CN102215060A

CN102215060A - Configuration and indication method of relay sub-frames as well as method and system for realizing relay transmission

Info

Publication number: CN102215060A
Application number: CN2010101573905A
Authority: CN
Inventors: 吴栓栓; 毕峰; 夏树强; 梁枫; 袁明; 杨瑾
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-04-01
Filing date: 2010-04-01
Publication date: 2011-10-12

Abstract

The invention provides a configuration and indication method of relay sub-frames as well as a method and system for realizing relay transmission, wherein the methods and system provided by the invention are applied to a TDD (time division duplex) system comprising at least one base station and a relay station. The configuration method comprises the following steps: aiming at uplink and downlink configurations on used sub-frames, creating one or more relay sub-frame configuration sets for carrying out uplink and downlink communications between the base station and the relay station; and forming a sub-frame combination by an uplink sub-frame and each downlink sub-frame in the same relay sub-frame configuration set, wherein the sub-frame combination is one of combinations of uplink sub-frames and downlink sub-frames for downlink service transmission and corresponding uplink ACK (acknowledgement)/NACK (negative acknowledgement) feedback information transmission under the uplink and downlink configuration of the sub-frames defined in TDD LTE (long term evolution) Release-8. The invention also provides a corresponding indication method as well as a method and system for realizing the relay transmission. The relay station is used in the system, thus ensuring the backward compatibility for terminals.

Description

Configuration and indication method of relay subframe, method and system for realizing relay transmission

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method for configuring and indicating a relay subframe, and a method and a system for implementing relay transmission.

Background

Currently, the development of mobile communication requires that higher transmission rate, more perfect signal coverage and higher resource utilization can be supported. To achieve higher transmission rate, the next generation mobile communication system will use a higher frequency bandwidth to transmit signals, and the higher frequency bandwidth will bring larger path loss and affect the network coverage. Relay (Relay) technology can increase coverage and balance and increase cell throughput, and a Relay station has relatively low configuration cost compared to a base station, so that Relay is regarded as a key technology in an evolved system of Long Term Evolution (Long Term Evolution, abbreviated as LTE), namely an Advanced Long Term Evolution (LTE-Advanced, abbreviated as LTE-a) system.

In a Time Division Duplex (TDD) LTE system, uplink and downlink share the same frequency resource, and the frequency resource is divided in Time by frame. Fig. 1 is a diagram of a frame structure of a TDD system according to the related art. As shown in fig. 1, each radio frame has a length of 10 ms and includes 10 subframes having a length of 1 ms, where the subframes include an uplink subframe, a downlink subframe, and a special subframe. According to different proportions of the number of uplink/downlink subframes, the TDD LTE system has 7 uplink and downlink configurations of the subframe, and the system can flexibly configure according to information such as uplink/downlink service volume in a cell. The specific uplink and downlink configuration structure of the 7 subframes is shown in table 1, where D denotes a downlink subframe, U denotes an uplink subframe, and S denotes a special subframe.

TABLE 1 uplink and downlink configuration form of subframe in TDD LTE system

Fig. 2 is a schematic diagram of a special subframe structure of a TDD system according to the related art, where, as shown in fig. 2, an S subframe includes a part of Downlink symbols (DwPTS for short), Uplink symbols (UpPTS for short), and Guard intervals (GP for short) for switching between Uplink and Downlink. As an evolved system of TDD LTE that ensures backward compatibility, a TDD LTE-a system may maintain the same frame structure as TDD LTE.

In the TDD LTE system, certain time sequence relation is satisfied between service transmission and corresponding ACK/NACK feedback information transmission. For example, for the transmission of downlink traffic and corresponding uplink ACK/NACK feedback information, in the n-k downlink subframe, the base station sends downlink traffic, and in the n-k uplink subframe, a User Equipment (User Equipment, abbreviated as UE, also referred to as terminal) feeds back corresponding acknowledgement/Negative acknowledgement (ACK/NACK) information to the base station according to received data. Wherein, k is different according to the uplink and downlink configuration of the subframe and the position of the subframe of the TDD system, which is specifically shown in table 2.

TABLE 2 uplink ACK/NACK feedback transmission timing k-value table for downlink service in TDD LTE system

Similarly, a corresponding transmission timing relationship is defined between the uplink service of the LTE system and the corresponding downlink ACK/NACK feedback information. In the n-k uplink sub-frame, the user equipment sends uplink service to the base station, and in the n downlink sub-frame, the base station feeds back corresponding ACK/NACK information to the user equipment according to the received data, and the definition of the k value is shown in Table 3.

TABLE 3 Downlink ACK/NACK feedback transmission timing k-value table for uplink service in TDD LTE system

In the TDD LTE system, there is also a strict timing relationship between uplink grant (UL grant) information transmission and corresponding uplink traffic transmission. And in the subframe of number n, the base station transmits uplink authorization information in a downlink mode, and in the subframe of number n + k, the terminal transmits corresponding uplink service according to the uplink authorization information. The transmission timing k of the uplink grant information and the uplink traffic defined in Rel-8 is shown in table 4.

Table 4 table of uplink grant information and uplink service transmission timing k value in TDD LTE system

After the introduction of the relay station, the data transmission is equivalent to one more hop. Taking a two-hop transmission system as an example, an original base station-terminal communication mode is changed into a base station-relay station-terminal communication mode, where a base station-relay station link is called a relay link or a backhaul link (backhaul link), an interface between a corresponding base station and a corresponding relay station is called a Un interface, a relay station-terminal link is called an access link (access link), an interface between a corresponding relay station and a corresponding terminal is called a Uu interface, and a base station-terminal link is called a direct link (direct link). In the multi-hop system, a part of terminals are accessed to the relay station, and communication service is completed through the relay station.

After the LTE-a system introduces the relay station, it needs to ensure backward compatibility for the terminal, that is, it is ensured that the terminal of the previous version (for example, LTE Release-8, Rel-8 for short) can also access to the relay station, and at this time, it needs to partition a part of resources to ensure the communication between the base station and the relay station on the premise of not affecting the communication between the relay station and the subordinate terminal. The current LTE-a system determines that base station-relay station communication and relay station-terminal communication are performed in a time division manner. Specifically, a part of subframes are divided into uplink and downlink subframes for relay link data transmission, and these relay link uplink and downlink data transmission subframes are called relay (or backhaul) subframes or Un subframes. For a Rel-8 terminal under a relay station, a downlink backhaul subframe is indicated as a Multicast Broadcast Single Frequency Network (MBSFN) subframe, so that the Rel-8 terminal can skip the subframes, and backward compatibility for the Rel-8 terminal is ensured while base station-relay station communication is completed. For the uplink backhaul subframes, the terminal is not scheduled, so that the terminal is prevented from performing uplink service transmission on the subframes, and the communication between the relay station and the base station is completed.

On the other hand, in the TDD LTE protocol, there is a strict correspondence relationship between the service and the transmission timing of the corresponding ACK/NACK feedback information, and the compatibility with the Rel-8 terminal means that the service transmission of the terminal under the relay station and the transmission timing of the ACK/NACK feedback information must be guaranteed to follow the definition of the Rel-8 protocol. Because the downlink backhaul subframe adopts the structure of the MBSFN subframe, the relay station can send downlink ACK/NACK feedback, uplink authorization and other information to the subordinate terminal on the time-frequency resource of the control domain of the MBSFN subframe. However, due to the structure of the uplink backhaul subframe itself, the relay station is in a transmitting state in the uplink backhaul subframe and cannot receive uplink ACK/NACK feedback information sent by the subordinate terminal, so that the transmission timing of the downlink service and the corresponding uplink ACK/NACK feedback information has an important influence on the configuration of the backhaul subframe. In addition, in the TDD system, it is specified that downlink subframes except subframes 0, 1, 5, and 6 may be configured as MBSFN subframes, and uplink subframes themselves are fewer in uplink and downlink configurations of some subframes, so it is difficult to ensure that the configuration of the uplink backhaul subframes does not affect the transmission of the access link downlink service and corresponding uplink ACK/NACK feedback information. The above problem causes backhaul subframe configuration in the TDD system to be more complicated.

In summary, after the TDD LTE-a system or other systems introduce the relay station, how to perform backhaul subframe configuration ensures that the implementation is simple and the signaling overhead is kept within a reasonable range, which becomes an important problem in the TDD LTE-a system.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a method for configuring, configuring and indicating a relay subframe, and a method and a system for implementing relay transmission, which are used in a TDD system such as an LTE-a system, and ensure backward compatibility with a terminal after a relay station is introduced into the system.

In order to solve the above problem, the present invention provides a first relay subframe configuration method for a Time Division Duplex (TDD) system including at least a base station and a relay station, including:

and for each downlink subframe in the relay subframe configuration set, an uplink subframe and the downlink subframe form a subframe combination in the same relay subframe configuration set, and the subframe combination is one of the combinations of the uplink subframe and the downlink subframe for downlink service transmission and corresponding uplink ACK/NACK feedback information transmission under the subframe uplink and downlink configuration defined in TDD LTE Release-8.

Further, the air conditioner is provided with a fan,

and the subframe combination in the relay subframe configuration set is one of the combinations of the uplink subframe and the downlink subframe for uplink service transmission and corresponding downlink ACK/NACK feedback information transmission and/or one of the combinations of the uplink subframe and the downlink subframe for uplink authorization information transmission and corresponding uplink service transmission under the subframe uplink and downlink configuration defined in TDD LTE Release-8.

Further, the air conditioner is provided with a fan,

the relay subframe configuration set is only used for a subframe uplink and downlink configuration structure containing at least 2 uplink subframes in one radio frame, the subframes in the relay subframe configuration set are subsets of a subframe set {2, 3, 4, 7, 8, 9}, and numbers in the { }' represent subframe numbers of the subframes contained in the relay subframe configuration set in the radio frame;

for the subframe uplink and downlink configuration, when the relay subframe configuration sets are multiple, different relay subframe configuration sets do not have the same subframe, or at least one relay subframe configuration set is a subset of another relay subframe configuration set.

Further, the air conditioner is provided with a fan,

the used subframe uplink and downlink configuration comprises subframe uplink and downlink configuration 1, and the correspondingly constructed relay subframe configuration set is one or more of the following subframe sets: {4, 8}, {3, 9} and {3, 4, 8, 9 }.

Further, the air conditioner is provided with a fan,

the used subframe uplink and downlink configuration comprises subframe uplink and downlink configuration 2, and the correspondingly constructed relay subframe configuration set is one or more of the following subframe sets: {3, 7, 9} and {3, 7}, or one or more of the following sets of subframes: {2, 4, 8} and {2, 8 }.

Further, the air conditioner is provided with a fan,

the used subframe uplink and downlink configuration comprises subframe uplink and downlink configuration 3, and the correspondingly constructed relay subframe configuration set is one or more of the following subframe sets: {3, 7}, {3, 8}, {3, 7, 8}, {4, 9} and {3, 4, 7, 8, 9 }.

Further, the air conditioner is provided with a fan,

the used subframe uplink and downlink configuration comprises subframe uplink and downlink configuration 4, and the constructed relay subframe configuration set is one or more of the following subframe sets: {3, 9}, {3, 8, 9}, {3, 7, 9} and {3, 7, 8, 9 }.

Further, the air conditioner is provided with a fan,

the used subframe uplink and downlink configuration comprises subframe uplink and downlink configuration 6, and the correspondingly constructed relay subframe configuration set is {4, 9 }.

Further, the air conditioner is provided with a fan,

the used subframe uplink and downlink configuration comprises subframe uplink and downlink configuration 0, and the correspondingly constructed relay subframe configuration set is one or more of the following subframe sets: {1, 7}, {2, 6}, and {1, 2, 6, 7}, wherein the number in "{ }" denotes the subframe number in the radio frame of the subframe contained in the relay subframe configuration set.

Further, the air conditioner is provided with a fan,

and configuring the constructed relay subframe configuration set on a base station, when configuring the relay subframe, taking out part or all of the configured relay subframe configuration sets corresponding to the uplink and downlink configuration of the current subframe by the base station, and configuring the subframes in the part or all of the relay subframe configuration sets as the relay subframes used for relay link transmission under the uplink and downlink configuration of the current subframe.

In order to solve the above problem, the present invention further provides a method for configuring and indicating a relay subframe, which is used in a Time Division Duplex (TDD) system including at least a base station and a relay station, and includes:

according to the first relay subframe configuration method, the base station determines the subframes in the partial or all relay subframe configuration sets as the relay subframes used for relay link transmission under the uplink and downlink configuration of the current subframe;

the base station sends an indication signaling to the relay station and indicates the part or all of the relay subframe configuration set to the relay station; the relay station acquires the part or all of the relay subframe configuration set according to the indication signaling, and determines the subframes in the part or all of the relay subframe configuration set as relay subframes for relay link transmission.

Further on

And the base station uses different binary sequences as indexes of different relay subframe configuration set groups, and indicates the extracted part or all of the relay subframe configuration sets by transmitting the binary sequences corresponding to the relay subframe configuration set groups formed by the part or all of the relay subframe configuration sets to the relay station.

Further on

And the base station determines the number of the required uplink and downlink relay subframes according to the traffic, and the number of the subframes in the configuration set of the part or all of the relay subframes, which is taken out, meets the number requirement.

Further on

The length of the binary sequence is the same under different subframe uplink and downlink configurations, namely

Wherein N is_max ^subframe-setA maximum value representing the number of relay subframe configuration sets in each subframe uplink and downlink configuration,

represents rounding up; or, the length of the binary sequence is the same under different subframe uplink and downlink configurations, namelyWherein N is_max ^subframe-setA maximum value representing the number of relay subframe configuration sets in each subframe uplink and downlink configuration,

represents rounding up; or

The length of the binary sequence is

Wherein i is the serial number of the uplink and downlink configuration of the subframe, N_i ^subframe-setIndicates the number of relay subframe configuration sets in the subframe uplink and downlink configuration i,

represents rounding up, i is greater than or equal to 0 and less than or equal to 6; or, the length of the binary sequence isWherein i is the serial number of the uplink and downlink configuration of the subframe, N_i ^subframe-setIndicates the number of relay subframe configuration sets in the subframe uplink and downlink configuration i,meaning rounding up, i is 0 or more and 6 or less.

In order to solve the above technical problem, the present invention further provides a second relay subframe configuration method for a Time Division Duplex (TDD) system including at least a base station and a relay station, including:

aiming at the uplink and downlink configuration of the current subframe, the base station configuration and/or the relay station acquires the configured downlink relay subframe for downlink communication between the base station and the relay station;

and for each downlink relay subframe, the base station and/or the relay station finds an uplink subframe which forms a defined subframe combination with the downlink relay subframe and determines the uplink subframe as an uplink relay subframe corresponding to the downlink relay subframe, wherein the defined subframe combination refers to the combination of the uplink subframe and the downlink subframe for downlink service transmission and corresponding uplink ACK/NACK feedback information transmission under the uplink and downlink configuration of the subframe defined in TDD LTE Release-8.

Further, the base station and/or the relay station determines an uplink relay subframe for each downlink relay subframe according to the following mode:

a base station and/or a relay station determines an uplink subframe of a subframe n as a corresponding uplink relay subframe for a downlink relay subframe of the subframe n-k, uplink ACK/NACK feedback information transmitted by downlink service on the downlink relay subframe of the subframe n-k is transmitted on the uplink relay subframe of the subframe n, and the value of k enables the transmission time sequence to accord with the transmission time sequence of the downlink service and the corresponding uplink ACK/NACK feedback information defined by TDD LTE Release-8; or

And the base station and/or the relay station determines the uplink subframe of the subframe n + k 'as the corresponding uplink relay subframe for the downlink relay subframe of the subframe n, the uplink ACK/NACK feedback information transmitted by the downlink service on the downlink relay subframe of the subframe n is transmitted on the uplink relay subframe of the subframe n + k', and the value of k ensures that the transmission time sequence conforms to the transmission time sequence of the downlink service and the corresponding uplink ACK/NACK feedback information defined by TDD LTE Release-8.

Further, the air conditioner is provided with a fan,

the base station and/or the relay station is configured with a time sequence relation and a value taking table of a downlink relay subframe and an uplink relay subframe, when the downlink subframe of the subframe n is configured as the downlink relay subframe, the uplink subframe of the subframe n +1 is determined as the corresponding uplink relay subframe by searching the time sequence relation and the value taking table, and the time sequence and the value of uplink and downlink configuration of the following subframes in the time sequence relation and the value taking table are as follows:

subframe uplink and downlink configuration 1, wherein one or more of subframes 4 and 9 can be configured as downlink relay subframes, and the corresponding value of 1 is 4 or 4;

subframe uplink and downlink configuration 2, wherein one or more of subframes 3, 4, 8 and 9 can be configured as downlink relay subframes, and corresponding 1 values are 4, 8, 4 and 8 in sequence;

subframe uplink and downlink configuration 3, wherein one or more of subframes 7, 8 and 9 can be configured as downlink relay subframes, and corresponding 1 values are 6, 5 and 5 in sequence;

subframe uplink and downlink configuration 4, wherein one or more of subframes 4, 7, 8 and 9 can be configured as downlink relay subframes, and corresponding 1 values are 8, 6, 5 and 4 in sequence;

subframe uplink and downlink configuration 6, subframe 9 can be configured as a downlink relay subframe, and the corresponding value of 1 is 5.

Further, the current subframe uplink and downlink configuration is one or more of the following subframe uplink and downlink configurations, and the downlink relay subframe and the uplink relay subframe configured correspondingly are as follows:

subframe uplink and downlink configuration 1, subframe 4 is configured as a downlink relay subframe, and the corresponding uplink relay subframe is subframe 8; or, the subframe 9 is configured as a downlink relay subframe, and the corresponding uplink relay subframe is the subframe 3; subframes 4 and 9 are configured as downlink relay subframes, and corresponding uplink relay subframes are subframes 8 and 3;

subframe uplink and downlink configuration 2, subframe 3 and/or 9 are configured as downlink relay subframes, and the corresponding uplink relay subframe is subframe 7; or, the subframe 4 and/or 8 is configured as a downlink relay subframe, and the corresponding uplink relay subframe is subframe 2;

subframe uplink and downlink configuration 3, subframes 7 and/or 8 are configured as downlink relay subframes, and the corresponding uplink relay subframe is subframe 3; or, the subframe 9 is configured as a downlink relay subframe, and the corresponding uplink relay subframe is subframe 4; or at least one subframe of the subframes 7 and 8 and the subframe 9 are configured as downlink relay subframes, and the corresponding uplink relay subframes are the subframes 3 and 4;

subframe uplink and downlink configuration 4, at least one of subframes 7, 8 and 9 is configured as a downlink relay subframe, and the corresponding uplink relay subframe is a subframe 3; or, the subframe 4 is configured as a downlink relay subframe, and the corresponding uplink relay subframe is the subframe 2;

and the subframe is configured to be a downlink subframe 6, the subframe 9 is configured to be a downlink relay subframe, and the corresponding uplink relay subframe is the subframe 4.

In order to solve the above technical problem, the present invention further provides a second method for configuring and indicating a relay subframe, which is used in a Time Division Duplex (TDD) system including at least a base station and a relay station, and includes:

the base station sends an indication signaling to the relay station to indicate the configured downlink relay subframe used for downlink communication between the base station and the relay station;

and the relay station acquires the configured downlink relay subframe from the indication signaling and then determines a corresponding uplink relay subframe according to the second relay subframe configuration method.

Further, the air conditioner is provided with a fan,

the base station indicates the configured downlink relay subframe to the relay station through a bitmap in the indication signaling;

the length of the bitmap is 5 or 6 bits, wherein 5 bits respectively correspond to subframes 3, 4, 7, 8 and 9 in a radio frame and are used for indicating the position of a downlink relay subframe in 1 radio frame; or

The length of the bitmap is 20 or 24 bits, and the bitmap includes 4 bits of 5 or 6 bits, and 5 bits of each bit of 5 or 6 bits correspond to subframes 3, 4, 7, 8, and 9 in a radio frame, respectively, and are used for indicating the positions of downlink relay subframes in 4 radio frames.

Further, the air conditioner is provided with a fan,

the base station configures an uplink relay subframe and a downlink relay subframe for relay link transmission according to the relay subframe configuration method of claim 10.

Further, the air conditioner is provided with a fan,

the base station selects one or more subframes to be configured as downlink relay subframes aiming at the uplink and downlink configuration of the current subframe, and then determines the corresponding uplink relay subframes according to the second relay subframe configuration method; wherein:

configuring 1 for uplink and downlink of the subframe, and configuring one or more of subframes 4 and 9 as downlink relay subframes;

configuring subframe uplink and downlink 2, and configuring one or more of subframes 3, 4, 8 and 9 as downlink relay subframes;

configuring 3 subframe uplink and downlink, and configuring one or more of subframes 7, 8 and 9 as downlink relay subframes;

configuring 4 for uplink and downlink of the subframe, and configuring one or more of subframes 4, 7, 8 and 9 as downlink relay subframes;

and configuring 6 the uplink and the downlink of the subframe, and configuring 9 the subframe as a downlink relay subframe.

In order to solve the above technical problem, the present invention further provides a method for implementing relay transmission, which is used in a Time Division Duplex (TDD) system including at least a base station and a relay station, and includes:

a base station determines a relay subframe group formed by relay subframes used for relay link transmission under the uplink and downlink configuration of a current subframe and informs a relay station, and for each downlink subframe in the relay subframe group, the relay subframe group comprises a combination of an uplink subframe and a downlink subframe which are used for downlink service transmission and corresponding uplink ACK/NACK feedback information transmission under the uplink and downlink configuration of the subframe defined in TDD LTE Release-8 formed by an uplink subframe and the downlink subframe;

and when the relay subframe group is used for uplink and downlink communication between the base station and the relay station, the downlink service and the corresponding uplink ACK/NACK feedback information are transmitted according to the transmission time sequence of the downlink service and the corresponding uplink ACK/NACK feedback information defined in TDD LTE Release-8.

Further, the air conditioner is provided with a fan,

for each uplink subframe in the relay subframe group, if a downlink subframe and the uplink subframe in the relay subframe group form a combination of the uplink subframe and the downlink subframe which are used for uplink service transmission and corresponding downlink ACK/NACK feedback information transmission under the uplink and downlink configuration of the subframe and defined in TDD LTE Release-8, the base station and the relay station use the transmission time sequence of the uplink service and the corresponding downlink ACK/NACK feedback information defined in TDD LTE Release-8 to transmit the uplink service and the corresponding downlink ACK/NACK feedback information; otherwise, defining a downlink subframe in the relay subframe group for transmitting downlink ACK/NACK feedback information corresponding to the uplink service transmission on the uplink subframe, and the base station and the relay station transmit the uplink service and the corresponding downlink ACK/NACK feedback information by using the newly defined transmission time sequence of the uplink service and the corresponding downlink ACK/NACK feedback information.

Further, the air conditioner is provided with a fan,

for each uplink subframe in the relay subframe group, if a downlink subframe and the uplink subframe in the relay subframe group form a combination of the uplink subframe and the downlink subframe which are used for uplink authorization information transmission and corresponding uplink service transmission under the subframe uplink and downlink configuration defined in TDD LTE Release-8, the base station and the relay station use the uplink authorization information defined in TDD LTE Release-8 and the transmission time sequence of the corresponding uplink service to transmit the uplink authorization information and the corresponding uplink service; otherwise, defining a downlink subframe in the relay subframe group for transmitting uplink authorization information corresponding to uplink service transmission on the uplink subframe, and using the newly defined uplink authorization information and the transmission time sequence of the corresponding uplink service by the base station and the relay station to transmit the uplink authorization information and the corresponding uplink service.

Further, the air conditioner is provided with a fan,

and the relay station indicates a downlink subframe in the relay subframe to a Rel-8 terminal as a Multicast Broadcast Single Frequency Network (MBSFN) subframe, and when the downlink subframe needs to send uplink authorization information and/or downlink ACK/NACK feedback information of uplink service, the relay station sends the uplink authorization information and/or the downlink ACK/NACK feedback information of the uplink service on a time-frequency resource of the downlink subframe corresponding to a control domain in the MBSFN subframe.

Further, the air conditioner is provided with a fan,

the base station and the relay station may determine the relay subframe used for relay link transmission under the uplink and downlink configuration of the current subframe according to the first or second relay subframe configuration and indication method.

In order to solve the above technical problem, the present invention provides a Time Division Duplex (TDD) system, comprising at least one base station and a relay station, wherein:

the base station includes:

a first relay subframe determining module, configured to determine a relay subframe group formed by relay subframes used for relay link transmission under current uplink and downlink configurations of subframes, where, for each downlink subframe in the relay subframe group, the relay subframe group has a combination of an uplink subframe and a downlink subframe, which are used for downlink service transmission and corresponding uplink ACK/NACK feedback information transmission under the uplink and downlink configurations of the subframe defined in TDD LTE Release-8 formed by the uplink subframe and the downlink subframe;

the indication module is used for sending an indication signaling and indicating the determined information of the relay subframe to the relay station;

the first communication module is used for carrying out uplink and downlink communication with the relay station by using the relay subframe;

the relay station includes:

a second relay subframe determining module, configured to determine a relay subframe used for relay link transmission according to the indication signaling;

the second communication module is used for carrying out uplink and downlink communication between the relay subframe and the base station;

and the first communication module and the second communication module transmit downlink services and corresponding uplink ACK/NACK feedback information according to the transmission time sequence of the downlink services and the corresponding uplink ACK/NACK feedback information defined in TDD LTE Release-8.

Further, the air conditioner is provided with a fan,

and the first relay subframe determining module completes the configuration of uplink and downlink relay subframes for relay link transmission on the base station according to the first or second relay subframe configuration method.

Further, the air conditioner is provided with a fan,

the indicating module indicates the part or all of the relay subframe configuration set to the relay station according to the indicating method of the first relay subframe configuration; the second relay subframe determining module acquires the configuration set of part or all relay subframes according to the indication signaling and determines the subframes in the configuration set as the relay subframes for relay link transmission; or

The indicating module indicates the configured information of the downlink relay subframe to the relay station according to the indicating method of the second relay subframe configuration; and the second relay subframe determines the configured downlink relay subframe according to the indication and determines the corresponding uplink relay subframe according to the second relay subframe configuration method.

Further, the air conditioner is provided with a fan,

and the first communication module and the second communication module transmit uplink service and corresponding downlink ACK/NACK feedback information and transmit uplink authorization information and corresponding uplink service according to the method for realizing relay transmission.

According to the configuration method, the configuration and indication method of the relay subframe, the method and the system for realizing relay transmission, after the relay station is introduced into the system, backward compatibility of the Rel _8 terminal can be ensured.

Drawings

Fig. 1 is a schematic diagram of a radio frame structure of an LTE system;

FIG. 2 is a diagram of a special subframe structure of a TDD LTE system;

FIG. 3 is a flowchart of the second embodiment.

Detailed Description

Aiming at different subframe uplink and downlink configurations in a TDD LTE system, the invention configures relay subframes (backhaul subframes or Un subframes) according to the transmission time sequence of downlink services and corresponding uplink ACK/NACK feedback information, and the transmission time sequence of the downlink services between the configured backhaul subframes and the corresponding uplink ACK/NACK feedback information is the same as the rule defined in a TDD LTE Release-8 protocol. Under the configuration principle, if the transmission time sequence of the uplink service and the corresponding downlink ACK/NACK feedback information between the configured backhaul subframes can not be completed according to the rule defined in the Rel-8 protocol, defining a new transmission time sequence of the uplink service and the corresponding downlink ACK/NACK feedback information between the backhaul subframes; and if the uplink authorization information between the configured backhaul subframes and the transmission time sequence of the corresponding uplink service cannot be completed according to the rule defined by the Rel-8 protocol, defining new uplink authorization information and the transmission time sequence of the corresponding uplink service between the backhaul subframes.

The first embodiment is as follows: constructing a backhaul subframe configuration set

According to the scheme, a backhaul subframe configuration set is respectively constructed for different uplink and downlink configurations of subframes in a TDD system, and the transmission time sequence of downlink services transmitted on the backhaul subframes in the backhaul subframe configuration set and the transmission time sequence of corresponding uplink ACK/NACK feedback information are the same as the rule defined by Rel-8. Because of the uplink backhaul subframe, the relay station cannot receive any uplink transmission of the subordinate terminal. The backhaul subframe configuration has little influence on the transmission timing of feedback information of backhaul and access links.

The construction method of the backhaul subframe configuration set comprises the following steps: and for each downlink subframe in the relay subframe configuration set, an uplink subframe and the downlink subframe form a subframe combination in the same relay subframe configuration set, and the subframe combination is one of the combinations of the uplink subframe and the downlink subframe for downlink service transmission and corresponding uplink ACK/NACK feedback information transmission under the subframe uplink and downlink configuration defined in TDD LTE Release-8. .

Further, the subframe combination in the relay subframe configuration set may also be one of a combination of an uplink subframe and a downlink subframe used for uplink service transmission and corresponding downlink ACK/NACK feedback information transmission, and/or one of a combination of an uplink subframe and a downlink subframe used for uplink grant information transmission and corresponding uplink service transmission, under the subframe uplink and downlink configuration defined in TDD lte early-8.

The relay subframe configuration set may be configured only for uplink and downlink of a subframe including at least 2 uplink subframes in one radio frame, but is not limited thereto.

The subframes in the relay subframe configuration set may be defined as a subset of a subframe set {2, 3, 4, 7, 8, 9}, and each downlink relay subframe may be indicated as an MBSFN subframe. The number in "{ }" indicates the subframe number of the subframe included in the relay subframe configuration set.

And configuring the constructed relay subframe configuration set on a base station, when a relay subframe needs to be configured, taking out a part or all of the configured relay subframe configuration sets corresponding to the uplink and downlink configuration of the current subframe by the base station, and configuring the subframes in the part or all of the relay subframe configuration sets as relay subframes used for relay link transmission under the uplink and downlink configuration of the subframe.

The base station may indicate the relay station to relay the part or all of the relay subframes through indication signaling, and a specific method is described below.

When the relay sub-frame is used for uplink and downlink communication between the base station and the relay station, the downlink service and the corresponding uplink ACK/NACK feedback information are transmitted according to the transmission time sequence of the downlink service and the corresponding uplink ACK/NACK feedback information defined in TDD LTE (time division Duplex) area-8.

For each uplink subframe in the relay subframe, if one of the combinations of the uplink subframe and the downlink subframe for uplink service transmission and corresponding downlink ACK/NACK feedback information transmission under the condition that the downlink subframe and the uplink subframe form uplink and downlink configuration of a subframe defined in TDD LTE Release-8 exists in the relay subframe, the base station and the relay station use the transmission time sequence of the uplink service and the corresponding downlink ACK/NACK feedback information defined in TDD LTE Release-8 to transmit the uplink service and the corresponding downlink ACK/NACK feedback information; otherwise, defining a downlink subframe in the relay subframe for transmitting downlink ACK/NACK feedback information corresponding to the uplink service transmission on the uplink subframe, and transmitting the uplink service and the corresponding downlink ACK/NACK feedback information by the base station and the relay station by using the newly defined transmission time sequence of the uplink service and the corresponding downlink ACK/NACK feedback information.

For each uplink subframe in the relay subframe, if one of the combinations of the uplink subframe and the downlink subframe for uplink authorization information transmission and corresponding uplink service transmission under the condition that the downlink subframe and the uplink subframe form uplink and downlink configuration of the subframe defined in the TDD LTE Release-8 exists in the relay subframe, the uplink authorization information defined in the TDD LTE Release-8 and the transmission time sequence of the corresponding uplink service are used between the base station and the relay station to transmit the uplink authorization information and the corresponding uplink service; otherwise, defining a downlink subframe in the relay subframe for transmitting uplink authorization information corresponding to the uplink service transmission on the uplink subframe, and using the newly defined uplink authorization information and the transmission time sequence of the corresponding uplink service by the base station and the relay station to transmit the uplink authorization information and the corresponding uplink service.

And the relay station indicates a downlink subframe in the relay subframe to a Rel-8 terminal as a Multicast Broadcast Single Frequency Network (MBSFN) subframe, and when the relay station needs to send uplink authorization information and/or downlink ACK/NACK feedback information of uplink service on the downlink subframe, the relay station sends the uplink authorization information and/or the downlink ACK/NACK feedback information of the uplink service on a time-frequency resource of the downlink subframe corresponding to a control domain in the MBSFN subframe. The second embodiment can also deal with this.

The following is specifically described with reference to the uplink and downlink configuration of each subframe in table 1.

Subframe uplink and downlink configuration 0:

under the subframe uplink and downlink configuration, except for the subframe {0, 1, 5, 6}, no downlink subframe can be used for downlink backhaul transmission. Therefore, there can be two options under the uplink and downlink configuration of the subframe: relay transmission is not supported, or downlink backhaul transmission is performed in a special subframe (S subframe).

It is assumed that downlink backhaul transmission is supported in the S subframe. For S subframe 1, the uplink ACK/NACK feedback information of the downlink traffic is transmitted in subframe 7, the downlink ACK/NACK feedback information of the uplink traffic on subframe 7 is transmitted in subframe 1, and the uplink grant information of subframe 7 is sent in subframe 1. And the {1, 7} is configured as a backhaul subframe, the uplink feedback information of the terminal without downlink service needs to be transmitted on the subframe 7, and the service transmission and the ACK/NACK feedback information transmission of the terminal on other subframes are not influenced. Similarly, the S subframe 6 and the uplink subframe 2 have such a transmission timing relationship.

Specifically, the backhaul subframe configuration set may be constructed in the following manner:

in the method 1, according to the transmission timing relationship between the service transmission and the ACK/NACK feedback information, two backhaul subframe configuration sets are constructed under the uplink and downlink configuration of the subframe: a backhaul subframe configuration set {1, 7} and a backhaul subframe configuration set {2, 6 }. The subframes in the two configuration sets do not intersect. The transmission timing of the traffic transmission and the corresponding ACK/NACK feedback information in the two configuration sets is the same as the rule defined by Rel-8.

{1, 7}, {2, 6} are all combinations of uplink subframes and downlink subframes defined in TDD LTE Release-8 for downlink traffic transmission and corresponding uplink ACK/NACK feedback information transmission.

In the mode 2, the backhaul subframe configuration set may be constructed in another mode, that is, when the backhaul subframe configuration set is greater than 1, the different backhaul subframe configuration sets are in a subset relationship. For the uplink and downlink configuration of the subframe, the following two backhaul subframe configuration sets can be constructed: the first set of backhaul subframe configurations is {1, 7} or {2, 6}, and the second set of backhaul subframe configurations is {1, 2, 6, 7 }. Similarly, the transmission timing of the traffic transmission and the feedback information in the two subframe configuration sets is the same as the rule defined by Rel-8.

Or, a configuration set of 3 backhaul subframes may also be constructed under the uplink and downlink configuration of the subframe: {1, 7}, {2, 6}, and {1, 2, 6, 7 }.

Subframe uplink and downlink configuration 1:

the subframe uplink and downlink configuration downlink subframe 4 and subframe 9 may be configured as a downlink backhaul subframe. For the subframe 4, the uplink ACK/NACK feedback information corresponding to the downlink service is transmitted in the uplink subframe 8, the uplink grant information of the uplink subframe 8 is transmitted in the subframe 4, and the downlink ACK/NACK feedback information corresponding to the uplink service of the uplink subframe 8 is transmitted in the subframe 4. Likewise, there is a relationship between subframes 3 and 9. {4, 8}, {3, 9} are all combinations of uplink subframes and downlink subframes defined in TDD LTE Release-8 for downlink traffic transmission and corresponding uplink ACK/NACK feedback information transmission. The uplink and downlink configurations of the subframes are not described one by one.

in the method 1, according to the transmission timing sequence of the service transmission and the ACK/NACK feedback information, two backhaul subframe configuration sets are constructed under uplink and downlink configuration of the subframe: a backhaul subframe configuration set {4, 8} and a backhaul subframe configuration set {3, 9 }. The subframes in the two configuration sets do not intersect. The transmission timing of the traffic transmission and the ACK/NACK feedback information in the two subframe configuration sets is the same as the rule defined by Rel-8.

Mode 2, the backhaul subframe configuration set may be constructed in another mode, that is, when the backhaul subframe configuration set is greater than 1, there is a subset relationship between different backhaul subframe configuration sets. For the uplink and downlink configuration of the subframe, the following two backhaul subframe configuration sets can be constructed: the first set of configurations is 4, 8 or 3, 9 and the second set of configurations is 3, 4, 8, 9. Similarly, the transmission timing of the traffic transmission and the ACK/NACK feedback information in the two subframe configuration sets is the same as the rule defined by Rel-8.

Or, 3 backhaul subframe configuration sets may also be defined under the subframe uplink and downlink configuration: {4, 8}, {3, 9}, and {3, 4, 8, 9 }.

Subframe uplink and downlink configuration 2:

the subframe uplink and downlink configuration downlink subframes 3, 4, 8, and 9 may be configured as downlink backhaul subframes, and subframes 2 and 7 may be configured as uplink backhaul subframes. Wherein, the uplink ACK/NACK feedback information corresponding to the downlink services of the subframes 3 and 9 is transmitted in the subframe 7, and the uplink ACK/NACK feedback information corresponding to the downlink services of the subframes 4 and 8 is transmitted in the subframe 2. Since the access link needs to be guaranteed to have uplink transmission subframes, only one of the uplink subframes 2 and 7 can be configured as an uplink backhaul subframe if backhaul uplink transmission is required. Specifically, the backhaul subframe configuration set may be constructed in the following manner:

in the method 1, if the subframe 7 is configured as an uplink backhaul subframe, since there is uplink ACK/NACK feedback information corresponding to downlink services of subframes 3 and 9 in the subframe 7, then 3 and 9 are configured as downlink backhaul subframes at the same time, and therefore, a backhaul subframe configuration set {3, 7, 9} may be defined under the uplink and downlink configuration of the subframe. Similarly, if subframe 2 is configured as an uplink backhaul subframe, and subframes 4 and 8 are simultaneously configured as downlink backhaul subframes, another backhaul subframe configuration set {2, 4, 8} may be defined. There is no intersection between the two backhaul subframe configuration sets. In the two backhaul subframe configuration sets, the transmission timing of the uplink service and the corresponding downlink ACK/NACK feedback, the uplink authorization information and the transmission timing of the corresponding uplink service are the same as the rule defined by Rel-8.

Under the subframe uplink and downlink configuration, since an uplink subframe is required for access uplink transmission, preferably, the backhaul subframe configuration set including subframes 7 and 2 cannot be configured as an uplink backhaul subframe at the same time. Therefore, the constructed backhaul subframe configuration set can only include one of {3, 7, 9} or {2, 4, 8 }.

In mode 2, a more flexible backhaul subframe configuration may also be employed. For example, on the basis of scheme 1, for the backhaul subframe configuration set {3, 7, 9}, when backhaul traffic is small or backhaul links do not need so many downlink subframes due to other reasons, a backhaul subframe configuration set {3, 7} may be further added. Similarly, for the backhaul subframe configuration set {2, 4, 8}, a backhaul subframe configuration set {2, 8} may be further defined. In the two added backhaul subframe configuration sets, the transmission timing of the uplink service and the corresponding downlink ACK/NACK feedback, the transmission timing of the uplink authorization information and the corresponding uplink service are all the same as the rule defined by Rel-8.

Preferably, the backhaul subframe configuration set including subframes 7 and 2 cannot be configured as an uplink backhaul subframe at the same time. Therefore, the backhaul subframe configuration set constructed in this manner includes only {3, 7, 9} and {3, 7} or includes only {2, 4, 8} and {2, 8 }.

Subframe uplink and downlink configuration 3:

under the uplink and downlink configuration of the subframe, subframes 7, 8, and 9 may be configured as downlink backhaul subframes, and subframes 2, 3, and 4 may be configured as uplink backhaul subframes. Since uplink transmission of the access link needs to be guaranteed, subframes 2, 3, and 4 cannot be configured as backhaul uplink subframes at the same time. For the subframe which can be configured to downlink backhaul transmission, the uplink ACK/NACK feedback information of downlink service transmission of subframes 7 and 8 is transmitted in subframe 3, and the uplink ACK/NACK feedback information of downlink service transmission of subframe 9 is transmitted in subframe 4. Uplink feedback needs to be performed on downlink transmissions of the subframes 1, 5, and 6 in the subframe 2, and the subframes 1, 5, and 6 cannot be configured as downlink backhaul subframes, so the subframe 2 is not configured as an uplink backhaul subframe. Specifically, the backhaul subframe configuration set may be constructed in the following manner:

in the method 1, when the subframe 3 is configured as an uplink backhaul, the subframes 7 and 8 are configured as downlink backhaul subframes according to the uplink feedback timing. This results in a set of configurations 3, 7, 8. The uplink feedback information of the downlink service transmission of the subframe 9 is transmitted in the subframe 4, so that another backhaul configuration set {9, 4} can be obtained. Since subframe 4 needs to feedback the downlink transmission of subframe 0 at the same time, subframe 3 is preferably configured as an uplink backhaul subframe.

In the backhaul subframe configuration set {3, 7, 8}, for an uplink subframe 3, there is no subframe combination used for uplink service transmission and corresponding downlink ACK/NACK feedback information transmission under the subframe uplink and downlink configuration defined in TDD LTE Release-8, which is formed by a downlink subframe and the uplink subframe 3, in the backhaul subframe configuration set {3, 7, 8}, i.e., the transmission timing of the backhaul uplink service and the corresponding downlink ACK/NACK feedback information cannot be completed according to the rule defined by Rel-8, and then a new transmission timing of the uplink service and the downlink ACK/NACK feedback information needs to be defined. It can be defined that the downlink ACK/NACK feedback information of the uplink traffic transmission of the subframe 3 is transmitted in the subframe 7 or 8. In addition, in the backhaul subframe configuration set, the transmission timing sequence of the uplink grant information and the corresponding uplink service cannot be completed according to the Rel-8 specification, and a new uplink grant information and a transmission timing sequence of the corresponding uplink service also need to be defined. Specifically, it may be defined that the uplink grant information for the uplink traffic transmission in subframe 3 is transmitted in subframe 7 or subframe 8.

In the backhaul subframe configuration set {4, 9}, the transmission timing sequence of the backhaul uplink service and the corresponding downlink ACK/NACK feedback information cannot be completed according to the Rel-8 specification, and a new transmission timing sequence of the uplink service and the downlink ACK/NACK feedback information needs to be defined. The downlink ACK/NACK feedback information for the uplink traffic transmission of subframe 4 may be transmitted in subframe 9. Similarly, the uplink grant information and the transmission timing sequence of the corresponding uplink service cannot be completed according to the Rel-8 specification, and a new uplink grant information and a transmission timing sequence of the corresponding uplink service need to be defined. The uplink grant information for the uplink traffic transmission of subframe 4 may be transmitted in subframe 9.

Mode 2, the following two backhaul subframe configuration sets may be constructed: the first set of backhaul subframe configurations is {3, 7, 8}, and the second set of backhaul subframe configurations is {3, 4, 7, 8, 9 }.

Similarly, in the backhaul subframe configuration set constructed in this manner, the transmission timing sequence of the uplink service and the corresponding downlink ACK/NACK feedback information, and the transmission timing sequence of the uplink grant information and the corresponding uplink service also need to be redefined, which is the same as the description in the above manner 1 and is not described again.

Further, a backhaul subframe configuration set with only 1 downlink subframe may also be defined. For example, only subframe 7 or subframe 8 is configured as a downlink backhaul subframe, and subframe 3 is configured as an uplink backhaul subframe, e.g., a backhaul subframe configuration set {3, 7} or {3, 8} may be added.

Subframe uplink and downlink configuration 4:

the configured lower subframes 4, 7, 8, and 9 may be configured as downlink backhaul subframes, and the subframes 2 and 3 may be configured as uplink backhaul subframes. Since uplink transmission of the access link needs to be guaranteed, subframes 2, 3 cannot be configured as backhaul uplink subframes at the same time. Wherein, the subframe 2 needs to perform uplink ACK/NACK feedback for downlink transmission of the subframes 1, 5, and 6, and the subframes 1, 5, and 6 cannot be configured as downlink backhaul subframes, so the subframe 2 is not configured as an uplink backhaul subframe. For the subframe which can be configured to downlink backhaul transmission, the uplink ACK/NACK feedback information of downlink traffic transmission of subframes 7, 8, and 9 is transmitted in subframe 3. Specifically, the backhaul subframe configuration set may be constructed in the following manner:

mode 1: and configuring the subframe 3 as an uplink backhaul subframe, and configuring the subframes 7, 8 and 9 as downlink backhaul subframes to obtain a backhaul subframe configuration set {3, 7, 8 and 9 }.

Mode 2: when backhaul traffic is low or backhaul subframes are not used as many for other reasons, another backhaul configuration set {3, 9} may be defined. That is, the following two backhaul subframe configuration sets can be constructed: the first set of configurations is 3, 9 and the second set of configurations is 3, 7, 8, 9.

In backhaul subframe configuration sets {3, 7, 8, 9} and {3, 9}, both the uplink and downlink feedback timing and the uplink grant timing can be completed according to the Rel-8 specification.

Mode 3: and further adding and defining 1 backhaul configuration set {3, 8, 9} or {3, 7, 9 }. Namely, the following backhaul subframe configuration set can be constructed: the first configuration set is {3, 9}, the second configuration set is {3, 8, 9} or {3, 7, 9}, and a backhaul subframe configuration set {3, 7, 8, 9} may be added.

Under the uplink and downlink configuration of the subframe, in all constructed backhaul subframe configuration sets, the transmission timing sequence of the uplink service and the corresponding downlink ACK/NACK feedback information, and the transmission timing sequence of the uplink authorization information and the corresponding uplink service can be completed according to the Rel-8 specification.

Subframe uplink and downlink configuration 5:

under the uplink and downlink configuration of the subframe, only 1 uplink subframe is provided, and if the uplink subframe is configured as an uplink backhaul subframe, no uplink subframe of an access link can be used. Therefore, a proper backhaul subframe configuration set cannot be constructed under the uplink and downlink configuration of the subframe.

Subframe uplink and downlink configuration 6:

under the subframe uplink and downlink configuration, only 1 downlink subframe 9 can be configured as a downlink backhaul subframe. The uplink ACK/NACK feedback information for subframe 9 downlink traffic transmission is transmitted in uplink subframe 4, thus constructing a backhaul subframe configuration set {4, 9 }. In the backhaul subframe configuration set {4, 9}, the transmission timing sequence of the uplink grant information and the corresponding uplink service can be completed according to the Rel-8 specification, but the transmission timing sequence of the uplink service transmission and the downlink ACK/NACK feedback information cannot be completed according to the Rel-8 specification, so that the downlink ACK/NACK feedback information transmission subframe of the uplink service transmission of subframe 4 can be defined as subframe 9.

After configuring the relay subframe for relay link transmission according to the above manner, the base station sends an indication signaling to the relay station, and indicates the part or all of the relay subframe configuration set to the relay station; the relay station acquires the part or all of the relay subframe configuration set according to the indication signaling, and configures the subframes in the part or all of the relay subframe configuration set into relay subframes for relay link transmission.

The base station may use different binary sequences as indexes of different relay subframe configuration set groups to indicate the extracted part or all of the relay subframe configuration sets by transmitting a binary sequence corresponding to a relay subframe configuration set group formed by the extracted part or all of the relay subframe configuration sets to the relay station.

The length of the binary sequence may be the same under different subframe uplink and downlink configurations, or determined according to the number of backhaul subframe configuration sets that can be supported under each subframe uplink and downlink configuration.

In one example, theThe length of the binary sequence is the same under different subframe uplink and downlink configurations, and the length of the binary sequence is

Wherein N is_max ^subframe-setA maximum value representing the number of relay subframe configuration sets in each subframe uplink and downlink configuration,indicating rounding up.

For example, assume that for 7 different subframe uplink and downlink configurations of the TDD system, the maximum number of defined backhaul subframe configuration sets is 3 (i.e., the number of backhaul subframe configuration sets defined in a certain subframe uplink and downlink configuration is 3, and the number of backhaul subframe configuration sets supported in other subframe uplink and downlink configurations is less than or equal to 3), that is, the number of backhaul subframe configuration sets is less than or equal to 3)

Then the length of the binary sequence is

I.e. 2 bits are used to indicate the used backhaul subframe configuration. For example, assuming that 3 backhaul subframe configuration sets {4, 8}, {3, 9} and {3, 4, 8, 9} are defined under the subframe uplink and downlink configuration 1, it may be defined that the backhaul subframe configuration set representing the current configuration is {4, 8} when the 2-bit sequence takes a value of 00, the backhaul subframe configuration set representing the current configuration is {3, 9} when the value of 01 indicates that the backhaul subframe configuration set of the current configuration is {3, 9}, and the backhaul subframe configuration set representing the current configuration is {3, 4, 8, 9} when the value of 10 is taken, and 11 remains unused. If a backhaul subframe configuration set is not defined under a certain subframe uplink and downlink configuration, the binary sequence bits are left unused or the binary sequence is not defined under the configuration.

In yet another example, the length of the binary sequence may also be

The meanings of the symbols are the same as those described above.Still assume that for 7 different subframe uplink and downlink configurations of the TDD system, the maximum number of backhaul subframe configuration sets defined is 3, i.e. the maximum number is 3

The length of the binary sequence is

I.e. using a 2-bit binary sequence to represent the used backhaul subframe configuration. For example, still assuming that 3 backhaul subframe configuration sets {4, 8}, {3, 9}, and {3, 4, 8, 9} are defined under the subframe uplink and downlink configuration 1, it may be defined that when the 2-bit sequence takes a value of 00, it indicates that no backhaul subframe is currently configured, and when the 2-bit sequence takes a value of 01, it indicates that the currently configured backhaul subframe configuration set is {4, 8}, and when the 2-bit sequence takes a value of 10, it indicates that the currently configured backhaul subframe configuration set is {3, 9}, and when the 2-bit sequence takes a value of 11, it indicates that the currently configured backhaul subframe configuration set is {3, 4, 8, 9 }. If the number of backhaul subframe configuration sets defined under a certain subframe uplink and downlink configuration is less than 3, the binary sequences are used in sequence according to the size, and the rest binary sequences are reserved and not used. Similarly, if a certain subframe uplink and downlink configuration does not support backhaul subframe configuration, the binary sequence can only take a value of 00, or the binary sequence is not defined in the subframe uplink and downlink configuration.

In yet another example, the binary sequence length may also be determined according to the number of backhaul subframe configuration sets that can be supported under uplink and downlink configurations of each subframe. For example, the binary sequence has a length of

Wherein i represents the number of backhaul subframe configuration sets under the subframe uplink and downlink configuration i,meaning rounding up, i is 0 or more and 6 or less. For example, assume that there are 2 backhaul subframe configuration sets defined under TDD system subframe uplink and downlink configuration 3: {3, 8} and {3, 7, 8}, then

The length of the binary sequence is

That is, a 1-bit binary sequence is used to indicate the backhaul subframe configuration that can be used in the uplink and downlink configuration of the subframe. For example, the 2 subframe configuration sets {3, 8} and {3, 7, 8} are represented, respectively, assuming that the 1-bit sequence takes 0 and 1 values. If the number of configuration sets that the binary sequence can represent is greater than the actual number of configuration sets, then the remaining binary sequence values remain unused. If the uplink and downlink configuration of a certain subframe does not support backhaul subframe configuration, the length of the binary index sequence is 0, that is, the binary index sequence is not used.

In yet another example, the length of the binary sequence may also be

The meanings of the symbols are the same as those described above. Still assuming that the number of backhaul subframe configuration sets defined under the TDD system subframe uplink and downlink configuration 3 is 2, which are {3, 8} and {3, 7, 8} respectively, then

The length of the binary sequence is

That is, 2 bits are used to indicate the backhaul subframe configuration that can be used under the uplink and downlink configuration of the subframe. For example, the 2-bit sequence may be defined to represent the 2 subframe configuration sets {3, 8} and {3, 7, 8} respectively when taking values of 01 and 10, a value of 00 indicates that a backhaul subframe is not configured, and a value of 11 remains unused. If the uplink and downlink configuration of a certain subframe does not support the backhaul subframe configuration set, the length of the binary index sequence is equal to 0, which indicates that there is no backhaul subframe configuration. When the uplink and downlink configuration of a certain subframe does not support the backhaul subframe configuration set, the length of the binary index sequence may also be defined as 0.

Example two:

the basic idea of the scheme is to configure downlink relay subframes under the uplink and downlink configurations of different subframes in a TDD system, determine corresponding uplink relay subframes according to the configured downlink backhaul subframes, and transmit corresponding uplink ACK/NACK feedback information of downlink service transmission on the downlink relay subframes on the uplink relay subframes. The method can be determined according to the transmission time sequence of the downlink service and the uplink ACK/NACK feedback information defined by the TDD LTE Release-8 protocol.

As shown in fig. 3, the method for indicating relay subframe configuration of this embodiment includes:

step 110, aiming at the current subframe uplink and downlink configuration, a base station configures a downlink relay subframe for downlink communication between the base station and a relay station;

step 120, the base station sends an indication signaling to the relay station to indicate the determined downlink relay subframe used for downlink communication between the base station and the relay station;

the indication signaling may indicate the configuration condition of the relay subframe in the radio frame in a bitmap manner, such as whether a certain subframe is configured as a downlink relay subframe, or configured as a subframe position of the downlink relay subframe.

For example, when the indication signaling indicates the downlink backhaul subframe configuration in each radio frame, a 6-bit bitmap may be used for indication. Specifically, bits 1 to 5 in the bitmap indicate whether downlink subframes in subframes 3, 4, 7, 8, and 9 are configured as downlink backhaul subframes (taking 1 indicates that the downlink subframes are configured as downlink backhaul subframes), and bit 6 is not used. If some subframes in 3, 4, 7, 8, and 9 under a certain subframe uplink and downlink configuration are uplink subframes, the corresponding bit can only take a value of 0. For example, for subframe uplink and downlink configuration 1, when the bitmap is 010010, it indicates that subframes 4 and 9 are configured as downlink backhaul subframes. Since the subframes 3, 7, and 8 are uplink subframes, the corresponding 1 st, 3 rd, and 4 th bits in the bitmap can only take the value of 0.

The length of the indication signaling may also be 24 bits, which indicates the backhaul subframe configuration of 4 consecutive radio frames. Specifically, the first 20 bits of the bitmap with a length of 24 bits sequentially indicate whether downlink subframes in subframes 3, 4, 7, 8, and 9 of consecutive 4 radio frames are configured as downlink backhaul subframes (a value of 1 indicates that the downlink backhaul subframes are configured), and the last 4 bits are unused. If some subframes in 3, 4, 7, 8, and 9 under a certain subframe uplink and downlink configuration are uplink subframes, the corresponding bit can only take a value of 0. For example, for the subframe uplink and downlink configuration 6, when the bitmap is 000010000000001000000000, the downlink subframe 9 representing the 1 st and 3 rd radio frames is configured as a downlink backhaul subframe.

Similar to the above, the length of the bitmap may also be 5 bits or 20 bits, that is, 1 bit and 4 bits that are not used for reservation in 6 bits and 24 bits of the bitmap are removed, and other definitions are the same as the lengths of the 6 bits and 24 bits, which is not described again.

Step 130, after receiving the indication signaling, the relay station determines, for each downlink relay subframe, an uplink subframe constituting a defined subframe combination with the downlink relay subframe and determines the uplink subframe as an uplink relay subframe.

The defined subframe combination refers to the combination of an uplink subframe and a downlink subframe for downlink service transmission and corresponding uplink ACK/NACK feedback information transmission under the uplink and downlink configuration of the subframe defined in TDD LTE Release-8.

In particular, the amount of the solvent to be used,

The time sequence relation in the table 2 is converted into a new expression mode. The time series relationship after the conversion is shown in table 5. Table 5 shows a k 'value table that satisfies the timing relationship of uplink feedback information transmitted by the n number downlink subframe service in the subframe transmission of the n + k' number.

TABLE 5 uplink ACK/NACK feedback timing k' value table for downlink service in TDD LTE system

The backhaul subframe configuration method according to this embodiment will be described in detail below with respect to uplink and downlink configurations of a TDD system 7 subframe.

Subframe uplink and downlink configuration 0:

for the subframe uplink and downlink configuration 0, no downlink subframe except the subframe {0, 1, 5, 6} can be used for downlink backhaul transmission, so the backhaul subframe configuration method of this embodiment is not supported under the subframe uplink and downlink configuration.

Subframe uplink and downlink configuration 1:

for subframe uplink and downlink configuration 1, subframes 4 and 9 may be configured as downlink backhaul subframes. And according to the downlink service defined by Rel-8 and the transmission time sequence of the corresponding uplink ACK/NACK feedback information, the uplink ACK/NACK feedback information transmitted by the downlink service of the subframes 4 and 9 is transmitted in the subframes 8 and 3 respectively. Therefore, if the subframe 4 is configured as a downlink backhaul subframe, according to the present scheme, the relay station determines the subframe 8 as an uplink backhaul subframe; if the subframe 9 is configured as a downlink backhaul subframe, the relay station determines that the subframe 3 is an uplink backhaul subframe.

Subframe uplink and downlink configuration 2:

for subframe uplink and downlink configuration 2, subframes 3, 4, 8, and 9 may be configured as downlink backhaul subframes. And according to the downlink service defined by Rel-8 and the transmission time sequence of the corresponding uplink ACK/NACK feedback information, the uplink ACK/NACK feedback information transmitted by the downlink service of the subframes 9 and 3 is transmitted in the subframe 7, and the uplink ACK/NACK feedback information transmitted by the downlink service of the subframes 4 and 8 is transmitted in the subframe 2. Therefore, if the subframe 9 and/or 3 is configured as a downlink backhaul subframe, according to the present scheme, the relay station determines the subframe 7 as an uplink backhaul subframe; if the subframes 4 and/or 8 are configured as downlink backhaul subframes, according to the present scheme, the relay station determines the subframe 2 as an uplink backhaul subframe. Preferably, subframes 9 and 3 and subframes 4 and 8 are not configured as downlink subframes at the same time.

Subframe uplink and downlink configuration 3:

for subframe uplink and downlink configuration 3, subframes 7, 8, and 9 may be configured as downlink backhaul subframes. And according to the downlink service defined by Rel-8 and the transmission time sequence of the corresponding uplink ACK/NACK feedback information, the uplink ACK/NACK feedback information transmitted by the downlink services of the subframes 7, 8 and 9 is respectively transmitted in the subframes 3, 3 and 4. Therefore, if the subframe 7 and/or 8 is configured as a downlink backhaul subframe, the relay station determines the subframe 3 as an uplink backhaul subframe according to the method of the present invention; and if the subframe 9 is configured as a downlink backhaul subframe, the relay station determines the subframe 4 as an uplink backhaul subframe.

Subframe uplink and downlink configuration 4:

for subframe uplink and downlink configuration 4, subframes 4, 7, 8, and 9 may be configured as downlink backhaul subframes. And according to the transmission time sequence of the downlink service and the corresponding uplink ACK/NACK feedback information defined by Rel-8, the uplink ACK/NACK feedback information transmitted by the downlink services of the subframes 4, 7, 8 and 9 is transmitted in the subframes 2, 3 and 3 respectively. Therefore, if the subframe 4 is configured as a downlink backhaul subframe, according to the present scheme, the relay station determines the subframe 2 as an uplink backhaul subframe; if the subframes 7 and/or 8 and/or 9 are configured as downlink backhaul subframes, the relay station determines that the subframe 3 is an uplink backhaul subframe.

Subframe uplink and downlink configuration 5:

for the subframe uplink and downlink configuration 5, if there is only one uplink subframe, if the subframe is configured as an uplink backhaul subframe, there will be no resource available for the access link uplink service transmission, so the backhaul subframe configuration method described in this scheme is not supported under the subframe uplink and downlink configuration.

Subframe uplink and downlink configuration 6:

for the subframe uplink and downlink configuration 6, only the subframe 9 may be configured as a downlink backhaul subframe. And according to the downlink service defined by Rel-8 and the transmission time sequence of the corresponding uplink ACK/NACK feedback information, the uplink ACK/NACK feedback information transmitted by the downlink service of the subframe 9 is transmitted in the subframe 4. Therefore, if the subframe 9 is configured as a downlink backhaul subframe, according to the present scheme, the relay station determines the subframe 4 as an uplink backhaul subframe.

For 7 uplink and downlink subframe configurations of the TDD system, the above scheme may be summarized: and if the downlink subframe n is configured as a downlink backhaul subframe, determining that the uplink subframe n + l is a backhaul subframe, and l is determined according to the downlink service defined by Rel-8 and the transmission time sequence of the corresponding uplink ACK/NACK feedback information. This results in a table of values for l, as shown in table 6.

Table 6 table of values of timing relationship l between downlink and uplink backhaul subframes in TDD LTE system

Therefore, the relay station can conveniently determine the uplink relay subframe corresponding to the downlink relay subframe through table lookup.

After the base station selects one or more subframes to configure as downlink relay subframes aiming at the uplink and downlink configuration of the current subframe, wherein:

The base station may determine the corresponding uplink relay subframe according to the configured downlink relay subframe in the same manner as the relay station, specifically:

However, in a variation of this embodiment, the constructed relay subframe configuration set may be configured on the base station as in the first embodiment, and when configuring the relay subframe, the base station may extract a part or all of the configured relay subframe configuration sets corresponding to the uplink and downlink configuration of the current subframe, and configure subframes in the part or all of the relay subframe configuration sets as relay subframes used for relay link transmission in the uplink and downlink configuration of the current subframe.

After backhaul subframe configuration is performed by using this embodiment, transmission timing sequences of uplink services and corresponding downlink ACK/NACK feedback information of a backhaul link configured in uplink and downlink of some subframes may not be consistent with the definition of Rel-8, and transmission timing sequences of downlink authorization information and corresponding uplink services configured in uplink and downlink of some subframes may not be consistent with the definition of Rel-8 protocol. For this situation, the transmission timing of the uplink service of the backhaul link and the corresponding downlink ACK/NACK feedback information, and/or the transmission timing of the uplink grant information and the corresponding uplink service may be redefined according to the backhaul subframe configuration. When the transmission time sequence of uplink service and corresponding downlink ACK/NACK feedback information in a backhaul subframe group consisting of uplink and downlink backhaul subframes cannot be transmitted according to the time sequence specified by a Rel-8 protocol, defining the transmission time sequence of new uplink service and corresponding downlink ACK/NACK feedback information in the backhaul subframe group, and transmitting the uplink service and the corresponding ACK/NACK downlink feedback information of the backhaul subframe according to the new transmission time sequence; and when the uplink authorization information in the backhaul subframe group and the transmission time sequence of the corresponding uplink service cannot be transmitted according to the time sequence defined by the Rel-8 protocol, defining new uplink authorization information and the transmission time sequence of the corresponding uplink service in the backhaul subframe group.

After determining the uplink and downlink relay subframes, the method for implementing relay transmission may be the same as that in the first embodiment.

This problem will be further described below in conjunction with the uplink and downlink configuration of each subframe.

This problem is not involved for subframe uplink and downlink configuration 0.

For the subframe uplink and downlink configuration 1, the transmission timing of the backhaul link uplink service and the corresponding downlink ACK/NACK feedback, and the transmission timing of the uplink grant information and the corresponding uplink service are all defined as same as those of the Rel-8 protocol.

For the subframe uplink and downlink configuration 2, if the subframe 3 or 8 is configured as a downlink backhaul subframe, according to the present scheme, the transmission timing and uplink grant timing of the backhaul link downlink ACK/NACK feedback information are defined as the same as those of the Rel-8 protocol. If the subframe 9 or 4 is configured as a downlink backhaul subframe and the subframe 3 or 8 is not configured as a downlink backhaul subframe, the transmission timing of the downlink ACK/NACK feedback information of the backhaul link and the uplink grant timing need to be redefined. But one problem that arises here is that the downlink feedback delay of the backhaul link will be very large. Therefore, when 1 downlink backhaul subframe is needed, the subframe 3 or 8 is preferentially configured as the downlink backhaul subframe, and when more backhaul subframes are needed, the subframe 9 or 4 may be considered to be configured as the downlink backhaul subframe. At this time, the transmission timing and the uplink authorization timing of the backhaul downlink ACK/NACK feedback information are defined as the Rel-8 protocol.

For subframe uplink and downlink configuration 3, if subframes 7 and/or 8 are configured as downlink backhaul subframes, subframe 3 is regarded as an uplink backhaul subframe according to the present scheme. At this time, the transmission timing of the uplink service of the backhaul link and the corresponding downlink ACK/NACK feedback, the uplink grant information, and the transmission timing of the corresponding uplink service cannot be guaranteed to be consistent with the definition of the Rel-8 protocol. Redefining the transmission time sequence of the uplink service and the corresponding downlink ACK/NACK feedback, and the transmission time sequence of the uplink authorization information and the corresponding uplink service. For example, the downlink feedback timing is defined as that downlink ACK/NACK feedback information transmitted in uplink in subframe 3 is transmitted in subframe 7, or defined as that downlink ACK/NACK feedback information is transmitted in subframe 8; the uplink grant timing is defined as the uplink grant for the uplink traffic transmission in subframe 3 being transmitted in subframe 7 or defined as being transmitted in subframe 8. Similarly, if the subframe 9 is configured as a downlink backhaul subframe, the subframe 4 is regarded as an uplink backhaul subframe. At this time, the downlink feedback time sequence and the uplink authorization time sequence of the backhaul link cannot be guaranteed to be consistent with the definition of the Rel-8 protocol. The downlink feedback timing and the uplink grant timing may be redefined on the backhaul link. For example, the downlink feedback timing is defined as that downlink ACK/NACK feedback information transmitted by subframe 4 in uplink is transmitted in subframe 9; the uplink grant timing is defined as that the uplink grant of the uplink service transmission of the subframe 4 is transmitted in the subframe 9.

For the subframe uplink and downlink configuration 4, if one downlink backhaul subframe is needed, the downlink subframe 9 is preferably configured as the downlink backhaul subframe, and according to the scheme, the uplink subframe 3 is configured as the downlink backhaul subframe. At this time, the transmission time sequence of the uplink service of the backhaul link and the corresponding downlink ACK/NACK feedback, the transmission time sequence of the uplink authorization information and the corresponding uplink service are all kept consistent with Rel-8. If more downlink backhaul subframes are needed, subframes 7 and/or 8 may be further configured as downlink backhaul subframes.

This problem is not involved for the subframe uplink and downlink configuration 5.

For the subframe uplink and downlink configuration 6, the subframe 9 may be configured as a downlink backhaul subframe. According to the scheme of the present invention, subframe 4 is taken as an uplink backhaul subframe. At this time, the transmission timing sequence of backhaul uplink grant information and corresponding uplink service may be kept consistent with Rel-8, but the transmission timing sequence of uplink service and corresponding downlink ACK/NACK feedback may not be kept consistent with the definition of Rel-8 protocol, and then the downlink ACK/NACK feedback information transmitted by the uplink service of subframe 4 may be redefined to be transmitted in subframe 9.

Based on the methods of the first and second embodiments, the present invention further provides a Time Division Duplex (TDD) system, including at least one base station and a relay station, wherein:

the base station includes:

the relay station includes:

Wherein,

the first relay subframe determining module may complete configuration of uplink and downlink relay subframes for relay link transmission on the base station according to the relay subframe configuration method in the first embodiment or the second embodiment.

The indicating module may indicate the part or all of the relay subframe configuration set to the relay station according to the method for indicating relay subframe configuration in the first embodiment; the second relay subframe determining module acquires the configuration set of part or all relay subframes according to the indication signaling and determines the subframes in the configuration set as the relay subframes used for relay link transmission; or

The indicating module indicates the configured information of the downlink relay subframe to the relay station according to the method for indicating the relay subframe configuration in the second embodiment; and the second relay subframe determines the configured downlink relay subframe according to the indication, and determines the corresponding uplink relay subframe according to the relay subframe configuration method in the second embodiment.

The first communication module and the second communication module may perform transmission of uplink service and corresponding downlink ACK/NACK feedback information, and transmission of uplink grant information and corresponding uplink service according to the method for implementing relay transmission in the first embodiment and the second embodiment.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A relay subframe configuration method for a Time Division Duplex (TDD) system including at least a base station and a relay station, the method comprising:

2. The relay subframe configuration method of claim 1, wherein:

3. The relay subframe configuration method of claim 1, wherein:

4. The relay subframe configuration method of claim 3, wherein:

5. The relay subframe configuration method of claim 1, wherein:

6. The relay subframe configuration method of claim 1, wherein:

7. The relay subframe configuration method of claim 1, wherein:

8. The relay subframe configuration method of claim 1, wherein:

9. The relay subframe configuration method of claim 1, wherein:

10. The relay subframe configuration method according to any of claims 1 to 9, wherein:

11. A method for configuring and indicating a relay subframe, which is used for a Time Division Duplex (TDD) system including at least a base station and a relay station, the method comprising:

the method of claim 10, wherein the base station determines the subframes in the partial or all relay subframe configuration sets as relay subframes for relay link transmission under the uplink and downlink configuration of the current subframe;

12. The configuration and indication method according to claim 11, characterized in that:

13. The configuration and indication method according to claim 11, characterized in that:

14. The configuration and indication method according to claim 12, characterized in that:

represents rounding up; or,

represents rounding up; or

The length of the binary sequence is

represents rounding up, i is greater than or equal to 0 and less than or equal to 6; or,

said binary systemThe length of the sequence is

Wherein i is the serial number of the uplink and downlink configuration of the subframe, N_i ^subframe-setIndicates the number of relay subframe configuration sets in the subframe uplink and downlink configuration i,meaning rounding up, i is 0 or more and 6 or less.

15. A relay subframe configuration method for a Time Division Duplex (TDD) system including at least a base station and a relay station, the method comprising:

16. The method for configuring relay subframe according to claim 15, wherein the base station and/or the relay station determines the uplink relay subframe for each downlink relay subframe according to the following manner:

17. The relay subframe configuration method of claim 15, wherein:

subframe uplink and downlink configuration 1, one or more of subframes 4 and 9 can be configured as downlink relay subframes, and the corresponding l value is 4 and 4;

subframe uplink and downlink configuration 2, one or more of subframes 3, 4, 8 and 9 can be configured as downlink relay subframes, and corresponding l values are 4, 8, 4 and 8 in sequence;

subframe uplink and downlink configuration 3, wherein one or more of subframes 7, 8 and 9 can be configured as downlink relay subframes, and the corresponding l values are 6, 5 and 5 in sequence;

subframe uplink and downlink configuration 4, wherein one or more of subframes 4, 7, 8 and 9 can be configured as downlink relay subframes, and the corresponding l values are 8, 6, 5 and 4 in sequence;

subframe uplink and downlink configuration 6, subframe 9 can be configured as a downlink relay subframe, and the corresponding value l is 5.

18. The method for configuring relay subframes according to claim 15, wherein the current subframe uplink and downlink configuration is one or more of the following subframe uplink and downlink configurations, and the downlink relay subframes and the uplink relay subframes configured correspondingly are as follows:

19. A method for configuring and indicating a relay subframe, which is used for a Time Division Duplex (TDD) system including at least a base station and a relay station, the method comprising:

the relay station obtains the configured downlink relay subframe from the indication signaling, and then determines a corresponding uplink relay subframe according to the relay subframe configuration method of claim 15, 16, 17 or 18.

20. The configuration and indication method according to claim 19, characterized in that:

21. The configuration and indication method according to claim 19, characterized in that:

22. The configuration and indication method according to claim 19, characterized in that:

the base station selects one or more subframes to be configured as downlink relay subframes aiming at the current subframe uplink and downlink configuration, and then determines the corresponding uplink relay subframes according to the relay subframe configuration method of claim 15, 16, 17 or 18; wherein:

23. A method for implementing relay transmission in a Time Division Duplex (TDD) system including at least a base station and a relay station, comprising:

24. The method of claim 23, wherein:

25. The method of claim 23, wherein:

26. The method of claim 23, wherein:

27. The method of claim 23, wherein:

the base station and the relay station determine the relay subframe used for relay link transmission under the uplink and downlink configuration of the current subframe according to the relay subframe configuration and indication method in claims 11, 12, 13, 14, 21 or 22.

28. A Time Division Duplex (TDD) system comprising at least one base station and a relay station, wherein:

the base station includes:

the relay station includes:

29. The Time Division Duplex (TDD) system of claim 28, wherein:

the first relay subframe determining module completes the configuration of uplink and downlink relay subframes for relay link transmission on a base station according to the relay subframe configuration method of claim 10 or 22;

the indication module indicates the part or all of the relay subframe configuration set to the relay station according to the indication method of the relay subframe configuration of claim 11, 12 or 14; the second relay subframe determining module acquires the configuration set of part or all relay subframes according to the indication signaling and determines the subframes in the configuration set as the relay subframes for relay link transmission; or, the indicating module indicates the configured information of the downlink relay subframe to the relay station according to the method for indicating the relay subframe configuration in claim 19 or 22; the second relay subframe determines a configured downlink relay subframe according to the indication, and determines a corresponding uplink relay subframe according to the relay subframe configuration method of claim 15, 16, 17 or 18.