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WO2008127038A1 - Dispositif et procédé pour transmettre une signalisation de commande de programmation de liaison descendante dans un système de communication sans fil - Google Patents

Dispositif et procédé pour transmettre une signalisation de commande de programmation de liaison descendante dans un système de communication sans fil Download PDF

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Publication number
WO2008127038A1
WO2008127038A1 PCT/KR2008/002057 KR2008002057W WO2008127038A1 WO 2008127038 A1 WO2008127038 A1 WO 2008127038A1 KR 2008002057 W KR2008002057 W KR 2008002057W WO 2008127038 A1 WO2008127038 A1 WO 2008127038A1
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WIPO (PCT)
Prior art keywords
downlink
sub
frame
control channel
frames
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Ceased
Application number
PCT/KR2008/002057
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English (en)
Inventor
Ju-Ho Lee
Xiaoqiang Li
Yingyang Li
Yujian Zhang
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Beijing Samsung Telecom R&D Center
Samsung Electronics Co Ltd
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Beijing Samsung Telecom R&D Center
Samsung Electronics Co Ltd
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Publication of WO2008127038A1 publication Critical patent/WO2008127038A1/fr
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Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0092—Indication of how the channel is divided

Definitions

  • the present invention relates to a wireless communication system, in particular to device and method for transmitting downlink scheduling control signaling in a wireless communication system.
  • OFDM Orthogonal Frequency Division Multiplexing
  • SCFDMA Single Carrier Frequency Division Multiple Access
  • SCFDMA is essentially a kind of single carrier transmission technology with a lower PAPR (Peak to Average Power Ratio). Therefore, the power amplifier of a mobile terminal can operate efficiently to enlarge cell coverage. Meanwhile, with the addition of Cyclic Prefix and frequency domain equilibrium, SCFDMA technique is lower in processing complexity.
  • Wireless communication systems can be divided in terms of duplex mode into frequency division duplex (FDD) and time division duplex (TDD).
  • FDD mode two-way communication in a wireless system is implemented at two frequencies spaced by a distance so that the communication entity can simultaneously perform receiving and transmitting.
  • TDD mode two-way communication in a wireless system is implemented at one same frequency so that the communication entity cannot simultaneously perform receiving and transmitting, i.e., the operations of receiving and transmitting are separated in time.
  • Two different types of TDD frame structures exist in LTE, i.e., Generic TDD Frame Structure and Alternative TDD Frame Structure (A-TDD).
  • A-TDD Alternative TDD Frame Structure
  • the generic TDD frame structure is basically the same as the FDD frame structure, while the alternative TDD frame structure has its own special structure. In the following, description on these two types of frame structures will be given respectively.
  • the radio resource in an LTE system refers to time and frequency resource that can be occupied by system or user equipment(UE), and it can be differentiated from each other by the unit of radio frame (101-103).
  • the time duration of a radio frame is the same as that in a WCDMA system, i.e., 10ms.
  • Each frame is subdivided into several slots (104-107).
  • each radio frame comprises 20 slots, each of which is 0.5ms long; each slot includes multiple OFDM symbols.
  • the time duration of a valid OFDM symbol is about 66.7 ⁇ s.
  • short CP time duration is about 4.8 ⁇ s
  • long CP time duration is about 16.7 ⁇ s.
  • the long CP slot is used in the case of multi-cell broadcast/multicast and the case that the cell radius is very long.
  • the short CP slot (108) contains 7 OFDMA symbols
  • the long CP slot (109) contains 6 OFDM symbols.
  • Figure 2 illustrates the frame structure of an LTE A-TDD system, a radio frame (201-203) is 10ms long; each frame is equally divided into two half-frames of 5ms(204, 205); and each half-frame includes seven slots (206-212) and three special fields, i.e., downlink pilot time slot (DwPTS) (213), guard period (GP) (214) and uplink pilot time slot (UpPTS) (215).
  • DwPTS downlink pilot time slot
  • GP guard period
  • UpPTS uplink pilot time slot
  • Time slot 0 (206) and DwPTS in each half-frame are fixed for downlink transmission
  • time slot 1 (207) and UpPTS in each half-frame are fixed for uplink transmission.
  • each slot (206-212) includes 20736 samples and has time of 0.625ms; DwPTS includes 2572 samples and has time of 83.7ms; GP includes 1536 samples and has time of 50ms; UpPTS includes 4340 samples and has time of 141.3ms.
  • the valid OFDM symbol duration is about 66.7 ⁇ s
  • the CP time duration of an OFDM symbol can be in following two cases: short CP time duration is about 7.29 ⁇ s, and long CP time duration is about 16.67 ⁇ s.
  • a short CP slot (216) includes 9 OFDM symbols and one time interval (TI) (218), while a long CP slot (217) includes 8 OFDM symbols and one TI (219). It is noted that the two TIs (218, 219) are different in time duration. According to the present discussion result, each slot is one sub- frame.
  • the transmission mode is called the localized transmission mode. And if user data is mapped to discretely distributed sub-carriers, it is called the distributed transmission mode.
  • This resource allocation method is called orthogonal resource allocation in frequency domain.
  • the orthogonal resource allocation method in time domain is that a base station (BS) transmits data with different time slots or OFDM symbols for the UEs in the same cell.
  • BS implements resource allocation and controls reception and transmission of each UE by transmitting control signaling at each scheduling moment.
  • the control signaling for each UE is called downlink physical control channel.
  • the downlink physical control channel can bear both downlink scheduling control signaling and uplink scheduling control signaling. Meanwhile, the downlink physical control channel can also transmit acknowledgement information (ACK/NACK) for uplink transmission data.
  • ACK/NACK acknowledgement information
  • P-SCH Primary Synchronization Channel
  • DwPTS Primary Synchronization Channel
  • system broadcast information can be transmitted via Primary Broadcast Channel (hereafter referred to as P-BCH) and Dynamic Broadcast Channel (hereafter referred to as D-BCH).
  • P-BCH Primary Broadcast Channel
  • D-BCH Dynamic Broadcast Channel
  • S-BCH Secondary Broadcast Channel
  • the object of the present invention is to provide device and method for transmitting downlink scheduling control signaling in a TDD system.
  • a method for transmitting downlink scheduling control signaling in a time division duplex (TDD) system comprising: a) In the TDD system, transmitting, by a base station, time domain resource information in downlink physical control channel to indicate sub-frames used in downlink data transmission among residual sub-frames in a scheduling period; b) transmitting said downlink physical control channel by the base station.
  • TDD time division duplex
  • a method for receiving control signaling by a user equipment(UE) in a time division duplex(TDD) system comprising steps of: a) detecting downlink physical control channel by the UE in the TDD system; b) reading downlink data by the UE according to the information on sub- frames that are used for transmitting the downlink data among the residual sub- frame in a scheduling period and indicated by time domain resource information transmitted in the downlink physical control channel.
  • a device for transmitting downlink scheduling control signaling by a base station in a time division duplex(TDD) system comprises a transmitting part and further comprises: a scheduler module which determines how to allocate resource blocks to each user equipment(UE) according to CQI reported by the UE and the data service information of the UE; a control signaling generator module which generates one or more downlink physical control channels according to the allocation of the resource blocks, and transmits time domain resource information in each of the downlink physical control channel to indicate sub-frames used for downlink data transmission among the residual sub- frames in a scheduling period; said transmitting means transmits each of the downlink physical control channel into wireless channel.
  • a scheduler module which determines how to allocate resource blocks to each user equipment(UE) according to CQI reported by the UE and the data service information of the UE
  • a control signaling generator module which generates one or more downlink physical control channels according to the allocation of the resource blocks, and transmits time domain resource information in each of the downlink physical control channel to indicate sub-
  • a device for processing control signaling by a user equipment(UE) in a time division duplex(TDD) system comprises a receiving part and further comprises: a physical channel de-multiplexer which de-multiplexes the received signal to obtain each downlink physical control channel and other physical channels; a control signaling processor which provides the physical channel demultiplexer with information on sub-frames that are used for downlink data transmission among the residual sub-frames in a scheduling period for downlink data transmission and indicated by time domain resource information transmitted in the downlink physical control channel; said receiving means receives RF signals transmitted from a base station, and transmits to the physical channel de-multiplexer after RF reception and AfD conversion.
  • a method for transmitting downlink scheduling control signaling in a time division duplex(TDD) system comprising: a) in the TDD system, configuring, by a base station, to use two sub-frames per half-frame to transmit downlink physical control channel; b) transmitting said downlink physical control channel by the base station.
  • TDD time division duplex
  • a method for receiving control signaling by a user equipment(UE) in a time division duplex(TDD) system comprising: a) in the TDD system, when a base station configures to use two sub-frames per half-frame to transmit downlink physical control channel, receiving, by the UE, only downlink scheduling control signaling in one of said two sub-frames and only uplink scheduling control signaling in the other; b) receiving downlink data or transmitting uplink data by the UE according to the received downlink or uplink scheduling control signaling.
  • a method for receiving control signaling by a user equipment(UE) in a time division duplex(TDD) system comprising: a) in the TDD system, when a base station configures to use two sub-frames per half-frame to transmit downlink physical control channel, in the sub-frame that does not transmit downlink scheduling control signaling separately, first detecting, by the UE, whether there is transmission of uplink scheduling control signaling, if yes, further detecting whether there is transmission of downlink scheduling signaling, if no uplink scheduling control signaling is transmitted, stopping detecting downlink physical control channel of the current sub- frame; in the sub-frame that do not transmit uplink scheduling control signaling separately, first detecting, by the UE, whether there is transmission of downlink scheduling control signaling, if yes, further detecting whether there is transmission of uplink scheduling signaling, if no downlink scheduling control signaling is transmitted, stopping detecting downlink physical control channel of the current sub-frame; b) receiving downlink data or transmitting uplink data
  • a method for transmitting downlink scheduling control signaling in a time division duplex(TDD) system comprising: a) in an alternative TDD frame structure, configuring, by a base station, part of time-frequency resource in downlink pilot time slot to transmit downlink physical control channel; b) transmitting said downlink physical control channel in said downlink pilot time slot by the base station.
  • TDD time division duplex
  • Figure 1 shows the frame structures of downlink FDD and generic TDD in a LTE.
  • Figure 2 shows the frame structure of LTE A-TDD system.
  • Figure 3 shows an example of the allocation for uplink and downlink in a LTE A-TDD system.
  • Figure 4 shows an example of the allocation for uplink and downlink in a LTE generic TDD system.
  • Figure 5 shows a diagram of device for resource scheduling and control signaling transmitting by BS. .
  • Figure 6 shows a diagram of device for control signaling processing by UE.
  • Figure 7 is a schematic diagram of embodiment 1.
  • Figure 8 is an example of hardware block diagram of a transmitter in BS;.
  • Figure 9 is an example of hardware block diagram of a receiver in UE.
  • Figure 10 is a schematic diagram of embodiment 2.
  • Figure 11 is a schematic diagram of embodiment 3.
  • Method 1 transmitting in downlink physical control channel time domain resource information indicating sub-frames used in data transmission among the residual scheduling period
  • This method comprises steps of: a) In the TDD system, transmitting, by a base station, time domain resource information in downlink physical control channel to indicate sub-frames used in downlink data transmission among residual sub-frames in a scheduling period; b) transmitting said downlink physical control channel by the base station.
  • the scheduling period refers to the downlink time interval for which UE is scheduled.
  • a scheduling period can be divided in two forms. One is to use a half-frame as a scheduling period, and the other is to use as start point of a scheduling period the first downlink sub- frame succeeding a uplink-to-downlink conversion point, and to use sub-frame 0 in the next half-frame as finish point of the scheduling period.
  • Figure 3 Let's take Figure 3 as an example to explain the resource allocation for uplink and downlink.
  • sub-frame 0 (301), DwPTS (302), sub-frame 3 (307), sub-frame 4 (308), sub-frame 5 (309) and sub-frame 6 (310) are used to transmit downlink data
  • UpPTS (304), sub-frame 1 (305) and sub-frame 2 (306) are used to transmit uplink data.
  • the scheduling period of the above first form is shown as scheduling period 1 in Figure 3, including sub-frame 0, sub-frame 3, sub-frame 4, sub-frame 5 and sub-frame 6.
  • the scheduling period of the above second form is show as scheduling period 2 in Figure 3, including sub-frame 3, sub-frame 4, sub-frame 5, sub-frame 6, and sub-frame 0 in the next half-frame. It is noticeable that DwPTS is not included in the above description, since DwPTS includes only one OFDM symbol. If it is used to transmit data, it can be considered as extension of sub- frame 0.
  • BS transmits the data of a corresponding UE in the sub- frame for the transmission of downlink physical control channel, and at the same time, uses time domain resource information in the downlink physical control channel to indicate sub-frames among the residual sub-frames in a scheduling period that are used in downlink data transmission.
  • the length of the time domain resource information can be fixed (i.e., independent of the position of the sub- frame transmitted via the downlink physical control channel) or variable (i.e., related to the position of the sub-frame transmitted via the downlink physical control channel).
  • the reason why the length of the time domain resource information can be variable is that within the scheduling period, UE's data is not transmitted before the transmission of the sub-frame transmitted over the downlink physical control channel.
  • time domain resource information of fixed and variable lengths is on the premise of the resource allocation ratio for uplink and downlink.
  • the time domain resource information can be indicated in two approaches.
  • One approach is to use Bitmap, i.e., to use one bit to indicate whether a sub-frame has any corresponding downlink data transmission. This approach is very flexible and can support the case where the downlink data is transmitted discontinuously within a scheduling period.
  • the other approach is to indicate the number of used sub-frames. With this approach, it is required that downlink data of some UE be transmitted continuously within a scheduling period.
  • N 5 downlink sub-frames
  • DL t 5 downlink sub-frames
  • DL x 5 downlink sub-frames
  • DL 2 is sub-frame 4
  • DZ 3 is sub-frame 5
  • DL 4 is sub-frame 6.
  • DL 0 is sub-frame 3
  • DL 1 is sub-frame 4
  • DL 2 is sub-frame 5
  • DL 3 is sub-frame 6
  • DL 4 is sub- frame 0 in the next half-frame.
  • DL 0 is sub-frame 0
  • DL 1 is sub-frame 1
  • DZ 2 is sub-frame 2
  • DL 0 is sub- frame 5
  • DL x is sub-frame 6
  • DL 2 is sub-frame 7.
  • UE detects the corresponding downlink physical control channel in DL ⁇ ,0 ⁇ j ⁇ N - 1.
  • Combination 1 the length of the time domain resource information is fixed and bitmap is applied in indication.
  • bitmap is adopted to indicate whether any data of UE corresponding to the downlink physical control channel is transmitted by sub-frames within the scheduling period except the sub-frames that are adopted to transmit the downlink physical control channel.
  • N - I bits are used to indicate whether UEs' downlink data is transmitted in DL 1 ,0 ⁇ / ⁇ N - 1, i ⁇ j .
  • information on DL 1 ,0 ⁇ / ⁇ j can be arbitrarily configured, since the transmission of UE's downlink data starts with DL 1 in the scheduling period.
  • Combination 2 the length of the time domain resource information is fixed and the number of sub-frames is applied in indication.
  • the time domain resource information is the number of sub-frames (except those used to transmit the downlink physical control channel within the scheduling period) that control channel.
  • ⁇ log 2 N ⁇ ⁇ (where ⁇ x] means to ceiling operation on x ) bits are fixedly used to indicate whether the UE's downlink data is transmitted in DL 1 , j ⁇ i ⁇ N - ⁇ .
  • the value indicated by time-frequency resource is M .
  • Combination 3 the length of the time domain resource information is variable and bitmap is applied in indication.
  • bitmap of variable length is used to indicate whether any data of UE corresponding to the downlink physical control channel is transmitted in sub-frames within the scheduling period except those used to transmit the downlink physical control channel.
  • N -j -l bits are used to indicate whether UEs' downlink data is transmitted in DL,,j ⁇ i ⁇ N - 1 .
  • DL 1 X indicates that UE's downlink data is transmitted in DL 1
  • Combination 4 the length of the time domain resource information is variable and the number of sub-frames is applied in indication.
  • the time domain resource information is the number of sub-frames (except those used to transmit the downlink physical control channel within the scheduling period) that are used to transmit data of the UE corresponding to the downlink physical control channel. In this way, bits are used to indicate whether the
  • UE's downlink data is transmitted in DL n J ⁇ i ⁇ N - I .
  • the value indicated by time frequency resource is M .
  • the difference between this combination and combination 2 lies in that in combination 2, fixed bits are applied to indicate time domain resource information, while in this combination, the length of the time domain resource information is determined by the position where the downlink physical control channel is transmitted.
  • this method is not confined to correspondence to one same UE, or to whether the downlink data transmitted in different sub-frames within the same scheduling period is jointly encoded or individually encoded. Meanwhile, this method is not confined to whether these different sub-frames belong to the same HARQ process or different HARQ processes.
  • UE operates as follows: a) In a TDD system, UE detects downlink physical control channel. b) UE reads downlink data according to information on sub-frames which are used in downlink data transmission among the residual sub-frames in the scheduling period and are indicated by the time domain resource information transmitted in the downlink physical channel.
  • Step a) UE first detects the downlink physical control channel.
  • UE can detect the downlink physical control channels in all or part of downlink sub- frames (which can be configured by the network) within the scheduling period.
  • D-BCH or S-BCH
  • BS broadcasts the positions of sub-frames necessary to be specifically detected. Therefore, UE which takes this BS as its serving BS (Serving Node B) can detect the downlink physical control channel according to the configuration information.
  • BS can separately configure the positions of downlink sub-frames to be detected by each UE through high level signaling.
  • Step b) if UE detects that BS transmits downlink physical control channel to it in some sub-frame, it reads this downlink physical control channel and obtains the positions of the sub-frames used by the downlink data within the scheduling period according to the time domain resource information. Thus, UE can read corresponding downlink data.
  • FIG. 5 shows the devices for BS in scheduling resources and transmitting control signaling.
  • the control signaling generator 502 in BS embodies the present invention.
  • the scheduler module 501 in BS determines how to allocate resources to respective UEs according to CQI reported from UEs and the data service information on UEs.
  • the control signaling generator 502 in BS generates one or more downlink physical control channels according to the status of resource allocation, and transmits the time domain resource information in each of the downlink physical control channels to indicate sub-frames which are used for the transmission of downlink data among the residual sub-frames within the scheduling period.
  • BS transmits each of the downlink physical control channels in transmitting means 503.
  • the detailed hardware block diagram of the transmitting means in BS is given in embodiments.
  • FIG. 6 shows the devices for UE in processing control signaling.
  • the control signaling processor 603 in UE is embodies the present invention.
  • the receiving means 601 receives RF signal sent from BS. After RF receiving and A/D conversion, the received signal is de-multiplexed in the physical channel de-multiplexer 602 to obtain respective downlink physical control channels and other physical channels.
  • UE obtains the information on sub-frames, which are used for the transmission of downlink data among the residual sub-frames within the scheduling period and indicated by the time domain resource information transmitted in the downlink physical control channel, and provides the information to the physical channel de-multiplexer 602, so that UE can read corresponding downlink data.
  • the detailed hardware block diagram of receiving means in UE is given in the the following embodiments.
  • Method 2 BS configures to transmit downlink physical control channel in two sub-frames in each half-frame. This method includes: a) In a TDD system, BS configures to transmit downlink physical control channel in two sub-frames in each half-frame ; b) BS transmits the downlink physical control channel.
  • the positions of the two sub-frames can be fixed or configured by the network. If two fixed sub-frames are adopted, one approach is to transmitting the downlink physical control channel in sub-frame 0 and the first sub-frame succeeding an uplink-to-downlink conversion point. Take as an example the LTE A-TDD system illustrated in Figure 3, the downlink physical control channel is transmitted in sub-frame 0 (301) and sub-frame 3 (307).
  • BS broadcasts the positions of the two sub- frames in D-BCH (orS-BCH). Therefore, UE taking this BS as its serving Node B can detect the downlink physical control channel according to the configuration information.
  • BS can separately notify each UE of the positions of the two sub-frames transmitting the downlink physical control channel through high level signaling.
  • Three configurations can be set for the type of the downlink physical control channel transmitted in the two sub-frames.
  • Configuration 1 no restrictions are set on the type of the downlink physical control channel transmitted in the two sub-frames, i.e., both the downlink scheduling control signaling and the uplink scheduling control signaling can be transmitted in the two sub-frames. Such manner offers maximum flexibility for BS in its scheduling.
  • Configuration 2 only downlink scheduling control signaling is transmitted in through one of the two sub-frames, while only uplink scheduling control signaling is transmitted in the other. For instance, given that the transmission of downlink physical control channels is in sub-frame 0 and the first sub-frame succeeding the uplink-to-downlink conversion point, one approach is to transmit uplink scheduling control signaling in sub-frame 0 and downlink scheduling control signaling in the first sub-frame succeeding the uplink-to-downlink conversion point. In this case, UE can perform corresponding detection in specific sub-frames only according to the type of the control signaling to be detected.
  • UE in sub-frame 0, UE needs to only detect the downlink physical control channel according to the possible format of the uplink scheduling control signaling; while in the first sub-frame succeeding the uplink- to-downlink conversion point, UE can detect downlink physical control channel only according to the possible format of the downlink scheduling control signaling.
  • Configuration 3 downlink scheduling control signaling is not independently transmitted in one of the two sub-frames, and uplink scheduling control signaling is not independently transmitted in the other sub-frame.
  • BS can select one of the two sub-frames to simultaneously transmit the two downlink physical control channels if the timing requirement is met; or, for the reason of timing, the two control signaling could not be transmitted simultaneously in the same sub-frame, BS transmits the downlink control signaling and the uplink control signaling in the two sub-frames, respectively.
  • the timing reason refers to the restriction on timing position that results from such factors as the processing time of BS or UE, and the frame structure of the TDD system.
  • the transmission should be only performed in some specific sub-frame, and the sub-frame for the independent downlink scheduling control signaling is different from that for the independent uplink scheduling control signaling. For instance, given that both sub-frame 0 and the first sub-frame succeeding the uplink-to-downlink conversion point are used to transmit downlink physical control channel, the downlink scheduling control signaling is not independently transmitted in sub-frame 0, and the uplink scheduling control signaling is not independently transmitted in the first sub-frame succeeding the uplink-to- downlink conversion point.
  • BS can select one of the two sub- frames to simultaneously transmit the two downlink physical control channels if the timing requirement is met; if, for the reason of timing, the two types of control signaling could not be transmitted simultaneously in the same sub-frame, BS transmits the downlink control signaling in the first sub-frame succeeding the uplink-to-downlink conversion point and transmits the uplink control signaling in sub-frame 0.
  • BS transmits the downlink control signaling in only the first sub-frame succeeding the uplink-to- downlink conversion point; and if only uplink scheduling control signaling exists in one half-frame for one UE, BS transmits the uplink control signaling in sub- frame 0.
  • UE operates as follows. In the sub-frame which does not transmit independently the downlink scheduling control signaling, UE first detects whether any uplink scheduling control signaling is included in the transmission. If yes, UE further detects whether there is any transmission of downlink scheduling signaling; if not, UE stops detecting the downlink physical control channel of the current sub-frame.
  • UE In the sub-frame which does not transmit independently the uplink scheduling control signaling, UE first detects whether there is any transmission of downlink scheduling control signaling. If yes, UE further detects whether there is any transmission of uplink scheduling signaling; if not, UE stops detecting downlink physical control channel of the current sub-frame.
  • the downlink scheduling control signaling discussed above does not include the downlink transmitted ACK/NAK.
  • ACK/NAK can be always transmitted in sub-frame 0.
  • the other mode is to transmit ACK/NAK in arbitrary one of the two sub-frames. For each UE, however, which sub-frame is used by BS to transmit downlink ACK/NAK can be determined by the timing requirements or be configured by BS.
  • Method 3 use part of time-frequency resource in the downlink pilot time slot (DwPTS) to transmit downlink physical control channel
  • This method includes: a) In the alternative TDD frame structure, BS configures to transmit the downlink physical control channel with part of time-frequency resource in the downlink pilot time slot; b) BS transmits the downlink physical control channel in the downlink pilot time slot.
  • the transmitted downlink physical control channel includes the downlink scheduling control signaling, the uplink scheduling control signaling, and ACK/NACK information on the uplink transmission data.
  • BS configures in D-BCH (or S-BCH) that part of time-frequency resource in DwPTS is used to transmit downlink physical control channel. For instance, BS can configure all sub-carriers in DwPTS, except for the transmission of P-SCH, to transmit one or more of the three types of signaling, i.e., downlink scheduling control signaling, the uplink scheduling control signaling and the ACK/NACK to uplink data.
  • D-BCH or S-BCH
  • UE When UE learns about that transmission of downlink scheduling control signaling and uplink scheduling control signaling in DwPTS, it is necessary for UE to detect not only the downlink scheduling control signaling in downlink sub- frames, but also those in DwPTS. In the case that only ACK/NAK is transmitted in DwPTS, UE detects the transmission in DwPTS only when UE is configured by BS to receive ACK/NAK in DwPTS.
  • This embodiment corresponds to the case that BS transmits the time domain resource information in the downlink physical control channel to indicate the sub- frames which are used to transmit data among the residual sub-frames within a scheduling period.
  • sub-frame 0 (701), DwPTS (702), sub-frame 3 (708), sub-frame 4 (709), sub-frame 5 (310) and sub-frame 6 (711) are adopted to transmit downlink data
  • UpPTS (704), sub-frame 1 (705), sub-frame 2 (706) are adopted to transmit uplink data.
  • the second type of scheduling period includes sub-frame 3, sub-frame 4, sub-frame 5, sub-frame 6 and sub-frame 0 (712) in the next half- frame.
  • BS operates as follows. In this embodiment, suppose sub-frame 3 (707) is adopted by BS to transmit downlink physical control channel to some UE. The downlink physical control channel locates at the first several OFDM symbols in sub-frame 3.
  • BS adopts sub-frame 3, sub-frame 4 and sub-frame 5 to transmit downlink data to the UE.
  • the above Combination 3 is adopted to transmit the time domain resource information, i.e., bitmap of variable length is used to indicate the time frequency resource information.
  • BS transmits 4-bit time frequency resource information to indicate whether data for the UE is transmitted in sub-frame 4, sub-frame 5, sub-frame 6 and sub-frame 0 in the next half-frame.
  • BS transmits "1100" to indicate that downlink data for the UE is transmitted in sub-frame 4 and sub- frame 5, and no data is transmitted in sub-frame 6 or sub-frame 0 in the next half- frame.
  • UE operates as follows. UE first detects the downlink physical control channel. In this embodiment, UE detects that BS has transmitted downlink physical control channel to it in sub-frame 3. UE reads the downlink physical control channel. Through the time domain resource information "1100", UE learns that BS has transmitted the UE's downlink data in sub-frame 4 and sub- frame 5. Therefore, UE knows that within this scheduling period, BS has transmitted downlink data to the UE in sub-frame 3, sub-frame 4 and sub-frame 5, so that UE can read corresponding downlink data.
  • FIG 8 shows the hardware block diagram of a transmitter in BS.
  • BS generates one or more downlink physical control channels (801), and transmits time domain resource information in these channels to indicate the sub-frames which are adopted to transmit downlink data among the residual sub-frames in a scheduling period. Then, such operations as channel coding and interleaving (802) and rate matching (803) are performed to the signal, followed by QAM modulation (804), and the signal is input into multiplexer (809).
  • BS For data (805) of current UE, BS performs channel coding and interleaving (806), rate matching (807) and QAM modulation (808), and then it inputs the processed signal into the multiplexer (809); the multiplexer (809) multiplexes the control information together with data. Then BS performs such operations as OFDM modulation (IFFT) (810), adding cyclic prefix (811), D/A conversion (812) to the multiplexed signal, and finally the signal is transmitted through the transmitter (813) and antenna (814).
  • IFFT OFDM modulation
  • FIG. 9 shows an example of the hardware block diagram of UE receiver.
  • UE receives signal from BS through antenna (901) and RF receiver (902). After A/D conversion (903), removal of cyclic prefix (904) and OFDM demodulation (FFT) (905), the received signal is input into de-multiplexer (906).
  • A/D conversion 903
  • removal of cyclic prefix 914
  • OFDM demodulation 905
  • UE first processes the downlink physical control channel output from the de-multiplexer (906), performs such operations as QAM demodulation (907), rate de-matching (908), de-interleaving and channel decoding (909) to obtain the positions of the sub-frames (which are adopted to transmit downlink data within the scheduling period) indicated by the time domain resource information in the decoded downlink physical control channel (910), so that UE can read data from corresponding time-frequency resource in the de-multiplexer (906), and then performs such operations as QAM demodulation (911), rate de-matching (912), de-interleaving and channel decoding (913) to obtain user data (914) finally.
  • This embodiment corresponds to the case that BS transmits downlink physical control channel in two sub-frames in each half-frame, and further it transmits downlink scheduling control signaling not independently in one of the two sub-frames, and transmits uplink scheduling control signaling not independently in the other.
  • sub-frame 0, sub-frame 3, sub-frame 4, sub-frame 5 and sub-frame 6 are the downlink sub- frames
  • sub-frame 1 and sub-frame 2 are the uplink sub-frames.
  • BS uses sub-frame 0 and sub-frame 3 to transmit downlink physical control channel, and to transmit downlink scheduling control signaling not independently in sub-frame 0, to transmit uplink scheduling control signaling not independently in sub-frame 3.
  • BS adopts sub-frame 0 (1002) to transmit downlink physical control channel which contains some UE's uplink scheduling control signaling (1001), and the uplink scheduling control signaling indicates that UE transmits uplink data in sub-frame 2 (1004).
  • UE first detects whether any uplink scheduling control signaling is transmitted in sub-frame 0.
  • UE has detected the uplink scheduling controls signaling (1001) transmitted from BS, and further it goes on detecting whether there is any transmission of downlink scheduling control signaling and does not detect any corresponding downlink scheduling control signaling. Then, UE transmits uplink data in sub-frame 2.
  • BS adopts sub-frame 3 (1014) to transmit downlink physical control channel which contains some UE's downlink scheduling control signaling (1013), and the downlink scheduling control signaling indicates that UE will receive downlink data in sub-frame 4 (1015) and sub-frame 5 (1016).
  • UE first detects whether any downlink scheduling control signaling is transmitted in sub- frame 3.
  • UE has detected the downlink scheduling controls signaling (1013) transmitted from BS, and further it goes on detecting whether there is any transmission of uplink scheduling control signaling and does not detect any corresponding uplink scheduling control signaling. Then, UE receives downlink data in sub-frame 4 and sub-frame 5.
  • BS adopts sub-frame 0 (1021) to transmit downlink physical control channel which contains both uplink scheduling control signaling and downlink scheduling control signaling (1020) for some UE.
  • the uplink scheduling control signaling indicates that UE will adopt sub-frame 2 (1023) to transmit uplink data; the downlink scheduling control signaling indicates that UE adopts sub-frame 3 (1024) and sub-frame 4 (1025) to receive downlink data.
  • UE first detects whether any uplink scheduling control signaling is transmitted in sub- frame 0. In this example, UE has detected the uplink scheduling controls signaling transmitted from BS, and further it goes on detecting whether there is any transmission of downlink scheduling control signaling and has detected corresponding downlink scheduling control signaling. Then, UE transmits uplink data in sub-frame 2 and receives downlink data in sub-frame 3 and sub-frame 4.
  • This embodiment corresponds to the case that BS transmits downlink physical control channel with part of time- frequency resources in DwPTS.
  • what is transmitted is downlink ACK/NAK.
  • BS configures that UE will detect ACK/NAK in DwPTS. Therefore, when UE transmits uplink data in sub-frame 2 (1101), it detects the transmitted ACK/NAK in DwPTS (1102). Note that the downlink ACK/NAK in Figure 11 refers to only ACK/NAK for the UE. Then, based on the information in ACK/NAK, UE determines whether it is necessary to retransmit data.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé pour transmettre une signalisation de commande de programmation de liaison descendante dans un système TDD. Dans un système TDD, une BS transmet les informations de ressources de domaine temporel dans un canal de commande physique de liaison descendante pour indiquer quelles sous-trames parmi les sous-trames résiduelles dans une période de programmation sont utilisées pour transmettre des données de liaison descendante; et la BS transmet le canal de commande physique de liaison descendante. Ledit procédé permet de réduire efficacement le surdébit dans un canal de commande physique de liaison descendante de façon que le rapport d'utilisation du spectre du système soit considérablement amélioré. La complexité peut être efficacement réduite pour l'UE lors de la réception d'un canal de commande physique de liaison descendante de façon que le temps de veille de l'UE soit augmenté. Les ressources temps-fréquence du système peuvent être utilisées efficacement de façon que le rapport d'utilisation du spectre du système soit amélioré.
PCT/KR2008/002057 2007-04-11 2008-04-11 Dispositif et procédé pour transmettre une signalisation de commande de programmation de liaison descendante dans un système de communication sans fil Ceased WO2008127038A1 (fr)

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