CN101877621A - Method and device for sending downlink control channel PDCCH in LTE-A system - Google Patents

Abstract

A method for transmitting a downlink control channel PDCCH distribution in an LTE-A system, comprising steps: eNB divides a carrier element CC into an anchor carrier element Anchor CC and a non-anchor carrier element non-Anchor CC for a UE; The downlink control information DCI is generated and sent on the CC; the eNB decides whether to send the existing LTE DCI information on the non-Anchor CC of the UE according to the business and scheduling requirements; Search the DCI information sent by the eNB in the space; UE closes the corresponding non-Anchor CC radio frequency channel within a certain period of time according to the analysis of the subfield information bits in the DCI sent by the eNB on the Anchor CC and the specific indication timing relationship, and determines The non-Anchor CC index to be detected. The present invention solves the problem of how to accurately and timely turn off the radio frequency channel of the non-Anchor CC according to the scheduling of the eNB under the condition of multiple carrier elements of the LTE-A UE so as to reduce the energy consumption of the UE and prolong the standby time without affecting the LTE -A system's performance.

Description

Method and device for sending downlink control channel PDCCH in LTE-A system

technical field

The present invention relates to a wireless communication system, and more specifically, to a method for indicating position distribution of downlink control symbols in a wireless communication system, so as to facilitate UE to close part of radio frequency channels in a timely and accurate manner so as to reduce energy consumption and prolong standby time.

Background technique:

At present, the 3GPP standardization organization has completed the formulation of the LTE standard, and is developing a new standard based on the LTE standard for submission to the ITU organization as an alternative to IMT-Advance. This standard is called LTE-Advanced, referred to as LTE- a. The uplink of the LTE-A system adopts single carrier frequency division multiple access (SC-FDMA) or clustered discrete Fourier transform single carrier orthogonal frequency division multiplexing (Clustered DFT-S-OFDM) technology within 20M bandwidth , while supporting simultaneous transmission of uplink control symbols (PUCCH) and uplink data symbols (PUSCH) within a 20M bandwidth. The downlink is based on Orthogonal Frequency Division Multiplexing (OFDM) technology. The LTE-A system adopts two frame structures, frame structure type 1 adopts frequency division duplex (FDD), and frame structure type 2 adopts time division duplex (TDD).

At present, the LTE-A system uses carrier aggregation (Carrier aggregation) method to realize system bandwidth configurability, each carrier unit is called a carrier element (CC, Component carrier), LTE terminal (UE, User Equipment) can be in each CC It works normally on the Internet (as shown in FIG. 4 ). In the LTE-A system, the maximum system bandwidth is 100M.

In the LTE system, the eNB may send downlink control information (DCI, Downlink Control Information) in different formats to each UE according to the transmission mode configured by the UE. The DCI format used for uplink and downlink resource scheduling includes the following information: resource allocation (RA, Resource Allocation) information; modulation and coding information (MCS, Modulation and Coding rate)...etc. The eNB maps the encoded DCI information to the physical resources of the physical downlink control channel (PDCCH) predicted by the UE after encoding, and the UE obtains the DCI information sent by the eNB through a limited number of blind detections. The physical time-frequency resources occupied by the PDCCH are composed of one or more control channel elements (CCEs), and the number of CCEs can be 1, 2, 4 or 8. In the LTE-A system, the DCI coding method includes two candidate schemes, one is the DCI joint coding (Joint-coding) method of multiple CCs, and the other is to apply the existing DCI format in the LTE system to each CC. Separate coding. When the DCI in the LTE-A system uses a separate coding scheme, if the DCI format of the existing LTE system is used, the UE needs to detect all CCs in each subframe to obtain all the DCI information sent by the eNB . Figure 5 describes the structural block diagram of the UE receiver in detail. From the block diagram, we can clearly see that if the UE can timely and accurately turn off multiple CCs without any DCI information of the node at the same time, the power consumption of the terminal will be greatly reduced. , thereby prolonging the standby time of the terminal, which is of great significance for battery-powered mobile terminals.

Invention content:

The purpose of the present invention is to provide a sending method and sending device for the distribution of the downlink control channel PDCCH in the LTE-A system.

According to one aspect of the present invention, a method for sending a downlink control channel PDCCH distribution in an LTE-A system, comprising steps:

a. The eNB divides the carrier element CC into the anchor carrier element Anchor CC and the non-anchor carrier element non-Anchor CC for the UE;

b. The eNB generates and sends downlink control information DCI on the Anchor CC of the UE;

c. The eNB decides whether to send the existing LTE DCI information on the non-Anchor CC of the UE according to the business and scheduling requirements;

d. The UE searches for the DCI information sent by the eNB in its own search space on the Anchor CC of the local node in each downlink subframe;

e. UE closes the corresponding non-Anchor CC radio frequency channel within a certain period of time according to the analysis of the subfield information bits in the DCI sent by the eNB on the Anchor CC and the specific indication timing relationship, and determines the non-Anchor CC to be detected index.

According to another aspect of the present invention, a device for sending a downlink control channel PDCCH in an LTE-A system includes:

LTE DCI information bit generator, the output information bit stream enters encoder 1;

AI domain information bit generator, the output information bit stream enters encoder 2;

A bit concatenator, performing bit concatenation on the bit streams output by encoder 1 and encoder 2;

The rate matcher determines the number of bits that can be transmitted in this frame according to the number of resource units of available physical resources and performs rate matching on the bit stream output by the bit concatenator according to the rate matching principle of LTE for the bit stream after cascading;

The bit stream output by the rate matcher is processed and emitted by the antenna in the form of electromagnetic waves.

According to another aspect of the present invention, a device for sending a downlink control channel PDCCH in an LTE-A system includes:

LTE DCI information bit generator, the output information bit stream enters encoder 1;

AI domain information bit generator, the output information bit stream enters encoder 2;

The rate matcher determines the number of bits that can be transmitted in this frame according to the number of resource units of available physical resources and the number of resource units occupied by AI information bits, and performs rate matching on the concatenated bit stream according to the LTE rate matching principle match;

A bit concatenator, which performs bit concatenation on the bit stream output by the rate matcher and the encoder 2;

The bit stream output by the bit concatenator is processed and emitted by the antenna in the form of electromagnetic waves.

Using this method and sending device, the LTE-A system solves the problem of how to accurately and timely turn off the radio frequency channel of the non-Anchor CC according to the scheduling of the eNB when the LTE-A UE works under the condition of multiple carrier elements, so as to reduce the energy consumption of the UE and prolong the standby time. The issue of time will not affect the performance of the LTE-A system.

Description of drawings

Fig. 1 (a) is the block diagram 1 of transmitting end equipment of the present invention;

Fig. 1 (b) is the block diagram 2 of the transmitter equipment of the present invention;

Fig. 2 is a schematic diagram of the present invention;

Fig. 3 is a flow chart of the present invention;

Figure 4 is a 10ms frame structure diagram of the LTE-A FDD system;

FIG. 5 is a structural block diagram of a UE receiver in the prior art;

Fig. 6 is new LTE-A DCI format among the present invention;

Fig. 7 is a schematic diagram of the AI domain in the DCI format in the present invention;

Fig. 8 is a schematic diagram of the application of the duration indication subfield in the AI domain of the present invention;

Fig. 9 is the mapping relationship of the duration indication subfield in the AI domain of the present invention;

Fig. 10 is a sub-method flowchart for implicitly indicating non-Anchor CC DCI in the present invention;

Fig. 11 is a schematic diagram of a sub-method for displaying and indicating DCI information on a non-Anchor CC in the present invention;

Fig. 12 is a sub-method flow chart showing non-Anchor CC DCI indication in the present invention;

Fig. 13 is a schematic diagram of the first embodiment and the second embodiment of the present invention;

Fig. 14 is a schematic diagram of the third embodiment and the fourth embodiment of the present invention.

Detailed ways:

In the present invention, it is assumed that the eNB designates one of the multiple CCs as the anchor carrier element (Anchor CC) for each UE through high-layer signaling or when initializing access, and other carrier elements (CC) are called non-anchor carrier elements (non-anchor CC). Anchor CC), and the DCI of each CC adopts a separate coding method, as shown in Figure 4.

In the description of the present invention, if there is no special description that the UE closes the radio frequency channels of some non-Anchor CCs within a certain period of time, the non-Anchor radio frequency channels of the UE are always open or working.

Fig. 1 has provided two system block diagrams of the present invention, and a kind of transmitter block diagram of the present invention is as shown in Fig. 1 (a):

100: Existing variable-length LTE DCI information bit generator: eNB generates control information bit stream according to high-level scheduling instructions.

101: Encoder 1: used for channel encoding the output bit stream of the module 100. It contains two submodules:

101-0: CRC check bit generator: used to generate CRC check bits according to the information bit stream, and append them at the end of the information bits.

101-1: Truncated convolutional encoder: for performing truncated convolutional encoding on the output bitstream of module 101-0.

For the convenience of subsequent description, it is assumed that the length of the output information bit stream of encoder 1 is K, expressed as:

C={c ₀ ,c ₁ ,...,c _K-1 }

102: Information bit generator in AI domain in the present invention: eNB independently generates AI information according to scheduling information for non-Anchor CCs

bit.

103: Encoder 2: used to perform channel encoding on the output bit stream of module 102, the principle is that the encoding method adopted is more reliable than the encoding method of encoder 1, such as repeated encoding.

For the convenience of subsequent description, it is assumed that the length of the output information bit stream of encoder 2 is H, expressed as:

A={a ₀ , a ₁ ,..., a _H-1 }

104: The bit concatenator performs bit concatenation on the output of the module 103 and the output bit stream of the module 101 according to the sequence shown in FIG. 7 ,

S={A, C}={a ₀ , a ₁ , ..., a _H-1 , c ₀ , c ₁ , ..., c _K-1 }

105: Rate matcher: Assuming that the physical resources available for the entire control symbol are T resource elements (Resource Element, RE), the rate matcher determines the number of bits that can be transmitted in this frame according to T and concatenates the bit stream S Perform rate matching on the output bit stream of 104 according to the existing LTE rate matching principle.

106: A scrambler: the eNB generates a scrambling code according to its own cell-ID, and scrambles the output bit stream of 105, so as to eliminate interference among multiple cells.

107: Modulator: Map the output bit stream of 106 into signal points in the signal constellation

108: layer mapper: map the output symbol stream of 107 into multiple parallel data bit streams.

109: Precoder: perform pre-weighting processing on sending the data symbol stream of 108, so as to reduce the influence of the channel on the data.

110: resource mapper: map the output symbol stream of 109 to a physical resource RE.

111: IFFT: channel orthogonalization processing, mapping frequency domain signals to time domain signals.

112: Antenna: transmit the radio frequency signal power output by the wireless transmitter in the form of electromagnetic waves.

Another block diagram of the transmitter of the present invention is shown in Figure 1 (b):

200: Existing variable-length LTE DCI information bit generator: the eNB generates a control information bit stream according to a high-level scheduling instruction.

201: Encoder 1: used for channel encoding the output bit stream of the module 100. It contains two submodules:

201-0: CRC check bit generator: used to generate CRC check bits according to the information bit stream, and append them at the end of the information bits;

201-1: truncated convolutional encoder: used to perform truncated convolutional encoding on the output bitstream of module 101-0;

202: Rate matcher: Assume that the physical resources available for the entire control symbol are T resource elements (Resource Element, RE), and the number of REs occupied by AI information bits is L, then the rate matcher determines the transmission in this frame according to the value of T-L The number of bits and the rate matching of the concatenated bit stream S is performed according to the existing LTE rate matching principle.

For the convenience of subsequent description, it is assumed that the length of the output information bit stream of encoder 1 is A, expressed as:

D={d ₀ , d ₁ ..., d _A-1 }

203: The AI domain information bit generator in the present invention: the eNB independently generates AI information bits according to the scheduling information for the non-Anchor CC.

204: Encoder 2: used for channel encoding the output bit stream of module 102, the principle is that the encoding method adopted is more reliable than the encoding method of encoder 1, for example, repeated encoding is used.

For the convenience of subsequent description, it is assumed that the length of the output information bit stream of encoder 2 is H, expressed as:

A={a ₀ , a ₁ ,..., a _H-1 }

205: The bit concatenator performs bit concatenation on the output of the module 202 and the output bit stream of the module 204 according to the order shown in FIG. 7 ,

S={A, D}={a ₀ , a ₁ , ..., a _H-1 , d ₀ , d ₁ , ..., d _A-1 }

206: Scrambler: The eNB generates a scrambling code according to its own cell ID (cell-ID), and scrambles the output bit stream of 105, so as to eliminate interference among multiple cells.

207: Modulator: Map the output bit stream of 106 into signal points in the signal constellation

208: layer mapper: map the output symbol stream of 107 into multiple parallel data bit streams.

209: Precoder: perform pre-weighting processing on the data symbol stream of 108 to reduce the influence of the channel on the data.

210: resource mapper: map the output symbol stream of 109 to the physical resource RE.

211: IFFT: channel orthogonalization processing, which maps frequency domain signals to time domain signals.

212: Antenna: transmit the radio frequency signal power output by the wireless transmitter in the form of electromagnetic waves.

The present invention includes a non-Anchor CC DCI distribution indication method with low energy consumption, and the specific process is shown in Figure 3:

Step 300: The eNB generates and sends downlink control information DCI on the Anchor CC and the non-Anchor CC respectively.

Step 301: The UE searches for the DCI information sent by the eNB in the Anchor CC area of each downlink subframe and only in the search space of its own node

Step 302: According to the analysis of each subfield information bit in the new format DCI domain sent by the eNB on the Anchor CC, the UE closes the corresponding non-Anchor CC radio frequency channel within a certain period of time; Whether it is necessary to detect whether there is DCI information on each non-Anchor CC in the frame.

The present invention includes a timing indication relationship, as shown in Figure 2, the AI field in the DCI sent on the nth subframe Anchor CC is used to indicate whether to send DCI on the non-Anchor CC starting from (n+K), The value of K is included in the system information by the eNB and broadcast in the whole cell.

The present invention includes a new DCI format used in the LTE-A system, which is only used when the eNB sends downlink control information to the Anchor CC of the LTE-A UE. In the present invention, the new DCI format includes two parts: the first part is called the assignment indication field (AI field, Assignment Indication), which is used for the eNB to display or implicitly inform the LTE-A UE whether the subsequent non-Anchor CC will Send DCI information; the second part is the variable-length DCI information existing in the LTE system. In order to ensure the reliability of the AI domain, the AI domain adopts a coding scheme different from that of the existing DCI format, such as adopting a repetition coding scheme similar to the PCFICH channel in the LTE system. The essence of the present invention is to add an AI domain to the existing LTE DCI format, which is used to indicate the transmission of DCI on the non-Anchor CC after K subframes, so that the UE can decide whether to Turn off or turn on multiple RF channels to reasonably reduce power consumption. The method of reducing energy consumption of nodes based on the above method of adding an independent field outside the existing DCI format is within the protection scope of the present invention.

In the present invention, the AI domain includes two subfields: the non-Anchor CC indication subfield and the Duration indication subfield, as shown in FIG. 7 .

The duration indication subfield is used to indicate to the UE that when the non-Anchor CC indication subfield takes effect, the validity period T of the non-Anchor CC indication subfield is valid. As shown in Figure 8. In order to reduce the indication overhead of the system, the system configures F values for duration indication: T∈{T ₀ , T ₁ , T ₂ ,...,T _F-1 }, then the number of bits in the duration indication field is M=log ₂ F, the eNB indicates the specific value of the UE duration by sending the duration index value, and the specific mapping relationship is shown in FIG. 9 .

According to the different number of bits and physical meanings of non-Anchor CC indication sub-fields, the present invention also includes two indication sub-methods of DCI on non-Anchor CC, one is called implicit indication method; the other is called explicit Indicates the method. In the two sub-methods, the indication method of the duration indication sub-field is the same.

In the implicit indication sub-method, the non-Anchor CC indicates that the subfield information bit length is L=1, that is, the non-Anchor CC indicates that the subfield is {b ₀ }, and the specific physics is as follows: Assume that the eNB is in the nth subframe Anchor The DCI information is sent on the CC, then b ₀ =1 means that the eNB has sent DCI information on at least one non-Anchor CC in the n+Kth subframe, and the UE needs to perform blind DCI detection on each non-Anchor CC; b ₀ =0 means that no DCI information is sent on all non-Anchor CCs in the n+Kth subframe, and the UE can turn off radio frequency channels of all non-Anchor CCs in this subframe to reduce energy consumption.

The specific flow of the implicit indication method in the present invention is shown in Figure 10:

Step 1000: The eNB decides whether to generate a new DCI in the nth subframe and send it on the UE Anchor CC according to the scheduling requirements. The detailed process of generation is the same as sub-step 300-0 to sub-step 300-3 in FIG. 3 , and the specific data bit stream processing flow is shown in FIG. 1 .

Step 1001: The UE performs blind detection in its own search space on the Anchor CC, and detects whether the eNB sends downlink control information DCI in a new format on the non-Anchor CC in this subframe.

Steps 1002 to 1007 described below are specific implementation methods of step 202 in the corresponding system block diagram 2 in the implicit indication method:

Step 1002: The UE first only detects whether the eNB on the Anchor CC sends DCI information in a new format in each downlink subframe.

Step 1003: If the UE detects the DCI information sent by the eNB on the Anchor CC, the UE reads the value {b ₀ } of the non-Anchor CC indication subfield information bit in the DCI information and checks whether the bit is 1;

Step 1004: If the value {b ₀ } of the subfield information bit indicated by the non-Anchor CC is 1, then the UE flag needs to perform DCI blind detection in the search space of all non-Anchor CCs in the n+Kth subframe, specifically The method is to set the DCI detection switch: Key(n+K)=True; wherein in all subframes, the default setting of the DCI detection switch system is false.

The UE reads and records the information of the time length indication subfield in the AI domain in the DCI information on the Anchor CC. This information indicates the valid duration of the DCI detection result of the n+K subframe. It is assumed that the information in this information field is T.

Step 1005: The UE judges whether the current subframe has been marked as requiring blind detection of the non-Anchor CC, that is, whether Key(n) is true (True).

Step 1006: If the current frame is marked as requiring blind detection on non-Anchor CCs, the UE performs blind detection on all non-Anchor CCs to search for DCI information of its own node.

Step 1007: The UE closes all non-Anchor channels until the subsequent subframe marked by the first UE that requires blind detection. That is, all non-AnchorCC radio frequency channels are turned off to the n+g subframe, where g satisfies the following conditions:

Key(n+c)=false; 0<c<g

Key(n+g)=true

The UE needs to open all non-Anchor CC channels in the n+g subframe.

In the display indication method, the eNB divides non-Anchor CCs into multiple groups in advance, and the number W (W≥1) and mapping relationship of non-Anchor CCs in each group are known by eNB and UE. For the convenience of description, the symbol I is used to represent the number of non-Anchor CC groups, and the information bit length of the non-Anchor CC indication subfield is L=I, as shown in Figure 11, then:

non-Anchor CC indication subfield = {b ₀ , b ₁ , b ₂ ,..., b _L-1 }

Among them, if the eNB sets the bit in the AI field of the nth subframe: b _i = 1 (0≤i≤L-1), it means that the DCI is sent on the i-th non-Anchor group of the n+Kth subframe information, the corresponding DCI detection switch needs to be turned on; otherwise, b _i = 0 (0≤i≤L-1) means that the DCI detection switch of the i-th non-Anchor group in the n+K subframe is not required in this subframe do anything.

The specific flow of the display indicator sub-method in the present invention is shown in Figure 12:

For the convenience of description, in this method, Key(a, b) represents the value of the DCI detection switch in the bth non-Anchor CC group in the ath subframe, and the default setting of all non-Anchor CC group systems in all subframes is false.

Step 1200: The eNB decides whether to generate a new DCI in the nth subframe and send it on the UEAnchor CC according to the scheduling requirements. The detailed process of generation is the same as sub-step 300-0 to sub-step 300-3 in FIG. 3 . The specific bit-level processing flow is shown in FIG. 1 .

Step 1201: The UE performs blind detection in its own search space on the Anchor CC to detect whether the eNB has sent a new DCI, and the UE sets the detection switches of all non-Anchor CC groups to false by default, that is: Key (all subframes, All non_Anchor CC) = false.

Steps 1202 to 1214 described below are specific implementation methods of step 302 in the corresponding system block diagram 3 in the explicit indication method:

Step 1202: UE first only detects whether the eNB on the Anchor CC sends DCI information with a new format in each downlink subframe

Step 1203: If the UE detects the DCI information sent by the eNB on the Anchor CC, the UE reads the value of the duration indication subfield in the DCI information, assuming that the value is T.

Step 1204: UE sets the counter value j=0;

Step 1205: The UE reads the bit information of the non-AnchorCC indication subfield of the specific format DCI information detected on the Anchor CC: {b _j }, and judges whether b _j is equal to 1.

Step 1206: If b _j is equal to 1 and Key(n+m, j)=false, the two conditions of UE are satisfied at the same time, the UE sets:

Key(n+m, j)=true, m=K, ..., K+T-1

To identify that the UE needs to search each CC in the j-th non-Anchor CC group for T consecutive subframes starting from the n+K subframe, and detect the DCI sent by the eNB in the search space of each CC node.

Step 1207: The UE turns off the radio frequency channel of the j-th non-Anchor CC group from the n+1th subframe until the next subframe that needs to detect the j-th non-Anchor CC group, that is, to the g-th subframe, where g Meet the following conditions:

Key(g, j)=true, where g>n, and Key(c, j)=false, n<c<g

Step 1208: UE determines whether all non-Anchor CC groups have been traversed;

Step 1209: If not all non-Anchor CCs have been traversed, then the counter j=j+1, and repeat steps 1205 to 1208.

Step 1210: UE sets the counter value f=0;

Step 1211: The UE judges whether the detection switch of the fth non-Anchor CC in the current subframe is turned on, that is, whether Key(n, f)=true holds true.

Step 1212: UE performs detection on each CC in the f-th non-Anchor CC group, and searches for DCI information of this node.

Step 1213: UE judges whether all non-Anchor CC groups have been traversed.

Step 1214: If not all non-Anchor CC groups have been traversed, the counter f=f+1, and steps 1211 to 1213 are repeated.

Step 1215: End the process.

Example

The specific embodiments of the implicit indication sub-method and the display indication method in the technical solution according to the present invention are described below with reference to FIG. 13 and FIG. 14 . In the following description, a detailed description of well-known functions is omitted for clarity and conciseness.

In the following description, it is assumed that:

The AI field in the DCI sent on the nth subframe Anchor CC is used to indicate whether to send DCI on the non-Anchor CC starting from (n+K), in this example K=4;

The entire LTE-A system contains G+1 CCs, including 1 Anchor CC and G non-Anchor CCs, which are divided into M non-Anchor CC groups. In this embodiment, G=4, M= 2; where non-Anchor CC group 0 is {non-Anchor CC0, non-Anchor CC1}; non-Anchor CC group 1 is {non-Anchor CC2, non-Anchor CC3}.

The value of the duration indication subfield in the AI field in the special DCI format is: T∈{T ₀ , T ₁ , T ₂ ,..., T _F-1 }, in this embodiment F=2; T ₀ = 10; T ₁ = 20 or F = 0, that is, the special DCI format does not include the duration indication subfield, but only includes the non-Anchor CC indication subfield.

First embodiment:

This embodiment is suitable for the eNB to use the implicit indication sub-method to instruct the UE to timely and accurately close the non-Anchor CC radio frequency channel without DCI information transmission, which reduces the energy consumption of the UE while ensuring the system performance, and prolongs the standby time of the UE . In this embodiment, it is assumed that, as shown in FIG. 13 , the DCI detection switching system of all subframes is initialized to be off, that is, Key (all subframes)=false. Step 1000: The eNB generates and sends special DCI bit information in the nth subframe to indicate to the UE that it needs to open all radio frequency channels of non-Anchor CCs in the n+4 subframe for DCI blind detection. In this embodiment n=5;

The generated DCI information bits are as follows: the length of the duration indication subfield is log ₂ F=log ₂ 2=1 bit. In this embodiment, T=10, so the information bits of the duration indication subfield are {d ₀ }, d ₀ =0; the information of the non-Anchor CC indication subfield is b ₀ =1. The eNB divides the information bits according to the figure 7 are cascaded together, and then the information bits are mapped to the space of the UE in the Anchor CC according to the methods in Fig. 1 and Fig. 3 .

Step 1001: The UE performs blind detection in its own search space on the Anchor CC of the fifth subframe to detect whether the eNB has sent DCI information.

Step 1002: the UE detects that the eNB sends DCI information in the fifth subframe.

Step 1003: After decoding, the UE judges whether the information bit of the non-Anchor CC indication subfield is "1", that is:

Whether b ₀ =1 holds true.

Step 1004: The UE parses out: b ₀ =1; then the UE flag needs to perform DCI blind detection in the search space of all non-Anchor CCs in the n+K=5+4=9th subframe; at the same time, the UE analyzes the AI field The medium duration indicates the information of the subfield. In this embodiment, the information bit is {d ₀ }, d ₀ =0, then the UE knows the validity period T=10; the UE marks from the 9th subframe to the 9th+T=9+ 10=19 subframes (excluding the 19th subframe) need to always open the radio frequency channels of all non-Anchor CCs, namely:

Key(i)=true where i=9, 10, 11,...18

Step 1005: The UE checks whether there is a valid non-Anchor CC detection configuration, that is, the UE checks whether the current subframe DCI detection switch is turned on, and whether Key(n)=Key(5)=true is established.

Step 1006: Since Key(n)=Key(5)=true does not hold in this embodiment, step 906 does not need to be executed.

Step 1007: The UE detects the first subframe number a in which the DCI detection switch is turned on in the future, and turns off all non-Anchor CCs from the next subframe until subframe a (not including subframe a). In this embodiment, a=9, so the UE closes radio frequency channels of all non-Anchor CCs until subframe 9.

Second embodiment:

This embodiment is suitable for the eNB to use the implicit indication submethod to instruct the UE to timely and accurately close the non-Anchor CC radio frequency channel without DCI information transmission. In this example, as shown in Figure 13, it is assumed that the eNB sends DCI in the fifth subframe to instruct the UE to set the DCI detection switch to true (True), and the UE completes the corresponding settings (the process is as in Embodiment 1); Frame 17 sends DCI again to instruct UE to set the DCI detection switch to true (True), the specific steps are as follows:

Step 1000: The eNB generates and sends special DCI bit information in the nth subframe to indicate to the UE that it needs to open all radio frequency channels of non-Anchor CCs in the n+4 subframe for DCI blind detection. In this embodiment n=17;

The generated DCI information bits are as follows: the length of the duration indication subfield is log ₂ F=log ₂ 2=1 bit. In this embodiment, T=10, so the information bits of the duration indication subfield are {d ₀ }, d ₀ =0; the information of the non-Anchor CC indication subfield is b ₀ =1. The eNB divides the information bits according to the figure 7 are cascaded together, and then the information bits are mapped to the space of the UE in the Anchor CC according to the methods in Fig. 1 and Fig. 3 . Step 1001: The UE performs blind detection in its own search space on the Anchor CC of the 17th subframe to detect whether the eNB has sent DCI information.

Step 1002: the UE detects that the eNB sends DCI information in the 17th subframe.

Step 1003: After decoding, the UE judges whether the information bit of the non-Anchor CC indication subfield is "1", that is:

Whether b ₀ =1 holds true.

Step 1004: The UE parses out: b ₀ =1; then the UE flag needs to perform DCI blind detection in the search space of all non-Anchor CCs in the n+K=17+4=21th subframe; at the same time, the UE analyzes the AI field The medium duration indicates the information of the subfield. In this embodiment, the information bit is {d ₀ }, d ₀ =0, then the UE knows the validity period T=10; the UE marks from the 17th subframe to the 17th+T=17+ 10=27 subframes (excluding the 27th subframe) need to always open the radio frequency channels of all non-Anchor CCs, namely:

Key(i)=true where i=17, 10, 11,...26

Step 1005: The UE checks whether there is a valid non-Anchor CC detection configuration, that is, the UE checks whether the current subframe DCI detection switch is turned on, and whether Key(n)=Key(17)=true is established.

Step 1006: Since Key(n)=Key(17)=true holds true in this embodiment, the UE needs to traverse all non-Anchor CCs to detect whether the eNB has sent DCI information on some non-Anchor CCs.

Step 1007: The UE detects the first subframe label a in which the DCI detection switch is turned on in the future, and turns off all non-Anchor CCs from the next subframe until subframe a (not including subframe a). In this embodiment, a = 18, so the UE does not have any operation to close the non-Anchor CC radio frequency channel.

third embodiment

This embodiment is applicable to the eNB adopting an explicit indication sub-method to instruct the UE to timely and accurately close the radio frequency channel of the non-Anchor CC group that does not send DCI information. In this embodiment, it is assumed that, as shown in FIG. 14 , the DCI detection switching system of all subframes is initialized to be off, that is, Key (all subframes, all non-Anchor CC groups)=false.

Step 1200: The eNB generates and sends special DCI bit information in the nth subframe to indicate to the UE that it needs to open the radio frequency channels of all CCs in a certain non-Anchor CC group in the n+4 subframe for DCI blind detection. n=5 in the present embodiment;

The generated DCI information bits are as follows: the length of the duration indication subfield is log ₂ F=log ₂ 2=1 bit. In this embodiment, T=10, so the information bits of the duration indication subfield are {d ₀ }, d ₀ =1; the information bit length of the non-Anchor CC indication subfield is L=M=2; the information in the domain The bits are {b ₀ , b ₁ }, since the eNB instructs the UE in subframe 5 to open the radio frequency channel of non-Anchor CC group 0 in the corresponding subframe; then the corresponding bit is set to:

b ₀ =1; b ₁ =0.

The eNB concatenates the information bits according to Figure 7, and then maps the information bits to the space of the UE in the Anchor CC according to the methods shown in Figure 1 and Figure 3.

Step 1201: The UE performs blind detection in its own search space on the Anchor CC of the fifth subframe to detect whether the eNB has sent DCI information.

Step 1202: the UE detects that the eNB sends DCI information in the fifth subframe.

Step 1203: The UE reads the bit information {d ₀ } of the duration subfield of the DCI AI field. In this implementation, d ₀ =0, then the UE learns that the validity period of the DCI switch is T=10.

Step 1204: UE sets counter j=0.

Step 1205: The UE judges the information bits of the subfield indicated by the non-Anchor CC in the AI field of the DCI information:

Whether b _j =1 holds true. If established, go to step 1206, otherwise go to step 1207.

In this embodiment, the expression is established, and the UE enters step 1206 .

Step 1206: In this example, b ₀ =1. Then the UE marks T=10 consecutive subframes starting from subframe n+K=5+4=9, and the UE needs to enable the DCI detection of the jth non-Anchor CC group switch, the specific implementation method is:

Key(i, j) = true; i = 9, 10, 11, 12, 13, ..., 18

Step 1207: The UE detects the first subframe label a in which the DCI detection switch is turned on in the future, and turns off all non-Anchor CCs from the next subframe until subframe a (not including subframe a). In this embodiment, a =9, so the UE closes all CC radio channels of the non-Anchor CC group j until subframe 9. Step 1208: UE judges whether all non-Anchor CC groups have been traversed, that is, whether j<M-1 is established; if it is established, enter step 1109; otherwise, enter step 1110;

Step 1209: The counter j is accumulatively increased by 1; that is, the following operation is performed: j=j+1; Steps 1205-1207 are repeatedly executed.

Step 1210: UE sets counter f=0.

Step 1211: The UE detects whether the detection switch of the fth non-Anchor CC in the current subframe is turned on, that is, whether the expression: Key(n, f)=true holds true. If established, go to step 1212; otherwise, go directly to

Step 1213: In this embodiment, when f=0, the above condition is not established, so go to step 1213.

Step 1212: The UE searches for each CC in the fth non-Anchor CC group in the current subframe, and detects whether the eNB sends DCI information.

Step 1213: UE increments the counter by one, that is, f=f+1.

Step 1214: UE judges whether all non-Anchor CC groups have been traversed, that is, whether the expression f<M-1=2-1=1 holds true, and M is the number of non-Anchor CC groups in the system. If true, enter step 1215; otherwise, start from step 1211 to execute again.

Step 1215: end.

Fourth embodiment

This embodiment is applicable to the eNB adopting an explicit indication sub-method to instruct the UE to timely and accurately close the radio frequency channel of the non-Anchor CC group that does not send DCI information. In this embodiment, it is assumed that as shown in Figure 14, the DCI detection switch system of all subframes is initialized to an off state, that is, Key (all subframes, all non-Anchor CC groups)=false: and in this example, it is assumed The third embodiment has occurred.

Step 1200: The eNB generates and sends special DCI bit information in the nth subframe to indicate to the UE that it needs to open the radio frequency channels of all CCs in a certain non-Anchor CC group in the n+4 subframe for DCI blind detection. n=12 in the present embodiment;

The generated DCI information bits are as follows: the length of the duration indication subfield is log ₂ F=log ₂ 2=1 bit. In this embodiment, T=10, so the information bits of the duration indication subfield are {d ₀ }, d ₀ =1; the information bit length of the non-Anchor CC indication subfield is L=M=2; the information in the domain The bits are {b ₀ , b ₁ }, since the eNB instructs the UE in subframe 12 to open the radio frequency channel of non-AnchorCC group 1 on the corresponding subframe in this embodiment; then the corresponding bits are set to:

b ₀ =0; b ₁ =1.

The eNB concatenates the information bits according to Figure 7, and then maps the information bits to the space of the UE in the AnchorCC according to the methods shown in Figure 1 and Figure 3 .

Step 1201: The UE performs blind detection in its own search space on the Anchor CC of the 12th subframe to detect whether the eNB has sent DCI information.

Step 1202: the UE detects that the eNB sends DCI information in the 12th subframe.

Step 1203: The UE reads the bit information {d ₀ } of the duration subfield of the DCIAI field. In this implementation, d ₀ =0, then the UE learns that the validity period of the DCI switch is T=10.

Step 1204: UE sets counter j=0.

Step 1205: The UE judges whether the information bit of the non-Anchor CC indication subfield in the AI field of the DCI information: b _j =1 is established. If it is established, go to step 1206; otherwise, go to step 1207. In this example, b ₀ =0, the UE does not need to perform any operation on the DCI detection switch Key, and goes to step 1207 directly.

Step 1206: If b _j =1 is established. The UE needs to mark T=10 consecutive subframes starting from subframe n+K=5+4=9, and the UE needs to turn on the DCI detection switch of the jth non-Anchor CC group. The specific implementation method is as follows:

Key(i, j) = true; i = 16, 17, 18, 19, 20, ..., 25

Step 1207: The UE detects the subframe label a in which the first DCI detection switch is turned on in the future, and turns off all non-Anchor CCs from the next subframe until subframe a (not including subframe a). In this embodiment, when When j=0, a=13, so the UE cannot turn off the radio frequency channel of non-Anchor CC group 0; and when j=1, a=16, so when j=1, the UE can turn off the radio frequency channel of non-Anchor CC group 1 RF channel up to subframe 16.

Step 1208: UE judges whether all non-Anchor CC groups have been traversed, that is, whether j<M-1=1 is established; if it is established, enter step 1209; otherwise, enter step 1210;

Step 1209: The counter j is accumulatively increased by 1; that is, the following operation is performed: j=j+1; Steps 1205-1207 are repeatedly executed.

Step 1210: UE sets counter f=0.

Step 1211: The UE detects whether the detection switch of the fth non-Anchor CC in the current subframe is turned on, that is, whether the expression: Key(n, f)=true holds true. If established, go to step 1212; otherwise, go directly to

Step 1213 ; in this embodiment, when f=0, the above condition is true, so go to step 1212 ; and when f=1, the above condition is not true, so go directly to step 1213 .

Step 1212: The UE searches for each CC in the fth non-Anchor CC group in the current subframe, and detects whether the eNB sends DCI information.

Step 1213: UE increments the counter by one, that is, f=f+1.

Step 1214: UE judges whether all non-Anchor CC groups have been traversed, ie

Whether the expression f<M-1=2-1=1 holds true, M is the number of non-Anchor CC groups in the system. If true, enter step 1215; otherwise, start from step 1211 to execute again.

Step 1215: end.

Claims (36)

1. A sending method for downlink control channel PDCCH distribution in LTE-A system, comprising steps: a. The eNB divides the carrier element CC into the anchor carrier element Anchor CC and the non-anchor carrier element non-Anchor CC for the UE; b. The eNB generates and sends downlink control information DCI on the Anchor CC of the UE; c. The eNB decides whether to send the existing LTE DCI information on the non-Anchor CC of the UE according to the business and scheduling requirements; d. The UE searches for the DCI information sent by the eNB in its own search space on the Anchor CC of the local node in each downlink subframe; e. UE closes the corresponding non-Anchor CC radio frequency channel within a certain period of time according to the analysis of the subfield information bits in the DCI sent by the eNB on the Anchor CC and the specific indication timing relationship, and determines the non-Anchor CC to be detected index. 2. The method according to claim 1, wherein in step a, different UEs have different Anchor CCs and non-Anchor CCs. 3. The method according to claim 1, wherein in step b, the downlink control information DCI includes two parts: the first part is the allocation indicator domain AI domain, which is used for the eNB to notify the UE whether the DCI will be sent on the subsequent non-Anchor CC information; the second part is the variable-length DCI information existing in the LTE system. 4. The method according to claim 1, wherein in step e, the specific indication timing relationship refers to that the AI domain of the DCI sent on the nth subframe Anchor CC is used to indicate the non from the (n+K)th -Whether to send DCI on the Anchor CC, the value of K is included in the system information by the eNB and broadcast in the entire cell. 5. The method according to claim 1, wherein in step e, the UE determines the duration of closing the non-Anchor CC radio frequency channel according to the value of the DCI detection switch and determines the non-Anchor CC index to be detected, all subframes The DCI detection switch is off when the system is initialized. 6. The method according to claim 3, wherein the AI domain of the downlink control information DCI and the existing variable-length DCI information of the LTE system adopt independent coding schemes. 7. The method according to claim 3, wherein the AI field of the special format downlink control information DCI is composed of two subfields: the non-Anchor CC indication subfield and the duration (Duration) indication subfield, wherein the duration indication subfield represents The non-Anchor CC in the same DCI information indicates the validity period of the subfield. 8. The method according to claim 7, wherein whether the duration indication subfield exists depends on system configuration. 9. The method according to claim 7, wherein the bit length of the duration indication subfield is M=log ₂ F, where F is the number of validity periods of the non-Anchor CC indication subfield configured by the system, that is, the non-Anchor CC available to the system. Anchor CC is valid for: T={T ₀ , T ₁ , T ₂ ,..., T _F-1 } The period T _F-1 is mapped to the binary value of F-1, and is sent to the UE through the duration indication subfield. 10. The method according to claim 7, wherein the bit indication method in the non-Anchor CC subfield comprises an implicit indication sub-method. 11. The method according to claim 10, wherein in the implicit indication sub-method, the non-Anchor CC indication sub-field information bit length is 1, which is represented by {b ₀ }. 12. The method according to claim 11, wherein in the implicit indication sub-method, the UE will detect the value of the DCI detection switch of the current subframe in each downlink subframe, and decide according to the value of the DCI detection switch of the current subframe Whether to perform blind detection on all non-Anchor CCs in the current subframe. 13. The method according to claim 11, wherein in the implicit indication sub-method, after the end of DCI detection in each downlink subframe, the UE will decide whether to turn off all The non-Anchor CC RF channel. 14. The method according to claim 7, wherein the bit indication method in the non-Anchor CC sub-field includes a display indication sub-method. 15. The method according to claim 14, wherein in the explicit indication sub-method, the eNB first divides non-Anchor CCs into M groups. 16. The method according to claim 11, wherein if the UE receives the information of the non-Anchor CC indication subfield in the DCI in the nth subframe: "b ₀ = 1", the duration indication subfield in the same DCI The duration information is T, then the UE will turn on the DCI detection switch of T consecutive subframes starting from the n+Kth subframe: Key(i)=true, i=n+K, n+K+1,..., n+K+T-1 In the formula: Key(i) represents the DCI detection switch value of the i-th subframe. 17. In the method according to claim 12, wherein if the UE checks and finds that the DCI detection switch is turned on in the nth subframe, that is, Key(n)=true, the UE will search space of all non-Anchor CC nodes Perform blind detection and receive DCI information sent by the eNB. If Key(n)=false, the UE does not need to perform blind detection on non-Anchor CCs. 18. The method according to claim 13, the UE closes all non-Anchor CC radio frequency channels until the ath subframe, where a satisfies the following conditions: Key(c)=false; n<c<a; Key(a)=true. In the formula: Key(c) represents the DCI detection switch value of the cth subframe. 19. The method according to claim 14, wherein in the display indication method, the non-Anchor CC indication subfield information bit length is M, where M is the number of non-Anchor CC groups. 20. The method according to claim 19, the non-Anchor CC indicates that the subfield information bits are expressed as: non-Anchor CC indicates subfield information bits = {b ₀ , b ₁ , b ₂ ,..., b _M-1 } Then the bits {b _i } (0≤i≤M-1) are used to indicate the i-th non-Anchor CC group; if the UE receives the special DCI information in a special format, and b _i =1, the duration information of the duration indication subfield in the same DCI is T; then the UE needs to set subframe n+K The DCI detection switch of the i-th non-Anchor CC group is turned on, that is, Key(i, j)=true; i=n+K, n+K+1, n+K+2,..., n+K+T-1 In the formula, Key(o, p) represents the value of the detection switch of the pth non-Anchor CC group in the oth subframe. 21. The method according to claim 20, after the end of DCI detection in each downlink subframe, the UE will decide whether to switch from The non-Anchor CC radio frequency channel will be turned off in the next subframe. 22. The method according to claim 21, the UE turns off the pth non-Anchor CC radio frequency channel until the ath subframe, where a satisfies the following conditions: Key(c,p)=false; n<c<a; Key(a,p)=true. In the formula: Key(c, p) represents the DCI detection switch value of the pth non-Anchor CC group in the cth subframe. 23. A device for sending a downlink control channel PDCCH in an LTE-A system, comprising: LTE DCI information bit generator, the output information bit stream enters encoder 1; AI domain information bit generator, the output information bit stream enters encoder 2; A bit concatenator, performing bit concatenation on the bit streams output by encoder 1 and encoder 2; The rate matcher determines the number of bits that can be transmitted in this frame according to the number of resource units of available physical resources and performs rate matching on the bit stream output by the bit concatenator according to the rate matching principle of LTE for the bit stream after cascading; The bit stream output by the rate matcher is processed and emitted by the antenna in the form of electromagnetic waves. 24. The transmitting device according to claim 23, wherein the LTE DCI information bit generator is an eNB generating a control information bit stream according to a high-layer scheduling instruction. 25. The sending device according to claim 23, wherein the encoder 1 comprises: CRC check bit generator, for generating CRC check bits according to the information bit stream; A truncated convolutional encoder performs truncated convolutional encoding processing on the bit stream output by the CRC check bit generator. 26. The sending device according to claim 23, wherein the AI field information bit generator is that the eNB independently generates AI information bits according to the scheduling information for non-anchor CCs. 27. The transmitting apparatus according to claim 23, wherein encoder 1 and encoder 2 use different encoding schemes. 28. The transmitting apparatus according to claim 27, wherein the encoding scheme of encoder 2 is more reliable than the encoding scheme of encoder 1 . 29. The method device according to claim 28, wherein the encoding method adopted by the encoder is repetition encoding. 30. A device for sending a downlink control channel PDCCH in an LTE-A system, comprising: LTE DCI information bit generator, the output information bit stream enters encoder 1; AI domain information bit generator, the output information bit stream enters encoder 2; The rate matcher determines the number of bits that can be transmitted in this frame according to the number of resource units of available physical resources and the number of resource units occupied by AI information bits, and performs rate matching on the concatenated bit stream according to the LTE rate matching principle match; A bit concatenator, which performs bit concatenation on the bit stream output by the rate matcher and the encoder 2; The bit stream output by the bit concatenator is processed and emitted by the antenna in the form of electromagnetic waves. 31. The sending device according to claim 30, wherein the LTE DCI information bit generator is an eNB generating a control information bit stream according to a high-level scheduling instruction. 32. The transmitting device according to claim 30, wherein the encoder 1 comprises: CRC check bit generator, for generating CRC check bits according to the information bit stream; A truncated convolutional encoder performs truncated convolutional encoding processing on the bit stream output by the CRC check bit generator. 33. The sending device according to claim 30, wherein the AI field information bit generator is that the eNB independently generates AI information bits according to the scheduling information for non-anchor CCs. 34. The transmitting apparatus according to claim 30, wherein encoder 1 and encoder 2 use different encoding schemes. 35. The transmitting apparatus according to claim 34, wherein the encoding scheme of encoder 2 is more reliable than the encoding scheme of encoder 1 . 36. The method device according to claim 35, wherein the encoding method adopted by the encoder is repetition encoding.

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