WO2013139307A1

WO2013139307A1 - E-pdcch transmitting and receiving method and device

Info

Publication number: WO2013139307A1
Application number: PCT/CN2013/073077
Authority: WO
Inventors: 吴强; 刘江华; 高驰
Original assignee: 华为技术有限公司
Priority date: 2012-03-22
Filing date: 2013-03-22
Publication date: 2013-09-26
Also published as: CN103326839A; CN103326839B

Abstract

The present invention relates to the technical field of communications. Provided in an embodiment of the present invention are an enhanced physical downlink control channel (E-PDCCH) transmitting and receiving method and device, aiming to effectively improve channel estimation performance. The E-PDCCH transmitting method comprises: determining an E-PDCCH to be transmitted to a user equipment (UE), the E-PDCCH comprising at least two logic control units; mapping the physical resource of the E-PDCCH according to the search space corresponding to the UE, such that the at least two logic control units are mapped onto the pair of at least two resource blocks (RB) of the same pre-encoded resource block group (PRG) in the search space; and transmitting the mapped E-PDCCH to the UE. The present invention can be used in wireless communication technologies.

Description

Enhanced physical downlink control channel transmission and reception method and device

This application claims priority to Chinese Patent Application No. 201210079259.0, entitled "Enhanced Physical Downlink Control Channel Transmission and Reception Method and Apparatus", filed on March 22, 2012, the entire contents of which are incorporated by reference. The citations are incorporated herein by reference. The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting and receiving an enhanced physical downlink control channel E-PDCCH (Enhanced Physical Downlink Control Channel). Background technique

In the Long Term Evolution (LTE) system of Release 10 and Release 10, the physical downlink control channel PDCCH (Physical Downlink Control Channel) and the Physical Downlink Shared Channel (PDSCH) are time-divided in one subframe. The PDCCH is carried in the first n symbols of one subframe, and the user equipment UE (UE equipment) demodulates the PDCCH based on the cell specific reference signal CRS (Common Reference Signal). A complete PDCCH consists of one or several CCEs (Control Channel Elements).

In the LTE system after Release 10, the introduction of technologies such as Multiple Input Multiple Output (MIMO) and Coordinated Multiple Point Transmission And Reception (CoMP) limits the control channel capacity. A PDCCH based on MIMO precoding is introduced, that is, an E-PDCCH. The E-PDCCH is not in the control region of the first n symbols of one subframe but in the region of the downlink data transmission of the subframe, and is frequency-divided with the PDSCH, and may be based on the UE-specific reference signal DM RS (Demodulation Reference Signal, solution) Adjust the reference signal) to demodulate. Each E-PDCCH is still composed of one or several logical control units similar to CCE.

In the prior art, when the base station transmits the E-PDCCH to the UE, the physical resource mapping of the E-PDCCH is usually performed by using a sequential mapping manner, but the performance of the channel estimation is compared. Poor. Summary of the invention

A main object of the embodiments of the present invention is to provide an E-PDCCH transmission and reception method and apparatus, which can effectively improve the performance of channel estimation. To achieve the above objective, the following embodiments of the present invention are used in the following aspects: The first aspect of the present invention provides a method for transmitting an enhanced physical downlink control channel E-PDCCH, where the method includes:

Determining an E-PDCCH that needs to be transmitted to the UE, where the E-PDCCH includes at least two logical control units;

Performing physical resource mapping of the E-PDCCH according to the search space corresponding to the UE, so that the at least two logical control units are mapped to the same precoding resource group PRG (Precoding Resource Group) in the search space. At least two physical resource blocks RB (Resource Block) pairs (RB pair ); the mapped E-PDCCH is sent to the UE.

In a first possible implementation manner of the first aspect, the number of the logical control units included in the E-PDCCH is the same as an aggregation level value of an E-PDCCH corresponding to the UE.

In a second possible implementation manner of the first aspect, after the physical resource mapping of the E-PDCCH is performed according to the search space corresponding to the UE, the sending the mapped E to the UE Before the PDCCH, the method further includes:

Performing precoding processing on the mapped E-PDCCH, where the mapping to the at least two logical control units on at least two physical RB pairs of the same PRG in the search space uses the same precoding method ;

The sending the mapped E-PDCCH to the UE includes:

In a third possible implementation manner of the foregoing aspect, the performing physical resource mapping of the E-PDCCH according to the search space corresponding to the UE includes: Performing a modulo operation on the at least two logical control units of the E-PDCCH to obtain a modulus value of each logical control unit; and performing the at least two according to the obtained modulus values of the logical control units The logical control unit is mapped to at least two physical RB pairs of the same PRG in the search space.

In a fourth possible implementation manner of the first aspect, in a search space corresponding to the UE, each PRG includes at least two physical resource locations, and each RB pair includes at least one physical resource location, each One of the logical control units can be mapped to the physical resource location;

The performing physical resource mapping of the E-PDCCH according to the search space corresponding to the UE includes:

Mapping the at least two logical control units of the E-PDCCH to the physical resource locations in the same PRG in the search space, where the mapped physical resource locations are distributed in the PRG At least two physical RB pairs. In conjunction with the first aspect or any one of the above various possible implementations of the first aspect, in a fifth possible implementation of the first aspect:

In the search space corresponding to the UE, n+1 logical control units can be mapped in each PRG, and the indexes of the n+1 logical control units are m to m+n, where m, n are integers.

In a fifth possible implementation manner of the first aspect, the E-PDCCH uses a resource unit corresponding to each logical control unit of the E-PDCCH to map a centralized transmission mode in a same physical RB pair;

The performing physical resource mapping of the E-PDCCH according to the search space corresponding to the user equipment includes:

Selecting a physical RB pair set for performing physical resource mapping of the E-PDCCH according to a search space corresponding to the user equipment;

Mapping the at least two logical control units of the E-PDCCH to at least two physical RBs in the selected set of physical RB pairs and located in the same precoding resource block group PRG in the search space match. In conjunction with the fifth possible implementation of the first aspect, in a sixth possible implementation of the first aspect:

Mapping at least two physics of the at least two logical control units of the E-PDCCH in the selected set of physical RB pairs and located in the same pre-coded resource block group PRG in the search space The RB is forwarded, and the method further includes:

Determining a mapping manner of the physical resource mapping of the E-PDCCH; mapping the at least two logical control units of the E-PDCCH to the selected physical RB pair set and located in the search At least two physical RB pairs in the same precoding resource block group PRG in the space include: according to the determined mapping manner, mapping the logical control unit of the E-PDCCH to the UE in the determined mapping manner Mapping the at least two logical control units of the E-PDCCH in the selected set of physical RB pairs and located in the search when at least two PRBs in the same PRG are in the search space At least two physical RB pairs in the same pre-coded resource block group PRG in the space; the method further includes: sending high-layer signaling to the user equipment, where the high-layer signaling indicates the mapping manner determined by the base station . A second aspect of the present invention provides an enhanced physical downlink control channel E-PDCCH connection method, where the method includes:

The UE receives the control information in the search space corresponding to the UE, where the control information includes an E-PDCCH that is sent by the base station to the UE, the E-PDCCH includes at least two logical control units, and the at least two The logical control unit is mapped by the base station to at least two physical resource block RB pairs of the same pre-coded resource block group PRG in the search space; the UE performs blind detection on the received control information to obtain The E-PDCCH. In a first possible implementation manner of the second aspect, the number of the logical control units included in the E-PDCCH is the same as an aggregation level value of an E-PDCCH corresponding to the UE.

In a second possible implementation of the second aspect: The mapping to the at least two logical control units on the at least two physical RB pairs of the same PRG in the search space uses the same precoding manner.

In a third possible implementation manner of the second aspect, the at least two logical control units included in the E-PDCCH are mapped by the base station to the same one in the search space according to a modulus value of each of the logical control units. At least two physical RB pairs of the PRG.

In a fourth possible implementation manner of the second aspect, in a search space corresponding to the UE, each PRG includes at least two physical resource locations, and each RB pair includes at least one physical resource location, each One of the logical control units can be mapped to the physical resource location;

The at least two logical control units of the E-PDCCH are respectively mapped to the physical resource locations in the same PRG in the search space, and the mapped physical resource locations are distributed in the PRG at least Two physical RB pairs.

With reference to the second aspect or any one of the foregoing various possible implementation manners of the second aspect, in a fifth possible implementation manner of the second aspect:

In the search space corresponding to the UE, n+1 logical control units can be mapped on each PRG, and the indexes of the n+1 logical control units are m to m+n, where m, n are integers.

In a fifth possible implementation manner of the second aspect, the E-PDCCH uses a resource unit corresponding to each logical control unit of the E-PDCCH to map a centralized transmission mode in a same physical RB pair; Before the user equipment receives the control information in the search space corresponding to the user equipment, the method further includes: the user equipment determining a physical RB pair set capable of performing physical resource mapping of the E-PDCCH; The receiving, by the user equipment, the control information in the search space corresponding to the user equipment includes:

Determining, by the user equipment, the physical resource capable of performing the E-PDCCH according to the determining The mapped physical RB pair set receives the control information in the search space corresponding to the user equipment.

In conjunction with the fifth possible implementation of the second aspect, in a sixth possible implementation of the second aspect:

Before the user equipment receives the control information in the search space corresponding to the user equipment, the method further includes: the user equipment receiving the high layer signaling sent by the base station, where the high layer signaling indicates the base station to the E a mapping mode of the PDCCH, where the user equipment receives the control information in the search space corresponding to the user equipment, including:

And the user equipment receives the control information in the search space corresponding to the user equipment according to the mapping manner of the base station to the E-PDCCH indicated by the high layer signaling. A third aspect of the present invention provides a base station, where the base station includes:

a determining unit, configured to determine an E-PDCCH that needs to be transmitted to the UE, where the E-PDCCH includes at least two logical control units, and a mapping unit, configured to perform, according to the search space corresponding to the UE, the E determined by the determining unit a physical resource mapping of the PDCCH, such that the at least two logical control units are mapped to at least two physical resource block RB pairs of the same pre-coded resource block group PRG in the search space; The UE transmits the E-PDCCH after the mapping unit mapping. In a first possible implementation manner of the third aspect, the number of the logical control units included in the E-PDCCH is the same as an aggregation level value of an E-PDCCH corresponding to the UE.

In a second possible implementation manner of the third aspect, the base station further includes: a coding unit, configured to perform precoding processing on the mapped E-PDCCH, where the mapping is performed in the search space At least two logical control units on at least two physical RB pairs of one PRG use the same precoding manner; then the sending unit is specifically configured to send the mapping to the UE and perform precoding processing E-PDCCH.

In a third possible implementation manner of the third aspect, the mapping unit is specifically configured to: perform a modulo operation on the at least two logical control units of the E-PDCCH, respectively, to obtain each logical control unit And modulating the at least two logical control units to at least two physical RB pairs of the same PRG in the search space according to the acquired modulus values of the logical control units.

With reference to the third aspect or any one of the foregoing various possible implementation manners of the third aspect, in a fourth possible implementation manner of the third aspect:

In the search space corresponding to the UE, each PRG includes at least two physical resource locations, each RB pair includes at least one of the physical resource locations, and each of the physical resource locations can map one of the logical control units ;

The mapping unit is specifically configured to: map the at least two logical control units of the E-PDCCH to the physical resource locations in the same PRG in the search space, where the mapped physical resources are mapped The locations are distributed over at least two physical RB pairs within the PRG.

In conjunction with the fourth possible implementation of the third aspect, in a fifth possible implementation of the third aspect:

A fourth aspect of the present invention provides a UE, where the device includes:

a receiving unit, configured to receive control information in a search space corresponding to the UE, where the control information includes an E-PDCCH that is sent by the base station to the UE, where the E-PDCCH includes at least two logical control units, and The at least two logical control units are mapped by the base station to at least two physical resource block RB pairs of the same pre-coded resource block group PRG in the search space; a blind detection unit is configured to receive the receiving unit The control information is blindly detected to obtain the E-PDCCH. In a first possible implementation manner of the fourth aspect, the number of the logical control units included in the E-PDCCH is the same as an aggregation level value of an E-PDCCH corresponding to the UE.

In a second possible implementation manner of the fourth aspect, the mapping to the at least two logical control units on the at least two physical RB pairs of the same PRG in the search space uses the same precoding manner.

In a third possible implementation manner of the fourth aspect, the at least two logical control units included in the E-PDCCH are mapped by the base station to the same one in the search space according to a modulus value of each of the logical control units At least two physical RB pairs of the PRG.

In a fourth possible implementation manner of the fourth aspect, in a search space corresponding to the UE, each PRG includes at least two physical resource locations, and each RB pair includes at least one physical resource location, each One of the logical control units can be mapped to the physical resource location;

The at least two logical control units of the E-PDCCH received by the receiving unit are respectively mapped to the physical resource locations in the same PRG in the search space, where the mapped physical resource locations are distributed. At least two physical RB pairs within the PRG.

With reference to the fourth aspect or any one of the foregoing various possible implementation manners of the fourth aspect, in a fifth possible implementation manner of the fourth aspect:

According to a fifth aspect of the present invention, a base station is provided, where the base station includes:

Processor, memory, communication interface, and bus;

The processor, the memory and the communication interface are connected by the bus and complete communication with each other; the memory is configured to store executable program code;

The processor operates by reading executable program code stored in the memory The program corresponding to the executable program code is configured to: determine an E-PDCCH that needs to be transmitted to the user equipment, where the E-PDCCH includes at least two logic control units; according to the search space corresponding to the user equipment, perform the Mapping the physical resource mapping of the E-PDCCH, so that the at least two logical control units are mapped to at least two physical resource block RB pairs of the same precoding resource block group PRG in the search space; to the user equipment Sending the mapped E-PDCCH. A sixth aspect of the present invention provides a user equipment, including:

Processor, memory, communication interface, and bus;

The processor, by reading the executable program code stored in the memory, to run a program corresponding to the executable program code, to: receive control information in a search space corresponding to the user equipment, The control information includes an E-PDCCH that is sent by the base station to the user equipment, where the E-PDCCH includes at least two logical control units, and the at least two logical control units are mapped by the base station to the search space. At least two physical resource block RB pairs of the same precoding resource block group PRG;

Performing blind detection on the received control information to obtain the E-PDCCH.

The method for transmitting and receiving an E-PDCCH, the base station, and the UE provided by the embodiment of the present invention, at least two logical control units of the E-PDCCH are mapped to at least two RB pairs, so at least two mapped maps may be used. The RB pair performs joint channel estimation, which effectively improves the performance of channel estimation. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate embodiments of the present invention or prior art solutions, BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set forth in the description of the claims Other drawings can also be obtained from these drawings on the premise of creative labor. FIG. 1 is a flowchart of a method for transmitting an E-PDCCH according to an embodiment of the present invention; FIG. 2( a ) is a schematic diagram showing an example of a mapping manner in the sending method shown in FIG. 1 ; 1 is another schematic diagram of a mapping manner in a transmitting method shown in FIG. 1; FIG. 3 is a schematic diagram showing an example of a search space in the transmitting method shown in FIG. 1;

4 is a flowchart of a method for receiving an E-PDCCH according to an embodiment of the present invention; FIG. 5 is a structural block diagram of a base station according to an embodiment of the present invention;

FIG. 6 is a block diagram of another structure of a base station according to an embodiment of the present invention; FIG. 7 is another structural block diagram of a UE according to an embodiment of the present invention;

FIG. 8 is a block diagram of still another structure of a UE according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a PRB pair set in a method for transmitting an E-PDCCH according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a mapping manner of a PRB pair set shown in FIG. 8 in an E-PDCCH sending method according to an embodiment of the present disclosure;

11 (a) and (b) are schematic diagrams showing an example of a mapping manner in a case where a PRG includes three PRB pairs and an aggregation level is 2 in the method for transmitting an E-PDCCH according to an embodiment of the present invention;

12 (a) and (b) are schematic diagrams showing an example of a mapping manner in a case where a PRG includes three PRB pairs and an aggregation level is 4 in the method for transmitting an E-PDCCH according to an embodiment of the present invention;

FIG. 13 is a block diagram showing another structure of a base station according to an embodiment of the present invention;

FIG. 14 is a structural block diagram of still another UE according to an embodiment of the present invention.

detailed description The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention. In order to enable those skilled in the art to better understand the technical solution of the present invention, the "RB pair" involved in the present invention will be briefly introduced.

According to the LTE Release 8/9/10 standard, a normal downlink subframe includes two slots (slots), and each slot has 7 OFDM (Orthogonal Frequency Division Multiplexing) symbols, one A normal downlink subframe has a total of 14 or 12 OFDM symbols; one RB has 12 subcarriers in the frequency domain, and has a half subframe duration (one slot) in the time domain, that is, contains 7 or 6 OFDM symbols. The normal CP (Cyclic Prefix) has a length of 7 OFDM symbols and the extended CP length is 6 OFDM symbols. A certain subcarrier within an OFDM symbol is called RE (Resource Element), so an RB contains 84 or 72 REs. On one subframe, a pair of RBs of two slots is called a resource block pair, that is, an RB pair.

The method for transmitting and receiving the E-PDCCH according to the embodiment of the present invention will be described in detail below. The embodiment of the present invention provides a method for transmitting an E-PDCCH. As shown in FIG. 1 , the method includes the following steps: Step 11: A base station determines an E-PDCCH that needs to be transmitted to a UE, where the E-PDCCH includes at least two logic controls. unit. As described in the foregoing background, each E-PDCCH is composed of one or several logical control units similar to CCE, and this logical control unit is defined herein as eCCE, that is, each E-PDCCH is composed of one or several The eCCE is configured, and the E-PDCCH is sent in the scenario that the E-PDCCH that needs to be transmitted to the UE includes at least two eCCEs. For example, in an embodiment of the present invention, the E-PDCCH may inherit the aggregation level in the PDCCH, that is, the E-PDCCH has four aggregation levels of 1, 2, 4, and 8, which are optional and need to be transmitted to The number of eCCEs included in the E-PDCCH of the UE is the same as the aggregation level of the E-PDCCH corresponding to the UE, that is, the E-PDCCH with an aggregation level of k (k=l, 2, 4, 8) is composed of k eCCEs. composition. At this time, the method for transmitting the E-PDCCH according to the embodiment of the present invention is used, The scenario in which the aggregation level of the E-PDCCH corresponding to the UE is greater than or equal to 2. Step 12: The base station performs physical resource mapping of the E-PDCCH according to the search space corresponding to the UE, so that the at least two eCCEs are mapped to at least two physical RBs of the same PRG in the search space. match. Similar to the PDCCH, in each downlink subframe, the base station can transmit the E-PDCCH of multiple UEs at a time, and the UE performs blind detection in its corresponding search space, that is, parses all eCCEs in the search space, thereby discovering whether There is control information sent by the base station to itself. When the UE blindly detects its own E-PDCCH, it needs to search according to a certain rule in a certain area, and the range of the search is defined as a search space. That is to say, in the search space corresponding to the UE, in addition to the E-PDCCH of the UE itself, the E-PDCCH transmitted by the base station to other one or more UEs may be included.

In this step, the base station maps at least two eCCEs of the E-PDCCH mapping of the UE to at least two physical RB pairs of the same precoding resource block group PRG in the search space according to the search space corresponding to the UE. . It should be noted that, in the embodiment of the present invention, the search space corresponding to the UE is not limited, and the search space corresponding to the UE may be preset, or may be determined by the base station and allocated to the UE in real time. For example, in the embodiment of the present invention, the search space of the E-PDCCH may inherit the resource allocation manner of the PDSCH, that is, there are Type 0 (Type 0), Type 1 (Type 1), and Type 2 (Type 2) resources. Allocation. If the resource allocation mode of the E-PDCCH is Type 0, an RBG (RB Grou, resource block group) or some RBGs are allocated to the UE as the search space of the UE. The size of the RBG is related to the system bandwidth. If the resource allocation mode is Type 0, a continuous number of RB pairs may be allocated as the search space of the E-PDCCH of the UE.

In the LTE version 10 system, the number of RB pairs in each PRG of the PDSCH is determined by the system bandwidth. In the embodiment of the present invention, the correspondence between the system bandwidth and the PRG can be seen in Table 1. It should be noted that, since the definition of the PRG of the E-PDCCH in the existing standards and specifications is not determined, the embodiment of the present invention takes Table 1 as an example, but is not limited to Table 1.

Table 1

System Bandwidth (Physical RB) PRG Size (RB Pair)

<10 1 11 - 26 2

27 - 63 3

64 - 110 2

For example, as shown in FIG. 2( a ) and ( b ), it is assumed that the physical RB pair 0 to the physical RB pair 3 is the search space of the UE, and the search space includes two PRGs of PRG0 and PRG1, and each has two physical RB pairs. The PRG0 includes the RB pair 0 and the RB pair 1 , the PRG1 includes the RB pair 2 and the RB pair 3 , and the E-PDCCH that needs to be transmitted to the UE includes two eCCEs, which are respectively eCCEl and eCCE2, and in this step, the base station The eCCEl may be mapped on the physical RB pair 0 of the PRG0, and the eCCE2 may be mapped on the physical RB pair 1 of the PRG0, and vice versa. Alternatively, the base station may map the eCCEl on the physical RB pair 2 of the PRG1 and the eCCE2 on the physical RB pair 3 of the PRG1, and vice versa.

In order to implement mapping at least two eCCEs of the E-PDCCH to at least two physical RB pairs of the same PRG in the search space, the following two methods may be used: Method 1: First, respectively The at least two eCCEs of the E-PDCCH perform a modulo operation to obtain a modulus value of each eCCE; and then, mapping the at least two eCCEs to the search space according to the acquired modulus values of the eCCEs At least two physical RB pairs of the same PRG. For example, if there are three physical RB pairs in one PRG, the base station may map an eCCE with a modulo value of 0 in the E-PDCCH to one of the three physical RB pairs, and the eCCE with a modulus of 1 is mapped. On the other RB pair, the remaining eCCEs in the E-PDCCH are mapped on another RB pair other than the foregoing two RB pairs. Manner 2: The eCCE with an odd index in the E-PDCCH maps one or several physical RB pairs in one PRG, and the eCCE with an even number is mapped to another physical RB pair in the same PRG. Of course, it can be understood that how the base station implements mapping at least two eCCEs of the E-PDCCH to at least two physical RB pairs of the same PRG in the search space is not limited to the foregoing two modes, and there may be other manners. The invention is not limited thereto. In an embodiment of the present invention, at least two are provided on each PRG corresponding to The physical resource location of the eCCE, and each RB pair includes at least one of the physical resource locations, and each of the physical resource locations can map one eCCE; in this case, in the step, The at least two eCCEs of the E-PDCCH are respectively mapped to at least two physical resource locations in the same PRG in the search space, and the mapped physical resource locations are distributed in at least two of the PRGs. Physical RB pairs. In an embodiment of the present invention, in the search space corresponding to the UE, p+1 eCCEs can be mapped, and the indexes of the p+1 eCCEs are respectively 0-p, and each PRG in the search space The n+1 eCCEs can be mapped, and the indexes of the n+1 eCCEs are m to m+n, where p, m, and n are integers. According to the index order of the PRG, the index range of the eCCEs that can be mapped by each PRG is continuous, but the indexes of the eCCEs mapped on each RB pair in each PRG are not continuous. At this time, in this step, the mapping of at least two eCCEs of the E-PDCCH is performed, so that at least two eCCEs of the E-PDCCH are distributed on at least two RB pairs in one PRG. For example, as shown in FIG. 3, 16 eCCEs can be mapped, and the 16 eCCE indexes are 0 to 15, respectively. The search space includes PRG0 and PRG1, wherein each PRG can map 8 eCCEs, PRG0. The index of the upper mapped eCCE is 0 to 7, and the index of the eCCE that PRG1 can map is 8 to 15, and the index range of the eCCE mapped by PRG0 and the index range of the eCCE mapped by PRG1 are consecutive. In PRG0, the index of the eCCE mapped on the RB pair 0 is 0, 2, 4, and 6, respectively, and the indexes of the eCCEs mapped on the RB pair 1 are 1, 3, 5, and 7, respectively, in the PRG0, the RB pair 2 The indexes of the mapped eCCEs are 8, 10, 12, and 14, respectively, and the indexes of the eCCEs mapped on the RB pair 3 are 9, 11, 13, and 15, respectively, that is, within each PRG, the eCCEs with an odd index are mapped. One RB pair, the even-numbered eCCE is mapped on the other RB pair. Of course, the index of the eCCE mapped on each RB pair may also have other separate manners. It is assumed that the E-PDCCH includes two eCCEs, namely eCCEi and eCCE(i+l), that is, an index is an odd number and an even number. In this step, according to the indexes of the two eCCEs, and the mapping shown in FIG. In this manner, the eCCEi and eCCE(i+1) may be mapped to RB0 and RB1, respectively, or mapped to RB2 and RB3, respectively, so that the two eCCEs are distributed on two RB pairs in one PRG.

Step 13: The base station sends the mapped E-PDCCH to the UE. In the method for transmitting an E-PDCCH according to an embodiment of the present invention, at least two eCCEs of the E-PDCCH are mapped to at least two RB pairs, so at least two mapped maps may be used. The RB pair performs joint channel estimation, which effectively improves the performance of channel estimation. It should be noted that, in an embodiment of the present invention, after step 12, before step 13, the base station further needs to perform precoding processing on the mapped E-PDCCH, and in step 13, the base station sends Transmitting the mapping and precoding the processed E-PDCCH to the UE. In order to facilitate demodulation of the control information by the UE, preferably, at least two eCCEs mapped to at least two physical RB pairs of the same PRG in the search space in step 12 use the same precoding method, that is, use The same precoding matrix is precoded. In this way, regardless of whether these eCCEs use the same DMRS port, the UE can perform demodulation in the same manner.

In an embodiment of the present invention, the E-PDCCH may have two transmission modes, a localized transmission and a distributed transmission. The so-called centralized transmission means that the resource unit corresponding to one eCCE of the E-PDCCH is mapped in one physical RB pair (hereinafter referred to as an RRB pair), and the so-called distributed transmission refers to resource element mapping corresponding to one eCCE of the E-PDCCH. Within multiple PRB pairs. For example, in the case of a normal CP, one eCCE is composed of four resource element groups eREG similar to the resource element group REG, and there are 16 eREGs in one PRB pair. For the E-PDCCH of the centralized transmission, the resource units corresponding to the eCCEs are mapped in one physical RB pair. Therefore, for the E-PDCCH of the centralized transmission, four eCCEs can be mapped in one PRB pair. Further, in an embodiment of the present invention, the E-PDCCH adopts a centralized transmission mode, and a set of PRB pairs to which K ( K>=1 ) E-PDCCHs can be mapped is defined in advance, and each set includes N (N>=1) PRB pairs. In this case, in step 12, when performing physical resource mapping of the E-PDCCH, the base station first selects one set among the K sets according to the search space corresponding to the UE. The embodiment of the present invention does not limit how the base station selects in the K sets according to the search space corresponding to the UE. Then, the base station maps the E-PDCCH to the PRB pair in the set, so that at least two eCCEs of the E-PDCCH are mapped to at least two physical RB pairs of the same PRG in the search space of the UE in the set. on.

For example, suppose a PRG has a size of 2 PRB pairs, a PRB pair that maps E-PDCCH has 4 PRB pairs in a set, and a PRB pair has 4 eCCEs, as shown in FIG. 9 for a PRB pair set, this set The PRB pair consisting of 4 indexes of 0, 4, 5, and 8 is located in the search space of the UE, where the PRB pair 0 is located in the PRG1. Among them, PRB pair 4 is located in PRG3, PRB pair 5 is located in PRG3, PRB pair 8 is located in PRG5, PRB pair 4 and PRB pair 5 belong to the same PRG. Optionally, the DMRS port (Port) used by the E-PDCCH in one PRB pair is implicitly indicated by an E-PDCCH index mapped to the eCCE of the PRB pair. For example, an eCCEO with an index of 0 corresponds to the DMRS port 7, The eCCEl with index 1 corresponds to DMRS port 8, the eCCE2 with index 2 corresponds to DMRS port 9, and the eCCE3 with index 3 corresponds to DMRS port 10.

Assume that the E-PDCCH of the centralized transmission has an aggregation level of 2, that is, the E-PDCCH includes two eCCEs, and in step 12, the base station selects the PR-B set of the E-PDCCH mapping shown in FIG. As shown in FIG. 10, in this set of PRB pairs, the E-PDCCH has multiple candidate mapping locations. Since the E-PDCCH is transmitted in a centralized manner, the resource units corresponding to one eCCE are mapped into one PRB pair, so this is The candidate locations may include eCCEO and eCCEl of PRB0, eCCE2 and eCCE3 of PRB0, eCCEO and eCCEl of PRB4, and the like. Since the PRB pair 4 and the PRB pair 5 belong to the same PRG, in step 12, the base station maps the EPDCCH of the aggregation level 2 to one eCCE position of the PRB pair 4 and one eCCE position of the PRB pair 5, respectively, so that Joint channel estimation can be performed to effectively improve the performance of channel estimation. The base station preferably maps the two eCCEs of the E-PDCCH to the eCCE locations corresponding to the same DMRS port, so that the UE can perform demodulation. For example, the base station maps the EPDCCH of the aggregation level 2 to the eCCEO of the PRB pair 4 and the eCCEO of the PRB pair 5, respectively, both of which correspond to the DMRS port 7. It is assumed that the E-PDCCH of the centralized transmission has an aggregation level of 4, that is, the E-PDCCH includes 4 eCCEs, and in step 12, the base station selects the PR-pair set shown in FIG. 9 to perform E-PDCCH mapping. As shown in FIG. 10, the base station maps the four eCCEs of the EPDCCH with the aggregation level of 4 to the PRB pair 4 and the PRB pair 5, for example, the eCCEO and eCCEl positions of the PRB pair 4, and the eCCEO of the PRB pair 5 The eCCEl location, and the eCCEO and eCCEl locations of the PRB pair 4 and the PRB pair 5 may correspond to the same DMRS port, such as port 7, facilitating demodulation by the UE. It should be noted that, in the case that the set of PRB pairs that can be mapped by the E-PDCCH is preset, in one embodiment of the present invention, the base station may have multiple mapping modes when performing mapping, for example, there may be two Optional mapping method:

One mapping method is to map the eCCE of the E-PDCCH to the same PRB pair in the PRB pair set. The aggregation level is 2, and the two eCCEs of the EPDCCH are mapped. In the eCCEO and eCCEl positions of the PRBO in 10, the four eCCEs of the EPDCCH are mapped to the eCCEO to eCCE3 positions of the PRB0 in FIG. 10 with the aggregation level of 4 as an example.

Another mapping method is to pair at least two PRBs in the same PRG in the search space of the eCCE mapping UE of the E-PDCCH in the foregoing embodiment.

The base station may determine a mapping manner in the two manners, and perform mapping according to the determined mapping manner. In this case, the base station may notify the UE of the selected mapping manner by using the high layer signaling, so that the UE learns the base station. The mapping mode thus receives the E-PDCCH. This high layer signaling can be referred to as E-PDCCH PRB bundling signaling. It should be noted that, when the size of the PRG is 3 PRB pairs, and the three PRB pairs are all configured in the search space range of the E-PDCCH, if the aggregation level of the E-PDCCH is 2, the E-PDCCH is Including the two eCCEs, in step 12, in order to map the two eCCEs to two RB pairs in the same PRG, the base station can use the following two methods: First, select two adjacent PRBs in the PRG. Pairing, mapping one eCCE of the E-PDCCH to one of the two adjacent PRB pairs, and mapping another eCCE of the E-PDCCH to another RB pair of the two adjacent PRB pairs on. For example, as shown in Figure 1 1 ( a ), one PRG includes three PRB pairs of PRB pair x, PRB pair x+1, PRB pair x+2, and the base station selects PRB pair x, PRB pair when performing mapping. X+1 two adjacent RB pairs, and map one eCCE of the E-PDCCH in the PRB pair X, and map another eCCE of the E-PDCCH in the PRB pair x+1, for example, E- One eCCE of the PDCCH is mapped to the eCCEO position in the PRB pair x, and another eCCE of the E-PDCCH is mapped to the eCCEO position in the PRB pair x+1, or one eCCE of the E-PDCCH is mapped in the PRB pair x eCCEl location, and mapping another eCCE of the E-PDCCH to the eCCEl position in the PRB pair x+1, or mapping one eCCE of the E-PDCCH to the eCCE2 position in the PRB pair x, and the E-PDCCH Another eCCE maps the eCCE2 position in the PRB pair x+1, or maps one eCCE of the E-PDCCH to the eCCE3 position in the PRB pair X, and maps another eCCE of the E-PDCCH to the PRB pair x+1 The location of the eCCE3.

Second, selecting two adjacent PRB pairs in the PRG, mapping one eCCE of the E-PDCCH to one PRB pair of the two adjacent PRB pairs, and another E-PDCCH The eCCE is mapped on the other RB pair of the two adjacent PRB pairs. Another way is to sequentially set a plurality of sets of candidate mapping positions including two eCCE positions on different PRB pairs according to the index order of the PRB pair and the index order of the intra-eCCE positions in the PRB pair, and in these candidate mapping position groups. Select a group to map. For example, as shown in FIG. 11 (b), one PRG includes three PRB pairs of PRB pair x, PRB pair x+1, PRB pair x+2, "sequentially according to the index order of the PRB pair and the PRB inbound eCCE. The index order of the location sets several groups including two eCCE locations located on different PRB pairs." refers to the index order of the PRB pairs in sequence and the index order of the eCCE locations in the PRB pairs. The PRCC vs. e's eCCEO and PRB pairs x+ The eCCEO of 1 is a set of candidate mapping positions, the eCCEO of PRB x+2 and the eCCEl of PRB x are a set of candidate mapping positions; the eCCEl of PRB x+1 and the eCCEl of PRB x+2 are a set of candidate mapping positions, .. ...and so on. When the base station performs mapping, a set of execution mappings is selected among these candidate mapping location groups. It should be noted that if the mapping positions of the two eCCEs of the E-PDCCH correspond to multiple DMRS ports, for example, the mapping positions of the two eCCEs of the E-PDCCH are eCCO of PRB x+2 and eCCEl of PRB X, PRB x+ The eCCE 0 of 2 uses port 7, and the eCCE 1 of the PRB uses port 8, the base station can precode the two eCCEs of the E-PDCCH using the same precoding matrix, and the UE considers the two ports when performing channel estimation. Precoding is performed using the same precoding matrix. Similarly, when the size of the PRG is 3 PRB pairs, and the three PRB pairs are all configured in the search space range of the E-PDCCH, if the aggregation level of the E-PDCCH is 4, the E-PDCCH includes 4 eCCE, in step 12, in order to map the two eCCEs to two RB pairs in the same PRG, the base station may use a similar manner to the foregoing aggregation level of 2, for example, Figure 12 (a) and ( For details, see the previous description when the aggregation level is 2. It is not mentioned here.

Corresponding to the method shown in FIG. 1 , the embodiment of the present invention further provides a method for receiving an E-PDCCH, as shown in FIG. 4, including:

Step 21: The UE receives the control information in the search space corresponding to the UE, where the control information includes an E-PDCCH that is sent by the base station to the UE, where the E-PDCCH includes at least two eCCEs, and the at least two eCCEs are mapped by the base station to the search space At least two physical resource block RB pairs of the same precoding resource block group PRG. In the search space corresponding to the UE, in addition to the E-PDCCH of the UE itself, the E-PDCCH transmitted by the base station to other one or more UEs may be included, and the UE usually receives all the control information in the search space. Then, the received control information is blindly detected according to a certain rule, thereby discovering whether there is control information sent by the base station to itself in the received control information.

Optionally, the number of the eCCEs included in the E-PDCCH is the same as the aggregation level value of the E-PDCCH corresponding to the UE. Preferably, the mapping to the at least two eCCEs on the at least two physical RB pairs of the same PRG in the search space uses the same precoding manner. Optionally, the at least two eCCEs included in the E-PDCCH are mapped by the base station to at least two physical RB pairs of the same PRG in the search space according to the modulus values of the eCCEs.

Optionally, in the search space corresponding to the UE, each PRG includes at least two physical resource locations, each RB pair includes at least one physical resource location, and each physical resource location can map one site. The at least two eCCEs of the E-PDCCH are respectively mapped to the physical resource locations in the same PRG in the search space, and the mapped physical resource locations are distributed in the PRG. At least two physical RB pairs.

Optionally, in the search space corresponding to the UE, n+1 eCCEs can be mapped on each PRG, and the indexes of the n+1 eCCEs are m to m+n, where m and n are integers.

Step 22: The UE performs blind detection on the received control information to obtain the E-PDCCH.

For the method of the blind detection, refer to the prior art, which is not limited by the present invention. In the method for receiving an E-PDCCH according to the embodiment of the present invention, at least two eCCEs of the E-PDCCH that are sent by the base station to the UE are mapped to at least two RB pairs, and thus the mapped at least two RB pairs may be used. Joint channel estimation, effectively improving the channel estimation

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In an embodiment of the present invention, the E-PDCCH uses a resource unit corresponding to each logical control unit of the E-PDCCH to be mapped in a centralized manner in the same physical RB pair. In the transmission mode, and pre-defined K (K>=1) sets of PRB pairs that the E-PDCCH can map, each set includes N (N>=1) PRB pairs, in this case, in step 21 The UE may determine a physical RB pair set capable of performing the physical resource mapping of the E-PDCCH, and may specifically determine a physical RB capable of performing physical resource mapping of the E-PDCCH according to a preset or a notification of the base station. For the set, and in step 21, according to the determined set of physical RB pairs capable of performing physical resource mapping of the E-PDCCH, receiving control information in a search space corresponding to the UE.

The set of physical RB pairs that can be used to perform the physical resource mapping of the E-PDCCH may be a predefined K set, or may be a PRB selected by the base station to perform physical resource mapping of the E-PDCCH. For the collection.

Further, in an embodiment of the present invention, the base station may use multiple mapping modes, and notify the UE of the mapping manner by using the high layer signaling. Therefore, before step 21, the UE will receive the upper layer sent by the base station. Signaling, the high layer signaling indicates the manner in which the base station maps the E-PDCCH, and in step 21, the UE receives according to the mapping manner of the base station to the E-PDCCH indicated by the high layer signaling. Control information in the search space corresponding to the UE.

Corresponding to the foregoing method embodiment, the embodiment of the present invention further provides a base station, as shown in FIG. 5, including: a determining unit 101, configured to determine an E-PDCCH that needs to be transmitted to a UE, where the E-PDCCH includes at least The mapping unit 102 is configured to perform physical resource mapping of the E-PDCCH determined by the determining unit 101 according to the search space corresponding to the UE, so that the at least two eCCEs are mapped to the same one in the search space. At least two physical resource block RB pairs of the pre-coded resource block group PRG; the sending unit 103 is configured to send, to the UE, the E-PDCCH mapped by the mapping unit 102. The base station provided by the embodiment of the present invention, the at least two eCCEs of the E-PDCCH that are sent to the UE are mapped to at least two RB pairs, so that the joint channel estimation can be performed by using the mapped at least two RB pairs, thereby effectively improving The performance of channel estimation.

Optionally, in an embodiment of the present invention, the e-CE includes the eCCE The number of aggregations is the same as the aggregation level value of the E-PDCCH corresponding to the UE. Preferably, in an embodiment of the present invention, as shown in FIG. 6, the base station further includes an encoding unit 104, configured to perform precoding processing on the E-PDCCH after the mapping unit 102, where the mapping to the The at least two eCCEs on the at least two physical RB pairs of the same PRG in the search space use the same precoding mode; the sending unit 103 is specifically configured to send the mapping to the UE and pre-coded the E. - PDCCH. Optionally, in an embodiment of the present invention, the mapping unit 102 is specifically configured to: perform a modulo operation on the at least two eCCEs of the E-PDCCH, respectively, to obtain a modulus value of each eCCE; Obtaining the modulus values of the eCCEs, mapping the at least two eCCEs to at least two physical RB pairs of the same PRG in the search space. Optionally, in an embodiment of the present invention, in a search space corresponding to the UE, each PRG includes at least two physical resource locations, and each RB pair includes at least one of the physical resource locations, where each The mapping, the mapping unit 102 is configured to: map the at least two eCCEs of the E-PDCCH to the physical resources in the same PRG in the search space, respectively. Positionally, the mapped physical resource locations are distributed on at least two physical RB pairs in the PRG. Optionally, in an embodiment of the present invention, in the search space corresponding to the UE, n+1 eCCEs can be mapped on each PRG, and the indexes of the n+1 eCCEs are m to m+n. Where m and n are integers.

Optionally, in one embodiment of the invention:

The E-PDCCH uses a resource unit corresponding to each logical control unit of the E-PDCCH to map a centralized transmission mode in the same physical RB pair;

Mapping unit 102 is used to:

Selecting a physical RB pair set for performing physical resource mapping of the E-PDCCH according to a search space corresponding to the UE;

Mapping the at least two logical control units of the E-PDCCH to at least two physical RBs in the selected set of physical RB pairs and located in the same precoding resource block group PRG in the search space match.

Further, in one embodiment of the invention:

The determining unit 101 is further configured to determine a mapping of the physical resource mapping of the E-PDCCH. Shooting method

Mapping unit 102 is used to:

According to the mapping manner determined by the determining unit 101, when the determined mapping manner is to map the logical control unit of the E-PDCCH to at least two PRB pairs in the same PRG in the search space of the UE, The at least two logical control units of the E-PDCCH are mapped on the at least two physical RB pairs in the selected set of physical RB pairs and located in the same precoding resource block group PRG in the search space; Among them, PRB is a physical RB.

The sending unit 103 is also used to:

Transmitting high layer signaling to the UE, the high layer signaling indicating a mapping manner determined by the base station.

Corresponding to the foregoing method embodiment, the embodiment of the present invention further provides a UE, as shown in FIG. 7, including:

The receiving unit 201 is configured to receive control information in a search space corresponding to the UE, where the control information includes an E-PDCCH that is sent by the base station to the UE, where the E-PDCCH includes at least two eCCEs, and the At least two eCCEs are mapped by the base station to at least two physical resource block RB pairs of the same precoding resource block group PRG in the search space; the blind detecting unit 202 is configured to receive control information received by the receiving unit 201. Perform blind detection to obtain the E-PDCCH. In the UE provided by the embodiment of the present invention, at least two eCCEs of the E-PDCCH that are sent by the base station to the UE are mapped to at least two RB pairs, so that joint channel estimation can be performed using the mapped at least two RB pairs, which is effective. Improve the performance of channel estimation.

Optionally, in an embodiment of the present invention, the number of the eCCEs included in the E-PDCCH is the same as the aggregation level value of the E-PDCCH corresponding to the UE. Preferably, in an embodiment of the present invention, the mapping to the at least two eCCEs on the at least two physical RB pairs of the same PRG in the search space uses the same pre-coding manner.

Optionally, in an embodiment of the present invention, at least two eCCEs included in the E-PDCCH are mapped by the base station to at least two of the same PRG in the search space according to a modulus value of each eCCE. Physical RB pairs. Optionally, in an embodiment of the present invention, in a search space corresponding to the UE, each PRG includes at least two physical resource locations, and each RB pair includes at least one of the physical resource locations, where each The at least two eCCEs of the E-PDCCH received by the receiving unit 202 are mapped to the physical resource locations in the same PRG in the search space, respectively. The mapped physical resource locations are distributed on at least two physical RB pairs within the PRG.

Optionally, in an embodiment of the present invention, in the search space corresponding to the UE, n+1 eCCEs can be mapped on each PRG, and the indexes of the n+1 eCCEs are m to m+n. Where m and n are integers. Optionally, in an embodiment of the present invention, as shown in FIG. 8:

The UE further includes:

a determining unit 203, configured to determine a physical RB pair set capable of performing physical resource mapping of the E-PDCCH;

The receiving unit 201 is configured to:

And receiving, according to the determining, a physical RB pair set capable of performing physical resource mapping of the E-PDCCH, and receiving control information in a search space corresponding to the UE. Further, in one embodiment of the invention:

The receiving unit 201 is configured to receive the high layer signaling sent by the base station, where the high layer signaling indicates the mapping manner of the E-PDCCH by the base station, and according to the mapping manner of the base station to the E-PDCCH indicated by the high layer signaling, Receiving control information in a search space corresponding to the UE.

FIG. 13 is a diagram showing another embodiment of a base station provided by the present invention. As shown in FIG. 13, the base station 30 provided in this embodiment includes:

A processor 301, a memory 302, a communication interface 303, and a bus 304.

The processor 301, the memory 302, and the communication interface 303 are connected by the bus 304 and perform communication with each other.

The bus 304 may be an Industry Standard Architecture (abbreviated as ISA) bus, or a peripheral component (Peripheral Component, Referred to as PCI) bus or Extended Industry Standard Architecture (EISA) bus. The bus 304 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 13, but it does not mean that there is only one bus or one type of bus. among them:

Memory 302 is for storing executable program code, the program code including computer operating instructions. The memory 302 may include a high speed RAM memory, and may also include a non-volatile memory, for example, at least one disk memory. The processor 301 runs a program corresponding to the executable program code by reading executable program code stored in the memory 302, and is configured to: determine an E-PDCCH that needs to be transmitted to the UE, where the E-PDCCH includes at least two a logical control unit, performing physical resource mapping of the E-PDCCH according to a search space corresponding to the UE, so that the at least two logical control units are mapped to the same pre-coded resource block group PRG in the search space At least two physical resource blocks RB pairs;

Transmitting the mapped E-PDCCH to the UE. The processor 301 may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one configured to implement an embodiment of the present invention. Multiple integrated circuits. It should be noted that, in addition to the foregoing functions, the foregoing processor 301 may be used to perform other processes in the foregoing method embodiments, and details are not described herein again. It should be noted that the division of each functional unit in the processor 301 can be referred to the foregoing embodiment of the base station, and details are not described herein again.

FIG. 14 is a diagram showing another embodiment of a UE according to the present invention. As shown in FIG. 14, the UE 40 provided in this embodiment includes:

Processor 401, memory 402, communication interface 403, and bus 404. The processor 401, the memory 402, and the communication interface 403 are connected and completed through the bus 404. Communication with each other. The bus 404 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA). ) Bus, etc. The bus 404 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 13, but it does not mean that there is only one bus or one type of bus. among them:

Memory 402 is for storing executable program code, the program code including computer operating instructions. The memory 402 may include a high speed RAM memory, and may also include a non-volatile memory, for example, at least one disk memory.

The processor 401 runs a program corresponding to the executable program code by reading executable program code stored in the memory 402 for:

Receiving control information in a search space corresponding to the UE, where the control information includes an E-PDCCH that is sent by the base station to the UE, where the E-PDCCH includes at least two logical control units, and the at least two logics The control unit is mapped by the base station to at least two physical resource block RB pairs of the same precoding resource block group PRG in the search space;

Performing blind detection on the received control information to obtain the E-PDCCH. The processor 401 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one configured to implement an embodiment of the present invention. Multiple integrated circuits. It should be noted that, in addition to the foregoing functions, the foregoing processor 401 may be used to perform other processes in the foregoing method embodiments, and details are not described herein again. It should be noted that the division of each functional unit in the processor 401 can be referred to the foregoing embodiment of the UE, and details are not described herein again.

It can be understood by those skilled in the art that each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can use hardware The form can also be implemented in the form of hardware plus software functional units.

The above-described units implemented in the form of software functional units may be stored in a computer readable storage medium. The above software functional units are stored in a storage medium and include instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. medium.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

Claim

An enhanced physical downlink control channel E-PDCCH transmission method, which is characterized in that:

Determining an E-PDCCH that needs to be transmitted to the user equipment, where the E-PDCCH includes at least two logical control units;

Performing physical resource mapping of the E-PDCCH according to a search space corresponding to the user equipment, so that the at least two logical control units are mapped to at least two of the same precoding resource block group PRG in the search space. Physical resource block RB pair;

And transmitting the mapped E-PDCCH to the user equipment.

The transmission method according to claim 1, wherein the number of the logical control units included in the E-PDCCH is the same as the aggregation level value of the E-PDCCH corresponding to the user equipment.

The transmitting method according to claim 1, wherein the performing the physical resource mapping of the E-PDCCH according to the search space corresponding to the user equipment, the transmitting the Before the mapping of the E-PDCCH, the method further includes:

The sending the mapped E-PDCCH to the user equipment includes:

Transmitting the mapping and precoding the processed E-PDCCH to the user equipment.

4. The transmitting method according to claim 1, wherein:

Performing a modulo operation on the at least two logical control units of the E-PDCCH to obtain a modulus value of each logical control unit;

And mapping the at least two logical control units to at least two physical RB pairs of the same PRG in the search space according to the acquired modulus values of the logical control units.

5. The transmitting method according to claim 1, wherein:

In the search space corresponding to the user equipment, each PRG includes at least two physical resource locations, each RB pair includes at least one of the physical resource locations, and each of the physical resource locations can map one of the logical controls. Unit

Performing the physical of the E-PDCCH according to the search space corresponding to the user equipment Resource mapping includes:

Mapping the at least two logical control units of the E-PDCCH to the physical resource locations in the same PRG in the search space, where the mapped physical resource locations are distributed in the PRG At least two physical RB pairs.

The transmitting method according to any one of claims 1 to 5, wherein in the search space corresponding to the user equipment, n+1 logical control units can be mapped in each PRG, the n+ The index of one logical control unit is m to m+n, where m and n are integers.

7. The transmitting method according to claim 1, wherein:

The transmitting method according to claim 7, wherein the at least two logical control units of the E-PDCCH are mapped in the selected set of physical RB pairs and located in the search At least two physical RB pairs in the same pre-coded resource block group PRG in the space, the method further includes:

Determining a mapping manner of performing physical resource mapping of the E-PDCCH;

Mapping the at least two logical control units of the E-PDCCH to at least two of the selected set of physical RB pairs and located in the same precoding resource block group PRG in the search space The physical RB pair includes:

According to the determined mapping manner, when the determined mapping manner is to map the logical control unit of the E-PDCCH to at least two PRB pairs in the same PRG in the search space of the UE, the E is - the at least two logical control units of the PDCCH are mapped on at least two physical RB pairs in the selected set of physical RB pairs and located in the same precoding resource block group PRG in the search space;

The method further includes:

Transmitting, to the user equipment, high layer signaling, where the high layer signaling indicates that the base station determines The way to map.

9. An enhanced physical downlink control channel E-PDCCH receiving method, characterized in that:

The user equipment receives the control information in the search space corresponding to the user equipment, where the control information includes an E-PDCCH that is sent by the base station to the user equipment, where the E-PDCCH includes at least two logical control units, and the At least two logical control units are mapped by the base station to at least two physical resource block RB pairs of the same precoding resource block group PRG in the search space;

The user equipment performs blind detection on the received control information to obtain the E-PDCCH.

The receiving method according to claim 9, wherein the number of the logical control units included in the E-PDCCH is the same as the aggregation level value of the E-PDCCH corresponding to the user equipment.

The receiving method according to claim 9, wherein the mapping to the at least two logical control units on at least two physical RB pairs of the same PRG in the search space uses the same precoding the way.

The receiving method according to claim 9, wherein at least two logical control units included in the E-PDCCH are mapped to the search space by the base station according to a modulus value of each of the logical control units. At least two physical RB pairs of the same PRG.

13. The receiving method according to claim 9, wherein:

The receiving method according to any one of claims 9 to 13, wherein in the search space corresponding to the user equipment, n+1 logical control units can be mapped on each PRG, the n+ The index of one logical control unit is m to m+n, where m, n are integers.

15. The receiving method according to claim 9, wherein:

The E-PDCCH uses resources corresponding to each logical control unit of the E-PDCCH The unit maps the centralized transmission mode within the same physical RB pair;

Before the user equipment receives the control information in the search space corresponding to the user equipment, the method further includes:

Determining, by the user equipment, a set of physical RB pairs capable of performing physical resource mapping of the E-PDCCH;

The receiving, by the user equipment, the control information in the search space corresponding to the user equipment includes:

And the user equipment receives the control information in the search space corresponding to the user equipment according to the determined physical RB pair set capable of performing physical resource mapping of the E-PDCCH.

The receiving method according to claim 15, wherein before the user equipment receives the control information in the search space corresponding to the user equipment, the method further includes: the user equipment receiving the sending by the base station High-level signaling, the high-layer signaling indicating a mapping manner of the E-PDCCH by the base station;

And the user equipment receives the control information in the search space corresponding to the user equipment according to the mapping manner of the base station to the E-PDCCH indicated by the high layer signaling.

17. A base station, comprising:

a determining unit, configured to determine an E-PDCCH that needs to be transmitted to the user equipment, where the E-PDCCH includes at least two logical control units;

a mapping unit, configured to perform, according to a search space corresponding to the user equipment, a physical resource mapping of the E-PDCCH determined by the determining unit, so that the at least two logical control units are mapped to the same pre-in the search space Encoding at least two physical resource block RB pairs of the resource block group PRG;

And a sending unit, configured to send the mapping unit mapped E-PDCCH to the user equipment.

The base station according to claim 17, wherein the number of the logical control units included in the E-PDCCH is the same as the aggregation level value of the E-PDCCH corresponding to the user equipment.

The base station according to claim 17, wherein the base station further includes an encoding unit, configured to perform precoding processing on the mapped E-PDCCH, where the mapping At least two logical control units on at least two physical RB pairs of the same PRG in the search space use the same precoding method;

The sending unit is specifically configured to send the mapping and pre-encode the processed E-PDCCH to the user equipment.

The base station according to claim 17, wherein the mapping unit is specifically configured to:

21. The base station according to claim 17, wherein:

The base station according to any one of claims 17 to 21, wherein, in the search space corresponding to the user equipment, n+1 logical control units can be mapped on each PRG, the n+1 The index of the logical control unit is m to m+n, where m, n are integers.

23. The base station according to claim 17, wherein:

The mapping unit is used to:

24. The base station according to claim 23, characterized in that

The determining unit is further configured to determine a mapping manner of performing physical resource mapping of the E-PDCCH; The mapping unit is used to:

According to the mapping manner determined by the determining unit, the determined mapping manner is

Mapping the at least two logical control units of the E-PDCCH to the selected one when the logical control unit of the E-PDCCH is mapped to at least two PRB pairs in the same PRG in the search space of the UE Physical RB pairs on at least two physical RB pairs in the set and located in the same precoding resource block group PRG in the search space;

The sending unit is further configured to:

Transmitting high layer signaling to the user equipment, where the high layer signaling indicates a mapping manner determined by the base station.

25. A user equipment, comprising:

a receiving unit, configured to receive control information in a search space corresponding to the user equipment, where the control information includes an E-PDCCH that is sent by the base station to the user equipment, where the E-PDCCH includes at least two logical control units, And the at least two logical control units are mapped by the base station to at least two physical resource block RB pairs of the same precoding resource block group PR G in the search space;

And a blind detection unit, configured to perform blind detection on the control information received by the receiving unit, to obtain the E-PDCCH.

The user equipment according to claim 25, wherein the number of the logical control units included in the E-PDCCH is the same as the aggregation level value of the E-PDCCH corresponding to the user equipment.

The user equipment according to claim 25, wherein the at least two logical control units mapped to at least two physical RB pairs of the same PRG in the search space use the same precoding the way.

The user equipment according to claim 25, wherein at least two logical control units included in the E-PDCCH are mapped to the search space by the base station according to a modulus value of each of the logical control units. At least two physical RB pairs of the same PRG.

29. The user equipment of claim 25, wherein

The at least two logical control units of the E-PDCCH received by the receiving unit are respectively mapped to the physical resource locations in the same PRG in the search space, The mapped physical resource locations are distributed over at least two physical RB pairs within the PRG.

The user equipment according to any one of claims 25 to 29, wherein in the search space corresponding to the user equipment, n+1 logical control units can be mapped on each PRG, the n+ The index of one logical control unit is m to m+n, where m, n are integers.

31. The user equipment of claim 25, wherein

The user equipment further includes:

a determining unit, configured to determine a physical RB pair set capable of performing physical resource mapping of the E-PDCCH;

The receiving unit is used to:

And receiving, according to the determining, a physical RB pair set capable of performing physical resource mapping of the E-PDCCH, and receiving control information in a search space corresponding to the user equipment.

32. The user equipment of claim 31, wherein

The receiving unit is configured to receive the high layer signaling sent by the base station, where the high layer signaling indicates the mapping manner of the E-PDCCH by the base station, and the mapping manner of the base station to the E-PDCCH indicated by the high layer signaling Receiving control information in a search space corresponding to the user equipment.

33. A base station, comprising:

Processor, memory, communication interface, and bus;

The processor, the memory and the communication interface are connected by the bus and complete communication with each other;

The memory is for storing executable program code;

The processor runs a program corresponding to the executable program code by reading executable program code stored in the memory for:

And transmitting the mapped E-PDCCH to the user equipment.

34. A user equipment, comprising: Processor, memory, communication interface, and bus;

The memory is for storing executable program code;

Receiving control information in a search space corresponding to the user equipment, where the control information includes an E-PDCCH that is sent by the base station to the user equipment, where the E-PDCCH includes at least two logical control units, and the at least two Logic control units are mapped by the base station to at least two physical resource block RB pairs of the same pre-coded resource block group PRG in the search space;