WO2013023541A1

WO2013023541A1 - Method and device for transmitting downlink control information

Info

Publication number: WO2013023541A1
Application number: PCT/CN2012/079837
Authority: WO
Inventors: 张然然; 赵锐; 林亚男; 潘学明; 高秋彬
Original assignee: 电信科学技术研究院
Priority date: 2011-08-12
Filing date: 2012-08-08
Publication date: 2013-02-21
Also published as: CN102355732A

Abstract

Disclosed are a method and a device for transmitting downlink control information. The method comprises: allocating a resource cluster to an E-PDCCH of a receiving end, and notifying the receiving end of the location information of the resource cluster, the resource cluster comprising N_c resource portions, and each resource portion being formed of N_SRBP sub resource block pairs subRB pairs; according to a determined aggregation level, allocating a resource to downlink control information in the resource cluster, and transmitting the downlink control information to the receiving end on the allocated resource, the minimal unit of the allocated resource being a subRB pair; receiving end, by taking the subRB pair as a minimal unit, based on an optional aggregation level, acquiring the downlink control information within a usable resource in a blind detection manner. The present application provides a resource allocation method and a blind detection solution based on a subRB pair to support an E-PDCCH transmission solution based on a subRB pair.

Description

Downlink control information transmission method and device

The present application claims priority to Chinese Patent Application No. 201110231145.9, entitled "A Downlink Control Information Transmission Method and Apparatus", filed on August 12, 2011, the entire contents of which are incorporated herein by reference. In the application. Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a downlink control information transmission method and apparatus.

Background technique

In the LTE (Long Term Evolution) system, PDCCH (Physical Downlink Control Channel) data is transmitted in each radio subframe and is associated with a downlink downlink SCHSCH (Physical Downlink Shared Channel). The data forms a TDM (Time Division Multiple) relationship. The PDCCH is transmitted by the first N OFDM (Orthogonal Frequency Division Multiplexing) symbols of one downlink subframe, where N may take values of 1, 2, 3, 4, and N=4 is only allowed to appear in The system bandwidth is 1.4MHz.

FIG. 1 is a schematic diagram of a multiplexing relationship between a control region and a data region in a downlink subframe, where a control region for transmitting a PDCCH in an LTE system is formed by a logically divided CCE (Control Channel Element), where CCE The mapping to the RE (Resource Element) uses a fully interlaced approach. The transmission of DCI (downlink control information) is also based on CCE. One DCI for one UE can be transmitted in N consecutive CCEs. In LTE system, the possible value of N is 1,2. 4,8, called CCE Aggregation Level.

The UE performs a PDCCH blind check in the control area to search whether there is a PDCCH for the PDCCH. The blind detection uses the RNTI (Radio Network Temporary Identifier) of the UE to decode different DCI formats and CCE aggregation levels. If the decoding is correct, the DCI for the UE is received. The LTE UE needs to perform blind detection on the control region for each downlink subframe in the non-DRX (Discontinuous Reception) state to search for the PDCCH.

Due to MU-MIMO (Multi User Multiple Input Multiple Output),

CoMP (Coordinated Multipoint Transmission/Reception), carrier aggregation and other technologies, and introduction of RRH (Remote Radio Head) and 8 antennas with the same cell ID (identification), LTE-A (Long Term) Evolution-Advanced, long-term evolution upgrade) The capacity and transmission efficiency of the PDSCH of the system will be greatly improved; while the relatively early LTE version (such as Rel-8/9), the PDSCH of the LTE-A system has not benefited from the new technology. And get promoted.

On the one hand, the application of new technologies enables PDSCH to provide data transmission for more users at the same time, which will greatly improve The demand for PDCCH channel capacity; on the other hand, new technologies such as DM-RS applied in PDSCH and R (Relay)-PDCCH applied in Relay backhaul (relay backhaul) provide PDCCH enhancement Technology and experience.

In order to solve the problem that the PDCCH capacity is limited and the transmission efficiency of the downlink control information is improved, a current solution is to: transmit the enhanced PDCCH in the PDSCH domain in the downlink subframe while retaining the original PDCCH domain.

The original PDCCH domain still uses the existing transmission and reception technologies, and uses the original PDCCH resources, such as the transmission diversity when transmitting, and the CRS (Cell Reference Signal) based on the CRS (Cell Reference Signal). The public search space and the user-specific search space perform blind detection on the DCI, occupying the first N OFDM symbols, where N may take values of 1, 2, 3, 4, and N=4 is only allowed to appear in the system bandwidth of 1.4 MHz. In the system, this part of the PDCCH domain is called a legacy PDCCH domain.

The enhanced PDCCH domain can use more advanced transmission and reception technologies, such as precoding at the time of transmission, detection based on DM-RS at the time of reception, and time-frequency resource transmission outside the legacy PDCCH domain, and using some resources of the original PDSCH. And multiplexing with the PDSCH by frequency division, this part of the PDCCH domain is called an Enhanced (PDCCH) PDCCH domain. Figure 2 shows the enhanced PDCCH resource occupation mode. The scheme in which the Enhanced PDCCH and the PDSCH are multiplexed by frequency division is called FDM E-PDCCH.

In the FDM E-PDCCH scheme, each downlink control information DCI in the Enhanced PDCCH region occupies at least one physical resource block PRB (Physical Resource Block) pair. On the one hand, each DCI contains fewer original bits (DCI format 1C is generally a dozen bits, and a larger DCI format such as 2/2C generally does not exceed 60 bits). On the other hand, there are more resources in each PRB pair, as shown in Table 1. When the DCI transmission is performed according to the existing FDM E-PDCCH scheme, the frequency efficiency is too low, resulting in waste of resources.

Table 1 Number of REs that each PRB pair can use for E-PDCCH transmission (conventional CP)

To solve this problem, each PRB pair can be divided into thousands of sub-blocks according to the frequency domain, which is called a sub-RB pair (sub-resource pair). Each DCI can be transmitted by one or more sub-RB pairs, so that one PRB pair can be used at most. Transfer multiple DCIs. The resource allocation of the E-PDCCH region is in units of subRB pairs, and the precoding granularity of the data is in units of subRB pairs or thousands of subRB pairs, as shown in FIG. 3 . However, there is currently no subRB pair based resource allocation method and blind detection scheme to support the sub-RB pair based E-PDCCH transmission scheme. Summary of the invention

The present invention provides a method and an apparatus for transmitting downlink control information, and provides a resource allocation method and a blind detection scheme based on a subRB pair to support an E-PDCCH transmission scheme based on a subRB pair.

The present invention provides a downlink control information sending method, including:

Allocating an available resource cluster to the enhanced physical downlink control channel E-PDCCH of the receiving end, and notifying the receiving end of the location information of the resource cluster, where the resource cluster includes a resource part, and each resource part is composed of N _SRBP sub-resource blocks SubRB pair consists of N _c and N SRBP are positive integers;

Allocating resources for the downlink control information in the resource cluster, and transmitting downlink control information to the receiving end on the allocated resources, where the minimum unit of the allocated resources is the subRB pair is the smallest unit, and the aggregation level is Refers to the number of subRB pairs included in the allocated resource.

The present invention also provides a downlink control information receiving method, including:

Receiving location information of a resource cluster allocated for the E-PDCCH transmitted by the transmitting end, where the resource cluster includes ^^ resource parts, each resource part is composed of N _SRBP sub-resource blocks to subRB pairs, and N _c and N _SRBP are a positive integer; determining, according to the location information of the resource cluster, a resource that is available for transmitting downlink control information;

The sub-RB pair is used as a minimum unit, and the downlink control information is obtained by blind detection in the available resources based on the optional aggregation level.

The present invention also provides a downlink control information transmitting apparatus, including:

An available resource notification unit, configured to allocate an available resource cluster to the enhanced physical downlink control channel E-PDCCH of the receiving end, and notify the receiving end of the location information of the resource cluster, where the resource cluster includes a resource part, and each resource part The sub-RB pair is composed of N _SRB p sub-resource blocks, and N _c and N _SRBP are positive integers;

The allocation transmission unit allocates resources for the downlink control information in the resource cluster according to the determined aggregation level, and transmits downlink control information to the receiving end on the allocated resources, where the minimum unit of the allocated resources is the subRB pair is the minimum unit. The aggregation level refers to the number of subRB pairs included in the allocated resources.

The present invention also provides a downlink control information receiving apparatus, including:

a resource notification receiving unit, configured to receive location information of a resource cluster allocated for the E-PDCCH transmitted by the transmitting end, where the resource cluster includes a resource part, and each resource part is composed of N _SRBP sub-resource blocks and subRB pairs, N _c , N _SRBP are positive integers;

An available resource determining unit, configured to determine, according to location information of the resource cluster, a resource that is available for transmitting downlink control information; The downlink information acquiring unit is configured to obtain the downlink control information in a blind detection manner in the available resources based on the optional aggregation level.

The downlink control information transmission method and device provided by the present invention have the following beneficial effects: providing a sub-RB pair-based downlink control information transmission and reception method, thereby supporting a sub-RB pair-based E-PDCCH transmission scheme, and effectively improving the PDCCH channel capacity, The capacity and transmission efficiency of the PDSCH of the LTE-A system will be greatly improved. DRAWINGS

1 is a schematic diagram of a multiplexing relationship between a control area and a data area in a downlink subframe of an LTE/LTE-A system; FIG. 2 is a schematic diagram of an enhanced PDCCH structure;

3 is a schematic diagram of a subRB pair obtained by dividing a PRB pair into thousands of sub-blocks;

4 is a flowchart of a method for transmitting downlink control information according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an E-PDCCH resource cluster according to an example in the embodiment of the present invention;

6 is a flowchart of a method for receiving downlink control information according to an embodiment of the present invention;

7 is a structural diagram of a method for transmitting downlink control information according to an embodiment of the present invention;

FIG. 8 is a structural diagram of a method for receiving downlink control information according to an embodiment of the present invention. detailed description

The downlink control information transmission method and apparatus provided by the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

As before, in the LTE/LTE-A system, the original PDCCH refers to a PDCCH having a TDM relationship with the PDSCH, and the E-PDCCH is a PDCCH having a frequency division multiplexing relationship with the PDSCH. In order to improve the transmission efficiency of the E-PDCCH, a method for transmitting downlink control information is to divide each PRB pair into thousands of sub-blocks according to a frequency domain, which is called a sub-resource block pair subRB pair, and the downlink control information DCI may be One or more subRB pair transmissions. However, there is currently no resource allocation method and blind detection scheme based on subRB pair to support the sub-RB pair based E-PDCCH transmission scheme. The embodiment of the present invention provides a method for transmitting and receiving downlink control information, so as to provide a resource allocation method and a blind detection scheme based on a subRB pair to support a sub-RB pair-based E-PDCCH transmission scheme.

As shown in FIG. 4, the method for transmitting downlink control information provided by the embodiment of the present invention specifically includes:

Step 401: Allocate a resource cluster for the E-PDCCH of the receiving end, and notify the receiving end of the location information of the resource cluster, where the resource cluster includes N _c resource parts, and each resource part is composed of N _SRBP subRB pairs, N _c , N _SRBP Are positive integers;

Each of the PRBs is divided into thousands of sub-blocks in the frequency domain to obtain a sub-RB pair. In the embodiment of the present invention, the number of sub-RB pairs included in each resource part of the cluster part is the same, and when multiple sub-RB pairs are included, preferably, many The subRB pairs are consecutive, and the frequency domain interval between two adjacent cluster parts may be the same or different.

Specifically, specific values of the foregoing N _e and N _SRBP may be determined as needed.

Specifically, the location information of the resource cluster may be notified to the receiving end by high layer signaling.

Step 402: Allocate resources for the downlink control information in the resource cluster according to the determined aggregation level, and transmit downlink control information to the receiving end on the allocated resources. The minimum unit of the allocated resources is a subRB pair, and the aggregation level refers to the The number of subRB pairs included in the allocated resource.

The embodiment of the present invention provides a method for transmitting downlink control information based on a subRB pair, so as to support E-PDCCH data transmission based on the subRB pair, effectively improving the PDCCH channel capacity, and making the capacity and transmission efficiency of the PDSCH of the LTE-A system large. Increase in range.

The location information of the allocated resource cluster is notified to the receiving end in a plurality of manners, as long as the location of each resource part in the resource cluster allocated by the notification receiving end can be realized.

Preferably, in the embodiment of the present invention, the value of Nc and the starting position of each resource part in the resource cluster are notified to the receiving end, such as the number of the starting subRB pair of each resource part in the resource cluster in the resource cluster. Or the physical resource block PRB number where the starting subRB pair is located in each resource part of the resource cluster and the number of the starting subRB pair in the PRB are notified to the receiving end.

Preferably, when the frequency domain interval of each adjacent two resource parts is the same, the value of N _e , the frequency domain interval of two adjacent resource parts, and the start position of a predetermined resource part in the resource cluster are notified and received. end. For example, the number of the starting subRB pair of the predetermined resource part in the resource cluster, or the PRB number of the starting subRB pair of the predetermined resource part and the number of the starting subRB pair in the PRB are notified to the receiving end.

Preferably, N _c takes a predetermined value, and when the frequency domain interval of each adjacent two resource parts takes a predetermined value, the two predetermined values are usually different, and the starting position of a predetermined resource part in the resource cluster is notified to the receiving end. For example, the number of the starting subRB pair of the predetermined resource part in the resource cluster, or the PRB number of the starting subRB pair of the predetermined resource part and the number of the starting subRB pair in the PRB are notified to the receiving end.

Preferably, N _c takes a predetermined value, and when the frequency domain interval of each adjacent two resource parts is not the same, the starting position of each resource part in the resource cluster is notified to the receiving end, such as each resource part in the resource cluster. The number of the starting subRB pair in the resource cluster, or the physical resource block PRB number in which the starting subRB pair is located in each resource part of the resource cluster, and the number of the starting subRB pair in the PRB are notified to the receiving end.

Preferably, N _c takes a predetermined value, and when the frequency domain interval of each adjacent two resource parts is the same, the frequency domain interval of two adjacent resource parts and the start position of a predetermined resource part in the resource cluster are notified to the receiving end. For example, the number of the starting subRB pair of the predetermined resource part in the resource cluster, or the PRB number of the starting subRB pair of the predetermined resource part and the number of the starting subRB pair in the PRB are notified to the receiving end. Preferably, a predetermined resource part in the resource cluster is specifically a first resource part sorted from a low frequency to a high frequency in a frequency domain in the resource cluster, or a first resource part sorted from a high frequency to a low frequency in a frequency domain. . Of course, it can also be a reserved part of another resource, such as the middle part of the resource.

The predetermined value taken by the above N _C may be a fixed value set, or a value calculated according to a predetermined rule, etc., so that it can be agreed with the user terminal in advance without further notification.

Preferably, each time the resource cluster is allocated to the E-PDCCH of the receiving end, the value of the N _SRBP is a fixed value or a dynamic value configured by signaling. The value of the N _SRBP may be determined according to an optional value of the aggregation level, such as any value of the aggregation level of the PDCCH or a multiple thereof, or a value of the aggregation level fixed to the PDCCH or a multiple thereof. According to current standards, the aggregation level of the legacy PDCCH includes 1, 2, 4, and 8. Preferably, if the aggregation level of the legacy PDCCH is reused, each time the resource cluster is allocated to the E-PDCCH of the receiving end, the value of the N _SRBP may be 1, 2, 4, 8, or 16, etc., and may be fixed to 1, 2, One of 4, 8, and 16 takes a value, and the value of the N _SRBP may be notified to the receiving end by higher layer signaling, or may not be notified.

Preferably, the frequency domain interval between two adjacent resource parts in the resource cluster is an integer multiple of the subRB pair.

Preferably, the downlink control information includes downlink scheduling information (DL grant) and/or uplink scheduling information (UL grant); and when the uplink scheduling information and the downlink scheduling information are included, the resources allocated for the downlink scheduling information are allocated for the uplink scheduling information. Resources do not overlap each other.

Preferably, the resource allocated for the downlink scheduling information includes the first subRB pair of one of the resource parts; and/or, the resource allocated for the uplink scheduling information does not include the first subRB pair of any one of the resource parts.

In the embodiment of the present invention, for the downlink scheduling information, one resource part is selected among the available resources, and 1~N _DL consecutive subRB pairs of the resource part are allocated to the downlink scheduling information, where N _D L < N _SRBP , where N _DL The aggregation level of the downlink scheduling information determined.

In the embodiment of the present invention, for the uplink scheduling information, one resource part is selected among the available resources, and L~L+N _UL subRB pairs in the resource part are allocated to the uplink scheduling information, where N _UL is the aggregation of the determined uplink scheduling information. Level, N _UL < N _SRBP , L is an integer greater than 1, taking values from a predetermined range.

Specifically, the aggregation level used by the upper grant and the DL grant may be respectively determined according to the original bit number of the UL grant and the DL grant and the subRB pair size.

Specifically, the value of the N _{DL is} a value of the original PDCCH aggregation level; the value of the N _{UL is} a value of the original PDCCH aggregation level. Of course, you can also define new aggregation level values.

For the DL grant, for each of the optional aggregation levels, the range of the value of the subRB pair corresponding to each aggregation level may be further defined. For the UL grant, the range of the value of the subRB pair corresponding to each aggregation level is further defined. Thereby, the search space is limited, and the number of blind detections of the user terminal is less, the speed is faster, and the complexity is lower. Give An example of a search space for the DL grant and the UL grant after the search space is defined according to the E-PDCCH available resource allocation manner in the foregoing embodiment of the present invention.

Example 1:

As shown in FIG. 5, each resource part cluster part is composed of 8 sub resource blocks and subRB pairs.

For DLgrant:

a) If the aggregation level is 1, the resource that may be allocated is {1}, that is, the subRB pair with the number 1 of each cluster part in the resource cluster;

b) If the aggregation level is 2, the resources that may be allocated are {1, 2}, that is, the subRB pair with the number 1 and 2 of each cluster part in the resource cluster;

c) If the aggregation level is 4, the resources that may be allocated are {1, 2, 3, 4}, that is, the subRB pair with the number 1, 2, 3, 4 of each cluster part in the resource cluster;

d) If supported and there is an aggregation level of 8, the resources that may be allocated are {1, 2, 3, 4, 5, 6, 7, 8}, that is, the number of each cluster part in the resource cluster is 1, 2, 3 SubRB pairs of 4, 5, 6, 7, and 8.

In order to support the ability to use an aggregation level of 8, the subRB pair of each cluster part should be at least 8.

For UL grant:

a) If the aggregation level is 1, the resource that may be allocated is {2}, that is, the subRB pair with the cluster part number 2 in each resource cluster;

b) If the aggregation level is 2, the resources that may be allocated are {3, 4}, that is, the subRB pair with the cluster part number 3 and 4 in each resource cluster.

c) If the aggregation level is 4, the resources that may be allocated are {5,6,7,8}, that is, the subRB pair with the number 5, 6, 7, and 8 of each cluster part in the resource cluster.

d) If supported and there is an aggregation level of 8, the resources that may be allocated are {9,10,11,12,13,14,15,16}, ie the number of each cluster part in the resource cluster is 9, 10, 11 SubRB pair of 12, 13, 14, 15, and 16.

In order to support the ability to schedule information up and down while using an aggregation level of 8, the subRB pair of each cluster part should be at least 16.

Example 2:

For DL grant:

a) If the aggregation level is 1, the resource that may be allocated is {1};

b) If the aggregation level is 2, the resources that may be allocated are {1, 2};

c) If the aggregation level is 4, the resources that may be allocated are {1, 2, 3, 4};

d) If supported and there is an aggregation level of 8, the resources that may be allocated are {1, 2, 3, 4, 5, 6, 7, 8}. For UL grant:

a) If the aggregation level is 1, the resource that may be allocated is {2};

b) If the aggregation level is 2, the resources that may be allocated are {3, 4} or {5, 6};

c) If the aggregation level is 4, the resources that may be allocated are {3, 4, 5, 6} or {5, 6, 7, 8};

d) If supported and there is an aggregation level of 8, the resources that may be allocated are {5,6,7,8,9,10,11, 12} or

{9,10,11,12,13,14,15,16}.

Example 3:

For DL grant:

a) If the aggregation level is 1, the resource that may be allocated is {1};

d) If supported and there is an aggregation level of 8, the resources that may be allocated are {1, 2, 3, 4, 5, 6, 7, 8}.

For UL grant:

a) If the aggregation level is 1, the resource may be allocated as {2} or {3}

b) If the aggregation level is 2, the possible resources are {3, 4} or {5, 6}

c) If the aggregation level is 4, the possible resources are {3, 4, 5, 6} or {5, 6, 7, 8}

d) If supported and there is an aggregation level of 8, the possible resources are {5,6,7,8,9,10,11, 12} or {9,10,11,12,13,14,15,16 }.

Example 4:

For DL grant:

a) If the aggregation level is 1, the resource that may be allocated is {1};

For UL grant:

a) If the aggregation level is 1, the resources that may be allocated (such as the time-frequency granularity of the enhanced PDCCH resource shown in Figure 4) are {2} or {3}; b) If the aggregation level is 2, the resources that may be allocated are {3, 4} or {5, 6};

c) If the aggregation level is 4, the resources that may be allocated are {5,6,7,8} or {9,10,11, 12};

In the embodiment of the present invention, when the search space is limited, the sub-RB pairs that may be allocated by the uplink scheduling information and the downlink scheduling information are not overlapped and adjacent. The manner of defining the search space is not limited to the manner given in the above example. Of course, it may not be limited, that is, the user terminal performs blind detection on all available resources according to the aggregation level on the available resources.

The method for transmitting the downlink control information provided by the foregoing embodiment of the present invention, the embodiment of the present invention further provides a method for receiving the downlink control information, as shown in FIG. 6, including:

Step 601: Receive location information of a resource cluster allocated by the transmitting end for the E-PDCCH, where the resource cluster includes N _c resource parts, each resource part is composed of N _SRBP subRB pairs, and N _c and N _SRBP are positive integers. ;

Step 602: Determine, according to location information of the resource cluster, a resource that is available for transmitting downlink control information.

Through the location information of the resource cluster, the location of each resource part can be determined, so that resources that the base station may use for downlink control information resource allocation can be determined.

Step 603: The sub-RB pair is used as a minimum unit, and the downlink control information is obtained by blind detection in the available resources based on the optional aggregation level.

The embodiment of the present invention provides a downlink control information receiving method based on a subRB pair, thereby supporting E-PDCCH data reception based on the subRB pair, effectively improving the PDCCH channel capacity, and greatly improving the capacity and transmission efficiency of the PDSCH of the LTE-A system. Improvement.

The specific content of the location information of the resource cluster participates in the description of the previous embodiment, and details are not described herein again.

Specifically, for each of the selectable aggregation levels, downlink control information is obtained in a blinded manner within the available resources until a DCI is detected or all possible detections are completed.

Preferably, the downlink control information includes downlink scheduling information and/or uplink scheduling information, where: the resources available for the downlink scheduling information are N _DL subRB pairs including the first subRB pair of the resource part, where DL' is All possible values of the aggregation level of the downlink scheduling information, N _DU <NSRBP; The resources available for the uplink scheduling information are Nm subRB pairs of the first subRB pair that do not include the resource part, where Nuu is the aggregation of the uplink scheduling information. All possible values for the level, Nuu < N _S RBPo

Preferably, the resources available for the downlink scheduling information are 1~N _DU consecutive subRB pairs for each resource part, and the user terminal performs detection on the 1~N _DU consecutive subRB pairs of each resource part until the downlink is detected. Control letter Interest DCI or complete all possible tests.

Preferably, the available resources of the uplink scheduling information are L L+Nuu consecutive subRB pairs of each resource part, and L is an integer greater than 1, and takes a value from a predetermined range. Then, the user terminal performs detection on the L L+Nu consecutive subRB pairs of each resource part until the DCI is detected or all possible detections are completed.

Specifically, if the aggregation level of the legacy PDCCH is reused, DL' may take values 1, 2, 4, and 8, and N _UL ' may take values 1, 2, 4, and 8.

If the search space is defined, the user terminal performs a blind check in the defined search space, such as the blind check number {1 }, { 1, 2}, { 1, 2, 3, 4 within each cluster part range. } and the subRB pair of { 1,2,3,4,5,6,7,8}, assuming that a total of 2 resource parts are allocated, and the size of each resource part is not less than 8 subRB pairs, then the downlink blindness is completed. The test requires a maximum of 2*2*4=16 blind checks, where the first 2 indicates that two types of downlink DCI need to be blindly detected, the second 2 indicates a total of 2 resource parts, and 4 indicates that there are 4 possible E- PDCCH channel resource.

In the following, in conjunction with the examples 1 to 4 of the search space given above, examples 1 to 4 of blind detection of the user terminal are given correspondingly. Example 1 :

For the search space in the previous example 1, it is assumed that a total of two resource parts are allocated, and the size of each resource part is not less than 16 subRB pairs. If uplink MIMO transmission is supported, the maximum uplink blind detection is required to be 2*2*4= 16 times of blind detection, wherein the first 2 indicates that two types of uplink DCI need to be blindly detected when supporting uplink MIMO transmission, the second 2 indicates a total of 2 resource parts, and 4 indicates that there are 4 possible E-PDCCH channel resources; If uplink MIMO transmission is not supported, the uplink blind detection needs to be 1*2*4=8 blind detections at most, 1 means that one uplink DCI needs to be blindly detected when uplink MIMO transmission is not supported, and 2 indicates two resource parts, 4 Indicates that there are 4 possible E-PDCCH channel resources.

Example 2:

Similarly, for the search space in the previous example 2, it is assumed that a total of two resource parts are allocated, and the size of each resource part is not less than 16 subRB pairs. If uplink MIMO transmission is supported, the uplink blind detection needs to be up to 2*2. *7=28 blind checks, where the first 2 indicates that the uplink MIMO transmission is required to detect 2 uplink DCIs blindly, the second 2 indicates a total of 2 resource parts, and 7 indicates that there are 7 possible E- PDCCH channel resource; if uplink MIMO transmission is not supported, the uplink blind detection needs to complete 1*2*7=14 blind detections at most, 1 means that one uplink DCI needs to be blindly detected when uplink MIMO transmission is not supported, and 2 indicates 2 resources. In part, 7 indicates that there are a total of 7 possible E-PDCCH channel resources.

Example 3:

Similarly, for the search space in the previous example 3, it is assumed that a total of two resource parts are allocated, and the size of each resource part is not less than 16 subRB pairs. If uplink MIMO transmission is supported, the uplink blind detection needs to be completed at most 2 *2*8=32 blind detections, where the first 2 indicates that the uplink MIMO transmission is required to detect 2 uplink DCIs blindly, the second 2 Indicates a total of 2 resource parts, 8 means that there are 8 possible E-PDCCH channel resources; if uplink MIMO transmission is not supported, then the uplink blind detection needs to complete 1 * 2 * 8 = 16 blind detections, 1 means no When uplink MIMO transmission is supported, one type of uplink DCI needs to be blindly detected, 2 indicates 2 resource parts, and 8 indicates that there are 8 possible E-PDCCH channel resources.

Example 4:

Similar to the example 3, for the search space in the foregoing example 4, it is assumed that a total of two resource parts are allocated, and the size of each resource part is not less than 16 subRB pairs. If uplink MIMO transmission is supported, the uplink blind detection is completed. A maximum of 2*2*8=32 blind detections are required. The first 2 indicates that the uplink MIMO transmission is required to detect 2 uplink DCIs blindly, the second 2 indicates a total of 2 resource parts, and 8 indicates a total of 8 If the uplink MIMO transmission is not supported, the uplink blind detection needs to complete 1 * 2 * 8 = 16 blind detections, and 1 indicates that the uplink MIMO transmission is not supported, and one uplink DCI needs to be detected blindly. 2 denotes 2 resource parts, and 8 denotes a total of 8 possible E-PDCCH channel resources.

Based on the same inventive concept, the embodiment of the present invention further provides a downlink control information sending apparatus and a downlink control information receiving apparatus. The principle of solving the problem by these apparatuses, a downlink control sending method, and a downlink control information receiving The method is similar, so the implementation of these devices can be referred to the implementation of the method, and the repeated description will not be repeated.

As shown in FIG. 7, the downlink control information sending apparatus provided by the embodiment of the present invention includes:

The available resource notification unit 701 is configured to allocate a resource cluster to the enhanced physical downlink control channel E-PDCCH of the receiving end, and notify the receiving end of the location information of the resource cluster, where the resource cluster includes N _e resource parts, and each resource part is N _SRBP The sub-resource blocks are composed of subRB pairs, and N _c and N _SRBP are positive integers;

The allocation transmission unit 702 allocates resources for downlink control information in the resource cluster according to the determined aggregation level, and transmits downlink control information to the receiving end on the allocated resources, and the minimum unit of the allocated resources is a subRB pair, and the aggregation level is Refers to the number of subRB pairs included in the allocated resource.

Preferably, the downlink control information transmitting device is an evolved base station in the LTE-A system.

As shown in FIG. 8, the downlink control information receiving apparatus provided by the embodiment of the present invention includes:

The resource notification receiving unit 801 is configured to receive location information of a resource cluster allocated for the E-PDCCH transmitted by the transmitting end, where the resource cluster includes N _e resource parts, and each resource part is composed of N _SRBP sub-resource blocks and subRB pairs, N _c ,

N _SRBP is a positive integer;

The available resource determining unit 802 is configured to determine, according to the location information of the resource cluster, the resources available for transmitting the downlink control information;

The downlink information obtaining unit 803 is configured to obtain downlink control information by using a sub-RB pair as a minimum unit and performing blind detection in the available resources based on the optional aggregation level. Preferably, the downlink control information receiving device is a user terminal in the LTE-A system.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

A method for transmitting downlink control information, which is characterized by:

Allocating a resource cluster to the enhanced physical downlink control channel E-PDCCH of the receiving end, and notifying the receiving end of the location information of the resource cluster, where the resource cluster includes a resource part, and each resource part is composed of N _SRBP sub-resource blocks to subRB Pair constitutes, N _c , N _SRBP are positive integers;

Allocating resources for the downlink control information in the resource cluster, and transmitting downlink control information to the receiving end on the allocated resources, the minimum unit of the allocated resources is a subRB pair, and the aggregation level refers to the allocated The number of subRB pairs included in the resource.

2. The method according to claim 1, wherein the location information of the resource cluster is notified to the receiving end, and specifically includes:

The value of Nc and the starting position of each resource part in the resource cluster are notified to the receiving end.

The method according to claim 1, wherein the frequency domain interval is the same for each of the two adjacent resource parts; and the location information of the resource cluster is notified to the receiving end, specifically:

The value of N _c , the frequency domain interval of two adjacent resource parts, and the starting position of a predetermined resource part in the resource cluster are notified to the receiving end.

The method according to claim 1, wherein N _e takes a predetermined value, and a frequency domain interval of each adjacent two resource parts takes a predetermined value;

Notifying the receiving end of the location information of the resource cluster, including:

Notifying the receiving end of the starting position of a predetermined resource portion in the resource cluster.

5. The method according to claim 1, wherein N _e takes a predetermined value, and the frequency domain interval of each adjacent two resource parts is not satisfied;

Notify the receiving end of the starting position of each resource part in the resource cluster.

6. The method according to claim 1, wherein N _e takes a predetermined value, and the frequency i or interval of each adjacent two resource parts is the same;

The frequency domain interval of two adjacent resource parts and the start position of a predetermined resource part in the resource cluster are notified to the receiving end.

The method according to any one of claims 2 to 6, wherein the starting position of the resource part is specifically the number of the starting subRB pair of the resource part in the resource cluster, or the starting part of the resource part The physical resource block PRB number where the pair is located and the number of the starting subRB pair in the PRB.

The method according to claim 1, wherein each time the resource cluster is allocated to the E-PDCCH of the receiving end, the value of the N _SRBP is a fixed value or a dynamic value configured by signaling.

The method according to claim 1, wherein a frequency domain interval between two adjacent resource parts in the resource cluster is an integer multiple of a subRB pair.

The method according to claim 1, wherein the downlink control information includes downlink scheduling information and

/ or uplink scheduling information;

When the uplink scheduling information and the downlink scheduling information are included, the resources allocated for the downlink scheduling information and the resources allocated for the uplink scheduling information do not overlap each other.

11. The method of claim 10, wherein

The resource allocated for the downlink scheduling information includes the first subRB pair of one of the resource parts;

And / or, the resource allocated for the uplink scheduling information does not include the first subRB pair of any one of the resource parts.

The method according to claim 11, wherein the resource allocated for the downlink scheduling information is the first to the Nth _DL consecutive subRB pairs of one of the resource parts, where N _DL is the aggregation level of the downlink scheduling information.

The method according to claim 11, wherein the resource allocated for the uplink scheduling information is the L~L+N _UL subRB pair of one of the resource parts, where N _UL is an aggregation level of the uplink scheduling information, L is an integer greater than 1, taking values from a predetermined range.

A downlink control information receiving method, comprising:

Receiving, by the transmitting end, location information of a resource cluster allocated for enhancing the physical downlink control channel E-PDCCH, where the resource cluster includes N _e resource parts, and each resource part is composed of N _SRBP sub-resource blocks and subRB pairs, N _c , N _SRBP are positive integers;

Determining, according to location information of the resource cluster, resources available for transmitting downlink control information;

The method according to claim 14, wherein the location information of the resource cluster is specifically a value of N _e and a starting position of each resource part in the resource cluster.

The method according to claim 14, wherein when the frequency domain interval of each adjacent two resource parts is the same, the location information of the resource cluster is specifically a value of N _c and two adjacent resources. Part of the frequency domain interval, the starting position of a predetermined resource portion within the resource cluster.

The method according to claim 14, wherein the N _e takes a predetermined value, and when the frequency domain interval of each adjacent two resource parts takes a predetermined value, the location information of the resource cluster is specifically a resource cluster. The starting position of a reserved resource part within.

The method according to claim 14, wherein N _e takes a predetermined value, and if the frequency domain interval of each adjacent two resource parts is not the same, the location information of the resource cluster is specifically The starting position of the resource section.

The method according to claim 14, wherein N _e takes a predetermined value, and when the frequency domain interval of each adjacent two resource parts is the same, the location information of the resource cluster is specifically two adjacent resource parts. The frequency domain interval, the starting position of a predetermined resource portion within the resource cluster.

The method according to claim 14, wherein the downlink control information includes downlink scheduling information and/or uplink scheduling information, where:

The NBR is the N _DL subRB pair including the first subRB pair of the resource part, where the N _DL is all possible values of the aggregation level of the downlink scheduling information;

The resource available for the uplink scheduling information is the N _UL subRB pair of the first subRB pair that does not include the resource part, where N _UL is all possible values of the aggregation level of the uplink scheduling information.

21. The method of claim 20, wherein

The resources available for the downlink scheduling information are 1~N _DU consecutive subRB pairs of each resource part;

The resources available for the uplink scheduling information are L L+Nu consecutive subRB pairs of each resource part, and L is an integer greater than 1, and takes values from a predetermined range.

22. A downlink control information transmitting apparatus, comprising:

The available resource notification unit is configured to allocate a resource cluster to the enhanced physical downlink control channel E-PDCCH of the receiving end, and notify the receiving end of the location information of the resource cluster, where the resource cluster includes N _e resource parts, and each resource part The sub-RB pair is composed of N _SRB p sub-resource blocks, and N _c and N _SRBP are positive integers;

The allocation transmission unit allocates resources for the downlink control information in the resource cluster according to the determined aggregation level, and transmits downlink control information to the receiving end on the allocated resources, and the minimum unit of the allocated resources is a subRB pair, an aggregation level. Refers to the number of subRB pairs included in the allocated resource.

The device according to claim 22, wherein the available resource notification unit is specifically configured to: notify the receiving end of the value, the starting position of each resource part in the resource cluster.

The apparatus according to claim 22, wherein each of the two resource parts has the same frequency domain interval, and the available resource notification unit is specifically configured to:

The apparatus according to claim 22, wherein Nc takes a predetermined value, and a frequency domain interval of each adjacent two resource parts takes a predetermined value; The available resource notification unit is specifically used to:

The apparatus according to claim 22, wherein N _e takes a predetermined value, and the frequency domain interval of each adjacent two resource parts is not satisfied;

The available resource notification unit is specifically configured to: notify the receiving end of the starting position of each resource part in the resource cluster.

27. The apparatus according to claim 22, wherein N _e takes a predetermined value, and a frequency domain interval of each adjacent two resource parts is the same;

The available resource notification unit is specifically used to:

28. A downlink control information receiving apparatus, comprising:

An available resource determining unit, configured to determine, according to the location information of the resource cluster, a resource that is available for transmitting downlink control information;

The downlink information obtaining unit is configured to obtain the downlink control information in a blind check manner in the available resources based on the optional aggregation level, using the subRB pair as a minimum unit.

The device according to claim 28, wherein the downlink control information includes downlink scheduling information and/or uplink scheduling information;

The available resource determining unit is specifically configured to: the available resources of the determined downlink scheduling information, which are N _DU subRB pairs including the first subRB pair of the resource part, where N _DU is all possible of the aggregation level of the downlink scheduling information The value of the available uplink scheduling information is the Nuu subRB pair of the first subRB pair that does not include the resource part, where N _UL is all possible values of the aggregation level of the uplink scheduling information.

30. Apparatus according to claim 29 wherein:

The available resource determining unit is specifically configured to: determine the available resources of the downlink scheduling information, and use 1 to N _DU consecutive subRB pairs for each resource part; determine available resources of uplink scheduling information, and use L for each resource part. ~L+Nuu consecutive subRB pairs, L is an integer greater than 1, taking values from a predetermined range.