WO2011134387A1

WO2011134387A1 - Method, system and device for transmitting and detecting control signaling over backhaul link

Info

Publication number: WO2011134387A1
Application number: PCT/CN2011/073323
Authority: WO
Inventors: 沈祖康; 王立波; 潘学明; 肖国军; 张文健
Original assignee: 电信科学技术研究院
Priority date: 2010-04-30
Filing date: 2011-04-26
Publication date: 2011-11-03
Also published as: CN102082642A; CN102082642B

Abstract

The present invention, which relates to the field of wireless communications, discloses a method for transmitting and detecting control signaling over a backhaul link, and the method is used to solve the problem how to transmit and detect the UpLink Grant (UL Grant) over the backhaul link. In the present invention, an evolved Node B (eNB) transmits the UL Grant to a Relay Node (RN) in the first resource region or in the second resource region, wherein the first resource region is located in the first slot of the downlink subframe, and the second resource region is located in the second slot of the downlink subframe; the RN detects the UL Grant in the search space constituted by the first resource region and the second resource region. The present invention has solved the problem how to transmit and detect the UL Grant over the backhaul link.

Description

Control signaling transmission and detection method, system and device on a backhaul link This application claims to be submitted to the Chinese Patent Office on April 30, 2010, the application number is 201010164444.0, and the invention name is "control signaling transmission on the backhaul link" The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference. Technical field

The present invention relates to the field of wireless communications, and in particular, to a control signaling transmission and detection method, system and device on a backhaul link. Background technique

In the Advanced Long Term Evolution (LTE-A) system, in order to improve system throughput and increase network coverage, a Relay Node (RN) is introduced. As shown in Figure 1, the base station (Evolved Node) B, eNB) is connected to the core network (Core Network, CN) through a wired interface, and the RN is connected to the eNB through a wireless interface; a User Equipment (UE) is connected to the RN or the eNB through a wireless interface.

The link between the RN and the base station is called a backhaul link, and includes a downlink backhaul link from the base station to the RN and an uplink backhaul link from the RN to the base station. The link between the RN and the UE is called an access link. The downlink access link of the RN to the UE and the uplink access link of the UE to the RN are included.

In the backhaul link, there are two channels, namely, a physical downlink control channel (R-PDCCH) on the backhaul link and a physical downlink shared channel (R-PDSCH, relay physical downlink) on the backhaul link. Shared channel ). The eNB transmits the relevant control signaling to the RN by using the time-frequency resource occupied by the R-PDCCH, and the RN performs blind detection in the time-frequency resource range occupied by the R-PDCCH to obtain corresponding control signaling. The R-PDSCH may also be simply referred to as a PDSCH (physical downlink shared channel).

There are two ways to multiplex R-PDCCH and R-PDSCH: Figure 2 shows R-PDCCH and R-PDSCH. Time Division Multiplexing (TDM) + Frequency Division Multiplexing (Frequency) Schematic diagram of the multiplexing mode of the Division Mutiplexing, FDM); FIG. 3 is a schematic diagram of the FDM multiplexing mode of the R-PDCCH and the R-PDSCH.

The control signaling transmitted on the R-PDCCH includes downlink resource scheduling signaling (DL grant) and uplink resource scheduling signaling (UL grant), and the DL grant is currently configured in a physical resource block (Physical).

In the first time slot of the Resource Block, PRB, the delay of the signaling demodulation is short, so that the corresponding downlink data information is demodulated in time.

In the process of implementing the present invention, the inventors have found that the following technical problems exist in the prior art: In the current solution, how the UL grant on the backhaul link is transmitted has no specific implementation. Summary of the invention

The embodiment of the invention provides a method for transmitting control signaling on a backhaul link and a base station for solving the problem of how the UL grant on the backhaul link is transmitted.

A method for transmitting control signaling on a backhaul link, the method comprising:

Determining, by the base station, that the UL Grant is sent in the first resource region or the second resource region; the first resource region is located in a first time slot of the downlink subframe, and the second resource region is located in a downlink subframe Within two time slots;

The base station sends a UL Grant to the RN according to the determination result.

A base station, the base station comprising:

a region determining unit, configured to determine to send a UL Grant in a pre-configured first resource region or a second resource region; the first resource region is located in a first time slot of a downlink subframe, and the second resource region is located Within the second time slot of the downlink subframe;

And a signaling sending unit, configured to send, in the first resource area or the second resource area, a UL Grant to the RN according to the determination result of the area determining unit.

In this solution, the base station first determines that the UL Grant is sent in the first resource region or the second resource region, where the first resource region is located in the first time slot of the downlink subframe, and the second resource region is located in the downlink subframe. In the second time slot, then the base station is in the first resource area or the second according to the determination result. The UL Grant is sent to the RN in the resource area. It can be seen that the present invention implements the transmission of the UL Grant on the backhaul link.

The embodiment of the present invention further provides a control signaling detection method on a backhaul link, a relay node, and a wireless communication system, which are used to solve the problem of how the UL grant on the backhaul link is detected.

A method for detecting a control signaling on a backhaul link, the method comprising:

The relay node RN detects the UL Grant in the first search space and the second search space, where the first search space is located in the first time slot of the downlink subframe, and the second search space is located in the first time frame of the downlink subframe. Within two time slots.

A relay node, the relay node includes:

a first signaling detection unit, configured to detect a UL Grant in a first search space, where the first search space is located in a first time slot of the downlink subframe;

The second signaling detection unit is configured to detect the UL Grant in the second search space, where the second search space is located in the second time slot of the downlink subframe.

A wireless communication system, the system comprising:

a base station, configured to send an uplink resource scheduling signaling UL Grant in a pre-configured first resource region or a second resource region; and send a UL Grant to the relay node in the first resource region or the second resource region according to the determining result; The first resource region is located in a first time slot of a downlink subframe, and the second resource region is located in a second time slot of a downlink subframe;

The relay node is configured to detect the UL Grant in the first search space formed by the first resource area and the second search space formed by the second resource area.

In this solution, the RN detects the UL Grant in the first search space located in the first time slot and the second search space located in the second time slot, respectively. It can be seen that the present invention implements the UL Grant detection on the backhaul link, so that the RN can send uplink data according to the scheduling of the UL Grant. DRAWINGS

1 is a schematic structural diagram of an LTE-A system in the prior art; 2 is a schematic diagram of a TDM+FDM multiplexing mode in the prior art;

3 is a schematic diagram of a FDM multiplexing mode in the prior art;

4 is a schematic flowchart of a method according to an embodiment of the present invention;

FIG. 5A is a schematic diagram of resource configuration in Embodiment 1 of the present invention; FIG.

FIG. 5B is a schematic diagram of another resource configuration in Embodiment 1 of the present invention; FIG.

5C is a schematic diagram of resource configuration in Embodiment 2 of the present invention;

5D is a schematic diagram of another resource configuration in Embodiment 2 of the present invention;

FIG. 6 is a schematic structural diagram of a system according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of an RN according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a situation in which only a DL Grant exists in an embodiment of the present invention; FIG.

FIG. 10 is a schematic diagram of a situation in which a DL Grant and a UL Grant are simultaneously present in an embodiment of the present invention. detailed description

In order to implement the transmission of the UL grant on the backhaul link, the embodiment of the present invention provides a method for transmitting and detecting a control signaling on a backhaul link. In this method, the first time when the base station is used to carry the DL Grant in the downlink subframe The UL grant is sent to the RN in the slot or in the second slot, and the RN detects the UL grant in the first slot and in the second slot.

Referring to FIG. 4, a method for sending and detecting control signaling on a backhaul link according to an embodiment of the present invention includes the following steps:

Step 40: The base station determines to transmit the UL Grant in the pre-configured first resource region or in the second resource region. The first resource region is located in the first time slot in the downlink subframe for transmitting the DL Grant, and the second resource region is located. Within the second time slot of the downlink subframe;

The resource area in the present invention is composed of one or more PRBs, which may be consecutive PRBs or non-contiguous PRBs.

Step 41: The base station sends a UL Grant to the RN in the first resource area or the second resource area according to the determination result. Step 42: The RN detects the UL Grant in the first search space composed of the first resource region and the second search space composed of the second resource region.

Before detecting the UL Grant, the RN may determine a search space of the UL Grant according to the configuration signaling that is sent by the base station and the location information of the first resource region and the location information of the second resource region, where the search space includes the first resource region. a first search space and a second search space formed by the second resource area;

The location information of the resource region in the present invention includes time-frequency location information of the PRB constituting the resource region.

On the base station side:

The specific implementation of step 40 can be as follows:

The base station determines whether there is an available resource capable of carrying all or part of the UL Grant currently to be transmitted in the first time slot, and if yes, determines to send the UL Grant in the pre-configured first resource region, otherwise, the pre-configured second resource The UL Grant is sent in the area.

The first resource area and the resource area used to send the DL Grant may be completely coincident or partially coincident or completely independent.

When the first resource region and the resource region for transmitting the DL Grant are completely coincident, the base station needs to send the location information of the first resource region and the location information of the second resource region to the RN, to indicate that the RN is in the first resource region and Detecting UL Grant in the second resource area and detecting DL Grant in the first resource area

When the first resource region partially overlaps with the resource region for transmitting the DL Grant, the method further includes:

The base station sends the location information of the resource region for transmitting the DL Grant, the location information of the second resource region, and the location information of the third resource region to the RN, to indicate that the RN is in the resource region and the second resource region for sending the DL Grant. The UL Grant is detected in the third resource region, and the DL Grant is detected in the resource region for transmitting the DL Grant. The third resource region is a non-coincident region of the first resource region and the resource region for transmitting the DL Grant. The resource area for transmitting the DL Grant and the third resource area together constitute the first resource area. When the first resource region is completely independent of the resource region used to send the DL Grant, the method further includes:

The base station sends the location information of the first resource area and the location information of the second resource area to the RN, to instruct the RN to detect the UL Grant in the first resource area and the second resource area. Of course, the base station also needs to send location information of the resource region for transmitting the DL Grant to the RN, to indicate that the RN detects the DL Grant in the resource region for transmitting the DL Grant.

In the present invention, the base station may send the location information of each resource region to the RN by using semi-static configuration signaling.

In step 41, when the base station sends a UL Grant to the RN in the first resource region according to the determination result, the base station uses the resource element (Resource Element, RE) in the PRB for each physical resource block (PRB) in the first resource region. A UL Grant is sent to one or more RNs.

On the RN side:

In step 42, the first search space and the second search space are located in a frequency domain on a resource block (RB) used by a physical downlink control channel (R-PDCCH) on a base station transmission backhaul link.

The first search space is completely coincident or partially coincident or completely independent of the DL Grant's search space. When the first search space completely coincides with the search space of the DL Grant, the RN needs to detect the DL grant in the first search space.

The invention will be specifically described below:

In the specific implementation, the present invention has interleaving and non-interleaving, and uses a cell-specific reference signal (CRS) or a dedicated demodulation pilot (such as a Demodulation Reference Signal (DMRS)). Several situations. Since the use of pilots can be adjusted accordingly according to interleaving after determining whether or not to interleave, this patent only discusses the case of interleaving. That is, the scheme proposed in this patent is not directly related to the use of pilots, and can be applied to both CRS and DMRS.

Embodiment 1:

In this embodiment, in the case of interleaving, as shown in FIG. 5A, where in a PRB, DL grant at multiple relay nodes and UL grant for multiple relay nodes.

In this case, on the eNB side, when the UL grants of the plurality of relay nodes are relatively small, the UL grant is placed in the first time slot, and the DL grants of the plurality of relay nodes are interleaved. Specifically, as shown in FIG. 5B, the PRBs occupied by the R-PDCCH in the second slot are all idle, and the R-PDSCH can be transmitted.

As shown in FIG. 5B, the specific case is that although the eNB semi-statically configures multiple PRB pairs to transmit the R-PDCCH, the UL grant occupies less resources, and resources exist in the first time slot. UL grant, therefore, the eNB interleaves the UL grant and the DL grant, transmits in the first time slot, and transmits the R-PDSCH in the second time slot.

In this case, from the perspective of the relay node, there are multiple search spaces at the time of specific detection. First, for the DL grant search, its search space is in the first time slot. Second, for the UL grant, there are two search spaces, namely the search space in the first time slot and the search space in the second time slot.

The case of interleaving is generally the case of using CRS. Of course, DMRS can also be used to transmit the control signaling of the interlace. The CRS may be the CRS defined in R8 of the current LTE system, and the DMRS may be the DMRS of the R9.

Embodiment 2:

In this embodiment, in the case of no interleaving, from the perspective of the relay node, the control signaling of each relay node exists in one or several PRBs; from the perspective of the eNB, it is different. The control signaling of the relay node is configured in different PRBs. At this time, the eNB semi-statically configures multiple PRBs for a certain relay, and its corresponding downlink control signaling can be transmitted in these PRBs. Specifically, as shown in Figure 5C.

From the perspective of the eNB, if the UL grant configured for the relay 1 occupies less resources and the PRB occupied by the DL grant is partially idle, the corresponding UL grant can be configured in the first time slot. In the corresponding PRB, the R-PDSCH can be transmitted in the second time slot. Specifically, as shown in Fig. 5D.

The situation shown in Figure 5D can be avoided because of the efficiency of the overall data transmission. Waste of resources caused by idleness.

In this case, for the relay node 1, the range of the search space is similar to that in the case of interleaving, that is, the DL grant has one search space, and the UL grant has two search spaces, one in the first time slot. , one is located in the second time slot. The search space of the UL grant located in the first slot may completely coincide with the search space of the DL grant.

The case of non-interleaving is generally the case of using DMRS. Of course, CRS can also be used to transmit non-interleaved control signaling. The CRS may be the CRS defined in R8 of the current LTE system, and the DMRS may be the DMRS of the R9.

In summary, the specific process is as follows:

On the eNB side:

Step 1: The eNB configures the R-PDCCH resource semi-statically for the relay node.

Step 2: The eNB sends the DL grant to the relay node in the resource area S1, and sends the UL grant to the relay node in the resource area S2 or the resource area S3. The S1 and the S2 may be completely coincident, partially overlapped, or completely independent. Both S1 and S2 are located in the first time slot of the downlink subframe, and S3 is located in the second time slot of the downlink subframe.

On the relay side:

Step 1: The RN determines a search space of the DL grant and the UL grant according to the semi-static configuration signaling of the eNB, where the search space of the DL grant includes SI, and the search space of the UL grant includes S2 and S3;

Step 2: The RN detects the DL grant in the search space S1 in the first slot. The UL grant is detected in the search space S2 in the first slot and the search space S3 in the second slot, respectively.

Among them, it can be seen from the above description of the patent that S1 and S2 are identical. However, from an expansion perspective, S1 and S2 can also be completely independent, which corresponds to the UL grant being configured to be transmitted in a new resource region located in the first time slot. In this case, additional signaling is required to inform the frequency domain location of the resource area of the UL grant.

In addition, S1 and S2 may also be partially overlapped. This corresponds to the fact that after the DL grant is configured in the resource region S1, the remaining resources are insufficient to fully configure the UL grant, and only a partial UL grant can be configured. Therefore, there are still some remaining UL grants that need to be transmitted using the new resource area. Referring to FIG. 6, an embodiment of the present invention further provides a wireless communication system, where the system includes: a base station 60, configured to determine to send a UL Grant in a pre-configured first resource region or a second resource region; Transmitting a UL Grant to a relay node in a resource region or a second resource region; the first resource region is located in a first time slot in a downlink subframe for transmitting a DL Grant, and the second resource region is located in a downlink subframe Within the second time slot;

The relay node 61 is configured to detect the UL Grant in the first search space formed by the first resource area and the second search space formed by the second resource area, respectively.

The base station 60 is used to:

Determining whether there is an available resource capable of carrying all or part of the UL Grant currently to be sent in the first time slot, and if yes, determining to send the UL Grant in the pre-configured first resource region, otherwise, in the pre-configured second The UL Grant is sent in the resource area.

The first resource region is completely coincident or partially coincident or completely independent of the resource region for transmitting the DL Grant.

The base station 60 is also used to:

When the first resource region completely overlaps with the resource region for transmitting the DL Grant, the location information of the first resource region and the location information of the second resource region are transmitted to the relay node.

The relay node 61 is also used to:

The search space of the UL Grant is determined according to the location information of the first resource region and the location information of the second resource region.

The relay node 61 is also used to:

When the first resource region completely coincides with the resource region for transmitting the DL Grant, the DL grant is detected in the first search space.

Referring to FIG. 7, an embodiment of the present invention further provides a base station, where the base station includes:

The area determining unit 70 is configured to determine to send a UL Grant in a pre-configured first resource area or in a second resource area; the first resource area is located in a first time slot in a downlink subframe for transmitting a DL Grant, The second resource region is located in a second time slot of the downlink subframe;

a signaling sending unit 71, configured to be in the first resource area according to the determination result of the area determining unit Within the domain or the second resource region, a UL Grant is sent to the relay node.

The area determining unit 70 is configured to:

The base station also includes:

The first configuration unit 72 is configured to: when the first resource region and the resource region for transmitting the DL Grant are completely coincident, send the location information of the first resource region and the location information of the second resource region to the RN, to indicate that the RN is The UL Grant is detected in the first resource region and the second resource region.

The base station also includes:

a second configuration unit 73, configured to: when the first resource region partially overlaps with the resource region for transmitting the DL Grant, the location information of the resource region for transmitting the DL Grant, the location information of the second resource region, and the third resource The location information of the area is sent to the RN, to indicate that the RN detects the UL Grant in the resource area, the second resource area, and the third resource area used to send the DL Grant, where the third resource area is the first resource area and is used for sending A non-coincident area of the DL Grant's resource area.

The base station also includes:

The third configuration unit 74 is configured to: when the first resource region is completely independent of the resource region for transmitting the DL Grant, send the location information of the first resource region and the location information of the second resource region to the RN, to indicate that the RN is The UL Grant is detected in the first resource region and the second resource region.

The signaling sending unit 71 is configured to:

When the UL Grant is sent to the RN in the first resource region according to the determination result, the UL Grant is sent to the one or more RNs by using the PRB for each physical resource block PRB in the first resource region.

Referring to FIG. 8, an embodiment of the present invention further provides a relay node, where the relay node includes: The first signaling detection unit 80 is configured to detect a UL Grant in a first search space, where the first search space is located in a first time slot of the downlink subframe;

The second signaling detection unit 81 is configured to detect a UL Grant in a second search space, where the second search space is located in a second time slot of the downlink subframe.

The first search space and the second search space are located on the resource block RB used by the physical downlink control channel R-PDCCH on the base station transmission backhaul link in the frequency domain.

The search space of the first search space and the downlink resource scheduling signaling DL Grant is completely coincident or partially coincident or completely independent.

The first signaling detection unit 80 is further configured to:

When the first search space completely coincides with the search space of the DL Grant, the DL grant is detected in the first search space.

In summary, the beneficial effects of the present invention include:

In the solution provided by the embodiment of the present invention, the base station first determines to send the UL Grant in the pre-configured first resource region or the second resource region, where the first resource region is located in the downlink subframe for transmitting the first time slot of the DL Grant. The second resource region is located in the second time slot of the downlink subframe, and then the base station sends the UL Grant to the RN in the first resource region or the second resource region according to the determination result. It can be seen that the present invention implements the transmission of UL Grant on the backhaul link.

The RN detects the UL Grant in the first search space located in the first time slot and the second search space located in the second time slot, respectively. It can be seen that the invention implements the detection of the UL Grant on the backhaul link, so that the RN can send the uplink data according to the scheduling of the UL Grant.

The base station transmitting the UL Grant in the first resource area has the beneficial effect of avoiding waste of resources on the backhaul link and improving system resource utilization compared with sending the UL Grant in the second resource area. The specific analysis is as follows:

In a time division duplex (TDD) system, if a scheme for transmitting a UL Grant in a second resource region is used, for a configuration in which the number of uplink and downlink subframes is different, only a DL grant exists in some downlink subframes, and no UL exists. Grant, so there must be a situation as shown in Figure 9. In Figure 9, the DL grant is only transmitted in the first time slot, and the PRB occupied by it is blank in the second time slot. In the case of TDD systems, resource waste is too serious. If the scheme for transmitting the UL Grant in the first resource region is used, that is, both the DL grant and the UL grant are sent in the first time slot, the second time slot can be vacated for transmitting the R-PDSCH, which can be effective. Improve backhaul link resource utilization.

In the case where both the DL grant and the UL grant are present, the eNB semi-statically configures multiple PRB pairs, in which the corresponding DL grant and UL grant are transmitted. As shown in FIG. 10, the eNB semi-statically configures the signaling PRB pair of the DL grant and the UL grant through the high layer signaling, and the RN performs detection in the corresponding area. However, as shown in Figure 10, if the UL grant occupies less PRB in a certain period of time, the waste of resources in Figure 10 is also serious, similar to the situation in Figure 9. Similarly, if the scheme for transmitting the UL Grant in the first resource region is used, that is, both the DL grant and the UL grant are sent in the first time slot, the second time slot can be vacated for transmitting the R-PDSCH. , can effectively improve the back link resource utilization.

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 invention can be embodied in the form of one or more computer program products embodied on a computer-usable storage medium (including but not limited to disk storage and optical storage, etc.) in which computer usable program code is embodied.

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 flow and/or block of the flowcharts and/or block diagrams, and combinations of flow and/or blocks in the flowcharts and/or block diagrams can be implemented by computer program instructions. 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 device is implemented in a flow chart or Multiple processes and/or block diagrams The functions specified in one or more boxes.

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. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request

A method for transmitting control signaling on a backhaul link, the method includes: the base station determining to send an uplink resource scheduling signaling UL Grant in a pre-configured first resource region or in a second resource region; The first resource region is located in a first time slot of the downlink subframe, and the second resource region is located in a second time slot of the downlink subframe;

The base station transmits a UL Grant to the relay node RN according to the determination result.

2. The method according to claim 1, wherein the determining, by the base station, that the UL Grant is sent in the pre-configured first resource region or in the second resource region comprises:

The base station determines whether there is an available resource capable of carrying all or part of the UL Grant currently to be sent in the first time slot, and if yes, determining to send the UL Grant in the pre-configured first resource region, otherwise, in the pre-configured The UL Grant is sent in the two resource areas.

The method according to claim 1 or 2, wherein the first resource region is completely coincident or partially coincident or completely independent of a resource region for transmitting a downlink resource scheduling signaling DL Grant.

The method according to claim 3, wherein the method further comprises: the base station transmitting the location information of the first resource region and the location information of the second resource region to the RN, to indicate that the RN is in the first resource region and The UL Grant is detected in the second resource area.

A method for detecting a control signaling on a backhaul link, the method comprising: the relay node RN detecting a UL Grant in the first search space and the second search space respectively; the first search space is located In the first time slot of the downlink subframe, the second search space is located in the second time slot of the downlink subframe.

The method according to claim 5, wherein the first search space and the second search space are located in a frequency domain on a resource block RB used by a physical downlink control channel R-PDCCH on a base station transmission backhaul link. on.

The method according to claim 5 or 6, wherein the search space of the first search space and the downlink resource scheduling signaling DL Grant is completely coincident or partially coincident or completely independent.

The method according to claim 7, wherein the method further comprises: when the first search space completely coincides with the search space of the DL Grant, the RN detects the DL grant in the first search space.

A base station, the base station comprising:

An area determining unit, configured to determine to send an uplink resource scheduling signaling UL Grant in a pre-configured first resource area or a second resource area; the first resource area is located in a first time slot of a downlink subframe, The second resource region is located in the second time slot of the downlink subframe;

And a signaling sending unit, configured to send, in the first resource area or the second resource area, a UL Grant to the relay node RN according to the determination result of the area determining unit.

The base station according to claim 9, wherein the area determining unit is configured to: determine whether the first time slot is capable of carrying all or part of the UL to be currently transmitted.

The available resources of the Grant, if yes, determine to send the UL Grant in the pre-configured first resource area, otherwise, send the UL Grant in the pre-configured second resource area.

The base station according to claim 9 or 10, wherein the first resource region is completely coincident or partially coincident or completely independent of a resource region for transmitting a downlink resource scheduling signaling DL Grant.

The base station according to claim 11, wherein the base station further comprises:

a first configuration unit, configured to send location information of the first resource region and location information of the second resource region to the RN, to instruct the RN to detect the UL Grant in the first resource region and the second resource region

13. A relay node, wherein the relay node comprises:

The relay node according to claim 13, wherein the first search space and the second search space are located in a frequency domain on a physical downlink control channel on a base station transmission backhaul link. The resource block RB used by the R-PDCCH.

The relay node according to claim 13 or 14, wherein the search space of the first search space and the downlink resource scheduling signaling DL Grant is completely coincident or partially coincident or completely independent.

The relay node according to claim 15, wherein the first signaling detection unit is further configured to:

17. A wireless communication system, the system comprising:

The relay node is configured to detect the UL Grant in the first search space formed by the first resource area and the second search space formed by the second resource area, respectively.

18. The system of claim 17, wherein the base station is configured to:

The system according to claim 17 or 18, wherein the first resource region is completely coincident or partially coincident or completely independent of a resource region for transmitting a DL Grant.

The system according to claim 19, wherein the base station is further configured to: send location information of the first resource region and location information of the second resource region to the relay node;

The relay node is further configured to:

Determining a search space of the UL Grant according to the location information of the first resource region and the location information of the second resource region.

The system according to claim 19, wherein the relay node is further configured to: when the first resource region completely overlaps with a resource region for transmitting a DL Grant, in the first search The DL grant is detected in space.