Repeater for receiving signals from a base station in a wireless communication system, and signal receiving method
Disclosed are a repeater for receiving signals from a base station in a wireless communication system, and a signal receiving method. The base station reports, to each repeater, information on the aggregation level of a relay-control channel element (R-CCE) of a relay-physical downlink control channel (R-PDCCH) via an explicit signaling method or implicit signaling method. In the event the base station reports via an explicit signaling method, the repeater receives, from the base station, information on the aggregation level of R-CCE which is a transmission unit of R-PDCCH, wherein the information contains control information for the repeater. Then, the repeater decodes an R-PDCCH region on an R-CCE aggregation level basis in accordance with the received R-CCE aggregation level information.
1. A method for receiving a signal at a relay node (RN) in a wireless communication system, the method comprising:
receiving first information related to a pattern of subframes for an eNode B to the RN transmission and second information related to a set of resources blocks on which a relay-physical downlink control channel (R-PDCCH) is able to be mapped;
receiving a subframe capable of carrying the R-PDCCH according to the pattern of subframes;
searching a RN-specific search space of the received subframe to detect the R-PDCCH based on a relay-control channel element (R-CCE) aggregation level; and
detecting the R-PDCCH from the received subframe,
wherein a location of the RN-specific search space within the received subframe is derived from the second information related to the set of resource blocks, and
wherein the R-PDCCH is detected from a first slot of the received subframe if the R-PDCCH corresponds to a downlink assignment for the RN, and the R-PDCCH is detected from a second slot of the received subframe if the R-PDCCH corresponds to a uplink grant for the RN.
2. The method of claim 1 , further comprising:
decoding the detected R-PDCCH in units of the R-CCE aggregation level based on an identifier of the RN; and
receiving a signal from the eNode B through a Relay-Physical Downlink Shared Channel (R-PDSCH) corresponding to the R-PDCCH based on control information of the decoded R-PDCCH.
3. The method of claim 1 , wherein the R-CCE aggregation level is any one of 1, 2, 4, and 8.
4. The method of claim 1 , wherein the R-CCE aggregation level is applied to each of specific control information.
5. The method of claim 1 , wherein the R-CCE aggregation level is transmitted through a specific field of an R-Downlink Control Information (R-DCI) format.
6. The method of claim 5 , wherein the specific field of the R-DCI format consists of 2 bits.
7. A relay node (RN) apparatus for receiving signals in a wireless communication system, the relay node apparatus comprising:
a receiver configured to receive first information related to a pattern of subframes for an eNode B to the RN transmission and second information related to a set of resources blocks on which a relay-physical downlink control channel (R-PDCCH) is able to be mapped and to receive a subframe capable of carrying the R-PDCCH according to the pattern of subframes; and
a processor configured to control the receiver and to search a RN-specific search space of the received subframe to detect the R-PDCCH based on a relay-control channel element (R-CCE) aggregation level,
wherein a location of the RN-specific search space within the received subframe is derived from the second information related to the set of resource blocks, and
wherein the R-PDCCH is detected from a first slot of the received subframe if the R-PDCCH corresponds to a downlink assignment for the RN, and the R-PDCCH is detected from a second slot of the received subframe if the R-PDCCH corresponds to a uplink grant for the RN.
8. The relay node of claim 7 , wherein the processor controls the receiver to receive a signal from the eNode B through a Relay-Physical Downlink Shared Channel (R-PDSCH) corresponding to the R-PDCCH based on control information of the R-PDCCH.
9. The relay node of claim 7 , wherein the R-CCE aggregation level is any one of 1, 2, 4, and 8.
10. The relay node of claim 7 , wherein the R-CCE aggregation level is applied to each of specific control information.
11. The relay node of claim 7 , wherein the R-CCE aggregation level is transmitted through a specific field of an R-Downlink Control Information (R-DCI) format.
12. The relay node of claim 11 , wherein the specific field of the R-DCI format consists of 2 bits.
13. The method of claim 1 , further comprising:
receiving third information for determining a position of a starting symbol of a physical downlink shared channel (PDSCH) for the RN.
14. The method of claim 13 , wherein the position of the starting symbol of the PDSCH for the RN varies in a symbol domain according to the third information and the third information is explicitly signaled from the eNode B, and
a position of a starting symbol of the R-PDCCH is implicitly prescribed.
15. The method of claim 1 , wherein a position of a starting symbol of the R-PDCCH within in the first slot of the subframe is fixed in a symbol domain.
16. The method of claim 1 , wherein symbol indexes of the R-PDCCH within the first slot of the subframe are fixed as ‘3’ to ‘6’.
17. The method of claim 1 , wherein a length of the R-PDCCH within the first slot of the subframe corresponding to 4 symbols.
18. The method of claim 1 , wherein the subframe is configured as a multicast-broadcast single-frequency network (MBSFN) subframe.
19. The method of claim 1 , wherein the received subframe contains a PDCCH for at least one user equipment (UE) and a physical downlink shared channel (PDSCH) for the RN, and
the PDCCH for the UE is mapped on a control region of the subframe, and both of the R-PDCCH and the PDSCH for the RN are mapped on a data region of the subframe.