Method of allocating resource for relay
A method for wireless backhaul communication between a base station and a relay is disclosed. The base station enables a physical control channel to be set up, separately from the terminal that is used to transmit control information to each relay and the physical downlink control channel that has been set up. The base station can transmit data to the relay based on this control information. In a special embodiment, physical downlink control channel transmissions can be minimized by prescribing in advance the transmission of control information between the base station and the relay.
1. A method for transmitting a signal to a relay at a Base Station (BS), the method comprising:
transmitting, by the BS to the relay in a primary backhaul region for the relay in a subframe, a second Physical Downlink Control Channel (R-PDCCH) carrying second control information for the relay; and
according to the second control information, transmitting, by the BS to the relay in the subframe, a data channel carrying data for the relay,
wherein the R-PDCCH is transmitted using a specific frequency band in the primary backhaul region of the subframe other than a first resource area of the subframe that is used for transmission of a first Physical Downlink Control Channel (PDCCH) carrying first control information for a User Equipment (UE), and
wherein the data channel corresponding to the R-PDCCH is transmitted only within a same frequency band in the subframe as the specific frequency band occupied by the R-PDCCH in the subframe, and
wherein the R-PDCCH further carries information on a secondary backhaul region allocated additionally for the relay in the subframe when the primary backhaul region is insufficient for signal transmission to the relay.
2. The method according to claim 1 , further comprising:
transmitting, to the relay, resource information indicating the primary backhaul region used for the relay,
wherein the primary backhaul region is configured with a plurality of resource blocks, and the resource information includes information indicating a starting resource block of the primary backhaul region and a number of the plurality of resource blocks in the primary backhaul region.
3. The method according to claim 1 , further comprising:
transmitting information indicating a symbol allocated to the primary backhaul region to the relay.
4. The method according to claim 1 , wherein the subframe in which the R-PDCCH is transmitted is a multicast/broadcast single-frequency network (MBSFN) subframe.
5. The method according to claim 1 , wherein the information on the secondary backhaul region includes at least presence of the secondary backhaul region, a position of the secondary backhaul region in the subframe or a modulation and coding scheme (MCS) level for the secondary backhaul region.
6. A method for receiving a signal from a Base Station (BS) at a relay, the method comprising:
receiving, from the BS by the relay in a primary backhaul region for the relay in a subframe, a second Physical Downlink Control Channel (R-PDCCH) carrying second control information for the relay; and
according to the second control information, receiving, from the BS by the relay in the subframe, a data channel carrying data for the relay,
wherein the R-PDCCH is received using a specific frequency band in the primary backhaul region of the subframe other than a first resource area of the subframe that is used for receiving a first Physical Downlink Control Channel (PDCCH) carrying first control information for a User Equipment (UE),
wherein the data channel corresponding to the R-PDCCH is transmitted only within a same frequency band in the subframe as the specific frequency band occupied by the R-PDCCH in the subframe, and
wherein the R-PDCCH further carries information on a secondary backhaul region allocated additionally for the relay in the subframe when the primary backhaul region is insufficient for signal transmission to the relay.
7. The method according to claim 6 , further comprising:
receiving, from the BS, resource information indicating the primary backhaul region allocated for the relay,
wherein the primary backhaul region is configured with a plurality of resource blocks and the resource information includes information indicating a starting resource block of the primary backhaul region and a number of the plurality of resource blocks in the primary backhaul region.
8. The method according to claim 6 , further comprising:
receiving information indicating a symbol used for the primary backhaul region from the BS.
9. The method according to claim 6 , wherein the subframe in which the R-PDCCH is received is a multicast/broadcast single-frequency network (MBSFN) subframe.
10. The method according to claim 6 , wherein the information on the secondary backhaul region includes at least presence of the secondary backhaul region, a position of the secondary backhaul region in the subframe or a modulation and coding scheme (MCS) level for the secondary backhaul region.
11. A Base station (BS) configured to transmit a signal to a relay, the BS comprising:
a transmitter configured to transmit a radio signal; and
a processor configured to control operations of the transmitter to:
transmit, to the relay in a primary backhaul region for the relay in a subframe, a second Physical Downlink Control Channel (R-PDCCH) carrying second control information for the relay; and
according to the second control information, transmit, to the relay in the subframe, a data channel carrying data for the relay,
wherein the R-PDCCH is transmitted using a specific frequency band in the primary backhaul region of the subframe other than a first resource area of the subframe that is used for transmission of a first Physical Downlink Control Channel (PDCCH) carrying first control information for a User Equipment (UE),
wherein the data channel corresponding to the R-PDCCH is transmitted only within a same frequency band in the subframe as the specific frequency band occupied by the R-PDCCH in the subframe,
wherein the data R-PDCCH further carries information on a secondary backhaul region allocated additionally for the relay in the subframe when the primary backhaul region is insufficient for signal transmission to the relay.
12. The BS according to claim 11 , wherein the processor is further configured to
control the transmitter to transmit, to the relay, resource information indicating the primary backhaul region allocated for the relay, and
configure the primary backhaul region with a plurality of resource blocks, wherein the resource information which includes information indicating a starting resource block of the primary backhaul region and a number of the plurality of resource blocks in the primary backhaul region.
13. The BS according to claim 11 , wherein the processor is further configured to control the transmitter to transmit information indicating a symbol used for the primary backhaul region to the relay.
14. The BS according to claim 11 , wherein the subframe in which the R-PDCCH is transmitted is a multicast/broadcast single-frequency network (MBSFN) subframe.
15. The BS according to claim 11 , wherein the information on the secondary backhaul region includes at least presence of the secondary backhaul region, a position of the secondary backhaul region in the subframe or a modulation and coding scheme (MCS) level for the secondary backhaul region.
16. A relay configured to receive a signal from a Base Station (BS), the relay comprising:
a receiver configured to receive a radio signal; and
a processor configured to control operations of the receiver to:
receive, from the BS in a primary backhaul region for the relay in a subframe, a second Physical Downlink Control Channel (R-PDCCH) carrying second control information for the relay; and
according to the second control information, receive, from the BS in the subframe, a data channel carrying data for the relay,
wherein the R-PDCCH is received using a specific frequency band in the primary backhaul region of the subframe other than a first resource area of the subframe that is used for receiving a first Physical Downlink Control Channel (PDCCH) carrying first control information for a User Equipment (UE),
wherein the data channel corresponding to the R-PDCCH is transmitted only within a same frequency band in the subframe as the specific frequency band occupied by the R-PDCCH in the subframe,
wherein the R-PDCCH further carries information on a secondary backhaul region allocated additionally for the relay in the subframe when the primary backhaul region is insufficient for signal transmission to the relay.
17. The relay according to claim 16 ,
wherein the processor is further configured to control the receiver to receive, from the BS, resource information indicating the primary backhaul region allocated for the relay, and
wherein the second resources block is configured with a plurality of resource blocks and the resource information includes information indicating a starting resource block of the primary backhaul region and a number of the plurality of resource blocks in the primary backhaul region.
18. The relay according to claim 16 , wherein the processor is further configured to control the receiver to receive information indicating a symbol used for the primary backhaul region from the BS.
19. The relay according to claim 16 , wherein the subframe in which the R-PDCCH is received is a multicast/broadcast single-frequency network (MBSFN) subframe.
20. The relay according to claim 16 , wherein the information on the secondary backhaul region includes at least presence of the secondary backhaul region, a position of the secondary backhaul region in the subframe or a modulation and coding scheme (MCS) level for the secondary backhaul region.