DL BACKHAUL CONTROL CHANNEL DESIGN FOR RELAYS
Methods and apparatus are described for providing compatible mapping for backhaul control channels, frequency first mapping of control channel elements (CCEs) to avoid relay-physical control format indicator channel (R-PCFICH) and a tree based relay resource allocation to minimize the resource allocation map bits. Methods and apparatus (e.g., relay node (RN)/evolved Node-B (eNB)) for mapping of the Un downlink (DL) control signals, Un DL positive acknowledgement (ACK)/negative acknowledgement (NACK), and/or relay-physical downlink control channel (R-PDCCH) (or similar) in the eNB to RN (Un interface) DL direction are described. This includes time/frequency mapping of above-mentioned control signals into resource blocks (RBs) of multimedia broadcast multicast services (MBMS) single frequency network (MBSFN)-reserved sub-frames in the RN cell and encoding procedures for these. Also described are methods and apparatus for optimizing signaling overheads by avoiding R-PCFICH and minimizing bits needs for resource allocation.
1 - 20 . (canceled)
21 . A base station comprising:
a processor configured to at least:
send a resource assignment associated with an uplink transmission;
receive the uplink transmission based on the resource assignment; and
send a physical downlink control channel (PDCCH) transmission in response to the uplink transmission, wherein the PDCCH transmission is sent using a radio network temporary identifier (RNTI), wherein the PDCCH transmission comprises downlink control information (DCI), and wherein at least the RNTI used to send the PDCCH transmission and a format of the DCI indicates feedback information associated with the uplink transmission.
22 . The base station of claim 21 , wherein the processor is configured to send the resource assignment via an uplink grant.
23 . The base station of claim 21 , wherein the resource assignment is associated with physical uplink shared channel (PUSCH) resources on which the uplink transmission is received by the base station.
24 . The base station of claim 23 , wherein the PUSCH resources are assigned dynamically or semi-statically.
25 . The base station of claim 21 , wherein the RNTI associated with the PDCCH transmission is a special RNTI.
26 . The base station of claim 21 , wherein the feedback information comprises an acknowledgement (ACK) or a negative acknowledgement (NACK).
27 . A method implemented by a base station, the method comprising:
sending a resource assignment associated with an uplink transmission;
receiving the uplink transmission based on the resource assignment; and
sending a physical downlink control channel (PDCCH) transmission in response to the uplink transmission, wherein the PDCCH transmission is sent using a radio network temporary identifier (RNTI), wherein the PDCCH transmission comprises downlink control information (DCI), and wherein at least the RNTI used to send the PDCCH transmission and a format of the DCI indicates feedback information associated with the uplink transmission.
28 . The method of claim 27 , comprising sending the resource assignment via an uplink grant.
29 . The method of claim 27 , wherein the resource assignment is associated with physical uplink shared channel (PUSCH) resources on which the uplink transmission is received by the base station.
30 . The method of claim 29 , wherein the PUSCH resources are assigned dynamically or semi-statically.
31 . The method of claim 27 , wherein the RNTI associated with the PDCCH transmission is a special RNTI.
32 . The method of claim 27 , wherein the feedback information comprises an acknowledgement (ACK) or a negative acknowledgement (NACK).
33 . A wireless transmit/receive unit (WTRU) comprising:
a processor configured to at least:
send an uplink transmission based on a resource assignment received from a network;
receive a physical downlink control channel (PDCCH) transmission;
determine that a radio network temporary identifier (RNTI) is associated with the PDCCH transmission;
determine, based on at least the RNTI being associated with the PDCCH transmission, that a downlink control information (DCI) format associated with the PDCCH transmission provides feedback information for the uplink transmission; and
determine the feedback information.
34 . The WTRU of claim 33 , wherein the processor is configured to receive the resource assignment via an uplink grant.
35 . The WTRU of claim 33 , wherein the resource assignment is associated with physical uplink shared channel (PUSCH) resources used for sending the uplink transmission.
36 . The WTRU of claim 35 , wherein the PUSCH resources used for sending the uplink transmission are assigned dynamically or semi-statically.
37 . The WTRU of claim 33 , wherein the RNTI is a special RNTI, wherein at least the RNTI indicates that the DCI format carries the feedback information associated with the uplink transmission.
38 . The WTRU of claim 37 , wherein the PDCCH transmission is scrambled with the special RNTI.
39 . The WTRU of claim 33 , wherein the feedback information comprises an acknowledgement (ACK) or a negative acknowledgement (NACK).