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. 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, in accordance with 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.
2. The WTRU of claim 1 , wherein the processor is configured to receive the resource assignment via an uplink grant.
3. The WTRU of claim 1 , wherein the resource assignment is associated with physical uplink shared channel (PUSCH) resources used for sending the uplink transmission.
4. The WTRU of claim 3 , wherein the PUSCH resources used for sending the uplink transmission are assigned dynamically or semi-statically.
5. The WTRU of claim 1 , wherein the RNTI is a special wherein at least the RNTI indicates that the DCI format carries the feedback information associated with the uplink transmission.
6. The WTRU of claim 5 , wherein the PDCCH transmission is scrambled with the special RNTI.
7. The WTRU of claim 1 , wherein the feedback information comprises an acknowledgement (ACK) or a negative acknowledgement (NACK).
8. The WTRU of claim 1 , wherein the feedback information for the uplink transmission is carried by the PDCCH transmission.
9. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
sending an uplink transmission based on a resource assignment received from a network;
receiving a physical downlink control channel (PDCCH) transmission;
determining that a radio network temporary identifier (RNTI) is associated with the PDCCH transmission;
determining, in accordance with 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
determining the feedback information.
10. The method of claim 9 , comprising receiving the resource assignment via an uplink grant.
11. The method of claim 9 , wherein the resource assignment is associated with physical uplink shared channel (PUSCH) resources used for sending the uplink transmission.
12. The method of claim 11 , wherein the PUSCH resources used for sending the uplink transmission are assigned dynamically or semi-statically.
13. The method of claim 9 , 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.
14. The method of claim 13 , wherein the PDCCH transmission is scrambled with the special RNTI.
15. The method of claim 9 , wherein the feedback information comprises an acknowledgement (ACK) or a negative acknowledgement (NACK).
16. The method of claim 9 , wherein the feedback information for the uplink transmission is carried by the PDCCH transmission.