# US 12,004,070 B2 · DL backhaul control channel design for relays > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,070 B2 - Document ID: US12004070B2 - Status: Granted - Kind: B2 - Application number: 17/885,629 - Filed: 2022-08-11 - Published: 2022-12-01 - Granted: 2024-06-04 - Earliest claimed: 2009-08-14 - Assignees: InterDigital Technology Corporation - Applicants: Interdigital Technology Corporation - Inventors: Kalpendu R. Pasad; Sung-Hyuk Shin; Mihaela C. Beluri; Marian Rudolf; Pascal M. Adjakple; John W. Haim - Web page: https://patentgrep.com/patent/US12004070B2 ## CPC - H04W 40/22: using selective relaying for reaching a BTS [Base Transceiver Station] or an access point - H04B 7/155: Ground-based stations (H04B7/204 takes precedence) - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 88/04: adapted for relaying to or from another terminal or user - H04W 72/04: Wireless resource allocation - H04W 72/20: Control channels or signalling for resource management - H04W 84/047: {using dedicated repeater stations} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The WTRU of claim 1, wherein the processor is configured to receive the resource assignment via an uplink grant. ### Claim 3 (depends on 1) The WTRU of claim 1, wherein the resource assignment is associated with physical uplink shared channel (PUSCH) resources used for sending the uplink transmission. ### Claim 4 (depends on 3) The WTRU of claim 3, wherein the PUSCH resources used for sending the uplink transmission are assigned dynamically or semi-statically. ### Claim 5 (depends on 1) 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. ### Claim 6 (depends on 5) The WTRU of claim 5, wherein the PDCCH transmission is scrambled with the special RNTI. ### Claim 7 (depends on 1) The WTRU of claim 1, wherein the feedback information comprises an acknowledgement (ACK) or a negative acknowledgement (NACK). ### Claim 8 (depends on 1) The WTRU of claim 1, wherein the feedback information for the uplink transmission is carried by the PDCCH transmission. ### Claim 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. ### Claim 10 (depends on 9) The method of claim 9, comprising receiving the resource assignment via an uplink grant. ### Claim 11 (depends on 9) The method of claim 9, wherein the resource assignment is associated with physical uplink shared channel (PUSCH) resources used for sending the uplink transmission. ### Claim 12 (depends on 11) The method of claim 11, wherein the PUSCH resources used for sending the uplink transmission are assigned dynamically or semi-statically. ### Claim 13 (depends on 9) 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. ### Claim 14 (depends on 13) The method of claim 13, wherein the PDCCH transmission is scrambled with the special RNTI. ### Claim 15 (depends on 9) The method of claim 9, wherein the feedback information comprises an acknowledgement (ACK) or a negative acknowledgement (NACK). ### Claim 16 (depends on 9) The method of claim 9, wherein the feedback information for the uplink transmission is carried by the PDCCH transmission.