Timing control for integrated access and backhaul (IAB) node transmission
A method, system and apparatus are disclosed. In one or more embodiments, a network node configured to communicate with a wireless device (WD) is provided. The network node configured to, and/or including a radio interface and/or including processing circuitry configured to: receive information indicating a timing offset (T′ Δ ), determine transmission timing for downlink transmission based on the timing offset (T′ Δ ) and at least one estimated timing value, and perform downlink transmission based on the determine transmission timing.
1. An integrated access backhaul, IAB, network node comprising processing circuitry configured to:
receive information indicating a timing offset, T Δ ;
determine transmission timing for downlink transmission based at least in part on a reception timing estimate of downlink transmission from a parent network node, T P,DL,RX , the timing offset, T Δ , and an estimate of a timing difference, T A , between downlink transmissions received by the IAB network node and uplink transmission transmitted by the IAB network node, the determined transmission timing for downlink transmission is equal to:
T P,DL,RX −( T A −T Δ )/2; and
perform downlink transmission using the determined transmission timing.
2. The IAB network node of claim 1 , wherein the processing circuitry is configured to determine the transmission timing for the downlink transmission further based on an estimate of a reception timing of a downlink backhaul link from a parent IAB network node.
3. The IAB network node of claim 1 , wherein the processing circuitry is configured to receive the information indicating the timing offset via Radio Resource Control, RRC, signaling.
4. The IAB network node of claim 1 , wherein the processing circuitry is configured to receive the information indicating the timing offset via Medium Access Control, MAC, signaling.
5. The IAB network node of claim 1 , wherein the processing circuitry is configured to receive the information indicating the timing offset via one of:
broadcast signaling; and
network node specific signaling.
6. The IAB network node of claim 1 , wherein the timing offset, T Δ , is based at least in part on an offset, at the parent network node, between a downlink transmission to the IAB network node and uplink reception from the IAB network node.
7. The IAB network node of claim 6 , wherein the processing circuitry is configured to receive the information indicating the timing offset provided from a parent IAB network node.
8. A method implemented by an integrated access backhaul (IAB) network node, the method comprising:
receiving information indicating a timing offset, T Δ ;
determining transmission timing for downlink transmission based at least in part on a reception timing estimate of downlink transmission from a parent network node, T P,DL,RX , the timing offset, T Δ , and an estimate of a timing difference, T A , between downlink transmissions received by the IAB network node and uplink transmission transmitted by the IAB network node, the determined transmission timing for downlink transmission is equal to:
T P,DL,RX −( T A −T Δ )/2; and
performing downlink transmission using the determined transmission timing.
9. The method of claim 8 , wherein the method comprises determining the transmission timing for the downlink transmission further based on an estimate of a reception timing of a downlink backhaul link from a parent IAB network node.
10. The method of claim 8 , further comprising receiving the information indicating the timing offset via Radio Resource Control, RRC, signaling.
11. The method of claim 8 , further comprising receiving the information indicating the timing offset via Medium Access Control, MAC, signaling.
12. The method of claim 8 , further comprising receiving the information indicating the timing offset via one of:
broadcast signaling; and
network node specific signaling.
13. The method of claim 8 , wherein the timing offset, T Δ , is based at least in part on an offset, at the parent IAB network node, between a downlink transmission to the IAB network node and uplink reception from the IAB network node.
14. The method of claim 13 , further comprising receiving the information indicating the timing offset provided from a parent IAB network node.
15. A non-transitory computer readable medium including instructions which, when executed by a processor of an integrated access backhaul, IAB, network node, cause the processor to:
receive information indicating a timing offset, T Δ ;
determine transmission timing for downlink transmission based at least in part on a reception timing estimate of downlink transmission from a parent network node, T P,DL,RX , the timing offset, T Δ , and an estimate of a timing difference, T A , between downlink transmissions received by the IAB network node and uplink transmission transmitted by the IAB network node, the determined transmission timing for downlink transmission is equal to:
T P,DL,RX −( T A −T Δ )/2; and
perform downlink transmission using the determined transmission timing.
16. The non-transitory computer readable medium of claim 15 , wherein the information indicating the timing offset is received via one of Radio Resource Control, RRC, signaling and Medium Access Control, MAC, signaling.
17. A communication network comprising a parent integrated access backhaul, IAB, node and an integrated access backhaul, IAB, network node;
the parent IAB node comprising first processing circuitry configured to:
determine a timing offset value, T Δ ; and
communicate information indicating the timing offset value to the IAB network node;
the IAB network node comprising second processing circuitry configured to:
receive information indicating the timing offset, T Δ ;
determine transmission timing for downlink transmission based at least in part on a reception timing estimate of downlink transmission from a parent network node, T P,DL,RX , the timing offset, T Δ , and an estimate of a timing difference, T A , between downlink transmissions received by the IAB network node and uplink transmission transmitted by the IAB network node, the determined transmission timing for downlink transmission is equal to:
T P,DL,RX −( T A −T Δ )/2; and
perform downlink transmission using the determined transmission timing.