Method and apparatus for transmitting data to a network node in a wireless communication system
A method of operating a first node in a wireless communication network is provided. The method comprises: receiving an ingress data packet; determining routing; and transmitting the ingress data packet. Determining routing may comprise determining a next hop node for the ingress data packet taking account of first level routing information indicating target next hop nodes. Alternatively, determining routing may comprise determining, for a target next hop node, a channel on which to transmit the ingress data packet taking account of second level routing information.
1. A method of operating a first node in a wireless communication network, the method comprising:
receiving a data packet;
receiving a routing information from an integrated access backhaul (IAB) donor node;
receiving a mapping information from the IAB donor node;
determining a next hop for the data packet, based on a backhaul adaptation protocol (BAP) address of the next hop comprised in the routing information;
determining an egress radio link control (RLC) channel for the data packet, based on the mapping information including the BAP address of the next hop, an identifier (ID) of an ingress RLC channel and an ID of an egress RLC channel; and
transmitting the data packet to the next hop.
2. The method of claim 1 , wherein the first node comprises an IAB node arranged to communicate backhaul traffic wirelessly with at least one of a parent node or a child node; and
wherein the data packet comprises an IAB data packet.
3. The method of claim 2 , wherein the IAB data packet is received from an uplink or downlink node.
4. The method of claim 1 , wherein for uplink communication, the routing information further comprises, for each target next hop for an uplink, a cell identifier or a cell group identifier of a cell supported by the target next hop to which the first node attaches.
5. The method of claim 1 , wherein for downlink communication the routing information comprises, for each target next hop for a downlink, at least one of:
a cell-radio network temporary identifier (C-RNTI) of the target next hop;
a C-RNTI of the target next hop combined with a cell identifier or a cell group identifier of a cell supported by the first node to which the target next hop attaches; or
a BAP address of the target next hop.
6. The method of claim 5 , wherein the BAP address of the target next hop comprises an IAB specific address.
7. The method of claim 5 , wherein the routing information is dynamically assigned according to whether the BAP address of the target next hop is shorter than the C-RNTI or the C-RNTI combined with the cell identifier or the cell group identifier.
8. The method according to claim 7 , further comprising deciding which identifier to use from among the C-RNTI or the C-RNTI combined with the cell identifier or the cell group identifier, based on signaling incurred by a required reconfiguration.
9. The method of claim 1 , wherein the mapping information comprises a unique identifier assigned to each RLC channel by the IAB donor node.
10. The method of claim 1 , wherein the determining of the next hop comprises determining the next hop based on at least one of:
current status of egress backhaul (BH) links; or
feedback received from child nodes on downstream congestion.
11. A first node in a wireless communication network, the first node comprising:
a transceiver; and
at least one processor operably coupled with the transceiver, the at least one processor configured to:
receive, by controlling the transceiver, a data packet;
receive, by controlling the transceiver, a routing information from an integrated access backhaul (IAB) donor node;
receive, by controlling the transceiver, a mapping information from the IAB donor node;
determine a next hop for the data packet, based on a BAP address of the next hop comprised in the routing information;
determine an egress RLC channel for the data packet, based on the mapping information including the BAP address of the next hop, an ID of an ingress RLC channel and an ID of an egress RLC channel; and
transmit, by controlling the transceiver, the data packet to the next hop.
12. The first node of claim 11 , wherein the first node is an IAB node arranged to communicate backhaul traffic wirelessly with at least one of a parent node or a child node; and
wherein the data packet comprises an IAB data packet.
13. The first node of claim 12 , wherein the IAB data packet is received from an uplink or downlink node.
14. The first node of claim 11 , wherein for uplink communication, the routing information further comprises, for each target next hop for an uplink, a cell identifier or a cell group identifier of a cell supported by the target next hop to which the first node attaches.
15. The first node of claim 11 , wherein for downlink communication the routing information comprises, for each target next hop for a downlink, at least one of:
a cell-radio network temporary identifier (C-RNTI) of the target next hop;
a C-RNTI of the target next hop combined with a cell identifier or a cell group identifier of a cell supported by the first node to which the target next hop attaches; or
a BAP address of the target next hop.
16. The first node of claim 15 , wherein the BAP address of the target next hop comprises an IAB specific address.
17. The first node of claim 15 , wherein the routing information is dynamically assigned according to whether the BAP address of the target next hop is shorter than the C-RNTI or the C-RNTI combined with the cell identifier or the cell group identifier.
18. The first node of claim 17 , wherein the at least one processor is further configured to decide which identifier to use from among the C-RNTI or the C-RNTI combined with the cell identifier or the cell group identifier, based on signaling incurred by a required reconfiguration.
19. The first node of claim 11 , wherein the mapping information comprises a unique identifier assigned to each RLC channel by the IAB donor node.
20. A non-transitory computer readable storage medium comprising instructions that, when executed by a processor of a first node, cause the first node to:
receive a data packet;
receive a routing information from an integrated access backhaul (IAB) donor node;
receive a mapping information from the IAB donor node;
determine a next hop for the data packet, based on a BAP address of the next hop comprised in the routing information;
determine an egress RLC channel for the data packet, based on the mapping information including the BAP address of the next hop, an identifier (ID) of an ingress RLC channel and an ID of an egress RLC channel; and
transmit the data packet to the next hop.