Information transceiving method, data transmission method and apparatuses thereof
An information transceiving apparatus, applicable to a first IAB-donor-node, includes a transmitter configured to transmit a first message to a second IAB-donor-node, the first message comprising a BAP address of a first node in topology of the first IAB-donor-node, and a receiver configured to receive a second message transmitted by the second IAB donor node, the second message comprising a BAP Routing ID in topology of the second IAB donor node, and a processor configured to configure BAP routing entries for nodes in its topology according to the second message.
1 . An information transceiving apparatus, applicable to a first IAB (Integrated Access and Backhaul)-donor-node, the apparatus comprises: a transmitter configured to transmit a first message to a second IAB-donor-node, the first message comprising a BAP (Backhaul Adaptation Protocol) address of a first node in topology of the first IAB-donor-node; and a receiver configured to receive a second message transmitted by the second IAB donor node, the second message comprising a BAP Backhaul Adaptation Protocol) Routing ID in topology of the second IAB donor node;
and a processor configured to configure BAP routing entries for nodes in its topology according to the second message.
2 . The apparatus according to claim 1 , wherein:
the first IAB donor node is an F1-terminating donor of a third IAB node, and the second IAB donor node is a non-F1-terminating donor of the third IAB node.
3 . The apparatus according to claim 2 , wherein:
the third IAB node is a boundary IAB node, and the third IAB node needs to establish inter-donor topology redundancy for traffic offload from the F1-terminating donor to the non-F1-terminating donor.
4 . The apparatus according to claim 1 , wherein the BAP routing entries comprise a BAP Routing ID, the BAP Routing ID comprising a BAP address of an IAB-donor-DU in the topology of the second IAB-donor-node.
5 . The apparatus according to claim 1 , wherein the first message and the second message are carried by XnAP signaling.
6 . The apparatus according to claim 2 , wherein the transmitter further transmits routing mapping relationship configuration information configured according to the second message to the third IAB-node, wherein
the routing mapping relationship configuration information indicating a correspondence between a first routing ID in the topology of the first IAB donor node taken as an ingress routing ID and a second routing ID in the topology of the second IAB-donor-node taken as an egress routing ID; or
the routing mapping relationship configuration information indicating a correspondence between a second routing ID in the topology of the second IAB-donor-node taken as an ingress routing ID and a first routing ID in the topology of the first IAB-donor-node taken as an egress routing ID.
7 . The apparatus according to claim 6 , wherein the routing mapping relationship configuration information is carried by F1AP signaling.
8 . The apparatus according to claim 7 , wherein the F1AP signaling comprises:
one or multiple information elements included in BAP MAPPING CONFIGURATION message to add and/or remove the routing mapping relationship configuration information.
9 . The apparatus according to claim 8 , wherein the one or multiple information elements comprise:
an Ingress BAP Routing ID representing the BAP Routing ID to be rewritten; and
an Egress BAP Routing ID representing the BAP Routing ID used to write in BAP header.
10 . The apparatus according to claim 2 , wherein the processer configures the BAP routing entries for descendant nodes of the third IAB node.
11 . The apparatus according to claim 2 , wherein the processor further configures a mapping information of an uplink traffic type to the BAP Routing ID on descendant nodes of the third IAB node.
12 . The apparatus according to claim 11 , wherein the BAP Routing ID includes a BAP address of an IAB-donor-DU in the topology of the second IAB donor node.
13 . An information transceiving apparatus, applicable to a second IAB (Integrated Access and Backhaul)-donor-node, the apparatus comprises: a receiver configured to receive a first message transmitted by the first IAB-donor-node, the first message comprising a BAP (Backhaul Adaptation Protocol) address of a first node in topology of the first IAB-donor-node; a transmitter configured to transmit a second message to a first IAB donor node, the second message comprising a BAP Routing ID in topology of the second IAB donor node; and a processor configured to configure BAP routing entries for nodes in its topology.
14 . The apparatus according to claim 13 , wherein the processor further configures a mapping of an IP header information to the BAP Routing ID for downlink traffic on an IAB-donor-DU in the topology of the second IAB donor node.
15 . The apparatus according to claim 14 , wherein the mapping is carried in IP-to-layer-2 traffic mapping Information List information element in a BAP MAPPING CONFIGURATION message via F1AP signaling.
16 . A data transmission apparatus, applicable to a third IAB (Integrated Access and Backhaul)-node, the apparatus comprises: a third receiver configured to receive a BAP (Backhaul Adaptation Protocol) Data PDU (Protocol Data Unit); rewriting processor circuitry configured to perform BAP Routing ID rewriting on a BAP header in the BAP Data PDU according to routing mapping relationship configuration information when a predetermined condition is satisfied, wherein the rewriting processor circuitry replaces a BAP Routing ID in the BAP header with an Egress BAP Routing ID in the routing mapping relationship configuration information; and forwarding processor circuitry configured to forward the rewritten BAP Data PDU.
17 . The apparatus according to claim 16 , wherein the predetermined condition is that a DESTINATION field in the BAP Data PDU is not a BAP address of the third IAB node, and the BAP Routing ID in the BAP header matches the Ingress BAP Routing ID in the routing mapping relationship configuration information.
18 . The apparatus according to claim 17 , wherein the BAP address of the third IAB node is allocated by the second IAB donor node via RRCReconfiguration message.
19 . The apparatus according to claim 16 , wherein when a DESTINATION field in the BAP Data PDU is the BAP address of the third IAB node, the third IAB node transmits a BAP SDU with a BAP header being removed to an upper layer.