IAB Backhaul Mapping for Reliable MBS Multi-Hop Delivery
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting multicast/broadcast services (MBS) in integrated access and backhaul (IAB) networks, particularly due to limited coverage and high-frequency signal attenuation, necessitating efficient multi-hop backhauling and reliable transmission.
Innovation Solution
A base station (BS) with a centralized unit (CU) and distributed unit (DU) is configured to transmit and receive MBS-associated traffic via a BH link, utilizing BH mapping information, including non-user plane traffic types, IP header information, and quality-of-service (QoS) parameters, to facilitate MBS traffic delivery over multi-hop links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multi-hop backhauling is used to extend coverage in high-frequency systems, then coverage area is improved, but signal attenuation and transmission reliability deteriorate
Solution Approach 1:
The backhaul path is segmented into multiple hops with intermediate IAB nodes, where each node performs signal amplification and relay transmission. This segmentation allows coverage extension while maintaining signal quality through coordinated multi-point transmission, resolving the contradiction between extended coverage and signal attenuation.
Solution Approach 2:
IAB nodes serve as intermediary relay points between the donor node and remote UEs. These intermediaries receive signals from upstream nodes and re-transmit them to downstream nodes, effectively bridging the signal attenuation problem across multi-hop paths while enabling widespread coverage.
2Area of stationary object
If MBS traffic is transmitted over IAB backhaul links, then service coverage is extended, but QoS degradation occurs due to shared medium constraints
Solution Approach 1:
Different backhaul links are configured with link-specific QoS parameters including priority levels, resource allocation ratios, and timing advance values. This local quality differentiation ensures that MBS traffic receives appropriate QoS treatment on each link segment, preventing QoS degradation while extending service coverage.
Solution Approach 2:
The system dynamically adjusts QoS parameters and resource allocation based on current network conditions and traffic requirements. This dynamic adaptation allows the network to maintain QoS reliability for MBS services while accommodating varying coverage requirements across different IAB nodes.
3Measurement precision
If BH mapping information is transmitted for MBS traffic, then traffic routing accuracy is improved, but control plane overhead increases
Solution Approach 1:
BH mapping information is pre-configured and established before MBS traffic begins transmission. This preliminary setup includes pre-establishing routing paths, QoS parameters, and resource allocations, which eliminates the need for continuous control plane signaling during data transmission, thereby reducing control overhead while maintaining routing accuracy.
Solution Approach 2:
IAB nodes autonomously use the received BH mapping information to forward MBS traffic without requiring continuous control plane intervention. The nodes self-manage the routing decisions and QoS enforcement based on the pre-provided mapping, reducing control plane overhead while maintaining accurate traffic routing.
Data Source
AI summary
Embodiments of the present disclosure relate to method and apparatus for supporting MBS in an IAB network. According to some embodiments of the disclosure, a BS may; transmit, from a CU of the BS to a network node or a DU of the BS, BH mapping information of MBS associated traffic, wherein the network node connects to the CU via the DU; and transmit MBS associated traffic to the network node or receive MBS associated traffic from the network node, via the DU and a BH link between the DU and the network node, based on the BH mapping information.