IAB Backhaul Rerouting via Egress Link and RLC Channel Reselection
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Solution Overview
Problem
In wireless communication systems with integrated access and backhaul architecture, backhaul links between IAB nodes can fail, necessitating effective methods for rerouting uplink and downlink transmissions.
Innovation Solution
A method involving configuration information for reselecting egress links and RLC channels based on routing and bearer mapping configurations, along with the transmission of Buffer Status Reports or Pre-emptive BSRs, to reroute data through available paths in case of link failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multi-hop backhauling is used to extend coverage range, then coverage area is improved, but link failure probability increases
Solution Approach 1:
The system pre-configures multiple candidate routing paths and bearer mapping relationships before failures occur. When a link failure is detected, the IAB node can immediately switch to a pre-prepared alternative path without calculation delays, thus extending coverage while maintaining reliability.
Solution Approach 2:
The routing configuration is made dynamic through real-time monitoring of link status and automatic reselection of egress links based on current network conditions. This allows the system to adapt to changing environments, maintaining both extended coverage and high reliability.
2Reliability
If alternative routing paths are pre-configured for failure recovery, then reliability is improved, but device complexity increases
Solution Approach 1:
The routing configuration is segmented into multiple independent candidate paths with distinct routing identities. Each path is independently configured and can be independently selected, which simplifies the management of complexity while ensuring reliable failure recovery.
Solution Approach 2:
The BAP layer acts as an intermediary that manages the complexity of multiple routing paths by providing a standardized interface for path selection and switching. This abstraction layer handles the complexity internally while presenting a simple interface to upper layers.
3Reliability
If real-time link failure detection and re-routing is implemented, then reliability is improved, but processing time increases
Solution Approach 1:
Candidate routing paths and bearer mappings are prepared in advance before failures occur. When a failure is detected, the system immediately activates a pre-selected alternative path, minimizing processing time while ensuring reliable data transmission.
Solution Approach 2:
The system implements real-time feedback through link quality monitoring and failure detection mechanisms. This feedback triggers automatic re-routing decisions, enabling rapid response to failures while maintaining high transmission reliability.
Data Source
AI summary
The present disclosure relates to methods and apparatuses. According to some embodiments of the disclosure, a method includes: receiving configuration information at a communication device, wherein the configuration information indicates routing configuration and bearer mapping configuration; detecting a failure on a first egress link between the communication device and a first next hop communication device of the communication device; re-routing first data intended to be transmitted on the first egress link, wherein the first data has not been acknowledged by a layer lower than a BAP layer of the communication device; reselecting a second egress link between the communication device and a second next hop communication device based on the routing configuration; reselecting an egress RLC channel of the second egress link based on bearer mapping configuration; and submitting the first data to the reselected egress RLC channel of the second egress link.