Wireless Relay Link Recovery in Multi-Hop Backhaul Failures
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Solution Overview
Problem
Existing wireless relay apparatuses face challenges in efficiently re-establishing backhaul and access links after a radio link failure, particularly when the failure occurs in a multi-hop relay network, leading to disruptions in data transmission and reception.
Innovation Solution
The wireless relay apparatus employs a communication control method that utilizes a first message from the BAP layer to re-establish a backhaul link and a second message from a different layer to manage access links, enabling swift recovery even when radio conditions are favorable for maintaining connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single unified process is used to re-establish both backhaul link and access link, then the control logic is simplified, but the recovery time increases and network stability deteriorates
Solution Approach 1:
The patent divides the link recovery process into two separate processes: a first process for re-establishing the backhaul link using BAP layer messages, and a second process for re-establishing or releasing the access link using messages from other layers. This segmentation allows each process to be optimized independently, reducing overall recovery time while maintaining manageable control logic complexity.
2Device complexity
If the wireless relay apparatus waits for backhaul link recovery before managing access link, then protocol simplicity is maintained, but communication disruption increases
Solution Approach 1:
The patent enables the second process for access link management to be executed independently and concurrently with the backhaul link recovery process. This preliminary action on the access link allows user equipment communication to be maintained or quickly restored without waiting for backhaul link recovery, improving communication continuity while maintaining protocol structure simplicity.
3Manufacturing precision
If different layer messages are used for backhaul and access link management, then link recovery precision is improved, but device complexity increases
Solution Approach 1:
The patent applies different layer messages tailored to specific link requirements: BAP layer messages for backhaul link management and other layer messages for access link management. This local quality approach optimizes each message type for its specific function, achieving precise link recovery while managing device complexity through specialized rather than generalized message handling.
Data Source
AI summary
A communication control method using a wireless relay apparatus connected to an upper apparatus via a backhaul link includes, in a case that a backhaul link of the wireless relay apparatus fails to be recovered, by the wireless relay apparatus, executing a first process for re-establishing a backhaul link of a lower wireless relay apparatus connected to the wireless relay apparatus by using a first message of a BAP layer of the wireless relay apparatus; and executing a second process for re-establishing or releasing an access link of a user equipment connected to the wireless relay apparatus by using a second message of a layer different from the BAP layer.