Handover Target Selection Without Wireless Relay Backhaul
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Solution Overview
Problem
In cellular wireless networks, handovers to relay base stations can result in increased latency and interruptions, especially during high-priority communications like VoLTE calls, due to the use of wireless relay backhaul connections, and may also lead to unnecessary resource consumption.
Innovation Solution
A method and system for selecting a handover target based on the absence of a wireless relay backhaul connection to avoid relay base stations and ensure seamless communication by triggering handovers to base stations without such connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If handover to relay base station is performed to extend coverage, then coverage area is improved, but latency increases and communication reliability deteriorates
Solution Approach 1:
The patent introduces a handover restriction mechanism that acts as an intermediary control layer between the relay base station and the UE. By configuring handover restriction information indicating whether handover is restricted to relay base stations, the system mediates the handover decision process to avoid direct handover to relay base stations for high-priority communications, thus reducing latency while maintaining the coverage extension capability of relay base stations for other scenarios.
2Area of stationary object
If handover to relay base station is performed to extend coverage, then coverage area is improved, but communication reliability deteriorates due to interruptions
Solution Approach 1:
The patent implements preliminary action by configuring handover restriction information before handover occurs. The source base station determines whether the target base station is a relay base station and proactively configures handover restriction information to restrict handover to relay base stations for UEs engaged in high-priority communications. This preliminary restriction prevents communication interruptions before they can occur, maintaining reliability while preserving coverage extension capabilities.
3Area of stationary object
If handover to relay base station is performed, then coverage extension is achieved, but network resource efficiency deteriorates due to unnecessary handovers
Solution Approach 1:
The patent implements feedback mechanisms where the source base station receives information about the target base station's relay status and UE communication priority, then uses this feedback to make intelligent handover decisions. The handover restriction information is configured based on feedback about whether the target is a relay base station and whether the UE is engaged in high-priority communications, preventing unnecessary handovers to relay base stations and optimizing network resource efficiency while maintaining coverage extension benefits.
Data Source
AI summary
Disclosed are methods and systems for selection of a handover target for a user equipment device (UE). In particular, a wireless communication system may serve the UE over an air interface connection between the UE and a source base station (BS). While the system serves the UE, the system may make a selection of a handover target for the UE. And in accordance with the disclosure, the selection may be based at least in part on the handover target not having a wireless relay backhaul connection. Once the system selects the handover target using the disclosed approach, the system may then trigger handover of the UE from being served by the source BS to being served by the selected handover target.