Radio Bearer Compatibility Management in Wireless Handovers
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Solution Overview
Problem
In wireless communication systems, when a User Equipment (UE) establishes or re-establishes a radio connection with a second base station, conflicts can arise due to unsupported or unrecognized Signaling Radio Bearers (SRB) configurations, leading to communication failures.
Innovation Solution
The second base station manages radio bearer compatibility by causing the UE to release the SRB4 and establish a radio bearer of another type, or by reconfiguring the SRB4, using techniques such as omitting SRB4 configurations, including explicit indicators, or providing full configurations that omit SRB4 details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the second base station provides full configuration without checking SRB4 compatibility, then configuration speed is improved, but communication reliability deteriorates due to logical channel identity conflicts
Solution Approach 1:
The second base station performs preliminary checking of SRB4 configuration compatibility before providing full configuration to the UE. This preliminary action identifies potential logical channel identity conflicts in advance, allowing the system to maintain high configuration speed while preventing communication failures by avoiding incompatible configurations.
2Reliability
If the second base station checks SRB4 configuration compatibility, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism where the second base station checks SRB4 configuration compatibility through a structured process involving identification of the UE's SRB4 configuration, comparison with available logical channel identities, and determination of compatibility. This intermediary checking process maintains reliability while managing complexity through systematic evaluation rather than ad-hoc checks.
3Ease of operation
If the UE continues using SRB4 with the second base station, then ease of operation is improved, but communication failures occur due to unsupported SRB4 configuration
Solution Approach 1:
The second base station provides feedback to the UE regarding SRB4 configuration compatibility. This feedback mechanism informs the UE whether its current SRB4 configuration is supported, allowing the UE to adjust its operation accordingly. The feedback enables the UE to maintain simple operation by continuing to use SRB4 when compatible, while preventing communication failures by allowing the UE to modify or disable SRB4 when incompatible.
Data Source
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AI summary
A user device (UE) for managing radio bearers communicates, with a first base station over a first radio bearer associated with a dedicated control channel and configured to carry at least application-layer measurement reporting information, the radio bearer associated with a logical channel identity (2502); receives, from a radio access network (RAN) including the first base station and a second base station, a message related to (i) the first radio bearer or (ii) a second radio bearer having the logical channel identity and terminated at the second base station (2504); and release or reconfigure the first radio bearer in response to the message (2506).