Radio Resource Management for Mobility Reliability
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Solution Overview
Problem
In wireless communication systems, user devices may temporarily go out of coverage due to mobility or obstacles, leading to disruptions in sidelink communication, especially for vehicles, which can result in communication continuity issues and difficulties in resuming connections with base stations.
Innovation Solution
The system maintains or reserves allocated resources for a predefined time interval when a user device goes out of coverage, monitoring the radio link to determine short-term out-of-coverage situations and providing a timer to ensure resource availability, allowing for seamless handovers and continued communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system releases allocated resources immediately when a user device goes out of coverage, then resource utilization efficiency is improved, but communication continuity and reliability deteriorate
Solution Approach 1:
The system dynamically adjusts resource reservation duration based on the duration of out-of-coverage. A timer mechanism is introduced that allows resources to be reserved for a configurable time period after coverage loss, with the reservation automatically expiring if coverage is not restored within that period. This dynamic approach balances resource efficiency with communication reliability.
Solution Approach 2:
The patent introduces a timer parameter (e.g., T310 timer) that controls the resource reservation duration. By adjusting this parameter, the system can flexibly control how long resources remain reserved after coverage loss, allowing optimization between resource utilization and communication continuity based on specific network conditions and service requirements.
2Reliability
If the system monitors radio link continuously to detect out-of-coverage, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The user device autonomously monitors its own radio link quality and independently determines when it has lost coverage. The device self-manages the timer mechanism and resource reservation status without requiring complex network-side monitoring infrastructure. This self-service approach improves reliability through continuous monitoring while minimizing system complexity by distributing the monitoring function to individual devices.
3Reliability
If the system reserves resources for extended period after coverage loss, then communication continuity is improved, but resource utilization efficiency worsens
Solution Approach 1:
The system employs periodic timer-based resource reservation where resources are reserved for a specific time period after coverage loss. The timer periodically checks whether coverage has been restored, and if not, the resources are automatically released after the predetermined duration. This periodic mechanism ensures communication continuity during brief outages while preventing indefinite resource occupation that would reduce overall utilization efficiency.
Data Source
AI summary
A wireless communication system includes one or more base stations and one or more user devices, UEs, for a communication with a base station and/or another UE using allocated resources. In case the UE gets out of coverage of a serving base station, at least some of the allocated resources of the serving cell are maintained or reserved for a predefined time interval, T.