Sidelink Carrier Aggregation RLF Timer Control Between UEs
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing inter-user equipment (UE) coordination in sidelink carrier aggregation (SL CA), particularly in detecting and handling radio link failures (RLF) across multiple carriers, which can disrupt communication quality and efficiency.
Innovation Solution
A UE is equipped with a transceiver and processor to receive configuration information about multiple SL carriers, detect SL RLF, and initiate a timer-based activation or deactivation of carriers, with a base station (BS) generating configuration information and determining SL carrier status through a timer-based mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SL RLF detection is implemented for multiple SL carriers, then communication reliability is improved, but device complexity increases due to the need for timer management and carrier status monitoring across multiple carriers
Solution Approach 1:
The patent applies segmentation by dividing the SL CA system into independent carrier units, each with its own RLF detection and timer management. This allows the system to handle multiple carriers separately, improving reliability through individual monitoring while managing complexity through modular processing of each carrier's status independently
Solution Approach 2:
The patent implements dynamic carrier management where carriers can be dynamically activated or deactivated based on their RLF status and timer expiration. This dynamic approach allows the system to adapt to changing channel conditions, maintaining high reliability by activating only healthy carriers while keeping the overall system flexible and manageable
2Productivity
If timer-based carrier activation/deactivation is implemented, then resource allocation efficiency is improved, but loss of time increases due to timer waiting periods before carrier status changes
Solution Approach 1:
The patent applies preliminary action by implementing timer mechanisms that anticipate potential RLF conditions and proactively manage carrier status transitions. The timers are configured to trigger carrier deactivation before complete link failure occurs, preventing wasted resource allocation on failed carriers and improving overall resource efficiency while managing time loss through predictable timing
Solution Approach 2:
The patent utilizes parameter changes by adjusting timer values and carrier status based on detected RLF conditions. When RLF is detected, the system changes the carrier status parameter from active to deactivated, and when RLF is recovered, it changes back to active. This parameter-based control enables efficient resource allocation while the timer mechanism manages the time aspect of status transitions
Data Source
AI summary
Methods and apparatuses for inter-user equipment (UE) coordination in sidelink (SL) carrier aggregation (CA) in a wireless communication system. A method of operating a UE includes: receiving, from a base station (BS), configuration information about multiple SL carriers for a SL CA operation; determining whether a SL radio link failure (RLF) is detected for a SL carrier among the multiple SL carriers; and starting a timer for the SL carrier based on a determination that the SL RLF is detected, wherein an activation or a deactivation of the SL carrier is determined based on a status of the timer.