SCell Deactivation Timer Management in Wireless Systems
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Solution Overview
Problem
In 3GPP LTE wireless communication systems, there is a need for efficient handling of the secondary cell (SCell) deactivation timer to prevent premature deactivation of SCells, especially when providing multimedia broadcast multicast services (MBMS) to ensure continuous service and resource efficiency.
Innovation Solution
A method for user equipment (UE) to start or restart the SCell deactivation timer, or delay its expiry, when receiving specific channels or services on a SCell, thereby avoiding premature deactivation and ensuring continuous operation of SCells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the SCell deactivation timer is used to manage secondary cells, then power consumption and resource usage are reduced when SCells are not needed, but the SCell may be deactivated prematurely during ongoing services such as MBMS transmission
Solution Approach 1:
The UE monitors whether it is receiving a specific channel or service on the SCell and provides feedback by restarting or delaying the deactivation timer based on this reception status, preventing premature deactivation during ongoing services
Solution Approach 2:
The deactivation timer behavior is made dynamic by allowing the UE to restart or delay the timer expiry based on real-time reception conditions, transitioning from a static timer mechanism to an adaptive one that responds to service requirements
2Productivity
If the SCell deactivation timer expires, then the SCell is deactivated to free up resources, but this causes service interruption for ongoing transmissions like MBMS
Solution Approach 1:
The UE performs preliminary action by detecting ongoing service reception before the timer expires and proactively restarting or delaying the deactivation timer to prevent service interruption
Solution Approach 2:
The UE applies preliminary anti-action by counteracting the deactivation process through timer restart or delay when service reception is detected, preventing the harmful effect of premature deactivation
Data Source
AI summary
A method and apparatus for handling a secondary cell (SCell) deactivation timer in a wireless communication system is provided. When a user equipment (UE) is receiving a specific channel or service on a SCell from a network, the UE may start or restart a SCell deactivation timer whenever the SCell deactivation timer expires. Alternatively, the UE may delay expiry of a SCell deactivation timer whenever the SCell deactivation timer expires.