Unified BSR Timer Control for Carrier Aggregation Conflicts
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Solution Overview
Problem
In Carrier Aggregation (CA) systems, existing methods fail to effectively control Buffer Status Report (BSR) timers, leading to conflicts and uncertainties in triggering BSR reports due to inconsistencies in timer management across component carriers in LTE-A systems.
Innovation Solution
A method and apparatus for controlling retransmission BSR timers and periodic BSR timers in a User Equipment (UE) by starting and restarting them based on specific conditions, such as new data transmission resources and types of BSRs transmitted over component carriers, ensuring timely and accurate BSR reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If BSR timers are maintained separately for each component carrier in carrier aggregation, then each carrier can independently manage its BSR reporting, but timer conflicts and uncertainties arise when timers expire at different times across carriers
Solution Approach 1:
The patent merges the BSR timer management from multiple component carriers into a single unified timer mechanism. Instead of maintaining separate retxBSR-Timer and periodicBSR-Timer for each carrier, the invention uses one common timer that is started when any carrier triggers a BSR and restarted based on the earliest expiration time among all carriers, ensuring synchronized and consistent BSR reporting across the aggregated carriers.
2Adaptability or versatility
If separate BSR timers are used for each component carrier, then carrier-specific BSR requirements can be met, but system complexity increases due to multiple timer states and restart conditions
Solution Approach 1:
The patent creates a universal BSR timer mechanism that serves all component carriers simultaneously. The single retxBSR-Timer and periodicBSR-Timer are designed to handle BSR reporting for multiple carriers through unified restart conditions, eliminating the need for separate timer instances while maintaining the ability to meet carrier-specific BSR requirements through the base station's scheduling decisions.
3Productivity
If BSR timers are restarted on each carrier independently, then each carrier can trigger BSR reports based on its own data status, but conflicting restart conditions create uncertainty in BSR reporting timing
Solution Approach 1:
The patent applies preliminary action by establishing unified timer restart conditions before timer expiration conflicts can occur. The base station determines the restart conditions for the unified BSR timers based on the data status of all component carriers in advance, ensuring that BSR reports are triggered at appropriate times without timing uncertainties caused by independent carrier-level timer management.
Data Source
AI summary
A method for controlling a timer on buffer status report (BSR) is provided in the present invention, and the method is applied to implement the control of the timer on BSR the system to which Carrier Aggregation technology is applied. Said method includes: starting a retransmission BSR timer (retxBSR-Timer) and a BSR periodic reporting timer (periodicBSR-Timer) when a sub frame has a component carrier which has a BSR to be transmitted; restarting the retxBSR-Timer when a sub frame has a component carrier which has new data transmission resources; and restarting the periodicBSR-Timer when a sub frame has a component carrier which has a long BSR or a short BSR to be transmitted. A device for implementing said method is also provided in the present invention.