Secondary Cell Scheduling Request Management for PUCCH Load Distribution
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Solution Overview
Problem
Current wireless communication systems using multiple cells face limitations in flexibility and efficiency, particularly in managing the Physical Uplink Control Channel (PUCCH) resources, which can lead to increased load on the primary cell and impact overall communication performance.
Innovation Solution
The method involves a user equipment (UE) and an evolved Node B (eNB) that utilize RRC messages to manage scheduling requests on both primary and secondary cells, setting parameters for the maximum number of scheduling requests and activating/deactivating secondary cells to optimize PUCCH resource usage, allowing transmissions on either or both cells based on configured parameters and timers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scheduling requests are transmitted only on the primary cell, then the primary cell can maintain simple PUCCH resource management, but the primary cell becomes overloaded and communication efficiency decreases
Solution Approach 1:
The patent segments the PUCCH resource management by introducing a secondary cell that can independently handle scheduling requests. The secondary cell is divided into a separate PUCCH group, allowing scheduling requests to be segmented between primary and secondary cells based on configuration parameters, thereby distributing the load and improving overall communication efficiency without overwhelming the primary cell.
2Quantity of substance
If multiple cells are used for communication, then communication capacity increases, but flexibility and efficiency in PUCCH resource management are limited
Solution Approach 1:
The patent introduces dynamic adaptability in PUCCH resource management by configuring parameters such as dsr-TransMax-SCell, sr-ProhibitTimer, and sr-SchedulingRequestIndicator that allow the system to dynamically adjust scheduling request behavior on secondary cells. This enables flexible adaptation to different communication scenarios while maintaining high communication capacity across multiple cells.
3Productivity
If scheduling request parameters are configured for secondary cells, then PUCCH resource distribution improves, but system complexity increases
Solution Approach 1:
The patent manages complexity by introducing specific configurable parameters (dsr-TransMax-SCell, sr-ProhibitTimer, sr-SchedulingRequestIndicator) that control secondary cell scheduling behavior. These parameters allow fine-tuned control over PUCCH resource distribution while maintaining manageable system complexity through standardized configuration mechanisms defined in the 3GPP protocol stack.
Data Source
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AI summary
A method by a user equipment (UE) is described. The method includes receiving, an evolved Node B (eNB) a RRC message including a parameter related to a SR periodicity for a secondary cell and a parameter related to a SR prohibit timer; and setting the SR prohibit timer based on the SR periodicity for the secondary cell. Setting the SR prohibit timer may be further based on the SR periodicity for the primary cell