Scheduling Request Handling for Secondary Cells
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Solution Overview
Problem
In LTE wireless communication systems, existing mechanisms for scheduling request (SR) transmission are inadequate for secondary cells (SCells), leading to operational issues and inability to apply control mechanisms designed for primary cells (PCells) to SCells, resulting in irregular UE and eNB operation.
Innovation Solution
A communication device and method that configures distinct SR periods for primary and secondary cells, starts a prohibit timer based on the secondary cell's SR period, and manages SR transmissions and timer operations in response to radio resource control messages to prevent overloading and improve throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control mechanisms designed for PCell are applied to SCell, then mechanism consistency is improved, but operational regularity deteriorates
Solution Approach 1:
The patent applies different SR control mechanisms to different cell types: PCell uses the existing sr-ProhibitTimer mechanism while SCell uses a new sr-ProhibitTimer-SCell mechanism. This local differentiation ensures that each cell type operates with appropriate control parameters, preventing operational irregularities while maintaining overall system consistency.
2Adaptability or versatility
If SR transmission is released on SCell, then SR flexibility is improved, but cell overloading worsens
Solution Approach 1:
The patent implements a prohibit timer mechanism that prevents SR transmissions during specific time periods. By proactively blocking SR transmissions before overloading can occur, the system maintains flexibility in SR configuration while preventing harmful overloading effects on the SCell.
3Loss of time
If SR prohibit timer is stopped upon SCell SR release, then response time is improved, but timer management complexity worsens
Solution Approach 1:
The patent segments the SR prohibit timer into two distinct timers: sr-ProhibitTimer for PCell and sr-ProhibitTimer-SCell for SCell. This segmentation allows independent management of each timer, enabling the SCell timer to be stopped promptly upon SR release without affecting PCell timer operations, thus improving response time while maintaining manageable complexity through clear separation of concerns.
Data Source
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AI summary
A communication device for handling scheduling request (SR) transmissions comprises a storage unit for storing instructions and a processing circuit coupled to the storage unit. The processing circuit is configured to execute the instructions stored in the storage unit. The instructions comprise being configured to communicate with a first cell and a second cell; being configured a first SR period for a first SR transmission on the first cell and a second SR period for a second SR transmission on the second cell, wherein the second SR period is smaller than the first SR period; starting a SR prohibit timer according to the second SR period; receiving a radio resource control (RRC) message and releasing the second SR transmission in response to the RRC message; and keeping the SR prohibit timer running in response to the release of the second SR transmission.