Prioritized MAC CE Handling in Wireless Uplink Scheduling
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP NR, there is a challenge in prioritizing the transmission of Media Access Control (MAC) Control Elements (CE) over data when a Scheduling Request (SR) collides with uplink Shared Channel (UL-SCH) transmission, leading to unclear handling of SR and UL-SCH prioritization.
Innovation Solution
A method where a wireless device determines prioritized MAC CEs and triggers SRs, prioritizing uplink transmissions of MAC PDUs over Physical Uplink Control Channel (PUCCH) transmissions of SRs, ensuring efficient priority handling between UL-SCH and SR Physical Uplink Control Channel (PUCCH) transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If SR transmission is prioritized over UL-SCH transmission, then scheduling request is transmitted timely, but prioritized MAC CE transmission may be dropped
Solution Approach 1:
The patent changes the priority parameter assignment by defining that MAC CEs with priority indicator equal to 0 have higher priority than SR transmissions. This parameter change in the priority handling mechanism resolves the contradiction by ensuring prioritized MAC CE transmissions are not dropped even when SR is triggered, while still allowing timely SR transmission when MAC CEs are not present.
2Reliability
If MAC CE transmission is prioritized over SR transmission, then prioritized data transmission is ensured, but SR transmission may be delayed or dropped
Solution Approach 1:
The patent introduces a priority indicator parameter for MAC CEs and establishes a clear priority relationship: MAC CEs with priority indicator 0 are transmitted before SR. This parameter-based priority system ensures that when both MAC CE and SR are ready for transmission, the MAC CE is transmitted first, preventing data loss while the SR can be transmitted in subsequent opportunities.
3Adaptability or versatility
If collision handling between SR and UL-SCH is not clearly defined, then system flexibility is maintained, but transmission priority becomes unclear leading to potential data loss
Solution Approach 1:
The patent defines clear priority handling rules based on the priority indicator parameter of MAC CEs. When a collision between SR and UL-SCH carrying MAC CE occurs, the system determines priority based on the MAC CE priority indicator value, ensuring reliable and clear priority determination while maintaining system adaptability through the configurable priority indicator mechanism.
Data Source
AI summary
A method and apparatus for priority handling between a prioritized MAC CE and a SR for data in a wireless communication system is provided. A wireless device determines a prioritized Media Access Control (MAC) Control Element (MAC CE) which is prioritized over a data in Logical Channel Prioritization. The wireless device triggers Scheduling Request (SR) for requesting resource for the data. Based on that Physical Uplink Control Channel (PUCCH) transmission of the triggered SR is overlapped with uplink transmission of a first MAC PDU including the prioritized MAC CE, the wireless device (1) prioritizes the uplink transmission of the first MAC PDU over the PUCCH transmission of the triggered SR transmission, and (2) performs the uplink transmission of the first MAC PDU.