Sidelink SR Priority Handling for SL-PRS Transmission Collisions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling collisions between Scheduling Request (SR) transmissions and Sidelink (SL) transmissions, particularly when triggered by Sidelink Positioning Reference Signal (SL-PRS) resource requests, leading to inefficiencies and potential interference.
Innovation Solution
A method where a User Equipment (UE) determines priority values for both SL and SR transmissions, selecting one based on these values to prioritize either SL or SR, ensuring concurrent transmissions are avoided when one has a lower priority, thereby reducing interference and optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits both SL and SR simultaneously, then the communication throughput is improved, but interference and collision between transmissions occur
Solution Approach 1:
The patent changes the parameter of transmission priority by determining a priority value for the SR transmission based on SL-PRS resource requests. The UE compares this SR priority with SL transmission priority and adjusts transmission behavior accordingly, allowing simultaneous transmission only when priority levels permit, thus improving throughput while controlling interference.
Solution Approach 2:
The patent implements dynamic priority assignment where the SR transmission priority is not fixed but determined based on the urgency and resource requirements of pending SL-PRS transmissions. This dynamic adjustment allows the system to adapt transmission behavior to current conditions, enabling simultaneous transmissions when appropriate and preventing them when interference would occur.
2Productivity
If the UE prioritizes SR transmission over SL transmission, then network scheduling efficiency is improved, but SL communication reliability deteriorates
Solution Approach 1:
The patent changes the priority parameter dynamically based on the type and urgency of transmissions. When SL-PRS resource requests are pending, the UE determines SR priority reflecting this urgency and compares it with SL transmission priority. This ensures that SL communications receive appropriate priority treatment while still allowing necessary SR transmissions to network nodes.
3Measurement precision
If the UE determines SR priority based on multiple SL-PRS priority values, then resource allocation accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by determining the priority value for SR transmission in advance, based on the priority values of pending SL-PRS transmissions indicated in the SL-PRS Resource Request MAC CE. This pre-determination of priority allows the UE to make informed transmission decisions without complex real-time calculations during the transmission moment, balancing accuracy with processing simplicity.
Data Source
AI summary
A method and apparatus are disclosed. In an example from the perspective of a first User Equipment (UE), the first UE determines a first priority value associated with a first Sidelink (SL) transmission to a second UE. The first UE determines a second priority value associated with a Scheduling Request (SR) transmission to a network node based upon one or more priority values associated with one or more second SL transmissions associated with a SL resource request based upon which the SR transmission is triggered. The first UE selects, from among a plurality of transmissions including the first SL transmission and the SR transmission, one of the first SL transmission or the SR transmission based upon the first priority value and the second priority value. The first UE performs the selected transmission.