Sidelink Resource Pool Scheduling to Avoid PSFCH Interference
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Solution Overview
Problem
The coexistence of LTE and NR sidelink communication technologies on the same carrier frequency leads to interference due to the presence of NR's physical sidelink feedback channel (PSFCH), which affects the reception performance of LTE devices by causing auto gain control (AGC) issues.
Innovation Solution
A sidelink communication method and apparatus that configures user equipment (UE) to avoid transmitting PSFCH when LTE and NR resource pools overlap, ensuring LTE SL and NR SL do not share the same time unit, thereby preventing communication interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NR sidelink resource pool supports PSFCH on the same carrier as LTE sidelink resource pool, then NR feedback communication capability is improved, but LTE reception performance deteriorates due to AGC interference
Solution Approach 1:
The patent segments the sidelink resource pools by time domain, dividing them into non-overlapping time units. LTE SL resource pool and NR SL resource pool are configured to operate in different time slots, preventing simultaneous transmission that causes AGC interference. This temporal segmentation allows both LTE and NR to coexist on the same carrier without mutual interference.
Solution Approach 2:
The patent introduces time domain dimension as an additional resource dimension for separating LTE and NR sidelink operations. Instead of only frequency division (different carriers), the solution adds time division multiplexing as another dimension, creating a two-dimensional resource allocation framework that prevents interference while maintaining both technologies' functionality.
2Productivity
If LTE and NR sidelink resource pools overlap in time domain on the same carrier, then resource utilization efficiency is improved, but communication interference increases due to PSFCH transmission
Solution Approach 1:
The patent segments overlapping time-frequency resources by introducing time domain separation. Configuration information explicitly indicates non-overlapping time units for LTE and NR SL resource pools, dividing the shared carrier into dedicated time slots for each technology. This segmentation maintains high resource utilization while eliminating interference by ensuring LTE and NR transmissions do not occur simultaneously.
3Reliability
If PSFCH is transmitted in NR sidelink, then NR hybrid automatic repeat request feedback is enabled, but LTE auto gain control stability is compromised
Solution Approach 1:
The patent extracts or removes PSFCH transmission from time units where LTE sidelink resources are active. By configuring NR SL resource pools to exclude time units occupied by LTE SL resources, the harmful PSFCH transmissions are taken out of the system during LTE operation periods, preventing AGC instability while preserving NR HARQ feedback capability in dedicated NR time slots.
Data Source
AI summary
A sidelink (SL) communication method, performed by user equipment (UE), including: obtaining configuration information, where the configuration information includes time frequency resource information of a first sidelink (SL) resource pool for a first radio access technology (RAT) and a second SL resource pool for a second RAT on a first carrier, the first SL resource pool does not support a physical sidelink feedback channel (PSFCH), the second SL resource pool supports the PSFCH, and the first SL resource pool and the second SL resource pool overlap in a time domain; and not transmitting, according to the configuration information, the PSFCH in a time unit where the first SL resource pool and the second SL resource pool overlap.