Remote UE BWP Selection via Relay CBR Feedback
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Solution Overview
Problem
Establishing an efficient connection between a relay user equipment (UE) and a remote UE in multiple bandwidth parts (BWPs) while managing channel busy ratio (CBR) effectively is challenging in wireless communication systems, particularly in scenarios requiring power saving and optimal bandwidth selection.
Innovation Solution
A method involving the remote UE transmitting a PC5-S connection request message to a relay UE, receiving a response message with recommended BWPs, and selecting an optimal BWP for communication, which includes determining CBR and adjusting retransmission counts based on the channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple bandwidth parts (BWPs) are used for sidelink communication, then communication efficiency and adaptability are improved, but device complexity and difficulty of managing channel busy ratio increase
Solution Approach 1:
The patent divides the communication bandwidth into multiple Bandwidth Parts (BWPs), each with different characteristics. The relay UE and remote UE can select appropriate BWPs based on channel conditions, power constraints, and service requirements. This segmentation allows the system to handle different communication scenarios efficiently without managing the entire bandwidth as a single complex entity.
Solution Approach 2:
The patent implements dynamic BWP selection and switching mechanisms where the relay UE recommends BWPs to the remote UE based on real-time channel busy ratio measurements and power consumption considerations. The remote UE can switch between BWPs adaptively, enabling the system to respond dynamically to changing channel conditions and power constraints, thereby improving communication efficiency while maintaining manageable complexity through structured decision-making procedures.
2Use of energy by moving object
If optimal bandwidth part selection is implemented, then power consumption is reduced, but the complexity of determining channel busy ratio and selecting BWPs increases
Solution Approach 1:
The relay UE acts as an intermediary that performs channel busy ratio measurements and BWP selection on behalf of the remote UE. The relay UE measures CBR for different BWPs, determines power consumption characteristics, and recommends suitable BWPs to the remote UE through PC5-S signaling. This intermediary approach allows the remote UE to save power by avoiding complex measurements and decisions, while the relay UE handles the complexity of channel assessment and BWP selection.
Solution Approach 2:
The relay UE performs preliminary channel busy ratio measurements and power consumption assessments before the remote UE needs to transmit data. By pre-evaluating channel conditions and preparing BWP recommendations in advance, the system reduces the real-time decision-making complexity for the remote UE and enables faster, more efficient communication setup with minimized power consumption.
3Adaptability or versatility
If relay UE recommends multiple BWPs to remote UE, then adaptability and communication reliability are improved, but the complexity of message exchange and BWP selection increases
Solution Approach 1:
The patent implements a feedback mechanism where the relay UE measures channel busy ratios for multiple BWPs and provides recommended BWPs to the remote UE through PC5-S response messages. The remote UE can select from the recommended BWPs based on its specific requirements. This feedback loop enables the system to adapt to different channel conditions while maintaining manageable complexity through structured message exchange protocols that convey essential information efficiently.
Data Source
AI summary
One embodiment relates to an operating method of a remote UE in a wireless communication system, in which the remote UE transmits a PC5-S connection request message to a relay UE, the remote UE receives a PC5-S response message from the relay UE, and the remote UE transmits a PC5-S completion message to the relay UE, wherein the PC5-S connection request message is transmitted through a first BWP, the PC5-S response message is received through the first BWP, the PC5-S response message includes one or more BWPs recommended by the relay UE, and the PC5-S completion message is transmitted through a BWP selected by the remote UE from among the one or more BWPs.