Sidelink BWP Switching Synchronization via Feedback
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Solution Overview
Problem
Current sidelink communication systems in wireless networks face challenges in efficiently managing bandwidth parts (BWP) for seamless device-to-device communication, leading to potential mismatches and disruptions in wireless communication flows.
Innovation Solution
A method and apparatus at user equipment (UE) are implemented to manage BWP switching requests and confirmations between UEs, including transmitting and receiving BWP switching messages to ensure synchronized BWP transitions and revert to original BWP upon mismatches or timer expiration, thereby maintaining communication stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If BWP switching is implemented in sidelink communication, then communication flexibility and adaptability are improved, but BWP mismatch and communication disruptions occur
Solution Approach 1:
The patent implements a feedback mechanism where UEs exchange BWP switching status information through uplink and downlink feedback messages. The network device receives feedback about whether the UE has successfully switched BWPs and sends subsequent control messages accordingly, ensuring both UEs are synchronized and preventing communication mismatches.
Solution Approach 2:
The network device coordinates BWP switching by first sending a first BWP switching control message to the transmitting UE, waiting for feedback confirmation, and then sending a second BWP switching control message to the receiving UE. This preliminary coordination ensures the transmitting UE switches first, and the receiving UE switches afterward, preventing BWP mismatch before communication occurs.
2Measurement precision
If multiple BWP switching control messages are coordinated, then BWP synchronization between UEs is improved, but network device complexity increases
Solution Approach 1:
The patent segments the BWP switching control process into distinct stages: first controlling the transmitting UE's BWP switching, receiving feedback about the switch status, then controlling the receiving UE's BWP switching. This segmentation allows the network device to manage complexity by handling one UE at a time rather than coordinating all UEs simultaneously.
Solution Approach 2:
The network device acts as an intermediary that mediates the BWP switching between UEs. It sends control messages to UEs, collects feedback from UEs, and makes decisions about subsequent switching actions. This intermediary role simplifies the overall system by centralizing the coordination logic in the network device rather than requiring direct UE-to-UE coordination.
3Reliability
If BWP switching confirmation is implemented, then communication reliability is improved, but switching time delay increases
Solution Approach 1:
The patent implements periodic action by using timeout mechanisms and scheduled feedback requests. The network device sends feedback requests at specific intervals and uses timeout thresholds to determine when to proceed with subsequent switching actions. This periodic approach ensures reliability through confirmation while limiting time loss through predefined thresholds.
Data Source
AI summary
Methods, apparatuses, and computer-readable storage medium for SL communications are provided. An example method may include transmitting, to a second UE, a SL BWP switching request message requesting a switch from a first BWP to a second BWP. The example method may further include receiving, from the second UE, an SL BWP switching decision message confirming the switch from the first BWP to the second BWP. The example method may further include switching from the first BWP to the second BWP upon receiving the SL BWP switching decision message. The example method may further include transmitting, to the second UE, an SL BWP switching confirmation message confirming the switch from the first BWP to the second BWP. The example method may further include reverting back to the first BWP.