Sidelink Bandwidth Part Switching via Uplink Mapping
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Solution Overview
Problem
Current communication systems, particularly in the new radio (NR) system, face challenges in efficiently supporting sidelink communication operations based on multiple bandwidth parts (BWPs), as existing methods lack effective mechanisms for managing the switching, activation, and deactivation of sidelink BWPs without separate signaling, which hinders seamless sidelink communication.
Innovation Solution
The proposed solution involves configuring a mapping relationship between uplink (UL) and sidelink (SL) BWPs, allowing for automatic switching, activation, and deactivation operations based on UL BWP operations, with configuration information transmitted from the base station to terminals, enabling simultaneous UL and SL communication without separate signaling for SL BWP operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate signaling is used for SL BWP switching operations, then the reliability of SL communication is improved, but the device complexity and signaling overhead increase
Solution Approach 1:
The patent merges SL BWP switching operations with UL BWP switching operations by establishing a mapping relationship between UL BWPs and SL BWPs. When UL BWP switching is triggered, the corresponding SL BWP switching is automatically performed based on the pre-configured mapping, eliminating the need for separate SL switching signaling while ensuring reliable SL communication through the coordinated switching mechanism.
Solution Approach 2:
The UL BWP switching mechanism is extended to serve dual purposes: controlling both UL communication and SL communication. The same switching trigger and control logic are used for both uplink and sidelink bandwidth part transitions, reducing overall system complexity while maintaining reliable operation of both communication types.
2Adaptability or versatility
If multiple SL BWPs are configured for different services, then the adaptability of SL communication is improved, but the device complexity increases
Solution Approach 1:
The patent segments SL BWP configuration by associating different SL BWPs with different UL BWPs, where each UL BWP-SL BWP pair can be optimized for specific service requirements (e.g., eMBB, URLLC, mMTC). This segmentation allows multiple service-specific SL BWPs to be configured while managing complexity through the structured mapping relationship with UL BWPs.
Solution Approach 2:
The mapping relationship between UL BWPs and SL BWPs is pre-configured before actual communication operations. This preliminary configuration establishes the association rules in advance, allowing the system to adapt to different service requirements without complex real-time decision-making, thereby improving adaptability while controlling configuration complexity.
3Productivity
If SL resource is configured immediately after UL switching, then the productivity of SL communication is improved, but the reliability of UL transmission is compromised
Solution Approach 1:
The patent introduces a pre-configured time offset between UL switching completion and SL resource configuration. This preliminary timing arrangement ensures that UL transmission is fully established and reliable before SL resources are activated in the switched BWP, preventing interference while maintaining efficient SL communication throughput.
Solution Approach 2:
The system dynamically adjusts the timing of SL resource configuration based on the completion of UL switching operations. By introducing a configurable time offset that adapts to the specific switching scenario, the system balances the competing requirements of UL transmission reliability and SL communication productivity in different operational contexts.
Data Source
AI summary
Disclosed are methods and apparatuses for supporting BWP-based operations in sidelink communication. An operation method of a first terminal in a communication system may include receiving, from a base station, configuration information of a mapping relationship between an uplink (UL) bandwidth part (BWP) and a sidelink (SL) BWP; when a UL switching operation for the UL BWP is performed, performing an SL switching operation for the SL BWP mapped to the UL BWP based on the mapping relationship without separate signaling indicating execution of the SL switching operation; and performing sidelink communication with a second terminal in a switched SL BWP.