Sidelink BWP Allocation Using Delay Spread for V2X
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Solution Overview
Problem
Wireless communication systems face performance degradation due to mutual interference and inter-carrier/inter-symbol interference, particularly in V2X communication scenarios where accurate signal allocation and timing are critical for reliable data transmission.
Innovation Solution
A method where user equipment (UE) in a wireless communication system allocates bandwidth parts (BWPs) based on delay spread values, using extended or normal cyclic prefixes, to minimize interference by configuring different resources in the time domain and incorporating a time gap between BWP allocations, ensuring efficient signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bandwidth parts (BWPs) are allocated without considering delay spread values, then resource allocation is simple, but mutual interference and inter-carrier/inter-symbol interference occur causing performance degradation
Solution Approach 1:
The patent applies parameter changes by allocating different BWP configurations based on delay spread values. Specifically, UEs with different delay spread characteristics are assigned different BWP parameters (such as cyclic prefix lengths and bandwidth configurations), which transforms a single uniform resource allocation approach into a multi-parameter differentiated allocation strategy, thereby reducing interference while maintaining manageable complexity
Solution Approach 2:
The patent implements local quality by tailoring BWP allocation to individual UE characteristics. Each UE receives a customized BWP configuration based on its specific delay spread value, rather than applying a uniform configuration to all UEs. This localized optimization ensures that each UE operates with parameters best suited to its channel conditions, improving overall communication reliability
2Reliability
If extended cyclic prefix is used for all bandwidth parts, then interference mitigation is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent changes the cyclic prefix parameter dynamically based on UE delay spread characteristics. Instead of uniformly applying extended cyclic prefix to all BWPs, the system selects between normal and extended cyclic prefix configurations according to specific delay spread thresholds, optimizing both interference mitigation and resource efficiency
Solution Approach 2:
The patent introduces dynamics by making cyclic prefix selection adaptive rather than static. The cyclic prefix length is determined dynamically based on real-time delay spread measurements, allowing the system to switch between normal and extended cyclic prefix modes as channel conditions change, thereby balancing interference protection with resource utilization
3Productivity
If time gap is not incorporated between BWP allocations, then resource allocation density increases, but inter-carrier/inter-symbol interference increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and incorporating appropriate time gaps between BWP allocations based on predicted or measured delay spread characteristics. This proactive timing adjustment prevents interference before it occurs, allowing denser resource allocation while maintaining signal quality
Solution Approach 2:
The patent implements preliminary anti-action by introducing time gaps as a preventive measure against potential inter-carrier/inter-symbol interference. The time gap acts as a protective buffer that counteracts the harmful effects of dense resource allocation, allowing the system to achieve high resource density without sacrificing signal integrity
Data Source
AI summary
An aspect of the present disclosure provides a method of a user device in a wireless communication system, the method comprising: receiving, on one bandwidth part (BWP) among multiple BWPs, multiple discovery signals; on the basis of a delay spread value of each of the multiple discovery signals, transmitting, on the one BWP, allocation information of BWPs remaining after excluding the one BWP among the multiple BWPs; and receiving, on the remaining BWPs, multiple sidelink control signals and data signals, wherein it is configured that only an extended CP is to be used on the one BWP, and only a normal CP is to be used on the remaining BWPs. The user device is an autonomous driving vehicle or is included in an autonomous driving vehicle.