Sidelink Receiver Window Adjustment for Propagation Delay
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Solution Overview
Problem
In wireless communication systems, particularly in sidelink communications, decoding wireless signals with different characteristics such as varying numerology, subcarrier spacing, cyclic prefix length, and frequency bands poses challenges due to propagation delays and mismatched receiver windows, leading to difficulties in normal decoding and increased interference.
Innovation Solution
A method for a user equipment (UE) to receive and decode multiple wireless signals by synchronizing on a sidelink, setting the start time of the receiver window based on one signal with a longer cyclic prefix, and adjusting the receiver window for signals with shorter cyclic prefixes to account for propagation delays, ensuring proper decoding across different frequency bands and numerologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single receiver window is used for decoding wireless signals with different cyclic prefix lengths, then device complexity is reduced, but decoding reliability deteriorates when propagation delay exceeds CP length
Solution Approach 1:
The patent applies dynamics by making the receiver window start time adjustable rather than fixed. The receiving UE dynamically determines the start time of the receiver window based on propagation delay measurements from reference signals, allowing the system to adapt to varying transmission distances while maintaining a single receiver window structure.
Solution Approach 2:
The patent changes the parameter of receiver window start time based on propagation delay conditions. By calculating propagation delay using reference signal received power and path loss, the system adjusts the receiver window timing parameter to ensure proper signal capture regardless of distance, resolving the contradiction between simple structure and reliable decoding.
2Ease of operation
If the receiver window start time is fixed according to related art, then ease of operation is improved, but decoding reliability deteriorates when propagation delay is large
Solution Approach 1:
The receiving UE performs self-service by autonomously measuring propagation delay using reference signals and automatically adjusting its receiver window start time accordingly. This eliminates the need for complex network coordination while improving decoding reliability in varying propagation conditions.
3Device complexity
If signals with different numerology and cyclic prefix lengths are decoded using the same receiver window, then device complexity is reduced, but measurement precision deteriorates due to timing mismatch
Solution Approach 1:
The patent applies local quality by allowing different receiver window configurations for different signal types. The receiving UE determines appropriate receiver window parameters based on the specific numerology and cyclic prefix length of each signal being decoded, enabling precise timing synchronization for each signal while maintaining a unified processing framework.
Data Source
AI summary
Presented in the present specification is a method for a receiving terminal supporting a sidelink. The receiving terminal according to the present specification acquires a synchronization for setting a symbol boundary, applies the same symbol boundary for a plurality of receiving signals, and can set a receiving window on the basis of the symbol boundary. The receiving terminal can acquire a propagation delay applied to a plurality of wireless signals through a first wireless signal among the plurality of wireless signals, and can adjust a starting time of the receiving window for decoding a second wireless signal through the propagation delay or can feed back information related to a transmission timing to a transmission device for transmitting the second wireless signal. Therefore, an efficient decoding technique for a second wireless signal having a characteristic newer than that of a conventional technique is presented.