Sidelink-Centric Subframe for Wireless Interference Management
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Solution Overview
Problem
Existing wireless communication systems face interference challenges in sidelink signaling, where UE-to-UE communications may interfere with base station-to-UE and other UE-to-UE communications, affecting communication efficiency and overall user experience.
Innovation Solution
The implementation of a sidelink-centric subframe structure that includes a control portion for grant information, primary and secondary request signals, and response signals to manage channel reservations and minimize interference, allowing for efficient sidelink data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink signaling is implemented for direct UE-to-UE communication, then communication efficiency between user equipment is improved, but interference with base station-to-UE communications and other UE-to-UE communications occurs
Solution Approach 1:
The subframe is segmented into distinct portions: a first portion for downlink control information and a second portion for sidelink communication. This segmentation allows simultaneous operation of base station control functions and direct UE-to-UE sidelink communication without mutual interference, thereby maintaining communication efficiency while eliminating harmful interference effects.
Solution Approach 2:
The base station acts as an intermediary by providing centralized scheduling and coordination of sidelink resources. The base station allocates specific time-frequency resources for sidelink communication and manages resource reservations, enabling efficient direct UE communication while preventing interference with cellular communications through centralized control.
2Reliability
If channel reservation is implemented for sidelink data transmission, then data transmission reliability is improved, but resource allocation complexity increases
Solution Approach 1:
Channel reservation is performed in advance through preliminary signaling exchanges between UEs. The resource reservation signal (RRS) is transmitted beforehand to reserve sidelink resources for future data transmissions, ensuring reliable communication while allowing the base station to pre-coordinate these reservations, thereby managing complexity through advance planning rather than real-time allocation.
Solution Approach 2:
The system implements feedback mechanisms where UEs exchange resource reservation signals and acknowledge received reservations. This feedback loop ensures that resource allocations are confirmed and coordinated, improving transmission reliability through verification while maintaining manageable complexity through standardized feedback protocols managed by the base station.
Data Source
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AI summary
An apparatus may receive, from a scheduling entity, sidelink grant information in a downlink control channel. After receiving the grant information in the downlink control channel, the apparatus may transmit a request-to-send (RTS) signal comprising an indication of a requested duration of time to reserve a sidelink channel for sidelink data. If the sidelink channel is available for the requested duration of time, the apparatus may receive a clear-to-send (CTS) signal configured to indicate an availability of the sidelink channel for the requested duration of time. Subsequently, the apparatus may communicate, with another apparatus different from the scheduling entity, the sidelink data using the sidelink channel during the requested duration of time. Afterwards, the apparatus may communicate acknowledgment information corresponding to the communication of the sidelink signal with the other apparatus. Various additional and alternative aspects are described herein.