Sidelink Control Overhead Reduction via Dynamic Reservation
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Solution Overview
Problem
In sidelink wireless communication networks, there is a significant inefficiency in control overhead due to underutilization of control resources when only a few UE pairs are actively transmitting, as existing systems require frequent contention procedures, leading to unused or inefficiently used communication resources.
Innovation Solution
The proposed solution involves allowing a sidelink pair that has won contention to continue data transmission into the next control region, with higher priority pairs transmitting data during the control symbols and lower priority pairs refraining from transmission upon receiving a suppression signal indicating ongoing data transmission from the primary pair, thereby optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent contention procedures are required in sidelink communications, then channel access control is maintained, but control overhead increases and resource utilization decreases
Solution Approach 1:
The patent applies preliminary action by implementing a reservation mechanism where UEs perform channel sensing and send reservation signals before actual data transmission. This allows the channel to be reserved in advance, eliminating the need for frequent contention procedures during data transmission and improving resource utilization while maintaining access control.
Solution Approach 2:
The patent implements dynamics by introducing different operational modes (contention-based and reservation-based) that can be dynamically selected based on channel conditions and traffic patterns. The system transitions from static frequent contention to dynamic reservation, adapting the access mechanism to current needs and reducing control overhead.
2Ease of operation
If control regions are dedicated for contention and control message exchange, then channel access management is enabled, but data transmission efficiency decreases when control resources are underutilized
Solution Approach 1:
The patent applies universality by enabling control regions to serve multiple functions: they can be used for contention-based access when needed, for reservation signal exchange, and potentially for data transmission when control resources are underutilized. This multi-functionality allows the same time-frequency resources to adapt to different operational requirements, improving overall efficiency.
Solution Approach 2:
The patent implements partial action by allowing data transmission to partially overlap with control regions when control resources are not fully utilized. Instead of completely separating data and control transmissions, the system permits data to use portions of control regions opportunistically, increasing data transmission efficiency without completely sacrificing control functionality.
3Device complexity
If UEs contend for access to shared spectrum without central coordination, then network complexity is reduced, but control overhead increases due to frequent contention
Solution Approach 1:
The patent applies preliminary action by having UEs perform channel sensing and send reservation signals before data transmission. This preliminary channel access procedure establishes control parameters in advance, reducing the need for ongoing control signaling and minimizing control overhead during actual data transmission while maintaining distributed operation.
Solution Approach 2:
The patent implements continuity by establishing long-term reservations that allow data transmission to continue without repeated contention procedures. Once a UE successfully reserves the channel, it can transmit data continuously over the reserved period without needing to repeatedly perform contention, reducing control overhead and energy consumption while maintaining distributed network operation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Multiple user equipments (UEs) may communicate as part of a sidelink communications system. The UEs may identify a frame for a sidelink connection. The frame may include a control portion and a data portion. One UE of a pair of UEs may receive a data signal from the other UE of the pair, and the data signal may be received in the data portion of the first instance of the frame and in the control portion of a second instance of the frame. Another pair of UEs may attempt to reserve a subsequent data portion by transmitting a request signal in the control portion in the second instance of the frame, and the second pair of UEs may receive a suppression signal from the first pair of UEs indicating ongoing data transmission by the first pair of UEs.