Sidelink Feedback Frame Structure for Reliable UE Communication
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Solution Overview
Problem
Current wireless communication systems lack an efficient and reliable mechanism for feedback transmission over sidelink interfaces, particularly in scenarios where user devices communicate directly with each other outside of base station coverage.
Innovation Solution
The implementation of a feedback mechanism that allows user devices to transmit feedback indicating successful data reception and sidelink channel conditions, using a modified sidelink frame structure that includes control signaling for indicating feedback requirements and allowing for reduced frame duration for data transmission and feedback reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback transmission mechanism is implemented over sidelink interface, then data transmission reliability is improved, but device complexity increases
Solution Approach 1:
The sidelink frame is segmented into distinct parts: a first part containing control signaling for feedback indication, and a second part containing data transmission. This segmentation allows the feedback mechanism to be integrated into the existing frame structure without requiring complete redesign, thus improving reliability while limiting complexity increase.
Solution Approach 2:
The sidelink frame structure is designed to serve multiple functions: it carries both control signaling for feedback indication and actual data transmission. The feedback mechanism reuses existing frame structures and resources, making the system more versatile without proportionally increasing complexity.
2Reliability
If feedback transmission is enabled in sidelink frames, then communication reliability is improved, but frame duration increases
Solution Approach 1:
The frame is divided such that control signaling for feedback indication occupies only the first part, while data transmission occurs in the second part. This segmentation allows feedback mechanisms to be activated selectively without extending the entire frame duration, maintaining timing efficiency while improving reliability.
Solution Approach 2:
The feedback indication is transmitted partially within the existing frame structure using control signaling in the first part, rather than requiring a complete separate feedback frame. This partial action approach provides reliability improvement without the full overhead of dedicated feedback transmission.
3Reliability
If control signaling is added to indicate feedback requirements, then feedback reliability is improved, but signaling overhead increases
Solution Approach 1:
The control signaling in the first part of the sidelink frame serves multiple purposes: it coordinates feedback transmission and carries other control information. This multi-functionality reduces the need for separate dedicated feedback signaling, thereby improving feedback reliability without proportionally increasing overhead.
Solution Approach 2:
The feedback indication is merged with the existing control signaling structure in the first part of the frame, rather than being transmitted as a separate entity. This merging approach integrates feedback coordination into the existing control plane, improving reliability while minimizing additional overhead.
Data Source
AI summary
A wireless communication system apparatus is connected to a user device, UE, via a sidelink for a sidelink communication with the UE. For unicast transmission to the UE, the apparatus transmits a sidelink frame having a certain frame duration, a first part of the sidelink frame including a control signaling indicating to the UE whether feedback is to be returned to the apparatus, the feedback indicating a successful reception of data at the UE and/or a sidelink channel condition. When feedback from the UE is desired, the apparatus transmits in the first part of the frame, using the control signaling, the indication that the feedback is to be provided by the UE such that a duration of the control signaling is shorter, by a remaining duration, than the frame duration, and receive from the UE, during the remaining duration, the feedback.