D2D Relay Buffer Status Feedback for Sidelink Resource Control
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Solution Overview
Problem
Existing technologies do not consider the amount of pending uplink data in a relay UE when determining radio resources for sidelink transmission from a remote UE to the relay UE, leading to inconsistencies in performance and potential buffer overflow or resource wastage due to mismatched bandwidth and throughput between sidelink and uplink transmissions.
Innovation Solution
An apparatus and method that adjust the bandwidth, throughput, or radio resources used for device-to-device (D2D) transmission from a remote terminal to a relay terminal based on the amount of pending uplink data in the relay terminal, by acquiring and utilizing buffer status information to optimize resource allocation and prevent buffer overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radio resources for sidelink transmission are determined without considering the amount of pending uplink data in the relay terminal, then the sidelink transmission can proceed with maximum bandwidth and throughput, but this causes buffer overflow or performance inconsistency in the relay terminal's uplink transmission
Solution Approach 1:
The relay terminal feeds back buffer status information to the remote terminal, enabling the remote terminal to adjust sidelink transmission resources based on the relay terminal's uplink buffer status. This feedback mechanism ensures that sidelink transmission throughput is optimized while preventing relay terminal buffer overflow, thus maintaining uplink transmission reliability.
Solution Approach 2:
The sidelink transmission resources (bandwidth, throughput, radio resources) are dynamically adjusted based on the relay terminal's buffer status. Instead of using fixed maximum resources, the system adapts resource allocation in real-time according to the relay terminal's uplink data accumulation state, resolving the contradiction between maximizing sidelink productivity and ensuring uplink reliability.
2Productivity
If excessive radio resources are allocated to sidelink transmission from remote terminal to relay terminal, then sidelink throughput is maximized, but this causes waste of radio resources when the relay terminal cannot transmit uplink data efficiently
Solution Approach 1:
The relay terminal provides feedback on its buffer status to the remote terminal, enabling informed resource allocation decisions. This feedback allows the system to avoid allocating excessive sidelink resources when the relay terminal's uplink transmission capacity is limited, thereby preventing radio resource wastage while maintaining efficient sidelink productivity.
Solution Approach 2:
The system changes the parameters of sidelink transmission (bandwidth, throughput, radio resources) based on the relay terminal's buffer status. By adjusting these parameters dynamically, the system optimizes sidelink productivity while avoiding resource wastage that would occur with fixed high-resource allocation.
3Ease of operation
If the relay terminal's buffer status is not considered in resource allocation, then the system operation is simple and fast, but this leads to inconsistency between sidelink and uplink transmission performance
Solution Approach 1:
The system introduces feedback of buffer status information from the relay terminal to the remote terminal. This feedback mechanism maintains relative operational simplicity while ensuring performance consistency between sidelink and uplink transmissions by enabling coordinated resource allocation based on actual buffer conditions.
Data Source
AI summary
An apparatus (1 or 3) adjusts a bandwidth, throughput, or radio resource used for device-to-device (D2D) transmission from a remote terminal (1) to a relay terminal (2), based on an amount of pending uplink data in the relay terminal (2) to be transmitted from the relay terminal (2) to a base station (3). In this way, for example, it is possible to contribute to avoiding inconsistency of performance between sidelink transmission from the remote terminal to the relay terminal and uplink transmission from the relay terminal to the base station.