Terminal Device D2D Cellular Transmission Scheduling
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Solution Overview
Problem
In wireless communication systems, particularly in device-to-device (D2D) communication, there is a challenge in coordinating cellular uplink and D2D transmissions to avoid resource and power wastage due to collisions, especially in scenarios like Vehicle-to-X (V2X) communications where simultaneous transmission is not feasible, and the network lacks awareness of the UE's buffer status and PPPP values.
Innovation Solution
A method and apparatus for a terminal device to receive scheduling configurations and uplink grants, determining scheduling priorities based on comparison with priority thresholds and transmission restrictions, and performing transmissions accordingly, while also reporting collisions to the network device to optimize resource allocation and prevent unnecessary scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device performs both D2D transmission and cellular uplink transmission in overlapping time resources, then the transmission capacity is improved, but resource and power wastage occurs due to collisions
Solution Approach 1:
The terminal device performs preliminary determination of scheduling priority for D2D transmission relative to cellular uplink transmission based on comparison between associated priority and priority threshold, as well as transmission restriction. This preliminary scheduling decision prevents collision before it occurs, allowing the device to perform only the higher-priority transmission and avoid wasting power on conflicting transmissions.
2Device complexity
If the network device schedules uplink transmission without awareness of UE buffer status and PPPP values, then the network control simplicity is maintained, but scheduling accuracy deteriorates
Solution Approach 1:
The terminal device autonomously determines the scheduling priority of D2D transmission by comparing associated priority with priority threshold and applying transmission restriction rules, without requiring network awareness of buffer status or PPPP values. This self-service mechanism maintains network control simplicity while achieving accurate scheduling decisions at the device level.
3Reliability
If the terminal device always prioritizes cellular uplink transmission over D2D transmission, then the cellular network reliability is improved, but D2D communication efficiency deteriorates
Solution Approach 1:
The terminal device dynamically adjusts transmission priority based on the associated priority value and transmission restriction conditions. When associated priority meets the threshold and transmission restriction is satisfied, D2D transmission is prioritized; otherwise, cellular uplink transmission takes precedence. This dynamic priority adjustment maintains cellular reliability while optimizing D2D communication efficiency based on real-time conditions.
Data Source
AI summary
Embodiments of the present disclosure provide methods, apparatuses and computer programs for scheduling a transmission. A method implemented at a terminal device comprises receiving, from a network device, a scheduling configuration for a device to device, D2D, transmission of the terminal device; receiving, from the network device, an uplink scheduling grant for a cellular uplink transmission in a same time resource overlapping with the D2D transmission; determining a scheduling priority for the D2D transmission relative to the cellular uplink transmission based on at least one of: a first comparison between an associated priority of the scheduling configuration and a first priority threshold, and a transmission restriction; and performing at least one of the D2D transmission and the cellular uplink transmission based on the determined scheduling priority. With embodiments of the disclosure, D2D transmission and cellular uplink transmission from a terminal device can he well coordinated.