D2D Resource Request via Scheduling Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE systems, the existing method for requesting uplink transmission resources between user equipment (UE) and eNodeB results in excessive scheduling overheads and delays, particularly in device-to-device (D2D) communication scenarios, where frequent interactions between UE and eNodeB lead to prolonged resource allocation times exceeding the required low delay threshold of 10 ms.
Innovation Solution
A method and apparatus that allow UE to directly request a D2D transmission resource from the eNodeB by sending a resource scheduling request carrying a D2D transmission resource indication, eliminating the need for an uplink grant and buffer status report (BSR), thereby reducing transmission resource overloads and scheduling delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the existing uplink resource request method (SR-UL Grant-BSR) is used, then the eNodeB can allocate transmission resources to UE, but the scheduling overhead is excessive and the delay exceeds 10 ms
Solution Approach 1:
The patent extracts and eliminates unnecessary signaling steps (UL Grant and BSR) from the resource request process. By allowing UE to directly indicate D2D transmission resource needs through a simplified SR mechanism, the patent removes redundant intermediate steps that contribute to overhead and delay, achieving faster resource allocation while maintaining eNodeB control.
Solution Approach 2:
Instead of the traditional approach where UE requests resources through multiple indirect steps (SR→UL Grant→BSR), the patent inverts the logic by enabling UE to directly indicate resource requirements in a streamlined manner. This inversion simplifies the signaling flow and reduces the number of round-trip communications needed.
2Reliability
If frequent communication between UE and eNodeB is maintained using existing procedures, then resource allocation can be performed, but transmission resource overhead becomes excessively high
Solution Approach 1:
The patent removes redundant signaling elements (UL Grant and BSR messages) from the resource allocation process. By keeping only the essential SR indication and direct resource allocation, the patent maintains reliable resource allocation while significantly reducing the consumption of transmission resources for signaling overhead.
3Loss of time
If the traditional scheduling procedure is used for D2D communication, then resource allocation can be performed, but the delay of 17.5 ms exceeds the required 10 ms low delay requirement
Solution Approach 1:
The patent extracts and removes intermediate signaling steps (UL Grant and BSR) that contribute to the 17.5 ms delay. By implementing a direct SR-to-resource-allocation mechanism, the patent reduces the number of processing steps and round-trip times, achieving the required sub-10 ms latency while maintaining operational simplicity through standardized procedures.
Solution Approach 2:
The patent enables UE to pre-indicate resource requirements through SR without waiting for UL Grant allocation. This preliminary indication allows eNodeB to prepare and allocate resources more efficiently, reducing the overall scheduling delay to meet the 10 ms requirement.
Data Source
AI summary
The present invention discloses a method which includes: receiving, by first UE, resource configuration information for communication between the first UE and an eNodeB; determining, by the first UE, data needing to be sent to second UE; determining, by the first UE, a D2D transmission resource indication needing to be sent; sending, by the first UE on a resource corresponding to the resource configuration information to the eNodeB, a resource SR carrying the D2D transmission resource indication, where the D2D transmission resource indication is used to request the eNodeB to allocate a D2D transmission resource to the first UE; receiving D2D transmission resource information used for sending the data to the second UE, where the D2D transmission resource information is allocated by the eNodeB according to the D2D transmission resource indication; and sending, by the first UE, the data to the second UE on the D2D transmission resource.