Uplink Resource Allocation for Cellular and D2D Communications
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently allocating resources for both direct device-to-device (D2D) and cellular communications, leading to signal collisions and suboptimal priority management, especially in scenarios where direct communications require high urgency like public safety applications.
Innovation Solution
A method where user equipment (UE) requests uplink resources from a network node, indicating whether the communication is for cellular or direct D2D, allowing the network to prioritize and allocate resources accordingly, using techniques such as time division multiplexing, dedicated resources, and timer-based approaches to minimize collisions and ensure timely resource grants for high-priority direct communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network node centrally controls resource allocation for both cellular and D2D communications, then signal collisions are reduced, but the system complexity and difficulty of managing dual communication modes increase
Solution Approach 1:
The patent segments the scheduling request resources into two distinct sets: one set for cellular communication scheduling requests and another set for D2D communication scheduling requests. This segmentation allows the network node to centrally control resource allocation while simplifying the management process by treating each communication type separately, thus resolving the contradiction between collision reduction and system complexity.
2Reliability
If dedicated resources are allocated for D2D communications, then communication reliability is improved, but the loss of time for resource setup and the system complexity increase
Solution Approach 1:
The patent merges the resource allocation processes for cellular and D2D communications by having the network node handle scheduling requests for both types on the same uplink resources. The network node differentiates between the two types based on the scheduling request content and applies appropriate resource grants. This merging approach reduces the time required for separate resource setup while maintaining reliability through centralized control.
3Ease of operation
If user equipment autonomously selects resources from a reserved pool for D2D communication, then the ease of operation is improved, but signal collisions increase
Solution Approach 1:
The patent introduces the network node as an intermediary that mediates resource allocation for D2D communications. Instead of allowing user equipment to autonomously select resources which would lead to collisions, the network node receives scheduling requests from user equipment and centrally allocates appropriate uplink resources, thereby maintaining ease of operation for users while preventing signal collisions through centralized coordination.
4Manufacturing precision
If separate resource pools are maintained for cellular and D2D communications, then resource allocation precision is improved, but the loss of time for resource management and system complexity increase
Solution Approach 1:
The patent makes the uplink resource pool universal by allowing it to serve both cellular and D2D communication purposes. The network node receives scheduling requests for both types of communications on the same uplink resources and allocates appropriate grants based on the request type. This multi-functionality approach maintains precise resource allocation while reducing the time and complexity associated with managing separate resource pools.
Data Source
Figure 1
Figure 2~5
Figure 6~7b
AI summary
The application discusses the allocation of resources to user equipment for uplink cellular and direct device to device communications. A user equipment method of requesting uplink resource from a network node is disclosed. The method comprises: selecting a transmission of a scheduling request on a resource, in dependence upon whether the uplink data is to be transmitted as a cellular communication to at least one other user equipment transmitted via at least one network node or as a direct communication directly to at least one other user equipment; transmitting the scheduling request on the resource, transmission of the scheduling request indicating whether the request is related to the cellular communication or may be for the direct communication.