Dynamic Sidelink Resource Allocation via Uplink Sharing
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Solution Overview
Problem
In wireless communication, sidelink (SL) resources are often insufficient, leading to low data rates and underutilized uplink (UL) resources, resulting in limited throughput performance.
Innovation Solution
Dynamic sidelink resource allocation is achieved by allocating one or more uplink resources as shared SL resources, with the base station transmitting an allocation indication to UEs, allowing them to perform SL transceiving using these shared resources, which can be indicated through various signaling methods such as unicast, multicast, or broadcast, and utilizing conditions specified in RRC configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If SL resources are allocated for direct sidelink transmission, then SL data rate is improved, but UL resources become underutilized
Solution Approach 1:
The patent enables uplink resources to serve dual purposes: traditional uplink transmission to the base station and sidelink transmission between UEs. By allowing UL resources to be dynamically shared for SL transceiving, the system achieves multi-functionality where the same time-frequency resources can support both UL and SL operations, thereby improving SL data rate without leaving UL resources underutilized
Solution Approach 2:
The patent implements dynamic resource allocation where the base station can flexibly assign UL resources for SL use based on real-time traffic conditions. The allocation indication mechanism allows the system to adaptively switch resource usage between UL and SL modes, making the resource allocation dynamic rather than static, thus resolving the contradiction between SL data rate improvement and UL resource utilization
2Productivity
If more SL resources are allocated to improve throughput, then SL throughput is improved, but available UL resources are wasted
Solution Approach 1:
The patent merges the UL and SL resource pools by allowing UL resources to be allocated for SL transceiving. This combining of resource pools enables the system to utilize previously idle or underutilized UL resources for SL operations, thereby improving SL throughput without wasting UL resources. The base station acts as a coordinator to merge these resource pools dynamically based on network conditions
3Productivity
If UL resources are used for SL transceiving, then resource utilization efficiency is improved, but resource allocation complexity increases
Solution Approach 1:
The base station serves as an intermediary that manages the complexity of dynamic resource allocation. Instead of requiring direct negotiation and coordination between multiple UEs for resource sharing, the base station acts as a central mediator that receives allocation requests, determines resource availability, and issues allocation indications to the appropriate UEs. This intermediary approach simplifies the overall system complexity while achieving high resource utilization efficiency
Data Source
AI summary
Apparatus and methods are provided for dynamic sidelink (SL) resource allocation. In one novel aspect, one or more uplink (UL) resources are allocated for SL transceiving. In one embodiment, the UE establishes an SL connection with an SL peer UE, receives an allocation indication indicating one or more UL resources are available as shared SL resources for SL transceiving, wherein the allocation indication is originated from a gNB, and performs SL data transceiving with the SL peer UE using the one or more UL resources indicated in the allocation indication. In one embodiment, the UE receives the allocation indication through the Uu connection by unicast, multicast or broadcast. In one embodiment, the shared SL resources are indicated by RB ID or by SL grants. In one embodiment, conditions for using the shared SL resources are included in the allocation indication or are indicated in a separate RRC configuration.