Sidelink Discovery Resource Pool Allocation for Out-of-Coverage Terminals
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Solution Overview
Problem
Current wireless communication systems, particularly in the 3GPP LTE standard, do not effectively provide resource pool allocation methods for out-of-coverage wireless terminals to perform sidelink direct discovery, limiting their ability to communicate and discover other devices without network coverage.
Innovation Solution
A method and apparatus that allow wireless terminals to configure and use preconfigured radio resources for sidelink direct discovery operations when out of network coverage, including obtaining radio resources from preconfigured memory or through a Physical Sidelink Broadcast Channel, enabling out-of-coverage sidelink direct discovery and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless terminals use traditional network-based communication paths through base stations and gateways, then communication reliability is maintained, but communication capability is lost in out-of-coverage scenarios
Solution Approach 1:
The patent segments the communication system into two independent resource pools: in-coverage resource pools managed by the network and out-of-coverage resource pools pre-configured in the terminal. This segmentation allows the terminal to independently select appropriate resources based on coverage status, resolving the contradiction between network-dependent reliability and out-of-coverage adaptability.
Solution Approach 2:
The patent applies preliminary action by pre-configuring out-of-coverage resource pools in the terminal before the terminal enters coverage loss. This advance preparation ensures that when network coverage is unavailable, the terminal can immediately switch to using pre-configured resources without interruption, maintaining communication capability in out-of-coverage scenarios.
2Adaptability or versatility
If wireless terminals autonomously select radio resources for sidelink direct discovery, then resource allocation flexibility is improved, but resource collision and interference increase
Solution Approach 1:
The patent divides the resource space into dedicated in-coverage and out-of-coverage resource pools with non-overlapping time-frequency resources. This segmentation ensures that autonomous resource selection by terminals does not cause collisions between covered and uncovered terminals, as each terminal type operates in its own dedicated resource space.
Solution Approach 2:
The patent introduces a resource pool configuration message as an intermediary mechanism that carries resource pool information from the network to terminals. This intermediary enables coordinated resource allocation by providing terminals with network-configured resource pools, reducing random collisions while maintaining autonomous selection capability.
3Object-generated harmful factors
If preconfigured out-of-coverage resource pools are separated from in-coverage resource pools, then resource collision is reduced, but device complexity increases
Solution Approach 1:
The patent implements a universal resource pool configuration mechanism where a single configuration message structure can carry both in-coverage and out-of-coverage resource pool information. The terminal uses a unified selection criterion based on coverage status to choose between resource pools, reducing device complexity while maintaining resource pool separation.
4Loss of information
If resource pool information is broadcasted to all terminals, then information availability is improved, but network overhead increases
Solution Approach 1:
The patent applies local quality by providing different resource pool information to different terminal groups based on their coverage status. In-coverage terminals receive in-coverage resource pool configurations, while out-of-coverage terminals receive out-of-coverage resource pool configurations. This targeted information distribution improves relevance while reducing unnecessary network overhead.
Data Source
AI summary
Alternative techniques for providing out-of-coverage radio resources to out-of-coverage wireless terminals are provided. The alternative techniques may be used individually or in combination.