Sidelink Resource Pool Coordination for Out-of-Coverage D2D UEs
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Solution Overview
Problem
In device-to-device (D2D) communications, resource collisions occur frequently due to UEs operating in autonomous selection mode without coordination, leading to transmission failures and inefficiencies, especially for remote UEs outside network coverage.
Innovation Solution
A resource allocation mechanism where a relay UE coordinates resource selection for remote UEs, minimizing collisions by selecting or scheduling resources that avoid overlaps with other transmissions, and reducing signaling overhead through extended allocation periods and preconfigured resource pools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs operate in autonomous selection mode for D2D communication, then device autonomy and operation outside network coverage are enabled, but resource collisions and transmission failures increase
Solution Approach 1:
The patent introduces a relay UE as an intermediary between remote UEs and the network, and between remote UEs themselves. The relay UE coordinates resource selection, receives resource allocations from the network, and shares them with remote UEs, thereby reducing collisions while maintaining autonomous operation. This mediator resolves the contradiction by enabling coordinated resource usage without requiring direct network coverage at each UE.
Solution Approach 2:
The relay UE performs preliminary actions by pre-configuring resource pools and pre-coordinating resource selections with remote UEs before actual D2D transmissions occur. The relay UE receives resource allocations from the network in advance and distributes them to remote UEs, preventing resource collisions before they happen rather than reacting to them during transmission.
2Reliability
If relay UE coordinates resource selection for remote UEs, then resource collision is reduced, but signaling overhead increases
Solution Approach 1:
The patent merges multiple signaling functions into unified messages. The relay UE consolidates resource allocation information for multiple remote UEs into single coordination messages, and combines resource pool configuration with resource allocation signaling. This reduces the total number of separate signaling exchanges while maintaining comprehensive resource coordination.
Solution Approach 2:
The relay UE performs multiple functions using the same signaling mechanisms: it configures resource pools, allocates specific resources, coordinates between multiple remote UEs, and manages retransmissions all through unified signaling procedures. This multi-functionality reduces overall signaling overhead compared to having separate dedicated signaling for each function.
3Loss of information
If extended allocation periods and preconfigured resource pools are used, then signaling overhead is reduced, but resource flexibility decreases
Solution Approach 1:
The system implements dynamic resource allocation within preconfigured resource pools. While the resource pools themselves are pre-configured to reduce signaling, the specific resource selections and allocations within those pools are dynamically adjusted by the relay UE based on current transmission needs, channel conditions, and collision avoidance requirements. This maintains flexibility while reducing overhead.
Solution Approach 2:
The resource space is segmented into preconfigured resource pools that are established in advance to reduce signaling overhead. Within each pool, specific resources are dynamically allocated to different remote UEs and transmission types. This segmentation allows the system to maintain flexibility at the allocation level while using static configuration at the pool level to reduce signaling.
Data Source
AI summary
Methods and apparatus are disclosed for configuring sidelink radio resources between a first user equipment within coverage of a base station and a second user equipment that is outside of coverage of the base station. The first user equipment receives from the base station a configuration of a first sidelink resource pool. The first user equipment then transmits to the second user equipment an identification of a second sidelink resource pool that includes a subset of radio resources of the first sidelink resource pool and scheduling information for a sidelink transmission by the second user equipment. The first user equipment then receives a sidelink transmission using at least one of the radio resources from the second user equipment.