Two-Hop Wireless Link Scheduling Through Relay Sidelink Retransmissions
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in scheduling two-hop communication links, particularly in managing sidelink retransmissions between user equipment and network nodes, which can lead to suboptimal resource utilization and communication delays.
Innovation Solution
A method and apparatus for a controller user equipment (UE) to transmit a relay scheduling request to a network node for scheduling access to a universal mobile telecommunications system air interface (Uu) based on relaying sidelink retransmissions, enabling efficient communication of sidelink retransmissions between the UE and the network node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional scheduling methods are used for two-hop communication links, then device complexity is reduced, but communication delays increase and resource utilization becomes suboptimal
Solution Approach 1:
The patent introduces a relay UE as an intermediary node between the network node and remote UEs. The relay UE receives scheduling requests from remote UEs, forwards them to the network node, and relays data transmissions. This intermediary approach reduces communication delays by establishing direct relay paths while maintaining manageable complexity through standardized relay protocols and procedures.
2Productivity
If relay scheduling requests are implemented for sidelink retransmissions, then resource allocation efficiency improves, but signaling overhead increases
Solution Approach 1:
The patent combines multiple scheduling requests into a single relay scheduling request message. When a relay UE has multiple remote UEs pending scheduling, it aggregates their requests into one unified signaling message to the network node. This merging approach improves resource allocation efficiency by providing a comprehensive view of relay needs while significantly reducing signaling overhead compared to individual requests from each remote UE.
Solution Approach 2:
The relay scheduling request mechanism serves multiple functions: it schedules uplink transmissions from relay to network node, schedules downlink transmissions from network node to relay, and coordinates retransmission resources for sidelink communications. This multi-functional approach improves resource allocation efficiency across different communication directions and types while using a single standardized signaling procedure.
3Manufacturing precision
If centralized scheduling control is used by network nodes, then resource allocation optimality improves, but system responsiveness deteriorates
Solution Approach 1:
The patent implements preliminary scheduling actions where the network node provides advance scheduling grants and configurations to relay UEs before actual data transmissions occur. Relay UEs receive pre-configured resource allocations, timing advance commands, and scheduling parameters in advance, enabling them to quickly respond to transmission opportunities without waiting for real-time network node decisions, thus improving system responsiveness while maintaining centralized optimization.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a controller user equipment (UE) may transmit, to a network node, a relay scheduling request that indicates a request to schedule access to a universal mobile telecommunications system air interface (Uu) based at least in part on relaying one or more sidelink retransmissions associated with at least a first sidelink between the controller UE and a first sidelink UE. The UE may communicate the one or more sidelink retransmissions between the controller UE and the network node based at least in part on using the Uu. Numerous other aspects are described.