U2U Relay Discovery for Extended Wireless Coverage
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Solution Overview
Problem
Wireless communication systems face challenges in providing reliable communication between user equipment (UEs) due to limited transmit power, leading to coverage issues when UEs are out of range from base stations, especially in device-to-device networks where direct communication is not feasible.
Innovation Solution
Implementing a method for user-equipment-to-user-equipment (U2U) relay operations, where a UE discovers and utilizes a relay UE to access another UE, enabling communication through a discovery procedure that includes advertising relay services, responding to solicitations, and relaying messages between UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If direct sidelink communication is used between UEs, then communication simplicity is maintained, but coverage is limited due to lower transmit power relative to base stations
Solution Approach 1:
The patent introduces a relay UE as an intermediary node between the source UE and destination UE. The relay UE receives communications from the source UE and forwards them to the destination UE, enabling extended coverage beyond direct sidelink range. This mediator approach resolves the contradiction by sacrificing some structural complexity (adding relay nodes) to significantly expand coverage area.
2Area of stationary object
If relay communication is implemented to extend coverage, then coverage area is improved, but communication latency increases due to additional relay hops
Solution Approach 1:
The patent implements preliminary discovery procedures where UEs advertise and discover relay capabilities and available routes before actual communication occurs. By pre-establishing knowledge of relay nodes and their capabilities, the system minimizes latency during actual data transmission, as the routing decisions are already made based on pre-discovered information.
Solution Approach 2:
The patent enables dynamic relay selection and route discovery mechanisms that adapt to changing network conditions. The system can dynamically choose between direct sidelink communication when available and relay-based communication when needed, optimizing the balance between coverage extension and latency minimization based on real-time conditions.
3Adaptability or versatility
If relay discovery procedures are implemented, then relay accessibility is improved, but device complexity increases due to additional discovery messaging
Solution Approach 1:
The patent employs universal advertisement messages that serve multiple functions: announcing relay capabilities, discovering available routes, and indicating service support. This multi-functional approach improves relay accessibility while minimizing the increase in device complexity, as a single message type performs multiple discovery tasks rather than requiring separate specialized messages for each function.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless communication device (WCD) may initiate, based at least in part on a determination to participate in user-equipment-to-user-equipment (U2U) relay communication, a discovery procedure to discover one or more of access to a second WCD or services provided by the second WCD, the second WCD being accessible via a third WCD. The WCD may communicate, for example U2U communications, with the second WCD via the third WCD based at least in part on the discovery procedure. Numerous other aspects are provided.