Coordinated Uplink Transmission for XR User Equipment
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Solution Overview
Problem
Existing wireless communication systems face challenges in coordinating transmissions among user equipment (UEs) in extended reality (XR) applications, particularly in ensuring timely and efficient data exchange to maintain immersive experiences.
Innovation Solution
A method and system where a first WTRU (anchor UE) receives configuration information for UTRUs in a group, determines timing information, and selects configured grants (CGs) based on threshold values, then indicates the selected CGs and UTRU IDs to the network to facilitate coordinated transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coordinated transmissions are implemented among UEs in XR applications, then the quality and reliability of immersive experiences are improved, but the complexity of transmission coordination and resource allocation increases
Solution Approach 1:
The network entity acts as an intermediary to receive timing information from multiple UEs, determine appropriate configured grants, and allocate resources centrally. This mediator approach coordinates transmissions among UEs without requiring direct complex coordination between each UE pair, thus improving reliability while managing complexity through centralized control.
Solution Approach 2:
The system dynamically adjusts timing information parameters (such as timing offsets and thresholds) to optimize transmission coordination. By changing these parameters based on network conditions and UE requirements, the system improves immersion quality while maintaining manageable coordination complexity through parameter optimization rather than structural complexity.
2Reliability
If timing information is collected and processed for multiple UEs, then transmission coordination is improved, but the processing time and computational requirements increase
Solution Approach 1:
The network entity collects timing information from multiple UEs in advance before making transmission coordination decisions. This preliminary collection of timing data allows the network to prepare and determine appropriate configured grants proactively, reducing last-minute processing delays and improving overall transmission coordination efficiency.
Solution Approach 2:
Each UE autonomously determines its own timing information based on local measurements and reports it to the network. This self-service approach at the UE level reduces the computational burden on the network, as each UE performs initial timing analysis independently before the network consolidates and makes final coordination decisions.
3Productivity
If configured grants are selected and allocated dynamically, then resource allocation efficiency is improved, but the signaling overhead and network load increase
Solution Approach 1:
The configured grant mechanism serves multiple functions simultaneously: it allocates uplink resources, coordinates timing among multiple UEs, and manages transmission schedules. This multi-functionality reduces the need for separate signaling for each function, thereby improving resource allocation efficiency while minimizing additional signaling overhead.
Solution Approach 2:
The system reuses and recycles configured grant allocations across different UEs and time periods. Once a configured grant is determined and allocated, it can be applied to multiple transmissions and UEs, reducing the need for continuous new grant signaling. This recovery and reuse approach improves resource allocation efficiency while reducing ongoing signaling overhead.
Data Source
AI summary
Methods, apparatus, and systems are disclosed. In one method, a first WTRU of a WTRU group receives configuration information indicating WTRU IDs for one or more WTRUs in the WTRU group, one or more configured grants (CGs) associated with the one or more WTRUs, and a threshold value. The method may further include, on condition that the first WTRU determines that respective timing information associated with a respective one of the one or more WTRUs is above the threshold value, determining for the respective WTRU a respective preferred CG and indicating the respective preferred CG and WTRU ID of the respective WTRU to the network.