RAN Delay Budget Adjustment for XR Downlink Continuity
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Solution Overview
Problem
Existing delay budget adjustment mechanisms in wireless communication systems are inadequate for millisecond-level transmission requirements of extended reality (XR) services, leading to transmission errors or resource wastage.
Innovation Solution
A communication method that adjusts the delay budget of downlink data packets based on the correspondence and transmission status of uplink data packets, using a radio access network device to enhance the rate of delay budget adjustment and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If delay budget adjustment is performed at a large granularity (seconds level), then the core network can maintain overall network stability, but it cannot match the millisecond-level transmission delay budget requirements of XR video frames
Solution Approach 1:
The patent segments the delay budget adjustment function into two parts: the core network performs coarse-grained adjustment at second level for overall stability, while the radio access network device performs fine-grained adjustment at millisecond level for video frame timing. This segmentation allows each network element to operate at its optimal granularity, resolving the contradiction between network stability and adjustment responsiveness.
Solution Approach 2:
The patent introduces a new dimension of adjustment granularity by enabling the radio access network device to independently adjust delay budgets at millisecond level based on video frame timing requirements, complementing the core network's second-level adjustment. This multi-dimensional adjustment approach simultaneously achieves both network stability and millisecond-level responsiveness.
2Productivity
If delay budget is adjusted frequently to match video frame timing, then transmission continuity is maintained, but network complexity increases
Solution Approach 1:
The patent merges the delay budget adjustment functions of the core network and radio access network device, where the radio access network device leverages the core network's delay budget settings and performs additional fine-grained adjustments locally. This combining approach enables frequent adjustments without proportionally increasing overall system complexity, as the radio access network device uses the core network's configuration as a baseline.
3Reliability
If delay budget adjustment is performed at millisecond level for each video frame, then transmission errors are reduced, but air interface transmission resources are wasted
Solution Approach 1:
The patent implements dynamic delay budget adjustment where the radio access network device continuously monitors actual transmission timing and adjusts the delay budget for subsequent video frames based on observed deviations. This dynamic approach ensures transmission accuracy by adapting to real-time conditions while avoiding unnecessary adjustments when timing is already accurate, thereby reducing air interface resource waste.
Solution Approach 2:
The patent establishes a feedback mechanism where the radio access network device monitors the actual arrival timing of video frames and uses this information to adjust the delay budget for future frames. This feedback-based adjustment ensures transmission reliability by correcting timing deviations only when necessary, preventing resource waste from unnecessary adjustments.
Data Source
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AI summary
In a communication method, a radio access network device dynamically adjusts a transmission delay budget of a downlink data packet based on a transmission status of an uplink data packet and a correspondence that is between the uplink data packet and the downlink data packet and that is determined by a core network, to increase a speed of adjusting the transmission delay budget of the downlink data packet.