Delay-Aware Logical Channel Prioritization for XR
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Solution Overview
Problem
Conventional logical channel prioritization (LCP) procedures in wireless communications systems do not adequately consider delay status, leading to urgent/delay-critical data being overlooked in favor of higher priority non-urgent data, especially in extended reality (XR) communications where strict packet delay budgets are critical.
Innovation Solution
Enhanced LCP procedures that prioritize delay-critical data by incorporating delay status reporting (DSR) and buffer size information, ensuring urgent data is transmitted even if higher priority data is present in the buffer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional logical channel prioritization procedures are used, then higher priority non-urgent data is transmitted first, but delay-critical data may be overlooked and fail to meet packet delay budgets
Solution Approach 1:
The patent segments the prioritization process into two distinct stages: first allocating resources based on logical channel priority, then performing a second allocation pass specifically for delay-critical data. This segmentation allows the system to handle both high-priority non-urgent data and delay-critical data without one category completely dominating the other, ensuring that delay-critical data receives dedicated attention in the second allocation stage.
Solution Approach 2:
The patent introduces preliminary action by having the UE determine delay status and identify delay-critical data before the resource allocation process begins. The network is informed of this delay status in advance, allowing it to prepare appropriate resource allocations that specifically account for delay-critical data needs before the actual transmission scheduling occurs.
2Reliability
If delay status reporting is implemented, then delay-critical data can be identified and prioritized, but system complexity increases due to additional signaling and processing
Solution Approach 1:
The patent extracts the delay status determination function from the overall resource allocation process, creating a separate, dedicated mechanism for identifying delay-critical data. This extracted function operates independently and provides specific information to the network, allowing the complex delay-aware prioritization logic to be isolated and managed separately from the standard logical channel prioritization procedures.
Solution Approach 2:
The delay status reporting mechanism is designed to be universal and multi-functional. It not only identifies delay-critical data for prioritization purposes but also provides the network with information needed to optimize resource allocation across all logical channels. This single mechanism serves multiple functions: delay detection, prioritization guidance, and resource allocation optimization, reducing the need for separate specialized systems.
Data Source
AI summary
Various aspects of the present disclosure relate to techniques for delay-aware logical channel prioritization. A user equipment (UE) is configured to establish a logical channel based on a received configuration, the configuration comprising a logical channel priority for the logical channel, determine a first parameter associated with data of the logical channel, and calculate a priority value for the data of the logical channel based at least in part on the first parameter and the logical channel priority in response to determining that the first parameter is below a threshold.