Logical Channel Prioritization via Priority Index for URLLC Grants
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Solution Overview
Problem
Current logical channel prioritization in wireless communication systems lacks clear guidelines for reliability aspects, leading to challenges in ensuring suitable grants for ultra-reliable low-latency communications (URLLC) services, particularly in mixed scenarios with both enhanced mobile broadband (eMBB) and URLLC traffic.
Innovation Solution
The introduction of a priority index, 'allowedPriorityLevels,' which allows logical channels to be configured with high, low, or no priority levels, enabling the network to determine suitable uplink grants based on priority indications, ensuring that high-priority traffic like URLLC is transmitted only on reliable grants with low block error rate (BLER) targets, while allowing flexible use of grants for eMBB traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If logical channel prioritization is performed without clear reliability guidelines, then device complexity is reduced and ease of operation is improved, but reliability of URLLC transmission cannot be ensured
Solution Approach 1:
The patent introduces a new parameter 'allowedPriorityLevels' that can take specific values (high, low, not configured) to explicitly control the mapping between logical channels and uplink grants. This parameter change enables the system to differentiate between eMBB and URLLC traffic priorities, ensuring reliable transmission by restricting high-priority logical channels to use only high-priority grants, while resolving the contradiction by providing clear configuration guidelines that manage complexity through standardized parameter options.
2Reliability
If strict priority-based grant selection is implemented for all traffic, then reliability of high-priority traffic is improved, but productivity and resource utilization deteriorate due to restricted grant usage
Solution Approach 1:
The patent applies different priority mapping rules to different logical channels based on their specific requirements. High-priority logical channels (e.g., URLLC) are restricted to high-priority uplink grants to ensure reliability, while low-priority logical channels (e.g., eMBB) can utilize any available grant including high-priority grants when resources are available. This local differentiation of quality requirements resolves the contradiction by ensuring strict priority compliance where needed while allowing flexible resource utilization elsewhere.
Solution Approach 2:
The priority mapping mechanism dynamically adapts grant selection based on the 'allowedPriorityLevels' configuration and current resource availability. When high-priority grants are available, they are allocated to high-priority logical channels; when unavailable, the system dynamically adjusts by allowing low-priority logical channels to use available grants. This dynamic behavior ensures reliability for critical traffic while maintaining overall system productivity and resource utilization efficiency.
3Adaptability or versatility
If multiple priority levels are configured for logical channels, then adaptability to different service types is improved, but device complexity increases due to additional configuration parameters
Solution Approach 1:
The patent introduces the 'allowedPriorityLevels' parameter with a limited set of predefined values (high, low, not configured) that can be applied to logical channel configurations. This parameter enables the system to support multiple service types (eMBB and URLLC) by allowing different priority mappings for different logical channels. The contradiction is resolved by providing a standardized, limited set of configuration options that enhance adaptability while managing device complexity through consistent parameter definitions and clear interpretation rules.
Data Source
AI summary
According to some embodiments, a method performed by a wireless device comprises receiving (312) an allowed priority level for a logical channel and receiving (314) an uplink grant with a priority indication. In response to the priority indication corresponding to the allowed priority level, the method further comprises transmitting (318) the logical channel in the uplink grant.