Sidelink QoS Flow Mapping for Channel Access Priority Determination
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Solution Overview
Problem
In wireless communication systems, determining the channel access priority (CAPC) for a sidelink radio bearer (SLRB) that includes multiple quality of service (QoS) flows is challenging, especially when there is a many-to-one mapping of QoS flows to a data radio bearer (DRB).
Innovation Solution
A method where a user equipment (UE) maps multiple QoS flows to a DRB and determines the CAPC for the DRB based on predefined rules. These rules can be configured at the UE or signaled dynamically by a base station (BS), considering factors such as the lowest or highest access priority among the QoS flows, the priority of the greatest number of QoS flows with the same priority, and the type of transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple QoS flows are mapped to a single data radio bearer (DRB), then the system can support more diverse quality of service requirements, but the user equipment (UE) cannot determine which channel access priority class (CAPC) to use for transmission
Solution Approach 1:
The patent segments the determination of CAPC by introducing separate priority indicators for different QoS flows (5QI and PQI). Each QoS flow maintains its own priority information, allowing the system to handle multiple QoS requirements while providing a structured method to select the appropriate CAPC based on these segmented priority indicators.
Solution Approach 2:
Instead of having a single CAPC for the DRB, the patent inverts the approach by allowing multiple QoS flows with different priorities to coexist on the same DRB. The UE then selects the CAPC based on the priority requirements of the specific QoS flows being transmitted, rather than using a fixed DRB-level priority.
2Reliability
If a UE uses the lowest access priority among all logical channels to determine CAPC for configured grant transmission, then the transmission can be performed, but higher priority QoS flows may experience delays due to conservative channel access
Solution Approach 1:
The patent introduces dynamic CAPC selection where the UE can adaptively choose between different CAPC determination methods based on the specific transmission scenario. For configured grants, the UE may use the lowest priority approach for reliability, while for scheduled grants or specific QoS requirements, the UE can select higher priority CAPCs to improve transmission speed, making the system dynamic rather than static.
Solution Approach 2:
The patent changes the parameter used for CAPC determination from a fixed lowest-priority approach to a flexible selection mechanism. The UE can change the effective CAPC parameter based on the QoS requirements of active flows, the type of grant (configured vs. scheduled), and network conditions, allowing optimization between reliability and speed by adjusting this critical parameter.
Data Source
AI summary
Wireless communication devices, systems, and methods related to mechanisms to aid a user equipment (UE) in determining the channel access priority (CAPC) to use for a data radio bearer (DRB) on sidelink that includes multiple quality of service (QOS) flows for a transmission. The UE may receive an indication from a base station (BS) regarding what CAPC to use, or it may itself determine the CAPC based on a rule. The UE may map the plurality of QoS flows to the DRB and transmit the QoS flows using the DRB and the selected CAPC.