Logical Channel Mapping Across TRPs for QoS-Aware Uplink MAC
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling logical channels with varying QoS requirements across multiple transmit/receive points (TRPs) with differing transmission capabilities, leading to suboptimal data transmission.
Innovation Solution
A method and apparatus for logical channel handling in wireless communication systems, involving UE and network nodes that identify and prioritize logical channels based on mapping information for TRPs, generating and transmitting MAC PDUs through suitable TRPs to meet QoS requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs are used for data transmission to improve system capacity and coverage, then transmission reliability and coverage are improved, but device complexity and logical channel management complexity increase
Solution Approach 1:
The patent segments logical channels into multiple groups, where each group is associated with specific TRPs. This segmentation allows the UE to manage logical channels more efficiently by determining which TRP to use based on the logical channel group, thereby reducing the complexity of selecting among multiple TRPs while maintaining transmission reliability.
Solution Approach 2:
The patent establishes mapping information between logical channel groups and TRPs in advance. This preliminary configuration enables the UE to quickly determine the appropriate TRP for each logical channel without performing complex real-time decisions, thus reducing management complexity while ensuring reliable transmission.
2Reliability
If TRP selection is based on radio link status to improve QoS, then transmission quality is improved, but processing time and complexity increase
Solution Approach 1:
The patent pre-configures mapping information that associates logical channel groups with specific TRPs. When uplink data needs to be transmitted, the UE can directly determine the appropriate TRP based on this pre-established mapping relationship without performing complex real-time radio link status analysis, thus reducing processing time while maintaining QoS requirements.
Solution Approach 2:
The patent applies different TRPs to different logical channel groups based on their specific QoS requirements. Each logical channel group can be mapped to TRPs that are best suited for its particular transmission characteristics, allowing localized optimization of transmission quality without requiring system-wide complex processing.
3Productivity
If logical channels are mapped to specific TRPs to improve transmission efficiency, then productivity is improved, but system complexity and configuration complexity increase
Solution Approach 1:
The patent divides logical channels into multiple groups and establishes mapping relationships between logical channel groups and TRPs. This segmentation approach improves transmission efficiency by enabling the UE to quickly determine which TRP to use for each logical channel group, while the structured grouping mechanism keeps the system complexity manageable through organized configuration.
Solution Approach 2:
The mapping information structure designed in the patent serves multiple functions: it identifies TRP selection, organizes logical channels into groups, and provides a framework for QoS management. This multi-functionality improves transmission efficiency while avoiding the need for separate complex configuration mechanisms for each function.
Data Source
AI summary
The present disclosure relates to logical channel handling in wireless communications. According to an embodiment of the present disclosure, a method performed by a user equipment (UE) configured to operate in a wireless communication system comprises: identifying mapping information for one or more transmit/receive points (TRPs) associated with each of logical channels; receiving an uplink (UL) grant associated with a TRP among the TRPs; determining one or more logical channels associated with the TRP among the logical channels based on the mapping information; generating a media access control (MAC) protocol data unit (PDU) of the one or more logical channels associated with the TRP; and transmitting the MAC PDU via the TRP.