Uplink Priority Mapping for URLLC Multiplexing
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Solution Overview
Problem
Current LTE and NR wireless communication systems face challenges in uplink transmission, particularly in simultaneous transmission of multiple physical uplink control channels (PUCCHs) and the lack of support for simultaneous transmission of both PUCCH and physical uplink shared channel (PUSCH), leading to inefficiencies in multiplexing and prioritization of uplink channels for ultra-reliable low-latency communication (URLLC).
Innovation Solution
The proposed solution involves associating a priority with uplink data channels and determining corresponding logical channel sets based on these priorities, allowing for efficient mapping and separate transmission of data on physical channels with different quality of service (QoS) requirements, using network device configurations and pre-defined mapping relationships to reduce signaling overheads and ensure stability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink multiplexing is performed when PUCCHs overlap or PUCCH overlaps PUSCH, then resource utilization is improved, but transmission reliability deteriorates due to lack of priority differentiation
Solution Approach 1:
The patent segments uplink channels into different priority levels (first priority and second priority). When channels of different priorities overlap, the high-priority channel is transmitted while the low-priority channel is dropped. This segmentation by priority level resolves the contradiction by ensuring that resource multiplexing does not compromise the reliability of urgent transmissions.
Solution Approach 2:
The patent introduces a priority parameter to differentiate uplink channels. By changing the parameter of priority level assigned to each channel, the system can dynamically decide which channel to transmit when overlaps occur. This parameter change enables both efficient resource utilization and reliable transmission of high-priority data.
2Device complexity
If simultaneous transmission of multiple PUCCHs is not supported, then device complexity is reduced, but transmission efficiency deteriorates for URLLC scenarios
Solution Approach 1:
The patent dynamically selects which PUCCH to transmit based on priority levels when simultaneous transmission is not supported. Instead of static rules, the system dynamically evaluates priority parameters and chooses the highest-priority channel for transmission. This dynamic approach maintains low device complexity while improving transmission efficiency for time-sensitive URLLC traffic.
3Adaptability or versatility
If priority of uplink data channel is associated with logical channel, then QoS differentiation is improved, but device complexity increases due to mapping management
Solution Approach 1:
The patent establishes mapping relationships between logical channels and priority levels in advance, before actual transmission occurs. This preliminary configuration of logical channel to priority mappings reduces the complexity during runtime by pre-defining which logical channels correspond to which priority levels, enabling efficient QoS differentiation without complex real-time decision-making.
Data Source
AI summary
This application provides an uplink transmission method and a communication apparatus, to determine, based on a priority of a PUSCH, a logical channel set corresponding to the PUSCH, generate a MAC PDU based on the logical channel set corresponding to the PUSCH, and send the MAC PDU on the PUSCH. Based on this solution, a priority of an uplink data channel is associated with a logical channel, to provide a solution for mapping data of the logical channel to the uplink data channel.