MAC Layer QoS Enforcement for Sidelink Relay
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Solution Overview
Problem
Current NR sidelink communication systems face limitations in extending coverage and ensuring quality of service (QoS) for sidelink-based communications, particularly in scenarios without Uu coverage, where single-hop sidelink coverage is insufficient to meet enhanced QoS requirements.
Innovation Solution
A method implemented in a Wireless Transmit/Receive Unit (WTRU) determines priority levels for uplink and sidelink data transmissions based on logical channel priorities, comparing and transmitting data accordingly to ensure optimal QoS, with the WTRU configured to handle layer 2 and layer 3 relay operations, including adaptation layer mappings and quality of service (QoS) requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-hop sidelink communication is used, then device complexity is reduced, but coverage area and reliability are insufficient for enhanced QoS requirements
Solution Approach 1:
The patent segments the communication path into multiple hops through relay WTRUs, where each hop maintains direct Uu coverage connection. This segmentation allows coverage extension while maintaining QoS reliability by ensuring each segment has proper QoS enforcement at the MAC layer.
Solution Approach 2:
Relay WTRUs act as intermediaries between remote WTRUs and the network, providing coverage extension while maintaining QoS requirements. The relay WTRU receives data from remote WTRU via sidelink and forwards it to the network via Uu interface, ensuring QoS enforcement at each transmission point.
2Reliability
If priority-based transmission scheduling is implemented, then QoS reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies preliminary action by determining priorities of logical channels in advance before actual data transmission. The MAC layer pre-configures priority levels for different logical channels based on QoS requirements, allowing efficient scheduling decisions without complex real-time calculations during transmission.
Solution Approach 2:
The patent changes the parameter of priority determination from dynamic calculation to static configuration. By pre-defining priority levels for logical channels at the MAC layer, the system simplifies the scheduling process while maintaining QoS enforcement through parameter-based differentiation rather than complex algorithms.
3Reliability
If sidelink logical channel priority mapping is configured, then QoS for sidelink transmissions is improved, but adaptability to different relay scenarios is reduced
Solution Approach 1:
The patent achieves universality by creating a unified priority mapping mechanism that works across different relay scenarios (WTRU-to-network relay, WTRU-to-WTRU relay, multi-hop relay). The same MAC layer priority determination and logical channel mapping principles apply universally, allowing the system to handle various relay configurations with a single framework.
Solution Approach 2:
The patent applies dynamics by making the priority mapping configurable and adaptable to different relay scenarios. The network can dynamically adjust priority mappings based on the specific relay configuration and QoS requirements, allowing the system to adapt to varying scenarios while maintaining structured QoS enforcement through the MAC layer.
Data Source
AI summary
The disclosure pertains to methods and apparatus for quality of service ((QoS) enforcement at the media access control (MAC) layer and, more particularly, to methods and apparatus for determining priority of sidelink and uplink data transmissions in a network.