Relay UE Sidelink Transport Block Prioritization Multiplexing
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Solution Overview
Problem
Current 5G NR technology faces challenges in efficiently relaying multiple transport blocks (TBs) over sidelinks, particularly in prioritizing and multiplexing them effectively for optimal communication.
Innovation Solution
A method where a first user equipment (UE) receives transport blocks from multiple UEs with different priorities and forwards them to other UEs via physical layer multiplexing over sidelinks, based on these priorities, using techniques such as amplify-and-forward (AF) or decode-and-forward (DF) relaying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transport blocks are relayed over sidelinks without prioritization, then all TBs can be transmitted, but communication efficiency and resource allocation are degraded
Solution Approach 1:
The relay UE performs preliminary prioritization of received transport blocks based on priority indicators before forwarding. This advance classification enables efficient resource allocation and multiplexing decisions, improving communication efficiency without adding complex real-time processing during transmission
Solution Approach 2:
The relay UE segments the relayed TBs into different priority groups and handles them separately through distinct multiplexing schemes. High-priority TBs are multiplexed differently from low-priority TBs, allowing optimized resource allocation for each category while maintaining manageable processing complexity
2Reliability
If transport blocks are multiplexed without priority-based differentiation, then resource allocation is simplified, but communication reliability for urgent data is reduced
Solution Approach 1:
Different multiplexing strategies are applied to different priority levels of TBs. High-priority TBs receive dedicated resources and simpler multiplexing treatment, while low-priority TBs utilize remaining resources with different multiplexing schemes. This localized quality differentiation ensures reliable transmission for urgent data while managing overall system complexity
3Speed
If amplify-and-forward relaying is used for multiple TBs, then transmission speed is maintained, but resource allocation efficiency decreases
Solution Approach 1:
The relay UE dynamically selects between AF and DF relaying modes based on the priority and characteristics of received TBs. For high-priority TBs requiring speed, AF mode is used to maintain transmission speed. For other TBs, DF mode enables better resource allocation efficiency. This dynamic adaptation resolves the contradiction between speed and resource efficiency
4Productivity
If decode-and-forward relaying is used for multiple TBs, then resource allocation efficiency is improved, but transmission latency increases
Solution Approach 1:
The relay UE performs preliminary decoding of received TBs before forwarding, but optimizes this process by using previously decoded information and cached data when available. This preliminary action enables efficient resource allocation while reducing the time penalty of decoding, mitigating the latency increase associated with DF relaying
Data Source
AI summary
A first UE may receive, from a second UE via a first sidelink, a first TB. The first TB may be associated with a first priority. The first UE may receive, from a third UE via a second sidelink, a second TB. The second TB may be associated with a second priority. The first UE may forward the first TB to a fourth UE and the second TB to a fifth UE via physical layer multiplexing over a third sidelink and a fourth sidelink, respectively, based on the first priority and the second priority. To forward the first TB to the fourth UE and the second TB to the fifth UE, the first UE may perform an AF operation or a DF operation.