Early Detection of Forwarding for Multi-Hop URLLC
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Solution Overview
Problem
In wireless communications systems, the process of relaying communications using a donor UE can increase latency and affect the ability of the network to support retransmissions, especially when signal blockage occurs between a base station and a target UE.
Innovation Solution
The donor UE detects at an early stage that a packet is addressed to the target UE by identifying a radio network temporary identifier (RNTI) scrambling code, allowing it to forward the packet without full decoding, thereby reducing the round-trip time for packet transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a donor UE relays communications between the base station and target UE to avoid signal blockage, then communication reliability is improved, but latency increases and retransmission capability deteriorates
Solution Approach 1:
The donor UE performs early detection of packets addressed to the target UE by identifying RNTI scrambling codes before full decoding. This preliminary action allows the donor UE to forward packets immediately upon detection, bypassing the need to wait for complete packet reception and decoding, thereby reducing latency while maintaining reliable communication through the relay path
2Speed
If the donor UE forwards packets without full decoding by detecting RNTI scrambling codes, then transmission speed is improved, but processing accuracy may deteriorate
Solution Approach 1:
The system extracts only the essential RNTI scrambling code portion from the packet for identification purposes. The donor UE detects and forwards packets based on this extracted identifier without performing full packet decoding, achieving fast transmission speed while maintaining accurate packet identification through the specialized RNTI detection mechanism
3Loss of time
If early detection and forwarding is implemented, then round-trip time is reduced, but device complexity increases
Solution Approach 1:
The packet processing function is segmented into two distinct operations: early detection of RNTI scrambling codes for packets addressed to the target UE, and full decoding for other packets. This segmentation allows the donor UE to apply simplified processing only when needed (for target UE packets), reducing the average processing complexity while achieving reduced round-trip time through early forwarding
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some communications systems, interference may impede signaling between a base station and a target user equipment (UE) such that a base station may identify a donor UE to relay communications to the target UE. The donor UE may receive a coded data packet from the base station, and may identify a radio network temporary identifier (RNTI) scrambling code for the packets addressed to the target UE. In cases where the donor UE identifies that the packet has an RNTI scrambling code associated with the target UE, the donor UE may forward the coded data packet to the target UE base on the RNTI scrambling code. Such early detection of data packets addressed to the target UE may allow for the UE to forward a data packet without fully decoding the packet.