5G Uplink Multiplexing via Shared Grant-Free Transmission
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Solution Overview
Problem
In 5G NR networks, Ultra-Reliable and Low Latency Communications (URLLC) require high-reliability and low-latency transmissions, which often interrupt or preempt Enhanced Mobile Broadband (eMBB) transmissions, leading to inefficient resource utilization and increased error rates due to puncturing of eMBB data.
Innovation Solution
The implementation of non-orthogonal multiple access (NOMA) encoding and Multi-User Detection (MUD) techniques allows both UEs to transmit data using shared grant-free resources, reducing error rates and enhancing resource efficiency by using power division multiplexing instead of rescheduling eMBB transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If URLLC transmission preempts eMBB resource, then URLLC reliability and latency are improved, but eMBB error rate increases and resource utilization efficiency deteriorates
Solution Approach 1:
The eMBB codeword is segmented into multiple code blocks, with each code block independently encoded and transmitted. This segmentation allows the eMBB transmission to be divided into smaller units that can be individually handled during preemption, reducing the impact on overall eMBB reliability while maintaining URLLC performance.
Solution Approach 2:
The system performs preliminary rate matching and code block segmentation before the actual transmission occurs. By pre-processing the eMBB data into multiple code blocks and determining their transmission parameters in advance, the system can quickly respond to URLLC preemption requests without compromising eMBB error rates, as the segmentation structure is already in place.
2Loss of time
If eMBB transmission is punctured by URLLC, then URLLC low latency is achieved, but resource utilization efficiency deteriorates
Solution Approach 1:
The system dynamically adjusts the allocation and transmission of code blocks based on real-time preemption indicators. When URLLC preemption occurs, the eMBB transmission is dynamically modified by transmitting only the necessary code blocks in the available resources, while maintaining the overall resource utilization efficiency through adaptive rate matching and code block selection.
3Reliability
If separate resources are allocated for URLLC and eMBB, then transmission reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The system merges URLLC and eMBB transmissions by allowing URLLC to preempt eMBB resources dynamically. Instead of allocating completely separate resources, the system combines the resource pools and uses preemption indicators to manage conflicts, thereby improving resource utilization efficiency while maintaining the reliability requirements of both services through independent code block handling and rate matching.
Data Source
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AI summary
This document describes methods, devices, systems, and means for fifth generation new radio uplink multiplexing assisted by shared grant-free transmission. A user equipment (UE) (111) inserts a first cyclical redundancy check (CRC) (504) into a transport block (TB) (502), encodes the TB (502), including the CRC (504), into a codeword (CW). Based on receiving a preemption indicator for part of a first physical resource (616), the UE (111) selects a first part of the CW for rate matching with a length based on a received uplink (UL) grant and the received preemption indicator. The UE (111) transmits the first part of the CW using the first physical resource (616), selects a second part of the CW, inserts a second CRC in the selected second part of the CW, and transmits the second part of the CW using a second physical resource (634).