Wireless Retransmission Scheduling for URLLC and eMBB Collisions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting both high-capacity eMBB and low-latency URLLC transmissions, as current multiplexing methods lead to resource inefficiencies and increased latency in eMBB transmissions due to collisions with URLLC data.
Innovation Solution
Implementing a method where only the corrupted portion of eMBB data is retransmitted, rather than the entire data, using techniques such as HARQ retransmission with symbol combining and resource allocation adjustments to optimize resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If URLLC transmissions are prioritized to meet low latency requirements, then URLLC latency performance is improved, but eMBB transmission efficiency deteriorates due to resource collisions and retransmissions
Solution Approach 1:
The patent segments the eMBB transport block into multiple codeblock groups and identifies specifically which groups are corrupted by URLLC transmissions. Instead of retransmitting the entire eMBB data, only the affected codeblock groups are marked for retransmission, thereby reducing the retransmission overhead and improving overall system productivity while maintaining URLLC low latency requirements.
Solution Approach 2:
The patent applies local quality by differentiating between corrupted and non-corrupted codeblock groups within the eMBB transmission. The system identifies the specific location and extent of URLLC-induced corruption and applies retransmission only to the affected local segments (codeblock groups), rather than treating the entire transmission uniformly. This localized approach minimizes resource waste and maintains high eMBB efficiency.
2Reliability
If entire eMBB data is retransmitted upon collision with URLLC, then transmission reliability is improved, but resource efficiency deteriorates
Solution Approach 1:
The patent divides the eMBB transport block into multiple codeblock groups and identifies specifically which groups were corrupted by URLLC transmissions. By segmenting the retransmission requirement to only the affected codeblock groups rather than the entire eMBB data, the system maintains transmission reliability for the corrupted portions while significantly reducing network resource consumption compared to full retransmission.
Solution Approach 2:
The patent implements partial action by retransmitting only the necessary subset of eMBB data (corrupted codeblock groups) rather than the complete eMBB transport block. This partial retransmission approach provides sufficient reliability correction for the damaged portions while avoiding the excessive resource consumption that would result from retransmitting uncorrupted data segments.
3Productivity
If long scheduling time is used for eMBB transmissions, then system capacity is improved, but latency increases making it unsuitable for URLLC
Solution Approach 1:
The patent implements dynamic scheduling by allowing the system to adapt the scheduling time based on the service type. For eMBB services, long scheduling times are used to maximize system capacity and spectral efficiency. For URLLC services, the system dynamically switches to short scheduling times to meet low latency requirements. The hybrid approach enables the system to optimize for capacity when serving eMBB while maintaining the ability to rapidly respond to URLLC demands.
Solution Approach 2:
The patent creates a universal scheduling framework that can serve both eMBB and URLLC requirements within the same system. The multi-functionality is achieved by implementing a hybrid scheduling mechanism that can operate in both long scheduling time mode (for eMBB capacity optimization) and short scheduling time mode (for URLLC latency optimization), allowing the system to adapt its behavior based on the specific service requirements.
Data Source
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AI summary
A retransmission method for use in a telecommunications system, the method comprising: transmitting, to a terminal, first data in a set of identified resources allocated for the transmission of the first data; identifying that a portion of the identified resources has been used to transmit data other than the first data; and retransmitting a subset of the first data, the subset of the first data comprising the portion of the first data that was previously scheduled to be transmitted in the portion of the identified resources