Control Channel Candidates with Time Overlap for URLLC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mobile telecommunications systems, particularly 5G NR, face challenges in achieving low latency and high reliability for Ultra Reliable & Low Latency Communications (URLLC) due to limitations in control channel transmission efficiency, especially in pre-empting resources from existing Enhanced Mobile Broadband (eMBB) transmissions.
Innovation Solution
The implementation of control channel candidates at different repetition levels, where at least one control channel candidate overlaps in time with another of the same repetition level, allows for improved scheduling efficiency and resource pre-emption, reducing latency and increasing reliability by enabling faster transmission of URLLC packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channels are transmitted with traditional single repetition, then device complexity is reduced, but reliability and latency performance for URLLC deteriorate
Solution Approach 1:
The control channel transmission is segmented into multiple repetition levels (first repetition level and second repetition level) with different numbers of repetitions. This allows the system to provide both high reliability (through multiple repetitions) and low complexity (through selective repetition) for different service types.
Solution Approach 2:
The system dynamically selects between different repetition levels based on service requirements. URLLC services can use higher repetition levels for reliability, while eMBB services can use lower repetition levels for efficiency, making the system adaptive and flexible.
2Loss of time
If control channel candidates are transmitted sequentially without time overlap, then scheduling is simplified, but latency for URLLC increases
Solution Approach 1:
Control channel candidates are prepared and scheduled in advance with overlapping time structures. This preliminary arrangement allows URLLC transmissions to start earlier without waiting for complete sequential transmission of all candidates, reducing latency.
Solution Approach 2:
The patent introduces time overlap between control channel candidates of the same repetition level, adding a dimensional aspect to the scheduling structure. This allows multiple candidates to be transmitted simultaneously in time, improving latency performance.
3Adaptability or versatility
If control channels use fixed repetition levels, then implementation is simplified, but adaptability to different service requirements deteriorates
Solution Approach 1:
Different repetition levels are applied to different control channel candidates based on their specific service requirements. This local differentiation allows the system to optimize each candidate's repetition level individually, improving adaptability while maintaining manageable complexity through structured configuration.
Data Source
AI summary
A base station for a mobile telecommunications system has circuitry configured to communicate with at least one user equipment, wherein the circuitry is further configured to: provide, to the at least one user equipment, control channel candidates at different repetition levels, wherein at least a first control channel candidate of a repetition level overlaps in time with at least a second control channel candidate of the same repetition level.