CoMP Cluster Set Determination for URLLC Reliability and Delay
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Solution Overview
Problem
Conventional cluster set determination solutions in wireless communications systems fail to provide a desired level of speed and customization for ultra-reliable low-latency communications (URLLC) by not adequately accounting for delay budgets and reliability requirements of user equipment (UE).
Innovation Solution
A method for determining a CoMP cluster set of transmit/receive points (TRPs) based on a UE's delay budget and reliability requirement, using configuration information and measurements, and adjusting the cluster set based on the number of allowed re-transmissions to meet these requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cluster set determination solutions are used, then device complexity is reduced, but reliability and speed for URLLC are insufficient
Solution Approach 1:
The patent changes the parameters used for cluster set determination from conventional metrics to ones that specifically account for delay budget and reliability requirement. The network entity determines the cluster set by evaluating multiple parameters including delay budget, reliability requirement, number of allowed re-transmissions, configuration information, and measurements, thereby achieving URLLC-level reliability through parameter optimization.
Solution Approach 2:
The cluster set determination is made dynamic by allowing adjustment based on varying delay budgets and reliability requirements. The network entity can adjust the cluster set configuration based on the number of allowed subsequent re-transmissions and changing channel conditions, enabling the system to adapt to different URLLC service requirements in real-time.
2Speed
If conventional cluster set determination solutions are used, then ease of operation is maintained, but speed for URLLC is insufficient
Solution Approach 1:
The network entity performs preliminary determination of the cluster set based on delay budget and reliability requirement before actual URLLC data transmission. Configuration information and measurements are collected and processed in advance to establish the optimal cluster set, enabling fast response when URLLC traffic arrives without requiring complex real-time decisions during transmission.
Solution Approach 2:
The system incorporates feedback mechanisms where the network entity adjusts the cluster set based on the number of allowed subsequent re-transmissions and channel measurements. This feedback loop enables the system to optimize cluster set configuration dynamically, improving speed by learning from past transmission outcomes and adapting to changing conditions.
3Reliability
If cluster set is optimized for reliability, then reliability requirement is met, but delay budget may be exceeded
Solution Approach 1:
The cluster set configuration is made dynamic by allowing adjustment based on the number of allowed subsequent re-transmissions. When delay budget is tight, the system can reduce cluster set size or adjust configuration to enable faster transmission, while still meeting reliability requirements through coordinated multi-point operation. This dynamic adjustment prevents excessive delay while maintaining reliability.
Solution Approach 2:
The system changes multiple parameters simultaneously including cluster set size, number of allowed re-transmissions, and configuration information to balance reliability and delay budget. By optimizing the combination of these parameters rather than focusing solely on cluster set size, the system achieves reliability requirements without unnecessarily increasing delay.
Data Source
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AI summary
Various aspects described herein relate to techniques for communications in a coordinated multi-point (CoMP) wireless communications system. In an aspect, a method of wireless communications may include receiving a request to form a CoMP cluster set of transmit/receive points (TRPs) for a user equipment (UE), determine the CoMP cluster set of TRPs for the UE based on at least a delay budget and a reliability requirement, and one or more of configuration information and measurements, and coordinate communications for the UE using the CoMP cluster set. The techniques described herein may apply to different communications technologies, including 5th Generation (5G) New Radio (NR) communications technology.