Configured Grant Uplink Control for Low-Latency URLLC
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Solution Overview
Problem
Future wireless communications networks face challenges in efficiently supporting a diverse range of devices with varying data traffic profiles and requirements, particularly in handling Ultra Reliable Low Latency Communications (URLLC) services that demand high reliability and low latency, as existing technologies like Configured Grant (CG) PUSCH operations in NR-U introduce latency and reliability issues.
Innovation Solution
The method involves operating a communications device in a configured grant (CG) mode, transmitting uplink data and control information (CG-UCI) to support URLLC services, using enhanced CG-PUSCH configurations such as multi-CG-PUSCH, e-Type B PUSCH repetition, and intra-UE prioritization to minimize latency and ensure reliability, while optimizing radio resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Configured Grant (CG) PUSCH operations are used in NR-U, then device complexity is reduced and ease of operation is improved, but latency increases and reliability deteriorates
Solution Approach 1:
The patent applies dynamics by enabling dynamic prioritization of URLLC traffic over eMBB traffic within the same CG-PUSCH configuration. The network can dynamically switch between different transmission modes (URLLC mode and eMBB mode) based on real-time traffic conditions, allowing the system to adapt to changing requirements and maintain both ease of operation and reliability.
Solution Approach 2:
The patent changes key parameters including introducing a priority indicator in DCI messages, modifying HARQ-ACK feedback mechanisms, and adjusting transmission parameters based on traffic type. These parameter changes enable the system to distinguish between URLLC and eMBB traffic and apply appropriate handling mechanisms while maintaining the simplified CG-PUSCH operation.
2Ease of operation
If Configured Grant (CG) PUSCH operations are used in NR-U, then device complexity is reduced and ease of operation is improved, but latency increases
Solution Approach 1:
The system dynamically adapts the CG-PUSCH operation mode based on traffic characteristics. When URLLC traffic is detected, the system switches to URLLC mode with optimized parameters (shorter feedback delays, higher priority scheduling), while maintaining eMBB mode for normal operations. This dynamic adaptation reduces latency for urgent traffic without compromising the simplicity of the overall system operation.
Solution Approach 2:
The patent implements preliminary actions by pre-configuring multiple CG-PUSCH configurations with different parameters for URLLC and eMBB traffic types. The network can quickly switch between pre-configured modes when traffic conditions change, avoiding the need for complex real-time reconfiguration and thus reducing latency while maintaining operational simplicity.
3Device complexity
If existing CG-PUSCH configurations are used, then device complexity is minimized, but the ability to support diverse traffic profiles deteriorates
Solution Approach 1:
The patent makes the CG-PUSCH configuration universal by enabling it to support multiple traffic profiles (URLLC and eMBB) within the same basic configuration framework. The network can configure a single CG-PUSCH and dynamically adapt it to handle different traffic types through priority indicators and mode switching, eliminating the need for separate configurations for each traffic type while maintaining device simplicity.
Solution Approach 2:
The system dynamically adapts the CG-PUSCH configuration to match current traffic requirements. By introducing dynamic prioritization mechanisms and mode switching capabilities, the same CG-PUSCH configuration can adapt to support both URLLC and eMBB traffic profiles, enhancing versatility without increasing device complexity.
Data Source
AI summary
A method of operating a communications device configured to transmit data via a wireless access interface is provided. The method comprises operating in accordance with a configured grant, CG, mode of operation comprising determining a sequence of instances of uplink communications resources of the wireless access interface and transmitting uplink data to the wireless communications network in at least one instance of the sequence of instances of uplink communications resources, transmitting, to the wireless communications network, uplink control information relating to the CG mode of operation, CG-UCI, comprising one or more indicators which indicate information required to support one or more of a plurality of services, the plurality of services including Ultra Reliable Low Latency Communications, URLLC, and transmitting the uplink data in accordance with the information required to support the one or more of the plurality of services indicated by the one or more indicators of the transmitted CG-UCI.