Grant-Free Uplink Transmission With Feedback for Low-Latency 5G
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Solution Overview
Problem
5G communication systems face challenges in effectively managing data transmissions for various services with varying requirements, particularly in ensuring high reliability and low latency for ultra-reliable and low-latency communications (URLLC) while optimizing resource allocation and minimizing latency.
Innovation Solution
A method for controlling data transmissions using grant-free based data transmission, including semi-persistent scheduling (SPS) and UL grant type 2, which allows terminals to transmit data without separate control information, optimizing resource allocation and enabling efficient feedback reporting for multiple services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling is used for data transmission, then resource allocation flexibility is improved, but control signaling overhead increases and latency increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring grant-free resources and transmission parameters before data transmission is needed. The base station pre-allocates time-frequency resources, modulation schemes, and coding rates for multiple UEs, allowing them to transmit data immediately without waiting for dynamic scheduling grants, thus reducing latency while maintaining resource allocation flexibility.
Solution Approach 2:
The patent extracts the control signaling overhead from the data transmission process by implementing grant-free operation. UEs are taken out of the traditional scheduled transmission mode where they require explicit grants, and instead transmit data directly using pre-configured parameters, eliminating the need for real-time control signaling exchange.
2Loss of time
If grant-free data transmission is implemented, then latency is reduced and resource allocation is optimized, but reliability control becomes more difficult
Solution Approach 1:
The patent implements feedback mechanisms where UEs send acknowledgment (ACK) or negative acknowledgment (NACK) signals to the base station after receiving data or transmitting data successfully. This feedback loop allows the base station to monitor transmission reliability and initiate retransmissions when necessary, maintaining reliable communication despite the reduced control signaling in grant-free operation.
Solution Approach 2:
The patent applies beforehand cushioning by configuring multiple redundant transmission parameters and resources in advance. The base station pre-configures alternative modulation schemes, coding rates, and resource blocks that can be quickly activated if initial transmissions fail, providing a cushion against transmission failures without requiring complex real-time reliability control.
3Adaptability or versatility
If multiple services with varying requirements are supported, then system versatility is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies segmentation by dividing grant-free resources into separate pools for different service types (e.g., one pool for eMBB, another for URLLC). Each service type has dedicated pre-configured parameters and resources, allowing the system to support multiple services with varying requirements while keeping resource allocation management simpler through clear separation rather than complex unified allocation.
Data Source
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AI summary
A communication technique and a system thereof for converging an Internet of Things (IoT) technology and a 5th generation (5G) communication system for supporting a high data transmission rate beyond that of a 4th generation (4G) system are provided. The disclosure may be applied to intelligent services, such as smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail, and security and safety related services, on the basis of 5G communication technologies and IoT-related technologies. The disclosure provides a method and device for transmitting or receiving a plurality of dynamic scheduling-based and/or grant-free based data, and reporting feedback information relating to the plurality of data, in a wireless communication system.