Grant-Free Uplink Transmission with Redundancy Version Segmentation
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently configuring and managing uplink (UL) control channel transmission resources, particularly in supporting various services without separate UL scheduling information, which leads to delays in data transmission.
Innovation Solution
A method and apparatus for grant-free UL data transmission, where a terminal receives configuration information including the number of repetitive transmissions and period information, identifies resources for repetitive transmissions, and performs initial transmission based on a redundancy version (RV) value of 0, allowing for efficient UL data transmission without separate UL scheduling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate UL scheduling information is used for each UL transmission, then UL transmission can be controlled and managed, but transmission delays increase and efficiency decreases
Solution Approach 1:
The base station pre-configures multiple UL transmission resources and associated RV values for the terminal before actual data transmission occurs. The terminal stores this configuration information and can immediately transmit UL data using the pre-assigned resources without waiting for scheduling grants, thereby eliminating scheduling delays while maintaining controlled resource allocation
Solution Approach 2:
Multiple redundant UL transmission resources are pre-configured with different RV values to cushion against potential transmission failures. If initial transmission fails, the terminal can immediately use pre-configured retransmission resources without requiring additional scheduling information, ensuring continuous transmission capability and reducing overall transmission delay
2Speed
If grant-free UL transmission is implemented, then transmission delay is reduced, but resource allocation control becomes more complex
Solution Approach 1:
The UL transmission resources are segmented into multiple distinct resources, each associated with a specific RV value. This segmentation allows the terminal to quickly identify and use the appropriate resource based on transmission needs without complex real-time decisions, simplifying the terminal's operation while enabling efficient grant-free transmission
Solution Approach 2:
Different RV values are assigned to different pre-configured UL transmission resources. By changing the RV parameter across multiple pre-configured resources, the system provides diversity for retransmissions while maintaining a relatively simple configuration structure that the terminal can efficiently manage without complex real-time control
3Reliability
If multiple repetitive transmissions are configured, then transmission reliability is improved, but resource consumption increases
Solution Approach 1:
Instead of configuring a large number of repetitive transmissions, the system uses a limited set of pre-configured resources with different RV values. The terminal only activates the necessary number of transmissions based on actual channel conditions and acknowledgment feedback, avoiding excessive resource consumption while maintaining sufficient reliability through selective use of pre-configured redundant resources
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure relates to a method and apparatus for transmitting uplink (UL) data in a wireless communication system. A method includes receiving configuration information for a grant-free UL transmission, the configuration information including information on a number of repetitive transmissions and period information; identifying resources for repetitive transmissions in a period based on the configuration information; identifying a resource for an initial transmission of the UL data based on a value of a redundancy version (RV) associated with the resource, wherein the resource for the initial transmission of the UL data is associated with an RV value 0; and performing the initial transmission of the UL data on the identified resource.