Small Data Transmission Retransmission Configuration for Poor Coverage
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Solution Overview
Problem
In new radio (NR) systems, small data transmission methods face low reliability due to the lack of signaling exchange procedures, especially in areas with poor signal coverage, leading to potential data transmission failures.
Innovation Solution
A data transmission method for small data transmission (SDT) that involves obtaining configuration information, determining a target quantity of retransmissions, and performing retransmissions based on this information to ensure reliable data transfer, even in areas with poor signal coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If small data transmission is performed without signaling exchange procedure, then resource overhead is reduced and transmission is simplified, but transmission reliability deteriorates in areas with poor signal coverage
Solution Approach 1:
The network side device pre-configures retransmission parameters (maximum retransmission count, power adjustment values) and transmits them to the terminal before the actual data transmission occurs. This preliminary configuration enables the terminal to perform reliable retransmissions without requiring complex real-time signaling exchange, thus resolving the contradiction between simplified procedures and transmission reliability.
2Reliability
If retransmission mechanism is added to small data transmission, then transmission reliability is improved, but signaling overhead and procedure complexity increase
Solution Approach 1:
The terminal autonomously determines whether to perform retransmission by evaluating pre-configured parameters and transmission outcomes, without requiring the network side to intervene with additional signaling. The terminal uses pre-configured maximum retransmission counts and power adjustment values to independently control the retransmission process, thereby improving reliability while avoiding increased signaling overhead.
3Reliability
If multiple retransmissions are performed in small data transmission, then data transmission success rate is improved in poor coverage areas, but transmission time and energy consumption increase
Solution Approach 1:
The terminal dynamically adjusts transmission power for retransmissions based on pre-configured power adjustment values and actual transmission outcomes. By adaptively increasing power for retransmissions rather than using fixed power levels, the system improves the probability of successful transmission in poor coverage areas while minimizing unnecessary time consumption from repeated low-power transmission attempts.
Data Source
AI summary
A data transmission method for SDT includes a terminal obtains first configuration information, where the first configuration information includes at least one of a transmission resource or a transmission configuration parameter that are for SDT; the terminal determines, after an SDT procedure is triggered, a target quantity of times of retransmission; and the terminal performs retransmission based on the first configuration information and the target quantity of times of retransmission.