Data Transmission Method Using Redundancy Version Thresholds
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Solution Overview
Problem
Conventional HARQ mechanisms in LTE systems increase data transmission latency due to repeated transmissions upon incorrect reception, which is exacerbated by the need for scheduling information from the second device, hindering both reliability and latency in URLLC scenarios.
Innovation Solution
A method where a first device determines whether the transmission code rate exceeds a threshold, and if so, repeatedly transmits data within a set time unit based on a specific redundancy version, stopping transmission after a certain condition is met, such as receiving feedback indicating correct reception or reaching a threshold number of retransmissions, to optimize data transmission reliability and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional HARQ mechanism is used to ensure data transmission reliability through repeated transmissions, then data transmission reliability is improved, but data transmission latency is increased
Solution Approach 1:
The patent applies preliminary action by pre-configuring a set of redundancy versions and determining the data to be transmitted in advance. The first device determines, before transmission, which redundancy version to use based on the transmission code rate comparison with a threshold. This pre-determination eliminates the need for dynamic scheduling decisions during the transmission process, thereby reducing latency while maintaining reliability through appropriate redundancy selection.
Solution Approach 2:
The patent utilizes parameter changes by comparing the transmission code rate with a threshold parameter and selecting different redundancy versions based on this comparison. When the code rate exceeds the threshold, a specific redundancy version is chosen; otherwise, a different version is selected. This parameter-based decision mechanism optimizes the balance between transmission efficiency and reliability, resolving the contradiction by adapting the redundancy level to channel conditions.
2Ease of operation
If the first device waits for scheduling information from the second device before retransmitting data, then transmission coordination is improved, but data transmission latency is increased
Solution Approach 1:
The patent implements self-service by enabling the first device to autonomously determine whether retransmission is needed and which redundancy version to use, without waiting for scheduling information from the second device. The device compares the transmission code rate with a pre-configured threshold and independently selects the appropriate redundancy version from a set of predetermined versions. This self-service mechanism eliminates the scheduling delay while maintaining proper transmission coordination through the pre-configured redundancy version set.
3Reliability
If multiple redundancy versions are used for repeated transmission, then data reception reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the redundancy versions into a predetermined set with distinct characteristics. Each redundancy version in the set is designed to handle specific channel conditions, and the device segments the decision process into a simple threshold comparison. This segmentation approach maintains reliability by having multiple specialized versions available while reducing complexity through the structured, pre-configured nature of the version set and the simple comparison logic.
Data Source
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AI summary
Embodiments of this application disclose a data transmission method and a related device. The method includes: repeatedly transmitting, by a first device, first data to a second device within a first time unit set, where the first data is determined based on a first redundancy version and to-be-transmitted system bits, the first time unit set includes K time units, K≥3, and K is an integer; and when a first condition is met, stopping, by the first device, transmitting the first data in the Mth time unit, where 2≤M≤K, and M is an integer. In this way, during K times of repeated transmission of the system bits, data that is determined based on the system bits and that needs to be transmitted can be determined, and high reliability and a low latency of data transmission are ensured.