HARQ Codebook Generation for Mixed Transmission Time Units
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Solution Overview
Problem
In carrier aggregation scenarios, especially in 5G technology, the difference in transmission time unit lengths between component carriers leads to incorrect HARQ codebook generation, affecting data transmission between access network devices and terminals.
Innovation Solution
A method for generating a HARQ codebook that accounts for varying transmission time unit lengths by using HARQ timing and feedback information from both primary and secondary carriers, allowing the terminal to correctly generate the codebook and ensure uninterrupted data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier aggregation is used to meet different service type requirements, then service adaptability is improved, but HARQ codebook generation accuracy deteriorates when transmission time units differ
Solution Approach 1:
The patent applies dynamics by making the HARQ codebook generation process adaptive to different transmission time unit configurations. The terminal device dynamically adjusts the codebook generation based on whether the first and second transmission time units have the same or different lengths, allowing the system to maintain accuracy across varying carrier aggregation scenarios while preserving service adaptability
Solution Approach 2:
The patent changes the parameter of transmission time unit length comparison as the basis for HARQ codebook generation. By detecting whether the first transmission time unit length equals the second transmission time unit length, and adjusting the codebook generation accordingly, the system resolves the contradiction between maintaining service adaptability and ensuring codebook generation accuracy under different carrier aggregation configurations
2Ease of manufacture
If HARQ codebook is generated based on same transmission time unit setting, then generation simplicity is improved, but transmission reliability deteriorates when carriers have different time unit lengths
Solution Approach 1:
The patent applies preliminary action by having the terminal device detect and compare the lengths of the first and second transmission time units before generating the HARQ codebook. This preliminary detection step ensures that the codebook generation is based on accurate timing information, thereby maintaining data transmission reliability while keeping the overall process relatively simple through standardized procedures
3Adaptability or versatility
If different transmission time unit lengths are used for aggregated carriers, then service flexibility is improved, but HARQ feedback accuracy deteriorates
Solution Approach 1:
The patent changes the approach to HARQ feedback by using the detected transmission time unit length comparison as a key parameter. When the first and second transmission time unit lengths are different, the terminal adjusts the codebook generation process accordingly, ensuring that HARQ feedback accuracy is maintained despite the use of different transmission time unit lengths for service flexibility
Data Source
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AI summary
This application provides a HARQ codebook generation method and a related device, so that when there are carriers having different transmission time unit lengths in component carriers in carrier aggregation, a HARQ codebook can be correctly generated, and data transmission between an access network device and a terminal is not affected. The method in embodiments of the present invention includes: receiving, by a terminal, first information sent by an access network device, where the first information is used to indicate, to the terminal, carriers configured by the access network device for the terminal, the configured carriers include a first carrier and a second carrier, HARQ feedback information of the first carrier and HARQ feedback information of the second carrier are transmitted on an uplink control channel of the first carrier, and a transmission time unit length of the first carrier is not equal to a transmission time unit length of the second carrier; and generating, by the terminal based on HARQ timing of the configured carriers and a relationship between the transmission time unit length of the first carrier and the transmission time unit length of the second carrier, a HARQ codebook transmitted on the uplink control channel of the first carrier.