HARQ Modulation Symbols for Multi-User Frequency Domain Multiplexing
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Solution Overview
Problem
In existing LTE systems, the method for transmitting HARQ information on a PUSCH channel is not applicable when multiple users multiplex a frequency domain resource, leading to overlapping of HARQ information and incorrect decoding by the base station.
Innovation Solution
The method involves modulating encoded HARQ information using a codebook to generate HARQ modulation symbols, which include both non-zero and zero symbols, and mapping these symbols to specific resource elements, ensuring correct decoding by the network device even when multiple users share the same time-frequency resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ information is transmitted using the existing LTE method on PUSCH channel, then the transmission is simple and compatible with single-user systems, but HARQ information from multiple users overlaps and cannot be decoded correctly in multi-user frequency-domain multiplexing systems
Solution Approach 1:
The patent segments the HARQ information transmission by assigning dedicated resource elements (REs) to each user for transmitting their HARQ feedback. Instead of multiplexing all users' HARQ information in the same frequency band, each user is allocated specific REs, which divides the transmission space and prevents overlap between different users' HARQ information, enabling correct decoding at the base station.
Solution Approach 2:
The patent introduces resource element (RE) allocation as an intermediary mechanism between the user and the transmission channel. By using RE allocation, the system mediates the conflict between multiple users sharing frequency domain resources, ensuring that each user's HARQ information is transmitted on designated REs without interference from other users, thus solving the overlapping problem.
2Productivity
If multiple users multiplex frequency domain resources, then resource utilization is improved, but HARQ information transmission reliability deteriorates due to overlapping and incorrect decoding
Solution Approach 1:
The patent segments the frequency domain resources by assigning dedicated resource elements to each user for HARQ feedback transmission. This segmentation ensures that even though multiple users share the frequency band for data transmission, each user has exclusive REs for their HARQ information, preventing overlap and ensuring reliable decoding while maintaining the productivity benefits of frequency domain multiplexing.
Solution Approach 2:
The patent applies local quality by providing each user with specific, dedicated resource elements for HARQ transmission. Instead of uniform resource allocation, the system assigns localized REs to each user based on their identification information, ensuring that each user's HARQ feedback is transmitted with optimal local resources without interference from other users, thus maintaining reliability in a multi-user environment.
Data Source
AI summary
An information transmission method includes: modulating, by a terminal device, encoded hybrid automatic repeat request (HARQ) information according to a codebook, to generate HARQ modulation symbols, where the HARQ modulation symbols include at least one non-zero HARQ modulation symbol and at least one zero HARQ modulation symbol, the codebook includes at least two code words, the code words are multi-dimensional complex vectors, and the code words are used to indicate a mapping relationship between a bit and at least two modulation symbols; and sending the HARQ modulation symbols to a network device.