Cyclic Shift Randomization for ACK NACK Interference
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Solution Overview
Problem
In information transmission methods, serious delay spread leads to phase deviation and detection errors when multiple terminal devices send sequences over the same time-frequency resource, causing interference between ACK and NACK information sequences, which affects transmission performance.
Innovation Solution
The method involves generating candidate sequences based on dedicated cyclic shift values and an initial cyclic shift value, ensuring that sequences corresponding to the same candidate information differ, reducing interference by randomizing the cyclic shift value differences between different candidate information sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminal devices send sequences over the same time-frequency resource, then resource utilization is improved, but phase deviation and detection errors increase due to serious delay spread
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the cyclic shift values assigned to different terminal devices and candidate sequences. By changing the cyclic shift parameter, the system randomizes the phase relationships between sequences from different devices, which mitigates consistent interference patterns caused by delay spread while maintaining orthogonal resource allocation. This allows multiple devices to share time-frequency resources without suffering from systematic detection errors.
2Measurement precision
If cyclic shift values are used to differentiate sequences, then sequence differentiation is improved, but consistency interference between ACK and NACK sequences increases
Solution Approach 1:
The patent implements dynamics by making the cyclic shift values dynamic rather than static. Different cyclic shift values are assigned to the same candidate information (ACK or NACK) depending on the terminal device and transmission context. This dynamic assignment ensures that sequences from different devices have sufficient differentiation for accurate detection, while simultaneously preventing consistent interference between ACK and NACK sequences by varying their phase relationships across different transmissions and devices.
3Measurement precision
If dedicated cyclic shift values are assigned to each candidate sequence, then detection accuracy is improved, but system complexity increases
Solution Approach 1:
The patent manages complexity through parameter changes by using a systematic method to generate and assign cyclic shift values. Rather than requiring complex unique identifiers for each sequence, the system uses dedicated cyclic shift values that are derived from a manageable set of parameters including device-specific identifiers and candidate information types. This approach maintains high detection accuracy through dedicated assignment while controlling system complexity through parameterized generation.
Data Source
AI summary
The present disclosure provides an information transmission method, including: generating first information; determining a first sequence from N candidate sequences based on the first information; and sending the first sequence. The first information belongs to N candidate information. A mapping between the first information and the first sequence belongs to P mappings. Each of the P mappings includes a mapping between the N candidate information and the N candidate sequences. The N candidate sequences are generated based on N dedicated cyclic shift values and a first initial cyclic shift value. In at least two mappings, dedicated cyclic shift values used to generate candidate sequences corresponding to a same candidate information are different, where the same candidate information belongs to L candidate information in the N candidate information, both P and L are integers greater than 1, and the L is less than or equal to N.