Sequence Mapping for Pilot-Free mMTC Data Transmission
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Solution Overview
Problem
In massive machine type communications (mMTC) scenarios, the challenge lies in efficiently transmitting small data packets from a large number of users, where existing methods face difficulties in access performance and data transmission efficiency due to the need for pilot signals and complex check bit calculations.
Innovation Solution
A data transmission method involving the use of a common sequence group to map first sub-sequences into second sub-sequences, eliminating the need for pilot signals and enabling efficient sensing compression, with optional check bits for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pilot signals are used for data transmission in mMTC scenarios, then transmission reliability is improved, but device complexity and processing delay increase
Solution Approach 1:
The patent extracts and eliminates the pilot signal from the transmission system. By using a novel sequence mapping method where data sequences are directly mapped to physical resources without requiring separate pilot signals, the system achieves reliable transmission while reducing processing complexity and delay.
Solution Approach 2:
The patent makes the data sequence itself serve multiple functions: it carries both the data information and acts as the reference signal for reception. This multi-functional approach eliminates the need for separate pilot signals while maintaining transmission reliability.
2Reliability
If check bit calculations are performed for data transmission, then transmission reliability is improved, but processing time and complexity increase
Solution Approach 1:
The patent performs sequence mapping and resource allocation calculations in advance during system configuration, rather than performing check bit calculations for every data packet transmission. This preliminary action reduces real-time processing time while maintaining reliability through the pre-established mapping relationships.
3Reliability
If conventional pilot-based transmission is used, then transmission reliability is maintained, but transmission efficiency decreases
Solution Approach 1:
The patent merges the data transmission function and the reference signal function into a single integrated sequence mapping process. By combining these functions, the system eliminates redundant pilot signals and check bit calculations, thereby improving transmission efficiency while maintaining reliability through the unified sequence design.
Data Source
AI summary
This application provides a data transmission method and an apparatus. In an example method, a first sequence and a common sequence group are obtained, where a quantity of sequences in the common sequence group is N; the first sequence includes K first sub-sequences, lengths of the K first sub-sequences are sequentially B1, B2, . . . , BK, K is a positive integer, B1=log2N, and the length B1 of a 1st first sub-sequence is greater than or equal to a length of another first sub-sequence. The K first sub-sequences are separately mapped into K second sub-sequences based on the common sequence group. A second sequence including the K second sub-sequences is output.