RM Sequence Transmission for Grant-Free mMTC Detection
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Solution Overview
Problem
In the context of New Radio Access Technology (NR), the existing NR protocol has a limited capacity for reference signals, which is a bottleneck in massive Machine Type Communication (mMTC) scenarios due to the high number of users, leading to significant signaling overheads and detection complexity.
Innovation Solution
A data transmission method that dynamically determines a codebook set for each sub-block using Reed Muller (RM) sequences, generated by a P matrix and a b vector, reducing storage overheads and improving detection reliability by establishing a cascading constraint relationship between sub-blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a fixed RM codebook set is stored to provide a large quantity of reference signals, then the quantity of reference signals is increased, but the storage overheads of the communication apparatus are high
Solution Approach 1:
The patent transitions from a static fixed codebook set to a dynamic generation approach where RM sequences are generated on-demand using P matrices and b vectors. The network device dynamically determines which P matrix and b vector to use based on the specific transmission scenario, allowing the system to adapt the reference signal generation process to different conditions rather than storing all possible sequences
Solution Approach 2:
The patent introduces a new dimensional approach by using mathematical parameters (P matrices and b vectors) to generate reference signals. Instead of storing sequences in a traditional codebook, the system uses a parametric representation where combinations of P matrices and b vectors define the RM sequences, effectively moving from a storage-based approach to a computation-based approach with reduced storage requirements
2Quantity of substance
If grant free access system is designed to handle large quantity of users, then the network capacity is improved, but the signaling overheads are very high
Solution Approach 1:
The patent changes the parameters used for user identification from traditional grant-based resource allocation to RM sequence parameters (P matrix index and b vector). By using RM sequences with different parameters to represent different users, the system can support a large number of users in grant-free access without requiring extensive signaling for resource allocation and user identification
3Quantity of substance
If the quantity of reference signals is increased to support more users, then the network capacity is improved, but the detection complexity is increased
Solution Approach 1:
The patent segments the reference signal space by dividing it into multiple codebooks, where each codebook is associated with a specific P matrix. This segmentation allows the detection process to be broken down into two stages: first identifying the P matrix (codebook selection), then identifying the specific sequence within that codebook using the b vector. This hierarchical segmentation reduces the overall detection complexity compared to searching through a single large codebook
Data Source
AI summary
A data transmission method and apparatus are disclosed. The method includes a first communication apparatus obtains information bit information of an ith sub-block, where the information bit information of the ith sub-block includes information bits of the ith sub-block and an information bit length of the ith sub-block, and i is a positive integer; obtains a matrix order M of the RM corresponding to the first communication apparatus in the ith sub-block, where M is a positive integer; then obtains, based on M, a first P matrix and a first b vector that are used to generate an RM; then generates, based on the first P matrix and the first b vector, the RM sequence corresponding to the ith sub-block; and finally, outputs the RM sequence corresponding to the ith sub-block.