Sequence Sending With Parameter-Based Scrambling for mMTC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In cellular network mobile communication systems, particularly in mMTC scenarios with a large number of terminals, sequence conflicts occur frequently due to limited available sequences, leading to detection failures by the base station, which affects uplink data transmission efficiency.
Innovation Solution
A terminal device sends multiple sequences in different time periods, each generated through scrambling processing based on specific parameters, increasing the total number of available sequence combinations, thereby reducing the likelihood of conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the quantity of available sequences is fixed, then the system complexity is reduced, but the probability of sequence conflict increases when there are many terminals
Solution Approach 1:
The patent segments the sequence resource pool into multiple groups, where each group contains sequences with different parameters (such as different root indices, cyclic shifts, or lengths). Terminals can select sequences from different groups, effectively increasing the total number of available sequences without requiring a single large resource pool. This segmentation approach reduces sequence conflict probability while maintaining manageable system complexity.
Solution Approach 2:
The patent introduces additional dimensions to the sequence selection space by utilizing multiple sequence parameters (root index, cyclic shift, length, etc.). Instead of simply increasing the number of sequences in one dimension, the patent creates a multi-dimensional sequence resource space, allowing terminals to differentiate sequences across multiple parameters. This exponentially increases the number of available sequence combinations without linearly increasing system complexity.
2Reliability
If multiple sequences are sent in different time periods, then the number of available sequence combinations increases, but the transmission time increases
Solution Approach 1:
The patent employs periodic transmission of sequences across different time periods, where each time period contains a subset of the total sequence resource pool. By distributing sequence transmissions periodically across multiple time slots, the system increases the effective number of available sequences while spreading the transmission time burden. Terminals can complete their random access using sequences from different periods, reducing conflict probability without requiring all sequences to be transmitted simultaneously.
3Reliability
If scrambling processing is performed on sequences, then the sequence diversity is increased, but the processing complexity increases
Solution Approach 1:
The patent utilizes parameter changes in scrambling sequences to increase sequence diversity. By varying scrambling parameters (such as initialization values, step sizes, or polynomial coefficients) based on terminal-specific information or time-varying factors, the system generates diverse scrambled sequences from a limited set of base sequences. This approach significantly increases the effective number of available sequences while keeping the processing complexity manageable, as the same scrambling algorithm is reused with different parameters.
Data Source
AI summary
A sequence sending method and an apparatus, to reduce a probability of a sequence conflict. The method includes: a terminal device sends, in a first time period, a first sequence to a network device, where the first sequence is determined based on a first parameter; the terminal device performs scrambling processing on a second sequence based on the first parameter, to generate a scrambled second sequence; the terminal device sends, in a second time period, the scrambled second sequence to the network device; the terminal device performs scrambling processing on an Nth sequence based on an (N−1)th parameter, to generate a scrambled Nth sequence, where an (N−1)th sequence is determined based on the (N−1)th parameter, and N is an integer greater than 2; and the terminal device sends, in an Nth time period, the scrambled Nth sequence to the network device.