Reed-Muller Reference Signal Padding for Massive Machine-Type Communication
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Solution Overview
Problem
The existing New Radio (NR) protocols face limitations in the number of demodulation reference signals, leading to insufficient network capacity and inaccurate user detection in massive machine-type communication scenarios due to the insufficiency of available reference signals.
Innovation Solution
A wireless communication method that utilizes Reed-Muller sequences, padding or truncating them to match the reference signal length, ensuring robust detection performance by providing a large-capacity reference signal for channel estimation and user identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional reference signal methods are used in NR protocols, then the system structure is simple, but the network capacity is insufficient due to limited number of reference signals
Solution Approach 1:
The patent changes the parameters of reference signals by using Reed-Muller sequences with variable order m to generate a large number of reference signals. By adjusting the sequence length and using different initialization values, the system can support massive number of reference signals while maintaining manageable complexity through parameterized sequence generation.
Solution Approach 2:
The patent segments the reference signal generation process into multiple independent components: Reed-Muller sequence generation, scrambling with different initialization values, and mapping to physical resources. This segmentation allows each component to be optimized independently, enabling large-scale reference signal support without proportionally increasing overall system complexity.
2Quantity of substance
If more reference signals are allocated to support massive machine-type communication, then the network capacity increases, but the signaling overhead increases
Solution Approach 1:
The patent makes the reference signal generation process universal by using a single Reed-Muller sequence framework that can generate all required reference signals through parameter variation (different orders m, different initialization values). This eliminates the need for separate signaling for each reference signal configuration, as the generation rules are standardized and implicitly understood by both transmitter and receiver.
Solution Approach 2:
Instead of transmitting separate configuration information for each reference signal, the patent uses copying through scrambling: a base Reed-Muller sequence is copied and scrambled with different initialization values to generate multiple reference signals. The scrambling initialization values are derived from user-specific parameters, eliminating the need for explicit signaling of each reference signal's full configuration.
3Measurement precision
If conventional detection methods are used, then the detection complexity is low, but the detection accuracy is insufficient for massive connection scenarios
Solution Approach 1:
The patent improves detection accuracy by using Reed-Muller sequences with optimized parameters (order m, length 2^m) that provide better autocorrelation and cross-correlation properties. These parameter-optimized sequences enable more accurate user detection and channel estimation even in massive connection scenarios, while the detection complexity remains manageable due to the structured nature of Reed-Muller sequences.
4Loss of time
If grant free access is implemented for massive machine-type communication, then the access latency is reduced, but the user identification becomes difficult due to limited reference signals
Solution Approach 1:
The patent prepares a large pool of pre-defined Reed-Muller sequences with different orders and initialization values before the grant-free access process. This preliminary preparation ensures that when users need to access the network, sufficient reference signals are already available for immediate use, enabling low-latency access without the need for real-time reference signal allocation or negotiation.
Data Source
AI summary
A wireless communication method and apparatus. The method includes a terminal obtains a first sequence, and pads or truncates the first sequence to determine a second sequence having a reference signal length; the terminal outputs the second sequence to a network device; the network device receives the second sequence output by the terminal; the network device obtains, based on the second sequence, a third sequence of which a length is a first sequence length 2m; and based on the third sequence, the network device identifies active users and/or performs channel estimation. In the above technical solution, the terminal obtains the second sequence having the reference signal length by padding or truncating the obtained first sequence. The second sequence is output and used for identification of active users and/or channel estimation.