Reference Signal Mapping for 5G Low-Latency Demodulation
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Solution Overview
Problem
In LTE communications systems, the existing reference signal mapping methods occupy excessive time-frequency resources, leading to high overhead and inability to quickly demodulate data signals, which fails to meet the low-latency requirements of 5G mobile communication technologies.
Innovation Solution
The method involves mapping reference signals to specific time-frequency resources using orthogonal sequence groups, such as Walsh-Hadamard sequences, allowing for code division multiplexing and efficient use of resources by transmitting reference signals only when needed, thereby reducing the need for them to span the entire time-frequency resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reference signal is distributed in the whole physical resource block (PRB), then the reference signal can cover the entire time-frequency resource, but the reference signal occupies excessive time-frequency resources leading to high overhead
Solution Approach 1:
The patent segments the reference signal transmission by dividing the PRB into multiple time-frequency resource groups and selectively transmitting reference signals only in specific groups where data signals are actually present. This segmentation approach maintains adequate reference signal coverage for reliable demodulation while significantly reducing the total quantity of reference signal resources occupied, thereby resolving the contradiction between reliability and resource consumption.
2Reliability
If the reference signal is distributed in the whole physical resource block (PRB), then the reference signal provides comprehensive demodulation support, but the data signal cannot be quickly demodulated due to excessive overhead
Solution Approach 1:
The patent extracts and removes unnecessary reference signal transmissions from time-frequency resource groups where no data signals are transmitted. By taking out only the essential reference signals needed for actual data demodulation and eliminating redundant ones, the system maintains demodulation accuracy while reducing the time required for demodulation operations, thus resolving the contradiction between reliability and time loss.
3Ease of operation
If reference signals are transmitted throughout the entire time-frequency resource, then demodulation can be performed anywhere in the PRB, but the low-latency requirement of 5G cannot be satisfied
Solution Approach 1:
The patent applies local quality by making the reference signal transmission density and distribution adaptive to the actual data transmission patterns in different time-frequency resource groups. Instead of uniform reference signal distribution across the entire PRB, the system concentrates reference signals locally where data signals are present, maintaining demodulation flexibility in those specific regions while reducing overall latency through selective transmission, thereby resolving the contradiction between ease of operation and time loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables quick demodulation of control and data signals, satisfies the low-latency requirement of 5G networks, and increases the number of concurrent multiplexes on data and control channels, while also ensuring accurate and stable information transmission.
Implementation Method 1
The method involves mapping reference signals to specific time-frequency resources using orthogonal sequence groups, such as Walsh-Hadamard sequences, allowing for code division multiplexing and efficient use of resources
Data Source
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AI summary
The present disclosure pertains to the field of communications technologies and provides a reference signal mapping method and apparatus. The method includes: mapping, by a base station, N reference signals to a specified time-frequency resource; and transmitting, by the base station, a reference signal on the specified time-frequency resource to user equipment, where for any PRB, the specified time-frequency resource includes a first OFDM symbol in a data region in time domain; where the PRB includes a type-1 control channel and the data region, the data region includes a type-2 control channel and a data channel, the type-1 control channel includes first m OFDM symbols of the PRB in time domain, and the data region includes OFDM symbols other than the type-1 control channel in the PRB in time domain; and the type-2 control channel includes first n OFDM symbols in the data region in time domain, and the data channel includes OFDM symbols other than the type-2 control channel in the data region in time domain. In the present disclosure, a control signal and a data signal can be quickly demodulated, a low-latency requirement is satisfied, and a quantity of concurrent multiplex on the data channel and a quantity of user equipments multiplexed on the control channel are increased.