Uplink Channel Estimation via Non-Overlapping Reference Signal Transmission
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Solution Overview
Problem
In deep-coverage wireless communication scenarios, the uplink channel estimation performance of network devices is poor due to low transmit power and fixed ratios of DMRS to PUSCH in new radio systems, leading to incorrect reception of uplink signals from terminal devices.
Innovation Solution
A method where a terminal device determines non-overlapping first and second transmission time periods to send a reference signal and an uplink signal, respectively, allowing for improved channel estimation by the network device, with the possibility of alternating time unit distribution and frequency hopping to enhance interpolation and precision in time-varying channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS and PUSCH are always sent together with a fixed ratio of OFDM symbols, then the transmission structure is simple and easy to implement, but the uplink channel estimation performance is poor in deep-coverage scenarios
Solution Approach 1:
The patent applies dynamics by making the transmission structure flexible and adjustable rather than fixed. The network device can dynamically configure different time unit ratios (X1:X2) for reference signal and uplink signal transmission based on channel conditions, terminal device mobility, and coverage requirements. This dynamic configuration allows the system to adapt to varying channel estimation needs while maintaining implementation feasibility through standardized configuration mechanisms.
Solution Approach 2:
The patent changes the parameter of time unit allocation ratio between reference signal transmission (X1) and uplink signal transmission (X2). By adjusting this parameter, the system can optimize channel estimation performance in deep-coverage scenarios by allocating more time units to reference signals when needed, while still maintaining a structured and manageable transmission framework through protocol-defined configuration options.
2Adaptability or versatility
If the ratio of time units for reference signal to uplink signal is fixed, then the configuration is simple, but the system cannot adapt to high-speed terminal devices and rapidly changing channels
Solution Approach 1:
The patent implements dynamics by enabling flexible configuration of the time unit ratio (X1:X2) between reference signal and uplink signal transmission. The network device can adjust this ratio based on terminal device mobility status and channel variation characteristics, allowing the system to adapt to high-speed scenarios and rapidly changing channels while maintaining manageable complexity through standardized configuration procedures.
Solution Approach 2:
The patent segments the transmission time into two distinct parts: X1 time units for reference signal transmission and X2 time units for uplink signal transmission. This segmentation allows independent optimization of each segment's duration and timing, enabling the system to adapt to different channel conditions and terminal mobilities while maintaining clear structural organization and implementation simplicity.
3Measurement precision
If reference signal and uplink signal are transmitted in overlapping time periods, then the transmission efficiency is high, but the network device cannot accurately separate and process the signals for channel estimation
Solution Approach 1:
The patent segments the transmission timeline into non-overlapping time periods: X1 time units dedicated to reference signal transmission and X2 time units dedicated to uplink signal transmission. This temporal segmentation allows the network device to accurately separate and process the signals for channel estimation without interference, while the efficient packing of these segments minimizes idle time and maintains high transmission efficiency.
Data Source
AI summary
A communication method and apparatus are provided. A terminal device determines a first transmission time period and a second transmission time period, where the first transmission time period includes X1 time units, the second transmission time period includes X2 time units, and the first transmission time period does not overlap the second transmission time period. The terminal device sends a first reference signal in the first transmission time period and a first uplink signal in the second transmission time period, where the first uplink signal includes at least one of a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a demodulation reference signal (DMRS). Therefore, the terminal device may additionally send the first reference signal, to improve uplink channel estimation performance of a network device. This improves coverage performance of a communication system.