Reference Signal Transmission for Downlink Channel Acquisition
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Solution Overview
Problem
In frequency division duplex (FDD) communication systems, network devices face challenges in obtaining downlink channel state information due to the lack of reciprocity between uplink and downlink channels, which hinders efficient data transmission and scheduling.
Innovation Solution
A communication method where a terminal device determines and sends a reference signal carrying downlink channel information to a network device, allowing the network device to quickly obtain downlink channel information, potentially using pre-defined or dynamically determined parameters for optimal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network device uses uplink channel state information to obtain downlink channel information, then the system can operate efficiently, but this approach is only valid for TDD systems and cannot be applied to FDD systems due to lack of channel reciprocity
Solution Approach 1:
The patent introduces a reference signal as an intermediary carrier that transports downlink channel information from the terminal device to the network device. This reference signal acts as a mediator, enabling the network device to obtain downlink channel state information in FDD systems where direct reciprocity between uplink and downlink channels does not exist, thus resolving the contradiction between acquisition efficiency and system adaptability.
2Loss of time
If the terminal device waits for network scheduling before sending the reference signal, then the transmission can be coordinated, but this introduces delay and reduces the speed of obtaining downlink channel information
Solution Approach 1:
The patent enables the terminal device to determine and send the reference signal proactively based on pre-configured parameters, without waiting for network scheduling. This preliminary action allows the terminal device to initiate the information transmission process in advance, reducing delay and improving the speed of downlink channel information acquisition while maintaining operational simplicity through pre-established transmission rules.
3Productivity
If the network device obtains downlink channel information quickly, then transmission scheduling can be accelerated, but the complexity of determining and transmitting the reference signal increases
Solution Approach 1:
The patent employs parameter changes by allowing the terminal device to determine transmission parameters (such as timing, frequency, and encoding) based on pre-configured settings or downlink channel information itself. This approach enables quick acquisition of channel information while managing complexity through parameterization, where the reference signal transmission becomes a standardized process with adjustable parameters rather than a complex ad-hoc procedure.
Data Source
AI summary
Example communication methods and example apparatus are provided. One example method includes determining, by a terminal device, a first parameter for sending a first reference signal based on downlink channel information, where the first reference signal carries the downlink channel information, and sending the first reference signal to a network device based on the first parameter.