CSI Determination Using Indicated Reference Signal Positions
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Solution Overview
Problem
Existing communication systems face inefficiencies in determining channel state information (CSI) due to the wastage of time-frequency resources and high computational complexity, particularly in TDD and FDD systems.
Innovation Solution
A method involving a network device indicating positions for sending downlink and uplink reference signals to a terminal device, allowing the terminal to determine channel statistics without occupying excessive resources and reducing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device sends a large quantity of reference signals to enable accurate channel measurement, then the channel state information can be determined accurately, but the time-frequency resources are wasted
Solution Approach 1:
The patent segments the reference signal transmission into two parts: downlink reference signals sent by the network device and uplink reference signals sent by the terminal device. The network device indicates specific positions for these reference signals, allowing the terminal to determine channel statistics information without transmitting excessive reference signals, thus resolving the contradiction between measurement accuracy and resource consumption
Solution Approach 2:
The patent introduces channel statistics information as an intermediary element. The terminal device determines channel statistics information based on downlink reference signals received from the network device, and the network device uses this statistics information along with uplink reference signals to determine channel state information. This intermediary approach reduces the burden on the terminal device and optimizes resource usage
2Measurement precision
If the terminal device calculates channel state information based on downlink pilot, then the channel state information can be obtained, but the calculation complexity of the terminal device becomes high
Solution Approach 1:
The patent introduces channel statistics information as an intermediary that simplifies the calculation process. Instead of the terminal device directly calculating complex channel state information from downlink pilots, the terminal first determines channel statistics information from downlink reference signals, and then the network device uses this simplified statistics information along with uplink reference signals to determine the final channel state information, significantly reducing terminal device calculation complexity
Solution Approach 2:
The patent uses uplink reference signals as a simplified copy or representation of the downlink channel characteristics. The network device determines channel state information by combining channel statistics information (derived from downlink reference signals) with uplink reference signals, avoiding the need for the terminal device to perform complex calculations on the original downlink pilot data
Data Source
AI summary
A method for determining channel state information and a communication apparatus. The method includes: sending first indication information, where the first indication information indicates a position for sending a downlink reference signal; receiving channel statistics information, where the channel statistics information is determined based on the downlink reference signal; sending second indication information, where the second indication information indicates a position for sending an uplink reference signal; and receiving the uplink reference signal, and determining channel state information based on the uplink reference signal and the channel statistics information. According to the method, a terminal device sends the uplink reference signal based on an indication of a network device, and therefore a large quantity of time-frequency resources may not be occupied. Therefore, the terminal device is not required to have high calculation complexity.