MIMO Path Domain Parameter Feedback for Overhead Reduction
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Solution Overview
Problem
In MIMO technology, the high number of antennas or logical ports at base stations leads to significant downlink pilot overheads and uplink feedback overheads, posing a bottleneck in reducing these overheads effectively.
Innovation Solution
A communication method where a terminal device obtains path domain parameters shared by uplink and downlink channels, estimates additional path domain parameters, and feeds back these parameters to the network device, allowing for reduced downlink pilot and uplink feedback overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large quantity of antennas or logical ports are used in MIMO technology, then system capacity and spectral efficiency are improved, but downlink pilot overheads and uplink feedback overheads increase significantly
Solution Approach 1:
The patent extracts and utilizes only the necessary path domain parameters from the full channel state information. Instead of processing complete CSI matrices, the system identifies and processes specific parameters (power coefficients, direction angles, Doppler factors) that are sufficient for channel reconstruction, thereby reducing overhead while maintaining system capacity
Solution Approach 2:
The patent makes path domain parameters shared between uplink and downlink channels serve multiple functions. These parameters are used for both channel estimation and channel reconstruction, eliminating the need for separate complete CSI feedback and reducing overall signaling overhead
2Productivity
If a large quantity of antennas or logical ports are used in MIMO technology, then system capacity and spectral efficiency are improved, but uplink feedback overheads increase significantly
Solution Approach 1:
The terminal device extracts only the essential path domain parameters (power coefficients, direction angles, Doppler factors) from the received downlink channel information and feeds back only these extracted parameters to the network device, rather than feeding back complete channel state information, thereby significantly reducing uplink feedback overhead
Solution Approach 2:
The network device performs preliminary processing by indicating path domain parameters to the terminal device before the terminal device needs to feed back channel information. This preliminary indication allows the terminal device to reconstruct channels more efficiently with reduced feedback requirements
Data Source
AI summary
This application provides a communication method and a communication apparatus. The method includes: A terminal device obtains first indication information and downlink channel information, where the first indication information indicates a first path domain parameter, the first path domain parameter is a path domain parameter shared by a first uplink channel and a first downlink channel, and the first uplink channel and the first downlink channel are channels for communication between a network device and the terminal device. The terminal device estimates a second path domain parameter based on the first path domain parameter and the downlink channel information, and sends the second path domain parameter to the network device. The first path domain parameter and the second path domain parameter are used by the network device to reconstruct the first downlink channel.