Multi-Access Point Calibration for Coherent Transmission
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Solution Overview
Problem
In CoMP systems, phase and amplitude differences between uplink and downlink channels of different access points lead to poor coherent data transmission, degrading system performance.
Innovation Solution
A method and device for multi-access point calibration, where a base station estimates and calibrates phase and amplitude differences between access points by traversing value intervals, performing phase and amplitude calibration based on error rates and Modulation and Coding Scheme (MCS) adjustments, to ensure coherent data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple access points transmit data jointly without calibration, then device complexity is reduced, but phase and amplitude differences cause poor coherent transmission and degraded system performance
Solution Approach 1:
The patent applies parameter changes by adjusting phase and amplitude parameters of transmitted signals at different access points. The base station estimates channel parameters and calculates compensation values to correct phase and amplitude deviations, enabling coherent transmission without complex hardware calibration systems.
2Manufacturing precision
If the base station traverses value intervals to estimate parameter deviations, then manufacturing precision of transmission coherence is improved, but loss of time increases due to iterative estimation
Solution Approach 1:
The patent implements feedback by having the user equipment measure reference signals and feed back channel quality indicators (CQI) to the base station. The base station uses this feedback to iteratively estimate phase and amplitude deviations, adjusting parameters based on measured performance to achieve accurate calibration.
Solution Approach 2:
The patent applies preliminary action by performing channel estimation and parameter calculation before actual data transmission. The base station pre-computes compensation parameters based on estimated channel conditions, allowing coherent transmission to proceed efficiently without real-time iterative adjustments during data transmission.
3Reliability
If the base station performs detailed phase and amplitude calibration, then coherent transmission quality is improved, but device complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a base station-based processing unit that performs parameter estimation and calculation. This centralizes the complex calibration processing at the base station rather than requiring complex coordination between multiple access points, simplifying the overall system architecture while maintaining calibration quality.
Data Source
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AI summary
A method and device for multi-access point calibration are disclosed. The method includes: a base station estimating a value closest to a true parameter deviation in a value interval of an uplink and downlink channel parameter deviation between access points, wherein the parameter deviation includes a phase difference and an amplitude difference; and the base station performing phase and/or amplitude calibration on service data transmitted jointly by the access points according to the value. With the method and device provided in the present invention, a cell calculates a parameter difference between different access points, and then calibrates multiple access points according to the parameter difference, so as to solve a problem that the phase difference and amplitude difference exist between the data transmitted jointly between the multiple access points, and thus it can be guaranteed that good coherent transmission is performed between the access points, thereby improving the system performance.