Base Station Scheduling for Wavelength Division Multiplexing
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Solution Overview
Problem
In radio macro base station networks, terminals on the edge of a cell receive low power signals due to suboptimal beam coverage, leading to interference and inefficient resource allocation in wavelength division multiplexing systems, where identifying and measuring beam components is challenging.
Innovation Solution
A scheduling method that performs orthogonal encoding on downlink reference signals, maps logical port information to physical channels, and calculates spectral efficiency gain based on channel quality indicators to optimize radio resource scheduling for wavelength division multiplexing, enabling improved interference estimation and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard single site directional three-sector beam pattern with 65-degree main lobe width is used to achieve optimal network coverage topology, then broadcast level distribution is optimized for most cell locations, but terminals on the cell edge receive low power signals with insufficient coverage and potential interference
Solution Approach 1:
The patent segments the cell coverage into multiple directional beams (first beam and second beam) with different orientation angles. The base station transmits reference signals through multiple beams simultaneously, allowing terminals at different locations (including cell edges) to receive signals from beams optimally directed toward them, thereby improving received signal power while maintaining overall coverage topology
Solution Approach 2:
The patent introduces a spatial dimension by using multiple beams with different orientation angles in the angular domain. Instead of a single omnidirectional or fixed-direction beam, the system transmits reference signals through multiple beams spanning different directional angles, enabling terminals at various angular positions around the base station to receive adequate signal power
2Reliability
If multiple beams are used to provide differentiated coverage for terminals, then coverage quality for edge terminals is improved, but wavelength division multiplexing scheduling becomes difficult because beam components cannot be identified or measured in the reference signal
Solution Approach 1:
The patent applies preliminary orthogonal encoding to reference signals before transmission through multiple beams. This pre-processing ensures that each beam component in the transmitted reference signal maintains orthogonality and can be independently identified and measured by terminals and the base station, enabling subsequent wavelength division multiplexing scheduling without increasing complexity
Solution Approach 2:
The patent implements a feedback mechanism where terminals measure the orthogonally encoded reference signals and feed back channel quality indicators to the base station. The base station uses this feedback to determine spectral efficiency gains from wavelength division multiplexing, enabling informed scheduling decisions that account for actual channel conditions and beam components
3Measurement precision
If orthogonal encoding is applied to downlink reference signals and mapped to physical channels, then beam components can be identified and measured, but system complexity increases due to encoding and scheduling calculations
Solution Approach 1:
The patent changes the encoding parameter of reference signals from conventional encoding to orthogonal encoding. This parameter change enables precise identification and measurement of beam components through the orthogonality property, while the standardized orthogonal encoding process keeps the implementation complexity manageable through efficient mathematical operations
Data Source
AI summary
Embodiments of the present invention disclose a scheduling method, a base station, and a terminal. The method includes: performing, by a base station according to a preset matrix, orthogonal encoding on logical port information corresponding to a downlink reference signal, and mapping the logical port information obtained after the orthogonal encoding to a corresponding physical channel for sending; receiving channel quality indicator information fed back by a terminal, and calculating a spectral efficiency gain obtained after wavelength division multiplexing; and performing, according to the spectral efficiency gain, radio resource scheduling for the wavelength division multiplexing.