Reference Signal Mapping Offset for Multi-Cell Bandwidth Adaptation
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Solution Overview
Problem
Current reference signal sequencing in wireless communication systems, such as LTE, faces challenges in accommodating different cell bandwidths, particularly in coordinated multi-point transmission/reception scenarios, where frequency alignment is required, limiting joint processing capabilities between cells with varying bandwidths.
Innovation Solution
A method and apparatus for generating and mapping reference signals that determine an offset based on each cell's bandwidth, allowing the reference signal sequence to be aligned across physical resource blocks, enabling seamless joint processing even among cells with different bandwidths without specific frequency alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency alignment is required for reference signals in coordinated multi-point transmission, then joint processing capabilities between cells are limited, but reference signal mapping becomes simpler
Solution Approach 1:
The patent applies local quality by making the reference signal mapping cell-specific rather than system-wide. Each cell determines its own offset based on its local bandwidth characteristics, allowing different cells to have different mapping configurations. This enables joint processing between cells with different bandwidths while maintaining manageable complexity through localized adaptation.
Solution Approach 2:
The patent changes the mapping parameters dynamically based on cell bandwidth. The offset parameter is determined as a function of cell bandwidth (e.g., offset = 0 for bandwidth ≤ 10 MHz, offset = 1 for bandwidth > 10 MHz), allowing the system to adapt to different bandwidth configurations without requiring complex frequency alignment procedures.
2Productivity
If reference signals are mapped without considering cell bandwidth differences, then mapping is simpler, but joint transmission/reception efficiency decreases
Solution Approach 1:
The patent introduces bandwidth-dependent parameter changes to the reference signal mapping. By adjusting the offset parameter based on cell bandwidth, the system optimizes joint transmission efficiency for different bandwidth scenarios without requiring fundamentally complex procedures. The eNB determines the offset based on its cell's bandwidth and applies it during reference signal generation.
3Adaptability or versatility
If cells with different bandwidths use the same reference signal sequence, then frequency alignment is required, but joint processing is enabled
Solution Approach 1:
The patent enables each cell to have locally optimized reference signal mapping parameters based on its bandwidth characteristics. This local adaptation eliminates the need for strict frequency alignment between cells with different bandwidths, as each cell's reference signals are mapped according to its own bandwidth requirements while maintaining compatibility for joint processing.
Data Source
AI summary
Described is a method for the mapping of reference signals. The method includes generating a reference signal sequence for two or more cells, where each cell of the two or more cells has a cell bandwidth. The method also includes determining an offset for the reference signal sequence based at least in part on the cell bandwidth of each cell. Mapping the reference signal sequence to resource elements of physical resource blocks for the cells based at least in part on the offset is included in the method. Apparatus and computer readable media are also disclosed.