Resource Mapping for Physical Channels in Multi-Cell Systems
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Solution Overview
Problem
In a multi-cell wireless communication environment, existing technologies face challenges in correctly and efficiently allocating resources for physical channels, including reference signals, transmit timing, and power, which hinders accurate reception of downlink data by user equipment (UE).
Innovation Solution
A method for a user equipment (UE) to receive a downlink channel from multiple transmit points by receiving resource mapping position information, demodulating data based on UE-specific or cell-specific reference signals, and managing transmit power and timing, specifically using a modified carrier indicator field (CIF) to indicate participating cells and scrambling sequences for correct demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single cell MIMO system is used, then the system structure is simple, but the throughput and coverage are limited
Solution Approach 1:
The patent combines multiple transmit cells into a coordinated multipoint system where multiple cells jointly serve a single user equipment. This merging of multiple cell resources enables improved throughput and coverage by utilizing multiple transmit paths simultaneously, transforming a single-cell limitation into a multi-cell advantage.
Solution Approach 2:
The patent enables a single user equipment to receive signals from multiple transmit cells through coordinated multipoint operation. The system achieves multi-functionality by allowing the same UE to be served by different cells depending on channel conditions, location, and traffic requirements, thereby improving overall system productivity without proportionally increasing complexity.
2Productivity
If coordinated multipoint system is implemented, then throughput of cell edge UE is improved, but resource allocation complexity increases
Solution Approach 1:
The patent segments the resource allocation process by introducing separate indicator fields in downlink control information: one for indicating the cell-specific reference signal resource and another for indicating the transmit cell. This segmentation allows the UE to independently determine reference signal resources and data transmission cells, simplifying the overall resource allocation complexity while maintaining improved throughput for cell edge UEs.
Solution Approach 2:
The patent introduces an intermediary signaling mechanism where the network transmits specific indicator information through downlink control information to guide the UE's resource allocation and demodulation process. This intermediary signaling acts as a mediator between the complex multi-cell coordination and the UE's reception process, reducing the complexity burden on the UE while achieving improved cell edge throughput.
3Measurement precision
If multiple reference signals are used for demodulation, then demodulation accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The patent segments the reference signal structure by introducing UE-specific reference signals separately from cell-specific reference signals. The UE-specific reference signals are dedicated to individual user equipment for demodulation purposes, while cell-specific reference signals serve broader functions. This segmentation improves demodulation accuracy for each UE without requiring the UE to process all reference signals from all cells, thereby managing signal processing complexity.
Solution Approach 2:
The patent applies local quality by providing UE-specific reference signals that are tailored to individual user equipment's channel conditions and location. Instead of using a uniform reference signal approach for all UEs, the system optimizes reference signal characteristics locally for each UE, improving demodulation accuracy for cell edge UEs while keeping the signal processing requirements manageable through targeted rather than universal processing.
Data Source
AI summary
The present invention relates to a wireless communication system. More particularly, provided is a method for determining a resource allocation scheme, related reference signals, transmission timing, transmission power, scrambling and the like for a physical channel so that a terminal can receive in an accurate and efficient manner the physical channel transmitted in a multiple cell environment.