Cooperative Communication Method in Cellular Wireless Systems

Solution Overview

Problem

In conventional multi-cell coordinated communication methods, information exchange between serving and coordinating cells belonging to different base stations leads to transmission delays and increased traffic in the backhaul network.

Innovation Solution

A method where a terminal wirelessly transmits channel state information (CSI) feedback to both the serving cell and coordinating cells, enabling them to perform multi-point coordinated communication, and the serving cell notifies the terminal of antenna port information to facilitate effective inter-cell communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the serving cell and coordinating cell exchange information through the backhaul network, then multi-cell coordinated communication can be performed, but transmission delay increases and backhaul network traffic increases

Engineering Contradiction:

Improvecoordinated communication performanceVSAvoidtransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the information exchange process by having the terminal independently transmit CSI feedback to both the serving cell and coordinating cells through separate uplink channels. This eliminates the need for the serving cell to relay all CSI information through the backhaul network to coordinating cells, thereby reducing backhaul traffic and transmission delay while maintaining coordinated communication capability.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the serving cell and coordinating cell exchange information through the backhaul network, then multi-cell coordinated communication can be performed, but backhaul network traffic increases

Engineering Contradiction:

Improvecoordinated communication performanceVSAvoidbackhaul network traffic

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent segments the information exchange process by having the terminal independently transmit CSI feedback to both the serving cell and coordinating cells through separate uplink channels. This eliminates the need for the serving cell to relay all CSI information through the backhaul network to coordinating cells, thereby reducing backhaul traffic and transmission delay while maintaining coordinated communication capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The terminal performs self-service by directly transmitting CSI feedback to both the serving cell and coordinating cells without requiring the serving cell to relay this information through the backhaul network. This self-service approach reduces the burden on the backhaul network while enabling coordinated communication between multiple cells.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS9160426B2Cooperative communication method in cellular wireless communication system and terminal for performing the method

Publication Date: 2015.10.13 ELECTRONICS & TELECOMM RES INST

AI summary

Provided is a coordinated communication method in which a plurality of cells cooperate to perform multi-antenna transmission and reception in a cellular wireless communication system. A terminal wirelessly transmits channel state information (CSI) feedback to a serving cell and at least one coordinating cell. The serving cell and the coordinating cell perform multi-point coordinated communication using the CSI feedback. Even if the serving cell and the coordinating cell belong to different base stations, information exchange between the cells is minimized, so that a transmission delay and a traffic increment of a backhaul network can be prevented.