CoMP Downlink Control Information Transmission via Serving Base Station Coordination

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Solution Overview

Problem

There is a growing demand for efficient methods to transmit control information in Coordinated Multi-Point (CoMP) wireless communication systems, which face challenges in managing downlink control information across multiple cells and base stations.

Innovation Solution

A method where a mobile station receives downlink control information from a serving base station using a cyclic shift value and base sequence, allowing it to determine the best downlink channel status among multiple cells and transmit ACK/NACK and CQI information effectively, while the serving base station coordinates with other base stations to optimize channel resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If downlink control information is transmitted from multiple base stations in CoMP systems, then data transmission efficiency is improved, but interference management and resource coordination complexity increases

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidresource coordination complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments downlink control information into different types (e.g., PDCCH, PHICH) and transmits them through different base stations or channels. This allows each base station to handle specific control information types, reducing the coordination complexity while maintaining the benefits of multi-point transmission for data efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a coordinating base station or controller that manages the transmission of control information among multiple base stations. This intermediary entity handles the complexity of resource allocation and interference management, allowing individual base stations to focus on data transmission efficiency without direct peer-to-peer coordination overhead.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If control information is transmitted across multiple cells, then system capacity is enhanced, but interference management difficulty increases

Engineering Contradiction:

Improvesystem capacityVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by allowing different base stations to transmit control information with different power levels, modulation schemes, or resource allocations tailored to their local channel conditions. This enables optimized transmission for each cell while managing interference through localized adaptation rather than uniform transmission across all cells.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent converts interference into a beneficial effect by using coordinated interference cancellation techniques where control information from multiple base stations is designed to interfere constructively at the intended receiver while canceling interference at other receivers. This transforms the harmful interference into a mechanism for improving system capacity through intelligent signal design.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS10098148B2Method of control information in wireless communication system

Publication Date: 2018.10.09 LG ELECTRONICS INC

AI summary

A method of transmitting control information in a wireless communication system is disclosed. A method of receiving control information in a mobile station which receives downlink data from a plurality of cells simultaneously in a wireless communication system comprises receiving downlink control information including the control information on data transmitted from the plurality of cells from a serving base station via a downlink control channel.