Multihop Relay Frame Structure Adaptation

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Solution Overview

Problem

Conventional wireless communication systems lack a frame structure that allocates resources for both Base Station (BS)-Mobile Station (MS) and BS-Relay Station (RS) links, making it difficult to implement a multihop relay scheme effectively, especially in dynamic traffic distribution scenarios.

Innovation Solution

A method and apparatus for a multihop relay wireless communication system that generates and transmits control signals containing frame structure information to child Relay Stations, allowing them to confirm and use an appropriate frame structure for relay services, including specific subframes for BS-MS, RS-MS, and BS-RS links, and provides frame structure change information when necessary.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional frame structure is used that allocates resources only for BS-MS link, then the system is simple to implement, but it cannot support multihop relay scheme effectively

Engineering Contradiction:

Improvesupport for multihop relay schemeVSAvoidframe structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The frame structure is segmented into distinct subframes: first subframe for BS-MS communication, second subframe for BS-RS communication, and third subframe for RS-MS communication. This segmentation allows each link type to have dedicated resource allocation while maintaining overall system organization and manageability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The frame structure is designed to be universal by incorporating multiple subframes that can serve different communication links (BS-MS, BS-RS, RS-MS) within a single unified framework. This multi-functional design enables the system to support both conventional direct communication and multihop relay operations without requiring separate frame structures.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the frame structure is fixed for conventional BS-MS communication, then the system is stable and easy to operate, but it cannot adapt to dynamic traffic distribution and environmental changes

Engineering Contradiction:

Improveadaptation to traffic distributionVSAvoidsystem operation simplicity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The frame structure incorporates dynamic adaptability by allowing the base station to selectively transmit different frame structures to different relay stations based on current system conditions, traffic distribution, and channel states. This enables the system to optimize performance for varying traffic patterns while maintaining a standardized base frame structure for operational simplicity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system enables parameter changes in the frame structure by allowing modification of subframe allocations, time resource distributions, and frequency resource assignments according to traffic requirements and channel conditions, while maintaining the fundamental frame structure integrity for ease of operation.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If resources are allocated only for direct BS-MS link, then the resource allocation is simple, but transmission delay increases and channel conditions deteriorate in cell boundary areas

Engineering Contradiction:

Improvechannel condition qualityVSAvoidresource allocation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Resource allocation is segmented into dedicated subframes for different link types. The first subframe allocates resources for BS-MS direct links, the second subframe allocates resources for BS-RS relay links, and the third subframe allocates resources for RS-MS relay links. This segmentation enables efficient resource utilization for multihop relay paths while maintaining simple resource management through structured allocation.

Inventive Principle:

Principle #1Segmentation

4Adaptability or versatility

If the wireless network uses fixed base station positions, then the system is stable, but flexibility of network configuration is low under severe traffic changes

Engineering Contradiction:

Improvenetwork configuration flexibilityVSAvoidnetwork structure stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The network configuration achieves dynamic flexibility through the frame structure that can be adaptively adjusted based on traffic distribution and channel conditions. While base station positions remain fixed for stability, the resource allocation and subframe configurations can be dynamically modified to optimize network performance under varying traffic requirements, enabling flexible network operation without compromising structural stability.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8681743B2Apparatus and method for selecting frame structure in multihop relay broadband wireless access communication system

Publication Date: 2014.03.25 SAMSUNG ELECTRONICS CO LTD

AI summary

Apparatus and method for selectively using a frame structure adequate for a system environment in a multihop relay wireless communication system are provided. The method includes generating a control signal including the frame information; and transmitting the control signal to a child Relay Station (RS). Accordingly, the frame structure adequate for the system environment can be used, and the transmission delay and the tradeoff between the overheads in each frame structure can be freely selected.