Configuration Scenario for Multi-Hop Relay Network

IEEE 802.16 Presentation Submission Template (Rev. 8.3)Document Number:

IEEE C802.16mmr-06/013Date Submitted:

2006-01-09Source:

Changhoi Koo, Purva R Rajkotia Voice: +1-972-761-7934Samsung Telecommunications America Fax: +1-972-761-790975081 1130 E.Arapaho Rd. Richardson TX E-mail: chkoo@samsung.com

Venue:IEEE 802.16 Session #41, New Delhi, India

Base Document:None

Purpose:Information

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Configuration Scenario for Multi-Hop Relay Network

Changhoi Koo and Changhoi Koo and PurvaPurva R R RajkotiaRajkotia

Samsung Telecommunications AmericaSamsung Telecommunications America

January, 2006

Contents

• Multi-Hop Relay Architecture

• Comparison of Multi-Hop Relay Systems with Conventional Systems

• Multi-Hop Relay Channel Configuration

• Multi-Hop Relay Configuration Set-up Scenario

• Multi-Hop Bandwidth Allocation Mechanism

• Multi-Hop Power Control and Load Control Mechanism

1

Multi-hop Relay Architecture

Conventional RAN

• Limitation: Fixed BS location and cell coverage (less flexible)

• In the next generation RAN,

– Various traffic demand, ever-changing user distribution

– Large number of small cells

• Not easy to construct such RAN in the conventional (centralized) manner

Ad-hoc Network

• Rapidly deployed without relying on pre-existing fixed network infrastructure

• Application– Military Communication, Wireless LAN, Wireless PAN, Wireless

Sensor Network• Features

–– SelfSelf--organizingorganizing, Dynamic topology, Dynamic topology

Gateway OrdinaryCluster HeadBase Station Mobile Station

AdAd--hoc Networkhoc NetworkCellular NetworkCellular Network

Multi-hop Cellular Networks

• Hybrid network of Cellular and Ad-hoc

– Fixed BS (stability) + Multi-hop Relay (flexibility)

• Hybrid transmission mode

– Provides flexibility in design and operation of the cellular network

Single-hop mode Multi-hop mode

One Example of MMR Configuration2 BS and 1 RS configuration

Advantages:•Cost Effective Cell Planning

•Reduction of Signaling Overhead

•Timely delivery of Signals

Multi-Hop Relay Channel Configuration

Multi-Hop Relay Channel Configuration

• Configuration 1 of the multi-hop relay network

Multi-Hop Relay Channel Configuration• Channel configuration for configuration 1

Path Direction ChannelAllocation

BWAllocation

AvailableChannel Scheduling fashion

Dedicated Sub-carriers Fixed BW

Dynamic Sub-carriers

Dynamic BWw/wo limitation

DL_2 RS to MS Dynamic Control/Traffic channel

RS allocates BWto MS through

the BW allocated from the BS

DedicatedSub-carrier Fixed BW

Dynamic Dynamic BW

Control/Trafficchannel

With/withoutContentionUL_1 RS to BS

Control/Traffic channel

BS allocatesparticular BW

to RS (No MS aware BW

allocation)

DL_1 BS to RS

Multi-Hop Relay Channel Configuration

• Configuration 2 of the multi-hop relay network

Multi-Hop Relay Channel Configuration• Channel configuration for configuration 2

Path Direction Channel allocation

BWallocation

Availablechannel Scheduling fashion

Dedicated Sub-carrier Fixed BW

Dynamic Sub-carrier

Dynamic BWw/wo limitation

DL_2 RS to MS Dynamic Traffic channel

RS allocates BW for Traffic only to MS

through the BW allocated from the BS

DL_3 BS to MS Dynamic Control channel(Net. Entry)

BS allocates BW for Signaling only to MS

DedicatedSub-carrier Fixed BW

Dynamic Dynamic BW

UL_2 MS to RS Dynamic Traffic channel With/without contention

UL_3 MS to BS Dynamic Control channel(Net. Entry) With/without contention

Control/Traffic channel

With/withoutContentionUL_1 RS to BS

Control/Traffic channel

BS allocates particular BW to RSDL_1 BS to RS

Multi-Hop Relay Configuration Set-up Scenario

MMR Configuration Set-up Scenario• Multi-hop cellular networks provides an alternative path to the

single hop direct link. It also obtains a path gain in the condition of free space propagation and as a result of which there is an added capacity and coverage to the network.

• The RS can also have multiple connections to the BS and at the same time, communicate with the MS in the cell boundary of 2 BS.

• Hence, a framework of communication link is needed between the multiple base stations, mobile station and relay station, for effective operation of the multi-hop relay network.

• The present contribution describes the framework for the communication between the different entities in the multi-hop relay network.

MMR Configuration Set-up Scenario• Call Flow for MS initiated Case in BS

• Call Flow for MS initiated case in RS

MMR Configuration Set-up Scenario

Multi-Hop Relay Bandwidth Allocation Mechanism

Multi-Hop Relay Bandwidth Allocation Mechanism

• Bandwidth Allocation in the MMR architecture is tricky and critical.

• Bandwidth should be allocated in the cell configuration in which the RS is connected to the multiple base stations.

• MS connected to the RS having different paths may have different capacity because of the link going thru’ the different multipath effect.

• If the RS allocates the higher bandwidth to the MS, but not supported by the BS, then the effective bandwidth is reduced, as the link between the RS and the BS would serve as a bottleneck.

• The contribution suggests the effective mechanism to quickly vary the total available bandwidth and resulting in effective bandwidth allocation.

Multi-Hop Relay Bandwidth Allocation Mechanism

• Bandwidth Allocation Mechanism

Multi-Hop Relay Power Control and Load Control Mechanism

Multi-Hop Relay Power Control Mechanism

• The base station coverage is limited by a combination of the range from the Base station, terrain blockage and building penetration loss.

• The communication between the Base station and the mobile station can be extended by the RS, which may be fixed or mobile.

• However the coverage extension or user data rates of the cell using the above means is limited by the available power at the RS.

• In this proposal, the effective technique for providing the coverage extension is provided with minimal usage of power.

Multi-Hop Relay Power Control Mechanism

• Available Power lower at the RS

Multi-Hop Relay Load Control Mechanism

• The base station coverage is limited by a combination of the range from the Base station, terrain blockage and building penetration loss.

• The communication between the Base station and the mobile station can be extended by the RS, which may be fixed or mobile.

• However the coverage extension or user data rates of the cell using the above means is limited by the loading of the RS.

• In this proposal, the effective technique for providing the coverage extension is provided taking into consideration the load at the RS.

Multi-Hop Relay Load Control Mechanism

• Available Load reaches the threshold at RS