Backhaul Congestion Control (BCC) Feature

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APPLICATION NOTE |Backhaul Congestion Control (BCC) Featurewww.sevis.com

Overview

Mobile backhaul networks are designed as non-blocking. They must not be the boleneck or congeson point

within a mobile network. Satellite communicaon links are expensive and when used for mobile backhaul

typically become the congeson failure point. Mobile networks are designed to manage congeson within the

radio interface and even congeson within the network due to HSPA service. Mobile networks ensure voice,

mobility management and other crical mobile services are not impacted when congeson over the radio

interface occurs. This is not the case when the backhaul network becomes the congeson point.

Sevis' mobile backhaul opmizaon products include a set of Intelligent Opmizaon features that are network

aware and designed to improve opmizaon, increase network reliability, and enhance the user experience. The

patent pending Backhaul Congeson Control (BCC) feature, available within the suite of Intelligent Opmizaon

features, offers GSM operators and satellite bandwidth providers a new opon for prevenng and alleviang

bandwidth congeson on mobile backhaul links.

Backhaul Congeson Control detects congeson within the backhaul network and based on operator configured

thresholds implements standard based methods to prevent congeson. It provides control at a base staon

level and forces the use of more efficient codecs during mes of congeson.

When combined with the tradional opmizaon methods, BCC increases opmizaon significantly with savings

up to 70%.

Backhaul Congestion Control (BCC) FeaturIntelligent Optimization

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Bandwidth saving comparisons


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Applicaon

The BCC feature is applicable to all mobile networks that support the more bandwidth efficient codecs such as

GSM half rate or adapve mul-rate half rate (AMR HR) codecs. By using these codecs, the amount of data

required for a voice call or traffic channel (TCH) is reduced by 50%.

The BCC feature monitors the backhaul link capacity and ulizaon and invokes radio resource congeson

procedures to eliminate backhaul congeson. The procedures to eliminate congeson control include informing

the network to select the most efficient voice codec supported by the mobile staon for each call (traffic

channel) in use over the satellite links.

The BCC feature allows the operator to select individual base staons and specifically which backhaul links to

monitor and applies congeson control features only to those specific links. In addion, it allows the operator

to priorize codecs with no limit to the number of codecs selected.

The BCC feature ensures codec compability with the mobile staon. It operates in mulple modes. The modes

are defined as:

Passive Monitoring The backhaul link is monitored for cases where the feature may be applied. In this

mode, no action is taken but useful statistics are available for network engineering and planning

purposes.

Congestion Control Mode In Congestion Control Mode, the system monitors WAN data rates and

compares the measured rates to provisioned thresholds. Thresholds are set for data rates incoming

from the WAN or outgoing to the WAN. When the measured rate exceeds the provisioned threshold

rate, the BCC features are invoked to reduce bandwidth to levels below the thresholds.

Optimization and Power Savings Mode In Optimization and Power Savings Mode, the system

continuously processes traffic channels for voice to ensure 50% reduction in data rate when supported

by the mobile station. This mode also results in less power used by the BTS. This mode is not

dependent on thresholds.

Backhaul Congeson Control (BCC) Enabled


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Addionally, BCC monitors mulple key performance indicators (KPIs) to support both GSM operators and

satellite bandwidth providers. Example KPIs available include:

Candidate calls - Number of calls capable of a 50% reduction in data rate

Non-candidate calls - Number of calls that cannot use more efficient codecs

Calls modified - Number of calls with reduced data rates

Total calls - Total number of calls received, including number of calls per base station

Summary of Benefits:

The BCC feature, as part of Sevis' Intelligent Opmizaon suite of mobile network aware features provide the

following benefits:

Improve Optimization

50% reduction in the data rate required for each call

Threshold triggered or always on

Per BTS control without requiring changes to the BSS equipment

Increase Network Reliability

Congestion control procedures based on the backhaul network's performance

Prioritize critical mobile services such as voice and SMS

Reduced BTS power usage

No changes required to the BSS equipment

Enhance the User Experience

Force the use of higher latency tolerant codecs over satellite links

Ensure voice service is available

KPIs available for both the GSM operators and satellite bandwidth providers

Sevis' mobile backhaul opmizaon soluons are leading the market through network aware Intelligent

Opmizaon features. Don't sele for transport opmizaon soluons but rather intelligent, service aware

soluons focused on improving opmizaon, increasing network reliability, and enhancing the user experience.

About Sevis Systems

Sevis Systems is a leading provider of enhanced mobile backhaul and signaling applicaons to mobile network

operators. Several of the worlds largest mobile operators rely on Sevis products to enable new services andincrease operaonal efficiencies within their networks. Sevis products are sold worldwide via a network of OEM

and distribuon partners.

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Sevis Systems, Inc.

2805 N. Dallas Parkway

Suite 530

Plano, TX 75093 USA

Phone: +1 469 368-7000

Backhaul Congestion Control (BCC) Feature

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