Abis Interface Over Satellite Feature Guide

ZGO-05-01-001 Abis Interface

over Satellite

Feature Guide

ZGO-05-01-001 Abis Interface over Satellite

ZTE Confidential Proprietary 1


Version Date Author Reviewer Notes

V1.00 2014/1/15 Li Zhengren Gu Yuhui New

2014 ZTE Corporation. All rights reserved.

ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used

without the prior written permission of ZTE.

Due to update and improvement of ZTE products and technologies, information in this document is subjected to

change without notice.


2 ZTE Confidential Proprietary

TABLE OF CONTENTS

1 Feature Attribute ............................................................................................... 4

2 Overview ............................................................................................................ 4

2.1 Feature Introduction ............................................................................................. 4

2.2 License Control .................................................................................................... 5

2.3 Correlation with Other Features ........................................................................... 5

3 Technical Description ....................................................................................... 5

4 Parameters ......................................................................................................... 7

5 Related Counters and Alarms .......................................................................... 7

5.1 Related Counters ................................................................................................. 7

5.2 Related Alarms .................................................................................................... 8

6 Engineering Guide ............................................................................................ 8

6.1 Application Scenario ............................................................................................ 8

6.2 Feature Activation Procedure ............................................................................... 8

6.3 Feature Validation Procedure............................................................................. 11

6.4 Feature Deactivation Procedure ......................................................................... 11

6.5 Impact on the Network Impact............................................................................ 12

7 Abbreviation .................................................................................................... 12

8 Reference Document ....................................................................................... 13



FIGURES

Figure 3-1 ZXG10 BTS V3 DIP Switch Schematic Diagram ................................................ 6

Figure 6-1 Site Equipment Topology ................................................................................... 9

Figure 6-2 Creating a New Site ..........................................................................................10

Figure 6-3 Site Attribute Configuration ...............................................................................10

Figure 6-4 Site Attribute Configuration ...............................................................................12

TABLES

Table 2-1 License Control List ............................................................................................ 5

Table 4-1 Parameters List ................................................................................................... 7



1 Feature Attribute

BSC version: [ZXG10 iBSC V6.50.20]

BTS version: [Independent of the BTS hardware platform]

Attribute: [Optional]

Involved NEs:

NE Name Related or Not Special Requirement

MS -

BTS

BSC

iTC -

MSC -

MGW -

SGSN -

GGSN -

HLR -

: Involved, -: Not involved

2 Overview

2.1 Feature Introduction

When the Abis interface is extended over satellite, there is no change or effect on BSS

functions. The main problem is the transmission delay, which affects Abis signaling

processing, voice processing, and clock processing. In most cases, the single-way delay

is around 250-280ms for GEO (geostationary earth orbit).

By adjusting the related timer, increasing time for data receiving and dispatch and time

for retransmission delay as well as caching data, the ZTE BSS system can effectively

remove the negative impact such as delay, jitter and other effects caused by satellite

transmission, thus ensuring voice and data service quality.



The Abis interface supports satellite transmission through TDM transmission and IP

transmission.

During SDCCH establishment, an immediate assignment command is sent in advance,

and access delay is thus decreased.

2.2 License Control

Table 2-1 License Control List

Feature ID Feature Name License

Control Item

Configured

NE Unit

ZGO-05-01-001 Abis Interface over

Satellite N/A N/A N/A

2.3 Correlation with Other Features

None

3 Technical Description

Applying satellite transmission on the Abis interface does not present functional changes

to the BSS but only brings a delay of hundreds of milliseconds (depending upon satellite

orbit altitude) to the Abis interface, so this chapter focuses on configuring the satellite

transmission modes and dealing with the delay.

For BTS V3 series base stations transmitting data through the LAPD protocol, the

change needs to be sent to the software through DIP switches. Figure 3-1 shows the DIP

switches for the BTS V3 series base stations.



Figure 3-1 ZXG10 BTS V3 DIP Switch Schematic Diagram

In the above figure, the SATE bit determines whether to use the satellite Abis link (0

indicates the common Abis interface, while 1 indicates the satellite Abis interface). The

type of the Abis interface is set to satellite through the DIP switch. After the base station

is energized, the OM reads the DIP code, configures the Abis interface type to satellite

and notifies this change to the LAPD module. The LAPD module then sends the change

to the BSC through the authentication message ID_Request of the link. After the

authentication is successful, both sides of the LAPD link are informed that the type of the

Abis interface and the following parameter changes are made:

The frame re-transmitting timer is increased from 400ms to 1200ms.

The size of the receiving and transmitting sliding windows is expanded from 16 to 32.

These changes are used to deal with a transmission delay increase of 250ms to 1000ms.

For base station transmission through the IP protocol, such as the S8001 and SDR base

stations, no configuration of the DIP switch is made and parameters of the transmission

protocol for the bearing part are automatically adjusted by the SCTP protocol stack.

With the Abis interface over satellite feature enabled, the base station attribute needs to

be set to the Abis interface satellite transmission on the backend system. The

parameters of the data services will be adjusted in the same way as the LAPD link

parameters are adjusted. Such adjustment has nothing to do with whether the Abis

transmission is in E1 or IP mode. The adjustment is as follows:

The downlink delay time increases by 1040ms, namely two-way delays for two satellites.

14 13 345678910111215 012

BTS_TYPE BTS_NO SLAVE1_PORT SLAVE2_PORT SATE ABIS_PORT ABIS_TS



If the T3193 length of the timer is more than 520ms, the length is decreased by 520. If it

is not more than 520ms, the length is set to 0.

4 Parameters

Table 4-1 Parameters List

Mana

ged

Objec

t

Logic

Name Parameter Description

Value

Range Unit

Defa

ult

Valu

e

Rec

om

men

ded

Valu

e

Site

Equip

ment

ABIS

satellite

access

type

This parameter indicates

whether the site uses the

satellite mode or satellite

backup mode at Abis

interface.

0:Non-s

atellite

ABIS

access

1:Satelli

te ABIS

access

2:Satelli

te ABIS

access

backup

N/A

0:No

n-sat

ellite

ABIS

acce

ss

0:No

n-sat

ellite

ABI

S

acce

ss

Site

Equip

ment

Super

site work

mode

This parameter sets the

connection mode between

the super site and BSC.

0:

double

BSC

1: single

BSC

N/A

0:

doub

le

BSC

0:

doub

le

BSC

5 Related Counters and Alarms

5.1 Related Counters

This feature has no related counter.



5.2 Related Alarms

This feature has no related alarm.

6 Engineering Guide

6.1 Application Scenario

When a BTS is located in a remote region, it is economical to provide a satellite link

between the BSC and the BTS, for example, a BTS in the desert area.

When communication needs to be resumed after a disaster, the satellite link can quickly

resume the communication between the BTS and the BSC. For example, the BTS within

a disaster area uses a satellite link for communication after an earthquake.

6.2 Feature Activation Procedure

In the Configuration resource tree, select Modify Area>Managed Element>GSM

Logical Configuration>Site Information Configuration and double-click Site

Equipment. See the following figure.



Figure 6-1 Site Equipment Topology

On the left top of the right pane, click the New button to create a new site. See the

following figure.



Figure 6-2 Creating a New Site

Set Abis Satellite access type to Satellite Abis access. See the following figure.

Figure 6-3 Site Attribute Configuration



The application scenario is a single BSC scenario, which means that Super site work

mode is set to Single BSC when both the active and standby links are connected to the

same BSC. If they are connected to different BSCs, this parameter needs to be set to

Double BSC.

6.3 Feature Validation Procedure

Test Item Abis interface over satellite test

Prerequisites 1. The OMM is healthy.

2. The BSC is healthy.

3. The BTS(E1 Abis) is healthy.

Steps 1. Set the Abis mode to satellite mode.

2. Initiate a voice call.

3. Disconnect the Abis link in a flash.

Expected Result The voice call is normal.

6.4 Feature Deactivation Procedure

In the configuration resource tree, select Modify Area>Managed Element>GSM

Logical Configuration>Site Information Configuration and double-click Site

Equipment. Set ABIS satellite access type to 0.See the following figure.



Figure 6-4 Site Attribute Configuration

6.5 Impact on the Network Impact

This feature does not affect the BSC capacity or BTS capacity.

7 Abbreviation Abbreviation Full Name

3GPP 3rd

Generation Partnership Project

BCCH Broadcast Control Channel

BSC Base Station Controller

BTS Base Transceiver Station

CS Circuit Switch

EDGE Enhanced Data rates for GSM Evolution

EFR Enhanced Full Rate

FR Full Rate



GERAN GSM Edge Radio Access Network

GSM Global System for Mobile communications

HR Half Rate

PS Packet Switch

PDTCH Packet Data Traffic Channe1

SDCCH Stand-alone Dedicated Control Channel

TCH Traffic Channel

8 Reference Document

ZXG10 iBSC (V6.50.20) Base Station Controller Performance Counter Reference

ZXG10 iBSC (V6.50.20) Base Station Controller Radio Parameter Reference

Abis Interface Over Satellite Feature Guide

Documents

Transcript of Abis Interface Over Satellite Feature Guide