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48 Antenna Hopping About This Chapter

48.1 Overview

This describes the overview of antenna hopping. The antenna hopping function enables the

downlink data carried on one TRX to be randomly transmitted on another TRX. This improves

the quality of the main BCCH TRX data received by the MS and improves the network

performance.

48.2 Availability

This lists the NEs, software, and licenses required for the implementation of the antenna hopping.

48.3 Technical Description

This describes the technical aspects of the antenna hopping. Through the frequency hopping bus,

the data of a TRX can be transmitted randomly on another TRX. The antenna hopping technology

is implemented on the basis of frequency hopping bus and antenna hopping algorithm.

48.4 Implementation

This describes how to configure and verify the antenna hopping.

48.5 Maintenance Information

This lists the alarms related to antenna hopping.

48.6 References

HUAWEI BSC6000 Base Station Subsystem

BSS Feature Description 48 Antenna Hopping

Issue 03 (2008-01-25) Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd

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48.1 Overview

This describes the overview of antenna hopping. The antenna hopping function enables the

downlink data carried on one TRX to be randomly transmitted on another TRX. This improves

the quality of the main BCCH TRX data received by the MS and improves the network

performance.

Definition

Antenna hopping means that the downlink data carried on one TRX can be randomly transmitted

on another TRX.

When antenna hopping is enabled, the data carried on the main BCCH TRX can be transmitted

on other type of TRX, and the data carried on other type of TRX can be transmitted on the main

BCCH TRX.

Purpose

In GSM cells, the frequency, frame number, system message, and paging group of the cell are

sent on the broadcast control channel of the main BCCH TRX. These broadcasts messages are

important for the MS in idle mode to search for the network and for the MS in dedicated mode

to measure the neighbor cells.

If the MS is in an unfavorable position or the antenna of the main BCCH TRX is damaged, the

MS cannot receive the broadcast control messages from the main BCCH TRX properly.

The antenna hopping function enables the data of all the timeslots on the BCCH TRX to betransmitted on the antenna of all the TRXs in the cell in turn. Thus the space diversity is increased

and the quality of the main BCCH TRX data received by the MS is improved. Therefore, the

network performance is enhanced.

Terms

Terms Definition

Frequency

Hopping Bus

Data bus that receives the external TRX data in baseband frequency hopping

or antenna hopping

TimeslotInterval

Hardware interruption every 577 μs specified in the GSM 0502 protocol

Abbreviations

Abbreviations Full Spelling

CA Cell Allocation

FN Frame Number

MAIO Mobile Allocation Index Offset

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BSS Feature Description

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Abbreviations Full Spelling

HSN Hopping Sequence Number

MA Mobile Allocation

FH-BUS Frequency Hopping Bus

D-BUS DATA-BUS

RF Radio Frequency

TRX Transceiver

48.2 Availability

This lists the NEs, software, and licenses required for the implementation of the antenna hopping.

Network Elements Involved

Table 48-1 lists the NEs involved in antenna hopping.

Table 48-1 NEs involved in antenna hopping

MS BTS BSC MSC MGW SGSN GGSN HLR

- √ √ - - - - -

NOTE

l –: not involved

l √: involved

Software Versions

Table 48-2 lists the software releases that support antenna hopping.

Table 48-2 GBSS products and software versionsProduct Version

BSC BSC6000 V900R003C01 and later

releases

BTS BTS3012 BTS3000V100R006 and later

releases

BTS3012AE BTS3000V100R005 and later

releases

BTS3006C BTS3000V100R005 and later

releases





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Miscellaneous

None.

48.3 Technical Description

This describes the technical aspects of the antenna hopping. Through the frequency hopping bus,

the data of a TRX can be transmitted randomly on another TRX. The antenna hopping technology

is implemented on the basis of frequency hopping bus and antenna hopping algorithm.

48.3.1 Frequency Hopping Bus

This describes frequency hopping bus. The antenna hopping technology is implemented based

on the hardware of baseband frequency hopping.

48.3.2 Antenna Hopping Algorithm

This describes antenna hopping algorithm. Through the antenna hopping frequency list and the

ID algorithm, antenna hopping algorithm ensures that the frequency and data of each frame on

the frequency hopping bus is unique and has a one-to-one relationship with the TRX number.

48.3.1 Frequency Hopping Bus

This describes frequency hopping bus. The antenna hopping technology is implemented based

on the hardware of baseband frequency hopping.

When baseband frequency hopping and antenna hopping are enabled, a large amount of data

exchange is performed between different TRXs in the cabinet. Frequency hopping bus isintroduced to facilitate the data exchange. When the antenna hopping function is realized, each

TRX sends the TX frequency, TX ID, and data of the current frame to the frequency hopping

bus during timeslot interval. The TRX receives the corresponding frequency and data from the

frequency hopping bus, and then configure the RF based on the frequency. Then, the RF sends

the data to the MS over the Um interface.

Figure 48-1 shows the position of the frequency hopping bus in the BTS.

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Figure 48-1 Position of the frequency hopping bus in the BTS

TRX1

FH_BUS ANT

DBUS

TRXn

ANT

DBUS

48.3.2 Antenna Hopping Algorithm

This describes antenna hopping algorithm. Through the antenna hopping frequency list and the

ID algorithm, antenna hopping algor ithm ensures that the frequency and data of each frame on

the frequency hopping bus is unique and has a one-to-one relationship with the TRX number.

Build the antenna hopping frequency list based on the frequency information configured on theBSC side. The BTS searches for the frequency from the antenna hopping frequency list when it

needs to send antenna hopping frequency.

When calculating the antenna ID, enter the TRX number to calculate an offset based on the frame

number and timeslot number of the TRX number. And then obtain an unique antenna hopping

ID based on the offset. Figure 48-2 lists the procedures for transmitting the data in antenna

hopping.





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Figure 48-2 Procedures for transmitting the data in antenna hopping

Start

End

Update the antenna hopping

frequency list with frequencyhopping frequency list

Search for the

frequency from the antenna

hopping frequency list

Calculate the

antenna hopping ID

Transmit on the local TRX

Update the antenna


with non frequency


Receives the datato be transmitted

Send the data to the

frequency hopping bus

Antenna

hopping or not?

Frequency

hopping or not?

Yes

No

No

Yes

Figure 48-3 lists the procedures for receiving the data in antenna hopping.

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Figure 48-3 Procedures for receiving the data in antenna hopping

Start

Receive the data

No handlingNo

Yes

The data matches

the ID of the TRX?

Check for the data on

frequency hopping bus

End

Send the data to the MS

over the Um interface

48.4 Implementation

This describes how to configure and verify the antenna hopping.

48.4.1 Changing Non Antenna Hopping to Antenna HoppingThis describes how to change non antenna hopping to antenna hopping on the BSC6000 Local

Maintenance Terminal.

48.4.2 Changing Antenna Hopping to Non Antenna Hopping

This describes how to change antenna hopping to non antenna hopping on the BSC6000 Local


48.4.3 Verifying Antenna Hopping

This describes how to verify antenna hopping. Antenna hopping is invisible to the MS. To verify

antenna hopping, you need to use a spectrum analyzer to check whether the main BCCH

frequencies on the main BCCH TRX have continuos output signals. If the signals are

discontinuous, the antenna hopping is enabled.





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48.4.1 Changing Non Antenna Hopping to Antenna Hopping

This describes how to change non antenna hopping to antenna hopping on the BSC6000 Local


Prerequisite

Antenna hopping is mainly used the cells with poor radio propagation conditions and poor Um

interface quality.

Context

When baseband frequency hopping and antenna hopping are operating at the same time, adhere

to the following principles:

l The number of baseband frequency hopping groups must be the same as that of antenna

hopping groups.l The same TRX number must belong to the baseband frequency hopping group and the

antenna hopping group with the same group number.

Procedure

Step 1 On the Management Tree tab page of the BSC6000 Local Maintenance Terminal, right-click the cell to change Antenna Hopping, and then choose Configure Cell Attributes on the

shortcut menu. A dialog box is displayed, as shown in Figure 48-4.

Figure 48-4 Configuring Cells Attributes dialog box (1)

Step 2 Double-click the target cell in the Cell view list box to add it to the Selected cells list box.

Step 3 Click Next. A dialog box is displayed, as shown in Figure 48-5.

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Step 4 In the Cells to be set area, select the target cell, and then click Set Cell Properties. A dialog box is displayed, as shown in Figure 48-6.





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Figure 48-6 Set Cell Attributes dialog box

Step 5 Click Antenna Hopping. A dialog box is displayed. Set CELL Antenna Hopping toYESasshown in Figure 48-7.

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Figure 48-7 Configure Cell Antenna Hopping dialog box

Step 6 Click OK to return to the dialog box shown in Figure 48-6.


Step 8 Click Finish to complete the configuration.

----End

48.4.2 Changing Antenna Hopping to Non Antenna Hopping

This describes how to change antenna hopping to non antenna hopping on the BSC6000 Local


Procedure

Step 1 On the Management Tree tab page of the BSC6000 Local Maintenance Terminal, right-click

the cell to change Antenna Hopping, and then choose Configure Cell Attributes on theshortcut menu. A dialog box is displayed, as shown in Figure 48-8.





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Step 2 Double-click the target cell in the Cell view list box to add it to the Selected cells list box.

Step 3 Click Next. A dialog box is displayed, as shown in Figure 48-9.


Step 4 In the Cells to be set area, select the target cell, and then click Set Cell Properties. A dialog box is displayed, as shown in Figure 48-10.

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Figure 48-10 Set Cell Attributes dialog box

Step 5 Click Antenna Hopping. A dialog box is displayed. Set CELL Antenna Hopping to NO, asshown in Figure 48-11.





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Figure 48-11 Configure Cell Antenna Hopping dialog box



Step 8 Click Finish to complete the configuration.

----End

48.4.3 Verifying Antenna Hopping

This describes how to verify antenna hopping. Antenna hopping is invisible to the MS. To verify

antenna hopping, you need to use a spectrum analyzer to check whether the main BCCH

frequencies on the main BCCH TRX have continuos output signals. If the signals are

discontinuous, the antenna hopping is enabled.

48.5 Maintenance InformationThis lists the alarms related to antenna hopping.

Alarms

Table 48-3 lists the alarms related to antenna hopping.

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Table 48-3 Alarms related to antenna hopping.

Alarm ID Alarm Name

4114 Interior I/O Alarm

2126 TRX Interior I/O Alarm

3584 DRU Interior I/O Alarm

Counters

None

48.6 References

l GSM 05.02 V7.0.0 (1999-03)

Digital cellular telecommunications system (Phase 2+); Multiplexing and multiple access

on the radio path

l GSM 05.02 V7.0.0 (1999-03)

Digital cellular telecommunications system (Phase 2+); Channel coding





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01-48 antenna hopping

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