8/19/2019 01-48 Antenna Hopping
1/16
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
48-1
8/19/2019 01-48 Antenna Hopping
2/16
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
48 Antenna Hopping
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
48-2 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 03 (2008-01-25)
8/19/2019 01-48 Antenna Hopping
3/16
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
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
48-3
8/19/2019 01-48 Antenna Hopping
4/16
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.
48 Antenna Hopping
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
48-4 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 03 (2008-01-25)
8/19/2019 01-48 Antenna Hopping
5/16
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.
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
48-5
8/19/2019 01-48 Antenna Hopping
6/16
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
hopping frequency list
with non frequency
hopping frequency list
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.
48 Antenna Hopping
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
48-6 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 03 (2008-01-25)
8/19/2019 01-48 Antenna Hopping
7/16
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
Maintenance Terminal.
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.
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
48-7
8/19/2019 01-48 Antenna Hopping
8/16
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
Maintenance Terminal.
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.
48 Antenna Hopping
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
48-8 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 03 (2008-01-25)
http://-/?-
8/19/2019 01-48 Antenna Hopping
9/16
Figure 48-5 Configuring Cells Attributes dialog box (2)
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.
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
48-9
8/19/2019 01-48 Antenna Hopping
10/16
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.
48 Antenna Hopping
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
48-10 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 03 (2008-01-25)
http://-/?-
8/19/2019 01-48 Antenna Hopping
11/16
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 7 Click OK to return to the dialog box shown in Figure 48-5.
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
Maintenance Terminal.
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.
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
48-11
http://-/?-
8/19/2019 01-48 Antenna Hopping
12/16
Figure 48-8 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 48-9.
Figure 48-9 Configuring Cells Attributes dialog box (2)
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.
48 Antenna Hopping
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
48-12 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 03 (2008-01-25)
8/19/2019 01-48 Antenna Hopping
13/16
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.
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
48-13
http://-/?-
8/19/2019 01-48 Antenna Hopping
14/16
Figure 48-11 Configure Cell Antenna Hopping dialog box
Step 6 Click OK to return to the dialog box shown in Figure 48-10.
Step 7 Click OK to return to the dialog box shown in Figure 48-9.
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.
48 Antenna Hopping
HUAWEI BSC6000 Base Station Subsystem
BSS Feature Description
48-14 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 03 (2008-01-25)
8/19/2019 01-48 Antenna Hopping
15/16
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
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
48-15
http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-
8/19/2019 01-48 Antenna Hopping
16/16