Configuring the DBS3900 in S2/2/2 Mode

This describes how to add a DBS3900 GSM in S2/2/2 mode for the BSC and configure its attributes, logical TRXs, and cell attributes.

Scenario	Initial configuration of a new BTS
Mandatory/Optional	Mandatory
NEs Involved	DBS3900 GSM

NOTE:

• For the parameters not mentioned in this section, retain the default values during the initial configuration.
• Abis interface boards are classified into the GEIUB, GOIUB, GEHUB, GFGUB, and GOGUB.

Prerequisites

Preparation

Figure 1 shows the typical RF cable connection of the DBS3900 GSM in S2/2/2 mode.

Figure 1 RF cable connection of the DBS3900 in S2/2/2 mode

The corresponding BTS parameters are described in Table 1.

Table 1 Parameter settings in the case of RF cable connection in S2/2/2 mode

Parameter		Parameter Value
Active		Deselected
Ring Mode		No
Number of Cells		3
Number of RXU Chains		3
Cable connection of the BBU and RRU		Star Topology
Number of DRRUs		3
Chain Type		Chain
Chain No. and Chain Head Board Port of RRU0	Chain No.	0
	Chain Head Board Port	0
Chain No. and Chain Head Board Port of RRU1	Chain No.	1
	Chain Head Board Port	1
Chain No. and Chain Head Board Port of RRU2	Chain No.	2
	Chain Head Board Port	2
TX/RX mode in the DRRU board attributes		Double Feeder (2TX + 2RX)
RF RX/TX mode	Receive Mode	Main Diversity
	Send Mode	No Combining
Power Type		15W
TMA		None
Frequency Hopping		None

Procedure

1. On the BSC6000 Local Maintenance Terminal, right-click the GEIUB interface board of the GMPS or GEPS, and then choose Add Site from the shortcut menu. A dialog box is displayed, as shown in Figure 2.
   Figure 2 Add Site dialog box (1)
   
   

2. Click Add Site. A dialog box is displayed, as shown in Figure 3.
   Figure 3 Add New Site dialog box
   
   

3. Set Site Type to DBS3900 GSM, Ring Mode to NO, and set other parameters listed in Table 2.

   Table 2 Parameters to be configured in the Add New Site dialog box

   Site Index	Site Name	Site Type
   Upper-Level Port No.	Multiplexing Mode	FlexAbis Mode

4. Click OK. A dialog box is displayed, as shown in Figure 4.
   Figure 4 Add Site dialog box (2)
   
   

5. Click Next. A dialog box is displayed, as shown in Figure 5.
   Figure 5 Add Site dialog box (3)
   
   

6. Select a BTS, and then click Add Cell. A dialog box is displayed, as shown in Figure 6.
   Figure 6 Add New Cell dialog box
   
   

7. Set Number of Cells to 3, and set other parameters.
   CAUTION:

   If the frequency band is not configured correctly, you must delete the configured cell or BTS and then add a cell or BTS for modifying the frequency band. The reason is that a frequency band cannot be modified in a configured cell or BTS.

8. Click OK. A dialog box is displayed, as shown in Figure 7.
   Figure 7 Add Site dialog box (4)
   
   

9. Click Next. A dialog box is displayed, as shown in Figure 8.
   Figure 8 Add Site dialog box (5)
   
   

10. Click Site Attributes. A dialog box is displayed, as shown in Figure 9.
    Figure 9 Site Device Attributes dialog box (1)
    
    

11. Configure the RXU chain and DRRU.
    1. In the Site Device Attributes dialog box, right-click and choose Add RXU Chain from the shortcut menu. A dialog box is displayed, as shown in Figure 10.
       Figure 10 Add RXU Chain dialog box
       
       

    2. Set Chain No., Chain Type, and Chain Head Board Port according to Table 1.
    3. Click OK. The RXU chain is added successfully, as shown in Figure 11.
       Figure 11 Added RXU chain
       
       

    4. Right-click the RXU chain, and then choose Add RXU > Add DRRU. A dialog box is displayed, as shown in Figure 12.
       Figure 12 Add DRRU dialog box
       
       

    5. Set RXU NAME and RXU No..
       NOTE:

       RXU NAME of different DRRUs under the same BTS must be unique. Otherwise, the system may display error information.

    6. Click OK. The DRRU chain is added, as shown in Figure 13.
       Figure 13 Site Device Attributes dialog box (2)
       
       

    7. Right-click the DRRU, and then choose Configure RXU Attribute. A dialog box is displayed, as shown in Figure 14.
       Figure 14 Basic Attributes of Site Board dialog box
       
       

    8. Click the Configure Site Board Attributes tab to display the tab page, as shown in Figure 15.
       Figure 15 Basic Attributes of Site Board dialog box
       
       

    9. Set Send Receive Mode to Double Feeder (2TX + 2RX).
       NOTE:

       When two TRXs are bound in the DRRU and the required power type is 30 W, 25 W, or 12 W, the RX/TX mode of the DRRU must be set to Double Feeder (2TX + 2RX) or Double Feeder (2TX + 4RX).

    10. Click OK to return to the dialog box, as shown in Figure 13.
    11. Right-click the DRRU, and then choose Binding logical TRX from the shortcut menu. A dialog box is displayed, as shown in Figure 16.
        Figure 16 Binding Logical TRX dialog box
        
        

    12. Select two TRXs and the cells allocated to them, and set TRX numbers according to the data provided by the network planning department.
        NOTE:

        When the DBS3900 is in S2/2/2 mode, one DRRU corresponds to one cell. Therefore, the two logical TRXs that are bound to one DRRU belong to the same allocated cell.

    13. Click OK to return to the dialog box, as shown in Figure 13.
    14. Repeat 11.a through 11.m to configure the other two RXU chains and the DRRU under this chain. The final configuration result is shown in Figure 17.
        Figure 17 Configuration result of RXU chains and DRRUs of a DBS3900 in S2/2/2 mode
        
        

12. Add other modules to subrack 2 in the Site Device Attributes dialog box. For details, see Adding BTS Modules.
13. Click OK to return to the dialog box, as shown in Figure 8.
14. Click Next. A dialog box is displayed, as shown in Figure 18.
    Figure 18 Add Site dialog box (6)
    
    

15. Select the added cell, and then click Cell Attributes. A dialog box is displayed, as shown in Figure 19.
    Figure 19 Set Cell Attributes dialog box
    
    
    NOTE:

    • For two cells, the values of at least one of the following parameters should be different: MCC, MNC, LAC, and CI.

16. In the TRX Attributes group box, select the allocated TRXs, as shown in Figure 20.
    Figure 20 TRX Attributes group box
    
    

17. Click Frequency Config. A dialog box is displayed, as shown in Figure 21. Then, select a frequency.
    Figure 21 Set Cell Frequency dialog box
    
    

18. Click OK to return to the dialog box, as shown in Figure 19.
19. Click TRX Config. A dialog box is displayed, as shown in Figure 22.
    Figure 22 Configure TRX Attributes dialog box
    
    

20. Move a frequency corresponding to the TRX from Available Frequencies to Assigned Frequencies.
21. Click the Channel Attributes tab. A tab page is displayed, as shown in Figure 23. Then, set the channel types corresponding to the channel numbers.
    Figure 23 Channel Attributes tab page
    
    

22. Click the Device Attributes tab. A dialog box is displayed, as shown in Figure 24.
    Figure 24 Device Attributes tab page
    
    

23. Set Power Type, Send Mode, and Receive Mode according to Table 1.
    NOTE:

    • The power types that can be configured for the DRRU are 12 W, 15 W, 25 W, and 30 W.
    • When two logical TRXs are bound in the DRRU, the power of each logical TRX can only be set to "15W". Otherwise, the system may display error information.
    • When Send Mode is set to "Transmitter Independent or Combining", the system determines whether to apply send mode "Transmitter Independent" or "Combining" according to the receive and send modes of the antenna and the binding logical TRX.

24. Click OK to return to the dialog box, as shown in Figure 19.
25. Repeat 19 through 24 until the frequencies of all the TRXs, channel attributes, and device attributes in a cell are configured.
26. Click OK to return to the dialog box, as shown in Figure 18.
27. Repeat 15 through 26 until the attributes of all the cells are configured.
28. Click Finish. The configuration of the BTS is complete.
29. Activating a BTS.
    1. On the Management Tree tab page of the BSC6000 Local Maintenance Terminal, right-click the target BTS and choose Site Operation > Set Site Active State from the shortcut menu. A dialog box is displayed, as shown in Figure 25.
       Figure 25 Set Site Active State dialog box
       
       

    2. Under Site Active State, select Activated. Then, click Finish to complete the BTS activation.