How to Balancing the DSP Data Resources in BSC

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1NPI PROCEDURE GUIDELINES How to Balancing the DSP Data Resources in BSC

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Network and Service Quality ManagementConfidential1

Introduction

As example in BSC Solobaru1 BSC Device Panel is shown in the left figure. And by collecting DPU Load Data before, Pivot Result is correct with the actual DPU Board which installed in this BSC.

Yellow Boxes in the BSC Device Panel are the recommended Slots which usually installed for DPU.

This topic will guide us to Balancing the PDCH in each DSP, in order to Balancing the DSP Utilization Resources in BSC.

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Purpose of BalancingDSP Utilization (%) shown that in each slot of DSP capacity has a maximum number. For DPUd only maximum 45 PDCH each DSP, from 0 to 20, and DSP 21 suggested 0 value for synchronization. And DPUg can handle 75 PDCH, but only from 0 to 13 DSP.

Balancing is needed, for example for Subrack 1, which slot 8 & 9 are very crowded, but for slot 10 just a few. This activity is recommended, to keep the PDCH performance in each DPU Board, maintaining in good performance.

Lets take an example for DPUg in Subrack 1, in the next slide.


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Example of Balancing one Cell Using this Command DSP PSRES, we can choose an example of Subrack 1 Slot 0 of DSP 0 which highly crowded with 88% max PDCH occupied.

When finished execute that Command, many of PDCH will be shown like in the figure. Find the Cell Index and the Channel State of PDCH. When the Channel State goes Unavailable, that means PDCH in current Cell, would be Failure (become red color), the impact is cannot handle Payload.


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Example of Balancing one Cell At the first step we check the Subrack 1 Slot 8 of DSP No. 0, then we choose one of Cell Index, for instance Cell Index 39 which had 11 PDCHs will be relocated to Subrack 1 Slot 10 DSP No. 3 .

We need to check the avaibility PDCH on destination DSP, showed that only 13 PDCHs on those DSP.

So, the number PDCH in this DSP would be approximate of 24 PDCHs (13 + 11) when Cell Index 39 relocated to this DSP.


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Example of Balancing one Cell Type Command SET PSCELLTODSP , put the immediate Cell Index or Cell Name, and the destination of DSP.

When Confirm Box appeared, Choose OK to continue.

Then check again in Subrack 1 Slot 10 DSP No. 3 which Cell Index 39 had been relocated to this DSP.

The PDCH number is increasing become 25 PDCHs at the moment.

Finally, we learn how to Balancing the DSP (DPU Load).


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Example of Balancing After Add DPU



Display PS Resources(DSP PSRES)FunctionUse this command to display information about PS resources.Note1. This command applies to only 2G cells in the PS domain.2. This command can be used in built-in PCU mode only.ParametersParameter IDParameter NameParameter Description

IDXTYPEIndex TypeMeaning: Query type. The query can be based on DSP, slot or subrack. To query the GPRS cell attributes by DSP, you can only choose a DPU board whose logic function type is GPCU.

GUI Value Range: BYDSP(By DSP), BYSLOT(By Slot), BYSUBRACK(By Subrack)

Unit: None

Actual Value Range: BYDSP, BYSLOT, BYSUBRACK

MML Default Value: None

Recommended Value: None

Parameter Relationship: None

Service Interrupted After Modification : Not involved

Impact on Network Performance: None

SRNSubrack No.Meaning: Number of the subrack

GUI Value Range: 0~11

Unit: None

Actual Value Range: 0~11




Service Interrupted After Modification : No (No impact on the UE in idle mode)


SNSlot No.Meaning: Number of the slot


Unit: None







DSPNODSP No.Meaning: Number of the Digital Signal Processing (DSP) in the DPU board. The DSP NO.'s value range of DPUb and DPUd board is 0~21 and that of DPUg board is 0~13.


Unit: None





Service Interrupted After Modification : Not involved


ExampleTo query the PS resources of subrack 0, run the following command:DSP PSRES: IDXTYPE=BYSUBRACK, SRN=0;

The result is as follows:%%DSP PSRES: IDXTYPE=BYSUBRACK, SRN=0;%%RETCODE = 0 Execution succeeded.

Query PS resources---------- Slot No. DSP No. Cell Index Cell Um Administration State Cell Gb Administration State TRX No. Channel No. Channel State

8 5 1 Unblocked Blocked 1 5 Unavailable 8 4 0 Unblocked Unblocked 0 5 Available (Number of results = 2)

--- ENDOutput DescriptionDomain NameDescription

Slot No.Number of the slot where the DPU processing GPRS-cell-related services is located

DSP No.Number of the DSP on the DPU processing GPRS-cell-related services

Cell IndexIndex of a 2G cell

Cell Um Administration StateThe cell Um administration state can be Blocked or Unblocked. Blocked: The Um interface of the cell is blocked manually or faulty.

Cell Gb Administration StateThe cell Gb administration state can be Blocked or Unblocked. Blocked: The Gb interface of the cell is blocked manually or faulty.

TRX No.Number of the TRX in the BTS

Channel No.Number of the channel in the TRX

Channel StateThe channel can be in unavailable state or available state.

Set PS Cell Distribution on DSP(SET PSCELLTODSP)FunctionUse this command to re-allocate the general packet radio service (GPRS) cell on the DSP.Note1. To bind a GPRS cell to a specific DSP, you can only choose a DPU board whose logic function type is GPCU.2. This command applies to only 2G cells in the PS domain.3. After running this command, you can use DSP PSCELL to query the allocation result.4. This command can be used in built-in PCU mode only.ParametersParameter IDParameter NameParameter Description

IDXTYPEIndex TypeMeaning: Index type, supporting the index based on the cell and BSC mode.

GUI Value Range: BYCELL(By Cell), BYBSC(By BSC)

Unit: None

Actual Value Range: BYCELL, BYBSC






IDTYPEIndex TypeMeaning: Subscribers can specify the cell according to the index or the name.

GUI Value Range: BYNAME(By Name), BYID(By Index)

Unit: None

Actual Value Range: BYNAME, BYID






CELLIDCell IndexMeaning: Index of a cell, uniquely identifying a cell in a BSC.GSM cells are uniquely but not necessarily consecutively numbered within a BSC. For example, you can number a GSM cell 0 and number another GSM cell 3.


Unit: None







CELLNAMECell NameMeaning: Name of a cell. This parameter uniquely identifies a cell in a BSC.Cell names cannot contain the following invalid characters:, ; = " ' In addition, cell names cannot contain two or more consecutive %, two or more consecutive spaces, or more than two consecutive +.

GUI Value Range: None

Unit: None

Actual Value Range: 1~64 characters






SRNSubrack No.Meaning: Number of the subrack


Unit: None







SNSlot No.Meaning: Number of the slot


Unit: None







DSPNODSP No.Meaning: Target DSP number. The DSP NO.'s value range of DPUb and DPUd board is 0~21 and that of DPUg board is 0~13.


Unit: None




Parameter Relationship: This parameter is valid only when IDXTYPE is set to BYCELL.

Service Interrupted After Modification : Yes


Example1. To allocate cell 0 to DSP 0 in slot 8 of subrack 0, run the following command:SET PSCELLTODSP: IDXTYPE=BYCELL, IDTYPE=BYID, CELLID=0, SRN=0, SN=8, DSPNO=0;

2. To set the parameters related to the distribution of all GPRS cells (Index Type = BYBSC), run the following command:SET PSCELLTODSP: IDXTYPE=BYBSC;

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How to Balancing the DSP Data Resources in BSC