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M900/M1800 Base Station Controller Feature Description
About This Chapter The following table lists the contents of this chapter. Title
Description
10.1Introduction
Introduces the application, availability, and restrictions of the SDCCH dynamic adjustment function.
10.2Function Configuration
Describes the configurations of the SDCCH dynamic adjustment function.
10.3Maintenance Information
Describes the maintenance information about the SDCCH dynamic adjustment function.
M900/M1800 Base Station Controller Feature Description
10 SDCCH Dynamic Adjustment
10.1 Introduction 10.1.1 Application SDCCH dynamic adjustment performs the following functions:
Optimizing the usage of the traffic channel and signaling channel
Reducing the SDCCH channel block
Mitigating the impact on system performance caused by SDCCH initial configuration
In the GSM system, most types of calls need to use signaling channel such as location update and point-to-point message. The voice and data calls also need to use the signaling channel for a short time when setting up a call. The number of signaling channels depends on the traffic model, the current traffic distribution, and the HO statistics. The following describes how the three factors influence the number of signaling channels.
The cells at the edge of the location areas have more location update services. So they need more SDCCHs than the general cells do.
The increase of messages also increases the requirement for SDCCHs.
When the number of the GSM users suddenly increases, many users cannot have access to the network. In this case, the TCHs are transformed into SDCCHs. Then most users can have access to the network, however, calling can still not be ensured.
SDCCH dynamic adjustment lowers the request for exactness of the quantity of the signaling channels and expands the system capacity.
10.1.2 Availability All the versions support SDCCH dynamic adjustment without additional software and hardware.
10.1.3 Restrictions SDCCH dynamic adjustment occupies the TCHs and thus lowers the traffic bearer capability of the cell.
10.2 Function Configuration 10.2.1 Configuration Process In dynamic configuration mode, set SD Dynamic Allocation Allowed to Yes. For details, see section 4.10 "Modifying Cell's Channel Management Parameter" in the M900/M1800 BSC Data Configuration Manual – Dynamic Configuration.
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Huawei Technologies Proprietary
Issue 01 (2006-09-20)
M900/M1800 Base Station Controller Feature Description
10 SDCCH Dynamic Adjustment
10.2.2 Parameters Figure 1.1 shows the parameters of the SDCCH dynamic adjustment. Figure 1.1 SDCCH dynamic adjustment parameters Name
Unit
Rang e
Default
Description
SD Dynamic Allocation Allowed
None
Yes and no
Yes
Whether to dynamically assign the SDCCH
Idle SD Thrsh.
None
0~63
2
When the number of the idle SDCCH is smaller than this parameter, the TCH can be adjusted to SDCCH.
Cell SD Maximum
None
0~255
The total number of SDCCHs and eight
It decides the maximum number of the SDCCHs in the cell.
TCH Min. Recovery Time
Second
60~3600
600
The minimum duration for the SDCCH to be switched back to TCH.
10.2.3 Typical Cases A certain cell has TRX0, TRX1 and TRX2. Timeslot 0 of TRX 0 is on the BCCH and Timeslot 1 is on the SDCCH/8. The other timeslots are on full-rate TCHs. SDCCH dynamic adjustment can timely change the number of SDCCHs according to the traffic volume. Step 1 Set SD Dynamic Allocation Allowed to Yes. Step 2 Set the parameters in the dialog box as shown in 10.2.2 IStep 1Figure 1.1.
When the number of idle SDCCHs is less than two, the system adjusts a proper full-rate TCH to eight SDCCHs to expand the SDCCH capacity. If the number of SDCCH is more than ten for a continuous period of time, the system switches eight SDCCHs back to full-rate TCHs.
To adjust the SDCCH as early as possible, set the number larger in Idle SD Thrsh..
To switch back to the TCH, set the value smaller in TCH Min. Recovery Time.
----End
10.3 Maintenance Information 10.3.1 Related Alarms None.
Issue 01 (2006-09-20)
Huawei Technologies Proprietary
3
M900/M1800 Base Station Controller Feature Description
10 SDCCH Dynamic Adjustment
10.3.2 Related Traffic Statistics Figure 1.1 shows the relevant traffic indexes. Figure 1.1 SDCCH dynamic adjustment performance indexes No.
Performance indexes
1
Times of TCH convert to SDCCH
2
Times of SDCCH convert to TCH
For details, see M900/M1800 BSC Traffic Statistic Manual.
