access control(gbss14.0 01)
DESCRIPTION
Access control 3GTRANSCRIPT
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Access Control GBSS14.0
Feature Parameter Description
Issue 01
Date 2012-04-28
HUAWEI TECHNOLOGIES CO., LTD.
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Copyright Huawei Technologies Co., Ltd. 2012. All rights reserved.
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The purchased products, services and features are stipulated by the contract made between Huawei and
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within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements,
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Huawei Technologies Co., Ltd.
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Website: http://www.huawei.com
Email: [email protected]
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GSM BSS
Access Control Contents
Issue 01 (2012-04-28) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
ii
Contents
1 Introduction to This Document ............................................................................................. 1-1
1.1 Scope ............................................................................................................................................ 1-1
1.2 Intended Audience......................................................................................................................... 1-1
1.3 Change History .............................................................................................................................. 1-1
2 Overview of Access Control .................................................................................................. 2-1
3 Principles .................................................................................................................................... 3-1
4 Strategy ....................................................................................................................................... 4-1
5 Parameters.................................................................................................................................. 5-1
6 Counters ...................................................................................................................................... 6-1
7 Glossary ...................................................................................................................................... 7-1
8 Reference Documents ............................................................................................................. 8-1
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GSM BSS
Access Control 1 Introduction to This Document
Issue 01 (2012-04-28) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
1-1
1 Introduction to This Document
1.1 Scope
This document describes the concept, implementation, and technical principle of the access control feature.
The feature involved is GBFD-511002 Access Control Class(ACC).
1.2 Intended Audience
It is assumed that users of this document are familiar with GSM basics and have a working knowledge of GSM telecommunication.
This document is intended for:
Personnel working on Huawei GSM products or systems
System operators who need a general understanding of this feature
1.3 Change History
This section provides information on the changes in different document versions.
There are two types of changes, which are defined as follows:
Feature change:
Feature change: refers to the change in the access control feature of a specific product version.
Editorial change
Editorial change: refers to the change in wording or the addition of the information that was not described in the earlier version
Document Issues
The document issues are as follows:
01 (2012-04-28)
Draft A (2012-02-15)
01 (2012-04-28)
This is the first release of GBSS14.0.
Compared with issue draft A (2012-02-15) of GBSS14.0, issue 01 (2012-04-28) of GBSS14.0 has no change.
Draft A (2012-02-15)
This is the draft release of GBSS14.0.
Compared with issue 01 (2011-03-31) of GBSS13.0, issue Draft A (2012-02-15) of GBSS14.0 has no change.
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GSM BSS
Access Control 2 Overview of Access Control
Issue 01 (2012-04-28) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
2-1
2 Overview of Access Control
With the access control (ACC) feature, the BSC can control the number of MSs accessing the network at a certain time by allowing only the MSs of a certain ACC class to access the network. In this manner, the BSS overload or MSC overload caused by the simultaneous access of numerous MSs can be avoided. In addition, the ACC feature uses a sliding window mechanism to enable the MSs of all ACC classes to access the network. Thus, radio services are available for all MSs, especially in emergencies.
In emergencies such as during natural disasters, the traffic in the network increases sharply. The traffic may increase to an extent that exceeds the network capacity. In such a case, subscribers have difficulties in making calls, and the radio network may be down. To solve this problem, the ACC feature controls the number of MSs accessing the network in emergencies by allowing only the MSs of certain ACC classes to access the network. Thus, normal operation of the radio network is ensured.
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GSM BSS
Access Control 3 Principles
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Copyright Huawei Technologies Co., Ltd.
3-1
3 Principles
When registered in a GSM network, an MS is assigned a common ACC class, ranging from Class 0 to Class 9, Class 10 to emergency call, or a special ACC class, ranging from Class 10 to Class 15. The BSC indicates in the system messages the access classes of the MSs that are allowed to access the network. The ACC feature uses a window sliding mechanism to allow only the MSs of a certain ACC class to access the network at a certain time. The size and speed of the sliding window is specified in the ACCCTRLPY parameter.
There are 16 ACC classes. Class 0 to Class 9 are common classes and are specified for common voice and data services; Class 10 to emergency call, Class 11 to Class 15 are special classes and are specified for services such as emergency call. Currently, the BSC controls only the access of MSs of Class 0 to Class 9. The ACC feature is implemented by the MS, BSS, and MSC/VLR as a joint effort. The principles are as follows:
1. The access class of MSs of special classes is set to a high priority.
2. When an MSC/VLR is excessively overloaded and the access side of the MSC/VLR is congested, the BSC under the MSC/VLR controls the access of the MSs in certain cells. Only the MSs having high access priorities and certain MSs of common classes use the RACH to access the radio network.
3. The BSC broadcasts the class in which MSs are allowed to access a network.
4. The MS matches its class information stored in the SIM card and that in the broadcast information. If allowed, the MS uses the RACH to access the radio network. Otherwise, the access of the MS is barred.
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GSM BSS
Access Control 4 Strategy
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4-1
4 Strategy
When ACCCTRLEN is set to YES(Yes), the ACC feature is enabled in a cell. After the feature is enabled, the BSC determines the MSs allowed to access the network by sending the ACC classes through system messages according to the policy specified in ACCCTRLPY. If the current ACC policy is changed or the MS uses another policy, the BSC sends the ACC classes again through system messages.
The value range of ACCINDEX is 0 to 31. Each control policy is configured with ACCWPOS, ACCWSIZE, and ACCWSP. ACCWSP specifies the sliding speed of the ACC sliding window, ACCWPOS specifies the starting point of the ACC sliding window, and Access Control Window Size specifies the ACC sliding window size in an access control policy. MSs of the ACC access classes that are specified in the sliding window are not allowed to access the network. For example, if ACCINDEX is set to 1, ACCWPOS to 0, ACCWSIZE to 2, and ACCWSP to 120s, the MSs of Class 0 and Class 1 are barred from the radio network during the first period (first 120s); the MSs of Class 2 and Class 3 are barred from the radio network during the second period (second 120s), and so on. Figure 4-1 shows the time assignment principle.
Figure 4-1 Assignment of ACC classes by time
Time (ms)600480360240120
MS
Cla
ss
0
1
2
3
4
5
6
7
8
9
720
The description of Figure 4-1 is as follows:
The sliding window mechanism allows the BSC to send ACC classes based on ACCWSP and ACCWSIZE. In this manner, MSs in different ACC classes can access the radio network and radio services are available for all MSs even in emergencies.
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GSM BSS
Access Control 5 Parameters
Issue 01 (2012-04-28) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
5-1
5 Parameters
Table 5-1 Parameter description
Parameter ID NE MML Command Description
ACCCTRLEN BSC6900 SET GCELLCCBASIC Meaning: This parameter specifies whether the access control function is enabled in a cell. When the function is enabled, the BSC determines which MSs in the cell to be connected to the network by sending the ACC classes through system messages according to the specified policy in Access Control Policy.
GUI Value Range: NO(No), YES(Yes)
Actual Value Range: NO, YES
Default Value: NO(No)
Unit: None
ACCCTRLPY BSC6900 SET GCELLCCBASIC Meaning: This parameter specifies the index of the access control policy that is used in a cell.
GUI Value Range: 0~31
Actual Value Range: 0~31
Default Value: None
Unit: None
ACCINDEX BSC6900 ADD BSCACCCTRLP
MOD BSCACCCTRLP
RMV BSCACCCTRLP
Meaning: This parameter specifies the index of an access control (ACC) policy. It is used to identify an ACC policy.
GUI Value Range: 0~31
Actual Value Range: 0~31
Default Value: None
Unit: None
ACCWPOS BSC6900 ADD BSCACCCTRLP
MOD BSCACCCTRLP
Meaning: This parameter is used to specify the starting point of the ACC sliding window in an access control policy.
GUI Value Range: 0~9
Actual Value Range: 0~9
Default Value: 0
Unit: None
ACCWSIZE BSC6900 ADD BSCACCCTRLP
MOD BSCACCCTRLP
Meaning: This parameter is used to specify the ACC sliding window size in an access control policy. MSs of the ACC access classes that are specified in the sliding window are not allowed to access the network.
GUI Value Range: 1~10
Actual Value Range: 1~10
Default Value: 2
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GSM BSS
Access Control 5 Parameters
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Copyright Huawei Technologies Co., Ltd.
5-2
Parameter ID NE MML Command Description
Unit: None
ACCWSP BSC6900 ADD BSCACCCTRLP
MOD BSCACCCTRLP
Meaning: This parameter is used to specify the sliding speed of the ACC sliding window in an access control policy.
GUI Value Range: 15~7200
Actual Value Range: 15~7200
Default Value: 120
Unit: s
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GSM BSS
Access Control 6 Counters
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Copyright Huawei Technologies Co., Ltd.
6-1
6 Counters
There are no specific counters associated with this feature.
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GSM BSS
Access Control 7 Glossary
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Copyright Huawei Technologies Co., Ltd.
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7 Glossary
For the acronyms, abbreviations, terms, and definitions, see the Glossary.
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GSM BSS
Access Control 8 Reference Documents
Issue 01 (2012-04-28) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
8-1
8 Reference Documents
[1] BSC6900 Feature List
[2] BSC6900 Optional Feature Description
[3] BSC6900 GSM Parameter Reference
[4] BSC6900 GSM MML Command Reference
1 Introduction to This Document1.1 Scope1.2 Intended Audience1.3 Change HistoryDocument Issues01 (2012-04-28)Draft A (2012-02-15)
2 Overview of Access Control3 Principles1. The access class of MSs of special classes is set to a high priority.2. When an MSC/VLR is excessively overloaded and the access side of the MSC/VLR is congested, the BSC under the MSC/VLR controls the access of the MSs in certain cells. Only the MSs having high access priorities and certain MSs of common classes use the RA3. The BSC broadcasts the class in which MSs are allowed to access a network.4. The MS matches its class information stored in the SIM card and that in the broadcast information. If allowed, the MS uses the RACH to access the radio network. Otherwise, the access of the MS is barred.
4 StrategyFigure 4-1 Assignment of ACC classes by time
5 ParametersTable 5-1 Parameter description
6 Counters7 Glossary8 Reference Documents[1] BSC6900 Feature List[2] BSC6900 Optional Feature Description[3] BSC6900 GSM Parameter Reference[4] BSC6900 GSM MML Command Reference