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1、TIA/EIA TELECOMMUNICATIONS SYSTEMS BULLETIN Assignment of Access Over load Classes in the Cellular lelecommunications Services T SB 16-A (Revision of TSB 16) JUNE 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Tlie Telecoininiiiiicatioiis Industry Associatioii represents tlie communications sector of
2、Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:05:02 MDTNo reproduction or networking permitted without license from IHS -,-,- NOTICE TIMEIA Engineering Standards and Publicati
3、ons are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need.
4、 Existence of such Standards and Publications shall not in any respect preclude any member or nonmember of TIA/EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by thos
5、e other than TIMEIA members, whether the standard is to be used either domestically or internationally. Standards, Publications and Bulletins are adopted by EIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, TIA/EIA does not assume any liability to
6、 any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Publication, or Bulletin. Technical Bulletins are distinguished from TIMEIA Standards or Interim Standards, in that they contain a compilation of engineering data or information useful to the technical co
7、mmunity, and represent approaches to good engineering practices that are suggested by the formulating committee. This Bulletin is not intended to preclude or discourage other approaches that similarly represent good engineering practice, or that may be acceptable to, or have been accepted by, approp
8、riate bodies. Parties who wish to bring other approaches to the attention of the formulating committee to be considered for inclusion in future revisions of this Bulletin are encouraged to do so. It is the intention of the formulating committee to revise and update this Bulletin from time to time as
9、 may be occasioned by changes in technology, industry practice, or government regulations, or for other appropriate reasons. (From Project No. 4864, formulated under the cognizance of the TIA TR-45.1 Subcommittee on Analog Technology Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 200 1 Standar
10、ds and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 PRICE: Please refer to the current Catalog of ELECTRONIC INDUSTRIES ALLIANCE STANDARDS and ENGINEERING PUBLICATIONS or call Global Engineering Documents, USA and Canada (1-800-854-7179) International (303-397-7956) All rights res
11、erved Printed in U. S. A. Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:05:02 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Telecommunica
12、tions Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:05:02 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Telecommunications Industry Association Provided by IHS under
13、license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:05:02 MDTNo reproduction or networking permitted without license from IHS -,-,- TIAIEINTSB 16-A 1. Introduction This Engineering Bulletin defines a method for the uniform use of Access Overload Classes
14、 so that roamers receive the same overload treatment as home mobile stations. This bulletin also provides a definition of an Authorized Emergency Mobile Station. The actual mechanism to implement overload control may differ for analog and digital air interfaces. See the current revision of the relev
15、ant air interface standard (TIA/EIA-553, TIA/EIA-136 or TIA/EIA/IS-2000) for the actual requirements and procedures beyond those described in FCC OST Bulletin 53. 2. Definitions ACCOLCp A four-bit number used to identify which overload class field controls access attempts. The “p“ indicates that thi
16、s value is set in the mobile stations permanent security and identification memory. The values for ACCOLCp defined in Section 3 apply for all TIA TR-45 air interfaces. Authorized Emergency Mobile Station An Authorized Emergency Mobile Station is a Mobile Station with an ACCOLCp value of 11. Base Sta
17、tion A station in the Cellular Radiotelephone Service, other than a mobile station, used for radio communications with mobile stations. Load Shedding The act of denying Mobile Stations access to a Base Station, typically for the purpose of preventing more traffic from being presented to the Base Sta
18、tion than it can process. Mobile Station A station in the Cellular Radiotelephone Service intended to be used while in motion or during halts at unspecified points. It is assumed that mobile stations include portable units (e.g., hand- held personal units) as well as units installed in vehicles. Ove
19、rload Control Global Action Message A single word global action message containing sixteen overload class fields (OLC N, N = O to 15). i Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/
20、2007 20:05:02 MDTNo reproduction or networking permitted without license from IHS -,-,- TIAIEIAITSB 16-A 1 5 1 4 1 3 1211109876543210 3. Use of Overload Control Classes The cellular protocol adopted by the FCC (see OST Bulletin 53) provides a means of load shedding when a system is overloaded, by de
21、nying access requests for service. Each mobile station is assigned one of 16 slots, or number designations, called ACCOLCp (see OST Bulletin 53 Section 2.3.5, pgs. 2-7). A system may transmit an Overload Control Global Action Message, (see OST Bulletin 53 Section 3.7.1.2.2, pgs. 3-17), in which each
22、 of the 16 slots can be marked 1” or O”. A mobile station must examine this message (see OST Bulletin 53 Section 2.6.3.4, pgs. 2- 16), and may attempt access if its slot is marked “1”. In order for the overload control capabilities to remain useful in systems that are providing services to roamers,
23、industry-wide uniformity in the assignment of the overload control bits is necessary. The following assignments are proposed: Bits O through 9 will be used for the uniform distribution of assignments to Mobile Stations. One possible method for assigning the bits in a uniform manner is to make the bi
24、t correspond to the decimal value of the least significant digit in the mobile terminals directory number. Bit 10 will be used for the system test purposes Bit 11 will be used for Authorized Emergency Mobile Stations. Bits 12 through 15 will remain unused and reserved for future assignment. Thus, th
25、e normal subscriber traffic on the system can be divided into ten (10) relatively equal pools. Traffic offered could then be controlled in 10% increments which should prove to be a fine enough control to affect overload conditions without creating system oscillation. All existing Mobile Stations wit
26、h overload control bits already assigned will be “grandfathered“ into the system until they are brought in for another service reason. Authorized Emergency Mobile Stations are typically defined as: Any Mobile Station operated by a federal, state, provincial, county, or municipal law enforcement agen
27、cy, used by sworn police officers in Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:05:02 MDTNo reproduction or networking permitted without license from IHS -,-,- TIAIEIAITSB
28、16-A fulfillment of the law enforcement mission of the agency as defined within its charter. Any Mobile Station operated by a federal, state, provincial, county, or municipal fire department or incorporated fire district, used by members of the department (or district) in fulfillment of the fire pre
29、vention and/or fire fighting mission as defined within its charter. Any Mobile Station operated by a federal, state, provincial, county, or municipal agency used by that agency in the provision of emergency medical services and/or rescue services authorized by the charter of the agency. 3 Copyright
30、Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:05:02 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Telecommunications Industry Association Provided
31、by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:05:02 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employe
32、es/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:05:02 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:05:02 MDTNo reproduction or networking permitted without license from IHS -,-,-