1、 TSB-16-B (Revision of TSB-16-A) June 2011Assignment of Access Overload Classes in the Cellular Telecommunications Services NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilita
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17、RECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF BUSINESS, LOSS OF PROFITS, LITIGATION, OR THE LIKE), WHETHER BASED UPON BREACH OF CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DA
18、MAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA TSB-16-B Page 1 1. Introduction 1 This Engineering Bulletin defines a method for the uniform use of Access Overload Clas
19、ses so 2 that roamers receive the same overload treatment as home mobile stations. This bulletin also 3 provides a definition of an Authorized Emergency Mobile Station. 4 The actual mechanism to implement overload control may differ for analog and digital air 5 interfaces. See the current revision o
20、f the relevant air interface standard (TIA/EIA-553, 6 TIA/EIA/IS-2000, TIA/EIA-136) for the actual requirements and procedures beyond those 7 described in FCC OST Bulletin 53. 8 2. Definitions 9 ACCOLCp 10 A four-bit number used to identify which overload class field controls access 11 attempts. The
21、 “p” indicates that this value is set in the mobile stations permanent 12 security and identification memory. The values for ACCOLCp defined in Section 3 13 apply for all TIA TR-45 air interfaces. 14 Authorized Emergency Mobile Station 15 An Authorized Emergency Mobile Station is a Mobile Station wi
22、th an ACCOLCp 16 value of 11. 17 Authorized National Security/Emergency Preparedness (NS/EP) Mobile Station 18 An Authorized National Security/Emergency Preparedness (NS/EP) Mobile Station is 19 a Mobile Station with an ACCOLCp value of 12. 20 Base Station 21 A station in the Cellular Radiotelephone
23、 Service, other than a mobile station, used for 22 radio communications with mobile stations. 23 Load Shedding 24 The act of denying Mobile Stations access to a Base Station, typically for the purpose 25 of preventing more traffic from being presented to the Base Station than it can 26 process. 27 M
24、obile Station 28 A Station in the Cellular Radiotelephone Service intended to be used while in motion 29 or during halts at unspecified points. It is assumed that mobile stations include 30 portable units (e.g., hand-held personal units) as well as units installed in vehicles. 31 TIA TSB-16-B Page 2
25、 Overload Control Global Action Message 1 A single word global action message containing sixteen overload class fields (OLC 2 N, N = 0 to 15). 3 3. Use of Overload Control Classes 4 The cellular protocol adopted by the FCC (see OST Bulletin 53) provides a means of load 5 shedding when a system is ov
26、erloaded, by denying access requests for service. Each mobile 6 station is assigned one of 16 slots, or number designations, called ACCOLCp (see OST Bulletin 7 53 Section 2.3.5, pgs. 2-7). A system may transmit an Overload Control Global Action Message, 8 (see OST Bulletin 53 Section 3.7.1.2.2, pgs.
27、 3-17), in which each of the 16 slots can be marked 9 “1” or “0”. A mobile station must examine this message (see OST Bulletin 53 Section 2.6.3.4, 10 pgs. 2-16), and may attempt access to the overload control bits is necessary. 11 The following assignments are proposed: 12 MSB LSB 13 15 14 13 12 11
28、10 9 8 7 6 5 4 3 2 1 0 14 15 16 17 18 Bits 0 through 9 will be used for the uniform distribution of assignments to Mobile Stations. 19 One possible method for assigning the bits in a uniform manner is to make the bit correspond to 20 the decimal value of the least significant digit in the mobile ter
29、minals directory number. 21 Bit 10 will be used for the system test purposes. 22 Bit 11 will be used for Authorized Emergency Mobile Stations. 23 Bit 12 will be used for Authorized National Security/Emergency Preparedness Mobile Stations. 24 Bits 13 through 15 will remain unused and reserved for fut
30、ure assignment. 25 Thus, the normal subscriber traffic on the system can be divided into ten (10) relatively equal 26 pools. Traffic offered could then be controlled in ten percent (10%) increments which should 27 proved to be a fine enough control to affect overload conditions without creating syst
31、em 28 oscillation. 29 Reserved Uniform distribution class Test Mobile Station Authorized Emergency mobile Station Authorized NS/EP mobile Station TIA TSB-16-B Page 3 All existing Mobile Stations with overload control bits already assigned will be “grandfathered” 1 into the system until they are brou
32、ght in for another services reason. 2 Authorized Emergency Mobile Stations are typically defined as: 3 Any Mobile Station operated by a federal, state, provincial, county, or municipal law 4 enforcement agency, used by sworn police officers in fulfillment of the law 5 enforcement mission of the agen
33、cy as defined within its charter. 6 Any Mobile Station operated by a federal, state, provincial, county, or municipal fire 7 department or incorporated fire district, used by members of the department (or 8 district) in fulfillment of the fire prevention and/or fire fighting mission as defined 9 wit
34、hin its charter. 10 Any Mobile Station operated by a federal, state, provincial, county, or municipal 11 agency used by that agency in the provision of emergency medical services and/or 12 rescue services authorized by the charter of the agency. 13 Authorized National Security/Emergency Preparedness
35、 mobile stations are defined as: 14 Any Mobile Stations authorized by the National Communications Service (NCS) and 15 operated by governmental, military, civil authorities and other essential users of 16 public telecommunications networks who have a need for essential 17 telecommunication services including voice, data, video, and multimedia in crisis and 18 disaster situations. 19 20
