1、 ATIS-0500018 ATIS Standard on - P-ANI ALLOCATION TABLES FOR ESQKS, ESRKS, AND ESRDS As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys most-pressing business priorities. Through ATIS committees and forums, nearl
2、y 200 companies address cloud services, device solutions, emergency services, M2M communications, cyber security, ehealth, network evolution, quality of service, billing support, operations, and more. These priorities follow a fast-track development lifecycle from design and innovation through solut
3、ions that include standards, specifications, requirements, business use cases, software toolkits, and interoperability testing. ATIS is accredited by the American National Standards Institute (ANSI). ATIS is the North American Organizational Partner for the 3rd Generation Partnership Project (3GPP),
4、 a founding Partner of oneM2M, a member and major U.S. contributor to the International Telecommunication Union (ITU) Radio and Telecommunications sectors, and a member of the Inter-American Telecommunication Commission (CITEL). For more information, visit . Notice of Disclaimer each WSP has its own
5、 pool of ESRKs per PSAP. ESRKs are not shared among multiple WSPs. The WSPs acquire ESRKs and then delegate management responsibility to the MPC. Functionally, ESRKs and ESQKs operate the same way. Like ESQKs, ESRKs are generally assigned in pools, except that with ESRKs, each WSP has a pool of thei
6、r own ESRKs. ESRDs are also unique to wireless carriers, but they are employed in a different manner than ESRKs. An ESRD identifies a specific cell sector for a designated PSAP. P-ANIs may also be used as Reference Identifiers for SMS to 9-1-1 when a PSAP chooses the TTY interwork function for deliv
7、ery of SMS to 9-1-1. A Text Control Center (TCC) may use either ESQKs or ESRKs as Reference Identifiers. Either application of p-ANIs is acceptable. This allocation model would provide general industry guidance with regards to the quantity of ESQKs, ESRKs, and ESRDs assigned to an Eligible User by a
8、ny entity (carrier or p-ANI administrator) that is allocating these non-dialable resources. The intent is to provide a quantity that is a guideline not an absolute maximum. Eligible Users who request quantities of ESQKs in excess of the guideline quantity would be expected to provide additional docu
9、mentation that could include more detailed statistical-based models and real-world experience on ESQK usage within certain geographic areas, to support their request for such additional numbers. It should be noted that technology convergence is already blurring the lines between the three types of p
10、-ANIs. For example, some wireless calls that originate on femtocells may be routed via the IP network of a VPC using ESQKs. Applications such as this may constitute justification for requesting more or less p-ANIs than the standard formulas suggest. ATIS-0500018 2 1.3 Application This standard focus
11、es on the development of a pseudo Automatic Number Identification (p-ANI) allocation model to be used by Wireless Carriers, VoIP Service Providers (VSPs) and VoIP Positioning Centers (VPCs) to determine the quantity of p-ANIs to be assigned to an Eligible User for use as ESQKs, ESRKs, or ESRDs. The
12、standard helps to ensure the efficient and effective use of p-ANI resources for ESRK purposes and strives to define methods and algorithms for use by industry to follow that will result in assignment/allocation in a manner that will promote conservation of these vital numbering resources, while meet
13、ing provisioning needs. 2 Acronyms & Abbreviations ALI Automatic Location Identification ATIS Alliance for Telecommunications Industry Solutions ECDR ESIF Emergency Call and Data Routing Subcommittee ESIF Emergency Services Interconnection Forum ESN Emergency Services Network ESQK Emergency Service
14、Query Keys ESRD Emergency Services Routing Digits ESRK Emergency Services Routing Key ESZ Emergency Services Zone GMLC Gateway Mobile Location Center HCAS Hybrid Call Associated Signaling MPC Mobile Positioning Center MSC Mobile Switching Center NCAS Non-Call Associated Signaling p-ANI pseudo Automa
15、tic Number Identification PSAP Public Safety Answering Point RNA Routing Number Authority TCC Text Control Center VPC VoIP Positioning Center VSP VoIP Service Provider WSP Wireless Service Provider 3 Allocation of P-ANI Resources Multiple p-ANI allocation models based on a variety of network and ope
16、rational factors were evaluated, but those models did not openly appear to add significant value to the tables proposed herein. However, those discussions were helpful in identifying some exceptions that an Eligible User may find useful when justifying why additional p-ANI number resources (beyond t
17、hose defined in the table) might become necessary. Although not a comprehensive list, reasonable exceptions might include: The eligible user may need to request a sufficient numbers of p-ANIs to enable for a one-for-one replacement of dialable numbers currently used as p-ANIs when migrating to non-d
18、ialable p-ANI number resources administered by the RNA. Where a PSAP and/or other E9-1-1 governing authority requires the use of a “guard timer” in excess of 10 minutes and the commercial solution is capable of employing guard timing, the number of requested p-ANIs will be substantially greater than
19、 shown in the tables. A “guard timer” is a technology device that prohibits the reuse of p-ANI sooner than the timer expiration period. ATIS-0500018 3 Some ALI systems may cache the p-ANI and related MPC/GMLC responses for a specified length of time, which will result in the need for p-ANI quantitie
20、s in excess of those shown in the tables above. 4 ESRK, ESRD, & ESQK Allocation Tables for Routing Wireless E9-1-1 Calls The following tables should serve as an aid in determining a reasonable quantity of ESRKs, ESRDs, and ESQKs that might be required by an Eligible User in order to provide wireless
21、 E9-1-1 service. The tables below are also based on the following assumptions: 1) ALI system does not cache ESQK/ESRK and related VPC/MPC response. If the ALI does, additional ESQKs/ESRKs may be required. 2) The guard timer value is ten (10) minutes. 3) Call termination indication is not universally
22、 available. Where it is available, this may be the basis for calculating the requested number of ESQKs/ESRKs. Table 4. 1 - ESRK Allocation Table Voice Path Quantity1Reasonable Number of ESRKs per PSAP 1 4 5 5 9 10 10 -14 15 Etc. Table 4. 2 - ESRD Allocation Table Voice Path Quantity1Reasonable Numbe
23、r of ESRDs N/A 1 per cell sector Numerous variables were investigated that might affect the number of ESQKs required per PSAP per Eligible User. Because the purpose of this formula is to help guide in determining reasonableness and not to establish a definitive quantity, the simple table below is pr
24、ovided for guidance: 1Voice Path Quantity is defined as the number of voice paths between a wireless carriers Mobile Switching Center (MSC) and the selective router for a given PSAP, or the number of voice paths between the selective router and the PSAP used for wireless 9-1-1 call termination. The
25、lesser of the above should be used as the basis for determining ESRK allocation. ATIS-0500018 4 Table 4. 3 - ESQK Allocation Table Voice Path Quantity2Reasonable Number of ESQKs per PSAP 1 - 4 5 5 - 9 10 10 - 14 15 Etc. Multiple allocation models were developed based upon a variety of network and op
26、erational factors. Those models do not appear to add significant value to the table above but they do highlight some potential exceptions that an Eligible User may cite for requesting a different quantity of p-ANI. These exceptions include, but are not limited to: 1) For PSAPs requiring land-line ES
27、N equivalence, the number of p-ANI assigned should not be less than two (2) per ESN. 2) If the required call guard timer for a PSAP is greater than ten (10) minutes, the number of required ESQKs may be higher. 3) The technologies employed by various MPCs/VPCs to achieve system redundancy can vary. S
28、ome MPCs/VPCs may be unable to duplicate the same p-ANI in both redundant nodes, thus requiring twice the recommended quantities of ESRKs or ESQKs per PSAP. 2Voice Path Quantity is defined as the number of voice paths between a wireless carriers Mobile Switching Center (MSC) and the selective router for a given PSAP, or the number of voice paths between the selective router and the PSAP used for wireless 9-1-1 call termination. The lesser of the above should be used as the basis for determining ESQK allocation.
