1、 TIA-664.531-B (Revision of TIA-664.531-A) October 2007Wireless Features Description: Network Directed System Selection (NDSS) ANSI/TIA-664.531-B-2007 APPROVED: OCTOBER 23, 2007 REAFFIRMED: JANUARY 30, 2013 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest t
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19、9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 531-i Contents Wireless Features Description: Network Directed System Selection Contents Revision Historyii 1 Network Directed System Selection (
20、NDSS) .1 1.1 Normal Procedures with Successful Outcome1 1.2 Exception Procedures or Unsuccessful Outcome .2 1.3 Alternative Procedures .3 1.4 Interactions with Other Wireless Services3 TIA-664.531-B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
21、 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Revision History 531-ii Revision History Revision Date Remarks IS-735, Revision 0 January 1998 Initial publication ANSI/TIA/EIA/664-531 July 2000 Initial ANSI publication TIA-664.531-A December 2000 Updated ANSI publication TIA-66
22、4.531-B September 2007 Updated publication TIA-664.531-B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 531-1 Network Directed System Selection (NDSS) 1 Network Directed System
23、 Selection (NDSS) The Network Directed System Selection (NDSS) feature is a network capability that provides a network based mechanism for a service provider, based on various customer and service provider specified criteria, to automatically direct a subscribers Mobile Station (MS) to a desired ser
24、ving system. The serving system could be any system available to the MS, regardless of frequency band (cellular A/B or PCS bands A/B/C/D/E/F) or technology (analog or digital). NDSS consists of procedures that allow wireless subscribers to register upon a preferred system while they are roaming (i.e
25、., outside of their home system) without manual intervention by the subscriber. NDSS allows an MS to automatically register with a preferred serving system or to be automatically directed by their home system to a suggested system based on bilateral agreements between the serving system and home sys
26、tem. When an MS registers on a visited system, the network may direct the MS from that system to another system. The network may provide information which controls the status of the Enhanced Roaming Indicator in the MS. NDSS may override system selection procedures in the MS. The subscriber should h
27、ave the ability, however, to suppress NDSS, and use the MSs system selection procedure. The status of NDSS (i.e., Active, Suppressed) is maintained in the home system, and may be changed upon request by the subscriber. Applicability to Telecommunications Services NDSS is applicable to all telecommun
28、ications services. 1.1 Normal Procedures with Successful Outcome Authorization NDSS may be made generally available for all subscribers by the service provider. Deauthorization NDSS may be withdrawn by the service provider. Registration NDSS has no registration. Deregistration NDSS has no deregistra
29、tion. Activation NDSS is activated upon authorization. TIA-664.531-B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Network Directed System Selection (NDSS) 531-2 Deactivation
30、NDSS is deactivated upon deauthorization. Invocation NDSS is invoked by the home system upon receipt of a registration message. Normal Operation with Successful Outcome This section describes a typical sequence of procedures for a subscriber, whose home and serving systems offer NDSS, which results
31、in a successful outcome. a. The MS may scan a list of preferred systems. If no preferred systems are found, the MS registers with any available system, provided the system is not on the MSs negative system list. A negative system list is defined as a short list of unacceptable system identifications
32、 that is stored in the memory of an MS. These procedures are valid for all forms of registration (implicit, as well as explicit). b. The serving system requests authorization from the subscribers home system. c. The home system determines whether another system is preferable to the current serving s
33、ystem. d. If the home system determines that another system is preferable, and the subscriber has not suppressed NDSS, it may return information to the serving system requesting it to redirect the MS to a different system. If the redirection attempt is unsuccessful, the current serving system, while
34、 not preferred, is always assumed to be acceptable. e. If redirection has been requested by the home system, the serving system shall redirect the MS to the preferred system. f. The MS receives the redirection message and attempts registration with the new system. 1.2 Exception Procedures or Unsucce
35、ssful Outcome This section lists some of the more probable abnormal situations not described in Normal Procedures with Successful Outcome. Registration None identified. Deregistration None identified. TIA-664.531-B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 3
36、2 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 531-3 Network Directed System Selection (NDSS) Activation NDSS is considered activated when suppression of NDSS is turned off in the home system. NDSS may be activated by an authorized subscriber specifying the NDS
37、S activation feature code as in: *FC + SEND Deactivation NDSS is considered deactivated when the suppression of NDSS is turned on in the home system. The MS then reverts to its internal system selection procedure which was used upon initial system access. NDSS may be deactivated by an authorized sub
38、scriber specifying the NDSS deactivation suppression feature code as in: *FC + SEND Invocation If, for some reason, the MS cannot complete service redirection (e.g., registration rejection, invalid system identification, no system found, etc.), it registers with the original visited system and indic
39、ates the failure condition. Exceptions While Roaming None identified. Exceptions During Intersystem Handoff None identified. 1.3 Alternative Procedures None identified. 1.4 Interactions with Other Wireless Services Asynchronous Data Service (ADS) None identified. Call Delivery (CD) None identified.
40、TIA-664.531-B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Network Directed System Selection (NDSS) 531-4 Call ForwardingBusy (CFB) None identified. Call ForwardingDefault (C
41、FD) None identified. Call ForwardingNo Answer (CFNA) None identified. Call ForwardingUnconditional (CFU) None identified. Call Transfer (CT) None identified. Call Waiting (CW) None identified. Calling Name Presentation (CNAP) None identified. Calling Name Restriction (CNAR) None identified. Calling
42、Number Identification Presentation (CNIP) None identified. Calling Number Identification Restriction (CNIR) None identified. Conference Calling (CC) None identified. Data Privacy (DP) None identified. TIA-664.531-B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 3
43、2 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 531-5 Network Directed System Selection (NDSS) Do Not Disturb (DND) None identified. Emergency Services (9-1-1) Emergency calls are not subject to NDSS. Flexible Alerting (FA) None identified. Group 3 Facsimile (G3
44、 Fax) None identified. Message Waiting Notification (MWN) None identified. Mobile Access Hunting (MAH) None identified. Network Directed System Selection (NDSS) Not applicable. Non-Public Service Mode (NP) This interaction is beyond the scope of this Standard. Over-the-Air Service Provisioning (OTAS
45、P) OTASP calls are not subject to NDSS. Password Call Acceptance (PCA) None identified. Preferred Language (PL) None identified. Priority Access and Channel Assignment (PACA) None identified. TIA-664.531-B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 3
46、5 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Network Directed System Selection (NDSS) 531-6 Remote Feature Control (RFC) None identified. Selective Call Acceptance (SCA) None identified. Service Negotiation (SN) None identified. Subscriber PIN Access (SPINA) None identified. Subscriber PIN Intercept (SPINI) None identified. Three-Way Calling (3WC) None identified. User Group (UG) None identified. Voice Message Retrieval (VMR) None identified. Voice Privacy (VP) None identified.
