1、 ATIS-1000016 SERVICE CONTINUITY BETWEEN ACCESS NETWORKS USE CASES AND SERVICE REQUIREMENTS TECHNICAL REPORT The Alliance for Telecommunication Industry Solutions (ATIS) is a technical planning and standards development organization that is committed to rapidly developing and promoting technical and
2、 operations standards for the communications and related information technologies industry worldwide using a pragmatic, flexible and open approach. Over 1,100 participants from over 300 communications companies are active in ATIS 22 industry committees and its Incubator Solutions Program. Notice of
3、Disclaimer she then ends the call. 9 ENTERPRISE INTERWORKING - IP CENTREX NOTE - All of the entities in this document are completely fictional, and any resemblance to any existing entities is completely coincidental. Luke, as an employee of Acme, Inc. (AI) has an office in the corporations downtown
4、complex. AI provides its employees with advanced IP-based Centrex services from BTL. Due to his profession, Luke has a need for anywhere, anytime communication capability. AI has provided Luke with a dual mode handset, which he uses for all his communication needs. Using AIs Centrex features, Luke s
5、peed dials a colleague to obtain the answer to a question. The colleague is out of the office, but his secretary promises he will call back as soon as he returns. o Lukes dual mode handset established a WLAN VoIP connection over AIs enterprise intranet. Luke goes to a nearby coffee shop. The coffee
6、shop provides a BTL WLAN hotspot. As Luke walks into the coffee shop, it occurs to him he is late for a conference call. Using AIs Centrex features he bridges onto the call. As he is participating on the call, Luke leaves the coffee shop. o Lukes dual mode handset established a WLAN VoIP connection
7、over the public hotspot WLAN at the coffee shop, and Luke was able to use AIs Centrex features. Luke continues to participate in the conference call. He walks to his apartment. While walking along, he continues to participate in the conference call. o Lukes call is seamlessly handed over from the WL
8、AN access network to the Cellular access network. Luke enters his apartment, continuing to participate in the call. o Lukes call is seamlessly handed over from the Cellular access network to the home WLAN access network, even though the enterprise WLAN and the home WLAN have different encryption key
9、s. ATIS-1000016 17 The conference call ends, and Luke terminates the call. As hes doing so, he notices the Call Waiting Indicator on his handset is alerting him of a missed call. He checks and discovers that a colleague has called back and left a message. o Lukes Centrex features, including call wai
10、ting indication, work over his home office WLAN. Using AIs Centrex features, Luke speed dials his colleague, and completes a call to the colleague. o Lukes call origination Centrex features work over his home office WLAN. 10 MULTIPLE IDENTITIES / SERVICE PROFILES 10.1 Service Profile Handling 10.1.1
11、 Wireline Based Service Profile Joyce has wireline communications service from BTL, and wireless communications service from Cellular, Inc. She is in the mall, and sees a BTL kiosk where a new dual mode wireless/wireline combined service offering is being promoted. After discussing various aspects o
12、f the service (e.g., coverage, costs, handset issues), she subscribes to the service. o Her service profile is based on her current wireline service profile with BT. o She gets a new dual mode handset with Cellular and WLAN connection capability. o She gets a new ISIM for her handset. NOTE - Assumin
13、g the appropriate business and technical arrangements exist between BTL and Cellular, Inc., her wireless/wireline combined service profile could be based on either of her existing service profiles. 10.1.2 Wireless Based Service Profile Joyce has wireline communications service from BTL, and wireless
14、 communications service from Cellular, Inc. She is in the mall, and sees a Cellular, Inc. kiosk where a new dual mode wireless/wireline combined service offering is being promoted. After discussing various aspects of the service (e.g., coverage, costs, handset issues), she signs up for the service o
15、 Her service profile is based on her current wireless service profile with Cellular, Inc. o She gets a new dual mode handset with Cellular and WLAN connection capability. o She gets a new ISIM for her handset. NOTE - Assuming the appropriate business and technical arrangements exist between BTL and
16、Cellular, Inc., her wireless/wireline combined service profile could be based on either of her existing service profiles. ATIS-1000016 18 10.1.3 Legacy Wireless & Wireline Personal Numbers Joyce is a socially active citizen with a large pool of friends and acquaintances with whom she frequently comm
17、unicates. She has a well-established wireline phone number (assigned by BTL) that many of her friends have used to stay in touch with her. Additionally, she also has a cellular phone service from Cellular, Inc., and a large number of friends only know how to reach her by calling her cell phone numbe
18、r. Its important to Joyce that friends are able to reach her by calling either of the contact numbers by which she is already known. Joyce has noticed that, through some sort of business relationship, Cellular, Inc. and BTL are now offering a dual mode service where she can get a handset that will w
19、ork both on her WLAN at home, and through the cellular telephony access network while she is outside shopping or driving. When Joyce got the service, she was able to keep both of her old phone numbers. Joyce is shopping in a local store. Her dual mode handset rings. Its a friend, Lee, who needs to a
20、sk Joyce a question. o Lee dialed her handset and was able to reach her in the supermarket (over the cellular network). After Joyce ends her call with Lee, the handset rings again. Its Joyces sister, who needs to speak with Joyce. o Joyces sister dialed Joyces wireline number, but reached Joyce on h
21、er dual mode handset over the cellular telephony access network. After Joyce arrives home, her dual mode handset rings again. Its Lee again, with another question. o As before, Lee dialed Joyces cell phone number, but this time the call was routed over Joyces home WLAN. Soon the handset rings again.
22、 This time its Joyces sister again, who needs to give Joyce some important information. o Her sister dialed Joyces legacy wireline number and this time reached Joyce on her dual mode handset over the WLAN in her home. Joyces Experience: She can be reached at either of two phone numbers, over differe
23、nt access networks. 10.2 Two Numbers, Two Service Profiles User scenarios involving two service profiles are outside the scope of the initial version of this document, and are for further study. 11 VOICE EMERGENCY CALL 11.1 Kathy Kathy enjoys the extended communication capability provided by her Voi
24、ce Call Continuity service which is marketed by BTL as a dual mode service that enables continuous seamless voice continuity ATIS-1000016 19 across their WLAN and Cellular access networks. She appreciates having wireless voice call continuity throughout her house, from the home theater in the baseme
25、nt, to the kitchen, and the living room upstairs. She expects emergency calls to work under similar conditions as voice calls, although she realizes that there are no guarantees that calls will always work. One day, her friend comes to visit. During the visit, they both go down to the basement. Sudd
26、enly, Kathys friend faints. Kathy has her dual mode handset with her, and immediately dials 911. Kathy gets connected with a Public Safety Answering Point (PSAP). The PSAP responder asks Kathy to go find some smelling salts (ammonia). While talking to the PSAP responder, she runs upstairs, gets the
27、smelling salts, and returns to the basement. The responder instructs Kathy on how to use smelling salts. Kathys friend responds and is revived. Kathy thanks the responder, and ends the call. 11.1.1 PSAP Call Control One day, her friend comes to visit. During the visit, they both go down to the basem
28、ent. Suddenly, Kathys friend faints. Kathy has her dual mode handset with her, and immediately dials 911. Kathy gets connected with a PSAP. The PSAP responder asks Kathy to go find some smelling salts. While about to go upstairs to pickup smelling salts, Kathy accidentally hangs up, but runs upstair
29、s with the phone anyway. Once upstairs, Kathy goes off-hook and asks the responder how to use the smelling salts. She thanks the responder and ends the call. 11.1.2 PSAP Ring Back Capability One day, her friend comes to visit. During the visit, they both go down to the basement. Suddenly, Kathys fri
30、end faints. Kathy has her dual mode handset with her, and immediately dials 911. Kathy gets connected with a PSAP. The PSAP responder asks Kathy to go find some smelling salts. While about to go upstairs to pickup smelling salts, she accidentally hangs up. But, she runs upstairs with the phone any w
31、ay. The PSAP responder hears Kathy hang-up and calls her back (via ring back capability), and is connected to Kathy via the Cellular network The PSAP responder tells Kathy how to use the smelling salts and disconnects the call. 11.1.3 Emergency Call Handover One day, her friend comes to visit. Durin
32、g the visit, they both go down to the basement. ATIS-1000016 20 Suddenly, Kathys friend faints. Kathy has her dual mode handset with her, and immediately dials 911. Kathy gets connected with a PSAP. The PSAP responder asks Kathy to go find some smelling salts. At this time, there is a power failure,
33、 and Kathy runs upstairs to continue her conversation with the PSAP responder. Kathys Experience: Voice call continuity is provided for emergency calls, employing the PSAP capabilities in a similar manner as that for normal voice calls. 12 VOICE SUPPLEMENTARY SERVICES From the users perspective, voi
34、ce call supplementary service continuity between access networks should be consistently provided in the same manner as for voice calls. Supplementary services should work across access networks in the same manner as voice calls. This section provides use cases illustrating supplementary service cont
35、inuity for WLAN to Cellular access network cases. The same functionality is applicable in the Cellular to WLAN access direction, though such cases are not additionally articulated. 12.1 Call on Hold Kathy is in the local coffee shop. o She has Cellular and WLAN coverage. o An indicator on her handse
36、t indicates she has coverage for Cellular and WLAN. Her handset rings, she looks at the display, sees its from her daughter, and answers the call. Her daughter is concerned about a rash that has mysteriously appeared on her foot, and she would like Joyce to come over and look at it. o She receives t
37、he call over the public WLAN access point in the coffee shop As Kathy is talking to her daughter, she gets another incoming call from her doctor. She hastily apologizes to her daughter, puts her on hold, and picks up the new incoming call. The doctor wants to discuss recent test results. o She has a
38、n active call and a call on hold. The background noise in the coffee shop is making it hard for her to hear what the doctor is saying. So she steps out of the coffee shop and walks across the street to the park where it is quieter, talking to the doctor the entire time. o As she leaves the coffee sh
39、op, she leaves the coverage area of the WLAN. o The indicator on her handset shows she has only Cellular coverage. o Her active voice call is handed over from the WLAN access to Cellular access. o She does not experience a service interruption . ATIS-1000016 21 She finishes her conversation with the
40、 doctor, ends the call, and picks up her call on hold. o The call on hold was also handed over from the WLAN access to Cellular access. She agrees to go see her daughter, and concludes the call. 12.2 Call Waiting Kathy is in the local coffee shop. o She has Cellular and WLAN coverage. o An indicator
41、 on her handset indicates she has coverage for Cellular and WLAN. She is expecting an important call from her doctor. Her handset rings, she looks at the display, sees its from her daughter (caller ID), and answers the call. Her daughter wants to ask Kathy a question. o She receives the call over th
42、e public WLAN access point in the coffee shop. As she is talking to her daughter, she gets another incoming call, and hears a Call Waiting tone. She looks at the display, and sees the call is from her doctor. She leaves the coffee shop to a quieter environment. o As she leaves the coffee shop, she l
43、eaves the coverage area of the WLAN. o The indicator on her handset shows she has only Cellular coverage. o Her active voice call is handed over from the WLAN access to Cellular access. o She does not experience a service interruption. She tells her daughter shell call back as soon as possible, and
44、picks up the waiting call. o The waiting call was also handed over from the WLAN access to Cellular access. She speaks with the doctor, and then afterwards calls her daughter back. 12.3 Call Forwarding Kathy is about to leave to visit her friend. There is no cellular radio coverage where her friend
45、lives, and her friend also doesnt have broadband internet access, only wireline telephone service. Kathy doesnt want to miss her calls while she is at her friends. She is currently in the basement of her home, and activates call forwarding (all calls) to her friends phone number. o An indicator on h
46、er handset shows she has only WLAN coverage. o Call forwarding is successfully activated. While visiting her friend, her friends handset rings. Its Kathys friend, who needs to ask her a question. o Kathys calls are forwarded to her friends house. NOTE - Kathy could have activated call forwarding, an
47、d any of the variants of call forwarding while attached to either the Cellular or WLAN access networks. ATIS-1000016 22 12.4 Three Way Call Kathy is in the local coffee shop. o She has Cellular and WLAN coverage. o An indicator on her handset indicates she has coverage for Cellular and WLAN. Her han
48、dset rings, she looks at the display, sees its from her daughter (caller ID), and answers the call. Her daughter has an urgent medical question. o Kathy receives the call over the public WLAN access point in the coffee shop. Kathy remembers that her mother (Joyce) might know the answer to the questi
49、on. She suggests they make a three way call to talk about it. She activates three way calling and establishes a call with both her daughter and mother at the same time. However, the noise in the coffee shop is making it difficult to hear, so she goes outside and crosses the street into the quieter environment. o As she leaves the coffee shop she leaves the coverage area of the WLAN. o The indicator o
