EP1470729A2 - Procede, systeme et appareil de fourniture de services de reseau longue portee sans fil a une station mobile servie par un reseau local sans fil - Google Patents

Procede, systeme et appareil de fourniture de services de reseau longue portee sans fil a une station mobile servie par un reseau local sans fil

Info

Publication number
EP1470729A2
EP1470729A2 EP20030710630 EP03710630A EP1470729A2 EP 1470729 A2 EP1470729 A2 EP 1470729A2 EP 20030710630 EP20030710630 EP 20030710630 EP 03710630 A EP03710630 A EP 03710630A EP 1470729 A2 EP1470729 A2 EP 1470729A2
Authority
EP
European Patent Office
Prior art keywords
mobile station
wlan
msc
wwan
air interface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20030710630
Other languages
German (de)
English (en)
Inventor
Rangamani Sundar
Murali Aravamudan
Shamim A. Naqvi
Prakash R. Iyver
Kumar K. Vishwanathan
Gurudutt Upendra Pai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Winphoria Networks Inc
Original Assignee
Winphoria Networks Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US10/052,080 external-priority patent/US20030134650A1/en
Priority claimed from US10/052,119 external-priority patent/US20030133421A1/en
Priority claimed from US10/052,081 external-priority patent/US7200112B2/en
Priority claimed from US10/052,127 external-priority patent/US7149521B2/en
Application filed by Winphoria Networks Inc filed Critical Winphoria Networks Inc
Publication of EP1470729A2 publication Critical patent/EP1470729A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1073—Registration or de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • This invention relates to internetworking between wireless local area networks (WLANs) and wide area mobile wireless networks.
  • WLANs wireless local area networks
  • This invention relates to internetworking between wireless local area networks (WLANs) and wide area mobile wireless networks.
  • the situation at the present is that people employ two distinct telephony systems, one in the wireless wide area network, and another in the enterprise premises that is a wireline telephony system, leading to a plurality of handsets, voice mailboxes and addressing mechanisms.
  • wireless local area networks are becoming increasingly popular for wireless data applications.
  • reasonable bandwidth is available to enteiprise-wide wireless clients, e.g., in 802.11b WLAN networks up to 11Mbps are available to a wireless client. This bandwidth is more than sufficient to carry voice as well.
  • widespread use of WLAN technology is driving down the price of the technology.
  • FIG. 1 shows an exemplary wireless wide area network (WWAN) 100 (also known as a wide area mobile wireless network).
  • WWAN 100 includes a plurality of remote units (handsets) 102 in radio contact with one or more antennae based systems called Base Transceiver System (BTS) 104 that transceive the radio signals to/from the handsets.
  • BTS Base Transceiver System
  • a plurality of BTS communicate with a controller called the Base Station Controller (BSC) 106 via fixed links 108 using a variety of protocols and techniques, such as TDM, IP etc.
  • BSC Base Station Controller
  • a plurality of BSC communicate with a switch called the mobile switching center (MSC) 110 that provides connectivity to a wide area switched telephone network (WSTN) 111.
  • MSC mobile switching center
  • the WSTN includes signaling links 113, such as SS7 links, and the public switched telephone network (PSTN) 112.
  • PSTN public switched telephone network
  • an MSC may include a control plane 117 for handling messages on the signaling links, which may be communicated according to a variety of protocols, such as IOS, GSM A interface, IS 41, GSM MAP, etc.
  • the MSC 115 may also include a media gateway 119 that cooperates with the control plane for handling the bearer circuits of the PSTN 112.
  • Some modern MSCs, such as MSC 115 may also communicate on IP networks, such as IP network 120.
  • An MSC with its associated BSC and BTS collectively define a coverage area in which handsets are allowed to receive or transmit telephone calls.
  • Incoming calls to a mobile handset arrive from the PSTN to a gateway MSC, e.g., 115, that then routes the call to the MSC 110, called a serving MSC, within whose coverage area the receiving handset is currently roaming.
  • Outgoing calls from a handset are routed to the serving MSC 109 of the originating handset from where the call is either routed to the serving MSC of the receiving mobile handset via the gateway MSC or to the WSTN via the gateway MSC from where the WSTN routes the call to a (wireline) handset.
  • the gateway and serving MSC functions may be implemented by the same physical entities. Subscribers are allowed to roam in the coverage area and while roaming the various entities of the WWAN cooperate to ensure that the wireless connectivity of the handset is preserved under roaming.
  • a handset may roam from the coverage area of one set of BTS/BSC/MSC to the coverage area of another set of BTS/BSC/MSC.
  • the former set of BTS/BSC/MSC is called the source and the latter set is called the target entities.
  • a set of procedures has been defined that mediate the handoff of the handset from the source to the target entities of the WWAN.
  • an update of the location of the handset may occur. This is accomplished by the handset sending a location update message to an MSC that routes the message to a registry called the Home Location Register (HLR) 114 using standard industry protocols such as IS-41, GSM-MAP, etc.
  • HLR Home Location Register
  • CDMA code division multiple access
  • GSM global system for mobile communications
  • PDC Personal Digital cellular
  • CDMA2000 Universal mobile terrestrial system
  • UMTS universal mobile terrestrial system
  • IMT-2000 international mobile telephone
  • FIG. 2 illustrates an exemplary wireless local area network (WLAN) 200.
  • WLAN includes one or more geographical areas (cells) called basic service set (BSS) 202.
  • a cell is controlled by a system called an access point (AP) 204.
  • BSS basic service set
  • AP access point
  • a WLAN includes several BSS, each with its associated AP.
  • the AP are interconnected usually with a wireline network 206 typically using Ethernet in 802.x WLAN technologies.
  • the AP communicate with an enterprise router 208 that typically routes traffic within and out of an enterprise network.
  • Wireless data clients 210 are allowed to roam within a defined BSS and across the defined BSS, with handoff of the client from one AP to the adjoining AP in accordance to known procedures.
  • the physical layer uses variety of technologies, e.g., in 802.11 WLAN implementations the physical layer may use infrared, frequency hopping spread spectrum in the 2.4GHz Band, or direct sequence spread spectrum in the 2.4GHz Band.
  • the medium access layer (MAC) in addition to carrying out typical functions performs additional functions such as packet fragmentation, re-transmission and acknowledgements .
  • the MAC layer supports two basic access mechanisms: the distributed coordination function (DCF) and the point coordination function (PCF).
  • DCF the basic access mechanism is a carrier sense multiple access with collision avoidance (CSMA/CA) mechanism.
  • CSMA/CA carrier sense multiple access with collision avoidance
  • a typical example is Ethernet that is a CSMA with collision detection (CD) mechanism.
  • CSMA protocols a client wishing to transmit senses the medium, and if the medium is found to be busy, i.e., is being used by some other client, defers the transmission; otherwise it is allowed to transmit. There is always a possibility that two clients will sense the medium to be free and start transmissions thus resulting in collisions; therefore, collision avoidance and detection is very important in such protocols.
  • the 802.11 WLAN uses collision avoidance and detection mechanisms.
  • An 802.11 client wishing to transmit senses the medium and if found busy defers the transmission; otherwise, it transmits.
  • the receiver checks the receipt of a proper transmission (via the cyclical redundancy check -CRC) and if found satisfactory, sends back an acknowledgement. Receipt of the acknowledgement will indicate to the transmitter that the transmission was received properly. If no acknowledgement is received, the transmitter will re-transmit until an acknowledgement is received or the transmitter decides to abort the transmission.
  • certain implementations also use the virtual carrier sense mechanism.
  • a client wishing to transmit first signals its intent by sending a request to send (RTS) to the intended receiver.
  • the receiver responds with a clear to send (CTS) that effectively "reserves" the medium for the transmitter and receiver.
  • the transmitter may now transmit the intended information.
  • a client When a client wishes to access a BSS (either after a power up or when first entering the BSS) it needs to get synchronization information from the AP controlling the BSS.
  • Two methods have been defined for clients to get this information.
  • the client In the passive scanning method the client waits to receive a "beacon frame" from the AP that is transmitted by the AP at regular intervals. The beacon frame contains the synchronization information.
  • the client sends a probe to the AP and awaits a response to the probe. Once the station finds an AP, it needs to be authenticated. This requires exchange of information between the AP and the client to establish the authenticity of the client.
  • the client starts the association process that involves exchange of information between the client and the APs about the location of the client and the capabilities of the BSS. At the completion of the association process, the client is ready for receiving or transmitting data.
  • the AP gains control of the medium upon sensing it to be free for a given length of time called the point inter frame space (PIFS).
  • PIFS point inter frame space
  • the AP then assumes the role of the coordinator and starts to poll all stations enumerated on a "poll list" maintained by the AP. When polled, a station is allowed to transmit.
  • the period in which the AP supports PCF mode is contention-free so may provide better opportunities for voice traffic.
  • the AP must alternate the DCF and PCF periods. All this is well known to practitioners with ordinary skill in the art.
  • WLAN Wireless Wide Area Networks
  • the invention provides a method, system, and apparatus for a Mobile Station to Sense and Select a Wireless Local Area Network (WLAN) or a Wide Area Mobile Wireless Network (WWAN).
  • WLAN Wireless Local Area Network
  • WWAN Wide Area Mobile Wireless Network
  • this facilitates the internetworking of WLANs and WWANs and facilitates the use of multimode mobile stations that can selectively communicate with either a WLAN or a WWAN.
  • a mobile station may communicate according to an 802.xx wireless local area network air interface protocol via WLAN logic or according to a wireless wide area network air interface protocol via WWAN logic.
  • the mobile station detects RF energy in the 802.xx spectrum and, in response to the energy detection, determines whether there is an 802.xx WLAN capable of servicing the mobile station by performing a scanning operation. If there is an 802.xx WLAN capable of servicing the mobile station, the mobile station selects the WLAN logic so that it may communicate via an air interface.
  • the WWAN has information identifying the areas in which capable WLANs operate and the WWAN provisions the mobile station with at least a subset of such information.
  • the mobile station uses such area-identifying information to determine whether to perform the RF energy detection operation.
  • the area-identifying information is cell ids and the mobile station compares the cell id information in which it is operating with the provisioned cell ids.
  • the area-identifying information is geographical positioning satellite (GPS) information and the mobile station determines its GPS coordinates and compares it against the provisioned GPS information.
  • GPS geographical positioning satellite
  • the mobile station compares the RF energy value with a threshold value and the mobile station detects the RF energy of the WWAN and compares said RF energy of the WWAN with a predetermined value.
  • the comparisons of the RF energy values with corresponding thresholds are used by the mobile station to select whether to communicate with the 802.xx WLAN and the WWAN.
  • the area-identifying information includes information identifying WLANs other than that used by a service plan of the mobile station.
  • the information identifying WLANs includes information identifying WLANs of enterprises accepting service of the mobile station.
  • the mobile station is provisioned with the area information via SMS messages from the WWAN.
  • the invention provides a method, system and apparatus for providing mobility management of a mobile station in WLAN and WWAN environments.
  • a mobile switching center is provisioned to act as a serving MSC for a WLAN.
  • a mobile station detects the RF energy of the WLAN and validates its ability to be a member of the WLAN.
  • the mobile station issues a registration request to the serving MSC for the WLAN, and in response, the serving MSC for the WLAN causes a WWAN to recognize that the mobile station is registered with the serving MSC for the WLAN and that the mobile station is no longer served by a prior MSC.
  • the mobile station communicates to entities outside of the WLAN by communicating with the WLAN via a WLAN protocol and the WLAN communicates with the WWAN via the serving MSC for the WLAN.
  • the mobile station issues a registration request by sending a SIP Register message on the WLAN via a WLAN air interface protocol to request registration therein, and the WLAN communicates the registration request to the MSC serving the WLAN.
  • a mobile station detects the RF energy of the WLAN and validates its ability to be a member of the WLAN while the mobile station is participating in a call using a WWAN air interface protocol.
  • a message is sent to a source MSC that is servicing the call, indicating that a handoff is desired.
  • the source MSC analyzes the message, establishes itself as an anchor MSC, and establishes communication channels with a target MSC servicing the detected WLAN.
  • the mobile station begins communication with the WLAN via a WLAN air interface.
  • the WLAN forwards messages to the target MSC serving the WLAN via IP communication, and the target MSC relays those communication to the anchor MSC.
  • a mobile station determines that it should communicate via a WWAN air interface protocol and not via a WLAN air interface protocol.
  • the mobile station issues a registration request to the WWAN via a base station controller (BSC) and MSC corresponding to a location in which the mobile station resides.
  • BSC base station controller
  • MSC mobile station controller
  • the corresponding MSC causes the WWAN to recognize that the mobile station is registered with the corresponding MSC and that the mobile station is no longer served by a prior MSC which served the mobile station when it was communicating according to a WLAN air interface protocol.
  • a mobile station determines that it should communicate according to a WWAN air interface protocol while the mobile station is participating in a call under a WLAN air interface protocol.
  • a message is sent to a source MSC that is servicing the call indicating that a handoff is desired.
  • the source MSC analyzes the message, establishes itself as an anchor MSC, and establishes communication channels with a target MSC servicing a geographic WWAN area in which the mobile station resides.
  • the mobile station begins communication with the WWAN and the target MSC relays those communication to the anchor MSC.
  • the mobile station informs the MSC serving the WLAN of the cell ids of the WWAN geographic area, and the source MSC uses the cell ids information to establish communication channels with the target MSC.
  • a mobile station determines that it should communicate according to a WWAN air interface protocol while the mobile station is participating in a call under a WLAN air interface protocol.
  • a message is sent to a source MSC to request a temporary local directory number (TLDN) .
  • the source MSC provides a TLDN to the mobile station.
  • the source MSC causes a called party of the call to be placed on hold and the mobile station requests a call to be made using the TLDN as a called party.
  • the WWAN causes call connections to be made connecting the mobile station with the TLDN to resume the call.
  • the invention provides a method, system and apparatus for providing WWAN services to a mobile station serviced by a WLAN.
  • an MSC is provisioned to serve a WLAN.
  • the MSC that serves the WLAN receives WWAN messages that provide a WWAN service.
  • the MSC forms SIP messages using the received WWAN messages and delivers the SIP messages to the WLAN via an IP link.
  • the WLAN delivers the SIP messages to the mobile station via a WLAN air interface protocol.
  • the WWAN service is a Short Message Service (SMS) and the WWAN includes a SMS Center for delivering SMS messages on the WWAN.
  • SMS Short Message Service
  • the MSC forms SIP Invite messages with SMS payload and delivers said SIP Invite messages to the WLAN.
  • the WWAN service is a Message Wait Notification (MWN) and the WWAN provides MWN messages to the WWAN.
  • MWN Message Wait Notification
  • the MSC forms SIP Invite messages with MWN information and delivers said SIP Invite messages to the WLAN.
  • the MSC that services the WLAN and an MSC servicing the WWAN cooperate to provide TFO call services between an mobile station operating in the WLAN and a mobile station operating in the WWAN.
  • the invention provides a method, system and apparatus for internetworking a mobile station to operate in a WWAN environment and in a WLAN environment with PBX services.
  • a switch is provisioned to communicate with a WLAN via IP communication and to communicate with a PBX via a PBX interface.
  • the switch receives mobile station communications via the WLAN.
  • the switch converts the mobile station communications to a format compatible with the PBX interface and forwards the converted communications to the PBX.
  • the PBX receives and handles the converted communications.
  • the switch is further provisioned to communicate with a WWAN and the switch analyzes the mobile station communications and determines that the communications address an entity external to a domain of the PBX.
  • the switch requests a TLDN from a MSC serving the WWAN.
  • the switch sends a message to the PBX to connect the mobile station call to the specified TLDN.
  • the PBX connects the mobile station call to the specified TLDN.
  • a mobile station may roam during the call and switch to an WWAN air interface protocol.
  • the mobile station reconnects to the call by specifying the TLDN of the call.
  • the reconnection happens automatically without user intervention.
  • FIG 1 shows a prior art wireless wide area network (WWAN);
  • FIG. 2 shows a prior art wireless local area network (WLAN);
  • Figure 3 shows an internetworked wireless network according to certain embodiments of the invention
  • Figure 4 shows a multimode mobile station detecting the presence of a WLAN according to certain embodiments of the invention
  • Figure 5 shows a multimode mobile station receiving cell id information from the macro network identifying relevant areas in which the mobile station may sense for a WLAN according to certain embodiments of the invention
  • Figure 6 shows a multimode mobile station receiving cell id information from the macro network identifying public and other enterprise WLANs according to certain embodiments of the invention
  • Figure 7 shows a multimode mobile station according to certain embodiments of the invention.
  • Figure 8 shows an internetworked wireless network according to certain embodiments of the invention in which a mobile station may roam from a WLAN environment and/or in which a handoff of servicing a mobile station from a WLAN to a WWAN occurs;
  • Figure 9 shows mobility management logic according to certain embodiments of the invention.
  • Figures 10-11 show specific mobility management logic according to certain embodiments of the invention
  • Figure 12 shows mobility management logic according to certain embodiments of the invention
  • FIGS 13-14 show specific mobility management logic according to certain embodiments of the invention.
  • Figure 15 shows an internetworked wireless network according to certain embodiments of the invention in which a mobile station may roam from a WWAN environment and/or in which a handoff of servicing a mobile station from a WWAN to a WLAN occurs;
  • Figure 16 shows mobility management logic according to certain embodiments of the invention.
  • FIGS 17-18 show specific mobility management logic according to certain embodiments of the invention.
  • Figure 19 shows mobility management logic according to certain embodiments of the invention.
  • FIGS 20-21 show specific mobility management logic according to certain embodiments of the invention.
  • Figure 22 shows logic for providing SMS to a mobile station operating in a
  • WLAN environment according to certain embodiments of the invention.
  • Figure 23 shows logic for providing MWN service to a mobile station operating in a WLAN environment according to certain embodiments of the invention
  • FIGS. 24-25 show logic for handling intra enterprise calls according to certain embodiments of the invention.
  • FIGS. 26-27 show logic for handling an enterprise to PSTN call according to certain embodiments of the invention.
  • Figure 28 shows logic for handling an enterprise to macro network call according to certain embodiments of the invention
  • Figure 29 shows an internetworked wireless network according to certain embodiments of the invention
  • Figure 30 shows mobility management logic according to certain embodiments of the invention.
  • Figure 31 shows an internetworked wireless network according to certain embodiments of the invention in which PBX services are integrated.
  • Preferred embodiments of the invention provide voice internetworking between WLANs and WWANs and effectively unify these two disparate technologies. Consequently, users no longer need to suffer the problems associated with multiple handsets, addresses, and voice mailboxes.
  • a gateway MSC (GMSC) switch of the WWAN with some associated modifications to the WLAN client provides the logic necessary for unification. In essence the GMSC simultaneously acts as a serving MSC for WLAN voice traffic.
  • GMSC gateway MSC
  • FIG 3 illustrates an exemplary embodiment of the present invention.
  • the WWAN components are like those described above in conjunction with figure 1 except that MSC 302 includes some new internetworking logic discussed below to handle the unification of the WLAN and WWAN to make it act as one macro network 300.
  • the MSC 302 acts as a serving MSC for the WLAN.
  • the WLAN and WWAN are now effectively connected by the IP links 304. Voice traffic along with the associated signaling and control messages to and from the WLAN are carried on the set of IP links 304 from the enterprise to the IP interfaces of the MSC 302.
  • the WLAN components are also like those described above, except that the handsets or wireless data clients 310 now include multimode devices capable of operating in the WLAN or WWAN environments, as will be explained below.
  • the MSC 302 allows telephone calls to be completed between clients of the WWAN 100 and WLAN 200.
  • the WLAN clients are free to roam in the WLAN environment and may also roam in the WWAN environment without any manual interventions required of the subscriber.
  • the voice traffic from the WLAN to the MSC 302 may utilize any of the known voice coding technologies.
  • EVRC Enhanced Variable Rate Codec
  • AMR Adaptive Multi-rate
  • the coded voice is then carried as RTP UDP/IP packets on the IP links 304.
  • the control and signaling information is also carried on the IP links 304 from the WLAN 200 to the MSC 302.
  • the control and signaling information is carried in the format of Session Initiation Protocol (SJP) messages with additional information elements (DEs) described as a part of the present invention for control of hand offs of the handsets.
  • SJP Session Initiation Protocol
  • DEs additional information elements
  • Voice internetworking in certain embodiments is facilitated by the use of a multimode handset 310 that may operate in a WLAN or WWAN environment.
  • the WLAN and WWAN (multimode) phone 310 at any time should be able to automatically determine if it is capable of using WLAN access instead of a macro network carrier (GSM, CDMA, UMTS, TDMA, PDC, etc.).
  • GSM Global System for Mobile communications
  • CDMA Code Division Multiple Access
  • UMTS Universal Mobile communications
  • TDMA Time Division Multiple Access
  • PDC etc.
  • the presence of a WLAN can be inferred by detecting RF energy in the permitted 802.1 lb/a spectrum (2.4GHz band for 802.1 lb/802.1 lg and 5 GHz band for 802.11a). As shown in Figure 4, the mobile station 310 may initiate a detection 402 of RF energy in the relevant spectrum. After successful energy detection, the mobile station can detect if a valid WLAN 200 is present by one of the two methods:
  • the station 310 searches for a beacon frame broadcast by the 802.11 AP 204
  • the station 310 transmits probe request frames and waits for probe response frames from the AP 204.
  • the AP sends a SSID (1-32 octets length string) that identifies the AP 204.
  • the mobile station 310 compares this SSID with a list of SSIDs (which may include ranges) and if there is a match, infers that the WLAN 200 is a valid network for it to gain access.
  • the mobile station 310 goes through an authentication process after a successful SSID match. If the authentication succeeds, the mobile station proceeds with the association process whereby the mobile station joins the WLAN network as a valid and legal client (node).
  • the mobile station 310 is a priori provisioned with the valid list of SSIDs and SSID ranges.
  • the SSID comparison avoids the mobile station from entering into authentication or association processes in functioning WLAN networks on which it could never be authenticated. For example, let the mobile station MSI belong to Enterprise El that uses SSID EnlSSIDl. When the mobile station enters the Enterprise El, the beacon search succeeds and further an SSID match occurs and hence the mobile station proceeds with the authentication process. On successful authentication, it proceeds with the association process and gains access to the WLAN service.
  • the provisioning of SSIDs in the mobile station can be initiated from the macro network 300 using over the air provisioning procedures (OTASP/OTAPA) in the case of CDMA networks and equivalent in GSM/UMTS networks (using Short Message Service).
  • OTASP/OTAPA over the air provisioning procedures
  • the message itself could be encrypted using the same key used in the mobile station for macro network authentication/encryption (A-key or SSD).
  • the periodic detection and subsequent discovery of the presence of the WLAN impacts the battery life of the mobile station. It is desirable to minimize the battery consumption and one way to achieve this in the multimode phone is to minimize the number of detection or discovery attempts and at the same time preserving the ability to jump on to the enterprise WLAN if it is available.
  • Two observations on the use of the multimode mobile stations 310 enable the reduction in the number of detection discovery attempts:
  • the number of areas where the enterprise Wireless LAN service is available for the subscriber is limited; for example, enterprise subscribers may be limited to get access to their WLAN services in their enterprise locations only.
  • the multimode mobile station is always attempting to stay connected to the macro network (CDMA, GSM, UMTS, etc.).
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile communications
  • UMTS Universal Mobile Subscriber Identity
  • a CDMA phone on detection of a valid IS-95/IS-2000 signal will attempt registration with the IS-41 core network
  • GSM/UMTS phone on detection of a valid GSM/UMTS signal will attempt registration with the GSM-MAP core network.
  • the cell id that is known to both the macro network and the mobile station, indicates the current location of the mobile station.
  • the macro network 300 can determine when the mobile station 310 should be attempting to detect or discover the enterprise WLAN. As shown in figure 5 in a preferred embodiment of the present invention, the macro network 300 can send 502 information regarding the detection or discovery process to the mobile station 310 on a successful network registration.
  • the information includes the macro network cell-ids where the mobile station 310 should attempt to detect or discover 402' an enterprise WLAN.
  • the cell-id is a gross measure and hence can cover a very large area (in the order of few square miles in rural/suburban areas) or a very small area (in the order of few hundred square meters in dense urban areas).
  • CDMA IS-95
  • bis IS-95 phone initiates a network registration.
  • the macro network 300 determines that the subscriber may possibly enter the coverage area of the WLAN service in Building W; that is, the macro network correlates the information that the subscriber and Building W are in the Tewksbury switching area.
  • the macro network now provides 502 the cell-id information where the W building is located to the subscriber's mobile station 310 and a trigger that WLAN sensing should now begin.
  • the mobile station On receipt of this information, the mobile station starts to scan for the 802.11 beacon, specifically looking for a match with the SSID list of the APs in Building W. This detection will not succeed until the subscriber enters the BSS 202.
  • the mobile station 310 of the subscriber Upon successful detection of the beacon from the AP 204, the mobile station 310 of the subscriber de-registers from the macro network 300 and registers with the serving MSC 302 for the WLAN 200.
  • the mobile station 310 roams in the WLAN 200, it continues to sense the RF energy strength of the WWAN 100 and WLAN 200. If it detects that the WLAN RF strength decreases below some threshold value and the WWAN strength is above a threshold value, it initiates a registration process with the macro (WWAN) network 100.
  • WWAN macro
  • the cell ids of the macro network 300 may designate very large geographical areas. If the cell id relates to a small geographical area then the chances of minimizing power consumption in the mobile station are better since the detection or discovery process is limited to the smaller geographical area. Under some embodiments the availability of GPS (Geographical Positioning Satellite) information integrated into the mobile stations may be used. Since GPS information is more accurate as compared to cell id information, the use of GPS information will further reduce the geographical area in which the detection or discovery process needs to be initiated, thus leading to more savings in the power consumption of the mobile station.
  • GPS Global Positioning Satellite
  • the list of cell-ids provided by the macro network to the mobile station can consist not only of enterprise locations that the subscriber can roam into but potentially other "enterprises” or "public areas" as well.
  • the macro network service provider may have a roaming arrangement with a public enterprise LAN such as a restaurant or a hotel.
  • a subscriber 310 registers with the macro network, it would be beneficial to also receive 602 the cell-ids where the subscriber's enterprise is located but also the cell-ids where the public LANs are located in the same switching area.
  • the delivery of the location information or more direct instruction to start (or stop) searching for WLAN beacon in the mobile station 310 can be accomplished using standard Short Message Service (SMS), or by using logic based in a Service Control Point (SCP), or by modifying the the HLR or using a Proxy HLR entity.
  • SMS Short Message Service
  • SCP Service Control Point
  • Proxy HLR entity e.g., U.S. Pat. Apl. 09/845,703, filed April 30, 2001 for an example of a proxy HLR, which application is hereby incorporated by reference in its entirety.
  • the macro network can deliver the cell-id list, beacon search/stop instruction etc., as a SMS (short message service) with a specific type.
  • the SMS message is sent after a successful response to the Location Update initiated by the mobile station 310.
  • the MSC 302 can have switch based logic that initiates a trigger on location update that causes a switch resident or Service Control Point (SCP) resident application to generate the SMS message with the cell-ids.
  • SCP Service Control Point
  • a switch could be programmed to trigger an SCP on receipt of a location update.
  • the SCP-resident logic may then send the location and sensing instructions to the mobile station.
  • the HLR 114 can be modified to perform the same task on successful processing of an IS- 41 REGNOT request or GSM-MAP UPDATE LOCATION request.
  • a Proxy HLR may be employed.
  • the Proxy HLR intercepts all messages intended for the HLR from the MSC. Registration messages received from the multimode WWAN and WLAN clients are handled by the Proxy HLR whereas messages from all the other clients are forwarded to the HLR without any modifications.
  • FIG. 7 shows a handset 310 according to exemplary embodiments of the present invention.
  • the handsets include logic to communicate according to a WLAN air interface protocol (such as 802.xx) and to communicate according to a WWAN air interface protocol.
  • the mobile station may select to use one of the air interface logic unit based on its sensing of relevant radio spectrum.
  • a handset may support more than one WWAN macro network technology.
  • CDMA handsets it is assumed that a WLAN modem will be added to the handset.
  • the capability to transport voice as SIP/RTP/UDP/IP packets will be needed.
  • the network sensing method discussed in the previous section along with the modifications required to reduce the detection and discovery traffic by utilizing cell-ids, in the preferred embodiment of the present invention, are to be captured by special computer programs running on the computing platform of the handset.
  • Figure 8 shows the movement of a mobile station 310 from a WLAN environment 200 to a WWAN environment 100.
  • the mobile station 310 registers in the WWAN environment 100 as it roams from the WLAN 200 into the WWAN. Likewise the appropriate handoff must be made as well.
  • the mobile station 310 using the network sensing method described above, infers that it needs to register with the WWAN environment.
  • the logic starts at 900 and proceeds to 902 in which the mobile station 310 issues a registration request to the (new) serving base station controller (BSC) 106 in the WWAN.
  • the BSC 106 transmits 904 a Location Update message to its serving MSC 110.
  • the serving MSC 110 in the WWAN requests 906 a registration from the HLR 114.
  • the HLR 114 sends 908 a de-registration request to the (previous) serving MSC 302 in WLAN.
  • the (previous) serving MSC 302 may send 910 a SIP registration cancel request to the mobile station 310 that will respond with a confirmation.
  • the (previous) serving MSC 302 responds 912 to the de- registration message to the HLR 114.
  • the HLR confirms 914 the registration request to the (new) serving MSC 110 in the WWAN.
  • the (new) serving MSC 110 accepts 916 the Location Update from the BSC 106.
  • the BSC 106 acknowledges 918 the registration from the mobile station 310.
  • the WWAN is an IS-41 network
  • the registration, de-registration and confirmatory messages will use IS-41 protocol elements.
  • the various specific messages used, as explained with reference to figure 9, are shown in figure 10.
  • the WWAN is a GSM-MAP network
  • the registration, de-registration and confirmatory messages will use GSM-MAP protocol elements.
  • the various specific messages used as explained with reference to figure 9 are shown in figure 11.
  • Hard Handoff from WLAN to WWAN In this case, the mobile station 310, while engaged in a telephone call, roams from WLAN 200 to WWAN 100.
  • the WLAN environment needs to handoff 802 the mobile station 310 from the WLAN serving MSC 302 to WWAN serving MSC 110.
  • the SIP client Since the mobile station 310 is engaged in a call within WLAN, the SIP client is managing the call in the mobile station 310. This client needs to inform the WLAN serving MSC 302 the cell ids of the WWAN macro network.
  • the SIP command "SIP INFO" is overloaded with this cell id information.
  • the overloaded information elements are so indicated in the logic described below in connection with figure 12.
  • the logic starts at 1200 and proceeds to 1202 in which the mobile station 310 informs the WLAN serving MSC (Source MSC) 302 that a handoff is required.
  • This may be based on the network sensing method.
  • the mobile station 310 senses both the WLAN and the WWAN networks and chooses one of them based on the relative RF strengths.
  • the cell id of the WWAN network becomes known to the mobile station 310.
  • the mobile station 310 uses the cell id to initiate a hard handoff to the WWAN network from the WLAN network.
  • the handoff required message the cell id of the WWAN network is sent to the WLAN switch. This is an overloaded SIP command.
  • the cell id is used so that the MSC that was serving the WLAN and is now the anchor knows which other MSC to connect to.
  • the source MSC 302 issues 1204 a facility directive (FD) to the WWAN MSC (Target MSC) 110 that allows it open a bearer channel on PSTN 112 (for example) from Source MSC 302 to Target MSC 110.
  • FD facility directive
  • the Target MSC 110 sends 1206 a handoff request to the (Target) BSC 106.
  • the Target BSC 106 commences 1208 RF channel signaling with the mobile station 310.
  • the Target BSC 106 sends 1210 handoff request acknowledgement to Target MSC 110.
  • the Target MSC 110 responds 1212 to the facility directive request back to the Source MSC.
  • the Source MSC 302 sends 1214 a message to the mobile station 310 indicating that a handoff may be commenced. For example, this message may be sent as an overloaded SIP message.
  • This message effectively informs the mobile station that it may select and start using the appropriate RF and modulation circuitry to communicate with the WWAN.
  • the mobile station 310 sends 1216 a message to the source MSC 302 to commence handoff. Again, this message may be sent as an overloaded SIP message.
  • the mobile station 310 commences 1218 RF channel signaling with Target BSC 106.
  • the mobile station 310 sends 1220 handoff completion message to Target BSC 106. Again, this message may be sent as an overloaded SIP message.
  • the Target BSC 106 acknowledges 1222 handoff order to the mobile station 310.
  • the Target BSC 106 sends 1224 handoff complete message to Target MSC 110.
  • the Target MSC 110 sends 1226 message to Source MSC 302 indicating that the mobile station 310 is on channel with Target BSC 106.
  • the Source MSC 302 sends 1228 a message to the mobile station 310 indicating that it may clear any resources assigned this transaction.
  • the mobile station 310 responds 1230 with OK acknowledgement.
  • the WWAN is an IS-41 network
  • the messages excluding the overloaded messages, will use IS-41 protocol elements.
  • the various specific messages used as explained with reference to figure 12 are shown in figure 13.
  • the WWAN network is a GSM- MAP network
  • the protocol elements used will be GSM-MAP.
  • the various specific messages used as explained with reference to figure 12 are shown in figure 14.
  • Figure 15 shows the case of the mobile station 310 roaming from a WWAN 100 to WLAN 200 environment.
  • the mobile station 310 using the network sensing method described above, senses the RF strength in the proximity of the WLAN and decides to start using the WLAN environment, thus initiating a registration request.
  • the mobile station may use the cell id information to determine when to start sensing the WLAN.
  • Mobile Station enters WLAN from WWAN: As the mobile station 310 enters a WLAN 200 from a WWAN 100, the logic of figure 16 is followed. The logic starts in 1600 and proceeds to 1602 in which the mobile station 310 issues 1602 a registration request to the WLAN Serving MSC 302 upon sensing the WLAN RF energy strength, as described above. This is done via a SIP message (e.g., a broadcast message), which the WLAN Serving MSC receives.
  • the WLAN Serving MSC 302 sends 1604 a registration request to the HLR 114.
  • the HLR issues 1606 a de-registration request to the (previously) Serving WWAN MSC 110.
  • the HLR Upon confirmation of de-registration, the HLR sends 1608 a registration response confirmation to the WLAN MSC 302.
  • the WLAN MSC 302 confirms 1610 the registration to the mobile station 310.
  • a mobile station 310 roams from IS-41 WWAN to 802.11 WLAN.
  • the various specific messages used as explained with reference to figure 16 are shown in figure 17.
  • the mobile station 310 issues a "SIP Register" message to the WLAN Serving MSC 302 that sends a IS-41 Registration Notification (REGNOT) to the HLR 114.
  • REGNOT IS-41 Registration Notification
  • the HLR sends a Registration Cancellation request to the WWAN MSC 110 that was serving the mobile station 310 (to de-register the mobile station) and upon receiving a confirmation of the de-registration, sends a confirmation of registration to the WLAN Serving MSC 302 which then sends a "SJP 200 OK" (confirmation) message back to the mobile station 310, completing the transaction.
  • the mobile station 310 enters 802.11 WLAN from GSM-MAP WWAN
  • the registration, de-registration and confirmation messages from the HLR will employ the corresponding GSM-MAP protocol elements.
  • the various specific messages used as explained with reference to figure 16 are shown in figure 18.
  • Hard Handoff from WWAN to WLAN In this case the mobile station 310, while engaged in a telephone call, roams from WWAN 100 to WLAN 200.
  • the unified WLAN and WWAN environment needs to handoff 1502 the mobile station 310 from the WWAN Serving MSC 110 to WLAN Serving MSC 302.
  • Certain embodiments of the invention implement such a handoff using the logic of figure 19.
  • the logic begins at 1900 and proceeds to 1902 in which the BSC 106 serving the mobile station 310 (Serving BSC) decides 1902, based upon information received from the mobile station 310 that may be using the Network Sensing Method described above, that a handoff is required. It sends a handoff required message to the Source MSC 110.
  • the BSC 106 serving the mobile station 310 decides 1902, based upon information received from the mobile station 310 that may be using the Network Sensing Method described above, that a handoff is required. It sends a handoff required message to the Source MSC 110.
  • the Source MSC 110 issues 1904 a facility directive to the WLAN MSC (Target MSC) 302 that allows it to open a bearer channel on PSTN 112 from Source MSC 100 to Target MSC 302.
  • the mobile station 310 sends 1906 a handoff request to the Target MSC 302; under certain embodiments of the present invention, this message is sent using SIP with overloaded commands.
  • the Target MSC 302 acknowledges 1908 the request.
  • the mobile station 310 acknowledges 1910 the response of the Target MSC 302.
  • the Target MSC 302 responds 1912 to facility directive request to Source MSC 110.
  • the Source MSC 110 sends 1914 a message to Source BSC 106 that a handoff may be commenced.
  • the Source BSC 106 sends 1916 a handoff directive to mobile station 310.
  • the mobile station 310 sends 1918 a message to acknowledge.
  • the Source BSC 106 sends 1920 a message to Source MSC 110 that handoff has commenced.
  • the mobile station 310 sends 1922 handoff completion message to Target MSC, again via an overloaded SIP message.
  • the target MSC acknowledges 1924 handoff order to mobile station 310.
  • the Target MSC 302 sends 1926 message to Source MSC 110 indicating that the mobile station 310is on channel with target MSC.
  • the Source MSC 110 sends 1928 a message to Source BSC 106 to clear facilities.
  • the Source BSC 106 responds 1930 with OK clear complete.
  • SMS Short Message Service
  • a mobile station 310 while roaming in a WLAN 200 preferably supports SMS service. Under certain embodiments the logic of figure 22 implements the SMS service in WLAN 200.
  • the SMS Messaging Center sends 2202 a SMS request (Short Message Delivery Point to Point -SMDPP) to the WLAN Serving MSC 302.
  • the Serving MSC 302 overloads and sends 2204 the SIP INVITE message with SMS payload to the mobile station 310.
  • the mobile station 310 responds 2206 with an OK acknowledgement.
  • Serving MSC 302 indicates 2208 to the MS that the transaction is complete.
  • the mobile station 310 responds 2210 OK.
  • the Serving MSC 302 responds 2212 with SMDPP Request Response to the SMS Message Center.
  • MWN is a feature of WWAN 100.
  • a mobile station 310 while roaming in WLAN 200 preferably supports MWN service.
  • the logic of figure 23 provides
  • the IS-41 HLR 114 sends 2302 a Qualification Directory Notification (with MWN Type) to the WLAN Serving MSC 302.
  • the Serving MSC 302 overloads 2304 the SIP INVITE message with MWN info to the mobile station 310.
  • the mobile station 310 responds 2306 with an OK acknowledgement.
  • the Serving MSC 302 indicates 2308 to the mobile station 310 that the transaction is complete.
  • the mobile station 310 responds 2310 OK.
  • the Serving MSC 302 responds 2312 with Qualification Directive Notification Response Request to the IS-41 HLR.
  • Intra Enterprise Telephone Call In this case a mobile station 310 (MSI) while roaming in the WLAN 200 initiates an intra enterprise call to another mobile station (MS 2). Under certain embodiments, all interactions with MSI and MS 2 are carried out in SIP. The logic to implement such calls is described in connection with figure 24.
  • MSI initiates 2402 a call request to the WLAN Serving MSC 302.
  • the MSC 302 receives the request and asks 2404 the HLR 114 to locate MS2.
  • HLR 114 responds 2406 with location of MS2.
  • the MSC 302 issues 2408 an invitation to MS2.
  • MS2 acknowledges 2410 request.
  • the MSC 302 acknowledges 2412 the acknowledgement of MS2.
  • the MSC 302 sends 2414 acknowledgement to MSI indicating that the call may now proceed.
  • MSI acks 2416, and the call between MSI and MS2 proceeds.
  • the intra enterprise call proceeds using EVRC (Extended Variable Rate Coding) on RTP/UDP/D? packets.
  • EVRC Extended Variable Rate Coding
  • the requests to locate MS2 in IS-41 networks may use IS-41 protocol elements.
  • Figure 25 shows another exemplary embodiment in which the call proceeds by using GSM EFR (Extended Full Rate Coding) on RTP/UDP/IP packets with HLR inquiries using GSM- MAP protocol elements.
  • a mobile station 310 initiates a telephone call to a PSTN handset.
  • the logic of certain embodiments of the invention to support such a call is described in connection with figure 26.
  • the mobile station 310 using SIP sends 2602 a call request to the Serving WLAN MSC 302.
  • the Serving MSC 302 asks 2604 the HLR 114 to locate the called party.
  • the HLR 114 responds 2606 with the location (PSTN switch) of the called party.
  • the Serving MSC 302 requests 2608 a connection capable of carrying voice traffic from the Media Gateway of the MSC 302.
  • the Media Gateway responds 2610 with a connection response.
  • the Serving MSC 302 sends 2612 a connection request to the PSTN switch associated with the called telephone number (i.e., the switch to which the called party is connected).
  • the PSTN Switch acknowledges 2614 receipt of request.
  • the Serving MSC 302 tells 2616 the mobile station 310 that it is trying the called party.
  • the PSTN Switch responds 2618 with connection information.
  • the Serving MSC 302 sends 2620 a message to mobile station 310 indicating it is OK to proceed with call.
  • the mobile station 310 acknowledges 2622 and conversation
  • the voice traffic may be carried as EVRC on RTP/UDP/IP packets between the mobile station 310 and the Serving MSC 302 and as 64K PCM voice between the Serving MSC 302 and the PSTN switch.
  • the HLR interactions may be carried out using IS-41 protocol elements.
  • Figure 27 shows another exemplary embodiment in which the HLR interactions may be carried out using GSM-MAP protocol elements and the voice between the mobile station 310 and the Serving MSC 302 may be carried as GSM EFR on RTP/UDP/IP packets, and as 64K PCM voice circuits between the Serving MSC and the PSTN switch.
  • TFO Tandem Free Operation
  • the mobile station 310 using STP sends 2802 a call request to the Serving WLAN MSC 302.
  • the Serving MSC 302 asks 2804 the HLR 114 to locate the called party using GSM MAP.
  • the HLR 114 asks 2806 the Serving GSM MSC 110 to locate MS2, i.e., provide roaming number associated with MS2.
  • the GSM MSC 2808 responds with MS2's roaming number to HLR 114.
  • the HLR 114 sends 2810 routing response to WLAN Serving MSC 302.
  • the Serving MSC 302 requests 2812 a connection capable of carrying voice traffic from the Media Gateway with TFO on trunk side.
  • the Media Gateway responds 2814 with a connection response.
  • the Serving MSC 302 sends 2816 a connection request to the GSM MSC.
  • the GSM MSC 110 acknowledges 2818 receipt of request.
  • the Serving WLAN MSC 302 tells 2820 the mobile station 310 that it is trying the called party.
  • the GSM MSC 110 responds 2822 with connection information.
  • the Serving MSC 302 sends 2824 a message to mobile station 310 indicating it is OK to proceed with call.
  • the mobile station 310 acknowledges and conversation may now begin.
  • the voice traffic may be carried as GSM EFR on RTP/UDP/Tp packets between the MS and the Serving MSC and as GSM EFR in 64K DS0 as a TFO channel between the WLAN Serving MSC (Media
  • Gateway Gateway
  • GSM MSC GSM Radio Access Network
  • a basic mechanism of the present invention is the handoff of the mobile station as it roams during a call from a WLAN to the WWAN environment.
  • This mechanism assumes the existence of trunks connecting the WLAN and WWAN switches using a standard mobility management protocol such as IS-41.
  • Figure 29 shows an exemplary embodiment of a method that may be used to affect handoffs in the absence of such connectivity, and exemplary logic is discussed in connection with figure 30.
  • the mobile station 310 while engaged in a telephone call with Party A, who may be using a
  • PSTN handset 2902 or a WWAN mobile handset 2904 senses both the WLAN and
  • mobile station 310 may determine 3002 that handoff is imminent. Upon making this determination mobile station 310 requests 3004 the WLAN switch 302 to issue it a Temporary Local Directory Number (TLDN).
  • TLDN Temporary Local Directory Number
  • a TLDN may be used by other telephone exchanges to route a call to the switch issuing the TLDN. Having received the TLDN the mobile station 310 continues roaming and the mobile station 310 or the WLAN switch or both may find 3006 that the connectivity between the mobile station 310 and the WLAN switch has been lost.
  • the WLAN switch temporarily places 3008 party A on hold (WLAN may inform Party A about the on going state of affairs by playing a pre-recorded announcement).
  • the mobile station 310 upon sensing the WWAN environment and upon successful completion of registration in the WWAN environment, requests a call to be placed using the TLDN as the destination (called party).
  • the WWAN switch routes 3010 the call to the WLAN switch using its routing logic dependent on the TLDN.
  • the WLAN switch recognizes 3012 the TLDN and connects Party A to the incoming call.
  • Party A and the MS resume the on going call albeit with an interruption.
  • PBX Private Branch Exchange
  • PBX systems typically provide a feature-rich environment to the attached telephones, such as abbreviated dialing, multi-party calls and the like.
  • a WLAN switch may be used in conjunction with a PBX system.
  • FIG 31 shows an exemplary embodiment of this arrangement.
  • the WLAN 200 is connected to the PBX 3102 via standard supported interfaces such as ISDN PRI.
  • Telephone calls originating from a handset connected to the PBX and destined for a WLAN-controlled handset may be delivered to the WLAN switch 3104 via the standard interface.
  • the WLAN switch may use the standard interface to deliver telephone calls to the PBX.
  • a mobile station 310 may make calls using the WLAN air interface, and such calls will be communicated over the wired LAN 206 to WLAN switch 2904 via the JP links of LAN 206.
  • Switch 3104 will then communicate the call signaling (and eventually voice or other data) over ISDN PRI link 3106 to the PBX switch 3102 which will handle the call as if it were from a PBX phone 3108 and thus provide the PBX services to the mobile station.
  • the PBX would make the appropriate connections and communication would be conducted via the PBX switch 3102.
  • the WLAN switch 3104 essentially acts as a protocol converter, receiving the mobile station signaling and data as IP and providing it to the PBX via the ISDN PRI links as ISDN information.
  • the WLAN switch 3104 detects that the mobile station desires to call an outside party. This may be done by analyzing the called party information, for example, to see if certain numbering plan information is used, such as prefixing the called number with the number '9'.
  • the switch 3104 communicates with the WWAN switch 3112 and requests a TLDN to be later associated with the called party information e.g., called party number "123."
  • the switch 3104 then makes a request to the PBX switch 3102 via link 3106 to connect the circuits associated with the mobile station to the WWAN switch 3112 using the TLDN i.e., requests the PBX to connect a call to the TLDN as the called party.
  • the WWAN switch 3112 recognizes that the incoming call request with TLDN is for the previously remembered called party number 123 (i.e., WWAN switch 3104 associates the issued TLDN with previously received called party number "123” from WLAN switch 3104) and proceeds to route call to called party number "123" as dictated by standard routing logic.
  • PBX 3102 requests call to destination TLDN but WWAN switch 3112 recognizes that the call is actually meant for destination "123” and routes the call to "123".
  • the TLDN serves as a tag identifying the "signaling" on IP link 3114 and the request from the PBX on ISDN PRI link 3110. In this fashion, any subsequent signaling or link 3114 associated with mobile station 310 will be associated with the correct bearer circuits on link 3110.
  • a handoff may proceed with regard to the use of TLDN as a handoff mechanism - namely as the mobile station roams into a WWAN area and loses radio contact with the WLAN, the mobile station will perform a handoff by automatically reconnecting with the call by using the TLDN.
  • the WLAN switch may inform the mobile station of the TLDN to use either during call set up, or as explained above in response to the mobile station's request (e.g., the WLAN switch 3104 may cache the TLDN and await the request of the mobile station).
  • the WWAN MSC 3112 anchors the call.
  • the WWAN MSC may tear down the links previously used to the PBX. This is efficient for two party calls.
  • the links to the PBX must remain up. In this situation, the WWAN MSC 3112 must patch in the mobile station to the existing call.

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Abstract

L'invention concerne un procédé, un système et un appareil permettant d'interconnecter un réseau longue portée sans fil (WWAN) et un réseau local sans fil (RL sans fil). L'invention concerne plus particulièrement un procédé, un système et un appareil de fourniture de services à une station mobile servie par un réseau local sans fil. Un centre de commutation mobile est conçu pour servir un réseau local sans fil. Le centre de commutation mobile qui sert le réseau local sans fil reçoit des messages WWAN fournissant un service WWAN. Ledit centre de commutation mobile forme des messages SIP au moyen des messages WWAN reçus, et distribue lesdits messages SIP au réseau local sans fil, par l'intermédiaire d'une liaison de protocole Internet. Le réseau local sans fil distribue les messages SIP à la station mobile par l'intermédiaire d'un protocole d'interface hertzienne de réseau local sans fil. Dans un mode de réalisation, le service WWAN est un service de messages courts (SMS). Dans un autre mode de réalisation, le service WWAN est une notification d'attente de message (MWN). Dans un autre mode de réalisation, un centre de commutation mobile servant le réseau local sans fil et un centre de commutation mobile servant le WWAN coopèrent pour fournir des services d'appel TFO entre une station mobile fonctionnant dans le réseau local sans fil et une station mobile fonctionnant dans le WWAN.
EP20030710630 2002-01-02 2003-01-02 Procede, systeme et appareil de fourniture de services de reseau longue portee sans fil a une station mobile servie par un reseau local sans fil Withdrawn EP1470729A2 (fr)

Applications Claiming Priority (11)

Application Number Priority Date Filing Date Title
US52080 1998-03-31
US34580002P 2002-01-02 2002-01-02
US345800P 2002-01-02
US52119 2002-01-17
US52127 2002-01-17
US10/052,080 US20030134650A1 (en) 2002-01-17 2002-01-17 Method, system and apparatus for internetworking a mobile station to operate in a WWAN environment and in a WLAN environment with PBX services
US10/052,119 US20030133421A1 (en) 2002-01-17 2002-01-17 Method, system and apparatus for providing WWAN services to a mobile station serviced by a WLAN
US10/052,081 US7200112B2 (en) 2002-01-02 2002-01-17 Method, system, and apparatus for a mobile station to sense and select a wireless local area network (WLAN) or a wide area mobile wireless network (WWAN)
US52081 2002-01-17
US10/052,127 US7149521B2 (en) 2002-01-02 2002-01-17 Method, system and apparatus for providing mobility management of a mobile station in WLAN and WWAN environments
PCT/US2003/000086 WO2003061177A2 (fr) 2002-01-02 2003-01-02 Procede, systeme et appareil de fourniture de services de reseau longue portee sans fil a une station mobile servie par un reseau local sans fil

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AU2003214799A1 (en) 2003-07-30
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WO2003061177A3 (fr) 2004-03-25
WO2003061177A2 (fr) 2003-07-24

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