WO1989007380A1 - Trunked communication system with nationwide roaming capability - Google Patents

Trunked communication system with nationwide roaming capability Download PDF

Info

Publication number
WO1989007380A1
WO1989007380A1 PCT/US1988/004712 US8804712W WO8907380A1 WO 1989007380 A1 WO1989007380 A1 WO 1989007380A1 US 8804712 W US8804712 W US 8804712W WO 8907380 A1 WO8907380 A1 WO 8907380A1
Authority
WO
WIPO (PCT)
Prior art keywords
trunked
roaming
subscriber
trunked communication
repeaters
Prior art date
Application number
PCT/US1988/004712
Other languages
French (fr)
Inventor
Richard Alan Comroe
Kenneth John Zdunek
Original Assignee
Motorola, 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
Application filed by Motorola, Inc. filed Critical Motorola, Inc.
Priority to EP89901513A priority Critical patent/EP0398911B1/en
Priority to AU29335/89A priority patent/AU618068B2/en
Priority to BR888807880A priority patent/BR8807880A/en
Priority to DE3855136T priority patent/DE3855136T2/en
Priority to KR1019890701765A priority patent/KR930000798B1/en
Priority to JP1501498A priority patent/JP2757515B2/en
Publication of WO1989007380A1 publication Critical patent/WO1989007380A1/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/08Trunked mobile radio systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/08Testing, supervising or monitoring using real traffic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/26Network addressing or numbering for mobility support

Definitions

  • This invention relates generally to trunked communication systems, and more specifically to trunked communication systems which enable subscriber units to roam from system to system, and is more particularly directed toward a trunked communication system having nationwide roaming capability.
  • Trunked communication systems are known.
  • a central controller allocates a limited number of communication channels among a plurality of subscriber units.
  • a subscriber may be a mobile unit, portable unit or a control station.
  • a mobile unit is a trunked subscriber unit designed to be installed in a vehicle
  • a portable unit is a trunked subscriber unit designed to be carried on or about the person
  • a control station is a trunked subscriber unit design to be permanently or semi-permanently installed in a building or other fixed location.
  • Each subscriber has an identification (ID) code, which, together with other information, comprises a call request that is transmitted to the central controller thereby indicating that the subscriber desires access to one of the communication channels.
  • ID identification
  • the call request is encoded with error correcting or other codes to form inbound signalling words (ISWs) to facilitate communications.
  • ISWs are transmitted to the central controller over a selected one of the communication channels. This channel is commonly referred to as the control channel.
  • the particular communication channel used as the control channel is periodically changed as a control measure.
  • each subscriber monitors the control channel.
  • the central receives the call request ISW from a requesting (i.e., the calling) subscriber, it returns a channel grant outbound signalling word (OSW) if a channel is available.
  • OSW channel grant outbound signalling word
  • both the calling subscriber and the called subscriber(s) leave the control channel and move to the assigned communication channel to participate in the call. If, however, all the channels are in use, the central controller returns a "Busy" OSW and the subscriber must wait until a channel becomes available.
  • trunked communication system In addition to subscriber-to-subscriber calls, it is known to interconnect the trunked communication system with, the public telephone system. Generally, the central controller must be programmed to recognize that the subscriber's ID is authorized for such interconnect service. In this way, an authorized trunked subscriber can receive and initiate interconnect calls with "land line" (i.e., private homes or offices) parties.
  • "land line" i.e., private homes or offices
  • the communication range of a trunked system while dependent on transmitter power and other factors, is generally twenty (20) miles (i.e., a system diameter of forty (40) miles) . Within range, it is manifest that the mobile and portable subscribers may roam at will. If a subscriber should roam outside the range the trunked system, the subscriber would "lose” (i.e., be unable to receive) the control channel. In such cases, communication is not possible.
  • selected regional trunked systems are equipped with telephone interconnect capability and provided with local computers, which communicate with a national hub computer.
  • the trunked systems are selected such that the selected systems in each region form a communication network, which preferably is nationwide in scope.
  • several IDs are reserved as "roaming IDs" to be temporarily assigned to roaming subscribers.
  • a roaming ID is assigned and transmitted to the subscriber, which thereafter operates within the new trunked system using the roaming ID.
  • the roaming assignment is transmitted to the national hub computer so that interconnect calls may be properly forwarded.
  • the roaming subscriber continues to operate under the assigned roaming ID until it roams out of the range of the current system and into yet another trunked system. In this way, the subscribers may roam from system to system.
  • Figure 1 is a block diagram of the networked trunked communication system supporting roaming
  • Figure 2 is a flow diagram illustrating the steps executed by a roaming subscriber to obtain a roaming ID
  • Figure 3 is a flow diagram illustrating the steps executed by each local computer of Figure 1;
  • Figure 4 is a flow diagram illustrating the steps executed by the hub computer of Figure 1;
  • FIG. 5 is a flow diagram illustrating the call routing aspect of the present invention. Detailed Description of the Preferred Embodiment
  • each of the trunking systems (A, B, and C) include a central controller (102 a-c) , which allocates several repeaters (104 a-c) among a plurality of subscriber units.
  • Each of the central controllers is also coupled to a local computer (106 a-c) , which performs several administrative functions including, but not limited to, allocating and assigning roaming ID codes, communicating and requesting status information to and from the hub computer (110) , and dynamically reprogram ing the roaming subscriber units so that they may operate within any systems.
  • the central controllers (102 a-c) are also coupled to the local public switched telephone network (PSTN) (108 a-c) so that telephone interconnect calls can be established between the subscribers and landline parties.
  • PSTN public switched telephone network
  • Each of the local computers (106 a-c) are coupled to the centralized hub computer (110) , which operates as the central data collection and information retrieval point for the networked system (100) .
  • the local computers (106 a-c) may be coupled (114 a-c) to the hub computer (110) by any suitable means, including leased telco lines, microwave link, or any other suitable data communication channel. Alternately, if suitable bandwidth and transmission time are available, the local computers (106 a-c) may communicate with the hub computer (110) via the public switched telephone networks (108 a-d) .
  • Each subscriber unit operating within a local trunked communication system has stored therein a unit identification (ID) code, and the ID code of its "home” system. While the subscriber unit (112) resides and operates within its "home” system, a subscriber may request and receive communication channels by transmitting its unit ID code to the "home" central controller (i.e., either 102a, 102b, or 102c) as a call request. The subscriber units will operate within the "home” system as long as it continues to receive the "home” system's control channel.
  • ID unit identification
  • the subscriber When a subscriber roams to the fringe of a local communication system's range, the subscriber will experience OSW decoding errors as the control channel information becomes weaker. At a suitable threshold point, the subscriber unit may determine that the errors are so great that it is no longer properly receiving its "home" control channel.
  • the subscriber (112') may begin scanning the available channels in search of a new control channel.
  • subscriber units may easily identify a control channel due to the continuous nature of transmission of outbound signalling words (OSW's) transmitted by the central controllers (102a-c) .
  • OSW's outbound signalling words
  • the subscriber unit waits a suitable period of time to determine whether the newly identified control channel supports roaming.
  • a trunked central controller that supports roaming may periodically transmit a roaming support message interleaved among the outbound signalling words.
  • the roaming subscriber (112') may attempt to "register" on that system as a roaming subscriber by transmitting a roaming request code.
  • the central controller may interact with its local computer to determine if there are any roaming ID's are available.
  • a subset of the available ID codes on a trunked communication system are reserved as roaming IDs. In any particular implementation this may be a fixed subset of the ID codes, or the size of the subset may be dynamically altered depending upon the loading of the particular trunked system.
  • the local computer may establish a cross-reference between the subscriber's unit ID and home system ID to the roaming ID that will be assigned to the subscriber.
  • the roaming ID is returned to the subscriber, which thereafter operates within the new system using the roaming ID.
  • the home system and unit ID of the roaming subscriber (112') are forwarded to the hub computer (110) , maintains a record of which system a roaming subscriber is operating upon. In this way, billing information may be properly forwarded to the roaming subscriber (112 » ).
  • a centralized repository of information is automatically generated so that a dispatcher of any local system may query the hub computer (110) to find out which system its subscriber is registered (operating) upon.
  • the subscriber (112') may transmit its roaming request to central controller system B to attempt to register as a roaming subscriber. If successful, the hub computer (110) will be updated to reflect that the subscriber (112') is now operating in system B. Should the dispatcher of system A desire to contact the subscriber (112'), she may contact the hub computer (110) by the PSTN (or optionally by directing a query to the central controller and the local computer of the home system) .
  • the dispatcher may determine which system the subscriber (112') is operating (registered) upon, and receive the telephone number of that system's central controller (102b) to use to establish a telephone interconnect call.
  • a dispatcher in Milwaukee, Wisconsin may be informed that its subscriber is operating within the Chicago trunked system, and, after placing a telephone call to the Chicago trunked central controller, establish communication with the subscriber.
  • dispatchers may communicate with its subscribers using the public switch telephone network as the long-distance carrier, and communicate by wireless communication over whichever trunked communication system that the subscriber (112') has roamed into.
  • the registration process would be repeated and the hub computer (110) would be informed that the subscriber has roamed into system C.
  • the hub computer (110) Upon storing and cross-referencing this information, the hub computer (110) would determine that the roaming subscriber no longer requires the roaming ID for system B. Accordingly, the hub computer would thereafter contact the local computer (106 b) informing it that the subscriber's roaming ID is no longer required. In this way, roaming ID's may be reallocated for use to other roaming subscribers.
  • FIG. 2 a flow diagram illustrating the steps executed by a roaming subscriber to register on a new trunked system is shown.
  • decision 200 the subscriber determines whether it is receiving a control channel. So long as the subscriber determines that it is receiving a control channel, it will operate in that system whether it is its "home" system or a roaming system.
  • the routine proceeds to step 202, where the subscriber scans for a control channel.
  • the subscriber may scan for the control channel in any suitable manner, including scanning every single available channel, or scanning an identified subset of control channel frequencies, or, the subscriber may be informed by additional information in the roaming support code word transmitted by a roaming supportive system of the control channels of each adjacent system that a subscriber could roam into. In this way, a relatively few number of channels would have to be scanned before a proper control channel was identified.
  • Decision 204 determines whether or not the subscriber has found a control channel. If not, scanning continues until a control channel is found, after which the routine proceeds to decision 206 to determine whether the central controller transmitting the control channel supports roaming. As previously mentioned, this is determined by decoding a roaming support code word, which may include additional information such as, for example, the frequencies of the control channels of all adjacent systems supporting roaming, any particular additional features that the central controller supports, the proper connect tones to be used, or other suitable control or status messages.
  • the roaming support code word is transmitted periodically by the central controller and after waiting an appropriate amount of time the subscriber may determine that a control channel does not support roaming. In such a case, the routine proceeds to reference letter B where scanning continues in step 202.
  • step 208 the routine transmits its unit ID and home system ID to request a roaming ID. If a roaming ID is available it is cross-referenced by the local computer, which then forwards the new roaming ID to the subscriber (step 210). Thereafter, in step 212, the subscriber unit stores the roaming ID and operates within the new system using this ID for all communication activity.
  • the local computer determines whether it has received a roaming ID request. If so, the routine proceeds to step 302, where the local computer assigns and cross references the assigned roaming ID to the subscriber's unit ID and home system ID. In step 304, the local computer (via the central controller) transmits the roaming ID to the roaming subscriber, after which (step 306) the local computer transmits the subscriber ID and the local computer's system ID to the hub computer. The routine then returns to reference letter C. If the local computer has not received a roaming ID request, decision 308 determines whether it has received a roaming ID de-assignment instruction from the hub computer (110) .
  • the hub computer (110) determines that the subscriber's roaming ID used in the previous system may be reassigned to another subscriber, or to the "pool" (subset) of roaming IDs. Accordingly, in step 310, the local computer returns the roaming ID to the pool of available IDs and returns control to reference letter C.
  • Step 312 determines whether the local computer requires status information from the hub computer (110) . If so, the local computer transmits a status request and the subscriber unit ID to the hub computer (step 314) .
  • the hub computer cross-references the subscriber's unit ID to its roaming ID, and determines the system ID of the trunked system that the subscriber is currently operating within, and returns the status information to the local computer (step 316) . Following this, the routine proceeds to reference letter C.
  • Decision 332 determines whether the central controller has requested a cross-reference to a roaming ID for an interconnect call. Ordinarily this occurs when a landline party calls the central controller via the PSTN. Thus, the central sends a request to its local computer to cross-reference to the subscriber's unit ID to its roaming ID so that the central may establish a telephone interconnect call. Thus, in step 334, the local computer receives the cross-reference request and the subscriber's unit ID from the central controller. In step 336, the local computer cross-references the subscriber's unit ID to determine its roaming ID. Step 338 returns the roaming ID to the central, so that the central may contact the subscriber over the control channel to establish the telephone interconnect call. In this way, the local computer handles the roaming administrative and assignment functions, thereby providing the improved capability afforded by the present invention without significantly overloading the central controller from performing its normal call handling and assignment functions.
  • step 400 the hub computer determines whether it has received a roaming ID assignment update. If so, decision 402 determines whether the subscribers unit ID has previously been assigned a roaming ID. If so, the hub computer may determine that the subscriber has left one roaming system and has travelled to another. In such case, the hub computer (in step 404) transmits a de-assignment packet to the previous trunking system so that the roaming ID may be reallocated to another roaming subscriber. If the subscriber had not previously been assigned a roaming ID, decision 402 returns control to reference letter D.
  • Step 406 determines whether the hub computer has received a status request over the PSTN network or from the local computers.
  • the status information will comprise a request by a landline party for the current system in which a particular subscriber is operating.
  • the status request code word ordinarily would contain the unit ID of a subscriber unit.
  • the hub computer may then cross-reference the subscriber's unit ID and return to the requesting party the system identity and the telephone number of the central controller of that system. If the determination of decision 406 is that a status request has been received, step 408 formats and sends the appropriate status information to the requesting party (landline or local computer) , after which control is returned to reference letter D.
  • One alternative to forwarding landline calls to roaming parties comprises the hub computer handling the call interconnection from a central location. Accordingly, as an optional implementation, decision 410 determines whether a telephone interconnect call request has been received. If so, the hub computer cross- references the subscriber's unit ID to find the system ID that the subscriber is currently operating upon (step 412) . In step 414, the hub computer calls the local system via the PSTN. In step 416, the hub computer waits until the local system has cross-referenced the unit ID to the roaming ID and establishes a telephone inter ⁇ connect call with the subscriber. In step 418, the hub computer interconnects the landline party to the central controller where the roamer is operating, to allow the call to take place. After the call is completed, control is again returned to reference letter D.
  • step 500 the routine proceeds to step 502, where the landline party accesses the hub computer via the PSTN to request the subscriber's location (i.e., the system ID and phone number of the central the subscriber currently communicates through).
  • the landline party receives the subscribers location (roaming system ID) and the telephone number of the central controller from the hub computer. The landline party may then access the central controller where the subscriber is operating via the PSTN (step 506) .
  • step 510 the call commences after the central controller where the subscriber is operating establishes the interconnection with the subscriber.
  • the landline party transmits a telephone interconnect call request to the central (step 508) .
  • the landline party may access the hub computer (110) via the PSTN and transmit a telephone interconnect call request, which normally would include the subscribers unit ID (step 512).
  • the call would begin after the hub computer contacts the local computer and establishes the call (see steps 412-418) .
  • the hub computer (110) is responsible for all interconnections and switching of calls. While it is desirable to centralize this function, the switching and processing requirements for a nationwide system may be so enormous that it is not practical to have one centralized location for switching. For this reason, the interconnect call described in steps 502-510 is preferred.
  • landline parties need only contact one centralized location to get information or contact a roaming subscriber.
  • only one telephone number need be remembered, stored or dialed to obtain status information, such as, for example, the roaming subscriber's current system.
  • the long distance link is maintained via the PSTN, which is locally interconnected by a wireless communication channel to provide exchange between the landline party and the roaming subscriber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Function (AREA)
  • Exchange Systems With Centralized Control (AREA)

Abstract

Selected regional trunking systems are equipped with telephone interconnect capability and provided with local computers (106), which communicate with a national hub computer (110). At each selected trunking system, several IDs are reserved as ''roaming IDs'' to be temporarily assigned to roaming subscribers (112). When a subscriber determines that it has roamed into a new trunked system, it requests a roaming ID. A roaming ID is assigned and transmitted to the subscriber, which thereafter operates within the new trunked system using its roaming ID. The roaming assignment is also transmitted to the national hub computer (110) so that interconnect calls may be appropriately properly forwarded. The roaming subscriber (112) continues to operate under the assigned roaming ID until it roams out of the range of the current system and into yet another trunked system. In this way, the subscribers may roam from system to system.

Description

TRUNKED COMMUNICATION SYSTEM WITH NATIONWIDE ROAMING CAPABILITY
Technical Field
This invention relates generally to trunked communication systems, and more specifically to trunked communication systems which enable subscriber units to roam from system to system, and is more particularly directed toward a trunked communication system having nationwide roaming capability.
Background Art
Trunked communication systems are known. In a typical trunked system, a central controller allocates a limited number of communication channels among a plurality of subscriber units. Generally, a subscriber may be a mobile unit, portable unit or a control station. As used herein, a mobile unit is a trunked subscriber unit designed to be installed in a vehicle, a portable unit is a trunked subscriber unit designed to be carried on or about the person, and a control station is a trunked subscriber unit design to be permanently or semi-permanently installed in a building or other fixed location. Each subscriber has an identification (ID) code, which, together with other information, comprises a call request that is transmitted to the central controller thereby indicating that the subscriber desires access to one of the communication channels. Normally, the call request is encoded with error correcting or other codes to form inbound signalling words (ISWs) to facilitate communications. The subscriber ISWs are transmitted to the central controller over a selected one of the communication channels. This channel is commonly referred to as the control channel. Generally, the particular communication channel used as the control channel is periodically changed as a control measure.
When not participating in a call, each subscriber monitors the control channel. When the central receives the call request ISW from a requesting (i.e., the calling) subscriber, it returns a channel grant outbound signalling word (OSW) if a channel is available. Upon receipt of the channel grant OSW, both the calling subscriber and the called subscriber(s) leave the control channel and move to the assigned communication channel to participate in the call. If, however, all the channels are in use, the central controller returns a "Busy" OSW and the subscriber must wait until a channel becomes available.
In addition to subscriber-to-subscriber calls, it is known to interconnect the trunked communication system with, the public telephone system. Generally, the central controller must be programmed to recognize that the subscriber's ID is authorized for such interconnect service. In this way, an authorized trunked subscriber can receive and initiate interconnect calls with "land line" (i.e., private homes or offices) parties.
The communication range of a trunked system, while dependent on transmitter power and other factors, is generally twenty (20) miles (i.e., a system diameter of forty (40) miles) . Within range, it is manifest that the mobile and portable subscribers may roam at will. If a subscriber should roam outside the range the trunked system, the subscriber would "lose" (i.e., be unable to receive) the control channel. In such cases, communication is not possible.
Clearly, contemporary trunked communication systems presuppose that intra-system roaming completely serves the needs of the subscribers. Generally, this assumption may be valid for the subscriber that travels locally between home and office, or from one local customer to the next. However, preventing inter-system roaming inherently limits and dis-serves the needs of several other types of subscribers. Examples of such other subscribers include, but are not limited to, state-wide, multi-state, or regional sales, service, or law enforcement organizations, and medium or long range trucking or carrier companies. In fact, as a general statement, any subscriber that has a more than an infrequent need to travel beyond the communication range of its home trunking system could benefit by inter-system roaming.
Summary of the Invention
Accordingly, it is an object of the present invention to provide an improved trunked communication system.
It is another object of the present invention to provide for inter-system roaming of subscribers.
It is a further object of the present invention to provide for nationwide roaming of trunked subscribers.
It is yet another object of the present invention to provide location information on roaming subscribers.
It is yet a further object of the present invention to automatically forward interconnect calls to a roaming subscriber irrespective of which trunked system the subscriber is currently operating within. Briefly, according to the invention, selected regional trunked systems are equipped with telephone interconnect capability and provided with local computers, which communicate with a national hub computer. The trunked systems are selected such that the selected systems in each region form a communication network, which preferably is nationwide in scope. At each selected trunked system, several IDs are reserved as "roaming IDs" to be temporarily assigned to roaming subscribers. When a subscriber determines that it has roamed into a new trunked system, it requests a roaming ID. A roaming ID is assigned and transmitted to the subscriber, which thereafter operates within the new trunked system using the roaming ID. The roaming assignment is transmitted to the national hub computer so that interconnect calls may be properly forwarded. The roaming subscriber continues to operate under the assigned roaming ID until it roams out of the range of the current system and into yet another trunked system. In this way, the subscribers may roam from system to system.
Brief Description of the Drawings
Figure 1 is a block diagram of the networked trunked communication system supporting roaming;
Figure 2 is a flow diagram illustrating the steps executed by a roaming subscriber to obtain a roaming ID;
Figure 3 is a flow diagram illustrating the steps executed by each local computer of Figure 1;
Figure 4 is a flow diagram illustrating the steps executed by the hub computer of Figure 1;
Figure 5 is a flow diagram illustrating the call routing aspect of the present invention. Detailed Description of the Preferred Embodiment
Referring now to Figure 1, three trunked communication systems (A, B, and C) are coupled to a central hub computer (110) . Preferably, each of the trunking systems (A, B, and C) include a central controller (102 a-c) , which allocates several repeaters (104 a-c) among a plurality of subscriber units. Each of the central controllers is also coupled to a local computer (106 a-c) , which performs several administrative functions including, but not limited to, allocating and assigning roaming ID codes, communicating and requesting status information to and from the hub computer (110) , and dynamically reprogram ing the roaming subscriber units so that they may operate within any systems. Preferably, the central controllers (102 a-c) are also coupled to the local public switched telephone network (PSTN) (108 a-c) so that telephone interconnect calls can be established between the subscribers and landline parties.
Each of the local computers (106 a-c) are coupled to the centralized hub computer (110) , which operates as the central data collection and information retrieval point for the networked system (100) . In the preferred embodiment of the present invention, it is envisioned to have a single hub computer for the entire continental United States. The local computers (106 a-c) may be coupled (114 a-c) to the hub computer (110) by any suitable means, including leased telco lines, microwave link, or any other suitable data communication channel. Alternately, if suitable bandwidth and transmission time are available, the local computers (106 a-c) may communicate with the hub computer (110) via the public switched telephone networks (108 a-d) .
Each subscriber unit operating within a local trunked communication system (A, B, or C) has stored therein a unit identification (ID) code, and the ID code of its "home" system. While the subscriber unit (112) resides and operates within its "home" system, a subscriber may request and receive communication channels by transmitting its unit ID code to the "home" central controller (i.e., either 102a, 102b, or 102c) as a call request. The subscriber units will operate within the "home" system as long as it continues to receive the "home" system's control channel.
When a subscriber roams to the fringe of a local communication system's range, the subscriber will experience OSW decoding errors as the control channel information becomes weaker. At a suitable threshold point, the subscriber unit may determine that the errors are so great that it is no longer properly receiving its "home" control channel.
To maintain communication, (i.e., roam) the subscriber (112') may begin scanning the available channels in search of a new control channel. Typically, subscriber units may easily identify a control channel due to the continuous nature of transmission of outbound signalling words (OSW's) transmitted by the central controllers (102a-c) . Upon finding a new control channel, the subscriber unit waits a suitable period of time to determine whether the newly identified control channel supports roaming. Preferably, only one trunked system within any metropolitan area (or region) will be selected to be part of the roaming network (100) . This limitation is desirable since within any particular metropolitan area there may be several trunked systems (both private and commercial) . According to the present invention, a trunked central controller that supports roaming may periodically transmit a roaming support message interleaved among the outbound signalling words. Upon receiving the roaming support code word, the roaming subscriber (112') may attempt to "register" on that system as a roaming subscriber by transmitting a roaming request code. Upon receipt of the roaming request code, the central controller may interact with its local computer to determine if there are any roaming ID's are available. According to the present invention, a subset of the available ID codes on a trunked communication system are reserved as roaming IDs. In any particular implementation this may be a fixed subset of the ID codes, or the size of the subset may be dynamically altered depending upon the loading of the particular trunked system. Assuming that a roaming ID is available, the local computer may establish a cross-reference between the subscriber's unit ID and home system ID to the roaming ID that will be assigned to the subscriber. The roaming ID is returned to the subscriber, which thereafter operates within the new system using the roaming ID. The home system and unit ID of the roaming subscriber (112') are forwarded to the hub computer (110) , maintains a record of which system a roaming subscriber is operating upon. In this way, billing information may be properly forwarded to the roaming subscriber (112 »). Also, a centralized repository of information is automatically generated so that a dispatcher of any local system may query the hub computer (110) to find out which system its subscriber is registered (operating) upon.
Assuming now that a subscriber (112) (which has system A as its "home" system) roams into system B, the subscriber (112') may transmit its roaming request to central controller system B to attempt to register as a roaming subscriber. If successful, the hub computer (110) will be updated to reflect that the subscriber (112') is now operating in system B. Should the dispatcher of system A desire to contact the subscriber (112'), she may contact the hub computer (110) by the PSTN (or optionally by directing a query to the central controller and the local computer of the home system) . In this way, the dispatcher may determine which system the subscriber (112') is operating (registered) upon, and receive the telephone number of that system's central controller (102b) to use to establish a telephone interconnect call. Thus, a dispatcher in Milwaukee, Wisconsin, may be informed that its subscriber is operating within the Chicago trunked system, and, after placing a telephone call to the Chicago trunked central controller, establish communication with the subscriber. In this way, dispatchers may communicate with its subscribers using the public switch telephone network as the long-distance carrier, and communicate by wireless communication over whichever trunked communication system that the subscriber (112') has roamed into.
Should the subscriber (112') now roam into system C, the registration process would be repeated and the hub computer (110) would be informed that the subscriber has roamed into system C. Upon storing and cross-referencing this information, the hub computer (110) would determine that the roaming subscriber no longer requires the roaming ID for system B. Accordingly, the hub computer would thereafter contact the local computer (106 b) informing it that the subscriber's roaming ID is no longer required. In this way, roaming ID's may be reallocated for use to other roaming subscribers.
Referring now to Figure 2, a flow diagram illustrating the steps executed by a roaming subscriber to register on a new trunked system is shown. In decision 200, the subscriber determines whether it is receiving a control channel. So long as the subscriber determines that it is receiving a control channel, it will operate in that system whether it is its "home" system or a roaming system. When the subscriber has determined that it is no longer receiving a control channel, the routine proceeds to step 202, where the subscriber scans for a control channel. The subscriber may scan for the control channel in any suitable manner, including scanning every single available channel, or scanning an identified subset of control channel frequencies, or, the subscriber may be informed by additional information in the roaming support code word transmitted by a roaming supportive system of the control channels of each adjacent system that a subscriber could roam into. In this way, a relatively few number of channels would have to be scanned before a proper control channel was identified.
Decision 204 determines whether or not the subscriber has found a control channel. If not, scanning continues until a control channel is found, after which the routine proceeds to decision 206 to determine whether the central controller transmitting the control channel supports roaming. As previously mentioned, this is determined by decoding a roaming support code word, which may include additional information such as, for example, the frequencies of the control channels of all adjacent systems supporting roaming, any particular additional features that the central controller supports, the proper connect tones to be used, or other suitable control or status messages. Preferably, the roaming support code word is transmitted periodically by the central controller and after waiting an appropriate amount of time the subscriber may determine that a control channel does not support roaming. In such a case, the routine proceeds to reference letter B where scanning continues in step 202.
When a control channel is found that supports roaming, the routine proceeds to step 208, where the requesting subscriber transmits its unit ID and home system ID to request a roaming ID. If a roaming ID is available it is cross-referenced by the local computer, which then forwards the new roaming ID to the subscriber (step 210). Thereafter, in step 212, the subscriber unit stores the roaming ID and operates within the new system using this ID for all communication activity.
Referring now to Figure 3, the steps executed by a local computer (106 a-c) are illustrated. In decision 300, the local computer determines whether it has received a roaming ID request. If so, the routine proceeds to step 302, where the local computer assigns and cross references the assigned roaming ID to the subscriber's unit ID and home system ID. In step 304, the local computer (via the central controller) transmits the roaming ID to the roaming subscriber, after which (step 306) the local computer transmits the subscriber ID and the local computer's system ID to the hub computer. The routine then returns to reference letter C. If the local computer has not received a roaming ID request, decision 308 determines whether it has received a roaming ID de-assignment instruction from the hub computer (110) . This typically occurs when the subscriber has roamed into yet another system, and the hub computer (110) determines that the subscriber's roaming ID used in the previous system may be reassigned to another subscriber, or to the "pool" (subset) of roaming IDs. Accordingly, in step 310, the local computer returns the roaming ID to the pool of available IDs and returns control to reference letter C.
Decision 312, determines whether the local computer requires status information from the hub computer (110) . If so, the local computer transmits a status request and the subscriber unit ID to the hub computer (step 314) . The hub computer cross-references the subscriber's unit ID to its roaming ID, and determines the system ID of the trunked system that the subscriber is currently operating within, and returns the status information to the local computer (step 316) . Following this, the routine proceeds to reference letter C.
Decision 332 determines whether the central controller has requested a cross-reference to a roaming ID for an interconnect call. Ordinarily this occurs when a landline party calls the central controller via the PSTN. Thus, the central sends a request to its local computer to cross-reference to the subscriber's unit ID to its roaming ID so that the central may establish a telephone interconnect call. Thus, in step 334, the local computer receives the cross-reference request and the subscriber's unit ID from the central controller. In step 336, the local computer cross-references the subscriber's unit ID to determine its roaming ID. Step 338 returns the roaming ID to the central, so that the central may contact the subscriber over the control channel to establish the telephone interconnect call. In this way, the local computer handles the roaming administrative and assignment functions, thereby providing the improved capability afforded by the present invention without significantly overloading the central controller from performing its normal call handling and assignment functions.
Referring now to Figure 4, the steps executed by the hub computer (110) are illustrated. In step 400, the hub computer determines whether it has received a roaming ID assignment update. If so, decision 402 determines whether the subscribers unit ID has previously been assigned a roaming ID. If so, the hub computer may determine that the subscriber has left one roaming system and has travelled to another. In such case, the hub computer (in step 404) transmits a de-assignment packet to the previous trunking system so that the roaming ID may be reallocated to another roaming subscriber. If the subscriber had not previously been assigned a roaming ID, decision 402 returns control to reference letter D.
Decision 406 determines whether the hub computer has received a status request over the PSTN network or from the local computers. Generally, the status information will comprise a request by a landline party for the current system in which a particular subscriber is operating. Thus, the status request code word ordinarily would contain the unit ID of a subscriber unit. The hub computer may then cross-reference the subscriber's unit ID and return to the requesting party the system identity and the telephone number of the central controller of that system. If the determination of decision 406 is that a status request has been received, step 408 formats and sends the appropriate status information to the requesting party (landline or local computer) , after which control is returned to reference letter D.
One alternative to forwarding landline calls to roaming parties comprises the hub computer handling the call interconnection from a central location. Accordingly, as an optional implementation, decision 410 determines whether a telephone interconnect call request has been received. If so, the hub computer cross- references the subscriber's unit ID to find the system ID that the subscriber is currently operating upon (step 412) . In step 414, the hub computer calls the local system via the PSTN. In step 416, the hub computer waits until the local system has cross-referenced the unit ID to the roaming ID and establishes a telephone inter¬ connect call with the subscriber. In step 418, the hub computer interconnects the landline party to the central controller where the roamer is operating, to allow the call to take place. After the call is completed, control is again returned to reference letter D.
Referring now to Figure 5, the call routing aspect of the present invention are illustrated. Assuming that a landline party desires to call a roaming subscriber unit (step 500) the routine proceeds to step 502, where the landline party accesses the hub computer via the PSTN to request the subscriber's location (i.e., the system ID and phone number of the central the subscriber currently communicates through). In step 504, the landline party receives the subscribers location (roaming system ID) and the telephone number of the central controller from the hub computer. The landline party may then access the central controller where the subscriber is operating via the PSTN (step 506) . In step 510, the call commences after the central controller where the subscriber is operating establishes the interconnection with the subscriber. Next the landline party transmits a telephone interconnect call request to the central (step 508) .
As an alternate method of establishing interconnect calls, the landline party may access the hub computer (110) via the PSTN and transmit a telephone interconnect call request, which normally would include the subscribers unit ID (step 512). In step 514, the call would begin after the hub computer contacts the local computer and establishes the call (see steps 412-418) . In this alternate embodiment, the hub computer (110) is responsible for all interconnections and switching of calls. While it is desirable to centralize this function, the switching and processing requirements for a nationwide system may be so enormous that it is not practical to have one centralized location for switching. For this reason, the interconnect call described in steps 502-510 is preferred.
In either alternative, landline parties need only contact one centralized location to get information or contact a roaming subscriber. Thus, only one telephone number need be remembered, stored or dialed to obtain status information, such as, for example, the roaming subscriber's current system. In this way, a fundamental vehicle location feature is afforded by the present invention. For actual voice or data communication with a roaming subscriber, the long distance link is maintained via the PSTN, which is locally interconnected by a wireless communication channel to provide exchange between the landline party and the roaming subscriber.
What is claimed is:

Claims

Claims
1. A method for a subscriber unit to roam from a first trunked communication system to a second trunked communication system, comprising the steps of:
(a) determining that communication with said first trunked communication system has been lost;
(b) requesting an identification code from said second trunked communication system; and
(c) operating, thereafter, in said second trunked , . . . . . communication system under said identification code until communication with said second trunked communication system is lost.
2. The method of claim 1, wherein said step of determining that communication with said first trunked communication system has been lost comprises determining that reception of an information signal from a predetermined communication channel is not practicable due to an unacceptably high error rate.
3. The method of claim 1, wherein said step of requesting an identification code from said second trunked communication system comprises the steps of:
(bl) scanning for a control channel;
(b2) transmitting on said control channel a request for said identification code;
(b3)„ receiving from said second trunking system said identification code; and
(b4) storing said identification code.
4. The method of claim 1, wherein said step of requesting an identification code from said second trunked communication system comprises the steps of:
(bl) scanning for a control channel;
(b2) receiving a predetermined code word from said control channel;
(b3) transmitting on said control channel a request for said identification code;
(b4) receiving from said second trunking system said identification code; and
(b5) storing said identification code.
5. A network of trunked communication systems constructed and arranged to support subscriber units roaming from system to system, comprising: a central computer for communicating with at least two trunked communication systems; said at least two trunked communication systems, each comprising: a plurality of trunked repeaters; central control means for allocating said plurality of trunked repeaters among a plurality of subscriber units, and for communicating information with at least some of said plurality of subscriber units on a selected one of said plurality of trunked repeaters, and including means for . transmitting a predetermined code word on said selected one of said plurality of trunked repeaters; means for communicating with said central computer and for assigning identification codes to roaming subscriber units; means for interfacing with a telephone network; and said plurality of subscriber units, at least some of which have: means for communi.cating with said central control means of each of said at least two trunked communication systems over said selected one of said plurality of trunked repeaters regardless of whether said selected one of said selected plurality of trunked repeaters used by each of said central control means of said at least two trunked communication systems has a different communication frequency; . . . . . means for determining that communication with said central control means of one of said at least two trunked communication systems is not possible; and means for requesting an identification code from a central control means from another of said at least two trunked communication
5 systems.
10
15
20
25
30
35
6. In a network of trunked communication systems constructed and arranged to support subscriber units roaming from system to system and having a central computer for communicating with at least two trunked communication systems, and each of the at least two trunked communication systems having: a plurality of trunked repeaters; central control means for allocating said plurality of trunked repeaters among a plurality of subscriber units, and for communicating information with at least some of said plurality of subscriber units on a selected one of said plurality of trunked repeaters, and including means for transmitting a predetermined code word on said selected one of said plurality of trunked repeaters; means for communicating with said central computer and for assigning identification codes to roaming subscriber units; and means for interfacing with a telephone network, a method for establishing an interconnect call with a subscriber unit operating in any of the at least two trunked communication systems, comprising the steps of:
(a) contacting said central computer;
(b) transmitting at least a unit identification of a subscriber unit to said central computer;
(c) receiving an information signal representing a public telephone number associated with the particular trunked communication system that the subscriber unit having said unit identification is operating in;
(d) accessing said particular trunked communication system via said telephone network; (e) transmitting said unit identification of said subscriber unit to said particular trunked communication system;
(f) communicating with said subscriber unit after said particular trunked communication 5 system determines the identification code currently assigned to said unit identification and establishes a wireless communication channel.
10
15
20
25
30
35
7. In a network of trunked communication systems constructed and arranged to support subscriber units roaming from system to system and having a central computer for communicating with at least two trunked communication systems, wherein each of the at least two . trunked communication systems comprises: a plurality of trunked repeaters; central control means for allocating said plurality of trunked repeaters among a plurality of subscriber units, and for communicating information with at least some of said plurality of subscriber units on a selected one of said plurality of trunked repeaters, and including means for transmitting a predetermined code word on said selected one of said plurality of trunked repeaters which represents that roaming subscriber units may communicate with said central control means to operate within the particular trunked communication system associated with said central control means; means for communicating with said central computer and for assigning identification codes to roaming subscriber units; and means for interfacing with a telephone network.
8. In a network of trunked communication systems constructed and arranged to support subscriber units roaming from system to system and having a central computer for communicating with at least two trunked communication systems, and each of the at least two trunked communication systems having: a plurality of trunked repeaters; central control means for allocating said plurality of trunked repeaters among a plurality of subscriber units, and for communicating information with at least some of said plurality of subscriber units on a selected one of said plurality of trunked repeaters; means for communicating with said central computer and for assigning identification codes to roaming subscriber units; and means for interfacing with a telephone network, a signalling method for supporting roaming subscriber units, comprising the steps of:
(a) transmitting a predetermined code on said selected one of said plurality of trunked repeaters, which may be used to identify roaming support capability;
(b) receiving a roaming request code from a subscriber unit; (c) assigning a roaming identification code to said subscriber unit;
(d) transmitting said roaming identification code to said subscriber unit.
9. The method of claim 9, which includes the step of: (al) transmitting an information signal with said predetermined code.
10. The method of claim 9, which includes the step of: (al) transmitting an information signal representing the frequency of a control channel used by any adjacent trunked communication system that supports roaming.
11. The method of claim 9, which includes the step of: (al) transmitting an information signal representing connect tone frequencies used to communicate over the trunked communication system.
PCT/US1988/004712 1988-01-27 1988-12-30 Trunked communication system with nationwide roaming capability WO1989007380A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP89901513A EP0398911B1 (en) 1988-01-27 1988-12-30 Trunked communication system with nationwide roaming capability
AU29335/89A AU618068B2 (en) 1988-01-27 1988-12-30 Trunked communication system with nationwide roaming capability
BR888807880A BR8807880A (en) 1988-01-27 1988-12-30 PROCESS FOR A SUBSCRIBER UNIT TRANSIT FROM A FIRST COMMON COMMUNICATION SYSTEM TO A SECOND COMMUNICATION COMMUNICATION SYSTEM, NETWORK OF COMMUNICATION COMMUNICATION SYSTEMS, PROCESS FOR ESTABLISHING A SIGNAL CALL
DE3855136T DE3855136T2 (en) 1988-01-27 1988-12-30 DISTRIBUTION RADIO SYSTEM WITH NATIONAL ACCESSIBILITY
KR1019890701765A KR930000798B1 (en) 1988-01-27 1988-12-30 Trunked communication system with nation wide roaming capability
JP1501498A JP2757515B2 (en) 1988-01-27 1988-12-30 A relay communication system capable of moving nationwide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/149,245 US4833701A (en) 1988-01-27 1988-01-27 Trunked communication system with nationwide roaming capability
US149,245 1988-01-27

Publications (1)

Publication Number Publication Date
WO1989007380A1 true WO1989007380A1 (en) 1989-08-10

Family

ID=22529396

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1988/004712 WO1989007380A1 (en) 1988-01-27 1988-12-30 Trunked communication system with nationwide roaming capability

Country Status (12)

Country Link
US (1) US4833701A (en)
EP (1) EP0398911B1 (en)
JP (1) JP2757515B2 (en)
KR (1) KR930000798B1 (en)
CN (1) CN1012551B (en)
AT (1) ATE135872T1 (en)
AU (1) AU618068B2 (en)
BR (1) BR8807880A (en)
CA (1) CA1282462C (en)
DE (1) DE3855136T2 (en)
HK (1) HK1000758A1 (en)
WO (1) WO1989007380A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0379642A2 (en) * 1988-09-19 1990-08-01 Gte Telecommunication Services Incorporated System for the extended provision of cellular mobile radiotelephone service
WO1991007065A1 (en) * 1989-10-26 1991-05-16 Motorola Limited Information network
DE4105884A1 (en) * 1990-02-27 1991-08-29 Motorola Inc RADIO TELEPHONE SWITCHING NETWORK
DE4119672A1 (en) * 1991-06-14 1992-12-17 Standard Elektrik Lorenz Ag CONNECTING BETWEEN TERMINALS FOR MOBILE PARTICIPANTS IN A NETWORK
EP0676907A2 (en) * 1994-04-05 1995-10-11 Motorola, Inc. Method and apparatus for call handover between different mobile radio networks
DE4447146A1 (en) * 1994-12-29 1996-07-11 Siemens Ag Data transmission method for mobile communications network
US5610974A (en) * 1994-04-05 1997-03-11 Telefonaktiebolaget Lm Ericsson Method and arrangement for handling a mobile telephone subscriber administered in different mobile telephone networks with a common call number
US5907794A (en) * 1994-03-03 1999-05-25 Nokia Telecommunications Oy Controlling a subscriber station on a direct mode channel
USRE37276E1 (en) 1995-04-05 2001-07-10 Telefonaktiebolaget Lm Ericsson (Publ) Method and arrangement for handling a mobile telephone subscriber administered in different mobile telephone networks with a common call number
WO2003009623A1 (en) * 2001-07-18 2003-01-30 Togewa Holding Ag Method for telecommunication, identification module and computerised service unit

Families Citing this family (233)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5303286A (en) * 1991-03-29 1994-04-12 Space Systems/Loral, Inc. Wireless telephone/satellite roaming system
CA1293042C (en) * 1988-02-04 1991-12-10 Ian Macmillan Communication system supporting remote operations
US5101500A (en) * 1988-05-30 1992-03-31 Kabushiki Kaisha Toshiba Radio telecommunication apparatus
US4916728A (en) * 1988-07-25 1990-04-10 Gte Mobilnet Incorporated Cellular telephone unit with prioritized frequency acquisition
IL91529A0 (en) * 1988-10-28 1990-04-29 Motorola Inc Satellite cellular telephone and data communication system
GB2228162B (en) * 1989-02-08 1993-05-19 Philips Electronic Associated Mobile radio transmission system and a mobile station for use in the system
US5159701A (en) * 1989-03-31 1992-10-27 E. F. Johnson Company Method and apparatus for a distributive wide area network for a land mobile transmission trunked communication system
US5109400A (en) * 1989-04-28 1992-04-28 Motorola, Inc. Communication system with registration and two way radio
AU634234B2 (en) * 1989-05-30 1993-02-18 Motorola, Inc. Method of establishing communication between independent communication systems
US5095529A (en) * 1989-05-30 1992-03-10 Motorola, Inc. Intersystem group call communication system and method
US5860136A (en) * 1989-06-16 1999-01-12 Fenner; Peter R. Method and apparatus for use of associated memory with large key spaces
US5008925A (en) * 1989-12-20 1991-04-16 Motorola, Inc. Cellular telephone responsive to service availability for operating on different cellular telephone systems
US5020093A (en) * 1989-06-23 1991-05-28 Motorola, Inc. Cellular telephone operable on different cellular telephone systems
US5134645A (en) * 1989-06-30 1992-07-28 Berken James J Automatic and sustained association of users with communications paths
US5142694A (en) * 1989-07-24 1992-08-25 Motorola, Inc. Reporting unit
US5090050A (en) * 1989-09-14 1992-02-18 Contel Cellular Inc. Method and apparatus for communicating with radio telephones
US5179374A (en) * 1989-09-29 1993-01-12 Motorola, Inc. Communication network prioritization system for mobile unit
US4972460A (en) * 1989-09-29 1990-11-20 Motorola, Inc. Automatic equivalent temporary talkgroup assignment in a roaming trunking environment
US5093926A (en) * 1989-09-29 1992-03-03 Motorola, Inc. Trunked communication system scanning method and apparatus
SE8903455D0 (en) * 1989-10-19 1989-10-19 Joakim Nelson DYNAMIC DIGITAL CONNECTION UNIT (DFN)
JP3104878B2 (en) * 1990-01-31 2000-10-30 株式会社東芝 Wireless communication device
US5247698A (en) * 1990-02-26 1993-09-21 Telefonaktiebolaget Lm Ericsson Use of an audit message sent to mobile stations to confirm the location thereof
KR100187513B1 (en) * 1990-03-08 1999-05-15 에를링블로메 Dynamic allocation of roamer routing numbers system and method
ES2117638T3 (en) * 1990-04-27 1998-08-16 Ericsson Telefon Ab L M DEVICE AND METHOD FOR DIRECTING CALLS TO MOBILE PHONE SUBSCRIBERS.
US5260987A (en) * 1990-06-18 1993-11-09 Northern Telecom Limited Mobile communications
GB9013605D0 (en) * 1990-06-18 1990-08-08 Stc Plc Mobile communications
GB2245454B (en) * 1990-06-18 1994-03-23 Stc Plc Mobile communications
US5666653A (en) * 1990-08-07 1997-09-09 Inventahl Ab Wide area radio communication system and method for communicating in a wide area through a wide area radio communication system
WO1992002996A1 (en) * 1990-08-07 1992-02-20 Inventahl Ab Modular radio communication system
US5142654A (en) * 1990-08-09 1992-08-25 Appex Corporation Cellular telephone system and method for dynamically switching between call routing options
WO1992003878A1 (en) * 1990-08-17 1992-03-05 Motorola, Inc. Cordless communication system supporting call forwarding
US5392458A (en) * 1990-09-20 1995-02-21 Motorola, Inc. Trunked communication system with variable communication capability support for roamers
US5297191A (en) * 1990-09-28 1994-03-22 At&T Bell Laboratories Method and apparatus for remotely programming a wireless telephone set
US5297192A (en) * 1990-09-28 1994-03-22 At&T Bell Laboratories Method and apparatus for remotely programming a mobile data telephone set
US5159625A (en) * 1990-10-24 1992-10-27 Gte Mobile Communications Service Corp. Method of selecting the cellular system with which a cellular mobile radiotelephone communicates
GB2250892A (en) * 1990-12-14 1992-06-17 Philips Electronic Associated A method of operating a radio communications system
US5734981A (en) * 1991-01-17 1998-03-31 Highwaymaster Communications, Inc. Method and apparatus for call delivery to a mobile unit
US5155689A (en) * 1991-01-17 1992-10-13 By-Word Technologies, Inc. Vehicle locating and communicating method and apparatus
US5610973A (en) * 1991-01-28 1997-03-11 Bellsouth Corporation Interactive roamer contact system for cellular mobile radiotelephone network
US5210787A (en) * 1991-02-05 1993-05-11 Telefonaktiebolaget L M Ericsson Subscriber interrogation point
US5260986A (en) * 1991-04-23 1993-11-09 Bell Atlantic Network Services, Inc. Group notification service and system
US5404392A (en) * 1991-06-12 1995-04-04 International Business Machines Corp. Digital Cellular Overlay Network (DCON)
DE4292232C2 (en) * 1991-07-03 1999-12-09 Motorola Inc Method for establishing a connection between a radio telephone subscriber and a caller within a radio telephone network
US5408683A (en) * 1991-07-18 1995-04-18 Motorola, Inc. Method of anticipating a communication unit's location in a networked radio communications system
CA2078932C (en) * 1991-10-10 2003-12-02 Robert A. Wiedeman Satellite telecommunications system using network coordinating gateways operative with a terrestrial communication system
US5526404A (en) * 1991-10-10 1996-06-11 Space Systems/Loral, Inc. Worldwide satellite telephone system and a network coordinating gateway for allocating satellite and terrestrial gateway resources
US6006107A (en) * 1991-10-16 1999-12-21 Kabushiki Kaisha Toshiba Radio telecommunication apparatus and method having stored system identification numbers
US5307400A (en) * 1991-11-25 1994-04-26 Telefonaktiebolaget L M. Ericsson Call routing in mobile telephone systems
CA2078195C (en) * 1991-11-27 1999-03-09 Jack Kozik Arrangement for detecting fraudulently identified mobile stations in a cellular mobile telecommunications network
US5329573A (en) * 1991-11-27 1994-07-12 At&T Bell Laboratories Arrangement for obtaining authentication key parameters in a cellular mobile telecommunications switching network
US5396543A (en) * 1991-11-27 1995-03-07 At&T Corp. Signaling arrangements in a cellular mobile telecommunications switching system
US5278890A (en) * 1991-11-27 1994-01-11 At&T Bell Laboratories Paging arrangements in a cellular mobile switching system
US6295449B1 (en) 1992-01-27 2001-09-25 @Track Communications, Inc. Data messaging in a communications network using a feature request
US5539810A (en) * 1992-01-27 1996-07-23 Highwaymaster Communications, Inc. Data messaging in a communications network
US5983108A (en) * 1992-01-27 1999-11-09 Highwaymaster Communications, Inc. Method and apparatus for a nation-wide cellular telephone network
US5454027A (en) * 1992-01-27 1995-09-26 Hm Holding Corporation Phantom mobile identification number method and apparatus
US6009330A (en) * 1992-01-27 1999-12-28 Highwaymaster Communications, Inc. Method and apparatus for call delivery to a mobile unit
SE9200283D0 (en) * 1992-02-03 1992-02-03 Peter Aahl DYNAMIC VARIABLE RADIO STATION DVR
CZ209193A3 (en) * 1992-02-06 1994-10-19 Motorola Inc Communication system with portable unit and said communication system mode of operation
US5517618A (en) 1992-02-10 1996-05-14 Matsushita Electric Industrial Co., Ltd. Mobile migration communications control device
SE469865B (en) * 1992-02-17 1993-09-27 Ericsson Telefon Ab L M Ways of establishing cooperation with a functionality and device for practicing the method
US5444765A (en) * 1992-03-23 1995-08-22 Kabushiki Kaisha Toshiba Radio telephone apparatus having a service area confirmation
US5315637A (en) * 1992-05-01 1994-05-24 Motorola, Inc. Apparatus and method for controlling the routing of incoming calls in a wireless communication system
US5533094A (en) * 1992-05-12 1996-07-02 Telefonaktiebolaget L M Ericsson, A Corp. Of Sweden Allocation of paging capacity in cellular applications by storing a set of page request group designations, paging extents and paging priority parameters
US5357561A (en) * 1992-07-10 1994-10-18 Motorola, Inc. Communication unit control for wide area communication systems
US5446553A (en) * 1992-07-15 1995-08-29 Motorola, Inc. Wireless fax reception method with rooming
US5341410A (en) * 1992-07-21 1994-08-23 Ram Mobile Data Usa Limited Partnership Cellular telephone locator using a mobile data system
SE500197C2 (en) * 1992-08-18 1994-05-02 Ericsson Telefon Ab L M Communication network, method of establishing a connection and registration method in such a network
US5625887A (en) * 1992-11-30 1997-04-29 Motorola, Inc. Method for non-registered communication units to access a communication system
US5325419A (en) * 1993-01-04 1994-06-28 Ameritech Corporation Wireless digital personal communications system having voice/data/image two-way calling and intercell hand-off
JPH08506702A (en) * 1993-01-29 1996-07-16 ザ・ボーイング・カンパニー System and method for completing a call
FI92536C (en) * 1993-03-04 1994-11-25 Nokia Telecommunications Oy Procedure in a radio telephone system
US5442806A (en) * 1993-06-08 1995-08-15 Oki Telecom Preferred carrier selection method for selecting any available cellular carrier frequency when neither home nor preferred cellular carrier frequencies are available
JP2541450B2 (en) * 1993-06-15 1996-10-09 日本電気株式会社 Mobile subscriber connection method
US5422935A (en) * 1993-07-13 1995-06-06 Motorola, Inc. Method of and apparatus for providing a local PSTN interconnect with a cellular base site
AU722261B2 (en) * 1993-07-20 2000-07-27 Minorplanet Systems Usa, Inc. Method and apparatus for a nation-wide cellular telephone network
AU697374B2 (en) * 1993-07-20 1998-10-01 Minorplanet Systems Usa, Inc. Method and apparatus for a nation-wide cellular telephone network
FI97599C (en) * 1993-08-20 1997-01-10 Nokia Telecommunications Oy Arrangements and procedure for updating the subscriber position in a group of radio networks
KR960015361B1 (en) * 1993-09-15 1996-11-09 엘지정보통신 주식회사 Width network trunked radio system
US5590405A (en) * 1993-10-29 1996-12-31 Lucent Technologies Inc. Communication technique employing variable information transmission
US5699353A (en) * 1993-11-24 1997-12-16 Ericsson Ge Mobile Communications, Inc. Extended trunked RF communications systems networking
US5481611A (en) * 1993-12-09 1996-01-02 Gte Laboratories Incorporated Method and apparatus for entity authentication
US5553243A (en) * 1994-01-07 1996-09-03 Ericsson Ge Mobile Communications Inc. Method and apparatus for determining with high resolution the fidelity of information received on a communications channel
US5475683A (en) * 1994-01-07 1995-12-12 Ericsson Ge Mobile Communications Inc. Method and apparatus for permitting radio unit roaming between trunked RF transmission sites over a wide area that encompasses plural multisite networks
GB2288301B (en) * 1994-04-05 1998-11-04 Motorola Inc Methods and apparatus for call handover between different mobile radio networks
WO1995031080A1 (en) * 1994-05-06 1995-11-16 Motorola, Inc. A method for establishing a communication link
DE69535140T2 (en) * 1994-06-30 2006-12-07 Casio Computer Co., Ltd. Apparatus for radio communication with multiple identification codes
GB2292046B (en) * 1994-07-26 1999-03-03 Nokia Mobile Phones Ltd Automatic NAM programmer
GB2293294B (en) * 1994-09-02 1999-01-13 Nokia Mobile Phones Ltd Multi-mode radio telephone
US5509053A (en) * 1994-09-14 1996-04-16 Motorola, Inc. Method and apparatus for routing a call to a mobile communication unit in a telepoint communication system
FI97192C (en) * 1994-11-11 1996-10-25 Nokia Telecommunications Oy A method for establishing a group call in a mobile communication system and a mobile communication system
US5649286A (en) * 1994-11-14 1997-07-15 Bellsouth Corporation Method for managing the registration of a wireless unit
US5913170A (en) * 1994-11-16 1999-06-15 Highwaymaster Communications, Inc. Locating system and method using a mobile communications network
FI100499B (en) * 1994-12-28 1997-12-15 Nokia Telecommunications Oy Maintaining a group call in a mobile communication system
US5699275A (en) * 1995-04-12 1997-12-16 Highwaymaster Communications, Inc. System and method for remote patching of operating code located in a mobile unit
US5694322A (en) * 1995-05-09 1997-12-02 Highwaymaster Communications, Inc. Method and apparatus for determining tax of a vehicle
US5778315A (en) * 1995-05-16 1998-07-07 Teletrac, Inc. Integrated mobile unit location services and cellular telephone services
US5717737A (en) * 1995-06-01 1998-02-10 Padcom, Inc. Apparatus and method for transparent wireless communication between a remote device and a host system
US6418324B1 (en) * 1995-06-01 2002-07-09 Padcom, Incorporated Apparatus and method for transparent wireless communication between a remote device and host system
US6044265A (en) * 1995-06-05 2000-03-28 Bellsouth Corporation Methods and apparatus for cellular set programming
EP0749255B1 (en) * 1995-06-12 2003-01-29 Ntt Mobile Communications Network Inc. Mobile communications network and mobile communication method
GB2303763B (en) * 1995-07-26 2000-02-16 Motorola Israel Ltd Communications system and method of operation
US5926760A (en) * 1995-07-31 1999-07-20 Lucent Technologies, Inc. System for providing features for a land-line supported private base station operable in a cellular system
US5920816A (en) * 1995-07-31 1999-07-06 At&T Ipm Corp. Location register for a land-line supported private base station operable in a cellular system
US5724658A (en) * 1995-08-21 1998-03-03 Mci Communications Corporation Call routing to wireless roamers in mobile telecommunication systems
FI100934B (en) * 1995-08-25 1998-03-13 Tecnomen Oy Control of calls in cellular networks
US5797097A (en) * 1995-11-02 1998-08-18 Bellsouth Corporation Method and apparatus for identifying the location of a roaming pager
US5740540A (en) * 1995-11-06 1998-04-14 Mototola, Inc. Method for telephone number notification and storage in a portable radio
US6009326A (en) * 1995-11-14 1999-12-28 Telecordia Technologies, Inc. Anchor radio system based handover
US5963863A (en) * 1995-12-01 1999-10-05 Telefonaktiebolaget L M Ericsson Routing system for automatically routing a call to a multi-mode transceiver in a wireless network
US5999811A (en) * 1996-02-16 1999-12-07 Ericsson, Inc. Mobile telephone for roaming using dual mode/band equipment including SIM cards
US5960340A (en) * 1996-02-28 1999-09-28 At&T Corporation Automatic cellular telephone registration for universal telephone number service
US5839065A (en) * 1996-04-23 1998-11-17 Ericsson Inc. Validation of a forward-to-number by a mobile station
US5881368A (en) * 1996-06-06 1999-03-09 Qualcomm Incorporated Method and apparatus of power control in a CDMA dispatch system
US5884196A (en) * 1996-06-06 1999-03-16 Qualcomm Incorporated Method and apparatus of preserving power of a remote unit in a dispatch system
US5844885A (en) * 1996-06-11 1998-12-01 Qualcomm Incorporated Method and apparatus of providing bit count integrity and synchronous data transfer over a channel which does not preserve synchronization
US5983099A (en) * 1996-06-11 1999-11-09 Qualcomm Incorporated Method/apparatus for an accelerated response to resource allocation requests in a CDMA push-to-talk system using a CDMA interconnect subsystem to route calls
US5966653A (en) * 1996-06-24 1999-10-12 Ericsson Inc. Validating a forward-to-number within a mobile telecommunications system
US5983114A (en) * 1996-06-26 1999-11-09 Qualcomm Incorporated Method and apparatus for monitoring link activity to prevent system deadlock in a dispatch system
JPH1023509A (en) * 1996-07-03 1998-01-23 Toshiba Corp Mobile communication system, and its radio controller and terminal device
US5832382A (en) * 1996-09-16 1998-11-03 Ericsson Inc. Optimized routing of mobile calls within a telecommunications network
US5884179A (en) * 1996-09-16 1999-03-16 Ericsson Inc. Optimized routing of terminating calls within a mobile telecommunications network
GB2320161B (en) * 1996-12-04 2001-02-14 Motorola Israel Ltd A communication method
US6073016A (en) * 1997-01-02 2000-06-06 Telxon Corporation Mobile device ID allocation system and method
US5974328A (en) * 1997-01-13 1999-10-26 Airtouch Communications, Inc. Rapid system access and registration in mobile phone systems
US5875180A (en) * 1997-02-06 1999-02-23 Globalstar L.P. Satellite telephone interference avoidance system
US5974331A (en) 1997-04-04 1999-10-26 U S West, Inc. Method and system for dynamically assigning features and users to wireline interfaces
US6529486B1 (en) 1997-04-11 2003-03-04 Transcrypt International/E.F. Johnson Company Trunked radio repeater communication system
US6684080B1 (en) 1997-05-28 2004-01-27 Transcrypt International/E. F. Johnson Company Trunked radio repeater communication system including home channel aliasing and call grouping
US6374115B1 (en) 1997-05-28 2002-04-16 Transcrypt International/E.F. Johnson Method and apparatus for trunked radio repeater communications with backwards compatibility
US6560461B1 (en) 1997-08-04 2003-05-06 Mundi Fomukong Authorized location reporting paging system
US6192241B1 (en) * 1997-09-10 2001-02-20 Verizon Laboratories Inc. Worldwide wireless subscriber access service
US6141531A (en) * 1997-11-26 2000-10-31 Direct Wireless Corporation Local wireless communication system with external communications link
US6157630A (en) * 1998-01-26 2000-12-05 Motorola, Inc. Communications system with radio device and server
US6374078B1 (en) 1998-04-17 2002-04-16 Direct Wireless Corporation Wireless communication system with multiple external communication links
US6360100B1 (en) * 1998-09-22 2002-03-19 Qualcomm Incorporated Method for robust handoff in wireless communication system
US7136645B2 (en) 1998-10-09 2006-11-14 Netmotion Wireless, Inc. Method and apparatus for providing mobile and other intermittent connectivity in a computing environment
US8078727B2 (en) 1998-10-09 2011-12-13 Netmotion Wireless, Inc. Method and apparatus for providing mobile and other intermittent connectivity in a computing environment
US7778260B2 (en) 1998-10-09 2010-08-17 Netmotion Wireless, Inc. Method and apparatus for providing mobile and other intermittent connectivity in a computing environment
US7293107B1 (en) 1998-10-09 2007-11-06 Netmotion Wireless, Inc. Method and apparatus for providing mobile and other intermittent connectivity in a computing environment
US8060656B2 (en) * 1998-10-09 2011-11-15 Netmotion Wireless, Inc. Method and apparatus for providing mobile and other intermittent connectivity in a computing environment
USRE43856E1 (en) 1999-06-08 2012-12-11 Tasom Mobile Transfer Co. Llc Hybrid public/private wireless network with seamless roaming
US6868272B1 (en) 1999-06-08 2005-03-15 Utstarcom, Inc. Method and apparatus for roaming in hierarchical mobile communications network
US7882247B2 (en) * 1999-06-11 2011-02-01 Netmotion Wireless, Inc. Method and apparatus for providing secure connectivity in mobile and other intermittent computing environments
US7783508B2 (en) 1999-09-20 2010-08-24 Numerex Corp. Method and system for refining vending operations based on wireless data
US6718177B1 (en) 1999-09-20 2004-04-06 Cellemetry, Llc System for communicating messages via a forward overhead control channel for a programmable logic control device
US6856808B1 (en) 1999-10-29 2005-02-15 Cellmetry, Llc Interconnect system and method for multiple protocol short message services
US6405042B1 (en) * 2000-02-03 2002-06-11 Lucent Technologies Inc. Provision of cellular/wire-line service
DE10012756B4 (en) * 2000-03-16 2017-11-02 Volkswagen Ag Method and device for storing and retrieving individual settings
US7245928B2 (en) 2000-10-27 2007-07-17 Cellemetry, Llc Method and system for improved short message services
US6771962B2 (en) * 2001-03-30 2004-08-03 Nokia Corporation Apparatus, and an associated method, by which to provide temporary identifiers to a mobile node involved in a communication handover
US7339903B2 (en) * 2001-06-14 2008-03-04 Qualcomm Incorporated Enabling foreign network multicasting for a roaming mobile node, in a foreign network, using a persistent address
US7474650B2 (en) * 2001-06-26 2009-01-06 Qualcomm Incorporated Methods and apparatus for controlling resource allocation where tunneling and access link packet aggregation are used in combination
US7027400B2 (en) * 2001-06-26 2006-04-11 Flarion Technologies, Inc. Messages and control methods for controlling resource allocation and flow admission control in a mobile communications system
US8000241B2 (en) * 2001-06-26 2011-08-16 Qualcomm Incorporated Methods and apparatus for controlling access link packet flow aggregation and resource allocation in a mobile communications system
WO2003003756A2 (en) * 2001-06-27 2003-01-09 Flarion Technologies, Inc. Methods and apparatus for supporting group communications
US7644171B2 (en) * 2001-09-12 2010-01-05 Netmotion Wireless, Inc. Mobile networking system and method using IPv4 and IPv6
US6907242B2 (en) * 2001-10-02 2005-06-14 Ericsson Inc. Local subscriber number and services for non-local wireless subscribers
US7457267B1 (en) * 2001-10-10 2008-11-25 Qualcomm Incorporated Methods and apparatus for quickly exploiting a new link during hand-off in a wireless network
AU2003217301A1 (en) * 2002-02-04 2003-09-02 Flarion Technologies, Inc. A method for extending mobile ip and aaa to enable integrated support for local access and roaming access connectivity
US20030193952A1 (en) * 2002-02-04 2003-10-16 O'neill Alan Mobile node handoff methods and apparatus
US7564824B2 (en) * 2002-02-04 2009-07-21 Qualcomm Incorporated Methods and apparatus for aggregating MIP and AAA messages
US8649352B2 (en) * 2002-02-04 2014-02-11 Qualcomm Incorporated Packet forwarding methods for use in handoffs
US6718237B1 (en) 2002-03-28 2004-04-06 Numerex Investment Corp. Method for reducing capacity demands for conveying geographic location information over capacity constrained wireless systems
US7356020B2 (en) * 2002-04-08 2008-04-08 Qualcomm Incorporated Support of disparate addressing plans and dynamic HA address allocation in mobile IP
WO2004006592A1 (en) * 2002-07-08 2004-01-15 Huawei Technologies Co., Ltd Network and method of realizing local roaming for subscribers
US7363039B2 (en) * 2002-08-08 2008-04-22 Qualcomm Incorporated Method of creating and utilizing diversity in multiple carrier communication system
US6961595B2 (en) * 2002-08-08 2005-11-01 Flarion Technologies, Inc. Methods and apparatus for operating mobile nodes in multiple states
US8190163B2 (en) * 2002-08-08 2012-05-29 Qualcomm Incorporated Methods and apparatus of enhanced coding in multi-user communication systems
US6788963B2 (en) 2002-08-08 2004-09-07 Flarion Technologies, Inc. Methods and apparatus for operating mobile nodes in multiple a states
US6993333B2 (en) * 2003-10-16 2006-01-31 Flarion Technologies, Inc. Methods and apparatus of improving inter-sector and/or inter-cell handoffs in a multi-carrier wireless communications system
US7869803B2 (en) * 2002-10-15 2011-01-11 Qualcomm Incorporated Profile modification for roaming in a communications environment
US7882346B2 (en) 2002-10-15 2011-02-01 Qualcomm Incorporated Method and apparatus for providing authentication, authorization and accounting to roaming nodes
US7668541B2 (en) 2003-01-31 2010-02-23 Qualcomm Incorporated Enhanced techniques for using core based nodes for state transfer
US6862446B2 (en) * 2003-01-31 2005-03-01 Flarion Technologies, Inc. Methods and apparatus for the utilization of core based nodes for state transfer
AU2004213988B2 (en) * 2003-02-19 2009-09-10 Qualcomm Incorporated Methods and apparatus of enhanced coding in multi-user communications systems
US7218948B2 (en) 2003-02-24 2007-05-15 Qualcomm Incorporated Method of transmitting pilot tones in a multi-sector cell, including null pilot tones, for generating channel quality indicators
US9544860B2 (en) 2003-02-24 2017-01-10 Qualcomm Incorporated Pilot signals for use in multi-sector cells
US9661519B2 (en) 2003-02-24 2017-05-23 Qualcomm Incorporated Efficient reporting of information in a wireless communication system
US8811348B2 (en) 2003-02-24 2014-08-19 Qualcomm Incorporated Methods and apparatus for generating, communicating, and/or using information relating to self-noise
US8593932B2 (en) * 2003-05-16 2013-11-26 Qualcomm Incorporated Efficient signal transmission methods and apparatus using a shared transmission resource
US7925291B2 (en) * 2003-08-13 2011-04-12 Qualcomm Incorporated User specific downlink power control channel Q-bit
US7212821B2 (en) * 2003-12-05 2007-05-01 Qualcomm Incorporated Methods and apparatus for performing handoffs in a multi-carrier wireless communications system
US7047009B2 (en) * 2003-12-05 2006-05-16 Flarion Technologies, Inc. Base station based methods and apparatus for supporting break before make handoffs in a multi-carrier system
CN1555005A (en) * 2003-12-29 2004-12-15 ����ͨѶ�ɷ����޹�˾ Crossover type command submitting method of dynamic circulation streamline
US7323970B1 (en) 2004-01-21 2008-01-29 Numerex Corporation Method and system for remote interaction with a vehicle via wireless communication
US7697501B2 (en) * 2004-02-06 2010-04-13 Qualcomm Incorporated Methods and apparatus for separating home agent functionality
JP4309304B2 (en) * 2004-04-23 2009-08-05 株式会社東芝 Semiconductor memory device and control method thereof
CA2572637C (en) * 2004-07-06 2011-09-27 Zte Corporation Digital trunked communication network which supports roaming and method thereof
US20060092881A1 (en) * 2004-10-14 2006-05-04 Rajiv Laroia Methods and apparatus for determining, communicating and using information which can be used for interference control purposes
JP2008517539A (en) * 2004-10-14 2008-05-22 クゥアルコム・フラリオン・テクノロジーズ、インコーポレイテッド Method and apparatus for determining, communicating and using information that can be used for interference control
US8503938B2 (en) * 2004-10-14 2013-08-06 Qualcomm Incorporated Methods and apparatus for determining, communicating and using information including loading factors which can be used for interference control purposes
US8346214B2 (en) * 2005-04-29 2013-01-01 Jasper Wireless, Inc. Self provisioning of wireless terminals in wireless networks
US7117075B1 (en) * 2005-08-15 2006-10-03 Report On Board Llc Driver activity and vehicle operation logging and reporting
US20070038353A1 (en) * 2005-08-15 2007-02-15 Larschan Bradley R Driver activity and vehicle operation logging and reporting
US8626377B2 (en) 2005-08-15 2014-01-07 Innovative Global Systems, Llc Method for data communication between a vehicle and fuel pump
US20070038338A1 (en) * 2005-08-15 2007-02-15 Larschan Bradley R Driver activity and vehicle operation logging and reporting
US20070038351A1 (en) * 2005-08-15 2007-02-15 Larschan Bradley R Driver activity and vehicle operation logging and reporting
US8983468B2 (en) 2005-12-22 2015-03-17 Qualcomm Incorporated Communications methods and apparatus using physical attachment point identifiers
US9066344B2 (en) 2005-09-19 2015-06-23 Qualcomm Incorporated State synchronization of access routers
US9078084B2 (en) 2005-12-22 2015-07-07 Qualcomm Incorporated Method and apparatus for end node assisted neighbor discovery
US8982835B2 (en) * 2005-09-19 2015-03-17 Qualcomm Incorporated Provision of a move indication to a resource requester
US9736752B2 (en) 2005-12-22 2017-08-15 Qualcomm Incorporated Communications methods and apparatus using physical attachment point identifiers which support dual communications links
US8982778B2 (en) 2005-09-19 2015-03-17 Qualcomm Incorporated Packet routing in a wireless communications environment
US8509799B2 (en) 2005-09-19 2013-08-13 Qualcomm Incorporated Provision of QoS treatment based upon multiple requests
US8989084B2 (en) 2005-10-14 2015-03-24 Qualcomm Incorporated Methods and apparatus for broadcasting loading information corresponding to neighboring base stations
US9191840B2 (en) 2005-10-14 2015-11-17 Qualcomm Incorporated Methods and apparatus for determining, communicating and using information which can be used for interference control
US8514771B2 (en) 2005-12-22 2013-08-20 Qualcomm Incorporated Methods and apparatus for communicating and/or using transmission power information
US9148795B2 (en) 2005-12-22 2015-09-29 Qualcomm Incorporated Methods and apparatus for flexible reporting of control information
US9338767B2 (en) * 2005-12-22 2016-05-10 Qualcomm Incorporated Methods and apparatus of implementing and/or using a dedicated control channel
US9119220B2 (en) 2005-12-22 2015-08-25 Qualcomm Incorporated Methods and apparatus for communicating backlog related information
US20070249287A1 (en) * 2005-12-22 2007-10-25 Arnab Das Methods and apparatus for selecting between a plurality of dictionaries
US8437251B2 (en) 2005-12-22 2013-05-07 Qualcomm Incorporated Methods and apparatus for communicating transmission backlog information
US9125092B2 (en) 2005-12-22 2015-09-01 Qualcomm Incorporated Methods and apparatus for reporting and/or using control information
US20070149132A1 (en) 2005-12-22 2007-06-28 Junyl Li Methods and apparatus related to selecting control channel reporting formats
US9125093B2 (en) 2005-12-22 2015-09-01 Qualcomm Incorporated Methods and apparatus related to custom control channel reporting formats
US9572179B2 (en) 2005-12-22 2017-02-14 Qualcomm Incorporated Methods and apparatus for communicating transmission backlog information
US9137072B2 (en) 2005-12-22 2015-09-15 Qualcomm Incorporated Methods and apparatus for communicating control information
US9451491B2 (en) 2005-12-22 2016-09-20 Qualcomm Incorporated Methods and apparatus relating to generating and transmitting initial and additional control information report sets in a wireless system
US9473265B2 (en) * 2005-12-22 2016-10-18 Qualcomm Incorporated Methods and apparatus for communicating information utilizing a plurality of dictionaries
US9083355B2 (en) 2006-02-24 2015-07-14 Qualcomm Incorporated Method and apparatus for end node assisted neighbor discovery
US20070243882A1 (en) 2006-04-12 2007-10-18 Qualcomm Incorporated Method and apparatus for locating a wireless local area network associated with a wireless wide area network
WO2007136723A2 (en) 2006-05-17 2007-11-29 Numerex Corp. System and method for prolonging wireless data product's life
RU2438256C2 (en) 2007-01-11 2011-12-27 Квэлкомм Инкорпорейтед Using dtx and drx in wireless communication system
US8265605B2 (en) 2007-02-06 2012-09-11 Numerex Corp. Service escrowed transportable wireless event reporting system
US9155008B2 (en) 2007-03-26 2015-10-06 Qualcomm Incorporated Apparatus and method of performing a handoff in a communication network
US8830818B2 (en) 2007-06-07 2014-09-09 Qualcomm Incorporated Forward handover under radio link failure
US9094173B2 (en) 2007-06-25 2015-07-28 Qualcomm Incorporated Recovery from handoff error due to false detection of handoff completion signal at access terminal
US8599767B2 (en) * 2008-06-26 2013-12-03 Netgear, Inc. Method and apparatus for scanning multi-mode wireless communication environments
US8706131B2 (en) * 2009-06-18 2014-04-22 Empire Technology Development Llc Device location prediction for mobile service optimization
US8615241B2 (en) 2010-04-09 2013-12-24 Qualcomm Incorporated Methods and apparatus for facilitating robust forward handover in long term evolution (LTE) communication systems
BE1025292B1 (en) 2017-06-06 2019-01-15 Layerwise N.V. APPARATUS FOR ADDITIVELY MANUFACTURING A PRODUCT WITH A CALIBRATION DEVICE AND METHOD FOR CALIBRATING SUCH A DEVICE
CN113747417B (en) * 2020-05-28 2024-10-15 海能达通信股份有限公司 Method for terminal roaming call, terminal and transfer equipment

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54114016A (en) * 1978-02-24 1979-09-05 Nippon Telegr & Teleph Corp <Ntt> Trace telephone system
JPS58191540A (en) * 1982-04-30 1983-11-08 Nec Corp Cordless subscriber telephone set
EP0111972A2 (en) * 1982-12-17 1984-06-27 Philips Kommunikations Industrie AG Method and controlling device for the selection of an organization channel in a mobile radio station of a radio transmission system
JPS60103834A (en) * 1983-11-11 1985-06-08 Nippo Tsushin Kogyo Kk Individual call communication system
GB2162404A (en) * 1984-07-25 1986-01-29 Racal Res Ltd Portable radio telephones
US4573206A (en) * 1982-12-17 1986-02-25 U.S. Philips Corporation Method and means for allocating the volume of traffic over different control channels of a cellular radio system
US4578815A (en) * 1983-12-07 1986-03-25 Motorola, Inc. Wide area coverage radio communication system and method
JPS61186056A (en) * 1985-02-13 1986-08-19 Nec Corp Pocket bell paging system through private line network
US4646345A (en) * 1986-06-09 1987-02-24 Motorola, Inc. Automatic unit ID for quasi-transmission trunked systems
US4658416A (en) * 1984-02-14 1987-04-14 Nec Corporation Automatic call transfer system capable of carrying out call transfer without manual operation
US4723264A (en) * 1987-06-19 1988-02-02 Motorola, Inc. Signalling method for establishing trunked communication
US4737977A (en) * 1985-12-09 1988-04-12 Balduin Norman Device and method for switching communications among taxis
US4737978A (en) * 1986-10-31 1988-04-12 Motorola, Inc. Networked cellular radiotelephone systems

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898390A (en) * 1973-05-15 1975-08-05 Martin Marietta Corp Multiple zone communications system and method
US4012597A (en) * 1975-11-24 1977-03-15 Motorola, Inc. Transmission trunk multichannel dispatch system with priority queuing
US4178476A (en) * 1978-05-26 1979-12-11 Frost Edward G Automatic nationwide paging system
US4233473A (en) * 1978-08-31 1980-11-11 Frost Edward G Comprehensive automatic mobile radio telephone system
US4651156A (en) * 1982-02-08 1987-03-17 Mcgraw-Edison Co. Integrated radio location and communication system
US4562572A (en) * 1983-01-11 1985-12-31 International Telephone And Telegraph Corporation Cellular mobile radio service telephone system
IT1209566B (en) * 1984-07-06 1989-08-30 Face Standard Ind SYSTEM AND PROCEDURE TO IDENTIFY THE POSITION OF A RADIO USER WITHIN A WIDE GEOGRAPHICAL SURFACE.
US4612415A (en) * 1984-08-03 1986-09-16 Motorola, Inc. Dynamic control of telephone traffic in a trunked radio system
US4672601A (en) * 1984-12-06 1987-06-09 Motorola, Inc. Duplex interconnect/dispatch trunked radio system
US4670899A (en) * 1985-05-31 1987-06-02 Northern Telecom Limited Load balancing for cellular radiotelephone system
JPH0652956B2 (en) * 1985-09-13 1994-07-06 日本電信電話株式会社 Mobile wireless communication system
US4670090A (en) * 1986-01-23 1987-06-02 Rockwell International Corporation Method for producing a field effect transistor
JPS62293832A (en) * 1986-06-13 1987-12-21 Iwatsu Electric Co Ltd Cordless telephone system
JP2523297B2 (en) * 1987-01-14 1996-08-07 日本電信電話株式会社 Mobile wireless communication system
JPH0752982B2 (en) * 1987-01-14 1995-06-05 日本電信電話株式会社 Mobile wireless phone method
JPS63285027A (en) * 1987-05-18 1988-11-22 Nec Corp Wide area cordless telephone system
KR100298880B1 (en) * 1997-05-01 2001-10-26 송기선 Optical coupling device and method for manufacturing the same

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54114016A (en) * 1978-02-24 1979-09-05 Nippon Telegr & Teleph Corp <Ntt> Trace telephone system
JPS58191540A (en) * 1982-04-30 1983-11-08 Nec Corp Cordless subscriber telephone set
US4573206A (en) * 1982-12-17 1986-02-25 U.S. Philips Corporation Method and means for allocating the volume of traffic over different control channels of a cellular radio system
EP0111972A2 (en) * 1982-12-17 1984-06-27 Philips Kommunikations Industrie AG Method and controlling device for the selection of an organization channel in a mobile radio station of a radio transmission system
JPS60103834A (en) * 1983-11-11 1985-06-08 Nippo Tsushin Kogyo Kk Individual call communication system
US4578815A (en) * 1983-12-07 1986-03-25 Motorola, Inc. Wide area coverage radio communication system and method
US4658416A (en) * 1984-02-14 1987-04-14 Nec Corporation Automatic call transfer system capable of carrying out call transfer without manual operation
GB2162404A (en) * 1984-07-25 1986-01-29 Racal Res Ltd Portable radio telephones
JPS61186056A (en) * 1985-02-13 1986-08-19 Nec Corp Pocket bell paging system through private line network
US4737977A (en) * 1985-12-09 1988-04-12 Balduin Norman Device and method for switching communications among taxis
US4646345A (en) * 1986-06-09 1987-02-24 Motorola, Inc. Automatic unit ID for quasi-transmission trunked systems
US4737978A (en) * 1986-10-31 1988-04-12 Motorola, Inc. Networked cellular radiotelephone systems
US4723264A (en) * 1987-06-19 1988-02-02 Motorola, Inc. Signalling method for establishing trunked communication

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0379642A3 (en) * 1988-09-19 1992-01-22 Gte Telecommunication Services Incorporated System for the extended provision of cellular mobile radiotelephone service
EP0379642A2 (en) * 1988-09-19 1990-08-01 Gte Telecommunication Services Incorporated System for the extended provision of cellular mobile radiotelephone service
WO1991007065A1 (en) * 1989-10-26 1991-05-16 Motorola Limited Information network
JPH04503743A (en) * 1989-10-26 1992-07-02 モトローラ・リミテッド information network
DE4105884A1 (en) * 1990-02-27 1991-08-29 Motorola Inc RADIO TELEPHONE SWITCHING NETWORK
DE4119672A1 (en) * 1991-06-14 1992-12-17 Standard Elektrik Lorenz Ag CONNECTING BETWEEN TERMINALS FOR MOBILE PARTICIPANTS IN A NETWORK
US5907794A (en) * 1994-03-03 1999-05-25 Nokia Telecommunications Oy Controlling a subscriber station on a direct mode channel
EP0676907A2 (en) * 1994-04-05 1995-10-11 Motorola, Inc. Method and apparatus for call handover between different mobile radio networks
US5610974A (en) * 1994-04-05 1997-03-11 Telefonaktiebolaget Lm Ericsson Method and arrangement for handling a mobile telephone subscriber administered in different mobile telephone networks with a common call number
EP0676907A3 (en) * 1994-04-05 1995-12-20 Motorola Inc Method and apparatus for call handover between different mobile radio networks.
DE4447146A1 (en) * 1994-12-29 1996-07-11 Siemens Ag Data transmission method for mobile communications network
USRE37276E1 (en) 1995-04-05 2001-07-10 Telefonaktiebolaget Lm Ericsson (Publ) Method and arrangement for handling a mobile telephone subscriber administered in different mobile telephone networks with a common call number
WO2003009623A1 (en) * 2001-07-18 2003-01-30 Togewa Holding Ag Method for telecommunication, identification module and computerised service unit
AU2001268892B2 (en) * 2001-07-18 2006-12-21 Togewa Holding Ag Method for telecommunication, identification module and computerised service unit
US7706791B2 (en) 2001-07-18 2010-04-27 Togewa Holding Ag Method for telecommunication, identification module and computerized service unit

Also Published As

Publication number Publication date
CA1282462C (en) 1991-04-02
JP2757515B2 (en) 1998-05-25
HK1000758A1 (en) 1998-04-24
US4833701A (en) 1989-05-23
EP0398911A1 (en) 1990-11-28
DE3855136T2 (en) 1996-10-02
CN1012551B (en) 1991-05-01
ATE135872T1 (en) 1996-04-15
KR900701140A (en) 1990-08-17
AU618068B2 (en) 1991-12-12
CN1039163A (en) 1990-01-24
EP0398911A4 (en) 1992-04-15
AU2933589A (en) 1989-08-25
EP0398911B1 (en) 1996-03-20
DE3855136D1 (en) 1996-04-25
KR930000798B1 (en) 1993-02-04
JPH03503346A (en) 1991-07-25
BR8807880A (en) 1990-09-25

Similar Documents

Publication Publication Date Title
US4833701A (en) Trunked communication system with nationwide roaming capability
AU649662B2 (en) Dynamic allocation of roamer routing numbers system and method
US5835860A (en) Operation and administration of mobile station user groups in wireless communications systems
CA2078439C (en) Apparatus and method for directing calls to mobile telephone subscribers
US5711011A (en) Method for providing voice mail service in a dispatch radio communication system and corresponding dispatch system
KR100196889B1 (en) System for location of communication end users
US5369781A (en) Dispatch communication system with adjacent system signal repeating
EP0285165A2 (en) Wide area cordless telephone system having means for avoiding double registrations
EP0888025A2 (en) Method and apparatus for providing partitioned telecommunication service
WO1992008325A1 (en) Call hand-off with user selectable site switching
EP0696153B1 (en) Communication method commonly using mobile communication terminal and communication system controller used therefor
US5649298A (en) Method and apparatus of inter-operability between conventional and trunked communications system
CN1227876C (en) Roaming method and device of hierarchical mobile communiating network
RU2121227C1 (en) Process of data reception in standard gsm network concerning additional services in system msc and vlr
WO1994003993A1 (en) Wireless pbx system using frequency scanner for channel identification
KR970002706B1 (en) Network management code control method in the mobile communication network
KR100242702B1 (en) Method for disposing of call hold and conference calling
KR19990031952A (en) How to Prevent Switch Occupancy on Wireless Channel Allocation Failure Calls
EP1287719B1 (en) Support of group traffic in telecommunication network
JPS63260327A (en) Mobile communication system

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU BR JP KR

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LU NL SE

WWE Wipo information: entry into national phase

Ref document number: 1989901513

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1989901513

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1989901513

Country of ref document: EP