EP0474675A1 - Procede pour etablir une liaison entre des systemes de transmission independants - Google Patents

Procede pour etablir une liaison entre des systemes de transmission independants

Info

Publication number
EP0474675A1
EP0474675A1 EP90908038A EP90908038A EP0474675A1 EP 0474675 A1 EP0474675 A1 EP 0474675A1 EP 90908038 A EP90908038 A EP 90908038A EP 90908038 A EP90908038 A EP 90908038A EP 0474675 A1 EP0474675 A1 EP 0474675A1
Authority
EP
European Patent Office
Prior art keywords
communication
resources
communication system
resource
units
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90908038A
Other languages
German (de)
English (en)
Other versions
EP0474675A4 (en
Inventor
Michael David Sasuta
Gary Dean Erickson
Richard Alan Comroe
Arun Sobti
John Edward Major
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
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
Priority claimed from US07/358,906 external-priority patent/US5159695A/en
Priority claimed from US07/358,747 external-priority patent/US5095529A/en
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of EP0474675A1 publication Critical patent/EP0474675A1/fr
Publication of EP0474675A4 publication Critical patent/EP0474675A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/08—Trunked mobile radio systems

Definitions

  • This invention relates generally to communication systems, and more particularly to interlinked trunked communication systems.
  • Trunked communication systems are known in the art.
  • such systems include a resource controller (which may be centrally located or distributed) that manages communications between communication units (such as fixed location, mobile, and portable two-way radios) on a plurality of communication resources (such as frequency pairs or TDM time slots) that are supported by a plurality of corresponding repeaters.
  • a resource controller which may be centrally located or distributed
  • communicate units such as fixed location, mobile, and portable two-way radios
  • communication resources such as frequency pairs or TDM time slots
  • a number of such systems are available, including the Smartnet and Privacy Plus systems from Motorola, the Clearchannel LTR system from E.F. Johnson, and the Sixteen Plus and Sweet Sixteen systems from General Electric. In general, such systems tend to operate independent of one another. Therefore, a communication unit located in a first system will generally not be able to communicate with a second communication unit located in a second communication system.
  • Some prior art systems interlink one or more communication systems through use of an appropriate dedicated landline. So configured, communication units in different communication systems may be able to communicate with one another. Such an approach, however, poses several disadvantages, including increased cost and relative inflexibility. In addition, even when so linked, such solutions do not readily accommodate group calls.
  • This need is substantially met through provision of the intersystem communication system disclosed herein.
  • This system functions in conjunction with at least two communication systems that each include a set of communication resources and resource controllers for controlling allocation of these resources.
  • one or more of these communication systems are also provided with one or more supplemental receivers that are at least substantially compatible with the communication resources that are ordinarily used in the opposing system. So configured, communication requests sourced from a first system can be received by the a second system having such a supplemental receiver tuned to the appropriate resources of the first system, and thereafter be properly processed.
  • each communication system is provided with a receiver that is compatible with the control communication resource, such as a dedicated control channel, of an opposing system. So configured, communications sourced from one system can be received by the other system and properly processed.
  • a receiver can be provided to accommodate each communication resource supported by the other communication system. This embodiment offers a high degree of flexibility in communication resource allocation.
  • control communication resource supports both primary control signalling used by member communication units of the communications system to facilitate allocation of the communication resources amongst the member communication units.
  • this control communication resource also supports secondary control signalling that is intended for and used by a second communication system to facilitate system to system communications.
  • the primary control signalling and the secondary control signalling can be transmitted at different data rates, wherein the secondary control signalling is transmitted at a higher data rate.
  • communication units that belong to a common fleet or group share, at least in part, a common group ID in each system. For example, a first ID is used while communicating within the home system. The home system recognizes this ID as representing a local group or fleet.
  • a second ID can also be used by the radios that comprise the group or fleet when in a second system. This second ID is preregistered in the second system as a roaming ID, along with information regarding the home system that corresponds to that particular ID. In a similar manner, additional IDs can be used with different systems for which the radios are preregistered as roamers.
  • the non-home system When such a non-home system determines that a preregistered roamer has entered its system, the non-home system will use its supplemental receiver to monitor the communication resources of the home system for that roamer. Communications from the home system that are intended for the roamer can then be intercepted and forwarded on to the roamer through use of the non-home system resources.
  • Fig. 1 comprises a block diagram depiction of a first embodiment of the invention
  • Fig. 2 comprises a timing diagram of the control communication resource in accordance with the first embodiment
  • Fig. 3 comprises a block diagram depiction of a second embodiment of the invention.
  • Fig. 4 comprises a block diagram depiction of a third embodiment of the invention. Best Mode For Carrying Out The Invention
  • a first embodiment can be seen as depicted generally by the numeral 100.
  • the system (100) operates in conjunction with other communication systems.
  • only two such communication systems (101 and 102) will be described.
  • the first communication system (101) includes a resource controller (103) that functions to control allocation of a first set of communication resources.
  • the communication resources are supported by a plurality of repeaters (104), and that the communication resources themselves comprise a first set of three frequency pairs A- C.
  • one of the repeaters (104) supports system control information related to resource allocation requests and grants.
  • Such system control information intended for member communication units (106) of that system (101 ) is referred to herein as primary signalling information.
  • the resource controller (103) controls the repeaters (104) and interchanges resource allocation request and grant information as primary control signalling through the repeaters (104) via an appropriate link (107) as well understood in the art.
  • a second communication system (102) similarly includes a resource controller (108), repeaters (109) (that support communication resources D-F), and an appropriate link (111 ) therebetween.
  • the communication resources A-C of the first system (101) are different from the communication resources D-F of the second system (102). Therefore, the two systems (101 and 102) are not able to communicate directly with one another through the repeaters provided.
  • each system (101 and 102) is also provided with a receiver (112 and 113) that is capable of compatibly receiving at least one communication resource of the other system.
  • the communication resource so received is the control communication resource.
  • Received signalling information is then coupled from the receiver (112 and 113) to the associated resource controller (103 and 108, respectively) via an appropriate link (114 and 115, respectively).
  • the resource controller (103 and 108) are capable of monitoring the control communication resource of the other system.
  • the outbound primary control signalling uses a slotted Aloha channel access protocol.
  • outbound primary control signalling words (PCS) (201) are sourced by the resource controller and transmitted by the appropriate control communication resource repeater. These PCS (201) data transmissions are interleaved with appropriate synchronization words (202).
  • a system ID (203) is occasionally transmitted, all as well understood in the art.
  • the next available data slot (204) following the system ID (203) supports an outbound secondary control signal (SCS) intended for the adjacent communication system.
  • SCS outbound secondary control signal
  • the secondary control signalling word (204) can utilize a higher bit rate, thereby increasing the data rate by perhaps a factor of 10.
  • the outbound secondary control signal word could hold from 760 to 840 bits of data presuming a transmission rate of about 36 K BPS.
  • capacity of the control communication resource will not be substantially impaired.
  • the high bit rate will provide satisfactory performance because only fixed site to fixed site communications need be supported.
  • a resource controller can source an appropriate secondary control signal intended for reception and processing by another communication system.
  • Such information could be, for example, to establish intersystem communications between communication units (106) as described below in more detail.
  • the first communication system (301 ) again includes a resource controller (303) that functions to control allocation of a first set of communication resources.
  • the resource controller (303) controls the repeaters (304) and interchanges resource allocation request and grant information through the repeaters (304), via an appropriate link (306).
  • the second communication system (302) similarly includes a resource controller (307), repeaters (308) (which support communication resources D-F) and an appropriate link (309) therebetween.
  • the communication resources A-C of the first system (301 ) are different from the communication resources D-F of the second system (302). Therefore, the two systems (301 and 302) are not able to communicate directly with one another through the repeaters provided.
  • the first communication system (301 ) also includes a plurality of receivers (311 ) that are capable of compatibly receiving the communication resources D-F of the second communication system (302).
  • a receiver (311) be provided to accommodate each communication resource of the opposite system, in this embodiment such a receiver (311) has been so provided.
  • An appropriate communication link (312) is provided between the receivers (311 ) and the resource controller (303) to allow operation of the receivers (311 ) to be controlled, at least in part, by the resource controller (303), and also to allow the resource controller (303) to receive signalling information as received by the receivers (311) and as sourced from the resource controller (307) of the second system (302).
  • an appropriate link (313) is provided between the receivers (311 ) and the repeaters (304) of the first system (301 ).
  • This link (313) is appropriately gated (314) to allow the resource controller (303) to control provision of signals received by the receivers (311 ) to the repeaters (304).
  • the resource controller (303) can cause a particular repeater (304) to retransmit a communication, such as a voice message, that has been received by one of the receivers (311 ).
  • a similar group of receivers (316), links (317 and 318) and gate unit (319) are provided in the second communication system (302) to provide an identical configuration as that described above. Operation of this embodiment may now be described.
  • a first communication unit (321 ) situated within range of the first communication system (301 ) initiates the process by transmitting a request (322) to communicate with one or more other communication units (although this request could be to communicate with a particular identified talk group, for purposes of simplicity, this description will presume that the first communication unit identifies a particular second communication unit (323) as the desired communication target).
  • This talk request is transmitted on the appropriate control resource for the first communication system (301), and is relayed by the appropriate control resource repeater (304) to the resource controller (303) for the first communication system (301).
  • the resource controller (303) If the resource controller (303) recognizes the communication target as being local (as may be determined, for example, by the ID of the communication target), then the resource controller (303) can allocate a communication resource to support the requested communication as is currently done in the prior art. If, however, the resource controller (303) determines that the communication target is not local (or, if dealing with a talk group, is not completely local in all instances), then the resource controller -can transmit, on the control resource, an outbound signalling word constituting a notification that a communication with the second communication unit is desired.
  • This outbound communication (324) as sourced by the resource controller (303) and as transmitted by the appropriate control resource repeater (304) will be received by whichever of the receivers (316) in the second communication system (302) is monitoring that particular communication resource of the first system (301 ). That particular receiver (316) will then provide the signalling information via the appropriate link (317) to the resource controller (307) for the second communication system (302). If the second resource controller (307) recognizes the identified communication target as local, the resource controller (307) will assign one of its communication resources to support the communication, and will provide information identifying the allocated resource in an outbound transmission (326) on its control resource.
  • This transmission (326) will be received by the second communication unit (323) and cause the second communication unit (323) to begin monitoring the allocated communication resource of the second communication system.
  • This outbound transmission (326) will also be received by the corresponding receiver (311) of the first communication system (301 ).
  • This received signalling information will be provided to the resource controller (303) thereof via the appropriate link (312).
  • the resource controller (303) can now determine that the communication target has been located and that a communication resource in the second system (302) has been assigned to support the desired communication, will now assign one of its own communication resources to the first communication unit (321 ) to support the communication.
  • the first communication unit (321 ) will transmit its messages (for example, voice messages) using communication resources of the first communication system (301).
  • the repeater (304) in the first communication system (301) assigned to support this communication will receive these signals from the first communication unit (321) and will repeat them on the allocated communication resource (327).
  • the repeated voice message (327) will be received by the appropriate receiver (316) in the second communication system (302).
  • the resource controller (307) in the second communication system (302) will gate (319) this received voice message to the repeater (308) that has been assigned to support this communication.
  • the assigned repeater (308) will then retransmit the received signal (328) and this retransmission will be received by the second communication unit (323).
  • the same procedure could be implemented in reverse in a transmission trunked mode, or the already allocated resources could be used in a reversed pattern to accommodate a message trunked methodology.
  • a third general embodiment can be seen as depicted generally by the numeral 400.
  • the first communication system (401) comprises a home system.
  • this system includes a resource controller (403) that functions to control allocation of a first set of communication resources for benefit of a plurality of member communication units.
  • the communication resources are supported by a plurality of repeaters (404), that the communication resources themselves comprise a first set of frequency pairs A-C, and that one of the repeaters (404) supports system control information related to resource allocation requests and grants.
  • the resource controller (403) controls the repeaters (404) and interchanges resource allocation request and grant information through the repeaters (404), via an appropriate link (406).
  • the second communication system (402) similarly includes a resource controller (407), repeaters (408) (which support communication resources D-F) and an appropriate link (409) therebetween.
  • the communication resources A-C of the first system (401 ) are different from the communication resources D-F of the second system (402). Therefore, the two systems (401 and 402) are not able to communicate directly with one another through the repeaters provided.
  • the second communication system (402) also includes a plurality of receivers (416) that are capable of compatibly receiving the communication resources A-C of the home communication system (406). Although it would not necessarily be required that a receiver (416) be provided to accommodate each communication resource of the opposite system, in this embodiment such a receiver (416) has been so provided.
  • An appropriate communication link (417) is provided between the receivers (416) and the resource controller (407) to allow operation of the receivers (416) to be controlled, at least in part, by the resource controller (407), and also to allow the resource controller (407) to receive signalling information as received by the receivers (416) and as sourced from the resource controller (403) of the home system (401).
  • an appropriate link (418) is provided between the receivers (416) and the repeaters (408) of the second system (402).
  • This link (418) is appropriately gated (419) to allow the resource controller (407) to control provision of signals received by the receivers (416) to the repeaters (408).
  • the resource controller (407) can cause a particular repeater (408) to retransmit a communication, such as a voice message, that has been received by one of the receivers (416).
  • a similar group of receivers, links, and gate unit may be provided in the home communication system (401) to ⁇ rovide an identical configuration as that described above for the second system (402).
  • the plurality of member communication units for the home system will typically include one or more fleets or groups.
  • each such group is assigned an ID for each system that the radios are preregistered with.
  • This preregistration includes information regarding whether the ID represents a local group or roaming group. If the ID relates to a roaming (non- home) group, then the preregistration information should also include information regarding the home system for that group, including control resource information and the group ID for that home system.
  • the resource controller (407) for the second system i.e., the non-home system
  • a communication unit (423) that belongs to a home system group roams out of the home system (401) and into range of the second system (402).
  • This communication unit (423) locates the appropriate control resource for this system (this can be done in a number of ways; for example, the communication unit (423) can be previously provided with a list of likely adjacent control resources, or the unit (423) can automatically scan for a control resource when it loses the control resource for its home channel) and transmits (432) a message to the resource controller (407) for the second system to inform the second system of its presence.
  • This message includes the preregistered ID, which the resource controller (407) compares against its database (431) to identify the roaming unit (423) as belonging to a preregistered group from the first system (401 ).
  • the resource controller (407) for the second system can then determine that a roamer from the first system (401) has entered the second system (402), and a receiver (416) can be assigned to monitor the control resource of the first system (401 ).
  • a different communication unit (421), belonging to the group having the preregistered ID and being situated within range of the first communication system (401), may at any moment initiate a group call by transmitting a request (422) to communicate with its group.
  • This talk request is transmitted on the appropriate control resource for the first communication system (401), and is relayed by the appropriate control resource repeater (404) to the resource controller (403) for the first communication system (401 ).
  • the resource controller (403) responds to the request by allocating a communication resource to support the requested communication as is currently done in the prior art.
  • the allocation message from the resource controller includes the group ID for that home system (401) (which ID has been preregistered in the second system's (402) ID database (431)).
  • This outbound allocation message (424) as sourced by the resource controller (403) and as transmitted by the appropriate control resource repeater (404) will be received by whichever of the receivers (416) in the second communication system (402) is monitoring that particular communication resource of the first system (401 ). That particular receiver (416) will then provide the signalling information via the appropriate link (417) to the resource controller (407) for the second communication system (402).
  • the second resource controller (407) will recognize the ID as belonging to a roamer located in its system, and the resource controller (407) will assign one of the receivers (416) to monitor the allocated communication resource from the first system (401).
  • the controller (407) will also assign one of its own communication resources to support the communication, and cause an allocation message (426) to be transmitted. This allocation will occur in the usual manner via the control resource of the second system (402), and will be received by the second communication unit (423) and cause the second communication unit (423) to begin monitoring the allocated communication resource of the second communication system.
  • the first communication unit (421 ) will transmit its messages (for example, voice messages) using communication resources of the first communication system (401).
  • the repeater (404) in the first communication system (401) assigned to support this communication will receive these signals from the first communication unit (421 ) and repeat them on the allocated communication resource (427).
  • the repeated voice message (427) will be received by the appropriate receiver (416) in the second communication system (402).
  • the resource controller (407) in the second communication system (402) will gate (419) this received voice message to the repeater (408) that has been assigned to support this communication.
  • the assigned repeater (408) will then retransmit (428) the received signal and this retransmission will be received by the second communication unit (423), thereby including the second communication unit (423) in the group call.
  • the roaming unit (423) will leave the second system (402) and return to its home system (401). When this occurs, the roaming unit (423) will lose contact with the second system (402) and subsequently gain contact with the home system (401).
  • the roaming unit (423) Upon detecting the control resource of the home system (402), the roaming unit (423) will again register itself with the home system (401 ). As part of this process, the home system (401 ) will transmit a registration acknowledgement to the roaming unit (423) on the appropriate control resource.
  • the second system (402) which is still monitoring the control resource for the home system (401 ), will detect this acknowledgement, and determine that the roaming unit (423) is no longer within the second system (402).
  • the second system (402) will then deassign the roaming unit (423) and de-allocate the receiver (416) that had been previously allocated to monitor the home system (401). What is claimed is:

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)
  • Radio Relay Systems (AREA)

Abstract

Dans un mode de réalisation, les systèmes de transmission indépendants (101 et 102) comportent des récepteurs additionnels (112 et 113) qui leur permettent de contrôler mutuellement leurs canaux de signalisation de commande à destination de l'extérieur. La signalisation de commande secondaire (204) peut être imbriquée avec la signalisation de commande primaire (201) sur cette ressource de transmission, lesquelles informations de signalisation de commande secondaire sont destinées à être reçues et utilisées par le système de contrôle. Dans un autre mode de réalisation, des systèmes de transmission (301 et 302) possédant des ressources de transmission spécialisées sont pourvus de récepteurs (311 et 316) qui contrôlent les ressources de transmission des autres systèmes de transmission. Les communications entre des unités de transmission (321 et 323) dans divers systèmes sont permutées par l'interaction appropriée des répéteurs et des récepteurs spécialisés ainsi prévus. Dans un autre mode de réalisation, les systèmes de transmission (401 et 402) possédant des ressources de transmission spécialisées sont dotées de récepteurs (416) qui contrôlent les ressources de transmission d'autres systèmes de transmission, et des ''vagabonds'' (423) sont repérés (431) dans des systèmes extérieurs. Grâce à cette infrastructure, on peut remonter à la source d'un appel de groupe dans un système et retransmettre cet appel à des ''vagabonds'' situés dans d'autres systèmes.
EP19900908038 1989-05-30 1990-04-19 Method of establishing communication between independent communication systems Withdrawn EP0474675A4 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US35873089A 1989-05-30 1989-05-30
US358747 1989-05-30
US07/358,906 US5159695A (en) 1989-05-30 1989-05-30 Communication system to communication system communication system
US358730 1989-05-30
US358906 1989-05-30
US07/358,747 US5095529A (en) 1989-05-30 1989-05-30 Intersystem group call communication system and method

Publications (2)

Publication Number Publication Date
EP0474675A1 true EP0474675A1 (fr) 1992-03-18
EP0474675A4 EP0474675A4 (en) 1993-02-24

Family

ID=27408377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900908038 Withdrawn EP0474675A4 (en) 1989-05-30 1990-04-19 Method of establishing communication between independent communication systems

Country Status (5)

Country Link
EP (1) EP0474675A4 (fr)
JP (1) JP2571157B2 (fr)
AU (1) AU634234B2 (fr)
NZ (1) NZ233829A (fr)
WO (1) WO1990015488A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5212805A (en) * 1990-06-29 1993-05-18 Motorola, Inc. Near-field on-site/trunking system frequency sharing
US5581802A (en) * 1991-01-31 1996-12-03 Motorola, Inc. Method for providing service access information in a communication system
US5384776A (en) * 1991-02-22 1995-01-24 Erricsson Ge Mobile Communications Inc. Audio routing within trunked radio frequency multisite switch
US5276442A (en) * 1991-02-22 1994-01-04 Ericsson Ge Mobile Communications Inc. Dynamic address allocation within RF trunking multisite switch
US5241537A (en) * 1991-06-04 1993-08-31 Ericsson Ge Mobile Communications, Inc. Conventional base station interface architecture for RF trunking multisite switch
FI90181C (fi) * 1992-02-24 1993-12-27 Nokia Telecommunications Oy Telekommunikationssystem och ett abonnentautenticeringsfoerfarande
DE19805261C2 (de) * 1998-02-10 2001-09-13 Deutsche Telekom Mobil Verfahren zur Erkennung einer Internationalen Roaming-Beziehung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737978A (en) * 1986-10-31 1988-04-12 Motorola, Inc. Networked cellular radiotelephone systems
US4833701A (en) * 1988-01-27 1989-05-23 Motorola, Inc. Trunked communication system with nationwide roaming capability
EP0390214A2 (fr) * 1989-03-31 1990-10-03 E.F. Johnson Company Méthode et dispositif pour un réseau étendu distributif dans un système de communication mobile à radioconcentration

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4233473A (en) * 1978-08-31 1980-11-11 Frost Edward G Comprehensive automatic mobile radio telephone system
US4578815A (en) * 1983-12-07 1986-03-25 Motorola, Inc. Wide area coverage radio communication system and method
US4670905A (en) * 1985-11-29 1987-06-02 Motorola, Inc. Method and apparatus for coordinating independent communications systems
US4775999A (en) * 1986-10-31 1988-10-04 Motorola, Inc. Registration of radiotelephones in networked cellular radiotelephone systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737978A (en) * 1986-10-31 1988-04-12 Motorola, Inc. Networked cellular radiotelephone systems
US4833701A (en) * 1988-01-27 1989-05-23 Motorola, Inc. Trunked communication system with nationwide roaming capability
EP0390214A2 (fr) * 1989-03-31 1990-10-03 E.F. Johnson Company Méthode et dispositif pour un réseau étendu distributif dans un système de communication mobile à radioconcentration

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9015488A1 *

Also Published As

Publication number Publication date
AU5539290A (en) 1991-01-07
NZ233829A (en) 1992-09-25
JP2571157B2 (ja) 1997-01-16
AU634234B2 (en) 1993-02-18
JPH04506138A (ja) 1992-10-22
EP0474675A4 (en) 1993-02-24
WO1990015488A1 (fr) 1990-12-13

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