GB2289191A - Inter system handover in a multisystem mobile radio environment - Google Patents

Inter system handover in a multisystem mobile radio environment Download PDF

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Publication number
GB2289191A
GB2289191A GB9408381A GB9408381A GB2289191A GB 2289191 A GB2289191 A GB 2289191A GB 9408381 A GB9408381 A GB 9408381A GB 9408381 A GB9408381 A GB 9408381A GB 2289191 A GB2289191 A GB 2289191A
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United Kingdom
Prior art keywords
handover
intersystem
method
cell
determining
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Granted
Application number
GB9408381A
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GB2289191B (en
GB9408381D0 (en
Inventor
Nicholas William Whinnett
William Neil Robinson
Jonathan Alastair Gibbs
Anthony P Van Den Heuvel
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Motorola Solutions Inc
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Motorola Solutions Inc
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Publication date
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Priority to GB9408381A priority Critical patent/GB2289191B/en
Publication of GB9408381D0 publication Critical patent/GB9408381D0/en
Publication of GB2289191A publication Critical patent/GB2289191A/en
Application granted granted Critical
Publication of GB2289191B publication Critical patent/GB2289191B/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission and use of information for re-establishing the radio link
    • H04W36/0066Transmission and use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information

Abstract

A method for determining handover between different communications systems 10, 12, 14 eg. cellular, cordless, wireless PABX. Handover may be initiated manually or automatically, by reference to records of the associations of cells belonging to different systems, stored by the mobile. Bulletin boarder broadcasting details of available systems may also be used and the mobile 16, 18 may also scan for available systems. <IMAGE>

Description

COMMUNICATIONS SYSTEM Field of the Invention This invention relates in general to a method for determining an intersystem handover and more particularly to acquiring intersystem cell associations and determining an intersystem handover based on the intersystem cell associations.

Background to the Invention Mobile radio communications systems are well known in the art. There are a variety of types of mobile radio communications systems including trunked radio communications systems and cellular radio communications systems. Such communications systems include a plurality of mobile stations that communicate via infrastructure. The infrastructure includes a base station and a system controller. There are mobile radio communications systems that include mobile stations that communicate directly to one another. There is a trend to merge as many communications services as possible so that a single mobile station may be able to communicate in a number of different communications systems.

There is a progression to allow a mobile station have the versatility to continue communication in one call while passing through a different communications system. It is a growing desire to have uninterrupted service provision between different communications systems. Thus, the ability to continue a call while crossing system boundaries is becoming increasingly important.

Examples of such cell boundaries are between a public cellular system and an indoor office wireless PABX system or between a public cellular system and a domestic cordless system. There are numerous other examples as well.

One problem with having a mobile station that has the ability to communicate in different communication environments is how to determine when to handover from one communication system to another.

Thus, it is desired to have a method of determining a handover from one communications system to another in a multisystem environment.

Summarv of the Invention According to the present invention, a method is provided for determining an intersystem handover in a multisystem environment including acquiring intersystem cell associations and making a determination on whether to handover based on the intersystem cell association.

A preferred embodiment includes building a history of the intersystem cell associations. Alternative embodiments include accessing a bulletin board that has information on locally available systems and/or intersystem cell associations or determining handover based on user input and updating a history of intersystem cell associations.

Brief Description of the Drawing FIG. 1 shows a multisystem environment.

FIG. 2 is a flow chart for a preferred embodiment of the present invention.

Detailed Description of the Preferred Embodiment Referring to FIG. 1, there is shown a multisystem environment including three communications systems 10 12, 14 each having at least one particular area of coverage commonly referred to as a cell.

The size and shape of the cells are shown as merely suggestive and are not meant to be limiting. There are also shown two multimode radios 16, 18 that are capable of communicating in at least two of the shown communications systems.

The communications systems each have at least one cell site that includes a coverage area that overlaps or is near to a coverage area of a cell of a different communications system. For example, a first communication system 10 includes a cell 11 that has some of its coverage area 9 overlapping or in common with a cell 13 of a second communications system 12. A third communications system 14 has only one cell that is much smaller in relation to the cells of the other shown communications systems. The entire coverage area of the cell of the third communications system 14 falls entirely within a coverage area of cell 19 of the second communications system 12. Thus, when a mobile station is near or in the overlapping coverage areas and the mobile station has the ability to communicate in either communications system a decision on whether to handover may be made.The criteria of such a decision may include, quality of communications, available communications resources, cost of operating in a particular communications system, etc.

FIG. 2 shows a flow chart of a method for determining an intersystem handover including acquiring intersystem cell associations and making a determination on whether to handover based on the intersystem cell associations. Acquiring intersystem cell associations may be done by simply building a history of intersystem cell associations in terms of determining what are the parameters of the different cells and their associations to one another.

Particular cell associations are stored at the mobile stations and may for example include identification of domestic system cells on which a user is registered, identification of business system cells from which handover commonly occurs, identification of systems and cell(s) which are monitored when registered with a domestic system, identification of system and cell(s) which are monitored when registered with a business system, identification of system and cell(s) which are commonly accessed, e.g. airport, and manual updates and user preferences. An example of a domestic system may be a cordless telephone system used at home.

The identification of system and cell(s) which are monitored when registered with a system may be done in idle mode. The identification of business system cells from which handover commonly occurs or identification of other systems and cell(s) which are commonly accessed may be initially through a bulletin board.

The list of possible intersystem cell associations is not exhaustive. The intersystem cell associations are to help a mobile station adapt its behaviour to a user's usage pattern when in particular environment by providing information and a history of past behaviour in order for the mobile station to make a determination on behaviour, specifically, handover behaviour.

FIG. 2 is a flow chart of a preferred embodiment of the present invention. In the shown embodiment when a mobile station is active in a call in communications system A as in step 30 the mobile station must first determine whether there is a manual initiation handover or user update as in step 32. If not, the mobile system determines from its history or a collection of intersystem cell associations whether a handover is likely as in step 34. Thus, the mobile station must have access to records of particular cells and their relationship to cells of different systems. Such intersystem cell associations may be user initiated or a collection of past behaviour during similar circumstances.

If the cell records of the intersystem cell associations indicate that a handover is likely as determined in step 34 then the cell records also indicate what the possible candidate systems are for a handover. In step 36, the mobile station attempts to find the candidate systems in terms of validating whether the candidate systems are actually available for handover as in step 38.

If a candidate system is found it must be decided whether to handover. The user may be prompted to make such a decision as in step 40. If the user wishes to handover, the mobile station performs an intersystem handover and updates the cell records or history of the intersystem cell associations with the parameters surrounding the particular handover as in step 60.

If the user does not wish to handover to a candidate system as determined in step 40, it is determined whether a handover is necessary as in step 42. If a handover is not necessary, then the mobile station simply waits until a handover is determined as necessary in step 42.

If a handover is necessary as determined by step 42, then it is determined whether an intrasystem handover is available as in step 44. If an intrasystem handover is available, then an intrasystem handover is executed as in step 46 and the mobile station returns to step 32 and determines whether a manual initiation of an intersystem handover has been indicated.

If the mobile station needs to handover as determined in step 42 and is unable to handover to another cell in the currently active system as in step 44 then the mobile system attempts to find a bulletin board with information regarding locally available systems and/or intersystem cell associations as in step 48. If a bulletin board is available as in step 48 then the mobile station accesses the bulletin board in step 50 in an attempt to find a valid system available for handover as in step 54. If there is no bulletin board available as in step 48 then the mobile station performs an intersystem scan to find an available system for handover as in step 54. The system controller may also perform scans for the mobile station.

If a valid system is found that is available for handover in step 54 the user may be prompted and asked if he wishes to initiate an intersystem handover as in step 56. If yes, the intersystem handover is performed and the cell records of the intersystem cell associations are updated. If the user does not desire to handover as determined in step 56 then the cell records are updated and the call is terminated as in step 58.

If in step 32 a manual initiation is invoked or the user desires to attempt an intersystem handover, the mobile station performs a bulletin board access or an intersystem scan in step 31. If a valid system is found that is available for handover as determined by step 33 the mobile station is handed over to the new system and the cell records of the intersystem cell associations are updated with information regarding the handover as in step 60. If no valid system is found as determined by step 33 then the mobile station returns to step 32 and determines whether a manual initiation of an intersystem handover has been indicated.

The term handover has been used to refer to both seamless and non-seamless call continuation. A requirement of the present invention is that the mobile station may be able to operate in one or more communications systems or as a multimode mobile station as well as able to monitor a communications system when communicating on a different communications system.

The provisions of accessing bulletin boards which provides information on available communications systems as described in EPO Patent Application No. 90905266.4 enables a mobile station possibly establish a call handover when the mobile station has no other knowledge of a handover candidate system. The mobile station may also solicit relevant information from various system networks regarding their availability and cell associations.

There may also be a broadcast of coverage cell boundary information for particular systems that allows a mobile station to update its cell records and anticipate that an intersystem call handover may be required.

A mobile station according to the present invention identifies when an intersystem handover is likely by recognising that the current cell is stored in a cell record of intersystem cell associations.

If no possible handover candidates are found in the mobile station's cell records, the mobile station explores whether an intrasystem handover is required and possible. If not possible, the mobile station will search for potential handover candidates by scanning or polling system network. If inter-system handovers are not required or desired, intrasystem handovers are carried out between the cells of a system as normally required.

Further embodiments of the present invention include that when a handover candidate system has been identified and/or signal quality becomes poor with the handover candidate, the user may be prompted to confirm or deny handover operation and possibly choose which of the available systems to handover to.

Alternatively, the handover occurrences may be triggered automatically.

The method combines storage of intersystem cell associations, appropriate intersystem monitoring, access to bulletin board services, the generation of a user prompt, and the processing of a user response which together enables the triggering of an intersystem call handover or re-establishment. The present invention provides a mobile station a method for having uninterrupted service over different communications systems.

Claims (11)

Claims
1. A method for determining an intersystem handover in a multisystem environment including at least two communications systems where each communication system has at least one cell site with coverage area near or in common with a cell site of a different communications system, the method comprising the steps of: acquiring intersystem cell associations; and determining an intersystem handover based on intersystem cell associations.
2. The method of claim 1 wherein the step of acquiring comprises building a history of intersystem cell associations.
3. A method for determining an intersystem handover between different communications systems where each communications system has at least one cell site that includes coverage area near or in common with a cell site of a different communications system, the method comprising the steps of: accessing a bulletin board that provides information on available systems; and determining an intersystem handover based on the information from the bulletin board.
4. The method of claim 3 wherein the bulletin board further provides information on intersystem cell associations.
5. The method of claim 4 further comprising the step of updating a history of intersystem cell associations with information regarding the handover.
6. A method for determining an intersystem handover between different communications systems where each communications system has at least one cell site that includes coverage area near or in common with a cell site of a different communications system, the method comprising the steps of: determining an intersystem handover based on user input; and updating a history of intersystem cell associations with information regarding the handover.
7. The method of any of the preceding claim wherein the step of determining is performed at a mobile station.
8. The method of any of the preceding claims wherein the step of determining takes account of user preferences, either manually or automatically triggered.
9. The method of any of the preceding claims wherein the requirement for a handover is determined by quality measurements made on the communications system currently communicating over.
10. The method of any of the preceding claims wherein the requirement for a handover is determined by cell information broadcast on the communications system currently communicating over or on a bulletin board.
11. A method for determining a handover substantially as herein described with reference to FIG. 2 of the drawing.
GB9408381A 1994-04-28 1994-04-28 Communications system Expired - Lifetime GB2289191B (en)

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GB9809393A GB2322051B (en) 1994-04-28 1994-04-28 Communications system

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GB2289191A true GB2289191A (en) 1995-11-08
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WO2000018170A1 (en) * 1998-09-22 2000-03-30 Telia Ab (Publ) Improvements in, or relating to, communication system
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AU774659B2 (en) * 1999-06-07 2004-07-01 Nec Corporation Handover between mobile communication networks
US8676203B2 (en) 1999-06-07 2014-03-18 Nec Corporation Handover between mobile communication networks
GB2352586A (en) * 1999-06-07 2001-01-31 Nec Corp Handover between mobile networks
WO2001043461A3 (en) * 1999-12-10 2001-12-13 Ericsson Inc Psp matching in gprs-136hs
WO2001043461A2 (en) * 1999-12-10 2001-06-14 Ericsson Inc. Psp matching in gprs-136hs
WO2002009464A1 (en) * 2000-07-25 2002-01-31 Siemens Aktiengesellschaft Method for the improved cell selection for multi-mode radio stations in the idle state
CN100502590C (en) 2002-12-06 2009-06-17 高通股份有限公司 Techniques for supporting GSM to W-CDMA reselection
WO2004054286A2 (en) * 2002-12-06 2004-06-24 Qualcomm, Incorporated Techniques for supporting gsm to w-cdma reselection
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WO2004060012A2 (en) * 2002-12-27 2004-07-15 Koninklijke Philips Electronics N.V. A radio resource management and reuse scheme in multi-standard wireless communication system
WO2004060012A3 (en) * 2002-12-27 2005-02-03 Jiang Cheng A radio resource management and reuse scheme in multi-standard wireless communication system
TWI383700B (en) * 2003-11-24 2013-01-21 Dj Wireless Llc Hybrid communication system and method for wireless data communication
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GB2417397B (en) * 2004-08-20 2007-01-10 Nec Technologies Mobile radio communications device and related method of operation
GB2417397A (en) * 2004-08-20 2006-02-22 Nec Technologies Mobile radio communications device including selective initiation of handover
WO2011075897A1 (en) * 2009-12-24 2011-06-30 Nokia Corporation A method and corresponding apparatus for coordinating executions of intra-radio handover
US9326203B2 (en) 2009-12-24 2016-04-26 Nokia Technologies Oy Method and corresponding apparatus for coordinating executions of intra-radio handover

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GB2289191B (en) 1998-12-16
GB9408381D0 (en) 1994-06-22
GB2322051B (en) 1998-12-16
GB2322051A (en) 1998-08-12
GB9809393D0 (en) 1998-07-01

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