CA2129666A1 - System for implementating extension phones within a cellular radio telecommunications system - Google Patents
System for implementating extension phones within a cellular radio telecommunications systemInfo
- Publication number
- CA2129666A1 CA2129666A1 CA002129666A CA2129666A CA2129666A1 CA 2129666 A1 CA2129666 A1 CA 2129666A1 CA 002129666 A CA002129666 A CA 002129666A CA 2129666 A CA2129666 A CA 2129666A CA 2129666 A1 CA2129666 A1 CA 2129666A1
- Authority
- CA
- Canada
- Prior art keywords
- mobile
- call
- routing
- received
- response
- 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.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/12—Inter-network notification
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
- H04M15/70—Administration or customization aspects; Counter-checking correct charges
- H04M15/765—Linked or grouped accounts, e.g. of users or devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
- H04M15/70—Administration or customization aspects; Counter-checking correct charges
- H04M15/765—Linked or grouped accounts, e.g. of users or devices
- H04M15/7652—Linked or grouped accounts, e.g. of users or devices shared by users
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
- H04M15/80—Rating or billing plans; Tariff determination aspects
- H04M15/8033—Rating or billing plans; Tariff determination aspects location-dependent, e.g. business or home
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/24—Accounting or billing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2215/00—Metering arrangements; Time controlling arrangements; Time indicating arrangements
- H04M2215/32—Involving wireless systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2215/00—Metering arrangements; Time controlling arrangements; Time indicating arrangements
- H04M2215/72—Account specifications
- H04M2215/724—Linked accounts
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2215/00—Metering arrangements; Time controlling arrangements; Time indicating arrangements
- H04M2215/72—Account specifications
- H04M2215/724—Linked accounts
- H04M2215/7245—Shared by users, e.g. group accounts or one account for different users
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2215/00—Metering arrangements; Time controlling arrangements; Time indicating arrangements
- H04M2215/74—Rating aspects, e.g. rating parameters or tariff determination apects
- H04M2215/7435—Location dependent, e.g. Bussiness or home
Abstract
A method and system for implementing extension phone service within a mobile radio communication system. A plurality of mobile stations (M1-M10) are assigned to a single subscriber number and a record maintained as to the current location of each mobile station. In response to a call received for the subscriber number, each mobile station (M1-M10) is paged in the respective mobile switching center (MSC) in which it is currently located. The call is selectively routed to one of the mobile stations responding to the page request in accordance with preselected criteria (31) such as, the first mobile station to respond (32), the mobile station which is closest to the calling party (37), etc.
Description
~12 vl ,S ~ 7i SYSTEM FC)R I MPLEMENTI NG ~XTENSI ON PHON13S ~: .
WI THI N A CELLULAR RADI O TELECOMMUNI CATI QNS SYSTEM
. ~
BAC~GROUND OF THE I NVE:NTI ON -Hi~ry o:f .th~ P;~iQr Ar~
Cellular radio commuIlication ~ervice i~ defined and specifi d by a plurality of industxy standards adopted by group~ coDIprised of both manufacturer~ and operators of cellular ~y~tems. For example, the EIA/TIA requ~rements :10 ~ as t forth in Standard IS-41-B provide that a call within a cellular radio ~y6tem i~ initially routed to ~
particulax mobile switching center ~(MSC) in accox~ance with location data identifying the call ed mobile s~ation - :: (MS) wh~ch is stored in the home location regis:ter lHLR) : of that p~rt~cular ub~criber. Thersafter, pa:ging of the called ~obile ~tation takes place in the MSC to which the c~ routed and, if the locatio~ data ~tored in the --HLR i8 aorrec:t and th~ ~obile ~ta~ion i8 currantly ~n an ~: ~cti~e a~l ps:~wer~d on s~a~e, the MS respoIld~ to the page a~d the call ~ill be co~pleted.
Another~recen~ 13IA/TIA Standard, IS-53, contemplates that exten~ion phones may be providsd to mobile stations .. within the cellular sy~t~m. In such a~ implementatlon, a ~ingle directory number withir~ the 6y~tel~l would be ` - 212~
WI THI N A CELLULAR RADI O TELECOMMUNI CATI QNS SYSTEM
. ~
BAC~GROUND OF THE I NVE:NTI ON -Hi~ry o:f .th~ P;~iQr Ar~
Cellular radio commuIlication ~ervice i~ defined and specifi d by a plurality of industxy standards adopted by group~ coDIprised of both manufacturer~ and operators of cellular ~y~tems. For example, the EIA/TIA requ~rements :10 ~ as t forth in Standard IS-41-B provide that a call within a cellular radio ~y6tem i~ initially routed to ~
particulax mobile switching center ~(MSC) in accox~ance with location data identifying the call ed mobile s~ation - :: (MS) wh~ch is stored in the home location regis:ter lHLR) : of that p~rt~cular ub~criber. Thersafter, pa:ging of the called ~obile ~tation takes place in the MSC to which the c~ routed and, if the locatio~ data ~tored in the --HLR i8 aorrec:t and th~ ~obile ~ta~ion i8 currantly ~n an ~: ~cti~e a~l ps:~wer~d on s~a~e, the MS respoIld~ to the page a~d the call ~ill be co~pleted.
Another~recen~ 13IA/TIA Standard, IS-53, contemplates that exten~ion phones may be providsd to mobile stations .. within the cellular sy~t~m. In such a~ implementatlon, a ~ingle directory number withir~ the 6y~tel~l would be ` - 212~
-2- Patent Application Docket ~17227/0026 associated with two or more individual mobile stations, each of which would have a different mobile identification number (MIN) and a different elec~ronic serial number (ESN). Thus, in order to provide extension phone ~ervice, the HLR must keep separate ~ets of location data for each of the two or more mobile units that have been: ~as~igned tho Bame directory numbGr. The idea behind cellular exte~ion phone aer~ice specified by ; IS-53 i~ that the two or ~ore extension phones would be :' 10: ~ paged simultaneouBly and the call would be completed to the fir~t extension phone to respond. I f the extension : :phones are locatod within an area served by the same MSC, a: call~ to a directory: number associated with two or more : ~ extension phonefi could be completed by simultaneou61y 15~ ~ pagi;ng each of thos~e extension phone~ in that MSC and then completing~the call to the first one that re~ponds in acaordance with:IS-41-B. However, if one or more of :::: the extension: phone~ :a~ociated w1th the sa~e directory number are looàted in different MSCs, such implementation 20~ o~f extension phone~service is not po~ible. That is, a call cannot be,~routed to more than one MSC at the same time ial current ~cellular networks.
::The~provl~ion of: extension phone service within a :mobile radio ;oommuni~catic)n system, ~uch as a cellulax 25~ y~te~or a persona~l com~unication ~y~tem (PCSl, would ~e very useful:in~a:number of di~f~rent applications. For example, a cell;ular ~ sub~cribQr ~ may want to have only a single.directory~number a~slgned:to hi8~her service, but ~:: yet receive~cal~ls o n a~obile station installed in a car 30:': when i~ is being used and on a transportabls/portable in~trument on other occasion Thi~ would prov.ide an optimum ~leve 1 o~ ~convenienoe for ~uch a ~ubscriber and simplify both: the~ ~ cost and ~ervice by only requiring a :-.,~
~ 1 2 ~ ra -3- Pat~nt Application Docket #17227/0026 single directory number~ In other applications of cellular extension phone service, a Bervice provid~r such as a delivery service, or an emergency ambul ance ser~rice, may desire to have only a ~t ngle directory li~ting for calls for it~ ~ervice yet have such call~ directed to and responded to by either the UTlit which was nlO8t r~adily available ox tha unit which was phy3ically close~t to the perso~ reque~ting the service from the provider. Such an imple~sntat~ on would greatly enhanc~ the efficiency of :lO fiuch service provider~ and ~nable, ln the casQ of : ~ e~ergency ervice~such as~ambulance, fire, poli~e, etc., an éfficient directing of ~ervice re~ue6ts to those able to provide the most rapid re~ponRe.
The~ syste~ of the preæent invention enables ths :~ 15 ~ implementation o~E extension phons ~ervice within 2 mobile radio communication ~yRtem~ in a way which is hi~hly : ~ efficient and effective.
SUMMARY OF TH~ INVENTION
~: ~ 20 ~ In one aspect, the present invention provides the assignment of a sing1e directory number to two or more mo}:ile~ station~ each having different MINB. When a call recsived by~ the HLR to which that directc~ry nu~er is a~igned, a pagin g mesBage i~ ~en~ to each MSC: within 25: :~ which ~ach of ~the extension pho~e ~obile ~tations is hown to be located:within th~ record~ of the HLR. The mobile stations~are paged in each MSC. The call is routed to ~he MSC within which the first mobile station to re~pond to the~page ia located and the call completed ~30 : to tha~ station whether or not it is the only station responding or the fir~t of a plurality stations which may re~ pond. ~:
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~ 1 2 ~
::The~provl~ion of: extension phone service within a :mobile radio ;oommuni~catic)n system, ~uch as a cellulax 25~ y~te~or a persona~l com~unication ~y~tem (PCSl, would ~e very useful:in~a:number of di~f~rent applications. For example, a cell;ular ~ sub~cribQr ~ may want to have only a single.directory~number a~slgned:to hi8~her service, but ~:: yet receive~cal~ls o n a~obile station installed in a car 30:': when i~ is being used and on a transportabls/portable in~trument on other occasion Thi~ would prov.ide an optimum ~leve 1 o~ ~convenienoe for ~uch a ~ubscriber and simplify both: the~ ~ cost and ~ervice by only requiring a :-.,~
~ 1 2 ~ ra -3- Pat~nt Application Docket #17227/0026 single directory number~ In other applications of cellular extension phone service, a Bervice provid~r such as a delivery service, or an emergency ambul ance ser~rice, may desire to have only a ~t ngle directory li~ting for calls for it~ ~ervice yet have such call~ directed to and responded to by either the UTlit which was nlO8t r~adily available ox tha unit which was phy3ically close~t to the perso~ reque~ting the service from the provider. Such an imple~sntat~ on would greatly enhanc~ the efficiency of :lO fiuch service provider~ and ~nable, ln the casQ of : ~ e~ergency ervice~such as~ambulance, fire, poli~e, etc., an éfficient directing of ~ervice re~ue6ts to those able to provide the most rapid re~ponRe.
The~ syste~ of the preæent invention enables ths :~ 15 ~ implementation o~E extension phons ~ervice within 2 mobile radio communication ~yRtem~ in a way which is hi~hly : ~ efficient and effective.
SUMMARY OF TH~ INVENTION
~: ~ 20 ~ In one aspect, the present invention provides the assignment of a sing1e directory number to two or more mo}:ile~ station~ each having different MINB. When a call recsived by~ the HLR to which that directc~ry nu~er is a~igned, a pagin g mesBage i~ ~en~ to each MSC: within 25: :~ which ~ach of ~the extension pho~e ~obile ~tations is hown to be located:within th~ record~ of the HLR. The mobile stations~are paged in each MSC. The call is routed to ~he MSC within which the first mobile station to re~pond to the~page ia located and the call completed ~30 : to tha~ station whether or not it is the only station responding or the fir~t of a plurality stations which may re~ pond. ~:
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~ 1 2 ~
-4- Patent Application Docket #17227/0026 In another aspect, the sy~tem of the pre6ent invention pages each mobile station extension a~sociated with the direatory number being called ~imultaneously, but routes the call ~o the MSC of the mobile station which is geographically closest to the ~all~ng party.
In a ~till further aspect, the invention include~
providing extension phone service within a mobile radio communlcation 8ystem by as~ociating a plurality of moblle station~, each haYing a u~iqu8 identification, ~ 10 with a slngle ~ubscriber nu~ber. A call received at an : ~ exchange i d$rected:to the 6ubscrib~r number with which a plurality of mobile stations are associated. A list of parameters i8 maintained in a databaRe which identifies each mobile ~tatlon associated with the ~ub~criber number and the exchange within which each of ~he mobile ~tations ; is ~believed to be ourrently located. A routing request message is sent to:the location within whlch each mobile station 1~ ~peclfixd in the databa~e as currently being : 1OGa~ed. Each mobile 6tation is paged in the exchang~ at ~.
~ ~which a routi~g regue~t wa~ received. An indication as :to which one~ ~f~th~ mobile ~tatlo~s have re~ponded to a page i received at the call recelving exchange and the all i8 8el~tively routad to one of ~he mo~ile ~ations a~: to which a~ page~ responae was received.
:: 25 ~ yet another aspect of the i~ye~ivn, &,all~ are : ~ routed within a~ radl~eY~'whic~a~ingle sub~criber number may bz associ~ted with one or more mobile ~ta~ions, each having a unique mobile ident$fication number. A location r~quest me~sage is ~:~ 30 received fro~ à~ intPrrogation ~xchange indicative of a : call to a 6ub~cribar having a sLngle sub8crib~r number.
~hether or not there i~ more than ons ~obil~ station : ~ a8~0ciated wlth the ~ingle subscriber nNmber for which - : ~
'''''' .
In a ~till further aspect, the invention include~
providing extension phone service within a mobile radio communlcation 8ystem by as~ociating a plurality of moblle station~, each haYing a u~iqu8 identification, ~ 10 with a slngle ~ubscriber nu~ber. A call received at an : ~ exchange i d$rected:to the 6ubscrib~r number with which a plurality of mobile stations are associated. A list of parameters i8 maintained in a databaRe which identifies each mobile ~tatlon associated with the ~ub~criber number and the exchange within which each of ~he mobile ~tations ; is ~believed to be ourrently located. A routing request message is sent to:the location within whlch each mobile station 1~ ~peclfixd in the databa~e as currently being : 1OGa~ed. Each mobile 6tation is paged in the exchang~ at ~.
~ ~which a routi~g regue~t wa~ received. An indication as :to which one~ ~f~th~ mobile ~tatlo~s have re~ponded to a page i received at the call recelving exchange and the all i8 8el~tively routad to one of ~he mo~ile ~ations a~: to which a~ page~ responae was received.
:: 25 ~ yet another aspect of the i~ye~ivn, &,all~ are : ~ routed within a~ radl~eY~'whic~a~ingle sub~criber number may bz associ~ted with one or more mobile ~ta~ions, each having a unique mobile ident$fication number. A location r~quest me~sage is ~:~ 30 received fro~ à~ intPrrogation ~xchange indicative of a : call to a 6ub~cribar having a sLngle sub8crib~r number.
~hether or not there i~ more than ons ~obil~ station : ~ a8~0ciated wlth the ~ingle subscriber nNmber for which - : ~
'''''' .
-5- Patent Application Docket #17227/0026 ~:
:
the location reque~t me~sage was received is determined.
The call is completed to the mobile ~tation in re~ponse to a determination that there is only one mobile station a~ociat~d with th~ ingle subscriber numbe~ In 5 / response to a determlnation that th~re i~ more that one mobile station identification number associated with the single subscriber number, a routing request mes~age for : ~ each o~ the assoolsted mobile station identification numberR is sent~ to the curren~ location at which the : mobile station ~ s believed to be located. Each mobile tatlon identification number i~ page at the location in response to the ~ receipt of a routing request message.
: The receipt of page re~poDses from each of the page~ is monitored for;a preselected period of ti~e and a recovery 15~ pro~eaure is initiat~d in response to failure to receive any:~page respon~es dur1ng ~he preselected period of time.
The call~is completed~to the mobile 6tation from which a page re ponse i~ recs}ved in respon~e to the rec~ipt of only~ sne page respons:e. A call routing decision is made 20~ in a~ccordancn ~wlth ~predefined criteria in r~sponse to the receipt ~of more ;than one :page ~e3pon~e from the paged mobile st~tions ~ and ~ the call is routed from the :
interrogatio~ exahange to one of the ~plurality of mobile stations in aoc~rdance with thn call routing decision.
BEU EF DESCRI PTI OlI OF THE D~WI NGS
For a~ more cs~mplete~ under~tanding of the ~?re~ent inyention and for:further objects and advantag~s thereof~
reference may now b~ had to the foll~owing description : ~, 3 0 : : `: taken ~ n conjunction with th~ accompanying drawing~, in which~
. 1 1s;a;pictorial representation of a cellular ~-radio communication syste~ including a mobile switchiny ` ~ ."''' `'`, ~
' ~
';'~..
3 s~`~ S
:
the location reque~t me~sage was received is determined.
The call is completed to the mobile ~tation in re~ponse to a determination that there is only one mobile station a~ociat~d with th~ ingle subscriber numbe~ In 5 / response to a determlnation that th~re i~ more that one mobile station identification number associated with the single subscriber number, a routing request mes~age for : ~ each o~ the assoolsted mobile station identification numberR is sent~ to the curren~ location at which the : mobile station ~ s believed to be located. Each mobile tatlon identification number i~ page at the location in response to the ~ receipt of a routing request message.
: The receipt of page re~poDses from each of the page~ is monitored for;a preselected period of ti~e and a recovery 15~ pro~eaure is initiat~d in response to failure to receive any:~page respon~es dur1ng ~he preselected period of time.
The call~is completed~to the mobile 6tation from which a page re ponse i~ recs}ved in respon~e to the rec~ipt of only~ sne page respons:e. A call routing decision is made 20~ in a~ccordancn ~wlth ~predefined criteria in r~sponse to the receipt ~of more ;than one :page ~e3pon~e from the paged mobile st~tions ~ and ~ the call is routed from the :
interrogatio~ exahange to one of the ~plurality of mobile stations in aoc~rdance with thn call routing decision.
BEU EF DESCRI PTI OlI OF THE D~WI NGS
For a~ more cs~mplete~ under~tanding of the ~?re~ent inyention and for:further objects and advantag~s thereof~
reference may now b~ had to the foll~owing description : ~, 3 0 : : `: taken ~ n conjunction with th~ accompanying drawing~, in which~
. 1 1s;a;pictorial representation of a cellular ~-radio communication syste~ including a mobile switchiny ` ~ ."''' `'`, ~
' ~
';'~..
3 s~`~ S
-6- Patent Application Docket #17227/0026 center, a plurality of base stations, and a plurality of mobile stations;
FIG. 2 is a block diagram illustrating the routing of callQ within a cellular radio telecommunications system in acaordance with prior art routi~g standards;
FIG. 3 is a mes~ag~ ~xchange diagram illu6trating the routi~g of a call within a cellular radio telecommun~cations ~ystPm in accoraance with prior ar~
routing standard~;
FIG. 4 is a flow chart illu~trating cellular extension service provided in accordance with ~he present i nventi on; and FIG. 5 is an illustrative diagram setti~g forth one aspect of the in~lement:ation of extensiorl phone service in a cellular raaio telecommunications ~ystem in ~ccordance with the teachings of the present inverltion.
; : DETAILED DESCRIPTION
Refexring fir~t to FIG. 1, there is illustrated a conventional cellular radio communications syst~:m of the typ~ to which the pre~ent invention generally psrtaills. ~:
In FïG. 1, an arbi~rary geographic area may be diviaed into a plurality of continuous radio covs3rage areas, or ~: cell~ C1-C:10. ~ While the system of FIG. 1 is us~ratively sho~ tc> i~clud~ only ~0 cell~ and 1 MSC, ::
it should b~ clearly u~d~rsts:30d that in practice, the . .-number o~ MSC8 and cell~ within ~ach MSC will be much: ~ ~
1 axger. : - .
Associated wlth and located within each of the celLs C1-Clû is a bass station a~signed as a corresponding one::
of a plurality of ba6e 6tation~ Bl-B10. 33ach of the ba~e :~
stations BloB10 include a tran~ter, a receiver, and a ba~e ~tatio~ controller a~ arla well known in the art. In '' ', 2 ~ 5 -7- Patent Application Docket #17227/00~6 FI G. 1, the bas e 6 tati ons B 1 -B 10 are i l l u~ trati vel y loca~ed at the center of each of the cells C1-C10, respectively, and are equipped with omni-directional antsnnas. However, in other configurations of a cellular radio ~ystem, the base stations B1-B10 may be located n ar the periphery, or otherwise away from the center~ of the c~lls C1-C10 and ~ay illuminate the cells C1-C10 with radio signals either omni-dir~ctionally or directionally.
Thersfore, the repre~entation of the cellular radio ystem of FIG. 1 i~ for purposefi of illustration only and is not intended a~ a limitation on the po~ible implementations of the cellular radio Ry~tem within which the By tem of the present invention i8 implemented.
With continuing reference to FIG. 1, a plurality of : 15 mobile station~ M1-M10 may be found within the cells Cl-C10. Again, on1y lO mobile stations a~e shown in FIG. 1 but it ~hould~ be~understood that the actual number of mobile:station~ will be mu~h-larger in practice and will invariably~greatly exceed the number of base ~tatio~.
2~0 ~ ~ Moreover, while none of the mobile stations M1-M10 may be .-f~ound in ~ome of tha c~lls C1-C10, the pre~ence or ab~ence of the~ mobile tation~ M1-M10 in any particular ~:
: : .
: o~ of the c~ C1-C1:0 should be under~tood to depend, in prac~ice on~the individual de~ires of the mobile ~:f25 ~ statlon~ M1-MlO who may roam from one loaation in the ; cell to another~or from one c811 to an adjacent cell or ~eighbo~ing cell, ~and, in addition, from one cellular radio ~y~tem served by a particular MSC to another ~uch ey~tem served by a different MSC.
Each of the ~mobile stations Ml-M10 i~ ~apable of ini~iat~ng or receivi~g a telephone call through one or more of the ba~e~station~ Bl-B10 and a mobils ~witching center MSC. A mobile ~wntching center MSC is connected - .
'' ,.
'~', .
. r. ,~ f~ r ~ 5 ~`~3~3 -8- Patent ~pplication Docket #17227~0026 by communication links, e.g., cables, to each of the illustrative base station~ B1-B10 and to ths fixed public ~wi~ched tslephone network PSTN, not shown, or a similar fixed network which may include an integrated services digital network (ISDN~ facility. The MSC ~hown is al~o connected to other MSCs making up the cellular radio ~ystem n~twork. The relevant con~ecttons between the : mobile switch1ng center MSC and the base stations Bl-B10, or between the: ~mobil e switching center MSC and the PSTN
or ISDN and other MSC~, are not completely ~hown in ~IG.
1 but are well known to those of ordinary skill in the art. Si mi 1 arl Y, i t i s al 6 0 known to include more than one mobil~ switching: center in a cellular radio system ~: ~ and to~connect each additional mobile switch~ng center to 15~ a different group of ba6e stations ~nd to other mobile switching centerR ~ia cable or radio links .
Each of the ce11s C1-C10 is allocated a plurality of voice ~or speech channel~ and at lea6t one access or con~rol channel,~ such a~ a forward control channel ~ ~FOCC), The control channel is used to control or : supervise the operation of mobile stations by means of ~; : information transmitted to and received from those unit~
Such i~formati;on ~may include inco~ing call signals, outgoing call ~ignal~, page signals, pa~e response 25: ; ~ signals, location; registration ~ignals, voice channel a~ign~ents and :maintenance instructions. The control or voice channels may operate either in an analog or digi~l mode or a ~combination thereof.
: ~ Ref~rring next to FIG. 2, there i3 ~hown a block diagram of a~ :portion of a cellular radio ~y~tem illu~tratiny the routing of inco~ing c:all~ within that sy~tem in ac~ordance with EIA/TIA IS-41. In suah call completion procedures, a call received for a directory 2 ~ 2 ~3 ~J .~ 3 -g- Patent Application Docket #17227/0026 number assigned to a mobile station is received at an interrogation exchange 11 which ~ends a location request ~ignal 12 to the home exchange or home location register (HLR) a~sociated with the mobile station to which the S call i8 directed 13. rhe home exchange or HLR co~sults its database to determlne the current phy~ical location of the mobile station assigned to the directory number ; bein~ called and identifies a particular v~ited exchangeor visited location register within the sygtem a~ the current location of the called mobile station. A routing request î4 is sent to the vi~itea location register or visited exchange 15. Referring in more detail to the message exchange diagram ~hown in FIG. 3, the visited : : lo~ation register or ~i~ited exchange 15 ~ends a routing ~ reque~t~rsturn :re~ult 16 to the H~R 13, such me~sage i~cluding a temporary routing number. The HLR 13 forward the: temporary routing number in a lscation request return result me3sage 17 to the interrogation ~ :: :: : :
exchange 11.~ ~he call i8 then ~outed to the current : ;~ location of: the mobile 18 where it is paged 19 and the : c:all:completed to the mobile i~ it respo~d~ to the page.
A~ illu~trated in FIGS. 2 and 3, paging of a mobile station in~acoord~nce with IS-41 doas not occur until after the call ha~ been rout~d to the vislted exchanse.
;25 ~ Thu8, in the ~ttemp~sd i~pla~entatio~ of extension phone ~ service within ~a cellular radlo 6y8te~ a3 func~ionally : defined by IS-53, two aifferent mobile ~tation~ a~signed the same directory number cannot be ~aged eimultaneously unleRs bo~h 8tatio~B are loca~ed in the same exchange.
~, .
30 ~ Of cour~e, ona csuld first routs the call to ar~ exchanye where a fir8t moblle station assigned to th~3 directory ;~
number waR belie~ed to b~ located, pagE3 that mobile in ~hat ~xchange and wait for it to respo~d and then, only ~-' ~:
, ~ J 2 ~
-10- Patent Application Docket #17227/0026 aftsr failure to receivs a page ~esponsQ, advise the interrogation exchange to reroute the call to a se ond exchange where another mobile station extension assigned to that directory number wa6 believed to be located.
S Such a proce~s would be highly cumber~ome, ~low, ~nd inade~uatQ to supply the needs of the ~ellular radio industry.
~ t~chni~ue used in the ~ystem of the present invention i6 that of paging to locate a ~obile statlon within a visitod exchang2 prior to the routing of the call to that exchange. Thus, if the ~obile station fails to an~wer the page, the call i8 never routed to the visited exchange ~aving substantial co~t and time. Such techniqueæ arc de cribed in co-pending U.S. patent application ~erial no. 07/756,487, filed September 25, 1991, entitled "Apparatus and Method of Directing Calls :: to Mobile Telephone Subscribers~', in the name o~ John .: -~: Hayes, et al. and U. S. patent applicati~n ~erial no.
: û7~516, 122, filed April 27~ 1990, entitled "Multi~
Exchange Paging System for Locating a Mobile Telephone in a Wide Area Telephone Network", in the na~e of ~ancy Buhl, et al., both of which are as~igned to the as~ignee : ~ of ~he pre~ent invention and incorporated by r~ference here~ n.
25~ In the present yste~, ~hen a call direct~d to a : mobile ~ubscriber i~ received at an inte~rog~ion ..
exchange, the HLR~ of that ~ubscriber i~ consulted to `.
obtain information . identify1 ng the MSC ~erving its present location. ~ That MSC is then requested to page the : 30 mobile ~ta~ion: and then re~poIld to ~he HI.R with an ~ -i~dication as ~o whether or not the mobile station was ~ -~ound. If tha mobile s~ation has responded to the page, -the call i8 ~heIl routed ts tha~ MSC fQr completion of ~he , 6 ~ ~3 -ll- Patent Application Docket #17227/0026 call to the mobile station. This concept of paging a mobile 6tation prior to routing the call was introduced primarily to overcome the uncertainties in the location data stored in the HLR for a cellular subscriber and S ~ minimize needless routing of cal~s to improper locations and the attendant circuit time associated therewith. The paging prior to routing concept is expanded in the system of the pre~ent invention to provide efficient implementation of extension phone 6ervice within a cellular radio telephone system.
~In the pres~ent 6ystam, a home location register maintains location data independently for each mobile station~within a group of mobile stations a~signed to the same directory~number. Upon the rece$pt of a call to be 15~ terminated to ~th:at directory number, the interrogation ~exchange reguest the MSCs identiied in the HLR location :: : : :
data correspondi~ng to the belie~ed current location of ea~ch ~mobile station to page each mobi~e ~tation in accordance with 1ts~MIN/ESN. All of the MSCs then page 20 ~ the relevant moblle stations in a quasi-simultaneous fashiQn~rega~rdles 8 to their proximity to or 5 eparation from one~another.~ Since each mobile unit being paged is identifi~ed by~a~separate MINJESN, all of the moblle units associated with~;the dlrectory number may be located in 25~ the saMe MSC and~paged there ~imultaneou~}y. Similarly, all mobi1e~units~ may be located;i~ diferent MSCs and each page~ separately~in itfi respective MSC. Al~ paging requests from the interrogation exchange to th~ MSCs are treated independently~from one another since eaah MS is :30: ~ identified~: by~ a~ specific MIN/ESN combination, or : otherwi~e, by speci~ic data u~ed on the air interface of the ~ystem~
.
: ~: :: ~ : : :
::
::
~ P 2 -12- Patent Application Docket #17227/0026 Af~er ~he page reque~ts are executed, each MSC ln which an MS was paged reports to the interrogation exchange a3 to whether or not a page respons e has been received from the paged mobile station. The interrogation exchange then routeB the ca~l to one of the : MSCs which has received a page respon~e f~om the paged mobile station. Different techniques can be u~ed to select which ~obile station extension phone the call is : to be routed to in the event more than on6 mobile station ~ an wered ~he page from its a~sociated MSC. Several ~: different criteria can be used by the HLR to make the 6election. For example, the interrogation exchangQ may salect to route the call toward the MSC which first send~
:: : it~ a positive acknowledgement indicat~ng that the paged mobi1e station~has;answered the page and/or been placed on a voice channel in that MSC. In addition, ~ach mobile tation in a group o~ mobile 6 tati on8 aa ~ i g~ed as .~ .
extension pho~es to~ the ~ame directory rlumber may have ~ :~
prea8signed prioritiPs and the H~R ~ay treat multiple ~ responses in accorda~ce with these assigned priorities. ~ -The a6~igrled priorities may be permanen~ly fixed aB to the: re~pect1ve exten~ion phones or they may be ~bject to ~:
ch~ ge withln the~ databa~e in accsrdance wi~h a ~:
pre~elected priority modification algorithm. Fur~her, ::~
25~ : : : the interrogatio~ MSC may analyze: the location of the ~:
c~ll1ng ~ party by ~ using the MSC identity of the origin~ting I~SC :and th~ location where th~ page respo~ae was received using the MSC-ID of the MSC having obtained the page responses:. : The~e data ~ay be u~3d ln order to ~- route the call ~oward ths responding mobile station that i3 close t to~the cal1er. Thi~ woul~ be a particularly ;-useful call routing scheme in th~ ca~e o~ emergsncy ~:
.
~J ~ ;3 -13- Patent Application Docket #17227/0026 s ervi ces S Uch a5 the Ufi e of extenS i on phone~ i n ambulances, police C ars, etc.
Referring next to the flow chart shown in FIG~ 4, there i8 illustrated a procedure by which extension 5phone~ within a cellular radio system may be implemented in accorda~ce with the teachings of the present invention. In FIG~ 4, the system receives at 21 a location request~m~ssage regarding a call to a subscri~er with a given sub~criber number. At 221 the system ::~ 10determine~ whether or not more than one mobile ::~ identification number (MIN)~ exists for the subscriber number to which the call is directed. If not, the system move~ to 23 at~whlch the call i8 delivered to the mobile stati~n corre~ponding to th~ MIN a~signed to the ~15 ~ ~ subscrlber number to which~the call is direc~ed and i~
accordance with the~procedure speci~ied in ~IA/TIA IS-41, or example. If, ~ however, at 22, it i~ determined that more than one mabils~tation identi~led by more than one MI;N ha~ been~as~igned to the ~ub~cri~er dixectory number 20 ~to;which the~call~ was directed, the ~ystem move~ to 24 and :the ~HLR of ~ the ~ directory number sends a routing reque~t message;~for each MIN to the V~R or vigited MSC
ide;~tified in~the~H~LR database as being the current location of ea~ch:~of the mobile gtations corresponding to ~;25~e~ach MIN aesig~ed;to that ~ubseribsr nu~ber. At 25, eaoh mob11e;station corresponding to each MIN i8 then paged at the relevant VLR/MSC~for each of ~he routing mes~ages received by it rom; the interrogation exchange sending the multipl~ ~me~sages. At 26, the HLR monitor~ the ~: 30 ~respon8es~ rece1ved fro~ the routing requests s~nt out to the several VLR/MSCs for a selected period o time.
If, at 26,~ tbe HLR receives no signals in re~pon~e to the routing regue8t messages it sent to each MSC
, ~ 1 2 ~
-14- Patent Application Docket #17227/0026 identified as the current location of a mobile station corresponding to each MIN, then the system moves to 27 and initiates recovery procedures for no page response ~uch as, for example, call transfer to another number or a no re~pon~e ~ignal to the calling party. Thereafter, the routing ends at 28. I f, at 26, only one response was . ,~
received hy the HI,R, indicating that only one of thP
paged MSæ re~ponded by sending a page respon~e signal to it:5 paging MSC:, then the ~y6tem moves to 29 and the call is delivered to the extension phone of the mobile station identified by the MIN responding to the page at the MSC
where it is currently located.
l f, at 26, the HLR receives two or more messages indicating the receipt of page re~ponse~ from the paged MS~, the system moves to 31 at which routing decision~
~ased upon pr~defined criteria are evaluated for this particular su~:scriber number. For example, th~3 system ~ight move to ~2 at which ~he call ~ould l:>e rou~e~ toward the MSC as60ciated with ths mobile station having the MIN
20 ~ ~ ~ which fir~t responded to a page after the rou~ing requests were sent from the HLR. In ~uch a ca~e, the ystem would then deliver the cail to the extensio~ phone : of th~ mobile ation having the MIN first responding to ~: th~ pag~ at 33 and ~hen end at 28. Alternatively, the ~ sy~te~ could move from the routing deci~ion at 31 to a cr1terion beginning at 34 in whioh the c:all was to be routed in accordance with certain priorities assigned to th~ ~ariou~ MINs asRociated with the various plurality of ext2nsion phone mobile statiQns as~igned to the ~ subscriber number. At 35, th~ re~ponse6 are arranged in priority order after they havs been received from the MSCs at which page xespo~se6 w~rs recal~sd for each MIN.
Finally, at 36, the call i~ dalivered to ~he extension J~
-15- Patent Application Docket #17227jO026 phone corresponding to the MIN with the highest priority responding to th~e page and then the routine ends at 28.
By way of further alternative, the routing decision ~ ~ contained within the criteria at 31 may include movement : ~ 5~ to 37 at which the call i8 to be routed toward the mobile tation Iocated clo~est to the calling 6ubs riber. In thls case, the~; ~ 8y8~tem then mQves to 38 at which it oalculates the~di~stancea between t~e lnterrogation exchange a~d the~ VLR~SC at which page re6ponse6 were 10~ received from th~mobile extension phones having MINs as to ~which a ~ page ~response was received. This can be implem0nted by~means~ of a lookup table or a predefined algorithm dri~ven~by the location of the interrogating exchange and~the location of the various MSCs. Finally, 15~ the~call is~del~ivered to the ext~nsion phone which is olosest~to the~ca11ing subscriber. The latter technique of~call~routing~may~be~ particularly applicable in the ase~ of~ ~emergéncy~services such as police, fire, ~ ambulance, etc.
,~ 20~ Referring~ next~;to FIG. 5, there is shown a block diagram/flow diagram, in which a sequence of steps are illustrated~ln;ithe~implementatlon of extension phone s~rvloe within a~cellular radio system in accordance with the~teachings~o~ the present inve:ntion. As shown in FIG.
2~ 4,~a call i8~received a~ an interrogatlon exchange or ;gateway~MSC-41~for~a~pa~rticular directory number to w~i¢h a~plurality~of extension phones, ~each having different identification criteria such a~ differen~ MIN~, ESNs, etc., are a~fiigned. Next, lnfor~at~on related to the 30~ Gall is sent~at;~;;42 to the HLR 43 corre~ponding to the directory nu~ber for which the aall i~ intended.
A8~u~ing there~ are two extension phone mQbile sta~ions, MSl and MS2, ~ ldentifled ~ within the HhR a~ being ~ ~ :
:
-16- Patent Application Docket #17227/0026 associated with the directory number for which the call . is intended, the HLR then forwards the call information ; at 44 and 45 to MSC1 46 and MSC2 47 identified, re6pectively, in the databa6e of the HLR as being the current location of MS1 and MS2, respectively. Next, : : : : MSC:l page~ MSl:wit~hin its location and MSC2 pages MS2 in its location. ; AB illustrated, no page response is received f~om ~MS1 at MSCl, but a page respon6e is receiv~d from MS2 at MSC2. Thus, a no routing message 48 ~ 10 ~ is :~ent~ from~MSCl to H~R 43 while a routing number : mes6age 49 i5 sent:from MSC2 to the HLR 43. The routing number is forwarded:in a message 51 from the HLR 43 tO
: the gateway MSC 4:1 and, thereafter, the incoming call to : the gateway ~MSC~41 $s~routed at 52a-c to MSC2 47 for ; 15~ completion of the call:to MS2.
Thus, lt~can be seen~from the above description that r~ extension phone;servi~e within a cellular radio system : may: be enabled in a logical and orderly manner in :accordance wi:th the teaching of the pre~ent invention.
20~ The pre~ent~invention provides optimized cellular radio e~xten~ion phone~:s:ervice in a~manner which can be flexibly configured in~àocordance with the particular nee~s of the oellular radio s~ubscri~ber reque6ting such service.
For~n~tanoê, ~the inventlon de~crlbed herein could 25~ :be~appll~d wit~h~the~same method and principles to other :: :types o f ~oblle :~ radio co~mun1cation such as tho~e : ~ propo~ed for Personal Communication~ Servlces ~PCS). PCS
may provi~e call delivery in a manner ~imilar to that of ::
cellular radlo.systems bu~ employ other air interface 30 ~ ~ technique~ not currently con~idered " cellular~ uch as CT2, ~CT2~+, CT3, ~DECT and others. The present system for :: implementing exten~ion pho~e 6ervice could be implemented : : : `: : :
: ~ within ~uch~ PCS 6ystems. In another example, the method ~
- ~:
~ ~ h 3 ~ 5 ~
-17- Patent Application Docket #17227/0026 and principles of the present invention described herein could use an implem~ntation whereby, upon detection of a call to a ~ingle directory number, the HLR consults another database called a Service Control Point ~SCP) to obtain the list of MINs atta~hed to ths directory number along with the criteria for selection of a page re~ponse, priority for each MIN~ geographical data ana any other ~elat~d information. The SCP ~an ~e co-located with ~n H~R or can be a di~tinct node within the cellular network.
It i6 believed that the operation and construction of the present invention will be apparent from the foregoing description. While the method and apparatus shown a~d described ha~ been characterized a~ i8 being preferred, obvious change~ and modification~ may be made : therein without departing from the 6pirit and scope of the inYention as defined in the following claim~.
.
FIG. 2 is a block diagram illustrating the routing of callQ within a cellular radio telecommunications system in acaordance with prior art routi~g standards;
FIG. 3 is a mes~ag~ ~xchange diagram illu6trating the routi~g of a call within a cellular radio telecommun~cations ~ystPm in accoraance with prior ar~
routing standard~;
FIG. 4 is a flow chart illu~trating cellular extension service provided in accordance with ~he present i nventi on; and FIG. 5 is an illustrative diagram setti~g forth one aspect of the in~lement:ation of extensiorl phone service in a cellular raaio telecommunications ~ystem in ~ccordance with the teachings of the present inverltion.
; : DETAILED DESCRIPTION
Refexring fir~t to FIG. 1, there is illustrated a conventional cellular radio communications syst~:m of the typ~ to which the pre~ent invention generally psrtaills. ~:
In FïG. 1, an arbi~rary geographic area may be diviaed into a plurality of continuous radio covs3rage areas, or ~: cell~ C1-C:10. ~ While the system of FIG. 1 is us~ratively sho~ tc> i~clud~ only ~0 cell~ and 1 MSC, ::
it should b~ clearly u~d~rsts:30d that in practice, the . .-number o~ MSC8 and cell~ within ~ach MSC will be much: ~ ~
1 axger. : - .
Associated wlth and located within each of the celLs C1-Clû is a bass station a~signed as a corresponding one::
of a plurality of ba6e 6tation~ Bl-B10. 33ach of the ba~e :~
stations BloB10 include a tran~ter, a receiver, and a ba~e ~tatio~ controller a~ arla well known in the art. In '' ', 2 ~ 5 -7- Patent Application Docket #17227/00~6 FI G. 1, the bas e 6 tati ons B 1 -B 10 are i l l u~ trati vel y loca~ed at the center of each of the cells C1-C10, respectively, and are equipped with omni-directional antsnnas. However, in other configurations of a cellular radio ~ystem, the base stations B1-B10 may be located n ar the periphery, or otherwise away from the center~ of the c~lls C1-C10 and ~ay illuminate the cells C1-C10 with radio signals either omni-dir~ctionally or directionally.
Thersfore, the repre~entation of the cellular radio ystem of FIG. 1 i~ for purposefi of illustration only and is not intended a~ a limitation on the po~ible implementations of the cellular radio Ry~tem within which the By tem of the present invention i8 implemented.
With continuing reference to FIG. 1, a plurality of : 15 mobile station~ M1-M10 may be found within the cells Cl-C10. Again, on1y lO mobile stations a~e shown in FIG. 1 but it ~hould~ be~understood that the actual number of mobile:station~ will be mu~h-larger in practice and will invariably~greatly exceed the number of base ~tatio~.
2~0 ~ ~ Moreover, while none of the mobile stations M1-M10 may be .-f~ound in ~ome of tha c~lls C1-C10, the pre~ence or ab~ence of the~ mobile tation~ M1-M10 in any particular ~:
: : .
: o~ of the c~ C1-C1:0 should be under~tood to depend, in prac~ice on~the individual de~ires of the mobile ~:f25 ~ statlon~ M1-MlO who may roam from one loaation in the ; cell to another~or from one c811 to an adjacent cell or ~eighbo~ing cell, ~and, in addition, from one cellular radio ~y~tem served by a particular MSC to another ~uch ey~tem served by a different MSC.
Each of the ~mobile stations Ml-M10 i~ ~apable of ini~iat~ng or receivi~g a telephone call through one or more of the ba~e~station~ Bl-B10 and a mobils ~witching center MSC. A mobile ~wntching center MSC is connected - .
'' ,.
'~', .
. r. ,~ f~ r ~ 5 ~`~3~3 -8- Patent ~pplication Docket #17227~0026 by communication links, e.g., cables, to each of the illustrative base station~ B1-B10 and to ths fixed public ~wi~ched tslephone network PSTN, not shown, or a similar fixed network which may include an integrated services digital network (ISDN~ facility. The MSC ~hown is al~o connected to other MSCs making up the cellular radio ~ystem n~twork. The relevant con~ecttons between the : mobile switch1ng center MSC and the base stations Bl-B10, or between the: ~mobil e switching center MSC and the PSTN
or ISDN and other MSC~, are not completely ~hown in ~IG.
1 but are well known to those of ordinary skill in the art. Si mi 1 arl Y, i t i s al 6 0 known to include more than one mobil~ switching: center in a cellular radio system ~: ~ and to~connect each additional mobile switch~ng center to 15~ a different group of ba6e stations ~nd to other mobile switching centerR ~ia cable or radio links .
Each of the ce11s C1-C10 is allocated a plurality of voice ~or speech channel~ and at lea6t one access or con~rol channel,~ such a~ a forward control channel ~ ~FOCC), The control channel is used to control or : supervise the operation of mobile stations by means of ~; : information transmitted to and received from those unit~
Such i~formati;on ~may include inco~ing call signals, outgoing call ~ignal~, page signals, pa~e response 25: ; ~ signals, location; registration ~ignals, voice channel a~ign~ents and :maintenance instructions. The control or voice channels may operate either in an analog or digi~l mode or a ~combination thereof.
: ~ Ref~rring next to FIG. 2, there i3 ~hown a block diagram of a~ :portion of a cellular radio ~y~tem illu~tratiny the routing of inco~ing c:all~ within that sy~tem in ac~ordance with EIA/TIA IS-41. In suah call completion procedures, a call received for a directory 2 ~ 2 ~3 ~J .~ 3 -g- Patent Application Docket #17227/0026 number assigned to a mobile station is received at an interrogation exchange 11 which ~ends a location request ~ignal 12 to the home exchange or home location register (HLR) a~sociated with the mobile station to which the S call i8 directed 13. rhe home exchange or HLR co~sults its database to determlne the current phy~ical location of the mobile station assigned to the directory number ; bein~ called and identifies a particular v~ited exchangeor visited location register within the sygtem a~ the current location of the called mobile station. A routing request î4 is sent to the vi~itea location register or visited exchange 15. Referring in more detail to the message exchange diagram ~hown in FIG. 3, the visited : : lo~ation register or ~i~ited exchange 15 ~ends a routing ~ reque~t~rsturn :re~ult 16 to the H~R 13, such me~sage i~cluding a temporary routing number. The HLR 13 forward the: temporary routing number in a lscation request return result me3sage 17 to the interrogation ~ :: :: : :
exchange 11.~ ~he call i8 then ~outed to the current : ;~ location of: the mobile 18 where it is paged 19 and the : c:all:completed to the mobile i~ it respo~d~ to the page.
A~ illu~trated in FIGS. 2 and 3, paging of a mobile station in~acoord~nce with IS-41 doas not occur until after the call ha~ been rout~d to the vislted exchanse.
;25 ~ Thu8, in the ~ttemp~sd i~pla~entatio~ of extension phone ~ service within ~a cellular radlo 6y8te~ a3 func~ionally : defined by IS-53, two aifferent mobile ~tation~ a~signed the same directory number cannot be ~aged eimultaneously unleRs bo~h 8tatio~B are loca~ed in the same exchange.
~, .
30 ~ Of cour~e, ona csuld first routs the call to ar~ exchanye where a fir8t moblle station assigned to th~3 directory ;~
number waR belie~ed to b~ located, pagE3 that mobile in ~hat ~xchange and wait for it to respo~d and then, only ~-' ~:
, ~ J 2 ~
-10- Patent Application Docket #17227/0026 aftsr failure to receivs a page ~esponsQ, advise the interrogation exchange to reroute the call to a se ond exchange where another mobile station extension assigned to that directory number wa6 believed to be located.
S Such a proce~s would be highly cumber~ome, ~low, ~nd inade~uatQ to supply the needs of the ~ellular radio industry.
~ t~chni~ue used in the ~ystem of the present invention i6 that of paging to locate a ~obile statlon within a visitod exchang2 prior to the routing of the call to that exchange. Thus, if the ~obile station fails to an~wer the page, the call i8 never routed to the visited exchange ~aving substantial co~t and time. Such techniqueæ arc de cribed in co-pending U.S. patent application ~erial no. 07/756,487, filed September 25, 1991, entitled "Apparatus and Method of Directing Calls :: to Mobile Telephone Subscribers~', in the name o~ John .: -~: Hayes, et al. and U. S. patent applicati~n ~erial no.
: û7~516, 122, filed April 27~ 1990, entitled "Multi~
Exchange Paging System for Locating a Mobile Telephone in a Wide Area Telephone Network", in the na~e of ~ancy Buhl, et al., both of which are as~igned to the as~ignee : ~ of ~he pre~ent invention and incorporated by r~ference here~ n.
25~ In the present yste~, ~hen a call direct~d to a : mobile ~ubscriber i~ received at an inte~rog~ion ..
exchange, the HLR~ of that ~ubscriber i~ consulted to `.
obtain information . identify1 ng the MSC ~erving its present location. ~ That MSC is then requested to page the : 30 mobile ~ta~ion: and then re~poIld to ~he HI.R with an ~ -i~dication as ~o whether or not the mobile station was ~ -~ound. If tha mobile s~ation has responded to the page, -the call i8 ~heIl routed ts tha~ MSC fQr completion of ~he , 6 ~ ~3 -ll- Patent Application Docket #17227/0026 call to the mobile station. This concept of paging a mobile 6tation prior to routing the call was introduced primarily to overcome the uncertainties in the location data stored in the HLR for a cellular subscriber and S ~ minimize needless routing of cal~s to improper locations and the attendant circuit time associated therewith. The paging prior to routing concept is expanded in the system of the pre~ent invention to provide efficient implementation of extension phone 6ervice within a cellular radio telephone system.
~In the pres~ent 6ystam, a home location register maintains location data independently for each mobile station~within a group of mobile stations a~signed to the same directory~number. Upon the rece$pt of a call to be 15~ terminated to ~th:at directory number, the interrogation ~exchange reguest the MSCs identiied in the HLR location :: : : :
data correspondi~ng to the belie~ed current location of ea~ch ~mobile station to page each mobi~e ~tation in accordance with 1ts~MIN/ESN. All of the MSCs then page 20 ~ the relevant moblle stations in a quasi-simultaneous fashiQn~rega~rdles 8 to their proximity to or 5 eparation from one~another.~ Since each mobile unit being paged is identifi~ed by~a~separate MINJESN, all of the moblle units associated with~;the dlrectory number may be located in 25~ the saMe MSC and~paged there ~imultaneou~}y. Similarly, all mobi1e~units~ may be located;i~ diferent MSCs and each page~ separately~in itfi respective MSC. Al~ paging requests from the interrogation exchange to th~ MSCs are treated independently~from one another since eaah MS is :30: ~ identified~: by~ a~ specific MIN/ESN combination, or : otherwi~e, by speci~ic data u~ed on the air interface of the ~ystem~
.
: ~: :: ~ : : :
::
::
~ P 2 -12- Patent Application Docket #17227/0026 Af~er ~he page reque~ts are executed, each MSC ln which an MS was paged reports to the interrogation exchange a3 to whether or not a page respons e has been received from the paged mobile station. The interrogation exchange then routeB the ca~l to one of the : MSCs which has received a page respon~e f~om the paged mobile station. Different techniques can be u~ed to select which ~obile station extension phone the call is : to be routed to in the event more than on6 mobile station ~ an wered ~he page from its a~sociated MSC. Several ~: different criteria can be used by the HLR to make the 6election. For example, the interrogation exchangQ may salect to route the call toward the MSC which first send~
:: : it~ a positive acknowledgement indicat~ng that the paged mobi1e station~has;answered the page and/or been placed on a voice channel in that MSC. In addition, ~ach mobile tation in a group o~ mobile 6 tati on8 aa ~ i g~ed as .~ .
extension pho~es to~ the ~ame directory rlumber may have ~ :~
prea8signed prioritiPs and the H~R ~ay treat multiple ~ responses in accorda~ce with these assigned priorities. ~ -The a6~igrled priorities may be permanen~ly fixed aB to the: re~pect1ve exten~ion phones or they may be ~bject to ~:
ch~ ge withln the~ databa~e in accsrdance wi~h a ~:
pre~elected priority modification algorithm. Fur~her, ::~
25~ : : : the interrogatio~ MSC may analyze: the location of the ~:
c~ll1ng ~ party by ~ using the MSC identity of the origin~ting I~SC :and th~ location where th~ page respo~ae was received using the MSC-ID of the MSC having obtained the page responses:. : The~e data ~ay be u~3d ln order to ~- route the call ~oward ths responding mobile station that i3 close t to~the cal1er. Thi~ woul~ be a particularly ;-useful call routing scheme in th~ ca~e o~ emergsncy ~:
.
~J ~ ;3 -13- Patent Application Docket #17227/0026 s ervi ces S Uch a5 the Ufi e of extenS i on phone~ i n ambulances, police C ars, etc.
Referring next to the flow chart shown in FIG~ 4, there i8 illustrated a procedure by which extension 5phone~ within a cellular radio system may be implemented in accorda~ce with the teachings of the present invention. In FIG~ 4, the system receives at 21 a location request~m~ssage regarding a call to a subscri~er with a given sub~criber number. At 221 the system ::~ 10determine~ whether or not more than one mobile ::~ identification number (MIN)~ exists for the subscriber number to which the call is directed. If not, the system move~ to 23 at~whlch the call i8 delivered to the mobile stati~n corre~ponding to th~ MIN a~signed to the ~15 ~ ~ subscrlber number to which~the call is direc~ed and i~
accordance with the~procedure speci~ied in ~IA/TIA IS-41, or example. If, ~ however, at 22, it i~ determined that more than one mabils~tation identi~led by more than one MI;N ha~ been~as~igned to the ~ub~cri~er dixectory number 20 ~to;which the~call~ was directed, the ~ystem move~ to 24 and :the ~HLR of ~ the ~ directory number sends a routing reque~t message;~for each MIN to the V~R or vigited MSC
ide;~tified in~the~H~LR database as being the current location of ea~ch:~of the mobile gtations corresponding to ~;25~e~ach MIN aesig~ed;to that ~ubseribsr nu~ber. At 25, eaoh mob11e;station corresponding to each MIN i8 then paged at the relevant VLR/MSC~for each of ~he routing mes~ages received by it rom; the interrogation exchange sending the multipl~ ~me~sages. At 26, the HLR monitor~ the ~: 30 ~respon8es~ rece1ved fro~ the routing requests s~nt out to the several VLR/MSCs for a selected period o time.
If, at 26,~ tbe HLR receives no signals in re~pon~e to the routing regue8t messages it sent to each MSC
, ~ 1 2 ~
-14- Patent Application Docket #17227/0026 identified as the current location of a mobile station corresponding to each MIN, then the system moves to 27 and initiates recovery procedures for no page response ~uch as, for example, call transfer to another number or a no re~pon~e ~ignal to the calling party. Thereafter, the routing ends at 28. I f, at 26, only one response was . ,~
received hy the HI,R, indicating that only one of thP
paged MSæ re~ponded by sending a page respon~e signal to it:5 paging MSC:, then the ~y6tem moves to 29 and the call is delivered to the extension phone of the mobile station identified by the MIN responding to the page at the MSC
where it is currently located.
l f, at 26, the HLR receives two or more messages indicating the receipt of page re~ponse~ from the paged MS~, the system moves to 31 at which routing decision~
~ased upon pr~defined criteria are evaluated for this particular su~:scriber number. For example, th~3 system ~ight move to ~2 at which ~he call ~ould l:>e rou~e~ toward the MSC as60ciated with ths mobile station having the MIN
20 ~ ~ ~ which fir~t responded to a page after the rou~ing requests were sent from the HLR. In ~uch a ca~e, the ystem would then deliver the cail to the extensio~ phone : of th~ mobile ation having the MIN first responding to ~: th~ pag~ at 33 and ~hen end at 28. Alternatively, the ~ sy~te~ could move from the routing deci~ion at 31 to a cr1terion beginning at 34 in whioh the c:all was to be routed in accordance with certain priorities assigned to th~ ~ariou~ MINs asRociated with the various plurality of ext2nsion phone mobile statiQns as~igned to the ~ subscriber number. At 35, th~ re~ponse6 are arranged in priority order after they havs been received from the MSCs at which page xespo~se6 w~rs recal~sd for each MIN.
Finally, at 36, the call i~ dalivered to ~he extension J~
-15- Patent Application Docket #17227jO026 phone corresponding to the MIN with the highest priority responding to th~e page and then the routine ends at 28.
By way of further alternative, the routing decision ~ ~ contained within the criteria at 31 may include movement : ~ 5~ to 37 at which the call i8 to be routed toward the mobile tation Iocated clo~est to the calling 6ubs riber. In thls case, the~; ~ 8y8~tem then mQves to 38 at which it oalculates the~di~stancea between t~e lnterrogation exchange a~d the~ VLR~SC at which page re6ponse6 were 10~ received from th~mobile extension phones having MINs as to ~which a ~ page ~response was received. This can be implem0nted by~means~ of a lookup table or a predefined algorithm dri~ven~by the location of the interrogating exchange and~the location of the various MSCs. Finally, 15~ the~call is~del~ivered to the ext~nsion phone which is olosest~to the~ca11ing subscriber. The latter technique of~call~routing~may~be~ particularly applicable in the ase~ of~ ~emergéncy~services such as police, fire, ~ ambulance, etc.
,~ 20~ Referring~ next~;to FIG. 5, there is shown a block diagram/flow diagram, in which a sequence of steps are illustrated~ln;ithe~implementatlon of extension phone s~rvloe within a~cellular radio system in accordance with the~teachings~o~ the present inve:ntion. As shown in FIG.
2~ 4,~a call i8~received a~ an interrogatlon exchange or ;gateway~MSC-41~for~a~pa~rticular directory number to w~i¢h a~plurality~of extension phones, ~each having different identification criteria such a~ differen~ MIN~, ESNs, etc., are a~fiigned. Next, lnfor~at~on related to the 30~ Gall is sent~at;~;;42 to the HLR 43 corre~ponding to the directory nu~ber for which the aall i~ intended.
A8~u~ing there~ are two extension phone mQbile sta~ions, MSl and MS2, ~ ldentifled ~ within the HhR a~ being ~ ~ :
:
-16- Patent Application Docket #17227/0026 associated with the directory number for which the call . is intended, the HLR then forwards the call information ; at 44 and 45 to MSC1 46 and MSC2 47 identified, re6pectively, in the databa6e of the HLR as being the current location of MS1 and MS2, respectively. Next, : : : : MSC:l page~ MSl:wit~hin its location and MSC2 pages MS2 in its location. ; AB illustrated, no page response is received f~om ~MS1 at MSCl, but a page respon6e is receiv~d from MS2 at MSC2. Thus, a no routing message 48 ~ 10 ~ is :~ent~ from~MSCl to H~R 43 while a routing number : mes6age 49 i5 sent:from MSC2 to the HLR 43. The routing number is forwarded:in a message 51 from the HLR 43 tO
: the gateway MSC 4:1 and, thereafter, the incoming call to : the gateway ~MSC~41 $s~routed at 52a-c to MSC2 47 for ; 15~ completion of the call:to MS2.
Thus, lt~can be seen~from the above description that r~ extension phone;servi~e within a cellular radio system : may: be enabled in a logical and orderly manner in :accordance wi:th the teaching of the pre~ent invention.
20~ The pre~ent~invention provides optimized cellular radio e~xten~ion phone~:s:ervice in a~manner which can be flexibly configured in~àocordance with the particular nee~s of the oellular radio s~ubscri~ber reque6ting such service.
For~n~tanoê, ~the inventlon de~crlbed herein could 25~ :be~appll~d wit~h~the~same method and principles to other :: :types o f ~oblle :~ radio co~mun1cation such as tho~e : ~ propo~ed for Personal Communication~ Servlces ~PCS). PCS
may provi~e call delivery in a manner ~imilar to that of ::
cellular radlo.systems bu~ employ other air interface 30 ~ ~ technique~ not currently con~idered " cellular~ uch as CT2, ~CT2~+, CT3, ~DECT and others. The present system for :: implementing exten~ion pho~e 6ervice could be implemented : : : `: : :
: ~ within ~uch~ PCS 6ystems. In another example, the method ~
- ~:
~ ~ h 3 ~ 5 ~
-17- Patent Application Docket #17227/0026 and principles of the present invention described herein could use an implem~ntation whereby, upon detection of a call to a ~ingle directory number, the HLR consults another database called a Service Control Point ~SCP) to obtain the list of MINs atta~hed to ths directory number along with the criteria for selection of a page re~ponse, priority for each MIN~ geographical data ana any other ~elat~d information. The SCP ~an ~e co-located with ~n H~R or can be a di~tinct node within the cellular network.
It i6 believed that the operation and construction of the present invention will be apparent from the foregoing description. While the method and apparatus shown a~d described ha~ been characterized a~ i8 being preferred, obvious change~ and modification~ may be made : therein without departing from the 6pirit and scope of the inYention as defined in the following claim~.
.
Claims (24)
1. A method for providing extension phone service within a mobile radio communication system, comprising:
associating a plurality of mobile stations, each having a unique identification, with a single subscriber number;
receiving a cell directed to said subscriber number to which a plurality of mobile stations are associated;
maintaining in a database a list of parameters identifying each mobile station associated with said subscriber number and the exchange within which each of said mobile stations is believed to be currently located;
sending a routing request message to the location within which each mobile station is specified in the database as currently being located;
paging each mobile station in the exchange at which a routing request was received;
receiving an indication as to which ones of said mobile stations have responded to a page; and selectively routing the call to one of the mobile stations as to which a page response was received.
associating a plurality of mobile stations, each having a unique identification, with a single subscriber number;
receiving a cell directed to said subscriber number to which a plurality of mobile stations are associated;
maintaining in a database a list of parameters identifying each mobile station associated with said subscriber number and the exchange within which each of said mobile stations is believed to be currently located;
sending a routing request message to the location within which each mobile station is specified in the database as currently being located;
paging each mobile station in the exchange at which a routing request was received;
receiving an indication as to which ones of said mobile stations have responded to a page; and selectively routing the call to one of the mobile stations as to which a page response was received.
2. A method for providing extension phone service within a mobile radio communication system as set forth in claim 1, wherein said page response indication receiving step comprises:
starting a timer for measuring a preselected time period after sending said routing request messages;
initiating recovery procedure in response to the failure to receive a page response indication within said preselected time period.
starting a timer for measuring a preselected time period after sending said routing request messages;
initiating recovery procedure in response to the failure to receive a page response indication within said preselected time period.
3. A method for providing extension phone service within a mobile radio communication system as set forth in claim 1, wherein said selective routing step comprises:
routing the call to only one of a plurality of mobile stations from which page responses were received, said one being selected in accordance with a set of preselected criteria.
routing the call to only one of a plurality of mobile stations from which page responses were received, said one being selected in accordance with a set of preselected criteria.
4. A method for providing extension phone service within a mobile radio communication system as set forth in claim 1, wherein said selective routing step comprises:
storing in a database a priority indication with respect to each of said mobile stations associated with said single subscriber number;
consulting said database in response to the receipt of a paging response indication with respect to more than one of said mobile stations; and routing the call to the mobile station having the highest priority among those from which a page response was received.
storing in a database a priority indication with respect to each of said mobile stations associated with said single subscriber number;
consulting said database in response to the receipt of a paging response indication with respect to more than one of said mobile stations; and routing the call to the mobile station having the highest priority among those from which a page response was received.
5. A method for providing extension phone service within a mobile radio communication system as set forth in claim 1, wherein said selective routing step comprises:
selectively routing the call to the first one of the mobile stations from which a page response was received.
selectively routing the call to the first one of the mobile stations from which a page response was received.
6. A method for providing extension phone service within a mobile radio communication system as set forth in claim 1, wherein said selective routing step comprises:
storing in a database a table of geographic relationships between exchanges from which calls for mobile subscriber number may be received and exchanges within which mobile stations associated with those number may be located;
consulting said table in response to the receipt of a paging response indication with respect to more than one of said mobile stations; and routing the call to the mobile station from which a page response was received which is geographically closest to the exchange from which the call for said subscriber number was received.
storing in a database a table of geographic relationships between exchanges from which calls for mobile subscriber number may be received and exchanges within which mobile stations associated with those number may be located;
consulting said table in response to the receipt of a paging response indication with respect to more than one of said mobile stations; and routing the call to the mobile station from which a page response was received which is geographically closest to the exchange from which the call for said subscriber number was received.
7. A method for providing extension phone service within a mobile radio communication system as set forth in claim 1, wherein said selective routing step comprises:
storing an algorithm for calculating the geographic relationships between exchanges from which calls for mobile subscriber number may be received and exchanges within which mobile stations associated with those numbers may be located;
calculating with said algorithm, in response to the receipt of a paging response indication with respect to more than one of said mobile stations, the respective distances between the exchange from which the call for said subscriber number has received and the plurality of exchanges from which a page response was received; and routing the call to the mobile station from which a page response was received which is geographically closest to the exchange from which the call for said subscriber number was received.
storing an algorithm for calculating the geographic relationships between exchanges from which calls for mobile subscriber number may be received and exchanges within which mobile stations associated with those numbers may be located;
calculating with said algorithm, in response to the receipt of a paging response indication with respect to more than one of said mobile stations, the respective distances between the exchange from which the call for said subscriber number has received and the plurality of exchanges from which a page response was received; and routing the call to the mobile station from which a page response was received which is geographically closest to the exchange from which the call for said subscriber number was received.
8. A method for providing extension phone service within a mobile radio communication system as set forth in claim 1 in which said database is maintained within a home location register associated with said subscriber number.
9. A method for providing extension phone service within a mobile radio communication system as set forth in claim 1 in which said routing request message is sent to a visited location register identified in said database.
10. A method for providing extension phone service within a mobile radio communication system as set forth in any of claims 1-9 in which said system is a cellular radio system and in which the location at which a call is received and from which said call is routed is an interrogation exchange.
11. A system for providing extension phone service within a mobile radio communication system, comprising:
means for associating a plurality of mobile stations, each having a unique identification, with a single subscriber number;
means for receiving a call directed to the subscriber number to which a plurality of mobile stations are associated;
means for maintaining in a database a list of parameters identifying each mobile station associated with said subscriber number and the exchange within which each of said mobile stations is currently believed to be located;
means for sending a routing request message to the location within which each mobile station is specified in the database as currently being located;
means for paging each mobile station in the location at which a routing request was received;
means for receiving an indication as to which ones of said mobile stations have responded to a page;
and means for selectively routing the call to one of the mobile stations as to which a page response was received.
means for associating a plurality of mobile stations, each having a unique identification, with a single subscriber number;
means for receiving a call directed to the subscriber number to which a plurality of mobile stations are associated;
means for maintaining in a database a list of parameters identifying each mobile station associated with said subscriber number and the exchange within which each of said mobile stations is currently believed to be located;
means for sending a routing request message to the location within which each mobile station is specified in the database as currently being located;
means for paging each mobile station in the location at which a routing request was received;
means for receiving an indication as to which ones of said mobile stations have responded to a page;
and means for selectively routing the call to one of the mobile stations as to which a page response was received.
12. A system for providing extension phone service within a mobile radio communication system as set forth in claim 11, wherein said page response indication receiving means comprises:
means for starting a timer for measuring a preselected time period after sending said routing request messages;
means for initiating recovery procedure in response to the failure to receive a page response indication within said preselected time period.
means for starting a timer for measuring a preselected time period after sending said routing request messages;
means for initiating recovery procedure in response to the failure to receive a page response indication within said preselected time period.
13. A system for providing extension phone service within a mobile radio communication system as set forth in claim 11, wherein said selective routing means comprises:
means for routing the call to only one of a plurality of mobile stations from which page responses were received, said one being selected in accordance with a set of preselected criteria.
means for routing the call to only one of a plurality of mobile stations from which page responses were received, said one being selected in accordance with a set of preselected criteria.
14. A system for providing extension phone service within a mobile radio communication system as set forth in claim 11, wherein said selective routing means comprises:
means for storing in a database a priority indication with respect to each of said mobile stations associated with said single subscriber number;
means for consulting said database in response to the receipt of a paging response indication with respect to more than one of said mobile stations; and means for routing the call to the mobile station having the highest priority among those from which a page response was received.
means for storing in a database a priority indication with respect to each of said mobile stations associated with said single subscriber number;
means for consulting said database in response to the receipt of a paging response indication with respect to more than one of said mobile stations; and means for routing the call to the mobile station having the highest priority among those from which a page response was received.
15. A system for providing extension phone service within a mobile radio communication system as set forth in claim 11, wherein said selective routing means comprises:
means for selectively routing the call to the first one of the mobile stations from which a page response was received.
means for selectively routing the call to the first one of the mobile stations from which a page response was received.
16. A system for providing extension phone service within a mobile radio communication system as set forth in claim 11, wherein said selective routing means comprises:
means for storing in a database a table of geographic relationships between exchanges from which calls for mobile subscriber numbers may be received and exchanges within which mobile stations associated with those numbers may be located;
means for consulting said table in response to the receipt of a paging response indication with respect to more than one of said mobile stations; and means for routing the call to the mobile station from which a page response was received which is geographically closest to the exchange from which the call for said subscriber number was received.
means for storing in a database a table of geographic relationships between exchanges from which calls for mobile subscriber numbers may be received and exchanges within which mobile stations associated with those numbers may be located;
means for consulting said table in response to the receipt of a paging response indication with respect to more than one of said mobile stations; and means for routing the call to the mobile station from which a page response was received which is geographically closest to the exchange from which the call for said subscriber number was received.
17. A system for providing extension phone service within a mobile radio communication system as set forth in claim 11, wherein said selective routing means comprises:
means for storing an algorithm for calculating the geographic relationships between exchanges from which calls for mobile subscriber numbers may be received and exchanges within which mobile stations associated with those numbers may be located;
means for calculating with said algorithm, in response to the receipt of a paging response indication with respect to more than one of said mobile stations, the respective distances between the exchange from which the call for said subscriber number was received and the plurality of exchanges from which a page response was received; and means for routing the call to the mobile station from which a page response was received which is geographically closest to the exchange from which the call for said subscriber number was received.
means for storing an algorithm for calculating the geographic relationships between exchanges from which calls for mobile subscriber numbers may be received and exchanges within which mobile stations associated with those numbers may be located;
means for calculating with said algorithm, in response to the receipt of a paging response indication with respect to more than one of said mobile stations, the respective distances between the exchange from which the call for said subscriber number was received and the plurality of exchanges from which a page response was received; and means for routing the call to the mobile station from which a page response was received which is geographically closest to the exchange from which the call for said subscriber number was received.
18. A system for providing extension phone service within a mobile radio communication system as set forth in claim 11 in which said database is maintained within a home location register associated with said subscriber number.
19. A system for providing extension phone service within a mobile radio communication system as set forth in claim 11 in which said routing request message is sent to a visited location register identified in said database.
20. A system for providing extension phone service within a mobile radio communication system as set forth in any of claims 11-19 in which said system is a cellular radio system and in which the location at which a call is received and from which said call is routed is an interrogation exchange.
21. A method for routing calls within a mobile radio communication system in which a single subscriber number may be associated with one or more mobile stations, each having a unique mobile identification number, said method comprising:
receiving at a location a location request message from an exchange indicative of a call to a subscriber having a single subscriber number;
determining whether or not there is more than one mobile station associated with said single subscriber number for which said location message was received;
completing said call to the mobile station in response to a determination that there if only one mobile station associated with said single subscriber number;
sending, in response to a determination that there is more that one mobile station identification number associated with said single subscriber number, a routing request message for each of said associated mobile station identification number to the current location at which said mobile station is believed to be located;
paging each mobile station identification number at said location in response to the receipt of a routing request message;
monitoring for a preselected period of time the receipt of page responses from each of said pages;
initiating a recovery procedure in response to failure to receive any page responses during said preselected period of time;
completing the call to the mobile station from which a page response is received in response to the receipt of only one page response;
making a call routing decision in response to the receipt of more than one page response from said paged mobile stations in accordance with predefined criteria; and routing said call from said exchange to one of said plurality of mobile stations in accordance with said call routing decision.
receiving at a location a location request message from an exchange indicative of a call to a subscriber having a single subscriber number;
determining whether or not there is more than one mobile station associated with said single subscriber number for which said location message was received;
completing said call to the mobile station in response to a determination that there if only one mobile station associated with said single subscriber number;
sending, in response to a determination that there is more that one mobile station identification number associated with said single subscriber number, a routing request message for each of said associated mobile station identification number to the current location at which said mobile station is believed to be located;
paging each mobile station identification number at said location in response to the receipt of a routing request message;
monitoring for a preselected period of time the receipt of page responses from each of said pages;
initiating a recovery procedure in response to failure to receive any page responses during said preselected period of time;
completing the call to the mobile station from which a page response is received in response to the receipt of only one page response;
making a call routing decision in response to the receipt of more than one page response from said paged mobile stations in accordance with predefined criteria; and routing said call from said exchange to one of said plurality of mobile stations in accordance with said call routing decision.
22. A method for routing calls within a mobile radio communication system in which a single subscriber number may be associated with one or more mobile stations, each having a unique mobile identification number, as set forth in claim 21 in which said step of making said call routing decision includes:
assigning priorities to each of said mobile stations associated with said single subscriber number;
and routing said call to the mobile station having the highest priority from which a page response was received.
assigning priorities to each of said mobile stations associated with said single subscriber number;
and routing said call to the mobile station having the highest priority from which a page response was received.
23. A method for routing calls within a mobile radio communication system in which a single subscriber number may be associated with one or more mobile stations, each having a unique mobile identification number, as set forth in claim 21 in which said step of making said call routing decision includes:
determining which one of said mobile stations from which a page response was received is closer to the calling party from which said call was received for said subscriber number; and routing said call to said mobile station.
determining which one of said mobile stations from which a page response was received is closer to the calling party from which said call was received for said subscriber number; and routing said call to said mobile station.
24. A method for routing calls within a mobile radio communication system as set forth in any of claims 21-23 in which said system is a cellular radio system and in which the location at which a call is received and from which said call is routed is an interrogation exchange.
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| US605793A | 1993-01-19 | 1993-01-19 | |
| US08/006,057 | 1993-01-19 |
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| US5699407A (en) * | 1993-01-19 | 1997-12-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system for implementing extension phone within a cellular radio telecommunications network |
| US5623535A (en) * | 1994-09-08 | 1997-04-22 | Lucent Technologies Inc. | Operations of cellular communications systems based on mobility and teletraffic statistics collected by mobile units |
| KR100219828B1 (en) * | 1995-01-06 | 1999-09-01 | 다치카와 게이지 | Packet transmitting system and mobile communication system |
| CN1090437C (en) * | 1995-04-04 | 2002-09-04 | 艾利森公司 | Mobile station user group operation |
| FI101508B (en) * | 1995-09-29 | 1998-06-30 | Nokia Mobile Phones Ltd | Cellular extension of the fixed communication network |
| US5806000A (en) * | 1995-10-12 | 1998-09-08 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method for implementing short message service extension phones within a radio telecommunications network |
| WO1997030558A1 (en) * | 1996-02-13 | 1997-08-21 | Kabushiki Kaisha Toshiba | Digital button telephone system and extension terminal for the same |
| US5884180A (en) * | 1996-10-30 | 1999-03-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Method of providing a delayed connection announcement to a mobile subscriber within a radio telecommunication system |
| US5943620A (en) * | 1996-12-09 | 1999-08-24 | Ericsson Inc. | Method for associating one directory number with two mobile stations within a mobile telecommunications network |
| US6393275B1 (en) | 1996-12-27 | 2002-05-21 | At&T Corp. | Cellular extension service using single line and multiple cellular telephone sets |
| FI105872B (en) | 1997-08-28 | 2000-10-13 | Nokia Mobile Phones Ltd | Procedures and systems for conveying messages |
| FI974590A0 (en) * | 1997-12-22 | 1997-12-22 | Finland Telecom Oy | Viabestaemningsfoerfarande och- system |
| DE69934498T2 (en) * | 1998-09-01 | 2007-11-15 | British Telecommunications P.L.C. | HOME ZONE EXTENSION PHONE SERVICE |
| ES2228308T3 (en) * | 1999-01-22 | 2005-04-16 | Siemens Aktiengesellschaft | PROCEDURE FOR TELEPHONY NETWORK AND PROCEDURE FOR THE CONTROL OF THE REACH OF TERMINAL DEVICES OF A MOBILE TELEPHONY NETWORK. |
| US6671515B1 (en) * | 2000-06-06 | 2003-12-30 | Motorola, Inc. | Method and apparatus for selecting communication cells in a wireless communication system |
| US6829341B2 (en) | 2001-03-21 | 2004-12-07 | Telefonaktiebolaget Lm Ericsson | Method for managing a plurality of extension communication units |
| MXPA04009342A (en) * | 2002-03-27 | 2005-09-12 | Cellcom Israel Ltd | System and method for sharing cellular communication services among mobile stations of different networks. |
| IL148926A (en) | 2002-03-27 | 2007-07-24 | Cellcom Israel Ltd | System and method for sharing cellular communication services among mobile stations of different networks |
| JP4412456B2 (en) * | 2003-10-09 | 2010-02-10 | 日本電気株式会社 | Mobile communication system |
| DE102004007856B4 (en) * | 2003-11-11 | 2011-02-24 | T-Mobile Deutschland Gmbh | Method for controlling the delivery of messages in a telecommunication network with special consideration of the multi-device configurations |
| WO2005048622A1 (en) * | 2003-11-11 | 2005-05-26 | T-Mobile Deutschland Gmbh | Method for controlling the delivery of messages in a telecommunications network while taking multi-device configurations into special consideration |
| DE102006025979A1 (en) * | 2006-06-02 | 2007-12-06 | Siemens Ag | Cellular network addressing method, involves assigning common group address to set of terminals, and performing addressing to terminals during addressing of connection requests to group address |
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| DE3939903A1 (en) * | 1989-12-02 | 1991-06-06 | Licentia Gmbh | RADIO SYSTEM |
| FI91340B (en) * | 1991-07-24 | 1994-02-28 | Posti Ja Telelaitos Tele Matka | System for using a mobile telephone network |
| US5206901A (en) * | 1991-12-23 | 1993-04-27 | At&T Bell Laboratories | Method and apparatus for alerting multiple telephones for an incoming call |
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1994
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- 1994-01-19 NZ NZ259957A patent/NZ259957A/en unknown
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- 1994-01-19 CA CA002129666A patent/CA2129666A1/en not_active Abandoned
- 1994-01-19 AU AU58951/94A patent/AU673411B2/en not_active Ceased
- 1994-01-19 WO PCT/SE1994/000035 patent/WO1994017644A1/en active Application Filing
- 1994-01-19 MY MYPI94000146A patent/MY113958A/en unknown
- 1994-01-19 GB GB9416168A patent/GB2278759B/en not_active Expired - Fee Related
- 1994-01-19 JP JP6516917A patent/JPH08502870A/en not_active Ceased
- 1994-01-19 KR KR1019940703178A patent/KR100310194B1/en not_active IP Right Cessation
-
1998
- 1998-06-17 HK HK98105589A patent/HK1006626A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2278759B (en) | 1996-11-06 |
| KR100310194B1 (en) | 2001-12-15 |
| GB2278759A (en) | 1994-12-07 |
| TW245866B (en) | 1995-04-21 |
| KR950700674A (en) | 1995-01-16 |
| AU5895194A (en) | 1994-08-15 |
| SG45230A1 (en) | 1998-01-16 |
| JPH08502870A (en) | 1996-03-26 |
| NZ259957A (en) | 1996-09-25 |
| MY113958A (en) | 2002-07-31 |
| CN1059772C (en) | 2000-12-20 |
| CN1101492A (en) | 1995-04-12 |
| BR9403766A (en) | 1999-06-15 |
| GB9416168D0 (en) | 1994-10-05 |
| AU673411B2 (en) | 1996-11-07 |
| HK1006626A1 (en) | 1999-03-05 |
| WO1994017644A1 (en) | 1994-08-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20040705 |