WO2001045449A1 - Procede de recherche de station mobile (sm) via un reseau de communication sans fil - Google Patents

Procede de recherche de station mobile (sm) via un reseau de communication sans fil Download PDF

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Publication number
WO2001045449A1
WO2001045449A1 PCT/US2000/033688 US0033688W WO0145449A1 WO 2001045449 A1 WO2001045449 A1 WO 2001045449A1 US 0033688 W US0033688 W US 0033688W WO 0145449 A1 WO0145449 A1 WO 0145449A1
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WO
WIPO (PCT)
Prior art keywords
paging signal
cells
paging
contiguous
communications network
Prior art date
Application number
PCT/US2000/033688
Other languages
English (en)
Inventor
Jila Seraj
Original Assignee
Ericsson Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Inc. filed Critical Ericsson Inc.
Priority to AU19596/01A priority Critical patent/AU1959601A/en
Publication of WO2001045449A1 publication Critical patent/WO2001045449A1/fr

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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
    • H04W68/08—User notification, e.g. alerting and paging, for incoming communication, change of service or the like using multi-step notification by increasing the notification area

Definitions

  • the present invention is directed, in general, to wireless communications systems and, more specifically, to methods for paging a Mobile Station (MS) through a wireless communications network
  • MS Mobile Station
  • the geographical service area is divided into areas commonly referred to as "cells " In order to locate a Mobile Station (MS) traveling within the geographical service area, a paging signal must be sent to the MS
  • a Location Area which is an arbitrary collection of cells, is the smallest area in which a paging signal is transmitted. If the size of, or number of cells in, an LA is too small, however, the frequency of MS registrations will increase, and the probability of locating an MS while paging within the LA will decrease. If the size of, or number of cells in, an LA is too large, however, the network will transmit the paging signal in an area much larger than necessary, resulting in inefficient use of system resources.
  • paging area a conventional paging area is a combination of LA's, and an LA should not be too small, the transmission of a paging signal throughout a conventional PA can be very inefficient.
  • the present invention relates to a method for paging a mobile station (MS) through a wireless communications network.
  • the wireless communications network includes at least a first location area (LA) and a second LA, wherein each of the LA's includes a plurality of cells.
  • the method includes the steps of: 1) transmitting a first paging signal within the first LA; and 2) if the MS fails to answer the first paging signal, transmitting a second paging signal within the first LA and within a portion of the second LA consisting of cells contiguous to the first LA.
  • the method further includes the step of transmitting a third paging signal within the first LA, within the portion of the second LA consisting of cells contiguous to the first LA, and within a second portion of the second LA consisting of cells contiguous to the cells contiguous to the first LA
  • the method can further include the step of transmitting the second paging signal within a portion of the third LA consisting of cells contiguous to the first LA.
  • the method can further include the step of transmitting a third paging signal within the first LA, within the portion of the third LA consisting of cells contiguous to the first LA, and within a second portion of the third LA consisting of cells contiguous to the cells contiguous to the first LA
  • the first LA and a second LA can be within a geographical service area associated with a single Mobile- Services Switching Center (MSC) In other locations, the first LA is within a geographical service area associated with a first Mobile-Services Switching Center (MSC) and the second LA is within a geographical service area associated with a second MSC In addition, the first LA can be within a geographical service area associated with a first Base Station Controller (BSC) and the second LA can be within a geographical service area associated with a second BSC
  • MSC Mobile- Services Switching Center
  • BSC Base Station Controller
  • a “Mobile Station (MS)” is defined to include any mobile wireless communications device, including, without limitation, mobile telephony, computing, and paging devices
  • wireless communications network is defined to include any type of network that provides wireless communications to mobile telephony, computing or paging devices, such networks can include a wireless local area network (LAN) or wide area network (WAN), and public or private cellular communications networks, such as a Global Services for Mobile (GSM) communications network
  • LAN wireless local area network
  • WAN wide area network
  • GSM Global Services for Mobile
  • the method can be implemented in a GSM communications network including at least one Mobile-services Switching Center (MSC) having an associated geographical service area including at least a first location area (LA) comprising a plurality of cells, and a Base Station Controller (BSC) coupled to the MSC
  • MSC Mobile-services Switching Center
  • LA first location area
  • BSC Base Station Controller
  • the BSC is associated with a Base Transceiver Station (BTS) in each of the plurality of cells in the first LA.
  • BTS Base Transceiver Station
  • the MSC and the BSC are adapted to cause a Mobile Station (MS) paging signal to be transmitted by a BTS within each of the plurality of cells in the first LA and, if no response is received to the MS paging signal, cause a second MS paging signal to be transmitted by a BTS within each of the plurality of cells in the first LA and by a BTS within each cell contiguous to the first LA and within a second LA.
  • MS Mobile Station
  • a third MS paging signal can be transmitted by a BTS within each of the plurality of cells in the first LA, by a BTS within each cell contiguous to the first LA and within a second LA, and by a BTS within each cell in the second LA contiguous to the cells contiguous to the first LA.
  • the second MS paging signal can be further transmitted by a BTS within each cell contiguous to the first LA and within the third LA.
  • a third MS paging signal can be transmitted by a BTS within each of the plurality of cells in the first LA, by a BTS within each cell contiguous to the first LA and within the third LA, and by a BTS within each cell in the third LA contiguous to the cells within the third LA contiguous to the first LA.
  • the second LA can be within a geographical service area associated with a second BSC, and the second BSC can be associated with a second MSC.
  • the third LA can be within a geographical service area associated with the first, or a second or third BSC, and the second or third BSC can be associated with a second or third MSC.
  • FIGURE 1 illustrates a prior art paging area (PA) architecture
  • FIGURE 2 illustrates the general principles of a PA architecture according to the principles of the present invention
  • FIGURE 3 illustrates additional aspects of a PA architecture in accordance with the principles of the present invention.
  • FIGURE 4 illustrates a flowchart of an exemplary method of paging an MS according to the principles of the present invention.
  • a prior art paging area (PA) architecture As previously described, the geographical service area of a conventional wireless communications network 100 is divided into areas commonly referred to as "cells " In order to locate a Mobile Station (MS) traveling within the geographical service area, a paging signal must be sent to the MS.
  • a Location Area (LA) which is an arbitrary collection of cells, is the smallest area in which a paging signal is transmitted
  • the wireless communications network 100 has been subdivided into location areas OlLAl, 01LA2, 01LA3, 01LA4, 02LA1, 02LA2, and 02LA3.
  • the location area designations include a reference to the Mobile-service Switching Center (MSC) associated with the LA and the identity of the LA within the geographical service area of the MSC.
  • MSC Mobile-service Switching Center
  • the location area OlLAl is LA “1" for MSC 01
  • location area 02LA2 is LA “2" for MSC 02
  • a first paging signal to that MS would be transmitted within each cell in that LA. If the paging attempt in location area OlLAl is unsuccessful, a second paging signal is transmitted within location area OlLAl and within each neighboring location area; e.g., location areas 01LA2, 01LA3, 01LA4, 02LA1, 02LA2, and 02LA3. Similarly, if a first paging signal is transmitted within location area 01LA3, a second paging signal, if necessary, would be transmitted in the neighboring location areas 01LA2, OlLAl, and 01LA4.
  • the geographical size of an LA can be quite large, it is typically unlikely that an MS will travel very far within an LA prior to the network updating the location of the MS. Therefore, if a paging signal must be sent to an MS between the time an MS leaves a first LA and registers its location within a second LA, it is inefficient to send the paging signal to every cell in the second LA since the MS is most likely within a cell contiguous to the first LA.
  • the principles of the present invention recognize this, and provide methods to increase the probability of locating an MS while simultaneously reducing the number of cells in which a paging signal for the MS is transmitted.
  • the wireless communications network 200 illustrated in FIGURE 2 includes the same location areas as illustrated in FIGURE 1.
  • the network 200 employs a novel scheme of defining paging areas.
  • an MS has last registered with the network while located in location area OlLAl, an initial paging signal for that MS would be transmitted within each cell in that location area.
  • a first paging area PAi for an MS last registered in location area OlLAl includes all cells within that location area.
  • a second paging signal is transmitted within PAj and within a portion of each neighboring LA consisting of cells contiguous to PAi.
  • a second paging area PA 2 includes all cells within PA, plus the cells within locations areas 01LA2, 01LA3, 01LA4, 02LA1, 02LA2 and 02LA3 immediately adjacent, or contiguous, to PA L
  • a third paging signal can be transmitted within PA 2 and within a portion of each neighboring LA consisting of cells contiguous to PA 2
  • a third paging area PA ⁇ includes all cells within PA 2 plus the cells within location areas 01LA2, 01LA3, 01LA4, 02LA1, 02LA2 and 02LA3 immediately adjacent, or contiguous, to PA 2
  • a paging scheme in accordance with the principles of the present invention can be expanded to provide as many paging attempts as desired In particular, the maximum number of paging attempts can be independently defined for each paging attempts.
  • an LA and its neighboring LA's can all be within a geographical service area associated with a single Mobile-services Switching Center (MSC) In other locations, however, one or more neighboring LA's can be within a geographical service area of a second MSC In addition, an LA can be within a geographical service area associated with a first Base Station Controller (BSC) and one or more neighboring LA's can be within a geographical service area associated with a second BSC
  • BSC Base Station Controller
  • the principles of the present invention area are adaptable to all such network locations, as illustrated in FIGURE 3
  • the wireless communications network 300 which can be a Global Services for
  • GSM Global System for Mobile communications network
  • MSC Mobile
  • BSC's Base Station Controllers
  • the network 300 further includes an MSC 301 associated with BSC 31 1 Within the geographical service area of MSC 302, BSC 312-A is associated with a Base Transceiver Station (BTS) (not shown) in each cell within location area 02LA1, and BSC 312-B is associated with a BTS in each cell within location area 02LA2
  • BSC 31 1 is associated with a BTS in each cell within location areas OlLAl, 01LA2 and 01LA3
  • a first paging signal would be transmitted by a BTS within each cell of location area OlLAl (also referenced as paging area PAi) If the paging attempt in PA- is unsuccessful, a second paging signal is transmitted within PA] and within a portion of each neighboring LA consisting of cells contiguous to PA] For example, as shown in FIGURE 3, a second paging area PA 2 includes all cells within PA] plus the cells within location areas 01LA2, 01LA3, 02LA1 and 02LA2 immediately adjacent, or contiguous, to PA!
  • a third paging signal can be transmitted within PA 2 and within a portion of each neighboring LA consisting of cells contiguous to PA 2
  • a third paging area PAn includes all cells within PA 2 plus the cells within location areas 01LA2, 01LA3, 02LA1 and 02LA2 immediately adjacent, or contiguous, to PA 2
  • Step 400 a first paging signal is transmitted within a first LA (or paging area), the first LA is preferably the LA in which the MS being paged last registered its location
  • Step 420 it is determined whether the MS answered the first page, if so, communications with the MS are established (Step 430) using conventional protocols known to those skilled in the art
  • a second paging signal is transmitted within the first LA (or PA) and within a portion of a second LA consisting of cells contiguous to the first LA (Step 440)
  • the second paging signal can be also transmitted within a first portion of a third LA (and additional LA's) having cells contiguous to the first LA
  • Step 450 it is determined whether the MS answered the second page, if so, communications with the MS are established (Step 440) If the MS does not answer the second page,
  • the present invention provides significant advantages to wireless communications systems
  • the principles disclosed herein are more efficient methods of paging an MS in a wireless communications network than those known in the existing body of art, thereby minimizing the inefficient use of system resources and increasing the probability of locating an MS
  • the principles are readily adaptable to implementation in both conventional and novel wireless communications network architectures

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

Abstract

L'invention concerne un procédé de recherche de station mobile (MS) via un réseau de communication sans fil. Ce réseau de communication sans fil comprend au moins une première zone de localisation (LA) et une seconde LA, chacune de ces LA comportant une pluralité de cellules. Dans un mode de réalisation exemplaire, ledit procédé consiste (1) à émettre un premier signal de recherche d'abonné dans la première LA, et (2) à émettre, si la SM ne parvient pas à répondre au premier signal de recherche d'abonné, un deuxième signal de recherche d'abonné dans la première LA et dans une partie de la seconde LA constituée de cellules voisines de la première LA. Dans un mode de réalisation associé, si la SM ne parvient pas à répondre au deuxième signal de recherche d'abonné, le procédé consiste alors à émettre un troisième signal de recherche d'abonné dans la première LA, dans la partie de la seconde LA constituée de cellules voidines de la première LA, et dans une seconde partie de la seconde LA constituée de cellules adjacentes aux cellules voisines de la première LA. Si nécessaire, des signaux de recherche de SM supplémentaires peuvent être transmis dans des cellules additionnelles s'étendant vers l'extérieur à partir de la première LA.
PCT/US2000/033688 1999-12-16 2000-12-12 Procede de recherche de station mobile (sm) via un reseau de communication sans fil WO2001045449A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU19596/01A AU1959601A (en) 1999-12-16 2000-12-12 Method for paging a mobile station (ms) through a wireless communications network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46544399A 1999-12-16 1999-12-16
US09/465,443 1999-12-16

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Publication Number Publication Date
WO2001045449A1 true WO2001045449A1 (fr) 2001-06-21

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1568239A2 (fr) * 2002-11-19 2005-08-31 QUALCOMM Incorporated Procede et dispositif de radiomessagerie et d'enregistrement efficaces dans un reseau de communication sans fil
US8712446B2 (en) 2007-08-09 2014-04-29 Motorola Mobility Llc Method and apparatus for optimizing paging in a communication network
EP3481116A1 (fr) * 2017-11-03 2019-05-08 Telefónica Germany GmbH & Co. OHG Procédé, système et dispositif de pagination d'un terminal mobile dans un réseau cellulaire mobile

Citations (3)

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Publication number Priority date Publication date Assignee Title
CA2219566A1 (fr) * 1996-12-24 1998-06-24 Lucent Technologies Inc. Amelioration des recherches basees sur la localisation pour les telephones mobiles
CA2219839A1 (fr) * 1996-12-24 1998-06-24 Lucent Technologies Inc. Recherches basees sur le temps ecoule pour les telephones mobiles
WO1998036603A2 (fr) * 1997-02-18 1998-08-20 Telefonaktiebolaget Lm Ericsson (Publ) Appareil et procede permettant la selection adaptative d'une zone de radiomessagerie dans laquelle joindre un terminal mobile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2219566A1 (fr) * 1996-12-24 1998-06-24 Lucent Technologies Inc. Amelioration des recherches basees sur la localisation pour les telephones mobiles
CA2219839A1 (fr) * 1996-12-24 1998-06-24 Lucent Technologies Inc. Recherches basees sur le temps ecoule pour les telephones mobiles
US6023624A (en) * 1996-12-24 2000-02-08 Lucent Technologies Inc. Location based paging for mobile telephone units
US6035203A (en) * 1996-12-24 2000-03-07 Lucent Technologies Inc. Time based paging for mobile telephone units
WO1998036603A2 (fr) * 1997-02-18 1998-08-20 Telefonaktiebolaget Lm Ericsson (Publ) Appareil et procede permettant la selection adaptative d'une zone de radiomessagerie dans laquelle joindre un terminal mobile

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Title
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HO J S M ET AL: "MOBILE USER LOCATION UPDATE AND PAGING UNDER DELAY CONSTRAINTS", WIRELESS NETWORKS,US,ACM, vol. 1, no. 4, 1 December 1995 (1995-12-01), pages 413 - 425, XP000543507, ISSN: 1022-0038 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1568239A2 (fr) * 2002-11-19 2005-08-31 QUALCOMM Incorporated Procede et dispositif de radiomessagerie et d'enregistrement efficaces dans un reseau de communication sans fil
EP1568239A4 (fr) * 2002-11-19 2009-12-02 Qualcomm Inc Procede et dispositif de radiomessagerie et d'enregistrement efficaces dans un reseau de communication sans fil
US8712446B2 (en) 2007-08-09 2014-04-29 Motorola Mobility Llc Method and apparatus for optimizing paging in a communication network
EP3481116A1 (fr) * 2017-11-03 2019-05-08 Telefónica Germany GmbH & Co. OHG Procédé, système et dispositif de pagination d'un terminal mobile dans un réseau cellulaire mobile

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