Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1994-03-31
1995-12-26
Bost, Dwayne D.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379 60, 455 331, 455 332, H04Q 734
Patent
active
054794811
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for updating subscriber data in a cellular radio system, wherein a visitor location register receives from a home location register of the cellular radio system a home location register restart indication indicating that the home location register has restarted, and to a cellular radio system comprising a subscriber data list containing subscriber data.
Various cellular radio or mobile telephone systems are today used or being developed in which the geographical area covered by the system is divided into smaller separate radio areas or cells, so that when a radio telephone or mobile radio resides in a cell, it communicates with the fixed network through a fixed radio station located in the cell. The mobile radios belonging to the system are allowed to roam freely within the area of the system from one cell to another. Such systems include the digital mobile radio system GSM (Global System for Mobiles).
As is well-known in cellular radio networks, the home location register (HLR) continuously stores the location and subscriber data of mobile radios registered in the network in a memory means, such as a RAM, which data are lost e.g. when the HLR is switched off; and at regular intervals in a non-volatile memory means, such as a hard disk, where the data are stored permanently. When the HLR occasionally has to restart, the location and subscriber data stored in the volatile memory are lost. In such a case, the HLR has to request all visitor location registers (VLR) of the mobile radio network to perform the location updating of the subscribers of the respective HLR in order that the HLR would know the location data of its subscribers. The HLR needs the subscriber location data so as to be able to give the right location of the subscriber to a mobile exchange wanting to forward a call to this particular subscriber. In a prior art solution described in GSM 03.08, February 1992, Organisation of Subscriber Data, ETSI/PT 12, the following subscriber-specific data, among others, are stored in the VLR (Table 1 of the above specification): IMSI (International Mobile Subscriber Number, subscriber-specific Radio Confirmation Indicator, described in greater detail in Section 2.7.2.1. of the above specification, HLR Confirmation Indicator, described in greater detail in Section 2.7.2.2., and the HLR address of the subscriber. In this prior art solution the HLR indicates all VLRs in the radio network that it has restarted, which is described in GSM 09.02, January 1991, Mobile Application Part Specification DCS, ETSI, Version 3.8.0, FIG. 6.2/9. All VLRs in the cellular radio system that have received the restart indication thereby start to search their own subscriber-specific subscriber and location data lists for the data of the subscribers of the HLR which has sent the restart indication. When the VLR finds the data of the searched subscribers, it sets the Radio Confirmation Indicator and HLR Confirmation Indicator in the subscriber data of these subscribers to a not confirmed state. After the VLR succeeds in establishing a radio connection with a certain subscriber residing in the service area of the VLR, the VLR sets the Radio Confirmation Indicator of this subscriber to a confirmed state. Correspondingly, when the VLR succeeds in updating the location of a certain subscriber (typically as described in GSM 03.12, February 1992, Location Registration Procedures DCS, ETSI/PT 12, Section 5.4.2.1.), the VLR sets the HLR Confirmation Indicator of this subscriber to a confirmed state. This is described in greater detail in GSM 09.02, January 1991, Mobile Application Part Specification DCS, ETSI, Section 5.8.4., p. 275.
A drawback of the prior art solution is that after the HLR has sent the restart indication to the VLRs of the cellular radio system, all VLRs that have received the indication have to check all of the subscriber data stored in them and compare their HLR address with the address of the HLR which sent the restart indication. If the addresses are identical, the VLRs further have
REFERENCES:
patent: 5123111 (1992-06-01), Delory et al.
"European digital cellular telecommunication system (phase 1); Organization of Subscriber Data", published by European Telecommunications Standards Institute, GSM 03.08, version 3.7.0, Jan. 1991, pp. 1-18.
"Procedures during restoration", GSM 03.07--version 3.2.1, Feb. 1992, pp. 7-10.
"European digital cellular telecommunications system (phase 1); Location Registration Procedures", published by European Telecommunications Standards Institute, GSM 03.12, version 3.3.0, Jun. 1994, pp. 1-9.
"Recommendation GSM 09.02 Mobile Application Part Specification", Jan. 1991, version 3.8.0, pp. 25, 27-29, 35-39, 41, 271-280 and 420.
WO, A1, 9222174 (Telenokia Oy et al.), 11 Dec. 1992, see the whole document.
WO, A1, 8808238 (Motorola Inc), 20 Oct. 1988 p. 3, line 30--p. 5, line 13.
Electrical Communication, 63 (1989): 4, W. Weiss et al, "System 900: The ISDN Approach to Cellular Mobile Radio" pp. 400-408; see the whole document.
Bost Dwayne D.
Nokia Telecommunications
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