Telecommunications – Transmitter and receiver at separate stations
Patent
1995-05-09
1997-10-28
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
379 58, 379 63, 455 582, H04Q 700
Patent
active
056826001
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for starting a short message transmission in a cellular radio network, a corresponding cellular radio network and a subscriber register for a cellular radio network, in which method the subscriber register stores information on the fact that at least one short message service centre holds short messages for transmission to a subscriber that is not reachable, and when the subscriber requests process access to the cellular radio network, or when the subscriber data of the subscriber are location updated, the subscriber register of the subscriber sends a short message transmission start message to the at least one short message service centre.
BACKGROUND OF THE INVENTION
In connection with cellular radio networks, it is known to send short messages through a short message service centre (SC) separate from the cellular radio network. One specification for a system sending and relaying short messages is provided in the ETSI GSM system recommendation "GSM 03.40, February 1992, Technical Realisation of the Short Message Service Point-to-Point, ETSI/PT". This recommendation describes the connection of an SC to a GSM Mobile Services Switching Centre and the operation of the SC in connection with sending and relaying short messages originating outside the cellular radio network and from a subscriber in the cellular radio network (A subscriber) to another subscriber in the network (B subscriber) or to an external data transmission means capable of receiving and/or sending short messages.
When an SC attempts to send a short message to a B subscriber and the B subscriber cannot be reached, a list of waiting messages in accordance with the GSM recommendation 03.40 is set up in the home location register (HLR), for B subscriber-specific storing of addresses of SCs holding short messages for delivery to the B subscriber. Thus, when the B subscriber accesses the network, that is, when a short message can be delivered to the mobile phone of the B subscriber, the visitor location register (VLR) in whose service area the B subscriber is registered sends information on the arrival of the B subscriber in the network to the HLR of the B subscriber. Thereupon, the HLR, or subscriber register, of the B subscriber starts transmitting Alert messages to the SCs specified in the Message Waiting Data List of the given subscriber; the Alert messages signal the SCs that the B subscriber has become active within the service area of the cellular radio network and that it is worth-while attempting to send a short message to the mobile phone of the B subscriber. This kind of situation can arise, for example, when the subscriber has switched off his or her mobile phone for the night and switches it on in the morning, or respectively if the subscriber uses a mobile phone in work and switches his or her mobile phone on when his or her working hours begin. If a plurality of Alert messages arrive in a single SC, the SC may become overloaded and unable to deliver short messages to subscribers. If the SC is not overloaded, the Alert messages initiate short message transmission for the B subscriber from the SCs through the cellular radio system to the B subscriber. The short messages are stored in the SC according to the Mobile Station International PSTN/ISDN number (MSISDN) of the B subscriber; yet the SC does not recognize the different MSISDN numbers as belonging to the same subscriber, but can simultaneously initiate sending of several short messages to the same B subscriber. Likewise, if several SCs having access to the cellular radio network are attempting to send substantially simultaneously short messages to the same B subscriber, the MSC with which the VLR is integrated cannot send the short messages that have arrived after the previous short message, but must send a negative acknowledgement to the SC. Thus, collision of short messages in the MSC results in sending of negative signalling messages to the SC through the cellular radio network. In that situation, the SC will
REFERENCES:
patent: 4677613 (1987-06-01), Salmond et al.
Recommendation GSM 03.40 "Technical Realization of the Short Message Service--Point-to-Point" Feb. 1992; see p. 13 (paragraph 3.2.6)--p. 14 (paragraph 3.2.7).
Release Note, Recommendation GSM 01.02, General Description of a GSM PLMN Mar. 1990.
ETSI/GSM, Apr. 9, 1990, Source: GSM/PT12, Report GSM 11.30, Mobile Services Switching Centre Version 3.2.1.
Armstrong Darnell R.
Eisenzopf Reinhard J.
Nokia Telecommunications Oy
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