Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate
1998-08-17
2001-02-27
Hudspeth, David R. (Department: 2741)
Telephonic communications
Supervisory or control line signaling
Substation originated
Reexamination Certificate
active
06195427
ABSTRACT:
BACKGROUND
The invention relates to a method and a system for detecting the state of dialling a codenumber. Especially the invention relates to a method and a system in the environment of number analysis relating to dialling in the environment of cellular telecommunication or intelligent networks.
In the prior art U.S. Pat. No. 4,658,096 there is described an interfacing system for interfacing a standard telephone set with a wireless telephone set with a wireless radio transceiver. The system automatically determines when the last digit has been dialled to thus provide a send signal for ultimate transmission. To determine when the last digit of a telephone number has been dialled, the system looks at various initial digits of the telephone number if a 0 or 1 is located in the first few digits. It has to been taken into consideration that a US system is described where the numbers to be dialled are different to European numbers. A logical analysis is conducted from this information. The logical analysis determining for example a 0 at the first digit position leads to assuming that a long distance call will be performed and then seven digits are allowed. Another 0 at the following digits position leads to assuming that an out of area call will be done and a total of 11 (eleven) digits are allowed until a so called SEND code is sent. If an international call is assumed, a SEND code is generated when three seconds gap occurs after a digit is dialled without any minimum number of digits to be dialled, because no exact number of digits to be dialled can be assumed. If no SEND code is sent after three seconds the system counts until 7 digits are dialled and waits for the send code then or if then again no send code is sent, a total of 11 digits are assumed and the system waits for them to occur. This system leads to complicated and time consuming method, because a relatively advanced logic has to be incorporated with an precise analyse of the dialled number and the system always requests the SEND code to start launching of a query which implies. This system further can only be used in the environment of telephony. In, e.g. an intelligent network environment where the length of number and the style of number are not fixed the analysis is not possible.
SUMMARY
It is an object of the present invention to provide a method and a system for detecting the state of dialling a codenumber, which implies a low signalling load and a low delay in call set-up.
The invention is advantageous because a complete codenumber is likely to have been collected until a query is launched, which leads to a low signalling load due to the fact that the codenumber is sent in one go. The invention further leads advantageously to a low delay in call set-up. When a call should be set-up, a timer with a long time period causes a high delay when the codenumber is finally dialled due to the fact that the timer period is the minimum time it has to be waiting for. Such a time may be too long and may lead to an unacceptable waiting timer for a user who wishes to have a connection as soon as possible after finishing dialling. On the other hand if the timer's time period is too short this may lead, depending on the dialling speed to an unsuccessful set up of a call.
It is further advantageous that an analysis of the codenumber of dialled digits is performed. The analysis leads to a minimum number of digits to be dialled and after this number of digits is reached a timer starts. This leads to a better estimation of the number of digits, which have to be dialled in minimum, and therefore a low delay of call set-up is reached.
It is advantageous that the time period of the timer is determined depending on the average dialling speed of a dialler. Depending on different circumstances a dialler dials quicker or slower. Further the dialling speed is also depending on the person dialling. Therefore it is advantageous to have a short time period for people dialling quickly and to have a longer time period for people dialling slower.
Therefore any dialler has its individual time period and therefore the delay of call set up is also depending on it.
It is advantageous to define a maximum number of digits to be dialled. If the maximum number of digits is reached before the timer expired the query can be initialised directly without waiting. This further leads to a low delay of call set-up.
A timer can be fixed to different time periods wherein the results in a trigger timer and an event timer. It is a matter of fact that a dialler dials the first digits quicker than the last digits. According to this claim this can be solved easily and leads to a more personalised structure depending on the user need and leading to low delay for call set-up.
It is advantageous to have two different timers, out of which one is a trigger timer and one is an event timer. The trigger timer and the event timer may be determined by measuring the average time period between dialling two digits, and setting the time period of the timer to a value slightly longer than the average time. One or both of the timer can also be set to a fixed value. Therefore it may appear that either the event timer is set to a time period shorter, longer or equal to a time period of the trigger timer.
It may be advantageous to have an indication for unknown number length. In this case the numbers of digits to be dialled shouldn't be fixed to a special value, but it should be open how large this number is. This can be indicated by using a prefix or even not fixing the numbers.
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Bern Sara
Hansen Flemming
Burns Doane Swecker & Mathis L.L.P.
Hudspeth David R.
Telefonaktiebolaget LM Ericsson (publ)
Wieland Susan
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