Telecommunications – Radiotelephone system – Including private cordless extension system
Reexamination Certificate
1996-03-26
2001-12-04
Legree, Tracy (Department: 2681)
Telecommunications
Radiotelephone system
Including private cordless extension system
C455S463000, C455S416000, C455S415000
Reexamination Certificate
active
06327477
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a wireless control apparatus wirelessly connected to a wireless communication apparatus, as well as to a system comprising the wireless communication apparatus and the wireless control apparatus.
2. Description of the Related Art
A wireless communication system known in the art comprises a wireless control apparatus (master) and a wireless communication apparatus (slave) wirelessly connected to the wireless control apparatus.
When a transmission request is issued from the slave side or an incoming call is terminated at the slave side in a wireless communication system of this kind, the master searches for and decides upon the communication channel used in this communication between the master and slave and so notifies the slave using a control channel, whereupon the slave is shifted to the communication channel of which it has been notified, thereby establishing a wireless link.
When communication ends, control for the purpose of cutting off the wireless link is carried out over a prescribed period of time, whereupon the wireless link is cut.
However, when an incoming call to the slave is detected after communication ends, the wireless link is cut temporarily. This is despite the fact that the wireless link has not been cut through the link cutting control operation because this operation is still in progress. This means that a new control channel is temporarily occupied to search for and decide upon an idle communication channel and establish a wireless link anew, whereupon communication commences. This procedure takes time. Moreover, if the wireless link cannot be established the second time, it may not be possible to perform communication in response to the incoming call.
Further, in order to make all slaves ring at the time of an incoming call from a communication line in a situation where a plurality of slaves exist, wireless links are established to all of the slaves. If an outgoing call is then abandoned by disconnection on the calling side, the wireless links to the slaves are cut. Or, if a slave responds to the incoming call, the wireless links to slaves other than the responding slave are disconnected.
Accordingly, if a party not sought by the calling side answers the incoming call, it is required that the call be transferred. When the transfer is made, the slave that is the destination of the transfer must re-establish the wireless link and the calling party is made to wait until this is achieved.
In particular, when there is an incoming call from another outside line or an outgoing call to a communication apparatus of another extension in the case of communication apparatus or private branch exchange accommodating a plurality of communication lines (outside lines) and also having a number of extensions, there are instances where a procedure for establishing a wireless link with the other communication apparatus is made to wait while a procedure for establishing a wireless link is being executed for the incoming call or outgoing call. It may take several seconds or more before the communication apparatus that is the destination of the transfer answers or before there is a hold response made by the other communication apparatus. The result is poor operability.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to eliminate the troublesome task of re-establishing a wireless link and use an already established wireless link as is in a case where an incoming call arrives at a wireless communication terminal after the end of communication, thereby making it possible to start communication rapidly without occupying a control channel for a fixed period of time for the purpose of establishing the wireless link.
Another object of the present invention is to maintain a wireless link for a period of time longer than that required to disconnect the wireless link after communication ends.
A further object of the present invention is to provide a wireless communication system in which, in an instance where a calling party receives a response from a party different from the intended party after the incoming call from a public telephone line is terminated and answered, as is often the case where a hold-and-transfer operation is used most frequently, the operation for effecting transfer to another communication terminal or for holding and answering at another communication terminal is facilitated.
Still another object of the present invention is to make it possible to adjust the time needed to disconnect a wireless link after communication ends.
Still another object of the present invention is to make it possible to adjust the time needed to disconnect the wireless link of a communication terminal other than a communication terminal that has responded to an incoming call, the purpose being to achieve a speedy transfer to the other communication terminal after an incoming call from a telephone line to a plurality of wireless communication terminals is terminated and answered or to achieve a prompt holding response at the other communication terminal.
Other features and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof.
REFERENCES:
patent: 4682367 (1987-07-01), Childress et al.
patent: 4989231 (1991-01-01), Ishikawa
patent: 5159702 (1992-10-01), Aratake
patent: 5255308 (1993-10-01), Hashimoto et al.
patent: 5375163 (1994-12-01), Kamimoto et al.
patent: 5517551 (1996-05-01), Arai
patent: 5559860 (1996-09-01), Mizikovsky
patent: 5574774 (1996-11-01), Ahlberg et al.
Hachimura Futoshi
Yatsu Hiroyuki
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Legree Tracy
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