Telecommunications – Having single-channel telephone carrier – Including call signaling
Reexamination Certificate
1999-01-05
2001-07-10
Vo, Nguyen T. (Department: 2682)
Telecommunications
Having single-channel telephone carrier
Including call signaling
C455S445000
Reexamination Certificate
active
06259905
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the field of communications. In particular, the invention relates to minimizing dialing and correcting delays in wireless local loop systems and other systems that are prone to such delays.
2. Description of the Related Art
The commercial importance of Wireless Local Loop Systems (“WLL”) using Fixed Subscriber Units (“FSU”) is increasing all over the world. A WLL System is designed to connect a subscriber to the telephone network using wireless methods. These systems may use an FSU to connect a conventional telephone to the network using wireless means. A design goal for these systems is to minimize the delay between the time that a subscriber goes off-hook to originate a call and the time that dial tone is provided to the subscriber indicating that it is time to dial.
The delay is caused by the time required to establish a wireless communications channel for a telephone. It is undesirable to have a wireless communications channel be maintained all of the time because this does not use the wireless communications bandwidth efficiently.
Other communications systems include these types of delay. For example, voice over IP technology may encounter long delays before a dial tone is received at the telephone.
Therefore, it is desirable to have a communications system with a reduced dialing and connection delay.
SUMMARY OF THE INVENTION
Various embodiments of the invention include a method of sending local dial tone to the subscriber from the fixed subscriber unit (FSU). The method can include receiving and memorizing DTMF dialing from a connected telephone. Outpulse this DTMF dial signal information from the FSU to the network. After establishing the wireless communication between the FSU and a wireless base station, providing a cut-through of the audio path between the network and the subscriber.
Some embodiments of the invention support feature transparency issues regarding unintentional off-hook states, private line automatic ring-down operation, FLASH, re-answer and disconnect.
Other embodiments of the invention support local dial tone in any system that would otherwise provide delayed dial tone to a subscriber. For example, one embodiment of the invention provides dial tone for voice over IP systems.
REFERENCES:
patent: 5475735 (1995-12-01), Williams et al.
patent: 5933786 (1999-08-01), Sarpola et al.
patent: 5983117 (1999-11-01), Sandler et al.
patent: 6002919 (1999-12-01), Posti
patent: 6052575 (2000-04-01), Lahdemaki et al.
Berkowitz Paul
Huang William
Nishiyama Takeshi
Ohmori Tadashi
Mehrpour N.
UTStarcom Inc.
Vo Nguyen T.
Wilson Sonsini Goodrich & Rosati
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