Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-06-29
2002-12-31
Trost, William (Department: 2683)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S438000, C455S439000, C455S442000, C370S331000
Reexamination Certificate
active
06501952
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates, in general, to wireless communication systems, and more particularly, to an apparatus, method and system for mobile wireless communication hand-off utilizing directed call pick up with barge-in.
BACKGROUND OF THE INVENTION
Mobile wireless communication systems typically employ many base stations (such as cell sites) to provide wireless communication throughout a given geographic region. As a mobile unit may traverse the geographic region, the communication to and from the mobile unit may occur through one or more of these base stations. To maintain an ongoing communication session during such transitions between base stations, various hand-off methods have evolved to transfer the wireless communication to the mobile unit from one base station to another base station, while maintaining such an ongoing call or session.
In the prior art, for some of the various methods utilized during such hand-offs, the communication session may suffer from some degree of interruption, which may be noticeable to the consumer of wireless communication services. As a consequence, a need remains to provide for comparatively seamless hand-offs, which do not interrupt ongoing communication sessions and which are imperceptible to the consumer.
In addition, while other prior art systems may provide comparatively seamless hand-offs, such hand-offs typically utilize considerable network resources. In an Autoplex® system, for example, in addition to switches and base stations, another network entity referred to as an Executive Call Processor (“CP”) selects a server at the new cell site, while another network entity referred to as a Call Processing Database Node (“DN”) transmits various data link messages to the current and new cell sites, adding an additional path to the existing call, directing the new cell site to activate a wireless voice link, and directing the current (serving) cell site to direct the mobile to retune to the new wireless voice link at the new cell site.
As a consequence, a need remains for a wireless communication system to provide comparatively seamless and imperceptible hand-offs. In addition, such a wireless communication system should be reasonably efficient and capable of cost-effective implementation, eliminating or minimizing the use of additional network resources.
SUMMARY OF THE INVENTION
The wireless communication system of the present invention provides virtually seamless and imperceptible hand-offs of communication sessions of mobile units. The various embodiments of the present invention are reasonably efficient and capable of cost-effective implementation in existing communication equipment such as switches and base stations. The various embodiments of the present invention may also be implemented in either digital or analog communication environments. Moreover, the various embodiments of the present invention eliminate or minimize the use of additional network resources such as ECPs and CDNs, while being compatible with other intelligent network devices and systems.
In accordance with the present invention, an apparatus, method and system are provided for hand-off of a communication session utilizing directed call pick up with barge-in, in which the communication session of a mobile unit is transferred from a serving base station to a target base station. The preferred system includes a switch coupled to a serving base station and a target base station. When a hand-off of the communication is indicated, the target base station generates, as a separate call, a barge-in call path to a switch. The switch then connects the barge-in call path to the communication session of the mobile unit to form a reverse three-way communication session between the mobile unit (via the serving base station), the target base station, and the switch. The serving base station then directs the mobile unit to communicate with the target base station for continuation of the communication session through the barge-in call path, and the switch releases the serving base station from the communication session.
As a consequence, the communication session of the mobile unit has been handed off, seamlessly and without interruption, from the serving base station to the target base station. Such a hand-off has also occurred utilizing minimal network resources, the switch and the base stations, without involvement of other intelligent or supervisory network elements.
The barge-in call path from the target base station to the switch is established through the transmission of various messages between the target base station and the switch. The switch is correspondingly configured to acknowledge and connect the barge-in call path to the communication session upon receipt of these various messages. In one of the embodiments, the target base station includes instructions to transmit a call set up message to the switch, to transmit a first sequence of information messages to the switch requesting a directed call pick up with barge-in, and to transmit a second sequence of information messages to the switch specifying a first predesignated directory number associated with the communication session at the serving base station. As discussed in greater detail below, these various messages may be combined in a variety of ways.
Numerous other advantages and features of the present invention will become readily apparent from the following detailed description of the invention and the embodiments thereof, from the claims and from the accompanying drawings.
REFERENCES:
patent: 5590172 (1996-12-01), Lodwig et al.
patent: 5909487 (1999-06-01), Mainker
patent: 5940758 (1999-08-01), Chavez, Jr. et al.
patent: 6263203 (2001-07-01), Jahn
Foster Eugene William
Tomasko-Dean Kimberly Sue
Gamburd Nancy B.
Lucent Technologies - Inc.
Trost William
Yun Eugene
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