Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1996-09-27
2003-02-25
Trost, William (Department: 2683)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S422100, C455S435100, C455S465000
Reexamination Certificate
active
06526277
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates to an improved wireless communications system. More particularly, the preferred embodiment of the invention concerns a multiple mode communications system, including special handsets designed to operate with standard analog or digital protocols when within the coverage of a standard cellular radiotelephone network, and to automatically switch to an enhanced cordless mode that operates with unique protocols when within the coverage area provided by independent, low powers PICO cells that are connected to the wireline telephone network. Pico cells are provided at customer selected locations to cooperate with a framework of overlay cells that operate independently of the cells of the cellular network.
This overlay cell framework allows the service provider to exercise complete control over the operation of each special handset and the pico cell system by means of service control units and host stations. The standard cellular system can be further enhanced by the addition of zone identifier overhead messages which are ignored by standard handsets but interpreted by the special handsets to inform those customers continuously of the special handset's current operating mode.
2. Description of Related Art
There has long been a recognized need for ubiquitous telecommunications services wherein each customer is assigned a personal service number and provided with suitable equipment which will permit the customer to have two-way communication capability (i.e., the ability to make and receive calls) regardless of the customer's changing location.
Systems that extend beyond traditional wireline telephone service have been developed in order to more closely achieve this capability from a technical perspective. For example, recent innovations in paging, standard cordless within the home telephone service, cellular telephone service and personal communications systems are well known. The designs of such systems all comprise efforts to cost effectively satisfy the need for ultimate ubiquitous service. However, each system has well recognized technical and cost disadvantages which cause it to fall short of providing ubiquitous telecommunications service.
Accordingly, a need still exists for an improved communications system that comes closer to providing ubiquitous communications service to customers than existing systems.
Related Patents
The following U.S. Patents assigned to the assignee of the present invention were issued to Robert G. Zicker et. al. and are related to this invention to the extent that they relate generally to improvements in telecommunications systems or service:
U.S. Pat. No.
Title
5,046,082
Remote Accessing System for Cellular Telephones
5,144,649
Cellular Radiotelephone Credit Card Paystation Method
5,159,625
Method of Selecting the Cellular System with Which a
Cellular Mobile Radiotelephone Communicates
5,220,593
Cellular Radiotelephone Credit Card Paystation Method
5,247,564
Adaptive Vehicle Alarm Detection and Reporting System
5,247,160
Method for Transmitting Credit Card Information for a
Group of Passengers
SUMMARY OF INVENTION
Therefore, it is an object of this invention to provide an improved telecommunications system which more completely meets customer needs for low cost, ubiquitous telecommunications service.
It is another object of the invention to provide an improved telecommunications system, designed to include a standard cellular network, and which further includes a network of overlay cells that operate independently of the cells of the cellular network.
It is a her object of the invention to provide, in such a system, a multi pico station at each customer location that, in turn, supports multiple portable telephone handsets, with each handset being capable of operating in a wireless or pico mode when within the customer premise, and in a standard cellular mode when away from the customer premises and yet within the cellular coverage area.
It is yet a further object of the invention to provide such an improved telecommunications system wherein call forwarding capability is provided in conjunction with distinctive ring so that a customer with a portable personal handset selected to operate in one of the dual modes can receive and readily identify incoming calls, directed to the assigned cellular customer number, through the unselected or inactive mode of the system
It is yet another object of the invention to provide automatic registration and control of such a dual mode portable handset, without customer action, and with the customer being provided with a display advising the status or mode which the handset is set to operate in at any time, so that the customer can make informed, cost-effective decisions as to call placement.
It is another object of the invention to provide in a dual mode system using one radio per handset, a mode of operation based upon a unique, though cellular compatible, protocol that permits easy dynamic channel allocation and occupancy.
It is another object of the invention to provide an alternate line option capability which permits selective allocation of call traffic between the customer premises and the cellular network.
These objects and other features and advantages of the invention are attained in a telecommunications system that is designed to, operate in conjunction with a standard cellular network having multiple cell sites of either analog or digital configuration and embodying standard geographical coverage. The system also includes a comparable network of overlay cells that operate independently of the standard cell sites of the cellular network. Alternatively, the system could be used within a radiotelephone network of other character, such as an SMR network, for example.
Preferably, each overlay cell provides radio communication coverage to a geographical area that corresponds generally to the cellular site area, but on a set of reserved cellular frequencies that are selected with the maximum possible separation with respect to the assigned cellular network signaling frequencies, so as to be non-interfering.
To cooperate with the overlay cells a base station, referred to hereinafter as a pico station, is provided at each customer site. Each pico station is designed to support up to six improved portable handsets which function in dual modes. In a first mode each handset functions as a normal portable network or cellular telephone, when it is physically removed from the proximity of the pico station. A second wireless mode of operation is described herein for the handsets of the system which has been referred to herein as enhanced cordless on the first iterations and will be referred to as the pico mode in subsequent usage. The enhanced cordless mode of this invention differs from the operation of standard cordless telephones in several respects. This system employs a unique burst mode communication control protocol between the handsets and the pico station which is not found in standard cordless operation. This protocol is compatible with cellular standards to permit dual mode operation which would not be possible with standard cordless. Moreover, the standard cordless frequency arrangement is obviously different from cellular frequencies used in this system. Other differences will become apparent from the description that follows, which result in operational improvements in the service offered.
The use of the unique protocol of this system permits remote activation and control using the 10k bit Manchester encoded data pathway inherent in cellular telephone hardware. Therefore, when close to the pico station, the handset operates as a cordless telephone supported by the pico station via a connection to the house PSTN wiling.
In the preferred mode, call delivery is provided through a link that may also include an alternate line option module connected between the pico station and the PSTN. With that arrangement, service can be provided through direct access from the pico station to the public switched telephone network, or alternati
Dion John K.
Zicker Robert G.
GTE Wireless Service Corporation
Nguyen Simon
Trost William
Weixel James K.
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