Wireless communication system having base units which extracts channel and setup information from nearby base units

• US 5,608,780 A
• Filed: 09/01/1995
• Issued: 03/04/1997
• Est. Priority Date: 11/24/1993
• Status: Expired due to Fees

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Kendig, Eugene T., Gerszberg, Irwin, Russell, Jesse E.
• Primary Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US08/522,795
• Time in Patent Office: 550 Days
• Field of Search: 379/58, 379/60, 455/33.1, 455/33.2, 370/95.3
• US Class Current: 455/436
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 48/20 Selecting an access point

Abstract

A wireless communication system for servicing personal communicators is connected to a a digital switch of a landline telephone network. The communication system includes a plurality of wireless communication base units, each having wireless circuitry enabling it to extract channel and setup information other from nearby wireless communication base units. Each unit measures the RSSI of channels of neighboring wireless communication base units and makes channel assignments to a base unit in response to RSSI measurements being compared to a threshold.

Claims

1. A radiotelephone communication system including a plurality of wireless communication base stations;

digital line connections each connecting one of the plurality of wireless communication base stations to a digital integrated service telephone switch and its data included in a landline telephone network, and operative for accessing, through the digital integrated service telephone switch, each others setup and control channel information; and

an adjunct advanced intelligent network means connected to the digital integrated service telephone switch;

each wireless communication base station including means for communicating by radio signals with another one of the plurality of wireless communication base stations including scanning its setup channels and utilizing data acquired for initialization of its circuits; and

including means to register and control calls from and to mobile telephone terminals, including means to tune frequencies and connect an audio path to a landline telephone network;

means included in the first and second wireless communication base stations for responding to the data acquired and setting a configuration state common to the plurality of wireless communication base stations;

the advanced intelligent network controlling routing of calls to the wireless communication base stations and to the registered mobile telephone terminals;

each wireless communication base station accepting responses of mobile telephone terminals to set up calls and commands to terminate calls with mobile telephone terminals;

means within each wireless communication base station to select mobile telephone terminals to service and to designate others of the plurality of wireless communication base stations as neighbors based on RSSI (Received Signal Strength Indicator) signal strength measurements and to use the RSSI strength measurements to limit service area.

2. A radiotelephone communication system including a plurality of wireless communication base stations, as claimed in claim 1;

wherein;

the wireless communication terminal, includes;

a memory for storing wireless communication base station and mobile telephone station identities;

a controller responsive to the memory for controlling frequency selection based on memory content.

3. A radiotelephone communication system including a plurality of wireless communication base stations, as claimed in claim 2;

wherein;

the memory is structured in tabular format including a table of wireless communication base station identities, a table of RSSI values correlated to wireless communication base station identities, a table of mobile identities correlated to RSSI values, and a table of wireless communication base stations correlated to highest RSSI values.

4. A radiotelephone communication system including a plurality of wireless communication base stations, as claimed in claim 3;

wherein;

the controller includes stored instructions for measuring RSSI values and means for sorting wireless communication base stations with with RSSI values according to signal strength.

5. A radiotelephone communication system including a plurality of wireless communication base stations, as claimed in claim 4;

wherein;

the controller further includes means for relating wireless communication base stations as neighbors of one another.

6. A radiotelephone communication system as claimed in claim 1, wherein:

the advanced intelligent network is connected for controlling information flow between individual ones of the plurality of wireless communication base stations, the information including location information for individual wireless communication base stations.

7. In a wireless personal communication system;

a plurality of wireless personal communication base units each connected to interface with an ISDN (Integrated Services Digital Network) switch of a Public Switched Telephone Network and each having means for radio communication with each other and each having memory storage means to store identities of neighboring wireless communication base units;

a mobile telephone terminal registered with one of the plurality of wireless communication base units;

each of the plurality of wireless communication units having means for effecting re-registration of the mobile telephone terminal as it moves throughout a PCS (Personal Communication Service) coverage area;

each of the plurality of wireless personal communication base units being connected to an advanced intelligent network included in the public switched telephone network;

the advanced intelligent network being operative for routing calls to selected ones of the plurality of wireless communication base unit where the desired mobile terminal to be called is registered;

the wireless personal communication base unit including means for paging a desired mobile terminal on a digital setup channel;

the wireless personal communication base unit accepting a response of the mobile terminal proceeding to set up call; and

establish a radio frequency time slot channel;

a main controller included within the wireless personal communication base unit operative to configure the RF (Radio Frequency) transmitter of the base unit to tune to the assigned frequency channel and connect the audio path between the baseband processor, and further operative to facilitate handoff of the mobile terminal in response to signal strength measurements and data stored in the means to store identities;

interface sub-modules contained within the Wireless Personal for connecting to the audio path; and

means for terminating the call by a line disconnection.

8. In a wireless personal communication system;

as claimed in claim 7;

means for scanning RF channels and taking RSSI (Received Signal Strength Indicator) measurements;

means for identifying channels that have RSSI measurements below a certain threshold;

means for setting priority service in will be dependent upon the level of RSSI, measures of nearby wireless personal communication base units, and storing these levels in an individual threshold table;

means for identifying information contained in these tables as;

RSSI less than a RSSI minimum, RSSI more than a RSSI maximum;

adjusting power in the wireless communication base unit in response to identifying information to provide adequately powered service to a mobile terminal in a given registration area.