Colocated cellular radiotelephone systems

• US 4,893,327 A
• Filed: 11/25/1988
• Issued: 01/09/1990
• Est. Priority Date: 07/20/1987
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Williams, James, Stern, Morton
• Primary Examiner(s): Lev, Robert
• Application Number:
  US07/276,495
• Time in Patent Office: 410 Days
• Field of Search: 379/59, 379/60, 379/63, 379/56, 455/33, 455/32, 455/34, 455/54, 455/56, 455/58
• US Class Current: 455/453
• CPC Class Codes: H04W 16/06 Hybrid resource partitioning, e.g. channel borrowing
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

An existing cellular system (X-system 102) is interconnected with another cellular system (M-system (101) via inter-office trunks (150) to add additional switching capacity for providing telephone coverage to mobiles located throughout their common coverage area. X-system (102) includes a control terminal (120) coupled by data and voice lines to base sites (121-124) and by out trunks to a telephone central office (110). M-system (101) includes a control terminal (420) coupled by data and voice lines to base sites (411-415) and by in trunks and out trunks to the telephone central office (110). M-system base sites (411-414) are colocated with corresponding existing X-system base sites (121-124). Paging/access channels are assigned to M-system base sites (411-414) for processing all incoming originations from mobiles and paging mobiles for all outgoing originations. Access-only channels are assigned to X-system base sites (121-124) for processing mobile originations transferred to X-system (102) by a directed retry message from M-system (101). M-system (101) shares the mobile origination traffic with X-system (102) by sending a directed retry message to a percentage of the originating mobiles.

Claims

1. A method of controlling operation of a first cellular radiotelephone system pre-existing in a geographical area by a second cellular radiotelephone system wherein fixed site radio apparatus of said second cellular radiotelephone system is located in each cell including fixed site radio apparatus of said first cellular radiotelephone system, said method comprising the steps of:

operating all fixed site radio apparatus of said first cellular radiotelephone system in an access-only mode for processing radiotelephone calls directed thereto;

operating all fixed site radio apparatus of said second cellular radiotelephone system in a paging/access mode for processing all calls originated by radiotelephones in each cell of said first and second cellular radiotelephone systems; and

directing a predetermined percentage of telephone calls originated by radiotelephones from said second cellular radiotelephone system to said first cellular radiotelephone system.

2. The method according to claim 1, wherein said directing step further includes the step of sending a directed retry message to direct said predetermined percentage of originated telephone calls from said second cellular radiotelephone system to said first cellular radiotelephone system.

3. A method of processing radiotelephone calls in at least first and second radiotelephone system and a central office for providing telephone service to radiotelephones located in a geographical area, said geographical area divided into a plurality of cells, each cell assigned a plurality of voice radio channels, at least one paging/access radio channel and/or at least one access only radio channel which differ from those radio channels assigned to adjoining cells, said first radiotelephone system including a plurality of out trunks, a plurality of inter-office trunks and a plurality of fixed site radio apparatus each located in a different cell for communicating with said radiotelephones, and said second radiotelephone system including a plurality of in trunks, a plurality of out trunks, a plurality of inter-office trunks and a plurality of fixed site radio apparatus each located in a different cell for communicating with said radiotelephones, said method comprising the steps of:

coupling out trunks of said first radiotelephone system to the central office;

coupling in trunks and out trunks of said second radiotelephone system to the central office;

coupling interoffice trunks of said first radiotelephone system to inter-office trunks of said second radiotelephone system;

for a predetermined number of cells, covering each cell of said predetermined number of cells with one of the fixed site radio apparatus of said second radiotelephone system and one of the fixed site radio apparatus of said first radiotelephone system;

for each cell of said predetermined number of cells, assigning at least one access-only radio channel and at least one of the plurality of voice radio channels for the cell to the fixed site radio apparatus of said first radiotelephone system located in the cell, and assigning at least one paging/access radio channel and at least one of the plurality of voice radio channels for the cell to the fixed site radio apparatus of said second radiotelephone system located in the cell; and

for said predetermined number of cells, directing a predetermined percentage of telephone calls originated by radiotelephones from said second radiotelephone system to said first radiotelephone system.

4. A method of processing radiotelephone calls in at least first and second radiotelephone systems and a central office for providing telephone service to radiotelephones located in a geographical area, said geographical area divided into a plurality of cells, each cell assigned a plurality of voice radio channels, at least one paging/access radio channel and/or at least one access only radio channel which differ from those radio channels assigned to adjoining cells, said first radiotelephone system including a plurality of inter-office trunks and a plurality of fixed site radio apparatus each located in a different cell for communicating with said radiotelephones, and said second radiotelephone system including a plurality of in trunks, a plurality of out trunks, a plurality of inter-office trunks and a plurality of fixed site radio apparatus each located in a different cell for communicating with said radiotelephones, said method comprising the steps of:

coupling in trunks and out trunks of said second radiotelephone system to the central office;

coupling inter-office trunks of said first radiotelephone system to inter-office trunks of said second radiotelephone system;

for a predetermined number of cells, covering each cell of said predetermined number of cells with one of the fixed site radio apparatus of said second radiotelephone system and one of the fixed site radio apparatus of said first radiotelephone system;

for each cell of said predetermined number of cells, assigning at least one access-only radio channel and at least one of the plurality of voice radio channels for the cell to the fixed site radio apparatus of said first radiotelephone system located in the cell, and assigning at least one paging/access radio channel and at least one of the plurality of voice radio channels for the cell to the fixed site radio apparatus of said second radiotelephone system located in the cell; and

for said predetermined number of cells, directing a predetermined percentage of telephone calls originated by radiotelephones from said second radiotelephone system to said first radiotelephone system.

5. A communications system coupled to a central office for processing radiotelephone calls, comprising, in combination:

first and second radiotelephone systems for providing telephone service to radiotelephones located in a geographical area, said geographical area divided into a plurality of cells, each cell assigned a plurality of voice radio channels, at least one paging/access radio channel and/or at least one access-only radio channel which differ from those radio channels assigned to adjoining cells;

said first radiotelephone system including;

a plurality of inter-office trunks; and

a plurality of fixed site radio apparatus each located in a different cell for communicating with said radiotelephones; and

for a predetermined number of cells, the fixed site radio apparatus of said first radiotelephone system being assigned at least one access-only radio channel and at least two of the plurality of voice radio channels for the cell in which it is located;

said second radiotelephone system including;

a plurality of in trunks and a plurality of out trunks coupled to the central office;

a plurality of inter-office trunks coupled to inter-office trunks of said first radiotelephone system; and

a plurality of fixed site radio apparatus each located in different cell for communicating with said radiotelephones; and

for said predetermined number of cells, the fixed site radio apparatus of said second radiotelephone system being assigned at least one paging/access radio channel and at least two of the plurality of voice radio channels for the cell in which it is located, and one of the fixed site radio apparatus of said second radiotelephone system and one of the fixed site radio apparatus of said first radiotelephone system covering each cell of said predetermined number of cells.

6. A method of processing radiotelephone calls in at least first and second radiotelephone systems and a central office for providing telephone service to radiotelephones located in a geographical area, said geographical area divided into a plurality of cells, each cell assigned a plurality of voice radio channels and a plurality of paging/access radio channels which differ from those radio channels assigned to adjoining cells, said first radiotelephone system including a plurality of inter-office trunks and a plurality of fixed site radio apparatus each located in a different cell for communicating with said radiotelephones, and said second radiotelephone system including a plurality of interoffice trunks and a plurality of fixed site radio apparatus each located in a different cell for communicating with said radiotelephones, said method comprising the steps of:

coupling inter-office trunks of said first radiotelephone system to inter-office trunks of said second radiotelephone system;

for a predetermined number of cells, covering each cell of predetermined number of cells with one of the fixed site radio apparatus of said second radiotelephone system and one of the fixed site radio apparatus of said first radiotelephone system; and

for each cell of said predetermined number of cells, assigning at least one of the plurality of paging/access radio channels and at least one of the plurality of voice radio channels for the cell to the fixed site radio apparatus of said first radiotelephone system located in the cell, and assigning at least one of the plurality of paging/access radio channel and at least one of the plurality of voice radio channels for the cell to the fixed site radio apparatus of said second radiotelephone system located in the cell; and

for said predetermined number of cells, directing a predetermined percentage of telephone calls originated by radiotelephones from said second radiotelephone system to said first radiotelephone system.