Time-reuse partitioning system and methods for cellular radio telephone systems

• US 5,844,894 A
• Filed: 02/29/1996
• Issued: 12/01/1998
• Est. Priority Date: 02/29/1996
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Dent, Paul W.
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US08/608,717
• Time in Patent Office: 1,006 Days
• Field of Search: 370/329, 370/330, 370/336, 370/337, 370/345, 370/347, 370/350, 370/436, 370/442, 455/62, 455/422, 455/426, 455/446, 455/447, 455/450, 455/452, 455/507, 455/517, 455/524
• US Class Current: 370/330
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 16/04 Traffic adaptive resource partitioning
• CPC Class Codes: H04W 16/12 Fixed resource partitioning
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems

Abstract

Time slots of a plurality of time-division multiple access (TDMA) cellular radiotelephone base stations are synchronized. Cellular radiotelephone frequencies are allocated among the plurality of base stations according to a first frequency allocation system in a first synchronized time slot and according to a second frequency allocation system in a second synchronized time slot. Each frequency allocation system may include an adaptive channel allocation system, a frequency reuse system, a frequency reuse partitioning system or a fixed frequency reuse system. Spreading codes of a plurality of code-division multiple access (CDMA) cellular radiotelephone base stations are synchronized. Cellular radiotelephone frequencies are allocated among the plurality of base stations according to a first frequency allocation system for a first synchronized spreading code and according to a second frequency allocation system for a second synchronized spreading code. Each frequency allocation system may include an adaptive channel allocation system, a frequency reuse system, a frequency reuse partitioning system or a fixed frequency reuse system. Cellular radiotelephone systems and methods affording increased base station channel capacity, more efficient spectrum utilization and improved equipment migration are thus provided.

Claims

1. A cellular radiotelephone system comprising:

a plurality of time division multiple access (TDMA) cellular radiotelephone base stations, each of which serves a cellular radiotelephone cell and communicates radiotelephone communications with cellular radiotelephones using radiotelephone communications signals communicated over a like plurality of sequential time slots;

time-slot synchronizing means for synchronizing said like plurality of sequential time slots among said plurality of base stations, such that a corresponding time slot for each base station is used concurrently, to produce synchronized time slots among said plurality of base stations;

time-reuse partitioning means for allocating cellular radiotelephone frequencies among said plurality of base stations in a first one of said synchronized time slots according to a first frequency allocation system and for allocating cellular radiotelephone frequencies among said plurality of base stations in a second one of said synchronized time slots according to a second frequency allocation system different from said first frequency allocation system wherein said time reuse partitioning means comprises means for allocating cellular radiotelephone frequencies from a first frequency reuse pool in a first one of said synchronized time slots and for allocating cellular radiotelephone frequencies from a second frequency reuse pool different from said first frequency reuse pool in a second one of said synchronized time slots; and

means for receiving a request for a service type from a cellular radiotelephone served by one of said plurality of base stations and wherein said time reuse partitioning means assigns said first synchronized time slot, corresponding to said first frequency reuse pool, to the cellular radiotelephone responsive to a request for a first service type and to said second time synchronized time slot, corresponding to said second frequency reuse pool, to the cellular radiotelephone responsive to a request for a second service type.

2. A system according to claim 1:

wherein said first frequency allocation has a number of subscribers; and

wherein said time-reuse partitioning means further comprises means responsive to said number of subscribers of said first frequency allocation system for allocating cellular radiotelephone frequencies among said plurality of base stations according to said first frequency allocation system in a third one of said synchronized time slots.

3. A system according to claim 1 further comprising means for receiving a request for a service type from a cellular radiotelephone and wherein said time reuse partitioning means comprises means for allocating frequencies responsive to a received request for a service type.

4. A system according to claim 3 wherein said service type comprises one of a digital speech service, a digital data service, a packet data service, a control message service, a facsimile service, an image service and a code division multiple access (CDMA) service.

5. A system according to claim 1:

wherein said first service type comprises digital voice service and said second service type comprises a packet data service; and

wherein said first frequency reuse pool comprises all available frequencies in the cellular radiotelephone system and said second frequency pool comprises frequencies unused in adjacent cells.

6. A system according to claim 1 wherein said first service type comprises a wideband service and said second service type comprises a narrowband service;

and

wherein said first frequency reuse pool comprises a plurality of wide frequency bands and said second frequency reuse pool comprises a plurality of narrow frequency bands.

7. A system according to claim 6 wherein said wideband service comprises a high speed data service and wherein said narrow service comprises one of a digital voice service and a low speed digital data service.

8. A system according to claim 6 wherein said wideband service comprises a code division multiple access (CDMA) service.

9. A cellular radiotelephone system comprising:

a plurality of time division multiple access (TDMA) cellular radiotelephone base stations, each of which serves a cellular radiotelephone cell and communicates radiotelephone communications with cellular radiotelephones using radiotelephone communications signals communicated over a like plurality of sequential time slots;

time-slot synchronizing means for synchronizing said like plurality of sequential time slots among said plurality of base stations, such that a corresponding time slot for each base station is used concurrently, to produce synchronized time slots among said plurality of base stations; and

time-reuse partitioning means for allocating cellular radiotelephone frequencies among said plurality of base stations in a first one of said synchronized time slots according to a first frequency allocation system and for allocating cellular radiotelephone frequencies among said plurality of base stations in a second one of said synchronized time slots according to a second frequency allocation system different from said first frequency allocation system;

wherein said first frequency allocation system is one of a first adaptive channel allocation system, a first frequency reuse system, a first frequency reuse partitioning system and a first fixed frequency reuse system, and wherein said second frequency allocation system is one of a second adaptive channel allocation system, a second frequency reuse system, a second frequency reuse partitioning system and a second fixed frequency reuse system.

10. A method for operating a plurality of time division multiple access cellular radiotelephone base stations, each of which communicates with cellular radiotelephones using a like plurality of sequential time slots, the method comprising:

synchronizing said like plurality of sequential time slots among said plurality of base stations, such that a corresponding time slot for each base station is used concurrently, to produce synchronized time slots among said plurality of base stations; and

allocating cellular radiotelephone frequencies among said plurality of base stations according to a first frequency allocation system in a first one of said time slots and according to a second frequency allocation system different from said first frequency allocation system in a second one of said time slots;

wherein said step of allocating comprises a step of allocating cellular radiotelephone frequencies among said plurality of base stations according to one of a first adaptive channel allocation system, a first frequency reuse system, a first frequency reuse partitioning system and a first fixed frequency reuse system in said first one of said synchronized time slots and according to one of a second adaptive channel allocation system, a second frequency reuse system, a second frequency reuse partitioning system and a second fixed frequency reuse system in said second one of said synchronized time slots.

11. A method according to claim 10 wherein said step of allocating further comprises the step of allocating cellular radiotelephone frequencies among said plurality of base stations according to said first frequency allocation in a third one of said synchronized time slots to thereby adapt to increasing users of said first frequency allocation system.

12. A method for operating a plurality of time division multiple access cellular radiotelephone base stations, each of which communicates with cellular radiotelephones using a like plurality of sequential time slots, the method comprising:

synchronizing said like plurality of sequential time slots among said plurality of base stations, such that a corresponding time slot for each base station is used concurrently, to produce synchronized time slots among said plurality of base stations;

allocating cellular radiotelephone frequencies among said plurality of base stations according to a first frequency allocation system in a first one of said time slots and according to a second frequency allocation system different from said first frequency allocation system in a second one of said time slots wherein said allocating step further comprises allocating cellular radiotelephone frequencies from a first frequency reuse pool in a first one of said synchronized time slots and allocating cellular radiotelephone frequencies from a second frequency reuse pool different from said first frequency reuse pool in a second one of said synchronized time slots;

receiving a request for a service type from a cellular radiotelephone served by one of said plurality of base stations;

assigning said first synchronized time slot, corresponding to said first frequency reuse pool, to the cellular radiotelephone responsive to a request for a first service type; and

assigning said second synchronized time slot, corresponding to said second frequency reuse pool, to the cellular radiotelephone responsive to a request for a second service type.