Wireless personal communication system

• US 5,812,951 A
• Filed: 11/23/1994
• Issued: 09/22/1998
• Est. Priority Date: 11/23/1994
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Original Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Inventors: Pant, Ranjan, Khan, Tayyab, Goh, Kim, Liau, Victor, Coghlan, Desmond, Saunders, Barry, Fischler, Robert, Ganesan, Kalyan, Johnson, Harry
• Primary Examiner(s): Harvey, David E.
• Application Number:
  US08/344,272
• Time in Patent Office: 1,399 Days
• Field of Search: 348/12, 348/6, 379/58, 379/59, 379/60, 370/313, 370/314, 370/337, 370/347, 370/348, 455/403, 455/422, 455/426, 455/445, 455/450, 455/453, 455/462-466, 455/555, 455/551, 455/560, 455/561, 455/554
• US Class Current: 455/445
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/0602 using antenna switching H04B7/0686 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04B 7/0817 with multiple receivers and antenna path selection
• CPC Class Codes: H04Q 2213/13003 Constructional details of switching devices
• CPC Class Codes: H04Q 2213/13031 Pulse code modulation, PCM
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13072 Sequence circuits for call signaling, ACD systems
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13107 Control equipment for a part of the connection, distributed control, co-processing
• CPC Class Codes: H04Q 2213/13196 Connection circuit/link/trunk/junction, bridge, router, gateway
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13213 Counting, timing circuits
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/13292 Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/13298 Local loop systems, access network
• CPC Class Codes: H04Q 2213/13299 Bus
• CPC Class Codes: H04Q 2213/1332 Logic circuits
• CPC Class Codes: H04Q 2213/13335 : Simulation, emulation
• CPC Class Codes: H04Q 2213/13349 : Network management
• CPC Class Codes: H04Q 2213/1336 : Synchronisation
• CPC Class Codes: H04Q 2213/13396 : Signaling in general, in-band signalling
• CPC Class Codes: H04W 84/14 : WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

The present invention relates to a wireless personal communications system (WPCS) having several features embodied in several forms. In one embodiment, the, WPCS includes at least one RP, a first SU in communication with the RP, and a second SU in communication with the first SU through the RP without involving the RPC in the manner contemplated by the specification. The RP may preferably include a channel switching unit for connecting the first SU with the second SU without using any tariff lines to or from an RPC. Such an RP may be used as a component in a wireless PBX or Centrex system including ISDN based systems. Another preferred embodiment provides for a walkie-talkie option where the first SU communicates directly with the second SU, preferably over an unlicensed frequency. In another preferred embodiment, a plurality of SUs in communication with an RP may be accessed individually using a single dialed number.

Claims

1. A wireless personal communications system for carrying voice and data communication signals, the system comprising:

a radio port controller;

a radio port coupled to the radio port controller, said radio port having an RF transmit section transmitting digital information in a time division multiplexed (TDM) message frame, the radio port including a channel switching unit; and

first and second subscriber units, each of said subscriber units having an RF transmit section transmitting digital information in a time division multiple access (TDMA) format, wherein the channel switching unit is adapted to route communication signals between said first and second subscriber units without routing the communication signals through the radio port controller.

2. The system of claim 1, wherein said second subscriber unit is adapted for transmitting communication signals directly to said first subscriber unit without routing said communication signals through said radio port or said radio port controller.

3. The system of claim 2, wherein said second subscriber unit transmits the communication signals directly to said first subscriber unit over an unlicensed frequency.

4. The system of claim 1, wherein said system is a stand-alone system.

5. The system of claim 4, wherein said second subscriber communicates with said first subscriber over unused bandwidth available on existing cable television wires.

6. The system of claim 5, wherein said radio port controller has at least one digital microprocessor, said microprocessor having an interrupt of less than 1 millisecond.

8. A system according to claim 1, wherein one of said at least two subscriber units comprises a wireless terminal.

9. A system according to claim 1, wherein one of said at least two subscriber units comprises a wired terminal.

7. A wireless personal communications system including:

at least one radio port;

at least two subscriber units, wherein one of said subscriber units communicates with another of said subscriber units through at least one of said at least one radio port;

a radio port controller connected to said radio port, wherein said radio port controller has at least one digital microprocessor said microprocessor having an interrupt of less than 1 millisecond;

said radio port controller further comprising;

a first global resource processor for balancing loading among various other processors in the radio port controller;

a second global resource processor;

a disk drive coupled to the second global resource processor; and

said second global resource processor cooperates with said disk drive to perform at least some of the traditional access manager functions.

10. A wireless personal communications system comprising:

a radio port having an RF transmit section transmitting digital information in a time division multiplexed (TDM) message frame; and

first and second subscriber units, each of said subscriber units having an RF transmit section transmitting digital information in a time division multiple access (TDMA) format, said first and second subscriber units being adapted to selectively communicate with one another via said radio port, wherein said first subscriber unit may be accessed using the same dialed number as said second subscriber unit.

11. A system as defined in claim 10 wherein said first subscriber unit is individually accessed without accessing the second subscriber unit by entering a code in addition to said dialed number.

12. A wireless personal communications system comprising:

a radio port controller including a switching transcoder module (STM) having a plurality of digital signal processors, each digital signal processor being capable of processing both digitized voice and personal communication system messages;

a radio port coupled to the radio port controller, said radio port having an RF transmit section transmitting digital information in a time division multiplexed (TDM) format; and

at least two subscriber units, each of said subscriber units having an RF transmit section transmitting digital information in a time division multiple access (TDMA) format, said subscriber units being adapted for selective communication with one another via said radio port.

13. The system of claim 12, further comprising a plurality of memory buffers in communication with said plurality of digital processors.

14. The system of claim 13, wherein said buffers are circular buffers adapted to receive and transmit personal communication system messages from a radio port or from a digital switch.

15. The system of claim 14, wherein each STM further includes a central processor for allocating each time slot in each T1 communication line to at least one of said digital signal processors.

16. The system of claim 15, wherein said central processor communicates with each digital signal processor using inter-processor data messages.

17. A wireless personal communications system comprising:

a radio port controller including a channel access processor (CAP) for processing layer 2 personal communication system messages;

a radio port coupled to the radio port controller, said radio port having an RF transmit section transmitting digital information in a time division multiplexed (TDM) message frame; and

at least two subscriber units, each of said subscriber units having an RF transmit section transmitting digital information in a time division multiple access (TDMA) format, said subscriber units being adapted for selective communication with one another via said radio port.

18. A wireless personal communications system comprising:

a radio port controller including a plurality of processors executing a multi-tasking operating system wherein at least one of said processors creates a thread associated with a call processing routine;

a radio port coupled to the radio port controller, said radio port having an RF transmit section transmitting digital information in a time division multiplexed (TDM) message frame; and

at least two subscriber units, each of said subscriber units having an RF transmit section transmitting digital information in a time division multiple access (TDMA) format, said subscriber units being adapted for selective communication with one another via said radio port.

19. A wireless personal communications system for carrying voice and data communication signals, at least some of the communication signals being in TDM/TDMA format, the system comprising:

a radio port including a time slot interchange device for switching communication signals between time slot frames; and

at least two subscriber units, a first one of the subscriber units transmitting communication signals in a first time slot frame and a second one of the subscriber units transmitting communication signals in a second time slot frame;

wherein the time slot interchange device is adapted to switch the communication signals in the first time slot frame with the communication signals in the second time slot frame to permit direct communication between the first and second subscriber units through said radio port.

20. A system as defined in claim 19 wherein the time slot interchange device is further adapted to switch the communication signals in the first time slot frame with the communication signals in the second time slot frame.