Radio port in a wireless personal communication system

• US 5,758,294 A
• Filed: 06/07/1995
• Issued: 05/26/1998
• 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: Coughlin, Desmond, Pant, Ranjan, Khan, Tayyab, Ganesan, Kalyan, Johnson, Harry, Liau, Victor
• Primary Examiner(s): Bost, Dwayne D.
• Assistant Examiner(s): MAUNG, NAY AUNG
• Application Number:
  US08/476,848
• Time in Patent Office: 1,084 Days
• Field of Search: 455/277.2, 455/277.1, 455/33.1, 455/33.2, 455/33.3, 455/33.4, 455/60, 455/53.1, 455/84, 455/86, 455/89, 455/315, 455/209, 379/56, 379/58, 379/59, 370/95.3, 370/95.1, 370/336, 370/337, 370/347, 370/442, 370/321, 370/323, 348/10, 348/19
• US Class Current: 455/561
• 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 radio port in a wireless personal communications system. The radio port includes a first channel in communication with a first subscriber unit, a second channel in communication with a second subscriber unit, and a switching device connecting the first channel to the second channel so that the first subscriber unit may communicate directly with the second subscriber unit. In another preferred embodiment, the radio port includes a plurality of antennas, an RF receive section, an RF transmit section, an analog port adapted for connection to an analog telephone line, a digital dataport for receiving and transmitting digital signals, and a databus interconnecting the RF receive section, RF transmit section, analog port, and digital dataport. The RF receive section includes a diversity selection unit receiving an input signal from each of the antennas. The RF transmit section generates an output signal to be transmitted over at least one of the antennas.

Claims

1. A radio port for receiving and transmitting digital information using a TDM/TDMA protocol in a wireless personal communications system, said radio port comprising:

a plurality of antennas;

an RF receive section including a diversity selection unit receiving an input signal from each of the antennas;

an RF transmit section for generating an output signal to be transmitted over at least one of the antennas;

a databus interconnecting said RF receive section and said RF transmit section; and

a call switching device, connected to the RF receive and transmit sections, said switching device communicating information between a first subscriber unit and a second subscriber unit, said first and second subscriber units in communication with the radio port wherein the first and second subscriber units communicate directly via the radio port and independently of any other switching device.

2. The radio port of claim 1, wherein said switching device comprises a time slot interchange unit for removing and inserting information into a memory buffer for temporary storage between reception and transmission.

3. The radio port of claim 2 wherein the time slot interchange unit comprises a digital signal processor (DSP) and the memory buffer comprises random access memory (RAM).

4. A radio port in a wireless communication system comprising:

a plurality of antennas;

an RF receive section for receiving digital information in time division multiple access (TDMA) format, the RF receive section including a diversity selection unit receiving an input signal from each of the antennas;

an RF transmit section for generating a time division multiplexed (TDM) output signal to be transmitted over at least one of the antennas;

an analog port adapted for connection to an analog telephone line; and

a databus interconnecting said RF receive section, said RF transmit section, and said analog port.

5. The radio port of claim 4, wherein said analog port includes a digital signal processor.

6. The radio port of claim 4, wherein said plurality of antennas are positioned spatially and angularly diverse from each other.

7. The radio port of claim 4 further comprising a digital dataport for receiving and transmitting digital signals, said digital dataport in communication with said databus.

8. The radio port of claim 4 further comprising a cable television transport module in communication with said databus for modulating and demodulating information from said databus on cable television transmission lines.

9. The radio port of claim 4 further comprising a circuit having two receive chains for downconverting radio frequency signals in a wireless personal communications system, each receive chain comprising:

a first mixer coupled to a first local oscillator for producing an adjustable first local oscillator frequency;

a second mixer switchably coupled to a second local oscillator centered at a predetermined second local oscillator frequency; and

a third mixer coupled to a third local oscillator centered at a predetermined third local oscillator frequency.

10. The radio port of claim 9, wherein the first local oscillator frequency is adjustable in the range of 2.125 to 2.205 GHz.

11. The radio port of claim 9, wherein the second oscillator frequency is 225.85 Mhz.

12. The radio port of claim 9, wherein the third local oscillator frequency is 9.932 MHz.

15. The radio port of claim 4, further comprising a universal circuit board capable of functioning as one of a radio port and a subscriber unit, said universal circuit board having a memory block containing a signal encoding/decoding program.

16. The radio port of claim 4, wherein the universal board further comprises a switchably enabled SLIC.

17. The radio port of claim 4, wherein the universal board further comprises at least two antennas.

13. A radio port for receiving and transmitting digital information using a TDM/TDMA protocol in a personal access communications system (PACS) comprising:

a plurality of antennas;

an RF receive section including a diversity selection unit receiving an input signal from each of the antennas;

an RF transmit section for generating an output signal to be transmitted over at least one of the antennas;

a databus interconnecting said RF receive section and said RF transmit section;

said radio port in communication with at least one subscriber unit; and

said radio port connected to at least one radio port controller by cable television wire, wherein said radio port controller is at the headend of a CATV communication link.

14. The radio port of claim 13, further comprising an analog port in communication with said databus and adapted for connection to an analog telephone line.

18. A method of communicating information in a wireless personal communications system comprising the steps of:

communicating information from a first subscriber unit to a radio port over a TDM/TDMA air interface, the radio port having a memory buffer and a time slot interchange unit;

receiving the information at the radio port and shifting said information into the memory buffer with the time slot interchange unit in the radio port for temporary storage;

shifting the information from the memory buffer with the time slot interchange unit; and

transmitting the information from the radio port to a second subscriber unit over the TDM/TDMA air interface, whereby the first and second subscriber units communicate directly through the radio port.