Code division multiple access modem interface

• US 6,973,523 B1
• Filed: 10/27/2000
• Issued: 12/06/2005
• Est. Priority Date: 03/27/2000
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Kaewell, John D. Jr., Gavnoudias, Stratis
• Primary Examiner(s): Auve, Glenn A.
• Assistant Examiner(s): Lee, Christopher E.
• Application Number:
  US09/699,145
• Time in Patent Office: 1,866 Days
• Field of Search: 370/360, 370/364, 370/525, 370/458, 370/535, 370/352, 370/395, 370/524, 375/150, 375/340, 455/445, 710/305, 714/800, 714/755, 379/93, 379/221
• US Class Current: 710/305
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04W 92/10 between terminal device and access point, i.e. wireless air interface

Abstract

A modem interface transfers data between a high data rate interface and a wireless interface. The modem interface has a plurality of parallel data highways. Each data highway has frames with time slots for transferring data. The plurality of highways outputs data to the high data rate interface and the wireless interface in selected time slots. At least one of the data highways has an input configured to receive data from the high data rate interface in selected time slots. At least one of the data highways has an input configured to receive data from the wireless interface in selected time slots. A processor controls the transfer of data between the plurality of highways.

Claims

1. A modem interface for transferring data between a high data rate interface and a wireless interface, the modem interface comprising:

a plurality of parallel data highways having frames, each with sixteen time slots for transferring data, the plurality of parallel data highways outputting data to the high data rate interface and the wireless interface in selected time slots, each parallel data highway being at least partially dedicated to a separate function, wherein;

a first parallel data highway using all sixteen of its time slots for transferring data to and from an external parallel data highway;

a second parallel data highway using eight of its time slots to transfer data to and from a digital signal processor (DSP) and using eight of its time slots to interface with telephone interface components; and

a third parallel data highway using nine of its time slots for high-level data link controlling (HDLC) controllers, using three of its time slots to transfer data to and from a second processor, and using four of its time slots for carrying data received and for transmission over the wireless interface, said transmission data being transmitted over four traffic channels;

the second processor for controlling data transfer between the plurality of parallel data highways and sending data using a sub-plurality of the parallel data highways;

the DSP processor sending data using a single one of the parallel data highways;

one of the DSP and second processors slaved to the other of the DSP and second processors; and

said two processors using said parallel data highways at the high data rate interface and thereby communicating at a high data rate using said parallel data highways.

2. The modem interface of claim 1 wherein the high data rate interface is an IOM-2 highway.

3. The modem interface of claim 1 wherein the high data rate interface is a PCM highway.

4. The modem interface of claim 1 wherein each of the three parallel data highways has a 2 Mb/s data rate.

5. The modem interface of claim 1 further comprising a plurality of read and write devices, each write device fixedly writing to one of the plurality of parallel data highways and each read device reading data from any of the plurality of parallel data highways.

6. The modem interface of claim 5 wherein the second processor controls each read device so that each read device reads from a selected one of the parallel data highways.

7. The modem interface of claim 1 further characterized by

the modem interface receiving data having a first high-level data link controlling (HDLC) encoding, the first HDLC encoded date being encoded into a second HDLC format at a first station using three HDLC controllers such that the produced data is double HDLC encoded and the double HDLC encoded data transmitted over the wireless interface using four traffic channels;

and

the modem interface receiving the double HDLC encoded data and removing the second HDLC encoding to recover the first HDLC encoded data at the second station, the first HDLC encoding and a second HDLC encoding facilitating error correction over the wireless interface while providing for an integrity of first HDLC encoded data over the wireless interface.

8. A method for transferring data between a high data rate interface and a wireless interface, the method comprising:

providing a plurality of parallel data highways having frames, each with sixteen time slots for transferring data;

inputting data to the parallel data highways from the high data rate interface and the wireless interface in selected time slots;

controlling data transfer between the plurality of highways; and

outputting data to the high data rate interface and the wireless interface in selected time slots;

said parallel data highways being at least partially dedicated to a separate function wherein;

a first parallel data highway using all sixteen of its time slots for transferring data to and from an external parallel data highway;

a second parallel data highway using eight of its time slots to transfer data to and from a digital signal processor (DSP) and using eight of its time slots to interface with telephone interface components; and

a third parallel data highway using nine of its time slots for high-level data link controlling (HDLC) controllers, using three of its time slots to transfer data to and from a second processor, and using four of its time slots for carrying data received and for transmission over the wireless interface, said transmission data being transmitted over four traffic channels;

and wherein the second processor for sending data using a sub-plurality of the parallel data highways and the DSP processor sending data using a single one of the parallel data highways, one of the DSP and second processors slaved to the other of the DSP and second processors, and said two processors using said parallel data highways at the high data rate interface and thereby communicating at a high data rate using said parallel data highways.

9. The method of claim 8 wherein the high data rate interface is an IOM-2 highway.

10. The method of claim 8 wherein the high data rate interface is a PCM highway.

11. The method of claim 8 wherein each of the three parallel data highways has a 2 Mb/s data rate.

12. The method of claim 8 wherein the controlling includes using a plurality of read and write devices, each write device fixedly writing to one of the plurality of parallel data highways and each read device reading data from any of the plurality of parallel data highways.

13. The method of claim 8 comprising:

producing data having a first high-level data link controlling (HDLC) encoding at a first station for transfer over the wireless interface;

encoding the first HDLC encoded data into a second HDLC format using three HDLC controllers at the first station such that the produced data is double HDLC encoded;

transmitting the double HDLC encoded data over the wireless interface using four traffic channels;

receiving the double HDLC encoded data at the second station; and

removing the second HDLC encoding to recover the first HDLC encoded data at a second station, the first HDLC encoding and the second HDLC encoding facilitating error correction over the wireless interface while providing for an integrity of first HDLC encoded data over the wireless interface.

14. The method of claim 13 wherein the first station is a radio network terminal and the second station is a radio carrier station, the method further comprising:

prior to producing the first HDLC encoded data, receiving the first HDLC encoded data from an IOM-2 highway.

15. The method of claim 13 wherein the first station is a radio carrier station and the second station is a radio network terminal, the method further comprising:

prior to producing the first HDLC encoded data, receiving the first HDLC encoded data from a PCM highway.

16. A radio network terminal (RNT) for transferring data between a high data rate interface and a wireless interface, the RNT comprising:

a receiver and a transmitter for transferring data over the wireless interface;

an input and an output for transferring data over the high data rate interface;

a plurality of parallel data highways having frames, each with sixteen time slots for transferring data, the plurality of parallel data highways outputting data to the high data rate interface and the wireless interface in selected time slots, each parallel data highway being at least partially dedicated to a separate function, wherein;

a first parallel data highway using all sixteen of its time slots for transferring data to and from an external parallel data highway;

a second parallel data highway using eight of its time slots to transfer data to and from a digital signal processor (DSP) and using eight of its time slots to interface with telephone interface components; and

a third parallel data highway using nine of its time slots for high-level data link controlling (HDLC) controllers, using three of its time slots to transfer data to and from a second processor, and using four of its time slots for carrying data received and for transmission over the wireless interface, said transmission data being transmitted over four traffic channels;

the second processor for controlling data transfer between the plurality of highways and sending data using a sub-plurality of the parallel data highways; and

the DSP processor sending data using a single one of the parallel data highways;

one of the DSP and second processors slaved to the other of the DSP and second processors; and

said two processors using said parallel data highways at the high data rate interface and thereby communicating at a high data rate using said parallel data highways.

17. The RNT of claim 16 wherein the receiver and the transmitter transfer data using QPSK modulation in CDMA format.

18. The RNT of claim 16 wherein the RNT is operatively coupled to an ISDN terminal via the high data rate interface.

19. The RNT of claim 16 wherein the high data rate highway is an IOM-2 highway.

20. The RNT of claim 16 further characterized by:

the modem interface receiving data having a first high-level data link controlling (HDLC) encoding the first HDLC encoded data into a second HDLC format using three HDLC controllers at the first station such that the produced data is double HDLC encoded and the double HDLC encoded data transmitted over the wireless interface using four traffic channels; and

the modem interface receiving the double HDLC encoded data and removing the second HDLC encoding to recover the first HDLC encoded data at the second station, the first HDLC encoding and the second HDLC encoding facilitating error correction over the wireless interface while providing for an integrity of first HDLC encoded data over the wireless interface.

21. A method of communicating data over a wireless interface of a wireless communication network having a first station and a second station, the method comprising:

producing data having a first high-level data link controlling (HDLC) encoding at the first station for transfer over the wireless interface;

encoding the first HDLC encoded data using three HDLC controllers into a second HDLC format at the first station such that the produced data is double HDLC encoded;

transmitting the double HDLC encoded data over the wireless interface using four traffic channels;

receiving the double HDLC encoded data at the second stations; and

removing the second HDLC encoding to recover the first HDLC encoded data at the second station, the first HDLC encoding and the second HDLC encoding facilitating error correction over the wireless interface while providing for an integrity of first HDLC encoded data over the wireless interface.

22. The method of claim 21 wherein the first station is a radio network terminal and the second station is a radio carrier station, the method further comprising:

prior to producing the first HDLC encoded data, receiving the first HDLC encoded data from an IOM-2 highway.

23. The method of claim 21 wherein the first station is a radio carrier station and the second station is a radio network terminal, the method further comprising:

prior to producing the first HDLC encoded data, receiving the first HDLC encoded data from a PCM highway.