Use of orthogonal or near orthogonal codes in reverse link

• US 9,496,915 B2
• Filed: 08/31/2012
• Issued: 11/15/2016
• Est. Priority Date: 07/17/2001
• Status: Expired due to Term

• Current Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Original Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Inventors: Proctor, James A., Alapuranen, Pertti O.
• Primary Examiner(s): Chery, Dady
• Application Number:
  US13/600,931
• Publication Number:
  US 20120320901A1
• Time in Patent Office: 1,537 Days
• Field of Search: 370/204, 370/208, 370/209, 370/335, 370/342, 370/441, 375/140, 375/141, 375/145
• US Class Current: 1/1
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7077 Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
• CPC Class Codes: H04J 13/0022 PN, e.g. Kronecker
• CPC Class Codes: H04J 13/18 Allocation of orthogonal codes
• CPC Class Codes: H04J 3/0635 Clock or time synchronisation in a network timer in protocols H04L69/28
• CPC Class Codes: H04L 7/043 Pseudo-noise [PN] codes variable during transmission synchronisation of spread spectrum receivers H04B1/69
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

An apparatus and method for use with a shared access communication channel is disclosed. A wireless network device receives signals and recovers data from a first plurality of subscriber units and a second plurality of subscriber units in a time interval. Received signals from the first plurality of subscriber units are distinguishable by having unique pseudo noise (PN) sequence with respect to others of the first plurality of subscriber units. Received signals the second plurality of subscriber units are distinguishable by a unique orthogonal sequence with respect to others of the second plurality of subscriber units. Received signals are distinguished between the first and second plurality of subscriber units based on detection of an orthogonal sequence present only in the received signals from the second plurality of subscriber units.

Claims

1. A wireless network device comprising:

circuitry configured to receive signals and recover data from a first plurality of subscriber units in a time interval including at least one time slot; and

circuitry configured to receive signals and recover data from a second plurality of subscriber units in the time interval;

wherein the received signal from each of the first plurality of subscriber units comprises a pseudo noise (PN) sequence that is different from a PN sequence of others of the first plurality of subscriber units;

wherein the received signal from each of the second plurality of subscriber units comprises an orthogonal sequence that is different from an orthogonal sequence of others of the second plurality of subscriber units, the received signal from each of the second plurality of subscriber units having a same PN sequence as the others of the second plurality of subscriber units; and

wherein received signals from the second plurality of subscriber units comprise an orthogonal sequence which is not present in the received signals from the first plurality of subscriber units; and

the wireless network device further comprising circuitry configured to transmit to each subscriber unit of the second plurality of subscriber units configuration information for use by that subscriber unit in determining the different orthogonal sequence of that subscriber unit.

2. The wireless network device of claim 1, wherein the circuitry is further configured to send each subscriber unit of the first plurality of subscriber units configuration information for use by that subscriber unit in determining the different PN sequence of that subscriber unit.

3. The wireless network device of claim 1, wherein the circuitry is further configured to send at least each subscriber unit of the second plurality of subscriber units timing adjustment information.

4. The wireless network device of claim 1, wherein the detected orthogonal sequence has a chipping rate less than the PN sequence.

5. A method comprising:

receiving signals and recovering data, by a wireless network device, from a first plurality of subscriber units and a second plurality of subscriber units in a time interval including at least one time slot;

wherein the received signal from each of the first plurality of subscriber units comprises a pseudo noise (PN) sequence that is different from a PN sequence of others of the first plurality of subscriber units;

wherein the received signal from each of the second plurality of subscriber units comprises an orthogonal sequence different from an orthogonal sequence of others of the second plurality of subscriber units, the received signal from each of the second plurality of subscriber units having a same PN sequence as the others of the second plurality of subscriber units; and

wherein received signals from the second plurality of subscriber units comprise an orthogonal sequence which is not present in the received signals from the first plurality of subscriber units; and

sending, by the network device, to each subscriber unit of the second plurality of subscriber units, configuration information for use by that subscriber unit in determining the different orthogonal sequence of that subscriber unit.

6. The method of claim 5, further comprising sending, by the network device, to each subscriber unit of the first plurality of subscriber units configuration information for use by that subscriber unit in determining the different PN sequence of that subscriber unit.

7. The method of claim 5 further comprising sending, by the network device, to at least each subscriber unit of the second plurality of subscriber units timing adjustment information.

8. The method of claim 5, wherein the detected orthogonal sequence has a chipping rate less than the PN sequence.

9. A method performed by a subscriber unit for communicating with a network device, wherein the network device is in communication with a first plurality of subscriber units each associated with a pseudo noise (PN) sequence that is different from a PN sequence associated with others of the first plurality of subscriber units, and a second plurality of subscriber units each associated with a common pseudo noise sequence and an orthogonal code that is different from an orthogonal code of others of the second plurality of subscriber units, the method comprising:

transmitting by the subscriber unit a wireless signal in a time interval which includes at least one time slot; and

receiving configuration information for determining the different PN sequence;

wherein the subscriber unit is one of the first plurality of subscriber units;

wherein the wireless signal is generated using a pseudo noise (PN) sequence that is different from the PN sequences of other subscriber units of the first plurality of subscriber units.

10. The method of claim 9, further comprising receiving timing adjustment information.

11. The method of claim 9, wherein the orthogonal sequence has a chipping rate less than the PN sequence.

12. A method performed by a subscriber unit for communicating with a network device, wherein the network device is in communication with a first plurality of subscriber units each associated with a pseudo noise (PN) sequence that is different from a PN sequence of others of the first plurality of subscriber units, and a second plurality of subscriber units each associated with a common pseudo noise sequence and an orthogonal code that is different from an orthogonal code of others of the second plurality of subscriber units, the method comprising:

transmitting by the subscriber unit a wireless signal in a time interval which includes at least one time slot; and

receiving configuration information for determining the different orthogonal sequence;

wherein the subscriber unit is one of the second plurality of subscriber units;

wherein the wireless signal is generated using an orthogonal sequence that is different from an orthogonal sequence of others of the second plurality of subscriber units and a pseudo noise (PN) sequence that is the same as the PN sequences of other subscriber units of the second plurality of subscriber units.

13. The method of claim 12, further comprising receiving timing adjustment information.

14. The method of claim 12, wherein the orthogonal sequence has a chipping rate less than the PN sequence.