System and method for maintaining wireless channels over a reverse link of a CDMA wireless communication system

• US 8,792,458 B2
• Filed: 03/19/2012
• Issued: 07/29/2014
• Est. Priority Date: 06/01/1998
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Proctor, James A. Jr.
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): LEE, ANDREW CHUNG CHEUNG
• Application Number:
  US13/423,859
• Publication Number:
  US 20130201962A1
• Time in Patent Office: 862 Days
• Field of Search: 370/329, 370/333, 370/334, 370/335, 370/342, 370/465, 455/60, 455/70, 455/436, 455/453, 455/455, 455/522
• US Class Current: 370/335
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04B 1/70754 Setting of search window, i.e. range of code offsets to be searched H04B1/70758 takes precedence
• CPC Class Codes: H04B 2001/70706 using a code tracking loop, e.g. a delay locked loop
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 2201/70709 with discontinuous detection
• CPC Class Codes: H04B 2201/70715 with application-specific features
• 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: H04J 13/0022 PN, e.g. Kronecker
• CPC Class Codes: H04J 13/004 Orthogonal
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04J 13/18 Allocation of orthogonal codes
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/165 Variable formats
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 25/14 Channel dividing arrangements , i.e. in which a single bit stream is divided between several baseband channels and reassembled at the receiver
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 7/06 the synchronisation signals differing from the information signals in amplitude, polarity or frequency or length
• CPC Class Codes: H04Q 11/0428 Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13202 Network termination [NT]
• CPC Class Codes: H04Q 2213/13204 : Protocols
• CPC Class Codes: H04Q 2213/13209 : ISDN
• CPC Class Codes: H04Q 2213/13216 : Code signals, frame structure
• CPC Class Codes: H04Q 2213/1327 : Release and resetting of connection
• CPC Class Codes: H04Q 2213/13298 : Local loop systems, access network
• CPC Class Codes: H04Q 2213/13332 : Broadband, CATV, dynamic bandwidth allocation
• CPC Class Codes: H04Q 2213/1336 : Synchronisation
• CPC Class Codes: H04Q 2213/13389 : LAN, internet
• CPC Class Codes: H04W 24/00 : Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/20 : Negotiating bandwidth
• CPC Class Codes: H04W 28/22 : Negotiating communication rate
• CPC Class Codes: H04W 56/00 : Synchronisation arrangements
• CPC Class Codes: H04W 56/0045 : compensating for timing error by altering transmission time
• CPC Class Codes: H04W 56/0075 : based on arrival time vs. expected arrival time
• 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 72/0466 : the resource being a scrambling code
• CPC Class Codes: H04W 72/21 : in the uplink direction of a wireless link, i.e. towards the network
• 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 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 84/14 : WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

A subscriber access unit includes a transceiver for providing wireless communication of digital signals. The digital signals are communicated to a base station using at least one radio frequency (RF) channel via Code Division Multiple Access (CDMA) modulated radio signals defined by orthogonal codes. Orthogonal subchannels are made available by the base station within each CDMA RF channel. A bandwidth manager is connected to the transceiver, and when the transceiver is actively sending data, at least one orthogonal subchannel is allocated by the base station on an as-needed basis. The number of orthogonal subchannels being allocated changes during a given session. The transceiver, when powered on but not actively sending data, provides an idling mode connection on a reverse link. The idling mode connection is based on an orthogonal subchannel shared with at least one other subscriber access unit, but utilizes different time slots of the shared orthogonal subchannel.

Claims

1. A subscriber unit comprising:

a transceiver configured to receive time interval assignment information;

wherein the time interval assignment information indicates time intervals for reverse link transmission;

wherein each time interval includes at least one time slot;

wherein the transceiver is further configured to transmit over a plurality of code channels in all time intervals when data is available to transmit; and

wherein the transceiver is further configured to transmit a code channel, having a burst pattern over the reverse link, in at least one time interval and not transmit any code channels in other time intervals when no data is available to transmit to maintain a reverse link so that synchronization of subchannels does not need to be reestablished each time forward link channels are granted back.

2. The subscriber unit of claim 1 wherein the transceiver is further configured on a condition that the transceiver is transmitting the code channel having the burst pattern and the subscriber unit has data to transmit, to transmit over a plurality of code channels.

3. The subscriber unit of claim 1 wherein the code channel transmitted having the burst pattern is a single code channel.

4. The subscriber unit of claim 1 wherein the transceiver is configured to receive forward link data in time intervals over a plurality of code channels.

5. The subscriber unit of claim 1 wherein on a condition that a data buffer has no data to transmit and the data buffer receives data to transmit, the transceiver is further configured to transmit a message to a base station;

wherein the transceiver is further configured to receive a grant in response to the transmitted message.

6. The subscriber unit of claim 5 wherein a number of the plurality of code channels used to transmit is derived from the grant.

7. The subscriber unit of claim 1 wherein the code channel having the burst pattern is derived from at least one pseudonoise (PN) code.

8. A method comprising:

receiving, by a subscriber unit, time interval assignment information;

wherein the time interval assignment information indicates time intervals for reverse link transmission;

wherein each time interval includes at least one time slot;

transmitting, by the subscriber unit, over a plurality of code channels in all time intervals when data is available to transmit; and

transmitting, by the subscriber unit, a code channel, having a burst pattern over the reverse link, in at least one time interval and not transmit any code channels in other time intervals when no data is available to transmit to maintain a reverse link so that synchronization of subchannels does not need to be reestablished each time forward link channels are granted back.

9. The method of claim 8 further comprising on a condition that the subscriber unit is transmitting the code channel having the burst pattern and the subscriber unit has data to transmit, transmitting, by the subscriber unit, over a plurality of code channels.

10. The method of claim 8 wherein the code channel transmitted having the burst pattern is a single code channel.

11. The method of claim 8 further comprising receiving forward link data in time intervals over a plurality of code channels.

12. The method of claim 8 wherein on a condition that a data buffer has no data to transmit and the data buffer receives data to transmit, transmitting, by the subscriber unit, a message to a base station;

in response to the transmitted message, receiving, by the subscriber unit, a grant.

13. The method of claim 12 wherein a number of the plurality of code channels used to transmit is derived from the grant.

14. The method of claim 8 wherein the code channel having the burst pattern is derived from at least one pseudonoise (PN) code.

15. A wireless network device comprising:

a transceiver configured to receive time interval assignment information;

wherein the time interval assignment information indicates time intervals for reverse link transmission;

wherein each time interval includes at least one time slot;

wherein the transceiver is further configured to transmit over a plurality of code channels in all time intervals when data is available to transmit; and

wherein the transceiver is further configured to transmit a code channel, having a burst pattern over the reverse link, in at least one time interval and not transmit any code channels in other time intervals when no data is available to transmit to maintain a reverse link so that synchronization of subchannels does not need to be reestablished each time forward link channels are granted back.

16. The wireless network device of claim 15 wherein the network device is component of a base station.

17. The wireless network device of claim 15 wherein the transceiver is further configured on a condition that the subscriber unit was transmitting the code channel having the burst pattern and the subscriber unit has data to transmit, to receive over a plurality of code channels.

18. The wireless network device of claim 15 wherein the code channel transmitted having the burst pattern is a single code channel.

19. The wireless network device of claim 15 wherein the transceiver is configured to transmit forward link data in time intervals over a plurality of code channels to the subscriber unit.

20. The wireless network device of claim 15 wherein the code channel having the burst pattern was derived from at least one pseudonoise (PN) code.