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

• US 8,139,546 B2
• Filed: 04/27/2010
• Issued: 03/20/2012
• Est. Priority Date: 06/01/1998
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Inventors: Proctor, James A. Jr.
• Primary Examiner(s): Nguyen, Brian D
• Application Number:
  US12/768,445
• Publication Number:
  US 20100208708A1
• Time in Patent Office: 693 Days
• Field of Search: 370/335, 370/329, 370/342, 370/350, 370/441
• 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 establish a communication link with a base station;

wherein the transceiver is further configured to transmit data to the base station over a plurality of code division multiple access (CDMA) channels in all time intervals;

wherein a time interval includes at least one time slot;

wherein the transceiver is further configured to receive time interval assignment; and

wherein the transceiver is further configured, in response to receiving time interval assignment, to transmit a single CDMA channel, having a burst pattern, in at least one time interval and not transmit any CDMA channels in other time intervals.

2. The subscriber unit as in claim 1 wherein the transceiver is further configured, in response to not receiving the time interval assignment, to transmit the plurality of CDMA channels in all time intervals.

3. The subscriber unit as in claim 1 wherein a number of the CDMA channels used to transmit the data varies.

4. The subscriber unit as in claim 1 wherein the plurality of CDMA channels and the single CDMA channel are derived from at least one pseudonoise (PN) code.

5. The subscriber unit as in claim 1 wherein the burst pattern is transmitted using a minimum set of time intervals in which the transceiver transmits the burst pattern to maintain synchronization.

6. A method comprising:

establishing by a subscriber unit a communication link with a base station;

transmitting by the subscriber unit data to the base station over a plurality of code division multiple access (CDMA) channels in all time intervals;

wherein a time interval includes at least one time slot;

receiving by the subscriber unit time interval assignment; and

transmitting by the subscriber unit, in response to the time interval assignment, a single CDMA channel, having a burst pattern, in at least one time interval and not transmit any CDMA channels in other time intervals.

7. The method as in claim 6 wherein in response to not receiving time interval assignment, transmitting by the subscriber unit the plurality of CDMA channels in all time intervals.

8. The method as in claim 6 wherein a number of the CDMA channels used to transmit the data varies.

9. The method as in claim 6 wherein the plurality of CDMA channels and the single CDMA channel are derived from at least one pseudonoise (PN) code.

10. The method as in claim 6 wherein the burst pattern is transmitted in a minimum set of time intervals in which the transceiver transmits the burst pattern to maintain synchronization.

11. A base station comprising:

a transceiver configured to establish a communication link with a subscriber unit;

wherein the transceiver further is configured to receive data over a plurality of code division multiple access (CDMA) channels from the subscriber unit in all time intervals;

wherein a time interval includes at least one time slot;

wherein the transceiver is further configured to transmit time interval assignment; and

wherein the transceiver is further configured to receive, in response to transmitting the time interval assignment, a single CDMA channel, having a burst pattern, in at least one time interval and not receiving any CDMA channels in other time intervals from the subscriber unit.

12. The base station as in claim 11 wherein the transceiver is further configured, in response to not transmitting the time interval assignment, to receive the plurality of CDMA channels in all time intervals.

13. The base station as in claim 11 wherein a number of the CDMA channels used to receive the data varies.

14. The base station as in claim 11 wherein the plurality of CDMA channels and the single CDMA channel are derived from at least one pseudonoise (PN) code.

15. The base station as in claim 11 wherein the burst pattern is received in a minimum set of time intervals to maintain synchronization with the subscriber unit.