Bandwidth allocation and data multiplexing scheme for direct sequence CDMA systems

• US 7,054,286 B2
• Filed: 04/09/2001
• Issued: 05/30/2006
• Est. Priority Date: 10/27/2000
• Status: Expired due to Fees

• Current Assignee: L-3 Communications Corporation (L3Harris Technologies, Inc.)
• Original Assignee: L-3 Communications Corporation (L3Harris Technologies, Inc.)
• Inventors: Hall, Eric K., Giallorenzi, Thomas R., Harris, Johnny M., Ertel, Richard B., Stephenson, Philip L., Newren, Edward P.
• Primary Examiner(s): Kizcj, Hassan
• Assistant Examiner(s): PIZARRO, RICARDO M
• Application Number:
  US09/829,092
• Publication Number:
  US 20020051462A1
• Time in Patent Office: 1,877 Days
• Field of Search: 370/335, 370/329, 370/342, 370/431, 370/437, 370/468, 370/441, 370/330, 370/319, 370/522, 370/353, 375/130, 375/161, 455/517, 455/503, 455/450
• US Class Current: 370/329
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• 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

Abstract

This invention provides a highly flexible multiplexing scheme for Direct Sequence CDMA systems enabling the CDMA system to flexibly allocate CDMA channel resources between packet-switched broadcast channels and fast-circuit-switched dedicated channels in order to optimize system throughput. A method and system are provided for operating a communication system. The method has steps of: flexibly allocating CDMA channel resources between packet-switched broadcast channels and fast-circuit-switched dedicated channels in order to optimize system throughput, and employing a side channel as required to send all or a part of a total amount of data, depending on the total amount of the data. A bandwidth allocation scheme allocates a set of CDMA channels for burst packet-switched channels, and data is time division multiplexed over the set of burst CDMA channels providing a wide bandwidth data pipe for packet-switched data. Subscriber stations are equipped with multiple CDMA channel receivers tuned to the burst CDMA channels.

Claims

1. A synchronous Code Division Multiple Access (CDMA) communication system wherein a base site (BS) communicates with subscriber stations (SSs) through a radio channel, comprising:

a BS channel allocation control unit for allocating radio channel bandwidth to include a set of shared forward link CDMA channels for use as burst packet-switched channels, wherein data is time division multiplexed over the burst packet-switched channels to a plurality of said SSs;

further comprising multiple CDMA burst packet-switched channel receivers at individual ones of said plurality of SSs for receiving said data from said burst packet-switched channels,

said BS channel allocation control unit further allocating, as required, other CDMA channels for circuit-switched connections to particular ones of said SSs;

and further comprising a side CDMA channel for making channel requests and for sending all or a part of a total amount of data, depending on the total amount of the data.

2. A synchronous CDMA communication system as in claim 1, wherein for a SS that has data to transmit to the BS, the SS transmits an indication to the BS that the SS has data to be transmitted, along with the data.

3. A synchronous CDMA communication system as in claim 1, wherein said BS channel allocation control unit further allocates a set of shared reverse link CDMA channels for use as reverse burst packet-switched channels that are used in a contention mode by a number of said SSs.

4. A synchronous CDMA communication system as in claim 1, wherein said BS channel allocation control unit further allocates a set of shared reverse link CDMA channels for use as reverse burst packet-switched channels that are used in a slotted Aloha fashion by a number of said SSs.

5. A synchronous CDMA communication system as in claim 1, wherein said BS channel allocation control unit further allocates a set of shared reverse link CDMA channels for use as reverse burst packet-switched channels, and wherein individual ones of said S Ss further comprise multiple CDMA burst packet-switched channel transmitters that are used in a contention mode by a number of said SSs to transmit channel requests alone, channel requests along with data, or data alone to said BS.

6. A synchronous CDMA communication system as in claim 1, wherein at least two of said SSs are assigned to a same forward link data side channel, and where packet multiplexing is used to transmit data packets from the BS to individual ones of at least two of said SSs.

7. A synchronous CDMA communication system as in claim 1, wherein said BS channel allocation control unit allocates said radio channel bandwidth under control of a network operator.

8. A synchronous CDMA communication system as in claim 1, wherein said BS channel allocation control unit allocates said radio channel bandwidth automatically in response to demand.