Multiple access spread spectrum switching methodology

• US 6,980,531 B1
• Filed: 04/30/1999
• Issued: 12/27/2005
• Est. Priority Date: 12/02/1998
• Status: Expired due to Fees

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Rudrapatna, Ashok N.
• Primary Examiner(s): Duong, Frank
• Application Number:
  US09/302,762
• Time in Patent Office: 2,433 Days
• Field of Search: 370/208, 370/209, 370/320, 370/323, 370/325, 370/335, 370/342, 370/441, 370/217, 370/221, 370/225, 370/226, 375/130, 375/140, 375/141, 375/143, 375/145, 375/146, 375/147, 375/152, 379/221.01
• US Class Current: 370/323
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: H04B 7/18532 Arrangements for managing transmission, i.e. for transporting data or a signalling message
• CPC Class Codes: H04B 7/216 Code division or spread-spectrum multiple access [CDMA, SSMA]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A low-cost, low-power, low-complexity, small, high-reliability, robust, seamless satellite communication network is described. The network performs encoding of a user signal at the customer premises to enable routing of the user signal to an appropriate destination beam at the satellite requiring low power user signal processing. Routing information is embedded at the periphery of the network CPE'"'"'s rather than at the satellite. Embedding the routing information in this way greatly reduces on-board switching complexity and increases signal to interference ratio for the user.

Claims

1. A communication system comprising:

transmission equipment that is assigned to a particular origination path, encodes user signals originating at or near the transmission equipment based on the origination path and a particular destination path, and transmits the encoded user signals on the particular origination path;

switching equipment that receives the encoded user signals on the particular origination path, routes the encoded user signals at a path level, and transmits the encoded user signals on the particular destination path; and

reception equipment that is assigned to the particular destination path, receives the encoded user signals on the particular destination path, and decodes the user signals;

wherein the switching equipment includes a controller that dynamically re-routes the encoded user signals received from the transmission equipment to alternative switching equipment that receives the re-routed, encoded, user signals, routes the re-routed, encoded, user signals at a user level and transmits the re-routed encoded user signals to the reception equipment.

2. A communication system comprising:

transmission equipment that is assigned to a particular origination path, encodes user signals originating at or near the transmission equipment based on the origination path and a particular destination path, and transmits the encoded user signals on the particular origination path;

switching equipment that receives the encoded user signals on the particular origination path, routes the encoded user signals at a path level, and transmits the encoded user signals on the particular destination path; and

reception equipment that is assigned to the particular destination path, receives the encoded user signals on the particular destination path, and decodes the user signals;

wherein the origination or reception equipment is mobile; and

a controller dynamically re-routes the encoded user signals when a total number of origination paths and destination paths used in the system exceed or falls below the number of system users by a predetermined threshold or a predetermined system condition occurs.

3. The system of claim 2, wherein the predetermined system condition affects the effective communication of user signals within the system.

4. A communication method comprising:

assigning transmission equipment to a particular origination path;

encoding user signals based on the origination path and a particular destination path;

transmitting the encoded, user signals on the particular origination path;

receiving the encoded, user signals on the particular origination path;

routing the encoded, user signals at a path level;

transmitting the encoded, user signals on the particular destination path;

receiving the encoded, user signals on the particular destination path; and

decoding the encoded, user signals;

the communication method further comprising;

re-routing the encoded user signals received on the origination path to alternative switching equipment;

receiving the re-routed, encoded, user signals; and

routing the received, re-routed, encoded, user signals at a user level.

5. The method of claim 4, further comprising:

monitoring total number of origination and destination paths and total number of users;

comparing total number of origination and destination paths and total number of users; and

selectively performing re-routing the encoded, user signals to alternative switching equipment based on results produced by the step of comparing.

6. A communication method comprising:

assigning transmission equipment to a particular origination path;

encoding user signals based on the origination path and a particular destination path;

transmitting the encoded, user signals on the particular origination path;

receiving the encoded, user signals on the particular origination path;

routing the encoded, user signals at a path level;

transmitting the encoded, user signals on the particular destination path;

receiving the encoded, user signals on the particular destination path; and

decoding the encoded, user signals;

the method further comprising;

monitoring for occurrence of a predetermined system condition;

selectively re-routing the encoded user signals received on the origination path to alternative switching equipment based on results produced by the step of monitoring;

receiving the re-routed, encoded, user signals; and

routing the received, re-routed, encoded, user signals at a user level.

7. The method of claim 6, wherein the predetermined system condition affects the effective communication of encoded, user signals.