Spread spectrum communication device and spread spectrum communication method
First Claim
1. A spread spectrum communication method applied to a mobile communication system in a code division multiple access system continuously transmitting uncompressed frames in a normal mode;
- and intermittently transmitting compressed frames in a compressed mode, comprising, at a base station, transmitting transmission power control information indicating an increase or a decrease in power to a mobile station;
at a mobile station, receiving transmission power control information indicating an increase or a decrease in power from a base station, compressing a frame so as to produce a compressed frame in a compressed mode, performing interleaving in bit units on an uncompressed frame and on the compressed frame, dividing the compressed frame into a front portion of a frame window and a rear portion separated from the front portion, where said front portion has a front edge of a frame window and said rear portion has a rear edge of said frame window, adjusting transmission power on the uncompressed and compressed frames in accordance with the transmission power control information, by increasing or decreasing current power with a power control step size for the uncompressed frame and with a plurality of power control step sizes for the compressed frames.
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Abstract
In a compressed mode, a spread spectrum communication device interleaves bit units across multiple frames using an interleaver, reduces the spreading factor using a framing/spreading unit, outputs the compressed mode frames at a predetermined compressed mode frame timing, and increases the average transmission power in the compressed mode at a radio frequency transmitter. Furthermore, a handover between different frequencies is carried out by establishing synchronization to another frequency carrier, based on a first search code and a second search code which have been detected, and moreover, a handover between different communication systems is carried out by establishing synchronization to a GSM, based on an FCCH and a SCH which have been detected.
25 Citations
4 Claims
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1. A spread spectrum communication method applied to a mobile communication system in a code division multiple access system continuously transmitting uncompressed frames in a normal mode;
- and intermittently transmitting compressed frames in a compressed mode, comprising,
at a base station, transmitting transmission power control information indicating an increase or a decrease in power to a mobile station;
at a mobile station, receiving transmission power control information indicating an increase or a decrease in power from a base station, compressing a frame so as to produce a compressed frame in a compressed mode, performing interleaving in bit units on an uncompressed frame and on the compressed frame, dividing the compressed frame into a front portion of a frame window and a rear portion separated from the front portion, where said front portion has a front edge of a frame window and said rear portion has a rear edge of said frame window, adjusting transmission power on the uncompressed and compressed frames in accordance with the transmission power control information, by increasing or decreasing current power with a power control step size for the uncompressed frame and with a plurality of power control step sizes for the compressed frames.
- and intermittently transmitting compressed frames in a compressed mode, comprising,
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2. A spread spectrum communication method applied to a mobile communication system in a code division multiple access system continuously transmitting uncompressed frames in a normal mode;
- and intermittently transmitting compressed frames in a compressed mode, comprising,
at a mobile station, transmitting transmission power control information indicating an increase or a decrease in power to a base station;
at a base station, receiving transmission power control information indicating an increase or a decrease in power from a mobile station, compressing a frame so as to produce a compressed frame in a compressed mode, performing interleaving in bit units on an uncompressed frame and on the compressed frame, dividing the compressed frame into a front portion of a frame window and a rear portion separated from the front portion, where said front portion has a front edge of a frame window and said rear portion has a rear edge of said frame window, adjusting transmission power on the uncompressed and compressed frames in accordance with the transmission power control information, by increasing or decreasing current power with a power control step size for the uncompressed frame and with a plurality of power control step sizes for the compressed frames.
- and intermittently transmitting compressed frames in a compressed mode, comprising,
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3. A spread spectrum communication method applied to a base station in a code division multiple access system continuously transmitting uncompressed frames in a normal mode;
- and intermittently transmitting compressed frames in a compressed mode, comprising,
receiving transmission power control information indicating an increase or a decrease in power from a mobile station, compressing a frame so as to produce a compressed frame in a compressed mode, performing interleaving in bit units on an uncompressed frame and on the compressed frame, dividing the compressed frame into a front portion of a frame window and a rear portion separated from the front portion, where said front portion has a front edge of a frame window and said rear portion has a rear edge of said frame window, adjusting transmission power on the uncompressed and compressed frames in accordance with the transmission power control information, by increasing or decreasing current power with a power control step size for the uncompressed frame and with a plurality of power control step sizes for the compressed frames.
- and intermittently transmitting compressed frames in a compressed mode, comprising,
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4. A spread spectrum communication method applied to a mobile station in a code division multiple access system continuously transmitting uncompressed frames in a normal mode;
- and intermittently transmitting compressed frames in a compressed mode, comprising,
receiving transmission power control information indicating an increase or a decrease in power from a base station, compressing a frame so as to produce a compressed frame in a compressed mode, performing interleaving in bit units on an uncompressed frame and on the compressed frame, dividing the compressed frame into a front portion of a frame window and a rear portion separated from the front portion, where said front portion has a front edge of a frame window and said rear portion has a rear edge of said frame window, adjusting transmission power on the uncompressed and compressed frames in accordance with the transmission power control information, by increasing or decreasing current power with a power control step size for the uncompressed frame and with a plurality of power control step sizes for the compressed frames.
- and intermittently transmitting compressed frames in a compressed mode, comprising,
Specification