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, performing interleaving in bit units on a frame, compressing an interleaved frame so as to produce a compressed frame in compressed mode, providing an idle period in which a frame is not transmitted and which is used to observe other frequency career, by dividing the compressed frame into a front portion of a frame window and a rear portion separated from the front portion, so as to produce a divided frame in which 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 frames in normal mode and compressed frames in compressed mode in accordance with the transmission power control information, by increasing or decreasing current transmission-power with one of a (first) plurality of power control step size for the normal mode and with one of a (second) plurality of power control step sizes for the compressed mode, and transmitting the uncompressed and compressed frames in accordance with the adjusted transmission power.
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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.
39 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, performing interleaving in bit units on a frame, compressing an interleaved frame so as to produce a compressed frame in compressed mode, providing an idle period in which a frame is not transmitted and which is used to observe other frequency career, by dividing the compressed frame into a front portion of a frame window and a rear portion separated from the front portion, so as to produce a divided frame in which 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 frames in normal mode and compressed frames in compressed mode in accordance with the transmission power control information, by increasing or decreasing current transmission-power with one of a (first) plurality of power control step size for the normal mode and with one of a (second) plurality of power control step sizes for the compressed mode, and transmitting the uncompressed and compressed frames in accordance with the adjusted transmission power.
- 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 mobile station;
at a base station, receiving transmission power control information indicating an increase or a decrease in power from a mobile station, performing interleaving in bit units on a frame, compressing an interleaved frame so as to produce a compressed frame in compressed mode, providing an idle period in which a frame is not transmitted and which is used to observe other frequency career, by dividing the compressed frame into a front portion of a frame window and a rear portion separated from the front portion, so as to produce a divided frame in which 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 frames in normal mode and compressed frames in compressed mode in accordance with the transmission power control information, by increasing or decreasing current transmission power with one of a (first) plurality of power control step size for the normal mode and with one of a (second) plurality of power control step sizes for the compressed mode, and transmitting the uncompressed and compressed frames in accordance with the adjusted transmission power.
- 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, performing interleaving in bit units on a frame, compressing an interleaved frame so as to produce a compressed frame in compressed mode, providing an idle period in which a frame is not transmitted and which is used to observe other frequency career, by dividing the compressed frame into a front portion of a frame window and a rear portion separated from the front portion, so as to produce a divided frame in which 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 frames in normal mode and compressed frames in compressed mode in accordance with the transmission power control information, by increasing or decreasing current transmission power with one of a (first) plurality of power control step size for the normal mode and with one of a (second) plurality of power control step sizes for the compressed mode, and transmitting the uncompressed and compressed frames in accordance with the adjusted transmission power.
- 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, performing interleaving in bit units on a frame compressing an interleaved frame so as to produce a compressed frame in compressed mode, providing an idle period in which a frame is not transmitted and which is used to observe other frequency career, by dividing the compressed frame into a front portion of a frame window and a rear portion separated from the front portion, so as to produce a divided frame in which 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 frames in normal mode and compressed frames in compressed mode in accordance with the transmission power control information, by increasing or decreasing current transmission power with one of a (first) plurality of power control step size for the normal mode and with one of a (second) plurality of power control step sizes for the compressed mode, and transmitting the uncompressed and compressed frames in accordance with the adjusted transmission power.
- and intermittently transmitting compressed frames in a compressed mode, comprising,
Specification