Spread spectrum communication device and spread spectrum communication method
First Claim
1. 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, a base station, including a transmitting unit (15) that transmits transmission power control information to a mobile station, the power control information ctrotg indicating an increase or a decrease in transmission power; and
the mobile station, including a receiving unit (25) configured to receive said transmission power control information indicating an increase or a decrease in power from the mcblc base station, an interleaving unit (13) configured to perform interleaving in bit units on a frame, a compressing unit (14) configured to compress a frame so as to produce a compressed frame in compressed mode, a transmitting unit (15) configured to transmit frames, and a control unit (11) configured to control said interleaving unit (13), said compressing unit (14), and said transmitting unit (15);
characterized in that said interleaving unit (13), said compressing unit (14), and said transmitting unit (15) are configured to be controlled so as to provide 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, in order 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, adjust 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 transmit the uncompressed or 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.
55 Citations
4 Claims
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1. 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,
a base station, including a transmitting unit (15) that transmits transmission power control information to a mobile station, the power control information ctrotg indicating an increase or a decrease in transmission power; and
the mobile station, including a receiving unit (25) configured to receive said transmission power control information indicating an increase or a decrease in power from the mcblc base station, an interleaving unit (13) configured to perform interleaving in bit units on a frame, a compressing unit (14) configured to compress a frame so as to produce a compressed frame in compressed mode, a transmitting unit (15) configured to transmit frames, and a control unit (11) configured to control said interleaving unit (13), said compressing unit (14), and said transmitting unit (15);
characterized in that said interleaving unit (13), said compressing unit (14), and said transmitting unit (15) are configured to be controlled so as to provide 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, in order 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, adjust 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 transmit the uncompressed or 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 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,
a mobile station, including a transmitting unit (15) that transmits transmission power control information to a base station, the power control information indicating an increase or a decrease in transmission power; and
the base station, including a receiving unit (25) configured to receive said transmission power control information indicating an increase or a decrease in power from the mobile station, an interleaving unit (13) configured to perform interleaving in bit units on a frame, a compressing unit (14) configured to compress a frame so as to produce a compressed frame in compressed mode, a transmitting unit (15) configured to transmit frames, and a control unit (11) configured to control said interleaving unit (13), said compressing unit (14), and said transmitting unit (15);
characterized in that said interleaving unit (13), said compressing unit (14), and said transmitting unit (15) are configured to be controlled so as to provide 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, in order 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, adjust 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 transmit the uncompressed or 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 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,
a receiving unit (25) configured to receive transmission power control information indicating an increase or a decrease in power from a mobile station, an interleaving unit (13) configured to perform interleaving in bit units on a frame, a compressing unit (14) configured to compress a frame so as to produce a compressed frame in compressed mode, a transmitting unit (15) configured to transmit frames, and a control unit (11) configured to control said interleaving unit (13), said compressing unit (14), and said transmitting unit (15);
characterized in that said interleaving unit (13), said compressing unit (14), and said transmitting unit (15) are configured to be controlled so as to provide 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, adjust 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 transmit the uncompressed or 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 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,
a receiving unit (25) configured to receive transmission power control information indicating an increase or a decrease in power from a base station, an interleaving unit (13) configured to perform interleaving in bit units on a frame, a compressing unit (14) configured to compress an interleaved frame so as to produce a compressed frame in compressed mode, a transmitting unit (15) configured to transmit frames, and a control unit (11) configured to control said interleaving unit (13), said compressing unit (14), and said transmitting unit (15);
characterized in that said interleaving unit (13), said compressing unit (14), and said transmitting unit (15) are configured to be controlled so as to provide 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, in order 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, adjust 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 transmit the uncompressed or compressed frames in accordance with the adjusted transmission power.
- and intermittently transmitting compressed frames in a compressed mode, comprising,
Specification