Spread spectrum communication device and spread spectrum communication method
First Claim
1. 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 indicating an increase or a decrease in transmission power; and
the mobile station, including 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 in normal mode and in compressed mode, 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 compressing unit (14), said interleaving unit (13) and said transmitting unit (15);
characterized in that said compressing unit (14), said interleaving unit (13) and said transmitting unit (15) are configured to be controlled so as to provide an idle period used to observe other frequency career, by dividing the interleaved and compressed frame into a first portion including front edge of a frame window and a second portion including rear edge of the frame window, the frame window being the same as a frame window in the normal mode, adjust transmission power in the normal mode and the compressed mode in accordance with the transmission power control information received by the receiving unit (25);
by increasing or decreasing current power with a power control step size for the normal mode and with a plurality of power control step sizes for the compressed mode, said plurality including at least one power control step size larger than said power control step size for the normal mode, and transmit the 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.
45 Citations
4 Claims
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1. 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 indicating an increase or a decrease in transmission power; and
the mobile station, including 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 in normal mode and in compressed mode, 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 compressing unit (14), said interleaving unit (13) and said transmitting unit (15);
characterized in that said compressing unit (14), said interleaving unit (13) and said transmitting unit (15) are configured to be controlled so as to provide an idle period used to observe other frequency career, by dividing the interleaved and compressed frame into a first portion including front edge of a frame window and a second portion including rear edge of the frame window, the frame window being the same as a frame window in the normal mode, adjust transmission power in the normal mode and the compressed mode in accordance with the transmission power control information received by the receiving unit (25);
by increasing or decreasing current power with a power control step size for the normal mode and with a plurality of power control step sizes for the compressed mode, said plurality including at least one power control step size larger than said power control step size for the normal mode,and transmit the frames in accordance with the adjusted transmission power.
- and intermittently transmitting compressed frames in a compressed mode, comprising,
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2. 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 mobile station, the power control information indicating an increase or a decrease in transmission power; and
the mobile station, including 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 in normal mode and in compressed mode, 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 compressing unit (14), said interleaving unit (13) and said transmitting unit (15);
characterized in that said compressing unit (14), said interleaving unit (13) and said transmitting unit (15) are configured to be controlled so as to provide an idle period used to observe other frequency career, by dividing the interleaved and compressed frame into a first portion including front edge of a frame window and a second portion including rear edge of the frame window, the frame window being the same as a frame window in the normal mode, adjust transmission power in the normal mode and the compressed mode in accordance with the transmission power control information received by the receiving unit (25);
by increasing or decreasing current power with a power control step size for the normal mode and with a plurality of power control step sizes for the compressed mode, said plurality including at least one power control step size larger than said power control step size for the normal mode,and transmit the 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 in normal mode and in compressed mode, 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 compressing unit (14), said interleaving unit (13) and said transmitting unit (15);
characterized in that said compressing unit (14), said interleaving unit (13) and said transmitting unit (15) are configured to be controlled so as to provide an idle period used to observe other frequency career, by dividing the interleaved and compressed frame into a first portion including front edge of a frame window and a second portion including rear edge of the frame window, the frame window being the same as a frame window in the normal mode, adjust transmission power in the normal mode and the compressed mode in accordance with the transmission power control information received by the receiving unit (25);
by increasing or decreasing current power with a power control step size for the normal mode and with a plurality of power control step sizes for the compressed mode, said plurality including at least one power control step size larger than said power control step size for the normal mode,and transmit the 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 in normal mode and in compressed mode, 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 compressing unit (14), said interleaving unit (13) and said transmitting unit (15);
characterized in that said compressing unit (14), said interleaving unit (13) and said transmitting unit (15) are configured to be controlled so as to provide an idle period used to observe other frequency career, by dividing the interleaved and compressed frame into a first portion including front edge of a frame window and a second portion including rear edge of the frame window, the frame window being the same as a frame window in the normal mode, adjust transmission power in the normal mode and the compressed mode in accordance with the transmission power control information received by the receiving unit (25);
by increasing or decreasing current power with a power control step size for the normal mode and with a plurality of power control step sizes for the compressed mode, said plurality including at least one power control step size larger than said power control step size for the normal mode,and transmit the frames in accordance with the adjusted transmission power.
- and intermittently transmitting compressed frames in a compressed mode, comprising,
Specification