Radio communication system, radio communication apparatus and radio communication method, and computer program
First Claim
1. A radio communication system having a multi-cell multi-user structure, comprising:
- a plurality of base stations in respective adjacent or neighboring cells, wherein the respective base stations are capable of communicating and share a channel on a space, time, and/or frequency basis;
wherein each base station that has a multi-user detection function determines that a first mobile station outside a local cell thereof approaches a boundary with a neighboring cell based on detection of a transmitted signal from the first mobile station for identifying a user, and said base station mixes and synthesizes a synthesized signal including user data for a second mobile station within the local cell and control information for the first mobile station outside the local cell and outputs the synthesized signal at a frequency;
wherein the multi-user detection function applies a successive interference cancellation technique to distinguish a first signal transmitted at the frequency by the first mobile station from a second signal transmitted at the same frequency by the second mobile station,the synthesized signal being used to perform a handoff of the first mobile station from a base station corresponding to the neighboring cell to the base station corresponding to the local cell without conducting any communication other than communication with a mobile station.
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Accused Products
Abstract
A radio communication network that requires no connection between base stations during handoff or when the cell is overloaded, is realized by using a receiver that has a multi-user detection function and a transmitter for synthesizing control information and user data to output the synthesized data. Upon reception of a signal that is transmitted from a mobile station located on the boundary with a neighboring cell, the base station synthesizes user data for a mobile station in its local cell and control information for controlling the handoff operation to transmit the synthesized data. In response to this transmission, a mobile station in the neighboring cell separates the control information by multi-user detection to detect the signal and transmits a handoff request to the base station.
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Citations
14 Claims
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1. A radio communication system having a multi-cell multi-user structure, comprising:
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a plurality of base stations in respective adjacent or neighboring cells, wherein the respective base stations are capable of communicating and share a channel on a space, time, and/or frequency basis; wherein each base station that has a multi-user detection function determines that a first mobile station outside a local cell thereof approaches a boundary with a neighboring cell based on detection of a transmitted signal from the first mobile station for identifying a user, and said base station mixes and synthesizes a synthesized signal including user data for a second mobile station within the local cell and control information for the first mobile station outside the local cell and outputs the synthesized signal at a frequency; wherein the multi-user detection function applies a successive interference cancellation technique to distinguish a first signal transmitted at the frequency by the first mobile station from a second signal transmitted at the same frequency by the second mobile station, the synthesized signal being used to perform a handoff of the first mobile station from a base station corresponding to the neighboring cell to the base station corresponding to the local cell without conducting any communication other than communication with a mobile station. - View Dependent Claims (2, 4)
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3. A radio communication system having a multi-cell multi-user structure in which cells where the respective base stations are capable of communicating and share a channel on a space, time, and/or frequency basis;
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wherein a mobile station that has a multi-user detection function determines that the mobile station approaches a boundary with a neighboring cell based on detection of a transmitted signal from a base station outside a local cell thereof for identifying a user, and mixes and produces a synthesized signal including user data for the base station within the local cell and control information for the base station in the neighboring cell and outputs the synthesized signal at a frequency; wherein the multi-user detection function applies a successive interference cancellation technique to distinguish transmitted signals having the same frequency from the base station within the local cell and the base station outside the local cell, the synthesized signal being used to perform a handoff of the mobile station from the base station corresponding to the local cell to the base station corresponding to the neighboring cell without conducting any communication other than communication with a mobile station.
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5. A radio communication apparatus operating in a radio communication environment that has a multi-cell multi-user structure in which cells where the respective base stations are capable of communicating share a channel on a space, time, and/or frequency basis;
- the radio communication apparatus comprising;
multi-user detection means for detecting a plurality of received signals as desired signals; and multiple-signal transmission means for mixing and producing a synthesized signal from a signal for a station within a local cell and a signal for a station outside the local cell in response to the detection of a transmitted signal from the station outside the local cell for identifying a user by the multi-user detection means and outputting the synthesized signal at a frequency; wherein the multi-user detection means applies a successive interference cancellation technique to distinguish signals having the same frequency for the station within the local cell and the station outside the local cell, the synthesized signal being used to perform a handoff of a mobile station between a base station within the local cell and a base station outside the local cell without conducting any communication other than communication with a mobile station. - View Dependent Claims (6, 7, 8, 9)
- the radio communication apparatus comprising;
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10. A radio communication method in a radio communication environment that has a multi-cell multi-user structure in which cells where the respective base stations are capable of communicating share a channel on a space, time, and/or frequency basis;
- the radio communication method comprising;
a multi-user detection step for detecting a plurality of received signals as desired signals; and a multiple-signal transmission step for mixing and producing a synthesized signal at a frequency from a signal for a station within a local cell and a signal for a station outside the local cell and outputting the synthesized signal in response to a detection of a transmitted signal from the station outside the local cell for identifying a user in the multi-user detection step; wherein the multi-user detection step applies a successive interference cancellation technique to distinguish signals having the same frequency for the station within the local cell and the station outside the local cell, the synthesized signal being used to perform a handoff of a mobile station between a base station within the local cell and a base station outside the local cell without conducting any communication other than communication with a mobile station. - View Dependent Claims (11, 12, 13, 14)
- the radio communication method comprising;
Specification