Base station apparatuses, terminal unit, radio communication system having those apparatuses, and program to be executed by the base stations
First Claim
1. A base station apparatus that performs main normal transmission if a communication-target terminal unit exists in the cell thereof and that can perform cooperative transmission when the communication-target terminal unit exists in another cell, the base station apparatus comprising:
- a reference signal ID code determining means that determines the ID code of a reference signal specific to the terminal unit;
a reference signal generating means that generates the reference signal based on the determined ID code; and
,a transmitting means that transmits a signal including the reference signal,wherein the reference signal generating means generates a reference signal for cooperative transmission to be used when the communication-target terminal unit exists in a cooperative transmission cell such as to be different from the reference signal for main transmission that is used by the base station apparatus for performing main transmission, andthe transmitting means transmits the generated reference signal for cooperative transmission to the terminal.
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Accused Products
Abstract
The present invention is to enable reduction of constraint brought by generation of ID codes of reference signals to be used for cooperative reception and the allocation of the reference signals when radio communication is carried out between a plurality of base station apparatuses and a terminal unit.
Terminal units UE201 to UE205 are terminal units existing in the cellular zone of a base station apparatus BS200 and are performing communication with base station apparatus UE200. When terminal unit UE201 is located at the edge of cell and its reception characteristic degrades, another base station apparatus, specifically, base station apparatus BS100 also performs cooperative transmission while terminal unit UE201 performs cooperative reception. In this case, in order to demodulate the signal from base station apparatus BS100, an ID code of a reference signal that is different from the reference signal the terminal unit uses to demodulate the signal from a solo base station apparatus is used as the ID code of the reference signal that is transmitted from base station apparatus BS100 and specific to the terminal unit.
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Citations
18 Claims
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1. A base station apparatus that performs main normal transmission if a communication-target terminal unit exists in the cell thereof and that can perform cooperative transmission when the communication-target terminal unit exists in another cell, the base station apparatus comprising:
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a reference signal ID code determining means that determines the ID code of a reference signal specific to the terminal unit; a reference signal generating means that generates the reference signal based on the determined ID code; and
,a transmitting means that transmits a signal including the reference signal, wherein the reference signal generating means generates a reference signal for cooperative transmission to be used when the communication-target terminal unit exists in a cooperative transmission cell such as to be different from the reference signal for main transmission that is used by the base station apparatus for performing main transmission, and the transmitting means transmits the generated reference signal for cooperative transmission to the terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A program that can be loaded into, and executed by, a base station apparatus that performs main normal transmission if a communication-target terminal unit exists in the cell thereof and that can perform cooperative transmission when the communication-target terminal unit exists in another cell, causing the base station apparatus to function as
a reference signal ID code determining means that determines the ID code of a reference signal specific to the terminal unit; -
a reference signal generating means that generates the reference signal based on the determined ID code, and, characterized in that the reference signal generating means generates a reference signal for cooperative transmission to be used when the communication-target terminal unit exists in a cooperative transmission cell such as to be different from the reference signal for main transmission that is used by the base station apparatus for performing main transmission, and a transmitting means is caused to transmit the reference signal to the terminal unit.
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Specification