Method for Channel Estimation, Base Station and Mobile Node
The present invention refers to channel estimation in a communications network. According to the present invention, first two reference signals are transmitted by a base station to a set of mobile nodes in said communications network, wherein said base station includes first two antenna ports and wherein each of said first two reference signals refers to one antenna port of said first two antenna ports. Further, at least one second reference signal is transmitted by said base station to a cooperating mobile node, wherein said cooperating mobile node is included in said set of mobile nodes; said cooperating mobile node is assigned to a cooperation area in said communications network, said cooperation area being defined by said base station; and said at least one second reference signal refers to a corresponding further antenna port of further antenna ports included in said base station.
1 . Method for channel estimation in a communications network, wherein said method comprises:
transmitting first two reference signals by a base station to a set of mobile nodes in said communications network, wherein said base station comprises first two antenna ports and wherein each of said first two reference signals refers to one antenna port of said first two antenna ports; and
transmitting at least one second reference signal by said base station to a cooperating mobile node, wherein:
said cooperating mobile node is comprised in said set of mobile nodes;
said cooperating mobile node is assigned to a cooperation area in said communications network, said cooperation area being defined by said base station; and
said at least one second reference signal refers to a corresponding further antenna port of further antenna ports comprised in said base station.
2 . The method according to claim 1 , wherein said method comprises transmitting of a control message by said base station to said cooperating mobile node, said control message indicating that said cooperating mobile node is assigned to said cooperation area, and wherein said at least one second reference signal is transmitted after said transmitting of said control message.
3 . The method according to claim 1 , wherein said at least one second two reference signal is transmitted in a message indicating availability of said further antenna ports.
4 . The method according to claim 1 , wherein said method comprises dividing of a frequency band of said base station into:
a first sub band configured for said transmitting of said first two reference signals; and
a second sub band configured for said transmitting of said at least one second reference signal.
5 . The method according to claim 4 , wherein said second sub band is configured for said transmitting of said first two reference signals.
6 . The method according to claim 1 , wherein said transmitting of said at least one second reference signal is performed by use of a whole frequency band.
7 . The method according claim 1 , wherein said method comprises transmitting of at least one dedicated reference signal by said base station to said cooperating mobile node after assigning of said cooperating mobile node said to cooperation area.
8 . The method according to claim 7 , wherein said at least one second reference signal is precoded before said transmitting of said at least one second reference signal.
9 . The method according to claim 1 , wherein said at least one second reference signal represents a resource block.
10 . A computer program product comprising a code, the code being configured to implement a method according to claim 1 .
11 . A data carrier comprising a computer program product according to claim 10 .
12 . A base station, wherein said base station comprises a transmitting module, said transmitting module being configured for:
transmitting first two reference signals to a set of mobile nodes in said communications network, wherein said base station comprises first two antenna ports and wherein each of said first two reference signals refers to one antenna port of said first two antenna ports; and
transmitting at least one second reference signal to a cooperating mobile node, wherein:
said cooperating mobile node is comprised in said set of mobile nodes;
said cooperating mobile node is assigned to a cooperation area in said communications network, said cooperation area being defined by said base station; and
said at least one second reference signal refers to a corresponding further antenna port of further antenna ports comprised in said base station.
13 . A mobile node, wherein said mobile node comprises a receiving module, said receiving module being configured for:
receiving of first two reference signals from a base station in a communications network, wherein said base station comprises first two antenna ports and wherein each of said first two reference signals refers to one antenna port of said first two antenna ports; and
receiving of at least one second reference signal from said base station, if said mobile node is assigned to a cooperation area in said communications network, said cooperation area being defined by said base station, wherein said at least one second reference signal refers to a corresponding further antenna port of further antenna ports comprised in said base station.