Patent ID: 8830926
Filing Date: 2014-09-09
Classification: H04B

Abstract:
1. A method for coordinating a joint transmission between a plurality of cooperative access nodes serving a plurality of user terminals in a mobile communications system, the method comprising: regularly transmitting virtual pilot signals by said access nodes to the plurality of user terminals; receiving channel information by said access nodes from user terminals that are being served by said access nodes, the received channel information comprising the virtual pilot signals received by said user terminals; exchanging between said access nodes over an X2 interface said received channel information only for resource blocks that are actually assigned to at least one user terminal of the plurality of user terminals for a cooperative transmission, thus ensuring that all channel information is distributed to all cooperative access nodes; processing all received channel information by each one of said access nodes, and determining by said access nodes using said processed channel information, a channel estimation for said joint transmission.