Preparation phase for switching between SU-MIMO and MU-MIMO
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsMuhammad Kazmi, Jingyi Liao
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Abstract
The present invention relates to a method and arrangement for switching between different modes in a communications network. The network comprises a number of transmit and a number of receive antennas, said modes comprising a single user mode and a multiple user mode. The method including the steps of: transmitting reference signals or predetermined sequences corresponding to both said modes comprising respective weighting matrices for said modes during a preparation phase, which comprises of one or more transmission time intervals (TTI), transmitting on a common channel, signalling information indicating start and duration of said preparation phase to all receiving equipments in a reception area.
Claims21
A method in a base station for switching between different MIMO-transmission modes in a communications network, said network comprising a number of transmit antennas and a number of receive antennas, said modes comprising a single-user mode and a multi-user mode, comprising the steps of:
- transmitting on a common or shared channel signalling information including at least an indication of the start of a preparation phase, wherein said preparation phase is related to switching between the single user-mode and the multi user-mode, wherein said signalling information is transmitted to all receiving user equipments in a reception area;
- and
- transmitting reference signals corresponding to both said MIMO-transmission modes with respective weighting matrices for the modes during said preparation phase for switching between the single user-mode and the multi user-mode comprising of one or more transmission time intervals (TTI).
A method in a user equipment comprising a number of antennas for receiving signals in different MIMO-transmission modes in a communications network, said modes comprising a single-user mode and a multi-user mode, comprising the steps of:
- receiving and interpreting signalling information transmitted on a common or shared channel including at least an indication of the start of a preparation phase, wherein said preparation phase is related to switching between the single user-mode and the multi user-mode;
- receiving reference signals corresponding to both said modes with respective weighting matrices for the modes during the preparation phase for switching between the single user-mode and the multi user-mode comprising of one or more transmission time intervals (TTI);
- and
- providing MIMO-feedback information on data streams used for downlink transmission during the preparation phase for switching between the single user-mode and the multi user-mode with respect to a new MIMO-transmission mode while maintaining communication according to the previously applied MIMO-transmission mode.
An arrangement for use in a base station in a communications network, said base station communicating with a number of antennas, said arrangement being provided for switching between different modes in said communications network, said modes comprising a single-user mode and a multi-user mode, further comprising:
- means for preparing transmission reference signals corresponding to both said modes comprising respective weighting matrices for said modes during a preparation phase, wherein said preparation phase is related to switching between the single user-mode and the multi user-mode, said preparation phase comprising of one or more transmission time intervals (TTI);
- and
- means for preparing for transmitting on a common or shared channel signalling information including at least an indication of the start of said preparation phase for switching between the single user-mode and the multi user-mode to receiving user equipments in a reception area.
An arrangement for use in a user equipment comprising a number of antennas, said arrangement being provided for receiving signals in different modes in a communications network, said modes comprising a single-user mode and a multi-user mode, further comprising:
- means for receiving reference signals corresponding to both said modes with respective weighting matrices for said modes during a preparation phase, wherein said preparation phase is related to switching between the single user-mode and the multi user-mode, said preparation phase comprising one or more transmission time intervals (TTI),
- means for receiving and correctly interpreting signalling information transmitted on a common or shared channel including at least an indication of the start of the preparation phase for switching between the single user-mode and the multi user-mode;
- and
- means for providing feedback with respect to the new mode while maintaining communication according to the previous mode.
Dependencies are inferred from the claim text.