Method to beamform multicast transmission
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsRatheesh Kumar Mungara, Sairamesh Nammi, Jörg Huschke
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Abstract
A method, system and apparatus are disclosed. According to one or more embodiments, a network node is provided. The network node includes processing circuitry configured to receive channel state information, CSI, from each of a plurality of wireless devices and determine at least one null space based on the received CSI from each of the plurality of wireless devices. The processing circuitry is further configured to determine a common precoding matrix index, PMI, where a common beamforming vector is not in the at least one null space and cause a multicast broadcast transmission to the plurality of wireless devices using at least the common PMI.
Claims25
A method performed by a network node, the method comprising:
- receiving channel state information, CSI, from each of a plurality of wireless devices;
- determining at least one null space based on the received CSI from each of the plurality of wireless devices;
- determining a common precoding matrix index, PMI, the common PMI comprising a common beamforming vector which is not in the at least one null space of any one of individual beamforming vectors of the plurality of wireless devices;
- and
- causing a multicast broadcast transmission to the plurality of wireless devices using at least the common PMI.
A method performed by a first wireless device, the method comprising:
- receiving beamformed channel state information-reference signal, CSI-RS, signaling, the beamformed CSI-RS signaling being communicated based on a common precoding matrix index, PMI, the common PMI comprising a common beamforming vector which is not in any of at least one null space associated with a plurality of wireless devices including the first wireless device;
- computing a channel quality indicator, CQI, based on the beamformed CSI-RS signaling;
- and
- indicating the CQI that is based on the beamformed CSI-RS signaling to a network node.
A network node, comprising:
- processing circuitry configured to:
- receive channel state information, CSI, from each of a plurality of wireless devices;
- determine at least one null space based on the received CSI from each of the plurality of wireless devices;
- determine a common precoding matrix index, PMI, the common PMI comprising a common beamforming vector which is not in the at least one null space of any one of individual beamforming vectors of the plurality of wireless devices;
- and
- cause a multicast broadcast transmission to the plurality of wireless devices using at least the common PMI.
A first wireless device, comprising:
- processing circuitry configured to:
- receive beamformed channel state information-reference signal, CSI-RS, signaling, the beamformed CSI-RS signaling being communicated based on a common precoding matrix index, PMI, that the common PMI comprising a common beamforming vector which is not in any of at least one null space associated with a plurality of wireless devices including the first wireless device;
- compute a channel quality indicator, CQI, based on the beamformed CSI-RS signaling;
- and
- indicate the CQI that is based on the beamformed CSI-RS signaling to a network node.
Dependencies are inferred from the claim text.