Method of mapping CSI-RS ports to resource blocks, base station and user equipment
AssigneePanasonic Intellectual Property Corporation of America
InventorsMing Xu, Masayuki Hoshino, Kazuki Takeda, Lilei Wang
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Abstract
The present disclosure provides a communication method that a base station configures different CSI-RS ports with different periodicity based on UE requirement (e.g. mobility) to reduce CSI-RS overhead. And another method is to transmit partial CSI-RS ports in a cyclic shifted manner to further reduce the overhead. In addition, cyclic shifted transmission of split CSI-RS port groups are proposed to reduce the potential big difference of interference onto different CSI-RS port groups.
Claims9
A communication method of mapping channel state information-reference signal (CSI-RS) ports onto resource blocks, comprising:
- mapping a first group of CSI-RS ports used for user equipments with low mobility onto the resource blocks in a first transmission period, wherein the first transmission period is a regularly-repeated cycle in which the first group of CSI-RS ports is mapped onto the resource blocks;
- and
- mapping a second group of CSI-RS ports used for user equipments with high mobility onto the resource blocks in a second transmission period, wherein the second transmission period is a regularly-repeated cycle in which the second group of CSI-RS ports is mapped onto the resource blocks,
- wherein the number of the CSI-RS ports in the first group is more than that in the second group, and the first transmission period is longer than the second transmission period.
A base station for mapping channel state information-reference signal (CSI-RS) ports onto resource blocks, comprising:
- a processor, which, in operation, maps a first group of CSI-RS ports used for user equipments with low mobility onto the resource blocks in a first transmission period, and maps a second group of CSI-RS ports used for user equipments with high mobility onto the resource blocks in a second transmission period, wherein the first transmission period is a regularly-repeated cycle in which the first group of CSI-RS ports is mapped onto the resource blocks and the second transmission period is a regularly-repeated cycle in which the second group of CSI-RS ports is mapped onto the resource blocks,
- wherein the number of the CSI-RS ports in the first group is more than that in the second group, and the first transmission period is longer than the second transmission period, and
- a transmitter, which, in operation, transmits the CSI-RS ports mapped onto the resource blocks.
A user equipment comprising:
- a receiver, which, in operation, receives, from a base station, resource blocks, onto which a first group of channel state information-reference signal (CSI-RS) ports used for user equipments with low mobility is mapped in a first transmission period, and onto which a second group of CSI-RS ports used for user equipments with high mobility is mapped in a second transmission period, wherein the first transmission period is a regularly-repeated cycle in which the first group of CSI-RS ports is mapped onto the resource blocks and the second transmission period is a regularly-repeated cycle in which the second group of CSI-RS ports is mapped onto the resource blocks,
- wherein the number of the CSI-RS ports in the first group is more than that in the second group, and the first transmission period is longer than the second transmission period, and
- a processor, which, in operation, performs channel estimation using at least some of the CSI-RS ports mapped onto the resource blocks.
Dependencies are inferred from the claim text.