Antenna combining for massive MIMO scheme
First Claim
1. A method for a base station to operate in a wireless communication system employing a massive MIMO (Multiple Input Multiple Output) scheme, the method comprising:
- receiving first pilot signals transmitted via each of multiple antennas of a user equipment (UE);
determining one or more virtual channels, wherein each of the one or more virtual channels comprises a corresponding reference codebook and one or more sub channels selected for the corresponding reference codebook, wherein the sub-channels are selected to minimize distance between a corresponding virtual channel and the corresponding reference codebook;
transmitting antenna combining information to the UE, wherein the antenna combining information combines the multiple antennas of the UE into one or more antenna groups corresponding to the one or more virtual channels;
receiving second pilot signals transmitted by the UE based on the antenna combining information;
estimating distance between the one or more virtual channels based on the received second pilot signals; and
transmitting a request message to the UE requesting to retransmit the first pilot signals when a correlation value becomes larger than a threshold value.
1 Assignment
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Accused Products
Abstract
The base station, receiving first pilot signals transmitted via each of multiple antennas of a user equipment (UE), selects one or more reference codebooks based on channel qualities of the received first pilot signals, and selects one or more sub-channels for each of the reference codebooks. Based on this, the base station determines one or more virtual channels, wherein each of the virtual channels comprises one reference codebook and the one or more sub channels selected for the one reference codebook, wherein the sub-channels are selected to minimum distance between corresponding virtual channel and corresponding reference codebook. And, the base station transmits antenna combining information to the UE, wherein the antenna combining information combines the multiple antennas of the UE into one or more antenna groups corresponding to the one or more virtual channels; and receive second pilot signals transmitted by the UE based on the antenna combining information.
8 Citations
7 Claims
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1. A method for a base station to operate in a wireless communication system employing a massive MIMO (Multiple Input Multiple Output) scheme, the method comprising:
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receiving first pilot signals transmitted via each of multiple antennas of a user equipment (UE); determining one or more virtual channels, wherein each of the one or more virtual channels comprises a corresponding reference codebook and one or more sub channels selected for the corresponding reference codebook, wherein the sub-channels are selected to minimize distance between a corresponding virtual channel and the corresponding reference codebook; transmitting antenna combining information to the UE, wherein the antenna combining information combines the multiple antennas of the UE into one or more antenna groups corresponding to the one or more virtual channels; receiving second pilot signals transmitted by the UE based on the antenna combining information; estimating distance between the one or more virtual channels based on the received second pilot signals; and transmitting a request message to the UE requesting to retransmit the first pilot signals when a correlation value becomes larger than a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification