Patent ID: 8989288
Filing Date: 2015-03-24
Classification: H04B,H04L,H04W

Abstract:
1. A Base Station BS comprising: a transmitter configured to transmit at least one common pilot to User Equipments UEs served by the BS; a determination unit configured to determine information related to the served UEs; and a configuration unit configured to configure transmission of the at least one common pilot by the transmitter based on the determined UE related information, wherein: the determination unit comprises a number ratio determination subunit configured to determine a number ratio of the number of 4-branch Multiple Input Multiple Output MIMO capable UEs to the summed number of both 4-branch MIMO capable UEs and 4-branch MIMO incapable UEs as the information related to UEs; and in response to the number ratio being higher than a first number ratio threshold, the configuration unit is configured to trigger the transmitter to transmit the at least one common pilot to support 4-branch MIMO transmission, and otherwise, the configuration unit is configured to trigger the transmitter not to transmit the at least one common pilot; and/or in response to the number ratio being higher than a second number ratio threshold, the configuration unit is configured to trigger the transmitter to transmit the at least one common pilot with a higher power, and otherwise, the configuration unit is configured to trigger the transmitter to transmit the at least one common pilot with a lower power; and/or the configuration unit is configured to trigger the transmitter to transmit the at least one common pilot with a power proportional to the determined number ratio.