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What is MUMIMO ?
MUMIMO stands for Multi User MIMO. It means Performing MIMO for more than 2 UEs simultaneously as illustrated below. This is not a new concept. We have MUMIMO in current LTE (TM5) and WLAN (802.11ad). However, the scale of MUMIMO will be much larger and deployment will also be more common. As far as I experienced, I haven't seen any case where TM5 is really used in current LTE live network. In case of 802.11ad, the distance between UE and transmitter antenna is designed to be very short comparing to 5G network. So real implementation of MUMIMO for 5G will be much more challenging.
How challenging it would be to implement MUMIMO ? The answer would be different depending on many factors. Even with the same number of users and same number of Tx/Rx antenna, there can be different mode of antenna allocation as illustrated below. There can be several factors to be considered in MUMIMO implementation as follows.
