Patent ID: 9686655
Date: 2017-06-20
CPC Classifications: H04B,H04W

Claim:
1. A communication method of simultaneously transmitting a plurality of signals to a plurality of user groups using at least one antenna group in a communication system, comprising: assigning the at least one antenna group to the plurality of user groups; generating a user group signal by combining user signals for each user group using a user multiplexing method; combining a plurality of user group signals using a group multiplexing method; and transmitting the combined plurality of user group signals to a plurality of users belonging to the plurality of user groups using the at least one antenna group, wherein the plurality of user group signals are different from each other in terms of at least one of channel condition factors, service condition factors, user condition factors, and transmission condition factors, wherein the channel condition factors include at least one of quality factors related to channel characteristics, and quality factors related to spatial characteristics; wherein the service condition factors include at least one of Quality-of-Service (QoS), a traffic class, and a location; wherein the user condition factors include at least one of the cost, the terminal capability, and a security level; and wherein the transmission condition factors include at least one of the user multiplexing method, a group combining weight vector, an antenna group, a duplexing method, a multiple access method, a modulation method, a channel coding method, and a Multiple-Input Multiple-Output (MIMO) transmission method, wherein the quality factors related to channel characteristics include at least one of a Received Signal Strength Indicator (RSSI), a Signal-to-Noise Ratio (SNR), a Received Signal Strength Indicator (SINR), an error rate, a channel capacity, a providable data rate, the variance of a providable data rate, and an outage rate; and the quality factors related to spatial characteristics include at least one of the correlation among user channels, the correlation among antennas, a rank of a channel matrix, and channel quality factors for each stream.