Method and apparatus for controlling uplink transmission power

A terminal for controlling uplink power in a distributed multi-node system (DMNS), the terminal comprising:

• a radio frequency (RF) unit configured to transmit and receive a radio signal;
• and
• a controller operatively connected to the RF unit and configured to:
• receive equivalent isotropically radiated power (EIRP) information from a base station (BS) including a plurality of antenna nodes, each of the plurality of antenna nodes including at least one antenna;
• receive reference signals from the plurality of antenna nodes;
• measure received signal strength (RSS) of the reference signals;
• estimate an average propagation loss based on reception power of the reference signals;
• receive noise and interference (NI) information from the BS via a downlink control channel;
• determine transmission power with respect to an initial ranging channel by using the received EIRP information and the measured RSS of the reference signals;
• and
• determine uplink transmission power with respect to an uplink data channel based on the estimated average propagation loss and the received NI information,
• wherein the EIRP information is broadcasted through a superframe header (SFH) and comprises power values for each of the plurality of antenna nodes and the EIRP information, the SFH including an extended indicator,
• wherein, when the SFH is insufficient for broadcasting the EIRP information, the extended indicator is activated and the EIRP information is broadcasted through an extended SFH,
• wherein, in the estimating of the average propagation loss, the average propagation loss is estimated by using an arithmetic mean with respect to reception power of the reference signals corresponding to the plurality of respective antenna nodes, an arithmetic mean with respect to reception power greater than the effective reception power threshold value among reception power of the reference signals corresponding to the plurality of respective antenna nodes, or weighted average power with respect to the certain antenna nodes,
• wherein the weighted power average is calculated after a differential weight is applied to each of the plurality of antenna nodes with reference to reception power of corresponding reference signals, and
• wherein, after a reference antenna node among the plurality of antenna nodes is determined, the weight is determined by a ratio of uplink reception power of the respective antenna nodes to the reference antenna node.