Apparatus and method for controlling transmission power of downlink data channel in a mobile communication system supporting MBMS

2 The method of claim 1, wherein the channel quality information is a power contol bit.

A method for controlling transmission power of a Node B by a UE (User Equipment) in a mobile communication system including the Node B and a plurality of UEs capable of communicating with the Node B in a cell occupied by the Node B, the Node B being capable of broadcasting common information to specific UEs among the plurality of UEs, comprising the steps of:

• measuring a channel quality by receiving the common data stream for a first predetermined period;
• and
• transmitting an up-TPC command for a second predetermined period if the measured channel quality is less than a predetermined target channel quality.

An apparatus for controlling transmission power to plurality of UEs (User Equipments) for multimedia multicast/broadcast service in a mobile communication system including a Node B and the plurality of UEs capable of communicating with the Node B in a cell occupied by the Node B, the Node B being capable of broadcasting multimedia multicast/broadcast data to specified UEs among the plurality of UEs, comprising:

• a receiver for receiving channel quality information for each UE from the plurality of UEs;
• and
• a transmitter for increasing or decreasing transmission power of the Node B based on the worst channel quality information among the channel quality information received from the plurality of UEs.

An apparatus for controlling transmission power of a Node B by a UE (User Equipment) in a mobile communication system including the Node B and a plurality of UEs capable of communicating with the Node B in a cell occupied by the Node B, the Node B being capable of broadcasting multimedia multicast/broadcast data to specific UEs among the plurality of UEs, comprising:

• a receiver for measuring a channel quality by receiving the data for a first predetermined period;
• and
• a transmitter for transmitting an up-TPC command for a second predetermined period if the measured channel quality is less than a predetermined target channel quality.

A method for controlling transmission power of a Node B by a UE (User Equipment) in a mobile communication system including the Node B and a plurality of UEs capable of communicating with the Node B in a cell occupied by the Node B, the Node B being capable of broadcasting multimedia multicast/broadcast data to specified UEs among the plurality of UEs, comprising the steps of:

• receiving a downlink shared channel signal with the multimedia multicast/broadcast data from the Node B, and measuring channel quality using the received downlink shared channel signal;
• and
• transmitting a TPC (Transmission Power Control) command for increasing or decreasing transmission power of the downlink shared channel over an uplink dedicated channel based on the measured channel quality.

An apparatus for controlling transmission power of a Node B by a UE (User Equipment) in a mobile communication system including the Node B and a plurality of UEs capable of communicating with the Node B in a cell occupied by the Node B, the Node B being capable of broadcasting common information to specified UEs among the plurality of UEs, comprising:

• a downlink shared channel receiver for receiving a downlink shared channel signal with the common information from the Node B, and measuring channel quality using the received downlink shared channel signal;
• and
• an uplink dedicated channel transmitter for transmitting a TPC (Transmission Power Control) command for increasing or decreasing transmission power of the downlink shared channel based on the measured channel quality.

A method for controlling transmission power to a plurality of UEs (User Equipments) for multimedia broadcast/multicast service in a mobile communication system including the Node B and the plurality of UEs capable of communicating with a Node B in a cell occupied by the Node B, the Node B being capable of broadcasting multimedia multicast/broadcast data to specified UEs among the plurality of UEs, comprising the steps of:

• determining to interrupt transmission power control on the Node B while increasing or decreasing transmission power of the Node B, based on power control information received over dedicated channels from the plurality of UEs;
• and
• interrupting transmission power control on the Node B by releasing dedicated channels assigned to the plurality of UEs according to the determination to interrupt the transmission power control on the Node B.

A method for controlling transmission power of downlink common channel signal in a mobile communication system, comprising the steps of:

• receiving a information of the downlink common channel signal strength from at least one UE;
• and
• determining the transmission power of downlink common channel signal by the information.