Method and device for controlling hand-over message transmission power in a mobile communications system

A method of a serving base station for controlling handover message transmission power of a mobile station in a mobile communication system, the method comprising the steps of:

• if a scanning interval allocation request (MOB_SCN_REQ) message is received from a mobile station, providing information on an uplink and downlink measurement interval to the mobile station and neighbor base stations;
• receiving uplink information from the neighbor base stations;
• when handover initiation is requested from the mobile station, determining a handover target base station among the neighbor base stations;
• and
• transmitting uplink information received from the handover target base station to the mobile station,
• wherein the uplink information received from the handover target base station is generated based on information on a power for handover ranging message that the handover target base station receives from at least one of mobile stations,
• wherein a maximum transmission power of the handover ranging message is determined based on any one of Equation 4 and Equation 5 below:
• PTX_HR_MAX=EIRxPHR,max,min,average−MS_EIRP−RSSBS (4)
• wherein the ‘PTX_HR_MAX’ represents the maximum transmission power of the handover ranging message, the ‘EIRxPHR,max,min,average’ represents an average value, maximum value, or minimum value of equivalent isotropic received power for the handover ranging message, the ‘MS_EIRP’ represents equivalent isotropic radiated power of mobile station, and the ‘RSSBS’ represents a Received Signal Strength Indicator (RSSI) measured in the target base station, and
• PTX_HR_MAX=EIRxPHR,max,min,average−MS_EIRP−10 log(RSSBS/10−Pinterference−Pnoise) (5)
• wherein the ‘PTX_HR_MAX’ represents the maximum transmission power of the handover ranging message, the ‘EIRxPHR,max,min,average’ represents an average value, maximum value, or minimum value of equivalent isotropic received power for the handover ranging message, the ‘MS_EIRP’ represents equivalent isotropic radiated power of a mobile station, the ‘RSSBS’ represents a Received Signal Strength Indicator (RSSI) measured in the target base station, and the ‘Pinterference’ and the ‘Pnoise’ represent interference power of a linear unit for uplink measured in the target base station and noise power.

A method of a neighbor base station for controlling handover message transmission power of a mobile station in a mobile communication system, the method comprising the steps of:

• measuring an uplink signal of a specific mobile station using information on an uplink measurement interval provided from a serving base station of the specific mobile station;
• providing the uplink signal measurement result to a mobile station;
• and
• providing received power information on a handover ranging message to the mobile station,
• wherein the received power information is generated based on information on a power for handover ranging message that the neighbor base station receives from at least one of mobile base stations, and
• wherein a maximum transmission power of the handover ranging message is determined based on any one of Equation 4 and Equation 5 below:
• PTX_HR_MAX=EIRxPHR,max,min,average−MS_EIRP−RSSBS (4)
• wherein the ‘PTX_HR_MAX’ represents the maximum transmission power of the handover ranging message, the ‘EIRxPHR,max,min,average’ represents an average value, maximum value, or minimum value of equivalent isotropic received power for the handover ranging message, the ‘MS_EIRP’ represents equivalent isotropic radiated power of mobile station, and the ‘RSSBS’ represents a Received Signal Strength Indicator (RSSI) measured in the target base station, and
• PTX_HR_MAX=EIRxPHR,max,min,average−MS_EIRP−10 log(RSSBS/10−Pinterference−Pnoise) (5)
• wherein the ‘PTX_HR_MAX’ represents the maximum transmission power of the handover ranging message, the ‘EIRxPHR,max,min,average’ represents an average value, maximum value, or minimum value of equivalent isotropic received power for the handover ranging message, the ‘MS_EIRP’ represents equivalent isotropic radiated power of a mobile station, the ‘RSSBS’ represents a Received Signal Strength Indicator (RSSI) measured in the target base station, and the ‘Pinterference’ and the ‘Pnoise’ represent interference power of a linear unit for uplink measured in the target base station and noise power.

A device for controlling handover message transmission power of a mobile station in a mobile communication system, the device comprising:

• a transceiver for receiving uplink information on a handover target base station, and transmitting the handover target base station a handover ranging message;
• a transmission power determiner for determining a maximum transmission power of a handover ranging message using the uplink information;
• and
• a transmission power controller for controlling the handover ranging message to be transmitted at a power level below the determined maximum transmission power,
• wherein the uplink information on the handover target base station is generated based on information on a power for handover ranging message that the handover target base station receives from at least one of mobile stations, and
• wherein the maximum transmission power of the handover ranging message is determined based on any one of Equation 4 and Equations 5 below:
• PTX_HR_MAX=EIRxPHR,max,min,average−MS_EIRP−RSSBS (4)
• wherein the ‘PTX_HR_MAX’ represents the maximum transmission power of the handover ranging message, the ‘EIRxPHR,max,min,average’ represents an average value, maximum value, or minimum value of equivalent isotropic received power for the handover ranging message, the ‘MS_EIRP’ represents equivalent isotropic radiated power of mobile station, and the ‘RSSBS’ represents a Received Signal Strength Indicator (RSSI) measured in the target base station, and
• PTX_HR_MAX=EIRxPHR,max,min,average−MS_EIRP−10 log(RSSBS/10−Pinterference−Pnoise) (5)
• wherein the ‘PTX_HR_MAX’ represents the maximum transmission power of the handover ranging message, the ‘EIRxPHR,max,min,average’ represents an average value, maximum value, or minimum value of equivalent isotropic received power for the handover ranging message, the ‘MS_EIRP’ represents equivalent isotropic radiated power of a mobile station, the ‘RSSBS’ represents a Received Signal Strength Indicator (RSSI) measured in the target base station, and the ‘Pinterference’ and the ‘Pnoise’ represent interference power of a linear unit for uplink measured in the target base station and noise power.

A device of a serving base station for controlling handover message transmission power of a mobile station in a mobile communication system, the device comprising:

• a controller for, if a scanning interval allocation request (MOB_SCN_REQ) message is received from a mobile station, providing information on an uplink and downlink measurement interval to the mobile station and neighbor base stations, and transmitting uplink information received from the neighbor base stations to the mobile station,
• wherein the uplink information received from the neighbor base station is generated based on information on a power for handover ranging message that the handover target base station receives from at least one of mobile stations, and
• wherein a maximum transmission power of the handover ranging message is determined based on any one of Equation 4 and Equation 5 below:
• PTX_HR_MAX=EIRxPHR,max,min,average−MS_EIRP−RSSBS (4)
• wherein the ‘PTX_HR_MAX’ represents the maximum transmission power of the handover ranging message, the ‘EIRxPHR,max,min,average’ represents an average value, maximum value, or minimum value of equivalent isotropic received power for the handover ranging message, the ‘MS_EIRP’ represents equivalent isotropic radiated power of mobile station, and the ‘RSSBS’ represents a Received Signal Strength Indicator (RSSI) measured in the target base station, and
• PTX_HR_MAX=EIRxPHR,max,min,average−MS_EIRP−10 log(RSSBS/10−Pinterference−Pnoise) (5)
• wherein the ‘PTX_HR_MAX’ represents the maximum transmission power of the handover ranging message, the ‘EIRxPHR,max,min,average’ represents an average value, maximum value, or minimum value of equivalent isotropic received power for the handover ranging message, the ‘MS_EIRP’ represents equivalent isotropic radiated power of a mobile station, the ‘RSSBS’ represents a Received Signal Strength Indicator (RSSI) measured in the target base station, and the ‘Pinterference’ and the ‘Pnoise’ represent interference power of a linear unit for uplink measured in the target base station and noise power.

A device of a neighbor base station for controlling handover message transmission power of a mobile station in a mobile communication system, the device comprising:

• an uplink measurement unit for measuring an uplink signal of a specific mobile station using information on an uplink measurement interval provided from a serving base station of the specific mobile station, and measuring received power for handover ranging message;
• and
• a controller for controlling to provide the uplink signal measurement result and information on the measured received power for the handover ranging message to a mobile station,
• wherein the received power information for the handover ranging message is at least one of average equivalent isotropic received power, maximum equivalent isotropic received power, or minimum equivalent isotropic received power for handover ranging message that the neighbor base station receives from at least one of mobile stations, and
• wherein a maximum transmission power of the handover ranging message is determined based on any one of Equation 4 and Equation 5 below:
• PTX_HR_MAX=EIRxPHR,max,min,average−MS_EIRP−RSSBS (4)
• wherein the ‘PTX_HR_MAX’ represents the maximum transmission power of the handover ranging message, the ‘EIRxPHR,max,min,average’ represents an average value, maximum value, or minimum value of equivalent isotropic received power for the handover ranging message, the ‘MS_EIRP’ represents equivalent isotropic radiated power of mobile station, and the ‘RSSBS’ represents a Received Signal Strength Indicator (RSSI) measured in the target base station, and
• PTX_HR_MAX=EIRxPHR,max,min,average−MS_EIRP−10 log(RSSBS/10−Pinterference−Pnoise) (5)
• wherein the ‘PTX_HR_MAX’ represents the maximum transmission power of the handover ranging message, the ‘EIRxPHR,max,min,average’ represents an average value, maximum value, or minimum value of equivalent isotropic received power for the handover ranging message, the ‘MS_EIRP’ represents equivalent isotropic radiated power of a mobile station, the ‘RSSBS’ represents a Received Signal Strength Indicator (RSSI) measured in the target base station, and the ‘Pinterference’ and the ‘Pnoise’ represent interference power of a linear unit for uplink measured in the target base station and noise power.