MDT information-reporting format in a wireless communication system, and time-stamp configuring method and apparatus
A method for configuring a Minimization of Drive Test (MDT) information reporting format and a time-stamp is provided that supports MDT in a 3 rd Generation Partnership Project (3GPP) system. The method defines a reporting format needed in a process where UE transmits MDT measurements to a serving base station, and sets the number of bits required to log time stamp and the unit of logging time.
1. A method for transmitting channel measurements to a base station by a terminal in a wireless communication system, comprising:
receiving channel measurement configuration information including absolute time information and sampling cycle information from the base station;
measuring channel information with relative time information of the absolute time information at cycles based on the sampling cycle information;
logging the measured channel information including the relative time information; and
transmitting the logged channel information including the relative time information and the absolute time information to the base station,
wherein the relative time information is stored in a hit field, and a size of the bit field is fixed, and
wherein the logging of the measured channel information comprises:
determining whether the relative time information can be expressed with the size of the bit field;
logging, if the relative time information is capable of being expressed with the size of the bit field, the relative time information in the bit field; and
resetting the relative time information if the relative time information isn't capable of being expressed with the size of the bit field.
2. The method of claim 1 , wherein the relative time information is a value in seconds.
3. The method of claim 1 , wherein the logging of the measured channel information comprises:
logging the measured channel information in: a header, including at least one of the absolute time information, the sampling cycle information, a measurement type; and measurement information including samples each of which includes at least one of IE indicators, global cell ID of a serving cell, the channel measurements, location information, and the relative time information.
4. A terminal that measures channel information and transmits the channel information to a base station in a wireless communication system, comprising:
a transceiver configured to:
receive channel measurement configuration information including absolute time information and sampling cycle information from the base station, and
transmit created channel measurements to the base station; and
a controller configured to:
measure channel information with relative time information of the absolute time information at cycles based on the sampling cycle information,
log the measured channel information including the relative time information, and
transmit the logged channel information to the base station,
wherein the relative time information is stored in a bit field, and a size of the bit field is fixed, and
wherein the controller is further configured to:
determine whether the relative time information can be expressed with the size of the bit field,
log, if the relative time information is capable of being expressed with the size of the bit field, the relative time information in the bit field, and
reset the relative time information if the relative time information isn't capable of being expressed with the size of the bit field.
5. The terminal of claim 4 , wherein the relative time information is a value in seconds.
6. The terminal of claim 4 , wherein the controller is further configured to log the measured channel information in: a header, including at least one of the absolute time information, the sampling cycle information, a measurement type; and measurement information including samples each of which includes at least one of IE indicators, global cell ID of a serving cell, the channel measurements, location information, and the relative time information.