Patent ID: 9668154
Date: 2017-05-30
CPC Classifications: H04B,H04W

Claim:
1. A radio measurement collection method used in a radio terminal, comprising: receiving a measurement configuration from a network; initiating an immediate type-MDT (Minimization of Drive Test) measurement processing based on the measurement configuration, in a radio resource control (RRC) connected state; performing a handover after initiating the immediate type-MDT measurement processing from a radio base station that supports MDT to a radio base station that does not support MDT; in response to the handover to the radio base station that does not support the MDT, switching from the immediate type-MDT measurement processing to a logged type-MDT measurement processing in the RRC connected state; performing the logged type-MDT measurement processing in the RRC connected state following the handover; and reporting logged data to the network, wherein in the logged type-MDT measurement processing in the RRC connected state, the radio terminal performs measurement of a radio environment in accordance with the measurement configuration in the RRC connected state and logs the measurement in the RRC connected state.