EARLY HANDOVER PREPARATION AND EARLY HANDOVER COMMAND

摘要

A handover procedure for a terminal device in a wireless telecommunications system comprising the terminal device, a source network access node to which the terminal device is initially connected, and one or more candidate target network access nodes, wherein the method comprises: establishing a first measurement for radio channel conditions between the terminal device and respective one of the one or more candidate target network access nodes; determining that the first measurement for radio channel conditions for a first candidate target access node satisfies a first predefined criterion; transmitting from the terminal device to the source network access node an indication that the first measurement of radio channel conditions for the first candidate target network access node satisfies the first predefined criterion; receiving at the terminal device connection information for use by the terminal device for connecting to the first candidate target network access node; establishing a second measurement for radio channel conditions between the terminal device and respective one of the one or more candidate target network access nodes; determining that the second measurement of radio channel conditions satisfies a second predefined criterion; transmitting from the terminal device to the source network access node an indication that the second measurement of radio channel conditions for the first candidate target network access node satisfies the second predefined criterion; receiving at the terminal device an indication the terminal device should connect to the first candidate target network access node, and in response thereto, transmitting signalling from the terminal device to the first candidate target network access node to initiate a connection to the first candidate target network access node using the connection information.