Base stations, mobile communication devices, and connection maintenance methods for connected mode extended discontinuous reception (edrx)

A connection maintenance method for a base station wirelessly communicating with a mobile communication device operating in a connected mode extended Discontinuous Reception (eDRX), the connection maintenance method comprising:

• determining whether a moving speed of the mobile communication device exceeds a threshold value;
• transmitting measurement information and radio resource configurations of one or more neighboring cells to the mobile communication device when the moving speed exceeds the threshold value;
• and
• activating radio resources of the neighboring cells for an upcoming eDRX-ON duration of the mobile communication device.

A connection maintenance method for a mobile communication device operating in a connected mode extended Discontinuous Reception (eDRX), the connection maintenance method comprising:

• receiving measurement information and radio resource configurations of one or more neighboring cells from a base station, when a moving speed of the mobile communication device exceeds a threshold value;
• performing measurements on a serving cell and the neighboring cells according to the measurement information of the neighboring cells;
• and
• switching from the serving cell to the one of the neighboring cells according to the radio resource configurations of the neighboring cells, when a result of the measurements indicates that the serving cell has poor signal quality and one of the neighboring cells has good signal quality.