Method and device for preserving mobility information in terminal state transition and effectively re-accessing in heterogeneous cell network in mobile communication system

A method performed by a base station in a wireless communication system, the method comprising:

• receiving, from a user equipment (UE), a setup complete message to confirm a completion of a radio resource control (RRC) connection establishment, wherein the setup complete message includes information for mobility history availability indicating that the UE has mobility history information available and mobility state information indicating a mobility state which is determined based on parameters for determining a UE mobility state, and wherein the mobility state includes a mobility state of the UE just prior to entering an RRC connected state;
• transmitting, to the UE, a UE information request message generated based on the setup complete message, the UE information request message including information for requesting a report of the mobility history information;
• and
• receiving, from the UE, a UE information response message including the mobility history information, as a response to the UE information request message,
• wherein the mobility history information includes a list of at least one visited cell information.

A user equipment (UE) in a wireless communication system, the UE comprising:

• a transceiver configured to transmit and receive a signal;
• and
• a controller configured to:
• receive a system information block(SIB) including information on parameters for determining a UE mobility state,
• transmit, to a base station, a setup complete message to confirm a completion of a radio resource control (RRC) connection establishment, wherein the setup complete message includes mobility state information indicating a mobility state of the UE just prior to entering an RRC connected state, the mobility state of the UE being determined based on the parameters, and wherein the setup complete message further includes information for mobility history availability in case that the UE has mobility history information available,
• receive, from the base station, a UE information request message generated based on the setup complete message, the UE information request message including information for requesting a report of the mobility history information, and
• transmit, to the base station, a UE information response message including the mobility history information, as a response to the UE information request message,
• wherein the mobility history information includes a list of at least one visited cell information.

A base station in a wireless communication system, the base station comprising:

• a transceiver configured to transmit and receive a signal;
• and
• a controller configured to:
• receive, from a user equipment (UE), a setup complete message to confirm a completion of a radio resource control (RRC) connection establishment, wherein the setup complete message includes information for mobility history availability information indicating that the UE has mobility history information available and mobility state information indicating a mobility state which is determined based on parameters for determining a UE mobility state, and wherein the mobility state includes a mobility state of the UE just prior to entering an RRC connected state,
• transmit, to the UE, a UE information request message generated based on the setup complete message, the UE information request message including information for requesting a report of the mobility history information, and
• receive, from the UE, a UE information response message including the mobility history information, as a response to the UE information request message,
• wherein the mobility history information includes a list of at least one visited cell information.