A method for operating a mobile station, MS, in a wireless communication system, the method comprising: transmitting, to a first base station, BS, a connection request message to generate a service flow, the connection request message including information for indicating a type of the service flow; receiving from the first base station a handover command instructing the MS to handover and informing that a target base station BS is a second BS; transmitting, to the second base station, BS, a reconnection request message according to the handover command; receiving, from the second base station, a reconnection response, including a network address identifier if the type of the service flow is a second type; performing a handover from the first BS to the second BS; communicating, if the type of the service flow is a first type, traffic of the service flow through a first path; and communicating, if the type of the service flow is the second type, the traffic of the service flow through a second path, using the network address identifier; wherein the first type indicates that the service flow requires the first BS to operate as the anchor, wherein the second type indicates that the service flow does not require the first BS to operate as the anchor; wherein the first path comprises: a path between the MS and the second BS; a path between the second BS and the first BS; a path between the first BS and a core network, wherein the second path comprises: the path between the MS and the second BS; and a path between the second BS and the core network. transmitting, to a first base station, BS, a connection request message to generate a service flow, the connection request message including information for indicating a type of the service flow; receiving from the first base station a handover command instructing the MS to handover and informing that a target base station BS is a second BS; transmitting, to the second base station, BS, a reconnection request message according to the handover command; receiving, from the second base station, a reconnection response, including a network address identifier if the type of the service flow is a second type; performing a handover from the first BS to the second BS; communicating, if the type of the service flow is a first type, traffic of the service flow through a first path; and communicating, if the type of the service flow is the second type, the traffic of the service flow through a second path, using the network address identifier; wherein the first type indicates that the service flow requires the first BS to operate as the anchor, wherein the second type indicates that the service flow does not require the first BS to operate as the anchor; wherein the first path comprises: a path between the MS and the second BS; a path between the second BS and the first BS; a path between the first BS and a core network, a path between the MS and the second BS; a path between the second BS and the first BS; a path between the first BS and a core network, wherein the second path comprises: the path between the MS and the second BS; and a path between the second BS and the core network. the path between the MS and the second BS; and a path between the second BS and the core network.