A method executed by a user equipment, UE, handling messages in a UMTS wireless communication system, comprising: partially receiving, by a receiver of the UE from or to a network entity via a signaling radio bearer, a first signaling-related message associated with a first UE configuration; triggering a state transition message that initiates a change at the UE to a second UE configuration different from the first UE configuration; determining, in association with the triggering of the state transition message, that the first signaling-related message has not been successfully received, wherein the first signaling-related message comprises a multi-segment message, and determining that the first signaling-related message has not been successfully received comprises determining that at least one segment of the multi-segment message has not been received; writing, by the UE, invalid data into the received segments of the first signaling-related message in response to determining that the at least one segment of the multi-segment message has not been successfully received and in response to determining a UE configurations conflict; sending, by the UE, after determining that the first signaling-related message has not been successfully received and after determining the UE configurations conflict, an indication message to coordinate discarding of the first signaling-related message with the network entity, wherein the method, before sending the indication message, comprises: performing, by the UE, an integrity check on the received segments of the first signaling-related message, and sending, by the UE, a reconfiguration failure message in response to an integrity check failure for the received segments of the first signaling-related message that include the invalid data; and discarding, by the UE, the received segments of the first signaling-related message; and receiving, by the UE, after sending the indication message, a second signaling-related message associated with the second UE configuration. partially receiving, by a receiver of the UE from or to a network entity via a signaling radio bearer, a first signaling-related message associated with a first UE configuration; triggering a state transition message that initiates a change at the UE to a second UE configuration different from the first UE configuration; determining, in association with the triggering of the state transition message, that the first signaling-related message has not been successfully received, wherein the first signaling-related message comprises a multi-segment message, and determining that the first signaling-related message has not been successfully received comprises determining that at least one segment of the multi-segment message has not been received; writing, by the UE, invalid data into the received segments of the first signaling-related message in response to determining that the at least one segment of the multi-segment message has not been successfully received and in response to determining a UE configurations conflict; sending, by the UE, after determining that the first signaling-related message has not been successfully received and after determining the UE configurations conflict, an indication message to coordinate discarding of the first signaling-related message with the network entity, wherein the method, before sending the indication message, comprises: performing, by the UE, an integrity check on the received segments of the first signaling-related message, and sending, by the UE, a reconfiguration failure message in response to an integrity check failure for the received segments of the first signaling-related message that include the invalid data; and performing, by the UE, an integrity check on the received segments of the first signaling-related message, and sending, by the UE, a reconfiguration failure message in response to an integrity check failure for the received segments of the first signaling-related message that include the invalid data; and discarding, by the UE, the received segments of the first signaling-related message; and receiving, by the UE, after sending the indication message, a second signaling-related message associated with the second UE configuration.