Abstract: A multimode-multiband terminal includes an RF antenna for transceiving a CDMA-2000 signal and/or a WCDMA signal; an RF transceiver for demodulating a WCDMA pilot signal received from the RF antenna and outputting the demodulated WCDMA pilot signal; a pilot signal measurement unit for measuring an intensity of the demodulated WCDMA pilot signal to generate an Ec/Io; a WCDMA modem and a CDMA-2000 modem for performing a call processing according to protocols defined by a WCDMA standard and a CDMA-2000 standard, respectively; a flash memory for storing therein a modem-to-modem switching program capable of performing a switching between the WCDMA modem and the CDMA-2000 modem based on the Ec/Io; and a controller for loading the modem-to-modem switching program and activating the CDMA-2000 modem if a time lapse during which the Ec/Io is maintained smaller than a predetermined CDMA-2000 ON threshold THON is greater than a preset CDMA-2000 ON condition time Hd.

Abstract: A transmission control apparatus of the present invention includes a reliable service unit for providing reliable peer-to-peer data communication at layer 2 of a TCP/IP stack, and a setup unit for setting the reliable service unit. The reliable service unit includes a fragmentation part for fragmenting a service data unit (SDU) from an upper layer into protocol data units (PDUs) of a predetermined length, a sending buffer for temporarily storing the PDUs from the fragmentation part, a receiving buffer for temporarily storing PDUs received through a communication channel, a reassemble part for assembling the PDUs stored in the receiving buffer to a SDU of the upper layer, a poller for controlling data transmission/reception by checking network conditions, and a control unit for controlling at least one of the fragmentation part, sending buffer, receiving buffer, reassemble part, and poller.