In order to meet the IP-based requirements of 3G networks.PTN technology will be the main carrying technique for 3G wireless access network.The IMA technology defines a methodology to provide inverse multiplexing of a high-speed ATM cell stream over multiple low-speed physical links and to retrieve the original stream at the far-end from these physical links.IMA technology break through the limit of single physical's rate and improve the bandwidth utilization.Therefore.IMA is widely used in 3G wireless acce...