Software cdma throughput query


In TCP/ip data transmission using q2438 cdma chipset I will transmit 500 bytes to server ,and iam waiting for payload transmit indication(+wstx:500) and again iam sending next 500 bytes to server.
But this payload tranmit indication(+wstx:500) taking arround .8 seconds .
Finally my query
Is there any way to send 500 bytes data continiously without waiting for pay load transmission indication .or there is any to reduce waiting time for sending next data.Please help me regarding this.