Method for establishing HRPD network packet data service in 1x network

A method for establishing a High Rate Packet Data (HRPD) network packet data service in a 1x network, comprising:nreceiving, by a target Access Network/Packet Control Function (AN/PCF) of an HRPD network, a session establishment request from an Access Terminal (AT) through a channel on an air interface of the 1x network, wherein the AT is in a service in the 1x network and has an existing dormant session with the HRPD network;establishing, by the target AN/PCF, an HRPD session with the AT after obtaining session information of the existing dormant HRPD session;performing, by the target AN/PCF and the AT, a session configuration based on the obtained session information, and establishing a data connection for an HRPD network packet data service,wherein the channel is newly created on the air interface of the 1x network, and before the step of receiving a session establishment request from the AT, the method further comprises:ncreating, by the AT, the channel on the air interface of the 1x network to bear an information flow between the AT and the HRPD network,wherein the step of creating the channel on the air interface of the 1x network to bear the information flow between the AT and the HRPD network comprises:nsending, by the AT, an enhanced origination message to the BS;sending, by the BS, an adding service request to a Mobile Switching Center (MSC) after returning a BS acknowledgement instruction to the AT;returning, by the MSC, an assignment request;sending, by the AT, to the BS a service request which comprises a service configuration information record comprising a multiplex option, a traffic channel request and a service ID; andreturning, by the BS, a service connection response which comprises a valid starting time of the service configuration and a service configuration information record comprising a multiplex option, a traffic channel assignment and a service ID.