Information processing method and device

1. An information processing method, performed by a user equipment (UE) operating in a single registration mode, comprising:

receiving assistance information from a core network of a first network;

initiating an attaching or initial registration procedure according to the assistance information received from the first network when the UE is moving between the first network and a second network, the first and second networks utilizing different access technologies;

wherein the step of initiating an attaching or initial registration procedure according to the assistance information received from the first network when the UE is moving between the first network and a second network comprises:

determining whether the UE in single registration mode can be supported in the first network according to the assistance information received from the first network;

initiating the attaching or initial registration procedure when accessing the second network, if the UE in single registration mode cannot be supported in the first network;

wherein when the assistance information comprises Non-Access Stratum (NAS) level indication, the NAS level indication indicates that the single registration mode is not supported, or instructs to perform a reselection to the second network; and

when the assistance information comprises registration mode negotiated on the NAS level, the step of determining whether the UE in single registration mode can be supported in the first network according to the assistance information received from the first network comprises determining whether the UE in single registration mode can be supported in the first network according to a result of the registration mode negotiation.

2. The method according to claim 1 , wherein the step of initiating an attaching or initial registration procedure according to the assistance information received from a first network when the UE is moving between the first network and a second network comprises:

determining whether an access to the second network is needed according to the assistance information received from the first network;

initiating the attaching or initial registration procedure when accessing the second network, if the access to the second network is needed.

3. The method according to claim 2 , wherein the assistance information comprises: an instruction sent by a base station in the first network through an RRC message, the instruction comprising:

information about cells of the second network; or an indication that switching among different access technologies is not supported; or an instruction of performing a reselection to the second network.

4. The method according to claim 3 , wherein the RRC message is an RRC connection release message.

5. The method according to claim 4 , wherein the instruction is sent when the first network fails to switch among different access technologies.

6. The method according to claim 1 , wherein the assistance information comprises: an instruction sent by the core network in the first network through an NAS message, the instruction comprising: an instruction of performing a reselection to the second network.

7. A user equipment (UE) operating in a single registration mode, comprising a processor, a storage and a transceiver, wherein the transceiver is configured to receive and send data, and the processor is configured to read a program in the storage to execute the following processes:

receiving assistance information from a core network of a first network by the transceiver;

initiating an attaching or initial registration procedure according to the assistance information received from the first network when the user equipment is moving between the first network and a second network, the first and second networks utilizing different access technologies;

wherein the processor is configured to:

determine whether the UE in single registration mode can be supported in the first network according to the assistance information received from the first network;

initiate the attaching or initial registration procedure when accessing the second network, if the UE in single registration mode cannot be supported in the first network;

wherein

when the assistance information comprises Non-Access Stratum (NAS) level indication

the NAS level indication indicates that the single registration mode is not supported, or performing a reselection to the second network; and

when the assistance information comprises registration mode negotiated on the NAS level, the processor is configured to determine whether the UE in single registration mode can be supported in the first network according to a result of the registration mode negotiation.

8. The UE according to claim 7 , wherein the processor is configured to:

determine whether an access to the second network is needed according to the assistance information received from the first network;

initiate the attaching or initial registration procedure when accessing the second network, if the access to the second network is needed.

9. The UE according to claim 8 , wherein the assistance information comprises: an instruction sent by a base station in the first network through an RRC message, the instruction comprising:

information about a target cell of a different access technology; or an indication that switching among different access technologies is not supported; or an instruction of performing a reselection to the second network.

10. An information processing method, performed by a user equipment (UE) operating in a single registration mode, comprising:

receiving assistance information from a first network;

initiating an attaching or initial registration procedure according to the assistance information received from the first network when the UE is moving between the first network and a second network, the first and second networks utilizing different access technologies;

wherein the step of initiating an attaching or initial registration procedure according to the assistance information received from the first network when the UE is moving between the first network and a second network comprises:

determining whether the UE in single registration mode can be supported in the first network according to the assistance information received from the first network;

initiating the attaching or initial registration procedure when accessing the second network, if the UE in single registration mode cannot be supported in the first network;

wherein when the assistance information comprises

neighborhood measurement information, the step of determining whether the UE in single registration mode can be supported in the first network according to the assistance information received from the first network comprises determining that the UE in single registration mode cannot be supported in the first network, if the neighborhood measurement information does not comprise information about any cell of the access technology which the second network utilizes; and

when the assistance information comprises registration mode negotiated on a Non-Access Stratum (NAS) level, the step of determining whether the UE in single registration mode can be supported in the first network according to the assistance information received from the first network comprises determining whether the UE in single registration mode can be supported in the first network according to a result of the registration mode negotiation.