WO2008017235A1

WO2008017235A1 - A system, device and method for sms routing

Info

Publication number: WO2008017235A1
Application number: PCT/CN2007/002248
Authority: WO
Inventors: Dongming Zhu; Jianfeng Zhong
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-08-01
Filing date: 2007-07-24
Publication date: 2008-02-14
Also published as: CN101119293A

Abstract

A system, device and method for SMS routing are disclosed. To solve the problem that a CS-user can not send a SMS to a IP-user, a system comprising units following is proposed: a SMS gateway SMS-MGCF translates a massage from a CS-user into a packet with routing address and forwards the packet to S-CSCF; a I-CSCF is used to get the address of S-CSCF in which the called CS-user registered and forwards SMS from SMS-MGCF to S-CSCF; a S-CSCF forwards the SMS to the destination-user.

Description

System, device and method for short message routing

The present invention relates to the field of communications, and in particular, to a system, apparatus, and method for short message routing. Background technique

The short message service provides a method of delivering a message of a certain size between terminals, and has successfully obtained a successful application in the cellular network of the CS domain. Its implementation introduces a network entity called a short message center that relies on a short message center to enable short message forwarding, storage, delayed transmission, and other value-added services. At the same time, the GSM/UMTS PLMN needs to support the forwarding function of short messages between the short message center and the terminal.

The 3GPP R5 phase introduces the IP Multimedia Subsystem, which is a subsystem above the packet domain of the existing network. The packet domain is used as the bearer channel for the upper layer control signaling and media transmission, and the SIP protocol is introduced as the service control protocol. Utilizing the simplicity, easy extension, and convenient combination of media, SIP provides a rich multimedia service by separating service control from bearer control. IMS's network convergence solution enables operators to provide the same services for fixed and mobile users based on a unified core network. The network architecture of the core network of the fixed network and the mobile network can not only reduce the complexity of the network structure, but also Reduce the operation and maintenance costs of the network.

Because of the successful application of short message services in existing cellular systems, 3GPP is considering extending short message services to IP connections in non-cellular networks. In TISPAN, it has been specified that short messages in the IMS domain are stored and forwarded by the AS in the IMS domain, and the processing of supplementary services. In 3GPP, the short message flow in the IMS domain has not been considered yet.

The short message interworking network architecture (SMS OVER IP) currently implemented in 3GPP, as shown in Figure 1, where:

SMSC: Short Message Service Center, Short Message Service Center. Responsible for relaying, storing or forwarding short messages between the base station and the SME; the protocol of the mobile station (ME) to the SMSC can transmit short messages from the mobile station or towards the mobile station, the protocol name is SMTP (Short Message Transmission) T N2007/002248

Protocol ).

SMS-IWMSC/GMSC: SMS-Gateway MSC, SMS Gateway. The short message sent by the SMSC is received, the routing information is queried to the HLR, and the short message is transmitted to the switching center of the base station where the receiver is located.

IP-SM-GW: IP Short Message Gateway IP SMS Gateway. The IP-SM-GW provides an interworking function for transmitting short messages between the UE and the GSM/UMTS network, and can be used as an IP-SM-GW entity by the AS in the IMS.

HLR7HSS: Home Location Register Home Location Register / Home Subscriber Server Home Subscriber Server. Provide routing functions for SMS services. When the MT (terminating the short message flow), the routing request message is sent by the GMSC to the HLR/HSS. If the UE has previously registered the IP-SM-GW address by registration, the IP-SM-GW needs to be used in the routing response message. The address in E164 format is returned to the GMSC.

The registration process under the network architecture is shown in Figure 2 and includes the following steps:

1. The UE initiates a normal registration/re-registration process in the IMS domain.

2. The S-CSCF checks the triggering rule, finds the address of the IP-SM-GW, and triggers the third-party registration process.

3. The IP-SM-GW stores the address of the S-CSCF.

4. The IP-SM-GW initiates the registration process to the HSS/HLR.

5. The HSS/HLR stores the E164 address information of the IP-SM-GW and returns a response.

6. The IP-SM-GW returns a response to the S-CSCF.

7. The S-CSCF returns a response to ΌΈ.

The short message MT process under the network architecture is shown in Figure 3 and includes the following steps:

1. The UE registers with the S-CSCF through the IMS registration process, and executes the above short message registration process.

2. The SM-SC forwards the SMS message to the SMS-GMSC.

3. The SMS-GMSC sends a routing request to the HLR/HSS, which includes an indication flag SMS-GMSC supporting IP message routing. 4. The HSS/HLR returns the E.164 address of the IP-Message-GW registered at the time of user registration.

5. The SMS-GMSC sends a message to the IP-Message-GW, which carries the MSISDN of the UE.

6. Convert the MSISDN to TelUri and find the corresponding S-CSCF address according to TelUrl.

7. The IP-Message-GW sends the SMS to the S-CSCF.

8. The S-CSCF forwards the SIP MESSAGE to the UE.

9. The UE returns a 200 OK response to the S-CSCF.

10. The S-CSCF sends a 200 OK to the IP-Message-GW.

11. The UE sends a report to the S-CSCF through the SIP MESSAGE.

12. The S-CSCF forwards the SIP MESSAGE to the IP-Message-GW according to the filtering rule. 13. The IP-Message-GW sends a delivery report to the SMS-GMSC.

14. SMS-GMSC sends and submits 4 notification status to HLR/HSSo

15. The SMS-GMSC sends a report to the SM-SC.

16. The IP-Message-GW acknowledges the message to the S-CSCF through 200 OK.

17. The S-CSCF acknowledges the message to the UE through 200 OK.

During the process of the invention, the inventor found that the short message from the CS domain to the IMS domain is on the route of the IP-SM-GW to the S-CSCF, and relies on the registration of the third party to ensure that the relationship is relatively fixed and cannot use the original The IMS routing mode performs flexible routing. · Summary of the invention

The embodiment of the invention provides a system, a device and a method for short message routing, so that the short message of the CS domain to the IMS domain can be flexibly routed by using the original IMS domain routing mode. .

The system of the embodiment of the present invention includes: a short message gateway SMS-MGCF, configured to translate short messages sent by the CS domain, and perform routing addressing and forwarding of the called short messages by the translated short message; I-CSCF, Obtaining the address of the S-CSCF to which the called party belongs, and forwarding the short message sent by the SMS-MGCF to the S-CSCF; and the S-CSCF, for forwarding the short message sent by the I-CSCF to the called party.

The short message gateway of the embodiment of the present invention includes: a translation unit, which is used to send a short message to the CS domain. The N2007/002248 is translated; the addressing unit is configured to perform routing of the called message on the short message; and the forwarding unit is configured to forward the short message according to the addressing result of the addressing unit.

The method of the embodiment of the present invention includes the following steps: after the short message sent by the CS domain enters the IMS domain, the short message is translated by the SMS-MGCF; and the SMS-MGCF performs the called route addressing of the translated short message. And forwarding.

In the embodiment of the present invention, part of the functions of the existing IP-SM-GW are split out of the new network element of the SMS-MGCF, and the short message sent by the CS domain is translated by the SMS-MGCF, and the short message is called. Route addressing and forwarding. Therefore, it is not necessary to rely on the registration of the third party to implement the routing of the short message, but according to the routing manner of the existing IMS domain, the I-CSCF and the HLR/HSS are sequentially used to query the called S-CSCF for flexible operation. routing. DRAWINGS

FIG. 1 is a network architecture of short message interworking implemented in the existing 3GPP;

Figure 2 is a flow chart of registration under the existing network architecture;

Figure 3 is a flow chart of the final short message in the existing network architecture;

4 is a schematic structural diagram of a system according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a system preferred embodiment according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of a short message gateway according to an embodiment of the present invention;

7 is a flow chart of steps of a method according to an embodiment of the present invention;

8 is a signaling flowchart of a method 1 of the method of the present invention;

9 is a signaling flowchart of a method 2 of the method of the present invention;

10 is a flowchart of terminal registration signaling in Example 3 of the method according to the present invention;

FIG. 11 is a flow chart of the signaling of the combined judgment of the called terminal capability and the iFC in the third example of the method of the present invention. detailed description

In order to achieve the routing of short messages without relying on the registration of a third party, the CS domain to the IMS domain The short message can be flexibly routed by using the original IMS domain routing manner. The embodiment of the present invention provides a short message routing system. As shown in FIG. 4, the method includes: a short message routing network element SMS in the CS domain. -IWMSC/GMSC, and SMSC, MSC and HLR7HSS respectively connected to SMS-IWMSC/GMSC; short message routing network elements SMS-MGCF, I-CSCF, S-CSCF and BGCF (edge gateway control functions) in the IMS domain The entity Border Gateway Control Function); the SMS-MGCF is also connected to the SMS-IWMSC/GMSC.

The SMS-IWMSC/GMSC, SMSC, MSC and HLR/HSS are used to route short messages of the CS domain to the IMS domain.

The SMS-MGCF may be combined with the MGCF entity for translating the short message sent by the CS domain, and performing routing and forwarding of the called message to the translated short message. If stated

If the SMS-MGCF is addressed to the local domain, the SMS-MGCF directly forwards the translated short message to the I-CSCF of the local domain; if the SMS-MGCF is addressed to its domain, the SMS-MGCF performs an ENUM query operation. The address of the I-CSCF to which the called party belongs is found, and then the translated short message is forwarded to the I-CSCF.

The I-CSCF is configured to obtain an address of the S-CSCF to which the called party belongs, and forward the short message sent by the SMS-MGCF to the S-CSCF.

The BGCF is configured to select an SMS-MGCF to send a short message to the CS domain when sending a short message from the IMS to the CS domain.

The S-CSCF is configured to forward the short message sent by the I-CSCF to the called party.

Further, in order to implement the interworking of the short message from the CS domain to the IMS domain, the system of the embodiment of the present invention provides a preferred solution. Referring to FIG. 5, the system further includes: a determining unit connected to the S-CSCF, and Describe the SMS-AS connected to the single.

The SMS-AS is configured to implement translation of the encapsulated SMS message and the IMS text message. The SMS-AS can also serve as the SMSC in the IMS domain to implement the processing, forwarding and supplementary service processing of short messages in the IMS domain.

The determining unit is configured to determine, according to the format of the short message received by the S-CSCF and the receiving capability of the called user, if the format of the short message matches the receiving capability of the called user, Forwarding the short message to the called party; otherwise, triggering the short message to the SMS-AS for format conversion. The judging unit may be placed in the S-CSCF or placed in the SMS-AS according to the judgment mechanism.

Referring to FIG. 6, the SMS-MGCF (ie, the SMS-MGCF in the embodiment of the present invention) in the system of the embodiment of the present invention includes a translation unit, an addressing unit, and a forwarding unit that are sequentially connected.

The translation unit is configured to translate a short message sent by the CS domain.

The addressing unit is configured to perform routing addressing of the called message on the short message.

The forwarding unit is configured to forward the short message according to an addressing result of the addressing unit.

The embodiment of the present invention further provides a method for short message routing. Referring to FIG. 7, the following main steps are included:

51. The short message sent by the CS domain enters the IMS domain.

After the short message sent by the CS domain enters the IMS domain, it first passes through the SMS-MGCF.

52. The SMS-MGCF translates the short message.

The SMS-MGCF translates the MAP message of the CS domain into the SIP message of the IMS domain, and indicates the translated SIP message to distinguish the SIP message from the IMS domain to the IMS domain.

53. The SMS-MGCF performs routing of the called party on the translated short message.

There are two cases in this step.

Case 1: When the SMS-MGCF is addressed to the local domain, the SMS-MGCF directly forwards the translated short message to the I-CSCF of the local domain.

Case 2: The SMS-MGCF is addressed to its domain, and the SMS-MGCF performs an ENUM query operation to find the address of the I-CSCF to which the called party belongs; and then forwards the translated short message to the I-CSCF.

54. Forward the translated short message to the called party.

After receiving the translated short message, the I-CSCF queries the HSS to query the address of the S-CSCF to which the called party belongs, and forwards the translated short message to the S-CSCF.

After that, the first short message may be sent to the IMS domain if the IMS domain is sent to the IMS domain. , without subsequent judgment, can be forwarded directly to the called; if there is a translation N2007/002248 indicates that the short message sent by the CS domain to the IMS domain is determined, and subsequent judgment is required.

Finally, judging according to the format of the short message and the receiving capability of the called user, if the format of the short message matches the receiving capability of the called user, the short message is directly forwarded to the called party; otherwise, the After the short message is triggered to the SMS-AS for format conversion, it is forwarded to the called party.

Whether the determination triggers a format conversion to the SMS-AS includes, but is not limited to, the following three implementation modes.

Implementation 1: When the terminal registers, it notifies the S-CSCF whether the capability information of the encapsulated SMS format message is supported. When the S-CSCF receives the short message, it combines the iFC and the terminal capability information to determine whether the called terminal supports the encapsulation of the SMS format message. To decide whether to trigger a format conversion to SMS-AS.

Implementation 2: The user signs the contract according to the capabilities of the terminal; when receiving the short message, the S-CSCF determines whether to trigger the format conversion to the SMS-AS according to the subscription data of the called user; after triggering to the SMS-AS, SMS-AS It is determined whether the capability information of the called terminal matches the format of the current short message to determine whether to perform format conversion. The SMS-AS in the implementation manner obtains the capability information of the called terminal by using one of the following methods: When the terminal registers, the SMS-AS is notified by the third party registration whether it supports the information of the encapsulated SMS format message; SMS-AS The terminal capability information is subscribed to the network entity capable of sensing the terminal capability, so as to know whether the terminal supports the information of the encapsulated SMS format message. The SMS-AS learns whether the terminal supports the information of the encapsulated SMS format message by using the device management DM mode.

Implementation 3: The SMS-AS knows whether the terminal supports the capability information for encapsulating the SMS format message. When the S-CSCF receives the short message, the S-CSCF unconditionally triggers the SMS-AS according to the subscription data. The SMS-AS determines whether the called terminal supports the encapsulated SMS format. Message to decide whether to convert the format. The manner in which the SMS-AS in the implementation manner knows whether the terminal supports the information of the encapsulated SMS format message includes the following ones: When the terminal registers, the third-party registration informs the SMS-AS whether it supports the information of the encapsulated SMS format message; or The SMS-AS subscribes to the terminal capability information to the network entity that can be aware of the terminal capability, so as to know whether the terminal supports the information of the encapsulated SMS format message; or the SMS-AS knows whether the terminal supports the information of the encapsulated SMS format message through the device management DM mode.

The following is specifically described by three examples.

Method Embodiment 1: A short message in the CS domain is sent to the user in the IMS domain, and the S-CSCF is based on the end. The end capability and the iFC trigger determine that the SMS-AS performs format conversion (the first implementation in step S4), or triggers the determination of the SMS-AS for format conversion according to the subscription information of the user (the implementation mode 2 in step S4). Referring to Figure 8, the following specific steps are included:

Step 1-2. The UE1 sends a short message to the MSC, and the MSC sends a response to the UE1.

Step 3 - 4. The MSC sends a message to the SMSC, and the SMSC responds to the MSC.

Step 5: 6. The SMSC takes the routing information from the HSS/HLR, and the HSS/HLR returns the address of the SMS-MGCF.

Step 7 - 8. The SMSC sends a short message to the SMS-MGCF, and the SMS-MGCF returns a response to the SMSC. The SMS-MGCF converts the message into a short message in a SIP-encapsulated SMS format.

Step 9 - 10. The SMS-MGCF sends a short message to the I-CSCF, and the I-CSCF returns a response to the SMS-MGCF.

Step 11-12: The I-CSCF to the HSS/HLR obtains the address of the S-CSCF where the called party is located.

Step 13 - 14. The I-CSCF sends a short message to the S-CSCF.

Step 15: The S-CSCF determines whether it needs to trigger the conversion to the SMS-AS according to the terminal capability and the iFC trigger, or judge according to the subscription information of the user. If necessary, perform steps 16 - 19, otherwise go directly to steps 20 - 21.

Steps 16 - 17, trigger the SMS-AS to convert the short message into text format.

Steps 18 - 19, SMS-AS sends a text format short message back to the S-CSCF.

Step 20 - 21, the S-CSCF sends a short message in text format to UE2, and UE2 returns a response to the S-CSCF.

Method Embodiment 2: A short message in the CS domain is sent to the user in the IMS domain, and the subscription information of the user is unconditionally triggered to the SMS-AS, and the SMS-AS determines whether to perform format conversion (the third implementation manner in step S4). See Figure 9 for the following specific steps:

Step 5 - 6. The SMSC to HSS HLR takes the routing information, and the HSS/HLR returns the address of the SMS-MGCF. Step 7 - 8. The SMSC sends a short message to the SMS-MGCF, and the SMS-MGCF returns a response to the SMSC. The SMS-MGCF converts the message into a short message in a SIP-encapsulated SMS format.

Step 13 - 14. The I-CSCF sends a short message to the S-CSCF.

Step 15 - 16. The S-CSCF determines that this is a packaged SMS format message, and the format conversion is unconditionally triggered to the SMS-AS according to the 'home subscription information.

Step 17. The SMS-AS determines and processes the format conversion according to the capability information of the terminal registration and the format of the current message.

Steps 18 - 19, the SMS-AS sends the processed short message to the S-CSCF.

Step 20 - 21: The S-CSCF sends a short message to the UE2, and the UE2 returns a response to the S-CSCF. Method Embodiment 3: The S-CSCF determines according to the trigger of the capability of the user terminal (the implementation mode 1 in step S4).

The terminal registration process, as shown in Figure 10, includes the following specific steps:

Step 1: The UE sends a registration message to the S-CSCF, where the capability information that does not support the short message of the SMS format is carried.

Step 2. The S-CSCF stores the terminal short message capability information of the UE.

Step 3. The S-CSCF returns a response to the UE.

Note: The processing of P-CSCF and I-CSCF is omitted in this procedure.

After receiving the short message, the S-CSCF comprehensively judges the short message capability of the called terminal and the trigger of the iFC, as shown in FIG. 11, and includes the following specific steps:

Step 1. The S-CSCF receives the short message.

Step 2. The S-CSCF returns a response to receive the short message.

Step 3: The S-CSCF does not directly trigger according to the iFC rule, but triggers the triggering logic of the ^iFC and the terminal capability information previously obtained through the registration message sent by the UE, and needs to be triggered to the SMS-AS. Step 4: The S-CSCF triggers a short message to the SMS-AS for format conversion.

In summary, the embodiment of the present invention splits some functions of the existing IP-SM-GW out of the new network element of the SMS-MGCF, and the short message sent by the CS domain is translated by the SMS-MGCF, and the short message is The message is routed and forwarded by the called party. Therefore, it is not necessary to rely on the registration of the third party to implement the routing of the short message, but according to the routing manner of the existing MS domain, the I-CSCF and the HLR/HSS are sequentially used to query the called S-CSCF for flexible operation. routing.

Further, the system of the embodiment of the present invention splits part of the functions of the existing IP-SM-GW out of the new network element of the SMS-AS, and determines whether the S-CSCF or the SMS-AS determines whether the short message is forwarded to the called party. The short message format conversion is required. If necessary, the SMS-AS is triggered to perform format conversion; otherwise, it is directly forwarded to the called party. Because of the short message routing scheme based on the embodiment of the present invention, it is determined whether the short message format conversion needs to be performed, and the format conversion process does not need to be performed by the CS-domain entering the first node IP-SM-GW of the IMS domain. Therefore, the possibility of being modified by the intermediate link network element is avoided, and the success of the short message intercommunication is guaranteed.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request

A short message routing system, comprising: a short message routing network element in a CS domain, wherein the system further comprises:

The short message gateway SMS-MGCF is used for translating the short message sent by the CS domain, and performing routing and forwarding of the called message on the translated short message;

An I-CSCF, configured to obtain an address of the S-CSCF to which the called party belongs, and forward the short message sent by the SMS-MGCF to the S-CSCF;

The S-CSCF is used to forward the short message sent by the I-CSCF to the called party.

2. The system according to claim 1, wherein if the SMS-MGCF is addressed to the local domain, the SMS-MGCF directly forwards the translated short message to the I-CSCF of the local domain.

3. The system according to claim 1, wherein if the SMS-MGCF is addressed to its domain, the SMS-MGCF performs an ENUM query operation to find the address of the I-CSCF to which the called party belongs, and then translates The subsequent short message is forwarded to the I-CSCF.

4. The system of claim 1 wherein the SMS-MGCF is integrated with the MGCF entity.

The system according to any one of claims 1 to 4, wherein the system further comprises: a determining unit, configured to perform, according to a format of the short message received by the S-CSCF and a receiving capability of the called user. It is determined that when the format of the short message matches the receiving capability of the called user, the short message is directly forwarded to the called party.

The system according to any one of claims 1 to 4, wherein the system further comprises: a short message application server SMS-AS, configured to implement conversion of the encapsulated SMS message and the IMS text message;

a judging unit, configured to judge according to a format of the short message received by the S-CSCF and a receiving capability of the called user, and when the format of the short message does not match the receiving capability of the called user, trigger the short message to The SMS-AS performs format conversion.

The system according to claim 6, wherein said SMS-AS doubles as an IMS domain The SMSC is used to implement the processing of storing, forwarding, and supplementing short messages in the IMS domain.

8. The system of claim 6, wherein the determining unit is placed in the S-CSCF.

9. The system of claim 6 wherein said determining unit is placed in an SMS-AS.

10. A short message gateway, comprising:

a translation unit, configured to translate short messages sent from the CS domain;

An addressing unit, configured to perform routing addressing of the called message on the short message;

And a forwarding unit, configured to forward the short message according to the addressing result of the addressing unit.

The short message gateway according to claim 10, wherein if the addressing unit is addressed to the local domain, the addressing unit directly forwards the translated short message to the I-CSCF of the local domain.

12. The short message gateway according to claim 10, wherein if the addressing unit is addressed to its domain, the addressing unit performs an ENUM query operation to find the address of the I-CSCF to which the called party belongs, and then The translated short message is forwarded to the I-CSCF.

A method for routing short messages, comprising the steps of:

After the short message sent by the CS domain enters the IMS domain, the short message is translated by the SMS-MGCF;

The SMS-MGCF performs routing and forwarding of the called message to the translated short message.

14. The method according to claim 13, wherein the SMS-MGCF performs route addressing and forwarding of the called party for the short message, and includes the following sub-steps:

- the SMS-MGCF is addressed to the domain;

- The SMS-MGCF directly forwards the translated short message to the I-CSCF of the domain;

- the I-CSCF goes to the HSS to query the address of the S-CSCF to which the called party belongs, and forwards the translated short message to the S-CSCF;

- The S-CSCF sends the translated short message to the called party.

15. The method according to claim 13, wherein the SMS-MGCF performs route addressing and forwarding of the called message to the short message, and includes the following sub-steps: - the SMS-MGCF is addressed to its domain;

- The SMS-MGCF performs an ENUM query operation to find the address of the I-CSCF to which the called party belongs; - the SMS-MGCF forwards the translated short message to the I-CSCF;

- the I-CSCF goes to the HSS to query the address of the S-CSCF to which the called party belongs, and forwards the translated short-message to the S-CSCF;

- The S-CSCF sends the translated short message to the called party.

The method according to claim 14 or 15, wherein the SMS-MGCF translates the MAP message of the CS domain into a SIP message of the IMS domain.

The method according to claim 16, wherein the SMS-MGCF indicates the translated SIP message, and if the short message received by the S-CSCF carries the indication, the short message needs to be according to the short message. The format and the receiving ability of the called user are judged.

The method according to claim 17, wherein after the translated short message is forwarded to the S-CSCF, it is determined according to the format of the short message and the receiving capability of the called user, if the short message If the format matches the receiving capability of the called user, the short message is directly forwarded to the called party; otherwise, the short message is triggered to the SMS-AS for format conversion, and then forwarded to the called party.

The method according to claim 18, wherein the determining according to the format of the short message and the receiving capability of the called user includes the following sub-steps:

- when the terminal registers, it informs the S-CSCF whether it supports the capability information for encapsulating the SMS format message;

When the S-CSCF receives the short message, it determines whether the called terminal supports the encapsulation of the SMS format message by using the initial filtering rule iFC and the terminal capability information to determine whether to trigger the format conversion to the SMS-AS.

- the user signs the contract according to the capabilities of the terminal;

-S-CSCF, when receiving the short message, judges whether to trigger the format conversion to the SMS-AS according to the subscription data of the called user;

- After triggering to the SMS-AS, the SMS-AS determines the capability information of the called terminal and the current short message. Whether the format matches to determine whether to convert the format.

The method according to claim 20, wherein the SMS-AS obtains capability information of the called terminal by one of the following methods:

When the terminal registers, it notifies the SMS-AS whether it supports the information of the SMS formatted message through the third party registration;

The SMS-AS subscribes to the terminal capability information to the network entity capable of sensing the terminal capability, so as to know whether the terminal supports the information for encapsulating the SMS format message;

The SMS-AS learns whether the terminal supports the information of the SMS formatted message through the device management DM mode.

- SMS-AS knows whether the terminal supports capability information for encapsulating SMS format messages;

- When the S-CSCF receives the short message, it triggers unconditionally to the SMS-AS according to the subscription data;

- The SMS-AS determines whether the called terminal supports the encapsulation of SMS format messages to determine whether to perform a format conversion.

The method according to claim 22, wherein the manner in which the SMS-AS knows whether the terminal supports information for encapsulating an SMS format message includes one of the following:

When the terminal registers, it notifies the SMS-AS whether it supports the message encapsulated in the SMS format through the third party registration;