WO2012109848A1

WO2012109848A1 - Signalling retransmission method, device and system based on stream control transmission protocol

Info

Publication number: WO2012109848A1
Application number: PCT/CN2011/077740
Authority: WO
Inventors: 牛晓莉; 朱伟
Original assignee: 华为技术有限公司
Priority date: 2011-07-28
Filing date: 2011-07-28
Publication date: 2012-08-23
Also published as: CN102308512A; CN102308512B

Abstract

Disclosed are a signalling retransmission method and device based on Stream Control Transmission Protocol (SCTP), including: numbering an independent signalling data packet and a plurality of verification data packets, and sending the numbered independent signalling data packet and plurality of verification data packets to a receiving end in turn according to the numbering; receiving SACK messages sent by the receiving end, and judging whether or not the number of received SACK messages has reached a preset value; when the number of received SACK messages reaches the preset value, determining that the signalling data packets corresponding to the same lost signalling data packet number in the plurality of SACK messages are lost; and sending the signalling data packets that are determined as being lost to the receiving end again. According to the method, a plurality of verification data packets is sent after an independent signalling data packet is sent; in this manner, whether or not the independent signalling data packet is lost can be judged by way of the plurality of verification data packets, and the SCTP lost signalling data packets can be effectively and promptly retransmitted after it is determined that signalling data packets are lost.

Description

Signaling retransmission method, device and system based on flow control transmission protocol

TECHNICAL FIELD The present invention relates to the field of communications technologies, and in particular, to a signaling retransmission method, apparatus, and system based on a flow control transmission protocol.

Background technique

Femto (femtocell) A network device that provides wireless access to home/enterprise users on a fixed IP transport network. As a complementary technology to WCDMA (Wideband Code Division Multiple Access) macrocells, operators can provide better wireless broadband voice services and data services to home users at a lower cost. As a new technology for fixed mobile convergence and a market convergence point for personal mobile communications and home broadband communications, Femto will be an important means for full-service operators to offer differentiated services. Since the IP network is transmitted between Femto and the core network, the damage of the transmission network has an important impact on the establishment of the Femto service and the quality of the service.

Currently, service-related signaling is transmitted using SCTP (Stream Control Transmission Protocol). When the congestion performance of the network decreases, network packet loss increases, transmission delay increases, and signaling and service data may not arrive on time. In the process of establishing a call, there are more than 10 pieces of mutual signaling between the HNB (Home NodeB, Home Node Station) and the HNB-GW (Home NodeB GateWay, the home base station gateway), and any loss of any signaling packets during the call will cause a timeout. The accumulation of time increases the call setup delay. When the packet loss is serious, the call setup fails. And for WCDMA other forms of base stations, such as Micro, Pico, because it also uses public network transmission, so the same problem exists. The same problem exists for other small base stations (GSM, CDMA, Wimax, LTE).

Summary of the invention

In view of this, the embodiments of the present invention provide a signaling retransmission method, apparatus, and system based on a flow control transmission protocol (SCTP) to implement SCTP signaling retransmission.

The technical solution provided by the embodiment of the present invention is as follows:

A signaling retransmission method based on a flow control transmission protocol (SCTP), comprising: Adding multiple verification data packets after the independent signaling data packet, numbering the independent signaling data packet and the multiple verification data packets, and numbering the independent signaling data packet and the multiple verification data packets according to the number Send to the receiving end in turn;

Receiving a selective acknowledgement SACK message sent by the receiving end, where the SACK message carries the number of the lost signaling data packet, and determines the number of SACK^Ls that receive the number of the same lost signaling data packet. Whether the preset value is reached;

Determining a signaling packet corresponding to the number of the same lost signaling packet in the plurality of SACK messages when the number of SACK messages receiving the number of the same lost signaling packet reaches a preset value Lost

The determined lost signaling data packet is sent to the receiving end.

The present invention further provides a signaling retransmission apparatus based on a flow control transmission protocol (SCTP), comprising: a numbering unit, configured to add a plurality of verification data packets after an independent signaling data packet, and to the independent signaling data packet And multiple verification packets are numbered;

a sending unit, configured to send the independent signaling data packet and the plurality of verification data packets after the numbering to the receiving end according to the number;

a first receiving unit, configured to receive a selective acknowledgement SACK packet sent by the receiving end, where the SACK packet carries a number of a lost signaling data packet;

a first determining unit, configured to determine whether the number of received SACK packets containing the same lost signaling data packet reaches a preset value;

a determining unit, configured to determine, when the determination result of the first determining unit is YES,

The signaling packet corresponding to the number of the same lost signaling packet in the SACK is lost;

And a retransmission unit, configured to send the determined lost signaling data packet to the receiving end.

The present invention also provides a signaling transmission system based on a flow control transmission protocol (SCTP), comprising: a signaling retransmission device and a signaling receiving device, where:

The signaling retransmission device includes:

a numbering unit, configured to add multiple verification data packets after the independent signaling data packet, and number the independent signaling data packet and the multiple verification data packets;

a sending unit, configured to send the independent signaling data packet and the plurality of verification data packets after the numbering to the signaling receiving device according to the number; a first receiving unit, configured to receive a selective acknowledgement SACK packet sent by the signaling receiving device, where the SACK packet carries a number of a lost signaling data packet;

a retransmission unit, configured to send the determined lost signaling data packet to the signaling receiving apparatus; the signaling receiving apparatus includes:

a second receiving unit, configured to receive an independent signaling data packet and multiple verification data packets sent by the signaling retransmission device;

a second determining unit, configured to determine, after each receiving the data packet, whether the number of the received independent signaling data packet and the plurality of verification data packets is continuous;

a SACK message generating unit, configured to generate a SACK message and send the SACK message to the signaling retransmission device, where the SACK message carries a lost signaling packet The number.

In the SCTP-based signaling retransmission method provided by the embodiment of the present invention, the transmitting end adds multiple verification data packets after the independent signaling data packet, and numbers the independent signaling data packet and the multiple verification data packets, and After the numbering, the independent signaling data packet and the plurality of verification data packets are sequentially sent to the receiving end according to the number, and when the transmitting end receives the number of SACK packets that are sent by the receiving end and contain the number of the same lost signaling data packet, After the preset value is reached, the signaling end packet corresponding to the number of the missing signaling packet in the multiple SACK messages is lost, and the signaling data packet is retransmitted to implement the lost signaling data. The package is effectively retransmitted in time.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

FIG. 1 is a flowchart of an SCTP-based signaling retransmission method according to an embodiment of the present invention; FIG. 2 is another flowchart of an SCTP-based signaling retransmission method according to another embodiment of the present invention; FIG. 3 is a schematic structural diagram of an SCTP-based signaling retransmission apparatus according to another embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an SCTP-based signaling transmission system according to still another embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. The described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

The various techniques described herein can be used in various wireless communication systems, such as current 2G, 3G communication systems and next generation communication systems, for example, the present invention is applicable to UMT, GSM (Global System for Mobile communications, Global System for Mobile Communications), GPRS (General Packet Radio Service), CDMA2000 (Code Division Multiple Access 2000), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronization Code) Multiple Access Access Technology, LTE (Long Term Evolution), WLAN (Wireless Local Area Network) / WiFi (Wireless Fidelity) and WiMAX ( Worldwide Interoperability for Microwave Access, Wireless networks such as the Worldwide Interoperability for Microwave Access.

In addition, the terms "system," and "network" are often used interchangeably herein.

"and / or" is just an association describing the associated object, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists separately, A and B exist simultaneously, and B exists separately Kind of situation. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship. In the existing SCTP protocol, although a selective acknowledgment and retransmission mechanism is provided, it confirms and retransmits the packet by judging whether the number of the subsequently arrived packet is consecutive to the number of the previously arrived packet. . When transmitting a data packet, according to the existing protocol, the transmitting end sequentially numbers each data packet, and the receiving end detects the packet loss or out-of-order according to whether the number of the subsequently received data packet is consecutive with the previous number. When the receiving end detects that the number of the data packet is not continuous, it immediately sends it to the sender. The terminal replies with a SACK (Selective Acknowledgement) message, which carries the number of the missing data packet. When the receiving end receives three SACK packets carrying the same missing packet number, it can confirm The packet is lost and retransmitted immediately.

This selective acknowledgment and retransmission mechanism mainly confirms the sequence number of the lost data packet by the arrival of subsequent data packets, and triggers packet loss retransmission. However, in practical applications, the inventor has found that for the case where the signaling data packet is fragmented, the subsequent packet cannot be used to trigger SACK and fast retransmission, for example: 1. In the Femto practical application, due to the small number of users under Femto, the signaling packet Discontinuity, that is, subsequent fragmented data packets cannot trigger SACK packets in time to perform packet loss confirmation. Therefore, when a signaling packet is lost, the initiator can only wait for the RTO (Recovery Time Object) timeout (usually 3s) before triggering the retransmission of the lost packet. In the scenario where the network is severely damaged, the loss of any signaling will cause the timeout period to be accumulated, which will increase the service establishment delay. If the packet loss is serious, the service establishment fails. Therefore, this existing selective confirmation and retransmission mechanism cannot achieve the effect of retransmission in Femto applications. Second, for small forms of WCDMA and other small base stations, although the number of users is relatively large, the situation of the user's simultaneous service establishment process is still very limited, and it cannot guarantee the effective use of the arrival of subsequent packets to trigger SACK messages. Therefore, the effect of retransmission is also not achieved. An embodiment:

FIG. 1 is a flowchart of a method for signaling retransmission based on SCTP according to an embodiment of the present invention. As shown in FIG. 1, the SCTP-based signaling retransmission method includes:

S11: The sending end adds multiple verification data packets after the independent signaling data packet, and numbers the independent signaling data packet and the multiple verification data packets, and numbers the independent signaling data packet and the multiple verification data packets according to the numbering. The numbering sequence is sent to the receiving end in turn.

In order to solve the problem that the subsequent data packets cannot trigger the SACK message in a timely manner, in the embodiment of the present invention, after each independent signaling data packet, multiple verification data packets can be added.

The function of multiple verification data packets is to increase the density of the data packets sent by the sender and reduce the transmission interval. When a certain signaling data packet is sent, multiple verification data packets and subsequent independent signaling data packets can trigger the reception. The SACK message is sent by the terminal, which reduces the acknowledgement and retransmission time of the packet loss of the signaling packet. In addition, in order to reduce the amount of data transmission, it can be constructed as small as possible when constructing the verification packet. Packet.

S12: The sending end receives the SACK packet sent by the receiving end, and determines whether the number of received SACK packets containing the same missing signaling data packet reaches a preset value.

Each time the receiving end detects that the number of the newly received data packet is not continuous with the number of the previously received data packet, it immediately replies with a SACK message to the transmitting end, and the SACK message carries the lost signaling data packet. The number.

In order to improve the fault tolerance of the system, a preset value of the number of SACK packets is set in the sending end, that is, when the number of SACK packets received by the transmitting end is less than a preset value, the data packet is considered to be missing. On the other hand, if the number of received SACK packets reaches a preset value, it is determined that the signaling packet corresponding to the number of the signaling packet carried in the SACK packet is lost. In addition, the number of SACK packets mentioned here reaches a preset value, which means that the number of SACK packets containing the same number of lost signaling packets reaches a preset value.

S13: The sender determines that the signaling packet is lost.

When the number of SACK messages containing the number of the same lost signaling data packet reaches the preset value, the signaling data packet corresponding to the number of the same lost signaling data packet in the multiple SACK messages is determined. Lost. For example, the number of the lost signaling packets carried in the first SACK packet is 1, and the number of the lost signaling packets carried in the second SACK packet is 1, 3, and the third SACK packet is carried in the third SACK packet. The number of the lost signaling packets is 1, 3, and 4, and the number of the same lost signaling packets carried in the three SACK packets is 1, that is, the number 1 packet is lost.

S14: The sending end sends the determined lost signaling data packet to the receiving end.

Since the number of the lost signaling packet has been determined in the above steps, it is necessary to retransmit the signaling packet corresponding to the lost signaling packet number to the receiving end in this step. Another embodiment:

FIG. 2 is another flow chart of a SCTP-based signaling retransmission method according to another embodiment of the present invention.

As shown in FIG. 2, the SCTP-based signaling retransmission method includes:

S21: The sender numbers the independent signaling data packet and the multiple verification data packets.

According to the existing STCP protocol, the sender will number each packet in the order in which it is sent. and Moreover, since the function of the multiple verification data packets is to verify whether the receiving end receives the independent signaling data packet after the independent signaling data packet is sent, it is only necessary to ensure that the sending order of the multiple verification data packets is located in the independent signaling data packet. Then you can. When the independent signaling data packet and the multiple verification data packets are numbered, the number of the multiple verification data packets may be sequentially located after the independent signaling data packet, or the number of the subsequent independent signaling data packet may be added to Between the numbers of multiple verification packets, for example: three independent signaling packets have three authentication packets, and the first independent signaling packet is numbered 1, then the first independent signaling packet The number of the three verification data packets may be 2, 3, and 4, respectively, or the number of the three verification data packets of the first independent signaling data packet is 2, 4, and 5, respectively, and the second independent signaling is performed. The number of the data packet is 3, no matter which of the above numbering methods, it does not affect the role of multiple authentication data packets.

S22: After the number is sent by the sending end, the independent signaling data packet and the multiple verification data packets are sequentially sent to the receiving end according to the numbering sequence.

S23: The receiving end detects whether the numbers of all received data packets are consecutive, and immediately generates a SACK message when the numbers of all received data packets are not consecutive.

When the receiving end receives the data packet, it will detect the number of all received data packets, that is, start detecting the number of the first received data packet, and check whether all the data packets are consecutive, and When there is a number discontinuity in all received packets, the missing number is recorded.

After each detection, if the number is not continuous, the receiving end will immediately generate a SACK message, and the SACK message carries the missing number, that is, the number corresponding to the lost data packet, and will be generated. The SACK packet is sent to the sender. If there is no number discontinuity, a SACK is generated and sent to the sender within the preset time. The lost packet number is empty in the SACK packet.

In the present invention, since each of the independent signaling data packets is followed by a plurality of verification data packets, the transmission density of the data packets is increased, the interval at which the receiving end receives the data packets is reduced, and an independent signaling data is included. After the packet is sent, whenever the receiving end receives a data packet (including the authentication data packet or the subsequent independent signaling data packet), the receiving end will detect the serial number of all the previously received data packets, if received. If the terminal does not receive the independent signaling data packet, the receiving end will trigger a SACK message after receiving each data packet. So for some signaling packets are scattered In this case, the SACK message can be triggered relatively quickly without relying on subsequent signaling packets.

S24: The receiving end sends the generated SACK packet to the sending end.

Whenever the receiving end generates a SACK packet, the SACK packet is sent to the sender to notify the sender whether the packet sent by the sender has a problem of loss or disorder.

S25: The sending end receives the SACK packet sent by the receiving end, and determines whether the number of received SACK packets containing the same missing signaling data packet reaches a preset value.

In order to improve the fault tolerance of the system, a preset value of the number of SACK packets is set in the sending end. That is, when the number of SACK packets received by the sending end is less than the preset value, the packet is considered to be missing. Or out of order, and if the number of received SACK packets reaches a preset value, it is determined that the signaling packet corresponding to the number of the signaling packet carried in the SACK packet is lost or out of order. In addition, the number of SACK packets mentioned here reaches a preset value, which means that the number of SACK packets containing the number of the same lost signaling packet reaches a preset value.

In addition, in view of the fact that the transmission of the authentication data packet may fail due to the uncertainty of the network transmission, in order to ensure that the transmitting end can receive at least the SACK message reaching the preset value when the signaling data packet is lost, in the embodiment of the invention The number of verification packets must be greater than or equal to the preset value. In addition, as stipulated in the existing protocol, when the sender receives three SACK messages having the same number of lost signaling packets, the signaling packet can be confirmed to be lost. Therefore, in the present invention, The preset value can be three, and the number of verification packets is at least three.

S26: The sender determines that the signaling packet is lost.

When the number of SACK messages receiving the number of the same lost signaling data packet reaches the preset value, the signaling data packet corresponding to the number of the lost signaling data packet in the multiple SACK messages is determined to be lost. .

S27: The sending end sends the determined lost signaling data packet to the receiving end.

Since the number of the lost signaling packet has been determined in the above steps, it is necessary to retransmit the signaling packet corresponding to the lost signaling packet number to the receiving end in this step. In the SCTP-based signaling retransmission method provided by the embodiment of the present invention, the transmitting end adds multiple verification data packets after the independent signaling data packet, and numbers the independent signaling data packet and the multiple verification data packets, and After the numbering, the independent signaling data packet and the plurality of verification data packets are sequentially numbered to the receiving end. Sending, when the sender receives the number of SACK packets with the same lost signaling packet sent by the receiving end and reaches the preset value, the sender and the number of the same signaling packet are lost in the multiple SACK packets. The corresponding signaling data packet is lost, and the signaling data packet is retransmitted, so that the lost signaling data packet can be effectively retransmitted in time.

Compared with the selective acknowledgment and retransmission mechanism provided in the existing SCTP protocol, the method adds multiple verification data packets after the independent signaling data packet, so that the transmission density of the data packet is increased, and the transmission interval is reduced. When the signaling data packet is fragmented, it is not necessary to rely on the subsequent signaling data packet, and the SACK message can be triggered relatively quickly. Therefore, it can be applied to a discrete isolated signaling interaction process based on the SCTP bearer, and the method can automatically trigger the fast retransmission of the SCTP bearer signaling by using the SCTP existing mechanism in the case of poor transmission quality, thereby effectively reducing the letter. The timeout retransmission wait time is reduced, the service establishment delay is reduced, and the service establishment success rate is improved. Another embodiment:

On the basis of the foregoing method embodiments, the present invention further provides an SCTP-based signaling retransmission apparatus. As shown in FIG. 3, the signaling retransmission apparatus 100 includes: a numbering unit 1, a sending unit 2, and a A receiving unit 3, a first determining unit 4, a determining unit 5 and a retransmission unit 6, in the signaling transmission system of the SCTP, the signaling retransmission device acts as a transmitting end.

The numbering unit 1 is configured to add multiple verification data packets after the independent signaling data packet, and number the independent signaling data packet and the multiple verification data packets.

The sending unit 2 is configured to send the independent signaling data packet and the plurality of verification data packets after the numbering to the receiving end according to the number.

The first receiving unit 3 is configured to receive a SACK message sent by the receiving end, where the SACK message carries the number of the lost signaling data packet.

The first determining unit 4 is configured to determine whether the number of received SACK packets containing the same lost signaling data packet reaches a preset value.

In the embodiment of the present invention, the preset value may be selected as three, and the number of the plurality of verification data packets is at least three.

The determining unit 5 is configured to determine, when the determination result of the first determining unit 4 is YES, the signaling packet loss corresponding to the number of the missing signaling packets in the plurality of SACK messages. The retransmission unit 6 is configured to send the determined lost signaling data packet to the receiving end. Yet another embodiment:

The embodiment of the present invention further provides an SCTP-based signaling transmission system. As shown in FIG. 4, the system includes: a signaling retransmission device 100 and a signaling receiving device 200.

In the SCTP signaling transmission system, the signaling retransmission device is used as a transmitting end. As shown in FIG. 2, it is a schematic structural diagram of the signaling retransmission device 100. The signaling retransmission device 100 includes a numbering unit 1 and a sending unit. 2. The first receiving unit 3, the first determining unit 4, the determining unit 5 and the retransmission unit 6.

The sending unit 2 is configured to sequentially send the independent signaling data packet and the plurality of verification data packets after the numbering to the signaling receiving device 200 according to the number.

The first receiving unit 3 is configured to receive the SACK message sent by the signaling receiving device 200, where the SACK message carries the number of the lost signaling data packet.

The first determining unit 4 is configured to determine the received number that contains the same lost signaling data packet.

Whether the number of SACK packets reaches the preset value.

The determining unit 5 is configured to determine, when the determination result of the first determining unit 4 is YES, the signaling packet loss corresponding to the number of the lost signaling data packets in the multiple SACK messages.

The retransmission unit 6 is configured to transmit the determined lost signaling data packet to the signaling receiving device 200.

In the signal transmission system of the SCTP, the signaling receiving device serves as a receiving end. As shown in FIG. 3, the signaling receiving device includes: a second receiving unit 7, a second determining unit 8, and a SACK message generating unit 9.

The second receiving unit 7 is configured to receive the independent signaling data packet and the multiple verification data packets sent by the signaling retransmission device 100;

The second determining unit 8 is configured to: after each receiving the data packet, determine whether the number of the received independent signaling data packet and the multiple verification data packets are consecutive; The SACK message generating unit 9 is configured to generate a SACK message and send the SACK message to the signaling retransmission device 100, where the SACK message carries a lost message, if the result of the second determining unit 8 is no. Let the number of the packet. A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can be referred to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present invention, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

The units described as separate components may or may not be physically separate, and the components displayed as the units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM, Read-Only Memory), A device that can store program code, such as a random access memory (RAM), a disk or an optical disk.

The above description is only a preferred embodiment of the present invention, and those skilled in the art can understand or implement the present invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

Rights request

A signaling retransmission method based on a flow control transmission protocol (SCTP), comprising: adding a plurality of verification data packets after the independent signaling data packet, and the independent signaling data packet and the plurality of verification data The packets are numbered, and the independent signaling data packet and the plurality of verification data packets after the numbering are sequentially sent to the receiving end according to the number;

Receiving the selective acknowledgement SACK packet sent by the receiving end, where the SACK packet carries the number of the lost signaling data packet, and determines the number of SACK packets that receive the number of the same lost signaling data packet. Whether the preset value is reached;

The determined lost signaling data packet is sent to the receiving end.

2. Method according to claim 1, characterized in that a plurality of authentication data packets are added after each individual signaling data packet.

The method according to claim 1 or 2, wherein the number of the verification data packets is greater than or equal to the preset value.

4. The method according to claim 1 or 2, wherein the preset value is three.

A signaling retransmission apparatus based on the flow control transmission protocol (SCTP), comprising: a numbering unit, configured to add a plurality of verification data packets after the independent signaling data packet, and to the independent signaling data The package and multiple verification packets are numbered;

a first receiving unit, configured to receive a selective acknowledgement SACK packet sent by the receiving end, where the SACK packet carries a number of the lost signaling data packet;

a determining unit, configured to: when the determination result of the first determining unit is yes, determine that the signaling data packet corresponding to the number of the same lost signaling data packet in the multiple SACK messages is lost;

6. The apparatus according to claim 5, wherein the number of the verification data packets is greater than the preset value.

7. The apparatus according to claim 5, wherein the preset value is three.

8. A signaling transmission system based on a flow control transmission protocol (SCTP), comprising: a signaling retransmission device and a signaling receiving device, wherein:

The signaling retransmission device includes:

a sending unit, configured to send the independent signaling data packet and the plurality of verification data packets after the numbering to the signaling receiving device according to the number;

a first receiving unit, configured to receive a selective acknowledgement SACK packet sent by the signaling receiving device, where the SACK packet carries a number of a lost signaling data packet;

The signaling packet corresponding to the number of the same lost signaling packet in the SACK message is lost;

9. The system according to claim 8, wherein the number of the verification data packets is greater than the preset value.

10. The system according to claim 8, wherein the preset value is three.