CN102905201B - The session service control method of EPON and optical line terminal - Google Patents

Abstract

The present invention provides a passive optical network session service control method and an optical line terminal, wherein the passive optical network session service control method includes: the optical line terminal receives a session call containing a called terminal device identifier sent by a calling terminal device request; the optical line terminal determines whether the called terminal equipment is a subordinate terminal equipment of the optical line terminal according to the identifier of the called terminal equipment; if so, the optical line terminal sends a session call request to the called terminal equipment; the optical line terminal receives the called terminal equipment The call response message fed back by the terminal equipment; the optical line terminal establishes a media stream transmission channel between the calling terminal equipment and the called terminal equipment. By adopting the passive optical network session service control method and the optical line terminal provided by the invention, session service backup can be provided for the passive optical network, and the load of the core network can be reduced.

Description

Session service control method and optical line terminal for passive optical network

technical field

The invention relates to communication technology, in particular to a passive optical network session service control method and an optical line terminal.

Background technique

PON (Passive Optical Network, Passive Optical Network) is a point-to-multipoint optical access network. ) There are only passive components in the optical distribution network between.

The PON network adheres to the principle of separation of call and bearer. Through the built-in IAD (Integrated Access Device, integrated access device) in the ONU, it only provides access to conversational services such as ordinary voice and video calls, and the service control needs to be controlled by its upper layer IMS ( IP MultimediaSubsystem, IP Multimedia Subsystem) or soft switching system is completed. When a terminal device accesses a session service, it needs to perform service control through the core network.

However, once the upper-layer network of the OLT fails, all session services on the lower band will be interrupted; moreover, the session services between any two terminal devices need to be controlled through the core network, which also causes a large load on the core network .

Contents of the invention

The invention provides a passive optical network session service control method and an optical line terminal, which provide session service backup for the passive optical network and reduce core network load.

The present invention provides a session service control method of a passive optical network, including:

The optical line terminal receives the session call request including the identifier of the called terminal device sent by the calling terminal device;

The optical line terminal determines whether the called terminal device is a terminal device subordinate to the optical line terminal according to the called terminal device identifier;

If yes, the optical line terminal sends the session call request to the called terminal device;

receiving, by the optical line terminal, a call response message fed back by the called terminal device;

The optical line terminal establishes a media stream transmission channel between the calling terminal device and the called terminal device.

The present invention also provides an optical line terminal, including:

A receiving module, configured to receive a session call request sent by the calling terminal device and including the identifier of the called terminal device;

A determining module, configured to determine whether the called terminal device is a terminal device subordinate to the optical line terminal according to the called terminal device identifier;

A call processing module, configured to send the session call request to the called terminal device if so;

The channel establishment module is configured to receive the call response message fed back by the called terminal device, and establish a media stream transmission channel between the calling terminal device and the called terminal device.

The session service control method of the passive optical network and the optical line terminal of the present invention determine whether the calling terminal device and the called terminal device are terminal devices subordinate to the same OLT through the OLT and establish a service channel between the terminal devices subordinate to the same OLT, so as to realize It provides the function of conducting internal conversations between terminal devices subordinate to the same OLT without the control of the core network, and solves the defect that the core network is required to control the session services of the terminal devices in the PON, resulting in excessive load on the core network.

Description of drawings

FIG. 1 is a flowchart of Embodiment 1 of a session service control method for a passive optical network according to the present invention;

FIG. 2 is a flow chart of Embodiment 2 of the session service control method of the passive optical network according to the present invention;

FIG. 3 is a flow chart of Embodiment 3 of a session service control method for a passive optical network according to the present invention;

FIG. 4 is a flow chart of Embodiment 4 of a session service control method for a passive optical network according to the present invention;

FIG. 5 is a flow chart of Embodiment 5 of a session service control method for a passive optical network according to the present invention;

FIG. 6 is a structural diagram of Embodiment 1 of the optical line terminal of the present invention;

FIG. 7 is a structural diagram of Embodiment 2 of the optical line terminal of the present invention;

FIG. 8 is a structural diagram of Embodiment 4 of the optical line terminal of the present invention.

Detailed ways

FIG. 1 is a flow chart of Embodiment 1 of a session service control method for a passive optical network according to the present invention. As shown in FIG. 1 , the method of this embodiment includes:

In step S101, the optical line terminal receives a session call request including the identifier of the called terminal device sent by the calling terminal device.

Specifically, an optical line terminal OLT may have several user-end equipment ONUs, and each ONU may provide several terminal equipments with session services through its built-in IAD. When a terminal device needs to conduct a session service with another terminal device, the calling terminal device first sends a session call request to the OLT, and the session call request includes the identifier of the called terminal device.

In step S102, the optical line terminal determines whether the called terminal device is a terminal device subordinate to the optical line terminal according to the identifier of the called terminal device.

Specifically, the OLT stores a list of terminal equipment identification information. After receiving the session call request sent by the calling terminal equipment, the OLT judges whether the called terminal equipment identification is recorded according to the called terminal equipment identification carried in the session call request. In the identification information list, it is determined whether the called terminal device is a terminal device subordinate to the OLT.

Step S103, if yes, the optical line terminal sends a session call request to the called terminal device.

Specifically, if the OLT determines that the called terminal device is a terminal device subordinate to the OLT, the OLT forwards the session call request sent by the calling terminal device to the called terminal device without forwarding the message through the core network.

In step S104, the optical line terminal receives the call response message fed back by the called terminal device.

Specifically, after receiving the session call request forwarded by the OLT, the called terminal device confirms acceptance of the call request, and sends a call response message to the OLT.

In step S105, the optical line terminal establishes a media stream transmission channel between the calling terminal device and the called terminal device.

Specifically, the OLT forwards the call response message sent by the called terminal device to the calling terminal device, notifies the calling terminal device that the called terminal device has confirmed the call request, and establishes a media stream transmission channel for the calling terminal device It is used for the media stream transmission of the session service with the called terminal device, and the calling terminal device and the called terminal device communicate with the session service through this channel.

In this embodiment, the OLT judges whether the calling terminal device and the called terminal device are terminal devices subordinate to the same OLT and establishes a service channel between terminal devices subordinate to the same OLT, so that no communication between terminal devices subordinate to the same OLT is realized. The function of conducting internal conversations through the control of the core network solves the defect that the core network needs to be controlled by the terminal equipment in the PON to conduct session services, resulting in excessive load on the core network.

Fig. 2 is a flow chart of Embodiment 2 of the session service control method of the passive optical network of the present invention. This embodiment can be performed before the above method Embodiment 1. As shown in Fig. 2, the method of this embodiment includes:

In step S201, the optical line terminal receives a registration request message sent by the terminal device.

Specifically, the core network can authorize the terminal device to perform relevant business communications only after the terminal device needs to be registered on the core network. When the terminal device is turned on, it needs to send a registration request message to the OLT first. All terminal devices subordinate to an OLT need to send a registration request message to the OLT when they are turned on.

In step S202, the optical line terminal sends a registration request message to the core network device.

Specifically, after receiving the registration request message sent by the terminal device, the OLT forwards it to the core network device. The core network device may be a related device used to complete a CSCF (Call Session Control Function, call session control function) or a softswitch function.

In step S203, the optical line terminal receives a registration success response message fed back by the core network device.

Specifically, after receiving the registration request message sent by the terminal device, the core network device registers the terminal device on the core network, and after successful registration, sends a registration success response message to the OLT.

In step S204, the optical line terminal stores address information corresponding to the terminal equipment identifier.

Specifically, after receiving the terminal device registration success response message sent by the core network device, the OLT notifies the terminal device of the registration success response message, and stores the relevant address information of the terminal device.

For example, an address information list may be stored in the OLT, and the OLT stores the address information corresponding to the successfully registered terminal device ID in the list, so that the OLT can subsequently store the address information corresponding to the called terminal ID in the list. address information list to determine whether the called terminal device and the calling terminal device belong to the same OLT.

Specifically, the address information of the terminal device may include: IP address and port number, SIP (Session Initiation Protocol, Session Initiation Protocol), URL and port number, and call number identifier.

In this embodiment, the address information of the terminal device is recorded inside the OLT during the core network registration process of the terminal device, so that when the terminal device performs session services, the OLT can directly establish a connection between the calling terminal device and the called terminal device according to the recorded address information. The communication channel solves the defect that the terminal equipment in the PON needs to be controlled by the core network for the session service.

FIG. 3 is a flow chart of Embodiment 3 of the session service control method of a passive optical network according to the present invention. This embodiment is a preferred embodiment of Embodiment 2 of the above-mentioned method. As shown in FIG. 3 , the method of this embodiment includes:

In step S301, the terminal device sends a registration request message to the optical line terminal.

Specifically, the terminal device may be a calling terminal device and a called terminal device, and the registration request message only completes the function of requesting registration, and does not include terminal authentication information.

Step S302, the optical line terminal forwards the registration request message to the core network device.

In step S303, the core network device sends a terminal authentication request message to the optical line terminal.

Specifically, after receiving the registration request message forwarded by the OLT, if the core network agrees with the terminal device to register, it sends a message to the OLT to request the terminal device to send authentication information.

Step S304, the optical line terminal forwards the terminal authentication request message to the terminal device.

Step S305, the terminal device sends a secondary registration request message with terminal authentication to the optical line terminal.

Specifically, after receiving the terminal authentication request message forwarded by the OLT, the terminal device confirms that the core network agrees with the registration request, and sends a secondary registration request message with authentication authorization to the OLT.

Step S306, the optical line terminal forwards the secondary registration request message with terminal authentication to the core network device.

Step S307, the core network device sends a registration success message to the optical line terminal.

Specifically, after the core network device receives the secondary registration request message with terminal authentication forwarded by the OLT, if it confirms that the authentication request message of the terminal device is a legal request, the terminal device passes the authentication, and records the corresponding information of the terminal device in the In the core network, the registration of the terminal device is completed, and a registration success message is sent to the OLT.

Step S308, the optical line terminal forwards the registration request message to the terminal device.

Specifically, after receiving the registration success message sent by the core network device, the OLT records the address information of the terminal device in the terminal device address information list in the OLT, and determines that the terminal device is a terminal device subordinate to the OLT. And forward the registration success message to the terminal device to complete the registration process.

FIG. 4 is a flow chart of Embodiment 4 of the session service control method for a passive optical network according to the present invention. As shown in FIG. 4 , the method of this embodiment includes:

In step S401, the optical line terminal receives a session call request including the identifier of the called terminal device sent by the calling terminal device.

In step S402, the optical line terminal determines whether the called terminal device is a terminal device subordinate to the optical line terminal according to the identifier of the called terminal device.

Step S403, if the called terminal device is not a terminal device subordinate to the optical line terminal, the optical line terminal sends a session call request to the core network device, so that the core network device can control the session between the calling terminal device and the called terminal device Perform call control.

Specifically, if the OLT judges that the called terminal device is not a terminal device subordinate to the OLT, the OLT forwards the session call request sent by the calling terminal device to the core network device, and the core network device passes the called terminal device carried in the session call request. The device identification is used for addressing, and after finding the called terminal device, a communication channel is established between the calling terminal device and the called terminal device.

In this embodiment, when the calling terminal device and the called terminal device are not the same terminal device subordinate to the OLT, the session request message of the calling terminal device is forwarded by the OLT, and the core network device sends the calling terminal device and the called terminal device session control.

FIG. 5 is a flow chart of Embodiment 5 of the session service control method of the passive optical network according to the present invention. As shown in FIG. 5 , the method of this embodiment includes:

Step S500, setting the session control mode of the optical line terminal.

Specifically, the session control mode is preset in the OLT according to the application scenario. The OLT provides three working modes for selection, which are: (1) close the OLT internal session control function; (2) open the OLT internal session control function, and give priority to the PON internal communication; (3) open the OLT internal session control function, and give priority to PON external communication. The internal session control function of the above-mentioned OLT is: the OLT directly controls the session service and establishes a communication channel for session communication between terminal devices without being controlled by the core network equipment, which is provided by the first embodiment of the method shown in FIG. 1 Technical solutions. The above mode (1) closes the OLT internal session control function. When the terminal equipment under the OLT performs session services, the OLT only forwards the message, and all the control processes are completed by the core network equipment. This mode is used when the core network needs to control the session of the terminal device, such as charging. The above mode (2) enables the OLT internal session control function, and gives priority to the PON internal communication. When the terminal equipment connected to the terminal equipment OLT performs session services, the OLT first judges the session call request sent by the calling equipment. If the called If the terminal device is a subordinate device of the OLT, the session service is controlled by the OLT without sending the information to the core network device. This mode is used when the terminal devices subordinate to an OLT are all the terminal devices of the same group user, and the core network allows internal conversations between the user's terminal devices. The above mode (3) enables the internal session control function of the OLT, and gives priority to the external communication of the PON. When the terminal equipment attached to the terminal equipment OLT performs session services, the OLT first judges whether the core network equipment fails. If there is no failure, the core network The network equipment performs session control, and the OLT only forwards messages. If the core network equipment fails, the session service is controlled by the OLT. This mode is used for session service backup for PON.

In step S501, the optical line terminal receives a session call request including the identifier of the called terminal device sent by the calling terminal device.

Step S502, judging the current session control mode of the OLT.

Specifically, after receiving the session call request sent by the calling terminal device, the OLT judges the session control mode currently set, and selects the subsequent steps to be performed according to the session control mode. If the session control mode is (1), execute step S503; if the session control mode is (2), execute step S504; if the session control mode is (3), execute step S508.

In step S503, the optical line terminal sends a session call request to the core network device, so that the core network device performs call control on the session between the calling terminal device and the called terminal device.

In step S504, the optical line terminal determines whether the called terminal device is a terminal device subordinate to the optical line terminal.

If the called terminal device is a terminal device subordinate to the optical line terminal, perform step S505; if the called terminal device is not a terminal device subordinate to the optical line terminal, perform step S503.

Step S505, the optical line terminal sends the session call request to the called terminal device.

Step S506, the optical line terminal receives the call response message fed back by the called terminal device.

In step S507, the optical line terminal establishes a media stream transmission channel between the calling terminal device and the called terminal device.

Step S508, judging whether the core network equipment fails.

Specifically, when the session control mode set in the OLT is (3), the OLT first judges whether the core network equipment on the upper layer fails, and if the core network equipment does not fail, execute step S503, and if the core network equipment fails, execute step S503. S509.

In a specific implementation, the method for the OLT to determine that the core network has failed may include: the OLT determines that the core network has failed by monitoring the communication status of the core network; Call response message to determine the failure of the core network.

Step S509, the optical line terminal determines whether the called terminal device is a terminal device subordinate to the optical line terminal.

Specifically, if the called terminal device is a terminal device subordinate to the optical line terminal, perform step S505; if the called terminal device is not a terminal device subordinate to the optical line terminal, perform step S510.

Step S510, sending a session failure message to the calling terminal device.

Specifically, if the called terminal equipment is not a terminal equipment subordinate to the optical line terminal, the internal session cannot be carried out, and since the core network also fails at this time, the calling terminal equipment cannot complete the session with the called terminal equipment, and the OLT A session failure message will be sent to the calling terminal device.

In this embodiment, by providing three session control modes of the OLT, different solutions are provided for the PON used in different scenarios, and a failure judgment mechanism and a backup mechanism of the core network are provided to realize business diversification of the PON network , improving the reliability of the session service.

Further, the OLT described in the above embodiments of the present invention may also include functions such as IP address translation for session services, NAT (Network Address Translation, network address translation)/firewall penetration, and the like.

In the OLT described in the embodiments of FIG. 1 to FIG. 5 of the present invention, the terminal equipment may include: an IAD built in or outside the ONU; or, an IP phone, a multimedia phone or a computer equipped with a software terminal under the ONU.

The conversational services described in the embodiments of Fig. 1 to Fig. 5 of the present invention may include: ordinary telephone service, multimedia telephone service and supplementary service, unified Centrex (Centralized Exchange, centralized subscriber exchange), multimedia ring tone, integrated one number communication, and multimedia conference , high-definition video conferencing, fax, messaging and other services.

The passive optical network PON involved in the embodiment of Fig. 1 to Fig. 5 of the present invention may include: GPON (Gigabit PON, gigabit passive optical network), EPON (Ethernet PON, passive optical network based on Ethernet), 10G PON ( 10 gigabit passive optical network), NGPON (Next Generation PON, next-generation passive optical network), WDM PON (Wavelength Division Multiplexing PON, wavelength division multiplexing passive optical network), etc.

FIG. 6 is a structural diagram of Embodiment 1 of the optical line terminal of the present invention. As shown in FIG. 6, the optical line terminal of this embodiment includes:

A receiving module 61, configured to receive a session call request sent by the calling terminal device and including the identifier of the called terminal device;

A determining module 62, configured to determine whether the called terminal device is a terminal device subordinate to the optical line terminal according to the called terminal device identifier;

The call processing module 63 is configured to send the session call request to the called terminal device if so;

The channel establishment module 64 is configured to receive a call response message fed back by the called terminal device, and establish a media stream transmission channel between the calling terminal device and the called terminal device.

The optical line terminal of this embodiment can be used to implement the technical solution of the first embodiment of the session service control method for the passive optical network shown in FIG.

Fig. 7 is a structural diagram of Embodiment 2 of the optical line terminal of the present invention. As shown in Fig. 7, the optical line terminal of this embodiment further includes:

The registration agent module 71 is used to receive the registration request message sent by the terminal device; send the registration request message to the core network device; receive the registration success response message fed back by the core network device; store the address information corresponding to the terminal device identifier;

The determining module 62 is specifically configured to determine whether the called terminal device is a terminal device subordinate to the optical line terminal according to the identifier of the called terminal device and the stored address information.

The optical line terminal of this embodiment can be used to implement the technical solution of the second embodiment of the session service control method of the passive optical network shown in FIG.

The structure schematic diagram of the third embodiment of the optical line terminal of the present invention can be referred to as shown in FIG. The device sends the session call request to the core network device, so that the core network device performs call control on the session between the calling terminal device and the called terminal device.

The optical line terminal of this embodiment can be used to implement the technical solution of the fourth embodiment of the session service control method of the passive optical network shown in FIG.

Fig. 8 is a structural diagram of Embodiment 4 of the optical line terminal of the present invention. As shown in Fig. 8, the optical line terminal of this embodiment further includes:

The function enable module 81 is used to determine whether the called terminal equipment is a terminal equipment subordinate to the optical line terminal, determine that the core network fails, and enable the internal session control function of the optical line terminal.

The function opening module 81 is specifically used to determine that the core network fails by monitoring the communication status of the core network; or, determine that the core network fails by not receiving a session call response message fed back by the core network device within a preset time.

The optical line terminal of this embodiment can be used to implement the technical solution of the fifth embodiment of the session service control method of the passive optical network shown in FIG. 5 , and its implementation principle and technical effect are similar, and will not be repeated here.

In the OLT described in the embodiments of FIGS. 6 to 8 of the present invention, the terminal equipment may include: an IAD built into or external to the ONU; or an IP phone, a multimedia phone or a computer equipped with a software terminal under the ONU.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (6)

1. A session service control method of a passive optical network, characterized in that, comprising: The optical line terminal receives the session call request including the identifier of the called terminal device sent by the calling terminal device; The optical line terminal determines whether the called terminal device is a terminal device subordinate to the optical line terminal according to the called terminal device identifier; If yes, the optical line terminal sends the session call request to the called terminal device; receiving, by the optical line terminal, a call response message fed back by the called terminal device; The optical line terminal establishes a media stream transmission channel between the calling terminal device and the called terminal device; If the called terminal device is not a terminal device subordinate to the optical line terminal, the method further includes: The optical line terminal sends the session call request to a core network device, so that the core network device performs call control on the session between the calling terminal device and the called terminal device; Before the optical line terminal receives the session call request sent by the calling terminal device and includes the identifier of the called terminal device, it further includes: The optical line terminal receives the registration request message sent by the terminal device; The optical line terminal sends the registration request message to a core network device; The optical line terminal receives a registration success response message fed back by the core network device; The optical line terminal stores address information corresponding to the terminal equipment identifier; The determining whether the called terminal equipment is a terminal equipment subordinate to the optical line terminal includes: According to the identifier of the called terminal device and the stored address information, it is determined whether the called terminal device is a terminal device subordinate to the optical line terminal. 2. The method according to claim 1, wherein before determining whether the called terminal device is a terminal device subordinate to the optical line terminal, further comprising: The optical line terminal determines that the core network fails, and enables the internal session control function of the optical line terminal. 3. The method according to claim 2, wherein the optical line terminal determines that the core network fails, comprising: The optical line terminal determines that the core network fails by monitoring the communication state of the core network; or, The optical line terminal determines that the core network fails by not receiving the session call response message fed back by the core network device within a preset time. 4. An optical line terminal, characterized in that it comprises: A receiving module, configured to receive a session call request sent by the calling terminal device and including the identifier of the called terminal device; A determining module, configured to determine whether the called terminal device is a terminal device subordinate to the optical line terminal according to the called terminal device identifier; A call processing module, configured to send the session call request to the called terminal device if so; The call processing module is further configured to send the session call request to a core network device if the called terminal device is not a terminal device subordinate to the optical line terminal, so that the core network device can control the session between the calling terminal device and the called terminal device; A channel establishment module, configured to receive a call response message fed back by the called terminal device, and establish a media stream transmission channel between the calling terminal device and the called terminal device; a registration proxy module, configured to receive the call response message sent by the terminal device A registration request message; sending the registration request message to a core network device; receiving a registration success response message fed back by the core network device; storing address information corresponding to the terminal device identifier; The determining module is specifically configured to determine whether the called terminal device is a terminal device subordinate to the optical line terminal according to the called terminal device identifier and stored address information. 5. The optical line terminal according to claim 4, further comprising: A function enabling module, configured to determine whether the called terminal equipment is a terminal equipment subordinate to the optical line terminal, determine that a failure occurs in the core network, and enable the internal session control function of the optical line terminal. 6. The optical line terminal according to claim 5, wherein the function enabling module is specifically configured to determine that a failure occurs in the core network by monitoring the communication state of the core network; After receiving the session call response message fed back by the core network device, it is determined that the core network fails.