CN101110737A - Method and device for implementing voice intercommunication in kilomega bit Ethernet passive optical network - Google Patents

Abstract

The present invention provides a method and a device for realizing the sound intercommunication in the G-bit Ethernet passive optical network. A VOIP disc realizing the media agent function is added in an office end to realize the sound intercommunication among the OLT interior users. The VOIP disc of the present invention replaces a media agent platform, and the present invention has the advantages that the development period is short and the cost is low.

Description

Realize the method and apparatus of voice intercommunication in the Gigabit Ethernet EPON

Technical field

The invention belongs to fiber optic communication field, relate in particular to a kind of method and apparatus of in based on EPON (EPON) system of gigabit Ethernet, realizing voice intercommunication.

Background technology

The typical EPON of one cover system is made up of optical line terminal (OLT), passive optical splitter/coupler (ODN) and optical network unit (ONU), adopts tree topology, as shown in Figure 1.EPON uses wavelength division multiplexing (WDM) technology, handles the two-way signaling transmission simultaneously, and the uplink and downlink signal is used different wavelength respectively.OLT (OpticalLine Terminal) is placed on central office side CO, can be a L2 switch or L3 router.Being connected of its distribution and control channel, and real-time monitoring, management and maintenance function are arranged.ONU is placed on user side.General ONU down direction connects Integrated Access Device, and the mode of hanging IAD equipment at present among the EPON under the ONU has two kinds: the one, and the built-in IAD plate of ONU; The one, the plug-in IAD plate of ONU.IAD converts voice analog signal to IP bag, transmits or the voice IP that transmits among the EPON wrapped with the form of IP bag to be reduced into analog signal and to be sent to subscriber phone in PON, finally realizes the speech business among the EPON.H.248 IAD can adopt, MGCP, SIP and H.323 agreement realize the IP speech.

EPON (EPON) based on Ethernet is the optical access network of a point to multiple spot, has very high cost performance, can provide reliable data, speech and video traffic for the terminal use, and can provide upstream and downstream bandwidth up to 1Gbit/s, this bandwidth can adapt to now and in 10 years in the future the user to the demand of bandwidth.EPON adopts multiplex technique, supports more user, and each user can enjoy bigger bandwidth.Because data service is isolated mutually between the requirement EPON of the telecom operators internal system different user, the user that is more convenient for like this administers and maintains; User under the same OLT is because the point of PON has determined the direct point-to-point data of user to isolate mutually to multipoint configuration, and all EPON ONU hang the directly intercommunication of IAD equipment voice flow down.So need external media server or on three layer protocols, realize the voice flow intercommunication.But under different PON, just can there be such problem.

Generally speaking, under the same OLT between the user voice isolate mutually.The present invention's problem of two layers of isolation that solve voice.

EPON can realize the optical fiber topological structure of point-to-multipoint, and when the user is connected to specific distribution optical fibers, their share optical fiber distribution network, and (OpticalDistributionNetwork ODN), gets back to the telecommunications room local side by key optical fiber.EPON can realize that not only the transmission of data can also realize the transmission of voice and image.Based on relatively more popular at present in the voice implementation of the packet network of IP/ATM be exactly the VOIP technology.The maximum now advantage of VOIP is exactly to adopt the environment of INTERNET and global ip interconnection widely.Provide than traditional business and more many better service.No matter voice realize that with which kind of agreement they all have a common ground in EPON: call out control and separate with carrying control.Call control packet is drawn together the processing with various call flows of tearing down and building of call link.The MGC platform only is responsible for the processing of call control signalling, and the just foundation and the transmission of the path of voice flow are controlled in not responsible carrying.So only need set up control channel transmits the control signaling specially between user and the MGC platform.According to international standard protocol, after call link was set up successfully, both sides obtained the other side contact address and transmit port from call control signalling.Voice flow is directly set up the voice flow passage according to the other side's address and port and is carried out point-to-point transmission, and it needn't pass through MGC platform or other third party.With the MGCP agreement is example, as shown in Figure 2; If above voice flow is realized in EPON, will analyze according to concrete environment.Introduction by the front can know, if the user under different OLT, voice packet is packaged into IP and wraps in and directly be sent to the other side on the IP network, realizes phonetic function.Answer telecom operators' requirement data in same OLT to isolate mutually, nature can't point-to-pointly transmit, and voice flow also is like this.

For solving the problem that voice are isolated under the OLT, general method is that the third party who creates conversation carries out the forwarding of voice flow, and we are referred to as Media proxy.Media proxy often is attached on the MGC platform.Voice flow is not directly to be sent to the other side but to be responsible for forwarding by Media proxy.This method can solve the problem that voice packet transmits under the same OLT.Voice flow is at first delivered to Media proxy, and Media proxy is determined the destination address of voice packet according to the bag of receiving, and transmits, as shown in Figure 3;

Based on the consideration of cost and utilization rate, the shared Media proxy of often several local sides meetings can solve the problem of two layers of isolation so technically, and up-front investment is little.But this also cause circumstance complication and corresponding be so that the technical realization difficulty of a plurality of local sides is big, the construction cycle is long, the cost height.Under such environment, the phone in PON, voice flow have not just gone out local side usually and have turned around but can go out a city and transmit again, be equivalent to beat one long-distance.IP network is again towards connectionless, does not bear the necessarily success of forwarding of bag, and voice quality and coefficient of safety can not get guaranteeing certainly.When traffic carrying capacity peaks, voice flow will certainly take a large amount of first line of a couplet bandwidth resources because it has limit priority and requires little time-delay and shake, the packet loss of data service inevitably increases so, even probably causes the paralysis of backbone network.For fear of the generation of this situation, Media proxy is transferred to each local side good way of also can yet be regarded as.But at first on cost, operator just can not accept.Secondly Media proxy is transferred to the place, does not also calculate on the utilization rate, and for a fraction of inner speech business increases an agency, resource is relatively wasted.The contradiction that how to solve the two is exactly starting point of the present invention.The present invention will solve the problem of Media proxy in the PON internal system, promptly increase the function of Media proxy on OLT, the speech business of intercommunication can not flowed OLT equipment upper united mouth in the PON, directly by the Media proxy function loopback on the OLT, thereby need not increase network traffics, take Internet resources.

Summary of the invention

The object of the invention is to provide the method and apparatus of realizing voice intercommunication in a kind of Gigabit Ethernet EPON.

It is characterized in that: the VOIP dish that can realize the Media proxy function one of the inner increase of a local side; The optical line terminal OLT internal user regularly to the registration of VOIP dish, is informed address and port number information, and the VOIP dish is safeguarded an OLT internal user address table, is used for judging whether voice flow needs the OLT inloop; When user in the OLT initiates audio call by integrated access equipment IAD, at first destination address and port numbers to be reported to the VOIP dish; VOIP dish in search purposes address in the oneself address table whether with source address in same OLT, if words then respond OK, set up an OLT inner gateway and arrive purpose side; The VOIP packing is also removed the opposing party's passage in the voice pathway of removing a side according to the message of the port information of the link that requires to remove.

Realize the device of voice intercommunication in a kind of Gigabit Ethernet EPON provided by the invention, it is characterized in that: this device is installed in a local side inside, this device comprises: maintenance module, be used for regularly safeguarding an OLT internal user address table when the VOIP dish is registered and informed address and port number information when the OLT internal user, it is used for judging whether voice flow needs the OLT inloop; Enquiry module, whether be used for when user in the OLT initiates audio call by integrated access equipment IAD and destination address and port numbers reported to the VOIP dish in search purposes address in the above-mentioned address table with source address in same OLT, if words then respond OK, set up an OLT inner gateway to purpose side; Remove module, the port information that is used for the link removed according to customer requirements is also removed the opposing party's passage in the voice pathway of removing a side.

Description of drawings

Fig. 1 represents the schematic diagram of existing EPON structure;

Fig. 2 represents the existing schematic diagram of setting up link with the MGCP agreement;

Fig. 3 represents the forwarding schematic diagram of existing Media proxy;

Fig. 4 represents that proprietary protocol according to the present invention sets up the flow chart of link;

Fig. 5 represents that proprietary protocol according to the present invention removes the schematic diagram of link;

The schematic diagram of message structure when Fig. 6 represents the IAD registration;

The schematic diagram of the message structure that Fig. 7 sends when representing to apply for setting up the rtp streaming form;

The schematic diagram of the message structure that Fig. 8 sends when representing to apply for discharging the rtp streaming form;

Fig. 9 represents the schematic diagram according to device A N5116-02 of the present invention.

Embodiment

The invention will be further described below in conjunction with accompanying drawing.

The technical scheme that technical solution problem of the present invention is adopted is:

Use for reference the thinking of Media proxy, increase by one and can realize that Media proxy function ply-yarn drill can not solve the problem of voice flow intercommunication under the situation of equipment upper united mouth in that a local side is inner.Its major function is exactly to realize the voice intercommunication of OLT internal user.Because environment is simple, its function ratio is more single, and technical realization is easy.The cycle that replaces a Media proxy platform not only to develop with functional disc is short but also cost is low.We claim that this piece Media proxy dish is the VOIP dish.On hardware, according to different environment can design media agency's the number of use passage to avoid the waste of resource.With AN5116_02 is example, is changed to 2048 users according to the full configuration of an EPON system and calculates, and requiring its redundancy is 1: 8.Media proxy should support 12.5% user of an EPON system to make a call user's in the OLT simultaneously so.It is 256 the tunnel just can satisfy the demand of operator that design media agency's maximum is used passage.Technically, the present invention increases the function that several simple proprietary protocols are finished Media proxy under the prerequisite of not revising the normal voice agreement, as shown in Figure 4, specific as follows:

1 sets up address table: the OLT internal user regularly to the registration of VOIP dish, is informed address and port number information, and the VOIP dish is safeguarded an OLT internal user address table, is used for judging whether voice flow needs the OLT inloop;

The foundation of 2 links (EST_REQ): for the forwarding passage set up in voice in EPON.Normal voice link is set up in the flow process, and user IAD is directly to the media gateway controller MGC request of making a call of OLT outside.But in this programme, user IAD initiates audio call in the OLT, at first destination address and port numbers will be reported to the VOIP dish.VOIP dish in search purposes address in the oneself address table whether with source address in same OLT, if words then respond OK, set up an OLT inner gateway and arrive purpose side.If not words refused, the user can directly carry out normal flow process, the direct point-to-point transmission of voice flow is just transmitted without the third party.

The dismounting of 3 links, as shown in Figure 5: behind the talk-through, remove this link by the side application of conversation.In this programme, if remove talking link in the same OLT, the user except to remove and MGC between link, also to remove and the VOIP dish between link.Be to consider the opposing party of conversing when the user removes link, so the user is as long as provide the port information of the link that own institute requires dismounting just passable to VOIP.The port information of the link that the VOIP dish can be removed is as requested also removed the opposing party's passage when a side tears chain open.The user remove and VOIP between voice pathway after remove again and MGC between calling control link.

Owing to when device interior is set up voice channel, only need the user that the most basic requirement the other side's IP and the agency that port numbers just can realize medium are provided, no matter and this condition all is that requirement provides when which kind of voice protocol is set up link.So above scheme all is suitable in four kinds of voice protocols.Because we narrow down to a local side apparatus inside to the scope of Media proxy, act on behalf of simple that desired function also will be relative so will realize voice, it is technical that to implement the cycle short, research and development easily, cost is low.Top technical scheme has also embodied this point.And because be the function that realizes Media proxy in the inside of equipment, so to the control of the priority of speech business and bandwidth also relative want simple.Voice quality and safety nature are with regard to relatively good assurance.

Above technical scheme introduced three main steps: registration, link setup and tear chain open.Here introduce in detail.

As shown in Figure 6, the schematic diagram of its expression IAD registration message structure, IAD regularly registers: can be regularly to the registration of VOIP dish behind the IAD device start.

This bag shown in Figure 6 is the packet format that IAD regularly registers to the VOIP dish.Wherein the IP address is the IP of IAD oneself.Refer to the physical location at IAD place OLT number, port number refers to the voice port number of IAD, and ONU refers to the grant number of system to ONU.Initial entity number is the identification point for a plurality of telephony ports of IAD, often since 0 or 1 numeration.

As shown in Figure 7, the schematic diagram of the message structure of rtp streaming form is set up in its expression application, rtp streaming is set up in application, is not here to set up the path of control signaling with the MGC platform but the link of rtp streaming is set up in application, so it is just passable only need to contain basic information in the protocol information that we require.Form is as follows, and the 0th to the 6th byte can process according to specific circumstances in the bag, if having these information in the control signaling in the agreement, can do detailed processing to voice signal according to user's needs.If there is not the information of the first seven byte also can not influence basic conversation, the VOIP dish can be the medium agency to current conversation equally.Wherein:

The rtp streaming mode-definition is as follows:

0 expression sends and receives;

1 expression stops;

2 expressions only send;

3 expressions only receive;

4 expressions send and receive;

5 expression loopbacks;

Voice coding modes is defined as follows:

0 expression G711.A coded system;

1 expression G711.U coded system;

2 expression G723.1 coded systems;

3 expression G726_32 coded systems;

4 expression G729A coded systems;

5 expression T38 FAX coded systems;

Gain ranging is 0～65535db:

Jitter range is 0～65535ms:

The silence compression mode-definition is: 0x00 represents that this pattern closes; 0x01 represents that this pattern opens comfortable background noise mode-definition and be: 0x00 represents that this pattern closes; 0x01 represents that this pattern opens;

As shown in Figure 8, its expression application discharges the schematic diagram of the message structure of rtp streaming form, discharges rtp streaming to the VOIP application after user's on-hook, removes the RTP link.

EPON (EPON) based on gigabit Ethernet combines Ethernet with the advantage of PON, realized low-cost, access at a high speed at a distance, is considered to the new trend of broadband access at present.Though two layers of still inner identical also quilt of voice of the problems of isolating to have solved broadcast storm are isolated independent can not the conversation normally among the EPON.Though the attached Media proxy of MGC platform can address this problem now, can't guarantee the quality of voice owing to the complexity of environment.The present invention proposes to realize the Media proxy function by proprietary protocol in the EPON internal system, user's communication is directly by internal system Media proxy loopback in the PON, make the interior rtp streaming of PON not need system, just can realize intercommunication, can not cause voice quality poor because of problem of environment.The proprietary protocol that the present invention proposes is several simple proprietary protocols that increase under the flow process of not revising normal VOIP voice protocol, so also can not influence the normally associate of the user between various VOIP voice users and other platforms.The common ground of various VOIP voice protocols is that carrying is independent mutually with control.Voice flow all is point-to-point direct transmission RTP bag though the control signaling has nothing in common with each other.It doesn't matter for the problem of two layers of isolation of the inner solution of EPON and control signaling among the present invention, only relevant with the forwarding of RTP bag, so this scheme can be supported the operation of agreement while in EPON of various VOIP.Therefore EPON device interior can connect the VOIP voice user of different agreement.Fig. 9 is the concrete picture group according to EPON device A N5116_02 of the present invention.By finding among the figure that it is very effective for the isolating problem that solves various voice protocols in the OLT that the present invention proposes in the inner scheme that increases a VOIP dish operation proprietary protocol of EPON.

Claims (6)

1. realize the method for voice intercommunication in the Gigabit Ethernet EPON, it is characterized in that: increase the VOIP dish that to realize the Media proxy function in that a local side is inner;

The optical line terminal OLT internal user regularly to the registration of VOIP dish, is informed address and port number information, and the VOIP dish is safeguarded an OLT internal user address table, is used for judging whether voice flow needs the OLT inloop; When user in the OLT initiates audio call by integrated access equipment IAD, at first destination address and port numbers to be reported to the VOIP dish;

VOIP dish in search purposes address in the oneself address table whether with source address in same OLT, if words then respond OK, set up an OLT inner gateway and arrive purpose side;

The VOIP packing is also removed the opposing party's passage according to the message that requires to remove link in the voice pathway of removing a side.

2. method according to claim 1 is characterized in that: when search purposes address and source address be not in same OLT in the VOIP dish address table at oneself, the user by IAD directly to the media gateway controller MGC request of making a call of OLT outside.

3. method according to claim 1 and 2 is characterized in that:

When the user remove and VOIP between voice pathway after remove again and MGC between calling control link.

4. realize the device of voice intercommunication in the Gigabit Ethernet EPON, it is characterized in that: this device is installed in a local side inside, and this device comprises:

Maintenance module is used for regularly safeguarding an OLT internal user address table when the VOIP dish is registered and informed address and port number information when the OLT internal user it is used for judging whether voice flow needs the OLT inloop; Enquiry module, whether be used for when user in the OLT initiates audio call by integrated access equipment IAD and destination address and port numbers reported to the VOIP dish in search purposes address in the above-mentioned address table with source address in same OLT, if words then respond OK, set up an OLT inner gateway to purpose side;

Remove module, the port information that is used for the link removed according to customer requirements is also removed the opposing party's passage in the voice pathway of removing a side.

5. device according to claim 4 is characterized in that:

When enquiry module when search purposes address and source address in the address table are not in same OLT, the user by IAD directly to the media gateway controller MGC request of making a call of OLT outside.

6. according to claim 4 or 5 described devices, it is characterized in that:

When the user remove and this device between voice pathway after remove again and MGC between calling control link.

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