CN102064959B - Three-network convergence oriented digital home network architecture - Google Patents
Three-network convergence oriented digital home network architecture Download PDFInfo
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Abstract
The invention discloses a three-network convergence oriented digital home network architecture. In the architecture, the network is partitioned into different application domains according to the digital home service requirements, information terminal devices with similar home services and similar function requirements are connected in the same application domain, and all terminal devices in the domain and services provided by the all terminal devices are managed by an application domain management center, thereby lightening the burden of a home gateway in managing specific services, and simultaneously being favorable for effective unified management of resources in the application domains. The digital home network architecture is composed of information terminal devices and intelligent home appliances, a network connection device, a digital home application domain management center and a home gateway. Based on the network architecture, the invention provides an addressing scheme and a communication method for a three-network convergence based digital home network architecture layering device, and realizes interconnection and intercommunication among digital home devices.
Description
Technical field
The invention belongs to network communication field, relate to network resource management and network organizing technology, refer to especially the digital family network system under telecommunications network, cable television network, the Internet integration of three networks background.
Background technology
The develop rapidly of digital technology is constantly expediting the emergence of numerous digital products, the digital products such as PC, PDA, mobile phone, Digital Television, DVD, MP3, DV/DC progressively enter in common life, meanwhile, the development through the several years as three large present information transmission meanss of telecommunications network, cable television network, the Internet, on three information platforms, set up the huge separately network system respectively, the digital home that develops into of the integration of three networks provides more diversified service and more superior resource platform.Therefore, building one supports three net accesses, interconnected, the shared home network demand of content also increasingly to highlight.
The communication existing for digital home and deposit, the problem of difficult communication between internal unit and between inner and outside heterogeneous network, design and the digital home network structure that builds the multiple heterogeneous network of fusion are the bases of carrying out digital home's construction.
At present according to the difference of service application management mode in digital home, digital home network structure mainly can be divided into discrete type and centralized two types.The business that discrete type is responsible for it to provide by terminal self manages.For multiple heterogeneous network the situation of depositing, terminal need to provide multiple communication module to realize the support to different communication technology.Centralized network structure be take home gateway as core, by home gateway, to home network, provides abundant downlink and uplink interfaces, supports communication (wired and wireless).The effect of " communication middleware " of centralized network structure by gateway, realize between household internal heterogeneous network and inner and outside various heterogeneous networks between communicate by letter.
Discrete type network configuration implements more convenient, adds according to demand corresponding communication module can realize and from Inside and outside network, obtain more resources by each manufacturer terminal on equipment.As a kind of transition structure, by terminal equipment producers such as most of household electrical appliances and digital products, adopted at present.But present communication mode is varied, cannot support all communication interfaces, and in the selection of communication interface, the communication technology that each terminal producer is selected is also not quite similar, for the fusion between heterogeneous network in home network, also brought certain difficulty like this; This structure is also unfavorable for that the unification of terminal resource manages effectively.The management of terminal is completed by self, has additionally increased terminal and user's burden.
Centralized network structure, by introducing home gateway, can merge and various terminals are managed concentratedly the multiple communication technology of household internal, is convenient to the shared and application of information between the inner various terminals of digital home.Simultaneously gateway is as the connection of household internal network and external network, can and prevent that to the security maintenance of digital household internal network service the attack of external network (being mainly Internet at present) from playing crucial effect.Patent " digital family network system " (application number is 02126052.4) and the disclosed digital family network system of " a kind of home gateway of application domain digital family system " (application number is 200610170413.X) have all adopted this centralized network structure.But of a great variety owing to applying in digital home network, the communication technology variation adopting, business for different application kind need be carried out different administrative mechanisms and method, for different communication technology, also need to build the fusion that a general communications platform can be realized network, guarantee interconnecting of equipment.Except needs normal transmission, safety is also that this platform need to be considered, the different communication technologys, and its security mechanism is also not quite similar, and the safe fusion problem in heterogeneous network also can be brought great burden to home gateway.Home gateway complex structure under this structure, and the network integration of bearing of gateway and the burden of service management will be very heavy, be unfavorable for the use of user to digital home business.
Under the background of the integration of three networks at present, digital home will introduce more service application, and how effectively work organization inside and outside digital home to be got up with management is the key point of digital home's networking.
Summary of the invention
The technical problem to be solved in the present invention be for the multiple network existing in discrete type and centralized network structure and deposit, devices communicating difficulty and class of business is various, managerial structure complicated situation, a kind of new network system of improved digital home network structure has been proposed, according to the demand of digital home's business, discrete type is combined with centralized management mode, more original digital home network structures are improved, and having proposed can provide for user the digital home network structure of unified business service under integration of three networks background.In order to reach above object, the present invention is achieved in that
The scheme of technical solution problem of the present invention is, according to the business demand of digital home, network is divided into different application domains, business in digital home is similar, the information terminal apparatus that functional requirement is close is connected in same application domain, the digital family network system building on the basis of division application domain is by information terminal apparatus, network access device, four kinds of network entities of application domain administrative center and home gateway form, described information terminal apparatus refers to the network entity of carrying out concrete digital home business function, its corresponding concrete equipment is as the mobile phone of family's communication domain, IP phone, the TV in audio-visual amusement territory, DVD, described network access device refers to realizes the network entity that each terminal room of Access Network interconnects, and comprises wireless, super joint, borde gateway, the functional entity that information terminal apparatus in same application domain in home network and the business service that provides thereof are managed is provided in described application domain administrative center, described home gateway is the core of digital home network, the digital home network management platform of setting up with home gateway center, and the responsible business that external network is provided and each application domain of internal network are effectively managed concentratedly.
The present invention has designed the communication plan between equipment in digital home according to network configuration feature, in digital home, the communication of equipment room has been carried out corresponding improvement to the hierarchical mode of TCP/IP in computer network, can meet digital home network and merge multiple communication technology demand.This scheme is separated equipment addressing and the service application on concrete physical communication technology and upper strata, thus realize between the inner distinct device of digital home network and and external network between interconnect, concrete communication process is as follows:
In application domain, between same communication mechanism equipment, can directly communicate;
Communication in application domain between different communication mechanism equipment: first communication source equipment send message to application domain borde gateway, the protocol conversion function by application domain borde gateway will send to target device after message restructuring again, thereby realize whole communication process;
The communication of equipment between different application territory: communication source equipment sends message to application domain borde gateway, it is non-this territory equipment that borde gateway detects target device, then message is transmitted to the borde gateway in territory, target device place, if gateway communication mode is identical with target device, directly send to target device; If communication mode is different, need to carry out protocol conversion, message restructuring is finally sent to target device, complete whole communication process;
Digital home inner with equipment in outside heterogeneous network between communicate by letter: communication source equipment is first to home gateway transmission message, home gateway, according to the difference of user's request service belonging network, carries out user's message by corresponding network interface, to send to the equipment in objective network again after corresponding protocol conversion and message restructuring.
On the basis of digital family network system, adopt the mode of layering addressing to carry out digital family network appliance addressing, according to the difference of home network device level of living in, home network device is divided into home gateway layer, application domain management level and three levels of terminating layer, make client can access multiple different heterogeneous network, realize the intercommunication mutually between equipment in digital home network.
Compare with above-mentioned background technology, the new digital home network framework of design has following characteristics:
Application domain subnet division: divide according to different application domains, the equipment with function and usage of the same race is divided in a territory as far as possible, be so both convenient to resources centralized management, can reduce again the cross-domain communication demand of terminal equipment between different application territory as far as possible.By application domain administrative center is set, is conducive to the shared and audit (as the statistics of this domain information, information accuracy and safety evaluation etc.) of the resource of various different terminals in this application domain, thereby can utilizes more effectively, safely various resources.And this management mode can also reduce the burden of home gateway centralized management digital home business effectively.
Digital home network management platform: by build digital home network management platform in home gateway, each application domain of the business that can effectively provide external network and internal network is effectively managed concentratedly.
Towards three nets, unifying business provides: by home gateway, shield the bottom communication difference of outside various heterogeneous networks, and for user provides unified service access interface, thereby met the application demand that current user uses service that multiple network provides.
The present invention is not changing under the prerequisite of home services terminal equipment, from service, resource management and offered load optimization aspect, to digital home network architecture, carried out perfect, not only realized interconnecting of digital family equipment, and realized the centralized management of user to service, resource, reduce user's use burden and system maintenance expense, by application domain administrative center is set, avoided the inhomogeneous of system loading simultaneously as far as possible.
Accompanying drawing explanation
Fig. 1 is digital home network structure diagram of the present invention;
Fig. 2 is digital home network entity Organization Chart of the present invention;
Fig. 3 is addressing mode flow chart of the present invention;
Fig. 4 is improvement digital home network traffic model figure of the present invention;
Fig. 5 is the traffic diagram between digital home network inside terminals IP device of the present invention;
Fig. 6 is the schematic diagram of the communication process (comprising non-IP device) of digital home network inside terminals of the present invention;
Fig. 7 is the present invention's one instantiation application schematic diagram.
Embodiment
The present invention is on the basis of existing digital home network structure, in conjunction with technology such as network configuration design, network resource management, network addressing and network services, by dividing application domain, make the various equipment with similar purposes in whole digital home be organically combined into as a whole, be convenient to user and manage, can meet flexibility, adaptivity and the extendibility requirement of system simultaneously.The digital home network framework model of design as shown in Figure 1.Referring to accompanying drawing, the present invention is described in further detail.
1. the digital family network system based on the integration of three networks
The structure of whole digital home network comprises the content of two aspects: the first, divide " application domain ".Application domain is the basis of network of founding a family, and various different terminal equipments are organically combined into the integral body with correlation by application domain.The introducing of " application domain " will greatly reduce the burden of the service management aspect of digital home gateway, also greatly facilitates user and various differences is provided to the management of the equipment of service simultaneously.The second, centered by home gateway, in conjunction with application domain administrative center, build Yi Ge digital home management platform, by this platform user, can realize effective unified management of each application domain in family.Simultaneously, for digital home's external network, there is multiple heterogeneous network, be communication network, television network broadcast and computer network three nets the present situation of depositing, the service that this platform provides these networks is all returned and is unified to provide for digital home's internal user for external web services, and constructed network architecture diagram as shown in Figure 2.
This digital home network framework has comprised following components: information terminal apparatus and intelligent appliance, network access device, digital home application domain administrative center and home gateway.
Information terminal apparatus and intelligent appliance: carry out the network entity of concrete digital home business function, its corresponding concrete equipment is as the mobile phone of family's communication domain, IP phone, the TV in audio-visual amusement territory, DVD etc.
Network access device: realize the network entity interconnecting between each terminal equipment, this has comprised wireless, super joint, border communication gate etc.Its corresponding concrete equipment is as WLAN, 3G access point, switch, router, Modem and the universal gateway equipment etc. of supporting plurality of access modes.Borde gateway is deployed with the modified model ICP/IP protocol stack with universal chain circuit control layer GLC, includes physical layer (PHY), media Access Layer (MAC), universal chain circuit control layer (GLC), network layer (IP), transport layer (TCP) and application layer.Wherein, physical layer (PHY) support has multiple different physical communication interface, and media Access Layer (MAC) is supported multiple different media access protocol.
Digital home application domain administrative center: the terminal equipment in same application domain in home network and the business service that provides thereof are managed.Central management system can be integrated on borde gateway equipment and realize, and also independently application domain center management server can be set separately.
Home gateway: the core of digital home's internal network is also the crucial entity that internal user is provided by the various services that provide in outside heterogeneous network simultaneously.Digital home's management platform with home gateway center has comprised BSM and safety management two large divisions, BSM system is mainly that unified management is carried out in all services that each application domain of digital household internal and outside heterogeneous network are provided, for user provides various service api interfaces, by these interfaces can conveniently realize the various different services in digital home inside and outside registrations, the basic function such as inquire about, obtain.Safety management system adopts the security mechanisms such as authentication, access control and data encryption of realization to resist from family's network internal and outside various security threats, as disabled user's access, privacy information are stolen etc.
2. the addressing mode of the digital family network system based on the integration of three networks
The object of the invention is to make client can access multiple different heterogeneous network, realize the intercommunication mutually between equipment in digital home network, therefore not only need traditional internet access facility, communication equipment allocate communications address, various home appliances will join in network also to be needed correspondingly to address.The network equipment is most popular is at present based on TCP/IP protocol suite, but many home appliances all belong to the equipment that is operated in non-IP territory.
On the basis of invented digital home network framework, adopt the mode of " layering addressing, differentiated control " to meet digital family network appliance addressing demand." layering addressing, differentiated control " to the effect that: according to the difference of home network device level of living in, household equipment is divided into home gateway layer, application domain management level and three levels of terminating layer, addressing mode at all levels is as described below.
At home gateway layer, adopt IPv4 or IPv6 agreement to address.If adopt IPv4 addressing mode, because number of addresses is limited, digital home will externally present unified IP address, i.e. the IP address of gateway.This address is the address of the gateway distribution of the upper level in external network.If adopt IPv6 form of presentation, inner each IP device of digital home will be assigned with an independently IPv6 address, and different IP devices externally presents different addresses.
In application domain management level, application domain administrative center equipment, also based on ICP/IP protocol stack, can adopt IPv4 or IPv6 agreement to address.When adopting IPv4 addressing mode, the address of application domain administrative center equipment is by home gateway unified distribution, inquiry and renewal.The concrete method of salary distribution adopts NAT technology, and in family, gateway is safeguarded address list, sets up the address mapping to different application territory administrative center.When adopting IPv6 addressing mode, application domain administrative center equipment has independently address.This address, by external network unified distribution, renewal and inquiry, need not participate in corresponding address administration process by home gateway.
At device end layer, by application domain administrative center equipment, be responsible for all devices in its territory (comprising IP device and non-IP device) to carry out address administration, wherein for IP device, adopt conventional IPv4 or IPv6 addressing way to manage; For non-IP device, according to the requirement of different vendor, different communication mode, need to arrive application domain administrative center and register its device identification (as MAC etc.).Application domain administrative center safeguards corresponding address list simultaneously, sets up application domain administrative center to the address mapping of non-IP device.When needs are updated the equipment address, also need to notify application domain administrative center, its address to non-IP device is upgraded, so that when communicating, can be properly routed to correct home appliance.
As shown in Figure 3, digital home network IP device can adopt IPv4 or IPv6 addressing mode.
If the inner IP device of digital home adopts IPv4 addressing mode, concrete addressing flow process is as follows:
(1) home gateway is connected into home network, by the external network gateway of upper level, it is carried out to address assignment, renewal.What now, family externally manifested is the address of home gateway.
(2), when application domain administrative center access network, by home gateway, to it, distribute corresponding address and be responsible for inquiry and the renewal of address.
(3), during the IP device access network in application domain, by application domain administrative center, to it, distribute corresponding address and be responsible for inquiry and the renewal of address.
(4) during the non-IP device access network in application domain, non-IP device is first to application domain administrative center transmitting apparatus title and the only sign of equipment, and utility control center is set up the inquiry that address is shone upon and be responsible in corresponding address after receiving facility registration request.When the title of equipment or sign change, equipment need to send identification renewal request to application domain administrative center, and facility information is upgraded.
If the inner IP device of digital home adopts IPv6 addressing mode, concrete addressing flow process is as follows:
(1) all IP devices of household internal carry out address assignment and management by external network gateway unification to it when access network.
(2) similar to IPv4 mode, the non-IP device of household internal need to be registered to the application domain administrative center at its place when access network, and the maintenance and management process of address is responsible for by application domain administrative center.
3. devices communicating method in the digital family network system based on the integration of three networks
Existing TCP/IP model is comparatively ripe, but its institute's communication technology of supporting is more single, mainly supports some communication technology standards that IEEE802 working group formulates.In order to shield the physics standard difference of the multiple communication technology, proposed to meet the traffic model that merges multiple communication technology demand under this structure, this model is separated equipment addressing and the service application on concrete physical communication technology and upper strata, thus realize between the inner distinct device of digital home network and and external network between interconnect.
As shown in Figure 4, improved model, on the basis of original TCP/IP model, is introduced universal chain circuit control layer (GLC) and is provided unified link layer data processing function for different communication modes.The function of universal chain circuit control layer comprises:
(1), as the convergence-level of different access technologies, for various upper-layer protocols above provide unified interface, reach the object of shielding different communication technological disparity;
(2) the MAC function of different access technologies controlled and supplemented, reach effective utilization of resource and maximize application layer performance;
(3) keep the modular construction of network protocol layer, to support the fusion of different access technologies;
(4) provide link layer state information to upper strata, to support the mobile management between effective access network.
According to designed digital home network framework, the communication means of the equipment room under this framework has been proposed.Take home gateway as node network can be divided into digital home inner with two parts of external network.Devices communicating demand in digital home network has comprised following two aspects: the communication between inner each smart machine of Yi Shi digital home; Another be digital home's external network with inside terminals between communicate by letter.
1) interconnecting between the inner various smart machines of digital home
It is unpractical that terminal in application domain only adopts a kind of communication mode, and there is no after all a certain communication technology is that comprehensively every kind of technology all has its distinctive advantage, and also has certain limitation simultaneously.Adopt communication, the mutual supplement with each other's advantages that realizes the communication technology is only the structure direction of digital home network.
Certainly adopting the multiple communication technology is not to use all communication modes, but choose one or more as its main communication mode according to the feature in different application territory, in family's entertainment applications territory, use the service such as see a film, play games, the communication mode that just need to have high QoS to guarantee, therefore can adopt wired Ethernet or wireless WLAN technology.According to the feature in different application territory, provided the communication mode of some recommendations here.Family's communication domain: 3G, Wimax, HomePNA etc.; Smart Home territory: WLAN, WSN etc.; Home entertaining territory: Ethernet, cable television network etc.; Work-at-home territory: Ethernet, WLAN etc.At a distance of closer equipment, also can use the wireless personal area network network communication technology.Normally used wireless personal area network technology has: bluetooth, UWB, Zigbee etc.It is high that these technology have speed, and transmitting procedure must be through advantages such as other trunkings.
Because the communication mode that allows each terminal have all kinds is unrealistic, be also not attainable.Therefore, we need to adopt other structures to realize the communication with different communication mode terminal.The improved TCP/IP model of joint in reference, can be by application domain boundary, borde gateway being set, and be that different standards is added universal chain circuit control layer GLC, is responsible for different mac-layer protocols to change, thereby realizes interconnecting of terminal equipment.Traffic model under this digital home network framework between digital home network inside terminals IP device as shown in Figure 5.
With reference to addressing structure, for the non-IP device Shi You administrative center in digital home network, by modes such as device identifications, position and addressing, and administrative center has IP address, therefore can by the administrative center of this equipment, realize with non-IP device and communicating.In administrative center when receiving corresponding application request message, first by request analysis, then generate the order that non-IP device can identify and send to non-IP terminal to carry out by corresponding communication mode, the result of returning after complete also will be configured to corresponding reply message by administrative center and send to request end.
As shown in Figure 6, the figure illustrates the communication process that digital home unifies digital home network inside terminals under business management network framework:
1. represent same communication mode equipment in application domain between communication process: adopt unified technical communication technology directly to communicate, such as bluetooth or Zigbee etc.
2. represent different communication mode equipment in application domain between communication process: first communication source equipment send message to application domain borde gateway, protocol conversion function by borde gateway will send to target device after message restructuring again, thereby realizes whole communication process.
3. represent across application domain communication process: communication source equipment sends message to application domain borde gateway, it is non-this territory equipment that borde gateway detects target device, then message is transmitted to the borde gateway in territory, target device place, if gateway communication mode is identical with target device, directly send to target device; If communication mode is different, need to carry out protocol conversion, message restructuring is finally sent to target device, complete whole communication process.
2) digital home network inner with outside various heterogeneous networks between communicate by letter
For external network and communicating by letter of internal network, mainly by home gateway, realize.Family's external network be take computer (Internet), telecommunications and three kinds of networks of radio and television as main now, three kinds of network interfaces of this providing by home gateway, the resource in these 3 kinds of networks all can be accessed or use to various terminals in digital home, and user also can be visited and be controlled by external network the terminal of household internal simultaneously.With external network communication process in, home gateway has played key effect.
Concrete communication process is as follows: first communication source equipment send message to home gateway, home gateway, according to the difference of user institute request service belonging network, carries out user's message by corresponding network interface, to send to the equipment in objective network again after corresponding protocol conversion and message restructuring.
4. digital home network structure embodiment
Coordinate accompanying drawing 7 to further illustrate by a concrete application example flow process that under framework of the present invention user uses digital home services below:
Example: be connected with the intelligent electric appliances such as microwave oven, electric fan, air-conditioning in the Smart Home application domain of digital home, when user can use computer or mobile phone to carry out in advance work by computer network and these equipment of communication network Long-distance Control in company or on the way home time, when user goes back home, dinner has been carried out and indoor temperature has also been adjusted to perfect condition.
Whole service is used flow process to comprise two stages: user authenticates, authorization stages and service operational phase.Consider the remote user access safety problem in when service, before user uses service, should first to user's identity, authenticate, when authentication by after user can use service.Concrete use flow process is as follows:
Step is 1.: long-distance user sends access home network requests to home gateway; The security centre that home gateway is distributed to safety management platform by request carries out user's authentication work;
Step is 2.: after authentication is passed through, home gateway is transmitted to Business Management Platform by user's service request, detects user whether have the authority of using this service by Business Management Platform;
Step is 3.: after authorization of service passes through, Business Management Platform sends authorization of service result to service application domain center, place, and center is transmitted to result the service equipment that respective service is provided again, and then service equipment will be set up corresponding connection with long-distance user;
Step is 4.: long-distance user passes through set up being connected with service equipment and communicates, and starts to serve use procedure: long-distance user is to home services equipment sending controling instruction, and service equipment is carried out user's instruction and also to user, returned to corresponding execution result.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Symbol description:
3G (The3rd Generation) third generation
DNS (Domain Name System) domain name system
DOS (Deny of Service) vetos service
The general link of GLC (Generic Link Control) is controlled
HomePNA (Home Phoneline Network Alliance) HPNA Home Phoneline Networking Alliance
The safe IP agreement of IPSec (IP Security)
L2TP (Layer2Tunneling Protocol) Level 2 Tunnel Protocol
MAC (Media Access Control) media access control
NAT (Network Address Translation) network address translation
PDA (Personal Digital Assistant) personal digital assistant, palmtop PC
PPTP (Point to Point Tunneling Protocol) Point to Point Tunnel Protocol
QoS (Quality of Service) service quality
SP (Service Port) serve port
UWB (Ultra Wideband) the carrierfree communication technology
The access of Wimax (Worldwide Interoperability for Microwave Access) worldwide interoperability for microwave
WLAN (Wireless Local Area Network) WLAN (wireless local area network)
WSN (Wireless Sensor Network) wireless sensor network
Zigbee IEEE802.15.4 communication protocol
Claims (2)
1. the digital family network system of a triple play oriented, it is characterized in that, according to the business demand of digital home, network is divided into different application domains, business in digital home is similar, functional requirement is close information terminal apparatus is connected in same application domain; The digital family network system building on the basis of division application domain is comprised of information terminal apparatus, network access device, application domain administrative center and four kinds of network entities of home gateway; Described information terminal apparatus refers to the network entity of carrying out concrete digital home business function; Described network access device refers to realizes the network entity that each terminal room of Access Network interconnects, and comprises wireless, super joint, borde gateway; Borde gateway is disposed the modified model ICP/IP protocol stack that adopts universal chain circuit control layer GLC, physical layer and media Access Layer are supported multiple different physical communication interface and media access protocol, GLC layer is controlled and is supplemented the MAC function of different access technologies, and keep the modular structure of network protocol layer, by unified interface, link layer information is offered to upper strata; Described application domain administrative center can manage the information terminal apparatus in same application domain in home network and the business service providing thereof; This application domain administrative center can be integrated into borde gateway equipment, also independently center management server can be set separately; Described home gateway is managed concentratedly by setting up the responsible business that external network is provided of digital home network management platform and each application domain of internal network.
2. be applied to the communication means in the digital family network system of triple play oriented according to claim 1, it is characterized in that,
In application domain, between same communication mechanism equipment, can directly communicate;
Communication in application domain between different communication mechanism equipment: first communication source equipment send message to application domain borde gateway, the protocol conversion function by application domain borde gateway will send to target device after message restructuring again, thereby realize whole communication process;
Different application territory communication between devices: communication source equipment sends message to application domain borde gateway, it is non-this territory equipment that borde gateway detects target device, then message is transmitted to the borde gateway in territory, target device place, if gateway communication mode is identical with target device, directly send to target device; If communication mode is different, need to carry out protocol conversion, message restructuring is finally sent to target device, complete whole communication process;
Digital home inner with equipment in outside various heterogeneous networks between communicate by letter: communication source equipment is first to home gateway transmission message, home gateway, according to the difference of user's request service belonging network, carries out user's message by corresponding network interface, to send to the equipment in objective network again after corresponding protocol conversion and message restructuring.
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