CN103369401A - A video-on-demand system implementation method based on wireless data return - Google Patents
A video-on-demand system implementation method based on wireless data return Download PDFInfo
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- CN103369401A CN103369401A CN 201210089316 CN201210089316A CN103369401A CN 103369401 A CN103369401 A CN 103369401A CN 201210089316 CN201210089316 CN 201210089316 CN 201210089316 A CN201210089316 A CN 201210089316A CN 103369401 A CN103369401 A CN 103369401A
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Abstract
Provided is a video-on-demand system implementation method based on wireless data return. Under the circumstance of not reconstructing an original unidirectional cable television network, a return channel of demanded data is achieved by disposing a Zigbee wireless network. A return network comprises a Zigbee terminal module, a route node, and a district base station. The Zigbee network is used for transmitting communication data between a set top box and video-on-demand front end. The Zigbee terminal module comprises an Ethernet interface which is connected with an Ethernet interface of a bidirectional set top box. A demand instruction of the set top box is wirelessly transmitted back to the district base station via a frequency band of 780MHz. The district base station transmits the demanded data returned by the Zigbee network back to a district optical node in a wired manner. And then the demanded data is transmitted back to a video-on-demand business front-end device via a fiber uplink channel.
Description
Technical field
The present invention relates to a kind of video on-demand system implementation method based on the wireless data passback.More particularly, relate to a kind of use Zigbee wireless network passback order program data, realize the method for video on-demand system in conjunction with unidirectional Cable Digital TV Network.
Background technology
Cable TV network is the data transfer mode of traditional unidirectional downlink broadcast, carry out video request program (VOD) business, must user's order request be sent to by return path the front end system of VOD service.Bidirectional rebuilding by CATV HFC Network can realize reverse return path.But for the relatively poor old unilateral network of basic condition, and the application scenarios that two-way services take up rate, permeability is lower, legacy network is carried out comprehensive bidirectional rebuilding and uneconomical.Use wireless mode to realize that return path has lower deployment cost low, fireballing advantage is not needing to transform under the prerequisite of existing cable network in advance fast-developing user, is commencing business.When user and business development are carried out modernization overlay to the whole network to a certain extent the time again.
Video request program and two-way interaction value-added service similarly, such as time-moving television, real-time audience rating investigating, TV voting, information inquiry, TV shopping etc., these type of professional characteristics are: (1) uplink and downlink data are asymmetric, descending normally audio/video information, and the same transmission of unidirectional television broadcast data; Mostly up be the information such as control, state.(2) the transmitting uplink data amount is low: take the VOD business as example, normal, a complete VOD operation flow only need to return 3～8 times ascending control information in 10～20 seconds, each maximum several crossed joints that need.(3) requirement of real time is low: respond to acquisition in the operation of terminal from the user, 1,2 second response time was user's acceptable.(4) upstream data burst is low: digital TV set-top box back information amount is little, and the probability that the multi-user uploads simultaneously is lower.
ZigBee is a kind of low cost, the near radio networking mechanics of communication of low-power consumption.Floor layer Technology is based on IEEE 802.15.4.Be suitable between the not high various electronic equipments of short distance, low-power consumption and transmission rate request the transmission of execution cycle property data, intermittent data and low reaction time data.Zigbee network contains full-function device FFD and simplifies the equipment of two kinds of function types of function device RFD.The node that comprises three types, i.e. telegon, router and terminal equipment, wherein telegon and router are full-function device, terminal equipment can be selected and simplify function device.According to standard GB/T/T 15629.15-2010, this network works in the 780MHz frequency range in physical layer, compares the 2.4GHz frequency range, has a diffracting power good, but the cut-through thing, the advantage such as transmission range is farther, and the anti-multipath attenuating is good.
Summary of the invention
The object of the present invention is to provide a kind of video on-demand system implementation of the Zigbee of utilization wireless network passback data.Can be in the situation that original wired TV coaxial cable net network not be carried out bidirectional rebuilding, rapid deployment and carry out the two-way video demand (telecommunication) service.
Purpose of the present invention is achieved by the following technical programs.
A kind of video on-demand system provided by the invention, by the video request program headend equipment, transmission network, ustomer premises access equipment three parts form.Headend equipment comprises the VOD business management system, VOD video server, VOD library of programmes, edge modulator (IPQAM) etc.; Transmission network comprises the radio and television front end to the transmission line of residential quarter optical node, the unidirectional coaxial cable distribution network in the residential quarter in the user family, and the Zigbee network that is comprised of cell base station and user Zigbee wireless transport module; Ustomer premises access equipment is the top box of digital machine with VOD function.
Down going channel is provided by the unidirectional coaxial hybrid network of cable TV optical fiber in the video on-demand system, and the return path of order program data is provided by the Zigbee wireless network that is deployed in the residential quarter.The Zigbee wireless network is by cell base station, and routing node and Zigbee terminal module form.Zigbee network is used for the communication data between transparent transmission set-top box and the video request program front end.The Zigbee terminal module has Ethernet interface, connects the Ethernet interface of bi-directional set-top box, uses 780MHz frequency range wireless backhaul to cell base station the program request instruction of set-top box.Be to enlarge wireless network coverage and laser propagation effect, in position as corridor etc. locate to set up routing node, utilize the advantage of Zigbee network networking to compile also forwarding data to cell base station.Cell base station is passed the order program data of Zigbee network passback back the residential quarter optical node in wired mode, utilizes the uplink optical fiber passage to transfer back to the VOD service headend equipment.
The user who opens demand (telecommunication) service uses bi-directional set-top box, and configuration Zigbee terminal module.Front end VOD service management system activates the service for the user and uses charging policy.The Zigbee module is connected with bi-directional set-top box by Ethernet interface.Cell base station is as the telegon in the Zigbee network.
After user's start, the Zigbee terminal adds network, connects with cell base station.Optionally can directly connect the cell base station telegon or be connected to cell base station by being deployed in the routing node that corridor etc. locates.Set-top box is obtained the IP address by the DHCP mode, and this DHCP request is transparent to the residential quarter optical node by Zigbee network, and passes the VOD service management system of front end back by the uplink optical fibers channel.Business management system is set-top box distributing IP address, connects, and Zigbee network is transparent data between set-top box and the front end system.The VOD service front end is by downlink channel transmission request program table, and the user makes program request by browser and selects on set-top box, and this order request information exchange crosses above-mentioned Zigbee network and the uplink optical fiber passage is back to front end program request business management system.Operation system control video server is broadcast the video frequency program in the library of programmes, and, QAM multiplexing by edge modulator modulates and the RF up-conversion, broadcasts to set-top box via the digital cable TV down channel.
The invention has the beneficial effects as follows, for the old residential quarter of cable tv coax circuit, and under the application scenarios that two-way services take up rate, permeability is lower, do not need whole one-way CATV network network is carried out bidirectional rebuilding, can carry out fast the two-way services such as video request program.It is low, low in energy consumption that the Zigbee module that return network uses and node have a cost, the characteristics such as networking flexibility.The working method of the bi-directional set-top box of video request program front end system and terminal and passback mode are irrelevant, have versatility.Therefore can dispose simultaneously in the residential quarter of different condition different passback technical schemes (comprising various wired, wireless passback modes), indifference concerning front end system and terminal use.After the transformation of finishing cable network, the front end system that this system uses and the bi-directional set-top box of terminal do not need to change, and directly the Zigbee wireless module are replaced with wired network interface and get final product.Simultaneously, the Zigbee node in the residential quarter can also be used for security protection, and the Internet of Things such as sensing are used.
Description of drawings
Fig. 1 is the video on-demand system operation principle schematic diagram that the present invention is based on the wireless data passback.
Embodiment
A kind of video on-demand system provided by the invention, by the video request program headend equipment, transmission network, ustomer premises access equipment three parts form.Headend equipment comprises the VOD business management system, VOD video server, VOD library of programmes, edge modulator (IPQAM) etc.; Transmission network comprises the radio and television front end to the transmission line of residential quarter optical node, the unidirectional coaxial cable distribution network in the residential quarter in the user family, and the Zigbee network that is comprised of cell base station and user Zigbee wireless transport module; Ustomer premises access equipment is the top box of digital machine with VOD function.
Video on-demand system each several part major function:
One. the video request program headend equipment:
(1) VOD business management system: the functions such as server admin, user management, accounting management, statistical management and advertising management are provided, can Returning catalogue information, to user's program request mandate and charging, control video server broadcast items;
(2) VOD library of programmes: be used for storage magnanimity program, read for video server;
(3) VOD video server: high performance video server, storage and the transmission of management video-audio program are the nucleus equipments that VOD system responses user asked, also automatically broadcast request program; The expansion of support stack.
(4) edge modulator (IPQAM):, QAM multiplexing for program stream is carried out modulates and the RF up-conversion, to promote the VOD channel density and to be convenient to transmit in hfc plant.In the situation that the program request customer volume seldom, IPQAM can place front end, along with being on the increase of a broadcasting user, can be gradually by front end transfer to sub-headend and even optical node realizing other frequency division multiplexing of community-level, and can increase program request when supporting more users of IPQAM equipment according to actual program request amount.
Two. transmission network
Optical fiber transmission network: the optical transceiver of front end adopts Optical Fiber Transmission between the optical node of residential quarter, downlink transfer cable tv broadcast program and video frequency request program.Use optical fiber for subsequent use or adopt wavelength-division multiplex technique, increase fiber optical transceiver and realize the uplink passage, be used for the application such as program request.
Coaxial cable distribution net: the residential quarter optical node adopts coaxial cable distribution net in user family.Coaxial network without bidirectional rebuilding only is used for transmitting descending broadcasting and order video.
Zigbee network: by cell base station, routing node and Zigbee terminal module form.Zigbee network is used for the communication data between transparent transmission set-top box and the video request program front end.The Zigbee terminal module has Ethernet interface, connects the Ethernet interface of bi-directional set-top box, uses 780MHz frequency range wireless backhaul to cell base station the program request instruction of set-top box.Be to enlarge wireless network coverage and laser propagation effect, in position as corridor etc. locate to set up routing node, utilize the advantage of Zigbee network networking to compile also forwarding data to cell base station.Cell base station is passed the order program data of Zigbee network passback back the residential quarter optical node in wired mode, utilizes the uplink optical fiber passage to transfer back to the VOD service headend equipment.
Three .VOD top box of digital machines:
The VOD top box of digital machine: TV user realizes video on-demand function by the operation to top box of digital machine.Set-top box has Ethernet RJ45 interface, and operation is based on the video-on-demand applications of middleware.The VOD set-top box is sent to front end VOD system with the program request instruction of TV user, and receiving front-end the VOD page or the VOD program stream that issue.
The video on-demand system workflow:
The user who needs is opened demand (telecommunication) service changes bi-directional set-top box, and configuration Zigbee terminal module.Front end VOD service management system activates the service for the user and uses charging policy.The Zigbee module is connected with bi-directional set-top box by Ethernet interface.Cell base station is as the telegon in the Zigbee network.
After user's start, the Zigbee terminal adds network, connects with cell base station.Optionally can directly connect the cell base station telegon or be connected to cell base station by being deployed in the routing node that corridor etc. locates.Set-top box is obtained the IP address by the DHCP mode, and this DHCP request is transparent to the residential quarter optical node by Zigbee network, and passes the VOD service management system of front end back by the uplink optical fibers channel.Business management system is set-top box distributing IP address, connects, and Zigbee network is transparent data between set-top box and the front end system.The VOD service front end is by downlink channel transmission request program table, and the user makes program request by browser and selects on set-top box, and this order request information exchange crosses above-mentioned Zigbee network and the uplink optical fiber passage is back to front end program request business management system.Operation system control video server is broadcast the video frequency program in the library of programmes, and, QAM multiplexing by edge modulator modulates and the RF up-conversion, broadcasts to set-top box via the digital cable TV down channel.
Claims (2)
1. video on-demand system implementation method based on wireless data passback, system comprises the video request program headend equipment, transmission network, ustomer premises access equipment three parts, it is characterized in that: described video on-demand system is realized the return path of order program data in the situation that original one-way CATV network network is not carried out the network rebuilding by disposing the Zigbee wireless network.
2. return path as claimed in claim 1, it is characterized in that: by the Zigbee terminal module, routing node and cell base station form, and the Zigbee terminal module uses 780MHz frequency range wireless backhaul to cell base station the program request instruction of set-top box by Ethernet interface; Cell base station is passed the order program data of Zigbee network passback back the residential quarter optical node in wired mode, utilizes the uplink optical fiber passage to transfer back to the VOD service headend equipment.
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| CN 201210089316 CN103369401A (en) | 2012-03-30 | 2012-03-30 | A video-on-demand system implementation method based on wireless data return |
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| CN 201210089316 CN103369401A (en) | 2012-03-30 | 2012-03-30 | A video-on-demand system implementation method based on wireless data return |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105847731A (en) * | 2016-04-07 | 2016-08-10 | 国网福建省电力有限公司 | Bidirectional broadband access and interaction demand system based on LTE and coaxial cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105847731A (en) * | 2016-04-07 | 2016-08-10 | 国网福建省电力有限公司 | Bidirectional broadband access and interaction demand system based on LTE and coaxial cable |
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