CN103916375B - The encapsulation of hfc plant downlink data multichannel and transmission method - Google Patents
The encapsulation of hfc plant downlink data multichannel and transmission method Download PDFInfo
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- CN103916375B CN103916375B CN201310007848.2A CN201310007848A CN103916375B CN 103916375 B CN103916375 B CN 103916375B CN 201310007848 A CN201310007848 A CN 201310007848A CN 103916375 B CN103916375 B CN 103916375B
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Abstract
The present invention relates to a kind of hfc plant downlink data multichannel encapsulation and transmission method, for including in the IP duplex channel hfc plant with multiple QAM half-duplex channels；The method includes: the information of the multiple QAM passages specified, before the data that user asks are sent to receiving terminal, is sent to described receiving terminal by transmitting terminal；Packet in the data that user is asked by transmitting terminal is separately dispensed into the multiple QAM passages specified and is packaged；Packet after the multiple QAM channel parallels transmission encapsulation specified；Receiving terminal receives data on the multiple QAM passages specified parallel, and realizes the order recovery of packet according to traffic stream identifier field and business data packet sequence number field.
Description
Technical field
The present invention relates to network communication field, particularly to a kind of hfc plant downlink data multichannel encapsulation and transmission side
Method.
Background technology
In IP communication field, SCTP(Stream Control Transmission Protocol flow control transmission side
Method) it is a transport layer method of ietf definition, by many hosts (Multi-homing) and multithread (Multi-streaming)
Function, provides stable, orderly data delivery service between the two endpoints.The SCTP method of standard only supports active/standby mode
Multichannel coordinated transmission, does not support that multi-channel parallel transmits, and underuses the advantage of plurality of passages yet, and a lot of scholars are to standard
SCTP method be modified, be allowed to support multi-channel parallel transmission mechanism, such as CMT-SCTP, LS-SCTP etc..
At hfc plant communication field, DOCSIS(Data Over Cable Service Interface
Specification, Data Over Cable Service interface standard) in hfc plant, carry out high speed and bidirectional data transfers.2008
Issue the latest edition 3.0 of DOCSIS method, add channel binding (Channel Bonding) technology, by self-defining
Multiple physical channels are bound together by MAC method, form a channel group, it is achieved the higher logic channel of bandwidth, increase
Add downstream transmission speed so that the online implementation of class of cable television is similar to the multi-channel parallel transmission technology of the SCTP improved,
Meet the bandwidth demand of user well.
In the case of HFC unilateral network, in order to adapt to the transmission at QAM passage of the IP data, it has been proposed that various applicable
In IP over DVB(IP based on DVB specification transmission mechanism) IP data encapsulation method, specifically include that DVB
The MPE(Multi-protocol Encapsulation proposed, multi-protocol encapsulation) and GSE(Generic Stream
Encapsulation, general flow encapsulates) and the ULE(Unidirectional Lightweight of IETF proposition
Encapsulation, unidirectional lightweight encapsulates), wherein MPE and ULE all uses the physical layer packet structure of MPEG-TS form, and
GSE uses the physical layer packet structure of DVB a new generation broadcast system.
Along with the reduction of demodulator cost, a receiving terminal can have multiple demodulator, and therefore receiving terminal can be at multiple QAM
Receive data on passage parallel, and three of the above method does not the most possess and supports what multi-channel parallel transmitted as DOCSIS standard
Ability.So proposing a kind of downlink data multichannel encapsulation being applied to IP over DVB and transmission method, IP data are existed
Parallel transmission under non-DOCSIS application scenarios has very important meaningful.
Summary of the invention
It is an object of the invention to overcome existing method can not support the defect that multi-channel parallel transmits, thus provide one
Plant the method being capable of downlink data channel transmission.
To achieve these goals, the invention provides a kind of hfc plant downlink data multichannel encapsulation and transmission method,
For including in the IP duplex channel hfc plant with multiple QAM half-duplex channels；The method includes:
Step 1), transmitting terminal before the data that user asks are sent to receiving terminal, the letter of multiple QAM passages that will specify
Breath is sent to described receiving terminal；
Step 2), packet in described transmitting terminal data that described user is asked be separately dispensed into described specify many
Individual QAM passage is also packaged；Described encapsulation includes:
Step 2-1), add channel transmission key-course field, described channel transmission control for packet to be transmitted
Preparative layer field includes the bag transmission sequence number field in traffic stream identifier field, business data packet sequence number field, transmission channel；
Step 2-2), according to traffic stream identifier field described in the category label of business service, according to packet at Business Stream
The sequence notation business data packet sequence number field of middle appearance, pass according to packet transmission sequence labelling in QAM transmission channel
Bag transmission sequence number field in defeated passage；
Packet after step 3), the described multiple QAM channel parallels transmission encapsulation specified；
Step 4), described receiving terminal receive data on the described multiple QAM passages specified parallel, and according to described business
Traffic identifier field and business data packet sequence number field realize the order recovery of packet.
In technique scheme, in described step 4), according to described traffic stream identifier field and business data packet
Sequence number field realizes the order recovery of packet and includes:
Step 4-1), in the decoder corresponding to a QAM passage specified, according to described traffic stream identifier field will
Received, to belong to same Business Stream packet is concentrated；
Step 4-2), receiving terminal after corresponding decoder receives all packets of a certain Business Stream, according to described
Business data packet sequence number realizes the sequence to all packets, recovers the normal sequence of all packets in this Business Stream.
In technique scheme, step 4-1 described) and step 4-2) between also include:
Step a), judge whether to lost packet according to the bag transmission sequence number field in described transmission channel, work as loss
After packet, lost packet is retransmitted.
In technique scheme, described step a) includes:
Step a-1), the packet belonging to same Business Stream carries out by decoder according to the bag transmission sequence number in described passage
Whether sequence, there occurs packet loss phenomenon according in ranking results detection current business flow, if it occur that packet loss phenomenon, perform next
Step, otherwise terminates the data retransmission operation to this decoder；
Step a-2), be found to have the decoder of data-bag lost and fed back to transmitting terminal by IP duplex channel, it is desirable to retransmit
The packet lost, transmitting terminal receives this feedback laggard row data packet retransmission.
In technique scheme, in described step 1), the information of described QAM passage include frequency, program number mark,
Modulation system.
In technique scheme, in described step 1), the information of described QAM passage is transmitted via IP duplex channel,
Or transmitted by hfc plant.
In technique scheme, the step 2 described) in, the number in the data that described user is asked by described transmitting terminal
When being separately dispensed into the described multiple QAM passage specified according to bag, use the mode of load balancing, or the mode according to poll.
In technique scheme, described channel transmission key-course field is added on existing IP over DVB encapsulation and assists
Between view layer and IP layer.
It is an advantage of the current invention that:
1. use the encapsulation of downlink data multichannel and transmission method so that system can be passed parallel by multiple passages
Defeated, the dilatation access bandwidth of terminal, improve resource utilization.
2. between existing IP over DVB tunneling layer and IP layer, increase channel transmission layer, to existing IP
The method stacks such as method stack and MPE, ULE are transparent, it is not necessary to modify it.
3. the process that packet sequence is recovered is a merger process, it is only necessary to travel through the most all of packet, just can be by
What packet was correct sequences sequence, and computation complexity is low.
Accompanying drawing explanation
Fig. 1 is the graph of a relation between channel transmission key-course and other protocol layers involved in the present invention；
Fig. 2 is the schematic diagram of the Bidirectional HFC Network that can be applied to the inventive method；
Fig. 3 is the schematic diagram of the downlink data multichannel encapsulation format being applied to MPE of the present invention；
Fig. 4 is the schematic diagram of data retransmission processes in one embodiment.
Detailed description of the invention
In conjunction with accompanying drawing, the invention will be further described.
The downlink data multichannel encapsulation being applied to IP over DVB of the present invention is existing with transmission method
Extend on the basis of IPover DVB tunneling.The method for packing such as known such as ULE, MPE, GSE are all to seal IP
The agreement of dress, as it is shown in figure 1, the method for the present invention adds channel transmission key-course at the head of IP bag, uses MPE the most again
Or ULE or GSE is packaged, any one tunneling being suitable in ULE, MPE, GSE.In following example,
As a example by MPE tunneling, the method for the present invention will be elaborated.
Fig. 2 is the schematic diagram of a Bidirectional HFC Network that can be applied to the inventive method, of this Bidirectional HFC Network
Frequency dividing rate is used for transmitting IP bi-directional data, and another part frequency is used for transmitting digital television service, such as live telecast, interactive VOD
Deng；This Bidirectional HFC Network i.e. has IP tunnel and QAM passage simultaneously.Specifically, in the network, including a transmitting terminal, one
Receiving terminal, the interface channel between described transmitting terminal and receiving terminal is divided into an IP duplex channel and multiple QAM half-duplex channel, connects
The upstream data bag of receiving end is transferred to transmitting terminal by described IP tunnel, and the downlink data packet of transmitting terminal is optional two-way by IP
Passage or QAM half-duplex channel are transferred to receiving terminal, it is possible to be transferred to receiving terminal by two passes simultaneously.Due to QAM passage
Bandwidth is far longer than the bandwidth of IP tunnel, and the most in the present embodiment, downlink data is mainly descending by parallel QAM passage.
The Set Top Box of receiving terminal has multiple decoder, the available QAM passage of each decoder lockable one.This Bidirectional HFC Network can
Being connected with outside network, described external network can have polytype, such as the Internet, hfc plant etc..
Before the method for the present invention is elaborated, the first data to packet involved in the inventive method
Form does corresponding explanation.Fig. 3 is the downlink data multichannel encapsulation format that the present invention is applied to MPE.It can be seen that
Fill field (optional), verification and (4 byte), that MPE head (12 byte) and existing MPE encapsulate standard is completely the same, manifold
The load that road transmission control layer encapsulates collectively as MPE with IP packet, wherein channel transmission key-course includes again Business Stream
Three fields of bag transmission sequence number in mark, business data packet sequence number, passage.Traffic stream identifier field (4 byte), is used for distinguishing
Different business service；Business data packet sequence number (4 byte), as packet sequence number in Business Stream, to ensure receiving terminal
The sequentially recovery of packet；Bag transmission sequence number (4 byte) in passage, as packet sequence number in transmission channel, with
The quick loss detection wrapped in passage is provided.The present invention be applied to the downlink data multichannel encapsulation format of ULE or GSE with etc
Seemingly, in addition to the standard meeting related protocol, in also should at least including traffic stream identifier, business data packet sequence number, passage
Three fields of bag transmission sequence number.
After the applied environment of the inventive method and the multichannel encapsulation format of packet are elaborated, below
With reference to Fig. 2, the method according to the invention, the data interaction flow process of transmitting terminal and receiving terminal in described Bidirectional HFC Network is done in detail
Describe in detail bright.This data interaction flow process comprises the steps:
Step 201), the business of user's request reach transmitting terminal with the form of IP datagram literary composition, transmitting terminal determines by 3
Data in IP datagram literary composition are sent to receiving terminal by QAM passage, transmitting terminal by mutual signaling by these 3 QAM channel informations
It is sent to receiving terminal.
Step 202), transmitting terminal be in data stream each packet according to business service classification add traffic stream identifier,
The order occurred in Business Stream according to packet adds business data packet sequence number, is then divided respectively by the packet in data stream
3 QAM passages described in dispensing, are added the bag transmission sequence number in respective passage for the packet after distribution, then are sealed by MPE form
Dress packet, is encapsulated as DVB form again by the MPE data message after encapsulation, sends to QAM by the way of UDP message message
Passage.
Step 203), packet transmits in QAM passage.
Step 204), receiving terminal receive data parallel at 3 corresponding QAM passage frequency lockings, the decoder in receiving terminal obtains
Take the load of DVB data encapsulation, pay MPE method stack and resolve, the packet obtained by after resolving is carried out order recovery,
Obtain the data message of correct order.
Step 205), receiving terminal by the data stream of correct order, the IP packet after i.e. resolving submits to upper layer application.
Below above-mentioned steps is described further.
In step 201) in, the mutual signaling including QAM channel information that transmitting terminal is sent to receiving terminal is via IP
Duplex channel is transmitted, or is transmitted by hfc plant.
In step 201) in, described QAM channel information includes but not limited to the letters such as frequency, program number mark, modulation system
Breath.
In step 202) in, various ways can be used the allocation of packets in data stream to different QAM passages, as
According to the mode of load balancing, or the mode according to poll, it is also possible to according to other modes.
In step 202) in, the bag transmission sequence number in described passage according to certain law generation, as sequentially or
According to a certain ranking functions.
In step 204) in, the packet after resolving is carried out order recovery and includes:
Step 204-1), in the decoder corresponding to an available QAM passage, according to described traffic stream identifier field
Received, to belong to same Business Stream packet is concentrated；
Step 204-2), receiving terminal after corresponding decoder receives all packets of a certain Business Stream, according to institute
State business data packet sequence number and realize the sequence to all packets, recover the normal sequence of all packets in this Business Stream.
It is above the basic step of the inventive method.In above-mentioned data interaction flow process, the packet in data stream is torn open
Assign to different QAM passages, encapsulated data packet, when delivering a packet to QAM passage and transmit packet in QAM passage
It is likely to occur packet loss phenomenon, packet loss once occurs, the integrity of data transmission will be affected.As a kind of preferred implementation side
Formula, the method for the present invention also includes the operation retransmitting lost data packets.Below in conjunction with step 204) in order recovery,
With reference to Fig. 4, being been described by the data retransmission processes in the inventive method, key step is as follows:
Step 301), a certain decoder in receiving terminal after corresponding QAM channel reception packet, with traffic stream identifier
Being distinguish between according to the difference of Business Stream by received data bag for index, the packet of same Business Stream is classified as at one.
Step 302), the packet belonging to same Business Stream carries out by decoder according to the bag transmission sequence number in described passage
Whether sequence, there occurs packet loss phenomenon according in ranking results detection current business flow, if it occur that packet loss phenomenon, perform next
Step, otherwise terminates the data retransmission operation to this decoder.
Mentioning before, follow certain rule when the bag transmission sequence number generated in passage, this is in and detects whether to occur
During packet loss phenomenon, it is possible to follow this rule.Once find that bag transmission sequence number does not meets corresponding rule, it is believed that there occurs
Packet loss phenomenon.
Such as, the data belonging to same Business Stream received are surrounded by 2, and the bag transmission sequence number in their passage is respectively
It is 1,3, this illustrates the in this Business Stream the 2nd data and wrap in loss in transmitting procedure.
Step 303), be found to have the decoder of data-bag lost and fed back to transmitting terminal by IP duplex channel, it is desirable to retransmit
The packet lost, transmitting terminal retransmits rapidly after receiving this feedback.
Such as, decoder 1 requires replay traffic 2 packet of serial number 2 in passage 1 to transmitting terminal, and transmitting terminal is fast
Speed retransmits.Retransmit packet serial number 6 in whole Business Stream 2.
Step 304), be found to have after the decoder of data-bag lost receives re-transmission data, by all received a certain
The packet of Business Stream submits to the remainder of receiving terminal.
Decoder 1 receives the data message 6 of re-transmission, and the data message that will get from single hardware decoder again
Submit to multi-channel method；
Step 305), receiving terminal after corresponding decoder receives all packets of a certain Business Stream, according to described
Business data packet sequence number realizes the sequence to all packets, recovers the normal sequence of all packets in this Business Stream.
It should be noted last that, above example is only in order to illustrate technical scheme and unrestricted.Although ginseng
According to embodiment, the present invention is described in detail, it will be understood by those within the art that, the technical side to the present invention
Case is modified or equivalent, and without departure from the spirit and scope of technical solution of the present invention, it all should be contained in the present invention
Right in the middle of.
Claims (7)
1. the encapsulation of hfc plant downlink data multichannel and a transmission method, is used for including IP duplex channel mono-with multiple QAM
In the hfc plant of passage；The method includes:
Step 1), transmitting terminal before the data that user asks are sent to receiving terminal, the information of the multiple QAM passages specified is sent out
Give described receiving terminal；
Step 2), packet in described transmitting terminal data that described user is asked be separately dispensed into described specify multiple
QAM passage is also packaged；Described encapsulation includes:
Step 2-1), add channel transmission key-course field, described channel transmission key-course for packet to be transmitted
Field includes the bag transmission sequence number field in traffic stream identifier field, business data packet sequence number field, transmission channel；
Step 2-2), according to traffic stream identifier field described in the category label of business service, go out in Business Stream according to packet
Existing sequence notation business data packet sequence number field, lead to according to packet transmission sequence flag transmission in QAM transmission channel
Bag transmission sequence number field in road；
Step 3), described specify multiple QAM channel parallels transmission encapsulation after packet；
Step 4), described receiving terminal receives data parallel on the described multiple QAM passages specified, and fails to be sold at auction according to described business
Character learning section and business data packet sequence number field realize the order recovery of packet；Wherein, according to described traffic stream identifier field
And business data packet sequence number field realizes the order recovery of packet and includes:
Step 4-1), in the decoder corresponding to a QAM passage specified, will be connect according to described traffic stream identifier field
That receive, belong to same Business Stream packet concentrate；
Step 4-2), receiving terminal after corresponding decoder receives all packets of a certain Business Stream, according to described business
Packet sequence number realizes the sequence to all packets, recovers the normal sequence of all packets in this Business Stream.
Hfc plant downlink data multichannel the most according to claim 1 encapsulation and transmission method, it is characterised in that in institute
Step 4-1 stated) and step 4-2) between also include:
Step a), judge whether to lost packet according to the bag transmission sequence number field in described transmission channel, when losing data
After bag, lost packet is retransmitted.
Hfc plant downlink data multichannel the most according to claim 2 encapsulation and transmission method, it is characterised in that described
Step a) including:
Step a-1), the packet belonging to same Business Stream arranged by decoder according to the bag transmission sequence number in described passage
Whether sequence, there occurs packet loss phenomenon according in ranking results detection current business flow, if it occur that packet loss phenomenon, perform next
Step, otherwise terminates the data retransmission operation to this decoder；
Step a-2), be found to have the decoder of data-bag lost and fed back to transmitting terminal by IP duplex channel, it is desirable to retransmit and lose
Packet, transmitting terminal receives this feedback laggard row data packet retransmission.
Hfc plant downlink data multichannel the most according to claim 1 and 2 encapsulation and transmission method, it is characterised in that
Described step 1) in, the information of described QAM passage includes frequency, program number mark, modulation system.
Hfc plant downlink data multichannel the most according to claim 1 and 2 encapsulation and transmission method, it is characterised in that
Described step 1) in, the information of described QAM passage is transmitted via IP duplex channel, or is transmitted by hfc plant.
Hfc plant downlink data multichannel the most according to claim 1 and 2 encapsulation and transmission method, it is characterised in that
Described step 2) in, the packet in the data that described user is asked by described transmitting terminal be separately dispensed into described specify many
During individual QAM passage, use the mode of load balancing, or the mode according to poll.
Hfc plant downlink data multichannel the most according to claim 1 and 2 encapsulation and transmission method, it is characterised in that institute
State channel transmission key-course field to be added between existing IP over DVB tunneling layer and IP layer.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106302043A (en) * | 2016-08-12 | 2017-01-04 | 成都广达新网科技股份有限公司 | A kind of C DOCSIS local side realizes multiple services ARP processing method |
| CN108683951B (en) * | 2018-05-11 | 2021-08-03 | 广州珠江数码集团股份有限公司 | Video data transmission method, device and system |
| CN110557230B (en) * | 2018-06-01 | 2022-09-23 | 国广融合（北京）传媒科技发展有限公司 | Data transmission method and system for unidirectional broadcast and bidirectional network |
| CN109981475B (en) * | 2019-03-27 | 2023-05-09 | 无锡海斯凯尔医学技术有限公司 | Data transmitting, receiving and transmitting method, device, system and readable storage medium |
| CN111586730B (en) * | 2020-05-27 | 2021-03-16 | 中铁电气化局集团有限公司 | Wireless communication method and system applied to rail transit |
| CN111835448B (en) * | 2020-07-27 | 2022-05-24 | 上海挚想科技有限公司 | Multi-channel communication time sequence control method and system |
| CN114567410B (en) * | 2020-11-27 | 2024-05-17 | 华为技术有限公司 | Signal frame processing method and related equipment |
| CN113515563A (en) * | 2021-03-31 | 2021-10-19 | 浙江大华技术股份有限公司 | Data docking method, database, system and computer-readable storage medium |
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| CN102572585A (en) * | 2010-12-08 | 2012-07-11 | 中国科学院声学研究所 | Method and system for high speed and parallel data reception and processing |
| CN102630044A (en) * | 2012-03-31 | 2012-08-08 | 中山大学 | Time-shifted television system based on HFC server cache |
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| CN2562531Y (en) * | 2002-08-26 | 2003-07-23 | 北京数码视讯科技有限公司 | Satellite signal data transmission stream receiving conversion modulator |
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