CN1181671A - CATV-based medium transmitting control method and network for realizing comprehesive business - Google Patents
CATV-based medium transmitting control method and network for realizing comprehesive business Download PDFInfo
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Abstract
A method for realizing medium transmission control of integrated service based on CATV network (cable TV network) features that the characteristics of cable TV network are fully utilized, that is, part of uptream-going channel is used to receive token and/or information and the token is transferred only to the nodes from which it is possible to transmit information, so shortening distance and time, reducing bandwidth and increasing the utilization rate of channel. Said integrated service network is composed of cable TV network, communication processor, modem, user terminate device and RF mixer. Said communication processor can be connected to another one, or to Internet server, on-demand program center, public network, etc.
Description
The present invention relates to realize that based on cable TV (CATV) net the medium of integrated service send the CATV integrated service network of getting control (MAC) method and adopting this method to make up.
Realize or make up the integrated service network or transmit the technology of multiple information known already based on CATV net, for example a kind of integrated service network that adopts existing tree CATV net and token bus MAC method is addressed in Patent Office of the People's Republic of China's 96 disclosed being entitled as on May 1, " comprehensive service network for cable television " patent application, overcome shortcomings such as former CATV integrated services network speed is low, purposes is special, scope is little, can constitute on a large scale, multiduty CATV integrated service network; But because information and token will send to data feedback channel, after the conversion of carrier frequency converter, be sent to down going channel again and give receiving node,, reduced the effective rate of utilization of channel so the delivery time is long, and takies the uplink and downlink passage simultaneously.On the other hand, the token in the above-mentioned patent application generally will travel through all nodes, and whether pipe node will not send data, and this has spent more the time again, has reduced effective efficiency.
General CATV net, particularly optical fibre-coaxial cable mixes in the CATV net of (HFC), all mark off partial-band specially and be used to transmit descending and upstream data. signals, be used to transmit upstream data. signals, mark off 550-750MHz and be used to transmit downlink data signal as marking off 5-42MHz.The upstream data passage just is meant that special division comes out to be used to transmit the frequency band of upstream data. signals, and the upstream data passage is called for short data feedback channel.Down going channel comprises downlink data channel and analog channel, and analog channel is used to transmit ordinary tv programme.Owing to use the directivity of amplifier in the CATV net, downlink information can be sent to each user node, and uplink information is quite different: the information that a certain user node sends by data feedback channel, and some user node can receive, and other user nodes then do not receive.We are one group of user node that can receive the uplink information that wherein arbitrary user node sends by data feedback channel and transmit the part that passage forms and call a branch, perhaps more generally, we regard the upstream data passage as shown in Figure 1 a kind of unidirectional tree structure, user node 102 is distributed in big little tree and props up, central control node 101 is positioned at the root of tree, when information transmitted on this single file passage, the node that is experienced can receive, and Jing Li node does not receive.As a kind of token of special control information, can be received by the node that is experienced equally.Therefore, in theory, user node not only can receive information and token from down going channel, and partly also can receive information and token from data feedback channel.
The purpose of this invention is to provide a kind of new MAC method based on CATV net realization integrated service, so that user node can receive token and/or information from data feedback channel, the distance of communication is shortened, thereby reduce time-delay, reduce the channel occupancy amount, improve the effective rate of utilization and the capacity of channel, and adopt this method to make up the CATV integrated services network, long with the token passing time that overcomes above-mentioned CATV integrated services network, shortcoming such as the channel effective rate of utilization is low.
For achieving the above object, the MAC method based on CATV net realization integrated service of the present invention, downlink information is pressed broadcast mode and is transmitted, and its main points are that uplink information adopts token tree mode to transmit.
Token tree mode can be a kind of in the following dual mode:
Mode one, token at first are sent to certain the last user node of branch one by one by down going channel, this user node can send data after receiving token, afterwards token is sent to a last user node of this branch by data feedback channel, last receives that the user node of token sends token to central control node by data feedback channel until this branch by that analogy, described central control node sends token the most last user node of next branch to by down going channel again ... circulation again again after token travels through all branches by that analogy.
Mode two, token only send those nodes that sends information possibly to, specifically comprise following key step:
(1), central control node asks to set up or revise the table (being called for short the token table later on) that relevant each branch sends the user node of information possibly and obtains the sequencing of token according to the user;
(2), central control node is by down going channel broadcasting token table;
(3), each user node transmits token by the order of the token table regulation of receiving, and send information when holding token.
Wherein the process of central control node foundation and modification token table comprises following key step:
(1), described central control node can be broadcasted user's service request inquiry frame at regular intervals;
(2), the user node of desire request service judges whether to send the service request frame after receiving this inquiry frame, if do not have, sends a service request frame by data feedback channel immediately, otherwise, wait for a period of time and send the service request frame again;
(3), central control node receives the service request frame, and sets up or revise the token table in view of the above.
The transmission of downlink information can not limited by token.
Another aspect of the present invention---realize a kind of integrated services network of above-mentioned MAC method, form by cable television network or its part, communication processor, modulator-demodulator, radio-frequency (RF) mixing and user's head joint equipment etc., it is characterized in that described communication processor and described modulator-demodulator constitute central control node described in the described MAC method, described communication processor broadcasting user service request inquiry frame, receive the service request frame, set up or revise the token table of each branch in view of the above, and broadcast this token table by modulator-demodulator and down going channel; Described user's head joint equipment and the computer that is attached thereto, telephone set or television set etc. constitute described user node, described user's head joint equipment receives user's service request inquiry frame, after receiving user's service request inquiry frame, send the service request frame when need sending data, send information when holding token and send token to next user's head joint equipment or communication processor by the order of token table regulation; Described radio-frequency (RF) mixing is with CATV signal and the mixing of downlink data channel signal and send described user node to, sends the data feedback channel signal to described modulator-demodulator.
Among the present invention, downlink information can comprise common broadcast TV programme, VOD program, video-game program, (computer) data, speech, merchandise news and other information on services etc.Except that the common broadcast TV programme, data and convertible or be encoded into compression VOD program, video-game program, speech, merchandise news and other information on services that data transmit and all can transmit by data channel.Uplink information can comprise data, speech and user command etc.Upstream data or convertible or be encoded into speech that data transmit and user command etc. and all can pass through the upstream data channel transfer.
Because the present invention makes full use of these characteristics of tree structure of CATV net, utilize data feedback channel partly to receive information and/or token, and only send token to node that those send information possibly, so shortened the transmitting range and the time of token and/or information, reduce the channel occupancy amount, improved the effective rate of utilization of channel.In addition, adopt the token mode, may command information transmission delay is realized real time business such as phone.
Below in conjunction with the description of drawings embodiments of the invention.In the accompanying drawing:
Fig. 1 is the schematic diagram of unidirectional tree structure for the explanation CATV passage of surfing the net;
Fig. 2 is the structural representation of a kind of token management table in the central control node in the MAC method of the present invention;
Fig. 3 A is the flow chart of an embodiment of MAC method of the present invention;
Fig. 3 B is the particular flow sheet of step S302 shown in Fig. 3 A;
Fig. 4 is the structural representation of first embodiment of CATV integrated services network of the present invention;
Fig. 5 is the structural representation of user's head joint equipment shown in Fig. 4;
Fig. 6 is the structural representation of second embodiment of CATV integrated services network of the present invention;
Fig. 7 is the structural representation of the 3rd embodiment of CATV integrated services network of the present invention.
Referring to Fig. 2, this illustrates the structural representation of a kind of token management table in the central control node in the MAC method of the present invention.As shown in Figure 2, described central control node is provided with a memory block, wherein a part is used for depositing whether the user node address (or numbering) and the residing state----thereof of each branch are the node that sends information possibly, this identifies by mark will, as indicating that with " * " this user node will send information, another part is deposited the pointer (being referred to as branch's pointer gauge) that points to each branch.When sending a certain branch token table, find the original position of respective branches user node by branch's pointer gauge, therefrom extract the user node that is equipped with " * " sign out and form a sequence, this sequence is exactly this branch token table of this moment.
Referring to Fig. 3 A, this illustrates the flow chart of an embodiment of MAC method of the present invention.Describe the key step of MAC method of the present invention in detail below in conjunction with this figure:
At first, token table in the central control node is initialized as sky (being that each user node does not all have " * " number sign) at step S301; Completing steps S302 in time t afterwards: service request login (will in Fig. 3 B, describe in detail); Enter step S303 then: the original position that a pointer F points to branch's pointer gauge shown in Fig. 2 is set; Enter the S304 step then: branch's pointer gauge that described central control node is pointed to by pointer F is determined the original position of respective branches user node, therefrom extract the user node that this branch is equipped with the information that sends possibly of " * " number sign out and form a sequence, the i.e. token table of this branch this moment, and broadcast token and token table simultaneously by down going channel, each user node receives the token table, and storage token table, be in the primary user node of token table and occupy token at this moment; Execution in step S305 afterwards: the user node of holding token sends a certain amount of information, and the information of token was received in storage in the storage device of oneself, and the expression of storage sent the information of service request frame before erasing; Enter step S306 subsequently: the node of holding token judges whether the information that needs send sends, as sending, then at step S307, this user node sends one and stops the service request frame, and the information of token was received in the expression of storage before erasing, described central control node receives above-mentioned termination service request frame, and changes the state (remove in its corresponding states hurdle " * " number) of this user node, enters step S308 then; On the other hand, be judged as "No" as S306 step, then directly enter step S308: the user node of holding token judges on the token table whether be empty (promptly whether no longer including the user node of the information that will send in this branch after this user node) behind this user node, as be judged as "No", execution in step S309: token is passed to a back user node, repeated execution of steps S305 then on the token table; Be judged as "Yes" as S308, execution in step S310 then: the user node of holding token is given described central control node with token, enter step S311 then: described central control node judges whether pointer F has pointed to the rearmost position of branch's pointer gauge, as be judged as "No", execution in step S312: the next position that pointer F points to branch's pointer gauge is set, then repeated execution of steps S304; Be judged as "Yes" as S311, then repeated execution of steps S302.
Fig. 3 B illustrates the idiographic flow of step S302 among Fig. 3 A: execution in step S321 at first: described central control node is broadcasted user's service request inquiry frame by down going channel, and described user node receives this inquiry frame; Enter step S322 then: described user node is inquired about last time this user node and whether was received token from the storage device of oneself, as receives, does not respond user's service request frame; Otherwise enter step S323: whether described user node is inquired about this user node has informational needs to send, and as the information that does not need to send, does not respond user's service request inquiry frame; Otherwise enter step S324: described user node is inquired about this user node and whether was sent user's claim frame last time, as is judged as "Yes", execution in step S325: wait for one section random time t ', enter step S326 then; Be judged as "No" as S324, then directly enter step S326: described user node sends the service request frame immediately, and store an expression and sent the information of service request frame, described central control node receives the service request frame, judge that whether it be one complete, correct service request frame, as be judged as "Yes", the state of the user node that changes the request service in the token table (in the status bar of this user node correspondence shown in Fig. 2, stamp " * " number), as be judged as "No", the claim frame that receives wrong (as clash etc.) is described, does not change the state of user node in the token table of request service.
Can be second embodiment of following change to MAC method as shown in Figure 3A: a clock timer is set in former step S302 as MAC method of the present invention, set a time period T simultaneously, and according to the channel effective rate of utilization, up channel transmission rate and user node send the speed of data and determine to allow login service requesting users interstitial content and the each amount of information that sends of each node behind each broadcasting user service request inquiry frame, to guarantee after former step S311 judges oneself sensing branch pointer gauge tail of pointer F, whole systemic circulation process (comprises the service request login, transmit token, transmission information etc.) time spent is no more than period T, and isochronon express time period T then re-executes step S302 again.
Need illustrate that time t described in this method step S302 sets according to propagation delay time and personal attendant's machine stand-by period, period of time T described in the embodiment two is according to settings such as the effective rate of utilization of channel, described time t and token passing times.For example: described central control node is no more than 300km to the described user node of each branch's least significant end apart from sum, be no more than 75km with the ultimate range of user node, upstream data rate is about 10Mbps, simultaneously provide real time business and other non real-time services such as plain old telephone to 100 users, can set T=20ms, t=1ms; And for example: described central control node is no more than 30km to the described user node of each branch's least significant end apart from sum, be no more than 1.5km with the ultimate range of user node, upstream data rate is about 10Mbps, simultaneously provide real time business and other non real-time services such as plain old telephone to 80 users, can set T=3ms, t=0.02ms.
Referring to Fig. 4, this illustrates the structural representation of CATV integrated services network first embodiment of the present invention.By this figure as seen, this integrated services network mainly comprises CATV net or its part, communication processor (CP) 401, modulator-demodulator (M) 402, radio-frequency (RF) mixing 403, sub-headend 404, distributing center 405, user's head joint equipment 406 and subscriber equipment such as telephone set/facsimile machine 407, computer 408, television set 409 etc.Communication processor 401, modulator-demodulator 402, radio-frequency (RF) mixing 403 and sub-headend 404 link to each other successively, described sub-headend links to each other with several described distributing centers 405, distributing center can connect several described user's head joint equipments 406, and described user's head joint equipment is connected to particular user equipment such as telephone set or facsimile machine, television set, computer etc.Described communication processor 401 broadcasting user service requests inquiry frame receives the service request frame, according to its foundation or revise the token table and with token and token table by described modulator-demodulator 402 and down going channel broadcasting; Described user's head joint equipment 406 receives service request inquiry frame, after receiving user's service request inquiry frame, send the service request frame when needing transmission information, when token passes to this head joint equipment by the order of token table regulation, send information, and send token to next user's head joint equipment by the order of the token table regulation of receiving to up channel; Described radio-frequency (RF) mixing 403 is with CATV signal and the mixing of downlink data channel signal and send described user node to, sends the data feedback channel signal to described modulator-demodulator 402.
Referring to Fig. 5, this illustrates the structural representation of the head joint equipment of user shown in Fig. 4.As seen from Figure 5, described user's head joint equipment mainly comprises modulator-demodulator 501, receiver 502, transmitter 503, microprocessor 504, clock circuit 505, memory 506, up reception table 507 and function card 508.Each parts is worked under the control of described microprocessor 504 and clock signal.Described modulator-demodulator 501 can be modulated the uplink information of need transmission and the descending and uplink information that demodulation is received.Shift register and buffering register are arranged in described receiver 502 and the transmitter 503, be transformed into parallel signal and temporary, deliver to described memory 506 by bus then receiving the serial signal of coming in; Will be temporary during transmission from the parallel signal of memory, be transformed into serial signal and send.The token table that receives from down going channel and leave memory earlier in from the token that down going channel or data feedback channel receive, send data (if having data to send) after, send token on the token table next user's head joint equipment by data feedback channel again.Described up reception table 507 is deposited the user node address that can receive the information of this user node transmission by data feedback channel, if information will send to these nodes, then can directly send to by data feedback channel; Otherwise deliver to central control node, transmit by central control node.Described function card 508 can be compunication card, telephone interface card, video display decompress(ion) card or other function card, described user's head joint equipment can install any, two kinds or whole described function card.
Referring to Fig. 6, this illustrates the structural representation of second embodiment of CATV integrated services network of the present invention.The communication processor (CP) 601, (CP) 602 that have two nothings to contact directly in this integrated services network, can be that central control node makes up integrated services network (service network 1, service network 2) as shown in Figure 4 with each communication processor, but the CATV signal in the service network 2 be provided by service network 1.The downlink information of CP601 broadcasting and CATV signal are given radio-frequency separator 609 by sub-headend 608 after radio-frequency (RF) mixing 606 is mixed, radio-frequency separator 609 is therefrom isolated the CATV signal and is given the radio-frequency (RF) mixing 607 that links to each other with communication processor 602 by modulator-demodulator 605, radio-frequency (RF) mixing 607 with the CATV signal be transferred to distributing center 611 after downlink data signal from CP602 mixes.CP602 sends data through radio-frequency separator 609 to the upstream data passage of service network 1 by modulator-demodulator 604.If communication processor 602 directly links to each other with communication processor 601, then modulator-demodulator 604 can take down.
Referring to Fig. 7, this illustrates the structural representation of the 3rd embodiment of CATV integrated services network of the present invention.This integrated services network and aforementioned two embodiment differences only have been a plurality of described communication processors 701, and each described communication processor links to each other by optical cable, realize intercommunication mutually.Described communication processor 701 also links to each other with Internet server 702, VOD center 703 and merchandise news center 704 etc., thereby realizes services such as Internet visit, VOD and TV shopping.Described communication processor links to each other with public network 706 (as public telephone network, ISDN, Packet Switch Data Network, Digital Data Net etc.) by public network interface equipment 705, realizes services such as toll telephone, telecommunication.Described communication processor also links to each other with Ethernet Ethernet708 by router 707.
More than though the present invention has been described in conjunction with the embodiments, but obviously protection range of the present invention is not limited to this, those skilled in the art also may make all conspicuous changes, for example: among integrated services network the 3rd embodiment of the present invention, 701 of described communication processors also can pass through coaxial cable, ATM switching network or other communication medium and link to each other; Described communication processor 701 can be only with Internet server 702, VOD center 703, merchandise news center 704, public network 706 and Ethernet 708 in one or more linking to each other; Or the like.Therefore protection scope of the present invention is only determined by claims.
Claims (10)
1. the medium based on cable television network realization integrated service send and gets control method, and downlink information is pressed broadcast mode and transmitted, and it is characterized in that uplink information adopts token tree mode to transmit.
2. medium as claimed in claim 1 send gets control method, it is characterized in that token only sends the node that those send information possibly to, specifically comprises following key step:
(1) central control node (101) asks to set up or revise the table (being called for short the token table later on) that relevant each branch sends the user node (102) of information possibly and obtains the sequencing of token according to the user;
(2) central control node (101) is by down going channel broadcasting token table;
(3) each user node (102) transmits token by the order of the token table regulation of receiving, and sends information when holding token.
3. medium as claimed in claim 2 send access method, it is characterized in that the step of described foundation or modification token table comprises following key step:
(1) described central control node (101) can be broadcasted user's service request inquiry frame at regular intervals;
(2) judge whether to send the service request frame after the user node (102) of desire request service receives this inquiry frame,, send a service request frame by data feedback channel immediately if do not have, otherwise, wait for a period of time and send the service request frame again;
(3) central control node receives the service request frame, and sets up or revise the token table in view of the above.
4. send access method as claim 2 or 3 described media, it is characterized in that described central control node is no more than 300km to the described user node of each branch's least significant end apart from sum, ultimate range between described central control node and the described user node is no more than 75km, upstream data rate is about 10Mbps, at most can be simultaneously for 100 users provide service, about 20ms of the time interval of described central control node broadcasting user service request inquiry frame.
5. send access method as claim 2 or 3 described media, it is characterized in that described central control node is no more than 30km to the described user node of each branch's least significant end apart from sum, ultimate range between described central control node and the described user node is no more than 1.5km, upstream data rate is about 10Mbps, at most can be simultaneously for 80 described user nodes provide service, about 3ms of the time interval of described central control node broadcasting user service request inquiry frame.
6. realize integrated services network based on CATV net for one kind as method as described in claim 2 or 3, comprise cable television network or its part, communication processor (401,601,602,701), modulator-demodulator (402,603,604,605), radio-frequency (RF) mixing (403,606,607) and user's head joint equipment (406,612,613), it is characterized in that described communication processor and described modulator-demodulator constitute described central control node (101), described communication processor broadcasting user service request inquiry frame receives the service request frame, set up or revise the token table of each branch in view of the above, and broadcast this token table by modulator-demodulator and down going channel; Described user's head joint equipment and the computer that is attached thereto, telephone set or television set etc. constitute described user node (102), described user's head joint equipment receives user's service request inquiry frame, after receiving user's service request inquiry frame, send the service request frame when need sending data, send information when holding token and send token to next user's head joint equipment or communication processor by the order of token table regulation; Described radio-frequency (RF) mixing is with CATV signal and the mixing of downlink data channel signal and send described user node to, sends the data feedback channel signal to described modulator-demodulator.
7. integrated services network as claimed in claim 6, it is characterized in that each communication processor (701) links to each other by optical cable, coaxial cable or other communication medium or links to each other by the ATM switching network, can intercom mutually, described communication processor (701) also links to each other with Internet server (702), VOD center (703) or merchandise news center (704) etc., thereby realizes services such as Internet visit, VOD or TV shopping.
8. integrated services network as claimed in claim 6 is characterized in that described communication processor (701) is connected with public network (706) by public network interface equipment (705), thereby realizes services such as toll telephone, telecommunication.
9. integrated services network as claimed in claim 6, it is characterized in that described user's head joint equipment (406,612,613) form by modulator-demodulator (501), receiver (502), transmitter (503), microprocessor (504), clock circuit (505), memory (506), up reception table (507) and function card (508) etc.
10. integrated services network as claimed in claim 9, it is characterized in that described memory (506) storage is transformed into the information that data, token, token table and this head joint equipment of parallel signal will send through receiver (502), described function card (508) is Computer Communications Interface card, telephone interface card, video display decompress(ion) card or other function card, user's head joint equipment can install any, two kinds or repertoire card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96119179A CN1062100C (en) | 1996-11-02 | 1996-11-02 | CATV-based medium transmitting control method and network for realizing comprehesive business |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96119179A CN1062100C (en) | 1996-11-02 | 1996-11-02 | CATV-based medium transmitting control method and network for realizing comprehesive business |
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| CN1181671A true CN1181671A (en) | 1998-05-13 |
| CN1062100C CN1062100C (en) | 2001-02-14 |
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| CN96119179A Expired - Fee Related CN1062100C (en) | 1996-11-02 | 1996-11-02 | CATV-based medium transmitting control method and network for realizing comprehesive business |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101193043B (en) * | 2006-12-01 | 2012-02-15 | 北京东方广视科技股份有限公司 | A method for realizing data back transfer in CATV network |
| US8705567B2 (en) | 2004-12-10 | 2014-04-22 | Broadcom Corporation | Upstream channel bonding using legacy maps in a cable communications system |
| US8711878B2 (en) | 2004-12-10 | 2014-04-29 | Broadcom Corporation | Upstream channel bonding in a cable communications system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4567433B2 (en) * | 2004-12-27 | 2010-10-20 | ルネサスエレクトロニクス株式会社 | Host apparatus, device apparatus, communication system, and data transmission / reception method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2146315T3 (en) * | 1994-06-09 | 2000-08-01 | Koninkl Philips Electronics Nv | A MULTIPLE ACCESS BIDIRECTIONAL COMMUNICATION SYSTEM, AND A CENTRAL STATION AND A USER STATION FOR USE IN SUCH SYSTEM. |
| US5528582A (en) * | 1994-07-29 | 1996-06-18 | At&T Corp. | Network apparatus and method for providing two way broadband communications |
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1996
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8705567B2 (en) | 2004-12-10 | 2014-04-22 | Broadcom Corporation | Upstream channel bonding using legacy maps in a cable communications system |
| US8711878B2 (en) | 2004-12-10 | 2014-04-29 | Broadcom Corporation | Upstream channel bonding in a cable communications system |
| US8908716B2 (en) | 2004-12-10 | 2014-12-09 | Broadcom Corporation | Upstream channel bonding in a cable communications system |
| CN101193043B (en) * | 2006-12-01 | 2012-02-15 | 北京东方广视科技股份有限公司 | A method for realizing data back transfer in CATV network |
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