CN104079956A - User terminal access control method and access control equipment - Google Patents
User terminal access control method and access control equipment Download PDFInfo
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Abstract
The invention provides a user terminal access control method. The method comprises the following steps: receiving a request on a channel from a user terminal; determining whether the user terminal is a high-priority user terminal or not based on user monitoring and counting information; if the user terminal is the high-priority user terminal, permitting transmitting at least one multicast I frame of the requested channel to the user terminal in a unicast way; and if the user terminal is not the high-priority user terminal, forbidding transmitting at least one multicast I frame of the requested channel to the user terminal in the unicast way. The invention further provides access control equipment for implementing the user terminal access control method. Based on the technical scheme of the invention, the network bandwidth demand of a fast channel change mechanism (such as FCC) at peak hours (particularly commercial breaks) can be effectively lowered. Meanwhile, the scalability of the type of fast channel change mechanism is effectively enhanced.
Description
Technical field
The present invention relates to network television system, particularly, relate to a kind of user terminal access control method and the access control equipment of realizing the method that switches bandwidth demand for reducing IPTV (internet protocol TV) fast channel.
Background technology
Fig. 1 shows the block diagram of a traditional IPTV transmission network 100.As shown in Figure 1, traditional IPTV transmission network 100 comprises video source office (VHO) 1100, channel switching server (CCS) 1200, access point (AN) 1300, Set Top Box/TV (STB/TV) (user terminal) 1400.Fig. 1 is only example, and the quantity of each assembly wherein is not imposed any restrictions.VHO1100 is connected with AN1300 by transmission network 1900 with CCS1200.AN1300 is connected with STB/TV1400.
Conventionally,, compared with tradition (wired) television system, a topmost deficiency of IPTV is that IPTV has longer channel change delay.The service experience (QoE) that this may greatly reduce user, causes customer loss, and causes IPTV service provider's revenue decline.
User channel switching delay (Channel Change Delay, CCD) refers to the moment of sending from a channel change command (passing through remote controller) and plays the time delay till requested television channel is finally presented at video screen.This time delay is mainly made up of following components:
Based on above data, I frame obtains time delay that wait brings shared proportion maximum in all factors.In current IPTV system, total time delay is about 1～2 second, applies after encoding and decoding compress technique of future generation in future, and total time delay may reach 5～10 seconds.
In order to improve compression of digital video efficiency, nearly all coding and decoding video mechanism (as: MPEG-1 or MPEG-2) has all adopted non-uniform encoding method.Particularly, video flowing is encoded as a series of self-demarking code frames (I frame) and MB of prediction frame (P frame or B frame).Although the decoding of I frame does not rely on other any frames, the decoding of P frame or B frame but needs to rely on other frames.Therefore generally, the size of I frame will be much larger than P frame or B frame.
On the one hand, for realizing an efficient video compression algorithm, the frequency that I frame occurs in video flowing is the smaller the better; On the other hand, if the frequency too low (that is to say that two time intervals between adjacent I frame are oversize) that I frame occurs is required also just longer for receiving the time that the next I frame of target channel waits in the time of user's switching channels.This is because in the time that user is at a time switched to a certain television channel j, and from the position of the corresponding frame of video of current time, next I frame is backward first frame of video that can be successfully decoded and show.Therefore, we need a kind of good balance to process this to contradiction.
In recent years, a large amount of research concentrates on to improve the channel switching acceleration mechanism that user experience quality (QoE) is target.Wherein, the fast channel that proposed by Microsoft switches (Fast Channel Change, FCC) method in current application the most extensively and the most effective.FCC side's ratio juris is: system is asked after a channel user, transmit in its buffer memory from the corresponding frame of video of current time nearest (having transmitted in Multicast Flows) I frame forward to this user (acceleration) by mode of unicast immediately, thereby reduce user and wait for time of first decodable code frame in channel handoff procedure.
But channel handover event is normally associated, and be aligned in program broadcast timetable.Particularly, in the time that a program finishes (or ad break), a large number of users tends to carry out at short notice continuous fast channel and browses to search interested program.On the other hand, because the program broadcasting time of each television channel is normally alignd, as: the program end time (or ad break time started) of different channel is all in every whole least bit moment conventionally.Therefore, periodically increase and outburst at double in the of short duration period after those moment of the quantity of channel handover event.Being multiplied and breaking out for existing FCC method in this short time caused very large restriction.Because in FCC method, channel switching server (CCS) the 1200th, carries out channel and switches the entity accelerating, also be the source that stream is accelerated in all clean cultures (I frame), in the time that channel switch request is multiplied and break out, systematic function is mainly limited to following two factors:
factor 1: the throughput (as: I/O throughput) of channel switching server (CCS)
factor 2:IPTV Access Network bandwidth (that is: the link bandwidth between CCS and IPTV user)
About above-mentioned two kinds of system capacity requirements all by the quantity growth along with user channel request and linear increasing.Conventionally, can by use more powerful hard/software platform (as: group system) promotes the capacity (factor 1) of channel switching server.It is easily a lot of that this dilatation with respect to Access Network link bandwidth (factor 2) is wanted.
Therefore, be necessary a kind of user terminal access control method and realize the access control equipment of the method, for reducing its in peak period (peak-hour) demand to the network bandwidth, thereby improve this type of channel and switch the retractility of accelerated method.
Summary of the invention
The present invention proposes a kind of user terminal access control method and the access control equipment of realizing the method that switches bandwidth demand for reducing IPTV (internet protocol TV) fast channel.
According to the first scheme of the present invention, a kind of user terminal access control method has been proposed, comprising: receive the request to channel from user terminal; Monitor and statistical information based on user, determine whether described user terminal is high-priority users terminal; If determine that described user terminal is high-priority users terminal, at least one that allows to transmit the channel of asking to described user terminal clean culture I frame of multicast; And if determine that described user terminal is not high-priority users terminal, at least one that refuse to transmit the channel of asking to described user terminal clean culture I frame of multicast.
According to alternative plan of the present invention, a kind of access control equipment has been proposed, comprising: receiving element, for receiving the request to channel from user terminal; Control unit, for based on user monitoring and statistical information determine whether described user terminal is high-priority users terminal, and result based on definite, control the clean culture transmission of data to user terminal; And clean culture delivery unit, for transmitting data to user terminal clean culture; Wherein, be high-priority users terminal if described control unit is determined described user terminal, at least one of the channel that described control unit allows described clean culture delivery unit to transmit to described user terminal clean culture to ask I frame of multicast; And
If it is not high-priority users terminal that described control unit is determined described user terminal, at least one of the channel that described control unit does not allow described clean culture delivery unit to transmit to described user terminal clean culture to ask I frame of multicast.
According to some embodiments of the present invention, described I frame is self-demarking code frame.
According to other embodiment of the present invention, channel browsing mode record based on described user terminal, calculate on average browsing the time of staying of described user terminal, the time that wherein described user terminal is received to a certain channel is less than watches the channel browsing pattern that the mode record of threshold value is described user terminal, is recorded as to the channel browsing time of staying of this channel browsing pattern of described user terminal the described time; If the time of staying of on average browsing of described user terminal is not less than classification thresholds, described user terminal is defined as to high-priority users terminal; If the time of staying of on average browsing of described user terminal is less than classification thresholds, described user terminal is defined as to low priority user terminal.
That for example, can calculate user terminal i according to following formula on average browses time of staying T
i:
Wherein Z
i, jrepresent the channel browsing time of staying of the nearest the j time channel browsing pattern of user terminal i, 1≤j≤N, N represents the channel browsing mode record number of times upper limit setting in advance, α represents the channel browsing time of staying Z of the last channel browsing pattern of user terminal
i, 1weight, 0≤α≤1.
Further, in the time that recorded channel browsing mode record frequency n is less than N, that can calculate user terminal i according to following formula on average browses time of staying T
i:
Preferably, described classification thresholds is dynamically determine or upgrade.For example, can calculate described classification thresholds T according to following formula
thd:
Wherein I represents the sum of current active user terminal, T
irepresent on average browsing the time of staying of user terminal i.
Based on technique scheme of the present invention, can effectively reduce the network bandwidth requirements of fast channel handover mechanism (as: FCC) at peak time (particularly ad break), meanwhile, effectively strengthen the scalability of this type of fast channel handover mechanism.
Brief description of the drawings
By below in conjunction with brief description of the drawings the preferred embodiments of the present invention, will make of the present invention above-mentioned and other objects, features and advantages are clearer, wherein:
Fig. 1 shows the block diagram of a traditional IPTV transmission network 100.
Fig. 2 shows according to the block diagram of the IPTV transmission network 200 of illustrated embodiments of the invention.
Fig. 3 shows for illustrating and on average browses time of staying T
ithe schematic diagram of example calculations method.
Fig. 4 shows according to the block diagram of the access control equipment 2500 of illustrated embodiments of the invention.
Fig. 5 shows according to the flow chart of the connection control method 500 of illustrated embodiments of the invention.
In institute of the present invention drawings attached, same or analogous structure and step are all with same or analogous designated.
Embodiment
To a preferred embodiment of the present invention will be described in detail, in description process, having omitted is unnecessary details and function for the present invention with reference to the accompanying drawings, obscures to prevent that the understanding of the present invention from causing.
First, technical term as used in this specification is described.
channel switches acceleration CCA, Channel Change Acceleration
channel handoff delay CCD, Channel Change Delay
fast channel switches FCC, Fast Channel Change;
Similarly concept also comprises: Instant Channel Change
fast browsing pattern Zapping Mode
User is the browse mode of fast switching channels at short notice
watching mode Viewing Mode
User relatively long a period of time (as, be greater than 5 minutes) in continue to watch same channel pattern
the MPEG of Motion Picture Experts Group, Moving Picture Experts Group
image sets GOP, Group of pictures
Be generally I frame, P frame and a B frame sequence with ad hoc structure
intracoded frame (self-demarking code frame) I-frame, Intra-coded frame
mB of prediction frame P-frame, Predicted frame
bidirectional interframe predictive frame B-frame, Bi-predictive frame
channel switching server CCS, Channel Change Server
service experience quality Q oE, Quality of Experience
internet protocol TV IPTV, Internet Protocol Television
Fig. 2 shows according to the block diagram of the IPTV transmission network 200 of illustrated embodiments of the invention.As shown in Figure 2, IPTV transmission network 200 comprises video source office (VHO) 2100, channel switching server (CCS) 2200, access point (AN) 2300, Set Top Box/TV (STB/TV) (user terminal) 2400.Fig. 2 is only example, and the quantity of each assembly wherein is not imposed any restrictions.VHO2100 is connected with AN2300 by transmission network 2900 with CCS2200.AN2300 is connected with STB/TV2400.IPTV transmission network 200 also comprises access control equipment (ACM) 2500 and monitors statistics equipment (MSM) 2600.In a concrete realization, access point (AN) 2300 can be realized by Digital Subscriber Line Access Multiplexer (DSLAM).
As shown in Figure 2, ACM2500 is for the transmission (multicast or clean culture) on each AN2300 of 2900 from CCS2200 to transmission network of the video data of controlling all television channels.In a concrete realization, ACM2500 can realize on CCS2200.
MSM2600 is for the behavior (as: fast channel is browsed) of supervisory user switching channels, and the channel browsing pattern of recording user.In a concrete realization, MSM2600 can realize on CCS2200.In the example shown in Fig. 2, ACM2500 and MSM2600 are embodied as different equipment, but the present invention is not limited thereto, also ACM2500 and MSM2600 (for example can be embodied as to single equipment, as being described in detail with reference to Fig. 4 after a while, carried out all functions of MSM2600 by the control unit 2530 in ACM2500), or can be integrated in CCS2200.
For example, in one embodiment, MSM2600 can receive user terminal i the time Z of a certain channel
i, jthe mode record of (watching threshold value) is a channel browsing pattern of this user terminal i to be less than 5 minutes, is recorded as to the channel browsing time of staying Z of this channel browsing pattern of this user terminal i the described time
i, j.For example, MSM2600 can nearest N the channel browsing pattern of recording user terminal i, that is, 1≤j≤N, forms the channel browsing mode record matrix { Z of user terminal i
i, N, Z
i, N-1..., Z
i, 2, Z
i, 1.
MSM2600 can be based on user terminal i channel browsing mode record matrix { Z
i, N, Z
i, N-1..., Z
i, 2, Z
i, 1, that calculates user terminal i on average browses time of staying T
i.That for example, can calculate user terminal i according to following formula (1) on average browses time of staying T
i:
In formula (1), be the channel browsing time of staying Z of the last channel browsing pattern of user terminal i
i, 1give weight α, 0≤α≤1.
Again for example, be less than the user terminal i of N for recorded channel browsing mode record frequency n, that can calculate user terminal i according to following formula (2) on average browses time of staying T
i:
Fig. 3 shows for illustrating and on average browses time of staying T
ithe schematic diagram of example calculations method.In the example depicted in fig. 3, get and watch threshold value=5 minute (300 seconds), N=5, α=0.2, it should be noted that watching the value of threshold value, N and α is only example, also can choose according to the setting of system the numerical value of other any appropriate.
As shown in (a) in Fig. 3, show successive channel browse mode, nearest N the channel of user terminal i switches all in channel browsing pattern, and therefore, this N time channel switches the channel browsing mode record matrix { Z that is all recorded in user terminal i in channel browsing pattern recently
i, N, Z
i, N-1..., Z
i, 2, Z
i, 1in, that calculates user terminal i according to formula (1) on average browses time of staying T
i:
T
i＝0.2×4+(1-0.2)×[(4+7+3+3)/(5-1)]＝4.2s。
As shown in (b) in Fig. 3, show the discontinuous channel browsing pattern that comprises watching mode, in the time of nearest N the channel browsing pattern of recording user terminal i, get rid of the watching mode (dash area in figure) of user terminal i, form the channel browsing mode record matrix { Z of user terminal i
i, N, Z
i, N-1..., Z
i, 2, Z
i, 1, that calculates user terminal i according to formula (1) on average browses time of staying T
i:
T
i＝0.2×4+(1-0.2)×[(8+4+3+3)/(5-1)]＝4.4s。
As shown in (c) in Fig. 3, (for example show situation that recorded channel browsing mode record frequency n=3 are less than N=5, user terminal i just starts shooting), due to data volume deficiency, be only recorded to the channel browsing mode record matrix { Z of user terminal i
i, n, Z
i, n-1..., Z
i, 2, Z
i, 1, that calculates user terminal i according to formula (2) on average browses time of staying T
i:
T
i＝(4+3+3)/3＝3.33s。
What in addition, MSM2600 can also be based on all user terminals on average browses time of staying T
icalculate classification thresholds T
thdthereby ACM2500 can be based on classification thresholds T
thd, user terminal is divided into high-priority users terminal and low priority user terminal two classes.For example, can calculate classification thresholds T according to following formula (3)
thd:
Wherein I represents the sum of current active user terminal, T
irepresent on average browsing the time of staying of user terminal i.ACM2500 can will on average browse time of staying T
ibe not less than T
thduser terminal i be defined as high-priority users terminal; Otherwise, will on average browse time of staying T
ibe less than T
thduser terminal i be defined as low priority user terminal.Still, taking situation shown in Fig. 3 as example, suppose that (a), (b), (c) represent respectively three different user terminals, according to formula (3), classification thresholds T
thd=(4.2+4.4+3.33)/3=3.98s.Thus, can by (a) and (b) represented user terminal be defined as high-priority users terminal, and user terminal represented to (c) is defined as to low priority user terminal.
In addition, classification thresholds T
thdalso can obtain by the mode of non-calculating, for example, can be pre-determined by service provider.In addition classification thresholds T,
thdcan be (for example, redefine or upgrade once every the scheduled time) dynamically determining or upgrade.Again for example, classification thresholds T
thdrenewal can be based on user terminal the arrival intensity (sum of the channel request for example, arriving in every 15 minutes) of channel request.In this case, in the time that the arrival intensity of the channel request from all user terminals is greater than scheduled update threshold value, upgrade classification thresholds T
thd; On the contrary, in the time that the arrival intensity of the channel request from all user terminals is not more than scheduled update threshold value, keep classification thresholds T
thdconstant.
Fig. 4 further shows according to the block diagram of the access control equipment 2500 of illustrated embodiments of the invention.As shown in Figure 4, access control equipment (ACM) 2500 can comprise receiving element 2510, clean culture delivery unit 2520 and control unit 2530.
Receiving element 2510 receives the request to channel from user terminal (STB/TV2400).Clean culture delivery unit 2520 transmits data to user terminal (STB/TV2400) clean culture.Control unit 2530 for based on user monitor and statistical information (for example, from MSM2600 or monitor voluntarily, add up generation), determine whether described user terminal is high-priority users terminal, and result based on definite, the clean culture transmission of data to user terminal controlled.
The control unit 2530 of clean culture transfer control about to(for) data, can adopt various ways.Below with reference to Fig. 5, transfer control specific embodiment is described in detail.
Fig. 5 shows according to the flow chart of the connection control method 500 of illustrated embodiments of the invention.Connection control method shown in should be appreciated that is only example, and the present invention is not limited to this concrete processing mode.
With reference to figure 5, at step S510, receiving element 2510 receives the request to channel a from user terminal (STB/TV2400).At step S520, control unit 2530 based on from MSM2600 or monitor voluntarily, add up generation user monitor and statistical information, determine whether described user terminal is high-priority users terminal.If control unit 2530 determines that described user terminal is high-priority users terminal (step S520: be), at step S530, at least one of the channel a that control unit 2530 allows clean culture delivery unit 2520 to transmit to described user terminal clean culture to ask I frame of multicast.Otherwise, if control unit 2530 determines that described user terminal is not high-priority users terminal (step S520: no), at step S540, at least one of the channel a that control unit 2530 does not allow clean culture delivery unit 2520 to transmit to described user terminal clean culture to ask I frame of multicast.
For example, for step S520, control unit 2530 can adopt as above user terminal is first calculated in the described formula of MSM2600 (1) or (2) on average browse time of staying T
i, then, calculate classification thresholds T based on above-mentioned formula (3)
thd, last, then based on the calculated time of staying T that on average browses
iwith classification thresholds T
thdbetween comparison, determine whether described user terminal is high-priority users terminal.For example, can time of staying T will on average be browsed
ibe not less than T
thduser terminal i be defined as high-priority users terminal; Otherwise, will on average browse time of staying T
ibe less than T
thduser terminal i be defined as low priority user terminal.
In addition, classification thresholds T
thdalso can obtain by the mode of non-calculating, for example, can be pre-determined by service provider.In addition classification thresholds T,
thdcan be (for example, redefine or upgrade once every the scheduled time) dynamically determining or upgrade.Again for example, classification thresholds T
thdrenewal can be based on user terminal the arrival intensity (sum of the channel request for example, arriving in every 15 minutes) of channel request.In this case, in the time that the arrival intensity of the channel request from all user terminals is greater than scheduled update threshold value, upgrade classification thresholds T
thd; On the contrary, in the time that the arrival intensity of the channel request from all user terminals is not more than scheduled update threshold value, keep classification thresholds T
thdconstant.
Other settings of the embodiment of the present invention disclosed herein comprise the step of embodiment of the method and the software program of operation that execution is formerly summarized and describe in detail subsequently.More specifically, computer program is following a kind of embodiment: have computer-readable medium, on computer-readable medium, coding has computer program logic, in the time carrying out on computing equipment, computer program logic provides relevant operation, thereby above-mentioned user terminal access control scheme is provided.In the time carrying out at least one processor at computing system, computer program logic makes the operation (method) described in the processor execution embodiment of the present invention.This set of the present invention is typically provided as the software, code and/or other data structures that such as arrange or be coded in, on the computer-readable medium of such as light medium (CD-ROM), floppy disk or hard disk etc. or such as Downloadable software image, shared data bank etc. in other media or application-specific integrated circuit (ASIC) (ASIC) or one or more module of the firmware on one or more ROM or RAM or PROM chip or microcode.Software or firmware or this configuration can be arranged on computing equipment, so that obtain the technology described in the one or more processors execution embodiment of the present invention in computing equipment.Also can provide according to node of the present invention and main frame in conjunction with the software process operating such as the computing equipment in one group of data communications equipment or other entities.Also can be distributed between all software process that move on multiple software process in multiple data communications equipment or all software process that move on one group of small, dedicated computer or single computer according to node of the present invention and main frame.
Should be appreciated that, strictly say, embodiments of the invention can be implemented as software program on data processing equipment, software and hardware or independent software and/or independent circuit.
So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that, those skilled in the art without departing from the spirit and scope of the present invention, can carry out various other change, replacement and interpolations.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (14)
1. a user terminal access control method, comprising:
Receive the request to channel from user terminal;
Monitor and statistical information based on user, determine whether described user terminal is high-priority users terminal;
If determine that described user terminal is high-priority users terminal, at least one that allows to transmit the channel of asking to described user terminal clean culture I frame of multicast; And
If determine that described user terminal is not high-priority users terminal, at least one that refuse to transmit the channel of asking to described user terminal clean culture I frame of multicast.
2. user terminal access control method according to claim 1, wherein, described I frame is self-demarking code frame.
3. user terminal access control method according to claim 1, wherein, monitors and statistical information based on user, determines that whether described user terminal is that the step of high-priority users terminal comprises:
Channel browsing mode record based on described user terminal, calculate on average browsing the time of staying of described user terminal, the time that wherein described user terminal is received to a certain channel is less than watches the channel browsing pattern that the mode record of threshold value is described user terminal, is recorded as to the channel browsing time of staying of this channel browsing pattern of described user terminal the described time;
If the time of staying of on average browsing of described user terminal is not less than classification thresholds, described user terminal is defined as to high-priority users terminal;
If the time of staying of on average browsing of described user terminal is less than classification thresholds, described user terminal is defined as to low priority user terminal.
4. user terminal access control method according to claim 3, wherein, that calculates user terminal i according to following formula on average browses time of staying T
i:
Wherein Z
i, jrepresent the channel browsing time of staying of the nearest the j time channel browsing pattern of user terminal i, 1≤j≤N, N represents the channel browsing mode record number of times upper limit setting in advance, α represents the channel browsing time of staying Z of the last channel browsing pattern of user terminal
i, 1weight, 0≤α≤1.
5. user terminal access control method according to claim 4, wherein, in the time that recorded channel browsing mode record frequency n is less than N, that calculates user terminal i according to following formula on average browses time of staying T
i:
6. according to the user terminal access control method one of claim 3～5 Suo Shu, wherein, described classification thresholds is dynamically determine or upgrade.
7. user terminal access control method according to claim 6, wherein, calculates described classification thresholds T according to following formula
thd:
Wherein I represents the sum of current active user terminal, T
irepresent on average browsing the time of staying of user terminal i.
8. an access control equipment, comprising:
Receiving element, for receiving the request to channel from user terminal;
Control unit, for based on user monitoring and statistical information determine whether described user terminal is high-priority users terminal, and result based on definite, control the clean culture transmission of data to user terminal; And
Clean culture delivery unit, for transmitting data to user terminal clean culture;
Wherein, be high-priority users terminal if described control unit is determined described user terminal, at least one of the channel that described control unit allows described clean culture delivery unit to transmit to described user terminal clean culture to ask I frame of multicast; And
If it is not high-priority users terminal that described control unit is determined described user terminal, at least one of the channel that described control unit does not allow described clean culture delivery unit to transmit to described user terminal clean culture to ask I frame of multicast.
9. access control equipment according to claim 8, wherein, described I frame is self-demarking code frame.
10. access control equipment according to claim 8, wherein, described control unit:
Channel browsing mode record based on described user terminal, calculate on average browsing the time of staying of described user terminal, the time that wherein described user terminal is received to a certain channel is less than watches the channel browsing pattern that the mode record of threshold value is described user terminal, is recorded as to the channel browsing time of staying of this channel browsing pattern of described user terminal the described time;
If the time of staying of on average browsing of described user terminal is not less than classification thresholds, described user terminal is defined as to high-priority users terminal;
If the time of staying of on average browsing of described user terminal is less than classification thresholds, described user terminal is defined as to low priority user terminal.
11. access control equipments according to claim 10, wherein, what described control unit calculated user terminal i according to following formula on average browses time of staying T
i:
Wherein Z
i, jrepresent the channel browsing time of staying of the nearest the j time channel browsing pattern of user terminal i, 1≤j≤N, N represents the channel browsing mode record number of times upper limit setting in advance, α represents the channel browsing time of staying Z of the last channel browsing pattern of user terminal
i, 1weight, 0≤α≤1.
12. access control equipments according to claim 11, wherein, in the time that recorded channel browsing mode record frequency n is less than N, what described control unit calculated user terminal i according to following formula on average browses time of staying T
i:
13. according to the access control equipment one of claim 10～12 Suo Shu, and wherein, described classification thresholds is dynamically determine or upgrade.
14. access control equipments according to claim 13, wherein, described control unit calculates described classification thresholds T according to following formula
thd:
Wherein I represents the sum of current active user terminal, T
irepresent on average browsing the time of staying of user terminal i.
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| CN102231849A (en) * | 2011-06-17 | 2011-11-02 | 广州珠江数码集团有限公司 | Digital television video on demand system and on demand method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110087105A (en) * | 2018-01-25 | 2019-08-02 | 华为技术有限公司 | A kind of IPTV multicast turns the switching method and device of unicast |
| CN110087105B (en) * | 2018-01-25 | 2020-12-25 | 华为技术有限公司 | Method and device for switching IPTV multicast to unicast |
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