CN101022326A - Time delay control method and device thereof - Google Patents
Time delay control method and device thereof Download PDFInfo
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Abstract
A method for controlling time delay includes calculating jitter statistics value of network according time seal information of data packet received by buffer storage, converting network jitter statistics value to obtain time delay value of play, regulating time slot corresponding to data packet of each channel in play time slot table as per time delay value of play, using time slot to indicate queue-out time of data packet in each channel from buffer storage, controlling queue-out time of data packet in each channel from buffer storage according to regulated play time slot table.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of technology of the control of delaying time.
Background technology
Along with the generally use of the Internet (Internet) and the continuous development of self-technique thereof, people carry out the interchange of various information on the network of being everlasting.Yet, exist time-delay, shake (Jitter), packet loss, problem such as out of order can cause inevitable influence in the network to the exchange of information on the network, wherein the shake in the network is one of comparatively common problem.In the network, data are packaged into different packets and transmit in network, because the path that each packet is walked in the packet switching network may be different, network delay is also just different so, thereby cause the packet change of the time of advent, this time-delay changes just cries shake.Adopt the shake that increases time-delay elimination network side at network equipment receiving terminal, be called as and tremble buffer memory (JB, Jitter Buffer), the size of time-delay is the ability that the degree of depth of JB has determined to remove network jitter.
JB is divided into static JB and DYNAMIC J B at present, and wherein, static JB eliminates network jitter for introducing constant time lag, but this constant time lag may be different with the time-delay degree of depth of actual needs, influenced professional time-delay or quality.DYNAMIC J B can adjust time-delay automatically according to the situation of network, makes the less time-delay of assurance under certain packet loss situation.Therefore DYNAMIC J B adjusts the key technology that strategy is an assurance Network Transmission quality at present.
In the prior art, in order to solve the problem of network jitter, real-time transport protocol (rtp) has proposed the shake that the JB notion is eliminated network.In Real-time Transport Protocol to the definition of Jitter be calculated as follows:
Si represents the source end time stamp of i bag, and Ri represents the local time stamp of i bag, and Sj represents the source end time stamp of j bag, and Rj represents the local time stamp of j bag, and then i, the difference D in two RTP packet network transmission times of j can be expressed as:
D(i，j)＝(Rj-Ri)-(Sj-Si)＝(Rj-Sj)-(Ri-Si) (1)
The every packet of the Jitter value of network will upgrade statistics, with statistical value with newly arrive packet | D| obtains new Jitter statistical value with different weight additions.
J(i)＝(15/16)×J(i-1)+(1/16)×|D(i-1，i)| (2)
It is exactly to convert according to this Jitter statistical value to obtain that the JB degree of depth is promptly play time-delay.As long as the general JB degree of depth is just play time-delay and just can be eliminated network jitter greater than the actual jitter of network.
In the prior art, the time stamp precision of carrying the network message of time stab information is generally 1/8ms, so the unit of network jitter statistical value also is 1/8ms usually.The packing of a network message is relevant with the concrete business of being carried at interval, is generally the integral multiple of 5ms, for example is packing VOIP service message at interval with 10ms.
Receiving terminal conspires to create a chained list with the message that receives according to the sequencing of sequence number or time stamp usually or writes in the storage matrix, and the precision of its time-delay control is with the packing unit of being spaced apart, and its time-delay adjustment is operating as deletion or inserts a packet.Usually the JB degree of depth is exactly that the jitter statistical value is rounded to an immediate 10ms greater than it.Such as the jitter statistical value is 357, and statistical value unit is 1/8ms, i.e. 44.625ms, and the then current JB degree of depth is rounded to 50ms.
10ms at interval for example packs, JB degree of depth 50ms, if the JB degree of depth becomes 60ms, then the JB degree of depth needs to raise, for linked list type JB, promptly in the JB chained list, insert the 10ms packet of a compensation, if when the JB degree of depth becomes 40ms, then the JB degree of depth needs downward modulation, i.e. 10ms packet of deletion in the JB chained list.
From the method for above-mentioned prior art time-delay control as can be seen, the precision of time-delay control is with the packing unit of being spaced apart, have only the integral multiple of packaging time length for the user configured JB degree of depth, when network delay changes less than packaging time length, if adjust the time-delay of packet in receiving buffer memory according to the integral multiple of packaging time length, can introduce some unnecessary time-delays, have influence on the real-time of upper-layer service.
Summary of the invention
In view of this, the embodiment of the invention proposed a kind of can with delay time less than the adjustment step-length of packaging time length control method and device thereof.
For solving the problems of the technologies described above, the purpose of the embodiment of the invention is achieved through the following technical solutions:
A kind of method of the control of delaying time is used for achieving a butt joint and receives the control of each channel data packet delay of buffer memory, and described method comprises:
The time stab information computing network shake statistical value of the packet that receives according to described reception buffer memory;
According to the slot length of playing the time slot table and the time stab information of packet, described network jitter statistical value converted obtains the broadcast delay value of packet, and the slot length of described broadcast time slot table is less than the packaging time length of described packet;
According to playing the corresponding time slot that each channel data bag in the time slot table is play in the delay value adjustment, the corresponding time slot of described packet is used for indicating each channel data to wrap in the time that described reception buffer memory is made team's processing;
Control each channel data bag going out group time from receive buffer memory according to adjusted broadcast time slot table.
A kind of device of the control of delaying time is used for achieving a butt joint and receives the control of each channel data packet delay of buffer memory, and the device of described time-delay control comprises:
Play the time slot table, comprise at least one time slot less than packaging time length, the time slot of described packet is used for indicating each channel data to wrap in the time that described reception buffer memory is made team's processing;
Computing unit is used for the time stab information computing network shake statistical value according to the packet of described reception buffer memory reception, and obtains playing delay value according to described network jitter statistical value conversion;
Adjust performance element, upgrade described broadcast time slot table according to the described computing unit broadcast delay value that obtains that converts, and according to the control of delaying time of described broadcast time slot table.
The method and the system thereof of the time-delay control that provides by the embodiment of the invention, the user can adopt the adjustment of small step progress line delay, promptly be configured to time slot less than packaging time length and be unit and data are wrapped in receiving delays time in the buffer memory controls, therefore control data wraps in the time-delay that receives in the buffer memory more accurately and efficiently, can satisfy the business transmission of high real-time and high precision time-delay.
Description of drawings
Fig. 1 is the structure chart of overrun control preferred embodiment of the present invention;
Fig. 2 is the flow chart of delay control method preferred embodiment of the present invention;
Fig. 3 A is a single-track link table formula structural representation;
Fig. 3 B is a doubly linked list formula structural representation.
Embodiment
The embodiment of the invention provides a kind of method and device thereof of the control of delaying time, by computing network shake statistical value, described network jitter statistical value is scaled the broadcast delay value of packet, then according to described broadcast delay value, adjust the corresponding time slot of playing packet in the time slot table, realize the time-delay control of packet in receiving buffer memory according to adjusted broadcast time slot table again.
For making technical scheme of the present invention clearer, below with reference to accompanying drawing and enumerate embodiment, the present invention is described in more detail.
Please refer to Fig. 1, be the delay time structure chart of device preferred embodiment of control of the present invention.Described overrun control 1 comprises interface unit 11, plays time slot table 12, adjusts performance element 13, computing unit 10 and judging unit 17.Described computing unit 10 comprises network jitter computing unit 14, network jitter statistic unit 15, time-delay computing unit 16.
Described interface unit 11 is used to receive and forward delay interval control device 1 and receive the information of transmitting between the buffer memory 2, and for example obtain the needed information of time-delay control from receiving buffer memory 2: each channel data bag arrives the time that receives buffer memory, the time that goes out team from receive buffer memory etc., receives space structure information such as sheet format, linked list type or both combinations etc. of buffer memory 2.
Described broadcast time slot table 12 comprises some time slots less than packaging time length, and the time slot of described packet is used for indicating each channel data to wrap in the time that described reception buffer memory is made team's processing.
Described network jitter computing unit 14 is used for calculating new network jitter value according to the temporal information of the new data packets of obtaining from interface unit 11.
Described network jitter statistic unit 15 is according to described network jitter value computing network shake statistical value.
Described time-delay computing unit 16 calculates with a time interval of setting according to the network jitter statistical value and plays delay value, the broadcast delay value that current time calculates gained is called the desirable delay value of playing, the broadcast delay value that current time is using is called current broadcast delay value, and mode that calculate to play delay value is the delay value of unit with the time slot for the network jitter statistical value being rounded up nearest.Such as statistical value is 36.2ms, if time slot unit is 1ms, then rounding and obtaining 37ms is current broadcast time-delay, if time slot unit is 2ms, then be rounded to 38ms, promptly 16 slot lengths are current broadcast time-delay, and the broadcast delay value that will at every turn calculate gained is sent to judging unit 17.
The difference between the magnitude relationship of the absolute door limit value that described judging unit 17 sets in advance according to current broadcast delay value that obtains from time-delay computing unit 16 and upper layer application unit 3 and current broadcast time-delay are delayed time with desirable broadcast and the magnitude relationship of packaging time length, judge adopting big step-length is that packaging time length still adopts little step-length promptly according to playing time slot table delay time adjustment and the direction of adjusting.
Adjust performance element 13 and adopt big step-length or the adjustment of small step progress row according to the indication of described judging unit 17, small step is long to be adjusted if adopt, then according to the adjustment of delaying time of described broadcast time slot table 12, if adopt big step-length adjustment, then adopt the adjustment of delaying time of big step-length, for example in buffer memory, delete or insert packet by interface unit 11.
Please refer to Fig. 2, be the flow chart of the present invention's method preferred embodiment of realization high accuracy time-delay control in receiving buffer memory, described delay control method specifically comprises:
Step 201: the time stab information computing network shake statistical value Jitter of the packet that receives according to described reception buffer memory, upgrade the network jitter statistical value simultaneously, described computing network shake statistical value method is same as the prior art, does not do here and gives unnecessary details.
Step 202: judged whether the time-delay adjustment constantly,, if not, then carry out step 211 if then carry out step 203;
Described time-delay adjustment is carried out once at set intervals, blanking time can be as required and network condition be provided with.The described time-delay set-up procedure that is provided with can adopt as the case may be, can omit this step.
Step 203: according to the slot length of playing the time slot table and the time stab information of packet, described network jitter statistical value conversion is obtained the broadcast delay value of packet, the slot length of described broadcast time slot table is less than the packaging time length of described packet, being about to the Jitter statistical value, to round up nearest be that the value of unit is the broadcast delay value with the time slot, wherein for a certain moment, the broadcast delay value that current time calculates gained is called the desirable delay value of playing, and the broadcast delay value that current time is using is called current broadcast delay value:
Described broadcast time slot table comprises at least one time slot less than packaging time length, is used to indicate each time slot to have which passage need do data and contracts out team's processing.
The space structure that receives buffer memory has linked list type, sheet format etc.Table 1 is that sheet format receives the spatial table of buffer memory, suppose to receive the data service that buffer memory is used to receive N passage, and each passage can hold M packet, so the memory space table of a N * M size of needs.
Table 1 sheet format receives the spatial table of buffer memory
| Channel number | Each |
||||
| 1 | |
|
…… | Bag M-1 | Bag |
| 2 | Bag 1 | |
…… | Bag M-1 | Bag M |
| …… | …… | …… | …… | …… | …… |
| N-1 | Bag 1 | |
…… | Bag M-1 | Bag M |
| N | Bag 1 | Bag 2 | …… | Bag M-1 | Bag M |
Playing the time slot table can adopt sheet format or linked list type structure to store equally.For example adopt the sheet format structure, the packing time interval of tentation data bag is Xms, and the precision that time-delay is adjusted is promptly delayed time and adjusted step-length is (X/Y) ms, wherein Y is an integer, the user can be configured, and the broadcast time slot table size that needs so to set up is Y * N, and is as shown in table 2:
Table 2 sheet format receives the broadcast time slot table of buffer memory correspondence
| Timeslot number | Each passage is play |
||||
| 1 | |
|
… | Passage N-1 | Passage N |
| 2 | Passage 1 | Passage 2 | … | Passage N-1 | Passage N |
| … | … | … | … | … | … |
| Y-1＝9 | Passage 1 | Passage 2 | … | Passage N-1 | Passage N |
| Y＝10 | Passage 1 | Passage 2 | … | Passage N-1 | Passage N |
The linked list type structure is divided into two-way and single-track link table, and single-track link table comprises its back unit of a pointed for each unit.Fig. 3 A is depicted as single-track link table formula structure chart, and single-track link table refers to that each unit all comprises the unit of its back storage data of a pointed, and having or not head and afterbody is head pointer and null pointer, is determined by concrete condition.Fig. 3 B is depicted as doubly linked list formula structure chart, doubly linked list refers to that each unit all comprises two pointers and points to the unit of its previous storage data and the unit of back storage data respectively, having or not head and afterbody is head pointer and null pointer, is also determined by concrete condition.Receive buffer memory and can store packet with this linked list type structure with broadcast time slot table.In the broadcast time slot table of linked list type structure, the channel number string that belongs to together individual time slot is in a chained list.
Usually write the data packet and receive buffer memory and be called and join the team, from receiving buffer memory packet output payment upper strata is called team, the packing time interval X of tentation data bag is 10ms, Y round numbers 10, then adjusting step-length is 1ms, every row is represented a 1ms time slot in the table 2, always have 10 time slots, each cell all has a flag bit, and which passage is used to identify certain time slot has to make team's processing, and promptly certain passage is which time slot to go out team at.
Step 204: whether judge current broadcast delay value greater than the absolute door limit value, if, then carry out step 205, if not, then carry out step 206;
Described absolute door limit value can be preestablished by the upper layer application unit, if the current delay value surpasses described absolute door limit value, illustrates that then the current network time-delay is bigger, at this time to the fine setting DeGrain of the degree of depth, can adopt the adjustment of delaying time of big step-length; If the current delay value surpasses described absolute door limit value, illustrate that the current network time-delay is less, can further improve professional real-time, can adopt the adjustment of delaying time of the long adjustment of small step step-length.
Step 205: adopting big step-length is that packaging time length is to adjust the step-length control of delaying time, by increasing in receiving buffer memory or deleting the time-delay that a packet is adjusted the reception buffer memory.
Step 206: judge whether the desirable difference of playing between delay value and the current broadcast delay value surpasses packaging time length, if, then carry out step 205, if not, then carry out step 207;
When ideal is play the current relatively broadcast delay value variation of delay value more above packaging time length, adopt big step-length adjustment faster time-delay to be adjusted to the right place, but it also is same passable adopting long adjustment of small step, so whether this step can be selected to adopt by the user.
Step 207: judge whether the total number of channels on the new time slot has reached preset upper limit, if, then carry out step 208, if not, then carry out step 209;
The upper limit that goes out group total number of channels of each time slot of configuration in playing the time slot table is used for limiting the packet sum that a time slot is upwards paid according to the disposal ability on upper strata.During device initialize, each time slot channel density is provided with 0, can dispose down the total number of channels upper limit of a time slot in working order, has reached the upper limit if promptly go out team's logical total road number during certain time slot, does not then allow new passage will go out group time modification to this time slot.
Step 208: continue the new time slot that the search total number of channels does not reach preset upper limit and satisfies delay requirement;
For example, the previous moment JB degree of depth is 13ms, and the JB degree of depth of new statistics is 11ms, then the former time slot sign 3 of this passage can be removed, and is mid-effectively at the grid of time slot 2.If group total number of channels that goes out on the time slot 2 has reached the upper limit at this moment, then the JB degree of depth is shifted time slot 1 onto before can selecting to continue, or keeps time slot 3 constant.
Step 209: adjust and play the time slot table;
If described packet is then determined the corresponding time slot of each channel data bag in the described broadcast time slot table for receiving first packet that each passage received in the buffer memory according to the broadcast delay value of described packet:
First packet is play constantly, and (ms)=first packet receives time stamp (ms)+initial time delay (ms);
Certain channel slot number=first packet is play % packaging time length X constantly.
Wherein, A is to the B delivery in " A%B " expression, be the remainder of A after divided by B, for example, packaging time length is 10ms, and it is 10ms that first packet receives time stamp, initial time delay is 3ms, then to play constantly be 13ms for first packet, and rounding complementation, to obtain certain channel slot number be 3, is that the flag set in certain channel unit lattice of 3 is effective at this moment with timeslot number.Other channel services adopt same way.
If described packet is then adjusted the broadcast time slot of each channel data bag as follows for receiving other packets except that first packet that each passage received in the buffer memory:
If the current network jitter value increases with respect to the broadcast delay value of previous moment, then postpone according to the broadcast time slot of increase amplitude with described packet; If the current network jitter value reduces with respect to the broadcast delay value of previous moment, then shift to an earlier date according to the broadcast time slot of minimizing amplitude with described packet.
For sheet format is play the time slot table, when described current Jitter value surpasses the broadcast delay value of previous moment, illustrating needs to increase the time-delay of packet in receiving buffer memory, therefore need to postpone according to the broadcast time slot of increase amplitude with packet, it is invalid for example the sign of the original broadcast time slot correspondence of this passage to be changed into, and the pairing sign of broadcast time slot that the back is fit to is made as effectively; When described current Jitter value during less than the broadcast delay value of previous moment, illustrating needs to reduce the time-delay of packet in receiving buffer memory, therefore need to shift to an earlier date according to the broadcast time slot of minimizing amplitude with packet, it is invalid for example passage to be changed at the sign of original broadcast time slot correspondence, and the pairing sign of broadcast time slot that the front is fit to is made as effectively.
For linked list type is play the time slot table, when described current Jitter value surpasses the broadcast delay value of previous moment, illustrating needs to increase the time-delay of packet in receiving buffer memory, the passage chained list of current broadcast time slot correspondence is searched this channel number from play the time slot table, delete this channel number, and this channel number is inserted in the passage chained list of next broadcast time slot correspondence, can be other positions of passage chained list afterbody or channel position correspondence; When described current Jitter value during less than the broadcast delay value of previous moment, illustrating needs to reduce the time-delay of packet in receiving buffer memory, the passage chained list of current broadcast time slot correspondence is searched this channel number from play the time slot table, delete this channel number, and this channel number is inserted in the passage chained list of a last broadcast time slot correspondence.
Hence one can see that, and list structure generally is the dynamic assigning memory space, it is advantageous that to save the space and distribute flexible; The sheet format structure then is equivalent to the static allocation internal memory, may cause the waste in space, but does not need dynamically to search the position of channel number, has superiority on the speed.
Step 210: upgrade current broadcast time-delay and delay time for desirable the broadcast;
Step 211: according to current broadcast time slot table the packet of each passage is controlled in the time-delay that receives buffer memory, i.e. control data bag going out group time from receive buffer memory.
Each time slot is checked the broadcast time slot table row of this timeslot number correspondence in playing the time slot table, the packets need of checking which passage goes out team's processing, and finish out team operation, and check next line at next time slot, so check and make data repeatedly and contract out team and handle from 1～Y is capable.When taking turns to certain time slot next time, just in time be the packaging time length of a packet, also be the crack goes out the moment that next data in the passage of team contract out team at this moment.
The method and the system thereof of the time-delay control that provides by the embodiment of the invention, the user can adopt the adjustment of small step progress line delay, promptly be configured to time slot less than packaging time length and be unit and data are wrapped in receiving delays time in the buffer memory controls, therefore control data wraps in the time-delay that receives in the buffer memory more accurately and efficiently, can satisfy the business transmission of high real-time and high precision time-delay.
More than to provided by the present invention a kind of delay time control method and system be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1. the method for control of delaying time is used for achieving a butt joint and receives the control of each channel data packet delay of buffer memory, it is characterized in that described method comprises:
The time stab information computing network shake statistical value of the packet that receives according to described reception buffer memory;
According to the slot length of playing the time slot table and the time stab information of packet, described network jitter statistical value converted obtains the broadcast delay value of packet, and the slot length of described broadcast time slot table is less than the packaging time length of described packet;
According to playing the corresponding time slot that each channel data bag in the time slot table is play in the delay value adjustment, the corresponding time slot of described packet is used for indicating each channel data to wrap in the time that described reception buffer memory is made team's processing;
Control each channel data bag going out group time from receive buffer memory according to adjusted broadcast time slot table.
2. the method for time-delay according to claim 1 control is characterized in that, also comprises before playing the corresponding time slot that the delay value adjustment plays each channel data bag in the time slot table described: determine that current broadcast delay value is less than threshold value.
3. the method for time-delay control according to claim 1, it is characterized in that, before playing the corresponding time slot that the delay value adjustment plays each channel data bag in the time slot table, also comprise described: determine current broadcast delay value less than threshold value and the variation of playing time-delay less than packaging time length.
4. according to the method for claim 2 or 3 described time-delay controls, it is characterized in that described threshold value is set in advance by the upper layer application unit.
5. the method for time-delay control according to claim 1, it is characterized in that, described the network jitter statistical value broadcast delay value obtain packet that converts is specially: with the network jitter statistical value nearest slot length to play in the time slot table that rounds up is the broadcast delay value of unit;
6. the method for time-delay control according to claim 1, it is characterized in that, described reception buffer memory and play the time slot table and be sheet format or be the linked list type structure perhaps receives buffer memory and plays time slot table the two one of them and is the sheet format structure, and another is the linked list type structure.
7. the method for time-delay control according to claim 1 is characterized in that, described corresponding time slot according to each channel data bag in the broadcast delay value adjustment broadcast time slot table is specially:
If described packet is then determined the corresponding time slot of each channel data bag in the described broadcast time slot table for receiving first packet that each passage received in the buffer memory according to the broadcast delay value of described packet;
If described packet is then adjusted the broadcast time slot of each channel data bag as follows for receiving other packets except that first packet that each passage received in the buffer memory:
If the current network jitter value increases with respect to the broadcast delay value of previous moment, then postpone according to the broadcast time slot of increase amplitude with described packet; If the current network jitter value reduces with respect to the broadcast delay value of previous moment, then shift to an earlier date according to the broadcast time slot of minimizing amplitude with described packet.
8. according to the method for claim 1 or 7 described time-delay controls, it is characterized in that also dispose the total number of channels upper limit that single time slot allows out team's operation in the described broadcast time slot table, described method also comprises:
Described according to after playing the corresponding time slot that the delay value adjustment plays packet in the time slot table, if the corresponding time slot of packet is adjusted to the time slot that corresponding total number of channels has reached the upper limit, then continue search and satisfy the new time slot of delay requirement or abandon this time-delay adjustment.
9. the device of control of delaying time is used for achieving a butt joint and receives the control of each channel data packet delay of buffer memory, it is characterized in that the device of described time-delay control comprises:
Play the time slot table, comprise at least one time slot less than packaging time length, the time slot of described packet is used for indicating each channel data to wrap in the time that described reception buffer memory is made team's processing;
Computing unit is used for the time stab information computing network shake statistical value according to the packet of described reception buffer memory reception, and obtains playing delay value according to described network jitter statistical value conversion;
Adjust performance element, upgrade described broadcast time slot table according to the described computing unit broadcast delay value that obtains that converts, and according to the control of delaying time of described broadcast time slot table.
10. the device of time-delay control according to claim 9, it is characterized in that, also comprise judging unit, when being used for determining that current broadcast delay value that described time-delay computing unit calculates is less than threshold value, control described adjustment performance element according to the control of delaying time of the time slot of playing the time slot table.
11. the device of time-delay control according to claim 9 is characterized in that described computing unit comprises:
The network jitter computing unit is used for the time stab information computing network jitter value according to the packet that receives;
The network jitter statistic unit is used for according to described network jitter value computing network shake statistical value;
The time-delay computing unit is used for obtaining playing delay value according to described network jitter statistical value conversion.
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