CN106899380A - A kind of VOLTE visual telephones transmission method and its system - Google Patents
A kind of VOLTE visual telephones transmission method and its system Download PDFInfo
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- CN106899380A CN106899380A CN201510961170.0A CN201510961170A CN106899380A CN 106899380 A CN106899380 A CN 106899380A CN 201510961170 A CN201510961170 A CN 201510961170A CN 106899380 A CN106899380 A CN 106899380A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0079—Formats for control data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
- H04L43/0829—Packet loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/32—Flow control; Congestion control by discarding or delaying data units, e.g. packets or frames
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/33—Flow control; Congestion control using forward notification
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Environmental & Geological Engineering (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
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- Mobile Radio Communication Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention relates to areas of information technology, a kind of VOLTE visual telephones transmission method and its system are disclosed.In the present invention, receiving terminal receives VOLTE videotelephony data bags, to transmitting terminal send feedback information；Wherein, the feedback information is the reception state of the packet；Feedback information of the transmitting terminal according to received by judges whether packet loss；If it is present retransmitting the packet lost.With it, transmitting terminal can in time check whether packet loss, and in packet loss, realize that reliable quickly data are retransmitted, reduce overall time delay, reduce overhead.
Description
Technical field
The present invention relates to areas of information technology, more particularly to a kind of VOLTE visual telephones transmission method and its system.
Background technology
VOLTE (Voice over LTE, LTE network visual telephone) visual telephone business be 4G communication core business it
One, it is also the big function progress for being different from traditional call service, wherein, a kind of IP data transmission technologies of VOLTE, video data
Transmitted using RTP (Real-time Transport Protocol, RTP), control information passes through RTCP (RTP
Control Protocol, RTCP Real-time Transport Control Protocol) transmission, use SIP (Session Initiation Protocol, meeting
Words initiation protocol) consult video transmission parameter.From unlike general video stream media service, the emphasis of visual telephone business
It is real-time, interactive, this means that necessary strict controlling transmission time delay, it is impossible to data more long are set up as Streaming Media
Buffering area, can otherwise significantly affect Consumer's Experience.It is very sensitive to packet loss additionally, due to video data, then cannot if there is packet loss
Image is correctly decoded, and image error can be accumulated, until next key frame occurs.Therefore for VOLTE visual telephone business
For, the transmission quality of data has a direct impact to image effect.
Processing mode currently for packet loss is broadly divided into be fed back by band external information and realizes that packet loss is retransmitted, or directly
Fed back by in-band information and realize that packet loss is retransmitted.Retransmitted mainly using RTP/AVPF (Audio-Visual Profile with outer
With Feedback, audio video transmission feedback) mechanism, NACK (non-response) message is fed back by RTCP, notify that transmitting terminal is retransmitted
The packet of loss.Retransmitted mainly by feedback information addition RTP bags with interior, transmission is fed back to by transmission of video passage
End, transmitting terminal retransmits data after parsing the information.But these methods still have limitation：
First, back off time is long.There is no clear and definite packet loss to indicate for RTP, generally counted by receiving terminal.
If it find that packet exceeds schedule time do not receive yet, be judged to packet loss, can cause when packet loss is found already close to or it is super
The Normal Play Time of the packet is crossed, along with the pending datas such as feedback message are retransmitted, causes that video time delay is excessive (may to be reached
By several seconds)；If once finding data packet sequence row number mistake repeat request immediately, then, so seeming can reduce re-transmission and prolong
When, but because packet is only out of order rather than packet loss, so as to produce excessive feedback message, ultimately result in transmitting terminal hair
Play many unnecessary data to retransmit, can cause bandwidth nervous on the contrary, further produce packet loss, finally take more time in number
According in re-transmission.
Second, packet loss information can not reliably be fed back.RTCP is used with outer re-transmission, in VOLTE visual telephone business
RTCP bandwidth needs offered, and generally very low, it is meant that can not arbitrarily send RTCP message, how much is actually needed feedback
Information is difficult to estimate, it is possible to cause RTCP packet losses, and packet loss information is generally only fed back once, once packet loss will influence to retransmit
Effect.For being retransmitted in band, although return message using video channel and do not exist bandwidth problem, but RTP also can in itself
Packet loss, thus feedback message or probably due to data packetloss and transmitting terminal cannot be delivered to.
3rd, overhead is big.Either in band or with external feedback, receiving terminal feedback letter generally only after there is packet loss
Breath, so transmitting terminal can only know which data receiving terminal loses, and cannot learn which data have received, or played
Which data.Cause transmitting terminal as much as possible the video data bag for having sent can only be cached, to ensure to receive to lose
Corresponding packet can be retransmitted during bag feedback message.But it is largely data cached to account for because video code flow is high, data volume big
Used multisystem internal memory, memory size is natively very limited particularly in embedded environment, probably due to low memory causes
Run-time error.
The content of the invention
It is an object of the invention to provide a kind of VOLTE visual telephones transmission method and its system so that transmitting terminal can
Packet loss is checked whether in time, and in packet loss, realizes that reliable quickly data are retransmitted, reduced overall time delay, reduction system and open
Pin.
In order to solve the above technical problems, embodiments of the present invention provide a kind of VOLTE visual telephones transmission method, bag
Containing following steps：
Receiving terminal receives VOLTE videotelephony data bags, to transmitting terminal send feedback information；Wherein, the feedback information
It is the reception state of the packet；Feedback information of the transmitting terminal according to received by judges whether packet loss；If
In the presence of then retransmitting the packet of loss.
Embodiments of the present invention additionally provide a kind of VOLTE visual telephones Transmission system, comprising：Receiving terminal and transmission
End；The receiving terminal is included：Communication module, for receiving VOLTE videotelephony data bags；To transmitting terminal send feedback information；
Wherein, the feedback information is the reception state of the packet；The transmitting terminal is included：Packet loss determination module, for basis
Received feedback information judges whether packet loss；And when packet loss is determined that, retransmit the packet lost.
In terms of existing technologies, embodiment of the present invention is in terms of existing technologies, main for embodiment of the present invention
Distinguish and effect is：Receiving terminal makes transmitting terminal by the reception state to transmitting terminal feedback VOLTE videotelephony data bags
It is quick to understand whether packet sends successfully, so as to determine whether there is packet loss by transmitting terminal.Even if feedback information is by packet loss,
Can further determine whether there is packet loss by follow-up feedback information, greatly improve the reliability of packet loss judgement, so that
Obtain embodiment of the present invention and realize that reliable quickly data are retransmitted, reduction time delay, it is to avoid increase bandwidth burden.
In addition, in the step of the send feedback information to transmitting terminal, by realtime transmission protocol RTP bag to the hair
Sending end carries out band internal feedback.Band internal feedback is carried out to transmitting terminal by RTP bags, the bandwidth that RTCP transmits message will not be taken,
Do not interfere with the transmission of interior video code flow so that even if frequently send will not be impacted to available data transmission, so as to protect yet
Card send feedback information stabilization.
In addition, the packet is to that should have unique sequence numbers；In the step of the send feedback information to transmitting terminal, lead to
The reception state of the sequence number instruction packet for sending data accepted bag is crossed to have received；Judged whether described
In the step of packet loss, if the sequence number corresponding to the packet that has sent of the transmitting terminal is not in received feedback information
In, then judge the data-bag lost.By the step, the transmitting terminal in embodiment of the present invention can be made, without waiting for connecing
The report of receiving end, by judging the sequence number corresponding to the data that transmitting terminal has sent or not received feedback information
In, realization just can judge whether packet is lost by feedback information itself, further reduce overall time delay.
In addition, in the step of the sequence number of the transmission data accepted bag, the sequence number that need to be sent is encoded
After retransmit；It is described judge whether packet loss the step of in, also comprising following sub-step：The feedback letter that decoding is received
Breath, obtains the corresponding sequence number of packet that the state is reception state.By the step, it is possible to reduce feedback information exists
Shared accessing cost for data in RTP extension headers, so as to increase the practicality of embodiment of the present invention, is conducive to embodiment party of the present invention
The popularization of formula.
In addition, before the step of the sequence number of the transmission data accepted bag, also comprising the steps of：Detection is to be sent
The broadcast state of the corresponding packet of sequence number；In the step of the sequence number of the transmission data accepted bag, transmission is not broadcast
The sequence number corresponding to packet put.By the step, feedback information can be further reduced shared in RTP extension headers
Accessing cost for data.
In addition, when the transmitting terminal sends the VOLTE videotelephony datas bag, transmitted packet is backed up into hair
Sending end is cached；In the transmitting terminal after the feedback information is received, also comprise the steps of：The transmitting terminal is according to being connect
The feedback information for receiving determines the packet that the receiving terminal has been received by, and the packet that the receiving terminal is had been received by is from institute
State release in transmitting terminal caching.By the step, the transmitting terminal in embodiment of the present invention can be enable according to received by
Feedback information determines the packet that receiving terminal has been received by, and the packet that will be had been received by discharges from transmitting terminal caching,
So as to reduce buffer memory, overhead is reduced.
Brief description of the drawings
Fig. 1 is according to a kind of schematic flow sheet of VOLTE visual telephones transmission method of first embodiment of the invention；
Fig. 2 is according to a kind of schematic flow sheet of VOLTE visual telephones transmission method of second embodiment of the invention；
Fig. 3 is according to a kind of schematic flow sheet of VOLTE visual telephones transmission method of third embodiment of the invention；
Fig. 4 is to implement a kind of packet loss of VOLTE visual telephones transmission method according to the present invention the 3rd to retransmit schematic flow sheet；
Fig. 5 is according to a kind of block diagram of VOLTE visual telephones Transmission system of four embodiment of the invention；
Fig. 6 is according to a kind of packet loss determination module of VOLTE visual telephones Transmission system of fifth embodiment of the invention
Block diagram；
Fig. 7 is according to a kind of block diagram of VOLTE visual telephones Transmission system of sixth embodiment of the invention；
Fig. 8 is the lattice according to feedback message in a kind of VOLTE visual telephones transmission method of first embodiment of the invention
Formula schematic diagram；
Fig. 9 be according in a kind of VOLTE visual telephones transmission method of first embodiment of the invention feedback message it is another
Plant form schematic diagram；
Figure 10 be according in a kind of VOLTE visual telephones transmission method of first embodiment of the invention feedback message it is another
Middle form schematic diagram；
Figure 11 be according in a kind of VOLTE visual telephones transmission method of first embodiment of the invention feedback message it is another
Form schematic diagram in one.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to each reality of the invention
The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each implementation method of the invention,
In order that reader more fully understands the application and proposes many ins and outs.But, even if without these ins and outs and base
Many variations and modification in following implementation method, it is also possible to realize the application each claim technology required for protection
Scheme.
First embodiment of the invention is related to a kind of VOLTE visual telephones transmission method.Its flow is as shown in figure 1, tool
Body is as follows：
Step 101, receiving terminal receives VOLTE videotelephony data bags, to transmitting terminal send feedback information.
Specifically, receiving terminal receives VOLTE videotelephony data bags, can be VOLTE voice transfers and VOLTE videos
Transmission, can be by realtime transmission protocol RTP bag to transmitting terminal send feedback information.Wherein, feedback information connecing for packet
Receipts state.The reception state of packet, can have and receive and do not received state.
It is noted that the transmission frequency of feedback information can be controlled freely, it is not necessary to which each RTP bag carries feedback
Information, can only when receiving terminal data buffering state changes, to transmitting terminal feedback information.Such as, when receiving terminal is new
Receive packet, or packet, when being played, receiving terminal just can be to transmitting terminal feedback information.
In the present embodiment, because packet is to that should have unique sequence numbers, so receiving terminal has received number by sending
The reception state of packet is indicated to have received according to the sequence number of bag.
Step 102, feedback information of the transmitting terminal according to received by judges whether packet loss.If being judged as YES, enter
Enter step 103；If being judged as NO, terminate this flow.
Step 103, transmitting terminal retransmits the packet lost.
Specifically, transmitting terminal can be according to the feedback information for receiving, and acquisition state is the packet of reception state
Corresponding sequence number, then whether the sequence number according to corresponding to judging the packet that transmitting terminal has sent is received anti-
In feedforward information, judge whether packet loss.If judging packet loss, transmitting terminal retransmits the packet lost.That is, feedback information with
RTP packet number represents that the RTP data segments that transmitting terminal has received receiving terminal are listed one by one, the sky between each section
Hole region is packet loss region.Be additionally, since is that the RTP data segments that transmitting terminal has received receiving terminal list judgement one by one
Whether packet loss, so the packet loss again when transmitting terminal feedback reception end, transmitting terminal can also learn all of by subsequent message
Packet drop, will not cause feedback information to be omitted because of packet loss.
Such as, feedback information can be expressed as：Seq0-Seq1, Seq3-Seq4 ... ....Can by this feedback message
To learn：Because follow-up data bag is received, hole region is between Seq1 to Seq3, so between Seq1 to Seq3
Packet may packet loss, the packet of transmitting terminal re-transmission Seq1-Seq3；If there is no other feedback informations after Seq4,
Then explanation receiving terminal not yet receives the packet after Seq4.After transmitting terminal retransmits Seq1-Seq3 packets, receive
Feedback information is still：Seq0-Seq1, Seq3-Seq4 ... ..., then transmitting terminal may determine that biography Seq1-Seq3 packets again
Secondary packet loss, can again retransmit Seq1-Seq3 packets, and Seq1-Seq3 packet quilts are determined until basis receives feedback information
Untill receiving terminal is received.
It should be noted that in the present embodiment, receiving terminal is only responsible for for the reception state of packet feeding back to transmission
End, is not made whether the judgement of packet loss, but the sequence as transmitting terminal according to corresponding to judging the packet that transmitting terminal has sent
Number whether in received feedback information, judge whether packet loss, it is total such that it is able to reduce without waiting for the report of receiving terminal
Body time delay, control retransmits rhythm, receiving terminal is received the packet of loss as early as possible in the case where normal data is not influenceed, will not
Cause significantly to decode broadcast time-delay；And, will not be as receiving terminal, packet can only be retransmitted once, but according to being connect
After the feedback information for receiving determines certain packet packet loss, repeatedly retransmit, untill the receiving end reception of certain packet is determined,
So as to can guarantee that packet loss information is reliably passed on.
Preferably, receiving terminal is retransmited after can the sequence number that need to be sent be encoded, transmitting terminal can first decode reception
The feedback information for arriving, then carries out packet loss judgement.Wherein, feedback information is carried by RTP extension headers and transmitted.Its cataloged procedure is such as
Shown in lower：
Feedback message is transmitted by RTP Header Extension, and RTP Header forms are as shown in figure 8, treating to scheme
After X bit set in 8, Header Extension can be enabled, its form is as shown in Figure 9.
Defined by profile in Fig. 9 are used to distinguish different RTP Header Extension, and the field can
To arrange according to practical service environment, if running into the terminal for not supporting this method, feedback information can be skipped, solution is not influenceed
Code；Length shows the specific length of Header Extension；Header extension are information particular content.
In the present embodiment, during specific feedback information fills in header extension, form is as shown in Figure 10.
SSRC in Figure 10 is the SSRC of transmitting terminal RTP data flows, so that transmitting terminal distinguishes different feedback informations；
Sequence number represent initial RTP packet number, fixed to take 16 bits；Len and delta represent follow-up RTP bag sequences
Row number, length is variable, and sequence number will occur in pairs, is used to refer to a sequence number section, but section sum is not limited；end
Marker represents that sequence number section terminates, and is fixed as " 11111110 "；It is finally pad parts (filling 0), to keep 32 bits pair
Together.
RTP packet number is 16 unsigned numbers, so represent that a sequence number section would take up 32 bits, in order to carry
High-transmission efficiency needs to reduce feedback information length as far as possible.In real-time system, the video bag quantity of caching will not be very big, so
An a small range is concentrated on RTP packet number in feedback information is usual, as long as therefore complete first sequence number of transmission
Value (sequence number fields), subsequently only (len and delta fields) by translation sequence increment.In order to further
Amount of compressed data, len and delta fields are variable-length.Len fields are decoded first from data flow during decoding, and (len should be with
End marker are distinguished), the bit length of delta can be obtained, then read the length data as delta, last root
According to the value composition sequence number of len and delta.
Len coding rules are：When len is 0 to 6,3 bit datas are converted directly into；When len is 7 to 16,3 are first filled in
Bit prefix " 111 ", followed by n " 1 ", is finally " 0 " that the number of middle " 1 " is related to len numerical value.
The computational methods of sequence number increment are：Work as len>When 0, sequence number increment=1<<(len-1)+delta；Work as len=
When 0, sequence number increment=0.A upper sequence number adds current sequence number increment, you can obtain current sequence number value.
Specific coding is as follows, and the smaller code word of sequence number increment is shorter, and in most cases RTP packet number concentrates on small model
In enclosing, therefore efficiency of transmission higher can be obtained, shown in following form 1.
Form 1
If for example, feedback message is Seq103-Seq210, Seq212-Seq215, Seq220-Seq240, then using sequence
Number incremental representation is：103 (starting sequence numbers), 107,2,3,5,20.Concrete numerical value and correspondence code word are：
Sequence number=103, code word=0000000001100111
Len0=7, delta0=43, code word=1110 | 101011
Len1=2, delta1=0, code word=010 | 0
Len2=2, delta2=1, code word=010 | 1
Len3=3, delta3=1, code word=011 | 01
Len4=5, delta4=4, code word=101 | 0100
Source body (not including end marker and pad) totally 30 bit, if not using this method to compress and use 16
Bit sequence number transmission then needs 96 bits.Complete RTP Header Extension are as shown in figure 11.
Certainly, in actual applications, also other implementations, no longer enumerate herein.
By present embodiment, receiving terminal by feeding back the reception state of VOLTE videotelephony data bags to transmitting terminal,
Transmitting terminal is set quickly to understand whether packet sends successfully, so as to determine whether there is packet loss by transmitting terminal.Even if feedback information
By packet loss, it is also possible to further determine whether there is packet loss by follow-up feedback information, the reliability of packet loss judgement is greatly improved
Property, so that embodiment of the present invention realizes that reliable quickly data are retransmitted, reduce time delay, it is to avoid increase bandwidth burden.
Second embodiment of the present invention is related to a kind of VOLTE visual telephones transmission method.Second embodiment and first
Implementation method is roughly the same, and main distinction part is：As shown in Fig. 2 in second embodiment of the invention, receiving terminal increases
The broadcast state of the corresponding packet of sequence number to be sent is detected, only to send the corresponding sequence number of packet do not played,
So, the quantity of the sequence number of receiving terminal transmission can be reduced, so as to reduce volume of transmitted data, efficiency of transmission is improved.
Difference is：Step 201, detects the broadcast state of the corresponding packet of sequence number to be sent.
Specifically, the reception state of packet can be divided into the RTP packet sequences for having received and having played by receiving terminal
Number, the RTP packet number that does not receive, the RTP packet number that has received but do not played, then will receive but do not played
RTP packet number feeds back to transmitting terminal, and the RTP packet number for having received and having played no longer feeds back to transmitting terminal.
Step 202 in present embodiment to 204 with the step 101 in first embodiment to 103 identical, do not do herein
Repeat.
By present embodiment, the quantity of the sequence number of receiving terminal transmission can be reduced, so as to reduce volume of transmitted data, carried
High-transmission efficiency, and then improve the experience of user.
Third embodiment of the present invention is related to a kind of VOLTE visual telephones transmission method.3rd implementation method and second
Implementation method is roughly the same, and main distinction part is：As shown in figure 3, in third embodiment of the invention, transmitting terminal according to
Received feedback information determines the packet that receiving terminal has been received by, and then these packets are released from transmitting terminal caching
Put, to reduce buffer memory, reduce overhead.
Step 301 in present embodiment, 302 with the step 201 in second embodiment, 202 identical, do not do herein superfluous
State.Difference is：
Step 303, feedback information of the transmitting terminal according to received by determines the packet that receiving terminal has been received by, and will receive
The packet that end has been received by discharges from transmitting terminal caching.
Specifically, the reception state of packet can be divided into the RTP packet sequences for having received and having played by receiving terminal
Number, the RTP packet number that does not receive, the RTP packet number that has received but do not played, then will receive but do not played
RTP packet number feeds back to transmitting terminal.After transmitting terminal receives feedback information, it can be determined that the RTP bags for having received but not played
RTP sequence numbers before sequence number have been received and played, the RTP after the RTP packet number for having received but not played
Sequence number is not received.Because transmitting terminal is when VOLTE videotelephony data bags are sent, can be standby by transmitted packet
Part takes sizable Installed System Memory to transmitting terminal caching, so the packet that will have been received discharges from transmitting terminal caching, can
To reduce buffer memory, overhead is reduced.
Illustrate present embodiment packet loss re-transmission flow as shown in Figure 4：
Initial state, the packet of in store Seq90 to Seq100 in the video cache of terminal A, the order caching of terminal B
Have been received by the packet of Seq90 to Seq99.
Terminal A sends the packet of Seq100.
After terminal B receives Seq100, feedback has been received by the packet of Seq90 to Seq100.
After terminal A receives feedback message, the packet of Seq90 to Seq100 is discharged from video cache, while newly encoded
Packet Seq101 add video cache, then send Seq101, occur packet loss in transmission.
Newly encoded packet Seq102 is added video cache by terminal A, then sends Seq102.
After terminal B receives Seq102, feedback has been received by Seq90 to Seq100, Seq102.
After terminal A receives feedback message, it is found that terminal B does not receive Seq101, Seq101 is then retransmitted, while paid-in
Seq102 is released.
After terminal B receives Seq101, feedback has been received by Seq90 to Seq102.
After terminal A receives feedback message, learn that terminal B has been received by Seq101, then discharge the data of video cache.
Step 304 in present embodiment, 305 with the step 203 in second embodiment, 204 identical, do not do herein superfluous
State.
By present embodiment, the feedback information that transmitting terminal can be according to received by determines the data that receiving terminal has been received by
Bag, and the packet that will be had been received by release from transmitting terminal caching, so as to reduce buffer memory, reduce overhead,
Be conducive to popularization of the invention.
Above the step of various methods divide, be intended merely to description it is clear, can be merged into when realizing a step or
Some steps are split, multiple steps are decomposed into, as long as comprising identical logical relation, all in the protection domain of this patent
It is interior；To adding inessential modification in algorithm or in flow or introducing inessential design, but its algorithm is not changed
With the core design of flow all in the protection domain of the patent.
Four embodiment of the invention is related to a kind of VOLTE visual telephones Transmission system, as shown in figure 5, comprising：Receiving terminal
And transmitting terminal.
Receiving terminal is included：Communication module, for receiving VOLTE videotelephony data bags；It is additionally operable to send anti-to transmitting terminal
Feedforward information.In the present embodiment, communication module carries out band internal feedback by realtime transmission protocol RTP bag to transmitting terminal.Wherein,
Feedback information is the reception state of packet, and communication module carries feedback information using RTP extension headers,
Transmitting terminal is included：Packet loss determination module, packet loss is judged whether for the feedback information received by basis；And
When packet loss is determined that, the packet lost is retransmitted.
It is noted that packet is to that should have unique sequence numbers.The communication module of receiving terminal has received number by sending
The reception state of packet is indicated to have received according to the sequence number of bag；The packet loss determination module of transmitting terminal, has sent in transmitting terminal
Packet corresponding to sequence number not in received feedback information when, judge data-bag lost.
By present embodiment, the practicality of embodiment of the present invention is increased, is conducive to realizing in actual applications,
So as to be conducive to the popularization of embodiment of the present invention.
It is seen that, present embodiment is the system embodiment corresponding with first embodiment, and present embodiment can be with
First embodiment is worked in coordination implementation.The relevant technical details mentioned in first embodiment still have in the present embodiment
Effect, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in
In first embodiment.
It is noted that each module involved in present embodiment is logic module, in actual applications, one
Individual logic unit can be a part for a physical location, or a physical location, can also be with multiple physics lists
The combination of unit is realized.Additionally, in order to protrude innovative part of the invention, will not be with solution institute of the present invention in present embodiment
The unit that the technical problem relation of proposition is less close is introduced, but this is not intended that in present embodiment do not exist other lists
Unit.
Fifth embodiment of the invention is related to a kind of VOLTE visual telephones Transmission system.5th implementation method is real with the 4th
Apply mode roughly the same, main distinction part is：Communication module is retransmited after the sequence number that need to be sent is encoded.And
As shown in fig. 6, in fifth embodiment of the invention, packet loss determination module further includes following submodule：Receiving submodule,
Decoding sub-module, decision sub-module.
Receiving submodule, for receiving feedback information；
Decoding sub-module, for decoding the feedback information that receiving submodule is received, acquisition state is reception state
The corresponding sequence number of packet；
Decision sub-module, the sequence number for being obtained according to decoding sub-module judges whether packet loss；And judging
It is when there is packet loss, to retransmit the packet lost.
Because second embodiment is mutually corresponding with present embodiment, therefore present embodiment can be mutual with second embodiment
It is engaged implementation.The relevant technical details mentioned in second embodiment are still effective in the present embodiment, implement second
The technique effect to be reached in mode in the present embodiment similarly it is achieved that in order to reduce repetition, no longer go to live in the household of one's in-laws on getting married here
State.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in second embodiment.
Sixth embodiment of the invention is related to a kind of VOLTE visual telephones Transmission system.6th implementation method is real with the 5th
Apply mode roughly the same, main distinction part is：As shown in fig. 7, transmitting terminal includes transmitting terminal buffer.
Transmitting terminal buffer, for when transmitting terminal sends VOLTE videotelephony data bags, storing transmitted packet
Backup；It is additionally operable to, when transmitting terminal receives feedback information, determine that receiving terminal has been received according to received feedback information
The packet for arriving, the packet that receiving terminal is had been received by discharges from transmitting terminal caching.
Because the 3rd implementation method is mutually corresponding with present embodiment, therefore present embodiment can be mutual with the 3rd implementation method
It is engaged implementation.The relevant technical details mentioned in 3rd implementation method are still effective in the present embodiment, implement the 3rd
The technique effect to be reached in mode in the present embodiment similarly it is achieved that in order to reduce repetition, no longer go to live in the household of one's in-laws on getting married here
State.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in the 3rd implementation method.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiment of the invention,
And in actual applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (13)
1. a kind of VOLTE visual telephones transmission method, it is characterised in that comprise the steps of：
Receiving terminal receives VOLTE videotelephony data bags, to transmitting terminal send feedback information；Wherein, the feedback information is institute
State the reception state of packet；
Feedback information of the transmitting terminal according to received by judges whether packet loss；If it is present retransmitting the number lost
According to bag.
2. VOLTE visual telephones transmission method according to claim 1, it is characterised in that sent to transmitting terminal described
In the step of feedback information, band internal feedback is carried out to the transmitting terminal by realtime transmission protocol RTP bag.
3. VOLTE visual telephones transmission method according to claim 2, it is characterised in that sent to transmitting terminal described
In the step of feedback information, the feedback information is carried by the RTP extension headers and transmitted.
4. VOLTE visual telephones transmission method according to claim 1, it is characterised in that the packet is to that should have only
One sequence number；
In the step of the send feedback information to transmitting terminal, the number is indicated by the sequence number for sending data accepted bag
It is to have received according to the reception state of bag；
It is described judge whether packet loss the step of in, if the sequence number corresponding to the packet that has sent of the transmitting terminal
Not in received feedback information, then the data-bag lost is judged.
5. VOLTE visual telephones transmission method according to claim 4, it is characterised in that received number in the transmission
In the step of according to the sequence number for wrapping, retransmited after the sequence number that need to be sent is encoded；
It is described judge whether packet loss the step of in, also comprising following sub-step：The feedback information that decoding is received, obtains
The state is the corresponding sequence number of packet of reception state.
6. VOLTE visual telephones transmission method according to claim 4, it is characterised in that received number in the transmission
Before the step of according to the sequence number for wrapping, also comprise the steps of：Detect the broadcast state of the corresponding packet of sequence number to be sent；
In the step of the sequence number of the transmission data accepted bag, the sequence number corresponding to packet that transmission is not played.
7. VOLTE visual telephones transmission method according to claim 1, it is characterised in that the transmitting terminal sends described
During VOLTE videotelephony data bags, transmitted packet is backed up into transmitting terminal caching；
In the transmitting terminal after the feedback information is received, also comprise the steps of：
Feedback information of the transmitting terminal according to received by determines the packet that the receiving terminal has been received by, by the reception
The packet that end has been received by discharges from transmitting terminal caching.
8. a kind of VOLTE visual telephones Transmission system, it is characterised in that include：Receiving terminal and transmitting terminal；
The receiving terminal is included：
Communication module, for receiving VOLTE videotelephony data bags；To transmitting terminal send feedback information；Wherein, the feedback letter
It is the reception state of the packet to cease；
The transmitting terminal is included：
Packet loss determination module, packet loss is judged whether for the feedback information received by basis；And lost being determined that
Bao Shi, retransmits the packet lost.
9. VOLTE visual telephones Transmission system according to claim 8, it is characterised in that the communication module is by real
When host-host protocol RTP bags to the transmitting terminal carry out band internal feedback.
10. VOLTE visual telephones Transmission system according to claim 9, it is characterised in that the communication module utilizes institute
State RTP extension headers and carry the feedback information.
11. VOLTE visual telephones Transmission systems according to claim 8, it is characterised in that the packet is to that should have only
One sequence number；
The communication module of the receiving terminal indicates the reception state of the packet by sending the sequence number of data accepted bag
To have received；
The packet loss determination module of the transmitting terminal, is not being connect in the sequence number corresponding to the packet that the transmitting terminal has sent
When in the feedback information for receiving, the data-bag lost is judged.
12. VOLTE visual telephones Transmission systems according to claim 11, it is characterised in that the communication module is just
The sequence number that need to be sent is retransmited after being encoded；
The packet loss determination module further includes following submodule：
Receiving submodule, for receiving feedback information；
Decoding sub-module, for decoding the feedback information that the receiving submodule is received, obtains the state to have received shape
The corresponding sequence number of packet of state；
Decision sub-module, the sequence number for being obtained according to the decoding sub-module judges whether packet loss；And judging
It is when there is packet loss, to retransmit the packet lost.
13. VOLTE visual telephones Transmission systems according to claim 8, it is characterised in that the transmitting terminal includes transmission
End buffer, for when the transmitting terminal sends the VOLTE videotelephony datas bag, storing the standby of transmitted packet
Part；It is additionally operable to, when the transmitting terminal receives the feedback information, the reception be determined according to received feedback information
The packet that end has been received by, the packet that the receiving terminal is had been received by discharges from transmitting terminal caching.
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Application publication date: 20170627 Assignee: Shanghai Li Ke Semiconductor Technology Co., Ltd. Assignor: Leadcore Technology Co., Ltd. Contract record no.: 2018990000159 Denomination of invention: Transmission method and system for VOLTE video call License type: Common License Record date: 20180615 |
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