CN101615987B - Method and device for reliably transmitting real-time service in wireless communication system - Google Patents
Method and device for reliably transmitting real-time service in wireless communication system Download PDFInfo
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- CN101615987B CN101615987B CN2008101157372A CN200810115737A CN101615987B CN 101615987 B CN101615987 B CN 101615987B CN 2008101157372 A CN2008101157372 A CN 2008101157372A CN 200810115737 A CN200810115737 A CN 200810115737A CN 101615987 B CN101615987 B CN 101615987B
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Abstract
The invention provides a method for reliably transmitting real-time service in a wireless communication system, which comprises the following steps that: a sending end sets a first control sequence number representing a sending state for each real-time service session packet and sends the first control sequence number to a terminal; at a receiving end, a receiving buffer receives the real-time service session packet and starts a retransmission mechanism, and the retransmission mechanism uses the first control sequence number for retransmission; then, a wobble buffer is arranged behind the receiving buffer; and according to the first control sequence number and a second control sequence number representing a receiving state at the receiving end, the network property of the real-time service session packet is detected, and finally the size of the wobble buffer is self-adaptively adjusted according to the network property. The invention also provides a device for reliably transmitting the real-time service in the wireless communication system. The device consists of two parts, namely a sending unit of the sending end and a receiving unit of the receiving end. The sending unit comprises a first control sequence number setting module and a sending retransmission module; and the receiving unit comprises a receiving buffer module, a wobble buffer module, a detection module and a buffer adjusting module.
Description
Technical field
The present invention relates to a kind of in wireless communication system the method for transmitting real-time service and device reliably.
Background technology
In traditional wireless communication system; In order to resist the delay jitter that produces in the network; The reception buffer of receiving terminal can be sent into wobble buffer after receiving real-time service session packet, plays behind the removal delay jitter, to guarantee the play quality of real-time service session packet again.
The sketch map of removal shake is seen shown in Figure 1, is example with the speech business.
Transmitting terminal sends voice conversation bag 1～9 according to the certain hour interval T, after the wireless channel transmission, certain variation has taken place in proper order when arriving receiving terminal.Since No. 2 with No. 6 voice conversations wrap in postpone in the channel bigger, therefore at receiving terminal, when No. 4 voice conversation bags arrive reception buffer, No. 2 just arrival; Simultaneously, when No. 9 voice conversation bags arrive, No. 6 just arrival.
In order to guarantee the normal broadcast in order of voice conversation bag, receiving terminal is provided with wobble buffer and receives the voice conversation bag that arrives receiving terminal after reception buffer, and the current maximum delay of establishing this wobble buffer is 2T.
Wobble buffer begins to play bag No. 1 constantly from receiving No. 1 2T after the bag, continues to receive the voice conversation bag from reception buffer simultaneously.No. 1 bag is play the T moment after the beginning, should play bag No. 2 according to the transmitting terminal order.Though No. 2 packet generation certain delay, do not arrive receiving terminal in order because the carryover effects of wobble buffer, when needs were play No. 2 bags, No. 2 bag arrived wobble buffers just, therefore play No. 2 bag smoothly.
When No. 6 bags need to play, wrap no show receiving terminal still, therefore insert quiet bag for No. 6 to fill a vacancy.The reason of No. 6 bag no show receiving terminals is that it postpones the maximum delay 2T that 3T has exceeded wobble buffer.
Quiet bag is play beginning back T constantly, though No. 6 bags arrive, because the broadcast delay requirement of voice, must play No. 7 of leaving in the wobble buffer and wrap, and therefore, encapsulates for No. 6 and to abandon.
This shows that wobble buffer plays a part very big for the play quality of real time business in the wireless communication system.But the maximum delay of traditional wobble buffer is set to fixed value, and the shortcoming of this mode is:
1. be provided with lessly when the maximum delay of wobble buffer, and the delay variation in the network is when big, can't normally orderly broadcast real-time service session packet, may occur long-time do not have bag broadcast and a real-time service session packet abandon phenomenon in a large number.
When the maximum delay setting of wobble buffer bigger, and the delay variation in the network is hour, because the delay of wobble buffer itself causes the delay at session two ends long, influences the quality of real time business equally.
The wobble buffer that therefore, can adapt to the network and the characteristic of channel should be adjusted according to the network characteristic self adaptation.Simultaneously, in order to resist the phenomenon of losing of real time business bag, the mechanism of faults and re-transmission should be set also.
Summary of the invention
The present invention proposes the method for reliably transmitting real-time service in a kind of wireless communication system, can realize retransmitting when real-time service session packet is lost, and the adjustment of the self adaptation of wobble buffer, level and smooth play quality guarantees reliable real time business effect.This method may further comprise the steps:
A. transmitting terminal is controlled sequence number for each real-time service session packet is provided with first of an expression transmit status, and real-time service session packet is sent to receiving terminal;
B. the reception buffer of receiving terminal receives real-time service session packet and launches retransmission mechanism, and this retransmission mechanism retransmits according to the first control sequence number;
C. receiving terminal adds wobble buffer after reception buffer;
D. according to the second control sequence number of the expression accepting state of first control sequence number and receiving terminal, the network characteristic of detection real-time service session packet;
E. according to network characteristic, self adaptation adjustment wobble buffer is big or small.
Among the preferred step b, receiving terminal detects the real-time service session packet of losing, and then triggers the re-transmission based on NACK message.
In the preferred steps d, said network characteristic can be the delay jitter characteristic.Further, the second control sequence number is the receiving terminal frame number.
Among the preferred step e,, adjust the size of wobble buffer based on the statistics of the network characteristic in the certain hour.Further, according to certain probability demands select in the said statistics particular value as the adjustment wobble buffer reference, said probability can be the target packet loss.
The invention allows for the device of transmitting real-time service bag in a kind of wireless communication system, comprise the transmitting element of transmitting terminal and the receiving element of receiving terminal.
Transmitting element comprises:
The first control sequence number is provided with module, is used to the first control sequence number that each real-time service session packet is provided with an expression transmit status;
Send retransmission module, be used to send from the first control sequence number real-time service session packet of module is set, and resend the real-time service session packet of losing.
Receiving element comprises:
The reception buffer module is used to receive the real-time service session packet from transmitting element, and representes the second control sequence number of accepting state for each real-time service session packet record; This module is also launched retransmission mechanism, and this retransmission mechanism retransmits according to the first control sequence number;
The wobble buffer module is used to receive the real-time service session packet from the reception buffer module, carries out the buffering and the broadcast of real-time service session packet;
Detection module according to the first control sequence number and the second control sequence number, is estimated the network characteristic of real-time service session packet;
The buffer adjusting module is used for the network characteristic that draws according to detection module, the size of adjustment wobble buffer.
Description of drawings
Do further detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Fig. 1 is a jitter buffer sketch map in the wireless communication system;
Fig. 2 is a wireless communication system voice transfer structural representation;
Fig. 3 is the flow chart of reliable voice transmission session packet method;
Fig. 4 is the sketch map of reliable voice transmission session packet method;
Fig. 5 is a wobble buffer self adaptation adjustment flow chart;
Fig. 6 is the sketch map of reliable voice transmission session packet device.
Embodiment
The present invention has realized a kind of in wireless communication system, the method for reliably transmitting real-time service.With the speech business is example, and the transmission of wireless communication system voice generally is made up of three unit, and is as shown in Figure 2, comprises network (being used for speech source), base station (being used for voice transmits) and terminal (being used for voice receives).Existing embodiment with speech business is described below, and is as shown in Figure 3:
At first, the base station is provided with a bag sequence number for each voice conversation bag, and the voice conversation bag is sent to the terminal.
Then, the end side reception buffer receives the voice conversation bag, will identify less than the correct voice packet that receives, and sends NACK message and gives the base station, carries the sequence number that does not have correctly to receive the voice conversation bag in the NACK message; The voice conversation bag that will exceed the retransmission window scope of reception buffer abandons; The voice conversation bag that correctly receives is sent into wobble buffer.
Subsequently, wobble buffer receives the voice conversation bag, whether in the jitter buffer window ranges, confirms to receive or abandon this session packet according to this bag.After receiving the voice conversation bag, wobble buffer calculates the delay jitter of this bag and notes, and this section of statistics all in the time arrive the delay jitter record of voice conversation bag behind statistic period T _ adjust, according to the size of statistic adjustment wobble buffer.
At last, from wobble buffer, extract voice conversation bag and broadcast.
Fig. 4 has described the use of wobble buffer combination retransmission mechanism, the voice reliable transmission is played the sketch map of assurance.
The base station is provided with a bag sequence number for each voice conversation bag, and sends bag successively 1～No. 6 with cycle T, wherein, wraps in for No. 2 and to lose in the channel, wraps for No. 6 bigger delay has taken place.The terminal reception buffer just to base station feedback NACK message, informs that the base station resends bag No. 2 after detecting No. 2 packet loss, and the base station is retransmitted bag No. 2 when sending No. 7 bags.
In end side, reception buffer is all sent into wobble buffer to the bag that correctly receives at every turn.Wobble buffer receive No. 1 the bag after 5T begin to play bag constantly No. 1.No. 1 bag is play the T moment after the zero hour, and No. 2 bag is just sent to wobble buffer, so No. 2 encapsulate smooth broadcast.Afterwards 3～No. 9 Bao Jun according to time interval T by played in order, thereby satisfy the excellent quality of speech play.
In order to satisfy changeable channel circumstance, in said process, the maximum delay of wobble buffer is along with the variation of voice conversation packet delay shake is adjusted.Idiographic flow is seen Fig. 5, is described below:
1. the maximum delay D of initialization wobble buffer.
2. wobble buffer receives the voice conversation bag of present frame from reception buffer.
3. calculating each delay that arrives the voice conversation bag of wobble buffer according to following formula trembles
Moving delay_packet:
delay_packet＝current_fn-should_arrive_fn；
Wherein, current_fn is the current frame number that the voice conversation bag arrives, and should_arrive_fn is the frame number that the voice conversation bag should arrive, and should_arrive_fn notes through the sequence number that the base station is set for each bag.
4. if current time of reception has satisfied cycle T _ adjust; Then add up all delay_packet in this cycle; Select specific delay_packet according to probability P, be made as wobble buffer maximum delay adjustment reference quantity delay, wherein probability P is made as the target packet loss.
5. the current maximum delay D of wobble buffer and two target retard amount aim_delay1 and aim_delay2 are compared, if D＞aim_delay1 then make D=D+constant1; If D＜aim_delay2 then makes D=D-constant2; If aim_delay2≤D≤aim_delay1, then D remains unchanged.Wherein aim_delay1 and aim_delay2 are the functions of delay, and constant1 and constant2 are specific constants.After adjustment finishes, got back to for the 2nd step.
The present invention has also realized in a kind of wireless communication system, the device of reliably transmitting real-time service session packet, and its structure is seen Fig. 6.This device comprises the transmitting element of base station side and the receiving element of end side.
Transmitting element comprises:
The first control sequence number is provided with module, is used to each real-time service session packet a bag sequence number is set;
Send retransmission module, be used to send from the first control sequence number real-time service session packet of module is set, and resend the real-time service session packet of losing;
Receiving element comprises:
The reception buffer module is used to receive the real-time service session packet from transmitting element, and is each real-time service session packet recorder end frame number; This module is also launched retransmission mechanism, and this retransmission mechanism is to use the bag sequence number to retransmit, detect the real-time service session packet of losing after, then trigger re-transmission based on NACK message.
The wobble buffer module is used to receive the real-time service session packet from the reception buffer module, carries out the buffering and the broadcast of real-time service session packet;
Detection module according to bag sequence number and receiving terminal frame number, is estimated the delay jitter characteristic of real-time service session packet;
The buffer adjusting module is used for the statistics based on the network characteristic in the certain hour, according to the reference of the particular value in the said statistics of target packet loss requirement selection as the adjustment wobble buffer, adjusts the size of wobble buffer.
Claims (4)
1. the method for reliably transmitting real-time service in the wireless communication system may further comprise the steps:
A. transmitting terminal is controlled sequence number for each real-time service session packet is provided with first of an expression transmit status, and real-time service session packet is sent to receiving terminal;
B. the reception buffer of receiving terminal receives real-time service session packet and launches retransmission mechanism, and this retransmission mechanism retransmits according to the first control sequence number;
C. receiving terminal adds wobble buffer after reception buffer;
D. according to the second control sequence number of the expression accepting state of first control sequence number and receiving terminal, the network characteristic of detection real-time service session packet;
E. according to network characteristic, self adaptation is adjusted the size of wobble buffer;
It is characterized in that the concrete steps of the said self adaptation adjustment of step e are following:
E.1, the maximum delay D of initialization wobble buffer;
E.2, wobble buffer receives the voice conversation bag of present frame from reception buffer;
E.3, calculate the delay jitter delay_packet that each arrives the voice conversation bag of wobble buffer according to following formula:
delay_packet＝current_fn-should_arrive_fn；
Wherein, current_fn is the current frame number that the voice conversation bag arrives, and should_arrive_fn is the frame number that the voice conversation bag should arrive, and should_ arrive_fn notes through the sequence number that the base station is set for each bag;
E.4; If current time of reception has satisfied cycle T _ adjust, then add up all delay_packet in this cycle, select specific delay_packet according to probability P; Be made as wobble buffer maximum delay adjustment reference quantity delay, wherein probability P is made as the target packet loss;
E.5, the current maximum delay D of wobble buffer and two target retard amount aim_delay1 and aim_delay2 are compared, if D＞aim_delay1 then make D=D+constant1; If D＜aim_delay2 then makes D=D-constant2; If aim_delay2≤D≤aim_delay1, then D remains unchanged, and wherein aim_delay1 and aim_delay2 are the functions of delay, and constant1 and constant2 are specific constants, after adjustment finishes, gets back to for the step e.2.
2. method according to claim 1 is characterized in that step b, and receiving terminal detects the real-time service session packet of losing, and then triggers the re-transmission based on NACK message.
3. the device of transmitting real-time service bag in the wireless communication system, this device comprises the transmitting element of transmitting terminal and the receiving element of receiving terminal:
Transmitting element comprises:
The first control sequence number is provided with module, is used to the first control sequence number that each real-time service session packet is provided with an expression transmit status;
Send retransmission module, be used to send from the first control sequence number real-time service session packet of module is set, and resend the real-time service session packet of losing;
Receiving element comprises:
The reception buffer module is used to receive the real-time service session packet from transmitting element, and representes the second control sequence number of accepting state for each real-time service session packet record; This module is also launched retransmission mechanism, and this retransmission mechanism retransmits according to the first control sequence number;
The wobble buffer module is used to receive the real-time service session packet from the reception buffer module, carries out the buffering and the broadcast of real-time service session packet;
Detection module is used for estimating the network characteristic of real-time service session packet according to the first control sequence number and the second control sequence number, is specially according to following formula and calculates the delay jitter delay_packet that each arrives the voice conversation bag of wobble buffer:
delay_Packet＝current_fn-should_arrive_fn；
Wherein, current_ fn is the current frame number that the voice conversation bag arrives, and should_arrive_fn is the frame number that the voice conversation bag should arrive, and should_arrive_fn notes through the sequence number that the base station is set for each bag;
The buffer adjusting module is used for the network characteristic that draws according to detection module, and the size of adjustment wobble buffer is specially:
All delay_packet in statistic period T _ adjust select specific delay_packet according to probability P, are made as wobble buffer maximum delay adjustment reference quantity delay, and wherein probability P is made as the target packet loss; The current maximum delay D of wobble buffer and two target retard amount aim_delay1 and aim_delay2 are compared; If D＞aim_delay1 then make D=D+constant1 is if D＜aim_delay2 then makes D=D-constant2; If aim_delay2≤D≤aim_delay1; Then D remains unchanged, and wherein aim_delay1 and aim_delay2 are the functions of delay, and constant1 and constant2 are specific constants.
4. device according to claim 3 is characterized in that the reception buffer module, detect the real-time service session packet of losing after, then trigger re-transmission based on NACK message.
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| CN104410587A (en) * | 2014-11-13 | 2015-03-11 | 京信通信系统（中国）有限公司 | Method and device for controlling capacity of receive buffer zone |
| CN107450534B (en) * | 2017-07-28 | 2020-11-27 | 珞石（山东）智能科技有限公司 | Robust planning system for processing robot network communication jitter |
| CN109688066B (en) * | 2018-12-29 | 2020-11-13 | 合肥埃科光电科技有限公司 | Gateway filtering driving method based on GigE Vision |
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| CN1541470A (en) * | 2001-08-10 | 2004-10-27 | Ħ��������˾ | Method of determining volumn of resequenced buffer and method of transmitting data via RF link |
| CN101179362A (en) * | 2006-11-07 | 2008-05-14 | 中兴通讯股份有限公司 | Automatic retransmission request mechanism suitable for mobile stream media application |
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| CN1541470A (en) * | 2001-08-10 | 2004-10-27 | Ħ��������˾ | Method of determining volumn of resequenced buffer and method of transmitting data via RF link |
| CN101179362A (en) * | 2006-11-07 | 2008-05-14 | 中兴通讯股份有限公司 | Automatic retransmission request mechanism suitable for mobile stream media application |
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