CN102480760B - Intersystem link protocol frame dropping processing and frame-compensating distinguishing method and device - Google Patents
Intersystem link protocol frame dropping processing and frame-compensating distinguishing method and device Download PDFInfo
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Abstract
The invention provides an ISLP (intersystem link protocol) frame dropping processing and frame-compensating distinguishing method and a device. The ISLP frame dropping processing method is applied to an encrypted voice service and comprises the following steps: a network element determines that an ISLP frame transmitted currently drops a frame; the network element determines compensating information according to an identifier of the ISLP frame previous to the dropped frame; and the network element can compensate the dropped frame according to the compensating information. By adopting the invention, the method and the device can ensure the continuity and the rate stability of 64 kbps PCM (Pulse Code Modulation) code streams and can transmit frame dropping information to an encrypted terminal correctly.
Description
Technical field
The present invention relates to the communications field, in particular to link protocol ISLP frame frame losing processing method, ISLP frame compensated frame method of discrimination and ISLP frame frame losing processing unit, ISLP frame compensated frame discriminating gear between a kind of system.
Background technology
The encrypted speech that the encrypted speech business need network equipment can transparent transmission be sent by hand-held encryption terminal flows.The medium surface networking of encrypted speech business as shown in Figure 1, comprise and encrypt terminal and BSC (Base Station Controller, base station controller), MGW (Media GateWay, media gateway), the network element such as RNC (Radio Network Controller, radio network controller).Wherein, encryption terminal is responsible for the encryption and decryption of voice, and BSC, MGW are responsible for the transmission of encrypted speech stream.
For the network equipment, encrypted speech business essence is a kind of encrypted speech transparent transmission business, require can not do any encoding and decoding to encrypted speech in transmitting procedure, but encrypted speech code bag according to ISLP (Intersystem Link Protocol, link protocol between system) be adapted to PCM (the Pulse Code Modulation of 64kbps, pulse-code modulation) code stream, at IP (Internet Protocol, Internet Protocol) transparent transmission in bearer network and TDM (Time Division Multiplexing, time division multiplexing) carrying.
ISLP agreement provides following service to upper strata: carry out rate adapted, the user data synchronization of different rates is become to the speed of 64kbps.Become this process of 64kbps for adaptive the user data synchronization of different rates; From the code stream of 64kbps speed, extract this process of user data adaptive for separating.
ISLP protocol processes flow chart as shown in Figure 2, carry out between application layer and physical layer by adaptation procedure, from top to bottom, and through synchronous three steps of interpolation-> framing->.
(application layer) receives SDU (Service Data Unit, service data unit) from upper strata for step 202, ISLP, and in an ISLP SDU, maximum can be carried 1508 bytes, and the ISLP SDU of reception as shown in Figure 3;
Step 204, to receive ISLP SDU carry out interpolation and take out Value Operations;
Concrete, when interpolation, if comprise 5 continuous 1 in the bit of the SDU of ISLP stream, just must be at 51 continuous rear insertion one bits 0, to prevent from being mistaken as identifier " 01111110 " (binary system), generate SDU model M odifiedSDU, as shown in Figure 4;
Step 206, carry out framing operation;
Concrete, before and after Modified SDU, each identifier " 01111110 " that adds, generates PDU (Protocol DataUnit, protocol Data Unit), as shown in Figure 5;
Step 208, simultaneous operation;
Concrete, when synchronous, between each PDU, add some continuous identifiers " 01111110 ", guarantee to form the code stream that speed is 64kbps; While transmission in physical layer like this, ISLP PDU is by several " 01111110 " bit stream that identifier formed isolation continuously, and each ISLP PDU starts and some identifiers that ended up, and forms ISLP frame, as shown in Figure 6.
Separate adaptation procedure from the bottom up, contrary with adaptation procedure, referring to Fig. 2.First from the code stream of 64kbps, take out PDU; Then after removing identifier end to end, obtain Modified SDU; Take out again Value Operations, if in the bit of Modified SDU stream, have 5 continuous 1, just delete immediately a bit 0 below; The SDU obtaining is like this exactly can be for the user data of upper layer application.
When encrypted speech code stream transmits in IP network, will inevitably run into the frame losing problem causing due to network congestion and time delay.Uncompensation in ISLP agreement, do not mention how frame losing is processed, but it is obviously not all right frame losing not being compensated to processing, because just cannot keep the speed of 64kbps.
In normal speech business, produce when frame losing, be by codec unit according to process above voice flow time the historical data that preserves compensate out a frame, to keep the continuation of voice.But for encrypted speech business, do not allow to do like this, because encrypted speech stream can not be resolved for the network equipment.
Existing common frame losing compensation method is to retransmit former frame, but this method can make receiving terminal receive the user data the same with former frame, these data are actually invalid, can be used as valid data after receiving and process, thereby cause decryption error but encrypt terminal.
For the frame losing compensation method meeting of retransmitting former frame in correlation technique, wrong content frame is sent to encryption terminal, cause the problem of decryption error, not yet propose at present effective solution.
Summary of the invention
The present invention aims to provide a kind of ISLP frame frame losing processing method, ISLP frame compensated frame method of discrimination and ISLP frame frame losing processing unit, ISLP frame compensated frame discriminating gear, the frame losing compensation method meeting of retransmitting former frame to solve in correlation technique sends to encryption terminal wrong content frame, causes the problem of decryption error.
According to an aspect of the present invention, provide a kind of ISLP frame frame losing processing method, having comprised: network element determines that frame losing appears in the ISLP frame of current transmission; And described network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame; Described network element compensates frame losing according to described compensated information, generates compensated frame.
Preferably, described network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, comprising: described network element is preserved last 8 byte bit of the ISLP frame of described frame losing former frame, and described last 8 bit are cyclic deformation forms of 01111110; Described network element is determined the number of repetition N of described last 8 bit according to the frame length of described frame losing.
Preferably, the frame length of described frame losing is determined in the following manner: the frame length of described frame losing equals the product of the transmission rate of ISLP frame in packing time and described encrypted speech business.
Preferably, described network element compensates frame losing according to described compensated information, comprising: described network element repeats described last 8 bit N time, constructs the compensated frame identical with the frame length of frame losing.
Preferably, described network element also comprises: described compensated frame is transferred to other network nodes after generating compensated frame.
According to another aspect of the present invention, provide a kind of ISLP frame compensated frame method of discrimination, be applied in encrypted speech business, having comprised: network node has received ISLP frame the parsing that network element sends, and obtains user data wherein; In the time that the length of described user data is less than default thresholding, described network node determines that the ISLP frame receiving is compensated frame; Wherein, described compensated frame refers to: when in described encrypted speech business, frame losing appears in the ISLP frame of current transmission, described network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, and according to described compensated information, frame losing is compensated, the compensated frame of generation.
According to a further aspect in the invention, provide a kind of ISLP frame frame losing processing unit, be applied in encrypted speech business, having comprised: the first determining unit, has occurred frame losing for the ISLP frame of determining current transmission; The second determining unit, for determining compensated information according to the identifier of the ISLP frame of frame losing former frame; Compensating unit, for according to described compensated information, frame losing being compensated, generates compensated frame.
Preferably, described the second determining unit comprises: preserve subelement, for preserving last 8 byte bit of ISLP frame of described frame losing former frame, described last 8 bit are cyclic deformation forms of 01111110; Determine subelement, for determine the number of repetition N of described last 8 bit according to the frame length of described frame losing.
Preferably, described definite subelement also for: determine that the frame length of described frame losing equals the product of the transmission rate of packing time and described encrypted speech business ISLP frame.
Preferably, described compensating unit also for: described last 8 bit are repeated N time, construct the compensated frame identical with the frame length of frame losing.
Preferably, also comprise: transmission unit, for by described compensated frame and transfer to other network nodes.
According to a further aspect in the invention, provide a kind of ISLP frame compensated frame discriminating gear, be applied in encrypted speech business, having comprised: receiving element, the ISLP frame the parsing that send for receiving network element, obtain user data wherein; The 3rd determining unit, while presetting thresholding, determines that the ISLP frame receiving is compensated frame for being less than when the length of described user data; Wherein, described compensated frame refers to: when in described encrypted speech business, frame losing appears in the ISLP frame of current transmission, described network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, and according to described compensated information, frame losing is compensated, the compensated frame of generation.
In the embodiment of the present invention, network element determines that frame losing appears in the ISLP frame of current transmission, determines compensated information according to the identifier of the ISLP frame of frame losing former frame, according to compensated information, frame losing is compensated, and generates compensated frame.The embodiment of the present invention adopts utilizes former frame ISLP frame identifier to compensate, ensure the continuity of 64kbps pcm stream and the stability of speed, and frame losing information correctly can be passed to encryption terminal, avoid as retransmitted former frame technology after existing frame losing, wrong content frame can be issued to encryption terminal, the deciphering of encrypting terminal is misled, and the embodiment of the present invention realizes simply simultaneously, can not produce extra load to system.
Brief description of the drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the medium surface networking schematic diagram according to the encrypted speech business of correlation technique;
Fig. 2 is the ISLP protocol processes flow chart according to correlation technique;
Fig. 3 is the ISLP SDU schematic diagram according to the reception of correlation technique;
Fig. 4 is the Modified SDU schematic diagram according to correlation technique;
Fig. 5 is the PDU schematic diagram according to correlation technique;
Fig. 6 starts and the ISLP frame schematic diagram of some identifiers that end up according to each ISLP PDU of correlation technique;
Fig. 7 is according to the process chart of the ISLP frame frame losing processing method of the embodiment of the present invention;
Fig. 8 is the process chart of determining compensated information according to the network element of the embodiment of the present invention according to the identifier of the ISLP frame of frame losing former frame;
Fig. 9 is according to the process chart of the ISLP frame compensated frame method of discrimination of the embodiment of the present invention;
Figure 10 is according to the process chart of the embodiment mono-of the embodiment of the present invention;
Figure 11 is according to the process chart of the embodiment bis-of the embodiment of the present invention;
Figure 12 is according to the first structural representation of the ISLP frame frame losing processing unit of the embodiment of the present invention;
Figure 13 is according to the structural representation of the second determining unit of the embodiment of the present invention;
Figure 14 is according to the second structural representation of the ISLP frame frame losing processing unit of the embodiment of the present invention;
Figure 15 is according to the structural representation of the ISLP frame compensated frame discriminating gear of the embodiment of the present invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.
In correlation technique, existing common frame losing compensation method is to retransmit former frame, but this method can make receiving terminal receive the user data the same with former frame, and these data are actually invalid, can be used as valid data after receiving and process but encrypt terminal, thereby cause decryption error.
For solving the problems of the technologies described above, the embodiment of the present invention provides link protocol ISLP frame frame losing processing method between a kind of system, is applied in encrypted speech business, and handling process as shown in Figure 7, comprising:
Step 702, network element determine that frame losing appears in the ISLP frame of current transmission;
Step 704, network element are determined compensated information according to the identifier of the ISLP frame of frame losing former frame;
Step 706, network element compensate frame losing according to compensated information, generate compensated frame.
In the embodiment of the present invention, network element determines that frame losing appears in the ISLP frame of current transmission, determines compensated information according to the identifier of the ISLP frame of frame losing former frame, according to compensated information, frame losing is compensated, and generates compensated frame.The embodiment of the present invention adopts utilizes former frame ISLP frame identifier to compensate, ensure the continuity of 64kbps pcm stream and the stability of speed, and frame losing information correctly can be passed to encryption terminal, avoid as retransmitted former frame technology after existing frame losing, wrong content frame can be issued to encryption terminal, the deciphering of encrypting terminal is misled, and the embodiment of the present invention realizes simply simultaneously, can not produce extra load to system.
Flow process as shown in Figure 7, step 704 is in the time implementing, and network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, and its handling process as shown in Figure 8, comprising:
Step 802, network element are preserved last 8 byte bit of the ISLP frame of frame losing former frame, and last 8 bit are cyclic deformation forms of 01111110;
Step 804, network element are determined the number of repetition N of last 8 bit according to the frame length of frame losing.
When enforcement, flow process as shown in Figures 7 and 8, the frame length of the frame losing wherein relating to is determined in the following manner: the frame length of frame losing equals the product of the transmission rate of ISLP frame in packing time and encrypted speech business.
When enforcement, network element compensates frame losing according to compensated information, and preferably, network element can repeat last 8 bit N time, constructs the compensated frame identical with the frame length of frame losing.
After network element generates compensated frame, compensated frame is transferred to other network nodes, other network nodes receive after ISLP frame, are confirmed whether that it is the normal frame of compensated frame or transmission data.
Based on same inventive concept, the embodiment of the present invention also provides a kind of ISLP frame compensated frame method of discrimination, is applied in encrypted speech business, and its handling process as shown in Figure 9, comprising:
Step 902, network node receive ISLP frame the parsing that network element sends, and obtain user data wherein;
Step 904, in the time that the length of user data is less than default thresholding, network node determines that the ISLP frame receiving is compensated frame; Wherein, compensated frame refers to: when frame losing appears in the ISLP frame of current transmission in encrypted speech business, network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, and according to compensated information, frame losing is compensated, the compensated frame of generation.
Flow process as shown in Figure 9, step 904 is in the time implementing, and preferably, default thresholding value can be worth 16bit, and when enforcement, default thresholding can also be got other values, for example, and 24bit, 32bit etc., determines as the case may be.
Now describe with several specific embodiments, specifically refer to below.
Embodiment mono-, frame losing compensation, handling process refers to Figure 10
Step 1002, judge whether this frame occurs frame losing, is to continue to perform step 1004, otherwise finish frame losing compensation flow process;
Last 8 bit of step 1004, preservation former frame, are designated F, according to ISLP agreement, and the cyclic shift variant that F is 01111110;
Step 1006, determine the length of this frame of losing according to packing time and 64kbps speed product;
Step 1008, constantly repeat last 8 bit of former frame, construct a compensated frame consistent with lost frames length;
Step 1010, compensated frame is sent, frame losing compensation flow process finishes.
Embodiment bis-: identification compensated frame, handling process refers to Figure 11
Step 1102, the 64kbps pcm stream receiving is separated adaptive according to ISLP agreement;
Step 1104, solve the user data SDU in ISLP frame;
Whether the SDU length that step 1106, judgement solve is less than 16bit, is to perform step 1108, otherwise execution step 1110;
Step 1108, determine that this frame is compensated frame;
Step 1110, determine that this frame is normal frame.
Embodiment tri-
Supposing to have the packing time is 3 frame user datas of 10ms, and every frame length is 4 byte BYTE, sends after need to becoming the speed pcm stream of 64kbps according to ISLP protocol adaptation; After receiving terminal is received, need to separate adaptation, restore this 3 frame user data.
User data frame 1:0x97F982F5 (10,010,111 11,111,001 10,000,010 11110101)
User data frame 2:0xC263C784 (11,000,010 01,100,011 11,000,111 10000100)
User data frame 3:0x1D3CBFE1 (00,011,101 00,111,100 10,111,111 11100001)
It is as follows that transmitting terminal carries out ISLP adaptation procedure:
Represent user data frame SDU1:10010111 11,111,001 10,000,010 11110101 with bit stream
The Modified SDU1 that carries out generating after interpolation is: 10,010,111 11,011,100 11,000,001 01,111,010 1
The PDU1 generating after it adds identifier is end to end: 01,111,110 10,010,111 11,011,100 1,100,000,101,111,010 101111110
Represent user data frame SDU2:11000010 01,100,011 11,000,111 10000100 with bit stream
The Modified SDU2 that carries out generating after interpolation is: 11,000,010 01,100,011 11,000,111 10000100
The PDU2 generating after it adds identifier is end to end: 01,111,110 11,000,010 01,100,011 1,100,011,110,000,100 01111110
Represent user data frame SDU3:00011101 00,111,100 10,111,111 11100001 with bit stream
The Modified SDU3 that carries out generating after interpolation is: 00,011,101 00,111,100 10,111,110 11,110,000 1
The PDU3 generating after it adds identifier is end to end: 01,111,110 00,011,101 00,111,100 1,011,111,011,110,000 101111110
Between PDU1, PDU2, PDU3, insert the bit stream 01111110 repeating, composition ISLP frame, to guarantee to form continuous 64kbps code stream.According to 10ms packing Time Calculation, the length of each ISLP frame is i.e. 80 BYTE of 640 bit.
ISLP frame 1:
01111110?01111110?10010111?11011100?11000001?01111010?10111111?00111111...00111111
ISLP frame 2:
00111111?00111111?01100001?00110001?11100011?11000010?00111111?00111111...00111111
ISLP frame 3:
00111111?00111111?00001110?10011110?01011111?01111000?01011111?10011111...10011111
If ISLP frame 2 has been lost while transmission on IP bearer network, receiving terminal is not received any data in the 10ms that should receive ISLP frame 2 so, has now just produced frame losing, needs receiving terminal to compensate in the time mailing to next network node.
Compensation method according to proposing in the embodiment of the present invention: do not receive any data in the 10ms that should receive frame 2, frame 2 has been lost, so need to compensate; Preserve last 8 bit of ISLP frame 1,00111111.This is the result of 1 of 01111110 ring shift right; According to 10ms packing Time Calculation, the length of the ISLP frame of loss is i.e. 80 BYTE of 640 bit; Constantly repeat last 8 bit of ISLP frame 1, construct the compensated frame of 80 BYTE.
Compensation ISLP frame 2:00111111 00111111 00111111......00111111 00,111,111 00111111 out.
Corresponding, next network node is received by ISLP frame 1, is compensated ISLP frame 2 out, the code stream that ISLP frame 3 forms, and need to identify compensated frame according to the method for discrimination in the embodiment of the present invention: carry out ISLP and separate adaptive: from 64kbps pcm stream, extract PDU:
PDU1：01111110?10010111?11011100?11000001?01111010?10111111?0
PDU2：01111110?01111110
PDU3：01111110?00011101?00111100?10111110?11110000?10111111?0
From PDU, extract Modified SDU:
Modified?SDU1：10010111?11011100?11000001?01111010?1
Modified SDU2: nothing
Modified?SDU3：00011101?00111100?10111110?11110000?1
From Modified SDU, the value of taking out obtains SDU:
SDU1：10010111?11111001?10000010?11110101
SDU2: nothing
SDU3：00011101?00111100?10111111?11100001
Separating the SDU2 length obtaining after adaptation is 0, is less than 16bit, so this frame is compensated frame.
Next like this network node just can be correct receive SDU1 and SDU3, and correctly identified compensated frame.Receive after data when encrypting terminal, will know that the 2nd frame has produced frame losing, facilitates it to be further processed.
If according to the compensation method of common repeating transmission former frame, what so next network node was received is exactly by ISLP frame 1, the ISLP frame 1 of retransmitting, the code stream that ISLP frame 3 forms, and separates adaptive process and is:
From 64kbps pcm stream, extract PDU:
PDU1：01111110?10010111?11011100?11000001?01111010?10111111?0
PDU2：01111110?10010111?11011100?11000001?01111010?10111111?0
PDU3：01111110?00011101?00111100?10111110?11110000?10111111?0
From PDU, extract Modified SDU:
Modified?SDU1：10010111?11011100?11000001?01111010?1
Modified?SDU2：10010111?11011100?11000001?01111010?1
Modified?SDU3：00011101?00111100?10111110?11110000?1
From Modified SDU, the value of taking out obtains SDU:
SDU1：10010111?11111001?10000010?11110101
SDU2：10010111?11111001?10000010?11110101
SDU3：00011101?00111100?10111111?11100001
Wherein the valid data of SDU2 are 10,010,111 11,111,001 10,000,010 11110101, the same with SDU1.At this moment going out which frame with regard to None-identified is compensated frame.
Like this, encrypt after terminal when data pass to by the network equipment, encrypt terminal and SDU2 will be used as to correct data receiver and get off to be decrypted, thus the decrypted result leading to errors.
Based on same inventive concept, the embodiment of the present invention also provides link protocol ISLP frame frame losing processing unit between a kind of system, is applied in encrypted speech business, and its structural representation as shown in figure 12, comprising:
, there is frame losing for the ISLP frame of determining current transmission in the first determining unit 1201;
The second determining unit 1202, for determining compensated information according to the identifier of the ISLP frame of frame losing former frame;
Compensating unit 1203, for according to described compensated information, frame losing being compensated, generates compensated frame.
In one embodiment, as shown in figure 13, the second determining unit 1202 can comprise:
Preserve subelement 1301, for preserving last 8 byte bit of ISLP frame of frame losing former frame, last 8 bit are cyclic deformation forms of 01111110;
Determine subelement 1302, for determine the number of repetition N of last 8 bit according to the frame length of frame losing.
In one embodiment, determine subelement 1302 also for: determine that the frame length of frame losing equals the product of the transmission rate of packing time and encrypted speech business ISLP frame.
In one embodiment, compensating unit 1203 also for: last 8 bit are repeated N time, construct the compensated frame identical with the frame length of frame losing.
In one embodiment, as shown in figure 14, ISLP frame frame losing processing unit can also comprise: transmission unit 1401, and for by compensated frame and transfer to other network nodes.
Based on same inventive concept, the embodiment of the present invention also provides link protocol ISLP frame compensated frame discriminating gear between a kind of system, is applied in encrypted speech business, and its structural representation as shown in figure 15, comprising:
Receiving element 1501, the ISLP frame the parsing that send for receiving network element, obtain user data wherein;
The 3rd determining unit 1502, in the time that the length of user data is less than 16bit, determines that the ISLP frame receiving is compensated frame; Wherein, compensated frame refers to: when frame losing appears in the ISLP frame of current transmission in encrypted speech business, network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, and according to compensated information, frame losing is compensated, the compensated frame of generation.
As can be seen from the above description, the present invention has realized following technique effect:
In the embodiment of the present invention, network element determines that frame losing appears in the ISLP frame of current transmission, determines compensated information according to the identifier of the ISLP frame of frame losing former frame, according to compensated information, frame losing is compensated, and generates compensated frame.The embodiment of the present invention adopts utilizes former frame ISLP frame identifier to compensate, ensure the continuity of 64kbps pcm stream and the stability of speed, and frame losing information correctly can be passed to encryption terminal, avoid as retransmitted former frame technology after existing frame losing, wrong content frame can be issued to encryption terminal, the deciphering of encrypting terminal is misled, and the embodiment of the present invention realizes simply simultaneously, can not produce extra load to system.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that multiple calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby they can be stored in storage device and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or the multiple modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a link protocol ISLP frame frame losing processing method between system, is characterized in that, is applied in encrypted speech business, comprising: network element determines that frame losing appears in the ISLP frame of current transmission; And
Described network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, comprise: described network element is preserved last 8 bit of the ISLP frame of described frame losing former frame, described last 8 bit are cyclic deformation forms of 01111110, and described network element is determined the number of repetition N of described last 8 bit according to the frame length of described frame losing;
Described network element compensates frame losing according to described compensated information, generates compensated frame, comprising: described network element repeats described last 8 bit N time, constructs the compensated frame identical with the frame length of frame losing.
2. method according to claim 1, is characterized in that, the frame length of described frame losing is determined in the following manner: the frame length of described frame losing equals the product of the transmission rate of ISLP frame in packing time and described encrypted speech business.
3. method according to claim 1 and 2, is characterized in that, described network element also comprises: described compensated frame is transferred to other network nodes after generating compensated frame.
4. a link protocol ISLP frame compensated frame method of discrimination between system, is characterized in that, is applied in encrypted speech business, comprising:
Network node receives ISLP frame the parsing that network element sends, and obtains user data wherein;
In the time that the length of described user data is less than default thresholding, described network node determines that the ISLP frame receiving is compensated frame;
Wherein, described compensated frame refers to: when in described encrypted speech business, frame losing appears in the ISLP frame of current transmission, described network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, and according to described compensated information, frame losing is compensated, the compensated frame of generation;
Wherein, described network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, comprise: described network element is preserved last 8 bit of the ISLP frame of described frame losing former frame, described last 8 bit are cyclic deformation forms of 01111110, and described network element is determined the number of repetition N of described last 8 bit according to the frame length of described frame losing; Described network element compensates frame losing according to described compensated information, generates compensated frame, comprising: described network element repeats described last 8 bit N time, constructs the compensated frame identical with the frame length of frame losing.
5. a link protocol ISLP frame frame losing processing unit between system, is characterized in that, is applied in encrypted speech business, comprising:
, there is frame losing for the ISLP frame of determining current transmission in the first determining unit;
The second determining unit, for determining compensated information according to the identifier of the ISLP frame of frame losing former frame;
Compensating unit, for according to described compensated information, frame losing being compensated, generates compensated frame;
Wherein, described the second determining unit comprises: preserve subelement, for preserving last 8 bit of ISLP frame of described frame losing former frame, described last 8 bit are cyclic deformation forms of 01111110; Determine subelement, for determine the number of repetition N of described last 8 bit according to the frame length of described frame losing;
Described compensating unit also for: described last 8 bit are repeated N time, construct the compensated frame identical with the frame length of frame losing.
6. device according to claim 5, is characterized in that, described definite subelement also for: determine that the frame length of described frame losing equals the product of the transmission rate of packing time and described encrypted speech business ISLP frame.
7. according to the device described in claim 5 or 6, it is characterized in that, also comprise: transmission unit, for described compensated frame is transferred to other network nodes.
8. a link protocol ISLP frame compensated frame discriminating gear between system, is characterized in that, is applied in encrypted speech business, comprising:
Receiving element, the ISLP frame the parsing that send for receiving network element, obtain user data wherein;
The 3rd determining unit, while presetting thresholding, determines that the ISLP frame receiving is compensated frame for being less than when the length of described user data; Wherein, described compensated frame refers to: when in described encrypted speech business, frame losing appears in the ISLP frame of current transmission, described network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, and according to described compensated information, frame losing is compensated, the compensated frame of generation; Wherein, described network element is determined compensated information according to the identifier of the ISLP frame of frame losing former frame, comprise: described network element is preserved last 8 bit of the ISLP frame of described frame losing former frame, described last 8 bit are cyclic deformation forms of 01111110, and described network element is determined the number of repetition N of described last 8 bit according to the frame length of described frame losing; Described network element compensates frame losing according to described compensated information, generates compensated frame, comprising: described network element repeats described last 8 bit N time, constructs the compensated frame identical with the frame length of frame losing.
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| CN201010556569.8A CN102480760B (en) | 2010-11-23 | 2010-11-23 | Intersystem link protocol frame dropping processing and frame-compensating distinguishing method and device |
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| CN201010556569.8A Active CN102480760B (en) | 2010-11-23 | 2010-11-23 | Intersystem link protocol frame dropping processing and frame-compensating distinguishing method and device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3872430A (en) * | 1973-11-23 | 1975-03-18 | Paul Emile Boudreau | Method and apparatus of error detection for variable length words using a polynomial code |
| CN1989548A (en) * | 2004-07-20 | 2007-06-27 | 松下电器产业株式会社 | Audio decoding device and compensation frame generation method |
| CN101399636A (en) * | 2008-09-04 | 2009-04-01 | 华为技术有限公司 | Method for packet loss compensation, device and system implementing packet loss compensation |
| CN101471073A (en) * | 2007-12-27 | 2009-07-01 | 华为技术有限公司 | Package loss compensation method, apparatus and system based on frequency domain |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3872430A (en) * | 1973-11-23 | 1975-03-18 | Paul Emile Boudreau | Method and apparatus of error detection for variable length words using a polynomial code |
| CN1989548A (en) * | 2004-07-20 | 2007-06-27 | 松下电器产业株式会社 | Audio decoding device and compensation frame generation method |
| CN101471073A (en) * | 2007-12-27 | 2009-07-01 | 华为技术有限公司 | Package loss compensation method, apparatus and system based on frequency domain |
| CN101399636A (en) * | 2008-09-04 | 2009-04-01 | 华为技术有限公司 | Method for packet loss compensation, device and system implementing packet loss compensation |
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