CN100459710C - All first packet transmitting method in data stream compression - Google Patents
All first packet transmitting method in data stream compression Download PDFInfo
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Abstract
The method comprises: when the compressing end triggers a process of transmitting the whole head packet, the data transmitting unit in the compressing end transmits the whole head packet to the decompressing end; each time the compressing end receives the whole head packet, it returns a confirmation message to the confirmation message processing unit of the compressing end; the confirmation message processing unit of the compressing end transmits a confirmation message to the data transmitting unit according to the confirmation message from the decompressing end; each time the data transmitting unit of the compressing end receives the confirmation message from the confirmation processing unit of the compressing end, it decide if the decompressing end successfully receives the whole head packet; if yes, ending the process of transmitting the whole head packet, and waiting to next transmitting process; if not, retransmitting the whole head packet to the receiving end of the decompressing end.
Description
Technical field
The present invention relates to the data flow head compression technology of mobile communication system, particularly complete packet transmission method in the compression of mobile communication system data flow head.
Background technology
Along with Internet fast development, the scale that the video data stream business of widely used internet protocol-based (IP) on the Internet/UDP (UDP)/real-time transport protocol (rtp) is used in WCDMA/ GPRS (GPRS)/CDMA 2000 mobile communication system such as (CDMA 2000) is also enlarging day by day.Characteristics at wireless channel and IP agreement, mobile communication system such as WCDMA/GPRS/CDMA 2000 have been introduced a kind of IP-based head compression method, and this method adopts different compression mechanisms at transmission control protocol (TCP) data flow with non-TCP (NON-TCP) data flow.Wherein, a compression mechanism that adopts for the NON-TCP data flow is: compression end at first sends a full head package, and then sends compressed package.Here, only comprise the field that changes in the data packet head of described compressed package, thereby decompressor end is recovered raw data packets again according to the field information of the compressed package of receiving and the field information of full head bag.
At the full head bag process of transmitting that compression end triggered, prior art has proposed two kinds of schemes: one, proposed the method that a kind of compression end periodically sends full head bag among the RFC2507; Two, 3GPP 25323 has proposed a kind of improving one's methods on the basis of RFC2507, the data transmission unit of compression end periodically sends full head bag, the affirmation message that the affirmation message processing unit of compression end returns according to decompressor end, the assembling acknowledge message also sends to the data transmission unit of compression end, the data transmission unit real-time judge of this compression end is from the affirmation message of the affirmation message processing unit of compression end: if the bright decompressor end of affirmation message table that receives has successfully received Quan Toubao, then dwelling period sends full head bag.
Wherein, when the data transmission unit of compression end receives the packet of current business link, when if the no change in the packet packet header (No Change) territory claims that again variation has taken place the field of key, then stop current full head bag process of transmitting, and trigger a new full head bag process of transmitting.Here, the packet header of the full head bag that sends in same full head bag process of transmitting is identical, and the packet header of the full head bag that sends in different full head bag process of transmittings is then different.For a full head package process of transmitting, because the packet header of the full head package that sends is identical, then after as long as decompressor end correctly receives a full head package, just can guarantee before this full head package process of transmitting stops, all compressed packages of the follow-up reception of decompressor end all can correctly recover, the effect that realizes when therefore, using above-mentioned prior art scheme is unsatisfactory.
In the full head bag process of transmitting of WCDMA, described compression end is radio resource controller (RNC), and described decompressor end is subscriber equipment (UE).The data transmission unit of described compression end is PDCP (PDCP) layer among the RNC, mainly finishes the head compression of IP packet; The affirmation message processing unit of described compression end is radio link control (RLC) layer among the RNC, mainly finish data sectional, restructuring, encryption and transfer function, and to monitoring and be assembled into the PDCP layer that new affirmation message is uploaded to RNC from the affirmation message of UE.Take the WCDMA system as example, the problem that prior art occurs is set forth below:
At first, if use above-mentioned first kind of scheme, finally can receive full head package although can guarantee UE, the compressed package of de-compression failure is recovered.But the characteristics of wireless network are that bandwidth is little, use the full head package that this kind scheme will inevitably send great quantities of spare for a long time, cause bandwidth availability ratio lower.
Secondly, although having solved first kind of existing full head package of scheme to a certain extent, above-mentioned first scheme sends overfrequency, the problem that bandwidth availability ratio is low.But, sent in the situation that full head package loses in a large number current, the PDCP layer of RNC can not in time resend full head package, by the time the transmission cycle could send a full head package when arriving again, and owing to the transmission cycle of full head package is far longer than the time delay that UE returns acknowledge message, like this, in the process of waiting for the arrival of full head package transmission cycle, to have a large amount of compressed package de-compression failures, also will cause packet loss sharply to rise.
At present in the full head package process of transmitting of GPRS/CDMA 2000 systems, also there is the problem that occurs in the above-mentioned WCDMA system.As seen, an existing NON-TCP data flow compression mechanism can not be stabilized in bandwidth availability ratio and packet loss in the reasonable range simultaneously, thereby makes the data transmission quality instability of IP/UDP/RTP data service, can not bring the business experience of high-quality to the user.
Summary of the invention
In view of this, main purpose of the present invention is to provide the full head package sending method in a kind of data flow head compression, makes the transmission of full head package needn't take too many bandwidth resources, and can guarantee lower packet loss, thereby improve on the whole data transmission quality.
For achieving the above object, technical scheme of the present invention is achieved in that
Full head package sending method in a kind of data flow head compression, when compression end triggered the full head package process of transmitting of non-transmission control protocol non-TCP compressive flow, this method comprised:
The data transmission unit of compression end sends full head package to decompressor end by the default transmission cycle, when decompressor end receives full head package at every turn, returns the affirmation message processing unit that acknowledge message is given compression end;
The affirmation message processing unit of compression end sends an acknowledgement message to the data transmission unit of compression end according to the affirmation message from decompressor end;
When the data transmission unit of compression end receives from the affirmation message of the affirmation message processing unit of compression end at every turn, judge according to this acknowledge message: if decompressor end successfully receives full head package, then finish current full head package process of transmitting, wait next full head package process of transmitting to be triggered; If decompressor end receives the full head package failure, then resend full head package to decompressor end.
Wherein, the described full head package that resends is to the decompressor end, and this method further comprises: record the current full head package that takes defeat, add up the number of all full head packages that taken defeat; Judge whether all full head package numbers that taken defeat that described statistics obtains reach the thresholding that resends that sets in advance, and if so, resend full head package to decompressor end, and again add up the full head package number that takes defeat; Otherwise finish the processing to the affirmation message of current reception, proceed the processing to the affirmation message of reception next time.
Wherein, described full head package all is assigned the packet index for sign full head package sending order;
The method of the current full head package that takes defeat of described record is: the packet index of the current full head package that takes defeat that comprises in the registration confirmed message;
The method of all full head package numbers that taken defeat of described statistics is: add up the number of the packet index of all full head packages that take defeat that recorded, obtain the full head package number that all have taken defeat.
Wherein, the described full head package that resends is to the decompressor end, and this method further comprises: record the current full head package that takes defeat; Judge that whether all full head packages that sent all take defeat, and if so, resend full head package to decompressor end; Otherwise finish the processing to the affirmation message of current reception, proceed the processing to the affirmation message of reception next time.
Wherein, described full head package all is assigned the packet index for sign full head package sending order;
The method of the current full head package that takes defeat of described record is: the packet index of the current full head package that takes defeat that comprises in the registration confirmed message;
The described method of judging whether all full head packages that sent all take defeat is: whether the packet index of judging the full head package that takes defeat that all have recorded is the packet index of all full head packages that sent.
Wherein, when compression end triggered the full head package process of transmitting, this method further comprised: the data transmission unit real-time servicing full head package state value of compression end, and when the compression end transmit leg at first sent full head package to decompressor end, putting this full head package state value was wait acknowledge;
Described judge that according to acknowledge message decompressor end successfully receives full head package after, further comprise: the data transmission unit of compression end is set to the described full head package state value of self maintained to be confirmed successfully, again according to the full head package state value for to confirm successfully, finish current full head package process of transmitting, wait next full head package process of transmitting to be triggered;
Described judge that according to acknowledge message decompressor end receives the full head package failure after, further comprise: the data transmission unit of compression end is set to the affirmation failure with the described full head package state value of self maintained, fail for confirming according to the full head package state value again, resend full head package to decompressor end, putting described full head package state value is wait acknowledge again.
Wherein, described compression end and decompressor end are the entity in the Wideband Code Division Multiple Access (WCDMA) WCDMA system; Described compression end is radio resource controller RNC, and the data transmission unit of described compression end is the PDCP PDCP layer among the RNC, and the affirmation message processing unit of described compression end is the radio link control rlc layer among the RNC.
Wherein, described compression end and decompressor end are the entity in the general packet radio service gprs system; Described compression end is universal grouping wireless business supporting node SGSN, and the data transmission unit of described compression end is that the subnet among the SGSN relies in conjunction with agreement SNDCP layer, and the affirmation message processing unit of described compression end is the logic link control LLC layer among the SGSN.
Can be found out that by such scheme key of the present invention is: the data transmission unit of compression end at first sends full head package to decompressor end; When the data transmission unit of compression end receives from the affirmation message of the affirmation message processing unit of compression end, receive the full head package failure if this acknowledge message shows decompressor end at every turn, then resend full head package to decompressor end; If this acknowledge message shows the decompressor end full head package and receives successfully, then finish current full head package process of transmitting, wait next full head package process of transmitting to be triggered.
Therefore, complete packet transmission method in the data flow head compression provided by the present invention, needn't take the full head bag of long time transmission, improve bandwidth availability ratio on the whole, the more important thing is, owing to can make decompressor end successfully receive full head bag as early as possible, therefore greatly reduce the packet loss of current business link, the transmission quality of current business packed data stream is significantly improved.
Description of drawings
Fig. 1 is the handling process schematic diagram that data flow sends part in the inventive method one preferred embodiment;
Fig. 2 is the handling process schematic diagram of acknowledge message receiving unit in the preferred embodiment shown in Figure 1;
Fig. 3 is the handling process schematic diagram that data flow sends part in another preferred embodiment of the inventive method;
Fig. 4 is the handling process schematic diagram of acknowledge message receiving unit in another preferred embodiment shown in Figure 3.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The invention discloses the full head package sending method in a kind of data flow head compression, for the full head package process of transmitting that compression end triggers, the main processing thought of this method is as follows: the data transmission unit of compression end sends full head package to decompressor end; The affirmation message processing unit of compression end returns the acknowledge message assembling and sends acknowledge message to the data transmission unit of compression end according to decompressor end again, when the data transmission unit of compression end receives from the affirmation message of compression end acknowledge message processing unit at every turn, judge according to acknowledge message: if decompressor end successfully receives full head package, then stop current full head package process of transmitting; If decompressor end receives the full head package failure, then resend full head package to decompressor end.
The inventive method can be used the system that RFC2507 is suitable for, and comprising: WCDMA, GPRS and CDMA 2000 etc. are that example is illustrated the embodiment of the invention with the WCDMA system below.When the present invention was applied to the WCDMA system, described compression end and decompressor end referred to RNC and UE usually respectively, also may be other entity, and the present invention does not limit; The data transmission unit of described compression end is the PDCP layer of compression end, and the affirmation message processing unit of described compression end is the rlc layer of compression end.
Wherein, rlc layer can adopt three kinds of mode of operations: affirmation mode (AM), Unacknowledged Mode (UM) and transparent mode (TM), but only under the AM mode of operation, the rlc layer of decompressor end receives from just returning acknowledge message to compression end behind the packet of compression end.This acknowledge message at first sends to the rlc layer of compression end, and the rlc layer of this compression end is dressed up the PDCP layer that new affirmation information and sending is given compression end according to the affirmation message groups that receives then.The PDCP layer of compression end can be according to judging from the affirmation message of compression end rlc layer whether decompressor end has successfully received packet then.Full head package process of transmitting when therefore, the inventive method is applied to rlc layer employing AM pattern.Here, described packet refers to: full head bag and compressed package.
Because above-mentioned decompressor end receives packet and returns acknowledge message and the processing of reception of the rlc layer of compression end and assembling acknowledge message, the non-problem that the present invention relates to.Therefore, this paper receives packet to decompressor end and returns acknowledge message and the rlc layer of compression end receives and the processing of assembling acknowledge message does not elaborate, and only the full head bag to the PDCP layer of compression end sends, the PDCP layer of compression end and the processing of the affirmation message between the rlc layer be elaborated.Be simplified characterization, below with the PDCP layer of compression end referred to as the PDCP layer, with the rlc layer of compression end referred to as rlc layer.
Based on the main processing thought of the invention described above, two kinds of preferred embodiments of the inventive method have been proposed below.Because, two parts relevant with the full head package process of transmitting among the present invention are treated to: acknowledge message receiving unit and data flow send part, two parts are processed parallel carrying out, therefore, below by illustrating that respectively this two-part processing is described in detail the inventive method.
Fig. 1 is the handling process schematic diagram that data flow sends part in the inventive method one preferred embodiment.As shown in Figure 1, the concrete processing comprises:
Step 101:PDCP layer sends packed data stream, at first sending first full head wraps to rlc layer, then for being somebody's turn to do complete the packet index that is responsible for assigning, and with the packet index record that distributed in pre-configured full head bag index list, it is wait acknowledge that full head bag state value is set in the PDCP layer at last.
Wherein, the PDCP layer is used for the packet index of identification data packet sending order for each allocation of packets when sending packet, and the packet index that is distributed is sent to rlc layer together with packet, and described packet comprises: full head bag and compressed package.The PDCP layer will distribute a full head bag index list when initialization, be used to write down complete packet index that wraps of institute's subject to confirmation.After the affirmation message that receives from rlc layer, the PDCP layer will discharge the packet index of the full head bag of this acknowledge message correspondence in this full head bag index list.
In addition, described full head package state value is by PDCP layer real-time servicing: when sending first full head package, namely in step 101, putting this full head package state value is wait acknowledge, and indication needs the affirmation of waiting for that full head package receives.When the affirmation message that receives from rlc layer, to make amendment to this full head package state value according to the indication of acknowledge message, if this message indication full head package receives successfully, then this state value is set to and confirms successfully, if this message indication full head package takes defeat, then this state value is set to and confirms failure, concrete processing will be described in detail in Fig. 2.
Whether step 102: judging currently has packet to send, if, execution in step 103; Otherwise the data flow that finishes the current business link sends.
Step 103: judge current full head package state value: if wait acknowledge, then execution in step 104; If confirm failure, then execution in step 105; If confirm successfully, then execution in step 106.
Step 104: send a compressed package to rlc layer, for this compressed package distributes a packet index, return step 102.
Step 105: send a full head package to rlc layer, and be this full head package distribute data bag index, putting the full head package state value is wait acknowledge, returns step 102.
Step 106: send a compressed package to rlc layer, for this compressed package distributes a packet index.
Step 107: judged whether that packet will send, if return step 106; Otherwise the data flow that finishes the current business link sends.
Wherein, rlc layer described in this paper embodiment is the rlc layer of compression end, when the PDCP layer of compression end sends packet, at first packet is sent to the rlc layer of compression end, the rlc layer of this compression end is sent to packet the rlc layer of decompressor end again, because the process of transmitting from the compression end rlc layer to the decompressor end rlc layer belongs to known technology, and non-problem solved by the invention, therefore be not described further.
Processing from described step 106 to step 107 as seen, when the full head package state value is when confirming successfully, the packet of the follow-up transmission of PDCP layer is compressed package, and before stopping at the transmission packet full head package state value is judged, that is to say the current full head package process of transmitting that is through with.When having triggered a new full head bag process of transmitting, the PDCP layer also will be again carries out the processing that data flow sends part by Fig. 1 is described.
Though, full head bag state value is not revised as other value from wait acknowledge among Fig. 1, but in the processing of following acknowledge message receiving unit shown in Figure 2, then may make amendment to full head bag state value, and separate, the executed in parallel of the processing of Fig. 1 and Fig. 2, therefore, among Fig. 1, full head bag state value might be for confirming success or confirming failure.
Fig. 2 is the handling process schematic diagram of acknowledge message receiving unit in the preferred embodiment shown in Figure 1.As shown in Figure 2, the concrete processing comprises:
Step 201:PDCP layer judges whether to receive the affirmation message from rlc layer, if then execution in step 202; Otherwise re-execute step 201, thereby continue the affirmation message of monitoring from rlc layer.
Step 202: judge according to the described acknowledge message of step 201 whether this message indicates rlc layer successfully to receive Quan Toubao, if, execution in step 204; Otherwise execution in step 203.
Here, each acknowledge message is carried the index of packet, therefore at least with packet of correspondence in the described acknowledge message, whether what can judge this message correspondence according to the packet index in the acknowledge message is full head bag, and knows that this full head bag receives successfully or takes defeat.
In addition, after the affirmation message that receives full head bag, the PDCP layer also will discharge complete packet index that wraps of current the reception successfully of this acknowledge message correspondence/fail etc.
Step 203: put the full head package state value for confirming failure, return step 201.
Step 204: discharge the information of the successful full head package of this reception, and the full head package state value is set to confirms that successfully the indication full head package successfully receives.
Wherein, the rlc layer described in this paper embodiment is the rlc layer of compression end, the actual rlc layer that derives from decompressor end of the affirmation message that the compression end rlc layer returns.When the rlc layer of decompressor end receives packet, at first return the rlc layer that confirms message to compression end, the rlc layer of this compression end is adorned the rlc layer that PDCP layer that new affirmation message sends to compression end is sent to packet decompressor end according to the affirmation message groups that receives again, because the processing of affirmation message transmitting process from the decompressor end rlc layer to the compression end rlc layer and compression end rlc layer assembling acknowledge message belongs to known technology, and therefore non-problem solved by the invention is not described further.
Among Fig. 2, when acknowledge message indication full head package takes defeat, the full head package state value is set to the affirmation failure, thereby in the described data flow process of transmitting of Fig. 1, the full head package state value PDCP layer of failing according to this affirmation will resend full head package to rlc layer; When acknowledge message indication full head package receives successfully, the full head package state value is set to confirms successfully, thereby in the described data flow process of transmitting of Fig. 1, the full head package state value PDCP layer successful according to this affirmation will no longer send full head package to rlc layer, current full head package process of transmitting is through with, until trigger a new full head package process of transmitting, the PDCP layer just can begin to send new full head package to rlc layer.
Among the above-mentioned embodiment illustrated in figures 1 and 2, the PDCP layer needn't wait for that the transmission cycle of length sends full head package, just again sends full head package when full head package takes defeat.Like this, the PDCP layer can in time be retransmitted full head bag, makes rlc layer successfully receive Quan Toubao as early as possible, realizes decompression, thereby the situation of having avoided occurring in the prior art of all compressed package de-compression failures in the transmission cycle reduces the packet loss on the current business link greatly; Simultaneously, the PDCP layer need not the long-term full head bag that sends, and has also improved bandwidth availability ratio to a certain extent.
Another preferred embodiment provided by the present invention sends on the basis of full head package in the described periodicity of prior art, further when all full head packages that sent all take defeat, also resends full head package.Below in conjunction with Fig. 3 and Fig. 4 this another preferred embodiment is described in detail.
Fig. 3 sends handling process schematic diagram partly for data flow in another preferred embodiment of the present invention, and as shown in Figure 3, the concrete processing comprises:
Step 301:PDCP layer sends compressed data stream, at first sends first full head package to rlc layer, is this full head package distribute data bag index, and this full head package state value is set to wait acknowledge.
In the present embodiment, the PDCP layer also will be each allocation of packets packet index when sending packet, and the full head bag of real-time servicing state value, the concrete implication of described packet index and full head bag state value is described identical with a last embodiment with value, no longer explanation here.
Step 302: judged whether that packet will send, if, execution in step 303; Otherwise the data flow that finishes the current business link sends.
Step 303: judge whether to arrive the transmission cycle that sets in advance, if, execution in step 304; Otherwise execution in step 305.
Here, will start timer when the PDCP layer begins to send the data flow of current business link, and set in advance the transmission cycle of this length of timer as full head bag, when timer arrived this duration, then explanation had arrived the transmission cycle of full head bag.
Wherein, send the dual mode that is provided with in cycle: one, fixing transmission cycle of duration, such as: be set for every full head package of transmission in 5 seconds the transmission cycle; Two, press the transmission cycle of exponential increase, such as: be set since 1 the transmission cycle, and increase with 2 n power, send a full head package after just sending 1 compressed package, send a full head package after sending again 2 compressed packages, send again and send a full head package behind 4 compressed packages, send a full head package after sending subsequently 8 compressed packages ..., and by that analogy.How to arrange about the transmission cycle, have a detailed description in the middle of agreement, so the present invention do not limit, this paper no longer describes in detail.
Step 304: send a full head package, and be this full head package distribute data bag index, return step 302.
Step 305: judge the full head package state value: if be wait acknowledge, then execution in step 306; If for confirming failure; Then execution in step 307; If for to confirm successfully, then execution in step 308.
Step 306: send a compressed package to rlc layer, and be this compressed package distribute data bag index, return step 302.
Step 307: send a full head package to rlc layer, and be this full head package distribute data bag index, putting then described full head package state value is wait acknowledge, returns step 302.
Step 308: send a compressed package to rlc layer, and be this compressed package distribute data bag index.
Step 309: judged whether that packet will send, if return step 308; Otherwise the data flow that finishes the current business link sends.
Processing from described step 308 to step 309 as seen, when the full head package state value is when confirming successfully, the packet of the follow-up transmission of PDCP layer is compressed package, and stop to send before the packet and the full head package state value judged and send the processing of full head package by the transmission cycle, that is to say the current full head package process of transmitting that is through with.When having triggered a new full head package process of transmitting, the PDCP layer also will send processing partly by the described data flow of carrying out of Fig. 3 again, it should be noted that: also will will reset for the timer that is carried out timing the transmission cycle, thereby beginning sends full head package by the transmission cycle again.
As seen described by Fig. 3, present embodiment not only when the full head package state value is failed for affirmation, resends a full head package, and also sends a full head package during cycle in the arrival transmission; In addition, when confirming successfully, transmission compressed package, and no longer judge the full head package state value during follow-up transmission packet only sends compressed package, until trigger a new full head package process of transmitting at the full head package state value.Though, among Fig. 3 and for full head bag state value is revised as other value from wait acknowledge, but in the processing of following acknowledge message receiving unit shown in Figure 4, then may make amendment to full head bag state value, and separate, the executed in parallel of the processing of Fig. 3 and Fig. 4, therefore, among Fig. 3, full head bag state value might be for confirming success or confirming failure.
Fig. 4 is the handling process schematic diagram of acknowledge message receiving unit in another preferred embodiment shown in Figure 3.As shown in Figure 4, the concrete processing comprises:
Step 401:PDCP layer judges whether to receive the affirmation message from rlc layer, if then execution in step 402; Otherwise re-execute step 401, thereby continue the affirmation message of monitoring from rlc layer.
Step 402: judge according to the described acknowledge message of step 401 whether this message indicates rlc layer successfully to receive Quan Toubao, if, execution in step 405; Otherwise execution in step 403.
Step 403: judge whether that all full head bags that sent all take defeat, if, execution in step 404; Otherwise execution in step 401.
Because, the PDCP layer has been preserved the packet index of all full head packages that sent, the affirmation message that rlc layer returns will be carried the packet index of full head package corresponding to this message, the PDCP layer whenever receive the indication full head package take defeat affirmation message the time, will the record the current full head package that takes defeat the packet index.Therefore, in this step,, can adjudicate whether all full head bag rlc layers that sent all take defeat according to the packet index of the full head bag that takes defeat that is write down.
In addition, the PDCP layer whenever receive the indication full head package take defeat affirmation message the time, except recording the packet index of the current full head package that takes defeat, can also add up the number of the packet index of the full head package that records, obtain the number of the current full head package that has taken defeat.Therefore, the described judgement of this step also can for: judge whether the current full head bag number that has taken defeat reaches the thresholding that resends that sets in advance, if, execution in step 404; Otherwise execution in step 401.Here, the described common basis of the threshold value emulation experiment in advance that resends obtains, and the present invention does not limit the concrete value that this resends thresholding.
Step 404: put the full head package state value for confirming failure, return step 401.
Step 405: the full head package state value is set to confirms successfully, the indication full head package successfully receives, and discharges the information such as packet index of the successful full head package of this reception.
Among Fig. 4, when acknowledge message indication full head package takes defeat, if adjudicating the number of the full head package that all full head packages that sent all take defeat or taken defeat reaches and resends thresholding, then the full head package state value is set to and confirms failure, thereby in the described data flow process of transmitting of Fig. 3, the full head package state value PDCP layer of failing according to this affirmation will resend full head package to rlc layer; When acknowledge message indication full head package receives successfully, the full head package state value is set to confirms successfully, thereby in the described data flow process of transmitting of Fig. 3, the full head package state value PDCP layer successful according to this affirmation will no longer send full head package to rlc layer, and stop to send full head package by the transmission cycle, the current full head package process of transmitting that is through with, until trigger a new full head package process of transmitting, the PDCP layer just can begin to send new full head package to rlc layer.
According to the processing of Fig. 3 and described another preferred embodiment of Fig. 4 as seen, when the PDCP layer is wait acknowledge at the full head package state value, send full head package to rlc layer by the transmission cycle that sets in advance, when the full head package state value is failed for affirmation, also will send full head package to rlc layer.According to agreement regulation, the default value that full head package sends the cycle is 5 seconds, and the time delay default value of the affirmation message of rlc layer is 250 milliseconds, and it is too very long that then full head package sends the time delay that the cycle returns with respect to acknowledge message.Therefore, when the number that takes defeat at the Quan Toubao that has sent reaches and resends thresholding or full head bag that all have sent and all take defeat, just be necessary very much before the transmission cycle arrives, in time to reissue a full head bag, thereby make rlc layer successfully receive full head bag early, to avoid losing of in the wait process in very long transmission cycle a large amount of compressed packages.
In sum, use the inventive method, the PDCP layer of compression end can in time send full head where necessary and wrap to decompressor end, reduce the bandwidth usage of full head bag, make decompressor end receive Quan Toubao as early as possible, successfully compressed package be carried out decompression, packet loss on the current business link is remained on reduced levels, guarantee the transmission quality of packed data stream.
The inventive method can also be applied to GPRS and CDMA 2000 systems, and then described compression end can refer to universal grouping wireless business supporting node (SGSN) in the gprs system or the packet data serving node (PDSN) in the CDMA2000 system usually.When being applied to gprs system, the data transmission unit of compression end is that the subnet of SGSN relies in conjunction with agreement (SNDCP) layer, and the affirmation message processing unit of compression end is logic link control (LLC) layer of SGSN.
Because, can not get rid of a kind of possibility, be exactly: present or following in other GSM and between other compression end and the decompressor end entity, also exist and a similar data flow compression mechanism described herein, the present invention should be equally applicable to have other GSM and other compression end and the decompressor end entity of a described similar data flow compression mechanism, therefore, the present invention does not limit the data transmission unit of described compression end, which kind of entity is affirmation message processing unit and the decompressor end of compression end be specially.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (8)
1, the full head package sending method in a kind of data flow head compression is characterized in that when compression end triggered the full head package process of transmitting of non-transmission control protocol non-TCP compressive flow, this method comprised:
The data transmission unit of compression end sends full head package to decompressor end by the default transmission cycle, when decompressor end receives full head package at every turn, returns the affirmation message processing unit that acknowledge message is given compression end;
The affirmation message processing unit of compression end sends an acknowledgement message to the data transmission unit of compression end according to the affirmation message from decompressor end;
When the data transmission unit of compression end receives from the affirmation message of the affirmation message processing unit of compression end at every turn, judge according to this acknowledge message: if decompressor end successfully receives full head package, then finish current full head package process of transmitting, wait next full head package process of transmitting to be triggered; If decompressor end receives the full head package failure, then resend full head package to decompressor end.
2, method according to claim 1 is characterized in that, describedly resends full head and wraps to the decompressor end, and this method further comprises: write down the current Quan Toubao that takes defeat, add up the number that all full heads that taken defeat wrap; Judge whether all full head bag numbers that taken defeat that described statistics obtains reach the thresholding that resends that sets in advance, if resend full head and wrap, and add up the full head bag number that takes defeat again to decompressor end; Otherwise finish processing, proceed processing the affirmation message of reception next time to the affirmation message of current reception.
3, method according to claim 2 is characterized in that, described complete Bao Jun is assigned the packet index that is used to identify full head bag sending order;
The method of the current full head package that takes defeat of described record is: the packet index of the current full head package that takes defeat that comprises in the registration confirmed message;
The method of all full head package numbers that taken defeat of described statistics is: add up the number of the packet index of all full head packages that take defeat that recorded, obtain the full head package number that all have taken defeat.
According to the professional 1 described method of right, it is characterized in that 4, the described full head package that resends is to the decompressor end, this method further comprises: record the current full head package that takes defeat; Judge that whether all full head packages that sent all take defeat, and if so, resend full head package to decompressor end; Otherwise finish the processing to the affirmation message of current reception, proceed the processing to the affirmation message of reception next time.
5, method according to claim 4 is characterized in that, described complete Bao Jun is assigned the packet index that is used to identify full head bag sending order;
The method of the current full head package that takes defeat of described record is: the packet index of the current full head package that takes defeat that comprises in the registration confirmed message;
The described method of judging whether all full head packages that sent all take defeat is: whether the packet index of judging the full head package that takes defeat that all have recorded is the packet index of all full head packages that sent.
6, according to each described method of claim 1 to 5, it is characterized in that, when compression end triggers complete bag process of transmitting, this method further comprises: the full head bag of the data transmission unit real-time servicing of compression end state value, when the compression end transmit leg at first sent full head and wraps to decompressor end, putting this full head bag state value was wait acknowledge;
Described judge that according to acknowledge message decompressor end successfully receives full head package after, further comprise: the data transmission unit of compression end is set to the described full head package state value of self maintained to be confirmed successfully, again according to the full head package state value for to confirm successfully, finish current full head package process of transmitting, wait next full head package process of transmitting to be triggered;
Described judge that according to acknowledge message decompressor end receives the full head package failure after, further comprise: the data transmission unit of compression end is set to the affirmation failure with the described full head package state value of self maintained, fail for confirming according to the full head package state value again, resend full head package to decompressor end, putting described full head package state value is wait acknowledge again.
According to each described method of claim 1 to 5, it is characterized in that 7, described compression end and decompressor end are the entity in the Wideband Code Division Multiple Access (WCDMA) WCDMA system; Described compression end is radio resource controller RNC, and the data transmission unit of described compression end is the PDCP PDCP layer among the RNC, and the affirmation message processing unit of described compression end is the radio link control rlc layer among the RNC.
According to each described method of claim 1 to 5, it is characterized in that 8, described compression end and decompressor end are the entity in the general packet radio service gprs system; Described compression end is universal grouping wireless business supporting node SGSN, and the data transmission unit of described compression end is that the subnet among the SGSN relies in conjunction with agreement SNDCP layer, and the affirmation message processing unit of described compression end is the logic link control LLC layer among the SGSN.
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| CN1311590A (en) * | 2000-03-03 | 2001-09-05 | 株式会社Ntt杜可莫 | Method and device for compacting masthead transmission data package |
| WO2003047189A1 (en) * | 2001-11-24 | 2003-06-05 | Lg Electronics Inc. | Selectively transmitting full or compressed header packets |
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