CN102282809B - Method and apparatus for improving header compression performance - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
Abstract
A method for improving header compression performance, which includes: obtaining a wireless channel quality information (1); adjusting the width of the sliding windows according to the obtained wireless channel quality information and a preset information (2); compressing the header of the data packet according to the adjusted width of the sliding windows, and transmitting the compressed data packet to the decompression end (3). Application of the technical solutions can realize the purposes that the wireless channel bandwidth resource is saved and the correct decompressing ability of the decompression end is improved.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of method and apparatus of a raising compression performance.
Background technology
Head compression technology is very important for the effect of communication technical field, can effectively reduce the valuable bandwidth resources that transfer of data takies, head compression technology mainly contains IP header-compressed (IPHC at present, IPHeader Compression), RTP head compression (CRTP, Compression ofRTP), the head compression (ROHC, Robust Header Compression) of robust.Wherein, ROHC technology is a kind of novel header compression mechanisms, compares with various mechanism in the past, and ROHC technology has the compression efficiency of good robustness and Geng Gao.
ROHC technology adopts the least significant bit compressed encoding (W-LSB based on window to changing regular dynamic letter header field in the header of packet, Windows-based Least Significant Bits Encoding) algorithm, this algorithm is the improvement of least significant bit compression (LBS, Least Significant Bits) algorithm.Adopt W-LSB algorithm in the time that compression end is encoded, be according to comprise in sliding window one group with reference to base value, encode; The value of any one base value that decompressor end receives sliding window after just can correct decompressed coding.Adopting W-LSB algorithm coding is the less header fields of changing value during encoding those wraps continuously, and after coding, transmission is the minimum k position of field value, and transmission is the header fields that changing value is less.
Adopt the concrete manner of execution of the compression end of W-LSB algorithm coding to comprise:
Steps A 1: compression end sends a value V for the first time to decompressor end, and compression end is added to value V in sliding window, wherein, compression end is when sending value V is to decompressor end for the first time, and sliding window is empty;
Steps A 2: compression end is to follow-up each compressed value v, compression end according to k=max (g (v_min, v), g (v_max, v), obtains k; Wherein, v_max and v_min are maximum and the minimum values of N reference value in sliding window, and function g (v) is the bit number that transmission value will transmit compared with a certain reference value.
Steps A 3: according to the k obtaining, v compresses to value, and transmit the value v after compression;
Steps A 4: compression end is according to the feedback of decompressor end, (or according to configuration of compression end self), judge specific value v in sliding window and all can decompressed end than the old value of v with for referencial use, value v and the old value of ratio v are removed to sliding window, the width of sliding window has just diminished accordingly.
Wherein, sliding window width is to evaluate to adopt the robustness of W-LSB algorithm coding and the important parameter of compression efficiency.In the time that sliding window is very little, on wireless channel, lose a small amount of grouping, will cause the subsequent transmission can not be successfully decompressed to the grouping of decompressor end; If sliding window is very large, the LSB coding figure place k of each compression domain will increase, and has reduced the efficiency of head compression.Therefore, said method also comprises:
Steps A 5: if compression end according to the feedback of decompressor end, this feedback normally decompressor end decompress error rate very high, compression end just increases sliding window width.
Use value that last decompression is successful as a reference in decompressor end, decompress.
In the research and practice process to prior art, the present inventor finds, the technology that existing employing W-LBS algorithm carries out head compression, in the time being used in changeable wireless channel environment, sliding window change width is dumb, cause having wasted bandwidth resources in the good situation of quality of wireless channel, in the situation that quality of wireless channel is poor, can not guarantee the accuracy that decompressor end decompresses.
Summary of the invention
The embodiment of the present invention provides a kind of method and apparatus of a raising compression performance, effectively solve in prior art sliding window change width dumb, cause having wasted bandwidth resources in the good situation of quality of wireless channel, in the situation that quality of wireless channel is poor, can not guarantee the problem of the accuracy of decompressor end decompression.
The embodiment of the present invention provides a kind of method of a raising compression performance, comprising:
Obtain quality of wireless channel information;
According to the described quality of wireless channel information of obtaining and preset information, adjust sliding window width;
According to adjust after sliding window width, the header of packet is compressed, by compression after Packet Generation to decompressor end.
The embodiment of the present invention also provides a kind of compression set, comprising: acquiring unit, adjustment unit, compression unit and transmitting element,
Described acquiring unit, for obtaining quality of wireless channel information;
Described adjustment unit, for the quality of wireless channel information obtained described in basis and preset information, adjusts sliding window width;
Described compression unit, for according to the sliding window width after adjusting, compresses the header of packet;
Described transmitting element, for by compression after Packet Generation to decompressor end.
The embodiment of the present invention is according to the quality of wireless channel information of obtaining, adjust sliding window width, according to the sliding window width after adjusting, the header of packet is compressed, by compression after Packet Generation to decompressor end, compression end can, according to quality of wireless channel, be adjusted after sliding window width, compress, improve efficiency of transmission, save wireless signal-path band width resource, meanwhile, improved the correct decompress(ion) ability of decompressor end.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of method flow sketch that improves a compression performance that the embodiment of the present invention one provides;
Fig. 2 is a kind of method flow sketch that improves a compression performance that the embodiment of the present invention two provides;
Fig. 3 is a kind of quality of wireless channel and the sliding window width corresponding diagram of giving an example in the embodiment of the present invention three;
Fig. 4 is a kind of compression set logic sketch of explanation in the embodiment of the present invention three;
Fig. 5 is a kind of method flow sketch that improves a compression performance that the embodiment of the present invention four provides;
Fig. 6 is a kind of compression set logic sketch that the embodiment of the present invention five provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of method of a raising compression performance, and the embodiment of the present invention also provides corresponding device.Below be elaborated respectively.
Embodiment mono-,
The embodiment of the present invention provides a kind of method of a raising compression performance, and shown in Figure 1, the method comprises:
Step 1: obtain quality of wireless channel information;
Wherein, it will be appreciated that, the representation of quality of wireless channel information can have multiple, conventionally can be with the ratio (CINR of carrier wave and interference noise, Carrier-to-Interference-and-Noise Ratio), signal to noise ratio (SNR, Signal to Noise Ratio), received signal strength indicator (RSSI, ReceivedSignal Indicator) wherein any one expression, for adopting HARQ (ARQ, Automatic Repeat Request) or mixed automatic retransfer request (HARQ, Hybrid AutomaticRepeat Request) technology, quality of wireless channel information also can represent by the accuracy of transmission data.Also it will be appreciated that, the representation of quality of wireless channel information can have multiple, and explanation herein should not be construed the restriction to the embodiment of the present invention.
Step 2: according to the quality of wireless channel information of obtaining and preset information, adjust compression end sliding window width;
Be convenient to the explanation of understanding, conventionally in the poor situation of quality of wireless channel, wider relatively and in the good situation of quality of wireless channel of the width of sliding window, need to increase the sliding window width of compression end to n, the bit number of corresponding transmission increases, corresponding, and the probability of the reference value that decompressor end is used in window increases, thereby the compressed package of decompress(ion) subsequent transmission that can be correct when more at packet loss or wrong bag, provides correct decompress(ion) ability.
In the good situation of quality of wireless channel, the width of sliding window is decreased to width m, after compression, the bit number of transmission is few, not only can improve efficiency of transmission, can also save wireless signal-path band width resource.
Also it should be noted that, width m and n are variable, and concrete value determines according to actual conditions.Compression end to the adjustment of sliding window width also can be specifically according to the division quantitative to quality of wireless channel, and sliding window width is divided into multiple different width.Illustrate referring to follow-up explanation embodiment.
Step 3: according to adjust after sliding window width, the header of packet is compressed, by compression after Packet Generation to decompressor end.
Wherein, in step 3 illustrate can be with reference to prior art.
If above-mentioned compression end is arranged in subscriber equipment, can think that said method carried out by subscriber equipment (as terminal).In the time that compression end is arranged in subscriber equipment, sometimes need to consult between ustomer premises access equipment and network side (normally network side base station) parameter about compression, as parameter: the threshold value X of bad channel quality, threshold value Y and/or channel quality proof cycle T etc. that channel quality is good.This negotiations process can be passed through user's basic capability negotiating (SBC), add/change of dynamic Service (DSA/DSC, Dynamic service addition/change), signaling such as registration (REG, registration) etc. completes.
By the explanation of above a kind of method that improves a compression performance that the embodiment of the present invention is provided, according to the quality of wireless channel information of obtaining, adjust sliding window width, according to the sliding window width after adjusting, header to packet compresses, by compression after Packet Generation to decompressor end, make the compression end can be according to quality of wireless channel, adjust after sliding window width, compress, improve efficiency of transmission, saved wireless signal-path band width resource, meanwhile, improved the correct decompress(ion) ability of decompressor end.
Embodiment bis-,
The embodiment of the present invention provides a kind of method of a raising compression performance, and the method is that the method providing take embodiment mono-is a basic more detailed implementation process.Before the method that the present embodiment is provided explains, it should be noted that, the executive agent of the method is ustomer premises access equipment, in this ustomer premises access equipment, includes compression end, shown in Figure 2, the method comprises:
Step H1: obtain the wherein any one parameter value such as up CINR, SNR or RSSI;
Wherein, ustomer premises access equipment can be according to the uplink scheduling information of network side transmission or according to the wherein any one data such as descending CINR, SNR or RSSI, estimates the wherein any one data such as up CINR, SNR or RSSI; Or directly receive the wherein any one data such as up CINR, SNR or RSSI from network side.
Also it will be appreciated that, in existing communication mechanism, what ustomer premises access equipment can be regular report descending CINR, SNR or RSSI etc. wherein any one data to network side.
For the ease of to describing, below explain as an example of CINR example in all word, the situation that quality of wireless channel represents with SNR or RSSI etc., with SNR or RSSI replacement CINR.
Step H2: according to wherein any one data and the preset information such as up CINR, SNR or RSSI of obtaining, adjust compression end sliding window width;
Wherein, said preset information in step H2, generally includes: the threshold value X of bad channel quality, the threshold value Y that channel quality is good, channel quality detection cycle T; In preset information, can also comprise: the occurrence of adjusting sliding window width.In preset information, can also comprise other parameters, should not be construed the restriction to the embodiment of the present invention herein.
Also it should be noted that, step H2 can specifically comprise:
Step h1: when the CINR value of obtaining is less than preset value X, according to preset information, compression end sliding window width is increased to n;
Wherein, n stipulates in preset information, and in the time that CINR value is less than X, window width increases to n, and the concrete value of n determines according to factors such as actual conditions and designer's requirements.When CINR value is less than X, illustrate that now quality of wireless channel is poor, the width of sliding window need to be increased, guarantee the accuracy of decompressor end decompress(ion).
Step h2: when the CINR value of obtaining is more than or equal to X and is less than or equal to Y, keep sliding window width constant;
Wherein, in the time of big or small between X and Y of CINR value, illustrate that current sliding window width is suitable, can guarantee the decompress(ion) accuracy of decompressor end, by there is no waste bandwidth resource, do not need to adjust.
Step h3: when the CINR value of obtaining is greater than Y, according to preset information, compression end sliding window width is decreased to m.
Wherein, m has similar explanation to the n in step h1, in the time that CINR value is greater than Y, illustrates that now quality of wireless channel is better, can dwindle window width, transmits less bit number, saves bandwidth resources.
Above step h1 to the explanation of step h3 be for decompressor end without feedback or feed back in less situation, subscriber equipment is according to the quality of quality of wireless channel, adjusts sliding window width in compression end.In fact, more reasonably adjust in the method for sliding window width in compression end, it is also conceivable that the feedback information of decompressor end, as: the accuracy of decompression or the wherein any one of error rate decompressing.
For the situation that has feedback, the method, before step H2, also will comprise:
Step H4: receive the described feedback information that decompressor end sends, described feedback information comprises NACK or the ACK feedback of described decompressor end to packet decompress(ion);
Step H5: according to feedback information, obtain the accuracy of decompression.
The method of specifically obtaining accuracy is prior art, does not describe in detail.For having in the situation of feedback in subsequent embodiment three, four, there is similar explanation, can be with reference to explanation herein.
Therefore, step H2 can also specifically comprise: according to up CINR, the SNR or the RSSI etc. that obtain, wherein any one data, preset information are conciliate compressing feedback information, adjustment compression end sliding window width.
In conjunction with above-mentioned steps h1 to step h3 to having in the situation of decompression feedback information, the concrete grammar of adjusting sliding window width explains, and comprising:
Step h ' 1: when the CINR value of obtaining is less than X, and the accuracy low (in like manner, error rate is high) decompressing, according to preset information, compression end sliding window width is increased to n;
Wherein, the judgement of the height of the accuracy of decompression (or, the height of error rate), can be specifically that accuracy is greater than Z and thinks high, be less than or equal to Z and think low, the value of Z be determined according to actual conditions, same X, Y, m, n are the same, are preset in compression end.
From step h ' 1, quality of wireless channel is poor, and the accuracy of decompressor end decompress(ion) is lower, and compression end is judged and need to be increased the accuracy that window width guarantees that decompressor end decompresses.
Step h ' 2: when the CINR value of obtaining is less than X, and the accuracy decompressing is high, keeps sliding window width constant;
Wherein, step h ' 2 explanations, in the situation that decompressor end decompression accuracy is higher, although quality of wireless channel is poor, do not need to increase window width yet, have saved bandwidth resources.
Step h ' 3: h2 is identical with step;
Step h ' 4: when the CINR value of obtaining is greater than Y, and the accuracy decompressing is low, keeps sliding window width constant;
Step h ' 5: when the CINR value of obtaining is greater than Y, and the accuracy decompressing is high, and according to preset information, compression end sliding window width is decreased to m.
Explanation (not showing in Fig. 2) by above step h ' 1 to step h ' 5, it is more reasonable to make the adjustment of sliding window width.Also need understand time, for this method of adjustment, step H1 specifically comprises: obtain the wherein any one data such as up CINR, SNR or RSSI, and obtain the feedback information of decompressor end.
Step H3: according to the window width changing after adjusting, packet header is compressed the Packet Generation after compression to decompressor end;
Wherein, before step H3 is illustrated, it will be appreciated that: in the head compression technology for ROHC agreement regulation, LSB compression algorithm is continuous separate class mean to be changed to continuous territory carry out compressed encoding, compression method just transmits k least significant bit bit (LSBs of thresholding, Least SignificantBits), rather than transmit original thresholding.To be the value v that will compress rectify true decompress(ion) and as the least significant bit of the binary coding difference with reference to value v-ref, k is the number of bits of LSBs with decompressed to LSBs.Decompressor end receives after LSBs, replaces previous correct reception and as k the least significant bit of the v-ref of decompress(ion) reference value with it, reduces compressed value.
In ROHC, packet format adopts type (type) mechanism at present, in ROHC, the form of packet has been done to corresponding restriction, select after certain type, the bit number of the information of its transmission is fixed, therefore, calculate the k obtaining and must be less than the bit number k1 transmitting in the packet format of selected type.
Based on above-mentioned conceptual explanation, below step H3 is illustrated:
Step t1: in the time that compression end sliding window width increases to n, according to window width, obtain least significant digit k ';
Step t2: according to current packet format type, the Bit data k1 that judges current packet format type transfers is more than or equal to k ', adopts current packet format type transfers data;
Step t3: according to current packet format type, the Bit data k1 that judges current packet format type transfers is less than k ', selects the bit number of transmission to be greater than the packet format type transfers data of k ';
Wherein, in the time having multiple selectable type in step t3, select transmitted bit minimum number, and the packet format type that is greater than k ' is transmitted.
Above-mentioned steps t1 is under the condition that sliding window width is increased to step t3, the subsequent treatment of compression end; Step t4 is under the condition that sliding window width is reduced to step t6 below, the subsequent treatment of compression end.
Step t4: t1 is similar to step, when compression end sliding window width is decreased to m, according to window width, obtains least significant digit k ";
Step t5: according to former packet format type transfers data.
Wherein, the k obtaining in step t4 " be obviously the bit number k1 that is less than former packet format type transfers, so can perform step the operation of t5, do not change packet format type.Certainly, also can transmit according to new packet format type, select the bit number of transmission to be more than or equal to k ", and the packet format type less than the bit number k1 of former packet format type transfers.
By the explanation of above a kind of method that improves a compression performance that the embodiment of the present invention is provided, according to the quality of wireless channel information of obtaining, adjust sliding window width, according to the sliding window width after adjusting, packet header is compressed, by compression after Packet Generation to decompressor end, make the compression end can be according to quality of wireless channel, adjust after sliding window width, compress, improve efficiency of transmission, saved wireless signal-path band width resource, meanwhile, improved the correct decompress(ion) ability of decompressor end.
Embodiment tri-,
The embodiment of the present invention provides a kind of method of a raising compression performance, and the method is similar to the method for implementing to provide in two, and difference is, in embodiment bis-, is a kind of simple rough process to the adjustment of sliding window width; And be meticulousr to the adjustment of sliding window width in the method that the present embodiment provides.
In the time that the method that the present embodiment is provided explains, just do not elaborate with embodiment something in common, mainly to embodiment bis-in the part of having any different illustrate.Difference in the method that the present embodiment provides and embodiment bis-is at the concrete operation step of step H2, and in the step H2 in embodiment bis-, by three parts that are divided into quantitative quality of wireless channel, quality of wireless channel is good, general, bad.In the time that CINR is greater than Y, quality of wireless channel is good; In the time that CINR is less than or equal to Y and is more than or equal to X, quality of wireless channel is general; In the time that CINR is less than X, quality of wireless channel is poor.Accordingly, the width of sliding window is divided into three kinds, comprising: keeping current sliding window width, width is that m and width are n.
And in the present embodiment, by quantitative quality of wireless channel being divided into more than three parts, during with this class Parametric Representation quality of wireless channel such as CINR, SNR, RSSI, can be according to each parameter the value on number axis, number axis is divided into the interval more than three, and the corresponding compression end sliding window of the unlimited channel quality broadband of the value representative in different intervals is different.Certainly principle is all that channel quality is better, and sliding window width is narrower.As shown in Figure 3, take CINR as example, CINR value is divided into 7 sections.CINR parameter value V≤A, corresponding sliding window width N1; A < V≤B, sliding window width N2; B < V≤C, sliding window width N3; C < V≤D, sliding window width N4; D < V≤E, sliding window width N5; E < V≤F, sliding window width N6; V > F, sliding window width N7, above is information preset in compression end to CINR division and corresponding sliding window width value.The concrete parameter value of CINR that in ustomer premises access equipment, compression end basis is obtained, and above-mentioned preset information, the width of compression end sliding window is done corresponding adjustment by ustomer premises access equipment.Also it should be noted that, similar about the explanation of step H2 to embodiment bis-, also can consider the feedback information of decompressor end to the adjustment of sliding window width, illustrate the explanation in can reference example two.
Also it should be noted that, in practical application, compression end is obtained quality of wireless channel information, specifically refer to obtain any one such as CINR, SNR or RSSI, the design parameter value of obtaining at different time is different, therefore, can be using quality of wireless channel in time T as the foundation of adjusting window width.Therefore, obtaining in the present embodiment quality of wireless channel information specifically comprises:
Step y1: in official hour T more than once obtain CINR parameter value;
Step y2: statistics CINR value in time T falls into the number in preset each interval;
The maximum interval of parameter value number that basis falls into, and preset information, select the sliding window width corresponding with this interval.If the interval that the parameter value falling into is maximum is more than one, the poorest interval of selective channel quality, as the foundation of adjusting sliding window width.
Above-mentioned explanation is take CINR as example, has identical method of operation for SNR, RSSI.
For the ease of understanding the above-mentioned explanation to step y1 and step y2, concrete example comprises: suppose that in time T subscriber equipment has the estimation of 10 CINR values, wherein, CINR value has and falls into 4 to 8dB interval 8 times, fall into-4 intervals to 0dB for 2 times, in subscriber equipment the interval of compression end using 4 to 8dB as the foundation of adjusting sliding window width.Another comprises for example: fall into 4 to 8dB interval 5 times as CINR parameter value has, fall into-4 for 5 times to 0dB, in subscriber equipment the interval of compression end using-4 to 0dB as the foundation of adjusting sliding window width.
Above-mentioned explanation is for the adjustment not having in the situation of decompressor end feedback information, and when decompressor end is when feeding back, the method for the adjustment sliding window width that compression end is concrete is as follows:
When the accuracy decompressing is greater than preset value Z, and the current numerical value that falls into the interval that parameter value number is maximum obtaining is greater than the numerical value that falls into the interval that parameter value number is maximum that the last time obtains, by sliding window width adjustment to the interval corresponding sliding window width maximum with the described described parameter value number falling into;
When the accuracy decompressing is less than or equal to preset value Z, and the current numerical value that falls into the interval that parameter value number is maximum obtaining is less than the numerical value that falls into the interval that parameter value number is maximum that the last time obtains, by sliding window width adjustment to the interval corresponding sliding window width maximum with the described described parameter value number falling into;
When the accuracy decompressing is greater than preset value Z, and the current numerical value that falls into the interval that parameter value number is maximum obtaining is less than the numerical value that falls into the interval that parameter value number is maximum that the last time obtains, and keeps current sliding window width;
When the accuracy decompressing is less than or equal to preset value Z, and the current numerical value that falls into the interval that parameter value number is maximum obtaining is greater than the numerical value that falls into the interval that parameter value number is maximum that the last time obtains, and keeps current sliding window width.
The explanation of all embodiment of the present invention one, two, three is all included in situation in ustomer premises access equipment for compression end and explains above, and in fact, compression end also can be positioned at network side, and compression end is arranged in network equipment as gateway (Gateway).The method providing with embodiment mono-, two, three is similar, difference is, what network side obtained is the information of downlink wireless channel quality, these information are normally sent by subscriber equipment, network side gets after descending CINR, SNR or RSSI, judge whether to adjust compression end sliding window width, if needed, network side by CINR, SNR or RSSI etc. wherein any one send to the compression end of network side.Follow-up operating procedure is identical in user side with compression end, the explanation in can reference example one, two, three.
Also it should be noted that, as shown in Figure 4, when quality of wireless channel is when with CINR, SNR or RSSI etc., wherein any one represents, concrete similar feature all in above-described embodiment one, two, three: obtain the wherein any one such as CINR, SNR or RSSI in the physical layer block of its equipment, then by the wherein any one such as the CINR obtaining, SNR or RSSI, send to compressor reducer by distinctive signal (as service primitive), the information that basis is obtained in compressor reducer, and preset information is adjusted sliding window width; According to the sliding window width after adjusting, packet header is compressed, the packet after compression is transferred out to equipment by physical layer block.
Embodiment tetra-,
The embodiment of the present invention provides a kind of method of a raising compression performance, the present embodiment is similar to the aforementioned embodiment, difference is, the parameter that characterizes quality of wireless channel in the present embodiment is not CINR and so on, but adopts the quality of accuracy (or error rate) the reflection wireless channel of the data of ARQ or HARQ technical transmission.
Conventionally, in the time that ustomer premises access equipment networks, consult some parameters with network side, this negotiation can complete by signalings such as SBC, DSA/DSC, REG.The parameter of consulting generally includes: the threshold value X1 of error rate when channel quality is good (or accuracy), the threshold value Y1 of error rate when bad channel quality (or accuracy), channel quality detection cycle T.The concrete value of parameter X 1, Y1, T also can be thought to set in advance in ustomer premises access equipment.
The method explanation below the present embodiment being provided, as shown in Figure 5, the method comprises:
Step K 1: receive NACK or wherein any one of ack signal that receiving terminal sends, wherein, include decompressor end in this receiving terminal;
Wherein, for the technical scheme that adopts ARQ technical transmission, receiving terminal is receiving after data, can carry out verification to packet, and according to feeding back ACK signal of verification succeeds, verification failure is fed back NACK signal to transmitting terminal; For the technical scheme that adopts HARQ technology, receiving terminal is received after data, and packet is decoded, and successfully decoded feeding back ACK, decodes and unsuccessfully feed back NACK signal to transmitting terminal.
Step K 2: according to the NACK receiving or wherein any one of ack signal, obtain accuracy or the wherein any one of error rate of transmission data;
Wherein, first explain as an example of error rate example for illustrating of step K 2, the method for obtaining error rate can be:
In the time adopting ARQ technology, transmitting terminal is counted NACK signal in official hour T, and calculate be fed back to NACK signal, piece sequence number (BSN, the Block SequenceNumber) number that sends, account for the ratio of all BSN numbers that send in time T.Wherein, the smallest particles of piece (Block) for transmitting in ARQ technology.
In the time adopting HARQ technology, transmitting terminal is counted NACK signal in official hour T, and calculate be fed back to NACK signal, the HARQ bag number that sends, account for the ratio of all HARQ bag numbers that send in time T.Wherein, the smallest particles of HARQ bag for transmitting in HARQ technology.
Above-mentioned is the concrete operation method that obtains error rate, can unquestionablely derive the method for operation of obtaining accuracy.
Step K 3: according to the accuracy of the transmission data of obtaining or wherein any one of error rate, and preset information, adjust sliding window width;
Wherein, for illustrating of step K 3 can reference example two in about the explanation of step H2, wherein, accuracy in step K 3 or error rate are equivalent to the value of parameters C INR in embodiment bis-, X1, Y1 and T in preset information, for identical, and the broadband of the window of adjusting can be m1, n1 with the effect of X, Y in embodiment bis-and T; For the situation that has decompressor end feedback, the basis for estimation of the accuracy decompressing can be Z1, and the effect in embodiment bis-of specifically acting on is identical, therefore, can apparently can draw the specific operation process to adjusting sliding window width.No longer repeat herein.
Step K 4: similar to step H3 in embodiment bis-, according to the window width changing after adjusting, the header of packet is compressed the Packet Generation after compression to decompressor end.
Wherein, the explanation of the detailed description of step K 4 in can reference example two.
Also it should be noted that, be different from above-described embodiment one, two, three, in the present embodiment, physical layer block is just responsible for receiving and occurring data, do not there is the function of judgement, comprise in the present embodiment media access control (MAC, Media Access Control) module, in this module, carry out above-mentioned steps K2; The accuracy of obtaining or error rate are sent to compressor reducer by MAC module, by performing step K3 in compressor reducer.
By the explanation of above a kind of method that improves a compression performance that the embodiment of the present invention is provided, by accuracy or the wherein any one of error rate of transmission data, reflect quality of wireless channel situation, and then adjustment sliding window width, according to the sliding window width after adjusting, header to packet compresses, by compression after Packet Generation to decompressor end, make the compression end can be according to quality of wireless channel, adjust after sliding window width, compress, improve efficiency of transmission, save wireless signal-path band width resource, simultaneously, improve the correct decompress(ion) ability of decompressor end.
Embodiment five,
The embodiment of the present invention provides a kind of compression set, shown in Figure 6, and this compression set comprises: acquiring unit 10, adjustment unit 20, compression unit 30 and transmitting element 40.
Wherein, acquiring unit 10, for obtaining quality of wireless channel information;
Transmitting element 40, for giving decompressor end by the IP letter hair after compression.
Wherein, the quality of wireless channel information of obtaining in acquiring unit 10 can be CINR, SNR, RSSI or the accuracy (or error rate) of transmitting data while adopting ARQ, HARQ technology wherein any one represent.Therefore, acquiring unit 10 can be the wherein value of any one of accuracy (or error rate) that is specifically used for obtaining CINR, SNR, RSSI or adopts ARQ, HARQ technical transmission data.
Optionally, for the method as illustrated in embodiment tri-, corresponding, acquiring unit 10 can also comprise: the first acquiring unit 101 and statistic unit 102.
Wherein, the first acquiring unit 101, for obtaining CINR, SNR, the wherein value of any one of RSSI more than once in official hour T;
Described adjustment unit 20, specifically for according to statistics and preset information, adjusts compression end sliding window width.
Optionally, for the method as illustrated in embodiment tetra-, corresponding, this compression set can also comprise: the first receiving element 50, the NACK or the wherein any one of ack signal that send for receiving decompressor end;
Acquiring unit 10, specifically for according to the NACK or the wherein any one of ack signal that receive, obtains accuracy or the wherein any one of error rate of transmission data; Wherein, the accuracy of above-mentioned transmission data or error rate are quality of wireless channel information.
Optionally, for the method as illustrated in embodiment bis-, corresponding, adjustment unit 20, specifically in the time that the CINR value of obtaining is less than X, according to preset information, increases to n by compression end sliding window width; In the time that the CINR value of obtaining is more than or equal to X and is less than or equal to Y, keep sliding window width constant; In the time that the CINR value of obtaining is greater than Y, according to preset information, compression end sliding window width is decreased to m.
Above-mentioned adjustment unit 20 is not considered the feedback of decompressor end in the time carrying out adjustment, if this compression set also comprises: and the second receiving element 60, for receiving the feedback information of decompressor end;
Above-mentioned adjustment unit 20 can also specifically comprise: in the time that the CINR value of obtaining is less than X, and decompress accuracy be less than or equal to Z, according to preset information, compression end sliding window width is increased to n; In the time that the CINR value of obtaining is less than X, and decompress accuracy be greater than Z, keep sliding window width constant; In the time that the CINR value of obtaining is more than or equal to X and is less than or equal to Y, keep sliding window width constant; In the time that the CINR value of obtaining is greater than Y, and decompress accuracy be less than or equal to Z, keep sliding window width constant; In the time that the CINR value of obtaining is greater than Y, and decompress accuracy be greater than Z, according to preset information, compression end sliding window width is decreased to m.
Wherein, when above-mentioned CINR value can have SNR value, RSSI value or adopt ARQ, HARQ technology, transmit the wherein any one replacement of accuracy value of data.
Optionally, for the method as illustrated in embodiment bis-, corresponding, compression unit 30 can also comprise: obtain least significant bit counting unit 301 and the first compression unit 302.
Wherein, obtain least significant bit counting unit 301, for according to the adjustment result to sliding window width, obtain least significant digit k ';
The first compression unit 302, the Bit data k1 of the least significant digit k ' obtaining for basis and current packet format type transfers, compresses data.
It should be noted that, in the first compression unit 302, specifically can comprise:
If compression end sliding window width increases to n, when the least significant digit of obtaining is k ', and the Bit data k1 that judges current packet format type transfers is greater than k ', adopts current packet format type transfers data;
If compression end sliding window width increases to n, when the least significant digit of obtaining is k ', and the Bit data k1 that judges current packet format type transfers is less than k ', selects the bit number of transmission to be greater than the packet format type transfers data of k ';
If compression end sliding window width is decreased to m, obtaining least significant digit is k " time, according to former packet format type transfers data.Certainly, also can transmit according to new packet format type, select the bit number of transmission to be more than or equal to k ", and the packet format type less than the bit number k1 of former packet format type transfers.
By the explanation of above a kind of compression set that the embodiment of the present invention is provided, according to the quality of wireless channel information of obtaining, adjust sliding window width, according to the sliding window width after adjusting, header to packet compresses, by compression after Packet Generation to decompressor end, make the compression end can be according to quality of wireless channel, adjust after sliding window width, compress, improve efficiency of transmission, saved wireless signal-path band width resource, meanwhile, improved the correct decompress(ion) ability of decompressor end.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is can carry out the hardware that instruction is relevant by program to complete, this program can be stored in a computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
Method and the compression set of the raising above embodiment of the present invention a being provided compression performance are described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (12)
1. a method that improves a compression performance, is characterized in that, comprising:
Obtain quality of wireless channel information;
According to the described quality of wireless channel information of obtaining and preset information, adjust sliding window width;
According to adjust after sliding window width, the header of packet is compressed, by compression after Packet Generation to decompressor end;
Wherein, described in, obtaining quality of wireless channel information specifically comprises: the ratio CINR, signal to noise ratio snr, the wherein parameter value of any one of received signal strength indicator RSSI that obtain carrier wave and interference noise;
The quality of wireless channel information of obtaining described in described basis and preset information, adjust sliding window width and specifically comprise: according to the wherein parameter value of any one and preset information of the CINR obtaining, SNR or RSSI, adjust described sliding window width; Wherein, the wherein parameter value of any one and preset information of CINR, the SNR that described basis is obtained or RSSI, adjust compression end sliding window width and specifically comprise:
When the described CINR obtaining, SNR or RSSI are when wherein the parameter value of any one is less than preset value X, sliding window width is increased to preset width n;
When the described CINR obtaining, SNR or RSSI are when wherein the parameter value of any one is more than or equal to described preset value X and is less than or equal to preset value Y, keep sliding window width constant;
When the described CINR obtaining, SNR or RSSI wherein the parameter value of any one be greater than described Y, sliding window width is decreased to preset width m.
2. method according to claim 1, is characterized in that, the quality of wireless channel information that described basis is obtained and preset information, and before adjusting sliding window width, described method also comprises:
Receive the feedback information that decompressor end sends, described feedback information comprises NACK or the ACK feedback of described decompressor end to packet decompress(ion);
According to described feedback information, obtain the accuracy of decompression;
The wherein parameter value of any one and preset information of CINR, the SNR that described basis is obtained or RSSI, adjust compression end sliding window width and specifically comprise:
When the described CINR obtaining, SNR or RSSI are when wherein the parameter value of any one is less than preset value X, and the accuracy decompressing is less than or equal to preset value Z, and sliding window width is increased to preset width n;
When the described CINR obtaining, SNR or RSSI are when wherein the parameter value of any one is less than preset value X, and the accuracy decompressing is greater than preset value Z, keeps current sliding window width;
When the described CINR obtaining, SNR or RSSI are when wherein the parameter value of any one is more than or equal to described preset value X and is less than or equal to described preset value Y, keep current sliding window width;
When the described CINR obtaining, SNR or RSSI wherein the parameter value of any one be greater than described Y, and the accuracy decompressing is greater than preset value Z, and sliding window width is decreased to preset width m;
When the described CINR obtaining, SNR or RSSI wherein the parameter value of any one be greater than described Y, and the accuracy decompressing is less than or equal to preset value Z, keeps current sliding window width.
3. method according to claim 1, is characterized in that, described in obtain quality of wireless channel information and specifically comprise:
In preset time T more than once obtain CINR, SNR or the wherein parameter value of any one of RSSI;
Add up CINR, SNR or the wherein parameter value of any one of RSSI in described preset time T, fall into the number in preset each interval, the described preset each interval quality of wireless channel information that represents;
The quality of wireless channel information of obtaining described in described basis and preset information, adjusting sliding window width specifically comprises: according to the information of the maximum interval of the parameter value number falling into and the maximum corresponding sliding window width in interval of preset and the described parameter value number falling into, adjust sliding window width.
4. method according to claim 3, is characterized in that, the quality of wireless channel information that described basis is obtained and preset information, and before adjusting sliding window width, described method also comprises:
Receive the feedback information that decompressor end sends, described feedback information comprises NACK or the ACK feedback of described decompressor end to packet decompress(ion);
According to described feedback information, obtain the accuracy of decompression;
The information of the corresponding sliding window width in interval that the interval that described parameter value number that described basis falls into is maximum and preset and the described parameter value number falling into are maximum, adjusts sliding window width, specifically comprises:
When the accuracy decompressing is greater than preset value Z, and the current numerical value that falls into the interval that parameter value number is maximum obtaining is greater than the numerical value that falls into the interval that parameter value number is maximum that the last time obtains, by sliding window width adjustment to the interval corresponding sliding window width maximum with the described described parameter value number falling into;
When the accuracy decompressing is less than or equal to preset value Z, and the current numerical value that falls into the interval that parameter value number is maximum obtaining is less than the numerical value that falls into the interval that parameter value number is maximum that the last time obtains, by sliding window width adjustment to the interval corresponding sliding window width maximum with the described described parameter value number falling into;
When the accuracy decompressing is greater than preset value Z, and the current numerical value that falls into the interval that parameter value number is maximum obtaining is less than the numerical value that falls into the interval that parameter value number is maximum that the last time obtains, and keeps current sliding window width;
When the accuracy decompressing is less than or equal to preset value Z, and the current numerical value that falls into the interval that parameter value number is maximum obtaining is greater than the numerical value that falls into the interval that parameter value number is maximum that the last time obtains, and keeps current sliding window width.
5. method according to claim 1, is characterized in that, when adopting HARQ (ARQ) or mixed automatic retransfer request (HARQ) technology while communicating, described in obtain quality of wireless channel information and specifically comprise:
Receive NACK or wherein any one of ack signal that receiving terminal sends, described receiving terminal comprises decompressor end;
According to the described NACK receiving or wherein any one of ack signal, obtain accuracy or the wherein any one of error rate of transmission data, described accuracy or error rate wherein any one represent quality of wireless channel;
The quality of wireless channel information of obtaining described in described basis and preset information, adjust sliding window width and specifically comprise: according to the accuracy of the described transmission data of obtaining or wherein any one and preset information of error rate, adjust sliding window width.
6. method according to claim 5, is characterized in that, the accuracy of the transmission data that described basis is obtained or error rate be any one and preset information wherein, adjusts sliding window width, specifically comprises:
In the time that the accuracy of described transmission data is less than preset value X1, sliding window width is increased to preset width n1;
In the time that the accuracy of described transmission data is more than or equal to described preset value X1 and is less than or equal to preset value Y1, keep sliding window width constant;
When the accuracy of described transmission data is greater than described Y1, sliding window width is decreased to preset width m1.
7. according to the method described in claim 5 or 6 any one, it is characterized in that, the quality of wireless channel information that described basis is obtained and preset information, before adjusting sliding window width, described method also comprises:
Receive the feedback information that decompressor end sends, described feedback information comprises NACK or the ACK feedback of described decompressor end to packet decompress(ion);
According to described feedback information, obtain the accuracy of decompression;
The accuracy that described basis is obtained or error rate be any one and preset information wherein, adjusts sliding window width, specifically comprises:
In the time that the accuracy of described transmission data is less than preset value X1, and decompress accuracy be less than or equal to preset value Z1, sliding window width is increased to preset width n1;
In the time that the accuracy of described transmission data is less than preset value X1, and decompress accuracy be greater than preset value Z1, keep current sliding window width;
In the time that the accuracy of described transmission data is more than or equal to described preset value X1 and is less than or equal to preset value Y1, keep current sliding window width;
When the accuracy of described transmission data is greater than described Y1, and decompress accuracy be greater than preset value Z1, sliding window width is decreased to preset width m1;
When the accuracy of described transmission data is greater than described Y1, and decompress accuracy be less than or equal to preset value Z1, keep current sliding window width.
8. a compression set, is characterized in that, comprising: acquiring unit, adjustment unit, compression unit and transmitting element,
Described acquiring unit, for obtaining quality of wireless channel information;
Described adjustment unit, for the quality of wireless channel information obtained described in basis and preset information, adjusts sliding window width;
Described compression unit, for according to the sliding window width after adjusting, compresses the header of packet;
Described transmitting element, for by compression after Packet Generation to decompressor end;
Wherein, described acquiring unit, specifically for obtaining ratio CINR, signal to noise ratio snr, the wherein parameter value of any one of received signal strength indicator RSSI of carrier wave and interference noise;
Described adjustment unit, specifically for according to the wherein parameter value of any one and preset information of the CINR, the SNR that obtain or RSSI, adjusts compression end sliding window width;
Wherein, described adjustment unit, specifically for when described in the CINR, the SNR that obtain or RSSI when wherein the parameter value of any one is less than preset value X, according to preset information, sliding window width is increased to preset width n; When the described CINR obtaining, SNR or RSSI are when wherein the parameter value of any one is more than or equal to described preset value X and is less than or equal to preset value Y, keep sliding window width constant; When the described CINR obtaining, SNR or RSSI wherein the parameter value of any one be greater than described Y, sliding window width is decreased to preset width m.
9. compression set according to claim 8, is characterized in that, described device also comprises: the second receiving element, the feedback information sending for receiving decompressor end;
Described adjustment unit specifically for the quality of wireless channel information obtained described in basis, preset information and described in the feedback information of the decompressor end that receives, adjust sliding window width.
10. compression set according to claim 8, is characterized in that, in the time adopting HARQ (ARQ) or mixed automatic retransfer request (HARQ) technology to communicate, described device also comprises:
The first receiving element, the NACK or the wherein any one of ack signal that send for receiving receiving terminal, described receiving terminal comprises decompressor end;
Described acquiring unit, specifically for according to receiving described NACK or wherein any one of ack signal, obtains accuracy or the wherein any one of error rate of transmission data, and described accuracy or error rate wherein any one represent quality of wireless channel letter;
Described adjustment unit, specifically for accuracy or wherein any one and the preset information of error rate obtained described in basis, adjusts sliding window width.
11. compression sets according to claim 8, is characterized in that, described acquiring unit comprises: the first acquiring unit and statistic unit;
Described the first acquiring unit, in preset time T more than once obtain CINR, SNR or the wherein parameter value of any one of RSSI;
Described statistic unit, for adding up CINR, SNR or the wherein parameter value of any one of RSSI in described preset time T, falls into the number in preset each interval, the described preset each interval quality of wireless channel information that represents;
Described adjustment unit, specifically for according to the maximum interval of the parameter value number falling into and preset information, adjusts sliding window width.
12. compression sets according to claim 8, is characterized in that, described compression unit comprises: obtain least significant bit counting unit and the first compression unit,
The described least significant bit counting unit that obtains, for according to the sliding window width after described adjustment, obtains least significant digit;
Described the first compression unit, for according to the number of significant digit obtaining and current packet format type, compresses data.
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| PCT/CN2009/071313 WO2010118579A1 (en) | 2009-04-16 | 2009-04-16 | Method and apparatus for improving header compression performance |
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