CN105208596A - Header compression method, decompression method and device - Google Patents
Header compression method, decompression method and device Download PDFInfo
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- CN105208596A CN105208596A CN201410270492.6A CN201410270492A CN105208596A CN 105208596 A CN105208596 A CN 105208596A CN 201410270492 A CN201410270492 A CN 201410270492A CN 105208596 A CN105208596 A CN 105208596A
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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
The present invention discloses a header compression method, a decompression method and a device, relating to the technical field of communication. The problems of large memory occupation of header compression, slow compression speed and low compression efficiency in the prior art are solved. The header compression method comprises a step of determining whether an optional idle index exists in the condition that a corresponding index is needed to be configured for a list item to be compressed, a step of selecting an index whose use frequency is lower than a preset threshold from the index configured for the list item in the condition that an optional idle index does not exist and replacing the list item corresponding to the index by the list item to be compressed such that the list item to be compressed is compressed by using a replaced index.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of gauge outfit compression method, decompressing method and device.
Background technology
Due to the restriction of physical condition, the transmission rate compared with wire link of the wireless link in mobile communication system is lower, and the error rate is higher.In order to limited wireless signal-path band width resource effectively can be utilized, introduce robustness head compression technology (RobustHeaderCompress, hereinafter referred to as ROHC).The core of ROHC is the information in the packets headers utilizing the information redundancy between the grouping of Business Stream to compress pellucidly to conciliate straightening to connect between connected node.ROHC technology is described by the RFC3095 document of IETF (Internet Engineering Task group), but in the document, do not define compression and the decompress(ion) of IP head, therefore in June, 2004, ROHC working group has in RFC3843 separately for the Compress softwares of IP head defines a framework, and revise at the relevant documentation of in February, 2007 IETF to ROHC, revision document is RFC4815.
In the compression of ROHC head, use different Profile to identify different data packet streams, to use corresponding Compress and decompress of the data framework to it.As: wherein Profile0 mark uses unpressed method to transmit IP data packet stream, Profile1 mark is to RTP (Real-timeTransportProtocol, RTP)/UDP (UserDataProtocol, User Datagram Protoco (UDP))/IP data packet stream carry out compression process, Profile2 mark carries out compression process to UDP/IP data packet stream, Profile3 mark carries out compression process to ESP/IP (IP encapsulating security payload ESP) data packet stream, and Profile4 mark carries out compression process to IP data packet stream.Wherein, when Profile1 compresses RTP head, effect source (ContributingSource, hereinafter referred to as the CSRC) list to RTP head comprises also is needed to compress.
List compression general principle is that each list items distributes unique index by compressor reducer, safeguards a translation table with all list items simultaneously, and use list items index to identify each list items.List items index is sent out in compressed list with corresponding list items simultaneously, when compressor reducer determination decompression machine has got the mapping relations between index and list items, namely compressor reducer can represent corresponding list items by independent transmission list index in compressed package, reaches and reduces the object that data volume realizes compression.
But, RTP list compression more complicated, in the compression of a real RTP bag stream sends, list entry to be processed is needed to have thousands of, therefore the corresponding relation that the memory headroom of at substantial comes between maintenance column list item and index is needed, and take a long time the index that just can find correspondence, therefore compression speed is slow, and compression efficiency is lower.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of gauge outfit compression method, decompressing method and device, takies greatly in order to solve gauge outfit compression memory in prior art, and compression speed is slow, the problem that compression efficiency is low.
On the one hand, the invention provides a kind of gauge outfit compression method, comprising: when needing the index for list items to be compressed configuration is corresponding, determining whether there is alternative idle index; When there is not idle index, from for choice for use frequency the index of list items configuration is lower than the index of predetermined threshold value, and list items corresponding for this index is replaced with described list items to be compressed, utilize the described index after replacing to compress to make described list items to be compressed.
Optionally, described method also comprises: before determining whether there is alternative idle index, and determining whether needs for index corresponding to list items to be compressed configuration.
Optionally, determine whether to need the index for list items to be compressed configuration is corresponding to comprise described in: to determine described list items to be compressed whether record to some extent in translation table; Wherein, described translation table is for recording the corresponding relation of list items and index; When described list items to be compressed records to some extent in described translation table, determine not need for index corresponding to described list items to be compressed configuration; In unwritten situation, determine to need for index corresponding to described list items to be compressed configuration in translation table at described list items to be compressed.
Optionally, determine whether there is alternative idle index described in comprise: determine in described translation table, whether to there is the idle index of not specifying respective column list item.
Optionally, described from for choice for use frequency the index of list items configuration comprises lower than the index of predetermined threshold value: in the process of compressed list, that determines the access times altogether of all indexes and each index respectively is used alone number of times; If described in be used alone the ratio of number of times and described access times altogether lower than described predetermined threshold value, be used alone the frequency of utilization of index corresponding to number of times described in determining lower than described predetermined threshold value.
On the other hand, the present invention also provides a kind of gauge outfit decompressing method, comprising: determine that whether there is same index in the compressed package received successively is configured to the situation of different list items; When there is same index and successively being configured to different list items, with compressed package described in the corresponding relation decompress(ion) of the list items finally configured and index.
On the other hand, the present invention also provides a kind of gauge outfit compression set, comprising: compression determining unit, for when needing the index for list items to be compressed configuration is corresponding, determines whether there is alternative idle index; Replacement unit, for when described compression determining unit determines to there is not idle index, from the index being configured with list items, choice for use frequency is lower than the index of predetermined threshold value, and list items corresponding for this index is replaced with described list items to be compressed, utilize the described index after replacing to compress to make described list items to be compressed.
Optionally, described compression determining unit, also for before determining whether there is alternative idle index, determines whether to need for index corresponding to list items to be compressed configuration.
Optionally, described replacement unit, specifically for: in the process of compressed list, that determines the access times altogether of all indexes and each index respectively is used alone number of times; If described in be used alone the ratio of number of times and described access times altogether lower than predetermined threshold value, the frequency of utilization of index corresponding to number of times is used alone lower than predetermined threshold value described in determining, and list items corresponding for this index is replaced with described list items to be compressed, utilize the described index after replacing to compress to make described list items to be compressed.
On the other hand, the present invention also provides a kind of gauge outfit decompression device, comprising: decompress(ion) determining unit, whether there is same index for determining and is successively configured to different list items in the compressed package that receives; Decompression units, for determining that in described decompress(ion) determining unit there is same index is successively configured to different list items, with compressed package described in the corresponding relation decompress(ion) of the list items finally configured and index.
Gauge outfit compression method, decompressing method and device that the embodiment of the present invention provides, at needs for list items configuration index but when there is not idle index, can from for choice for use frequency the index of list items configuration be lower than the index of predetermined threshold value, and by this frequency of utilization lower than predetermined threshold value index corresponding to list items replace with described list items to be compressed, with make described list items to be compressed utilize replace after index compress.Like this, the memory headroom that obviously can be alleviated compression end by the recycling of index is used, and shortens the time of search spent by translation table, thus effectively improves compression efficiency.
Accompanying drawing explanation
Fig. 1 is a kind of flow chart of the gauge outfit compression method that the embodiment of the present invention provides;
Fig. 2 is a kind of flow chart of the gauge outfit decompressing method that the embodiment of the present invention provides;
Fig. 3 is a kind of detail flowchart of the gauge outfit compression method that provides of the embodiment of the present invention and decompressing method;
Fig. 4 is a particular flow sheet of a step in Fig. 3;
Fig. 5 is a kind of structural representation of the gauge outfit compression set that the embodiment of the present invention provides;
Fig. 6 is a kind of structural representation of the gauge outfit decompression device that the embodiment of the present invention provides.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, do not limit the present invention.
As shown in Figure 1, embodiments of the invention provide a kind of gauge outfit compression method, comprising:
S11, when needing the index for list items to be compressed configuration is corresponding, determines whether there is alternative idle index;
S12, when there is not idle index, from for choice for use frequency the index of list items configuration is lower than the index of predetermined threshold value, and list items corresponding for this index is replaced with described list items to be compressed, utilize the described index after replacing to compress to make described list items to be compressed.
The gauge outfit compression method that the embodiment of the present invention provides, at needs for list items configuration index but when there is not idle index, can from for choice for use frequency the index of list items configuration be lower than the index of predetermined threshold value, and by this frequency of utilization lower than predetermined threshold value index corresponding to list items replace with described list items to be compressed, with make described list items to be compressed utilize replace after index compress.Like this, the memory headroom that obviously can be alleviated compression end by the recycling of index is used, and shortens the time of search spent by translation table, thus effectively improves compression efficiency.
It should be noted that, when data flow transmits to solution pressure side from compression end with the form of packet, the gauge outfit of each packet sends to solution pressure side after also can being compressed.The method of this gauge outfit compression may be used for the compression of RTP packet, and can certainly be used in the packet of other kinds supporting this gauge outfit compression method, embodiments of the invention do not limit this.
Concrete, in the gauge outfit compression of packet, first can set up the corresponding relation of list items and index, then utilize simple index to represent more complicated list items data, thus realize the compression reducing data volume.Optionally, in embodiments of the invention, can pass through the corresponding relation of various method establishment list items and index, as safeguarded a mapping relations table, or by certain mapping relations function etc., embodiments of the invention are not restricted this.
Below to safeguard mapping relations table in RTP data packet compressing process, gauge outfit compression method provided by the invention is described in detail.In one embodiment of the invention, maintain the mapping table of a list items and index in compression end, be called translation table.In this translation table, store all indexes, both comprised and be configured the index of list items, also comprise the idle index being not yet configured list items.Whenever starting to compress a new packet, also can comprise before step S11 and determine whether to need, for index corresponding to list items to be compressed configuration, optionally, specifically to realize by following steps:
Determine list items to be compressed in this packet whether record to some extent in this translation table, wherein, described translation table is for recording the corresponding relation of list items and index;
When described list items to be compressed records to some extent in described translation table, determine not need for index corresponding to described list items to be compressed configuration;
In unwritten situation, determine to need for index corresponding to described list items to be compressed configuration in translation table at described list items to be compressed.
But, because all indexes are all stored in translation table, translation table finite capacity, and the data packet number sent is huge, therefore very possible when needing for list items configuration index item to be compressed, indexes all in translation table has all been configured corresponding list items, therefore, when needing the index for list items to be compressed configuration is corresponding, also need to determine whether there is alternative idle index, be specifically as follows in the present embodiment: determine in described translation table, whether to there is the idle index of not specifying respective column list item.If there is so idle index, then can give this list items to be compressed by this idle index configurations, such as, can by project corresponding with this idle index in this list items write translation table.If there is no so idle index, then embodiments of the invention additionally provide a kind of reuse mechanism of index, no index for a long time or frequency of utilization is too low recently index are removed with the corresponding relation of original list items, and by this index configurations to new list items to be compressed.Like this, although the data packet number sent is huge, such as thousands of, but the index in translation table does not need very large, such as 200, the memory headroom that obviously can be alleviated compression end by the recycling of index is used, and shortens the time of search spent by translation table, thus greatly accelerate transmission speed, effectively improve compression efficiency.
Optionally, in step s 12, when there is not idle index, from for choice for use frequency the index of list items configuration can specifically comprise lower than the index of predetermined threshold value:
In the process of compressed list, that determines the access times altogether of all indexes and each index respectively is used alone number of times;
If described in be used alone the ratio of number of times and described access times altogether lower than described predetermined threshold value, be used alone the frequency of utilization of index corresponding to number of times described in determining lower than described predetermined threshold value.
Accordingly, embodiments of the invention also provide a kind of gauge outfit decompressing method, and as shown in Figure 2, the method comprises:
S21, determines that whether there is same index in the compressed package received successively is configured to the situation of different list items;
S22, when there is same index and successively being configured to different list items, with compressed package described in the corresponding relation decompress(ion) of the list items finally configured and index.
The gauge outfit decompressing method that the embodiment of the present invention provides, can determine that whether there is same index in the compressed package received successively is configured to the situation of different list items, and when there is same index and successively being configured to different list items, can with compressed package described in the corresponding relation decompress(ion) of the list items finally configured and index, like this, obviously can alleviate by the recycling of index the memory headroom separating pressure side to use, shorten the time of search spent by translation table, thus effectively improve decompress(ion) efficiency.
Optionally, also can maintain the mapping table of a list items and index in solution pressure side, also claim translation table.After having Packet Generation to come, if only include index in this packet and there is no corresponding list items, occurred before this list items is then described, and also had corresponding record in translation table, therefore can decompress according to the corresponding relation in translation table.If not only comprise index in packet also comprise the list items corresponding with this index, so can to check in translation table whether this index recorded, if, then illustrate that the index this time sent and list items are reusing this index, accordingly, should go to replace the corresponding relation recorded in translation table with the corresponding relation of the index newly sent and list items, and the packet decompressed below is removed with new corresponding relation, until there is again new index to send over together with list items, then upgrade new index corresponding relation.
Below by specific embodiment, gauge outfit compression method provided by the invention and decompressing method are described in detail.As shown in Figure 3, gauge outfit compression method provided by the invention and decompressing method comprise the steps:
S301, what compression end set the list entry index of be of moderate size (between 20-50) deposits list;
After receiving packet, analyze list items to be compressed in this packet the need of the compression carrying out profile1 type, if whether the list number analyzing RTP territory is 0, if be not 0, then carries out list compression.
S302, during list items compression, read the list items needing to send successively, if this list items exists in translation table, then do not need newly-built this list items configuration index of mapping Xiang Laiwei in translation table, use list items described in index compression corresponding in translation table; Otherwise perform S303.
S303, when needing the index for described list items to be compressed configuration is corresponding, determines whether there is alternative idle index in the translation table of compressed side; If present, perform S304, if there is no, perform S305;
S304, gives this list items to be compressed by one of them idle index configurations;
Such as, have 50 indexes in a translation table, wherein sequence number is that the index of 0-27 has been configured corresponding list items, can be so now that index configurations gives up-to-date list items to be compressed by sequence number.Further, in compression process subsequently, the corresponding relation in translation table is used to compress to the list items in packet below.
S305, finds in the list entry deposited of compression end the index found (if frequency of utilization is lower than 1/3) for a long time do not used list items is corresponding, and list items corresponding for this index replaced with up-to-date list items to be compressed;
S306, is sent to solution pressure side by the list items compressed;
S307, if only include index in packet and do not have corresponding list items, separates pressure side and decompresses according to the corresponding relation in translation table.If not only comprise index in packet also comprise the list items corresponding with this index, to check in translation table whether this index recorded; If so, perform S308, if not, perform S309.
S308, go to replace the corresponding relation recorded in translation table with the corresponding relation of the index newly sent and list items, and remove the packet decompressed below with new corresponding relation, until there is new index to send over together with list items, then upgrade new index corresponding relation.
S309, sets up the corresponding relation of list items and index in the translation table separating pressure side.
Concrete, as shown in Figure 4, in step S305, find can carrying out in accordance with the following steps of the list items for a long time do not used:
S401, defines a global variable, be used for flag data bag stream list items compression process in the access times altogether of all indexes, the index for each list items defines an independent variable, and what mark each index respectively is used alone number of times.
S402, every second compression uses the index in translation table, and this global variable is increased progressively 1.Each use index, just adds 1 by corresponding for this index number of times that is used alone;
S403, when needing to find the list items for a long time do not used, what traversal of lists obtained index corresponding to each list items successively is used alone number of times, if be wherein used alone the ratio of number of times and access times altogether lower than described predetermined threshold value, be used alone the frequency of utilization of index corresponding to number of times described in determining lower than described predetermined threshold value, then this eligiblely can be reused.
Accordingly, as shown in Figure 5, embodiments of the invention also provide a kind of gauge outfit compression set, comprising:
Compression determining unit 50, for when needing the index for described list items to be compressed configuration is corresponding, determines whether there is alternative idle index;
Replacement unit 52, for when described compression determining unit determines to there is not idle index, from the index being configured with list items, choice for use frequency is lower than the index of predetermined threshold value, and list items corresponding for this index is replaced with described list items to be compressed, utilize the described index after replacing to compress to make described list items to be compressed.
The gauge outfit compression set that the embodiment of the present invention provides, compression determining unit 50 can determine whether to need to index corresponding to list items to be compressed configuration, at needs for its configuration index but when there is not idle index, replacement unit 52 can from choice for use frequency the index being configured with list items lower than the index of predetermined threshold value, and by this frequency of utilization lower than predetermined threshold value index corresponding to list items replace with described list items to be compressed, with make described list items to be compressed utilize replace after index compress.Like this, the memory headroom that obviously can be alleviated compression end by the recycling of index is used, and shortens the time of search spent by translation table, thus effectively improves compression efficiency.
Further, compression determining unit 50, also for before determining whether there is alternative idle index, determines whether to need for index corresponding to list items to be compressed configuration.Optionally, compression determining unit 50, comprises list items determination module, for:
Determine described list items to be compressed whether record to some extent in translation table; Wherein, described translation table is for recording the corresponding relation of list items and index;
When described list items to be compressed records to some extent in described translation table, determine not need for index corresponding to described list items to be compressed configuration;
In unwritten situation, determine to need for index corresponding to described list items to be compressed configuration in translation table at described list items to be compressed.
Optionally, compression determining unit 50 also comprises index determination module, for when needing the index for described list items to be compressed configuration is corresponding, determines whether there is the idle index of not specifying respective column list item in described translation table.
Optionally, replacement unit 52, specifically for:
In the process of compressed list, that determines the access times altogether of all indexes and each index respectively is used alone number of times;
If described in be used alone the ratio of number of times and described access times altogether lower than predetermined threshold value, the frequency of utilization of index corresponding to number of times is used alone lower than predetermined threshold value described in determining, and list items corresponding for this index is replaced with described list items to be compressed, utilize the described index after replacing to compress to make described list items to be compressed.
Accordingly, as shown in Figure 6, embodiments of the invention also provide a kind of gauge outfit decompression device, comprising:
Whether decompress(ion) determining unit 60, exist same index for determining and successively configured to different list items in the compressed package that receives;
Decompression units 62, for determining that in described decompress(ion) determining unit there is same index is successively configured to different list items, with compressed package described in the corresponding relation decompress(ion) of the list items finally configured and index.
The gauge outfit decompression device that the embodiment of the present invention provides, decompress(ion) determining unit 60 can determine that whether there is same index in the compressed package received successively is configured to different list items, and when there is same index and successively being configured to different list items, decompression units 62 can with compressed package described in the corresponding relation decompress(ion) of the list items finally configured and index, like this, obviously can alleviate by the recycling of index the memory headroom separating pressure side to use, shorten the time of search spent by translation table, thus effectively improve decompress(ion) efficiency.
It should be noted that, also can maintain the mapping table of a list items and index in solution pressure side, also claim translation table.After having Packet Generation to come, if only include index in this packet and there is no corresponding list items, occurred before this list items is then described, and also had corresponding record in translation table, therefore can decompress according to the corresponding relation in translation table.If not only comprise index in packet also comprise the list items corresponding with this index, so can to check in translation table whether this index recorded, if, then illustrate that the index this time sent and list items are reusing this index, accordingly, should go to replace the corresponding relation recorded in translation table with the corresponding relation of the index newly sent and list items, and the packet decompressed below is removed with new corresponding relation, until there is again new index to send over together with list items, then upgrade new index corresponding relation.
Although be example object, disclose the preferred embodiments of the present invention, it is also possible for those skilled in the art will recognize various improvement, increase and replacement, and therefore, scope of the present invention should be not limited to above-described embodiment.
Claims (10)
1. a gauge outfit compression method, is characterized in that, comprising:
When needing the index for list items to be compressed configuration is corresponding, determine whether there is alternative idle index;
When there is not idle index, from for choice for use frequency the index of list items configuration is lower than the index of predetermined threshold value, and list items corresponding for this index is replaced with described list items to be compressed, utilize the described index after replacing to compress to make described list items to be compressed.
2. method according to claim 1, is characterized in that, described method also comprises: before determining whether there is alternative idle index, and determining whether needs for index corresponding to list items to be compressed configuration.
3. method according to claim 2, is characterized in that, described in determine whether to need the index for list items to be compressed configuration is corresponding to comprise:
Determine described list items to be compressed whether record to some extent in translation table; Wherein, described translation table is for recording the corresponding relation of list items and index;
When described list items to be compressed records to some extent in described translation table, determine not need for index corresponding to described list items to be compressed configuration;
In unwritten situation, determine to need for index corresponding to described list items to be compressed configuration in translation table at described list items to be compressed.
4. method according to claim 3, is characterized in that, described in determine whether there is alternative idle index and comprise:
Determine in described translation table, whether to there is the idle index of not specifying respective column list item.
5. method according to claim 1, is characterized in that, described from for choice for use frequency the index of list items configuration comprises lower than the index of predetermined threshold value:
In the process of compressed list, that determines the access times altogether of all indexes and each index respectively is used alone number of times;
If described in be used alone the ratio of number of times and described access times altogether lower than described predetermined threshold value, be used alone the frequency of utilization of index corresponding to number of times described in determining lower than described predetermined threshold value.
6. a gauge outfit decompressing method, is characterized in that, comprising:
Determine that whether there is same index in the compressed package received successively is configured to the situation of different list items;
When there is same index and successively being configured to different list items, with compressed package described in the corresponding relation decompress(ion) of the list items finally configured and index.
7. a gauge outfit compression set, is characterized in that, comprising:
Compression determining unit, for when needing the index for list items to be compressed configuration is corresponding, determines whether there is alternative idle index;
Replacement unit, for when described compression determining unit determines to there is not idle index, from the index being configured with list items, choice for use frequency is lower than the index of predetermined threshold value, and list items corresponding for this index is replaced with described list items to be compressed, utilize the described index after replacing to compress to make described list items to be compressed.
8. device according to claim 7, is characterized in that, described compression determining unit, also for before determining whether there is alternative idle index, determines whether to need for index corresponding to list items to be compressed configuration.
9. device according to claim 7, is characterized in that, described replacement unit, specifically for:
In the process of compressed list, that determines the access times altogether of all indexes and each index respectively is used alone number of times;
If described in be used alone the ratio of number of times and described access times altogether lower than predetermined threshold value, the frequency of utilization of index corresponding to number of times is used alone lower than predetermined threshold value described in determining, and list items corresponding for this index is replaced with described list items to be compressed, utilize the described index after replacing to compress to make described list items to be compressed.
10. a gauge outfit decompression device, is characterized in that, comprising:
Whether decompress(ion) determining unit, exist same index for determining and successively configured to different list items in the compressed package that receives;
Decompression units, for determining that in described decompress(ion) determining unit there is same index is successively configured to different list items, with compressed package described in the corresponding relation decompress(ion) of the list items finally configured and index.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410270492.6A CN105208596A (en) | 2014-06-17 | 2014-06-17 | Header compression method, decompression method and device |
| PCT/CN2014/084315 WO2015192452A1 (en) | 2014-06-17 | 2014-08-13 | Header compression method, decompression method and device |
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| CN201410270492.6A CN105208596A (en) | 2014-06-17 | 2014-06-17 | Header compression method, decompression method and device |
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| CN109257772A (en) * | 2017-07-13 | 2019-01-22 | 普天信息技术有限公司 | A kind of sending, receiving method and user equipment of RTP data |
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