CN1812306A - Method of crc residue error detection and handling - Google Patents
Method of crc residue error detection and handling Download PDFInfo
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- CN1812306A CN1812306A CN 200510065203 CN200510065203A CN1812306A CN 1812306 A CN1812306 A CN 1812306A CN 200510065203 CN200510065203 CN 200510065203 CN 200510065203 A CN200510065203 A CN 200510065203A CN 1812306 A CN1812306 A CN 1812306A
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Abstract
The invention provides a method for checking transmission faults which exceed a checking range of a cycle verbose checking mechanism, which is used in a receiving end of a mobile communication system and is used to check the transmission faults which exceed the checking range of the cycle verbose checking mechanism. The method comprises: temporarily storing a plurality of protocol data units (Protocol Data Unit) in turn, checking the sequence number (Sequence Number) of the protocol data units in turn, and not processing a protocol data unit and removing the protocol data unit when the sequence number of the protocol data unit is not continuous with the sequence number of the protocol data unit which is before the protocol data unit and when the sequence number of the protocol data unit is not continuous with the sequence number of the protocol data unit which is after the protocol data unit.
Description
Technical field
The present invention relates to the method that a kind of detection exceeds the error of transmission of the verbose verification mechanism detection range that circulates, particularly relate to a kind of mat deletion sequence number and the discontinuous protocol Data Unit in front and back method with the detected transmission mistake.
Background technology
Along with the arriving of information age, the demand of mobile voice, data communication and various mobile services increases day by day, and known mobile communcations system has faced communication channel and do not applied the bottleneck that uses with the transmission rate deficiency.Therefore, can provide the third generation mobile of more high spectrum utilization rate, higher rate transmission service to arise at the historic moment.Compared to existing second generation mobile communication technology, the most basic difference of third generation mobile is to adopt Wideband-CDMA (Wideband Code Division Multiple Access, WCDMA) radio access mode, it transmits in order to height spectrum utilization efficiency, high coverage rate and multi-medium data high-quality, two-forty to be provided, simultaneously can also satisfy various QoS service request simultaneously, provide tool flexible diversified transmitted in both directions service, and preferable communication quality is provided, effectively reduce the communicating interrupt rate.
The WCDMA Protocol Stack can cut be divided into access relevant portion (Access Stratum, AS) and non-access relevant portion (Non-Access Stratum, NAS).Wherein AS comprises Radio Resource control (Radio Resource Control, RRC), wireless link control (Radio Link Control, RLC), medium access control (Media Access Control, MAC), packet data aggregation protocol (Packet DataConvergence Protocol, PDCP), (Broadcast/MulticastControl BMC) waits the different sublayer of several functions in broadcasting and multiple broadcasting control.About the running of above-mentioned each sublayer, those skilled in the art knows, does not repeat them here.Wherein, the major function of wireless link key-course communications protocol is handled for the different transmission quality of third generation mobile system is provided, according to different transmission quality requirements,, carry out different cuttings, transmission, re-transmission and combined treatment at data of being transmitted or control command.In the third generation mobile system, dialogue (Conversational), crossfire (Streaming), mutual (Interactive) and background four kinds of different transmission quality grades such as (Background) have been defined.Wireless link control is in following 3 kinds of modes, and the cutting enfeoffment of wrapping is handled, and requires to satisfy different transmission qualities:
Transparent mode (Transparent Mode, TM): directly cut enfeoffment according to packet length, do not do any other processing.Be applicable to the service that real-time Transmission is had relatively high expectations, as voice call.
Unacknowledged Mode (Unacknowledged Mode, UM): except the cutting enfeoffment, before each bag, add suitable gauge outfit in addition, wrap the inspection of order and abandoning of erroneous packets to assist receiving terminal.Being applicable to all has the service of requirement to real-time Transmission and bag order, as procotol voice (Voice overInternet Protocol, VoIP) communication, video phone (Video Phone) etc.
3. (Acknowledged Mode, AM): except cutting enfeoffment and bag order gauge outfit additional, also need carry out order inspection, duplicate detection and retransmission process at each bag at receiving terminal, all bags of make suring can both correctly arrive receiving terminal to affirmation mode.Be applicable to real-time Transmission less demandingly, but the exigent service of data correctness is as services such as web page browsing, Email, document transmission.
In addition, wireless link control also provides bags such as flow control, the reformation of bag order, packet encryption, error detection to handle service, so that complete data cutting, enfeoffment and transmission service to be provided.
Pass through wireless transmission; user data and some signaling information (Signaling Information) are disturbed easily and are made a mistake; therefore necessary encipherment protection; and known third generation mobile system is between mobile device end (Mobile Equipment) and net control station (Radio Network Control), and (Ciphering Method) encrypts related data by an encryption method.Please refer to Fig. 1, Fig. 1 is the encrypt and decrypt schematic diagram of known third generation mobile system.In transmission ends, data such as encryption key (Ciphering Key) CK, counting (Count) COUNT-C, bearing identification field (BearerIdentifier) BEARER, direction signs field (Direction Identifier) DIRECTION and Length Indication field (Length Indicator) LENGTH draw a plurality of key string blocks (Keystream Block) KEYSTREAM by the F8 algorithm, and key string block KEYSTREAM encrypts with plaintext (Plain Text) block PLAIN-TEXT and obtains ciphertext (Cipher Text) block CIPHER-TEXT.The receiving terminal key string block that then but mat is identical with transmission ends is decrypted ciphertext (Cipher Text) block that is received, thereby obtains expressly block.Wherein, except counting COUNT-C was dynamically change, other parameter just determined before the encryption stage begins, and all keeps fixing in the encryption stage.The length of counting COUNT-C is 32, and it comprises Hyper Frame Number (Hyper Frame Number) HFN and sequence number (Sequence Number) SN two parts.When numerical value that the expression figure place that surpasses sequence number SN can be represented, sequence number SN can restart to add up from opening initial value (0), and the while, Hyper Frame Number HFN can be added 1.For instance, as sequence number SN during by seven bit representations, that is sequence number SN can count 0 to 127 in regular turn.In case sequence number SN surpasses at 127 o'clock, Hyper Frame Number HFN will be added 1, and sequence number SN is then again by 0 beginning.Do not jump number generation because of having this moment, and sequence number is returned at 0 o'clock again by 127, and two sequence numbers are considered as continuously.Sequence number SN is embedded in each protocol Data Unit (Protocol Data Unit), and the initial value that opens of Hyper Frame Number HFN is then just appointed by transmission ends and receiving terminal before encryption.Therefore, according to the sequence number SN of each protocol Data Unit, transmission ends and receiving terminal keep the synchronous of HFN respectively at the Hyper Frame Number HFN that adds up opportune moment each other with order, guarantee carrying out smoothly of encryption and decryption.
In the WCDMA communications protocol, the L1 layer under the wireless link key-course comprises verbose the checking of circulation, and (Cyclic Redundancy Check, CRC) mechanism is in order to check the correctness of the protocol Data Unit that is received.When finding mistake by the verbose verification mechanism that circulates, protocol Data Unit makes a mistake between the expression transmission period, and therefore the protocol Data Unit that makes a mistake can be dropped, delete and can not reach last layer.On the contrary, if do not have when circulation is verbose checks mistake, then the protocol Data Unit that receiving terminal received can be reached the wireless link key-course, to carry out subsequent treatment.
Generally speaking, the verbose field of checking that circulates comprises 12 or 16, and error of transmission takes place in the zone of therefore possible sequence number SN, but the verbose verification mechanism that circulates can't be checked out this mistake.Said circumstances is called " mistake that exceeds the verbose verification mechanism detection range that circulates ", if sequence number SN exceeds the mistake of the verbose verification mechanism detection range that circulates, then the Hyper Frame Number HFN of transmission ends and receiving terminal understands asynchronous and produces a series of mistake.Be shown example with sequence number SN by seven bit tables, if the sequence number SN of a sequence protocol Data Unit of transmission ends output is 0,1,2,3,4 in regular turn, 5..., and this moment Hyper Frame Number HFN=1.When the block generation error of transmission of SN=3 and exceed the mistake of the verbose verification mechanism detection range that circulates, and make that the sequence number SN of the protocol Data Unit that receiving terminal received is 0,1,2,30,4 in regular turn, 5..., that is the sequence number SN of the 4th block of sequence number SN=3 becomes 30 originally.Because sequence number SN=30 and sequence number SN=2 are discontinuous, the transmission ends of known technology can be considered as the protocol Data Unit of sequence number SN=3 to 29 among the Hyper Frame Number HFN=1 losing (in fact not losing) in transmission course, and when receiving the protocol Data Unit of sequence number SN=4, receiving terminal can be considered as the protocol Data Unit of sequence number SN=4 the protocol Data Unit of next circulation (being Hyper Frame Number HFN=2) sequence number SN=4, therefore Hyper Frame Number HFN is added 1.That is to say, when receiving terminal receives the protocol Data Unit of sequence number SN=4, because sequence number SN=4 is less than sequence number SN=30, so receiving terminal can be considered as losing (in fact losing) with the sequence number SN=4 protocol Data Unit before to next sequence number cycle (Hyper Frame Number HFN=2) after the sequence number SN=30 among the Hyper Frame Number HFN=1.In other words, the Hyper Frame Number HFN of transmission ends and receiving terminal becomes asynchronous, even all protocol Data Units after the influence, and gross error takes place.In order to address the above problem, known technology also provides a kind of receiver window of setting to improve the method for the problems referred to above.But the method can cause protocol Data Unit to be lost by mistake and remove, for instance, if the size of receiver window is 40, and the sequence number SN=0 of the protocol Data Unit that is received, 1,2,30,4,5 ... 30,31,32..., that is the sequence number SN of the 4th protocol Data Unit makes a mistake.But because sequence number SN=30 still drops in the scope (2+1=3 to 3+40-1=42) of receiver window size 40 compared to sequence number SN=2, therefore receiver window can be with the protocol Data Unit deletion of sequence number SN=30, on the contrary the 5th to 31 protocol Data Unit that receives (sequence number SN=4 is to sequence number SN=30) thought by mistake not in receiver window scope (30+1=31 to 31+40-1=70), and with its deletion.In brief, when though receiver window can drop on outside the receiver window in the sequence number of a protocol Data Unit, with this protocol Data Unit deletion, but when the sequence number of an Error Protocol data cell dropped within the receiver window, known technology can wrong be deleted the protocol Data Unit that normally receives.
Summary of the invention
Therefore, main purpose of the present invention provides the method that a kind of detection exceeds the error of transmission of the verbose verification mechanism detection range that circulates, to improve the shortcoming of known technology.
The present invention discloses a kind of method of detected transmission mistake, be used in the receiving terminal of a mobile communcations system, detection exceeds the error of transmission of the verbose verification mechanism detection range that circulates, and this method includes: temporary in regular turn a plurality of protocol Data Units (Protocol Data Unit); Check the sequence number (Sequence Number) of these a plurality of protocol Data Units in regular turn; And when the sequence number of the last protocol Data Unit of the sequence number of a protocol Data Unit and this protocol Data Unit is discontinuous, and when the sequence number of the back protocol Data Unit of the sequence number of this protocol Data Unit and this protocol Data Unit is discontinuous, do not handle this protocol Data Unit and with this protocol Data Unit deletion.
The present invention also discloses the method that a kind of detection exceeds the error of transmission of the verbose verification mechanism detection range that circulates, be used in the receiving terminal of a mobile communcations system, detection exceeds the error of transmission of the verbose verification mechanism detection range that circulates, and this method includes: temporary in regular turn a plurality of protocol Data Units (Protocol DataUnit); Check the sequence number (Sequence Number) of continuous three protocol Data Units in these a plurality of protocol Data Units in regular turn, and the sequence number of establishing these continuous three protocol Data Units is a, b and c in regular turn; Whether the value of checking a, b and c meets (b-a+N) mod N+ (c-b+N) mod N＞=N, wherein N=2
k, k is the figure place of sequence number, mod represents remainder operation; And when the value of a, b and c meets (b-a+N) mod N+ (c-b+N) mod N＞=N, do not handle sequence number and be the protocol Data Unit of b and with this protocol Data Unit deletion.
Description of drawings
Fig. 1 is the encrypt and decrypt schematic diagram of known third generation mobile system.
Fig. 2 is the flow chart of first embodiment of the invention detected transmission mistake.
Fig. 3 is the flow chart of second embodiment of the invention detected transmission mistake.
Embodiment
Please refer to Fig. 2, Fig. 2 is the schematic diagram of the flow process 20 of first embodiment of the invention detected transmission mistake.Flow process 20 is used in the receiving terminal of a mobile communcations system, detects the error of transmission that exceeds the verbose verification mechanism detection range that circulates.Flow process 20 includes following steps:
Step 200: beginning;
Step 202: temporary in regular turn a plurality of protocol Data Units (Protocol Data Unit);
Step 204: the sequence number (Sequence Number) of checking these a plurality of protocol Data Units in regular turn;
Step 206: when the sequence number of the last protocol Data Unit of the sequence number of a protocol Data Unit and this protocol Data Unit is discontinuous, and when the sequence number of the back protocol Data Unit of the sequence number of this protocol Data Unit and this protocol Data Unit is discontinuous, do not handle this protocol Data Unit and with this protocol Data Unit deletion;
Step 208: finish.
According to flow process 20, the present invention is when the sequence number SN of sequence number SN that detects a protocol Data Unit and front and back protocol Data Unit is all discontinuous, with this protocol Data Unit deletion, therefore can avoid wrong deletion protocol Data Unit and the mistake Hyper Frame Number HFN that adds up, also can avoid exceeding the error of transmission of verbose verification mechanism detection range of circulating.Particularly for the situation of wireless link control operation under Unacknowledged Mode, because real-time Transmission and bag order are all had requirement, therefore to the synchronous special requirement of Hyper Frame Number HFN between transmission ends and receiving terminal.What pay special attention to is, the present invention only when the sequence number SN of a protocol Data Unit is simultaneously discontinuous with the sequence number SN of front and back protocol Data Unit, just can delete this protocol Data Unit.Otherwise, if the sequence number SN of a protocol Data Unit only when discontinuous, does not then meet the condition that the present invention deletes protocol Data Unit with a front or rear sequence number SN.
For instance, if the sequence number SN of a sequence protocol Data Unit of transmission ends output is 0,1,2,3,4 in regular turn, 5..., and this moment Hyper Frame Number HFN=1.When error of transmission taking place and exceeding the mistake of the verbose verification mechanism detection range that circulates, and make that the sequence number SN of the protocol Data Unit that receiving terminal received is 0,1,2,30,4 in regular turn, 5..., that is the sequence number SN of the 4th the data block of sequence number SN=3 becomes 30 originally.Flow process 20 according to the present invention, and sequence number SN=30 and sequence number SN=2 are discontinuous, and is also discontinuous with sequence number SN=4, therefore the protocol Data Unit of sequence number SN=30 can be deleted, and Hyper Frame Number HFN can not added up and be kept 1, therefore can keep normal running, and carry out subsequent treatment.
Therefore compared to known technology, the present invention can detect the error of transmission that exceeds the verbose verification mechanism detection range that circulates, and can avoid add up Hyper Frame Number HFN and avoid wrong deletion protocol Data Unit of mistake, thereby promote receiving efficiency, improves the shortcoming of known technology.
Therefore, according to flow process 20, the present invention can delete the discontinuous protocol Data Unit of sequence number, to increase receiving efficiency.Yet the discontinuous of the sequence number of protocol Data Unit may be that simple block errors by protocol Data Unit is caused, and in this case, first embodiment of the invention flow process 20 may be deleted correct protocol Data Unit.For instance, if the sequence number SN of a sequence protocol Data Unit of transmission ends output is 0,1,2,3,4 in regular turn, 5..., because the block errors of error of transmission or protocol Data Unit, make the sequence number SN of the protocol Data Unit that receiving terminal received be 0,1,2,30,4,6,7 in regular turn ..., wherein the sequence number SN of the 4th protocol Data Unit becomes 30 by 3, and the protocol Data Unit of sequence number SN=5 is lost.At this moment, if according to flow process 20, then because the sequence number SN=2 of sequence number SN=30 and front and back and 4 discontinuous, therefore the protocol Data Unit of sequence number SN=30 can be deleted, simultaneously, sequence number SN=4 also with the sequence number SN=2 of front and back and 6 discontinuous, so the protocol Data Unit of sequence number SN=4 also can be deleted, that is the protocol Data Unit of sequence number SN=4 can be by wrong deletion.In order to improve the problems referred to above, the present invention also provides a method.Please refer to Fig. 3, Fig. 3 is the schematic diagram of the flow process 30 of second embodiment of the invention detected transmission mistake.Flow process 30 is used in the receiving terminal of a mobile communcations system, detects the error of transmission that exceeds the verbose verification mechanism detection range that circulates.Flow process 30 includes following steps:
Step 300: beginning;
Step 302: temporary in regular turn a plurality of protocol Data Units (Protocol Data Unit);
Step 304: check the sequence number (Sequence Number) of continuous three protocol Data Units in these a plurality of protocol Data Units in regular turn, and the sequence number of establishing these continuous three protocol Data Units is a, b and c in regular turn;
Step 306: whether the value of checking a, b and c meets (b-a+N) mod N+ (c-b+N) modN＞=N, wherein N=2
k, k is the figure place of sequence number, mod represents remainder operation;
Step 308: when the value in a, b and c meets (b-a+N) mod N+ (c-b+N) mod N＞=N, do not handle sequence number and be the protocol Data Unit of b and with this protocol Data Unit deletion;
Step 310: finish.
According to flow process 30, the present invention checks whether sequence number a, the b of continuous three protocol Data Units and the value of c meet formula: (b-a+N) mod N+ (c-b+N) mod N＞=N, when meeting this formula with value in a, b and c, do not handle sequence number and be the protocol Data Unit of b and, deleted to avoid correct protocol Data Unit with this protocol Data Unit deletion.For instance, for a system that uses seven sequence number SN, if the sequence number SN of a sequence protocol Data Unit of transmission ends output is 0,1,2,3,4 in regular turn, 5..., because the block errors of error of transmission or protocol Data Unit, make the sequence number SN of the protocol Data Unit that receiving terminal received be 0,1,2,30,4,6,7 in regular turn ..., wherein the sequence number SN of the 4th protocol Data Unit becomes 30 by 3, and the protocol Data Unit of sequence number SN=5 is lost.According to flow process 30, for first three sequence number SN=0,1,2, because (1-0+128) mod 128+ (2-1+128) mod 128=1+1=2＜128, so sequence number SN=0,1,2 is not inconsistent above-mentioned formula, and in like manner sequence number SN=1,2,30 does not also meet following formula.For sequence number SN=2,30,4, (30-2+128) mod 128+ (4-30+128) mod 128=28+102=130＞128, therefore sequence number SN=2,30,4 meets the condition that flow process 30 of the present invention sets, so the protocol Data Unit of sequence number SN=30 can be deleted.Further, for sequence number SN=2,4,6 (protocol Data Unit of sequence number SN=30 is deleted), because therefore (4-2+128) mod 128+ (6-4+128) mod 128=2+2=4＜128 do not meet the condition that protocol Data Unit is deleted in the flow process 30.
Compared to flow process 20, flow process 30 not only can be avoided the mistake Hyper Frame Number HFN that adds up, and also can prevent the discontinuous situation of the sequence number that block errors caused because of protocol Data Unit, to promote receiving efficiency, saves system cost, improves the shortcoming of known technology.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (7)
1. a detection exceeds the method for the error of transmission of the verbose verification mechanism detection range that circulates, and is used in the receiving terminal of a mobile communcations system, detects the error of transmission that exceeds the verbose verification mechanism detection range that circulates, and this method includes:
Temporary in regular turn a plurality of protocol Data Units;
Check the sequence number of these a plurality of protocol Data Units in regular turn; And
When the sequence number of the last protocol Data Unit of the sequence number of a protocol Data Unit and this protocol Data Unit is discontinuous, and when the sequence number of the back protocol Data Unit of the sequence number of this protocol Data Unit and this protocol Data Unit is discontinuous, do not handle this protocol Data Unit and with this protocol Data Unit deletion.
2. the method for claim 1, wherein these a plurality of protocol Data Units protocol Data Unit that is unacknowledged mode data.
3. the method for claim 1, wherein the sequence number of two protocol Data Units is the value of the maximum expression scope of sequence number and 0 o'clock in regular turn, is considered as continuously.
4. the method for claim 1, the condition when the sequence number of the last protocol Data Unit of the sequence number of a protocol Data Unit and this protocol Data Unit is discontinuous also includes:
Or this receiving terminal on this transmission channel, received open the beginning first protocol Data Unit the non-agreement of sequence number open initial value the time.
5. method as claimed in claim 4, the initial value that opens of this agreement is 0.
6. a detection exceeds the method for the error of transmission of the verbose verification mechanism detection range that circulates, and is used in the receiving terminal of a mobile communcations system, detects the error of transmission that exceeds the verbose verification mechanism detection range that circulates, and this method includes:
Temporary in regular turn a plurality of protocol Data Units;
Check the sequence number of continuous three protocol Data Units in these a plurality of protocol Data Units in regular turn, and the sequence number of establishing these continuous three protocol Data Units is a, b and c in regular turn;
Whether the value of checking a, b and c meets (b-a+N) mod N+ (c-b+N) mod N＞=N, wherein N=2
k, k is the figure place of sequence number, mod represents remainder operation; And
When the value in a, b and c meets (b-a+N) mod N+ (c-b+N) mod N＞=N, do not handle sequence number and be the protocol Data Unit of b and with this protocol Data Unit deletion.
7. method as claimed in claim 6, this k value is 7.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US59356005P | 2005-01-26 | 2005-01-26 | |
| US60/593,560 | 2005-01-26 | ||
| US60/593,662 | 2005-02-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1812306A true CN1812306A (en) | 2006-08-02 |
| CN100391143C CN100391143C (en) | 2008-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510065203XA Expired - Fee Related CN100391143C (en) | 2005-01-26 | 2005-04-14 | Method of crc residue error detection and handling |
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| CN (1) | CN100391143C (en) |
| TW (1) | TWI254521B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101686494B (en) * | 2008-09-22 | 2012-07-04 | 电信科学技术研究院 | Method and device for processing packets by packet data convergence protocol (PDCP) layer |
| CN107148025A (en) * | 2016-03-01 | 2017-09-08 | 深圳市中兴微电子技术有限公司 | A kind of data package processing method and device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6798842B2 (en) * | 2001-01-10 | 2004-09-28 | Asustek Computer Inc. | Retransmission range for a communications protocol |
| US7054316B2 (en) * | 2001-04-25 | 2006-05-30 | Nokia Corporation | Method and system for interlayer control between re-sequencing and retransmission entities |
| CN1173504C (en) * | 2001-12-27 | 2004-10-27 | 华为技术有限公司 | Transmission control method for high-speed data service when changing service small zone |
| EP1343267A3 (en) * | 2002-02-08 | 2005-08-03 | ASUSTeK Computer Inc. | Data transmission confirmation in a wireless communication system |
-
2005
- 2005-02-04 TW TW94103659A patent/TWI254521B/en not_active IP Right Cessation
- 2005-04-14 CN CNB200510065203XA patent/CN100391143C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101686494B (en) * | 2008-09-22 | 2012-07-04 | 电信科学技术研究院 | Method and device for processing packets by packet data convergence protocol (PDCP) layer |
| CN107148025A (en) * | 2016-03-01 | 2017-09-08 | 深圳市中兴微电子技术有限公司 | A kind of data package processing method and device |
| CN107148025B (en) * | 2016-03-01 | 2020-08-28 | 深圳市中兴微电子技术有限公司 | Data packet processing method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200627851A (en) | 2006-08-01 |
| CN100391143C (en) | 2008-05-28 |
| TWI254521B (en) | 2006-05-01 |
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