CN101753253A - Method, equipment and system for encoding and decoding of GSM (global system for mobile communications) packet-switched domain - Google Patents

Method, equipment and system for encoding and decoding of GSM (global system for mobile communications) packet-switched domain Download PDF

Info

Publication number
CN101753253A
CN101753253A CN 200810182901 CN200810182901A CN101753253A CN 101753253 A CN101753253 A CN 101753253A CN 200810182901 CN200810182901 CN 200810182901 CN 200810182901 A CN200810182901 A CN 200810182901A CN 101753253 A CN101753253 A CN 101753253A
Authority
CN
China
Prior art keywords
length
coding
rlc
decoding
mac
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN 200810182901
Other languages
Chinese (zh)
Other versions
CN101753253B (en
Inventor
薛怀杰
王超
张岩强
胡宁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN 200810182901 priority Critical patent/CN101753253B/en
Priority to PCT/CN2009/075231 priority patent/WO2010063231A1/en
Publication of CN101753253A publication Critical patent/CN101753253A/en
Application granted granted Critical
Publication of CN101753253B publication Critical patent/CN101753253B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/009—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location arrangements specific to transmitters
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a method, equipment and a system for the encoding and decoding of a GSM (global system for mobile communications) packet-switched domain. The method comprises the following steps of: judging whether the information of a valid data length loaded by an indication exists in a control domain in a radio link control/medium access control (RLC/MAC) block header, wherein the valid data length is the length of data input before encoding; and when the information of the valid data length exists in the control domain in the RLC/MAC block header, elongating channel coding according to the data length before encoding and the data length after encoding. Because the length information indicating the valid data is added in the control domain in the method, a sending terminal can elongate coding based on the valid data length, and a receiving terminal can elongate decoding based on the valid data length. Because the data length loaded in the RCL/MAC block is variable, an idle byte or an invalid padding bytes can be avoided in a loaded frame, thereby saving limited bandwidth resources and improving the link performance.

Description

Method, equipment and the system of the encoding and decoding of GSM packet domain
Technical field
The present invention relates to network communications technology field, method, equipment and the system of the encoding and decoding of particularly a kind of GSM packet domain.
Background technology
Existing global system for mobile communications (GSM, Global System for Mobile Communications) packet domain (PS, Packet Switched domain) adopts fixing Radio Link control or medium access control system (RLC/MAC, Radio Link Control/Medium Access Control) coded system is carried LLC Packet Data Unit (LLC PDU, Logical Link Control Packet DataUnit).Enhanced data rates for gsm evolution technology (EDGE for example, Enhanced Data Rates forGSM Evolution) in the network modulation coding mode MCS-1～MCS-9 (MCS is arranged, Modulation andCoding Scheme) totally nine kinds of RLC/MAC coded systems, every kind of RLC/MAC coded system has fixing length.The mode of LLC PDU The data segmentation cascade is carried in the described RLC/MAC piece.
GSM EDGE wireless access network (GERAN, GSM EDGE Radio Access Network) bearer circuit territory (CS, Circuit Switched domain) speech business is to utilize RLC/MAC piece carrying CS frame.Because the self-adaption multi-speed encoding/decoding (AMR in CS territory, Adaptive Multi-Rate codec) speed and packet domain (PS, Packet Switched Domain) RLC speed does not match, so generally, LLC PDU data length summation can't be filled up current RLC/MAC piece.
In the prior art, when all remaining LLC PDU data length summations can't be filled up current RLC/MAC piece, adopt the mode of filling the 0x2B slack byte to fill up whole RLC/MAC piece.But adopt 0x2B slack byte of the prior art to fill remaining space, the bandwidth resources that waste is limited.When chnnel coding, can't utilize remaining space further to increase redundancy.Especially little in the current business data traffic, and LLC PDU data length hour, the probability that occurs filling slack byte in the RLC/MAC piece is very big, utilizes existing filling technique can't promote link transmission performance.
Summary of the invention
The embodiment of the invention provides method, equipment and the system of a kind of GSM packet domain encoding and decoding, saves limited bandwidth resources, has improved link transmission performance.
The embodiment of the invention provides the method for a kind of GSM packet domain encoding and decoding, comprising: judge Radio Link
The information that whether has the valid data length of indication carrying in the control domain in the control/medium access control system RLC/MAC build, described valid data length is the length of the preceding input of coding data; When having the information of described valid data length in the control domain in the described RLC/MAC build,, carry out elongated chnnel coding according to the length of input data before the coding and the length of coding back dateout.
The embodiment of the invention also provides a kind of GSM packet domain encoding device, comprising: judging unit and elongated chnnel coding unit.Described judging unit is used for judging the information that whether has the valid data length of indication carrying in the control domain of Radio Link control/medium access control system RLC/MAC build, described valid data length for coding before the length of input data; Described elongated chnnel coding unit, when being used for judged result when described judging unit and being having the information of described valid data length in the control domain of described RLC/MAC build, carry out elongated chnnel coding according to the length of input data before the coding and the length of coding back dateout.
The embodiment of the invention also provides the system of a kind of GSM packet domain encoding and decoding, and described system comprises above-mentioned encoding device, also comprises receiving terminal; Described receiving terminal is used for after the data that receive described equipment transmission, carries out elongated channel-decoding according to the length of input data before the described decoding and the length of decoding back dateout.
Above technical scheme, the information of the length of the valid data of increase indication RLC/MAC piece carrying in the control domain in the RLC/MAC build, all the length with described valid data is identical to import the length of data and the length of decoding back dateout before the coding.Transmitting terminal carries out elongated chnnel coding according to the length of the preceding input of coding data and the length of coding back dateout.Receiving terminal according to described decoding before the length of input data and the length of decoding back dateout carry out elongated channel-decoding.Method provided by the invention is owing to increased the length information of indication valid data in control domain, transmitting terminal can carry out variable-length encoding according to valid data length, and receiving terminal carries out variable length decoding according to valid data length.Because data carried by data length is variable in the RLC/MAC piece, occurs idle bit or invalid byte of padding in the frame of avoiding carrying, thereby has saved limited bandwidth resources, has improved link performance.
Description of drawings
Fig. 1 is based on the inventive method first embodiment flow chart;
Fig. 2 is based on RLC/MAC the form schematic diagram of the descending CS over of embodiment of the invention GMSK GERAN;
Fig. 3 is based on RLC/MAC the form schematic diagram of the descending CS over of embodiment of the invention 8PSK GERAN;
Fig. 4 is based on RLC/MAC the form schematic diagram of the up CS over of embodiment of the invention GMSK GERAN;
Fig. 5 is based on RLC/MAC the form schematic diagram of the up CS over of embodiment of the invention 8PSK GERAN;
Fig. 6 is based on the inventive method second embodiment schematic diagram;
Fig. 7 is based on the elongated channel coding/decoding schematic diagram of two 5.9kb/s AMR frames of embodiment of the invention CS over GERAN carrying;
Fig. 8 is based on the present device first example structure figure;
Fig. 9 is based on the present device second example structure figure;
Figure 10 is based on the first example structure figure of system of the present invention;
Figure 11 is based on the second example structure figure of system of the present invention.
Embodiment
At first the embodiment of the invention is realized that the method for a kind of GSM packet domain encoding and decoding describes, and comprising:
Judge the information of the valid data length that whether has the indication carrying in the control domain in the Radio Link control/medium access control system RLC/MAC build, described valid data length is the length of the preceding input of coding data; When having the information of described valid data length in the control domain in the described RLC/MAC build,, carry out elongated chnnel coding according to the length of input data before the coding and the length of coding back dateout.Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
Method embodiment one:
Referring to Fig. 1, this figure is based on the inventive method first embodiment flow chart.
Method first embodiment of a kind of GSM packet domain of the present invention encoding and decoding may further comprise the steps:
S101: the information that increases the length of the valid data that carry in the described RLC/MAC piece of indication in the control domain in the head of RLC/MAC piece.
Wherein, all the length with described valid data is identical to import the length of data and the length of decoding back dateout before the coding.
The information of the length of the valid data that carry in the indication RLC/MAC piece specifically can be represented with two kinds of indication informations, such as: the coding mode indication (CMI that is used to indicate AMR, Code Mode Indicator) and the number frame number of frame (FN, Frame Number).Wherein, CMI is used for indicating the AMR pattern of current each CS frame of RLC/MAC piece, can be obtained the length of each frame by the AMR pattern of each frame.FN is used for indicating the number of the CS frame that current RLC/MAC piece carries.
Need to prove that each CS frame in the RLC/MAC piece can use different AMR patterns, also can use identical AMR pattern.The CS frame number of carrying in the RLC/MAC piece can be for one or more.
The number that the length of each frame multiply by the valid frame of FN indication is the length of the valid data that carry in the RLC/MAC piece.
Just can calculate the length of data carried by data in the RLC/MAC piece by the number of the frame of the AMR pattern of CMI indication and FN indication.So,, can indicate the length of valid data by the combination of CMI and FN.Certainly, except the mode of the combination of using CMI and FN, the identification means of other expression valid data length informations can also be arranged.
Need to prove that described CMI and FN can select the position in the RLC/MAC head.
S102: carry out elongated chnnel coding according to the length of input data before the coding and the length of coding back dateout.
Concrete, according to the length of input data before the coding and the length of coding back dateout, selective channel coding method and speed.According to elongated punching algorithm or filling redundant arithmetic, carry out elongated chnnel coding then by punching or filling redundancy.
For example, when the difference of the length of input data before the coding and the length of coding back dateout within the specific limits the time, described channel coding rate can be selected 1/2 or 1/3 convolution code.
Need to prove that when the difference of the length of the length of input data and coding back dateout changed before the coding, described chnnel coding also can be selected the convolution code of other speed.
At receiving terminal, can also comprise the step of decoding:
S103: the length according to length of importing before the described decoding and decoding back dateout is carried out elongated channel-decoding.
According to the control domain in the head of RLC/MAC piece, obtain the length of decoding back dateout, the length of decoding back dateout is identical with the length of valid data.According to the length of dateout after the length of importing data before the decoding and the described decoding, extrapolate the punching of using when encoding or fill redundant method, carry out correct elongated channel-decoding.
The GSM packet domain decoding method that the embodiment of the invention provides, because control domain has increased the information of the length of indication valid data, transmitting terminal can carry out elongated chnnel coding according to valid data length, receiving terminal carries out variable length decoding according to valid data length.Owing to adopt elongated chnnel coding, therefore data carried by data idle bit can not occur in the RLC/MAC piece, and then avoid occurring invalid byte of padding, thereby the RLC/MAC coding method of distinguishing traditional PS territory (for example, MCS-1～MCS-9), save limited bandwidth resources, improved link performance.
Describe the form of the up-downgoing RLC/MAC of the described CS over of embodiment of the invention GERAN variable-length code decode in detail below in conjunction with accompanying drawing.The head type of described RLC/MAC is relevant with modulation system.The modulation system difference, the length difference of the head type of described RLC/MAC.
Referring to Fig. 2, this figure is a RLC/MAC form schematic diagram based on the descending CS over of embodiment of the invention GMSK GERAN.
Be RLC/MAC form of example explanation with the descending CS over GERAN of Gaussian Minimum Shift-frequency Keying (GMSK, Gaussian Minimum Shift-frequencyKeying) below.
As can be seen from Figure 2, increased CMI and the FN that indicates the valid data length in RLC/MAC form.
Need to prove, be to comprise four CMI in the form of a RLC/MAC shown in Fig. 2, is respectively CMI1, CMI2, CMI3 and CMI4, is used for indicating 4 CS frames of a RLC/MAC piece carrying, and the different AMR pattern of each CMI representative.Certainly, the AMR pattern of each CS frame that carries in RLC/MAC piece can be identical, and promptly the numerical value of four CMI is identical.
Need to prove that the number of the CS frame that carries in RLC/MAC piece can be selected, and is the data of having carried 4 CS frames in the RLC/MAC piece shown in Fig. 2.
FN represents effective number of the CS frame that carries in the RLC/MAC piece, for example FN is 3, represent that then CMI1, CMI2 and CMI3 are effective frame patterns, promptly the length of the valid data that carry in the RLC/MAC piece only comprises the length of the frame of CMI1, CMI2 and CMI3 representative.In like manner, if FN is 2, then the length of valid data only comprises the length of the frame of CMI1 and CMI2 representative.
Need to prove, other coding can be identical with traditional PS coding in the form of RLC/MAC, for example the uplink state among Fig. 2 identifies (USF, Uplink State Flag) and temporary flow identity (TFI, Temporary Flow Identity) coding can be identical with original PS coding.Wherein, USF is used to dispatch the up of each user.
Referring to Fig. 3, this figure is a RLC/MAC form schematic diagram based on the descending CS over of embodiment of the invention 8PSK GERAN.
With Fig. 2 type, shown in Figure 3 is that descending CS over GERAN with phase phase-shift keying (8PSK, 8Phase Shift Keying 8) is that example is introduced RLC/MAC form.
The RLC/MAC of comparison diagram 2 an and Fig. 3 form, only the length of data is different in the head of GMSK and 8PSK as can be seen.The 4th byte of GMSK has 7, and the 4th byte of 8PSK only has 4.
Referring to Fig. 4, this figure is a RLC/MAC form schematic diagram based on the up CS over of embodiment of the invention GMSK GERAN.
Fig. 4 and Fig. 2 are similar, also comprise TFI, CMI and FN in the up RLC/MAC head.
Referring to Fig. 5, this figure is a RLC/MAC form schematic diagram based on the up CS over of the described 8PSK of embodiment of the invention GERAN.
The RLC/MAC that Fig. 5 and Fig. 4 a represent form is similar, and only the length of data is different in the head of GMSK and 8PSK as can be seen, and the 4th byte of GMSK has 7, and the 5th byte of 8PSK has 5.
Method embodiment two:
Referring to Fig. 6, this figure is based on the inventive method second embodiment flow chart.
Be that example is introduced elongated chnnel coding flow process of the present invention with CS over GERAN below.
S601: when judging that according to the TFI in the RLC/MAC head a current RLC/MAC form is GERAN form of CS over of elongated channel coding/decoding, read CMI and FN in the control domain, determine the length of the valid data of current data RLC/MAC piece.
Need to prove, can judge that by the numerical value of TFI a current RLC/MAC form is a traditional PS form or elongated chnnel coding form.
Can obtain the length of valid data by CMI and FN.
S602: the significant bits to each frame of carrying in the RLC/MAC piece is carried out cyclic redundancy check (CRC) (CRC, Cyclic Redundancy Check).
Need to prove that the significant bits of so-called each frame can be the Ia class Most Significant Bit of each frame, and check digit can be selected to be added in after each frame, also can select to be added in other positions of frame.The length of check digit also can be selected according to actual needs, for example can be 3bit, also can be 6bit.
Need to prove, compare that the present invention can save block check sequence (BCS, Block Check Sequence), thereby increase the length of CRC, significant data is protected with traditional AMR pattern.
Need to prove that the step of this CRC check is optional.
S603: USF and RLC/MAC head are encoded, and its coding form is identical with traditional PS coding, does not repeat them here.
S604: each frame that carries for the RLC/MAC piece adds tail bit (TB, Tail Bits).
Need to prove, removed BCS, the last piece indication (FBI, Final Block Indication) in the traditional PS coding in the form of the RLC/MAC among the present invention and expanded bit (E, Extension bit).
S605: each frame to the above-mentioned TB of adding carries out independently chnnel coding.
Each frame can utilize elongated punching or fill redundant arithmetic the adaptive of speed of eating dishes without rice or wine.
S606: in the time of coding, increase foremost and steal bit (SB, Steal Bits) at the CS frame of carrying, SB is used to indicate the head type of current RLC/MAC.
Can learn the head type of current RLC/MAC by the numerical value of SB, for example be GMSK or 8PSK.
Need to prove that during GMSK modulation mode, SB is 12bits; Under the 8PSK modulation mode, SB is 8bits.The head type difference of RLC/MAC, the then indicated bit length difference of SB.
S607: receiving terminal at first reads the head type that SB obtains RLC/MAC.
In this step, receiving terminal can at first read the head type that SB obtains RLC/MAC after the data that receive the back transmission of transmitting terminal coding.
S608: receiving terminal reads TFI to be judged when RLC/MAC form is elongated chnnel coding form, reads CMI and FN in the control domain, obtains the length of valid data, i.e. the length of decoding back dateout.
S609: according to the length of the preceding input of decoding data and the length of decoding back dateout, the CS frame that RLC/MAC is carried carries out elongated channel-decoding.
Receiving terminal is determined the number of the valid frame that carries in the RLC/MAC piece according to the value of FN, and obtains the length of each frame according to the AMR pattern of CMI indication.The receiving terminal valid frame of can only decoding obtains the length of valid data.
The method of elongated channel coding/decoding of the present invention has effectively been utilized the remaining space after the RLC/MAC piece carries the CS frame, further increases redundancy when channel coding/decoding, thereby promotes link transmission performance.And the described CS over of embodiment of the invention GERAN utilizes elongated channel coding/decoding, and most important bit in the RLC/MAC piece carrying CS frame is carried out CRC check, has improved the precision of transfer of data.
Be that example is introduced elongated channel coding/decoding of the present invention in detail with two 5.9kb/s AMR frames of CS over GERAN carrying below.
Referring to Fig. 7, this figure is the elongated channel coding/decoding schematic diagram based on two 5.9kb/sAMR frames of embodiment of the invention CS over GERAN carrying.
By among Fig. 7 as can be seen, CS over GERAN piece data carried by data comprises USF, RLC/MAC head, HCS, CRC, TB before the convolutional encoding, and two 5.9kb/s AMR frames (being the Data data division).
All add CRC and TB after each AMR frame.
Because each frame is an absolute coding,, be used for the interval protection between frame and the frame, so that carry out convolutional encoding so can add TB behind each frame.
The length of each indication is exemplified below: wherein USF can be 3bits; RLC/MAC head and HCS be 36bits altogether, and CRC can be that 6bits or 3bits, TB can be 6bits.
Each 5.9kb/s AMR frame comprises the data of 118bits.
All data except USF are carried out 1/3 convolutional encoding (Rate 1/3convolutionalcoding), carry out the adaptive of speed, obtain the data format after the convolutional encoding as shown in Figure 7.
Wherein USF is 12bits; RLC/MAC head and HCS be 108bits altogether.
Data after the convolutional encoding are punched (puncturing) by the punching algorithm, as shown in Figure 7, the data format after obtaining punching.
In addition, find out that steal bit SB adding foremost in the time of punching, this SB is used to indicate the head type of current RLC/MAC by Fig. 7.
Need to prove that during GMSK modulation mode, SB is 12bits; Under the 8PSK modulation mode, SB is 8bits.What present embodiment adopted is the GMSK modulation, so SB is 12bits.
After punching, RLC/MAC head and HCS be 68bits altogether; CRC, TB and an AMR frame are total to 186bits.
Can get thus, after the described elongated chnnel coding of the employing embodiment of the invention, the code check of valid data is 118bits/186bits=63.4%.If adopt the AMR frame of traditional two 5.9kb/s of MCS-3 carrying, then code check is 80%.As can be seen, at the elongated channel coding method of CS over GERAN business, improved the transmission performance of link greatly.
The foregoing description is that example is illustrated elongated channel coding/decoding with two 5.9kb/s AMR frames of CS over GERAN carrying only.Need to prove that CS over GERAN can carry one or more frames, wherein the AMR pattern of frame can be selected.When CS over GERAN carried a plurality of AMR frame, the AMR pattern of each frame can be identical, also can be inequality.If the AMR pattern difference of each frame because each frame all is absolute coding, therefore when each frame pattern be length not simultaneously, can increase the redundancy of different length by its length ratio to every frame.Like this, also can carry out independent decoding to every frame at receiving terminal according to length ratio.
The method of the elongated channel coding/decoding of two 5.9kb/s AMR frames of CS over GERAN carrying that the embodiment of the invention provides, owing to increase the length of control domain indication valid data, transmitting terminal can carry out variable-length encoding according to valid data length, and receiving terminal carries out variable length decoding according to valid data length.Data carried by data idle bit can not occur in the RLC/MAC piece, and then avoids invalid byte of padding occurring, and (for example, MCS-1～MCS-9), saved limited bandwidth resources has improved link performance thereby distinguish the RLC/MAC coding method in traditional PS territory.Need to prove that the method for GSM packet domain of the present invention encoding and decoding is not only applicable to CS over GERAN business, and be applicable to traditional PS business.When the method for the invention is used in the traditional PS business, because the length of data is fixed in the traditional PS business, therefore, can utilize elongated channel coding method of the present invention that clearance spaces except valid data in the fixed data length is carried out redundancy, and then improve link performance.
The embodiment of the invention provides a kind of GSM packet domain encoding device.
Apparatus embodiments one:
Referring to Fig. 8, this figure is based on the present device first embodiment schematic diagram.
The invention provides a kind of GSM packet domain encoding device, comprising: judging unit 801 and elongated chnnel coding unit 802.
Described judging unit 801 is used for judging the information that whether has the valid data length of indication carrying in the control domain of Radio Link control/medium access control system RLC/MAC build, described valid data length for coding before the length of input data.
Elongated chnnel coding unit 802, when being used for judged result when judging unit 801 and being having the information of above-mentioned valid data length in the control domain of RLC/MAC build, carry out elongated chnnel coding according to the length of input data before the coding and the length of coding back dateout.
Increase the information of the valid data length of carrying in the indication RLC/MAC piece in the control domain of RLC/MAC build, wherein, the length of valid data is identical with the length of the preceding input of coding data.And the length of decoding back dateout also is the length of these valid data, that is, its length is identical with valid data length.Concrete, the information of valid data length can comprise CMI and FN.Wherein, CMI is used for indicating the AMR pattern of current each CS frame of RLC/MAC piece.Need to prove that each CS frame in the RLC/MAC piece can use no AMR pattern, also can use identical AMR pattern.In addition, FN is used for indicating the number of effective CS frame that current RLC/MAC piece carries.Need to prove that the CS frame number of carrying in the RLC/MAC piece can be for one or more.Be understandable that, just can calculate the length of data carried by data in the RLC/MAC piece by the number of the frame of the AMR pattern of CMI indication and FN indication.
During specific implementation, elongated chnnel coding unit 802 can comprise two subelements, is respectively first subelement and the second subelement (not shown).
Wherein, first subelement is used for selecting elongated channel coding rate according to the length of input data before the coding and the length of coding back dateout; Second subelement is used for carrying out elongated chnnel coding according to the elongated channel coding rate that first subelement is selected, and for example, described channel coding rate can be selected 1/2 or 1/3 convolution code.Certainly, also can select the convolution code of other speed.Concrete, second subelement can be selected elongated punching algorithm or fill redundant arithmetic, carries out elongated chnnel coding by punching or filling redundancy.
After the data behind the coding sent to receiving terminal, receiving terminal can obtain the length of decoding back dateout according to the control domain in the head of RLC/MAC piece.Then,, extrapolate the punching of using when encoding or fill redundant method, carry out correct elongated channel-decoding according to the length (being the valid data length) of dateout after the length of importing data before the decoding and the described decoding.
The GSM packet domain encoding device that the embodiment of the invention provides, owing to increased the information of the length of indication valid data in the control domain, transmitting terminal can carry out variable-length encoding according to valid data length, receiving terminal carries out variable length decoding according to valid data length.After the technical scheme that the employing embodiment of the invention provides, data carried by data length is variable in the RLC/MAC piece, like this, occurs idle bit or invalid byte of padding in the frame that can avoid carrying, thereby saved limited bandwidth resources, improved link performance.
Apparatus embodiments two:
Referring to Fig. 9, this figure is based on the present device second embodiment schematic diagram.
The difference of present device second embodiment and first embodiment is to have increased: verification unit 901, this unit can carry out cyclic redundancy check (CRC) to significant bits before elongated chnnel coding unit 802 carries out elongated chnnel coding according to the length of the length of input data before encoding and the back dateout of encoding.
Need to prove that check digit can be selected to be added in after each frame, also can select to be added in other positions of frame.In addition, above-mentioned significant bits specifically can be an Ia class Most Significant Bit.
Further, can also comprise in the equipment: the tail bit increases the unit, is used for each frame is increased TB.
In addition, in coding, can increase SB foremost at the CS frame of carrying.SB is used to indicate the head type of current RLC/MAC.
GSM packet domain encoding device of the present invention has effectively utilized the remaining space after the RLC/MAC piece carries the CS frame, further increases redundancy when channel coding/decoding, thereby promotes link transmission performance.And the described CS over of embodiment of the invention GERAN utilizes elongated channel coding/decoding, and most important bit in the RLC/MAC piece carrying CS frame is carried out CRC check, has improved the precision of transfer of data.
The embodiment of the invention provides the system of a kind of GSM packet domain encoding and decoding.
System embodiment one:
Referring to Figure 10, this figure is based on the system of the present invention first embodiment schematic diagram.
The invention provides the system of a kind of GSM packet domain encoding and decoding, comprise transmitting terminal 1001 and receiving terminal 1002.
Need to prove that transmitting terminal 1001 can be a GSM packet domain encoding device among the said equipment embodiment, repeats no more herein.
Receiving terminal 1002 after being used to receive the data of said GSM packet domain encoding device transmission, carries out elongated channel-decoding according to the length of input data before the described decoding and the length of decoding back dateout.
Concrete, receiving terminal can be extrapolated punching or the redundant method of filling that encoding device uses, thereby carry out correct elongated channel-decoding at receiving terminal according to the length of input data and the length of valid data before decoding when coding.
The system of the GSM packet domain encoding and decoding that the embodiment of the invention provides, owing to increased the information of the length of indication valid data in the control domain, transmitting terminal can carry out variable-length encoding according to valid data length, receiving terminal carries out variable length decoding according to valid data length.Data carried by data length is variable in the RLC/MAC piece, occurs idle bit or invalid byte of padding in the frame of avoiding carrying, thereby has saved limited bandwidth resources, has improved link performance.
System embodiment two:
Referring to Figure 11, this figure is based on the system of the present invention second embodiment schematic diagram.
Transmitting terminal 1001 in the present embodiment comprises that judging unit 1001a, verification unit 1001b, tail bit increase unit 1001c and elongated chnnel coding unit 1001d.
Described judging unit 1001a is used for judging the information that whether has the valid data length of indication carrying in the control domain of Radio Link control/medium access control system RLC/MAC build, described valid data length for coding before the length of input data.
Described verification unit 1001b is used for Ia class Most Significant Bit is carried out cyclic redundancy check (CRC).Check digit can be added in after each frame, also can be added in other positions of each frame.
Described tail bit increases unit 1001c, and being used for increases the tail bit to each frame.Need to prove, in the time of coding, increase SB foremost at the CS frame that carries.SB is used to indicate the head type of current RLC/MAC.
Elongated chnnel coding unit 1001d, when being used for judged result as judging unit 1001a and being having the information of above-mentioned valid data length in the control domain of RLC/MAC build, carry out elongated chnnel coding according to the length of input data before the coding and the length of coding back dateout.
Receiving terminal 1002 is identical with system embodiment one, does not repeat them here.
The system of variable-length code decode of the present invention has effectively utilized the remaining space after the RLC/MAC piece carries the CS frame, further increases redundancy when channel coding/decoding, thereby promotes link transmission performance.And the described CS over of embodiment of the invention GERAN utilizes elongated channel coding/decoding, and most important bit in the RLC/MAC piece carrying CS frame is carried out CRC check, has improved the precision of transfer of data.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the said method execution mode is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program can comprise the content of aforesaid each execution mode of communication means when carrying out.Here the alleged storage medium that gets, as: ROM/RAM, magnetic disc, CD etc.
In sum, the method for a kind of GSM packet domain encoding and decoding that the embodiment of the invention provided, the information of the length of the valid data of increase indication RLC/MAC piece carrying in the control domain of RLC/MAC build.All the length with described valid data is identical for the length of the length of input data and decoding back dateout before the coding.Transmitting terminal carries out elongated chnnel coding according to the length of the preceding input of coding data and the length of coding back dateout.Receiving terminal according to described decoding before the length of input data and the length of decoding back dateout carry out elongated channel-decoding.Method provided by the invention is owing to increase the length of control domain indication valid data, and transmitting terminal can carry out variable-length encoding according to valid data length, and receiving terminal carries out variable length decoding according to valid data length.Data carried by data length is variable in the RLC/MAC piece, occurs idle bit or invalid byte of padding in the frame of avoiding carrying, thereby has saved limited bandwidth resources, has improved the performance of link transmission.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program is when carrying out, comprise the steps: to judge the information of the valid data length that whether has the indication carrying in the control domain in the Radio Link control/medium access control system RLC/MAC build, described valid data length is the length of the preceding input of coding data; When having the information of described valid data length in the control domain in the described RLC/MAC build,, carry out elongated chnnel coding according to the length of input data before the coding and the length of coding back dateout.

Claims (12)

1. the method for GSM packet domain encoding and decoding is characterized in that, may further comprise the steps:
Judge the information of the valid data length that whether has the indication carrying in the control domain in the Radio Link control/medium access control system RLC/MAC build, described valid data length is the length of the preceding input of coding data;
When having the information of described valid data length in the control domain in the described RLC/MAC build,, carry out elongated chnnel coding according to the length of input data before the coding and the length of coding back dateout.
2. method according to claim 1 is characterized in that, and is described according to the length of input data before the coding and the length of coding back dateout, carries out elongated chnnel coding and comprises:
According to the length of input data before the coding and the length of coding back dateout, select elongated channel coding rate;
According to the elongated channel coding rate of selecting, carry out elongated chnnel coding.
3. method according to claim 2, it is characterized in that the information of described valid data length comprises: be used for indicating the coding mode indication CMI and being used to of the self-adaption multi-speed encoding/decoding AMR pattern of described each frame of carrying data to indicate the frame number FN of the valid frame number of carrying.
4. whether method according to claim 1 is characterized in that, exist the information of the valid data length of indication carrying to comprise in the control domain in the described RLC/MAC of the judgement build:
Judge the information of the valid data length that whether has the indication carrying in the control domain in the RLC/MAC head by the temporary flow identity in the RLC/MAC build.
5. method according to claim 2 is characterized in that, described length according to input data before the coding carries out also comprising before the elongated chnnel coding with the length of coding back dateout:
Significant bits is carried out cyclic redundancy check (CRC).
6. according to each described method of claim 1 to 5, it is characterized in that, after described length according to the length of input data before encoding and the back dateout of encoding was carried out elongated chnnel coding, also comprise: the length according to dateout after the length of importing data before the described decoding and the decoding was carried out elongated channel-decoding.
7. according to each described method of claim 1 to 5, it is characterized in that described elongated chnnel coding is applied in the CS over GERAN business.
8. a GSM packet domain encoding device is characterized in that, comprising: judging unit and elongated chnnel coding unit;
Described judging unit is used for judging the information that whether has the valid data length of indication carrying in the control domain of Radio Link control/medium access control system RLC/MAC build, described valid data length for coding before the length of input data;
Described elongated chnnel coding unit, when being used for judged result when described judging unit and being having the information of described valid data length in the control domain of described RLC/MAC build, carry out elongated chnnel coding according to the length of input data before the coding and the length of coding back dateout.
9. equipment according to claim 8 is characterized in that, described elongated chnnel coding unit comprises first subelement and second subelement, wherein,
Described first subelement is used for selecting elongated channel coding rate according to the length of input data before the coding and the length of coding back dateout;
Described second subelement is used for carrying out elongated chnnel coding according to the elongated channel coding rate that described first subelement is selected.
10. equipment according to claim 9, it is characterized in that, described equipment also comprises verification unit, the length that is used for importing the length of data and encode the back dateout before described elongated chnnel coding unit is according to coding is carried out cyclic redundancy check (CRC) to significant bits before carrying out elongated chnnel coding.
11. according to Claim 8 to 10 each described equipment, it is characterized in that the information of described valid data length comprises that being used in reference to the coding mode that shows the Adaptive Multi-Rate codec pattern of each frame in the described carrying data indicates CMI and the frame number FN that is used in reference to the number of showing valid frame.
12. the system of GSM packet domain encoding and decoding is characterized in that, described system comprises as each described GSM packet domain encoding device of claim 8 to 11, also comprises receiving terminal;
Described receiving terminal is used for after the data that receive described GSM packet domain encoding device transmission, carries out elongated channel-decoding according to the length of input data before the described decoding and the length of decoding back dateout.
CN 200810182901 2008-12-05 2008-12-05 Method, equipment and system for encoding and decoding of GSM (global system for mobile communications) packet-switched domain Expired - Fee Related CN101753253B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN 200810182901 CN101753253B (en) 2008-12-05 2008-12-05 Method, equipment and system for encoding and decoding of GSM (global system for mobile communications) packet-switched domain
PCT/CN2009/075231 WO2010063231A1 (en) 2008-12-05 2009-12-01 Global system for mobile communications (gsm) packet switched domain coding method, device and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200810182901 CN101753253B (en) 2008-12-05 2008-12-05 Method, equipment and system for encoding and decoding of GSM (global system for mobile communications) packet-switched domain

Publications (2)

Publication Number Publication Date
CN101753253A true CN101753253A (en) 2010-06-23
CN101753253B CN101753253B (en) 2013-01-23

Family

ID=42232898

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200810182901 Expired - Fee Related CN101753253B (en) 2008-12-05 2008-12-05 Method, equipment and system for encoding and decoding of GSM (global system for mobile communications) packet-switched domain

Country Status (2)

Country Link
CN (1) CN101753253B (en)
WO (1) WO2010063231A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012126411A3 (en) * 2012-04-28 2013-04-11 华为技术有限公司 Digital subscriber line signal processing method, device and digital subscriber line system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101116277A (en) * 2005-02-07 2008-01-30 三星电子株式会社 Method for requesting and transmitting status report of a mobile communication system and therefor apparatus
WO2006083149A1 (en) * 2005-02-07 2006-08-10 Samsung Electronics Co., Ltd. Method and apparatus for requesting/transmitting status report of a mobile communication system
CN101282164B (en) * 2007-04-02 2012-12-26 华为技术有限公司 Method and apparatus for reducing delay time of wireless communication service

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012126411A3 (en) * 2012-04-28 2013-04-11 华为技术有限公司 Digital subscriber line signal processing method, device and digital subscriber line system

Also Published As

Publication number Publication date
CN101753253B (en) 2013-01-23
WO2010063231A1 (en) 2010-06-10

Similar Documents

Publication Publication Date Title
US10595305B2 (en) Method and apparatus for transmitting/receiving control information in a wireless communication system
CN1223134C (en) Methods and systems for decoding headers on radio channel
TWI459744B (en) Method and apparatus for conveying antenna configuration information via masking
CN108631789A (en) Coding, interpretation method and equipment
CN100373779C (en) Method for transmitting real-time data on radio packet communication network
CN1288870C (en) Method and system for transferring AMR signaling frames on half-rate channel
JP2003520493A (en) Processing method and apparatus for transmitting information symbols over a multiplexed channel and corresponding processing method and apparatus for reception
CN101483441A (en) Device for adding cyclic redundancy check in communication system
WO2006083132A1 (en) Apparatus and method for providing broadcast parameter message in a mobile communication system
JP4350371B2 (en) Transmission format detection method
CN101753253B (en) Method, equipment and system for encoding and decoding of GSM (global system for mobile communications) packet-switched domain
CN110266431B (en) Data transmission method and device
US8619901B2 (en) Systems and methods for providing unequal message protection
CN101222300A (en) Antenna amount transmission method
US7957492B2 (en) TFCI decoding apparatus and method
CN101330355A (en) Method for encoding and decoding channel as well as communication system and equipment
CN110838889A (en) Encoding method, decoding method, transmitting terminal and receiving terminal
CN103532659B (en) A kind of method and device for determining encoding scheme code book
CN110622529A (en) Communication method of broadcast channel
KR101490608B1 (en) Method and apparatus for transmitting/receiving contorl information in a wireless communication system
CN106576298A (en) Data transmission method and related communication device therefor
CN101232353A (en) Method for indicating HS-PDSCH channel modulation mode

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130123