CN101136722B - Data transmitting method and transmitting equipment suitable for high speed mobile terminal - Google Patents
Data transmitting method and transmitting equipment suitable for high speed mobile terminal Download PDFInfo
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Abstract
Dividing up original data packet (DP) into multiple small data packets (SDPs) with same or different lengths in order to transmit info in different priority levels, the sending end adds serial number and cyclic redundancy check (CRC) code for each SDP, and carries out permutation and combination for processed SDPs according to appointed order. Modulating the received signal to obtain DP, the receiving end carried out error corrected decoding DP so as to obtain decoded DP. Extracting SDP with pointed length from pointed position of the decoded DP, the method carries out CRC for each SDP. The invention can reduce average number of retransmission repeated request automatically, raise effective throughput, shorten transmission delay, and reduce ratio of losing packets. In each time of transmission repeated request automatically, the invention uses different sequence to permute, combine, encode, modulate, and send SDPs. Retransmission obtains diversity gain in time or frequency.
Description
Technical field
The present invention relates to a kind of data transmission method for uplink and transmission equipment that is applicable to high speed mobile terminal, relate to field of data transmission in the communication system.
Background technology
Utilize wireless channel to send packet, when duration of a frame data bag much smaller than coherence time of channel, the channel fading that a frame data bag is experienced is constant basically.When moving velocity of terminal improves gradually, shorten the coherence time of channel, the duration of one frame data bag is in the time of can not satisfying much smaller than the condition of channel coherence time, experienced different channel fadings in the one frame data bag, thereby cause the difficulty of channel estimation/equalization to strengthen, the probability of the packet mistake of being introduced by channel estimating/channel equalization error rises.
The transmission method of packet mainly contains following two kinds at present:
1) method 1, as shown in Figure 1, inserts pilot tone in the packet original position, is used for the channel estimating and the channel equalization of a frame data bag;
The advantage of this method is: pilot-frequency expense is little, and channel estimation methods is simple, the processing time is short;
The shortcoming of this method is: the translational speed that is only applicable to terminal is lower, and length of data package is shorter, and the duration of a frame data bag is much smaller than the channel situation of coherence time.Adopt this method, when long or moving velocity of terminal is higher when data packet length, the probability of packet mistake (BLER, Block Error Rate) will significantly increase.
2) method 2, as shown in Figure 2, in a plurality of ad-hoc locations insertion pilot tones of packet, are used for the channel estimating and the channel equalization of a frame data bag;
The advantage of this method is: it is higher to go for moving velocity of terminal, the situation that data packet length is long, the i.e. situation of frame data bag experience different channels decline.Prerequisite is that the coherence time of channel will be much larger than the time interval of inserting pilot tone.
The shortcoming of this method is: along with the channel shortening of coherence time, the aggravation of channel variation need be inserted pilot tone with the shorter time interval.Pilot-frequency expense is big, the method complexity of channel estimation/equalization, and the processing time is longer.
No matter adopt any method, the aggravation of channel variation all will cause the error of channel estimating/channel equalization to strengthen, thereby cause the increase of BLER.In other words, along with the raising of moving velocity of terminal, BLER also increases thereupon.
For reducing the probability (BLLR that causes data-bag lost by the data packet transmission mistake, Block LostRate), a kind of common way is to introduce the mistake retransmission mechanism, adopts mixed automatic repeat request (HARQ, hybrid automatic retransmission request) usually.HARQ is a kind of link adaptation techniques, and forward error correction coding (FEC, Forward Error Correction) and automatic repetitive requests (ARQ, automatic retransmission request) are combined.The check bit that contains error correction and error detection in the packet.The recipient carries out error-correcting decoding to packet earlier, as folding coding, Turbo decoding, again cyclic redundancy check (CRC) (CRC is carried out in the output of error-correcting decoding, Cyclic Redundancy Check), if by CRC check then show correct reception packet, receiving terminal sends affirmative acknowledgement information (ACK, acknowledgement), if not by CRC check then show that transmission error has exceeded the error correcting capability of FEC, can't correctly receive packet, receiving terminal transmission negative response information (NAK, non-acknowledgement).Transmitting terminal is according to response message retransmission data bag or send new packet.The advantage of this method is: can reduce the probability of packet loss, channel self-adapting ability is to a certain degree arranged.When channel condition was good, BLER was low, and average repeat time is few, active data transmission rate height, actual code rate height.During the channel condition variation, BLER raises, and average repeat time strengthens, and the active data transmission rate reduces, and actual code rate reduces.Promptly adjust transmission rate and code rate according to channel condition.
The shortcoming of this method is: need introduce acknowledgement mechanism at backward channel, increase the complexity of system and taken certain system bandwidth.
Summary of the invention
In order to remedy the deficiencies in the prior art, the present invention is directed to the transfer of data in the wireless communication system, a kind of data transmission method and transmission equipment that is applicable to high speed mobile terminal proposed.
For achieving the above object, a kind of data transmission method of high speed mobile terminal that is applicable to comprises data transmission method for uplink and data receive method.
A kind of data transmission method for uplink that is applicable to high speed mobile terminal, transmitting terminal may further comprise the steps:
Transmitting terminal is divided into a plurality of small data packets with raw data packets;
Transmitting terminal adds the bag sequence number for each packet;
Transmitting terminal increases cyclic redundancy check bits for each packet;
Transmitting terminal is arranged small data packets by particular order, be combined into a packet;
Transmitting terminal carries out error correction coding to generating packet;
Transmitting terminal is modulated and is sent the packet after encoding.
A kind of data receive method that is applicable to high speed mobile terminal, receiving terminal may further comprise the steps:
Receiving terminal carries out demodulation to received signal, obtains packet;
Receiving terminal carries out error-correcting decoding to packet;
Receiving terminal extracts small data packets by particular order and length from the packet after the decoding;
Receiving terminal carries out cyclic redundancy check (CRC) to each small data packets;
When receiving new data packets, if arbitrary small data packets is not passed through cyclic redundancy check (CRC), receiving terminal sends negative response;
When receiving retransmission data packet may, in conjunction with the preceding result of transmitting cyclic redundancy check (CRC) several times, if still have small data packets correctly not receive, transmitting terminal sends negative response information;
When receiving retransmission data packet may, in conjunction with the preceding result of transmitting cyclic redundancy check (CRC) several times, if all small data packets all correctly receive, receiving terminal sends affirmative acknowledgement information;
Small data packets ordering, combination that receiving terminal will correctly receive according to the bag sequence number.
A kind of data transmission set that is applicable to high speed mobile terminal contains transmitting apparatus and receiving equipment; Transmitting apparatus comprises:
Length by appointment is divided into small data packets with packet, and the length of these small data packets can be identical or different packet dispenser;
Generate the bag sequence number maker of a unique bag sequence number for each small data packets;
Be the cyclic redundancy check (CRC) code of each small data packets generation designated length, the length of small data packets cyclic redundancy check (CRC) code can be identical or different cyclic redundancy check (CRC) code makers;
By named order the small data packets of having added bag sequence number and cyclic redundancy check (CRC) code is carried out permutation and combination, can adopt identical or different order small data packets to be carried out the packet permutation and combination device of permutation and combination at each transmission of automatic repetitive requests;
Packet is carried out the encoder of error correction coding;
Packet behind the coding is modulated to the modulator that carrier wave gets on;
Send the dispensing device of new data packets or retransmission data bag according to the content choice that receives response message;
Receiving equipment comprises:
Receive the receiving system of the spacing wireless signal of characteristic frequency;
Carry out the demodulator that demodulation obtains packet to received signal;
Packet is carried out decoded operation, the decoder of the packet after the output decoding;
From the packet after the decoding, extract the packet extraction element of small data packets by position of appointing with transmitting terminal and length;
The small data packets of extracting is carried out the cyclic redundancy checker of cyclic redundancy check (CRC);
According to the bag sequence number to the small data packets combination of sorting, the data packet sequencing composite set of output reception packet;
The cyclic redundancy check (CRC) result of comprehensive all small data packets produces the response message maker of response message.
The transmitting apparatus block diagram is seen Fig. 7, and the small data packets after the output of packet dispenser is cut apart is to wrapping the sequence number maker; The output of bag sequence number maker has been added the small data packets of bag sequence number to the CRC maker; The output of CRC maker has been added the small data packets of CRC check sign indicating number to the packet collating unit; Packet after the packet collating unit output ordering combination is to encoder; Packet behind the encoder output encoder is to modulator; Signal after the modulator output modulation is to dispensing device; Signal after dispensing device will be modulated sends.
The receiving equipment block diagram is seen Fig. 8, and receiving system outputs signal to demodulator; Demodulator dateout bag is to decoder; Packet after the decoder output decoding is to the packet extraction element; Packet extraction element output small data packets is to cyclic redundancy checker; The correct small data packets that receives of cyclic redundancy checker output is to the data packet sequencing composite set; The output of data packet sequencing composite set receives packet; The CRC check device is exported the CRC check result of small data packets simultaneously to the response message maker; Response message maker output response message.
Beneficial effect of the present invention;
Way commonly used is to add a cyclic redundancy check (CRC) code for whole packet, receiving terminal carries out cyclic redundancy check (CRC) after to the packet error-correcting decoding again, if certain 1 or several bit mistakes are arranged behind the error-correcting decoding, then can't pass through cyclic redundancy check (CRC), receiving terminal sends negative response information requirements transmitting terminal and retransmits whole packet.
The present invention is divided into a plurality of small data packets with a user's data bag, according to the cyclic redundancy check (CRC) code that the importance of the transmitted breath of each packet is added different length respectively, there are certain 1 or a few bit-errors bit to drop in some or several small data packets behind the error-correcting decoding.The small data packets that comprises error bit can not be passed through cyclic redundancy check (CRC), and all the other do not comprise the small data packets of error bit and can pass through cyclic redundancy check (CRC), and the recipient can extract information wherein.In conjunction with retransmitting, if all small data packets all receive once by correct at least, receiving terminal sends affirmative acknowledgement information, and according to of the small data packets ordering combination of bag sequence number to correct reception, can reduce the average repeat time of automatic repetitive requests like this, improve effective throughput, shortening propagation delay time, the reduction packet loss of system.The present invention encodes, modulates, sends after each transmission of repetitive requests is adopted in differing order to the small data packets permutation and combination automatically, by retransmitting the diversity gain that can obtain on time or the frequency.
Description of drawings
Fig. 1 is the transmission method schematic diagram that the packet head inserts pilot signal;
Fig. 2 is the transmission method schematic diagram that a plurality of ad-hoc locations of packet insert pilot signal;
Fig. 3 is the schematic diagram of packet dividing method;
Fig. 4 is the schematic diagram that small data packets is added the bag sequence number;
Fig. 5 is the schematic diagram that small data packets is added the CRC check sign indicating number;
Fig. 6 is the schematic diagram of transmitting terminal to the small data packets ordering;
Fig. 7 is the transmitting apparatus block diagram;
Fig. 8 is the receiving equipment block diagram;
Fig. 9 is that the packet of embodiment 1 is cut apart schematic diagram;
Figure 10 is the schematic diagram that embodiment 1 small data packets is added the bag sequence number;
Figure 11 is embodiment 1, and small data packets is added the schematic diagram of the CRC check sign indicating number of different length;
Figure 12 is embodiment 1, by the schematic diagram of particular order to small data packets arrangement, combination;
Figure 13 is embodiment 1, and receiving terminal extracts the schematic diagram of small data packets from the packet after the decoding;
Figure 14 is embodiment 1, small data packets CRC check result's schematic diagram in the transmission course;
Figure 15 is embodiment 2, and raw data packets is divided into the schematic diagram of the identical small data packets of length;
Figure 16 is embodiment 2, and small data packets is added the schematic diagram of bag sequence number;
Figure 17 is embodiment 2, and small data packets is added the schematic diagram of equal length CRC check sign indicating number;
Figure 18 is embodiment 2, by the schematic diagram of particular order to small data packets arrangement, combination;
Figure 19 is embodiment 2, and receiving terminal extracts the schematic diagram of small data packets from the packet after the decoding;
Figure 20 is embodiment 2, the CRC check result's of small data packets schematic diagram in the transmission course.
The present invention is further described below in conjunction with drawings and Examples.
Embodiment
The present invention is directed to the transfer of data in the wireless communication system, proposed a kind of data transmission method that is applicable to high speed mobile terminal.Transmitting terminal is divided into a plurality of little packets with packet, for each packet adds bag sequence number and CRC check sign indicating number.Packet after transmitting terminal will be handled sends by specific order, and each re-transmission is all adopted and sent small data packets in differing order, thus the diversity gain on acquisition time and the frequency.Receiving terminal extracts small data packets to after receiving packet and carrying out error-correcting decoding with named order and length, respectively each small data packets is carried out CRC check, if all correctly receptions then send ACK of all small data packets.
The present invention has provided following solution:
Transmitting terminal is divided into a plurality of little packets by length-specific with packet, for each small data packets is added bag sequence number and CRC check sign indicating number.By specific order (the each re-transmission adopted in differing order) permutation and combination, the packet input error correcting encoder with generating sends the packet modulation after encoding with the small data packets after all processing.
Receiving terminal carries out demodulation to received signal and obtains packet, and packet is carried out error-correcting decoding.From the packet after the decoding, extract small data packets by specific order and length, small data packets is carried out CRC check, if all correctly reception then send ACK of all small data packets, if would still have correctly reception then send NAK of small data packets.
Adopt such scheme, transmitting terminal is realized by following steps:
One. transmitting terminal is divided into small data packets with packet
Transmitting terminal is divided into a plurality of small data packets with raw data packets.The length of each small data packets all is that transmitting terminal and receiving terminal are appointed in advance, need not extra Signalling exchange.As shown in Figure 3, the dividing method of packet has following two kinds:
Method 1: the small data packets that raw data packets is divided into a plurality of equal in length.
Method 2: raw data packets is divided into the unequal small data packets of a plurality of length.
Can with important information, than important information with in less important information is divided in different small data packets, carry out subsequent treatment discriminatively.
Two. transmitting terminal adds the bag sequence number for each small data packets
As shown in Figure 4, transmitting terminal adds sequence number for each small data packets.Length, form and the position of bag sequence number all are that transmitting terminal and receiving terminal are appointed in advance, need not extra Signalling exchange.
Three. transmitting terminal adds the CRC check sign indicating number for each small data packets
As shown in Figure 5, transmitting terminal adds the CRC check sign indicating number for each small data packets, and the method for adding the CRC check sign indicating number has following two kinds:
Method 1: the CRC check sign indicating number that adds equal length for each small data packets
Method 2: the CRC check sign indicating number that adds different length for each small data packets
The length of the CRC check sign indicating number of each small data packets is that transmitting terminal and receiving terminal are appointed in advance, does not need extra Signalling exchange.Can add the long check code of length for the small data packets that comprises important information, for the small data packets that comprises less important information is added the short CRC check sign indicating number of length.
Four. transmitting terminal is arranged small data packets by particular order
As shown in Figure 6, transmitting terminal will add the small data packets of bag sequence number and CRC check sign indicating number by specific sequence arrangement, combination.Can adopt different putting in order when sending new data packets with the gain of diversity on acquisition time and the frequency with retransmission data packet may.It all is that transmitting terminal and receiver section are appointed in advance that the small data packets that is adopted when sending new data packets and each retransmission data packet may puts in order, and does not need extra Signalling exchange.
Five. transmitting terminal is to the data packet encoder
Transmitting terminal carries out error correction coding to the packet that ordering combination back generates.
Six. transmitting terminal is to modulation of encoder output bit flow and transmission
The packet that transmitting terminal is exported encoder is modulated on the carrier wave and sends.
Adopt such scheme, receiving terminal is realized by following steps:
One. the receiving terminal demodulated received signal
Receiving terminal carries out demodulation to received signal, obtains packet.
Two. receiving terminal is deciphered packet
Receiving terminal carries out error-correcting decoding to packet, the packet after obtaining deciphering.
Three. receiving terminal extracts small data packets
Receiving terminal extracts the small data packets of designated length from the assigned address of deciphering the back packet.
Four. receiving terminal carries out CRC check to small data packets
Receiving terminal carries out CRC check to each small data packets.
Five. receiving terminal produces response message
Receiving terminal produces response message according to the result of all small data packets CRC check.
When receiving new data packets, if any one small data packets is not passed through CRC check, receiving terminal produces NAK.
When receiving retransmission data packet may, in conjunction with the CRC check result of all transmission before this packet, if by retransmitting, all at least by CRC check once, receiving terminal produces ACK to all small data packets.
When receiving retransmission data packet may, in conjunction with the CRC check result of all transmission before this packet, if by retransmitting, still have small data packets never by CRC check, receiving terminal produces NAK.
Six. receiving terminal ordering combination small data packets
Receiving terminal according to the bag sequence number to the combination of sorting of the small data packets of correct reception.
The present invention has provided the transmitting apparatus that is applicable to high speed mobile terminal.As shown in Figure 7, this equipment is made up of the following function module:
Packet dispenser, bag sequence number maker, CRC maker, packet permutation and combination device, encoder, modulator, dispensing device.Wherein:
The packet dispenser is divided into small data packets by the length of appointing with receiving terminal with packet, the length of these small data packets can be identical also can be different.
Bag sequence number maker is for each small data packets generates a unique bag sequence number.
The CRC maker is that each small data packets generates the CRC check sign indicating number by the length of appointing with receiving terminal, the length of small data packets CRC check sign indicating number can be identical also can be different.
Packet permutation and combination device carries out permutation and combination by the order of appointing with receiving terminal to the small data packets of having added bag sequence number and CRC check sign indicating number, output " generation packet ".Automatically each transmission of repetitive requests can adopt identical or different order to the small data packets combination of sorting;
Encoder carries out error correction coding, the packet behind the output encoder to " generation packet ";
Modulator is modulated to carrier wave with the packet behind the coding and gets on;
Dispensing device sends new data packets or retransmission data bag according to the content choice that receives response message.
The present invention has provided the receiving equipment that is applicable to high speed mobile terminal.As shown in Figure 8, this equipment is made up of the following function module:
Receiving system, demodulator, decoder, packet extraction element, CRC check device, data sorting composite set, response message maker.Wherein:
Receiving system, the spacing wireless signal of reception characteristic frequency;
Demodulator carries out demodulation to received signal and obtains packet;
Decoder carries out decoded operation to packet, the packet after the output decoding;
The packet extraction element extracts small data packets by position of appointing with transmitting terminal and length from the packet after the decoding;
The CRC check device carries out CRC check to the small data packets of extracting;
The data packet sequencing composite set, according to the bag sequence number to the small data packets combination of sorting, output reception packet;
The response message generating apparatus, comprehensively the CRC check result of all small data packets produces response message.
Transmitting terminal:
As shown in Figure 9, the length of raw data packets is 200Byte, and transmitting terminal is divided into 3 small data packets that are uneven in length with packet:
Length is the small data packets of 40Byte, the important information of storage highest ranking;
Length is the small data packets of 60byte, stores high-grade routine information;
Length is the small data packets of 100byte, stores low-grade routine information.
As shown in figure 10, add the bag sequence number for each small data packets:
Length is that the small data packets of 40Byte is added bag sequence number 01;
Length is that the small data packets of 60Byte is added bag sequence number 10;
Length is that the small data packets of 100Byte is added bag sequence number 11;
According to the number of small data packets, transmitting terminal and receiving terminal are appointed the length of bag sequence number in advance.
As shown in figure 11, add the CRC check sign indicating number for each small data packets:
Packet 2 adds the CRC check sign indicating number of 32 bits;
Packet 3 adds the CRC check sign indicating number of 16 bits.
As shown in figure 12, transmitting terminal is arranged small data packets, make up by particular order:
The maximum transmission times of mixed automatic repeat request equals 3,
During the transmission new data packets, small data packets is arranged, made up by particular order 1;
During a retransmission data packet may, small data packets is arranged, made up by particular order 2;
During the secondary retransmission data packet may, small data packets is arranged, made up by particular order 3.
The data packet coding that transmitting terminal generates permutation and combination, modulation back send.
Receiving terminal:
Receive the wireless signal of assigned frequency, and carry out demodulation acquisition packet to received signal;
Receiving terminal carries out packet after error-correcting decoding obtains decoding to packet;
As shown in figure 13, when receiving new data packets, decipher the 1st 354 bits (40Byte data, 2 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) of back packet certainly than the extraction packet 1 that rises abruptly; The 355th 514 bits (60byte data, 2 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 2 that rises abruptly; The 869th 818 bits (100byte data, 2 bit bag sequence numbers, 16 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 3 that rises abruptly.
When receiving the packet that once retransmits, the 1st 514 bits (60byte data from decoding back packet than the extraction packet 2 that rises abruptly, 2 bit bag sequence numbers, 32 bit CRC check sign indicating numbers), decipher the 515th 818 bits (100byte data, 2 bit bag sequence numbers of back packet certainly than the extraction packet 3 that rises abruptly, 16 bit CRC check sign indicating numbers), get the 1333rd 354 bits (40byte data, 2 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 1 that rises abruptly.
When receiving the packet of secondary re-transmission, decipher the 1st 818 bits (100byte data, 2 bit bag sequence numbers, 16 bit CRC check sign indicating numbers) of back packet certainly than the extraction packet 3 that rises abruptly; The 819th 354 bits (40byte data, 2 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 1 that rises abruptly; The 1173rd 514 bits (60byte data, 2 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 2 that rises abruptly.
The transmission course of some packets is as shown in figure 14:
During initial transmission, small data packets 2 is by CRC check, and receiving terminal produces negative response information;
When retransmitting for the first time, small data packets 3 so far still has small data packets 1 never by CRC check by CRC check, and receiving terminal produces negative response information.
When retransmitting for the second time, small data packets 3,1 is by CRC check, and so far all small data packets all have at least once by CRC check, and receiving terminal produces affirmative acknowledgement information.
The small data packets that receiving terminal will correctly receive is according to bag sequence number ordering combination.
Embodiment 2
Transmitting terminal:
As shown in figure 15, the initial data packet length is 400Byte, and transmitting terminal is divided into 4 small data packets that length is identical with packet, transmits the important information of highest ranking, high-grade important information and low-grade routine information respectively.
As shown in figure 16, add the bag sequence number of 4 bits for each small data packets;
As shown in figure 17, add the CRC check sign indicating number of 32 bits for each small data packets;
As shown in figure 18, transmitting terminal is arranged small data packets, make up by particular order:
The maximum transmission times of mixed automatic repeat request equals 4,
During the transmission new data packets, small data packets is arranged, made up by particular order 1;
During a retransmission data packet may, small data packets is arranged, made up by particular order 2;
During the secondary retransmission data packet may, small data packets is arranged, made up by particular order 3;
During three retransmission data packet may, small data packets is arranged, made up by particular order 4.
Receiving terminal:
Receive the wireless signal of assigned frequency, and carry out demodulation acquisition packet to received signal;
Receiving terminal carries out packet after error-correcting decoding obtains decoding to packet;
As shown in figure 19, when receiving new data packets, decipher the 1st 836 bits (100Byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) of back packet certainly than the extraction packet 1 that rises abruptly; The 837th 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 2 that rises abruptly; The 1673rd 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 3 that rises abruptly; The 2509th 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 4 that rises abruptly.
When receiving the packet that once retransmits, decipher the 1st 836 bits (100Byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) of back packet certainly than the extraction packet 2 that rises abruptly; The 837th 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 3 that rises abruptly; The 1673rd 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 4 that rises abruptly; The 2509th 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 1 that rises abruptly.
When receiving the packet of secondary re-transmission, decipher the 1st 836 bits (100Byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) of back packet certainly than the extraction packet 3 that rises abruptly; The 837th 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 4 that rises abruptly; The 1673rd 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 1 that rises abruptly; The 2509th 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 2 that rises abruptly.
When receiving the packet of three re-transmissions, decipher the 1st 836 bits (100Byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) of back packet certainly than the extraction packet 4 that rises abruptly; The 837th 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 1 that rises abruptly; The 1673rd 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 2 that rises abruptly; The 2509th 836 bits (100byte data, 4 bit bag sequence numbers, 32 bit CRC check sign indicating numbers) from decoding back packet than the extraction packet 3 that rises abruptly.
The transmission course of some packets is as shown in figure 20:
During initial transmission, small data packets 1,3 is by CRC check, and receiving terminal produces negative response information;
When retransmitting for the first time, small data packets 1,2 so far still has small data packets 4 never by CRC check by CRC check, and receiving terminal produces negative response information.
When retransmitting for the second time, small data packets 1,4 is by CRC check, and so far all small data packets all have at least once by CRC check, and receiving terminal produces affirmative acknowledgement information.
The small data packets that receiving terminal will correctly receive is according to bag sequence number ordering combination.
Claims (10)
1. a data transmission method that is applicable to high speed mobile terminal comprises data transmission method for uplink and data receive method, it is characterized in that:
Data transmission method for uplink comprises that step has:
1) transmitting terminal is divided into a plurality of small data packets with raw data packets;
2) transmitting terminal adds the bag sequence number for each small data packets;
3) transmitting terminal adds cyclic redundancy check (CRC) code for each small data packets;
4) transmitting terminal carries out permutation and combination by named order to small data packets;
5) packet that generates after to permutation and combination of transmitting terminal carries out error correction coding;
6) the packet modulation after transmitting terminal will be encoded, transmission;
Data receive method comprises that step has:
1) receiving terminal receives wireless signal, and carries out demodulation to received signal and obtain packet;
2) receiving terminal carries out error-correcting decoding to packet, the packet after obtaining deciphering;
3) receiving terminal extracts small data packets from the packet after the decoding;
4) receiving terminal carries out cyclic redundancy check (CRC) to each small data packets;
5) receiving terminal generates response message according to the result of all small data packets cyclic redundancy check (CRC);
6) receiving terminal according to the bag sequence number to the combination of sorting of the small data packets of correct reception.
2. by the described method of claim 1, it is characterized in that: transmitting terminal is divided into a plurality of small data packets with raw data packets, the length of these small data packets can be identical also can be different, and the bag sequence number of each small data packets is unique.
3. by the described method of claim 1, it is characterized in that also comprising: transmitting terminal is each small data packets interpolation cyclic redundancy check (CRC) code, the length of the cyclic redundancy check (CRC) code of each small data packets can be identical also can be different.
4. by the described method of claim 1, it is characterized in that also comprising: transmit transmitting terminal at every turn and adopt named order that small data packets is arranged, made up.
5. by the described method of claim 1, it is characterized in that also comprising: the each transmission of transmitting terminal can be carried out permutation and combination to small data packets according to identical order or different orders.
6. by the described method of claim 1, it is characterized in that: receiving terminal extracts the small data packets of designated length by specified order from the assigned address of deciphering the back packet.
7. by the described method of claim 1, it is characterized in that also comprising: the each transmission of receiving terminal can be extracted the small data packets of designated length according to the assigned address of identical order or the different order packet after the decoding.
8. by the described method of claim 1, it is characterized in that also comprising: when receiving new data packets, if small data packets is arranged not by cyclic redundancy check (CRC), receiving terminal produces negative response information; Or when receiving retransmission data packet may, in conjunction with the cyclic redundancy check (CRC) result of all transmission before this packet, if all small data packets all correctly receive, receiving terminal produces affirmative acknowledgement information.
9. by the described a kind of data transmission method that is applicable to high speed mobile terminal of claim 1, it is characterized in that also comprising: when receiving retransmission data packet may, cyclic redundancy check (CRC) result in conjunction with the small data packets of all transmission before this packet, if still have small data packets never correctly to receive, receiving terminal produces negative response information.
10. a data transmission set that is applicable to high speed mobile terminal contains transmitting apparatus and receiving equipment; It is characterized in that transmitting apparatus comprises:
Length by appointment is divided into small data packets with packet, and the length of these small data packets can be identical or different packet dispenser;
Generate the bag sequence number maker of a unique bag sequence number for each small data packets;
Be the cyclic redundancy check (CRC) code of each small data packets generation designated length, the length of small data packets cyclic redundancy check (CRC) code can be identical or different cyclic redundancy check (CRC) code makers;
By named order the small data packets of having added bag sequence number and cyclic redundancy check (CRC) code is carried out permutation and combination, can adopt identical or different order small data packets to be carried out the packet permutation and combination device of permutation and combination at each transmission of automatic repetitive requests;
Packet is carried out the encoder of error correction coding;
Packet behind the coding is modulated to the modulator that carrier wave gets on;
Send the dispensing device of new data packets or retransmission data bag according to the content choice that receives response message;
Receiving equipment comprises:
Receive the receiving system of the spacing wireless signal of characteristic frequency;
Carry out the demodulator that demodulation obtains packet to received signal;
Packet is carried out decoded operation, the decoder of the packet after the output decoding;
From the packet after the decoding, extract the packet extraction element of small data packets by position of appointing with transmitting terminal and length;
The small data packets of extracting is carried out the cyclic redundancy checker of cyclic redundancy check (CRC);
According to the bag sequence number to the small data packets combination of sorting, the data packet sequencing composite set of output reception packet;
The cyclic redundancy check (CRC) result of comprehensive all small data packets produces the response message maker of response message;
Small data packets after the output of packet dispenser is cut apart is to wrapping the sequence number maker; The output of bag sequence number maker has been added the small data packets of bag sequence number to the CRC maker; The output of CRC maker has been added the small data packets of CRC check sign indicating number to packet permutation and combination device; Packet after the packet permutation and combination device output permutation and combination is to encoder; Packet behind the encoder output encoder is to modulator; Signal after the modulator output modulation is to dispensing device; Signal after dispensing device will be modulated sends;
Receiving system outputs signal to demodulator; Demodulator dateout bag is to decoder; Packet after the decoder output decoding is to the packet extraction element; Packet extraction element output small data packets is to cyclic redundancy checker; The correct small data packets that receives of cyclic redundancy checker output is to the data packet sequencing composite set; The output of data packet sequencing composite set receives packet; The CRC check device is exported the CRC check result of small data packets simultaneously to the response message maker; Response message maker output response message.
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