CN101547076A - Method for descending order and modulating in orthogonal frequency division multiple access system - Google Patents
Method for descending order and modulating in orthogonal frequency division multiple access system Download PDFInfo
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- CN101547076A CN101547076A CN200810088007A CN200810088007A CN101547076A CN 101547076 A CN101547076 A CN 101547076A CN 200810088007 A CN200810088007 A CN 200810088007A CN 200810088007 A CN200810088007 A CN 200810088007A CN 101547076 A CN101547076 A CN 101547076A
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Abstract
The invention discloses a method for descending order and modulating in an orthogonal frequency division multiple access system, which comprises the following steps that: when a base station receives data transmission application of an access terminal, the base station determines a modulation mode of a data packet according to the data transmission application; the base station uses the determined modulation mode to modulate the data packet and sends the modulated data packet to the access terminal; when the access terminal cannot demodulate the data packet, negative acknowledgement NAK is sent to the base station; and after the base station receives the NAK of the access terminal, under the condition that the retransmission time does not exceed the maximal retransmission time, the base station adjusts the modulation mode of the data packet, uses the redetermined modulation mode to modulate the data packet and sends the modulated data packet to the access terminal. The method can reduce the probability of unsuccessful transmission of the data packet and increase the reliability of data transmission.
Description
Technical field
The present invention relates to a kind of mobile communication technology, relate in particular to the method for the depression of order modulation in a kind of OFDMA (OrthogonalFrequency Division Multiple Access, OFDM inserts) system.
Background technology
In wireless telecommunication system, packet just is sent to rf modulations after need passing through processing such as error correction coding, sequence repetition, baseband modulation usually.The purpose of baseband modulation is to improve performance, and improves the availability of frequency spectrum.The mode of baseband modulation comprises and generally includes QPSK, 8-PSK, 16-QAM and 64-QAM, more than the order of modulation of several modulation systems raise successively, performance is also become better and better, the availability of frequency spectrum is also more and more higher.But for receiving terminal, the modulation system of high-order needs higher signal to noise ratio could correctly demodulate signal.
In wireless telecommunication system,, adopt HARQ (Hybrid Automatic Repeat Request, mixed automatic repeat request) technology usually in order to improve reliability of data transmission.The base station is divided into a plurality of son bags with packet through the modulation symbol that produces after the baseband modulation, and the number of son bag is identical with the HARQ the number of transmissions.Transmission earlier first son bag in base station accessed terminal, and can't demodulate packet from first son bag if access terminal, and then sends a NAK (Negative Acknowledgement) to the base station, and second son bag will be continued to send in the base station.Repeat said process, all be sent completely up to all son bags.If before all son bag transmissions finished, accessing terminal had just demodulated packet, then access terminal to send an ACK (affirmation) to the base station, the base station stops to send the remaining son bag of this packet, the child bag transmission of beginning new data packets.This situation is called " premature termination ", and " premature termination " is equivalent to and improved message transmission rate.If after all son bags all sent and finish, that receive the base station was NAK entirely, represent that then this packet transmits failure.
In the above-mentioned HARQ mode, after if first son bag sends, access terminal and to demodulate packet, because the order of modulation of follow-up son bag is identical with the order of modulation of first son bag, then follow-up sub-bag can't be access in the probability that the terminal demodulation comes out can be very big, thereby cause whole packet to transmit failure.
Summary of the invention
Technical problem solved by the invention provides the method for descending order and modulating in a kind of orthogonal frequency division multiple access system, can reduce packet and transmit failed probability, increases reliability of data transmission.
Technical scheme is as follows:
Method for descending order and modulating in a kind of orthogonal frequency division multiple access system, step comprises:
(1) after the base station receives the data transmission request that accesses terminal, according to the modulation system of described data transmission request specified data bag; The base station modulation system modulating data bag of determining, and the packet after will modulating sends to described accessing terminal;
(2) can't demodulate packet when accessing terminal, send negative acknowledgement NAK to the base station;
(3) after the NAK that accesses terminal is received in the base station, when number of retransmissions does not surpass under the situation of described maximum retransmission, the modulation system of packet is adjusted in described base station, and with the modulation system modulating data bag that redefines, and the packet after will modulating sends to described accessing terminal.
Further, in the step (1), the modulation system and the maximum retransmission of current data packet determined in described base station according to the described data rate size that accesses terminal application.
Further, in the step (2),, send affirmation ACK to the base station if described accessing terminal correctly demodulates packet; At this moment, in the step (3), after described affirmation ACK was received in described base station, current data packet sent successfully, and described base station enters the transmission of next packet.
Further, in the step (3), during the modulation system of the packet that described base station redefines, its order of modulation is not more than the last order of modulation of determining.
Further, described modulation system comprises: QPSK, 8-PSK, 16-QAM or 64-QAM.
Technical solution of the present invention has reduced packet and has transmitted failed probability, has increased reliability of data transmission.
Description of drawings
Fig. 1 is for sending the flow chart of a packet in the OFDMA of the present invention system.
Embodiment
Core concept of the present invention is progressively to reduce the order of modulation of retransmission data packet may, may further comprise the steps:
1, the modulation system of base station specified data bag and maximum retransmission;
The modulation system that the data rate size that the base station can be applied for according to accessing terminal is come the specified data bag, simultaneously, the maximum retransmission of HARQ also can and access terminal by the base station and make an appointment.
2, the base station modulation system modulating data bag of determining, and the packet after will modulating sends to and accesses terminal;
If 3, the NAK that accesses terminal is received in the base station, under the situation of the maximum retransmission that does not surpass HARQ, the base station redefines the modulation system of packet, changes step 2; Otherwise, begin next packet and send.During the modulation system of the packet that the base station redefines, its order of modulation is not more than the last order of modulation of determining.
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1, be the flow chart that sends a packet in the OFDMA of the present invention system, in this example, the maximum retransmission of HARQ is 6 times.
Step S101, accessing terminal sends data transmission request to the base station;
Step S102, the base station receives this data transmission request, and the base station determines to adopt the 64-QAM modulation system to come packet is modulated according to the application that accesses terminal, and the packet after will modulating then sends to and accesses terminal;
Step S103 can't demodulate packet if access terminal, and sends NAK to the base station;
Step S104 after NAK is received in the base station, redefines the modulation system of packet, and order of modulation is adjusted into 16-QAM, and packet is modulated the back again sends to for the second time and access terminal;
Step S105 also can't demodulate packet if access terminal, and then sends NAK to the base station;
Step S106, after NAK was received in the base station, the modulation system that redefines packet was 16-QAM, and sent to for the third time after packet modulated again and access terminal;
Step S107 also can't demodulate packet if access terminal, and then sends NAK to the base station;
Step S108, after NAK was received in the base station, the modulation system that redefines packet was 8-PSK, and packet is modulated the back again sent to for the 4th time and to access terminal;
Step S109, accessing terminal correctly demodulates packet, sends ACK to the base station, and the base station receives that the notebook data bag sends successfully, and the transmission flow of current data packet finishes, and the base station enters the transmission of next packet.
If the ACK that accesses terminal was not still received in the base station when number of retransmissions of base station reached maximum retransmission, the transmission of packet failure this time, the base station enters the transmission of next packet.
Claims (5)
1, the method for descending order and modulating in a kind of orthogonal frequency division multiple access system, step comprises:
(1) after the base station receives the data transmission request that accesses terminal, according to the modulation system of described data transmission request specified data bag; The base station modulation system modulating data bag of determining, and the packet after will modulating sends to described accessing terminal;
(2) can't demodulate packet when accessing terminal, send negative acknowledgement NAK to the base station;
(3) after the NAK that accesses terminal is received in the base station, when number of retransmissions does not surpass under the situation of described maximum retransmission, the modulation system of packet is adjusted in described base station, and with the modulation system modulating data bag that redefines, and the packet after will modulating sends to described accessing terminal.
2, the method for claim 1 is characterized in that, in the step (1), the modulation system and the maximum retransmission of current data packet determined in described base station according to the described data rate size that accesses terminal application.
3, the method for claim 1 is characterized in that, in the step (2), if described accessing terminal correctly demodulates packet, sends affirmation ACK to the base station; At this moment, in the step (3), after described affirmation ACK was received in described base station, current data packet sent successfully, and described base station enters the transmission of next packet.
4, the method for claim 1 is characterized in that, in the step (3), during the modulation system of the packet that described base station redefines, its order of modulation is not more than the last order of modulation of determining.
5, the method for claim 1 is characterized in that, described modulation system comprises: QPSK, 8-PSK, 16-QAM or 64-QAM.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810088007A CN101547076A (en) | 2008-03-24 | 2008-03-24 | Method for descending order and modulating in orthogonal frequency division multiple access system |
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| CN200810088007A CN101547076A (en) | 2008-03-24 | 2008-03-24 | Method for descending order and modulating in orthogonal frequency division multiple access system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106685587A (en) * | 2015-11-06 | 2017-05-17 | 株式会社Kt | Method of determining modulation order and transport block size in downlink data channel, and apparatus thereof |
| CN108521853A (en) * | 2017-07-31 | 2018-09-11 | 深圳市大疆创新科技有限公司 | A kind of method for transmission processing of data packet, device and communication equipment |
| CN113890679A (en) * | 2021-09-26 | 2022-01-04 | 中国联合网络通信集团有限公司 | Signal modulation method, signal modulation device, electronic equipment and computer readable storage medium |
| WO2022257026A1 (en) * | 2021-06-08 | 2022-12-15 | 华为技术有限公司 | Communication method and communication apparatus |
-
2008
- 2008-03-24 CN CN200810088007A patent/CN101547076A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106685587A (en) * | 2015-11-06 | 2017-05-17 | 株式会社Kt | Method of determining modulation order and transport block size in downlink data channel, and apparatus thereof |
| CN106685587B (en) * | 2015-11-06 | 2020-12-08 | 株式会社Kt | Method and device for determining modulation order and transmission block size in downlink data channel |
| US11497016B2 (en) | 2015-11-06 | 2022-11-08 | Kt Corporation | Method of determining modulation order and transport block size in downlink data channel, and apparatus thereof |
| CN108521853A (en) * | 2017-07-31 | 2018-09-11 | 深圳市大疆创新科技有限公司 | A kind of method for transmission processing of data packet, device and communication equipment |
| WO2019023903A1 (en) * | 2017-07-31 | 2019-02-07 | 深圳市大疆创新科技有限公司 | Method and device for transmitting and processing data packet, and communication device |
| CN108521853B (en) * | 2017-07-31 | 2020-11-20 | 深圳市大疆创新科技有限公司 | Data packet transmission processing method and device and communication equipment |
| US11159267B2 (en) | 2017-07-31 | 2021-10-26 | SZ DJI Technology Co., Ltd. | Method and device for transmitting and processing data packet, and communication device |
| WO2022257026A1 (en) * | 2021-06-08 | 2022-12-15 | 华为技术有限公司 | Communication method and communication apparatus |
| CN113890679A (en) * | 2021-09-26 | 2022-01-04 | 中国联合网络通信集团有限公司 | Signal modulation method, signal modulation device, electronic equipment and computer readable storage medium |
| CN113890679B (en) * | 2021-09-26 | 2023-08-22 | 中国联合网络通信集团有限公司 | Signal modulation method, signal modulation device, electronic equipment and computer readable storage medium |
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Open date: 20090930 |