WO2012065544A1 - Procédé et dispositif adaptatifs pour système mimo en liaison montante - Google Patents

Procédé et dispositif adaptatifs pour système mimo en liaison montante Download PDF

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Publication number
WO2012065544A1
WO2012065544A1 PCT/CN2011/082235 CN2011082235W WO2012065544A1 WO 2012065544 A1 WO2012065544 A1 WO 2012065544A1 CN 2011082235 W CN2011082235 W CN 2011082235W WO 2012065544 A1 WO2012065544 A1 WO 2012065544A1
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Prior art keywords
mode
uplink data
total
transmission mode
period
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PCT/CN2011/082235
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English (en)
Chinese (zh)
Inventor
赖世明
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中兴通讯股份有限公司
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Publication of WO2012065544A1 publication Critical patent/WO2012065544A1/fr

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    • 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
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • 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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/203—Details of error rate determination, e.g. BER, FER or WER

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an uplink MIMO (Multiple Input Multiple-Output) adaptive method and apparatus.
  • uplink MIMO Multiple Input Multiple-Output
  • MIMO is one of the key technologies of the physical layer in the OFDMA (Orthogonal Frequency Division Multiple Access) system.
  • the signal source S(k) is transmitted by the multi-antenna antenna after time-space coding, and then passes through the wireless channel, and is received by the multi-antenna antenna at the receiving end, and the original signal is recovered after the spatio-temporal decoding at the receiving end.
  • the central idea of MIMO is to use multiple antennas to suppress channel fading.
  • the implementation method is to optimize the multipath antenna channel as a whole by transmitting and receiving, so as to achieve high communication capacity and spectrum utilization, which is a near-optimal. Spatial domain time domain joint diversity and interference cancellation processing.
  • STC Space Time Coding
  • SM Space Multiplexing
  • the SM technology takes advantage of the space.
  • the sender sends two characters at the same time in one character time, and sends another two characters in the next character time, as shown in Figure 2.
  • the high-speed data stream is divided into parallel data streams for simultaneous transmission. At this time, the transmission data of each antenna is different.
  • spatial demodulation multiplexing is performed and recombined into a high-speed serial data stream.
  • Uplink virtual MIMO when the terminal uses only one transmit antenna, MIMO can only be implemented by multiple terminal cooperation, that is, Virtual MIMO technology, as shown in Figure 3.
  • Virtual MIMO each terminal uses one transmit antenna and uses the same time-frequency resources.
  • the data of each terminal is encoded, interleaved, modulated, mapped, and modulated after the same data as the non-MIMO mode.
  • the carriers are coded in pairs according to the protocol and then sent to the base station.
  • the method in which two terminals cooperate to implement uplink Virtual MIMO is also called pairing mode.
  • Adaptive pairing refers to adaptively selecting appropriate terminals for pairing according to a certain method. After successful pairing, if channel conditions are deteriorated and transmission is unstable, then Adaptive split processing.
  • the present invention provides an uplink MIMO adaptive method and apparatus for solving resources in a utilization system that cannot be optimized by using any non-MIMO mode or MIMO mode in the prior art, and providing flexible data for users.
  • the problem with the transmission method is that
  • An embodiment of the present invention provides an uplink MIMO adaptive method, including:
  • the current uplink data transmission mode is one of a non-multiple input multiple output MIMO mode, a virtual MIMO mode, a space time coding STC mode, or a spatial multiplexing SM mode;
  • the uplink transmission is performed according to the error packet rate P and the total number of packets N_Total.
  • the determining, according to the determined current transmission mode, when the current time period reaches the preset transmission mode switching period, selecting the optimal transmission mode according to the error packet rate P and the total number of packets N-Total for uplink data transmission include:
  • the current uplink data transmission mode is non-MIMO mode, it is detected whether the current time period reaches a preset first transmission mode switching period, and if yes, according to the packet error rate P, the total number of packets N_Total, and the uplink.
  • the congestion coefficient switches the transmission mode of the uplink data to the virtual MIMO mode or the STC mode;
  • the current uplink data transmission mode is the virtual MIMO mode
  • the current uplink data transmission mode is STC mode, it is detected whether the current time period reaches the preset third transmission mode switching period, and if so, according to the packet error rate in the period?
  • the total number of packets N-Total and channel correlation switch the transmission mode of the uplink data to the SM mode or the non-MIMO mode;
  • the current uplink data transmission mode is the SM mode, it is detected whether the current time period reaches the preset fourth transmission mode switching period, and if yes, the uplink data is based on the packet error rate P and the total number of packets N_Total in the period.
  • the transmission mode is switched to the space-time coded STC mode.
  • the present invention further provides an uplink MIMO adaptive apparatus, including: an uplink data transmission mode determining module, configured to determine that a current uplink data transmission mode is one of a non-MIMO mode, a virtual MIMO mode, an STC mode, or an SM mode.
  • an uplink data transmission mode determining module configured to determine that a current uplink data transmission mode is one of a non-MIMO mode, a virtual MIMO mode, an STC mode, or an SM mode.
  • the uplink data transmission mode switching module is configured to select, according to the determined current transmission mode, that the current time period reaches a preset transmission mode switching period, and select an optimal according to the packet error rate P and the total number of packets N_Total in the period.
  • the transmission mode performs uplink data transmission.
  • the uplink data transmission mode switching module includes:
  • Non-MIMO mode switching module if the current uplink data transmission mode is non- In the MIMO mode, it is detected whether the current time period reaches the preset first transmission mode switching period. If yes, the uplink data transmission mode is switched according to the packet error rate ⁇ , the total number of packets N_Total, and the uplink congestion coefficient. For virtual MIMO mode or STC mode;
  • the virtual MIMO mode switching module is configured to detect whether the current time period reaches a preset second transmission mode switching period if the current uplink data transmission mode is the virtual MIMO mode, and if yes, according to the packet error rate P and the period The total number of packages N- Total is disassembled;
  • the STC mode switching module is configured to detect whether the current time period reaches a preset third transmission mode switching period if the current uplink data transmission mode is the STC mode, and if yes, according to the packet error rate P and the total packet in the period.
  • the number N-Total and channel correlation switch the transmission mode of the uplink data to the SM mode or the non-MIMO mode;
  • the SM mode switching module is configured to detect whether the current time period reaches a preset fourth transmission mode switching period if the current uplink data transmission mode is the SM mode, and if yes, according to the packet error rate P and the total packet in the cycle.
  • the number N-Total switches the transmission mode of the uplink data to the STC mode.
  • the method and the device provided by the present invention can solve the problem of utilizing resources in the system that cannot be optimized by using any non-MIMO mode or MIMO mode in the prior art, and provide a flexible data transmission mode for the user;
  • the packet transmission rate, congestion, correlation, etc. adaptively select the transmission mode of the uplink data, and improve the uplink throughput of the system on the basis of ensuring the reliability of the link.
  • 1 is a schematic diagram of the principle of data transmission in the STC mode in the prior art
  • FIG. 1 is a schematic diagram of the principle of data transmission in the SM mode in the prior art
  • 3 is a schematic diagram of the principle of uplink virtual MIMO in the prior art
  • FIG. 4 is a schematic flowchart of a MIMO adaptive method according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a current non-MIMO processing process according to an embodiment of the present invention
  • FIG. 6 is a schematic flowchart of a current virtual MIMO processing process according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a current STC processing flow according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a current SM processing flow according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a MIMO adaptive apparatus according to an embodiment of the present invention. detailed description
  • An embodiment of the present invention provides an uplink MIMO adaptive method, including: determining a current uplink data transmission manner, and transmitting uplink data according to a packet error rate P, a total number of packets N—Total, an uplink congestion coefficient, and a channel correlation.
  • the optimal transmission mode is selected for the uplink data transmission, that is, the current uplink data transmission mode is determined to be in the non-MIMO mode, the virtual MIMO mode, the STC mode, or the SM mode.
  • the uplink data is selected according to the error packet rate P and the total number of packets N_Total in the period. transmission.
  • the current uplink data transmission mode is a non-MIMO mode
  • the current uplink data transmission mode is the virtual MIMO mode
  • the current uplink data transmission mode is the STC mode, it is detected whether the current time period reaches the preset third transmission mode switching cycle.
  • an uplink MIMO adaptive method provided by an embodiment of the present invention may be:
  • Step 401 Determine whether uplink MIMO adaptation is enabled, that is, whether the terminal supports the MIMO handover function, and if yes, proceed to step 402, otherwise proceed to step 410.
  • Step 402 Determine whether the current uplink data transmission is in the non-MIMO mode. If yes, go to step 403; otherwise, go to step 404.
  • Step 403 Enter the current non-MIMO processing flow, and then proceed to step 410.
  • Step 404 Determine whether the current uplink data transmission is in the virtual MIMO mode. If yes, go to step 405; otherwise, go to step 406.
  • Step 405 Enter the current virtual MIMO processing flow, and then proceed to step 410.
  • Step 406 Determine whether the current uplink data transmission is in the STC mode. If yes, go to step 407, otherwise go to step 408.
  • Step 407 Enter the current STC processing flow, and then proceed to step 410.
  • Step 408 Determine whether the current uplink data transmission is in the SM mode. If yes, proceed to step 409, otherwise proceed to step 410.
  • Step 409 Enter the current SM processing flow, and then proceed to step 410.
  • Step 410 End the process.
  • the above determination of the transmission mode in which the current uplink data transmission is performed may be implemented based on determining the value of the transmission mode flag bit.
  • the foregoing processing may be performed in a base station, and after the base station determines an optimal transmission mode, the terminal may be notified by control signaling.
  • the packet error rate counted during the set period is P: the packet error rate is the packet and total packet of the transmission error during the period.
  • the ratio of the number can reflect the current channel condition of the terminal by the error packet rate. If the packet error rate is greater than a certain threshold, the channel condition is considered to be deteriorated.
  • the total number of packets is N—Total: If the total number of packets in the period is lower than the threshold, the terminal is considered to have no service.
  • the setting of the specific threshold is related to the actual situation.
  • the correlation coefficient is Q (the minimum eigenvalue of the channel matrix / the maximum eigenvalue of the channel matrix):
  • the channel correlation reflects the independence between the channels, which can be expressed by the correlation coefficient, ie the minimum eigenvalue and maximum adjustment of the channel matrix
  • the ratio of values is expressed. If the ratio is 0, the channel is fully correlated, and the system will not be able to distinguish the data arriving by each channel; if the ratio is 1, the channel is completely independent, and the system can distinguish the data reached by each channel. If the channels are completely independent, then the SM can be successfully decoded. In the actual environment, the channels cannot be completely independent. As long as the correlation satisfies certain conditions, that is, the correlation coefficient is greater than the threshold, the SM can be successfully decoded.
  • the setting of the threshold is related to the actual environment.
  • the current non-MIMO processing flow in step 403 may specifically include:
  • Step 501 Count, according to the frame, a time period in which the current uplink data is transmitted through the non-MIMO mode;
  • Step 502 Determine whether the time period reaches the non-MIMO statistical period N1, if yes, proceed to step 503, otherwise proceed to step 511;
  • Step 503 Calculating the error packet rate P and the total number of packets in the cycle N_Total;
  • Step 504 Determine whether the total number of packets N_Total is greater than the threshold value P1, if yes, proceed to step 505, otherwise proceed to step 511;
  • Step 505 Determine whether the packet error rate is greater than the threshold value P5, if yes, proceed to step 509, otherwise proceed to step 506;
  • Step 506 Determine whether the uplink congestion coefficient is greater than the threshold P10, if yes, proceed to step 507, otherwise proceed to step 511;
  • Step 507 searching for a suitable terminal pairing
  • Step 508 Determine whether a suitable terminal is found, if yes, proceed to step 509, otherwise proceed to step 510;
  • Step 509 Switch to the STA mode, and proceed to step 511.
  • Step 510 Trigger the terminal to perform pairing, and proceed to step 511;
  • Step 511 End the process.
  • the current virtual MIMO processing process specifically includes:
  • Step 601 Count the time period in which the current uplink data is transmitted through the virtual MIMO mode according to the frame.
  • Step 602 Determine whether the time period reaches the virtual MIMO statistical period N2. If yes, go to step 603; otherwise, go to step 607.
  • Step 603 Calculate the packet error rate P and the total number of packets N—Total.
  • Step 604 Determine whether the total number of packets in the period N_Total is lower than the threshold value P2, and if yes, proceed to step 606, otherwise proceed to step 605.
  • Step 605 Determine whether the packet error rate P in the period is greater than a threshold value P6, and if yes, enter Step 606, otherwise proceed to step 607.
  • Step 606 Perform the disassembly process, and proceed to step 607.
  • Step 607 End the process.
  • the current uplink data transmission mode is STC mode, where the STC statistics period is N3, the STC has no traffic decision threshold of P3, the STC transmission stability decision threshold is P9, and the STC enters SM when the correlation coefficient threshold is P11, in a specific application, step 407
  • the current STC processing flow may specifically include:
  • Step 701 Count the time period in which the current uplink data is transmitted through the STC mode according to the frame.
  • Step 702 Determine whether the time period reaches the STC statistical period N3. If yes, go to step 703, otherwise go to step 709.
  • Step 703 The error packet rate and the total number of packets in the statistical period are N - Total.
  • Step 704 Determine whether the total number of packets N_Total is lower than the threshold value P3. If yes, proceed to step 705; otherwise, proceed to step 706.
  • Step 705 Switch to the non-MIMO mode, and go to step 709.
  • Step 706 Determine whether the packet error rate is lower than the threshold value P9. If yes, proceed to step 707; otherwise, proceed to step 709.
  • Step 707 Determine whether the channel correlation is greater than P11. If yes, go to step 708, otherwise go to step 709.
  • Step 708 Switch to the SM (terminal has SM capability) mode, and proceed to step 709.
  • Step 709 End the process.
  • Step 801 Count the time period in which the current uplink data is transmitted through the SM mode according to the frame statistics.
  • Step 802 Determine whether the time period reaches the SM statistical period N4, and if yes, advance Go to step 803, otherwise go to step 807.
  • Step 803 Calculate the packet error rate P and the total number of packets N-Total.
  • Step 804 Determine whether the total number of packets in the period is lower than the threshold value P4. If yes, proceed to step 806, otherwise proceed to step 805.
  • Step 805 Determine whether the packet error rate is greater than the threshold value P7. If yes, proceed to step 806, otherwise proceed to step 807.
  • Step 806 Switch to the STC mode, and go to step 807.
  • Step 807 End the process.
  • an embodiment of the present invention further provides an uplink MIMO adaptive apparatus, including an uplink data transmission mode determining module 901 and an uplink data transmission mode switching module 906:
  • the uplink data transmission mode determining module 901 is configured to determine that the current uplink data transmission mode is one of a non-MIMO mode, a virtual MIMO mode, an STC mode, or an SM mode;
  • the uplink data transmission mode switching module 906 is configured to select, according to the determined current transmission mode, that the current time period reaches a preset transmission mode switching period, and select an optimal according to the packet error rate P and the total number of packets N_Total in the period.
  • the transmission mode performs uplink data transmission.
  • the uplink data transmission mode switching module 906 includes: a non-MIMO mode switching module 902, a virtual MIMO mode switching module 903, an STC mode switching module 904, and an SM mode switching module 905:
  • the non-MIMO mode switching module 902 is configured to detect whether the current time period reaches a preset first transmission mode switching period if the current uplink data transmission mode is a non-MIMO mode, and if yes, according to a packet error rate in the period.
  • the total number of packets N-Total and the uplink congestion coefficient switch the transmission mode of the uplink data to the virtual MIMO mode or the STC mode;
  • the virtual MIMO mode switching module 903 is configured to detect whether the current time period reaches a preset second transmission mode switching period if the current uplink data transmission mode is the virtual MIMO mode, and if yes, according to the packet error rate P in the period. And the total number of packages N-Total is disassembled;
  • the STC mode switching module 904 is configured to detect whether the current time period reaches a preset third transmission mode switching period if the current uplink data transmission mode is the STC mode, and if yes, according to the packet error rate in the period?
  • the SM mode switching module 905 is configured to detect whether the current time period reaches a preset fourth transmission mode switching period if the current uplink data transmission mode is the SM mode, and if yes, according to the packet error rate P and the total period.
  • the number of packets N-Total switches the transmission mode of the uplink data to the STC mode.
  • the non-MIMO mode switching module 902 switches the transmission mode of the uplink data to the virtual MIMO mode or the STC mode according to the packet error rate P, the total packet number N_Total, and the uplink congestion coefficient in the cycle, and specifically includes:
  • Step A1 determining a packet error rate of the uplink data transmission in the period P, a total number of packets N—Total, and a congestion coefficient;
  • Step A2 determining whether the total number of packets N_Total is greater than a preset first traffic determination threshold, and if yes, proceeding to step A3, otherwise ending the process;
  • Step A3 determining whether the packet error rate is greater than a preset first transmission stability decision threshold, if yes, proceeding to step A5, otherwise proceeding to step A4;
  • Step A4 determining whether the uplink congestion coefficient is greater than a preset first uplink congestion threshold, and if yes, proceeding to step A5, otherwise ending the process;
  • Step A5 Determine whether the paired terminal is found. If yes, switch the transmission mode of the uplink data to the STC mode. Otherwise, the terminal is triggered to perform pairing, and the process ends.
  • the virtual MIMO mode switching module 903 performs the splitting process according to the error packet rate P and the total number of packets N_Total in the cycle, including:
  • Step B1 determining the error packet rate P of the uplink data transmission in the period and the total number of packets N_Total; Step B2, determining whether the total number of packets N-Total in the period is lower than the preset second traffic Threshold, if yes, proceed to step B4, otherwise proceed to step B3;
  • Step B3 determining whether the packet error rate in the period is greater than a preset second transmission stability decision threshold, and if yes, proceeding to step B4, otherwise entering the step ending process;
  • step B4 the disassembly process is performed, and the process ends.
  • the STC mode switching module 904 switches the transmission mode of the uplink data to the SM mode or the non-MIMO mode according to the packet error rate P, the total packet number N_Total, and the channel correlation in the cycle, including:
  • Step C1 determining a packet error rate and a total number of packets of the uplink data transmission in the period, N—Total;
  • Step C2 determining whether the total number of packets N-Total is lower than a preset third traffic determination threshold, if yes, switching the transmission mode of the uplink data to the non-MIMO mode, and ending the process, otherwise proceeding to step C3;
  • Step C3 determining whether the packet error rate is lower than a preset third transmission stability decision threshold, and if yes, proceeding to step C4; otherwise, ending the process;
  • Step C4 Determine whether the channel correlation is greater than the correlation coefficient threshold. If yes, the uplink data transmission mode is switched to the SM mode, otherwise the process ends.
  • the SM mode switching module 905 switches the transmission mode of the uplink data to the STC mode according to the packet error rate P and the total number of packets N_Total in the period, and specifically includes:
  • Step D1 determining a packet error rate P and a total number of packets N_Total of the uplink data transmission in the period;
  • Step D2 determining whether the total number of packets is lower than a preset fourth traffic determination threshold, and if yes, going up
  • the data transmission mode is switched to the STC mode, otherwise it proceeds to step D3;
  • Step D3 Determine whether the packet error rate is greater than a preset fourth transmission stability decision threshold. If yes, the uplink data transmission mode is switched to the STC mode, otherwise the process ends.
  • the terminal If the terminal does not have uplink traffic, the terminal is in the uplink non-MIMO state, and a transmitting antenna is used to reduce the interference of the terminal to other terminals and reduce the overall interference of the system.
  • the terminal is in the uplink non-MIMO state, if the transmission is unstable or the uplink is congested. If there is no suitable terminal for pairing, it switches to the uplink STC state; if congestion occurs on the uplink and the transmission is stable, then a suitable terminal is searched for pairing, and when it is found, it enters the uplink virtual MIMO state.
  • the terminal is in the uplink virtual MIMO state. If the terminal has no traffic or the transmission is unstable, the terminal is disconnected.
  • the terminal is in the uplink STC state, and switches to the uplink non-MIMO state if there is no upstream traffic; if the transmission is stable and the correlation meets the condition, it switches to the SM state to provide the system uplink throughput.
  • the terminal is in the uplink SM state. If the terminal has no traffic or the transmission is unstable and goes to the STC state, the system stability and interference can be improved.

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

Abstract

L'invention concerne un procédé et un dispositif adaptatifs pour système multiple input-multiple output (MIMO), s'appliquant au domaine technique de la communication. Ledit procédé comprend comme étapes: déterminer le mode actuel de transmission de données en liaison montante, puis sélectionner le mode optimal de transmission compte tenu du taux d'erreurs sur les paquets P, du nombre total de paquets (N_Total), du coefficient d'encombrement en liaison montante et de la corrélation de canaux, parmi les modes suivants: mode non MIMO, mode MIMO virtuel, mode de codage spatio-temporel (STC) ou mode de multiplexage spatial (SM), pour transmettre des données en liaison montante. Le procédé et le dispositif selon l'invention permettent d'apporter une solution au problème rencontré dans l'art antérieur, d'incapacité d'optimiser l'utilisation de ressources système et de fournir des modes flexibles de transmission de données à des utilisateurs, la transmission de données ne s'effectuant qu'au moyen d'un seul mode non MIMO ou MIMO. Selon le procédé et le dispositif de l'invention, le mode de transmission de données en liaison montante est sélectionné de manière adaptative compte tenu de conditions telles que le taux d'erreurs sur les paquets, l'encombrement ou la corrélation, ce qui permet d'améliorer le rendement en liaison montante du système, par fiabilité des liaisons.
PCT/CN2011/082235 2010-11-17 2011-11-15 Procédé et dispositif adaptatifs pour système mimo en liaison montante WO2012065544A1 (fr)

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CN101431778A (zh) * 2007-11-06 2009-05-13 大唐移动通信设备有限公司 一种多入多出模式自适应切换方法及装置
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