WO2011134137A1 - Procédé d'ajustement de modulation et de codage adaptatifs et station de base associée - Google Patents

Procédé d'ajustement de modulation et de codage adaptatifs et station de base associée Download PDF

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Publication number
WO2011134137A1
WO2011134137A1 PCT/CN2010/072209 CN2010072209W WO2011134137A1 WO 2011134137 A1 WO2011134137 A1 WO 2011134137A1 CN 2010072209 W CN2010072209 W CN 2010072209W WO 2011134137 A1 WO2011134137 A1 WO 2011134137A1
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Prior art keywords
amc
threshold
base station
packets
adjustment value
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PCT/CN2010/072209
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English (en)
Chinese (zh)
Inventor
唐枫
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中兴通讯股份有限公司
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Priority to PCT/CN2010/072209 priority Critical patent/WO2011134137A1/fr
Publication of WO2011134137A1 publication Critical patent/WO2011134137A1/fr

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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
    • H04L1/20—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
    • 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
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
    • H04L1/0021—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach in which the algorithm uses adaptive thresholds
    • 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
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal

Definitions

  • the present invention relates to wireless communication technologies, and in particular, to an Adaptive Modulation & Coding (AMC) adjustment method and a base station.
  • AMC Adaptive Modulation & Coding
  • a base station refers to a device that provides services to a terminal, and the base station communicates with the terminal through uplink and downlink.
  • Downlink refers to the direction from the base station to the terminal
  • uplink refers to the direction from the terminal to the base station.
  • a plurality of terminals can simultaneously transmit data to the base station through the uplink, or can simultaneously receive data from the base station through the downlink.
  • Orthogonal Frequency Division Multiple Access (OFDMA) technology is a mainstream technology for wireless communication physical layer technology because it can effectively resist multipath interference and narrowband interference and high spectral efficiency.
  • OFDMA+MIMO Compared with the third generation CDMA technology, the technology has natural technical advantages and is more suitable for broadband mobile communication systems. It is recognized as one of the core technologies of the next generation mobile communication system.
  • Worldwide Interoperability for Microwave Access (WiMAX) is the next-generation mobile communication standard that adopts OFDMA technology as the core technology of the physical layer and takes into account the mobility and broadband characteristics of the WiMAX 802.16e standard and the 802.16m standard under development. Strong competitors.
  • the condition that the base station side determines the downlink adjustment coding mode can only be based on the carrier-to-interference plus noise ratio (CINR) and the received signal strength indication (RSI).
  • CINR and RSSI do not accurately reflect the downlink traffic transmission status, and the base station is 4 ⁇ . It is difficult to adaptively identify different mobile station types, which results in the modulation coding scheme (MCS) selected by the base station according to the downlink signal to noise ratio and cannot fully meet the requirements of all types of terminals.
  • MCS modulation coding scheme
  • the following examples illustrate: There may be many different types of terminals in a commercial network. Different internal manufacturers use different internal chips, which may cause actual differences in the algorithm for channel estimation of downlink signals, such as under the same base station, the terminal manufacturer.
  • the terminal 1 produced by a and the terminal 2 produced by the terminal manufacturer b are in the same position, and different downlink signals may be detected, namely CINR1 and CINR2, respectively, and fed back to the base station through the fast feedback channel, and then the base station is based on the terminal.
  • the reported downlink CINR is the MCS that the terminal should use to select the current frame.
  • the DIUC Download Interval Usage Code
  • the base station needs to preset an AMC threshold configuration table for the terminal to select the MCS.
  • the AMC threshold configuration table can be as shown in Table 1:
  • the parameters involved in the AMC threshold configuration table shown in Table 1 are the downlink burst attribute index value (DIUC), the modulation and coding rate, and the FEC code type (Modulation and FEC Rate), the entry threshold (Entry Thresh) and the exit threshold. (Exit Thresh), which defines three modulation and coding modes DIUC1, DIUC2, and DIUC3.
  • DIUC downlink burst attribute index value
  • MODulation and FEC Rate Modulation and FEC Rate
  • Entry threshold Entry Thresh
  • exit threshold which defines three modulation and coding modes DIUC1, DIUC2, and DIUC3.
  • Table 1 when the downlink CINR reported by the terminal is 13db, it is higher than the entry threshold of DIUC2 and lower than the exit threshold of DIUC2, according to The principle of SNR decision, the corresponding terminal DLBurst uses DIUC2.
  • the MCS1 calculated according to the CINR1 fed back by the terminal a and the MCS2 calculated according to the CINR2 fed back by the terminal b may not be suitable for the actual demodulation capability of the terminal, according to the difference in the downlink CINR fed back by the terminal. Or, at a certain moment on the terminal The reported CINR does not reflect the demodulation capability of the actual terminal. If there is serious interference, the base station can hardly identify the MCS that the terminal should actually use according to the CINR. Therefore, if the base station only uses one set of AMC thresholds, it is easy to cause a large number of systems. Serious problems with packet loss and overall network throughput decline. Summary of the invention
  • the main object of the present invention is to provide an AMC adjustment method and a base station, which can reduce the packet error rate of the terminal and improve network throughput and stability.
  • An adaptive modulation coding AMC adjustment method includes:
  • the base station counts the total number of packets and the number of error packets transmitted by the terminal in an adjustment period
  • the base station calculates a packet error rate according to the total number of packets and the number of error packets, and determines an AMC threshold adjustment value according to the calculated packet error rate;
  • the base station adjusts the AMC threshold according to the determined AMC threshold adjustment value.
  • the base station After the base station adjusts the AMC threshold according to the determined AMC threshold adjustment value, the base station further includes: the base station selects a modulation and coding mode for the terminal according to the adjusted AMC threshold.
  • the total number of packets transmitted by the statistical terminal is: Statistics are performed according to the number of downlink packets actually allocated by the base station to the terminal.
  • the number of error packets transmitted by the statistic terminal is: According to an automatic retransmission request mechanism or a hybrid automatic retransmission request mechanism, statistics are performed according to downlink ACK/NACK information fed back by the terminal.
  • the error rate is calculated according to the total number of packets and the number of error packets: Calculating the ratio of the number of error packets to the total number of packets as the packet error rate.
  • the base station determines an AMC threshold adjustment value according to the calculated error packet rate:
  • the initial value of the AMC threshold adjustment value plus the value of the upward adjustment step is used as the AMC threshold adjustment value; If the error packet rate is lower than the low packet error rate threshold, the value of the AMC threshold initial value minus the downward adjustment step size is used as the AMC threshold adjustment value;
  • the initial value of the AMC threshold adjustment value is not processed.
  • the base station adjusts the AMC threshold according to the determined AMC threshold adjustment value to: superimpose the AMC threshold adjustment value and the corresponding AMC threshold to obtain an adjusted AMC threshold.
  • a base station includes: a statistical unit, an AMC threshold adjustment value determining unit, and an AMC threshold adjusting unit; wherein
  • the statistics unit is configured to count the total number of packets and the number of error packets transmitted by the terminal in an adjustment period
  • the AMC threshold adjustment value determining unit is configured to calculate a packet error rate according to the total number of packets and the number of error packets counted by the statistical unit, and determine an AMC threshold adjustment value according to the calculated error packet rate; the AMC threshold adjustment unit And configured to adjust the AMC threshold according to the AMC threshold adjustment value determined by the AMC threshold adjustment value determining unit.
  • the base station further includes a modulation and coding mode selection unit, configured to select a modulation and coding mode for the terminal according to the threshold of the AMC threshold adjustment unit adjustment.
  • the statistics unit counts the total number of packets transmitted by the terminal as follows: The statistics unit performs statistics according to the number of downlink packets actually allocated by the base station to the terminal.
  • the statistics unit counts the number of error packets transmitted by the terminal as follows: The statistics unit performs statistics according to the downlink ACK/NACK information fed back by the terminal based on the automatic retransmission request mechanism or the hybrid automatic repeat request mechanism.
  • the AMC threshold adjustment value determining unit calculates the error packet rate according to the total number of packets and the number of error packets counted by the statistical unit: The AMC threshold adjustment value determining unit calculates the ratio of the number of error packets to the total number of packets as the packet error rate. Set the initial value of the AMC threshold adjustment value, the high error rate threshold, the low error rate threshold, the downward adjustment step, and the upward adjustment step.
  • the AMC threshold adjustment value determining unit determines an AMC threshold adjustment value according to the calculated packet error rate:
  • the initial value of the AMC threshold adjustment value plus the value of the upward adjustment step is used as the AMC threshold adjustment value
  • the AMC threshold initial value minus the downward adjustment step value is used as the AMC threshold adjustment value
  • the initial value of the AMC threshold adjustment value is not processed.
  • the AMC threshold adjustment unit adjusts the AMC threshold according to the determined AMC threshold adjustment value to: the AMC threshold adjustment unit superimposes the AMC threshold adjustment value on the corresponding AMC threshold to obtain an adjusted AMC threshold. .
  • the AMC adjustment method and the base station of the present invention combine the feedback mechanism of the downlink error packet to perform statistics on the total number of packets and the number of error packets transmitted by the downlink service, calculate the packet error rate according to the statistical information, and approximate the downlink data transmission quality, thereby
  • the threshold of the downlink AMC is adjusted in real time. Since the present invention dynamically adjusts the AMC threshold of the terminal, it can adapt to the downlink demodulation performance of terminals of different types and different types of terminals (commercial terminals under commercial conditions), thereby being able to control the downlink packet error rate of the terminal to be constant. Within a small range, the packet error rate of the terminal is reduced, and the network throughput and stability are effectively improved.
  • FIG. 1 is a schematic flow chart of an AMC adjustment method according to the present invention.
  • FIG. 2 is a schematic structural diagram of a base station according to the present invention.
  • FIG. 3 is a schematic flowchart of an AMC adjustment method according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a data packet transmission example of the present invention
  • FIG. 5 is a schematic diagram of an AMC threshold adjustment example according to the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic idea of the present invention is: combining the feedback mechanism of downlink packet error, performing statistics on the total number of packets and the number of error packets transmitted by the downlink service, and calculating the packet error rate according to the statistical information, and approximating the downlink data transmission quality. Therefore, the threshold of the downlink AMC is adjusted in real time to meet the needs of the current downlink data transmission.
  • FIG. 1 is a schematic flowchart of an AMC adjustment method according to the present invention. As shown in FIG. 1, the AMC adjustment method of the present invention includes:
  • Step 101 The base station counts the total number of packets TotalPackNum and the number of error packets ErrorPackNum transmitted by the terminal in an adjustment period nW AMC .
  • this period is also a period of AMC threshold adjustment, and the adjustment of the threshold needs to be based on The actual demand is adjusted to adapt to the changing channel conditions. Therefore, in actual applications, the adjustment period needs to be set in advance.
  • the base station counts the total number of packets and the number of error packets actually transmitted by the terminal in the adjustment period.
  • the type of the packet may be Burst based, Protocol Data Unit (PDU), or Based on bit bits, etc.
  • the statistics of the total number of packets by the base station can be obtained according to the number of downlink packets actually allocated by the base station to the terminal, and the statistics of the number of error packets need to depend on a certain feedback mechanism, such as an automatic repeat request (ARQ) or hybrid automatic.
  • ARQ automatic repeat request
  • HARQ Hybrid-ARQ
  • the Hybrid-ARQ (HARQ) mechanism is used to perform statistics on the number of error packets transmitted by the downlink service according to the downlink ACK/NACK information fed back by the terminal.
  • the ARQ technology automatically requests a retransmission error frame when the receiving station receives a message (frame) containing erroneous data.
  • the principle of ARQ is to automatically retransmit the erroneous data frames. It is one of the methods used in communication to deal with errors caused by channels.
  • the HARQ technology introduces a forward error correction code (FEC) in the ARQ system, which can be used to correct data errors during transmission, that is, if the error is within the error correction range of the FEC, the FEC performs error correction if Beyond its error correction range, it is necessary to request a retransmission.
  • FEC forward error correction code
  • the downlink ARQ and HARQ technologies have one similarity in that the receiver needs to feed back ACK/NACK information, so that the sender can pass the quality of the ACK/NACK statistic data transmitted by the receiver, and use it as an important factor for judging the AMC threshold adjustment. in accordance with.
  • the retransmission mechanism of the downlink HARQ and the ARQ is that the base station first buffers the transmitted burst (Subburst), and notifies the terminal to feed back the Subburst ACK/NACK information in a fixed area through the DCD broadcast message.
  • the base station initiates retransmission of the same Subburst.
  • the base station considers that the transmission is successful without retransmission.
  • Step 102 The base station calculates a packet error rate (PER) based on the total number of packets TotalPackNum and the number of error packets ErrorPackNum.
  • PER packet error rate
  • Step 103 The base station determines an AMC threshold adjustment value according to the calculated error packet rate PER. AMCAdj Value
  • the selection of the terminal MCS is determined according to the downlink CINR reported by the terminal and the preset AMC threshold table (as shown in Table 1), and the initial value of the AMCAdjValue is generally set to zero.
  • the AMC threshold is uniformly adjusted downward.
  • reduce the downward adjustment step DownStepAMCAdj when PER is lower than or equal to HighThresh and higher than or equal to LowThresh, no adjustment is made to AMCAdjValue.
  • the high packet error rate threshold HighThresh, low packet error rate threshold LowThresh, downward adjustment step DownStepAMCAdj, upward adjustment step size UpStepAMCAdj can be preset according to actual needs.
  • Step 104 The base station performs the AMC threshold according to the AMC threshold adjustment value AMCAdjValue.
  • the AMCAdjValue is directly applied to the AMC threshold in the AMC threshold table, and the AMC threshold adjustment value is superimposed to the corresponding AMC threshold to obtain the adjusted AMC threshold.
  • the threshold will be appropriately increased.
  • the MCS is adjusted again, the error rate is reduced by reducing the order; if the error rate is very small before the adjustment, the threshold is Will be properly reduced, when re-doing MCS adjustment, will increase the system throughput by upgrading.
  • Step 105 The base station selects the MCS for the terminal according to the adjusted threshold.
  • the base station includes: a statistical unit 201, an AMC threshold adjustment value determining unit 202, and an AMC threshold adjusting unit 203;
  • the statistics unit 201 is configured to count the total number of packets and the number of error packets transmitted by the terminal in an adjustment period, where the adjustment period is preset by the base station;
  • the AMC threshold adjustment value determining unit 202 is configured to calculate a packet error rate according to the total number of packets and the number of error packets counted by the statistical unit 201, and determine an AMC threshold adjustment value according to the calculated packet error rate;
  • the AMC threshold adjustment unit 203 is configured to adjust the AMC threshold according to the AMC threshold adjustment value determined by the AMC threshold adjustment value determining unit 202.
  • the base station further includes a modulation and coding mode selecting unit 204, configured to adjust the single order according to the AMC threshold
  • the adjusted threshold of the element 203 is a modulation coding mode selected by the terminal.
  • the statistics unit 201 counts the total number of packets transmitted by the terminal as follows: The statistics unit performs statistics according to the number of downlink packets actually allocated by the base station to the terminal.
  • the statistics unit 201 counts the number of error packets transmitted by the terminal as follows: The statistics unit performs statistics according to the downlink ACK/NACK information fed back by the terminal based on the automatic retransmission request mechanism or the hybrid automatic repeat request mechanism.
  • the AMC threshold adjustment value determining unit 202 calculates the error packet rate based on the total number of packets and the number of error packets counted by the statistical unit: The AMC threshold adjustment value determining unit 202 calculates the ratio of the number of error packets to the total number of packets as the packet error rate.
  • the AMC threshold adjustment value determining unit 202 determines, according to the calculated packet error rate, that the base station sets the AMC threshold adjustment value initial value, the high packet error rate threshold, the low packet error rate threshold, the downward adjustment step size, and the upward adjustment step size.
  • the AMC threshold adjustment value is:
  • the initial value of the AMC threshold adjustment value plus the value of the upward adjustment step is used as the AMC threshold adjustment value
  • the AMC threshold initial value minus the downward adjustment step value is used as the AMC threshold adjustment value
  • the initial value of the AMC threshold adjustment value is not processed.
  • the AMC threshold adjustment unit 203 adjusts the AMC threshold according to the determined AMC threshold adjustment value to:
  • the AMC threshold adjustment unit 203 superimposes the AMC threshold adjustment value with the corresponding AMC threshold to obtain an adjusted AMC threshold. .
  • FIG. 3 is a schematic flowchart of an AMC adjustment method according to an embodiment of the present invention. As shown in FIG. 3, the method includes: Step 301: For the ACK/NACK statistics, set a statistical period P in units of ms (milliseconds), and perform statistics in the period P, that is, within a certain number of frames, and the period may be adjusted according to actual needs.
  • Step 302 Count the total number of packets and the number of error packets in the period P, and calculate the packet error rate according to the total number of packets and the number of error packets.
  • the BER Berst Error Ratio
  • TotalBurstNum represents the total number of packets transmitted during the period (subburst), including the number of retransmitted packets; ErrorBurstNum indicates the number of packets in the period, that is, the total number of packets fed back NACK.
  • Step 303 Adjust the AMC threshold adjustment value a according to the error packet rate BER.
  • the BER is compared with a target threshold.
  • the large target threshold is b bigThresh ;
  • Threshold up adjustment step is
  • the threshold is adjusted downward by e. w mein;
  • the maximum threshold adjustment is ⁇ _;
  • the minimum threshold adjustment is ;
  • the size of the adjustment value needs to be limited to determine whether the set range is exceeded.
  • Step 304 Adjust the AMC threshold in the AMC threshold table according to the AMC threshold adjustment value a obtained in step 303.
  • the AMC adjustment value a directly acts on the AMC threshold value, and the MCC entry threshold and the exit threshold in the AMC threshold table are accumulated with the adjustment value a to obtain the adjusted AMC threshold table.
  • Step 305 Select the MCS for the terminal according to the adjusted AMC threshold table.
  • the algorithm selected by the MCS can compare with the adjusted AMC threshold according to the signal-to-noise ratio fed back by the terminal, and calculate the MCS more suitable for the terminal.
  • the invention introduces the feedback mechanism of the downlink error packet, and can adjust the threshold value in real time and reasonably, thereby controlling the error packet rate in a more reasonable range, not only improving the stability of the entire network, but also improving the user. Throughput.
  • the present invention is particularly remarkable. Even a terminal of the same type has a problem of difference in downlink demodulation performance. Therefore, the present invention is based on a method for determining a downlink signal-to-noise ratio. At the same time, combining the downlink data transmission quality to select the MCS is an inevitable trend for the commercial network to mature, and has a huge market space.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Artificial Intelligence (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé d'ajustement de Modulation et de Codage Adaptatifs (AMC, Adaptive Modulation and Coding) qui consiste à : fixer une période d'ajustement ; faire en sorte qu'une Station de Base (BS) calcule statistiquement le nombre de paquets totaux et le nombre de paquets d'erreurs envoyés par un terminal pendant une période d'ajustement ; faire en sorte que la BS calcule le Taux d'Erreurs sur les Paquets (PER, Packet Error Ratio) sur la base du nombre calculé de paquets totaux et du nombre calculé de paquets d'erreurs et qu'elle détermine une valeur d'ajustement d'un seuil AMC en fonction du PER calculé ; faire en sorte que la BS ajuste le seuil AMC sur la base de la valeur d'ajustement déterminée pour le seuil AMC. L'invention concerne également une station de base correspondante. La présente invention ajuste dynamiquement les seuils AMC des terminaux afin qu'elle puisse adapter la capacité de démodulation de liaison descendante de différents types de terminaux (terminaux hybrides dans des conditions d'exploitation commerciale) à différents instants. Cela permet donc de réguler les PER descendants des terminaux afin qu'ils se situent dans une certaine gamme basse et d'abaisser les PER des terminaux, et permet en outre d'améliorer efficacement le débit et la stabilité du réseau.
PCT/CN2010/072209 2010-04-26 2010-04-26 Procédé d'ajustement de modulation et de codage adaptatifs et station de base associée WO2011134137A1 (fr)

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WO2019080097A1 (fr) * 2017-10-27 2019-05-02 Hewlett Packard Enterprise Development Lp Ajustement de débits de données dans des réseaux sans fil
US11082880B2 (en) 2017-10-27 2021-08-03 Hewlett Packard Enterprise Development Lp Adjusting data rates in wireless networks
CN110086570A (zh) * 2019-04-08 2019-08-02 西安电子科技大学 一种调制门限调整方法、装置和计算机设备
CN110086570B (zh) * 2019-04-08 2020-08-04 西安电子科技大学 一种调制门限调整方法、装置和计算机设备

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