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WO2010025613A1 - 一种自适应编码调制方法 - Google Patents

一种自适应编码调制方法 Download PDF

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Publication number
WO2010025613A1
WO2010025613A1 PCT/CN2009/000842 CN2009000842W WO2010025613A1 WO 2010025613 A1 WO2010025613 A1 WO 2010025613A1 CN 2009000842 W CN2009000842 W CN 2009000842W WO 2010025613 A1 WO2010025613 A1 WO 2010025613A1
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WO
WIPO (PCT)
Prior art keywords
mcs
actual
base station
mobile station
current
Prior art date
Application number
PCT/CN2009/000842
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English (en)
French (fr)
Inventor
许进
徐俊
王锦山
胡留军
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication of WO2010025613A1 publication Critical patent/WO2010025613A1/zh

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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
    • H04L1/0001—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
    • H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
    • 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
    • H04L1/0009—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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication

Definitions

  • the present invention relates to the field of communications, and in particular, to an adaptive code modulation method. Background technique
  • the basic principle of adaptive modulation and coding is to select an appropriate modulation and coding set (MCS) according to the change of the wireless channel, and the base station side according to the instantaneous channel quality of the user. And the most suitable downlink modulation and coding method for current resource selection.
  • 3GPP Third Generation Partnership Projects
  • LTE Long Term Evolution
  • Wimax Worldwide Interoperability for Microwave Access
  • PC power control
  • the base station's transmit power is fully utilized. The result is: users in favorable positions make full use of system resources to improve the transmission rate when channel conditions are good, and do not increase power when channel conditions are poor. , will not increase interference with other users and cells.
  • AMC uses the fading channel to change the channel characteristics between correlated fading. By measuring the current channel quality, the system's code modulation mode is changed in real time to maximize the throughput of the system.
  • a complete AMC process can be described as follows:
  • the base station A transmits a signal for channel measurement to the mobile station B, and the mobile station B calculates the channel quality of the current time according to the received signal. Then, the mobile station B reports the channel quality of the current time to the base station A according to a certain manner. Finally, base station A selects an appropriate coded modulation mode to transmit data to mobile station B according to the channel quality report.
  • the spectrum efficiency that is, the Modulation Order Product Code Rate (MPR) is determined by the channel quality. The better the channel quality, the higher the MPR value, the worse the channel quality, and the lower the MPR value.
  • MPR Modulation Order Product Code Rate
  • the channel quality information of the mobile station to the base station may be signal to noise rate (SNR) information, channel quality indicator (CQI) information, or the like.
  • CQI is a quantized signal-to-noise ratio.
  • the mobile station needs to ensure that the transport block error probability is less than a certain value according to the CQI fed back within the time interval of a specific reference time slot (for example, in 3GPP). The error probability is less than 10%.
  • Each CQI value has a unique coded modulation mode MCS and a range of SNR intervals corresponding to it. When the CQI value changes from small to large, the corresponding MCS level will also occur from small to large. Variety.
  • the CQI reported by the mobile station to the base station has two forms, one is a full-bandwidth CQI, which is used to reflect the channel quality on the entire bandwidth, and the other is a sub-band CQI (sub-band CQI).
  • the channel quality reflected in some specific frequency bands, such as best-M CQI feedback, is the channel quality on the best M sub-bands; the full-bandwidth CQI feedback period is usually longer than the sub-band CQI, and the sub-band CQI is usually It is reported to the base station in the form of a differential CQI.
  • the downlink transmission control information refers to signaling used by the base station to inform the mobile station of the downlink transmission data format.
  • the downlink transmission control information includes MCS information, physical resource indication information or transport block size information, and power control information.
  • the 16-level MCS table requires 4-bit signaling to represent, while the 64-level MCS table requires 6-bit signaling to represent the control channel. Said, because its spectrum resources are very limited, so try to compress the signaling overhead.
  • HSDPA High Speed Downlink Packet Access
  • the 32-level MCS table is represented by 5-bit signaling; and the Wimax system uses the 11-level MCS table. It is represented by 4-bit signaling. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a new adaptive coding and modulation method for the defects of the prior art, which can reduce the overhead of control signaling and improve the accuracy of MCS selection.
  • the present invention provides an adaptive code modulation method, comprising: a base station and a mobile station locally pre-storing a virtual modulation and coding set MCS table, each base station and mobile station from the virtual MCS table before each data transmission Selecting a number of MCS levels including the MCS level corresponding to the current channel quality information CQI as the actual MCS table in the current transmission;
  • the base station selects, for the mobile station, the MCS level used for the current transmission from the actual MCS table, and sends downlink transmission control information carrying the MCS information of the current transmission to the mobile station; Indicates the MCS level used for this transmission in the actual MCS Location information in the table;
  • the mobile station After receiving the downlink transmission control information, the mobile station learns the MCS used by the base station according to the MCS information and the actual MCS table.
  • the method for the base station and the mobile station to select, from the virtual MCS table, a number of MCS levels including the MCS level corresponding to the current CQI as the actual MCS table in the current transmission includes:
  • the base station and the mobile station divide the virtual MCS table into a plurality of sub-tables of equal length, and the base station and the mobile station find an MCS level corresponding to the current CQI in the virtual MCS table, and the sub-table where the MCS level is located As the actual MCS table in this transmission.
  • the method for the base station and the mobile station to select, from the virtual MCS table, a number of MCS levels including the MCS level corresponding to the current CQI as the actual MCS table in the current transmission includes:
  • the base station and the mobile station find the MCS level corresponding to the current CQI in the virtual MCS table, and select some MCS levels forward and/or backward based on the MCS level as the actual MCS table in the current transmission. .
  • the method for the base station and the mobile station to select, from the virtual MCS table, a number of MCS levels including the MCS level corresponding to the current CQI as the actual MCS table in the current transmission includes:
  • the base station and the mobile station find the MCS level corresponding to the full bandwidth CQI in the virtual MCS table according to the current full bandwidth CQI, and select a number of forward and/or backward based on the MCS level corresponding to the full bandwidth CQI.
  • MCS level as the first part of the MCS level; finding the MCS level corresponding to the sub-band CQI in the virtual MCS table according to the current sub-band CQI, and using the MCS level corresponding to the sub-band CQI as the reference, forward and/or toward A number of MCS levels are selected as the second part of the MCS level; the selected first part of the MCS level and the second part of the MCS level together constitute the actual MCS table in the current transmission.
  • the method for the base station and the mobile station to select, from the virtual MCS table, the MCS level including the MCS level corresponding to the current CQI as the actual MCS table in the current transmission includes: The base station and the mobile station find the MCS level corresponding to the current CQI in the virtual MCS table, and select some MCS levels as the first part of the MCS level forward and/or backward based on the MCS level corresponding to the current CQI; The MCS level group second part MCS level is selected in the rest of the virtual MCS table, and the selected first part MCS level and the second part MCS level together constitute the actual MCS table in the current transmission.
  • the MCS information of the current transmission is the index value of the MCS level used in the current transmission in the actual MCS table in the current transmission.
  • the method for the mobile station to learn the MCS used by the base station according to the MCS information and the actual MCS table includes:
  • the mobile station obtains, from the downlink transmission control information sent by the base station, the index value in the actual MCS table used in the current transmission, and the MCS corresponding to the index value is used by the base station to transmit downlink data.
  • the current MCS information is the offset value of the MCS level used for the current transmission in the actual MCS table in the current transmission with respect to the reference MCS level; the offset value is the actual MCS level and the reference MCS level.
  • the difference is the difference between the reference MCS level and the actual MCS level; the reference MCS level is the MCS level corresponding to the current CQI in the virtual MCS table.
  • the method for the mobile station to learn the MCS used by the base station according to the MCS information and the actual MCS table includes:
  • the mobile station obtains, from the downlink transmission control information sent by the base station, the offset value of the MCS level used in the current transmission in the MCS table actually used in the current transmission with respect to the reference MCS level;
  • the mobile station When the offset value is the difference between the actual MCS level and the reference MCS level, the mobile station adds the offset value to the reference MCS level to obtain the MCS level used for the current transmission in the actual MCS table in the current transmission.
  • the MCS corresponding to the obtained MCS level is the MCS used by the base station to transmit downlink data;
  • the mobile station uses the reference MCS level and the actual MCS level
  • the MCS level is subtracted from the offset value to obtain the MCS level used for the current transmission in the actual MCS table in the current transmission, and the MCS corresponding to the obtained MCS level is the MCS used by the base station to transmit downlink data. Further, before each data transmission, the method further includes:
  • the base station transmits a signal for channel measurement to the mobile station, and the mobile station obtains the CQI of the current time through the channel measurement, and transmits it to the base station.
  • the technical solution of the present invention proposes to use the virtual MCS table to select the MCS table actually used in the granular MCS table, thereby improving the accuracy of the MCS selection and not increasing the technical effect of the control signaling overhead; Compared with the prior art, when the MCS table of the same granularity is used, the control signaling overhead in the present invention is reduced.
  • 1 is a flow chart of a specific implementation of an adaptive code modulation method
  • FIG. 2 is a schematic diagram showing the generation of an MCS table actually used in the application example 1 of the present invention
  • FIG. 3 is a schematic diagram of generating an MCS table actually used in the application example 2 of the present invention.
  • FIG. 4 is a schematic diagram showing the generation of an MCS table actually used in the third application example of the present invention.
  • FIG. 5 is a schematic diagram showing the generation of an MCS table actually used in the application example 4 of the present invention. detailed description
  • the main idea of the present invention is: pre-storing a granular MCS table with fine granularity at both ends of the transmitting and receiving. Before each data transmission, the transmitting and receiving parties select the current transmission from the virtual MCS table according to the same predefined rules.
  • the actual MCS table Compared with the prior art, the invention not only reduces the overhead of control signaling, but also improves the accuracy of MCS selection.
  • the so-called virtual MCS table refers to a MCS table with a fine granularity and a high level of inclusion (such as 32 or 64 levels) set by the base station and the mobile station. It is not directly used to generate the downlink transmission format.
  • the MCS table used is selected from the virtual MCS table and is a sub-table of the virtual MCS table.
  • the present invention provides an adaptive code modulation method, including:
  • the base station and the mobile station pre-store the virtual MCS table locally, and select, from the virtual MCS table, a number of MCS levels including the MCS level corresponding to the current CQI before each transmission, as the current transmission.
  • the actual MCS table; wherein the method for the mobile station and the base station to learn the current CQI can be the same as the prior art, that is, the base station transmits a signal for channel measurement to the mobile station, and the mobile station obtains the channel quality at the current time through channel measurement. Information, and sent to the base station.
  • the base station selects the MCS level used for the current transmission from the actual MCS table for the mobile station (that is, the mobile station that reports the current CQI), and sends the downlink transmission control information carrying the MCS information of the current transmission to the mobile station.
  • the mobile station may also send the data of the current transmission together; the current transmission MCS information is used to indicate the location information of the MCS level used in the current transmission in the actual MCS table, as in the actual use.
  • the mobile station After receiving the downlink transmission control information, the mobile station learns the MCS used by the base station to transmit the downlink data according to the MCS information and the actual MCS table. If the base station sends the data together, the mobile station can learn the base station. After transmitting the MCS used for the downlink data, the MCS and other downlink transmission control information are used to demodulate the downlink data.
  • the channel quality information that the mobile station feeds back to the base station may be a signal to noise rate (SNR) information, or may be a channel quality indicator (CQI) information.
  • SNR signal to noise rate
  • CQI channel quality indicator
  • the mobile station and the base station respectively select the MCS level as the actual MCS table in the current transmission, the selection method is the same, so the actual MCS table obtained in the current transmission is completely the same.
  • the mobile station and the base station select, in the virtual MCS table, a number of MCS levels including the MCS level corresponding to the current channel quality information as the actual MCS table in the current transmission.
  • Method 1 The mobile station and the base station will use the virtual MCS table. Dividing into a plurality of equal-length sub-tables; the base station and the mobile station find an MCS level corresponding to the current CQI in the virtual MCS table according to the current CQI, and the sub-table in which the MCS level is located is actually used in the current transmission.
  • Method 2 The mobile station and the base station find the MCS level corresponding to the current CQI in the virtual MCS table, and use this as a reference to select a certain number of MCS before and after (or only forward, or only backward) Level, as the actual MCS table in this transmission; It should be noted that the selected MCS level may be continuously distributed or non-continuously distributed, but both parties must follow the same criteria.
  • Method 3 The mobile station and the base station find the MCS level corresponding to the full bandwidth CQI in the virtual MCS table according to the current full bandwidth CQI, and For the reference, a certain number of MCS levels are selected as the first partial MCS level before and after (or only forward, or only backward); the MCS level corresponding to the sub-band CQI is found in the virtual MCS table according to the current sub-band CQI, and For this reference, a certain number of MCS levels are selected as the second partial MCS level before and after (or only forward, or only backward); the selected first partial MCS level and the second partial MCS level together constitute the actual transmission.
  • MCS table the selected MCS level may be continuously distributed or non-continuously distributed, but the transmitting and receiving parties must select according to the same criteria;
  • Method 4 The sending and receiving parties find the MCS level corresponding to the current CQI in the virtual MCS table, and use this as a reference to select a certain number of MCS levels as the first partial MCS level before and after (or only forward, or only backward). Then, the transmitting and receiving sides are equally spaced or approximately equally spaced (in practical applications, the selection of unequal intervals is also possible, as long as the selection rules are agreed by the transmitting and receiving parties), and several groups are selected from the remaining positions of the virtual MCS table. The second part of the MCS level, the selected first part of the MCS level and the second part of the MCS level together constitute the actual MCS table in this transmission.
  • the selected MCS levels are continuous, they are arranged according to the original position. If they are discontinuous, they are arranged in descending order.
  • the actual application does not exclude other ways, as long as it is guaranteed.
  • the actual MCS table obtained by both the sender and the receiver can be the same.
  • the MCS level corresponding to the current channel quality information in the virtual MCS table is referred to as the reference MCS level.
  • the channel quality information and the ACK/NACK information may also be comprehensively considered to select an appropriate actual MCS table in the current transmission; or
  • the channel quality information and the scheduling mode (such as persistent scheduling, semi-persistent scheduling, or dynamic scheduling M-speech may also be considered to select an appropriate actual MCS table in the current transmission; or channel quality information and cell users may also be used (eg, The edge cell user or the non-edge cell user) comprehensively considers the information to select the actual MCS table in the current transmission;
  • the determining, by the base station, the MCS level used in the current transmission, and transmitting the downlink transmission control information that carries the MCS information to the mobile station may include:
  • the base station finally determines the MCS level used for the current transmission according to the channel quality information fed back by the mobile station and the MCS determination criterion (ie, a specific scheduling algorithm), etc. (for simplicity of description, the MCS level is hereinafter referred to as the actual MCS level), The method in the prior art is determined;
  • the base station calculates an index value of the actual MCS level in the actual MCS table in the current transmission, or calculates an offset value of the actual MCS level relative to the reference MCS level in the actual MCS table in the current transmission, and the index value Or the offset value is notified to the mobile station as the content of the MCS information part in the downlink transmission control information.
  • the offset value may be the difference between the actual MCS level and the reference MCS level, or may be the difference between the reference MCS level and the actual MCS level.
  • the mobile station may be configured to: according to the received downlink transmission control information and the actual MCS table, the MCS used by the base station to transmit the downlink data may include:
  • the mobile station obtains, from the downlink transmission control information sent by the base station, the index value in the actual MCS table of the actual MCS level in the current transmission, and the MCS corresponding to the index value is the MCS used by the base station to transmit the downlink data;
  • the mobile station obtains, from the downlink transmission control information sent by the base station, an offset value of the actual MCS level relative to the reference MCS level in the actual MCS table in the current transmission, and adds the offset value to the reference MCS level (when If the offset value is the difference between the actual MCS level and the reference MCS level) or subtract the offset value from the reference MCS level (when the offset value is the difference between the reference MCS level and the actual MCS level), the actual value obtained in this transmission is obtained.
  • the corresponding MCS in the MCS table which is the MCS used by the base station to transmit downlink data. Which difference is used as the offset value is agreed by the mobile station and the base station.
  • the specific process of the adaptive code modulation method in the application example 1 is as shown in FIG. 1 , which includes: the mobile station obtains the local downlink channel quality information through channel measurement, and feeds back to the base station, and the channel quality information that the mobile station feeds back to the base station may It is signal-to-noise ratio (SNR) information, and may also be channel quality indicator (CQI) information or the like.
  • SNR signal-to-noise ratio
  • CQI channel quality indicator
  • the base station and the mobile station select a part of the appropriate MCS level component data in the virtual MCS table according to the channel quality information, and the actual MCS table used by the transmitting and receiving parties in the current transmission process (for the convenience of description, the actual MCS table is hereinafter referred to as For the actual MCS table), specifically include:
  • the virtual MCS table is divided into a plurality of sub-tables of equal length; the base station and the mobile station find a corresponding MCS level on the virtual MCS table according to the channel quality information, and use the sub-table in which the MCS level is located as the actual used by the transmitting and receiving parties. MCS table.
  • the base station finally determines the actual MCS level used in the current transmission according to the channel quality information fed back by the mobile station and the MCS determination criterion, and the base station calculates the index value (or offset value) of the actual MCS level in the actual MCS table, and indexes the index.
  • the value (or offset value) is notified to the mobile station as part of the downlink transmission control information.
  • the mobile station obtains an index value (or an offset value) of the actual MCS level in the actual MCS table from the downlink transmission control information sent by the base station, and the MCS corresponding to the index value (or the offset value) is used by the base station to transmit the downlink.
  • the MCS used by the data The mobile station uses the MCS and other control information to demodulate the downlink data.
  • the actual MCS table in Application Example 1 is selected from the virtual MCS table by the method shown in FIG. 2:
  • the virtual MCS table is as shown in Table 1, wherein when the spectrum efficiency mprl ⁇ MPR ⁇ mpr2, the modulation order is orthogonal. phase shift keying QPSK, mpr2 MPR ⁇ mpr3 when preclude the use of 16-quadrature amplitude modulation 16QAM, mpr3 ⁇ MPR ⁇ 4 when mpr4 carry preclude the use of 64-quadrature amplitude modulation 64QAM, mprl 3 ⁇ 4 mpr2, mpr3, mpr4 are positive Real number, JL mprl ⁇ mpr2 ⁇ mpr3 ⁇ mpr4.
  • the corresponding values of mprl, mpr2, mpr3, and mpr4 are 0.2, 1.4, 2.6, and 5.6;
  • the CQI table is shown in Table 2, and the CQI table is established by the spectrum efficiency and the virtual MCS table.
  • one CQI value corresponds to one MCS level in the virtual MCS table.
  • the virtual MCS table is divided into several sub-tables of equal length, which are divided into four sub-tables as shown in FIG. 2, and each sub-table has 16 entries (MCS level).
  • the base station and the mobile station find a corresponding MCS level on the virtual MCS table according to the channel quality information CQI, and use the MCS
  • the sub-table of the level is used as the actual MCS table used by the transmitting and receiving parties.
  • the CQI level is 7
  • the MPR is 1.4766
  • the corresponding MCS level is 23
  • the selected MCS sub-table is sub-table 2.
  • the base station finally determines that the actual MCS level used in the current transmission is 21 according to the channel quality information and the scheduling criteria fed back by the mobile station, and the base station calculates the index value Index of the actual MCS level in the actual MCS table to be 5, which is represented by binary as 0101.
  • the base station notifies the mobile station of the index value Index as part of the downlink transmission control information.
  • the mobile station obtains the actual MCS level index value Index 0101 from the downlink transmission control information sent by the base station, and obtains the MCS corresponding to the index value in the actual MCS table, where the MCS is the MCS used by the base station to transmit downlink data.
  • the mobile station uses the MCS and other control information to demodulate the downlink data.
  • the specific process of the adaptive code modulation method in the application example 2 is as shown in FIG. 1 , which includes: the mobile station obtains local channel quality information through channel measurement, and feeds back to the base station, and the channel quality information that the mobile station feeds back to the base station may be
  • the signal-to-noise ratio (SNR) information may also be channel quality indicator (CQI) information or the like.
  • the base station and the mobile station select a part of the appropriate MCS level in the virtual MCS table according to the channel quality information to form an actual MCS table used by the transmitting and receiving parties in the data transmission process, which specifically includes: the sending and receiving parties find the channel quality information in the virtual MCS table.
  • the MCS level Based on the MCS level, a certain number of MCS levels are selected before and after (or only forward, or only backward) to form an actual MCS table.
  • the selected MCS level may be continuously distributed or non-continuously distributed, but the transmitting and receiving parties must select according to the same criteria to ensure that the same actual MCS table is used; the base station determines according to the channel quality information and MCS fed back by the mobile station. The criteria and other factors finally determine the actual MCS level used in this transmission.
  • the base station calculates the index value (or offset value) of the actual MCS level in the actual MCS table, and uses this index value (or offset value) as the downlink transmission control information. Part of the content, notified to the mobile station
  • the mobile station obtains an index value (or an offset value) of the actual MCS level in the actual MCS table from the downlink transmission control information sent by the base station, and the MCS corresponding to the index value (or the offset value) is
  • the base station is used to transmit the MCS used for downlink data.
  • the mobile station demodulates the downlink data using the MCS and other control information.
  • the actual MCS table in Application Example 2 is selected from the virtual MCS table by the method shown in Figure 3:
  • mprl, mpr2, mpr3, and mpr4 respectively have values of 0.2, 1.4, 2.6, and 5.6.
  • the CQI table is shown in Table 2.
  • the CQI table establishes a correspondence between the spectrum efficiency and the virtual MCS table, that is, a CQI.
  • the value corresponds to an MCS level in the virtual MCS table.
  • the transmitting and receiving parties find the MCS level corresponding to the channel quality information CQI in the virtual MCS table.
  • the CQI level is 7, and its MPR is 1.4766, and its corresponding MCS level is 23. Based on the 23rd MCS level, a certain number of MCS levels are selected before (or only forward, or only backward).
  • 16 MCS levels are selected to form the actual MCS table.
  • the selected MCS level may be continuously distributed or non-continuously distributed, but the transmitting and receiving parties must select according to the same criteria to ensure that the same actual MCS table is used; the offset index corresponding to the table is large.
  • the small to -15, -14..., -1, 0, can be represented by 0000 to 1111 lengths of 4 bits of 16 binary numbers from large to small.
  • the base station finally determines the actual MCS level used for this transmission to be 21 according to the channel quality information fed back by the mobile station and the MCS determination criteria.
  • the base station calculates the actual MCS level relative to the reference MCS level, and the offset value in the actual MCS table is -2, and the corresponding offset value index is expressed in binary as 1101, and the base station uses the offset value index as the downlink transmission control information. Part of the content, notified to the mobile station.
  • the mobile station obtains an offset value index 1101 between the actual MCS level and the reference MCS level between the actual MCS table from the downlink transmission control information delivered by the base station; the mobile station offsets the index corresponding to the index-2 with the reference MCS level 23 Adding the actual MCS level 21 corresponding to the actual MCS table, the MCS corresponding to the MCS level is the MCS used by the base station to transmit downlink data.
  • the mobile station uses the MCS and other control information to demodulate the downlink data.
  • the specific process of the adaptive code modulation method in the third application example is as shown in FIG. 1, and includes: The mobile station obtains local channel quality information through channel measurement, and feeds back to the base station, and the channel quality information that the mobile station feeds back to the base station may be signal to noise ratio (SNR) information or channel quality indication (CQI) information.
  • SNR signal to noise ratio
  • CQI channel quality indication
  • the base station and the mobile station select a part of the appropriate MCS level in the virtual MCS table according to the channel quality information to form an actual MCS table used by the transmitting and receiving parties in the data transmission process, and specifically include: the base station and the mobile station according to the full bandwidth CQI, in the virtual MCS Find the MCS sub-table corresponding to the full-bandwidth CQI on the table; then find the MCS level corresponding to the sub-band CQI in the MCS sub-table according to the sub-band CQI, and use this as the reference, before (or only forward, or only backward) Select a certain number of MCS levels to form the actual MCS table used by both senders and receivers.
  • the base station finally determines the actual MCS level used for this transmission based on the full bandwidth CQI, subband CQI, and MCS determination criteria fed back by the mobile station.
  • the base station calculates an index value (or offset value) of the actual MCS level in the actual MCS table, and notifies the mobile station of the index value (or offset value) as part of the downlink transmission control information.
  • the mobile station obtains an index value (or an offset value) of the actual MCS level in the actual MCS table from the downlink transmission control information sent by the base station, and the MCS corresponding to the index value (or the offset value) is used by the base station to transmit the downlink.
  • the MCS used by the data The mobile station uses the MCS and other control information to demodulate the downlink data.
  • the actual MCS table is selected from the virtual MCS table by the method shown in FIG. 4:
  • the virtual MCS table shown in Table 1 wherein when the spectrum efficiency mprl ⁇ MPR ⁇ mpr2, the modulation order is QPSK,
  • mpr2 ⁇ MPR ⁇ mpr3 use 16QAM
  • mpr3 ⁇ MPR ⁇ mpr4 use 64QAM
  • mprl, mpr2, mpr3, mpr4 are positive real numbers
  • mprl ⁇ mpr2 ⁇ mpr3 ⁇ mpr4 are positive real numbers
  • mprl, mpr2, mpr3, and mpr4 respectively have values of 0.2, 1.4, 2.6, and 5.6.
  • the CQI table is shown in Table 2.
  • the CQI table establishes a correspondence between the spectrum efficiency and the virtual MCS table.
  • a CQI value corresponds to an MCS level in the virtual MCS table.
  • the transmitting and receiving parties find the MCS level corresponding to the full bandwidth CQI on the virtual MCS table.
  • the full bandwidth CQI level is 6, the MPR is 1.1758, and the corresponding MCS level is 18.
  • a certain number of MCS levels are selected before and after (or only forward, or only backward).
  • 6 MCS levels are selected forward;
  • the MCS level corresponding to the sub-band CQI is found on the quasi-MCS table.
  • the sub-band CQI level is 10
  • the MPR is 2.7305
  • the corresponding MCS level is 39.
  • a certain number of MCS levels are selected before and after (or only forward, or only backward).
  • 10 MCS levels are selected forward; MCS table.
  • the base station finally determines the actual MCS level used for this transmission based on the full bandwidth CQI, subband CQI, and MCS determination criteria fed back by the mobile station.
  • the base station calculates an index value of the actual MCS level in the actual MCS table, and notifies the mobile station of the index value as part of the downlink transmission control information.
  • the mobile station obtains the actual MCS level from the downlink transmission control information sent by the base station in actual
  • the index value in the MCS table, the MCS corresponding to the index value in the actual MCS table is the MCS used by the base station to transmit downlink data.
  • the mobile station uses the MCS and other control information to demodulate the downlink data.
  • the specific process of the adaptive code modulation method in the application example 4 is as shown in FIG. 1 , which includes: the mobile station obtains local channel quality information through channel measurement, and feeds back to the base station, and the channel quality information that the mobile station feeds back to the base station may be
  • the signal-to-noise ratio (SNR) information may also be channel quality indicator (CQI) information or the like.
  • the base station and the mobile station select a suitable MCS level in the virtual MCS table according to the channel quality information to form an actual MCS table used by the transmitting and receiving parties in the data transmission process, which specifically includes: sending and receiving dual-issues to find channel quality information in the virtual MCS table.
  • Corresponding MCS level and based on this, select a certain number of first part MCS levels before and after (or only forward, or only backward); then the transmitting and receiving sides are equally spaced or approximately equally spaced in the rest of the virtual MCS table
  • the second part of the MCS level is selected to form the actual MCS table used by both the transmitting and receiving parties.
  • the base station finally determines the actual MCS level used for the current transmission according to factors such as channel quality information fed back by the mobile station and MCS determination criteria.
  • the base station calculates an index value (or an offset value) of the actual MCS level in the actual MCS table, and notifies the mobile station of the index value (or offset value) as part of the downlink transmission control information.
  • the mobile station obtains an index value (or an offset value) of the actual MCS level in the actual MCS table from the downlink transmission control information sent by the base station, and the MCS corresponding to the index value (or the offset value) is used by the base station to transmit the downlink.
  • the MCS used by the data The mobile station demodulates the downlink data using the MCS and other control information.
  • the actual MCS table is selected from the virtual MCS table by the method shown in FIG. 5:
  • the virtual MCS table shown in Table 1 wherein when the spectrum efficiency mprl ⁇ MPR ⁇ mpr2, the modulation order is QPSK, When mpr2 MPR ⁇ mpr3 is used, 16QAM, mpr3 ⁇ MPR ⁇ mpr4, 64QAM, mprl, mpr2, mpr3, mpr4 are all positive real numbers, and mprl ⁇ mpr2 ⁇ mpr3 ⁇ mpr4.
  • the corresponding values of mprl, mpr2, mpr3, and mpr4 are 0.2, 1.4, 2.6, and 5.6.
  • the CQI table is shown in Table 2.
  • the CQI table establishes a correspondence between the spectrum efficiency and the virtual MCS table. That is, one CQI value corresponds to one MCS level in the virtual MCS table.
  • the transmitting and receiving parties find the channel quality information CQI corresponding MCS level in the virtual MCS table.
  • the CQI level is 7
  • its MPR is 1.4766
  • its corresponding MCS level is 23.
  • Partially take 4 groups of 8 MCS levels in actual application, the number of MCS levels included in each group is not necessarily equal, as long as the sending and receiving parties agree on the same rules), for example, the virtual MCS level is 0, 1 .
  • the base station finally determines the actual MCS level used for the transmission according to the channel quality information fed back by the mobile station and the MCS determination criteria.
  • the base station calculates the index value of the actual MCS level in the actual MCS table, and notifies the mobile station of the index value as part of the downlink transmission control information.
  • the mobile station obtains the actual MCS level from the downlink transmission control information sent by the base station in actual
  • the index value in the MCS table, the MCS corresponding to the index value in the actual MCS table is the MCS used by the base station to transmit downlink data.
  • the mobile station demodulates the downlink data using the MCS and other control information.
  • the technical solution of the present invention proposes to use a virtual MCS table to select a MCS table that is actually used in a granular MCS table to achieve an improvement in MCS selection accuracy without increasing control signaling overhead. Effect; Compared with the prior art, when the MCS table of the same granularity is used, the control signaling overhead in the present invention is reduced.

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Description

一种自适应编码调制方法 技术领域
本发明涉及通信领域， 特别涉及一种自适应编码调制方法。 背景技术
在移动通信系统里 , 自适应编码调制 ( adaptive modulation and coding, AMC ) 的基本原理就是根据无线信道变化选择合适的调制和编码集（MCS, Modulation and Coding Scheme ) , 基站侧根据用户瞬时信道质量状况和目前 资源选择最合适的下行链路调制和编码方式。
3GPP ( Third Generation Partnership Projects,第三代伙伴组织计划） LTE ( Long Term Evolution,长期演进 )以及 Wimax( Worldwide Interoperability for Microwave Access, 全球微波互联接入）等系统使用自适应编码调制（ AMC ) 方案来代替功率控制 （PC ) , 充分地利用了基站的发射功率， 这样做的结果 是： 处于有利位置的用户在信道条件好时充分利用系统资源提高传输速率， 而在信道条件差时又不提高功率， 不会增加对其他用户和小区的干扰。
AMC 利用衰落信道在相关衰落之间信道特性不变， 通过对当前信道质 量的测量， 实时改变系统的编码调制方式使系统的吞吐量达到最大。 一个完 整的 AMC过程可以描述如下：
首先基站 A向移动台 B发射一个用于信道测量的信号， 移动台 B根据 接收到的信号测算出当前时刻的信道质量； 接着移动台 B依据一定的方式将 当前时刻的信道质量上报给基站 A; 最后， 基站 A根据此信道质量报告选择 合适的编码调制方式向移动台 B发送数据。 其中， 频谱效率， 即调制阶数码 率积（ Modulation order Product code Rate, 简称为 MPR )是由信道质量决定 的， 信道质量越好， MPR值越高， 信道质量越差， MPR值越低。
移动台向基站上 4艮的信道质量信息可以是信噪比 （signal to noise rate, SNR )信息， 也可以是信道质量指示 （channel quality indicator, CQI )信息 等。 CQI是一种量化的信噪比， 移动台根据在特定的参考时隙的时间间隔内 反馈的 CQI, 需要保证传输块差错概率要小于某一特定值（例如在 3GPP中 差错概率要小于 10% ) , 每一个 CQI值都有唯一的一个编码调制方式 MCS 和一定范围的 SNR区间与之对应， 当 CQI值从小到大变化时， 对应的 MCS 等级也会从小到大发生变化。 在 3GPP系统中， 移动台向基站上报的 CQI有 两种形式， 一种是全带宽的 CQI, 用于反映整个带宽上的信道质量； 另外一 种是子带 CQI (sub-band CQI), 用于反映在某些特定频带上的信道质量， 例 如 best— M CQI反馈的就是最好的 M个子频带上的信道质量； 全带宽 CQI 的反馈周期通常比子带 CQI的要长， 子带 CQI通常釆用差分 CQI的形式上 报给基站。
下行传输控制信息是指基站用以告知移动台下行传输数据格式的信令， 一般来说下行传输控制信息包括了 MCS信息、 物理资源指示信息或传输块 大小信息以及功控信息等等。
MCS表的颗粒度越细， 可供选择的编码调制方式越多， AMC的方式越 灵活。 但是， 增加 MCS表的颗粒度会增加信令的开销， 例如 16级的 MCS 表需要 4比特的信令来表示，而 64级的 MCS表则需要 6比特的信令来表示， 对于控制信道来说， 由于其频谱资源非常有限， 因此要尽量压缩信令开销。 例如 HSDPA ( High Speed Downlink Packet Access,表示高速下行分组接入技 术） 系统釆用的是 32级的 MCS表， 用 5比特的信令来表示； 而 Wimax系 统釆用的是 11级的 MCS表， 用 4比特的信令来表示。 发明内容
本发明要解决的技术问题是针对现有技术存在的缺陷， 提供一种新的自 适应编码调制方法， 既能减少控制信令的开销， 又能提高 MCS选择的精度。
为了解决上述问题， 本发明提供了一种自适应编码调制方法， 包括： 基站和移动台在本地预存虚拟调制和编码集 MCS表， 每次数据传输前， 基站和移动台从所述虚拟 MCS表中选择包含当前信道质量信息 CQI对应的 MCS等级在内的若干 MCS等级， 作为本次传输中实际的 MCS表；
基站从所述实际的 MCS表中为所述移动台选择本次传输所用 MCS等 级， 并发送携带有本次传输 MCS信息的下行传输控制信息给所述移动台； 所述本次传输 MCS信息用于指示本次传输所用 MCS等级在所述实际的 MCS 表中的位置信息；
移动台接收所述的下行传输控制信息后， 根据其中的所述 MCS信息和 所述实际的 MCS表， 获知基站所用 MCS。
进一步的， 基站和移动台从所述虚拟 MCS表中选择包含当前 CQI对应 的 MCS等级在内的若干 MCS等级作为本次传输中实际的 MCS表的方法包 括：
基站和移动台将所述虚拟 MCS表分成若干个长度相等的子表， 基站和 移动台在所述虚拟 MCS表中找到与所述当前 CQI相对应的 MCS等级，将该 MCS等级所在的子表作为本次传输中实际的 MCS表。
进一步的， 基站和移动台从所述虚拟 MCS表中选择包含当前 CQI对应 的 MCS等级在内的若干 MCS等级作为本次传输中实际的 MCS表的方法包 括：
基站和移动台在所述虚拟 MCS表中找到所述当前 CQI对应的 MCS等 级， 并以此 MCS等级为基准， 向前和 /或向后选取若干 MCS等级，作为本次 传输中实际的 MCS表。
进一步的， 基站和移动台从所述虚拟 MCS表中选择包含当前 CQI对应 的 MCS等级在内的若干 MCS等级作为本次传输中实际的 MCS表的方法包 括：
基站和移动台根据当前全带宽 CQI在所述虚拟 MCS表中找到所述全带 宽 CQI对应的 MCS等级， 并以所述全带宽 CQI对应的 MCS等级为基准， 向前和 /或向后选取若干 MCS等级，作为第一部分 MCS等级；根据当前子带 CQI在虚拟 MCS表中找到所述子带 CQI对应的 MCS等级， 并以所述子带 CQI对应的 MCS等级为基准，向前和 /或向后选取若干 MCS等级，作为第二 部分 MCS等级； 所选取的第一部分 MCS等级和第二部分 MCS等级共同组 成本次传输中实际的 MCS表。
进一步的， 基站和移动台从所述虚拟 MCS表中选择包含当前 CQI对应 的 MCS等级在内的若干 MCS等级作为本次传输中实际的 MCS表的方法包 括： 基站和移动台在虚拟 MCS表中找到所述当前 CQI对应的 MCS等级，并 以所述当前 CQI对应的 MCS等级为基准， 向前和 /或向后选取若干 MCS等 级作为第一部分 MCS等级； 然后在虚拟 MCS表的其余部分选取若干 MCS 等级组第二部分 MCS等级， 所选取的第一部分 MCS等级和第二部分 MCS 等级共同组成本次传输中实际的 MCS表。
进一步的，所述本次传输 MCS信息为本次传输所用 MCS等级在本次传 输中实际的 MCS表中的索引值。
进一步的，移动台根据所述 MCS信息和所述实际的 MCS表获知基站所 用 MCS的所述方法包括：
移动台从基站下发的下行传输控制信息中获取本次传输所用 MCS等级 在本次传输中实际的 MCS表中的索引值，所述索引值所对应的 MCS即为基 站用于传输下行数据所使用的 MCS。
进一步的，所述本次传输 MCS信息为本次传输所用 MCS等级在本次传 输中实际的 MCS表中相对于基准 MCS等级的偏移值； 所述偏移值为实际 MCS等级与基准 MCS等级之差，或为基准 MCS等级与实际 MCS等级之差； 所述基准 MCS等级为所述虚拟 MCS表中与当前 CQI对应的 MCS等级。 进一步的，移动台根据所述 MCS信息和所述实际的 MCS表获知基站所 用 MCS的所述方法包括：
移动台从基站下发的下行传输控制信息中获取本次传输所用 MCS等级 在本次传输中实际使用的 MCS表中相对于基准 MCS等级的偏移值；
当所述偏移值为实际 MCS等级与基准 MCS等级之差时，移动台用所述 偏移值与基准 MCS等级相加得到在本次传输中实际的 MCS表中本次传输所 用 MCS等级， 所得到的 MCS等级对应的 MCS即为基站用于传输下行数据 所使用的 MCS;
当所述偏移值为基准 MCS等级与实际 MCS等级之差时，移动台用基准
MCS等级减去所述偏移值， 得到在本次传输中实际的 MCS表中本次传输所 用 MCS等级， 所得到的 MCS等级对应的 MCS即为基站用于传输下行数据 所使用的 MCS。 进一步的， 每次数据传输前， 所述方法还包括：
基站向移动台发射一个用于信道测量的信号， 移动台通过信道测量， 获 得当前时刻的 CQI, 并发送给基站。
本发明的技术方案提出了使用虚拟 MCS表， 通过在颗粒度较细的虚拟 MCS表中选择实际使用的 MCS表， 达到提高 MCS选择的精度的同时， 不 增加控制信令开销的技术效果； 与现有技术相比， 使用同等颗粒度的 MCS 表时， 本发明中控制信令开销减少。 附图说明
图 1为自适应编码调制方法具体实施流程图；
图 2 为本发明应用示例一中实际使用的 MCS表产生示意图；
图 3 为本发明应用示例二中实际使用的 MCS表产生示意图；
图 4 为本发明应用示例三中实际使用的 MCS表产生示意图；
图 5 为本发明应用示例四中实际使用的 MCS表产生示意图。 具体实施方式
下面将结合附图及实施例对本发明的技术方案进行更详细的说明。
本发明的主要思想是： 在收发两端预存一张颗粒度较细的虚拟 MCS表， 在每次数据传输前， 收发双方按照相同的预先定义好的规则从虚拟 MCS表 中选择本次传输中实际的 MCS表。 同现有技术相比， 本发明既减少了控制 信令的开销， 又提高了 MCS选择的精度。 所谓虚拟 MCS表， 是指基站和移 动台预先设置的一张颗粒度较细， 包含较多等级（例如 32 级或 64 级） 的 MCS表， 并不直接使用于产生下行传输格式； 实际传输时使用的 MCS表是 从虚拟 MCS表中挑选出来的， 是虚拟 MCS表的一个子表。
本发明提供了一种自适应编码调制方法， 包括：
基站和移动台在本地预存虚拟 MCS表，每次传输前从所述虚拟 MCS表 中选择包含当前 CQI对应的 MCS等级在内的若干 MCS等级，作为本次传输 中实际的 MCS表； 其中， 移动台和基站获知当前 CQI的方法可以同现有技 术， 即： 基站向移动台发射一个用于信道测量的信号， 移动台通过信道测量， 获得当前时刻的信道质量信息， 并发送给基站。
基站从所述实际的 MCS表中为所述移动台 （也就是上报所述当前 CQI 的移动台）选择本次传输所用 MCS等级， 并发送携带有本次传输 MCS信息 的下行传输控制信息给所述的移动台， 还可以一并发送本次传输的数据； 所 述本次传输 MCS信息用于指示本次传输所用 MCS等级在所述实际的 MCS 表中的位置信息， 如在所述实际使用的 MCS表中的位置索引， 或是对于当 前 CQI对应的 MCS等级的位置偏移量等；
移动台接收所述的下行传输控制信息后， 根据其中的 MCS信息和所述 实际的 MCS表， 获知基站用于传输下行数据所用 MCS; 如果基站一并发送 了数据，移动台可以在获知基站用于传输下行数据所用 MCS后，使用该 MCS 和其它下行传输控制信息解调下行数据。
其中，移动台向基站反馈的信道质量信息，可以是信噪比（signal to noise rate, SNR )信息， 也可以是信道质量指示 （ channel quality indicator, CQI ) 信息等。
需要指出的是， 移动台和基站虽然是分别选择 MCS等级作为本次传输 中实际的 MCS表， 但选择方法相同， 因此所得到的本次传输中实际的 MCS 表是完全相同的。
其中， 移动台和基站在虚拟 MCS表中选择包含当前信道质量信息对应 的 MCS等级在内的若干 MCS等级作为本次传输中实际的 MCS表的方法， 方法一： 移动台和基站将虚拟 MCS表分成若干个长度相等的子表； 基 站和移动台根据所述当前 CQI, 在虚拟 MCS表中找到与所述当前 CQI相对 应的 MCS等级，将该 MCS等级所在的子表作为本次传输中实际的 MCS表； 方法二： 移动台和基站在虚拟 MCS表中找到所述当前 CQI对应的 MCS 等级， 并以此为基准， 前后（或仅向前， 或仅向后）各选取一定数目的 MCS 等级， 作为本次传输中实际的 MCS表； 需要说明的是， 所选 MCS等级可以 是连续分布的， 也可以是非连续分布的， 但收发双方必须依据相同的准则进 行选取， 以保证使用的是同一张本次传输中实际使用的 MCS表； 方法三： 移动台和基站根据当前全带宽 CQI在虚拟 MCS表中找到该全 带宽 CQI对应的 MCS等级， 并以此为基准， 前后 （或仅向前， 或仅向后） 各选取一定数目的 MCS等级作为第一部分 MCS等级； 根据当前子带 CQI 在虚拟 MCS表中找到该子带 CQI对应的 MCS等级，并以此为基准，前后（或 仅向前， 或仅向后）各选取一定数目的 MCS等级作为第二部分 MCS等级； 所选取的第一部分 MCS等级和第二部分 MCS等级共同组成本次传输中实际 的 MCS表； 所选 MCS等级可以是连续分布的， 也可以是非连续分布的， 但 收发双方必须依据相同的准则进行选取；
方法四：收发双方在虚拟 MCS表中找到所述当前 CQI对应的 MCS等级， 并以此为基准， 前后 （或仅向前， 或仅向后）各选取一定数目的 MCS等级 作为第一部分 MCS等级； 然后收发双方等间隔或近似等间隔地（实际应用 时， 不等间隔的选择也是可以的， 只要按收发双方约定好的选择规则来选择 即可 )从虚拟 MCS表的其余位置中选取若干组第二部分 MCS等级， 所选取 的第一部分 MCS等级和第二部分 MCS等级共同组成本次传输中实际的 MCS 表。
方法三、 四中的 "第一部分" 、 "第二部分" 仅为区分不同方式选择出 的 MCS等级， 不起限定作用。
通常， 选取出来的 MCS等级如果为连续的， 则按照原先的位置排列， 如果为不连续的， 则按从低到高的顺序排列； 当然实际应用时也不排除按别 的方式排列， 只要保证收发双方所得到的实际 MCS表相同即可。
(在后文中为叙述简便， 将虚拟 MCS表中与当前信道质量信息对应的 MCS等级称为基准 MCS等级。 )
此外， 还需要说明的是， 在选择本次传输中实际的 MCS表的过程中， 也可以将信道质量信息和 ACK/NACK信息综合考虑来选择合适的本次传输 中实际的 MCS表； 或者， 也可以将信道质量信息和调度方式（如持续调度， 半持续调度或动态调度 M言息综合考虑来选择合适的本次传输中实际的 MCS 表； 或者也可以将信道质量信息和小区用户 （如边缘小区用户或非边缘小区 用户）信息综合考虑来选择本次传输中实际的 MCS表； 其中， 基站确定本次传输所用 MCS等级， 并发送携带有 MCS信息的下 行传输控制信息给移动台具体可以包括：
基站根据移动台反馈的信道质量信息以及 MCS确定准则 （即特定的调 度算法）等因素最终确定本次传输所用 MCS等级（为叙述简便， 后文将该 MCS等级称为实际 MCS等级） ， 可以根据现有技术中的方式确定；
基站计算实际 MCS等级在本次传输中实际的 MCS表中的索引值，或计 算实际 MCS等级在本次传输中实际的 MCS表中相对于基准 MCS等级的偏 移值， 并将所述索引值或偏移值作为下行传输控制信息中的 MCS信息部分 的内容， 通知给移动台。 所述偏移值可以为实际 MCS等级与基准 MCS等级 之差， 也可以为基准 MCS等级与实际 MCS等级之差。
其中， 移动台根据接收到的下行传输控制信息和所述实际的 MCS表， 获知基站用于传输下行数据所用 MCS具体可以包括：
移动台从基站下发的下行传输控制信息中获取实际 MCS等级在本次传 输中实际的 MCS表中的索引值，该索引值所对应的 MCS即为基站用于传输 下行数据所使用的 MCS;
或移动台从基站下发的下行传输控制信息中获取实际 MCS等级在本次 传输中实际的 MCS表中相对于基准 MCS等级的偏移值，用该偏移值与基准 MCS等级相加（当偏移值为实际 MCS等级与基准 MCS等级之差时）或用 基准 MCS等级减去偏移值 (当偏移值为基准 MCS等级与实际 MCS等级之 差时）得到在本次传输中实际的 MCS表中对应的实际 MCS, 该 MCS即为 基站用于传输下行数据所使用的 MCS。 釆用哪种差值作为偏移值， 由移动台 和基站约定好。
下面用本发明的四个应用示例进一步加以说明。
应用示例一中自适应编码调制方法的具体过程如图 1所示， 包括： 移动台通过信道测量， 获得本地的下行信道质量信息， 并反馈给基站， 移动台向基站反馈的信道质量信息， 可以是信噪比 （SNR )信息， 也可以是 信道质量指示 （CQI )信息等。 基站和移动台根据上述信道质量信息， 在虚拟 MCS表中选择部分合适 的 MCS等级组成数据本次传输过程中收发双方所用的实际的 MCS表（为叙 述简便， 后文将该实际的 MCS表称为实际 MCS表） ， 具体包括：
将虚拟 MCS表分成若干个等长度的子表； 基站和移动台根据信道质量 信息， 在虚拟 MCS表上找到相对应的 MCS等级， 并使用该 MCS等级所在 的子表作为收发双方所用的实际的 MCS表。
基站根据移动台反馈的信道质量信息以及 MCS确定准则等因素最终确 定本次传输使用的实际 MCS等级， 基站计算实际 MCS等级在实际 MCS表 中的索引值（或偏移值） ， 并将此索引值（或偏移值）作为下行传输控制信 息的一部分内容， 通知给移动台。
移动台从基站下发的下行传输控制信息中获取实际 MCS 等级在实际 MCS表中的索引值（或偏移值） ， 该索引值（或偏移值）对应的 MCS即为 基站用于传输下行数据所使用的 MCS。 移动台使用所述的 MCS和其它控制 信息解调下行数据。
应用示例一中的实际 MCS表通过图 2所示方法从虚拟 MCS表中选取： 例如，虚拟 MCS表如表 1所示，其中当频谱效率 mprl < MPR<mpr2时， 调制阶数釆用正交相移键控 QPSK, mpr2 MPR<mpr3的时候釆用 16阶正交 幅度调制 16QAM , mpr3 < MPR<mpr4 的时 4矣釆用 64 阶正交幅度调制 64QAM, mprl ¾ mpr2、 mpr3、 mpr4都是正实数, JL mprl < mpr2 < mpr3 < mpr4。 在表 1所示的虚拟 MCS表中， mprl、 mpr2、 mpr3、 mpr4 分别对应 的取值为 0.2 , 1.4 , 2.6 , 5.6; CQI表如表 2所示， CQI表通过频谱效率同虚 拟 MCS表建立起对应关系， 即一个 CQI值对应虚拟 MCS表中一个 MCS等 级。
表 1、 虚拟 MCS表
Figure imgf000011_0001
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Figure imgf000012_0001
47 6 0.6064
48 6 0.6256
49 6 0.6449
50 6 0.6641
51 6 0.6833
52 6 0.7026
53 6 0.7218
54 6 0.7410
55 6 0.7602
56 6 0.7795
57 6 0.7987
58 6 0.8179
59 6 0.8372
60 6 0.8564
61 6 0.8756
62 6 0.8949
63 6 0.9141 表 2、 CQI表
Figure imgf000013_0001
本应用示例中， 将虚拟 MCS表分成若干个等长度的子表， 如图 2所示 分为 4个子表， 每个子表有 16个条目 （MCS等级） 。 基站和移动台根据信 道质量信息 CQI, 在虚拟 MCS表上找到对应的 MCS等级， 并使用该 MCS 等级所在子表作为收发双方所用的实际的 MCS表， 如图 2所示， CQI等级 为 7, 其 MPR为 1.4766, 其对应的 MCS等级为 23 , 选中的 MCS子表为子 表 2。
基站根据移动台反馈的信道质量信息以及调度准则等因素最终确定本次 传输使用的实际 MCS等级为 21 , 基站计算实际 MCS等级在实际 MCS表中 的索引值 Index为 5, 用二进制表示为 0101 , 基站将此索引值 Index作为下 行传输控制信息的一部分内容， 通知给移动台。
移动台从基站下发的下行传输控制信息中获取实际 MCS 等级索引值 Index为 0101 , 在实际 MCS表中获取该索引值对应的 MCS, 该 MCS即为基 站用于传输下行数据所使用的 MCS。 移动台使用所述的 MCS和其它控制信 息解调下行数据。
应用示例二中自适应编码调制方法的具体过程如图 1所示， 包括： 移动台通过信道测量， 获得本地的信道质量信息， 并反馈给基站， 移动 台向基站反馈的信道质量信息， 可以是信噪比 （SNR )信息， 也可以是信道 质量指示 （CQI )信息等。
基站和移动台根据上述信道质量信息， 在虚拟 MCS表中选择部分合适 的 MCS等级组成数据传输过程中收发双方所用的实际的 MCS表，具体包括： 收发双方在虚拟 MCS表中找到信道质量信息对应的 MCS等级，并以此 为基准， 前后 （或仅向前， 或仅向后）各选取一定数目的 MCS等级， 组成 实际 MCS表。 所选 MCS等级可以是连续分布的， 也可以非连续分布， 但收 发双方必须依据相同的准则进行选取， 以保证使用的是同一张实际 MCS表； 基站根据移动台反馈的信道质量信息以及 MCS确定准则等因素最终确 定本次传输使用的实际 MCS等级， 基站计算实际 MCS等级在实际 MCS表 中的索引值（或偏移值） ， 并将此索引值（或偏移值）作为下行传输控制信 息的一部分内容， 通知给移动台。
移动台从基站下发的下行传输控制信息中获取实际 MCS 等级在实际 MCS表中的索引值（或偏移值） ， 该索引值（或偏移值）对应的 MCS即为 基站用于传输下行数据所使用的 MCS。 移动台使用所述的 MCS和其它控制 信息解调下行数据。
应用示例二中实际 MCS表通过图 3所示方法从虚拟 MCS表中选取： 例如 , 表 1所示的虚拟 MCS表， 其中当频谱效率 mprl < MPR<mpr2调 制阶数釆用 QPSK , mpr2 < MPR<mpr3 的时 4昊釆用 16QAM , mpr3 < MPR<mpr4的时 4昊釆用 64QAM, mprl , mpr2、 mpr3、 mpr4都是正实数， 且 mprl < mpr2 < mpr3 < mpr4„ 在表 1所示的虚拟 MCS表中 , mprl、 mpr2、 mpr3、 mpr4 分别对应的取值为 0.2, 1.4, 2.6, 5.6; CQI表如表 2所示， CQI 表通过频谱效率同虚拟 MCS 表建立起对应关系， 即一个 CQI值对应虚拟 MCS表中一个 MCS等级。
收发双方在虚拟 MCS表中找到信道质量信息 CQI对应的 MCS等级，如 图 3所示， CQI等级为 7, 其 MPR为 1.4766, 其对应的 MCS等级为 23。 以 第 23 级 MCS等级为基准， 前后（或仅向前， 或仅向后）各选取一定数目的 MCS等级， 如图 3所示， 向前选取 16个 MCS等级， 组成实际 MCS表。 所 选 MCS等级可以是连续分布的， 也可以是非连续分布的， 但收发双方必须 依据相同的准则进行选取， 以保证使用的是同一张实际 MCS表； 该表所对 应的偏移值索引由大到小分别为 -15 , -14…，- 1 , 0, 可用 0000到 1111长度为 4比特的 16个二进制数由大到小表示。
基站根据移动台反馈的信道质量信息以及 MCS确定准则等因素最终确 定本次传输使用的实际 MCS等级为 21级。 基站计算实际 MCS等级相对于 基准 MCS等级， 在实际 MCS表中的偏移值为 -2, 其对应的偏移值索引用二 进制表示为 1101 , 基站将此偏移值索引作为下行传输控制信息的一部分内 容， 通知给移动台。
移动台从基站下发的下行传输控制信息中获取实际 MCS 等级与基准 MCS等级在实际 MCS表之间的偏移值索引 1101 ; 移动台将该索引对应的偏 移值 -2与基准 MCS等级 23相加得到在实际 MCS表中对应的实际 MCS等级 21 , 该 MCS等级对应的 MCS即为基站用于传输下行数据所使用的 MCS。 移动台使用所述的 MCS和其它控制信息解调下行数据。
应用示例三中自适应编码调制方法的具体过程如图 1所示， 包括： 移动台通过信道测量， 获得本地的信道质量信息， 并反馈给基站， 移动 台向基站反馈的信道质量信息， 可以是信噪比 （SNR )信息， 也可以是信道 质量指示 （CQI )信息等。
基站和移动台根据上述信道质量信息， 在虚拟 MCS表中选择部分合适 的 MCS等级组成数据传输过程中收发双方所用的实际的 MCS表，具体包括： 基站和移动台根据全带宽 CQI ,在虚拟 MCS表上找到全带宽 CQI对应 的 MCS子表； 然后根据子带 CQI在 MCS子表中找到子带 CQI对应的 MCS 等级， 并以此为基准， 前后（或仅向前， 或仅向后）各选取一定数目的 MCS 等级， 组成收发双方所用的实际的 MCS表。
基站根据移动台反馈的全带宽 CQI、 子带 CQI以及 MCS确定准则等因 素最终确定本次传输使用的实际 MCS等级。基站计算实际 MCS等级在实际 MCS表中的索引值（或偏移值） ， 并将此索引值（或偏移值）作为下行传输 控制信息的一部分内容， 通知给移动台。
移动台从基站下发的下行传输控制信息中获取实际 MCS 等级在实际 MCS表中的索引值（或偏移值） ， 该索引值（或偏移值）对应的 MCS即为 基站用于传输下行数据所使用的 MCS。 移动台使用所述的 MCS和其它控制 信息解调下行数据。
应用示例三中， 实际 MCS表通过图 4所示方法从虚拟 MCS表中选取： 例如，表 1所示的虚拟 MCS表，其中当频谱效率 mprl < MPR<mpr2时， 调制阶数釆用 QPSK , mpr2 < MPR<mpr3 的时候釆用 16QAM , mpr3 < MPR<mpr4的时 4昊釆用 64QAM, mprl , mpr2、 mpr3、 mpr4都是正实数， 且 mprl < mpr2 < mpr3 < mpr4„ 在表 1所示的虚拟 MCS表中 , mprl、 mpr2、 mpr3、 mpr4 分别对应的取值为 0.2, 1.4, 2.6, 5.6,; CQI表如表 2所示， CQI 表通过频谱效率同虚拟 MCS 表建立起对应关系， 即一个 CQI值对应虚拟 MCS表中一个 MCS等级。
收发双方在虚拟 MCS表上找到全带宽 CQI相对应的 MCS等级； 如图 4 所示， 全带宽 CQI等级为 6, 其 MPR为 1.1758, 其对应的 MCS等级为 18。 以第 18级 MCS等级为基准， 前后（或仅向前， 或仅向后）各选取一定数目 的 MCS等级， 如图 4所示， 向前选取 6个 MCS等级； 然后， 收发双方在虚 拟 MCS表上找到子带 CQI相对应的 MCS等级； 如图 4所示， 子带 CQI等 级为 10, 其 MPR为 2.7305, 其对应的 MCS等级为 39。 以第 39级 MCS等 级为基准， 前后 （或仅向前， 或仅向后）各选取一定数目的 MCS等级， 如 图 4所示，向前选取 10个 MCS等级；共同组成收发双方所用的实际的 MCS 表。
基站根据移动台反馈的全带宽 CQI、 子带 CQI以及 MCS确定准则等因 素最终确定本次传输使用的实际 MCS等级。基站计算实际 MCS等级在实际 MCS表中的索引值， 并将此索引值作为下行传输控制信息的一部分内容， 通 知给移动台。
移动台从基站下发的下行传输控制信息中获取实际 MCS 等级在实际
MCS表中的索引值， 在实际 MCS表中与所述索引值相应的 MCS即为基站 用于传输下行数据所使用的 MCS。 移动台使用所述的 MCS和其它控制信息 解调下行数据。
应用示例四中自适应编码调制方法的具体过程如图 1所示， 包括： 移动台通过信道测量， 获得本地的信道质量信息， 并反馈给基站， 移动 台向基站反馈的信道质量信息， 可以是信噪比 （SNR )信息， 也可以是信道 质量指示 （CQI )信息等。
基站和移动台根据上述信道质量信息， 在虚拟 MCS表中选择部分合适 的 MCS等级组成数据传输过程中收发双方所用的实际的 MCS表，具体包括： 收发双发在虚拟 MCS表中找到信道质量信息对应的 MCS等级，并以此 为基准， 前后 （或仅向前， 或仅向后）各选取一定数目的第一部分 MCS等 级； 然后收发双方等间隔或近似等间隔地在虚拟 MCS表的其余位置中选取 若干组第二部分 MCS等级， 共同组成收发双方所用的实际的 MCS表。
基站根据移动台反馈的信道质量信息以及 MCS确定准则等因素最终确 定本次传输使用的实际 MCS等级。 基站计算实际 MCS等级在实际 MCS表 中的索引值（或偏移值） ， 并将此索引值（或偏移值）作为下行传输控制信 息的一部分内容， 通知给移动台。 移动台从基站下发的下行传输控制信息中获取实际 MCS 等级在实际 MCS表中的索引值（或偏移值） ， 该索引值（或偏移值）对应的 MCS即为 基站用于传输下行数据所使用的 MCS。 移动台使用所述的 MCS和其它控制 信息解调下行数据。
应用示例四中， 实际 MCS表通过图 5所示方法从虚拟 MCS表中选取： 例如，表 1所示的虚拟 MCS表，其中当频谱效率 mprl < MPR<mpr2时， 调制阶数釆用 QPSK, 当 mpr2 MPR<mpr3 的时 4昊釆用 16QAM, mpr3 < MPR<mpr4的时 4昊釆用 64QAM, mprl , mpr2、 mpr3、 mpr4都是正实数， 且 mprl < mpr2 < mpr3 < mpr4„ 在表 1所示的虚拟 MCS表中 , mprl、 mpr2、 mpr3、 mpr4 分别对应的取值为 0.2, 1.4, 2.6, 5.6; CQI表如表 2所示， CQI 表通过频谱效率同虚拟 MCS 表建立起对应关系， 即一个 CQI值对应虚拟 MCS表中一个 MCS等级。
收发双方在虚拟 MCS表中找到信道质量信息 CQI对应的 MCS等级，如 图 5所示， CQI等级为 7, 其 MPR为 1.4766, 其对应的 MCS等级为 23。 以 第 23 级 MCS等级为基准， 前后（或仅向前， 或仅向后）各选取一定数目的 MCS等级， 如图 5所示， 向前选取 8个 MCS等级； 然后在虚拟 MCS表上 其余部分均匀取 4组共 8个 MCS等级（实际应用时， 每组所包含的 MCS等 级的数量不一定相等， 只要收发双方约定好一样的规则即可） ， 例如取虚拟 MCS等级为 0, 1 , 40, 41 , 51 , 52, 62, 63的 MCS, 按虚拟 MCS等级由 低到高的顺序， 共同组成收发双发所用的实际的 MCS表。
基站根据移动台反馈的信道质量信息以及 MCS确定准则等因素最终确 定本次传输使用的实际 MCS等级。 基站计算实际 MCS等级在实际 MCS表 中的索引值， 并将此索引值作为下行传输控制信息的一部分内容， 通知给移 动台。
移动台从基站下发的下行传输控制信息中获取实际 MCS 等级在实际
MCS表中的索引值， 在实际 MCS表中与所述索引值相应的 MCS即为基站 用于传输下行数据所使用的 MCS。 移动台使用所述的 MCS和其它控制信息 解调下行数据。 需要指出， 以上所述的实施方式只是本发明的部分实施实例而已， 其中 虚拟 MCS表格并不限定于 64级， CQI表也不局限于 16级等某一特定情况,
Figure imgf000019_0001
而已， 并不局限于此。 在不违背本发明精神及实质的情况下， 技术人员可以 根据本发明产生其它实施例， 但这些基于本发明精神及实质的实施例也应该 属于本发明所附权利要求的保护范围之内。
工业实用性 本发明的技术方案提出了使用虚拟 MCS表， 通过在颗粒度较细的虚拟 MCS表中选择实际使用的 MCS表， 达到提高 MCS选择的精度的同时， 不 增加控制信令开销的技术效果； 与现有技术相比， 使用同等颗粒度的 MCS 表时， 本发明中控制信令开销减少。

Claims

权 利 要 求 书
1、 一种自适应编码调制方法， 所述方法包括：
基站和移动台均在本地预存虚拟调制和编码集 MCS表；
每次数据传输前， 基站和移动台从所述虚拟 MCS表中选择包含当前信 道质量信息 CQI对应的 MCS等级在内的若干 MCS等级，作为本次传输中实 际的 MCS表；
基站从所述实际的 MCS表中为所述移动台选择本次传输所用 MCS等 级， 并发送携带有本次传输 MCS信息的下行传输控制信息给所述移动台； 所述本次传输 MCS信息用于指示本次传输所用 MCS等级在所述实际的 MCS 表中的位置信息； 以及
移动台接收所述的下行传输控制信息后，根据其中的所述本次传输 MCS 信息和所述实际的 MCS表， 获知基站所用 MCS。
2、 如权利要求 1 所述的方法， 其中， 所述基站和移动台从所述虚拟 MCS表中选择包含当前 CQI对应的 MCS等级在内的若干 MCS等级作为本 次传输中实际的 MCS表的所述步骤包括：
所述基站和移动台将所述虚拟 MCS表分成若干个长度相等的子表， 所 述基站和移动台在所述虚拟 MCS表中找到所述当前 CQI对应的 MCS等级， 将所述当前 CQI对应的 MCS等级所在的子表作为本次传输中实际的 MCS 表。
3、 如权利要求 1 所述的方法， 其中， 所述基站和移动台从所述虚拟
MCS表中选择包含当前 CQI对应的 MCS等级在内的若干 MCS等级作为本 次传输中实际的 MCS表的所述步骤包括：
所述基站和移动台在所述虚拟 MCS表中找到所述当前 CQI对应的 MCS 等级， 并以所述当前 CQI对应的 MCS等级为基准， 向前和 /或向后选取若干 MCS等级， 作为本次传输中实际的 MCS表。
4、 如权利要求 1 所述的方法， 其中， 所述基站和移动台从所述虚拟 MCS表中选择包含当前 CQI对应的 MCS等级在内的若干 MCS等级作为本 次传输中实际的 MCS表的所述步骤包括：
所述基站和移动台根据当前全带宽 CQI在所述虚拟 MCS表中找到所述 当前全带宽 CQI对应的 MCS等级， 并以所述当前全带宽 CQI对应的 MCS 等级为基准， 向前和 /或向后选取若干 MCS等级， 作为第一部分 MCS等级； 所述基站和移动台根据当前子带 CQI在所述虚拟 MCS表中找到所述当 前子带 CQI对应的 MCS等级， 并以所述当前子带 CQI对应的 MCS等级为 基准， 向前和 /或向后选取若干 MCS等级， 作为第二部分 MCS等级；
所选取的第一部分 MCS等级和第二部分 MCS等级共同组成本次传输中 实际的 MCS表。
5、 如权利要求 1 所述的方法， 其中， 所述基站和移动台从所述虚拟 MCS表中选择包含当前 CQI对应的 MCS等级在内的若干 MCS等级作为本 次传输中实际的 MCS表的所述步骤包括：
所述基站和移动台在所述虚拟 MCS表中找到所述当前 CQI对应的 MCS 等级， 并以所述当前 CQI对应的 MCS等级为基准， 向前和 /或向后选取若干 MCS等级作为第一部分 MCS等级；
所述基站和移动台在所述虚拟 MCS表的其余部分选取若干 MCS等级作 为第二部分 MCS等级，
所选取的第一部分 MCS等级和第二部分 MCS等级共同组成本次传输中 实际的 MCS表。
6、 如权利要求 1到 5任一项所述的方法， 其中：
所述本次传输 MCS信息为本次传输所用 MCS等级在本次传输中实际的 MCS表中的索引值。
7、 如权利要求 6所述的方法， 其中， 移动台根据所述本次传输 MCS 信息和所述实际的 MCS表获知基站所用 MCS的所述步骤包括：
移动台从基站下发的下行传输控制信息中获取本次传输所用 MCS等级 在本次传输中实际的 MCS表中的索引值，所述索引值所对应的 MCS即为基 站用于传输下行数据所使用的 MCS。
8、 如权利要求 1到 5任一项所述的方法， 其中：
所述本次传输 MCS信息为本次传输所用 MCS等级在本次传输中实际的 MCS表中相对于基准 MCS等级的偏移值； 所述偏移值为实际 MCS等级与 基准 MCS等级之差， 或为基准 MCS等级与实际 MCS等级之差；
所述基准 MCS等级为所述虚拟 MCS表中当前 CQI对应的 MCS等级。
9、 如权利要求 8所述的方法， 其中， 移动台根据所述 MCS信息和所 述实际的 MCS表获知基站所用 MCS的所述步骤包括：
移动台从基站下发的下行传输控制信息中获取本次传输所用 MCS等级 在本次传输中实际使用的 MCS表中相对于所述基准 MCS等级的偏移值； 当所述偏移值为实际 MCS等级与基准 MCS等级之差时，移动台用所述 偏移值与基准 MCS等级相加得到在本次传输中实际的 MCS表中本次传输所 用 MCS等级， 所得到的 MCS等级所对应的 MCS即为基站用于传输下行数 据所使用的 MCS;
当所述偏移值为基准 MCS等级与实际 MCS等级之差时，移动台用基准
MCS等级减去所述偏移值， 得到在本次传输中实际的 MCS表中本次传输所 用 MCS等级， 所得到的 MCS等级所对应的 MCS即为基站用于传输下行数 据所使用的 MCS。
10、 如权利要求 1到 5任一项所述的方法，其中每次数据传输前，所述 方法还包括：
所述基站向所述移动台发射一个用于信道测量的信号， 所述移动台通过 信道测量， 获得当前时刻的 CQI, 并发送给所述基站。
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