WO2015143672A1 - Procédé et appareil de réglage adaptatif de liaison - Google Patents

Procédé et appareil de réglage adaptatif de liaison Download PDF

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Publication number
WO2015143672A1
WO2015143672A1 PCT/CN2014/074210 CN2014074210W WO2015143672A1 WO 2015143672 A1 WO2015143672 A1 WO 2015143672A1 CN 2014074210 W CN2014074210 W CN 2014074210W WO 2015143672 A1 WO2015143672 A1 WO 2015143672A1
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WIPO (PCT)
Prior art keywords
subframe
subframe set
subframes
link
interference
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Ceased
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PCT/CN2014/074210
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English (en)
Chinese (zh)
Inventor
朱伟
彭炳光
张涵
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201480000544.6A priority Critical patent/CN105229954B/zh
Priority to PCT/CN2014/074210 priority patent/WO2015143672A1/fr
Publication of WO2015143672A1 publication Critical patent/WO2015143672A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for link adaptive adjustment.
  • Link Adaptation becomes one of the key technologies of the mobile communication system.
  • the link adaptation technology refers to the channel state fed back by the receiving end in the communication network, and the encoding mode of the transmitting end. Techniques for adaptive adjustment of modulation type and transmit power.
  • the existing link adaptation technology sets a target value of the control parameter and the control parameter for the user, and then according to the difference between the measured value of the control parameter (the statistical value of a certain period of time) and the target expectation, the measurement signal and The Signal to Interference plus Noise Ratio (SINR), Modulation and Coding Scheme (MC S), and transmit power are adaptively corrected or adjusted to converge the measured value of the control parameter to the target value.
  • SINR Signal to Interference plus Noise Ratio
  • MC S Modulation and Coding Scheme
  • Adaptive Modulation and Coding can be used to control the user's block error rate in order to achieve the desired data transmission quality in different environments.
  • AMC Adaptive Modulation and Coding
  • Embodiments of the present invention provide a method and apparatus for link adaptive adjustment, which can improve system performance.
  • a base station including:
  • a classifying unit configured to divide a plurality of subframes in the link into M subframe sets, where the link is established by the base station and the terminal device, and each of the M subframe sets includes at least one subframe a frame, the M being an integer greater than or equal to 2;
  • a setting unit configured to separately set an adaptively adjusted control parameter and a target expectation of the control parameter for each of the M subframe sets divided by the classification unit;
  • an adjusting unit configured to perform link adaptation adjustment on each of the M subframe sets that are divided by the classification unit, so that the control parameter corresponding to each of the subframe sets after adjustment meets the control parameter The goal is expected.
  • the classifying unit is specifically configured to: divide a plurality of subframes in the link into an interference subframe set and a interference-free subframe set;
  • the interference subframe set includes all interfered subframes in the multiple subframes, and the interference-free subframe set includes all undisturbed subframes in the multiple subframes.
  • the classifying unit is specifically configured to: when the link is subjected to periodic interference, divide multiple subframes in the link into K subframe sets,
  • the interference period of the periodic interference is T milliseconds
  • the period interference duration is L milliseconds
  • 0 ⁇ L ⁇ T the period interference duration
  • K is an integer greater than or equal to 2
  • the M is equal to K;
  • the K subframe sets are the 0th subframe set to the (K-1) subframe set, and the subframes of (j/K+i)T to (j/K+l/K+i)T are divided.
  • the j is an integer, 0 j (K- l )
  • the i is an integer greater than or equal to 0.
  • the classification unit is specifically used When the sounding reference signal SRS subframe is included in the link, the multiple subframes in the link are divided into a first subframe set, a second subframe set, and a third subframe set, where the M Equal to 3;
  • the first subframe set includes all SRS subframes in the multiple subframes
  • the second subframe set includes a first subframe after each SRS subframe in the multiple subframes
  • the third subframe set includes all subframes of the plurality of subframes except the first subframe set and the second subframe set.
  • the setting unit is specifically configured to: set a error block rate to a control parameter of each subframe set;
  • the block error rate target value is set to a target value of the control parameter of each of the subframe sets, and the block error rate target values of each of the subframe sets are the same.
  • the link is an uplink
  • the adjustment unit includes an acquisition subunit, and the acquisition subunit is configured to acquire a statistic value of a block error rate of the first subframe set in the M subframe sets in the preset time period in the uplink;
  • the adjusting unit further includes a sending subunit, where the sending subunit is configured to send uplink grant signaling to the terminal device, where the uplink grant signaling includes the MC S order, so that the terminal device adopts the MCS
  • the order transmits data on the first set of subframes, and the terminal device establishes the uplink with the base station.
  • a second aspect provides a method for link adaptation, which is used by a base station, and includes: dividing a plurality of subframes in a link into M subframe sets, where the link is established by the base station and a terminal device, where Each of the M subframe sets includes at least one subframe, and the M is an integer greater than or equal to 2;
  • the M is equal to 2
  • the dividing the multiple subframes in the link into the M subframe sets includes:
  • the interference subframe set includes all interfered subframes in the multiple subframes, and the interference-free subframe set includes all undisturbed subframes in the multiple subframes.
  • the dividing the multiple subframes in the link into the M subframe sets includes:
  • the multiple subframes in the link are divided into K subframe sets, the interference period of the periodic interference is T milliseconds, and the periodic interference duration is L milliseconds. 0 ⁇ L ⁇ T , K is an integer greater than or equal to 2, and the M is equal to K;
  • the K subframe sets are the 0th subframe set to the (K-1) subframe set, and the subframes of (j/K+i)T to (j/K+l/K+i)T are divided.
  • the j is an integer, 0 j (K- l )
  • the i is an integer greater than or equal to 0.
  • the dividing the multiple subframes in the link into the M subframe sets includes:
  • the multiple subframes in the link are divided into a first subframe set, a second subframe set, and a third subframe set, where the M is equal to 3 ;
  • the first subframe set includes all SRS subframes in the multiple subframes
  • the second subframe set includes a first subframe after each SRS subframe in the multiple subframes
  • the third subframe set includes all subframes of the plurality of subframes except the first subframe set and the second subframe set.
  • the setting of the adaptively adjusted control parameter and the target requirement of the control parameter for each of the M subframe sets respectively includes:
  • the block error rate target value is set to a target expectation of the control parameter of each of the subframe sets, and the block error rate target values of each of the subframe sets are the same.
  • performing link adaptation adjustment on each of the M subframe sets includes:
  • the terminal device Transmitting uplink grant signaling to the terminal device, where the uplink grant signaling includes the MCS order, so that the terminal device uses the MC S order to transmit data on the first subframe set, where the terminal The device establishes the uplink with the base station.
  • the method and device for link adaptation adjustment provided by the embodiment of the present invention, when performing link adaptation adjustment, first classify multiple subframes in the link to obtain multiple subframe sets, and then for each subframe.
  • the set sets the adaptively adjusted control parameters and the target values of the control parameters, and performs link adaptation adjustment for each subframe set respectively.
  • the link adaptive technology control capability can be enhanced while Effectively improve system performance.
  • FIG. 1 is a schematic structural diagram of a radio frame in an LTE system according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for link adaptive adjustment according to an embodiment of the present invention
  • FIG. 3 is a flowchart of another method for link adaptive adjustment according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • LTE Long Term Evolution
  • ns is microseconds.
  • the baseband sampling rate 30.72MHz.
  • the radio frame of the LTE Frequency Division Duplex (FDD) system is taken as an example.
  • Each 10 msec radio frame of the LTE frequency division duplex system is divided into 20 time slots, each time. Gap length
  • the time slots are numbered in the order of 0 to 19, and two consecutive time slots labeled 2n and 2 ⁇ +1 can be combined into one subframe ⁇ , and ⁇ is an integer greater than or equal to 0 and less than or equal to 9, and the length of each subframe is 1 millisecond, the subframes can be numbered 0 to 9 in chronological order
  • the uplink and downlink of the LTE system can also be separated in the frequency domain, so that the resources available for downlink transmission and uplink transmission in each 10 msec interval are 10 subframes.
  • the structure of the radio frame is as shown in FIG. 1.
  • the length of the radio frame 01 is 10 milliseconds, and the radio frame 01 includes 20 time slots numbered from 0 to 19, and the time slots are as shown by 03 in FIG.
  • the length of the time slot is 0.5 milliseconds, and the 20 time slots included in the wireless frame 01 can form 10 subframes of length 1 millisecond.
  • the subframe is shown as 02 in FIG. 1 , and each subframe includes two time slots. .
  • the demodulation energy of different subframes The force is different, for example, the demodulation ability of the interfered sub-frame will be deteriorated.
  • the existing link adaptation technology does not consider the difference between the demodulation capabilities of different subframes.
  • the control parameters of different subframes in the prior art are exactly the same as the target values of the control parameters, and only adaptive adjustment is performed.
  • the mean value of all the subframes of the control parameter in the link can be converged to the target value, but the actual value of the control parameter in different subframes does not necessarily converge to the target value, thus affecting system performance.
  • An embodiment of the present invention provides a method for link adaptation, as shown in FIG. 2, for a base station, including:
  • Step 201 Divide a plurality of subframes in the link into M subframe sets, where the link is established by the base station and the terminal device, and each subframe set in the M subframe sets includes at least one subframe, where M is greater than or equal to 2. The integer.
  • the link is an uplink or downlink established between a base station and a terminal device, and the uplink or downlink is composed of consecutive frames, each frame consisting of a plurality of consecutive subframes, for example, In the LTE system, each frame is composed of 10 consecutive subframes. Therefore, when performing link adaptation adjustment, the base station may classify multiple subframes in the link to obtain M subframe sets, where M is greater than or An integer equal to 2.
  • Step 202 Set an adaptively adjusted control parameter and a target expectation of the control parameter for each of the M subframe sets.
  • the adaptively adjusted control parameters include one or a combination of a block error rate, a bit error rate, an average number of retransmissions, an average transmission delay, and an average spectral efficiency, and the control parameters can reflect the actual communication quality of the link.
  • the control parameter may also include other parameters of the existing link adaptation adjustment, which is not limited by the embodiment of the present invention.
  • the target expectation can be a specific value.
  • the target value of the block error rate can be set to 10%.
  • the target expectation can also be an optimization target, for example, when the adaptively adjusted control parameter is the average of the data transmission.
  • the target expectation of the control parameter may be such that the average spectral efficiency is maximized under the existing link quality.
  • the target expectation may also be a desired combination of multiple control parameters, such as an average retransmission. The average spectral efficiency is maximized if the number of times is less than one.
  • control parameters and target requirements of the control parameters may be set for different subframe sets.
  • the control parameter set for the first subframe set is a block error rate, and the target expectation of the control parameter is error.
  • the block rate is not more than 1%
  • the control parameter set for the second subframe set is the average spectral efficiency, and the target of the control parameter is expected to maximize the average spectral efficiency and the like.
  • Step 203 Perform link adaptation adjustment on each subframe set in the M subframe sets, so that the control parameters corresponding to each subframe set after adjustment meet the target expectation of the control parameter.
  • Performing link adaptive adjustment on each subframe set according to a control parameter of each subframe set of the M subframe sets and a target of the control parameter for example, adaptively adjusting a block error rate of the first subframe set, and setting
  • the target of the block error rate is expected to be 10%
  • the base station performs link adaptation adjustment on the first subframe set, so that the actual block error rate of the first subframe set converges to 10%.
  • the base station When performing link adaptation adjustment, the base station first classifies multiple subframes in the link to obtain a plurality of subframe sets, and sets target expectations of control parameters and control parameters for each subframe set, and then performs When the link is adaptively adjusted, link adaptation is performed for each subframe set separately, which can effectively improve the system performance while enhancing the link adaptive technology control capability.
  • multiple subframes in the link may be divided into two subframe sets, which are an interference subframe set and a non-interference subframe set respectively, where the interference subframe set includes multiple subframes.
  • the set of interference-free subframes includes all undisturbed subframes of the plurality of subframes.
  • the base station when classifying multiple subframes in a link, if the base station can predict The degree of interference of the subframe, or the base station may determine whether the subframe is interfered, and may divide the multiple subframes in the link into a set of interference subframes and a set of interference-free subframes according to whether the subframe receives interference, for example, assuming The first subframe is any one of the subframes.
  • the base station determines whether the first subframe is a victim subframe. If the first subframe is a victim subframe, the base station divides the first subframe into the interference subframe. In the set; if the first subframe is not a victim subframe, the base station divides the first subframe into the interference-free subframe set.
  • the interference may also be a certain type of specific interference, and then determining whether the first subframe is a subframe subject to the interference, if the first subframe The subframe is interfered with by the interference, and the first subframe is divided into the interference interference subframe set. If the first subframe is not the subframe interfered by the interference, the first subframe is divided into the interference-free subframe set.
  • the subframes in the link may also be classified according to different interference levels of the subframes, and may be classified into a subframe group with a strong interference level and a subframe group with a weak interference level, or may be configured according to The different levels of interference are divided into a plurality of subframe sets, which are not limited in this embodiment of the present invention.
  • the link may also be subject to periodic interference.
  • the period of the periodic interference is T milliseconds, and the duration of the periodic interference is L milliseconds, 0 ⁇ L ⁇ T.
  • multiple subframes in the link are divided into K subframe sets, K is an integer greater than or equal to 2, M is equal to ⁇ , and K subframe sets are the 0th subframe set to the (K-1) subframe set.
  • Subfields of (j/K+i)T to (j/K+l/K+i)T are divided into a set of jth subframes in the K subframe sets, j is an integer, 0 j (K-l), i is an integer greater than or equal to zero.
  • part of the frequency band of the LTE system coincides with the frequency band of the Digital Enhanced Cordless Telecommunications (DECT) cordless telephone system, and the cordless telephone system has a periodic beacon signal during the call, the beacon The signal has a period of T of 10 milliseconds and a duration of L of 1 millisecond.
  • the uplink or downlink of the base station may be periodically interfered by.
  • the subframe length of the LTE system is also exactly 1 millisecond.
  • the subframes of the LTE system may be sequentially numbered 0, 1, 2, 3, 4, 5 in chronological order. 6, 7, 8, 9, 10, 1 1 ...
  • K is 10, ie K
  • the sub-frame set is the 0th sub-frame set to the 9th sub-frame set, and then the (j/K+i)T to (j/K+ l /K+i)T sub-frames can be divided into K sub-frame sets.
  • the j-th subframe set that is, the j-th subframe set includes all subframes numbered j + 10i, j is an integer greater than or equal to 0, less than or equal to 9, and i is an integer greater than or equal to 0, such that in DECT During the communication process, at least one of the 10 subframe sets includes subframes that are continuously interfered by the DECT beacon signal.
  • the actual link quality for the 10 subframe sets is respectively determined.
  • the control parameters of each subframe set and the target expectation of the control parameters are set, and adaptively adjusted, so that the control parameters of each subframe set in the 10 subframe sets can reach the target expectation of the corresponding control parameters.
  • SRS Sounding Reference Signal
  • the sub-frame is caused.
  • the equivalent code rate of the data transmitted on the frame is increased, and each subframe includes a plurality of data symbols. Since the terminal device switches from the data symbol to the SRS symbol in the process of data transmission, a power switching period of up to 40 microseconds is allowed. Thereby, the demodulation performance of the subframe including the SRS symbol is affected, and the demodulation capability of the subframe is further deteriorated, and the subframe including the SRS symbol is referred to as an SRS subframe.
  • the terminal device switches from the SRS symbol to the data symbol during data transmission, there is also a power switching transition period of up to 40 microseconds, thereby affecting the first subframe of the subsequent subframe of the SRS subframe in the link.
  • the demodulation capability of the data symbols makes the overall demodulation capability of the subsequent subframe of the SRS subframe in the link also poor.
  • the latter subframe of the SRS subframe is the first sub-sequence after the SRS subframe in the uplink. frame.
  • all subframes included in the link may be divided into multiple subframe sets. For example, multiple subframes in the link are divided into a first subframe set and a second subframe.
  • a frame set and a third subframe set M is equal to 3; wherein the first subframe set includes all SRS subframes in the plurality of subframes, and the second subframe set includes the first one after each SRS subframe in the multiple subframes The subframes, the third subframe set includes all subframes of the plurality of subframes except the first subframe set and the second subframe set.
  • the division may be performed according to other classification criteria, which is not limited in this embodiment of the present invention.
  • the first subframe is any one of the multiple subframes; when the first subframe is an SRS subframe, dividing the first subframe into the first subframe set When the first subframe is not the SRS subframe, it is determined whether the first subframe is the next subframe of the SRS subframe; if the first subframe is the next subframe of the SRS subframe, the first subframe is divided. To the second subframe set; if the first subframe is not the next subframe of the SRS subframe, the first subframe is divided into the third subframe set.
  • the method for classifying the subframes in the link is various, and may be set according to a specific situation in the actual application.
  • the classification method provided by the embodiment of the present invention is only an exemplary description, and the specific classification method is not Make a limit.
  • the link adaptation may be adaptively adjusted on the uplink, or may be adaptively adjusted on the downlink.
  • the error block rate may be set to control parameters for adaptively adjusting each subframe set, the block error rate target value is set as the target expectation of the control parameter of each subframe set, and the block error rate target value of each subframe set is set. All the same.
  • the base station may perform link adaptive adjustment for different subframe sets respectively.
  • the base station may perform adaptive adjustment on the first subframe set, where the first subframe set is any one of the M subframe sets, and the base station may acquire the M subframe sets in the preset time period in the uplink.
  • the statistic value of the block error rate of the first subframe set and then obtaining the MCS order of the first subframe set according to the size relationship between the block error rate statistic value of the first subframe set and the block error rate target value, and
  • the device sends uplink grant signaling, where the uplink grant signaling includes the MC S order, so that the terminal device uses the MCS order to transmit data on the first subframe set, and the terminal device establishes an uplink with the base station.
  • the base station may perform a difference between the statistic value of the block error rate of the first subframe set and the target value of the block error rate.
  • the terminal device Obtaining the MCS order of the first subframe set, and then sending the uplink grant signaling to the terminal device, where the uplink grant signaling includes the MCS order, and after receiving the uplink grant signaling, the terminal device acquires the MC S order And using the MC S order at Transmitting data on the first subframe set, when the terminal device selects the MCS order to transmit data on the first subframe set, the error block rate of the first subframe set can be reduced, so that the first subframe set is incorrectly blocked.
  • the rate converges to the target value of the block error rate; when the statistic value of the block error rate of the first subframe set acquired by the base station is smaller than the target value of the block error rate, the base station may calculate the block error rate and the block error rate according to the first subframe set.
  • the uplink grant signaling includes the MCS order
  • the terminal device receives the uplink grant signaling
  • Obtaining the MC S order and transmitting data on the first subframe set by using the MC S order, and increasing the first sub-subject when the terminal device selects the MC S order to transmit data on the first subframe set
  • the block error rate of the frame set is such that the block error rate of the first subframe set converges to the block error rate target value.
  • the base station may further obtain the correction amount of the uplink SINR according to the difference between the block error rate statistics value of the first subframe set and the block error rate target value, and then according to the average SINR and the SINR of the uplink.
  • the correction quantity is used to obtain the MC S order of the first sub-frame set, and the specific adjustment process is the prior art, which is not described herein.
  • the embodiment of the present invention is only described by taking the control error block rate as an example.
  • the target expectation of other control parameters and other control parameters can also be set, thereby implementing link adaptive adjustment for different subframe sets.
  • This embodiment of the present invention does not describe this.
  • the adjustment method in this embodiment is only an example. In an actual application, the adjustment may be performed according to different control parameters and the target of the control parameter, and other suitable existing adaptive technologies may be used for adjustment.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE frequency division duplex Frequency Division
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • the embodiment of the present invention is described by taking an LTE frequency division duplex system as an example, and does not limit the application scope of the technical solution of the present invention.
  • the link adaptation adjustment method provided by the embodiment of the present invention when performing link adaptation adjustment, first classifies multiple subframes in the link to obtain multiple subframe sets, and then sets each subframe set The target expectation of the control parameters is determined, and the link adaptive adjustment is performed for each subframe set separately, which improves the system performance while enhancing the link adaptive technology control capability.
  • the method for link adaptation adjustment includes:
  • Step 301 The multiple subframes in the link are divided into two subframe sets, which are an interference subframe set and a non-interference subframe set, respectively.
  • the link is an uplink established between the base station and the terminal device.
  • the base station may divide the multiple subframes in the uplink into two subframe sets according to different demodulation capabilities, respectively, interference.
  • the subframe set and the interference-free subframe set in actual application, the base station can predict the interference degree of the subframe, or the base station can determine whether the subframe is interfered, wherein the interference subframe set includes all the multiple subframes in the uplink.
  • the interfered subframe, the non-interfering subframe set includes all undisturbed subframes of the plurality of subframes in the uplink.
  • the first subframe is any one of all subframes, first determine whether the first subframe is a victim subframe; if the first subframe is a victim subframe, divide the first subframe into In the interference subframe set; if the first subframe is not the interfered subframe, the first subframe is divided into the interference-free subframe set.
  • Step 302 Set an adaptively adjusted control parameter and a target expectation of the control parameter for the interference subframe set.
  • the error block rate may be set as the control parameter of the interference subframe set
  • the first block error rate target value is set as the target expectation of the control parameter
  • the first block error rate target value is the error block of the interference subframe set. Rate target value.
  • Step 303 Set an adaptively adjusted control parameter and a target expectation of the control parameter for the interference-free subframe set.
  • the error block rate may be set as a control parameter of the interference-free subframe set
  • the second block error rate target value is set as the target expectation of the control parameter
  • the second block error rate target value is the interference-free subframe set.
  • the block error rate target value may be the same as the first block error rate target value or may be different.
  • control parameters of the interference subframe set and the control parameters of the interference-free subframe set may be different.
  • the control parameter set for the interference subframe set is the error block rate, and the target expectation of the control parameter is error.
  • the block rate is not more than 1%
  • the control parameter set for the interference-free subframe set is the average spectral efficiency, and the target of the control parameter is expected to maximize the average spectral efficiency.
  • the embodiment of the present invention assumes that the same control parameter and the target expectation of the control parameter are set for the interference subframe set and the interference-free subframe set, and the same error block rate target value is set by the interference subframe set and the interference-free subframe set.
  • the first block error rate target value is the same as the second block error rate target value.
  • Step 304 Perform link adaptation adjustment on the interference subframe set, so that the control parameter of the adjusted interference subframe set satisfies the target expectation of the control parameter.
  • the base station when performing link adaptation adjustment on the interference subframe set, the base station first acquires a block error rate statistic value of the subframe included in the interference subframe set in the preset time period in the uplink, and then according to the interference subframe.
  • the relationship between the block error rate statistics value and the block error rate target value obtains the MC S order of the interference subframe set, and sends uplink grant signaling to the terminal device, where the uplink grant signaling includes the MC S order.
  • the terminal device In order for the terminal device to transmit data on the interference subframe set by using the MC S order, the terminal device is configured to establish an uplink with the base station.
  • the base station may obtain interference according to the difference between the statistic value of the error block rate of the interference subframe set and the target value of the error block rate.
  • the SINR correction amount of the subframe set and then acquiring the MC S order of the interference subframe set according to the average SINR and the SINR correction amount, and then transmitting uplink grant signaling to the terminal device, where the uplink grant signaling includes the MCS order, After receiving the uplink grant signaling, the terminal device acquires the MC S order, and uses the MC S order to transmit data on the interference subframe set, and when the terminal device selects the MC S order, transmits the data on the interference subframe set.
  • the error block rate of the interference subframe set can be reduced, so that the block error rate of the interference subframe set converges to the block error rate target value; when the block error rate of the interference subframe set acquired by the base station is smaller than the block error rate target
  • the base station may obtain the SINR correction amount of the interference subframe set according to the difference between the error block rate statistics value of the interference subframe set and the block error rate target value, and then correct according to the average SINR and SINR.
  • the terminal device Obtaining the MCS order of the interference subframe set, and sending the uplink grant signaling to the terminal device, where the uplink grant signaling includes the MC S order, and after receiving the uplink grant signaling, the terminal device acquires the MC S order And using the MC S order to transmit data on the interference subframe set, when the terminal device selects the MC S order to transmit data on the interference subframe set, the error block rate of the interference subframe set can be increased, so that the interference The block error rate of the subframe set converges to the block error rate target value.
  • the process of obtaining the average SINR and the SINR correction amount is a prior art, and the embodiments of the present invention are not described herein.
  • Step 305 Perform link adaptation adjustment on the interference-free subframe set, so that the control parameter of the interference-free subframe set satisfies the target expectation of the control parameter.
  • the terminal device uses the MC S order to transmit data on the interference-free subframe set.
  • the base station may obtain the statistic value and error of the block error rate according to the non-interference subframe set. Obtaining the difference between the block rate target values, obtaining the SINR correction amount of the interference-free subframe set, and then acquiring the MC S order of the interference-free subframe set according to the average SINR and the SINR correction amount, and then transmitting the uplink grant signaling to the terminal device,
  • the uplink grant signaling includes the MCS order, and after receiving the uplink grant signaling, the terminal device acquires the MC S order, and uses the MC S order to transmit data on the interference-free subframe set, when the terminal device selects
  • the MCS order transmits data on the interference-free subframe set
  • the error block rate of the interference-free subframe set can be reduced, so that the block error rate of the interference-free subframe set converges to the block error rate target value;
  • the SINR correction quantity and then acquiring the MC S order of the interference-free subframe set according to the average SINR and the SINR correction amount, and transmitting uplink grant signaling to the terminal device, where the uplink grant signaling includes the MC S order
  • the terminal device acquires the MC S order, and uses the MCS order to transmit data on the interference-free subframe set, and the terminal device selects the MCS order on the interference-free subframe set.
  • the block error rate of the interference-free subframe set can be increased, so that the block error rate of the interference-free subframe set converges to the block error rate target value.
  • the same error block rate target value is set for the interference subframe set and the interference-free subframe set, and the link adaptation adjustment is performed for the two subframe sets respectively, so that the block error rate of the subframe in the link can be guaranteed.
  • the statistics can converge to the same block error rate target value.
  • step 302 and step 303 in this embodiment may be appropriately adjusted, and the steps may also be correspondingly increased or decreased according to the situation.
  • step 302 and step 303 in this embodiment may be reversed, and the sequence of steps 304 and 305 may also be reversed. Any method that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Within the scope of protection, it will not be repeated.
  • the link adaptation adjustment method provided by the embodiment of the present invention firstly classifies multiple subframes in the link to obtain two subframe sets when performing link adaptation adjustment.
  • the interference subframe set and the interference-free subframe set are respectively set, then the target expectation of the control parameter and the control parameter are respectively set for the two subframe sets, and the link adaptation is respectively performed on the two subframe sets, and the link is adjusted in the enhanced link.
  • the embodiment of the present invention provides a base station 40, as shown in FIG. 4, including:
  • the classification unit 401 is configured to divide the multiple subframes in the link into M subframe sets, where the link is established by the base station and the terminal device, and each subframe set in the M subframe sets includes at least one subframe, where M is greater than Or an integer equal to 2.
  • the link is an uplink or a downlink established between the base station 40 and the terminal device.
  • the classification unit 401 of the base station 40 can classify each subframe in the link to obtain M sub-frames.
  • the set of frames, M is an integer greater than or equal to 2.
  • the setting unit 402 is configured to separately set an adaptively adjusted control parameter and a target expectation of the control parameter for each of the M subframe sets divided by the classification unit 401.
  • the adaptively adjusted control parameters include one or a combination of a block error rate, a bit error rate, an average number of retransmissions, an average transmission delay, and an average spectral efficiency, and the control parameters can control the actual communication quality of the link.
  • the control parameters may also include other parameters of the link adaptation adjustment technique, which are not limited in this embodiment of the present invention.
  • the target expectation can be a specific value.
  • the target expectation of the block error rate can be set to 10%.
  • the target expectation can also be an optimization target, for example, when the adaptively adjusted control parameter is the average of the data transmission.
  • the target expectation of the control parameter may be such that the average spectral efficiency is maximized under the existing link quality.
  • the target expectation may also be a desired combination of multiple control parameters, such as an average retransmission. The average spectral efficiency is maximized if the number of times is less than one.
  • the setting unit 402 may set the error block rate as the control parameter of each subframe set, and set the same or different error block for the block error rate of each subframe set.
  • the target value is used as the target expectation, or the average transmission delay is set as the control parameter of each subframe set, and the same or different average transmission delay target value is set as the target expectation of the control parameter, and the average spectral efficiency can also be set.
  • Control The parameter is set, the same or different average spectral efficiency value is set as the target of the control parameter, and the actual application is set according to specific requirements, which is not limited by the embodiment of the present invention. It should be noted that different control parameters and target requirements of the control parameters may be set for different subframe sets.
  • control parameter set for the first subframe set is a block error rate
  • target expectation of the control parameter is error.
  • the block rate is not more than 1%
  • the control parameter set for the second subframe set is the average spectral efficiency
  • the target of the control parameter is expected to maximize the average spectral efficiency and the like.
  • the adjusting unit 403 is configured to perform link adaptation adjustment on each of the M subframe sets divided by the classifying unit 401, so that the control parameter corresponding to each subframe set after the adjustment meets the target expectation of the control parameter.
  • the adjusting unit 403 performs link adaptive adjustment on each subframe set according to the control parameter of each subframe set and the target of the control parameter, for example, adaptively adjusting the error block rate of the first subframe set,
  • the target of the fixed block error rate is expected to be 10%
  • the adjusting unit 403 performs link adaptive adjustment on the first subframe set, so that the actual block error rate of the first subframe set converges to 10%.
  • the classification unit When performing link adaptation adjustment, the classification unit first classifies a plurality of subframes in the link to obtain a plurality of subframe sets, and then sets a unit to set a control parameter and a control parameter target for each subframe set. It is expected that the adjustment unit separately performs link adaptation adjustment for each subframe set, and effectively improves the system performance while enhancing the link adaptation technology control capability.
  • the classification unit 401 can increase the number of links.
  • the subframes are divided into an interference subframe set and a non-interference subframe set.
  • the interference subframe set includes all the interfered subframes in the multiple subframes
  • the interference-free subframe set includes all the undisturbed subframes in the multiple subframes.
  • the link may also be subject to periodic interference
  • the periodic interference period is T milliseconds
  • the periodic interference duration is L milliseconds, 0 ⁇ L ⁇ T.
  • the classification unit 401 is further configured to divide the multiple subframes in the link into K subframe sets, where K is an integer greater than or equal to 2, M is equal to ⁇ , and K subframe sets are 0.
  • the subframe is aggregated to the (K-l)th subframe set.
  • Subfields of (j/K+i)T to (j/K+l/K+i)T are divided into a set of jth subframes in the K subframe sets, j is an integer, 0 j (K-l), i is an integer greater than or equal to 0.
  • an SRS subframe exists in the uplink of the LTE system, and since the last data symbol on the SRS subframe is used to carry the reference signal and cannot transmit data, the equivalent code rate of the data transmitted on the subframe is caused.
  • the demodulation performance of the subframe including the SRS symbol is improved, and the demodulation capability of the subframe is further deteriorated.
  • the data symbol carrying the reference signal is called an SRS symbol
  • the subframe including the SRS symbol is called an SRS subframe. . Therefore, when an SRS subframe exists in the link, all the subframes included in the link may be divided into multiple subframe sets.
  • the classification unit 401 may be further configured to divide multiple subframes in the link.
  • the uplink may be divided according to other classification criteria, which is not limited in this embodiment of the present invention.
  • the method for classifying the subframes in the link is various, and may be set according to a specific situation in the actual application.
  • the classification method provided by the embodiment of the present invention is only an exemplary description, and the specific classification method is not Make a limit.
  • the link adaptation may be adaptively adjusted on the uplink, or may be adaptively adjusted on the downlink.
  • the setting unit 402 may set a control parameter of the error block rate for adaptively adjusting each subframe set, set the block error rate target value as the target expectation of the control parameter of each subframe set, and the error of each subframe set
  • the block rate target values are the same.
  • the base station 40 may perform uplink adaptive adjustment for each subframe set according to the control parameter set by the setting unit 402 for each subframe set and the target expectation of the control parameter, for example, for the first sub- Frame set for adaptive adjustment, first
  • the subframe set is any one of the M subframe sets.
  • the base station 40 further includes an obtaining unit 404, configured to acquire a block error rate of the first subframe set in the preset time period in the uplink.
  • the base station 40 further includes a sending unit 405, configured to the terminal device
  • the uplink grant signaling is sent, and the uplink grant signaling includes the MC S order, so that the terminal device uses the MC S order to transmit data on the first subframe set, and the terminal device establishes an uplink with the base station.
  • the acquiring unit 404 when the error block rate statistics value of the first subframe set acquired by the acquiring unit 404 is greater than the block error rate target value, the acquiring unit 404 is configured according to the block error rate statistics value and the block error rate target of the first subframe set.
  • the difference between the values, the MC S order of the first subframe set is obtained, and then the uplink grant signaling is sent to the terminal device by using the sending unit 405, where the uplink grant signaling includes the MC S order, and the terminal device uses the MC S
  • the order transmits data on the first subframe set, and when the terminal device selects the MCS order to transmit data on the first subframe set, the error block rate of the first subframe set can be reduced, so that the first subframe set
  • the error block rate converges to the block error rate target value; when the block error rate statistic value of the first subframe set acquired by the obtaining unit 404 is smaller than the block error rate target value, the obtaining unit 404 is configured according to the error block of the first subframe
  • the difference between the rate statistics and the target value of the block error rate is obtained, and the MCS order of the first subframe set is obtained, and then the uplink grant signaling is sent to the terminal device by using the sending unit 405, where the uplink grant signaling includes the MC S order.
  • the terminal device uses the MC S order to transmit data on the first subframe set.
  • the block error rate of the first subframe set can be increased.
  • the block error rate of the first subframe set is converged to the block error rate target value.
  • the embodiment of the present invention is only described by taking the control error block rate as an example.
  • the target expectation of other control parameters and other control parameters can also be set, thereby implementing link adaptive adjustment for different subframe sets.
  • This embodiment of the present invention does not describe this.
  • the adjustment method of the adjustment unit 103 in this embodiment is only an example.
  • ⁇ according to different control parameters and the target expectation of the control parameter, other suitable existing adaptive technologies may also be used for adjustment, and the present invention is implemented. This example will not be described in detail.
  • the classification unit in this embodiment may be a base station processor, and It can be implemented in a certain processor of the base station. In addition, it can also be stored in the memory of the base station in the form of program code, and the function of the above classification unit is called and executed by a certain processor of the base station.
  • the implementation of the setting unit is similar to the classification unit, and can be integrated with the classification unit or independently.
  • the implementation of the adjustment unit is similar to the setting unit.
  • the processor described herein may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated systems configured to implement embodiments of the present invention. Circuit.
  • the base station in the embodiment of the present invention is described by using an evolved NodeB (eNB) in the LTE system as an example, and may be another base station having a link adaptive modulation function, which is not limited in this embodiment of the present invention.
  • eNB evolved NodeB
  • the classification unit when performing link adaptation adjustment, first classifies the subframes of the link to obtain a plurality of subframe sets, and then the setting unit sets an adaptation for each subframe set. Controlling the target parameters of the control parameters and the control parameters, and performing link adaptive adjustment on each of the subframe sets by the adjusting unit, respectively, compared with the prior art, while enhancing the link adaptive technology control capability, effectively Improve system performance.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as the units may or may not be physical units. Located in one place, or distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

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Abstract

Des modes de réalisation de la présente invention concernent un procédé et un appareil de réglage adaptatif de liaison. Le procédé de réglage adaptatif de liaison comprend les étapes suivantes : premièrement, classification de multiples sous-trames dans une liaison en M ensembles de sous-trames, chacun des M ensembles de sous-trames comprenant au moins une sous-trame ; réglage séparé d'un paramètre de commande de réglage adaptatif et d'une espérance cible du paramètre de commande pour chacun des M ensembles de sous-trames ; et ensuite, exécution d'un réglage adaptatif de liaison sur chacun des M ensembles de sous-trames, de sorte que le paramètre de commande correspondant à chacun des ensembles de sous-trames réglés réponde à l'espérance cible du paramètre de commande. Les modes de réalisation de la présente invention permettent d'améliorer efficacement les performances du système tout en améliorant la capacité de commande d'une technologie d'adaptation de liaison.
PCT/CN2014/074210 2014-03-27 2014-03-27 Procédé et appareil de réglage adaptatif de liaison Ceased WO2015143672A1 (fr)

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