WO2016082085A1 - Procédé et appareil de modulation et de codage adaptatifs - Google Patents

Procédé et appareil de modulation et de codage adaptatifs Download PDF

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Publication number
WO2016082085A1
WO2016082085A1 PCT/CN2014/092057 CN2014092057W WO2016082085A1 WO 2016082085 A1 WO2016082085 A1 WO 2016082085A1 CN 2014092057 W CN2014092057 W CN 2014092057W WO 2016082085 A1 WO2016082085 A1 WO 2016082085A1
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Prior art keywords
cell
base station
tti
information
scheduling information
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PCT/CN2014/092057
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English (en)
Chinese (zh)
Inventor
唐志华
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华为技术有限公司
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Priority to PCT/CN2014/092057 priority Critical patent/WO2016082085A1/fr
Priority to CN201480036325.3A priority patent/CN105830376B/zh
Publication of WO2016082085A1 publication Critical patent/WO2016082085A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received

Definitions

  • the present invention relates to the field of wireless, and in particular, to a method and apparatus for adaptive modulation coding.
  • Adaptive Modulation and Coding (AMC) technology is an adaptive modulation and coding scheme (MCS) based on the state of the wireless channel to ensure the reliability of the wireless communication system.
  • MCS adaptive modulation and coding scheme
  • an evolved NodeB receives a reference signal sent by a user equipment (User Equipment, UE), such as a channel sounding reference signal (Sounding). a reference signal (SRS) or a demodulation reference signal (DMRS), and measuring an uplink signal to interference plus noise ratio (SINR) according to the reference signal, and smoothing the SINR, Obtaining an uplink SINR smoothing filter value; when scheduling the UE, the base station uses the uplink SINR smoothing filter value as a SINR prediction value when the UE performs actual data transmission after a plurality of transmission time intervals (TTIs), and adjusts by SINR.
  • the SINR prediction value is modified to obtain an SINR value, and the MCS to be used for the output is obtained according to the SINR value and the correspondence between the uplink SINR and the uplink MCS.
  • the data transmission of the UE is not only continuous in the time domain but also frequently changes in the frequency domain, so that the neighboring area interference received by the UE changes very sharply, and there is no any in the time domain. Correlation.
  • the base station can obtain the neighboring cell interference through the interaction between the base stations.
  • the non-ideal backhaul in the actual wireless network system causes the base station to fail to acquire the neighboring cell interference in time, and cannot accurately select the MCS by using the real-time interference information. Therefore, in the non-ideal backhaul scenario, the neighboring area is utilized. Interference information improves the accuracy of MCS selection and system throughput is an urgent problem to be solved.
  • Embodiments of the present invention provide a method and apparatus for adaptive modulation coding, which can improve the accuracy of MCS selection and thereby improve system throughput.
  • a method for adaptive modulation coding comprising:
  • the first base station determines scheduling information of the first user equipment UE of the first cell at the TTI N, where the scheduling information includes a resource block and a transmission power allocated to the first UE, where In the TTI N, the first base station schedules the first UE, and the first cell belongs to the first base station;
  • the first base station acquires scheduling information of the second UE of the second cell, where the second cell belongs to the second base station, and the scheduling information of the second UE is that the second UE is in the The scheduling information of the TTI, the scheduling information of the second UE is scheduling information that is determined by the second base station in the TTI NT and sent to the first base station;
  • the first base station acquires measurement information of the first UE in the first cell, and the second UE is in the Measuring information in the first cell;
  • the first base station acquires the first base station according to the measurement information of the first UE and the scheduling information of the first UE, and the measurement information of the second UE in the first cell and the scheduling information of the second UE.
  • the first base station determines the MCS corresponding to the SINR value of the first UE according to the correspondence between the SINR and the modulation and coding mode MCS.
  • the method further includes :
  • the first base station acquires retransmission information of the third UE in the first cell, and the retransmission information includes feedback information that the third UE needs to retransmit in the TTI N, where the S If the T is smaller than the T, the T is a delay of acquiring, by the first cell of the first base station, scheduling information of the second UE of the second cell;
  • the first base station determines that the third UE is not scheduled in the TTI N-T, and delays the third UE by one scheduling period scheduling.
  • the delaying the scheduling of the third UE by one scheduling period includes:
  • the first base station determines scheduling information of the third UE of the first cell at TTI N+8, at TTI N+8, The first base station sends an uplink grant UL Grant to the third UE, where the new data in the ULGrant indicates that the NDI does not reverse, so that the third UE performs retransmission in an adaptive retransmission manner.
  • the method for adaptive modulation and coding according to claim 1, wherein the method further comprises:
  • the first base station acquires retransmission information of the third UE in the first cell, and the retransmission information includes feedback information that the third UE needs to retransmit in the TTI N;
  • the first base station determines scheduling information of the third UE of the first cell in the TTI N, and the T is the second cell of the first base station acquires the second information of the second cell. Delay of scheduling information of the UE;
  • the method further includes:
  • the first base station sends an uplink grant ULGrant to the third UE, where new data in the UL Grant indicates that the NDI does not reverse, so that the third UE adopts an adaptive retransmission mode. Retransmission.
  • a method for adaptive modulation coding including:
  • the first base station determines scheduling information of the first user equipment UE of the first cell at TTI N, and the scheduling information includes: The allocated resource block and the transmit power, wherein, in the TTI N, the first base station schedules the first UE, and the first cell belongs to the first base station;
  • the first base station acquires retransmission information of the first UE in the first cell, and the retransmission information includes feedback information that the first UE needs to retransmit in the TTI N;
  • the first base station sends an uplink grant ULGrant to the first UE, where new data in the UL Grant indicates that the NDI does not reverse, so that the first UE adopts an adaptive retransmission mode. Retransmission.
  • a base station including:
  • a processing unit configured to: at a transmission time interval TTI NT, the first base station determines scheduling information of the first user equipment UE of the first cell at TTI N, where the scheduling information includes a resource block and a transmit power allocated to the first UE In the TTI N, the first base station schedules the first UE, and the first cell belongs to the first base station;
  • An acquiring unit configured to acquire scheduling information of a second UE of the second cell, where the second cell belongs to the second base station, and the scheduling information of the second UE is the The scheduling information of the second UE in the TTI, the scheduling information of the second UE is scheduling information that is determined by the second base station in the TTI NT and sent to the first base station;
  • the acquiring unit is further configured to: when the resource block of the first UE is the same as the resource block of the second UE, the first base station acquires measurement information of the first UE in the first cell, and Measurement information of the second UE in the first cell;
  • the processing unit is further configured to: according to the measurement information of the first UE and the scheduling information of the first UE, and the measurement information of the second UE in the first cell and the scheduling information of the second UE, The first base station acquires a signal to interference plus noise ratio SINR predicted value of the first UE;
  • the processing unit is further configured to obtain, by the first base station, an SINR value of the first UE according to the SINR predicted value and an SINR adjustment amount;
  • the processing unit is further configured by the first base station according to an SINR and a modulation and coding manner Corresponding relationship of the MCS, determining an MCS corresponding to the SINR value of the first UE.
  • a base station including:
  • a processing unit configured to: at a transmission time interval TTI NT, the first base station determines scheduling information of the first user equipment UE of the first cell at TTI N, where the scheduling information includes a resource block and a transmit power allocated to the first UE In the TTI N, the first base station schedules the first UE, and the first cell belongs to the first base station;
  • the processing unit is further configured to: in the TTI NS, the first base station acquires retransmission information of the first UE in the first cell, where the retransmission information includes that the first UE needs to be in the TTI Retransmission of feedback information;
  • a sending unit configured to send, by the first base station, an uplink grant UL Grant to the first UE, where the new data in the UL Grant indicates that the NDI does not be reversed, so that the first UE adopts Adaptive retransmission mode for retransmission.
  • a base station including:
  • a memory for storing program code
  • the processor performs the following method: at a transmission time interval TTI NT, the first base station determines scheduling information of the first user equipment UE of the first cell at TTI N, where the scheduling information is included a resource block and a transmit power allocated by the first UE, where, in the TTI, the first base station schedules the first UE, and the first cell belongs to the first base station;
  • a receiver configured to acquire, according to the TTI, the scheduling information of the second UE of the second cell, where the second cell belongs to the second base station, and the scheduling information of the second UE is the The scheduling information of the second UE in the TTI, the scheduling information of the second UE is scheduling information that is determined by the second base station in the TTI NT and sent to the first base station;
  • the method executed by the processor further includes:
  • the first base station acquires measurement information of the first UE in the first cell, and the second UE is in the Measuring information in the first cell;
  • the processor is further configured to use, according to the measurement information of the first UE, the scheduling information of the first UE, and the measurement information of the second UE in the first cell and the scheduling information of the second UE,
  • the first base station acquires a signal to interference plus noise ratio SINR predicted value of the first UE;
  • the processor is further configured to obtain, by the first base station, an SINR value of the first UE according to the SINR prediction value and an SINR adjustment amount;
  • the processor is further configured to determine, by the first base station, the MCS corresponding to the SINR value of the first UE according to the correspondence between the SINR and the modulation and coding mode MCS.
  • a base station including:
  • a memory for storing program code
  • the processor performs the following method: at a transmission time interval TTI NT, the first base station determines scheduling information of the first user equipment UE of the first cell at TTI N, where the scheduling information is included a resource block and a transmit power allocated by the first UE, where, in the TTI, the first base station schedules the first UE, and the first cell belongs to the first base station;
  • the processor is further configured to: in the TTI NS, the first base station acquires retransmission information of the first UE in the first cell, where the retransmission information includes that the first UE needs to be in the TTI Retransmission of feedback information;
  • a transmitter configured to send, by the first base station, an uplink grant UL Grant to the first UE, where the new data in the UL Grant indicates that the NDI is not to be reversed, so that the first UE adopts Adaptive retransmission mode for retransmission.
  • Embodiments of the present invention provide a method and apparatus for adaptive modulation coding.
  • a first base station determines scheduling information of a first UE of a first cell in a TTIN, where the TTI N
  • the first base station acquires scheduling information of the second UE that is determined by the second cell to be sent by the TTIN-T to the first base station, and can overcome the interference factor of acquiring other user equipments to the first UE in a non-ideal backhaul scenario.
  • the transmission delay considering the interference factor of the other user equipment to the first UE, improves the accuracy of the base station calculating the SINR value of the first UE scheduled by the current cell, thereby selecting the MCS according to the SINR value, and improving the accuracy of the MCS selection. Further improving the wireless communication system The throughput rate.
  • FIG. 1 is a schematic structural diagram of an LTE communication system according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a method for adaptive modulation and coding according to an embodiment of the present invention
  • FIG. 3 is a flowchart of another method for adaptive modulation coding according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of still another method for adaptive modulation and coding according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of still another method for adaptive modulation and coding according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of another method for adaptive modulation coding according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • Embodiments of the present invention can be applied to multiple applications consisting of a transmitting end and a receiving end.
  • the uplink is the user equipment and the receiving end is the base station.
  • a schematic structural diagram of an LTE communication system includes a base station A, a base station B, a user equipment 1, a user equipment 2, a user equipment 3, a user equipment 4, a user equipment 5, and a user equipment 6.
  • the coverage of the base station A may be a solid line as shown in FIG. 1 , and the dotted line indicates that the base station A divides the coverage into the cell A1, the cell A2, and the cell A3, and between the cell A1, the cell A2, and the cell A3.
  • the user equipment 1, the user equipment 2, the user equipment 3, and the user equipment 4 are registered in the cell A1, and the user equipment 5 is registered in the cell A2.
  • the user equipment 1, the user equipment 2, the user equipment 3, the user equipment 4, and the user equipment 5 perform wireless communication with the base station A, respectively.
  • the coverage of the base station B may be a solid circle as shown in FIG. 1 , and the dotted line indicates that the base station B divides the coverage into the cell B1, the cell B2, and the cell B3, and the two phases of the cell B1, the cell B2, and the cell B3. adjacent.
  • User equipment 6 is registered in cell B3. User equipment 6 performs wireless communication with base station B.
  • At least two cells in the cell A1, the cell A2, the cell A3, the cell B1, the cell B2, and the cell B3 form a coordinated cell set.
  • An embodiment of the present invention provides a method for adaptive modulation and coding, which is applied to a base station, as shown in FIG. 2, and includes:
  • Step 201 At the transmission time interval TTI N-T, the first base station determines scheduling information of the first user equipment UE of the first cell at TTI N.
  • the first UE is registered in the first cell, and communicates with the base station by using the first cell, where the base station allocates scheduling information to the scheduled first UE, where the scheduling information includes the resource block and the base station allocated by the base station in the first cell.
  • Power the base station to which the first cell belongs.
  • the N is a time when the base station determines scheduling information of the user equipment of the first cell.
  • the scheduling information includes resource blocks and transmit power allocated for the user equipment.
  • Step 202 In the TTI N, the first base station acquires scheduling information of a second UE of the second cell.
  • the second cell belongs to the second base station, and the scheduling information of the second UE is scheduling information of the second UE in the TTI N, and the scheduling information of the second UE is Decoding information that is determined by the second base station at the TTI N-T and sent to the first base station.
  • the second base station to which the second cell belongs is different from the first base station to which the first cell belongs, and the first base station to which the first cell belongs and the second base station to which the second cell belongs can be scheduled through the X2 interface or the S1 interface.
  • the scheduling information of the second UE of the second cell includes a resource block and a transmit power allocated by the second base station to which the second cell belongs to the second UE of the second cell. In the method of the present invention, at least one second user equipment of the second cell is included.
  • the base station may acquire scheduling information of the second user equipment of the at least one second cell in the at least one Transmission Time Interval (TTI).
  • TTI Transmission Time Interval
  • Step 203 When the resource block of the first UE is the same as the resource block of the second UE, the first base station acquires measurement information of the first UE in the first cell, and the second Measurement information of the UE in the first cell.
  • Step 204 The first base station is configured according to the measurement information of the first UE, the scheduling information of the first UE, and the measurement information of the second UE in the first cell and the scheduling information of the second UE. Obtaining a signal to interference plus noise ratio SINR prediction value of the first UE.
  • Step 205 The first base station obtains an SINR value of the first UE according to the SINR prediction value and the SINR adjustment amount.
  • the base station counts an uplink block error rate (BLER) to calculate an adjustment amount of the SINR, and adjusts the SINR prediction value by the adjustment amount of the SINR to obtain an SINR value of the UE. If the uplink BLER does not meet the preset BLER target value, the adjustment amount of the adjustment period will be adjusted according to the preset adjustment amount on the basis of the adjustment amount of the previous period; if the uplink BLER is greater than the BLER target value, the adjustment period of the adjustment period is The adjustment amount will be adjusted according to the preset adjustment range based on the adjustment amount of the previous period.
  • BLER block error rate
  • Step 206 The first base station determines, according to the correspondence between the SINR and the modulation and coding mode MCS, the MCS corresponding to the SINR value of the first UE.
  • the base station schedules the first-time UE of the first cell by using the MCS corresponding to the SINR value of the initial UE.
  • the first base station determines scheduling information of the first UE of the first cell at TTI N, where the first base station acquires the second cell at the TTI NT and determines
  • the scheduling information of the second UE that is sent to the first base station can overcome the transmission delay of the interference factors of the other user equipments to the first UE in the non-ideal backhaul scenario, and consider the interference factors of other user equipments on the first UE.
  • the base station calculates the accuracy of the SINR value of the first UE scheduled by the current cell, and selects the MCS according to the SINR value, thereby improving the accuracy of the MCS selection, thereby improving the throughput of the wireless communication system.
  • An embodiment of the present invention provides a method for adaptive modulation and coding, which is applied to a base station, as shown in FIG. 3, and includes:
  • Step 301 At the transmission time interval TTI N-T, the first base station determines scheduling information of the first user equipment UE of the first cell at TTI N.
  • the scheduling information includes a resource block and a transmit power allocated to the first UE, where, in the TTI N, the first base station schedules the first UE, and the first cell belongs to the first Base station.
  • Step 302 At the TTI N-S, the first base station acquires retransmission information of the first UE in the first cell.
  • the retransmission information includes feedback information that the first UE needs to retransmit in the TTI N. It should be noted that the TTI N-S is smaller than the TTI N-T. Optionally, the TTI N-S is greater than the TTI N-T.
  • Step 303 In the TTI, the first base station sends an uplink grant UL Grant to the first UE, where new data in the UL Grant indicates that the NDI does not reverse, so that the first UE adopts an adaptation. Retransmission mode for retransmission.
  • the first base station determines the scheduling information of the first UE of the first cell in the TTI N, and the first base station acquires the first UE in the first cell, in the TTI NS.
  • Retransmission information in the TTI N, the first base station may send an uplink grant UL Grant to the first UE, where new data in the UL Grant indicates that the NDI does not reverse, so that the first UE adopts Retransmission in the adaptive retransmission mode can overcome the acquisition of other user equipments to the first UE in a non-ideal backhaul scenario.
  • the transmission delay of the interference factor considering the interference factor of the other user equipment to the first UE, improves the accuracy of the base station calculating the SINR value of the first UE scheduled by the current cell, thereby selecting the MCS according to the SINR value, and improving the MCS selection. Accuracy, which in turn increases the throughput of wireless communication systems.
  • the embodiment of the present invention provides a method for adaptive modulation and coding, which is applied to the LTE communication system shown in FIG. 1 , as shown in FIG. 4 , and includes:
  • Step 401 At TTI N-T, the base station A determines scheduling information of the user equipment 1 and the user equipment 2 of the cell A1 at the TTI N.
  • the cell A1 of the base station A acquires the scheduling information of the user equipment 1 that is delayed in the last scheduling period in which the TTI N needs to perform data transmission, and the scheduling information of the user equipment 2 that needs to be initially transmitted, and the user equipment that is delayed in the previous scheduling period.
  • the scheduling information of 1 and the scheduling information of the user equipment 2 that needs to be initially transmitted are shared with other cells, such as cell B3.
  • the user equipment 2 is an initial user equipment, and the base station A allocates a resource block and a transmission power to the user equipment 2 in the cell A1.
  • the scheduling information of the cell A1 includes a resource block and a transmission power allocated to the user equipment 2.
  • the T is the time when the cell A1 of the base station A acquires the scheduling information of the user equipment 5 of the cell A2 and the scheduling information of the user equipment 6 of the cell B3, and the N is the user of the cell A1 that determines the cell A1.
  • Scheduling information of the device Generally, one scheduling period of Frequency Division Duplexing (FDD) is 8 transmission time intervals.
  • Step 402 At the TTI N-S, the base station A acquires the retransmission information of the user equipment 3 in the cell A1.
  • the retransmission information includes feedback information that the user equipment 3 needs to retransmit at the TTI N.
  • Step 403 At TTI N, the base station A acquires scheduling information of the user equipment 5 of the cell A2 and scheduling information of the user equipment 6 of the cell B3.
  • the cell A1 of the base station A acquires the scheduling information of the user equipment 5 of the cell A2 through the internal interface, and the cell A1 of the base station A acquires the scheduling information of the user equipment 6 of the cell B3 from the base station B through the X2 interface.
  • the scheduling information of the user equipment 6 of the cell B3 may be scheduling information that the base station B determines and transmits to the base station A at the TTI N-T.
  • the scheduling information includes the cell A2 of the base station A, which allocates a resource block to the user equipment 5.
  • the transmit power the cell B3 of the base station B allocates the resource block and the transmit power to the user equipment 6.
  • N-S ⁇ N.
  • the first cell, the second cell, and the third cell are cells of the same coordinated cell set, and the first cell acquires the second cell between the first TTI and the Nth TTI.
  • the scheduling information of the third cell the second cell acquires scheduling information of the first cell and the third cell
  • the third cell acquires scheduling information of the first cell and the second cell.
  • the first cell, the second cell, and the third cell respectively perform cooperative interference prediction, and obtain the SINR prediction value.
  • the cell in the present invention may be a cell in a coordinated cell set, and the coordinated cell set includes at least two cells, which may be statically set or dynamic.
  • the cells included in the coordinated cell set may also be cells of different base stations, and the scheduling information is exchanged between multiple base stations through optical fibers or Ethernet (such as the interconnection protocol radio access network IPRAN), but the cells in the coordinated cell set must be ensured. Synchronous.
  • Step 404 The base station A determines to retransmit the user equipment.
  • the base station sends an uplink grant to the user equipment in the nth subframe, and allocates uplink resources to the user equipment to facilitate the user equipment.
  • the data is transmitted by using the uplink resource, and the user equipment receives the uplink grant in the nth subframe, and the initial data is received in the n+4th subframe, and the physical layer baseband processing part decodes the data according to the 24-bit cyclic redundancy.
  • the Cyclic Redundancy Check (CRC) checksum verifies the correctness of the decoded data, and sends the decoding result to the HARQ entity.
  • CRC Cyclic Redundancy Check
  • the HARQ entity sends the feedback information to the user equipment in n+8 subframes, if the decoding is correct.
  • Send ACK send NACK if decoding error.
  • the user equipment receives the feedback information of the initial transmission data in n+8 subframes, and if the ACK is received, transmits new data in the next polling subframe, and if the NACK is received, sends the retransmission in n+12 subframes. data.
  • the retransmission user equipment that needs to be retransmitted at the N is determined according to the TTI N retransmission user equipment and the initial user equipment acquired at the TTI N-S. Specifically, if the TTI N retransmission user equipment acquired in the TTI NS is scheduled in the TTI NT, the TTI N retransmission user equipment acquired in the TTI NS is determined to be in the TTI N Retransmission user equipment that needs to be retransmitted; if the TTI N retransmission user equipment acquired in the TTI NS is not scheduled in the TTI NT, the TTI N retransmission user acquired in the TTIN-S is obtained. The device is delayed by one scheduling cycle.
  • the base station A only obtains the scheduling information of the user equipment 1 and the user equipment 2 in the cell A1, and does not obtain the retransmission information of the user equipment 3 in the cell A1 at the TTI N, and only the user equipment 1 and the user
  • the scheduling information of the device 2 in the cell A1 is shared to other cells, and in the TTI NS, the base station A acquires the retransmission information of the TTI N user equipment 3 in the first cell, and therefore, the base station A delays the user equipment 3 by one scheduling period. Scheduling.
  • the base station A sends an acknowledgement ACK to the user equipment 3, suspends the hybrid automatic repeat request process of the user equipment 3, and then delays 8 TTIs on the air interface (LTE uplink is synchronous HARQ) and retransmits the uplink scheduling indication UL Grant scheduling user equipment 3 .
  • LTE uplink is synchronous HARQ
  • UL Grant scheduling user equipment 3 Because T TTIs are scheduled in advance, the user equipment 3 is scheduled to be delayed by 8-T TTIs, that is, 8 TTIs are delayed on the air interface.
  • the HARQ scheduling period is equivalent to delaying from 8 TTIs to 16 TTIs.
  • the retransmission must send a UL Grant, where the new data indicates that the NDI does not flip, and the adaptive retransmission mode is adopted.
  • the user equipment 3 when the user equipment 3 receives only the ACK and does not receive the ULGrant, the data is not retransmitted, but the variable CURRENT_TX_NB of the number of transmissions is still accumulated. Once the CURRENT_TX_NB reaches the configured maximum number of transmissions -1, the user equipment 3 clears the HARQ. Cache. In order to solve this problem, if the target maximum number of retransmissions is M, then the maximum number of retransmissions configured for the UE needs to be 2M.
  • the base station A acquires the retransmission information of the TTI N user equipment 1 in the cell A1, and in the TTI NT, the cell A1 of the base station A acquires the scheduling information of the user equipment 1 that was delayed in the previous scheduling period. Because the user equipment 1 is scheduled in the TTI NT, the user equipment 1 is retransmitted according to the scheduling information of the user equipment 1 that was delayed in the previous scheduling period. In this way, it will not affect other scheduled users in the community. It also does not affect the interference estimates in the neighbourhood.
  • the TTI NS when S>T, in the TTI NS, retransmission information of the user equipment in the cell A1 is retransmitted in the TTI N, where the retransmission information includes the retransmission user equipment needs to be retransmitted in the TTI N Feedback information; at TTI NT, acquiring scheduling information of the initial user equipment in the TTI N cell A1 and scheduling information of the retransmission user equipment; at TTI N, acquiring the TTI in the TTI NS The N retransmission user equipment determines that the retransmission user equipment needs to be retransmitted in the TTI N.
  • the base station A acquires the retransmission information of the TTI N user equipment 4 in the cell A1, and obtains the scheduling information of the user equipment 2 in the TTI N cell A1 and the scheduling information of the user equipment 4 in the TTI NT. And transmitting the scheduling information of the user equipment 2 and the scheduling information of the user equipment 4 to the cell A2 and the cell B3, where the TTI N user equipment 4 acquired in the TTI NS is determined to be in the TTIN Retransmission user equipment that needs to be retransmitted.
  • the base station A sends an uplink grant UL Grant to the user equipment 4, wherein the new data in the UL Grant indicates that the NDI does not reverse, and the user equipment 4 performs adaptive retransmission according to the initial scheduling information of the user equipment 4.
  • T is 2-4 milliseconds
  • S is 1-2 milliseconds.
  • Step 405 The base station A is based on the measurement information of the user equipment 2, the scheduling information of the user equipment 2, the measurement information of the user equipment 5 of the cell A2 in the cell A1, the scheduling information of the user equipment 5, and the user equipment 6 of the cell B3 in the cell A1.
  • the measurement information in the measurement information of the user equipment 6 acquires the SINR prediction value of the user equipment 2.
  • the cell A1 allocates each resource block (RB) allocated by the user equipment 2 to the user equipment 5 of the received cell A2 and the user equipment of the cell B3.
  • the resource blocks in 6 are compared. If the resource block used by the A2 user equipment 5 in the cell also includes the resource block allocated by the user equipment 2, the user equipment 5 is set as the interference source of the user equipment 2 in the resource block in the cell A1. Similarly, if the cell The resource block used by the user equipment 6 in B3 also includes the resource block allocated by the user equipment 2, and the user equipment 6 is set as the interference source of the user equipment 2 in the resource block in the cell A1.
  • the source block includes an nth resource block (RB) 51, and the resource block allocated by the second user equipment in the second cell also includes the resource block n, and the resource block allocated by the third user equipment in the third cell is also included.
  • RB resource block
  • the third user equipment is the interference source of the second user equipment in the first cell.
  • the first cell may sort all the interference sources according to the strength of the signal, and select an interference source whose interference strength reaches a certain preset threshold or a preset number of interference sources.
  • the cell A1 of the base station A acquires the channel information of the user equipment 2 to the cell A1, the transmission power of the user equipment 2, the channel information of the user equipment using the same resource block to the user equipment 2 to the cell A1, and the same resource as the user equipment 2.
  • the SINR prediction value is calculated by the transmit power of the user equipment of the block and the interference noise estimate for the user equipment 2 other than the cell, the channel information including a channel response estimate.
  • the SINR prediction value of each subcarrier allocated for the user equipment may be calculated according to the formula (1.1a), and then the SINR prediction value of each subcarrier is combined into the SINR prediction value of the user equipment on the scheduling bandwidth. :
  • ⁇ n,j is the SINR on the RB n subcarrier j
  • p n,j is the transmit power of the user equipment on the RB n subcarrier j
  • w n,j is the signal of the user equipment on the RB n subcarrier j
  • the detection weight vector, h n,j is the channel response vector of the user equipment on the RB n subcarrier j
  • R zz,n,j is the interference noise covariance matrix
  • ( ⁇ ) H represents the conjugate transpose.
  • the SINR of the subcarriers is combined into SINR ⁇ n of the RB level, and then combined into the SINR prediction value of the user equipment, and the combining formula depends on the receiver used.
  • minimum mean square error Minimum Mean Square Error, MMSE
  • MMSE Minimum Mean Square Error
  • L is the number of merged set elements, that is, the number of subcarriers or the number of RBs.
  • the channel information of the user equipment 2 to the cell A1 when the channel information includes the reference signal received power and/or the reference signal received quality, the channel information of the user equipment 2 to the cell A1, the transmit power of the user equipment 2, and the same resource block used by the user equipment 2 may also be used.
  • the SINR historical measurement is corrected to calculate the SINR prediction value, as in equation (1.1b):
  • ⁇ measure (ts) represents the measured SINR historical value of ts, the reference signal received power and/or reference signal received quality by user equipment 2 to cell A1, the transmit power of user equipment 2, and the SINR history of user equipment 2
  • I(ts) represents the measured interference strength information of ts
  • I(t) represents the interference intensity information corresponding to the actual t-time prediction predicted at the current scheduling
  • ⁇ (t) is the currently maintained SINR correction weight, ⁇ ( t)>0.
  • the SINR prediction value is lowered. If the interference t is lower than the ts, the SINR prediction value is increased.
  • P(t) represents the transmission power spectrum of prediction t, and P(ts) represents the predicted transmission power spectrum corresponding to the tested ts.
  • the SINR of the subcarriers is combined into SINR ⁇ n of the RB level, and then combined into the SINR prediction value of the user equipment, and the combining formula depends on the receiver used. For example, the formula (1.2) is used for calculation.
  • DMRS Demodulation Reference Signal
  • SRS Sounding Reference Signal
  • the tracking history value can be used for estimation, thereby obtaining more accurate cooperative interference prediction.
  • the filtered value can be used as an estimated value of the residual interference noise outside the actual number of cells. For example, interference sources and background noise outside the coordinated cell set interfere with user equipment 2.
  • Step 406 Adjust the SINR value of the user equipment 2 according to the SINR prediction value and the SINR adjustment amount.
  • Step 407 Determine, according to the correspondence between the SINR and the MCS, the MCS corresponding to the SINR value of the user equipment 2.
  • the base station A uses the SINR adjustment value to query the correspondence between the SINR and the MCS, and selects the MCS that the user equipment 2 needs to use. Further, the cell A1 sends the selected MCS to the user equipment 2, so that the user equipment 2 adopts the modulation code represented by the MCS.
  • the method performs uplink data transmission. It should be noted that the correspondence between the SINR adjustment mechanism, the SINR, and the MCS is identical to the existing solution.
  • the 3GPP protocol defines a modulation scheme of MCS0 to MCS28 with 29 orders, which respectively represent different modulation modes and channel coding rate, and selects an appropriate MCS according to different channel conditions to maximize the throughput of the wireless communication system.
  • the interference source is determined according to multiple points of cooperation.
  • the coordinated multi-point of the user equipment 2 is the cell A1 and the cell A2
  • the interference source of the user equipment 2 includes not only the interfering user equipment for the cell A1 but also the interfering user equipment for the cell A2, on the resource block n
  • the user equipment 6 is not only the interference source of the user equipment 2 in the cell A1, but also the interference source of the user equipment 2 in the cell A2.
  • CoMP coordinated multi-point transmission refers to multiple transmission points separated geographically, and cooperates to jointly receive data sent by one terminal.
  • the cell A1 when the cell A1 receives the data demodulation error of the user equipment 2, it needs to wait for the received data of the coordinated neighboring area, and the received data of the coordinated neighboring area is delayed by T TTIs, which is equivalent to retransmission from 8 TTIs to 8 +T TTIs.
  • the user equipment 1 retransmits according to the resource blocks in the scheduling information acquired in the TTI N-T.
  • the base station A determines, at the TTI NT, the scheduling information of the user equipment 2 of the cell A1 in the TTI N, and obtains the information in the TTI N, the base station A.
  • the scheduling information of the user equipment determined by the cell A2 and the cell B3 in the TTIN-T and sent to the base station A can overcome the interference factor of the user equipment 2 of the cell A1 of the other user equipment pair in the non-ideal backhaul scenario.
  • the transmission delay considering the interference factors of the other user equipments on the user equipment 2, improves the accuracy of the base station calculating the SINR value of the user equipment 2 scheduled by the current cell, thereby selecting the MCS according to the SINR value, thereby improving the accuracy of the MCS selection, and further Increased wireless communication system throughput.
  • the base station A when T is equal to 0, that is, the cell A1 of the base station A acquires the scheduling information of the user equipment 5 of the cell A2, and the TTI NT is TTI N, and the base station A can determine the cell A1 at the TTI N.
  • the scheduling information of the user equipment 2 and the scheduling information of the user equipment 5 of the cell A2 are obtained, so that when the resource block of the user equipment 2 is the same as the resource block of the user equipment 5, the base station A acquires the measurement information of the user equipment 2 in the cell A1 and The measurement information of the user equipment 5 in the cell A1; the base station A acquires the user equipment 2 according to the measurement information of the user equipment 2 and the scheduling information of the user equipment 2 and the measurement information of the user equipment 5 in the cell A1 and the scheduling information of the user equipment 5.
  • the base station A obtains the SINR value of the user equipment 2 according to the SINR prediction value and the SINR adjustment amount; and the base station A determines the MCS corresponding to the SINR value of the user equipment 2 according to the correspondence between the SINR and the modulation and coding scheme MCS.
  • the detailed steps of predicting the SINR value are as described in the above embodiments.
  • the cell A1 may be the same base station as the cell A2, and the base station may directly acquire the scheduling information of the user equipment 5 of the cell A2.
  • An embodiment of the present invention provides a base station 50, as shown in FIG. 7, including:
  • the processing unit 501 is configured to determine, by the first base station, the transmission time interval TTI N-T Scheduling information of the first user equipment UE of the first cell in the TTI N, the scheduling information includes a resource block and a transmit power allocated to the first UE, where the first base station schedules the a first UE, where the first cell belongs to the first base station;
  • the obtaining unit 502 is configured to acquire scheduling information of the second UE of the second cell in the TTI, where the second cell belongs to the second base station, and the scheduling information of the second UE is The scheduling information of the second UE in the TTI, the scheduling information of the second UE is scheduling information that is determined by the second base station in the TTI NT and sent to the first base station;
  • the acquiring unit 502 is further configured to: when the resource block of the first UE is the same as the resource block of the second UE, the first base station acquires measurement information of the first UE in the first cell And measurement information of the second UE in the first cell;
  • the processing unit 501 is further configured to: according to the measurement information of the first UE, the scheduling information of the first UE, and the measurement information of the second UE in the first cell and the scheduling information of the second UE, Obtaining, by the first base station, a signal to interference plus noise ratio SINR predicted value of the first UE;
  • the processing unit 501 is further configured to: obtain, by the first base station, an SINR value of the first UE according to the SINR prediction value and an SINR adjustment amount;
  • the processing unit 501 is further configured to determine, by the first base station, the MCS corresponding to the SINR value of the first UE according to the correspondence between the SINR and the modulation and coding mode MCS.
  • the first base station determines scheduling information of the first UE of the first cell at TTI N, where the first base station acquires the second cell at the TTI NT and determines
  • the scheduling information of the second UE that is sent to the first base station can overcome the transmission delay of the interference factors of the other user equipments to the first UE in the non-ideal backhaul scenario, and consider the interference factors of other user equipments on the first UE.
  • the base station calculates the accuracy of the SINR value of the first UE scheduled by the current cell, and selects the MCS according to the SINR value, thereby improving the accuracy of the MCS selection, thereby improving the throughput of the wireless communication system.
  • the processing unit 501 is further configured to: at the TTI NS, the first base station acquires retransmission information of the third UE in the first cell, where the retransmission information includes the third UE
  • the feedback information of the retransmission of the second cell of the second cell is obtained by the first cell of the first base station, where the S is smaller than the T, and the T is a delay of obtaining the scheduling information of the second UE of the second cell by the first cell of the first base station;
  • the processing unit 501 is further configured to: at the TTI, the first base station determines that the third UE is not scheduled in the TTI N-T, and delays the third UE by one scheduling period scheduling.
  • the processing unit 501 is specifically configured to:
  • the first base station determines scheduling information of the third UE of the first cell at TTI N+8, at TTI N+8, The first base station sends an uplink grant UL Grant to the third UE, where the new data in the ULGrant indicates that the NDI does not reverse, so that the third UE performs retransmission in an adaptive retransmission manner.
  • the processing unit 501 is further configured to: at the TTI NS, the first base station acquires retransmission information of the third UE in the first cell, where the retransmission information includes the third The UE needs feedback information retransmitted in the TTI N;
  • the processing unit 501 is further configured to: at the TTI NT, the first base station determines scheduling information of the third UE of the first cell in the TTI N, where the T is acquired by the first cell of the first base station a delay of scheduling information of the second UE of the second cell;
  • the base station 50 further includes:
  • the sending unit 503 is configured to send, by the first base station, an uplink grant UL Grant to the third UE, where the new data in the UL Grant indicates that the NDI does not reverse, so that the third UE is used in the TTI Retransmission is performed using adaptive retransmission.
  • the processing unit 501 is specifically configured to:
  • the transmit power of the first UE the channel information of the second UE to the first cell, the transmit power of the second UE, and And calculating, by the first cell and the second cell, an interference noise estimate for the first UE, where the SINR prediction value is calculated, where the channel information includes a channel response estimate.
  • the SINR prediction value of each subcarrier allocated for the user equipment may be calculated according to the formula (1.1a), and then the SINR prediction value of each subcarrier is combined into the SINR prediction value of the user equipment on the scheduling bandwidth. :
  • the SINR of the subcarriers is combined into SINR ⁇ n of the RB level, and then combined into the SINR prediction value of the user equipment, and the combining formula depends on the receiver used.
  • minimum mean square error Minimum Mean Square Error, MMSE
  • MMSE Minimum Mean Square Error
  • the processing unit 501 is specifically configured to:
  • the resource block Obtaining, by the resource block, the channel information of the first UE to the first cell, the transmit power of the first UE, the SINR historical measurement value of the first UE, and the second UE to the Channel information of the first cell, transmit power of the second UE, and interference noise estimation for the first UE except the first cell and the second cell;
  • the channel information of the first UE to the first cell includes reference signal received power and/or reference signal received quality.
  • the SINR of the subcarriers is combined into SINR ⁇ n of the RB level, and then combined into the SINR prediction value of the user equipment, and the combining formula depends on the receiver used. For example, the formula (1.2) is used for calculation.
  • the embodiment of the present invention provides a base station 60, as shown in FIG. 9, including:
  • the processing unit 601 is configured to: at a transmission time interval TTI NT, the first base station determines scheduling information of the first user equipment UE of the first cell at TTI N, where the scheduling information includes resource blocks and transmissions allocated to the first UE Power, wherein, in the TTIN, the first base station schedules the first UE, and the first cell belongs to the first base station;
  • the processing unit 601 is further configured to: in the TTI NS, the first base station acquires retransmission information of the first UE in the first cell, where the retransmission information includes that the first UE needs to be in the TTI N retransmission feedback information;
  • the sending unit 602 is configured to send, by the first base station, an uplink grant UL Grant to the first UE, where the new data in the UL Grant indicates that the NDI does not be reversed, so that the first UE is used in the TTI Retransmission is performed using adaptive retransmission.
  • the first base station determines the scheduling information of the first UE of the first cell in the TTI N, and the first base station acquires the first UE in the first cell, in the TTI NS.
  • Retransmission information in the TTI N, the first base station may send an uplink grant UL Grant to the first UE, where new data in the UL Grant indicates that the NDI does not reverse, so that the first UE adopts
  • the transmission delay of acquiring interference factors of other user equipments to the first UE can be overcome, and the interference factors of other user equipments to the first UE are considered, and the base station calculation is improved.
  • the accuracy of the SINR value of the first UE scheduled by the current cell thereby selecting the MCS according to the SINR value, thereby improving the accuracy of the MCS selection, and further High wireless communication system throughput.
  • the embodiment of the present invention provides a base station 70, as shown in FIG. 10, including:
  • a memory 701 configured to store program code
  • the processor 702 configured to invoke the program code stored in the memory, to perform the following method: at a transmission time interval TTI NT, the first base station determines scheduling information of the first user equipment UE of the first cell at TTI N, where the scheduling information includes a resource block and a transmit power allocated to the first UE, where the first base station schedules the first UE, and the first cell belongs to the first base station;
  • the receiver 703 is configured to acquire scheduling information of the second UE of the second cell in the TTI, where the second cell belongs to the second base station, and the scheduling information of the second UE is The scheduling information of the second UE in the TTI, the scheduling information of the second UE is scheduling information that is determined by the second base station in the TTI NT and sent to the first base station;
  • the method performed by the processor 702 further includes:
  • the first base station acquires measurement information of the first UE in the first cell, and the second UE is in the Measuring information in the first cell;
  • the processor 702 is further configured to: according to the measurement information of the first UE and the scheduling information of the first UE, and the measurement information of the second UE in the first cell and the scheduling information of the second UE, Obtaining, by the first base station, a signal to interference plus noise ratio SINR predicted value of the first UE;
  • the processor 702 is further configured to: obtain, by the first base station, an SINR value of the first UE according to the SINR prediction value and an SINR adjustment amount;
  • the processor 702 is further configured to determine, by the first base station, the MCS corresponding to the SINR value of the first UE according to the correspondence between the SINR and the modulation and coding mode MCS.
  • the first base station determines scheduling information of the first UE of the first cell at TTI N, where the first base station acquires the second cell at the TTI NT and determines
  • the scheduling information of the second UE sent to the first base station can overcome the acquisition of other user equipments to the first UE in a non-ideal backhaul scenario.
  • the transmission delay of the interference factor considering the interference factor of the other user equipment to the first UE, improves the accuracy of the base station calculating the SINR value of the first UE scheduled by the current cell, thereby selecting the MCS according to the SINR value, and improving the MCS selection. Accuracy, which in turn increases the throughput of wireless communication systems.
  • the embodiment of the present invention provides a base station 80, as shown in FIG.
  • a memory 801 configured to store program code
  • the processor 802 configured to invoke the program code stored in the memory, to perform the following method: at a transmission time interval TTI NT, the first base station determines scheduling information of the first user equipment UE of the first cell at TTI N, where the scheduling information includes a resource block and a transmit power allocated to the first UE, where the first base station schedules the first UE, and the first cell belongs to the first base station;
  • the processor 802 is further configured to: in the TTI NS, the first base station acquires retransmission information of the first UE in the first cell, where the retransmission information includes that the first UE needs to be in the TTI N retransmission feedback information;
  • a transmitter 803 configured to send, by the first base station, an uplink grant UL Grant to the first UE, where the new data in the UL Grant indicates that the NDI does not reverse, so that the first UE is used in the TTI Retransmission is performed using adaptive retransmission.
  • the first base station determines the scheduling information of the first UE of the first cell in the TTI N, and the first base station acquires the first UE in the first cell, in the TTI NS.
  • Retransmission information in the TTI N, the first base station may send an uplink grant UL Grant to the first UE, where new data in the UL Grant indicates that the NDI does not reverse, so that the first UE adopts
  • the transmission delay of acquiring interference factors of other user equipments to the first UE can be overcome, and the interference factors of other user equipments to the first UE are considered, and the base station calculation is improved.
  • the accuracy of the SINR value of the first UE scheduled by the current cell, so that the MCS is selected according to the SINR value improves the accuracy of the MCS selection, and further improves the throughput of the wireless communication system.
  • the processor is also used to perform specific steps required for the user equipment to perform uplink data transmission, and reference may be made to the description of the method side.
  • Adaptive tuning according to the present invention The encoding method is applicable to scenes with a large number of users.
  • the disclosed 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 mutual 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 in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be 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.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé et un appareil de modulation et de codage adaptatifs, qui se rapportent au domaine de la communication sans fil, et peuvent améliorer la précision de sélection de MCS, ce qui améliore la capacité du système. À un TTI N-T, une première station de base détermine des informations d'ordonnancement à propos d'un premier équipement d'utilisateur (UE) d'une première cellule à un TTI N; au TTI N, la première station de base acquiert des informations d'ordonnancement concernant un deuxième UE d'une deuxième cellule; selon les informations de mesure à propos du premier UE, les informations d'ordonnancement à propos du premier UE, les informations de mesure à propos du deuxième UE dans la première cellule et les informations d'ordonnancement à propos du deuxième UE, la première station de base acquiert une valeur de prédiction de SINR du premier UE; la première station de base obtient une valeur de SINR du premier UE selon la valeur de prédiction de SINR et une quantité d'ajustement de SINR; et selon une corrélation entre un SINR et un schéma de modulation et de codage (MCS), la première station de base détermine le MCS correspondant à la valeur de SINR du premier UE. Le procédé et l'appareil de modulation et de codage adaptatifs sont utilisés pour la modulation et le codage adaptatifs.
PCT/CN2014/092057 2014-11-24 2014-11-24 Procédé et appareil de modulation et de codage adaptatifs WO2016082085A1 (fr)

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