WO2020001277A1 - Procédé, appareil et système de synchronisation de liaison montante - Google Patents

Procédé, appareil et système de synchronisation de liaison montante Download PDF

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Publication number
WO2020001277A1
WO2020001277A1 PCT/CN2019/090990 CN2019090990W WO2020001277A1 WO 2020001277 A1 WO2020001277 A1 WO 2020001277A1 CN 2019090990 W CN2019090990 W CN 2019090990W WO 2020001277 A1 WO2020001277 A1 WO 2020001277A1
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WIPO (PCT)
Prior art keywords
value
uplink
timing advance
uplink timing
adjustment
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PCT/CN2019/090990
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English (en)
Chinese (zh)
Inventor
王健
闫嘉川
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中兴通讯股份有限公司
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Publication of WO2020001277A1 publication Critical patent/WO2020001277A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the embodiments of the present application relate to, but are not limited to, the field of wireless communications, and in particular, to an uplink synchronization method, device, and system.
  • a base station receives a sounding reference reported by a user equipment (UE, User Equipment) Signal (SRS, Sounding Reference Signal) and demodulation reference signal (DMRS, Demodulation Reference Signal) to obtain the time adjustment value, and determine the uplink timing advance (TA, Timing, Advance) value according to the time adjustment value, the BS maps the TA value to where
  • the media access control unit (MAC, CE, Control, Control) of the cell sends a timing advance command (TAC, Timing Advance Command) to the UE using the MAC CE, and the UE receives the TAC to obtain uplink synchronization adjustment.
  • TAC Timing Advance Command
  • the BS In a radio resource control (RRC, Radio Resource Control) connected (RRC_CONNECTED) state, the BS needs to maintain a TA value.
  • RRC Radio Resource Control
  • the time when the uplink signal arrives at the BS may change with time, for example, the UE is in a high-speed moving state, the transmission path is switched, and the UE's crystal oscillator is shifted. Therefore, the UE needs to continuously update the TA value.
  • the BS uses MAC and CE to issue TAC.
  • the cycle is long and needs to wait for feedback.
  • the reason is that in the LTE system, the TA value is not adjusted frequently, and the TAC overhead is large, and frequent TAC is issued.
  • PDSCH Downlink physical shared channel
  • CP Cyclic Prefix
  • the UE moves the deviation of the TA value The value will be relatively large.
  • the TA value may jump over a wide range. Therefore, uplink synchronization needs to be performed more quickly and frequently. If the TAC is frequently sent in the MAC CE, the PDSCH resources will be wasted and the system efficiency will be reduced.
  • Embodiments of the present application provide an uplink synchronization method, device, and system.
  • An embodiment of the present application provides an uplink synchronization method, including:
  • the method further includes:
  • An embodiment of the present application proposes an uplink synchronization method, including:
  • An uplink timing advance value is determined according to the downlink control information, and an uplink synchronization adjustment is performed according to the uplink timing advance value.
  • the determining the uplink timing advance value according to the downlink control information includes:
  • An embodiment of the present application proposes an uplink synchronization device, including:
  • a determining module configured to determine an uplink timing advance value
  • the sending module is configured to send the uplink timing advance value to the first communication node using the downlink control information.
  • An embodiment of the present application proposes an uplink synchronization device, including:
  • a receiving module configured to receive downlink control information sent by a second communication node
  • the synchronization module is configured to determine an uplink timing advance value according to the downlink control information, and perform uplink synchronization adjustment according to the uplink timing advance value.
  • An embodiment of the present application provides an uplink synchronization device, including a processor and a computer-readable storage medium.
  • the computer-readable storage medium stores instructions. When the instructions are executed by the processor, any one of the foregoing is implemented.
  • An uplink synchronization method When the instructions are executed by the processor, any one of the foregoing is implemented.
  • An embodiment of the present application provides a computer-readable storage medium on which a computer program is stored.
  • the computer program is executed by a processor, the steps of any of the foregoing uplink synchronization methods are implemented.
  • An embodiment of the present application proposes an uplink synchronization system, including:
  • a second communication node configured to determine an uplink timing advance value; and using downlink control information to send an uplink timing advance value to the first communication node;
  • the first communication node is configured to receive downlink control information sent by the second communication node; determine an uplink timing advance value according to the downlink control information, and perform uplink synchronization adjustment according to the uplink timing advance value.
  • the embodiments of the present application include: determining an uplink TA value; and sending downlink control information (DCI, Downlink Control Information) to a first communication node.
  • DCI downlink control information
  • the embodiment of the present application uses DCI to send the uplink TA value, which does not occupy PDSCH resources, and can frequently send DCI to update the TA value, and realizes timely uplink synchronization without reducing system efficiency.
  • a MAC is used to send a TAC to the first communication node, and the TAC carries the uplink TA value.
  • the embodiment of the present application combines MAC CE and DCI to implement TA value update, that is, MAC value is used to coarsely adjust the TA value, and DCI is used to finely adjust the TA value, which improves the accuracy of updating the TA value.
  • FIG. 1 is a flowchart of an uplink synchronization method according to an embodiment of the present application
  • FIG. 2 is a flowchart of an uplink synchronization method according to another embodiment of the present application.
  • FIG. 3 is a schematic structural composition diagram of an uplink synchronization apparatus according to another embodiment of the present application.
  • FIG. 4 is a schematic structural composition diagram of an uplink synchronization apparatus according to another embodiment of the present application.
  • FIG. 5 is a schematic structural composition diagram of an uplink synchronization system according to another embodiment of the present application.
  • Example 6 is a schematic flowchart of Example 1 of an uplink synchronization method according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a MAC CE according to an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of an example 2 of an uplink synchronization method according to an embodiment of the present application.
  • FIG. 9 is a schematic flowchart of an example 3 of an uplink synchronization method according to an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of an example 4 of an uplink synchronization method according to an embodiment of the present application.
  • an embodiment of the present application provides an uplink synchronization method, including:
  • Step 100 Determine the uplink TA value.
  • a time adjustment value may be obtained by receiving measurement information reported by the first communication node, and performing filtering calculation according to the measurement information, and determining an uplink TA value according to the time adjustment value.
  • the measurement information can be obtained from the reported reference signals such as SRS and DMRS.
  • Measurement information such as channel state information includes modulation order (RI, Rank Indication) and signal-to-noise ratio (SINR, Signal to Interference plus Noise Ratio).
  • RI modulation order
  • SINR Signal to Interference plus Noise Ratio
  • Step 101 Use DCI to send an uplink TA value to the first communication node.
  • This embodiment of the present application uses DCI to send the uplink timing advance value, which does not occupy PDSCH resources, and can frequently send DCI to update the TA value, and implements uplink synchronization in a timely manner without reducing system efficiency.
  • any one of the following methods may be adopted to implement sending the uplink TA value to the first communication node by using DCI.
  • the uplink TA value is directly mapped into the DCI, and the DCI is sent to the first communication node.
  • the uplink TA value needs to be converted into an uplink TA adjustment value first, so that the uplink TA adjustment value It falls within the TA effective value range.
  • the uplink TA value is greater than or equal to the minimum value of the TA effective value range and less than or equal to the maximum value of the TA effective value range, determining that the uplink TA adjustment value is the uplink TA value;
  • the uplink TA adjustment value is the minimum value of the TA effective value range
  • the uplink TA adjustment value is the maximum value of the TA effective value range.
  • the mapping of the uplink TA adjustment value to the DCI includes:
  • Quantify the uplink TA adjustment value according to the adjustment step size that is, round the ratio of the uplink TA adjustment value to the adjustment step size as the quantized uplink TA adjustment value
  • Map the quantized uplink TA adjustment value to the uplink TA bit value specifically, map the quantized uplink TA adjustment value to the uplink TA bit value according to a predetermined mapping relationship; for example, use L bits to represent the uplink in DCI TA bit value, a specific value of L bit corresponds to a quantized uplink TA adjustment value, thereby forming a mapping relationship;
  • the DCI carries the uplink TA bit value.
  • DCI may be sent through a physical downlink control channel (PDCCH, Physical Downlink Control Channel).
  • PDCCH Physical Downlink Control Channel
  • the TAC field in the DCI may be used to carry the uplink TA bit value, and the TAC field may be a new field in the DCI or a reserved field in the multiplexed DCI.
  • the maximum coverage of the TAC field is 2 L ⁇ nTs, which is the difference between the maximum and minimum values of the TA effective value range, where Ts is the transmission interval and nTs is the adjustment step corresponding to DCI
  • the adjustment step size may be carried in the DCI or may not be carried in the DCI, that is, agreed in advance.
  • the maximum and minimum values of the TA effective value range can be pre-agreed or pre-configured (such as high-level signaling configuration), and can be determined according to the sending period of the uplink TA value in DCI and the occurrence probability of the uplink TA value in the sending period, even if It is obtained that the occurrence probability of the uplink TA value within the TA effective value range in the sending period exceeds a preset probability.
  • the uplink TA value does not exceed the TA effective value range. Therefore, it is not necessary to convert the uplink TA value into an uplink TA adjustment value, and it is only necessary to directly map the uplink TA value into the DCI.
  • the method for mapping the uplink TA value to the DCI is the same as the method for mapping the uplink TA adjustment value to the DCI, and details are not described herein again.
  • the method further includes:
  • the preset threshold may be a TA effective value range.
  • the method when the absolute value of the difference between the uplink TA value determined this time and the uplink TA value determined last time is greater than or equal to the preset threshold, the method further includes:
  • the MAC is used to send a TAC to the first communication node, and the TAC carries an uplink TA value.
  • the embodiment of the present application combines MAC CE and DCI to implement TA value update, that is, MAC value is used to coarsely adjust the TA value, and DCI is used to finely adjust the TA value, which improves the accuracy of updating the TA value.
  • the first number of bits and the second number of bits are the same, and the first adjustment step size and the second adjustment step size are the same;
  • the first number of bits and the second number of bits are the same, and the first adjustment step size and the second adjustment step size are different;
  • the first number of bits is different from the second number of bits, and the first adjustment step size is the same as the second adjustment step size;
  • the first bit number is different from the second bit number, and the first adjustment step size and the second adjustment step size are different;
  • the first number of bits is the number of bits occupied by the uplink TA value in the DCI
  • the second number of bits is the number of bits occupied by the uplink TA value in the MAC CE
  • the first adjustment step is the uplink TA value in the DCI.
  • the corresponding adjustment step size, and the second adjustment step size is the adjustment step size corresponding to the uplink TA value in the MAC CE.
  • an uplink synchronization method including:
  • Step 200 Receive the DCI sent by the second communication node.
  • Step 201 Determine an uplink TA value according to the DCI, and perform uplink synchronization adjustment according to the uplink TA value.
  • determining the uplink timing advance value according to the DCI includes:
  • the quantized uplink TA adjustment value is converted into the uplink TA value according to the adjustment step size, that is, the adjustment step size is multiplied by the quantized uplink TA adjustment value to obtain an uplink TA value.
  • the uplink TA value obtained by the first communication node is the aforementioned uplink TA adjustment value.
  • MAC uplink CE can be used to coarsely adjust the uplink TA value, and then DCI is used to fine-tune the uplink TA value, thereby improving the accuracy of updating the TA value.
  • determining the uplink timing advance value according to the DCI includes:
  • the quantized uplink TA value is converted into the uplink TA value according to the adjustment step size, that is, the adjustment step size is multiplied by the quantized uplink TA value to obtain an uplink TA value.
  • the method further includes:
  • the first communication node and the second communication node may be any communication nodes.
  • the first communication node may be a UE and the second communication node may be a base station.
  • an uplink synchronization apparatus including:
  • a determining module 301 configured to determine an uplink timing advance value
  • the sending module 302 is configured to send an uplink timing advance value to the first communication node using downlink control information.
  • the sending module 302 is configured to compare the uplink timing advance value determined this time with the uplink timing advance value determined last time, and when the uplink timing advance value determined this time and When the absolute value of the difference between the uplink timing advance values determined once is less than a preset threshold, the uplink control advance value is sent to the first communication node using the downlink control information.
  • the sending module 302 is further configured to: when an absolute value of a difference between the uplink timing advance value determined this time and the uplink timing advance value determined last time is greater than or equal to the preset threshold Using a media access control unit to send a timing advance command to the first communication node, where the timing advance command carries the uplink timing advance value.
  • the first bit number is the same as the second bit number, and the first adjustment step size is the same as the second adjustment step size;
  • the first number of bits and the second number of bits are the same, and the first adjustment step size and the second adjustment step size are different;
  • the first number of bits is different from the second number of bits, and the first adjustment step size is the same as the second adjustment step size;
  • the first bit number is different from the second bit number, and the first adjustment step size and the second adjustment step size are different;
  • the first number of bits is the number of bits occupied by the uplink timing advance value in the downlink control information
  • the second number of bits is the number of bits occupied by the uplink timing advance value in the media access control unit.
  • the first adjustment step size is an adjustment step size corresponding to the uplink timing advance value in the downlink control information
  • the second adjustment step size is the uplink timing advance value in the media access control unit The corresponding adjustment step size.
  • the sending module 302 is configured to determine an uplink timing advance adjustment value according to the uplink timing advance value
  • the sending module 302 is configured to determine the uplink timing advance adjustment value according to the uplink timing advance value in the following manner:
  • the uplink timing advance adjustment value is the uplink timing advance value when the uplink timing advance value is greater than or equal to the minimum value of the timing advance effective value range and less than or equal to the maximum value of the timing advance effective value range ;
  • the uplink timing advance value is smaller than the minimum value of the timing advance effective value range, determining that the uplink timing advance adjustment value is the minimum value of the timing advance effective value range;
  • the sending module 302 is configured to map the uplink timing advance adjustment value to the downlink control information in the following manner:
  • an uplink synchronization apparatus including:
  • the receiving module 401 is configured to receive downlink control information sent by a second communication node
  • the synchronization module 402 is configured to determine an uplink timing advance value according to the downlink control information, and perform uplink synchronization adjustment according to the uplink timing advance value.
  • the synchronization module 402 is configured to map the uplink timing advance bit value carried in the downlink control information to the uplink timing advance bit value according to a mapping relationship between the uplink timing advance bit value and the quantized uplink timing advance adjustment value.
  • a quantized uplink timing advance adjustment value converts the quantized uplink timing advance adjustment value to the uplink timing advance value according to an adjustment step; and performs uplink synchronization adjustment according to the uplink timing advance value.
  • an uplink synchronization device including a processor and a computer-readable storage medium, where the computer-readable storage medium stores instructions, and when the instructions are executed by the processor, the foregoing is implemented. Either uplink synchronization method.
  • Another embodiment of the present application provides a computer-readable storage medium on which a computer program is stored.
  • the computer program is executed by a processor, the steps of any one of the foregoing uplink synchronization methods are implemented.
  • Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, magnetic tape, magnetic disk storage or other magnetic storage devices, or may Any other medium used to store desired information and which can be accessed by a computer.
  • an uplink synchronization system including:
  • the second communication node 501 is configured to determine an uplink timing advance value; and send the uplink timing advance value to the first communication node using downlink control information;
  • the first communication node 502 is configured to receive downlink control information sent by the second communication node; determine an uplink timing advance value according to the downlink control information, and perform uplink synchronization adjustment according to the uplink timing advance value.
  • the BS sends an uplink TA value to the UE through DCI.
  • the method includes:
  • Step 600 The BS receives the measurement information reported by the UE in the local cell, obtains a time adjustment value through filtering calculation, and determines an uplink TA value according to the time adjustment value.
  • the measurement information includes at least one of the following: SRS, DMRS.
  • Step 601 The BS adjusts the uplink TA value according to a TA effective value range corresponding to the TAC field of the DCI of the cell in which the BS determines the uplink TA adjustment value.
  • the TAC field may be a new field in DCI or a reserved field in DCI.
  • the uplink TA adjustment value is the minimum value of the TA effective value range
  • the uplink TA adjustment value is the maximum value of the TA effective value range.
  • the length of the TAC field in DCI is L bits, and the adjustment step corresponding to DCI is nTs.
  • the maximum coverage of the TAC field in DCI is 2 L ⁇ nTs, which is the minimum value of the effective value range of TA, T2. for The maximum value T1 is
  • Step 602 The BS maps the determined uplink TA adjustment value to the TAC field of the DCI of the cell.
  • the uplink TA adjustment value is quantized according to the adjustment step size, that is, the ratio of the uplink TA adjustment value and the adjustment step size is rounded as the quantized uplink TA adjustment value;
  • Map the quantized uplink TA adjustment value to an uplink TA bit value specifically, map the quantized uplink TA adjustment value to an uplink TA bit value according to a predetermined mapping relationship; for example, the TAC field in DCI uses L bits To represent the uplink TA bit value. A specific value of the L bit corresponds to a quantized uplink TA adjustment value, thereby forming a mapping relationship.
  • Step 603 The BS sends the DCI including the TAC field to the UE through the PDCCH.
  • Step 604 The UE receives the DCI, parses the TAC field in the DCI, converts the uplink TA bit value in the TAC field into an uplink TA value, and performs uplink synchronization adjustment according to the uplink TA value.
  • the TAC field in the DCI carries the uplink TA bit value and sends it to the first communication node. Specifically, the DCI is sent through the PDCCH.
  • the UE first converts the uplink TA bit value in the TAC field into a quantized uplink TA adjustment value, and uses the product of the uplink TA adjustment value and the adjustment step size corresponding to the DCI as the uplink TA value.
  • the MAC CE transmission cycle is large and cannot meet the requirement for fast uplink synchronization.
  • the TAC occupation field in the MAC CE is long. If it is frequently transmitted, PDSCH resources will be wasted and system throughput will be reduced.
  • the uplink TA value is measured in this embodiment of the present application, the measured uplink TA value may exceed the data range that can be represented by the TAC field in the DCI. Therefore, the obtained uplink TA adjustment value needs to be adjusted to meet the data range corresponding to the TAC field in the DCI. ; Then, the adjusted uplink TA adjustment value needs to be mapped into the TAC field of the DCI of the cell, and then sent to the UE through the PDCCH.
  • This method uses the DCI to send the uplink TA value instead of the MAC CE, while not occupying the PDSCH resources, it satisfies the requirement for frequent sending of the uplink TA value, and improves the system throughput.
  • This example can be applied to a 5G New Radio (NR, New Ratio) high frequency fixed wireless access (FWA, Fixed Wireless Access) scenario, in which the MAC, CE, and DCI are used to send an uplink TA value to the UE.
  • NR New Radio
  • FWA Fixed Wireless Access
  • the UE has fixed access.
  • the uplink TA value fluctuates slightly.
  • the MAC CE is used to send the uplink TA value to the UE. Due to the large step size of the MAC CE adjustment, it is difficult to perform uplink TA in a small range. The value fluctuation is adjusted.
  • the MAC CE structure used to send the uplink TA value is shown in Figure 7, where 2 bits are used as reserved fields, and the remaining 6 bits are used to send the TAC carrying the uplink TA value, which corresponds to the uplink TA value index. The range is 0 to 63.
  • beam switching may cause a sudden change in the uplink TA value.
  • Only the DCI is used to send the uplink TA value.
  • the number of bits allocated by DCI and the small step size adjustment implementation scheme are difficult to cover the sudden change in the uplink TA value caused by the beam switching.
  • MAC CE is used to adjust the step size of the large-scale uplink TA value caused by beam switching, and DCI is used to fine-tune the small-scale fluctuation of uplink TA value in the FWA scene to obtain more For reliable link performance.
  • the method includes:
  • Step 800 The BS receives the measurement information reported by the UE in the local cell, obtains a time adjustment value through filtering calculation, and determines an uplink TA value according to the time adjustment value.
  • the measurement information includes at least one of the following: SRS, DMRS.
  • Step 801 The BS judges whether the absolute value of the difference between the determined uplink TA value and the last determined uplink TA value is greater than or equal to a preset threshold. When the determined uplink TA value and the last determined uplink TA value are between When the absolute value of the difference is less than the preset threshold, perform steps 802 to 805; when the absolute value of the difference between the determined uplink TA value and the last determined uplink TA value is greater than or equal to the preset threshold, perform steps 806 to Step 807.
  • the fluctuation range of the uplink TA value is considered to be large, causing the fluctuation range of the uplink Ta value
  • the larger cause may be beam switching; or, the uplink TA value sent by the MAC CE last time does not take effect. In this case, the MAC CE needs to be coarsely adjusted once to obtain preliminary uplink synchronization.
  • Step 802 The BS adjusts the uplink TA value according to the TA effective value range corresponding to the TAC field of the DCI of the cell in which the BS determines the uplink TA adjustment value.
  • the TAC field may be a new field in DCI or a reserved field in DCI.
  • the uplink TA adjustment value is the minimum value of the TA effective value range
  • the uplink TA adjustment value is the maximum value of the TA effective value range.
  • the length of the TAC field in DCI is L bits, and the adjustment step corresponding to DCI is nTs.
  • the maximum coverage of the TAC field in DCI is 2 L ⁇ nTs, which is the minimum value of the effective value range of TA, T2. for The maximum value T1 is
  • Step 803 The BS maps the determined uplink TA adjustment value to the TAC field of the DCI of the cell.
  • the uplink TA adjustment value is quantized according to the adjustment step size, that is, the ratio of the uplink TA adjustment value and the adjustment step size is rounded as the quantized uplink TA adjustment value;
  • Map the quantized uplink TA adjustment value to an uplink TA bit value specifically, map the quantized uplink TA adjustment value to an uplink TA bit value according to a predetermined mapping relationship; for example, the TAC field in DCI uses L bits To represent the uplink TA bit value. A specific value of the L bit corresponds to a quantized uplink TA adjustment value, thereby forming a mapping relationship.
  • Step 804 The BS sends the DCI including the TAC field to the UE through the PDCCH.
  • Step 805 The UE receives DCI, parses the TAC field in the DCI, converts the uplink TA bit value in the TAC field into an uplink TA value, and performs uplink synchronization adjustment according to the uplink TA value.
  • the TAC field in the DCI carries the uplink TA bit value and sends it to the first communication node. Specifically, the DCI is sent through the PDCCH.
  • the UE first converts the uplink TA bit value in the TAC field into a quantized uplink TA adjustment value, and uses the product of the uplink TA adjustment value and the adjustment step size corresponding to the DCI as the uplink TA value.
  • Step 806 The BS sends a TAC to the first communication node using the MAC CE, and the TAC carries an uplink TA value.
  • Step 807 The BS waits for the UE feedback message, and the base station makes corresponding adjustments to the historical filter value according to the UE feedback message, and starts to receive the measurement information reported by the UE, that is, it proceeds to step 800.
  • the TAC field in the DCI and the TAC field in the MAC CE maintain the same number of bits, and adjust the uplink synchronization of the UE by an adjustment step smaller than the adjustment step corresponding to the MAC CE to achieve fine adjustment.
  • the motion path is direct to reflection, and there are a large number of UEs connected, only using MAC CE to send the uplink TA value to the UE, it needs to occupy too much PDSCH resources, and the overhead load is too large; Only use the DCI to send the uplink TA value to the UE. If the UE moves fast, or the uplink TA value fluctuates rapidly and is caused by other reasons, more bits need to be allocated in the DCI to send the uplink TA value to cover the uplink. The fluctuation range of the TA value.
  • the MAC CE and the DCI use different bit numbers to send the uplink TA value to the UE with the same adjustment step. As shown in Figure 9, the method includes:
  • Step 900 The BS receives the measurement information reported by the UE in the local cell, obtains a time adjustment value through filtering calculation, and determines an uplink TA value according to the time adjustment value.
  • the measurement information includes at least one of the following: SRS, DMRS.
  • Step 901 The BS judges whether the absolute value of the difference between the determined uplink TA value and the last determined uplink TA value is greater than or equal to a preset threshold. When the determined uplink TA value and the last determined uplink TA value are When the absolute value of the difference is less than the preset threshold, perform steps 902 to 905; when the absolute value of the difference between the determined uplink TA value and the last determined uplink TA value is greater than or equal to the preset threshold, perform steps 906 to Step 907.
  • the fluctuation range of the uplink TA value is considered to be large, causing the fluctuation range of the uplink Ta value.
  • the larger reason may be beam switching; or, the uplink TA value sent by the MAC CE last time does not take effect. In this case, the MAC CE needs to be coarsely adjusted once to obtain preliminary uplink synchronization.
  • Step 902 The BS adjusts the uplink TA value according to the TA effective value range corresponding to the TAC field of the DCI of the cell in which the BS determines the uplink TA adjustment value.
  • the TAC field may be a new field in DCI or a reserved field in DCI.
  • the uplink TA adjustment value is the minimum value of the TA effective value range
  • the uplink TA adjustment value is the maximum value of the TA effective value range.
  • the length of the TAC field in DCI is L bits, and the adjustment step corresponding to DCI is nTs.
  • the maximum coverage of the TAC field in DCI is 2 L ⁇ nTs, which is the minimum value of the effective value range of TA, T2. for The maximum value T1 is
  • Step 903 The BS maps the determined uplink TA adjustment value to the TAC field of the DCI of the cell.
  • the uplink TA adjustment value is quantized according to the adjustment step size, that is, the ratio of the uplink TA adjustment value and the adjustment step size is rounded as the quantized uplink TA adjustment value;
  • Map the quantized uplink TA adjustment value to an uplink TA bit value specifically, map the quantized uplink TA adjustment value to an uplink TA bit value according to a predetermined mapping relationship; for example, the TAC field in DCI uses L bits To represent the uplink TA bit value. A specific value of the L bit corresponds to a quantized uplink TA adjustment value, thereby forming a mapping relationship.
  • Step 904 The BS sends the DCI including the TAC field to the UE through the PDCCH.
  • Step 905 The UE receives the DCI, parses the TAC field in the DCI, converts the uplink TA bit value in the TAC field into an uplink TA value, and performs uplink synchronization adjustment according to the uplink TA value.
  • the TAC field in the DCI carries the uplink TA bit value and sends it to the first communication node. Specifically, the DCI is sent through the PDCCH.
  • the UE first converts the uplink TA bit value in the TAC field into a quantized uplink TA adjustment value, and uses the product of the uplink TA adjustment value and the adjustment step size corresponding to the DCI as the uplink TA value.
  • Step 906 The BS sends a TAC to the first communication node using the MAC CE, where the TAC carries an uplink TA value.
  • Step 907 The BS waits for the UE feedback message, and the base station makes corresponding adjustments to the historical filter value according to the UE feedback message, and starts to receive the measurement information reported by the UE, that is, it proceeds to step 800.
  • the TAC field in DCI and the TAC field in MAC CE use different numbers of bits to guide the uplink arrival time of the UE with the same step size.
  • the CP is short, and the UE is susceptible to synchronization. It is too wasteful to use PDSCH to frequently send TAC using MAC CE, and TAC is sent periodically using MAC CE. Because of the short CP characteristics at high frequencies, Before the period arrives, the UE may lose synchronization. Therefore, MAC can be used to periodically send TAC, and within the period, DCI is used to send TAC.
  • the TAC field of DCI contains the adjustment step size, and the adjustment step size is optional. It can realize the adaptive adjustment of the UE. When the uplink TA value fluctuates greatly, the BS allocates a relatively large step size to the UE, and conversely, the BS allocates a relatively small step size to the UE.
  • the method includes:
  • Step 1000 The BS receives the measurement information reported by the UE in the local cell, obtains a time adjustment value through filtering calculation, and determines an uplink TA value according to the time adjustment value.
  • the measurement information includes at least one of the following: SRS, DMRS.
  • Step 1001 The BS issues a TAC using the MAC CE, and the TAC carries an uplink TA value.
  • the MAC CE adjusts the UE using a large step size.
  • Step 1002 The BS judges whether the MAC CE delivery cycle is reached. If the MAC CE delivery cycle is reached, then step 1000 is continued; if the MAC CE delivery cycle is not reached, step 1003 is continued.
  • Step 1003 The BS uses the DCI to deliver the uplink TA value.
  • the number of bits used to carry the uplink TA value allocated by the TAC field in the DCI is less than the number of bits used to carry the uplink TA value in the MAC CE.
  • the long adjustment step length corrects the uplink arrival time of the UE.
  • two bits are reserved in the TAC field in the DCI to indicate the adjustment step size used for the uplink TA value issued by the DCI, that is, the value delivered by the DCI.
  • the adjustment step of the uplink TA value is variable.

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

Abstract

L'invention concerne un procédé, un appareil et un système de synchronisation de liaison montante. Le procédé de synchronisation de liaison montante consiste à : déterminer une valeur d'avance temporelle de liaison montante (TA) ; et transmettre la valeur TA de liaison montante à un premier nœud de communication au moyen d'informations de commande de liaison descendante (DCI).
PCT/CN2019/090990 2018-06-26 2019-06-12 Procédé, appareil et système de synchronisation de liaison montante WO2020001277A1 (fr)

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