WO2017132960A1 - Procédé de transmission de signal montant, équipement utilisateur (ue) et station de base - Google Patents

Procédé de transmission de signal montant, équipement utilisateur (ue) et station de base Download PDF

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Publication number
WO2017132960A1
WO2017132960A1 PCT/CN2016/073564 CN2016073564W WO2017132960A1 WO 2017132960 A1 WO2017132960 A1 WO 2017132960A1 CN 2016073564 W CN2016073564 W CN 2016073564W WO 2017132960 A1 WO2017132960 A1 WO 2017132960A1
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Prior art keywords
time point
sending
cca
transmission time
uplink signal
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PCT/CN2016/073564
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English (en)
Chinese (zh)
Inventor
杨美英
李�远
官磊
马莎
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201680081189.9A priority Critical patent/CN108605357A/zh
Priority to PCT/CN2016/073564 priority patent/WO2017132960A1/fr
Publication of WO2017132960A1 publication Critical patent/WO2017132960A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access

Definitions

  • the present invention relates to the field of communications, and in particular, to a method for transmitting an uplink signal, a UE, and a base station.
  • the spectrum includes unlicensed spectrum and licensed spectrum.
  • the resource is larger than the licensed spectrum resource.
  • a variety of wireless communication systems coexist on the unlicensed spectrum, for example, LAA (Licensed-Assisted Access) and Wi-Fi coexist in the 5 GHz band.
  • LAA Licensed-Assisted Access
  • Wi-Fi coexist in the 5 GHz band.
  • LBT Listen Before Talk
  • the LAA UL (uplink) transmission generally uses multi-user scheduling.
  • the UE transmits uplink data based on the scheduling of the eNB.
  • the UE needs to listen to the wireless channel before transmitting the uplink data. Only the UE that is scheduled by the eNB and whose channel listening result is idle can perform signal transmission.
  • the LBT mechanism and parameters of the UEs participating in the channel competition are different, and/or the channel propagation conditions are different, which may cause different UEs to send uplink data at different times, so that the UE that sends the first will
  • the UE that is sent later causes interference, so that the channel sounding result of the UE that is transmitted later is busy, so that uplink data transmission cannot be performed, and the UEs interfere with each other.
  • Embodiments of the present invention provide a method for transmitting an uplink signal, a UE, and a base station, which reduce mutual interference caused when different UEs simultaneously transmit uplink signals.
  • a method for transmitting an uplink signal including:
  • the base station determines a first transmission time point for the user equipment UE in the set of candidate transmission time points.
  • the first sending time point is that the UE sends the current uplink message earliest The time of the number.
  • the time point at which the current uplink signal is sent earliestly refers to the earliest time point at which the UE allows to transmit the current uplink signal.
  • the UE does not allow the uplink signal to be sent even if the CCA succeeds before the first transmission time point, but waits until the first transmission time point sends the current uplink signal or sends the current between the first transmission time point and the second transmission time point.
  • the second transmission time point here is after the first transmission time point, and is a transmission time point at which the UE sends the useful signal in the current uplink signal.
  • the first transmission time point belongs to a candidate transmission time point set
  • the candidate transmission time point set includes at least two candidate transmission time points, that is, the first transmission time point has multiple possibilities.
  • the base station determines the first sending time point according to the time when the reference UE sends the uplink signal. Specifically, the LBT parameters of each scheduled UE (such as a random backoff initial value, a random backoff amplitude value, and a random backoff start time) are recorded, so the base station can determine that each scheduled UE completes the CCA (clear) Channel assessment, the measurement of the clearance channel (the random backoff initial value minus zero), can determine that a UE that has completed the CCA random backoff is the reference UE, and refers to the first time point.
  • the LBT parameters of each scheduled UE such as a random backoff initial value, a random backoff amplitude value, and a random backoff start time
  • the time point at which the reference UE completes the CCA random backoff is such that the first transmission time point is as close as possible to the time point at which the reference UE completes the CCA random backoff.
  • the base station can determine the time point at which the reference UE obtains the channel usage right and immediately transmits the uplink signal, and can determine the first transmission time point of the earliest uplink signal to be sent to other UEs scheduled according to the time point at which the reference UE sends the uplink signal.
  • the actual transmission time point at which the UE sends the uplink signal is as close as possible to the time point at which the reference UE transmits the uplink signal, so that each UE is aligned as possible.
  • the base station further determines a second transmission time point; the second transmission time point is a transmission time point of the useful signal in the current uplink signal, and the second transmission time point is not earlier than the first transmission time point.
  • the useful signal here refers to the effective information that the UE actually transmits to the base station, and does not include the padding information.
  • the second transmission time point can be understood as the time point that the UE determines that the UE sends the current uplink signal, but may not be the time point when the UE actually sends the current uplink signal.
  • the base station sends a notification message to the UE to indicate the first sending time.
  • the UE sends the current uplink signal according to the first sending time point and the second sending time point. It should be noted that if the base station indicates the first transmission time point by using the notification information, the UE determines the second transmission time point, and acquires the first transmission time point according to the notification information.
  • the base station receives the current uplink signal sent by the UE from the second sending time point.
  • the UE does not necessarily send the current uplink signal at the second transmission time point, the base station must start receiving the uplink signal at the second transmission time point.
  • the time point at which the UE transmits an uplink signal depends on the time indicated by the base station scheduling the UL scheduling information (ie, UL grant) of the UE.
  • the base station n transmits UL scheduling information at a time
  • the UE transmits the UL signal at time n+k.
  • the UE In the LAA, after the base station transmits the UL scheduling information, the UE also needs to listen to the used channel, and judges whether the channel usage right is obtained according to the result of the channel listening.
  • the UE can only send an uplink signal after the UE is scheduled by the base station and the channel usage right is obtained. Therefore, the existing LTE uplink scheduling does not indicate the moment when the UE actually transmits the uplink signal.
  • the UE because the channel conditions of the scheduled UEs are different, and the LBT parameters are different, the time at which each UE sends the uplink signal is different. Therefore, the UE may perform channel measurement when other UEs occupy the channel, and the UE considers that the channel is unavailable.
  • the uplink signal is not transmitted at the time of uplink signal transmission, thereby causing mutual interference between UEs that are not simultaneously transmitted.
  • the base station may determine a first transmission time point at which the UE can transmit the current uplink signal, and a second transmission time point at which the UE sends the useful signal in the current uplink signal, and indicate to the UE the first transmission time point and/or
  • the second transmission time point is such that the UE determines the actual transmission time point of the current uplink signal according to the first transmission time point and the second transmission time point, that is, the UE adjusts the actual transmission time point according to the indication of the base station, so that the first time determined by the base station Sending time point close to the reference UE to complete the CCA random return
  • the time point of the retreat so the actual transmission time point of the current uplink signal determined by the UE according to the first transmission time point and the second transmission time point is also the time point at which the CCA random backoff is completed near the reference UE, so that each UE can be indicated as much as possible.
  • uplink signal transmission is performed to reduce mutual interference between UEs.
  • the candidate transmission time point is a time point at which the current uplink signal is sent immediately after the detection in the CCA time window is successful, and a pre-configured first time point is sent after the CCA time window is successfully detected. And sending any one of the pre-configured second time points of the current uplink time after the detection in the CCA time window is successful.
  • the UE may perform a random backoff (backoff counter reduction) of the CCA in the CCA time window, or may perform channel sensing with a one shot duration.
  • the pre-configured first time point may be a time point immediately after the self-defer is sent after the CCA time window is successfully detected, and the pre-configured second time point may be after the padding is performed after the CCA time window is successfully detected.
  • the time point of immediate transmission, in short, the first time point is different from the second time point.
  • immediate transmission is used to illustrate that if the time point of the random backoff of the CCA is successful at the sub-frame (or symbol) boundary, the so-called immediate transmission starts from the subframe boundary (or symbol boundary); if CCA The time of successful random backoff is not at the sub-frame (or symbol) boundary, and can be started by self-rewinding to this sub-frame boundary (or symbol boundary).
  • the first preset duration and the second preset duration may be relative times, for example, the start time is the first symbol of the nth subframe, and the duration is 0.5 us. It may also be an absolute time, for example, the start time is the first symbol of the nth subframe, and the end time is the fifth symbol of the nth subframe.
  • the UE may perform padding (ie, send a padding signal to the base station), or may perform a self-defer operation, which may or may not listen to the channel.
  • the CCA can be padded for a certain period of time during the random backoff process, or it can be a complete uninterrupted random backoff process.
  • the method further includes:
  • the base station sends contention window information to the UE, the contention window information is used to indicate a fallback initial value, and the backoff initial value is used for random backoff of the idle channel assessment.
  • the UE determines a fallback initial value according to the contention window information, and performs a random backoff of the idle channel assessment CCA.
  • the UE may determine a fallback initial value according to the contention window information. For example, the base station and the UE maintain the same contention window, and the contention window includes four back-off initial values, which are represented by 00, 01, 10, and 11, respectively, where 00, 01, 10, and 11 are contention window information, if the base station If the indication is 00, the UE may determine its corresponding initial value of the backoff according to 00.
  • the base station and the UE maintain the correspondence between the contention window information and the initial value in advance, for example, the initial values of the backoff corresponding to 00, 01, 10, and 11, respectively.
  • the corresponding relationship maintained by the two is the same, and the same contention window information corresponds to the same backoff initial value at both the base station and the UE.
  • the base station sends the fallback initial value to the UE, where the fallback initial value is used for random backoff of the idle channel assessment.
  • the UE may perform random backoff of the idle channel assessment CCA according to the backoff initial value.
  • the UE starts to perform CCA on the channel at a specific time (which may be indicated by the base station), and once the measured signal strength value is lower than the threshold, the initial value of the fallback is subtracted.
  • a certain value (the above-mentioned back-off amplitude value), continue to CCA, and measure that the signal strength value is lower than the threshold value and continue to subtract a certain value, so reciprocating until the initial value of the retreat is reduced to zero.
  • the method further includes:
  • a method for transmitting an uplink signal including:
  • the UE acquires a first transmission time point, where the first transmission time point is a time point at which the UE first sends a current uplink signal, and the first transmission time point belongs to a candidate transmission time point set, and the candidate transmission time point
  • the set includes at least two candidate transmission time points.
  • the time point at which the current uplink signal is sent earliestly refers to the earliest time point at which the UE allows to transmit the current uplink signal.
  • the UE is before the first transmission time point If the CCA is successful, the uplink signal is not allowed to be sent, but the current uplink signal is sent at the first transmission time point or the current uplink signal is sent between the first transmission time point and the second transmission time point.
  • the second transmission time point here is after the first transmission time point, and is a transmission time point at which the UE sends the useful signal in the current uplink signal.
  • the second transmission time point may be obtained by the UE according to the indication of the base station, or may be a time point that is customary in the LTE system, such as a subframe boundary, a symbol boundary, and the like.
  • the UE is to perform a CCA operation with an uplink channel
  • the UE determines an actual transmission time point of the current uplink signal according to the first sending time point and the result of the CCA operation.
  • the actual transmission time point that is, the time point at which the UE actually performs uplink transmission, may be earlier than the time point at which the UE transmits the useful signal in the current uplink signal.
  • the candidate transmission time point is a time point at which the current uplink signal is sent immediately after the detection in the CCA time window is successful, and a pre-configured first time point is sent after the CCA time window is successfully detected. And sending any one of the pre-configured second time points of the current uplink time after the detection in the CCA time window is successful.
  • the UE may perform a random backoff (backoff counter reduction) of the CCA in the CCA time window, or may perform channel sensing with a one shot duration.
  • the pre-configured first time point may be a time point immediately after the self-defer is sent after the CCA time window is successfully detected, and the pre-configured second time point may be after the padding is performed after the CCA time window is successfully detected.
  • the time point of immediate transmission, in short, the first time point is different from the second time point.
  • the first transmission time point is a time point determined by the base station to transmit the current uplink signal
  • the UE determines the actual transmission time point of the current uplink signal according to the first transmission time point and the result of the CCA operation, that is, the UE according to the base station.
  • the indication adjusts the actual transmission time point.
  • the first transmission time point determined by the base station is close to the reference UE to complete the CCA random backoff time (that is, the channel usage right is obtained to immediately send the uplink signal) Therefore, the actual transmission time point of the current uplink signal determined by the UE according to the first transmission time point and the second transmission time point is also a time point when the reference UE completes the CCA random backoff, so that each UE can be instructed as much as possible.
  • uplink signal transmission is performed to reduce mutual interference between UEs.
  • the method further includes:
  • the second sending time point is a sending time point of the useful signal in the current uplink signal; and the second sending time point is not earlier than the first sending time point, And the second transmission time point may be after the actual transmission time point of the UE.
  • the performing, by the UE, the performing CCA operation by using the uplink channel includes:
  • the UE determines a fallback initial value, and performs a random backoff of the CCA according to the fallback initial value.
  • the so-called random backoff of CCA that is, the UE performs channel interception for a certain period of time, and when the channel is idle, the initial value of the back-off of the counter is subtracted by a certain value, and so on, until the initial value of the back-off is reduced to zero, that is, the UE Obtain channel usage rights.
  • Determining, by the UE, the actual sending time point of the current uplink signal according to the first sending time point and the result of the CCA operation including:
  • the UE determines an actual transmission time point of the current uplink signal according to the first sending time point and the second sending time point and the result of the random backoff.
  • Determining, by the UE, the actual sending time point of the current uplink signal according to the first sending time point, the second sending time point, and the result of the random backing specifically:
  • the UE determines that the actual sending time point is not earlier than the first sending time point. That is, the UE randomly rolls back successfully before the first transmission time point (ie, The machine backoff initial value is reduced to zero), and the time transmission time point is at least after the first transmission time point, and preferably, the time transmission time point is the first transmission time point.
  • the UE determines that the actual sending time point is not earlier than The time point at which the random backoff is successful is not later than the second sending time point. That is to say, the UE randomly returns randomly between the first sending time point and the second sending time point, and the time sending time point is between the time point when the random backing succeeds and the second sending time point.
  • the UE receives the contention window information sent by the base station, and determines the fallback initial value according to the contention window information; the contention window information is used to indicate the fallback initial value;
  • the UE receives the initial value of the backoff sent by the base station
  • the UE acquires contention window information, and determines the fallback initial value according to the contention window information.
  • the acquiring, by the UE, the first sending time point specifically includes:
  • the UE receives the notification message sent by the base station, and obtains the first sending time point and the second sending time point according to the notification message.
  • the UE receives the notification message sent by the base station, and obtains the first sending time point and the second sending time point according to the notification message.
  • the notification message may carry the first transmission time point and the second transmission time point, and the UE parses the notification message today, and acquires the first transmission time point and the second transmission time point; or, the notification And the indication information indicating the first sending time point and the second sending time point carried by the message, the UE acquiring the notification message according to the indication information to carry the first sending time point and the second sending time point.
  • the notification message carries the first sending time point, and the UE parses the notification message to obtain the first sending time point;
  • the notification information carried in the message indicating the first sending time point the UE acquires the first sending time point according to the indication information, and the UE determines the second sending time point by itself, and the second sending time point may be a subframe.
  • the LTE system such as the boundary (or symbol boundary) is scheduled to be a common point in time.
  • the method further includes:
  • the UE determines that the actual transmission time point is earlier than the second transmission time point, the UE sends the current uplink signal between the actual transmission time point and the second transmission time point. And filling a signal, sending the useful signal in the current uplink signal from the second transmission time point.
  • the content of the padding signal is not limited, and the sequence, the reference signal, the data information, and the like may be transmitted.
  • the padding signal is sent between the actual transmission time point and the second transmission time point because the UE actually determines the actual transmission time point according to the indication of the base station. Before the second transmission time point, in order to avoid interference caused by the CCA result of other UEs, the UE needs to occupy the channel from the actual transmission time point, but the actual transmission time point is different from the second transmission time point here, so the useful signal cannot be transmitted.
  • the channel can be occupied by sending a padding signal padding.
  • the performing, by the UE, the performing CCA operation by using the uplink channel specifically includes:
  • the UE performs CCA in a first CCA time window before the first sending time point;
  • Determining, by the UE, the actual sending time point of the current uplink signal according to the first sending time point and the result of the CCA operation including:
  • the UE determines that the actual transmission time point is the first transmission time point.
  • the to-be-used uplink channel is idle, and the channel can be obtained. Use rights.
  • the UE performs CCA in the second CCA time window before the third transmission time point;
  • the third transmission time point is after the first transmission time point and before the second transmission time point;
  • the UE determines that the actual transmission time point is the third transmission time point.
  • the third transmission time point belongs to the candidate transmission time point set.
  • the uplink signal is in a current burst time window
  • the abrupt time window includes the transmission of the downlink signal and the uplink signal.
  • the method further includes:
  • the base station may indicate the transmission duration of the current uplink signal, and the base station may determine the end time of the current uplink signal according to the actual transmission time point and the transmission duration indicated by the base station.
  • a base station including:
  • a determining unit configured to determine a first sending time point for the user equipment UE in the set of candidate sending time points; the first sending time point is a time point at which the UE sends the current uplink signal earliest, the first sending time point Belong to the set of candidate transmission time points,
  • the candidate transmission time point set includes at least two candidate transmission time points;
  • the determining unit is further configured to: determine a second sending time point; the second sending time point is a sending time point of the useful signal in the current uplink signal; the second sending time point is not earlier than the first a transmission time point;
  • a sending unit configured to send a notification message to the UE to indicate the first sending time point and the second sending time point, or send a notification message to the UE to indicate the first sending time point;
  • a receiving unit configured to receive, according to the second sending time point, the current uplink signal sent by the UE
  • the candidate transmission time point is a time point at which the current uplink signal is sent immediately after the detection in the CCA time window is successful, and a pre-configured first time point is sent after the CCA time window is successfully detected. And sending any one of the pre-configured second time points of the current uplink time after the detection in the CCA time window is successful.
  • the base station may determine a first transmission time point at which the UE can transmit the current uplink signal, and a second transmission time point at which the UE sends the useful signal in the current uplink signal, and indicate to the UE the first transmission time point and/or
  • the second transmission time point is such that the UE determines the actual transmission time point of the current uplink signal according to the first transmission time point and the second transmission time point, that is, the UE adjusts the actual transmission time point according to the indication of the base station, so that the first time determined by the base station
  • the sending time point is close to the time point at which the reference UE completes the CCA random backoff.
  • the actual sending time point of the current uplink signal determined by the UE according to the first sending time point and the second sending time point is also the time when the CCA random backoff is completed close to the reference UE. Point, so that each UE can be instructed to perform uplink signal transmission as much as possible, thereby reducing mutual interference between UEs.
  • the sending unit is further configured to: after sending the notification message to the UE, send contention window information to the UE, the contention window The information is used to indicate a fallback initial value, and the fallback initial value is used for random backoff of the idle channel assessment;
  • the sending unit is further configured to send the current uplink signal to the UE End time point.
  • a user equipment UE including:
  • An acquiring unit configured to acquire a first sending time point, where the first sending time point is a time point at which the UE first sends a current uplink signal, where the first sending time point belongs to a set of candidate sending time points, and the candidate sending time
  • the set of time points includes at least two candidate transmission time points;
  • a channel evaluation unit configured to perform an idle channel evaluation CCA operation by using an uplink channel
  • a determining unit configured to determine an actual sending time point of the current uplink signal according to the first sending time point and a result of the CCA operation
  • a sending unit configured to send the current uplink signal by using the uplink channel to be used from the actual sending time point
  • the candidate transmission time point is a time point at which the current uplink signal is sent immediately after the detection in the CCA time window is successful, and a pre-configured first time point is sent after the CCA time window is successfully detected. And sending any one of the pre-configured second time points of the current uplink time after the detection in the CCA time window is successful.
  • the first transmission time point is a time point determined by the base station to transmit the current uplink signal
  • the UE determines the actual transmission time point of the current uplink signal according to the first transmission time point and the result of the CCA operation, that is, the UE according to the base station.
  • the indication adjusts the actual transmission time point.
  • the UE determines, according to the first sending time point and the second sending time point, that the first sending time point determined by the base station is close to the time point at which the reference UE completes the CCA random backoff, that is, the time point at which the channel usage right is immediately transmitted.
  • the actual transmission time point of the current uplink signal is also the time point when the reference UE completes the CCA random backoff, so that each UE can be instructed to perform uplink signal transmission as much as possible, thereby reducing mutual interference between the UEs.
  • the acquiring unit is further configured to acquire a second sending time point, the second sending, before the channel determining unit performs a CCA operation
  • the time point is a transmission time point of the useful signal in the current uplink signal; the second transmission time point is not earlier than the first transmission time point.
  • the channel assessment unit is specifically configured to determine a fallback initial value, and according to the fallback initial value Perform a random backoff of the CCA;
  • the determining unit is configured to determine an actual sending time point of the current uplink signal according to the first sending time point and the second sending time point and the result of the random backoff.
  • the determining unit is specifically configured to: if the random backoff of the CCA is successful Point no later than the first sending time point, determining that the actual sending time point is not earlier than the first sending time point;
  • the first receiving unit is configured to receive contention window information sent by the base station
  • the channel evaluation unit is configured to determine the fallback initial value according to the contention window information; the contention window information is used to indicate the fallback initial value;
  • the second receiving unit is configured to receive a notification message sent by the base station
  • the acquiring unit is specifically configured to: acquire the first sending time point and the second sending time point according to the notification message received by the second receiving unit;
  • the first transmission time point is obtained.
  • the sending unit is further configured to: Determining, by the determining unit, that the actual sending time point is earlier than the second sending time point, sending a filling signal in the current uplink signal between the actual sending time point and the second sending time point, The second transmission time point begins to transmit the useful signal in the current uplink signal.
  • the channel evaluation unit is specifically configured to: use a first CCA time before the first sending time point CCA in the window;
  • the determining unit is specifically configured to: if the signal energy detected by the channel evaluation unit in the first CCA time window is not higher than an energy threshold, determine that the actual sending time point is the first sending time point .
  • the channel evaluation unit is further configured to: if the signal is detected in the first CCA time window The energy is higher than the energy threshold, and the CCA is performed in the second CCA time window before the third transmission time point; the third transmission time point is after the first transmission time point and in the Before the sending time point;
  • the determining unit is specifically configured to: if the signal energy detected by the channel assessment unit in the second CCA time window is not higher than the energy threshold, determine that the actual transmission time point is the third sending Time point.
  • the third transmission time point belongs to the candidate transmission time point set.
  • the uplink signal is in a current burst Within the time window, the abrupt time window includes the transmission of the downlink signal and the uplink signal.
  • the eleventh possible implementation manner of the fourth aspect further includes a third receiving unit,
  • the third receiving unit is configured to receive an end time point of the current uplink signal sent by the base station.
  • the acquiring unit is further configured to acquire an end time point of the current uplink signal according to the first sending time point.
  • a base station including:
  • a determining unit configured to determine a first sending time point for the user equipment UE in the set of candidate sending time points; the first sending time point is a time point at which the UE sends the current uplink signal earliest, the first sending time point A candidate transmission time point set, where the candidate transmission time point set includes at least two candidate transmission time points;
  • the determining unit is further configured to: determine a second sending time point; the second sending time point is a sending time point of the useful signal in the current uplink signal; the second sending time point is not earlier than the first a transmission time point;
  • a sending unit configured to send a notification message to the UE to indicate the first sending time point and the second sending time point, or send a notification message to the UE to indicate the first sending time point;
  • a receiving unit configured to receive, according to the second sending time point, the current uplink signal sent by the UE
  • the candidate transmission time point is a time point at which the current uplink signal is sent immediately after the detection in the CCA time window is successful, and a pre-configured first time point is sent after the CCA time window is successfully detected. And sending any one of the pre-configured second time points of the current uplink time after the detection in the CCA time window is successful.
  • the base station may determine a first transmission time point at which the UE can transmit the current uplink signal, and a second transmission time point at which the UE sends the useful signal in the current uplink signal, and indicate to the UE the first transmission time point and/or a second sending time point, so that the UE determines the current uplink signal according to the first sending time point and the second sending time point.
  • the actual transmission time point that is, the UE adjusts the actual transmission time point according to the indication of the base station, so that the UE transmits the time point of the CCA random backoff because the first transmission time point determined by the base station is close to the reference UE, so the UE according to the first transmission time point and the The actual transmission time point of the current uplink signal determined by the second transmission time point is also the time point when the reference UE completes the CCA random backoff, so that each UE can be instructed to perform uplink signal transmission as much as possible, thereby reducing mutual interference between the UEs.
  • the base station may determine a first transmission time point at which the UE can transmit the current uplink signal, and a second transmission time point at which the UE sends the useful signal in the current uplink signal, and indicate to the UE the first transmission time point and/or
  • the second transmission time point is such that the UE determines the actual transmission time point of the current uplink signal according to the first transmission time point and the second transmission time point, that is, the UE adjusts the actual transmission time point according to the indication of the base station, so that the first time determined by the base station
  • the sending time point is close to the time point at which the reference UE completes the CCA random backoff.
  • the actual sending time point of the current uplink signal determined by the UE according to the first sending time point and the second sending time point is also the time when the CCA random backoff is completed close to the reference UE. Point, so that each UE can be instructed to perform uplink signal transmission as much as possible, thereby reducing mutual interference between UEs.
  • the sending unit is further configured to: after sending the notification message to the UE, send contention window information to the UE, the contention window The information is used to indicate a fallback initial value, and the fallback initial value is used for random backoff of the idle channel assessment;
  • the sending unit is further configured to send the current uplink signal to the UE End time point.
  • a user equipment UE including:
  • An acquiring unit configured to acquire a first sending time point, where the first sending time point is a time point at which the UE first sends a current uplink signal, where the first sending time point belongs to a set of candidate sending time points, and the candidate sending time
  • the set of time points includes at least two candidates Select the time of transmission;
  • a channel evaluation unit configured to perform an idle channel evaluation CCA operation by using an uplink channel
  • a determining unit configured to determine an actual sending time point of the current uplink signal according to the first sending time point and a result of the CCA operation
  • a sending unit configured to send the current uplink signal by using the uplink channel to be used from the actual sending time point
  • the candidate transmission time point is a time point at which the current uplink signal is sent immediately after the detection in the CCA time window is successful, and a pre-configured first time point is sent after the CCA time window is successfully detected. And sending any one of the pre-configured second time points of the current uplink time after the detection in the CCA time window is successful.
  • the first transmission time point is a time point determined by the base station to transmit the current uplink signal
  • the UE determines the actual transmission time point of the current uplink signal according to the first transmission time point and the result of the CCA operation, that is, the UE according to the base station.
  • the indication adjusts the actual transmission time point.
  • the UE determines, according to the first sending time point and the second sending time point, that the first sending time point determined by the base station is close to the time point at which the reference UE completes the CCA random backoff, that is, the time point at which the channel usage right is immediately transmitted.
  • the actual transmission time point of the current uplink signal is also the time point when the reference UE completes the CCA random backoff, so that each UE can be instructed to perform uplink signal transmission as much as possible, thereby reducing mutual interference between the UEs.
  • the acquiring unit is further configured to: before the channel assessment unit performs a CCA operation, acquire a second sending time point, where the second sending The time point is a transmission time point of the useful signal in the current uplink signal; the second transmission time point is not earlier than the first transmission time point.
  • the channel measurement unit is specifically configured to determine a fallback initial value, and according to the rollback initial value Perform a random backoff of the CCA;
  • the determining unit is configured to determine an actual sending time point of the current uplink signal according to the first sending time point and the second sending time point and the result of the random backoff.
  • the determining unit is specifically configured to: if the random backoff of the CCA is successful Point no later than the first sending time point, determining that the actual sending time point is not earlier than the first sending time point;
  • the first receiving unit is configured to receive contention window information sent by the base station
  • the channel evaluation unit is configured to determine the fallback initial value according to the contention window information; the contention window information is used to indicate the fallback initial value;
  • the second receiving unit is configured to receive a notification message sent by the base station
  • the acquiring unit is specifically configured to: acquire the first sending time point and the second sending time point according to the notification message received by the second receiving unit;
  • the first transmission time point is obtained.
  • the sending unit is further configured to: Determining, by the determining unit, that the actual sending time point is earlier than the second sending time point, sending between the actual sending time point and the second sending time point The padding signal in the current uplink signal starts to send the useful signal in the current uplink signal from the second transmission time point.
  • the channel evaluation unit is specifically configured to: use a first CCA time before the first sending time point CCA in the window;
  • the determining unit is specifically configured to: if the signal energy detected by the channel evaluation unit in the first CCA time window is not higher than an energy threshold, determine that the actual sending time point is the first sending time point .
  • the channel evaluation unit is further configured to: if the signal is detected in the first CCA time window The energy is higher than the energy threshold, and the CCA is performed in the second CCA time window before the third transmission time point; the third transmission time point is after the first transmission time point and in the Before the sending time point;
  • the determining unit is specifically configured to: if the signal energy detected by the channel assessment unit in the second CCA time window is not higher than the energy threshold, determine that the actual transmission time point is the third sending Time point.
  • the third sending time point belongs to the candidate sending time point set.
  • the uplink signal is in a current burst time window
  • the abrupt time window includes the transmission of the downlink signal and the uplink signal.
  • the eleventh possible implementation manner of the sixth aspect further includes a third receiving unit,
  • the third receiving unit is configured to receive an end time point of the current uplink signal sent by the base station.
  • the acquiring unit is further configured to acquire an end time point of the current uplink signal according to the first sending time point.
  • FIG. 1a is a schematic diagram of UE alignment transmission according to an embodiment of the present invention.
  • FIG. 1b is a schematic diagram of UE unaligned transmission according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of interaction in a communication system according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic flowchart of a method for transmitting an uplink signal according to Embodiment 2 of the present invention
  • FIG. 4 is a schematic diagram of a first transmission time point according to Embodiment 2 of the present invention.
  • FIG. 5 is a schematic diagram of a second transmission time point according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic flowchart of a method for transmitting an uplink signal according to Embodiment 3 of the present invention.
  • FIG. 7 is a structural block diagram of a base station according to Embodiment 4 of the present invention.
  • FIG. 8 is a structural block diagram of a UE according to Embodiment 5 of the present invention.
  • FIG. 9 is a block diagram showing another structure of a UE according to Embodiment 5 of the present invention.
  • FIG. 10 is a block diagram showing another structure of a UE according to Embodiment 5 of the present invention.
  • FIG. 11 is a block diagram showing another structure of a UE according to Embodiment 5 of the present invention.
  • Multi-user scheduling In the LTE communication system, in the same subframe, multiple communication terminals can simultaneously transmit signals or receive signals on the spectrum resources. That is, each user occupies part of the frequency domain resources, so that multiple users can be simultaneously multiplexed with spectrum resources.
  • Channel Listening Before a node occupies a channel to transmit a signal, it first needs to detect the channel.
  • the detection mode may include energy detection, signal detection, and the like.
  • Base station eNB or cell or access network device: Typically, it is a signal sender in the downlink communication link. In the uplink communication link, it is a signal receiver, and a sender of control information (transmitter control information).
  • the UE (terminal) is typically the sender of the signal in the uplink communication link.
  • the downlink communication link is the receiver of the signal.
  • the communication node obtains the permission to transmit signals on the channel in some way, and can be considered to obtain the right to use the channel.
  • the base station allocates channel resources through a scheduling algorithm, and the nodes that are scheduled are considered to have obtained channel usage rights.
  • the UE specifically complies with the communication mechanism of the first listening and the subsequent transmission, and if the detection channel result is idle and data transmission is possible, it can also be regarded as obtaining the channel usage right.
  • the UE For LAA UL (uplink) transmission, the UE needs to listen to the radio channel before the signal is transmitted. Only the UE that is scheduled by the base station and whose channel listening result is idle (that is, obtains the channel usage right) can perform signal transmission.
  • the LBT parameters of each scheduled UE for example, the initial value of the random backoff is different, the energy detection threshold for determining the busy state of the channel, the channel measurement condition, etc.
  • the time at which each UE sends a signal may be different, so that the node that performs the first transmission causes interference to the node that is sent later, so that after the node that is sent later is interfered, the channel listening result is busy, and thus the signal transmission cannot be performed, that is, between the UEs. Blocking each other.
  • FIG. 1a It is assumed that UE1, UE2, UE3, and UE4 are scheduled by the base station in subframe n. Before the data transmission at n+k time, each UE needs to perform a listening channel. If the channel is idle during the listening time, it is random. The backoff counter is subtracted from a certain value. Until the backoff counter is reduced to zero, the UE obtains the channel usage right, and the UE can send the uplink signal (that is, the PPDU in FIG. 1a).
  • the backoff counter is simultaneously reduced to zero, and the backoff counter will send the uplink signal at the same time, so there is no mutual interference between the UEs.
  • the parameters may be different.
  • the backoff counter configuration is different, so that the UE with a small backoff counter backoff initial value may be first reduced to zero, so that the UE performs signaling first. Referring to Figure 1a, for example UE2, UE3.
  • the UE2 and the UE3 that are the first ones will cause interference to the UE1 and the UE4 that are performing channel interception, so that the channel listening result of the UE1 and the UE4 is busy, so that the UE1 and the UE4 cannot obtain the channel usage right, and thus the signal cannot be transmitted.
  • the principle of the present invention is that the base station indicates to the UE that the UE can transmit the first uplink time point of the current uplink signal, and the UE determines the current uplink signal according to the first sending time point and the second sending time point (the time point when the UE sends the useful signal).
  • the actual transmission time point that is, the UE adjusts the actual transmission time point according to the indication of the base station, so that the UE transmits the time point of the CCA random backoff because the first transmission time point determined by the base station is close to the reference UE, so the UE according to the first transmission time point and
  • the actual transmission time point of the current uplink signal determined by the second transmission time point is also a time point when the reference UE completes the CCA random backoff, so that each UE can be instructed to perform uplink signal transmission as much as possible, thereby reducing mutual interference between the UEs.
  • the embodiment of the invention provides a communication system. As shown in FIG. 2, the communication system includes a base station 10 and at least one UE 20.
  • the embodiment of the present invention uses a UE scheduled by the base station as an example to describe a method for transmitting an uplink signal according to an embodiment of the present invention.
  • the base station 10 includes a processor 101, a transmitter 102, and a receiver 103, and a memory 104.
  • the UE 20 includes a processor 201, a transmitter 202, and a receiver 203 and a memory 204.
  • processor 101 and the processor 201 may be a central processing unit (English: central processing unit, abbreviated as CPU).
  • Transmitter 102, transmitter 202 can be implemented by a light emitter, an electrical transmitter, a wireless transmitter, or any combination thereof.
  • the light emitter can be a small form-factor pluggable transceiver (SFP) transmitter (English: transceiver), and the enhanced small form-factor pluggable (English: enhanced small form-factor pluggable, Abbreviation: SFP+) Transmitter or 10 Gigabit small form-factor pluggable (XFP) transmitter.
  • the electric transmitter can be an Ethernet (English: Ethernet) network connection Port controller (English: network interface controller, abbreviation: NIC).
  • the wireless transmitter can be a wireless network interface controller (English: wireless network interface controller, abbreviation: WNIC).
  • the receiver 103 and the receiver 203 can be implemented by an optical receiver, an electrical receiver, a wireless receiver, or any combination thereof.
  • the optical receiver can be a small package pluggable receiver, an enhanced small package pluggable receiver or a 10 gigabit small package pluggable receiver.
  • the electrical receiver can be an Ethernet network interface controller.
  • the wireless receiver can be a wireless network interface controller.
  • a memory 104 (memory 204) for storing program code and transmitting the program code to the processor 101 (processor 201), the processor 101 (processor 201) executing the following instructions in accordance with the program code.
  • the memory 104 may include a volatile memory (English: volatile memory), such as random-access memory (abbreviation: RAM); the memory 104 (memory 204) may also include non-volatile Memory (English: non-volatile memory), such as read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or Solid state drive (English: solid-state drive, abbreviation: SSD).
  • the memory 104 (memory 204) may also include a combination of the above types of memories.
  • the method for transmitting an uplink signal includes the following steps:
  • the processor 101 determines a first transmission time point and a second transmission time point.
  • the first transmission time point is determined by the base station for the UE in the set of candidate transmission time points, and the first transmission time point is a time point at which the UE sends the current uplink signal earliest.
  • the candidate transmission time point set includes at least two candidate transmission time points.
  • the second transmission time point is a transmission time point of the useful signal in the current uplink signal.
  • the time point at which the current uplink signal is sent earliestly refers to the earliest time point at which the UE allows to transmit the current uplink signal.
  • the UE does not allow the uplink signal to be sent even if the CCA succeeds before the first transmission time point, but waits until the first transmission time point sends the current uplink signal or sends between the first transmission time point and the second transmission time point. Send the current uplink signal.
  • the second transmission time point here is after the first transmission time point, and is a transmission time point at which the UE sends the useful signal in the current uplink signal.
  • the so-called CCA success means that the UE detects that the signal energy is not higher than the energy threshold in the CCA time window, or the UE retreats the initial value in the CCA time window to zero.
  • the transmitter 102 sends a notification to the UE to indicate the first sending time point and the second sending time point.
  • the UE sends the current uplink signal according to the first sending time point and the second sending time point.
  • the notification message sent by the transmitter 102 to the UE may only indicate the first transmission time point, and the processor 201 of the UE determines a custom time point as the second transmission time point.
  • the receiver 203 receives the notification message, and the processor 201 acquires the first sending time point and the second sending time point.
  • the processor 201 acquires the first sending time point and the second sending time point according to the notification information. Alternatively, after obtaining the first transmission time point according to the notification information, it is determined that one subframe boundary (or symbol boundary) is the second transmission time point.
  • the processor 201 is to perform a CCA operation on the uplink channel.
  • the initial value of the fallback may be determined, and the random backoff of the idle channel evaluation CCA may be performed according to the backoff initial value determined by the determining unit.
  • the processor 201 needs to acquire the first transmission time point and the second transmission time point.
  • the CCA is performed within the CCA time window, where the processor 201 only needs to acquire the first transmission time point.
  • the processor 201 determines an actual transmission time point of the current uplink signal according to the first sending time point and the second sending time point and a result of the CCA operation.
  • the transmitter 102 sends a notification message to the UE to indicate only the first transmission time point, where the processor 201 determines a second transmission time point. And determining, according to the first sending time point and the second sending time point, and the result of the random backing, the current uplink letter. The actual transmission time point of the number.
  • the notification information only indicates the first transmission time point, where the processor 201 is based on the first transmission time point and the first CCA time window.
  • the detection result determines the actual transmission time point of the current uplink signal.
  • the transmitter 202 sends the current uplink signal by using the uplink channel to be used from the actual transmission time point.
  • the receiver 103 receives the current uplink signal sent by the UE from the second sending time point.
  • the candidate transmission time point is a time point at which the current uplink signal is sent immediately after the detection in the CCA time window is successful, and a pre-configured first time is sent after the CCA time window is successfully detected. Sending any one of the pre-configured second time points of the current uplink time after a time point and a successful detection in the CCA time window.
  • the UE may perform a random backoff (backoff counter reduction) of the CCA in the CCA time window, or may perform channel sensing with a one shot duration.
  • the pre-configured first time point may be a time point immediately after the self-defer is sent after the CCA time window is successfully detected, and the pre-configured second time point may be after the padding is performed after the CCA time window is successfully detected.
  • the time point of immediate transmission, in short, the first time point is different from the second time point.
  • application scenarios of the method provided by the embodiment of the present invention may include the following:
  • Scenario 1 The macro station and the small station work on the licensed spectrum and the unlicensed spectrum respectively by carrier aggregation.
  • the small station and the macro station are connected by an ideal backhaul link.
  • Scenario 2 The macro station works in the licensed spectrum, and the small station works on the licensed spectrum and the unlicensed spectrum through carrier aggregation.
  • the licensed spectrum and the unlicensed spectrum of the small station are connected by an ideal backhaul link.
  • the small station and the macro station are connected by an ideal or non-ideal backhaul link.
  • Scenario 3 The small station works on the licensed spectrum and the unlicensed spectrum through carrier aggregation.
  • the licensed spectrum and the unlicensed spectrum of the small station are connected by an ideal backhaul link.
  • the macro station does not have a wide range of coverage services.
  • the base station in the embodiment of the present invention may be a macro station in the foregoing three scenarios, and the information transmission between the UE and the UE may be performed by using an authorized spectrum or by using an unlicensed spectrum.
  • the base station may determine that the UE may send the first transmission time point of the current uplink signal, and indicate the first transmission time point and the second transmission time point to the UE, so that the UE is according to the first
  • the sending time point determines the actual transmission time point of the current uplink signal, that is, the UE adjusts the actual transmission time point according to the indication of the base station, so that the UE determines that the first transmission time point is close to the reference UE and completes the CCA random backoff time, so the UE
  • the actual transmission time point of the current uplink signal determined according to the first transmission time point is also a time point when the reference UE completes the CCA random backoff, so that each UE can be instructed to perform uplink signal transmission as much as possible, thereby reducing mutual interference between UEs.
  • the UE is not allowed to send an uplink signal even if the CCA succeeds before the first transmission time point, and may wait until the first transmission time point or the The current uplink signal is transmitted after the first transmission time point and before the second transmission time point.
  • An embodiment of the present invention provides a method for transmitting an uplink signal. As shown in FIG. 3, the method includes the following steps:
  • the base station determines a first sending time point and a second sending time point.
  • the first sending time point is a time point at which the UE first sends the current uplink signal
  • the second sending time point is a time point at which the UE sends the useful signal in the current uplink signal.
  • the useful signal here refers to the actual transmission of the UE to the base station. Valid information, not including padding information.
  • the second transmission time point can be understood as the time point that the UE determines that the UE sends the current uplink signal, but may not be the time point when the UE actually sends the current uplink signal.
  • the time point at which the current uplink signal is sent earliestly refers to the earliest time point at which the UE allows to transmit the current uplink signal.
  • the UE does not allow the uplink signal to be sent even if the CCA succeeds before the first transmission time point, but waits until the first transmission time point sends the current uplink signal or sends the current between the first transmission time point and the second transmission time point.
  • the second transmission time point here is after the first transmission time point, and is a transmission time point at which the UE sends the useful signal in the current uplink signal.
  • the first sending time point is determined by the base station for the user equipment UE in the set of candidate transmission time points.
  • the first transmission time point belongs to a candidate transmission time point set, and the candidate transmission time point set includes at least two candidate transmission time points.
  • the candidate transmission time point is a time point at which the current uplink signal is sent immediately after the detection in the CCA time window is successful, and a pre-configured first time point and CCA for transmitting the current uplink signal after the CCA time window is successfully detected. After the detection in the time window is successful, any one of the pre-configured second time points of the current uplink time is sent.
  • the UE may perform a CCA random backoff (backoff counter reduction) in the CCA time window, and the so-called CCA time window detection success may be that the random backoff initial value is reduced to zero.
  • the UE can also perform channel sounding with one shot in the CCA time window.
  • the so-called CCA time window detection succeeds in detecting that the signal energy is not higher than the energy threshold in the CCA time window.
  • the pre-configured first time point may be a time point immediately after the self-defer is sent after the CCA time window is successfully detected, and the pre-configured second time point may be after the padding is performed after the CCA time window is successfully detected.
  • the time point of immediate transmission in short, the first time point is different from the second time point.
  • immediate transmission is used to illustrate that if the time point of the random backoff of the CCA is successful at the sub-frame (or symbol) boundary, the so-called immediate transmission starts from the subframe boundary (or symbol boundary); if CCA The time point for the successful random backoff is not at the sub-frame (or symbol) boundary, but also has to be sent by self-defer to the sub-frame boundary (or symbol boundary).
  • the first preset duration and the second preset duration may be relative times, for example, the start time is the first symbol of the nth subframe, and the duration is 0.5 us. It may also be an absolute time, for example, the start time is the first symbol of the nth subframe, and the end time is the fifth symbol of the nth subframe.
  • the UE may perform padding (ie, send a padding signal to the base station), or may perform a self-defer operation, which may or may not listen to the channel.
  • the CCA can be padded for a certain period of time during the random backoff process, or it can be a complete uninterrupted random backoff process.
  • the first preset duration and the second preset duration may be fixed time intervals, for example, 16 us, 25 us, or a predefined fixed time interval obtained by other UEs. It can also be a variable time interval. For example, depending on the type of service, the time interval can be m(us)+N*slot(us), where m is a fixed time interval, depending on signal processing time and transmission sum. Receive signal delay, for example, 16us. N is a non-negative integer, and the value of different service types N may be different.
  • a slot is a basic unit of time interval, for example, 9us.
  • the first preset duration and the second preset duration may be defined by the base station side, and are notified or indicated to the UE by the base station. Or the UE's own definition. Or, when the base station notifies the UE that the reserved channel information ends, the time interval from the end of the reserved channel information to the subframe boundary (or the symbol boundary or the slot boundary) is the time interval.
  • the base station may determine that each scheduled UE completes the CCA random backoff. (that is, the time when the initial value of the random backoff is reduced to zero), it may be determined that a UE that has completed the CCA random backoff is a reference UE, and when the first time point is determined, the reference UE is referenced to complete the CCA random backoff.
  • the time point is such that the first transmission time point is as close as possible to the time point at which the reference UE completes the CCA random backoff.
  • the UE is caused to send according to the first sending time point and the second sending time
  • the current uplink signal is transmitted at a time point.
  • the base station only indicates the first transmission time point by using the notification information
  • the UE may obtain the first transmission time point according to the notification information, and the UE may determine the second transmission time point by itself, which may be a convention in the LTE system.
  • the time point is determined as the second transmission time point, such as a subframe boundary, a symbol boundary, and the like.
  • the UE may be a UE scheduled by an eNB (ie, the base station). Specifically, the eNB may schedule a UE waiting to transmit a UL signal (uplink signal) by using an uplink scheduling (UL grant).
  • the UL grant can be carried on an unlicensed carrier and/or an authorized carrier.
  • the UE acquires a first sending time point and a second sending time point.
  • the UE receives the notification message sent by the base station, and obtains the first sending time point and/or the second sending time point according to the notification message.
  • the notification message may carry the first transmission time point and/or the second transmission time point
  • the UE parses the notification message, and acquires the first transmission time point and/or the second transmission time point.
  • the indication information indicating the first sending time point and/or the second sending time point carried by the notification message the UE acquiring the notification information according to the indication information to carry the first sending time point and/or the second Send time point.
  • the base station indicates the first transmission time point
  • the UE itself determines the second transmission time point. That is to say, the second transmission time point may be acquired by the UE according to the indication of the base station, or may be a time point conventionally established in the LTE system, such as a subframe boundary, a symbol boundary, and the like.
  • the first transmission time point is in the subframe n, but not the subframe boundary, and the boundary of the subframe n may be determined as the second transmission time point.
  • the first sending time point may be a time point at which the current uplink signal is sent immediately after the CPA random backoff success (backoff counter is reduced to zero), as shown in FIG. 4, the first sending time point corresponding to UE1.
  • the time point at which the current uplink signal is sent immediately after one shot is executed may be, as shown in FIG. 4, the first transmission time point corresponding to UE2, and UE2 may perform channel sounding during one shot or may not perform channel sounding.
  • the base station sends a fallback initial value or contention window information to the UE.
  • the base station sends contention window (CW) information to the UE, so that the UE determines a backoff initial value according to the contention window information, and performs random backoff of the idle channel evaluation CCA; After indicating the back-off initial value, the UE may determine a back-off initial value according to the contention window information.
  • the base station and the UE maintain the same contention window, and the contention window includes four back-off initial values, which are represented by 00, 01, 10, and 11, respectively, where 00, 01, 10, and 11 are contention window information, if the base station If the indication is 00, the UE may determine its corresponding initial value of the backoff according to 00.
  • the base station sends the back-off initial value to the UE, so that the UE performs random back-off of the idle channel assessment CCA according to the back-off initial value.
  • the base station may also send the contention window information to the UE, and the UE determines a back-off initial value according to the multiple back-off initial values included in the contention window information sent by the base station.
  • the length of the rollback time Q may be predefined, for example, 1 us, 9 us, or the like, or a variable length of time.
  • the length of time may be configured to be different according to different service types.
  • the UE performs a random backoff of the CCA according to the initial value of the backoff.
  • the UE may receive the initial value of the backoff sent by the base station and perform random backoff of the CCA according to the initial value of the backoff.
  • the initial value of the fallback is determined according to the contention window information sent by the base station.
  • the UE When the UE detects that the inactive channel is idle, it subtracts a value from the initial value of the backoff, and detects that the inactive channel is idle again, and then subtracts the value until the initial value of the backoff is reduced to zero. (ie, the random backoff of CCA is successful).
  • the UE determines an actual sending time point of the current uplink signal according to the first sending time point, the second sending time point, and the result of the random backoff.
  • the actual transmission time point that is, the time point at which the UE actually performs uplink transmission may be earlier than the time point at which the UE transmits the useful signal in the current uplink signal.
  • the UE determines that the actual sending time point is not earlier than the first sending time point. That is to say, even if the random backoff of the CCA is successful before the first transmission time point, the UE needs to wait at the first transmission time point to start transmitting the current uplink signal.
  • the actual transmission time point is the first transmission time point.
  • the UE determines that the actual sending time point is not earlier than The time point at which the random backoff is successful is not later than the second sending time point. That is, when the UE completes the random backoff of the CCA between the first transmission time point and the second transmission time point (the initial value of the backoff is reduced to zero), the actual transmission time point of the UE is at the time when the random backoff succeeds. Two transmission time points between. Preferably, the actual transmission time point is the second transmission time point.
  • the actual transmission time point C is after the first transmission time point A, or between the first transmission time point A and the second transmission time point B.
  • the UE sends the current uplink signal by using the uplink channel to be used from the actual sending time point.
  • the base station receives, according to the second sending time point, the current uplink signal sent by the UE.
  • the base station must start receiving the uplink signal at the second transmission time point.
  • the time point at which the UE transmits an uplink signal depends on the time indicated by the base station scheduling the UL scheduling information (ie, UL grant) of the UE.
  • the base station n transmits UL scheduling information at a time
  • the UE transmits the UL signal at time n+k.
  • the value of k is related to the subframe configuration. Once the self-detection configuration is fixed, the k value is fixed.
  • the UE In the LAA, after the base station transmits the UL scheduling information, the UE also needs to listen to the used channel, and judges whether the channel usage right is obtained according to the result of the channel listening.
  • the UE can only send an uplink signal after the UE is scheduled by the base station and the channel usage right is obtained. Therefore, the existing LTE uplink scheduling does not indicate the moment when the UE actually transmits the uplink signal.
  • the UE because the channel conditions of the scheduled UEs are different, and the LBT parameters are different, the time at which each UE sends the uplink signal is different. Therefore, the UE may perform channel measurement when other UEs occupy the channel, and the UE considers that the channel is unavailable.
  • the uplink signal is not transmitted at the time of uplink signal transmission, thereby causing mutual interference between UEs that are not simultaneously transmitted.
  • the base station may determine a first transmission time point at which the UE can transmit the current uplink signal, and a second transmission time point at which the UE sends the useful signal in the current uplink signal, and indicate to the UE the first transmission time point and/or
  • the second transmission time point is such that the UE determines the actual transmission time point of the current uplink signal according to the first transmission time point and the second transmission time point, that is, the UE adjusts the actual transmission time point according to the indication of the base station, so that the first time determined by the base station
  • the sending time point is close to the time point at which the reference UE completes the CCA random backoff.
  • the actual sending time point of the current uplink signal determined by the UE according to the first sending time point and the second sending time point is also the time when the CCA random backoff is completed close to the reference UE. Point, so that each UE can be instructed to perform uplink signal transmission as much as possible, thereby reducing mutual interference between UEs.
  • the base station sends an end time point of the current uplink signal to the UE.
  • the UE receives the end time point of the current uplink signal sent by the base station.
  • the UE acquires an end time point of the current uplink signal according to the first sending time point.
  • the base station may indicate the transmission duration of the current uplink signal, and the base station may determine the end time of the current uplink signal according to the actual transmission time point and the transmission duration indicated by the base station.
  • the UE determines that the actual transmission time point is earlier than the second transmission time point, the UE is in the actual transmission time point to the second transmission time point. Transmitting a padding signal in the current uplink signal, and transmitting a useful signal in the current uplink signal from the second transmission time point.
  • the content of the padding signal is not limited herein, and may be a sequence, a reference signal, data information, etc., and the padding signal is sent between the actual transmission time point and the second transmission time point, because the actual transmission time determined by the UE according to the indication of the base station.
  • the UE Before the second transmission time point, in order not to cause interference to other UEs performing CCA, the UE needs to occupy the channel from the actual transmission time point, but the actual transmission time point is different from the second transmission time point, so it cannot be sent useful.
  • the signal can be occupied by sending a padding signal padding.
  • the UE may send the padding by reserving the wireless channel.
  • the starting time of the reserved wireless channel may be a subframe boundary, a slot boundary, a symbol boundary, and any time position in one subframe. For example, after the UE randomly returns, the UE immediately sends the padding time through the reserved wireless channel.
  • the end time of the reserved radio channel information may be a subframe boundary, a slot boundary, a symbol boundary, and an arbitrary time position of the subframe.
  • the information included in the padding sent by the UE through the reserved wireless channel can be obtained by the following methods: a dynamic signaling notification sent by the UE through the base station (eg, UL grant), and/or a semi-static, static signaling (eg, broadcast letter today)
  • the radio resource control information RRC obtains the information.
  • the base station may determine a first transmission time point at which the UE can transmit the current uplink signal, and a second transmission time point at which the UE sends the useful signal in the current uplink signal, and indicate to the UE.
  • the first sending time point and/or the second sending time point so that the UE determines the actual sending time point of the current uplink signal according to the first sending time point and the second sending time point, that is, the UE adjusts the actual sending time point according to the indication of the base station, In this way, since the first transmission time point determined by the base station is close to the time point at which the reference UE completes the CCA random backoff, the actual transmission time point of the current uplink signal determined by the UE according to the first transmission time point and the second transmission time point. It is also a point in time when the reference UE completes the CCA random backoff, so that each UE can be instructed to perform uplink signal transmission as much as possible, thereby reducing mutual interference between UEs.
  • the present invention also provides a method for transmitting an uplink signal. As shown in FIG. 6, the method includes the following steps:
  • the base station determines a first sending time point.
  • the base station sends a notification message to the UE to indicate the first sending time point.
  • the UE acquires a first sending time point.
  • the UE performs CCA in a first CCA time window before the first sending time point.
  • the first CCA time window may be a time interval before the first transmission time point, and energy measurement is performed within the CCA time window. If the energy measured by the UE in the first CCA time window is higher than an energy threshold, the UE may perform the CCA time window again at any time point between the first transmission time point and the second transmission time point. The energy measurement inside, that is, step S306 is performed.
  • the UE performs CCA in the second CCA time window before the third transmission time point; if the UE is in If the signal energy detected in the second CCA time window is not higher than the energy threshold, it is determined that the actual transmission time point is the third transmission time point.
  • the third transmission time point is after the first transmission time point and before the second transmission time point.
  • the second transmission time point may be that the base station indicates to the UE by the notification information in step S302, or may be one subframe boundary (or symbol boundary) determined by the UE before step S306.
  • the UE measures energy in a CCA time window before each symbol between the first time point and the second time point, and at the same time at the first time point and the second time point Do not do the CCA process at other points in time. Until the energy measured in the CCA time window is not higher than the energy threshold, the actual data transmission time is not earlier than the second transmission time point.
  • the UE sends the current uplink signal by using the uplink channel to be used from the actual transmission time point.
  • the base station receives the current uplink signal sent by the UE, starting from a second sending time point.
  • the second transmission time point is a time point determined by the base station to send the useful signal in the current uplink signal by the UE.
  • the useful signal here refers to the effective information that the UE actually transmits to the base station, and does not include the padding information.
  • the second transmission time point can be understood as the time point that the UE determines that the UE sends the current uplink signal, but may not be the time point when the UE actually sends the current uplink signal.
  • the implementation manner of performing channel measurement detection signal energy in the CCA time window is applied to a scenario in which the current uplink signal is sent in a current burst time window.
  • the transmission time window includes a downlink signal and a transmission of the uplink signal. Outside the burst time window, it does not apply.
  • the base station may determine that the UE may send the first transmission time point of the current uplink signal, and indicate the first transmission time point and/or the second transmission time point to the UE, so that the UE according to the UE
  • the first transmission time point determines the actual transmission time point of the current uplink signal, that is, the UE adjusts the actual transmission time point according to the indication of the base station, so that the first transmission time point determined by the base station is close to the reference UE to complete the CCA random backoff time point (That is, the time point at which the channel usage right immediately transmits the uplink signal is obtained.
  • the actual transmission time point of the current uplink signal determined by the UE according to the first transmission time point is also the time point at which the CCA random backoff is completed close to the reference UE, so that each can be instructed.
  • the UE performs uplink signal transmission as much as possible to reduce mutual interference between UEs.
  • the embodiment of the present invention provides a base station 40.
  • the base station 40 includes a determining unit 401, a sending unit 402, and a receiving unit 403.
  • a determining unit 401 configured to be a user equipment UE in the set of candidate transmission time points Determining a first transmission time point; the first transmission time point is a time point at which the UE sends the current uplink signal earliest, the first transmission time point belongs to a candidate transmission time point set, and the candidate transmission time point set includes at least Two candidate transmission time points.
  • the determining unit 401 is further configured to determine a second sending time point; the second sending time point is a sending time point of the useful signal in the current uplink signal.
  • the sending unit 402 is configured to send a notification message to the UE to indicate the first sending time point and the second sending time point, or send a notification message to the UE to indicate the first sending time point, so that The UE sends the current uplink signal according to the first sending time point and the second sending time point.
  • the receiving unit 403 is configured to receive, according to the second sending time point, the current uplink signal sent by the UE.
  • the candidate transmission time point is a time point at which the current uplink signal is sent immediately after the detection in the CCA time window is successful, and a pre-configured first time point is sent after the CCA time window is successfully detected. And sending any one of the pre-configured second time points of the current uplink time after the detection in the CCA time window is successful.
  • the UE may perform a random backoff (backoff counter reduction) of the CCA in the CCA time window, or may perform channel sensing with a one shot duration.
  • the pre-configured first time point may be a time point immediately after the self-defer is sent after the CCA time window is successfully detected, and the pre-configured second time point may be after the padding is performed after the CCA time window is successfully detected.
  • the time point of immediate transmission, in short, the first time point is different from the second time point.
  • the time point at which the current uplink signal is sent earliestly refers to the earliest time point at which the UE allows to transmit the current uplink signal.
  • the UE does not allow the uplink signal to be sent even if the CCA succeeds before the first transmission time point, but waits until the first transmission time point sends the current uplink signal or sends the current between the first transmission time point and the second transmission time point.
  • the second transmission time point here is after the first transmission time point, and is a transmission time point at which the UE sends the useful signal in the current uplink signal.
  • the sending unit 402 is further configured to send a notification message to the UE, and then The UE sends the contention window information, so that the UE determines the fallback initial value according to the contention window information, and performs a random backoff of the idle channel assessment CCA; the contention window information is used to indicate the fallback initial value.
  • the sending unit 402 is further configured to send an end time point of the current uplink signal to the UE.
  • the sending unit 402 in this embodiment may be the transmitter 102 of the base station; the receiving unit 403 may be the receiver 103 of the base station, and the transmitter 102 may also be integrated with the receiver 103 to form a transceiver.
  • the determining unit 401 may be a separately set processor 101, or may be integrated in a processor of the base station, or may be stored in the memory 104 of the base station in the form of program code, and is called by a certain processor of the base station. The function of the above determining unit 401 is performed.
  • the processor described herein may be a central processing unit (CPU) or an application specific integrated circuit (ASIC).
  • the base station may determine that the UE may send the first transmission time point of the current uplink signal, and the second transmission time point that the UE sends the useful signal in the current uplink signal, and indicate the first transmission time point to the UE. And the second transmission time point, so that the UE determines the actual transmission time point of the current uplink signal according to the first transmission time point and the second transmission time point, that is, the UE adjusts the actual transmission time point according to the indication of the base station, so that the base station determines The first transmission time point is close to the time point at which the reference UE completes the CCA random backoff.
  • the actual transmission time point of the current uplink signal determined by the UE according to the first transmission time point and the second transmission time point is also close to the reference UE to complete the CCA random return.
  • the time point of the retreat so that each UE can be instructed to perform uplink signal transmission as much as possible, thereby reducing mutual interference between UEs.
  • the embodiment of the present invention provides a UE 50.
  • the UE 50 includes an acquiring unit 501, a channel evaluating unit 502, a determining unit 503, and a sending unit 504.
  • the acquiring unit 501 is configured to acquire a first sending time point, where the first sending time point is a time point at which the UE sends the current uplink signal, and the first sending time point belongs to a set of candidate sending time points, where the candidate The set of transmission time points includes at least two candidate transmission time points.
  • the channel evaluation unit 502 is configured to perform an idle channel evaluation CCA operation with the uplink channel.
  • the determining unit 503 is configured to determine an actual sending time point of the current uplink signal according to the first sending time point and the result of the CCA operation.
  • the sending unit 504 is configured to send the current uplink signal by using the uplink channel to be used from the actual transmission time point.
  • the candidate transmission time point is a time point at which the current uplink signal is sent immediately after the detection in the CCA time window is successful, and a pre-configured first time point is sent after the CCA time window is successfully detected. And sending any one of the pre-configured second time points of the current uplink time after the detection in the CCA time window is successful.
  • the time point at which the current uplink signal is sent earliestly refers to the earliest time point at which the UE allows to transmit the current uplink signal.
  • the UE does not allow the uplink signal to be sent even if the CCA succeeds before the first transmission time point, but waits until the first transmission time point sends the current uplink signal or sends the current between the first transmission time point and the second transmission time point.
  • the second transmission time point here is after the first transmission time point, and is a transmission time point at which the UE sends the useful signal in the current uplink signal.
  • the acquiring unit 501 is further configured to: before the channel assessment unit performs the CCA operation, acquire a second transmission time point, where the second transmission time point is a transmission time point of the useful signal in the current uplink signal; The second transmission time point is not earlier than the first transmission time point.
  • the channel evaluation unit 502 is specifically configured to: determine a backoff initial value, and perform a random backoff of the CCA according to the backoff initial value;
  • the determining unit 503 is specifically configured to determine an actual sending time point of the current uplink signal according to the first sending time point and the second sending time point and the result of the random backoff.
  • the determining unit 503 is specifically configured to: if the time point of the random backoff of the CCA is successful, not later than the first sending time point, determining that the actual sending time point is not earlier than the first sending time point ;
  • the UE 50 further includes a first receiving unit 505.
  • the first receiving unit 505 is configured to receive contention window information sent by the base station.
  • the channel evaluation unit 502 is specifically configured to: determine the fallback initial value according to the contention window information; and the contention window information is used to indicate the fallback initial value;
  • the first receiving unit 505 receives the back-off initial value sent by the base station, and the channel estimating unit 502 determines the back-off initial value received by the first receiving unit 505 as the back-off initial value;
  • the channel evaluation unit 502 acquires contention window information, and determines the fallback initial value according to the contention window information.
  • the UE 50 further includes a second receiving unit 506.
  • the second receiving unit 506 is configured to receive a notification message sent by the base station
  • the obtaining unit 501 is specifically configured to acquire, according to the notification information received by the second receiving unit 506, the first sending time point and the second sending time point;
  • the first transmission time point is obtained.
  • the sending unit 504 is further configured to: if the determining unit 503 determines that the actual sending time point is earlier than the second sending time point, between the actual sending time point and the second sending time point Transmitting a padding signal in the current uplink signal, and transmitting a useful signal in the current uplink signal from the second transmission time point.
  • the channel evaluation unit 502 is specifically configured to perform CCA in a first CCA time window before the first transmission time point.
  • the determining unit 503 is specifically configured to: if the signal energy detected by the channel assessment unit in the first CCA time window is not higher than an energy threshold, determine the location The actual transmission time point is the first transmission time point.
  • the channel evaluation unit 502 is further configured to: if the signal energy detected in the first CCA time window is higher than the energy threshold, in the second CCA time window before the third transmission time point Performing CCA; the third transmission time point is after the first transmission time point and before the second transmission time point.
  • the determining unit 503 is specifically configured to: if the signal energy detected by the channel assessment unit in the second CCA time window is not higher than the energy threshold, determine that the actual transmission time point is the third Send time point.
  • the third transmission time point belongs to the candidate transmission time point set. Additionally, the uplink signal is within a current burst time window, and the abrupt time window includes transmission of a downlink signal and the uplink signal.
  • the UE 50 further includes a third receiving unit 507.
  • the third receiving unit 507 is configured to receive an end time point of the current uplink signal sent by the base station.
  • the obtaining unit 501 is further configured to acquire an end time point of the current uplink signal according to the first sending time point.
  • the sending unit 504 in this embodiment may be the transmitter 203 of the UE, and the first receiving unit 505, the second receiving unit 506, and the third receiving unit 507 may be the receiver 202 of the UE.
  • the obtaining unit 501, the determining unit 503, and the channel evaluating unit 502 may be separately set up by the processor 201, or may be integrated in a processor of the UE, or may be stored in the memory 204 of the UE in the form of program code.
  • the functions of the above obtaining unit 501, determining unit 503, and channel evaluating unit 502 are called and executed by a certain processor of the UE.
  • the processor described herein can be a central processing unit or a specific integrated circuit.
  • the UE provided by the embodiment of the present invention can obtain the first transmission time point of the current uplink signal, and determine the actual transmission time point of the current uplink signal according to the first transmission time point and the result of the CCA operation, that is, the UE adjusts according to the indication of the base station.
  • the actual transmission time point is such that, since the first transmission time point determined by the base station is close to the time point at which the reference UE completes the CCA random backoff, the actual transmission time point of the current uplink signal determined by the UE according to the first transmission time point is also close to the reference UE.
  • Complete the CCA random retreat At the time point, it is possible to instruct each UE to perform uplink signal transmission as much as possible, thereby reducing mutual interference between UEs.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically 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 a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a readable storage medium. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a device (which may be a microcontroller, chip, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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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 de transmission de signal montant, un UE et une station de base, se rapportant au domaine des communications, ce procédé étant utilisé pour donner l'instruction à un UE d'envoyer simultanément un signal montant aussi loin que possible, et pouvoir réduire l'interférence mutuelle entre des UE. Le procédé comprend : une station de base qui détermine un premier point temporel d'envoi et un second point temporel d'envoi pour un UE, le premier point temporel d'envoi étant un point temporel où l'UE envoie un signal montant courant le plus tôt possible, le second point temporel d'envoi étant un point temporel d'envoi d'un signal utile dans le signal montant courant, et le second point temporel d'envoi n'étant pas antérieur au premier point temporel d'envoi; une station de base qui envoie, à l'UE, une signalisation de notification afin d'indiquer le premier point temporel d'envoi et le second point temporel d'envoi ou envoie à l'UE, une signalisation de notification afin d'indiquer le premier point temporel d'envoi; l'UE détermine, en fonction du premier point temporel d'envoi et du second point temporel d'envoi, un point temporel d'envoi réel lorsque le signal montant courant est envoyé; et l'UE commence à envoyer le signal montant courant depuis le point temporel d'envoi réel, et la station de base commence à recevoir le signal montant courant du second point temporel d'envoi.
PCT/CN2016/073564 2016-02-04 2016-02-04 Procédé de transmission de signal montant, équipement utilisateur (ue) et station de base WO2017132960A1 (fr)

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