WO2016101284A1 - Procédé et dispositif pour utiliser un spectre de fréquences non autorisé - Google Patents

Procédé et dispositif pour utiliser un spectre de fréquences non autorisé Download PDF

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Publication number
WO2016101284A1
WO2016101284A1 PCT/CN2014/095224 CN2014095224W WO2016101284A1 WO 2016101284 A1 WO2016101284 A1 WO 2016101284A1 CN 2014095224 W CN2014095224 W CN 2014095224W WO 2016101284 A1 WO2016101284 A1 WO 2016101284A1
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Prior art keywords
unlicensed spectrum
access network
network device
scheduling signaling
uplink scheduling
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PCT/CN2014/095224
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English (en)
Chinese (zh)
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严平
宁洪
康宏昊
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华为技术有限公司
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Priority to PCT/CN2014/095224 priority Critical patent/WO2016101284A1/fr
Priority to CN201480033262.6A priority patent/CN106063347B/zh
Publication of WO2016101284A1 publication Critical patent/WO2016101284A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for using an unlicensed spectrum.
  • the wireless spectrum can be divided into licensed spectrum and unlicensed spectrum.
  • the frequency band corresponding to the licensed spectrum is the frequency band used by the regulatory agency to be awarded to a specific wireless carrier through auction; the frequency band corresponding to the unlicensed spectrum is a frequency band that can be used freely by any wireless carrier.
  • more and more wireless operators are turning their attention to resource-rich unlicensed spectrum, hoping to offload wireless service data traffic by using unlicensed spectrum. .
  • User equipment is susceptible to interference from other wireless devices during the uplink transmission using unlicensed spectrum, resulting in data transmission errors, interruptions, or delays.
  • the embodiments of the present invention provide a method and device for using an unlicensed spectrum to improve the success rate of transmitting uplink data by the UE on an unlicensed spectrum.
  • a first aspect provides a method for using an unlicensed spectrum, where: an access network device receives scheduling request information sent by a user equipment UE, where the scheduling request information is used to request channel resources for uplink transmission; The device detects whether the unlicensed spectrum is idle; the access network device starts to occupy the unlicensed spectrum when detecting that the unlicensed spectrum is idle; and the access network device sends uplink scheduling signaling to the UE, where The uplink scheduling signaling is used to indicate the channel resource of the uplink transmission, where the channel resource of the uplink transmission is located on the unlicensed spectrum; and the access network device passes a predetermined time after starting to send the uplink scheduling signaling. Stopping the unlicensed spectrum; the access network device receives a data packet sent by the UE on the unlicensed spectrum, and the data packet is after the UE starts receiving the uplink scheduling signaling. Sent when the predetermined time elapses.
  • the access network device receives the scheduling request message sent by the UE. After the uplink scheduling signaling is sent to the UE, when the UE has not performed uplink transmission, the unlicensed spectrum is occupied, and other access network devices or other types are avoided.
  • the wireless device uses the unlicensed spectrum to transmit data before the uplink transmission of the UE, thereby effectively reducing the probability that the UE is interfered in the uplink transmission, and solving the problem of the UE data transmission error, interruption or delay.
  • the occupying the unlicensed spectrum includes: the access network device transmitting data on the unlicensed spectrum.
  • the data is any one of a padding sequence and a pseudo-random sequence.
  • the pseudo-random sequence can reduce the peak-to-average power ratio of the signal, that is, improve the power amplifier efficiency of the transmitter of the access network device.
  • the that the access network device sends uplink scheduling signaling to the UE includes: the access network device starts to occupy the The uplink scheduling signaling is sent to the UE while the spectrum is unlicensed.
  • the access network device sends the uplink scheduling signaling to the UE, where the access network device is occupying the non- When the licensed spectrum passes the time interval, the uplink scheduling signaling is sent to the UE.
  • the predetermined time is 4 transmission time intervals TTI.
  • the scheduling request information and the uplink scheduling signaling are transmitted on a licensed spectrum.
  • the scheduling request information and the uplink scheduling signaling are transmitted on the licensed spectrum to ensure the reliability of the control signaling transmission.
  • the uplink scheduling signaling is a first uplink scheduling signaling, where the data packet is a first data packet, the predetermined time a first predetermined time, the first data packet includes an amount of data to be transmitted in the uplink transmission buffer area of the UE, the method further includes: when the access network device finishes receiving the first data packet , The access network device starts to occupy the unlicensed spectrum; the access network device sends second uplink scheduling signaling to the UE according to the amount of data to be transmitted, and the second uplink scheduling signaling a channel resource for transmitting data to be transmitted in the uplink transmission buffer area of the UE, where the channel resource for transmitting data to be transmitted in the uplink transmission buffer area of the UE is located on the unlicensed spectrum; The network device stops occupying the unlicensed spectrum when a second predetermined time elapses after the sending of the second uplink scheduling signaling, and the access network device receives the second that is sent by
  • the technical solution provided by the embodiment of the present invention shows an uplink transmission scheduling algorithm.
  • the access network device receives the uplink scheduling signaling, and the UE does not transmit uplink information on the unlicensed spectrum, the access network device takes the initiative. Preempting the unlicensed spectrum, preventing other access network devices or other types of wireless devices from using the unlicensed spectrum to transmit data because the unlicensed spectrum is not detected, thereby effectively reducing the UE during the execution of the algorithm.
  • the probability of interference during uplink transmission avoids problems such as UE data transmission errors, interruptions or delays, and increases the accuracy and efficiency of data transmission on unlicensed spectrum.
  • the second uplink scheduling signaling is transmitted on the licensed spectrum.
  • the pseudo random sequence is an M sequence or a Golden sequence.
  • the second predetermined time is 4 transmission time intervals 4TTI
  • the time for starting to occupy the unlicensed spectrum to the stop occupying the unlicensed spectrum is that the access network device finish receiving the first data.
  • the time t2 elapsed from the time of the packet to the transmission of the second uplink scheduling signaling is added to the second predetermined time 4TTI, that is, 4TTI+t2.
  • a second aspect provides an access network device, including: a receiving unit, configured to receive scheduling request information sent by a user equipment UE, where the scheduling request information is used to request channel resources for uplink transmission; a processing unit, configured to detect whether the unlicensed spectrum is idle; the processing unit is further configured to start occupying the unlicensed spectrum when detecting that the unlicensed spectrum is idle; and sending, for detecting the non- When the licensed spectrum is idle, the uplink scheduling signaling is sent to the UE, and the uplink scheduling signaling is used to indicate the channel resource of the uplink transmission, where the channel resource of the uplink transmission is located on the unlicensed spectrum; The processing unit is further configured to stop occupying the unlicensed spectrum when the signaling unit starts transmitting the uplink scheduling, and the receiving unit is further configured to receive the UE in the unlicensed spectrum. And a data packet sent on, where the data packet is sent when the UE passes the predetermined time after starting to receive the uplink scheduling signaling.
  • the access network device provided by the embodiment of the present invention actively preempts the unlicensed spectrum when the UE receives the uplink scheduling signaling, and the UE does not send the uplink service data in the unlicensed spectrum, thereby avoiding other access network devices.
  • Or other types of wireless devices use the unlicensed spectrum to transmit data because the unlicensed spectrum is not occupied, thereby effectively reducing the probability of the UE being interfered in uplink transmission, and avoiding UE data transmission errors, interruptions, delays, and the like.
  • the problem is increased accuracy and efficiency in transmitting data over unlicensed spectrum.
  • the processing unit occupies the unlicensed spectrum includes: the processing unit triggers the sending unit to send data on the unlicensed spectrum.
  • the data is any one of a padding sequence and a pseudo-random sequence.
  • the pseudo-random sequence can reduce the peak-to-average power ratio of the signal, that is, improve the power amplifier efficiency of the transmitter of the access network device.
  • the sending, by the sending unit, the uplink scheduling signaling to the UE includes: the processing unit occupies the unlicensed spectrum The sending unit sends the uplink scheduling signaling to the UE.
  • the sending, by the sending unit, the uplink scheduling signaling to the UE includes: the processing unit occupies the unlicensed spectrum elapsed time During the interval, the sending unit sends the uplink scheduling signaling to the UE.
  • the predetermined time is 4 transmission time intervals TTI.
  • the scheduling request information received by the receiving unit and the uplink scheduling signaling sent by the sending unit are on an authorized spectrum. transmission.
  • the uplink scheduling signaling is a first uplink scheduling signaling, where the data packet is a first data packet, the predetermined time Is the first predetermined time, the first data packet received by the receiving unit includes an amount of data that needs to be transmitted in the uplink transmission buffer area of the UE; and the processing unit is further configured to: when the receiving unit finish receiving the The first data packet begins to occupy the unlicensed spectrum; the sending unit is further configured to send the second uplink scheduling signaling to the UE according to the quantity of the data to be transmitted, where the second uplink scheduling signal is And a channel resource for indicating data to be transmitted in the uplink transmission buffer, where the channel resource for transmitting data to be transmitted in the uplink transmission buffer of the UE is located on the unlicensed spectrum;
  • the processing unit is further configured to stop occupying the unlicensed spectrum when a second predetermined time elapses after the start sending unit sends the second uplink scheduling signaling; the receiving unit is further configured to receive the UE a second data packet sent on the unlicensed spectrum, where the second data packet is sent by the UE when the second uplink scheduling signaling is started to receive the second predetermined time.
  • the foregoing technical solution provided by the embodiment of the present invention provides an uplink transmission scheduling algorithm, where the access network device receives uplink scheduling signaling when the UE does not uplink transmission on the unlicensed spectrum, and the access network device Actively preempting the unlicensed spectrum, preventing other access network devices or other types of wireless devices from using the unlicensed spectrum to transmit data because the unlicensed spectrum is not detected, thereby effectively reducing the UE during the execution of the algorithm.
  • the probability of being interfered in the uplink transmission avoids problems such as UE data transmission errors, interruptions or delays, and increases the accuracy and efficiency of data transmission on the unlicensed spectrum.
  • the second uplink scheduling signaling sent by the sending unit is transmitted on the licensed spectrum.
  • the pseudo-random sequence is an M sequence or a Golden sequence.
  • the second predetermined time is 4 transmission time intervals 4TTI
  • the processing unit starts to occupy the unlicensed spectrum to stop occupying the unlicensed spectrum, when the access network device finishes receiving the first data packet.
  • the time t2 elapsed when the second uplink scheduling signaling is sent is added to the second predetermined time 4TTI, that is, 4TTI+t2.
  • the access network device receives the scheduling request information sent by the UE, and after detecting that the unlicensed spectrum is available, after the uplink scheduling signaling is sent to the UE, the UE has not performed uplink.
  • the unlicensed spectrum is occupied, and other access network devices or other types of wireless devices are prevented from using the unlicensed spectrum to transmit data before the uplink transmission of the UE, thereby effectively reducing the probability of the UE being interfered in uplink transmission. Solved the problem of UE data transmission error, interruption or delay.
  • FIG. 1 is a flowchart of a method for using an unlicensed spectrum according to an embodiment of the present invention
  • 3a is an interaction flowchart of a method for using an unlicensed spectrum in an FDD-LTE system according to an embodiment of the present invention
  • FIG. 3b is a time domain flowchart of a method for using an unlicensed spectrum in an FDD-LTE system according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of an apparatus for using an unlicensed spectrum according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another device using an unlicensed spectrum according to an embodiment of the present invention.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal frequency-division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • a CDMA network may implement wireless technologies such as universal terrestrial radio access (UTRA), CDMA2000, and the like.
  • UTRA can include variants of CDMA (WCDMA) and other CDMA.
  • CDMA2000 can cover the Interim Standard (IS) 2000 (IS-2000), IS-95 and IS-856 standards.
  • An OFDMA network may implement wireless technologies such as evolved universal radio access (E-UTRA), ultra mobile broadband (UMB), and Flash OFDMA.
  • E-UTRA and E-UTRA are UMTS and UMTS evolved versions.
  • 3GPP is a new version of UMTS that uses E-UTRA in long term evolution (LTE) and LTE Advanced (LTE-A).
  • LTE long term evolution
  • LTE-A LTE Advanced
  • UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in the documentation of the 3GPP standards organization.
  • CDMA2000 and UMB are described in the documentation of the 3GPP2 standards organization.
  • the technology described in the embodiments of the present invention can also be applied to the wireless network and the wireless technology described above.
  • the existing uplink data scheduling scheme there is a certain transmission interval between the UE receiving the uplink scheduling signaling and actually starting the uplink transmission data. If the access network device or other type of wireless device in other communication systems, If the wireless access point (AP) in the walkie-talkie and wireless-fidelity (Wi-Fi) technology detects the unlicensed spectrum idle during this transmission interval, the unlicensed spectrum is used. When the data is transmitted, the UE may be seriously interfered with the uplink transmission of the unlicensed spectrum, causing problems such as uplink data transmission errors, interruptions, or delays.
  • AP wireless access point
  • Wi-Fi wireless-fidelity
  • the communication system provided by the embodiment of the present invention includes an access network device and a user equipment UE, and the access network device and the UE may be used to implement the method provided by the embodiment of the present invention.
  • the access network device may provide communication coverage of a specific physical area, and is used to connect the UE to the network and perform communication.
  • the access network device may be a base station or the like, and may be a macro base station or a small base station.
  • the access network device may be an eNodeB, or may be a small base station such as a home eNodeB (HeNB, home eNodeB), an AP, a micro base station, or a pico base station. .
  • the access network device may include a Node B and a Radio Network Controller (RNC).
  • RNC Radio Network Controller
  • the access network device may include a base station controller (BSC), a base transceiver station (BTS), and the like.
  • BSC base station controller
  • BTS base transceiver station
  • the UEs may be distributed throughout the wireless network, and each UE may be static or mobile.
  • a UE may be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like.
  • the UE can be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld, a laptop computer, a cordless phone (cordless) Phone), wireless local loop (WLL) station, etc.
  • PDA personal digital assistant
  • WLL wireless local loop
  • the access network device may use the licensed spectrum to establish a synchronization relationship with the UE before the transmission, or may use the authorized spectrum to send or receive control signaling, for example, by using a physical uplink control channel (PUCCH).
  • the spectrum receives the scheduling request indication (SRI) sent by the UE, and sends downlink control information (DCI, downlink control information) to the UE through the physical downlink control channel (PDCCH).
  • SRI scheduling request indication
  • DCI downlink control information
  • PDCH physical downlink control channel
  • the access network device may schedule the UE to transmit data on the licensed spectrum. When the licensed spectrum resource is insufficient, the UE may also be scheduled to transmit data on the unlicensed spectrum.
  • the embodiment of the present invention is a case where an access network device schedules a UE to transmit data on an unlicensed spectrum.
  • FIG. 1 is a schematic flowchart of a method for using an unlicensed spectrum according to an embodiment of the present invention. As shown in FIG. 1 , the method includes:
  • the access network device receives scheduling request information sent by the UE, where the scheduling request information is used to request channel resources for uplink transmission.
  • the UE may send scheduling request information to the access network device.
  • the UE may send scheduling request information to the access network device by using a PUCCH.
  • the scheduling request information may be an SRI, and the access network device is notified that the UE has data to be transmitted, and allocates channel resources for the uplink transmission request.
  • the access network device detects whether an unlicensed spectrum is idle.
  • the access network device When the access network device receives the scheduling request information sent by the UE, it detects whether the unlicensed spectrum is idle. For example, the access network device may perform carrier sensing (CS) on the unlicensed spectrum to detect whether the unlicensed spectrum is idle.
  • CS carrier sensing
  • the access network device starts to occupy the unlicensed spectrum when detecting that the unlicensed spectrum is idle.
  • the access network device occupies the idle unlicensed spectrum, so that other access network devices cannot use the unlicensed spectrum, including other radio access technology (RAT) systems or other carrier systems.
  • RAT radio access technology
  • the unlicensed spectrum cannot be used by the access network devices in the medium.
  • the access network device may send data on the unlicensed spectrum to implement occupation of the unlicensed spectrum, that is, when the access network device detects that the unlicensed spectrum is idle, the access network device starts. Transmitting data on the unlicensed spectrum.
  • the data can be a padding sequence.
  • the padding sequence may be all 0s or all 1 sequences, and does not represent any meaning but enables other access network devices or other types of wireless communication devices to consider the segment of the unlicensed spectrum to be non-idle.
  • the data may also be a pseudo-random sequence, and the pseudo-random sequence may be used to reduce the peak-to-average power ratio (PAPR) of the signal, that is, the power amplifier efficiency of the transmitter of the access network device is improved.
  • PAPR peak-to-average power ratio
  • the pseudo-random sequence can be an M sequence or a Golden sequence.
  • the access network device when the access network device detects that the unlicensed spectrum is idle, the access network device starts to occupy the unlicensed spectrum, and the access network device may detect the location.
  • the access network device starts to occupy the unlicensed spectrum at the same time.
  • the access network device when the access network device detects that the unlicensed spectrum is idle, the access network device starts to occupy the unlicensed spectrum, and the access network device is also included. When it is detected that the unlicensed spectrum is idle, the situation of occupying the unlicensed spectrum begins to be started in a very short time and close to the same time.
  • the embodiments of the present invention are further described as a supplement and not a limitation.
  • the access network device sends uplink scheduling signaling to the UE, where the uplink scheduling signaling is used to indicate a channel resource of the uplink transmission, where the channel resource of the uplink transmission is located on the unlicensed spectrum.
  • the uplink scheduling signaling may include specific frequency point information, a modulation and coding manner, and the like of the uplink transmission of the UE.
  • the content of the uplink scheduling signaling may be an uplink grant (UL grant), and the format of the uplink scheduling signaling is DCI format 0 (DCI format 0).
  • the uplink scheduling signaling may be sent on the licensed spectrum, and when sent on the licensed spectrum, the reliability of the uplink scheduling signaling transmission may be increased. Alternatively, the uplink scheduling signaling may also be sent on an unlicensed spectrum.
  • the access network device may send the uplink scheduling signaling when the unlicensed spectrum starts to be occupied, that is, the access network device sends the uplink scheduling signal while starting to occupy the unlicensed spectrum. Let the UE.
  • the access network device may also send the uplink scheduling signaling to the UE after a period of time after occupying the unlicensed spectrum. For example, when there are a large number of UEs in the access network device that need to be scheduled, the UE may not be scheduled to transmit data when the spectrum is occupied, but the other UEs are first scheduled to transmit data, and the scheduling device is dispatched after the time period elapses. If the UE transmits data, or the priority of the UE requesting scheduling is lower than that of other UEs, the other UEs may be preferentially scheduled, and then, after the time period is elapsed, the UE is scheduled again, and the normal guarantee office may be used.
  • the access network device stops occupying the unlicensed spectrum when a predetermined time elapses after starting to send the uplink scheduling signaling.
  • the predetermined time may be a time elapsed after the UE starts to receive the uplink scheduling signaling to the actual transmission, and may have different specifications in different communication protocols, or may be between the access network device and the UE.
  • a time elapsed after the UE starts to receive the uplink scheduling signaling to the actual transmission may have different specifications in different communication protocols, or may be between the access network device and the UE.
  • TTIs transmission time intervals
  • 1 TTI may be 1 ms.
  • the time is 4TTI; or, in the scenario that the access network device starts to occupy the unlicensed spectrum and sends the uplink scheduling signaling after a period of time, if the time period is t1, the access network device starts to occupy
  • the elapsed time from the unlicensed spectrum to the stop of occupying the unlicensed spectrum is 4TTI+t1. It should be noted that there should be no delay or delay in the transmission and reception of the uplink scheduling signaling, so that the access network device can start transmitting the uplink scheduling signaling at a predetermined time and the UE. The time point at which the reception of the uplink scheduling signaling starts to pass the predetermined time is consistent.
  • the access network device receives a data packet sent by the UE on the unlicensed spectrum, where the data packet is sent when the UE passes the predetermined time after starting to receive the uplink scheduling signaling.
  • the access network device When the access network device stops occupying the unlicensed spectrum, it starts to receive the data packet sent by the UE. It should be noted that, in actual situations, the conversion of the RF channel from the uplink transmission state to the uplink reception state in the access network device requires a certain transmission and reception state transition time. Therefore, in actual operation, the time for occupying the unlicensed spectrum may be slightly shorter.
  • the foregoing time for example, the time when the occupation is stopped, is preset in advance, and the preset time may be determined according to the performance of the radio frequency device of the access network device, for example, 10 ⁇ s, 20 ⁇ s, or 30 ⁇ s. Since the transceiving state transition time is very short, it can be ignored. meter.
  • the transceiver status transition time may not be counted in the time when the access network device occupies the unlicensed spectrum, or if the transceiver status transition time is separately counted And the sum of the transmission and reception switching time and the occupied time of the unlicensed spectrum is equal to the length of time between the UE starting to receive the uplink scheduling signaling and sending the data packet.
  • the access network device receives the scheduling request information sent by the UE, and after detecting that the unlicensed spectrum is available, after the uplink scheduling signaling is sent to the UE, the UE has not performed uplink.
  • the unlicensed spectrum is occupied, and other access network devices or other types of wireless devices are prevented from using the unlicensed spectrum to transmit data before the uplink transmission of the UE, thereby effectively reducing the probability of the UE being interfered in uplink transmission.
  • the problem of UE data transmission error, interruption or delay is avoided, and the accuracy and efficiency of transmitting data on the unlicensed spectrum are increased.
  • FIG. 2 is a schematic flowchart diagram of another method for using an unlicensed spectrum according to an embodiment of the present invention. As shown in FIG. 2, the method includes the steps in FIG. 1, and S101-S106 may refer to the description of steps S101-S106 in the method embodiment shown in FIG. 1.
  • the uplink scheduling signaling in S104-S106 is first uplink scheduling signaling
  • the data packet is a first data packet
  • the predetermined time is a first predetermined time
  • the S106 is The data packet includes the amount of data to be transmitted in the uplink transmission buffer area of the UE.
  • the amount of data can be carried in a buffer status report (BSR).
  • BSR buffer status report
  • the access network device finishes receiving the first data packet, the access network device starts to occupy the unlicensed spectrum.
  • the access network device can transmit data on the unlicensed spectrum to achieve reoccupation of the unlicensed spectrum.
  • the data can be a padding sequence.
  • the padding sequence may be all 0s or all 1 sequences, and does not represent any meaning but enables other access network devices or other types of wireless communication devices to consider the segment of the unlicensed spectrum to be non-idle.
  • the data may also be a pseudo-random sequence, and the pseudo-random sequence may be used to reduce the PAPR of the signal, that is, to improve the power amplifier efficiency of the transmitter of the access network device.
  • the pseudo-random sequence can be an M sequence or a Golden sequence.
  • the connection The network access device starts to occupy the unlicensed spectrum, and the access network device starts to receive the first data packet and starts to occupy the unlicensed spectrum again.
  • the time interval is very short, such as 10 ⁇ s, 20 ⁇ s, etc., because the time interval is very short, so that the other The wireless access device does not have time to occupy the unlicensed spectrum, so the time interval of existence can be negligible.
  • the access network device sends, according to the quantity of the data to be transmitted, the second uplink scheduling signaling to the UE, where the second uplink scheduling signaling is used to indicate that the uplink transmission buffer area of the UE is transmitted.
  • a channel resource of data to be transmitted, where the channel resource for transmitting data to be transmitted in the uplink transmission buffer area of the UE is located on the unlicensed spectrum.
  • the access network device After receiving the first data packet, the access network device parses the first data packet to obtain the amount of data to be transmitted in the uplink transmission buffer area of the UE.
  • the access network device may determine a channel resource size allocated to the UE for uplink transmission according to the amount of data to be transmitted in the uplink transmission buffer area of the UE.
  • the second uplink scheduling signaling may include specific frequency point information, a modulation and coding manner, and the like of the uplink transmission of the UE.
  • the format of the second uplink scheduling signaling may be DCI format 0.
  • the access network device stops occupying the unlicensed spectrum when a second predetermined time passes after starting to send the second uplink scheduling signaling.
  • the second predetermined time may be a time elapsed when the UE starts to receive the second uplink scheduling signaling to the actual line transmission, may have different specifications in different communication protocols, or may be used by the access network device and the The UE determines the negotiation between the UEs. For example, there may be 4 TTIs in the FDD-LTE system.
  • the access network device starts to occupy the unlicensed spectrum again and stops occupying again.
  • the elapsed time of the unlicensed spectrum may be t2+4TTI.
  • the access network device receives a second data packet that is sent by the UE on the unlicensed spectrum, where the second data packet is that the UE passes after receiving the second uplink scheduling signaling. Sent when the second predetermined time is stated.
  • the access network device may start receiving the second data packet sent by the UE when the occupation of the unlicensed spectrum is stopped.
  • the conversion of the RF channel from the uplink transmission state to the uplink reception state in the access network device requires a certain transmission and reception state transition time. Therefore, in actual operation, the time for occupying the unlicensed spectrum may be slightly shorter.
  • the foregoing time such as the time point of stopping the occupation, is preset in advance, and the preset time may be determined according to the performance of the radio frequency device of the access network device, for example, 10 ⁇ s, 20 ⁇ s, or 30 ⁇ s. Since the transceiving state transition time is very short, it can be ignored.
  • the transceiver status transition time may not be counted in the time when the access network device occupies the unlicensed spectrum, or if the transceiver status transition time is separately counted
  • the sum of the transmission and reception switching time and the occupied time of the unlicensed spectrum is equal to the length of time between the start of receiving the second uplink scheduling signaling by the UE and sending the second data packet.
  • the technical solution provided by the embodiment of the present invention shows an uplink transmission scheduling algorithm.
  • the access network device receives the uplink scheduling signaling, and the UE does not transmit uplink information on the unlicensed spectrum, the access network device takes the initiative. Preempting the unlicensed spectrum, preventing other access network devices or other types of wireless devices from using the unlicensed spectrum to transmit data because the unlicensed spectrum is not detected, thereby effectively reducing the UE during the execution of the algorithm.
  • the probability of interference during uplink transmission avoids problems such as UE data transmission errors, interruptions or delays, and increases the accuracy and efficiency of data transmission on unlicensed spectrum.
  • FIG. 3a is a schematic flowchart of a method for using an unlicensed spectrum in an LTE system using frequency division duplexing according to an embodiment of the present invention. As shown in Figure 3a, the method includes:
  • the UE sends an SRI to the eNodeB on the uplink authorized spectrum.
  • the UE After establishing synchronization with the eNodeB, the UE maintains an uplink synchronization state, and obtains an SRI subframe position and a transmission period configured by the eNodeB. If new data needs to be transmitted, the UE may perform the PUCCH.
  • the SRI is transmitted on the right spectrum, and the eNodeB can obtain the SRI sent by the UE on the uplink licensed spectrum through the PUCCH.
  • the eNodeB detects whether the uplink unlicensed spectrum is idle.
  • the detecting method may be performing carrier sensing on the unlicensed spectrum.
  • S303 If it is detected that the licensed spectrum is occupied, S303 is performed; if the unlicensed spectrum is detected to be idle, S305 is performed.
  • the eNodeB determines whether the waiting time accumulated from the reception of the SRI transmitted by the UE exceeds the time T'.
  • S304 is executed; if the accumulated waiting time does not exceed the time T', then S302 is executed after the waiting time T.
  • T' and T can be preset and T' is greater than T.
  • the eNodeB schedules the UE to perform uplink transmission on the licensed spectrum.
  • T' may be a relatively long time
  • the eNodeB may preferentially schedule the UE to transmit data on the licensed spectrum.
  • S305 The eNodeB immediately starts to occupy the unlicensed spectrum, and simultaneously sends the DCI to the UE on the downlink authorized spectrum, and the occupied time is 4TTI.
  • the eNodeB occupies the unlicensed spectrum after 4TTI, and performs step S306;
  • the UE sends the first data packet to the unlicensed spectrum, and the eNodeB receives the first data packet sent by the UE on the unlicensed spectrum, where the first data packet includes a BSR;
  • the eNodeB parses the first data packet to obtain a data quantity of data to be transmitted in the uplink transmission buffer area of the UE included in the BSR.
  • the eNodeB determines whether the data volume of the data to be transmitted in the uplink transmission buffer area of the UE indicated by the BSR is greater than 0.
  • the eNodeB determines, according to information about the amount of data to be transmitted in the uplink transmission buffer area of the UE, the number N of data packets that the UE needs to transmit.
  • the eNodeB sequentially sends N DCIs to the UE sequentially on the downlink authorized spectrum according to the number N of data packets determined by S310.
  • S312 is sent from S311 after the first DCI is sent, and S312 is performed;
  • S312 The eNodeB stops occupying the unlicensed spectrum, and receives the second data packet to the N+1th data packet that the UE sequentially sends on the unlicensed spectrum.
  • the eNodeB immediately stops the occupation of the unlicensed spectrum, and ends the process.
  • FIG. 3b is a time domain flowchart of a method for using an unlicensed spectrum in an FDD-LTE system according to an embodiment of the present invention, which is an operation branch of the eNodeB in FIG. 3a detecting an unlicensed spectrum idle.
  • Figure 3b shows the behavior of the eNodeB and the UE in the time dimension using the method of unlicensed spectrum, the time period indicating the eNodeB occupies the unlicensed spectrum, and the transmission mode of the eNodeB and UE in S311 and S312 in Figure 3a.
  • Figure 3a can be better understood with reference to Figure 3b, but Figure 3b cannot be considered a limitation to Figure 3a.
  • the eNodeB detects the execution method of the eNodeB and the UE in the branch where the unlicensed spectrum is available. As shown in FIG. 3b, the UE transmits the channel resource of the uplink transmission on the uplink licensed spectrum, and the eNodeB detects that the unlicensed spectrum is idle. The eNodeB occupies the unlicensed spectrum while transmitting the DCI on the downlink licensed spectrum, and the occupied time is 4TTI.
  • the UE sends the first data packet on the unlicensed spectrum, where the BSR is included; the eNodeB receives the first data packet, and starts to occupy the unlicensed spectrum again when the first data packet is received, and the occupation time is 4TTI+
  • t2 refer to the related expression in S207 in Fig. 2.
  • the eNodeB parses the first data packet to obtain the amount of data that the BSR indicates the uplink transmission of the UE, and determines the number of data packets that the UE needs to uplink again according to the amount of data that needs to be uplinked in the uplink transmission buffer area of the BSR. And sequentially transmitting N DCIs to the UE on the downlink authorized spectrum frequency point; the eNodeB receives the second data packet to the N+1th data packet sent by the UE on the unlicensed spectrum.
  • the embodiment of the present invention further provides an access network device, as shown in FIG. 4, which is an access method according to an embodiment of the present invention.
  • FIG. 4 Schematic diagram of the structure of the network device.
  • the access network device 400 includes a receiving unit 410, a processing unit 420, and a transmitting unit 430.
  • the receiving unit 410 is configured to receive scheduling request information sent by the user equipment UE, where the scheduling request information is used to request channel resources for uplink transmission.
  • the scheduling request information is sent.
  • the UE may send scheduling request information to the access network device in the PUCCH.
  • the scheduling request information may be an SRI, and the access network device 400 is notified that the data needs to be transmitted, and the channel resource is allocated for the uplink transmission request.
  • the processing unit 420 is configured to detect whether the unlicensed spectrum is idle.
  • processing unit 420 can perform carrier sensing on the unlicensed spectrum to detect if the unlicensed spectrum is idle.
  • the processing unit 420 is further configured to start occupying the unlicensed spectrum when detecting that the unlicensed spectrum is idle.
  • the processing unit 420 occupies the idle unlicensed spectrum, so that other access network devices cannot use the unlicensed spectrum, including other RAT systems, or the access network devices in other carrier systems cannot use the unauthorized Spectrum.
  • the processing unit 420 may be configured to send data on the unlicensed spectrum by using the trigger sending unit 430 to implement occupation of the unlicensed spectrum, that is, when the access network device detects that the unlicensed spectrum is idle, the sending unit 430 begins transmitting data on the unlicensed spectrum.
  • the data can be a padding sequence.
  • the padding sequence may be all 0s or all 1 sequences, and does not represent any meaning but enables other access network devices or other types of wireless communication devices to consider the segment of the unlicensed spectrum to be non-idle.
  • the data can also be a pseudo-random sequence. The use of a pseudo-random sequence can reduce the PAPR of the signal, that is, improve the power amplifier efficiency of the transmitter of the access network device.
  • the pseudo-random sequence can be an M sequence or a Golden sequence.
  • the processing unit 420 starts to occupy the unlicensed spectrum when detecting that the unlicensed spectrum is idle, and the processing unit 420 may start to detect that the unlicensed spectrum is idle. Occupy the unlicensed spectrum. In actual situations, there may be a time interval between detecting idle and starting occupancy, but this time interval is very short, such as 10 ⁇ s, 20 ⁇ s, etc., because the time interval is very short, so that other wireless access devices can not take up the non- The spectrum is licensed, so this interval can be negligible.
  • the processing unit 420 when the processing unit 420 detects that the unlicensed spectrum is idle, the situation of starting to occupy the unlicensed spectrum also includes the processing unit 420 detecting that the unlicensed spectrum is idle. A situation in which the unlicensed spectrum is occupied after a very short time and approaching.
  • the embodiments of the present invention are further described as a supplement and not a limitation.
  • the sending unit 430 is configured to send the uplink scheduling signaling to the UE when the unlicensed spectrum is idle, and the uplink scheduling signaling is used to indicate the channel resource of the uplink transmission, where the uplink transmission is Channel resources are located on the unlicensed spectrum.
  • the uplink scheduling signaling may include specific frequency point information, a modulation and coding manner, and the like of the uplink transmission of the UE.
  • the content of the uplink scheduling signaling may be a UL Grant, and the format of the uplink scheduling signaling is DCI format 0.
  • the uplink scheduling signaling may be sent on the licensed spectrum, and when sent on the licensed spectrum, the reliability of the uplink scheduling signaling transmission may be increased. Alternatively, the uplink scheduling signaling may also be sent on an unlicensed spectrum.
  • the sending unit 430 sends the first uplink scheduling signaling, that is, the time point that the processing unit 420 starts to occupy the unlicensed spectrum and the sending unit 430.
  • the time point at which the first scheduling signaling is sent is the same.
  • the sending unit 430 may also send the first scheduling signaling after waiting for the time interval after the processing unit 420 starts to occupy the unlicensed spectrum.
  • the time interval is very short, that is, in the case of close to 0, the transmitting unit 430 transmits the uplink scheduling signaling when the processing unit 420 starts to occupy the unlicensed spectrum.
  • the processing unit 420 is further configured to stop occupying the unlicensed spectrum when the sending unit starts sending the uplink scheduling signaling for a predetermined time.
  • the predetermined time may be a time elapsed after the UE starts to receive the uplink scheduling signaling to the actual transmission, and may have different specifications in different communication protocols, or may be between the access network device and the UE.
  • Negotiate and determine For example, there may be 4 TTIs in the FDD-LTE system.
  • the processing unit 420 starts to occupy the unlicensed spectrum, and the sending unit 430 sends the first uplink scheduling signaling to the UE, the processing unit 420 starts to occupy the unlicensed spectrum to stop occupying the non-
  • the elapsed time of the licensed spectrum is 4TTI; in the case that the sending unit 430 sends the uplink scheduling signaling to the UE after the processing unit 430 starts to occupy the unlicensed spectrum and waits for the time interval t1, it is 4TTI+t1.
  • the delay and the delay of the transmission and reception of the uplink scheduling signaling should be negligible, so as to ensure that the access network device sends the uplink scheduling signaling at a predetermined time and receives the UE.
  • the uplink scheduling signaling is consistent at the time point of the predetermined time.
  • the receiving unit 410 is further configured to receive a data packet sent by the UE on the unlicensed spectrum, where the data packet is sent when the UE passes the predetermined time after starting to receive the uplink scheduling signaling.
  • the processing unit 420 stops occupying the unlicensed spectrum
  • the sending unit 430 starts to receive the data packet sent by the UE.
  • the transition of the radio frequency channel from the uplink transmission state to the uplink reception state in the access network device 400 requires a certain transceiving state transition time. Therefore, in actual operation, the time for occupying the unlicensed spectrum may be slightly shorter.
  • the preset time is determined according to the radio frequency device of the access network device, for example, 10 ⁇ s, 20 ⁇ s or 30 ⁇ s. Since the transceiving state transition time is very short, it can be ignored.
  • the transceiving state transition time may not be included in the time when the unlicensed spectrum is occupied, or the transceiver transceiving is performed if the transceiving state transition time is separately counted.
  • the sum of the time and the occupied time of the unlicensed spectrum is equal to the length of time between the start of receiving the uplink scheduling signaling by the UE and transmitting the data packet.
  • the foregoing uplink scheduling signaling is a first uplink scheduling signaling, where the data packet is a first data packet, the predetermined time is a first predetermined time, and the first data packet may include The amount of data that needs to be transmitted in the uplink transmission buffer of the UE.
  • the amount of the data may be carried in the BSR.
  • the processing unit 420 is further configured to start occupying the unlicensed spectrum when the receiving unit finishes receiving the first data packet.
  • the processing unit 420 may be configured to trigger the transmission unit 430 to resend data on the unlicensed spectrum to implement occupation of the unlicensed spectrum.
  • the processing unit 420 when the receiving unit 410 completes receiving the first data packet, the processing unit 420 starts to occupy the unlicensed spectrum, and the receiving unit 410 may complete receiving the first data packet. At the same time, the processing unit 420 begins to occupy the unlicensed spectrum. In the actual situation, there may also be a time interval between receiving the first data packet and starting to occupy the unlicensed spectrum, but the time interval is very short, such as 10 ⁇ s, 20 ⁇ s, etc., because the time interval is very short, so that other wireless The access device does not have time to occupy the unlicensed spectrum, so the time interval of existence can be negligible.
  • the processing unit 420 parses the first data packet to obtain an amount of data that needs to be transmitted in the uplink transmission buffer area of the UE.
  • the access network device may determine a channel resource size allocated to the UE for uplink transmission according to an amount of data that needs to be uplinked in the uplink transmission buffer area of the UE.
  • the sending unit 430 is further configured to send the second uplink scheduling signaling to the UE, where the uplink scheduling signaling is used to indicate the channel resource of the uplink transmission, where the channel resource of the uplink transmission is located on the unlicensed spectrum.
  • the processing unit 420 is further configured to stop occupying the unlicensed spectrum when the second predetermined time elapses after the sending unit 430 sends the second uplink scheduling signaling.
  • the second predetermined time may be after the UE starts to receive the uplink scheduling signaling and then transmits the data to the actual line.
  • the elapsed time may have different specifications in different communication protocols, or may be determined by negotiation between the access network device and the UE. For example, there may be 4 TTIs in the FDD-LTE system.
  • the time elapsed by the processing unit 420 to start occupying the unlicensed spectrum again to stop occupying the unlicensed spectrum may be t2+4TTI.
  • the receiving unit 410 is further configured to receive a second data packet sent on the unlicensed spectrum, where the second data packet is sent when the UE passes the second predetermined time after starting to receive the second uplink scheduling signaling. .
  • the receiving unit 410 may start to receive the second data packet sent by the UE.
  • the conversion of the radio frequency channel from the uplink transmission state to the uplink reception state in the device 400 requires a certain transceiving state transition time. Therefore, in actual operation, the time for occupying the unlicensed spectrum may be slightly shorter than the above time.
  • the preset time can be determined according to the performance of the radio device of the real access network device, for example, 10 ⁇ s, 20 ⁇ s or 30 ⁇ s. Since the transceiving state transition time is very short, it can be ignored.
  • the transceiver status transition time may not be counted in the time when the processing unit 420 occupies the unlicensed spectrum, or if the transceiver status transition time is separately counted,
  • the sum of the transceiving transition time and the occupied time is equal to the length of time between the UE starting to receive the second uplink scheduling signaling and sending the second data packet.
  • the access network device provided by the embodiment of the present invention actively preempts the unlicensed spectrum when the UE receives the uplink scheduling signaling, and the UE does not send the uplink service data in the unlicensed spectrum, thereby avoiding other access network devices.
  • Or other types of wireless devices use the unlicensed spectrum to transmit data because the unlicensed spectrum is not occupied, thereby effectively reducing the probability of the UE being interfered in uplink transmission, and avoiding UE data transmission errors, interruptions, delays, and the like.
  • the problem is increased accuracy and efficiency in transmitting data over unlicensed spectrum.
  • FIG. 5 is a schematic structural diagram of another device using an unlicensed spectrum according to an embodiment of the present invention.
  • device 500 includes a processor 510, a memory 520, a communication interface 530, and a bus 540 that stores execution instructions that, when the device is running, the processor 510 and the storage
  • the devices 520 are in communication via a bus 530, which receives information via the communication interface 530 and performs the steps of all disclosed methods of the embodiments of the present invention in accordance with computer instructions stored in the memory 520.
  • the processing unit 420 in the embodiment of the present invention provided in FIG. 4 may correspond to the processor 510 herein, that is, the processor 510 can implement all functions that the processing unit 420 can implement.
  • the receiving unit 410 and the sending unit 430 in the embodiment of the present invention provided in FIG. 4 can correspond to the communication interface 530 herein, that is, the communication interface 530 can implement all the functions that the receiving unit 410 and the sending unit 430 can implement.
  • the processor 510 can be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, and discrete hardware. Component.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the access network device 500 can also implement or perform the various methods, steps, and logic blocks disclosed in the various embodiments of the present invention. The steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the computer instructions can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in memory 520, and processor 510 reads the information in memory 520 and, in conjunction with its hardware, performs the steps of the methods of the various embodiments.

Abstract

La présente invention concerne un procédé et un dispositif pour utiliser un spectre de fréquences non autorisé. Un dispositif de réseau d'accès reçoit des informations de requête de planification transmises par un équipement utilisateur (UE) ; le dispositif de réseau d'accès détecte si le spectre de fréquences non autorisé est ou non au repos ; le dispositif de réseau d'accès commence à occuper le spectre de fréquences non autorisé lors de la détection du fait que le spectre de fréquences non autorisé est au repos ; le dispositif de réseau d'accès transmet une signalisation de planification de liaison montante à l'UE ; le dispositif de réseau d'accès arrête d'occuper le spectre de fréquences non autorisé après une période de temps préétablie à partir du début de la transmission de signalisation de planification de liaison montante ; et le dispositif de réseau d'accès reçoit des paquets de données transmis par l'UE dans le spectre de fréquences non autorisé. Grâce à un mode de réalisation de la présente invention, par l'occupation à l'avance du spectre de fréquences non autorisé, une probabilité que l'UE soit perturbé durant une transmission en liaison montante est efficacement réduite, et les problèmes d'erreurs, d'interruptions ou de retards, et ainsi de suite, de transmission de données d'UE sont résolus.
PCT/CN2014/095224 2014-12-27 2014-12-27 Procédé et dispositif pour utiliser un spectre de fréquences non autorisé WO2016101284A1 (fr)

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CN201480033262.6A CN106063347B (zh) 2014-12-27 2014-12-27 使用非授权频谱的方法和设备

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