WO2018018638A1 - Procédé et dispositif de communication sur bande de fréquences sans licence - Google Patents

Procédé et dispositif de communication sur bande de fréquences sans licence Download PDF

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Publication number
WO2018018638A1
WO2018018638A1 PCT/CN2016/092431 CN2016092431W WO2018018638A1 WO 2018018638 A1 WO2018018638 A1 WO 2018018638A1 CN 2016092431 W CN2016092431 W CN 2016092431W WO 2018018638 A1 WO2018018638 A1 WO 2018018638A1
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Prior art keywords
lte
wlan
transceiver
channel resource
channel
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PCT/CN2016/092431
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English (en)
Chinese (zh)
Inventor
桑超强
蒋摇
夏鹏飞
刘庆文
吴俊�
郑娟
马莎
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华为技术有限公司
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Priority to PCT/CN2016/092431 priority Critical patent/WO2018018638A1/fr
Publication of WO2018018638A1 publication Critical patent/WO2018018638A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

Definitions

  • the present invention relates to the field of network technologies, and in particular, to a method and apparatus for communicating on an unlicensed frequency band.
  • LTE Long-Term Evolution
  • UMTS universal mobile telecommunications system
  • 3GPP Third Generation Partnership Project
  • the long-term evolution mainly refers to the communication technology in the 3GPP LTE fourth generation cellular mobile communication system.
  • WiFi mainly refers to IEEE 802.11 wireless local area network communication technology represented by IEEE 802.11n and IEEE 802.11ac. Strictly speaking, WiFi is the name of the WiFi Industry Alliance. The specific technical name should be Wireless Local Area Network (WLAN).
  • WLAN Wireless Local Area Network
  • the LTE system has so far mainly worked in the licensed spectrum that needs to be licensed.
  • the base station (English: eNodeB, eNB) directly transmits various signals to the user equipment in the unlicensed band.
  • UE User Equipment
  • the UE directly transmits various signals to the eNB in the unlicensed band, and does not need to perform clear channel assessment or pre-session listening before transmission (English: listen- Before-talk)
  • this approach makes it impossible for the LTE transceiver to know what potential channel resource competitors and interference sources are in the unlicensed band, which may result in other WiFi devices not being able to acquire channel resources, and the LTE transceiver will also be affected.
  • the relatively large interference of other WiFi devices in the unlicensed band leads to a decrease in system synchronization performance, channel estimation performance, and modulation and demodulation performance.
  • Embodiments of the present invention provide a method and apparatus for communicating on an unlicensed frequency band.
  • the technical solution is as follows:
  • a method for communicating on an unlicensed frequency band comprising: reserving a channel resource of an unlicensed band when determining that an LTE frame needs to be sent to a second device
  • the source broadcasts control signaling for indicating a WLAN format for reserving the channel resource, where the control signaling is used to notify the third device in the WLAN system that the channel resource is occupied, so that the third device stops. Competing for the competition of the channel resources; controlling the first device to be in the LTE system; and when the first device is in the LTE system, sending an LTE frame to the second device on the channel resource of the reserved unlicensed band .
  • the method further includes: starting a predetermined timer, where The timing duration of the timer is a predetermined duration greater than 0.
  • the step of transmitting the LTE frame to the second device on the reserved channel resource of the reserved unlicensed band is performed.
  • the NDP data packet is transmitted in a manner understandable by the second device (that is, the user to be received), and the user to be received can use the NDP data to perform preliminary clock synchronization, frequency synchronization, etc., and utilize these preliminary clocks. Synchronous frequency synchronization information, the user to be received can further enhance the clock synchronization accuracy and frequency synchronization accuracy of the LTE frame receiving phase.
  • the first number of devices in the LTE system and the device in the WLAN system are obtained for the channel that competes for the unlicensed band
  • the second quantity is set according to the first quantity and the second quantity, wherein the ratio of the local LTE time slice and the WLAN time slice is set, wherein, in the WLAN time slice, the first device is in the WLAN mode
  • the first device is in the LTE system in the LTE time slice.
  • the number of devices in the WLAN system is obtained; When the number is greater than the first quantity threshold, reduce the proportion of the LTE time slice, or use other channel resources to perform transmission of the LTE frame; when the quantity is less than the second quantity threshold, increase the proportion of the LTE time slice, where In the LTE time slice, the first device is in the LTE system.
  • the local LTE time slice and the WLAN time slice are adjusted in real time according to the number of devices in the WLAN system in the unlicensed band, so that the first device can set the LTE transceiver policy more reasonably.
  • the obtaining the number of devices in the WLAN system includes: the first device is a base station device, Measure the channel of the unlicensed band to obtain the number of devices in the WLAN system; the first device is a non-base station device, and detects a channel of the unlicensed band, and sends the detection result to the base station device, where The base station device counts the number of devices in the WLAN system according to the detection result of each first device, broadcasts the counted number, and receives the number of devices in the WLAN system broadcast by the base station device.
  • control signaling is further And configured to notify the second device to perform clock synchronization and frequency synchronization with the first device.
  • the first device includes One or both of the LTE transceiver and the WLAN transceiver, when the LTE transceiver is activated, the first device is in the LTE system, and the first device in the LTE system is allowed to use the The LTE transceiver transmits and receives an LTE frame; when the WLAN transceiver is activated, the first device is in a WLAN system, and the first device in the WLAN system is allowed to use the WLAN transceiver to send and receive WLAN data packets.
  • the LTE transceiver and The WLAN transceiver shares a set of radio frequency RF and transceiver antennas, and the first device allows only one of the LTE transceiver and the WLAN transceiver to be activated during the same time period;
  • the LTE transceiver uses the first set of radio frequency ( English: Radio Frequency (RF) and transceiver antenna
  • the WLAN transceiver uses a second set of RF and transceiver antennas
  • the first device allows activation of the LTE transceiver and the WLAN transceiver at the same time period, and works in the same time period.
  • the operating frequency of the LTE transceiver is different from the operating frequency of the WLAN transceiver.
  • the second aspect provides an apparatus for communicating on an unlicensed frequency band, which is applied to a first device, where the apparatus includes: a sending unit, configured to reserve a licensed spectrum when determining that an LTE frame needs to be sent to the second device a channel resource, which is used to indicate control signaling of a WLAN format for reserving the channel resource, where the control signaling is used to notify the third device in the WLAN system that the channel resource is occupied, so that the third device is used. Stop participating in the competition of the channel resources;
  • control unit configured to control the first device to be in an LTE system
  • the sending unit is further configured to: when the control unit controls the first device to be in the LTE system, send an LTE frame to the second device on the channel resource of the reserved unlicensed band.
  • control unit is further configured to start a predetermined timer, where a timing duration of the timer is a predetermined duration greater than 0, and the sending unit is further configured to: When the timer timing initiated by the control unit ends, an LTE frame is sent to the second device on the channel resource of the reserved unlicensed band.
  • control unit is further configured to acquire a device in an LTE system that competes for a channel of the unlicensed band a quantity and a second quantity of devices in the WLAN system;
  • the control unit is further configured to set a ratio of a local LTE time slice to a WLAN time slice according to the obtained first quantity and the second quantity,
  • the first device is in the WLAN mode, and the first device is in the LTE system in the LTE time slice.
  • control unit is further configured to acquire a WLAN standard The number of devices under;
  • the control unit is further configured to: when the acquired quantity is greater than the first quantity threshold, reduce the proportion of the LTE time slice, or use other channel resources to perform the LTE frame transmission;
  • the control unit is further configured to: when the acquired quantity is less than the second quantity threshold, increase the proportion of the LTE time slice,
  • the first device is in the LTE system in the LTE time slice.
  • control unit is further configured to:
  • the first device is a base station device
  • the channel of the unlicensed band is measured, and the number of devices in the WLAN system is obtained;
  • the first device is a non-base station device
  • the channel of the unlicensed band is detected, and the detection result is sent to the base station device, where the base station device calculates the WLAN system according to the detection result of each first device.
  • the number of devices is broadcasted by the counted number; the number of devices in the WLAN system broadcasted by the base station device is received.
  • control signaling is further And configured to notify the second device to perform clock synchronization and frequency synchronization with the first device.
  • the first device includes The first or both of the LTE transceiver and the WLAN transceiver,
  • the first device When the LTE transceiver is activated, the first device is in the LTE system, and the first device in the LTE system is allowed to use the LTE transceiver to send and receive LTE frames;
  • the first device When the WLAN transceiver is activated, the first device is in a WLAN system, and the first device in the WLAN system is allowed to use the WLAN transceiver to send and receive WLAN data packets.
  • the LTE transceiver and The WLAN transceiver shares a set of RF and transceiver antennas, and the first device allows only one of the LTE transceiver and the WLAN transceiver to be activated during the same period;
  • the LTE transceiver uses a first set of RF and transceiver antennas
  • the WLAN transceiver uses a second set of RF and transceiver antennas
  • the first device allows activation of the LTE transceiver and WLAN transceiver during the same time period, during the same period
  • the operating frequency of the LTE transceiver operating is different from the operating frequency of the WLAN transceiver.
  • a first device for communicating over an unlicensed frequency band comprising: a WLAN transceiver, a controller, and an LTE transceiver,
  • the WLAN transceiver is configured to: when determining that an LTE frame needs to be sent to the second device, reserve a channel resource of the licensed spectrum, and broadcast control signaling for indicating a WLAN format for reserving the channel resource, where the control signal is The channel resource used to notify the third device in the WLAN system that the channel resource is occupied, so that the third device stops participating in the competition of the channel resource;
  • the controller is configured to control the first device to be in an LTE system
  • the LTE transceiver is further configured to: when the controller controls the first device to be in the LTE system, send an LTE frame to the second device on the channel resource of the reserved unlicensed band.
  • the first device further includes a processor
  • the processor is configured to start a predetermined timer, where a timing duration of the timer is a predetermined duration greater than 0;
  • the LTE transceiver is further configured to send an LTE frame to the second device on the channel resource of the reserved unlicensed band when the timer timing initiated by the processor ends.
  • the processor is further configured to obtain a channel that competes for an unlicensed band in an LTE system.
  • the processor is further configured to set a ratio of a local LTE time slice to a WLAN time slice according to the obtained first quantity and the second quantity,
  • the first device is in the WLAN mode, and the first device is in the LTE system in the LTE time slice.
  • the first device further includes:
  • the processor is further configured to acquire the number of devices in the WLAN system
  • the processor is further configured to: when the acquired quantity is greater than the first quantity threshold, reduce a proportion of an LTE time slice, or use another channel resource to perform LTE frame transmission;
  • the processor is further configured to: when the acquired quantity is less than the second quantity threshold, increase the proportion of the LTE time slice,
  • the first device is in the LTE system in the LTE time slice.
  • the processor is further configured to: when the first device is a base station device, measure a channel of the unlicensed band to obtain a quantity of devices in the WLAN system;
  • the processor is further configured to: when the first device is a non-base station device, detect a channel of the unlicensed band, and send the detection result to the base station device, where the base station device detects the detection result according to each first device.
  • the number of devices in the WLAN system is counted, and the counted number is broadcasted.
  • the WLAN transceiver is further configured to receive the number of devices in the WLAN system broadcast by the base station device.
  • control signaling is further And configured to notify the second device to perform clock synchronization and frequency synchronization with the first device.
  • the first possible implementation manner of the third aspect or any one of the fifth possible implementation manner of the third aspect, in the sixth possible implementation manner, when the LTE transceiver When the first device is in the LTE system, the first device in the LTE system is allowed to use the LTE transceiver to send and receive LTE frames.
  • the first device When the WLAN transceiver is activated, the first device is in a WLAN system, and the first device in the WLAN system is allowed to use the WLAN transceiver to send and receive WLAN data packets.
  • the LTE transceiver and The WLAN transceiver shares a set of RF and transceiver antennas, and the first device allows only one of the LTE transceiver and the WLAN transceiver to be activated during the same period;
  • the LTE transceiver uses a first set of RF and transceiver antennas
  • the WLAN transceiver uses a second set of RF and transceiver antennas
  • the first device allows activation of the LTE transceiver and WLAN transceiver during the same time period, during the same period
  • the operating frequency of the LTE transceiver operating is different from the operating frequency of the WLAN transceiver.
  • FIG. 1 is a schematic diagram of a network structure according to some embodiments of the present invention.
  • FIG. 2A is a schematic structural diagram of a SAiL to be transmitted user provided in an embodiment of the present invention.
  • 2B is a schematic structural diagram of a SAiL to be transmitted user according to another embodiment of the present invention.
  • 3A is a flow chart of a method of communicating over an unlicensed frequency band provided in an embodiment of the present invention.
  • 3B is a schematic diagram of a WLAN empty data packet provided in an implementation of the present invention.
  • 3C is a schematic diagram of a SAiL device and other WLAN users provided in an implementation of the present invention when communicating on an unlicensed frequency band;
  • FIG. 3D is a flowchart of a process of setting an LTE time slice and a WLAN time slice according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of an apparatus for communicating on an unlicensed frequency band according to an embodiment of the present invention.
  • the LTE system has so far mainly worked in a licensed (English: licensed) spectrum. Usually, the operator first obtains the charged wireless spectrum, and then provides a charging service in a certain coverage area by installing a device such as a wireless base station. Since the spectrum itself is paid for by the operator, the operator can and needs to strictly control this spectrum resource.
  • the LTE system is a communication system that basically adopts centralized control, and the eNB has great power, and the UE basically completely obeys the instructions of the eNB, including when and in what resource block to send data, when and what. The resource block receives data and so on.
  • IEEE 802.11 wireless LANs mostly work in unlicensed spectrum, such as the 2.4 GHz spectrum or the 5 GHz spectrum. Since the spectrum itself does not require cost, in most cases the operator's intervention is not required. Users (individuals or merchants) only need to install a router device access point (English: access point, AP) to provide free or paid services within a certain range. Since the spectrum itself is freely available to the user, the user is basically not in a very strict need to strictly control the spectrum resources.
  • the WLAN/WiFi system is a communication system that basically adopts distributed control.
  • the AP provides a part of network management functions (such as network access, authentication, etc.), most of the time, APs and sites (English: Station, STA) is in a more equal role.
  • STA Service
  • the STA sends and receives is basically determined by the STA itself, without obeying the AP's command.
  • the AP also needs to comply with the channel access rules consistent with the STA, such as Carrier Sense Multiple Access/Collision Derect (CSMA/CD).
  • CSMA/CD Carrier Sense Multiple Access/Collision Derect
  • An extreme example is that even if an AP sends a beacon frame (used to broadcast important system information, similar to the Broadcast Channel (BCH) channel in LTE), it also needs to comply with channel access rules such as CSMA/CA. .
  • the uplink channel and the downlink channel of the LTE system can be at the same frequency point, and can be divided into two modes (Time-Division Duplex (TDD)). It can also be at different frequency points, that is, frequency division duplex (English: Frequency Division Duplex) , FDD). In the traditional cellular mobile communication system, the FDD system is widely used.
  • TDD Time-Division Duplex
  • FDD Frequency Division Duplex
  • IEEE 802.11 wireless LAN mainly adopts TDD standard.
  • IEEE 802.11 the link from the AP to the STA is referred to as the downlink, and the link of the STA to the AP is the uplink.
  • the UE wants to receive data, and needs to first receive the downlink channel assignment sent by the eNB (English: downlink channel assignment).
  • the downlink channel allocation is generally sent through the Physical Downlink Control Channel (PDCCH) to inform the UE at what time, in which frequency band or resource block to receive downlink data, and to inform the UE of the format in which the data is sent, such as a codeword.
  • Number closed loop (English: closed loop) Multiple-Input Multiple-Output (MIMO), Open loop MIMO, Dual layer beamforming, English User MIMO and more.
  • MIMO Multiple-Input Multiple-Output
  • the UE demodulates the data in a specified format to the specified resource block at a specified time.
  • the UE provides a certain degree of feedback information, such as channel feedback, channel quality indicator (CQI) feedback, etc., to report the basic situation of the current channel.
  • the final scheduling decision is determined by the eNB in its sole discretion, that is, the eNB may determine the downlink channel allocation according to the feedback of the UE, or may override the feedback of the UE to determine the downlink channel allocation.
  • the user shall comply with the downlink channel assignment of the eNB.
  • the UE wants to transmit data, it needs to receive the uplink grant (English: uplink grants).
  • the uplink grants are generally sent through the downlink channel assignment PDCCH to inform the UE at what time, in what frequency band or resource block to send uplink data.
  • the user must comply with the uplink grants of the eNB. It is not possible to choose when and how to select the frequency band to send data.
  • IEEE 802.11 WLAN uses a distributed scheduling function (DCF).
  • DCF distributed scheduling function
  • each transmitter the STA in the uplink or the AP in the downlink
  • the transmission band is the entire system band. Therefore, the transmitter does not need to select a frequency band or resource block to transmit signals directly over the entire system frequency band.
  • the receiver can provide a certain degree of channel feedback, such as channel state information feedback (English: channel state information feedback) or signal to noise ratio feedback (English: SNR feedback) (similar to CQI feedback in LTE systems).
  • channel state information feedback English: channel state information feedback
  • SNR feedback signal to noise ratio feedback
  • the transmitter can determine the transmit signal power, modulation and demodulation scheme, etc. according to its own algorithm. Due to each transmitter The transmission time is determined by itself, and it is not known whether the other transmitters will perform the transmission operation at the same time, so channel collision and interference must occur. In view of this, IEEE 802.11 uses carrier avoidance based carrier sensing technology to solve and mitigate interference problems.
  • the LTE transmission scheme is designed for the unlicensed frequency band, when the legacy LTE technology is transplanted to the unlicensed frequency band, in the unlicensed frequency band, if the eNB directly transmits various signals to the UE, the UE directly transmits various signals.
  • the eNB is not required to perform idle channel estimation before transmission. This makes the LTE transceiver unable to know what potential channel resource competitors and interference sources are in the unlicensed band, resulting in other WiFi users being basically unable or very It is difficult to obtain channel resources, and the LTE transceiver is also subject to relatively large interference from other WiFi users in the unlicensed band, resulting in system synchronization performance, channel estimation performance, and modulation and demodulation performance all falling.
  • the present application proposes a method for using the LTE system to communicate on the unlicensed frequency band, so that the LTE device notifies the WLAN user to stop competing for the resources occupied by the LTE device when using the resource communication of the unlicensed band, and tries to avoid the WLAN user. Impact.
  • the network structure includes a base station 110, a user equipment 120, an access point 130, and a station 140.
  • the base station 110 and the user equipment 120 need to set the WLAN transceiver in addition to the LTE transceiver.
  • base station 110 user equipment 120, access point 130, and station 140 can all use the unlicensed band.
  • the base station and the user equipment that can work in the unlicensed frequency band are called LTE (Standard-Alone Unlicensed LTE, SAiL) devices, and the SAiL device that transmits the LTE frame is the SAiL to be transmitted, correspondingly, receiving The SAiL device of the LTE frame is a SAiL to be received user.
  • LTE Standard-Alone Unlicensed LTE, SAiL
  • the SAiL user to be transmitted is taken as an example.
  • the SAiL to be transmitted user includes an LTE transceiver 21a, a WLAN transceiver 22a, a controller 23a, and a set of radio frequency and transceiver antennas 24a.
  • the controller 23a is connected to the LTE transceiver 21a and the WLAN transceiver 22a, respectively, and the LTE transceiver 21a and the WLAN transceiver 22a are connected to a set of radio frequency and transceiver antennas 24a.
  • the controller 23a can control one of the LTE transceiver 21a and the WLAN transceiver 22a to be activated.
  • the LTE transceiver 21a When the controller 23a activates the LTE transceiver 21a, the LTE transceiver 21a can use the radio frequency and the transceiver antenna 24a to transmit the LTE frame; WLAN 23a when WLAN transceiver 22a is activated
  • the transceiver 220 can transmit WLAN data packets using the radio frequency and the transceiver antenna 24a.
  • the SAiL to be transmitted user shown in FIG. 2B includes two sets of radio frequency and transceiver antennas, including the first set of radio frequency and transceiver, in addition to the LTE transceiver 21b, the WLAN transceiver 22b, and the controller 23b.
  • the controller 23b is connected to the LTE transceiver 21b and the WLAN transceiver 22b, respectively, and the LTE transceiver 21b is electrically connected to the first set of radio frequency and transceiver antennas 24b1, and the WLAN transceiver 22b is electrically connected to the second set of radio frequency and transceiver antennas 24b2.
  • the controller 23b can control at least one of the LTE transceiver 21b and the WLAN transceiver 22b to be activated.
  • the controller 23b simultaneously activates the LTE transceiver 21b and the WLAN transceiver 22b in the same period, the LTE transceiver 21b can utilize the A set of radio frequency and transceiver antennas 24b1 operate at different frequencies, and the WLAN transceiver 22b can operate on different frequencies using the second set of radio frequency and transceiver antennas 24b2, and can both operate with unlicensed bands.
  • FIG. 3A is a flowchart of a method for communicating on an unlicensed frequency band by using an LTE system according to an embodiment of the present invention.
  • the method may be applied to the first device shown in FIG. 2A or FIG. 2B, where the first device may be The base station 110 or the user equipment 120 shown in FIG. 1 , that is, the first device may be a SAiL to be transmitted user.
  • the method includes the following steps:
  • step 301 when it is determined that the LTE frame needs to be sent to the second device, the channel resource of the unlicensed band is reserved, and the control signaling for indicating the reserved channel resource in the WLAN format is broadcasted, and the control signaling is used to notify the WLAN.
  • the third device channel resource under the system is occupied, so that the third device stops participating in the competition of the channel resources.
  • the second device here is a device that receives an LTE frame, and the second device may be referred to as a SAiL to be received user.
  • the channel resource in the unlicensed band may be selected to be used, so that other WLAN devices (access points and stations) may know the unlicensed band used by the first device.
  • the channel resource the first device first needs to reserve the channel resource of the unlicensed band, that is, subsequently use the reserved channel resource to send the LTE frame to the second device, and then broadcast the control signaling for indicating the reserved channel resource.
  • the third device stops participating in the competition of the channel resources.
  • the first device reserves the channel resources of the unlicensed band, it can pass the idle channel evaluation and other mechanisms. to realise.
  • control signaling is usually for informing the third device in the WLAN system
  • the control signaling is usually the control signaling in the WLAN format.
  • the control signaling may be a WLAN null packet (Null Data Packet, NDP packet), that is, only a WLAN packet header (English: WLAN packet header), and no data payload (English) :data payload).
  • the structure of the WLAN empty data packet can be seen in FIG. 3B.
  • the meanings of the various fields are as follows:
  • L-STF Traditional Short Training Field
  • L-LTF Long Training Field
  • L-SIG Traditional Signaling Field
  • High Throughput Signaling Field Contains new signaling information, and can also be used in HT mixed format (English: HT Mixed Format) and traditional Orthogonal Frequency Division Multiplexing (English: Orthogonal Frequency-Division) Multiplexing, OFDM) automatic detection between packets;
  • High throughput short training field (HT-STF): used to reset the AGC in the case of high throughput;
  • High Throughput Long Training Field Used for multi-input and multi-out channel estimation.
  • NDP can be mainly used for channel sounding of a WiFi transceiver (English: channel sounding).
  • NDP does not exist or has not been defined.
  • the present application innovatively uses NDP in an application that utilizes an unlicensed band to transmit LTE frames, such that other WLAN devices can cease contention for reserved channel resources.
  • the control signaling can not only notify the third device that the channel resource in the WLAN system is occupied, but also make the second device know that the first device will perform LTE transmission, and then the clock synchronization and the frequency synchronization with the first device can be performed. So that the subsequent second device receives the LTE frame sent by the first device.
  • the channel in the LTE system and the channel in the WLAN system are basically the same between the same pair of transceiver devices. Therefore, after the second device enters the LTE system, the WLAN synchronization information and channel information obtained in the WLAN system can be utilized. Helps acquire LTE synchronization information and channel information in LTE mode. Since the additional channel estimation in the WLAN mode is synchronized with the extra time frequency, the channel estimation accuracy and the time-frequency synchronization accuracy in the LTE are improved.
  • the first device may select one bit in the HT-SIG1 or HT-SIG2 (or VHT-SIG) part of the null data packet, which may be an undefined reserved bit, or may be one already A bit that is defined but not used (requires redefinition), other WLAN users ignore this bit and always consider this to be a null packet and therefore operate normally (ie, continue to wait for the channel to be idle or go to sleep).
  • the second device is initially in the WLAN receiving state (that is, in the WLAN system). If the bit is received, the second device knows that the first device subsequently sends an LTE frame, and then switches to the LTE receiving state, and then continues. LTE receiving; if the bit is received as 0, the second device knows that the first device does not have an LTE frame, and then stays in the WLAN receiving state to receive.
  • Step 302 Start a predetermined timer, and the timing duration of the timer is a predetermined duration greater than 0.
  • the embodiment may start a predetermined timer after the first device broadcasts the control signaling.
  • the timing duration of the timer is a predetermined duration greater than 0. The value of the predetermined duration generally ensures that the first device has sufficient time to switch from the WLAN system to the LTE system.
  • the timing duration is a fixed value, which helps the second device to accurately grasp the synchronization information with the first device. That is, after receiving the control signaling, the second device may estimate that the first device sends the LTE frame after the predetermined time period, so the second device receives the LTE frame sent by the first device in the reserved channel resource at the estimated time. .
  • the timing duration is not too long (generally smaller than Short Inter Frame Spacing) to ensure that other WLAN users do not preemptively acquire channel resources, and maintain time-lapse of NDP time frequency synchronization and channel estimation.
  • the shorter the time The more the channel estimation information and the time frequency synchronization information obtained by the WLAN state are helpful for the subsequent LTE state.
  • Step 303 controlling the first device to be in the LTE system.
  • the controller of the first device may activate the LTE transceiver to place the first device in the LTE system. This process can be processed during the timer timing process.
  • the LTE transceiver of the first device can transmit only when the channel resource is successfully reserved through the WLAN system. If no reservation is successful, it indicates that the channel resource may be preempted by other SAil devices. In this case, the first device cannot use the channel resource to transmit LTE frames.
  • Step 304 At the end of the timer timing, send an LTE frame to the second device on the channel resource of the reserved unlicensed band.
  • the working state between the first device, the second device, and the third device may be referred to the schematic diagram shown in FIG. 3C.
  • the SAiL to be transmitted user (such as the first device or the SAiL eNB) first monitors the channel state in the WLAN receiving state, broadcasts the NDP at time t1, passes the predetermined time period T0, and transmits at time t2.
  • the LTE frame is transmitted;
  • the SAiL to be received user (such as the second device or the SAiL UE) receives the NDP and prepares for subsequent reception, starts receiving the LTE frame at time t2;
  • WLAN STA1 such as a third device
  • WLAN STA2 such as another The third device performs WLAN transmission in the period before t1, receives the NDP at time t1, and goes to the sleep state.
  • the first device After the first device completes the LTE frame transmission, it is generally required to re-enter the WLAN receiving state or the channel listening state.
  • the first device when the first device enters the WLAN receiving state, it may receive control signaling sent by other devices, and stop competing for channel resources indicated by the control signaling that have been reserved.
  • the steps 301 to 304 may be continued when the channel is idle and the LTE frame needs to be sent.
  • the method provided by the embodiment of the present invention informs other WLAN receivers that the unlicensed frequency band will be occupied before the LTE transmission can be understood by other WLAN receivers, so that the WLAN receivers will no longer participate.
  • Channel competition so the interference experienced by subsequent LTE transmission will become smaller.
  • the NDP data packet is transmitted in a manner understandable by the second device (that is, the user to be received), and the user to be received can use the NDP data to perform preliminary clock synchronization, frequency synchronization, etc., and utilize these preliminary clocks. Synchronous frequency synchronization information, the user to be received can further enhance the clock synchronization accuracy and frequency synchronization accuracy of the LTE frame receiving phase.
  • the receiver Prior to LTE transmission, the receiver can understand that the unlicensed bands behind other WLAN receivers will be occupied in a manner understandable by other WLAN users, so that these WLAN receivers can enter a sleep state to save power or energy.
  • LTE time slices and WLAN time slices may be periodically repeated, or may be non-periodically repeated.
  • the LTE time slice and the WLAN time slice should be related to the current cell interference situation and the number of WiFi users.
  • time slice epoch 7 time slice epochs can be allocated for the LTE system, and the remaining 3 time slice epochs are used for the WLAN system.
  • the time slice epoch is defined as a fixed time slice, and the specific value is to be determined. It is foreseeable that when there are many other WiFi users in the unlicensed spectrum, the time slice length of LTE should be reduced accordingly, so that many WiFi users have more opportunities to obtain channel resources. Conversely, when the number of other WiFi users in the unlicensed band is small, the time slice length of LTE can be increased accordingly. Therefore, in this embodiment, a time slice of WLAN/LTE or a mode of WLAN/LTE cycle control is adaptively adjusted.
  • the LTE time slice and the WLAN time slice of the first device can be adjusted according to the occupancy rate of the unlicensed band to improve data transmission efficiency.
  • the ratio of the LTE time slice and the WLAN time slice may be initialized according to a preset ratio, or may be based on the LTE system and the WLAN system in the unlicensed band according to the unlicensed band. The number of devices under which to initialize the ratio of LTE time slices to WLAN time slices.
  • FIG. 3D is a flowchart of a process of setting an LTE time slice and a WLAN time slice according to an embodiment of the present invention, where the method includes the following steps:
  • Step 305 Acquire a first number of devices in the LTE system and a second number of devices in the WLAN system that compete for the channel of the unlicensed band.
  • the first device can measure the channel of the unlicensed band. This can be done by using the measurement (English: measurement) mechanism provided by IEEE 802.11k.
  • a series of measurements and reports are defined in IEEE 802.11k (English: measurement and reports) for assisting cell balancing (English: load balancing), admission control (English: admission control), rogue AP detection (English: rogue AP) Detection), coverage and frequency planning (English: coverage and frequency planning), power control (English: transmit power control), interference estimation (English: interference estimation), mobile AP selection (English: roaming AP selection), mobile switching (English) :roaming handoff), positioning and others (English: localization and others).
  • beacon broadcast information report (English: Beacon report
  • frame information report (English: Frame report)
  • channel load report (English: Channel load report)
  • noise distribution map report (English: Noise) Histogram report
  • Hidden node report (English: Station statistics report)
  • Medium sensing time histogram report (English: Medium sensing time histogram report).
  • the channel of the unlicensed band can be directly measured to obtain a measurement result, or the measurement results of each user equipment can be aggregated to obtain a final measurement result.
  • the channel of the unlicensed band can be directly measured to obtain a measurement result.
  • Step 306 Set a ratio of a local LTE time slice to a WLAN time slice according to the first quantity and the second quantity.
  • the first device In the WLAN time slice, the first device is in the WLAN system, and in the LTE time slice, the first device is in the LTE system.
  • the ratio of the first quantity to the second quantity is recorded as a first ratio, and the ratio of the set LTE time slice and the WLAN time slice is recorded as the second ratio, and the first ratio and the second ratio may be positive correlation, that is, the first The larger the ratio, the larger the second ratio obtained.
  • Step 307 Obtain the number of devices in the WLAN system.
  • the first device is a base station device, and measures the channel of the unlicensed band to obtain the number of devices in the WLAN system.
  • the first device is a non-base station device, and the channel of the unlicensed band is detected, and the detection result is sent to the base station device, and the number of devices in the WLAN system is counted by the base station device according to the detection result of each first device.
  • the number of statistics is broadcasted, and the number of devices in the WLAN system broadcasted by the base station device is received.
  • Step 308 when the quantity is greater than the first quantity threshold, reduce the proportion of the LTE time slice, or use other channel resources to perform the transmission of the LTE frame.
  • the controller in the first device can reduce the working time of the LTE transceiver, and correspondingly, improve the working time of the WLAN transceiver.
  • Step 309 when the quantity is less than the second quantity threshold, increase the proportion of the LTE time slice.
  • the controller in the first device can improve the working time of the LTE transceiver, and correspondingly, improve the working time of the WLAN transceiver.
  • the first device is a SAiL base station, that is, the SAiL base station determines the ratio of the WLAN time slice to the LTE time slice, it can be broadcast to other SAiL UEs in the local cell.
  • the other SAiL UEs receive the ratio of the WLAN time slice and the LTE time slice broadcast by the SAiL base station, and can be used as a reference to adjust the ratio of the local WLAN time slice to the LTE time slice, and can also ignore the received WLAN time slice and LTE time. The proportion of the piece.
  • the method provided by the embodiment of the present invention automatically determines the measurement result based on the channel measurement. If the ratio of the local WLAN time slice to the LTE time slice is adjusted, the transmission efficiency can be improved as much as possible.
  • the embodiment shown in FIG. 3D can be combined with the embodiment shown in FIG. 3A to dynamically adjust the ratio of the WLAN time slice to the LTE time slice in the SAiL device.
  • the SAiL device follows the WLAN time slice and the LTE time slice.
  • the ratio controls the system in which the SAiL device is located and the duration of the system in which it is placed.
  • the apparatus includes a transmitting unit 410 and a processing unit 420.
  • the sending unit 410 is configured to perform the functions of at least one of step 301 and step 304;
  • the processing unit 420 is configured to perform the functions of at least one of step 302, step 303, and step 305 to step 309.
  • the sending unit 410 can be implemented by the WLAN transceiver and the LTE transceiver shown in FIG. 2A and FIG. 2B
  • the processing unit 420 can be implemented by the controller shown in FIG. 2A and FIG. 2B.
  • the LTE system provides communication on the unlicensed frequency band in the unlicensed frequency band by using the LTE system
  • only the division of the foregoing functional modules is illustrated. In practical applications, the foregoing may be performed as needed.
  • the function assignment is performed by different functional modules, that is, the internal structure of the SAiL device is divided into different functional modules to complete all or part of the functions described above.
  • the embodiment of the present invention provides a method for the communication between the communication device and the LTE system on the unlicensed frequency band by using the LTE system. The specific implementation process is described in detail in the method embodiment, and details are not described herein again.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

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

Abstract

Des modes de réalisation de l'invention concernent un procédé et un dispositif de communication d'un système LTE sur une bande de fréquences sans licence, qui se rapportent au domaine des technologies de réseau. Le procédé comprend les étapes suivantes : réserver une ressource de canal d'une bande de fréquences sans licence lorsqu'il est déterminé qu'une trame LTE doit être envoyée à un deuxième dispositif, et diffuser une signalisation de commande de format WLAN pour réserver la ressource de canal, la signalisation de commande étant utilisée pour informer un troisième dispositif dans une norme WLAN que la ressource de canal est occupée, de sorte que le troisième dispositif arrête la contention pour la ressource de canal ; commander un premier dispositif pour qu'il soit dans une norme LTE ; et envoyer la trame LTE au deuxième dispositif sur la ressource de canal réservée de la bande de fréquences sans licence. Selon l'invention, avant la transmission LTE, d'autres récepteurs WLAN sont informés qu'une bande de fréquences sans licence suivante sera occupée, de sorte que lesdits récepteurs WLAN ne soient pas impliqués dans la contention de canal. Par conséquent, la transmission LTE suivante subira moins d'interférences.
PCT/CN2016/092431 2016-07-29 2016-07-29 Procédé et dispositif de communication sur bande de fréquences sans licence WO2018018638A1 (fr)

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