WO2019237832A1 - 一种请求信号的发送、接收方法及设备、装置 - Google Patents

一种请求信号的发送、接收方法及设备、装置 Download PDF

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Publication number
WO2019237832A1
WO2019237832A1 PCT/CN2019/083738 CN2019083738W WO2019237832A1 WO 2019237832 A1 WO2019237832 A1 WO 2019237832A1 CN 2019083738 W CN2019083738 W CN 2019083738W WO 2019237832 A1 WO2019237832 A1 WO 2019237832A1
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Prior art keywords
channel
signal
request signal
information
specific sequence
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English (en)
French (fr)
Inventor
王加庆
郑方政
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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Priority to EP19819852.5A priority Critical patent/EP3806371B1/en
Priority to US17/251,542 priority patent/US11665738B2/en
Publication of WO2019237832A1 publication Critical patent/WO2019237832A1/zh
Anticipated expiration legal-status Critical
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • H04W74/0808Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/0006Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signalling, i.e. of overhead other than pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/12Wireless traffic scheduling
    • H04W72/1263Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method, a device, and a device for sending and receiving a request signal.
  • the unlicensed spectrum has no specific application system planned and can be shared by multiple wireless communication systems.
  • the existing unlicensed frequency spectrum (unlicensed spectrum) existing communication systems mainly include IEEE standardized Bluetooth, WiFi and 3GPP unlicensed frequency bands.
  • Evolution (Long-Term Evolution Evolution Spectrum) (LTE-U) systems use shared unlicensed spectrum resources among multiple systems by preempting resources.
  • LBT Listen Before Talk
  • Cat.3 Random fallback LBT with fixed contention window size (LBT with random back-off with fixed size of contention window);
  • Cat.4 Random backoff LBT with variable contention window size (LBT with random back-off with variable size of contention window).
  • LBT cat.2 LBT cat.4 defined by 3GPP.
  • Unlicensed frequency bands generally have shorter transmission distances. Perhaps the coverage radius is no longer the main reason for beam transmission, but the introduction of beam transmission brings new variables to the LBT mechanism.
  • NR-U new wireless access technology
  • directional LBT which is direction-dependent LBT, can be considered. Implementation of direction-based LBT will provide more transmission opportunities for NR-U.
  • the disadvantage of the prior art is that in order to avoid the problem of hidden nodes, the RTS / CTS handshake mechanism can be applied to NR-U.
  • the RTS / CTS handshake mechanism can be applied to NR-U.
  • the present invention provides a method, a device, and a device for sending and receiving a request signal, which are used to solve the problem that the channel occupation request signal is not sent or received in the prior art.
  • An embodiment of the present invention provides a method for sending a request signal, including:
  • the base station determines a channel occupancy request signal to be sent, the channel occupancy request signal is a request signal for requesting the terminal to perform channel occupancy after the base station monitors the LBT operation before the conversation in a direction corresponding to at least one beam beam;
  • the base station schedules sending of the channel occupation request signal on a downlink control channel.
  • control information corresponding to the downlink control channel when scheduling on the downlink control channel is scrambled by using the RNTI dedicated to the channel occupation request signal.
  • the exclusive RNTI is associated with a TA ID or a WUS area ID.
  • it further includes:
  • a UE-specific sequence or a Cell-specific sequence is transmitted.
  • the UE-specific sequence is a UE-specific reference signal
  • the UE-specific sequence is part of the WUS signal.
  • the reference signal is a function of a DMRS signal used on a PDCCH corresponding to a channel transmitting a channel occupation request signal.
  • the reference signal is a function of the DMRS signal, which means that the reference signal is consistent with the pattern of the DMRS signal; or the reference signal is a repetition of the DMRS signal in the time-frequency domain; or the reference signal reuses the DMRS signal.
  • it further includes one or a combination of the following processes for UE-specific sequence frequency domain mapping:
  • the frequency-domain transmission resources of the UE-specific sequence are a function of the PDCCH frequency-domain transmission resources corresponding to the UE; or,
  • the UE-specific sequence occupies full bandwidth for transmission; or,
  • the UE-specific sequence is transmitted in an interlace manner.
  • it further includes:
  • a Cell-specific sequence is transmitted.
  • the downlink control channel is a PDCCH
  • the number of PDCCH candidates in the PDCCH search space of the PDCCH transmitting the control information is a fixed value.
  • control information includes one or a combination of the following information:
  • LBT success beam information 1-bit channel occupancy request signal indication information, and information related to the terminal feedback allowed channel occupancy signal.
  • the information related to the terminal feedback allowed channel occupation signal includes one or a combination of the following information:
  • Feedback of frequency domain information of allowed channel occupied signals feedback of time domain information of allowed channel occupied signals, feedback of LBT-related information used by feedback allowed channel occupied signals, interlace information allocated to UE feedback of transmission of allowed channel occupied signals .
  • An embodiment of the present invention provides a method for receiving a request signal, including:
  • the terminal detects a downlink control channel sent by a scheduling channel occupancy request signal, which is a request signal for a channel occupancy request from the base station after monitoring the LBT operation before the conversation in a direction corresponding to at least one beam beam;
  • a scheduling channel occupancy request signal which is a request signal for a channel occupancy request from the base station after monitoring the LBT operation before the conversation in a direction corresponding to at least one beam beam;
  • the terminal receives a channel occupation request signal according to the detection result.
  • control information corresponding to the downlink control channel when scheduling on the downlink control channel is scrambled by using the RNTI dedicated to the channel occupation request signal.
  • the exclusive RNTI is associated with a TA ID or a WUS area ID.
  • it further includes:
  • a UE-specific sequence or a Cell-specific sequence is detected.
  • the UE-specific sequence is a UE-specific reference signal
  • the UE-specific sequence is part of the WUS signal.
  • the reference signal is a function of a DMRS signal used on a PDCCH corresponding to a channel transmitting a channel occupation request signal.
  • the reference signal is a function of the DMRS signal, which means that the reference signal is consistent with the pattern of the DMRS signal; or the reference signal is a repetition of the DMRS signal in the time-frequency domain; or the reference signal reuses the DMRS signal.
  • it further includes one or a combination of the following processes for UE-specific sequence frequency domain mapping:
  • the frequency-domain transmission resources of the UE-specific sequence are a function of the PDCCH frequency-domain transmission resources corresponding to the UE; or,
  • the UE-specific sequence occupies full bandwidth for transmission; or,
  • the UE-specific sequence is transmitted in an interlace manner.
  • it further includes:
  • a Cell-specific sequence is detected.
  • the terminal detects the downlink control channel sent by the scheduling channel occupation request signal according to the static or semi-static configuration search space.
  • the downlink control channel is a PDCCH
  • the number of PDCCH candidates in the PDCCH search space of the detected PDCCH is a fixed value.
  • control information includes one or a combination of the following information:
  • Beam information for LBT success 1-bit channel occupancy request signal indication information, and information related to the terminal feedback allowed channel occupancy signal.
  • the information related to the terminal feedback allowed channel occupation signal includes one or a combination of the following information:
  • Feedback of frequency domain information of allowed channel occupied signals feedback of time domain information of allowed channel occupied signals, feedback of LBT-related information used by feedback allowed channel occupied signals, interlace information allocated to UE feedback of transmission of allowed channel occupied signals .
  • An embodiment of the present invention provides a base station, including:
  • the channel occupancy request signal is a signal requesting the terminal to perform channel occupancy after monitoring the LBT operation before the dialog in a direction corresponding to at least one beam beam;
  • the transceiver is used to receive and send data under the control of the processor, and performs the following processes:
  • the sending of the channel occupation request signal is scheduled on a downlink control channel.
  • control information corresponding to the downlink control channel when scheduling on the downlink control channel is scrambled by using the RNTI dedicated to the channel occupation request signal.
  • the exclusive RNTI is associated with a TA ID or a WUS area ID.
  • it further includes:
  • a UE-specific sequence or a Cell-specific sequence is transmitted.
  • the UE-specific sequence is a UE-specific reference signal
  • the UE-specific sequence is part of the WUS signal.
  • the reference signal is a function of a DMRS signal used on a PDCCH corresponding to a channel transmitting a channel occupation request signal.
  • the reference signal is a function of the DMRS signal, which means that the reference signal is consistent with the pattern of the DMRS signal; or the reference signal is a repetition of the DMRS signal in the time-frequency domain; or the reference signal reuses the DMRS signal.
  • it further includes one or a combination of the following processes for UE-specific sequence frequency domain mapping:
  • the frequency-domain transmission resources of the UE-specific sequence are a function of the PDCCH frequency-domain transmission resources corresponding to the UE; or,
  • the UE-specific sequence occupies full bandwidth for transmission; or,
  • the UE-specific sequence is transmitted in an interlace manner.
  • it further includes:
  • a Cell-specific sequence is transmitted.
  • the downlink control channel is a PDCCH
  • the number of PDCCH candidates in the PDCCH search space of the PDCCH transmitting the control information is a fixed value.
  • control information includes one or a combination of the following information:
  • Beam information for LBT success 1-bit channel occupancy request signal indication information, and information related to the terminal feedback allowed channel occupancy signal.
  • the information related to the terminal feedback allowed channel occupation signal includes one or a combination of the following information:
  • Feedback of frequency domain information of allowed channel occupied signals feedback of time domain information of allowed channel occupied signals, feedback of LBT-related information used by feedback allowed channel occupied signals, interlace information allocated to UE feedback of transmission of allowed channel occupied signals .
  • An embodiment of the present invention provides a user equipment, including:
  • the channel occupancy request signal being a request signal for a channel occupancy request from a terminal after monitoring a LBT operation before a conversation in a direction corresponding to at least one beam beam;
  • the transceiver is used to receive and send data under the control of the processor, and performs the following processes:
  • a channel occupancy request signal is received according to a detection result.
  • control information corresponding to the downlink control channel when scheduling on the downlink control channel is scrambled by using the RNTI dedicated to the channel occupation request signal.
  • the exclusive RNTI is associated with a TA ID or a WUS area ID.
  • it further includes:
  • a UE-specific sequence or a Cell-specific sequence is detected.
  • the UE-specific sequence is a UE-specific reference signal
  • the UE-specific sequence is part of the WUS signal.
  • the reference signal is a function of a DMRS signal used on a PDCCH corresponding to a channel transmitting a channel occupation request signal.
  • the reference signal is a function of the DMRS signal, which means that the reference signal is consistent with the pattern of the DMRS signal; or the reference signal is a repetition of the DMRS signal in the time-frequency domain; or the reference signal reuses the DMRS signal.
  • it further includes one or a combination of the following processes for UE-specific sequence frequency domain mapping:
  • the frequency-domain transmission resources of the UE-specific sequence are a function of the PDCCH frequency-domain transmission resources corresponding to the UE; or,
  • the UE-specific sequence occupies full bandwidth for transmission; or,
  • the UE-specific sequence is transmitted in an interlace manner.
  • it further includes:
  • a Cell-specific sequence is detected.
  • the search space is detected according to the static or semi-static configuration for the downlink control channel sent by the scheduling channel occupation request signal.
  • the downlink control channel is a PDCCH
  • the number of PDCCH candidates in the PDCCH search space of the detected PDCCH is a fixed value.
  • control information includes one or a combination of the following information:
  • Beam information for LBT success 1-bit channel occupancy request signal indication information, and information related to the terminal feedback allowed channel occupancy signal.
  • the information related to the terminal feedback allowed channel occupation signal includes one or a combination of the following information:
  • Feedback of frequency domain information of allowed channel occupied signals feedback of time domain information of allowed channel occupied signals, feedback of LBT-related information used by feedback allowed channel occupied signals, interlace information allocated to UE feedback of transmission of allowed channel occupied signals .
  • An embodiment of the present invention provides a device for sending a request signal, including:
  • a determining module configured to determine a channel occupation request signal to be sent, where the channel occupation request signal is a request signal for requesting a terminal to perform channel occupation after the base station monitors an LBT operation before dialogue in a direction corresponding to at least one beam beam;
  • the sending module is configured to schedule sending of the channel occupation request signal on a downlink control channel.
  • An embodiment of the present invention provides a device for receiving a request signal, including:
  • a detection module is configured to detect a downlink control channel sent by a scheduling channel occupancy request signal, which is a request for a channel occupancy request from a terminal after monitoring a LBT operation before a conversation in a direction corresponding to at least one beam beam. signal;
  • the receiving module is configured to receive a channel occupation request signal according to a detection result.
  • the base station after the base station determines that a channel occupation request signal needs to be sent, the base station sends the channel occupation request signal on a downlink control channel, thereby overcoming a defect that the prior art does not design for the channel occupation request signal. To realize the transmission of the eNB channel occupation request signal.
  • the scheme also provides a scheme that can achieve the lowest power consumption.
  • FIG. 1 is a schematic diagram of a way for WiFi to preempt resources on an unlicensed spectrum according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of beam-based spatial multiplexing in an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a scenario where LAA and NR-U coexist in an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a method for sending a request signal on a base station side according to an embodiment of the present invention
  • FIG. 5 is a schematic flowchart of a method for receiving a request signal on a terminal side
  • FIG. 6 is a schematic diagram of UE-specific RS generation according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a UE according to an embodiment of the present invention.
  • GSM Global System
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access Address
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • UMTS Universal Mobile Telecommunication System
  • NR New Radio
  • the user equipment includes, but is not limited to, a mobile station (MS), a mobile terminal (Mobile), a mobile phone (Mobile), and a mobile phone (handset).
  • MS mobile station
  • Mobile mobile terminal
  • Mobile mobile phone
  • handset mobile phone
  • portable equipment portable equipment
  • the user equipment can communicate with one or more core networks via a Radio Access Network (RAN).
  • RAN Radio Access Network
  • the user equipment can be a mobile phone (or "cellular" Telephone), a computer with wireless communication function, etc.
  • the user equipment may also be a portable, compact, handheld, computer-built or vehicle-mounted mobile device.
  • a base station may refer to a device in an access network that communicates with a wireless terminal through one or more sectors on an air interface.
  • the base station can be used to convert the received air frames and IP packets to each other, and serve as a router between the wireless terminal and the rest of the access network, where the rest of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate the attribute management of the air interface.
  • the base station can be a base station (Base Transceiver Station, BTS) in GSM or CDMA, or a base station (NodeB) in TD-SCDMA or WCDMA, or an evolved base station (eNodeB or eNB or e- NodeB, evolutional (NodeB), or base station (gNB) in 5G NR, the present invention is not limited.
  • BTS Base Transceiver Station
  • NodeB base station
  • NodeB base station
  • gNB evolutional
  • the unlicensed spectrum has no specific application system planned and can be shared by multiple wireless communication systems.
  • the existing unlicensed frequency spectrum (unlicensed spectrum) existing communication systems mainly include IEEE standardized Bluetooth, WiFi and 3GPP unlicensed frequency bands.
  • Evolution (Long-Term Evolution Evolution Spectrum) (LTE-U) systems use shared unlicensed spectrum resources among multiple systems by preempting resources.
  • both WiFi and LTE-U use LBT as the basic means for LTE-U competitive access.
  • the 802.11 system uses a channel access mechanism called Carrier Sense / Collision Avoidance / Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA) mechanism.
  • Figure 1 shows how WiFi preempts resources on the unlicensed spectrum. Schematic diagram, the way in which the WiFi system preempts resources on the unlicensed spectrum is shown in Figure 1.
  • DIFS Distributed Inter-Frame Space
  • the current channel is determined to be an idle channel, and then the stations of each channel waiting for access enter a random fallback. Phase to prevent multiple sites from colliding on the same resource.
  • DIFS Distributed Inter-Frame Space
  • Phase Phase to prevent multiple sites from colliding on the same resource.
  • each site cannot occupy spectrum resources for a long time, and when a certain time or data transmission limit is reached, resources need to be released for other WiFi or LTE systems to preempt resources.
  • WiFi In the WiFi system, two access points (Access points, APs) located far away cannot hear each other, and independently transmit data to the STAs at the two sites, but the two STAs are close to each other.
  • WiFi also supports a Request-To-Send / Clear-To-Send protocol (RTS / CTS) handshake mechanism. That is, the AP broadcasts an RTS frame. If the station STA receives the RTS, it will reply with a CTS frame.
  • RTS / CTS handshake mechanism carries the time occupied by the channel during the transmission. In this way, nearby nodes stop accessing the channel after receiving the CTS, thereby avoiding collisions.
  • LBT cat.2 is similar to FBE without using a random backoff mechanism, but uses a fixed CCA time such as 20us; LBT cat.4 is highly similar to the CSMA / CA mechanism of WiFi, and the eNB first performs an energy-based detection (Energy Detection, ED The CCA detection time is configurable. This CCA detection is called Initial CCA (Initial CCA, ICCA).
  • the channel is determined to be free, and the device transmits immediately; otherwise, the current channel is occupied and the device must Next, perform extension CCA (ECCA) detection.
  • ECCA extension CCA
  • the eNB first generates a counter value N which needs to count down according to the size of the contention window q, and finds an idle CCA slot counter value minus 1. When the counter value is 0, Access the channel and initiate the data transmission process.
  • the new radio access technology uses Massive Multiple Input Multiple Output (Massive MIMO) technology, especially in the millimeter wave band
  • Massive MIMO Massive Multiple Input Multiple Output
  • the biggest feature of beam-based transmission is that there are multiple possible transmission beams in the space.
  • the base station and terminal need to determine the best pair of transmitting and receiving beams.
  • the initial access phase is specified in NR.
  • the base station sends synchronization on each beam. Signal grouping (Synchronization Signal Block, SSB).
  • SSB Synchronization Signal Block
  • the terminal determines the best beam to send back to the base station.
  • MAC CE Media Access Control Unit
  • PDCCH physical downlink control channel
  • Unlicensed frequency bands generally have shorter transmission distances. Perhaps the coverage radius is no longer the main reason for beam transmission, but the introduction of beam transmission brings new variables to the LBT mechanism.
  • the aforementioned CSMA / CA mechanism, LBT cat.2, and LBT cat.4 channel access mechanisms used by the aforementioned WiFi and LTE-U actually belong to omnidirectional LBT.
  • the direction-dependent LBT is directional LBT.
  • Implementation of direction-based LBT will provide more transmission opportunities for NR-U.
  • Figure 2 is a schematic diagram of beam-based spatial multiplexing. As shown in Figure 2, it is assumed that gNB A, gNB, and AP are close to each other. If omnidirectional LBT is used, they can hear each other. Only one node can access the channel at the same time. With direction-based LBT, gNB and WiFi will transmit on different beams in the same time without interfering with each other.
  • FIG. 3 is a schematic diagram of the coexistence scenario of LAA and NR-U.
  • LAA authorized carrier assisted access
  • eNB First access the channel to transmit to UE1, the other using the receiving beam of gNB2 based on direction LBT cannot receive the signal sent by gNB1. It is considered that the channel is idle and the channel initiates transmission to UE2, so the signals sent by eNB1 and gNB2 will A collision occurred between UE1 and UE2. If the LAA eNB in FIG. 3 is replaced with an NR-U gNB, the same problem still exists.
  • WiFi proposed an RTS / CTS handshake mechanism.
  • This RTS / CTS handshake mechanism can be applied to NR-U.
  • the base station performs LBT in the beam direction, and then sends a channel occupancy request signal. After the terminal successfully receives the channel occupancy request signal, it feeds back the allowed channel occupancy signal, and the base station successfully receives the allowed channel occupancy. Signal, complete the channel occupation request signal / allow the channel occupation signal to shake hands, start to access the channel, and perform data transmission.
  • how to design and transmit the channel occupancy request signal can be studied in order to minimize power consumption and consumption.
  • Data transmission at the base station side may include:
  • the base station After the base station performs the LBT operation in the direction corresponding to at least one beam, it sends a channel occupation request signal to the terminal to request channel occupation;
  • the base station After receiving the signal allowing the channel to be occupied, the base station performs data transmission on the beam that sends the channel occupation request signal.
  • Signal feedback on the terminal side may include:
  • the terminal receives a channel occupation request signal sent by the base station to the terminal on at least one beam, and the channel occupation request signal is a signal for requesting channel occupation;
  • the terminal After receiving the channel occupancy request signal correctly, the terminal feeds back a signal allowing the channel to be occupied to the base station on the beam that received the signal.
  • the base station first sends channel occupation request signals on multiple beams in sequence. After receiving the channel occupation request signal, the terminal will reply on multiple beams or one beam to allow the channel to be occupied. After the base station successfully decodes the signal that allows the channel to be occupied by the terminal, it sends data.
  • the correct reception indicates that the UE can correctly resolve this signal. If there is no other strong interference at the UE, it means that there are no other transmitting nodes near the UE. Similarly, if the UE can correctly decode the feedback permission signal, only the base station can decode it. Successful, the base station can learn that sometimes the feedback beam is not the same as the receiving beam. Only when the base station decodes the handshake signal correctly can the handshake be successful.
  • the beam that sends the channel occupancy request signal is all or part of the beams that the channel detects as being idle after the base station performs the LBT operation in chronological order in the direction corresponding to at least one beam.
  • the beam that performs the LBT operation is all the possible beams of the space, and / or, the possible beams that are predetermined and configured by the network.
  • the channel occupation request signal contains one or a combination of the following information:
  • Information of the scheduled UEID Beam ID of the beam that transmitted the channel occupation request signal, location information of the beam that transmitted the channel occupation request signal in the space, and channel occupation time information of the beam that transmitted the channel occupation request signal 2.
  • the resource configuration required when the terminal feeds back the allowed channel signal the LBT type information required when the terminal feeds back the allowed channel signal, and pilot information for channel quality measurement.
  • the base station When the base station receives signals that allow the channel to be occupied on multiple beams, it selects the beam with the largest number of users or the beam with the largest transmission capacity for data transmission.
  • the signal allowing the channel to be occupied includes one or a combination of the following information:
  • Information related to channel occupancy time ID information of the beam, terminal identification (UEID) information of the terminal, and channel quality information (CQI) channel quality information based on the beam.
  • UEID terminal identification
  • CQI channel quality information
  • the base station first performs the LBT operation in a chronological order in the directions corresponding to multiple beams.
  • the multiple beams may be all possible beams in space, or may be part of the configured beams that are determined in advance by the network.
  • the case where there is only one beam can be taken as a special case, which is not excluded, and can also be implemented in the same way; the LBT method described may be a directional LBT.
  • the base station sends a beam-based channel occupancy signal request signal on all or part of the beams whose channel detection is idle.
  • the channel occupancy request signal may include:
  • the information may further include the position information of the beam in space, such as the angle of the beam.
  • Pilot information can also be included for channel quality measurements.
  • the terminal After receiving the channel occupation signal request signal based on a beam correctly, the terminal will feedback a signal allowing the channel to be occupied for the beam channel occupation signal request signal, and the signal may occupy an orthogonal frequency division multiplex (Orthogonal Frequency Division Multiplex (OFDM) symbol.
  • OFDM Orthogonal Frequency Division Multiplex
  • the signal can also contain the ID information of the beam, and UEID information, which can include beam-based CQI channel quality information, such as the received signal strength. Estimated (Received Signal Strength, Indication, RSSI) and / or Reference Signal Received Power (RSRP) / Referenced Signal Received Quality (RSRQ) estimates.
  • the beam-based CQI information is very important for the base station to determine whether there are hidden nodes on the beam.
  • the beam-based CQI can be carried in the uplink control information (Uplink Control Information, UCI).
  • UCI Uplink Control Information
  • An example of the frequency may be a demodulation reference signal (DMRS) included in a channel state information reference signal (CSI-RS) or a synchronization signal block (SSB).
  • DMRS demodulation reference signal
  • CSI-RS channel state information reference signal
  • SSB synchronization signal block
  • the base station Before receiving the signal that allows the channel to be occupied, the base station does not know whether it can access the channel, so at least until the base station receives the signal that allows the channel to be occupied, the base station sends a channel occupation request signal on multiple beams passed by the LBT. Of course, it is not excluded that the base station only sends a special case of the channel occupation request signal on an optimal beam;
  • a terminal When a terminal receives a signal, multiple beams can be used to receive a channel occupation request signal, and a signal that allows a channel to be occupied is fed back after successful decoding. After the base station successfully receives the signal allowing the channel to be occupied, it determines that it can access the channel for data transmission.
  • the terminal can feed back signals that allow the channel to be occupied, or can select several beams to feedback the signals that allow the channel to be occupied according to the configuration of the base station.
  • the base station determines the beam of the access channel according to the signals allowed by the user equipment (User Equipment) to allow the channel to be occupied. For example, the beam access channel with the largest number of users or the largest transmission capacity can be selected for data transmission. Of course, in the case of only one beam, there is no need to choose.
  • User Equipment User Equipment
  • the fairness of scheduling can also be considered in specific implementation, based on the handshake success information on each beam or also referring to the user's data scheduling related information, such as the number of times scheduled, the size of the data to be transmitted, and its UE's capabilities, etc. select.
  • the base station when the base station receives signals that allow the channel to be occupied on multiple beams, the base station schedules the channel occupation request signal and the user who successfully handshake the signal that allows the channel to be occupied for data transmission; and / or,
  • the base station When the base station receives signals that allow the channel to be occupied on multiple beams, the base station performs on the beam that has a ratio between the number of users sending signals that allow the channel to be occupied and the number of users receiving channel occupation request signals that is greater than a preset value data transmission.
  • a beam that is dominant in LBT time sequence is selected for data transmission.
  • the base station often wants to schedule multiple terminals at one time, and the base station will send a channel occupation request signal to multiple terminals on the beam of the successful LBT. A subset of. After the base station receives the allowable channel occupation signal, the base station schedules only the uplink or downlink data transmission of the user requesting the occupied signal / allowed occupation signal handshake after accessing the channel. Considering that there are multiple users who allow the channel to occupy the signal, another optional operation method of the base station is to set a threshold. If the number of UEs allowed to occupy the signal received on the beam and the base station sends a request, The proportion of the number of UEs occupying the signal is smaller than the threshold value, and the base station is not allowed to perform channel access on the beam. An example of the threshold value may be set to 20%;
  • the signals that allow the channel to be occupied can be fed back based on the multiple beams, or can be selected based on the configuration of the base station.
  • the base station determines the access channel on the beam according to the signals allowed by the UEs to allow the channel to be occupied.
  • the beam access channel with the largest number of users or the largest transmission capacity can be selected for data transmission.
  • the ratio of the number of allowed occupancy signals received to the requested occupancy signal sent on the beam described below is smaller than the threshold, and the channel is preferentially accessed on the beam that is dominant in LBT time sequence.
  • Example 1 there will be better results under the condition that the transmission and reception beam consistency of the device is guaranteed.
  • the reception beam that performs LBT and the transmission beam are not calibrated, they cannot remain the same. In the case of beam, at this time, it does not make much sense to perform LBT in the direction corresponding to the beam.
  • the behavior of the base station may not perform LBT in the direction corresponding to each beam, but directly in the direction corresponding to the allowed beam.
  • the channel occupancy request signal is transmitted on the network at this time, and other behaviors of the terminal and the base station at this time may be consistent with Example 1.
  • the beam performing the LBT operation is determined based on the prior information of the channel.
  • the prior information is whether the SSB can be transmitted correctly, or the transmission performance information of the beam obtained during the SSB transmission.
  • Example 1 there are multiple beams for which the base station sends a channel occupancy request signal.
  • the base station can perform LBT in the directions corresponding to all possible beams, but this requires relatively high complexity. Therefore, the base station can The information determines the set of beams that can perform LBT.
  • One method of determining is to use the prior information of the channel. For example, the base station can use the beam that can correctly transmit SSB as the beam set that needs to perform LBT.
  • One of the best beams is the beam that will perform LBT.
  • Performing LBT operations includes one or a combination of the following methods:
  • the LBT operation is performed in the direction corresponding to each beam by using the sequential scanning method of the beam scan.
  • the base station After the base station receives a signal allowing the channel to be occupied, it stops performing LBT operations or continues to perform LBT operations.
  • the manner of performing LBT on the direction corresponding to beam can be as follows:
  • the first method is to continuously perform LBT for a direction corresponding to a beam until LBT succeeds;
  • the base station maintains a counter and performs LBT operations in the direction corresponding to a beam until LBT succeeds;
  • the base station maintains a counter and will perform LBT in a beam direction until it succeeds.
  • the second method is to perform LBT for a direction corresponding to a certain beam. If the time exceeds a certain threshold, switch to performing a LBT in a direction corresponding to another beam.
  • the base station maintains a counter and performs LBT operations in a direction corresponding to a beam until a preset time period is exceeded. If it fails, it switches to another counter, the counter value is reset, and it switches to a direction corresponding to another beam to perform LBT operations.
  • the base station maintains a counter, performs LBT in a direction corresponding to a beam, does not access the channel after exceeding a certain threshold 1, and then switches to another counter, and the counter value is reset.
  • the third method is to perform LBT in the direction corresponding to each beam by using the sequence of the beam scan.
  • the time granularity of the scan is configurable. For example, it can be a Clear Channel Assessment Slot (CCA slot). It can also be an integer multiple of OFDM symbols.
  • CCA slot Clear Channel Assessment Slot
  • the base station performs LBT in the direction corresponding to each beam, and then sends a channel occupancy request signal on the beam whose LBT has been successfully obtained.
  • the base station maintains multiple counters, and performs LBT operations in the direction corresponding to a beam until the preset time period is exceeded. If it fails, it switches to another counter. The original counter value is retained, and it switches to other directions to perform LBT operations. ;or,
  • the base station maintains multiple counters and performs LBT operations in the direction corresponding to a beam until the preset time period is exceeded. If it fails, it switches to another counter. The original counter value is retained until the number of times exceeding the preset time period exceeds the preset value. Reset and switch to the direction corresponding to the other beam to perform the LBT operation;
  • the base station maintains multiple counters, and after performing LBT in a beam direction that exceeds a certain threshold 1 and does not access the channel, it switches to another counter, and the original counter value is retained. Or it will be reset only after a certain threshold value 2 is exceeded.
  • the base station maintains multiple counters and performs LBT operations in the direction corresponding to each beam by using the time-division method of the beam scan.
  • the time granularity of the scan is configurable.
  • the base station maintains multiple counters, and performs LBT in the direction corresponding to each beam using the sequence of the beam scan.
  • the time granularity of the scan is configurable, for example, it can be an integer multiple of CCA slot. It can also be an integer multiple of the OFDM symbol.
  • the base station performs LBT in the direction corresponding to each beam, and maintains multiple counters based on the results of the LBT.
  • the behavior of the base station may be to abandon the LBT in the directions corresponding to the other beams, or to continue to perform the LBT in the directions corresponding to the other beams. Need.
  • the signal allowing the channel to be occupied is fed back the signal allowing the channel to be occupied by interlace information dynamically indicated by the base station; and / or,
  • the signal allowing the channel to be occupied is fed back the signal allowing the channel to be occupied through the interlace information configured semi-statically for the terminal by the network.
  • the signal allowing the channel to be occupied is fed back the signal allowing the channel to be occupied by interlace information dynamically indicated by the base station; and / or,
  • the signal allowing the channel to be occupied is fed back the signal allowing the channel to be occupied through the interlace information configured semi-statically for the terminal by the network.
  • the signal allowing the channel to be occupied is fed back according to the interlace information indicated by the base station.
  • the terminal after receiving the channel occupation request signal, the terminal needs to feed back a signal allowing the channel to be occupied to the base station.
  • the licensed carrier assisted access adopts an interlace structure, that is, multiple physical resource blocks (PRB). It is evenly distributed as an interlace in the frequency domain. For example, the full bandwidth is 100 PRBs, and every 10 PRBs occupy one interlace. The full bandwidth supports 10 interlace and up to 10 users. Therefore, the base station can configure the interlace information for the UE to feed back the transmission of the signal that allows the channel to be occupied, that is, the transmission channel occupation request signal may include the interlace information allocated to the UE to feed back the transmission of the signal that allows the channel to be occupied, such as the interleaving index (interlace index). This type of instruction requires some overhead;
  • the network semi-statically configures an available interlace set for the UE, and the terminal can freely select the interlace to send.
  • the UEID information can be included in the signal allowing the channel to be occupied.
  • the channel occupancy request signal feeds back a signal allowing the channel to be occupied through time information configured by the base station for the terminal; or,
  • the channel occupation request signal is fed back by each terminal at the same time.
  • the base station configures LBT parameters for the terminal to feed back signals that allow the channel to be occupied.
  • the LBT parameter includes the size of the counter or the size of the competition window used to generate the counter.
  • the channel occupancy request signal feeds back signals that allow the channel to be occupied through the time information configured by the base station for the terminal.
  • the receiving base station configures LBT parameters for the terminal to feed back signals that allow the channel to be occupied;
  • LBT is performed according to the size of the counter included in the LBT parameter or the size information of the competition window used to generate the counter.
  • Example 5 a frequency domain transmission scheme for a scheduled multi-user to send a signal allowing a channel to be occupied is provided. For the time when the scheduled multiple users send an occupied signal, there may be the following scheme:
  • the base station can configure the terminal with the LBT parameters that the UE needs to use to send the signal that allows the channel to be occupied.
  • the LBT parameters that the UE needs to use to send signals that allow the channel to be occupied, such as the LBT type. If the LBT type is LBT cat.4, it can also give the size of the counter or the size of the competition window used to generate the counter.
  • Another solution is to transmit signals that allow the channel to be occupied in a time-division manner. For example, different terminals transmit signals that allow the channel to be occupied on different OFDM symbols.
  • the base station can configure a feedback channel occupation request signal for the terminal. Time information, the base station includes the time information of the feedback channel occupation request signal in the channel occupation request signal or the uplink scheduling signaling of the base station.
  • a time unit sent by multiple beams can generally only be transmitted in one beam direction, so the base station can sequentially send a channel occupation request signal to the terminal on at least one beam.
  • the base station when performing LBT in multiple beam directions, when transmitting a channel occupation request signal, first determine a beam direction that is allowed to transmit the channel occupation request signal. Examples of certain methods, such as the first carrier to successfully perform LBT, at this time, not all the beam directions described above are in the LBT phase, some beam directions have been successfully LBT, and there are other beam directions that have not yet succeeded.
  • the base station sends the channel occupancy request signal in the beam direction determined previously.
  • the base station may be allowed to go to other beam directions to perform LBT first, and then return to the beam direction in which the channel occupation request signal was originally sent to receive the channel that is allowed to be occupied within the corresponding time window. signal. So there are two schemes when multiple beamLBT is allowed.
  • Solution 1 After the base station sends a channel occupancy request signal to the terminal on the beam, the base station waits to receive a signal on the beam that allows the channel to be occupied, that is, after sending the channel occupancy request signal, it waits on the beam direction to receive the channel to be occupied signal of.
  • Solution 2 After the base station sends a channel occupancy request signal to the terminal on the beam, it continues to send the channel occupancy request signal to the terminal on the next beam, and receives the corresponding signal that allows the channel to be occupied on the beam that has sent the channel occupancy request signal. That is, after sending the channel occupancy request signal, scanning is continued on other beams.
  • the channel occupation request signal is transmitted by using a subcarrier of 60K or more.
  • the channel occupation request signal is transmitted by using a subcarrier of 60K or more.
  • the gap gap between the request signal occupying signal and the handshaking signal allowing the channel occupying signal is an integer multiple of the OFDM symbol.
  • the interval between the signal occupation signal and the allowed channel occupation signal is 1 OFDM symbol;
  • the interval between the signal occupation signal and the allowed channel occupation signal is 2 to 3 OFDM symbols; or,
  • the interval between the request signal occupation signal and the allowed channel occupation signal is 4 to 6 OFDM symbols; or,
  • the interval between the signal occupation signal and the allowed channel occupation signal is 8 to 12 OFDM symbols.
  • the interval value is notified by the base station to the terminal through signaling, or the network and the terminal agree in advance.
  • the base station does not confirm to obtain the channel occupation right after sending the channel occupation request signal.
  • the terminal may directly send a signal allowing the channel to be occupied without using LBT. It is stipulated in ETSI that the short control signaling does not need to perceive the channel. For example, the interval between the RTS frame and the CTS frame of WiFi is 16us, and the CTS does not need to listen.
  • NR supports flexible baseband parameters (numerology), as shown in the following table:
  • the channel occupation request signal / the signal to allow the channel to be occupied can be transmitted using subcarriers of 60K and above.
  • the corresponding subcarrier size can be adopted according to the frequency band used as needed.
  • the interval between the request signal occupation signal and the allowed channel occupation signal is 1 OFDM symbol; the interval between the occupied signal of the 120K subcarrier interval request signal and the allowed channel occupation signal is 2-3 OFDM symbols; the interval between the occupied signal of the 240K subcarrier interval request signal and the allowed channel occupation signal is 4- 6 OFDM symbols; the interval between the 480K subcarrier interval request signal occupied signal and the allowed channel occupied signal is 8-12 OFDM symbols.
  • FIG. 4 is a schematic flowchart of a method for sending a request signal at a base station side, as shown in the figure, which may include:
  • Step 401 The base station determines a channel occupancy request signal to be sent, where the channel occupancy request signal is a signal requesting the terminal to perform channel occupancy after the base station monitors the LBT operation before the conversation in a direction corresponding to at least one beam beam.
  • Step 402 The base station schedules sending of the channel occupation request signal on a downlink control channel.
  • a channel occupation request signal scheduled by a downlink control channel (such as a physical downlink control channel (PDCCH)) may be sent.
  • a downlink control channel such as a physical downlink control channel (PDCCH)
  • the downlink control channel may be scrambled by a Radio Network Temporary Identity (RNTI) dedicated to the channel occupation request signal.
  • RNTI Radio Network Temporary Identity
  • the control information for the PDCCH scheduling may include frequency domain information, time domain information, and beam information for successful LBT transmission of feedback-allowed channel transmission signals.
  • 1-bit channel occupancy request signal indication information it can also contain LBT related information that allows channel occupancy signals to be fed back.
  • the RNTI dedicated to the channel occupancy request signal is associated with a tracking area (TA) ID or a wake-up signal (WUS) area ID.
  • TA tracking area
  • WUS wake-up signal
  • the number of candidate PDCCH (candidates) in the PDCCH search space can also be limited to a fixed value
  • a user-specific sequence or a Cell-specific sequence occupying the full bandwidth is transmitted before the RNTI scrambled downlink control channel (such as the PDCCH) based on the channel occupation request signal.
  • FIG. 5 is a schematic flowchart of a method for receiving a request signal on a terminal side. As shown in the figure, it may include:
  • Step 501 The terminal detects a downlink control channel sent by a scheduling channel occupancy request signal.
  • the channel occupancy request signal is a signal requesting the terminal to perform channel occupancy after the base station monitors the LBT operation before the conversation in a direction corresponding to at least one beam beam. ;
  • Step 502 The terminal receives a channel occupation request signal according to a detection result.
  • the terminal detects a downlink control channel (such as a PDCCH) scrambled by the RNTI dedicated to the channel occupation request signal.
  • a downlink control channel such as a PDCCH
  • the terminal detects the PDCCH according to a static or semi-static configuration search space
  • the terminal first detects the UE-specific preamble sequence or the cell-specific before detecting the downlink control channel.
  • control information corresponding to the downlink control channel when scheduling on the downlink control channel is scrambled by using the RNTI dedicated to the channel occupation request signal.
  • the exclusive RNTI is associated with a TA ID or a WUS area ID.
  • control information may include one or a combination of the following information:
  • Beam information for LBT success 1-bit channel occupancy request signal indication information, and information related to the terminal feedback allowed channel occupancy signal.
  • the information related to the terminal feedback allowed channel occupation signal may include one or a combination of the following information:
  • Feedback of frequency domain information of allowed channel occupied signals feedback of time domain information of allowed channel occupied signals, feedback of LBT-related information used by feedback allowed channel occupied signals, interlace information allocated to UE feedback of transmission of allowed channel occupied signals .
  • the downlink control information may include part or all of the following fields: beam information used when sending a channel occupation request signal, such as beam ID or 1-bit channel occupation request signal indication information;
  • the terminal and the terminal feedback information related to the allowed channel occupation signal for example, the LBT mechanism adopted by the feedback allowed channel occupation signal; and the information related to the transmission resource of the signal allowed channel occupation.
  • the base station uses the PDCCH to schedule the channel occupation request signal transmission.
  • the PDCCH uses the radio network temporary identifier (RNTI) for scrambling.
  • RNTI radio network temporary identifier
  • CRC Cyclic Redundancy Check
  • the PDCCH may include beam information such as beam ID or 1-bit channel occupancy request signal indication information used when sending the channel occupancy request signal; and information related to the terminal feedback allowed channel occupancy signal: such as the feedback allowed channel occupancy signal. LBT mechanism;
  • the network is configured with a tracking area (TA).
  • TA tracking area
  • Each TA includes multiple base stations, and the identity of the TA is TA ID.
  • the TA may include many base stations, and a large number of UEs may be included in the TA range. This brings great difficulties in designing the wake-up signal (WUS) of the UE. Therefore, in the prior art, a tracking area is considered to be divided into multiple Wake up area.
  • the RNTI dedicated to the request signal may also be associated with TA ID or WUS area ID. For example, it may be a modulo operation between TA ID or WUS ID and the cell sequence number.
  • the licensed carrier assisted access uses an interlace structure, that is, multiple physical resource blocks (PRBs) are evenly distributed.
  • PRBs physical resource blocks
  • the full bandwidth is 100 PRBs, and every 10 PRBs occupy an interlace.
  • the full bandwidth supports 10 interlace and up to 10 users. Therefore, the base station needs to configure user equipment (User Equipment, UE) feedback information related to transmission resources that allow channel occupied signals, such as transmitted interlace information.
  • the PDCCH that can schedule channel occupation request signals should include allocation to The UE feeds back interlace information, such as interlace index, which allows transmission of the channel occupied signals.
  • the control information sent on the PDCCH can also contain beam information of LBT success, which helps other nodes determine the size of the interference; this information in the PDCCH contains the time gap between when the UE feedback allows the channel occupation signal and the channel occupation request signal (gap) information.
  • the base station can configure different UEs to feed back channel occupancy signals on different or the same OFDM symbols.
  • this gap information can be carried in the PDCCH or in the channel occupancy request signal.
  • the UE is notified of the static signaling.
  • the PDCCH may also include 1-bit channel occupancy request signal indication information; it may also include LBT-related information used to feed back the channel occupancy signal, such as the LBT type, and the size of the counter used for random fallback.
  • the terminal detects the downlink control channel sent by the scheduling channel occupation request signal according to the static or semi-static configuration search space.
  • the number of PDCCH candidates in the PDCCH search space of the detected PDCCH is a fixed value.
  • the number of PDCCH candidates in the PDCCH search space of the PDCCH transmitting the control information is a fixed value.
  • the base station statically or semi-statically configures the channel to occupy the transmission resource of the PDCCH information scrambled by the RNTI dedicated to the request signal.
  • the search space carrying the PDCCH can be configured as a common search space
  • the PDCCH can be further configured.
  • the corresponding aggregation level for example, if the aggregation level is configured to the highest allowed value, such as type 2 PDCCH (type 2 PDCCH), when the common search space aggregation level is 16, the number of PDCCH candidates is 1.
  • the base station configures the number of search PDCCH PDCCH candidates corresponding to the control channel of the channel occupation request signal to 1, so that the terminal blindly detects the PDCCH on the specified resource according to the semi-static configuration of the base station. Limitation will greatly reduce the number of blind detections of the PDCCH corresponding to the channel occupation request signal, thereby greatly reducing power consumption.
  • a UE-specific sequence is transmitted.
  • the UE-specific sequence is a UE-specific reference signal
  • the UE-specific sequence is part of the WUS signal.
  • the reference signal is a function of a DMRS signal used on a PDCCH corresponding to a channel transmitting a channel occupation request signal.
  • the reference signal is a function of the DMRS signal, which means that the reference signal is consistent with the pattern of the DMRS signal; or the reference signal is a repetition of the DMRS signal in the time-frequency domain; or the reference signal reuses the DMRS signal.
  • the UE-specific sequence is a part of the WUS signal, which means that the UE-specific sequence is a subset of the WUS sequence corresponding to RRC_Connected.
  • it further includes one or a combination of the following processes for UE-specific sequence frequency domain mapping:
  • the frequency-domain transmission resources of the UE-specific sequence are a function of the PDCCH frequency-domain transmission resources corresponding to the UE; or,
  • the UE-specific sequence occupies full bandwidth for transmission; or,
  • the UE-specific sequence is transmitted in an interlace manner.
  • a UE-specific sequence is detected.
  • the UE-specific sequence is a UE-specific reference signal
  • the UE-specific sequence is part of the WUS signal.
  • the reference signal is a function of a DMRS signal used on a PDCCH corresponding to a channel transmitting a channel occupation request signal.
  • the reference signal is a function of the DMRS signal, which means that the reference signal is consistent with the pattern of the DMRS signal; or the reference signal is a repetition of the DMRS signal in the time-frequency domain; or the reference signal reuses the DMRS signal.
  • the UE-specific sequence is a part of the WUS signal, which means that the UE-specific sequence is a subset of the WUS sequence corresponding to RRC_Connected.
  • it further includes one or a combination of the following processes for UE-specific sequence frequency domain mapping:
  • the frequency-domain transmission resources of the UE-specific sequence are a function of the PDCCH frequency-domain transmission resources corresponding to the UE; or,
  • the UE-specific sequence occupies full bandwidth for transmission; or,
  • the UE-specific sequence is transmitted in an interlace manner.
  • the base station sends a UE-specific sequence before the channel occupation request signal, and the sequence can have two schemes as follows:
  • the UE-specific sequence is a UE-specific reference signal (RS).
  • the reference signal may be a function of the channel occupation request signal mapping the DMRS signal of the PDCCH, that is, the DMRS sequence is used as one of the input values.
  • Get the UE-specific sequence for example:
  • Alt.1 DMRS signal of a power-up PDCCH.
  • DMRS demodulation reference signal
  • Alt.2 The DMRS signal of the PDCCH is repeated in the time-frequency domain.
  • Figure 6 is a schematic diagram of UE specific RS generation.
  • a DMRS pattern of the PDCCH in the NR is used in an Orthogonal Frequency Division Multiplex (OFDM) symbol.
  • OFDM Orthogonal Frequency Division Multiplex
  • the specific value of the DMRS signal is a sequence specific to the UE. Copying the DMRS pattern will obtain the DMRS pattern shown on the right side of the figure.
  • the DMRS density on the right side of the figure is much denser than the original DMRS;
  • the PDCCH may be multiple OFDM symbols, and all or part of the multiple OFDM symbols may be DMRS to perform a copy operation. For example, copying between subcarriers in the same frequency domain yields a new denser DMRS than the original PDCCH.
  • the pilot signal is the time-frequency domain repetition process of the DMRS signal of the PDCCH.
  • the foregoing UE-specific dense DMRS sequence can occupy one OFDM symbol, of course, it does not exclude that it occupies multiple OFDM symbols. If there are multiple OFDM symbols, the generation method is similar. If the density of the DMRS does not increase, if it is located before the PDCCH, it is better to increase the power of the DMRS. If the DMRS is not independent of the PDCCH transmission, the original DMRS design can be reused.
  • This sequence, no matter which function is obtained by using DMRS, the detection process of the UE can be as follows: the UE first blindly detects the sequence, and only detects the sequence before detecting the channel occupation request signal.
  • the advantage of this solution is that it enables the UE to detect UE-specific reference signals, avoid direct detection of the PDCCH, and avoid polar decoding, thereby achieving the purpose of power saving.
  • another advantage is that when the PDCCH is decoded later, the UE-specific reference signal sent earlier can be reused to improve the channel estimation accuracy of the PDCCH. It can be sent before or after the PDCCH.
  • Solution 2 The UE-specific sequence is part of the WUS signal.
  • NB-IoT Narrow Band Internet of Things
  • WUS wake-up signal
  • the WUS signal is UE-specific. Since WUS is also a sequence, it can be considered. Use WUS to identify whether your own signal is coming.
  • NR and WUS design need to consider idle state RRC (RRC_IDLE), active state RRC (RRC_Inactive) and connected state RRC (RRC_Connected). There are three states. In practice, the corresponding subset of RRC_Connected in the WUS sequence can be sent before PDCCH.
  • the UE judges whether the PDCCH arrives by blindly detecting a subset of WUS.
  • the UE-specific sequence frequency domain mapping method may be as follows:
  • the frequency-domain transmission resources of the UE-specific sequence are a function of the PDCCH frequency-domain transmission resources mapped by the UE, for example, the WUS subset frequency domain of the UE occupies all sub-carriers of the UE transmitting the PDCCH and its mapped pilot.
  • the sequence occupies full bandwidth transmission, for example, the sequence is an orthogonal sequence.
  • the UE specific sequence is sent in interlace mode.
  • the frequency domain granularity of each interlace may not be PRB, such as the number of subcarriers is less than 12.
  • the base station side may further include:
  • a Cell-specific sequence is transmitted.
  • the scrambling can be performed by using the RNTI dedicated to the channel occupation request signal, or by using the UE ID.
  • the terminal may further include:
  • a Cell-specific sequence is detected.
  • Embodiment 3 detects a UE-specific sequence before detecting a channel occupation request signal, and this solution will significantly reduce UE power consumption. However, because the sequence is UE-specific, this will cause other unscheduled UEs or other base stations to fail to receive the channel occupancy request signal, and thus it will not be able to know the frequency domain resources of the channel occupancy signal sent back by the UE.
  • the base station sends a Cell-specific sequence before the channel occupation request signal, and the sequence occupies the full bandwidth. All UEs in the cell detect the cell-specific sequence. Once the sequence is detected, Start to detect the PDCCH.
  • the solution of Embodiment 2 can be used to limit the PDCCH aggregation level or the number of PDCCH candidates is set to a fixed value, such as 1.
  • the PDCCH scrambling method does not exclude other scrambling methods in addition to the RNTI scrambling dedicated to the channel occupation request signal.
  • the above UE-specific sequence or the cell-specific sequence and the channel occupancy request signal map the PDCCH in a better time domain position relationship.
  • This sequence is located before the PDCCH or frequency division multiplexed with the PDCCH. It does not exclude that the sequence is located after the PDCCH Special case, but only when the UE detects the sequence, it starts to detect the channel occupation request signal.
  • embodiments of the present invention further provide a base station, user equipment, and a device for sending and receiving request signals. Since the principle of solving the problem by these devices is similar to the method of sending and receiving request signals, For implementation, refer to the implementation of the method.
  • FIG. 7 is a schematic structural diagram of a base station. As shown in the figure, the base station includes:
  • the processor 700 is configured to read a program in the memory 720 and execute the following processes:
  • the channel occupancy request signal is a signal requesting the terminal to perform channel occupancy after monitoring the LBT operation before the dialog in a direction corresponding to at least one beam beam;
  • the transceiver 710 is configured to receive and send data under the control of the processor 700, and execute the following processes:
  • the sending of the channel occupation request signal is scheduled on a downlink control channel.
  • control information corresponding to the downlink control channel when scheduling on the downlink control channel is scrambled by using the RNTI dedicated to the channel occupation request signal.
  • the exclusive RNTI is associated with a TA ID or a WUS area ID.
  • it further includes:
  • a UE-specific sequence or a Cell-specific sequence is transmitted.
  • the UE-specific sequence is a UE-specific reference signal
  • the UE-specific sequence is part of the WUS signal.
  • the reference signal is a function of a DMRS signal used on a PDCCH corresponding to a channel transmitting a channel occupation request signal.
  • the reference signal is a function of the DMRS signal, which means that the reference signal is consistent with the pattern of the DMRS signal; or the reference signal is a repetition of the DMRS signal in the time-frequency domain; or the reference signal reuses the DMRS signal.
  • it further includes one or a combination of the following processes for UE-specific sequence frequency domain mapping:
  • the frequency-domain transmission resources of the UE-specific sequence are a function of the PDCCH frequency-domain transmission resources corresponding to the UE; or,
  • the UE-specific sequence occupies full bandwidth for transmission; or,
  • the UE-specific sequence is transmitted in an interlace manner.
  • it further includes:
  • a Cell-specific sequence is transmitted.
  • the downlink control channel is a PDCCH
  • the number of PDCCH candidates in the PDCCH search space of the PDCCH transmitting the control information is a fixed value.
  • control information includes one or a combination of the following information:
  • Beam information for LBT success 1-bit channel occupancy request signal indication information, and information related to the terminal feedback allowed channel occupancy signal.
  • the information related to the terminal feedback allowed channel occupation signal includes one or a combination of the following information:
  • Feedback of frequency domain information of allowed channel occupied signals feedback of time domain information of allowed channel occupied signals, feedback of LBT-related information used by feedback allowed channel occupied signals, interlace information allocated to UE feedback of transmission of allowed channel occupied signals .
  • the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 700 and various circuits of the memory represented by the memory 720 are linked together.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, so they are not further described herein.
  • the bus interface provides an interface.
  • the transceiver 710 may be multiple elements, including a transmitter and a transceiver, providing a unit for communicating with various other devices over a transmission medium.
  • the processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 when performing operations.
  • FIG. 8 is a schematic structural diagram of a UE. As shown in the figure, the user equipment includes:
  • the processor 800 is configured to read a program in the memory 820 and execute the following processes:
  • the channel occupancy request signal being a request signal for a channel occupancy request from a terminal after monitoring a LBT operation before a conversation in a direction corresponding to at least one beam beam;
  • the transceiver 810 is configured to receive and send data under the control of the processor 800, and execute the following processes:
  • a channel occupancy request signal is received according to a detection result.
  • control information corresponding to the downlink control channel when scheduling on the downlink control channel is scrambled by using the RNTI dedicated to the channel occupation request signal.
  • the exclusive RNTI is associated with a TA ID or a WUS area ID.
  • it further includes:
  • a UE-specific sequence or a Cell-specific sequence is detected.
  • the UE-specific sequence is a UE-specific reference signal
  • the UE-specific sequence is part of the WUS signal.
  • the reference signal is a function of a DMRS signal used on a PDCCH corresponding to a channel transmitting a channel occupation request signal.
  • the reference signal is a function of the DMRS signal, which means that the reference signal is consistent with the pattern of the DMRS signal; or the reference signal is a repetition of the DMRS signal in the time-frequency domain; or the reference signal reuses the DMRS signal.
  • it further includes one or a combination of the following processes for UE-specific sequence frequency domain mapping:
  • the frequency-domain transmission resources of the UE-specific sequence are a function of the PDCCH frequency-domain transmission resources corresponding to the UE; or,
  • the UE-specific sequence occupies full bandwidth for transmission; or,
  • the UE-specific sequence is transmitted in an interlace manner.
  • it further includes:
  • a Cell-specific sequence is detected.
  • the search space is detected according to the static or semi-static configuration for the downlink control channel sent by the scheduling channel occupation request signal.
  • the downlink control channel is a PDCCH
  • the number of PDCCH candidates in the PDCCH search space of the detected PDCCH is a fixed value.
  • control information includes one or a combination of the following information:
  • Beam information for LBT success 1-bit channel occupancy request signal indication information, and information related to the terminal feedback allowed channel occupancy signal.
  • the information related to the terminal feedback allowed channel occupation signal includes one or a combination of the following information:
  • Feedback of frequency domain information of allowed channel occupied signals feedback of time domain information of allowed channel occupied signals, feedback of LBT-related information used by feedback allowed channel occupied signals, interlace information allocated to UE feedback of transmission of allowed channel occupied signals .
  • the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 800 and various circuits of the memory represented by the memory 820 are linked together.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, so they are not further described herein.
  • the bus interface provides an interface.
  • the transceiver 810 may be multiple elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium.
  • the user interface 830 may also be an interface capable of externally connecting and connecting the required devices.
  • the connected devices include, but are not limited to, a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 800 when performing operations.
  • An embodiment of the present invention further provides a device for sending a request signal, including:
  • a determining module configured to determine a channel occupation request signal to be sent, where the channel occupation request signal is a request signal for requesting a terminal to perform channel occupation after the base station monitors an LBT operation before dialogue in a direction corresponding to at least one beam beam;
  • the sending module is configured to schedule sending of the channel occupation request signal on a downlink control channel.
  • An embodiment of the present invention further provides a device for receiving a request signal, including:
  • a detection module is configured to detect a downlink control channel sent by a scheduling channel occupancy request signal, which is a request for a channel occupancy request from a terminal after monitoring a LBT operation before a conversation in a direction corresponding to at least one beam beam. signal;
  • the receiving module is configured to receive a channel occupation request signal according to a detection result.
  • each part of the device described above is divided into various modules or units according to functions.
  • the functions of each module or unit can be implemented in the same or multiple software or hardware.
  • the provided solutions include:
  • a channel occupancy request signal is transmitted based on the PDCCH scheduled by the RNTI dedicated to the channel occupancy request signal.
  • the DIC contains some or all of the following fields: the beam information used when sending the channel occupancy request signal, such as beam ID or 1-bit channel occupancy request signal indication information; and its terminal feedback related information that allows the channel occupancy signal: such as feedback allowing channel occupancy The LBT mechanism used by the signal; feedback information related to the transmission resources of the signal that allows the channel to be occupied.
  • the beam information used when sending the channel occupancy request signal such as beam ID or 1-bit channel occupancy request signal indication information
  • its terminal feedback related information that allows the channel occupancy signal such as feedback allowing channel occupancy
  • the LBT mechanism used by the signal feedback information related to the transmission resources of the signal that allows the channel to be occupied.
  • DMRS enhancement where DMRS is a function of PDCCH corresponding to DMRS
  • the embodiments of the present invention may be provided as a method, a system, or a computer program product. Therefore, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
  • computer-usable storage media including, but not limited to, disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a specific manner such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, the instructions
  • the device implements the functions specified in one or more flowcharts and / or one or more blocks of the block diagram.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of steps can be performed on the computer or other programmable device to produce a computer-implemented process, which can be executed on the computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

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Abstract

公开了一种请求信号的发送、接收方法及设备、装置,包括:基站确定需发送的信道占用请求信号,所述信道占用请求信号是基站在至少一个波束对应的方向上执行对话前监听操作后,向终端请求进行信道占用的请求信号;基站在下行控制信道上调度所述信道占用请求信号的发送。终端检测调度信道占用请求信号发送的下行控制信道;终端根据检测结果接收信道占用请求信号。采用本发明克服了现有技术没有针对信道占用请求信号设计的缺陷,实现了eNB信道占用请求信号的发送。进一步的,方案中还提供了可以做到最低耗电的方案。

Description

一种请求信号的发送、接收方法及设备、装置
本申请要求在2018年6月11日提交中国专利局、申请号为201810597788.7、发明名称为“一种请求信号的发送、接收方法及设备、装置”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无线通信技术领域,特别涉及一种请求信号的发送、接收方法及设备、装置。
背景技术
非授权频谱没有规划具体的应用系统,可以为多种无线通信系统共享,目前非授权频段(unlicensed spectrum)现存的通信系统主要有IEEE标准化的蓝牙、WiFi及其3GPP标准化的非授权频段中的长期演进(Long Term Evolution in unlicensed spectrum,LTE-U)系统,多种系统间通过抢占资源的方式使用共享的非授权频谱资源。
为了确保LTE-U为了与WIFI友好共存,3GPP针对对话前监听(listen Before Talk,LBT)技术展开了深入的讨论,提供了4种LBT方案。
Cat.1:无LBT(No LBT);
Cat.2:无随机回退的LBT(LBT without random back-off);
Cat.3:具有固定竞争窗口大小的随机回退的LBT(LBT with random back-off with fixed size of contention window);
Cat.4:具有可变竞争窗口大小的随机回退的LBT(LBT with random back-off with variable size of contention window)。
最后标准化了两种LBT机制,即3GPP定义的LBT cat.2与LBT cat.4。
非授权频段传输距离一般较近,也许覆盖半径不再是基于beam传输的主要理由,但是基于beam传输的引入给LBT机制带来新的变数。对于基于beam传输的非授权频段的新无线接入技术(NR-U)来说明显可以考虑与方向相关的LBT即directional LBT。执行基于方向的LBT,会提供NR-U更多的传输机会。
现有技术的不足在于,为了避免隐藏节点问题,可以将RTS/CTS握手机制应用到NR-U,但现有技术中并没有针对信道占用请求信号进行发送、接收的方案,进一步的,也没有针对功耗消耗来对信道占用请求信号进行设计的技术方案。
发明内容
本发明提供了一种请求信号的发送、接收方法及设备、装置,用以解决现有技术中没有针对信道占用请求信号进行发送、接收的问题。
本发明实施例提供了一种请求信号的发送方法,包括:
基站确定需发送的信道占用请求信号,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
基站在下行控制信道上调度所述信道占用请求信号的发送。
实施中,在下行控制信道上调度时在下行控制信道上对应的控制信息是用所述信道占用请求信号专属的RNTI进行加扰的。
实施中,所述专属的RNTI是与TA ID或者WUS area ID相关联的。
实施中,进一步包括:
在发送RNTI加扰的所述控制信息之前,传输一个UE specific的序列或传输一个Cell specific的序列。
实施中,UE specific的序列为UE specific的参考信号;或,
UE specific的序列为WUS信号的一部分。
实施中,该参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
实施中,该参考信号是DMRS信号的函数,是指该参考信号与DMRS信号的pattern保持一致;或,该参考信号是DMRS信号在时频域的重复;或,该参考信号重用DMRS信号。
实施中,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
该UE specific序列的频域传输资源是该UE对应的PDCCH频域传输资源的函数;或,
该UE specific序列占据全带宽发送;或,
该UE specific序列采用interlace方式发送。
实施中,进一步包括:
在下行控制信道上调度时对下行控制信道上对应的控制信息进行加扰;
在发送该加扰后的控制信息之前,传输一个Cell specific的序列。
实施中,下行控制信道是PDCCH;
发送所述控制信息的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
实施中,所述控制信息包括以下信息之一或者其组合:
LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道 占用信号相关的信息。
实施中,所述与终端反馈允许信道占用信号相关的信息,包括以下信息之一或者其组合:
反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
本发明实施例提供了一种请求信号的接收方法,包括:
终端检测调度信道占用请求信号发送的下行控制信道,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
终端根据检测结果接收信道占用请求信号。
实施中,在下行控制信道上调度时在下行控制信道上对应的控制信息是用所述信道占用请求信号专属的RNTI进行加扰的。
实施中,所述专属的RNTI是与TA ID或者WUS area ID相关联的。
实施中,进一步包括:
在检测RNTI加扰的所述控制信息之前,检测UE specific的序列或检测Cell specific的序列。
实施中,UE specific的序列为UE specific的参考信号;或,
UE specific的序列为WUS信号的一部分。
实施中,该参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
实施中,该参考信号是DMRS信号的函数,是指该参考信号与DMRS信号的pattern保持一致;或,该参考信号是DMRS信号在时频域的重复;或,该参考信号重用DMRS信号。
实施中,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
该UE specific序列的频域传输资源是该UE对应的PDCCH频域传输资源的函数;或,
该UE specific序列占据全带宽发送;或,
该UE specific序列采用interlace方式发送。
实施中,进一步包括:
在检测加扰的控制信息之前,检测Cell specific的序列。
实施中,终端是根据静态或半静态配置search space检测调度信道占用请求信号发送的下行控制信道的。
实施中,下行控制信道是PDCCH;
检测的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
实施中,所述控制信息包括以下信息之一或者其组合:
LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道占用信号相关的信息。
实施中,所述与终端反馈允许信道占用信号相关的信息,包括以下信息之一或者其组合:
反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
本发明实施例提供了一种基站,包括:
处理器,用于读取存储器中的程序,执行下列过程:
确定需发送的信道占用请求信号,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
收发机,用于在处理器的控制下接收和发送数据,执行下列过程:
在下行控制信道上调度所述信道占用请求信号的发送。
实施中,在下行控制信道上调度时在下行控制信道上对应的控制信息是用所述信道占用请求信号专属的RNTI进行加扰的。
实施中,所述专属的RNTI是与TA ID或者WUS area ID相关联的。
实施中,进一步包括:
在发送RNTI加扰的所述控制信息之前,传输一个UE specific的序列或传输一个Cell specific的序列。
实施中,UE specific的序列为UE specific的参考信号;或,
UE specific的序列为WUS信号的一部分。
实施中,该参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
实施中,该参考信号是DMRS信号的函数,是指该参考信号与DMRS信号的pattern保持一致;或,该参考信号是DMRS信号在时频域的重复;或,该参考信号重用DMRS信号。
实施中,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
该UE specific序列的频域传输资源是该UE对应的PDCCH频域传输资源的函数;或,
该UE specific序列占据全带宽发送;或,
该UE specific序列采用interlace方式发送。
实施中,进一步包括:
在下行控制信道上调度时对下行控制信道上对应的控制信息进行加扰;
在发送该加扰后的控制信息之前,传输一个Cell specific的序列。
实施中,下行控制信道是PDCCH;
发送所述控制信息的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
实施中,所述控制信息包括以下信息之一或者其组合:
LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道占用信号相关的信息。
实施中,所述与终端反馈允许信道占用信号相关的信息,包括以下信息之一或者其组合:
反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
本发明实施例提供了一种用户设备,包括:
处理器,用于读取存储器中的程序,执行下列过程:
检测调度信道占用请求信号发送的下行控制信道,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
收发机,用于在处理器的控制下接收和发送数据,执行下列过程:
根据检测结果接收信道占用请求信号。
实施中,在下行控制信道上调度时在下行控制信道上对应的控制信息是用所述信道占用请求信号专属的RNTI进行加扰的。
实施中,所述专属的RNTI是与TA ID或者WUS area ID相关联的。
实施中,进一步包括:
在检测RNTI加扰的所述控制信息之前,检测UE specific的序列或检测Cell specific的序列。
实施中,UE specific的序列为UE specific的参考信号;或,
UE specific的序列为WUS信号的一部分。
实施中,该参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
实施中,该参考信号是DMRS信号的函数,是指该参考信号与DMRS信号的pattern保持一致;或,该参考信号是DMRS信号在时频域的重复;或,该参考信号重用DMRS信号。
实施中,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
该UE specific序列的频域传输资源是该UE对应的PDCCH频域传输资源的函数;或,
该UE specific序列占据全带宽发送;或,
该UE specific序列采用interlace方式发送。
实施中,进一步包括:
在检测加扰的控制信息之前,检测Cell specific的序列。
实施中,根据静态或半静态配置search space检测调度信道占用请求信号发送的下行控制信道的。
实施中,下行控制信道是PDCCH;
检测的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
实施中,所述控制信息包括以下信息之一或者其组合:
LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道占用信号相关的信息。
实施中,所述与终端反馈允许信道占用信号相关的信息,包括以下信息之一或者其组合:
反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
本发明实施例提供了一种请求信号的发送装置,包括:
确定模块,用于确定需发送的信道占用请求信号,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
发送模块,用于在下行控制信道上调度所述信道占用请求信号的发送。
本发明实施例提供了一种请求信号的接收装置,包括:
检测模块,用于检测调度信道占用请求信号发送的下行控制信道,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
接收模块,用于根据检测结果接收信道占用请求信号。
本发明有益效果如下:
在本发明提供的技术方案中,在基站确定需发送的信道占用请求信号后,基站在下行控制信道上发送所述信道占用请求信号,从而克服了现有技术没有针对信道占用请求信号设计的缺陷,实现了eNB信道占用请求信号的发送。
进一步的,方案中还提供了可以做到最低耗电的方案。
附图说明
此处所说明的附图用来提供对本发明的进一步理解,构成本发明的一部分,本发明的示意性实施例及其说明用于解释本发明,并不构成对本发明的不当限定。在附图中:
图1为本发明实施例中WiFi在非授权频谱上的抢占资源方式示意图;
图2为本发明实施例中基于beam的空间复用示意图;
图3为本发明实施例中LAA与NR-U共存情景示意图;
图4为本发明实施例中基站侧的请求信号的发送方法实施流程示意图;
图5为终端侧的请求信号的接收方法实施流程示意图;
图6为本发明实施例中UE specific RS产生示意图;
图7为本发明实施例中基站结构示意图;
图8为本发明实施例中UE结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
应理解,本发明的技术方案可以应用于各种通信系统,例如:全球移动通讯(Global System of Mobile communication,GSM)系统、码分多址(Code Division Multiple Access,CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access,WCDMA)系统、通用分组无线业务(General Packet Radio Service,GPRS)、长期演进(Long Term Evolution,LTE)系统、先进的长期演进(Advanced long term evolution,LTE-A)系统、通用移动通信系统(Universal Mobile Telecommunication System,UMTS)、新空口(New Radio,NR)等。
还应理解,在本发明实施例中,用户设备(User Equipment,UE)包括但不限于移动台(Mobile Station,MS)、移动终端(Mobile Terminal)、移动电话(Mobile Telephone)、手机(handset)及便携设备(portable equipment)等,该用户设备可以经无线接入网(Radio Access Network,RAN)与一个或多个核心网进行通信,例如,用户设备可以是移动电话(或称为“蜂窝”电话)、具有无线通信功能的计算机等,用户设备还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置。
在本发明实施例中,基站(例如,接入点)可以是指接入网中在空中接口上通过一个或多个扇区与无线终端通信的设备。基站可用于将收到的空中帧与IP分组进行相互转换, 作为无线终端与接入网的其余部分之间的路由器,其中接入网的其余部分可包括网际协议(IP)网络。基站还可协调对空中接口的属性管理。例如,基站可以是GSM或CDMA中的基站(Base Transceiver Station,BTS),也可以是TD-SCDMA或WCDMA中的基站(NodeB),还可以是LTE中的演进型基站(eNodeB或eNB或e-NodeB,evolutional Node B),或者是5G NR中的基站(gNB),本发明并不限定。
发明人在发明过程中注意到:
非授权频谱没有规划具体的应用系统,可以为多种无线通信系统共享,目前非授权频段(unlicensed spectrum)现存的通信系统主要有IEEE标准化的蓝牙、WiFi及其3GPP标准化的非授权频段中的长期演进(Long Term Evolution in unlicensed spectrum,LTE-U)系统,多种系统间通过抢占资源的方式使用共享的非授权频谱资源。
为了确保各种通信系统在非授权频段友好共存,无论是WiFi还是LTE-U都将LBT作为LTE-U竞争接入的基本手段。
802.11系统采用信道接入机制称为载波监听/冲突避免载波监听多址接入/冲突避免(Carrier Sense Multiple Access/Collision Avoidance,CSMA/CA)机制,图1为WiFi在非授权频谱上的抢占资源方式示意图,WiFi系统在非授权频谱上的抢占资源方式如图1所示。首先对信道进行监听,当信道空闲时间达到分布式帧间空间(Distributed Inter-Frame Space,DIFS),便判断当前信道为空闲信道,然后各个等待接入的信道的站点,便进入一个随机回退阶段,用于避免多个站点在相同的资源发生碰撞。此外,为了保证公平性,还规定每个站点不能长期占用频谱资源,到达一定时间或数据传输量上限时,需要释放资源,以供其他WiFi或LTE系统抢占资源。
在WiFi系统中位于距离较远的两个接入点(Access Point,AP)相互不能听到对方,独立向两个站点STA传输数据,但是这两个STA距离很近,此时两个WiFi便互相构成隐藏节点,为了克服隐藏节点问题WiFi还支持请求发送/清除发送协议(Request-To-Send/Clear-To-Send protocol,RTS/CTS)握手机制。即AP广播一个RTS帧,如果站点STA收到RTS会回复一个CTS帧,在RTS/CTS握手机制中携带了本次传输时占用信道的时间。这样附近的节点收到CTS后会停止接入信道,从而避免碰撞发生。
LTE-U为了与WiFi友好共存,针对LBT技术展开了深入的讨论。最后标准化了两种LBT机制,即3GPP定义的LBT cat.2与LBT cat.4。LBT cat.2类似于FBE没有采用随机回退机制,而是采用固定CCA时间如20us;LBT cat.4高度类似于WiFi的CSMA/CA机制,eNB首先要执行一次基于能量检测(Energy Detection,ED)的CCA检测时间是可以配置的,这个CCA检测称为初始CCA(Initial CCA,ICCA),若ICCA能量水平低于预定门限,信道判断为闲,设备立即传输;否则当前信道被占用,设备要接着进行扩展CCA(Extension CCA,ECCA)检测,eNB要先根据竞争窗口q的大小生成一个需要倒计时的计数器(counter)值N,发现 一个空闲CCA时隙counter值减去1,当counter值为0接入信道,发起数据传输过程。
为了提高数据速率,改善高频段的覆盖,新无线接入技术(new radio access technology,NR)中采用了大规模多入多出(Massive Multiple Input Multiple Output,Massive MIMO)技术,特别在毫米波频段,大多数传输节点都采用基于Massive MIMO的波束赋形的数据传输。基于波束(beam)传输的最大特点是空间有多个可能的传输beam,基站与终端需要确定一对最佳的发送与接收beam,NR中规定初始接入阶段,首先基站在各个beam上发送同步信号分组(Synchronization Signal Block,SSB),终端确定最佳的发送beam后反馈给基站,数据传输过程中可以通过媒体接入控制控制单元(Media Access Control Control Element,MAC CE)半静态配置,也可以通过物理下行控制信道(physical downlink control channel,PDCCH)指示终端用于接收数据beam的改变。
非授权频段传输距离一般较近,也许覆盖半径不再是基于beam传输的主要理由,但是基于beam传输的引入给LBT机制带来新的变数。前述的WiFi与LTE-U采用的CSMA/CA机制、LBT cat.2、LBT cat.4信道接入机制实际上都属于全向LBT,对于基于beam传输的非授权频段的新无线接入技术(NR-U)来说明显可以考虑与方向相关的LBT即directional LBT。执行基于方向的LBT,会提供NR-U更多的传输机会。图2为基于beam的空间复用示意图,如图2所示,假定gNB A、gNB与AP距离很近,如采用全向LBT可以相互听到,相同时间内只能一个节点接入信道,如果采用基于方向的LBT,gNB与WiFi会在相同的时间内在不同的beam上传输而互不干扰。
但是基于方向的LBT会带来较严重的隐藏节点问题,图3为LAA与NR-U共存情景示意图,如图3所示,采用全向发送授权载波辅助接入(Licensed Assisted Access,LAA)eNB先接入信道向UE1进行传输,另一个采用基于方向LBT的gNB2的接收波束无法收到gNB1发送的信号,认为信道空闲接入信道向UE2发起传输,如此一来eNB1与gNB2发送的信号会在UE1与UE2处发生碰撞。如果把图3中的LAA的eNB换成一个NR-U的gNB同样问题仍然存在。
如前面所述WiFi为了避免隐藏节点问题,提出了RTS/CTS握手机制。可以将此RTS/CTS握手机制应用到NR-U,基站在beam方向上执行LBT,然后发送信道占用请求信号,终端成功接收信道占用请求信号后,反馈允许信道占用信号,基站成功接收允许信道占用信号,完成信道占用请求信号/允许信道占用信号握手,开始接入信道,进行数据传输。但是信道占用请求信号如何设计如何发送才能功耗消耗才能最低需要研究。
随着移动数据业务量的不断增长,频谱资源越来越紧张,仅使用授权频谱资源进行网络部署和业务传输可能已经不能满足业务量需求。因此3GPP对LTE在非授权频段的传输进行了标准化。目前5G的第一个版本已经冻结了,类似于LTE-U将授权频段的NR技术应用到免许可频段需要根据5G的新特性,展开深入研究。目前NR系统中在针对功耗消耗对信道 占用请求信号进行设计上还没有明确的方案,因此,本发明实施例中给出一种请求信号的发送与接收的方案。下面结合附图对本发明的具体实施方式进行说明。
在说明过程中,将分别从终端与基站侧的实施进行说明,然后还将给出二者配合实施的实例以更好地理解本发明实施例中给出的方案的实施。这样的说明方式并不意味着二者必须配合实施、或者必须单独实施,实际上,当终端与基站分开实施时,其也各自解决终端侧、基站侧的问题,而二者结合使用时,会获得更好的技术效果。
首先对本发明实施例中所涉及的与信道占用请求信号相关的实施进行说明。
在基站侧进行数据传输可以包括:
基站在至少一个beam对应的方向上执行LBT操作后,向终端发送信道占用请求信号用以请求进行信道占用;
基站在接收到允许信道被占用的信号后,在发送信道占用请求信号的beam上进行数据传输。
在终端侧进行信号反馈可以包括:
终端接收基站在至少一个beam上向终端发送的信道占用请求信号,所述信道占用请求信号是用以请求进行信道占用的信号;
终端在正确接收到所述信道占用请求信号后,在接收到该信号的beam上向基站反馈允许信道被占用的信号。
实施中,基站首先在多个beam上依次发送信道占用请求信号,终端收到信道占用请求信号后会在多个beam或者一个beam上回复允许信道被占用的信号。基站成功解出终端发送的允许信道被占用的信号后,进行数据发送。
实施中正确接收表示UE能够正确解出这个信号,如果UE处没有其它强干扰,说明该UE附近不存在其它正在传输的节点;同理UE如果能够正确解码反馈允许占用信号,也只有基站能够解码成功,基站才能获知,有时反馈的beam与接收beam不一致,只有基站正确解码握手信号才算握手成功。
下面结合实例对具体的实施来进行说明。
例1
本例中,在基站侧上:
发送所述信道占用请求信号的beam,是基站在至少一个beam对应的方向上按照时间先后顺序执行LBT操作后,信道检测为空闲的所有或者部分beam。
执行LBT操作的beam是空间的所有可能的beam,和/或,是网络预先确定配置好的部分可能的beam。
信道占用请求信号包含以下信息之一或者其组合:
所调度的UEID的信息、发送所述信道占用请求信号的beam的Beam ID、发送所述信道 占用请求信号的beam在空间中的位置信息、发送所述信道占用请求信号的beam的信道占用时间信息、终端反馈允许信道被占用的信号时所需的资源配置、终端反馈允许信道被占用的信号时所需的LBT类型信息、用于信道质量测量的导频信息。
当基站在多个beam上接收到允许信道被占用的信号时,选择复用用户数最多的beam或者传输容量最大的beam进行数据传输。
相应的,在终端侧上:
所述允许信道被占用的信号包含以下信息之一或者其组合:
与信道占用时间相关的信息、该beam的ID信息、本终端的终端标识(UEID)信息、基于beam的信道质量指示(Channel Quality Indicator,CQI)信道质量信息。
具体的,基站首先在多个beam对应的方向上按照时间先后顺序执行LBT操作,所述的多个beam可以是空间的所有可能的beam,也可以是网络预先确定配置好的部分可能的beam,只有一个beam的情况可以作为一种特例,并不被排除在外,也可以按同样方式实施;所述的LBT方式可以是基于方向性的LBT。
基站在信道检测为空闲的所有或者部分beam上,发送基于beam的信道占用信号请求信号,该信道占用请求信号中可以包含:
所调度的UEID的信息;
发送信道占用请求信号的beam信息,该信息除了可以包含Beam ID的标识,也可以进一步包含beam在空间中的位置信息,如beam的角度等可以确定beam位置的相关信息;
还可以包含信道占用时间信息,如开始占用时间及其最大信道占用时间;
还可以包含终端反馈允许信道被占用信号时的所需的资源配置、终端反馈允许信道被占用的信号时所需的LBT类型信息;
还可以包含导频信息用于信道质量测量。
终端在正确接收了基于某个beam的信道占用信号请求信号后,会针对该beam信道占用信号请求信号反馈一个允许信道被占用的信号,该信号可以占用一个正交频分复用(Orthogonal Frequency Division Multiplex,OFDM)符号,该信号中除了包含与信道占用时间相关的信息外,还可以包含该beam的ID信息,还可以包含UEID信息,可以包含基于beam的CQI信道质量信息,如接收的信号强度指示(Received Signal Strength Indication,RSSI)和/或参考信号接收功率(Reference Signal Received Power,RSRP)/参考信号接收质量(Reference Signal Received Quality,RSRQ)的估计值。
事实上,基于beam的CQI信息对与基站判断是否在该beam上是否有隐藏节点非常重要,基于beam的CQI可以在上行控制信息(Uplink Control Information,UCI)中承载,测量基于beam的CQI所用导频的例子可以是基于信道状态信息参考信号(channel state information reference signal,CSI-RS)或者同步信号块(Synchronization Signal Block,SSB) 中所包含的解调参考信号(demodulation reference signal,DMRS)。
在没有收到允许信道被占用的信号之前,基站不知道是否可以接入信道,所以至少在基站收到允许信道被占用的信号之前,基站在LBT通过的多个beam上发送信道占用请求信号,当然,不排除基站只在一个最佳的beam上发信道占用请求信号的特例;
在终端接收信号时,可以利用多个beam接收信道占用请求信号,译码成功后反馈允许信道被占用的信号。基站成功接收允许信道被占用的信号后,确定可以接入信道,进行数据传输。
终端如果在多个beam上正确解出信道占用请求信号,可以向这多个beam都反馈允许信道被占用的信号,也可以根据基站配置选择几个beam反馈允许信道被占用的信号。
基站根据多个用户设备(User Equipment,UE)反馈的允许信道被占用的信号,来确定接入信道的beam,比如可以选择复用用户数最多或者传输容量最大的beam接入信道进行数据传输,当然只有一个beam的情况就无需选择。
具体实施中也可以考虑调度的公平性,基于各个beam上握手成功信息或还参考用户与数据调度相关的信息,如被调度的次数,需要传输的数据的大小,及其UE的能力等来进行选择。
例2:
本例中,实施中,当基站在多个beam上接收到允许信道被占用的信号时,基站调度信道占用请求信号与允许信道被占用的信号握手成功的用户进行数据传输;和/或,
当基站在多个beam上接收到允许信道被占用的信号时,基站在发送允许信道被占用的信号的用户数与接收信道占用请求信号的用户数之间的比例大于预设值的beam上进行数据传输。
实施中,在发送允许信道被占用的信号的用户数与接收信道占用请求信号的用户数之间的比例大于预设值的beam上,选择LBT时间顺序上占优的beam上进行数据传输。
具体的,基站经常一次欲调度多个终端,基站会在LBT成功的beam上向多个终端发送信道占用请求信号,但是基站成功收到信道占用信号的用户很可能是基站发送请求信道占用信号用户的一个子集。基站收到允许允许信道占用信号后,基站接入信道后只调度请求占用信号/允许占用信号握手成功的用户的上行或者下行数据传输。考虑到反馈允许信道占用信号的用户数是多个,基站另外一种可选的操作方法为可以设定一个门限值,如果在该beam上收到的允许占用信号的UE数目与基站发送请求占用信号的UE数目的比例小于该门限值就不允许基站在该beam上进行信道接入,该门限值大小的一个例子如可设置为20%;
如基站在多个beam上发送了请求信道占用信号,如果终端在多个beam上正确解出信道占用请求信号,可以基于这多个beam都反馈允许信道被占用的信号,也可以根据基站配置选择几个beam反馈允许信道被占用的信号。基站根据多个UE反馈的允许信道被占用的信 号,确定在那个beam上接入信道,可以选择复用用户数最多或者传输容量最大的beam接入信道进行数据传输,另外一种方法利用前面所述的该beam上收到的允许占用信号的数目与发送的请求占用信号的比例小于该门限值大小优先在LBT时间顺序上占优的beam上接入信道。
例3:
如例1的例子,在设备的发送与接收beam的一致性,得到保证的条件下会有较好的效果,但是,如果执行LBT的接收beam与发送信号的beam没有校准因而无法保持是同一个beam的情况下,此时在发送beam对应的方向上执行LBT的意义不是很大,则基站的行为可以是在每个beam对应的方向上不执行LBT,而是直接在允许的beam对应的方向上发送信道占用请求信号,此时终端与基站的其它行为可以与例1一致。
例4:
本例中,在基站侧上:
执行LBT操作的beam是根据信道的先验信息来确定的。
先验信息是是否能够正确传输SSB,或在SSB传输过程中获取的beam的传输性能信息。
具体的,如例1中,基站发送信道占用请求信号的beam有多个,基站可以在所有可能的beam对应的方向上执行LBT,但是这需要比较高的复杂度,因此,基站可以根据先验信息确定可以执行LBT的beam的集合,一种确定方法是借助于信道的先验信息,比如基站可以将能够正确传输SSB的beam作为需要执行LBT的beam集合;也可以将SSB传输过程中确定的某一个最佳beam作为即将执行LBT的beam。
例5:
本例中,在基站侧上:
执行LBT操作包括以下方式之一或者其组合:
针对某个beam对应的方向持续执行LBT操作直到LBT成功;或,
在预设时间段内针对某个beam对应的方向执行LBT,若未成功则切换到其它beam对应的方向上执行LBT操作;或,
利用beam扫描的先后时分的方式在各个beam对应的方向上执行LBT操作。
还可以进一步包括:
在基站接收到允许信道被占用的信号后,停止执行LBT操作或继续执行LBT操作。
具体的,关于对beam对应的方向执行LBT的方式可以如下:
第一种方式是针对某个beam对应的方向持续执行LBT直到LBT成功;
基站维护一个counter,在一个beam对应的方向上执行LBT操作直到LBT成功;
也即,该方式下,基站维护一个counter,会在一个beam方向上一直执行LBT,直到成功。
第二种方式是针对某个beam对应的方向执行LBT如果时间超过某个门限值就切换到其它的beam对应的方向上执行LBT;
基站维护一个counter,在一个beam对应的方向上执行LBT操作直到超过预设时间段,若未成功则切换到其它counter,counter的值重置,并切换到其它beam对应的方向上执行LBT操作;
也即,该方式下,基站维护一个counter,在一个beam对应的方向上执行LBT超过某门限1后没接入信道,就切换到其它counter,counter的值重置。
第三种方式是利用beam扫描的先后时分的方式在各个beam对应的方向上执行LBT,扫描的时间颗粒度是可配置的,比如可以是空闲信道评估时隙(Clear Channel Assessment Slot,CCA slot)的整数倍,也可以是OFDM符号的整数倍,基站在各个beam对应的方向上执行LBT,然后在LBT获得成功的beam上发送信道占用请求信号。
基站维护多个counter,在一个beam对应的方向上执行LBT操作直到超过预设时间段,若未成功则切换到其它counter,原counter的值保留,并切换到其它beam对应的方向上执行LBT操作;或,
基站维护多个counter,在一个beam对应的方向上执行LBT操作直到超过预设时间段,若未成功则切换到其它counter,原counter的值保留至超过预设时间段的次数超过预设值后重置,并切换到其它beam对应的方向上执行LBT操作;
也即,该方式下,基站维护多个counter,在一个beam方向上执行LBT超过某门限1后没接入信道,就切换到其它counter,原counter的值继续保留。或者只有超过某门限值2后才重置。
第四种方式,基站维护多个counter,利用beam扫描的先后时分的方式在各个beam对应的方向上执行LBT操作,其中,扫描的时间颗粒度是可配置的;
也即,该方式下,基站维护多个counter,利用beam扫描的先后时分的方式在各个beam对应的方向上执行LBT,扫描的时间颗粒度是可配置的,比如可以是CCA slot的整数倍,也可以是OFDM符号的整数倍,基站在各个beam对应的方向上执行LBT,根据LBT的结果维护多个counter。
一旦终端发送的允许信道被占用的信号被基站成功接收,基站的行为可以是放弃在其它beam对应的方向上继续执行LBT,也可以是继续在其它beam对应的方向上执行LBT,这取决于实现的需要。
例6:
本例中,在基站侧上:
所述允许信道被占用的信号是通过基站动态指示的interlace信息来反馈允许信道被占用的信号的;和/或,
所述允许信道被占用的信号是通过网络为终端半静态配置的interlace信息来反馈允许信道被占用的信号的。
相应的,在终端侧上:
所述允许信道被占用的信号是通过基站动态指示的interlace信息来反馈允许信道被占用的信号的;和/或,
所述允许信道被占用的信号是通过网络为终端半静态配置的interlace信息来反馈允许信道被占用的信号的。
具体的,所述允许信道被占用的信号是根据基站指示的interlace信息来反馈的。
具体的,终端在接收到信道占用请求信号后需要向基站反馈允许信道被占用的信号。
免许可频段上行传输需要传输功率必须占用信道带宽的80%以上,所以授权载波辅助接入(Licensed Assisted Access,LAA)采用交织(interlace)结构,即多个物理资源块(Physical Resource Block,PRB)均匀的分布在频域作为一个interlace,如全带宽为100个PRB,每隔10个占用一个PRB这样就得到一个interlace,全带宽支持10个interlace最多支持10个用户。所以基站可以为UE配置反馈允许信道被占用的信号的传输的interlace信息,也即,在发送信道占用请求信号中可以包含分配给UE反馈允许信道被占用的信号的传输的interlace信息,如交织索引(interlace index)。此种方式的指示需要一定的开销;
另一种可能的方法是,网络半静态的为UE配置一个可以利用的interlace集合,由终端自由选择interlace发送,此时可以在允许信道被占用的信号中包含UEID的信息。
例7:
本例中,在基站侧上:
所述信道占用请求信号是通过基站为终端配置的时间信息来反馈允许信道被占用的信号的;或,
所述信道占用请求信号是各终端在同一时间反馈的。
还可以进一步包括:
基站为终端配置反馈允许信道被占用的信号需要采用的LBT参数。
在LBT参数中的LBT类型是LBT cat.4时,在LBT参数中包含counter的大小或者用于产生counter的竞争窗口的大小信息。
相应的,在终端侧上:
所述信道占用请求信号是通过基站为终端配置的时间信息来反馈允许信道被占用的信号的。
还可以进一步包括:
接收基站为终端配置反馈允许信道被占用的信号需要采用的LBT参数;
按该LBT参数在接收到该信号的beam对应的方向上进行LBT后,向基站反馈允许信道 被占用的信号。
在LBT参数中的LBT类型是LBT cat.4时,根据在LBT参数中包含的counter的大小或者用于产生counter的竞争窗口的大小信息进行LBT。
具体的,在例5中给出了被调度的多用户发送允许信道被占用的信号的频域传送方案,对于被调度的多个用户发送被占用的信号的时间,可以有如下方案:
多个被调度用户采用相同的时刻传输允许信道被占用的信号,基站可以为终端配置UE发送允许信道被占用的信号需要采用的LBT参数,则在信道占用请求信号,或者基站的上行调度信令中包含UE发送允许信道被占用的信号需要采用的LBT参数,如LBT类型,如果LBT类型是LBT cat.4,还可以给出counter的大小或者用于产生counter的竞争窗口的大小信息。
另外一种方案是,以时分的方式传输允许信道被占用的信号,例如不同的终端在不同的OFDM符号上传输允许信道被占用的信号,此种情形下基站可以为终端配置反馈信道占用请求信号的时间信息,则基站在信道占用请求信号,或者基站的上行调度信令中包含反馈信道占用请求信号的时间信息。
例8:
本例中,多个beam发送的一个时间单位内一般只能在一个beam方向上发送,所以基站可以在至少一个beam上依次向终端发送信道占用请求信号。
实施中,对于在多个beam方向执行LBT时,在发送信道占用请求信号时,首先要确定允许发送信道占用请求信号的beam方向。确定的方法的例子,如率先成功执行LBT的载波,这时不是前面所述的各个beam方向都处于LBT阶段,有的beam方向已经LBT成功,也存在其它beam方向上LBT尚没成功。基站在前面确定的beam方向发送信道占用请求信号,如果信道占用请求信号/允许信道被占用的信号握手时间不是明显大于扫描下一个波束的时间,此时如果先去其它beam方向上执行LBT会导致,无法完成收发转换(Tx/Rx转换射频需要时间)从而到发送信道占用请求信号的beam方向上接收允许信道被占用的信号。但是如果前面所叙述的时间足够长,则可以允许基站先去其它beam方向上执行LBT,然后再回到原发送信道占用请求信号的beam方向上在对应的时间窗内接收允许信道被占用的信号。所以在允许多beamLBT时存在两种方案。
因此,在允许多beam对应的方向上LBT时至少存在两种方案:
方案一,基站在beam上向终端发送信道占用请求信号后,基站在该beam上等待接收允许信道被占用的信号,即,发送完信道占用请求信号,在该beam方向上等待接收允许信道被占用的信号。
方案二,基站在beam上向终端发送信道占用请求信号后,继续在下一个beam上向终端发送信道占用请求信号,并在发送过信道占用请求信号的beam上接收相应的允许信道被占 用的信号,即,发送完信道占用请求信号后,在其它beam上继续扫描。
当然前面执行LBT的beam对应的方向只有一个,只能利用方案一。
例9:
本例中,在基站侧上:
所述信道占用请求信号是采用60K及60k以上的子载波进行发送的。
相应的,在终端侧上:
所述信道占用请求信号是采用60K及60k以上的子载波进行发送的。
具体实施中,实施中,请求信号占用信号与允许信道占用信号的握手信号间的间隔gap是OFDM符号的整数倍。
实施中,所述信道占用请求信号是采用60K的子载波进行发送时,请求信号占用信号与允许信道占用信号间的间隔为1个OFDM符号;或,
所述信道占用请求信号是采用120K的子载波进行发送时,请求信号占用信号与允许信道占用信号间的间隔为2至3个OFDM符号;或,
所述信道占用请求信号是采用240K的子载波进行发送时,请求信号占用信号与允许信道占用信号间的间隔为4至6个OFDM符号;或,
所述信道占用请求信号是采用480K的子载波进行发送时,请求信号占用信号与允许信道占用信号间的间隔为8至12个OFDM符号。
实施中,所述间隔值是基站通过信令通知终端,或者网络与终端预先约定的。
具体的,基站发送信道占用请求信号后并未确认获得信道占用权,为了防止信道被其它系统抢去,终端可以不采用LBT,直接发送允许信道被占用的信号。在ETSI中规定短控制信令可以不用感知信道,如WiFi的RTS帧与CTS帧之间隔为16us,CTS不用听信。NR支持灵活的基带参数(numerology),具体如下表所示:
Figure PCTCN2019083738-appb-000001
所以,为了确保允许信道被占用的信号不用执行LBT,信道占用请求信号/允许信道被占用的信号可以采用60K及60k以上的子载波进行发送。对于数据发送子载波可以根据所采用的频段根据需要采用相应的子载波大小。在子载波间隔大于等于60K的情形为了避免允许信道占用信号执行LBT操作,且为终端解码信道占用请求信号预留时间,对于60K子载波间隔,请求信号占用信号与允许信道占用信号间的间隔为1个OFDM符号;对于120K子 载波间隔请求信号占用信号与允许信道占用信号间的间隔为2-3个OFDM符号;对于240K子载波间隔请求信号占用信号与允许信道占用信号间的间隔为4-6个OFDM符号;对于480K子载波间隔请求信号占用信号与允许信道占用信号间的间隔为8-12个OFDM符号。
在对与信道占用请求信号相关的实施进行说明后,下面对请求信号的发送与接收的方案实施进行说明。
图4为基站侧的请求信号的发送方法实施流程示意图,如图所示,可以包括:
步骤401、基站确定需发送的信道占用请求信号,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
步骤402、基站在下行控制信道上调度所述信道占用请求信号的发送。
具体的,可以发送下行控制信道(如物理下行控制信道(physical downlink control channel,PDCCH))调度的信道占用请求信号。
该下行控制信道可以被信道占用请求信号专属的无线网络临时识别(Radio Network Temporary Identity,RNTI)加扰。
在PDCCH调度的控制信息中可以包含反馈允许信道被占用的信号的传输的频域信息,时域信息,LBT成功的beam信息。1比特的信道占用请求信号指示信息;还可以包含反馈允许信道占用信号采用的LBT相关信息。
信道占用请求信号专属的RNTI与跟踪区域(tracking area,TA)ID或者唤醒信号(Wake Up Signal,WUS)area ID相关联。
还可以将PDCCH搜索空间(PDCCH search space)中候选PDCCH(PDCCH candidates)个数限制为固定值;
在基于信道占用请求信号的RNTI加扰的下行控制信道(如PDCCH)之前传输一个用户专属(UE specific)的序列或者传输一个Cell specific的占据全带宽的序列。
图5为终端侧的请求信号的接收方法实施流程示意图,如图所示,可以包括:
步骤501、终端检测调度信道占用请求信号发送的下行控制信道,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
步骤502、终端根据检测结果接收信道占用请求信号。
具体的,在终端侧,终端检测信道占用请求信号专属的RNTI加扰的下行控制信道(如PDCCH)。
终端根据静态或半静态配置search space检测PDCCH;
终端在检测下行控制信道前先检测UE specific的前导序列或者cell specific。
由于发送与接收是相对应的过程,因此实施中将会侧重说明其中一侧的实施,本领域 技术人员按相应处理即可获知对应侧的实施方式,实施例中并不赘述。
下面结合实施例进行具体说明。
实施例1
实施中,在下行控制信道上调度时在下行控制信道上对应的控制信息是用所述信道占用请求信号专属的RNTI进行加扰的。
实施中,所述专属的RNTI是与TA ID或者WUS area ID相关联的。
实施中,所述控制信息可以包括以下信息之一或者其组合:
LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道占用信号相关的信息。
具体实施中,所述与终端反馈允许信道占用信号相关的信息,可以包括以下信息之一或者其组合:
反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
也即,在下行控制信息(Downlink Control Information,DCI)可以包含部分或者全部以下字段:送信道占用请求信号时所采用的波束(beam)信息如beam ID或者1比特的信道占用请求信号指示信息;及其终端反馈允许信道占用信号相关的信息:如反馈允许信道占用信号采用的LBT机制;反馈允许信道被占用的信号的传输资源相关的信息。
具体的,基站利用PDCCH调度信道占用请求信号传输,该PDCCH利用信道占用请求信号专属的无线网络临时标识(Radio network Temporary Identifier,RNTI)加扰,所谓的加扰,至少有以下实现方式为:
将请求信号专属的RNTI与PDCCH的循环冗余校验(Cyclic Redundancy Check,CRC)比特执行异或运算;
或者将请求信号专属的RNTI与PDCCH的CRC比特与polar码的冻结(frozen)比特执行异或操作。在PDCCH中可以包含发送信道占用请求信号时所采用的beam信息如beam ID或者1比特的信道占用请求信号指示信息;及其终端反馈允许信道占用信号相关的信息:如反馈允许信道占用信号采用的LBT机制;
网络为了支持对处于RRC-idle mode的UE进行寻呼,配置了跟踪区(Tracking area,TA),每个TA中包含多个基站,TA的标识为TA ID。TA可能包含很多基站,在TA范围内可能包含数量庞大的UE,这对设计UE的唤醒信号(Wake Up Signal,WUS)带来较大困难,所以现有技术中考虑将一个Tracking area分割为多个Wake up area。则请求信号专属的RNTI还可以与TA ID或者WUS area ID相关联,如可以是TA ID或者WUS ID与小区序号间的一种模运算。
免许可频段上行传输需要传输功率必须占用信道带宽的80%以上,所以授权载波辅助接入(Licensed Assisted Access,LAA)采用interlace结构即多个物理资源块(Physical Resource Block,PRB)均匀的分布在频域作为一个interlace,如全带宽为100个PRB,每隔10个占用一个PRB这样就得到一个interlace,全带宽支持10个interlace最多支持10个用户。所以在基站需要为用户设备(User Equipment,UE)配置反馈允许信道被占用的信号的传输资源相关的信息如传输的interlace信息,进一步的,还可以在调度信道占用请求信号的PDCCH应该包含分配给UE反馈允许信道被占用的信号的传输的interlace信息,如交织索引(interlace index)。
PDCCH上发送的控制信息还可以包含LBT成功的beam信息,该信息有利于辅助其它节点判断干扰的大小;PDCCH中的该信息包含UE反馈允许信道占用信号时与信道占用请求信号之间的时间间隙(gap)信息,如基站可以配置不同的UE在不同或者相同的OFDM符号上反馈允许信道占用信号,当然这个gap信息除了可以在PDCCH中承载也可以在信道占用请求信号中承载,或者基站通过半静态信令通知UE。PDCCH中还可以包含1比特的信道占用请求信号指示信息;还可以包含反馈允许信道占用信号采用的LBT相关信息,如LBT类型,随机回退采用的计数器(counter)的大小。
实施例2
本例中,在终端侧:
终端是根据静态或半静态配置search space检测调度信道占用请求信号发送的下行控制信道的。
下行控制信道是PDCCH时,检测的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
在基站侧:
下行控制信道是PDCCH时,发送所述控制信息的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
具体的,基站为终端静态的或者半静态的配置信道占用请求信号专属的RNTI加扰的PDCCH信息的发送资源,如可以配置其承载该PDCCH的搜索空间为公共搜索空间,也可以进一步配置该PDCCH对应的聚合等级,如配置其聚合等级为允许的最高值,比如类型2PDCCH(type 2PDCCH),公共搜索空间聚合等级为16时,PDCCH candidates的个数为1。因此基站将信道占用请求信号的控制信道对应的search space的PDCCH candidates的个数配置为1,这样终端根据基站的半静态配置在指定的资源上,盲检PDCCH,而由于该资源被极大的限制,将会大幅度降低信道占用请求信号对应的PDCCH的盲检次数,从而较大幅度降低功耗。
实施例3
本例中,在基站侧:
还可以进一步包括:
在发送RNTI加扰的所述控制信息之前,传输一个UE specific的序列。
实施中,UE specific的序列为UE specific的参考信号;或,
UE specific的序列为WUS信号的一部分。
实施中,该参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
实施中,该参考信号是DMRS信号的函数,是指该参考信号与DMRS信号的pattern保持一致;或,该参考信号是DMRS信号在时频域的重复;或,该参考信号重用DMRS信号。
实施中,UE specific的序列为WUS信号的一部分,是指UE specific的序列为WUS序列中与RRC_Connected对应的子集。
实施中,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
该UE specific序列的频域传输资源是该UE对应的PDCCH频域传输资源的函数;或,
该UE specific序列占据全带宽发送;或,
该UE specific序列采用interlace方式发送。
相应的,在终端侧:
还可以进一步包括:
在检测RNTI加扰的所述控制信息之前,检测UE specific的序列。
实施中,UE specific的序列为UE specific的参考信号;或,
UE specific的序列为WUS信号的一部分。
实施中,该参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
实施中,该参考信号是DMRS信号的函数,是指该参考信号与DMRS信号的pattern保持一致;或,该参考信号是DMRS信号在时频域的重复;或,该参考信号重用DMRS信号。
实施中,UE specific的序列为WUS信号的一部分,是指UE specific的序列为WUS序列中与RRC_Connected对应的子集。
实施中,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
该UE specific序列的频域传输资源是该UE对应的PDCCH频域传输资源的函数;或,
该UE specific序列占据全带宽发送;或,
该UE specific序列采用interlace方式发送。
具体的,如实施例2,虽然将控制信令对应的search space PDCCH candidates的个数配置为1,但是由于控制信道采用polar编码,所以终端仍然需要采用复杂的list decoding算法来译码。为了避免复杂解码,降低功耗,基站在信道占用请求信号之前或者发送一个UE  specific的序列,该序列可以有两种方案如下:
方案一:该UE specific的序列为UE specific的参考信号(reference signal,RS),该参考信号可以是信道占用请求信号对映PDCCH的DMRS信号的函数,即把DMRS序列作为其中的一个输入值,得到该UE specific的序列,例如:
Alt.1:是功率提升的PDCCH的DMRS信号。
即与后面传输PDCCH所采用专用解调参考信号(Dedicate DeModulation Reference Signal,DMRS)保持一致的模式(pattern)。但是由于非授权频段发射功率固定,所以可以在这些DMRS上提升功率,一是降低误检概率,二是防止其它系统抢占信道。
Alt.2:是PDCCH的DMRS信号在时频域的重复。
Alt.3:直接重用PDCCH的DMRS信号进行检测。
图6为UE specific RS产生示意图,如图6所示,图左侧是NR中PDCCH的DMRS pattern在一个正交频分复用(Orthogonal Frequency Division Multiplex,OFDM)符号内采用上述alt.2的一个例子,DMRS信号具体值是一个与UE专属的序列,将该DMRS的pattern进行复制(copy)操作便得到图右侧所示的DMRS pattern,显然图右侧的DMRS密度比原DMRS稠密的多;事实上PDCCH可能是多个OFDM符号,也可以将这多个OFDM符号中的全部或者部分DMRS以进行copy操作,如相同频域子载波间的copy得到新的比原来PDCCH的DMRS稠密的多的导频信号,这就是PDCCH的DMRS信号的时频域重复过程。
前述的UE specific的稠密的DMRS序列,可以占一个OFDM符号,当然不排除占多个OFDM符号,如果是多个OFDM符号其产生方式是相仿的。如果DMRS的密度不增加,如果位于PDCCH之前,较佳的需要对DMRS进行功率提升,如果DMRS不独立于PDCCH传输,可以重用原DMRS设计。该序列,无论采用DMRS的那种函数获得,UE的检测过程可以如下:UE首先盲检该序列,只有检测到该序列才开始检测信道占用请求信号。
该方案的优点在于能够使得UE通过检测UE specific的参考信号,避免直接检测PDCCH从而避免polar译码,达到省电的目的。同时另一个好处是后面解码PDCCH时候能够重用前面发送的UE specific的参考信号提高PDCCH的信道估计精度。可以在PDCCH之前或者之后发送。
方案二:该UE specific的序列是WUS信号的一部分。
目前在窄带物联网(Narrow Band Internet of Things,NB-IoT)功耗研究中考虑增加发送一种唤醒信号WUS触发寻呼信号检测,该WUS信号是UE specific的,既然WUS也是一个序列所以可以考虑利用WUS来识别是否有自己的信号到来。NR WUS设计需要考虑空闲态RRC(RRC_IDLE)、活动态RRC(RRC_Inactive)和连接态RRC(RRC_Connected),三种状态,实施中可以将WUS序列中与RRC_Connected对应子集放在PDCCH之前发送。
这样UE通过盲检WUS的子集,判断PDCCH是否到来。
该UE specific序列频域映射方式可以如下:
1)该UE specific序列的频域传输资源是该UE对映的PDCCH频域传输资源的函数,例如该UE的WUS子集频域占据该UE传输PDCCH及其相映导频的所有子载波。
2)该序列占据全带宽发送,例如该序列是一个正交序列。
3)类似于授权载波辅助接入(Licensed Assisted Access,LAA)的上行传输,该UE specific序列采用interlace方式发送,与LAA不同每个interlace的频域颗粒度可以不是PRB,如子载波个数小于12。
实施例4
实施中,基站侧还可以进一步包括:
在下行控制信道上调度时对下行控制信道上对应的控制信息进行加扰;
在发送该加扰后的控制信息之前,传输一个Cell specific的序列。
加扰可以用信道占用请求信号专属的RNTI进行加扰,也可以用UE ID进行加扰。
相应的,在终端侧还可以进一步包括:
在检测加扰的控制信息之前,检测Cell specific的序列。
实施例3在检测信道占用请求信号之前先检测一个UE specific的序列,该方案会明显降低UE功耗。但是由于该序列是UE specific,这样会导致其它没有被调度的UE或者其它基站无法接收信道占用请求信号,从而也无法获知UE反馈的允许信道占用信号的发送频域资源。
因此另外一种可选的方案为:基站在信道占用请求信号之前或者发送一个Cell specific的序列,该序列占据全带宽,小区内所有的UE都检测此cell specific的序列,一旦检测到该序列就开始检测PDCCH,为了降低功耗可以采用实施例2的方案限制PDCCH聚合等级或者将PDCCH candidates个数设为固定值,如1。
需要指出的是当序列为cell specific时,PDCCH加扰方式除了信道占用请求信号专属的RNTI加扰,并不排除其它加扰方式。
需要说明的上述的UE specific序列或者cell specific序列与信道占用请求信号对映PDCCH的时域位置关系较佳的该序列位于PDCCH之前,或者与PDCCH频分复用,也不排除该序列位于PDCCH之后的特殊情况,但UE只有检测到该序列才开始检测信道占用请求信号。
基于同一发明构思,本发明实施例中还提供了一种基站、用户设备、及请求信号的发送、接收装置,由于这些设备解决问题的原理与请求信号的发送、接收方法相似,因此这些设备的实施可以参见方法的实施,重复之处不再赘述。
在实施本发明实施例提供的技术方案时,可以按如下方式实施。
图7为基站结构示意图,如图所示,基站中包括:
处理器700,用于读取存储器720中的程序,执行下列过程:
确定需发送的信道占用请求信号,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
收发机710,用于在处理器700的控制下接收和发送数据,执行下列过程:
在下行控制信道上调度所述信道占用请求信号的发送。
实施中,在下行控制信道上调度时在下行控制信道上对应的控制信息是用所述信道占用请求信号专属的RNTI进行加扰的。
实施中,所述专属的RNTI是与TA ID或者WUS area ID相关联的。
实施中,进一步包括:
在发送RNTI加扰的所述控制信息之前,传输一个UE specific的序列或传输一个Cell specific的序列。
实施中,UE specific的序列为UE specific的参考信号;或,
UE specific的序列为WUS信号的一部分。
实施中,该参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
实施中,该参考信号是DMRS信号的函数,是指该参考信号与DMRS信号的pattern保持一致;或,该参考信号是DMRS信号在时频域的重复;或,该参考信号重用DMRS信号。
实施中,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
该UE specific序列的频域传输资源是该UE对应的PDCCH频域传输资源的函数;或,
该UE specific序列占据全带宽发送;或,
该UE specific序列采用interlace方式发送。
实施中,进一步包括:
在下行控制信道上调度时对下行控制信道上对应的控制信息进行加扰;
在发送该加扰后的控制信息之前,传输一个Cell specific的序列。
实施中,下行控制信道是PDCCH;
发送所述控制信息的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
实施中,所述控制信息包括以下信息之一或者其组合:
LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道占用信号相关的信息。
实施中,所述与终端反馈允许信道占用信号相关的信息,包括以下信息之一或者其组合:
反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反 馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
其中,在图7中,总线架构可以包括任意数量的互联的总线和桥,具体由处理器700代表的一个或多个处理器和存储器720代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起,这些都是本领域所公知的,因此,本文不再对其进行进一步描述。总线接口提供接口。收发机710可以是多个元件,即包括发送机和收发机,提供用于在传输介质上与各种其他装置通信的单元。处理器700负责管理总线架构和通常的处理,存储器720可以存储处理器700在执行操作时所使用的数据。
图8为UE结构示意图,如图所示,用户设备包括:
处理器800,用于读取存储器820中的程序,执行下列过程:
检测调度信道占用请求信号发送的下行控制信道,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
收发机810,用于在处理器800的控制下接收和发送数据,执行下列过程:
根据检测结果接收信道占用请求信号。
实施中,在下行控制信道上调度时在下行控制信道上对应的控制信息是用所述信道占用请求信号专属的RNTI进行加扰的。
实施中,所述专属的RNTI是与TA ID或者WUS area ID相关联的。
实施中,进一步包括:
在检测RNTI加扰的所述控制信息之前,检测UE specific的序列或检测Cell specific的序列。
实施中,UE specific的序列为UE specific的参考信号;或,
UE specific的序列为WUS信号的一部分。
实施中,该参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
实施中,该参考信号是DMRS信号的函数,是指该参考信号与DMRS信号的pattern保持一致;或,该参考信号是DMRS信号在时频域的重复;或,该参考信号重用DMRS信号。
实施中,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
该UE specific序列的频域传输资源是该UE对应的PDCCH频域传输资源的函数;或,
该UE specific序列占据全带宽发送;或,
该UE specific序列采用interlace方式发送。
实施中,进一步包括:
在检测加扰的控制信息之前,检测Cell specific的序列。
实施中,根据静态或半静态配置search space检测调度信道占用请求信号发送的下行控制信道的。
实施中,下行控制信道是PDCCH;
检测的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
实施中,所述控制信息包括以下信息之一或者其组合:
LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道占用信号相关的信息。
实施中,所述与终端反馈允许信道占用信号相关的信息,包括以下信息之一或者其组合:
反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
其中,在图8中,总线架构可以包括任意数量的互联的总线和桥,具体由处理器800代表的一个或多个处理器和存储器820代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起,这些都是本领域所公知的,因此,本文不再对其进行进一步描述。总线接口提供接口。收发机810可以是多个元件,即包括发送机和接收机,提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户设备,用户接口830还可以是能够外接内接需要设备的接口,连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。
处理器800负责管理总线架构和通常的处理,存储器820可以存储处理器800在执行操作时所使用的数据。
本发明实施例还提供了一种请求信号的发送装置,包括:
确定模块,用于确定需发送的信道占用请求信号,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
发送模块,用于在下行控制信道上调度所述信道占用请求信号的发送。
具体可以参见请求信号的发送方法及基站的实施。
本发明实施例还提供了一种请求信号的接收装置,包括:
检测模块,用于检测调度信道占用请求信号发送的下行控制信道,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
接收模块,用于根据检测结果接收信道占用请求信号。
具体可以参见请求信号的接收方法及UE的实施。
为了描述的方便,以上所述装置的各部分以功能分为各种模块或单元分别描述。当然,在实施本发明时可以把各模块或单元的功能在同一个或多个软件或硬件中实现。
综上所述,在本发明实施例提供的技术方案中,提供的方案包括:
发送基于信道占用请求信号专属的RNTI的PDCCH调度的信道占用请求信号。
DIC包含部分或者全部以下字段:送信道占用请求信号时所采用的beam信息如beam ID或者1比特的信道占用请求信号指示信息;及其终端反馈允许信道占用信号相关的信息:如反馈允许信道占用信号采用的LBT机制;反馈允许信道被占用的信号的传输资源相关的信息。
将PDCCH search space中PDCCH candidates个数限制为1。
在PDCCH之前发送UE specific的序列:
a)DMRS增强,其中DMRS是PDCCH对应DMRS的函数;
b)WUS子集其RE mapping是对应UE PDCCH传输频域资源的函数。
克服了现有技术没有这方面设计的缺陷,同时应用上述技术方案可以实现eNB信道占用请求信号发送,且可以做到最低耗电。
本领域内的技术人员应明白,本发明的实施例可提供为方法、系统、或计算机程序产品。因此,本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他 可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例,但本领域内的技术人员一旦得知了基本创造性概念,则可对这些实施例作出另外的变更和修改。所以,所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然,本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样,倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。

Claims (52)

  1. 一种请求信号的发送方法,其特征在于,包括:
    基站确定需发送的信道占用请求信号,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
    基站在下行控制信道上调度所述信道占用请求信号的发送。
  2. 如权利要求1所述的方法,其特征在于,在下行控制信道上调度时,下行控制信道上对应的控制信息是用所述信道占用请求信号专属的无线网络临时识别RNTI进行加扰的。
  3. 如权利要求2所述的方法,其特征在于,所述专属的RNTI是与跟踪区域标识TA ID或者唤醒信号区域标识WUS area ID相关联的。
  4. 如权利要求2所述的方法,其特征在于,进一步包括:
    在发送RNTI加扰的所述控制信息之前,传输一个用户专属UE specific的序列或传输一个小区专属Cell specific的序列。
  5. 如权利要求4所述的方法,其特征在于,UE specific的序列为UE specific的参考信号;或,
    UE specific的序列为WUS信号的一部分。
  6. 如权利要求5所述的方法,其特征在于,所述参考信号是发送信道占用请求信号的信道对应的物理下行控制信道PDCCH上采用的解调参考信号DMRS信号的函数。
  7. 如权利要求6所述的方法,其特征在于,所述参考信号是DMRS信号的函数,包括:所述参考信号与DMRS信号的模式pattern保持一致;或,所述参考信号是DMRS信号在时频域的重复;或,所述参考信号重用DMRS信号。
  8. 如权利要求5所述的方法,其特征在于,UE specific的序列为WUS信号的一部分,包括:
    UE specific的序列为WUS序列中与连接态RRC RRC_Connected对应的子集。
  9. 如权利要求8所述的方法,其特征在于,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
    所述UE specific序列的频域传输资源是所述UE对应的PDCCH频域传输资源的函数;或,
    所述UE specific序列占据全带宽发送;或,
    所述UE specific序列采用交织interlace方式发送。
  10. 如权利要求1所述的方法,其特征在于,下行控制信道是PDCCH;
    发送所述控制信息的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
  11. 如权利要求1所述的方法,其特征在于,所述控制信息包括以下信息之一或者其组合:
    LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道占用信号相关的信息。
  12. 如权利要求11所述的方法,其特征在于,所述与终端反馈允许信道占用信号相关的信息,包括以下信息之一或者其组合:
    反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
  13. 一种请求信号的接收方法,其特征在于,包括:
    终端检测调度信道占用请求信号发送的下行控制信道,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
    终端根据检测结果接收信道占用请求信号。
  14. 如权利要求13所述的方法,其特征在于,在下行控制信道上调度时,下行控制信道上对应的控制信息是用所述信道占用请求信号专属的无线网络临时识别RNTI进行加扰的。
  15. 如权利要求14所述的方法,其特征在于,所述专属的RNTI是与TA ID或者WUS area ID相关联的。
  16. 如权利要求14所述的方法,其特征在于,进一步包括:
    在检测RNTI加扰的所述控制信息之前,检测UE specific的序列或检测Cell specific的序列。
  17. 如权利要求16所述的方法,其特征在于,UE specific的序列为UE specific的参考信号;或,
    UE specific的序列为WUS信号的一部分。
  18. 如权利要求17所述的方法,其特征在于,所述参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
  19. 如权利要求18所述的方法,其特征在于,所述参考信号是DMRS信号的函数,包括:
    所述参考信号与DMRS信号的pattern保持一致;或,所述参考信号是DMRS信号在时频域的重复;或,所述参考信号重用DMRS信号。
  20. 如权利要求17所述的方法,其特征在于,UE specific的序列为WUS信号的一部分,包括:
    UE specific的序列为WUS序列中与RRC_Connected对应的子集。
  21. 如权利要求20所述的方法,其特征在于,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
    所述UE specific序列的频域传输资源是所述UE对应的PDCCH频域传输资源的函数;或,
    所述UE specific序列占据全带宽发送;或,
    所述UE specific序列采用interlace方式发送。
  22. 如权利要求13所述的方法,其特征在于,终端是根据静态或半静态配置search space检测调度信道占用请求信号发送的下行控制信道的。
  23. 如权利要求22所述的方法,其特征在于,下行控制信道是PDCCH;
    检测的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
  24. 如权利要求13所述的方法,其特征在于,所述控制信息包括以下信息之一或者其组合:
    LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道占用信号相关的信息。
  25. 如权利要求24所述的方法,其特征在于,所述与终端反馈允许信道占用信号相关的信息,包括以下信息之一或者其组合:
    反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
  26. 一种基站,其特征在于,包括:
    处理器,用于读取存储器中的程序,执行下列过程:
    确定需发送的信道占用请求信号,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
    收发机,用于在处理器的控制下接收和发送数据,执行下列过程:
    在下行控制信道上调度所述信道占用请求信号的发送。
  27. 如权利要求26所述的基站,其特征在于,在下行控制信道上调度时,下行控制信道上对应的控制信息是用所述信道占用请求信号专属的无线网络临时识别RNTI进行加扰的。
  28. 如权利要求27所述的基站,其特征在于,所述专属的RNTI是与TA ID或者WUS area ID相关联的。
  29. 如权利要求27所述的基站,其特征在于,进一步包括:
    在发送RNTI加扰的所述控制信息之前,传输一个UE specific的序列或传输一个Cell  specific的序列。
  30. 如权利要求29所述的基站,其特征在于,UE specific的序列为UE specific的参考信号;或,
    UE specific的序列为WUS信号的一部分。
  31. 如权利要求30所述的基站,其特征在于,所述参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
  32. 如权利要求31所述的基站,其特征在于,所述参考信号是DMRS信号的函数,包括:
    所述参考信号与DMRS信号的pattern保持一致;或,所述参考信号是DMRS信号在时频域的重复;或,所述参考信号重用DMRS信号。
  33. 如权利要求30所述的基站,其特征在于,UE specific的序列为WUS信号的一部分,包括:
    UE specific的序列为WUS序列中与RRC_Connected对应的子集。
  34. 如权利要求33所述的基站,其特征在于,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
    所述UE specific序列的频域传输资源是所述UE对应的PDCCH频域传输资源的函数;或,
    所述UE specific序列占据全带宽发送;或,
    所述UE specific序列采用interlace方式发送。
  35. 如权利要求26所述的基站,其特征在于,下行控制信道是PDCCH;
    发送所述控制信息的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
  36. 如权利要求26所述的基站,其特征在于,所述控制信息包括以下信息之一或者其组合:
    LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道占用信号相关的信息。
  37. 如权利要求36所述的基站,其特征在于,所述与终端反馈允许信道占用信号相关的信息,包括以下信息之一或者其组合:
    反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
  38. 一种用户设备,其特征在于,包括:
    处理器,用于读取存储器中的程序,执行下列过程:
    检测调度信道占用请求信号发送的下行控制信道,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
    收发机,用于在处理器的控制下接收和发送数据,执行下列过程:
    根据检测结果接收信道占用请求信号。
  39. 如权利要求38所述的用户设备,其特征在于,在下行控制信道上调度时,下行控制信道上对应的控制信息是用所述信道占用请求信号专属的无线网络临时识别RNTI进行加扰的。
  40. 如权利要求39所述的用户设备,其特征在于,所述专属的RNTI是与TA ID或者WUS area ID相关联的。
  41. 如权利要求39所述的用户设备,其特征在于,进一步包括:
    在检测RNTI加扰的所述控制信息之前,检测UE specific的序列或检测Cell specific的序列。
  42. 如权利要求41所述的用户设备,其特征在于,UE specific的序列为UE specific的参考信号;或,
    UE specific的序列为WUS信号的一部分。
  43. 如权利要求42所述的用户设备,其特征在于,所述参考信号是发送信道占用请求信号的信道对应的PDCCH上采用的DMRS信号的函数。
  44. 如权利要求43所述的用户设备,其特征在于,所述参考信号是DMRS信号的函数,包括:
    所述参考信号与DMRS信号的pattern保持一致;或,所述参考信号是DMRS信号在时频域的重复;或,所述参考信号重用DMRS信号。
  45. 如权利要求43所述的用户设备,其特征在于,UE specific的序列为WUS信号的一部分,包括:
    UE specific的序列为WUS序列中与RRC_Connected对应的子集。
  46. 如权利要求43所述的用户设备,其特征在于,进一步包括以下对UE specific序列频域映射的处理之一或者其组合:
    所述UE specific序列的频域传输资源是所述UE对应的PDCCH频域传输资源的函数;或,
    所述UE specific序列占据全带宽发送;或,
    所述UE specific序列采用interlace方式发送。
  47. 如权利要求38所述的用户设备,其特征在于,根据静态或半静态配置search space检测调度信道占用请求信号发送的下行控制信道的。
  48. 如权利要求47所述的用户设备,其特征在于,下行控制信道是PDCCH;
    检测的PDCCH的PDCCH search space中的PDCCH candidates个数是固定值。
  49. 如权利要求38所述的用户设备,其特征在于,所述控制信息包括以下信息之一或者其组合:
    LBT成功的beam信息、1比特的信道占用请求信号指示信息、与终端反馈允许信道占用信号相关的信息。
  50. 如权利要求49所述的用户设备,其特征在于,所述与终端反馈允许信道占用信号相关的信息,包括以下信息之一或者其组合:
    反馈允许信道被占用的信号的频域信息、反馈允许信道被占用的信号的时域信息、反馈允许信道占用信号采用的LBT相关信息、分配给UE反馈允许信道被占用的信号的传输的interlace信息。
  51. 一种请求信号的发送装置,其特征在于,包括:
    确定模块,用于确定需发送的信道占用请求信号,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
    发送模块,用于在下行控制信道上调度所述信道占用请求信号的发送。
  52. 一种请求信号的接收装置,其特征在于,包括:
    检测模块,用于检测调度信道占用请求信号发送的下行控制信道,所述信道占用请求信号是基站在至少一个波束beam对应的方向上执行对话前监听LBT操作后,向终端请求进行信道占用的请求信号;
    接收模块,用于根据检测结果接收信道占用请求信号。
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CN110581754A (zh) 2019-12-17
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US20210259015A1 (en) 2021-08-19
US11665738B2 (en) 2023-05-30
EP3806371B1 (en) 2025-04-09
CN110581754B (zh) 2021-05-11

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