WO2019029657A1 - Procédé de détection de canal de commande de liaison descendante, dispositif terminal et dispositif réseau - Google Patents

Procédé de détection de canal de commande de liaison descendante, dispositif terminal et dispositif réseau Download PDF

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Publication number
WO2019029657A1
WO2019029657A1 PCT/CN2018/099807 CN2018099807W WO2019029657A1 WO 2019029657 A1 WO2019029657 A1 WO 2019029657A1 CN 2018099807 W CN2018099807 W CN 2018099807W WO 2019029657 A1 WO2019029657 A1 WO 2019029657A1
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WIPO (PCT)
Prior art keywords
downlink control
control channel
candidate
candidate downlink
sets
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PCT/CN2018/099807
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English (en)
Chinese (zh)
Inventor
夏金环
吕永霞
张磊
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华为技术有限公司
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Publication of WO2019029657A1 publication Critical patent/WO2019029657A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0039—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver other detection of signalling, e.g. detection of TFCI explicit signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present application relates to the field of wireless communication technologies, and in particular, to a method, a terminal device, and a network device for detecting a downlink control channel.
  • ultra-reliable low latency communication URLLC
  • NR new-generation wireless access
  • URLLC ultra-reliable low latency communication
  • the reliability puts high demands on it.
  • the complexity of transmission or detection can be reduced, but this may make reliability unguaranteed.
  • a robust manner is adopted, which in turn leads to an increase in the detection complexity of the receiving end, which makes it difficult to achieve a short delay.
  • the design of the physical downlink control channel (PDCCH) in the 5G communication system is only for the evolved mobile broadband (eMBB) service, and there is no special consideration for the URLLC service.
  • the prototype of the physical downlink control channel is that the network device configures the terminal device with a control resource set (CORESET), and the CORESET occupies 1, 2 or 3 OFDM symbols in the time domain, and the frequency domain
  • the number of PRBs included is 6, 12 or 24, and so on.
  • the downlink control channel is transmitted within the CORESET.
  • a network device configures a CORESET in each subframe.
  • the network device configures the transmission starting point of the downlink control channel and the maximum number of transmission times of the downlink control channel to the terminal device through the high layer signaling.
  • the high-level signaling is not sent frequently.
  • the number of times the network device actually sends the downlink control channel does not necessarily reach the configured maximum number of transmissions, but the maximum number of transmissions is less than (or equal to) between the two transmission starting points.
  • Interval The terminal device detects all possible transmission of the downlink control channel at intervals between the two transmission starting points until all locations are tried or the downlink control channel is detected.
  • the network device can improve the reliability of data transmission by repeatedly transmitting, but since the network device configures the transmission starting point of the downlink control channel, and between the two transmission starting points, even if a new downlink control channel needs to be sent It can't be sent. It needs to wait until the next sending start point to send. It can't meet the requirement of low latency for URLLC service.
  • the present application provides a method and apparatus for detecting a downlink control channel, which can reduce the delay while achieving high reliability transmission of the downlink control channel.
  • the first aspect provides a method for detecting a downlink control channel, where: the terminal device receives M candidate downlink control channel sets, where M>1 and M are integers; and the terminal device uses the M candidate control channel sets as M repetitions.
  • Sending a set of candidate downlink control channels detecting a first downlink control channel; the terminal device receiving N sets of candidate downlink control channels, N ⁇ 1 and N being an integer; the terminal device sets L of the M candidate downlink control channel sets
  • the terminal device sends the L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P repeated transmissions.
  • the candidate downlink control channel set, the detecting the second downlink control channel includes: when the first downlink control channel is not detected, the terminal device sets the L candidate downlink control channel sets in the M candidate downlink control channel sets The N candidate downlink control channel sets are used as P candidate transmission downlink control channel sets, and the second downlink control channel is detected.
  • the terminal device sends the L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P repeated transmissions.
  • the L candidate downlink control channel sets are the MLth to Mth candidate control channel sets in the M candidate control channel sets .
  • each of the M candidate downlink control channel sets and the N candidate downlink control channel sets are located in a corresponding control resource set, where the M And the control resource set corresponding to the set of the N candidate downlink control channels is a first control resource set; or the M candidate downlink control channel set and the N candidate downlink control channel set respectively
  • the control resource set includes a first control resource set and a second control resource set.
  • the set of control resource groups corresponding to the set of M candidate downlink control channels and the set of N candidate downlink control channels are respectively carried on different time-frequency resources.
  • each of the candidate downlink control channel sets includes at least one candidate downlink control channel.
  • the repeatedly transmitted downlink control channel has the same aggregation level and/or the same search space within the M candidate downlink control channel sets.
  • the method before the terminal device detects the candidate downlink control channel on the control resource set, the method further includes: receiving, by the terminal device, configuration information sent by the network device, where the configuration information includes the following information At least one of: indicating a set of control resources; indicating that the candidate downlink control channel needs to be repeatedly transmitted; indicating a number of repeated transmissions of the candidate downlink control channel or a maximum number of repeated transmissions; and indicating a downlink control information format corresponding to the repeated transmission of the candidate downlink control channel; An aggregation level used when the candidate downlink control channel is repeatedly transmitted; a search space used when the candidate downlink control channel is repeatedly transmitted.
  • the terminal device when the terminal device detects the candidate downlink control channel, the terminal device sends the candidate for the repeated transmission in a detection process for the downlink control channel repeatedly sent by the network device.
  • the number of times the control channel set is merged is a preset value and/or a network configuration.
  • a second aspect provides a method for transmitting a downlink control channel, where the method includes: the network device sends a first downlink control channel in the M candidate downlink control channel sets, where the M candidate downlink control channel sets are sent as M repeated transmissions.
  • a set of candidate downlink control channels M>1 and M is an integer; the network device uses the L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as candidates for P repeated transmissions.
  • the network device in the embodiment of the present application is specifically an access network device.
  • the L candidate downlink control channel sets are the (ML)th to the Mth candidate downlink control channel set in the M candidate downlink control channel sets.
  • each of the M candidate downlink control channel sets and the N candidate downlink control channel sets are located in a corresponding control resource set, where the M And the control resource set corresponding to the set of the N candidate downlink control channels is a first control resource set; or the M candidate downlink control channel set and the N candidate downlink control channel set respectively
  • the control resource set includes a first control resource set and a second control resource set.
  • the set of control resource groups corresponding to the set of the M candidate downlink control channels and the set of the N candidate downlink control channels are respectively carried on different time-frequency resources.
  • each candidate downlink control channel set includes at least one candidate downlink control channel.
  • the repeatedly transmitted downlink control channel has the same aggregation level and/or the same search space within the M candidate downlink control channel sets.
  • the method before the network device sends the downlink control channel in the M candidate downlink control channel sets, the method further includes: the network device sending configuration information, configuration information, to the terminal device Include at least one of the following information: indicating a first control resource set and/or the second control resource set; indicating that the candidate downlink control channel needs to be repeatedly transmitted; indicating a number of repeated transmissions of the candidate downlink control channel or a maximum number of repeated transmissions; Indicates a downlink control information format corresponding to the repeated transmission of the candidate downlink control channel; an aggregation level used when the candidate downlink control channel is repeatedly transmitted; and a search space used when the candidate downlink control channel is repeatedly transmitted.
  • a terminal device having the function of implementing the terminal device in the method design of the above first aspect.
  • These functions can be implemented in hardware or in software by executing the corresponding software.
  • the hardware or software includes one or more units corresponding to the functions described above.
  • a network device having the function of implementing the network device in the method design of the second aspect above.
  • These functions can be implemented in hardware or in software by executing the corresponding software.
  • the hardware or software includes one or more units corresponding to the functions described above.
  • a terminal device including a transceiver, a processor, and a memory.
  • the processor is for controlling transceiver transceiver signals for storing a computer program for calling and running the computer program from the memory such that the terminal device performs the method of the first aspect above.
  • a network device including a transceiver, a processor, and a memory.
  • the processor is for controlling transceiver transceiver signals for storing a computer program for calling and running the computer program from memory such that the network device performs the method of the second aspect.
  • a communication device may be a terminal device in the above method design, or a chip disposed in the terminal device.
  • the communication device includes a memory for storing computer executable program code, a communication interface, and a processor coupled to the memory and the communication interface.
  • the program code stored in the memory includes instructions which, when executed by the processor, cause the communication device to perform the method performed by the terminal device in any of the possible aspects of the first aspect or the second aspect described above.
  • a communication device may be a network device in the above method design, or a chip disposed in the network device.
  • the communication device includes a memory for storing computer executable program code, a communication interface, and a processor coupled to the memory and the communication interface.
  • the program code stored in the memory includes instructions that, when executed by the processor, cause the communication device to perform the method performed by the network device in any of the possible aspects of the first aspect or the second aspect described above.
  • a computer program product comprising: computer program code, when the computer program code is run on a computer, causing the computer to perform the method of the above aspects.
  • a computer readable medium storing program code for causing a computer to perform the method of the above aspects when the computer program code is run on a computer.
  • a chip comprising a processor and a memory for storing a computer program for calling and running the computer program from a memory, the computer program for implementing the method of the above aspects .
  • the network device when the network device sends the downlink control channel to the terminal device, it may not be limited by the starting point of the sending, or may start another downlink control channel during the process of repeatedly transmitting one downlink control channel. Repeatedly sent. Therefore, for the terminal device, when detecting the downlink control channel, any one of the received downlink control channels can be detected as a downlink control channel that is repeatedly transmitted. Of course, the received downlink control channel can also be used as a first The downlink control channel transmitted is detected. With such a transmission mechanism, the downlink control channel can be repeatedly transmitted to ensure high reliability while reducing the delay.
  • FIG. 1 is a schematic diagram of a wireless communication system suitable for use in an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a downlink control channel.
  • 3 is a schematic diagram of transmitting a downlink control channel.
  • FIG. 4 is an interaction diagram of a method for detecting a downlink control channel according to an embodiment of the present application.
  • Figure 5 shows a mapping of CORESET in the time domain.
  • Figure 6 shows another way to map CORESET in the time domain.
  • Figure 7 is a schematic diagram of two CORESET frequency division multiplexing.
  • Figure 8 is a schematic diagram of two CORESET time division multiplexing.
  • Figure 9 is a schematic diagram of two CORESET time division multiplexing and frequency division multiplexing.
  • FIG. 10 is an example of a terminal device blindly detecting a PDCCH.
  • FIG. 11 is a schematic block diagram of a terminal device 500 according to an embodiment of the present application.
  • FIG. 12 is a schematic block diagram of a terminal network device 600 according to an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a terminal device 700 according to an embodiment of the present application.
  • FIG. 14 is a schematic block diagram of a network device 800 according to an embodiment of the present application.
  • the wireless communication system can include at least one network device in communication with one or more terminal devices (e.g., terminal device #1 and terminal device #2).
  • the network device may be a base station, or may be a device integrated with a base station controller, or may be another device having similar communication functions.
  • the wireless communication system mentioned in the embodiments of the present application includes, but is not limited to, a narrow band-internet of things (NB-IoT), a global system for mobile communications (GSM), and an enhanced data rate.
  • GSM evolution EDGE
  • WCDMA wideband code division multiple access
  • CDMA code division multiple access
  • TD-SCDMA time division synchronization code Time division-synchronization code division multiple access
  • LTE long term evolution
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for Microwave access
  • WiMAX future 5th generation
  • 5G future 5th generation
  • NR new radio
  • the terminal device in the embodiment of the present application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or User device.
  • the terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), with wireless communication.
  • PLMNs public land mobile networks
  • the network device in the embodiment of the present application may be a device for communicating with a terminal device, where the network device may be a global mobile communication GSM system or a base transceiver station (BTS) in CDMA, or may be a base station in a WCDMA system.
  • GSM global mobile communication
  • BTS base transceiver station
  • nodeB which may also be an evolved base station (evolutional node B, eNB or eNodeB) in the LTE system, or a wireless controller in a cloud radio access network (CRAN) scenario, or
  • the network device may be a relay station, a transmit and receive point (TRP), an access point, an in-vehicle device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN network.
  • TRP transmit and receive point
  • the application is not limited.
  • the design of the downlink control channel currently under discussion is only for the eMBB service, and there is no special consideration for the URLLC service.
  • the prototype of the downlink control channel is that the network device configures the terminal device with a control resource set (CORESET), and the control resource set includes the time domain resource and the frequency domain resource.
  • the time domain includes 1, 2 or 3 OFDM symbols.
  • the number of PRBs included in the frequency domain is 6, 12, 24, and so on.
  • the downlink control channel is transmitted within the CORESET.
  • CORESET is typically configured periodically, for example, once per time slot.
  • the network device also configures the period in which the UE detects the PDCCH.
  • the configuration period of the CORESET is the period in which the UE detects the PDCCH.
  • the network device may configure the UE to detect the downlink control channel on a part of the CORESET position, that is, the period in which the UE detects the PDCCH is greater than the configured period of the CORESET.
  • FIG. 2 is a schematic diagram of a downlink control channel.
  • CORESET occurs once per time slot, where CORESET occupies 2 OFDM symbols in the time domain, namely OFDM Symbol (recorded as OS), occupying 6 PRBs in the frequency domain.
  • One solution is to configure a CORESET that transmits the downlink control channel in each subframe.
  • the network device configures the transmission starting point of the downlink control channel and the maximum number of transmission times of the downlink control channel to the terminal device through the high layer signaling.
  • the maximum number of times the high-level signaling configuration is sent is 16 times, and the network device can only send one time, or two times, or four times, or eight times, or 16 times when actually transmitting the downlink control channel.
  • FIG. 3 is a schematic diagram of transmitting a downlink control channel.
  • the downlink control channel is repeatedly transmitted between two transmission starting points, that is, if new downlink control information needs to be sent, it can only be sent until the next transmission starting point starts.
  • the maximum number of transmissions configured by the network device is equal to 8, and if it is sent only once when actually transmitting, there are 8 locations for transmission. If sent 2 times, there are 4 locations sent. If sent 4 times, there are 2 locations sent. If sent 8 times, there is only one sent location. These locations constitute a candidate location for the network device to transmit the PDCCH. The UE needs to attempt to detect the downlink control channel at these locations until all locations are tried or until the downlink control channel is detected.
  • the upper layer configures the transmission starting point for transmitting the downlink control channel, the maximum number of repeated transmissions is less than the interval between the two transmission starting points. Between the two transmission starting points, even if new downlink control information needs to be sent, it cannot be sent, and can only be sent until the next transmission starting point starts. The low latency requirement for URLLC cannot be met.
  • the embodiment of the present application provides a method for detecting a downlink control channel, which can reduce the delay while ensuring the high reliability requirement of the URLLC.
  • the method 100 for detecting a downlink control channel provided by the present application is described below.
  • FIG. 4 is an interaction diagram of a method for detecting a downlink control channel according to an embodiment of the present application.
  • the access network device sends the first downlink control channel in the M candidate downlink control channel sets.
  • the terminal device receives the M candidate downlink control channel sets sent by the access network device.
  • the terminal device uses the M candidate downlink control channel sets as the M candidate transmission downlink control channel sets to detect the first downlink control channel.
  • the access network device sends the second downlink control channel in the N candidate downlink control channel sets, and the terminal device receives the N candidate downlink control channels sent by the access network device.
  • the terminal device uses the L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P candidate transmission downlink control channel sets to detect the second downlink control channel.
  • the access network device in order to meet the requirements of the URLLC scenario for high reliability and low latency, the access network device continues to adopt the method of repeated transmission to ensure high reliability of downlink control channel reception. At the same time, in order to reduce the delay, the access network device sends the downlink control channel and does not set the transmission starting point. In other words, the access network device may also start the transmission of another downlink control channel in the process of repeatedly transmitting one downlink control channel.
  • the terminal device does not know whether the currently received candidate downlink control channel is a repeatedly transmitted downlink control channel or the first access network device when detecting the candidate downlink control channel.
  • the downlink control channel sent.
  • the process of detecting the downlink control channel is different from the existing solution.
  • the terminal device receives the M candidate downlink control channel sets. At this time, the terminal device sets the M candidate downlink control channel sets as the M downlink transmission channel sets that are repeatedly transmitted, and detects the first downlink control channel set.
  • the terminal device since the terminal device does not know whether the M candidate downlink control channel sets are all used to repeatedly transmit a downlink control channel, or the M candidate downlink control channel sets are repeatedly transmitted in a downlink control channel, The first transmission and the subsequent repeated transmission of another downlink control channel are included. Therefore, the terminal device first considers the set of candidate downlink control channels to be regarded as a set of candidate downlink control channels that are repeatedly transmitted, and detects the first downlink control channel.
  • the M candidate downlink control channel sets are used for repeated transmission of the first downlink control channel. Then, if the terminal device receives the N candidate downlink control channels, the terminal device can use the N candidate downlink control channel sets as the N repeated transmission candidate downlink control channels to detect the second downlink control channel.
  • the terminal device If the first downlink control channel is not detected, the terminal device considers that the M candidate downlink control channel set may include a downlink control channel different from the first downlink control channel that the access network device starts to repeatedly transmit, so the detection error. Therefore, after the terminal device slides back a receiving window, the second downlink control channel is re-detected.
  • the size of the sliding receiving window may be configured on a predefined or network side.
  • each time slot of the terminal serves as a detection opportunity, and the terminal device receives and detects the candidate downlink control channel set at each detection opportunity.
  • the size of the sliding window is 1 time slot, and the receiving window needs to slide to the sliding window. The next candidate downlink control channel is detected on the opportunity.
  • the M/2 detection opportunities or the M detection opportunities may be slid at a time when the receiving window slides.
  • the receiving window size of the terminal is related to the number of times the access network device repeatedly sends the downlink control channel.
  • the terminal receives the downlink control channel repeatedly sent by the access network device in a receiving window and performs combined detection.
  • the size of the receiving window may also be predefined. Or configured on the network side.
  • the receive window may be the time taken by the M/4 or M/2 or M times of the downlink control channel set repeatedly transmitted.
  • the candidate downlink control channel set is a transmission location that may be used when the access network device sends the downlink control channel.
  • the access device sends the downlink control channel, it can be sent by using any one of the search spaces. Any one of the locations is called a candidate downlink control channel or a candidate location for transmitting the downlink control channel.
  • the terminal device does not know at which candidate location the access network device transmits before correctly detecting the downlink control channel. Therefore, the terminal device needs to receive the entire candidate downlink control channel set, and then try to detect at each candidate location of the search space. Downlink control channel.
  • the access network device After the access network device selects the candidate location, it only needs to send the downlink control channel sent at the candidate location to the terminal device, and does not need to use the entire candidate downlink control channel set to send the downlink control channel, or does not need to provide the terminal device. Send the entire set of candidate downlink control channels.
  • the access network device may send two or more downlink control channels on multiple candidate locations in the candidate downlink control channel set, where the two or more downlink control channels are respectively mapped in different The candidate downlink control channel is located.
  • the second downlink control channel may be sent during the sending of the first downlink control channel, and the first downlink control channel is different from the second downlink.
  • the control channels are respectively mapped to different candidate downlink control channel positions in the candidate downlink control channel set.
  • the downlink control channel in the 5G system is sent on the control resource set (ie, CORESET). Therefore, the embodiment of the present application has various specific implementation manners.
  • Each of the M candidate downlink control channel sets and the N candidate downlink control channel sets sent by the access network device are located in a corresponding control resource set.
  • the M candidate downlink control channel set and the control resource set corresponding to the N candidate downlink control channel sets are all a first control resource set. That is to say, the access network device sends the M candidate downlink control channels and the N candidate downlink control channels through the same configured control resource set.
  • each of the M candidate downlink control channel sets and the control resource set corresponding to the N candidate downlink control channel sets are located in the corresponding control resource set, including the first control resource set and the second control resource set.
  • the access network device may send the M candidate downlink control channels and the N candidate downlink control channels by using at least two different configured control resource sets.
  • the M candidate downlink control channel sets may be located in the same control resource set, or may be located in at least two different control resource sets.
  • the set of N candidate downlink control channels may be located in the same control resource set, or may be located in at least two different control resource sets.
  • Each control resource set belongs to a control resource set configuration. Different sets of control resources belong to different control resource set configurations.
  • the configuration of the control resource set includes the control resource set occupying several symbols in time, the number of resources in the frequency domain and the location on the frequency band, the period in which the control resource set appears, and the control resource set.
  • the subcarrier spacing, the format of the downlink control information to be transmitted, the aggregation level used by the downlink control channel, the number of search spaces of the downlink control channel, the demodulation reference signal of the control resource set, and the power allocation parameters Therefore, it can be said that the two control resource sets can be distinguished from each other by different configurations. For example, if there is one parameter difference between the two configurations, it can be said that two control resource sets are respectively configured.
  • the terminal device may receive configuration information sent by the access network device, where the configuration information includes at least one of the following information:
  • a search space used when the candidate downlink control channel is repeatedly transmitted.
  • the access network device may send configuration information to the terminal device by using the high layer signaling before sending the downlink control channel, where the configuration information may include at least one of the foregoing information.
  • the above information can be pre-configured through the access network device.
  • the access network may further indicate, in the configuration information, that the terminal device detects the downlink control channel by using the behavior of detecting the downlink control channel described in steps 110-140 above. That is to say, the behavior of the terminal device blindly detecting the PDCCH is configurable. The terminal device can also detect the PDCCH by using other detection behaviors. For example, assume that the first repeated transmission of the downlink control channel occurs only on some specific CORESETs, and these "specific CORESETs" can also be configured by the network side.
  • the access network device indicates the number of repeated transmissions or the maximum repeated transmission (hereinafter referred to as Q) in the configuration information
  • the above M may be equal to Q or less than Q, where Q is an integer.
  • the combined detection may be performed when the received candidate downlink control channel set reaches the number of repeated transmissions or the maximum number of repeated transmissions configured on the network side.
  • the aggregation level and the search space used by the downlink control channel may be configured by the access network device to the terminal device.
  • the access network device configures the terminal device for blind detection with aggregation levels of 4, 8, and 16.
  • the corresponding search space is SS4_1, SS4_2.
  • the corresponding search space is SS8_1, SS8_2, etc.
  • the corresponding search space is SS16_1, SS16_2.
  • the terminal detects the downlink control channel in the search spaces SS4_1, SS4_2, SS8_1, SS8_2 and SS16_1, SS16_2 on each CORESET until it is detected once in all search spaces, or until the downlink control channel to be detected is detected.
  • the CORESET is configured by the access device to the terminal device.
  • the configured CORESET is periodically generated. For example, each time slot occurs once, when the duration of the CORESET is less than one time slot,
  • the configured CORESET is discontinuous in time; the configured CORESET can also be one symbol per symbol and the CORESET duration in time is a symbol such that the configured CORESET is continuous in time.
  • the downlink control channel is mapped on the CORESET and the time-frequency resources other than the CORESET.
  • the time-frequency resources other than the CORESET are other time-frequency resources on the same system carrier as the CORESET.
  • Figure 5 is a mapping of CORESET in the time domain. As shown in FIG. 5, CORESET is discontinuous in the time domain, for example, every 2 OFDM symbols.
  • the access network device can perform repeated transmission of the downlink control channel on the time domain symbol between two consecutive CORESETs. That is to say, the downlink control channel is not all sent on the CORESET. After the access network device starts transmitting a downlink control channel on a CORESET, the downlink control can be performed on the available downlink time domain symbols after the CORESET. Repeated transmission of the channel.
  • the access network device can complete the repeated transmission of the downlink control channel before the next CORESET occurs. . It can be seen that the repeated transmission of the PDCCH can be completed as soon as possible in a short time, which shortens the delay of detecting the PDCCH by the terminal device.
  • the available downlink time domain symbols between consecutive two CORESETs are insufficient to map the number of repeated transmissions of the PDCCH. Then, at this time, the number of repeated transmissions of the PDCCH may also be mapped on the next occurrence of the CORESET. Similarly, in this case, the repeated transmission of the PDCCH can also be completed as soon as possible, shortening the delay in which the terminal device obtains the detected PDCCH.
  • the two consecutive CORESETs described herein may belong to the same CORESET configuration or may belong to different CORESET configurations.
  • it refers to two CORESET resources that appear in the CORESET cycle.
  • the downlink control channel is only mapped on the CORESET.
  • CORESET can be continuous or discontinuous in the time domain.
  • the repeated transmission of the PDCCH may be mapped only on the CORESET, and the available time domain symbols between every two CORESETs may be assigned to other terminal devices. That is, for one terminal device, the repeated transmission of the PDCCH is only mapped to the CORESET configured by the access network device for the terminal device, and the time domain resources between the two adjacent CORESETs in the time domain are allocated to other terminal devices. Used to send a downlink control channel. This can reduce the probability of the access network device transmitting the downlink control channel to other terminal devices.
  • the time domain resources in the middle of the two consecutive CORESETs may be configured to the terminal device B for transmitting the downlink to the terminal device B. Control channel. If the terminal device A occupies these time domain resources, the time domain resources cannot be allocated to the terminal device B. Therefore, the delay of the terminal device B detecting the downlink control channel increases.
  • the two consecutive CORESETs described herein may belong to the same CORESET configuration or may belong to different CORESET configurations.
  • it refers to two CORESET resources that appear in the CORESET cycle.
  • CORESET When CORESET is continuously distributed in the time domain, as shown in FIG. 6, CORESET is continuous in the time domain, for example, once per OFDM symbol.
  • the downlink control channel is mapped on consecutive CORESET resources.
  • continuous CORESET described here may belong to the same CORESET configuration, or may belong to different CORESET configurations. When belonging to the same CORESET configuration, it refers to two CORESET resources that appear in the CORESET cycle.
  • mapping modes of the CORESET described above in the time domain can be configured by the access network device to the terminal device.
  • the access network device when configuring the CORESET for a terminal device, may configure at least two types of CORESET for the terminal device, and simultaneously configure the at least two CORESETs with the same downlink control information.
  • the format is associated.
  • association of the at least two CORESETs with the same downlink control information format refers to that the control channel of the downlink control information format can be sent on the at least two CORESETs.
  • the access network device configures two types of CORESET for the terminal device A. If the two types of CORESET are respectively associated with the same downlink control information format (referred to as downlink control information format #1), then the downlink control information format #1 is carried.
  • the downlink control channel can be transmitted in these two kinds of CORESET.
  • the at least two CORESETs include the following mapping manners in the time domain: time division multiplexing, frequency division multiplexing, time division multiplexing, and frequency division multiplexing.
  • Figure 7 is a schematic diagram of two CORESET frequency division multiplexing. As shown in FIG. 7, at some point, the access network device configures two CORESETs for one terminal device. The PDCCH sent by the access network device to the terminal device is repeatedly mapped within the two CORESETs.
  • Figure 8 is a schematic diagram of two CORESET time division multiplexing. As shown in FIG. 8, the access network device configures two CORESETs for one terminal device, and the two CORESETs are time division multiplexed.
  • FIG. 9 is a schematic diagram of two CORESET time division multiplexing and frequency division multiplexing.
  • a CORESET does not include a search space used when the downlink control channel is repeatedly transmitted, it is considered that the downlink control channel repeatedly transmitted is not mapped in the CORESET.
  • mapping manner of the downlink control channel on the CORESET for example, the above-described mode 1, mode 2, and mapping modes of FIGS. 7 to 9 can be used alone.
  • the downlink control channel can be sent in the CORESET of one configuration or multiple configurations by using the mapping modes of mode 1, mode 2, and FIG. 7 to FIG.
  • the method for transmitting the downlink control channel provided by the present application and the mapping manner of the downlink control channel on the CORESET may also be used in combination.
  • the M candidate downlink control channel set and the N candidate downlink control channel sets sent by the access network may be sent in the CORESET of the same configuration or different configurations, and the downlink control channel is in these same configurations or different configurations of CORESET.
  • the mapping method on the upper one can be any one of the manners 1, 2 and 7 to 9 in the text.
  • the access network device can send any PDCCH to the terminal device on any available CORESET. Then, correspondingly, when the terminal device detects the PDCCH blindly, if the terminal device detects the PDCCH on a certain CORESET, the terminal device considers that the repeated transmission of the PDCCH may start on any one of the CORESETs. In other words, the terminal device does not know that the currently received PDCCH is the first transmission of the access network device. Therefore, in the embodiment of the present application, the terminal device adopts a blind detection manner different from the prior art scheme, and performs blind detection on the PDCCH to correctly decode the PDCCH.
  • FIG. 10 is an example of a blind detection of a PDCCH by a terminal device in an embodiment of the present application.
  • the access network device performs repeated transmission of the PDCCH on the periodically occurring CORESET configured for the terminal device. For example, the access network device starts repeated transmission of PDCCH 1 on CORESET #1, and performs the first repeated transmission of PDCCH 1 in CORESET #2 (that is, the second transmission). At the same time, the access network device starts the first transmission of PDCCH #2 on CORESET #2, and performs the second transmission of PDCCH 2 on CORESET #3. It should be noted that CORESET#1, CORESET#2 and CORESET#3 belong to the same CORESET configuration, and may also belong to different CORESET configurations. When the access network device simultaneously transmits PDCCH1 and PDCCH2 on CORESET#2, PDCCH1 and PDCCH2 are respectively mapped on different candidate PDCCH locations on CORESET#2.
  • the terminal device when the PDCCH is received on the CORESET #2, it is not known that this is the first repeated transmission of the downlink control channel repeatedly transmitted by the access network device. Therefore, the terminal device can consider that the first transmission of the currently received PDCCH can be started on any one of the CORESETs.
  • the terminal device may assume that the currently received PDCCH is the first time that the access network device performs repeated transmission. If the number of repeated transmissions N configured by the access network device is equal to four times, there are three subsequent repeated transmissions.
  • the terminal device may also assume that the received PDCCH has started repeated transmission before the currently detected CORESET, and the currently detected CORESET is one of repeated transmissions, for example, the second time, the third time, or the fourth time, etc. .
  • the terminal device decodes the detected PDCCH, depending on the specific implementation. For example, the terminal device assumes that the currently detected PDCCH is the first repeated transmission of the access network device, that is, the PDCCH is repeatedly transmitted from the currently detected CORESET, and the terminal device can separately decode the PDCCH. Alternatively, the terminal device may also perform no processing first, and when the PDCCH is received on the subsequent CORESET, the combined decoding is performed. For another example, the terminal device assumes that the currently received PDCCH is repeatedly transmitted on a CORESET before the currently detected CORESET, and the terminal device may use the currently detected PDCCH several times (for example, 1 time, 2 times). Or 3 times, etc.) detected PDCCH merge decoding or the like.
  • the process of decoding the downlink control channel is not limited in this embodiment of the present application.
  • the terminal device detects the candidate downlink control channel, how many times the merge is performed as a preset is a preset value and/or configured by the access network device.
  • a detection rule can be predefined on the network side.
  • the number of repeated transmissions configured by the access network device is denoted as N, and the access network device may define the detection rule as combining the N/4th repeated transmission and the N/2th repeated transmission as one decoding.
  • the network device when the network device sends the downlink control channel to the terminal device, the network device may not be restricted by the sending start point, or another downlink control channel may be started in the process of repeatedly transmitting a downlink control channel. Repeated delivery. Therefore, for the terminal device, when detecting the downlink control channel, any one of the received downlink control channels can be detected as a downlink control channel that is repeatedly transmitted. Of course, the received downlink control channel can also be used as a first The downlink control channel transmitted is detected. With such a transmission mechanism, the downlink control channel can be repeatedly transmitted to ensure high reliability while reducing the delay.
  • the method for detecting the downlink control channel provided by the embodiment of the present application is described in detail with reference to FIG. 1 to FIG. 10 .
  • the access network device and the terminal device in the embodiments of the present application are described below with reference to FIG. 11 to FIG. 14 .
  • FIG. 11 is a schematic block diagram of a terminal device 500 according to an embodiment of the present application. As shown in FIG. 11, the terminal device 500 includes:
  • the receiving unit 510 is configured to receive M candidate downlink control channel sets, where M>1 and M are integers;
  • the processing unit 520 is configured to use the M candidate downlink control channel sets as the M candidate transmission downlink control channel sets to detect the first downlink control channel.
  • the receiving unit 510 is further configured to receive N sets of candidate downlink control channels, where N ⁇ 1 and N is an integer;
  • the processing unit 520 is further configured to use the L candidate downlink control channel sets and the N candidate downlink control channels in the M candidate downlink control channel sets as P candidate transmission downlink control channel sets, and detect the second downlink control.
  • Channel, M>L, P L+N, L is an integer.
  • Each unit in the terminal device 500 and the foregoing other operations or functions in the embodiment of the present application are respectively configured to implement a corresponding process performed by the terminal device in the method for detecting the downlink control channel. For the sake of brevity, it will not be repeated here.
  • FIG. 12 is a schematic block diagram of an access network device 600 according to an embodiment of the present application.
  • the access network device 600 includes a processing unit 610 and a transmitting unit 620.
  • the processing unit 610 is configured to control the sending unit to perform the following steps:
  • FIG. 13 is a schematic structural diagram of a terminal device 700 according to an embodiment of the present application.
  • the terminal device 700 includes one or more processors 701, one or more memories 702, and one or more transceivers 703.
  • the processor 701 is configured to control the transceiver 703 to send and receive signals
  • the memory 702 is configured to store a computer program
  • the processor 701 is configured to call and run the computer program from the memory 702, so that the terminal device performs a method for detecting a downlink control channel.
  • the terminal device 500 shown in FIG. 11 can be implemented by the terminal device 700 shown in FIG.
  • the receiving unit 510 shown in FIG. 11 can be implemented by the transceiver 703, and the processing unit 520 can be implemented by the processor 701 or the like.
  • FIG. 14 is a schematic structural diagram of a network device 800 according to an embodiment of the present application.
  • access network device 800 includes one or more processors 801, one or more memories 802, and one or more transceivers 803.
  • the processor 801 is configured to control the transceiver 803 to send and receive signals
  • the memory 802 is configured to store a computer program
  • the processor 801 is configured to call and run the computer program from the memory 802, so that the network device performs a method for transmitting a downlink control channel.
  • the access network device 600 shown in FIG. 12 can be implemented by the access network device 800 shown in FIG.
  • the transmitting unit 610 shown in FIG. 12 can be implemented by the transceiver 803 shown in FIG. 14, and the processing unit 610 can be implemented by the processor 801.
  • the processor may be a central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more programs for controlling the program of the present application.
  • the processor can include a digital signal processor device, a microprocessor device, an analog to digital converter, a digital to analog converter, and the like.
  • the processor can distribute the control and signal processing functions of the mobile device among the devices according to their respective functions.
  • the processor can include functionality to operate one or more software programs, which can be stored in memory.
  • the functions of the processor may be implemented by hardware or by software executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the memory can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of information and instructions that can be stored. Dynamic storage device. It can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, and a disc storage (including a compact disc, a laser disc, a compact disc, a digital versatile disc, a Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or a medium that can be used to carry or store a desired program code in the form of an instruction or data structure and accessible by a computer, But it is not limited to this.
  • EEPROM electrically erasable programmable read-only memory
  • CD-ROM compact disc read-only memory
  • disc storage including a compact disc, a laser disc, a compact disc, a digital versatile disc, a Blu-ray disc, etc.
  • the foregoing memory and the memory may be physically independent units, or the memory may be integrated with the processor.
  • the present application further provides a communication system, including the terminal device and the network device described in the foregoing method embodiments.
  • the application also provides a computer program product comprising computer program code for causing a computer to perform operations and/or processes performed by a terminal device in an embodiment of the method described above when the computer program code is run on a computer .
  • the application also provides a computer program product comprising computer program code for causing a computer to perform operations and/or processes performed by a network device in an embodiment of the method described above when the computer program code is run on a computer .
  • the present application also provides a computer readable medium storing computer program code for causing a computer to perform operations performed by a terminal device in the above method embodiments when the computer program code is run on a computer / or process.
  • the present application also provides a computer readable medium storing computer program code for causing a computer to perform operations performed by a network device in the above method embodiments when the computer program code is run on a computer / or process.
  • the present application also provides a chip, including a processor and a memory, the memory for storing a computer program, the processor for calling and running the computer program from the memory to perform execution by the terminal device in the above method embodiment Operation and / or process.
  • the present application also provides a chip, including a processor and a memory, the memory for storing a computer program, the processor for calling and running the computer program from the memory to perform execution by the network device in the above method embodiment Operation and / or process.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program code. .

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Abstract

La présente invention concerne un procédé de détection de canal de commande de liaison descendante, le procédé comprenant les opérations suivantes : un dispositif terminal reçoit M ensembles de canaux de commande de liaison descendante candidats, M étant supérieur à 1 et étant un nombre entier; le dispositif terminal détecte un premier canal de commande de liaison descendante en utilisant les M ensembles de canaux de commande candidats en tant que M ensembles de canaux de commande de liaison descendante candidats transmis de manière répétée; le dispositif terminal reçoit N ensembles de canaux de commande de liaison descendante candidats, N étant supérieur ou égal à 1 et étant un nombre entier; et le dispositif terminal détecte un second canal de commande de liaison descendante en utilisant L ensembles de canaux de commande de liaison descendante candidats et les N ensembles de canaux de commande de liaison descendante candidats dans les M ensembles de canaux de commande de liaison descendante candidats en tant que P ensembles de canaux de commande de liaison descendante candidats transmis de manière répétée, M étant supérieur à L, P étant égal à L + N, et L étant un nombre entier.
PCT/CN2018/099807 2017-08-11 2018-08-10 Procédé de détection de canal de commande de liaison descendante, dispositif terminal et dispositif réseau WO2019029657A1 (fr)

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