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WO2018166226A1 - Procédé d'envoi et de réception de canal de commande de liaison descendante physique, et dispositif associé - Google Patents

Procédé d'envoi et de réception de canal de commande de liaison descendante physique, et dispositif associé Download PDF

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Publication number
WO2018166226A1
WO2018166226A1 PCT/CN2017/110562 CN2017110562W WO2018166226A1 WO 2018166226 A1 WO2018166226 A1 WO 2018166226A1 CN 2017110562 W CN2017110562 W CN 2017110562W WO 2018166226 A1 WO2018166226 A1 WO 2018166226A1
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Prior art keywords
user
resource set
user group
user equipment
control resource
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English (en)
Chinese (zh)
Inventor
王建中
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Shenzhen Jinli Communication Equipment Co Ltd
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Shenzhen Jinli Communication Equipment Co Ltd
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    • 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
    • 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 signalling, i.e. of overhead other than pilot signals
    • 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
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for transmitting and receiving a physical downlink control channel, and related devices.
  • 5G is a multi-technology convergence communication technology that meets the needs of a wide range of data and connectivity services through technology changes and innovations.
  • 3GPP 3rd Generation Partnership Project
  • SI Siemens Item
  • 5G new air interface research.
  • 3GPP mainly carries out new air interface technology from three aspects.
  • eMBB Enhanced Mobile Broadband
  • URLLC Ultra-reliable Low-latency Communications
  • mMTC Massive Machine Type Communications
  • 3GPP's current research includes initial access, channel coding, MIMO (Multiple-Input Multiple-Out-put), scheduling, and HARQ (Hybrid Automatic Repeat re Quest). Request), flexible duplexing and interference cancellation.
  • MIMO Multiple-Input Multiple-Out-put
  • HARQ Hybrid Automatic Repeat re Quest
  • the existing downlink control channel includes a common search space and a user-specific search space.
  • the user equipment scheduled by the current subframe needs to perform blind detection in the entire user-specific search space, and the number of blind detections by the user equipment is large, up to 44 times, so Brings a large system delay.
  • the embodiment of the invention provides a method for transmitting and receiving a physical downlink control channel, and a related device, which can solve the problem that the blind detection range of the user equipment in the prior art is large.
  • a first aspect of the present invention provides a method for transmitting a physical downlink control channel, including:
  • a current subframe including a physical downlink control channel PDCCH where the PDCCH includes a common control resource set and at least one user-level control resource set, where the common control resource set is used to carry user group control information;
  • the second aspect of the present invention provides a method for receiving a physical downlink control channel, including:
  • the user group control information is used to indicate user equipment included in each user group and user level control corresponding to the user group The time-frequency resource location of the resource set;
  • a third aspect of the present invention provides a base station, including:
  • a processing unit configured to generate a current subframe that includes a physical downlink control channel PDCCH, where the PDCCH includes a common control resource set and at least one user-level control resource set, where the common control resource set is used to carry user group control information;
  • the user group control information is used to indicate the user equipment included in each of the user groups and the time-frequency resource location of the user-level control resource set corresponding to the user group; the user-level control resource set is used to carry the corresponding Downlink control information of user equipment in the user group;
  • a sending unit configured to send the current subframe to the user equipment.
  • the fourth aspect of the present invention provides a user equipment, including:
  • a receiving unit configured to receive user group control information in a common control resource set of a physical downlink control channel PDCCH of a current subframe sent by the base station; the user group control information is used to indicate a user equipment included in each user group, and the user group Time-frequency resource bits of the corresponding user-level control resource set Set
  • a processing unit configured to perform blind detection on the corresponding user-level control resource set according to the indication of the user group control information to obtain downlink control information.
  • the base station first generates a current subframe including a physical downlink control channel PDCCH, where the PDCCH includes a common control resource set and at least one user-level control resource set, where the common control resource set is used to carry user group control information.
  • the user group control information is used to indicate a user equipment included in each of the user groups and a time-frequency resource location of the user-level control resource set corresponding to the user group; the user-level control resource set is used to bear the corresponding Downlink control information of the user equipment in the user group; then sending the current subframe to the user equipment, so that the user equipment can perform blind detection in the indicated user level control resource set, thereby reducing the blind detection range to reduce
  • the number of blind checks reduces system latency.
  • FIG. 1 is a schematic flowchart of a method for transmitting a physical downlink control channel according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a subframe according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of an indication of user group control information according to an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of an indication of user group control information according to another embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a user control channel aggregation level according to an embodiment of the present invention.
  • FIG. 6 is a schematic flowchart of a method for receiving a physical downlink control channel according to an embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of a control channel candidate for a control channel search space according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • a user device may refer to a device that provides a voice and/or data connection to a user.
  • the user device can be connected to a computing device such as a laptop or desktop computer, or it can be a standalone device such as a personal digital assistant (PDA).
  • PDA personal digital assistant
  • User equipment may also be referred to as systems, subscriber units, subscriber stations, mobile stations, mobile stations, remote stations, access points, remote terminals, access terminals, user terminals, user agents, or user devices.
  • User equipment can be subscriber stations, wireless devices, cellular phones, PCS phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), handheld devices with wireless connectivity Or other processing device connected to the wireless modem.
  • a base station e.g., an access point, a Node B, an evolved Node B (eNB), or a gNB
  • eNB evolved Node B
  • gNB a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface.
  • IP Internet Protocol
  • the base station can also coordinate the management of the attributes of the air interface.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a computer.
  • the computer readable medium may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device or may be used to carry or store in the form of an instruction or data structure The required program code and any other medium that can be accessed by the computer. Also, any connection is properly termed a computer-readable medium.
  • Disk and optical disks as used herein include compact disk (CD), laser disk, optical disk, digital versatile disk (DVD), floppy disk, Blu-ray disk (BD), in which the disk usually magnetically replicates data, and the disk is optically optically Copy the data. Combinations of the above should also be included in the scope of computer readable media.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SD-FDMA single carrier FDMA
  • a CDMA system may implement wireless technologies such as Universal Terrestrial Radio Access (UTRA), CDMA2000, High Speed Packet Access (HSPA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), and the like.
  • UTRA includes Wideband-CDMA (W-CDMA) and other variants of CDMA.
  • CDMA2000 covers the IS-2000, IS-95, and IS-856 standards.
  • a TDMA system can implement a wireless technology such as the Global System for Mobile Communications (GSM).
  • the OFDMA system can implement wireless technologies such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and the like.
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • Flash-OFDM Flash-OFDM
  • UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS).
  • 3GPP Long Term Evolution (LTE) is an upcoming release that uses E-UTRA, which employs OFDMA on the downlink and SC-FDMA on the uplink.
  • HSPA, HSDPA, HSUPA, UTRA, E-UTRA, UMTS, LTE, LTE-A, 5G, SAE, EPC, and GSM are described in documents from an organization named "3rd Generation Partnership Project” (3GPP).
  • CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2).
  • these wireless communication systems may additionally include a peer-to-peer (eg, mobile to mobile) ad hoc network that typically uses unpaired unlicensed spectrum, 802.xx wireless LAN, Bluetooth, and any other short-range and remote wireless communication technologies. system.
  • a peer-to-peer eg, mobile to mobile
  • FIG. 1 is a schematic flowchart of a method for transmitting a physical downlink control channel according to an embodiment of the present invention. As shown in the figure, the method in the embodiment of the present invention includes:
  • S101 Generate a current subframe that includes a physical downlink control channel PDCCH, where the PDCCH includes a common control resource set and at least one user-level control resource set, where the common control resource set is used to carry user group control information.
  • the user group control information is used to indicate a user equipment included in each user group and a time-frequency resource location of the user-level control resource set corresponding to the user group; the user-level control resource set is used to carry a corresponding Downlink control information of the user equipment in the user group.
  • the common control resource set/user level control resource set includes at least one search space, each search space includes K Control Channel Elements (CCEs), and each CCE includes a fixed number of resource element groups (Resource Element Group) ).
  • the user equipment in the user group may be determined according to the service scenario type of the user equipment scheduled in the current subframe; according to the service of the user equipment in the user group.
  • the scenario type determines the user-level control resource set corresponding to the user group.
  • the user equipments of the same service scenario type belong to the same user group.
  • the user-level control resource set corresponding to the user group may be determined according to the delay requirement and/or the reliability requirement corresponding to the service scenario type of the user equipment in the user group. In this way, different user-level control resource sets can be allocated according to different user types to ensure the user's KPI performance indicators.
  • the specifics can be mainly divided into the following categories:
  • the plurality of user-level control resource sets include at least a first user-level control resource set.
  • the first user-level control resource set occupies the first OFDM symbol of the current subframe, and if the service scenario of the user equipment in the user group is ultra-reliable low-latency communications (URLLC), Mapping downlink control information of the user equipment in the user group to the first user group control resource set to generate the current subframe. In this way, the user equipment in the URLLC scenario can start processing after receiving the first control symbol, thereby reducing the delay.
  • URLLC ultra-reliable low-latency communications
  • the second user-level control resource set includes at least a second user-level control resource set, where the second user-level control resource set occupies at least two OFDM symbols of the current subframe, if the user equipment in the user group
  • the service scenario is an enhanced mobile broadband eMBB, and mapping downlink control information of the user equipment in the user group to the second user group control resource set to generate the current subframe.
  • the user equipment in the eMBB scenario can utilize the time diversity technology, such as the gain brought by the space-time block coding (STBC) technology, to improve the accuracy of control information reception.
  • STBC space-time block coding
  • the common control resource set occupies an intermediate frequency band of a frequency domain of the first OFDM symbol of the current subframe, thereby supporting cells of different bandwidths, and reducing reconfiguration of different cells. Additionally, common control information may be mapped to the common control resource set, the common control information including at least one of a system message, a paging message, and a random access response message.
  • the PDCCH includes a common control resource set and three user-level control resource sets, and the common control resource set occupies an intermediate frequency band of a frequency domain of a first OFDM symbol of a current subframe, and the common control resource set includes a common control.
  • Information and user group control information wherein the common control information is used to carry system public messages (eg, session initiation protocol sip message, paging Paging message, system message, random access response message RAR, etc.), and user group control information is used. And indicating a user equipment included in each of the user groups and a time-frequency resource location of the user-level control resource set corresponding to the user group.
  • the three user-level control resource sets include user-level control resource set 1 (resource area 1-1, resource area 1-2, ..., resource area 1-N) occupying the first OFDM symbol of the current subframe, occupying the current User level control resource set 2 (resource area 2-1, resource area 2-2, ..., resource area 2-N) and user level control resource set 3 (resource area 3-1) of at least two OFDM symbols of a subframe
  • the resource area 3-2, ..., the resource area 3-N), the time-frequency resource positions of each resource area in the user-level control resource set are different from each other.
  • a plurality of downlink scheduling users are included in a certain subframe n, where the user equipment 1 is a URLLC user, user equipment 2 is an eMBB user, and the common control resource set includes user group 1 (user group 1 corresponding to user level control resource set 1) and user group 2 (user group 2 corresponding user level control resource set 2) Frequency resource location. Since the user equipment 1 has high delay requirements, the user equipment 1 determines the user equipment in the user group 1, and the user group 1 corresponds to the user level control resource set 1, so the downlink control information of the user equipment 1 is mapped to the user-level control resource set. 1.
  • the user equipment 1 starts processing immediately after receiving the first control symbol; because the user equipment 2 has high reliability requirements, the user equipment 2 determines the user equipment in the user group 2, and the user group 2 corresponds to the user level control resource.
  • Set 2 therefore, the downlink control information of the user equipment 2 is mapped to the user-level control resource set 2, and the gain brought by the time diversity is utilized to the greatest extent; the downlink control information of other user equipments is mapped to the user-level control resource set 3.
  • both the user equipment 1 and the user equipment 2 are URLLC user equipments. Since both the user equipment 1 and the user equipment 2 have high delay requirements, the user equipment 1 and the user equipment are 2 is determined as the user equipment in the user group 1, and the user group 1 corresponds to the user level control resource set 1. Therefore, the downlink control information of the user equipment 1 and the downlink control information of the user equipment 2 are mapped to the user level control resource set 1 to ensure that User equipment 1 and user equipment 2 begin processing as soon as the first control symbol is received.
  • control channel unit CCE occupied by the downlink control information of the user equipment in the user group may be determined, where different user equipments in the same user group occupy CCEs of different aggregation levels (AL).
  • the aggregation level is a combined form of CCEs, that is, the PDCCH is composed of L CCEs, and exemplarily, where L ⁇ ⁇ 1, 2, 4, 8, ... ⁇ , that is, the PDCCH can only include the following
  • the combined form consists of a combination of 1 CCE (1-CCE), a combination of 2 CCEs (2-CCE), a combination of 4 CCEs (4-CCE) and a combination of 8 CCEs (8-CCE).
  • L ⁇ ⁇ 1, 2, 4, 8, ... ⁇ that is, the PDCCH can only include the following
  • the combined form consists of a combination of 1 CCE (1-CCE), a combination of 2 CCEs (2-CCE), a combination of 4 CCEs (4-CCE) and a combination of 8 CCEs (8-CCE).
  • other levels of aggregation can be utilized.
  • the search space is composed of a plurality of sets of candidate control channels, and the user equipment monitors the search space, and performs blind detection in the search space according to different aggregation levels to detect the downlink control channel associated with itself.
  • the control region includes eight CCEs as an example, and the number of candidates with aggregation levels of 1, 2, 4, and 8 is 8 (candidate #0 to candidate #7) and 4 (candidate #) respectively. 8 to #11), 2 (#12 to #13) and 1 (#14).
  • the candidate design of the search space the channel estimation results can be shared by the control channels of different aggregation levels.
  • the complexity of small channel estimation For example, channel estimation may be performed only on a control channel with an aggregation level of 8, and control channels of other aggregation levels may multiplex channel estimation results of a control channel with an aggregation level of 8.
  • the aggregation level of the control channel of the user equipment 1 is 2, that is, the downlink control information of the user equipment 1 occupies 2 CCEs, for example, candidate #10.
  • the aggregation level of the control channel of the user equipment 2 is 4, that is, the downlink control information of the user equipment 2 occupies 4 CCEs, for example, the candidate #12, so that the CCE resources are allocated reasonably, and the downlink control channel resources/search spaces of the user equipment are prevented from colliding. .
  • the aggregation level of the user equipment 2 is 4, which occupies the downlink control channel of the candidate #12 (ie, CCE0 to CCE3) shown in FIG. 7, other users in the user group can only occupy CCE4 to CCE7. Resources. If the aggregation level of the user equipment 1 is also 4, the user equipment 1 occupies resources of CCE4 to CCE7, and other user equipments do not have CCEs available. If the aggregation level of the user equipment 1 is 2, and the downlink control channel occupies one of the candidates #10 and #11, and only 2 CCEs are occupied, the remaining 2 CCEs may also be available to other user equipments. Therefore, different CCEs in the same user group occupy different aggregation levels of CCEs to allocate resources reasonably, and prevent the downlink control channel of the user equipment from colliding when performing physical resource mapping.
  • the primary information block MIB may be broadcast, where the primary information block MIB includes a time-frequency resource location occupied by the common control resource set, thereby ensuring Each accessed user equipment can acquire a common control resource set.
  • a current subframe including a physical downlink control channel PDCCH is generated, where the PDCCH includes a common control resource set and at least one user-level control resource set, where the common control resource set is used to carry user group control information;
  • the user group control information is used to indicate a user equipment included in each user group and a time-frequency resource location of the user-level control resource set corresponding to the user group; the user-level control resource set is used to carry a corresponding Downlink control information of the user equipment in the user group; sending the current subframe to the user equipment, and then the user equipment may perform blind detection in the configured user-level control resource set, thereby reducing the blind detection range to reduce blind detection The number of times reduces system latency.
  • FIG. 6 is a schematic flowchart diagram of a method for receiving a physical downlink control channel according to another embodiment of the present invention. As shown in the figure, the method in the embodiment of the present invention includes:
  • S601 Receive a user group control information in a common control resource set of a physical downlink control channel PDCCH of a current subframe sent by a base station, where the user group control information is used to indicate a user equipment included in each user group and a user corresponding to the user group.
  • the time-frequency resource location of the level control resource set is used to indicate a user equipment included in each user group and a user corresponding to the user group.
  • the base station first generates a current subframe including a physical downlink control channel PDCCH, where the PDCCH includes a common control resource set and at least one user-level control resource set, where the common control resource set is used to carry user group control information;
  • the user group control information is used to indicate the user equipment included in each user group and the time-frequency resource location of the user-level control resource set corresponding to the user group; the user-level control resource set is used to carry the corresponding location. Determining downlink control information of the user equipment in the user group, and then sending the current subframe to the user equipment.
  • S602. Perform blind detection on the corresponding user-level control resource set to obtain downlink control information according to the indication of the user group control information.
  • the PDCCH includes a common control resource set and three user-level control resource sets, and the common control resource set occupies an intermediate frequency band of a frequency domain of a first OFDM symbol of a current subframe, and the common control resource set includes a common control.
  • Information and user group control information wherein the common control information is used to carry system public messages (eg, session initiation protocol sip message, paging Paging message, system message, random access response message RAR, etc.), and user group control information is used. And indicating a user equipment included in each of the user groups and a time-frequency resource location of the user-level control resource set corresponding to the user group.
  • the three user-level control resource sets include user-level control resource set 1 (resource area 1-1, resource area 1-2, ..., resource area 1-N) occupying the first OFDM symbol of the current subframe, occupying the current User level control resource set 2 (resource area 2-1, resource area 2-2, ..., resource area 2-N) and user level control resource set 3 (resource area 3-1) of at least two OFDM symbols of a subframe
  • the resource area 3-2, ..., the resource area 3-N), the time-frequency resource positions of each resource area in the user-level control resource set are different from each other.
  • a plurality of downlink scheduling users are included in a certain subframe n, where user equipment 1 is a URLLC user equipment, user equipment 2 is an eMBB user equipment, and a common control resource set includes user group 1 (user group 1 corresponds to User level control resource set 1) and user group 2 (user group 2 corresponding User level control resource set 2). Since the user equipment 1 has high delay requirements, the user equipment 1 determines the user equipment in the user group 1, and the user group 1 corresponds to the user level control resource set 1, so the downlink control information of the user equipment 1 is mapped to the user-level control resource set. 1.
  • the user equipment 1 performs blind detection on the user level control resource set 1 according to the time-frequency resource location of the user-level control resource set indicated by the user group control information to obtain downlink control information of the user equipment 1. Since the user equipment 2 has high reliability requirements, the user equipment 2 determines the user equipment in the user group 2, and the user group 2 corresponds to the user level control resource set 2, and the user equipment 2 controls the resource set according to the user level control information indicated by the user group control information. The time-frequency resource location is blindly checked at the user-level control resource set 2 to obtain downlink control information. As shown in FIG. 4, both the user equipment 1 and the user equipment 2 are URLLC user equipments.
  • both the user equipment 1 and the user equipment 2 are determined to be in the user group 1.
  • User equipment, user group 1 corresponds to the user level control resource set 1, so the base station maps the downlink control information of the user equipment 1 and the downlink control information of the user equipment 2 to the user level control resource set 1, and the user equipment 1 and the user equipment 2 according to the user
  • the time-frequency resource location of the user-level control resource set indicated by the group control information is blindly checked at the user-level control resource set 1 to obtain downlink control information.
  • blind detection of different aggregation levels may be performed from the initial time-frequency resource location of the user-level control resource set to obtain downlink control information.
  • the common control resource set and/or the user-level control resource set may be divided into multiple search spaces starting from the starting time-frequency resource location (or starting CCE), and each search space adopts the aggregation level candidate shown in FIG. The way the number is divided.
  • the user equipment performs blind detection on the common control resource set and/or the user-level control resource set, starting from the initial time-frequency resource location (or starting the CCE), the user equipment is blindly checked according to the corresponding candidate for each search space. .
  • the candidate number division manner of the aggregation level includes 15 candidates for every 8 CCEs.
  • the user equipment first performs 15 blind checks on the first 8 CCEs according to the corresponding candidate. If the relevant downlink control information is not decoded, the next search space including 8 CCEs is blindly checked until the decoding obtains relevant downlink control information or Decode all search spaces.
  • the common control resource set of the physical downlink control channel PDCCH of the current subframe sent by the base station may receive the primary information block MIB broadcast by the base station, where the primary information block MIB includes the The time-frequency resource location occupied by the public control resource set ensures that the user equipment can obtain the common control resource set.
  • FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in the figure, the base station in the embodiment of the present invention includes:
  • the processing unit 801 is configured to generate a current subframe that includes a physical downlink control channel PDCCH, where the PDCCH includes a common control resource set and at least one user-level control resource set, where the common control resource set is used to carry user group control information;
  • the user group control information is used to indicate the user equipment included in each user group and the time-frequency resource location of the user-level control resource set corresponding to the user group; the user-level control resource set is used to carry the corresponding location.
  • the downlink control information of the user equipment in the user group is configured to generate a current subframe that includes a physical downlink control channel PDCCH, where the PDCCH includes a common control resource set and at least one user-level control resource set, where the common control resource set is used to carry user group control information;
  • the user group control information is used to indicate the user equipment included in each user group and the time-frequency resource location of the user-level control resource set corresponding to the user group; the user-level control resource set is used to carry the corresponding location.
  • the common control resource set/user level control resource set includes at least one search space, each search space includes K Control Channel Elements (CCEs), and each CCE includes a fixed number of resource element groups (Resource Element Group) ).
  • the user equipment in the user group may be determined according to the service scenario type of the user equipment scheduled in the current subframe; according to the service of the user equipment in the user group.
  • the scenario type determines the user-level control resource set corresponding to the user group.
  • the user equipments of the same service scenario type belong to the same user group.
  • the user-level control resource set corresponding to the user group may be determined according to the delay requirement and/or the reliability requirement corresponding to the service scenario type of the user equipment in the user group. In this way, different user-level control resource sets can be allocated according to different user types to ensure the user's KPI performance indicators.
  • the specifics can be mainly divided into the following categories:
  • the multiple user-level control resource sets include at least a first user-level control resource set, where the first user-level control resource set occupies a first OFDM symbol of a current subframe, if the user equipment in the user group
  • the service scenario is an ultra-reliable low-latency communications (URLLC), mapping downlink control information of the user equipment in the user group to the first user group control resource set to generate the Current subframe.
  • URLLC ultra-reliable low-latency communications
  • the second user-level control resource set includes at least a second user-level control resource set, where the second user-level control resource set occupies at least two OFDM symbols of the current subframe, if the user equipment in the user group
  • the service scenario is an enhanced mobile broadband eMBB, and mapping downlink control information of the user equipment in the user group to the second user group control resource set to generate the current sub- frame.
  • the user equipment in the eMBB scenario can utilize the time diversity technology, such as the gain brought by the space-time block coding (STBC) technology, to improve the accuracy of control information reception.
  • STBC space-time block coding
  • the common control resource set occupies an intermediate frequency band of a frequency domain of the first OFDM symbol of the current subframe, thereby supporting cells of different bandwidths, and reducing reconfiguration of different cells. Additionally, common control information may be mapped to the common control resource set, the common control information including at least one of a system message, a paging message, and a random access response message.
  • the PDCCH includes a common control resource set and three user-level control resource sets, and the common control resource set occupies an intermediate frequency band of a frequency domain of a first OFDM symbol of a current subframe, and the common control resource set includes a common control.
  • Information and user group control information wherein the common control information is used to carry system public messages (eg, session initiation protocol sip message, paging Paging message, system message, random access response message RAR, etc.), and user group control information is used. And indicating a user equipment included in each of the user groups and a time-frequency resource location of the user-level control resource set corresponding to the user group.
  • the three user-level control resource sets include user-level control resource set 1 (resource area 1-1, resource area 1-2, ..., resource area 1-N) occupying the first OFDM symbol of the current subframe, occupying the current User level control resource set 2 (resource area 2-1, resource area 2-2, ..., resource area 2-N) and user level control resource set 3 (resource area 3-1) of at least two OFDM symbols of a subframe
  • the resource area 3-2, ..., the resource area 3-N), the time-frequency resource positions of each resource area in the user-level control resource set are different from each other.
  • a plurality of downlink scheduling users are included in a certain subframe n, where user equipment 1 is a URLLC user, user equipment 2 is an eMBB user, and a common control resource set includes user group 1 (user group 1 corresponds to a user level). Control the time-frequency resource location of resource set 1) and user group 2 (user group 2 corresponds to user-level control resource set 2). Since the user equipment 1 has high delay requirements, the user equipment 1 determines the user equipment in the user group 1, and the user group 1 corresponds to the user level control resource set 1, so the downlink control information of the user equipment 1 is mapped to the user-level control resource set. 1.
  • the user equipment 1 starts processing immediately after receiving the first control symbol; because the user equipment 2 has high reliability requirements, the user equipment 2 determines the user equipment in the user group 2, and the user group 2 corresponds to the user level control resource.
  • Set 2 so the downlink control information of the user equipment 2 is mapped to the user-level control resource set 2, and the gain brought by the time diversity is utilized to the greatest extent; the downlink control information of other user equipments is mapped to the user-level control resources.
  • both the user equipment 1 and the user equipment 2 are URLLC user equipments. Since both the user equipment 1 and the user equipment 2 have high delay requirements, the user equipment 1 and the user equipment are 2 is determined as the user equipment in the user group 1, and the user group 1 corresponds to the user level control resource set 1. Therefore, the downlink control information of the user equipment 1 and the downlink control information of the user equipment 2 are mapped to the user level control resource set 1 to ensure that User equipment 1 and user equipment 2 begin processing as soon as the first control symbol is received.
  • control channel unit CCE occupied by the downlink control information of the user equipment in the user group may be determined, where different user equipments in the same user group occupy CCEs of different aggregation levels (AL).
  • the aggregation level is a combined form of CCEs, that is, the PDCCH is composed of L CCEs, and exemplarily, where L ⁇ ⁇ 1, 2, 4, 8, ... ⁇ , that is, the PDCCH can only include the following
  • the combined form consists of a combination of 1 CCE (1-CCE), a combination of 2 CCEs (2-CCE), a combination of 4 CCEs (4-CCE) and a combination of 8 CCEs (8-CCE).
  • L ⁇ ⁇ 1, 2, 4, 8, ... ⁇ that is, the PDCCH can only include the following
  • the combined form consists of a combination of 1 CCE (1-CCE), a combination of 2 CCEs (2-CCE), a combination of 4 CCEs (4-CCE) and a combination of 8 CCEs (8-CCE).
  • other levels of aggregation can be utilized.
  • the search space is composed of a plurality of sets of candidate control channels, and the user equipment monitors the search space, and performs blind detection in the search space according to different aggregation levels to detect the downlink control channel associated with itself.
  • the control region includes eight CCEs as an example, and the number of candidates with aggregation levels of 1, 2, 4, and 8 is 8 (candidate #0 to candidate #7) and 4 (candidate #) respectively. 8 to #11), 2 (#12 to #13) and 1 (#14).
  • the candidate design of the search space the channel estimation results can be shared by the control channels of different aggregation levels, and the complexity of the channel estimation is reduced. For example, channel estimation may be performed only on a control channel with an aggregation level of 8, and control channels of other aggregation levels may multiplex channel estimation results of a control channel with an aggregation level of 8.
  • the aggregation level of the control channel of the user equipment 1 is 2, that is, the downlink control information of the user equipment 1 occupies 2 CCEs, for example, candidate #10.
  • the aggregation level of the control channel of the user equipment 2 is 4, that is, the downlink control information of the user equipment 2 occupies 4 CCEs, for example, the candidate #12, so that the CCE resources are allocated reasonably, and the downlink control channel resources of the user equipment are avoided. There is a conflict in the search space.
  • the aggregation level of the user equipment 2 is 4, which occupies the downlink control channel of the candidate #12 (ie, CCE0 to CCE3) shown in FIG. 7, other users in the user group can only occupy CCE4 to CCE7. Resources. If the aggregation level of the user equipment 1 is also 4, the user equipment 1 occupies resources of CCE4 to CCE7, and other user equipments do not have CCEs available. If the aggregation level of the user equipment 1 is 2, and the downlink control channel occupies one of the candidates #10 and #11, and only 2 CCEs are occupied, the remaining 2 CCEs may also be available to other user equipments. Therefore, different CCEs in the same user group occupy different aggregation levels of CCEs to allocate resources reasonably, and prevent the downlink control channel of the user equipment from colliding when performing physical resource mapping.
  • the primary information block MIB may be broadcast, where the primary information block MIB includes a time-frequency resource location occupied by the common control resource set, thereby ensuring Each accessed user equipment can acquire a common control resource set.
  • the sending unit 801 is configured to send the current subframe to the user equipment.
  • a current subframe including a physical downlink control channel PDCCH is generated, where the PDCCH includes a common control resource set and at least one user-level control resource set, where the common control resource set is used to carry user group control information;
  • the user group control information is used to indicate a user equipment included in each user group and a time-frequency resource location of the user-level control resource set corresponding to the user group; the user-level control resource set is used to carry a corresponding Downlink control information of the user equipment in the user group; sending the current subframe to the user equipment, and then the user equipment may perform blind detection in the configured user-level control resource set, thereby reducing the blind detection range to reduce blind detection The number of times reduces system latency.
  • FIG. 9 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in the figure, the user equipment in the embodiment of the present invention includes:
  • the receiving unit 901 is configured to receive user group control information in a common control resource set of a physical downlink control channel PDCCH of a current subframe sent by the base station, where the user group control information is used to indicate a user equipment included in each user group and the user The time-frequency resource location of the corresponding user-level control resource set of the group.
  • the base station first generates a current subframe including a physical downlink control channel PDCCH, where the PDCCH includes a common control resource set and at least one user-level control resource set, where the public
  • the common control resource set is used to carry the user group control information
  • the user group control information is used to indicate the user equipment included in each of the user groups and the time-frequency resource location of the user-level control resource set corresponding to the user group
  • the user-level control resource set is configured to carry downlink control information of the user equipment in the corresponding user group, and then send the current subframe to the user equipment.
  • the processing unit 902 is configured to perform blind detection on the corresponding user-level control resource set to obtain downlink control information according to the indication of the user group control information.
  • the PDCCH includes a common control resource set and three user-level control resource sets, and the common control resource set occupies an intermediate frequency band of a frequency domain of a first OFDM symbol of a current subframe, and the common control resource set includes a common control.
  • Information and user group control information wherein the common control information is used to carry system public messages (eg, session initiation protocol sip message, paging Paging message, etc.), and user group control information is used to indicate that each of the user groups is included
  • system public messages eg, session initiation protocol sip message, paging Paging message, etc.
  • the three user-level control resource sets include user-level control resource set 1 (resource area 1-1, resource area 1-2, ..., resource area 1-N) occupying the first OFDM symbol of the current subframe, occupying the current User level control resource set 2 (resource area 2-1, resource area 2-2, ..., resource area 2-N) and user level control resource set 3 (resource area 3-1) of at least two OFDM symbols of a subframe
  • the resource area 3-2, ..., the resource area 3-N), the time-frequency resource positions of each resource area in the user-level control resource set are different from each other.
  • a plurality of downlink scheduling users are included in a certain subframe n, where user equipment 1 is a URLLC user equipment, user equipment 2 is an eMBB user equipment, and a common control resource set includes user group 1 (user group 1 corresponds to User level control resource set 1) and user group 2 (user group 2 corresponds to user level control resource set 2). Since the user equipment 1 has high delay requirements, the user equipment 1 determines the user equipment in the user group 1, and the user group 1 corresponds to the user level control resource set 1, so the downlink control information of the user equipment 1 is mapped to the user-level control resource set. 1.
  • the user equipment 1 performs blind detection on the user level control resource set 1 according to the time-frequency resource location of the user-level control resource set indicated by the user group control information to obtain downlink control information of the user equipment 1. Since the user equipment 2 has high reliability requirements, the user equipment 2 determines the user equipment in the user group 2, and the user group 2 corresponds to the user level control resource set 2, and the user equipment 2 controls the resource set according to the user level control information indicated by the user group control information. The time-frequency resource location is blindly checked at the user-level control resource set 2 to obtain downlink control information. As shown in FIG.
  • both user equipment 1 and user equipment 2 are URLLC user equipments, because user equipment 1 and user equipment 2 Both the user equipment 1 and the user equipment 2 are determined as the user equipment in the user group 1, and the user group 1 corresponds to the user level control resource set 1, so the base station will downlink control information of the user equipment 1 and the user equipment 2
  • the downlink control information is mapped to the user-level control resource set 1.
  • the user equipment 1 and the user equipment 2 control the time-frequency resource location of the resource set according to the user-level control resource indicated by the user group control information, and perform blind detection at the user-level control resource set 1 to obtain Downstream control information.
  • blind detection of different aggregation levels may be performed from the initial time-frequency resource location of the user-level control resource set to obtain downlink control information.
  • the common control resource set and/or the user-level control resource set may be divided into multiple search spaces starting from the starting time-frequency resource location (or starting CCE), and each search space adopts the aggregation level candidate shown in FIG. The way the number is divided.
  • the user equipment performs blind detection on the common control resource set and/or the user-level control resource set, starting from the initial time-frequency resource location (or starting the CCE), the user equipment is blindly checked according to the corresponding candidate for each search space. .
  • the candidate number division manner of the aggregation level includes 15 candidates for every 8 CCEs.
  • the user equipment first performs 15 blind checks on the first 8 CCEs according to the corresponding candidate. If the relevant downlink control information is not decoded, the next search space including 8 CCEs is blindly checked until the decoding obtains relevant downlink control information or Decode all search spaces.
  • the common control resource set of the physical downlink control channel PDCCH of the current subframe sent by the base station may receive the primary information block MIB broadcast by the base station, where the primary information block MIB includes the The time-frequency resource location occupied by the public control resource set ensures that the user equipment can obtain the common control resource set.
  • the storage medium may include: a flash disk, a read-only memory (English: Read-Only Memory, ROM for short), a random access memory (English: Random Access Memory, RAM for short), a magnetic disk or an optical disk.

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  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des modes de réalisation de la présente invention concernent un procédé d'envoi et de réception de canal de commande de liaison descendante physique (PDCCH), et un dispositif associé. Le procédé consiste à : générer une sous-trame actuelle contenant un PDCCH, le PDCCH contenant un ensemble de ressources de commande publiques et au moins un ensemble de ressources de commande de niveau utilisateur, l'ensemble de ressources de commande publiques étant utilisé pour porter des informations de commande de groupe d'utilisateurs, les informations de commande de groupe d'utilisateurs étant utilisées pour indiquer un équipement d'utilisateur inclus dans chaque groupe d'utilisateurs et un emplacement de ressource temps-fréquence de l'ensemble de ressources de commande de niveau utilisateur correspondant au groupe d'utilisateurs, l'ensemble de ressources de commande de niveau d'utilisateur étant utilisé pour porter des informations de commande de liaison descendante de l'équipement d'utilisateur dans le groupe d'utilisateurs correspondant ; et envoyer la sous-trame actuelle à l'équipement d'utilisateur. L'utilisation des modes de réalisation de la présente invention réduit la plage de détection aveugle, diminuant ainsi le nombre de détections aveugles et réduisant la latence du système.
PCT/CN2017/110562 2017-03-14 2017-11-10 Procédé d'envoi et de réception de canal de commande de liaison descendante physique, et dispositif associé Ceased WO2018166226A1 (fr)

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