WO2018166226A1 - Physical downlink control channel sending and receiving method, and related device - Google Patents

Abstract

Disclosed in embodiments of the present invention are a physical downlink control channel (PDCCH) sending and receiving method, and a related device, the method comprising: generating a current subframe comprising a PDCCH, the PDCCH comprising a public control resource set and at least one user-level control resource set, the public control resource set being used for bearing user group control information, the user group control information being used for indicating 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 being used for bearing downlink control information of the user equipment in the corresponding user group; and sending the current subframe to the user equipment. By using the embodiments of the present invention, the blind detection range can be reduced to decrease the number of blind detections and reduce system latency.

Description

Physical downlink control channel transmitting and receiving method, and related device

This application claims the priority of the Chinese Patent Application filed on March 14, 2017, the Chinese Patent Office, Application No. 201710150083.6, the invention titled "A physical downlink control channel transmission and reception method, and related equipment". The content of the application is incorporated herein by reference.

Technical field

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.

Background technique

With the commercial growth of the fourth generation mobile communication technology and the continuous growth of the mobile service, research work on the fifth generation communication technology (5G) has begun worldwide. 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) established the SI (Study Item) research on 5G new air interface research. According to the division of vertical scenes by 5G, 3GPP mainly carries out new air interface technology from three aspects. Research: eMBB (Enhanced Mobile Broadband), URLLC (Ultra-reliable Low-latency Communications) and mMTC (Massive Machine Type Communications). Based on the above application scenarios, 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.

In terms of the design of the downlink control channel of the new air interface, there is currently no perfect design. 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.

Summary of the invention

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:

Generating 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 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 user equipment in the user group Downlink control information;

Sending the current subframe to the user equipment.

Correspondingly, the second aspect of the present invention provides a method for receiving a physical downlink control channel, including:

Receiving 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 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;

And performing 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.

Correspondingly, 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;

And a sending unit, configured to send the current subframe to the user equipment.

Correspondingly, 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

And 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.

In the embodiment of the present invention, 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.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic flowchart of a method for transmitting a physical downlink control channel according to an embodiment of the present invention;

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;

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.

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.

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.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Various aspects are described herein in connection with user equipment (UE) and/or base stations. 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). 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) may refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface. By converting the received air interface frame to an IP packet, the base station can act as a router between the wireless terminal and the rest of the access network, which can include an Internet Protocol (IP) network. The base station can also coordinate the management of the attributes of the air interface.

Moreover, the various functions described herein can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored or transmitted as one or more instructions or code to a computer readable medium. 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. By way of example and not limitation, 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. For example, if you use coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or such as infrared, no Wireless technologies such as line and microwave send software from websites, servers or other remote sources, such as coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave. In the definition. 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.

The various techniques described herein can be used in various wireless communication systems, such as Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access ( OFDMA) systems, single carrier FDMA (SD-FDMA) systems, and other such systems. As used herein, the terms "system" and "network" are often used interchangeably. 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. In addition, 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. 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). Further, CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). Further, 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. For the sake of clarity, terms associated with WCDMA, HSPA, HSDPA, and HSUPA are used in the following description. However, it should be apparent that the appended claims are not intended to be limited to WCDMA, HSPA, HSDPA, and HSUPA unless explicitly stated.

In addition, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". which is, The phrase "X employs A or B" is intended to mean any of the natural inclusive permutations, unless otherwise specified or apparent from the context. That is, any of the following examples satisfies the phrase "X uses A or B": X uses A; X uses B; or X uses both A and B. In addition, the articles "a" and "an", and, ".

Various aspects will be given in terms of systems that may include multiple devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules, etc. discussed in connection with the Figures. A combination of these schemes can also be used.

Please refer to FIG. 1. 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) ).

In a specific implementation, before the current subframe including the physical downlink control channel PDCCH is generated, 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. Further, 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:

First, 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.

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. In this way, 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.

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.

For example, as shown in FIG. 2, 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.

As shown in FIG. 3, 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. Ensure that 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.

As shown in FIG. 4, in another exemplary embodiment, 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.

Optionally, the 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).

It should be noted that 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). However, it should be clear that 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. For example, as shown in FIG. 7 , 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). With 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.

As shown in FIG. 5, since the user equipment 1 and the user equipment 2 occupy the control resource set 1 at the same time, in order to prevent the resource collision of the downlink control information of the user equipment 1 and the user equipment 2 when mapping to the CCE, two different types may be adopted. 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. . For example, when 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.

Optionally, before the generating the current subframe including the physical downlink control channel PDCCH, 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.

S202. Send the current subframe to the user equipment.

In the embodiment of the present invention, 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.

Please refer to FIG. 6. 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.

In a specific implementation, 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.

For example, as shown in FIG. 2, 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.

As shown in FIG. 3, 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. Since both the user equipment 1 and the user equipment 2 have high delay requirements, 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.

Further, 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. When 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. . For example, as shown in FIG. 7, 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.

Optionally, before receiving the user group control information, 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.

Please refer to FIG. 8. 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.

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) ).

In a specific implementation, before the current subframe including the physical downlink control channel PDCCH is generated, 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. Further, 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:

First, 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. In this way, the user equipment in the URLLC scenario can start processing after receiving the first control symbol, thereby reducing the delay.

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. In this way, 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.

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.

For example, as shown in FIG. 2, 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.

As shown in FIG. 3, 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. Ensure that 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. Source set 3.

As shown in FIG. 4, in another exemplary embodiment, 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.

Optionally, the 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).

It should be noted that 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). However, it should be clear that 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. For example, as shown in FIG. 7 , 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). With 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.

As shown in FIG. 5, since the user equipment 1 and the user equipment 2 occupy the control resource set 1 at the same time, in order to prevent the resource collision of the downlink control information of the user equipment 1 and the user equipment 2 when mapping to the CCE, two different types may be adopted. 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. For example, when 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.

Optionally, before the generating the current subframe including the physical downlink control channel PDCCH, 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.

In the embodiment of the present invention, 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.

Please refer to FIG. 9. 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.

In a specific implementation, 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.

For example, as shown in FIG. 2, 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 The user equipment and the 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.

As shown in FIG. 3, 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. 4, 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.

Further, 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. When 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. . For example, as shown in FIG. 7, 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.

Optionally, before receiving the user group control information, 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.

It should be noted that, for the foregoing various method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should understand that the present invention is not limited by the described action sequence. Because certain steps may be performed in other sequences or concurrently in accordance with the present invention. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the above embodiments, the descriptions of the various embodiments are different, and the parts that are not described in detail in a certain embodiment can be referred to the related descriptions of other embodiments.

One of ordinary skill in the art can understand that all or part of the various methods of the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer. 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.

The content downloading method and the related device and system provided by the embodiments of the present invention are described in detail above. The principles and implementation manners of the present invention are described in the specific examples. The description of the above embodiments is only used to help understand the present invention. The method of the invention and its core idea; at the same time, for the person of ordinary skill in the art, according to the idea of the present invention, there are some changes in the specific embodiment and the scope of application. In summary, the content of the specification should not be understood. To limit the invention.

Claims (28)

A physical downlink control channel sending method, where the method includes: Generating 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 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 user equipment in the user group Downlink control information; Sending the current subframe to the user equipment. The method according to claim 1, wherein before the generating the current subframe including the physical downlink control channel PDCCH, the method further includes: Broadcasting a primary information block MIB, the primary information block MIB including a time-frequency resource location occupied by the common control resource set. The method according to claim 1, wherein before the generating the current subframe including the physical downlink control channel PDCCH, the method further includes: Determining the user equipment in the user group according to the service scenario type of the user equipment scheduled by the current subframe; Determining, according to the service scenario type of the user equipment in the user group, a user-level control resource set corresponding to the user group. The method according to claim 3, wherein the user equipments of the same service scene type belong to the same user group. The method according to claim 4, wherein the determining the user-level control resource set corresponding to the user group according to the service scenario type of the user equipment in the user group comprises: The delay requirement and/or reliability according to the service scenario type of the user equipment in the user group The requirement requires determining the user-level control resource set corresponding to the user group. The method according to claim 5, wherein said plurality of user-level control resource sets comprise at least a first user-level control resource set, said first user-level control resource set occupies a first OFDM of a current subframe a symbol, the generating, including the current subframe of the physical downlink control channel PDCCH, includes: And if the service scenario of the user equipment in the user group is a low-latency and high-reliability communication 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 sub- frame. The method according to claim 5, wherein said plurality of user-level control resource sets comprise at least a second user-level control resource set, said second user-level control resource set occupies at least two OFDM of a current subframe a symbol, the generating, including the current subframe of the physical downlink control channel PDCCH, includes: And if the service scenario of the user equipment in the user group is an enhanced mobile broadband eMBB, 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 method according to any one of claims 1 to 7, wherein before the generating the current subframe including the physical downlink control channel PDCCH, the method further includes: Determining the control channel unit CCE occupied by the downlink control information of the user equipment in the user group, where different user equipments in the same user group occupy CCEs of different aggregation levels. The method according to any one of claims 1 to 7, wherein the common control resource set occupies an intermediate frequency band of a frequency domain of a first OFDM symbol of the current subframe. The method according to any one of claims 1 to 7, wherein the common control resource set further comprises common control information, wherein the common control information comprises a system message, a paging message, and a random access response message. At least one. A method for receiving a downlink control channel, where the method includes: Receiving 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 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; And performing 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 method according to claim 11, wherein the public control resource set of the physical downlink control channel PDCCH of the current subframe sent by the base station, before receiving the user group control information, further includes: Receiving a primary information block MIB broadcast by the base station; the primary information block MIB includes a time-frequency resource location occupied by the common control resource set. The method according to claim 11, wherein the performing 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 includes: Blind detection of different aggregation levels is performed from the initial time-frequency resource location of the user-level control resource set to obtain downlink control information. The method of any of claims 11-13, further comprising: The common control resource set of the physical downlink control channel PDCCH of the current subframe transmitted by the base station receives the common control information, where the common control information includes at least one of a system message, a paging message, and a random access response message. A base station, the base station includes: 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; User group control information is used to indicate each of the a user equipment included in the 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 configured to carry downlink control information of the user equipment in the user group; And a sending unit, configured to send the current subframe to the user equipment. The base station according to claim 15, wherein The sending unit is further configured to broadcast a primary information block MIB, where the primary information block MIB includes a time-frequency resource location occupied by the common control resource set. The base station according to claim 15, wherein The processing unit is further configured to determine, according to a service scenario type of the user equipment that is scheduled by the current subframe, a user equipment in the user group, and determine, according to the service scenario type of the user equipment in the user group, user-level control corresponding to the user group. Resource set. The base station according to claim 17, wherein the user equipments of the same service scene type belong to the same user group. The base station according to claim 18, wherein the processing unit is specifically configured to: Determining a user-level control resource set corresponding to the user group according to a delay requirement and/or a reliability requirement corresponding to the service scenario type of the user equipment in the user group. The base station according to claim 19, wherein said plurality of user-level control resource sets include at least a first user-level control resource set, and said first user-level control resource set occupies a first OFDM of a current subframe Symbol, the processing unit is specifically used to: And if the service scenario of the user equipment in the user group is a low-latency and high-reliability communication 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 sub- frame. The base station according to claim 19, wherein said plurality of user level control resources The 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, where the processing unit is specifically configured to: And if the service scenario of the user equipment in the user group is an enhanced mobile broadband eMBB, 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. A base station according to any of claims 15-21, characterized in that The processing unit is further configured to determine a control channel unit CCE occupied by the downlink control information of the user equipment in the user group, where different user equipments in the same user group occupy CCEs of different aggregation levels. The base station according to any one of claims 15 to 21, wherein the common control resource set occupies an intermediate frequency band of a frequency domain of a first OFDM symbol of the current subframe. A base station according to any of claims 15-21, characterized in that The common control resource set further includes common control information, where the common control information includes at least one of a system message, a paging message, and a random access response message. A user equipment, where the user equipment includes: 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 The time-frequency resource location of the corresponding user-level control resource set; And 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. A user equipment according to claim 25, wherein The receiving unit is further configured to receive a primary information block MIB broadcast by the base station; the primary information block MIB includes a time-frequency resource location occupied by the common control resource set. The user equipment of claim 25, wherein the processing unit is specifically configured to: Blind detection of different aggregation levels is performed from the initial time-frequency resource location of the user-level control resource set to obtain downlink control information. The user equipment according to any one of claims 25 to 27, wherein the receiving unit is further configured to receive common 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 common control information includes at least one of a system message, a paging message, and a random access response message.

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