WO2018103558A1

WO2018103558A1 - Methods of transmitting and detecting downlink control information, device, base station, and terminal

Info

Publication number: WO2018103558A1
Application number: PCT/CN2017/113520
Authority: WO
Inventors: 张晨晨; 郝鹏
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-12-07
Filing date: 2017-11-29
Publication date: 2018-06-14
Also published as: CN108174453A

Abstract

The embodiments of the invention disclose methods of transmitting and detecting downlink control information, a device, a base station, and a terminal. The method of transmitting downlink control information comprises: a base station determines a group radio network temporary identifier of a user group to which a terminal belongs, performs, using the group radio network temporary identifier, cyclic redundancy check scrambling on group downlink control information of the user group to which the terminal belongs, and transmits, via a physical downlink control channel and to the terminal, the group downlink control information. The method of detecting downlink control information comprises: a terminal obtains a group radio network temporary identifier, performs, using the group radio network temporary identifier, blind detection on a search space in a physical downlink control channel, and obtains group downlink control information of a user group to which the terminal belongs. The embodiments of the invention also disclose a computer storage medium.

Description

Transmission and detection method and device for downlink control information, base station and terminal

The present application is filed on the basis of the Chinese Patent Application No. 201611117650.

Technical field

The embodiments of the present invention relate to, but are not limited to, the field of wireless communication technologies, and in particular, to a method and device for transmitting downlink control information, a detection method and device, a base station, and a terminal.

Background technique

With the development of wireless communication technology and the increasing demand for communication by users, in order to meet the needs of higher, faster and newer communication, the fifth generation mobile communication (5th Generation, 5G) technology has become the network development in the future. trend.

As one of the important communication means for future 5G technology, high-frequency communication can provide high-speed data communication by using the large bandwidth of high-frequency communication to meet the demand for large data in 5G communication. The loss on the high frequency propagation is larger, and the coverage radius is relatively smaller under the same power, which also determines the beamforming technology used in the high frequency communication system networking to increase the coverage radius. Due to factors such as the number of radio link, the transmit power, and the beam gain, the same OFDM (Orthogonal Frequency Division Multiplexing) symbol cannot be simultaneously transmitted to cover the entire cell, regardless of the downlink traffic channel or the downlink data channel. All the downlink beams, that is, the beams on one symbol, are difficult to achieve full-cell coverage and can only reach the coverage of one beam group. If the coverage of the whole cell is to be realized, one possible way is to use TDM (Time Division Multiplexing). The method of round-robin or multiple beam groups according to scheduling requirements to achieve coverage of the whole cell. Therefore, the transmission of the downlink control channel is limited by the narrow coverage of the high-frequency communication beam (beam), and it may be necessary to control the DCI (Downlink Control Information). The cost is the most important. If the DCI is very expensive, the PDCCH (Physical Downlink Control Channel) field may require too much time-frequency to achieve good coverage and transmit with similar beam sweeping. Resources.

Summary of the invention

The invention provides a method and a device for transmitting downlink control information, a detection method and device, a base station and a terminal, which at least partially solve the problem of large DCI overhead.

The embodiment of the invention provides a downlink control information sending method, including:

Determining, by the base station, a group radio network temporary identifier of the user group where the terminal is located, and performing cyclic redundancy check scrambling on the group downlink control information of the user group where the terminal is located by using the group radio network temporary identifier;

And transmitting the grouped downlink control information to the terminal by using the physical downlink control channel.

The embodiment of the invention further provides a downlink control information sending apparatus, including:

a group radio network temporary identifier determining unit configured to determine a group radio network temporary identifier of the user group where the terminal is located;

The processing unit is configured to perform cyclic redundancy check scrambling on the group downlink control information of the user group where the terminal is located by using the group radio network temporary identifier;

The sending unit is configured to send the scrambled group downlink control information to the terminal by using a physical downlink control channel.

An embodiment of the present invention further provides a base station, where the base station includes the downlink control information sending apparatus.

The embodiment of the invention further provides a downlink control information detecting method, including:

The terminal acquires the group wireless network temporary identifier, uses the set of the wireless network temporary identifier to perform blind detection on the physical downlink control channel search space, and obtains the group downlink control information of the user group where the terminal is located.

The embodiment of the invention further provides a downlink control information detecting apparatus, including:

a group radio network temporary identifier obtaining unit configured to acquire a group radio network temporary identifier;

The blind detection unit is configured to use the set of the wireless network temporary identifier to perform blind detection on the search space of the physical downlink control channel, and obtain group downlink control information of the user group where the terminal is located.

The embodiment of the present invention further provides a terminal, where the terminal includes the downlink control information detecting apparatus.

In the embodiment of the present invention, the terminal acquires the group wireless network temporary identifier, uses the set of the wireless network temporary identifier to perform blind detection on the physical downlink control channel search space, and obtains group downlink control information of the user group where the terminal is located.

On the one hand, since the group radio network temporary identifier (Group RNTI) is used to descramble the group downlink control information (Group DCI), the number of DCIs transmitted is reduced relative to the single DCI sent to each terminal, and the multiple DCIs are required to be carried. The overhead caused by the specific bits reduces the overall overhead of the DCI.

On the other hand, since the group downlink control information is scrambled by the temporary identifier of the group radio network, the allocation of a dedicated radio network temporary identifier for each terminal is reduced, thereby reducing the overhead of the temporary identifier of the wireless network, and avoiding the wireless network. Use conflicts in the case of a limited number of temporary identifiers.

DRAWINGS

The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification, which together with the embodiments of the present application are used to explain the technical solutions of the present invention, and do not constitute a limitation of the technical solutions of the present invention.

1 is a schematic diagram of a search space for all PDCCH search spaces according to an embodiment of the present invention;

2 is a schematic diagram of a search space being a partial PDCCH search space according to an embodiment of the present invention;

3 is a schematic diagram of different groups of wireless network temporary identifiers corresponding to different search spaces according to an embodiment of the present invention;

4 is another schematic diagram of different groups of wireless network temporary identifiers corresponding to different search spaces according to an embodiment of the present invention;

FIG. 5 is a block diagram of a downlink control information sending apparatus according to an embodiment of the present invention;

FIG. 6 is a block diagram of a downlink control information detecting apparatus according to an embodiment of the present invention.

detailed description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

The steps illustrated in the flowchart of the figures may be executed in a computer system such as a set of computer executable instructions. Also, although logical sequences are shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than the ones described herein.

For users with some of the same transmission characteristics, if these transmission characteristics need to be indicated to the user in the DCI, if Group DCI (Group Downlink Control Information) is used to carry these transmission characteristics and avoid sending DCI separately for each user, The DCI overhead is greatly reduced, which is more suitable for the characteristics of the high-frequency communication beam. When the user detects the PDCCH blindly, the RNTI (Radio Network Temporary Identity) needs to be used to descramble the CRC (Cyclic Redundancy Check). ,Cyclic Redundancy Check), if the DCI information can be read correctly, the Group RNTI (Group Radio Network Temporary Identity) corresponding to the Group DCI is required for the reception of the Group DCI.

The PDCCH sent by the base station to the user may include one or more of Common DCI (Common Downlink Control Information), Group DCI, and UE-specific DCI (User-Specific Downlink Control Information). This application is mainly for the Group DCI. According to some transmission information of the user, the user can be divided into multiple groups, and the transmission information of all users in the same group is the same, the transmission information is Group DCI, and the Group DCIs between different groups are different.

For users in the same group, when transmitting the Group DCI, the base station uses the Group-specific (group-specific) method to perform CRC scrambling on the Group DCI by using the Group RNTI (Group Radio Network Temporary Identity) corresponding to the group user. .

Correspondingly, the UE (User Equipment) performs blind detection in a certain search space when receiving the downlink control channel, and may attempt to descramble the CRC with the Group RNTI of the group in which it is located. If the CRC check can be successfully descrambled, The UE can read the Group DCI content.

The Group RNTI is an identifier that can be uniquely determined according to certain group information that is different from other group users by a group of users, and/or some system information.

The embodiment of the invention provides a method for transmitting downlink control information, including:

Determining, by the base station, the group radio network temporary identifier of the user group where the terminal is located, performing the cyclic redundancy check scrambling on the group downlink control information of the user group where the terminal is located, and transmitting the The group downlink control information is sent to the terminal.

In an embodiment of the present invention, the determining, by the base station, the group radio network temporary identifier of the user group where the terminal is located includes: determining, by the base station, the terminal according to the mapping relationship information between the group related information and the group radio network temporary identifier. The group wireless network temporary identifier of the user group. The mapping relationship information may be a mapping table or a function relationship. The base station may obtain the group related information, and find the mapping table to obtain the group downlink control information of the user group where the terminal is located. Alternatively, the base station may obtain the group related information, and perform calculation according to the function relationship to obtain the user of the terminal. Group group downlink control information.

In another embodiment of the present invention, the base station sends the mapping relationship information to the terminal by using a radio resource control signaling or a system message; or the base station and the terminal pre-agreed the mapping relationship information. . For example, the base station may send the mapping table to the terminal, or may pre-agreed the mapping table with the terminal. Of course, the base station may also send the functional relationship to the terminal, or the base station may pre-agreed the functional relationship with the terminal.

In still another embodiment of the present invention, the group related information includes one or a combination of the following: The beam information of the beam carrying the group downlink control information, the radio frame number of the radio frame carrying the group downlink control information, the slot number of the time slot carrying the group downlink control information, and the downlink control information of the group The subframe number of the subframe, the subband information of the downlink control channel carrying the group downlink control information, the subband information of the downlink traffic channel related to the group downlink control information, and the downlink carrying the downlink control information of the group Subcarrier spacing information of the control channel, subcarrier spacing information of the downlink traffic channel related to the group downlink control information, and slot structure information of a predefined transmission time unit carrying the group downlink control information. The beam information may be a beam identifier; the subband information may be a subband identifier, and the subcarrier spacing information may be a Numerology identifier. The slot structure information refers to a predefined transmission time unit. If the downlink transmission domain occupies x symbols, the GP (Guard Period) domain occupies y symbols, and the uplink transmission domain occupies z symbols, x, y, The value and specific location of z determine a transmission structure. The predefined transmission time unit may be a subframe, a slot, a mini-slot (mini-slot) or an aggregated subframe, an aggregation slot, and an aggregation mini-slot. You need to specify the resources contained in the transmission time unit. The base station and the terminal can pre-agreed which one of the transmission time units specifically refers to.

In still another embodiment of the present invention, the method further includes: the base station configuring, by using radio resource control signaling, a candidate group radio network temporary identifier set to the terminal. The terminal may perform blind detection using the group wireless network temporary identifier in the candidate group wireless network temporary identifier set.

The terminal acquires the group wireless network temporary identifier, and uses the set of the wireless network temporary identifier to perform blind detection on the physical downlink control channel search space, and obtains the group downlink control information of the user group where the terminal is located.

In the embodiment of the present invention, the group radio network temporary identifier may be received by the terminal or the like from the base station in advance, for example, the base station is delivered by high-level signaling above the physical layer, such as the radio link control (RRC) signaling, or Broadcast by system messages. Terminal utilization group wireless network temporary standard If the data sent by the physical downlink control channel is blindly detected, if the data obtained after the blind detection is correctly decoded, the group downlink control information of the user group in which the terminal is located may be obtained. Usually one user group includes multiple users, corresponding to multiple terminals.

In an embodiment of the present invention, the acquiring the temporary wireless network identifier of the terminal includes:

The terminal determines the group radio network temporary identifier of the user group where the terminal is located, according to the mapping relationship information between the group related information and the group radio network temporary identifier.

In a further embodiment of the present invention, the terminal acquires the mapping relationship information by: the terminal receiving the mapping relationship information from the base station, or the terminal and the base station pre-arranging the Mapping relationship information.

In another embodiment of the present invention, the receiving, by the terminal, the mapping relationship information from the base station includes: receiving the mapping relationship information that is sent by the base station by using a radio resource control signaling or a system message.

In still another embodiment of the present invention, the group related information includes one or a combination of the following: current beam information, current radio frame number, current slot number, current subframe number, and subband information of the current downlink control channel. The sub-band information of the current downlink traffic channel, the sub-carrier spacing information of the current downlink control channel, the sub-carrier spacing information of the current downlink traffic channel, and the slot structure information of the current predefined transmission time unit. The beam information may be a beam identifier; the subband information may be a subband identifier; and the subcarrier spacing information may be a Numerology identifier. The current reference here refers to the information about the time-frequency resources that the terminal is currently blindly detecting. For example, the current beam information refers to the beam information of the beam in which the terminal is currently being detected. The sub-band information of the current downlink control channel refers to the sub-band information of the downlink control channel that the terminal is currently to be blindly detected, and the current downlink traffic channel. The subband information refers to subband information of a downlink traffic channel related to a downlink control channel that the terminal is currently to be blindly detected, and the like.

In another embodiment of the present invention, the terminal cannot determine a specific value of the temporary identifier of the group radio network, and only one set of the temporary identifiers of the group of radio networks configured by the base station, and the terminal sequentially uses the set. The group radio network temporary identifier in the group performs blind detection until the group downlink control information of the user group where the terminal is located is obtained. Optionally, the acquiring the temporary wireless network temporary identifier of the terminal includes: the terminal receiving a candidate group wireless network temporary identifier set configured by the base station by using radio resource control signaling, and acquiring each group in the group wireless network temporary identifier set. Temporary identification of the wireless network;

The group uses the wireless network temporary identifier to perform blind detection on the search space of the physical downlink control channel, and the group downlink control information of the user group where the terminal is located includes:

The terminal uses the group radio network temporary identifier in the candidate group radio network temporary identifier set to perform blind detection on the physical downlink control channel search space until the group downlink control information of the user group in which the terminal is located is obtained.

In still another embodiment of the present invention, the blind detecting using the set of wireless network temporary identifiers in a search space of a physical downlink control channel includes:

Performing blind detection on the search space corresponding to the entire physical downlink control channel configured by the base station through radio resource control signaling;

Or performing blind detection on the search space corresponding to the downlink control information of the group that is semi-statically configured by the radio resource control signaling;

or,

The terminal receives a mapping relationship between the temporary identifier of the group wireless network and the search space that is configured by the base station by using the radio resource control signaling, and determines, according to the mapping relationship, a search corresponding to the temporary identifier of the group wireless network of the user group where the terminal is located. The space is blindly detected in a search space corresponding to the group wireless network temporary identifier of the user group where the terminal is located.

In an embodiment of the present invention, the search space for the blind detection by the UE may be a search space corresponding to the entire PDCCH that is configured by the base station through the RRC signaling semi-statically. As shown in FIG. 1 , the shaded portion in FIG. 1 corresponds to the entire PDCCH. Search space. At this time, the search space is not separately configured for the Group DCI, and the blind detection of the Group DCI is performed directly in the search space of the PDCCH.

In another embodiment of the present invention, the search space for the UE to perform blind detection may be a base station communication. The Group search space of the corresponding Group DCI configured by the semi-static configuration of the RRC signaling is a partial PDCCH search space, as shown in the shaded portion in FIG. In this mode, the Group search space is configured for the Group DCI. The Group DCI needs to be blindly detected in the Group search space configured for the Group DCI.

In yet another embodiment of the invention, a different search space can be configured for the Group RNTI. The search space for the UE to perform blind detection may be the search space corresponding to the Group RNTI of the user group in which the UE is located. The different group RNTIs can correspond to different search spaces, that is, there is a mapping relationship between the group RNTI and the search space, which can be a one-to-one correspondence. As shown in FIG. 3, the four group search spaces are respectively different. The Group RNTI, the different shadow types in Figure 3 represent different Group search spaces, respectively corresponding to different Group RNTIs; or may be the relationship of multiple Group RNTIs corresponding to one search space. The difference between FIG. 2 and FIG. 3 is that, in FIG. 2, all Group RNTIs correspond to one Group search space, and in FIG. 3, different Group RNTIs correspond to different search spaces. For example, when there are four Group RNTIs, Group RNTI1, Group RNTI2, Group RNTI3, and Group RNTI4, Group RNTI1, Group RNTI2, Group RNTI3, and Group RNTI4 correspond to the search space in the shaded portion in FIG.

The base station can semi-statically configure the mapping relationship between the Group RNTI and the search space through RRC signaling, so that when the UE uses different Group RNTIs to perform blind detection, it can be blindly detected in the search space corresponding to the Group RNTI.

The notification bit of the RNTI can be implemented in two ways:

One way is to not extend the notification bit of the existing RNTI, that is, still use the original number of bits (16 bits) to notify the RNTI, and take the first few values or the last values of the current LTE C-RNTI value range. Reserved for the Group RNTI, these values reserved for the Group RNTI can no longer be used by other types of RNTIs.

Another way is to extend the notification bits of the existing RNTI, for example, to inform the RNTI with 20 bits or 24 bits or 28 bits, so that the Group RNTI value can start from 0FFFF.

A group RNTI may be configured with one pilot configuration, that is, one or more users configured with the same Group RNTI, receiving the same pilot sequence at the same port and the same time-frequency resource location, and the pilot may be The beam direction information is included, and the specific beam direction information may not be included.

The following example illustrates the mapping between Group RNTI and group related information.

Example one

In this example, the group related information is beam information, and may alternatively be a beam identifier.

In this example, the Group RNTI has a mapping relationship with the beam information. In a certain beam width, one beam direction corresponds to one Group RNTI, or M beam directions correspond to one Group RNTI, and M is a positive integer greater than 1.

The base station configures a mapping table of the beam direction and all candidate Group RNTIs, for example, the beam set {Beam 1, ..., Beam n} corresponds to a Group RNTI of X, and the corresponding values of the beam sets {Beam n+1, ..., Beam m} The Group RNTI of Y, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 2. The mapping table is only an example, and other mapping relationships may be set as needed. Among them, Beam1 to Beam m are Beam ID.

The base station may use RRC (Radio Resource Control) signaling or system messages (MIB (Master Information Block), SIB1 (System Information Block 1, System Information Block 1), SI (System Information, system). In the information)), the terminal is notified of the mapping table. The UE can determine the specific value of its Group RNTI according to the current beam direction and the mapping table.

In another embodiment of the present invention, the mapping table may not be established, and the base station and the UE may calculate the group of the user group where the UE is located according to the BEA ID (beam identification) corresponding to the specific beam direction and the pre-configured function relationship. RNTI.

Example two

In this example, the group related information may include: beam information and/or current time information. The Group RNTI of the user group in which the terminal is located is determined according to the beam information and the current time information. The current time information may be one of a current subframe number, a slot number, a radio frame number, or a combination thereof.

In this example, the base station and the UE may pre-agreed the beam identifier, the current radio frame number, or the slot number as a function of the Group RNTI, and the base station and the UE may use the current radio frame number or the subframe number or the slot number according to the Beam ID. And, the agreed function relationship, and calculating the Group RNTI of the user group in which the UE is located. The functional relationship can be: Group RNTI=Beam ID+k; k is a constant, and the value can be 1, 61, or other positive integer.

Example three

In this example, the group related information is the subband (subband) information in the frequency domain, where the subband in the frequency domain may be the subband corresponding to the downlink control channel or the subband corresponding to the downlink traffic channel.

In this example, the base station configures a mapping table of the frequency domain Subband and all candidate Group RNTIs, for example, a Subband set {SB1,. . . , SBn} corresponds to the Group RNTI of X, the Subband set set {SB n+1, ..., SB m} corresponds to the Group RNTI of Y, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 2. . The SB 1 to SB m are Subband IDs, and the frequency range on one carrier is divided into several Subbands, and each Subband has a corresponding Subband ID.

The base station may notify the UE of the mapping table by RRC signaling or in system messages (MIB, SIB1, SI). The UE may determine the Group RNTI of the user group in which the UE is located according to the current Subband and the mapping table. The current subband may be the current downlink control channel Subband or the current downlink traffic channel Subband.

In other embodiments of the present invention, the base station and the UE may not transmit the mapping table to the UE, and the base station and the UE pre-agreed the functional relationship between the Subband ID and the Group RNTI, and the base station and the UE may determine according to the current Subband ID and the agreed function relationship. Group RNTI of the user group where the UE is located. For example, the functional relationship may be Group RNTI=Subband ID+k; k is a constant, and the value may be 1, 61, or other positive integer.

Example four

In this example, the group related information is a Numerology (Subcarrier Interval) information, and the Numerology information may be a Numerology ID corresponding to the downlink control channel, or may be a Numerology ID corresponding to the downlink traffic channel.

In this embodiment, the base station configures a mapping table of Numerology and all candidate Group RNTIs, for example, a Numerology set {Numerology1,. . . , Numerology n} corresponds to a Group RNTI with a value of X, Numerology set {Numerology n+1, ..., Numerology m} corresponds to a Group RNTI with a value of Y, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 2. . The Numerology 1 to the Numerology m are Numerology IDs, and the subcarrier spacings corresponding to different Numerology IDs are different, and the OFDM symbol lengths are different.

The base station may notify the UE of the mapping table by RRC signaling or in system messages (MIB, SIB1, SI). After receiving the mapping table, the UE may determine the Group RNTI of the user group where the UE is located according to the current Numerology information and the mapping table. The current Numerology information may be the Numerology information of the current downlink control channel, or may be the Numerology information of the current downlink traffic channel.

In another embodiment of the present invention, the mapping table may not be established, and the base station and the UE may pre-agreed the functional relationship between the Numerology information and the Group RNTI, and determine the user group where the UE is located according to the specific current Numerology information and the agreed function relationship. Group RNTI. For example, the function relationship may be Group RNTI=Numerology ID+k, k is a constant, and the value may be 1, 61, or other positive integer.

Example five

In this example, the group related information is slot structure information. In this embodiment, the base station configures a slot. The mapping table of the structure information and all the candidate Group RNTIs, the base station may notify the UE of the mapping table by using RRC signaling or in system messages (MIB, SIB1, SI). The UE can determine the Group RNTI of the user group in which the UE is located according to the current slot structure information and the mapping table.

In another embodiment of the present invention, the mapping table may not be established, and the base station and the UE may pre-agreed the mapping relationship between the slot structure information and the Group RNTI, and determine the Group RNTI according to the specific current slot structure information and the agreed mapping relationship. .

Example six

In this embodiment, the group related information may be one or more of the Beam information, the current time information, the Subband information, and the Numerology information, and the Group RNTI is calculated according to the agreed function relationship, wherein the agreed function relationship may be:

Group RNTI=Beam ID+k+Subband ID;

Or, Group RNTI=Beam ID+k+Numerology ID;

k is a constant, the value can be 1, 61, or other positive integers. The above functional relationship is only an example, and other functional relationships can be agreed as needed.

Example seven

The base station determines a mapping relationship between the Group RNTI and the beam information. The notification bit of the RNTI is still 16 bits, and the Group RNTI uses the values originally reserved for the C-RNTI. The mapping between the group RNTI and the beam information corresponds to different beam widths, and different beam IDs correspond to different Group RNTI values. As shown in Table 1 or Table 2 below, Table 1 corresponds to the case where the Group RNTI values are not multiplexed under different beam widths. Table 2 corresponds to the case where the Group RNTI values are multiplexed under different beam widths.

Table 1 Mapping between a Group RNTI and a Beam ID

Table 2 Mapping between a Group RNTI and a Beam ID

The base station notifies the terminal of the mapping table of the beam and the Group RNTI by using the RRC signaling or the SIB message. In the PDCCH domain of each subframe, the terminal searches for the mapping according to the current beam information according to the current state if there is a DCI expected to be received. The table determines the GroupRNTI currently used by itself, and uses the Group RNTI to blindly detect all or part of the PDCCH search space. If the part of the PDCCH search space is blindly detected, the terminal knows the mapping relationship between the Group RNTI and the search space, that is, the base station has sent the mapping relationship between the Group RNTI and the search space to the terminal.

Example eight

The base station configures a candidate Group RNTI set {Group RNTI1, Group RNTI2, Group RNTI3} for the terminal through RRC signaling, and the base station also notifies the correspondence table between the different GroupRNTIs and the blind detection search space of the terminal through RRC signaling, as shown in Table 3 or Table 4 below. Or as shown in Table 5.

Table 3: Group RNTI and search space correspondence table

Table 4: Group RNTI and search space correspondence table

Group RNTI value

Group search space CCE range

Group RNTI1Group RNTI1	CCE0-CCE9CCE0-CCE9
Group RNTI2Group RNTI2	CCE10—CCE19CCE10—CCE19
Group RNTI3Group RNTI3	CCE20—CCE29CCE20—CCE29
…...	…...

Table 5: Group RNTI and search space correspondence table

In Table 3, different search space sizes are represented by different CCE numbers, that is, corresponding to different Group RNTIs, the search space size may be different.

In Table 4, different Group RNTIs correspond to different CCE ranges.

In Table 5, different Group RNTIs correspond to different search space time-frequency resources, and the entire search space is divided into a plurality of small blocks, which may be time division or frequency division, and SPx represents different small block search spaces, as shown in FIG. SP5.

When the terminal is blindly detected by the Group RNTI, each group RNTI in the candidate Group RNTI set is blindly detected in the corresponding search space until the Group DCI of the user group in which the terminal is located is detected.

In other embodiments of the present invention, if the Group RNTI does not exist with the search space Therefore, when the terminal is blindly detected by the candidate Group RNTI set, the terminal may also perform blind detection in all or part of the PDCCH search space by using each Group RNTI in the candidate Group RNTI set.

The embodiment of the present invention further provides a downlink control information sending apparatus, as shown in FIG. 5, including:

The group radio network temporary identifier determining unit 501 is configured to determine a group radio network temporary identifier corresponding to the group downlink control information of the user group where the terminal is located;

The processing unit 502 is configured to perform cyclic redundancy check scrambling on the group downlink control information by using the group radio network temporary identifier.

The sending unit 503 is configured to send the scrambled group downlink control information to the terminal by using a physical downlink control channel.

The group radio network temporary identifier determining unit 501 may be a receiving antenna, and receive a group radio network temporary identifier from the base station.

The processing unit 502 can correspond to a processor, which can be a central processing unit, a microprocessor, a digital signal processor, an application processor, an application specific integrated circuit, or a programmable array.

The sending unit 503 can correspond to a transmitting antenna, for example, to a terminal.

In an embodiment of the present invention, the group radio network temporary identifier determining unit 501 determines that the group radio network temporary identifier corresponding to the group downlink control information of the user group where the terminal is located includes:

The group downlink control information of the user group in which the terminal is located is determined according to the mapping relationship information between the group-related information and the group wireless network temporary identifier.

In an embodiment of the invention, the sending unit 503 is further configured to send the mapping relationship information to the terminal by using a radio resource control signaling or a system message.

In another embodiment of the present invention, the group related information includes one or a combination thereof: beam information of a beam carrying the group downlink control information, and a radio frame number of a radio frame carrying the group downlink control information. a slot number of a time slot carrying the group downlink control information, a subframe number of a subframe carrying the group downlink control information, subband information of a downlink control channel carrying the group downlink control information, and the Subband information of the downlink traffic channel related to the downlink control information, The subcarrier spacing information of the downlink control channel carrying the group downlink control information, the subcarrier spacing information of the downlink traffic channel related to the group downlink control information, and the time of the predefined transmission time unit carrying the group downlink control information Gap structure information.

In still another embodiment of the present invention, the sending unit 503 is further configured to configure, by using radio resource control signaling, a candidate group radio network temporary identifier set to the terminal;

The group radio network temporary identifier determining unit 501 determines that the group radio network temporary identifier corresponding to the group downlink control information of the user group in which the terminal is located includes: selecting a group radio network temporary identifier from the candidate group radio network temporary identifier set as the terminal The group wireless network temporary identifier of the user group.

An embodiment of the present invention further provides a base station, including the foregoing downlink control information sending apparatus.

The embodiment of the invention further provides a downlink control information detecting device, as shown in FIG. 6, comprising:

The group wireless network temporary identifier obtaining unit 601 is configured to acquire a temporary identifier of the group wireless network;

The blind detection unit 602 is configured to use the set of radio network temporary identifiers to perform blind detection on the search space of the physical downlink control channel, and obtain group downlink control information of the user group where the terminal is located.

The group radio network temporary identifier obtaining unit 601 may receive the group radio network temporary identifier from the base station corresponding to the receiving antenna or the like, or may be a calculator or a processor having a computing function, and obtain the group wireless by calculation. Network temporary identification.

The blind detection unit 602 can be used for a device such as a processor or a decoder, and can be used for blind detection data, thereby connecting the group downlink control information of the user group where the terminal is located.

In an embodiment of the present invention, the group radio network temporary identifier obtaining unit 601 acquiring the group radio network temporary identifier includes:

And determining, according to the mapping relationship information between the group related information and the group wireless network temporary identifier, the group wireless network temporary identifier of the user group where the terminal is located.

In an embodiment of the present invention, the group radio network temporary identifier obtaining unit 601 is further configured to acquire the mapping relationship information according to the following manner: receiving the mapping relationship information from a base station, Or pre-arranging the mapping relationship information with the base station.

In another embodiment of the present invention, the receiving, by the group, the wireless network temporary identifier acquiring unit 601, the mapping relationship information that is sent by the base station by using a radio resource control signaling or a system message .

In still another embodiment of the present invention, the group related information includes one or a combination of the following: the group related information includes one or a combination thereof: current beam information, current radio frame number, current slot number, Current subframe number, subband information of the current downlink control channel, subband information of the current downlink traffic channel, subcarrier spacing information of the current downlink control channel, subcarrier spacing information of the current downlink traffic channel, and current predefined transmission time unit Time slot structure information.

In still another embodiment of the present invention, the group radio network temporary identifier acquisition unit 601 acquiring the group radio network temporary identifier includes: receiving a candidate group radio network temporary identifier set configured by the base station by using radio resource control signaling, and acquiring the group Each group of wireless network temporary identifiers in the wireless network temporary identification set;

The blind detection unit 602 uses the set of radio network temporary identifiers to perform blind detection on the search space of the physical downlink control channel, and the group downlink control information of the user group in which the terminal is located includes:

The blind detection unit 602 uses the group radio network temporary identifier in the candidate group radio network temporary identifier set to perform blind detection on the search space of the physical downlink control channel, and obtains group downlink control information of the user group where the terminal is located. .

In still another embodiment of the present invention, the blind detection unit 602 performs blind detection on a search space of a physical downlink control channel, including:

Or performing blind detection on the search space of the corresponding group downlink control information that is semi-statically configured by the base station by using the radio resource control signaling;

or,

Receiving, by the base station, a mapping relationship between the temporary identifiers of the group wireless network and the search space that are semi-statically configured by the radio resource control signaling, and determining, according to the mapping relationship, a search space corresponding to the temporary identifier of the group wireless network of the user group where the terminal is located, The search space corresponding to the group radio network temporary identifier of the user group in which the terminal is located is blindly detected.

The embodiment of the present invention further provides a terminal, including the foregoing downlink control information detecting apparatus.

The embodiment of the present invention provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to implement the downlink control information sending method provided by the foregoing one or more technical solutions, or The downlink control information detecting method provided by one or more of the foregoing embodiments is implemented.

The embodiments of the present invention are various forms of storage media, and may include: a storage medium such as a random storage medium, a read-only storage medium, a flash memory, a mobile hard disk, an optical disk, a USB disk, or the like, and may be a non-transitory storage medium.

The computer executable code can be a computer program or a software application.

While the embodiments of the present invention have been described above, the described embodiments are merely for the purpose of understanding the invention and are not intended to limit the invention. Modifications made in accordance with the principles of the invention are understood to fall within the scope of the invention.

Industrial applicability

In the embodiment of the present invention, a group downlink control information that is scrambled by using a temporary identifier of a group radio network is provided, where the physical downlink channel directly transmits group downlink control information for a user group. Such a DCI will be received by multiple users in a user group, which reduces the number of DCIs compared to the DCI sent by each user individually, reduces the overhead of DCI, and has a positive industrial effect. At the same time, it is easy to implement and can be widely used in industry.

Claims

A downlink control information sending method includes:

Determining, by the base station, a group radio network temporary identifier of the user group where the terminal is located, and performing cyclic redundancy check scrambling on the group downlink control information of the user group where the terminal is located by using the group radio network temporary identifier;

And transmitting the grouped downlink control information to the terminal by using the physical downlink control channel.
The method of claim 1 wherein

Determining, by the base station, the group radio network temporary identifier of the user group in which the terminal is located includes: determining, by the base station, the group radio network temporary identifier of the user group where the terminal is located, according to the mapping relationship information between the pre-configured group related information and the group radio network temporary identifier .
The method according to claim 2, wherein the method further comprises: the base station transmitting the mapping relationship information to the terminal by using a radio resource control signaling or a system message; or the base station and the terminal The mapping relationship information is pre-agreed.
The method according to claim 2, wherein the group related information comprises at least one of: beam information of a beam carrying the group of downlink control information, a radio frame number of a radio frame carrying the group of downlink control information, a slot number of a time slot carrying the group downlink control information, a subframe number of a subframe carrying the group downlink control information, and subband information of a downlink control channel carrying the group downlink control information, and the group Subband information of the downlink traffic channel related to the downlink control information, subcarrier spacing information of the downlink control channel carrying the group downlink control information, subcarrier spacing information of the downlink traffic channel related to the group downlink control information, and a bearer station The slot structure information of the predefined transmission time unit of the group downlink control information.
A downlink control information sending apparatus includes:

a group radio network temporary identifier determining unit configured to determine a group radio network temporary identifier of the user group where the terminal is located;

The processing unit is configured to perform cyclic redundancy check scrambling on the group downlink control information of the user group where the terminal is located by using the group radio network temporary identifier;

The sending unit is configured to send the scrambled group downlink control information to the terminal by using a physical downlink control channel.
The apparatus according to claim 5, wherein

The group radio network temporary identifier determining unit determines that the group radio network temporary identifier of the user group where the terminal is located includes:

The group wireless network temporary identifier of the user group in which the terminal is located is determined according to the mapping relationship information between the group-related information and the group wireless network temporary identifier.
The apparatus of claim 6, wherein the transmitting unit is further configured to transmit the mapping relationship information to the terminal by radio resource control signaling or a system message.
The apparatus according to claim 6, wherein the group related information comprises at least one of: beam information of a beam carrying the group of downlink control information, a radio frame number of a radio frame carrying the group of downlink control information, a slot number of a time slot carrying the group downlink control information, a subframe number of a subframe carrying the group downlink control information, and subband information of a downlink control channel carrying the group downlink control information, and the group Subband information of the downlink traffic channel related to the downlink control information, subcarrier spacing information of the downlink control channel carrying the group downlink control information, subcarrier spacing information of the downlink traffic channel related to the group downlink control information, and a bearer station The slot structure information of the predefined transmission time unit of the group downlink control information.
A base station comprising the downlink control information transmitting apparatus according to any one of claims 5 to 8.
A downlink control information detecting method includes:

The terminal acquires the group wireless network temporary identifier, uses the set of the wireless network temporary identifier to perform blind detection on the physical downlink control channel search space, and obtains the group downlink control information of the user group where the terminal is located.
The method of claim 10, wherein the acquiring the group wireless network temporary identifier by the terminal comprises: determining, by the terminal, the mapping relationship information between the group related information and the group wireless network temporary identifier, determining the user group where the terminal is located Group wireless network temporary identity.
The method of claim 11, wherein the method further comprises: the terminal acquiring the mapping relationship information by: the terminal receiving the mapping relationship information from the base station, or the terminal and The base station pre-agreed the mapping relationship information.
The method of claim 12, wherein the receiving, by the terminal, the mapping relationship information from the base station comprises: receiving, by the terminal, the mapping relationship information that is sent by the base station by using a radio resource control signaling or a system message.
The method according to claim 11, wherein the group related information comprises at least one of: current beam information, current radio frame number, current slot number, current subframe number, subband information of the current downlink control channel, The subband information of the current downlink traffic channel, the subcarrier spacing information of the current downlink control channel, the subcarrier spacing information of the current downlink traffic channel, and the slot structure information of the current predefined transmission time unit.
The method of claim 10, wherein the acquiring the group wireless network temporary identifier by the terminal comprises: receiving, by the terminal, a candidate group wireless network temporary identifier set configured by the base station by using radio resource control signaling, and acquiring the group wireless network temporary Identify each group of wireless network temporary identifiers in the set;

The group uses the wireless network temporary identifier to perform blind detection on the search space of the physical downlink control channel, and the group downlink control information of the user group where the terminal is located includes:

The terminal uses the group radio network temporary identifier in the candidate group radio network temporary identifier set to perform blind detection on the search space of the physical downlink control channel, and obtains group downlink control information of the user group where the terminal is located.
The method of claim 10, wherein said using said set of wireless network temporary identifiers for blind detection in a search space of a physical downlink control channel comprises:

Performing blind detection on the search space corresponding to the entire physical downlink control channel configured by the base station through radio resource control signaling;

Or performing blind detection on the search space corresponding to the downlink control information of the group that is semi-statically configured by the radio resource control signaling;

or,

The terminal receives a mapping relationship between the temporary identifier of the group wireless network and the search space that is configured by the base station by using the radio resource control signaling, and determines, according to the mapping relationship, a search corresponding to the temporary identifier of the group wireless network of the user group where the terminal is located. The space is blindly detected in a search space corresponding to the group wireless network temporary identifier of the user group where the terminal is located.
A downlink control information detecting apparatus includes:

a group radio network temporary identifier obtaining unit configured to acquire a group radio network temporary identifier;

The blind detection unit is configured to use the set of the wireless network temporary identifier to perform blind detection on the search space of the physical downlink control channel, and obtain group downlink control information of the user group where the terminal is located.
The apparatus of claim 17, wherein the group wireless network temporary identifier acquisition unit acquires the group wireless network temporary identifier comprises:

And determining, according to the mapping relationship information between the group related information and the group wireless network temporary identifier, the group wireless network temporary identifier of the user group where the terminal is located.
The device according to claim 18, wherein the group radio network temporary identifier obtaining unit is further configured to acquire the mapping relationship information according to the following manner: receiving the mapping relationship information from a base station, or pre-arranging with the base station The mapping relationship information.
The apparatus according to claim 19, wherein the receiving, by the group, the wireless network temporary identifier acquiring unit, the mapping relationship information from the base station comprises: receiving the mapping relationship information that is sent by the base station by using a radio resource control signaling or a system message. .
The apparatus according to claim 18, wherein said group related information comprises one or a combination thereof: current beam information, current radio frame number, current slot number, current subframe number, The sub-band information of the current downlink control channel, the sub-band information of the current downlink traffic channel, the sub-carrier spacing information of the current downlink control channel, the sub-carrier spacing information of the current downlink traffic channel, and the slot structure information of the current predefined transmission time unit.
The apparatus according to claim 17, wherein the group radio network temporary identifier acquisition unit acquires the group radio network temporary identifier comprises: receiving a candidate group radio network temporary identifier set configured by the base station by using radio resource control signaling, acquiring the group Each group of wireless network temporary identifiers in the wireless network temporary identification set;

The blind detection unit uses the set of radio network temporary identifiers to perform blind detection on the search space of the physical downlink control channel, and the group downlink control information of the user group in which the terminal is located includes:

The blind detection unit uses the group radio network temporary identifier in the candidate group radio network temporary identifier set to perform blind detection on the physical downlink control channel search space until the group downlink control information of the user group in which the terminal is located is obtained.
The apparatus according to claim 17, wherein the blind detection unit performs blind detection on a search space of the physical downlink control channel, including:

Performing blind detection on the search space corresponding to the entire physical downlink control channel configured by the base station through radio resource control signaling;

Or performing blind detection on the search space of the corresponding group downlink control information that is semi-statically configured by the base station by using the radio resource control signaling;

or,

Receiving, by the base station, a mapping relationship between the temporary identifiers of the group wireless network and the search space that are semi-statically configured by the radio resource control signaling, and determining, according to the mapping relationship, a search space corresponding to the temporary identifier of the group wireless network of the user group where the terminal is located, The search space corresponding to the group radio network temporary identifier of the user group in which the terminal is located is blindly detected.
A terminal, wherein the terminal comprises the downlink control information detecting device according to any one of claims 17 to 23.
A computer storage medium having stored therein computer executable instructions for performing the method of any one of claims 1 to 4 and 10 to 16.