CN108631969B

CN108631969B - Indication information sending method, indication information receiving method, base station and terminal

Info

Publication number: CN108631969B
Application number: CN201710169045.5A
Authority: CN
Inventors: 柯颋; 侯雪颖; 胡丽洁; 刘建军; 夏亮; 董静
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2017-03-21
Filing date: 2017-03-21
Publication date: 2021-01-15
Anticipated expiration: 2037-03-21
Also published as: CN108631969A

Abstract

The invention provides a sending method, a receiving method, a base station and a terminal of indication information, wherein the sending method comprises the following steps: determining a control channel according to the predetermined time domain resource and frequency domain resource; and sending indication information in the control channel, wherein the indication information is used for indicating the use condition of a preset time-frequency resource before the control channel. The receiving method comprises the following steps: receiving indication information on a control channel, wherein the indication information is used for indicating the use condition of a preset time-frequency resource before the control channel; and determining the use condition of a preset time-frequency resource before the control channel according to the indication information. The scheme of the invention can solve the problem of the deterioration of the downlink channel quality measurement and the downlink data demodulation performance caused by multi-service time division multiplexing.

Description

Indication information sending method, indication information receiving method, base station and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method for sending and receiving indication information, a base station, and a terminal.

Background

In the 5G system design, it is necessary to support multiple services with respective obvious features, including enhanced Mobile internet (eMBB), Ultra high reliability and Ultra Low Latency Communication (URLLC), and mass internet of things Communication (mtc).

The eMBB has corresponding requirements for peak rate and user experience rate, but may not be latency sensitive. URLLC services require ultra-high transmission reliability and lower latency data transmission, which may require shorter transmission time intervals TTI in the time domain than eMBB services to achieve fast scheduling and transmission.

The 5G system allows multiple services to be multiplexed on the same carrier, and the multiplexing mode may be frequency division multiplexing (FDM, see fig. 1a), or time division multiplexing (TDM, see fig. 1b), or time-frequency hybrid multiplexing (Mixed, see fig. 1 c).

Time division multiplexing scenario (FDM, see fig. 1a), and time division multiplexing part in time-frequency hybrid multiplexing scenario (Mixed, see fig. 1 c).

Different services participating in the multiplexing may employ the same or different system parameters (e.g., numerology). Thus, the multi-service multiplexing in fig. 1a, b, c may have different implementations.

The following description will be made by taking a time division multiplexing scenario as an example.

Case 1. different services participating in multiplexing use the same system parameters. For example, in the present embodiment, the eMBB and URLLC services both use a Subcarrier bandwidth (SCS) of 15kHz, and therefore the OFDM symbol sizes of both are the same.

To support different delay sensitivities, the eMBB and URLLC services employ different time domain scheduling unit lengths. For example, the eMBB service uses slots (slots) as a minimum time domain scheduling unit, where 1 slot includes k1 OFDM symbols, where k1 is a positive integer, e.g., k1 is 7,14, and so on. And the URLLC traffic uses mini-slots as minimum time domain scheduling units, where 1 mini-slot contains k2 OFDM symbols, where k2 is a positive integer, and 1 ≦ k2 ≦ k1, e.g., k2 ≦ 1,2,7, etc. Because the minimum time domain scheduling unit length of the URLLC service is smaller than that of the eMBB service, the URLLC service is possible to achieve faster scheduling and transmission.

In particular, fig. 2 presents a schematic view of an embodiment of the above-described case 1. The eMBB service and the URLLC service use the same system parameters, for example, OFDM symbols are generated based on 15kHz SCS. The difference is that the minimum time domain scheduling unit length of the eMBB service is slot, and in this embodiment, 1 slot length is 7 OFDM symbols; the minimum time domain scheduling unit length of the URLLC service is mini-slot, and in this embodiment, 1 mini-slot length is 2 OFDM symbols. And URLLC traffic may start transmission at any certain location or at certain locations in any or certain slots of eMBB traffic.

Note that the OFDM symbol referred to herein refers to a generalized OFDM symbol including a CP (Cyclic Prefix).

Case 2-different services participating in the multiplexing may also use different system parameters. For example, in the present embodiment, the eMBB service uses SCS of 15kHz, and the URLLC service uses SCS of 60kHz, so that the OFDM symbol sizes of the two are different.

Fig. 3 shows a service multiplexing method when the eMBB and URLLC services use different system parameters. The eMBB service adopts 15kHz SCS, the URLLC service adopts 60kHz SCS, therefore, the OFDM symbol length of the URLLC service is about 1/4 of the OFDM symbol length of the eMBB service, when the time domain scheduling units of the eMBB service and the URLLC service adopt the same OFDM symbol number, the absolute time length of the time domain scheduling unit of the URLLC service is shorter, and therefore the URLLC service is more likely to realize faster scheduling and transmission compared with the eMBB service.

Of course, even if different system parameters are adopted, the URLLC service can adopt mini-slot containing fewer OFDM symbols as the minimum time domain scheduling unit.

Note also that the OFDM symbol referred to herein refers to a generalized OFDM symbol including a CP (Cyclic Prefix).

Regardless of the manner in which the base station multiplexes several traffic types, a particular user may only understand a few, or even only one, traffic type, and the other traffic types transmitted by the base station are unknown to the user. Furthermore, the user cannot determine whether the unknown service exists and how much time-frequency resources it occupies by demodulating the control channel of the unknown service.

For example, as shown in fig. 4, it is not assumed that the UE1 with the base station scheduled the eMBB service first performs downlink transmission in slot 1. Then, in a certain time frequency resource (resource set 1) in the middle of slot 1, the base station is changed to serve the URLLC service. That is, in resource set 1, the base station does not send the DL information (such as the downlink data channel, the downlink control channel, or the downlink reference signal) of the eMBB service, but instead sends or receives the DL or UL information (such as the uplink and downlink data channel, the uplink and downlink control channel, or the uplink reference signal) of the URLLC service.

Assuming that the UE1 can only understand the eMBB traffic and cannot demodulate the control channel of URLLC traffic, it is difficult for the UE1 to actively recognize whether resource set 1 has been stolen for other use unless notified by the base station.

Further, if the UE1 erroneously assumes that resource set 1 is still used for transmitting the eMBB service and performs service operations such as downlink channel quality (CSI) measurement, downlink data demodulation, and the like for the eMBB service based on the above-mentioned erroneous understanding, the corresponding downlink CSI measurement and downlink data demodulation performance may be significantly deteriorated.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a sending method, a receiving method, a base station and a terminal for indicating information, which can solve the problem of downlink channel quality measurement and downlink data demodulation performance deterioration caused by multi-service time division multiplexing.

In order to solve the above technical problem, an embodiment of the present invention provides a method for sending indication information, including:

determining a control channel according to the predetermined time domain resource and frequency domain resource;

and sending indication information in the control channel, wherein the indication information is used for indicating the use condition of a preset time-frequency resource before the control channel.

Wherein the step of determining a control channel comprises:

determining a time domain resource, and determining a first time domain resource for carrying the control channel in the time domain resource;

and determining a frequency domain resource, and determining a first frequency domain resource for carrying the control channel in the frequency domain resource.

Wherein the step of determining a time domain resource comprises: determining at least one minimum time domain scheduling unit as the time domain resource;

the step of determining a frequency domain resource comprises: and determining at least one preset carrier as the frequency domain resource.

Wherein, in the time domain resources, the step of determining the first time domain resources comprises:

in the at least one minimum time domain scheduling unit, using the first n1 available time domain resources for downlink transmission of each time domain resource with downlink transmission as a first time domain resource for carrying a control channel, wherein n1 is a positive integer greater than or equal to 1; or

In the at least one minimum time domain scheduling unit, the last n2 available time domain resources for downlink transmission of each time domain resource for downlink transmission are used as the first time domain resource for bearing a control channel; wherein n2 is a positive integer greater than or equal to 1; or

In a minimum time domain scheduling unit group consisting of the at least one minimum time domain scheduling unit, taking the first n1 available OFDM symbols for downlink transmission in the time domain resources for downlink transmission in the first minimum time domain scheduling unit as the first time domain resources for carrying the control channel, wherein n1 is a positive integer greater than or equal to 1; or

In a minimum time domain scheduling unit group consisting of the at least one minimum time domain scheduling unit, the last n2 available time domain resources for downlink transmission in the last minimum time domain scheduling unit are used as the first time domain resources for bearing the control channel; or

In the at least one minimum time domain scheduling unit, each minimum time domain scheduling unit scheduled for downlink transmission is used as a first time domain resource for bearing a control channel; or

In the minimum time domain scheduling unit group composed of the at least one minimum time domain scheduling unit, the last minimum time domain scheduling unit scheduled for downlink transmission is used as a first time domain resource for bearing a control channel; or

In the at least one minimum time domain scheduling unit, taking each minimum time domain scheduling unit containing a preset downlink reference signal as a first time domain resource for bearing a control channel; or

And in a minimum time domain scheduling unit group consisting of the at least one minimum time domain scheduling unit, taking the last minimum time domain scheduling unit containing a preset downlink reference signal as a first time domain resource for bearing a control channel.

Wherein the step of determining a first frequency domain resource among the frequency domain resources comprises:

the step of determining a first frequency domain resource among the frequency domain resources comprises:

in the at least one preset carrier, taking a control resource set of a preset member carrier as a first frequency domain resource for bearing a control channel; wherein, the frequency domain position of the preset member carrier is configured in advance;

or each control resource set in a control resource set group consisting of the control resource sets of each member carrier in the at least one preset carrier is used as a first frequency domain resource for bearing a control channel;

or in a control resource set group consisting of control resource sets in each member carrier of the at least one preset carrier, the selected control resource set is used as a first frequency domain resource for bearing a control channel;

or in the at least one preset carrier, taking downlink scheduling resources of each terminal scheduled for downlink transmission as first frequency domain resources for bearing a control channel;

or in the at least one preset carrier, selecting one downlink scheduling resource from the downlink scheduling resources of the terminal scheduled for downlink transmission as the first frequency domain resource for carrying the control channel.

The base station and the terminal determine the frequency domain resource allocation of the control resource set group through at least one parameter of the period, the initial frequency domain offset and the number of resource blocks of each control resource set.

The base station and the terminal agree on the at least one parameter through a preset protocol; or the base station informs the terminal of the at least one parameter through at least one of system information, Radio Resource Control (RRC) signaling and DCI signaling.

In the foregoing method, the selecting of the control resource set for carrying the control channel includes:

and a preset downlink reference signal or downlink transmission scheduling of a preset user exists in a range of +/-k 1MHz near the selected control resource set, wherein k1 is a positive integer.

Wherein the presetting of the downlink reference signal comprises: at least one of a reference signal usable for downlink synchronization, a reference signal usable for channel measurement, a reference signal usable for phase noise measurement, a reference signal usable for scanning beam measurement, a reference signal usable for cross-link interference measurement, a reference signal usable for cell discovery, a reference signal usable for Radio Resource Management (RRM) measurement, and a reference signal usable for user positioning.

And if no control resource set exists in the range of +/-k 2MHz near downlink scheduling resources of the terminal scheduled for downlink transmission, selecting at least one downlink scheduling resource as a first frequency domain resource for bearing the control channel, wherein k2 is a positive integer.

Wherein the indication information is carried in downlink control information, DCI, carried in the control channel.

Wherein the DCI carried by the control channel comprises: at least one of a first DCI for indicating the integrity of the time-frequency resources and a second DCI for indicating a location of an invalid time-frequency resource preceding the control channel.

The second DCI includes: a set of consecutive time-frequency resource indication fields;

wherein, the continuous time-frequency resource indication field only comprises a time-domain resource indication field, and the specific time-domain resource indication method can adopt any one of the following indication modes:

the first method comprises the following steps: an OFDM symbol offset indication, wherein the OFDM symbol offset is determined with respect to a second DCI;

and the second method comprises the following steps: a minimum time domain scheduling unit offset indication and an OFDM symbol offset indication, wherein the minimum time domain scheduling unit offset is determined relative to the second DCI, and the OFDM symbol offset is determined relative to the minimum time domain scheduling unit offset where the OFDM symbol offset is located;

and the third is that: the minimum time domain scheduling unit offset is determined relative to the second DCI, and the OFDM symbol offset is determined relative to the minimum time domain scheduling unit offset in which the OFDM symbol offset is located.

wherein, the continuous time-frequency resource indication field comprises a time-domain resource indication field and a frequency-domain resource indication field at the same time;

the indication method can adopt any one of the following indication modes:

the first method comprises the following steps: an OFDM symbol offset indication and a frequency domain resource indication, wherein the OFDM symbol offset is determined with respect to a second DCI;

and the second method comprises the following steps: a minimum time domain scheduling unit offset indication, and at least one second field, the second field comprising: an OFDM symbol offset indication and a frequency domain resource indication, wherein the minimum time domain scheduling unit offset is determined with respect to the second DCI, and the OFDM symbol offset is determined with respect to the minimum time domain scheduling unit offset in which the OFDM symbol offset is located;

and the third is that: the minimum time domain scheduling unit offset indication, the OFDM symbol number and the frequency domain resource indication, wherein the minimum time domain scheduling unit offset is determined relative to the second DCI, and the OFDM symbol offset is determined relative to the minimum time domain scheduling unit offset where the OFDM symbol offset is located.

Wherein the step of transmitting the indication information in the control channel comprises:

when the base station determines that the current minimum time domain scheduling unit is intact, the base station sends first DCI; otherwise, transmitting at least one second DCI; or

When the base station determines that the resources of a minimum time domain scheduling unit group consisting of at least one minimum time domain scheduling unit are intact, the base station sends first DCI; otherwise, transmitting at least one second DCI; or

When the base station determines that the current minimum time domain scheduling unit is intact, the base station sends first DCI; otherwise, when the base station determines that the current minimum time domain scheduling unit is not intact, the base station sends the first DCI and at least one second DCI;

or when the base station determines that the resources of the minimum time domain scheduling unit group consisting of at least one minimum time domain scheduling unit are intact, the base station sends the first DCI; and when the base station determines that the resources of the minimum time domain scheduling unit group consisting of the at least one minimum time domain scheduling unit are not all intact, the base station transmits the first DCI and the at least one second DCI.

The embodiment of the invention also provides a method for receiving the indication information, which comprises the following steps:

receiving indication information on a control channel, wherein the indication information is used for indicating the use condition of a preset time-frequency resource before the control channel;

and determining the use condition of a preset time-frequency resource before the control channel according to the indication information.

Wherein the step of receiving the indication information on the control channel comprises:

a terminal receives downlink scheduling information;

if the downlink scheduling information indicates that the user dedicated control channel exists, the terminal determines the time-frequency resource position of the user dedicated control channel and selects to monitor the indication information in the user dedicated control channel and/or the cell common control resource set; otherwise, when the downlink scheduling information indicates that no user dedicated control channel exists, the terminal monitors the indication information in the cell common control resource set.

Wherein, according to the indication information, the step of determining the use condition of the preset time-frequency resource before the control channel comprises:

if the indication information is first DCI used for indicating the integrity of the time-frequency resources, determining whether the time-frequency resource data is intact according to the first DCI;

and if the indication information is second DCI used for indicating the position of the invalid time-frequency resource before the control channel, determining the position of the invalid time-frequency resource according to the second DCI.

Wherein, determining the invalid time-frequency resource position according to the second DCI further comprises:

and the terminal feeds back the ACK/NACK information at the symbol group level consisting of at least one OFDM symbol or improves the data demodulation capacity based on the invalid time-frequency resource information.

determining whether a specific measurement result is valid or invalid in a current time domain scheduling unit; or

Modifying the specific measurement result in the current time domain scheduling unit; or

An average measurement is calculated based on the particular instantaneous measurements that are valid or that are valid after correction.

Wherein the control channel is determined according to predetermined time domain resources and frequency domain resources.

Wherein, the step of determining the control channel according to the predetermined time domain resource and frequency domain resource comprises:

In a minimum time domain scheduling unit group consisting of the at least one minimum time domain scheduling unit, taking a last minimum time domain scheduling unit containing a preset downlink reference signal as a first time domain resource for bearing a control channel; or

In the at least one preset carrier, taking a control resource set of a preset member carrier as a first frequency domain resource for bearing a control channel; wherein, the frequency domain position of the preset member carrier is configured in advance; or

Taking each control resource set in a control resource set group consisting of control resource sets of each member carrier in the at least one preset carrier as a first frequency domain resource for bearing a control channel; or

In a control resource set group consisting of control resource sets in each member carrier of the at least one preset carrier, using a selected control resource set as a first frequency domain resource for bearing a control channel; or

In the at least one preset carrier, taking downlink scheduling resources of each terminal scheduled for downlink transmission as first frequency domain resources for bearing a control channel; or

And in the at least one preset carrier, selecting one downlink scheduling resource from downlink scheduling resources of the terminal scheduled for downlink transmission as a first frequency domain resource for bearing a control channel.

Wherein the presetting of the downlink reference signal comprises: at least one of a reference signal usable for downlink synchronization, a reference signal usable for channel measurement, a reference signal usable for phase noise measurement, a reference signal usable for scanning beam measurement, a reference signal usable for cross-link interference measurement, a reference signal usable for cell discovery, a reference signal usable for Radio Resource Management (RRM) measurement, a reference signal usable for user positioning, and the like.

An embodiment of the present invention further provides an apparatus for sending indication information, including:

the determining module is used for determining a control channel according to the predetermined time domain resource and frequency domain resource;

and a sending module, configured to send indication information in the control channel, where the indication information is used to indicate a use condition of a preset time-frequency resource before the control channel.

An embodiment of the present invention further provides a base station, including:

a memory for storing a usage indicating a preset time-frequency resource before a control channel;

the processor is configured to perform the steps of: determining a control channel according to the predetermined time domain resource and frequency domain resource;

a transmitter configured to transmit the indication information in the control channel.

An embodiment of the present invention further provides an apparatus for receiving indication information, including:

a receiving module, configured to receive indication information on a control channel, where the indication information is used to indicate a use condition of a preset time-frequency resource before the control channel;

and the determining module is used for determining the use condition of the preset time-frequency resource before the control channel according to the indication information.

An embodiment of the present invention further provides a terminal, including:

a receiver for receiving indication information on a control channel, wherein the indication information is used for indicating the use condition of a preset time-frequency resource before the control channel;

a memory for storing the indication information;

a processor configured to perform the steps of: and determining the use condition of a preset time-frequency resource before the control channel according to the indication information.

The technical scheme of the invention has the following beneficial effects:

in the scheme, a control channel is determined according to predetermined time domain resources and frequency domain resources, and indication information for indicating the use condition of the preset time frequency resources before the control channel is sent in the control channel; therefore, the base station can explicitly indicate invalid resources, and the downlink channel quality measurement and the downlink data demodulation performance are ensured during multi-service time division multiplexing.

Drawings

Fig. 1a is a schematic diagram of multiplexing of multiple services on the same carrier, and a Frequency Division Multiplexing (FDM) multiplexing mode;

FIG. 1b is a schematic diagram of a multiplexing scheme for Time Division Multiplexing (TDM);

FIG. 1c is a schematic diagram of a multiplexing mode of time-frequency hybrid multiplexing (Mixed);

FIG. 2 is a schematic diagram of different services participating in multiplexing using the same system parameters;

FIG. 3 is a schematic diagram of different system parameters adopted by different services participating in multiplexing;

fig. 4 is a schematic diagram of a UE1 that schedules an eMBB service by a base station to perform downlink transmission in slot 1, and then the base station changes to serve a URLLC service in a certain time-frequency resource (resource set 1) in the middle of slot 1;

FIG. 5 is a flow chart illustrating a method for sending indication information according to the present invention;

FIG. 6 is a diagram of a control channel time domain resource location 1;

FIG. 7 is a diagram of control channel time domain resource location 2;

FIG. 8 is a diagram of a control channel time domain resource location 3;

FIG. 9 is a diagram of a control channel time domain resource location 4;

FIG. 10 is a diagram illustrating a control channel time domain resource location 5;

FIG. 11 is a diagram of a control channel time domain resource location 6;

FIG. 12 is a diagram of a control channel time domain resource location 7;

FIG. 13 is a diagram illustrating a control channel time domain resource location 8;

FIG. 14 is a diagram of a control channel time domain resource location 9;

FIG. 15 is a diagram illustrating a control channel time domain resource location 10;

FIG. 16 is a diagram illustrating control channel frequency domain resource location 1;

FIG. 17 is a diagram of control channel frequency domain resource location 2;

FIG. 18 is a diagram of control channel frequency domain resource location 3;

FIG. 19 is a diagram of a control channel frequency domain resource location 4;

FIG. 20 is a diagram of control channel frequency domain resource location 5;

FIG. 21 is a diagram of control channel frequency domain resource location 6;

FIG. 22 is a diagram of control channel frequency domain resource location 7;

FIG. 23 is a diagram of control channel frequency domain resource location 8;

FIG. 24 is a diagram illustrating control channel frequency domain resource location 9;

fig. 25 is a flowchart illustrating a method for receiving indication information according to the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

First embodiment

As shown in fig. 5, an embodiment of the present invention provides a method for sending indication information, including:

step 51, determining a control channel according to the predetermined time domain resource and frequency domain resource;

specifically, firstly, a time domain resource is determined, and a first time domain resource for carrying the control channel is determined in the time domain resource; determining a frequency domain resource, and determining a first frequency domain resource for carrying the control channel in the frequency domain resource;

determining at least one minimum time domain scheduling unit as the time domain resource; and determining at least one preset carrier as the frequency domain resource.

Step 52, sending indication information in the control channel, where the indication information is used to indicate a use condition of a preset time-frequency resource before the control channel;

the control channel may be a newly designed control channel or may be a control channel that multiplexes existing control channels, and the control channel may be at least one of a cell common control channel and a user dedicated control channel.

The embodiment of the present invention is implemented in a network side device, where the network side device may specifically be a base station, and the base station may be an eNB (a base station in a 4G system), a gNB (a base station in a 5G system), or other network devices.

In this embodiment of the present invention, the indication information may be carried in DCI (downlink control information), and the DCI is carried in a control channel;

the base station may transmit the DCI through only the cell-shared control channel or only the user-dedicated control channel or through both the cell-shared control channel and the user-dedicated control channel.

In the embodiment of the invention, a control channel is determined according to the predetermined time domain resource and frequency domain resource, and the indication information for indicating the use condition of the preset time frequency resource before the control channel is sent in the control channel; thereby allowing the base station to explicitly indicate the invalid resources. In multi-service time division multiplexing, for example, when eMBB service and URLLC time division multiplexing, it is assumed that UE1 can only understand the eMBB service but cannot demodulate the control channel of URLLC service, but in this embodiment, the base station sends indication information to the terminal, and through the specially designed explicit indication of the control channel, the terminal can be in the middle of eMBB service sending, if a URLLC service is sent in a certain time slot, the terminal can know the sending time slot position of the URLLC service or send the invalid time slot position of the eMBB service according to the indication information, the terminal can correctly receive the eMBB service and demodulate the eMBB service, and can further ensure the downlink channel quality measurement and downlink data demodulation performance.

Second embodiment

In a second embodiment of the present invention, a method for sending indication information is provided, where the method includes all the steps and implementation manners of the steps in the first embodiment; further, the method for determining the time domain resource location where the control channel is located includes:

the first method is as follows: as shown in fig. 6 and 8, in at least one minimum time domain scheduling unit, the first n1 available OFDM symbols for downlink transmission, each of which has a beginning of time domain resources for downlink transmission, are used as the first time domain resources for carrying the control channel 61, where n1 is a positive integer greater than or equal to 1.

Wherein, the first n1 available OFDM symbols for downlink transmission of the time domain resources for downlink transmission of the minimum time domain scheduling unit may be multiplexing legacy control channels, and the legacy control channels may be at least one of a cell common control channel and a user dedicated control channel; the traditional control channel is also used for carrying at least one DCI of DL scheduling DCI, UL scheduling authorization DCI, UL power control DCI and other DCIs; for example, in fig. 6 and 8, the base station transmits DCI in the control channel 61 to indicate the usage of a specific time-frequency resource in the previous minimum time-domain scheduling unit, such as k OFDM symbols shown by the shaded portion in the previous minimum time-domain scheduling unit are not available.

The second method comprises the following steps: as shown in fig. 7 and fig. 9, in the at least one minimum time domain scheduling unit, the last n2 available time domain resources each having downlink transmission are used for downlink transmission OFDM symbols as the first time domain resource for carrying the control channel 61; wherein n2 is a positive integer greater than or equal to 1. The last n2 available time domain resources for downlink transmission of the minimum time domain scheduling unit may be used to indicate a use condition of a preset time-frequency resource before the DCI in the current minimum time domain scheduling unit. For example, in fig. 7 and 9, the base station transmits DCI in a control channel 61 indicating that k OFDM symbols as indicated by the shaded portion in the current minimum time domain scheduling unit are unavailable.

The third method comprises the following steps: as shown in fig. 10, in the minimum time domain scheduling unit group composed of the at least one minimum time domain scheduling unit 62, the first time domain resources used for carrying the control channel 61 are n1 available OFDM symbols for downlink transmission from the beginning of the time domain resources used for downlink transmission in the first minimum time domain scheduling unit, where n1 is a positive integer greater than or equal to 1.

The method is as follows: as shown in fig. 11, in the minimum time domain scheduling unit group composed of the at least one minimum time domain scheduling unit 62, the last n2 available time domain resources for downlink transmission in the last minimum time domain scheduling unit are used as the first time domain resources for carrying the control channel 61.

The fifth mode is as follows: as shown in fig. 12, in the at least one minimum time domain scheduling unit, each minimum time domain scheduling unit scheduled for downlink transmission is used as a first time domain resource for carrying a control channel 61.

The method six: as shown in fig. 13, in the minimum time domain scheduling unit group composed of the at least one minimum time domain scheduling unit 62, the last minimum time domain scheduling unit to be scheduled for downlink transmission is used as the first time domain resource for carrying the control channel 61.

The method is as follows: as shown in fig. 14, in the at least one minimum time domain scheduling unit 62, each minimum time domain scheduling unit including a preset downlink reference signal 63 is used as a first time domain resource for carrying a control channel 61.

The method eight: as shown in fig. 15, in the minimum time domain scheduling unit group composed of the at least one minimum time domain scheduling unit 62, the last minimum time domain scheduling unit including the preset downlink reference signal 63 is used as the first time domain resource for carrying the control channel 61.

Wherein the presetting of the downlink reference signal comprises: at least one of reference signals (e.g., PSS, SSS) usable for downlink synchronization, reference signals (e.g., CSI-RS) usable for channel measurement, reference signals usable for phase noise (phase noise) measurement, reference signals usable for beam scanning (beam scanning) measurement, reference signals usable for Cross Link Interference (CLI) measurement, reference signals usable for cell discovery (e.g., PRS), reference signals usable for Radio Resource Management (RRM) measurement (e.g., discovery signal, CSI-RS, CRS), reference signals usable for user positioning (e.g., positioning RS), and the like.

In a second embodiment of the present invention, a method for sending indication information is provided, where the method includes all the steps and implementation manners of the steps in the first embodiment; further, the method for determining the frequency domain resource location where the control channel is located includes:

the first method is as follows: as shown in fig. 16, in the at least one predetermined Carrier, a control resource set (control resource set) of a predetermined Component Carrier (CC: Component Carrier) is used as a first frequency domain resource for carrying a control channel 61; and the frequency domain position of the preset member carrier is configured in advance. The component carrier may take a larger bandwidth, such as 20MHz, 80MHz, 100 MHz.

The second method comprises the following steps: as shown in fig. 17 and fig. 18, each control resource set in a control resource set group composed of control resource sets of each component carrier in the at least one preset carrier is used as a first frequency domain resource for carrying a control channel.

For example, assuming that the component carrier bandwidth is 20MHz, in each component carrier of 20MHz, the base station configures one control resource set group, where the control resource set group includes 4 control resource sets, and the starting frequency domain offset is X1MHz, and each control resource set includes N1 RBs. Therefore, in the present embodiment, the period is 20MHz/4 is 5 MHz.

Wherein, the base station and the terminal determine the frequency domain resource allocation of the control resource set group through at least one parameter of the period, the initial frequency domain offset and the number of Resource Blocks (RBs) of each control resource set. Or, the base station and the terminal appoint the at least one parameter through a preset protocol; or, the base station notifies the terminal of the at least one parameter through at least one of a system message, Radio Resource Control (RRC) signaling, and DCI signaling.

Wherein, the time frequency resource range indicated in different control resource sets can be the same or different.

In fig. 17, each control resource set indicates the time-frequency resource usage in the carrier packet where it is located; whereas in fig. 18, each control resource set indicates time-frequency resource usage in the entire component carrier.

In particular, when the indication information is only used for indicating the time-frequency resource usage, the DCI information contained in different control resource sets may be the same. Therefore, in this case, the base station repeatedly carries the same control information in each control resource set in the control resource set group.

The above-mentioned purpose of configuring multiple groups of control resource sets in one component carrier is to:

possibility 1: the time-frequency resource usage in different carrier wave groups is different. For example, as shown in fig. 17, the time-frequency resource usage is different between the 2 nd carrier packet and other carrier packets;

possibility 2: the UE processing capability is limited, i.e. it is assumed that some low-power terminals have a small operating bandwidth, i.e. they can listen to only a small range of frequency domain bandwidth at the same time. For example, suppose that each UE can listen to a bandwidth of 5MHz at maximum simultaneously. Then, in order to enable the low-power terminals with small bandwidth to quickly listen to the indication information, it is necessary to configure a control resource set carrying a control channel in the listening range of the UEs.

The third method comprises the following steps: and in a control resource set group consisting of control resource sets in each member carrier of the at least one preset carrier, taking the selected control resource set as a first frequency domain resource for bearing a control channel.

Here, the indication information may be used to assist the UE in improving DL data demodulation performance, improving performance based on specific downlink reference signal measurements, and/or improving performance of related subsequent processing affected based on the specific downlink reference signal measurements.

One example of the indication information for assisting the UE to improve the performance of the related subsequent processing affected based on the specific downlink reference signal measurement is as follows: for example, a UE for the eMBB service determines a DL channel quality for the eMBB service based on CSI-RS signal measurements for the eMBB service. It is assumed that part of CSI-RS signals lose transmission opportunity due to the corresponding time-frequency resource being preempted by other services (e.g., URLLC services), but if the UE for the eMBB service does not know this change and is still originally configured to detect CSI-RS signals at some invalid resource locations, it is apparent that the DL channel quality determined by the UE based on the CSI-RS signals detected at the invalid resource locations is distorted and problematic.

In order to avoid the above problem, the base station sends the indication information describing the use condition of the specific time-frequency resource. The UE determines the validity of each CSI-RS signal resource by receiving the indication information, and then can obtain a correct DL channel quality measurement result.

Likewise, the indication information may also be used to assist the UE in improving DL data demodulation performance.

In a fourth mode, as shown in fig. 19, a preset downlink reference signal exists or a downlink transmission schedule of a preset user exists in a range of ± k1MHz near the selected control resource set, where k1 is a positive integer.

When the indication information can be used to assist the UE to improve the performance of the related subsequent processing affected based on the specific downlink reference signal measurement, the base station does not carry the control channel in the control resource set when the specific downlink reference signal is not present in the carrier packet in which the control resource set is located.

Specifically, a base station determines whether a carrier packet in which a resource set is controlled needs to include a control channel by controlling whether a specific downlink reference signal exists within a range of ± k1MHz near the resource set;

corresponding UE side behavior:

UE firstly obtains the configuration of a control resource set group;

secondly, the UE determines the specific downlink reference signal configuration of interest thereof through other signaling (such as any one of system message, RRC signaling, and DCI signaling);

the UE can assume that the control resource set exists at a specific time-frequency resource in the vicinity of the specific downlink reference signal and determine a time-frequency resource location of the control resource set;

and the UE monitors the indication information describing the specific time-frequency resource use condition in the control resource set.

Here, the preset downlink reference signal 63 includes: at least one of reference signals (e.g., PSS, SSS) usable for downlink synchronization, reference signals (e.g., CSI-RS) usable for channel measurement, reference signals usable for phase noise (phase noise) measurement, reference signals usable for beam scanning (beam scanning) measurement, reference signals usable for Cross Link Interference (CLI) measurement, reference signals usable for cell discovery (e.g., discovery signal), reference signals usable for Radio Resource Management (RRM) measurement (e.g., discovery signal, CSI-RS, CRS), reference signals usable for user positioning (e.g., PRS: positioning RS).

When the indication information is available to assist the UE to improve DL data demodulation performance, the base station does not carry the control channel in the control resource set when there is no downlink data scheduling in the carrier packet in which the control resource set is located.

Specifically, a base station determines whether downlink data scheduling needs to be included in a carrier packet in which a resource set is controlled by controlling whether downlink transmission scheduling of a specific user exists within a range of +/-k 1MHz around the resource set;

corresponding UE side behavior:

UE firstly obtains the configuration of a control resource set group;

secondly, the UE determines the own downlink data scheduling resource through other signaling (such as DCI signaling);

and the UE determines the position of a control resource set corresponding to the downlink data scheduling resource and monitors the indication information describing the use condition of the specific time-frequency resource in the control resource set.

As shown in fig. 20, in the at least one preset carrier, the downlink scheduling resource of each terminal scheduled for downlink transmission is used as a first frequency domain resource for carrying a control channel 61.

A typical transmission location is that the control channel is carried on a time-frequency resource after the DL data transmission of each UE is finished.

Note that the control channel 61 and DL transmission data do not coincide. The control channel is the user dedicated control channel.

The base station firstly determines the time frequency resource positions used by DL transmission data and a control channel 61 respectively; the base station indicates the existence of a user dedicated control channel in the DL scheduling DCI; the UE determines the respective time-frequency resource locations used by the DL transmission data and the control channel 61 based on the DCI indication.

As shown in fig. 21, in the at least one preset carrier, one of downlink scheduling resources of a terminal scheduled for downlink transmission is selected as a first frequency domain resource for carrying a control channel.

Considering that some low-power terminals have small working bandwidth and limited processing capacity. When used for downlink data transmission, if a control resource set shared by cells is not configured in the listening range of these UEs, then as shown in fig. 20, the base station transmits the control channel in the downlink scheduling resources of these UEs, where the control channel 61 is the user-specific control channel; otherwise, the base station does not additionally configure the user dedicated control channel, so as to save control resource overhead.

The base station indicates whether the user dedicated control channel exists in DL scheduling DCI;

the UE determines the time-frequency resource position of a cell public control resource set; UE receives downlink scheduling DCI;

if the downlink scheduling DCI indicates that the user dedicated control channel exists, the UE determines the DL transmission data and the time-frequency resource position of the user dedicated control channel according to the method, and selects to monitor the indication information in the user dedicated control channel and/or the cell common control resource set. Preferably, the UE selects to listen to the indication information in a user dedicated control channel; otherwise, when the downlink scheduling DCI indicates that no user dedicated control channel exists, the UE monitors the indication information in the cell common control resource set.

And if no control resource set exists in the range of +/-k 2MHz near the downlink scheduling resource of the terminal scheduled for downlink transmission, using the control resource set as the resource for carrying the control channel, wherein k2 is a positive integer.

In the above embodiment of the present invention, the base station and the UE agree on the time-frequency resource location of the control channel, and the base station and the UE respectively determine the time-frequency resource location based on the agreement, wherein the agreement method includes stipulating through a standard protocol; or the base station determines the position of the control channel time-frequency resource and informs the UE through at least one method of system information, RRC signaling and DCI signaling.

In the same minimum time-frequency scheduling unit, the base station may only support one configuration method for controlling the time-frequency resource location of the channel, or the base station may also support multiple configuration methods for controlling the time-frequency resource location of the channel.

In the above embodiments of the present invention, the indication information is carried in downlink control information DCI, and the DCI is carried in the control channel.

The DCI includes: at least one of a first DCI for indicating the integrity of the time-frequency resources and a second DCI for indicating a location of an invalid time-frequency resource preceding the control channel.

The OFDM symbol offset may indicate only 1 symbol at a time or may indicate a plurality of symbols at a time.

Specifically, in order to indicate multiple symbols at a time, the OFDM symbol offset may be indicated in a bitmap manner, or may be indicated in other manners, for example, similar to an riv (resource indication value) indication method in LTE.

Wherein the second DCI comprises: a set of consecutive frequency domain resource indication fields may specifically adopt the provisions in existing protocols. Alternatively, the first and second electrodes may be,

wherein the second DCI comprises: a set of consecutive time-frequency resource indication fields; alternatively, the first and second electrodes may be,

the indication method can adopt any one of the following indication modes:

the first method comprises the following steps: an OFDM symbol offset indication, a frequency domain resource indication, wherein the OFDM symbol offset is determined with respect to a second DCI;

and the second method comprises the following steps: a minimum time domain scheduling unit offset indication and at least one second field, wherein the second field comprises an OFDM symbol offset indication and a frequency domain resource indication, the minimum time domain scheduling unit offset is determined relative to the second DCI, and the OFDM symbol offset is determined relative to the minimum time domain scheduling unit offset where the OFDM symbol offset is located;

The frequency domain resource indication may be indicated in various manners, such as in a manner of bitmap, or in other manners, such as similar to an riv (resource indication value) indication method in LTE.

When the base station determines that the current minimum time domain scheduling unit is intact, the base station sends first DCI; otherwise, when the base station determines that the current minimum time domain scheduling unit is not intact, the base station transmits first DCI and at least one second DCI, wherein the first DCI indicates that the data of the current minimum time domain scheduling unit is not intact, and the second DCI is used for indicating the service condition of the preset time domain resource, such as which OFDM symbols are invalid;

or when the base station determines that the resources of the minimum time domain scheduling unit group consisting of at least one minimum time domain scheduling unit are intact, the base station sends the first DCI; when the base station determines that resources of a minimum time domain scheduling unit group consisting of at least one minimum time domain scheduling unit are not all intact, the base station transmits a first DCI and at least one second DCI, wherein the first DCI indicates that the resources of the minimum time domain scheduling unit group are not all intact, and the second DCI is used for indicating the use condition of preset time domain resources, such as which OFDM symbols are invalid.

As shown in fig. 22, opt1 is to use only 1 second DCI, where the second DCI indicates that multiple sets of non-contiguous time-frequency resource invalidation conditions are indicated; and opt 2 is to use a plurality of second DCIs, wherein each second DCI only indicates a group of continuous time-frequency resource invalid cases.

After the terminal receives the DCI, the method for the UE to determine the use condition of the specific time frequency resource is as follows:

after the UE receives the first DCI, determining whether the data is intact according to a data integrity field in the first DCI;

alternatively, the UE determines whether the data is good by whether the first DCI can be correctly received. That is, if the UE can correctly receive the first DCI, it is determined that the data is intact; otherwise, if the UE cannot correctly receive the first DCI, the data is determined to be not intact.

When the UE receives the second DCI, determining an invalid time-frequency resource position;

when the UE cannot receive the first DCI and the second DCI, the UE determines that all resources are invalid.

As shown in fig. 23, one second DCI may indicate a plurality of invalid OFDM symbols, or one second DCI may indicate one invalid OFDM symbol or a group of consecutive OFDM symbols.

The continuous time-frequency resource indication field only comprises a time-frequency resource indication field, when the UE receives the second DCI, the UE determines the time-frequency position of the invalid time-frequency resource based on the received second DCI, and determines the position of the invalid time-frequency resource according to at least one preset rule as follows:

opt 3-1-1: all time-frequency resources corresponding to the time domain position on the current member carrier where the second DCI is located are invalid;

opt 3-1-2: all time-frequency resources corresponding to the time domain position on the current carrier grouping where the second DCI is located are invalid;

opt 3-1-3: in the range of + k3MHz near the control resource set where the second DCI is located, all time-frequency resources corresponding to the time domain position are invalid;

the base station and the UE can agree on the preset rule through the standard protocol regulation; or, the base station may notify the UE of the at least one preset rule by at least one of a system message, RRC signaling, and DCI signaling.

As shown in fig. 24, when the base station transmits at least one second DCI, if the preset time domain resource before the control channel includes a discontinuous preset number of invalid OFDM symbols, where the number of OFDM symbols spaced between the discontinuous preset OFDM symbols is smaller than a preset value, the second DCI indicates that the continuous preset number of OFDM symbols is invalid.

For example, the base station determines that for a particular service (e.g., eMBB service), the 2 nd, 3 rd, and 5 th (total 3) OFDM symbols are invalid. But to reduce the indication overhead, the base station indicates in the second DCI that the 2-5 (4 total) OFDM symbols are all invalid.

In the above embodiment of the present invention, the base station determines a control channel, which may be a multiplexed existing control channel or a specially designed control channel, and carries an indication information in the control channel to display an indication invalid resource, thereby solving the problem of degradation of downlink channel quality measurement and downlink data demodulation performance caused by multi-service time division multiplexing.

Third embodiment

It should be noted that the embodiment of the apparatus is an apparatus corresponding to the methods described in the first and second embodiments, and all the implementations in the embodiments of the method described above are applicable to the embodiment of the apparatus, and the same technical effects can be achieved.

Fourth embodiment

a processor configured to perform the steps of: determining a control channel according to the predetermined time domain resource and frequency domain resource;

In this embodiment of the base station, all implementations of the apparatus described in the third embodiment are included, and the memory, the processor, and the transmitter may be communicatively connected in a wired or wireless manner.

Fifth embodiment

As shown in fig. 25, an embodiment of the present invention further provides a method for receiving indication information, including:

251, receiving indication information in a control channel, where the indication information is used to indicate a use condition of a preset time-frequency resource before the control channel;

step 252, determining the use condition of the preset time-frequency resource before the control channel according to the indication information.

In the embodiment of the present invention, the terminal can correctly receive and demodulate the service data according to the use condition of the specific time frequency resource and can further correctly measure and feed back the channel quality according to the indication information.

Wherein step 251 may include:

a terminal receives downlink scheduling information; if the downlink scheduling information indicates that the user dedicated control channel exists, the terminal determines the time-frequency resource position of the user dedicated control channel and selects to monitor the indication information in the user dedicated control channel and/or the cell common control resource set; otherwise, when the downlink scheduling information indicates that no user dedicated control channel exists, the terminal monitors the indication information in the cell common control resource set.

Further, the step of determining the usage of the specific time-frequency resource before the control channel according to the indication information includes:

if the indication information is first DCI used for indicating the integrity of the time-frequency resources, determining that the time-frequency resources are intact according to the first DCI;

Further, in the method, after determining the invalid time-frequency resource location according to the second DCI, the terminal further includes: and the terminal feeds back the ACK/NACK information at the symbol group level consisting of at least one OFDM symbol or improves the data demodulation capacity based on the invalid time-frequency resource information.

For example, when the UE determines that there is an invalid RE in the received downlink data and the terminal supports demodulation capability of each OFDM symbol, feedback may be performed based on hole (transmit) information of an invalid time-frequency resource; to reduce feedback bits; for example, when [ 11X X11 ], 1(ACK) is fed back, where X represents that the OS is puncated.

When the terminal does not support the demodulation capability of each OFDM symbol, the data demodulation capability is improved based on the hole information.

Further, after determining the invalid time-frequency resource location according to the second DCI, the terminal may further include: determining whether a specific measurement result is valid or invalid in a current time domain scheduling unit; or modifying the specific measurement result in the current time domain scheduling unit; or an average measurement may be calculated based on the particular instantaneous measurement that is valid or modified to be valid. The measurement result here is a measurement based on a specific reference signal, and may include various measurement types. One embodiment is: and measuring the quality of a downlink channel based on the NR-CSI RS reference signal.

When the instantaneous measurement result needs to be reported, a validity tag (such as at least one of valid, invalid and corrected) can be further included in the report.

In this embodiment, the control channel is determined according to predetermined time domain resources and frequency domain resources.

Further, the step of determining the control channel according to the predetermined time domain resource and frequency domain resource includes:

Sixth embodiment

and the determining module is used for determining the use condition of the specific time frequency resource before the control channel according to the indication information.

It should be noted that the embodiment of the apparatus is an apparatus corresponding to the method described in the fifth embodiment, and all the implementation manners in the embodiment of the method described above are applicable to the embodiment of the apparatus, and the same technical effects can be achieved.

Seventh embodiment

An embodiment of the present invention further provides a terminal, including:

a memory for storing the indication information;

a processor configured to perform the steps of: and determining the use condition of the specific time frequency resource before the control channel according to the indication information.

The embodiment of the terminal of the present invention including the apparatus described in the sixth embodiment can achieve the same technical effects in the embodiment where all the implementations of the apparatus are applied to the terminal. In the terminal, the receiver, the memory, and the processor may be connected to each other through wired or wireless communication, for example, through a bus or the like.

In the above embodiment of the present invention, the base station and the UE agree on the time-frequency resource location of the control channel, and the base station and the UE respectively determine the time-frequency resource location based on the agreement, wherein the agreement method includes stipulating through a standard protocol; or, the base station determines the time-frequency resource position of the control channel and informs the UE through at least one method of system information, RRC signaling and DCI signaling;

the base station and the UE can determine the frequency domain resource allocation of the control resource set group through at least one parameter of the period, the starting frequency domain offset and the RB number of each control resource set;

the UE determines the time-frequency resource position of a cell public control resource set; UE receives downlink scheduling DCI; if the downlink scheduling DCI indicates that the user dedicated control channel exists, the UE determines the time-frequency resource position of the user dedicated control channel and selects to monitor the indication information in the user dedicated control channel and/or the cell common control resource set; otherwise, when the downlink scheduling DCI indicates that no user dedicated control channel exists, the UE monitors the indication information in the cell common control resource set.

The terminal of the invention can solve the problem of the quality measurement of the downlink channel and the degradation of the demodulation performance of the downlink data caused by the time division multiplexing of multiple services based on the technical scheme of the base station display indication invalid resource.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for sending indication information, comprising:

sending indication information in the control channel, wherein the indication information is used for indicating the use condition of a preset time-frequency resource before the control channel;

the indication information is carried in downlink control information, DCI, carried in the control channel; the DCI carried by the control channel comprises: at least one of a first DCI for indicating the time-frequency resource integrity and a second DCI for indicating a location of a useless time-frequency resource preceding the control channel.

2. The method of claim 1, wherein the step of determining a control channel comprises:

3. The method of claim 2,

the step of determining a time domain resource comprises: determining at least one minimum time domain scheduling unit as the time domain resource;

4. The method of claim 3, wherein the step of determining the first time domain resource among the time domain resources comprises:

5. The method of claim 2, wherein the step of determining the first frequency-domain resource among the frequency-domain resources comprises:

6. The method of claim 5, wherein the base station and the terminal determine the frequency domain resource configuration of the control resource set group by at least one of a period, a starting frequency domain offset, and a number of resource blocks per control resource set.

7. The method of claim 5, wherein the base station and the terminal agree on the at least one parameter through a predetermined protocol; or the base station informs the terminal of the at least one parameter through at least one of system information, Radio Resource Control (RRC) signaling and DCI signaling.

8. The method of claim 5, wherein the selection of the set of control resources for carrying the control channel comprises:

9. The method according to claim 4 or 8, wherein the predetermined downlink reference signal comprises: at least one of a reference signal usable for downlink synchronization, a reference signal usable for channel measurement, a reference signal usable for phase noise measurement, a reference signal usable for scanning beam measurement, a reference signal usable for cross-link interference measurement, a reference signal usable for cell discovery, a reference signal usable for Radio Resource Management (RRM) measurement, and a reference signal usable for user positioning.

10. The method of claim 5, wherein if there is no control resource set within ± k2MHz around downlink scheduling resources of a terminal scheduled for downlink transmission, at least one downlink scheduling resource is selected as the first frequency domain resource for carrying the control channel, where k2 is a positive integer.

11. The method of claim 1, wherein the second DCI comprises: a set of consecutive time-frequency resource indication fields;

12. The method of claim 1, wherein the second DCI comprises: a set of consecutive time-frequency resource indication fields;

the indication method can adopt any one of the following indication modes:

13. The method of claim 1, wherein the step of sending the indication information in the control channel comprises:

14. A method for receiving indication information, comprising:

determining the use condition of a preset time-frequency resource before the control channel according to the indication information;

15. The method of claim 14, wherein the step of receiving indication information on a control channel comprises:

a terminal receives downlink scheduling information;

16. The method according to claim 14, wherein the step of determining the usage of the preset time-frequency resource before the control channel according to the indication information comprises:

17. The method of claim 16, wherein determining invalid time-frequency resource locations according to the second DCI further comprises:

18. The method of claim 16, wherein determining invalid time-frequency resource locations according to the second DCI further comprises:

19. The method of claim 14, wherein the control channel is determined according to predetermined time domain resources and frequency domain resources.

20. The method of claim 19, wherein the step of determining the control channel according to the predetermined time domain resource and frequency domain resource comprises:

in at least one minimum time domain scheduling unit, using the initial n1 available OFDM symbols for downlink transmission, each of which has time domain resources for downlink transmission, as first time domain resources for carrying control channels, wherein n1 is a positive integer greater than or equal to 1; or

In at least one preset carrier, taking a control resource set of a preset member carrier as a first frequency domain resource for bearing a control channel; wherein, the frequency domain position of the preset member carrier is configured in advance; or

21. The method of claim 20, wherein the presetting the downlink reference signal comprises: at least one of a reference signal usable for downlink synchronization, a reference signal usable for channel measurement, a reference signal usable for phase noise measurement, a reference signal usable for scanning beam measurement, a reference signal usable for cross-link interference measurement, a reference signal usable for cell discovery, a reference signal usable for Radio Resource Management (RRM) measurement, a reference signal usable for user positioning, and the like.

22. An apparatus for transmitting indication information, comprising:

a sending module, configured to send indication information in the control channel, where the indication information is used to indicate a use condition of a preset time-frequency resource before the control channel;

the indication information is carried in downlink control information, DCI, carried in the control channel; the DCI carried by the control channel comprises: at least one of a first DCI for indicating the integrity of the time-frequency resources and a second DCI for indicating a location of an invalid time-frequency resource preceding the control channel.

23. A base station, comprising:

a transmitter for transmitting indication information in the control channel;

24. An apparatus for receiving indication information, comprising:

a determining module, configured to determine, according to the indication information, a use condition of a preset time-frequency resource before the control channel;

25. A terminal, comprising:

a memory for storing the indication information;

a processor configured to perform the steps of: determining the use condition of a preset time-frequency resource before the control channel according to the indication information;