CN111435869B

CN111435869B - Transmission method of downlink control channel, terminal and network side equipment

Info

Publication number: CN111435869B
Application number: CN201910028441.5A
Authority: CN
Inventors: 王磊
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2021-08-10
Anticipated expiration: 2039-01-11
Also published as: WO2020143617A1; CN111435869A

Abstract

The embodiment of the invention provides a transmission method of a downlink control channel, a terminal and network side equipment, wherein the method comprises the following steps: the terminal receives indication information sent by network side equipment, wherein the indication information is used for indicating the repeated transmission times of a downlink control channel and/or indicating whether to start a repeated transmission mode of the downlink control channel; and the terminal receives the downlink control channel according to the indication information. The embodiment of the invention can improve the transmission reliability of the downlink control channel.

Description

Transmission method of downlink control channel, terminal and network side equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a transmission method of a downlink control channel, a terminal, and a network side device.

Background

With the development of communication technology, the service of communication systems (such as: 5G system) has higher and higher reliability requirements, for example: high reliability Low Latency Communications (URLLC) services require extremely high reliability. However, the current communication system often supports single transmission of the downlink control channel, and cannot support repeated transmission of the downlink control channel, so that the transmission reliability of the communication system is poor.

Disclosure of Invention

The embodiment of the invention provides a transmission method of a downlink control channel, a terminal and network side equipment, which aim to solve the problem of poor transmission reliability caused by the fact that a communication system does not support repeated transmission of the downlink control channel.

The embodiment of the invention provides a transmission method of a downlink control channel, which comprises the following steps:

the terminal receives indication information sent by network side equipment, wherein the indication information is used for indicating the repeated transmission times of a downlink control channel and/or indicating whether to start a repeated transmission mode of the downlink control channel;

and the terminal receives the downlink control channel according to the indication information.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication Information in a specific bit (bit) of DCI of a first Downlink Control Information format (DCI format); or

Indication information carried in a Media Access Control Unit (MAC CE); or

Indication information carried by Radio Resource Control (RRC) signaling.

Optionally, the group of common downlink control channels carries indication information of at least one terminal including the terminal;

the terminal receives the downlink control channel according to the indication information, and the method comprises the following steps:

and the terminal receives the downlink control channel according to the indication information of the terminal.

Optionally, the indication information of the terminal is used to indicate: the number of repeated transmission times of the downlink control channel and/or whether to start the repeated transmission mode of the downlink control channel;

and the indication information of the terminal is also used for indicating:

the number of times of retransmission and/or whether to start the retransmission mode of the downlink control channel is valid in the transmission period of the group common downlink control channel, or the number of times of retransmission and/or whether to start the retransmission mode of the downlink control channel is valid when the terminal successfully receives the group common downlink control channel next time and terminates.

Optionally, Frequency Domain Resource Allocation (FDRA) fields of the DCI are all 1, and the specific bit is N bits that are not utilized or reserved in the DCI, where N is an integer greater than or equal to 1.

Optionally, in a case that N is an integer greater than 1, a first part of bits of the specific bits is used to indicate that the DCI is used for scheduling of a non-Contention Random Access (CFRA) or for a repeat transmission indication of the downlink control channel or for other types of uses;

and the second part of bits of the specific bits are used for indicating the repeated transmission times of the downlink control channel and/or indicating whether to start the repeated transmission mode of the downlink control channel.

Optionally, the first part of bits are the first H bits of the specific bits, the second part of bits are one or more bits of the specific bits except the first H bits, and H is an integer smaller than N.

Optionally, the second part bit is further configured to indicate:

the number of repeated transmission and/or the effective time of whether to open the repeated transmission mode of the downlink control channel.

Optionally, the DCI format is a DCI format for data scheduling or a DCI format for fallback downlink scheduling.

Optionally, the number of repeated transmissions of the downlink control channel is a subset of a set of repeated times, where the set of repeated times is predefined for a protocol or configured for a high-level signaling.

Optionally, the number of times of retransmission of the retransmission mode is predefined by a protocol or configured by a high-level signaling; and/or

The number of repeated transmissions and/or the validity period of whether to start the repeated transmission mode of the downlink control channel is predefined by a high-level signaling configuration or a protocol.

The embodiment of the invention also provides a transmission method of the downlink control channel, which comprises the following steps:

the network side equipment sends indication information to the terminal, wherein the indication information is used for indicating the repeated transmission times of the downlink control channel and/or indicating whether to start the repeated transmission mode of the downlink control channel;

and the network side equipment transmits the downlink control channel according to the indication information.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

Indication information carried by the RRC signaling.

the network side device sends the downlink control channel according to the indication information, and the sending includes:

and the network side equipment sends the downlink control channel of the terminal according to the indication information of the terminal.

and the indication information of the terminal is used for indicating that the terminal is also used for indicating that:

Optionally, all FDRA domains of the DCI are 1, and the specific bit is N bits that are not utilized or reserved in the DCI, where N is an integer greater than or equal to 1.

Optionally, when N is an integer greater than 1, a first part of bits of the specific bits is used to indicate that the DCI is used for scheduling of a CFRA or for a repeat transmission indication of the downlink control channel or for other types of uses;

Optionally, the second part bit is further configured to indicate:

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

a first receiving module, configured to receive indication information sent by a network side device, where the indication information is used to indicate a number of times of retransmission of a downlink control channel and/or is used to indicate whether to start a retransmission mode of the downlink control channel;

and the second receiving module is used for receiving the downlink control channel according to the indication information.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

Indication information carried by the RRC signaling.

the second receiving module is configured to receive the downlink control channel according to the indication information of the terminal.

An embodiment of the present invention further provides a network side device, including:

a first sending module, configured to send indication information to a terminal, where the indication information is used to indicate a number of times of retransmission of a downlink control channel and/or is used to indicate whether to start a retransmission mode of the downlink control channel;

and the second sending module is used for sending the downlink control channel according to the indication information.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

Indication information carried by the RRC signaling.

the second sending module is configured to send the downlink control channel of the terminal according to the indication information of the terminal.

An embodiment of the present invention further provides a terminal, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the transceiver is configured to receive indication information sent by a network side device, where the indication information is used to indicate a number of times of retransmission of a downlink control channel and/or is used to indicate whether to start a retransmission mode of the downlink control channel;

the transceiver is further configured to receive the downlink control channel according to the indication information.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

Indication information carried by the RRC signaling.

the receiving, performed by the transceiver, the downlink control channel according to the indication information includes:

and receiving the downlink control channel according to the indication information of the terminal.

a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the transceiver is configured to send indication information to a terminal, where the indication information is used to indicate a number of times of retransmission of a downlink control channel and/or is used to indicate whether to start a retransmission mode of the downlink control channel;

the transceiver is further configured to transmit the downlink control channel according to the indication information.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

Indication information carried by the RRC signaling.

the sending, by the transceiver, the downlink control channel according to the indication information includes:

and the transceiver transmits the downlink control channel of the terminal according to the indication information of the terminal.

The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the method for transmitting a downlink control channel at a terminal side provided in the embodiment of the present invention, or the computer program, when executed by the processor, implements the steps in the method for transmitting a downlink control channel at a network side device side provided in the embodiment of the present invention.

In the embodiment of the invention, a terminal receives indication information sent by network side equipment, wherein the indication information is used for indicating the repeated transmission times of a downlink control channel and/or indicating whether to start a repeated transmission mode of the downlink control channel; and the terminal receives the downlink control channel according to the indication information. In this way, the indication information sent by the network side device can control the repeated transmission times and/or the repeated transmission mode of the downlink control channel, so as to improve the transmission reliability of the downlink control channel.

Drawings

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

fig. 2 is a flowchart of another transmission method for a downlink control channel according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a group common pdcch (group common pdcch) according to an embodiment of the present invention;

fig. 4 is a structural diagram of a terminal according to an embodiment of the present invention;

fig. 5 is a structural diagram of a network side device according to an embodiment of the present invention;

fig. 6 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 7 is a block diagram of another network-side device according to an embodiment of 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.

Referring to fig. 1, fig. 1 is a flowchart of a method for transmitting a downlink control channel according to an embodiment of the present invention, as shown in fig. 1, including the following steps:

101. the terminal receives indication information sent by a network side device, wherein the indication information is used for indicating the repeated transmission times of a downlink control channel and/or indicating whether to start a repeated transmission mode of the downlink control channel.

102. And the terminal receives the downlink control channel according to the indication information.

The indication information may indicate whether to turn on a retransmission mode of a Physical Downlink Control Channel (PDCCH) by 1bit, where, for example, 1 indicates turning on retransmission and 0 indicates turning off retransmission.

The indication information may indicate the number of repeated transmissions through one or more bits, for example: and 2 bits are used for indicating that the repetition times of the downlink control channel are 0, 1, 2 or 4, and the like.

In the embodiment of the present invention, when receiving the indication information, the terminal may determine the transmission frequency of the downlink control channel according to the indication of the indication information, or determine whether to start a repeat transmission mode of the downlink control channel. And under the condition of starting the repeated transmission mode, the downlink control channel can carry out repeated transmission, otherwise, only one transmission is carried out. In a case that the retransmission mode is turned on, the number of retransmission times of the downlink control channel may be the number of retransmission times indicated by the indication information. Of course, when the indication information only indicates to start the retransmission mode of the downlink control channel and does not indicate the number of retransmission times, the number of retransmission times of the downlink control channel may be a default or preset number of retransmission times.

And under the condition of starting the repeated transmission times, the terminal can combine and receive the same message repeatedly transmitted by the downlink control channel according to the indication information so as to prevent the terminal from receiving and combining the same message repeatedly transmitted for multiple times. Therefore, the terminal can reduce the complexity of receiving the downlink control channel according to the indication information. Of course, this is not limited, for example: in the repeat transmission mode indicating that the number of times of repeat transmission is multiple or the downlink control channel is turned on, the terminal may first attempt separate reception for each downlink control channel, and further perform combining and decoding for multiple transmissions if the downlink control channel is unsuccessful.

As an optional implementation, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

And indication information carried by the radio resource control RRC signaling.

In this embodiment, the flexibility of the indication information may be improved by carrying the indication information in the group of common downlink control channels, carrying the indication information in the MAC CE, or carrying the indication information in the RRC signaling. Of course, the indication information may also be transmitted to the terminal in other forms, which are not limited herein.

For example:

example 1: the network side device can inform the terminal of the repeated transmission times of the downlink control channel through the indication information carried in the MAC CE. The terminal can perform the merging reception of the downlink control channel according to the indication information carried in the MAC CE.

Another example is:

example 2: the network side device can also configure the indication information of the repeated transmission of the downlink control channel for the terminal through the RRC signaling. For example, the number of times of repeated transmission of the downlink control channel of the terminal is configured to be K times through RRC signaling. After receiving the high-level signaling, the terminal can perform combined reception on K times of downlink control channel transmission. However, the present invention is not limited to this embodiment. For example: the terminal may first attempt to receive the downlink control channel transmission separately for each time, and if the downlink control channel transmission fails, further perform combining and decoding on the multiple downlink control channel transmissions.

Preferably, the group common downlink control channel is a group common physical downlink control channel (group common PDCCH). For example: the indication information carried by the group of common downlink control channels can be valid for a group of terminals, and each terminal in the group of terminals receives the downlink control channels according to the indication information.

Therefore, the repeated transmission condition of the downlink control channels of a group of terminals can be respectively indicated through the indication information carried by the group common downlink control channel which is effective for a group of terminals. The complexity of indicating the repeated transmission condition of a plurality of terminals respectively is simplified.

For example:

example 3: the DCI carried by the group common PDCCH includes activation/deactivation information for repeated transmission of downlink control channels of multiple terminals (i.e., whether to start a repeated transmission mode of the downlink control channels), and the DCI uses an indication field of 1bit in the indication information to indicate whether the terminal starts the repeated transmission mode of the downlink control channels. Specifically, for example, when the 1bit indication field is equal to 1, it indicates that the retransmission mode of the downlink control channel is turned on, and when the 1bit indication field is equal to 0, it indicates that the retransmission mode of the downlink control channel is turned off.

Correspondingly, the number of retransmissions of the downlink control channel (here, the number of retransmissions is equal to H), is configured through a higher layer signaling, or is defined through a protocol. If the repeated transmission mode of the downlink control channel is started, the base station repeatedly transmits the downlink control channel for H times, and the terminal performs combined reception on the downlink control channel for H times; otherwise, the downlink control channel is only transmitted once.

As an optional implementation manner, the group of common downlink control channels carries indication information of at least one terminal including the terminal;

The group of common downlink control channels may carry indication information of multiple terminals, and the indication information of different terminals may be the same or different, which is not limited herein. Each terminal can respectively acquire one piece of corresponding indication information to determine the repeated transmission times of the downlink control channel and/or whether to start the repeated transmission mode, and performs repeated transmission of the downlink control channel according to the determined repeated transmission condition of the downlink control channel.

Therefore, the method can avoid independently sending a group common downlink control channel message to a plurality of terminals, thereby reducing the occupation of the group common downlink control channel and reducing the expense of sending the indication information to the plurality of terminals.

Further, the indication information of the terminal (the terminal performing the above steps) may be used to indicate: the number of repeated transmission times of the downlink control channel and/or whether to start the repeated transmission mode of the downlink control channel;

and the indication information of the terminal can also be used for indicating:

The determining, by the terminal, of the number of times of retransmission of the downlink control channel and/or whether to turn on the retransmission mode of the downlink control channel according to the indication information only in the transmission period of the group of common downlink control channels may mean that the terminal may recover the default retransmission mode of the downlink control channel or turn off the retransmission mode of the downlink control channel after exceeding the transmission period of the group of common downlink control channels.

In addition, the termination of the next successful reception of the group common downlink control channel may refer to determining, according to indication information carried by the group common downlink control channel, the number of times of retransmission of the downlink control channel and/or whether to start a retransmission mode of the downlink control channel before the terminal successfully receives the group common downlink control channel for the next time. When the group common downlink control channel is successfully received next time, the repeated transmission times of the downlink control channel and/or whether the repeated transmission mode of the downlink control channel is started can be determined according to the indication information carried by the group common downlink control channel. And modifying the repeated transmission state of the downlink control channel by the terminal in time through the indication information carried by the group of common downlink control channels.

In this embodiment, the timeliness of the indication information can be controlled, and the state of the terminal that performs repeated transmission on the downlink control channel can be changed in time, so that the timeliness of the indication information is improved.

As an optional implementation manner, all frequency domain resource allocation FDRA fields of the DCI are 1, and the specific bit is N bits that are not utilized or reserved in the DCI, where N is an integer greater than or equal to 1.

Wherein, the fact that all of the FDRA fields are 1 may indicate that the FDRA fields are not used, or indicate that the specific bit indicates the indication information, so that when the terminal analyzes that all of the FDRA fields are 1, the indication information may be determined according to bits in the specific bit.

Of course, the FDRA domain may have other values, and the like, and is not particularly limited herein.

In addition, the N bits can determine the state of the repeated transmission indicated by the N bits in a mode of protocol presetting, high-level signaling indication and the like.

For example, when N is equal to 1, it may be determined that the content of the 1bit is equal to 1 in a protocol preset manner, which indicates that a repeated transmission mode of the downlink control channel is started; and when the content of the 1bit is equal to 0, the repeated transmission mode of the downlink control channel is closed.

Further, in the case that N is an integer greater than 1, a first part of bits of the specific bits is used to indicate that the DCI is used for scheduling of a CFRA or for a repeat transmission indication of the downlink control channel or for other types of uses;

The other types of usage may be usage other than the scheduling of the CFRA and the repeated transmission indication of the downlink control channel, for example: the scheduling for other purposes is not limited to this, that is, the first part bit is not limited to distinguish the scheduling of the CFRA or the retransmission indication of the downlink control channel.

Therefore, the function of the DCI can be distinguished through the first part bit, and the function of the DCI is prevented from being mixed with the function of the existing CFRA scheduling.

Of course, the first part bits may also be set as the last H bits of the specific bits, and the second part bits are one or more bits of the specific bits except for the last H bits, which is not limited herein.

Optionally, the second part bit is further configured to indicate:

Wherein, the effective time may be a specific time length, for example: the duration may also refer to a time limit for failing when the DCI format is successfully received next time, so as to improve timeliness of the indication information carried by the DCI format.

Optionally, the DCI format is a DCI format for data scheduling or a DCI format for fallback (fallback) downlink scheduling.

The DCI format for data scheduling may be DCI format 1-0 or DCI format already defined in other communication systems. The DCI format for fallback downlink scheduling may be a DCI format newly introduced in the embodiment of the present invention, or a DCI format defined in a future communication system (e.g., a 5G communication system) for fallback downlink scheduling, so as to improve an application range of the DCI format.

In addition, the DCI format for data scheduling or the DCI format for fallback (fallback) downlink scheduling may also be scrambled by a Cell Radio Network Temporary Identifier (C-RNTI).

The DCI format 1-0 is exemplified as follows:

example 4: and the network side equipment indicates whether to start a repeated transmission mode of the downlink control channel through the DCI format 1-0 and informs the repeated transmission times. And the network side equipment transmits the downlink control channel according to the indication information in the DCI format 1-0.

Specifically, the FDRA fields in the DCI format 1-0 are all 1, and scrambling is performed through a C-RNTI corresponding to the terminal. Defining unused bits, namely reserved bits, of the last N bits carried in the DCI, and carrying at least the following two kinds of information:

the method comprises the steps that firstly, DCI type indication information is used for distinguishing whether the DCI is used for CFRA scheduling or PDCCH repetition mode indication;

second, an indication information field of the repeated transmission mode of the downlink control channel, which is used for indicating part or all of the following information:

the number of repeated transmissions of the downlink control channel;

duration of the number of repeated transmissions of the downlink control channel.

And after the DCI related to the repeated transmission mode of the downlink control channel is confirmed, omitting all other bit fields except the indication information field of the repeated transmission mode of the downlink control channel.

Specifically, the structure of DCI can be represented by the following table 1:

TABLE 1

Wherein R may be equal to N.

In this embodiment, if R is 10bit, H is 1bit, and L1 is 2bit, and the DCI format 1-0 does not include an indication field indicating the duration of the repeated transmission of the downlink control channel. The terminal analyzes bit domains in the DCI format 1-0 after detecting and receiving the DCI format 1-0 in a search space, if the FDRA domain is found to be all 1, first analyzing a first information domain in the last 10 bits, namely the first H bits in the R bits, if the state of the bit domain is 0, indicating that the DCI is used for CFRA, and obtaining related information of the CFRA according to the analysis mode of the CFRA; if the bit field state is 1, the DCI is used for indicating the repeated transmission mode of the downlink control channel of the terminal, and further analyzing an information field consisting of the 2 nd bit and the 3 rd bit in the last 10 bits to determine the repeated transmission times of the downlink control channel.

For example, the number of repeated transmissions is determined according to table 2 below:

TABLE 2

It should be noted that the length of the bit field and the number of repetitions corresponding to each state are not limited herein. The corresponding relationship between the bit field and the number of repeated transmissions in table 2 may be defined in a predefined manner by a protocol, or may be configured by RRC signaling. If the configuration is performed through the high-level signaling, any corresponding relation different from the table can be configured through the high-level signaling.

As an optional implementation manner, the number of repeated transmissions of the downlink control channel is a subset of a set of repeated times, where the set of repeated times is predefined by a protocol or configured by higher layer signaling.

For example, the repetition number set may include various situations of the number of repeated transmissions of the downlink control channel, such as: the set of repetition times comprises 4 subsets: repeat 0 times, repeat 1 times, repeat 2 times, repeat 4 times, etc. The number of repeated transmissions for any terminal on the downlink control channel may be any one of the 4 repetitions, i.e., a subset of the set of repetitions.

Of course, the repetition number set may also include other repetition numbers, and the repetition number set may also be represented in other forms besides numbers, which is not limited herein.

In this way, a subset of the repetition times can be selected from a plurality of repetition times predefined by a protocol or configured by a higher layer signaling as the repetition times of the downlink control channel, thereby reducing the complexity of the process of determining the repetition times of the downlink control channel and also reducing the overhead, because the indication information can be an index of the set of the repetition times.

Of course, the number of retransmissions of the retransmission pattern is either predefined by the protocol or configured by higher layer signaling.

In this way, the number of repeated transmissions of the repeated transmission mode can be set in a mode of protocol predefining or higher layer signaling configuration so as to expand the selection range of the number of repeated transmissions.

Optionally, the number of times of retransmission and/or the validity period of whether to start the retransmission mode of the downlink control channel is predefined for a higher layer signaling configuration or a protocol.

The validity period may include at least one of the number of repeated transmissions and/or an effective time, an invalid time, and an effective duration of whether to turn on the repeated transmission mode of the downlink control channel.

Therefore, the validity period of the indication message can be set in a high-level signaling configuration or protocol predefined mode, and the timeliness of the indication message is improved.

Referring to fig. 2, a flowchart of another method for transmitting a downlink control channel according to an embodiment of the present invention is shown in fig. 2, where the method includes the following steps:

201. the network side equipment sends indication information to the terminal, wherein the indication information is used for indicating the repeated transmission times of the downlink control channel and/or indicating whether to start the repeated transmission mode of the downlink control channel.

202. And the network side equipment transmits the downlink control channel according to the indication information.

The indication information is the same as the indication message received by the terminal in the embodiment of the method shown in fig. 1.

In addition, when the indication information indicates to start the retransmission mode of the downlink control channel, the network side device may repeatedly transmit the data scheduling message of the downlink control channel according to the number of repetitions of the downlink control channel.

In this embodiment, the number of times of repeated transmission in the process of transmitting the downlink control channel by the network side device is determined according to the indication of the indication message, so as to improve the reliability of the downlink control channel.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

Indication information carried by RRC signaling (RRC signaling).

Optionally, the second part bit is further configured to indicate:

It should be noted that, this embodiment is used as an implementation of the network side device corresponding to the embodiment shown in fig. 1, and a specific implementation thereof may refer to the relevant description of the embodiment shown in fig. 2, so that, in order to avoid repeated descriptions, the detailed description of this embodiment is not repeated, and the same beneficial effects may also be achieved.

The following describes an example of a transmission method of the downlink control channel with reference to steps executed by the terminal and the network side device.

Example 5:

assume that two terminals residing in the system are UE a and UE B. Due to the service requirement, there is a high requirement for reliability of data transmission, for example, UE a is a Vehicle-to-anything (V2X) terminal, a power grid (power grid) terminal, or an AR/VR (virtual reality/augmented reality) terminal. The base station dynamically adjusts the repeated transmission times of the downlink control channel according to the service condition and the channel condition reported by the terminal, so as to improve the transmission reliability of the downlink control channel.

The base station indicates the repeated transmission times of the data scheduling downlink control channels of the plurality of terminals through DCI carried on a group common downlink control channel (group common PDCCH). Specifically, the DCI includes N information fields (i.e., N indication information), each information field corresponds to one or more terminals, a correspondence between a terminal and a location of the information field is configured through RRC signaling, and a specific Radio Network Temporary Identity (RNTI) is used for scrambling, for example, scrambling through an R-RNTI. The size of the DCI is the same as the size of DCI format 1-0 transmitted in Common Search Space (CSS).

In this embodiment, the DCI carries bit fields (i.e., the above-mentioned indication information) of the number of repeated transmissions of the downlink control channels of the N terminals. And the byte length corresponding to each bit field is 2 bits, and the relationship between the 2-bit field and the repetition times of the downlink control channel is shown in the following table 3: 00 means that the downlink control channel does not need to be transmitted repeatedly, 01 means that 1 time needs to be repeated, 10 means that 2 times needs to be repeated, and 11 means that 4 times needs to be repeated.

TABLE 3

Bit field of repetition times of downlink control channel	Number of repetitions
		00	0
01	1
		10	2
11	4

Here, the length of the indication field of the number of repetitions of the downlink control channel and the number of repetitions corresponding to each state are not limited.

The above table 3 can be defined by the predefined manner of the protocol, and can also be configured by RRC signaling. The relationship between the state of the repetition number indication information of the downlink control channel and the repetition number is not limited at all, that is, the higher layer signaling may configure any corresponding relationship different from the above table.

For example, as shown in fig. 3, when a UE a and a UE B receive a group common PDCCH carrying indication information, after receiving the group common PDCCH, the number of repetitions of data scheduling of the group common PDCCH is determined. For example, if the information field corresponding to the number of repeated transmissions of the downlink control channel corresponding to the UE a is 01 and the information field corresponding to the number of repeated transmissions of the downlink control channel corresponding to the UE B is 00, the downlink control channel of the UE a needs to be repeatedly transmitted for 2 times, and the downlink control channel of the UE B does not need to be repeatedly transmitted.

The scheme can dynamically adjust the repeated transmission times of the downlink control channel according to different channel conditions of the terminal. For example, when the channel condition of UE a is very good and the channel condition of UE B is degraded, the downlink control channel of UE B may be instructed to perform repeated transmission and reception, so as to reduce the complexity of the terminal and reduce the delay.

On the other hand, the effective time of the indication information carried by the group common PDCCH is a time slot between two group common PDCCH transmissions, or until the next group common PDCCH carrying the indication information is successfully received.

It should be noted that, in the embodiment of the present invention, no limitation is imposed on a specific method for PDCCH repeated transmission. For example: during scheduling, H times of PDCCH may be transmitted continuously, and after PDCCH transmission is finished, a Physical Downlink Shared Channel (PDSCH) may be transmitted; or PDCCH and PDSCH bundled transmissions, i.e., each PDCCH transmission immediately followed by a corresponding scheduled PDSCH transmission.

Referring to fig. 4, which is a structural diagram of a terminal according to an embodiment of the present invention, as shown in fig. 4, a terminal 400 includes:

a first receiving module 401, configured to receive indication information sent by a network side device, where the indication information is used to indicate a number of times of retransmission of a downlink control channel and/or is used to indicate whether to start a retransmission mode of the downlink control channel;

a second receiving module 402, configured to receive the downlink control channel according to the indication information.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

Indication information carried by the RRC signaling.

the second receiving module 402 is configured to receive the downlink control channel according to the indication information of the terminal.

and the indication information of the terminal is also used for indicating:

Optionally, the frequency domain resource allocation FDRA domains of the DCI are all 1, and the specific bit is N bits that are not utilized or reserved in the DCI, where N is an integer greater than or equal to 1.

Optionally, when N is an integer greater than 1, a first part of bits of the specific bits is used to indicate that the DCI is used for scheduling of a non-contention random access CFRA or for a repeat transmission indication of the downlink control channel or for other types of uses;

Optionally, the second part bit is further configured to indicate:

It should be noted that, in this embodiment, the terminal 400 may be a terminal in any implementation manner in the method embodiment of the present invention, and any implementation manner of the terminal in the method embodiment of the present invention may be implemented by the terminal 400 in this embodiment, so as to achieve the same beneficial effects, and details are not described here.

Referring to fig. 5, a structural diagram of a network-side device according to an embodiment of the present invention is shown in fig. 5, where the network-side device 500 includes:

a first sending module 501, configured to send indication information to a terminal, where the indication information is used to indicate a number of times of retransmission of a downlink control channel and/or is used to indicate whether to start a retransmission mode of the downlink control channel;

a second sending module 502, configured to send the downlink control channel according to the indication information.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

Indication information carried by the RRC signaling.

the second sending module 502 is configured to send the downlink control channel of the terminal according to the indication information of the terminal.

Optionally, the second part bit is further configured to indicate:

It should be noted that, in this embodiment, the network-side device 500 may be a network-side device according to any implementation manner in the method embodiment of the present invention, and any implementation manner of the network-side device in the method embodiment of the present invention may be implemented by the network-side device 500 in this embodiment, so as to achieve the same beneficial effects, and details are not described here again.

Referring to fig. 6, fig. 6 is a structural diagram of another terminal according to an embodiment of the present invention, and as shown in fig. 6, the terminal includes: a transceiver 610, a memory 620, a processor 600, and a program stored on the memory 620 and executable on the processor 600, wherein:

the transceiver 610 is configured to receive indication information sent by a network side device, where the indication information is used to indicate a number of times of retransmission of a downlink control channel and/or indicate whether to start a retransmission mode of the downlink control channel;

the transceiver 610 is further configured to receive the downlink control channel according to the indication information.

The transceiver 1510, among other things, may be used to receive and transmit data under the control of the processor 1500.

In FIG. 6, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 610 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 in performing operations.

It should be noted that the memory 620 is not limited to be on the terminal, and the memory 620 and the processor 600 may be separated in different geographical locations.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

Indication information carried by the RRC signaling.

the step, executed by the transceiver, of receiving the downlink control channel according to the indication information includes:

and the indication information of the terminal is also used for indicating:

Optionally, the second part bit is further configured to indicate:

It should be noted that, in this embodiment, the terminal may be a terminal in any implementation manner in the method embodiment of the present invention, and any implementation manner of the terminal in the method embodiment of the present invention may be implemented by the terminal in this embodiment, so as to achieve the same beneficial effects, and details are not described here again.

Referring to fig. 7, fig. 7 is a structural diagram of another network-side device according to an embodiment of the present invention, and as shown in fig. 7, the network-side device includes: a transceiver 710, a memory 720, a processor 700, and a program stored on the memory 720 and executable on the processor, wherein:

the transceiver 710 is configured to send indication information to a terminal, where the indication information is used to indicate a number of times of retransmission of a downlink control channel and/or indicate whether to start a retransmission mode of the downlink control channel;

the transceiver 710 is further configured to perform the downlink control channel transmission according to the indication information.

The transceiver 710 may be used for receiving and transmitting data under the control of the processor 700.

In FIG. 7, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 700 and memory represented by memory 720. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 710 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.

It should be noted that the memory 720 is not limited to be on a network-side device, and the memory 720 and the processor 700 may be separated and located in different geographical locations.

Optionally, the indication information includes:

indication information carried by a group common downlink control channel; or

Indication information in specific bit of DCI of the first DCI format; or

Indication information carried in the MAC CE; or

Indication information carried by the RRC signaling.

the performing, by the transceiver 710, the downlink control channel transmission according to the indication information includes:

the transceiver 710 transmits the downlink control channel of the terminal according to the indication information of the terminal.

Optionally, the second part bit is further configured to indicate:

It should be noted that, in this embodiment, the network-side device may be a network-side device in any implementation manner in the method embodiment of the present invention, and any implementation manner of the network-side device in the method embodiment of the present invention may be implemented by the network-side device in this embodiment, so as to achieve the same beneficial effects, and details are not described here.

The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps in the method for transmitting a downlink control channel on a terminal side provided in the embodiment of the present invention, or the computer program is executed by the processor to implement the steps in the method for transmitting a downlink control channel on a network side device side provided in the embodiment of the present invention.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transmission method of the downlink control channel according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

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 transmitting a downlink control channel is characterized by comprising the following steps:

the terminal receives the downlink control channel according to the indication information;

wherein the indication information includes: indicating information carried by a group common downlink control channel, or indicating information in specific bit bits of DCI of a first downlink control information format DCI format;

wherein the group of common downlink control channels carries indication information of at least one terminal including the terminal; the terminal receives the downlink control channel according to the indication information, and the method comprises the following steps:

the terminal receives the downlink control channel according to the indication information of the terminal;

the indication information of the terminal is used for indicating: the number of repeated transmission times of the downlink control channel and/or whether to start the repeated transmission mode of the downlink control channel;

and the indication information of the terminal is also used for indicating: the number of times of the repeated transmission and/or whether the repeated transmission mode of the downlink control channel is started is valid in the transmission period of the group of common downlink control channels, or the number of times of the repeated transmission and/or whether the repeated transmission mode of the downlink control channel is started is valid when the terminal successfully receives the group of common downlink control channels next time and terminates;

and the frequency domain resource allocation FDRA domains of the DCI are all 1, and the specific bit is N bits which are not utilized or reserved in the DCI, wherein N is an integer greater than or equal to 1.

2. The method of claim 1, wherein in case that N is an integer greater than 1, a first part of bits of the specific bits is used to indicate that the DCI is for scheduling of a non-contention random access, CFRA, or for a repeat transmission indication of the downlink control channel, or for other types of usage;

3. The method of claim 2, wherein the first portion of bits are the first H bits of the particular bits, the second portion of bits are one or more bits of the particular bits other than the first H bits, and H is an integer less than N.

4. The method of claim 2, wherein the second portion bit is further used to indicate:

5. The method of claim 2, wherein the DCI format is a DCI format for data scheduling or a DCI format for fallback downlink scheduling.

6. The method according to any of claims 1 to 5, wherein the number of repeated transmissions of the downlink control channel is a subset of a set of repeated times, wherein the set of repeated times is protocol predefined or configured for higher layer signaling.

7. The method according to any of claims 1 to 5, wherein the number of repeated transmissions of the repeated transmission pattern is protocol predefined or higher layer signaling configured; and/or

8. A method for transmitting a downlink control channel is characterized by comprising the following steps:

the network side equipment transmits the downlink control channel according to the indication information;

wherein the indication information includes: indication information carried by a group common downlink control channel; or, indication information in specific bit of the DCI of the first DCI format;

wherein the group of common downlink control channels carries indication information of at least one terminal including the terminal; the network side device sends the downlink control channel according to the indication information, and the sending includes: the network side equipment sends the downlink control channel of the terminal according to the indication information of the terminal;

and the indication information of the terminal is used for indicating that the terminal is also used for indicating that: the number of times of the repeated transmission and/or whether the repeated transmission mode of the downlink control channel is started is valid in the transmission period of the group of common downlink control channels, or the number of times of the repeated transmission and/or whether the repeated transmission mode of the downlink control channel is started is valid when the terminal successfully receives the group of common downlink control channels next time and terminates;

the FDRA domains of the DCI are all 1, and the specific bit is N bits which are not utilized or reserved in the DCI, wherein N is an integer greater than or equal to 1.

9. The method of claim 8, wherein in case that N is an integer greater than 1, a first part of bits of the specific bit is used to indicate that the DCI is used for scheduling of a CFRA or for a repeat transmission indication of the downlink control channel or for other types of uses;

10. The method of claim 9, wherein the first portion of bits are the first H bits of the particular bits, the second portion of bits are one or more bits of the particular bits other than the first H bits, and H is an integer less than N.

11. The method of claim 9, wherein the second portion bit is further used to indicate:

12. The method of claim 9, wherein the DCI format is a DCI format for data scheduling or a DCI format for fallback downlink scheduling.

13. The method according to any of claims 8 to 12, wherein the number of repeated transmissions of the downlink control channel is a subset of a set of repeated times, wherein the set of repeated times is protocol predefined or configured for higher layer signaling.

14. The method according to any of claims 8 to 12, wherein the number of repeated transmissions of the pattern of repeated transmissions is protocol predefined or higher layer signaling configured; and/or

15. A terminal, comprising:

a second receiving module, configured to receive the downlink control channel according to the indication information;

wherein the group of common downlink control channels carries indication information of at least one terminal including the terminal; the second receiving module is used for the terminal to receive the downlink control channel according to the indication information of the terminal;

16. A network-side device, comprising:

a second sending module, configured to send the downlink control channel according to the indication information;

wherein the group of common downlink control channels carries indication information of at least one terminal including the terminal; the second sending module is configured to send the downlink control channel of the terminal according to the indication information of the terminal;

17. A terminal, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the transceiver is further configured to receive the downlink control channel according to the indication information;

wherein the group of common downlink control channels carries indication information of at least one terminal including the terminal; the receiving the downlink control channel according to the indication information includes:

receiving the downlink control channel according to the indication information of the terminal;

18. A network-side device, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the transceiver is further configured to transmit the downlink control channel according to the indication information;

wherein the group of common downlink control channels carries indication information of at least one terminal including the terminal; the sending the downlink control channel according to the indication information includes: sending the downlink control channel of the terminal according to the indication information of the terminal;

19. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps in the method for transmission of a downlink control channel according to any one of claims 1 to 7, or which, when being executed by a processor, carries out the steps in the method for transmission of a downlink control channel according to any one of claims 8 to 14.