CN108882366B

CN108882366B - Transmission method and device of Downlink Control Information (DCI)

Info

Publication number: CN108882366B
Application number: CN201710320589.7A
Authority: CN
Inventors: 孙奇; 倪吉庆; 周伟
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: 2017-05-09
Filing date: 2017-05-09
Publication date: 2022-04-08
Anticipated expiration: 2037-05-09
Also published as: CN108882366A

Abstract

The invention provides a method and a device for transmitting Downlink Control Information (DCI), wherein the method comprises the following steps: obtaining DCI to be transmitted in a downlink control channel; sending first-level DCI to user equipment, wherein the first-level DCI comprises: format information and downlink resource allocation information of the second-level DCI; and sending the second-level DCI to the user equipment. In the embodiment of the invention, the downlink control information to be transmitted in the downlink control channel is divided into two stages for transmission, and the bit number of the first-stage DCI is fixed, so that the blind detection times of the first-stage DCI are less, and the transmission reliability is improved under the same control channel resource; the first-stage DCI contains the format information of the second-stage DCI, so that the type of the second-stage DCI can be determined, and the transmission reliability is improved; and the second-level DCI is transmitted in a downlink shared data channel scheduled by a user, so that downlink transmission resources can be dynamically multiplexed, and the problem of limited capacity of a control channel is effectively solved.

Description

Transmission method and device of Downlink Control Information (DCI)

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting downlink control information DCI.

Background

The downlink control channel in LTE (long term evolution) is mainly used to transmit downlink scheduling assignment information, uplink transmission grant information, and some common control information such as paging, random access response, resource assignment information of system messages, and power control information of user groups. Based on these applications, in the LTE system, a variety of formats (dci (downlink control information) formats) of downlink control information are designed. Specifically, for the downlink scheduling assignment information, the LTE defines DCI format1, 1A, 1B, 1C, 1D, 2, 2A, and the like indicating different transmission modes of the downlink shared channel, respectively. The UE acquires the downlink control information transmitted to the UE by the base station through blind detection of various DCI formats.

However, at present, the LTE downlink control channel design mainly has the following problems:

1. higher blind detection complexity: the bits of the DCI formats in different transmission modes are different, and a user needs to perform blind detection among multiple DCI formats.

2. Control channel capacity is limited: the control channel is usually transmitted in the first several OFDM symbols of each subframe, and in order to ensure the efficiency of data transmission, the number of OFDM symbols occupied by the control channel is usually small, which results in limited capacity of the control channel.

3. The design of the control channel DCI is not easy to expand, and according to the existing LTE design, each time a new transmission mode or transmission feature is added, a new DCI format needs to be added or signaling in the DCI needs to be reconfigured and designed, so that the subsequent technology is not easy to upgrade and expand, and based on the design, it cannot be guaranteed that the UE of the previous release supports the new transmission mode and feature.

Disclosure of Invention

The invention aims to provide a method and a device for transmitting Downlink Control Information (DCI), which solve the problems of high blind detection complexity and limited control channel capacity in a DCI transmission mode in the prior art.

In order to achieve the above object, an embodiment of the present invention provides a method for transmitting downlink control information DCI, including:

obtaining DCI to be transmitted in a downlink control channel;

sending first-level DCI to user equipment, wherein the first-level DCI comprises: format information of second-level DCI and downlink resource allocation information used for indicating time-frequency resource positions of data to be transmitted in the DCI to be transmitted;

sending the second-level DCI to the user equipment, the second-level DCI including: and the DCI to be transmitted comprises other control information except the downlink resource allocation information.

Wherein the first level DCI further comprises:

the modulation coding mode is used for demodulating the configuration information of the reference signal and the data to be transmitted;

or, the first-level DCI further includes configuration information for demodulating a reference signal, and the second-level DCI further includes a modulation and coding scheme of data to be transmitted;

or, the first-level DCI further includes a modulation and coding scheme of data to be transmitted, and the second-level DCI further includes configuration information for demodulating a reference signal.

Wherein, the step of sending the first-level DCI to the user equipment comprises:

and sending first-level DCI to the user equipment on a preset number of Orthogonal Frequency Division Multiplexing (OFDM) symbols in front of each subframe.

Wherein the first level DCI further comprises: indication information for indicating the downlink shared data channel scheduled by the user equipment;

the step of sending the second-level DCI to the user equipment includes:

sending the second-level DCI to the user equipment in a downlink shared data channel scheduled by the user equipment; wherein, the starting position of the time domain resource occupied by the second-stage DCI is the same as the starting position of the downlink shared data channel.

Wherein the first level DCI further comprises: aggregation level of second level DCI.

Wherein the first level DCI further comprises: location information of transmission resources of second-level DCI;

alternatively, the method further comprises: sending a first radio resource control, RRC, signaling to the user equipment; and the first RRC signaling carries the position information of the transmission resource of the second-level DCI.

Wherein the first level DCI further comprises: the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI;

alternatively, the method further comprises: sending a second Radio Resource Control (RRC) signaling to the user equipment; and the second RRC signaling carries the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI.

Wherein the first level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation and coding mode adopted by the second-level DCI;

alternatively, the method further comprises: transmitting a third radio resource control, RRC, signaling to the user equipment; and the third RRC signaling carries the starting position of the frequency domain resource occupied by the second-level DCI and the modulation and coding mode adopted by the second-level DCI.

Wherein the first level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation coding mode of the data to be transmitted.

Wherein the step of sending the second-level DCI to the user equipment in the downlink shared data channel scheduled by the user equipment comprises:

and sending the second-level DCI to the user equipment in the downlink shared data channel by adopting a transmission mode which is the same as or different from the transmission mode of the downlink shared data channel scheduled by the user equipment.

The embodiment of the invention provides a method for transmitting Downlink Control Information (DCI), which comprises the following steps:

detecting and determining first-level DCI, the first-level DCI comprising: format information of the second-level DCI and downlink resource allocation information used for indicating the time-frequency resource position of data to be transmitted in DCI to be transmitted;

determining transmission resource positions of second-level DCI and an aggregation level of the second-level DCI;

receiving second-level DCI corresponding to format information of the second-level DCI and an aggregation level of the second-level DCI at the determined transmission resource position of the second-level DCI; wherein the second level DCI comprises: and the DCI to be transmitted comprises other control information except the downlink resource allocation information.

Wherein the first level DCI further comprises: the modulation coding mode is used for demodulating the configuration information of the reference signal and the data to be transmitted;

Wherein the step of detecting and determining the first level of DCI comprises:

and carrying out blind detection on the front preset number of orthogonal frequency division multiplexing OFDM symbols of each subframe, and determining the first-stage DCI.

the step of determining the transmission resource location of the second level DCI comprises:

and determining that the starting position of the time domain resource occupied by the second-stage DCI is the same as the starting position of the downlink shared data channel.

Wherein the first level DCI further comprises: an aggregation level of the second level DCI; the step of determining the aggregation level of the second-level DCI comprises: and determining the aggregation level of the second-level DCI according to the indication of the first-level DCI.

Wherein the first level DCI further comprises: location information of transmission resources of second-level DCI; the step of determining the transmission resource location of the second level DCI further comprises: determining the position of the transmission resource of the second-level DCI according to the position information of the transmission resource of the second-level DCI contained in the first-level DCI;

alternatively, the first-level DCI further comprises: the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI; the step of determining the transmission resource location of the second level DCI further comprises: determining the transmission resource position of the second-stage DCI according to the position of the frequency domain resource occupied by the second-stage DCI contained in the first-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI;

alternatively, the first-level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation and coding mode adopted by the second-level DCI; the step of determining the transmission resource location of the second level DCI further comprises: and determining the transmission resource position of the second-stage DCI according to the initial position of the frequency domain resource occupied by the second-stage DCI contained in the first-stage DCI and the modulation and coding mode adopted by the second-stage DCI.

Wherein the first level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation coding mode of the data to be transmitted;

the step of determining transmission resource locations of the second-level DCI and the aggregation level of the second-level DCI comprises:

determining a modulation coding mode adopted by the second-level DCI and an aggregation level of the second-level DCI according to the modulation coding mode of the data to be transmitted;

and determining the transmission resource position of the second-stage DCI according to the initial position of the frequency domain resource occupied by the second-stage DCI and the modulation and coding mode adopted by the second-stage DCI.

The step of determining the modulation and coding mode adopted by the second-level DCI and the aggregation level of the second-level DCI according to the modulation and coding mode of the data to be transmitted includes:

acquiring a target modulation grade M of a modulation coding mode of data to be transmitted;

determining a first code rate of data to be transmitted under the modulation coding mode of M-N grades; n is a predefined integer;

if the difference value between the second code rate of the second-level DCI in the M-N level modulation coding mode and the first code rate is smaller than a preset value, determining the modulation coding mode corresponding to the M-N level as the modulation coding mode adopted by the second-level DCI;

and determining the aggregation level of the second-level DCI according to the modulation coding mode adopted by the second-level DCI.

Wherein the step of determining the transmission resource location of the second level DCI comprises:

receiving a first Radio Resource Control (RRC) signaling; wherein, the first RRC signaling carries the position information of the transmission resource of the second-level DCI; determining the transmission resource position of the second-level DCI according to the first RRC signaling;

or receiving a second Radio Resource Control (RRC) signaling; the second RRC signaling carries the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI; determining the transmission resource position of the second-level DCI according to the second RRC signaling;

or, receiving a third radio resource control, RRC, signaling; wherein, a third RRC signaling carries a starting position of a frequency domain resource occupied by the second-level DCI and a modulation and coding scheme adopted by the second-level DCI; and determining the transmission resource position of the second-level DCI according to the third RRC signaling.

The embodiment of the present invention further provides a device for transmitting downlink control information DCI, including:

an obtaining module, configured to obtain DCI to be transmitted in a downlink control channel;

a first sending module, configured to send a first-level DCI to a user equipment, where the first-level DCI includes: format information of second-level DCI and downlink resource allocation information used for indicating time-frequency resource positions of data to be transmitted in the DCI to be transmitted;

a second sending module, configured to send the second-level DCI to the user equipment, where the second-level DCI includes: and the DCI to be transmitted comprises other control information except the downlink resource allocation information.

Wherein the first level DCI further comprises:

Wherein the first transmitting module comprises:

and the first sending submodule is used for sending the first-stage DCI to the user equipment on the front preset number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of each subframe.

the second sending module includes:

a second sending submodule, configured to send the second-level DCI to the user equipment in a downlink shared data channel scheduled by the user equipment; wherein, the starting position of the time domain resource occupied by the second-stage DCI is the same as the starting position of the downlink shared data channel.

alternatively, the apparatus further comprises: a first signaling sending module, configured to send a first radio resource control RRC signaling to the user equipment; and the first RRC signaling carries the position information of the transmission resource of the second-level DCI.

alternatively, the apparatus further comprises: a second signaling sending module, configured to send a second radio resource control RRC signaling to the user equipment; and the second RRC signaling carries the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI.

alternatively, the apparatus further comprises: a third signaling sending module, configured to send a third radio resource control RRC signaling to the user equipment; and the third RRC signaling carries the starting position of the frequency domain resource occupied by the second-level DCI and the modulation and coding mode adopted by the second-level DCI.

Wherein the second sending submodule includes:

a sending unit, configured to send the second-level DCI to the user equipment in the downlink shared data channel by using a transmission mode that is the same as or different from a transmission mode of the downlink shared data channel scheduled by the user equipment.

a first determination module configured to detect and determine a first level of DCI, the first level DCI comprising: format information of the second-level DCI and downlink resource allocation information used for indicating the time-frequency resource position of data to be transmitted in DCI to be transmitted;

a second determining module, configured to determine transmission resource locations of second-level DCI and an aggregation level of the second-level DCI;

a third determining module, configured to receive, at the determined transmission resource location of the second-level DCI, a second-level DCI corresponding to format information of the second-level DCI and an aggregation level of the second-level DCI; wherein the second level DCI comprises: and the DCI to be transmitted comprises other control information except the downlink resource allocation information.

Wherein the first determining module comprises:

and the first determining submodule is used for carrying out blind detection on the front preset number of orthogonal frequency division multiplexing OFDM symbols of each subframe and determining the first-stage DCI.

the second determining module includes:

and a second determining submodule, configured to determine that a starting position of the time domain resource occupied by the second-stage DCI is the same as a starting position of the downlink shared data channel.

Wherein the first level DCI further comprises: an aggregation level of the second level DCI;

the second determining module further comprises:

and the third determining submodule is used for determining the aggregation level of the second-level DCI according to the indication of the first-level DCI.

Wherein the first level DCI further comprises: location information of transmission resources of second-level DCI; the third determining module includes: a third determining submodule, configured to determine, according to the location information of the transmission resource of the second-level DCI included in the first-level DCI, a transmission resource location of the second-level DCI;

alternatively, the first-level DCI further comprises: the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI; the third determining module includes: a fourth determining submodule, configured to determine a transmission resource location of the second-level DCI according to a location of a frequency domain resource occupied by the second-level DCI included in the first-level DCI and a duration length of a time domain resource occupied by the second-level DCI;

alternatively, the first-level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation and coding mode adopted by the second-level DCI; the third determining module includes: and the fifth determining submodule is used for determining the transmission resource position of the second-level DCI according to the starting position of the frequency domain resource occupied by the second-level DCI contained in the first-level DCI and the modulation and coding mode adopted by the second-level DCI.

the second determining module includes:

a sixth determining submodule, configured to determine, according to the modulation and coding scheme of the data to be transmitted, a modulation and coding scheme used by the second-level DCI and an aggregation level of the second-level DCI;

and a seventh determining submodule, configured to determine a transmission resource position of the second-level DCI according to a starting position of the frequency domain resource occupied by the second-level DCI and a modulation and coding scheme adopted by the second-level DCI.

Wherein the sixth determination submodule includes:

the level acquisition unit is used for acquiring a target modulation level M of a modulation coding mode of data to be transmitted;

the code rate determining unit is used for determining a first code rate of data to be transmitted in the M-N level modulation coding mode; n is a predefined integer;

the coding determining unit is used for determining the modulation coding mode corresponding to the M-N grade as the modulation coding mode adopted by the second-level DCI if the difference value between the second code rate of the second-level DCI under the modulation coding mode of the M-N grade and the first code rate is smaller than a preset value;

and the grade determining unit is used for determining the aggregation grade of the second-level DCI according to the modulation coding mode adopted by the second-level DCI.

Wherein the second determining module comprises:

the first signaling submodule is used for receiving a first Radio Resource Control (RRC) signaling; wherein, the first RRC signaling carries the position information of the transmission resource of the second-level DCI; determining the transmission resource position of the second-level DCI according to the first RRC signaling;

or, the second signaling submodule is configured to receive a second radio resource control RRC signaling; the second RRC signaling carries the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI; determining the transmission resource position of the second-level DCI according to the second RRC signaling;

or, the third signaling sub-module is configured to receive a third radio resource control RRC signaling; wherein, a third RRC signaling carries a starting position of a frequency domain resource occupied by the second-level DCI and a modulation and coding scheme adopted by the second-level DCI; and determining the transmission resource position of the second-level DCI according to the third RRC signaling.

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

in the method and the device for transmitting the downlink control information DCI of the embodiment of the invention, the downlink control information to be transmitted in the downlink control channel is divided into two stages for transmission, and the number of bits of the first-stage DCI is fixed, so that the number of blind tests of the first-stage DCI is less, and the transmission reliability is improved under the same control channel resource; the first-stage DCI contains the format information of the second-stage DCI, so that the type of the second-stage DCI can be determined, and the transmission reliability is further improved; and the second-level DCI is transmitted in a downlink shared data channel scheduled by a user, so that downlink transmission resources can be dynamically multiplexed, and the problem of limited capacity of a control channel is effectively solved.

Drawings

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

fig. 2 is a flowchart illustrating a second step of a method for transmitting downlink control information DCI according to an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating secondary DCI transmission in a method for transmitting downlink control information DCI according to an embodiment of the present invention;

FIG. 4 is a diagram illustrating a second example of a secondary DCI transmission in accordance with an embodiment of the present invention;

FIG. 5 is a diagram illustrating one of two-level DCI transmission in a second example according to an embodiment of the present invention;

FIG. 6 is a second schematic diagram illustrating two-level DCI transmission in a second example according to an embodiment of the present invention;

fig. 7 is a third schematic diagram illustrating two-level DCI transmission according to a second example in an embodiment of the present invention;

fig. 8 is a schematic structural diagram illustrating an apparatus for transmitting downlink control information DCI according to an embodiment of the present invention;

fig. 9 is a second schematic structural diagram of an apparatus for transmitting downlink control information DCI 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.

As shown in fig. 1, an embodiment of the present invention provides a method for transmitting downlink control information DCI, including:

step 11, obtaining DCI to be transmitted in a downlink control channel;

step 12, sending a first-level DCI to the user equipment, where the first-level DCI includes: format information of second-level DCI and downlink resource allocation information used for indicating time-frequency resource positions of data to be transmitted in the DCI to be transmitted;

step 13, sending the second-level DCI to the user equipment, where the second-level DCI includes: and the DCI to be transmitted comprises other control information except the downlink resource allocation information.

In the above embodiment of the present invention, the downlink control information to be transmitted in the downlink control channel is divided into two stages for transmission, and as shown in fig. 3, the two stages are schematic diagrams of DCI transmitted in two stages; the first-level DCI has a relatively fixed number of information bits, and the first-level DCI at least contains the following information content: downlink resource allocation information of a user and format information of second-level DCI; the downlink resource allocation information of the user is used for indicating the time-frequency resource position of the data to be transmitted.

It should be noted that there may be many cases in the fixed number of bits of the first-level DCI, such as one number of bits X in the normal mode and another number of bits Y in the compact mode, where Y < X.

Further, in the foregoing embodiment of the present invention, step 12 includes:

and sending first-level DCI to the user equipment on a preset number of Orthogonal Frequency Division Multiplexing (OFDM) symbols in front of each subframe. For example, the first stage DCI is transmitted on the first few OFDM symbols of each subframe, such as the 1 st or 1-2 OFDM symbols. Because the first-stage DCI has a fixed information bit number, the user only needs to blindly detect the position of the first-stage DCI and the aggregation level information (the first-stage DCI transmission realizes the link self-adaption process through the aggregation level), thereby effectively reducing the blind detection times and complexity of the user and improving the transmission reliability.

Further, in the foregoing embodiment of the present invention, the first-stage DCI further includes: the modulation coding mode is used for demodulating the configuration information of the reference signal and the data to be transmitted;

In order to facilitate a user to decode and receive transmitted reference signals and data, a network side needs to send configuration information for demodulating the reference signals and a Modulation and Coding Scheme (MCS) of the data to be transmitted to a user terminal side; in the embodiment of the present invention, the configuration information of the demodulation reference signal and the modulation and coding scheme MCS of the data to be transmitted may be transmitted in the first-level DCI or the second-level DCI, which is not specifically limited herein.

Further, since there are multiple types of second-level DCI, the multiple types of DCI may have different transmission lengths and different information fields to support different transmission mode configurations; in order to avoid blind detection on the second-level DCI, the format information of the second-level DCI included in the first-level DCI is used to indicate the type of the second-level DCI, so as to determine the information included in the second-level DCI; therefore, the type of the second-level DCI can be determined, and the transmission reliability is further improved.

And the second-level DCI includes: other control information except the downlink resource allocation information in the DCI to be transmitted; for example, the new data identifier NDI, the redundancy version RV, the number of HARQ processes, MIMO related information, aperiodic CSI-RS configuration information, CQI feedback trigger for channel quality indication (CQI feedback trigger), sounding reference signal feedback (SRS trigger), power control parameter (power control), and other information; but not limited to the above information, the relevant information may be added according to the design of a specific NR (radio access network of 5G), and is not particularly limited herein.

Further, in the foregoing embodiment of the present invention, the first-stage DCI further includes: indication information for indicating the downlink shared data channel scheduled by the user equipment; step 13 then comprises:

step 131, sending the second-level DCI to the user equipment in a downlink shared data channel scheduled by the user equipment; wherein, the starting position of the time domain resource occupied by the second-stage DCI is the same as the starting position of the downlink shared data channel.

In summary, in the embodiment of the present invention, the second-level DCI is transmitted in a downlink shared data channel (PDSCH) scheduled by a user, which can dynamically multiplex downlink transmission resources, and effectively solve the problem of limited capacity of a control channel; and the second-level DCI positioned in the PDSCH channel scheduled by the user can use the same wave beam forming as the data channel to form and multiplex the pilot configuration of the PDSCH channel, so that the transmission reliability of the control channel and the transmission efficiency of data can be improved.

Further, in the above embodiments of the present invention, the second-level DCI may not be blind detected; the first level DCI also contains: aggregation level of second level DCI. And the transmission resource location of the second level DCI may be indicated by the first level DCI; indication can also be made through RRC signaling; i.e., the first level DCI further comprises: location information of transmission resources of second-level DCI; alternatively, the method further comprises: sending a first radio resource control, RRC, signaling to the user equipment; and the first RRC signaling carries the position information of the transmission resource of the second-level DCI.

Further, the transmission resource location of the second level DCI can be explicitly indicated by indicating the frequency domain location and the time domain duration length of the second level DCI; i.e., the first level DCI further comprises: the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI; alternatively, the method further comprises: sending a second Radio Resource Control (RRC) signaling to the user equipment; and the second RRC signaling carries the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI.

The frequency domain position of the second-level DCI may be preset relative to the PDSCH channel, for example, the occupied bandwidth is consistent with the PDSCH, or the initial frequency domain position is consistent with the PDSCH; the frequency domain position of the second-level DCI may also be indicated by the first-level DCI or semi-statically configured by RRC signaling.

Furthermore, the transmission resource position of the second-level DCI can be implicitly indicated by the frequency domain starting position of the second-level DCI and the MCS method adopted by the second-level DCI transmission; it should be noted that, when the first-level DCI does not include the modulation and coding scheme MCS of the data to be transmitted, the modulation and coding scheme MCS adopted by the second-level DCI may be directly indicated in the first-level DCI or the RRC signaling; i.e., the first level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation coding scheme MCS adopted by the second-level DCI; alternatively, the method further comprises: transmitting a third radio resource control, RRC, signaling to the user equipment; and the third RRC signaling carries the starting position of the frequency domain resource occupied by the second-level DCI and the modulation and coding mode adopted by the second-level DCI. For example, the second level DCI is transmitted with fixed QPSK modulation.

It should be further noted that, when the first-level DCI includes the modulation and coding scheme MCS of the data to be transmitted, the transmission resource position of the second-level DCI may implicitly indicate the starting position of the frequency domain resource occupied by the second-level DCI included in the first-level DCI and the modulation and coding scheme of the data to be transmitted.

The user implicitly determines the MCS or the aggregation level adopted by the transmission of the second-level DCI according to the MCS information in the first-level DCI; for example, the selection criteria for the second level DCI transmission using MCS or aggregation level may be: the MCS adopted by the second-level DCI transmission or the code rate under the aggregation level is made to be consistent with the MCS indicated in the first-level DCI after the data transmission MCS reverses n levels as much as possible; where n is a predefined integer.

Further, in the foregoing embodiment of the present invention, step 131 includes:

and sending the second-level DCI to the user equipment in the downlink shared data channel by adopting a transmission mode which is the same as or different from the transmission mode of the PDSCH scheduled by the user equipment. That is, the transmission mode of the second-level DCI may be the same as or different from the PDSCH, and the second-level DCI is transmitted by using beamforming or using transmission diversity, such as space-frequency block code SFBC.

In summary, in the method for transmitting downlink control information DCI provided in the above embodiment of the present invention, the downlink control information to be transmitted in the downlink control channel is divided into two stages for transmission, and the number of bits of the first stage DCI is fixed, so that the number of blind detections of the first stage DCI is small, and the reliability of transmission is improved under the same control channel resource; the first-stage DCI contains the format information of the second-stage DCI, so that the type of the second-stage DCI can be determined, and the transmission reliability is further improved; and the second-level DCI is transmitted in a downlink shared data channel scheduled by a user, so that downlink transmission resources can be dynamically multiplexed, and the problem of limited capacity of a control channel is effectively solved.

As shown in fig. 2, an embodiment of the present invention further provides a method for transmitting downlink control information DCI, where the method includes:

step 21, detecting and determining a first-stage DCI, where the first-stage DCI includes: format information of the second-level DCI and downlink resource allocation information used for indicating the time-frequency resource position of data to be transmitted in DCI to be transmitted;

step 22, determining the transmission resource position of the second-level DCI and the aggregation level of the second-level DCI;

step 23, receiving second-level DCI corresponding to the format information of the second-level DCI and the aggregation level of the second-level DCI at the determined transmission resource position of the second-level DCI; wherein the second level DCI comprises: and the DCI to be transmitted comprises other control information except the downlink resource allocation information.

In the above embodiment of the present invention, the downlink control information to be transmitted in the downlink control channel is divided into two stages for transmission; the user receives the downlink control information in two stages. The first-level DCI has a relatively fixed number of information bits, and the first-level DCI at least contains the following information content: downlink resource allocation information of a user and format information of second-level DCI; the downlink resource allocation information of the user is used for indicating the time-frequency resource position of the data to be transmitted.

Further, in the foregoing embodiment of the present invention, step 21 includes:

and carrying out blind detection on the front preset number of orthogonal frequency division multiplexing OFDM symbols of each subframe, and determining the first-stage DCI. For example, the first stage DCI is transmitted on the first few OFDM symbols of each subframe, such as the 1 st or 1-2 OFDM symbols. Because the first-stage DCI has a fixed information bit number, the user only needs to blindly detect the position of the first-stage DCI and the aggregation level information (the first-stage DCI transmission realizes the link self-adaption process through the aggregation level), thereby effectively reducing the blind detection times and complexity of the user and improving the transmission reliability. After the user detects and obtains the first-level DCI, the user may immediately start processing the bit field of the received data, such as operations of deframing, OFDM decoding, channel estimation, and the like, which is not limited herein.

Further, in the foregoing embodiment of the present invention, the first-stage DCI further includes: the modulation coding mode is used for demodulating the configuration information of the reference signal and the data to be transmitted; or, the first-level DCI further includes configuration information for demodulating a reference signal, and the second-level DCI further includes a modulation and coding scheme of data to be transmitted; or, the first-level DCI further includes a modulation and coding scheme of data to be transmitted, and the second-level DCI further includes configuration information for demodulating a reference signal.

Further, in the foregoing embodiment of the present invention, the first-stage DCI further includes: indication information for indicating the downlink shared data channel scheduled by the user equipment; step 22 then comprises:

Further, in the above embodiments of the present invention, the second-level DCI may not perform blind detection, and the transmission resource location of the second-level DCI may be indicated by the first-level DCI; it may also be indicated through RRC signaling, that is, the first-level DCI further includes: an aggregation level of the second level DCI; step 22 further comprises: and determining the aggregation level of the second-level DCI according to the indication of the first-level DCI.

Further, in the foregoing embodiment of the present invention, the first-stage DCI further includes: location information of transmission resources of second-level DCI; step 22 further comprises: determining the position of the transmission resource of the second-level DCI according to the position information of the transmission resource of the second-level DCI contained in the first-level DCI; or, the embodiment of the invention further comprises: receiving a first Radio Resource Control (RRC) signaling; wherein, the first RRC signaling carries the position information of the transmission resource of the second-level DCI; and determining the transmission resource position of the second-level DCI according to the first RRC signaling.

Further, the first stage DCI further comprises: the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI; step 22 further comprises: determining the transmission resource position of the second-stage DCI according to the position of the frequency domain resource occupied by the second-stage DCI contained in the first-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI; or, the embodiment of the invention further comprises: receiving a second Radio Resource Control (RRC) signaling; the second RRC signaling carries the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI; and determining the transmission resource position of the second-level DCI according to the second RRC signaling.

Further, the first stage DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation and coding mode adopted by the second-level DCI; step 22 further comprises: and determining the transmission resource position of the second-stage DCI according to the initial position of the frequency domain resource occupied by the second-stage DCI contained in the first-stage DCI and the modulation and coding mode adopted by the second-stage DCI. Or, the embodiment of the invention further comprises: receiving a third radio resource control, RRC, signaling; wherein, a third RRC signaling carries a starting position of a frequency domain resource occupied by the second-level DCI and a modulation and coding scheme adopted by the second-level DCI; and determining the transmission resource position of the second-level DCI according to the third RRC signaling.

Further, in the foregoing embodiment of the present invention, the first-stage DCI further includes: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation coding mode of the data to be transmitted; step 22 then comprises:

determining a modulation coding mode adopted by the second-level DCI and an aggregation level of the second-level DCI according to the modulation coding mode of the data to be transmitted; and determining the transmission resource position of the second-stage DCI according to the initial position of the frequency domain resource occupied by the second-stage DCI and the modulation and coding mode adopted by the second-stage DCI.

Further, the step of determining the modulation and coding scheme adopted by the second-level DCI and the aggregation level of the second-level DCI according to the modulation and coding scheme of the data to be transmitted includes:

acquiring a target modulation grade M of a modulation coding mode of data to be transmitted; determining a first code rate of data to be transmitted under the modulation coding mode of M-N grades; n is a predefined integer; if the difference value between the second code rate of the second-level DCI in the M-N level modulation coding mode and the first code rate is smaller than a preset value, determining the modulation coding mode corresponding to the M-N level as the modulation coding mode adopted by the second-level DCI; and determining the aggregation level of the second-level DCI according to the modulation coding mode adopted by the second-level DCI.

When the first-level DCI includes the modulation and coding scheme MCS of the data to be transmitted, the transmission resource position of the second-level DCI may implicitly indicate the starting position of the frequency domain resource occupied by the second-level DCI included in the first-level DCI and the modulation and coding scheme of the data to be transmitted. The user implicitly determines the MCS or the aggregation level adopted by the transmission of the second-level DCI according to the MCS information in the first-level DCI; for example, the selection criteria for the second level DCI transmission using MCS or aggregation level may be: the MCS adopted by the second-level DCI transmission or the code rate under the aggregation level is made to be consistent with the MCS indicated in the first-level DCI after the data transmission MCS reverses n levels as much as possible; where n is a predefined integer.

In summary, in the transmission method of the downlink control information DCI provided in the above embodiment of the present invention, the downlink control information to be transmitted in the downlink control channel is divided into two stages for transmission, and the number of bits of the first stage DCI is fixed, so that the number of blind detections of the first stage DCI is small, and the transmission reliability is improved under the same control channel resource; and the first-stage DCI contains the format information of the second-stage DCI, so that the type of the second-stage DCI can be determined, and the transmission reliability is further improved. Examples are as follows:

first example

As shown in table 1, an embodiment of 2-level DCI content partitioning is presented.

TABLE 1

Specifically, fig. 4 is a schematic diagram of secondary DCI; the resource allocation information in the first-stage DCI comprises resource allocation information of a time domain and a frequency domain; and the format information in the first-level DCI for indicating the second level may use N bits to indicate 2N different second-level DCI formats; as in the example above, 00 indicates format1 in the second level DCI, 01 indicates format 2 in the second level DCI, and 10 indicates format 3 in the second level DCI. The time frequency resource initial position of the second-level DCI is defaulted to be the PDSCH initial position, and the occupied specific time frequency resource is indicated through the time domain symbol number.

Second example

As shown in table 2, an embodiment of 2-level DCI content partitioning is presented.

TABLE 2

Specifically, fig. 5, fig. 6 and fig. 7 are schematic diagrams of secondary DCI; wherein, the time-frequency resource starting position of the second-level DCI in fig. 5 and fig. 6 defaults to the PDSCH starting position; while the time-frequency resource starting position of the second-level DCI in fig. 7 is configured semi-statically by RRC signaling, and the configuration criterion is that the base station selects a sub-band with better channel quality in the PDSCH resource as the frequency domain transmission unit of the second-level DCI.

The resource allocation information in the first-stage DCI comprises resource allocation information of a time domain and a frequency domain; the format information in the first-level DCI for indicating the second level may use N bits to indicate 2N different second-level DCI formats; as in the example above, 00 indicates format1 in the second level DCI, 01 indicates format 2 in the second level DCI, and 10 indicates format 3 in the second level DCI. And the specific time frequency resource occupied by the second-stage DCI is determined according to the aggregation level of the second-stage DCI indicated by the first stage.

The symbol mapping of the second-level DCI may be performed in a frequency domain first and then a time domain second manner, or may be performed in a time domain first and then a frequency domain second manner. The time frequency resource start position of the second-level DCI may be the PDSCH start position by default or may be semi-statically configured by RRC signaling.

Third example

As shown in table 3, an embodiment of 2-level DCI content partitioning is presented.

TABLE 3

Specifically, the resource allocation information in the first-stage DCI includes resource allocation information of a time domain and a frequency domain; the format information in the first-level DCI for indicating the second level may use N bits to indicate 2N different second-level DCI formats; as in the example above, 00 indicates format1 in the second level DCI, 01 indicates format 2 in the second level DCI, and 10 indicates format 3 in the second level DCI. And the specific time frequency resource occupied by the second-stage DCI is implicitly determined according to the MCS information in the first-stage DCI.

The selection criteria for determining the aggregation level of the second-level DCI are as follows: the MCS adopted by the second-level DCI transmission or the code rate under the aggregation level is made to be consistent with the MCS indicated in the first-level DCI after the data transmission MCS reverses n levels as much as possible; where n is a predefined integer. And the symbol mapping of the second-level DCI is mapped according to a mode of firstly mapping a frequency domain and then mapping a time domain. The time frequency resource start position of the second-level DCI may be the PDSCH start position by default or may be semi-statically configured by RRC signaling.

Fourth example

As shown in table 4, an embodiment of 2-level DCI content partitioning is presented. (first-level DCI does not contain MCS of data to be transmitted)

TABLE 4

Specifically, the resource allocation information in the first-stage DCI includes resource allocation information of a time domain and a frequency domain; the format information in the first-level DCI for indicating the second-level DCI may use N bits to indicate 2N different second-level DCI formats; as in the example above, 00 indicates format1 in the second level DCI, 01 indicates format 2 in the second level DCI, and 10 indicates format 3 in the second level DCI. The time frequency resource initial position of the second-level DCI is defaulted to be the PDSCH initial position, and the occupied specific time frequency resource is indicated through the time domain symbol number.

Fifth example

As shown in table 5, an embodiment of 2-level DCI content partitioning is presented. (the first DCI does not contain the MCS of the data to be transmitted and the configuration information of the user demodulation reference signal)

TABLE 5

Specifically, the resource allocation information in the first-stage DCI includes resource allocation information of a time domain and a frequency domain; the format information in the first-level DCI for indicating the second level may use N bits to indicate 2N different second-level DCI formats; as in the example above, 00 indicates format1 in the second level DCI, 01 indicates format 2 in the second level DCI, and 10 indicates format 3 in the second level DCI.

The time frequency resource initial position of the second-level DCI is defaulted to be the PDSCH initial position, and the occupied specific time frequency resource is indicated through the time domain symbol number.

Sixth example

As shown in table 6, an embodiment of 2-level DCI content partitioning is presented.

TABLE 6

Specifically, the resource allocation information in the first-stage DCI includes resource allocation information of a time domain and a frequency domain; the format information in the first-level DCI for indicating the second level may use N bits to indicate 2N different second-level DCI formats; as in the example above, 00 indicates format1 in the second level DCI, 01 indicates format 2 in the second level DCI, and 10 indicates format 3 in the second level DCI. And the specific time frequency resource occupied by the second-stage DCI is determined according to the aggregation level of the second-stage DCI indicated by the first stage. The symbol mapping of the second-level DCI may be performed in a frequency domain first and then a time domain second manner, or may be performed in a time domain first and then a frequency domain second manner. The time frequency resource start position of the second-level DCI may be the PDSCH start position by default or may be semi-statically configured by RRC signaling.

As shown in fig. 8, an embodiment of the present invention further provides a device for transmitting downlink control information DCI, including:

an obtaining module 31, configured to obtain DCI to be transmitted in a downlink control channel;

a first sending module 32, configured to send first-level DCI to a user equipment, where the first-level DCI includes: format information of second-level DCI and downlink resource allocation information used for indicating time-frequency resource positions of data to be transmitted in the DCI to be transmitted;

a second sending module 33, configured to send the second-level DCI to the user equipment, where the second-level DCI includes: and the DCI to be transmitted comprises other control information except the downlink resource allocation information.

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes:

Specifically, in the foregoing embodiment of the present invention, the first sending module includes:

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes: indication information for indicating the downlink shared data channel scheduled by the user equipment;

the second sending module includes:

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes: aggregation level of second level DCI.

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes: location information of transmission resources of second-level DCI;

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes: the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI;

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation and coding mode adopted by the second-level DCI;

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation coding mode of the data to be transmitted.

Specifically, in the foregoing embodiment of the present invention, the second sending sub-module includes:

In summary, in the transmission apparatus for the DCI according to the above embodiments of the present invention, the downlink control information to be transmitted in the downlink control channel is divided into two stages for transmission, and the number of bits of the first stage DCI is fixed, so that the number of blind detections of the first stage DCI is less, and the transmission reliability is improved under the same control channel resource; the first-stage DCI contains the format information of the second-stage DCI, so that the type of the second-stage DCI can be determined, and the transmission reliability is further improved; and the second-level DCI is transmitted in a downlink shared data channel scheduled by a user, so that downlink transmission resources can be dynamically multiplexed, and the problem of limited capacity of a control channel is effectively solved.

It should be noted that, the transmission apparatus for the downlink control information DCI provided in the embodiments of the present invention is a transmission apparatus capable of executing the transmission method for the downlink control information DCI, and all embodiments of the transmission method for the downlink control information DCI are applicable to the transmission apparatus for the downlink control information DCI, and can achieve the same or similar beneficial effects.

As shown in fig. 9, an embodiment of the present invention further provides a device for transmitting downlink control information DCI, including:

a first determining module 41, configured to detect and determine a first-level DCI, where the first-level DCI includes: format information of the second-level DCI and downlink resource allocation information used for indicating the time-frequency resource position of data to be transmitted in DCI to be transmitted;

a second determining module 42, configured to determine transmission resource locations of the second level DCI and an aggregation level of the second level DCI;

a third determining module 43, configured to receive second-level DCI corresponding to format information of the second-level DCI and an aggregation level of the second-level DCI at the determined transmission resource location of the second-level DCI; wherein the second level DCI comprises: and the DCI to be transmitted comprises other control information except the downlink resource allocation information.

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes: the modulation coding mode is used for demodulating the configuration information of the reference signal and the data to be transmitted;

Specifically, in the foregoing embodiment of the present invention, the first determining module includes:

the second determining module includes:

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes: an aggregation level of the second level DCI;

the second determining module further comprises:

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes: location information of transmission resources of second-level DCI; the third determining module includes: a third determining submodule, configured to determine, according to the location information of the transmission resource of the second-level DCI included in the first-level DCI, a transmission resource location of the second-level DCI;

Specifically, in the foregoing embodiment of the present invention, the first-stage DCI further includes: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation coding mode of the data to be transmitted;

the second determining module includes:

Specifically, in the foregoing embodiment of the present invention, the sixth determining sub-module includes:

Specifically, in the foregoing embodiment of the present invention, the second determining module includes:

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 Downlink Control Information (DCI) is characterized by comprising the following steps:

obtaining DCI to be transmitted in a downlink control channel;

sending first-level DCI to user equipment, wherein the first-level DCI comprises: format information of second-level DCI and downlink resource allocation information used for indicating time-frequency resource positions of data to be transmitted in the DCI to be transmitted; the first level DCI has a fixed number of information bits;

2. The method of claim 1, wherein the first level DCI further comprises:

3. The method of claim 1, wherein the step of sending first level DCI to a user device comprises:

4. The method of claim 1, wherein the first level DCI further comprises: indication information for indicating the downlink shared data channel scheduled by the user equipment;

the step of sending the second-level DCI to the user equipment includes:

5. The method of claim 1, wherein the first level DCI further comprises: aggregation level of second level DCI.

6. The method of claim 4 or 5, wherein the first level DCI further comprises: location information of transmission resources of second-level DCI;

7. The method of claim 4 or 5, wherein the first level DCI further comprises: the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI;

8. The method of claim 4 or 5, wherein the first level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation and coding mode adopted by the second-level DCI;

9. The method of claim 1 or 5, wherein the first level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation coding mode of the data to be transmitted.

10. The method of claim 4, wherein the step of sending the second-level DCI to the user equipment in a downlink shared data channel scheduled by the user equipment comprises:

11. A method for transmitting Downlink Control Information (DCI) is characterized by comprising the following steps:

detecting and determining first-level DCI, the first-level DCI comprising: format information of the second-level DCI and downlink resource allocation information used for indicating the time-frequency resource position of data to be transmitted in DCI to be transmitted; the first level DCI has a fixed number of information bits;

12. The method of claim 11, wherein the first level DCI further comprises: the modulation coding mode is used for demodulating the configuration information of the reference signal and the data to be transmitted;

13. The method of claim 11, wherein the step of detecting and determining first level DCI comprises:

14. The method of claim 11, wherein the first level DCI further comprises: indication information for indicating a downlink shared data channel scheduled by user equipment;

15. The method of claim 11, wherein the first level DCI further comprises: an aggregation level of the second level DCI; the step of determining the aggregation level of the second-level DCI comprises: and determining the aggregation level of the second-level DCI according to the indication of the first-level DCI.

16. The method according to claim 14 or 15,

the first level DCI further comprises: location information of transmission resources of second-level DCI; the step of determining the transmission resource location of the second level DCI further comprises: determining the position of the transmission resource of the second-level DCI according to the position information of the transmission resource of the second-level DCI contained in the first-level DCI;

17. The method of claim 11 or 14, wherein the first level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation coding mode of the data to be transmitted;

18. The method of claim 17, wherein the step of determining the modulation and coding scheme used by the second-level DCI and the aggregation level of the second-level DCI according to the modulation and coding scheme of the data to be transmitted comprises:

19. The method of claim 14 or 15, wherein the step of determining the transmission resource location of the second level DCI comprises:

20. A device for transmitting downlink control information DCI, comprising:

a first sending module, configured to send a first-level DCI to a user equipment, where the first-level DCI includes: format information of second-level DCI and downlink resource allocation information used for indicating time-frequency resource positions of data to be transmitted in the DCI to be transmitted; the first level DCI has a fixed number of information bits;

21. The apparatus of claim 20, wherein the first level DCI further comprises:

22. The apparatus of claim 20, wherein the first sending module comprises:

23. The apparatus of claim 20, wherein the first level DCI further comprises: indication information for indicating the downlink shared data channel scheduled by the user equipment;

the second sending module includes:

24. The apparatus of claim 20, wherein the first level DCI further comprises: aggregation level of second level DCI.

25. The apparatus of claim 23 or 24, wherein the first-level DCI further comprises: location information of transmission resources of second-level DCI;

26. The apparatus of claim 23 or 24, wherein the first-level DCI further comprises: the position of the frequency domain resource occupied by the second-stage DCI and the duration length of the time domain resource occupied by the second-stage DCI;

27. The apparatus of claim 23 or 24, wherein the first-level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation and coding mode adopted by the second-level DCI;

28. The apparatus of claim 20 or 24, wherein the first level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation coding mode of the data to be transmitted.

29. The apparatus of claim 23, wherein the second transmit submodule comprises:

30. A device for transmitting downlink control information DCI, comprising:

a first determination module configured to detect and determine a first level of DCI, the first level DCI comprising: format information of the second-level DCI and downlink resource allocation information used for indicating the time-frequency resource position of data to be transmitted in DCI to be transmitted; the first level DCI has a fixed number of information bits;

31. The apparatus of claim 30, wherein the first level DCI further comprises: the modulation coding mode is used for demodulating the configuration information of the reference signal and the data to be transmitted;

32. The apparatus of claim 30, wherein the first determining module comprises:

33. The apparatus of claim 30, wherein the first level DCI further comprises: indication information for indicating a downlink shared data channel scheduled by user equipment;

the second determining module includes:

34. The apparatus of claim 30, wherein the first level DCI further comprises: an aggregation level of the second level DCI;

the second determining module further comprises:

35. The apparatus of claim 33 or 34,

the first level DCI further comprises: location information of transmission resources of second-level DCI; the third determining module includes: a third determining submodule, configured to determine, according to the location information of the transmission resource of the second-level DCI included in the first-level DCI, a transmission resource location of the second-level DCI;

36. The apparatus of claim 30 or 33, wherein the first level DCI further comprises: the initial position of the frequency domain resource occupied by the second-level DCI and the modulation coding mode of the data to be transmitted;

the second determining module includes:

37. The apparatus of claim 36, wherein the sixth determination submodule comprises:

38. The apparatus of claim 33 or 34, wherein the second determining module comprises: