WO2017166232A1

WO2017166232A1 - Method, device, and system for transmitting downlink control information

Info

Publication number: WO2017166232A1
Application number: PCT/CN2016/078192
Authority: WO
Inventors: 周涵; 花梦; 焦淑蓉; 张兴炜
Original assignee: 华为技术有限公司
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2017-10-05

Abstract

Disclosed in the embodiments of the present invention are a method, a device, and a system for transmitting downlink control information, which belong to the technical field of wireless communications. The method comprises: a base station determining uplink scheduling downlink control information (DCI), to which a terminal corresponds, and determining a transmission time interval (TTI) to transmit the uplink scheduling DCI; the base station sending, within the TTI, the uplink scheduling DCI to the terminal, if a time frequency region, which is indicated by downlink scheduling DCI that is allocated by the base station to the terminal, is included within the TTI, a time frequency resource of the uplink scheduling DCI being situated in the time frequency region indicated by the downlink scheduling DCI. The present invention can reduce the waste of time frequency resources.

Description

Method, device and system for transmitting downlink control information

Technical field

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

Background technique

In the LTE (Long Term Evolution) system, the terminal needs to perform scheduling by the base station to transmit uplink data or receive downlink data. That is, the base station can send Downlink Control Information (Downlink Control Information) to the terminal. The scheduling DCI is used to indicate the time-frequency resource used by the downlink data sent by the base station to the terminal, and the base station may further send an uplink scheduling DCI to the terminal, where the uplink scheduling DCI is used to indicate the time-frequency resource used by the uplink data to be sent by the terminal. .

The method for the base station to send the uplink scheduling DCI to the terminal is: when the terminal needs to send the uplink data to the base station, the terminal may send an uplink scheduling request to the base station, and after receiving the uplink scheduling request, the base station may allocate the time-frequency resource to the terminal, and determine the uplink scheduling. The DCI, in turn, the terminal may send uplink data on the time-frequency resource indicated by the uplink scheduling DCI. Currently, the communication system sets a certain time-frequency resource for each TTI (Transmission Time Interval) as a common control area, where the common control area can be used to send an uplink scheduling DCI, and the public in each TTI The size of the control area is fixed for a period of time.

Due to the randomness of the transmitted data, the actual amount of data transmitted by the base station in the common control region within each TTI has fluctuations, but the size of the common control region in each TTI is fixed for a period of time, when in a certain TTI The actual amount of data transmitted in the public control area is relatively small, which will result in waste of time-frequency resources.

Summary of the invention

The present invention provides a method, an apparatus, and a system for transmitting downlink control information, in order to reduce the waste of time-frequency resources.

The technical solution is as follows:

The first aspect provides a method for transmitting downlink control information, where the method includes:

Determining, by the base station, the uplink scheduling downlink control information DCI corresponding to the terminal, and determining a transmission time interval TTI for transmitting the uplink scheduling DCI;

The base station sends the uplink scheduling DCI to the terminal in the TTI, where the uplink includes the time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal, The time-frequency resource for scheduling the DCI is located in the time-frequency region indicated by the downlink scheduling DCI.

The uplink scheduling DCI can be used to indicate the time-frequency resource used by the uplink data to be sent by the terminal.

When the terminal needs to send the uplink data to the base station, the terminal may send an uplink scheduling request to the base station. After receiving the uplink scheduling request sent by the terminal, the base station may determine the uplink scheduling DCI corresponding to the terminal, where the uplink scheduling DCI may include the terminal sending the uplink data. Control information such as time, frequency resource, and modulation and coding mode are used, and the TTI for transmitting the uplink scheduling DCI may be determined, where the duration of the TTI may be less than 1 millisecond. After determining the uplink scheduling DCI, the base station may send the uplink scheduling DCI to the terminal in the determined TTI. Specifically, the base station may determine, according to whether the time-frequency region indicated by the downlink scheduling DCI of the terminal is in the TTI, determine the time-frequency resource of the uplink scheduling DCI, and if the TTI that sends the uplink scheduling DCI includes the time-frequency region corresponding to the terminal ( If the time-frequency region is indicated by the downlink scheduling DCI of the corresponding terminal, the time-frequency resource of the uplink scheduling DCI may be configured in a time-frequency region corresponding to the terminal, that is, if the base station is in the TTI The terminal sends the uplink scheduling DCI, and also sends the downlink service data to the terminal in the TTI (where the base station sends the downlink service data to the terminal in the time-frequency region corresponding to the downlink scheduling DCI indication of the terminal), and the time-frequency corresponding to the terminal can be The area performs a puncture or rate matching process, that is, an uplink scheduling DCI can be sent in a certain time-frequency resource block in the time-frequency region.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the TTI includes a common control area;

If the time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal is not included in the TTI, the time-frequency resource of the uplink scheduling DCI is located in a common control region included in the TTI.

The base station may also preset a possible specific location of the uplink scheduling DCI in the time-frequency region (or the PDSCH time-frequency region), and may refer to multiple possible location combinations as the search space of the uplink scheduling DCI. Each possible position in the search space may be represented by an aggregation level and a relative position, wherein the relative position may be a relative position (relative time and relative frequency) of the start position of the uplink scheduling DCI and the time-frequency region (or the PDSCH time-frequency region) Position), for example, can be uplink scheduling DCI relative to time The symbol offset and frequency offset of the start position of the frequency region (or PDSCH time-frequency region), for example, the search space may include the following possible locations: (AL1, symbol 0, carrier 4), (AL1, symbol) 2. Carrier 16), (AL2, symbol 2, carrier 8), wherein the parameters in parentheses indicate the aggregation level, the offset of the uplink scheduling DCI relative to the start symbol of the time-frequency region (or PDSCH time-frequency region), and The index offset of the starting carrier. In addition, the uplink scheduling DCI may also adopt a distributed transmission mode, that is, the time-frequency resources of the uplink scheduling DCI may be dispersedly arranged in the time-frequency region (or the PDSCH time-frequency region). Regardless of the manner in which the uplink scheduling DCI is transmitted, the base station needs to predefine a search space that can determine the time-frequency resources occupied by the uplink scheduling DCI. In addition, in order to simplify the communication system and implement it easily, the base station may also define a specific location of the uplink scheduling DCI in advance. The pre-defined search space, the base station can notify the terminal in the following manners: the search space can be defined in the system message, and the RRC (Radio Resource Control) message can be sent to the terminal corresponding to the DCI in advance to define the search. space.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the time-frequency region indicated by the downlink scheduling DCI is a data channel time-frequency region indicated by the downlink scheduling DCI.

With reference to the first aspect, in a third possible implementation manner of the first aspect, the time-frequency resource of the downlink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.

The time-frequency resource of the downlink scheduling DCI may be located in a time-frequency region indicated by the downlink scheduling DCI. The time-frequency region including the downlink scheduling DCI may be referred to as a self-inclusive time-frequency region. If the time-frequency region of the corresponding terminal is included in the TTI of the uplink scheduling DCI, the time-frequency resources of the uplink scheduling DCI and the downlink scheduling DCI may be located in the time-frequency region, in other words, if included in the TTI for transmitting the uplink scheduling DCI. The time-frequency resource of the uplink scheduling DCI may be located in the self-included time-frequency region.

With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the downlink scheduling DCI further carries indication information, where the indication information is used to indicate that the uplink scheduling DCI is included in the time-frequency region.

To improve the correct rate of receiving the uplink scheduling DCI, the downlink scheduling DCI may include indication information, where the indication information may be used to indicate that the time-frequency region corresponding to the terminal includes the uplink scheduling DCI. Specifically, the base station may add a bit indication to the downlink scheduling DCI to indicate whether the uplink scheduling DCI is included in the time-frequency region of the corresponding terminal. Specifically, the bit may be added in the downlink scheduling DCI, and the value is represented by the value of the bit. Whether the uplink scheduling DCI is included in the time-frequency region, for example, when the value of the bit is "0", indicating that the uplink scheduling DCI is not included in the time-frequency region, when the value of the bit is When it is "1", it indicates that the time-frequency region includes the uplink scheduling DCI. In addition, the base station may further set a power offset for the uplink scheduling DCI, so that the uplink scheduling DCI transmission power is greater than the transmission power of the downlink service data carried in the time-frequency region. The time-frequency resource of the uplink scheduling DCI can also be configured in the vicinity of the time-frequency resource of the downlink reference signal.

A second aspect provides a method for transmitting downlink control information, where the method includes:

The terminal receives the uplink scheduling downlink control information DCI sent by the base station in the transmission time interval TTI, where the uplink scheduling DCI is included if the TTI includes the time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal. The time-frequency resource is located in a time-frequency region indicated by the downlink scheduling DCI;

The terminal sends uplink data to the base station based on the time-frequency resource indicated by the uplink scheduling DCI.

After the base station sends the uplink scheduling DCI to the terminal, the terminal may receive the uplink scheduling DCI sent by the base station, where the time-frequency resource of the uplink scheduling DCI is located in the time-frequency region included in the TTI indicated by the downlink scheduling DCI of the corresponding terminal. After receiving the uplink scheduling DCI sent by the base station, the terminal may send uplink data to the base station according to the uplink scheduling DCI.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the receiving, by the terminal, the uplink scheduling DCI sent by the base station in the TTI includes:

Receiving, by the terminal, a signal in a TTI sent by the base station;

The terminal acquires an uplink scheduling DCI corresponding to the terminal, based on the at least one preset location, in the signal in the time-frequency region indicated by the downlink scheduling DCI.

The base station may send the uplink scheduling DCI in the time-frequency region indicated by the downlink scheduling DCI, or may send the uplink scheduling DCI in the common control region, or may not send the uplink scheduling DCI to the terminal in the TTI. The terminal can receive the signal in the TTI sent by the base station, and then perform a blind check on the signal in the TTI to determine whether the uplink scheduling DCI corresponding to the terminal is included in the TTI, where the terminal can schedule the DCI according to the foregoing predefined uplink scheduling. The corresponding search space detects signals in the time-frequency region (or PDSCH time-frequency region) indicated by the downlink scheduling DCI.

Specifically, the terminal may determine, according to the downlink scheduling DCI of the corresponding terminal, the time-frequency region (or the PDSCH time-frequency region) indicated by the downlink scheduling DCI, and then, according to the starting position of the time-frequency region, and the pre-stored uplink scheduling DCI. The number of possible locations (including the aggregation level and the relative location) included in the search space, and the time-frequency resources corresponding to each possible location of the uplink scheduling DCI (ie, the time-frequency resources occupied by the uplink scheduling DCI) are calculated, and then, respectively, Time-frequency resources for each possible location The inner signal is DCI decoded. If the decoding is correct, the terminal can correctly obtain the uplink scheduling DCI sent by the base station. Further, after the terminal correctly acquires the uplink scheduling DCI at a certain position, the terminal can schedule the time-frequency region indicated by the DCI from the downlink. The signal in the time-frequency resource occupied by the uplink scheduling DCI is removed from the signal in the (or PDSCH time-frequency region), and further, the downlink service data decoding can be performed in the remaining signal, and if the decoding passes the verification, the terminal is indicated. The downlink service data sent by the base station can be correctly received. If the check fails, the terminal does not correctly receive the downlink service data sent by the base station. At this time, the terminal may send a NACK (reception error) feedback message to the base station, requesting the base station to resend the downlink. Business data. In addition, after determining the corresponding time-frequency region, the terminal may first perform downlink service data decoding on the signal in the time-frequency region. If the decoding is correct, it indicates that the time-frequency region does not include the uplink scheduling DCI, and the terminal may no longer be in the terminal. The uplink scheduling DCI is detected in the signal in the time-frequency region (or the PDSCH time-frequency region). If the decoding is incorrect, the terminal may perform the signal in the time-frequency region (or the PDSCH time-frequency region) according to the method for detecting the uplink scheduling DCI. The uplink scheduling DCI is detected.

In addition, if the terminal performs DCI decoding on the signals in the time-frequency resources corresponding to all possible locations in the search space, and the decoding is not correct, the terminal may schedule the time-frequency region indicated by the DCI from the downlink for each possible location ( Or the signal in the time-frequency region of the PDSCH culls the signal on the time-frequency resource corresponding to the location, and further, the downlink service data can be decoded in the remaining signal. If the decoding passes the verification, the terminal can be correct. Receiving the downlink service data sent by the base station, if all the packets are not verified, the terminal does not correctly receive the downlink service data sent by the base station. At this time, the terminal may send a NACK (reception error) feedback message to the base station, requesting the base station to resend the downlink service. data.

It should be noted that, in the foregoing method for detecting the uplink scheduling DCI, after the terminal determines the time-frequency region (or the PDSCH time-frequency region) indicated by the downlink scheduling DCI, the terminal first detects the uplink scheduling DCI at each possible location, and then detects the downlink service data. . After determining the time-frequency region (or the PDSCH time-frequency region) of the downlink scheduling DCI indication, the terminal may first detect the downlink service data, and then detect the uplink scheduling DCI. The specific method may be as follows: after the terminal determines the time-frequency region (or the PDSCH time-frequency region) indicated by the downlink scheduling DCI, the terminal may be included according to the starting location of the time-frequency region and the pre-stored uplink scheduling DCI search space. a possible location (including an aggregation level and a relative location), and calculating a time-frequency resource corresponding to each possible location of the uplink scheduling DCI (ie, a time-frequency resource occupied by the uplink scheduling DCI), and further, for each possible location, the terminal may The signal in the time-frequency region (or the PDSCH time-frequency region) indicated by the downlink scheduling DCI is used to remove the signal on the time-frequency resource corresponding to the possible location, and further, the downlink service data decoding may be performed in the remaining signal, if decoding By verification, it means The terminal can correctly receive the downlink service data sent by the base station. Further, after the terminal correctly obtains the downlink service data, the terminal can perform DCI decoding on the signal on the time-frequency resource corresponding to the possible location. If the decoding is correct, the terminal can acquire the base station. The uplink scheduling DCI of the transmission, if the decoding is incorrect, indicates that the terminal does not correctly receive the uplink scheduling DCI sent by the base station. If the terminal does not decode correctly when performing downlink service data decoding for each possible location, it indicates that the terminal does not correctly receive the downlink service data sent by the base station. For this method, if the terminal does not decode the downlink service data for each possible location, the terminal may perform DCI decoding on the signal on the time-frequency resource corresponding to each possible location included in the search space. If the decoding is correct at a certain location, the terminal can acquire the uplink scheduling DCI sent by the base station.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the TTI includes a common control region; if the TTI does not include a downlink scheduling DCI indication that is allocated by the base station to the terminal In the time-frequency region, the time-frequency resources of the uplink scheduling DCI are located in a common control region included in the TTI.

With reference to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the receiving, by the terminal, the uplink scheduling DCI sent by the base station in the TTI includes:

Receiving, by the terminal, a signal in a TTI sent by the base station;

The terminal acquires an uplink scheduling DCI corresponding to the terminal, based on the at least one preset location stored in advance in the signal in the common control area.

With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the time-frequency region indicated by the downlink scheduling DCI is a data channel time-frequency region indicated by the downlink scheduling DCI.

With reference to the second aspect, in a fifth possible implementation manner of the second aspect, the time-frequency resource of the downlink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.

With reference to the second aspect, in a sixth possible implementation manner of the second aspect, the downlink scheduling DCI further carries indication information, where the indication information is used to indicate that the uplink scheduling DCI is included in the time-frequency region.

In a third aspect, a base station is provided, characterized in that the base station comprises a processor and a transmitter, wherein:

The processor is configured to determine an uplink scheduling downlink control information DCI corresponding to the terminal, and determine a transmission time interval TTI for transmitting the uplink scheduling DCI;

The transmitter is configured to send, to the terminal, an uplink scheduling DCI, where the TTI includes a time-frequency region indicated by a downlink scheduling DCI allocated by the base station to the terminal The time-frequency resource of the uplink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the TTI includes a common control area;

With reference to the third aspect, in a second possible implementation manner of the third aspect, the time-frequency region indicated by the downlink scheduling DCI is a data channel time-frequency region indicated by the downlink scheduling DCI.

With reference to the third aspect, in a third possible implementation manner of the third aspect, the time-frequency resource of the downlink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.

With reference to the third aspect, in a fourth possible implementation manner of the third aspect, the downlink scheduling DCI further carries indication information, where the indication information is used to indicate that the uplink scheduling DCI is included in the time-frequency region.

In a fourth aspect, a terminal is provided, the terminal comprising a receiver, a processor and a transmitter, wherein:

The receiver is configured to receive an uplink scheduling downlink control information DCI that is sent by the base station in a transmission time interval TTI, where the TTI includes a time-frequency region indicated by a downlink scheduling DCI allocated by the base station to the terminal, The time-frequency resource of the uplink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI;

The processor is configured to control, according to the time-frequency resource indicated by the uplink scheduling DCI, the transmitter to send uplink data to the base station.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the receiver is specifically configured to:

Receiving a signal in a TTI transmitted by the base station;

The processor is further configured to:

And acquiring, in the signal in the time-frequency region indicated by the downlink scheduling DCI, an uplink scheduling DCI corresponding to the terminal, based on the at least one preset location.

With reference to the fourth aspect, in a second possible implementation manner of the fourth aspect, the TTI includes a common control region; if the TTI does not include the downlink scheduling DCI indication allocated by the base station to the terminal a frequency region, where the time-frequency resource of the uplink scheduling DCI is included in the TTI Within the public control area.

With reference to the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the receiver is specifically configured to:

Receiving a signal in a TTI transmitted by the base station;

The processor is further configured to:

In the signal in the common control area, an uplink scheduling DCI corresponding to the terminal is acquired based on at least one preset location stored in advance.

With reference to the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the indicated time-frequency region indicated by the downlink scheduling DCI is a data channel time-frequency region indicated by the downlink scheduling DCI.

With reference to the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the time-frequency resource of the downlink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.

With reference to the fourth aspect, in a sixth possible implementation manner of the fourth aspect, the downlink scheduling DCI further carries indication information, where the indication information is used to indicate that the uplink scheduling DCI is included in the time-frequency region.

A fifth aspect provides a transmission system for downlink control information, where the system includes a base station and a terminal, where:

The base station is configured to determine an uplink scheduling downlink control information DCI corresponding to the terminal, and determine a transmission time interval TTI for transmitting the uplink scheduling DCI; and send the uplink scheduling DCI to the terminal in the TTI, where The time-frequency resource of the uplink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI, if the time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal is included in the TTI;

The terminal is configured to receive uplink scheduling downlink control information DCI sent by the base station in a transmission time interval TTI, and send uplink data to the base station according to the time-frequency resource indicated by the uplink scheduling DCI.

The beneficial effects brought by the technical solutions provided by the embodiments of the present invention are:

In the embodiment of the present invention, the base station determines the uplink scheduling downlink control information DCI corresponding to the terminal, and determines a transmission time interval TTI for transmitting the uplink scheduling DCI, where the base station sends an uplink scheduling DCI to the terminal, where the TTI includes The time-frequency resource indicated by the downlink scheduling DCI allocated by the base station is the time-frequency resource of the uplink scheduling DCI, and the time-frequency resource of the uplink scheduling DCI is located in the time-frequency region indicated by the downlink scheduling DCI. In this way, the base station can set less time-frequency resources for each TTI as a common control area, so that when the actual amount of transmitted data in the common control area has volatility, The time-frequency resources that may be wasted in the common control area are also relatively small, thereby reducing the waste of time-frequency resources.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a schematic diagram of a system framework provided by an embodiment of the present invention;

2 is a schematic structural diagram of a base station according to an embodiment of the present invention;

3 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

4 is a flowchart of a method for transmitting downlink control information according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of time-frequency resources for uplink scheduling DCI according to an embodiment of the present invention; FIG.

6 is a schematic diagram of time-frequency resources of an uplink scheduling DCI according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of time-frequency resources of uplink scheduling DCI according to an embodiment of the present invention.

detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

The embodiment of the present invention provides a method for transmitting downlink control information, which may be implemented by a base station and a terminal, where the base station may be a base station (Base Transceiver Station, referred to as "BTS") in GSM or CDMA, or It is a base station (NodeB, abbreviated as "NB") in WCDMA, and may also be an evolved base station (Evolutional Node B, hereinafter referred to as "eNB or e-NodeB") in LTE. The terminal may also be referred to as a user equipment (User Equipment, referred to as "UE"), a mobile station (Mobile Station, referred to as "MS"), a mobile terminal (Mobile Terminal), etc., and the terminal may be via a radio access network (Radio). An Access Network (referred to as "RAN") communicates with one or more core networks. For example, the terminal may be a mobile phone (or "cellular" phone), a computer with a mobile terminal, etc., for example, the terminal may also be portable. , pocket, handheld, computer built-in or in-vehicle mobile devices that exchange language and/or data with the wireless access network. After determining the uplink scheduling DCI corresponding to the terminal, the base station may send the uplink scheduling DCI to the terminal, and the terminal may receive the uplink scheduling DCI sent by the base station, and further, may send uplink data to the base station according to the uplink scheduling DCI, as shown in FIG. 1 .

The base station can include a processor 210 and a transmitter 220, a receiver 230, and a memory 240. The processor 210 can be coupled to the transmitter 220, the receiver 230, and the memory 240, respectively. As shown in FIG. 2, the transmitter 220 and the receiver 230 can Collectively referred to as transceivers. The transmitter 220 can be used to transmit messages or data, and the transmitter 220 can include, but is not limited to, at least one amplifier, a tuner, one or more oscillators, a coupler, an LNA (Low Noise Amplifier), a duplexer. Wait. The processor 230 can be a control center of the base station, connecting various portions of the entire base station using various interfaces and lines, by running or executing software programs and/or modules stored in the memory 240, and recalling data stored in the memory 240, Perform various functions and processing data of the base station for overall monitoring. In the present invention, the processor 210 may be configured to determine an uplink scheduling DCI corresponding to the terminal and a related process of transmitting a TTI of the uplink scheduling DCI, the processor 210 may include one or more processing units, and the processor 210 may be a general-purpose processor. Including Central Processing Unit (CPU), Network Processor (NP), etc.; can also be digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA) ) or other programmable logic devices. In particular, the program can include program code, the program code including computer operating instructions. The memory 240 can be used to store programs. In particular, the program can include program code, the program code including computer operating instructions. The memory 240 may include RAM, and may also include non-volatile memory, such as at least one disk storage. The processor 230 executes the program code stored in the memory 240 to implement various functions. The base station may also include an antenna 250.

The terminal may include a receiver 310, a transmitter 320, a processor 330, a memory 340, and an input and output unit 350. The receiver 310, the transmitter 320, the memory 340, and the input and output unit 350 may be respectively connected to the processor 330, as shown in FIG. The transmitter 320 and the receiver 310 can be collectively referred to as a transceiver. The receiver 310 can be used to receive messages or data, and the receiver 310 can include, but is not limited to, at least one amplifier, a tuner, one or more oscillators, a coupler, an LNA (Low Noise Amplifier), a duplexer. Wait. Input and output component 350 can be an interactive device in the terminal, such as a screen, keyboard, or the like. The processor 330 may be a control center of the terminal, and connects various parts of the entire terminal by using various interfaces and lines, such as the receiver 310 and the transmitter 320, etc., may be a control center of the terminal, and connects the entire terminal by using various interfaces and lines. The various components perform overall monitoring by executing or executing software programs and/or modules stored in the memory 340, as well as invoking data stored in the memory 340, performing various functions and processing data of the terminal. In the present invention, the processor 330 may be configured to acquire related processing of the uplink scheduling DCI. Optionally, the processor 330 may include one or more processing units; preferably, the processor 330 may integrate the application processor and the modem. Processor, where The application processor mainly processes the operating system, and the modem processor mainly processes wireless communication. Processor 330 can also be a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device or the like. Memory 340 can be used to store programs. In particular, the program can include program code, the program code including computer operating instructions. Memory 340 may include RAM and may also include non-volatile memory, such as at least one disk storage. The processor 330 executes the program code stored in the memory 340 to implement various functions. The terminal may also include an antenna 360.

The technical solution of the embodiment of the present invention can be applied to various communication systems, for example, Global System of Mobile communication ("GSM") system, Code Division Multiple Access (CDMA). System, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service ("GPRS"), Long Term Evolution (Long Term Evolution, referred to as "Long Term Evolution" LTE") system, LTE Frequency Division Duplex ("FDD") system, LTE Time Division Duplex ("TDD"), Universal Mobile Telecommunication System (Universal Mobile Telecommunication System) It is "UMTS", and other wireless communication systems using orthogonal frequency division (OFDM) technology.

In order to facilitate the understanding of the embodiments of the present invention, the basic concepts involved in the embodiments of the present invention are first described below. The LTE system is taken as an example, but the embodiment of the present invention is not applicable to the LTE system. In fact, any wireless communication system that performs data transmission by scheduling may adopt the solution provided by the embodiment of the present invention.

First, the aggregation level

The size of the DCI (that is, the size of the time-frequency resource occupied by the DCI) can be changed. The base station can determine the size of the DCI according to the channel condition or the location of the terminal. The size of the time-frequency resource of the DCI can be represented by CCE (Control Channel Element). A DCI can include 6, 12, 8 or 16 CCEs. There are 4 aggregation levels (the four aggregation levels can be used separately for AL1). , AL2, AL4, AL8), the purpose of the base station using DCI of different aggregation levels is to enable the terminals under different channel conditions to receive DCI correctly. When the channel conditions are relatively poor, more time-frequency resources can be used to transmit DCI, for example, 16 CCE DCIs can be used.

Second, the physical channel and physical signals

The physical channel carries data information from higher layers, and the physical channel may be a physical uplink share channel (PUSCH). A physical uplink control channel (PUCCH), a physical downlink control channel (PDCCH), or a physical downlink shared channel (PDSCH). The uplink scheduling DCI is carried on the PDCCH.

The processing flow shown in FIG. 4 will be described in detail below with reference to specific implementations, and the content can be as follows:

Step 401: The base station determines an uplink scheduling DCI corresponding to the terminal, and determines a TTI for transmitting the uplink scheduling DCI.

In an implementation, when the terminal needs to send the uplink data to the base station, the terminal may send an uplink scheduling request to the base station, and after receiving the uplink scheduling request sent by the terminal, the base station may determine the uplink scheduling DCI corresponding to the terminal, where the uplink scheduling DCI may be included. The control information such as the time, the frequency resource, and the modulation and coding mode used by the terminal to send the uplink data, and the TTI for transmitting the uplink scheduling DCI may be determined, where the duration of the TTI may be less than 1 millisecond.

In addition, when the base station has the downlink service data that needs to be sent to the terminal, the downlink scheduling DCI may be sent to the terminal, where the downlink scheduling DCI may include the time, the frequency resource, the modulation and coding mode, and the like of the downlink service data that the terminal needs to receive. For the control information, the terminal may receive the downlink scheduling DCI sent by the base station, and further, may receive the downlink service data sent by the base station on the time-frequency resource indicated by the downlink scheduling DCI.

Step 402: The base station sends an uplink scheduling DCI to the terminal in the TTI, where the time-frequency resource of the uplink scheduling DCI is located when the downlink scheduling DCI is indicated, if the TTI includes the time-frequency region indicated by the downlink scheduling DCI allocated by the base station. In the frequency range.

In an implementation, after determining, by the base station, the uplink scheduling DCI, the base station may send the uplink scheduling DCI to the terminal within the determined TTI. Specifically, the base station may determine, according to whether the time-frequency region indicated by the downlink scheduling DCI of the terminal is in the TTI, determine the time-frequency resource of the uplink scheduling DCI, and if the TTI that sends the uplink scheduling DCI includes the time-frequency region corresponding to the terminal, The time-frequency region is indicated by the downlink scheduling DCI corresponding to the terminal. The downlink scheduling DCI may include a time domain range and a frequency domain range corresponding to the terminal, where the time-frequency region may be included in the downlink scheduling DCI. The time-frequency resources of the uplink scheduling DCI are configured in the time-frequency region corresponding to the terminal, that is, if the base station sends the uplink scheduling DCI to the terminal within the TTI, The TTI sends to the terminal Sending downlink service data (in which the base station sends downlink service data to the terminal in a time-frequency region corresponding to the downlink scheduling DCI indication of the terminal), the time-frequency region corresponding to the terminal may be punctured or rate matched (rate) The matching processing, that is, the uplink scheduling DCI can be sent in a certain time-frequency resource block in the time-frequency region, as shown in FIG. 5.

Optionally, the time-frequency region indicated by the downlink scheduling DCI may be a data channel time-frequency region indicated by the downlink scheduling DCI, where the data channel time-frequency region may be a time range and a frequency range corresponding to the data channel allocated by the base station for the terminal. The determined time-frequency region (time-frequency resource block) may also be a PDSCH time-frequency region.

Optionally, the time-frequency resource of the downlink scheduling DCI may be located in a time-frequency region indicated by the downlink scheduling DCI, where the time-frequency region including the downlink scheduling DCI may be referred to as a self-inclusive time-frequency region. If the time-frequency region of the corresponding terminal is included in the TTI of the uplink scheduling DCI, the time-frequency resources of the uplink scheduling DCI and the downlink scheduling DCI may be located in the time-frequency region, in other words, if included in the TTI for transmitting the uplink scheduling DCI. The time-frequency resource of the uplink scheduling DCI may be located in the self-included time-frequency region, as shown in FIG. 6 .

Optionally, the common control region may be included in the TTI. If the time-frequency region indicated by the downlink scheduling DCI allocated by the base station for the terminal is not included in the TTI, the time-frequency resource of the uplink scheduling DCI is located in the common control region included in the TTI.

In an implementation, the base station may allocate a certain proportion of the common control area for each TTI, as shown in FIG. 7, where the common control area may be used to send uplink scheduling information or downlink scheduling information, if the TTI of the uplink scheduling DCI is transmitted. If the time-frequency region corresponding to the downlink scheduling DCI indication of the terminal is not included, the time-frequency resource of the uplink scheduling DCI may be configured in the common control region. It should be noted that the time-frequency region corresponding to the downlink scheduling DCI indication of the terminal is not included in the TTI, and may include a time-frequency region corresponding to the downlink scheduling DCI indication of other terminals.

Optionally, the base station may further preset a possible specific location of the uplink scheduling DCI in the time-frequency region (or the PDSCH time-frequency region), and may combine multiple possible location combinations into the search space of the uplink scheduling DCI. Each possible position in the search space may be represented by an aggregation level and a relative position, wherein the relative position may be a relative position (relative time and relative frequency) of the start position of the uplink scheduling DCI and the time-frequency region (or the PDSCH time-frequency region) The location may be, for example, a symbol offset and a frequency offset of the uplink scheduling DCI relative to the start position of the time-frequency region (or the PDSCH time-frequency region). For example, the search space may include the following possible locations: AL1, symbol 0, carrier 4), (AL1, symbol 2, carrier 16), (AL2, symbol 2, carrier 8), where the parameters in parentheses are divided into It does not indicate the aggregation level, the offset of the uplink scheduling DCI relative to the start symbol of the time-frequency region (or PDSCH time-frequency region), and the index offset of the starting carrier. In addition, the uplink scheduling DCI may also adopt a distributed transmission mode, that is, the time-frequency resources of the uplink scheduling DCI may be dispersedly arranged in the time-frequency region (or the PDSCH time-frequency region). Regardless of the manner in which the uplink scheduling DCI is transmitted, the base station needs to predefine a search space that can determine the time-frequency resources occupied by the uplink scheduling DCI. In addition, in order to simplify the communication system and implement it easily, the base station may also define a specific location of the uplink scheduling DCI in advance. The pre-defined search space, the base station can notify the terminal in the following manners: the search space can be defined in the system message, and the RRC (Radio Resource Control) message can be sent to the terminal corresponding to the DCI in advance to define the search. space.

Optionally, the downlink scheduling DCI may further include indication information, where the indication information may be used to indicate that the uplink scheduling DCI is included in the time-frequency region of the corresponding terminal, in order to improve the correct rate of the uplink scheduling DCI. Specifically, the base station may add a bit indication to the downlink scheduling DCI to indicate whether the uplink scheduling DCI is included in the time-frequency region of the corresponding terminal. Specifically, the bit may be added in the downlink scheduling DCI, and the value is represented by the value of the bit. Whether the uplink scheduling DCI is included in the time-frequency region, for example, when the value of the bit is “0”, it indicates that the uplink scheduling DCI is not included in the time-frequency region, and when the value of the bit is “1”, the time-frequency is indicated. The uplink scheduling DCI is included in the area. In addition, the base station may further set a power offset for the uplink scheduling DCI, so that the uplink scheduling DCI transmission power is greater than the transmission power of the downlink service data carried in the time-frequency region. The time-frequency resource of the uplink scheduling DCI can also be configured in the vicinity of the time-frequency resource of the downlink reference signal.

Step 403: The terminal receives the uplink scheduling DCI sent by the base station in the TTI, where the time-frequency resource of the uplink scheduling DCI is located when the downlink scheduling DCI is indicated, if the TTI includes the time-frequency region indicated by the downlink scheduling DCI allocated by the base station. In the frequency range.

In an implementation, after the base station sends the uplink scheduling DCI to the terminal, the terminal may receive the uplink scheduling DCI sent by the base station, where the time-frequency of the uplink scheduling DCI is scheduled if the TTI includes the time-frequency region indicated by the downlink scheduling DCI allocated by the base station for the terminal. The resource is located in the time-frequency region indicated by the downlink scheduling DCI.

Optionally, the time-frequency resource of the downlink scheduling DCI may be located in a time-frequency region indicated by the downlink scheduling DCI, where the time-frequency region including the downlink scheduling DCI may be referred to as a self-inclusive time-frequency region. Such as If the time-frequency region of the corresponding terminal is included in the TTI of the uplink scheduling DCI, the time-frequency resources of the uplink scheduling DCI and the downlink scheduling DCI may be located in the time-frequency region, in other words, if included in the TTI for transmitting the uplink scheduling DCI. The time-frequency resource of the uplink scheduling DCI may be located in the self-included time-frequency region.

Optionally, the terminal may obtain the uplink scheduling DCI sent by the base station in the time-frequency region. Correspondingly, the process in step 403 may be as follows: the terminal receives the signal in the TTI sent by the base station; and the terminal schedules the time-frequency region indicated by the DCI in the downlink. The uplink scheduling DCI of the corresponding terminal is obtained based on the at least one preset location in the signal.

In an implementation, the base station may send the uplink scheduling DCI in the time-frequency region indicated by the downlink scheduling DCI, or may send the uplink scheduling DCI in the common control region, or may not send the uplink scheduling DCI to the terminal in the TTI. The terminal can receive the signal in the TTI sent by the base station, and then perform a blind check on the signal in the TTI to determine whether the uplink scheduling DCI corresponding to the terminal is included in the TTI, where the terminal can schedule the DCI according to the foregoing predefined uplink scheduling. The corresponding search space detects signals in the time-frequency region (or PDSCH time-frequency region) indicated by the downlink scheduling DCI.

Specifically, the terminal may determine, according to the downlink scheduling DCI of the corresponding terminal, the time-frequency region (or the PDSCH time-frequency region) indicated by the downlink scheduling DCI, and then, according to the starting position of the time-frequency region, and the pre-stored uplink scheduling DCI. The number of possible locations (including the aggregation level and the relative location) included in the search space, and the time-frequency resources corresponding to each possible location of the uplink scheduling DCI (ie, the time-frequency resources occupied by the uplink scheduling DCI) are calculated, and then, respectively, The DCI decoding is performed on the signal in the time-frequency resource corresponding to each possible location. If the decoding is correct, the terminal can correctly obtain the uplink scheduling DCI sent by the base station. Further, after the terminal correctly acquires the uplink scheduling DCI at a certain location, The signal on the time-frequency resource occupied by the uplink scheduling DCI may be removed from the signal in the time-frequency region (or the PDSCH time-frequency region) indicated by the downlink scheduling DCI, and further, the downlink service data may be decoded in the remaining signals. If the decoding passes the check, it indicates that the terminal can correctly receive the downlink service data sent by the base station. If the check fails, the terminal is not correct. Downlink traffic data received from the base station, at this time, the terminal may send a NACK to the base station (reception error) feedback message, requesting the base station to resend the downlink service data. In addition, after determining the corresponding time-frequency region, the terminal may first perform downlink service data decoding on the signal in the time-frequency region. If the decoding is correct, it indicates that the time-frequency region does not include the uplink scheduling DCI, and the terminal may no longer be in the terminal. The uplink scheduling DCI is detected in the signal in the time-frequency region (or the PDSCH time-frequency region). If the decoding is incorrect, the terminal may perform the signal in the time-frequency region (or the PDSCH time-frequency region) according to the method for detecting the uplink scheduling DCI. The uplink scheduling DCI is detected.

It should be noted that, in the foregoing method for detecting the uplink scheduling DCI, after the terminal determines the time-frequency region (or the PDSCH time-frequency region) indicated by the downlink scheduling DCI, the terminal first detects the uplink scheduling DCI at each possible location, and then detects the downlink service data. . After determining the time-frequency region (or the PDSCH time-frequency region) of the downlink scheduling DCI indication, the terminal may first detect the downlink service data, and then detect the uplink scheduling DCI. The specific method may be as follows: after the terminal determines the time-frequency region (or the PDSCH time-frequency region) indicated by the downlink scheduling DCI, the terminal may be included according to the starting location of the time-frequency region and the pre-stored uplink scheduling DCI search space. a possible location (including an aggregation level and a relative location), and calculating a time-frequency resource corresponding to each possible location of the uplink scheduling DCI (ie, a time-frequency resource occupied by the uplink scheduling DCI), and further, for each possible location, the terminal may The signal in the time-frequency region (or the PDSCH time-frequency region) indicated by the downlink scheduling DCI is used to remove the signal on the time-frequency resource corresponding to the possible location, and further, the downlink service data decoding may be performed in the remaining signal, if decoding By verifying, the terminal can correctly receive the downlink service data sent by the base station. Further, after the terminal correctly obtains the downlink service data, the terminal can perform DCI decoding on the signal on the time-frequency resource corresponding to the possible location. The terminal can obtain the uplink scheduling DCI sent by the base station. If the decoding is incorrect, the terminal does not correctly receive the uplink sent by the base station. Of DCI. If the terminal does not decode correctly when performing downlink service data decoding for each possible location, it indicates that the terminal does not correctly receive the downlink service data sent by the base station. For this method, if the terminal does not decode the downlink service data for each possible location, the terminal may perform DCI decoding on the signal on the time-frequency resource corresponding to each possible location included in the search space. If the decoding is correct at a certain location, the terminal can acquire the uplink scheduling DCI sent by the base station.

Optionally, in order to improve the correct rate of receiving the uplink scheduling DCI, the downlink scheduling DCI may further include indication information, where the indication information is used to indicate that the time-frequency region includes the uplink scheduling DCI. Specifically, the base station may add a bit indication in the downlink scheduling DCI to indicate that the time-frequency region of the corresponding terminal is The uplink scheduling DCI is included. Specifically, the bit can be added in the downlink scheduling DCI, and the value of the bit indicates whether the uplink scheduling DCI is included in the time-frequency region. For example, when the value of the bit is “0”, It indicates that the uplink scheduling DCI is not included in the time-frequency region. When the value of the bit is "1", it indicates that the time-frequency region includes the uplink scheduling DCI. In this way, after the terminal correctly receives the downlink scheduling DCI of the corresponding terminal, it may determine whether to perform DCI decoding on the signal in the time-frequency region (or the PDSCH time-frequency region) indicated by the downlink scheduling DCI according to the indication in the downlink scheduling DCI. If the downlink scheduling DCI indicates that there is no uplink scheduling DCI in the time-frequency region (or the PDSCH time-frequency region), the terminal may perform DCI decoding on the signal in the downlink, thereby improving processing efficiency.

Optionally, optionally, the TTI may include a common control region. If the time-frequency region indicated by the downlink scheduling DCI allocated by the base station for the terminal is not included in the TTI, the time-frequency resource of the uplink scheduling DCI is located in the public included in the TTI. Within the control area.

In an implementation, the base station may allocate a certain proportion of the common control area for each TTI, where the common control area may be used to send uplink scheduling information or downlink scheduling information, if the downlink scheduling DCI indication is not included in the TTI for transmitting the uplink scheduling DCI. In the time-frequency region, the time-frequency resources of the uplink scheduling DCI can be configured in the common control region. It should be noted that the time-frequency region corresponding to the downlink scheduling DCI indication of the terminal is not included in the TTI, and may include a time-frequency region corresponding to the downlink scheduling DCI indication of other terminals.

Optionally, for the case that the base station sends the uplink scheduling DCI in the common control area, correspondingly, the process of step 403 may be as follows: the terminal receives the signal in the TTI sent by the base station; and the terminal in the signal in the common control area is based on the advance The stored at least one preset location acquires an uplink scheduling DCI of the corresponding terminal.

In an implementation, the terminal may receive the signal in the TTI sent by the base station. When the time-frequency region (or the PDSCH time-frequency region) corresponding to the terminal is not included in the TTI, the terminal may be in the signal in the common control region, based on the advance. The stored at least one preset location acquires an uplink scheduling DCI of the corresponding terminal.

Step 404: The terminal sends uplink data to the base station according to the time domain resource indicated by the uplink scheduling DCI.

In the implementation, after receiving the uplink scheduling DCI sent by the base station, the terminal may send the uplink data on the time-frequency resource indicated by the uplink scheduling DCI.

In the embodiment of the present invention, the base station determines the uplink scheduling downlink control information DCI corresponding to the terminal, and determines a transmission time interval TTI for transmitting the uplink scheduling DCI, where the base station sends an uplink scheduling DCI to the terminal, where the TTI includes The time-frequency region indicated by the downlink scheduling DCI allocated by the base station, the time-frequency resource of the uplink scheduling DCI is located in the downlink scheduling DCI index In the time-frequency range shown. In this way, the base station can set less time-frequency resources for each TTI as a common control region, so that when the actual amount of transmitted data in the common control region has volatility, the time-frequency resources that may be wasted in the common control region are also compared. Less, thus, can reduce the waste of time-frequency resources.

Based on the same concept, the embodiment of the present invention further provides a base station. As shown in FIG. 2, the base station provided in this embodiment may implement the process of the embodiment shown in FIG. 4 of the present invention, where the base station includes a processor 210 and a transmitter. 220, where:

The processor 210 is configured to determine uplink scheduling downlink control information DCI corresponding to the terminal, and determine a transmission time interval TTI for transmitting the uplink scheduling DCI;

The transmitter 220 is configured to send an uplink scheduling DCI to the terminal in the TTI, where, if the TTI includes a time-frequency region indicated by a downlink scheduling DCI allocated by the base station to the terminal, The time-frequency resource of the uplink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.

In the implementation, when the terminal needs to send the uplink data to the base station, the terminal may send an uplink scheduling request to the base station. After receiving the uplink scheduling request sent by the terminal, the processor 210 may determine the uplink scheduling DCI corresponding to the terminal, where the uplink scheduling DCI is performed. The control information such as the time, the frequency resource, and the modulation and coding mode used by the terminal to send the uplink data may be included, and the TTI for transmitting the uplink scheduling DCI may be determined, where the duration of the TTI may be less than 1 millisecond. After determining the uplink scheduling DCI, the processor 210 may send the uplink scheduling DCI to the terminal within the determined TTI. Specifically, the processor 210 may determine, according to whether the time-frequency region indicated by the downlink scheduling DCI of the terminal is within the TTI, determine a time-frequency resource of the uplink scheduling DCI, and if the TTI of the uplink scheduling DCI is included, include a time-frequency corresponding to the terminal. The area (where the time-frequency area is indicated by the downlink scheduling DCI corresponding to the terminal), the time-frequency resource of the uplink scheduling DCI may be configured in the time-frequency area corresponding to the terminal, that is, if the base station is in the The TTI sends the uplink scheduling DCI to the terminal, and also sends the downlink service data to the terminal (where the base station sends the downlink service data to the terminal in the time-frequency region corresponding to the downlink scheduling DCI indication of the terminal), and the corresponding terminal can be The time-frequency region performs a puncture or rate matching process, that is, an uplink scheduling DCI can be sent in a certain time-frequency resource block in the time-frequency region.

Optionally, the time-frequency region indicated by the downlink scheduling DCI is a data channel time-frequency region indicated by the downlink scheduling DCI.

Optionally, the time-frequency resource of the downlink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.

In an implementation, the time-frequency resource of the downlink scheduling DCI may be located in a time-frequency region indicated by the downlink scheduling DCI, where the time-frequency region including the downlink scheduling DCI may be referred to as a self-inclusive time-frequency region. If the time-frequency region of the corresponding terminal is included in the TTI of the uplink scheduling DCI, the time-frequency resources of the uplink scheduling DCI and the downlink scheduling DCI may be located in the time-frequency region, in other words, if included in the TTI for transmitting the uplink scheduling DCI. The time-frequency resource of the uplink scheduling DCI may be located in the self-included time-frequency region.

Optionally, the TTI includes a common control area;

In an implementation, the base station may also preset a specific location of the uplink scheduling DCI in the time-frequency region (or the PDSCH time-frequency region), and may combine multiple possible location combinations into the search space of the uplink scheduling DCI. Each possible position in the search space may be represented by an aggregation level and a relative position, wherein the relative position may be a relative position (relative time and relative frequency) of the start position of the uplink scheduling DCI and the time-frequency region (or the PDSCH time-frequency region) The location may be, for example, a symbol offset and a frequency offset of the uplink scheduling DCI relative to the start position of the time-frequency region (or the PDSCH time-frequency region). For example, the search space may include the following possible locations: AL1, symbol 0, carrier 4), (AL1, symbol 2, carrier 16), (AL2, symbol 2, carrier 8), where the parameters in parentheses indicate the aggregation level, the uplink scheduling DCI relative to the time-frequency region (or The PDSCH time-frequency region) is the offset of the start symbol and the index offset of the start carrier. In addition, the uplink scheduling DCI may also adopt a distributed transmission mode, that is, the time-frequency resources of the uplink scheduling DCI may be dispersedly arranged in the time-frequency region (or the PDSCH time-frequency region). Regardless of the manner in which the uplink scheduling DCI is transmitted, the base station needs to predefine a search space that can determine the time-frequency resources occupied by the uplink scheduling DCI. In addition, in order to simplify the communication system and implement it easily, the base station may also define a specific location of the uplink scheduling DCI in advance. The pre-defined search space, the base station can notify the terminal in the following manners: the search space can be defined in the system message, and the RRC (Radio Resource Control) message can be sent to the terminal corresponding to the DCI in advance to define the search. space.

Optionally, the downlink scheduling DCI carries indication information, where the indication information is used to indicate that the uplink scheduling DCI is included in the time-frequency region.

In the implementation, in order to improve the correct rate of receiving the uplink scheduling DCI, the downlink scheduling DCI may include indication information, where the indication information may be used to indicate that the time-frequency region corresponding to the terminal includes the uplink scheduling DCI. Specifically, the base station may add a bit indication to the downlink scheduling DCI to indicate whether the uplink scheduling DCI is included in the time-frequency region of the corresponding terminal. Specifically, the bit may be added in the downlink scheduling DCI, and the value is represented by the value of the bit. Whether the uplink scheduling DCI is included in the time-frequency region, for example, when the value of the bit is “0”, it indicates that the uplink scheduling DCI is not included in the time-frequency region, and when the value of the bit is “1”, the time-frequency is indicated. The uplink scheduling DCI is included in the area. In addition, the base station may further set a power offset for the uplink scheduling DCI, so that the uplink scheduling DCI transmission power is greater than the transmission power of the downlink service data carried in the time-frequency region. The time-frequency resource of the uplink scheduling DCI can also be configured in the vicinity of the time-frequency resource of the downlink reference signal.

Based on the same technical concept, the embodiment of the present invention further provides a terminal. As shown in FIG. 3, the terminal provided in this embodiment can implement the process of the embodiment shown in FIG. 4 of the present invention. The terminal includes a receiver 310 and processes. And a transmitter 320, wherein:

The receiver 310 is configured to receive uplink scheduling downlink control information DCI sent by the base station in a transmission time interval TTI, where the TTI includes a time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal. The time-frequency resource of the uplink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI;

The processor 330 is configured to control the transmitter 320 to send uplink data to the base station based on time-frequency resources indicated by the uplink scheduling DCI.

In an implementation, after the base station sends the uplink scheduling DCI to the terminal, the receiver 310 may receive the uplink scheduling DCI sent by the base station, where the time-frequency resource of the uplink scheduling DCI is located in the time-frequency included in the TTI indicated by the downlink scheduling DCI of the corresponding terminal. within the area. After receiving the uplink scheduling DCI sent by the base station, the processor 330 may control the transmitter 320 to send uplink data to the base station according to the time-frequency resource indicated by the uplink scheduling DCI.

Optionally, the receiver 310 is specifically configured to:

Receiving a signal in a TTI transmitted by the base station;

The processor 330 is further configured to:

In an implementation, the base station may send the uplink scheduling DCI in the time-frequency region indicated by the downlink scheduling DCI, or may send the uplink scheduling DCI in the common control region, or may not send the uplink scheduling DCI to the terminal in the TTI. The receiver 310 can receive the signal in the TTI sent by the base station, and the processor 330 can perform blind detection on the signal in the TTI to determine whether the uplink scheduling DCI corresponding to the terminal is included in the TTI, where the terminal can be pre-defined according to the foregoing. A good uplink scheduling DCI corresponding search space detects signals in a time-frequency region (or PDSCH time-frequency region) indicated by the downlink scheduling DCI.

In addition, if the terminal performs DCI decoding on the signals in the time-frequency resources corresponding to all possible locations in the search space, and the decoding is not correct, the terminal may schedule the time-frequency region indicated by the DCI from the downlink for each possible location ( Or the signal in the PDSCH time-frequency region) cancels the signal on the time-frequency resource corresponding to the location, and further, the downlink service data can be decoded in the remaining signal, if a certain time If the decoding is verified, the terminal can correctly receive the downlink service data sent by the base station. If all the packets are not verified, the terminal does not correctly receive the downlink service data sent by the base station. At this time, the terminal can send a NACK to the base station. Error) The feedback message requests the base station to resend the downlink service data.

Optionally, the TTI includes a common control region; if the time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal is not included in the TTI, the time-frequency resource of the uplink scheduling DCI is located. Within the common control area included within the TTI.

Optionally, the receiver 310 is specifically configured to:

Receiving a signal in a TTI transmitted by the base station;

The processor 330 is further configured to:

In the embodiment of the present invention, the base station determines the uplink scheduling downlink control information DCI corresponding to the terminal, and determines a transmission time interval TTI for transmitting the uplink scheduling DCI, where the base station sends an uplink scheduling DCI to the terminal, where the TTI includes The time-frequency resource indicated by the downlink scheduling DCI allocated by the base station is the time-frequency resource of the uplink scheduling DCI, and the time-frequency resource of the uplink scheduling DCI is located in the time-frequency region indicated by the downlink scheduling DCI. In this way, the base station can set less time-frequency resources for each TTI as a common control region, so that when the actual amount of transmitted data in the common control region has volatility, the time-frequency resources that may be wasted in the common control region are also compared. Less, thus, can reduce the waste of time-frequency resources.

Based on the same technical concept, the embodiment of the present invention further provides a transmission system for downlink control information. The system provided in this embodiment can implement the process of the embodiment shown in FIG. 4 of the present invention, and the base station is the embodiment shown in FIG. A base station, the terminal is a terminal in the embodiment shown in FIG. 3, the system includes a base station and a terminal, where:

In an implementation, when the terminal needs to send the uplink data to the base station, the terminal may send an uplink scheduling request to the base station, and after receiving the uplink scheduling request sent by the terminal, the base station may determine the uplink scheduling DCI corresponding to the terminal, where the uplink scheduling DCI may be included. The control information such as the time, the frequency resource, and the modulation and coding mode used by the terminal to send the uplink data, and the TTI for transmitting the uplink scheduling DCI may be determined, where the duration of the TTI may be less than 1 millisecond. After determining the uplink scheduling DCI, the base station may send the uplink scheduling DCI to the terminal in the determined TTI. Specifically, the base station can perform downlink adjustment according to the corresponding terminal. Whether the time-frequency region indicated by the degree DCI is within the TTI, determining the time-frequency resource of the uplink scheduling DCI, and if the TTI for transmitting the uplink scheduling DCI includes the time-frequency region corresponding to the terminal (where the time-frequency region is corresponding to the terminal) The downlink scheduling DCI time-frequency resource may be configured in the time-frequency region of the corresponding terminal, that is, if the base station sends the uplink scheduling DCI to the terminal in the TTI, the TTI is also in the TTI direction. The terminal sends the downlink service data (where the base station sends the downlink service data to the terminal in the time-frequency region corresponding to the downlink scheduling DCI indication of the terminal), and the time-frequency region corresponding to the terminal can be punctured or rate matched ( Rate matching processing, that is, an uplink scheduling DCI can be sent in a certain time-frequency resource block in the time-frequency region. After the base station sends the uplink scheduling DCI to the terminal, the terminal may receive the uplink scheduling DCI sent by the base station, where the time-frequency resource of the uplink scheduling DCI is located in the time-frequency region included in the TTI indicated by the downlink scheduling DCI of the corresponding terminal. After receiving the uplink scheduling DCI sent by the base station, the terminal may send uplink data to the base station according to the uplink scheduling DCI.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium. The storage medium mentioned may be read only 1, a magnetic disk or an optical disk or the like.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

A method for transmitting downlink control information, characterized in that the method comprises:

Determining, by the base station, the uplink scheduling downlink control information DCI corresponding to the terminal, and determining a transmission time interval TTI for transmitting the uplink scheduling DCI;

The base station sends the uplink scheduling DCI to the terminal in the TTI, where the uplink includes the time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal, The time-frequency resource for scheduling the DCI is located in the time-frequency region indicated by the downlink scheduling DCI.
The method according to claim 1, wherein the TTI includes a common control area;

If the time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal is not included in the TTI, the time-frequency resource of the uplink scheduling DCI is located in a common control region included in the TTI.
The method according to claim 1, wherein the time-frequency region indicated by the downlink scheduling DCI is a data channel time-frequency region indicated by the downlink scheduling DCI.
The method according to claim 1, wherein the time-frequency resource of the downlink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.
The method according to any one of the preceding claims, wherein the downlink scheduling DCI further carries indication information, where the indication information is used to indicate that the uplink scheduling DCI is included in the time-frequency region.
A method for transmitting downlink control information, characterized in that the method comprises:

The terminal receives the uplink scheduling downlink control information DCI sent by the base station in the transmission time interval TTI, where the uplink scheduling DCI is included if the TTI includes the time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal. The time-frequency resource is located in a time-frequency region indicated by the downlink scheduling DCI;

The terminal sends uplink data to the base station based on the time-frequency resource indicated by the uplink scheduling DCI.
The method according to claim 6, wherein the terminal receives an uplink scheduling DCI sent by the base station in the TTI, including:

Receiving, by the terminal, a signal in a TTI sent by the base station;

The terminal acquires an uplink scheduling DCI corresponding to the terminal, based on the at least one preset location, in the signal in the time-frequency region indicated by the downlink scheduling DCI.
The method according to claim 6, wherein the TTI includes a common control region; if the TTI does not include a time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal, The time-frequency resources of the uplink scheduling DCI are located in a common control area included in the TTI.
The method according to claim 8, wherein the terminal receives an uplink scheduling DCI sent by the base station in the TTI, including:

Receiving, by the terminal, a signal in a TTI sent by the base station;

The terminal acquires an uplink scheduling DCI corresponding to the terminal, based on the at least one preset location stored in advance in the signal in the common control area.
The method according to claim 6, wherein the time-frequency region indicated by the downlink scheduling DCI is a data channel time-frequency region indicated by the downlink scheduling DCI.
The method according to claim 6, wherein the time-frequency resource of the downlink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.
The method according to claim 6, wherein the downlink scheduling DCI further carries indication information, where the indication information is used to indicate that the uplink scheduling DCI is included in the time-frequency region.
A base station, characterized in that the base station comprises a processor and a transmitter, wherein:

The processor is configured to determine an uplink scheduling downlink control information DCI corresponding to the terminal, and determine a transmission time interval TTI for transmitting the uplink scheduling DCI;

The transmitter is configured to send the uplink scheduling DCI to the terminal in the TTI, where the TTI includes a time-frequency region indicated by a downlink scheduling DCI allocated by the base station to the terminal, The time-frequency resource of the uplink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.
The base station according to claim 13, wherein the TTI includes a common control area;

If the time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal is not included in the TTI, the time-frequency resource of the uplink scheduling DCI is located in a common control region included in the TTI.
The base station according to claim 13, wherein said downlink scheduling DCI indicates The time-frequency region is a data channel time-frequency region indicated by the downlink scheduling DCI.
The base station according to claim 13, wherein the time-frequency resource of the downlink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI.
The base station according to claim 13, wherein the downlink scheduling DCI further carries indication information, where the indication information is used to indicate that the uplink scheduling DCI is included in the time-frequency region.
A terminal, characterized in that the terminal comprises a receiver, a processor and a transmitter, wherein:

The receiver is configured to receive an uplink scheduling downlink control information DCI that is sent by the base station in a transmission time interval TTI, where the TTI includes a time-frequency region indicated by a downlink scheduling DCI allocated by the base station to the terminal, The time-frequency resource of the uplink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI;

The processor is configured to control, according to the time-frequency resource indicated by the uplink scheduling DCI, the transmitter to send uplink data to the base station.
The terminal according to claim 18, wherein the receiver is specifically configured to:

Receiving a signal in a TTI transmitted by the base station;

The processor is further configured to:

And acquiring, in the signal in the time-frequency region indicated by the downlink scheduling DCI, an uplink scheduling DCI corresponding to the terminal, based on the at least one preset location.
The terminal according to claim 18, wherein the TTI includes a common control region; if the TTI does not include a time-frequency region indicated by a downlink scheduling DCI allocated by the base station to the terminal, The time-frequency resources of the uplink scheduling DCI are located in a common control area included in the TTI.
The terminal according to claim 20, wherein the receiver is specifically configured to:

Receiving a signal in a TTI transmitted by the base station;

The processor is further configured to:

In the signal in the common control area, an uplink scheduling DCI corresponding to the terminal is acquired based on at least one preset location stored in advance.
The terminal according to claim 18, wherein the time-frequency region indicated by the downlink scheduling DCI is a data channel time-frequency region indicated by the downlink scheduling DCI.
The terminal according to claim 18, wherein the time frequency of the downlink scheduling DCI The resource is located in the time-frequency region indicated by the downlink scheduling DCI.
The terminal according to claim 18, wherein the downlink scheduling DCI further carries indication information, where the indication information is used to indicate that the uplink scheduling DCI is included in the time-frequency region.
A transmission system for downlink control information, characterized in that the system comprises a base station and a terminal, wherein:

The base station is configured to determine an uplink scheduling downlink control information DCI corresponding to the terminal, and determine a transmission time interval TTI for transmitting the uplink scheduling DCI; and send the uplink scheduling DCI to the terminal in the TTI, where The time-frequency resource of the uplink scheduling DCI is located in a time-frequency region indicated by the downlink scheduling DCI, if the time-frequency region indicated by the downlink scheduling DCI allocated by the base station to the terminal is included in the TTI;

The terminal is configured to receive uplink scheduling downlink control information DCI sent by the base station in a transmission time interval TTI, and send uplink data to the base station according to the time-frequency resource indicated by the uplink scheduling DCI.