CN105493594B - Transmission method, system, base station and the terminal of Downlink Control Information - Google Patents

Transmission method, system, base station and the terminal of Downlink Control Information Download PDF

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Publication number
CN105493594B
CN105493594B CN201480028984.2A CN201480028984A CN105493594B CN 105493594 B CN105493594 B CN 105493594B CN 201480028984 A CN201480028984 A CN 201480028984A CN 105493594 B CN105493594 B CN 105493594B
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resource
dci
terminal
blind detection
frequency band
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CN105493594A (en
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孙伟
吕永霞
张雯
温容慧
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/22—Arrangements affording multiple use of the transmission path using time-division multiplexing
    • H04L5/26—Arrangements affording multiple use of the transmission path using time-division multiplexing combined with the use of different frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention provides a kind of transmission method of Downlink Control Information, system, base station and terminals, the base station includes: processing unit, for determining first resource, the first resource includes at least one physical mixed autonomous retransmission indication signal PHICH resource, wherein, the first resource is for sending at least one Downlink Control Information DCI；Transmission unit sends at least one described DCI to terminal for utilizing the first resource, wherein at least one described DCI is used to indicate the terminal and receives downlink data or send upstream data.Technical solution provided by the invention improves the utilization rate of PHICH resource to realize.

Description

Transmission method, system, base station and terminal of downlink control information
Technical Field
The present invention relates to mobile communication technologies, and in particular, to a method, a system, a base station, and a terminal for transmitting downlink control information.
Background
In the prior art, in a Frequency Division Duplex (FDD) system, an uplink Frequency band and a downlink Frequency band occupy the same bandwidth, but the amount of uplink data is greatly less than that of downlink data, so that part of resources in the uplink Frequency band are free. In order to solve the problem, a flexible duplex technology is currently applied to the FDD system, and the scheme of the flexible duplex technology is as follows: and allowing downlink data to be transmitted in a part of subframes of the uplink frequency band to improve channel capacity of the mobile communication system.
In the FDD system, a terminal transmits uplink data to a base station through a Physical Downlink shared Channel (PUSCH), and then the base station transmits a Hybrid Automatic Repeat Request (HARQ) indication to the terminal through a Physical Hybrid ARQ Indicator Channel (PHICH) to indicate that the uplink data transmitted by the terminal is received, for example, the base station transmits the HARQ indication to the terminal through the PHICH at an ith time, where the HARQ indication is used to indicate whether the uplink data received by the base station at the ith-4 time and transmitted by the terminal through the PUSCH is correctly received. In an FDD system, each subframe of a downlink Frequency band reserves time-Frequency resources for a PHICH, and the PHICH occupies a control region portion of the time-Frequency resources of one subframe, for example, the PHICH may occupy the first N Orthogonal Frequency Division Multiplexing (OFDM) symbols in one subframe in the time domain.
At present, a flexible duplex technique is applied in an FDD system, please refer to fig. 1(a) and fig. 1(b), which are schematic diagrams of frequency band usage of the flexible duplex technique in the prior art, as shown in fig. 1(a), data of a downlink frequency band is allowed to be transmitted in a part of subframes of an uplink frequency band to improve channel capacity of a mobile communication system, and as shown in fig. 1(b), in order to avoid interference from uplink and downlink data transmission of the uplink frequency band, a part of subframes of the uplink frequency band are idle; in summary, part of subframes in the uplink frequency band are used for transmitting downlink data or are idle, so the number of subframes for transmitting uplink data in the uplink frequency band is reduced, which results in reduction of HARQ indications sent by the base station to the terminal, and thus, PHICH resources on part of subframes in the downlink frequency band do not need to transmit HARQ indications, thereby causing waste of PHICH resources.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, a system, a base station, and a terminal for transmitting downlink control information, which can improve the utilization rate of PHICH resources.
In a first aspect, an embodiment of the present invention provides a base station, including:
a processing unit, configured to determine a first resource, where the first resource includes at least one physical hybrid automatic repeat request indicator PHICH resource, and the first resource is used to transmit at least one downlink control information DCI;
a sending unit, configured to send the at least one DCI to a terminal by using the first resource, where the at least one DCI is used to instruct the terminal to receive downlink data or send uplink data.
In a first possible implementation manner of the first aspect, the sending unit is specifically configured to:
determining at least one Control Channel Element (CCE) according to the attribute information of the first resource;
and transmitting the at least one DCI to the terminal by utilizing the at least one CCE.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the attribute information of the first resource includes information of the number of REGs and grouping information of REGs in the first resource, in the resource group of the PHICH; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the sending the at least one DCI to the terminal by using the at least one CCE specifically includes:
utilizing 2 of the at least one CCEmAnd transmitting the at least one DCI to the terminal by the CCEs, wherein m is equal to 0, 1, 2 or 3.
With reference to the first aspect, the first possible implementation manner of the first aspect, or the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the at least one DCI is used to instruct the terminal to receive downlink data in an uplink frequency band; or,
the at least one DCI is used for indicating the terminal to send uplink data in an uplink frequency band; or,
the at least one DCI is used for instructing the terminal to receive downlink data in a downlink frequency band.
In a second aspect, an embodiment of the present invention further provides a terminal, including:
a receiving unit, configured to receive at least one downlink control information DCI sent by a base station in a first resource; wherein the first resource comprises at least one physical hybrid automatic repeat indicator (PHICH) resource;
and the processing unit is used for receiving downlink data or sending uplink data according to the at least one DCI.
In a first possible implementation manner of the second aspect, the receiving unit specifically includes:
and the acquisition module is used for acquiring the time-frequency position of the first resource.
With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the obtaining module is further configured to:
acquiring attribute information of a first resource;
and determining at least one Control Channel Element (CCE) according to the attribute information of the first resource, wherein the at least one CCE is a time-frequency resource corresponding to the received at least one DCI.
With reference to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the attribute information of the first resource includes information of the number of resource groups REG and grouping information of REGs of the PHICH in the first resource; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the receiving unit further includes:
and a blind detection module, configured to perform blind detection in the first resource according to the quantity information of the REGs and the grouping information of the REGs to obtain the at least one DCI.
With reference to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the blind detection module is specifically configured to:
obtaining a first proprietary search space and a second proprietary search space;
performing blind detection in the first resource using the first dedicated search space to obtain a first portion of DCI;
performing blind detection in PDCCH resources by using the second dedicated search space to obtain a second part of DCI;
the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource are not equal to 0, and the sum of the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource is less than or equal to a preset threshold.
With reference to the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, the first part of DCI is used to instruct the terminal to receive downlink data in an uplink frequency band.
With reference to the fifth possible implementation manner of the second aspect, in a seventh possible implementation manner of the second aspect, the second part of DCI is used to instruct the terminal to transmit uplink data in an uplink frequency band and/or the second part of DCI is used to instruct the terminal to receive downlink data in a downlink frequency band.
With reference to the fourth possible implementation manner of the second aspect, in an eighth possible implementation manner of the second aspect, the blind detection module is specifically configured to:
obtaining a third proprietary search space;
performing blind detection in the first resource using the third dedicated search space to obtain a third portion of DCI;
the blind detection times in the first resource are more than 0 and less than or equal to a preset threshold value.
With reference to the eighth possible implementation manner of the second aspect, in a ninth possible implementation manner of the second aspect, the blind detection number of times in the first resource is greater than 0 and smaller than the preset threshold, and the blind detection module is further configured to:
obtaining a fourth proprietary search space;
blind detection is carried out in PDCCH resources by utilizing the fourth proprietary search space to obtain a fourth part DCI;
and the sum of the times of blind detection in the first resource and the times of blind detection in the PDCCH resource is less than or equal to the preset threshold.
With reference to the second aspect, or the first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth possible implementation manners of the second aspect, in a tenth possible implementation manner of the second aspect, the at least one DCI is used to instruct the terminal to receive downlink data in an uplink frequency band; or,
the at least one DCI is used for indicating the terminal to send uplink data in an uplink frequency band; or,
the at least one DCI is used for instructing the terminal to receive downlink data in a downlink frequency band.
In a third aspect, an embodiment of the present invention further provides a system for transmitting downlink control information, including a base station and a terminal;
the base station is used for determining a first resource, and the first resource comprises at least one physical hybrid automatic repeat request indicator (PHICH) resource; and transmitting the at least one DCI to the terminal using the first resource;
the terminal is configured to receive the at least one DCI in the first resource, and receive downlink data or send uplink data according to the at least one DCI.
In a fourth aspect, an embodiment of the present invention provides a method for transmitting downlink control information, including:
determining a first resource, wherein the first resource comprises at least one physical hybrid automatic repeat indicator (PHICH) resource, and is used for transmitting at least one Downlink Control Information (DCI);
and transmitting the at least one DCI to a terminal by using the first resource, wherein the at least one DCI is used for indicating the terminal to receive downlink data or transmit uplink data.
In a first possible implementation manner of the fourth aspect, the transmitting the at least one DCI to the terminal using the first resource includes:
determining at least one Control Channel Element (CCE) according to the attribute information of the first resource;
and transmitting the at least one DCI to the terminal by utilizing the at least one CCE.
With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the attribute information of the first resource includes information of the number of resource groups REG and grouping information of REGs of the PHICH in the first resource; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
With reference to the first possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the transmitting the at least one DCI to the terminal by using the at least one CCE includes:
utilizing 2 of the at least one CCEmAnd transmitting the at least one DCI to the terminal by the CCEs, wherein m is equal to 0, 1, 2 or 3.
With reference to the fourth aspect, the first possible implementation manner of the fourth aspect, or the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the at least one DCI is used to instruct the terminal to receive downlink data in an uplink frequency band; or,
the at least one DCI is used for indicating the terminal to send uplink data in an uplink frequency band; or,
the at least one DCI is used for instructing the terminal to receive downlink data in a downlink frequency band.
In a fifth aspect, an embodiment of the present invention further provides a method for transmitting downlink control information, where the method includes:
receiving at least one downlink control information DCI sent by a base station at a first resource; wherein the first resource comprises at least one physical hybrid automatic repeat indicator (PHICH) resource;
and receiving downlink data or sending uplink data according to the at least one DCI.
In a first possible implementation manner of the fifth aspect, before the first resource receives at least one downlink control information DCI sent by the base station, the method further includes:
and acquiring the time-frequency position of the first resource.
With reference to the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the method further includes:
acquiring attribute information of a first resource;
and determining at least one Control Channel Element (CCE) according to the attribute information of the first resource, wherein the at least one CCE is a time-frequency resource corresponding to the received at least one DCI.
With reference to the second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, the attribute information of the first resource includes information of the number of resource groups REG and grouping information of REGs of the PHICH in the first resource; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
With reference to the third possible implementation manner of the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the method further includes:
and performing blind detection in the first resource according to the quantity information of the REGs and the grouping information of the REGs to obtain the at least one DCI.
With reference to the fourth possible implementation manner of the fifth aspect, in a fifth possible implementation manner of the fifth aspect, the performing blind detection in the first resource to obtain the at least one DCI includes:
obtaining a first proprietary search space and a second proprietary search space;
performing blind detection in the first resource using the first dedicated search space to obtain a first portion of DCI;
performing blind detection in PDCCH resources by using the second dedicated search space to obtain a second part of DCI;
the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource are not equal to 0, and the sum of the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource is less than or equal to a preset threshold.
With reference to the fifth possible implementation manner of the fifth aspect, in a sixth possible implementation manner of the fifth aspect, the first part of DCI is used to instruct the terminal to receive downlink data in an uplink frequency band.
With reference to the fifth possible implementation manner of the fifth aspect, in a seventh possible implementation manner of the fifth aspect, the second part of DCI is used to instruct the terminal to transmit uplink data in an uplink frequency band and/or the second part of DCI is used to instruct the terminal to receive downlink data in a downlink frequency band.
With reference to the fourth possible implementation manner of the fifth aspect, in an eighth possible implementation manner of the fifth aspect, the performing blind detection in the first resource to obtain the at least one DCI includes:
obtaining a third proprietary search space;
performing blind detection in the first resource using the third dedicated search space to obtain a third portion of DCI;
the blind detection times in the first resource are more than 0 and less than or equal to a preset threshold value.
With reference to the eighth possible implementation manner of the fifth aspect, in a ninth possible implementation manner of the fifth aspect, the blind detection times in the first resource are greater than 0 and smaller than the preset threshold, and the method further includes:
obtaining a fourth proprietary search space;
blind detection is carried out in PDCCH resources by utilizing the fourth proprietary search space to obtain a fourth part DCI;
and the sum of the times of blind detection in the first resource and the times of blind detection in the PDCCH resource is less than or equal to the preset threshold.
With reference to the fifth aspect, or the first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth possible implementation manners of the fifth aspect, in a tenth possible implementation manner of the fifth aspect, the at least one DCI is used to instruct the terminal to receive downlink data in an uplink frequency band; or,
the at least one DCI is used for indicating the terminal to send uplink data in an uplink frequency band; or,
the at least one DCI is used for instructing the terminal to receive downlink data in a downlink frequency band.
In the technical scheme provided by the embodiment of the invention, the base station transmits DCI to the terminal by using the PHICH resource in an idle state, thereby effectively utilizing the PHICH resource, improving the utilization rate of the PHICH resource and reducing the waste of the PHICH resource.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIGS. 1(a) and 1(b) are schematic diagrams of frequency band usage of the FLD technology in the prior art;
FIG. 2 is a block diagram of a base station according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating frequency band usage of the FLD technology according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 5 is a functional block diagram of a terminal according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 7 is a functional block diagram of a system for transmitting downlink control information according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a first method for transmitting downlink control information according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating a second method for transmitting downlink control information according to an embodiment of the present invention.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used to describe various information in embodiments of the present invention, the information should not be limited to these terms. These terms are only used to distinguish one information item from another. For example, a first dedicated search space may also be referred to as a second dedicated search space, and similarly, a second dedicated search space may also be referred to as a first dedicated search space, without departing from the scope of embodiments of the present invention.
The word "if," as used herein, may be interpreted as "when or" in response to determining "or" in response to detecting, "depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
In the communication technology, a frequency band used by the base station to transmit data to the terminal is referred to as a downlink frequency band, data transmitted by the base station to the terminal is referred to as downlink data, and the terminal can receive the downlink data transmitted by the base station. The frequency band used by the terminal to transmit data to the base station is called an uplink frequency band, the data transmitted by the terminal to the base station is called uplink data, and the base station can receive the uplink data transmitted by the terminal.
Referring to fig. 2, a functional block diagram of a base station according to an embodiment of the present invention is provided. As shown, the base station includes:
a processing unit 201, configured to determine a first resource, where the first resource includes at least one physical hybrid automatic repeat request indicator PHICH resource, and is used to transmit at least one downlink control information DCI;
a sending unit 202, configured to send the at least one DCI to a terminal by using the first resource, where the at least one DCI is used to instruct the terminal to receive downlink data or send uplink data.
Preferably, the sending unit 202 is specifically configured to:
determining at least one Control Channel Element (CCE) according to the attribute information of the first resource;
and transmitting the at least one DCI to the terminal by utilizing the at least one CCE.
Preferably, the attribute information of the first resource includes the number information of resource groups REG and the grouping information of REGs of the PHICH in the first resource; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
Preferably, the sending the at least one DCI to the terminal by using the at least one CCE specifically includes: utilizing 2 of the at least one CCEmAnd transmitting the at least one DCI to the terminal by the CCEs, wherein m is equal to 0, 1, 2 or 3.
Preferably, the at least one DCI is used to instruct the terminal to receive downlink data in an uplink frequency band; or, the at least one DCI is used to instruct the terminal to transmit uplink data in an uplink frequency band; or, the at least one DCI is used to instruct the terminal to receive downlink data in a downlink frequency band.
Preferably, the processing unit 201 may obtain a subframe of a downlink frequency band according to the relevant configuration information of the flexible duplex technology, where the PHICH resource in the subframe of the downlink frequency band does not transmit the HARQ indication. For example, the configuration information related to the flexible duplex technology is subframes in an uplink frequency band that can transmit downlink data, the processing unit 201 may know that downlink data is transmitted on the subframes in the uplink frequency band, and a PHICH resource in a subframe in a downlink frequency band corresponding to a subframe in the uplink frequency band will not transmit an HARQ indication, the processing unit 201 may use the subframes in the downlink frequency band as the subframes in the downlink frequency band, that is, the PHICH resource includes a PHICH resource that transmits an HARQ indication and a PHICH resource that does not transmit an HARQ indication, and the processing unit 201 may use the PHICH resource that does not transmit an HARQ indication as a first resource to transmit at least one piece of DCI. In the embodiment of the invention, the PHICH resource in the idle state is used for transmitting DCI, thereby reducing the waste of the PHICH resource and improving the utilization rate of the PHICH resource.
For example, please refer to fig. 3, which is a schematic diagram illustrating a frequency band usage of the flexible duplex technology according to an embodiment of the present invention, as shown in the figure, a subframe 0, a subframe 1, a subframe 5, and a subframe 6 in an uplink frequency band are used for transmitting downlink data D, and the remaining subframes are used for transmitting uplink data U; correspondingly, subframe 4, subframe 5, subframe 9, and subframe 0 in the downlink frequency band correspond to subframe 0, subframe 1, subframe 5, and subframe 6 in the uplink frequency band, respectively, and subframe 0, subframe 4, subframe 5, and subframe 9 in the downlink frequency band do not transmit HARQ indications, so that the base station may transmit at least one DCI to the terminal using PHICH resources in subframe 0, subframe 4, subframe 5, and subframe 9 in the downlink frequency band as the first resource.
Preferably, after the sending unit 202 obtains the first resource, the sending unit 202 may send at least one DCI to the terminal by using the first resource, so that the terminal performs data transmission according to the at least one DCI.
For example, the transmitting unit 202 may transmit at least one DCI to the terminal using the first resource, including:
firstly, according to the number of the PHICH resources, the number of PHICH groups is obtained by using the following formula:
wherein,indicating the number of PHICH groups; n is a radical ofgIndicates the number of PHICH resources, Ng∈{1/6，1/2，1，2}；Indicates the number of physical resource blocks of the downlink frequency band.
Then, according to the number of OFDM symbols occupied by PHICH resources in the subframe of the downlink frequency band, the quantity information of REG and the grouping information of REG are obtained; or, the number information of REGs and the grouping information of REGs set in advance are obtained. The grouping information of the REGs refers to which REGs among the REGs constituting the PHICH resource can be used to constitute a CCE for transmitting DCI.
Finally, according to the number of PHICH groupsAnd grouping information of REGs, obtaining at least one CCE, and utilizing 2 in the at least one CCEmAnd transmitting the DCI to the terminal by the CCE. m is equal to 0, 1, 2 or 3.
For example, REGs that can be used to compose a CCE may be obtained according to the grouping information of REGs in which 3 REGs are composed into one CCE according to a preset rule, e.g., will satisfymod3 ═ 0, 1, 2 REGs make up one CCE, where,is greater than or equal to 0 and less than or equal toSimilarly, if 2 CCEs need to be obtained, 6 REGs need to be utilized, and if 4 CCEs need to be obtained, 12 REGs need to be utilized.
Preferably, the base station may send the obtained CCE composition information to the terminal through signaling, may also notify the terminal in another manner, and may also preset the CCE composition information in the terminal.
For example, table 1 shows that the bandwidth of the 20M downlink frequency band is taken as an example, and the number of CCEs that the base station can support includes 1, 2, 4, and 8 according to the number of different PHICH resources, that is, all PDCCH aggregation levels can be supported.
TABLE 1
As shown in table 1, when the number of CCEs is 1, the supportable aggregation level is 1, the number of DCIs that can be transmitted is 1, and it indicates that 1 CCE can transmit 1 DCI when 1 DCI is transmitted by 1 CCE; when the number of CCEs is 2, the supported aggregation level is 1, and the number of DCI that can be transmitted is 2, which means that 2 CCEs can transmit 2 pieces of DCI in the case of transmitting 1 piece of DCI with 1 CCE; when the number of CCEs is 2, the supported aggregation level is 2, and the number of DCI that can be transmitted is 1, which means that 1 DCI can be transmitted by 2 CCEs when 1 DCI is transmitted by 2 CCEs; when the number of CCEs is 4, the supported aggregation level is 1, and the number of DCI that can be transmitted is 4, which means that 4 CCEs can transmit 4 pieces of DCI in the case of transmitting 1 piece of DCI with 1 CCE; when the number of CCEs is 4, the aggregation level that can be supported is 2, and the number of DCI that can be transmitted is 2, which means that in the case of transmitting 1 DCI with 2 CCEs, 2 DCIs can be transmitted by 4 CCEs, and so on.
Preferably, when the base station uses at least one PHICH resource to transmit at least one DCI to the terminal, if the used PHICH resource is only used to transmit DCI instructing the terminal to receive downlink data in an uplink frequency band, the DCI transmitted to the terminal does not need to be increased in DCI format, and the DCI is only used to instruct the terminal to receive downlink data in the uplink frequency band; or, the base station uses the existing DCI for instructing the terminal to receive the downlink data, where the DCI is not only used for instructing the terminal to receive the downlink data in the uplink frequency band. If the utilized PHICH resource is not only used for transmitting DCI instructing the terminal to receive downlink data in the uplink frequency band, the DCI format transmitted to the terminal needs to be increased, and the increased DCI format is used for instructing the terminal to receive downlink data in the uplink frequency band. Or, adding indication information in the existing DCI format, where the indication information is used to indicate the terminal to receive downlink data in an uplink frequency band.
Please refer to fig. 4, which is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown, the base station includes:
a memory 401 for storing information including program routines;
a processor 402, coupled to the memory 401 and the transmitter 403 respectively, for controlling the execution of the program routine, specifically including: determining a first resource, wherein the first resource comprises at least one physical hybrid automatic repeat indicator (PHICH) resource, and is used for transmitting at least one Downlink Control Information (DCI);
a transmitter 403, configured to transmit the at least one DCI to a terminal using the first resource, where the at least one DCI is used to instruct the terminal to receive downlink data or transmit uplink data.
An embodiment of the present invention further provides a terminal, please refer to fig. 5, which is a functional block diagram of the terminal provided in the embodiment of the present invention, as shown in the figure, the terminal includes:
a receiving unit 501, configured to receive at least one downlink control information DCI sent by a base station in a first resource; wherein the first resource comprises at least one physical hybrid automatic repeat indicator (PHICH) resource;
a processing unit 502, configured to receive downlink data or send uplink data according to the at least one DCI.
Optionally, the receiving unit 501 further includes:
an obtaining module 5011, configured to obtain a time-frequency location of the first resource.
Optionally, the obtaining module 5011 is further configured to:
acquiring attribute information of a first resource;
and determining at least one Control Channel Element (CCE) according to the attribute information of the first resource, wherein the at least one CCE is a time-frequency resource corresponding to the received at least one DCI.
Preferably, the attribute information of the first resource includes the number information of resource groups REG and the grouping information of REGs of the PHICH in the first resource; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
Specifically, the receiving unit 501 of the terminal may receive broadcast information through PBCH, and may obtain the number information of REGs of the PHICH resource and the grouping information of REGs according to the broadcast information.
The receiving unit 501 may know which REGs in the group information of the REGs constitute the CCE according to the composition information of the CCE, which is sent by the base station through signaling, or notified by other methods, or preset, so that the receiving unit 501 may perform blind detection on the determined CCE to obtain the DCI.
Optionally, the acquisition module 5011 may further include a blind detection module 5012.
A blind detection module 5012, configured to perform blind detection in the first resource according to the number information of the REGs and the grouping information of the REGs to obtain the at least one DCI.
Here, the terminal needs to determine DCI corresponding to itself, and since there is a possibility that DCI of other terminals exists in the PHICH resource, the terminal needs to search the PHICH resource.
For example, the blind detection module 5012 performs blind detection in the first resource according to the number information of the REGs and the grouping information of the REGs, so as to obtain the at least one DCI specifically includes two types:
the first method comprises the following steps: obtaining a first proprietary search space and a second proprietary search space; performing blind detection in the first resource using the first dedicated search space to obtain a first portion of DCI; performing blind detection in PDCCH resources by using the second dedicated search space to obtain a second part of DCI; the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource are not equal to 0, and the sum of the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource is less than or equal to a preset threshold.
And performing blind detection in the first resource by using the first dedicated search space, wherein the obtained first part of DCI is used for indicating the terminal to receive downlink data in an uplink frequency band.
And performing blind detection in the PDCCH resources by using the second dedicated search space, wherein the obtained second part of DCI is used for indicating the terminal to send uplink data in an uplink frequency band, and/or the second part of DCI is used for indicating the terminal to receive downlink data in a downlink frequency band.
It is understood that the first and second dedicated search spaces may be preset or indicated by the base station.
It should be noted that the second dedicated search space is equivalent to an original dedicated search space in the prior art, and the dedicated search space is used for blind detection in PDCCH resources; the first dedicated search space corresponds to a newly added dedicated search space that is only used for blind detection in the first resource and is not used for blind detection in the PDCCH resource. In addition, one blind detection time needs to be used, in order to not increase the blind detection time, in the above technical solution, a part of the blind detection time corresponding to the original dedicated search space needs to be allocated to the newly added dedicated search space, and after allocation, the sum of the blind detection time corresponding to the newly added dedicated search space and the blind detection time corresponding to the original dedicated search space cannot exceed the preset blind detection time threshold. For example, the blind detection number threshold may be 16. In addition, the blind detection times corresponding to the newly added dedicated search space and the blind detection times corresponding to the original dedicated search space are not equal to 0.
And the second method comprises the following steps: obtaining a third proprietary search space; performing blind detection in the first resource using the third dedicated search space to obtain a third portion of DCI; the blind detection times in the first resource are more than 0 and less than or equal to a preset threshold value.
When the blind detection times in the first resource are more than 0 and less than the preset threshold, a fourth proprietary search space can be obtained; blind detection is carried out in PDCCH resources by utilizing the fourth proprietary search space to obtain a fourth part DCI; and the sum of the times of blind detection in the first resource and the times of blind detection in the PDCCH resource is less than or equal to the preset threshold. In this case, neither the number of times of blind detection in the first resource nor the number of times of blind detection in the PDCCH resource is equal to 0.
Wherein the third dedicated search space corresponds to the first dedicated search space, and the fourth dedicated search space corresponds to the second dedicated search space.
It can be understood that, if the number of blind detections performed in the first resource has reached the preset blind detection threshold, the fourth dedicated search space may not be reserved.
It should be noted that the fourth dedicated search space is equivalent to an original dedicated search space in the prior art, and the dedicated search space is used for blind detection in PDCCH resources; the third dedicated search space is equivalent to a newly added dedicated search space, the newly added dedicated search space is only used for blind detection in the first resource, and in addition, in order not to increase the number of blind detection times, in the above technical solution, it is necessary to preferentially allocate the number of blind detection times to the newly added dedicated search space, that is, to perform blind detection in the first resource by using the third dedicated search space; then, if the number of blind detections performed in the first resource has reached a preset blind detection threshold, the fourth dedicated search space is not reserved, that is, the number of blind detections performed in the PDCCH resource may be equal to 0.
Preferably, the at least one DCI is used to instruct the terminal to receive downlink data in an uplink frequency band; or, the at least one DCI is used to instruct the terminal to transmit uplink data in an uplink frequency band; or, the at least one DCI is used to instruct the terminal to receive downlink data in a downlink frequency band.
For example, taking 20M bandwidth as an example, depending on the number of PHICH resources, a dedicated search is performedThe allocation of cable space can be as shown in tables 1 to 4, wherein Table 1 is the number N of PHICH resourcesgTable 2 shows the number N of PHICH resources, which is the allocation of the dedicated search space at 1/6gTable 3 shows the number N of PHICH resources, which is the allocation of the dedicated search space at 1/2gTable 4 shows the number N of PHICH resources as the allocation of the dedicated search space when 1gThe allocation of the exclusive search space when 2.
TABLE 1
TABLE 3
TABLE 4
Please refer to fig. 6, which is a schematic structural diagram of a terminal according to an embodiment of the present invention. As shown, the terminal includes:
a receiver 601, configured to receive at least one downlink control information DCI sent by a base station in a first resource; wherein the first resource comprises at least one physical hybrid automatic repeat indicator (PHICH) resource;
a memory 602 for storing information including program routines;
the processor 603, coupled to the memory 602 and the receiver 601 respectively, is configured to control execution of the program routine, and specifically includes: and receiving downlink data or sending uplink data according to the at least one DCI.
Fig. 7 is a functional block diagram of a system for transmitting downlink control information according to an embodiment of the present invention, and as shown in the figure, the system includes a base station 701 and a terminal 702; wherein,
the base station 701 is configured to determine a first resource, where the first resource includes at least one physical hybrid automatic repeat request indicator PHICH resource; and transmitting the at least one DCI to the terminal using the first resource;
the terminal 702 is configured to receive the at least one DCI in the first resource, and receive downlink data or send uplink data according to the at least one DCI.
The embodiment of the invention further provides a method embodiment for realizing each unit in the device embodiment.
The embodiment of the invention provides a transmission method of downlink control information, which is realized by a base station side. Please refer to fig. 8, which is a flowchart illustrating a first method for transmitting downlink control information according to an embodiment of the present invention; as shown in fig. 8, the method comprises the steps of:
step 801, a base station determines a first resource, where the first resource includes at least one physical hybrid automatic repeat request indicator PHICH resource, and the first resource is used to transmit at least one downlink control information DCI.
Step 802, the base station sends the at least one DCI to the terminal by using the first resource, where the at least one DCI is used to instruct the terminal to receive downlink data or send uplink data.
Specifically, the base station may determine at least one control channel element CCE according to the attribute information of the first resource; the at least one DCI is then transmitted to the terminal using the at least one CCE.
Wherein the attribute information of the first resource includes the number information of resource groups REG and the grouping information of REGs of PHICH in the first resource.
Wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
For example, the method for the base station to transmit the at least one DCI to the terminal by using the at least one CCE may include: the base station utilizes 2 of the at least one CCEmAnd transmitting the at least one DCI to the terminal by the CCEs, wherein m is equal to 0, 1, 2 or 3.
Wherein the at least one DCI is used for instructing the terminal to receive downlink data in an uplink frequency band; or, the at least one DCI is used to instruct the terminal to transmit uplink data in an uplink frequency band; or, the at least one DCI is used to instruct the terminal to receive downlink data in a downlink frequency band.
The embodiment of the invention also provides a transmission method of the downlink control information, which is realized at the terminal side. Please refer to fig. 9, which is a flowchart illustrating a second method for transmitting downlink control information according to an embodiment of the present invention; as shown in fig. 9, the method includes the steps of:
step 901, the terminal receives at least one downlink control information DCI sent by the base station at a first resource; wherein the first resource comprises at least one physical hybrid automatic repeat indicator (PHICH) resource.
Step 902, the terminal receives downlink data or transmits uplink data according to the at least one DCI.
Optionally, before step 901, the method further includes:
and the terminal acquires the time-frequency position of the first resource.
Optionally, the method further includes:
the terminal acquires attribute information of the first resource;
and the terminal determines at least one Control Channel Element (CCE) according to the attribute information of the first resource, wherein the at least one CCE is a time-frequency resource corresponding to the received at least one DCI.
Wherein the attribute information of the first resource comprises the number information of resource groups REG and the grouping information of REGs of PHICH in the first resource; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
Optionally, the method further includes:
and the terminal performs blind detection in the first resource according to the quantity information of the REGs and the grouping information of the REGs to obtain the at least one DCI.
Specifically, the blind detection performed by the terminal in the first resource to obtain the at least one DCI may include the following two implementation methods:
the first method comprises the following steps: obtaining a first proprietary search space and a second proprietary search space; performing blind detection in the first resource using the first dedicated search space to obtain a first portion of DCI; performing blind detection in PDCCH resources by using the second dedicated search space to obtain a second part of DCI; the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource are not equal to 0, and the sum of the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource is less than or equal to a preset threshold.
Wherein the first part of DCI is used for instructing the terminal to receive downlink data in an uplink frequency band.
The second part of DCI is used for instructing the terminal to transmit uplink data in an uplink frequency band and/or the second part of DCI is used for instructing the terminal to receive downlink data in a downlink frequency band.
And the second method comprises the following steps: obtaining a third proprietary search space; performing blind detection in the first resource using the third dedicated search space to obtain a third portion of DCI; the blind detection times in the first resource are more than 0 and less than or equal to a preset threshold value.
When the blind detection times in the first resource are greater than 0 and less than the preset threshold, the second method further includes: obtaining a fourth proprietary search space; blind detection is carried out in PDCCH resources by utilizing the fourth proprietary search space to obtain a fourth part DCI; and the sum of the times of blind detection in the first resource and the times of blind detection in the PDCCH resource is less than or equal to the preset threshold.
In the above method, the at least one DCI is used to instruct the terminal to receive downlink data in an uplink frequency band; or, the at least one DCI is used to instruct the terminal to transmit uplink data in an uplink frequency band; or, the at least one DCI is used to instruct the terminal to receive downlink data in a downlink frequency band.
In the technical scheme provided by the embodiment of the invention, if the first resource is not used for transmitting the HARQ indication, the base station transmits the DCI to the terminal by using the first resource, so that the PHICH resource in an idle state can be effectively utilized, the utilization rate of the PHICH resource is improved, and the waste of the PHICH resource is reduced. In addition, since the PHICH resource is used to transmit DCI, the capacity of the PDCCH is increased.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (33)

1. A base station, characterized in that the base station comprises:
a processing unit, configured to determine a first resource, where the first resource is at least one physical hybrid automatic repeat request indicator PHICH resource, and the first resource is used to transmit at least one downlink control information DCI;
a sending unit, configured to send the at least one DCI to a terminal by using the first resource, where the at least one DCI is used to instruct the terminal to receive downlink data or send uplink data.
2. The base station of claim 1, wherein the sending unit is specifically configured to:
determining at least one Control Channel Element (CCE) according to the attribute information of the first resource;
and transmitting the at least one DCI to the terminal by utilizing the at least one CCE.
3. The base station of claim 2, wherein the attribute information of the first resource comprises information on the number of resource groups REGs and grouping information of REGs of a PHICH in the first resource; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
4. The base station of claim 2, wherein the transmitting the at least one DCI to the terminal using the at least one CCE comprises:
utilizing 2 of the at least one CCEmAnd transmitting the at least one DCI to the terminal by the CCEs, wherein m is equal to 0, 1, 2 or 3.
5. The base station of claim 1, 2 or 4,
the at least one DCI is used for indicating the terminal to receive downlink data in an uplink frequency band; or,
the at least one DCI is used for indicating the terminal to send uplink data in an uplink frequency band; or,
the at least one DCI is used for instructing the terminal to receive downlink data in a downlink frequency band.
6. A terminal, characterized in that the terminal comprises:
a receiving unit, configured to receive at least one downlink control information DCI sent by a base station in a first resource; wherein the first resource is at least one physical hybrid automatic repeat indicator (PHICH) resource;
and the processing unit is used for receiving downlink data or sending uplink data according to the at least one DCI.
7. The terminal according to claim 6, wherein the receiving unit specifically includes:
and the acquisition module is used for acquiring the time-frequency position of the first resource.
8. The terminal of claim 7, wherein the obtaining module is further configured to:
acquiring attribute information of a first resource;
and determining at least one Control Channel Element (CCE) according to the attribute information of the first resource, wherein the at least one CCE is a time-frequency resource corresponding to the received at least one DCI.
9. The terminal of claim 8, wherein the attribute information of the first resource comprises information on the number of resource groups REGs and grouping information of REGs of a PHICH in the first resource; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
10. The terminal of claim 9, wherein the receiving unit further comprises:
and a blind detection module, configured to perform blind detection in the first resource according to the quantity information of the REGs and the grouping information of the REGs to obtain the at least one DCI.
11. The terminal of claim 10, wherein the blind detection module is specifically configured to:
obtaining a first proprietary search space and a second proprietary search space;
performing blind detection in the first resource using the first dedicated search space to obtain a first portion of DCI;
performing blind detection in PDCCH resources by using the second dedicated search space to obtain a second part of DCI;
the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource are not equal to 0, and the sum of the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource is less than or equal to a preset threshold.
12. The terminal of claim 11, wherein the first portion of DCI is used to instruct the terminal to receive downlink data in an uplink frequency band.
13. The terminal of claim 11, wherein the second DCI part is used to instruct the terminal to transmit uplink data in an uplink frequency band and/or the second DCI part is used to instruct the terminal to receive downlink data in a downlink frequency band.
14. The terminal of claim 10, wherein the blind detection module is specifically configured to:
obtaining a third proprietary search space;
performing blind detection in the first resource using the third dedicated search space to obtain a third portion of DCI;
the blind detection times in the first resource are more than 0 and less than or equal to a preset threshold value.
15. The terminal of claim 14, wherein the number of blind detections in the first resource is greater than 0 and less than the preset threshold, and wherein the blind detection module is further configured to:
obtaining a fourth proprietary search space;
blind detection is carried out in PDCCH resources by utilizing the fourth proprietary search space to obtain a fourth part DCI;
and the sum of the times of blind detection in the first resource and the times of blind detection in the PDCCH resource is less than or equal to the preset threshold.
16. The terminal according to any of the claims 6 to 15,
the at least one DCI is used for indicating the terminal to receive downlink data in an uplink frequency band; or,
the at least one DCI is used for indicating the terminal to send uplink data in an uplink frequency band; or,
the at least one DCI is used for instructing the terminal to receive downlink data in a downlink frequency band.
17. A transmission system of downlink control information is characterized in that the system comprises a base station and a terminal;
the base station is used for determining a first resource, wherein the first resource is at least one physical hybrid automatic repeat request indicator (PHICH) resource; and transmitting the at least one DCI to the terminal using the first resource;
the terminal is configured to receive the at least one DCI in the first resource, and receive downlink data or send uplink data according to the at least one DCI.
18. A method for transmitting downlink control information, the method comprising:
determining a first resource, wherein the first resource is at least one physical hybrid automatic repeat indicator (PHICH) resource, and is used for transmitting at least one Downlink Control Information (DCI);
and transmitting the at least one DCI to a terminal by using the first resource, wherein the at least one DCI is used for indicating the terminal to receive downlink data or transmit uplink data.
19. The method of claim 18, wherein the transmitting the at least one DCI to a terminal using the first resource comprises:
determining at least one Control Channel Element (CCE) according to the attribute information of the first resource;
and transmitting the at least one DCI to the terminal by utilizing the at least one CCE.
20. The method of claim 19, wherein the attribute information of the first resource comprises number information of resource groups REG and grouping information of REGs of PHICH in the first resource; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
21. The method of claim 19, wherein the transmitting the at least one DCI to the terminal using the at least one CCE comprises:
utilizing 2 of the at least one CCEmAnd transmitting the at least one DCI to the terminal by the CCEs, wherein m is equal to 0, 1, 2 or 3.
22. The method of claim 18, 19 or 21,
the at least one DCI is used for indicating the terminal to receive downlink data in an uplink frequency band; or,
the at least one DCI is used for indicating the terminal to send uplink data in an uplink frequency band; or,
the at least one DCI is used for instructing the terminal to receive downlink data in a downlink frequency band.
23. A method for transmitting downlink control information, the method comprising:
receiving at least one downlink control information DCI sent by a base station at a first resource; wherein the first resource is at least one physical hybrid automatic repeat indicator (PHICH) resource;
and receiving downlink data or sending uplink data according to the at least one DCI.
24. The method of claim 23, wherein before the first resource receives at least one downlink control information DCI transmitted by the base station, the method further comprises:
and acquiring the time-frequency position of the first resource.
25. The method of claim 24, further comprising:
acquiring attribute information of a first resource;
and determining at least one Control Channel Element (CCE) according to the attribute information of the first resource, wherein the at least one CCE is a time-frequency resource corresponding to the received at least one DCI.
26. The method of claim 25, wherein the attribute information of the first resource comprises number information of resource groups REG and grouping information of REGs of PHICH in the first resource; wherein the grouping information of the REGs is used to determine at least one REG corresponding to each of the CCEs.
27. The method of claim 26, further comprising:
and performing blind detection in the first resource according to the quantity information of the REGs and the grouping information of the REGs to obtain the at least one DCI.
28. The method of claim 27, wherein the blind detecting in the first resource to obtain the at least one DCI comprises:
obtaining a first proprietary search space and a second proprietary search space;
performing blind detection in the first resource using the first dedicated search space to obtain a first portion of DCI;
performing blind detection in PDCCH resources by using the second dedicated search space to obtain a second part of DCI;
the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource are not equal to 0, and the sum of the number of times of blind detection in the first resource and the number of times of blind detection in the PDCCH resource is less than or equal to a preset threshold.
29. The method of claim 28, wherein the first portion of DCI is used to instruct a terminal to receive downlink data in an uplink frequency band.
30. The method of claim 28, wherein the second portion of DCI is used to instruct a terminal to transmit uplink data in an uplink frequency band and/or the second portion of DCI is used to instruct the terminal to receive downlink data in a downlink frequency band.
31. The method of claim 27, wherein the blind detecting in the first resource to obtain the at least one DCI comprises:
obtaining a third proprietary search space;
performing blind detection in the first resource using the third dedicated search space to obtain a third portion of DCI;
the blind detection times in the first resource are more than 0 and less than or equal to a preset threshold value.
32. The method of claim 31, wherein the number of blind detections in the first resource is greater than 0 and less than the preset threshold, the method further comprising:
obtaining a fourth proprietary search space;
blind detection is carried out in PDCCH resources by utilizing the fourth proprietary search space to obtain a fourth part DCI;
and the sum of the times of blind detection in the first resource and the times of blind detection in the PDCCH resource is less than or equal to the preset threshold.
33. The method of any one of claims 23 to 32,
the at least one DCI is used for indicating the terminal to receive downlink data in an uplink frequency band; or,
the at least one DCI is used for indicating the terminal to send uplink data in an uplink frequency band; or,
the at least one DCI is used for instructing the terminal to receive downlink data in a downlink frequency band.
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