CN107666713B - sPDCCH transmission method and device in sTTI - Google Patents
sPDCCH transmission method and device in sTTI Download PDFInfo
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- CN107666713B CN107666713B CN201610602255.4A CN201610602255A CN107666713B CN 107666713 B CN107666713 B CN 107666713B CN 201610602255 A CN201610602255 A CN 201610602255A CN 107666713 B CN107666713 B CN 107666713B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
- H04L1/0038—Blind format detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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Abstract
The invention discloses a method and a device for transmitting sPDCCH (short message Transmission channel) in sTTI (received time period), and relates to the technical field of communication. Wherein the method comprises the following steps: the target terminal detects short PDCCH mode format indication information (sPFI) transmitted in a control symbol domain of the existing transmission time interval legacy TTI; the target terminal determines the position and the size of the frequency domain resource occupied by the short physical downlink control channel (sPDCCH) of the current subframe according to the detected sPFI; and the target terminal performs blind detection in a corresponding sPDCCH search space according to the position and the size of the frequency domain resource occupied by the sPDCCH to obtain the sPDCCH corresponding to the target terminal, wherein the sPDCCH search space comprises the sPDCCH of a plurality of different terminals. By the method and the device, the frequency domain resources of the sPDCCH are flexible and configurable, and the frequency domain resource utilization rate of the sTTI is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting an sPDCCH in an sTTI.
Background
The 3GPP (the 3rd Generation Partnership Project) has established that "reduced latency technique" is used, and low latency terminal traffic is transmitted in the sTTI (short transmission time interval). The length of the sTTI is variable, and is generally measured in units of symbols, and the sTTI and legacy TTI (legacy transmission time interval) are multiplexed using an FDM (frequency-division multiplexing) or puncturing scheme. The sTTI includes a short Physical Downlink Control Channel (sPDCCH) and a short Physical Downlink Shared Channel (sPDSCH), and the low-latency terminal needs to receive and decode the sPDCCH first and further complete the sPDSCH reception according to the detected Downlink Control information.
The number of symbols occupied by a Physical Downlink Control Channel (PDCCH) in LTE (Long Term Evolution) is indicated by CFI (Control Format Indicator) information carried by a Physical Control Format Indicator (PCFICH). At present, for the Channel design scheme of sTTI, a conclusion has been reached that sPCFICH (short Physical Control Format Indicator Channel) is not additionally designed in sTTI. Therefore, the transmission scheme of the sPDCCH needs to be redesigned.
Disclosure of Invention
The invention aims to provide a method and a device for transmitting sPDCCH (short message dedicated control channel) in sTTI. The transmission method solves the technical problems that: how to make the frequency domain resource of the sPDCCH flexible and allocable, thereby improving the utilization rate of the frequency domain resource in the sTTI.
In order to achieve the above object, the present invention provides a method for transmitting sPDCCH in sTTI. The method comprises the following steps:
the target terminal detects short PDCCH mode format indication information (sPFI) transmitted in a control symbol domain of the existing transmission time interval legacy TTI;
the target terminal determines the position and the size of the frequency domain resource occupied by the short physical downlink control channel (sPDCCH) of the current subframe according to the detected sPFI;
and the target terminal performs blind detection in a corresponding sPDCCH search space according to the position and the size of the frequency domain resource occupied by the sPDCCH to obtain the sPDCCH belonging to the target terminal, wherein the sPDCCH search space comprises the sPDCCH of a plurality of different terminals.
Optionally, the detecting, by the target terminal, short PDCCH mode format indication information sPFI transmitted in a control symbol field of an existing transmission time interval legacy TTI includes:
the target terminal detects the sPFI carried in the downlink control information DCI transmitted in the control symbol domain of the legacy TTI; or
And the target terminal detects the sPFI carried by the sPFICH in the short PDCCH mode format indication channel in the control symbol domain of the legacy TTI.
Optionally, the method further comprises:
and detecting downlink control information sDCI transmitted in the sPDCCH belonging to the target terminal, and receiving user data transmitted in the short physical downlink shared channel sPDSCH according to the sDCI.
Correspondingly, the invention also provides a terminal. The terminal includes:
the device comprises a first detection unit, a second detection unit and a control unit, wherein the first detection unit is used for detecting short PDCCH mode format indication information (sPFI) transmitted in a control symbol domain of the existing transmission time interval legacy TTI;
a determining unit, configured to determine, according to the detected sfi, a position and a size of a frequency domain resource occupied by a short physical downlink control channel, sPDCCH, of the current subframe;
and the blind detection unit is used for carrying out blind detection in a corresponding sPDCCH search space according to the position and the size of the frequency domain resource occupied by the sPDCCH to obtain the sPDCCH belonging to the target terminal, and the sPDCCH search space comprises the sPDCCH of a plurality of different terminals.
Optionally, the first detecting unit is specifically configured to:
detecting sPFI carried in downlink control information DCI transmitted in a control symbol domain of legacy TTI; or
Detecting the sPFI carried by the sPFICH indicated by the short PDCCH mode format indication channel in the control symbol domain of the legacy TTI.
Optionally, the terminal further includes:
and the second detection unit is used for detecting downlink control information sDCI transmitted in the sPDCCH belonging to the target terminal and receiving user data transmitted in the short physical downlink shared channel sPDSCH according to the sDCI.
Correspondingly, the invention also provides a transmission method of the sPDCCH in the sTTI. The method comprises the following steps:
loading the sPFI in a control symbol domain of a legacy TTI;
and transmitting the sPFI to the user terminal through the control symbol domain of the legacy TTI, so that the user terminal determines the sPFCH belonging to the target terminal according to the sPFI.
Optionally, the loading the sPFI in the control symbol domain of the legacy TTI includes:
adding X bits in DCI carried by a physical downlink control channel PDCCH, wherein X represents a constant and is used for carrying sPFI; or
And adding a short PDCCH mode format indication channel (sPFCH) in a control symbol domain of the legacy TTI, wherein the short PDCCH mode format indication channel is used for carrying sPFI.
Correspondingly, the invention also provides a base station. The base station includes:
the bearing unit is used for bearing the sPFI in a control symbol domain of the legacy TTI;
and the transmission unit is used for transmitting the sPFI to the user terminal through the control symbol domain of the legacy TTI, so that the user terminal determines the sPFCH belonging to the target terminal according to the sPFI.
Optionally, the carrying unit is specifically configured to:
adding X bits in DCI carried by a physical downlink control channel PDCCH, wherein X represents a constant and is used for carrying sPFI; or
And adding a short PDCCH mode format indication channel (sPFCH) in a control symbol domain of the legacy TTI, wherein the short PDCCH mode format indication channel is used for carrying sPFI.
Through the technical scheme, the user terminal detects short PDCCH mode format indication information (sPFI) transmitted in a control symbol domain of the existing transmission time interval legacy TTI; determining the position and the size of the frequency domain resource occupied by the short physical downlink control channel (sPDCCH) of the current subframe according to the detected sPFI; and performing blind detection in a corresponding sPDCCH search space according to the position and size of the frequency domain resource occupied by the sPDCCH to obtain the sPDCCH belonging to the target terminal, so that the frequency domain resource of the sPDCCH becomes flexible and configurable, and the utilization rate of the frequency domain resource in the sTTI is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from these without inventive effort.
Fig. 1 is a flowchart of a method for transmitting sPDCCH in sTTI according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an sPFI indication sPDCCH resource allocation provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for transmitting sPDCCH in sTTI according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Fig. 1 is a flowchart of a method for transmitting sPDCCH in sTTI according to an embodiment of the present invention. As shown in fig. 1, a method for transmitting sPDCCH in sTTI according to an embodiment of the present invention includes:
in step S101, the target terminal detects short PDCCH mode Format Indicator sPFI (short mode Format Indicator) transmitted in the control symbol field of the existing transmission time interval legacy TTI.
Specifically, the steps include: the target terminal detects the sPFI carried in the downlink control information DCI transmitted in the control symbol domain of the legacy TTI; or the target terminal detects the sPFI carried by the sPFICH in the short PDCCH mode format indication channel in the control symbol domain of the legacy TTI.
The base station transmits the sPFI to the user terminal through the control symbol field of the existing transmission time interval Legency TTI, and the user terminal detects the short mode format indication information transmitted in the control symbol field of the existing transmission time interval Legency TTI. Specifically, the base station adds X bits for carrying sPFI through first-level DCI (downlink Control Information) carried in the PDCCH of the legacy TTI, and transmits the first-level DCI to the user terminal through the PDCCH. The DCI carried in the PDCCH is named as first-stage DCI so as to be distinguished from second-stage DCI of the sPDCCH. In addition, the base station may further add a short Pattern Format Indicator Channel (short PDCCH mode Indicator Channel) to the control symbol domain of the legacy TTI, so as to carry the sPFI, and transmit the sPFI to the user terminal.
Next, in step S102, the target terminal determines, according to the detected sPFI, a position and a size of a frequency domain resource occupied by a short physical downlink control channel, sPDCCH, of the current subframe.
In particular, the sPFI is used to indicate which format of the set of transport formats the sPDCCH of the current subframe employs. Wherein, the transmission format set adopted by the sPDCCH adopts a predefined mode. Fig. 2 is a schematic diagram of an sPFI indication sPDCCH resource allocation provided in an embodiment of the present invention. As shown in fig. 2, for an sTTI with a length of two symbols, a transport format set includes four transport formats, where sPFI ═ 0, sPFI ═ 1, sPFI ═ 2, and sPFI ═ 3 correspond to one transport format, respectively, and each transport format includes a location and a size of a frequency domain resource. The shaded part in the figure is the frequency domain resource occupied by the control symbol of the current sTTI, that is, the frequency domain resource occupied by the sPDCCH of the sTTI, different sPFI values correspond to the frequency domain resources of different bandwidths and the frequency domain resources of different positions, and the frequency domain resource corresponding to the sPFI value is multiplexed by the sPDCCH of a plurality of different user terminals. The user terminal can know which format in the transmission format set is adopted by the sPDCCH of the current subframe according to the detected sPFI, so that the position and the size of the frequency domain resource occupied by the sPDCCH of the current subframe can be determined. Here, sTTI # i in the figure indicates the ith two-symbol sTTI.
Finally, in step S103, the target terminal performs blind detection in a corresponding sPDCCH search space according to the position and size of the frequency domain resource occupied by the sPDCCH, to obtain the sPDCCH belonging to the target terminal, where the sPDCCH search space includes the sPDCCH of multiple different terminals.
The method comprises the steps that the position and the size of frequency domain resources occupied by the sPDCCH comprise the position and the size of the frequency domain resources of the sPDCCH of a plurality of different user terminals, the sPDCCH of the plurality of different user terminals is multiplexed to the sPDCCH searching space, blind detection is carried out in the corresponding sPDCCH searching space, and the sPDCCH belonging to the current target user terminal is obtained.
Preferably, the method further comprises: and detecting downlink control information sDCI transmitted in the sPDCCH belonging to the target terminal, and receiving user data transmitted in the short physical downlink shared channel sPDSCH according to the sDCI. Specifically, the user terminal detects the sDCI transmitted in the sPDCCH belonging to the target terminal, and receives the user data transmitted in the short physical downlink shared channel sPDSCH according to the sDCI. In other words, the second level DCI is transmitted in the control symbol domain in the sTTI. Therefore, the user terminal can acquire the user data.
In the embodiment, short PDCCH mode format indication information sPFI transmitted in a control symbol field of an existing transmission time interval legacy TTI is detected by a user terminal; determining the position and the size of the frequency domain resource occupied by the short physical downlink control channel (sPDCCH) of the current subframe according to the detected sPFI; and performing blind detection in a corresponding sPDCCH search space according to the position and size of the frequency domain resource occupied by the sPDCCH to obtain the sPDCCH belonging to the target terminal, so that the frequency domain resource of the sPDCCH becomes flexible and configurable, and the utilization rate of the frequency domain resource in the sTTI is improved.
For simplicity of explanation, the method embodiments are described as a series of acts or combinations, but those skilled in the art will appreciate that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the embodiments of the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present invention. As shown in fig. 3, a terminal according to an embodiment of the present invention includes:
a first detecting unit 201, configured to detect short PDCCH mode format indication information sPFI transmitted in a control symbol field of an existing transmission time interval legacy TTI;
a determining unit 202, configured to determine, according to the detected sfi, a position and a size of a frequency domain resource occupied by a short physical downlink control channel, sPDCCH, of the current subframe;
the blind detection unit 203 is configured to perform blind detection in a corresponding sPDCCH search space according to the position and size of the frequency domain resource occupied by the sPDCCH, to obtain the sPDCCH belonging to the target terminal, where the sPDCCH search space includes the sPDCCH of multiple different terminals.
In an optional embodiment of the present invention, the first detecting unit 201 is specifically configured to:
detecting sPFI carried in downlink control information DCI transmitted in a control symbol domain of legacy TTI; or
Detecting the sPFI carried by the sPFICH indicated by the short PDCCH mode format indication channel in the control symbol domain of the legacy TTI.
In an optional embodiment of the present invention, the apparatus further comprises:
a second detecting unit 204, configured to detect downlink control information sDCI transmitted in an sPDCCH belonging to a target terminal, and receive user data transmitted in a short physical downlink shared channel sPDSCH according to the sDCI.
The specific details related to the terminal provided in an embodiment of the present invention have been described in detail in the transmission method of the sPDCCH in the sTTI provided in an embodiment of the present invention, and are not described again here.
Fig. 4 is a flowchart of a method for transmitting sPDCCH in sTTI according to an embodiment of the present invention. As shown in fig. 4, a method for transmitting sPDCCH in sTTI according to an embodiment of the present invention includes:
in step S301, sPFI is carried in the control symbol field of the legacy TTI.
Specifically, the loading the sPFI in the control symbol domain of the legacy TTI includes: adding X bits in DCI carried by a physical downlink control channel PDCCH for carrying sPFI; or adding a short PDCCH mode format indication channel (sPFCH) in a control symbol domain of the legacy TTI for carrying the sPFI, wherein the PDCCH occupies the first N symbols specified in the legacy TTI, the sPFCH occupies partial resources of the first N symbols, and X, N are constants.
Next, in step S302, the sPFI is transmitted to the user terminal through the control symbol field of the legacy TTI, so that the user terminal determines the sPDCCH belonging to the target terminal according to the sPFI.
Preferably, the method further comprises: and transmitting the sPFI to the user terminal every other preset period. In a specific embodiment, the preset period is B regular subframes. Wherein B is a constant.
Fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in fig. 5, a base station provided in an embodiment of the present invention includes:
a carrying unit 401, configured to carry the sPFI in the control symbol domain of the legacy TTI;
a transmitting unit 402, configured to transmit the sPFI to the user terminal through the control symbol field of the legacy TTI, so that the user terminal determines the sPDCCH belonging to the target terminal according to the sPFI.
In an optional embodiment of the present invention, the carrying unit 401 is specifically configured to:
adding X bits in DCI carried by a physical downlink control channel PDCCH, wherein X represents a constant and is used for carrying sPFI; or
And adding a short PDCCH mode format indication channel (sPFCH) in a control symbol domain of the legacy TTI, wherein the short PDCCH mode format indication channel is used for carrying sPFI.
In an optional embodiment of the present invention, the transmission unit 402 is further configured to:
and transmitting the sPFI to the user terminal every other preset period.
The specific details related to the base station provided in an embodiment of the present invention have been described in detail in the transmission method of the sPDCCH in the sTTI provided in an embodiment of the present invention, and are not described again here.
It should be noted that, in the respective components of the system of the present invention, the components therein are logically divided according to the functions to be implemented, but the present invention is not limited thereto, and the respective components may be re-divided or combined as needed, for example, some components may be combined into a single component, or some components may be further decomposed into more sub-components.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components in a system according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
The above embodiments are only suitable for illustrating the present invention and not limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (6)
1. A method for transmitting sPDCCH in sTTI, the method comprising:
the target terminal detects short PDCCH mode format indication information (sPFI) transmitted in a control symbol domain of the existing transmission time interval legacy TTI;
the target terminal determines the position and the size of the frequency domain resource occupied by the short physical downlink control channel (sPDCCH) of the current subframe according to the detected sPFI;
the target terminal carries out blind detection in a corresponding sPDCCH search space according to the position and the size of the frequency domain resource occupied by the sPDCCH to obtain the sPDCCH belonging to the target terminal, and the sPDCCH search space comprises the sPDCCH of a plurality of different terminals;
the target terminal detects short PDCCH mode format indication information (sPFI) transmitted in a control symbol domain of an existing transmission time interval (legacy TTI), and the detection comprises the following steps:
the target terminal detects the sPFI carried in the downlink control information DCI transmitted in the control symbol domain of the legacy TTI; or
The target terminal detects sPFI carried by a short PDCCH mode format indication channel sPFCH in a control symbol domain of legacy TTI;
different sPFI values correspond to frequency domain resources with different bandwidths and frequency domain resources at different positions, and the frequency domain resources corresponding to the sPFI values are multiplexed by sPDCCH of a plurality of different user terminals.
2. Method for transmission of sPDCCH in sTTI according to claim 1, characterized in that the method further comprises:
and detecting downlink control information sDCI transmitted in the sPDCCH belonging to the target terminal, and receiving user data transmitted in the short physical downlink shared channel sPDSCH according to the sDCI.
3. A terminal, characterized in that the terminal comprises:
the device comprises a first detection unit, a second detection unit and a control unit, wherein the first detection unit is used for detecting short PDCCH mode format indication information (sPFI) transmitted in a control symbol domain of the existing transmission time interval legacy TTI;
a determining unit, configured to determine, according to the detected sfi, a position and a size of a frequency domain resource occupied by a short physical downlink control channel, sPDCCH, of the current subframe;
the blind detection unit is used for carrying out blind detection in a corresponding sPDCCH search space according to the position and the size of the frequency domain resource occupied by the sPDCCH to obtain the sPDCCH belonging to a target terminal, and the sPDCCH search space comprises the sPDCCH of a plurality of different terminals;
the first detection unit is specifically configured to:
detecting sPFI carried in downlink control information DCI transmitted in a control symbol domain of legacy TTI; or
Detecting sPFI carried by sPFICH (physical downlink control channel) in a short PDCCH (physical downlink control channel) mode format indication channel in a legacy TTI (transmission time interval);
different sPFI values correspond to frequency domain resources with different bandwidths and frequency domain resources at different positions, and the frequency domain resources corresponding to the sPFI values are multiplexed by sPDCCH of a plurality of different user terminals.
4. The terminal of claim 3, further comprising:
and the second detection unit is used for detecting downlink control information sDCI transmitted in the sPDCCH belonging to the target terminal and receiving user data transmitted in the short physical downlink shared channel sPDSCH according to the sDCI.
5. A method for transmitting sPDCCH in sTTI, the method comprising:
loading the sPFI in a control symbol domain of a legacy TTI;
transmitting the sPFI to the user terminal through a control symbol domain of the legacy TTI, so that the user terminal determines the sPFCH belonging to the target terminal according to the sPFI;
the loading the sPFI in the control symbol domain of the legacy TTI includes:
adding X bits in DCI carried by a physical downlink control channel PDCCH, wherein X represents a constant and is used for carrying sPFI; or
Adding a short PDCCH mode format indication channel (sPFCH) in a control symbol domain of legacy TTI, wherein the short PDCCH mode format indication channel is used for bearing sPFIH;
different sPFI values correspond to frequency domain resources with different bandwidths and frequency domain resources at different positions, and the frequency domain resources corresponding to the sPFI values are multiplexed by sPDCCH of a plurality of different user terminals.
6. A base station, characterized in that the base station comprises:
the bearing unit is used for bearing the sPFI in a control symbol domain of the legacy TTI;
the transmission unit is used for transmitting the sPFI to the user terminal through the control symbol domain of the legacy TTI, so that the user terminal determines the sPFCH belonging to the target terminal according to the sPFI;
the bearing unit is specifically configured to:
adding X bits in DCI carried by a physical downlink control channel PDCCH, wherein X represents a constant and is used for carrying sPFI; or
Adding a short PDCCH mode format indication channel (sPFCH) in a control symbol domain of legacy TTI, wherein the short PDCCH mode format indication channel is used for bearing sPFIH;
different sPFI values correspond to frequency domain resources with different bandwidths and frequency domain resources at different positions, and the frequency domain resources corresponding to the sPFI values are multiplexed by sPDCCH of a plurality of different user terminals.
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| CN111865518A (en) * | 2019-04-26 | 2020-10-30 | 普天信息技术有限公司 | Downlink transmission method and device of 5G unlicensed spectrum |
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| CN102740372A (en) * | 2011-04-15 | 2012-10-17 | 中兴通讯股份有限公司 | Method and apparatus for sending downlink control information |
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