CN110972271B - Method and device for transmitting initial signal and user equipment - Google Patents

Method and device for transmitting initial signal and user equipment Download PDF

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Publication number
CN110972271B
CN110972271B CN201811141340.0A CN201811141340A CN110972271B CN 110972271 B CN110972271 B CN 110972271B CN 201811141340 A CN201811141340 A CN 201811141340A CN 110972271 B CN110972271 B CN 110972271B
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initial
time slot
coreset
channel
initial signal
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CN110972271A (en
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刘莹莹
沈兴亚
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Spreadtrum Semiconductor Nanjing Co Ltd
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Spreadtrum Semiconductor Nanjing Co Ltd
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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
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention provides a method and a device for transmitting an initial signal and user equipment. The method comprises the following steps: receiving an initial signal sent by a base station after LBT is successfully performed, wherein the initial signal indicates information about a channel occupying a search space of a core set in an initial part of a time slot, or indicates a structure of the channel occupying the initial part of the time slot; and performing CORESET detection at a corresponding position according to the related information of the CORESET search space in the initial part of the time slot occupied by the channel or the structure of the initial part of the time slot occupied by the channel. The invention can indicate the detection position of CORESET, reduce the blind detection complexity of UE and achieve the purpose of energy saving.

Description

Method and device for transmitting initial signal and user equipment
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for transmitting an initial signal, and a user equipment.
Background
With the rapid development of smart phones, the continuous increase of network speed provides necessary infrastructure for the mobile phones to simultaneously run multiple functions, which also brings about rapid consumption of the power of the terminal, which directly affects user experience. Therefore, the demand for power saving of the terminal is increasing.
In an NR (New Radio, New air interface) unlicensed spectrum system, a base station wants to transmit data to a user through a certain channel, and must first detect whether the certain channel is idle through an LBT (Listen Before Talk) mechanism. After the LBT is successful, the user performs PDCCH (Physical Downlink Control Channel) blind detection, and can receive PDSCH (Physical Downlink Shared Channel) data after decoding the PDCCH successfully. However, after LBT is successful, the base station is not always ready to transmit data immediately, and therefore, the success or failure of LBT affects the start position of the COT (Channel Occupancy Time), but the start position of the COT cannot be fixed at the slot boundary. In order to quickly access and utilize resources in a time domain as much as possible, a UE (User Equipment) has a very dense monitoring period of a PDCCH in a partial slot (partial slot) initiated by a COT, and has a relatively large blind detection complexity and power consumption.
The agreement agreed upon on RAN1#93 conference mentions that a low complexity initial signal can be set to reduce power waste caused by multiple PDCCH detections within the initial partial slot. Based on this, a discussion about initial signals is presented by several companies.
The prior art discusses the importance of the initial signal, and proposes that the base station sends the initial signal after LBT is successful to trigger the UE to perform core-Resource Set (CORESET) detection, but the detection position of CORESET is not mentioned or indicated.
Disclosure of Invention
The method, the device and the user equipment for transmitting the initial signal can indicate the detection position of CORESET, reduce the blind detection complexity of UE and achieve the aim of saving energy.
In a first aspect, the present invention provides a method for transmitting an initial signal, including:
receiving an initial signal sent by a base station after LBT is successfully performed, wherein the initial signal indicates information about a channel occupying a search space of a core set in an initial part of a time slot, or indicates a structure of the channel occupying the initial part of the time slot;
and performing CORESET detection at a corresponding position according to the related information of the CORESET search space in the initial part of the time slot occupied by the channel or the structure of the initial part of the time slot occupied by the channel.
Optionally, the initial signal indicates the number, period and position of the channels occupying the search space of the CORESET in the initial part of the time slot.
Optionally, the initial signal indicates that the channel occupies the initial part of the time slot and is formed by combining one or more minislots with the length of 2, 4 or 7 OFDM symbols.
Optionally, the corresponding CORESET detection position in the initial part of the time slot is preconfigured or indicated by RRC signaling.
Optionally, the corresponding CORESET detection position in the initial partial timeslot is indicated by a different PSS/SSS sequence combination indication table, or indicated by a different initialization sequence indication table.
In a second aspect, the present invention provides an apparatus for transmitting an initial signal, including:
a receiving unit, configured to receive an initial signal sent by a base station after LBT is successfully performed, where the initial signal indicates information about a channel occupying a search space of CORESET within an initial fractional time slot, or the initial signal indicates a channel occupying a structure of the initial fractional time slot;
and the detection unit is used for executing CORESET detection at a corresponding position according to the related information of the CORESET search space in the initial part of the time slot occupied by the channel or the structure of the initial part of the time slot occupied by the channel.
Optionally, the initial signal indicates the number, period and position of the channels occupying the search space of the CORESET in the initial part of the time slot.
Optionally, the initial signal indicates that the channel occupies the initial part of the time slot and is formed by combining one or more minislots with the length of 2, 4 or 7 OFDM symbols.
Optionally, the corresponding CORESET detection position in the initial part of the time slot is preconfigured or indicated by RRC signaling.
Optionally, the corresponding CORESET detection position in the initial partial time slot is indicated by a different PSS/SSS sequence combination indication table, or indicated by a different initialization sequence indication table.
In a third aspect, the present invention provides a user equipment, where the user equipment includes the above-mentioned initial signal transmission apparatus.
According to the transmission method and device for the initial signal and the user equipment, the initial signal sent by the base station after LBT is successfully executed is received, the initial signal indicates the relevant information of the CORESET search space in the initial part time slot occupied by the channel or indicates the structure of the CORESET search space in the initial part time slot occupied by the channel, further, according to the relevant information of the CORESET search space in the initial part time slot occupied by the channel or the structure of the initial part time slot occupied by the channel, CORESET detection is carried out at the corresponding position, the blind detection complexity of UE can be reduced, and the purpose of energy saving is achieved; in addition, the CORESET detection position can be flexibly indicated, and the scheduling flexibility is improved.
Drawings
Fig. 1 is a flowchart illustrating a method for transmitting an initial signal according to an embodiment of the present invention;
fig. 2, fig. 3 and fig. 4 are schematic diagrams of a transmission method of an initial signal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an initial signal transmission apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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.
An embodiment of the present invention provides a method for transmitting an initial signal, where as shown in fig. 1, the method includes:
s11, the UE receives an initial signal sent by the base station after LBT is successfully performed, where the initial signal indicates information about a channel occupying a search space of CORESET in the time initial part of the time slot, or the initial signal indicates a channel occupying a configuration of the time initial part of the time slot.
S12, the UE executes CORESET detection at the corresponding position according to the related information of the CORESET search space in the initial part time slot occupied by the channel or the structure of the initial part time slot occupied by the channel.
According to the initial signal transmission method provided by the embodiment of the invention, an initial signal sent by a base station after LBT is successfully executed is received, the initial signal indicates the relevant information of the CORESET search space in the initial part time slot occupied by the channel or indicates the structure of the CORESET search space in the initial part time slot occupied by the channel, and further CORESET detection is carried out at the corresponding position according to the relevant information of the CORESET search space in the initial part time slot occupied by the channel or the structure of the CORESET search space in the initial part time slot occupied by the channel, so that the blind detection complexity of UE can be reduced, and the purpose of energy saving is achieved; in addition, the CORESET detection position can be flexibly indicated, and the scheduling flexibility is improved.
The following describes the transmission method of the initial signal according to the embodiment of the present invention in detail.
The first embodiment is as follows:
after the gbb successfully performs LBT, an initial signal is transmitted. The CORESET detection within the initial partial slot is triggered by the initial signal. The initial signal indicates the number, period, location, etc. of the search spaces (search spaces) of the CORESET within the COT initial partial slot. After receiving the initial signal, the UE performs CORESET detection at the corresponding location. A schematic diagram is given below.
As shown in fig. 2, the initial signal indicates that the number of search spaces is 4 and the period is 2 symbols;
as shown in fig. 3, the initial signal indicates that the number of search spaces is 2 and the period is 4 symbols;
as shown in fig. 4, the initial signal indicates that the number of search spaces is 1 and the period is 7 symbols;
a partial slot is outlined in fig. 3 because the base station is not necessarily ready to transmit data immediately after LBT is successful, and thus is illustrated.
The second embodiment:
after the gbb successfully performs LBT, an initial signal is transmitted. The CORESET detection within the initial partial slot is triggered by the initial signal. The initial signal indicates the composition of the COT initial partial slot. The partial slot is formed by combining one or more mini-slots (micro slots) with the length of 2, 4 or 7 OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the corresponding CORESET detection position in the initial partial slot is pre-configured or indicated by a Radio Resource Control (RRC) signaling. There are two indication ways:
(1) indicating tables by different PSS (Primary Synchronization Signal)/SSS (Secondary Synchronization Signal) sequence combinations;
(2) the tables are indicated by different initialization sequences.
As shown in Table 1, the Initial slot refers to the length of the current starting slot after LBT is successful. I.e. the RRC indicates a certain row of the table, the length of the corresponding start slot and the composition of the mini-slot are indicated.
And the UE carries out CORESET detection at the corresponding mini-slot position.
TABLE 1 micro-slots configured by RRC
Index initial slot Mini slot
0 13 2+4+7
1 12 4+4+4
2 11 4+7
3 10 2+4+4
4 9 2+7
5 8 4+4
6 7 7
7 6 2+4
8 5 1(gap)+4
9 4 4
10 3 1(gap)+2
11 2 2
12 1 Indicate the next slot
An embodiment of the present invention further provides a device for transmitting an initial signal, as shown in fig. 5, where the device includes:
a receiving unit 11, configured to receive an initial signal sent by a base station after LBT is successfully performed, where the initial signal indicates information about a channel occupying a search space of CORESET within an initial fractional time slot, or the initial signal indicates a channel occupying a configuration of the initial fractional time slot;
and the detecting unit 12 is configured to perform CORESET detection at a corresponding position according to the related information of the CORESET search space in the initial partial time slot occupied by the channel or the configuration of the initial partial time slot occupied by the channel.
The initial signal transmission device provided by the embodiment of the invention receives an initial signal sent by a base station after LBT is successfully executed, wherein the initial signal indicates the relevant information of the CORESET search space in the initial part of time slot occupied by a channel or indicates the structure of the CORESET search space in the initial part of time slot occupied by the channel, and further the CORESET detection is carried out at the corresponding position according to the relevant information of the CORESET search space in the initial part of time slot occupied by the channel or indicates the structure of the CORESET search space in the initial part of time slot occupied by the channel, so that the blind detection complexity of UE can be reduced, and the purpose of energy saving is achieved; in addition, the CORESET detection position can be flexibly indicated, and the scheduling flexibility is improved.
Optionally, the initial signal indicates the number, period and position of the channels occupying the search space of the CORESET in the initial part of the time slot.
Optionally, the initial signal indicates that the channel occupies the initial partial time slot of time and is formed by combining one or more minislots with the length of 2, 4 or 7 OFDM symbols.
Optionally, the corresponding CORESET detection location within the initial partial time slot is preconfigured or indicated by RRC signaling.
Optionally, the corresponding CORESET detection position in the initial partial time slot is indicated by a different PSS/SSS sequence combination indication table, or indicated by a different initialization sequence indication table.
The apparatus of this embodiment may be configured to implement the technical solutions of the method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
The embodiment of the invention also provides the user equipment which comprises the transmission device of the initial signal.
It will be understood by those skilled in the art that all or part of the processes of the embodiments of the methods described above may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (11)

1. A method for transmitting an initial signal, comprising:
receiving an initial signal sent by a base station after LBT is successfully executed, wherein the initial signal indicates the relevant information of the channel occupying the search space of CORESET in the time initial part time slot, or indicates the structure of the time initial part time slot occupied by the channel;
and performing CORESET detection at a corresponding position according to the related information of the CORESET search space in the initial part of the time slot occupied by the channel or the structure of the initial part of the time slot occupied by the channel.
2. The method of claim 1 wherein the initial signal indicates the number, period and location of channels occupying the CORESET search space within the initial portion of the time slot.
3. The method of claim 1, wherein the initial signal indicates that the channel occupies an initial portion of the time slot and is a combination of one or more minislots of 2, 4, or 7 OFDM symbols in length.
4. The method of claim 3, wherein the corresponding CORESET detection location within the initial partial time slot is preconfigured or indicated by RRC signaling.
5. The method of claim 4, wherein corresponding CORESET detection positions in the initial partial time slot are indicated by different PSS/SSS sequence combination indication tables or by different initialization sequence indication tables.
6. An apparatus for transmitting an initial signal, comprising:
a receiving unit, configured to receive an initial signal sent by a base station after LBT is successfully performed, where the initial signal indicates information about a channel occupying a search space of CORESET within an initial fractional time slot, or the initial signal indicates a channel occupying a configuration of the initial fractional time slot;
and the detection unit is used for executing CORESET detection at a corresponding position according to the related information of the CORESET search space in the initial part of the time slot occupied by the channel or the structure of the initial part of the time slot occupied by the channel.
7. The apparatus of claim 6 wherein the initial signal indicates the number, period and location of the channels occupying the CORESET search space within the initial portion of the time slot.
8. The apparatus of claim 6, wherein the initial signal indicates that the channel occupies an initial portion of the time slot and is a combination of one or more minislots of 2, 4, or 7 OFDM symbols in length.
9. The apparatus of claim 8, wherein the corresponding CORESET detection location within the initial partial time slot is preconfigured or indicated by RRC signaling.
10. The apparatus of claim 9, wherein corresponding CORESET detection positions within the initial partial slot are indicated by different PSS/SSS sequence combination indication tables or by different initialization sequence indication tables.
11. A user equipment, characterized in that it comprises transmission means of an initial signal according to any one of claims 6 to 10.
CN201811141340.0A 2018-09-28 2018-09-28 Method and device for transmitting initial signal and user equipment Active CN110972271B (en)

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CN110972271B true CN110972271B (en) 2022-09-20

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