CN111865522B - Channel indication and determination method, device, user equipment and base station - Google Patents
Channel indication and determination method, device, user equipment and base station Download PDFInfo
- Publication number
- CN111865522B CN111865522B CN201910353560.8A CN201910353560A CN111865522B CN 111865522 B CN111865522 B CN 111865522B CN 201910353560 A CN201910353560 A CN 201910353560A CN 111865522 B CN111865522 B CN 111865522B
- Authority
- CN
- China
- Prior art keywords
- parameter
- layer
- channel
- proprietary
- shared
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides a channel indication and determination method, a device, user equipment and a base station, wherein the channel indication method is applied to UE (user equipment), and the method comprises the following steps: establishing a PMI parameter group, wherein the PMI parameter group comprises a shared parameter and a plurality of special parameter groups, the shared parameter is shared by a plurality of layers of channels, each special parameter group comprises a special parameter reported by each layer of channel, and the first special parameter in each special parameter group is a special parameter corresponding to the optimal layer of channel; and sending CSI feedback to a base station, wherein the CSI feedback comprises the PMI parameter group. The invention can reduce the cost of CSI feedback.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for indicating and determining a channel, a user equipment, and a base station.
Background
When a base station schedules a PDSCH (Physical Downlink Shared Channel) including a DMRS (Demodulation Reference Signal), a UE (User Equipment) performs Channel estimation on the DMRS and performs data Demodulation by using estimated Channel information. If the scheduled PDSCH includes multiple layers of data, it includes a multi-port DMRS, and each port can estimate one layer of channel information.
When the carrier frequency is high, the signal transmitted by the base station contains strong phase noise, which affects the data demodulation performance. To estimate and cancel the Phase noise, Rel-15NR defines PTRS (Phase-noise Tracking Reference Signals). If the base station configuration PTRS exists, when one PDSCH is scheduled, the PTRS is located in the time frequency resource of the PDSCH. After the UE receives the PDSCH, the PTRS in the PDSCH is used for phase noise estimation, and then the estimated phase offset is used for compensating the data signals in the PDSCH, so that the data decoding accuracy is improved.
Rel-15NR supports scheduling one PDSCH to contain at most 8 layers of data, and correspondingly contains at most 8 ports of DMRS. While the phase noise affects each layer of data uniformly, the PTRS contains only 1 port. Furthermore, the NR protocol provides that the PTRS port is associated only with the smallest port number of the DMRS port, i.e. is transmitted only in the first layer channel. Therefore, the base station needs to ensure that the channel condition of the first layer is optimal, thereby improving the noise estimation accuracy of the PTRS.
A base station refers to CSI (Channel State Information) feedback of a UE to construct a multi-layer Channel, and the UE needs to indicate, in the CSI feedback, a Channel quality of which layer in the multi-layer Channel corresponding to a PMI (Pre-coding Matrix Indicator, also called a codebook)And (4) optimizing. In Rel-15NR, an optimal Layer of a multi-Layer channel corresponding to a PMI in CSI feedback may be any one Layer, so an LI (Layer Indicator) parameter is introduced into the CSI feedback to explicitly indicate an optimal Layer index in the fed-back multi-Layer channel, and if the CSI feedback v Layer is present, the LI occupies
Bits indicating one of the layers, thereby increasing the overhead of CSI feedback.
Disclosure of Invention
The channel indication and determination method, the device, the user equipment and the base station provided by the invention can reduce the cost of CSI feedback.
In a first aspect, the present invention provides a channel indication method, where the method is applied to a UE, and the method includes:
establishing a PMI parameter group, wherein the PMI parameter group comprises a shared parameter and a plurality of special parameter groups, the shared parameter is shared by a plurality of layers of channels, each special parameter group comprises a special parameter reported by each layer of channel, and the first special parameter in each special parameter group is a special parameter corresponding to the optimal layer of channel;
and sending CSI feedback to a base station, wherein the CSI feedback comprises the PMI parameter group.
Optionally, the shared parameter is a spatial beam index set.
Optionally, the plurality of proprietary parameter sets include a frequency domain beam index set for each layer, a strongest coefficient index for each layer, a reference coefficient amplitude value for each layer, a non-zero coefficient index for each layer, a non-zero differential amplitude sequence for each layer, and a phase sequence for each layer.
In a second aspect, the present invention provides a channel determination method, which is applied to a base station, and includes:
receiving CSI feedback sent by UE, wherein the CSI feedback comprises the PMI parameter group, the PMI parameter group comprises shared parameters and a plurality of proprietary parameter groups, the shared parameters are shared by multiple layers of channels, each proprietary parameter group comprises proprietary parameters reported by each layer of channels, and the first proprietary parameter in each proprietary parameter group is the proprietary parameter corresponding to the optimal layer of channel;
and determining the first layer as the optimal layer of the feedback channel according to the PMI parameter group.
In a third aspect, the present invention provides a channel indication apparatus, where the apparatus is located in a UE, and the apparatus includes:
the system comprises an establishing unit, a transmitting unit and a receiving unit, wherein the establishing unit is used for establishing a PMI parameter group, the PMI parameter group comprises a shared parameter and a plurality of special parameter groups, the shared parameter is shared by multiple layers of channels, each special parameter group comprises a special parameter reported by each layer of channel, and the first special parameter in each special parameter group is a special parameter corresponding to the optimal layer of channel;
a sending unit, configured to send CSI feedback to a base station, where the CSI feedback includes the PMI parameter set.
Optionally, the shared parameter is a spatial beam index set.
Optionally, the plurality of sets of proprietary parameters includes a frequency domain beam index set for each layer, a strongest coefficient index for each layer, a reference coefficient amplitude value for each layer, a non-zero coefficient index for each layer, a non-zero differential amplitude sequence for each layer, and a phase sequence for each layer.
In a fourth aspect, the present invention provides a channel determination apparatus, the apparatus being located at a base station, the apparatus comprising:
a receiving unit, configured to receive CSI feedback sent by a UE, where the CSI feedback includes the PMI parameter set, where the PMI parameter set includes a shared parameter and multiple proprietary parameter sets, where the shared parameter is shared by multiple layers of channels, each proprietary parameter set includes a proprietary parameter reported by each layer of channel, and a first proprietary parameter in each proprietary parameter set is a proprietary parameter corresponding to an optimal layer of channel;
and the determining unit is used for determining the first layer as the optimal layer of the feedback channel according to the PMI parameter group.
In a fifth aspect, the present invention provides a user equipment, where the user equipment includes the above channel indication apparatus.
In a sixth aspect, the present invention provides a base station, which includes the above channel determining apparatus.
In the channel indication and determination method and apparatus, the user equipment and the base station provided in the embodiments of the present invention, a PMI parameter set in a CSI feedback sent by the UE to the base station includes a shared parameter and a plurality of proprietary parameter sets, each proprietary parameter set includes a proprietary parameter reported by each layer of channel, and a first proprietary parameter in each proprietary parameter set is a proprietary parameter corresponding to an optimal layer channel, so that it can be ensured that the first layer is a feedback channel optimal layer, the base station can determine that the first layer is a feedback channel optimal layer according to the PMI parameter set, and the PMI parameter set carries channel optimal layer information, thereby implementing implicit layer indication and reducing overhead of CSI feedback.
Drawings
Fig. 1 is a flowchart of a channel indication method according to an embodiment of the present invention;
fig. 2 is a flowchart of a channel determination method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a channel indicating device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a channel determination 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 channel indication method, which is applied to a UE, and as shown in fig. 1, the method includes:
s11, establishing a PMI parameter group, wherein the PMI parameter group comprises a shared parameter and a plurality of proprietary parameter groups, wherein the shared parameter is shared by multiple layers of channels, each proprietary parameter group comprises a proprietary parameter reported by each layer of channel, and the first proprietary parameter in each proprietary parameter group is a proprietary parameter corresponding to the optimal layer of channel.
S12, sending CSI feedback to the base station, wherein the CSI feedback comprises the PMI parameter group.
In the channel indication method provided in the embodiment of the present invention, the PMI parameter set in the CSI feedback sent by the UE to the base station includes a shared parameter and multiple proprietary parameter sets, each proprietary parameter set includes a proprietary parameter reported by each layer of channel, and a first proprietary parameter in each proprietary parameter set is a proprietary parameter corresponding to an optimal layer channel, so that it can be ensured that the first layer is an optimal layer of the feedback channel, and an implicit layer indication is implemented by using the PMI parameter set to carry channel optimal layer information, thereby reducing the overhead of CSI feedback.
The shared parameter is a space domain beam index set, the space domain beam index set comprises a beam index set and oversampling offset thereof, and each layer of channel shares the space domain beam index set.
The plurality of proprietary parameter sets comprise a frequency domain beam index set of each layer, a strongest coefficient index of each layer, a reference coefficient amplitude value of each layer, a non-zero coefficient index of each layer, a non-zero differential amplitude sequence of each layer, and a phase sequence of each layer.
Each proprietary parameter set is described below:
frequency domain beam index set for each layer: the method comprises a group of beam index groups reported by each layer of channel.
Strongest coefficient index per layer: the maximum coefficient amplitude value is satisfied, the maximum amplitude is fixed to be 1, and other amplitude values are subjected to equal-scale scaling; fixing the phase of the strongest coefficient to 0, correspondingly rotating other phase values, and respectively reporting a group of parameters by each layer of channel.
Reference coefficient amplitude value for each layer: and carrying out high-precision quantization on the amplitude value of the coefficient at the corresponding position of the other polarization direction opposite to the polarization direction of the strongest coefficient, and reporting a group of parameters by each layer of channel respectively.
Non-zero coefficient index for each layer: and indicating the position of the nonzero coefficient, and reporting a group of parameters by each layer of channel respectively.
Non-zero difference amplitude sequence for each layer: and reporting a group of parameters respectively by each layer of channel according to the difference amplitude values of other nonzero coefficients except the strongest coefficient and the reference coefficient.
Phase sequence for each layer: and the phase values of other nonzero coefficients except the strongest coefficient report a group of parameters respectively by each layer of channel.
An embodiment of the present invention provides a channel determination method, which is applied to a base station, and as shown in fig. 2, the method includes:
and S21, receiving CSI feedback sent by the UE, wherein the CSI feedback comprises the PMI parameter group, the PMI parameter group comprises a shared parameter and a plurality of proprietary parameter groups, the shared parameter is shared by multiple layers of channels, each proprietary parameter group comprises a proprietary parameter reported by each layer of channel, and the first proprietary parameter in each proprietary parameter group is a proprietary parameter corresponding to the optimal layer of channel.
And S22, determining the first layer as the optimal layer of the feedback channel according to the PMI parameter group.
In the channel determining method provided by the embodiment of the present invention, a PMI parameter set in CSI feedback received by a base station includes a shared parameter and a plurality of proprietary parameter sets, each proprietary parameter set includes a proprietary parameter reported by each layer of channel, and a first proprietary parameter in each proprietary parameter set is a proprietary parameter corresponding to an optimal layer channel, so that it can be ensured that the first layer is an optimal layer of the feedback channel, the base station can determine that the first layer is the optimal layer of the feedback channel according to the PMI parameter set, and an implicit layer indication is implemented by using the PMI parameter set to carry channel optimal layer information, thereby reducing the overhead of CSI feedback.
In Rel-16NR, in CSI feedback based on a low-overhead TypeII PMI, when the PMI is established, UE exchanges the order of partial parameters aiming at a first layer and an optimal layer in the PMI, thereby ensuring that the first layer is the optimal layer of a feedback channel. After receiving the PMI, the base station does not need to know how the UE adjusts, and can directly determine that the first layer indicated by the PMI is the optimal layer of the feedback channel.
An embodiment of the present invention further provides a channel indication apparatus, where the apparatus is located in a UE, and as shown in fig. 3, the apparatus includes:
the apparatus includes an establishing unit 11, configured to establish a PMI parameter set, where the PMI parameter set includes a shared parameter and multiple proprietary parameter sets, where the shared parameter is shared by multiple layers of channels, each proprietary parameter set includes a proprietary parameter reported by each layer of channel, and a first proprietary parameter in each proprietary parameter set is a proprietary parameter corresponding to an optimal layer of channel;
a sending unit 12, configured to send CSI feedback to a base station, where the CSI feedback includes the PMI parameter set.
In the channel indication device provided in the embodiment of the present invention, the PMI parameter set in the CSI feedback sent to the base station includes a shared parameter and a plurality of proprietary parameter sets, each proprietary parameter set includes a proprietary parameter reported by each layer of channel, and a first proprietary parameter in each proprietary parameter set is a proprietary parameter corresponding to an optimal layer channel, so that it can be ensured that the first layer is an optimal layer of the feedback channel, and an implicit layer indication is implemented by using the PMI parameter set to carry channel optimal layer information, thereby reducing the overhead of CSI feedback.
Optionally, the shared parameter is a spatial beam index set.
Optionally, the plurality of proprietary parameter sets include a frequency domain beam index set for each layer, a strongest coefficient index for each layer, a reference coefficient amplitude value for each layer, a non-zero coefficient index for each layer, a non-zero differential amplitude sequence for each layer, and a phase sequence for each layer.
The apparatus of this embodiment may be configured to implement the technical solution of the above channel indication method embodiment, and the implementation principle and the technical effect are similar, which are not described herein again.
An embodiment of the present invention further provides a channel determining apparatus, where the apparatus is located in a base station, and as shown in fig. 4, the apparatus includes:
a receiving unit 21, configured to receive CSI feedback sent by a UE, where the CSI feedback includes the PMI parameter set, where the PMI parameter set includes a shared parameter and multiple proprietary parameter sets, where the shared parameter is shared by multiple layers of channels, each proprietary parameter set includes a proprietary parameter reported by each layer of channel, and a first proprietary parameter in each proprietary parameter set is a proprietary parameter corresponding to an optimal layer of channel;
a determining unit 22, configured to determine, according to the PMI parameter set, that the first layer is the feedback channel optimal layer.
In the channel determining apparatus provided in the embodiment of the present invention, the received PMI parameter set in the CSI feedback sent by the UE includes a shared parameter and a plurality of proprietary parameter sets, each proprietary parameter set includes a proprietary parameter reported by each layer of channel, and a first proprietary parameter in each proprietary parameter set is a proprietary parameter corresponding to an optimal layer channel, so that it can be ensured that the first layer is an optimal layer of the feedback channel, the base station can determine that the first layer is the optimal layer of the feedback channel according to the PMI parameter set, and an implicit layer indication is implemented by using the PMI parameter set to carry channel optimal layer information, thereby reducing overhead of CSI feedback.
The apparatus of this embodiment may be configured to implement the technical solution of the foregoing channel determination method embodiment, and the implementation principle and the technical effect are similar, which are not described herein again.
The embodiment of the invention also provides user equipment which comprises the channel indicating device.
The embodiment of the invention also provides a base station, which comprises the channel determining device.
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 (10)
1. A channel indication method applied to a UE (user equipment), the method comprising:
establishing a PMI parameter group, wherein the PMI parameter group comprises a shared parameter and a plurality of special parameter groups, the shared parameter is shared by a plurality of layers of channels, each special parameter group comprises a special parameter reported by each layer of channel, and a first special parameter in each special parameter group is a special parameter corresponding to an optimal layer of channel so as to determine that the first layer is the optimal layer of the feedback channel;
and sending CSI feedback to a base station, wherein the CSI feedback comprises the PMI parameter group.
2. The method of claim 1, wherein the shared parameter is a spatial beam index set.
3. The method of claim 1, wherein the plurality of sets of proprietary parameters comprise a set of frequency domain beam indices for each layer, a strongest coefficient index for each layer, a reference coefficient amplitude value for each layer, a non-zero coefficient index for each layer, a non-zero differential amplitude sequence for each layer, and a phase sequence for each layer.
4. A channel determination method, applied to a base station, the method comprising:
receiving CSI feedback sent by UE, wherein the CSI feedback comprises a PMI parameter group, the PMI parameter group comprises a shared parameter and a plurality of proprietary parameter groups, the shared parameter is shared by multiple layers of channels, each proprietary parameter group comprises a proprietary parameter reported by each layer of channel, and the first proprietary parameter in each proprietary parameter group is a proprietary parameter corresponding to the optimal layer of channel;
and determining the first layer as the optimal layer of the feedback channel according to the PMI parameter group.
5. An apparatus for channel indication, the apparatus being located at a UE, the apparatus comprising:
the system comprises an establishing unit, a feedback unit and a feedback unit, wherein the establishing unit is used for establishing a PMI parameter group, the PMI parameter group comprises a shared parameter and a plurality of special parameter groups, the shared parameter is shared by multiple layers of channels, each special parameter group comprises a special parameter reported by each layer of channel, and a first special parameter in each special parameter group is a special parameter corresponding to an optimal layer of a channel so as to determine that the first layer is the optimal layer of the feedback channel;
a sending unit, configured to send CSI feedback to a base station, where the CSI feedback includes the PMI parameter set.
6. The apparatus of claim 5, wherein the shared parameter is a spatial beam index set.
7. The apparatus of claim 5, wherein the plurality of sets of proprietary parameters comprise a set of frequency domain beam indices for each layer, a strongest coefficient index for each layer, a reference coefficient amplitude value for each layer, a non-zero coefficient index for each layer, a non-zero differential amplitude sequence for each layer, and a phase sequence for each layer.
8. An apparatus for channel determination, the apparatus being located at a base station, the apparatus comprising:
a receiving unit, configured to receive CSI feedback sent by a UE, where the CSI feedback includes the PMI parameter set, where the PMI parameter set includes a shared parameter shared by multiple layers of channels and multiple proprietary parameter sets, each proprietary parameter set includes a proprietary parameter reported by each layer of channel, and a first proprietary parameter in each proprietary parameter set is a proprietary parameter corresponding to an optimal layer of channel;
and the determining unit is used for determining the first layer as the optimal layer of the feedback channel according to the PMI parameter group.
9. A user equipment, characterized in that the user equipment comprises the channel indication device according to any of claims 5 to 7.
10. A base station, characterized in that the base station comprises the channel determination apparatus of claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910353560.8A CN111865522B (en) | 2019-04-29 | 2019-04-29 | Channel indication and determination method, device, user equipment and base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910353560.8A CN111865522B (en) | 2019-04-29 | 2019-04-29 | Channel indication and determination method, device, user equipment and base station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111865522A CN111865522A (en) | 2020-10-30 |
| CN111865522B true CN111865522B (en) | 2022-08-26 |
Family
ID=72966551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910353560.8A Active CN111865522B (en) | 2019-04-29 | 2019-04-29 | Channel indication and determination method, device, user equipment and base station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111865522B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111199A (en) * | 2017-05-05 | 2018-06-01 | 中兴通讯股份有限公司 | Feedback, method of reseptance and device, equipment, the storage medium of channel state information |
| CN108288989A (en) * | 2017-01-09 | 2018-07-17 | 华为技术有限公司 | Channel state information feedback method, user equipment and base station |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9967012B2 (en) * | 2015-05-06 | 2018-05-08 | Samsung Electronics Co., Ltd. | Method and apparatus for channel state information (CSI) reporting |
-
2019
- 2019-04-29 CN CN201910353560.8A patent/CN111865522B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108288989A (en) * | 2017-01-09 | 2018-07-17 | 华为技术有限公司 | Channel state information feedback method, user equipment and base station |
| CN108111199A (en) * | 2017-05-05 | 2018-06-01 | 中兴通讯股份有限公司 | Feedback, method of reseptance and device, equipment, the storage medium of channel state information |
Non-Patent Citations (1)
| Title |
|---|
| Summary of views on CSI reporting v3;Ericsson;《3GPP TSG-RAN WG1 Meeting #94bis R1-1811943》;20181012;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111865522A (en) | 2020-10-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9961582B2 (en) | Configuration of coordinated multipoint transmission hypotheses for channel state information reporting | |
| CN105991231B (en) | Method and device for acquiring Channel State Information (CSI) | |
| US9363700B2 (en) | Method and device for reporting channel state | |
| RU2600533C1 (en) | Method and terminal for determining channel state information | |
| US8923427B2 (en) | Codebook sub-sampling for frequency-selective precoding feedback | |
| WO2017050086A1 (en) | Method, device and system for acquiring channel parameter configuration | |
| US10362505B2 (en) | Method and terminal for handling channel state information | |
| US9660707B2 (en) | Precoding method, base station and user equipment | |
| KR20180120222A (en) | Data transmission methods and devices | |
| WO2017167156A1 (en) | Dmrs transmission method and device | |
| CN105450332B (en) | A kind of three dimensional channel status information determines method and device | |
| WO2012030687A1 (en) | Combined channel state information and combined channel quality indicator in wireless communication systems | |
| CN109644022A (en) | Method and apparatus for resetting radio receiver channels estimation | |
| WO2017194010A1 (en) | Pilot information transmitting method and device, and pilot information receiving method and device | |
| US20150139022A1 (en) | Method and system for data demodulation, and user equipment | |
| WO2017185982A1 (en) | Method and device for quasi-co-location type processing, and computer storage medium | |
| CN111865522B (en) | Channel indication and determination method, device, user equipment and base station | |
| WO2022083412A1 (en) | Csi-rs enhanced transmission method and apparatus | |
| WO2017186064A1 (en) | Channel state information feedback and reception method and apparatus | |
| WO2018058921A1 (en) | Hybrid channel state information feedback method, terminal device and base station | |
| CN115333582B (en) | Precoding information | |
| EP4092922B1 (en) | Precoding information | |
| WO2023124943A1 (en) | Method and apparatus for determining precoding indication mode | |
| WO2024026796A1 (en) | Method and apparatus for determining precoding matrix for uplink mimo transmission | |
| CN118138085A (en) | Precoding information |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |