CN103188814A - Resource scheduling method and system for improving CRS (cell-specific reference signal) power in LTE (long term evolution) system - Google Patents

Resource scheduling method and system for improving CRS (cell-specific reference signal) power in LTE (long term evolution) system Download PDF

Info

Publication number
CN103188814A
CN103188814A CN201310121704XA CN201310121704A CN103188814A CN 103188814 A CN103188814 A CN 103188814A CN 201310121704X A CN201310121704X A CN 201310121704XA CN 201310121704 A CN201310121704 A CN 201310121704A CN 103188814 A CN103188814 A CN 103188814A
Authority
CN
China
Prior art keywords
power
reference signal
user
crs
symbol
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.)
Granted
Application number
CN201310121704XA
Other languages
Chinese (zh)
Other versions
CN103188814B (en
Inventor
蒋一鸣
李翔
汪玲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Datang Mobile Communications Equipment Co Ltd
Original Assignee
Datang Mobile Communications Equipment Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Datang Mobile Communications Equipment Co Ltd filed Critical Datang Mobile Communications Equipment Co Ltd
Priority to CN201310121704.XA priority Critical patent/CN103188814B/en
Publication of CN103188814A publication Critical patent/CN103188814A/en
Application granted granted Critical
Publication of CN103188814B publication Critical patent/CN103188814B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

The invention relates to the technical field of wireless communication, and discloses a resource scheduling method for improving CRS (cell-specific reference signal) power in an LTE (long term evolution) system. The method comprises the steps that a sign power containing a reference signal and the sign power not containing the reference signal of a user to be scheduled are respectively calculated, and the highest power is selected; if current service power margin is greater than or equal to the highest power, the user is scheduled, and the service power margin is updated to be the difference of the current service power margin and the largest power; if the current service power margin is less than the largest power, the available PRB (physical resource block) quantity is calculated, if the PRB quantity is not less than the minimum scheduling resource unit, the PRB quantity is taken as the restriction for scheduling the user, and the available power margin is updated to be zero, otherwise the user is not scheduled. According to the resource scheduling method, the sending power promotion value of the CRS is guaranteed through controlling the transmission resource of the data signs in promotion of the CRS power, so as to enhance downlink coverage.

Description

In the LTE system, improve resource regulating method and the system of CRS power
Technical field
The present invention relates to wireless communication technology field, particularly a kind of resource regulating method and system that in the LTE system, improves CRS power.
Background technology
Allocating cell public reference signal (Cell-specific Reference Signal, CRS) pilot signal transmitted power, it is Long Term Evolution (Long Term Evolution, LTE) basic function of system that the CRS pilot signal is sent with different power.Under the situation that system bandwidth is determined, the number of CRS determines that also the gross power of CRS Resource Unit (CRS Resource Element, CRS RE) and data resource unit (data RE) can not surpass the single carrier maximum power of agreement regulation.Therefore if only promote the power (namely promoting CRS power) of CRS RE, the power of data RE is not processed, the power on the whole symbol is raised, so that surpasses the single carrier maximum transmission power.Physical layer finds that total power value surpasses this maximum transmission power; in order to protect radio-frequency devices not to be damaged; power on each resource can be unified compressed again; the power of CRS RE can be lowered again after the compression; do not reach the purpose that promotes CRS RE power, thereby do not reach the purpose that strengthens descending covering yet.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how to improve CRS RE power effectively, to improve descending covering power.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of resource regulating method that in the LTE system, improves CRS power, comprise step:
Calculate respectively and treat that dispatched users contains the symbol power of reference signal and do not contain the symbol power of reference signal, and get maximum power;
If the current power headroom that uses is more than or equal to described maximum power, then dispatches described user, and upgrade that can to use power headroom be described current the poor of power headroom and described maximum power of using;
If the current power headroom that uses is less than described maximum power, then calculate the current Physical Resource Block PRB(Physical Resource Block that can use of user, PRB) quantity, if described PRB quantity is not less than minimum scheduling resource unit, serve as that described user is dispatched in restriction with described PRB quantity then, and upgrade that can to use power headroom be 0, otherwise do not dispatch this user.
Wherein, calculating the concrete mode that the scheduled user contains the symbol power of reference signal and do not contain the symbol power of reference signal respectively is:
E A=E CRS×P_a
E B=E A×ρ B/ρ A
Wherein, E AExpression does not comprise orthogonal frequency division multiplex OFDM (Orthogonal Frequency Division Multiplexing, OFDM) the Resource Unit energy of symbol, the E of reference symbol BExpression comprises the Resource Unit energy of the OFDM symbol of reference symbol, E CRSThe transmitted power of the exclusive reference signal in expression residential quarter, P_a is the specific semi-static parameter of subscriber equipment, ρ AExpression does not comprise the ratio of Physical Downlink Shared Channel PDSCH power and CRS RE power in the OFDM symbol of the exclusive reference signal in residential quarter; ρ BExpression comprises the ratio of PDSCH power and CRS RE power in the OFDM symbol of the exclusive reference signal in residential quarter.
Wherein, the concrete mode of the current PRB quantity that can use of described calculating user is:
The single PRB of used power headroom before PRB quantity=this user of scheduling/Max(contains the symbol user power of reference signal, and single PRB does not contain the symbol user power of reference signal), wherein, Max is for getting max function.
The present invention also provides a kind of resource scheduling system that improves CRS power in the LTE system, comprising:
Power computation module is used for calculating respectively and treats that dispatched users contains the symbol power of reference signal and do not contain the symbol power of reference signal, and gets maximum power;
The power comparing module is used for dispatching described user current when using power headroom more than or equal to described maximum power, and upgrades that can to use power headroom be described current the poor of power headroom and described maximum power of using;
The restriction scheduler module, be used in the current current Physical Resource Block PRB quantity that can use of user of then calculating when using power headroom less than described maximum power, if described PRB quantity is not less than minimum scheduling resource unit, serve as that described user is dispatched in restriction with described PRB quantity then, and upgrade that can to use power headroom be 0, otherwise do not dispatch this user.
Wherein, described power computation module is calculated as follows the symbol power that the scheduled user contains the symbol power of reference signal and do not contain reference signal respectively:
E A=E CRS×P_a
E B=E A×ρ B/ρ A
Wherein, E AExpression does not comprise the Resource Unit energy of the orthogonal frequency division multiplex OFDM symbol of reference symbol, E BExpression comprises the Resource Unit energy of the OFDM symbol of reference symbol, E CRSThe transmitted power of the exclusive reference signal in expression residential quarter, P_a is the specific semi-static parameter of subscriber equipment, ρ AExpression does not comprise the ratio of Physical Downlink Shared Channel PDSCH power and CRS RE power in the OFDM symbol of the exclusive reference signal in residential quarter; ρ BExpression comprises the ratio of PDSCH power and CRS RE power in the OFDM symbol of the exclusive reference signal in residential quarter.
Wherein, described restriction scheduler module is calculated as follows the PRB quantity that the user can use:
The single PRB of used power headroom before PRB quantity=this user of scheduling/Max(contains the symbol user power of reference signal, and single PRB does not contain the symbol user power of reference signal), wherein, Max is for getting max function.
(3) beneficial effect
The present invention is by when promoting CRS power, and the mode of control transmission data RE quantity has guaranteed the transmitted power lifting values of CRS to have strengthened descending covering power simultaneously.
Description of drawings
Fig. 1 is a kind of resource regulating method flow chart that improves CRS power in the LTE system of the embodiment of the invention;
Fig. 2 is a kind of resource scheduling system structural representation that improves CRS power in the LTE system of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
The resource regulating method that improves CRS power in the LTE system of present embodiment comprises as shown in Figure 1:
Step S110 calculates the symbol power that the scheduled user contains the symbol power of reference signal (RS) and do not contain reference signal respectively, and gets maximum power.Specifically in conjunction with the configuration of the port number of this residential quarter and pilot tone pattern (can get the RE number of CRS symbol and data symbol on each symbol), can calculate the symbol power that this user contains RS and do not contain RS respectively.
E A=E CRS×P_a
E B=E A×ρ B/ρ A
PDSCH(Physical Downlink Shared Channel, Physical Downlink Shared Channel) the EPRE(descending power control of going up data RE determines the energy of every resource particle) be divided into two classes: type A and type B.Wherein, type A is the data resource unit (data RE) that does not comprise the OFDM symbol of reference symbol, and type B is the data resource unit (data RE) that comprises the OFDM symbol of reference symbol.
E AEvery Resource Unit energy E PRE of the PDSCH RE of expression type A, unit is W;
E BEvery Resource Unit energy E PRE of the PDSCH RE of expression type B, unit is W;
E CRSThe transmitted power of the exclusive reference signal in expression residential quarter, unit is W, is pre-configured parameter;
P_a is the specific semi-static parameter of user equipment (UE), and the radio resource managing unit RRC appointment by high level is used for determining the exclusive parameter of UE, ρ AExpression does not comprise the power of the PDSCH in the OFDM symbol of the exclusive reference signal in residential quarter and the ratio of CRS RE power; ρ BExpression comprises the power of the PDSCH in the OFDM symbol of the exclusive reference signal in residential quarter and the ratio of CRS RE power.Following table is to the intrinsic ratio ρ in the residential quarter of 1,2 or 4 residential quarter fixed antenna ports in the agreement 36.213rel910 version B/ ρ AStandard.
Can calculate respectively in conjunction with the information in the last table and to get maximum power after this user contains RS and do not contain the symbol power of RS.
Step S120 subtracts each other power headroom and maximum power before the scheduling, and judges that whether difference is more than or equal to 0.
Step S130, more than or equal to 0, then this user can dispatch and not do the resource restriction, enters the normal consistency flow process as if difference.And the renewal power headroom is the difference after subtracting each other with maximum power.
Step S140, if difference is less than 0, then calculate physical radio carrying (PRB) quantity that this user of scheduling can use: the single PRB of the used power headroom before PRB quantity=this user of scheduling/Max(contains the symbol user power of RS, and single PRB does not contain the symbol user power of RS).
Step S150, judge the PRB quantity calculate whether less than minimum scheduling resource unit (with realize relevant, each producer's difference), as if less than, this user's non-scheduling then.
Step S160 if the PRB quantity that calculates is not less than minimum scheduling resource unit, serves as that this user is dispatched in restriction with the PRB quantity that calculates then, enters the normal consistency flow process, dispatches to upgrade power headroom behind this user and be set to 0.
A PRB comprises a plurality of data RE, has limited the PRB number and has been equivalent to reduce data RE number.In order to improve the downstream signal covering power, the power of data RE must increase along with the raising of CRSRE power, therefore, adopt the number that reduces data RE to make the gross power of CRS and data RE can not surpass the single carrier maximum power of agreement regulation, promoted the downstream signal covering power simultaneously again.
The resource regulating method that improves CRS power in the LTE system of the present invention is by when promoting CRS power, and the mode of control data symbol transfer resource guarantees the transmitted power lifting values of CRS, thereby strengthens descending covering.Control the data symbol transfer resource in addition and can guarantee that also the power of data RE also is improved or remains unchanged under the situation that CRS power improves.Moreover this processing mode need not increase interface, and logic is clear and definite, realizes simply, do not increase difficulty and the workload of product development.
The present invention also provides a kind of resource scheduling system that improves CRS power in the LTE system, comprising:
Power computation module 210 is used for calculating respectively and treats that dispatched users contains the symbol power of reference signal and do not contain the symbol power of reference signal, and gets maximum power;
Power comparing module 220 is used for dispatching described user current when using power headroom more than or equal to described maximum power, and upgrades that can to use power headroom be described current the poor of power headroom and described maximum power of using;
Restriction scheduler module 230, be used in the current current PRB quantity that can use of user of then calculating when using power headroom less than described maximum power, if described PRB quantity is not less than minimum scheduling resource unit, serve as that described user is dispatched in restriction with described PRB quantity then, and upgrade that can to use power headroom be 0, otherwise do not dispatch this user.
Power computation module 210 is calculated as follows the symbol power that the scheduled user contains the symbol power of reference signal and do not contain reference signal respectively:
E A=E CRS×P_a
E B=E A×ρ B/ρ A
Wherein, E AExpression does not comprise the Resource Unit energy of the OFDM symbol of reference symbol, E BExpression comprises the Resource Unit energy of the OFDM symbol of reference symbol, E CRSThe transmitted power of the exclusive reference signal in expression residential quarter, P_a is the specific semi-static parameter of subscriber equipment, ρ AExpression does not comprise the ratio of Physical Downlink Shared Channel PDSCH power and CRS RE power in the OFDM symbol of the exclusive reference signal in residential quarter; ρ BExpression comprises the ratio of PDSCH power and CRS RE power in the OFDM symbol of the exclusive reference signal in residential quarter.
Restriction scheduler module 230 is calculated as follows the PRB quantity that the user can use:
The single PRB of used power headroom before PRB quantity=this user of scheduling/Max(contains the symbol user power of reference signal, and single PRB does not contain the symbol user power of reference signal), wherein, Max is for getting max function.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (6)

1. a resource regulating method that improves CRS power in the LTE system is characterized in that, comprises step:
Calculate respectively and treat that dispatched users contains the symbol power of reference signal and do not contain the symbol power of reference signal, and get maximum power;
If the current power headroom that uses is more than or equal to described maximum power, then dispatches described user, and upgrade that can to use power headroom be described current the poor of power headroom and described maximum power of using;
If the current power headroom that uses is less than described maximum power, then calculate the current Physical Resource Block PRB quantity that can use of user, if described PRB quantity is not less than minimum scheduling resource unit, serve as that described user is dispatched in restriction with described PRB quantity then, and upgrade that can to use power headroom be 0, otherwise do not dispatch this user.
2. the resource regulating method that improves CRS power in the LTE system as claimed in claim 1 is characterized in that, calculates the concrete mode that the scheduled user contains the symbol power of reference signal and do not contain the symbol power of reference signal respectively to be:
E A=E CRS×P_a
E B=E A×ρ B/ρ A
Wherein, E AExpression does not comprise the Resource Unit energy of the orthogonal frequency division multiplex OFDM symbol of reference symbol, E BExpression comprises the Resource Unit energy of the OFDM symbol of reference symbol, E CRSThe transmitted power of the exclusive reference signal in expression residential quarter, P_a is the specific semi-static parameter of subscriber equipment, ρ AExpression does not comprise the ratio of Physical Downlink Shared Channel PDSCH power and CRS RE power in the OFDM symbol of the exclusive reference signal in residential quarter; ρ BExpression comprises the ratio of PDSCH power and CRS RE power in the OFDM symbol of the exclusive reference signal in residential quarter.
3. the resource regulating method that improves CRS power in the LTE system as claimed in claim 1 is characterized in that, the concrete mode of the current PRB quantity that can use of described calculating user is:
The single PRB of used power headroom before PRB quantity=this user of scheduling/Max(contains the symbol user power of reference signal, and single PRB does not contain the symbol user power of reference signal), wherein, Max is for getting max function.
4. a resource scheduling system that improves CRS power in the LTE system is characterized in that, comprising:
Power computation module is used for calculating respectively and treats that dispatched users contains the symbol power of reference signal and do not contain the symbol power of reference signal, and gets maximum power;
The power comparing module is used for dispatching described user current when using power headroom more than or equal to described maximum power, and upgrades that can to use power headroom be described current the poor of power headroom and described maximum power of using;
The restriction scheduler module, be used in the current current Physical Resource Block PRB quantity that can use of user of then calculating when using power headroom less than described maximum power, if described PRB quantity is not less than minimum scheduling resource unit, serve as that described user is dispatched in restriction with described PRB quantity then, and upgrade that can to use power headroom be 0, otherwise do not dispatch this user.
5. the resource scheduling system that improves CRS power in the LTE system as claimed in claim 4 is characterized in that described power computation module is calculated as follows the symbol power that the scheduled user contains the symbol power of reference signal and do not contain reference signal respectively:
E A=E CRS×P_a
E B=E A×ρ B/ρ A
Wherein, E AExpression does not comprise the Resource Unit energy of the orthogonal frequency division multiplex OFDM symbol of reference symbol, E BExpression comprises the Resource Unit energy of the OFDM symbol of reference symbol, E CRSThe transmitted power of the exclusive reference signal in expression residential quarter, P_a is the specific semi-static parameter of subscriber equipment, ρ AExpression does not comprise the ratio of Physical Downlink Shared Channel PDSCH power and CRS RE power in the OFDM symbol of the exclusive reference signal in residential quarter; ρ BExpression comprises the ratio of PDSCH power and CRS RE power in the OFDM symbol of the exclusive reference signal in residential quarter.
6. the resource scheduling system that improves CRS power in the LTE system as claimed in claim 4 is characterized in that described restriction scheduler module is calculated as follows the PRB quantity that the user can use:
The single PRB of used power headroom before PRB quantity=this user of scheduling/Max(contains the symbol user power of reference signal, and single PRB does not contain the symbol user power of reference signal), wherein, Max is for getting max function.
CN201310121704.XA 2013-04-09 2013-04-09 Resource regulating method and the system of CRS power is improved in LTE system Active CN103188814B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310121704.XA CN103188814B (en) 2013-04-09 2013-04-09 Resource regulating method and the system of CRS power is improved in LTE system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310121704.XA CN103188814B (en) 2013-04-09 2013-04-09 Resource regulating method and the system of CRS power is improved in LTE system

Publications (2)

Publication Number Publication Date
CN103188814A true CN103188814A (en) 2013-07-03
CN103188814B CN103188814B (en) 2015-10-28

Family

ID=48679697

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310121704.XA Active CN103188814B (en) 2013-04-09 2013-04-09 Resource regulating method and the system of CRS power is improved in LTE system

Country Status (1)

Country Link
CN (1) CN103188814B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104284439A (en) * 2013-07-10 2015-01-14 中国移动通信集团公司 Dispatching method and device for user terminal
WO2015042942A1 (en) * 2013-09-30 2015-04-02 华为技术有限公司 Method and device for controlling uplink power
CN106941716A (en) * 2016-01-04 2017-07-11 中兴通讯股份有限公司 A kind of sending method of cell common reference signal, device and base station
CN110012533A (en) * 2018-01-05 2019-07-12 大唐移动通信设备有限公司 A kind of resource allocation methods and device
CN110708756A (en) * 2018-07-09 2020-01-17 成都鼎桥通信技术有限公司 Resource allocation method and equipment based on channel power
WO2022206298A1 (en) * 2021-04-02 2022-10-06 大唐移动通信设备有限公司 Resource configuration method and apparatus for uplink control channel, device, and storage medium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102196564A (en) * 2010-03-19 2011-09-21 电信科学技术研究院 Method and equipment for allocating uplink shared resources
WO2012026676A2 (en) * 2010-08-25 2012-03-01 주식회사 케이티 Method and apparatus for scheduling a downlink packet in a wireless communication system
CN102638894A (en) * 2012-04-27 2012-08-15 电信科学技术研究院 Method and equipment for distributing PDSCH (physical downlink shared channel) power

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102196564A (en) * 2010-03-19 2011-09-21 电信科学技术研究院 Method and equipment for allocating uplink shared resources
WO2012026676A2 (en) * 2010-08-25 2012-03-01 주식회사 케이티 Method and apparatus for scheduling a downlink packet in a wireless communication system
CN102638894A (en) * 2012-04-27 2012-08-15 电信科学技术研究院 Method and equipment for distributing PDSCH (physical downlink shared channel) power

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104284439A (en) * 2013-07-10 2015-01-14 中国移动通信集团公司 Dispatching method and device for user terminal
CN104284439B (en) * 2013-07-10 2018-05-11 中国移动通信集团公司 The dispatching method and device of a kind of user terminal
WO2015042942A1 (en) * 2013-09-30 2015-04-02 华为技术有限公司 Method and device for controlling uplink power
CN106941716A (en) * 2016-01-04 2017-07-11 中兴通讯股份有限公司 A kind of sending method of cell common reference signal, device and base station
WO2017118098A1 (en) * 2016-01-04 2017-07-13 中兴通讯股份有限公司 Cell common reference signal sending method and apparatus, and base station
CN110012533A (en) * 2018-01-05 2019-07-12 大唐移动通信设备有限公司 A kind of resource allocation methods and device
CN110012533B (en) * 2018-01-05 2020-09-25 大唐移动通信设备有限公司 Resource allocation method and device
CN110708756A (en) * 2018-07-09 2020-01-17 成都鼎桥通信技术有限公司 Resource allocation method and equipment based on channel power
CN110708756B (en) * 2018-07-09 2023-01-31 成都鼎桥通信技术有限公司 Resource allocation method and equipment based on channel power
WO2022206298A1 (en) * 2021-04-02 2022-10-06 大唐移动通信设备有限公司 Resource configuration method and apparatus for uplink control channel, device, and storage medium

Also Published As

Publication number Publication date
CN103188814B (en) 2015-10-28

Similar Documents

Publication Publication Date Title
CN103188814B (en) Resource regulating method and the system of CRS power is improved in LTE system
CN102316535B (en) Transmission method for downlink control information and equipment
CN102143593B (en) Combined adaptive resource allocation method and device for PDCCH (Physical Downlink Control Channel)
WO2022214013A1 (en) Resource determination method and apparatus, and terminal, network-side device and storage medium
CN104054359A (en) Inter-cell interference coordination for E-PDCCH
TW202114370A (en) Information determination method and device, information adjustment method, usage method of threshold value, terminal, and storage medium
CN101895988A (en) Control channel resource allocation method and device
CN103535088A (en) Mobile station, and method used in wireless communication system
CN103476121A (en) Method and apparatus for bit-level PDSCH muting and/or receiver puncturing in LTE-advanced heterogeneous networks
CN105246164A (en) Data transmission method and data transmission device for ultra-dense network
CN105917691A (en) Wireless resource sharing method and device
CN105430755A (en) Data transmission method and data transmission apparatus used for ultra-dense network
WO2019214745A1 (en) Modulation and coding and cqi reporting method, device, apparatus, and storage medium
CN102412950A (en) Coordination system of power of downlink control channel and method thereof
CN101841819A (en) Dispatching method for reducing interference of PDCCH of a plurality of small areas of LTE system and device
CN103533628B (en) A kind of downlink power distributing method
CN103457711A (en) Method and device for determining the number of OFDM symbols occupied by control channel
CN102118870A (en) Method and device for dispatching terminal
CN103973425A (en) Downlink control channel resource distribution method
CN112567825B (en) Method and apparatus for determining additional maximum power reduction per carrier for dual carrier operation
CN102595611B (en) control channel allocation method and device
CN102378372A (en) Carrier component scheduling method
CN102316519B (en) Method and device for regulating value of physical control format indicator channel
CN108023676A (en) A kind of modulation system control method, device and base station
CN103369651A (en) Method for allocating downlink transmission power in long-term evolution system and device thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant