WO2021063109A1 - 上行授权请求控制方法、装置、终端及存储介质 - Google Patents
上行授权请求控制方法、装置、终端及存储介质 Download PDFInfo
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- WO2021063109A1 WO2021063109A1 PCT/CN2020/108161 CN2020108161W WO2021063109A1 WO 2021063109 A1 WO2021063109 A1 WO 2021063109A1 CN 2020108161 W CN2020108161 W CN 2020108161W WO 2021063109 A1 WO2021063109 A1 WO 2021063109A1
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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
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- the present invention claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910944771.9, and the invention title is "Uplink Authorization Request Control Method, Device, Terminal, and Storage Medium” on September 30, 2019, and the entire content of the application Incorporated in the present invention by reference.
- the present invention relates to the field of communications, and in particular to a method, device, terminal and storage medium for controlling an uplink authorization request.
- NB-IoT Narrow Band Internet of Things
- IoT Internet of Things
- LPWAN Low Power Wide Area Network
- NB-IoT only supports a narrowband bandwidth of 200K, this represents a shortage of air interface resources.
- the introduction of the NB-IoT multi-carrier function has been accompanied.
- the wireless connection status of the terminal and the NB-IoT cell is inconsistent, that is, under the base station.
- a radio link release (RRC Connection Release) is sent, but the terminal side does not receive it. The terminal side considers it to be in the connected state, and the base station side considers the terminal to be in an idle state, which leads to inconsistent states, which means that the terminal is out of synchronization.
- the terminal When the terminal is in the out-of-synchronization state, when the terminal needs to send uplink data, because the terminal side thinks that it is in the connected state, it directly initiates the uplink service scheduling authorization (Service Request, SR) in the connected state. In the R13/R14 protocol, it is initiated for the terminal The SR needs to process the uplink authorization request from MSG1 to MSG3. The signaling overhead of this process is relatively large and the steps are complicated; however, since the base station side considers the terminal to be in an idle state, it will not respond to the SR message of the terminal. According to the relevant standard protocol, since the terminal side cannot receive the SR response, it will always initiate an SR request to the base station until the number of transmissions reaches the maximum number of repetitions N specified in the system message.
- Service Request Service Request
- the terminal repeatedly transmits N times SR will not necessarily receive a response from the base station, but it needs to process the uplink authorization request from MSG1 to MSG3 N times, resulting in wasting a lot of NB-IoT air interface bandwidth resources, aggravating air interface resource tension, and wasting terminal resources and batteries. Electricity; also reduces the efficiency of NB-IoT business processing.
- the embodiment of the present invention provides an uplink authorization request control method, device, terminal and storage medium.
- a terminal in an out-of-synchronization state needs to initiate an SR, it can only send SRs to the maximum number of repetitions N It can be stopped only when it is time, which leads to a great waste of resources and reduces the problem of NB-IoT business processing efficiency.
- an embodiment of the present invention provides an uplink authorization request control method, including: sending an uplink service scheduling authorization request to a base station, and obtaining the current performance parameters of the base station; and determining that the current meets the handover according to the performance parameters When the condition is met, and when the response to the uplink service scheduling authorization request is not received, it is determined that the current state is out of synchronization, and the sending of the uplink service scheduling authorization request to the base station is stopped.
- an embodiment of the present invention also provides an uplink authorization request control device, including: a sending module, configured to send an uplink service scheduling authorization request to a base station; and an acquiring module, configured to obtain current performance parameters of the base station;
- the processing module is configured to determine that when the handover condition is currently met and the response to the uplink service scheduling authorization request is not received according to the performance parameters, determine that it is currently in an out-of-synchronization state, and stop sending the uplink service scheduling authorization to the base station request.
- an embodiment of the present invention also provides a terminal, including a processor, a memory, and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute the The stored computer program is used to implement the steps of the uplink authorization request control method as described above.
- embodiments of the present invention also provide a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned uplink authorization request is realized Steps of the control method.
- FIG. 1 is a schematic flowchart of an uplink authorization request control method according to Embodiment 1 of the present invention
- FIG. 2 is a schematic structural diagram of an uplink authorization request control device according to the second embodiment of the present invention.
- FIG. 3 is a schematic diagram 1 of an uplink authorization request control process according to the second embodiment of the present invention.
- FIG. 4 is a schematic diagram of the second embodiment of the control flow of uplink authorization request according to the second embodiment of the present invention.
- FIG. 5 is a schematic diagram of the third embodiment of the control flow of uplink authorization request according to the second embodiment of the present invention.
- FIG. 6 is a schematic diagram of the fourth embodiment of the control flow of uplink authorization request according to the second embodiment of the present invention.
- FIG. 7 is a schematic diagram 5 of an uplink authorization request control process according to the second embodiment of the present invention.
- FIG. 8 is a schematic diagram of a terminal structure according to Embodiment 3 of the present invention.
- a terminal in an out-of-synchronization state needs to initiate an SR, it can only stop when the number of times the SR is sent reaches the maximum number of repetitions N, which leads to a huge waste of resources and reduces the problem of NB-IoT service processing efficiency.
- the terminal when the terminal sends an uplink service scheduling authorization request to the base station, it obtains the current performance parameters of the base station. According to the performance parameters, it is determined that the handover conditions are currently met and the response to the uplink service scheduling authorization request is not received.
- stop sending uplink service scheduling authorization requests to the base station thereby avoiding repeating sending uplink service scheduling authorization requests to the base station that will not receive a correct response, improving the resource utilization of the base station and the terminal side, and NB-IoT Business processing efficiency.
- S101 Send an uplink service scheduling authorization request to the base station, and obtain the current performance parameters of the base station.
- the terminal has established a normal wireless connection with the NB-IoT cell on the base station side before sending the uplink service scheduling authorization request to the base station. Therefore, in this step, when the terminal sends an uplink service scheduling authorization request to the base station, the terminal may actually be in a normal connection state, or may be in an out-of-synchronization state (that is, the terminal believes that it is in a normal connection state due to various factors). , And the base station considers it to be in an idle state).
- the terminal can directly initiate a connected uplink service scheduling authorization request to the base station when it needs to send uplink data; of course, the terminal can also be triggered by other conditions to initiate an uplink service scheduling authorization request to the base station.
- the uplink authorization request control method shown in FIG. 1 can be applied to, but not limited to, the narrowband IoT.
- the terminal in FIG. 1 is an NB-IoT terminal
- the base station is an NB-IoT base station.
- the uplink authorization request control method shown in FIG. 1 can also be applied to other network scenarios, and the corresponding terminals and base stations are the terminals and base stations in the corresponding network scenarios.
- the terminal sends the uplink service scheduling authorization request to the base station, which may be any time before the maximum number of repeated transmissions N.
- the terminal currently sends the uplink service scheduling authorization request to the base station for the nth time.
- the value of n may be any integer value from 1 to N. Therefore, in step S101, after the terminal currently sends an uplink service scheduling authorization request to the base station, it can record and update the current value of n, that is, how many times it is currently sending an uplink service scheduling authorization request to the base station, and can set the value of n The value is also used as part of the performance parameter.
- the acquired current performance parameter of the base station may be any parameter that can be used to evaluate whether the current set handover condition is satisfied.
- S102 According to the acquired performance parameters, when it is determined that the handover condition is currently met and the base station has not received a response to the uplink service scheduling authorization request sent in S101, it is determined that the current is in an out-of-synchronization state, and the uplink service scheduling authorization request is stopped to the base station. .
- the terminal sends an uplink service scheduling authorization request to the base station and obtains the current performance parameters of the base station; when the terminal determines that the handover conditions are currently met according to the performance parameters, and does not receive a response to the uplink service scheduling authorization request, It is determined that it is currently in an out-of-synchronization state and stops sending uplink service scheduling authorization requests to the base station; there is no need to wait until the number of sending uplink service scheduling authorization requests reaches the maximum number of repetitions N, so the resources on the base station side and the terminal side can be improved Utilization rate, and business processing efficiency of NB-IoT.
- the terminal when it determines that it is currently in an out-of-synchronization state, it may also include the terminal resending an access request to the base station to re-establish a connection with the base station as soon as possible, and then continue normal corresponding services, thereby improving service processing efficiency.
- the terminal when it is determined according to the acquired performance parameters that the handover conditions are not currently met, and the base station has not received a response to the uplink service scheduling authorization request sent in S101, and the current number of transmissions n is less than N, the terminal can continue Send an uplink service scheduling authorization request to the base station, and then go to the above S101, and continue to judge until a normal response from the base station is received, or the current number of transmissions n is equal to N.
- the terminal may determine whether the handover condition is currently satisfied according to the performance parameters obtained from the base station.
- the handover condition may include determining but not limited to at least one of the following based on the obtained performance parameters, then It is considered that the switching condition is satisfied.
- the current resource of the base station is short, the downlink channel quality is not currently hopped, and the current number n of continuously sending uplink service scheduling authorization requests to the base station is equal to the preset first handover frequency threshold N1.
- the acquired performance parameters it is determined that the current resources of the base station are not in short supply, the downlink channel quality is not currently hopped, and the current number of consecutively sending uplink service scheduling authorization requests to the base station n is equal to the preset second switching frequency threshold N2.
- the quality of the downlink channel is currently hopping.
- N1 is less than the maximum number of retransmissions of the uplink service scheduling authorization request N, and N2 is less than N1.
- the current resource of the base station is in short supply, and it can be determined whether at least one of the uplink resource and the downlink resource of the base station is in short supply. For example, in some examples, it can be determined whether the uplink resources of the base station are in short supply, in other examples, it can be determined whether the downlink resources of the base station are in short supply, and in other examples, it can also be determined whether the uplink resources and downlink resources are in short supply; correspondingly It is possible to determine whether the uplink resources and/or downlink resources on the base station side are in short supply through any parameter that can reflect the resource situation of the base station side.
- the current utilization of uplink bandwidth and/or downlink bandwidth can be obtained to determine whether the uplink resources and/or downlink resources on the base station side are in short supply; other performance parameters can also be obtained to determine whether the uplink resources and/or downlink resources on the base station side are in short supply.
- obtaining performance parameters may include, but is not limited to: at least one of uplink scheduling response parameters and downlink scheduling response parameters.
- the terminal may determine that the current resource of the base station is short when detecting at least one of the following.
- the value of the uplink scheduling response parameter is greater than the value of the normal uplink scheduling response parameter.
- the value of the downlink scheduling response parameter is greater than the value of the normal downlink scheduling response parameter.
- the value of the normal uplink scheduling response parameter and the value of the normal downlink scheduling response parameter can be set according to experience or based on detection when the terminal is not in the out-of-synchronization state, and the base station responds when the uplink scheduling and downlink scheduling normally respond to the terminal Value.
- the terminal can obtain various parameters that can reflect the uplink scheduling response of the base station to determine whether the uplink resources on the base station side are in short supply. For example, when the performance parameter obtained by the terminal includes an uplink scheduling response parameter, the obtained uplink scheduling response parameter includes at least one of a first uplink scheduling response delay time and a second uplink scheduling response delay time.
- the first uplink scheduling response delay time Delay0 includes: when the uplink service scheduling authorization request is sent for the current n times, the response phase Msg2 of the preamble access phase Msg1 is the average duration between the start position of the narrowband physical downlink control channel and the end position of Msg1; the second uplink The scheduling response delay time Delay1 includes: the average duration between the start position of the Msg2 narrowband physical downlink control channel and the start position of the Msg2 narrowband physical downlink shared channel when the uplink service scheduling authorization request is sent for the current n times.
- the terminal can also obtain various parameters that can reflect the downlink scheduling response of the base station to determine whether the downlink resources on the base station side are in short supply.
- the performance parameters acquired by the terminal include downlink scheduling response parameters
- the acquired downlink scheduling response parameters include: downlink scheduling response delay time
- the downlink scheduling response delay time Delay2 includes: the uplink data when the uplink service scheduling authorization request is sent for the current n times The average duration between the start position of Msg3 in the request phase and the end position of the Msg2 narrowband physical downlink shared channel.
- the acquired performance parameters may include any various parameters that can evaluate the quality of the downlink channel, for example, may include the downlink channel quality indicator parameter; in this embodiment, when the downlink channel quality indicator parameter is detected When the difference between the value and the value of the normal downlink channel quality indicator parameter is greater than or equal to the preset difference threshold, it is determined that the downlink channel quality is currently hopping; the value of the normal downlink channel quality indicator parameter is the downlink channel quality under the normal communication environment Indicates the value of the parameter.
- the specific value of the preset difference threshold can be flexibly set according to specific application scenarios.
- the downlink channel quality indicator parameter may include, but is not limited to: the average downlink channel signal-to-noise ratio measured when the uplink service scheduling authorization request is sent for the current n times.
- the uplink authorization request control method provided in this embodiment achieves the effect of quickly correcting the out-of-synchronization state of the connection with the base station when the terminal is connected to the base station out of synchronization, and saves mouth space. Resources, improve the uplink data transmission efficiency when the connection with the base station is out of synchronization.
- the uplink authorization request control device can be set in a terminal, as shown in FIG. 2, which includes the following modules.
- the sending module 201 is configured to send an uplink service scheduling authorization request to the base station.
- the sending process refer to the above-mentioned embodiment, which will not be repeated here.
- the obtaining module 202 is configured to obtain the current performance parameters of the base station. For the specific obtaining process, refer to the above-mentioned embodiment, which will not be repeated here.
- the processing module 203 is configured to determine that when the handover condition is currently met and the base station's response to the uplink service scheduling authorization request is not received according to the performance parameters obtained by the obtaining module 202, it is determined that it is currently in an out-of-synchronization state and stops sending uplink services to the base station Scheduling authorization requests.
- the specific processing process refer to the above-mentioned embodiment, which will not be repeated here.
- the functions of the sending module 201 described above in this embodiment can be implemented by, but not limited to, the radio frequency module of the terminal, and the functions of the acquisition module 202 and the processing module 203 can be implemented by, but not limited to, the processor of the terminal.
- the NB-IoT terminal obtains the maximum number of SR attempts according to system messages, where the number of repetitions is inconsistent for different coverage levels.
- the NB-IoT base station can be configured with up to three coverage levels (CEL0, CEL1, CEL2), and the number of repetitions corresponding to each coverage level is (M0, M1, M2).
- the maximum number of SR attempts of the CEL0 terminal is M0+M1+M2
- the maximum number of SR attempts of the CEL1 terminal is M1+M2
- the maximum number of SR attempts of the CEL2 terminal is M2.
- FIG. 3 An exemplary uplink authorization request control method is shown in FIG. 3, which includes the following steps.
- the NB-IoT terminal (hereinafter referred to as the terminal) obtains the maximum number of repetitions N of the SR.
- the wireless connection with the base station is out of synchronization state due to wireless channel fluctuations or cross-carrier data transmission of the NB-IoT terminal.
- the terminal In the out-of-synchronization state, the terminal has uplink data to send, and the terminal triggers the SR in the connected state.
- S302 The terminal has continuously sent the nth SR, and is performing n+1 SR.
- S303 The SR sent by the terminal triggers Msg1, which triggers subsequent Msg2 and Msg3 scheduling by the base station.
- S304 Obtain the scheduling data and data stream of the base station Msg2, and obtain the signal-to-noise ratio of the downlink channel.
- S305 The continuous transmission count n obtained in S302, the duration of the start position of Msg2 NPDCCH and the end position of Msg1 obtained in S303 and S304, the n+1th time is recorded as X(n+1), the historical average of these n+1 times The value is Delay0.
- the duration between the start position of Msg2 NPDCCH and the start position of Msg2 NPDSCH, the n+1th time is denoted as Y(n+1), and the historical average value of these n+1 times is Delay1.
- the duration between the start position of Msg3 and the end position of Msg2 PDSCH, the n+1th time is denoted as Z(n+1), and the historical average of these n+1 times is Delay2.
- the average measurement value of the downlink channel signal-to-noise ratio during the n+1 transmission process is obtained.
- the connected state SR is triggered.
- S403 The connected state SR triggers Msg1, which triggers subsequent Msg2 and Msg3 scheduling of the base station.
- S404 Obtain the scheduling data and data stream of the base station Msg2, and obtain the signal-to-noise ratio of the downlink channel.
- S405 Calculate that Delay0 corresponding to the current fourth transmission of SR is 40, Delay1 is 32, and Delay2 is 32, and it is assumed that the signal-to-noise ratio of the downlink channel has jumped.
- FIG. 5 includes the following steps.
- the connected state SR is triggered.
- S503 The connected state SR triggers Msg1, which triggers the subsequent Msg2 and Msg3 scheduling of the base station.
- S504 Obtain the scheduling data and data stream of the base station Msg2, and obtain the signal-to-noise ratio of the downlink channel.
- the connected state SR is triggered.
- S603 The connected state SR triggers Msg1, which triggers the subsequent Msg2 and Msg3 scheduling of the base station.
- S604 Obtain the scheduling data and data stream of the base station Msg2, and obtain the signal-to-noise ratio of the downlink channel.
- the NB-IoT terminal obtains the maximum number of repetitions of the SR according to the system message, where CEL0 is 10 times and CEL1 is 8 times.
- the connected state SR is triggered.
- S703 The connected state SR triggers Msg1, which triggers subsequent Msg2 and Msg3 scheduling of the base station.
- S704 Obtain the scheduling data and data stream of the base station Msg2, and obtain the signal-to-noise ratio of the downlink channel.
- the terminal equipped with the uplink authorization request control device After the terminal equipped with the uplink authorization request control device provided in this implementation sends an SR request to the base station, it can flexibly determine that it is currently in an out-of-synchronization state and can stop sending SR to the base station, without having to wait until the number of sending SR requests reaches the maximum. It stops only when the number of repetitions is N, so the resource utilization of the base station side and the terminal side can be improved, and the service processing efficiency of NB-IoT can be improved.
- This embodiment also provides a terminal, as shown in FIG. 8, which includes a processor 801, a memory 802, and a communication bus 803; the communication bus 803 is used to implement a communication connection between the processor 801 and the memory 802.
- the processor 801 may be used to execute a computer program stored in the memory 802 to implement the steps of the uplink authorization request control method in the above embodiments.
- This embodiment also provides a computer-readable storage medium, which is included in any method or technology for storing information (such as computer-readable instructions, data structures, computer program modules, or other data). Volatile or non-volatile, removable or non-removable media.
- Computer-readable storage media include but are not limited to RAM (Random Access Memory), ROM (Read-Only Memory, read-only memory), EEPROM (Electrically Erasable Programmable read only memory, charged Erasable Programmable Read-Only Memory) ), flash memory or other memory technology, CD-ROM (Compact Disc Read-Only Memory), digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, Or any other medium that can be used to store desired information and that can be accessed by a computer.
- the computer-readable storage medium in this embodiment can be used to store a computer program, and the computer program can be executed by a processor to implement the steps of the uplink authorization request control method in the above embodiments.
- This embodiment also provides a computer program (or computer software), which can be distributed on a computer-readable medium and executed by a computable device to implement the uplink authorization request control method shown in the above embodiments step. And in some cases, at least one of the steps shown or described may be executed in a different order from the order described in the above-mentioned embodiments.
- This embodiment also provides a computer program product, including a computer readable device, and any computer program as shown above is stored on the computer readable device.
- the computer-readable device in this embodiment may include the computer-readable storage medium as shown above.
- communication media usually contain computer-readable instructions, data structures, computer program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery medium. Therefore, the present invention is not limited to any specific combination of hardware and software.
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Claims (11)
- 一种上行授权请求控制方法,包括:向基站发送上行业务调度授权请求,并获取所述基站当前的性能参数;根据所述性能参数,确定当前满足切换条件时,且未收到所述上行业务调度授权请求的响应时,确定当前处于失步状态,停止向所述基站发送上行业务调度授权请求。
- 如权利要求1所述的上行授权请求控制方法,其中,所述切换条件包括以下至少之一:所述基站当前资源紧缺,下行信道质量当前未发生跳变,当前向所述基站连续发送上行业务调度授权请求的次数n等于预设第一切换次数阈值N1;所述基站当前资源不紧缺,下行信道质量当前未发生跳变,当前向所述基站连续发送上行业务调度授权请求的次数n等于预设第二切换次数阈值N2;下行信道质量当前发生跳变;所述N1小于上行业务调度授权请求最大重发次数N,所述N2小于所述N1。
- 如权利要求2所述的上行授权请求控制方法,其中,所述性能参数包括:上行调度响应参数和下行调度响应参数中的至少一种;在检测到以下至少之一时,确定所述基站当前资源紧缺:所述性能参数包括上行调度响应参数时,该上行调度响应参数的值大于正常上行调度响应参数的值;所述性能参数包括下行调度响应参数时,该下行调度响应参数的值大于正常下行调度响应参数的值。
- 如权利要求3所述的上行授权请求控制方法,其中,所述性能参 数包括上行调度响应参数时,所述上行调度响应参数包括:第一上行调度响应延迟时间和第二上行调度响应延迟时间中的至少一种;所述第一上行调度响应延迟时间包括:当前n次发送上行业务调度授权请求时,前导接入阶段Msg1的响应阶段Msg2窄带物理下行控制信道开始位置与Msg1结束位置之间的平均时长;所述第二上行调度响应延迟时间包括:当前n次发送上行业务调度授权请求时,Msg2窄带物理下行控制信道开始位置与Msg2窄带物理下行共享信道起始位置之间的平均时长。
- 如权利要求3所述的上行授权请求控制方法,其中,所述下行调度响应参数包括:下行调度响应延迟时间;所述下行调度响应延迟时间包括:当前n次发送上行业务调度授权请求时,上行数据请求阶段Msg3开始位置与Msg2窄带物理下行共享信道结束位置之间的平均时长。
- 如权利要求2-5任一项所述的上行授权请求控制方法,其中,所述性能参数包括:下行信道质量指示参数;在检测到所述下行信道质量指示参数的值与正常下行信道质量指示参数的值之间的差值大于等于预设差阈值时,确定下行信道质量当前发生跳变。
- 如权利要求5所述的上行授权请求控制方法,其中,所述下行信道质量指示参数包括:当前n次发送上行业务调度授权请求时,测量得到的下行信道信噪比平均值。
- 如权利要求1-5任一项所述的上行授权请求控制方法,其中,所述确定当前处于失步状态时,还包括向所述基站重新发送接入请求。
- 一种上行授权请求控制装置,其中,包括:发送模块,用于向基站发送上行业务调度授权请求;获取模块,用于获取所述基站当前的性能参数;处理模块,用于根据所述性能参数,确定当前满足切换条件时,且未收到所述上行业务调度授权请求的响应时,确定当前处于失步状态,停止向所述基站发送上行业务调度授权请求。
- 一种终端,其中,包括处理器、存储器和通信总线;所述通信总线用于将所述处理器和存储器连接;所述处理器用于执行所述存储器中存储的计算机程序,以实现如权利要求1-8任一项所述的上行授权请求控制方法的步骤。
- 一种计算机可读存储介质,其中,所述计算机可读存储介质存储有计算机程序,所述计算机程序被处理器执行时,实现如权利要求1-8任一项所述的上行授权请求控制方法的步骤。
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