WO2020125538A1

WO2020125538A1 - Downlink base station selection method, apparatus and device, and storage medium

Info

Publication number: WO2020125538A1
Application number: PCT/CN2019/124823
Authority: WO
Inventors: 陈东杰; 王�华; 谢玖实; 李国银; 揭鸿
Original assignee: 阿里巴巴集团控股有限公司
Priority date: 2018-12-20
Filing date: 2019-12-12
Publication date: 2020-06-25
Also published as: CN111356210A; TW202044889A

Abstract

Provided are a downlink base station selection method, apparatus and device, and a storage medium. The method comprises: with regard to at least some base stations through which the same uplink message sent by a node passes, and at least based on signal quality data of the base stations in terms of sending the uplink message, ranking at least some base stations; and storing a ranking result in association with the node. On this basis, when it is necessary to send a downlink message to a node, according to a ranking result, the base station with the best performance can be selected as a downlink base station, so as to reduce the packet loss rate of a downlink data packet to the greatest possible extent.

Description

Downlink base station selection method, device, equipment and storage medium

This application requires the priority of the Chinese patent application submitted on December 20, 2018 with the application number 201811577929.5 and the invention titled "Downstream base station selection method, device, equipment and storage medium", the entire content of which is incorporated by reference in this application .

Technical field

The invention relates to the field of data communication, in particular to a method, device, equipment and storage medium for selecting a downlink base station.

Background technique

In LoRaWAN, when the terminal reports data, it will reach the NS through multiple base stations. These base stations are the base stations for the terminal to communicate with the NS in two directions. For terminals operating in ClassB or ClassC mode, NS can issue commands to control these terminals in near real-time or real-time. When the NS needs to issue a command to the terminal, it needs to select one of these base stations as a downlink base station. The channel quality between the downlink base station and the terminal directly affects the success rate of downlink data packets.

Summary of the invention

An object of the present invention is to provide a downlink base station selection scheme capable of selecting a base station with the best performance for a terminal.

According to the first aspect of the present invention, a method for selecting a downlink base station is provided, which includes: targeting at least a part of base stations through which a node sends the same uplink message, based at least on the signal quality data of the uplink message sent by the base station, Perform sorting; save the sorting results in association with the nodes.

Optionally, the step of sorting at least a part of the base stations includes: based on the signal quality data and the historical signal quality average data determined when the previous node sent the uplink message through the base station, determine the current signal quality average data of the base station; based on the current signal The size of the quality average data ranks at least part of the base stations.

Optionally, the step of determining the current signal quality average data of the base station includes: weighting and summing the signal quality data and the historical signal quality average data to obtain the current signal quality average data of the base station, wherein the first weight of the signal quality data It is proportional to the time interval between the two most recently received uplink messages sent by the node through the base station, and the second weight of the average historical signal quality data is inversely proportional to the time interval between the two most recently received nodes sent through the base station.

Optionally, the sum of the first weight and the second weight is 1.

Optionally, the signal quality data includes the signal strength and/or signal-to-noise ratio when the uplink message is received by the base station.

According to the second aspect of the present invention, there is also provided a method for selecting a downlink base station, which includes: in a case where a downlink message needs to be sent to a node, according to a sorting result corresponding to the node, a method for sending a downlink message to the node is selected The downlink base station, wherein the sorting result is obtained by sorting at least a part of the base stations through which the node sends the uplink message according to the signal quality data of the uplink message sent by the base station.

Optionally, the step of selecting a downlink base station for sending a downlink message to the node includes: based on the sorting result, selecting the first base station whose base station status is online and whose load is less than a predetermined threshold as the downlink base station.

Optionally, the sorting result is obtained by sorting at least part of the base stations according to the size of the current signal quality average data of the base station, and the step of selecting a downlink base station for sending a downlink message to the node includes: averaging the current signal quality of the base station The data and the load are given different weights respectively; the current signal quality average data of the base station and the load are weighted and summed to obtain the score of the base station; the base station with the highest score is selected from at least some base stations as the downlink base station.

According to a third aspect of the present invention, there is also provided a method for selecting a downlink base station, comprising: in response to receiving an uplink message sent by a node through the base station, for at least part of the base stations through which the node sends the uplink message, at least based on the base station Send the signal quality data of the upstream message to sort at least part of the base stations; store the sorting result in association with the node; when the downlink message needs to be sent to the node, choose to send to the node according to the sorting result corresponding to the node The downlink base station of the downlink message.

According to the fourth aspect of the present invention, there is also provided a downlink base station selection apparatus, comprising: a sorting module for at least a part of base stations through which a node sends the same uplink message, based at least on the signal quality of the uplink message sent by the base station The data sorts at least part of the base stations; the storage module is used to store the sorting results in association with the nodes.

According to a fifth aspect of the present invention, there is also provided a downlink base station selection apparatus, including: a selection module for selecting a node for sending to a node according to a sorting result corresponding to the node when a downlink message needs to be sent to the node The downlink base station sending the downlink message, wherein the sorting result is obtained by sorting at least part of the base stations through which the node sends the uplink message according to the signal quality data of the uplink message sent by the base station.

According to a sixth aspect of the present invention, there is also provided a downlink base station selection apparatus, including: a sorting module, configured to target at least a part of base stations through which a node sends the same uplink message, based at least on the signal quality of the uplink message sent by the base station Data to sort at least part of the base stations; a storage module to store the sorting result in association with the node; and a selection module to select the use according to the sorting result corresponding to the node when a downlink message needs to be sent to the node For a downlink base station that sends a downlink message to a node.

According to a seventh aspect of the present invention, there is also provided a computing device, including: a processor; and a memory, on which executable code is stored, and when the executable code is executed by the processor, the processor is executed as in the present invention The method described in any one of the first aspect to the third aspect.

According to the eighth aspect of the present invention, a non-transitory machine-readable storage medium is also provided, on which executable code is stored, and when the executable code is executed by the processor of the electronic device, the processor is executed as The method described in any one of the first to third aspects of the invention.

The present invention sorts the reachable base stations of the nodes according to the performance ranking. When a downlink message needs to be sent to the node, the base station with the best performance can be selected as the downlink base station according to the sorting result, thereby reducing the loss of downlink data packets to the greatest extent possible Package rate.

BRIEF DESCRIPTION

The above and other objects, features, and advantages of the present disclosure will become more apparent by describing the exemplary embodiments of the present disclosure in more detail in conjunction with the accompanying drawings. Among the exemplary embodiments of the present disclosure, the same reference numerals generally represent The same parts.

FIG. 1 shows a schematic flowchart of a method for selecting a downlink base station according to an embodiment of the present invention;

Figure 2 shows a schematic diagram of the effect after processing using a moving average algorithm;

FIG. 3 shows a schematic flowchart of a method for selecting a downlink base station according to another embodiment of the present invention;

4 shows a schematic flowchart of a downlink base station selection process according to an embodiment of the present invention;

5 shows a schematic block diagram of a structure of a downlink base station selection apparatus according to an embodiment of the present invention;

6 shows a schematic block diagram of a structure of a downlink base station selection apparatus according to another embodiment of the present invention;

7 shows a schematic block diagram of a structure of a downlink base station selection apparatus according to another embodiment of the present invention;

FIG. 8 shows a schematic structural diagram of a computing device according to an embodiment of the present invention.

detailed description

Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the drawings show preferred embodiments of the present disclosure, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

【Term Explanation】

LoRa: A low-power long-distance wireless transmission scheme based on spread spectrum technology.

LoRaWAN: A low-power wide area network (LPWAN) standard based on the open source MAC layer protocol launched by the LoRa Alliance. This technology can provide a low-power, scalable long-distance wireless network for battery-powered wireless devices.

NS: Network Server, network server, is the core part of the Internet of Things solution-core network.

Base station: gateway, which transmits the wireless network signal of the node to the NS equipment through the backhaul network.

Reachable base station: the base station through which the node sends the uplink message.

Rxpk: uplink message, that is, the data message uploaded by the base station to the NS.

Txpk: downlink message, that is, the data message that the NS downlinks to the base station.

tmst: base station internal counter.

Rssi: The signal strength when the node data packet is received by the base station.

Snr: The signal-to-noise ratio when the node data packet is received by the base station.

rxdelay: The delay time for the node to open the rx1 window after sending the upstream data packet.

EUI: The device unique identification code is a globally unique ID similar to IEEE EUI64, which is equivalent to the MAC address of the device.

gwEui: The unique identification code of the base station.

[Scenario Overview]

The downlink receiving window of the node working in ClassB mode is opened regularly, and the downlink receiving window of the node working in ClassC mode is always open. Therefore, under ClassB and ClassC, the requirement for the selection scheme of the downlink base station is to select the best performance Base stations have lower delay requirements.

The present invention proposes a downlink base station selection scheme suitable for ClassB or ClassC mode. The reachable base stations of a node can be sorted according to performance. When a downlink message needs to be sent to a node, the best performing base station can be selected according to the sorting result. Downlink base station to reduce the packet loss rate of downlink data packets as much as possible.

The downlink base station selection scheme of the present invention is mainly divided into two parts. The first part is the real-time update and pre-sequencing of the node reachable base station, and the second part is the selection of the downlink base station. Among them, the first part and the second part can be executed concurrently without affecting each other. In practice, they can be handled by two system processes respectively. The implementation principles of these two parts are explained below.

The first part is mainly to take out at least part of the base stations through which the node sends the uplink message, and then sort based on predetermined rules, and save the sorting result. The second part is mainly to select the base station with the best performance as the downlink according to the sorting result saved in advance for the node when there is a downlink message to be sent to the node (for example, after the downlink message processing (such as encapsulation) is completed) Base station.

The following further describes various aspects related to the present invention.

[Sequencing of base stations]

FIG. 1 shows a schematic flowchart of a method for selecting a downlink base station according to an embodiment of the present invention. Among them, the method shown in FIG. 1 may be performed by a network server (NS).

Referring to FIG. 1, in step S110, at least a part of the base stations through which the node sends the same uplink message is sorted based on at least a part of the base station's signal quality data of the uplink message sent by the base station.

The same uplink message sent by a node (that is, a terminal) can be uploaded to a network server through one or more base stations. Thus, for one uplink message sent by the node, the network server can receive multiple repeated uplink messages. In the present invention, base station information (eg, gwEUI, Rssi, Snr) of at least some base stations (such as all base stations) through which a node sends the same uplink message can be collected, and at least based on the signal quality data of the uplink message sent by the base station To sort these base stations.

As an example, the base station information of the base station through which the node sends the same uplink message can be collected by acquiring a lock. For example, you can set up a lock service for upstream packets. After acquiring the upstream packets sent by the node to the base station, you can try to acquire the lock. If the lock acquisition succeeds, it indicates that the upstream packet was received for the first time. Queue and add the base station information of the base station to the queue. If the lock acquisition fails, it indicates that the node has arrived first via the packet sent by the other base station. The upstream packet received this time is not the first time received. The base station information is added to the corresponding queue. Therefore, after a delay, all base stations through which the node sends the same uplink message can be obtained. In practice, a delay queue can be used to achieve asynchronous delay without blocking the current thread and improve the system throughput rate.

After obtaining the base station information of at least some base stations (for example, all base stations) through which the node sends the uplink message this time, at least based on the signal quality data of the uplink message sent by the base station, these base stations can be sorted according to various calculation rules. Among them, the sorting result can indicate the quality of the link between the base station and the node. The following is only an exemplary description of several feasible sorting methods. It should be known that the present invention can also use other statistical methods to sort the base stations.

Sorting method 1:

The current signal quality average data of the base station may be determined based on the signal quality data and historical signal quality average data. Then, the at least some base stations are sorted according to the size of the current signal quality average data. The signal quality data mentioned here refers to the signal quality data of the currently received upstream message, for example, it may include signal strength (Rssi) and/or signal-to-noise ratio (Snr). The historical average signal quality data refers to the average signal quality data determined when the previous node sent the uplink message through the base station, for example, it may be the average signal quality data determined when the last node sent the uplink message through the base station.

As an example, the signal quality data and historical signal quality average data may be weighted and summed to obtain the current signal quality average data of the base station. When the signal quality data and the historical signal quality average data are weighted and summed, the first weight corresponding to the signal quality data and the second weight corresponding to the historical signal quality average data may be set according to actual conditions.

Optionally, the first weight of the signal quality data is proportional to the time interval between the two most recently received uplink messages sent by the node through the base station, and the second weight of the average signal quality data of the historical signal is two The time interval of the second upstream packet is inversely proportional. Therefore, when the time interval between the two upstream packets sent by the node through the base station recently is relatively large, the first weight is larger and the second weight is smaller, indicating that the average signal quality of the current signal quality of the base station is affected by the current signal quality of the base station The impact of the data is greater, and the historical data quality average data is less. When the time interval between receiving two upstream packets sent by the node through the base station recently is small, the first weight is small and the second weight is large, indicating that the current signal quality average data of the base station is more affected by the current signal quality data of the base station Small, greatly affected by the average data of historical signal quality. In this way, the current average signal quality data of the base station finally obtained can reflect the current signal level of the base station more accurately and stably.

Alternatively, the sum of the first weight and the second weight may be 1. For example, the current signal quality average data of the base station can be calculated by the following formula: S(t)=a*y(t)+(1-a)*S(t-1). Where S(t) represents the current average signal quality data of the base station. y(t) represents the received signal quality data of the uplink message currently sent by the base station. S(t-1) represents the historical signal quality average data determined when the node sent the uplink message through the base station last time. a is the slip factor, which is proportional to the time interval between the two most recent uplink messages sent by the node through the base station. As an example, a can be confirmed by the following formula:

Where alpha is the scaling factor, t is the current time when the node receives the uplink message sent by the base station, and t_last is the last time it received the base station rxpk, the meaning of this formula is that when the node is recently received through the base station When the time interval between the two uplink messages sent is small, a is closer to 0, indicating that the current signal quality average data is closer to the historical value (historical signal quality average data), and the current value (the signal quality of the uplink message currently sent by the base station) Data) has little effect on the current average signal quality data; when the time interval between the two upstream packets recently sent by the node through the base station is relatively large, a is closer to 1, indicating that the current average signal quality data and the current value ( The signal quality data of the uplink message currently sent by the base station is relatively close, and the historical value (average data of historical signal quality) has little effect on the current average signal quality data.

Therefore, for a node with a short reporting period, it can be considered that the channel quality between the base station and the node will not change drastically during this period, so the sliding factor is small, and the sliding average (current signal quality average data) is subject to historical values. (Average data of historical signal quality) has a greater impact, and the moving average curve changes relatively smoothly. For a node with a long reporting period, it can be considered that the channel quality between the base station and the node may have a large change during this period, so the moving average (current signal quality average data) is affected by the current value (the uplink message currently sent by the base station) Signal quality data) has a greater impact.

The signal quality data may include the signal strength (Rssi) and/or signal-to-noise ratio (Snr) when the uplink message is received by the base station. Therefore, the current signal quality average data may also include current signal strength and/or current signal-to-noise ratio average data, which may be recorded as Rssi′ and Snr′, respectively. For the calculation process of the signal strength indicator and/or the signal-to-noise ratio indicator, reference may be made to the relevant description above, which will not be repeated here.

It should be noted that when sorting according to the calculated Rssi′ and Snr′, the sorting rule may be to divide Snr′, for example, according to (-10, 0), (0, 10)... Base stations with Snr' in the same grade can be sorted by comparing Rssi', and base stations with Snr' not in the same grade are compared with Snr'.

As shown in Figure 2, the ordinate represents the signal reception strength. Line 1 is the actual Rssi curve of a node passing through a base station, and the jitter is relatively large. Line 2 is a series of sliding averages calculated based on the above method. Gentle, when sorting based on the results characterized by line 2, the robustness of the sorting results can be improved.

Sorting method 2:

Different weights may also be given to the signal quality data of multiple upstream packets sent by the node through each base station. Optionally, the size of the weight is proportional to the time when the corresponding uplink message sent by the base station is received, that is, the closer the time when the uplink message of the base station is received to the current time, the greater the weight, otherwise the smaller. Then, the signal quality index of the base station for the node may be obtained by weighted summation and averaging, and then at least part of the base stations may be sorted according to the size of the signal quality index.

The signal quality data may include the signal strength (Rssi) and/or signal-to-noise ratio (Snr) when the uplink message is received by the base station. Therefore, the signal quality indicator may also include a signal strength indicator and/or a signal-to-noise ratio indicator, which may be recorded as Rssi′ and Snr′, respectively. The signal strength index may be determined based on the signal strength of one or more uplink packets sent by the node through the base station, and the signal-to-noise ratio index may be determined based on the signal-to-noise ratio of one or more uplink packets sent by the node through the base station. of. For the calculation process of the signal strength indicator and/or the signal-to-noise ratio indicator, reference may be made to the relevant description above, which will not be repeated here.

In step S120, the sorting result is stored in association with the node.

The sorting result can be regarded as the sorting result for the current reachable base station of the node. Therefore, the sorting result can be stored in association with the node. As an example, the sorting result can be stored in the routing table of the node.

[Selection of downlink base stations]

FIG. 3 shows a schematic flowchart of a method for selecting a downlink base station according to another embodiment of the present invention. Among them, the method shown in FIG. 3 may be performed by a network server (NS).

As shown in FIG. 3, in response to receiving the uplink message sent by the node through the base station, steps S111 to S116 may be performed. Among them, step S111 to step S116 are mainly real-time update and pre-sequencing of the reachable base station of the node, that is, taking out at least part of the base stations through which the node sends the uplink message, and then sorting based on a predetermined rule, and saving the sorting result. For details of steps S111 to S116, reference may be made to the description above in conjunction with FIG. 1, and only the process shown in FIG. 3 will be exemplarily described here.

Referring to FIG. 3, in step S111, a distributed lock is requested. If the lock acquisition is successful, go to step S112, otherwise go to step S113.

In step S113, the lock acquisition fails, indicating that the node arrives first via the packets of other base stations, and adds the base station information of the current base station (such as gwEUI, Rssi, Snr) to the corresponding queue.

In step S112, the successful acquisition of the lock indicates that the node has arrived first via the message of the current base station, and the base station information of the current base station (such as gwEUI, Rssi, Snr) is added to the queue.

In step S114, delay processing is performed. Delay for a period of time, waiting for the packets passing through other base stations to arrive. In practice, a delay queue can be used to achieve asynchronous delay without blocking the current thread and improve the system throughput rate.

In step S115, after the delay ends, all base stations through which the upstream message of the current node has passed are taken out and sorted according to a certain rule. For the sorting algorithm, please refer to the description above in conjunction with FIG. 1, which will not be repeated here.

In step S116, the sorting result is saved, for example, the sorting result can be stored in the routing table.

As shown by the dotted box in FIG. 3, when there is a downlink message to be delivered to the node, step S210 may be performed to select a downlink base station. The downlink base station used to send the downlink message to the node may be selected according to the sorting result for the node saved in advance. For example, the base station with the highest ranking may be selected as the downlink base station.

As an example, when selecting a downlink base station based on the sorting result, it can also be determined whether the status of the base station is online and whether the load of the base station is excessive. For example, based on the sorting result, the first base station whose base station status is online and whose load is less than a predetermined threshold may be selected as the downlink base station. In addition, the current signal quality average data of the base station and the load may be given different weights respectively, and then the current signal quality average data of the base station and the load may be weighted and summed to obtain the score of the base station, and the score may be selected from at least some base stations The base station with the largest value serves as the downlink base station.

FIG. 4 shows a schematic flowchart of a downlink base station selection process according to an embodiment of the present invention.

Referring to FIG. 4, in step S311, in response to receiving the downlink instruction, step S312 may be executed to determine whether the node is operating in ClassB mode or ClassC mode. If the node's operating mode is not ClassB mode or ClassC mode, the downlink base station of ClassA may be used The selection flow is processed. The present invention does not limit the selection flow of the class A downlink base station.

If the working mode of the node is ClassB mode or ClassC mode, step S313 may be executed to assemble the downlink message. After the downlink message is assembled, step S314 may be executed to obtain the pre-sorted base station for the node, for example, the sorting result may be obtained from the routing table. Optionally, the base station with the highest ranking may be selected according to the ranking result.

In step S315, the base station status and load of the selected base station are acquired.

In step S316, it is determined whether the base station is online, and whether the load of the base station is greater than a predetermined threshold. If it is determined that the base station is online and the load of the base station is less than a predetermined threshold, step 317 is executed, and the selected base station may be used as a downlink base station, and a downlink message is sent to the base station.

If it is determined that the base station is not online, or the load of the base station is greater than a predetermined threshold, it may return to step S314 to be re-selected according to the sorting result, and reselect the top-ranking base station.

The downlink base station selection scheme of the present invention has at least the following beneficial effects.

1. The selection of the downlink base station and the de-coupling of the rearrangement of the uplink message to ensure that the node can reach the base station in real time.

2. When sorting the base stations, the current signal quality average data obtained based on the dynamic factor exponential sliding algorithm can be used for pre-sorting, which has the following advantages.

Real-time: ensure that the current average signal quality data (Rssi and/or Snr) obtained by sequencing closely follows the change trend of actual values, and can sense and adjust the sequencing results in real time when the channel quality deteriorates.

High robustness: Do not rely on single signal quality data to ensure the stability of sorting results.

High adaptability: adapt to nodes with different reporting periods. For nodes with a shorter reporting period, it can be considered that the channel quality will not change drastically during this period, so the sliding factor is small, the sliding average is greatly affected by the historical value, and the sliding average curve changes relatively smoothly. For a node with a long reporting period, it can be considered that the channel quality may change greatly during this period, so the moving average is greatly affected by the current value.

Low storage space: only need to save the latest average signal quality data, historical signal quality data does not need to be saved, saving storage space.

3. Comprehensively consider the real-time online status and real-time load of the base station. The LoRaWAN network is a typical ALOHA system. According to the ALOHA system theory: the larger the system load, the larger the packet collision rate, thereby reducing the success rate of downlink data packets. Therefore, the present invention can also filter out the load when selecting the actual downlink base station Base stations that exceed a certain threshold.

[Downlink base station selection device]

5 to 7 are schematic block diagrams showing the structure of a downlink base station selection apparatus according to different embodiments of the present invention. The functional module of the downlink base station selection device may be implemented by hardware, software, or a combination of hardware and software that implements the principles of the present invention. Those skilled in the art can understand that the functional modules described in FIGS. 5 to 7 can be combined or divided into sub-modules, so as to implement the principles of the above invention. Therefore, the description herein can support any possible combination, division, or further definition of the functional modules described herein.

The functional modules that the downlink base station selection device may have and the operations that each functional module can perform are briefly described. For the details involved, please refer to the description above, which will not be repeated here.

Referring to FIG. 5, in this embodiment, the downlink base station selection apparatus 500 includes a sorting module 510 and a saving module 520.

The sorting module 510 is configured to sort at least part of the base stations based on at least some base stations through which the node sends the same uplink message based at least on the signal quality data of the uplink messages sent by the base station. The saving module 520 is used to store the sorting result in association with the node.

As an example, the sorting module 510 may include a determination module and a sorting submodule, the determination module is used to determine the current average signal quality of the base station based on the signal quality data and the historical average signal quality data determined when the previous node sent the uplink message through the base station data. The sorting sub-module is used to sort at least part of the base stations according to the size of the current signal quality average data.

Optionally, the determination module may perform weighted summation on the signal quality data and the historical signal quality average data to obtain the current signal quality average data of the base station. Among them, the first weight of the signal quality data is directly proportional to the time interval between the two most recently received upstream packets sent by the node through the base station, and the second weight of the average signal quality data of the historical signal is the last two uplinks sent by the node through the base station The time interval of the message is inversely proportional. Optionally, the sum of the first weight and the second weight is 1.

Referring to FIG. 6, in this embodiment, the downlink base station selection device 600 includes a selection module 610.

The selection module 610 is used to select a downlink base station for sending a downlink message to the node according to the sorting result corresponding to the node when a downlink message needs to be sent to the node, wherein the sorting result is a signal for sending an uplink message according to the base station The quality data is obtained by sorting at least part of the base stations through which the node sends the uplink message. For the method of obtaining the sorting result, please refer to the related description above, which will not be repeated here.

As an example of the present invention, the selection module 610 may select the first base station whose base station status is online and whose load is less than a predetermined threshold as the downlink base station based on the sorting result.

As another example of the present invention, the sorting result may be obtained by sorting at least part of the base stations according to the size of the current signal quality average data of the base station, and the selection module 610 may assign different values to the current signal quality average data and load of the base station Weighting, weighting and summing the current signal quality average data and load of the base station to obtain the score of the base station, and selecting the base station with the highest score from at least some base stations as the downlink base station.

Referring to FIG. 7, in this embodiment, the downlink base station selection apparatus 700 includes a sorting module 710, a saving module 720, and a selection module 730.

The sorting module 710 is configured to sort at least some base stations based on at least some base stations through which the node sends the same uplink message based at least on the signal quality data of the uplink messages sent by the base station. The saving module 720 is used to store the sorting result in association with the node. The selection module 730 is used to select a downlink base station for sending a downlink message to the node according to the sorting result corresponding to the node when the downlink message needs to be sent to the node.

For the operations that the sorting module 710 and the saving module 720 can perform, refer to the description in FIG. 5, and details are not described here.

For the operations that can be performed by the selection module 730, refer to the description in FIG.

【Computer equipment】

FIG. 8 shows a schematic structural diagram of a computing device that can be used to implement the foregoing downlink base station selection method according to an embodiment of the present invention.

Referring to FIG. 8, the computing device 800 includes a memory 810 and a processor 820.

The processor 820 may be a multi-core processor, or may include multiple processors. In some embodiments, the processor 820 may include a general-purpose main processor and one or more special coprocessors, such as a graphics processor (GPU), a digital signal processor (DSP), and so on. In some embodiments, the processor 820 may be implemented using a customized circuit, such as an application specific integrated circuit (ASIC, Application Integrated Circuit) or a field programmable logic gate array (FPGA, Field Programmable Gate Arrays).

The memory 810 may include various types of storage units, such as system memory, read-only memory (ROM), and permanent storage devices. The ROM may store static data or instructions required by the processor 820 or other modules of the computer. The permanent storage device may be a readable and writable storage device. The permanent storage device may be a non-volatile storage device that does not lose stored instructions and data even after the computer is powered off. In some embodiments, the permanent storage device uses a mass storage device (eg, magnetic or optical disk, flash memory) as the permanent storage device. In some other embodiments, the permanent storage device may be a removable storage device (for example, a floppy disk or an optical drive). The system memory may be a readable and writable storage device or a volatile readable and writable storage device, such as dynamic random access memory. The system memory can store some or all instructions and data required by the processor during operation. In addition, the memory 810 may include any combination of computer-readable storage media, including various types of semiconductor memory chips (DRAM, SRAM, SDRAM, flash memory, programmable read-only memory), magnetic disks, and/or optical disks may also be used. In some embodiments, the memory 810 may include readable and/or writeable removable storage devices, such as compact discs (CDs), read-only digital versatile discs (eg, DVD-ROM, dual-layer DVD-ROM), Read-only Blu-ray discs, ultra-density discs, flash memory cards (such as SD cards, min SD cards, Micro-SD cards, etc.), magnetic floppy disks, etc. The computer-readable storage medium does not contain carrier waves and instantaneous electronic signals transmitted through wireless or wired.

Executable code is stored on the memory 810. When the executable code is processed by the processor 820, the processor 820 may be caused to perform the downlink base station selection method mentioned above.

The downlink base station selection method, apparatus, and computing device according to the present disclosure have been described in detail above with reference to the drawings.

In addition, the method according to the present disclosure may also be implemented as a computer program or computer program product including computer program code instructions for performing the above steps defined in the above-described method of the present disclosure.

Alternatively, the present disclosure may also be implemented as a non-transitory machine-readable storage medium (or computer-readable storage medium, or machine-readable storage medium) on which executable code (or computer program, or computer instruction code) is stored ), when the executable code (or computer program, or computer instruction code) is executed by the processor of the electronic device (or computing device, server, etc.), the processor is caused to perform each step of the above method according to the present invention .

Those skilled in the art will also understand that the various exemplary logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or a combination of both.

The flowchart and block diagrams in the drawings show the possible implementation architecture, functions, and operations of systems and methods according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, program segment, or part of code that contains one or more of the Executable instructions. It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can also be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts, can be implemented with dedicated hardware-based systems that perform specified functions or operations Or, it can be realized by a combination of dedicated hardware and computer instructions.

The embodiments of the present disclosure have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments. The selection of terms used herein is intended to best explain the principle, practical application or improvement of the technology in the embodiments of the embodiments, or to enable other ordinary persons skilled in the art to understand the embodiments disclosed herein.

Claims

A method for selecting a downlink base station, which includes:

For at least part of the base stations through which the node sends the same uplink message, at least based on the signal quality data of the uplink message sent by the base station, sort the at least some base stations;

The sorting result is stored in association with the node.
The method for selecting a downlink base station according to claim 1, wherein the step of sorting at least part of the base stations includes:

Determine the current signal quality average data of the base station based on the signal quality data and the historical average signal quality data determined when the node previously sent the uplink message through the base station;

Sort the at least some base stations according to the size of the current average signal quality data.
The method for selecting a downlink base station according to claim 2, wherein the step of determining the average data of the current signal quality of the base station comprises:

Weighting and summing the signal quality data and the historical average signal quality data to obtain the current average signal quality data of the base station,

Wherein, the first weight of the signal quality data is proportional to the time interval between the two most recent received uplink messages sent by the node through the base station, and the second weight of the average data of historical signal quality is recently received The time interval between two uplink messages sent by the node through the base station is inversely proportional.
The method for selecting a downlink base station according to claim 3, wherein the sum of the first weight and the second weight is 1.
The method for selecting a downlink base station according to claim 1, wherein the signal quality data includes a signal strength and/or a signal-to-noise ratio when the uplink packet is received by the base station.
A method for selecting a downlink base station, which includes:

In the case where a downlink message needs to be sent to a node, a downlink base station used to send the downlink message to the node is selected according to the sorting result corresponding to the node, where the sorting result is to send an uplink report according to the base station The signal quality data of the message is obtained by sorting at least part of the base stations through which the node sends the uplink message.
The method for selecting a downlink base station according to claim 6, wherein the step of selecting a downlink base station for sending the downlink message to the node comprises:

Based on the sorting result, the first base station whose base station status is online and whose load is less than a predetermined threshold is selected as the downlink base station.
The method for selecting a downlink base station according to claim 6, wherein the sorting result is obtained by sorting the at least some base stations according to the size of the current signal quality average data of the base station, and the selection is used to The step of the downlink base station sending the downlink message to the node includes:

Give different weights to the current signal quality average data and load of the base station, respectively;

Weighting and summing the current signal quality average data and load of the base station to obtain the score of the base station;

A base station with the highest score is selected from the at least some base stations as the downlink base station.
A method for selecting a downlink base station, which includes:

In response to receiving the uplink message sent by the node through the base station, for at least part of the base stations through which the node sends the uplink message, at least based on the signal quality data of the uplink message sent by the base station, the Sort;

Store the sorting result in association with the node;

When a downlink message needs to be sent to the node, according to the sorting result corresponding to the node, a downlink base station used to send the downlink message to the node is selected.
A downlink base station selection device, characterized in that it includes:

A sorting module, configured to sort at least part of the base stations based on at least a part of the base stations through which the node sends the same uplink message, based at least on the signal quality data of the uplink messages sent by the base station;

The saving module is used to store the sorting result in association with the node.
A downlink base station selection device, characterized in that it includes:

The selection module is used to select a downlink base station for sending the downlink message to the node according to the sorting result corresponding to the node when a downlink message needs to be sent to the node, wherein the sorting result is According to the signal quality data of the uplink message sent by the base station, at least part of the base stations through which the node sends the uplink message are sorted.
A downlink base station selection device, characterized in that it includes:

A sorting module, configured to sort at least part of the base stations based on at least a part of the base stations through which the node sends the same uplink message, based at least on the signal quality data of the uplink messages sent by the base station;

A saving module for storing the sorting result in association with the node; and

The selection module is used to select a downlink base station for sending the downlink message to the node according to the sorting result corresponding to the node when the downlink message needs to be sent to the node.
A computing device, including:

Processor; and

A memory on which executable code is stored, and when the executable code is executed by the processor, causes the processor to perform the method according to any one of claims 1 to 9.
A non-transitory machine-readable storage medium having executable code stored thereon, when the executable code is executed by a processor of an electronic device, the processor is caused to execute any one of claims 1 to 9. The method.