CN111669838B - PCF access method and device suitable for satellite-to-ground WI-FI network - Google Patents
PCF access method and device suitable for satellite-to-ground WI-FI network Download PDFInfo
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- CN111669838B CN111669838B CN202010462443.8A CN202010462443A CN111669838B CN 111669838 B CN111669838 B CN 111669838B CN 202010462443 A CN202010462443 A CN 202010462443A CN 111669838 B CN111669838 B CN 111669838B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/04—Scheduled or contention-free access
- H04W74/06—Scheduled or contention-free access using polling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Abstract
The application discloses a PCF access method and a device suitable for a satellite-to-ground WI-FI network, wherein the method comprises the following steps: calculating a waiting time delay interval of polling of adjacent terminals according to a preset satellite orbit height and a preset half-wave beam angle of an antenna, and setting an initial priority and serial number information of each terminal in a preset terminal polling list; polling the services of the terminals in the terminal polling list within a waiting time delay interval according to the number of the preset primary polling terminals and the serial number information to obtain a polling result; adjusting the initial priority of each terminal according to the polling result, and adjusting the terminal polling list and the number of the initial polling terminals according to the adjusted priority; and polling is carried out again according to the adjusted terminal polling list and the adjusted number of the polling terminals until the polling times reach the preset polling times. The method and the device solve the technical problem that throughput performance of the satellite-ground WI-FI network is low in the prior art.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a PCF access method and apparatus applicable to a satellite-to-ground WI-FI network.
Background
Wireless networking technology (WI-FI) is increasingly widely applied to the field of communication by virtue of the advantages of strong flexibility, good mobility, low cost and the like, and more devices supporting the WI-FI are provided. However, currently, the coverage of the device supporting WI-FI is limited, the network deployment is greatly influenced by the environment, many areas are not covered by wireless signals, and satellite communication has the characteristics of large coverage and no influence of the geographic environment. Many people propose to combine and apply satellite communication and WI-FI technology to obtain a satellite-ground WI-FI network, and the satellite-ground WI-FI network configures WI-FI hotspots into various special environments by using low-orbit satellites to realize wide-area coverage of WI-FI signals.
At present, the commercial WI-FI on the ground mostly adopts the IEEE 802.11 standard, the media access control layer mainly adopts a Distributed Coordination Function (DCF) mechanism, which is affected by the earth curvature and the terminal direction antenna, the DCF mechanism cannot perform inter-terminal carrier sensing, and the satellite-ground link in the satellite-ground WI-FI network has the characteristics of propagation time extension, large influence of empty frame polling, and the like.
Disclosure of Invention
The technical problem that this application solved is: in the scheme provided by the embodiment of the application, the wireless access point polls the terminal service, adjusts the priority of terminal polling according to a polling result, namely a service result, and eliminates the terminal with smaller service from the polling, so that more frequent polling of a high-load terminal is ensured, the waste of empty frame polling of a low-load terminal is reduced, and the throughput performance of the system is further improved.
In a first aspect, an embodiment of the present application provides a PCF access method applicable to a satellite-to-ground WI-FI network, where the method includes:
calculating a waiting time delay interval of polling of adjacent terminals according to a preset satellite orbit height and a preset half-wave beam angle of an antenna, and setting an initial priority and serial number information of each terminal in a preset terminal polling list, wherein the terminal polling list comprises at least one terminal;
polling the services of the terminals in the terminal polling list in the waiting time delay interval according to the number of the preset primary polling terminals and the serial number information to obtain a terminal polling result of the primary polling;
Adjusting the initial priority of each terminal according to the terminal polling result, and adjusting the terminal polling list and the number of the primary polling terminals according to the adjusted priority to obtain the adjusted terminal polling list and the adjusted number of the polling terminals;
and polling is carried out again according to the adjusted terminal polling list and the adjusted number of the polling terminals until the polling times reach the preset polling times.
In the scheme that this application embodiment provided, wireless access point is through in waiting time interval, according to the first polling terminal figure of presetting and sequence number information is right terminal in the terminal polling list polls, obtains the terminal polling result of first polling, then according to terminal polling result adjusts every the initial priority of terminal is adjusted according to the priority adjustment after the adjustment terminal polling list with first polling terminal figure obtains the terminal polling list after the adjustment and the polling terminal figure after the adjustment, at last according to the terminal polling list after the adjustment and polling terminal figure after the adjustment polls again, and until the number of polls reaches preset polling number. Therefore, in the scheme provided by the embodiment of the application, the wireless access point polls the terminal service, adjusts the priority of terminal polling according to the polling result, namely the service volume result, and eliminates the terminal with smaller service volume from the polling, so that more frequent polling of the high-load terminal is ensured, the waste of polling the empty frame of the low-load terminal is reduced, and the system throughput performance is improved.
Optionally, calculating a polling wait time delay interval of the adjacent terminal according to a preset satellite orbit height and a preset half-wave beam angle of the antenna, including:
calculating an earth semi-central angle corresponding to the satellite coverage area according to the satellite orbit height and the antenna half-wave beam angle, and calculating a transmission distance between the satellite and a terminal according to the earth semi-central angle;
and calculating the satellite-ground link propagation delay according to the transmission distance, and calculating the waiting delay interval according to the satellite-ground link propagation delay.
Optionally, calculating an earth semi-central angle corresponding to the satellite coverage area according to the satellite orbit height and the antenna half-wave beam angle, and calculating a transmission distance between the satellite and the terminal according to the earth semi-central angle, including:
calculating the earth semi-center angle according to the following formula:
wherein α represents the earth semi-center angle; theta represents the half-wave beam angle of the antenna; h represents the satellite orbital altitude; re represents the earth radius;
calculating the transmission distance according to the following formula:
wherein d represents the transmission distance.
Optionally, calculating a satellite-to-ground link propagation delay according to the transmission distance, and calculating the waiting delay interval according to the satellite-to-ground link propagation delay includes:
Calculating the satellite-ground link propagation delay according to the following formula:
wherein, the PropTime represents the satellite-to-ground link propagation delay; c represents the electromagnetic wave propagation speed;
calculating the latency interval according to the following formula:
TIFS＝2*PropTime+PIFS
wherein TIFS represents the latency interval; PIFS denotes a preset dot frame time interval.
Optionally, setting the initial priority and the sequence number information of each terminal in a preset terminal polling list includes:
setting the initial priorities of all terminals in the terminal polling list to be the same;
and randomly setting a serial number for each terminal in the terminal polling list, wherein the serial numbers of all terminals in the terminal polling list are continuous.
Optionally, polling the service of the terminal in the terminal polling list within the waiting time delay interval according to a preset number of the initial polling terminals and the sequence number information to obtain a terminal polling result of the initial polling, including:
determining the serial number of the at least one terminal according to the serial number information, and sequencing the at least one terminal according to the sequence of the serial numbers from small to large to obtain a terminal sequence;
starting from a first terminal in the terminal sequence, judging whether a data frame sent by a current terminal is received in the waiting time delay interval, if so, determining that the polling result of the current terminal is the received data frame; otherwise, the polling result is that the data frame is not received;
And sequentially judging whether a next terminal sends a data frame or not in the waiting time delay interval according to the terminal sequence, and obtaining a polling result of the next terminal until the judged number of terminals reaches the number of the initial polling terminals.
Optionally, adjusting the initial priority of each terminal according to the terminal polling result includes:
if the terminal polling result is a received data frame, subtracting 1 from the initial priority of the terminal corresponding to the terminal polling result; or
And if the terminal polling result is that the data frame is not received, adding 1 to the initial priority of the terminal corresponding to the terminal polling result.
Optionally, adjusting the terminal polling list and the number of the initial polling terminals according to the adjusted priority to obtain an adjusted terminal polling list and an adjusted number of polling terminals, including:
determining a first terminal with the maximum priority and the number of the first terminals according to the adjusted priority;
deleting the first terminal from the terminal polling list to obtain the adjusted terminal polling list;
and subtracting the number of the first terminals from the number of the initial polling terminals to obtain the adjusted number of the polling terminals.
In a second aspect, the present application provides a PCF access apparatus adapted to a star-to-ground WI-FI network, the apparatus comprising:
the system comprises a calculation unit, a data processing unit and a data processing unit, wherein the calculation unit is used for calculating a waiting time delay interval of polling of adjacent terminals according to a preset satellite orbit height and a preset half-wave beam angle of an antenna, and setting an initial priority and serial number information of each terminal in a preset terminal polling list, wherein the terminal polling list comprises at least one terminal;
the first polling unit is used for polling the services of the terminals in the terminal polling list in the waiting time delay interval according to the preset number of the primary polling terminals and the serial number information to obtain a terminal polling result of the primary polling;
the adjusting unit is used for adjusting the initial priority of each terminal according to the terminal polling result, adjusting the terminal polling list and the number of the primary polling terminals according to the adjusted priority, and obtaining the adjusted terminal polling list and the adjusted number of the polling terminals;
and the second polling unit is used for polling again according to the adjusted terminal polling list and the adjusted polling terminal number until the polling frequency reaches the preset polling frequency.
Optionally, the computing unit is specifically configured to:
calculating an earth semi-central angle corresponding to the satellite coverage area according to the satellite orbit height and the antenna half-wave beam angle, and calculating a transmission distance between the satellite and a terminal according to the earth semi-central angle;
and calculating the satellite-ground link propagation delay according to the transmission distance, and calculating the waiting delay interval according to the satellite-ground link propagation delay.
Optionally, the computing unit is specifically configured to:
calculating the earth semi-center angle according to the following formula:
wherein α represents the earth semi-center angle; theta represents the half-wave beam angle of the antenna; h represents the satellite orbital altitude; re represents the earth radius;
calculating the transmission distance according to the following formula:
wherein d represents the transmission distance.
Optionally, the computing unit is specifically configured to:
calculating the satellite-ground link propagation delay according to the following formula:
wherein, the PropTime represents the satellite-to-ground link propagation delay; c represents the electromagnetic wave propagation speed;
calculating the latency interval according to the following formula:
TIFS＝2*PropTime+PIFS
wherein TIFS represents the latency interval; PIFS denotes a preset dot frame time interval.
Optionally, the calculating unit is specifically configured to set an initial priority and sequence number information of each terminal in a preset terminal polling list, and includes:
setting the initial priorities of all terminals in the terminal polling list to be the same;
and randomly setting a serial number for each terminal in the terminal polling list, wherein the serial numbers of all terminals in the terminal polling list are continuous.
Optionally, the first polling unit is specifically configured to:
determining the serial number of the at least one terminal according to the serial number information, and sequencing the at least one terminal according to the sequence of the serial numbers from small to large to obtain a terminal sequence;
starting from a first terminal in the terminal sequence, judging whether a data frame sent by a current terminal is received in the waiting time delay interval, if so, determining that the polling result of the current terminal is the received data frame; otherwise, the polling result is that the data frame is not received;
and sequentially judging whether a next terminal sends a data frame or not in the waiting time delay interval according to the terminal sequence, and obtaining a polling result of the next terminal until the judged number of terminals reaches the number of the initial polling terminals.
Optionally, the adjusting unit is specifically configured to:
if the terminal polling result is a received data frame, subtracting 1 from the initial priority of the terminal corresponding to the terminal polling result; or
And if the terminal polling result is that the data frame is not received, adding 1 to the initial priority of the terminal corresponding to the terminal polling result.
Optionally, the adjusting unit is specifically configured to:
determining a first terminal with the maximum priority and the number of the first terminals according to the adjusted priority;
deleting the first terminal from the terminal polling list to obtain the adjusted terminal polling list;
and subtracting the number of the first terminals from the number of the initial polling terminals to obtain the adjusted number of the polling terminals.
In a third aspect, the present application provides a wireless access point, comprising:
a memory for storing instructions for execution by at least one processor;
a processor for executing instructions stored in a memory to perform the method of the first aspect.
In a fourth aspect, the present application provides a computer readable storage medium having stored thereon computer instructions which, when run on a computer, cause the computer to perform the method of the first aspect.
Drawings
Fig. 1 is a schematic structural diagram of a system suitable for PCF access in a satellite-to-ground WI-FI network according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating a PCF access method applicable to a satellite-to-ground WI-FI network according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a PCF access apparatus suitable for a satellite-to-ground WI-FI network according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a wireless access point according to an embodiment of the present disclosure.
Detailed Description
In order to better understand the technical solutions, the technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
Referring to fig. 1, an embodiment of the present application provides a system suitable for PCF Access of a satellite-to-ground WI-FI network, where the system includes a wireless Access Point 1(Access Point, AP) and at least one terminal 2 connected to the wireless Access Point 1; the wireless access point 1 and at least one terminal 2 carry out data interaction through a satellite-ground WI-FI network. In the solution provided in the embodiment of the present application, at least one terminal 2 connected to a wireless access Point 1 performs communication by using a Point Coordination Function (PCF)
The PCF access method applicable to the star-to-ground WI-FI network provided in the embodiments of the present application is further described in detail below with reference to the drawings of the specification, and a specific implementation manner of the method may include the following steps (a method flow is shown in fig. 2):
step 201, calculating a waiting time delay interval of polling of adjacent terminals according to a preset satellite orbit height and a preset half-wave beam angle of an antenna, and setting an initial priority and serial number information of each terminal in a preset terminal polling list, wherein the terminal polling list comprises at least one terminal.
In the scheme provided by the embodiment of the application, after the communication connection is established between the terminal and the wireless access point, the wireless access point stores the terminal information connected with the wireless access point into the database and forms a preset terminal polling list, wherein the terminal polling list comprises information of all terminals connected with the wireless access point. The wireless access point can acquire the preset satellite orbit height and the preset antenna half-wave beam angle from the satellite-ground network and store the satellite orbit height and the antenna half-wave beam angle in the database.
When at least one terminal performs a data transmission service with a wireless access point, the wireless access point needs to calculate a waiting delay interval for polling of an adjacent terminal according to a preset satellite orbit height and a preset half-wave beam angle of an antenna, and specifically, there are various ways for the wireless access point to calculate the waiting delay interval for polling of the adjacent terminal.
In one possible implementation manner, calculating a waiting delay interval for polling of an adjacent terminal according to a preset satellite orbit height and a preset half-wave beam angle of an antenna includes:
calculating an earth semi-central angle corresponding to the satellite coverage area according to the satellite orbit height and the antenna half-wave beam angle, and calculating a transmission distance between the satellite and a terminal according to the earth semi-central angle;
and calculating the satellite-ground link propagation delay according to the transmission distance, and calculating the waiting delay interval according to the satellite-ground link propagation delay.
Further, in a possible implementation manner, calculating an earth semi-central angle corresponding to the satellite coverage area according to the satellite orbit height and the antenna half-wave beam angle, and calculating a transmission distance between the satellite and a terminal according to the earth semi-central angle includes:
calculating the earth semi-center angle according to the following formula:
wherein α represents the earth semi-center angle; theta represents the half-wave beam angle of the antenna; h represents the satellite orbital altitude; re represents the earth radius;
calculating the transmission distance according to the following formula:
wherein d represents the transmission distance.
Further, in a possible implementation manner, calculating a satellite-to-ground link propagation delay according to the transmission distance, and calculating the waiting delay interval according to the satellite-to-ground link propagation delay includes:
Calculating the satellite-ground link propagation delay according to the following formula:
wherein, the PropTime represents the satellite-to-ground link propagation delay; c represents the electromagnetic wave propagation speed;
calculating the latency interval according to the following formula:
TIFS＝2*PropTime+PIFS
wherein TIFS represents the latency interval; PIFS denotes a preset dot frame time interval.
Further, in order to poll a plurality of terminals in the preset terminal polling list, the wireless access point needs to perform initialization setting on the terminals in the terminal polling list, specifically, there are a plurality of ways for the wireless access point to perform initialization setting, and a preferred way is described as an example below.
In one possible implementation manner, setting the initial priority and the sequence number information of each terminal in the preset terminal polling list includes: setting the initial priorities of all terminals in the terminal polling list to be the same; and randomly setting a serial number for each terminal in the terminal polling list, wherein the serial numbers of all terminals in the terminal polling list are continuous.
Step 202, polling the services of the terminals in the terminal polling list in the waiting time delay interval according to the number of the preset primary polling terminals and the sequence number information to obtain a terminal polling result of the primary polling.
In the solution provided in the embodiment of the present application, after the wireless access point calculates the waiting delay interval for polling of the neighboring terminals and sets the initial priorities and sequence numbers of all the terminals in the polling list, it needs to poll the terminals in the polling list. Specifically, there are various ways for the radio access point to poll the terminals in the polling list, and a preferred example is described below.
In a possible implementation manner, polling the services of the terminals in the terminal polling table within the waiting time delay interval according to a preset number of the initial polling terminals and the sequence number information to obtain a terminal polling result of the initial polling, including:
determining the serial number of the at least one terminal according to the serial number information, and sequencing the at least one terminal according to the sequence of the serial numbers from small to large to obtain a terminal sequence;
starting from a first terminal in the terminal sequence, judging whether a data frame sent by a current terminal is received in the waiting time delay interval, if so, determining that the polling result of the current terminal is the received data frame; otherwise, the polling result is that no data frame is received;
And sequentially judging whether a next terminal sends a data frame or not in the waiting time delay interval according to the terminal sequence, and obtaining a polling result of the next terminal until the judged number of terminals reaches the number of the initial polling terminals.
For example, if the terminal polling list includes 10 terminals, the number of the preset initial polling terminals is 10. Firstly, setting a serial number for each of the 10 terminals, wherein the serial numbers are 1, 2, … and 10 respectively; and then, sequencing 10 terminals according to the sequence of the sequence numbers from small to large to obtain a terminal sequence, starting from the terminal with the sequence number of 1, judging whether a data frame sent by the terminal with the sequence number of 1 is received or not in a waiting time delay interval, if so, determining that a polling result corresponding to the terminal with the sequence number of 1 is a received data frame, otherwise, determining that the polling result is that the data frame is not received.
Further, whether a data frame sent by a terminal with the sequence number of 2 is received or not is judged within the waiting time delay interval, if so, the polling result corresponding to the terminal with the sequence number of 2 is the received data frame, otherwise, the polling result is that the data frame is not received; and then, judging whether a data frame sent by the terminal with the sequence number of 3 is received or not in the waiting time delay interval, if so, judging that the polling result corresponding to the terminal with the sequence number of 3 is the received data frame, otherwise, judging that the data frame is not received, and ending the polling until the terminal with the sequence number of 10 is judged.
Step 203, adjusting the initial priority of each terminal according to the terminal polling result, and adjusting the terminal polling list and the number of the initial polling terminals according to the adjusted priority to obtain the adjusted terminal polling list and the adjusted number of the polling terminals.
In the functional scheme provided by the embodiment of the application, after a polling is finished, the wireless access point adjusts the priority of the terminal in the terminal polling list according to the polling result. Specifically, there are various ways to adjust the priority of the terminal in the terminal polling list, and a preferred way is described as an example below.
In one possible implementation manner, adjusting the initial priority of each terminal according to the terminal polling result includes: if the terminal polling result is a received data frame, subtracting 1 from the initial priority of the terminal corresponding to the terminal polling result; or if the terminal polling result is that the data frame is not received, adding 1 to the initial priority of the terminal corresponding to the terminal polling result.
Further, after adjusting the priority of the terminal in the terminal polling list, the wireless access point determines the first terminal with the highest priority in the terminal polling list according to the adjusted priority, and adjusts the terminal polling list and the initial polling terminal number according to the first terminal. Specifically, there are various ways to adjust the terminal polling list and the number of initial polling terminals, and a preferred way is described as an example below.
In a possible implementation manner, adjusting the terminal polling list and the number of the initial polling terminals according to the adjusted priority to obtain an adjusted terminal polling list and an adjusted number of polling terminals includes: determining a first terminal with the maximum priority and the number of the first terminals according to the adjusted priority; deleting the first terminal from the terminal polling list to obtain the adjusted terminal polling list; and subtracting the number of the first terminals from the number of the initial polling terminals to obtain the adjusted number of the polling terminals.
And 204, polling is performed again according to the adjusted terminal polling list and the adjusted polling terminal number until the polling frequency reaches the preset polling frequency.
To facilitate understanding of the polling procedure of the wireless access point, a brief description of the procedure is provided below.
For example, suppose that the number of terminals in the terminal polling list is M, the terminal serial number is i, the priority corresponding to the terminal i is P (i), Period represents the total cycle number of the current polling, Round represents the number of terminals that need to be polled in the current cycle, P0 represents the number of polled cycles, R0 represents the number of polled nodes in the current cycle, where M is a positive integer not less than 1, and i is greater than or equal to 1 and less than or equal to M. Specifically, the radio access polling procedure is as follows:
Step 1, initialization: setting the priority of each terminal to be initialized to 1, and sequentially storing the priority in a polling list. The terminal serial number i is initialized to 1, Period is initialized to 1, Round is initialized to M, and P0 and R0 are both initialized to 0.
And 2, the access point AP polls the terminal serial number i in the polling list. If the access point receives a data frame sent by a terminal with a terminal sequence number i in a waiting time interval, subtracting 1 from the priority of the terminal, namely P (i) -1; if the access point does not receive the data frame transmitted by the terminal with the terminal sequence number i in the waiting time interval, the priority of the data frame is added with 1, namely P (i) ═ P (i) + 1.
And 3, updating the R0 and the value of i. R0 ═ R0+1, i ═ i + 1.
Step 4, if R0 is smaller than Round, jumping to step 2; otherwise, add 1 to P0, and update Round value, Round-numpr (max), where numpr (max) indicates the number of terminals with the highest priority, and set R0 to 0 and i to 1.
Step 5, if the P0 is less than Period, jumping to step 2; otherwise, updating the polling list according to the priority, namely sequentially arranging the priority from high to low, and updating Period to be the number of the priority types in the polling list.
In the scheme that this application embodiment provided, wireless access point is through in waiting time interval, according to the first polling terminal figure of presetting and sequence number information is right terminal in the terminal polling list polls, obtains the terminal polling result of first polling, then according to terminal polling result adjusts every the initial priority of terminal is adjusted according to the priority adjustment after the adjustment terminal polling list with first polling terminal figure obtains the terminal polling list after the adjustment and the polling terminal figure after the adjustment, at last according to the terminal polling list after the adjustment and polling terminal figure after the adjustment polls again, and until the number of polls reaches preset polling number. Therefore, in the scheme provided by the embodiment of the application, the wireless access point polls the terminal service, adjusts the priority of terminal polling according to the polling result, namely the service volume result, and eliminates the terminal with smaller service volume from the polling, so that more frequent polling of the high-load terminal is ensured, the waste of polling the empty frame of the low-load terminal is reduced, and the system throughput performance is improved.
Based on the same inventive concept as the method described in fig. 2, an embodiment of the present application provides a PCF access apparatus suitable for a star-to-ground WI-FI network, and referring to fig. 3, the apparatus includes:
a calculating unit 301, configured to calculate a waiting delay interval for polling adjacent terminals according to a preset satellite orbit height and a preset half-wave beam angle of an antenna, and set an initial priority and sequence number information of each terminal in a preset terminal polling list, where the terminal polling list includes at least one terminal;
a first polling unit 302, configured to poll services of terminals in the terminal polling list within the waiting time delay interval according to a preset number of primary polling terminals and the sequence number information, so as to obtain a terminal polling result of the primary polling;
an adjusting unit 303, configured to adjust an initial priority of each terminal according to the terminal polling result, and adjust the terminal polling list and the number of the primary polling terminals according to the adjusted priority, to obtain an adjusted terminal polling list and an adjusted number of polling terminals;
a second polling unit 304, configured to perform polling again according to the adjusted terminal polling list and the adjusted number of polling terminals until the polling frequency reaches the preset polling frequency.
Optionally, the computing unit 301 is specifically configured to:
calculating an earth semi-central angle corresponding to the satellite coverage area according to the satellite orbit height and the antenna half-wave beam angle, and calculating a transmission distance between the satellite and a terminal according to the earth semi-central angle;
and calculating the satellite-ground link propagation delay according to the transmission distance, and calculating the waiting delay interval according to the satellite-ground link propagation delay.
Optionally, the calculating unit 301 is specifically configured to:
calculating the earth semi-center angle according to the following formula:
wherein α represents the earth semi-center angle; theta represents the half-wave beam angle of the antenna; h represents the satellite orbital altitude; re represents the earth radius;
calculating the transmission distance according to the following formula:
wherein d represents the transmission distance.
Optionally, the calculating unit 301 is specifically configured to:
calculating the satellite-ground link propagation delay according to the following formula:
wherein, the PropTime represents the satellite-to-ground link propagation delay; c represents the electromagnetic wave propagation speed;
calculating the latency interval according to the following formula:
TIFS＝2*PropTime+PIFS
wherein TIFS represents the latency interval; PIFS denotes a preset dot frame time interval.
Optionally, the calculating unit 301 is specifically configured to set an initial priority and sequence number information of each terminal in a preset terminal polling list, and includes:
setting the initial priorities of all terminals in the terminal polling list to be the same;
and randomly setting a serial number for each terminal in the terminal polling list, wherein the serial numbers of all terminals in the terminal polling list are continuous.
Optionally, the first polling unit 302 is specifically configured to:
determining the serial number of the at least one terminal according to the serial number information, and sequencing the at least one terminal according to the sequence of the serial numbers from small to large to obtain a terminal sequence;
starting from a first terminal in the terminal sequence, judging whether a data frame sent by a current terminal is received in the waiting time delay interval, if so, determining that the polling result of the current terminal is the received data frame; otherwise, the polling result is that the data frame is not received;
and sequentially judging whether a next terminal sends a data frame or not in the waiting time delay interval according to the terminal sequence, and obtaining a polling result of the next terminal until the judged number of terminals reaches the number of the initial polling terminals.
Optionally, the adjusting unit 303 is specifically configured to:
if the terminal polling result is a received data frame, subtracting 1 from the initial priority of the terminal corresponding to the terminal polling result; or
And if the terminal polling result is that the data frame is not received, adding 1 to the initial priority of the terminal corresponding to the terminal polling result.
Optionally, the adjusting unit 303 is specifically configured to:
determining a first terminal with the maximum priority and the number of the first terminals according to the adjusted priority;
deleting the first terminal from the terminal polling list to obtain the adjusted terminal polling list;
and subtracting the number of the first terminals from the number of the initial polling terminals to obtain the adjusted number of the polling terminals.
Referring to fig. 4, the present application provides a wireless access point, comprising:
a memory 401 for storing instructions for execution by at least one processor;
a processor 402 for executing instructions stored in memory to perform the method described in fig. 2.
A computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of fig. 2.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (6)
1. A PCF access method suitable for a satellite-to-ground WI-FI network is characterized by comprising the following steps:
calculating a waiting time delay interval of polling of adjacent terminals according to a preset satellite orbit height and a preset half-wave beam angle of an antenna, and setting an initial priority and serial number information of each terminal in a preset terminal polling list, wherein the terminal polling list comprises at least one terminal;
polling the services of the terminals in the terminal polling list in the waiting time delay interval according to the preset number of the primary polling terminals and the serial number information to obtain a terminal polling result of the primary polling;
adjusting the initial priority of each terminal according to the terminal polling result, and adjusting the terminal polling list and the number of the primary polling terminals according to the adjusted priority to obtain an adjusted terminal polling list and an adjusted number of the polling terminals;
polling is carried out again according to the adjusted terminal polling list and the adjusted number of the polling terminals until the polling times reach the preset polling times;
calculating the polling waiting time delay interval of the adjacent terminal according to the preset satellite orbit height and the preset half-wave beam angle of the antenna, wherein the method comprises the following steps:
Calculating an earth semi-central angle corresponding to the satellite coverage area according to the satellite orbit height and the antenna half-wave beam angle, and calculating a transmission distance between the satellite and a terminal according to the earth semi-central angle;
calculating the satellite-ground link propagation delay according to the transmission distance, and calculating the waiting delay interval according to the satellite-ground link propagation delay;
calculating an earth semi-central angle corresponding to the satellite coverage area according to the satellite orbit height and the antenna half-wave beam angle, and calculating a transmission distance between the satellite and a terminal according to the earth semi-central angle, wherein the method comprises the following steps:
calculating the earth semi-center angle according to the following formula:
wherein α represents the earth semi-center angle; theta represents the half-wave beam angle of the antenna; h represents the satellite orbital altitude; re represents the earth radius;
calculating the transmission distance according to the following formula:
wherein d represents the transmission distance;
calculating the satellite-ground link propagation delay according to the transmission distance, and calculating the waiting delay interval according to the satellite-ground link propagation delay, wherein the method comprises the following steps:
calculating the satellite-ground link propagation delay according to the following formula:
wherein, the PropTime represents the satellite-to-ground link propagation delay; c represents the electromagnetic wave propagation speed;
Calculating the latency interval according to the following formula:
TIFS＝2*PropTime+PIFS
wherein TIFS represents the waiting delay interval; PIFS denotes a preset dot frame time interval.
2. The method of claim 1, wherein setting the initial priority and sequence number information of each terminal in a preset terminal polling list comprises:
setting the initial priorities of all terminals in the terminal polling list to be the same;
and randomly setting a serial number for each terminal in the terminal polling list, wherein the serial numbers of all terminals in the terminal polling list are continuous.
3. The method of claim 2, wherein polling the services of the terminals in the terminal polling list within the waiting delay interval according to a preset number of the initially polled terminals and the sequence number information to obtain the terminal polling result of the initial polling comprises:
determining the serial number of the at least one terminal according to the serial number information, and sequencing the at least one terminal according to the sequence of the serial numbers from small to large to obtain a terminal sequence;
starting from a first terminal in the terminal sequence, judging whether a data frame sent by a current terminal is received in the waiting time delay interval, if so, determining that the polling result of the current terminal is the received data frame; otherwise, the polling result is that the data frame is not received;
And sequentially judging whether a next terminal sends a data frame or not in the waiting time delay interval according to the terminal sequence, and obtaining a polling result of the next terminal until the judged number of terminals reaches the number of the initial polling terminals.
4. The method of claim 3, wherein adjusting the initial priority of each of the terminals according to the terminal polling results comprises:
if the terminal polling result is a received data frame, subtracting 1 from the initial priority of the terminal corresponding to the terminal polling result; or
And if the terminal polling result is that the data frame is not received, adding 1 to the initial priority of the terminal corresponding to the terminal polling result.
5. The method of claim 1, wherein adjusting the terminal polling list and the number of initial polling terminals according to the adjusted priority to obtain an adjusted terminal polling list and an adjusted number of polling terminals comprises:
determining a first terminal with the maximum priority and the number of the first terminals according to the adjusted priority;
deleting the first terminal from the terminal polling list to obtain the adjusted terminal polling list;
And subtracting the number of the first terminals from the number of the initial polling terminals to obtain the adjusted number of the polling terminals.
6. A PCF access arrangement adapted for use in a satellite-to-ground WI-FI network, comprising:
the system comprises a calculation unit, a data processing unit and a data processing unit, wherein the calculation unit is used for calculating a waiting time delay interval of polling of adjacent terminals according to a preset satellite orbit height and a preset half-wave beam angle of an antenna, and setting an initial priority and serial number information of each terminal in a preset terminal polling list, wherein the terminal polling list comprises at least one terminal;
the first polling unit is used for polling the services of the terminals in the terminal polling list within the waiting time delay interval according to the preset number of the primary polling terminals and the serial number information to obtain a terminal polling result of the primary polling;
the adjusting unit is used for adjusting the initial priority of each terminal according to the terminal polling result, adjusting the terminal polling list and the number of the primary polling terminals according to the adjusted priority, and obtaining the adjusted terminal polling list and the adjusted number of the polling terminals;
the second polling unit is used for polling again according to the adjusted terminal polling list and the adjusted number of the polling terminals until the polling times reach the preset polling times;
The computing unit is specifically configured to:
calculating an earth semi-central angle corresponding to the satellite coverage area according to the satellite orbit height and the antenna half-wave beam angle, and calculating a transmission distance between the satellite and a terminal according to the earth semi-central angle;
calculating the satellite-ground link propagation delay according to the transmission distance, and calculating the waiting delay interval according to the satellite-ground link propagation delay;
calculating the earth semi-center angle according to the following formula:
wherein α represents the earth semi-center angle; theta represents the half-wave beam angle of the antenna; h represents the satellite orbital altitude; re represents the earth radius;
calculating the transmission distance according to the following formula:
wherein d represents the transmission distance;
calculating the waiting delay interval according to the satellite-ground link propagation delay, comprising:
calculating the satellite-ground link propagation delay according to the following formula:
wherein, the PropTime represents the satellite-to-ground link propagation delay; c represents the electromagnetic wave propagation speed;
calculating the latency interval according to the following formula:
TIFS＝2*PropTime+PIFS
wherein TIFS represents the latency interval; PIFS denotes a preset dot frame time interval.
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| KR20190058132A (en) * | 2017-11-21 | 2019-05-29 | 에이치피프린팅코리아 유한회사 | Response delay time determination to maintain long polling connection |
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