CN114401549A - Beacon frame optimization method, device and equipment under dual-mode system - Google Patents
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Abstract
The invention relates to the technical field of dual-mode communication, and provides a method, a device and equipment for optimizing a beacon frame in a dual-mode system. The dual-mode system adopts HPLC and HRF dual-mode networking, the beacon period of the beacon frame comprises adjacent beacon time slots and CSMA time slots, and identification bits for identifying the boundary positions of the beacon time slots and the CSMA time slots, wherein the beacon frame optimization method under the dual-mode system comprises the following steps: determining that a beacon frame on the HRF link needs to occupy the CSMA time slot for transmission; and updating the boundary position in the identification bit to enable the CSMA time slot to start a CSMA mode after the updated boundary position. The embodiment of the invention can improve the networking efficiency.
Description
Technical Field
The present invention relates to the technical field of dual-mode communication, and in particular, to a beacon frame optimization method in a dual-mode system, a beacon frame optimization apparatus in a dual-mode system, a beacon frame optimization device in a dual-mode system, and a storage medium.
Background
According to technical specification of dual-mode communication interconnection and interworking, for a transmission mode that a simplified frame on a wireless link needs to be transmitted on a CSMA time slot, a certain wireless node in a network transmits a wireless standard frame, occupies the transmission opportunity on a beacon time slot and can only transmit on the CSMA time slot. The CSMA time slot is a service sending time slot, nodes in the network seize a CSMA channel in a competition mode, and the simplified beacon frame and other services and network management messages seize the channel in the competition mode.
For service and network management messages, if the channel is not preempted in the current beacon period, the channel preemption can be postponed to the next beacon period. For the beacon frame, if the beacon slot on the CSMA slot is also used to acquire a transmission opportunity through contention as with other services and network management messages, if the contention fails, the reduced wireless beacon frame cannot be transmitted in the current beacon period. The following provisions in the protocol cannot be met at this time: the proxy station needs to send beacons every beacon period, even though the reduced frames on the wireless link also meet this requirement.
HPLC: (high Power Line Carrier) high speed Power Line Carrier;
HRF: (high speed Radio Frequency) high speed wireless communication.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a method, an apparatus, and a device for optimizing a beacon frame in a dual-mode system, so as to solve at least some of the above problems.
In order to achieve the above object, a first aspect of the present invention provides a beacon frame optimization method in a dual-mode system, where the dual-mode system employs an HPLC and HRF dual-mode networking, a beacon period of the beacon frame includes adjacent beacon slots and CSMA slots, and an identification bit identifying a boundary position of the beacon slots and the CSMA slots, and the method includes: determining that a beacon frame on the HRF link needs to occupy the CSMA time slot for transmission; and updating the boundary position in the identification bit to enable the CSMA time slot to start a CSMA mode after the updated boundary position.
Preferably, the determining that the beacon frame on the HRF link needs to occupy the CSMA slot for transmission includes: acquiring and analyzing a wireless beacon identification bit in an information field of a non-central beacon, and determining that the wireless beacon identification bit is a preset value; determining that the beacon frame needs to occupy the CSMA time slot for transmission.
Preferably, the beacon frame on the HRF link is determined to need to occupy the CSMA time slot for transmission, and the transmission time sequence of the node in the beacon period is determined according to the topological relation of the node in the dual-mode system; and judging whether a node which is occupied by the node for transmitting the standard frame beacon on the wireless link and transmits the simplified frame beacon on the wireless link exists, and if so, determining that the beacon frame needs to occupy the CSMA time slot for transmitting.
Preferably, the updating the boundary position in the identification bit includes: according to the number of beacon frames occupying the CSMA time slot and the sending time of each beacon frame; and determining the time length after the boundary position is moved.
Preferably, the boundary position and the updated boundary position are both expressed by using a time length, and the time length is a value of an RF beacon timeslot length in a beacon frame.
Preferably, the method further comprises: and updating and determining the following parameters according to the updated boundary position:
the CSMA slot start time is equal to the beacon period start time + the RF beacon slot length;
the CSMA slot effective length is equal to the beacon period length-RF beacon slot length.
Preferably, the time of the start of the CSMA slot and the effective length of the CSMA slot are included in a reduced beacon frame slot allocation entry.
Preferably, the beacon frame on the HRF link, which occupies the CSMA timeslot and is transmitted, is transmitted in a time division manner.
In a second aspect of the present invention, there is also provided a beacon frame optimization apparatus in a dual-mode system, applied to a dual-mode system using HPLC and HRF dual-mode networking, the apparatus including:
a determining module, configured to determine that a beacon frame on the HRF link needs to occupy the CSMA timeslot for transmission; and the updating module is used for updating the boundary position in the identification bit under the condition that the beacon frame on the HRF link is determined to occupy the CSMA time slot for sending, so that the CSMA time slot starts a CSMA mode after the updated boundary position.
In a third aspect of the present invention, there is also provided a beacon frame optimization device in a dual mode system, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the foregoing steps of the beacon frame optimization method in the dual mode system when executing the computer program.
In a fourth aspect of the present invention, there is also provided a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to perform the steps of the foregoing beacon frame optimization method in a dual-mode system.
A fifth aspect of the present invention provides a computer program product comprising a computer program which, when executed by a processor, implements the aforementioned method of beacon frame optimization in a dual mode system.
The technical scheme has the following beneficial effects: the simplified frame sent on the CSMA time slot does not need to occupy the channel with the service and the network management information in a competition mode, but is sent in a time division mode, so that the beacon frame can be sent out in the beacon period, the requirement for beacon sending in the specification is met, the networking efficiency is improved, and the nodes on the wireless link can access the network quickly.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a schematic diagram illustrating an implementation of a beacon frame optimization method in a dual-mode system according to an embodiment of the present invention;
FIG. 2 schematically illustrates a system topology diagram of an example first dual-mode system according to an embodiment of the invention;
fig. 3 schematically illustrates beacon slot partitioning prior to adjustment based on an example system in accordance with an embodiment of the present invention;
fig. 4 schematically illustrates an adjusted beacon slot partition diagram based on an example system in accordance with an embodiment of the present invention;
FIG. 5 schematically illustrates a system topology diagram of example two of a dual mode system according to an embodiment of the present invention;
fig. 6 schematically shows a beacon slot partitioning diagram based on an example system two in an embodiment of the present invention;
fig. 7 schematically shows a structural diagram of a beacon frame optimization apparatus in a dual-mode system according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
In a system adopting dual-mode networking of HPLC and HRF, multiple beacon slots need to be occupied for transmitting a standard beacon frame on an HRF channel, which means that a beacon frame on an HRF link needs to occupy the CSMA slot for transmission. The beacon period of the beacon frame comprises adjacent beacon time slots and CSMA time slots and identification bits for identifying boundary positions of the beacon time slots and the CSMA time slots. Fig. 1 schematically shows an implementation diagram of a beacon frame optimization method in a dual-mode system according to an embodiment of the present invention. As shown in fig. 1, the beacon frame optimization method in the dual-mode system according to the present embodiment is as follows:
s01, determining that the beacon frame on the HRF link needs to occupy the CSMA time slot for sending;
and S02, updating the boundary position in the identification bit, and enabling the CSMA time slot to start the CSMA mode after the updated boundary position.
Through the implementation mode, when the beacon frame is transmitted by adopting the CSMA time slot, the channel does not need to be preempted by adopting a competition mode, so that the problem that the beacon frame cannot be transmitted due to the fact that the preemption fails is avoided, and the transmission of the beacon frame in the beacon period is ensured.
In an embodiment provided by the present invention, the determining that a beacon frame on the HRF link needs to occupy the CSMA slot for transmission includes: acquiring and analyzing a wireless beacon identification bit in an information field of a non-central beacon, and determining that the wireless beacon identification bit is a preset value; determining that the beacon frame needs to occupy the CSMA time slot for transmission. Table 1 below shows a non-central beacon slot allocation entry, and it can be seen that when the wireless beacon flag is 4, it can be determined that it needs to transmit a beacon frame on the CSMA slot.
TABLE 1
It can be seen that according to the standard non-central beacon slot allocation entry, when the wireless beacon flag is 0x04, it is defined to transmit the HPLC beacon and the RF reduced beacon in the CSMA slot. Therefore, it can be determined whether the beacon frame on the HRF link needs to occupy the CSMA slot for transmission by resolving whether the flag bit is equal to 0x 04.
In one embodiment of the present invention, the preset values are defined as: and when the wireless beacon identification bit is a preset value, sending an HPLC beacon and sending an RF simplified beacon frame in a CSMA time slot. In the above embodiment, only the determination manner of the standard non-central beacon slot allocation entry is illustrated, and the determination may be performed by using 0x 04. However, in other cases, the preset value is not necessarily 0x04, and the preset value needs to be determined again by adopting the definition of the actual wireless beacon identification bit.
In addition to the determination made by the above embodiment, the determination can also be made by the topology of the dual mode system. Determining the sending time sequence of the nodes in the beacon period according to the topological relation of the nodes in the dual-mode system; and judging whether a node which is occupied by the node for transmitting the standard frame beacon on the wireless link and transmits the simplified frame beacon on the wireless link exists, and if so, determining that the beacon frame needs to occupy the CSMA time slot for transmitting. Fig. 2 schematically shows a system topology diagram of an example one of a dual mode system according to an embodiment of the present invention. The dashed lines in the figure represent the HRF link and the solid lines represent the HPLC link, and this arrangement will be followed in subsequent figures. In the grid system of the network topology shown in fig. 2, one wireless standard frame multiplexes 2 HPLC beacon slots. The beacon slot division is shown in fig. 3. Fig. 3 schematically illustrates beacon slot partitioning prior to adjustment based on an example system in accordance with an embodiment of the present invention. The proxy node 5 and the child node 8 only have wireless link HRF communication, so the node 5 needs to send a standard beacon frame on the wireless link, one wireless standard beacon frame multiplexes 2 HPLC standard beacon time slots, and the sending opportunity of the node 3 on the wireless link is occupied by the node 5, so the proxy node 3 and the STA station 9 send simplified beacon frames on the wireless link on the CSMA time slot, and at this time, the time slot may not be preempted.
Fig. 4 schematically illustrates an adjusted beacon slot partition diagram based on an example system according to an embodiment of the present invention, as shown in fig. 4. Beacon time slots arranged by a Central Coordinator (CCO) are sequentially transmitted on an HPLC link according to the sequence of a central beacon, agent beacons ( nodes 2, 5, 3, 4 and 8) and STA beacons ( nodes 6, 7 and 9), and on an HRF wireless link, because a node 5 transmits a standard beacon frame and multiplexes two HPLC beacon time slots, the nodes 3 and 9 need to transmit a simplified beacon frame on a CSMA time slot, and when the nodes transmit the simplified beacon frame of the node 3, the simplified beacon frame of the node 3 is transmitted first and then the simplified beacon frame of the node 9 is transmitted according to the sequence arranged by the Central Coordinator (CCO). At this time, the beacon slot and the CSMA slot need to be adjusted according to the method provided by the embodiment of the present invention, and the result of the adjustment is as follows: the total number of non-central beacon time slots in the network is 9, the number of the central beacon time slots is 3, the number of the central beacon time slots is three, and the number of the agent stations is 5, wherein the number of the agent stations is 2, 3, 4, 5 and 8. If the beacon period is 500ms and the length of each beacon slot is 10ms, the time length occupied by the actually effective beacon slot on the wireless link is 130ms, the HPLC link is 110ms, the effective start time of the CSMA slot which can actually send the service on the wireless link is 130ms, and the actual effective length is 370 ms.
In an embodiment provided by the present invention, the updating the boundary position in the identification bit includes: the number and the length of the wireless reduced frames occupying the CSMA time slot are determined according to the needs; and shifting the boundary position by the corresponding length. In the scheme, the starting time and the ending time of the beacon period of the HPLC link and the wireless link and the length of the beacon period are completely aligned, but two links are not completely aligned on the division of the beacon time slot and the CSMA time slot in the beacon period. The length of the RF beacon time slot indicates the length of the effective beacon time slot on the RF link, namely the length of the RF effective beacon time slot is longer than that of the beacon time slot of the HPLC link by N wireless reduced frames, and N is the number of 4 wireless beacon zone bits in the non-central beacon time slot allocation entry. The reduced beacon frame slot allocation entry field does not change, but the specific content definition filled in by the field needs to change.
And the boundary position and the updated boundary position are both expressed by adopting time length, and the time length is the value of the time slot length of the RF beacon in the beacon frame. The beacon frame here includes a standard beacon frame and a reduced beacon frame. In each of the above two beacon frames, there is a flag bit predefined by the communication specification, that is: RF beacon slot length. For example, in some specifications, the flag bit has a byte number of 18 and is represented by one byte.
The method further comprises the following steps: and updating and determining the following parameters according to the updated boundary position: CSMA time slot starting time and the effective length of the CSMA time slot; and updating and determining the following parameters according to the updated boundary position: CSMA time slot starting time and the effective length of the CSMA time slot; the CSMA slot start time is equal to the beacon period start time + the RF beacon slot length; the CSMA slot effective length is equal to the beacon period length-RF beacon slot length. Both of the above parameters are re-determined based on the updated demarcation location. The time slot allocation in the dual-mode system comprises the parameters which need to be correspondingly modified. Also taking the system in fig. 2 as an example: the effective start time of a CSMA slot on a wireless link, where traffic can actually be sent, is 130ms, and the effective length is 370 ms.
In one embodiment of the present invention, the time of the beginning of the CSMA slot and the effective length of the CSMA slot are included in a reduced beacon frame slot allocation entry, and table 2 below shows the modified reduced beacon frame slot allocation entry.
TABLE 2
In an embodiment provided by the present invention, the beacon frame on the HRF link that occupies the CSMA timeslot is sent in a time division manner. The beacon frame transmitted by occupying the CSMA time slot should keep consistent with the transmission mode of the beacon time slot, so the method is also carried out in a Time Division Mode (TDMA) mode to be beneficial to consistency in a dual-mode system.
In an embodiment provided by the present invention, fig. 5 schematically illustrates a system topology diagram of an example two of a dual-mode system according to an embodiment of the present invention, and in a tree-shaped internet of things system of the network topology diagram shown in fig. 5, one wireless beacon frame multiplexes 2 HPLC beacon timeslots. On a wireless link, because the nodes 2, 6, 12, 17 transmit standard beacon frames and multiplex two HPLC beacon time slots, the nodes 3, 8, 13, 7 transmit the simplified beacon frames on the CSMA time slots, and when transmitting, the simplified beacon frames of the node 3 are transmitted first and then the simplified beacon frames of the nodes 8, 13, 7 are transmitted according to the sequence arranged by a Central Coordinator (CCO).
Fig. 6 schematically shows a beacon slot partition diagram based on the second example system according to an embodiment of the present invention. As shown in fig. 6, the total number of non-central beacon slots in the network is 22, three central beacon slots are provided on each of the 3 lines, and the number of proxy stations is 11, including 2, 3, 4, 5, 6, 8, 12, 13, 14, 16, and 17. If the beacon period is 500ms and the length of each beacon slot is 10ms, the time length occupied by the actually effective beacon slot on the wireless link is 290ms, the HPLC link is 240ms, the effective start time of the CSMA slot which can actually send the service on the wireless link is 290ms, and the actual effective length is 210ms (500ms-290ms is 210 ms).
By adopting the above implementation mode, the simplified frame sent on the CSMA time slot does not need to compete with the service and the network management information to seize the channel, but is sent in a time division manner, so that the beacon frame can be sent out in the beacon period, the requirement of the specification on beacon sending is met, the networking efficiency is improved, and the nodes on the wireless link can access the network quickly.
Based on the same inventive concept, the invention also provides a beacon frame optimization device under the dual-mode system, which is applied to the dual-mode system adopting HPLC and HRF dual-mode networking. Fig. 7 is a schematic structural diagram illustrating a beacon frame optimization apparatus in a dual-mode system according to an embodiment of the present invention, as shown in fig. 7. The device includes:
a determining module, configured to determine that a beacon frame on the HRF link needs to occupy the CSMA timeslot for transmission; and the updating module is used for updating the boundary position in the identification bit under the condition that the beacon frame on the HRF link is determined to occupy the CSMA time slot for sending, so that the CSMA time slot starts a CSMA mode after the updated boundary position.
For the specific limitations of each functional module in the beacon frame optimization apparatus in the dual-mode system, reference may be made to the above limitations of the beacon frame optimization method in the dual-mode system, and details are not described here again. The various modules in the above-described apparatus may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In some embodiments provided by the present invention, there is also provided a beacon frame optimization device in a dual-mode system, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the foregoing steps of the beacon frame optimization method in the dual-mode system when executing the computer program. The processor herein has functions of numerical calculation and logical operation, and has at least a central processing unit CPU having data processing capability, a random access memory RAM, a read only memory ROM, various I/O ports, an interrupt system, and the like. The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be provided with one or more than one, and the method is realized by adjusting the kernel parameters. The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
In an embodiment of the present invention, there is also provided a computer-readable storage medium having stored therein instructions which, when executed on a computer, cause a processor to be configured to perform the above-mentioned beacon frame optimization method in a dual-mode system.
In one embodiment provided by the present invention, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the method for beacon frame optimization in a dual mode system as described above.
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, CD-ROM, 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.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A beacon frame optimization method under a dual-mode system, wherein the dual-mode system adopts HPLC and HRF dual-mode networking, and a beacon period of a beacon frame comprises adjacent beacon time slots and CSMA time slots and an identification bit for identifying a boundary position of the beacon time slots and the CSMA time slots, the method comprises the following steps:
determining that a beacon frame on the HRF link needs to occupy the CSMA time slot for transmission;
and updating the boundary position in the identification bit to enable the CSMA time slot to start a CSMA mode after the updated boundary position.
2. The method of claim 1, wherein determining that a beacon frame on the HRF link needs to occupy the CSMA slot for transmission comprises:
acquiring and analyzing a wireless beacon identification bit in an information field of a non-central beacon;
and if the wireless beacon identification bit is determined to be a preset value, determining that the beacon frame needs to occupy the CSMA time slot for transmission.
3. The method of claim 1, wherein determining that a beacon frame on the HRF link needs to occupy the CSMA slot for transmission comprises:
determining the sending time sequence of the nodes in the beacon period according to the topological relation of the nodes in the dual-mode system;
determining whether there is a node transmitting a reduced frame beacon on the wireless link whose transmission timing is occupied by a node transmitting a standard frame beacon on the wireless link,
and if so, determining that the beacon frame needs to occupy the CSMA time slot for transmission.
4. The method of claim 1, wherein the updating the demarcation location in the identification bits comprises:
and determining the post-shift time length of the boundary position according to the number of the beacon frames occupying the CSMA time slot and the sending time length of each beacon frame.
5. The method of claim 1, wherein the demarcation location and the updated demarcation location are both expressed in terms of a time duration, the time duration being a value of a length of an RF beacon slot in a beacon frame.
6. The method of claim 5, further comprising: and updating and determining the following parameters according to the updated boundary position: CSMA time slot starting time and the effective length of the CSMA time slot;
the CSMA slot start time is equal to the beacon period start time + the RF beacon slot length;
the CSMA slot effective length is equal to the beacon period length-RF beacon slot length.
7. The method of claim 1, wherein the beacon frames transmitted on the HRF link occupying the CSMA slots are transmitted in a time division manner.
8. A beacon frame optimization device under a dual-mode system is applied to the dual-mode system adopting HPLC and HRF dual-mode networking, and is characterized by comprising the following steps:
a determining module, configured to determine whether a beacon frame on the HRF link needs to occupy the CSMA timeslot for transmission; and
and the updating module is used for updating the boundary position in the identification bit under the condition that the beacon frame on the HRF link is determined to occupy the CSMA time slot for sending, so that the CSMA time slot starts a CSMA mode after the updated boundary position.
9. A beacon frame optimization device under a dual mode system, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the beacon frame optimization method under a dual mode system as claimed in any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the steps of the beacon frame optimization method under a dual-mode system of any one of claims 1 to 7.
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