CN111093249B

CN111093249B - Wireless local area network communication method, system and wireless transceiving equipment

Info

Publication number: CN111093249B
Application number: CN201911237008.9A
Authority: CN
Inventors: 高子豪; 徐斌; 产江林
Original assignee: Hefei Zhonggan Micro Electronic Co ltd
Current assignee: Hefei Zhonggan Micro Electronic Co ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2022-06-21
Anticipated expiration: 2039-12-05
Also published as: CN111093249A

Abstract

The wireless local area network communication method, system and wireless transceiver device include: searching the broadcast message sent by the central node in the searching time interval of the searching interval by the peripheral node which is not connected with the central node; if the broadcast message sent by the central node is not searched in the search waiting time, the peripheral node becomes the central node; the central node or the peripheral node searches broadcast messages sent by other central nodes in the search time interval of the search interval; when the broadcast messages sent by other central nodes are searched, the central node connected with the central node or the peripheral node becomes the peripheral node. By adopting the scheme in the application, each node searches the broadcast messages of other nodes in the searching time interval of the searching interval, the peripheral node becomes the central node when no central node exists, and the current central node becomes the peripheral node when a plurality of central nodes exist, so that the mutual communication among the nodes is ensured.

Description

Wireless local area network communication method, system and wireless transceiving equipment

Technical Field

The present application relates to wireless local area network technologies, and in particular, to a wireless local area network communication method, a wireless local area network communication system, and a wireless transceiver.

Background

The wireless local area network allows a plurality of devices to be connected with each other and exchange information by using a wireless technology, thereby realizing the cooperative work of the plurality of devices and bringing great convenience to the life of people. The topology of the wireless local area network is mainly divided into two types:

one of the devices is a star network structure, and a plurality of devices are connected with a central node under the structure and exchange information with other node devices through the central node. For example: two computers connected to the same router can send messages or online games, and the wireless sound box can be connected with a mobile phone by using Wi-Fi or Bluetooth technology and plays music;

the second is a mesh structure, and the wireless devices are connected with each other under the structure. For example: the smart home and the sensor can establish mesh connection through Wi-Fi or Bluetooth technology to realize functions of adjusting room temperature, lighting and the like according to activities of users.

However, both of the above topologies have disadvantages:

in the star network structure, communication among a plurality of devices depends on a central node, and when the central node does not exist or is not in a working area, other devices cannot communicate with each other; in addition, if there are two or more central nodes in an area, two devices connecting different central nodes will not be able to communicate with each other;

in the mesh network structure, a large number of independent connections need to be established among a plurality of wireless devices, so that limited bandwidth is consumed, the throughput is reduced, and the network scale is limited; in addition, when multiple devices need to share information, the information needs to be transmitted multiple times in a multi-hop forwarding manner, which occupies additional bandwidth and causes higher delay.

Disclosure of Invention

The embodiment of the application provides a wireless local area network communication method, a wireless local area network communication system and wireless transceiving equipment, so as to solve the technical problem.

According to a first aspect of embodiments of the present application, there is provided a wireless local area network communication method, including the following steps:

searching the broadcast message sent by the central node in the searching time interval of the searching interval by the peripheral node which is not connected with the central node;

and if the broadcast message sent by the central node is not searched in the search waiting time, the peripheral node becomes the central node, the broadcast message is sent in the downlink time interval in the communication interval, and the feedback message is received in the uplink time interval in the communication interval.

According to a second aspect of the embodiments of the present application, there is provided a wireless local area network communication method, including the following steps:

the central node searches broadcast messages sent by other central nodes in the search time interval of the search interval;

when the central node searches the broadcast messages sent by other central nodes, the central node becomes a peripheral node, receives the broadcast messages in the downlink time interval in the communication interval, and sends the feedback messages in the uplink time interval in the communication interval.

According to a third aspect of the embodiments of the present application, there is provided a wireless local area network communication method, including the following steps:

peripheral nodes connected with the central node search broadcast messages sent by other central nodes in the search time interval of the search interval;

when a peripheral node searches broadcast messages sent by other central nodes, the peripheral node sends a feedback message including a work stop request to the central node connected with the peripheral node in an uplink period of a communication interval; and the central node becomes a peripheral node after receiving the work stopping request.

According to a fourth aspect of the embodiments of the present application, there is provided a wireless local area network communication system, including: a central node and a peripheral node, wherein,

the peripheral nodes which are not connected with the central node are used for searching the broadcast messages sent by the central node in the searching time interval of the searching interval;

if the broadcast message sent by the central node is not searched in the search waiting time, the peripheral node becomes the central node, the broadcast message is sent in the downlink time interval in the communication interval, and the feedback message is received in the uplink time interval in the communication interval.

According to a fifth aspect of the embodiments of the present application, there is provided a wireless local area network communication system, including: a central node and a peripheral node, wherein,

the central node is used for searching broadcast messages sent by other central nodes in the searching time interval of the searching interval;

According to a sixth aspect of the embodiments of the present application, there is provided a wireless local area network communication system, including: a central node and a peripheral node, wherein,

the peripheral nodes connected with the central node are used for searching broadcast messages sent by other central nodes in the searching time interval of the searching interval;

when a peripheral node searches broadcast messages sent by other central nodes, the peripheral node is used for sending a feedback message including a work stopping request to the central node in an uplink period of a communication interval; and the central node becomes a peripheral node after receiving the work stopping request.

According to a seventh aspect of the embodiments of the present application, there is provided a wireless transceiving apparatus, including: an antenna, a radio frequency transceiver, a baseband data and protocol processor, a user interface, wherein,

the radio frequency transceiver is used for searching broadcast messages sent by the central node through the antenna in the searching time interval of the searching interval when the node is a peripheral node which is not connected with the central node;

the baseband data and protocol processor is used for changing the node into the central node if the broadcast message sent by the central node is not searched in the search waiting time;

the radio frequency transceiver is further configured to transmit a broadcast message through the antenna during a downlink time period within the communication interval and receive a feedback message through the antenna during an uplink time period within the communication interval.

According to an eighth aspect of embodiments of the present application, there is provided a wireless transceiving apparatus, comprising: an antenna, a radio frequency transceiver, a baseband data and protocol processor, a user interface, wherein,

the radio frequency transceiver is used for searching broadcast messages sent by other central nodes through an antenna in a searching time interval of a searching interval when the node is the central node;

the baseband data and protocol processor is used for changing the node into a peripheral node when searching broadcast messages sent by other central nodes;

the radio frequency transceiver is further configured to receive a broadcast message through the antenna during a downlink time period within the communication interval and to transmit a feedback message through the antenna during an uplink time period within the communication interval.

According to a ninth aspect of embodiments of the present application, there is provided a wireless transceiving apparatus, comprising: an antenna, a radio frequency transceiver, a baseband data and protocol processor, a user interface, wherein,

the radio frequency transceiver is used for searching broadcast messages sent by other central nodes through an antenna in a searching time interval of a searching interval when the node is a peripheral node connected with the central node;

and the baseband data and protocol processor is used for controlling the radio frequency transceiver to send a feedback message comprising a work stopping request to the central node connected with the node through the antenna in the uplink period of the communication interval when the broadcast message sent by other central nodes is searched.

By using the wireless local area network communication method, system and wireless transceiver device provided in the embodiments of the present application, each node (i.e., wireless transceiver device) in the wireless local area network may search for broadcast messages of other nodes in a search period of a search interval, and according to a search condition, it may be determined that there is no central node or there are multiple central nodes in the current local area network, and then a peripheral node becomes a central node when there is no central node in the current local area network to maintain communication of each node in the local area network, and when there are multiple central nodes in the current local area network, the current central node becomes a peripheral node so that there are no multiple central nodes in the local area network, and it is ensured that the nodes can communicate with each other.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a wireless local area network communication system in an embodiment of the present application;

fig. 2 shows a schematic structural diagram of a wireless transceiver device in an embodiment of the present application;

fig. 3 is a schematic diagram illustrating a communication interval and uplink and downlink time periods in an embodiment of the present application;

fig. 4 is a flowchart illustrating an implementation of a wireless local area network communication method according to a first embodiment of the present application;

FIG. 5 is a diagram illustrating a search interval and a search period according to an embodiment of the present application;

fig. 6 is a flowchart illustrating an implementation of a wireless local area network communication method according to a second embodiment of the present application;

fig. 7 is a flowchart illustrating an implementation of a wireless local area network communication method according to a third embodiment of the present application;

fig. 8 shows a flowchart executed by any node in the tenth embodiment of the present application when a wireless local area network structure is changed.

Detailed Description

In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

In view of the technical problems in the prior art, the embodiments of the present application provide a method for generating and converting a star network central node, and a wireless transceiver and a wireless lan communication system using the method, including a generation mechanism, a discovery mechanism and a contention mechanism of the local network central node, a search mechanism and a conversion mechanism of peripheral nodes, and the like, which are described in detail below.

Fig. 1 shows a schematic structural diagram of a wireless local area network communication system in an embodiment of the present application.

As shown in the figure, the wireless local area network communication system includes: the system comprises a central node and peripheral nodes, wherein the central node and the peripheral nodes transmit broadcast messages through a downlink time interval of a communication interval and transmit feedback messages through an uplink time interval of the communication interval.

In the embodiment of the present application, when any device attempts to join the wireless lan, it may become a central node or a peripheral node.

In specific implementation, the broadcast message may include necessary information provided by the central node to the peripheral nodes for synchronizing and receiving the broadcast message, control information used by the central node to control the peripheral nodes, data to be sent by the central node to the peripheral nodes, and the like; the feedback message may include necessary information required by the peripheral node to maintain communication with the central node, control information used by the peripheral node to control the central node or other peripheral nodes, data to be sent by the peripheral node to the central node or other peripheral nodes, and so on.

Specifically, the central node may adjust its signal transmission power or the number of times of retransmission of the broadcast message according to the signal strength in the peripheral node feedback message, and may select a plurality of channels with higher channel quality as downlink/uplink channels according to the channel quality in the feedback message; the peripheral node may adjust its own signal transmission power according to the signal strength in the broadcast message of the central node, or adjust the number of times of retransmission of the feedback message and the minimum transmission interval, etc.

Each node in the wireless local area network is specifically a wireless transceiver device, and the wireless transceiver device can act as one of a central node and a peripheral node in the wireless local area network at the same time.

Fig. 2 shows a schematic structural diagram of a wireless transceiving device in an embodiment of the present application.

As shown, the wireless transceiving apparatus comprises: the radio frequency transceiver is used for receiving and transmitting broadcast messages through the antenna in a downlink time interval of a communication interval and receiving and transmitting feedback messages through the antenna in an uplink time interval of the communication interval.

Specifically, when the central node is used, the antenna is configured to receive a radio frequency signal including a feedback message sent by a peripheral node, demodulate the radio frequency signal into a baseband signal by the radio frequency transceiver, and recover the baseband signal into the feedback message by the baseband data and protocol processor. The central node may change the working state (e.g., communication channel, transmission power, lan structure, etc.) of the node according to the control message in the feedback message, or may change the use state of the node according to the data in the feedback message. In addition, the central node can also control the working state and the use state of the peripheral nodes according to the feedback message, the control message and the data obtained through the user interface and the self information. In specific implementation, the user interface may be a key, a touch screen, a wireless control interface, or the like.

When the antenna is used as a peripheral node, the antenna is used for receiving a radio frequency signal which is sent by the central node and comprises a broadcast message, the radio frequency signal is demodulated into a baseband signal through the radio frequency transceiver, and the baseband signal is recovered into the broadcast message through the baseband data and protocol processor. The peripheral node can maintain the connection with the central node or change the working state of the node according to the control message in the broadcast message, and can also change the use state of the node according to the data in the broadcast message.

Fig. 3 shows a schematic diagram of a communication interval and an uplink and downlink time period in an embodiment of the present application.

As shown in the figure, the central node and the peripheral node communicate in the uplink and downlink periods of the communication interval, where the downlink period is used for transmitting the broadcast message sent by the central node, and the uplink period is used for transmitting the feedback message sent by the peripheral node.

Specifically, the communication interval may be divided into a plurality of downlink time periods and a plurality of uplink time periods, and the downlink time periods and the uplink time periods may be arranged in a crossed manner, for example: the 1 st, 3 rd, 5 th or other odd-numbered periods are downlink periods, and the 2 nd, 4 th, 6 th or other even-numbered periods are uplink periods.

In specific implementation, the central node may send a broadcast message in a first downlink period of each communication interval, and receive a feedback message in a first uplink period; when the central node has the control message or the data to be broadcast, the control message or the data can be retransmitted in other downlink periods of the communication interval or the downlink periods of other communication intervals to ensure that the peripheral nodes correctly receive the control message or the data.

The peripheral node can receive the broadcast message in the first downlink time interval of each communication interval, and can receive the broadcast message again in the second, third or other downlink time intervals when the first downlink time interval fails to receive the broadcast message correctly; when the peripheral node has control information or data to be fed back, the feedback information can be sent in the first uplink time interval, and the feedback information can be sent again in the second, third or other uplink time intervals.

Example one

In order to solve the technical problem in the prior art that a central node does not exist, stops working, or leaves a working area, so that a peripheral node loses network connection, an embodiment of the present application provides a wireless local area network communication method, in which a peripheral node actively searches for other central nodes or becomes a central node in a search period of a search interval, so as to maintain wireless local area network communication, which is described in detail below.

Fig. 4 is a flowchart illustrating an implementation of a wireless local area network communication method according to a first embodiment of the present application.

As shown in the figure, the wireless local area network communication method includes:

step 401, peripheral nodes which are not connected with the central node search broadcast messages sent by the central node in the search time interval of the search interval;

step 402, if the broadcast message sent by the central node is not searched in the search waiting time, the peripheral node becomes the central node, the broadcast message is sent in the downlink time interval in the communication interval, and the feedback message is received in the uplink time interval in the communication interval.

In an embodiment, if a broadcast message sent by a central node is searched within a search waiting time, a connection is established with the central node according to the broadcast message, and the wireless local area network is joined.

In this application, the peripheral node is not connected to the central node, and may be understood as including two cases: firstly, when the peripheral node tries to join the wireless local area network, the process of establishing a link with the central node is not executed; secondly, the peripheral node has already joined the wireless local area network and has already established a connection with the central node, but for some reason, the peripheral node cannot receive the broadcast message of the central node, so it is also called that the peripheral node has not established a connection with the central node.

In one embodiment, the peripheral node becomes a peripheral node that does not establish a connection with the central node when the peripheral node fails to receive the broadcast message of the central node during the downstream period of the communication interval during the connection latency.

According to the wireless local area network communication method provided by the embodiment of the application, the peripheral nodes in the wireless local area network can actively search the broadcast message of the central node in the search time interval of the search interval and become the central node when no central node exists in the current wireless local area network, so that the communication of each node in the wireless local area network is maintained.

In one embodiment, the search latency is randomly generated.

In specific implementation, when searching is performed in the search period of the search interval, search waiting time may be set, the search waiting time is randomly generated, and the search is ended when the search waiting time is reached. Specifically, the peripheral node searches for the broadcast message sent by the central node in the search period of the search interval, and if the broadcast message is not searched in the search waiting time, the peripheral node becomes the central node. In the embodiment of the application, the search waiting time is randomly generated so as to prevent a plurality of peripheral nodes from being simultaneously changed into the central node after being incapable of being discovered.

In one embodiment, the searching for the broadcast message sent by the central node in the search period of the search interval by the peripheral node which does not establish connection with the central node includes:

when the peripheral node receives the broadcast message which is sent by the central node and comprises the stop working message in the downlink period of the communication interval, the peripheral node does not communicate with the central node any more, and searches the broadcast message sent by the central node in the search period of the search interval; alternatively, the first and second electrodes may be,

and when the peripheral node does not receive the broadcast message of the central node in the downlink period of the communication interval in the connection waiting time, the peripheral node searches the broadcast message sent by the central node in the searching period of the searching interval.

In specific implementation, when the central node needs to stop working or no longer serves as the central node or leaves a working area, before the central node needs to stop working or no longer serves as the central node or leaves the working area, the central node sends a broadcast message including a working stop message to the peripheral nodes in a downlink period of a communication interval, and after receiving the working stop message, the peripheral nodes no longer communicate with the central node and search the central node in a search period of a search interval.

In one embodiment, the central node may send the broadcast message including the stop-work message multiple times before needing to stop working or no longer functioning as a central node or leaving a working area to ensure that the peripheral nodes can properly receive the message.

In one embodiment, when the central node stops working or no longer functions as the central node or leaves a working area and does not send the stop working message in the downlink period of the communication interval, the peripheral node cannot receive the broadcast message of the central node in the downlink period of the communication interval. At this time, the peripheral node may continuously attempt to receive the broadcast message, and if the broadcast message is not received within the connection waiting time, the peripheral node searches for other central nodes within the search period of the search interval. If no other central node is searched in the search waiting time, the peripheral node becomes the central node.

Considering that the communication interval and the search interval of two or more central nodes or peripheral nodes may be the same, if the start times of the communication interval and the search interval of the nodes are also the same, the nodes may remain in the uplink period, the downlink period, or the search period at the same time, so that any node cannot search for (or discover) other nodes, and therefore, the embodiments of the present application may be implemented in the following manner.

In one embodiment, when the search period of any node overlaps with the uplink period or the downlink period, the node selects and executes the search period, the uplink period or the downlink period according to the frequency of the valid data transmitted by the uplink period and/or received by the downlink period. In the present application, the term "overlap" may include various overlapping manners such as partial overlap and complete overlap.

In specific implementation, when the search time period of a certain node overlaps with the uplink time period and/or the downlink time period, the node randomly selects to execute the search time period or execute the uplink and downlink time periods. When a node performs random selection, the probability of random selection can be determined according to the frequency of sending or receiving effective data in uplink and downlink time periods. Specifically, the higher the frequency of the valid data contained in the uplink time period and/or the downlink time period is, the smaller the probability of executing the search time period in the random selection is; conversely, the greater the probability of performing a search period.

The embodiment of the application solves the problem that the nodes cannot be found mutually by adopting the random avoidance mechanism.

Considering that the feedback messages may interfere with each other when a plurality of peripheral nodes send the feedback messages to the central node at the same time, the embodiment of the present application may also be implemented in the following manner.

In one embodiment, a feedback message sent by a peripheral node includes feature information of the peripheral node, a broadcast message sent by a central node includes the number of peripheral nodes, and the number of peripheral nodes is determined by the central node according to the number of different feature information in the feedback message; and the peripheral nodes adjust the minimum sending interval of the feedback messages according to the number of the peripheral nodes.

The characteristic information of the peripheral node may be information representing the identity of the peripheral node, such as a bluetooth address, a mobile phone number, an equipment number, and the like.

In specific implementation, the peripheral node includes the characteristic information of the node in the feedback message. The central node estimates the number of peripheral nodes according to the number of different characteristic information in the received feedback message, and sends the number of the peripheral nodes to the peripheral nodes through a broadcast message. Specifically, the central node regards the number of different feature information received in a predetermined time period as the number of peripheral nodes. And the peripheral nodes adjust the minimum sending interval of the feedback messages according to the number of the peripheral nodes. Specifically, the larger the number of peripheral nodes, the larger the minimum transmission interval of the feedback message.

According to the method and the device, the minimum sending interval of the feedback messages sent by the peripheral nodes is adjusted by counting the number of the peripheral nodes connected with the central node, so that the frequency of sending the feedback messages by the peripheral equipment is reduced, and further mutual interference is reduced.

In order to solve the problem that when a plurality of peripheral nodes send feedback messages simultaneously, the feedback messages may interfere with each other, the embodiments of the present application may also be implemented in the following manner.

In an embodiment, the peripheral node adjusts a minimum transmission interval for the node to transmit the feedback message according to a data amount to be transmitted by the node.

Specifically, when the peripheral node has data to be sent, the minimum sending interval of the feedback message is smaller; and when the peripheral node has no data to be sent, the minimum sending interval of the feedback message is larger.

According to the method and the device, the minimum sending interval of the feedback message sent by the peripheral node is adjusted according to the data volume to be sent of the peripheral node, so that the frequency of the feedback message sent by the peripheral equipment is reduced, and further mutual interference is reduced.

In consideration of that in the downlink time period or the uplink time period, a message sent by the central node or the peripheral node may be repeatedly sent multiple times, or the central node or the peripheral node receives messages sent by other nodes multiple times, which causes message confusion, the embodiment of the present application may be implemented in the following manner.

In one implementation, the broadcast message of the central node includes a serial number, the feedback message of the peripheral node includes a serial number and characteristic information, and when the peripheral node receives the broadcast message, the peripheral node determines whether the broadcast message is a repeat message according to the comparison between the serial number in the broadcast message and the previously received serial number; when the central node receives the feedback message, whether the feedback message is a repeat message is determined according to the comparison between the sequence number and the characteristic information in the feedback message and the previously received sequence number and characteristic information. The prior may be the previous time or the previous time, i.e., the most recent time before this time.

In particular, the central node may include a sequence number in the broadcast message, which is changed each time the content of the message sent is updated. When the peripheral node receives the broadcast message, the sequence number in the broadcast message is compared with the sequence number in the previously received broadcast message. If the sequence number is different from the previous one, the message is considered as a new message, otherwise, the message is considered as a repeated message. The peripheral node may include a sequence number and characteristic information in the feedback message, the sequence number being changed whenever the content of the message sent is updated. When the central node receives the feedback message, the sequence number in the secondary feedback message is compared with the sequence number in the previously received feedback message, and the characteristic information in the secondary feedback message is compared with the characteristic information in the previously received feedback message. If the sequence number or the characteristic information is different from the previous sequence number or the characteristic information, the message is considered to be a new message, and otherwise, if the sequence number and the characteristic information are the same as the previous sequence number and the previous characteristic information, the message is considered to be a repeated message.

According to the embodiment of the application, the sequence number is added in the broadcast message, and the sequence number and the characteristic information are added in the feedback message, so that the problem of message confusion is avoided.

Fig. 5 is a schematic diagram illustrating a search interval and a search period according to an embodiment of the present application.

As can be seen from fig. 3 and fig. 5, the wireless local area network communication method according to the embodiment of the present application includes a communication interval, where the communication interval includes a downlink time period, and is used for a central node to broadcast and send a broadcast message on a downlink channel, and a peripheral node to receive the broadcast message on the downlink channel; the uplink time interval is used for the peripheral node to send a feedback message on an uplink channel, and the central node receives the feedback message on the uplink channel;

the system also comprises a search interval which comprises a search time period and is used for searching the broadcast message on the downlink channel by the central node and/or the peripheral node and changing the identity of the node or the central node in communication connection with the node according to the search condition.

When any node in the wireless local area network needs to establish connection with other nodes or needs to receive broadcast messages of unconnected nodes, the node can actively search for the broadcast messages sent by other nodes in the search period of the search interval. Specifically, the peripheral node may search for the central node in the search period of the search interval in order to access the wireless local area network, or the central node or the peripheral node may search for broadcast messages sent by other central nodes in the search period of the search interval in order to reduce the number of central nodes in the wireless local area network.

In one embodiment, the search interval is greater than the communication interval, the search period in the search interval is greater than the uplink period and the downlink period in the communication interval, and a division of the search interval and the communication interval has a non-zero remainder, and the remainder is less than a difference between the search period and the uplink period or the downlink period.

By setting the relationship between the search interval and the communication interval, each node (central node or peripheral node) can be ensured to search the broadcast information within an acceptable time interval.

Example two

In order to solve the technical problem in the prior art that peripheral nodes connected to different central nodes cannot communicate with each other due to the presence of multiple central nodes in a wireless local area network, an embodiment of the present application provides a wireless local area network communication method, in which a central node in a wireless local area network actively searches for other central nodes in a search interval and changes any central node into a peripheral node, thereby solving the problem that multiple central nodes exist in one wireless local area network, which is described in detail below.

Fig. 6 is a flowchart illustrating an implementation of a wireless local area network communication method in the second embodiment of the present application.

601, searching broadcast messages sent by other central nodes in a searching time interval of a searching interval by the central node;

step 602, when the central node searches the broadcast messages sent by other central nodes, the central node becomes a peripheral node, receives the broadcast messages in the downlink time period in the communication interval, and sends the feedback messages in the uplink time period in the communication interval.

In an embodiment, if the central node does not search for the broadcast message sent by other central nodes, the central node continues to serve as the central node, sends the broadcast message in the downlink time period in the communication interval, and receives the feedback message in the uplink time period in the communication interval.

In one embodiment, when the central node communicates with the peripheral nodes in the uplink period and the downlink period in the communication interval, the broadcast messages sent by other central nodes are searched in the search period in the search interval. If the broadcast message sent by other central nodes is received in the search time period, the central node can choose not to act as the central node any more, but instead act as the peripheral node. When the central node becomes a peripheral node due to searching other central nodes, the central node does not need to search any more and directly establishes connection with the searched other central nodes according to the received broadcast message.

According to the wireless local area network communication method provided by the embodiment of the application, the central node in the wireless local area network can actively search the broadcast messages of other central nodes in the search interval, and the central node itself becomes a peripheral node when the broadcast messages of other central nodes are searched (namely, two or more central nodes exist in the wireless local area network), so that the number of the central nodes in the wireless local area network is reduced, and the peripheral nodes are ensured to be connected with the same central node to communicate with each other.

Considering that when two or more central nodes search for a broadcast message sent by the other side at the same time and all the central nodes are changed to serve as peripheral nodes in the process of changing the central node into the peripheral nodes, the embodiment of the present application may cause that no central node exists in a local area network.

In one embodiment, the broadcast message sent by the central node includes the characteristic information of the node; if the broadcast messages sent by other central nodes are searched, the central nodes become peripheral nodes, and the method comprises the following steps:

when the central node searches the broadcast messages sent by other central nodes, the central node compares the characteristic information of the central node with the characteristic information of other central nodes sending the broadcast messages according to a preset priority judgment rule, and when the central node is a disadvantaged party, the central node becomes a peripheral node.

Specifically, when the central node communicates with the peripheral nodes in the uplink period and the downlink period of the communication interval, the broadcast messages sent by other central nodes are searched in the search period of the search interval, and the broadcast message sent by each central node in the downlink period may include the feature information of the node. When the central node searches the broadcast messages sent by other central nodes in the searching time period, comparing the characteristic information of the node with the characteristic information of the opposite node. If the node becomes the dominant party in the comparison, the node continues to work as a central node; if the node becomes a disadvantage side in the comparison, the node no longer serves as a central node, but serves as a peripheral node instead.

The characteristic information of the central node can be information representing the identity of the central node, such as a Bluetooth address, a mobile phone number, an equipment number and the like; the priority level of the central node may also be preset information used for representing the priority level of the central node, such as a priority level identifier preset for each central node according to a priority level determination rule.

In a specific embodiment, the priority determination rule may be set according to an actual requirement, and the present application is not limited thereto. In one embodiment, the priority determination rule may determine the priority in a certain order (e.g., from the highest order to the lowest order) according to the size of each numerical value in the bluetooth address (or the mobile phone number, the device number, etc.).

According to the embodiment of the application, the influence caused by the fact that a plurality of central nodes are converted into peripheral nodes at the same time is solved through a competition mechanism of the central nodes.

When the central node cannot execute the searching function due to insufficient processing speed, overhigh power consumption or other reasons, the peripheral nodes can replace the central node to execute the function of searching other central nodes. When the peripheral node searches for other central nodes, a feedback message of the work stop request is sent to the currently connected central node, and the embodiment of the present application may further include:

and when a feedback message which is sent by the peripheral node and comprises a work stop request is received, the central node becomes the peripheral node.

In one embodiment, when the search period of any node overlaps with the uplink period or the downlink period, the node selects and executes the search period, the uplink period or the downlink period according to the frequency of the valid data transmitted by the uplink period and/or received by the downlink period.

In specific implementation, when the search time period of a node overlaps with the uplink time period or the downlink time period, the node randomly selects to execute the search time period or execute the uplink and downlink time periods. When a node performs random selection, the probability of random selection can be determined according to the frequency of sending or receiving effective data in uplink and downlink time periods. Specifically, the higher the frequency of the effective data contained in the uplink and downlink time periods is, the lower the probability of executing the search time period during random selection is; conversely, the greater the probability of performing a search period.

In one embodiment, a feedback message sent by a peripheral node includes characteristic information of the peripheral node, a broadcast message sent by a central node includes the number of peripheral nodes, and the number of peripheral nodes is determined by the central node according to the number of different characteristic information in the feedback message; and the peripheral nodes adjust the minimum sending interval of the feedback messages according to the number of the peripheral nodes.

In specific implementation, the peripheral node includes the characteristic information of the node in the feedback message. The central node estimates the number of peripheral nodes according to the number of different characteristic information in the received feedback message, and sends the number of the peripheral nodes to the peripheral nodes through a broadcast message. Specifically, the central node regards the number of different feature information received in the last period of time as the number of peripheral nodes. And the peripheral nodes adjust the minimum sending interval of the feedback message according to the number of the peripheral nodes. Specifically, the larger the number of peripheral nodes, the larger the minimum transmission interval of the feedback message.

In specific implementation, the attribute or setting rule of the feature information of the peripheral node may be the same as or different from the attribute or setting rule of the feature information of the central node. For example, bluetooth addresses may all be used as the characteristic information.

In one implementation, the broadcast message of the central node includes a serial number, the feedback message of the peripheral node includes a serial number and characteristic information, and when the peripheral node receives the broadcast message, the peripheral node determines whether the broadcast message is a repeat message according to the comparison between the serial number in the broadcast message and the previously received serial number; when the central node receives the feedback message, whether the feedback message is a repeat message is determined according to the comparison between the sequence number and the characteristic information in the feedback message and the previously received sequence number and characteristic information.

In particular, the central node may include a sequence number in the broadcast message, which is changed each time the content of the message sent is updated. When the peripheral node receives the broadcast message, the sequence number in the broadcast message is compared with the sequence number in the previously received broadcast message. If the sequence numbers are different, the message is considered as a new message, otherwise, the message is considered as a repeated message. The peripheral node may include a sequence number and characteristic information in the feedback message, the sequence number being changed whenever the content of the message sent is updated. When the central node receives the feedback message, the sequence number and the characteristic information in the feedback message are compared with the sequence number and the characteristic information in the feedback message received before. If the sequence numbers are different, the message is considered as a new message, otherwise, the message is considered as a repeated message.

EXAMPLE III

In order to solve the technical problem in the prior art that peripheral nodes connected to different central nodes cannot communicate with each other due to the presence of multiple central nodes in a wireless local area network, an embodiment of the present application further provides another wireless local area network communication method, where a peripheral node in a wireless local area network actively searches for other central nodes in a search period of a search interval and informs a currently connected central node when other central nodes are searched, so that the central node becomes a peripheral node, thereby solving the problem that one wireless local area network has multiple central nodes, which is described in detail below.

Fig. 7 is a flowchart illustrating an implementation of a wireless local area network communication method in the third embodiment of the present application.

701, searching broadcast messages sent by other central nodes in a searching time period of a searching interval by peripheral nodes connected with the central nodes;

step 702, when a peripheral node searches broadcast messages sent by other central nodes, the peripheral node sends a feedback message including a work stop request to the central node connected with the peripheral node in an uplink period of a communication interval; and the central node becomes a peripheral node after receiving the work stopping request.

In one embodiment, the peripheral node searches for broadcast messages sent by other central nodes in the search period of the search interval, and the peripheral node may perform the search function instead of the central node when the central node to which the peripheral node is connected cannot perform the search function due to insufficient processing speed, excessive power consumption, or other reasons.

In one embodiment, the peripheral node searches for broadcast messages sent by other central nodes in the search period in the search interval while communicating with the central node in the uplink period and the downlink period in the communication interval.

According to the wireless local area network communication method provided by the embodiment of the application, the peripheral nodes in the wireless local area network can actively search the broadcast messages of other central nodes in the search interval, and when the broadcast messages of other central nodes are searched (namely two or more than two central nodes exist in the wireless local area network), the peripheral nodes request the central nodes connected with the peripheral nodes to be changed into the peripheral nodes, so that the number of the central nodes in the wireless local area network is reduced, and the peripheral nodes are ensured to be connected with the same central node to further communicate with each other.

Considering that when two or more central nodes are changed into peripheral nodes, and the peripheral nodes connected to the central nodes search for the broadcast message sent by the other central node at the same time, and are all requested to be changed into peripheral nodes, there may be no central node in a local area network, and the embodiment of the present application may also be implemented in the following manner.

In one embodiment, the broadcast message sent by the central node includes the characteristic information of the central node; when the peripheral node searches broadcast messages sent by other central nodes, the peripheral node sends a feedback message including a work stop request to the central node connected with the peripheral node in an uplink period of a communication interval, and the method comprises the following steps:

when a peripheral node searches broadcast messages sent by other central nodes, the peripheral node compares the characteristic information of the central node connected with the peripheral node with the characteristic information of other central nodes sending the broadcast messages, and when the central node connected with the peripheral node is a disadvantaged party, the peripheral node sends a feedback message including a work stop request to the central node connected with the peripheral node at an uplink time interval of a communication interval.

Specifically, the peripheral node communicates with the central node in the uplink period and the downlink period in the communication interval, and searches for the broadcast message sent by other central nodes in the search period in the search interval, where the broadcast message sent by each central node in the downlink period may include the characteristic information of the node. When the peripheral node searches the broadcast messages sent by other central nodes in the searching period, the central node of the network where the peripheral node is located is compared with the characteristic information of the central node of the opposite party. If the network center node becomes the dominant party in the comparison, the search is ignored; if the central node of the network becomes a disadvantage side in comparison, a work stopping request can be sent to the central node. After the central node receives the work stop request, the central node can be selected not to be used as the central node, but to be used as the peripheral node.

According to the embodiment of the application, the influence caused by the fact that a plurality of central nodes are simultaneously converted into peripheral nodes is solved through a competition mechanism of the central nodes.

In specific implementation, the peripheral node includes the characteristic information of the node in the feedback message. The central node estimates the number of peripheral nodes according to the number of different characteristic information in the received feedback message, and sends the number of the peripheral nodes to the peripheral nodes through a broadcast message. Specifically, the central node regards the number of different feature information received in the last period of time as the number of peripheral nodes. And the peripheral nodes adjust the minimum sending interval of the feedback message according to the number of the peripheral nodes. Specifically, the larger the number of peripheral nodes is, the larger the minimum transmission interval of the feedback message is.

In particular, the central node may include a sequence number in the broadcast message, which is changed each time the content of the message sent is updated. When the peripheral node receives the broadcast message, the sequence number in the broadcast message is compared with the sequence number in the previously received broadcast message. If the sequence number is different from the previous one, the message is considered as a new message, otherwise, the message is considered as a repeated message. The peripheral node may include a sequence number and characteristic information in the feedback message, the sequence number being changed whenever the content of the message sent is updated. When the central node receives the feedback message, the sequence number in the secondary feedback message is compared with the sequence number in the previously received feedback message, and the characteristic information in the secondary feedback message is compared with the characteristic information in the previously received feedback message. If the sequence number or the characteristic information is different from the previous sequence number or the characteristic information, the message is considered to be a new message, and if the sequence number or the characteristic information is the same as the previous sequence number or the previous characteristic information, the message is considered to be a repeated message.

Example four

Based on the same inventive concept, the embodiment of the present application provides a wireless local area network communication system, which is similar to the principle of the wireless local area network communication method described in the first embodiment for solving the problem, and repeated details are not repeated.

The wireless local area network communication system includes: a central node and a peripheral node, wherein,

According to the wireless local area network communication system provided by the embodiment of the application, the peripheral nodes in the wireless local area network can actively search the broadcast message of the central node in the search time interval of the search interval and become the central node when no central node exists in the current wireless local area network, so that the communication of each node in the wireless local area network is maintained.

In one embodiment, the central node is further configured to send a broadcast message including a stop-work message to the peripheral nodes during a downlink period within the communication interval before needing to stop working or no longer function as the central node or leave the working area.

In one embodiment, the search latency is randomly generated.

In one embodiment, a feedback message of a peripheral node includes feature information of the node, a broadcast message of a central node includes the number of peripheral nodes, and the number of peripheral nodes is determined according to the number of different feature information in the feedback message; and the peripheral nodes adjust the minimum sending interval of the feedback messages according to the number of the peripheral nodes.

In an embodiment, the peripheral node adjusts a minimum transmission interval for the local node to transmit the feedback message according to a data amount to be transmitted by the local node.

In one embodiment, the broadcast message of the central node includes a serial number, the feedback message of the peripheral node includes a serial number and characteristic information, and the peripheral node determines whether the broadcast message is a repeat message according to the comparison between the serial number in the broadcast message and the previously received serial number when receiving the broadcast message; when the central node receives the feedback message, whether the feedback message is a repeat message is determined according to the comparison between the sequence number and the characteristic information in the feedback message and the previously received sequence number and characteristic information.

EXAMPLE five

Based on the same inventive concept, the embodiment of the present application provides a wireless local area network communication system, which is similar to the principle of the wireless local area network communication method described in the second embodiment for solving the problem, and repeated details are not repeated.

In the wireless local area network communication system provided by the embodiment of the application, the central node in the wireless local area network can actively search the broadcast messages of other central nodes in the search interval, and the central node itself becomes a peripheral node when the broadcast messages of other central nodes are searched (namely, two or more central nodes exist in the wireless local area network), so that the number of the central nodes in the wireless local area network is reduced, and the peripheral nodes are ensured to be connected with the same central node to communicate with each other.

In an embodiment, when a central node searches for a broadcast message sent by another central node, the central node is configured to compare feature information of the central node with feature information of another central node that sends the broadcast message according to a preset priority determination rule, and when the central node is a disadvantaged party, the central node becomes a peripheral node.

In one embodiment, the central node is further configured to become a peripheral node upon receiving a feedback message including a stop-work request sent by a peripheral node.

EXAMPLE six

Based on the same inventive concept, the embodiment of the present application provides a wireless local area network communication system, which is similar to the principle of the wireless local area network communication method described in the third embodiment for solving the problem, and repeated details are not repeated.

In the wireless local area network communication system provided by the embodiment of the application, the peripheral nodes in the wireless local area network can actively search the broadcast messages of other central nodes in the search interval, and when the broadcast messages of other central nodes are searched (namely two or more central nodes exist in the wireless local area network), the peripheral nodes request the central nodes connected with the peripheral nodes to be changed into the peripheral nodes, so that the number of the central nodes in the wireless local area network is reduced, and the peripheral nodes are ensured to be connected with the same central node to further communicate with each other.

In an embodiment, when a peripheral node searches for a broadcast message sent by another central node, the peripheral node is configured to compare feature information of a central node connected to the peripheral node with feature information of another central node sending the broadcast message, and when the central node connected to the peripheral node is a disadvantaged party, send a feedback message including a stop request to the central node connected to the peripheral node at an uplink time interval of a communication interval, and the central node connected to the peripheral node becomes the peripheral node after receiving the stop request.

EXAMPLE seven

Based on the same inventive concept, the embodiments of the present application provide a wireless transceiver device, which is similar to the principle of the wireless local area network communication method described in the first embodiment for solving the problem, and repeated details are not repeated.

The wireless transceiving equipment comprises: an antenna, a radio frequency transceiver, a baseband data and protocol processor, a user interface, wherein,

the radio frequency transceiver is used for searching the broadcast message sent by the central node through the antenna in the searching time interval of the searching interval when the node is a peripheral node which is not connected with the central node;

The wireless transceiver device provided by the embodiment of the application can actively search the broadcast message of the central node in the search time interval of the search interval when being located at the peripheral node connected with the central node, and can change the broadcast message into the central node when the central node does not exist in the current wireless local area network, so that the communication of each node of the wireless local area network is maintained.

In one embodiment, the radio frequency transceiver is further configured to, when the wireless transceiver device is a central node, transmit a broadcast message including a stop-work message to a peripheral node via an antenna during a downlink period within a communication interval before the central node needs to stop working or no longer function as a central node or leave a working area.

In one embodiment, the search latency is randomly generated.

In one embodiment, the baseband data and protocol processor is further configured to determine whether the broadcast message is a duplicate message when the baseband data and protocol processor is used as a peripheral node according to a comparison between a sequence number in the broadcast message and a previously received sequence number; when the central node is used, whether the feedback message is a repeat message is determined according to the comparison between the sequence number and the characteristic information in the feedback message and the previously received sequence number and characteristic information.

In one embodiment, the search interval is greater than the communication interval, the search period in the search interval is greater than the uplink period and the downlink period in the communication interval, and division of the search interval and the communication interval has a non-zero remainder which is less than the difference between the search period and the uplink period or the downlink period.

Example eight

Based on the same inventive concept, the embodiment of the present application provides a wireless transceiver device, which is similar to the principle of the wireless local area network communication method described in the second embodiment to solve the problem, and repeated details are not repeated.

the radio frequency transceiver is used for searching broadcast messages sent by other central nodes through an antenna in the searching period of the searching interval;

the baseband data and protocol processor is used for changing the node into a peripheral node if the node is a central node when the broadcast messages sent by other central nodes are searched;

the radio frequency transceiver is further configured to receive a broadcast message through the antenna during a downlink time period within the communication interval, and transmit a feedback message through the antenna during an uplink time period within the communication interval.

According to the wireless transceiver device provided by the embodiment of the application, when the wireless transceiver device is used as a central node, broadcast messages of other central nodes can be actively searched in the search time interval of the search interval, and the wireless transceiver device itself becomes a peripheral node when the broadcast messages of other central nodes are searched (namely, two or more central nodes exist in the wireless local area network), so that the number of the central nodes in the wireless local area network is reduced, and each peripheral node is ensured to be connected with the same central node so as to communicate with each other.

In one embodiment, the broadcast message includes feature information of the central node; the baseband data and protocol processor is specifically configured to, when a broadcast message sent by another central node is searched, compare, according to a preset priority determination rule, feature information of the local central node with feature information of another central node that sends the broadcast message if the local node is the central node, and change the local central node into a peripheral node when the local central node is a disadvantaged party.

In one embodiment, the radio frequency transceiver is further configured to receive a feedback message including a stop request sent by a peripheral node when the local node is a central node; the baseband data and protocol processor is further configured to change the local central node to a peripheral node upon receiving a feedback message including a stop-work request sent by the peripheral node.

In one embodiment, when the search period of any node overlaps with the uplink period or the downlink period, the node selects and executes the search period, the uplink period or the downlink period according to the frequency of the valid data transmitted by the uplink period or received by the downlink period.

In one embodiment, the baseband data and protocol processor is further configured to determine whether the broadcast message is a duplicate message when acting as a peripheral node based on a comparison of a sequence number in the broadcast message with a previously received sequence number; when the central node is used, whether the feedback message is a repeat message is determined according to the comparison between the sequence number and the characteristic information in the feedback message and the previously received sequence number and characteristic information.

Example nine

Based on the same inventive concept, the embodiment of the present application provides a wireless transceiver device, which is similar to the principle of solving the problem of the wireless local area network communication method described in the third embodiment, and repeated descriptions are omitted here.

According to the wireless transceiver device provided by the embodiment of the application, when the wireless transceiver device is used as a peripheral node, broadcast messages of other central nodes can be actively searched in the search time interval of the search interval, and when the broadcast messages of other central nodes are searched (namely, two or more central nodes exist in the wireless local area network), the peripheral node requests the central node connected with the peripheral node to be changed into the peripheral node, so that the number of the central nodes in the wireless local area network is reduced, and the peripheral nodes are ensured to be connected with the same central node to further communicate with each other.

In one embodiment, the broadcast message includes feature information of the central node; and the baseband data and protocol processor is used for comparing the characteristic information of the central node connected with the local node with the characteristic information of other central nodes for sending the broadcast message if the local node is a peripheral node when the broadcast messages sent by other central nodes are searched, and controlling the radio frequency transceiver to send a feedback message comprising a work stop request to the central node connected with the local node through an antenna at an uplink time interval in a communication interval when the central node connected with the local node is a disadvantaged party.

Example ten

In order to facilitate the implementation of the present application, the embodiments of the present application use a lamp effect synchronization system as a specific example for illustration.

The lamp effect synchronization system of the embodiment of the application comprises: a central node, one or more peripheral nodes; the central node sends broadcast messages to the peripheral nodes through a preset broadcast channel, and the peripheral nodes receive the broadcast messages and send feedback messages to the central node through a preset feedback channel.

The broadcast message comprises a control message and data; the control message comprises the switching and switching of light effects, the used channel, the interval of broadcasting, the request for changing the local area network form, the number of peripheral nodes and the like; the data includes color, brightness, pattern, phase, etc. of the light effect.

The feedback message sent by the peripheral node comprises control message and data, wherein the control message comprises the switch and switching of light effect, the intensity of received signal, the quality of channel, the request for changing the form of local area network, and the like; the data includes color, brightness, pattern, phase, etc. of the light effect.

In the embodiment of the present application, each node (i.e., wireless transceiver device) includes an antenna, a radio frequency transceiver, a baseband data and protocol processor, and a user interface, where the user interface includes an LED array, keys, and a wireless control interface. Wherein the LED array may exhibit 8 light effect modes and 256 color matching modes. The communication interval is 22.5ms, the communication interval comprises two equally-spaced time periods, each time period is 625us, the first time period is a downlink time period, and the second time period is an uplink time period; the search interval is 100ms, and the search interval contains a search time interval which is 12.5 ms.

When a device attempts to join a local area network, it may become a central node or a peripheral node.

The central node searches other central nodes in the searching time period, and if the other central nodes are not searched, the central node continues to serve as the central node; if the search result is obtained, the peripheral node is selected to be the central node or the central node is maintained to be the peripheral node through a competition mechanism. The peripheral node judges whether the connection with the central node is still established, and if the connection is still maintained, the peripheral node continues to serve as the peripheral node; if not, searching other central nodes, and if the other central nodes are searched, serving as peripheral nodes of other central nodes; if not, selecting to be the central node.

The central node broadcasts a data packet of the message in the downlink period of each communication interval, the data packet is packaged by adopting a classic Bluetooth 2DH1 packet type and is sent on channels 0, 24 and 78 in a Bluetooth channel according to a Bluetooth frequency modulation mode. The data packet may include a bluetooth clock, lamp data, a serial number, a communication interval, a bluetooth address of the central node, a bluetooth channel used by the central node, etc. Wherein, the light effect data is obtained by the central node through a user interface, and comprises a light effect mode and a color. When the central node receives a command of updating the light effect through the user interface, the central node enables the LED array in the user interface to display a new light effect mode and color, and encapsulates the light effect data in a data packet sent by subsequent broadcasting and updates the serial number in the data packet.

The central node receives a data packet of the feedback message in an uplink period of each communication interval, the data packet is packaged by adopting a classic Bluetooth 2DH1 packet type, and the data packet is received on 16 channels, 32 channels and 48 channels in a Bluetooth channel according to a Bluetooth frequency modulation mode. The data packet can include lamp effect data, a serial number, a Bluetooth address of a peripheral node and the like, the central node records the Bluetooth address and the serial number, records the lamp effect data when the serial number or the Bluetooth address is different from the last record, and changes the lamp effect mode and the color displayed by the LED array in the user interface of the node according to the lamp effect data.

The central node searches data packets sent by other central nodes in the searching time interval of the searching interval and channels 0, 24 and 78 of the Bluetooth channel, if the data packets are searched, a competition mechanism is executed, namely, the Bluetooth address is compared with the Bluetooth address of the opposite node, the highest position of the address is compared with the lowest position of the address, and if a certain position of the Bluetooth address of the node is greater than the corresponding position of the Bluetooth address of the opposite node, the node is an advantageous party; if a certain bit of the Bluetooth address of the node is smaller than the corresponding bit of the Bluetooth address of the other party, the node is a disadvantaged party; if a certain bit of the Bluetooth address of the node is equal to the corresponding bit of the Bluetooth address of the other party, the lower bits in the Bluetooth address are continuously compared. By contrast, if the node becomes the dominant party, the node continues to serve as the central node; if the node becomes a disadvantaged party, the search is stopped, the transmission time of the packet is recorded, the bluetooth clock, the communication interval, the bluetooth address, the used channel, and the like included in the packet are recorded, and a notification that the node does not function as a central node is transmitted in the packet transmitted in the next 400 ms. After 400ms, the central node is not used, but used as a peripheral node, and the data packet sent by the opposite node is continuously received according to the recorded Bluetooth clock, communication interval, Bluetooth address and use channel.

The peripheral node receives data packets on channels 0, 24 and 78 in the Bluetooth channel according to a Bluetooth frequency hopping mode in the downlink time interval of each communication interval, records the Bluetooth address contained in the data packets if the data packets are received, and considers the data packets as valid packets if the Bluetooth address is the same as the last recorded data packet; otherwise, it is considered as an invalid packet. And recording the serial number of the effective packet, recording the light effect data if the serial number is different from the last recorded serial number, and changing the light effect mode and color displayed by the LED array in the user interface of the node according to the light effect data.

If the peripheral node can not receive the data packet in the downlink time interval continuously for 5s, the peripheral node does not execute the downlink time interval and the uplink time interval in the communication interval any longer, but executes the search time interval in the search interval instead. The peripheral node attempts to receive the data packet on channels 0, 24, 78 in turn during the search period, using the same search channel for each search interval. And the peripheral node randomly generates a search time of 10-15 s during searching, and if the data packet is searched in the search time, the peripheral node continuously receives the data packet transmitted by the opposite node according to the transmission time of the packet, the Bluetooth clock, the communication interval, the Bluetooth address and the use channel contained in the packet. And if the data packet cannot be searched within the searching time, the data packet is changed to serve as the central node.

The peripheral node sends a data packet of the feedback message in the uplink period in each communication interval, the data packet being encapsulated with a classic bluetooth 2DH1 packet type. The feedback packet is transmitted on 16, 32, 48 of the bluetooth channels according to a bluetooth frequency hopping scheme. The content of the feedback packet includes light effect data, serial number, bluetooth address of peripheral node, etc.

The peripheral node may obtain a command to update the light effect from the user interface, the command including a new light effect mode and color. If the command is received, the LED array in the user interface is enabled to display a new light effect mode and color, and the light effect data is packaged in the feedback message sent later and the serial number in the feedback message is updated.

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. For example, the embodiments of the present application may be complete software embodiments implemented by using computer languages such as object-oriented programming language Java and interpreted scripting language JavaScript.

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.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the present application.

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

1. A wireless local area network communication method, comprising:

if the broadcast message sent by the central node is not searched in the search waiting time, the peripheral node becomes the central node, the broadcast message is sent in the downlink time interval in the communication interval, and the feedback message is received in the uplink time interval in the communication interval;

if the broadcast message sent by the central node is searched within the search waiting time, the peripheral node establishes connection with the central node according to the broadcast message; after the peripheral node is connected with the central node, when the peripheral node searches broadcast messages sent by other central nodes, the peripheral node sends a feedback message including a work stopping request to the central node connected with the peripheral node; or after the peripheral node is connected with the central node, when the peripheral node searches broadcast messages sent by other central nodes, the peripheral node compares the characteristic information of the central node connected with the peripheral node with the characteristic information of other central nodes sending the broadcast messages, and when the central node connected with the peripheral node is in a disadvantaged side, the peripheral node sends a feedback message including a work stop request to the central node connected with the peripheral node.

2. The method of claim 1, wherein the searching for the broadcast message sent by the central node during the search period of the search interval for the peripheral node not connected to the central node comprises:

3. The method according to claim 1 or 2, wherein when the search period of any node overlaps with the uplink period or the downlink period, the node selects the search period, the uplink period or the downlink period according to the frequency of the valid data transmitted by the uplink period and/or received by the downlink period; the higher the frequency of the effective data contained in the uplink time period and/or the downlink time period is, the smaller the probability of executing the search time period during random selection is; conversely, the greater the probability of performing a search period; and/or the presence of a gas in the gas,

the broadcast message of the central node comprises a serial number, the feedback message of the peripheral node comprises the serial number and characteristic information, and when the peripheral node receives the broadcast message, whether the broadcast message is a repeated message is determined according to the comparison between the serial number in the broadcast message and the previously received serial number; when the central node receives the feedback message, whether the feedback message is a repeated message is determined according to the comparison between the serial number and the characteristic information in the feedback message and the previously received serial number and characteristic information; and/or the presence of a gas in the gas,

the feedback message of the peripheral node comprises the characteristic information of the node, the broadcast message of the central node comprises the number of the peripheral nodes, and the number of the peripheral nodes is determined according to the number of different characteristic information in the feedback message; the peripheral nodes adjust the minimum sending interval of the feedback messages according to the number of the peripheral nodes; or, the peripheral node adjusts the minimum sending interval of the node for sending the feedback message according to the data volume to be sent by the node; and/or the presence of a gas in the gas,

the search interval is larger than the communication interval, the search time interval in the search interval is larger than the uplink time interval and the downlink time interval in the communication interval, a division is carried out between the search interval and the communication interval to obtain a non-zero remainder, and the remainder is smaller than the difference between the search time interval and the uplink time interval or the downlink time interval.

4. A wireless local area network communication method, comprising:

when the central node searches broadcast messages sent by other central nodes, the central node becomes a peripheral node, receives the broadcast messages in a downlink time interval in a communication interval, and sends feedback messages in an uplink time interval in the communication interval;

after the central node receives a work stopping request sent by a peripheral node, the central node becomes the peripheral node; the peripheral node sends a work stopping request to the central node after searching broadcast messages sent by other central nodes; or the work stopping request is sent to the central node when the peripheral node determines that the central node is a disadvantaged party by comparing the characteristic information of the central node with the characteristic information of other central nodes after searching broadcast messages sent by other central nodes.

5. The method according to claim 4, wherein the broadcast message sent by the central node includes the characteristic information of the central node; when the central node searches for the broadcast messages sent by other central nodes, the central node becomes a peripheral node, including: when a central node searches broadcast messages sent by other central nodes, the central node compares the characteristic information of the central node with the characteristic information of other central nodes sending the broadcast messages according to a preset priority judgment rule, and when the central node is in a disadvantage side, the central node is changed into a peripheral node;

the method further comprises the following steps: and when a feedback message which is sent by the peripheral node and comprises a work stop request is received, the central node becomes the peripheral node.

6. The method according to claim 4 or 5, wherein when the search period of any node overlaps with the uplink period or the downlink period, the node selects the search period, the uplink period or the downlink period according to the frequency of the valid data transmitted by the uplink period and/or received by the downlink period; the higher the frequency of the effective data contained in the uplink time period and/or the downlink time period is, the smaller the probability of executing the search time period during random selection is; conversely, the greater the probability of performing a search period; and/or the presence of a gas in the gas,

7. A wireless local area network communication method, comprising:

when a peripheral node searches broadcast messages sent by other central nodes, the peripheral node sends a feedback message including a work stop request to the central node connected with the peripheral node in an uplink period of a communication interval; the central node becomes a peripheral node after receiving the work stopping request;

the search interval is larger than the communication interval, the search time period in the search interval is larger than the uplink time period and the downlink time period in the communication interval, and a remainder is obtained by dividing the search interval and the communication interval and is smaller than the difference between the search time period and the uplink time period or the downlink time period.

8. The method according to claim 7, wherein the broadcast message sent by the central node includes the characteristic information of the central node; when the peripheral node searches broadcast messages sent by other central nodes, the peripheral node sends a feedback message including a work stop request to the central node connected with the peripheral node in an uplink period of a communication interval, and the method comprises the following steps:

9. The method according to claim 7 or 8, wherein when the search period of any node overlaps with the uplink period or the downlink period, the node selects the search period, the uplink period or the downlink period according to the frequency of the valid data transmitted by the uplink period and/or received by the downlink period; the higher the frequency of the effective data contained in the uplink time period and/or the downlink time period is, the smaller the probability of executing the search time period during random selection is; conversely, the greater the probability of performing a search period; and/or the presence of a gas in the gas,

the feedback message of the peripheral node comprises the characteristic information of the node, the broadcast message of the central node comprises the number of the peripheral nodes, and the number of the peripheral nodes is determined according to the number of different characteristic information in the feedback message; the peripheral nodes adjust the minimum sending interval of the feedback messages according to the number of the peripheral nodes; or, the peripheral node adjusts the minimum sending interval of the node for sending the feedback message according to the data volume to be sent by the node.

10. A wireless local area network communication system, comprising: a central node and a peripheral node, wherein,

if the broadcast message sent by the central node is not searched in the search waiting time, the peripheral node becomes the central node, the broadcast message is sent in the downlink time interval in the communication interval, the feedback message is received in the uplink time interval in the communication interval, and the broadcast message sent by other central nodes is searched in the search time interval;

if the broadcast message sent by the central node is searched within the search waiting time, the peripheral node establishes connection with the central node according to the broadcast message; after the peripheral node is connected with the central node, when the peripheral node searches broadcast messages sent by other central nodes, the peripheral node sends a feedback message including a work stopping request to the central node connected with the peripheral node; or after the peripheral node is connected with the central node, when the peripheral node searches for the broadcast message sent by other central nodes, the peripheral node compares the characteristic information of the central node connected with the peripheral node with the characteristic information of other central nodes sending the broadcast message, and when the central node connected with the peripheral node is a disadvantaged party, the peripheral node sends a feedback message including a work stop request to the central node connected with the peripheral node.

11. The system of claim 10, wherein the central node is further configured to send a broadcast message including a stop-work message to the peripheral nodes during a downlink period within the communication interval before needing to stop working or no longer function as a central node or leave the working area.

12. The system according to claim 10 or 11, wherein when the search period of any node overlaps with the uplink period or the downlink period, the node selects the search period, the uplink period or the downlink period according to the frequency of the valid data transmitted by the uplink period and/or received by the downlink period; the higher the frequency of the effective data contained in the uplink time period and/or the downlink time period is, the smaller the probability of executing the search time period during random selection is; conversely, the greater the probability of performing a search period; and/or the presence of a gas in the gas,

the feedback message of the peripheral node comprises the characteristic information of the node, the broadcast message of the central node comprises the number of the peripheral nodes, and the number of the peripheral nodes is determined according to the number of different characteristic information in the feedback message; the peripheral nodes adjust the minimum sending interval of the feedback messages according to the number of the peripheral nodes; or, the peripheral node adjusts the minimum sending interval of the node for sending the feedback message according to the data volume to be sent by the node; and/or the presence of a gas in the atmosphere,

13. A wireless local area network communication system, comprising: a central node and a peripheral node, wherein,

14. The system according to claim 13, wherein when a central node searches for a broadcast message sent by another central node, the central node is specifically configured to compare feature information of the central node with feature information of another central node that sends the broadcast message according to a preset priority determination rule, and when the central node is a disadvantaged party, the central node becomes a peripheral node; the central node is further configured to become a peripheral node upon receiving a feedback message including a stop-work request sent by a peripheral node.

15. The system according to claim 13 or 14, wherein when the search period of any node overlaps with the uplink period or the downlink period, the node selects the search period, the uplink period or the downlink period according to the frequency of the valid data transmitted by the uplink period and/or received by the downlink period; the higher the frequency of the effective data contained in the uplink time period and/or the downlink time period is, the smaller the probability of executing the search time period during random selection is; conversely, the greater the probability of performing a search period; and/or the presence of a gas in the gas,

the search interval is larger than the communication interval, the search time interval in the search interval is larger than the uplink time interval and the downlink time interval in the communication interval, a remainder is obtained by dividing the search interval and the communication interval, and the remainder is smaller than the difference between the search time interval and the uplink time interval or the downlink time interval.

16. A wireless local area network communication system, comprising: a central node and a peripheral node, wherein,

when a peripheral node searches broadcast messages sent by other central nodes, the peripheral node is used for sending a feedback message including a work stopping request to the central node in an uplink period of a communication interval; the central node becomes a peripheral node after receiving the work stopping request;

17. The system according to claim 16, wherein when a peripheral node searches for a broadcast message sent by another central node, the peripheral node is specifically configured to compare the feature information of the central node connected to the peripheral node with the feature information of another central node that sends the broadcast message, and when the central node connected to the peripheral node is a disadvantaged party, send a feedback message including a stop request to the central node connected to the peripheral node in the uplink period of the communication interval.

18. The system according to claim 16 or 17, wherein when the search period of any node overlaps with the uplink period or the downlink period, the node selects the search period, the uplink period or the downlink period according to the frequency of the valid data transmitted by the uplink period and/or received by the downlink period; the higher the frequency of the effective data contained in the uplink time period and/or the downlink time period is, the smaller the probability of executing the search time period during random selection is; conversely, the greater the probability of performing a search period; and/or the presence of a gas in the gas,

19. A wireless transceiving device, comprising: an antenna, a radio frequency transceiver, a baseband data and protocol processor, a user interface, wherein,

the radio frequency transceiver is further used for sending broadcast messages through the antenna in a downlink time interval in a communication interval, receiving feedback messages through the antenna in an uplink time interval in the communication interval, and searching the broadcast messages sent by other central nodes in a searching time interval;

the radio frequency transceiver is further configured to: after the node is connected with the central node, when the broadcast messages sent by other central nodes are searched, sending a feedback message including a work stopping request to the central node connected with the node; or after the node is connected with the central node, when the broadcast messages sent by other central nodes are searched, if the node determines that the connected central node is a disadvantaged party after comparing the characteristic information of the connected central node with the characteristic information of the other central nodes, sending a feedback message including a work stop request to the central node connected with the node.

20. The device of claim 19, wherein the radio frequency transceiver is further configured to send a broadcast message including a stop-work message to peripheral nodes via an antenna during a downlink period in a communication interval before the central node needs to stop working or no longer function as a central node or leave a working area when the wireless transceiver device is a central node.

21. The apparatus of claim 19 or 20, wherein the baseband data and protocol processor is configured to select the search period, the uplink period, or the downlink period to be performed according to a frequency of valid data transmitted in the uplink period or received in the downlink period when the search period overlaps with the uplink period or the downlink period; the higher the frequency of the effective data contained in the uplink time period and/or the downlink time period is, the smaller the probability of executing the search time period during random selection is; conversely, the greater the probability of performing a search period; and/or the presence of a gas in the gas,

the baseband data and protocol processor is further configured to determine whether the broadcast message is a duplicate message according to a comparison of a sequence number in the broadcast message with a previously received sequence number when the baseband data and protocol processor is used as a peripheral node; when the central node is used, whether the feedback message is a repeated message is determined according to the comparison between the serial number and the characteristic information in the feedback message and the previously received serial number and characteristic information; and/or the presence of a gas in the gas,

when the received broadcast message is used as a peripheral node, the feedback message contains the characteristic information of the node, and the baseband data and protocol processor is further used for adjusting the minimum sending interval of the feedback message according to the number of the peripheral nodes in the received broadcast message; the number of peripheral nodes in the broadcast message is determined by the central node according to the characteristic information in the feedback message of each peripheral node; or, when the node is used as a peripheral node, the baseband data and protocol processor is further configured to adjust a minimum sending interval at which the node sends a feedback message according to a data amount to be sent by the node; and/or the presence of a gas in the gas,

the search interval is larger than the communication interval, the search time interval in the search interval is larger than the uplink time interval and the downlink time interval in the communication interval, and division is carried out on the search interval and the communication interval to obtain a remainder which is smaller than the difference between the search time interval and the uplink time interval or the downlink time interval.

22. A wireless transceiving device, comprising: an antenna, a radio frequency transceiver, a baseband data and protocol processor, a user interface, wherein,

the radio frequency transceiver is further used for receiving broadcast messages through an antenna in a downlink time period in a communication interval and sending feedback messages through the antenna in an uplink time period in the communication interval when the node is a peripheral node;

the baseband data and protocol processor is further configured to: after the radio frequency transceiver receives a work stopping request sent by a peripheral node, the radio frequency transceiver changes the local node into the peripheral node; the peripheral node sends a work stopping request to the local node after searching broadcast messages sent by other central nodes; or, the work stop request is sent to the peripheral node when the peripheral node determines that the peripheral node is a disadvantaged party by comparing the feature information of the peripheral node with the feature information of the other central nodes after searching the broadcast messages sent by the other central nodes.

23. The apparatus of claim 22, wherein the broadcast message comprises feature information of the central node; the baseband data and protocol processor is specifically used for comparing the characteristic information of the central node with the characteristic information of other central nodes for sending the broadcast message according to a preset priority judgment rule when the broadcast message sent by other central nodes is searched, and changing the central node into a peripheral node when the central node is in a disadvantage side;

the radio frequency transceiver is further used for receiving a feedback message which is sent by a peripheral node and comprises a work stopping request when the node is a central node; the baseband data and protocol processor is further configured to change the local central node to a peripheral node upon receiving a feedback message including a stop-work request sent by the peripheral node.

24. The device of claim 22 or 23, wherein the baseband data and protocol processor is configured to select the search period, the uplink period, or the downlink period according to a frequency of valid data transmitted in the uplink period or received in the downlink period when the search period overlaps with the uplink period or the downlink period; the higher the frequency of the effective data contained in the uplink time period and/or the downlink time period is, the smaller the probability of executing the search time period is when randomly selecting; conversely, the greater the probability of performing a search period; and/or the presence of a gas in the gas,

when the received broadcast message is used as a peripheral node, the feedback message contains the characteristic information of the node, and the baseband data and protocol processor is further used for adjusting the minimum sending interval of the feedback message according to the number of the peripheral nodes in the received broadcast message; the number of peripheral nodes in the broadcast message is determined by the central node according to the characteristic information in the feedback message of each peripheral node; or, when the node is used as a peripheral node, the baseband data and protocol processor is further configured to adjust a minimum sending interval at which the node sends a feedback message according to a data amount to be sent by the node; and/or the presence of a gas in the atmosphere,

25. A wireless transceiving device, comprising: an antenna, a radio frequency transceiver, a baseband data and protocol processor, a user interface, wherein,

the baseband data and protocol processor is used for controlling the radio frequency transceiver to send a feedback message including a work stopping request to a central node connected with the node through an antenna in an uplink period of a communication interval when a broadcast message sent by other central nodes is searched;

26. The apparatus of claim 25, wherein the broadcast message comprises feature information of the central node; the baseband data and protocol processor is used for comparing the characteristic information of the central node connected with the node with the characteristic information of other central nodes sending the broadcast message when the broadcast message sent by other central nodes is searched, and controlling the radio frequency transceiver to send a feedback message including a work stopping request to the central node connected with the node through an antenna in an uplink period of a communication interval when the central node connected with the node is a disadvantaged party.

27. The device of claim 25 or 26, wherein the baseband data and protocol processor is configured to select the search period, the uplink period, or the downlink period to be performed according to a frequency of valid data transmitted in the uplink period or received in the downlink period when the search period overlaps with the uplink period or the downlink period; the higher the frequency of the effective data contained in the uplink time period and/or the downlink time period is, the smaller the probability of executing the search time period is when randomly selecting; conversely, the greater the probability of performing a search period; and/or the presence of a gas in the gas,

the baseband data and protocol processor is further configured to determine whether the broadcast message is a duplicate message according to a comparison of a sequence number in the broadcast message with a previously received sequence number when the baseband data and protocol processor is used as a peripheral node; when the central node is used, whether the feedback message is a repeated message is determined according to the comparison between the serial number and the characteristic information in the feedback message and the previously received serial number and characteristic information; and/or the presence of a gas in the atmosphere,

when the received broadcast message is used as a peripheral node, the feedback message contains the characteristic information of the node, and the baseband data and protocol processor is further used for adjusting the minimum sending interval of the feedback message according to the number of the peripheral nodes in the received broadcast message; the number of peripheral nodes in the broadcast message is determined by the central node according to the characteristic information in the feedback message of each peripheral node; or, when the node is used as a peripheral node, the baseband data and protocol processor is further configured to adjust a minimum transmission interval at which the node transmits the feedback message according to the amount of data to be transmitted by the node.