A connection method between wireless network devices and a wireless network communication system

Abstract

The present application relates to the technical field of network communication, in particular to a connection method between wireless network devices and a wireless network communication system. The connection method comprises the following steps: S1, a first wireless network device sends a message carrying information of maximum transmission power and information of actual transmission power to a second wireless network device in a network; S2, the first wireless network device detects the channel quality between the second wireless network device, and calculates the actual channel quality based on the actual transmission power information based on the detection result and the actual transmission power corresponding to the second wireless network device, and the first wireless network device selects the second wireless network device for connection based on the actual channel quality. The present application provides a connection method between wireless network devices, which avoids the problem of mis-switching connection between devices after power adjustment of wireless network devices in a wireless mesh network.

Description

Technical Field

[0001] This invention relates to the field of network communication technology, and more specifically to a method for connecting wireless network devices and a wireless network communication system. Background Technology

[0002] In the currently deployed Time Division Duplex (TDD-MESH) wireless mesh networks, in order to ensure interconnection between nodes, network devices generally use full-power transmission. On the one hand, this increases device power consumption and heat generation, shortening device operating time; on the other hand, when two adjacent wireless network devices use close or overlapping frequency bands, they always transmit at maximum power, which will cause significant interference between them.

[0003] Therefore, power control is required for wireless network devices to control their actual transmission power. However, after reducing the transmission power of wireless network devices, the channel quality between devices will decrease to some extent. Wireless mesh networks always switch connections between wireless network devices based on the channel quality detection results directly detected by the detection devices. Therefore, if the traditional direct detection of channel quality between devices is used as the only reference indicator, without considering the gain effect brought by reducing the transmission power of wireless network devices to calculate the actual channel quality between devices, it will lead to false handovers, frequent handovers, or few devices maintaining connections with wireless network devices after the transmission power is reduced, thus causing the impact of false handovers between devices. Summary of the Invention

[0004] The purpose of this invention is to provide a method for connecting wireless network devices, thereby solving the above-mentioned technical problems;

[0005] Another objective of this invention is to provide a wireless network communication system that solves the above-mentioned technical problems.

[0006] The technical problem solved by this invention can be achieved by the following technical solutions:

[0007] A method for connecting wireless network devices, comprising,

[0008] Step S1: A first wireless network device sends a message containing information about the maximum transmission power and the actual transmission power to a second wireless network device in the network.

[0009] In step S2, the first wireless network device detects the channel quality between the second wireless network device, and calculates the actual channel quality based on the detection result and the actual transmit power corresponding to the second wireless network device. The first wireless network device then selects the second wireless network device to connect based on the actual channel quality.

[0010] Preferably, in step S1, the first wireless network device and the second wireless network device form a network based on the maximum transmission power and the actual transmission power. The first wireless network device and the second wireless network device determine the actual transmission power through negotiation, including...

[0011] Step S11: The first wireless network device receives the message data sent by the second wireless network device;

[0012] Step S12: The first wireless network device evaluates the error rate of the packet data, determines whether the error rate of the packet data is lower than a set value, and sends a power adjustment command to the second wireless network device.

[0013] Step S13: The second wireless network device adjusts the transmission power of the packet data based on the power adjustment command.

[0014] Preferably, in step S12, if the error rate of the message data is lower than the set value, the first wireless network device sends a power adjustment command to reduce the power; if the error rate of the message data is higher than the set value, the first wireless network device sends a power adjustment command to increase the power.

[0015] In step S13, the second wireless network device reduces the transmission power of the next packet data based on the power adjustment command for power down, and increases the transmission power of the next packet data based on the power adjustment command for power up.

[0016] Preferably, in step S1, if the first wireless network device is connected to multiple second wireless network devices, the maximum value among the actual transmission powers determined by each of the second wireless network devices is selected as the actual transmission power, or the first wireless network device switches between the actual transmission powers of each of the second wireless network devices and transmits data to each of the second wireless network devices at the corresponding power.

[0017] Preferably, in step S3, the signal-to-noise ratio of the actual channel quality is equal to the signal-to-noise ratio between the first wireless network device and the second wireless network device plus the signal-to-noise ratio corresponding to the difference between the maximum transmit power and the actual transmit power.

[0018] Preferably, the actual transmission power is less than the maximum transmission power.

[0019] A wireless network communication system for implementing the connection method between wireless network devices includes multiple wireless access devices, the wireless network devices including a first wireless network device and a second wireless network device, each of the wireless access devices having a set power transmission cycle, wherein a power transmission cycle includes multiple first power transmission periods operating at the actual transmission power and multiple second power transmission periods operating at the maximum transmission power.

[0020] Preferably, the wireless network devices operating at maximum transmit power are mutually visible to each other.

[0021] Preferably, the first power transmission period and the second power transmission period have the same duration.

[0022] Preferably, the duration of the first power transmission period and the second power transmission period is 1ms-10000000ms.

[0023] The beneficial effects of the present invention are as follows: By adopting the above technical solution, the present invention provides a connection method between wireless network devices, thereby avoiding the problem of accidental switching of connections between devices after the power adjustment of wireless network devices in a wireless mesh network. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the steps of a method for connecting wireless network devices in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of step S1 in an embodiment of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0029] A method for connecting wireless network devices, such as Figure 1As shown, including,

[0030] Step S1: A first wireless network device sends a message containing information about the maximum transmission power and the actual transmission power to a second wireless network device in the network.

[0031] In step S2, the first wireless network device detects the channel quality between the second wireless network device, and calculates the actual channel quality based on the actual transmission power information corresponding to the second wireless network device based on the detection result and the actual transmission power of the second wireless network device. The first wireless network device selects the second wireless network device to connect based on the actual channel quality.

[0032] Specifically, this invention avoids the problem in wireless mesh networks (MESH) where wireless network devices always transmit signals at maximum power. While wireless network devices negotiate and determine the actual transmission power based on the required bandwidth, reducing the transmission power to the actual power also reduces the monitoring and detection results of the channel quality of other connected wireless network devices. Wireless network devices typically prioritize connecting to other wireless network devices with better communication quality, leading to false handovers. This invention, in evaluating communication quality, includes the signal-to-noise ratio (SNR) corresponding to the difference between the maximum and actual transmission power, in addition to the detection results. This allows for the calculation of the actual communication quality after power reduction, thus avoiding false handovers and minimizing the impact of power adjustments on wireless routing.

[0033] In a preferred embodiment, such as Figure 2 As shown, in step S1, the first wireless network device and the second wireless network device form a network based on the maximum transmission power and the actual transmission power. The first wireless network device and the second wireless network device determine the actual transmission power through negotiation, including...

[0034] Step S11: The first wireless network device receives the message data sent by the second wireless network device;

[0035] Step S12: The first wireless network device evaluates the error rate of the packet data, determines whether the error rate of the packet data is lower than the set value, and sends a power adjustment command to the second wireless network device.

[0036] Step S13: The second wireless network device adjusts the transmission power of the packet data based on the power adjustment command.

[0037] In a preferred embodiment, in step S12, if the error rate of the packet data is lower than a set value, the first wireless network device sends a power adjustment command to reduce power; if the error rate of the packet data is higher than the set value, the first wireless network device sends a power adjustment command to increase power.

[0038] In step S13, the second wireless network device reduces the transmission power of the next packet data based on the power adjustment command of power down, and increases the transmission power of the next packet data based on the power adjustment command of power up.

[0039] Specifically, the present invention can use a common closed-loop power control method to determine the actual transmission power. This embodiment takes the connection between a first wireless network device A and a second wireless network device B as an example. The first wireless network device A sends packet data to the second wireless network device B; the second wireless network device B receives the packet data from the first wireless network device A and evaluates the error rate of the data packet; if the error rate is lower than a set value, the second wireless network device B sends a power reduction command to device A; if the error rate is higher than the set value, the second wireless network device B sends a power increase command to the first wireless network device A; the first wireless network device A receives the power reduction command or power increase command from the second wireless network device B, and based on the power reduction command, reduces the transmission power of the next packet data; and based on the power increase command, increases the transmission power of the next packet data.

[0040] In a preferred embodiment, if the first wireless network device is connected to multiple second wireless network devices, the maximum value among the actual transmission powers determined by each second wireless network device is selected as the actual transmission power, or the first wireless network device switches between the actual transmission powers of each second wireless network device and transmits data to each second wireless network device at the corresponding power.

[0041] Specifically, if a wireless network device communicates simultaneously with multiple other wireless network devices, the maximum value negotiated with all the devices is selected as the actual transmission power. Alternatively, the power can be quickly adjusted based on the actual transmission power determined by each of the second wireless network devices, allowing data to be transmitted at a different power for each device.

[0042] In a preferred embodiment, in step S3, the signal-to-noise ratio of the actual communication quality is the signal-to-noise ratio between the first wireless network device and the second wireless network device obtained by detection, plus the signal-to-noise ratio corresponding to the difference between the maximum transmission power and the actual transmission power.

[0043] Specifically, when evaluating communication quality, this invention, in addition to the detection results, also calculates the signal-to-noise ratio (SNR) corresponding to the difference between the maximum transmit power and the actual transmit power. This allows for the calculation of the actual communication quality after power reduction, thus avoiding false handovers and minimizing the impact of power adjustments on wireless routing. For example, if a first wireless network device A calculates the SNR of the wireless signal from a second wireless network device B to be 15dB based on the received signal, and the second wireless network device B has a maximum transmit power of 30dBm and an actual transmit power of 27dBm, then the SNR of the actual communication quality corresponding to the second wireless network device B during routing calculation is: 15 + (30 - 27) = 18dB. Based on the received signal from the second wireless network device C, device A calculates that the signal-to-noise ratio (SNR) of the wireless signal from the second wireless network device B is 16dB. Meanwhile, the second wireless network device C transmits the signal at a maximum transmission power of 30dBm. If the method provided in this invention is not followed, the first wireless network device A will preferentially select the second wireless network device C, which has a higher detected communication quality of 16dB, for switching connection. This invention, preferably based on this, includes the SNR corresponding to the difference between the maximum transmission power and the actual transmission power in the calculation, thereby calculating the actual communication quality after considering the power reduction. Since the calculated actual communication quality corresponding to the second wireless network device B is 18dB, no switching is required, thus avoiding the impact of power adjustment on the wireless router.

[0044] Of course, different models of wireless network devices have different signal-to-noise ratios corresponding to different signal transmission powers, and all of these should be included within the scope of protection of this invention.

[0045] In a preferred embodiment, the actual transmit power is less than the maximum transmit power.

[0046] A wireless network communication system is provided for implementing a connection method between wireless network devices in any embodiment. The system includes multiple wireless access devices, including a first wireless network device and a second wireless network device. Each wireless access device has a set power transmission cycle, which includes multiple first power transmission periods operating at actual transmission power and multiple second power transmission periods operating at maximum transmission power.

[0047] Specifically, in this invention, the transmission power of the wireless network device is adjusted according to a fixed periodic pattern. The periodic pattern is divided into two time periods: a first power transmission period operating at the actual transmission power and a second power transmission period operating at the maximum transmission power; during the second power transmission period, the power control process is turned off, and transmission is always at the maximum power; during the first power transmission period, the power control process is enabled, and transmission is performed using the actual transmission power negotiated by the wireless network device with other wireless network devices.

[0048] In a preferred embodiment, wireless network devices operating at maximum transmit power are visible to each other.

[0049] In a preferred embodiment, the first power transmission period and the second power transmission period have the same duration.

[0050] In one specific embodiment, an example of a periodic pattern is: 101001; where 1 represents a first power transmission period and 0 represents a continuous second power transmission period, with the timing arranged as follows:

[0051] Suppose that wireless network devices become invisible to each other after their transmission power is reduced due to power control, and the initial power transmission periods of each wireless network device are random. Therefore, two wireless network devices need to be simultaneously at their maximum transmission power to become visible again and establish synchronization, as shown in Table 1. Thus, the time required to establish a connection may vary depending on the following scenarios:

[0052] B 1 0 1 0 0 1 C 1 0 1 0 0 1 D 1 0 1 0 0 1 E 1 0 1 0 0 1 F 1 0 1 0 0 1 G 1 0 1 0 0 1

[0053] Table 1

[0054] Since the second wireless network device B and the first wireless network device A have the same first power transmission period within the same time unit, a connection can be established when the second wireless network device B is in the first time unit. The second wireless network device C and the first wireless network device A are in sequence with a time unit difference. As can be seen from Table 1, when the second wireless network device C is in the fourth time unit, the second wireless network device C and the first wireless network device A are both at 0, that is, both are in the maximum power transmission state. At this time, the second wireless network device C and the first wireless network device A are visible to each other and establish a connection. Similarly, when the second wireless network device D is in the second time unit, the second wireless network device E is in the second time unit, the second wireless network device F is in the fourth time unit, and the second wireless network device G is in the fifth time unit, they are both at 0, that is, both are in the maximum power transmission state, thus establishing a connection with the first wireless network device A. After the connection is established, the two devices adjust their transmission power to keep the wireless link always available.

[0055] In a preferred embodiment, the duration of the first power transmission period and the second power transmission period is 1ms-10,000,000ms. The duration of the power adjustment time unit is determined according to the specific implementation of the device; in this embodiment, it can be 10ms, or a longer time such as 1s, for example, 10s.

[0056] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for connecting wireless network devices, characterized in that, include, Step S1: A first wireless network device sends a message containing information about the maximum transmission power and the actual transmission power to a second wireless network device in the network. Step S2: The first wireless network device detects the channel quality between the second wireless network device, and calculates the actual channel quality based on the actual transmission power information based on the detection result and the actual transmission power corresponding to the second wireless network device. The first wireless network device selects the second wireless network device to connect based on the actual channel quality. In step S3, the signal-to-noise ratio of the actual channel quality is equal to the signal-to-noise ratio between the first wireless network device and the second wireless network device plus the signal-to-noise ratio corresponding to the difference between the maximum transmit power and the actual transmit power.

2. The connection method between wireless network devices according to claim 1, characterized in that, In step S1, the first wireless network device and the second wireless network device form a network based on the maximum transmission power and the actual transmission power. The first wireless network device and the second wireless network device determine the actual transmission power through negotiation, including... Step S11: The first wireless network device receives the message data sent by the second wireless network device; Step S12: The first wireless network device evaluates the error rate of the packet data, determines whether the error rate of the packet data is lower than a set value, and sends a power adjustment command to the second wireless network device. Step S13: The second wireless network device adjusts the transmission power of the packet data based on the power adjustment command.

3. The connection method between wireless network devices according to claim 2, characterized in that, In step S12, if the error rate of the message data is lower than the set value, the first wireless network device sends a power adjustment command to reduce the power; if the error rate of the message data is higher than the set value, the first wireless network device sends a power adjustment command to increase the power. In step S13, the second wireless network device reduces the transmission power of the next packet data based on the power adjustment command for power down, and increases the transmission power of the next packet data based on the power adjustment command for power up.

4. The connection method between wireless network devices according to claim 2, characterized in that, In step S1, if the first wireless network device is connected to multiple second wireless network devices, the maximum value among the actual transmission powers determined by each of the second wireless network devices is selected as the actual transmission power, or the first wireless network device switches between the actual transmission powers of each of the second wireless network devices and transmits data to each of the second wireless network devices at the corresponding power.

5. The connection method between wireless network devices according to claim 1, characterized in that, The actual transmission power is less than the maximum transmission power.

6. A wireless network communication system for implementing the connection method between wireless network devices as described in any one of claims 1-5, characterized in that, The system includes multiple wireless access devices, including a first wireless network device and a second wireless network device. Each wireless access device has a set power transmission cycle, and each power transmission cycle includes multiple first power transmission periods operating at the actual transmission power and multiple second power transmission periods operating at the maximum transmission power.

7. The wireless network communication system according to claim 6, characterized in that, The wireless network devices operating at maximum transmit power are visible to each other.

8. The wireless network communication system according to claim 6, characterized in that, The first power transmission period and the second power transmission period have the same duration.

9. The wireless network communication system according to claim 8, characterized in that, The duration of the first power transmission period and the second power transmission period is 1ms-10,000,000ms.

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