CN106792954B - Bluetooth and Wifi switching method based on environment perception and transmission equipment - Google Patents

Abstract

The invention discloses a Bluetooth and Wifi switching method and transmission equipment based on environment perception, which comprises the following steps: s1, obtaining environmental parameters of Bluetooth equipment, judging whether the Bluetooth equipment meets the data transmission requirement, if so, jumping to a step S2, otherwise, jumping to a step S4; s2, predicting transmission data flow, calculating the transmission data rate of the transmission data flow, and jumping to the step S3 when the transmission data rate is smaller than a preset switching threshold value, or jumping to the step S4; s3, data transmission is carried out through the Bluetooth equipment; and S4, switching the transmission equipment from the Bluetooth equipment to Wifi equipment, and transmitting data through the Wifi equipment. The invention can automatically select Bluetooth or Wifi for data transmission according to the Bluetooth connection state and the data flow, and has the advantages of low power consumption, low time delay, high speed and the like.

Description

A Bluetooth and Wifi switching method and transmission device based on environment perception

technical field

The present invention relates to the technical field of wireless data transmission, in particular to a method and transmission device for switching between Bluetooth and Wifi based on environment perception.

Background technique

Both WiFi and Bluetooth are widely used means of wireless network data transmission. Currently, 70% of mobile phones are equipped with Bluetooth, and 80% of smart phones are equipped with WiFi. In many application scenarios, the two technologies can be used interchangeably, but different wireless data transmission protocols have different characteristics in terms of data transmission rate, power consumption, and transmission distance.

Bluetooth technology includes traditional Bluetooth, high-speed Bluetooth, and low-power Bluetooth technology, providing wireless communication with low power consumption, low latency, and low data transmission rate. Taking BLE (Bluetooth Low Energy, Bluetooth Low Energy) as an example, the transmission distance is 60-100m, and the maximum data transmission rate in the 2.4G frequency band is 250kbps. To complete a connection, that is, to scan other devices, establish a link, send data, authenticate and properly end, it only takes 3ms in total. In terms of power consumption, the terminal node works with a single coin cell battery (such as 3V, 220mAh CR2032) for several months or even years.

WiFi is geared towards high-speed data transfer. The most widely used IEEE 802.11 series 802.11n theoretical rate can reach up to 600Mbps (the industry mainstream is 300Mbps), and the coverage can be expanded to several square kilometers. IEEE 802.11ac can theoretically provide data transmission capacity of up to 1Gbit per second. The power consumption of WiFi is much higher than that of Bluetooth, and energy-saving management modules are usually used to achieve higher energy efficiency. WiFi with PSM (Power Save Mode) mode saves energy by sleeping during idle periods. The radio periodically detects whether the access point has a data packet buffer. When the buffered data volume triggers the PSM threshold, it will switch from the dormant state to the active state. The power consumption of the active state is about 20 times that of the dormant state. By buffering data packets in the AP, on the one hand, energy consumption is saved, on the other hand, an additional 100-300ms delay is added. In this mode, there are two extremes, lower power consumption means higher extra delay; lower extra delay means higher power consumption.

On the one hand, wireless communication is one of the main sources of energy consumption in mobile terminals. Compared with WiFi, Bluetooth has higher power consumption efficiency than WiFi, but provides a narrower bandwidth and has a significant transmission delay for large file transmission. . On the other hand, WiFi can provide higher data transmission rates, but it consumes a lot of energy, and it is difficult to balance power consumption and delay. It is worth noting that the heterogeneity of network data has a certain pattern, and different network service types have different bandwidth requirements. For example, for a typical online video viewing service, the bandwidth is burst-like, and the bandwidth requirement is as high as 3Mb/s, which is suitable for taking advantage of the high-speed advantages of WiFi; while for online voice calls, the bandwidth is relatively fixed, less than 100Kb/s, which is low. Bandwidth requirements are more energy efficient using Bluetooth. Typical smartphone services such as web browsing or social chat have bandwidth requirements below 1Mb/s, and Bluetooth is more suitable. Therefore, it is necessary to explore a low-power, low-latency communication strategy for the heterogeneity of network data.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: in view of the technical problems existing in the prior art, the present invention provides a device that can automatically select Bluetooth or Wifi for data transmission according to the Bluetooth connection state and data flow, and has low power consumption and low delay. , high speed and other advantages, the Bluetooth and Wifi switching method and transmission device based on environment perception can be seamlessly switched between Wifi and Bluetooth.

In order to solve the above technical problems, the technical solution proposed by the present invention is: a method for switching between Bluetooth and Wifi based on environment perception, including:

S1. Obtain the environmental parameters of the Bluetooth device, and determine whether the Bluetooth device meets the data transmission requirements, and if so, jump to step S2, otherwise jump to step S4;

S2. Predict the transmission data flow, and calculate the transmission data rate of the transmission data flow, when the transmission data rate is less than the preset switching threshold, jump to step S3, otherwise jump to step S4;

S3. Data transmission through Bluetooth devices;

S4. Switch the transmission device from the Bluetooth device to the Wifi device, and perform data transmission through the Wifi device.

As a further improvement of the present invention, the environmental parameters in step S1 include network delay, packet loss rate and received signal strength of the Bluetooth network; when the network delay is less than a preset delay threshold and the packet loss When the rate is less than the preset packet loss threshold and the received signal strength is greater than the preset signal strength threshold, it is determined that the Bluetooth device meets the data transmission requirement; otherwise, it is determined that the Bluetooth device does not meet the data transmission requirement.

As a further improvement of the present invention, the specific steps for predicting the transmission data flow described in step S2 include:

S2.1. Obtain historical data traffic;

S2.2. According to the historical data flow, predict the transmission data flow through an autoregressive model.

As a further improvement of the present invention, the specific steps of step S3 include: when the transmission data rate is greater than the preset Bluetooth mode selection threshold, data transmission is performed in a high-speed transmission mode through the Bluetooth device, otherwise data transmission is performed in a low-speed mode through the Bluetooth device. transmission.

As a further improvement of the present invention, the switching of the transmission device from the Bluetooth device to the Wifi device in step S4 is implemented at the MAC layer, and the specific implementation steps are: at the MAC layer, the Bluetooth MAC address of the sender in the data packet is replaced with the Wifi specification. source MAC address, replace the receiver's Bluetooth MAC address in the data packet with the destination MAC address of the Wifi specification.

As a further improvement of the present invention, the data transmission performed by the Bluetooth device in the step S3 and the data transmission performed by the Wifi device in the step S4 are both implemented by the same SOCKET.

As a further improvement of the present invention, before the data transmission through the Bluetooth device in step S3, it also includes a cost accounting step S3A: calculating the Bluetooth cost of data transmission through the Bluetooth device, when the Bluetooth cost is greater than the preset switching cost threshold value , and jump to step S4, otherwise, step S3 is performed, and data transmission is performed through the Bluetooth device. .

As a further improvement of the present invention, before the step S1, it further includes a step S0: obtaining and judging the data sending requirement, when there is a data sending requirement, jump to the step S1, otherwise continue to execute the step S0.

A Bluetooth and Wifi switching transmission device based on environment perception, comprising an environment perception module, a switching decision module, a Bluetooth module and a Wifi module;

The environment perception module is used to obtain the environmental parameters of the Bluetooth device, predict the transmission data flow and calculate the transmission data rate, and send the environmental parameters and transmission data rate to the handover decision module;

The handover decision module is used for selecting to transmit data through a Bluetooth device or to transmit data through a Wifi device;

The bluetooth module is used for data transmission according to the decision result of the handover decision module;

The Wifi module is used for data transmission according to the decision result of the handover decision module.

As a further improvement of the present invention, the handover decision module further includes a cost accounting module for calculating the Bluetooth cost of data transmission with the Bluetooth device.

Compared with the prior art, the advantages of the present invention are:

1. The present invention has two data transmission modes: Bluetooth and Wifi, and automatically selects Bluetooth or Wifi for data transmission by automatically sensing the Bluetooth connection status and data flow, and has the characteristics of rapid adaptability to fluctuations in data rate and connection quality. It has the advantages of low power consumption, low latency, and high speed.

2. The switching between Bluetooth and Wifi of the present invention is implemented at the MAC layer, and in the process of switching between Bluetooth and Wifi, there is no need to interrupt the existing socket connection, thereby realizing seamless switching between Bluetooth and Wifi.

3. The present invention uses the l2cap packet to perform network quality detection, and only performs network quality detection when there is data to be sent. The additional energy overhead caused by network quality detection is small and energy consumption is low.

Description of drawings

FIG. 1 is a schematic flowchart of a specific embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a specific embodiment of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

As shown in FIG. 1 , the method for switching between Bluetooth and Wifi based on environment perception in this embodiment includes: S1. Acquire the environmental parameters of the Bluetooth device, and determine whether the Bluetooth device meets the data transmission requirements, and if so, jump to step S2, otherwise, jump to step S2. Go to step S4; S2. Predict the transmission data flow, and calculate the transmission data rate of the transmission data flow, when the transmission data rate is less than the preset switching threshold, jump to step S3, otherwise jump to step S4; S3 . Carry out data transmission through the Bluetooth device; S4. Switch the transmission device from the Bluetooth device to the Wifi device, and carry out data transmission through the Wifi device.

In this embodiment, the environmental parameters in step S1 include network delay, packet loss rate and received signal strength of the Bluetooth network; when the network delay is less than the preset delay threshold and the packet loss rate is less than the preset delay threshold at the same time When the packet loss threshold value and the received signal strength are greater than the preset signal strength threshold value, it is determined that the Bluetooth device meets the data transmission requirement, otherwise it is determined that the Bluetooth device does not meet the data transmission requirement. The network delay and packet loss rate are obtained by sending l2cap ping data packets. In order to save energy, an asynchronous timing thread is set to periodically obtain environmental parameters. The obtaining period can be set to 1 second. After the Bluetooth connection is established, the Bluetooth device sends l2cap ping to the opposite end device connected by Bluetooth, a total of 4 data packets, records the average round-trip time, and obtains the delay and packet loss rate of the Bluetooth connection through l2cap ping. If the ping fails, that is, the connection is unreachable, or the delay exceeds 100ms, it means that the receiving device has exceeded the Bluetooth radio frequency range, or the RSSI (received signal strength) of the Bluetooth device is lower than the RSSIth (signal strength threshold), then it is judged that the Bluetooth device is not satisfied data transfer requirements. Since the l2cap ping data packet is very small, only 44 bytes, the extra overhead introduced by obtaining the network delay and packet loss rate of the Bluetooth network is small, and the energy consumption is low.

In this embodiment, before step S1, it may further include step S0: acquiring and judging the data sending requirement, when there is a data sending requirement, jump to step S1, otherwise continue to execute step S0. That is, after the Bluetooth connection is established, the detection of the Bluetooth environmental parameters is not carried out all the time, but the environmental parameters of the Bluetooth device are only detected when the device has data transmission requirements, that is, only when the data transmission queue of the device is not empty. , step S1 is performed to obtain the environmental parameters of the Bluetooth device. It can greatly reduce the number of times that the device obtains environmental parameters, thereby greatly reducing the energy consumption of the device and making it more energy efficient.

In this embodiment, the specific steps for predicting the transmission data flow in step S2 are: S2.1. Obtaining historical data flow; S2.2. Predicting transmission data flow through an autoregressive model according to the historical data flow. The autoregressive model is shown in formula (1),

为预测的传输数据流量，S_k-i为历史数据流量，u为自回归模型所采用的历史数据流量样本个数，a_i为自回归模型的系数。在本实施例中，采用1阶自回归模型；自回归模型的系数a_i由历史数据流量通过最小二乘法计算确定，如式(2)所示，In formula (1),

is the predicted transmission data flow, S _ki is the historical data flow, u is the number of historical data flow samples adopted by the autoregressive model, and a _i is the coefficient of the autoregressive model. In this embodiment, a first-order autoregressive model is used; the coefficient a _i of the autoregressive model is determined by the historical data flow through the least squares method, as shown in formula (2),

In formula (2), a _i is the coefficient of the autoregressive model, S _j is the historical data flow, and v is the preset prediction scale parameter. In this embodiment, the preset prediction scale parameter v takes a value of 12. Of course, other values can also be selected according to actual needs.

In this embodiment, both obtaining the environmental parameters of the Bluetooth device and predicting the transmission data flow are performed in the user space.

In this embodiment, when the Bluetooth device meets the data transmission requirement, and the transmission data rate of the transmitted quantity traffic is less than the preset switching threshold, the Bluetooth device is used for data transmission. The specific steps of step S3 include: when the transmission data rate is greater than the preset Bluetooth mode selection threshold, data transmission is performed by the Bluetooth device in a high-speed transmission mode, otherwise, data transmission is performed by the Bluetooth device in a low-speed mode. Compared with Wifi transmission, Bluetooth transmission has the characteristics of shorter transmission distance, lower transmission speed, low delay and low energy consumption. Therefore, for short-distance and small-traffic data, Bluetooth transmission has more advantages than Wifi transmission. In this embodiment, the switching threshold is set to 250Kb/s. When the transmission data rate of the data traffic to be transmitted is less than 250Kb/s, the Bluetooth device is used for data transmission, that is, the delay of data transmission can be guaranteed to meet the transmission requirements. It can also ensure the lowest energy consumption during the transmission process. Otherwise, Wifi is used for data transmission to minimize the delay of data transmission. When data transmission is performed through a Bluetooth device, it is further judged according to the transmission data rate, and the Bluetooth high-speed or low-speed mode is selected for data transmission, so as to ensure that the power consumption of the Bluetooth device can be lower and more energy-saving while meeting the data transmission requirements.

In this embodiment, step S4 is implemented at the MAC layer by switching the transmission device from the Bluetooth device to the Wifi device. The specific implementation steps are: at the MAC layer, replace the Bluetooth MAC address of the sender in the data packet with the source MAC of the Wifi specification. Address, replace the receiver's Bluetooth MAC address in the data packet with the destination MAC address of the Wifi specification. In the data transmission process, the data is finally transmitted in the form of data packets. In this embodiment, by replacing the address information transmitted by Bluetooth in the data packet with the address information transmitted by Wifi at the MAC layer, the data can be transmitted. The packet is switched from being transmitted by the Bluetooth device to being transmitted by the Wifi device.

In this embodiment, the data transmission performed by the Bluetooth device in step S3 and the data transmission performed by the Wifi device in step S4 are both implemented by the same SOCKET. In this embodiment, by opening an l2cap socket at the MAC layer, whether it is Bluetooth or Wifi, data transmission is performed through the l2cap socket. When switching from Bluetooth to Wifi is required, only the Bluetooth MAC in the data packet to be transmitted needs to be changed. The address is replaced with the source MAC address and destination MAC address of the Wifi specification, and data transmission can be performed on the l2cap socket through Wifi. Since the switching process between Bluetooth and Wifi is implemented at the MAC layer and the same l2cap socket is used, there is no need to interrupt the existing l2capsocket connection during the switching process, which can achieve fast and uninterrupted between Bluetooth transmission and Wifi transmission. seamless switching, which is transparent at the user level.

In this embodiment, two devices connected via Bluetooth or Wifi use the same medium for data transmission. When the device chooses to use Bluetooth for transmission, the opposite device also uses Bluetooth for data transmission. When the device chooses to use Wifi for transmission, the The end device also chooses to use Wifi transmission.

In this embodiment, before the data transmission through the Bluetooth device in step S3, a cost accounting step S3A is further included: calculating the Bluetooth cost of data transmission through the Bluetooth device, when the Bluetooth cost is greater than the preset switching cost threshold, Go to step S4, otherwise go to step S3, and perform data transmission through the Bluetooth device.

In this embodiment, the Bluetooth cost includes the Bluetooth time cost and the Bluetooth power consumption cost. The Bluetooth time cost is calculated by the formula shown in formula (3),

In formula (3), t _{ble_send} is the Bluetooth time cost, N is the predicted transmission data flow, and T _max is the maximum transmission rate of the Bluetooth.

The Bluetooth power consumption cost is calculated by the formula shown in Equation (4),

E _{ble_send} =P _ble t _{ble_send} (4)

In formula (4), E _{ble_send} is the cost of Bluetooth power consumption, P _ble is the power of Bluetooth, and t _{ble_send} is the time value calculated by formula (3).

In this embodiment, the preset switching cost threshold includes a switching time cost threshold and a switching power consumption cost threshold. In this embodiment, there are two setting methods for the switching time cost threshold and the switching power consumption cost threshold. The first setting method is: the switching time cost threshold is the switching time cost, and the switching time cost is the time it takes to switch from Bluetooth to Wifi itself; the switching power consumption cost threshold is the switching power consumption cost, and the switching power consumption cost is switching from Bluetooth to The energy consumed by Wifi itself. The second setting method is: the switching time cost threshold is the sum of the switching time cost and the WiFi time cost, and the WiFi time cost is the time it takes to transmit data traffic predicted by WiFi transmission; the switching power consumption cost threshold is the switching power The sum of the power consumption cost and the Wi-Fi power consumption cost, and the Wi-Fi power consumption cost is the energy required to transmit the data traffic predicted by the Wi-Fi transmission. Compared with the first setting method, in the second setting method, the switching time cost threshold and the switching power consumption cost threshold are dynamic values, which are more accurate and ensure that the method with the least cost is always selected for data transmission.

In this embodiment, the priority of the time cost and the power consumption cost can be set as required, which can be divided into three cases: one is that the time cost has priority over the power consumption cost, that is, only the Bluetooth time cost needs to be greater than the switching time cost. When the threshold is reached, jump to step S4 and switch to Wifi transmission; the second is that the power consumption cost has priority over time cost, that is, only when the Bluetooth power consumption cost is greater than the switching power consumption cost threshold, jump to step S4 and switch to Wifi transmission The third is that the time cost and the power consumption cost have the same priority, that is, when the Bluetooth time cost is greater than the switching time cost threshold, and the Bluetooth power consumption cost is greater than the switching power consumption cost threshold, jump to step S4 and switch to Wifi transmission.

As shown in FIG. 2 , the Bluetooth and Wifi switching transmission device based on environmental perception in this embodiment includes an environmental perception module, a switching decision module, a Bluetooth module and a Wifi module; the environmental perception module is used to obtain environmental parameters of the Bluetooth device, predict transmission The data flow and the transmission data rate are calculated, and the environmental parameters and transmission data rate are sent to the handover decision module; the handover decision module is used to select to transmit data through the Bluetooth device or to transmit data through the Wifi device; The decision result is used for data transmission; the Wifi module is used for data transmission according to the decision result of the switching decision module. The handover decision module also includes a cost accounting module for calculating the Bluetooth cost of data transmission with the Bluetooth device. In this embodiment, when the preset switching cost threshold adopts the second setting method in the present invention, the cost accounting module is further configured to calculate the switching cost threshold.

In this embodiment, the environment perception module works in the user space, and is used to perform the steps of obtaining the environment parameters of the Bluetooth device, predicting the transmission data flow, and calculating the transmission data rate of the transmission data flow in the method of the present invention. The switching decision module works at the kernel layer, and is used to decide whether to switch between Bluetooth transmission and Wifi transmission according to the environmental parameters and transmission data rate of the environment perception module, as well as the Bluetooth cost and cost threshold calculated by the cost accounting module. Since the environment perception module and the handover decision module work at different layers, in this embodiment, the data interaction between the environment perception module and the handover decision module is implemented through a netlink socket. The handover decision module can determine whether the Bluetooth device meets the data transmission requirements according to the environmental parameters sensed by the environment perception module. It is also possible to combine the environmental parameters sensed by the environment perception module and the accounting results of the cost accounting module for selection. When selecting a Bluetooth device for data transmission through environmental parameters, the accounting results of the cost accounting module are further considered. When the Bluetooth cost is less than the preset switching When the cost threshold is set, select a Bluetooth device for data transmission, otherwise, use a Wifi device for data transmission. When the switching decision module decides to switch the Bluetooth transmission to the Wifi transmission, it will read the source MAC address and destination MAC address of the WiFi specification in the TCP/IP stack in the device, and replace the Bluetooth MAC address in the transmission data packet with this address.

In this embodiment, by sensing the connection status and data flow, it is possible to automatically switch between Bluetooth and Wifi, and select an appropriate device for data transmission. The size automatically selects the Bluetooth high-speed mode or the Bluetooth low-speed mode for data transmission. Through this adaptive method, it can not only meet the requirements of different transmission rates for devices, but also take into account the requirements for power consumption. The advantages of delay, low power consumption, and high speed.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention should fall within the protection scope of the technical solutions of the present invention.

Claims (8)

1. A Bluetooth and Wifi switching method based on environment perception is characterized by comprising the following steps:

s1, acquiring environmental parameters of the Bluetooth equipment, judging whether the Bluetooth equipment meets the data transmission requirement, if so, jumping to the step S2, otherwise, jumping to the step S4;

s2, predicting the transmission data flow, calculating the transmission data rate of the transmission data flow, and jumping to the step S3 when the transmission data rate is smaller than a preset switching threshold value, or jumping to the step S4;

s3, data transmission is carried out through Bluetooth equipment;

s4, switching the transmission equipment from the Bluetooth equipment to Wifi equipment, and transmitting data through the Wifi equipment;

step S4, switching the transmission device from the bluetooth device to the Wifi device is implemented on the MAC layer, which includes the specific implementation steps: in the MAC layer, replacing the Bluetooth MAC address of the sender in the data packet with a source MAC address of a Wifi specification, and replacing the Bluetooth MAC address of the receiver in the data packet with a destination MAC address of the Wifi specification;

the data transmission through the bluetooth device in the step S3 and the data transmission through the Wifi device in the step S4 are both implemented through the same SOCKET.

2. The bluetooth and Wifi switching method based on environmental awareness as claimed in claim 1, wherein: in step S1, the environment parameters include network delay, packet loss rate, and received signal strength of the bluetooth network; and when the network delay is smaller than a preset delay threshold value, the packet loss rate is smaller than a preset packet loss threshold value and the received signal strength is larger than a preset signal strength threshold value, judging that the Bluetooth equipment meets the data transmission requirement, otherwise, judging that the Bluetooth equipment does not meet the data transmission requirement.

3. The bluetooth and Wifi switching method based on environmental awareness as claimed in claim 2, wherein: the specific step of predicting the transmission data traffic in step S2 includes:

s2.1, acquiring historical data flow;

and S2.2, predicting the transmission data flow through an autoregressive model according to the historical data flow.

4. The bluetooth and Wifi switching method based on environmental awareness as claimed in claim 3, wherein: the specific steps of step S3 include: and when the transmission data rate is greater than a preset Bluetooth mode selection threshold value, carrying out data transmission in a high-speed transmission mode through the Bluetooth equipment, otherwise, carrying out data transmission in a low-speed mode through the Bluetooth equipment.

5. The context awareness-based Bluetooth and Wifi switching method according to any one of claims 1-4, wherein: before data transmission by the bluetooth device in step S3, a cost accounting step S3A is further included: calculating the Bluetooth cost of data transmission by the Bluetooth device, and jumping to step S4 when the Bluetooth cost is greater than a preset switching cost threshold, otherwise executing step S3 and transmitting data by the Bluetooth device.

6. The bluetooth and Wifi switching method based on environmental awareness as claimed in claim 5, wherein: before the step S1, a step S0 is further included: and acquiring and judging the data transmission requirement, and jumping to the step S1 when the data transmission requirement exists, otherwise, continuing to execute the step S0.

7. The utility model provides a bluetooth switches transmission equipment with Wifi based on environmental awareness which characterized in that: the system comprises an environment perception module, a switching decision module, a Bluetooth module and a Wifi module;

the environment sensing module is used for acquiring environment parameters of the Bluetooth equipment, predicting transmission data flow, calculating a transmission data rate and sending the environment parameters and the transmission data rate to the switching decision module;

the switching decision module is used for selecting data transmission through Bluetooth equipment or data transmission through Wifi equipment;

the Bluetooth module is used for carrying out data transmission according to the decision result of the switching decision module;

the Wifi module is used for carrying out data transmission according to the decision result of the switching decision module;

the Bluetooth module and the Wifi module have a common MAC layer, when the Bluetooth device is switched to the Wifi device to transmit data, the Bluetooth MAC address of a sender in the data packet is replaced by a source MAC address of a Wifi specification, and the Bluetooth MAC address of a receiver in the data packet is replaced by a destination MAC address of the Wifi specification;

the Bluetooth module and the Wifi module transmit data through the same SOCKET.

8. The context awareness-based bluetooth and Wifi handover transmission device of claim 7, wherein: the switching decision module also comprises a cost accounting module which is used for calculating the Bluetooth cost of data transmission by the Bluetooth equipment.

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