Discovery process time delay optimization method of bluetooth device
An optimization method and technology of Bluetooth devices, applied in electrical components, wireless communication, connection management and other directions, can solve the problem that the master device cannot receive the information of the slave device, and achieve the effect of avoiding the conflict of return packets and improving the application prospect.
Active Publication Date: 2015-07-08
NANJING UNIV OF POSTS & TELECOMM
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In the case of no loopback packet conflict, the overall delay time is: T=2*FS+RB, and the average query scan time is: τ is the time required to scan a frequency band; from the analysis of the query state, since the master device turns to the B sequence after the A sequence scans 256 times, when the slave device and the master device start to scan the frequencies not in the same sequence, at least The delay of 4096 time slots will cause a delay of 8192 time slots in severe cases; when the system includes a master device and n sub-devices, the average random backward delay is The non-collision probability of device loopback packets decreases with the increase of the number of devices. With the increase of the number of devices querying and scanning status, if the random backward delay remains constant, the probability of conflict will gradually increase, and eventually the master device will always be unable to Received slave device information
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[0019] In order to describe in more detail the Bluetooth device discovery process delay optimization method proposed by the present invention, in conjunction with the accompanying drawings, an example is as follows:
[0020] Step 1: Build a network environment, define master and slave devices, set the number of master devices to 1, and the number of slave devices to n. When the device discovery process starts, the master device is in the query state, and the slave device is in the query scan state;
[0021] The second step: if Figure 4 As shown, change the query mode of the master device, and change the original query mode of A and B sequence for 256 times and then turn to another sequence mode to change the query mode of the master device to 256 times at 32 query frequencies in sequence;
[0022] Step 3: The slave device listens to the ID packets from the master device on the same 32 frequencies, and enters the random backward delay stage after listening;
[0023] Step 4: ...
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The invention provides a discovery process time delay optimization method of a bluetooth device. The discovery process time delay optimization method of the bluetooth device comprises a device query time delay optimization method and a self-adaptive random backward time delay optimization method based on a back off algorithm. After device query time delay optimization, average value time of search scanning time is just 0.48 times of former time. When querying scanning child devices are increased, the self-adaptive random backward time delay optimization method based on the back off algorithm increases random backward time delay to avoid conflict of loopback bags. The discovery process time delay optimization method of the bluetooth device can achieve optimization of optimization objectives, is simple and easy to achieve, and has good application prospect.
Description
technical field [0001] The invention belongs to the technical field of mobile communication, and specifically refers to a time delay optimization method for a bluetooth device discovery process. Background technique [0002] The development of wireless technology has significantly improved the types and performance of wireless systems. The integration of different wireless systems forms a wireless ubiquitous network, which can realize communication between any person and thing at any time and any place, making up for the shortcomings of a single network. , to meet the different needs of users. The heterogeneous integration of the network further promotes the interaction of devices in different access networks. However, the increase in the number of user terminals brings operational complexity. The emergence of virtual terminal technology solves this problem in a timely manner. This technology can provide users with a unified interface And diversified services, combining dif...
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IPC IPC(8): H04W76/02
Inventor 张晖赵远林杨龙祥朱洪波
Owner NANJING UNIV OF POSTS & TELECOMM