Self-adaptive method for sending packet in selected delay

A transmission method and self-adaptive technology, applied in the direction of digital transmission system, electrical components, error prevention, etc., can solve the problems of system interference, Bluetooth system system interference, etc., to achieve the effect of eliminating interference, saving power, and realizing easy

Inactive Publication Date: 2005-11-16
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the method for interference between the Bluetooth system and the 802.11b system, the present invention provides a

Method used

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  • Self-adaptive method for sending packet in selected delay
  • Self-adaptive method for sending packet in selected delay

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Embodiment 1: First, the channel is evaluated according to the packet loss rate of the Bluetooth sending unit. The packet loss rate of the sending unit is calculated at the receiving unit and is related to the frequency hopping point. When the packet loss rate is greater than the threshold, the channel is regarded as a bad channel, otherwise, it is regarded as a good channel, and the channel state table can be obtained from this.

[0025] The data transmission of Bluetooth is controlled by the master unit, therefore, the slave unit must notify the master unit of the latest channel state table of the master unit. To this end, a new link management protocol PDU is defined to carry the channel state of the main unit. At regular intervals, the slave unit calculates the packet loss rate, refreshes the channel state table, and sends it to the master unit through the above PDU.

[0026] The Bluetooth physical channel is a time division duplex frequency hopping channel, and the cha...

Example Embodiment

[0033] Embodiment 2: The present invention is mainly used in the media access control layer (ie, MAC layer) of the Bluetooth module, and it can be used as a MAC layer access mechanism. Reference attached figure 1 .

[0034] The first part is the channel evaluation part. The Bluetooth unit has 79 channels. At each channel frequency, the packet loss rate of the Bluetooth master and slave unit at this frequency is measured. The packet loss rate here is defined at this frequency for a period of time. The number of lost packets is divided by the sum of the number of lost packets at this frequency and the number of successfully received packets at this frequency. At this time, set a threshold for the packet loss rate. When the packet loss rate is greater than this threshold, it is considered that the channel interference is serious, and the channel is unavailable. The channel status of the master unit is measured in the slave unit according to the packet loss rate of the received packe...

Example Embodiment

[0040] Embodiment 3: An adaptive packet selection delay transmission method further includes the step of channel evaluation:

[0041] Step 1: Set a threshold for the packet loss rate.

[0042] Step 2: Measure the channel status of the slave unit in the master unit, and measure the channel status of the master unit in the slave unit.

[0043] Step 3: Measure the packet loss rate of the Bluetooth master and slave unit at this channel frequency at each channel frequency point.

[0044] The packet loss rate of the defined channel frequency point is the number of packets lost at this frequency point in a period of time divided by the sum of the number of packets lost at this frequency point and the number of packets successfully received at this frequency point.

[0045] Step 4: When the packet loss rate is greater than the threshold, the channel interference is considered serious, and the channel status is marked as unavailable;

[0046] When the packet loss rate is less than the thre...

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Abstract

The method solves issue of interference between blue teeth system and 802.11b system. In beginning period of time of running, blue teeth unit evaluates channel so as to obtain condition of channel quality. Then, based on different conditions of channel quality, the blue teeth unit selects transmitting time from single time slot, three time slots or five time slots. Different transmitting time causes change of transmitted carrier frequency so as to avoid same frequency interference. Further, interference between blue teeth system and 802.11b system is eliminated. This method makes rate of packet loss between blue teeth system and 802.11b system decrease to close to zero. The method is simple and easy implementation, and is applicable to design of new blue teeth system or upgrading existing blue teeth system.

Description

Technical field [0001] The invention relates to an adaptive packet selection delay sending method. belongs to the field of communication. Background technique [0002] As a radio frequency technology that replaces wired connections, Bluetooth has the characteristics of low cost, medium speed, and short-range effects. It can support a micro-network with up to 8 active users, support up to 3 simultaneous links for real-time communication, and can also support non-connected Asynchronous links exchange non-real-time data. The Bluetooth physical layer adopts frequency hopping spread spectrum, and the modulation method is Gaussian frequency shift keying. According to the bluetooth application situation, most bluetooth systems transmit power to 1mW, and the transmission rate is 2Mb / s. [0003] 802.11 devices, like Ethernet networks, can support multipoint communications, such as broadcast, multicast, and point-to-point data communications. Each device has a unique MAC address, ...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 朱刚吴彦奇
Owner BEIJING JIAOTONG UNIV
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