Communication system and method based on relevant radio local area network

Abstract

The system comprises AP base on IEEE 802.11 a / b / g standard and at least one STA. The STA is interconnected through double frequency AP and switched in with Internet, the AP can work on 2.4 GH2 and 5GH2 frequency range at the same time for providing 802.11a, 802.11b and 802.11g radio service to STA, the local area network correlation system can be switched in with STA of 802.11b, 802.11g and 802.11a and can make terminal with different standard communicate to each other. Also the system can select the most suitable means to carry on communication according to various network conditions.

Description

technical field [0001] The present invention relates to a wireless local area network system and a communication method thereof, in particular to an interrelated wireless communication system and communication method based on the Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers, IEEE) 802.11 series of wireless local area network standards, It belongs to the field of communication technology. Background technique [0002] With the increasing popularity of wireless LAN, IEEE has launched 802.11b and 802.11a technologies, and 802.11g will be launched soon. Among them, the 802.11b transmission rate can reach up to 11Mbps, and the frequency band adopts the 2.4GHz frequency band without application. IEEE 802.11a selects an Orthogonal Frequency Division Modulation (OFDM) modulation method that can effectively reduce multipath attenuation and effectively use frequencies, and selects the 5GHz frequency band with less interference, ...

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Problems solved by technology

[0003] Among the three protocols mentioned above, 802.11b was put into use earlier, and its current market penetration rate is relatively large, but its transmission rate and available frequency band are subject to certain restrictions; since it works in the 5GHz frequency band, the transmission rate and available frequency band of 802.11a are both limited. It is better than 802.11b / g, but because it works in the high-frequency region, its transmission attenuation will be much larger than that of 802.11b / g working in the low-frequency region; because it uses the same OFDM modulation method as 802.11a, 802.11g can also It has a high transmission rate, and because it works in the 2.4GHz frequency band, it is compatible with 802.11b and the transmission loss is lower than that of 5GHz, but also because it works in the same frequency band as 802.11b, the relative protocol overhead of 802.11g will be larger , which affects its transmission rate to a certain extent

[0004] Currently, the upcoming 802.11g specifies protocols to work in harmony with 802.11b, but does not specify how 802.11a will interconnect with 802.11b / g

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