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Method for switching-on and synchronization of mobile terminal of radio local network system

A wireless local area network and mobile terminal technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problems of affecting spectral efficiency, waste of resources, and insufficient flexibility, and achieve increased system resources, reduced occupation ratio, and improved frequency spectrum. The effect of efficiency

Inactive Publication Date: 2003-10-29
BEIJING HUAWEI DIGITAL TECH
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Problems solved by technology

[0005] The frame format of 802.11a and HiperLAN2 are different, but only TDMA is used to distinguish different mobile terminals.
[0006] Therefore, the disadvantage of the wireless local area network in the prior art is that the forward common channel and the traffic channel adopt a time-division method, especially the common control channels between different sectors cannot be sent at the same time, which causes a certain waste of resources. Spectrum efficiency is affected to a certain extent; only TDMA is used to distinguish different mobile terminals, so the resource scheduling method is not flexible enough, especially when the cell load is heavy (such as a large number of low-speed mobile terminals or a large total data rate) , the computational complexity of resource scheduling is relatively large; the number of OFDM subcarriers cannot be changed flexibly. When channel conditions change and it is desired to change the transmission rate accordingly, it can only be realized by changing the modulation method and channel coding method; when networking, adjacent cells It can only be distinguished by different carrier frequencies, which occupy more frequency resources when networking

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  • Method for switching-on and synchronization of mobile terminal of radio local network system
  • Method for switching-on and synchronization of mobile terminal of radio local network system
  • Method for switching-on and synchronization of mobile terminal of radio local network system

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. This embodiment illustrates how to implement the wireless local area network of the present invention through four parts: the physical frame structure of the present invention, the adjustment and modification of each channel of the wireless local area network in the prior art, the mobile terminal access process, and delay control.

[0024] 1. The physical frame structure of the present invention

[0025] The schematic diagram of the physical frame channel structure of the LAS-WLAN of the present invention is as follows figure 2 shown.

[0026] Let the physical frame length be 2ms, and the chip rate be 20Mbps.

[0027] If a cell has multiple sectors, then with figure 1 different( figure 1It is a MAC frame structure, and each channel of the corresponding physical layer frame structure is also time-division. Here, for the convenience of introducing the ...

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Abstract

An access and synchronizing method of mobile terminal in wireless LAN is characterized by that a direct sequence spread spectrum (DSSS) technique is used, in which a large area synchronizing (LAS) code as high-efficiency spread spectrum code can be used as sector ID, synchronizing code, access code, or spread spectrum code, and includes LA codes and LS codes. Said LAS code has features of zero interference window and low multi-address and multi-path interferences. Its access method is characterized by that the dynamic CDMA and TDMA are combined for simplifying the scheduling calculation of AP.

Description

technical field [0001] The invention relates to a construction method of a wireless local area network system in mobile communication, in particular to a mobile terminal access and synchronization method of the wireless local area network system. Background technique [0002] Wireless LAN standards are mainly divided into two major protocol systems: the IEEE 802.11 protocol standard system and the HiperLAN protocol system formulated by the European Telecommunications Standards Institute (ETSI). Among them, the 802.11 system mainly includes 802.11a and 802.11b, both of which are connectionless-oriented standards, and specify WLAN physical layer (PHY, Physical Layer) and medium access control (MAC, Medium Access Control) specifications. Currently the most widely used WLAN is IEEE 802.11b, which works in the 2.4GHz frequency band and supports a maximum rate of 11Mbps. 802.11a works in the 5GHz frequency band, and the physical layer rate can ...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04L9/00
Inventor 吴更石蒋朱成杨芳梁
Owner BEIJING HUAWEI DIGITAL TECH
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