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Broadband cluster wireless transmission method and system

A technology of wireless transmission and broadband trunking, which is applied in the field of broadband trunking wireless transmission and broadband trunking wireless transmission system, can solve the problems of unsuitability for trunking systems and increase the difficulty of equipment implementation, and achieve the effect of less difficulty in implementation and simplified process.

Active Publication Date: 2017-04-26
湖南农民伯伯集团有限公司
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Problems solved by technology

[0005] The shortcomings of the LTE protocol are: for the public network business operation environment, it is suitable for application scenarios with large bandwidth and a large number of simultaneously activated services, and is not suitable for half-duplex applications such as trunking systems that need to support special business models such as group calls and all calls. Scenes
The dynamic resource scheduling method it adopts; different multiple access methods for uplink and downlink (OFDM for downlink and DFT-S-OFDM for uplink); wireless frame length of 5ms or 10ms, shorter interval between uplink and downlink switching points, the above three points will make the implementation of related equipment more difficult

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  • Broadband cluster wireless transmission method and system

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Embodiment Construction

[0064] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0065] In order to solve the deficiencies in the prior art, the present invention provides an advanced wireless frame structure, and realizes broadband trunking wireless transmission based on the wireless frame.

[0066] Such as figure 1 As shown, the time slot length of the radio frame is divided in units of OFDM symbols.

[0067] The length of the wireless frame is 20ms, a total of 64000 sampling points, including 6 time slots: data time slot slot0, data time slot slot1, data time slot slot2, data time slot slot0, downlink synchronization time slot (dl sync slot), and GP guard slot.

[0068] The length of one OFDM symbol (symbol) is 256+64=320 sampling points, and the duration is 100us. In order to support wide-coverage cell configuration and resist intersymbol interference (ISI) caused by multipath effects, the CP length of the cyclic pr...

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Abstract

The invention relates to a broadband cluster wireless transmission method. A TDD duplex mode, an OFDM multiple access mode and a semi-static resource scheduling method are used, and a system can bear various types of service such as voice calls and video surveillance. According to the broadband cluster wireless transmission system of the invention, the broadband cluster wireless transmission method of semi-static resource allocation is used, the TDD duplex mode and the OFDM multiple access mode are used, and thus the cluster system can bear traditional voice service and also can bear high-speed data service such as video. Compared with the prior art, the method has the advantages of wide bandwidth, simple process and little difficulty in realization and is more suitable for the service of the cluster system.

Description

technical field [0001] The present invention relates to communication technology based on voice and low-speed data transmission, more specifically, to a broadband cluster wireless transmission method and a broadband cluster wireless transmission system. Background technique [0002] Traditional narrowband trunking is a communication system based on voice and low-speed data transmission, which occupies most of the current trunking system market and plays an important role in command and dispatch. With the rapid development of wireless high-speed data service requirements, broadband has become an inevitable trend in the development of wireless communication networks. In the process of using the trunking communication system for command and dispatch, industrial users not only need to "hear" and "call", but also "see" and "see clearly". They need to support the return of video images, but Due to the bandwidth limitation of the traditional narrowband trunking system, it is natur...

Claims

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Application Information

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IPC IPC(8): H04W72/12H04W74/08H04W76/02H04L5/00H04L5/14
CPCH04L5/0007H04L5/003H04L5/1469H04W72/12H04W74/0833H04W74/0858H04W76/10
Inventor 戴国良
Owner 湖南农民伯伯集团有限公司