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Mesh net based OFDMA (orthogonal frequency division multiple access) system and control method

A control method and control node technology, applied in the field of communication, can solve problems such as low spectrum utilization rate and unreasonable resource allocation, and achieve the effect of improving resource sharing and spectrum utilization rate

Active Publication Date: 2014-08-06
KZ BROADBAND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a Mesh network-based OFDMA system and control method, aiming to solve the problems of low frequency spectrum utilization and unreasonable resource allocation in the prior art

Method used

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  • Mesh net based OFDMA (orthogonal frequency division multiple access) system and control method
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  • Mesh net based OFDMA (orthogonal frequency division multiple access) system and control method

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Embodiment 1

[0033] In indoor application scenarios, such as figure 1 As shown, all Mesh networks 102 cannot obtain GPS synchronization signals. At this time, any node in the network can be selected as the control node, for example, node E is selected as the control node. The control node is a node temporarily assigned in the network, and can be dynamically changed according to the real-time topology of the Mesh network. The control node E is connected with the same synchronization signal as nodes A, B, C, D and F, so that the signals of other nodes are synchronized with the signals of the control node E. The control node E is responsible for controlling, coordinating, and allocating the sending and scheduling of data blocks corresponding to each node through the communication protocol. In the same time domain, the data broadcasted by each node (including the control node) in the Mesh network 102 is consistent. When receiving, the equipment corresponding to each node receives its own data...

Embodiment 2

[0035] In outdoor application scenarios, such as figure 2 As shown, each node of each unit in the MESH network 102 is equipped with a GPS antenna 1022, and the GPS antenna 1022 is respectively set on each node, and each node can obtain a GPS clock synchronization signal 1022 through the GPS antenna 1022. When all the nodes in the Mesh network can normally receive the GPS clock synchronization signal, the synchronization frame header is correspondingly the GPS synchronization frame header. like figure 2 , Node A, Node B, Node C, Node D, Node E, and Node F are all provided with a GPS antenna 1022 . At this time, any node in the network can be selected as the control node, for example, node E is selected as the control node. The control node is temporarily assigned in the network and can change its role at any time. The control node E with the GPS antenna is mainly responsible for controlling, coordinating and distributing the sending and scheduling of data blocks correspondi...

Embodiment 3

[0037] In indoor and outdoor or mixed application scenarios, such as image 3 As shown, when synchronous communication is required between different Mesh networks, the frame structures sent by the two unsynchronized network nodes are different. At this time, the control node needs to be selected as the relay control node. Preferably, the node closest to the physical location between the two Mesh networks is selected as the relay control node, and the relay control node preferably selects the node that can normally receive the outdoor GPS clock synchronization signal. For example, node E is selected as the relay control node. The relay control node is used for synchronizing the frame structure between two Mesh networks with asynchronous communication, and re-dividing the two Mesh networks in the same time domain and frequency domain. The two Mesh networks with asynchronous communication are two originally independent edge nodes that meet the geographic location conditions for ...

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Abstract

The invention is applied to the technical field of communications and provides a Mesh net based OFDMA (orthogonal frequency division multiple access) system. The Mesh net based OFDMA system comprises a Mesh net and multiple data blocks divided according to time domain and frequency domain and orthogonal but non-overlapping, the Mesh net includes multiple nodes, and each node is connected with other one or multiple nodes. The data blocks are provided with retention gaps in front of the time domain. The nodes include one control node, and synchronizing signals corresponding to the nodes are accessed in the control node, so that signals of the nodes are synchronous to the signals of control node, and the control node controls and coordinates sending and scheduling of the data blocks of the nodes through a communication protocol. The control node is further used for controlling and managing data blocks commonly needed in the Mesh net and the arrangement pattern of the data blocks in the same time domain and frequency domain. The OFDMA system is applied to Mesh Internet networks with indoors or outdoors distribution or indoor and outdoor mixed distribution of the communication nodes through combination of the Mesh net and the OFDMA technology, and frequency spectrum utilization and resource distribution and flexibility of wireless networks are improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a Mesh network-based OFDMA system and a control method. Background technique [0002] FDMA (Frequency Division Multiple Access / Address), also known as Frequency Division Multiple Access, is a technology in data communication that can be used to achieve channel sharing. Different users are assigned to channels with the same time slot but different frequencies. According to this technique, the frequency bands centrally controlled in the frequency division multiple access transmission system are allocated to users according to requirements. Compared with fixed distribution systems, frequency division multiple access enables channel capacity to be dynamically exchanged according to requirements. Frequency division multiple access adopts frequency modulation multiple access technology, and business channels are allocated to different users in different frequency ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04L27/26H04W4/02
CPCH04W56/00H04L5/0007H04L5/0032H04W72/12H04L27/2602H04W84/20H04W4/025H04W40/22H04W56/0015H04W72/0446H04W72/0453H04W84/18
Inventor 周宗仪廖晓如程金鹏
Owner KZ BROADBAND TECH
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