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A data forwarding method on a Wi-Fi Direct-based D2D link

A forwarding method and data technology, applied in wireless communications, transmission systems, wireless network protocols, etc., can solve problems such as low feasibility, Wi-FiAd-Hoc mode does not support long-distance communication, and application-level inaccessibility, etc., to achieve savings time, the effect of reducing the link load

Active Publication Date: 2021-06-04
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are researches on the implementation of hotspots on P2P links based on Wi-Fi Ad-Hoc mode. However, in Android mobile devices, Wi-Fi Ad-Hoc mode is implemented at the kernel level and cannot be accessed at the application level. Compile the entire system for each target device, less feasible
In addition, Wi-Fi Ad-Hoc mode does not support long-distance communication, which is limited in the case of no local access to the Internet infrastructure

Method used

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  • A data forwarding method on a Wi-Fi Direct-based D2D link
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  • A data forwarding method on a Wi-Fi Direct-based D2D link

Examples

Experimental program
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Embodiment 1

[0021] Embodiment one: see Figure 1 ~ Figure 4 , the data forwarding protocol on the D2D link based on Wi-Fi Direct, the execution of this protocol depends on two parts: the first part manages the service to send requests and responses; the second part manages the connection with the Internet server. The first part of the protocol utilizes the service discovery function in WFD, so that service discovery frames are optionally exchanged between nearby devices, so as to identify the services supported by each nearby device, and the devices match each other through their own attributes to forward user data To nearby devices, the device receiving the data checks the Internet connection and decides whether the data can be connected and forwarded to the cloud, or the information can be repackaged in a service and broadcast again to other potentially nearby devices. The second part uses the existing application layer protocol HTTP to establish a connection, and the server part of the...

Embodiment 2

[0022] Embodiment 2: This embodiment is basically the same as Embodiment 1, and the special features are as follows: The WFD service discovery function uses two protocols: DNS and DNS-SD. Multicast DNS works in a distributed manner, and the protocol needs to be implemented on all participating devices; SD in DNS-SD stands for service discovery, and DNS-SD can add services supported by each device to DNS records. DNS supports two record methods: SRV record and TXT record. SRV records provide a mapping between hosts and the services they support. A reverse DNS lookup of a service name can extract all device IDs that support that service name. After retrieving the device ID, check all the services supported by the device through SRV record lookups; TXT records are used to store additional text information for domain names. Android 4.1 and above support the service discovery function of WFD. Service discovery allows the operation of service discovery query before the group negoti...

Embodiment 3

[0023] Embodiment three: figure 1 A single-hop situation between two P2P devices is shown. Solid line path: In case Device 1 has access to the Internet, choose to connect directly to the Internet infrastructure and reach the server. Dotted path: In the case that device 1 cannot access the Internet, use WFD to send data to nearby device 2, device 2 can access the Internet infrastructure, and data can reach the server through device 2.

[0024] figure 2 Shows the exchange flow of service discovery frames in a WFD group when two nearby devices “D1” and “D2” are considered. Service discovery in WFD is before the start of P2P GO negotiation (in figure 2 An optional feature before step 3 of ), that is, devices can exchange data in the form of service records before selecting a group owner or establishing a connection. So using the service discovery feature allows the protocol to function automatically without human intervention, such a protocol saves time and automatically for...

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Abstract

A data forwarding protocol on a D2D link based on Wi‑Fi Direct (WFD) technology, the protocol is based on WFD and D2D communication technology, and belongs to the field of wireless communication technology. Aiming at disaster areas with deteriorating cellular services and insufficient Wi-Fi coverage, an efficient data forwarding protocol is developed by using the service discovery function in WFD, which can push data to the cloud through multi-hop D2D communication. The protocol solves the technical difficulty of not being able to communicate across groups in the standard WFD mode and the inconvenience of relying on the basic network architecture for traditional communication. The protocol of the present invention allows devices to use other Internet-connected devices as a springboard to send data to the cloud, realizing remote communication without infrastructure, and providing convenience for search and rescue of disaster events.

Description

technical field [0001] The invention relates to a data forwarding protocol on a D2D link based on Wi-Fi Direct (WFD). The protocol is based on WFD and D2D communication technologies, and belongs to the technical field of wireless communication. Background technique [0002] Traditional wireless communication networks have high requirements for communication infrastructure, and damage to core network facilities or access network equipment may lead to the breakdown of the communication system. The introduction of D2D communication technology makes it possible for cellular communication terminals to establish a communication network. When the wireless communication infrastructure is damaged, or in the coverage blind area of ​​the wireless network, the terminal can use D2D to realize end-to-end communication and even access the cellular network, and the application scenarios of wireless communication are further expanded. [0003] WFD is a point-to-point connection technology, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04L29/08
CPCH04L67/02H04L69/03H04W80/00H04L67/51H04L67/55
Inventor 张雪凡黄诗童陈兵周伟张其洋
Owner SHANGHAI UNIV
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