Reservation Information Selection Method Based on Collaborative Reservation in Wireless Ad Hoc Networks
A wireless self-organizing network and reservation information technology, which is applied in wireless communication, network topology, electrical components, etc., can solve the problems of real-time node interference and inability to receive, and achieve the goals of strengthening cooperative forwarding, improving reservation reliability, and improving collaboration efficiency Effect
Inactive Publication Date: 2011-12-14
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
Neighboring nodes located in the transmission range of real-time nodes can correctly receive the packets sent by them with a certain probability, and multi-step reservation improves the reservation reliability of real-time services in this area to a certain extent; Since the packet sent by the real-time node cannot be received (that is, the reservation information in it cannot be obtained), it may transmit its own packet within the reservation period of the real-time node, causing interference to the real-time node. This is the basic reservation mechanism and the multi-step reservation mechanism. unsolvable problem
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[0041] All DPKs and unreserved RPKs access channels in IEEE 802.11 DCF mode (that is, contention mode, using RTS-CTS-DPK-ACK and RTS-CTS-RPK-RACK dialogue). Once an RPK is successfully sent in the contention mode, the subsequent RPK will switch to the reservation mode (using RPK-RACK dialogue) to access the channel; If successful, the subsequent RPK will switch to the reservation mode access again. If the retransmission fails (that is, the RPK cannot be successfully sent within the retransmission threshold), the RPK in the next cycle will still access the channel in the contention mode. After the transmission is successful, the subsequent RPK will switch to Access for appointment mode.
[0042] The channel reservation is initiated by the sender of RPK and RACK: these two packets carry the channel reservation information of the next cycle; by listening to these two packets, the neighboring nodes record the reservation information in their corresponding reservation table. Durin...
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The invention discloses a coordination-reservation-based method for selecting reservation information in a wireless Ad Hoc network. When the reservation information of other real-time services is coordinatively transmitted, coordination opportunities of reservation information distributed to a reservation table are guaranteed to be equal; and the coordination frequency of the reservation information having the most urgent requirement for reservation reliability is increased, so the reservation information can be coordinatively transmitted by using limited coordination opportunities, the coordination efficiency in the limited coordination opportunities is improved and the reservation reliability is improved.
Description
technical field [0001] The invention relates to the technical field of wireless communication, in particular to a real-time service transmission method. Background technique [0002] Wireless self-organizing network (Ad hoc network) is a wireless multi-hop network composed of a group of nodes of the same level. The network does not contain any central control nodes and infrastructure. Each node has its own wireless transceiver device, and the nodes rely on mutual coordination for channeling. access. This kind of network has low cost, strong invulnerability, fast networking speed and wide application fields. [0003] With the continuous development of wireless network technology, the transmission of some services with special quality of service requirements in the Ad hoc network has gradually become a research hotspot, such as multimedia real-time services. higher requirements. In an Ad hoc network, since all nodes access channels in a random competition manner, packet con...
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IPC IPC(8): H04W84/18
Inventor 李波袁韵洁
Owner NORTHWESTERN POLYTECHNICAL UNIV