Showing papers on "Wireless ad hoc network published in 1995"

Ad hoc initialization for wireless local area network

Abstract: A wireless network is initialized by communications between mobile units forming an ad hoc network or by communications between a mobile unit and an access point unit. Mobile units transmit announcements in order to establish a communication link. To ensure the announcements are received, the mobile units scan different frequencies at various times using various hop sequences. Once communication is established, one mobile unit adopts the hop frequency of the other mobile unit according to a comparison between the hop frequencies of the two units. Multiple mobile units initialize to form ad hoc networks in similar manner.

Performance of CSMA-CA MAC protocol for distributed radio local area networks

Abstract: Carrier sense multiple access with collision avoidance (CSMA-CA) will be used as the basic medium access control (MAC) protocol for wireless LANs. Wireless LAN will be supporting two types of services, time bounded and asynchronous data transmission. In this paper we present simulation results for throughput and delays for a distributed radio LAN for different values of inter frame spacing periods, transmission speeds and number of nodes. Depending on the application, the results obtained suggest that proper inter frame space values have to be chosen for optimal network performance.

Ad Hoc packet data networks using cellular telephone networks

Abstract: This invention discloses a method and apparatus for acquiring and maintaining a cellular wireless communications subnetwork on an Ad Hoc basis, where mobile units within a cellular network communicate with each other using only a single communications channel of the entire cellular wireless communications network.

Ad-hoc wireless networking: contention free multiple access using token passing

Abstract: Discusses mobile broadband communications with project groups such as ETSI RES 10 and ESPRIT LAURA providing much of the input. The immediate application of such systems would hope to provide high speed data links for users within a small location area and as such would have to be capable of overcoming the significant problems that the radio channel imposes. The authors discuss LANs and MAC protocols.

A capacity effect of bridging functionality applied to wireless packet datalink

Abstract: This paper calculates the capacity efficiency of various data link methods in wireless LAN communications. For LAN communications, the packet reachability between mobile stations within the same cell should be guaranteed, as intracell communication is important. In order to realize this, we have proposed a bridging functionality which automatically transfers the packet at an access point when the source cannot send the packet to destination directly. The theoretical capacity efficiency is calculated and compared against other methods, non-bridging (i.e., direct communications) and full-time bridging (i.e., the access point always bridges data). The evaluation results show that the proposed method is always efficient.