 Simple multicast extension for mobile IP SMM |
| In a preferred embodiment, the invention is a method and apparatus for routing data to a mobile ... |
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| Task-driven distributed multimedia consumer system |
| To this end, the invention provides a control system comprising multiple electronic devices ... |
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| Method and apparatus for operating the internet protocol over a high-speed serial bus |
| In accordance with a first aspect of the invention, a method of reconfiguring the bus lint without ... |
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| Wireless coupling of incompatible nodes via a virtual network |
| What is claimed is: 1. A wireless information system for wireless communication with at least one ... |
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| Digital radio frequency interference canceller |
| Broadly speaking, the invention pertains to radio frequency (RF) interference cancellation ... |
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| Digital radio frequency interference canceller |
| Broadly speaking, the invention pertains to radio frequency (RF) interference cancellation ... |
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| Low complexity frequency estimator and interference cancellation method and device |
| In a first aspect of the invention, a method and apparatus is provided for identifying the ... |
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| Device for generating a digitally modulated test signal |
| The invention claimed is: 1. A method for generating a digitally modulated test signal comprising: ... |
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| Spectrum spread transmission method and apparatus |
| It is an object of the present invention to provide spectrum spread system transmission method and ... |
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Methods and apparatus for topology sensing in networks with mobile nodes
| Details |
Inventors: Ahmed, Walid; Jiang, Hong; Kodialam, Muralidharan Sampath; Monogioudis, Pantelis; Rege, Kiran M.;
Assignee: Lucent Technologies Inc. (Murray Hill, NJ)
Primary Examiner: Chin; Wellington
Assistant Examiner: Jagannathan; Melanie
Attorney, Agent or Firm:
A novel topology sensing methodology is provided for point-to-point link setup among a set of network nodes, which are mobile. The technique provided is TDMA contention-based, where each network node sends pilot signals to announce its existence. Pilot signals transmitted by network nodes are used by surrounding nodes to extract various pieces of information such as node identity, node location and potential link quality. Information collected from pilot signals of neighboring nodes is used in conjunction with other topological criteria to identify the best set of nodes with which a given node should establish links. The topology sensing methodology avoids duplexer problems and attempts to achieve minimum collision by allowing the nodes to continually monitor available pilots and transmit on the least-interference channels. The topology sensing methodology can also optionally make use of GPS information, when available, in order to provide an accurate map for communicating nodes and improve the link setup process. |
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DETAILED DESCRIPTION The present invention addresses the above mentioned issues by providing methodologies which allow mobile network nodes to sense the presence of one another on a dedicated channel.
Moreover, the present invention allows these nodes to collect additional information about their neighbors such as, for example, potential link quality (e.
g.
, if a point to point link were to be set up with them) which can be highly useful in making link setup decisions whose objective is to achieve good overall network connectivity and power and frequency reuse efficiency.
It is to be appreciated that the phrase "network node" as used herein is intended to refer to a mobile device which allows mobile users (mobile user stations, terminals, etc.
) to access the communications network and also may provide routing functions for traffic traversing the network.
Network nodes are preferably connected by point-to-point wireless links to provide network-wide connectivity.
In other words, a network node is an access node that acts like a base station, however, it is capable of being mobile, as mentioned earlier.
A network node collects traffic from mobile users connected thereto and trunks such traffic to the rest of the network through point-to-point links with neighbor nodes of a similar nature.
A network node also delivers traffic received through the point-to-point links to appropriate recipients among the mobile users connected thereto.
As will be seen in an exemplary embodiment, mobile users may be connected to a mobile network node via some "multiple access" medium such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), or others, while network nodes are preferably connected to each other via point-to-point wireless links.
The present invention is concerned specifically with topology sensing as needed for the point-to-point links among network nodes, or similar scenarios.
In a first aspect of the present invention, methods and apparatus are provided for constructing pilot signals that are transmitted by all mobile network nodes on channels independent of the user traffic channels, i
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Multiplexer-related 
