Motorola

About: Motorola is a company organization based out in Schaumburg, Illinois, United States. It is known for research contribution in the topics: Signal & Communications system. The organization has 27298 authors who have published 38274 publications receiving 968710 citations. The organization is also known as: Motorola, Inc. & Galvin Manufacturing Corporation.

Method and apparatus for providing a communication unit with a handoff between networks

Abstract: A communication unit (10) includes a mobility agent (225) for providing handoffs between a cellular network and a wireless local area network (11). The communication unit (10) determines if it should switch between the wireless local area network (11) and the cellular network for obtaining service, requests a handoff to the wireless local area network (11) or to the cellular network by sending a SIP message addressed to either a public number (229) or a private number (231) associated with the communication unit (10) upon making the determination. The communication unit (10) accepts a new call from an enterprise server (12) over the determined network. Corresponding methods of providing a hand-off is described.

Method and apparatus for transmission and reception within an ofdm communication system

Abstract: A communication system (fig. 4) comprising a first multicarrier transmitter (401/506) outputting a first spread pilot signal (504) over a first spreading block interval on a first plurality of subcarrier (fig. 5). A second multicarrier transmitter (401/506) outputting a second spread pilot signal (504) on the first plurality of subcarriers within the spreading block interval, wherein for each of the plurality of subcarriers, the second spread pilot signal differs form the first pilot signal by a predetermined amount.

Method and apparatus for providing high data rate traffic channels in a spread spectrum communication system

Abstract: A method and apparatus is provided for transmitting spread spectrum signals. The transmitter receives data bits (200) at a particular rate. Subsequently, the transmitter encodes (202) the received data bits (200) at a predetermined encoding rate into data symbols (204). Subsequently, the transmitter derives (210) predetermined length orthogonal codes (212) from the data symbols (208). The transmitter accommodates variable received data bit rates by setting the predetermined encoding rate and the predetermined orthogonal code length in response to the received data bit rate. Subsequently, the transmitter spreads (216) the derived orthogonal codes (212) with a user PN spreading code (214). An alternative method and apparatus is provided for transmitting spread spectrum signals. The transmitter receives data bits (230) at a particular rate. Subsequently, the transmitter encodes (232) the received data bits (230) at a predetermined encoding rate into data symbols (234). Subsequently, the transmitter determines (248) a particular channel to transmit the data symbols (244) by spreading (248) the data symbols (244) with a predetermined length orthogonal code (246). The transmitter accommodates variable received data bit rates by setting the predetermined encoding rate and the predetermined orthogonal code length in response to the received date bit rate.

Method and apparatus for performing targeted interference suppression

Abstract: The invention relates to a communication system (300) having a receiver (304) that is capable of performing targeted interference suppression. An interference classifier (314) within the receiver (304) analyzes a signal received from a channel (306) and identifies and classifies interference components within the signal. An interference suppressor (316) then suppresses the interference components in the signal based on interference type. In one embodiment, the interference suppressor (316) includes a plurality of interference suppression modules that are each optimal for suppressing certain interference types. The interference suppressor (316) selects one of the interference suppression modules based on the type of interference present in the received signal. In another embodiment, a hybrid interference mitigation system (10) is provided by combining targeted interference suppression, frequency hopping adaptation, and processing gain adaptation.

Ontology mapping for the interoperability problem in network management

Abstract: Interoperability between different network management domains, heterogeneous devices, and various management systems is one of the main requirements for managing complex enterprise services. While substantial advances have been made in low-level device and data interoperability using common data formats and specifications such as simple network management protocol's (SNMP's) SMI and TMF's SID, various interoperability issues including semantic interoperability offer interesting research challenges. While semantic interoperability is a difficult problem in its own right, the semantic web that incorporates intelligent agents necessitates an interoperability solution requiring agents to communicate unambiguously and reason intelligently to perform cooperative management tasks. Agents need a formal representation of knowledge; an ontology is capable of modeling the rich semantics of the managed environment (and especially, relationships between managed entities) so that agents can act on them. This paper presents an ontology-driven approach for solving the semantic interoperability problem in the management of enterprise services, illustrated here with a router configuration management application.