Google Inc.

Motorola Corporation

Motorola Mobility LLC

Motorola Solutions, Inc.

Bogdan O Carbunar

Michael D Pearce

Venugopal Vasudevan

Loren J Rittle

Michael L Needham

George Calcev

Madjid F Nakhjiri

Yang Yu

Shivajit Mohapatra

Weidong Shi

A method and apparatus for downloading content within a video-on-demand system is provided herein. During operation a Video Home Office (VHO) will cache a subset of the Video Service Office (VSO) content. When a user requests content that is not stored on the VHO, the VHO will request that content from another VHO or the VSO. In order to reduce the additional network load imposed during item forwarding while attempting to balance the total load on all the links interconnecting the VSO and VHOs, recorded traffic history metrics are used to predict their future or current traffic. A VHO or VSO is chosen for fetching the content that will result in the lowest predicted traffic on the interconnecting links.

Cache eviction

Caching content

Method and apparatus for transferring content

Communication nodes, acting as intermediate routers for communication packets transmitted between a source node and a destination node, are provided with different access rights to the fields of the routed communication packets. Routes of intermediate routers between the source node and the destination node are discovered and the identities of intermediate routers on the discovered routes are collected. The aggregate trust levels of the intermediate routers are computed allowing the most trusted route to be selected. Encryption keys are securely distributed to intermediate routers on the most trusted route based on the trust level of the intermediate routers and fields of the communication packets are encrypted with encryption keys corresponding to the assigned trust level. Intermediated nodes are thereby prevented from accessing selected fields of the communication packets.

Method and apparatus for dynamic, seamless security in communication protocols

During each node's awake period, each node multicasts the relative time or slot of their next awake period (beaconing interval) to all neighboring nodes. This enables each node to intelligently and independently schedule the time slot of its next transmission based on the beaconing intervals of the nodes it has heard from. During each active (awake) interval, a node builds statistics of the future transmission/receive times of its neighbors and uses them to determine its next transmission time. In one proposed implementation, at the end of an active interval, a node picks the time slot with the highest counter for its next transmission. In another proposed implementation, at the end of an active interval, a node picks one of the slots with a weighted probability; the weight of each slot is proportional with the value of the counter associated with the slot.

Method and apparatus for synchronizing nodes

During operation, each client device will be provided with a list of addresses for all nodes within a network. The addresses for all nodes will be unique to a particular client device such that {address(node), address(node), . . . address(node n)} for a first client does not equal {address(node), address(node), . . . address(node n)} for a second client. Each client's address for a particular node will preferably only be known by the client and a naming server. When sending a message to a destination node, a client device will create a source route consisting of the unique addresses. Because each client's address for a particular node will only be known to itself and the naming server, anyone who intercepts the route will not know what nodes along the route are used for routing the message.

Method and apparatus for performing anonymous source routing

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Elmhurst, IL, United States of America

Bogdan O Carbunar