Olympus Corporation

Qualcomm Incorporated

Alaa Muqattash

Ghobad Heidari-Bateni

Saishankar Nandagopalan

Ranganathan Krishnan

Abu Amanullah

Dinesh Dharmaraju

Michael Buyanin

Takayasu Fukuda

Arjunan Rajeswaran

Ghoabad Heidari-Bateni

Systems and methods for improving network performance. A method of transmitting packet data across a network includes a transmitting network device establishing a reservation to transmit traffic to a plurality of wireless receiving network devices across a network; the transmitting network device transmitting a sequence of packets across the network, wherein a packet of the sequence of packets includes data requesting the receivers acknowledge receipt of the packet; the transmitting network device waiting for a predetermined time to receive acknowledgement of receipt of the packet from the wireless receiving network devices; the transmitting network device retransmitting a packet across the network only if it does not receive an acknowledgement for that packet from any of the wireless receiving network devices within the predetermined time.

Methods and systems for data communication over wireless communication channels

Embodiments describe scheduling communication in an ad hoc multihop network. Included is a reservation based Medium Access Control (MAC) protocol that has resources scheduled along the path from source to destination. Admission control is performed on a per-hop basis and a decision is made, in a distributed manner, if enough resources exist along the multihop path to admit a new communication.

Reservation based MAC protocol

The present invention provides systems and methods are provided to allow a network device to simultaneously monitor multiple adjacent wireless physical layer channels. If network communications are discovered on an adjacent channel, the network device may move to this adjacent channel. Accordingly, the network device is able to discover other devices or services existing on the adjacent channel, and is able to avoid interference caused by adjacent channels coexisting on the same frequency bands. After moving to the adjacent channel, a standard MAC protocol is able to regulate channel excess amongst all the network devices coexisting on the new channel.

System and method for detecting adjacent channel devices or interference

According to an embodiment of the invention, a system and method to provide alignment of hibernation and active cycles is provided. When one device receives a beacon from one of its neighbors it can be implemented to check for the neighboring device's global cycle start countdown value and to compare it's global cycle start countdown value with its own. If the beacon from the neighboring device contains a global cycle start countdown value that is different from the device's own global cycle start countdown, the device can be implemented to check a predefined condition. For example, if a device's global cycle start time falls into the first half of a neighbor's global cycle, then the device changes its own global cycle start time to the global cycle start time of that neighbor. In another embodiment, if a device's global cycle start time falls into the first 256/K superframes of a neighbor's global cycle, then the device changes its own global cycle start time to the global cycle start time of that neighbor. In one embodiment, K can be the number of different global active cycle start times observed by the device.

Power save system and method

According to various embodiments of the invention a device can announce broadcast traffic in a global access period. Thus, a destination can change its local communication window every global access period. By announcing a local communication window during a global access period it can be more likely that a source device in a network will receive the information because all devices should be active during the global access period. A device can awaken for its local communication window and during the local communication window a source device can schedule a transmission and transmit information to the device.

The present invention provides a method for managing power of devices on a network. The method comprises: transmitting a first weighted value and a first anchor status of a first device on the network to a second device on the network, wherein the second device is a neighboring device to the first device; receiving a second weighted value and a second anchor status from the second device; and setting one of the devices as an anchor device based on one or more of weighted values and the anchor statuses, wherein the anchor device is configured to either wake up at predetermined times or to remain active.

System and method for power management

According to an embodiment of the invention the timing of one or more local communication windows can be defined using equations such that one or more local communication windows for two or more devices overlap. For example the periods between two consecutive local communication windows can be defined using a periodic equation such as: LAP Cycle Period=&#x394;*2. In this equation n=0, 1, 2, . . . , N, where N and &#x394; can be fixed. For example, N and &#x394; can be numbers that are predetermined for a given network, a given set of network devices, etc. In one embodiment every device can become active every &#x394;*2superframes. The frequency (n) can be determined based on, for example, incoming or outgoing message traffic, power consumption needs, etc.

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San Diego, CA, United States of America

Alaa Muqattash