At&t Wireless Services, Inc.

At&t Mobility Ii LLC

Clearwire Corporation

At&t Intellectual Property I, L.p.

Clearwire Legacy LLC

At+t Corp.

Cingular Wireless Ii, LLC

Clearwire IP Holdings L.l.c.

Liang A Hong

Kamyar Moinzadeh

Elliott Hoole

Lakshmana Rao Chintada

David B Gibbons

Eamonn Gormley

Jin-Meng Ho

Kin K Leung

Herman Chien

Donald P Wahlstrom

Luong P Nguyen

Eliott Hoole

A data link layer tunneling technique improves the throughput of high speed data in noisy wireless environments. Recovering lost frames transmitted between a packet sending unit and a packet receiving unit in a data communications system generally comprises (a) identifying a failure to successfully receive a missed frame at the packet receiving unit; (b) establishing a logical tunnel channel at the packet receiving unit to acknowledge the next successfully received frame; (c) starting a first timer at the packet receiving unit; (c) upon receiving a tunnel establishment request from the packet receiving unit, the packet sending unit resending the missed frame on the logical tunnel channel and starting a second timer; and (d) the packet sending unit resending the missed frame a specified number of times until receiving an acknowledgement from the packet receiving unit.

Data link layer tunneling technique for high-speed data in a noisy wireless environment

Polling methods for use in a communication system, such as a fixed wireless communication system, are described. The fixed wireless communication system includes at least one wireless base unit and a plurality of fixed-location wireless transceiver units, where each transceiver unit is, for example, located at a home residence and coupled to a personal computer (PC). In one particular polling method, a wireless transceiver unit detects a failure of a primary energy source, switches to a battery backup for power, and sends a message to the wireless base unit indicating such failure. The message initiates the wireless base unit to poll the wireless transceiver unit on a periodic basis for status information. During the failure, a data traffic channel established between the units is torn down to conserve power at the wireless transceiver unit. Once the primary energy source is restored, the data traffic channel is brought back up and the periodic polling is terminated. Similar methods are applied in connection with the detection of a communication failure over the data traffic channel.

Polling methods for use in a wireless communication system

In accordance with the invention, a data link layer tunneling technique is disclosed for improving the throughput of high speed data in noisy wireless environments. The method for recovering lost frames transmitted between a packet sending unit and a packet receiving unit in a data communications system, and generally comprises the steps of: (a) identifying a failure to successfully receive a missed frame at the packet receiving unit; (b) establishing a logical tunnel channel at the packet receiving unit to acknowledge the next successfully received frame; (c) starting a first timer at the packet receiving unit; (c) upon receiving a tunnel establishment request from the packet receiving unit, the packet sending unit resending the missed frame on the logical tunnel channel and starting a second timer; and (d) the packet sending unit resending the missed frame a specified number of times until receiving an acknowledgement from the packet receiving unit.

A method of operating a communication system is disclosed. The method includes transmitting from a remote unit to a base station remote unit channel data. The remote unit channel is generated at the remote unit and includes data about a first portion of communication channels on which the call can be executed. The method also includes applying a channel selection method to the remote unit channel data and to base station channel data so as to select a communication channel from among the first portion of communication channels. The base station channel data is generated at the base station and includes data about a second portion of the communication channels. The method further includes executing a call on the selected communication channel.

Establishing a communication channel in a wireless network

The present invention provides methods for improving the performance and efficiency of time sharing wireless networks by reducing collisions, eliminating wasted bandwidth caused by unnecessary gaps between transmissions, and reducing the amount of control information broadcast from the base station. The present invention accomplishes this by synchronizing the actions of the remote units in the wireless network to the control messages sent by the base unit and having the base unit compensate for the inherent system latency in determining when control messages should be sent. The present invention also consolidates the functionality of some of the control messages in order to reduce bandwidth usage.

Method for improving efficiency in a time sharing network

A method and an apparatus provide for controlled access to a shared communication medium. Time slots on a forward channel include information regarding status useful for remote units to determine whether a reverse channel is available for seizure. Additionally, information along the forward channel provides guidance to the remote units to control attempts to seize the reverse channel. In one embodiment a remote unit divides a data package into a plurality of portions and attempts to seize the reverse channel using a single portion of the data package which corresponds to one time slot on the reverse channel. It then waits until it receives notification along the forward channel that the first data portion was successfully received before it attempts to send any of the remainder of its data in consecutive time slots on the reverse channel.

Method and apparatus for controlling access to a communication channel

In accordance with the invention, a data link layer tunneling technique is disclosed for improving the throughput of high speed data in a noisy wireless environment. The method for recovering lost frames transmitted between a packet sending unit and a packet receiving unit in a data communications system, and generally comprises the steps of: (a) identifying a failure to successfully receive a missed frame at the packet receiving unit; (b) establishing a logical tunnel channel at the packet receiving unit to acknowledge the next successfully received frame; (c) starting a first timer at the packet receiving unit; (c) upon receiving a tunnel establishment request from the packet receiving unit, the packet sending unit resending the missed frame on the logical tunnel channel and starting a second timer; and (d) the packet sending unit resending the missed frame a specified number of times until receiving an acknowledgement from the packet receiving unit.

A method has been provided for using the broadcast channel of a wireless multiple access network to communicate network timing information, or a time-stamp, to remote units. The method defines a broadcast channel protocol which divides communication frames into units called broadcast channel (BC) superframes. Each broadcast channel superframe is given a unique identification number, called a superframe count, which is transmitted by each base station. Then, both the network base stations and remote units can record events using the known superframe count. A method is also disclosed for the network to assign 14-bit identification numbers to remote units being installed into the network, so that communications can be conducted with installed remote units using the identification numbers instead of the 32-bit hardware serial numbers.

System and method for broadcasting timing information to remote units in a wireless multiple access network

A wireless communication system having a base unit and a plurality of remote transceiver units utilizes a dynamic time slot assignment scheme for channel access. The base unit receives and processes a channel access request message from a remote transceiver unit and prepares a channel measurement request message in response. If an Mtime slot of a time frame is available, the base unit sends this message in the Mtime slot and receives a message having channel measurement data in the Mtime slot of the next time frame. On the other hand, if the Mtime slot of the time frame is already reserved, the base unit sends the message in an Ntime slot of the time frame and receives a message having the channel measurement data in the Ntime slot of the next time frame. The base unit selects, based on the channel measurement data, an appropriate channel for communication for the remote transceiver unit. Continuing with use of the dynamic slot assignment, the base unit sends a message having a channel identifier associated with the selected channel and receives an acknowledgement from the remote transceiver unit in response.

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Redmond, WA, United States of America

Liang A Hong