Xg Technology, Inc.

Amit Shukla

Shashidhar R Gandham

Hai Trong Vu

Shih-Chun Chang

Jinu Kurian

A mechanism for decreasing the latency in an IP address assignment process for mobile systems using IP as network layer protocol is described. The proposed system is aimed at supporting seamless hand-offs for real-time applications like VOIP. A set of optimized messages is defined to eliminate the need for exchanging long DHCP messages to acquire an IP address. The mechanism involves splitting the IP address assignment functionality into two parts, with the base station being responsible for assigning IP addresses to individual end user devices, and the Mobile Switching Center assigning a block of IP addresses to each base station.

Proxy based approach for IP address assignment to decrease latency of hand-offs in mobile IP telephony

A mechanism is disclosed where a Base Station provides assistance to a mobile device in the channel-switch process because a mobile device might have to perform frequent channel switches to overcome adverse channel conditions due to interference in the 900 MHz ISM band. The Base Station broadcasts channel-specific information that will be used by all mobile devices to accurately select prospective channels for future channel-switches, thereby cutting down the latency that is experienced during an actual switch.

Methodology for base station assisted channel selection for interference handling in mobile networks

In wireless networks where multiple base stations are deployed, handsets may handoff from one base station to the other while in a voice call. In this disclosure a layer-2 hand-off mechanism for cellular systems designed to operate in unlicensed spectrum is described. More specifically a proposed method that does not use any pre-determined thresholds to initiate the hand-offs is disclosed.

Threshold-less mobile-driven handoff method for cellular systems using unlicensed spectrum

An extension to a heterogeneous MAC protocol that makes provisions for multi-frequency system architecture is described. A new frame structure for a multi-frequency xMAX system is introduced. Multi-frequency xMAX system is an extension of a single-channel xMAX system, where the available bandwidth is split into multiple channels to provide additional capacity and range. The new frame structure is followed by all channels and is designed to fulfill the requirements of multiple frequency operation. The new frame structure incorporates features that allow the handset to leverage the advantages of multiple frequency channels, especially in the event of interference. Also, a new mechanism to reduce the power consumption in the handset is discussed that significantly reduces the number of unnecessary receive operations at the handset.

Method for extending a heterogeneous MAC protocol to multi-channel systems

This disclosure describes a new Medium Access Control (MAC) protocol that combines contention-free and contention-based MAC protocols into a heterogeneous MAC protocol used for forwarding VoIP traffic in VoIP systems on wireless networks using multiple base stations which addresses the need to transport high bit-rate data to multiple users over wired and wireless means.

Heterogeneous MAC protocol for multiple base stations in wireless networks

This disclosure describes a provisional hand-off mechanism to transfer handsets between base stations for a MAC protocol that combines contention-free and contention-based MAC protocols for use in wireless VoIP systems with multiple base stations that reduces packet overhead thus allowing for transmission of high bit-rate data to multiple users over wired and wireless means.

Provisional hand-off mechanism in a heterogeneous MAC protocol for wireless networks

An element-based method to automatically configure mobile handsets by the base station using a protocol that combines contention-free and contention-based MAC protocols for use in wireless VoIP systems with multiple base stations is disclosed.

Element-based method for auto-configuration of handsets by a base station in a heterogeneous MAC protocol for wireless networks

In this disclosure a technique of base station assisted mobility detection of handsets is described. More specifically by transmitting the subnet ID in the Beacon, a base station simplifies the process of network detection. This also leads to a significant reduction in handoff latency by giving the handset ample time to prepare for the impending handoff.

System and method for base station assisted mobility detection for mobile handsets

A scanning technique to select the best channel a mobile handset needs when approaching handoff is described. More specifically a system and method for an adaptive proactive scanning mechanism in which the rate of scanning is determined by the necessity to handoff and battery power is disclosed.

System and method for adaptive proactive scanning to support fast handoffs in mobile networks

A technique for network entry in multi-channel mobile systems is described. The procedure utilizes the channel specific information sent in the beacon of each channel to select a subset of suitable channels. It then proceeds to scan these channels to gather information on perceived interference and received signal strength. Based on collected information the device picks the most suitable channel for joining the network. Since the channels to be scanned are pre-selected based on information seen in the beacon, the overall scan latency is reduced, thereby leading to a faster and more successful network entry.

Network entry procedure in multi-channel mobile networks

This disclosure describes a new interference avoidance Medium Access Control (MAC) protocol that combines contention-free and contention-based MAC protocols into a heterogeneous MAC protocol used for forwarding VoIP traffic in VoIP systems on wireless networks using multiple base stations which addresses additional interference elimination and the need to transport high bit-rate data to multiple users over wired and wireless means.

A tri-core architecture for reducing MAC layer processing latency at the base stations is described. The new architecture minimizes the processing delay by introducing a pipelined approach. The fundamental concept involves splitting the Medium Access Control (MAC) layer functionality into three distinct tasks, with each processor performing a given task. All tasks will be thus performed concurrently, avoiding much of the overhead encountered while processing received packets and preparing packets to be transmitted.

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Sunrise, FL, United States of America

Amit Shukla