Xiang Chen

US Patent:

7848221, Dec 7, 2010

Filed:

Jul 14, 2008

Appl. No.:

12/172462

Inventors:

Peilu Ding - Schaumburg IL, US
Ying Cai - Schaumburg IL, US
Xiang Chen - Rolling Meadows IL, US
Xiaowei Jin - Palatine IL, US
Ravindra P. Moorut - Barrington IL, US

Assignee:

Motorola Mobility, Inc. - Libertyville IL

International Classification:

H04J 11/00
H04B 7/185
H04B 1/10
H04B 15/00
H04W 4/00

US Classification:

370210, 370317, 370332, 375346, 455 631

Abstract:

Disclosed are a method and system for detecting adjacent channel interference between two systems having neighboring frequencies. The method and system calculates a Fast Fourier Transform (FFT) output for one or more upper and lower frequency side null subcarriers and center data subcarriers of a frequency channel. Power values are calculated for the upper and lower frequency side null subcarriers and the center data subcarriers for use in determining a presence of adjacent channel interference (ACI).

US Patent:

7860521, Dec 28, 2010

Filed:

Dec 26, 2007

Appl. No.:

11/964386

Inventors:

Xiang Chen - Rolling Meadows IL, US
Xiaowei Jin - Palatine IL, US
James F. Kepler - Buffalo Grove IL, US
Stephen L. Kuffner - Algonquin IL, US
Peijuan Liu - Palatine IL, US
Ravindra P. Moorut - Port Barrington IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 15/00

US Classification:

455501, 455 412, 455517, 455 631

Abstract:

A system and method for minimizing inter-communications system mobile-to-mobile station interference includes a plurality of base stations (BS A and BS B) and a plurality of mobile stations (MS A and MS B) each communicating with a base station using a first mode of communication. A first mobile station (MS A) sends a message using a second mode of communication upon detecting interference with another mobile station (MS B) to determine the source of the interference. Once determined, the first mobile station (MS A) communicates with its base station (BS A) which, in turn, communicates with the second mobile station's base station (BS B) using a back haul network. The second mobile station's base station (BS B) may then instruct the second mobile station (MS B) to alter its transmission characteristics based upon instructions from the second base station (BS B) in order to reduce interference and improve overall communications quality.

US Patent:

8285322, Oct 9, 2012

Filed:

Aug 5, 2009

Appl. No.:

12/536085

Inventors:

Xiang Chen - Rolling Meadows IL, US
Ying Cai - Schaumburg IL, US
Peilu Ding - Arlington Heights IL, US
Xiaowei Jin - Palatine IL, US
Ravindra P. Moorut - Port Barrington IL, US

Assignee:

Motorola Mobility LLC - Libertyville IL

International Classification:

H04W 72/00

US Classification:

455525, 4554521, 4554221, 370318

Abstract:

A system and method for minimizing interference for mobile devices operating in a communication network that includes a centralized controller and a number of femtocells, each femtocell including a base station. The method calculates a power assignment priority for each femtocell, and determines a priority order of the femtocells, the priority order based on the power assignment priority calculated for each femtocell. The method calculates a power to assign to the base station for each femtocell based on the priority order. The method allocates a first portion of the power assigned to the base station for each femtocell as required for real-time traffic, and a second portion of the power assigned to the base station for each femtocell as required for non-real-time traffic.

US Patent:

8401479, Mar 19, 2013

Filed:

Aug 5, 2009

Appl. No.:

12/536125

Inventors:

Ying Cai - Schaumburg IL, US
Xiang Chen - Rolling Meadows IL, US
Peilu Ding - Arlington Heights IL, US
Xiaowei Jin - Palatine IL, US
Ravindra P. Moorut - Port Barrington IL, US

Assignee:

Motorola Mobility LLC - Libertyville IL

International Classification:

H04B 1/00
H04B 15/00
H04L 12/28
H04B 7/00

US Classification:

455 631, 370254, 455512

Abstract:

A system and method for minimizing interference for mobile devices in a communication network that includes a macrocell base station and a femtocell having a base station. The method receives initialization data on a backhaul connection between the femtocell base station and the macrocell base station, and uses that data to configure the femtocell base station transmitting power. The method receives a user equipment identifier from a macrocell user equipment in the communication network, and determines whether the macrocell user equipment is authorized. If authorized, the macrocell user equipment is granted access to the femtocell base station. If unauthorized, user equipment information for the macrocell user equipment received on the backhaul connection is used to adjust the femtocell base station transmitting power to minimize the interference for mobile devices.

US Patent:

20080130620, Jun 5, 2008

Filed:

Feb 13, 2007

Appl. No.:

11/674504

Inventors:

Peijuan Liu - Patatine IL, US
Xiang Chen - Rolling Meadows IL, US
Ravindra P. Moorut - Barrington IL, US
Floyd D. Simpson - Lake Worth FL, US
Dominic M. Tolli - Libertyville IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 7/212

US Classification:

370347

Abstract:

The invention concerns a method () and device () for collision avoidance. The method can include the step of—in a multi-mode device () —conducting () a communication in accordance with an 802.16 communications protocol in which the 802.16 communication protocol communication includes only listening frames (). The method can also include the step of conducting () in the multi-mode device another communication in accordance with a Bluetooth communications protocol that supports extended synchronous connection-oriented mode. The method can also include the step of arranging () transmissions of the Bluetooth communication to avoid collisions with transmissions of the 802.16 communication.

US Patent:

20080130676, Jun 5, 2008

Filed:

Feb 13, 2007

Appl. No.:

11/674433

Inventors:

Peijuan Liu - Palatine IL, US
Xiang Chen - Rolling Meadows IL, US
Ravindra P. Moorut - Barrington IL, US
Floyd D. Simpson - Lake Worth FL, US
Dominic M. Tolli - Libertyville IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 12/413

US Classification:

370445

Abstract:

The invention concerns a method () and device () for collision avoidance using sleep frames (). The method can include the step of—in a multi-mode device ()—conducting () a communication in accordance with an 802.16 communications protocol in which the 802.16 communication protocol communication includes both listening frames () and sleep frames. The method can also include the step of conducting () in the multi-mode device another communication in accordance with a Bluetooth communications protocol that supports extended synchronous connection-oriented mode. The method can also include the step of arranging () transmissions of the Bluetooth communication to avoid collisions with transmissions of the 802.16 communication.

US Patent:

20080139212, Jun 12, 2008

Filed:

Dec 7, 2006

Appl. No.:

11/567744

Inventors:

Xiang Chen - Rolling Meadows IL, US
Aart Jan Geurtsen - Almere, NL
Gerrit W. Hiddink - Ultrecht, NL
Peijuan Liu - Palatine IL, US
Ravindra P. Moorut - Port Barrington IL, US
Harald Van Kampen - Nieuwegein, NL

Assignee:

MOTOROLA, INC. - LIBERTYVILLE IL

International Classification:

H04L 27/28
H04Q 7/20

US Classification:

455450, 375267

Abstract:

The various embodiments provide a mobile station having at least a first and a second radio transceivers wherein a medium access control (MAC) layer framework coordinates the transmission and reception of the at least a first and a second transceiver systems. In addition, the various embodiments employ asynchronous connectionless links (ACL) for voice traffic on a Bluetooth™ link rather than SCO links. A central scheduler () interfaces with a first MAC layer () and a second MAC layer (). By interacting with the MAC layers of both systems, the central scheduler () collects traffic information from both PHY layers at the buffer (), including transmission/reception timing, and Quality of Service (QoS) requirements for voice traffic. Based upon the collected information the central scheduler () will schedule transmissions by both systems in a non-time-overlapping manner so as to avoid radio frequency interference.

US Patent:

20130094381, Apr 18, 2013

Filed:

Oct 4, 2012

Appl. No.:

13/644411

Inventors:

Xiang Chen - Lake Zurich IL, US
Dengkun Xiao - Beijing, CN
Anjian Li - Shenzhen, CN

Assignee:

FUTUREWEI TECHNOLOGIES, INC. - Plano TX

International Classification:

H04W 24/10

US Classification:

370252

Abstract:

Signaling a Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ) measurement of a wireless channel is achieved by sending an measurement bandwidth (measbandwidth) indicator to a receiver that mandates a specific measurement bandwidth for performing the RSRP or RSRQ measurement. By virtue of receiving the measbandwidth indicator, the receiver is required to perform the RSRP or RSRQ measurement over a portion of the wireless channel that is equal to the measurement bandwidth specified by the measbandwidth indicator.