Nandish M Chalishazar

US Patent:

7437176, Oct 14, 2008

Filed:

Mar 15, 2005

Appl. No.:

11/080768

Inventors:

Hector M. Ribas - Overland Park KS, US
Jason P. Sigg - Olathe KS, US
Meng Y. Yew - Olathe KS, US
Abhijit V. Apte - Overland Park KS, US
Nandish M. Chalishazar - Lenexa KS, US

Assignee:

Sprint Spectrum L.P. - Overland Park KS

International Classification:

H04B 7/00

US Classification:

455522, 455 69, 455 631, 455126

Abstract:

A method and system are disclosed for reducing pilot pollution in a wireless communication system by systematically (i) identifying areas of sector overlap and (ii) for each area, adjusting power allocation in one or more of the overlapping sectors so as to create a dominant sector and to reduce the total noise from other sectors. A preferred embodiment of the invention involves collecting RF performance data, filtering the data to focus on areas having threshold low forward link data rate, further filtering the data to focus on areas in which the low forward link data rate is likely the result of pilot pollution, selecting a geographic region in which to make a sector power adjustment, and making a sector power adjustment in the selected region in an effort to reduce pilot pollution and increase forward link data rate. The invention is particularly advantageous in a hybrid EV-DO/1xRTT system.

US Patent:

7551586, Jun 23, 2009

Filed:

Mar 28, 2005

Appl. No.:

11/091299

Inventors:

Meng Y. Yew - Olathe KS, US
Hector M. Ribas - Overland Park KS, US
Jason P. Sigg - Olathe KS, US
Abhijit V. Apte - Overland Park KS, US
Nandish M. Chalishazar - Lenexa KS, US

Assignee:

Sprint Spectrum L.P. - Overland Park KS

International Classification:

H04W 4/00
H04B 7/216
H04M 1/00
H04W 36/00

US Classification:

370332, 370335, 4555521, 4555531, 455436

Abstract:

A method and system for using data rate as a basis to allow or deny handoff from an IS-856 (e. g. , EV-DO) communication system to an IS-2000 (e. g. , 1xRTT) communication system. A base station detects that a hybrid terminal has received a threshold low forward link IS-856 data rate for a threshold time period, and the base station will responsively evaluate the IS-2000 system to determine if the IS-2000 system has sufficient resources to provide at least as good a data rate as the IS-856 threshold data rate. If the base station thereby determines that the IS-2000 system is a good alternative, then the base station will allow a handoff to occur when the terminal seeks to handoff to IS-2000. On the other hand, if the base station thereby determines that the IS-2000 system is not a good alternative, then the base station will not allow the handoff to IS-2000.

US Patent:

7738427, Jun 15, 2010

Filed:

May 6, 2009

Appl. No.:

12/436539

Inventors:

Meng Y. Yew - Olathe KS, US
Hector M. Ribas - Overland Park KS, US
Jason P. Sigg - Olathe KS, US
Abhijit V. Apte - Overland Park KS, US
Nandish M. Chalishazar - Lenexa KS, US

Assignee:

Sprint Spectrum L.P. - Overland Park KS

International Classification:

H04W 4/00
H04B 7/216
H04M 1/00
H04W 36/00

US Classification:

370332, 370335, 4555521, 4555531, 455436

Abstract:

A method and system for using data rate as a basis to allow or deny handoff from a communication system operating under a first air interface protocol (first protocol system) to a communication system operating under a second air interface protocol (second protocol system). A base station detects that a hybrid terminal has received a threshold low forward link data rate under the first protocol for a threshold time period, and the base station responsively evaluates the second protocol system to determine if the second protocol system has sufficient resources to provide at least as good a data rate as the threshold data rate. If the base station thereby determines that the second protocol system is a good alternative, then the base station will allow a handoff to occur when the terminal seeks to handoff to the second protocol. Otherwise, the base station will not allow the handoff to occur.

US Patent:

7894816, Feb 22, 2011

Filed:

Aug 30, 2007

Appl. No.:

11/848035

Inventors:

Nandish M. Chalishazar - Lenexa KS, US
Hector M. Ribas - Overland Park KS, US
Jason Sigg - Olathe KS, US
Meng Y. Yew - Lenexa KS, US
Abhijit V. Apte - Overland Park KS, US

Assignee:

Sprint Spectrum L.P. - Overland Park KS

International Classification:

H04W 36/00

US Classification:

455439, 455436, 455442, 455445, 370331, 370342, 370338, 370328

Abstract:

A mobile station in an idle state is associated with a current sector-carrier that has a current pilot channel at a current carrier frequency. In response to a request to originate a call, the mobile station compares its current sector-carrier with one or more candidate sector-carriers that have pilot channels at carrier frequencies distinct from the current carrier frequency. The mobile station measures received signal strengths of the current carrier frequency and the one or more candidate carrier frequencies and measures pilot signal levels of the current pilot channel and the one or more candidate pilot channels. If a candidate sector-carrier has a carrier frequency with a received signal strength that exceeds that of the current sector-carrier, and has a pilot channel with a pilot signal level that exceeds that of the current sector-carrier, the mobile station uses that candidate sector-carrier to transmit a call origination message.

US Patent:

7937103, May 3, 2011

Filed:

Mar 11, 2005

Appl. No.:

11/078845

Inventors:

Jason P. Sigg - Olathe KS, US
Meng Y. Yew - Olathe KS, US
Hector M. Ribas - Overland Park KS, US
Abhijit V. Apte - Overland Park KS, US
Nandish M. Chalishazar - Lenexa KS, US

Assignee:

Sprint Spectrum L.P. - Overland Park KS

International Classification:

H04B 7/00

US Classification:

455522, 455 6711

Abstract:

A method and system are disclosed for dynamically adjusting forward-link transmission power in a cellular wireless communication system. A base station controller (BSC) or other radio network entity determines that a given cell sector is transmitting data to at least one mobile station and that no cell sector in a cluster associated with the given cell sector (e. g. , among neighboring sectors) is also transmitting data to at least one mobile station. In response, the BSC dynamically increases the forward-link transmit power in the given sector to a level beyond the sector's normal (full) transmit power. The invention preferably applies on a per-timeslot basis and the power increase occurs in at least a data channel segment, to help increase data transmission speed.

US Patent:

7945281, May 17, 2011

Filed:

Mar 11, 2005

Appl. No.:

11/078677

Inventors:

Jason P. Sigg - Olathe KS, US
Meng Y. Yew - Olathe KS, US
Hector M. Ribas - Overland Park KS, US
Abhijit V. Apte - Overland Park KS, US
Nandish M. Chalishazar - Lenexa KS, US

Assignee:

Sprint Spectrum L.P. - Overland Park KS

International Classification:

H04B 7/00

US Classification:

455522, 455 6711

Abstract:

A method and system are disclosed for dynamically adjusting forward-link transmission power in a cellular wireless communication system. A base station controller (BSC) or other radio network entity determines that a given cell sector a given sector is serving at least one active mobile station while no other sector in a cluster of sectors associated with the given sector is also serving at least one active mobile station. In response, the BSC dynamically increases the pilot transmit power in the given sector to a level beyond the sector's normal (full) transmit power, in an effort to increase requested data transmission speed in the sector.

US Patent:

7302265, Nov 27, 2007

Filed:

Mar 16, 2005

Appl. No.:

11/081272

Inventors:

Nandish M. Chalishazar - Lenexa KS, US
Hector M. Ribas - Overland Park KS, US
Jason Sigg - Olathe KS, US
Meng Y. Yew - Lenexa KS, US
Abhijit V. Apte - Overland Park KS, US

Assignee:

Sprint Spectrum L.P. - Overland Park KS

International Classification:

H04Q 7/20

US Classification:

455439, 455436, 455442, 455434, 4553522, 370328, 370338

Abstract:

A mobile station in an idle state is associated with a current sector-carrier that has a current pilot channel at a current carrier frequency. In response to a request to originate a call, the mobile station compares its current sector-carrier with one or more candidate sector-carriers that have pilot channels at carrier frequencies distinct from the current carrier frequency. The mobile station measures received signal strengths of the current carrier frequency and the one or more candidate carrier frequencies and measures pilot signal levels of the current pilot channel and the one or more candidate pilot channels. If a candidate sector-carrier has a carrier frequency with a received signal strength that exceeds that of the current sector-carrier, and has a pilot channel with a pilot signal level that exceeds that of the current sector-carrier, the mobile station uses that candidate sector-carrier to transmit a call origination message.

US Patent:

20210084698, Mar 18, 2021

Filed:

Sep 14, 2020

Appl. No.:

17/019792

Inventors:

- Hickory NC, US
Nandish Chalishazar - Nashua NH, US
Devulapalli Venkata Surya Narayana Murthy - Bangalore, IN

Assignee:

CommScope Technologies LLC - Hickory NC

International Classification:

H04W 76/11
H04W 76/27
H04W 76/19
H04W 48/16

Abstract:

A base station for performing physical cell identifier (PCI) collision detection. The base station includes at least one processor configured to determine whether a PCI in a radio resource control (RRC) re-establishment message is the same as a PCI used by a cell implemented by the base station. The at least one processor is also configured to determine whether a cell radio network temporary identifier (C-RNTI) in the RRC Re-establishment message is outside a reserved range of C-RNTIs for the cell. The at least one processor is also configured to identify a possible PCI collision for the cell when (1) the PCI in the RRC Re-establishment message is the same as a PCI used by the cell; and (2) the C-RNTI in the RRC Re-establishment message is outside the reserved range of C-RNTIs for the cell.