Sreevalsan Vallath

20130094371, Apr 18, 2013

Oct 12, 2011

13/271845

Sreevalsan Vallath - Dublin CA, US
Arthur Brisebois - Cumming GA, US

AT&T MOBILITY II LLC - Atlanta GA

H04W 4/00
H04W 24/00

370252, 370328

A system and methodology that can limit and manage the number of multiple radio access bearer (mRAB) initiations, which are transitions from a Circuit Switched (CS) voice session, is provided. Moreover, the system, within a Radio Access Network (RAN), can identify vulnerable radio conditions for a user equipment (UE) on an uplink (UL) and/or a downlink (DL), and then subsequently determines whether a Packet Switched (PS) data session is allowed to pass through to the UE, during a CS voice call. In addition, the system can temporarily block a network-initiated data request to the existing CS voice call, if the voice call is likely to be dropped on initiating an mRAB. As the vulnerable radio conditions improve, the system can deliver the previously blocked data request to the UE.

20130286853, Oct 31, 2013

Mar 26, 2013

13/851016

Johnson O. Sebeni - Cupertino CA, US
Li Su - Cupertino CA, US
Navid Damji - Cupertino CA, US
Paul V. Flynn - Cupertino CA, US
Sarma V. Vangala - Cupertino CA, US
Sreevalsan Vallath - Cupertino CA, US
Thanigaivelu Elangovan - Cupertino CA, US
Zhu Ji - Cupertino CA, US

H04W 24/02

370242

Methods and apparatus for network-based detection and mitigation of hybrid client device reception outage events. For example, in one embodiment, a cellular device uses a single-radio solution to support circuit-switched calls on a CDMA 1X network and packet-switched calls on LTE. Periodically, the cellular device tunes away from LTE and monitors CDMA 1X activity, and vice versa. During these tuned-away periods, the network adjusts operation to mitigate adverse effects (e.g., underutilization of radio resources, synchronization loss, etc.).

20130294417, Nov 7, 2013

Apr 9, 2013

13/859657

Prashant H. Vashi - Cupertino CA, US
Jianxiong Shi - Cupertino CA, US
Sreevalsan Vallath - Cupertino CA, US

H04W 40/24

370335, 370329

Methods and apparatus for intelligent scheduling in hybrid networks based on client identity. For example, in one embodiment, the hybrid networks are cellular networks (e.g., LTE and CDMA 1X), and a cellular device uses a single-radio solution to support circuit-switched calls on a CDMA 1X network and packet-switched calls on LTE. Periodically, the cellular device tunes away from LTE and monitors CDMA 1X activity, and vice versa. The LTE network can infer the cellular device's tune away schedule, based on the device's identity, and the paging schedule algorithm of the CDMA 1X network.

20130310091, Nov 21, 2013

Sep 7, 2012

13/606051

Tarik Tabet - Los Gatos CA, US
Paul V. Flynn - Menlo Park CA, US
Syed A. Mujtaba - Santa Clara CA, US
Navid Damji - Cupertino CA, US
Zhu Ji - San Jose CA, US
Sreevalsan Vallath - Dublin CA, US

H04B 15/00
H04W 4/00

455501

Outer loop link adaptation for device resumption. A user equipment (UE) and base station (BS) may be in communication in a first network (e.g., an LTE network). Communication between the UE and the BS may be interrupted, e.g., due to a long fading environment, the UE tuning away to a second network (e.g., a CDMA network). Accordingly, the measured error rate may increase dramatically. After resumption from the interruption, a negative offset may be applied to a reported SINR value from the UE due to the previous increase in error rate. Upon improvement in the error rate, a larger, positive offset adjustment may be added to the negative offset, allowing the estimated SINR to return to reported SINR more quickly. Additionally, the error rate estimation may be adjusted to converge to a more recently measured more quickly by decreasing a feedback filter coefficient.

20130310092, Nov 21, 2013

Oct 30, 2012

13/663653

Paul V. Flynn - Menlo Park CA, US
Syed A. Mujtaba - Santa Clara CA, US
Navid Damji - Cupertino CA, US
Zhu Ji - San Jose CA, US
Sreevalsan Vallath - Dublin CA, US

APPLE INC. - Cupertino CA

H04B 15/00
H04W 24/02

455501, 455517

Outer loop link adaptation for device resumption. A user equipment (UE) and base station (BS) may be in communication in a first network (e.g., an LTE network). Communication between the UE and the BS may be interrupted, e.g., due to a long fading environment, the UE tuning away to a second network (e.g., a CDMA network). Accordingly, the measured error rate may increase dramatically. After resumption from the interruption, a negative offset may be applied to a reported SINR value from the UE due to the previous increase in error rate. Upon improvement in the error rate, a larger, positive offset adjustment may be added to the negative offset, allowing the estimated SINR to return to reported SINR more quickly. Additionally, the error rate estimation may be adjusted to converge to a more recently measured more quickly by decreasing a feedback filter coefficient.

20130315119, Nov 28, 2013

Aug 31, 2012

13/602067

Tarik TABET - Los Gatos CA, US
Paul V. Flynn - Menlo Park CA, US
Sreevalsan Vallath - Dublin CA, US
Kee-Bong Song - San Diego CA, US
Syed A. Mujtaba - Santa Clara CA, US
Li Su - San Jose CA, US

Apple Inc. - Cupertino CA

H04W 72/12
H04W 52/02

370311, 370329

A method is disclosed for coordinating a user equipment's communication with a network during tune back with C-DRX (connected mode discontinuous receive). When a user equipment tunes back to a network after a tune away or a signal fade, a scheduling request is sent to the network to indicate the tune back as quickly as possible. The user equipment waits for a downlink transmission from the network. When the user equipment does not receive the downlink transmission, the method determines if the connection between the user equipment and the network has been released. The sending of the first scheduling request and any additional scheduling requests is coordinated with the C-DRX configuration so as to maximize the battery savings of C-DRX and minimize the latency of the tune back process in case the user equipment has uplink data to send.

20140016490, Jan 16, 2014

Jul 11, 2013

13/940154

Navid Damji - Cupertino CA, US
Sreevalsan Vallath - Dublin CA, US
Sarma V. Vangala - San Jose CA, US
Samy Khay-Ibbat - San Francisco CA, US

H04W 24/10

370252

A method for handling a missed rank report during a tune-away period is provided. The method can include a wireless communication device tuning away from a first network to a second network for a tune-away period; returning to the first network from the tune-away period; determining that a scheduled rank report was missed during the tune-away period; generating a Channel State Indicator (CSI) report based on a previously defined Rank Indicator (RI) value known to the first network in response to missing the scheduled rank report; and sending the CSI report to the first network.

20140044046, Feb 13, 2014

Aug 13, 2013

13/966203

Sreevalsan Vallath - Dublin CA, US
Swaminathan Balakrishnan - Sunnyvale CA, US

Apple Inc. - Cupertino CA

H04W 28/02

370328

A method for reducing packet loss during data transfer from a network to a wireless communication device over a connection is disclosed. The method can include the wireless communication device signaling a first receive window size for a data transfer; determining occurrence of an event resulting in an interruption of the connection; and, in response to determining occurrence of the event, signaling a second receive window size for the data transfer prior to the event to trigger an adjustment of a data rate of the data transfer in preparation for the event.