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Elevate Test
Framework
Jan 2014 – Present
Spirent Communications.
Currently working with Spirent Communications in the Access Network
Layer3 of the Spirent’s Elevate LTE Test framework. Involved in the
following.
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Added multi-ue and multi-bearer support to the Layer3
code and integrated it with the layer2. Attached, transferred data and
system tested with 2 UE’s simultaneously.
·
Design and Development of the Reestablishment
procedure in Layer3.
·
Implemented the Radio-Link failure procedure and it’s
interactions with reestablishment in Layer3.
·
System testing with Volte calls (audio and video)
between two mobiles connected to the Elevate test framework. Analysis of
end to end logs, RRC/NAS Call flows, SIP exchanges for call establishment
and release. Simultaneous data transfers with the Volte calls and analysis
of Layer 2 Logs.
·
Involved in the derivation, review, update(features)
and execution of the system test plan.
·
Interfaced with the Layer2 team over implementation
and integration of TDD in the system.
·
Acted as a point of contact between Spirent’s product
specialists posted at the customer sites (supporting the Elevate Framework)
and the Spirent development teams of the various components of the system.
Analyzed the logs from the customers, raised and managed change request for
the bugs/enhancements and own them till the issue is resolved and accepted
by the customer. Fixed customer issues assigned to the Layer 3 team.
MACRO, LTE
Solution
Jul 2013 – Dec 2013
AltioStar Networks.
Worked with the AltioStar Networks as an individual contributor in
the Access Network Layer2. Involved in the following.
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Design and Development of Handover and Reestablishment
in the MAC-RLC.
·
Design and development of the uplink power control
feature in Layer2.
·
Taking Technical interviews.
·
Imparting Technical sessions and mentoring the members
of the team in LTE access network, MAC-RLC design.
Powerwave Pico LTE
Solution
June 2012 – May 2013
Powerwave Technologies, Inc.
Worked with the Powerwave Technologies, Inc. as a Principal Engineer.
Primary responsibility of development of RRM/CallControl component,
Integration (with L1/L2/L3 stack from different vendors) and delivering
Access network LTE Pico solution.
·
Design and Development of RRM and call control for
various features like Link Adaptation, MIMO, L2/L3 Measurements (KPI).
·
Integration of in-house RRM, Call Control and OAM with
the LTE Access network protocol stack from different vendors.
·
Analysis and resolution of bugs spanning multiple
access network Layers.
·
Support the product validation team for the testing of
the base station.
·
Mentoring the members of the team in LTE access
network.
ENodeB Call
Processing
Oct 2011 – April 2012
Cygnus Broadband
Cygnus Broadband (now known as Wilan Labs) is a US based (San Diego)
startup working primarily towards optimizing the mobile Quality of
Experience (QoE), streaming video optimization and physical layer (PHY)
capacity enhancements for wireless networks
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Enhancement of HLD and Product definition documents
for Cell control and UE Call control.
·
Integration and review of the code and artifacts
produced by the vendors.
·
Testing and Debugging of the implemented call flows.
LTE MAC Layer development(TDD) for a Leading Equipment
Manufacturer May 2010-
Mar2011
Aricent Technologies
Development and testing of the TDD LTE MAC Layer for
eNodeB and support for Interoperability Testing (IOT) with UE.
·
As a Senior Tech. Lead, I had the technical
Responsibility for overall delivery of LTE TDD MAC Layer.
·
Identification and analysis of the differences between
FDD and TDD MAC layer. Production of the requirements specification
document for the same.
·
Reverse engineering of the existing FDD MAC code and
identified best possible way to convert it into TDD system. Production of
the design artifacts like the design document, timing diagrams,
data/control flow diagrams.
·
Implementation of all the 7 TDD configurations
(including 2 TTI config 0 scheduling in the UL) and all 9 special subframe
configurations.
·
Implementation of DL HARQ multiplexing and bundling.
·
Implementation of TDD level changes in RACH.
·
Implementation of features like sub-band scheduling,
ICIC, DRX and SPS.
·
Interoperability testing with LTE UE & TM500.
Debugging the issues encountered.
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Performance optimization of the MAC layer to enable
120 active UE’s running at the same time.
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Grooming of team members in LTE technology and MAC
implementation.
ENodeB Framework: Aricent’s LTE eNodeB
stack
Jan-May10, Apr 11-Oct 11
Aricent Technologies
This is an in-house Aricent (product) LTE eNodeB stack
development project, a Layer2, Layer3 offering along with a thin RRM and
OAM.
·
Involved in the development of the features QOS and
Handover across the various layers.
·
RRM development for Cell Control, UE/ERAB Admission
and HO control.
·
Involved in (thin) OAM development mainly including
the startup initialization and Command Line control.
·
Debugging of issues spanning the eNodeB protocol stack
layers.
LTE Call Processing Middleware for a Japanese Customer
Mar 2008 – Jan 2010
Aricent Technologies
The Call Processing Middleware is the layer between
the eNodeB L3 and the lower Protocol Stack layers (TUP (PDCP, S1U), MAC
& PHY). The role of CP Middleware was to provide a “Cell control”/”UE
call control” and “HO control” interface to the L3 for managing the
Cell/UE/eRAB entities at lower layers of the eNodeB . CP Middleware
maintains the database related to the Cell, UE for the associated Call
Control Logic.
(C, Linux)
·
Responsible for the UE Call control and Handover
sub-systems.
·
Closed the requirements with the customer for the
associated software releases and produced the SRS for the same.
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Design of the UE call control state machine
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Involved in coding and SSI Test Plan reviews.
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Debugging and Enhancements.
Epsilon (GSM/GPRS BTS), System O&M for NOKIA SIEMENS
NETWORK Oct 2005- Feb 2008
Aricent Technologies
BTS O&M provides the following main
functionalities: - Object Management - Configuration Management - Fault
handling - Commissioning - Software Download – Synchronization.
Platform: QNX Neutrino
6.3.0 on Intel XScale BE with cross platform development on Solaris
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Development and support of several features like
IDD/4UD, DPTRX in System O&M.
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Design and implementation RF cable auto-detection.
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Design and development of the Fault management and
alarm Handler module
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Enhancements, bug-fixing and support to system
integration team.
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