[PPT] - Aaron Schulman Stanford University Cellular base station PHY PowerPoint Presentation

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Aaron Schulman

Stanford University

Smartphone power measurement

Cellular base station PHY measurement

SLIDE 2

Aaron Schulman

Stanford University

Smartphone power measurement

Cellular base station PHY measurement

SLIDE 3

Can we observe high delay spread and adjust to compensate? To identify and adapt to challenging PHY environments: How often are frames dropped due to inter-cell interference?

To quantify the pervasiveness of PHY faults:

Why measure the PHY 

f cellular base stations?

SLIDE 4

Can we observe high delay spread and adjust to compensate? To identify and adapt to challenging PHY environments: How often are frames dropped due to inter-cell interference?

To quantify the pervasiveness of PHY faults:

Why measure the PHY 

f cellular base stations?

To inform the design and deployment of future standards

SLIDE 5

An Opportunity! Programmable DSPs

Example: TI 6678

8 DSP cores @ 1GHz
4 ARM cores @ 1GHz
Many co-processors

ANSI C

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Re#TX& HARQ& Resource& Mapping& MCS& Combining& MIMO$

Cellular requirements make it

challenging to add new measurements

3 ms latency 20 MHz bandwidth High reliability

LTE UL PHY (eNB)

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Re#TX& HARQ& Resource& Mapping& MCS& Combining& MIMO$

Cellular requirements make it

challenging to add new measurements

3 ms latency 20 MHz bandwidth

~2,000 cycles per byte

25 cycles per sample Can not exceed cycle budget

Low DSP clock rates make it

High reliability

LTE UL PHY (eNB)

SLIDE 8

Atom

Composable processing block that   requires fixed processing resources BPSK48  Atom 48 cplx 48 bits

= ¡200 ¡cycles

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Atom

Composable processing block that   requires fixed processing resources Entire base station PHY can be made of Atoms We built a 54 Mbps 802.11a receiver entirely out of Atoms BPSK48  Atom 48 cplx 48 bits

= ¡200 ¡cycles

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Atom

Composable processing block that   requires fixed processing resources Entire base station PHY can be made of Atoms New measurements are just new Atoms We built a 54 Mbps 802.11a receiver entirely out of Atoms We added a delay spread measurement Atom BPSK48  Atom 48 cplx 48 bits

= ¡200 ¡cycles

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Atom

Composable processing block that   requires fixed processing resources Entire base station PHY can be made of Atoms New measurements are just new Atoms We built a 54 Mbps 802.11a receiver entirely out of Atoms We added a delay spread measurement Atom

New measurements can be deployed on Atom-based base stations

BPSK48  Atom 48 cplx 48 bits

= ¡200 ¡cycles

SLIDE 12

Smartphone power measurement

Cellular base station PHY measurement

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Smartphone power measurement

Cellular base station PHY measurement

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Did a code change harm energy consumption?

Why measure smartphone power?

Do users use apps in a way that wastes energy? Are apps using hardware inefficiently?

To create models of energy consumption:

To inform developers about app energy consumption:

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Did a code change harm energy consumption?

Why measure smartphone power?

Do users use apps in a way that wastes energy? Are apps using hardware inefficiently?

To create models of energy consumption:

To inform developers about app energy consumption:

To find new ways to improve smartphone battery life

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Properties of an ideal  smartphone power monitor

Passive Scalable Mobile Universal

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Properties of an ideal  smartphone power monitor

Passive Scalable Mobile Universal

No existing power monitor has all 5 properties

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Passive Scalable Mobile Universal