1. Submission Title: Improving Packet Energy Efficiency Using ULP Mode
May 2014
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Improving Packet Energy Efficiency Using ULP Mode
Date Submitted: May 2014
Source: SS SShahriar Emami, Samsung
75 W Plumeria Drive, San Jose, CA, USA
Abstract: Technique for Improving Packet Energy Efficiency
Purpose: Overview of a proposed approach
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Shahriar Emami, Samsung

2. Improving Packet Energy Efficiency Using ULP Mode
May 2014
Improving Packet Energy Efficiency Using ULP Mode
Shahriar Emami, Samsung

3. May 2014
Proposal
For both PHY options, the packet energy efficiency for short packets is quite poor.
A simple procedure to improve the energy efficiency of both options is proposed.
It requires definition of a ULP signaling bit in the PHY header.
In this mode previous parameters are used. Unused bandwidth is used to send more data.
For both PHY options, the packet energy efficiency for short packets is quite poor.
A simple procedure to improve the energy efficiency of both options is proposed.
It requires definition of a ULP bit in the PHY header.
In ULP mode previous parameters are used. Unused bandwidth is used to send more data.
Shahriar Emami, Samsung

4. Asymmetric links proposed by ULP-GFSK
May 2014
Asymmetric links proposed by ULP-GFSK
Shahriar Emami, Samsung

5. Packet Energy Efficiency
May 2014
Packet Energy Efficiency
Shahriar Emami, Samsung

6. Samsung-IMEC Frame Structure
May 2014
Samsung-IMEC Frame Structure
Shahriar Emami, Samsung

7. May 2014
PHY Header
ULP
To improve efficiency, PHY header can be used for data transmission as well.
Use one bit of PHY header as ULP signaling indicator (either PHR7 or PHR11 can be used).
In ULP state (ULP = 1), previous frame header parameters will be used. With the exception of PH7 (or PHR11) all other bits are used to carry data
In non- ULP state (ULP = 0), a new frame header will be used
Shahriar Emami, Samsung

8. Energy Efficiency for Short Packets (VSF-TOOK)
May 2014
Energy Efficiency for Short Packets (VSF-TOOK)
The energy efficiency for short packets
(5 bytes long) is quite poor (10.6%).
Using this approach packet efficiency increases by 40%.
Equivalent to increasing battery life by 40%.
Shahriar Emami, Samsung

9. May 2014
ULP-GFSK PHY Header
ULP
The DW field is ignored in the ULP-GFSK proposal. One can use it to signal the ULP mode.
When (ULP = 1), previous frame header will be used. Frame length field carries data.
In non-ULP state (ULP = 0), a new frame header will be used. .
Shahriar Emami, Samsung

10. Energy Efficiency for Short Packets (ULP-GFSK)
May 2014
Energy Efficiency for Short Packets (ULP-GFSK)
The energy efficiency for short packets
(5 bytes long) is quite poor (45%)
Packet efficiency can be increased using this method by about 18%.
Equivalent to increasing battery life by 18%.
Shahriar Emami, Samsung

11. May 2014
Conclusion
A simple technique to improve the packet energy efficiency was presented.
The technique is suitable for asymmetric links.
Applicable to both VSF-TOOK and ULP-GFSK.
Utilizes degrees of freedom in both options.
Shahriar Emami, Samsung