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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Samsungs Pre-proposal for 802.15.4J] Date Submitted: [5 July 2011]

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Submission Title: [Samsungs Pre-proposal for 802.15.4J]

Date Submitted: [5 July 2011]

Source: [Seung-Hoon Park, Jae-Seung Son, Kiran Bynam, Ranjeet.K.Patro, Taehan Bae, Thenmozhi Arunan, Dr.Euntae Won], Company [Samsung Electronics]

Address [Bagmane Tech Park, CV Raman nagar, Bangalore]

Voice:[+91 9986154930], FAX: [+91 80 41819000], E-Mail:[[email protected]]

Re: [Call for Proposals, March 2011]

[If this is a response to a Call for Contributions, cite the name and date of the Call for Contributions to which this document responds, as well as the relevant item number in the Call for Contributions.]

[Note: Contributions that are not responsive to this section of the template, and contributions which do

not address the topic under which they are submitted, may be refused or consigned to the “General Contributions” area.]

Abstract: [This document describes the Samsungs Pre-Proposal to 802.15.4j]

Purpose: [For consideration by TG 4j group]

Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.

Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.

<Seung-Hoon Park>, <Samsung Electronics>


MAC Proposal for IEEE 802.15.4J Area Networks (WPANs)

  • Seung-Hoon Park, Kiran Bynam, Ranjeet K Patro, Thenmozhi Arunan, Dr.Euntae Won

<Seung-Hoon Park>, <Samsung Electronics>


Outline
Outline Area Networks (WPANs)

  • Technical Requirements

  • MAC Requirements

  • Proposed ideas

    • Easy Pairing

    • Mutual Broadcast Period

    • Unslotted & Slotted CSMA-CA at Nonbeacon-enabled PAN

    • Beacon Exchange

    • Congestion Avoidance

    • Coordinator Switching

  • Summary

<Seung-Hoon Park>, <Samsung Electronics>


Technical requirements and scope
Technical Requirements and scope Area Networks (WPANs)

  • PHY and MAC amendment for 802.15.4 for support of medical devices in MBAN spectrum

    • Secondary usage of MBAN spectrum

    • Reusability of 802.15.4 protocol and PHY to enable the shifting of spectrum to 2.4 GHz ISM band in case of congestion in MBAN spectrum

    • Spectrum usage limited to data transmission intended for diagnosis, treatment of patients

<Seung-Hoon Park>, <Samsung Electronics>


Mac requirements
MAC Requirements Area Networks (WPANs)

  • Low power consumption

    • Low duty cycling

  • QoS for medical data

    • Enhanced channel access scheme

    • Robust mesh networking

  • Mobility

    • Seamless monitoring

  • Support for easy pairing

    • Intuitive/autonomous device discovery

    • simple association procedure

<Seung-Hoon Park>, <Samsung Electronics>


Easy pairing
Easy Pairing Area Networks (WPANs)

  • Usage scenario

    • A medical expert wants to connect sensors to a patient, but monitoring device is far from the patient

Medical Expert

Far from a patient

Patient

Monitoring Device

<Seung-Hoon Park>, <Samsung Electronics>


Easy pairing1
Easy Pairing Area Networks (WPANs)

  • Usage scenario

    • So the medical expert uses portable device to get patient record and connect sensors by touch-based communication (e.g. NFC) to the healthcare system of the patient

Medical Expert

Far from a patient

Patient

Monitoring Device

<Seung-Hoon Park>, <Samsung Electronics>


Easy pairing2
Easy Pairing Area Networks (WPANs)

  • Required functions

    • Portable device intermediates pairing procedure between coordinator and sensor devices

    • Coordinator grants association authority to the portable device with required information

    • Coordinator allows association request for sensors from the portable device

<Seung-Hoon Park>, <Samsung Electronics>


Mutual broadcast period mbp
Mutual Broadcast Period (MBP) Area Networks (WPANs)

  • Objectives

    • Enhanced channel access scheme

    • To inform queue length among devices

    • Load balancing to avoid much back-offs

  • Required functions

    • Additional period using CSMA-CA for mutual broadcasting among devices

B

MBP

CAP

Inactive

B

Active

<Seung-Hoon Park>, <Samsung Electronics>


Mutual broadcast period mbp1
Mutual Broadcast Period (MBP) Area Networks (WPANs)

MBZ

1

MBZ

2

MBZ

3

MBZ

4

MBZ

5

MBZ

6

CAZ 1

CAZ 2

CAZ 3

CAZ 4

CAZ 5

CAZ 6

B

MBP

CAP

Coordinator

Q

Q

Q

E-CAP

N-CAP

X

X

Device 1

Q

N-CAP

E-CAP

N-CAP

Device 2

Q

Q

N-CAP

E-CAP

X

Device 3

Q

Q

Q

B-CAP

X

X

X

Device 4

Q

Q

N-CAP

E-CAP

E-CAP

N-CAP

Device 5

*Q: QoS information broadcast (queue length, etc)

*E-CAP (Exclusive CAP), N-CAP (Normal CAP), B-CAP (Background CAP)

<Seung-Hoon Park>, <Samsung Electronics>


Mutual broadcast period mbp2
Mutual Broadcast Period (MBP) Area Networks (WPANs)

  • Operation

    • Device broadcasts short QoS information (using CSMA-CA with shorter back-off slot length) during MBZ(Mutual Broadcast Zone) which is selected to notify the intention of access to corresponding CAZ(Contention Access Zone)

    • Device can select one or multiple of MBZs/CAZs according to traffic demand

MBZ 1

MBZ 2

Mini backoff slot

<Seung-Hoon Park>, <Samsung Electronics>


Mutual broadcast period mbp3
Mutual Broadcast Period (MBP) Area Networks (WPANs)

  • 3 different types of CAPs

    • Exclusive CAP

      • for device which broadcasts successfully at MBZ

    • Normal CAP

      • for device which just listens during corresponding MBZ

      • same as original CAP

    • Background CAP

      • for device which failed at all trials over MBP

    • Greedy level of CSMA-CA transmission

      • Exclusive CAP > Normal CAP > background CAP

<Seung-Hoon Park>, <Samsung Electronics>


Unslotted slotted csma ca at nonbeacon enabled pan
Unslotted & Slotted CSMA-CA Area Networks (WPANs)at Nonbeacon-enabled PAN

  • Motivation

    • Nonbeacon mode is useful for low power consumption and simplicity

    • However, Nonbeacon mode has low performance due to asynchrony within devices

  • Solution

    • Synchronized channel access mechanism at Nonbeacon-enabled PAN

<Seung-Hoon Park>, <Samsung Electronics>


Unslotted slotted csma ca at nonbeacon enabled pan1
Unslotted & Slotted CSMA-CA Area Networks (WPANs)at Nonbeacon-enabled PAN

  • Approach for synchronization

    • Not MAC-level synchronization

      • No timestamp

      • No packet exchange within devices a little error from delay

    • PHY-level synchronization

      • Using known symbols (e.g. sync symbols)

      • Low power consumption & fast convergence

      • E.g. Pulse-Coupled Oscillator synchronization

[Reference] R. E. Mirollo and S. H. Strogatz, “Synchronization of pulse-coupled biological oscillators,” Journal on Applied Mathematics, vol. 50, pp. 1645–1662, Dec. 1990.

<Seung-Hoon Park>, <Samsung Electronics>


Unslotted slotted csma ca at nonbeacon enabled pan2
Unslotted & Slotted CSMA-CA Area Networks (WPANs)at Nonbeacon-enabled PAN

Fire

  • * Pulse-Coupled Oscillator (PCO)

Fire

Fire

B

A

  • PCO In-phase Synchronization

    • (a) Each oscillator has its own phase and firing frequency with same period T.

    • (b) Oscillator B receives positive stimulus and promote firing frequency, oscillator E receives negative stimulus and repress the firing frequency.

    • (c) After iterations, the phase between each oscillator becomes equal and in-phase synchronization is realized.

D

E

B

C

A

A

B

E

E

C

D

C

C

D

<PCO In-phase Synchronization>

<Seung-Hoon Park>, <Samsung Electronics>


Unslotted slotted csma ca at nonbeacon enabled pan3
Unslotted & Slotted CSMA-CA Area Networks (WPANs)at Nonbeacon-enabled PAN

Fire

Fire

Fire

B

A

A

  • PCO Anti-phase Synchronization

    • (a) Each oscillator has its own phase and firing frequency with same period T.

    • (b) Oscillator B receives positive stimulus and promote firing frequency, oscillator E receives negative stimulus and repress the firing frequency.

    • (c) After iterations, the phase offset between each oscillator becomes equal and anti-phase synchronization is realized.

B

A

E

B

E

E

C

C

C

C

D

D

D

<PCO Anti-phase Synchronization>

<Seung-Hoon Park>, <Samsung Electronics>


Unslotted slotted csma ca at nonbeacon enabled pan4
Unslotted & Slotted CSMA-CA Area Networks (WPANs)at Nonbeacon-enabled PAN

  • Unslotted CSMA-CA

    • Using PCO anti-phase synchronization

A’s CAP

B’s CAP

A

Anti-sync word

E

B

E’s CAP

D

C’s CAP

C

D’s CAP

<Seung-Hoon Park>, <Samsung Electronics>


Unslotted slotted csma ca at nonbeacon enabled pan5
Unslotted & Slotted CSMA-CA Area Networks (WPANs)at Nonbeacon-enabled PAN

  • Unslotted CSMA-CA

    • Each device calculates its own CAP duration based on neighbor devices’ firing time

    • For example, device A detects the timing of its next firing during the previous period

    • Device A decides its own CAP from A’s firing to next firing (E’s firing)

    • E’s firing may be changed but only backwards

    • So A’s CSMA-CA transmission will not affect E’s operation

<Seung-Hoon Park>, <Samsung Electronics>


Unslotted slotted csma ca at nonbeacon enabled pan6
Unslotted & Slotted CSMA-CA Area Networks (WPANs)at Nonbeacon-enabled PAN

  • Slotted CSMA-CA

    • Using both PCO in-phase & anti-phase synchronization

A’s CAP

B’s CAP

A

Anti-sync Word

E

B

E’s CAP

Sync Word

A

B

E

C

D

D

C’s CAP

C

D’s CAP

<Seung-Hoon Park>, <Samsung Electronics>


Unslotted slotted csma ca at nonbeacon enabled pan7
Unslotted & Slotted CSMA-CA Area Networks (WPANs)at Nonbeacon-enabled PAN

  • Slotted CSMA-CA

    • Each device calculates its own CAP duration based on neighbor devices’ firing time of Anti-sync Word (The method is same as unslotted CSMA-CA case)

    • Each device refer the firing time of Sync-word of its own, as the back-off slot boundary

      • All Sync-word and related oscillators’ phase are going into same phase, and finally converged

<Seung-Hoon Park>, <Samsung Electronics>


Beacon exchange
Beacon Exchange Area Networks (WPANs)

  • For beacon exchange, symmetric link between nodes should be guaranteed. So beacon relaying method is required if there is asymmetric link.

Relay

notice

Relay

request & response

C

X

B

A

O

<Seung-Hoon Park>, <Samsung Electronics>


Congestion avoidance at relay node
Congestion Avoidance at Relay Node Area Networks (WPANs)

  • Problem

    • a relay node receives data from a plurality of sensor nodes at the same time, congestion arises due to the bottleneck of buffer overflow

  • Solution

    • a relay node broadcasts a response signal comprising congestion-related information with respect to data transmitted to the relay node from a certain sensor node, and then adjacent sensor nodes learn the state of the certain sensor node by referring to the congestion-related information comprised in the response signal

<Seung-Hoon Park>, <Samsung Electronics>


Coordinator switching
Coordinator Switching Area Networks (WPANs)

  • Motivation

    • The method which can promptly replace the present coordinator with another device if an unexpected situation happens so that the present coordinator cannot suddenly broadcast a sync signal

  • Operation

    • 1) selecting a coordinator that broadcasts a sync signal for synchronizing network

    • 2) selecting devices and setting a priority of the selected replacement coordinators

    • 3) transmitting the priority to the selected replacement coordinator

    • 4) if the sync signal is not broadcast for a predetermined time, the replacement coodrinator becomes a new coordinator in accordance with the set priority

<Seung-Hoon Park>, <Samsung Electronics>


Service based discovery
Service based Discovery Area Networks (WPANs)

  • Motivation

    • There may be many different types of coordinators

    • Sensor may consume much power to scan and connect all coordinators, and find the proper one according to service type

  • Solution

    • Service ID in Beacon frame

<Seung-Hoon Park>, <Samsung Electronics>


Summary
Summary Area Networks (WPANs)

  • Low power consumption

    • Low duty cycling

  • QoS for medical data

    • Enhanced channel access scheme

    • Robust mesh networking

  • Mobility

    • Seamless monitoring

  • Support for easy pairing

    • Intuitive/autonomous device discovery

    • simple association procedure

  • Mutual Broadcast Period

  • Unslotted & Slotted CSMA-CA for Nonbeacon-enabled PAN

  • Beacon Exchange

  • Congestion Avoidance

  • Coordinator Switching

  • Proxy Association procedure

  • Service based Discovery

<Seung-Hoon Park>, <Samsung Electronics>


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