doc.: IEEE 802.22-12-0088r0

Submission

October 2012

Sunghyun Hwang, ETRISlide 1

[Resource Allocation for IEEE 802.22b Systems]

IEEE P802.22 Wireless RANs Date: 2012-10-28

Authors:

Notice: This document has been prepared to assist IEEE 802.22. 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 grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22.

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Name Company Address Phone email Sung-Hyun Hwang ETRI Korea +82-42-860-1133 shwang@etri.re.kr

Gwang-Zeen Ko ETRI Korea +82-42-860-4862 gogogo@etri.re.kr Byung-Jang Jung ETRI Korea +82-42-860-6765 bjjeong@etri.re.kr Myung-Sun Song ETRI Korea +82-42-860-5046 mssong@etri.re.kr

Jae-Ick Choi ETRI Korea +82-42-860-6160 jichoi@etri.re.kr

doc.: IEEE 802.22-12-0088r0

Submission

Summary Classification Statement

• It is a partial proposal regarding the resource allocation for 802.22b systems.– Address the issues of resource allocation– Propose the resource allocation and backup channel management

on a group basis– Compare the MAP overhead according to network model– Mainly consider the Smart Metering Model and Real-time/near

real-time video Monitoring Model as described in the 802.22b Functional Requirements Document

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Submission

Technology Overview

• Very large number of devices, small burst transmissions– It is a burden of overhead to allocate the resources to each devices

individually. It is also inefficient to use random-access fully.– The solution is Group Resource Allocation (GRA)

• Allocate the resources to the Group and contend the resources within each Group

• Select the appropriate resource allocation method (i.e., contention scheme or reservation scheme) within Group considering the Group characteristics

• Manage the backup channel on a Group basis

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Submission

MAP Overhead as Percentage of Frame

• Individual RA vs. group RA• Assumptions

– Smart Metering Model (Upstream)• 1 BS, 25 H-CPEs, 2500 L-CPEs (100 L-CPEs per H-CPE)• Max. simultaneous communication L-CPEs: 2500 (H-CPEs: 25)

– Real-time/near real-time video Monitoring Model (Upstream)• 1 BS, 250 H-CPEs, 2500 L-CPEs (10 L-CPEs per H-CPE)• Max. simultaneous communication H-CPEs: 100

– Bits per US-MAP IE: 16– Total bits per frame: 24*1440=34,560

• Assuming 6 MHz BW, ¼ CP, and QPSK-1/2

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Slide 4 Sunghyun Hwang, ETRI

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MAP Overhead as Percentage of Frame

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Slide 5 Sunghyun Hwang, ETRI

4.7%

2150

1.2%

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Submission

How to make a group? (Hub-device vs. Nano-device)

• Hub-device is a controller of a group consisting of many Nano-devices

• Hub-device (only one): access to DB, network entry with BS, identify the Group ID(GID)

• Nano-device (multiple): Sync. to Hub-device and/or BS• Hub-device is mode II or mode I device, but Nano-device

is mode I device only• Nano-devices has same GID, but different Device ID(DID)• Grouping the Nano-devices which connect to the same

Hub-device

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Type of Group

• Fixed Group– Hub-device is fixed (e.g., on the building, house, tower)– Fixed group with fixed devices (e.g., village, wind turbines)– Fixed group with nomadic devices (e.g., live stocks)

• Mobile Group– Hub-device is mobile (e.g., on the vehicles)– Mobile group with mobile devices (e.g., vehicles, boats)– Mobile group with nomadic devices (e.g., rescue crew, firefighter)

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Submission

How to Manage the Backup Channel?

• All devices within group share the same backup channel information.– Control all devices with one message simultaneously

• Type of group is determined according to the mobility of Hub-device.

• Using the location information from the Hub-device, the BS can identify if the group could overlap with other group or not.

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Submission

How to Manage the Backup Channel?

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• Fixed vs. Fixed– In principle, allocate same backup channel to each group (e.g., farmhouse vs. wind

turbine)– But, if they could overlap, the allocated backup channel should be different to avoid

interference among groups (e.g., farmhouse vs. village).

• Fixed vs. Mobile or Mobile vs. Mobile– In principle, allocate different backup channel to each group (e.g., wind turbines vs.

vehicles)– But, if they could not overlap, the allocated backup channel could be same for frequency

reuse (village vs. vehicles)

• Periodic monitoring to check if groups could overlap each other

– The backup channel of each group should be updated according to the monitoring result

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Submission

Example of Backup Channel Management

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Fixed group 1(e.g., farmhouse)

BS

BS

Hub-device

Nano-device

Tower

Commandvehicle

Patrol

Rescue

Ambulance

Ambulance

Patrol

Rescue

Farmhouse

Livestock

Orchard

Silo

Farm

Farm

Mobile group 1(e.g., vehicles, ships)

Fixed group 3(e.g., Wind turbines)

Backup channel(BCH)=(#1)

BCH=(#2)

BCH=(#2)

BCH=(#3)

HouseBuilding

Fixed group 2(e.g., village)

BCH=(#3)

Wireless interface between hub-device and nano-device

Wireless interface between BS and hub-device

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Submission

Messages to Support CR-based GRA

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Parameter Size Note

Type of Group (TOG) orType of Hub-device (TOH) 1 bit Fixed group: 0

Mobile group: 1

Location of Group (LOG)Location of Hub-device (LOH) 6 bytes Latitude: 3 bytes

Longitude: 3 bytes

Device Identifier (DID) < 3 bytesDepending on the number of devices under

the control of a BS. Same as Station ID(SID) in 802.22-2011 DS/US MAP IE

Group Identifier (GID) < 2 bytes Depending on the number of groups under the control of a BS

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Submission

Conclusions

• Reduce the MAP overhead using group resource allocation

• As new group or new incumbent user appears, or mobile group moves into other group, we can avoid frequent channel switching– Reduce the signaling overhead– Prevent QoS degradation due to frequent channel switching

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