1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Relayed Slot-Link Network
Date Submitted: 16 January, 2012
Source: Seong-Soon Joo, Kwang-Soo Kim, Jong-Arm Jun, Cheol-Sig Pyo
Company: ETRI
Address: 161 Gajeong-dong, Yuseong-gu, Daejeon, KOREA
Voice: , FAX: ,
Re:
Abstract: As an initial draft for the LECIM MAC, to extend the networking coverage of a star network, the Relayed Slot-Link Network (RSLN) is considered.
Purpose: Initial draft for the LECIM MAC
Notice: This document has been prepared to assist the IEEE P 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 P
<author>, <company>

2. Relayed Slot-Link Network
<month year>
doc.: IEEE <doc#>
Relayed Slot-Link Network
Seong-Soon Joo*,
Kwang-Soo Kim, Jong-Arm Jun, Cheol-Sig Pyo
ETRI
<author>, <company>

3. LECIM MAC Design Design considerations low bit rate PHY
25Kbps
long distance
asymmetric topology
1-n star topology over 1,000 devices
unbalanced power-source
need to extend the coverage
short data, less frequent
long life span without maintenance
20 years
various quality of service
delay sensitive, delay tolerant

4. Possible Infra Structures
Star topology
power free collector
synchronized/asynchronous resource allocation
power management on end point
identify operators at PHY or MAC layer
Multi-hop topology with repeater
virtual star network
synchronized resource allocation for each hop
upward/downward forwarding at the MAC layer
operator 1
operator n

5. Link Repeater Extend reaches of link Link repeater
varying RF environment from/to coordinator
devices are located sparsely
extend reaches of link from/to coordinator
Link repeater
echo forward a frame after receiving a frame from the coordinator or devices
link repeater is power-free or located at ease maintainable place
coordinator
repeater
device

6. Synchronous Link Relaying (I)
maintain star-topology virtually by relaying the frames outward or inward
extend the transmission coverage
synchronous relaying
synchronous relaying at link layer
repeaters associate to PAN coordinator
tiered structure
repeat cyclic-superframe
device choose repeater
nearest to the coordinator
near node
far node
layer 1
layer 2
layer 3
coordinator
repeater
device

7. Slot-Link Access modify the DSME slot-link
explicit link from coordinator & from device  separate CAP
bidirectional slot  slot for downward link
remove GTS allocation & maintaining  convert an address to a slot
delay sensitive upward channel
slot-link
beacon slot
prioritized device slot
coordinator slot
bidirectional device slot
primary device slot
multiple supplementary device slot
coordinator slot
(cmd/OAM data, ALOHA)
supplementary-down-link
(cmd/OAM data, CSMA-CA)
primary-down-link
(cmd/OAM data, CSMA-CA)
supplementary-down-link
(cmd/OAM data, CSMA-CA)
prioritized device slot
(pr 0 data, ALOHA)
supplementary-up-link
(cmd/data, CSMA-CA)
primary-up-link
(cmd/data, ALOHA)
supplementary-up-link
(cmd/data, CSMA-CA) up dn
Slk up dn
Plk up dn
Slk up dn 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

8. Relayed Slot-Link Network (I)B C a b 2 1
layer 1
layer 2
layer 3 3
Relayed Slot-Link Network (I)
network formation
repeater associates to the PAN coordinator
coordinator A
layer 1
repeater A B
repeater B a
layer 2
repeater a b
repeater b
layer 3
device 1
inner
beacon
peer beacon
outer
cyclic-superframe beacon

9. Relayed Slot-Link Network (II)
downward synchronous link relaying
beacon relaying
broadcasting on coordinator slot
MLME related commands service channel on bidirectional device slot
coordinator
layer 1
repeater A A A
layer 2
repeater a A a A a
layer 3
device 1 a a

10. Relayed Slot-Link Network (III)
upward synchronous link relaying
prioritized device slot
bidirectional device slot
coordinator
layer 1
repeater A A A
layer 2
repeater a A a A a
layer 3
device 1 a a

11. Relayed Slot-Link Network (IV)
Relayed Slot-Link Extension
link network
maximum depth of hierarchical link extension : aMaxLinkExtensionDepth
RSLN coordinator
beacon : RSLN descriptor IE
RSLN repeater
device

12. RSLN descriptor IE Beacon
slotted-superframe specification : (2 octets)
BO, SO, number of prioritized device slot (2bit: 0~3), number of coordinator slot (2bit: 0~3), channel hopping mode
time synchronization specification : (6 octets)
beacon specification: (superframe index: 2 + bitmap length:2 + bitmap var1 ~ 64 (SO=5, BO=14)
pending slot specification : ~7 (num of pending slot:1 + slot list var: 8)
Bits: 0-3
4-7
8-9
10-11 12 13 14 15
Ocetes:6
4-15
Octets:2
Var
Octets: 1~64
Octets:1
var
Beacon
Order
Superframe
Prioritized device slot number
Coordinator slot number
BLE
reserved
PAN coord
Association permit
Time stamp
LSLN ID
Slotted-supframe Index
Bitmap length
Beacon bitmap
Number of pending slot
Pending slot list
slotted-superframe specification
Time sync spec
Beacon specification
Pending slot specification

13. RSLN Coordinator MLME-RSLN-START.request MLME-RSLN-START.confirm
The MLME-RSLN-START.request primitive is used by the RSLN coordinator to initiate a new RSLN or to begin using a new slotted-superframe configuration.
This primitive is also used by a RSLN repeater already associated with an existing RSLN to begin using a new slotted-superframe configuration.
The semantics of this primitive are:
PANId, ChannelNumber, ChannelPage, BeaconOrder, SuperframeOrder,
DeviceSlotNum, CoordinatorSlotNum, PANCoordinator,
CoordRealignment, CoordRealignSecurityLevel, CoordRealignKeyIdMode, CoordRealignKeySource, CoordRealignKeyIndex,
BeaconSecurityLevel, BeaconKeyIdMode, BeaconKeySource, BeaconKeyIndex
MLME-RSLN-START.confirm
The MLME-RSLN-START.confirm primitive reports the results of the attempt to start using a new superframe configuration.
MLME-RSLN-START.confirm (
status )

14. RSLN Repeater MLME-RSLN-ASSOCIATE.request
MLME-RSLN-ASSOCIATE.indication
MLME-RSLN-ASSOCIATE.response
MLME-RSLN-ASSOCIATE.confirm

15. Thanks for your Attention! ssjoo@etri.re.kr