1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [EGTS Joint Proposal for IEEE e]
Date Submitted: [January 19, 2009]
Source: [Myung Lee, Seong-Soon Joo, Tae Rim Park, Betty Zhao, Ghulum Bhatti, Ning Gu, Jie Shen, Wei Hong, Qin Wang, Quan Wang, and Ping Wang]
Address []
Voice:[ ], FAX: [],
Re: [IEEE P e]
Abstract: [This document describes a joint proposal for IEEE e. While maintaining the backward compatibility to legacy IEEE b, the joint proposal meets all the MAC behaviors ratified by e TG. Currently, this joint proposal comprises contributions from CUNY, ETRI, Samsung, Huawei, MERL, Vinno, SIMIT, Arch Rock, USTB, Shenyang Inst. of Automation]
Purpose: [Discussion in e Task Group]
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

2. Samsung, Arch Rock, SIMIT, Vinno, USTB, SIA, Chongqing UPT
EGTS Subgroup Report
CUNY, ETRI, MERL, Huawei,
Samsung, Arch Rock, SIMIT, Vinno, USTB, SIA, Chongqing UPT

3. Outline
1. Application support levels 2. Anticipated changes to STD 3. Backward compatibility description

4. Application Support Levels

5. Application Support Level
EGTS joint proposal can fully support all application domains because EGTS joint proposal can handle all required MAC behaviors.

6. Handling Required MAC Behaviors (1)
ACK
Secure and Robust ACK, Group Ack
Channel diversity (hopping, agility)
Adaptive Slot and Channel Allocation with Adjacent Channel Interference, Adaptive channel diversity, Optional distributed channel hopping
Superframe (GTS, TDMA)
Flexible and Backward-compatible Enhanced GTS, Embedded CFP
Low Power (Low duty Cycle)
Sampled Listening, CAP reduction, Optional inactive period
Overhead reduction (Short MAC address)
Distributed time slot and channel allocation, Distributed beacon scheduling, Embedded CAP, Reduced MAC header
Mesh support (Path diversity)
Tree and Mesh Support by EGTS structure

7. Handling Required MAC Behaviors (2)
Time synchronization (Relative, Absolute)
Time synchronization with deferred beacon
Resource Scheduling
Distributed EGTS allocation, Multiple QoS support, Sampled listening
Portability (Fast Assoc/disassoc, Associationless)
CAP, Localized channel allocation & Association
Beacon scheduling
Distributed beacon scheduling with beacon collision detection
Scalability
Distributed Approaches for resource scheduling, beacon scheduling
EGTS Joint Proposal also provides:
Reliability: EGTS Information Request, Embedded CAP, Deferred beacon
Backward Compatibility to
Harmonious Coexistence with

8. Anticipated changes to 802.15.4-2006 STD

9. Summary of Anticipated changes
Modified / New MAC primitives
MCPS-DATA, MLME-GTS, MLME-EGTSinfo, MLME-START
New MAC PIB attributes
macMultisuperframeOrder, macConnecDev,
macEGTSABT (Allocation Bitmap Table),
macEGTSACT (Allocation Counter Table)
A new command frame
EGTS handshake
New fields in Beacon Payload
EGTS superframe descriptor, Beacon bitmap, TimeSync

10. EGTS-based Superframe Structure
A new MAC PIB attribute – macMultisuperframeOrder
We define MO (multi-superframe order) such that N = 2(MO – SO), where MO ≥ SO.
Multi-superframe Duration MD = aBaseSuperframeDuration*2MO symbols
A new sub-field in Beacon payload
EGTS superframe descriptor (variable)
Multi-superframeOrder (MO) (4bits)
GTS/EGTS flag (1bit) – 0: GTS, 1: EGTS
CAP_Reduction flag (1 bit) – 0: off, 1: on
CAP_Index (2 octets, only when the CAP_Reduction flag is on)
Embedded CAP/CFP flag (1 bit)
0: Embedded CAP (Default)
1: Embedded CFP
Number of Sub-slots (1 octet, only when Embedded CFP flag is on) 10

11. EGTS Scheduling (1) A new parameter in a MAC Primitive
MLME-GTS.request
(GTSCharacteristics, SecurityLevel, KeyIdMode, KeySource, KeyIndex, EGTSCharacteristics)
MLME-GTS.confirm
(GTSCharacteristics, status, EGTSCharacteristics)
MLME-GTS.indication
(DeviceAddress, GTSCharacteristics, SecurityLevel, KeyIdMode,
KeySource, KeyIndex, EGTSCharacteristics)
A new command frame : EGTS Handshake
Sub-fields: MHR fields, Commands frame identifier, EGTSCharacteristics

12. EGTS Scheduling (2) EGTSCharacteristics field format
EGTS Length (1 octet) : If this field is set to zero, the device operates the same way as the GTS in MAC.
EGTS Characteristics type (3 bit): Allocation, Reallocation (for channel diversity or duplicated allocation), Deallocation, Duplicated Allocation Notification, Suspend, Reduce, Restart
EGTS handshake type (2bit) : Request, Reply, Notify
Prioritized Channel Access (1 bit) : high priority, low priority
Destination Address (2 octets)
EGTS Slot Identifier (2 octets)
EGTS ABT Sub-block Length (4 bits)
EGTS ABT Sub-block Index (2 octets)
EGTS ABT Sub-block (variable)

13. ABT Sub-block Index
ABT sub-block …
Entire ABT (Allocation Bitmap Table) may be too big to be transmitted by Beacon or EGTS command frames
Example (MO = 7, SO = 3)
ABT size = 224 octets (representing 1792 slots)
0: Vacant, 1: Allocated.
Row: time slot, Column: channel
Solution:
Send a ABT sub-block (with the index indicating beginning of the sub-block and the length of the sub-block)
ABT sub-block unit = 14 octets
(7 timeslot X 16 channels)
Example: 28 bytes sub-block.
ABT Sub-block Length = 2 units
ABT Sub-block Unit 13

14. EGTS Expiration, Deallocation, Reallocation
New MAC PIB attributes
macEGTSABT (Allocation Bitmap Table)
Explained in the previous slide
macEGTSACT (Allocation Counter Table)
ACT contains beacon interval counter of the slots that are allocated to the device (both as SRC and DST)
entry = (allocated slot ID, direction, beacon interval counter)

15. Allocation, Reallocation, and Deallocation Message sequence chart initiated by a SRC device

16. Reallocation, and Deallocation Message sequence chart initiated by a DST device

17. Channel Diversity
Anticipated changes are already explained in the previous slides.
EGTS reallocation defined in the EGTSCharacteristics field of MLME-GTS primitive and EGTS handshake command frame.
Requested by higher layer for
Adaptive channel diversity
Periodic channel hopping

18. Beacon Scheduling A new sub-field in Beacon payload
Beacon bitmap field
SD index (2 octets) : the index of current SD
SD bitmap length (2 octets)
SD bitmap (variable)
A new parameter in MLME-START.request
Add SDStartTime (2 octets), Beacon Schedule Flag (1 bit)
Optional: Disable the beacon scheduling and follow the instruction (SDStartTime) from a higher layer if the value of ‘beacon schedule flag’ is zero.

19. Time Synchronization New subfields in beacon payload TimeSync field
Timestamp (3 octets)
the time of sync parent’s local time. Is used to synchronize synch parent node.
Deferred beacon flag (1 bit)
0: Disable deferred beacon , 1: Enable deferred beacon
Deferred time (1 octet)
length and indicates the number of aUnitBackoffPeriod

20. GTS Information Request
A new MAC primitive
MLME-EGTSinfo.request
(CoordAddrMode, CoordPANId, CoordAddress, SecurityLevel, KeyIdMode, KeySource, KeyIndex)
MLME-EGTSinfo.confirm
(EGTSCharacteristics, Timestamp, status)
A new MAC PIB attribute
macConnecDev
Indication of whether the device is a Connection Device. A value of TRUE indicates that the device is able to communicate in both beacon-enabled and nonbeacon-enabled mode.

21. Quality of Service A new parameter in a MAC primitive
MCPS-DATA.request
extend TxOptions
(b0) 0: no Ack, 1: Ack
(b1) 0: CAP transmission, 1: GTS transmission
(b2) 0: direct transmission, 1: indirect transmission
(b3) 0 : CAP/GTS ( ),
1 : CAP/EGTS (15.4e): e.g, version control
(b4) 0 : Low Priority, 1 : High Priority

22. Sub-clauses for Primitives
characteristic
MCPS-DATA.request
MCPS-DATA.request
modification
MLME-GTS.request
MLME-GET.request
MLME-GTS.confirm
MLME-GTS.confirm
MLME-GTS.Indication
MLME-GTS.indication
MLME-START.request
MLME-START.request
MLME-EGTSinfo.request
Add new sub-clause
new
MLME-EGTSinfo.confirm

23. Sub-clauses for Frames
type
EGTS Handshake
A new command
new
Beacon
Beacon frame format
modification
EGTS Info
beacon allocation notification
beacon conflict notification

24. Sub-clauses for PIBs PIB Sub-clause type macMultisuperframeOrder
7.4.2 MAC PIB attributes
new
macConnecDev
New
macEGTSABT
macEGTSACT
mac SDIndex
macSDBitmap
macSyncTime
macChannelHoppingSequence
macChannelOffset

25. Sub-clauses for Functional description
PIB
Sub-clause
type
EGTS-based Superframe Structure
Superframe structure
modification
EGTS Scheduling
7.5.7 GTS allocation and management
Beacon Scheduling
Starting and realigning a PAN
Time Synchronization
7.5.4 Synchronization

26. Backward Compatibility

27. Backward Compatibility
EGTS is backward compatible with
No changes on the existing frame formats
Only additions that are optional
New frame formats, primitives, and PIB attributes
New fields in the payload of Beacon

28. Coexistence Minimal changes to the superframe structure.
EGTS can support the new features while harmoniously coexisting with the legacy devices ( , 2003).