Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [EGTS Joint Proposal for IEEE 802.15.4e] 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:[+1-212-650-7260], FAX: [], E-Mail:[lee@ccny.cuny.edu] Re: [IEEE P802.15.4e] Abstract: [This document describes a joint proposal for IEEE 802.15.4e. While maintaining the backward compatibility to legacy IEEE 802.15.4b, the joint proposal meets all the MAC behaviors ratified by 802.15.4e 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 802.15.4e Task 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.

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

Outline 1. Application support levels 2. Anticipated changes to 15.4-2006 STD 3. Backward compatibility description

Application Support Levels

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

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

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 802.15.4 -2006 Harmonious Coexistence with 802.15.4 -2006

Anticipated changes to 802.15.4-2006 STD

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

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

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

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 15.4-2006 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)

ABT Sub-block Index ABT sub-block … 00000000 00000000 00001000 00000100 00000000 01000000 00001000 00000000 01000100 00000100 10000000 01000000 01000100 01000100 10000000 00000000 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

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)

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

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

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

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.

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

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.

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 (15.4-2006), 1 : CAP/EGTS (15.4e): e.g, version control (b4) 0 : Low Priority, 1 : High Priority

Sub-clauses for Primitives characteristic MCPS-DATA.request 7.1.1.1 MCPS-DATA.request modification MLME-GTS.request 7.1.6.1 MLME-GET.request MLME-GTS.confirm 7.1.7.2 MLME-GTS.confirm MLME-GTS.Indication 7.1.7.3 MLME-GTS.indication MLME-START.request 7.1.14.1 MLME-START.request MLME-EGTSinfo.request Add new sub-clause new MLME-EGTSinfo.confirm

Sub-clauses for Frames type EGTS Handshake A new command new Beacon 7.2.2.1 Beacon frame format modification EGTS Info beacon allocation notification beacon conflict notification

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

Sub-clauses for Functional description PIB Sub-clause type EGTS-based Superframe Structure 7.5.1.1 Superframe structure modification EGTS Scheduling 7.5.7 GTS allocation and management Beacon Scheduling 7.5.2.3 Starting and realigning a PAN Time Synchronization 7.5.4 Synchronization

Backward Compatibility

Backward Compatibility EGTS is backward compatible with 802.15.4-2006. 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

Coexistence Minimal changes to the superframe structure. EGTS can support the new features while harmoniously coexisting with the legacy devices (802.15.4-2006, 2003).