Doc.: IEEE 802.15-01/135r1 Submission March 2001 Ed Callaway, MotorolaSlide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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Presentation transcript:

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [MAC proposal for the Low Rate Standard] Date Submitted: [10 March, 2001] Source: [Ed Callaway] Company: [Motorola] Address: [8000 W. Sunrise Blvd., M/S 2141, Plantation, FL 33322] Voice:[(954) ], FAX: [(954) ], Re: [WPAN Call for Proposals] Abstract:[This presentation represents Motorola’s proposal for the P MAC standard, emphasizing the need for a low cost system having excellent battery life.] Purpose:[Response to WPAN Call for Proposals] 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

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 2 MAC Proposal for the Low Rate Standard Ed Callaway, Member of the Technical Staff Motorola Labs Phone: Fax:

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide is Different! Assumptions M2M is a major market that needs to be addressed. Requirements differ from those of other WPANs –More emphasis on longer battery life and lower cost. –Less emphasis on message latency, channel capacity, and QoS. –Support for larger space and device numbers. –Location determination. Since the requirements are different, the design should be, too!

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 4 Cluster/Mesh Network Suitable for a large number of devices (Scalable) CH2 CH3 CH5 CH4 CH6 Cluster ID = 2 Cluster ID = 4 Cluster ID = 3 Cluster ID = 5 Cluster ID = A All devices are physically identical, except the “Designated Device” Gateway

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 5 Network Formation A “Designated Device” (Gateway) initiates network formation by designating Cluster Head 0 (which may be separate from the DD). Network grows via inquiry/inquiry scan technique, similar to Each device is assigned a network address composed of the Designated Device ID, Cluster ID, and Device ID (total of 24 bits). Designated Device assigns Cluster IDs; cluster heads assign device IDs.

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 6 Routing Each node maintains a “neighbor list” of devices it can hear (designating its parent), plus a list of children. Nodes overhear network maintenance messages to identify children and the route to them. First step in routing algorithm is to check the neighbor list; if destination is on the list, message is sent directly (“wormhole routing”). Otherwise, message is sent to the parent; process is repeated until a node is reached that has the destination as a child (or on its neighbor list).

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 7 Network Frame To lower power consumption, node duty cycle is reduced to 0.1%. However, for an asynchronous system, two nodes are unlikely to be simultaneously active. Further, to achieve the low cost goal, inexpensive time base elements (preferably ceramic resonators or, ideally, MEMS devices) are desired, which have relatively poor frequency stability. 1 ms 1 s TxTx RxRx 1 ms 1 s TxTx

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 8 Aloha Statistics – With short (1 ms) transmissions, collisions are unlikely. – A liability (poor reference stability) is turned into an asset (randomized transmission timing).

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 9 Dedicated Mediation Devices To enable nodes to synchronize, Mediation Devices (MDs), which can record and replay messages, are dispersed throughout the network. Dedicated MDs receive for a period of time (e.g., 2 s), transmit as needed, sleep, then repeat the process MDs, like telephone answering machines, are simple: They must record and replay simple control words such as who is transmitting, who is desired, timing information, and perhaps short messages. Receive Tx (sleep) 2 s N s

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 10 Aloha, M.D. Periodically each idle device in the network transmits an “Any traffic for me?” message. The MD receives these messages, noting the time each was sent, and sends appropriate replies when the receiver of each node is active.

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 11 A B MD 1.Node A sends an “I have traffic for node B” message, but B is sleeping. The MD intercepts node A’s message, including timing information. 2.When node B checks in with the MD, it finds out that A has a message, and when A will try to contact again. 3.Node B now knows A’s schedule, so they can now sync on the same time slot and start communication. MD Node A Node B MD Listen 1 s

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 12 Distributed Mediation Devices As a variation of the dedicated mediation device, the functionality of the MD can be distributed among all nodes in the network. Each node becomes an MD at a random time, then returns to normal operation. The frequency with which a node performs the MD function depends on several factors, including: –Desired battery life –Latency requirements –Number of nodes in the network

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 13 MAC Size Software implementation of: –Rx packet recovery, addressing, system timing –Tx packet construction, addressing, system timing –Mediation Device function Requires: –32 kB ROM –4 kB RAM –30 k gates CPU core (overkill) 1.8 mm 2 in 0.18 um standard CMOS

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 14 Vision IEEE Standards have an obligation to support industry direction and emerging market opportunities. Location determination and remote sensing of inventory alone is a $25 billion market, growing at 15 to 20% per year … industrial control and monitoring is larger still. These markets cannot be met with existing star networks, due to cost and power concerns. In this case, we must produce a standard that supports: –applications requiring ultra-low cost & low energy nodes. –applications that require large node numbers and scalability. –node location determination. An innovative solution is needed, and we believe that the Aloha MD approach is that solution.

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 15 Criteria 1

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 16 Criteria 2

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 17 Criteria 3

doc.: IEEE /135r1 Submission March 2001 Ed Callaway, MotorolaSlide 18 Criteria 4