ieee p802.11 wireless access method and physical layer...

January 1991 I Doc: IEEE P802.11/91-08

IEEE P802.11 Wireless Access Method and Physical Layer

DATE: January 7, 1991

TITLE: Wireless In-Bulldlng Network Mmet Considerations

AUTHOR: Mn Ovan Senior Marketing Manager Motorola. Inc. R~dio Telephone Systems Group 3209 N. Wilke Rd. Arlington Heights. IL 60004 Phone: 708-632-3102 FAX: 708-632-6816

SUMMARY

In the past year, there have been a plethora of announcements regarding new wireless initiatives. To the casual observer, programs such as WIN (Wireless In- . building Network), CT-2 (Cordless Telephone .. 2). OECT (Digital European Cordless Telephone). and PCN (Personal Communications Network) represent an "alphabet's soup" of technology acronyms. Because these programs are wireless, there is a tendency to view these programs as direct competitors. However, a deeper look at the applications would Indicate that some of these systems may In fact be complementary solutions that offer targeted price/performance levels to different economic classes of customer.

The applications of wireless to In-building communications are many and varied. One single solution will not optimize all applications; In fact, such a proposed solution will penalize each attempted served application through lower performance and higher cost. and will fail against focused. function .. specific product alternatives.

The wireless systems finding success will be those that most precisely meet the application requirements of a chosen customer segment Each wireless application has trade-oH considerations In performance, capacity. cost, supported equipment types, domain of coverage, protection from interference, and ease of implementation. In any standards effort. it is crucial to first property define the served application so that the appropriate trade .. oHs can be assessed and agreed-upon. This contribution attempts to shed some light on the various market considerations relative to wireless in-building networks.

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"USERS MA Y NOT KNOW IT, BUT ONE OF THE SINGLE BIGGEST EXPENSES IN THEIR

COMMUNICA TIONS BUDGET IS WIRING--MOSTL Y LABOR TO KEEP THINGS WORKING RIGHT"

Jerry McDowell McDowell Romero & Assoc.

"Worth Noting" Column Network World

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IN-BUILDING COMMUNICATIONS PROBLEMS

• THE WIRING LINK BETWEEN THE DESK AND ASSOCIATED VOICE AND DATA NETWORKS ONE OF THE BIGGEST PROBLEMS FACED BY NETWORK MANAGERS

• SIGNIFICANT INHIBITOR TO MORE EFFECTIVE PERSONNEL DEPLOYMENT IN ORGANIZATIONS

• INSTALLATION AND CONTINUOUS RE-WIRING FOR MOVES/ADDS/CHANGES VERY COSTLY

• PRODUCTIVITY LOSSES DUE TO COMMUNICATIONS "DOWN-TIME"

• PROBLEMS BECOME EVEN MORE ACUTE WITH FURTHER PENETRATION OF PCs IN THE OFFICE

• BOTTOM LINE: GREATER DEGREE OF FLEXIBILITY AND EXPENSE REDUCTION IN THE USE AND MOVEMENT OF EaUIPMENT IN THE WORKPLACE IS CRUCIAL

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MARKET NEEDS OVERVIEW

• MOVES AND CHANGES

--WIRE OFTEN HAS TO BE RE-RUN

--CHANGE ORDERS TAKE UP TO 8 WEEKS

--DOWNTIME FOR CHANGES = PRODUCTIVITY LOSSES

--DATA TERMINALS MOVED FREQUENTLY

--COST PER CHANGE = $200 TO $3000

--WIRING INVESTMENT LEFT BEHIND--MUST SPEND AGAIN

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MARKET NEEDS OVERVIEW

• ••• BUT WILL NOT SACRIFICE TO ENJOY WIRELESS FLEXIBILITY BENEFITS

--SPEED PERFORMANCE EQUAL TO/BETTER THAN WIRE

--NO LOG-ON ·REQUIREMENTS, CHANGES TO HARDWARE/SOFTWARE

--COMPATIBILITY WITH EXISTING WIRED NETWORKS AND COMPUTER/COMMUNICATIONS DEVICES

--RELIABLE, SECURE, COST EFFECTIVE

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• WIDE RANGE OF NEED

-·INCREASING DEPARTMENTAL RECONFIGURATIONS

--DRAMATIC GROWTH IN PCs/HIGH SPEED LANs

--LITTLE INTEREST IN ON·PREMISE PORTABILITY

--LITTLE INTEREST IN ALLOWING OFF-PREMISE USE

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WIRELESS CONNECTIVITY ISSUES

• THERE IS A TENDENCY TO LOOK AT VOICE COMMUNICATIONS AS UNIFORM, AS WELL AS DATA COMMUNICATIONS

--"THEY ARE BOTH DIGITIZED DATA SO THERE1S NO PROBLEM SUPPORTING THEM"

. • DIVERSITY OF CONNECTION TYPES, TRAFFIC REQUIREMENTS FOR VOICE,

DATA, AND VOICE/DATA

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IBM PC AND COMPATIBLES ~ . - PS/2

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-- MACINTOSH

• TERMINAL TYPES

-- ASYNCHRONOUS "DUMB" TERMINALS - - IBM "3270" TERMINALS

• HOST COMPUTERS "1:1 . ~

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• LOCAL AREA NETWORKS '""

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TELEPHONE DEVICE DEMOGRAPHICS/IMPLICATIONS

IMPLICATION:

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PROPORTION OF TELEPHONES BY TYPE

500 OR MORE 200-499 UNDER 200 NUMBER OF PHONES

1YPE a= PHONE

• 2500SETS II 1 A2 KEYSETS II OTHER KEY SETS ~ PROPRIETARY SET

SOURCE: Motorola Market Study

ALTHOUGH A CUSTOMER MAY HAVE 60°A, SINGLE LINE PHONES AT HIS SITE, THESE PHONES ARE OFTEN MIXED-IN WITH MULTI-LINE AND PROPRIETARY PHONES.

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DESKTOP EQUIPMENT U.S.-1990

• IBM SYNCHRONOUS TERMINALS

OVER 10 MILLION INStALLED

• ASYNCHRONOUS tERMINALS OVER 7 MILLION INSTALLED

~ PERSONAL COMPUTERS AND LOCAL AREA NETWORKS

OVER 30 MILLION INSTALLED

• TELEPHONE SETS OVER 38 MILLION INSTALLED

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MICROCELL ARCHITECTURES

Optimized For More Defined and Focused Coverage Areas

Department Floor Entire Building City Block

A Number of Micr(o-Cell Alternatives Will Be Available, Based On:

Coverage Area Requirement Voice/Data Densities and Usage Frequency Availability

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EVOLUTION OF WIRELESS COMMUNICATIONS

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CHALLENGE OF COMBINED CAPABILITIES

CHARACTERISTIC WIDE AREA IN-BUILDING

CONTROL OF RF NONE SOME (> w/ hi freq.)

POWER HIGH LOW

"TALK" TIME LOW HIGH

LOCATING USER MORE DIFFICULT LESS DIFFICULT

USER DENSITY/CAPACITY LOW HIGH (> w/ hi freq. & coord.)

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LICENSED VS UNLICENSED ISSUES

• SEVERAL "MISCONCEPTIONS" ABOUT LICENSED SERVICE

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MISCONCE-PTION 1: "There will be a fee to the 'Private Carrier"'.

--PART 94 OF FCC RULES SPECIFICALLY CREATED SO SYSTEMS COULD BE OPERATED PRIVATELY.

--PART 94 RULES DO NOT PERMIT CHARG;lNG FOR AIRTIME

MISCONCEPTION 2: "Licensing Is a bu:'den to the customer."

--LICENSING IS A BURDEN FOR THE CUSTOMER ONLY IF THE MANUFACTURER DOES NOT MAKE THE INVESTMENT NOR COMMITMENT TO MAKING IT PAINLESS FOR THE CUSTOMER.

LICENSED SERVICE BENEFITS

--FREQUENCIES ARE MANAGED SUCH THAT FREQUENCIES CAN BE RE-USED OVER AND OVER, ENABLING VERY HIGH CAPACITY

--FREQUENCIES ARE MANAGED SUCH THAT INTERFERENCE IS MINIMIZED-UNLICENSED AFFORDS NO SUCH PROTECTION TO THE CUSTOMER

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CONCLUSIONS FOR STANDARDS EFFORTS

• NO "SINGLE" DATA SOLUTION

• DIFFERENCES IN APPLICATIONS IMPACT WIRELESS TECHNOLOGY AND PRODUCT CHARACTERISTICS

• SPECIFIC DEFINITION OF SERVED APPLICATION FOR STANDARD IS KEY

• TRADE-OFF CONSIDERATIONS OF CHOSEN APPLICATION MUST BE ASSESSED

--LOW SPEED VS HIGH SPEED DATA --CAPACITY/DENSITY OF SUBSCRIBERS --DOMAIN OF COVERAGE: WORK GROUP/FLOOR/BUILDING/METRO AREA, ETC. --COMPATIBILITY WITH EXISTING WIRED NETWORKS --EASE OF IMPLEMENTATION -·PROTECTION FROM INTERFERENCE

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ieee p802.11 wireless access method and physical layer...

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