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BATTERY-SAVING FOR DATA BROADCASTING WITH NOVEL MESSAGE STRUCTURES/SCHEDULE FILTERING

IP.com Disclosure Number: IPCOM000007564D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2002-Apr-05
Document File: 3 page(s) / 189K

Publishing Venue

Motorola

Related People

Jyh-Han Lin: AUTHOR [+2]

Abstract

Periodic data broadcasting (news, stock quotes, weather, etc.) over paging and other radio channels is gaining popularity as a key wireless data applica- tion. Assessing broadcast data does not require uplink transmission and is "listen only? This is in contrast to the scenario where the client (portable) requests a piece of data on the uplink channel and the data server responds by sending this piece of data to the client.

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MO7VROLA Technical Developments

BATTERY-SAVING FOR DATA BROADCASTING WITH NOVEL MESSAGE STRUCTURES/SCHEDULE FILTERING

by Jyh-Han Lin and Leon Jasinski

1. INTRODUCTION

  Periodic data broadcasting (news, stock quotes, weather, etc.) over paging and other radio channels is gaining popularity as a key wireless data applica- tion. Assessing broadcast data does not require uplink transmission and is "listen only? This is in contrast to the scenario where the client (portable) requests a piece of data on the uplink channel and the data server responds by sending this piece of data to the client.

  Power conservation is a key issue for small wire- less data receivers and other small portable units. For wireless data broadcasting applications power conservation is even more important since the receiver is supposed to receive a large amount of data, as contrasted to relatively short messages in messaging applications.

  The battery-saving schemes inherent in paging protocols such as Motorola FLEX Paging Protocol provide power saving hooks where the portable can trade off latency for battery life. However, for data broadcasting applications, there exist other battery- saving opportunities which can potentially yield enor- mous battery savings. For example, the wireless

receiver can stay in the sleep mode as long as the topics in the broadcast is of no interest to the user; and then only to wake up in time to receive the data that concerns the user.

  This paper outlines a battery-saving scheme for wireless data receivers with novel message struc- tures and schedule filtering.

2. BATTERY SAVING SCHEME

The battery-saving scheme makes use of three mechanisms that cooperate to conserve battery life:

1. A wireless data broadcasting server, which man- ages many data sources and broadcasts a sched- ule periodically (for example, daily, or every 2 hours). (The schedule can even be published daily in newspapers!) The schedule lists the subjects to be broadcast, the approximate time the subject to be broadcast, keywords related to the subject, length of broadcast for the subject, summary, chan- nel number, etc. Figure 1 is an example format for schedules. In each schedule broadcast, the time for the next schedule broadcast can also be announced; this scheme has the advantage of being more dynamic and flexible.

APPROXIMATE

TM SUBJECT KEY WORDS

LENGTH (MINUTES) CHANNEL

J/2/9:00 HEADLINES MOTOROLA, 4 l/2 1

JAPAN, CELLULAR 3/2/9:05 MONEY INFLATION, I 112 1

INTEREST RATES 3/z/9:10 SPORTS WINTER I l/2 1

OLYYPICS 3/z/9:15 WEATHER HURRICANE, 4 I/2 1

                 FLORIDA 3/Z/9:20 STOCK A-C 3 1 312/9:23 STOCK D-E 3 1

. . . . . . . . . . . . . . .

NEXT SCHEDULE BROADCAST TIYE: 3/Z/11:00

Fig. 1 An example ofa wireless data broadcasting schedule. The schedule is updated and broadcast periodically,

0 Motorola. Inc. ,995 99 November 1995

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MozylRoLA Technical Developments

2. A schedule filter (or power-on schedule...