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United States Patent [19] [11] Patent Number: 4,713,808 Gaskill Et Al

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United States Patent [19] [11] Patent Number: 4,713,808 Gaskill Et Al United States Patent [19] [11] Patent Number: 4,713,808 Gaskill et al. [45] Date of Patent: Dec. 15, 1987 [54] WATCH PAGER SYSTEM AND 4,569,598 2/1986 Jacobs ........ .. 368/47 COMMUNICATION PROTOCOL 4,641,304 2/1987 Raychaudhun .................... .. 370/93 [75] Inventors: Garold B. Gaskill, Portland; Daniel J. Primary Examiner-Donate W- Olms Pal-k; Robert G_ Ruuman, both of Assistant Examiner-Melvm Marcelo Beaverton; Donald T. Rose, Portland; Attorney, 1489f!’ 0' FirmfKlal'quisti Sparkmatli Joseph F. Stiley, III; Lewis w. , Campbell, Lelgh & Whmsron Barnum, both of Tigard, all of Greg; [57] ABSTRACT Don G. Hoff, Tiburon, Calif. _ . _ _ _ _ _ ' ‘ _ A wide area pagmg system 1s dlsclosed 1n wh1ch pagmg [73] Asslgnee: A 8‘ E Corporation’ San Franclsco’ messages input to the system in one local area can be Cahf' broadcast to a receiver in any other local area without [21] APPL No_; 302,344 necessarily broadcasting the message in all areas. A . local area clearinghouse in each area stores resident [22] F?ed' Nov‘ 27’ 1985 subscriber data including current location and receiver [51] Int. Cl.‘ .......................... .. H04J 3/24; H04] 3/26 serial number. This data is used to transfer messages [52] US. Cl. ................................ .. 370/94; 370/93 over a data network to the correct clearinghouse. The [58] Field of Search ........................... .. 370/94, 60, 93; system uses a TDM data protocol. The data is encoded 340/825-52 and transmitted at a very high rate (e.g., 19,000 band) in [561 References Cited short packets (256 bits/l3 milliseconds) via stereo FM sidebands. Receivers are assigned to receive sequen U'S' PATENT DOCUMENTS tially numbered time slots matching a portion of their 3,532,985 10/1970 Glomb et a1. ..................... .. 375/115 address. The addresses of intended receivers are in 3,628,147 12/1971 Makimo . .. 325/4 cluded in the data packets. Battery-powered receivers gills fatal-1 are deactivated between packets and reactivated in v 9 a 011 E - .. , . _ 4,131,855 12/1978 Harnagawa ..... .. 328/129 acwrdance with m? seqllemlal “me 51°‘ number 4 315 332 2/1982 Sakami et al 455/181 scheme to receive an incoming packet. Messages longer 413171220 2/1982 Martin ................. .. 455/53 than a Packet are Segmented and transmitted in two 0r 4,337,463 6/1982 Vangen ....... .. 340/8253 more packets, linked together by data contained in the 4,358,836 11/1982 Tohyama et al. ...... .. 368/47 packets. A watch pager used in the system employs a 4,369,443 V1933 Gtallanza et a1- - 340/32547 wristband antenna which electromagnetically couples 3:332:21‘ a1- ' to the user’s body. The watch pager displays time, tele 4:419:765 ‘12/1983 Wycoff et al ............... .. 455/36 ph°ne.numbers and icons representing c°mm°n types 4,437,095 3/1984 Akaho’ri et al. 340/825.44 °f Pagmg messages 4,518,961 5/1985 Davis et al. 340/825 44 4,519,068 5/1985 Krebs et al. ......................... .. 370/82 20 Claims, 30 Drawing Figures 602 SUB-FRAME 3 (l4 SEC.) )1 x / \ / / \ CO Cl C2 0 I 2 "° "‘ IO22|O23 0 I (I I - SUB-FRAME l5 (14 SEC.) — co c1 c2 0 1 2 501 "‘ 1022 I023 \ I\ I / \ CONTROL SLOTS TIME SLOTS Y 3 \r 604 606 604 US, Patent Dec. 15,1987 Sheet 1 of 17 4,713,808 88 909294 96 9a '00 F l G IA - / ' OEQk’K‘QB I/|02 78° [HHS-‘E1890’ F | G.|B 22 / ‘2s a \ 2o CLEARINGHOU CLEARINGHO - \ COMPUTER COMPUTER a AP 1,34 36\~ AP a 44 S S 62 64 p - T T \ / [in N N [m m 46 [I L" NETWORM} L I] H ['9 P ‘K 7 P B» 1» 42 54 /\56 3a 5a/[ 60 4o2 1 US. Patent Dec. 15,1987 Sheet 2 0f 17 4,713,808 F | G. 2A CLEARINGI-IOusEGLOBAL \-I2G GA GLOBAL DATACOMM. NETwOR Q B I22 \ CONTINENTAL CONTINENTAL CONTINENTAL CLEARINGHOUSE CLEARINGHOUSE CLEARINGHOUSE ‘ CONTINENTAL . DATACOMM. '20 - Q C NETwORK H80 “8 \ I \ NATIONAL NATIONAL NATIONAL <30 CLEARINGHOUSE CLEARINGHOUSE CLEARINGI-IOusE NATIONAL "4 24d "6\ SUBSCRIPTION a NATIONAL NATIONAL SERVICE CENTER DATACOMM, TELECOMM‘ SUBSCRIBERS @QE H00 “Ob \ I a H REGIONAL REGIONAL REGIONAL <3 F CLEARINGI-IOuSE CLEARINGHOUSE CLEARINGHOUSE 39 24c 38 REGIONAL REGIONAL DATACOMM. TELECOMM. SUBSCR'BERS <1 6 NETWORK NETWORK 36 I \ \ LOCAL LOCAL LOCAL <1 H CLEARINGI-IOuSE CLEARINGI-IOUSE CLEARINGHOUSE 32 24 LOCAL LOCAL SUBSCRIBERS 62 DATACOMM. TELECOMM. REQUESTORS NETWORK OI ; vOICE MAIL \24b 45L RECEIVER f I ‘ 20d \,\ TRANSMITTER TRANSINITTER m TRANSMITTER LINK '- K 5 QJ LINK \ w BROADCAST - 44° {IA/4% NETWORK 44 44a 44b REPEATER TRANSMITTER TRANSMITTER TRANSMITTE\R\ OK 20'\--RECEIvER ZOQLRECEIVER ZObT-RECEIVER RECEIVER \ SUBSCRIBER 240 20c US. Patent Dec. 15, 1987 Sheet 6 of 17 4,713,808 _1||||TillllilI , US” Patent Dec. 15,1987 Sheet 7 of 17 ' 4,713,808 600 FRAME (7.5 MIN.) . o | 2 3 I5 293031 602\/ V / \ \ \ \’ 602 F I6. 58 602 SUB-FRAME 3 (14 am) A .k // \ / \ co c1 c2 0 | 2 ~-- ' "' I022 |o23 L SUB-FRAME l5 (l4 SEC.) 4 co CI 02 o | 2 so: "' I022 I023 \-—_._V_JM—-—-W____J CONTROL SLOTS TIME SLOTS 1/ / ) \ \r 606 604 6 0 4 F I 6. 5C 604 TIME SLOT 50! (I3 MSEC/256 BITS) 6l2 FIRST PACKET SECOND ADDRESS FIELD ASSEMBLY FIELD ADDRESS FIELD 6'6 6|4 6|8 6'4 r A \ r \ A if A \ 605 K 608 6'0 FRAME SOQEOQEOM, \ TRANSPORT CHECK FLAG SLOT/LS8 ADDR MSG #,CONT. NUMBER MSB ADDR DATA SEQUENCE FLAG PAD B'Ts a Is |,|,1, 5, 8, I6 112 l6 8 4 TOTAL a ma ECC |s+a Ecc |s+s ECC l6 s 4 BITS H2 :60 ~—-—-—-200+ 4O BIT ZERO INSERTION 240 256 260 US. Patent Dec. 15, 1987 Sheet 8 of 17 4,713,808 2 PROCESS AND REASSEMBLE PACKETS 3 CALCULATE AND PROGRAM DELAY f MSG#, LENGTH, ADDRESS "20 [REASSEMBLE CHAINS TO MESSAGESj L28 CHAINS \ PR ($538533) < 2b ] REASSEMBLE PACKETS INTO A CHAIN ISSL'JSZDEOC' SOC LEVEL PACKETS FOR ME MY ADDRESS,, SLoT, MY SLOT, 20 [MY ADDRESS, GROUP D FILTER IF S.0.C. MY SUBFRAME \ N DATA, LSB ADDRESS r Id LECC IF BAD FCS I (| READ) lc FCS CALCULATE AND COMPARE LINK < N.S.I. LEvEL . lb zERo BIT DELETE \ IO FIND FLAGS l PEESIEEJLAL { a RECEIVER TuRN oN/oFF US. Patent Dec. 15,1987 Sheet 10 0f 17 4,713,808 F I 8 8/02 806 OF 0 808 ER 20- 804 / / ?/A I FC I I | 0 l5 I9 23 3a 53 76 I00 FM BASEBAND (kHz) l9 KhZ STEREO PILOT I !/ l 9% m m MA76 KM SUBCARRIER 990 F I G SIGNAL STRENGTH RECEIVER NOISE FLOOR DATA PACKETS US. Patent Dec. 15,1987 Sheet 11 of 17 4,713,808 850 ANTENNA I sTANDARD SPECIFICATION Y Y | BOUNDARY CELLULAR RECEIVER/TUNER f“ 840 l FM SUB-CARRIER REcEIvER/ I TUNER AND DEMODULATOR I sTREAM CONTROL CLOCK 0F LINK OF RECEIVER l LEvEL PowER AND | PACKETS‘ FREQUENCY 750 V ,1 s AND 0 s | / ADDITIONAL 7001 8 BIT MICRO COMPUTER GROUP/ PERIPHERAL DEvIcE ADDRESSES 4B|T MICRO COMPUTER WITH I DISPLAY AND CONTROL BUTTONS <--—-—-—— coNTRoL OF PROTOCOL DECODER ggaoEoRER I T'MER’ REASSEMBLY OF PACKETS, | INTERPRETATION OF MESSAGES NETwoRI< PACKETSLEvEL DATA ‘ TIMESUBFRAME sLDT PoRTIoN OF FRAME 0 | LINKED 2 3 L|N§<ED |& A O socjGi?M §6',E'E,“0—M s0c,Eoc,EoM CONT.#=3 co '[#= I5 coNT.=I=I=3 MSG =II==I 4' MSG =H==| MSG sos \ J I soc,Eoc,ECONT =2__ M MSG 1=F= sos 2 soc,'E"E,"_MCONT.#=2 LIN,KED _CONT.#so_'c‘.EDc,EoM =I__ s . MSG#=2 MSG #:2, sos I3 socfE?gEoMCONT.# = 3 ?cEoQEoMCONT.#=_O__ MSG=FI==3 Mse #=3,sos I LINKED 0 soc,Eoc,EoM CONT.=#==O MSG#=4,SOS US, Patent Dec. 15,1987 Sheet 13 of 17 4,713,808 D SECOND lF _Iour FH RH FILTER AMPLIFIER _" 6m we8 , - I 8 m R\: \ a RvlnXOL 6 868 870 I 48 FLUSM ECUAInOE DMHLT NR a L L a 6 6 0 S ~I+IQIIL __ _| FIGHB' R' W M R 3c fR F 8 F0M mmA ULllsw mmm D. WUU.\.8RM P. 7T U MRn “A anKK Wu EONI V ‘Fm V /\mMm, 8 8 M mIL m D N TRANSMITTED STEREO PILOT AND AUDIO MONITOR Fl G. |3D ' 93s ‘DATA I n/ FROM QUEUER ° 1? I l CYCLE OF l9 KHZ REFERENCE SIGNAL l CYCLE OF l9 KHZ STEREO PILOT US» Patent Dec. 15,1987 Sheet 14 of 17 4,713,808 FIG. |2A US. Patent Dec. 15, 1987 Sheet 15 of 17 4,713,808 m5 N5Sm 052w;E US, Patent Dec. 15, 1987 Sheet 16 of 17 4,713,808 ‘r.PDO{on mwm ~18.ice54.0cow i OM70?‘ wmm . Patent Dec. 15,1987 Sheet 17 0117 4,713,808 whm m+ S xOm XUOJO mm:02 10/ Ohm mCmOmEOU 4,713,808 1 2 slot in which data for the particular page receiver is WATCH PAGER SYSTEM AND transmitted. The drawbacks of this approach, however, COMMUNICATION PROTOCOL have been several. First, it is dif?cult to synchronize accurately the page receiver to the transmitter. Second, RELATED APPLICATION DATA long messages that cannot be transmitted in a single The application is related to US. patent application time slot require an inordinate amount of time to be Ser. No. 06/678,603, ?led Dec. 5, 1984, by Don G. completely transmitted to a page receiver.
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