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Paging Systems

Paging Systems. Network Computing Lab. 홍 정 표 ( jphong@kw.ac.kr ) 2003. 6. 17. Paging. One-way, personal wireless alerting/messaging system Type of information delivered in a paging system Alert tone : tone pager, limited number of alert tones (4 tones)

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Paging Systems

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  1. Paging Systems Network Computing Lab. 홍 정 표 ( jphong@kw.ac.kr ) 2003. 6. 17

  2. Paging • One-way, personal wireless alerting/messaging system • Type of information delivered in a paging system • Alert tone : tone pager, limited number of alert tones (4 tones) • Voice message : voice pager, several minutes of voice message • Digit string : numeric pager, telephone number of caller (display the digit string) • Text string : alphanumeric pager, display several text strings

  3. Paging Network Architecture (1/3) • User terminal equipment (input device) • Telephone handset, computer with modem, etc.

  4. Paging Network Architecture (2/3) • Paging terminal • have database of customers (pager number, pager code, types of message ) • deliver the message to its base station controllers or forward the message to other paging terminals • convert voice message to text for alphanumeric pager • store the message in a mailbox for pager • Operation and maintenance center • accesses customer database of the paging terminal • to add new customer records • to delete terminated customer records • to collect billing information

  5. Receiver Decoder Control Logic Display Paging Network Architecture (3/3) • Base station controller • link the paging terminal to the base station by powering up the BS • Base station • be designed for two-way voice • broadcast the message to the pager over radio links • Pager • Control logic • duplicate message detection • Message locking and freeze • Multiple alerting modes

  6. User Access Interface (1/2) • Telocator alphanumeric input protocol (TAP) 1. To send the message, the input device dials the paging terminal’s number. 2. Line is connected, the caller and the paging terminal exchange messages. Msg8 = “ < STX > Pager_ID < CR > Text < CR > Cksum < EXT >” Msg6 = “< STX > Pager_ID < CR > Text < CR > Cksum < ETB >” Msg7 = “ < Message_Sequence >< CR >< ACK >< CR >” Msg3 = “< ESC >< SST >< PPPPPP >” Msg5 = “< CR > [ p < CR >” Msg11 = “ < Message_Sequence >< CR >< ESC >< EOT >< CR >” Msg9 = “ < Message_Sequence >< CR >< RS >< CR >” Msg4 = “< CR >< ACK >< CR >” Msg2 = “ID = < CR >< LF >” Msg10 = “ < EOT >< CR >” Msg1 = “< CR >” Caller Paging Terminal Msg4 = “< CR >< NAK >< CR >” When the transmission violates a system Msg7 = “ < Message_Sequence >< CR >< NAK >< CR >” Msg4 = “< CR >< ESC >< EOT >< CR >”

  7. User Access Interface (2/2) • Telcator Message Entry Protocol (TME) • is the data input protocol of Telocator Data Protocol (TDP) • extend the TAP one-way paging to two-way communication • provide new service features • priority paging • deferred paging • periodic paging • message forwarding • message deletion • Intersystem Interface • Telocator Network Paging Protocol (TNPP) : used to create networks of paging terminals from different manufacturers

  8. Air Interface • Post Office Code Standards Advisory Group (POCSAG) • single operator, single frequency • maximum of 2 million users • two separate tones and then a burst of data; 576 bit preamble then multiple 544 bit batches • European Radio Message System (ERMES) • 35 bit radio identity code • effective transmission rate of 3750 bps • Each hour is partitions into 60 cycles, each cycle partitioned into 5 subsequences, each subsequence is partitioned into 16 batches

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