EP0325839A2
Expired / Lapsed
EP
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Method and apparatus for transmitting data packets from a plurality of stations in a time division multiplexed communication system
Assignee: Seiko Epson Corp
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Filing: 1988-11-08
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Granted: —
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Expires: 2008-11-08
Abstract
Abstract Improved time-division multiplexed communication methods for a wide area paging system. One method appends check bits of a correction code to each data word and interleaves the words on transmission. A second method transmits multiple messages for one or more paging receivers in a single time slot. A third method increases the number of individual receivers that can be served by a single paging system. A fourth method increases the number of receivers that can be served by splitting the receivers in an area among several systems.
Inventors
- 👤 Garold B. Gaskill
- 👤 Daniel J. Park
- 👤 Norbert E. Dey
- 👤 William H. Peek
- 👤 Lawrence H. Ragan
- 👤 Jeffrey R. Owen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 04:31
CPC Classifications
H; H04; H04W; H04W84/00; H04W84/02; H04W84/022; G; G04; G04G; G04G21/00; G04G21/04; G04R; G04R20/00; G04R20/14; G04R20/20; G04R60/00; G04R60/04; H04W88/00; H04W88/18; H04W88/185; H04W88/187
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
153 words
In a time-division multiplexed communication method of transmitting digital signal data packets from a transmitter to a plurality of receivers, a method of improving reception of a data packet by the receivers, comprising: dividing the packet into data words of a bit length corresponding to a preselected error correction code; generating check bits of the correction code for each data word and appending the check bits to the data word to form a code word; interleaving the code words on transmission from the transmitter to the receivers; generating check bits of the correction code at the receivers for each data word received; and comparing the transmitted check bits for each data word against the check bits generated for the data word at the receiver to detect if an error has occurred in transmission of the data word and, if so, indicating the bit position of the error in the data word for correction.
Claim 2
Dependent Claim
153 words
In a time-division multiplexed communication method of transmitting digital signal data packets from a transmitter to a plurality of receivers, a method of improving reception of a data packet by the receivers, comprising: dividing the packet into data words of a bit length corresponding to a preselected error correction code; generating check bits of the correction code for each data word and appending the check bits to the data word to form a code word; interleaving the code words on transmission from the transmitter to the receivers; generating check bits of the correction code at the receivers for each data word received; and comparing the transmitted check bits for each data word against the check bits generated for the data word at the receiver to detect if an error has occurred in transmission of the data word and, if so, indicating the bit position of the error in the data word for correction.
Claim 3
Dependent Claim
58 words
The method of claim 1 in which the interleaving of code words comprises: transmitting as a sequence the bits at one position in each code word and continuing with sequences from the other bit positions until all the bit positions are transmitted; and reassembling at the receiver the transmitted bits into their original positions in their code words.
Claim 4
Dependent Claim
37 words
The method of claim 1 in which the comparing of the check bits includes exclusive ORing corresponding check bits to generate a number whose value indicates the bit position of a transmission error in the data word.
Claim 5
Dependent Claim
178 words
In a time division multiplexed communication method of transmitting periodic frames of a first duration subdivided into subframes having time slots of a second duration, the subframes and time slots having unique identification numbers, and assigning receivers an address that includes a unique number as one portion of the address and a subframe and time slot identification number as another portion, and encoding data into digital data packets bearing a time slot identification number, each packet of substantially equal duration to a time slot, a method of transmitting multiple messages for one or more receivers in a single time slot, comprising: encoding format information within the data packet which alerts receivers assigned the time slot number as a portion of their address that more than one message is contained in the packet; placing the messages in predetermined positions within the packet to be recognized by the alerted receivers as multiple messages; and encoding within each message an address that corresponds to the unique numbered portion of the receiver address so that only the intended receiver reads the message.
Claim 6
Dependent Claim
178 words
In a time division multiplexed communication method of transmitting periodic frames of a first duration subdivided into subframes having time slots of a second duration, the subframes and time slots having unique identification numbers, and assigning receivers an address that includes a unique number as one portion of the address and a subframe and time slot identification number as another portion, and encoding data into digital data packets bearing a time slot identification number, each packet of substantially equal duration to a time slot, a method of transmitting multiple messages for one or more receivers in a single time slot, comprising: encoding format information within the data packet which alerts receivers assigned the time slot number as a portion of their address that more than one message is contained in the packet; placing the messages in predetermined positions within the packet to be recognized by the alerted receivers as multiple messages; and encoding within each message an address that corresponds to the unique numbered portion of the receiver address so that only the intended receiver reads the message.
Claim 7
Dependent Claim
43 words
The method of claim 4 in which the message itself contains format information indicating to the addressed receiver that the information therein is an actual data message or is a pointer to a target time slot where the data message can be found.
Claim 8
Dependent Claim
20 words
The method of claim 5 in which the actual data messages are transmitted as binary numbers corresponding to predetermined messages.
Claim 9
Dependent Claim
141 words
In a time division multiplexed communication system having a transmitter system comprising a plurality of stations transmitting on different frequencies digital data packets to a plurality of receivers each having an address, a method of increasing the number of individual receivers that can be served by a single system, comprising: encoding format information in a data packet uniquely addressed to a receiver within the system indicating that the data therein is receiver control information rather than message information; encoding in the receiver control information the identification of stations within the system to which the addressed receiver must tune for message information; transmitting the data packet from all stations within the system to alert the addressed receiver to tune to any of the identified stations; and transmitting the data packets having message information to the addressed receiver only from the identified stations.
Claim 10
Dependent Claim
141 words
In a time division multiplexed communication system having a transmitter system comprising a plurality of stations transmitting on different frequencies digital data packets to a plurality of receivers each having an address, a method of increasing the number of individual receivers that can be served by a single system, comprising: encoding format information in a data packet uniquely addressed to a receiver within the system indicating that the data therein is receiver control information rather than message information; encoding in the receiver control information the identification of stations within the system to which the addressed receiver must tune for message information; transmitting the data packet from all stations within the system to alert the addressed receiver to tune to any of the identified stations; and transmitting the data packets having message information to the addressed receiver only from the identified stations.
Claim 11
Dependent Claim
37 words
The method of claim 7 in which encoding the identification of stations comprises identifying each station by a time offset that corresponds to the station's frequency in a list of frequencies and offsets known to the receiver.
Claim 12
Dependent Claim
140 words
In a time division multiplexed communication system having a plurality of transmitter systems each comprising a plurality of stations for transmitting on different frequencies digital data packets including system control packets to a plurality of receivers each having an address, a method of splitting the receivers in an area among several systems to increase the number of receivers that can be served, comprising: encoding in a control packet a mask bit field corresponding to a predetermined portion of a receiver's address; encoding in a control packet an address field corresponding to the same portion of the receiver address; and masking bits in the mask bit field to indicate the bits in the address field that must be matched by the corresponding portion of the receiver address for the receiver to be served by the system transmitting to the control packet.
Claim 13
Dependent Claim
140 words
In a time division multiplexed communication system having a plurality of transmitter systems each comprising a plurality of stations for transmitting on different frequencies digital data packets including system control packets to a plurality of receivers each having an address, a method of splitting the receivers in an area among several systems to increase the number of receivers that can be served, comprising: encoding in a control packet a mask bit field corresponding to a predetermined portion of a receiver's address; encoding in a control packet an address field corresponding to the same portion of the receiver address; and masking bits in the mask bit field to indicate the bits in the address field that must be matched by the corresponding portion of the receiver address for the receiver to be served by the system transmitting to the control packet.
Claim 14
Dependent Claim
147 words
In a time division multiplexed communication system having a transmitter system comprising a plurality of stations for transmitting on different frequencies data packets including system control packets and message packets to a plurality of receivers each having an address, a method of improving the probability of reception of the message packet by the receiver, comprising: offsetting the time of transmission of data packets from each station within the system so that the same data packets are transmitted at different relative times; encoding within a control packet the frequency and time offset of the currently tuned station relative to a predetermined zero offset station; and encoding within a control packet a list of other station frequencies and the time offset for each other station, each receiver determining from the control packets the frequency and time offset of the station that will next transmit a message to the receiver.
Claim 15
Dependent Claim
147 words
In a time division multiplexed communication system having a transmitter system comprising a plurality of stations for transmitting on different frequencies data packets including system control packets and message packets to a plurality of receivers each having an address, a method of improving the probability of reception of the message packet by the receiver, comprising: offsetting the time of transmission of data packets from each station within the system so that the same data packets are transmitted at different relative times; encoding within a control packet the frequency and time offset of the currently tuned station relative to a predetermined zero offset station; and encoding within a control packet a list of other station frequencies and the time offset for each other station, each receiver determining from the control packets the frequency and time offset of the station that will next transmit a message to the receiver.
References Cited (Backward Citations)
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