Method and receiver for receiving messages sent by radio

• US 4,759,022 A
• Filed: 06/30/1986
• Issued: 07/19/1988
• Est. Priority Date: 11/26/1984
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Akerberg, Dag E.
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): Beausoliel, Robert W.
• Application Number:
  US06/887,093
• Time in Patent Office: 750 Days
• Field of Search: 371/69, 371/22, 371/31, 371/32, 371/53, 371/57, 371/67, 455/32, 455/38, 340/825.44
• US Class Current: 714/704
• CPC Class Codes: G08B 3/1016 using wireless transmission calling systems using transmission by inductive loop H04B5/00
• CPC Class Codes: G08B 5/227 with call or message storage means
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04W 88/023 with message or information receiving capability

Abstract

In a method of receiving messages transmitted by radio in the form of coded characters, there is included storing a message in blocks together with error indications pertaining to the same, storing the same repeated messages in a register, and then combining a final version of the message from the blocks associated with the stored messages and containing the least number of errors. For guidance in the combination of blocks from different messages, there is an identity code inserted in each message. There are further included inserting, and searching for, characters in the messages pertaining to repetititon of the messages, the number of blocks in the messages and joining several messages into a continuous message. A receiver for carrying out the method contains a receiver aerial, a radio section, a demodulator, a decoder for the receiver'"'"'s address, and a signal processor, which in turn contains a register for a message, a message memory for one or more messages, an error detector, the indications from which are also stored in the register, and a combination logic for combining a final version of the message from associated blocks containing the least number of errors.

Claims

1. In a method of receiving messges sent by radio transmission in the form of coded characters, combined into a plurality of blocks together with control characters associated with each block, in which method there are included the procedural steps of:

receiving the radio transmission and detecting the characters, storing the messages and showing the messages in a display window, the improvement comprising storing the characters in blocks, investigating whether a block contains an incorrectly received character, and, if so, storing in a message memory an error indication together with the associated block, further receiving at least one repetition of each message and storing the same in a register, combining a final version of the message from the blocks associated with the stored messages, which blocks contain the least numbers of errors and storing the final version of the message for presentation in the display window, said improvement further cimprising simultaneously storing a plurality of messages in said message memory and identifying a repeated message as a repeated message by sensing an identity code transmitted in the repeated message, and combining the final version of the message from the stored messages which have like identity codes.

2. A method as claimed in claim 1 comprising

selectively combining the blocks of a message with the blocks of a preceding message based on condition that the latest received message contains a character indicating that the latest received message is a repetition of the preceding message.

3. A method as claimed in claim 1 comprising

terminating the reception of a message only after the reception of a number of blocks indicated in the message.

4. A method as claimed in claim comprising

including in a message, which is to be connected to another message a character indicating that the message should be connected to another message to form a continuous message.

5. A receiver for receiving messages sent by radio transmission in the form of coded characters comprising a receiver aerial (1), a radio means (2) adpated for reception of radio signals and including a demodulator for processing received characters, decoder means (3) connected to the radio means and adapted for detecting the receiver'"'"'s address in the received characters, a signal processor means (4) connected to the decoder means (3) and including a message memory (45) for storing a plurality of messages received from the decoder means, each message being constituted by a plurality of blocks with characters received block by block and a register (42) for storing the same message received at a later time, said receiver further comprising an error detector means (41) in the signal processor means (4), said error detector means being connected to said decoder means for detecting errors in the characters in a received block on the basis of control characters included in said block said register further being adapted to store the characters of the received blocks and to store an indication as to errors in the received blocks, and a combination logic means (46) for combining a final version of a message from associated blocks from an associated message stored in the register (42) and from an associated message stored in the message memory (45), such that the selection of blocks is based on determining the blocks including the least errors, and an ID register means (44) for storing an identity code of the received messages and controlling combination of corresponding messages stored in the register (42) and message memory (45) based on identity of the identity codes.

6. A receiver as claimed in claim 5 comprising a block counter (43), adapted for counting the number of blocks in a received message and for providing information on the number of blocks to the combination logic means (46) for comparing with information inserted in the message as to the number of blocks in the message.