Excavating
Patent
1986-06-30
1988-08-16
Smith, Jerry
Excavating
371 53, 371 67, G06F 1108
Patent
active
047649283
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to apparatus and methods for receiving messages sent by radio.
BACKGROUND
In the field with which the invention is concerned, the transmission of messages is one-way and, from the receiver side, it is impossible to affect transmission from the transmitter and to request and obtain the repetition of messages. The present state of the art with respect to radio reception and receivers, particularly with regard to receivers for personnel location, is described inter alia in Patent Application GB No. 2,101,779A, published in January 1983, as a personnel locator adapted for receiving calls sent by radio and for receiving and storing a plurality of messages and for presenting one message at a time in a display window. The received message is compared with each of the already stored messages and is stored in the receiver's memory only if it differs from all the messages already stored. A further case where repeated messages may be received is when the receiver is in a boundary area where the reception area associated with two time-displaced radio transmitters situated adjacent each other overlap each other; the same message can then be received first from one transmitter and then from the second transmitter.
With the intention that the probability of a message's being correctly received should be increased, the message is sent repeatedly, according to the above-mentioned British Patent Application, but the mentioned comparison prevents its being stored more than once. A weakness in the thus described personnel locator is that if a character in one of the received messages has been received in a distorted condition, the comparison cannot show that the same message has been received, and different versions of the same message will be stored twice and possibly several times.
There is further described an example of a method for transmitting and receiving personnel location calls in "Final Report of the British Post Office Code Standardisation Advisory Group (POCSAG)", London, 1978.
SUMMARY OF THE INVENTION
According to the invention, a reception method is characterized by the additional procedural steps of identifying the message with guidance from an identity code transmitted in it. The identity code may be of any kind at all and may, for example, be a part of the message itself, the format of the identity code being free from any controlling rule. Since the probability of a small part of a message being error-free is greater than the probability of an entire message being error-free, the reliability in the identification of two like messages will be greater in the method in accordance with the invention than with previously known methods. The identification is utilized to give a received message with the same identity code as one that is already stored a particular treatment which may consist of ignoring it.
The invention may employ different types of identity codes, such as a character combination inserted in an introductory block in the message. The method is applicable whether the associated receiver is adapted for storing a plurality of different messages or only one message.
When storing the characters of the message in blocks is included in the method of reception, it is part of the inventive identification to compare a selected number of blocks, which is less than all the blocks of the message and at least one block, from the last received message with corresponding blocks from the message or messages already received. Included in a development of the method is the investigation, on the basis of check characters inserted in each block, of whether the block contains any incorrectly received character and, if this is the case, storing an error indication in the message memory together with the block and restricting the comparison to error-free blocks. Messages to be received in the receiver may begin with the address code of the receiver. The receiver is adapted solely to receive messages each respectively containing its own address code.
A receiver for carry
REFERENCES:
patent: 4653055 (1987-03-01), Micic
Beausoliel Robert W.
Smith Jerry
Telefonaktiebolaget LM Ericsson
LandOfFree
Method and apparatus in radio reception for avoiding storing a m does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus in radio reception for avoiding storing a m, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus in radio reception for avoiding storing a m will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-604680