초록 ▼

In a digitally trunked radio repeating system that may include several radio site repeating transceivers, a site area identification coding system to ensure that transmissions intended for one site or as one mode are not decoded by another site or as another transmission mode. In particular, a site

In a digitally trunked radio repeating system that may include several radio site repeating transceivers, a site area identification coding system to ensure that transmissions intended for one site or as one mode are not decoded by another site or as another transmission mode. In particular, a site or transmission mode identification byte is used in the transmission error coding (CRC) scheme applied by both a mobile transceiver and the radio site repeater. Since the identification byte is used in the transmitter to calculate the CRC error correction data, the same identification byte must be used in the receiver to decode the CRC value. The intended radio site or transmission mode wilt apply the proper identification byte to decode a transmission. The wrong radio site or mode will not correctly decode the CRC value in a transmission because the wrong identification byte will be applied to the transmission. Accordingly, a transmission received by the wrong radio site or at a transceiver operating in a mode different that the transmission will not properly decode the transmission due to a CRC error caused by applying the wrong identification byte.

대표청구항 ▼

[ What is claimed is:] [1.] A method for communicating digital signals between a radio frequency (RF) mobile radio unit and an RF base station site having a controller comprising:(a) packaging digital information to be transmitted from the mobile radio units in a series of bytes;(b) assembling a pre

[ What is claimed is:] [1.] A method for communicating digital signals between a radio frequency (RF) mobile radio unit and an RF base station site having a controller comprising:(a) packaging digital information to be transmitted from the mobile radio units in a series of bytes;(b) assembling a predetermined number of the series of bytes from step (a) for transmission;(c) calculating an error detection value dependent upon the bytes assembled in step (b) and at least one non-transmitted identification byte having a first predetermined bit setting, where said bit setting is relatively unique, and where the at least one non-transmitted identification byte is defined by data previously received by the mobile radio unit from an assigned base station site;(d) transmitting the bytes assembled in step (b) with the error detection value calculated in step (c) from the mobile radio unit and reception of the transmission by an RF base station site;(e) calculating in the base station site controller an error detection value from the bytes received in step (d) and from at least one identification byte stored in the site controller, where the at least one identification byte stored in the site controller for the assigned base station site corresponds to the at least one non-transmitted identification byte defined by the data previously received by the mobile radio;(f) comparing in the base station site controller the error detection value calculated in step (e) to the error detection value received in step (d);(g) decoding the bytes received in step (d) if the comparison in step (f) matches the two error detection values;(h) discarding the bytes received in step (d) if the comparison in step (f) does not match the two error detection values, and(j) prior to step (a), the mobile radio unit receives information identifying the non-transmitted byte from a base station site in conjunction with assigning the mobile radio to the site.