| 摘要 |
The PDCAB packet (300) and the RRA packet (308) are transmitted together on the F-SCCH. For example, 9 RRA bits (305) are appended to the PDCAB field (303), in place of the pad bits (205), thereby allowing both the PDCAB (303 ) and RRA (311) messages to be protected against errors by a 16-bit CRC (307 ). In accordance with the embodiments, a receiver is able to distinguish bet ween the varying PDCAB (303) and RRA (305) message formats and transmitting the packets (300) and (308) together is a normal mode of operation in the em bodiments. Therefore, in accordance with the embodiments, when the PDCAB pac ket (300) and RRA packet (308) are transmitted together, the network replace s the N PDCAB pad bits, such as pad bits (205), with the first N bits from t he RRA bitmap (311), in order to use the nominal CRC length for both packets (300) and (308).
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