Pulse or digital communications – Repeaters – Testing
Patent
1993-07-02
1996-02-13
Coles, Sr., Edward L.
Pulse or digital communications
Repeaters
Testing
371 31, 379 63, H04B 346, G06F 1100, H04M 1100
Patent
active
054917190
ABSTRACT:
A digital cellular communications system has a bidirectional pulse code modulation (PCM) link for conveying encoded speech and control data in the form of blocks, a switching unit coupled to a first end of the PCM link, and a base station coupled to a second end of the PCM link. The switching unit includes a speech encoder for encoding speech signals, an error detection code generator for generating an error detection code from the encoded speech signal, and a formatter, coupled to the error detection code generator, for producing a formatted block to be transmitted on the PCM link, the formatted block having a header, the encoded speech dam, and the error detection code. The base station has a PCM link error detector for signalling the existence of an error in a received block in response to the received block containing an error. The base station further includes a downlink error handler coupled to the PCM link error detector, for discarding a received block in response to the signal indicating the existence of an error therein, and for substituting therefor a default control message to be relayed to a mobile station, the default control message having no meaning defined by the digital cellular communications system, whereby the mobile station, in response to receiving the default control message, performs no operation other than a bad frame masking operation. Uplink error detection and handling is also provided.
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Fall Orjan P. S.
Molin Anders K.
Sellin Patrik C.
Wilhelmsson Lars J.
Coles Sr. Edward L.
Esposo Allan A.
Telefonaktiebolaget LM Ericsson
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