System for handling data errors on a cellular communications system PCM link
US5491719A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1993 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Jul 2, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0083
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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 d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.