Multiplex communications – Fault recovery
Reexamination Certificate
2000-11-03
2004-08-03
Decady, Albert (Department: 2133)
Multiplex communications
Fault recovery
C375S224000, C714S048000, C379S093010, C370S332000, C370S522000
Reexamination Certificate
active
06771592
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to communications; more specifically, wireless communications.
2. Description of the Related Art
In the past, communication channels were used to communicate both speech and data related information from a transmitter to a receiver. When in the first mode, the communication channel carried speech information and when in a second mode the communication channel carried data information. The transition from speech to data mode or from data to speech mode was indicated through the use of one or more control words. Unfortunately, if the control word was missed or misinterpreted, a receiver would not detect this transition between modes.
SUMMARY OF THE INVENTION
The present invention provides a method for detecting and recovering from missed control words that signify a transition to or from a speech mode to a data mode or from a data mode to a speech mode in a communication channel. When in a speech mode, speech information is checked for errors. If an error is detected, the next frame or segment of information is assumed to be data information. The data information is examined for valid information such as a valid header. If a valid header is detected, data mode is assumed and if a valid header is not detected, speech mode is assumed.
REFERENCES:
patent: 5822315 (1998-10-01), de Seze et al.
patent: 5867510 (1999-02-01), Steele
patent: 5940405 (1999-08-01), Sakuma
patent: 6553065 (2003-04-01), Tuutijarvi
patent: WO 00/45555 (2000-08-01), None
patent: WO00/45555 (2000-08-01), None
IBM Technical Disclosure, “Error Control for Voice/Data Packet Network”, Dec. 1, 1986, vol. 29, Issue 7, pp 3092-3095.*
Jauregui Acosta et al., “Internet Services on Enhanced CDPD Systems”, Jul. 6-8, 1999, Proceedings IEEE International Symposium on Computers and Communications, IEEE Commun. Soc., pp 87-92, 1999.
De'cady Albert
Lucent Technologies - Inc.
Trimmings John P
LandOfFree
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