Multiplex communications – Diagnostic testing – Determination of communication parameters
Patent
1996-04-16
1997-02-25
Olms, Douglas W.
Multiplex communications
Diagnostic testing
Determination of communication parameters
370337, 379 63, H04J 316
Patent
active
056065485
ABSTRACT:
A method is disclosed for a user terminal (10) to obtain access to a DCCH transmitted on a TDM radio channel of a wireless communications system that also includes at least one TDM radio channel that transmits a DTC. The DCCH and DTC are each comprised of slots partitioned into fields. A first step (a) tunes a receiver (16) to a radio channel, receives a first slot, and decodes a predetermined first field from the first slot. The predetermined first field is a 12-bit CSFP field if the radio channel conveys a DCCH, or a 12-bit CDVCC if the radio channel conveys a DTC. A second step of the method calculates a CRC over the first field to determine if the first field is the CSFP field. If yes, the user terminal assumes that the radio channel conveys the DCCH and then uses information from the DCCH to access the wireless system. If the first field is determined not to be the CSFP field, the user terminal assumes that the radio channel conveys a DTC, and then calculates a CRC over the first field to determine if the CDVCC field was correctly received. If the CDVCC field is determined to be correctly received, the user terminal calculates a CRC over the CDL field to determine if the CDL field was correctly received. If the CDL field is determined to be correctly received, and after both the CDVCC and CDL fields are correctly received from n slots, the user terminal employs the CDL field to identify a radio channel that conveys a DCCH, thereby enabling the user terminal to access the system.
REFERENCES:
patent: 5170412 (1992-12-01), Massey
patent: 5276691 (1994-01-01), Kivari
patent: 5396653 (1995-03-01), Kivari et al.
patent: 5430740 (1995-07-01), Kivari et al.
TDMA Forum Implementation Guide: "Non-Public Mode Operation and Selection in IS-136 Compliant Mobile Stations", Version Ref. No. 2.0, Mar. 9, 1995.
Vayrynen Mika
Ylitervo Matti
Nokia Mobile Phones Limited
Olms Douglas W.
Phillips Matthew C.
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