Method for implementing a modified radio link protocol

Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction

Reexamination Certificate

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C714S749000, C714S811000

Reexamination Certificate

active

06941500

ABSTRACT:
A method of performing a modified RLP that reduces the transmission delay in a communications system by detecting frame erasures when they occur. The modified RLP method requests retransmission of erased frames based on pattern violations instead of sequence number violations. The method is preconditioned to expect a particular repeating pattern of frame delivery. For a system running a VSELP vocoder, the method in a receiving device expects to receive full rate or data (F) and DTX (D) frames in a repeating pattern FFDFFDFFD. For a system running an AMBE vocoder, the method in a receiving device expects to receive frames in a repeating pattern DFDFDFDD. The method detects when the pattern is violated and in desired instances immediately requests retransmission of the expected frame.

REFERENCES:
patent: 6011796 (2000-01-01), Rezaiifar et al.
patent: WO 98/42108 (1998-09-01), None
patent: WO 9959299 (1999-11-01), None
Xylomenos, G. et al.; Internet Wireless Link Performance; Aug. 1, 1998; Computer Systems Laboratory, Department of Computer Science Engineering, University of California San Diego, La Jolla California; pp. 1-26.
Telecommunications Industry Association / Electronic Industry Alliance Interim Standard : “Data Service Options for Spread Spectrum Systems” TIZ/EIA/IS-707-A-2, Mar. 2001, pp 1-129.

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