Apparatus and method for acquiring frame synchronization in a mobile communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsChul-Ho Jo, Joon-Dong Lee, Kwang-Sung Yang
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Abstract
Disclosed is a method for acquiring frame synchronization of a broadcasting channel (BCH) in an asynchronous mobile communication system. The method comprises acquiring system timing through a synchronization channel; performing CRC by demodulating for a predetermined time duration a primary common control physical channel (PCCPCH) based on the system information, re-designating a demodulating duration according to the CRC result, and performing CRC; and acquiring frame synchronization of the BCH when the CRC is consecutively passed at least two times.
Claims15
A method for acquiring frame synchronization of a broadcasting channel (BCH) in an asynchronous mobile communication system, the method comprising:
- acquiring synchronization of a radio frame having a predetermined duration through a synchronization channel;
- decoding a predetermined position of the radio frame having the predetermined duration for a double duration and performing a Cyclic Redundancy Check (CRC) on the decoding result at a time that the synchronization is acquired wherein when the CRC fails, the CRC is performed by demodulating again from a succeeding 10 msec duration of the CRC 20 msec duration, increasing a CRC counter if the CRC passes, and then determining whether a value of the CRC counter is larger than 2 performing the CRC by demodulating the 20 msec duration after the CRC duration, when the value of the CRC counter is less than 2;
- acquiring frame synchronization of the BCH if the value of the CRC counter is larger than 2;
- and
- if the CRC is consecutively passed at least twice, adding up two frames received from the synchronization acquired time and decoding the added frames for one duration thereby acquiring synchronization of the BCH.
An apparatus for acquiring frame synchronization of a broadcasting channel (BCH) in an asynchronous mobile communication system, comprising:
- a demodulator for, based on timing acquired through a synchronization channel, decoding a predetermined position of a radio frame having a predetermined duration for a double duration and performing a CRC check on the decoding result at a time that the synchronization is acquired wherein when the CRC fails, the CRC is performed by demodulating again from a succeeding 10 msec duration of the CRC 20 msec duration, increasing a CRC counter if the CRC passes, and then determining whether a value of the CRC counter is larger than 2 performing the CRC by demodulating the 20 msec duration after the CRC duration, when the value of the CRC counter is less than 2;
- acquiring frame synchronization of the BCH if the value of the CRC counter is larger than 2;
- and
- a controller for adding up two frames received from the synchronization acquired time and decoding the added frames for one duration thereby acquiring synchronization of the BCH, if the CRC check is consecutively passed at least twice.
Dependencies are inferred from the claim text.