Samsung Electronics Co., Ltd.

Seong Kyu Song

Jae Dong Jung

Seong Yun Ko

Myeon Kee Youn

A connection control system and method for Wireless Broadband (WiBro) communication system are provided. The connection control method for a mobile communication system, which includes at least one radio access station for providing communication service to a portable subscriber station, and at least one access control router for controlling the radio access station, includes relaying, at a radio access station, an initial ranging request message from the portable subscriber station to an access control router; transmitting, at the access control router received the initial ranging request message, an initial ranging response message to the radio access station and neighbor radio access stations; and relaying, at a radio access station currently synchronized with the portable subscriber station and received the initial ranging response message, the initial ranging response message to the portable subscriber station.

Connection control system and method for mobile communication system

An inter-symbol interference cancellation method for an orthogonal frequency division multiple access system is provided. The inter-symbol interference cancellation method includes transmitting, at a base station, an OFDMA symbol having a first half part and a second half part divided in time; receiving, at a mobile station, the OFDMA symbol; and restoring the OFDMA symbol by repeating one of the first half part or the second half part. The ISI cancellation method for an OFDMA communication system of the present invention uses an OFDMA symbol having two identical parts sequentially arranged in time, whereby it is possible to recover a transmitted OFDMA symbol if at least one of the two parts is successfully received.

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Seoul, South Korea

Seong Kyu Song