Patent ID: 7751445
Filing Date: 2010-07-06
Classification: H04B,H04J

Abstract:
1. A base station apparatus in a CDMA/TDD mobile communication system in which a signal is formed employing a frame configuration with a plurality of time slots, the base station apparatus comprising: a first control channel former that forms a first control channel including a first symbol that is spread with a first short spreading code used to acquire synchronization at a mobile station; a selector that selects a second short spreading code, out of a plurality of short spreading codes, and a phase difference between the first short spreading code and the second short spreading code, based on a size of an offset and an order of time slots in the plurality of time slots, the size being determined for a cell; a second control channel former that forms a second control channel including a second symbol spread with a second short spreading; a traffic channel former that forms a traffic channel including a symbol spread with a long spreading code used to identify the cell; and a transmitter that transmits the first symbol in the first control channel and the second symbol in the second control channel, at a same timing as the offset after a division of a time slot, the selected phase difference being provided between the first symbol and the second symbol, and transmits the symbol spread with the long spreading code in the traffic channel.