Mobile telecommunication system, mobile terminal, its transmission diversity application system

Abstract

A mobile terminal can effectively perform transmit diversity of PDSCH and DPCH without increasing the number of bits of control information fed back to a base station and without providing a longer feedback cycle. When the first PDSCH data is received during soft handoff, the feedback information generating part determines transmit diversity control information for the PDSCH in response to the handover command from the control part according to the signal reception status of the cell sending the PDSCH data. In addition, when the last PDSCH data is received during soft handover, the feedback information generation part determines the transmission diversity control information for the DPCH in response to the handover command from the control part according to the receiving state of the cell signal of the active device after synthesis.

Description

technical field [0001] The present invention relates to a mobile communication system, a mobile terminal and a transmit diversity application system used therefor, in particular, to a system for applying closed-loop transmit diversity to both PDSCH (Physical Downlink Shared Channel) and DPCH (Dedicated Physical Channel) . Background technique [0002] In recent years, mobile terminals (mobile stations) such as portable phones are increasingly provided with multimedia functions that can be used to process large-capacity still images, short-term animations, etc., so that large-capacity and high-speed Data emission method. [0003] For this large-capacity and high-speed data transmission method, the PDSCH method, which only accelerates the downlink (from the base station to the mobile station) transmission speed, the HS-PDSCH (High Speed ​​Physical Downlink Shared Channel) method, etc. have been proposed. [0004] As for the system using the PDSCH method, there is a system in...

AI Technical Summary

Problems solved by technology

[0009] For the above-mentioned conventional system using the PDSCH method, in the case where closed-loop type transmit diversity is applied to both PDSCH and DPCH, different control information is required between PDSCH and DPCH during soft handover, so that The corresponding control information of DPCH is fed back to the base station, resulting in an increase in the number of bits of control information transmitted to the base station

[0010] In addition, if the number of bits of control information sent to the base station is fixed, since the corresponding control information on PDSCH and DPCH are sent to the base station separately, a long feedback period needs to be provided, so that these characteristics deteriorate in a relatively high-speed fading environment and Reduced circuit capacity

Images