Radio communication system and antenna configuration determination method
AssigneeNtt Docomo, Inc.
InventorsYuki Inoue, Daiki Takeda
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Abstract
In a radio communication system performing radio communications using multiple antenna ports, a radio base station apparatus transmits a reference signal from each of the antenna ports in multiple patterns corresponding to a plurality of antenna port configurations formed of single antenna elements or groups of antenna elements, and determines the antenna elements that form the respective antenna ports based upon feedback information supplied from a mobile device that has received the reference signal in the multiple patterns.
Claims8
A radio communication system comprising:
- a radio base station apparatus,
- wherein the radio base station apparatus has a plurality of antenna port configurations formed of one or more antenna ports including single antenna elements or groups of antenna elements each grouped in an array arranged in both a horizontal direction and a vertical direction, and
- wherein the radio base station apparatus is configured to transmit a reference signal from each antenna port formed by one or more antenna elements each transmitting a polarized wave in patterns corresponding to said plurality of antenna port configurations;
- and
- a mobile device,
- wherein the mobile device is configured to receive the reference signal for each of the patterns and transmit feedback information to the radio base station apparatus,
- wherein the radio base station apparatus is configured to determine an antenna element that forms said each antenna port and a number of symbol streams multiplexed over a Multiple Input Multiple Output (MIMO) channel based upon the feedback information, and
- wherein an antenna port of a first antenna port configuration comprises a single antenna element, an antenna port of a second antenna port configuration comprises 2×2 antenna elements, and an antenna port of a third antenna port configuration comprises 4×4 antenna elements.
An antenna configuration determination method, comprising:
- at a base station apparatus, transmitting a reference signal from each antenna port formed by one or more antenna elements each transmitting a polarized wave in multiple patterns corresponding to a plurality of antenna port configurations formed of one or more antenna ports including single antenna elements or groups of antenna elements each grouped in an array arranged in both a horizontal direction and a vertical direction;
- and
- determining an antenna element that forms said each antenna port and a number of symbol streams multiplexed over a Multiple Input Multiple Output (MIMO) channel based upon feedback information supplied from a mobile device that has received the reference signal in said multiple patterns,
- wherein an antenna port of a first antenna port configuration comprises a single antenna element, an antenna port of a second antenna port configuration comprises 2×2 antenna elements, and an antenna port of a third antenna port configuration comprises 4×4 antenna elements.
Dependencies are inferred from the claim text.