US 9,853,760 B2Granted

Terminal station apparatus, base station apparatus, transmission method and control method

AssigneeSun Patent Trust

InventorsYoshihiko Ogawa, Akihiko Nishio, Takashi Iwai, Seigo Nakao, Daichi Imamura, Atsushi Sumasu

Life of this patent

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Abstract

A terminal apparatus is disclosed wherein even in a case of applying SU-MIMO and MU-MIMO at the same time, the inter-sequence interference in a plurality of pilot signals used by the same terminal can be suppressed to a low value, while the inter-sequence interference in pilot signal between terminals can be reduced. In this terminal apparatus: a pilot information deciding unit decides, based on allocation control information, Walsh sequences of the respective ones of first and second stream groups at least one of which includes a plurality of streams; and a pilot signal generating unit forms a transport signal by using the decided Walsh sequences to spread the streams included in the first and second stream groups. During this, Walsh sequences orthogonal to each other are established in the first and second stream groups, and users are allocated on a stream group-by-stream group basis.

Claims18

Dependent claims

A communication apparatus comprising:

a transmitter, which, in operation, transmits, to a terminal, control information, which determines an association of a cyclic shift value and an orthogonal sequence for each of a plurality of layer numbers;
and
a receiver, which, in operation, receives, from the terminal, a reference signal, which is generated using the cyclic shift value and the orthogonal sequence based on the association determined by the control information, the orthogonal sequence being one of two orthogonal sequences corresponding to a first orthogonal sequence [1, 1] and a second orthogonal sequence [1, −1], the cyclic shift value being one of 12 cyclic shift values ranging from 0 to 11, and the reference signal being multiplexed with a data signal having a bandwidth, which is different from a bandwidth of a data signal transmitted by another terminal,
wherein:
when the first orthogonal sequence is used, the receiver, in operation, receives the reference signal multiplied by 1 on a first slot, and the reference signal multiplied by 1 on a second slot, and when the second orthogonal sequence is used, the receiver, in operation, receives the reference signal multiplied by 1 on the first slot, and the reference signal multiplied by −1 on the second slot;
and
two cyclic shift values with a difference of 6 are respectively associated with the two orthogonal sequences for one of the layer numbers.

4 more elements

A communication method comprising:

transmitting, to a terminal, control information, which determines an association of a cyclic shift value and an orthogonal sequence for each of a plurality of layer numbers;
and
receiving, from the terminal, a reference signal, which is generated using the cyclic shift value and the orthogonal sequence based on the association determined by the control information, the orthogonal sequence being one of two orthogonal sequences corresponding to a first orthogonal sequence [1, 1] and a second orthogonal sequence [1, −1], the cyclic shift value being one of 12 cyclic shift values ranging from 0 to 11, and the reference signal being multiplexed with a data signal having a bandwidth, which is different from a bandwidth of a data signal transmitted by another terminal,
wherein:
when the first orthogonal sequence is used, the reference signal multiplied by 1 is received on a first slot, and the reference signal multiplied by 1 is received on a second slot, and when the second orthogonal sequence is used, the reference signal multiplied by 1 is received on the first slot, and the reference signal multiplied by −1 is received on the second slot;
and
two cyclic shift values with a difference of 6 are respectively associated with the two orthogonal sequences for one of the layer numbers.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/358,714Filed 22 Nov 2016 · continuation
Priority: JP 2009-2296491 Oct 2009
Published: US 2017/0078039 A116 Mar 2017
Granted: 26 Dec 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

H04J 11/003
Of multi-user interference: at the transmitter
H04B 7/0452
MIMO systems: multi-user MIMO systems
H04B 7/0689
Hybrid systems, i.e. switching and simultaneous transmission: using different transmission schemes, at least one of them being a diversity…
H04J 13/0048
Orthogonal: walsh

Family

PCT/JP2010/005893Parent of this continuation · filed 30 Sep 2010
Application14/547,042Parent of this continuation · filed 18 Nov 2014
US 8,917,587 B2Parent of this continuation · filed 23 Dec 2014
Application14/848,149Parent of this continuation · filed 8 Sep 2015
US 9,166,666 B2Parent of this continuation · filed 20 Oct 2015
Application15/191,317Parent of this continuation · filed 23 Jun 2016
US 9,401,755 B2Parent of this continuation · filed 26 Jul 2016
US 2017/0078039 A1Pre-grant publication · published 16 Mar 2017
US 9,537,596 B2Parent of this continuation
Application13/394,789Parent of this continuation
US 2012/0170444 A1Published application
US 2015/0078151 A1Published application
US 2015/0381257 A1Published application
US 2016/0308634 A1Published application
US 9,853,760 B2This patent

From the US filing history. Foreign family members aren’t listed.