US 9,806,857 B2Granted

Communication apparatus and communication method

AssigneeSun Patent Trust

InventorsAkihiko Nishio, Seigo Nakao

Life of this patent

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Abstract

A wireless communication base station apparatus prevents degradation of throughput of LTE terminals, even when LTE terminals and LTE+ terminals are present together. A setting section sets in each subframe a resource block in which is arranged a reference signal that is employed solely by LTE+ terminals, based on the pattern of arrangement of reference signals employed solely by LTE+ terminals. As to symbols that are mapped to antennas (110-1) to (110-4), an arrangement section arranges the characteristic cell reference signals employed by both LTE terminals and LTE+ terminals in all of the resource blocks in a single frame. In contrast, as to symbols that are mapped to antennas (110-5) to (110-8), the arrangement section arranges in some of the resource blocks, that are set in accordance with the setting results input from a setting section, the characteristic cell reference signals that are employed solely by the LTE+ terminals.

Claims14

Dependent claims

A communication apparatus comprising:

circuitry which, in operation, maps a first reference signal in all of subframes, into which a frame is divided and which includes a first subframe, a second subframe and a third subframe, and maps a second reference signal in the first subframe and the third subframe with a given period therebetween, the first reference signal being used for computing a CQI in a first terminal for a first communication system and a second terminal for a second communication system, the second reference signal being used for computing a CQI in the second terminal, and no second reference signal being mapped in the second subframe between the first subframe and the third subframe, wherein a CQI is a channel quality indicator;
and
a transmitter which, in operation, transmits the first reference signal and the second reference signal;
and
a receiver which, in operation, receives the CQI,
wherein the second reference signal is a cell-specific reference signal, and a number of resources to which the second reference signal is mapped per resource block is lower than a number of resources to which the first reference signal is mapped per resource block, and the circuitry, in operation, performs an adaptive scheduling based on the CQI.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/931,121Filed 3 Nov 2015 · continuation
Priority: JP 2008-16303323 Jun 2008
Published: US 2016/0056924 A125 Feb 2016
Granted: 31 Oct 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

H04L 1/1861
Arrangements specially adapted for the receiver end: physical mapping arrangements
H04B 7/0426
MIMO systems: power distribution
H04B 7/0632
Feedback content: channel quality parameters, e.g. channel quality indicator [CQI]
H04J 11/003
Of multi-user interference: at the transmitter

Family

PCT/JP2009/002824Parent of this continuation · filed 22 Jun 2009
US 2016/0056924 A1Pre-grant publication · published 25 Feb 2016
Application12/999,044Parent of this continuation
US 9,219,532 B2Parent of this continuation
US 2011/0103343 A1Published application
US 9,806,857 B2This patent

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