Communication system, base station apparatus, mobile station apparatus, and communication method

a communication system and mobile station technology, applied in multiplex communication, orthogonal multiplex, wireless commuication services, etc., can solve the problems of insufficient demodulation reference signal, degraded communication quality, and difficult to control the frequency utilization efficiency of the frequency, so as to reduce interference between adjacent cells

Active Publication Date: 2014-07-17
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0031]According to the present invention, interference between adjacent cells is reduced.

Problems solved by technology

Although even a mobile station apparatus in a cell edge (cell end) region communicates without being interfered by using different frequencies between adjacent cells (sectors), frequency usage efficiency is problematic.
However, a mobile station apparatus in the cell edge region is likely to be affected by interference from an adjacent cell, and communication quality is degraded.
In coordinated communications, orthogonal resources alone of a uplink demodulation reference signal (DMRS: Demodulation Reference Signal) of LTE are insufficient to ensure orthogonality between the cells (transmission and reception points).

Method used

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  • Communication system, base station apparatus, mobile station apparatus, and communication method
  • Communication system, base station apparatus, mobile station apparatus, and communication method
  • Communication system, base station apparatus, mobile station apparatus, and communication method

Examples

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first embodiment

[0097]A first embodiment of the communication system comprising the base station apparatus 100 and the mobile station apparatus 200 is described below. In the first embodiment, the base station apparatus 100 notifies the mobile station apparatus 200 of the DCI format. The DCI format comprises resource allocation information as to whether to allocate DMRS in localized resource allocation or distributed resource allocation, and information on a frequency offset of the DMRS. The frequency offset of the DMRS is a mobile station apparatus specific parameter (or a UE specific parameter). If distributed resource allocation is enabled based on the resource allocation information transmitted using the DCI format, the mobile station apparatus 200 determines the DMRS resource allocation using the frequency offset of the DMRS. The DCI format comprising information as to the availability of frequency offset hopping for the DMRS may be notified to the mobile station apparatus 200. If the frequenc...

second embodiment

[0121]A second embodiment of the communication system comprising the base station apparatus 100 and the mobile station apparatus 200 is described. A general device configuration of the second embodiment remains unchanged from that of the first embodiment, and the discussion thereof is omitted herein. In the second embodiment, the base station apparatus 100 notifies the mobile station apparatus 200 of a DCI format comprising resource allocation information for DMRS, a frequency offset, and a frequency offset shift pattern. The frequency offset and the frequency offset shift pattern are parameters being used for the DMRS distributed allocation, and the frequency offset is the mobile station apparatus specific parameter and the frequency offset shift pattern is the cell specific parameter. If the distributed resource allocation is enabled based on the resource allocation information for the DMRS transmitted using the DCI format, the mobile station apparatus 200 determines the DMRS reso...

third embodiment

[0127]A third embodiment of the communication system comprising the base station apparatus 100 and the mobile station apparatus 200 is described. A general device configuration of the third embodiment remains unchanged from that of the first embodiment, and the discussion thereof is omitted herein. In the third embodiment, the base station apparatus 100 notifies the mobile station apparatus 200 of a DCI format comprising resource allocation information of DMRS, a frequency offset specific to the mobile station apparatus in DMRS distributed resource allocation, and information indicating a cyclic shift (CS) performed on an uplink demodulation reference signal and an orthogonal cover code (OCC) (Cyclic shift for DM RS and OCC index). If the distributed resource allocation is enabled based on the resource allocation information for the DMRS in accordance with the DCI format, the mobile station apparatus 200 determines a frequency offset hopping pattern for the DMRS distributed resource...

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Abstract

Provided are a communication system, a base station apparatus, a mobile station apparatus, and a communication method for reducing interference between uncoordinated adjacent cells. The communication system of the present invention comprises a base station apparatus and a mobile station apparatus. The base station apparatus notifies the mobile station apparatus of a downlink control information format, the downlink control information format including resource allocation information that dictates switching of resource allocation of an uplink demodulation reference signal localized resource allocation and distributed resource allocation, and a frequency offset of the distributed resource allocation of the uplink demodulation reference signal specific to the mobile station apparatus. The mobile station apparatus determines the resource allocation of the uplink demodulation reference signal in accordance with the frequency offset of the mobile station apparatus when information comprised in the downlink control information format dictates the distributed resource allocation in the resource allocation information, and transmits the uplink demodulation reference signal to the base station apparatus.

Description

TECHNICAL FIELD[0001]The present invention relates to a communication system, a base station apparatus, a mobile station apparatus and a communication method.BACKGROUND ART[0002]3GPP (3rd Generation Partnership Project) is a project that is intended to study and formulate specifications of a mobile communication system based on a network that is upgraded from W-CDMA (Wideband-Code Division Multiple Access) and GSM (registered trademark) (Global System for Mobile Communications). Currently being studied under 3GPP, with the advance of the third-generation radio access technology (hereinafter referred to as “LTE (Long Term Evolution)” or “EUTRA (Evolved Universal Terrestrial Radio Access)” and the use of a wider frequency bandwidth, is a mobile communication system (hereinafter referred to as “LTE-A (Long Term Evolution-Advanced)” or “Advanced-EUTRA”) that permits even higher data transmission and reception.[0003]As a communication scheme in LTE, 3GPP is studying, for a downlink, OFDM...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L5/00
CPCH04L5/0053H04J11/0053H04L5/0051H04L5/0073H04L5/0012H04W72/00H04W72/20H04L27/14
Inventor OUCHI, WATARUSUZUKI, SHOICHIAIBA, TATSUSHINAKASHIMA, DAIICHIRO
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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