Uplink communication method and radio terminal in radio communication system

A technology of a radio terminal and a communication method, applied in the field of uplink communication and radio terminals in a radio communication system, can solve problems such as power consumption rate deterioration, radio communication equipment interference, etc., achieve transmission electric power suppression, reduce interference, reduce The effect of power consumption

Inactive Publication Date: 2008-03-19
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the power consumption rate of UE 200 to deteriorate, and causes interference to other radio communication devices

Method used

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  • Uplink communication method and radio terminal in radio communication system
  • Uplink communication method and radio terminal in radio communication system
  • Uplink communication method and radio terminal in radio communication system

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Embodiment Construction

[0061] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0062] [A] Overview

[0063] FIG. 1 is a diagram schematically showing the structure of a mobile communication system according to an embodiment of the present invention. The mobile communication system shown in FIG. 1 includes a radio base station (BTS: Base Transceiver Station) 1 and a mobile station (MS: Mobile Station) as a radio communication system capable of performing radio communication with BTS1 within a radio area (cell) 1a formed by BTS1. A radio (user) terminal (UE) such as a cellular telephone. In this embodiment, it is assumed that downlink communication from BTS1 to MS (sometimes referred to as UE) 2 is performed with HSDPA, and uplink communication from MS2 to BTS1 is performed with HSUPA. Incidentally, the number of BTS1 may be one or more, and so is the number of MS2.

[0064]In general, the reception quality o...

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Abstract

A radio terminal (2) estimates a reception quality of an uplink signal at a radio base station (1) based on a downlink signal received from the radio base station (1), and controls transmission timing to the radio base station (1) of a transmission request (SI) for obtaining permission to transmit the uplink signal. Whereby, it is possible to control the transmission timing of the request for obtain permission to transmit the uplink signal from the radio base station (1), decrease a transmission electric power of the radio terminal (2), and obtain an expected throughput.

Description

technical field [0001] The present invention relates to an uplink communication method and a radio terminal in a radio communication system, and more particularly, to a technique suitable for use in a radio communication system performing communication by radio in W-CDMA (Wideband Code Division Multiple Access). Background technique [0002] W-CDMA is one of radio communication interfaces defined by IMT-2000 (International Mobile Telecommunications-2000), which is at the position of a representative radio communication system. [0003] W-CDMA enables multimedia access of voice, moving images, data, etc. at a transmission rate of up to 384 kbps. [0004] Communication systems called HSDPA (High Speed ​​Downlink Packet Access) and HSUPA (High Speed ​​Uplink Packet Access) based on W-CDMA technology are being researched and developed in recent years. [0005] Compared with the current W-CDMA, HSDPA is a technology for performing high-speed downlink packet transmission in the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04Q7/32H04W28/00H04W52/02H04W52/14H04W68/02H04W74/04H04W74/08H04W76/02
CPCH04W74/0808Y02B60/50H04W52/146
Inventor 仁部启司
Owner FUJITSU LTD
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