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Wireless communication system, mobile station apparatus and random access method

A wireless communication system and random access technology, applied in wireless communication, transmission system, multi-frequency code system, etc., can solve the problems of deterioration of response time, random access conflict, etc., and achieve the effect of short random compensation time and variable random compensation time

Inactive Publication Date: 2009-08-19
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0042] The problem to be solved is that in the system based on the proposal of EUTRA, the random access of the mobile station device that requires relatively quick establishment of the wireless connection will conflict with the random access from other mobile station devices. Deterioration in reaction time from visit to successful random visit

Method used

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  • Wireless communication system, mobile station apparatus and random access method
  • Wireless communication system, mobile station apparatus and random access method
  • Wireless communication system, mobile station apparatus and random access method

Examples

Experimental program
Comparison scheme
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Embodiment approach 1

[0211] In this embodiment, the mobile station apparatuses MS1 to MS4 in the Dormant mode set the upper limit of the random compensation to a value shorter than the set value in the Idle mode, and set the random compensation time within the range of the time interval. In this way, the mobile station devices MS1-MS4 in the Dormant mode can shorten the time for retransmission, that is, the time required to establish a wireless connection can be shortened compared with the mobile station device in the Idle mode, and the effect of the original Dormant mode can be improved, and it is possible to provide Best service ever.

[0212] A retransmission method of the random access channel RACH of the mobile station devices MS1 to MS4 in the Dormant mode and the mobile station devices MS1 to MS4 in the idle mode will be described with reference to the drawings.

[0213] Figure 11 shows the maximum random backoff time for retransmission of the random access channel RACH in idle mode and d...

Embodiment approach 2

[0224] In Embodiment 2, the mobile station apparatuses MS2 to MS4 in the Dormant mode have an average random backoff time shorter than that of the mobile station apparatuses MS2 to MS4 in the Idle mode, and the mobile station apparatuses MS2 to MS4 in the Dormant mode use the retransmission random access channel RACH The selection branches of the chunks are dispersed and wider than those of the mobile station apparatuses MS2 to MS4 in the idle mode. In this way, the collision probability of random access among the mobile station devices MS2 to MS4 in the Dormant mode can be reduced, and the retransmission time for the mobile station devices MS2 to MS4 in the Dormant mode can be shortened. That is, the mobile station devices MS2 to MS4 in the Dormant mode can shorten the time required to establish a wireless connection, improve the effect of the original Dormsnta mode, and provide optimal services.

[0225] A retransmission method of the random access channel RACH of the mobile...

Embodiment approach 3

[0237] In Embodiment 3, the mobile station apparatuses MS1 to MS4 control the maximum random backoff time TDmax in the Dormant mode in accordance with the number of chunks selectable at the time of retransmission of the random access channel RACH.

[0238] The number of chunks and the frequency range that can be selected at the time of retransmission of the random access channel RACH differ depending on the mobile station class or operation mode of the mobile station devices MS1 to MS4.

[0239] The mobile station class indicates the frequency bandwidth that can be transmitted and received at one time in the wireless unit 130 of the mobile station apparatuses MS1 to MS4. Mobile station apparatuses MS1 to MS4 can select chunks through baseband processing of modulation unit 103 or OFDM decoding unit 111 if they are within their frequency bands. the oscillation frequency. This change causes a control delay for changing the setting from the digital part to the analog part, and a ...

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Abstract

A wireless communication system includes a base station device and a mobile station device that tries a random access to the base station device. The mobile station device determines an upper limit of a random backoff time representing an interval from when the random access fails to when another random access is retried based on a relationship between the mobile station device and the base station device.

Description

technical field [0001] The present invention relates to a wireless communication system, a mobile station device, and a random access method, and more particularly, to a wireless communication system, a mobile station device, and a random access method in which mobile stations having different communication bandwidths are mixed and these mobile station devices randomly access . [0002] This application is based on and claims the priority of Japanese Patent Application No. 2006-186802 filed in Japan on July 6, 2006, the contents of which are incorporated herein by reference. Background technique [0003] In 3GPP (3rd Generation Partnership Project), the W-CDMA (Wideband—Code Division Multiplexing Access) system is standardized as a third-generation cellular mobile communication system, and services are sequentially started. In addition, HSDPA (High Speed ​​Downlink Packet Access), which further increases the communication speed, was also standardized and started service. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04W88/02H04L1/00H04L27/26
CPCH04L27/2647H04L27/2608H04W74/0866H04L1/0003H04W74/0833H04L1/0009H04L5/0044
Inventor 中岛大一郎山田升平
Owner SHARP KK
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