Mobile radio communication system, communication apparatus applied in mobile radio communication system, and mobile radio communication method

a mobile radio communication system and communication apparatus technology, applied in multiplex communication, power management, assessment restrictions, etc., can solve the problems of increasing the size of the constitution of the receiver, complicated constitution of the base station and the network, and large so as to reduce the compression ratio and suppress the number of spreading codes of a shorter code length

Inactive Publication Date: 2006-07-13
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] According to the above invention, when the first communication system and second communication system coexist, since the idle period for observing the frequency component of the second communication system is inserted at most in ½ time of one frame duration for composing one superframe of first communication system, at intervals of a specified number of frames, it is not required to observe the frequency component by one observation in one superframe, and the restrictions in frame transmission such as error correction code and spreading factor can be satisfied. Therefore, even when the first communication system and second communication system coexist, the frequency component of the second communication system can be securely observed from the first communication system. Further, deterioration of interleaving performance of the compressed mode frame during such observation can be suppressed.
[0072] According to the above invention, since the compressed frame is generated at a same spreading factor as another frame in which the specified idle period is not inserted at this step, the interference and noise resistant characteristic to the compressed frame is assured.

Problems solved by technology

However, this increases the size of the constitution of the receiver, or makes the constitution complicated.
However, it is necessary to synchronize the mobile device and the base station, whereby the constitution of the base station and the network becomes complicated and large in order to be capable of tracking each dedicated mobile device.
However, in the existing technology, due to restrictions in the error correction code and spreading factor for frame transmission, it is difficult to insert all observation period in one frame, and there are many other problems.

Method used

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  • Mobile radio communication system, communication apparatus applied in mobile radio communication system, and mobile radio communication method
  • Mobile radio communication system, communication apparatus applied in mobile radio communication system, and mobile radio communication method
  • Mobile radio communication system, communication apparatus applied in mobile radio communication system, and mobile radio communication method

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first embodiment

[0102] In the first embodiment, the frequency is observed and detected twice in every one UMTS superframe. Hence, in two UMTS superframes, the frequency is observed and detected four times.

[0103] The observation and detection method is explained by referring to FIG. 7. FIG. 7 is a diagram for explaining the frame transmission of downlink in the first embodiment of the invention. In FIG. 7, the axis of ordinates denotes the transmission rate or transmission power, and the axis of abscissas represents the time. There is a difference of one frame between one FCCH / SCH superframe and two UMTS superframes in the common control channel. In the dedicated traffic channel TACH / F, the position of observation period assigned in one GSM superframe is fixed. Similarly, in the UMTS also the positions of two observation periods assigned in one UMTS superframe in the downlink traffic channel are fixed. Therefore, frequency is observed and detected in specified frames (two positions) of every UMTS su...

second embodiment

[0134] The observation and detection method of the second embodiment is explained below. FIG. 11 is a diagram for explaining the frame transmission of downlink according to the embodiment of the invention. In FIG. 11, the axis of ordinates denotes the transmission rate or transmission power, and the axis of abscissas represents the time. In comparison between one FCCH / SCH superframe and two UMTS superframes in the common control channel, there is a difference of one frame. In the dedicated traffic channel TACH / F, the position of observation period assigned in one GSM superframe is fixed. Similarly in the UMTS, the positions of four observation periods assigned in one UMTS superframe in the downlink traffic channel are fixed. Therefore, the frequency is observed and detected in specified frames (four positions) of every UMTS superframe. Thus, since there is a difference of one frame between one FCCH / SCH superframe and two UMTS superframes, one frame is shifted each in each observatio...

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Abstract

In the mobile radio communication system where the UMTS and an another system coexist an idle slot for observing the frequency component of another system is inserted in one superframe of UMTS. The duration of this idle slot is at most half of the duration of one frame that form the superframe and it is inserted at an interval of a specified number of frames. Therefore, the frequency component of the another system can be observed securely from the UMTS. Further, the deterioration of interleaving performance of the compressed mode frames during such observation can be suppressed.

Description

[0001] A mobile radio communication system, communication apparatus applied in mobile radio communication system, and mobile radio communication method [0002] This application is a continuation of International Application PCT / JP99 / 01051, with an international filing date of Mar. 4, 1999, which designated the United States, the entire contents of which are hereby incorporated by references. TECHNICAL FIELD [0003] The present invention relates to a mobile radio communication system in which UMTS (Universal Mobile Terrestrial communication System) and GSM (Group Specific Mobile) system coexist, communication apparatus applied in mobile radio communication system, and mobile radio communication method. More particularly this invention relates to a technology of observing the control channel of a GSM system that is another system in the mobile radio communication system by making use of an idle period. BACKGROUND ART [0004] In a CDMA cellular system, because the same carrier frequency i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B7/216H04B7/26H04J13/00H04L1/00H04W12/00H04W24/00H04W24/10H04W28/04H04W36/00H04W36/14H04W36/36H04W48/18H04W52/00H04W52/26H04W52/44H04W72/04H04W72/08H04W72/12H04W84/04H04W88/06
CPCH04B7/2634H04B7/2656H04L1/004H04L1/0071H04W24/00H04W24/10H04W28/04H04W36/00H04W36/0088H04W36/14H04W52/267H04W52/44H04W72/08H04W72/12H04W84/04H04W88/06H04W36/0085H04W72/54H04W36/1443
Inventor VOYER, NICOLASYANO, YASUHIROMURAI, HIDESHI
Owner MITSUBISHI ELECTRIC CORP
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