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Mobile station apparatus, base station apparatus, and radio link synchronization determining method

a mobile station and radio link technology, applied in the direction of synchronization arrangement, frequency-division multiplex, instruments, etc., can solve problems such as random access, and achieve the effect of efficient radio link synchronization determination

Inactive Publication Date: 2011-12-01
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020]The present invention enables provision of a mobile station apparatus, a base station apparatus, a program, and a recording medium capable of implementing efficient radio link synchronization determination while receiving a plurality of frequency bands.

Problems solved by technology

The radio link problem is a problem generated in a lower layer (a physical layer problem in a physical layer or a random access problem in a data link layer).
A random access problem is detected by MAC (medium access control) of the data link layer if the number of preamble transmissions reaches the maximum number of transmissions.

Method used

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  • Mobile station apparatus, base station apparatus, and radio link synchronization determining method
  • Mobile station apparatus, base station apparatus, and radio link synchronization determining method
  • Mobile station apparatus, base station apparatus, and radio link synchronization determining method

Examples

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first embodiment

[0068]The first embodiment of the present invention will hereinafter be described.

[0069]In a method described in this embodiment, a mobile station apparatus manages only one downlink synchronization state regardless of the number of received component carriers in relation to the detection of downlink synchronization error.

[0070]FIG. 5 is a block diagram of an example of abase station apparatus according to the first embodiment of the present invention. This base station apparatus 100 comprises of a receiving section 101, a demodulating section 102, a decoding section 103, a higher layer 104, an encoding section 105, a modulating section 106, a reference signal generating section 107, a multiplexing section 108, a transmitting section 109, and a control section 110.

[0071]The higher layer 104 inputs traffic data and a control signal to the encoding section 105 for each component carrier (CC). The encoding section 105 encodes the input data, which is input to the modulating section 106...

second embodiment

[0099]In the method described in the first embodiment, only one downlink synchronization state is managed by the mobile station apparatus 200 regardless of the number of received component carriers in relation to the detection of downlink synchronization error. However, the mobile station apparatus 200 needs to determine the reception quality of all the component carriers being received to determine the downlink synchronization error, and comprehensively evaluate the result. Therefore, with the mobile station apparatus 200 according to a second embodiment, a method of managing the downlink synchronization state based on reception quality of one certain component carrier will be described.

[0100]The base station apparatus 100 used in this embodiment may be the same as FIG. 5. The mobile station apparatus 200 may be the same as FIG. 6. To the correspondence relation between the network configuration and the correlation of frequency bands, the similar relation depicted respectively in F...

third embodiment

[0110]In the method described in the first or second embodiment, only one downlink synchronization state is managed by the mobile station apparatus 200 regardless of the received component carriers in relation to the detection of downlink synchronization error. However, if the propagation characteristics of the component carriers are significantly different, the mobile station apparatus 200 may better control a plurality of downlink synchronization states for respective component carriers. Therefore, in a method described in a third embodiment, the mobile station apparatus 200 manages a downlink synchronization state for each component carrier.

[0111]The base station apparatus 100 used in this embodiment may be the same as FIG. 5. The mobile station apparatus 200 may be the same as FIG. 6. To the correspondence relation between the network configuration and the frequency bands, the same relations depicted in FIGS. 1 and 2 are applicable. The mobile station apparatus 200 manages the s...

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Abstract

While a mobile station apparatus is receiving a plurality of frequency bands, effective determinations of wireless link synchronization can be achieved. The mobile station apparatus measures the reception qualities of a plurality of different downlink frequency band signals (DL_CC1, DL_CC2) transmitted by one or more base station apparatuses and by the foregoing base station apparatuses. If all of the measured reception qualities are below a threshold value (Qout) (threshold value for determining downlink synchronizations), the mobile station apparatus determines that a downlink synchronization error has occurred, and then causes the downlink synchronization state to transition to an error detection part. If the mobile station apparatus successively detects the downlink synchronization error a predetermined number of times, then the mobile station apparatus causes the downlink synchronization state to transition to a synchronization protection part and simultaneously starts a downlink synchronization protection timer. If no downlink synchronization has been recovered by the expiration of the downlink synchronization protection timer, the mobile station apparatus determines that an out-of-downlink-synchronization has occurred, and then releases individually designated radio resources and thereafter starts a cell reselection.

Description

TECHNICAL FIELD[0001]The present invention relates to a mobile station apparatus, a base station apparatus, and a radio link synchronization determining method, and, more particularly, to a radio link synchronization determining method when a plurality of frequency bands are received at the same time.BACKGROUND ART[0002]The standard-setting organization 3GPP (3rd Generation Partnership Project) is discussing Evolved Universal Terrestrial Radio Access (hereinafter, EUTRA) evolved from the third generation mobile communication method and an advanced version thereof, i.e., Advanced EUTRA (also referred to as LTE-Advanced) (Nonpatent Document 1).[0003]In Advanced EUTRA, carrier aggregation is proposed as a technique enabling higher-speed data transmission while maintaining the compatibility with EUTRA (e.g., Nonpatent Documents 2 and 3). The carrier aggregation is a technique for improving a data rate by preparing a receiving apparatus that includes one receiver having a reception bandw...

Claims

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Application Information

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IPC IPC(8): H04W24/00
CPCH04W56/0015H04W56/00H04B7/2678H04B7/2125H04B1/7087H04B1/7085H04W48/20H04W74/085
Inventor UEMURA, KATSUNARIYAMADA, SHOHEIKATO, YASUYUKI
Owner SHARP KK
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