JP2007104590A - Communication terminal device and method of controlling same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication terminal device capable of receiving MBMS data even when the MBMS data overlap a GAP for different-frequency/different-system measurement. <P>SOLUTION: A demodulater 103 outputs demodulated data of a signal received by a radio 102 to an error corrector 104. The error corrector 104 outputs error-free data to an MBMS data section decision part 108. The MBMS data section decision part 108 recognizes a section of the MBMS data reported from a base station device based upon the output of the error corrector 104, and reports it to a GAP control unit 107. The GAP control unit 107 reports transmission timing of the MBMS data to the radio 102 and a reception level measurement part 105. Accordingly, the reception level measurement part 105 does not measure the reception level of a signal of different frequency in reception timing of the MBMS data, and continues to receive the MBMS data being communicated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication terminal apparatus that receives the same data transmitted simultaneously by a plurality of base station apparatuses, and a control method therefor.

  Conventionally, a W-CDMA system is known as a mobile communication system using a code division multiple access (CDMA) system. In the W-CDMA system, it is possible to transmit multimedia data such as images as well as voice. Also, a broadcast / multicast service (Multimedia Broadcast / Multicast Service, hereinafter referred to as “MBMS”) that simultaneously distributes multimedia data to many users has been proposed (for example, non-patent). Reference 1).

  In mobile communication systems, a method of covering a service area with a plurality of base station devices (cell configuration) is used. When cell switching (handoff) is required due to movement of the communication terminal device, the neighboring cells are measured prior to switching, and the switching destination cell is selected based on the measurement result. When a neighboring cell is different from a frequency channel (hereinafter referred to as “own frequency”) used in the current cell (hereinafter referred to as “different frequency”), or a different system such as GSM (hereinafter referred to as “different system”). In this case, it is necessary to perform measurement by switching the frequency channel. In order to perform such measurement of different frequencies or different systems during communication, a technique called a compressed mode is used (for example, see Non-Patent Document 2).

  The operation of MBMS data reception and different frequency / different system measurement in a conventional communication terminal apparatus will be described. FIG. 4 shows a block diagram of a communication terminal apparatus 300 in a conventional communication system. FIG. 5 is a schematic diagram showing a state of measurement in a communication terminal device of transmission data transmitted through the dedicated channel / common channel transmitted from the base station device.

  In FIG. 4, communication terminal apparatus 300 obtains received data via radio section 302, demodulation section 303, and error correction section 304 from the signal received by antenna 301. Data types include individual channel data transmitted individually to each communication terminal apparatus 300 and common channel data transmitted from the base station apparatus to a plurality of communication terminal apparatuses 300. The MBMS data is transmitted through an individual channel or a common channel. However, at present, MBMS data is often transmitted using a common control channel (Secondary Common Control Physical Channel) which is one of the common channels.

On the other hand, for the measurement of different frequency / different system, the position and period (hereinafter referred to as “GAP”) for measuring the different frequency / different system are designated by a base station device (not shown) and designated by the communication terminal device 300. Measurement according to GAP is performed. Specifically, the designation from the base station apparatus is analyzed by the communication control unit 306 and output to the GAP control unit 307. In response to this, the GAP control unit 307 switches and controls the radio unit 302 and the reception level measurement unit 305 according to the GAP specified by the base station apparatus, and performs measurement of the own frequency / different frequency / different system. The dedicated channel signal is transmitted after being compressed according to GAP as shown in FIG. 5 (a), and the communication terminal apparatus can continuously receive data.
3GPP TS 23.246, 22.246, 25.346 3GPP TS 25.212, 25.215

  However, in the conventional communication terminal device, when the MBMS data transmitted on the common channel overlaps with the GAP for different frequency / different system measurement, the measurement in the GAP is prioritized and the MBMS data cannot be received. there were. For example, as shown in FIG. 5C, when there is a GAP for different frequency / different system measurement in the MBMS data section, the MBMS data cannot be received in the GAP section.

  The present invention has been made in view of the above points, and provides a communication terminal device capable of receiving MBMS data even when the MBMS data overlaps with a GAP for different frequency / different system measurement, and a control method thereof The purpose is to do.

  In order to solve this problem, a communication terminal apparatus of the present invention is a communication terminal apparatus that receives MBMS (Multimedia Broadcast / Multicast Service) data in which a plurality of base station apparatuses transmit the same data at the same time. Radio means for receiving signals with different frequencies transmitted by the base station apparatus, reception level measuring means for measuring the reception level of the received signal output from the radio means, and demodulating received data from the signal received by the radio means Receiving data from the received data demodulated by the data receiving means, an MBMS data section judging means for judging a section for receiving MBMS data, and an output of the MBMS data section judging means, and currently communicating The reception is controlled so as not to measure the received signal level of the received signal with a frequency different from the frequency of It adopts a configuration comprising a bell measurement control means.

  The communication terminal apparatus control method according to the present invention is a communication terminal apparatus control method for receiving MBMS data in which a plurality of base station apparatuses transmit the same data at the same time. A radio step for receiving different signals; a reception level measurement step for measuring a reception level of a reception signal output by the radio step; a data reception step for demodulating reception data from the signal received in the radio step; and the data An MBMS data interval determination step for determining an interval in which MBMS data is received from the received data demodulated in the reception step, and reception of a frequency different from the frequency currently being communicated upon receiving outputs of the MBMS data interval determination step. A reception level measurement control step for controlling not to perform reception signal level measurement of the signal; A configuration that includes.

  According to the present invention, when MBMS data overlaps with a GAP for different frequency / different system measurement, it is possible to receive MBMS data by providing means for controlling not to perform measurement with GAP. A communication terminal apparatus having an effect can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
Hereinafter, a communication terminal device and a communication system according to embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of communication terminal apparatus 100 according to Embodiment 1 of the present invention. Communication terminal apparatus 100 according to Embodiment 1 includes antenna 101, radio section 102, demodulation section 103, error correction section 104, reception level measurement section 105, communication control section 106, and GAP control section 107. The MBMS data section determination unit 108 is mainly configured. Communication terminal apparatus 100 also includes an upper layer unit that receives received data, but this is not shown.

  The antenna 101 receives a transmission signal from a base station apparatus (not shown) and outputs it to the radio unit 102. Radio section 102 outputs a baseband signal obtained by processing the received signal to demodulation section 103 and reception level measurement section 105. Demodulation section 103 demodulates the input baseband signal and outputs demodulated data as a processing result to error correction section 104. The error correction unit 104 constitutes a data reception unit together with the demodulation unit 103, determines whether or not there is an error in the demodulated data output from the demodulation unit 103, and the communication control unit 106 uses the error-free data and correctable and corrected data as reception data. Then, the data is output to the MBMS data section determination unit 108 and an upper layer device (not shown).

  The communication control unit 106 performs location registration of the communication terminal device 100, radio channel control such as outgoing / incoming calls, handover, etc., call processing, etc., and notifies the GAP control unit 107 of information (position and section) related to GAP. The MBMS data section determination unit 108 extracts information on the MBMS data section notified / transmitted from the base station apparatus from the received data output from the error correction unit 104 and notifies the GAP control unit 107 of the information.

  The GAP control unit 107 receives the information (position and section) related to the GAP notified from the communication control unit 106 and the information related to the MBMS data section notified from the MBMS data section determination unit 108, and receives the radio unit 102 and the reception level measurement. The unit 105 is controlled. That is, the GAP control unit 107 issues an instruction to switch the frequency to the radio unit 102 when measuring different frequencies / different systems during the GAP, and the reception level measuring unit 105 from the own frequency to the different frequency. / Notify switching to a different system. The reception level measurement unit 105 accumulates the measurement result of the own frequency or different frequency / different system for each frequency or cell according to the notified switching information. The frequency and the measurement result for each cell in the reception level measurement unit 105 are notified to the communication control unit 106, and are used as a judgment material for radio channel control such as cell switching and handover. Further, the GAP control unit 107 prevents the measurement of the different frequency / different system and performs the measurement of the GAP timing and the MBMS data when the GAP timing and the MBMS data section overlap according to the information on the MBMS data section described above. If the sections of do not overlap, measure different frequencies / systems. Accordingly, the reception level measurement unit 105 does not measure the reception levels of signals of different frequencies at the MBMS data reception timing, and continues to receive the MBMS data currently being communicated.

  The operation of communication terminal apparatus 100 configured as described above will be described.

  The MBMS data section determination unit 108 recognizes the section of MBMS data notified / transmitted from the base station apparatus and notifies the GAP control unit 107 of it. When the GAP control unit 107 is notified that it is a section of MBMS data, the reception level measurement unit 105 continues measurement of its own frequency without giving a measurement instruction of a different frequency / different system in the designated GAP. To do. When it is not the section of MBMS data, the reception level measurement unit 105 performs measurement of different frequencies / different systems in the specified GAP. For example, when there is a GAP for different frequency / different system measurement in the section of MBMS data as shown in FIG. 2 (a), FIG. 2 (b), and FIG. 2 (d), measurement in GAP is not performed. Continue measuring your own frequency. This state is indicated by INT in FIG. As is apparent from the operation of communication terminal apparatus 100 in this INT compared with the conventional case shown in FIG. 5C, according to the present embodiment, the reception level measurement of different frequencies / different systems associated with GAP is performed. Thus, the communication terminal apparatus 100 can normally receive the MBMS data.

  As described above, according to the first embodiment, in the case of the MBMS data section, the different frequency / differential in the GAP designated by the base station apparatus is obtained by the cooperation of the MBMS data section determination unit 108 and the GAP control unit 107. MBMS data can be received without error by controlling so as not to perform measurement of the system. Thereby, in Embodiment 1, it is possible to prevent the MBMS data from being lost more than necessary.

  In the first embodiment, in the MBMS data section, the measurement of different frequencies / different systems is not performed unconditionally. However, within a range in which necessary measurement performance can be maintained by weighting certain conditions. It can also be controlled not to perform the measurement. There is a measurement level of the own frequency as a constant condition for weighting. If the measurement level of the own frequency is higher than a predetermined threshold, it is judged that measurement of different frequency / different system is not necessary, and measurement is not performed. It can also be done. Further, when the measurement level of the different frequency / different system is lower than a predetermined threshold, it can be determined that the measurement of the different frequency / different system is not necessary, and the measurement is not performed.

  In addition, it is possible to prevent the measurement from being performed only when the error correction capability of MBMS data is low and it is determined that the data cannot be received by the measurement of different frequency / different system. As described above, in implementing the present invention, the communication terminal apparatus 100 can be controlled not to measure different frequencies / different systems after incorporating various conditions of the communication system.

  In addition, when MBMS data is transmitted from a plurality of cells and is selectively combined on the terminal side, if one MBMS data overlaps with GAP and the other MBMS data does not overlap with GAP, specify It is also possible to perform different frequency / different system measurements in the GAP. In this case, there is a high possibility that MBMS data from the other side can be acquired correctly, and therefore, measurement of different frequencies / different systems is performed to prioritize cell environment measurement.

  As described above, when implementing the present invention, it is possible to control the acquisition of MBMS data and the grasp of the communication environment by measuring the reception level in a balanced manner.

(Embodiment 2)
FIG. 3 shows a block diagram of a communication terminal apparatus according to Embodiment 2 of the present invention. 3, blocks having the same functions as those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted. The communication terminal apparatus 200 according to Embodiment 2 is characterized in that a transmission unit 209 is added as shown in FIG. The transmission unit 209 is provided to notify the base station apparatus that the measurement of the different frequency / different system is not performed, as indicated by INT in FIG.

  The operation of the communication terminal apparatus and communication system configured as described above will be described.

  Communication terminal apparatus 200 notifies base station apparatus via transmitter 209 and antenna 101 that the measurement of the different frequency / different system has not been performed. The base station apparatus determines the position and length of the GAP section according to the measurement status of the different frequency / different system notified from the communication terminal apparatus 200 and notifies the communication terminal apparatus 200 of it.

  The communication terminal apparatus 200 performs measurement of different frequencies / different systems in the designated GAP section. For example, as shown in FIGS. 2 (a), (b), and (d), when there is a GAP for different frequency / different system measurement in the section of MBMS data, the GAP is not measured and the own frequency is measured. To continue. Thereby, MBMS data can be received normally. Further, the communication terminal apparatus 200 notifies the base station apparatus that the measurement of the different frequency / different system is not performed, so that the base station apparatus can maintain the measurement performance of the different frequency / different system in the communication terminal apparatus 200. In addition, control such as increasing the frequency and density of GAP is performed.

  In the above description, the position and length of the GAP section are determined by the base station apparatus. However, the communication terminal apparatus 200 may request the position and length of the GAP section. When making this request, the communication terminal apparatus 200 may request a period desired as a GAP, or conversely, request a period not desired as a GAP. In addition, in order for the base station device to grasp the measurement status of the different frequency / different system of the communication terminal device 200, the number of times that the measurement of the different frequency / different system was not performed from the communication terminal device 200 to the base station device. The transmission unit 209 may be provided with a number storage unit 210 that counts and stores the number of times, and the number value stored in the number storage unit 210 may be used for reporting.

  The communication terminal apparatus 200 notifies the base station apparatus of the type and priority of the MBMS data currently being received, and the base station apparatus determines the GAP section according to the notified schedule and priority of the type of MBMS data. May be determined based on comprehensive information such as the communication environment of the entire cell and the reception level of the communication terminal device 200.

  As described above, according to the second embodiment, when the GAP measurement is not performed unlike the designation from the base station apparatus, the communication terminal apparatus 200 transmits various information including the fact to the base station apparatus. Therefore, the base station apparatus can comprehensively grasp the communication environment of the communication terminal apparatus 200. Therefore, the base station apparatus can also adaptively control the GAP, and according to Embodiment 2, it is possible to achieve both high communication reliability and high-efficiency transmission of MBMS data.

  As described above, the present invention controls the measurement by the GAP when the MBMS data transmitted on the common channel overlaps with the GAP for different frequency / different system measurement, and has high communication reliability and high efficiency of the MBMS data. It has the effect of being able to receive MBMS data while being compatible with transmission, and is useful as a communication terminal device.

The block diagram of the communication terminal device which concerns on Embodiment 1 of this invention Schematic diagram showing a state of measurement of transmission data transmitted from the base station apparatus according to Embodiment 1 of the present invention Block diagram of a communication terminal apparatus according to Embodiment 2 of the present invention Block diagram of a conventional communication terminal device The schematic diagram which shows the mode of the measurement of the transmission data transmitted from the base station apparatus in a prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 100, 200 Communication terminal device 101 Antenna 102 Radio | wireless part 103 Demodulation part 104 Error correction part 105 Reception level measurement part 106 Communication control part 107 GAP control part 108 MBMS data section determination part 209 Transmission part 210 Count storage part

Claims (4)

A communication terminal apparatus that receives MBMS (Multimedia Broadcast / Multicast Service) data in which a plurality of base station apparatuses transmit the same data at the same time,
Radio means for receiving signals transmitted from a plurality of base station apparatuses having different frequencies from each other;
Reception level measuring means for measuring a reception level of a signal received by the wireless means;
Data receiving means for demodulating received data from the signal received by the wireless means;
MBMS data section determining means for determining whether or not it is a section for receiving MBMS data from the received data demodulated by the data receiving means;
A reception level measurement control unit that receives the determination result of the MBMS data section determination unit and performs control so as not to perform reception level measurement of a received signal having a frequency different from the frequency currently being communicated;
A communication terminal device comprising:   When there is a control in the reception level measurement control means so as not to perform reception signal level measurement of a received signal having a frequency different from the frequency currently being communicated with, there is a transmission means for transmitting the fact to the base station apparatus. The communication terminal device according to claim 1.   The reception level measurement control means includes a reception level measurement control number storage means for storing a control number so as not to perform reception level measurement of a received signal having a frequency different from the frequency currently being communicated, and the transmission means The communication terminal device according to claim 2, wherein the number of times of control is transmitted. A control method for a communication terminal apparatus for receiving MBMS data in which a plurality of base station apparatuses transmit the same data simultaneously,
A radio step of receiving signals having different frequencies transmitted by a plurality of base station devices;
A reception level measurement step of measuring a reception level of a reception signal output by the wireless step;
A data receiving step of demodulating received data from the signal received in the wireless step;
An MBMS data section determining step for determining a section for receiving MBMS data from the received data output by the data receiving step;
A reception level measurement control step for receiving the output of the MBMS data section determination step and controlling so as not to perform reception signal level measurement of a reception signal having a frequency different from the frequency currently being communicated;
A control method for a communication terminal apparatus comprising:

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