JP2007088588A - Wireless communication apparatus and mobile communication terminal provided with same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the power consumption of a mobile communication terminal under a multipath environment. <P>SOLUTION: The wireless communication apparatus includes: a delay profile generating means 32 for generating a delay profile; an extract means 33 for extracting candidates of effective paths on the basis of the delay profile; a reception power measurement means 34 for measuring reception power; and a discrimination means 35 for discriminating whether or not the reception power is a threshold value or over. An effective path setting means 36 places a limit on the number of effective paths to be a prescribed number even when the number of paths extracted by the extract means 33 exceeds the prescribed number if the discrimination means discriminates that the reception power is the threshold value or over. Thus, the wireless communication apparatus can reduce the power consumption of the mobile communication terminal under the multipath environment. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wireless communication device, a mobile communication terminal device including the wireless communication device, an effective path setting method in wireless communication, and a program thereof.

  Rake reception in which signals of a plurality of paths (multipath) corresponding to one scrambling code are combined is often applied to a reception operation in a mobile communication terminal apparatus of Code Division Multiple Access (CDMA).

  In the multipath, the reception level includes a level to be used for rake reception and a level not to be used for rake reception. Therefore, it is necessary to select a path (effective path) to be used for rake reception.

  Conventionally, a delay profile is used to select an effective path used for combining in rake reception.

  The delay profile is, for example, as shown in FIG. 3, and the vertical axis represents the reception level and the horizontal axis represents the delay time.

Conventionally, for example, among the paths indicated in the delay profile, the path (in FIG. 3, the path b in the example of FIG. 3) has a ratio of the received level that is equal to or higher than a predetermined value (eg, 50%) In the example, the paths a, b, c, d, e, f, and g) are selected as effective paths. That is, conventionally, the effective path is selected based only on the maximum peak ratio of the delay profile (see, for example, Patent Document 1).
JP 2003-60558 A

  Conventionally, since effective paths are selected based only on the maximum peak ratio of the delay profile, there are the following problems (1) and (2).

  (1) Even under a high reception level environment where a large number of effective paths are not required, a large number of paths are set and current is excessively consumed.

  (2) Even in a low reception level environment where there are almost no effective paths, a large number of paths are set up, causing an error in field strength (SIR) measurement, and consuming unnecessary current. There was a problem that.

  The present invention has been made to solve the above-described problems, and includes a wireless communication apparatus capable of reducing power consumption of a mobile communication terminal apparatus in a multipath environment, and the wireless communication apparatus. An object of the present invention is to provide a mobile communication terminal device, a method for setting an effective path in wireless communication, and a program therefor.

  In order to solve the above problems, a wireless communication apparatus according to the present invention includes delay profile creation means for creating delay profiles of a plurality of paths corresponding to one scrambling code, and delay profiles created by the delay profile creation means. Based on extraction means for extracting a candidate path of an effective path corresponding to the one scrambling code, received power measurement means for measuring the received power corresponding to the one scrambling code, and the received power measurement First determination means for determining whether or not the received power measured by the means is equal to or greater than a first threshold; and only the path extracted by the extraction means is an effective path corresponding to the one scrambling code. Effective path setting means for setting the effective path setting means as the first determination means. If it is determined that the received power is greater than or equal to the first threshold, the number of the effective paths is set to the first number even if the number of paths extracted by the extraction unit exceeds a first predetermined number. It is characterized by being limited to a predetermined number.

  In the wireless communication apparatus of the present invention, second determination means for determining whether or not the reception power measured by the reception power measurement means is less than a second threshold (first threshold> second threshold). And the effective path setting means determines that the number of paths extracted by the extracting means is the first when the second determining means determines that the received power is less than the second threshold. Even if the predetermined number of 2 is exceeded, it is preferable to limit the number of the effective paths to the second predetermined number.

  Further, the wireless communication apparatus of the present invention is configured to generate delay profiles for a plurality of paths corresponding to one scrambling code, based on the delay profile created by the delay profile creation means, based on the delay profile created by the delay profile creation means. An extraction means for extracting a path that is a candidate for an effective path corresponding to the scrambling code, a received power measuring means for measuring the received power corresponding to the one scrambling code, and the received power measuring means. A second determination unit that determines whether or not received power is less than a second threshold; and an effective path that sets only the path extracted by the extraction unit as an effective path corresponding to the one scrambling code. Setting means, wherein the effective path setting means determines the received power by the second determination means. If the number of paths extracted by the extraction means exceeds the second predetermined number, the number of valid paths is limited to the second predetermined number. It is characterized by that.

  In the wireless communication apparatus of the present invention, it is preferable that the first determination unit determines whether CPICH_RSCP measured by the received power measurement unit is equal to or greater than the first threshold.

  In the wireless communication apparatus of the present invention, the first threshold value may be a value such that the communication quality satisfies a predetermined standard even if rake reception is not performed if the received power is equal to or higher than the first threshold value. preferable.

In the wireless communication apparatus of the present invention, it is preferable that the second determination unit determines whether CPICH_Ec / N ₀ measured by the reception power measurement unit is less than the second threshold value.

  In the wireless communication apparatus of the present invention, it is preferable that the second threshold value is a value such that an effective path cannot be detected when the received power is less than the second threshold value.

  In the wireless communication apparatus according to the present invention, the extracting unit selects a path having a ratio of a reception level with respect to a path having a maximum reception level, which is greater than or equal to a predetermined value, from the paths for which the delay profile is generated by the delay profile generation unit. It is preferable to extract as a path candidate.

  In the wireless communication apparatus of the present invention, it is preferable that the effective path setting unit preferentially selects an effective path from a path with a higher reception level among paths extracted by the extracting unit.

  Moreover, the mobile communication terminal device of the present invention is characterized by comprising the wireless communication device of the present invention.

  The mobile communication terminal device of the present invention is preferably a mobile phone, for example.

  The effective path setting method of the present invention is a method for setting an effective path in wireless communication, in a first step of creating delay profiles of a plurality of paths corresponding to one scrambling code, and to the delay profile. Based on a second step of extracting a candidate path of an effective path corresponding to the one scrambling code, a third step of measuring received power corresponding to the one scrambling code, and the second step. A fourth step of determining whether or not the received power measured in the step 3 is equal to or greater than a first threshold, and only the path extracted by the second step is used as the one scrambling code. A fifth step of setting as a corresponding effective path, and when the received power is determined to be greater than or equal to the first threshold in the fourth step, the fifth step The extent, the number of paths extracted by the second process even exceeds the first predetermined number, it is characterized in that to limit the number of the valid paths to a predetermined number of the first.

  In the effective path setting method of the present invention, a sixth method for determining whether or not the received power measured in the third step is less than a second threshold value (first threshold value> second threshold value). And when the received power is determined to be less than the second threshold value in the sixth step, the fifth step is extracted in the second step. Even if the number of paths exceeds the second predetermined number, it is preferable to limit the number of effective paths to the second predetermined number.

  The effective path setting method of the present invention is a method for setting an effective path in wireless communication, in a first step of creating delay profiles of a plurality of paths corresponding to one scrambling code, and to the delay profile. Based on a second step of extracting a candidate path of an effective path corresponding to the one scrambling code, a third step of measuring received power corresponding to the one scrambling code, and the second step. A sixth process for determining whether or not the received power measured in the process 3 is less than a second threshold, and only the path extracted in the second process is used as the one scrambling code. A fifth step of setting as a corresponding effective path, and when the received power is determined to be less than the second threshold in the sixth step, the fifth step The extent, the number of paths extracted by the second process even exceeds the second predetermined number, the number of the effective paths is characterized in that to limit to a predetermined number of the second.

  In the effective path setting method of the present invention, in the fourth step, it is preferable to determine whether or not CPICH_RSCP measured in the third step is equal to or greater than the first threshold.

  In the effective path setting method of the present invention, the first threshold value is a value such that the communication quality satisfies a predetermined criterion even if rake reception is not performed if the received power is equal to or higher than the first threshold value. It is preferable.

In the effective path setting method of the present invention, in the sixth step, it is preferable to determine whether or not CPICH_Ec / N ₀ measured in the third step is less than the second threshold value. .

  In the effective path setting method of the present invention, it is preferable that the second threshold is a value such that an effective path cannot be detected when the received power is less than the second threshold.

  In the effective path setting method according to the present invention, in the second step, a path having a reception level ratio with respect to a path having a maximum reception level among the paths in which the delay profile is created is determined to be the effective path. It is preferable to extract as candidates.

  In the effective path setting method of the present invention, in the fifth process, it is preferable that the effective path is preferentially selected from the paths extracted in the second process having a high reception level.

  According to the present invention, when it is determined that the received power is equal to or greater than the first threshold, the number of effective paths is obtained even if the number of paths extracted based on the delay profile exceeds the first predetermined number. Is limited to the first predetermined number, for example, in a high reception level environment where the communication quality satisfies a predetermined standard without rake reception, the operation of the wireless communication apparatus can be minimized. It is possible to reduce power consumption of the wireless communication device.

  Further, according to the present invention, when it is determined that the received power is less than the second threshold, even if the number of paths extracted based on the delay profile exceeds the second predetermined number, the effective path Is limited to the second predetermined number, for example, in a low reception level environment where an effective path cannot be detected, the operation of the wireless communication device can be minimized, and the wireless communication device Power consumption can be reduced.

  Embodiments according to the present invention will be described below with reference to the drawings.

[First Embodiment]
In the first embodiment, an example will be described in which the power consumption is reduced by reducing the number of effective paths in an environment where the reception power of the common channel is large and there is no need to rake combine many paths.

  FIG. 1 is a block diagram showing the configuration of the mobile phone 100 according to the first embodiment.

  As shown in FIG. 1, the mobile phone 100 according to the first embodiment includes a display unit that includes a plurality of operation keys and is operated by a user, for example, and a liquid crystal display device that performs various display operations. Unit 12, wireless unit 13 that performs wireless communication, sound generation unit (speaker) 14 that performs sound generation operation, reception unit (microphone) 15 that performs reception operation, control unit 16 that performs various control operations, and the mobile And a power source unit 17 that is a power source of the telephone 100.

  The control unit 16 includes, for example, a CPU that performs various control operations including operation control of the display unit 12, the radio unit 13, the sound generation unit 14, a ROM that stores various control programs executed by the CPU, and a CPU. And a RAM functioning as a work area. The operation of the control unit 16 is performed according to a control program stored in the ROM.

  The power supply unit 17 is a rechargeable secondary battery such as a battery pack, and supplies power to the control unit 16. The control unit 16 supplies the power supplied from the power supply unit 17 to the display unit 12, the radio unit 13, the sound generation unit 14, and the like.

  The wireless unit 13 performs wireless communication by a CDMA (Code Division Multiple Access) method.

  The wireless unit 13 includes an antenna (not shown), and transmits / receives a wireless signal to / from the outside (for example, a wireless base station) using the antenna.

  As illustrated in FIG. 1, the wireless unit 13 includes a receiving unit 21 that performs a wireless signal receiving operation and a transmitting unit 22 that performs a wireless signal transmitting operation.

  Among these, the receiving unit 21 demodulates the received radio signal and inputs it to the control unit 16.

  Based on the signal from the receiving unit 21 of the wireless unit 13, the control unit 16 causes the sounding unit 14 to perform a sounding operation (such as a sounding operation of the other party's voice during a call) or the display unit 12. Display operation (such as a display operation indicating that a call is in progress).

  The transmission unit 22 also modulates the audio signal from the control unit 16 (generated based on the audio input from the receiver unit 15) and the control signal from the control unit 16 into a radio signal, and converts the radio signal to the antenna. Send to the outside more.

  The mobile phone 100 can execute communication functions such as a call, transmission / reception of e-mail, and Internet connection by performing wireless communication by the wireless unit 13 in this manner.

  FIG. 2 is a block diagram illustrating a main configuration of the receiving unit 21 of the wireless unit 13.

  As shown in FIG. 2, the reception unit 21 creates a scrambling code identification unit 31 that identifies a scrambling code, and a delay profile of a plurality of paths corresponding to the scrambling code identified by the scrambling code identification unit 31. A delay profile creation unit 32 that performs the search, a valid path candidate extraction unit 33 that extracts a valid path candidate based on the delay profile created by the delay profile creation unit 33, and a scrambling code identified by the scrambling code identification unit 31. A received power measuring unit 34 that measures received power corresponding to the received power, a received power determining unit 35 that determines whether the received power measured by the received power measuring unit 34 is equal to or greater than a first threshold, and a scrambling code. Corresponding to the scrambling code identified by the identification unit 31 Includes a valid path setting unit 36 that sets the effective path, the.

  Further, the receiving unit 21 synthesizes a signal of a path set as an effective path by the effective path setting unit 36 (not shown), and a decoding unit (not shown) that decodes a signal synthesized by the rake combining unit. Abbreviation).

  Next, the operation of the receiving unit 21 will be described.

  FIG. 5 is a flowchart showing an operation flow of the receiving unit 21.

  The receiving unit 21 performs the operation described below by program control.

  First, the scrambling code identification unit 31 identifies the scrambling code, and outputs that fact to the reception power measurement unit 34 and the delay profile creation unit 32.

  The delay profile creation unit 32 creates a delay profile of a plurality of paths corresponding to the scrambling code identified by the scrambling code identification unit 31 and outputs the delay profile to the valid path candidate extraction unit 33.

  FIG. 3 is a diagram illustrating an example of a delay profile created by the delay profile creation unit 32.

  In FIG. 3, the vertical axis represents the reception level of each path, and the horizontal axis represents the delay time of each path.

  The valid path candidate extraction unit 33 extracts valid path candidates based on the delay profile created by the delay profile creation unit 32, and outputs the extraction result to the valid path setting unit 36.

  More specifically, the valid path candidate extraction unit 33 extracts, for example, a path having a ratio of a reception level with respect to a path with the maximum reception level that is greater than or equal to a predetermined value from among the paths for which a delay profile has been created, as a candidate for a valid path To do.

  That is, in the example of FIG. 3, the path having the maximum reception level is the path b, but the reception level of the path b is 100%, and the ratio of the reception level to the reception level is a predetermined value or more. Extracts only paths with a reception level ratio of 50% or more, for example, as valid path candidates.

  In the example of FIG. 3, a total of seven paths a, b, c, d, e, f, and g are extracted as valid paths.

  The received power measuring unit 34 measures the received power of a common pilot channel (CPICH) corresponding to the scrambling code identified by the scrambling code identifying unit 31, and the measurement result is used as the received power determining unit. (Step S1 in FIG. 5).

  In the case of the present embodiment, the received power measurement unit 34 measures, for example, channel signal strength (CPICH_RSCP: Common Pilot Channel_Received Signal Code Power) as received power.

  The reception power determination unit 35 determines whether or not the reception power measured by the reception power measurement unit 34 is greater than or equal to a first threshold (specifically, for example, −80 dB) (step S2 in FIG. 5). The determination result is output to the effective path setting unit 36.

  Here, if the received power is equal to or higher than the first threshold, the first threshold satisfies the predetermined standard even if rake reception is not performed (for example, communication is not interrupted or noise is difficult to enter). On the other hand, when the received power is less than the first threshold, the rake reception is effective.

  The effective path setting unit 36 sets an effective path (path used for rake combining) based on the determination result by the received power determination unit 35 and the extraction result of the effective path candidate by the effective path candidate extraction unit 33. To do.

  FIG. 4 is a diagram showing the relationship between received power and the maximum number of effective paths.

  When the received power measured by the received power measuring unit 34 is equal to or higher than a first threshold (for example, −80 dB) (Yes in step S2 in FIG. 5), the received signal can be decoded without performing rake reception. Considering the signal strength, that is, assuming that the communication quality satisfies a predetermined standard even if rake reception is not performed, the effective path setting unit 36 sets the maximum number of effective paths to, for example, “3 ( First predetermined number) ”(step S4 in FIG. 5).

  That is, when the number of valid path candidates is seven as shown in FIG. 3, only three paths are set as actual valid paths.

  Here, the effective path setting unit 36 preferentially selects the effective path candidates extracted by the effective path candidate extraction unit 33 from the ones having a high reception level indicated by the delay profile created by the delay profile creation unit 32, Set as a valid path.

  Therefore, in the example of FIG. 3, the valid path setting unit 36 sets paths a, b, and c with high reception levels as valid paths.

  On the other hand, when the received power measured by the received power measuring unit 34 is less than a first threshold (for example, −80 dB) (No in step S2 in FIG. 5), the rake reception is regarded as an effective environment, The valid path setting unit 36 sets the maximum number of valid paths to the maximum number that can be set by the valid path setting unit 36 (for example, “7” as shown in FIG. 4) (step S3 in FIG. 5).

  That is, when the number of valid path candidates is seven as shown in FIG. 3, all these paths are set as actual valid paths.

  According to the first embodiment as described above, when it is determined that the received power is equal to or higher than the first threshold value, the communication quality is a high reception level that satisfies a predetermined standard without performing rake reception. Even if the number of paths extracted as valid path candidates based on the delay profile exceeds “3 (first predetermined number)”, the number of effective paths is set to “3 (first predetermined number). Therefore, the operation of the receiving unit 21 can be suppressed to the minimum necessary, and the power consumption of the receiving unit 21 can be reduced.

  In the first embodiment, the example in which only one value is used as the threshold value has been described. However, the maximum number of effective paths may be changed step by step using a plurality of threshold values. FIG. 6 is a diagram for explaining an example using two threshold values, for example. In this case, for example, when the received power is greater than or equal to the 1-A threshold value (for example, −70 dB), the effective path setting unit assumes that the communication quality satisfies a predetermined standard without performing rake reception. 36 limits the maximum number of effective paths to, for example, “2”. When the received power is less than the 1-A threshold (for example, −70 dB) and greater than the 1-B threshold (for example, −80 dB), the maximum number of effective paths is slightly increased to “4”, for example. To do. When the received power is less than the 1-B threshold (for example, −80 dB), the effective path setting unit 36 sets the maximum number of effective paths to “7”, for example, assuming that the rake reception is effective. To do.

[Second Embodiment]
In the second embodiment, an example will be described in which power consumption is reduced by reducing the number of effective paths in an environment where the reception power of the common channel is small and an effective path cannot be detected.

  Since the second embodiment is the same as the first embodiment except that the operation of the receiving unit 21 is different, only the differences will be described below.

  FIG. 7 is a diagram showing the relationship between the received power and the maximum number of effective paths in the case of the second embodiment, and FIG. 8 is a flowchart showing the operation flow of the receiving unit 21 in the case of the second embodiment.

In the case of the second embodiment, the reception power measurement unit 34 measures, for example, CPICH_Ec / N ₀ as the reception power (step S11 in FIG. 8).

  The reception power determination unit 35 determines whether or not the reception power measured by the reception power measurement unit 34 is less than a second threshold (specifically, for example, −95 dB) (step S12 in FIG. 8). The determination result is output to the effective path setting unit 36.

  Here, the second threshold is a value such that an effective path cannot be detected when the received power is less than the second threshold.

  In the case of the present embodiment, when the received power measured by the received power measuring unit 34 is less than the second threshold (for example, −95 dB) (Yes in step S12 in FIG. 8), the extent that the effective path cannot be detected. As shown in FIG. 7, the effective path setting unit 36 limits the maximum number of effective paths to, for example, “2 (second predetermined number)” (step S14 in FIG. 8).

  That is, when the number of valid path candidates is seven as shown in FIG. 3, only three paths (for example, paths a, b, and c with high reception levels in this embodiment) are included. Set as the actual effective path.

  On the other hand, when the received power measured by the received power measuring unit 34 is equal to or greater than the second threshold (for example, −95 dB) (No in step S12 in FIG. 8), the rake reception is regarded as an effective environment, The valid path setting unit 36 sets the maximum number of valid paths to the maximum number that can be set by the valid path setting unit 36 (for example, “7” as shown in FIG. 8) (step S3 in FIG. 8).

  That is, when the number of valid path candidates is seven as shown in FIG. 3, all these paths are set as actual valid paths.

  According to the second embodiment as described above, when it is determined that the received power is less than the second threshold, it is assumed that the environment is in a low reception level such that an effective path cannot be detected, Even if the number of paths extracted as valid path candidates based on the delay profile exceeds “2 (second predetermined number)”, the number of effective paths is limited to “2 (second predetermined number)”. In addition, it is possible to prevent an increase in measurement error of the signal reception intensity, to suppress the operation of the receiving unit 21 to a necessary minimum, and to reduce power consumption of the receiving unit 21.

  In the second embodiment, the example in which only one value is used as the threshold value has been described. However, the maximum number of effective paths may be changed step by step using a plurality of threshold values. FIG. 9 is a diagram for explaining an example using two threshold values, for example. In this case, for example, when the received power is equal to or greater than the 2-A threshold (for example, −90 dB), the effective path setting unit 36 regards the maximum number of effective paths as “ 7 ”. When the received power is less than the 2-A threshold (for example, −90 dB) and greater than the 2-B threshold (for example, −95 dB), the maximum number of effective paths is slightly reduced to “4”, for example. To do. If the received power is less than the 2-B threshold (for example, −95 dB), the effective path setting unit 36 determines that the effective path is in a low level environment where the effective path cannot be detected, For example, the number of passes is limited to “2”.

  In the first embodiment described above, an example in which the power consumption is reduced by reducing the number of effective paths in an environment where a large number of paths need not be rake-combined because the common channel reception power is large. In the second embodiment described above, examples of reducing power consumption by reducing the number of effective paths in an environment where an effective path cannot be detected because the reception power of the common channel is small have been described. However, the present invention is not limited to this example, and may be configured as a combination of the configuration of the first embodiment and the configuration of the second embodiment.

  Further, in each of the above-described embodiments, only the mobile phone 100 is illustrated as an example of the mobile communication terminal device. However, the present invention is not limited to this example. For example, the present invention is applied to a PHS, PDA, or other mobile communication terminal device. The same applies.

It is a block diagram which shows the structure of the mobile telephone which concerns on embodiment of this invention. FIG. 2 is a block diagram illustrating a configuration of a receiving unit included in a wireless unit of the mobile phone in FIG. 1. It is a figure which shows an example of a delay profile. It is a figure which shows the correspondence of received power and the maximum number of effective paths in the case of 1st Embodiment. It is a flowchart which shows the flow of operation | movement by the receiving part in the case of 1st Embodiment. It is a figure which shows the other example of the correspondence of the received power and the maximum number of effective paths in the case of 1st Embodiment. It is a figure which shows the correspondence of received power and the maximum number of effective paths in the case of 2nd Embodiment. It is a flowchart which shows the flow of operation | movement by the receiving part in the case of 2nd Embodiment. It is a figure which shows the other example of the correspondence of received power and the maximum number of effective paths in the case of 2nd Embodiment.

Explanation of symbols

32 Delay profile creation unit (delay profile creation means)
33 Valid path candidate extraction unit (extraction means)
34 Received power measuring unit (received power measuring means)
35 Received power determination unit (first determination means, second determination means)
36 Effective path setting part (effective path setting means)
100 Mobile phone (mobile communication terminal)

Claims (21)

Delay profile creating means for creating delay profiles of a plurality of paths corresponding to one scrambling code;
Extraction means for extracting a path as a valid path candidate corresponding to the one scrambling code based on the delay profile created by the delay profile creation means;
Received power measuring means for measuring received power corresponding to the one scrambling code;
First determination means for determining whether or not the reception power measured by the reception power measurement means is greater than or equal to a first threshold;
Effective path setting means for setting only the path extracted by the extracting means as an effective path corresponding to the one scrambling code;
With
The effective path setting means determines that the number of paths extracted by the extracting means is a first predetermined number when the received power is determined to be greater than or equal to the first threshold by the first determining means. Even if the number exceeds, the number of the effective paths is limited to the first predetermined number. A second determining means for determining whether or not the received power measured by the received power measuring means is less than a second threshold (first threshold> second threshold);
In the effective path setting means, when the second determination means determines that the received power is less than the second threshold, the number of paths extracted by the extraction means is a second predetermined number. 2. The wireless communication apparatus according to claim 1, wherein the number of the effective paths is limited to the second predetermined number even if the number of effective paths is exceeded. Delay profile creating means for creating delay profiles of a plurality of paths corresponding to one scrambling code;
Extraction means for extracting a path as a valid path candidate corresponding to the one scrambling code based on the delay profile created by the delay profile creation means;
Received power measuring means for measuring received power corresponding to the one scrambling code;
Second determining means for determining whether or not the received power measured by the received power measuring means is less than a second threshold;
Effective path setting means for setting only the path extracted by the extracting means as an effective path corresponding to the one scrambling code;
With
In the effective path setting means, when the second determination means determines that the received power is less than the second threshold, the number of paths extracted by the extraction means is a second predetermined number. Even if the number exceeds, the number of the effective paths is limited to the second predetermined number.   The wireless communication apparatus according to claim 1, wherein the first determination unit determines whether CPICH_RSCP measured by the received power measurement unit is equal to or greater than the first threshold.   The first threshold value is a value such that the communication quality satisfies a predetermined criterion even if rake reception is not performed if the received power is equal to or higher than the first threshold value. 5. The wireless communication device according to any one of 4. 4. The radio according to claim 2, wherein the second determination unit determines whether CPICH_Ec / N ₀ measured by the reception power measurement unit is less than the second threshold value. Communication device.   The said 2nd threshold value is a value from which an effective path | pass becomes undetectable when reception power is less than this 2nd threshold value, The said any one of Claim 2, 3, 6 characterized by the above-mentioned. Wireless communication device.   The extraction unit extracts, as a candidate for the effective path, a path whose reception level ratio with respect to the path with the maximum reception level is a predetermined value or more among the paths for which the delay profile is generated by the delay profile generation unit. The wireless communication apparatus according to any one of claims 1 to 7.   The wireless communication according to any one of claims 1 to 8, wherein the effective path setting unit preferentially selects an effective path from a path with a high reception level among paths extracted by the extraction unit. apparatus.   A mobile communication terminal device comprising the wireless communication device according to claim 1.   The mobile communication terminal apparatus according to claim 10, wherein the mobile communication terminal apparatus is a mobile phone. In a method of setting an effective path in wireless communication,
A first step of creating a delay profile of a plurality of paths corresponding to one scrambling code;
A second step of extracting a path that is a candidate of an effective path corresponding to the one scrambling code based on the delay profile;
A third step of measuring received power corresponding to the one scrambling code;
A fourth step of determining whether or not the received power measured in the third step is equal to or greater than a first threshold;
A fifth step of setting only the path extracted in the second step as an effective path corresponding to the one scrambling code;
With
If it is determined in the fourth step that the received power is greater than or equal to the first threshold, in the fifth step, the number of paths extracted in the second step is the first. Even if the predetermined number is exceeded, the number of the effective paths is limited to the first predetermined number. A sixth step of determining whether or not the received power measured in the third step is less than a second threshold (first threshold> second threshold);
If it is determined in the sixth process that the received power is less than the second threshold, in the fifth process, the number of paths extracted in the second process is the second. 13. The method for setting effective paths in wireless communication according to claim 12, wherein the number of effective paths is limited to the second predetermined number even if the predetermined number is exceeded. In a method of setting an effective path in wireless communication,
A first step of creating a delay profile of a plurality of paths corresponding to one scrambling code;
A second step of extracting a path that is a candidate of an effective path corresponding to the one scrambling code based on the delay profile;
A third step of measuring received power corresponding to the one scrambling code;
A sixth step of determining whether the received power measured in the third step is less than a second threshold;
A fifth step of setting only the path extracted in the second step as an effective path corresponding to the one scrambling code;
With
If it is determined in the sixth process that the received power is less than the second threshold, in the fifth process, the number of paths extracted in the second process is the second. Even if the predetermined number is exceeded, the number of the effective paths is limited to the second predetermined number.   The wireless communication according to claim 12 or 13, wherein in the fourth step, it is determined whether CPICH_RSCP measured in the third step is equal to or greater than the first threshold. How to set the path.   The first threshold value is a value such that the communication quality satisfies a predetermined standard even if rake reception is not performed if the received power is equal to or higher than the first threshold value. The effective path setting method in wireless communication according to any one of 15. And in the sixth process of the radio of claim 13 or 14, characterized in that said third CPICH_Ec / N ₀ that is measured by the process determines whether or not lower than the second threshold value How to set the effective path in communication.   The wireless communication according to any one of claims 13, 14, and 17, wherein the second threshold is a value such that an effective path cannot be detected when the received power is less than the second threshold. How to set the effective path in communication.   The path in which the ratio of the reception level with respect to the path with the maximum reception level is a predetermined value or more is extracted as the effective path candidate in the second process. Item 19. A method for setting an effective path in wireless communication according to any one of Items 12 to 18.   20. In the fifth process, the effective path is preferentially set from the path extracted in the second process having a higher reception level. Effective path setting method in wireless communication. A program for causing a computer to execute the effective path setting method in wireless communication according to any one of claims 12 to 20.

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