JP2013098776A - Mobile terminal and radio quality reporting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile terminal and a radio quality reporting method in which a radio quality report can be transmitted to a radio base station at a timing when an uplink radio quality is excellent.SOLUTION: A downlink radio quality measurement part 20 measures radio quality of a downlink radio signal received by antennas 11-11. An uplink radio quality estimation part 30, on the basis of a downlink radio quality measurement value, estimates uplink radio quality and outputs an estimated result as an uplink radio quality estimation value. A terminal transmission part 15 transmits a radio quality report to a base station 2 when the uplink radio quality estimation value is a predetermined value or larger. Thereby, the radio quality report can be transmitted to a radio base station at the timing when the uplink radio quality is excellent.

Description

  The present invention relates to a mobile terminal and a radio quality reporting method for reporting radio quality in a coverage area and a peripheral area of a mobile terminal.

  2. Description of the Related Art Conventionally, a technique for transmitting a wireless quality report of a location area or a peripheral area to a base station in a mobile terminal of LTE (Long Term Evolution) and W-CDMA (Wideband Code Division Multiple Access) systems is known.

  For example, Patent Document 1 describes a mobile station that transmits a measurement report to a radio base station at a constant period when the measured radio quality satisfies a predetermined report condition.

  In Patent Document 2, a timer is started when the radio quality in the specific frequency cell satisfies the report condition, and when the timer expires, a measurement report including the radio quality in the specific frequency cell is transmitted to the radio base station. The mobile station to be described is described.

JP 2009-147910 A JP 2009-232293 A

However, the above prior art has the following problems. That is, the measurement report is transmitted to the radio base station at a constant period or when the timer expires. Further, in the above prior art, the measured radio quality is only the downlink radio quality from the radio base station to the mobile station, and the timing for transmitting the radio quality report is determined based on the downlink radio quality. Is done. Therefore, depending on the transmission timing, there is a problem that the radio quality in the uplink direction from the mobile station to the radio base station is poor and the radio quality report may not reach the radio base station. For example, as shown in FIG. 21, consider a case where a measurement report is transmitted at times t ₁₁ , t ₁₂ , t ₁₃ , and t ₁₄ at a constant period T. In this case, high radio quality at time t _13, but the radio quality report is delivered to the radio base station, a time t _{11, t 12,} in t ₁₄ has low radio quality, the radio quality report does not reach the radio base station .

  Therefore, in order to solve the above problems, the present invention provides a mobile terminal and a radio quality reporting method capable of efficiently transmitting a radio quality report to a radio base station at a timing when the uplink radio quality is good. With the goal.

  In order to solve the above-described problem, the mobile terminal of the present invention measures downlink radio quality and outputs a measurement result as a downlink radio quality measurement value, based on the downlink radio quality measurement value. An uplink radio quality estimation means for estimating uplink radio quality and outputting the estimated result as an uplink radio quality estimate value, and when the uplink radio quality estimate value is a predetermined value or more, a radio quality report is sent to the base station. Transmitting means for transmitting.

  Also, the radio quality reporting method of the present invention measures downlink radio quality, outputs a measurement result as a downlink radio quality measurement value, and estimates uplink radio quality based on the downlink radio quality measurement value. An uplink radio quality estimation step for outputting the estimated result as an uplink radio quality estimate value, and a transmission step for transmitting a radio quality report to the base station when the uplink radio quality estimate value is equal to or greater than a predetermined value; .

  According to the present invention, the downlink radio quality is measured, the uplink radio quality is estimated based on the measured result, and the radio quality report is transmitted to the base station when the estimated result is a predetermined value or more. Therefore, the radio quality report is transmitted at a timing when the uplink radio quality is good, the success rate of the measurement report can be improved, and the radio quality report can be efficiently transmitted to the radio base station.

  The mobile terminal of the present invention further includes report condition determining means for determining whether or not the downlink radio quality measurement value is smaller than a predetermined threshold, and the transmission means has the downlink radio quality measurement value lower than the predetermined threshold. The radio quality report may be transmitted to the base station only when the report condition determining means determines that the value is smaller.

  According to the present invention, the radio quality report is transmitted only when the downlink radio quality measurement value is smaller than the predetermined threshold value. Therefore, it is possible to omit the radio quality report when the downlink radio quality measurement value is sufficiently good and the radio quality report is not necessary.

  Moreover, in the portable terminal of the present invention, the transmission means may set the number of times of transmitting the wireless quality report to one or less in a time interval that is divided in advance.

  According to the present invention, since the number of times of transmitting the wireless quality report is set to 1 or less in the time interval divided in advance, it is possible to prevent unnecessary wireless quality reports from being transmitted many times in a short time. it can.

  Further, the mobile terminal of the present invention further includes a plurality of antennas, and the downlink radio quality measurement means measures the antenna radio quality of each of the plurality of antennas based on radio signals received by the plurality of antennas. The uplink radio quality estimation means has an average value calculation means for calculating an average value of the downlink radio quality of each of the plurality of antennas measured by the antenna radio quality measurement means and outputting it as an uplink radio quality estimation value. May be.

  According to the present invention, the average value of the downlink radio quality of each of the plurality of antennas measured by the downlink radio quality measuring means is calculated to obtain the uplink radio quality estimated value. As a result, the influence of instantaneous fluctuations in radio quality due to short-term fading is reduced, so that it is possible to obtain a mid-section fading characteristic having a relatively high correlation between the downlink direction and the uplink direction, and to improve the uplink radio quality more accurately. Can be estimated.

  Further, the mobile terminal of the present invention further includes a plurality of antennas, and the downlink radio quality measurement means measures the antenna radio quality of each of the plurality of antennas based on radio signals received by the plurality of antennas. The uplink radio quality estimation means selects the best radio quality value from the downlink radio quality of each of the plurality of antennas measured by the antenna radio quality measurement means, and outputs the best radio quality estimate value You may have a value selection means.

  According to the present invention, the value with the best radio quality is selected from the downlink radio qualities of each of the plurality of antennas measured by the downlink radio quality measuring means, and is set as the uplink radio quality estimated value. As a result, the effect of an instantaneous drop in radio quality due to short-term fading is reduced, so that it is possible to obtain a medium-term fading characteristic with relatively high correlation between the downlink direction and the uplink direction, and the uplink radio quality is more accurate. Can be estimated well.

  Further, in the mobile terminal of the present invention, the uplink radio quality estimation means estimates the uplink radio quality based on a filter for smoothing the time variation of the downlink radio quality measurement value and the downlink radio quality measurement value smoothed by the filter. And calculating means for outputting as an uplink radio quality estimated value.

  According to the present invention, the uplink radio quality estimation means smoothes the time variation of the downlink radio quality measurement value by the filter, and estimates the uplink radio quality based on the smoothed downlink radio quality measurement value. Therefore, the influence of the rapid fluctuation of the downlink radio quality measurement value is alleviated by the filter, and the timing for transmitting the radio quality report can be determined more stably.

  Further, in the mobile terminal of the present invention, the uplink radio quality estimating means smoothes the time variation of the calculation result calculated by the calculation means for calculating the uplink radio quality based on the downlink radio quality measurement value and the calculation means. And a filter that outputs the result as an uplink radio quality estimation value.

  According to the present invention, the uplink radio quality estimation means performs the calculation for estimating the uplink radio quality based on the downlink radio quality measurement value in the calculation means, and then smoothes the time variation of the calculation result by the filter to obtain the uplink radio quality. Output as an estimated value. Therefore, the influence of the instantaneous fluctuation due to the short-term fading included in the calculation result of the calculation means is mitigated by the filter, and the timing for transmitting the wireless quality report can be determined more stably.

  According to the present invention, it is possible to transmit a radio quality report from a mobile terminal to a radio base station at a timing when the uplink radio quality is good. Therefore, the success rate of the radio quality report can be improved, and the radio quality report can be efficiently transmitted to the radio base station.

It is a figure which shows the outline of a function structure of the portable terminal which concerns on 1st Embodiment. It is a figure which shows the hardware constitutions of the portable terminal which concerns on 1st Embodiment. It is a figure which shows the detailed functional structure of the portable terminal which concerns on 1st Embodiment. It is a figure which shows the whole flow of the report transmission in the portable terminal which concerns on 1st Embodiment. It is a figure which shows the report transmission basic flow in the portable terminal which concerns on 1st Embodiment. It is a figure which shows the report transmission timing in the portable terminal which concerns on 1st Embodiment. It is a figure which shows the uplink wireless quality estimation flow in the portable terminal which concerns on 1st Embodiment. It is a figure which shows the radio | wireless quality estimated in the portable terminal which concerns on 1st Embodiment. It is a figure which shows the detailed functional structure of the portable terminal which concerns on 2nd Embodiment. It is a figure which shows the uplink wireless quality estimation flow in the portable terminal which concerns on 2nd Embodiment. It is a figure which shows the detailed functional structure of the portable terminal which concerns on 3rd Embodiment. It is a figure which shows the uplink wireless quality estimation flow in the portable terminal which concerns on 3rd Embodiment. It is a figure which shows the radio | wireless quality estimated in the portable terminal which concerns on 3rd Embodiment. It is a figure which shows the detailed functional structure of the portable terminal which concerns on 4th Embodiment. It is a figure which shows the uplink wireless quality estimation flow in the portable terminal which concerns on 4th Embodiment. It is a figure which shows the detailed functional structure of the portable terminal which concerns on 5th Embodiment. It is a figure which shows the uplink wireless quality estimation flow in the portable terminal which concerns on 5th Embodiment. It is a figure which shows the radio | wireless quality estimated in the portable terminal which concerns on 5th Embodiment. It is a figure which shows the detailed functional structure of the portable terminal which concerns on 6th Embodiment. It is a figure which shows the uplink wireless quality estimation flow in the portable terminal which concerns on 6th Embodiment. It is a figure which shows the report transmission timing in the conventional portable terminal.

  Embodiments of the present invention will be described with reference to the accompanying drawings. Where possible, the same parts are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
FIG. 1 is a diagram illustrating an outline of a functional configuration of the mobile terminal according to the first embodiment. In the first embodiment, the mobile terminal 1 receives a downlink radio signal from the base station 2 and transmits an uplink radio signal to the base station 2. In addition, the mobile terminal 1 includes a plurality of antennas 11 _{1 to} 11 _N , a terminal reception unit 12, a report condition determination unit 13 (report condition determination unit), a transmission timing determination unit 14, a terminal transmission unit 15 (transmission unit), and downlink radio It includes a quality measuring unit 20 (downlink radio quality measuring means) and an uplink radio quality estimating unit 30 (uplink radio quality estimating means).

  FIG. 2 is a hardware block diagram of the mobile terminal 1. As shown in FIG. 2, the mobile terminal 1 physically includes a CPU 101, a RAM 102 and a ROM 103 that are main storage devices, a communication module 104 that is a device for transmitting and receiving data via a wireless communication network, a hard disk, The computer system includes an auxiliary storage device 105 such as a flash memory, an input device 106 such as a keyboard as an input device, an output device 107 such as a display, and the like. Each function shown in FIG. 1 has a communication module 104, an input device 106, and an output device 107 under the control of the CPU 101 by loading predetermined computer software on the hardware such as the CPU 101 and the RAM 102 shown in FIG. This is realized by reading and writing data in the RAM 102 and the auxiliary storage device 105. Hereinafter, each functional element of the portable terminal 1 will be described with reference to FIG.

The antennas 11 _{1 to} 11 _N are parts for receiving a downlink radio signal from the base station 2, converting it into an electric signal, and outputting it to the terminal receiver 12. The antennas 11 _{1 to} 11 _N are also portions for converting the electric signal output from the terminal transmission unit 15 into a radio wave and transmitting the radio signal to the base station 2 as an uplink radio signal.

The terminal receiving unit 12 is a part that receives a downlink radio signal from the base station 2 via the antennas 11 _{1 to} 11 _N and outputs the received radio signal to the downlink radio quality measuring unit 20.

  The downlink radio quality measuring unit 20 is a part that measures downlink radio quality and outputs a measurement result as a downlink radio quality measurement value. A detailed configuration of the downlink radio quality measurement unit 20 will be described later.

  The uplink radio quality estimation unit 30 is a part that estimates the uplink radio quality based on the downlink radio quality measurement value output from the downlink radio quality measurement unit 20, and outputs the estimated result as the uplink radio quality estimation value. A detailed configuration of the uplink radio quality estimation unit 30 will be described later.

  The reporting condition determination unit 13 is a part that determines whether or not the downlink wireless quality measurement result satisfies the condition for transmitting the wireless quality report from the mobile terminal 1 to the base station 2. As a condition for transmitting the radio quality report, for example, a condition that the downlink radio quality measurement value output from the downlink radio quality measurement unit 20 is smaller than a predetermined threshold can be used. Here, the radio quality report is performed for the mobile terminal 1 to perform handover to another cell when the radio quality in the cell to which the mobile terminal 1 belongs is poor. For this reason, if the radio quality in the cell to which the mobile terminal 1 belongs is sufficiently good, the radio quality report is unnecessary. Therefore, the predetermined threshold value of the downlink radio quality measurement value is set to such a value that the radio quality report is not required if the downlink radio quality measurement value exceeds the threshold value.

  The transmission timing determining unit 14 determines that the condition for transmitting the radio quality report is satisfied, and the report condition determining unit 13 determines that the uplink radio quality estimated value is equal to or greater than a certain value. This is a part for sending an instruction to transmit a radio quality report to the terminal transmission unit 15. Moreover, the transmission timing determination part 14 has a timer. This timer is for measuring a certain time and dividing a time interval every certain time. In the time interval previously divided by this timer, the mobile terminal 1 sets the number of times of transmitting the wireless quality report to 1 or less.

The terminal transmission unit 15 is a part for receiving a command from the transmission timing determination unit 14 and transmitting a radio quality report to the base station 2 via the antennas 11 _{1 to} 11 _N.

  Next, the downlink radio quality measurement unit 20 and the uplink radio quality estimation unit 30 will be described in more detail with reference to FIG. FIG. 3 is a diagram illustrating a detailed functional configuration of the mobile terminal according to the first embodiment.

The downlink radio quality measurement unit 20 includes N antenna radio quality measurement units 21 _{1 to} 21 _N (antenna radio quality measurement means). The antenna radio quality measuring unit 21 ₁ measures the downlink radio quality of the signal received by the antenna 11 ₁ . Similarly, antenna radio quality measuring section ₂₁₂ measures the downlink radio quality of the signal received by the antenna 11 _2, antenna radio quality measuring unit 21 _N is the downlink radio quality of the signal received by the antenna 11 _N taking measurement. Then, the antenna radio quality measurement units 21 _{1 to} 21 _N output downlink radio quality measurement values of signals received by the antennas 11 _{1 to} 11 _N , respectively.

The uplink radio quality estimation unit 30 includes an average value calculation unit 36 (average value calculation means). The average value calculation unit 36 calculates an average value of N downlink radio quality measurement values output by the antenna radio quality measurement units 21 _{1 to} 21 _N , and outputs the calculated average value as an uplink radio quality estimation value. Part.

  Next, a radio quality reporting method in the mobile terminal 1 configured as described above will be described with reference to FIG. FIG. 4 is a diagram illustrating an overall flow of report transmission in the mobile terminal according to the first embodiment.

  First, the transmission timing determination unit 14 starts a timer (step S11). Here, as a trigger condition for starting the timer, for example, the condition that the radio quality report instructed from the network is satisfied can be set as the trigger condition. As a condition for the radio quality report, specifically, the case where the downlink radio quality falls below a predetermined threshold can be considered. Next, the mobile terminal 1 executes the report transmission basic flow and estimates the uplink radio quality from the downlink radio quality measurement value. (Step S12). Details of this report transmission basic flow will be described later. Then, the transmission timing determination unit 14 determines whether or not the transmission of the wireless quality report has been completed (step S13). If it is determined that the transmission of the wireless quality report has been completed, the mobile terminal 1 waits until a predetermined time elapses and the timer expires (step S14). On the other hand, when it is determined that the transmission of the wireless quality report has not ended, the transmission timing determination unit 14 determines whether or not the timer has expired after a certain period of time has passed (step S15). If it is determined that the timer has not expired, the process returns to step S12 again, and the mobile terminal 1 executes the report transmission basic flow. On the other hand, if it is determined that the timer has expired, the flow ends. The report transmission flow described above is repeatedly executed at regular time intervals.

  Next, the report transmission basic flow will be described in more detail with reference to FIG. FIG. 5 is a diagram showing a basic report transmission flow in the mobile terminal according to the first embodiment.

First, the downlink radio quality measurement unit 20 measures the downlink radio quality in the antennas 11 _{1 to} 11 _N and outputs a downlink radio quality measurement value (step S21: downlink radio quality measurement step). Next, the report condition determination unit 13 determines whether or not the wireless quality report condition instructed from the network is satisfied (step S22). Here, the condition for the radio quality report is that the downlink radio quality is below the threshold 1. If the wireless quality report condition is not satisfied, the portable terminal 1 ends the process as it is. On the other hand, if the condition for the radio quality report is satisfied, the uplink radio quality estimation unit 30 estimates the uplink radio quality based on the downlink radio quality measurement value, and outputs the uplink radio quality estimation value (step S23). : Uplink radio quality estimation step).

  Next, the transmission timing determination unit 14 determines whether or not the uplink radio quality estimation value exceeds a certain value (step S24). Here, the above-mentioned constant value is the threshold value 2. If the uplink radio quality estimated value does not exceed the threshold value 2, the mobile terminal 1 ends the process as it is. On the other hand, when the estimated uplink radio quality value exceeds the threshold value 2, the transmission timing determination unit 14 sends an instruction to transmit a radio quality report to the terminal transmission unit 15, and the terminal transmission unit 15 Is transmitted to the base station 2 (step S25: transmission step). The basic report transmission flow described above is repeatedly executed at regular time intervals.

  The transmission timing when the wireless quality report is transmitted by the report transmission flow described above will be described with reference to FIG. FIG. 6 is a diagram illustrating report transmission timing in the mobile terminal according to the first embodiment. A curve Q1 indicates time variation of the uplink radio quality estimation value. The dotted line L represents the uplink radio quality threshold.

In the time zone T ₁ divided at regular time intervals T, the uplink radio quality estimated value exceeds the threshold value for the first time at time t ₁ . At time t _1, the terminal transmission unit 15 transmits a radio quality report. In the time period T _1, the terminal transmission unit 15 transmits only the radio quality report once at time t _1, is not able to send two or more radio quality report. Similarly, in time zone T ₂ , terminal transmission unit 15 transmits a radio quality report only once at time t ₂ when the uplink radio quality estimate exceeds the threshold value for the first time. In the time period T _3, since there is no possible uplink radio quality estimate exceeds the threshold, the terminal transmission unit 15 does not transmit a radio quality report.

  Next, uplink radio quality estimation processing in the report transmission basic flow will be described with reference to FIG. FIG. 7 is a diagram showing an uplink radio quality estimation flow in the mobile terminal according to the first embodiment.

The average value calculation unit 36 calculates the average value of the downlink radio quality measurement values in each of the antennas 11 _{1 to} 11 _N , and outputs the calculation result as the uplink radio quality estimation value (step S31).

  As described above, according to the mobile terminal according to the first embodiment, the downlink radio quality is measured, the uplink radio quality is estimated based on the measurement result, and the base station when the estimated result is a predetermined value or more Since the radio quality report is transmitted to the station 2, the radio quality report is transmitted at a timing when the uplink radio quality is good, and the success probability of the measurement report can be improved.

  Further, according to the mobile terminal according to the first embodiment, since the radio quality report is transmitted only when the downlink radio quality measurement value is smaller than the predetermined threshold, the downlink radio quality measurement value is sufficiently good, Radio quality reporting when there is no need for quality reporting can be omitted.

  In addition, since the number of times of transmitting the wireless quality report is set to 1 or less in the time interval divided in advance, it is possible to prevent unnecessary wireless quality reports from being transmitted many times in a short time.

Furthermore, the uplink radio quality can be estimated more accurately by calculating the average value of the downlink radio quality measurement values in each of the antennas 11 _{1 to} 11 _N. This effect will be described with reference to FIG. FIG. 8 is a diagram illustrating the wireless quality estimated in the mobile terminal according to the first embodiment. Here, a description as an example, the mobile terminal 1 is provided with two antennas of the antenna 11 ₁ and antenna 11 _2.

Figure 8 curves Q11 and Q12 of (a), respectively showing a downlink radio quality measurements in the antenna 11 ₁ and antenna 11 _2. Figure curves Q13 of 8 (b) shows an average value of downlink radio quality measurements in the antenna 11 ₁ and antenna 11 _2. Thus, by calculating the average value of the downlink radio quality measurement values at the _two antennas 11 ₁ and 11 ₂ , the influence of instantaneous fluctuations in radio quality due to short-term fading is reduced. A mid-section fading characteristic having a relatively high correlation between directions can be obtained, and uplink radio quality can be estimated more accurately.

(Second Embodiment)
The mobile terminal according to the second embodiment is similar to the mobile terminal 1 according to the first embodiment shown in FIG. 1, the antennas 11 _{1 to} 11 _N , the terminal receiving unit 12, the report condition determining unit 13, and the transmission timing determining unit. 14, the terminal transmission part 15, and the downlink radio | wireless quality measurement part 20 are comprised. Moreover, the mobile terminal according to the second embodiment is different from the mobile terminal 1 according to the first embodiment in that an uplink radio quality estimation unit 31 described below is provided instead of the uplink radio quality estimation unit 30. .

The uplink radio quality estimation unit 31 will be described with reference to FIG. FIG. 9 is a diagram illustrating a detailed functional configuration of the mobile terminal according to the second embodiment. The uplink radio quality estimation unit 31 includes a best value selection unit 37 (best value selection means). The best value selection unit 37 selects the best value of the N downlink radio quality measurement values output by the antenna radio quality measurement units 21 _{1 to} 21 _N , and outputs the selected best value as the uplink radio quality estimation value. Part.

  Next, a radio quality reporting method in the mobile terminal according to the second embodiment will be described. As shown in FIG. 5, also in the mobile terminal according to the second embodiment, the downlink radio quality is measured, it is determined whether the report condition is satisfied, the uplink radio quality is estimated, and the uplink radio quality is The point of determining whether or not the threshold value 2 is exceeded and transmitting the report is the same as in the case of the mobile terminal 1 according to the first embodiment. Among these, in the second embodiment, the process of estimating the uplink radio quality is different from that in the first embodiment.

  The uplink radio quality estimation process according to the second embodiment will be described with reference to FIG. FIG. 10 is a diagram showing an uplink radio quality estimation flow in the mobile terminal according to the second embodiment.

The best value selection unit 37 selects the best value of the downlink radio quality measurement values of the antennas 11 _{1 to} 11 _N , and outputs the selection result as the uplink radio quality estimation value (step S41).

  As described above, according to the mobile terminal according to the second embodiment, the success probability of measurement reports can be improved similarly to the mobile terminal according to the first embodiment, and unnecessary radio quality reports are omitted. be able to.

Furthermore, according to the mobile terminal according to the second embodiment, the radio quality due to the short-term fading is selected by selecting the best value of the downlink radio quality measurement value in each of the antennas 11 _{1 to} 11 _N and using it as the uplink radio quality estimation value. Therefore, it is possible to obtain a middle section fading characteristic having a relatively high correlation between the downlink direction and the uplink direction, and to estimate the uplink radio quality more accurately.

(Third embodiment)
The mobile terminal according to the third embodiment is similar to the mobile terminal 1 according to the first embodiment shown in FIG. 1, the antennas 11 _{1 to} 11 _N , the terminal receiving unit 12, the report condition determining unit 13, and the transmission timing determining unit. 14, the terminal transmission part 15, and the downlink radio | wireless quality measurement part 20 are comprised. Moreover, the mobile terminal according to the third embodiment is different from the mobile terminal 1 according to the first embodiment in that an uplink radio quality estimation unit 32 described below is provided instead of the uplink radio quality estimation unit 30. .

The uplink radio quality estimation unit 32 will be described with reference to FIG. FIG. 11 is a diagram illustrating a detailed functional configuration of the mobile terminal according to the third embodiment. The uplink radio quality estimation unit 32 includes a filter 38 and an average value calculation unit 36 (calculation means). Here, in the uplink radio quality estimation unit 32, a total of N filters 38 are provided, one for each of the N antenna radio quality measurement units 21 _{1 to} 21 _N. The output values of the N filters 38 are input to the average value calculation unit 36.

The filter 38 is a part for smoothing the time variation of the input value. Here, as a calculation method for performing smoothing, for example, there is a calculation method using the following equation (1).
y (t) = (1- [alpha]) y (t-1) + [alpha] x (t) (1)
In the above equation (1), x (t) is an input value of the filter 38 at time t, and y (t) is an output value of the filter 38 at time t. Α is a coefficient satisfying 0 <α <0.5.

  Next, a radio quality reporting method in the mobile terminal according to the third embodiment will be described. As shown in FIG. 5, also in the mobile terminal according to the third embodiment, the downlink radio quality is measured, it is determined whether the report condition is satisfied, the uplink radio quality is estimated, and the uplink radio quality is The point of determining whether or not the threshold value 2 is exceeded and transmitting the report is the same as in the case of the mobile terminal 1 according to the first embodiment. Among these, in the third embodiment, the process of estimating the uplink radio quality is different from that in the first embodiment.

The uplink radio quality estimation process according to the third embodiment will be described with reference to FIG. FIG. 12 is a diagram illustrating an uplink radio quality estimation flow in the mobile terminal according to the third embodiment. First, the filter 38 smoothes the downlink radio quality measurement values of the antennas 11 _{1 to} 11 _N (step S51). Next, the average value calculation unit 36 calculates the average value of the downlink radio quality measurement values of each of the smoothed antennas 11 _{1 to} 11 _N , and outputs the calculation result as the uplink radio quality estimation value (step S52).

  As described above, according to the mobile terminal according to the third embodiment, it is possible to improve the success probability of the measurement report similarly to the mobile terminal according to the first embodiment, and omit unnecessary radio quality reports. be able to.

Furthermore, according to the portable terminal which concerns on 3rd Embodiment, the determination of the timing which transmits a radio | wireless quality report can be performed more stably. This effect will be described with reference to FIG. FIG. 13 is a diagram illustrating the wireless quality estimated in the mobile terminal according to the third embodiment. Here, the mobile terminal will be described as an example the case of providing the two antennas of the antenna 11 ₁ and antenna 11 _2.

Curves Q21 and Q22 in FIG. 13A show values after the time fluctuation of the downlink radio quality measurement values at the antennas 11 ₁ and 11 ₂ are smoothed by the filter 38, respectively. A curve Q23 in FIG. 13B shows an average value of the two values after the above smoothing. As described above, the uplink radio quality estimation unit 32 smoothes the time variation of the downlink radio quality measurement value by the filter 38 and estimates the uplink radio quality based on the smoothed downlink radio quality measurement value. Therefore, the influence of the rapid fluctuation of the downlink radio quality measurement value is mitigated by the filter 38, and the timing for transmitting the radio quality report can be determined more stably.

(Fourth embodiment)
Similarly to the mobile terminal according to the third embodiment, the mobile terminal according to the fourth embodiment includes the antennas 11 _{1 to} 11 _N , the terminal reception unit 12, the report condition determination unit 13, the transmission timing determination unit 14, and the terminal transmission unit 15. , And a downlink radio quality measurement unit 20. Further, the mobile terminal according to the fourth embodiment is different from the mobile terminal according to the third embodiment in that an uplink radio quality estimation unit 33 described below is provided instead of the uplink radio quality estimation unit 32.

The uplink radio quality estimation unit 33 will be described with reference to FIG. FIG. 14 is a diagram illustrating a detailed functional configuration of the mobile terminal according to the fourth embodiment. The uplink radio quality estimation unit 31 includes a filter 38 and a best value selection unit 37 (calculation means). Here, in the uplink radio quality estimation unit 33, a total of N filters 38 are provided, one for each of the N antenna radio quality measurement units 21 _{1 to} 21 _N. The output values of the N filters 38 are input to the best value selection unit 37.

  Next, a radio quality reporting method in the mobile terminal according to the fourth embodiment will be described. As shown in FIG. 5, also in the mobile terminal according to the fourth embodiment, the downlink radio quality is measured, it is determined whether the report condition is satisfied, the uplink radio quality is estimated, and the uplink radio quality is The point of determining whether or not the threshold value 2 is exceeded and transmitting the report is the same as in the case of the mobile terminal 1 according to the first embodiment. Among these, in the fourth embodiment, the process of estimating the uplink radio quality is different from that in the first embodiment.

The uplink radio quality estimation process according to the fourth embodiment will be described with reference to FIG. FIG. 15 is a diagram illustrating an uplink radio quality estimation flow in the mobile terminal according to the fourth embodiment. First, the filter 38 smoothes the downlink radio quality measurement values of the antennas 11 _{1 to} 11 _N (step S61). Next, the best value selection unit 37 selects the best value of the downlink radio quality measurement values of each of the smoothed antennas 11 _{1 to} 11 _N , and outputs the selection result as the uplink radio quality estimation value (step S62).

  As described above, according to the mobile terminal according to the fourth embodiment, it is possible to improve the success probability of the measurement report similarly to the mobile terminal according to the first embodiment, and omit unnecessary radio quality reports. be able to.

  Further, according to the mobile terminal according to the fourth embodiment, the best value of the downlink radio quality of all antennas is selected as in the mobile terminal according to the second embodiment. The influence of the drop is reduced, and the uplink radio quality can be estimated more accurately.

  Furthermore, according to the mobile terminal according to the fourth embodiment, similarly to the mobile terminal according to the third embodiment, the influence of the rapid fluctuation of the downlink radio quality measurement value is alleviated by the filter 38, and the radio quality report is transmitted. The timing can be determined more stably.

(Fifth embodiment)
The mobile terminal according to the fifth embodiment is similar to the mobile terminal 1 according to the first embodiment shown in FIG. 1, the antennas 11 _{1 to} 11 _N , the terminal receiving unit 12, the report condition determining unit 13, and the transmission timing determining unit. 14, the terminal transmission part 15, and the downlink radio | wireless quality measurement part 20 are comprised. Further, the mobile terminal according to the fifth embodiment is different from the mobile terminal 1 according to the first embodiment in that an uplink radio quality estimation unit 34 described below is provided instead of the uplink radio quality estimation unit 30. .

The uplink radio quality estimation unit 34 will be described with reference to FIG. FIG. 16 is a diagram illustrating a detailed functional configuration of the mobile terminal according to the fifth embodiment. The uplink radio quality estimation unit 34 includes an average value calculation unit 36 (calculation means) and one filter 38. Here, in the uplink radio quality estimation unit 34, N downlink radio quality measurement values output by the antenna radio quality measurement units 21 _{1 to} 21 _N are input to the average value calculation unit 36. The average value to be output is input to the filter 38.

  Next, a radio quality reporting method in the mobile terminal according to the fifth embodiment will be described. As shown in FIG. 5, also in the mobile terminal according to the fifth embodiment, the downlink radio quality is measured, it is determined whether the report condition is satisfied, the uplink radio quality is estimated, and the uplink radio quality is The point of determining whether or not the threshold value 2 is exceeded and transmitting the report is the same as in the case of the mobile terminal 1 according to the first embodiment. Among these, in the fifth embodiment, the process of estimating the uplink radio quality is different from that in the first embodiment.

The uplink radio quality estimation process according to the fifth embodiment will be described with reference to FIG. FIG. 17 is a diagram showing an uplink radio quality estimation flow in the mobile terminal according to the fifth embodiment. First, the average value calculation unit 36 calculates the average value of the downlink radio quality measurement values in each of the antennas 11 _{1 to} 11 _N , and outputs the calculation result (step S71). Next, the filter 38 smoothes the time variation of the calculation result output from the average value calculation unit 36, and outputs the smoothed result as an uplink radio quality estimation value (step S72).

  As described above, according to the mobile terminal according to the fifth embodiment, it is possible to improve the success probability of measurement reports similarly to the mobile terminal according to the first embodiment, and omit unnecessary radio quality reports. be able to.

  Furthermore, according to the portable terminal which concerns on 5th Embodiment, determination of the timing which transmits a radio | wireless quality report can be performed more stably. This effect will be described with reference to FIG. FIG. 18 is a diagram illustrating the wireless quality estimated in the mobile terminal according to the third embodiment.

A curve Q31 in FIG. 18A indicates an average value of the downlink radio quality measurement values in all the antennas 11 _{1 to} 11 _{N included} in the mobile terminal. A curve Q32 in FIG. 18B shows a value after the above average value is smoothed by the filter 38. As described above, the uplink radio quality estimation unit 32 calculates the average value of the downlink radio quality measurement values, and then smoothes the temporal variation of the average value by the filter and outputs the result as the uplink radio quality estimation value. The influence of instantaneous fluctuations due to the short-term fading included in the result is alleviated by the filter, and the timing for transmitting the radio quality report can be determined more stably.

(Sixth embodiment)
Similarly to the mobile terminal according to the fifth embodiment, the mobile terminal according to the sixth embodiment includes the antennas 11 _{1 to} 11 _N , the terminal reception unit 12, the report condition determination unit 13, the transmission timing determination unit 14, and the terminal transmission unit 15. , And a downlink radio quality measurement unit 20. Further, the mobile terminal according to the sixth embodiment is different from the mobile terminal according to the fifth embodiment in that an uplink radio quality estimation unit 35 described below is provided instead of the uplink radio quality estimation unit 34.

The uplink radio quality estimation unit 35 will be described with reference to FIG. FIG. 19 is a diagram illustrating a detailed functional configuration of the mobile terminal according to the sixth embodiment. The uplink radio quality estimation unit 35 includes a best value selection unit 37 (calculation means) and one filter 38. Here, in the uplink radio quality estimation unit 35, N downlink radio quality measurement values output by the antenna radio quality measurement units 21 _{1 to} 21 _N are input to the best value selection unit 37. The best value to be output is input to the filter 38.

  Next, a radio quality reporting method in the mobile terminal according to the sixth embodiment will be described. As shown in FIG. 5, also in the mobile terminal according to the sixth embodiment, the downlink radio quality is measured, it is determined whether the report condition is satisfied, the uplink radio quality is estimated, and the uplink radio quality is The point of determining whether or not the threshold value 2 is exceeded and transmitting the report is the same as in the case of the mobile terminal 1 according to the first embodiment. Among these, in the sixth embodiment, the process of estimating the uplink radio quality is different from that in the first embodiment.

The uplink radio quality estimation process according to the sixth embodiment will be described with reference to FIG. FIG. 20 is a diagram showing an uplink radio quality estimation flow in the mobile terminal according to the sixth embodiment. First, the best value selection unit 37 selects the best value of the downlink radio quality measurement values in each of the antennas 11 _{1 to} 11 _N , and outputs the calculation result (step S81). Next, the filter 38 smoothes the time variation of the calculation result output from the best value selection unit 37, and outputs the smoothed result as an uplink radio quality estimation value (step S82).

  As described above, according to the mobile terminal according to the sixth embodiment, it is possible to improve the success probability of the measurement report similarly to the mobile terminal according to the first embodiment, and omit unnecessary radio quality reports. be able to.

  Also, according to the mobile terminal according to the sixth embodiment, since the best value of the downlink radio quality of all antennas is selected as in the mobile terminal according to the second embodiment, the instantaneous wireless quality due to short-term fading is selected. The influence of the drop is reduced, and the uplink radio quality can be estimated more accurately.

  Furthermore, according to the mobile terminal according to the sixth embodiment, similarly to the mobile terminal according to the fifth embodiment, the influence of instantaneous fluctuations due to short-term fading included in the calculation result of the calculation means is reduced by the filter, and the wireless quality The timing for transmitting the report can be determined more stably.

1 ... portable terminal, 2 ... base station, ₁₁ 1 to 11 N _... antenna, 12 ... terminal receiving unit, 13 ... report condition determining unit, 14 ... transmission timing determination unit, 15 ... terminal transmission portion 15, 20 ... downlink radio quality Measurement unit, 21 _{1 to} 21 _N ... Antenna radio quality measurement unit, 30, 31, 32, 33, 34, 35 ... Uplink radio quality estimation unit, 36 ... Average value calculation unit, 37 ... Best value selection unit, 38 ... Filter .

Claims (8)

Downlink radio quality measuring means for measuring the downlink radio quality and outputting the measured result as a downlink radio quality measurement value;
Uplink radio quality estimation means for estimating uplink radio quality based on the downlink radio quality measurement value and outputting the estimated result as an uplink radio quality estimate value;
A transmission means for transmitting a radio quality report to a base station when the uplink radio quality estimate is equal to or greater than a predetermined value;
A mobile terminal comprising: Further comprising report condition determination means for determining whether the downlink radio quality measurement value is smaller than a predetermined threshold,
The transmitting means determines to transmit the wireless quality report to a base station only when the reporting condition determining means determines that the downlink wireless quality measurement value is smaller than the predetermined threshold. The mobile terminal according to 1.   3. The mobile terminal according to claim 1, wherein the transmitting unit sets the number of times the wireless quality report is transmitted to one or less in a predetermined time interval. A plurality of antennas,
The downlink radio quality measurement means includes antenna radio quality measurement means for measuring downlink radio quality of each of the plurality of antennas based on radio signals received by the plurality of antennas;
The uplink radio quality estimation unit includes an average value calculation unit that calculates an average value of downlink radio quality of each of the plurality of antennas measured by the antenna radio quality measurement unit and outputs the average value as an uplink radio quality estimation value. The mobile terminal according to any one of 1 to 3. A plurality of antennas,
The downlink radio quality measurement means includes antenna radio quality measurement means for measuring downlink radio quality of each of the plurality of antennas based on radio signals received by the plurality of antennas;
The uplink radio quality estimation means selects the best radio quality value from among the downlink radio quality of each of the plurality of antennas measured by the antenna radio quality measurement means, and outputs the best value selection as an uplink radio quality estimation value The portable terminal of any one of Claim 1 to 3 which has a means. The uplink radio quality estimation means includes
A filter for smoothing the time variation of the downlink radio quality measurement value;
An arithmetic means for estimating an uplink radio quality based on the downlink radio quality measurement value smoothed by the filter and outputting as an uplink radio quality estimate value;
The mobile terminal according to any one of claims 1 to 5, which has The uplink radio quality estimation means includes
Calculation means for performing calculation for estimating uplink radio quality based on the downlink radio quality measurement value;
A filter that smoothes the time variation of the calculation result calculated by the calculation means and outputs the result as the uplink radio quality estimation value;
The mobile terminal according to any one of claims 1 to 5, which has A downlink radio quality measurement step of measuring downlink radio quality and outputting the measurement result as a downlink radio quality measurement value;
An uplink radio quality estimation step of estimating uplink radio quality based on the downlink radio quality measurement value, and outputting the estimated result as an uplink radio quality estimate value;
A transmission step of transmitting a radio quality report to a base station when the uplink radio quality estimate is equal to or greater than a predetermined value;
A radio quality reporting method comprising:

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