WO2013141307A1 - Reception device and reception power measurement method - Google Patents

Reception device and reception power measurement method Download PDF

Info

Publication number
WO2013141307A1
WO2013141307A1 PCT/JP2013/058109 JP2013058109W WO2013141307A1 WO 2013141307 A1 WO2013141307 A1 WO 2013141307A1 JP 2013058109 W JP2013058109 W JP 2013058109W WO 2013141307 A1 WO2013141307 A1 WO 2013141307A1
Authority
WO
WIPO (PCT)
Prior art keywords
averaging
period
value obtained
reception power
unit
Prior art date
Application number
PCT/JP2013/058109
Other languages
French (fr)
Japanese (ja)
Inventor
石田　一博
Original Assignee
Ｎｅｃカシオモバイルコミュニケーションズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｎｅｃカシオモバイルコミュニケーションズ株式会社 filed Critical Ｎｅｃカシオモバイルコミュニケーションズ株式会社
Publication of WO2013141307A1 publication Critical patent/WO2013141307A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only

Definitions

  • the present invention is based on a Japanese patent application: Japanese Patent Application No. 2012-0665261 (filed on Mar. 22, 2012), and the entire contents of this application are incorporated herein by reference.
  • the present invention relates to a receiving apparatus and a received power measuring method, and more particularly to a receiving apparatus provided in a mobile terminal in an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, and a received power measuring method by the receiving apparatus.
  • OFDM Orthogonal Frequency Division Multiplexing
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • Patent Document 1 A method for measuring channel quality in an OFDM communication system is described in Patent Document 1 as an example.
  • the receiving device When calculating the signal reception power, the receiving device provided in the mobile terminal performs a voltage averaging process on the channel estimation value in the time direction, and further averages in the frequency direction, and then between adjacent reference signals (RS: Reference Signal) Then, conjugate multiplication is performed, and the received signal power is calculated using a value obtained by in-phase averaging the results.
  • RS Reference Signal
  • the accuracy of the signal received power can be improved by taking a long voltage average period in the time axis direction.
  • the voltage average time in the time axis direction is increased, there is a problem that the estimated power is reduced due to an error due to a rotation component.
  • An object of the present invention is to provide a receiving apparatus and a received power measuring method for solving such a problem.
  • the receiving apparatus is: In an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, a first signal reception power is measured using a value obtained by averaging a channel estimation value estimated based on a known reference signal over a first period. A first reference signal received power (RSRP) measurement unit; A second RSRP measurement unit that measures a second received signal power using a value obtained by averaging the channel estimation value over a second period; An RSRP selection unit that compares the first signal reception power with the second signal reception power and selects a value not smaller as a measurement result of the signal reception power;
  • OFDM Orthogonal Frequency Division Multiplexing
  • the received power measuring method is: A signal reception power measurement method by a mobile terminal in an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, Calculating a first signal reception power using a value obtained by averaging a channel estimation value estimated based on a known reference signal over a first period; Calculating a second signal reception power using a value obtained by averaging the channel estimation value over a second period; Comparing the first signal reception power and the second signal reception power and selecting the one having a smaller value as the measurement result of the signal reception power.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the receiving apparatus is: In an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, a first signal reception power is measured using a value obtained by averaging a channel estimation value estimated based on a known reference signal over a first period. And a reference signal received power (RSRP) measuring unit for measuring the second signal received power using a value averaged over the second period; An RSRP selection unit that compares the first signal reception power with the second signal reception power and selects a value not smaller as a measurement result of the signal reception power;
  • OFDM Orthogonal Frequency Division Multiplexing
  • received power can be measured with high accuracy in a high-speed fading environment.
  • the power is measured as a low value due to phase rotation. In such an environment, the power is measured with higher accuracy when the averaging period of the voltage averaging process is shortened.
  • the result of measuring the power by dividing the period for calculating the voltage average in the entire measurement period into MH and the result of dividing the measurement into M L (M H > M L ).
  • the results of measuring the power are compared and the higher power is selected as the measurement result.
  • the power measurement accuracy in a high-speed fading environment can be improved.
  • the result of measuring the power with the voltage average calculation period shortened is compared with the result of measuring the power with the voltage average calculation period lengthened, and the higher power is selected. Sometimes it is possible to estimate the received signal power with high accuracy.
  • a receiving apparatus (10) is a value obtained by averaging channel estimation values estimated based on known reference signals in an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system over a first period.
  • the first reference signal received power (RSRP: Reference Signal Received Power) measuring unit (20H) that measures the first signal received power and the channel estimation value are averaged over a second period Using the value, the second RSRP measurement unit (20L) that measures the second signal reception power is compared with the first signal reception power and the second signal reception power, And an RSRP selection unit (30) that selects as a measurement result of the signal reception power.
  • the RSRP selection unit (30) may use either the first signal reception power or the second signal reception power as a measurement result. .
  • the first RSRP measurement unit (20H) performs the first based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over a first period.
  • the second RSRP measurement unit (20L) calculates a signal reception power of the signal, and a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over a second period. Based on the above, the second received signal power may be calculated.
  • the first RSRP measurement unit (20H) and the second RSRP measurement unit (20L) each include a measurement period division unit (21) that divides the measurement period of the reference signal, A time direction voltage averaging unit (22) that averages the channel estimation values over each of the divided periods, and a frequency direction averaging unit (23) that averages the values obtained by the averaging in the frequency direction.
  • a conjugate multiplier (24) that performs conjugate multiplication on the value obtained by averaging in the frequency direction, and a power calculator that calculates received signal power based on the value obtained by the conjugate multiplication (25).
  • the receiving apparatus will be described using LTE standardized in 3GPP as an example. Further, the estimated signal received power is referred to as RSRP (Reference Signal Received Power) following LTE. However, the application destination of this embodiment is not limited to LTE.
  • RSRP Reference Signal Received Power
  • FIG. 1 is a block diagram illustrating an example of a configuration of a receiving device provided in an LTE mobile terminal according to the present embodiment.
  • the receiving apparatus 10 includes an RF (Radio Frequency) unit 11, an FFT (Fast Fourier Transform) unit 12, a channel estimation unit 13, RSRP measurement units 20 ⁇ / b> H and 20 ⁇ / b> L, and an RSRP selection unit 30.
  • RF Radio Frequency
  • FFT Fast Fourier Transform
  • the signal received by the receiving antenna of the mobile terminal (UE) is A / D converted in the RF unit 11 and then converted into frequency component data by Fourier transform in the FFT unit 12.
  • the channel estimation unit 13 estimates a channel estimation matrix representing a channel state using a known reference signal (RS: Reference Signal) that is mapped in advance on a frequency resource.
  • RS Reference Signal
  • FIG. 2 is a block diagram showing an example of the configuration of the RSRP measurement unit 20 (RSRP measurement units 20H and 20L in FIG. 1).
  • the RSRP measurement unit 20 includes a measurement period division unit 21, a time direction voltage averaging unit 22, a frequency direction averaging unit 23, a conjugate multiplication unit 24, and a power calculation unit 25.
  • the division number M of the measurement period is different between the RSRP measurement units 20H and 20L.
  • M H, M L is a predetermined constant, satisfying the relation of M H> M L.
  • the start subframe number ST m and the end subframe number ED m are calculated based on the following equations (1) to (3), respectively.
  • the time direction voltage averaging unit 22 performs time axis direction voltage averaging processing of the channel estimation value based on the equation (4) for each measurement period m divided by the measurement period dividing unit 21.
  • Equation (4) a is a receiving antenna, b is a transmitting antenna, n is an index of a subframe in a measurement period, t is an index in the time direction of a reference signal (RS) in the subframe, and i is a reference signal (RS ),
  • the frequency direction index N RST (m) represents the number of symbols including the reference signal (RS) within the measurement period m.
  • the frequency direction averaging unit 23 performs frequency direction averaging processing on the result after the time direction in-phase averaging based on the following equation (5).
  • N RS represents the number of reference signals (RS) included in the band.
  • the conjugate multiplier 24 performs conjugate multiplication processing between adjacent reference signals (RS) based on the following equation (6).
  • the power calculator 25 calculates RSRP based on the following equation (7).
  • the RSRP selection unit 30 refers to the RSRP H and RSRP L measured by the RSRP measurement units 20H and 20L, and reports RSRP L as RSRP if RSRP H ⁇ RSRP L , otherwise Reports RSRP H as RSRP.
  • the receiving device 10 includes two RSRP measurement units 20H and 20L having different measurement period division numbers M.
  • the receiving apparatus may include only one RSRP measuring unit that measures the signal reception power for each of the two voltage average calculation periods instead of the RSRP measuring units 20H and 20L.
  • the first RSRP measurement unit is configured to calculate the first signal based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the first period. Calculate received power, The second RSRP measurement unit is configured to generate the second signal based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the second period. Received power may be calculated.
  • the first RSRP measurement unit and the second RSRP measurement unit are respectively A measurement period dividing unit for dividing the measurement period of the reference signal; A time direction voltage averaging unit that averages the channel estimation value over each of the divided periods; A frequency direction averaging unit that averages values obtained by the averaging in the frequency direction; A conjugate multiplier that performs conjugate multiplication on the value obtained by averaging in the frequency direction; A power calculator that calculates signal reception power based on the value obtained by the conjugate multiplication process.
  • the mobile terminal may include the receiving device.
  • the received power measurement method according to the second aspect is as described above.
  • the mobile terminal calculates the first signal reception power based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the first period.
  • the second received signal power may be calculated based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the second period.
  • the RSRP measurement unit calculates the first signal reception power based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the first period. And calculating the second signal reception power based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the second period. Also good.
  • the RSRP measurement unit A measurement period dividing unit for dividing the measurement period of the reference signal; A time direction voltage averaging unit that averages the channel estimation value over each of the divided periods; A frequency direction averaging unit that averages values obtained by the averaging in the frequency direction; A conjugate multiplier that performs conjugate multiplication on the value obtained by averaging in the frequency direction; A power calculator that calculates signal reception power based on the value obtained by the conjugate multiplication process; May be provided.

Abstract

To enable a reception device provided to a mobile terminal to measure reception power in a highly accurate manner in a high-speed fading environment. A reception device is provided with: a first reference signal reception power (RSRP) measurement unit for measuring a first signal reception power using a value obtained by averaging, over a first period, a channel estimation value estimated on the basis of a known reference signal in an OFDM wireless communication system; a second RSRP measurement unit for measuring a second signal reception power using a value obtained by averaging, over a second period, the channel estimation value; and an RSRP selection unit for comparing the first signal reception power and the second signal reception power and selecting the reception power having a larger value as the result of measuring the signal reception power.

Description

受信装置および受信電力測定方法Receiving apparatus and received power measuring method
　［関連出願についての記載］
　本発明は、日本国特許出願：特願２０１２－０６５２６１号（２０１２年３月２２日出願）に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
　本発明は、受信装置および受信電力測定方法に関し、特に、ＯＦＤＭ（Orthogonal Frequency Division Multiplexing）無線通信システムにおける移動端末に設けられる受信装置、および、受信装置による受信電力測定方法に関する。 [Description of related applications]
The present invention is based on a Japanese patent application: Japanese Patent Application No. 2012-0665261 (filed on Mar. 22, 2012), and the entire contents of this application are incorporated herein by reference.
The present invention relates to a receiving apparatus and a received power measuring method, and more particularly to a receiving apparatus provided in a mobile terminal in an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, and a received power measuring method by the receiving apparatus.
　次世代の通信方式として、３ＧＰＰ（3rd Generation Partnership Project）で標準化されているＬＴＥ（Long Term Evolution）が注目されている。ＬＴＥ等の無線通信システムにおいては、移動端末（ユーザ装置、ＵＥ（User Equipment）ともいう。）から報告された信号受信電力等の受信品質情報に基づいて、基地局間のハンドオーバを行うかどうかが決定される。したがって、適切な基地局へのハンドオーバを実施するためには、移動端末に設けられた受信装置における電力推定精度を向上させることが重要になる。 As a next generation communication method, LTE (Long Term Evolution) standardized by 3GPP (3rd Generation Partnership Project) has attracted attention. In a radio communication system such as LTE, whether or not to perform handover between base stations based on reception quality information such as signal reception power reported from a mobile terminal (also referred to as user equipment, UE (User Equipment)). It is determined. Therefore, in order to carry out a handover to an appropriate base station, it is important to improve the power estimation accuracy in the receiving apparatus provided in the mobile terminal.
　ＯＦＤＭ通信システムにおいて通信路品質を測定する方法は、一例として、特許文献１に記載されている。 A method for measuring channel quality in an OFDM communication system is described in Patent Document 1 as an example.
国際公開第２００６／１０７０３７号International Publication No. 2006/107037
　上記の特許文献の開示を、本書に引用をもって繰り込むものとする。以下の分析は、本発明者によってなされたものである。 The disclosure of the above patent document is incorporated herein by reference. The following analysis was made by the present inventors.
　移動端末に設けられた受信装置は、信号受信電力を算出する際、チャネル推定値を時間方向について電圧平均処理し、さらに周波数方向に平均化した後、隣接するリファレンス信号（ＲＳ：Reference Signal）間で共役乗算を行い、その結果を同相平均した値を用いて信号受信電力を算出する。 When calculating the signal reception power, the receiving device provided in the mobile terminal performs a voltage averaging process on the channel estimation value in the time direction, and further averages in the frequency direction, and then between adjacent reference signals (RS: Reference Signal) Then, conjugate multiplication is performed, and the received signal power is calculated using a value obtained by in-phase averaging the results.
　かかる受信電力算出方法によると、ＳＮＲ（Signal-to-Noise Ratio）が低い環境においても、時間軸方向の電圧平均期間を長くとることで、信号受信電力の精度を向上させることができる。しかし、高速フェージング（fading）環境においては、時間軸方向の電圧平均時間を長くすると、回転成分による誤差のために推定電力が小さくなってしまうという問題がある。 According to this received power calculation method, even in an environment where the SNR (Signal-to-Noise Ratio) is low, the accuracy of the signal received power can be improved by taking a long voltage average period in the time axis direction. However, in a fast fading environment, when the voltage average time in the time axis direction is increased, there is a problem that the estimated power is reduced due to an error due to a rotation component.
　そこで、高速フェージング環境において、移動端末に設けられる受信装置が受信電力を高精度に測定できるようにすることが課題となる。本発明の目的は、かかる課題を解決する受信装置および受信電力測定方法を提供することにある。 Therefore, in a high-speed fading environment, it becomes an issue to enable a receiving device provided in a mobile terminal to measure received power with high accuracy. An object of the present invention is to provide a receiving apparatus and a received power measuring method for solving such a problem.
　本発明の第１の視点に係る受信装置は、
　ＯＦＤＭ（Orthogonal Frequency Division Multiplexing）無線通信システムにおいて、既知のリファレンス信号に基づいて推定したチャネル推定値を、第１の期間に亘って平均化した値を用いて、第１の信号受信電力を測定する第１のリファレンス信号受信電力（ＲＳＲＰ：Reference Signal Received Power）測定部と、
　前記チャネル推定値を第２の期間に亘って平均化した値を用いて、第２の信号受信電力を測定する第２のＲＳＲＰ測定部と、
　前記第１の信号受信電力と前記第２の信号受信電力とを比較して、値の小さくない方を信号受信電力の測定結果として選択するＲＳＲＰ選択部と、を備える。 The receiving apparatus according to the first aspect of the present invention is:
In an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, a first signal reception power is measured using a value obtained by averaging a channel estimation value estimated based on a known reference signal over a first period. A first reference signal received power (RSRP) measurement unit;
A second RSRP measurement unit that measures a second received signal power using a value obtained by averaging the channel estimation value over a second period;
An RSRP selection unit that compares the first signal reception power with the second signal reception power and selects a value not smaller as a measurement result of the signal reception power;
　本発明の第２の視点に係る受信電力測定方法は、
　ＯＦＤＭ（Orthogonal Frequency Division Multiplexing）無線通信システムにおける移動端末による信号受信電力測定方法であって、
　既知のリファレンス信号に基づいて推定したチャネル推定値を第１の期間に亘って平均化した値を用いて、第１の信号受信電力を算出する工程と、
　前記チャネル推定値を第２の期間に亘って平均化した値を用いて、第２の信号受信電力を算出する工程と、
　前記第１の信号受信電力と前記第２の信号受信電力とを比較して、値の小さくない方を信号受信電力の測定結果として選択する工程と、を含む。 The received power measuring method according to the second aspect of the present invention is:
A signal reception power measurement method by a mobile terminal in an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system,
Calculating a first signal reception power using a value obtained by averaging a channel estimation value estimated based on a known reference signal over a first period;
Calculating a second signal reception power using a value obtained by averaging the channel estimation value over a second period;
Comparing the first signal reception power and the second signal reception power and selecting the one having a smaller value as the measurement result of the signal reception power.
　本発明の第３の視点に係る受信装置は、
　ＯＦＤＭ（Orthogonal Frequency Division Multiplexing）無線通信システムにおいて、既知のリファレンス信号に基づいて推定したチャネル推定値を、第１の期間に亘って平均化した値を用いて、第１の信号受信電力を測定するとともに、第２の期間に亘って平均化した値を用いて、第２の信号受信電力を測定するリファレンス信号受信電力（ＲＳＲＰ：Reference Signal Received Power）測定部と、
　前記第１の信号受信電力と前記第２の信号受信電力とを比較して、値の小さくない方を信号受信電力の測定結果として選択するＲＳＲＰ選択部と、を備える。 The receiving apparatus according to the third aspect of the present invention is:
In an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, a first signal reception power is measured using a value obtained by averaging a channel estimation value estimated based on a known reference signal over a first period. And a reference signal received power (RSRP) measuring unit for measuring the second signal received power using a value averaged over the second period;
An RSRP selection unit that compares the first signal reception power with the second signal reception power and selects a value not smaller as a measurement result of the signal reception power;
　本発明に係る受信装置および受信電力測定方法によると、高速フェージング環境において、受信電力を高精度に測定することができる。 According to the receiving apparatus and received power measuring method of the present invention, received power can be measured with high accuracy in a high-speed fading environment.
実施形態に係る受信装置の構成を一例として示すブロック図である。It is a block diagram which shows the structure of the receiver which concerns on embodiment as an example. 実施形態に係る受信装置におけるＲＳＲＰ測定部の構成を一例として示すブロック図である。It is a block diagram which shows the structure of the RSRP measurement part in the receiver which concerns on embodiment as an example.
　はじめに、本発明の概要について説明する。なお、この概要に付記する図面参照符号は、専ら理解を助けるための例示であり、本発明を図示の態様に限定することを意図するものではない。 First, the outline of the present invention will be described. Note that the reference numerals of the drawings attached to this summary are merely examples for facilitating understanding, and are not intended to limit the present invention to the illustrated embodiment.
　高速フェージング環境では、電圧平均処理の平均化期間を長くすると、位相回転によって電力が低い値として測定されてしまう。このような環境においては、電圧平均処理の平均化期間を短くした方が精度良く高い電力として測定される。 In a high-speed fading environment, if the averaging period of the voltage averaging process is lengthened, the power is measured as a low value due to phase rotation. In such an environment, the power is measured with higher accuracy when the averaging period of the voltage averaging process is shortened.
　そこで、本発明では、一例として、全体の測定期間の中で電圧平均を算出する期間をＭＨ個に分割して電力を測定した結果と、ＭＬ個（ＭＨ＞ＭＬ）に分割して電力を測定した結果を比較して、電力が高い方を測定結果として選択する。これにより、高速フェージング環境における電力測定精度を向上させることができる。 Therefore, in the present invention, as an example, the result of measuring the power by dividing the period for calculating the voltage average in the entire measurement period into MH and the result of dividing the measurement into M L (M H > M L ). The results of measuring the power are compared and the higher power is selected as the measurement result. Thereby, the power measurement accuracy in a high-speed fading environment can be improved.
　すなわち、本発明では、電圧平均算出期間を短くして電力を測定した結果と電圧平均算出期間を長くして電力を測定した結果を比較して、高い方の電力を選択することにより、高速フェージング時にも信号受信電力を高精度に推定することが可能となる。 That is, in the present invention, the result of measuring the power with the voltage average calculation period shortened is compared with the result of measuring the power with the voltage average calculation period lengthened, and the higher power is selected. Sometimes it is possible to estimate the received signal power with high accuracy.
　図１を参照すると、受信装置（１０）は、ＯＦＤＭ（Orthogonal Frequency Division Multiplexing）無線通信システムにおいて、既知のリファレンス信号に基づいて推定したチャネル推定値を、第１の期間に亘って平均化した値を用いて、第１の信号受信電力を測定する第１のリファレンス信号受信電力（ＲＳＲＰ：Reference Signal Received Power）測定部（２０Ｈ）と、前記チャネル推定値を第２の期間に亘って平均化した値を用いて、第２の信号受信電力を測定する第２のＲＳＲＰ測定部（２０Ｌ）と、第１の信号受信電力と第２の信号受信電力とを比較して、値の小さくない方を信号受信電力の測定結果として選択するＲＳＲＰ選択部（３０）と、を備えていてもよい。なお、第１の信号受信電力と第２の信号受信電力が等しい場合には、ＲＳＲＰ選択部（３０）は、第１の信号受信電力および第２の信号受信電力のいずれを測定結果としてもよい。 Referring to FIG. 1, a receiving apparatus (10) is a value obtained by averaging channel estimation values estimated based on known reference signals in an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system over a first period. The first reference signal received power (RSRP: Reference Signal Received Power) measuring unit (20H) that measures the first signal received power and the channel estimation value are averaged over a second period Using the value, the second RSRP measurement unit (20L) that measures the second signal reception power is compared with the first signal reception power and the second signal reception power, And an RSRP selection unit (30) that selects as a measurement result of the signal reception power. When the first signal reception power and the second signal reception power are equal, the RSRP selection unit (30) may use either the first signal reception power or the second signal reception power as a measurement result. .
　また、第１のＲＳＲＰ測定部（２０Ｈ）は、前記チャネル推定値を第１の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、第１の信号受信電力を算出し、第２のＲＳＲＰ測定部（２０Ｌ）は、前記チャネル推定値を第２の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、第２の信号受信電力を算出するようにしてもよい。 In addition, the first RSRP measurement unit (20H) performs the first based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over a first period. The second RSRP measurement unit (20L) calculates a signal reception power of the signal, and a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over a second period. Based on the above, the second received signal power may be calculated.
　さらに、図２を参照すると、第１のＲＳＲＰ測定部（２０Ｈ）および第２のＲＳＲＰ測定部（２０Ｌ）は、それぞれ、前記リファレンス信号の測定期間を分割する測定期間分割部（２１）と、前記分割後の期間のそれぞれに亘って前記チャネル推定値を平均化する時間方向電圧平均部（２２）と、前記平均化によって得られた値を周波数方向に平均化する周波数方向平均化部（２３）と、前記周波数方向の平均化によって得られた値に対して共役乗算処理を施す共役乗算部（２４）と、前記共役乗算処理によって得られた値に基づいて信号受信電力を算出する電力計算部（２５）と、を備えていてもよい。 Further, referring to FIG. 2, the first RSRP measurement unit (20H) and the second RSRP measurement unit (20L) each include a measurement period division unit (21) that divides the measurement period of the reference signal, A time direction voltage averaging unit (22) that averages the channel estimation values over each of the divided periods, and a frequency direction averaging unit (23) that averages the values obtained by the averaging in the frequency direction. A conjugate multiplier (24) that performs conjugate multiplication on the value obtained by averaging in the frequency direction, and a power calculator that calculates received signal power based on the value obtained by the conjugate multiplication (25).
　（実施形態）
　実施形態に係る受信装置について、３ＧＰＰにおいて標準化されているＬＴＥを例として説明する。また、推定される信号受信電力を、ＬＴＥにならってＲＳＲＰ（Reference Signal Received Power）と呼ぶ。ただし、本実施形態の適用先は、ＬＴＥに限定されるものではない。 (Embodiment)
The receiving apparatus according to the embodiment will be described using LTE standardized in 3GPP as an example. Further, the estimated signal received power is referred to as RSRP (Reference Signal Received Power) following LTE. However, the application destination of this embodiment is not limited to LTE.
　図１は、本実施形態に係る、ＬＴＥの移動端末に設けられた受信装置の構成を一例として示すブロック図である。図１を参照すると、受信装置１０は、ＲＦ（Radio Frequency）部１１、ＦＦＴ（Fast Fourier Transform）部１２、チャネル推定部１３、ＲＳＲＰ測定部２０Ｈ、２０Ｌ、および、ＲＳＲＰ選択部３０を備えている。 FIG. 1 is a block diagram illustrating an example of a configuration of a receiving device provided in an LTE mobile terminal according to the present embodiment. Referring to FIG. 1, the receiving apparatus 10 includes an RF (Radio Frequency) unit 11, an FFT (Fast Fourier Transform) unit 12, a channel estimation unit 13, RSRP measurement units 20 </ b> H and 20 </ b> L, and an RSRP selection unit 30. .
　移動端末（ＵＥ）の受信アンテナで受信した信号は、ＲＦ部１１においてＡ／Ｄ変換された後、ＦＦＴ部１２においてフーリエ変換により周波数成分のデータに変換される。チャネル推定部１３は、周波数リソース上に予めマッピングされていた既知のリファレンス信号（ＲＳ：Reference Signal）を用いて、チャネル状態を表すチャネル推定行列を推定する。 The signal received by the receiving antenna of the mobile terminal (UE) is A / D converted in the RF unit 11 and then converted into frequency component data by Fourier transform in the FFT unit 12. The channel estimation unit 13 estimates a channel estimation matrix representing a channel state using a known reference signal (RS: Reference Signal) that is mapped in advance on a frequency resource.
　図２は、ＲＳＲＰ測定部２０（図１のＲＳＲＰ測定部２０Ｈ、２０Ｌ）の構成を一例として示すブロック図である。図２を参照すると、ＲＳＲＰ測定部２０は、測定期間分割部２１、時間方向電圧平均部２２、周波数方向平均化部２３、共役乗算部２４、および、電力計算部２５を備えている。 FIG. 2 is a block diagram showing an example of the configuration of the RSRP measurement unit 20 ( RSRP measurement units 20H and 20L in FIG. 1). Referring to FIG. 2, the RSRP measurement unit 20 includes a measurement period division unit 21, a time direction voltage averaging unit 22, a frequency direction averaging unit 23, a conjugate multiplication unit 24, and a power calculation unit 25.
　ＲＳＲＰ測定部２０Ｈと２０Ｌの間では、測定期間の分割数Ｍが異なる。ＲＳＲＰ測定部２０Ｈ、２０Ｌにおける測定期間の分割数を、それぞれＭＨ、ＭＬとする。ここで、ＭＨ、ＭＬは予め決められた定数であり、ＭＨ＞ＭＬの関係を満たす。一例として、ＭＨ＝２、ＭＬ＝１等の値を用いることができる。 The division number M of the measurement period is different between the RSRP measurement units 20H and 20L. RSRP measurement unit 20H, the division number of the measurement period in 20L, respectively M H, and M L. Here, M H, M L is a predetermined constant, satisfying the relation of M H> M L. As an example, values such as M H = 2 and M L = 1 can be used.
　測定期間分割部２１は、測定サブフレームの総数をＮ、測定期間を分割した得られた期間をｍ＝０，１，…，Ｍ－１としたとき、各期間ｍのサブフレーム数Ｌｍ、開始サブフレーム番号ＳＴｍ、および、終了サブフレーム番号ＥＤｍを、それぞれ、以下の式（１）ないし（３）に基づいて算出する。 The measurement period dividing unit 21 assumes that the total number of measurement subframes is N and the periods obtained by dividing the measurement period are m = 0, 1,..., M−1, the number of subframes L m in each period m , The start subframe number ST m and the end subframe number ED m are calculated based on the following equations (1) to (3), respectively.
Figure JPOXMLDOC01-appb-I000007
Figure JPOXMLDOC01-appb-I000007
Figure JPOXMLDOC01-appb-I000008
Figure JPOXMLDOC01-appb-I000008
Figure JPOXMLDOC01-appb-I000009
Figure JPOXMLDOC01-appb-I000009
　一例として、Ｎ＝４，Ｍ＝２とした場合、式（１）ないし（３）より、各期間ｍのサブフレーム数Ｌｍ，開始サブフレーム番号ＳＴｍ，終了サブフレーム番号ＥＤｍ（ｍ＝０，１）は、それぞれ、次の値となる。 For example, when N = 4 and M = 2, the number of subframes L m , start subframe number ST m , end subframe number ED m (m = m = 0,1) are respectively the following values:
Figure JPOXMLDOC01-appb-I000010
Figure JPOXMLDOC01-appb-I000010
　同様に、Ｎ＝１１，Ｍ＝３とした場合には、式（１）ないし（３）より、各期間ｍのサブフレーム数Ｌｍ，開始サブフレーム番号ＳＴｍ，終了サブフレーム番号ＥＤｍ（ｍ＝０，１，２）は、それぞれ、次の値となる。 Similarly, when N = 11, M = 3, the number of subframes L m , the start subframe number ST m , and the end subframe number ED m (for each period m are obtained from equations (1) to (3). m = 0, 1, 2) takes the following values.
Figure JPOXMLDOC01-appb-I000011
Figure JPOXMLDOC01-appb-I000011
　次に、時間方向電圧平均部２２は、測定期間分割部２１で分割した測定期間ｍごとに、式（４）に基づいて、チャネル推定値の時間軸方向電圧平均処理を行う。
Figure JPOXMLDOC01-appb-I000012
Next, the time direction voltage averaging unit 22 performs time axis direction voltage averaging processing of the channel estimation value based on the equation (4) for each measurement period m divided by the measurement period dividing unit 21.
Figure JPOXMLDOC01-appb-I000012
　式（４）において、ａは受信アンテナ、ｂは送信アンテナ、ｎは測定期間内のサブフレームのインデックス、ｔはサブフレーム内のリファレンス信号（ＲＳ）の時間方向のインデックス、ｉはリファレンス信号（ＲＳ）の周波数方向のインデックス、ＮＲＳＴ（ｍ）は測定期間ｍ内のリファレンス信号（ＲＳ）を含むシンボル数を表す。 In Equation (4), a is a receiving antenna, b is a transmitting antenna, n is an index of a subframe in a measurement period, t is an index in the time direction of a reference signal (RS) in the subframe, and i is a reference signal (RS ), The frequency direction index N RST (m) represents the number of symbols including the reference signal (RS) within the measurement period m.
　次に、周波数方向平均化部２３は、時間方向同相平均後の結果に対して、以下の式（５）に基づいて、周波数方向平均化処理を行う。 Next, the frequency direction averaging unit 23 performs frequency direction averaging processing on the result after the time direction in-phase averaging based on the following equation (5).
Figure JPOXMLDOC01-appb-I000013
Figure JPOXMLDOC01-appb-I000013
　式（５）において、ＮＲＳは帯域内に含まれるリファレンス信号（ＲＳ）の数を表す。 In Equation (5), N RS represents the number of reference signals (RS) included in the band.
　次に、共役乗算部２４は、以下の式（６）に基づいて、隣接するリファレンス信号（ＲＳ）間で共役乗算処理を行う。 Next, the conjugate multiplier 24 performs conjugate multiplication processing between adjacent reference signals (RS) based on the following equation (6).
Figure JPOXMLDOC01-appb-I000014
Figure JPOXMLDOC01-appb-I000014
　次に、電力計算部２５は、以下の式（７）に基づいてＲＳＲＰを計算する。 Next, the power calculator 25 calculates RSRP based on the following equation (7).
Figure JPOXMLDOC01-appb-I000015
Figure JPOXMLDOC01-appb-I000015
　次に、ＲＳＲＰ選択部３０は、ＲＳＲＰ測定部２０Ｈ、２０Ｌで測定されたＲＳＲＰＨ、ＲＳＲＰＬを参照し、ＲＳＲＰＨ＜ＲＳＲＰＬの場合にはＲＳＲＰＬをＲＳＲＰとして報告し、それ以外の場合にはＲＳＲＰＨをＲＳＲＰとして報告する。 Next, the RSRP selection unit 30 refers to the RSRP H and RSRP L measured by the RSRP measurement units 20H and 20L, and reports RSRP L as RSRP if RSRP H <RSRP L , otherwise Reports RSRP H as RSRP.
　このとき、高速フェージング環境でＲＳＲＰＬが小さくなった場合には、回転成分の影響が小さいＲＳＲＰＨが選択され、ＲＳＲＰの低下を防ぐことができる。したがって、本実施形態の受信装置によると、高速フェージング環境において、高精度に電力を測定することが可能となる。 At this time, when RSRP L becomes small in the high-speed fading environment, RSRP H having a small influence of the rotation component is selected, and the RSRP can be prevented from being lowered. Therefore, according to the receiving apparatus of this embodiment, power can be measured with high accuracy in a high-speed fading environment.
　本実施形態では、受信装置１０は、互いに測定期間の分割数Ｍが異なる２つのＲＳＲＰ測定部２０Ｈ、２０Ｌを備えている。ただし、受信装置は、ＲＳＲＰ測定部２０Ｈ、２０Ｌの代わりに、２通りの電圧平均算出期間のそれぞれに対する信号受信電力を測定するＲＳＲＰ測定部を１つだけ備えていてもよい。 In the present embodiment, the receiving device 10 includes two RSRP measurement units 20H and 20L having different measurement period division numbers M. However, the receiving apparatus may include only one RSRP measuring unit that measures the signal reception power for each of the two voltage average calculation periods instead of the RSRP measuring units 20H and 20L.
　なお、本発明によると、以下に付記として記載する形態が提供される。
［付記１］
　上記第１の視点に係る受信装置のとおりである。
［付記２］
　前記第１のＲＳＲＰ測定部は、前記チャネル推定値を前記第１の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第１の信号受信電力を算出し、
　前記第２のＲＳＲＰ測定部は、前記チャネル推定値を前記第２の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第２の信号受信電力を算出してもよい。
［付記３］
　前記第１のＲＳＲＰ測定部および前記第２のＲＳＲＰ測定部は、それぞれ、
　前記リファレンス信号の測定期間を分割する測定期間分割部と、
　前記分割後の期間のそれぞれに亘って前記チャネル推定値を平均化する時間方向電圧平均部と、
　前記平均化によって得られた値を周波数方向に平均化する周波数方向平均化部と、
　前記周波数方向の平均化によって得られた値に対して共役乗算処理を施す共役乗算部と、
　前記共役乗算処理によって得られた値に基づいて信号受信電力を算出する電力計算部と、を備えていてもよい。
［付記４］
　前記測定期間分割部は、前記測定期間内のサブフレームの総数をＮ、前記測定期間の分割数をＭとすると、分割後のＭ個の期間のうちの第ｍ（ｍ＝０、１、…、Ｍ－１）の期間のサブフレーム数Ｌｍ、開始サブフレーム番号ＳＴｍおよび終了サブフレーム番号ＥＤｍを、それぞれ、
Figure JPOXMLDOC01-appb-I000016

Figure JPOXMLDOC01-appb-I000017

Figure JPOXMLDOC01-appb-I000018
としてもよい。
［付記５］
　移動端末は、前記受信装置を備えていてもよい。
［付記６］
　上記第２の視点に係る受信電力測定方法のとおりである。
［付記７］
　前記受信電力測定方法において、
　前記移動端末は、前記チャネル推定値を前記第１の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第１の信号受信電力を算出し、
　前記チャネル推定値を前記第２の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第２の信号受信電力を算出してもよい。
［付記８］
　上記第３の視点に係る受信装置のとおりである。
［付記９］
　前記ＲＳＲＰ測定部は、前記チャネル推定値を前記第１の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第１の信号受信電力を算出し、前記チャネル推定値を前記第２の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第２の信号受信電力を算出してもよい。
［付記１０］
　前記ＲＳＲＰ測定部は、
　前記リファレンス信号の測定期間を分割する測定期間分割部と、
　前記分割後の期間のそれぞれに亘って前記チャネル推定値を平均化する時間方向電圧平均部と、
　前記平均化によって得られた値を周波数方向に平均化する周波数方向平均化部と、
　前記周波数方向の平均化によって得られた値に対して共役乗算処理を施す共役乗算部と、
　前記共役乗算処理によって得られた値に基づいて信号受信電力を算出する電力計算部と、
　を備えていてもよい。
［付記１１］
　前記測定期間分割部は、前記測定期間内のサブフレームの総数をＮ、前記測定期間の分割数をＭとすると、分割後のＭ個の期間のうちの第ｍ（ｍ＝０、１、…、Ｍ－１）の期間のサブフレーム数Ｌｍ、開始サブフレーム番号ＳＴｍおよび終了サブフレーム番号ＥＤｍを、それぞれ、
Figure JPOXMLDOC01-appb-I000019

Figure JPOXMLDOC01-appb-I000020

Figure JPOXMLDOC01-appb-I000021
としてもよい。
　なお、上記の特許文献の開示を、本書に引用をもって繰り込むものとする。本発明の全開示（請求の範囲を含む）の枠内において、さらにその基本的技術思想に基づいて、実施形態の変更・調整が可能である。また、本発明の請求の範囲の枠内において種々の開示要素（各請求項の各要素、各実施形態の各要素、各図面の各要素等を含む）の多様な組み合わせ、ないし、選択が可能である。すなわち、本発明は、請求の範囲を含む全開示、技術的思想にしたがって当業者であればなし得るであろう各種変形、修正を含むことは勿論である。特に、本書に記載した数値範囲については、当該範囲内に含まれる任意の数値ないし小範囲が、別段の記載のない場合でも具体的に記載されているものと解釈されるべきである。 In addition, according to this invention, the form described as an appendix below is provided.
[Appendix 1]
This is as the receiving apparatus according to the first aspect.
[Appendix 2]
The first RSRP measurement unit is configured to calculate the first signal based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the first period. Calculate received power,
The second RSRP measurement unit is configured to generate the second signal based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the second period. Received power may be calculated.
[Appendix 3]
The first RSRP measurement unit and the second RSRP measurement unit are respectively
A measurement period dividing unit for dividing the measurement period of the reference signal;
A time direction voltage averaging unit that averages the channel estimation value over each of the divided periods;
A frequency direction averaging unit that averages values obtained by the averaging in the frequency direction;
A conjugate multiplier that performs conjugate multiplication on the value obtained by averaging in the frequency direction;
A power calculator that calculates signal reception power based on the value obtained by the conjugate multiplication process.
[Appendix 4]
The measurement period division unit is assumed that N is the total number of subframes in the measurement period and M is the number of divisions of the measurement period, and m (m = 0, 1,...) Of the M periods after the division. , M−1), subframe number L m , start subframe number ST m and end subframe number ED m are respectively
Figure JPOXMLDOC01-appb-I000016

Figure JPOXMLDOC01-appb-I000017

Figure JPOXMLDOC01-appb-I000018
It is good.
[Appendix 5]
The mobile terminal may include the receiving device.
[Appendix 6]
The received power measurement method according to the second aspect is as described above.
[Appendix 7]
In the received power measurement method,
The mobile terminal calculates the first signal reception power based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the first period. And
The second received signal power may be calculated based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the second period.
[Appendix 8]
This is as the receiving apparatus according to the third aspect.
[Appendix 9]
The RSRP measurement unit calculates the first signal reception power based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the first period. And calculating the second signal reception power based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the second period. Also good.
[Appendix 10]
The RSRP measurement unit
A measurement period dividing unit for dividing the measurement period of the reference signal;
A time direction voltage averaging unit that averages the channel estimation value over each of the divided periods;
A frequency direction averaging unit that averages values obtained by the averaging in the frequency direction;
A conjugate multiplier that performs conjugate multiplication on the value obtained by averaging in the frequency direction;
A power calculator that calculates signal reception power based on the value obtained by the conjugate multiplication process;
May be provided.
[Appendix 11]
When the total number of subframes in the measurement period is N and the number of divisions of the measurement period is M, the measurement period division unit is m-th (M = 0, 1,...) Of the M periods after the division. , M−1), subframe number L m , start subframe number ST m and end subframe number ED m are respectively
Figure JPOXMLDOC01-appb-I000019

Figure JPOXMLDOC01-appb-I000020

Figure JPOXMLDOC01-appb-I000021
It is good.
The disclosure of the above patent document is incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiment can be changed and adjusted based on the basic technical concept. Various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment, each element of each drawing, etc.) are possible within the scope of the claims of the present invention. It is. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea. In particular, with respect to the numerical ranges described in this document, any numerical value or small range included in the range should be construed as being specifically described even if there is no specific description.
１０　　受信装置
１１　　ＲＦ（Radio Frequency）部
１２　　ＦＦＴ（Fast Fourier Transform）部
１３　　チャネル推定部
２０、２０Ｈ、２０Ｌ　　ＲＳＲＰ（Reference Signal Received Power）測定部
２１　　測定期間分割部
２２　　時間方向電圧平均部
２３　　周波数方向平均化部
２４　　共役乗算部
２５　　電力計算部
３０　　ＲＳＲＰ（Reference Signal Received Power）選択部 DESCRIPTION OF SYMBOLS 10 Receiver 11 RF (Radio Frequency) part 12 FFT (Fast Fourier Transform) part 13 Channel estimation part 20, 20H, 20L RSRP (Reference Signal Received Power) measurement part 21 Measurement period division part 22 Time direction voltage average part 23 Frequency direction Averager 24 Conjugate multiplier 25 Power calculator 30 RSRP (Reference Signal Received Power) selector

Claims (11)

  1. 　ＯＦＤＭ（Orthogonal Frequency Division Multiplexing）無線通信システムにおいて、既知のリファレンス信号に基づいて推定したチャネル推定値を、第１の期間に亘って平均化した値を用いて、第１の信号受信電力を測定する第１のリファレンス信号受信電力（ＲＳＲＰ：Reference Signal Received Power）測定部と、
    　前記チャネル推定値を第２の期間に亘って平均化した値を用いて、第２の信号受信電力を測定する第２のＲＳＲＰ測定部と、
    　前記第１の信号受信電力と前記第２の信号受信電力とを比較して、値の小さくない方を信号受信電力の測定結果として選択するＲＳＲＰ選択部と、
    　を備える、受信装置。     In an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, a first signal reception power is measured using a value obtained by averaging a channel estimation value estimated based on a known reference signal over a first period. A first reference signal received power (RSRP) measurement unit;
    A second RSRP measurement unit that measures a second received signal power using a value obtained by averaging the channel estimation value over a second period;
    An RSRP selection unit that compares the first signal reception power and the second signal reception power and selects a value not smaller as a measurement result of the signal reception power;
    A receiving device.
  2. 　前記第１のＲＳＲＰ測定部は、前記チャネル推定値を前記第１の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第１の信号受信電力を算出し、
    　前記第２のＲＳＲＰ測定部は、前記チャネル推定値を前記第２の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第２の信号受信電力を算出する、
    　請求項１に記載の受信装置。     The first RSRP measurement unit is configured to calculate the first signal based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the first period. Calculate received power,
    The second RSRP measurement unit is configured to generate the second signal based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the second period. Calculate received power,
    The receiving device according to claim 1.
  3. 　前記第１のＲＳＲＰ測定部および前記第２のＲＳＲＰ測定部は、それぞれ、
    　前記リファレンス信号の測定期間を分割する測定期間分割部と、
    　前記分割後の期間のそれぞれに亘って前記チャネル推定値を平均化する時間方向電圧平均部と、
    　前記平均化によって得られた値を周波数方向に平均化する周波数方向平均化部と、
    　前記周波数方向の平均化によって得られた値に対して共役乗算処理を施す共役乗算部と、
    　前記共役乗算処理によって得られた値に基づいて信号受信電力を算出する電力計算部と、
    　を備える、
    　請求項２に記載の受信装置。     The first RSRP measurement unit and the second RSRP measurement unit are respectively
    A measurement period dividing unit for dividing the measurement period of the reference signal;
    A time direction voltage averaging unit that averages the channel estimation value over each of the divided periods;
    A frequency direction averaging unit that averages values obtained by the averaging in the frequency direction;
    A conjugate multiplier that performs conjugate multiplication on the value obtained by averaging in the frequency direction;
    A power calculator that calculates signal reception power based on the value obtained by the conjugate multiplication process;
    Comprising
    The receiving device according to claim 2.
  4. 　前記測定期間分割部は、前記測定期間内のサブフレームの総数をＮ、前記測定期間の分割数をＭとすると、分割後のＭ個の期間のうちの第ｍ（ｍ＝０、１、…、Ｍ－１）の期間のサブフレーム数Ｌｍ、開始サブフレーム番号ＳＴｍおよび終了サブフレーム番号ＥＤｍを、それぞれ、

    Figure JPOXMLDOC01-appb-I000001

    Figure JPOXMLDOC01-appb-I000002

    Figure JPOXMLDOC01-appb-I000003

    とする、
    　請求項３に記載の受信装置。     The measurement period division unit is assumed that N is the total number of subframes in the measurement period and M is the number of divisions of the measurement period, and m (m = 0, 1,...) Of the M periods after the division. , M−1), subframe number L m , start subframe number ST m and end subframe number ED m are respectively

    Figure JPOXMLDOC01-appb-I000001

    Figure JPOXMLDOC01-appb-I000002

    Figure JPOXMLDOC01-appb-I000003

    And
    The receiving device according to claim 3.
  5. 　請求項１ないし４のいずれか１項に記載の受信装置を備える、移動端末。 A mobile terminal comprising the receiving device according to any one of claims 1 to 4.
  6. 　ＯＦＤＭ（Orthogonal Frequency Division Multiplexing）無線通信システムにおける移動端末による信号受信電力測定方法であって、
    　前記移動端末が、既知のリファレンス信号に基づいて推定したチャネル推定値を第１の期間に亘って平均化した値を用いて、第１の信号受信電力を算出する工程と、
    　前記チャネル推定値を第２の期間に亘って平均化した値を用いて、第２の信号受信電力を算出する工程と、
    　前記第１の信号受信電力と前記第２の信号受信電力とを比較して、値の小さくない方を信号受信電力の測定結果として選択する工程と、
    　を含む、受信電力測定方法。     A signal reception power measurement method by a mobile terminal in an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system,
    Calculating a first signal received power using a value obtained by averaging the channel estimation value estimated based on a known reference signal over a first period by the mobile terminal;
    Calculating a second signal reception power using a value obtained by averaging the channel estimation value over a second period;
    Comparing the first signal received power and the second signal received power, and selecting the smaller one as the measurement result of the signal received power;
    A received power measuring method including:
  7. 　前記移動端末は、前記チャネル推定値を前記第１の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第１の信号受信電力を算出し、
    　前記チャネル推定値を前記第２の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第２の信号受信電力を算出する、
    　請求項６に記載の受信電力測定方法。     The mobile terminal calculates the first signal reception power based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the first period. And
    Calculating the second signal reception power based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the second period;
    The received power measuring method according to claim 6.
  8. 　ＯＦＤＭ（Orthogonal Frequency Division Multiplexing）無線通信システムにおいて、既知のリファレンス信号に基づいて推定したチャネル推定値を、第１の期間に亘って平均化した値を用いて、第１の信号受信電力を測定するとともに、第２の期間に亘って平均化した値を用いて、第２の信号受信電力を測定するリファレンス信号受信電力（ＲＳＲＰ：Reference Signal Received Power）測定部と、
    　前記第１の信号受信電力と前記第２の信号受信電力とを比較して、値の小さくない方を信号受信電力の測定結果として選択するＲＳＲＰ選択部と、
    　を備える、受信装置。     In an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, a first signal reception power is measured using a value obtained by averaging a channel estimation value estimated based on a known reference signal over a first period. And a reference signal received power (RSRP) measuring unit for measuring the second signal received power using a value averaged over the second period;
    An RSRP selection unit that compares the first signal reception power and the second signal reception power and selects a value not smaller as a measurement result of the signal reception power;
    A receiving device.
  9. 　前記ＲＳＲＰ測定部は、前記チャネル推定値を前記第１の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第１の信号受信電力を算出し、前記チャネル推定値を前記第２の期間に亘って平均化した値に対して、周波数方向平均化および共役乗算を施した値に基づいて、前記第２の信号受信電力を算出する、
    　請求項８に記載の受信装置。     The RSRP measurement unit calculates the first signal reception power based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by averaging the channel estimation value over the first period. Calculating the second signal received power based on a value obtained by performing frequency direction averaging and conjugate multiplication on a value obtained by calculating and averaging the channel estimation value over the second period;
    The receiving device according to claim 8.
  10. 　前記ＲＳＲＰ測定部は、
    　前記リファレンス信号の測定期間を分割する測定期間分割部と、
    　前記分割後の期間のそれぞれに亘って前記チャネル推定値を平均化する時間方向電圧平均部と、
    　前記平均化によって得られた値を周波数方向に平均化する周波数方向平均化部と、
    　前記周波数方向の平均化によって得られた値に対して共役乗算処理を施す共役乗算部と、
    　前記共役乗算処理によって得られた値に基づいて信号受信電力を算出する電力計算部と、
    　を備える、
    　請求項９に記載の受信装置。     The RSRP measurement unit
    A measurement period dividing unit for dividing the measurement period of the reference signal;
    A time direction voltage averaging unit that averages the channel estimation value over each of the divided periods;
    A frequency direction averaging unit that averages values obtained by the averaging in the frequency direction;
    A conjugate multiplier that performs conjugate multiplication on the value obtained by averaging in the frequency direction;
    A power calculator that calculates signal reception power based on the value obtained by the conjugate multiplication process;
    Comprising
    The receiving device according to claim 9.
  11. 　前記測定期間分割部は、前記測定期間内のサブフレームの総数をＮ、前記測定期間の分割数をＭとすると、分割後のＭ個の期間のうちの第ｍ（ｍ＝０、１、…、Ｍ－１）の期間のサブフレーム数Ｌｍ、開始サブフレーム番号ＳＴｍおよび終了サブフレーム番号ＥＤｍを、それぞれ、

    Figure JPOXMLDOC01-appb-I000004

    Figure JPOXMLDOC01-appb-I000005

    Figure JPOXMLDOC01-appb-I000006

    とする、
    　請求項１０に記載の受信装置。     The measurement period division unit is assumed that N is the total number of subframes in the measurement period and M is the number of divisions of the measurement period, and m (m = 0, 1,...) Of the M periods after the division. , M−1), subframe number L m , start subframe number ST m and end subframe number ED m are respectively

    Figure JPOXMLDOC01-appb-I000004

    Figure JPOXMLDOC01-appb-I000005

    Figure JPOXMLDOC01-appb-I000006

    And
    The receiving device according to claim 10.
PCT/JP2013/058109 2012-03-22 2013-03-21 Reception device and reception power measurement method WO2013141307A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-065261 2012-03-22
JP2012065261 2012-03-22

Publications (1)

Publication Number Publication Date
WO2013141307A1 true WO2013141307A1 (en) 2013-09-26

Family

ID=49222763

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/058109 WO2013141307A1 (en) 2012-03-22 2013-03-21 Reception device and reception power measurement method

Country Status (1)

Country Link
WO (1) WO2013141307A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015131393A1 (en) * 2014-03-07 2015-09-11 Telefonaktiebolaget L M Ericsson (Publ) Method and device for calculating reference signal received power

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009057520A1 (en) * 2007-11-02 2009-05-07 Ntt Docomo, Inc. User device and signal power measuring method
WO2009057481A1 (en) * 2007-10-30 2009-05-07 Ntt Docomo, Inc. User device and signal electric power measurement method
US20100279638A1 (en) * 2009-04-30 2010-11-04 Telefonaktiebolaget L M Ericsson (Publ) Adaptive Idle Mode Measurement Methods and Apparatus
EP2341647A1 (en) * 2009-12-30 2011-07-06 ST-Ericsson SA Method for computing the receive power of a non serving cell, and receiver for doing the same
WO2012133691A1 (en) * 2011-03-30 2012-10-04 Ｎｅｃカシオモバイルコミュニケーションズ株式会社 Receiving device, receiving method, and computer program

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009057481A1 (en) * 2007-10-30 2009-05-07 Ntt Docomo, Inc. User device and signal electric power measurement method
WO2009057520A1 (en) * 2007-11-02 2009-05-07 Ntt Docomo, Inc. User device and signal power measuring method
US20100279638A1 (en) * 2009-04-30 2010-11-04 Telefonaktiebolaget L M Ericsson (Publ) Adaptive Idle Mode Measurement Methods and Apparatus
EP2341647A1 (en) * 2009-12-30 2011-07-06 ST-Ericsson SA Method for computing the receive power of a non serving cell, and receiver for doing the same
WO2012133691A1 (en) * 2011-03-30 2012-10-04 Ｎｅｃカシオモバイルコミュニケーションズ株式会社 Receiving device, receiving method, and computer program

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015131393A1 (en) * 2014-03-07 2015-09-11 Telefonaktiebolaget L M Ericsson (Publ) Method and device for calculating reference signal received power

Similar Documents

Publication Publication Date Title
CN106972915B (en) Signal transmission method and narrow-band wireless terminal
US8248997B2 (en) Apparatus and method for positioning a wireless user equipment
CN107113771B (en) OTDOA (observed time difference of arrival) positioning enhancement using heterogeneous reference signals
US8447327B2 (en) Method and apparatus for a buffering scheme for OTDOA based location positioning
US20140070996A1 (en) Method and apparatus for facilitating direction finding
CN110138469B (en) Mobile terminal and method for measuring channel state information measurement reference signal thereof
EP2549812A1 (en) RF Fingerprinting for Location Estimate
EP3552443B1 (en) Methods and apparatus for reporting rstd values
EP2897406A1 (en) Interference measurement method, base station and user equipment
CN110073605B (en) Wireless communication method and device
RU2014150510A (en) METHODS AND DEVICES FOR DETERMINING THE ASSESSMENT OF SIGNAL POWER BY MEASURING ZOOM
US9614700B2 (en) Techniques for channel estimation in millimeter-wave communication systems
CN103856306A (en) Interference processing method and device
CN106533820B (en) The method, apparatus and user equipment of cell measurement
CN108541061A (en) The method and apparatus of enhancing reference signal time difference for LTE positioning
WO2016165508A1 (en) Signal processing method, uplink resource allocation method and device thereof
CN102918787A (en) Receiver and method of estimating signal to noise power ratio
EP3054719A1 (en) Signal measurement method, user equipment, and base station
WO2015159616A1 (en) Estimation apparatus and program
CN113037590B (en) Time delay estimation method and device used in communication system
JP5366954B2 (en) Mobile station and mobile communication method
WO2013141307A1 (en) Reception device and reception power measurement method
WO2014006961A1 (en) Fading doppler frequency estimation device and fading doppler frequency estimation method
CN102783108A (en) Method and apparatus for estimating a Doppler frequency
CA2679591A1 (en) Determining per sector received power level

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13764711

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13764711

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP