WO2009157534A1 - 閉ループ送信電力制御方法及び基地局装置、端末装置 - Google Patents
閉ループ送信電力制御方法及び基地局装置、端末装置 Download PDFInfo
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- WO2009157534A1 WO2009157534A1 PCT/JP2009/061695 JP2009061695W WO2009157534A1 WO 2009157534 A1 WO2009157534 A1 WO 2009157534A1 JP 2009061695 W JP2009061695 W JP 2009061695W WO 2009157534 A1 WO2009157534 A1 WO 2009157534A1
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- 230000003044 adaptive effect Effects 0.000 description 6
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/06—TPC algorithms
- H04W52/08—Closed loop power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
Definitions
- the present invention relates to a closed loop transmission power control method, a base station apparatus, and a terminal apparatus suitable for a fixed rate channel such as a control channel.
- an uplink signal transmitted from a mobile station apparatus (UE: User equipment) existing in the same cell is multiplied by a user-specific scramble code, Uplink received signals are non-orthogonal between UEs in the same cell. Therefore, in order to reduce the influence of multi-user interference (that is, the perspective problem), high-speed transmission power control (TPC: “Transmission” Power “Control”) is essential.
- UE User equipment
- TPC Transmission” Power “Control”
- LTE Long-8 Evolution LTE
- Rel-8 LTE Long-8 Evolution LTE
- PAPR Peak-to Average Power Ratio
- SC-FDMA Single-Carrier Frequency Division Multiple Access
- TPC is not always essential from the viewpoint of suppressing multiuser interference in the same cell.
- Rel-8 LTE is based on one-cell frequency repetition using the same frequency in all cells, the same cell interference from neighboring cells is large, and especially UEs existing at the cell edge receive from UEs in other cells. The interference level is high. For this reason, in order to compensate for such neighboring cell interference and maintain a constant reception quality, it is necessary to apply TPC also in LTE.
- PRACH Physical Random Access Channel
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- PUSCH is a physical channel that transmits user data, and adaptive modulation and channel coding (AMC: Adaptive Modulation and channel Coding) according to the reception channel state of UE and adaptive TPC are applied.
- AMC adaptive modulation and channel coding
- compensation for path loss and shadowing fluctuation is handled by using adaptive TPC (open loop TPC), and instantaneous fading fluctuation is dealt with by adaptive rate control by AMC.
- PUCCH transmits control information (typically, downlink reception channel quality (CQI: Channel Quality Indicator) information, downlink acknowledgment (ACK: Acknowledgement) / non-acknowledgement (NACK: negative ACK), etc.)
- control information typically, downlink reception channel quality (CQI: Channel Quality Indicator) information, downlink acknowledgment (ACK: Acknowledgement) / non-acknowledgement (NACK: negative ACK), etc.
- CQI Channel Quality Indicator
- ACK Acknowledgement
- NACK negative ACK
- FIG. 2 is a configuration diagram of PUCCH in the uplink of Rel-8 LTE.
- PUCCH uses a radio resource having a narrow bandwidth (180 kHz) in order to achieve both transmission at any time and low overhead.
- a 1 msec subframe is composed of two 0.5 msec slots.
- the frequency diversity gain is generally reduced.
- frequency hopping that uses two slots in one subframe and hops between bands at both ends of the transmission spectrum, A large frequency diversity effect can be obtained.
- Transmission bands RB1 and RB2 are allocated to the bands at both ends of the transmission spectrum to be frequency hopped, UE1 causes frequency hopping between slot 1 of RB1 and slot 2 of RB2, and UE2 performs slot 1 of RB2 and slot 2 of RB1. Frequency hopping between.
- the transmission bands RB1 and RB2 can also be called resource blocks (RB).
- RB resource blocks
- multiple mobile station apparatuses to which frequency hopping using the same radio resource is applied are orthogonalized by code multiplexing.
- Fig. 5 is a conceptual diagram of closed-loop TPC for PUCCH specified in Rel-8 LTE.
- a mode in which CQI information is transmitted periodically (TCQI) on PUCCH is defined.
- the base station measures the uplink received channel quality (SINR) using a channel estimation reference signal (RS: Reference Signal) transmitted on the PUCCH.
- RS Reference Signal
- the reception SINR and the target reception level are compared, and TPC command bits for controlling the transmission power are generated so that the reception quality is constant.
- the base station generates a TPC command bit at a certain period (TTPC) and transmits it to the mobile station.
- the transmission power of PUCCH is adjusted according to the received TPC command bit. In this way, an uplink closed loop TPC is realized.
- FIG. 6 is a conceptual diagram of the TPC method (referred to as “RB common TPC method” in this specification) for PUCCH in Rel-8 LTE.
- the received SINR is measured in each of RB1 and RB2 of the PUCCH to be frequency hopped, and the measured received SINR is averaged between RB1 and RB2 to obtain an average received SINR.
- Closed loop control is performed by transmitting TPC command bits to the UE so that the average received SINR matches the target SINR value.
- the RB common TPC method is a method in which the UE performs common power control between RBs so that the average received SINR of the two RBs 1 and 2 used for frequency hopping matches the target SINR value.
- the power is adjusted to the same (identical) power for RB1 and RB2, but is subjected to frequency selective fading in the channel propagation path between the mobile station and the base station.
- the reception SINR at has different reception levels between RB1 and RB2.
- the average received SINR of RB1 and RB2 matches the target SINR, but RB1 is received with an excess quality that exceeds the target value, while RB2 is less than the target value. It shows the quality being received.
- the present invention has been made in view of such points, and a closed-loop transmission power control method and a base station apparatus capable of realizing constant reception quality for all RBs without applying another technique for each RB in the closed-loop TPC,
- An object is to provide a terminal device.
- a signal hopped to one of a plurality of frequency bands is received from a terminal device every predetermined time unit, and the quality of the signal received from the terminal device is hopped.
- Transmission power control information is generated separately for each frequency band, and transmission power control information generated separately for each frequency band is transmitted to the terminal apparatus.
- the transmission power control method of the present invention receives a signal hopped to one of a plurality of frequency bands from a terminal device every predetermined time unit, and measures the quality of the received signal for each time unit.
- the difference between the quality of only the measurement signal and the target quality causes the terminal device to Transmission power control information indicating the amount of uplink transmission power to be increased or decreased is generated, and the generated transmission power control information is transmitted to the terminal device.
- the quality of each signal matches the target quality more accurately than when averaging the signal quality of different frequency bands And high quality reception can be realized.
- the transmission power control method of the present invention is the time average of the measured quality when the measurement signal to be measured and any adjacent signal that is temporally adjacent are hopped in the same frequency band.
- transmission power control information indicating the amount of uplink transmission power to be increased / decreased in the terminal device due to the difference from the target quality, and the measurement signal to be measured is any one of the time difference When the adjacent signal is hopped to a different frequency band, only the measurement signal is used as a basis for generating transmission power control information.
- the frequency when the measurement signal and any adjacent signal that precedes and follows in time are hopped in the same frequency band, and the measurement signal and any adjacent signal that precedes and follows in time differ. High-quality reception can be realized by the case where the band is hopped.
- the present invention in the closed-loop TPC, it is possible to realize high-quality reception for all RBs without applying another technique for each RB.
- a transmission power control method according to the present embodiment will be described with reference to FIG.
- a PUCCH shown in FIG. 2 will be described as an example of a channel that is subjected to closed-loop transmission power control in the uplink defined in Rel-8 LTE.
- the present invention is not limited to an uplink fixed rate channel to which frequency hopping is applied, and can also be applied to channels other than PUCCH.
- Rel-8 LTE uplink PUCCH is a channel for transmitting control information (typically CQI, ACK, NACK).
- One subframe is composed of two slots 1 and 2. Frequency hopping using bands (RB1, RB2) at both ends of the transmission spectrum is applied to slot 1 and slot 2.
- the base station measures the received SINR using the RS in the PUCCH that periodically transmits CQI information.
- the received SINR and the target SINR are compared, and a TPC command bit for adjusting the transmission power of the PUCCH is generated according to the comparison result.
- the generated TPC command bit for transmission power of PUCCH is feedback-transmitted from the opposite link to the mobile station apparatus.
- the mobile station apparatus controls the transmission power of the PUCCH based on the TPC command bit received on the downlink. This realizes a closed loop TPC of PUCCH that transmits CQI.
- the received SINR is calculated for each RB, and each received SINR is independently determined between RB1 and RB2.
- the TPC command bits thus obtained individually for RB1 and RB2 are fed back in the downlink (hereinafter referred to as “RB independent TPC method”). That is, in the RB independent TPC method, the received SINRs of RB1 and RB2 in different frequency bands are not averaged, but the TPC command bit (RB1) for matching the received SINR of RB1 with the target SINR value and the received SINR of RB2.
- TPC command bits (RB2) that match the target SINR value are generated and transmitted to the UE.
- the UE controls the transmission power of the corresponding RB 1 and 2 with the TPC command bits (RB 1 and RB 2) designated for each RB.
- the present invention described above receives a signal hopped in any of a plurality of frequency bands for each predetermined time unit, measures the received SINR for each time unit as the quality of the received signal, In the case where the measured signal that has become hopped in a different frequency band from any adjacent signal that fluctuates in time, it can be said that only the measured signal is used as a basis for generating the TPC command bits.
- the present invention described above receives a signal hopped in any of a plurality of frequency bands for each predetermined time unit, measures the received SINR for each time unit as the quality of the received signal, If the measured signal and any adjacent signal that fluctuates in time are hopped to the same frequency band, the terminal device should increase or decrease due to the difference between the measured quality time average and the target quality.
- An aspect of generating transmission power control information indicating the amount of uplink transmission power may be included. That is, it is applicable not to frequency hopping in units of slots but to frequency hopping in units of subframes.
- a control signal is transmitted using two adjacent slots 1 and 2 in RB1 in a certain subframe, and then other CQI information is transmitted.
- frequency hopping is performed so that the control signal is transmitted by using two adjacent slots 1 and 2 in RB2.
- the measurement signal (slot 1) that is the object of measurement and any adjacent signal (slot 2) that fluctuates in time are hopped to the same frequency band (for example, R1).
- band (R1) transmission power control information indicating the amount of uplink transmission power to be increased or decreased in the terminal device is determined based on the difference between the measured quality time average (slot 1 + slot 2) and the target quality. .
- the transmission power control information is similarly determined for the other frequency band (R1).
- FIG. 3 is a functional block diagram of a transmitter and a receiver of the mobile station apparatus (UE)
- FIG. 4 is a functional block diagram of a transmitter and a receiver of the base station apparatus.
- the transmission unit of the mobile station apparatus includes a processing block 11 for transmitting CQI information as one of control information, a processing block 12 for transmitting RS, and a multiplexing unit 13 for multiplexing CQI information on RS. And a power amplifying unit 14 that controls transmission power of each RB 1 and 2 used for frequency hopping of the multiplexed signal.
- the channel coding unit 21 performs channel coding on CQI information (CQI bit sequence), which is reception quality information estimated based on the RS received in the downlink in the receiving unit.
- CQI information CQI bit sequence
- the channel-coded CQI information is modulated by the data modulation unit 22 using a predetermined modulation method, and then supplied to the subcarrier mapping unit 23.
- the subcarrier mapping unit 23 frequency hops CQI information between RB1 and RB2 in slot units based on the resource block number. For example, hopping is performed between slot 1 of RB1 and slot 2 of RB2.
- the IFFT unit 24 performs fast inverse Fourier transform (Inverse Fast Fourier Transform) on the output signal of the subcarrier mapping unit 23 to generate a time-axis waveform signal, which is given a guard interval by the CP assigning unit 25 and then output to the multiplexing unit 13 .
- Fast inverse Fourier transform Inverse Fast Fourier Transform
- the resource block number and the sequence number decoded from the control signal received in the downlink in the receiving unit are captured.
- An RS sequence generating unit 31 generates an RS based on the sequence number.
- the subcarrier mapping unit 32 performs frequency hopping of the RS into RB1 and RB2 on a slot basis based on the resource block number.
- the IFFT unit 33 performs fast inverse Fourier transform on the output signal of the subcarrier mapping unit 32 to obtain a time-axis waveform signal.
- the CP applying unit 34 assigns a guard interval and then outputs the signal to the multiplexing unit 13.
- the CQI information output from the CQI information processing block 11 and the RS output from the RS processing block 12 are multiplexed in the multiplexing unit 13.
- the power amplification unit 14 controls the transmission power of the multiplexed signal of CQI information and RS output from the multiplexing unit 13 independently by the two RB1 and RB2.
- the TPC command information decoded in the receiving unit includes TPC commands for RB1 and RB2 in which slot 1 and slot 2 are mapped by the subcarrier mapping units 23 and 32, respectively.
- the power amplifying unit 14 amplifies the signal with the transmission power indicated by the TPC command independently of RB1 and RB2. In this way, the transmission signal whose transmission power is controlled independently for each of RB1 and RB2 is wirelessly transmitted from the transmission radio.
- the RS is separated from the received signal in which the CQI information and the RS are multiplexed.
- the separated RS is used for synchronization detection in the synchronization detection / channel estimation / reception quality measurement unit 51, and further, the received RS and the known signal (RS transmission replica) are compared to perform channel estimation. Further, the received SINR (RB1) and the received SINR (RB2) are measured for each of RB1 and RB2 based on the resource block number.
- the TPC command information generation unit 52 takes in the received SINRs of RB1 and RB2 and compares them with the target SINR value.
- a TPC command bit (RB1) for RB1 that matches the received SINR (RB1) with the target SINR value is generated.
- a TPC command command (RB2) for RB2 that matches the received SINR (RB2) with the target SINR value is generated.
- the TPC command bit indicating the amount of uplink transmission power to be increased or decreased in the mobile station is generated based on the difference between the received SINR and the target SINR.
- TPC command bits that match the received SINR of each RB used for frequency hopping with the target SINR value are independently generated for each RB.
- the received signal is subjected to the guard interval removal by the CP removal unit 53 based on the timing detected by the synchronization detection / channel estimation / reception quality measurement unit 51, the FFT unit 54 performs fast Fourier transform, and then the subcarrier demapping unit At 55, control information (CQI information) mapped to RB1 and RB2 is demapped based on the resource block number.
- the demapped CQI information is demodulated by the data demodulator 56 and further decoded by the data decoder 57.
- the TPC command (RB 1) and the TPC command (RB 2) generated independently for each RB as described above use an uplink TPC command transmission control channel (TPC-PDCCH) 61 to generate an OFDM signal generator 63. After being converted into an OFDM signal, the signal is transmitted to the mobile station apparatus (UE) in the downlink. Further, the uplink resource allocation information signal generation unit (UL grant) 62 generates uplink resource allocation information, and is transmitted using both TPC-PDCCH and UL grant by including TPC command information in the uplink resource allocation information signal. You can also
- the received signal received from the base station apparatus is demodulated by the OFDM demodulator 41, the TPC command bit information is output to the TPC command bit information demodulator / decoder 42, and the RS is output to the CQI estimator 43.
- the broadcast channel and the downlink control signal are output to the decoding unit 44.
- the broadcast channel and downlink control signal decoding unit 44 decodes the broadcast channel or downlink control signal of the received signal to obtain a sequence number and a resource block number.
- the sequence number is given to the RS sequence generation unit 31, and the resource block number is given to the subcarrier mapping units 23 and 32.
- the TPC command information demodulation / decoding unit 42 demodulates and decodes the TPC command (RB1) and TPC command (RB2) generated independently for each RB via TPC-PDCCH or UL grant, It is given as TPC command information.
- the power amplifying unit 14 controls transmission power based on the TPC command generated independently for each RB. In this way, a closed loop TPC is realized.
- PUCCH is assigned to RB1 for transmission to UE1, and RB2 is assigned to transmission to UE2. Focusing on UE1, control information is transmitted using slot 1 and slot 2 of RB1.
- the TPC command bit is not an average of the received SINRs of RB1 and RB2, but is a value obtained by averaging the one subframe of RB1 (for two slots) in the same phase.
- a TPC command is generated for each RB to match the reception SINR obtained by in-phase averaging of one subframe (for two slots) with the target SINR, and an independent closed-loop TPC is performed between the RBs.
- the channel estimation accuracy and the reception SINR measurement accuracy used for the closed-loop TPC can be improved by using the in-phase addition average of two slots constituting one subframe in the time domain, and the overall PUCCH information can be improved. Quality reception and high-precision closed-loop TPC can be realized.
- FIG. 7 shows functional blocks of the mobile station apparatus in which processing blocks for orthogonalizing uplink control information (CQI information, RS) between users in the same cell are shown.
- FIG. 8 shows the movement shown in FIG. The functional block of the base station apparatus corresponding to a station apparatus is shown.
- the uplink resource allocation information signal generation unit 62 in the transmission unit of the base station apparatus includes a sequence number indicating the start position of a CAZAC (Constant Amplitude Zero Auto-Correlation) sequence, a cyclic shift number indicating a shift amount, And a resource block number indicating a radio resource allocated to the mobile station apparatus.
- the base station apparatus allocates different cyclic shifts for each mobile station apparatus to the same CAZAC sequence in order to orthogonalize and multiplex uplink control signals of mobile station apparatuses existing in the same cell to be managed ( That is, code multiplexing).
- the base station apparatus generates a common sequence number among users and a different cyclic shift number for each user and notifies the mobile station apparatuses existing in the same cell to be managed in the downlink.
- a Zadoff-Chu sequence may be used as the CAZAC sequence.
- the broadcast channel / downlink control signal decoding unit 44 in the receiving unit of the mobile station apparatus decodes a control signal including a sequence number, a resource block number, and a cyclic shift number from the downlink OFDM demodulated signal. .
- the transmitter of the mobile station apparatus generates a CAZAC sequence signal based on the sequence number notified from the base station apparatus, and a CAZAC sequence signal generated by the CAZAC sequence generator according to the cyclic shift number.
- the CQI information transmitted by this mobile station apparatus in the uplink is encoded into an orthogonalized signal in relation to other mobile station apparatuses.
- the transmission unit of the mobile station apparatus includes a cyclic shift unit 35 that shifts the RS sequence signal generated by the RS sequence generation unit 31 according to the cyclic shift number.
- the RS transmitted by the mobile station apparatus in the uplink is encoded into an orthogonalized signal in relation to other mobile station apparatuses.
- control signals (CQI, RS) are orthogonally multiplexed between other users in the mobile station apparatus, they are transmitted with frequency hopping in the uplink.
- the receiving unit of the base station apparatus includes a cyclic shift separation unit 58 that receives a signal (CQI information) returned to the frequency domain by the FFT unit 54 and separates the CQI information from the signal based on the cyclic shift number. Since the cyclic shift number is assigned a different value for each user, it is possible to extract CQI information received from each user by performing signal separation using the cyclic shift number assigned to the user.
- the receiving unit of the base station apparatus includes a channel compensating unit 59 that returns (compensates) channel fluctuation received by the mobile station apparatus-base station apparatus building based on the channel estimation value estimated using the RS. After subcarrier demapping, the channel fluctuation received by the mobile station apparatus-base station apparatus building is compensated and then passed to the data demodulation unit 56.
- the present invention is applicable to a closed-loop transmission power control method in uplink PUCCH of Rel-8 LTE.
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Abstract
Description
PUCCHは、いつでも送信可能であること、及び低オーバヘッドであること、を両立するため、狭い帯域幅(180kHz)の無線リソースが用いられている。また、1msecのサブフレームは0.5 msecの2つのスロットで構成されている。狭い送信帯域幅を用いた場合、一般的には周波数ダイバーシチ利得が減少するが,1サブフレーム内の2つのスロットを利用し送信スペクトラムの両端の帯域間でホッピングさせる周波数ホッピングを適用することで、大きな周波数ダイバーシチ効果を得ることができる。周波数ホッピングされる送信スペクトラム両端の帯域に送信帯域RB1、2を割り付け、UE1はRB1のスロット1とRB2のスロット2との間で周波数ホッピングさせ、UE2はRB2のスロット1とRB1のスロット2との間で周波数ホッピングされる。送信帯域RB1、2はリソースブロック(RB: Resource Block)と呼ぶこともできる。さらに、同一の無線リソースを用いた周波数ホッピングが適用される複数移動局装置は、コード多重によって、直交化される。
図1を参照して本実施の形態に係る送信電力制御方法について説明する。Rel-8 LTEに規定された上りリンクにおいて閉ループ送信電力制御されるチャネルとして図2に示すPUCCHを例に説明する。但し、本発明は周波数ホッピングが適用された上りリンクの固定レートチャネルに限定されるものではなく、PUCCH以外のチャネルにも適用可能である。
図3は移動局装置(UE)の送信部及び受信部の機能ブロック図であり、図4は基地局装置の送信部及び受信部の機能ブロック図である。
Claims (8)
- 複数の周波数帯のいずれかにホッピングされた信号を所定の時間単位毎に端末装置から受信し、
前記端末装置から受信した信号の品質を、前記信号がホッピングされた前記周波数帯毎に前記時間単位で別々に測定し、
前記周波数帯毎の測定品質と目標品質とのそれぞれの差異に応じて、前記端末装置にて増減すべき上り送信電力量が示された送信電力制御情報を、前記各周波数帯で別々に生成し、
前記周波数帯毎に別々に生成された送信電力制御情報を前記端末装置へ送信する
ことを特徴とする送信電力制御方法。 - 請求項1記載の送信電力制御方法において、
測定の対象となった測定信号と、時間的に前後するいずれかの隣接信号とが異なる周波数帯にホッピングされていた場合、測定信号のみの品質と目標品質との差異により、前記端末装置において増減すべき上り送信電力の量が示された送信電力制御情報を生成する
ことを特徴とする送信電力制御方法。 - 請求項1記載の送信電力制御方法において、
測定の対象となった測定信号と、時間的に前後するいずれかの隣接信号とが同一の周波数帯にホッピングされていた場合、測定した品質の時間平均と、目標品質との差異により、端末装置において増減すべき上り送信電力の量が示された送信電力制御情報を生成し、
測定の対象となった測定信号と、時間的に前後するいずれかの隣接信号とが異なる周波数帯にホッピングされていた場合、測定信号のみを送信電力制御情報を生成する基として用いることを特徴とする送信電力制御方法。 - 基地局装置からホッピングされる周波数帯毎に増減すべき上り送信電力の量が示された送信電力制御情報を受信し、
各周波数帯にホッピングさせた信号の送信電力を、受信した送信電力制御情報にしたがって周波数帯毎に増減させることを特徴とする送信電力制御方法。 - 複数の周波数帯のいずれかにホッピングされた信号を所定の時間単位毎に端末装置から受信する受信部と、
前記端末装置から受信した信号の品質を、前記信号がホッピングされた前記周波数帯毎に前記時間単位で別々に測定する測定部と、
前記周波数帯毎の測定品質と目標品質とのそれぞれの差異に応じて、前記端末装置にて増減すべき上り送信電力量が示された送信電力制御情報を、前記各周波数帯で別々に生成する生成部と、
前記周波数帯毎に別々に生成された送信電力制御情報を前記端末装置へ送信する送信部と、
を具備したことを特徴とする基地局装置。 - 請求項5記載の基地局装置において、
前記生成部は、前記測定部によって測定の対象となった測定信号と、時間的に前後するいずれかの隣接信号とが異なる周波数帯にホッピングされていた場合、測定信号のみの品質と目標品質との差異により、端末装置において増減すべき上り送信電力の量が示された送信電力制御情報を生成する
ことを特徴とする基地局装置。 - 請求項6記載の基地局装置において、
前記生成部は、測定の対象となった測定信号と、時間的に前後するいずれかの隣接信号とが同一の周波数帯にホッピングされていた場合、測定した品質の時間平均と、目標品質との差異により、端末装置において増減すべき上り送信電力の量が示された送信電力制御情報を生成し、
測定の対象となった測定信号と、時間的に前後するいずれかの隣接信号とが異なる周波数帯にホッピングされていた場合、測定信号のみを送信電力制御情報を生成する基として用いることを特徴とする基地局装置。 - 基地局装置から、ホッピングされる周波数帯毎に増減すべき上り送信電力の量が示された送信電力制御情報を受信する受信部と、
信号を複数の周波数帯にホッピングさせる周波数ホッピング部と、
前記周波数ホッピング部によってホッピングさせた信号の送信電力を、前記受信部によって受信された送信電力制御情報を用いて、周波数帯毎に増減させる送信電力制御部と、
を具備したことを特徴とする端末装置。
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