WO2007020710A1 - 基地局装置および移動局装置 - Google Patents
基地局装置および移動局装置 Download PDFInfo
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- WO2007020710A1 WO2007020710A1 PCT/JP2005/015157 JP2005015157W WO2007020710A1 WO 2007020710 A1 WO2007020710 A1 WO 2007020710A1 JP 2005015157 W JP2005015157 W JP 2005015157W WO 2007020710 A1 WO2007020710 A1 WO 2007020710A1
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- WIPO (PCT)
- Prior art keywords
- frame
- base station
- scrambling code
- sch
- identification signal
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Classifications
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0076—Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
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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 signaling, i.e. of overhead other than pilot signals
-
- 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
- H04L5/0058—Allocation criteria
-
- 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
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
Definitions
- Base station apparatus and mobile station apparatus are Base station apparatus and mobile station apparatus
- the present invention relates to a base station device and a mobile station device, and more particularly to a base station device and a mobile station device that perform multicarrier communication.
- 3GPP RAN LTE Long Term Evolution
- the OFDM system is considered to be the dominant downlink radio transmission system used here.
- Non-Patent Documents 1 and 2 as a configuration of a pilot channel in the OFDM scheme, a common pilot channel and individual pilot channels are scattered in the time direction and the frequency direction within a TTI (Transmission Time Interval). Scattered mapping has been proposed (see Figure 1).
- Non-Patent Document 3 proposes an arrangement in which two different SCHs are multiplexed in the frequency direction within lOFDM symbols as a configuration of a SCH (Synchronization Channel) (see FIG. 2).
- the ratio of SCH sequences to be allocated is an lOFDM symbol in the Si frame.
- a primary SCH P_SCH
- S—SCH Secondary SCH
- a different scramble code is assigned to each cell in order to identify a cell covered by a base station apparatus, and the mobile station apparatus switches between cells when moving (hand-on).
- Cell search that is, identification of a scramble code for identifying a cell, is required during intermittent reception.
- the mobile station extracts a P-SCH from the received signal and obtains a correlation in the frequency direction with the P-SCH replica.
- the mobile station then correlates all symbols And the timing at which the maximum correlation value is obtained is detected.
- the frame timing is detected from the positional relationship (known) in the frame of this symbol.
- the S-SCH is demodulated (decoded), and the code group is identified from the result.
- CPICH is extracted from the received signal based on the frame timing and correlated with CPI CH replicas corresponding to all scramble codes belonging to the code group identified in the second stage. Then, the scrambling code corresponding to the largest correlation value is identified. Thus, the cell search is completed.
- Non-Patent Document 1 3GPP TR 25.913 v2.0.0 "Requirements for Evolved UTRA and UTRA N"
- Non-Patent Document 2 3GPP Rl-050589, NTT DoCoMo "Pilot Channel and Scrambling Code in Evolved UTRA Downlink” (June 2005)
- Non-Patent Document 3 3GPP Rl-050590, NTT DoCoMo "Physical Channels and Multiplexing in Evolved UTRA Downlink” (June 2005)
- An object of the present invention is a base station apparatus and mobile station apparatus that perform multicarrier communication, and transmits a frame that can perform cell search without being affected by the arrangement of pilot channels. It is to provide a device and a mobile station device that performs cell search using this frame.
- a base station apparatus of the present invention is a base station apparatus that performs multicarrier communication, and includes a frame Frame synchronization sequences used for timing synchronization are arranged in the frequency direction on some symbols of multicarrier symbols at predetermined positions from the beginning of the frame, and correspond to the base station scrambling code assigned to the own device Frame forming means for forming a frame in which a scrambling code identification signal is arranged in the frequency direction so as not to overlap a part of the multicarrier symbol with the same symbol as the frame synchronization sequence; and transmitting means for transmitting the frame;
- the structure which comprises is taken.
- Another aspect of the base station apparatus of the present invention is a base station apparatus that performs multicarrier communication, in which a frame synchronization sequence used for frame timing synchronization in a predetermined subcarrier is determined from the head of the frame.
- a scrambling code identification signal corresponding to a base station scrambling code allocated to the own apparatus is arranged at a predetermined position in the time axis direction, and the frame synchronization sequence and the subcarrier on which the frame synchronization sequence is arranged.
- a configuration is adopted that includes frame forming means for forming frames arranged in the time axis direction so as not to overlap with the same symbol, and transmitting means for transmitting the frames.
- the mobile station apparatus of the present invention is a mobile station apparatus that performs a cell search using a frame transmitted from a base station apparatus, and a frame synchronization sequence used for frame timing synchronization is predetermined from the beginning of the frame.
- a scrambling code identification signal corresponding to a base station scrambling code of the base station apparatus and arranged in a part of the subcarrier symbols at the position of Frame synchronization is performed according to a receiving unit that receives a frame arranged in the frequency direction so as not to overlap with the same symbol as a frame synchronization sequence, and a pattern in which the frame synchronization sequence is arranged in each subcarrier symbol of the received frame.
- Correlation means for multiplying sequence replicas to obtain correlations, and based on correlation values obtained by the correlation means.
- Frame timing detection means for detecting frame timing
- demodulation means for extracting and demodulating the scrambling code identification signal from the received frame according to the frame timing detected by the frame timing detection means
- demodulation And identifying means for identifying the base station scrambling code corresponding to the scrambling code identification signal.
- Another aspect of the mobile station apparatus of the present invention is a mobile station apparatus that performs a cell search using a frame transmitted from a base station apparatus, and synchronizes frame timing in a predetermined subcarrier.
- the frame synchronization sequence used for the base station is arranged at a predetermined position in the time axis direction and the scrambling code identification signal corresponding to the base station scrambling code assigned to the base station apparatus is the same as that of the frame.
- Receiving means for receiving a frame arranged in a time axis direction so as not to overlap with a subcarrier in which a period sequence is arranged with the same symbol as the frame synchronization series; and a subcarrier signal in which the frame synchronization series is arranged The phase to obtain the correlation by multiplying the frame synchronization sequence replica according to the pattern in which the frame synchronization sequence is arranged.
- frame timing detection means for detecting frame timing based on the correlation value obtained by the correlation means, and from the received frame according to the frame timing detected by the frame timing detection means.
- the demodulating means for extracting and demodulating the scrambling code identification signal and the identifying means for identifying the base station scrambling code corresponding to the demodulated scrambling code identification signal are adopted.
- a base station apparatus and a mobile station apparatus that perform multi-carrier communication the base station apparatus that transmits a frame capable of performing cell search without being affected by the arrangement of pilot channels.
- a mobile station apparatus that performs cell search using this frame can be provided.
- FIG. 1 A diagram for explaining a pilot channel configuration in a frame of a conventional OFDM communication system.
- FIG.2 Diagram for explaining the synchronization channel configuration in the frame of the conventional OFDM communication system
- FIG. 3 is a block diagram showing a configuration of a base station apparatus according to Embodiment 1 of the present invention.
- FIG. 4 Frame configuration diagram formed by the base station apparatus of FIG.
- FIG. 5 is a diagram for explaining the configuration of an S-SCH sequence included in the frame of FIG.
- FIG. 6 is a table showing combinations of S-SCH sequence patterns in FIG.
- FIG. 7 is a block diagram showing a configuration of a mobile station apparatus according to Embodiment 1
- FIG. 8 is a table showing another aspect of the S-SCH sequence pattern.
- FIG. 9 is a block diagram showing a configuration of a base station apparatus according to Embodiment 2
- FIG. 10 Frame configuration diagram formed by the base station apparatus of FIG.
- FIG. 11 is a block diagram showing a configuration of a mobile station apparatus according to Embodiment 2
- FIG. 12 is a block diagram showing a configuration of a base station apparatus according to Embodiment 3.
- base station apparatus 100 of Embodiment 1 includes error correction coding section 105, modulation section 110, CPICH generation section 115, frame formation section 120, IFFT section 140, GI An input unit 145 and an RF transmission unit 150 are included.
- the frame forming unit 120 includes a frame forming unit 125, a scrambling processing unit 130, and an SCH insertion unit 135.
- Error correction coding section 105 receives transmission data and performs predetermined error correction coding processing.
- Modulation section 110 receives the signal after error correction coding and performs predetermined modulation processing.
- the CP 1 ⁇ 1 generation unit 115 generates a CPICH symbol.
- Frame configuration section 125 receives a CPICH symbol and a modulated signal, and considers the position in the frame where the SCH sequence is inserted in SCH insertion section 135 in advance on the frequency axis and the time axis. Place it at a fixed position.
- the frame assembled in this way by the frame construction unit 125 is input to the scrambling processing unit 130.
- Scrambling processing section 130 multiplies the frame formed by frame configuration section 125 by a base station scrambling code unique to base station apparatus 100. This base station scrambling code is used to identify the cell (or sector) covered by base station apparatus 100.
- the SCH insertion unit 135 performs two different SCH sequences (P-SCH system lj, SS) on the frame multiplied by the base station scrambling code in the scrambling processing unit 130. Insert CH (1J).
- This P-SCH sequence (primary SCH sequence) is used for frame synchronization on the frame reception side.
- the S-SCH sequence (secondary SCH sequence IJ) itself represents the identification information of the base station scrambling code. The configuration of the S-SCH sequence will be described later.
- two different SCH sequences (P-SCH system ⁇ , S-SCH system ⁇ ) are used for a predetermined OFDM symbol, that is, for a specific symbol timing of all subcarriers.
- lj) is time-multiplexed, and the time-multiplexed SCH sequence is inserted into the frame after scrambling.
- the frame formed by the frame forming unit 120 has a configuration as shown in FIG. That is, two different SCH sequences (P-SCH system lj, S-SCH system IJ) are arranged in the frequency axis direction in a predetermined OFDM symbol in the frame.
- P-SCH system lj two different SCH sequences
- S-SCH system IJ two different SCH sequences
- the “Put SCH sequence” in the P-SCH sequence and the P-SCH sequence OFDM symbol indicates that the P-SCH sequence and the S-SCH sequence are alternately arranged on the subcarriers of the OFDM symbol. It becomes a pattern to be done.
- IFFT section 140 performs inverse fast Fourier transform (IFFT) on the frame (transmission signal) in which the SCH sequence is inserted in SCH insertion section 135, and applies it to the frequency domain force time axis domain. After conversion, output to GI insertion unit 145.
- IFFT inverse fast Fourier transform
- the GI insertion unit 145 inserts a guard interval (GI) into the output signal of the IFFT unit 140. This guard interval is inserted for each OFDM symbol.
- GI guard interval
- the signal after insertion of the guard interval is subjected to RF processing such as up-conversion and AZD conversion in the RF transmission section 150, and is transmitted via the antenna.
- S-SCH sequence As shown in FIG. 5, the S-SCH sequence is divided into two blocks, and S-SCH pattern 1 and S-SCH pattern 2 are arranged in each block.
- One block, S—SCH pattern 1, corresponds to a code group that groups base station scrambling codes.
- SCH pattern 2 series corresponds to base station scrambling code. Ie, S
- the SCH sequence eventually includes the identification information of the base station scrambling code as a whole.
- the S—SCH pattern 1 requires at least 4 bits and the S—SCH pattern 2 requires at least 5 bits.
- mobile station apparatus 200 of Embodiment 1 includes RF receiving section 205, symbol timing detecting section 210, FFT processing section 215, P-SCH correlation value calculating section 220, frame A timing detection unit 225, an S-SCH demodulation unit 230, a scramble code identification unit 235, a descrambling processing unit 240, a demodulation unit 245, and an error correction decoding unit 250 are included.
- RF receiving section 205 receives a multicarrier signal transmitted from base station apparatus 100 via an antenna, and performs predetermined radio reception processing (down-conversion, A / D conversion, etc.) on the received signal. Apply.
- Symbol timing detection section 210 detects symbol timing based on the correlation characteristics of the guard interval included in the received signal (first stage of cell search).
- the text processing unit 215 removes the guard interval and performs FFT processing according to the symbol timing detected by the symbol timing detection unit 210.
- P—SCH correlation value calculation section 220 receives the received signal after FFT processing, and for all OFDM symbols for one frame, the received signal and P for the subcarrier on which the P—SCH sequence is multiplexed. — Performs correlation in the frequency direction with the SCH sequence replica.
- the correlation calculation in the frequency direction may be performed for some subcarriers. The amount of computation can be reduced compared to the case of arranging series.
- P-SCH correlation value calculation section 220 receives frame timing information from frame timing detection section 225, P-SCH sequence is arranged according to this frame timing information, and P-SCH sequence The correlation calculation in the frequency direction with the replica is performed, and the correlation result is output to the S-SCH demodulator 230.
- Frame timing detection section 225 adds the power of the correlation value calculated by P-SCH correlation value calculation section 220 for each OFDM symbol, and provides the largest added correlation value (maximum added correlation value). Is detected as frame timing. Then, the frame timing detection unit 225 outputs the frame timing information to the P-SCH calculation unit 220 and the S-SCH demodulation unit 230.
- S-SCH demodulator 230 receives the received signal after the FFT processing, extracts a symbol in which the S-SCH sequence is arranged according to the frame timing information from frame timing detector 225, and performs demodulation. Do. This demodulation processing is performed by multiplying the extracted symbol by the complex conjugate of the correlation result received from the P-SCH correlation value calculation unit 220 at the stage of extracting the symbol in which the S-SCH sequence is arranged. Done. This is expressed as follows.
- X is the correlation result between the received signal and the P-SCH replica
- r is the received signal after FFT processing
- S-SCH extracted from the received signal C is the S-SCH demodulation result (S-SCH pattern) and
- the above correlation result regarding the P-SCH sequence that is affected by the propagation path between the base station apparatus 100 and the mobile station apparatus 200 (such as phase rotation and amplitude fluctuation due to fading). Can be used to perform channel compensation for S-SCH sequences that are also affected by the channel, reducing the probability of errors in demodulation of S-SCH sequences.
- the S-SCH demodulator 230 outputs the demodulated S-SCH pattern as shown in FIG. 6, for example, to the scramble code identification unit 235.
- the scramble code identifying unit 235 refers to a table as shown in FIG. 6, and identifies a corresponding scrambling code based on the S-SCH pattern from the S-SCH decoding unit 230.
- the descrambling processing unit 240 inputs the signal after the FFT processing from the FFT processing unit 215 and performs descrambling by multiplying the base station scrambling code identified by the scramble code identifying unit 235. Then, the descrambled signal is output to demodulation section 245.
- Demodulation section 245 inputs the descrambled signal, performs appropriate demodulation processing, and demodulates The subsequent signal is output to error correction decoding section 250.
- Error correction decoding section 250 receives the demodulated signal, performs an appropriate error correction decoding process, and outputs the error corrected decoding signal as received data.
- the OFDM symbol in which the P-SCH sequence is arranged and the OFDM symbol in which the S-S CH sequence is arranged is described, but the present invention is limited to this.
- the OFDM symbols in which both sequences are arranged may be different.
- a P-SCH sequence is arranged in the frequency direction at a part of the OFDM symbol at a predetermined position from the beginning of the frame, and the correlation value in the frequency direction between this P-SCH sequence and P-SCH sequence replica is set on the receiving side.
- the frame timing can be identified on the basis of the S-SCH sequence on the subcarrier or symbol timing that is part of the OFDM symbol at a predetermined position from the beginning of the frame and where the P-SCH is not allocated.
- the scrambling code can be identified by demodulating this S-SCH sequence.
- the OFDM symbol in which the P-SCH sequence is arranged is the same as the OFDM symbol in which the S-SCH sequence is arranged, the P included in the same OFDM symbol when performing the above-mentioned propagation path compensation.
- Propagation path compensation for the S-SCH sequence is performed using the correlation result for the SCH sequence. Since it is considered that the signal is affected by the same channel at the same timing, the channel compensation of the S-SCH sequence is more effective using the correlation results for the P-SCH sequence included in the same OFDM symbol. Can be done automatically.
- S-SCH sequences as shown in Fig. 6 are conceivable.
- the S_SCH sequence pattern and scrambling code identification information may be directly associated with each other without introducing the concept of code group and label.
- the S-SCH series pattern itself only needs to include the force scrambling code identification information.
- OFDM communication has been described between base station apparatus 100 and mobile station apparatus 200.
- the present invention is not limited to this, and multicarrier communication may be used. ,. In that case, replace “ ⁇ FDM symbol” with “multi-carrier symbol”.
- the base station apparatus 100 that performs multicarrier communication includes A frame synchronization sequence (P-SCH system IJ) used for frame timing synchronization is arranged in the frequency direction on a part of multicarrier symbols at a predetermined position from the head of the frame, and assigned to the own device. If the scrambling code identification signal (S—SCH system 1J) corresponding to the base station scrambling code is overlapped with a part of the multicarrier symbol at a predetermined position from the beginning of the frame with the same symbol as the frame synchronization sequence A frame forming unit 120 for forming a frame arranged in the frequency direction and an RF transmitting unit 150 for transmitting the frame are provided.
- P-SCH system IJ frame synchronization sequence
- S—SCH system 1J scrambling code identification signal
- the base station scrambling code can be identified directly without using the notor channel by demodulating the scrambling code identification signal at the frame receiving side (mobile station apparatus 200). Therefore, cell search that is not affected by the arrangement of pilot channels can be realized.
- the base station apparatus 100 uses the frame synchronization sequence used for frame timing synchronization.
- P—SCH system IJ is arranged in the frequency direction on some symbols of the multicarrier symbol at a predetermined position from the beginning of the frame, and corresponds to the base station scrambling code assigned to its own device
- an RF transmitter 150 for transmitting the frame. That is, frame forming section 120 arranges the frame synchronization sequence and the scrambling code identification signal in the same multicarrier symbol.
- the base station scrambling code can be directly identified without using the notor channel by demodulating the scrambling code identification signal at the frame receiving side (mobile station device 200). Therefore, cell search that is not affected by the arrangement of pilot channels can be realized.
- the scrambling code identification signal includes a code gnope identification signal corresponding to the code gnope in which the base station scrambling code is grooved, and a scrambling code identification signal included in each code group.
- the scrambling is performed on the frame receiving side (mobile station apparatus 200).
- the base station scrambling code can be identified directly without using the pilot channel, thereby realizing a cell search that is not affected by the location of the pilot channel.
- a frame synchronization sequence (P-SCH system) used for frame timing synchronization is transmitted to mobile station apparatus 200 that performs cell search using a frame transmitted from base station apparatus 100.
- (1J) is a scrambling code identification signal (1J) that is arranged in the frequency direction on some symbols of the multicarrier symbol at a predetermined position and that corresponds to the base station scrambling code of the base station apparatus (
- An RF receiving unit 205 that receives a frame arranged in the frequency direction so that the S-SCH sequence) does not overlap with a part of a multicarrier symbol at a predetermined position from the beginning of the frame with the same symbol as the frame synchronization sequence;
- Each multicarrier symbol of the received frame is multiplied by a frame synchronization sequence replica according to the pattern in which the frame synchronization sequence is arranged.
- P-SCH correlation value calculation section 220 for obtaining a correlation
- frame timing detection section 225 for detecting frame timing based on the correlation value obtained by P-SCH correlation value calculation section 220
- frame timing detection S-SCH demodulator 230 for extracting and demodulating the scrambling code identification signal from the received frame according to the frame timing detected by unit 225, and the demodulating scrambling code identification signal corresponding to the demodulated scrambling code identification signal
- a scramble code identifying unit 235 for identifying a base station scrambling code.
- the base station scrambling code can be identified directly without using the pilot channel. To achieve a cell search.
- a frame synchronization sequence used for frame timing synchronization is from the beginning of the frame.
- a scrambling code identification signal (S-SCH system IJ) that is arranged in a frequency direction on a part of the multicarrier symbols at a predetermined position and that corresponds to the base station scrambling code of the base station apparatus is a frame.
- An RF receiver 205 for receiving a frame arranged in the frequency direction so as not to overlap a part of the carrier synchronization symbol with the same symbol as the frame synchronization sequence, and each multicarrier symbol of the received frame to the frame Based on the correlation values obtained by the P-SCH correlation value calculation unit 220 and the P-SCH correlation value calculation unit 220, which perform correlation by multiplying the frame synchronization sequence replica according to the pattern in which the synchronization sequence is arranged, A frame timing detection unit 225 for detecting frame timing, and an S-SCH demodulation unit 230 for extracting and demodulating the scrambling code identification signal from the received frame according to the frame timing detected by the frame timing detection unit 225 And identifying the base station scrambling code corresponding to the demodulated scrambling code identification signal. And a scrambling code identification unit 235. That is, the RF receiving unit 205 receives a frame arranged in a multicarrier symbol having the same power as the frame synchronization system IJ and the scrambling code identification signal.
- the base station scrambling code can be identified directly without using the pilot channel. To achieve a cell search.
- the P-SCH correlation value calculation unit 220 performs a frame synchronization sequence arranged in the received frame according to the frame timing detected by the frame timing detection unit 225, and the frame synchronization sequence replica.
- the correlation result is output, and the S-SCH demodulator 230 demodulates the extracted scrambling code identification signal with propagation path compensation based on the correlation result output from the P-SCH correlation value calculator 220.
- the frame synchronization sequence (P — SCH system 1J) that is affected by the propagation path (phase rotation, amplitude fluctuation, etc. due to fading) between the base station apparatus 100 and the mobile station apparatus 200.
- the channel compensation for the scrambling code identification signal (S—SCH system ⁇ IJ), which is also affected by the propagation path, can be performed, and the scrambling code identification signal (S — The probability of errors in the demodulation of SCH system (IJ) can be reduced.
- the subcarrier symbol in which the frame synchronization sequence (P—SCH system ⁇ 1J) is arranged and the subcarrier symbol in which the scrambling code identification signal (S—SCH system ⁇ IJ) is arranged When the carrier symbol is the same, when performing the above-mentioned propagation path compensation, the correlation result related to the frame synchronization sequence (P—SCH system ⁇ lj) included in the same subcarrier symbol is used to perform scrambling. The channel compensation of the code identification signal (S_SCH system ⁇ 1J) will be performed.
- the scrambling code identification signal is obtained using the correlation result of the frame synchronization sequence (P-SCH system ⁇ lj) included in the same ⁇ F DM symbol.
- the power S can be more effectively performed to compensate the propagation path of (S—SCH system IJ).
- Embodiment 1 a frame in which a P-SCH sequence and an S-SCH sequence are arranged in an OFDM symbol in the frequency axis direction is used.
- a frame arranged in the time axis direction on a predetermined subcarrier is used.
- base station apparatus 300 has frame forming section 310.
- the frame forming unit 310 includes a frame configuration unit 320 and an SCH insertion unit 330.
- Frame configuration section 320 receives a CPICH symbol and a modulated signal, and determines in advance on the frequency axis and the time axis in consideration of the position in the frame where the SCH sequence is inserted in SCH insertion section 330. Place it at the indicated position.
- the frame assembled by the frame construction unit 320 in this manner is input to the scrambling processing unit 130.
- the SCH insertion unit 330 generates two different SCH sequences (P-SCH system ⁇ 1J, S-S CH sequence) for the frame multiplied by the base station scrambling code in the scrambling processing unit 130. Buy.
- the SCH sequence is frequency-multiplexed on a plurality of predetermined subcarriers, that is, on a predetermined frequency axis, and the frequency-multiplexed SCH sequence is subjected to scrambling processing. Get into the frame.
- the frame formed by the frame forming unit 310 has a configuration as shown in FIG. That is, a plurality of predetermined subcarriers are arranged such that two different P-SCH systems IJ and S-SCH sequences are overlapped with each other with the same symbol. ing.
- the “arrangement pattern” in the subcarriers of the P-SCH sequence and the P-SCH sequence is a pattern in which both sequences are alternately arranged in symbols on each subcarrier.
- mobile station apparatus 400 has P-SCH correlation value calculation section 410, frame timing detection section 420, and S-SCH demodulation section 430.
- P-SCH correlation value calculation section 410 receives a received signal after FFT processing, and a subcarrier on which a P-SCH sequence is multiplexed (hereinafter also referred to as "SCH subcarrier"). The correlation calculation in the time direction between the received signal and the replica of the P-SCH sequence is performed. In particular, in the present embodiment, since the P-SCH sequence and the S-SCH sequence are alternately arranged on the same subcarrier symbol, the P-SCH correlation value calculation section 410 is configured to receive the received signal and the P-number. — When correlating with the SCH sequence replica, the correlation in the time axis direction is taken for every other symbol. That is, P-SCH correlation value calculation section 410 obtains the correlation in the time axis direction between the received signal and the P-SCH sequence according to the arrangement pattern on the subcarrier of the P-SCH sequence.
- SCH subcarrier a subcarrier on which a P-SCH sequence is multiplexed
- P-SCH correlation value calculation section 410 receives frame timing information from frame timing detection section 420, P-SCH sequences are arranged in each P-SCH subcarrier according to the frame timing information. The correlation calculation in the time axis direction between the symbol and the P—SCH sequence replica is performed, and the correlation result in each P_SCH subcarrier is output to the S-SCH demodulator 430.
- Frame timing detection section 420 adds power to correlation values corresponding to a plurality of P-SCH subcarriers, and detects the timing at which the largest added correlation value (maximum added correlation value) is obtained as frame timing. Frame timing detection section 420 then outputs the frame timing information to P-SCH correlation value calculation section 410 and S-SCH demodulation section 430.
- S-SCH demodulating section 430 receives the received signal after the FFT processing and, according to the frame timing information from frame timing detecting section 420, a symbol in which the S-S CH sequence is arranged in the S-SCH subcarrier Is extracted and demodulated. This demodulation process is performed at the stage where the symbols where the S-SCH sequences are arranged in the S-SCH subcarriers, and the extracted symbols of each S-SCH subcarrier and the P-SCH correlation value calculation unit 410 Is multiplied by the complex conjugate of the correlation result in each corresponding S-SCH subcarrier. The demodulated results for each S-SCH subcarrier thus obtained are averaged and output to the demodulated S-SCH pattern scramble code identifying unit 235 as shown in FIG. 6, for example.
- the power for explaining the case where the subcarrier on which the P-SCH sequence is arranged and the subcarrier on which the S-SCH sequence is arranged is the same.
- the subcarriers arranged in both series may be different.
- the P-SCH sequence is arranged in the time axis direction at a predetermined position from the beginning of the frame in a predetermined subcarrier, and the time axis between the P-SCH sequence and the P-SCH sequence replica is set on the receiving side.
- the frame timing can be determined based on the correlation value of the direction, and the P-SCH sequence on the subcarrier where the P-SCH is not allocated or on the same subcarrier is allocated.
- the subcarrier on which the P-SCH sequence is arranged is the same as the subcarrier on which the S-SCH sequence is arranged, the subcarrier is arranged on the same subcarrier when performing the above-described channel compensation.
- the correlation results for the P-SCH sequence are used to compensate for the propagation path of the S-SCH sequence. Since it is considered that the same subcarrier is affected by the same propagation path, the S-SCH sequence propagation path compensation is performed using the correlation result for the P-SCH sequence placed on the same subcarrier. It can be done more effectively.
- the configuration of the S-SCH sequence may be the configuration shown in Fig. 8, and in short, the S-SCH sequence pattern itself includes scrambling identification information. Just go.
- the power described in the case where OFDM communication is performed between base station apparatus 300 and mobile station apparatus 400 is not limited to this, and is not limited to multicarrier. If it ’s communication, In this case, the above “OFDM symbol” is read as “multi-carrier symbol”.
- the base station apparatus 300 that performs multi-carrier communication uses a frame used for frame timing synchronization in a predetermined subcarrier.
- a scrambling code corresponding to the base station scrambling code assigned to the local station, and is arranged in the time axis direction at a predetermined position from the beginning of the frame.
- a frame forming unit 310 that forms a frame arranged in the time axis direction so that the identification signal does not overlap with the same symbol as the frame synchronization sequence at a predetermined position from the beginning of the frame; and an RF transmitting unit 150 that transmits the frame , Provided.
- the base station scrambling code is directly identified without using the notor channel by demodulating the scrambling code identification signal at the frame receiving side (mobile station apparatus 400). Therefore, cell search that is not affected by the arrangement of pilot channels can be realized.
- a frame synchronization sequence (P-SCH sequence) used for frame timing synchronization in a predetermined subcarrier is transmitted to a predetermined position from the beginning of the frame to base station apparatus 300 that performs multicarrier communication.
- a scrambling code identification signal corresponding to a base station scrambling code assigned to the own apparatus is arranged in the axial direction and is identical to the frame synchronization sequence on a subcarrier on which the frame synchronization sequence is arranged.
- a frame formation unit 310 that forms frames arranged in the time axis direction so as not to overlap with symbols, and an RF transmission unit 150 that transmits the frames are provided. That is, frame forming section 310 arranges the frame synchronization sequence and the scrambling code identification signal on the same subcarrier.
- the base station scrambling code is directly identified without using the notor channel by demodulating the scrambling code identification signal at the frame receiving side (mobile station apparatus 400). Therefore, cell search that is not affected by the arrangement of pilot channels can be realized.
- the scrambling code identification signal includes a code group identification signal corresponding to a code group in which the base station scrambling code is gnoped, and a scrambling code identification signal included in each code group.
- the base station scrambling code is directly identified without using the notor channel by demodulating the scrambling code identification signal at the frame receiving side (mobile station device 400).
- the pilot channel A cell search that is not affected can be realized, and a predetermined process performed for each code group can also be performed.
- mobile station apparatus 400 that performs cell search using a frame transmitted from base station apparatus 300 is used for frame timing synchronization in a predetermined subcarrier.
- Frame synchronization sequence P-SCH system IJ
- base station scrambling code corresponding to a base station scrambling code that is arranged in the time axis direction at a predetermined position from the beginning of the frame and assigned to the base station apparatus 300.
- An RF receiving unit 205 for receiving a frame arranged in the time axis direction so that a scrambling code identification signal (S SCH system IJ) does not overlap with a predetermined position from the beginning of the frame with the same symbol as the frame synchronization sequence;
- the subcarrier signal on which the frame synchronization sequence is arranged is multiplied by a frame synchronization sequence replica according to the pattern on which the frame synchronization sequence is arranged.
- a P-SCH correlation value calculation unit 410 that takes a frame timing, a frame timing detection unit 420 that detects a frame timing based on the correlation value obtained by the P-SCH correlation value calculation unit 410, and a frame timing detection unit
- the S-SCH demodulator 430 extracts and demodulates the scrambling code identification signal from the received frame according to the frame timing detected at 420, and the base station scrambling corresponding to the demodulated scrambling code identification signal And a scrambling / recording identification unit 235 for identifying the ring code.
- mobile station apparatus 400 that performs cell search using a frame transmitted from base station apparatus 300 has a frame synchronization sequence (P-SCH) used for frame timing synchronization in a predetermined subcarrier.
- a system 1J) is arranged in a time axis direction at a predetermined position from the beginning of the frame, and a scrambling code identification signal (S-SCH system) corresponding to the base station scrambling code assigned to the base station apparatus 300 J 1J) receives a frame arranged in the time axis direction so as not to overlap with the same symbol as the frame synchronization sequence on the subcarrier on which the frame synchronization sequence is arranged;
- a P-SCH correlation value calculation unit 410 that multiplies the subcarrier signal in which the frame synchronization sequence is arranged by a frame synchronization sequence replica according to the pattern in which the frame synchronization sequence is arranged to obtain a correlation, and a P-SCH correlation.
- a frame timing detection unit 420 that detects frame timing based on the correlation value obtained by the value calculation unit 410, and the scrambling from the received frame according to the frame timing detected by the frame timing detection unit 420.
- An S-SCH demodulating section 430 that extracts and demodulates a ring code identification signal and a scrambling record identification section 235 that identifies the base station scrambling code corresponding to the demodulated scrambling code identification signal are provided.
- the P-SCH correlation value calculation unit 410 is a correlation result between the frame synchronization sequence arranged in the received frame and the frame synchronization sequence replica according to the frame timing detected by the frame timing detection unit 420.
- S-SCH demodulator 430 outputs P
- the extracted scrambling code identification signal is subjected to channel compensation and demodulated.
- the frame synchronization sequence (P) that is affected by the propagation path (phase rotation, amplitude fluctuation, etc. due to fading) between the base station apparatus 300 and the mobile station apparatus 400.
- Embodiment 1 and Embodiment 2 the P-SCH sequence and the S-SCH sequence are directly input to the SCH insertion unit and arranged on the frame.
- Embodiment 3 error correction coding is performed before the S-SCH sequence is input to the SCH insertion unit.
- base station apparatus 500 of Embodiment 3 has encoding processing section 155.
- This code processing unit 155 applies specific coding to the S-SCH sequence, and performs S-coding after coding.
- the base station apparatus and mobile station apparatus of the present invention are a base station apparatus and mobile station apparatus that perform multicarrier communication, and a frame that can perform cell search without being affected by the arrangement of pilot channels. It is useful as a base station apparatus that transmits data and a mobile station apparatus that performs cell search using this frame.
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- Engineering & Computer Science (AREA)
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- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/015157 WO2007020710A1 (ja) | 2005-08-19 | 2005-08-19 | 基地局装置および移動局装置 |
JP2007530892A JPWO2007020710A1 (ja) | 2005-08-19 | 2005-08-19 | 基地局装置および移動局装置 |
US12/064,046 US20090136037A1 (en) | 2005-08-19 | 2005-08-19 | Base station device and mobile station device |
EP05772689A EP1906571A1 (en) | 2005-08-19 | 2005-08-19 | Base station device and mobile station device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/015157 WO2007020710A1 (ja) | 2005-08-19 | 2005-08-19 | 基地局装置および移動局装置 |
Publications (1)
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WO2007020710A1 true WO2007020710A1 (ja) | 2007-02-22 |
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ID=37757382
Family Applications (1)
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PCT/JP2005/015157 WO2007020710A1 (ja) | 2005-08-19 | 2005-08-19 | 基地局装置および移動局装置 |
Country Status (4)
Country | Link |
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US (1) | US20090136037A1 (ja) |
EP (1) | EP1906571A1 (ja) |
JP (1) | JPWO2007020710A1 (ja) |
WO (1) | WO2007020710A1 (ja) |
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WO2007129546A1 (ja) * | 2006-05-01 | 2007-11-15 | Ntt Docomo, Inc. | 基地局及び同期チャネル生成方法 |
WO2008112803A3 (en) * | 2007-03-12 | 2008-11-27 | Qualcomm Inc | Hybrid pilot configuration |
WO2009020878A1 (en) * | 2007-08-03 | 2009-02-12 | Qualcomm Incorporated | Method and apparatus for determining cell timing in a wireless communication system |
EP2187550A1 (en) * | 2007-08-07 | 2010-05-19 | Sharp Kabushiki Kaisha | Base station device, mobile station device, communication system, and communication method |
JP2010528565A (ja) * | 2007-05-25 | 2010-08-19 | クゥアルコム・インコーポレイテッド | 同期チャネルのためのスクランブル方法 |
JP2012509644A (ja) * | 2008-11-20 | 2012-04-19 | アドバンスト・マイクロ・ディバイシズ・インコーポレイテッド | 多重キャリア変調ベースの受信機における同期 |
JP2013243671A (ja) * | 2007-08-13 | 2013-12-05 | Qualcomm Inc | E−utranのための二次同期コードブック |
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WO2007097597A2 (en) | 2006-02-24 | 2007-08-30 | Lg Electronics Inc. | Methods of searching code sequence in mobile communication system |
US20090232108A1 (en) * | 2008-03-07 | 2009-09-17 | Interdigital Patent Holdings, Inc. | I/q imbalance estimation using synchronization signals in lte systems |
CN107659960B (zh) * | 2008-03-10 | 2019-10-18 | 苹果公司 | 移动站、用于操作移动站的方法和存储器介质 |
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JP2008028974A (ja) * | 2006-05-01 | 2008-02-07 | Ntt Docomo Inc | 基地局及び同期チャネル生成方法 |
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EP2187550A4 (en) * | 2007-08-07 | 2012-09-12 | Sharp Kk | BASE STATION DEVICE, MOBILE STATION DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD |
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US9674802B2 (en) | 2007-08-13 | 2017-06-06 | Qualcomm Incorporated | Secondary synchronization codebook for E-UTRAN |
US9794901B2 (en) | 2007-08-13 | 2017-10-17 | Qualcomm Incorporated | Secondary synchronization codebook for E-UTRAN |
US10231199B2 (en) | 2007-08-13 | 2019-03-12 | Qualcomm Incorporated | Secondary synchronization codebook for E-UTRAN |
JP2012509644A (ja) * | 2008-11-20 | 2012-04-19 | アドバンスト・マイクロ・ディバイシズ・インコーポレイテッド | 多重キャリア変調ベースの受信機における同期 |
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Also Published As
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JPWO2007020710A1 (ja) | 2009-02-19 |
EP1906571A1 (en) | 2008-04-02 |
US20090136037A1 (en) | 2009-05-28 |
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