JP4850285B2 - Receiver and reception processing method - Google Patents

Description

  The present invention relates to a receiver and a reception processing method. The present invention is suitable for use in, for example, a W-CDMA (Wideband-Code Division Multiple Access) receiver.

(A) Prior Art In a W-CDMA system conforming to the 3GPP standard, on the receiving side (for example, a receiving system of a mobile station (CDMA receiver)), for example, as shown in FIG. After necessary radio reception processing such as low-noise amplification and frequency conversion (down-conversion) is performed by the unit 102, it is converted into a digital signal by an AD converter (ADC) 103 and is then sent to an AGC (Automatic Gain Controller) 104. The amplitude is adjusted, despreading processing is performed by the despreading unit 105, synchronous detection is performed by the synchronous detection unit 106, and input to the channel codec (ChCodec) 107.

  In the channel codec 107, the presence / absence of TFCI is set from the upper layer to the TFCI decode / BTFD unit 171. A received data configuration (downlink physical channel (DPCH) slot format) is detected by receiving the included TFCI, and a deinterleave unit 172, an error correction unit 173, and a CRC unit are detected according to the detected data configuration. 174 is operated to perform channel codec processing (decoding processing) on the received signal after the synchronous detection, and report it to the upper layer (see FIG. 18).

  On the other hand, when no TFCI is set from the upper layer for the TFCI decoding / BTFD unit 171, the deinterleaving unit 172, the error correction unit 173, and the CRC unit 174 are operated for all data configurations by BTFD described later. Then, the most likely data configuration is selected based on the CRC result of the CRC calculation unit 174, and the data subjected to the channel codec processing (decoding processing) with the data configuration is reported to the upper layer (see FIG. 19).

(B) Description of 3GPP Next, 3GPP related to the prior art will be described.

(1) Data structure (TFC)
The data structure is called a TFC (Transport Format Combination) in 3GPP, and is a combination capable of simultaneously transferring a plurality of multiplexed transport channels (TRCH).

  When the dedicated channel is opened, a TFCS (Transport Format Combination Set), which is a set of all TFCs that may be used, is notified to the receiving side by an upper layer message. The information is set in the TFCI decode / BTFD unit 171.

(2) TFCI (Transport Format Combination Indicator)
The TFCI has a one-to-one correspondence with the TFC, and the transmission side transmits the TFCI as a data configuration identifier to the reception side according to the TFC of the transmission data. On the receiving side, by receiving the TFCI, the TFC of the transmission data can be recognized, and reception processing (channel codec processing by the deinterleaving unit 172, error correction unit 173, and CRC unit 174) is performed accordingly.

(3) BTFD (Brind Transport Format Ditection)
FIG. 16 shows the format of the downlink radio frame (DPCH). In FIG. 16, a downlink radio frame is configured by time-division multiplexing 15 slots (slots # 0 to # 14) corresponding to 2560 chip times (hereinafter also referred to as DPCH slots). Sent repeatedly to the receiver.

  Each DPCH slot includes DPDCH (Dedicated Physical Data Channel) data (user data such as voice data) and DPCCH (Dedicated Physical Control Channel) data (control data such as TPC bits, TFCI, and pilot signals). Are time-division multiplexed. The DPDCH data is distributed or divided into two areas (DATA1 and DATA2) in time in one slot.

  In 3GPP, for example, as shown in FIG. 17, for example, 49 slot formats are defined for each slot, and the channel bit rate, channel symbol rate, DPDCH bit configuration, DPCCH bit configuration, etc., respectively. Is stipulated.

  Here, in the data area of the DPDCH of the downlink radio frame shown in FIG. 16, a physical channel in a slot format (for example, slot formats # 0, # 2, # 4, # 6, # 8, etc.) in which TFCI does not exist in FIG. Is used, since the TFC of the received data is unknown on the receiving side, it is necessary to detect the TFC autonomously.

  Therefore, the reception side (the TFCI decoding / BTFD unit 171) performs reception processing on all TFCs of the TFCS notified in advance, and selects the TFC that is estimated to be most correct based on the CRC result. Such a reception process is called BTFD.

(4) Downlink power control For the downlink power control, closed loop power control is used. In the inner loop power control, a received SIR (Siginal to Interference Ratio) is compared with a target SIR. By requesting the transmission source to increase or decrease the downlink power, the reception SIR is brought close to the target SIR, and the reception quality and the target quality are compared and the target SIR is increased or decreased by an outer loop. Thereby, it becomes possible to control the downlink power to a value suitable for the target quality.

(5) Reception quality It is possible to calculate the error rate of the transport block by checking the CRC code attached to each transport block, and the reception quality can be determined from this value.

(C) Other related technologies As other related technologies, there are technologies disclosed in Patent Literature 1 and Patent Literature 2 below.

  (1) Patent Document 1 measures a period in which the power of received information is equal to or greater than a defined threshold, and uses the measured period and the information rate of the received information to determine the received information. It is described that the estimated information size value is determined, and the estimated information size value is subjected to an algorithm for determining the format of the received information, thereby detecting the format of the received information without using the TFCI information.

(2) Also, in Patent Document 2, the format of a guide channel of a communication system is detected using a lookup table or other mapping technique, and the other type of the communication system is detected using the format of the detected guide channel. It is described that the format of received information can be determined without using TFCI information by determining the format of each channel.
Japanese Patent Laid-Open No. 2003-134071 JP 2003-188854 A

  As shown in FIG. 18, the receiving side recognizes the TFC for the first time by receiving the TFCI and performs an appropriate receiving process according to the TFC (steps S101 to S103). Further, as shown in FIG. 19, when communication is performed on a physical channel that does not have TFCI, the TFC is determined from the result of receiving a plurality of times by a plurality of TFCs in the TFCS (steps S201 to S205).

  Here, for TFC slots that contain important data (for example, control data) that you do not want to be missed, it is possible to reduce the missed important data by receiving with high power in advance by downlink power control. The TFC is determined at the earliest when TFCI is present, and after receiving the TFCI, that is, after receiving the radio frame 1 frame (= 15 slots), this is received during the reception of 1 frame (10 ms). It is impossible to perform such control. This also applies to the techniques of Patent Documents 1 and 2.

The present invention has been devised in view of such problems, and one of its purposes is to make it possible to determine the data structure of a frame even during reception of a radio frame.
Another object of the present invention is to perform efficient transmission power control for the radio frame using a discrimination result.

  In addition, the present invention is not limited to the above-described object, and is an operational effect derived from each configuration shown in the best mode for carrying out the invention described later, and has an operational effect that cannot be obtained by conventional techniques. Can be positioned as one of the purposes.

(1) As a first proposal, a receiver that receives the radio frame from a transmitter that transmits radio frames with a plurality of types of data configurations, and that measures a received electric field strength distribution of a part of the radio frame And a discriminating unit that discriminates a data configuration of the radio frame based on the distribution measured by the measuring unit, wherein the discriminating unit is configured such that a result of despreading a part of the radio frame is the data configuration. A plurality of patterns that can be taken in accordance with the received electric field intensity distribution as a theoretical value, and measurement by the measuring means obtained as a result of receiving and despreading a part of the radio frame Using a receiver comprising a reception data configuration determination unit for determining the data configuration of the radio frame being received by comparing the result with the theoretical value in the memory Rukoto is Ru can.

( 2 ) Moreover, the said determination means may use the synthetic | combination result of the said measurement result about a part of several said radio | wireless frame for the said comparison.

( 3 ) Further, the control means may increase the transmission power when the data configuration determined by the determination means indicates that data having high importance is included.
(4) Further, as a second proposal, a receiver that receives the radio frame from a transmitter that transmits a radio frame with a plurality of types of data configurations, and measures a received electric field strength distribution of a part of the radio frame Measuring means, and a discriminating means for discriminating a data configuration of the radio frame based on the distribution measured by the measuring means, wherein the radio frame is composed of a plurality of time-division multiplexed slots, The measuring means may use a receiver that measures the received electric field strength distribution in a slot before a slot in which information specifying the data structure is inserted.

(5) As a third proposal, a reception processing method in a receiver for receiving the radio frame from a transmitter to transmit a radio frame with double several data structure, a part of the received electric field of the radio frame A strength distribution is measured, and a plurality of patterns that can be obtained according to the data configuration as a result of despreading a part of the radio frame are stored in advance as theoretical values of the received electric field strength distribution, and a part of the radio frame is stored. results and Kihaka constant before obtained as a pattern of the result of despreading by receiving, by comparison with the previous cut theory value, to determine the data structure of the radio frame in the reception, using the reception processing method Can do.

  According to the present invention, the reception electric field strength distribution of a part of the radio frame is measured, and the data configuration of the radio frame is determined based on the distribution. Therefore, reception of all data of the radio frame is not completed. However, the data structure can be determined at an earlier stage than before in the course of receiving the radio frame.

  Also, by controlling the transmission power from the radio frame transmitter according to the determination result (data configuration), appropriate and efficient power control can be performed at an earlier stage than before.

It is a figure which shows the flow of the downlink communication from NW (radio base station: BS) at the time of the voice call which concerns on one Embodiment of this invention to a mobile device (MS). It is a figure which shows the structure (format) example of downlink DPCH in each TFC at the time of downlink communication (voice call) shown in FIG. It is a figure which shows an example of the processing flow until it encodes TRCH and maps to DPCH at the time of downlink communication (voice call) shown in FIG. It is a figure which shows the example of distribution of the de-spreading correlation value of the received signal in each TFC shown in FIG. It is a block diagram which shows the structure of MS which concerns on one Embodiment of this invention paying attention to a receiving system. It is a flowchart explaining the operation | movement at the time of the communication start of MS shown in FIG. FIG. 6 is a flowchart illustrating an operation when receiving slot data of the MS shown in FIG. 5. FIG. It is a flowchart explaining the downlink power control of MS shown in FIG. It is a schematic diagram explaining the effect by MS (reception TFC determination method) shown in FIG. It is a block diagram which shows the modification of MS shown in FIG. It is a flowchart explaining the operation | movement at the time of the communication start of MS shown in FIG. FIG. 11 is a flowchart illustrating an operation when receiving slot data of the MS shown in FIG. 10. FIG. It is a flowchart explaining the downlink power control of MS shown in FIG. FIG. 11 is a schematic diagram for explaining threshold determination by bit addition (integration) for a plurality of slots in the MS shown in FIG. 5 or FIG. 10. It is a block diagram which shows the structural example of the conventional CDMA receiver. It is a figure which shows the frame format example of downlink DPCH. It is a figure which shows the slot format example in downlink DPCH shown in FIG. It is a flowchart explaining the receiving operation (when TFCI exists) of the conventional CDMA receiver. It is a flowchart explaining the receiving operation (in the case of no TFCI) of the conventional CMDA receiver.

Explanation of symbols

1 NW (BS (transmitter))
2 MS (CDMA receiver)
21 Antenna 22 RF unit 23 AD converter (ADC)
24 AGC
25 Despreading unit 26 Synchronous detection unit 27 Channel codec 271 TFCI code / BTFD unit 272 Deinterleave unit 273 Error correction unit 274 CRC check unit 28 TFC discrimination unit 281 Threshold memory 282 Comparator 283 Counter 283a Peak bitmap unit 284 In slot Valid data number calculation unit 284a Peak bitmap value calculation unit in slot 285 Theoretical value storage table memory 285a Theoretical value storage table memory 286 Difference calculation unit 286a Bitmap pattern matching unit 287 Minimum value detection unit 288, 288a TFC determination unit 289, 289a Target SIR correction value calculation unit 29 Downlink power control unit 30 Reception quality calculation unit

  Embodiments of the present invention will be described below with reference to the drawings. However, it goes without saying that the present invention is not limited to the embodiments described below, and can be implemented with various modifications without departing from the spirit of the present invention.

[1] Description of Embodiment (Basic Operation)
First, as an example of basic operation, FIG. 1 shows a flow of downlink communication from an NW (transmitter such as a radio base station (BS)) to a mobile device (MS) during a voice call.

  As shown in FIG. 1, the NW 1 notifies the MS 2 of the downlink DPCH slot format and TFCS in advance with the start of a call (steps S 1 and S 2). For example, TFCS is specified as shown in Table 1 below. Note that the value of the TFCS is fixed during communication (the slot format number in which no TFCI exists also does not change).

  Thereafter, the NW 1 determines (selects) the TFC from the notified TFCS according to the status of the voice data and control data to be transmitted, and performs transmission (in FIG. 1, the transmission cycle is TTI = 20 ms). For example, when there is no sound and no control, transmission is performed with TFC = 0 (step S3). When there is sound and no control data is transmitted, transmission is performed with TFC = 4 (step S5). When there is sound and control data is present. Transmits at TFC = 5 (step S7). If background noise and control data exist, transmission is performed at TFC = 3 (step S9).

  Note that, when the NW 1 determines the TFC, the NW 1 encodes the voice data and the control data and places (maps) the downlink data on the downlink DPCH. Since this mapping rule is determined and MS2 is also known, if TFC is known, MS2 can be decrypted.

Specifically, FIG. 2 shows the configuration (format) of the downlink DPCH in each TFC during a voice call.
TRCH # 1 (voice data-ClassA), TRCH # 2 (voice data-ClassB), TRCH # 3 (voice data-ClassC), and TRCH # 4 (control data) generated in units of TTI are encoded and combined, It is divided into slots and mapped to DPCH which is a physical channel. Note that the data length of the voice data (TRCH # 1, # 2, # 3) varies depending on the voice situation, and the data length of the control data (TRCH # 4) varies depending on whether control information is transmitted.

  FIG. 2 shows a state in which audio data is multiplexed in the slot data area (DATA1 + DATA2 = 34 bits) in slot format # 8 (format in which TFCI does not exist). As shown in FIG. 2, audio data is mapped to the data area in an arrangement (six ways) according to the TFC value (0 to 5).

  However, the slot format and the number of bits shown in FIG. 2 are examples, and differ depending on the NW parameter. For example, regarding voice data during a voice call, the contents of TRCHs # 1 to # 3 change depending on whether there is sound, background noise or silence. This depends on the voice situation of the called party. Further, the control data depends on the presence / absence of control information (handover instruction or the like) generated when maintaining the wireless line in NW1. During packet communication, it depends on the amount of packet data downloaded by the MS 2.

  FIG. 3 shows an example of a processing flow until TRCH is encoded and mapped to DPCH. Each TRCH includes CRC attachment, transport block combination / code block segmentation, channel coding, rate matching, and first DTX indication insertion (1st insertion). of DTX indication, 1st interleaving, and radio frame segmentation, transport channel multiplexing (TrCH Multiplexing), 2D insertion of DTX indication (2nd insertion of DTX indication) ), Physical channel segmentation, and second interleaving (2nd interleaving), and then mapped to a physical channel (DPCH) (Physical channel mapping).

  On the other hand, MS2 performs reception processing according to TFC (steps S4, S6, S8, S10). Here, the MS 2 needs to recognize the TFC. Conventionally, the TFC recognizes the TFC based on TFCI or BTFD. In this example, the MS 2 recognizes the TFC based on the received electric field strength distribution for each slot.

  That is, which TFC is mapped to DPCH and how can be recognized by the NW parameter notified at the start of communication, the MS2 knows the pattern of the section with data for each TFC shown in FIG. Since the transmission is ON in the section with data and the transmission is OFF in the section without data, the received electric field strength in the section with data is higher than that in the section without data.

  Therefore, when MS2 on the receiving side plots the correlation value of DPDCH despreading in time series, a high peak is obtained with many bits in a TFC with a large amount of data, and there are few peaks otherwise. In (1) to (6) of FIG. 4, the despread correlation for each TFC (0 to 5) of the despread correlation value for the DPDCH data (DATA1 + DATA2) of the DPCH slot at AMR (Adaptive Multi-Rate) 12.2 kbps. Indicates the distribution of values.

  As can be seen from FIG. 4, the number of bits and the bit position at which the peak increases are different for each TFC. Therefore, this difference makes it possible to predict the TFC (that is, the data configuration) selected on the transmission side (NW1) by the despread correlation value before performing TFCI decoding and BTFD.

  This prediction can be performed, for example, by determining which of the TFC patterns prepared in advance on the receiving side is closest (the number of coincident bits), or the number of bits for which the despread correlation value is obtained ( (In a slot) can also be performed by comparing the bit position where the despread correlation value is obtained with the bit position of the known pattern (bitmap comparison). Details of the latter will be described later as a modification of the first embodiment.

Therefore, in the example shown in FIG. 4, in the data area (DATA1 + DATA2) of the DPDCH in the slot,
(1) If a despread correlation value exceeding a predetermined threshold is not obtained in a slot, it can be determined that TFC = 0.
(2) If the despread correlation value exceeding the predetermined threshold is obtained from the 14th bit to the 17th bit and the 31st bit to the 34th bit, it can be determined that TFC = 1.
(3) TFC = 2 if the 12th to 17th bits and the 29th to 33rd bits
(4) If the 8th to 17th bits and the 25th to 33rd bits, TFC = 3,
(5) If the second bit to the tenth bit, the 14th bit to the 16th bit, the 19th bit to the 26th bit, and the 31st bit to the 33rd bit, TFC = 4,
(6) TFC = 5 if the 2nd to 16th bits and the 19th to 33rd bits
Can be determined.

  Since this prediction (discrimination) is possible at the stage when the head slot is received, it is possible to increase or decrease the downlink power by downlink power control according to the predicted data configuration.

(Configuration and operation of MS2)
FIG. 5 shows a configuration example of the MS 2 (CDMA receiver) having the above-described prediction and determination functions. The MS 2 shown in FIG. 5 includes, for example, an antenna 21, an RF unit 22, an AD converter (ADC) 23, an AGC 24, a despreading unit 25, a synchronous detection unit 26, a channel codec 27, and a TFC discrimination. Unit 28, downlink power control unit 29, and reception quality calculation unit 30, and channel codec 27 further includes TFCI decode / BTFD unit 271, deinterleave unit 272, error correction unit 273, and CRC unit 274, and TFC. The determination unit 28 includes a threshold memory 281, a comparator 282, a counter 283, an in-slot effective data number calculation unit 284, a theoretical value storage table memory 285, a difference calculation unit 286, a minimum value detection unit 287, a TFC determination unit 288, and a target SIR. A correction value calculation unit 289 is further provided.

The RF unit 22 performs necessary radio reception processing such as low noise amplification and frequency conversion (down conversion) on the signal received by the antenna 21.
The ADC 23 converts the signal from the RF unit 22 into a digital signal.

The AGC 24 performs despreading processing on the digital signal after AD conversion by the ADC 23.
The synchronous detection unit 26 performs synchronous detection on the despreading result by the despreading unit 25 and outputs the result to the channel codec 27.

  The channel codec 27 performs reception processing (channel codec processing) corresponding to the TFC on the signal input from the synchronous detection unit 26.

  That is, if the presence or absence of TFCI is set from the upper layer for the TFCI decode / BTFD unit 171 and the presence of TFCI is set, the TFCI decode / BTFD unit 171 causes the TFCI included in the signal after the synchronous detection. Is received to detect the received data configuration (downlink DPCH slot format), and the deinterleaving unit 272, the error correcting unit 273, and the CRC unit 274 are operated according to the detected data configuration, and after the synchronous detection The received signal is subjected to channel codec processing (decoding processing) and reported to the upper layer.

  On the other hand, when no TFCI is set from the upper layer for the TFCI decoding / BTFD unit 271, the deinterleaving unit 272, the error correction unit 273, and the CRC unit 274 are operated for all data configurations by BTFD. The most likely data configuration is selected based on the CRC result of the CRC unit 274, and the data subjected to the channel codec processing (decoding processing) with the data configuration is reported to the upper layer.

  The TFC determination unit 28 predicts (determines) the TFC based on the distribution (pattern) of the despread correlation value in the DPCH slot of the received signal obtained by the despreading unit 25.

  That is, at the start of communication, as shown in FIG. 6, when channel open information (TFCS) is received from an upper layer (Yes route in step S11), the in-slot valid data number calculation unit 284 Is calculated for each TFC (step S12) and stored in the theoretical value storage table memory 285 (step S13). That is, the memory 285 stores in advance a plurality of patterns (number of bits) that can be obtained according to TFC (data structure) as a result of despreading a part (slot) of a radio frame as a theoretical value of the received electric field strength distribution. Keep it.

  Thereafter, when data reception is started, the despread correlation value for each slot is input to the comparator 282. As shown in FIG. 7, the comparator 282 has a threshold value set (stored) in the threshold memory 281 in advance. (Step S21), and the counter 283 counts the number of despread correlation values exceeding the threshold value (from the Yes route of Step S21 to Step S22), whereby the despread correlation value exceeding the threshold value in the slot Is measured (the number of valid received data) (No route in step S23).

  That is, in this example, the block composed of the despreading unit 25, the threshold memory 281, the comparator 282, and the counter 283 is a slot that is a part of a radio frame (in particular, a slot before the slot in which the TFCI is inserted). Thus, it preferably functions as a measuring means for measuring the received electric field strength distribution in the first slot).

  The measurement result is input to the difference calculation unit 286, and the difference calculation unit 286 calculates the difference between the measurement result and the theoretical value stored in the theoretical value storage table memory 285 (from the Yes route in step S23 to step S24). . Since the theoretical value exists for each TFC, the difference calculation is performed for the number of TFCs (No route in step S27).

  Then, the minimum value detection unit 287 detects the minimum value of the difference calculated for the number of TFCs in this way (step S25). Since the TFC in which the minimum value is detected is considered to be closest to the TFC of the currently received slot, the TFC determination unit 288 determines the TFC as the current reception TFC (from the Yes route in step S25 to step S26).

  That is, in this example, the block consisting of each part denoted by reference numerals 284 to 288 serves as a discriminating means for discriminating the data configuration (TFC) of the radio frame based on the measurement result (received electric field strength distribution). A block composed of each part denoted by reference numerals 286 to 288 is received by comparing the measurement result obtained as a pattern obtained by receiving and despreading a part of the radio frame with the theoretical value in the theoretical value storage table memory 285. It functions as a reception data configuration determination unit that determines the TFC of the middle radio frame.

  The determined received TFC is notified to the target SIR value calculation unit 289, and the target SIR correction value calculation unit (control means) 289, as shown in FIG. 8, corrects the target SIR correction value according to the determined TFC (that is, Calculates downlink transmission power control information (step S31), and outputs it to the downlink power control unit 29 (step S32).

  When communication is performed using a downlink DPCH without TFCI, if the CRC result is NG, it is NG because there is no data and transmission is OFF, or NG because of an error in the propagation environment. It is difficult to determine whether it has occurred. Therefore, the reception quality calculation unit 30 receives the reception quality (reception error) based on the data amount that should have been received according to the determined TFC and the data amount that has actually been successfully received (CRC is OK). By calculating (rate), it is possible to grasp the accurate reception quality.

  As described above, in the MS 2 of the present embodiment, the number of bits in which the despread correlation value (peak) is visible for each TFC of the TFCS is calculated in advance as a theoretical value, and the despread correlation value exceeding the threshold is obtained. By counting the number, the TFC that is the theoretical value closest to the count value can be determined as the reception TFC.

  Therefore, for example, as schematically shown in FIG. 9, compared with the case where the TFC is determined by TFCI decoding or BTFD, when the DDPCH slot of the downlink DPCH is received (despread) for one slot (667 μs) in the shortest time, The received TFC can be determined and determined, and the downstream power control can be performed by correcting the target SIR at an early stage according to the determination result.

  That is, during reception of the same radio frame (15 slots = 10 ms), the received power of the downlink DPCH slot can be controlled (increased or decreased) according to the importance of the data included in the DPCH slot. In the case of TFCI, it is possible to determine the TFC only after receiving one radio frame. In the case of BTFD, the TFC is not received until all TTIs (n frames; n = 1, 2, 4, 8) are received. Discrimination becomes possible.

  Therefore, during reception of the same frame, for example, a TFC slot including highly important data (hereinafter referred to as important data) that is not to be missed such as DPCCH data (control data) can be received with higher power. By increasing the target SIR and increasing the downlink transmission power of NW1 by downlink power control (inner loop power control), it is possible to reduce the loss of important data.

On the other hand, for TFC slots that do not include important data, if lower power is acceptable, the target SIR can be decreased and the downlink transmission power can be reduced by downlink power control (inner loop power control). In this case, the power consumption of NW1 can be reduced.
That is, efficient power control is possible.

  For example, the data to be received during voice communication is AMR data and DPCCH data (control information). Even if AMR is omitted a little, the communication maintenance is not affected so much, so the downlink power is set low. It doesn't matter. However, for example, when an incoming mail is received during voice communication, a DPCCH is generated. If this is missed, the AMR is also disconnected. In other words, DPCCH is data that you do not want to miss.

  Therefore, if it is known that the DPCCH is being transmitted in the radio frame (TTI), it becomes possible to perform power increase control by downlink power control during the reception of the radio frame, and improve the DPCCH reception rate. Can do it.

  Also, in this example, the despreading correlation value is used for the electric field strength distribution measurement, so that the despreading processing function normally provided in the CDMA receiver can be used. The reception TFC can be determined without requiring new (special) processing. Therefore, it greatly contributes to the reduction of the circuit scale, cost, power consumption, etc. of the MS2.

[2] Description of Modified Example FIG. 10 is a block diagram showing a modified example of the above-described MS2. The MS 2 shown in FIG. 10 has a bit instead of the TFC discriminating unit 28 as compared with the configuration shown in FIG. The TFC discriminating unit 28a is provided with a map comparison. The TFC discriminating unit 28a includes the threshold memory 281 and the comparator 282 described above, a peak bit mapping unit 283a, and a peak bit in the slot. A map value calculation unit 284a, a theoretical value storage table memory 285a, a bitmap pattern matching unit 286a, a TFC determination unit 288a, and a target SIR correction value calculation unit 289a are provided. In FIG. 10, elements having the same reference numerals as those described above have the same or similar functions as the elements described above unless otherwise specified.

  In the TFC determination unit 28a of this modification, the TFC is determined by converting the despread correlation value of the received signal into a bitmap and comparing it with a theoretical value (bitmap pattern).

  That is, at the start of communication, as shown in FIG. 11, when channel open information (TFCS) is received from the upper layer by the intra-slot peak bitmap value calculation unit 284a, the calculation unit 284a performs despreading within the slot. Each bit position where a correlation value (peak) should be obtained is calculated for each TFC as a bitmap (No route in steps S41, S42 and S42) and stored in the theoretical value storage table memory 285a (from the Yes route in step S43). Step S44). That is, the memory 285a stores in advance a plurality of patterns (bitmaps) that can be obtained according to the TFC (data configuration) as a result of despreading a part (slot) of a radio frame as a theoretical value of the received electric field strength distribution. Keep it.

  Thereafter, when data reception is started, the despread correlation value for each slot is input to the comparator 282. As shown in FIG. 12, the comparator 282 has a threshold value set (stored) in the threshold memory 281 in advance. Are compared with each other (step S51). When the threshold value is exceeded, it is determined that the peak is obtained (Yes route in step S51), and when it is equal to or less than the threshold value, it is determined that the peak is not obtained (step S51). No route in step S51).

  The peak bitmap unit 283a records the determination result and converts it into a bitmap, thereby holding the bit position (bitmap) where the despread correlation value exceeding the threshold is obtained (steps S52 and S53).

  That is, in this example, a block including the despreading unit 25, the threshold memory 281, the comparator 282, and the peak bitmapping unit 283a is a slot that is a part of a radio frame (particularly, before the slot in which the TFCI is inserted). And preferably functions as a measuring means for measuring the received electric field intensity distribution of the first slot).

  The bitmap pattern collation unit 286a compares (collates) the held bitmap pattern with the theoretical value of the bitmap pattern stored in the theoretical value storage table memory 285a, thereby determining the bit position that matches the theoretical value. The number is counted (from the Yes route of step S54 to step S55). Since the theoretical value exists for each TFC, the matching is repeated for the number of TFCs (No route in steps S56 and S57).

  Then, the TFC determination unit 288a receives the collation result, and determines that the TFC having the maximum match count number is closest to the TFC of the currently received slot, and therefore determines the TFC as the current reception TFC. (Step S58).

  That is, in this example, the block composed of each part denoted by reference numerals 284a to 286a, 288a functions as a discriminating unit that discriminates the data configuration (TFC) of the radio frame based on the measurement result (received electric field strength distribution). By comparing the measurement result obtained as a pattern resulting from receiving and despreading a part of the radio frame with the block composed of each part denoted by reference numerals 286a and 288a, and the theoretical value in the theoretical value storage table memory 285a. It functions as a received data configuration determining unit that determines the TFC of the radio frame being received.

  The determined received TFC is notified to the target SIR value calculation unit 289a, and the target SIR correction value calculation unit (control means) 289, as shown in FIG. 13, corrects the target SIR according to the determined TFC (that is, the correction value). Calculates downlink transmission power control information (step S61) and outputs it to the downlink power control unit 29 (step S62).

  As described above, in the MS2 of this modification, the bit position where the peak should be seen for each TFC of the TFCS is calculated in advance as a theoretical value, and the theoretical value closest to the bit position at which the despread correlation value exceeding the threshold is obtained. The value TFC can be determined as the reception TFC.

Therefore, also in this modification, the same effect as the above-described embodiment can be obtained.
For example, as shown in FIG. 9, reception is performed at the time of receiving (despreading) one DPDTCH slot of the downlink DPCH for one slot (667 μs) as compared with the case where the reception TFC is determined by TFCI decoding or BTFD. The TFC can be determined, and the target SIR is corrected according to the determination result, so that the received power of the downlink DPCH slot can be changed during the reception of the same frame (15 slots: 10 ms). It is possible to control (increase / decrease) according to the importance level.

[3] Others In the embodiment and the modification described above, when the TFC in one frame is fixed, the bit position where a peak should be obtained in the same TFC may be different by 1 bit in each slot, but is almost the same. . Therefore, for example, as schematically shown in FIG. 14, the despread correlation values of partial data for a plurality of slots (three slots in FIG. 14) in the same frame are synthesized (added (integrated)), and then the theoretical value is obtained. If the corresponding threshold determination (comparison by the comparator 282) is performed, the error received from the radio propagation path can be corrected, and the reliability of TFC determination can be improved.
The following additional remarks are disclosed regarding the above embodiment and its modifications.
[4] Appendix
(Appendix 1)
A receiver that receives a radio frame from a transmitter that transmits a radio frame with a plurality of types of data configurations,
Measuring means for measuring a received electric field strength distribution of a part of the radio frame;
Determining means for determining the data configuration of the radio frame based on the distribution measured by the measuring means;
A receiver characterized by having
(Appendix 2)
The discrimination means includes
A memory that stores in advance as a theoretical value of the received electric field strength distribution a plurality of patterns that can be taken according to the data configuration of a part of the despreading result of the radio frame;
Reception for determining the data structure of the radio frame being received by comparing the measurement result of the measurement means obtained as a pattern resulting from receiving and despreading a part of the radio frame and the theoretical value in the memory A data structure determination unit;
The receiver according to appendix 1, characterized by comprising:
(Appendix 3)
The discrimination means includes
3. The receiver according to appendix 2, wherein the comparison uses a result of combining the measurement results of a plurality of partial data that are a part of the radio frame.
(Appendix 4)
A receiver that receives a radio frame from a transmitter that transmits a radio frame with a plurality of types of data configurations,
Discriminating means for measuring a received electric field strength distribution of a part of the radio frame;
Discrimination means for discriminating a data configuration of the radio frame based on the distribution measured in the discrimination;
Control means for controlling the transmission power of the radio frame from the transmitter according to the data configuration determined by the determination means;
A receiver characterized by having
(Appendix 5)
The discrimination means includes
A memory that stores in advance as a theoretical value of the received electric field strength distribution a plurality of patterns that can be taken according to the data configuration of a part of the despreading result of the radio frame;
Reception for determining the data structure of the radio frame being received by comparing the measurement result of the measurement means obtained as a pattern resulting from receiving and despreading a part of the radio frame and the theoretical value in the memory A data structure determination unit;
The receiver according to appendix 4, wherein the receiver is provided.
(Appendix 6)
The discrimination means includes
6. The receiver according to appendix 4 or 5, wherein the comparison uses a result of combining the measurement results of a plurality of partial data that are a part of the radio frame.
(Appendix 7)
The control means includes
The reception according to any one of appendices 4 to 6, wherein the transmission power is controlled to decrease when the data configuration determined by the determination means indicates that the data does not include highly important data. Machine.
(Appendix 8)
The discrimination means includes
The receiver according to any one of appendices 4 to 7, wherein the transmission power is controlled to increase when the data configuration determined by the determination means indicates that data having high importance is included. .
(Appendix 9)
The radio frame includes a plurality of time-division multiplexed slots.
The measuring means includes
9. The receiver according to any one of appendices 1 to 8, wherein the received electric field strength distribution of a slot preceding a slot into which information specifying the data configuration is inserted is measured.
(Appendix 10)
The receiver according to appendix 9, wherein the slot for measuring the received electric field strength distribution is a head slot of the radio frame.
(Appendix 11)
Supplementary notes 1 to 3, further comprising reception quality calculation means for calculating reception quality based on the data amount to be received with the data structure determined by the determination means and the actual reception data amount. The receiver according to any one of 10.
(Appendix 12)
A reception processing method in a receiver that receives the radio frame from a transmitter that transmits a radio frame with a plurality of types of data configurations,
Measure the received field strength distribution of a part of the radio frame,
Determining a data configuration of the radio frame based on the measured distribution;
A reception processing method.
(Appendix 13)
A reception processing method in a receiver that receives the radio frame from a transmitter that transmits a radio frame with a plurality of types of data configurations,
Measure the received field strength distribution of a part of the radio frame,
Determining a data structure of the radio frame based on the measured distribution;
Controlling transmission power of the radio frame from the transmitter according to the determined data configuration;
A reception processing method.

  As described above in detail, according to the present invention, the reception data configuration can be determined on the data reception side based on the received electric field strength distribution, so that the reception data configuration can be recognized earlier than before. Thus, efficient processing (downlink power control or the like) according to the received data configuration can be performed at an early stage. Therefore, it is considered extremely useful in the field of wireless communication technology.

Claims (5)

A receiver that receives a radio frame from a transmitter that transmits a radio frame with a plurality of types of data configurations,
Measuring means for measuring a received electric field strength distribution of a part of the radio frame;
Determining means for determining the data configuration of the radio frame based on the distribution measured by the measuring means;
With
The discrimination means includes
A memory that stores in advance as a theoretical value of the received electric field strength distribution a plurality of patterns that can be taken according to the data configuration of a part of the despreading result of the radio frame;
Reception for determining the data structure of the radio frame being received by comparing the measurement result of the measurement means obtained as a pattern resulting from receiving and despreading a part of the radio frame and the theoretical value in the memory A receiver comprising a data structure determination unit. The discrimination means includes
The receiver according to claim 1, wherein the comparison uses a result of combining the measurement results of a plurality of partial data that are a part of the radio frame. The radio frame includes a plurality of time-division multiplexed slots.
The measuring means includes
The receiver according to claim 1, wherein the received electric field strength distribution of a slot before a slot into which information specifying the data configuration is inserted is measured. A receiver that receives a radio frame from a transmitter that transmits a radio frame with a plurality of types of data configurations,
Measuring means for measuring a received electric field strength distribution of a part of the radio frame;
Determining means for determining the data configuration of the radio frame based on the distribution measured by the measuring means;
The radio frame includes a plurality of time-division multiplexed slots.
The measuring means includes
Measuring the received electric field strength distribution in a slot before a slot into which information specifying the data configuration is inserted;
A receiver characterized by that. A reception processing method in a receiver that receives the radio frame from a transmitter that transmits a radio frame with a plurality of types of data configurations,
Measure the received field strength distribution of a part of the radio frame,
A plurality of patterns that can be taken according to the data configuration of a result of partial despreading of the radio frame are stored in advance as theoretical values of the received electric field strength distribution,
The results of the previous Kihaka constant obtained as a pattern of the result of despreading by receiving part of the radio frame, by comparison with the previous cut theory value, to determine the data structure of the radio frame being received,
A reception processing method.

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