JP5369884B2 - Radio base station and data processing method in radio base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To process receiving data from as many terminal devices as possible even when there is an upper limit in data transfer capacity of a specific signal route inside a radio base station. <P>SOLUTION: A radio part 20 converts a radio signal received from each of a plurality of terminal devices into the receiving data of a base band. A synchronous detection-processing part 43 synchronous-detects the receiving data. An SIR measuring part 45 measures a radio communication quality (SIR) of the receiving data. A channel decoding part 50 obtains the receiving data (RXdata) from the synchronous detection-processing part 43 via the signal route having fixed data transfer capacity, and decodes the obtained receiving data. A transfer data control part 46 controls an amount of transfer data of the receiving data transferred from the synchronous detection-processing part 43 via the signal route based on the radio communication quality of the receiving data so that the total amount of data transferred via the signal route does not exceed the fixed data transfer capacity. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a data processing technique for received data in a radio base station.

  In recent years, a W-CDMA (Wideband Code Division Multiple Access) system has been used as a radio access system for mobile communication (see, for example, Patent Document 1). FIG. 11 shows a general configuration of a W-CDMA wireless base station (BTS: Base Transceiver Station). A W-CDMA wireless base station mainly includes a wireless unit 120 and a baseband receiving unit 131. The radio unit 120 mainly includes a band limiting unit 121, an LNA (Low Noise Amplifier) 122, a frequency converter 123, an A / D (Analog to Digital) converter 124, and an antenna 125. doing. The baseband receiver 131 mainly includes a RAKE receiver 140, a channel decoding unit 150, a code generator 160, a memory 170, and a delay profile measuring unit 180.

  In radio section 120, a transmission signal subjected to spreading processing in UE (User Equipment: for example, a user apparatus such as a mobile communication terminal apparatus) (not shown) is received by antenna 125. The received signal received by the antenna 125 is band limited by the band limiting unit 121. Further, the received signal is amplified by the LNA 122 and then input to the frequency converter 123. A local oscillator signal from a local oscillator (not shown) is input to the frequency converter 123. In the frequency converter 123, the received signal is frequency-converted using the local signal. As a result, a received signal in the baseband frequency band is obtained. Further, the received signal is converted into digital data (received data) by the A / D converter 124. The received data is input to the RAKE receiving unit 140 and also input to the delay profile measuring unit 180 via the memory 170.

  The delay profile measurement unit 180 mainly includes a matched filter (correlator) 181, an averaging processing unit 182, and a delay amount / path number detection unit 183. In the radio base station (reception side), the uplink data spreading code used by the UE (transmission side) is known. The spread code is provided from the code generation unit 160 to the delay profile measurement unit 180 via the memory 170. The matched filter 181 performs correlation calculation between the received data acquired from the memory 170 and the spreading code. The averaging processing unit 182 averages the result of the correlation calculation by the matched filter 181 and outputs the number (correlation value) that the received data and the spreading code match. Thereby, delay profile data as a parameter representing the spread in the time direction of the delay amount of the signal transmitted from the UE is output. The delay amount / path number detection unit 183 detects an incoming wave and a delay time from input delay profile data, and calculates a path timing corresponding to a time delay interval between the direct incoming wave and the delayed incoming wave, The path timing is output to the RAKE receiving unit 140. As described above, the delay profile measuring unit 180 executes the path search function in the radio base station, detects the path timing (arrival time) of the uplink data transmitted by the UE from the delay profile data, and sends the path timing to the RAKE receiving unit 140. To be notified.

  The RAKE receiving unit 140 mainly includes a despreading processing unit 141, a despreading code generating unit 142, a synchronous detection processing unit 143, and a CH (Channel) estimation processing unit 144. The despreading processing unit 141 acquires the path timing from the delay amount / path number detection unit 183, matches the beginning of the replica code (despreading code) from the despreading code generation unit 142 with the beginning of the received data, and receives Correlation detection is performed by synchronizing data with the replica code. The despreading processing unit 141 has a despreading circuit for each of the direct arrival wave and the delayed arrival wave. Each despreading circuit demodulates the received data by taking the correlation between the received data and the spreading code at the path timing notified from the delay profile measuring unit 180. The CH estimation processing unit 144 detects the amplitude / phase fluctuation amount (channel fluctuation amount) due to fading using, for example, pilot symbols whose amplitude and phase are known in advance. Further, the synchronous detection processing unit 143 compensates and compensates the received data demodulated by each despreading circuit based on the amplitude / phase fluctuation amount (channel fluctuation amount) detected by the CH estimation processing unit 144. The received data is synthesized. As described above, the received data after the despreading process, that is, the original data is extracted. The received data RXdata demodulated by the RAKE receiving unit 140 is decoded by the channel decoding unit 150. Specifically, processes such as Viterbi decoding, error correction, and rate matching are performed.

  FIG. 12 shows uplink data (radio frame) transmitted from the UE and received data RXdata transferred from the RAKE receiving unit 140 to the channel decoding unit 150. The uplink data and the reception data RXdata are composed of a basic frame (Frame) having a frame length of 10 ms. One frame consists of 15 slots and stores user data and control information. A processing delay due to synchronous detection processing or the like occurs until the uplink data is received by the radio base station and the received data RXdata is demodulated by the RAKE receiving unit 140. Also, a transfer delay occurs when the received data RXdata is transferred from the RAKE receiving unit 140 to the channel decoding unit 150.

JP 2008-283320 A

  By the way, for the transfer of the received data RXdata from the RAKE receiving unit 140 to the channel decoding unit 150, the upper limit of the transfer capacity is determined by the data bus (parallel or serial). For this reason, the number of UEs (number of calls) that can be processed simultaneously in the baseband receiving unit 131 is limited. That is, the printed circuit board 1 on which the baseband receiving unit 131 is mounted because the data transfer capacity (or data transfer band) becomes a bottleneck even when the processing amount of the RAKE receiving unit 140 and the channel decoding unit 150 is sufficient. It is difficult to increase the number of processing UEs per sheet.

This point is specifically described as follows.
For example, when the system chip rate is 3.84 Mcps and the spreading factor (SF) is 16, the symbol rate is 240 ksps obtained by dividing 3.84 Mcps by 16. At this time, 160 symbols are included per one slot unit time (666.66 μs). Here, assuming that one symbol is 16-bit fixed point data and the data transfer capacity of the data bus is 400 Mbps, the upper limit of the number of processing UEs that can be processed in one slot unit time is determined to be 104 UEs. If the data transfer capacity is increased in order to increase the upper limit of the number of processing UEs, measures to increase the bus width and increase the clock speed can be considered. However, if such a measure is taken, it results in an increase in circuit scale due to an expansion of the bus width by a high-speed clock, a significant change in a circuit for processing received data, and the like. For this reason, there is a request to increase the upper limit of the number of processing UEs without increasing the data transfer capacity.

  Therefore, in one aspect of the invention, a radio base station and a radio base station that can process received data from as many terminal devices as possible even when there is an upper limit on the data transfer capacity of a specific signal path in the radio base station An object of the present invention is to provide a data processing method.

In a first aspect, a radio base station is provided.
This radio base station
(A) a radio unit that converts radio signals received from each of a plurality of terminal devices into baseband received data;
(B) a synchronous detector for synchronously detecting the received data;
(C) a communication quality measuring unit that measures the wireless communication quality of the received data;
(D) Reception transferred from the synchronous detection unit via the signal path so that the total amount of data transferred via the signal path having a fixed data transfer capacity does not exceed the fixed data transfer capacity A data control unit that controls the amount of data transferred based on the wireless communication quality of the received data;
Is provided.
In a second aspect, there is provided a data processing method in a radio base station that performs the same operation as each unit of the radio base station.

  Even when there is an upper limit on the data transfer capacity of a specific signal path in the radio base station, it is possible to process received data from as many terminal devices as possible.

The block diagram which shows schematic structure of the wireless base station as 1st Embodiment. The flowchart explaining transfer data control. Schematic explaining the memory mapping of transfer data. Schematic explaining the memory mapping of transfer data. Schematic explaining the memory mapping of transfer data. The block diagram which shows schematic structure of the wireless base station as 2nd Embodiment. The flowchart explaining transfer band control. Schematic explaining the outline of control of transfer data. The block diagram which shows schematic structure of the wireless base station as 3rd Embodiment. The flowchart explaining transfer band control. The block diagram which shows schematic structure of the radio base station as background art. Schematic explaining the slot frame structure of W-CDMA.

<First Embodiment>
The radio base station as the first embodiment will be described with reference to FIGS. FIG. 1 shows a configuration of a W-CDMA (Wideband Code Division Multiple Access) system radio base station (BTS: Base Transceiver Station). A W-CDMA wireless base station mainly includes a wireless unit 20 and a baseband processing card (an example of a first processing unit) 30. The radio unit 20 performs radio communication with a plurality of UEs (User Equipment: for example, user apparatuses such as mobile communication terminal apparatuses) (not shown) by the W-CDMA system. The radio unit 20 mainly includes a band limiting unit 21, an LNA (Low Noise Amplifier) 22, a frequency converter 23, an A / D (Analog to Digital) converter 24, and an antenna 25. doing. The baseband processing card processes received data of the UE received via the radio unit 20. The baseband processing card 30 mainly includes a baseband receiving unit 31 and an MPU (Micro Processing Unit) 32. The baseband processing card 30 is, for example, a printed circuit board on which the baseband receiving unit 31 and the MPU 32 are mounted. The baseband receiving unit 31 mainly includes a RAKE receiving unit 40, a channel decoding unit 50 (an example of a decoding unit), a code generating unit 60, a memory 70, and a delay profile measuring unit 80. ing.

  The radio unit 20 receives the transmission signal subjected to spreading processing in the UE by the antenna 25. The received signal received by the antenna 25 is band limited by the band limiting unit 21. Further, the received signal is amplified by the LNA 22 and then input to the frequency converter 23. The frequency converter 23 receives a local oscillation signal from a local oscillator (not shown). In the frequency converter 23, the received signal is frequency-converted using the local signal. As a result, a received signal in the baseband frequency band is obtained. Further, the received signal is converted into digital data (received data) by the A / D converter 24. The received data is input to the RAKE receiving unit 40 and also input to the delay profile measuring unit 80 via the memory 70.

  The delay profile measurement unit 80 mainly includes a matched filter (correlator) 81, an averaging processing unit 82, and a delay amount / path number detection unit 83. In the radio base station (reception side), the uplink data spreading code used by the UE (transmission side) is known. The spread code is provided from the code generation unit 60 to the delay profile measurement unit 80 via the memory 70. The matched filter 81 performs a correlation operation between the received data acquired from the memory 70 and the spreading code. The averaging processing unit 82 averages the result of the correlation calculation by the matched filter 81, and outputs the number (correlation value) in which the received data matches the spread code. Thereby, delay profile data as a parameter representing the spread in the time direction of the delay amount of the signal transmitted from the UE is output. The delay amount / path number detection unit 83 detects an incoming wave and a delay time from input delay profile data, and calculates a path timing corresponding to a time delay interval between the direct incoming wave and the delayed incoming wave, The path timing is output to the RAKE receiving unit 40. As described above, the delay profile measuring unit 80 executes the path search function in the radio base station, detects the path timing (arrival time) of the uplink data transmitted by the UE from the delay profile data, and sends the path timing to the RAKE receiving unit 40. To be notified.

  The RAKE receiving unit 40 includes a despreading processing unit 41, a despreading code generating unit 42, a synchronous detection processing unit 43 (an example of a synchronous detection unit), a CH (Channel) estimation processing unit 44, and an SIR (Signal to Interference Ratio: a desired wave-to-interference wave ratio measurement unit (an example of a communication quality measurement unit) 45 and a transfer data control unit (an example of a data control unit) 46 are mainly included. The despreading processing unit performs despreading processing on the received data. Specifically, the despreading processing unit 41 acquires the path timing from the delay amount / path number detection unit 83, and the beginning of the replica code (despreading code) from the despreading code generation unit 42 and the beginning of the received data And the received data is synchronized with the replica code to detect the correlation. The despreading processing unit 41 has a despreading circuit for each of the direct arrival wave and the delayed arrival wave. Each despreading circuit demodulates the received data by taking the correlation between the received data and the spreading code at the path timing notified from the delay profile measuring unit 80. The CH estimation processing unit 44 detects the amplitude / phase fluctuation amount (channel fluctuation amount) due to fading using, for example, pilot symbols whose amplitude and phase are known in advance. Further, the synchronous detection processing unit 43 compensates and compensates the received data demodulated by each despreading circuit based on the amplitude / phase fluctuation amount (channel fluctuation amount) detected by the CH estimation processing unit 44. The received data is synthesized. As described above, the synchronous detection processing unit 43 extracts the RAKE-combined received data after despreading processing, that is, the original data. This received data has, for example, the same format as the conventional one described with reference to FIG. That is, the received data is composed of a basic frame (Frame) having a frame length of 10 ms. One frame is composed of 15 slots, and stores user data and control information. For example, when the system chip rate is 3.84 Mcps and the spreading factor (SF) is 16, the symbol rate is 240 ksps obtained by dividing 3.84 Mcps by 16. At this time, 160 symbols are included per one slot unit time (666.66 μs). Here, one symbol includes 16-bit fixed point data.

  Based on the received data demodulated by the despreading processing unit 41, the SIR measurement unit 45 calculates SIR indicating the radio communication quality for each channel (for each UE). The SIR is calculated as a ratio between the power of the desired signal and the power of the interference signal included in the received data. As for the specific calculation, since a conventionally known calculation method using a reference signal (pilot signal or the like) can be used, detailed description is omitted here. Although the SIR measurement unit 45 calculates the SIR based on the reception data demodulated by the despreading processing unit 41, the reception data after RAKE combining, that is, the reception data as the output of the synchronous detection processing unit 43 is used. Thus, the SIR for each channel may be calculated.

  The transfer data control unit 46 controls the data amount of the reception data for each channel output from the synchronous detection processing unit 43 using the SIR for each channel calculated by the SIR measurement unit 45. Further, the transfer data control unit 46 outputs the reception data whose data amount is controlled as transfer data RXdata. Specifically, in the transfer data control unit 46, the total amount of the transfer data RXdata does not exceed a certain data transfer capacity (or data transfer band) between the RAKE receiving unit 40 and the channel decoding unit 50. In this way, the transfer data amount of the received data is controlled.

  FIG. 2 is a flowchart for explaining transfer data control of the transfer data control unit 46. The transfer data control unit 46 performs the transfer data control shown in FIG. 2 on the received data for each channel (for each UE) to reduce the transfer data amount of the received data. Specifically, the transfer data control unit 46 acquires the SIR for each channel calculated by the SIR measurement unit 45 (step S11). Next, the transfer data control unit 46 determines whether or not the acquired SIR is greater than or equal to a predetermined threshold value set in advance (step S12). When the SIR is equal to or higher than a predetermined threshold, that is, when the wireless communication quality of the received data is good (Yes in step S12), the transfer data amount of each symbol of the received data is reduced from 16 bits to the upper 12 bits, and the output bit (Step S13). That is, the transfer data control unit 46 thins out the lower 4 bits of the data of each symbol of the received data. On the other hand, if the SIR is less than the predetermined threshold, that is, if the wireless communication quality of the received data is not good (No in step S12), the data amount of each symbol of the received data is maintained at 16 bits and output as an output bit. (Step S14). Note that the processing of steps S11 to S14 can be performed for each slot of received data of each channel. As a result, the data amount of each symbol of the received data can be appropriately controlled for each slot.

  Note that when the wireless communication quality of the received data is good, a high decoding gain can be obtained. Therefore, even if the transfer data amount of each symbol of the received data is thinned, the decoding result does not deteriorate greatly.

  The MPU 32 controls the transfer band of the transfer data RXdata output from the transfer data control unit 46, controls the transfer timing, and the like. For example, the MPU 32 monitors the sum of the data amount of the transfer data RXdata and determines the margin of the data transfer capacity of the data bus between the transfer data control unit 46 and the channel decoding unit 50 with respect to the sum of the data amount. . When the MPU 32 determines that the data transfer capacity of the data bus between the transfer data control unit 46 and the channel decoding unit 50 is sufficient, the MPU 32 uses the free data transfer capacity to Performs reception processing (data transfer) of another UE.

  3 to 5 are schematic diagrams for explaining the configuration of the transfer data RXdata output from the transfer data control unit 46. Specifically, FIGS. 3 to 5 show an example of memory mapping of the transfer data RXdata to the memory referred to by the channel decoding unit 50 when data is transferred from the transfer data control unit 46 to the channel decoding unit 50. Yes. FIG. 3 shows a memory mapping example of output bits for one slot when the data amount of each symbol is maintained at 16 bits as described in step S14 of FIG. The output bit shown in FIG. 3 includes a header including information indicating that each symbol is transferred with a 16-bit width, and 160 symbols each having a 16-bit width. As shown in FIG. 3, when each symbol is transferred with a 16-bit width, the memory referenced by the channel decoding unit 50 stores four symbols per address. FIG. 4 shows an example of memory mapping of output bits for one slot when the data amount of each symbol is reduced to 12 bits as described in step S13 of FIG. The output bit shown in FIG. 4 includes a header including information indicating that each symbol is transferred with a 12-bit width, and 160 symbols each having a 12-bit width. As shown in FIG. 4, when each symbol is transferred with a 12-bit width, the memory referenced by the channel decoding unit 50 stores five symbols per address. FIG. 5 shows a mixture of channels (UE # 2, UE # 3) determined to have good radio communication quality and channels (UE # 1, UE # 4) determined to have poor radio communication quality. In this case, a memory mapping example of transfer data RXdata output from the transfer data control unit 46 per one slot unit time is shown.

  As shown in FIG. 4, when transferring each symbol with a 12-bit width, 5 symbols are transferred per address. On the other hand, as shown in FIG. 3, when each symbol is transferred with a 16-bit width, four symbols are transferred per address. For this reason, when each symbol is transferred with a 12-bit width, transfer of about 1.25 times can be realized as compared with a case where each symbol is transferred with a 16-bit width. That is, even when there is an upper limit on the data transfer capacity of the data bus between the transfer data control unit 46 and the channel decoding unit 50 (for example, 400 Mbps), the data amount of each symbol transferred with a 16-bit width is set. By reducing and transferring with a 12-bit width, the number of processing UEs can be increased.

A specific example will be described as follows.
For example, when the system chip rate is 3.84 Mcps and the spreading factor (SF) is 16, the symbol rate is 240 ksps obtained by dividing 3.84 Mcps by 16. At this time, 160 symbols are included per one slot unit time (666.66 μs). Here, assuming that one symbol is 16-bit fixed point data and the data transfer capacity of the data bus is 400 Mbps, the upper limit of the number of processing UEs that can be processed in one slot unit time is determined to be 104 UEs. Here, when each symbol is transferred in a 12-bit width, the upper limit of the number of processable UEs can be increased to 130 UEs (= 104 × 1.25) without changing the data transfer capacity. Become.

  The channel decoding unit 50 decodes the transfer data RXdata demodulated by the RAKE receiving unit 40. Specifically, processes such as Viterbi decoding, error correction, and rate matching are performed. More specifically, the channel decoding unit 50 determines whether each symbol is transferred with a 16-bit width or a 12-bit width from the header at the head address of the transfer data RXdata. Furthermore, when each symbol of a certain channel in the transfer data RXdata is transferred with a 16-bit width, the channel decoding unit 50 performs a decoding process for each 16-bit symbol. When each symbol is transferred with a 12-bit width, the channel decoding unit 50 performs 4-bit zero padding on the lower side of each symbol, converts each symbol to 16 bits, and performs a decoding process. For example, when the value of a 12-bit width symbol is [0xFFF], 4-bit [0000] is embedded in the lower side of the value [0xFFF], and [0xFFF0] is converted to 16 bits, and then decoding processing is performed.

  As described above, in the wireless base station as the first embodiment, when the wireless communication quality of received data is good, the decoding result is large even if the amount of transfer data of each symbol of the received data is thinned out. Focusing on the fact that it does not deteriorate, the amount of transfer data is controlled based on the wireless communication quality of the received data. For this reason, the baseband processing card 30 can increase the number of processing UEs without increasing the data transfer clock speed or the data bus bus width even when the data transfer capacity of the data bus has an upper limit, for example. It becomes. In other words, the number of baseband processing cards 30 required for processing the same number of UEs can be reduced.

<Second Embodiment>
The radio base station as the second embodiment will be described with reference to FIGS. Note that the same reference numerals as those shown in FIG. 1 are given to the parts that perform the same processing as the parts constituting the radio base station of the first embodiment described with reference to FIG. Is omitted.
The radio base station shown in FIG. 6 includes a plurality of (three in FIG. 6) first, second, and third baseband processing cards (an example of the first processing unit and the second processing unit) 30a, 30b, and 30c. Have. The first to third baseband processing cards 30a to 30c have the same configuration as the baseband processing card 30 described with reference to FIG. The first to third baseband processing cards 30a to 30c perform inter-MPU communication with each other by the respective MPUs 32.

  FIG. 7 is a flowchart illustrating transfer band control of the MPU 32 of each of the first to third baseband processing cards 30a to 30c. For example, the MPU 32 of the first baseband processing card 30a acquires, from the transfer data control unit 46, the SIR for each UE that is controlled by the transfer data control unit 46 (see FIG. 2) (step S21). . Further, when the SIR of a certain UE under transfer data control deteriorates and the MPU 32 cancels the 12-bit width transfer (bit reduction mode) and returns to the 16-bit width transfer, the MPU 32 receives it at the first baseband processing card 30a. It is determined whether or not the total amount of transfer data RXdata of all UEs that are processing exceeds the upper limit of the transfer bandwidth between the transfer data control unit 46 and the channel decoding unit 50 (step S22).

  Specifically, the MPU 32 determines whether or not the SIR of each UE during transfer data control is greater than or equal to the predetermined threshold used in step S12 of FIG. When the SIR of a certain UE is less than a predetermined threshold, that is, when the radio communication quality of a certain UE is not good, the first baseband processing card 30a assumes that the received data of the UE is transferred with a 16-bit width. The sum of the data amounts of the transfer data RXdata of all UEs that are performing reception processing is calculated. Further, the MPU 32 determines whether or not the sum of the data amounts of the transfer data RXdata exceeds a predetermined threshold (transfer band upper limit value). When the sum of the data amounts of the transfer data RXdata exceeds a predetermined threshold (Yes in Step S22), the MPU 32 moves the reception process of the UE to the second or third baseband processing card 30b or 30c (Step S23). . Specifically, the MPU 32 of the first baseband processing card 30a communicates with the MPU 32 of the second and third baseband processing cards 30b and 30c in the second and third baseband processing cards 30b and 30c. The margin of the data transfer capacity between the transfer data control unit 46 and the channel decoding unit 50 is determined. Further, the MPU 32 of the first baseband processing card 30a determines that the UE that is controlling the transfer data by using the first baseband processing card 30a is transferred to the second and third baseband processing cards 30b and 30c having a sufficient data transfer capacity. Reception processing is performed by either one. On the other hand, when the sum total of the data amount of the transfer data RXdata is equal to or less than the predetermined threshold value (the upper limit value of the transfer band) (No in step S22), the MPU 32 continues the reception process of the UE by the first baseband processing card 30a. The received data of the UE is transferred from the transfer data control unit 46 to the channel decoding unit 50 with a 16-bit width.

  Next, the movement of the reception process between the first baseband processing card 30a and the second baseband processing card 30b will be specifically described with reference to FIG. For example, as shown in FIG. 8 (A), each symbol has a 16-bit width due to restrictions on the data transfer capacity of the data bus between the transfer data control unit 46 and the channel decoding unit 50 of the first baseband processing card 30a. , It is assumed that the number of processing UEs per slot unit time is 96 (UE # 1 to UE # 96) (in the specific example described above, theoretically processing is possible up to 108 UEs). When the radio communication quality of each UE being received by the first baseband processing card 30a is good, each symbol of the received data of each UE is transferred with a 12-bit width. Thereby, as shown to FIG. 8 (B), the number of process UE has increased to 130 (UE # 1-UE # 130). When the MPU 32 of the first baseband processing card 30a detects that the radio communication quality of the UE # 100 that has transferred each symbol in the 12-bit width has deteriorated, the symbol in the received data of the UE # 100 is transferred in the 16-bit width. Assuming that, the total amount of transfer data RXdata is predicted. Further, the MPU 32 determines whether or not the total sum of the predicted transfer data RXdata exceeds the upper limit of the data transfer capacity. For example, as shown in FIG. 8C, if each symbol of the received data of UE # 100 is transferred with a 16-bit width and the upper limit of the data transfer capacity is exceeded, as shown in FIG. The MPU 32 of the baseband processing card 30a (card # 1 in FIG. 8) moves the reception processing of the UE # 100 to another second baseband processing card 30b (card # 2 in FIG. 8).

As described above, in the radio base station according to the second embodiment, the number of processing UEs in each of the first to third baseband processing cards 30a to 30c is transferred by data transfer processing using FIG. This can be maximized under the restriction of the data transfer capacity of the data bus between the unit 46 and the channel decoding unit 50. Furthermore, in each of the first to third baseband processing cards 30a to 30c, when the data transfer amount is predicted to exceed the data transfer capacity while performing efficient data transfer according to the wireless communication quality It is possible to communicate directly between the MPUs 32 of the first to third baseband processing cards 30a to 30c and move the reception processing of each UE.
In the second embodiment, the movement of the UE reception process from the first baseband processing card 30a to the second or third baseband processing card 30b, 30c has been described. However, the second or third baseband process The same applies to the transfer of reception processing from the cards 30b and 30c to other baseband processing cards. Furthermore, in the second embodiment, the case where the radio base station has three first to third baseband processing cards 30a to 30c has been described. However, the processing described in the second embodiment is based on baseband processing. The same applies to the case where the number of cards is a plurality other than three.

<Third Embodiment>
A radio base station as the third embodiment will be described with reference to FIGS. In addition, about the part which performs the process similar to each part which comprises the radio base station as 1st and 2nd embodiment demonstrated using FIG.1 and FIG.6, it is the same as having shown in FIG.1 and FIG.6. The detailed description is abbreviate | omitted.
The radio base station illustrated in FIG. 9 includes a plurality of (n in FIG. 9) first to nth baseband processing cards 30a to 30d. The first to n-th baseband processing cards 30a to 30d have the same configuration as the baseband processing card 30 described with reference to FIG. Further, the radio base station communicates with the MPU 32 of each of the first to nth baseband processing cards 30a to 30d, and manages the reception processing of the first to nth baseband processing cards 30a to 30d. It has a card 90 (an example of a management unit).

  FIG. 10 is a flowchart for explaining transfer band control executed by the MPU 32 of each of the first to nth baseband processing cards 30a to 30d and the base station resource management card 90. The in-base station resource management card 90 collects resource management information from each baseband processing card via the MPU 32 of each of the first to nth baseband processing cards 30a to 30d (step S31). Specifically, the base station resource management card 90 determines the data amount of the transfer data RXdata between the transfer data control unit 46 and the channel decoding unit 50 of each of the first to nth baseband processing cards 30a to 30d. Monitor the sum. When the MPU 32 of each baseband processing card degrades the SIR of a certain UE that is receiving data from the baseband processing card, the 12-bit width transfer (bit reduction mode) is canceled and the 16-bit width transfer is restored. In addition, whether the sum of the data amounts of the transfer data RXdata of all UEs that are receiving processing by the baseband processing card exceeds the upper limit of the transfer band between the transfer data control unit 46 and the channel decoding unit 50 It is determined whether or not (step S32).

  Hereinafter, as an example, the processing of the MPU 32 of the first baseband processing card 30a will be described. The MPU 32 of the first baseband processing card 30a sends the SIR for each UE that the transfer data control unit 46 of the first baseband processing card 30a controls the transfer data (see FIG. 2) from the transfer data control unit 46. get. Further, when the SIR of a certain UE under transfer data control deteriorates and the MPU 32 cancels the 12-bit width transfer (bit reduction mode) and returns to the 16-bit width transfer, the MPU 32 receives it at the first baseband processing card 30a. It is determined whether or not the sum of the data amounts of the transfer data RXdata of all UEs that are processing exceeds the upper limit of the transfer band between the transfer data control unit 46 and the channel decoding unit 50 (step S32). More specifically, the MPU 32 determines whether or not the SIR of each UE during transfer data control is greater than or equal to the predetermined threshold used in step S12 of FIG. When the SIR of a certain UE is less than a predetermined threshold, that is, when the radio communication quality of a certain UE is not good, the first baseband processing card 30a assumes that the received data of the UE is transferred with a 16-bit width. The sum of the data amounts of the transfer data RXdata of all UEs that are performing reception processing is calculated. Further, the MPU 32 determines whether or not the sum of the data amounts of the transfer data RXdata exceeds a predetermined threshold (transfer band upper limit value). When the sum of the data amount of the transfer data RXdata exceeds a predetermined threshold (Yes in step S32), the base station apparatus resource management card 90 performs the UE reception processing on the second to nth baseband processing cards 30b to 30d. (Step S33). Specifically, the base station resource management card 90 communicates with the MPU 32 of the second to nth baseband processing cards 30b to 30d to transfer data control unit 46 in the second to nth baseband processing cards 30b to 30d. And a margin of data transfer capacity between the channel decoding unit 50 and the channel decoding unit 50 are determined. When the MPU 32 of the first baseband processing card 30a determines that the total amount of transfer data RXdata exceeds a predetermined threshold, the UE being received and processed by the first baseband processing card 30a Is received by any of the second to nth baseband processing cards 30b to 30d having a sufficient data transfer capacity. On the other hand, when the sum total of the data amount of the transfer data RXdata is equal to or less than the predetermined threshold (No in Step S32), the MPU 32 continues the reception process of the UE by the first baseband processing card 30a, and from the transfer data control unit 46 The received data of the UE is transferred to the channel decoding unit 50 with a 16-bit width. In the above description, the UE reception process has been transferred from the first baseband processing card 30a to the second to nth baseband processing cards 30b to 30d. However, the second to nth baseband processing card 30b is described. The same applies to the transfer of reception processing from ˜30d to other baseband processing cards.

  As described above, in the radio base station according to the third embodiment, the number of UEs to be processed in each of the first to nth baseband processing cards 30a to 30d is transferred by data transfer processing using FIG. This can be maximized under the restriction of the data transfer capacity of the data bus between the unit 46 and the channel decoding unit 50. Furthermore, in each of the first to n-th baseband processing cards 30a to 30d, while performing efficient data transfer according to wireless communication quality, when the total amount of data transfer is likely to exceed the data transfer capacity, The UE reception processing can be transferred between the first to nth baseband processing cards 30a to 30c via the base station resource management card 90.

  In the wireless base station as the first to third embodiments, the case where the data amount of each symbol is reduced from 16 bits to 12 bits has been described as an example, but the value of the data amount of each symbol is set to these values. It is not limited. For example, depending on the error correction function and other decoding processing of the channel decoding unit 50, the value of the data amount of each symbol may be a different value.

  In the radio base station as the first to third embodiments, the case where the W-CDMA scheme is used as a radio access scheme for mobile communication has been described as an example. For example, communication is performed by an OFDM (Orthogonal Frequency Division Multiplexing) system, a CDMA (Code Division Multiple Access) system, a TDMA (Time Division Multiple Access) system, or the like. May be. It is clear that the radio base station of each embodiment is intended to improve the transfer efficiency of received data after detection and does not depend on individual communication methods.

Regarding the above embodiment, the following additional notes are disclosed.
(Appendix 1)
A radio unit that converts a radio signal received from each of a plurality of terminal devices into baseband received data;
A synchronous detector for synchronously detecting the received data;
A communication quality measuring unit that measures the wireless communication quality of the received data;
Transfer of received data transferred from the synchronous detection unit via the signal path so that the total amount of data transferred via the signal path having a fixed data transfer capacity does not exceed the fixed data transfer capacity A data control unit that controls the amount of data based on the wireless communication quality of the received data;
A wireless base station equipped with. (1)
(Appendix 2)
The data control unit reduces the transfer data amount of the received data from the data amount of the received data when the wireless communication quality of the received data is good.
The radio base station according to attachment 1. (2)
(Appendix 3)
The communication quality measuring unit measures a signal-to-interference power ratio of received data.
The radio base station according to appendix 2. (3)
(Appendix 4)
The data control unit determines that the wireless communication quality of the received data is good when the signal-to-interference power ratio of the received data exceeds a predetermined threshold.
The radio base station according to attachment 3. (4)
(Appendix 5)
The data control unit reduces the number of bits for each of a plurality of unit bit strings constituting the reception data when the signal-to-interference power ratio of the reception data exceeds a predetermined threshold.
The radio base station according to appendix 4.
(Appendix 6)
A despreading unit that despreads the baseband received data;
The radio base station according to any one of appendices 1 to 5.
(Appendix 7)
Perform wireless communication with each terminal device by the wideband code division multiple access method.
The radio base station according to any one of appendices 1 to 6.
(Appendix 8)
The data control unit changes the number of terminal devices corresponding to received data transferred through the signal path according to a margin of the data transfer capacity with respect to a total amount of data transferred through the signal path. To
The radio base station according to any one of appendices 1 to 7.
(Appendix 9)
A first processing unit and a second processing unit each including the synchronous detection unit, a communication quality measurement unit, a decoding unit, and a data control unit;
Before the control of the transfer data amount for the first received data in the first processing unit, the total amount of data transferred through the signal path when the control is performed is predicted, and the predicted data amount When the total sum exceeds the predetermined data transfer capacity, the first received data is moved to the second processing unit.
The radio base station according to any one of appendices 1 to 4.
(Appendix 10)
The first processing unit moves the first reception data to the second processing unit by directly communicating with the second processing unit.
The radio base station according to appendix 9.
(Appendix 11)
A management unit that manages processing of the received data in the first processing unit and the second processing unit;
Further comprising
The first processing unit moves the first received data to a second processing unit via a management unit.
The radio base station according to appendix 9.
(Appendix 12)
A radio signal received from each of a plurality of terminal devices is converted into baseband received data,
Synchronous detection of the received data,
Measuring the wireless communication quality of the received data;
The transfer data amount of the received data transferred through the signal path is set so that the total amount of data transferred through the signal path having a fixed data transfer capacity does not exceed the fixed data transfer capacity. Control based on the wireless communication quality of the received data,
A data processing method in a radio base station. (5)
(Appendix 13)
Furthermore, when the wireless communication quality of the received data is good, the transfer data amount of the received data is reduced than the data amount of the received data.
A data processing method in the radio base station according to attachment 12.

20 ... Radio unit 21 ... Band limiting unit 22 ... LNA
23 ... Frequency converter 24 ... A / D converter 25 ... Antenna 30 ... Baseband processing card 31 ... Baseband receiver 32 ... MPU
DESCRIPTION OF SYMBOLS 40 ... RAKE receiving part 41 ... De-spreading process part 42 ... De-spreading code generation part 43 ... Synchronous detection process part 44 ... CH estimation processing part 45 ... SIR measurement part 46 ... Transfer data control part 50 ... Channel decoding part 60 ... Code Generation unit 70 ... Memory 80 ... Delay profile measurement unit 81 ... Matched filter 82 ... Averaging processing unit 83 ... Delay amount / path number detection unit

Claims (7)

A radio unit that converts a radio signal received from each of a plurality of terminal devices into baseband received data;
A first processing unit;
A radio base station having a second processing unit,
The first processing unit and the second processing unit are respectively a synchronous detection unit that synchronously detects the received data;
A communication quality measuring unit that measures the wireless communication quality of the received data;
Transfer of received data transferred from the synchronous detection unit via the signal path so that the total amount of data transferred via the signal path having a fixed data transfer capacity does not exceed the fixed data transfer capacity A data control unit that controls the amount of data based on the wireless communication quality of the received data ,
In the first processing unit, before controlling the transfer data amount for the first received data, the total amount of data transferred through the signal path when the control is performed is predicted, and the predicted data The radio base station according to claim 1, wherein when the sum of the amounts exceeds the certain data transfer capacity, the first processing unit moves the first received data to the second processing unit . The first processing unit moves the first reception data to the second processing unit by directly communicating with the second processing unit.
The radio base station according to claim 1. Each of the first processing unit and the second processing unit further includes a management unit that manages processing of the received data,
The first processing unit moves the first received data to the second processing unit via the management unit.
The radio base station according to claim 1. The data control unit reduces the transfer data amount of the received data from the data amount of the received data when the wireless communication quality of the received data is good.
The radio base station according to any one of claims 1 to 3. The communication quality measuring unit measures a signal-to-interference power ratio of received data.
The radio base station according to claim 1 . The data control unit determines that the wireless communication quality of the received data is good when the signal-to-interference power ratio of the received data exceeds a predetermined threshold.
The radio base station according to claim 5 . The first processing unit
A radio signal received from each of a plurality of terminal devices is converted into baseband received data,
Synchronous detection of the received data,
Measuring the wireless communication quality of the received data;
The transfer data amount of the received data transferred through the signal path is set so that the total amount of data transferred through the signal path having a fixed data transfer capacity does not exceed the fixed data transfer capacity. controlled based on wireless communication quality of the received data,
In the first processing unit, before controlling the transfer data amount for the first received data, the total amount of data transferred through the signal path when the control is performed is predicted, and the predicted data A data processing method in a radio base station , wherein the first received data is moved to a second processing unit when the sum of the amounts exceeds the certain data transfer capacity .