JP2018148412A - Transmission device and delay adjustment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an error when the error occurs in delay adjustment for a signal of one of wireless communication schemes due to the influence of the delay adjustment on a signal of the other wireless communication scheme.SOLUTION: A transmission device includes a multiplexer 130 that transmits a signal obtained by multiplexing a first signal corresponding to a first wireless communication scheme and a second signal corresponding to a second wireless communication scheme by using a common interface, a first baseband unit 111 that outputs the second signal, and a first delay adjustment unit 112 that outputs the second signal different from a transmission timing of a signal transmitted from the multiplexer 130 by a first certain time to the multiplexer 130 delayed from a timing at which the second signal has been received from the first baseband unit 111 by the first delay adjustment time based on the first certain time, in which the transmission timing of the signal transmitted from the multiplexer 130 corresponds to the transmission timing of the first signal transmitted from the multiplexer 130.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a transmission apparatus and a delay adjustment method.

  A radio base station apparatus may use CPRI (Common Public Radio Interface). The CPRI is an organization established for the purpose of defining an open specification of an interface between the radio equipment control (REC) and the radio equipment (RE), for example. Such an interface specification itself may be referred to as CPRI, for example.

  By using the CPRI interface in the radio base station apparatus, for example, it is possible to reduce the size of the apparatus and facilitate maintenance inspection. In addition, since the REC and the RE are connected by an optical cable, it is possible to install the REC and the RE so that the distance between the REC and the RE is about several kilometers, and it is difficult to install a radio base station apparatus such as a mountainous area. An RE can be installed in the area, and the range of services provided to users can be expanded.

  Furthermore, in CPRI, for example, it is possible to first transmit a 3G (3rd Generation) system signal, and then transmit a mixture of LTE (Long Term Evolution) system and 3G system signals. As described above, the CPRI can smoothly change the radio communication system to a different system, such as the 3G system to the LTE system, and can flexibly expand the function of the radio base station apparatus.

  Examples of techniques related to such a radio base station apparatus include the following. That is, based on the transmission delay time between the first REC in the lead BS (Base Station) and the second RE in the subordinate BS and the transmission delay time between the second REC and the second RE in the subordinate BS, the second REC reference There is a radio base station apparatus that corrects the timing of a frame. According to this technique, it is possible to appropriately establish synchronization between radio base stations.

  The REC calculates the delay amount obtained by subtracting the delay amount of the RE in the apparatus and the delay amount of the cable connecting the REC and the RE from a predetermined maximum delay amount, and the OFDM (Orthogonal) is calculated from the data input to the buffer. (Frequency Division Multiplexing) Symbol head is detected. Then, the REC determines the transmission timing of the OFDM symbol so that the transmission timing at the beginning of the detected OFDM symbol becomes a timing delayed by the calculated delay amount from the reference signal of a predetermined period. According to this technique, the delay amount can be accurately absorbed.

JP 2010-206737 A JP 2012-199718 A

  However, both the technique for correcting the timing of the reference frame based on the transmission delay time and the technique for determining the transmission timing of OFDM both transmit signals by mixing two different wireless communication schemes such as LTE and 3G. There is no discussion about that. Therefore, in these two techniques, when an error occurs in the delay adjustment for the signal of the other wireless communication system due to the influence of the delay adjustment for the signal of the one wireless communication system, how to reduce the error. I haven't presented any solution for it.

  Further, in the technique for correcting the timing of the reference frame based on the transmission delay time, the transmission cable from the first REC on the leading BS side and the transmission cable from the second REC on the dependent BS side are compared to the second RE on the dependent BS side. Two transmission cables are installed. Therefore, in this technique, the cost is increased as compared with the case where one transmission cable is installed.

  Therefore, one disclosure discloses a transmission apparatus and a delay that reduce an error when an error occurs in a delay adjustment for a signal of the other wireless communication method due to an influence of the delay adjustment for the signal of the one wireless communication method. It is to provide an adjustment method.

  Another disclosure is to provide a transmission apparatus and a delay adjustment method that prevent an increase in cost.

  According to one disclosure, in the transmission device, the first signal and the second signal are multiplexed by multiplexing a first signal corresponding to the first wireless communication method and a second signal corresponding to the second wireless communication method. A multiplexer that transmits a signal using a common interface, a first baseband unit that outputs the second signal, and a transmission timing of a signal transmitted from the multiplexer are transmitted from the multiplexer. Corresponding to the transmission timing of the first signal, the second signal different from the transmission timing of the signal transmitted from the multiplexer by a first predetermined time from the timing when the second signal is received from the first baseband unit. And a first delay adjustment unit that delays the first delay adjustment time based on the first predetermined time and outputs the delay to the multiplexer.

  According to one disclosure, when an error occurs in the delay adjustment for the signal of the other wireless communication system due to the influence of the delay adjustment for the signal of the one wireless communication system, the error can be reduced. Further, according to one disclosure, it is possible to prevent an increase in cost.

FIG. 1 is a diagram illustrating a configuration example of a wireless communication system. FIG. 2 is a diagram illustrating a configuration example of the delay adjustment unit. FIG. 3 is a diagram illustrating a configuration example of a multiplexer. FIG. 4 is a diagram illustrating a configuration example of the RE. FIG. 5 is a diagram illustrating an example of delay adjustment. FIG. 6 is a diagram illustrating an example of transmission line delay. FIG. 7 is a diagram illustrating an example of delay adjustment. FIG. 8 is a diagram illustrating an example of delay adjustment. FIG. 9 is a diagram illustrating an example of delay adjustment. FIG. 10A to FIG. 10K are diagrams illustrating an example of timing. FIG. 11 is a diagram illustrating an example of delay adjustment. FIG. 12A to FIG. 12K are diagrams illustrating an example of timing. FIG. 13 is a flowchart showing an operation example. FIG. 14 is a diagram illustrating a calculation example of RTT. FIG. 15 is a diagram illustrating a configuration example of a transmission apparatus. FIG. 16 is a diagram illustrating a configuration example of a multiplexer. FIG. 17A to FIG. 17E are diagrams illustrating an example of timing. FIG. 18A to FIG. 18K are diagrams illustrating an example of timing. FIG. 19A to FIG. 19F are diagrams illustrating an example of timing. FIG. 20 is a diagram illustrating a hardware configuration example of the transmission apparatus. FIG. 21A illustrates a configuration example of the transmission apparatus, and FIGS. 21B to 21D illustrate timing examples.

  Hereinafter, modes for carrying out the present invention will be described. The following examples do not limit the disclosed technology. Each embodiment can be combined as appropriate within a range that does not contradict processing contents. In addition, terms and technical contents described in this specification are appropriately used terms and technical contents described in specifications as communication standards such as CPRI Specification V7.0 (2015-10-09). Also good.

[First Embodiment]
<Configuration example of wireless communication system>
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 10 according to the first embodiment. The wireless communication system 10 includes a transmission device 100 and a reception device 200.

  The transmission apparatus 100 is, for example, a radio base station apparatus or a radio communication apparatus that transmits an LTE signal and a 3G signal. The transmission device 100 is connected to a wired network, and can provide various services such as a call service and a web browsing service to the reception device via the wired network. Note that the transmission device 100 can also receive a signal transmitted from the reception device 200.

  The receiving device 200 is, for example, a terminal device or a wireless communication device that receives a radio signal transmitted from the transmitting device 100. The receiving device 200 can receive service from the transmitting device 100 by performing wireless communication with the transmitting device 100 within the service providing range of the transmitting device 100. Note that the receiving device 200 can also transmit a signal to the transmitting device 100.

  For example, the transmission device 100 and the reception device 200 perform wireless communication using the LTE method, exchange signals using the LTE method, perform wireless communication using the 3G method, and exchange signals using the 3G method. The wireless communication system is an example, and the transmission apparatus 100 and the reception apparatus perform wireless communication using the LTE-Advanced system, exchange signals based on the LTE-Advanced system, perform wireless communication using the 5G system, and perform the 5G system. It is also possible to exchange signals by. The transmission device 100 and the reception device 200 can exchange signals according to each wireless communication method using a plurality of wireless communication methods.

<Configuration example of transmission device>
As illustrated in FIG. 1, the transmission device 100 includes a REC (LTE) 110, a REC (3G) 120, a multiplexer 130, an RE 150, and antennas 171 and 172.

  The REC (LTE) 110 generates, for example, an IQ signal (or IQ data, which may be referred to as “IQ signal” hereinafter) corresponding to the LTE system, and outputs the generated IQ signal to the multiplexer 130.

  The REC (LTE) 110 includes a BB (Base Band) unit 111, a delay adjustment unit 112, and a REC control unit 114.

  The BB unit 111 generates a baseband signal corresponding to the LTE scheme, and performs serial / parallel conversion or the like on the generated baseband signal, so that I (In-Phase) signal components orthogonal to each other are generated. And Q (Quadrature-Phase) signal components. The BB unit 111 outputs a signal having the separated signal component to the delay adjustment unit 112. In the following, a signal having a separated I signal component and Q signal component may be referred to as, for example, a baseband signal or an IQ signal, and the baseband signal and the IQ signal may be used without being distinguished from each other. . For example, the BB unit 111 generates an IQ signal according to the control of the REC control unit 114.

  The delay adjustment unit 112 calculates, for example, a delay adjustment value (or delay adjustment time, hereinafter referred to as “delay adjustment value”) (Tx_L) for the LTE IQ signal, and receives the delay adjustment value from the BB unit 111. The IQ signal is delayed by the delay adjustment value (Tx_L) and output to the multiplexer 130. A method for calculating the delay adjustment value (Tx_L) will be described later.

  The REC control unit 114 performs various controls on the BB unit 111 and the delay adjustment unit 112. Further, the REC control unit 114 exchanges various information with the multiplexer 130 by exchanging control signals and the like with the multiplexer 130.

  For example, the REC (3G) 120 generates an IQ signal corresponding to the 3G system, and outputs the generated IQ signal to the multiplexer 130.

  The REC (3G) 120 includes a BB unit 121, a delay adjustment unit 122, and a REC control unit 124.

  The BB unit 121 generates a baseband signal corresponding to the 3G system, and converts the generated baseband signal into an IQ signal corresponding to the 3G system by performing serial / parallel conversion or the like. The BB unit 121 outputs the generated IQ signal to the delay adjustment unit 122.

  Note that the two BB units 111 and 121 can also receive user data such as voice data from other devices via a wired network, for example. In this case, error correction codes are received for the received user data. The IQ signal may be generated by performing a baseband process such as a conversion process.

  For example, the delay adjustment unit 122 calculates a delay adjustment value (Tx_3G) for a 3G IQ signal, delays the IQ signal received from the BB unit 121 by the delay adjustment value (Tx_3G), and outputs the delay signal to the multiplexer 130. . A method of calculating the delay adjustment value (Tx_3G) will be described later.

  The REC control unit 124 performs various controls on the BB unit 121 and the delay adjustment unit 122. The REC control unit 124 exchanges various information with the multiplexer 130 by exchanging control signals and the like with the multiplexer 130.

  The multiplexer 130 multiplexes (or multiplexes) the IQ signal corresponding to the LTE scheme received from the REC (LTE) 110 and the IQ signal corresponding to the 3G scheme received from the REC (3G) 120 and multiplexed. Two signals are sent to the RE 150 using the CPRI interface. The CPRI interface is, for example, a common interface that can use both an IQ signal corresponding to the LTE system and an IQ signal corresponding to the 3G system. In the present embodiment, the CPRI interface is used in a format in which two signals are mixed (multiplexed).

  For example, the multiplexer 130 performs the following processing. That is, the multiplexer 130 embeds (or inserts) two IQ signals in the AxC container block, and generates one basic frame with a predetermined number of AxC container blocks. The time length of one basic frame is one chip time (1 / fc = 1 / 3.84 MHz = 260.42 ns). For example, the multiplexer 130 transmits each basic frame to the RE 150 in synchronization with one chip time.

  One hyper frame is formed by 256 basic frames, and one CPRI frame is formed by 150 hyper frames. Therefore, one CPRI frame includes 256 × 150 = 38400 basic frames. A frame number called BFN (Node B Frame Number) may be attached to each CPRI frame.

  The RE 150 receives the two IQ signals transmitted from the multiplexer 130 using the CPRI interface. For example, the RE 150 extracts an AxC container from each basic frame, and extracts two IQ signals of an IQ signal corresponding to the LTE scheme and an IQ signal corresponding to the 3G scheme from the AxC container.

  The RE 150 performs modulation processing and frequency conversion processing corresponding to the LTE scheme on the IQ signal corresponding to the LTE scheme, and converts the IQ signal into a radio signal compatible with the LTE scheme. The RE 150 outputs a radio signal corresponding to the LTE scheme to the antenna 171.

  Also, the RE 150 performs modulation processing, frequency conversion processing, and the like corresponding to the 3G method on the IQ signal corresponding to the 3G method, and converts the IQ signal into a radio signal corresponding to the 3G method. The RE 150 outputs a radio signal corresponding to the 3G system to the antenna 172. In the transmission apparatus 100, the RE 150 is a transmission unit that transmits signals corresponding to two wireless communication systems, for example.

  The antenna 171 transmits an LTE radio signal to the receiving device 200. The antenna 172 transmits a 3G wireless signal to the receiving device 200. In FIG. 1, two examples of the antennas 171 and 172 are shown, but there may be one antenna, or three or more antennas.

  In the receiving apparatus 200, the antenna 201 receives an LTE wireless signal, and the antenna 202 receives a 3G wireless signal. The receiving apparatus 200 can extract user data such as voice data by performing frequency conversion processing and demodulation processing corresponding to the LTE scheme on the LTE radio signal. The receiving apparatus 200 can extract user data by performing frequency conversion processing, demodulation processing, or the like corresponding to the 3G system on the 3G system radio signal. In FIG. 1, two examples of the antennas 201 and 202 are shown, but there may be one or three or more antennas.

  The transmission device 100 can also receive a radio signal transmitted from the reception device 200. In that case, the receiving device 200 and the transmitting device 100 perform the following processing, for example. That is, the receiving device 200 generates a radio signal corresponding to the LTE scheme or 3G scheme by performing modulation processing or frequency conversion processing corresponding to the LTE scheme or 3G scheme on the generated audio data, etc. Transmit to the transmitting device 100. The transmission apparatus 100 receives an LTE wireless signal via the antenna 171 and receives a 3G wireless signal via the antenna 172. The RE 150 performs frequency conversion processing and demodulation processing corresponding to the LTE scheme and 3G scheme on the two radio signals received from the antennas 171 and 172, and generates IQ signals corresponding to the two schemes. Then, the RE 150 transmits an IQ signal to the multiplexer 130 using the CPRI interface. The multiplexer 130 receives an IQ signal using the CPRI interface, and outputs an LTE IQ signal to the REC (LTE) 110 and a 3G IQ signal to the REC (3G) 120, respectively. The delay adjustment units 112 and 122 delay the IQ signal received from the multiplexer 130 by a delay adjustment value (Tx_L, Tx_3G) and output the delayed signals to the BB units 111 and 121, respectively. The BB units 111 and 121 can perform baseband processing on the IQ signal and extract voice data generated by the receiving apparatus 200 and the like.

  As illustrated by the dotted line in FIG. 1, the transmission apparatus 100 may include a REC (LTE) 110, a REC (3G) 120, and a multiplexer 130, and may not include the RE 150 and the antennas 171 and 172. .

  Next, configuration examples of the delay adjustment units 112 and 122, the multiplexer 130, and the RE 150 will be described.

<Configuration example of delay adjustment unit>
FIG. 2 is a diagram illustrating a configuration example of the delay adjustment unit 112 on the LTE side. The delay adjustment unit 112 includes a FIFO (First In First Out) control unit 1121 and a FIFO unit 1122. For example, the FIFO control unit 1121 exchanges control signals and the like with the REC control unit 114 to calculate the delay adjustment value (Tx_L) of the IQ signal for the LTE scheme. The FIFO control unit 1121 outputs the delay adjustment value (Tx_L) to the FIFO unit 1122. Thereby, the FIFO control unit 1121 delays the IQ data output from the BB unit 111 and input to the delay adjustment unit 112 by the delay adjustment value (Tx_L) and outputs the delayed data to the multiplexer 130. The unit 1122 can be controlled.

  The FIFO unit 1122 includes a transmission FIFO 1122-1 and a reception FIFO 1122-2. The transmission FIFO 1122-1 and the reception FIFO 1122-2 include, for example, a memory that can be written and read in a FIFO format.

  When receiving the IQ data output from the BB unit 111, the transmission FIFO 1122-1 stores it in the memory for the time of the delay adjustment value (Tx_L), and stores the stored IQ when the time of the delay adjustment value (Tx_L) elapses. Data is read from the memory and output to the multiplexer 130.

  On the other hand, when receiving the IQ data output from the multiplexer 130, the reception FIFO 1122-2 stores it in the memory for the time of the delay adjustment value (Tx_L), and stores it when the time of the delay adjustment value (Tx_L) elapses. IQ data is read from the memory and output to the BB unit 111.

  FIG. 2 also illustrates a configuration example of the delay adjustment unit 122 on the 3G side. The delay adjustment unit 122 includes a FIFO control unit 1221 and a FIFO unit 1222, and the FIFO unit 1222 includes a transmission FIFO 1222-1 and a reception FIFO 1222-2.

  For example, the FIFO control unit 1121 exchanges control signals and the like with the REC control unit 124 to calculate the delay adjustment value (Tx_3G). The FIFO control unit 1121 outputs the calculated delay adjustment value (Tx_3G) to the FIFO unit 1222. The transmission FIFO 1222-1 includes, for example, a memory similar to the transmission FIFO 1122-1. The transmission FIFO 1222-1 stores IQ data output from the BB unit 121 in the memory, and after the time of the delay adjustment value (Tx_3G) has elapsed, from the memory IQ data is read and output to the multiplexer 130. The reception FIFO 1222-2 also includes, for example, a memory, stores the IQ data output from the multiplexer 130 in the memory, and reads the IQ data from the memory and outputs it to the BB unit 121 when the delay adjustment value (Tx_3G) has elapsed. To do. The FIFO control unit 1221 outputs the calculated delay adjustment value (Tx_3G) to the FIFO unit 1222 so that such a delay adjustment can be performed in the FIFO unit 1222.

<Configuration example of multiplexer>
FIG. 3 is a diagram illustrating a configuration example of the multiplexer 130. The multiplexer 130 includes a multiplexer control unit 131, an IQ signal multiplexer 132, and a frame (frame) generation unit 134.

  For example, the multiplexer control unit 131 exchanges control signals and the like with the REC control units 114 and 124 and controls the IQ signal multiplexer 132 and the frame generation unit 134.

  The IQ signal multiplexer 132 multiplexes the IQ signal corresponding to the LTE scheme and the IQ signal corresponding to the 3G scheme, and outputs the multiplexed IQ signal to the frame generation unit 134. The IQ signal multiplexer 132 includes FIFOs 1321, 1322, and 1324, and a multiplexer and demultiplexer 1323. The FIFOs 1321, 1322, and 1324 include, for example, a memory.

  The FIFO 1321 stores the IQ signal output from the delay adjustment unit 112 on the LTE side, reads the stored IQ signal as appropriate, and outputs it to the multiplexer / demultiplexer 1323. The FIFO 1322 stores the IQ signal output from the delay adjustment unit 122 on the 3G side, reads the stored IQ signal as appropriate, and outputs the read IQ signal to the multiplexer / demultiplexer 1323.

  The multiplexer / demultiplexer 1323 multiplexes the IQ signal output from the FIFO 1321 and the IQ signal output from the FIFO 1322, and outputs the multiplexed IQ signal to the FIFO 1324.

  The FIFO 1324 stores the IQ signal (multiplexed IQ signal) output from the multiplexer / demultiplexer 1323, reads the stored IQ signal as appropriate, and outputs it to the frame generation unit 134.

  The frame generation unit 134 uses the IQ signal (multiplexed IQ signal) output from the IQ signal multiplexer 132 as a frame defined by the CPRI (for example, a base frame. Hereinafter, the base frame is referred to as a “frame”). The frame with the IQ signal inserted is transmitted to the RE 150. The frame generation unit 134 inserts an IQ signal corresponding to the LTE scheme into the first position in the frame among the multiplexed IQ signals, and places the IQ signal corresponding to the 3G scheme at the second position in the frame. It may be inserted. At this time, the frame generation unit 134 may receive the control signal from the multiplexer control unit 131 and insert the control signal (or control word (Control Word)) at the third position in the frame.

  Note that the multiplexer 130 can also receive a frame transmitted from the RE 150. In this case, the multiplexer 130 performs the following processing, for example. That is, when receiving the base frame, the frame generation unit 134 extracts an IQ signal from the base frame and outputs the extracted IQ signal to the FIFO 1324. The FIFO 1324 stores the IQ signal, appropriately reads the stored IQ signal, and outputs it to the multiplexer / demultiplexer 1323. The multiplexer / demultiplexer 1323 separates (or demultiplexes) the multiplexed IQ signal into an IQ signal corresponding to the LTE scheme and an IQ signal corresponding to the 3G scheme. The multiplexer / demultiplexer 1323 processes the IQ signal inserted at the first position of the frame as an IQ signal corresponding to the LTE system, and the IQ signal inserted at the second position as an IQ signal corresponding to the 3G system. I do. The multiplexer / demultiplexer 1323 outputs an IQ signal corresponding to the LTE scheme to the FIFO 1321 and an IQ signal corresponding to the 3G scheme to the FIFO 1322. The FIFOs 1321 and 1322 store the received IQ signals, read the stored IQ signals as appropriate, and output them to the delay adjustment units 112 and 122, respectively.

<Configuration example of RE>
FIG. 4 is a diagram illustrating a configuration example of the RE 150. The RE 150 includes a CPRI frame 151, an RE control unit 152, an LTE radio processing unit 153, and a 3G radio processing unit 154.

  The CPRI Framer 151 receives the CPRI frame transmitted from the multiplexer 130, and extracts the control signal, the IQ signal corresponding to the LTE system, and the IQ signal corresponding to the 3G system from the received frame, thereby multiplexing the signal. Isolate. For example, the CPRI Framer 151 extracts an IQ signal corresponding to the LTE system from the first position of the received frame, a corresponding IQ signal of the 3G system from the second position, and a control signal from the third position. The CPRI Framer 151 outputs the extracted control signal to the RE control unit 152, the IQ signal corresponding to the LTE scheme to the LTE radio processing unit 153, and the IQ signal corresponding to the 3G scheme to the 3G radio processing unit 154, respectively.

  For example, the RE control unit 152 controls the LTE wireless processing unit 153 and the 3G wireless processing unit 154 based on the control signal.

  The LTE wireless processing unit 153 performs D / A (Digital to Analogue) conversion, frequency conversion processing corresponding to the LTE method, or the like on the IQ signal corresponding to the LTE method, to a wireless signal corresponding to the LTE method. Convert. The LTE radio processing unit 153 outputs a radio signal corresponding to the LTE scheme to the antenna 171.

  The 3G wireless processing unit 154 performs D / A conversion, frequency conversion processing corresponding to the 3G system, and the like on the IQ signal corresponding to the 3G system, and converts the IQ signal into a radio signal compatible with the 3G system. The 3G wireless processing unit 154 outputs a wireless signal corresponding to the 3G method to the antenna 172.

  The RE 150 can also output a frame corresponding to the CPRI to the multiplexer 130. For example, the RE 150 performs the following processing. In other words, the LTE radio processing unit 153 receives a radio signal corresponding to the LTE system from the antenna 171, performs frequency conversion processing, A / D (Analogue to Digital) conversion processing, and the like on the received radio signal to generate an IQ signal. Convert to The 3G wireless processing unit 154 also receives a wireless signal corresponding to the 3G system from the antenna 172, performs frequency conversion processing, A / D conversion processing, and the like on the received wireless signal, and converts the signal into an IQ signal. The CPRI Framer 151 receives the IQ signal received from the LTE radio processing unit 153 in the first position of the base frame, the IQ signal received from the 3G radio processing unit 154 in the second position, and the control signal received from the RE control unit 152 in the first position. Insert each at position 1. Then, the CPRI Framer 151 transmits a frame in which the control signal and the IQ signal corresponding to the LTE scheme and the 3G scheme are inserted to the multiplexer 130.

<Operation example>
Next, an operation example will be described.

<Delay adjustment method>
FIG. 5 is a diagram illustrating an example of a delay adjustment method. FIG. 5 illustrates an example of delay adjustment on the LTE side. Regarding the delay adjustment, a delay regulation value is defined. The delay specified value is, for example, a predetermined time (or target value) required from the output of the BB unit 111 to the output of the antenna 171.

  For example, after the BB unit 111 outputs an IQ signal, a certain amount of time is required until the antenna 171 transmits a radio signal. The transmission device 100 can transmit a radio signal transmitted from the antenna 171 at a certain timing by performing delay adjustment so that the time coincides with the specified delay value.

  FIG. 7 is a diagram illustrating a numerical example of delay adjustment. Although details will be described later, in the example of FIG. 7, the delay regulation value is 500 chips, and the output timing of the IQ signal output from the BB unit 111 is (0, −500 (chip)), so that the antenna 171 ( A signal can be transmitted at the timing of (0, 0).

  When the 3G side delay specified value is also 500 chips, the output of the 3G side antenna 172 is adjusted by adjusting the delay so that the IQ signal is output from the BB unit 121 on the 3G side to (0, −500). The timing is also (0, 0), which can be matched with the LTE side.

  That is, by such delay adjustment, for example, IQ signals generated by the plurality of RECs 110 and 120 can be simultaneously transmitted from the RE 150 (or the antennas 171 and 172).

  The delay adjustment is, for example, to match the elapsed time from when the BB units 111 and 121 output IQ signals to the time when wireless signals are transmitted from the antennas 171 and 172 via the transmission line to the delay specified value. It is.

  Returning to FIG. 5, the delay from the BB unit 111 to the antenna 171 includes a REC device delay, a delay adjustment value, a gap (gap), a transmission line delay, and a RE device delay. These may be referred to as delay elements, for example.

  The REC intra-device delay represents, for example, a delay time required for the BB unit 111 to input to the delay adjustment unit 112 after outputting the IQ signal. The intra-REC device delay may be a time (or a fixed value) unique to the REC device, such as REC (LTE) 110 and REC (3G) 120, for example.

  The delay adjustment value is a time adjusted by the delay adjustment unit 112, for example. For example, the delay adjustment unit 112 can adjust the delay adjustment value so that the sum of the delay elements becomes the delay specified value. The delay adjustment is performed by the delay adjustment unit 112, for example.

  “gap” represents, for example, a base frame waiting time. For example, the frame generation unit 134 transmits each base frame including IQ data in units of 1 chip (or in synchronization with 1 chip). In this case, the input timing of IQ data input to the frame generation unit 134 may or may not match the transmission timing transmitted in units of 1 chip. For example, when the frame generation unit 134 first transmits a base frame at the 0th chip and then transmits the next base frame at the 1st chip, IQ data may be input at the 0.4th chip. In this case, the IQ data can be transmitted in the next base frame of the first chip after waiting for 0.6 chips, so that the gap becomes “0.6 (chip)”.

  The transmission line delay represents, for example, a delay time in the transmission line from the frame generation unit 134 to the RE 150. That is, the transmission line delay represents, for example, the time taken for the RE 150 to receive the base frame after the base frame is transmitted from the frame generation unit 134 (or multiplexer). The transmission line delay is, for example, a delay element obtained by measurement by the frame generation unit 134. The measuring method will be described later.

  The RE intra-device delay represents, for example, the time from when the RE 150 receives the base frame transmitted from the frame generation unit 134 until the radio signal is output from the antenna 171. The delay in the RE device is also a time (or a fixed value) unique to the RE 150.

<Measurement example of transmission line delay>
FIG. 6 is a diagram illustrating an example of a transmission path delay measurement method. In FIG. 6, the delay time is expressed by (BFN, chip number). (0, 100) is the “0” th BFN and represents the “100” th chip (or base frame).

  As illustrated in FIG. 6, the frame generation unit 134 transmits (0, 100), that is, the “0” th BFN up to the “100” th base frame (for example, a base frame including a measurement signal). Then, (0, 50), that is, up to the “50” th base frame is received by the “0” th BFN. That is, in a transmission line using CPRI, (0, 100) − (0, 50) = (0, 50), base frames for 50 base frames (chip) exist in the transmission line or RE 150. Thus, a delay of 50 base frames (chip) has occurred. When the return delay time in the RE 150 is “0.3” (chip), the frame generation unit 134 measures (50−0.3) /2=23.5chip as the transmission line delay.

  That is, the frame generation unit 134 measures the BFN and chip number when a base frame is transmitted at a certain timing, and measures the BFN and chip number of the base frame received at that time. Then, the frame generation unit 134 measures the transmission line delay using the following equation (1).

Transmission path delay = ((BFN and chip number at the time of transmission) − (BFN and chip number at the time of reception) − (Folding delay time in RE 150)) / 2 (1)
For example, this equation and the return delay time in the RE 150 are held in an internal memory or the like in the frame generation unit 134. The frame generation unit 134 appropriately reads out and measures the measured BFN and chip number when measuring the transmission line delay. By substituting into the equation, the transmission line delay is measured.

<Example of delay adjustment value calculation>
FIG. 7 is a diagram illustrating numerical examples of delay elements on the LTE side, as in FIG. 5. In the example of FIG. 7, the delay in the REC device is “9.6” (chip), the transmission line delay is “23.5” (chip), and the delay in the RE device is “42.2” (chip). . In this case, the delay adjustment unit 112 calculates a delay adjustment value using the following equation (2).

Delay adjustment value = floor (delay specified value− (delay in REC apparatus + transmission path delay + delay in RE apparatus)) (2)
In Expression (2), floor () represents a floor function, and is a function that returns a numerical value with the decimal point truncated in (). In the example of FIG. 7, delay adjustment value = floor (500− (9.6 + 23.5 ++++ 42.2)) = floor (500−75.3) = floor (424.7) = 424.

  However, when the delay adjustment value is added with the delay adjustment value set to “424”, 9.6 + 424 + 0.7 + 23.5 + 42.2 = 499.3, which is not “500” which is the delay specified value. The difference “0.7” is the gap. That is, the delay adjustment unit 112 can calculate gap using the following equation (3).

gap = specified delay value− (REC internal delay + delay adjustment value + transmission path delay + RE internal delay) (3)
“gap” represents, for example, the decimal point (“0.7” of “424.7”) in () when calculated using the floor function according to Equation (2). The value of the delay adjustment value when gap is included is expressed by the following equation (4).

Delay adjustment value = floor (delay specified value− (REC device delay + gap + transmission path delay + RE device delay)) (4)
When a numerical value is substituted in the example of FIG. 7, delay adjustment value = floor (500− (9.6 + 0.7 + 23.5 + 42.2)) = floor (500−76) = floor (424) = 424.

  The delay adjustment value itself is the same when not including gap (formula (2)) and when including gap (formula (4)), but when gap is included, the numerical value in () is subtracted from the decimal point. Can be a number without a decimal point.

  In the example of FIG. 7, the delay adjustment unit 112 delays the input IQ data by “424” chips, and if the frame generation unit 134 waits for “0.7” chips, the delay regulation value as a whole It is possible to satisfy “500” chip. Therefore, in this case, the transmission device 100 can transmit a signal from the antenna 171 at the timing (0, 0).

  “gap” represents, for example, a time difference (0 ≦ gap <1) between input and output timings in the frame generation unit 134. That is, gap represents, for example, the time difference between the timing at which IQ data is output from the delay adjustment unit 112 and input to the frame generation unit 134, and the timing at which the frame generation unit 134 transmits a frame including the IQ data. ing. The gap is consumed, for example, as the time that the IQ signal stays in a buffer or the like in the frame generation unit 134.

  The example of the basic calculation method for delay adjustment has been described above. Next, an example of a calculation method for delay adjustment when the delay adjustment on the 3G side is included will be described.

<LTE side delay adjustment and 3G side delay adjustment value>
FIG. 8 is a diagram illustrating a calculation example of delay adjustment. As shown in FIG. 8, on the LTE side, the delay regulation value is represented as T0_L, the REC device delay is T1_L, the delay adjustment value is Tx_L, the gap is T2_L, the transmission line delay is T3_L, and the RE device delay is T4_L. Yes. When the expression (2) is rewritten as described above, the expression for calculating the delay adjustment value Tx_L is the following expression (5).

Tx_L = floor (T0_L- (T1_L + T3_L + T4_L)) (5)
For example, the delay adjustment unit 112 performs the following calculation. That is, the delay adjustment unit 112 acquires the transmission line delay T3_L measured by the frame generation unit 134 from the frame generation unit 134 via the multiplexer control unit 131 and the REC control unit 114. The delay adjustment unit 112 appropriately reads the equation (5), the REC device delay T1_L, the RE device delay T4_L, and the delay regulation value T0_L stored in the internal memory, and substitutes each numerical value into the equation (5). Thus, the delay adjustment value Tx_L is obtained.

  In the transmission path by the CPRI between the multiplexer 130 and the RE 150, the transmission timing of the frame transmitted from the multiplexer 130 corresponds to the transmission timing of the frame corresponding to the LTE system transmitted from the multiplexer 130. That is, in FIG. 8, the transmission timing of the frame from the multiplexer 130 to the RE 150 is the timing adjusted by the delay adjustment value Tx_L on the LTE side. For example, since there is only one transmission path between the multiplexer 130 and the RE 150, the transmission timing of the multiplexer 130 is determined at the timing adjusted by the delay adjustment value Tx_L on the LTE side. .

  On the other hand, on the 3G side, for example, the delay adjustment value Tx_3G is calculated in accordance with the transmission timing of the multiplexer 130 adjusted on the LTE side. That is, the delay adjustment on the 3G side is performed in accordance with the delay adjustment determined by the LTE side.

  8, the specified delay value on the 3G side is T0_3G, the device delay in the REC on the 3G side is T1_3G, the delay adjustment value on the 3G side is Tx_3G, the transmission line delay is T3_3G (= T3_L), and the RE device on the 3G side The inner delay is expressed as T4_3G. The delay adjustment unit 122 calculates the delay adjustment value Tx_3G using the following equation (6).

Tx_3G = round (T0_3G- (T1_3G + T3_3G + T4_3G)) (6)
In equation (6), round () is a rounding function. Here, on the LTE side, the delay adjustment value is calculated using the Floor function as shown in Equation (2), and on the 3G side, the round function is used as shown in Equation (6). For the following reasons.

  That is, the LTE side determines the transmission time before the 3G side, and the 3G side adjusts to the transmission time determined on the LTE side. Specifically, when the specified delay time is “500”, the LTE side can be filled with gap calculation (0 <gap ≦ 1) by setting 499 ≦ [total delay] <500. The delay regulation time can be set to “500”. On the other hand, the 3G side is affected by the delay adjustment on the LTE side. By using the round function (−0.5 <error ≦ 0.5) for the specified delay time “500”, it becomes possible to set 499.5 <[total delay] ≦ 500.5. . In this case, if it is desired to satisfy −1 <error ≦ 0, a floor function may be used.

  FIG. 9 is a diagram illustrating numerical examples. Each numerical value is represented by chip. The numerical values on the LTE side are the same as in the example of FIG. When each numerical value is substituted into Expression (6), 3G-side delay adjustment value Tx_3G = round (500− (7.7 + 23.5 + 36.9)) = round (500−68.1) = round (431.9) = 432 is obtained.

  However, in this case, the delay adjustment unit 122 on the 3G side calculates the delay adjustment value with no numerical value on the LTE side. Therefore, if the frame is transmitted from the multiplexer 130 with the delay adjustment value (for example, “432”) calculated by the delay adjustment unit 122, the transmission timing may not coincide with the transmission timing adjusted on the LTE side. If the transmission timing of the frame adjusted with the delay adjustment value calculated on the LTE side does not match the transmission timing of the frame adjusted with the delay adjustment value calculated on the 3G side, an error occurs in the delay adjustment on the 3G side. As a result, the optimum delay adjustment is not performed as a whole.

  FIGS. 10A to 10K are diagrams illustrating examples of IQ data and frame timing. Note that in FIGS. 10A to 10K, square portions represent frames. For example, “# 0” representing the “0” th frame in FIGS. 10A to 10G represents IQ data inserted into the “0” th frame. In addition, FIGS. 10H to 10K represent the frame itself.

  FIGS. 10A to 10D show examples of timings on the LTE side. The IQ data output from the BB unit 111 (for example, FIG. 10A) is delayed by the REC delay adjustment value T1_L and input to the delay adjustment unit 112 (for example, FIG. 10B). IQ data stays for the delay adjustment value Tx_L for a period of time in the delay adjustment unit 112, and then is output and input to the multiplexer 130 (for example, FIG. 10C). The IQ data becomes a base frame and is output from the multiplexer 130 after being delayed by gapTx_L.

  The transmission timing (T1_L + Tx_L + T2_L) of the frame output from the multiplexer 130 is the timing at which the delay adjustment value (Tx_L) is adjusted by the delay adjustment unit 112.

  On the other hand, the delay adjustment unit 122 on the 3G side calculates the delay adjustment value Tx_3G using Equation (6). In the example of FIG. 10G, the transmission of the “0” th frame on the LTE side has already started at the timing when the IQ data inserted in the “0” th frame on the 3G side is input to the multiplexer 130. Has been. Therefore, as shown in FIG. 10H, the “0” frame on the 3G side is transmitted at the transmission timing of the “1” frame on the LTE side. As a result, each frame output from the multiplexer 130 and input to the RE 150 has a timing that does not match between the LTE side and the 3G side (or a frame number that does not match), for example, as shown in FIG. . For example, at the timing when the “1” frame on the LTE side is transmitted, the “0” frame is transmitted on the 3G side.

  Returning to FIG. 9, Tx_3G = round (431.9) = 432 as calculated using Equation (6) for the delay adjustment on the 3G side. The decimal part “0.9” in () represents the gap on the 3G side when the delay adjustment is performed on the 3G side alone, for example. When the gap is subtracted, the delay adjustment value Tx_3G is round (431.9−0.9) = round (431) = 431. In this case, when all delay elements are added, 7.7 + 431 + 0.9 + 23.5 + 36.9 = 500 chips, which matches the delay regulation value “500” chip.

In the first embodiment, the delay adjustment unit 122 calculates the 3G-side delay adjustment value Tx_3G without considering gap, as shown in Expression (6). Therefore, the transmission timing from the multiplexer 130 calculated on the 3G side includes an error corresponding to gap (0 ≦ gap <1 chip) with respect to the transmission timing on the LTE side (a timing that matches the delay regulation value 500 chip as a whole). It is. Further, the delay adjustment unit 122 calculates the delay adjustment value Tx_3G using the round function as shown in Expression (6). Therefore, the transmission timing of the multiplexer 130 calculated on the 3G side includes a rounding error (−0.5 or more and less than 0.5) with respect to the transmission timing on the LTE side. For example, assuming that an error obtained by combining two errors is ΔRE, ΔRE is
−0.5 ≦ ΔRE <1.5 (7)
It becomes.

  For example, as shown in FIG. 9, ΔRE is expressed as the difference between the LTE-side delay in the RE device (LTE) and the 3G-side delay in the RE device (3G). When viewed as a whole, ΔRE is a value obtained by adding each delay element on the 3G side (delay between REC and RE) (= 500. The difference is 1). It can be said that ΔRE is, for example, an error in delay adjustment for a 3G signal caused by the effect of delay adjustment on an LTE signal. In the example of FIG. 9, ΔRE = 500− (7.7 + 432 + 23.5 + 36.9) = 500−500.1 = −0.1.

  As shown in FIG. 10K, the 3G-side delay adjustment unit 122 calculates the delay adjustment value Tx_3G without considering the gap, and further calculates the delay adjustment value by round calculation, so that the 3G output relative to the LTE output is obtained. For example, ΔRE may be ΔRE.

  The influence of such an error on the receiving apparatus 200 will be described below.

  For example, when the wireless signal on the 3G side deviates by 1 chip or more from the wireless signal on the LTE side, the receiving apparatus 200 receives “0” for the 3G side while receiving the “1” -th base frame on the LTE side. The “th base frame is received. In this case, when the receiving apparatus 200 switches from the LTE signal to the 3G signal, the base frame number is shifted, so that the “1” frame is switched to the “0” frame, etc. , Can not make a smooth switch. In addition, in the receiving apparatus 200, the “0” base frame is received on the 3G side with respect to the “1” base frame on the LTE side, and therefore the 3G side signal is more than the LTE side signal. In some cases, it may be grasped as being transmitted from a distant base station apparatus. In this case, if the distance between the receiving apparatus 200 and the base station apparatus exceeds the processing limit range of the receiving apparatus 200, the receiving apparatus 200 may not be able to process the 3G side signal.

  Therefore, the transmission apparatus 100 calculates the delay adjustment value in consideration of the gap on the 3G side. Details will be described in the second embodiment.

  In the first embodiment, transmitting apparatus 100 transmits a frame corresponding to the LTE scheme and a frame corresponding to the 3G scheme through one transmission path. Therefore, the transmission apparatus 100 uses a single transmission path compared to the case where the transmission path of the frame corresponding to the LTE system and the transmission path of the frame corresponding to the 3G system are separated, so that cost reduction is achieved. It becomes possible.

[Second Embodiment]
The configuration example of the wireless communication system 10 and the configuration example of the transmission apparatus 100 in the second embodiment are the same as those in the first embodiment (for example, FIGS. 1 to 4).

  FIG. 11 shows a numerical example in the second embodiment. The same numerical values as those in the first embodiment are used except that the delay adjustment value Tx_3G on the 3G side is different and gapT2_3G on the 3G side is added (for example, FIG. 8).

  Also in the second embodiment, the transmission timing of the IQ signal transmitted from the multiplexer 130 corresponds to the transmission timing of the signal corresponding to the LTE scheme transmitted from the multiplexer 130.

  In the delay adjustment unit 122, a signal corresponding to a 3G system that is different from the transmission timing of the signal transmitted from the multiplexer 130 by a predetermined time (T2_3G) with respect to the timing when the signal is received from the BB unit 121 for a predetermined time (T2_3G ) Based on time (Tx_3G). The delay adjustment unit 122 delays the input timing of IQ data by Tx_3G time and outputs the input IQ data to the multiplexer 130.

  Specifically, the multiplexer 130 measures the time difference T2_3G of the timing output from the multiplexer 130 from the input timing of the IQ data output from the delay adjusting unit 122 on the 3G side and input to the multiplexer 130. The multiplexer 130 outputs the measured time difference T2_3G to the delay adjustment unit 122 on the 3G side.

  This measured time difference T2_3G represents, for example, the timing difference between the input and output on the 3G side in the frame generation unit 134 when the delay adjustment adjusted on the LTE side is taken into consideration. This time difference T2_3G may be referred to as a 3G-side gap in consideration of delay adjustment on the LTE side, for example. For example, the gap on the 3G side considering the LTE side is a gap different from the gap on the 3G side described in the first embodiment (gap on the 3G side when delay adjustment is performed on the 3G side alone). Yes.

  The delay adjustment unit 122 in the second embodiment calculates the delay adjustment value Tx_3G using the following equation (8).

Tx_3G = round (T0_3G- (T1_3G + T2_3G + T3_3G + T4_3G)) (8)
Compared with the equation (6) used when calculating the delay adjustment value Tx_3G in the first embodiment, in the equation (8), the gapT2_3G on the 3G side considering the delay adjustment on the LTE side is added. .

  When the delay adjustment value Tx_3G on the 3G side is calculated with the numerical value shown in FIG. 11 according to the equation (8), Tx_3G = round (500− (7.7 + 0.6 + 23.5 + 36.9)) = round (500−68.7). ) = Round (431.3) = 431. Compared to the case of the first embodiment (Tx — 3G = 432), in the second embodiment, IQ data is transmitted from the delay adjustment unit 122 to the multiplexer 130 earlier by one chip. The IQ data is output from the delay adjustment unit 122 to the multiplexer 130 by one chip earlier, so that it is possible to eliminate the frame shift from the LTE side.

  FIG. 12A to FIG. 12K are diagrams illustrating an example of timing. The positions corresponding to the respective timings are the same as those in FIGS. 10A to 10K described in the first embodiment.

  As shown in FIG. 12G, although the output timing of the delay adjustment unit 122 (= input timing of the multiplexer 130) is Tx_3G, 3G side gapT2_3G considering delay adjustment on the LTE side is included in Tx_3G. Have been added. Therefore, for example, the input timing of the IQ data included in the “0” -th base frame on the 3G side to the multiplexer 130 is earlier than the timing at which the “0” -th base frame on the LTE side is transmitted from the multiplexer 130. ing. Accordingly, as shown in FIG. 12H, the “0” th base frame on the 3G side and the “0” th base frame on the LTE side can be output from the multiplexer 130 at the same timing. ing. In this case, as shown in FIG. 12 (I), the input timing of the frame to the RE 150 is the same timing in the 3G system and the LTE system, but as shown in FIGS. 12 (J) and 12 (K). In addition, an error of ΔRE occurs.

  Returning to FIG. 11, adding all the delay elements on the 3G side results in 7.7 + 431 + 0.6 + 23.5 + 36.9 = 499.7 (= REC-RE delay (3G)). Therefore, on the entire 3G side, a deviation of ΔRE = 500−499.7 = 0.3 chips occurs with respect to the entire LTE side (= delay specified value 500 chips).

In the second embodiment, the REC-RE delay (3G) includes gapT2_3G. Therefore, in the delay between REC and RE (3G), the delay between REC and RE (3G) in the second embodiment is equal to the delay of gapT2_3G (0 ≦ gap <), compared with the case where gapT2_3G is not included. 1) is eliminated, and an error due to round calculation remains. An error (−0.5 or more and less than 0.5) due to this round calculation is ΔRE. That is, the range of values that ΔRE can take is
−0.5 ≦ ΔRE <0.5 (9)
It becomes.

  In the first embodiment, the gap value on the 3G side is described as “0.9”. This gap value is, for example, a gap value when delay adjustment is performed on the 3G side alone. Therefore, the REC-RE delay (3G) including this gap value is 500 chips, and ΔRE = 0.

  On the other hand, in the second embodiment, the gap value on the 3G side is described as “0.6”. As described above, this is a gap value measured when the transmission timing from the multiplexer 130 is matched with the timing adjusted by the delay adjustment on the LTE side, for example. Therefore, if the gap value on the 3G side is set to “0.9”, ΔRE = 0, but by setting “0.6”, the difference “0.3” remains, and this difference becomes ΔRE. It is.

  In the example of FIG. 11, ΔRE = 0.3, whereas in the example of the first embodiment (for example, FIG. 9), ΔRE = 0.1. That is, ΔRE is larger in the second embodiment. However, this is such a value due to possible numerical values, and the range of possible values of ΔRE in the second embodiment is expressed by equation (9). Compared with the equation (7), which is a range of values that ΔRE can take in the case of the form, the error is small.

  As described above, the range that ΔRE can take is reduced in the transmission apparatus 100 according to the equation (8) including the gap T2_3G in consideration of the delay adjustment adjusted on the LTE side. I'm calculating. Then, if 0 ≦ T2_3G <0, which is a range that can be taken by gapT2_3G, is reflected in ΔRE by the equation (8) including gapT2_3G, and ΔRE is reflected, and Equation (7) to Equation (9) It is because it became.

  Therefore, in the second embodiment, when an error occurs in the delay adjustment for the signal of the other wireless communication method due to the influence of the delay adjustment for the signal of the one wireless communication method, the error is reduced. Is possible. Similarly to the first embodiment, the second embodiment is not provided with a plurality of transmission lines, and can be realized by a single transmission line. Therefore, a plurality of transmission lines are provided. It is also possible to reduce costs compared to the case where

<Operation example>
FIG. 13 is a diagram illustrating an operation example in the second embodiment.

  When the transmitting apparatus 100 starts processing (S10), it activates CPRI (S11). For example, the REC control units 114 and 124 start up the BB units 111 and 121, the delay adjustment units 112 and 122, and the multiplexer 130 by reading and executing a program stored in the internal memory, and thereby function of the CPRI interface. Make it executable.

  Next, the transmitting apparatus 100 obtains a delay adjustment value of the RE 150 (S12). For example, the frame generation unit 134 reads the RE device delays T4_L and T4_3G from the internal memory, and further reads the RE return delay.

  Next, the transmitting apparatus 100 measures transmission line delays T3_L and T3_3G (S13). For example, the frame generation unit 134 measures the transmission line delays T3_L and T3_3G by using the method described in <Example of transmission line delay measurement> (for example, FIG. 6) using Expression (1). When T3_L = T3_3G, the frame generation unit 134 may measure either T3_L or T3_3G. For example, the frame generation unit 134 outputs the measured transmission line delays T3_L and T3_3G to the delay adjustment units 112 and 122 via the multiplexer control unit 131 and the REC control unit 114, respectively.

  Next, the transmission device 100 determines the transmission frame position of the transmission path (S14). For example, the frame generation unit 134 determines the transmission frame position by performing the following calculation using the RE apparatus delays T4_L and T4_3G and the transmission path delays T3_L and T3_3G obtained and measured in S12 and S13.

LTE transmission frame position = T3_L + T4_L (10)
3G transmission frame position = T3_3G + T4_3G (11)
For example, the frame generation unit 134 reads the expressions (10) and (11) stored in the internal memory, and obtains the RE apparatus delays T4_L and T4_3G and the transmission line delays T3_L and T3_3G obtained and measured in S12 and S13. Calculation is performed by substituting into Equation (10) and Equation (11). The frame generation unit 134 outputs the determined transmission frame position to the delay adjustment units 112 and 122 via the multiplexer control unit 131 and the REC control unit 114.

  Next, the transmitting apparatus 100 obtains the delay specified values T0_L and T0_3G and the REC apparatus delays T1_L and T1_3G (S15). For example, the delay adjustment unit 112 reads the specified delay value T0_L and the in-REC device delay T1_L stored in the internal memory from the internal memory. In addition, the delay adjustment unit 122 reads, for example, the delay specification value T0_3G and the REC device delay T1_3G stored in the internal memory from the internal memory.

  Next, the transmission device 100 determines processing for the LTE signal or processing for the 3G signal (S16). For example, when the delay adjustment unit 112 receives the IQ signal output from the BB unit 111, the delay adjustment unit 112 performs the process of S17 as a process on the LTE-side signal. For example, when the delay adjustment unit 122 receives the IQ signal output from the BB unit 121, the delay adjustment unit 122 performs the processing of S19 and S20 as processing on the 3G side signal.

  When performing processing on the LTE side signal (“LTE” in S16), the transmission device 100 calculates a delay adjustment value Tx_L (S17). For example, the delay adjustment unit 112 calculates the delay adjustment value Tx_L using Equation (2). Changing the notation of Equation (2) gives the following equation.

Tx_L = floor (T0_L- (T1_L + T3_L + T4_L)) (12)
For example, the delay adjustment unit 112 reads the equation (12) stored in the internal memory, and substitutes the values acquired in S12, S13, and S15 into the equation (12) to perform the calculation, thereby calculating the delay adjustment value Tx_L. Is calculated. Then, the REC (LTE) 110 transmits a frame including IQ data corresponding to LTE from the multiplexer 130 at the timing adjusted by the delay adjustment value Tx_L. In this case, as shown in FIG. 8 and the like, when all the delay elements are added, the LTE side matches the delay specification value T0_L, and it is possible to transmit a frame using the PRI at a timing that matches the delay specification value. .

  Then, the transmission device 100 ends the series of processes (S18).

  On the other hand, when performing processing on the 3G side signal (“3G” in S16), the transmitter 100 measures gapT2_3G in the multiplexer 130 (S19). As described above, for example, the frame generation unit 134 measures gapT2_3G on the 3G side in consideration of delay adjustment on the LTE side. Specifically, for example, the frame generation unit 134 counts the time difference between the input timing of IQ data corresponding to the 3G system (= the output timing of the delay adjustment unit 122) and the transmission timing of a frame including this IQ data. Thus, gapT2_3G is measured. The frame generation unit 134 outputs the measured gapT2_3G to the delay adjustment unit 122 via the multiplexer control unit 131 and the REC control unit 124.

  Next, the transmission device 100 calculates a delay adjustment value Tx_3G on the 3G side (S20). For example, the delay adjustment unit 122 reads the equation (8) stored in the internal memory, and substitutes the values acquired in S12, S13, S16, and S19 into the equation (8), thereby calculating the delay adjustment value Tx_3G. . On the 3G side, IQ data corresponding to the 3G scheme is transmitted from the multiplexer 130 to the RE 150 using the CPRI at the transmission timing subjected to delay adjustment by the delay adjustment unit 122.

  Then, the transmission device 100 ends the series of processes (S18).

  Since the transmission timing of the multiplexer 130 is adjusted by the delay adjustment unit 112 on the LTE side, in the process of FIG. 13, the LTE process (S17) is performed at least once from the 3G process (S19, S20). Will be done first.

[Third Embodiment]
Next, a third embodiment will be described. 3rd Embodiment is an example which measures RTT (Round Trip Time) of a radio area on 3G side using gapT2_3G of 3G side. The RTT measured in this way is used, for example, to estimate an accurate position of a terminal device (hereinafter sometimes referred to as “terminal”) 200.

  FIG. 14 is a diagram illustrating an example of RTT. RTT is expressed by the following equation.

RTT = T_Radio_0 + T_Radio_1 (13)
In Expression (13), T_Radio_0 is, for example, the time taken for the antenna 202 of the terminal (UE: User Equipment) 200 to receive the radio signal after the radio signal is transmitted from the antenna 172 on the transmission apparatus 100 side. Represent. T_Radio_1 represents, for example, the time taken for the antenna 172 on the transmitting apparatus 100 side to receive the radio signal after the radio signal is transmitted from the antenna 202 of the terminal 200. That is, T_Radio_0 represents, for example, the elapsed time in the forward path (direction from the transmission apparatus 100 to the terminal 200) in the radio section. T_Radio_1 represents, for example, the elapsed time in the return path (in the direction from the terminal 200 to the transmitting apparatus 100) in the radio section. The sum of these two elapsed times is RTT. In other words, RTT represents, for example, the time taken for the transmission apparatus 100 to receive a radio signal corresponding to the radio signal from the reception apparatus 200 after the transmission of the radio signal from the transmission apparatus 100 to the reception apparatus 200.

  Here, for the 3G side, the in-device delay (hereinafter sometimes referred to as “in-device delay forward path”) in the transmission device 100 is T_REC_RE_0, and the in-device delay (hereinafter “in-device delay”). T_REC_RE_1 may be referred to as “return path”. Here, T_REC_REC_0 and T_REC_RE_1 represent the forward and return times of the REC-RE delay (3G) (for example, T_REC_RE in FIG. 11), respectively.

  In addition, a time taken for the BB unit 121 to receive the IQ data from the terminal 200 after the BB unit 121 of the REC (3G) 120 transmits the IQ data to the terminal 200 is a measured value t. Furthermore, in terminal 200, the time taken for transmitting a frame corresponding to the frame from antenna 202 after receiving the frame at antenna 202 is, for example, a delay T_UE in the terminal.

By transforming equation (13), RTT is
RTT = t- (T_REC_RE_0 + T_REC_RE_1 + T_UE) (14)
It becomes.

  As understood from the equation (14), for example, assuming that the intra-terminal delay T_UE is a fixed value, the RTT is calculated from the measured value t if the intra-device delays (T_REC_RE_0 and T_REC_RE_1) of the transmission device 100 in the forward path and the backward path are known. Is possible.

As shown in FIG. 11, REC-RE delay (3G) T_REC_RE is an added value of each delay element. That is,
T_REC_RE = T1_3G + Tx_3G + T2_3G + T3_3G + T4_3G (15)
It becomes. When the in-device delays (T_REC_RE_0 and T_REC_RE_1) of the forward path and the return path are expressed together by, for example, Expression (15), Expression (14) is
RTT = t− (2T_REC_RE + T_UE) (16)
It becomes.

  The measurement of RTT is performed as follows, for example. That is, the measured value t is obtained by the REC control unit 124 measuring the time from when the IQ data is output from the BB unit 121 to when the IQ data is received. Further, the REC control unit 124 receives each delay element calculated by the delay adjustment unit 122 from the delay adjustment unit 122. Then, the REC control unit 124 reads the intra-terminal delay T_UE and Expression (14) (or Expression (16)) stored in the internal memory, and converts the measured value t, the intra-terminal delay T_UE, and each delay element into Expression (14). ) (Or Expression (16)) to obtain RTT.

  As described above, the transmitting apparatus 100 according to the third embodiment calculates the RTT including the gap T2_3G on the 3G side. For example, as apparent from FIG. 11 and the like, since the REC-RE delay (3G) including gapT2_3G is used, compared to the case where the REC-RE delay (3G) is calculated without including gapT2_3G, The error (0 ≦ T2_3G <1) due to gapT2_3G is reduced. Therefore, it is possible to improve the accuracy of RTT compared to the case where gapT2_3G is not included.

[Fourth Embodiment]
Next, a fourth embodiment will be described. The fourth embodiment is an example in which a plurality of REC (3G) 120 is provided in the transmission apparatus 100.

  FIG. 15 is a diagram illustrating a configuration example of the transmission device 100 according to the fourth embodiment. Transmitting apparatus 100 further includes two RECs (3G # 1, 3G # 2) 120-1 and 120-2. The REC 120-1 may be referred to as an operation side, and the REC 120-2 may be referred to as a redundancy side.

  Each REC 120-1 and 120-2 includes a BB unit 121-1, 121-2, a delay adjustment unit 122-1, 122-2, and a REC control unit 124-1, 124-2.

  For example, the multiplexer 130 switches the IQ data output from the delay adjustment unit 122-1 to the IQ data output from the delay adjustment unit 122-2, and transmits a frame including the switched IQ data to the RE 150. Further, for example, the multiplexer 130 switches the IQ data output from the delay adjustment unit 122-2 to the IQ data output from the delay adjustment unit 122-1, and transmits a frame including the switched IQ data to the RE 150. . Further, the multiplexer 130 switches the IQ data included in the frame transmitted from the RE 150 from the delay adjustment unit 122-1 to the delay adjustment unit 122-2, or from the delay adjustment unit 122-2 to the delay adjustment unit 122-1. Can also be output.

  FIG. 16 is a diagram illustrating a configuration example of the multiplexer 130. The multiplexer 130 further includes a T0 detector 1326 and a T1 detector 135.

  For example, the T0 detection unit 1326 calculates the input timing of the IQ data after delay adjustment output from the delay adjustment unit 122-1 and the input timing of the IQ data after delay adjustment output from the delay adjustment unit 122-2. Detect time difference. This time difference may be referred to as “delay difference T2_3G # 2_ # 1”, for example. For example, the delay difference T2_3G # 2_ # 1 is output from the delay adjustment unit 122-1 on the operation side and input to the multiplexer 130, and output from the delay adjustment unit 122-2 on the redundancy side to the multiplexer 140. It represents the time difference between input IQ data. The T0 detection unit 1326 outputs the detected delay difference T2_3G # 2_ # 1 to the multiplexer control unit 131.

  For example, the T1 detection unit 135 detects a time difference between the output timings of the IQ data after delay adjustment input from the delay adjustment unit 122-1 on the 3G side to the multiplexer 130 and the IQ data transmitted from the multiplexer 130 to the RE. . For example, as described in the second embodiment, this time difference is a gap (gapT2_3G # 1) on the 3G side (REC120-1 side) in consideration of delay adjustment on the LTE side. The T1 detection unit 135 outputs the detected gapT2_3G # 1 to the multiplexer control unit 131.

  The multiplexer control unit 131 functions as a redundant delay detection unit in the fourth embodiment. Hereinafter, the multiplexer control unit 131 may be referred to as a redundant delay detection unit 131. The redundant delay detector 131 calculates the redundant delay ΔT2 using the following equation (17).

ΔT2 = −floor (T2_3G # 1 + T2_3G # 2_ # 1) (17)
For example, the redundancy delay detection unit 131 reads the equation (17) stored in the internal memory, and converts the T2_3G # 1 and T2_3G # 2_ # 1 received from the T0 detection unit 1326 and the T1 detection unit 135, respectively, into the equation (17). The redundancy delay ΔT2 is calculated by substituting for. The redundancy delay detection unit 131 outputs the calculated redundancy delay ΔT2 to the delay adjustment unit 122-2 via the redundancy-side REC control unit 124-2. The delay adjustment unit 122-2 calculates a delay adjustment value based on the redundant delay ΔT2, and outputs the IQ data subjected to the delay adjustment to the multiplexer 130 according to the calculated delay adjustment value.

  FIG. 17A to FIG. 17E are diagrams illustrating an example of timing. These drawings show examples of timings when the redundancy delay ΔT2 is not calculated.

  FIG. 17A shows an example of the output timing of the multiplexer 130. FIG. 17B illustrates an example of input timing of the multiplexer 130 for IQ data output from the REC 120-1 on the operation side. The IQ data is input to the multiplexer 130 with a gap T2_3G # 1 shifted from the output timing of the multiplexer 130.

  On the other hand, FIG. 17C shows an example of the input timing of the IQ data output from the redundant-side REC 120-2 to the multiplexer 130. As described above, the input timings of the two IQ data are shifted by the delay difference T2_3G # 2_ # 1.

  FIG. 17D illustrates an example timing of an LTE frame output from the multiplexer 130, and FIG. 17E illustrates an example timing of a 3G frame. In this case, a case is considered in which switching from the operation-side REC 120-1 to the redundancy-side REC 120-2 is performed at the timing indicated by (x) in FIG. In this case, since a part of the IQ data corresponding to the “# 2” frame on the operation side is input to the multiplexer 130, the switching is performed at the timing (x). Is not entered. On the other hand, the IQ data corresponding to the redundant “# 3” frame is input to the multiplexer 130, and the IQ data that is the head of the “# 3” frame can be output from the multiplexer 130 at different timings. is there. Therefore, when switching from the operation side to the redundancy side is performed at timing (x), the output frame from the multiplexer 130 on the 3G side is “# 3” instead of “# 2” after “# 1”. Become. Therefore, the frame “# 2” is not output from the multiplexer 130, and “chip skip” occurs.

  This is because, for example, the REC 120-2 on the redundant side performs delay adjustment at the timing adjusted for delay on the LTE side without obtaining the delay adjustment value Tx_3G # 1 used in the REC 120-1 on the operation side. is there.

  Therefore, in the fourth embodiment, the redundant delay detector 131 calculates the redundant delay ΔT2 (the value obtained by adding T2_3G # 2_ # 1 and T2_3G # 1 in FIG. 17) using the equation (17), The redundancy-side delay adjustment unit 122-2 performs delay adjustment using the redundancy delay ΔT2.

  FIG. 18A to FIG. 18K are diagrams illustrating an example of timing. As shown in FIG. 18D, the output timing from the multiplexer 130 is adjusted on the LTE side.

  FIG. 18E to FIG. 18G show examples of timing on the operation side. As shown in FIG. 18G, on the operation side, a difference of gapT2_3G # 1 occurs with respect to the output timing from the multiplexer 130.

  On the other hand, FIG. 18 (H) to FIG. 18 (J) show examples of the timing on the redundant side. As shown in FIG. 18J, the redundancy side is shifted by the delay difference T2_3G # 2_ # 1 with respect to the output timing of the delay adjustment unit 122-1 on the operation side (= input timing of the multiplexer 130). The redundant delay ΔT2 obtained by adding the delay difference T2_3G # 2_ # 1 and the operation side gapT2_3G # 1 (FIG. 18G) is added to the delay adjustment value Tx_3G calculated by the delay adjustment unit 122-2. As a result, as shown in FIG. 18J, the output timing of the delay adjustment unit 122-2 is advanced by one chip compared to the case where the redundant delay ΔT2 is not used.

  The reason is as follows, for example. That is, the delay adjustment unit 122-2 calculates the delay adjustment value Tx_3G # 2 using Expression (8). At that time, the delay adjustment unit 122-2 adds the redundant delay ΔT2 to the calculated delay adjustment value Tx_3G # 2, and calculates Expression (8). In equation (8), the number in parentheses is rounded off by round calculation, but by adding the redundant delay ΔT2 to the total adjustment value Tx_3G # 2, it is “± 1” as compared with the case where no addition is made by rounding up or down. "Is likely to be. Therefore, when the redundant delay ΔT2 is added, there is a higher possibility that it is advanced or delayed by one chip as compared to the case where the redundant delay ΔT2 is not added. Thereby, for example, even in the case shown in FIG. 15, it is possible to prevent a chip shift.

  FIG. 19A to FIG. 19F are diagrams illustrating an example of timing. As shown in FIG. 19D, since the redundant delay ΔT2 is added to the delay adjustment value Tx_3G # 2 compared to the case of FIG. 19C, the input timing to the operation side multiplexer 130 is delayed by one chip. . For this reason, even if the operation side is switched to the redundant side at the timing (x), as shown in FIG. 19F, the “# 1” frame is followed by the “# 2” frame. “chip” does not occur.

  Instead of the TO detection unit 1326 and the T1 detection unit 135, the redundant delay detection unit 131 and the FIFOs 1321, 1322, and 1325 may implement the functions of the T0 detection unit 1326 and the T1 detection unit 135.

[Other embodiments]
FIG. 20 is a diagram illustrating a hardware configuration example of the transmission device 100.

  The REC (LTE) 110 further includes a ROM (Read Only Memory) 116, a RAM (Random Access Memory) 117, a CPU (Central Processing Unit) 118, and a memory 119. The CPU 118 can realize the functions of the BB unit 111, the delay adjustment unit 112, and the REC control unit 114 by reading a program stored in the ROM 116, loading it into the RAM 117, and executing the loaded program. The CPU 118 corresponds to, for example, the BB unit 111, the delay adjustment unit 112, and the REC control unit 114. The memory 119 corresponds to, for example, an internal memory.

  The REC (3G) 120 further includes a ROM 126, a RAM 127, a CPU 128, and a memory 129. The CPU 128 can implement the functions of the BB unit 121, the delay adjustment unit 122, and the REC control unit 124 by reading a program stored in the ROM 126, loading it into the RAM 127, and executing the loaded program. The CPU 128 corresponds to, for example, the BB unit 121, the delay adjustment unit 122, and the REC control unit 124. The memory 129 corresponds to, for example, an internal memory.

  The multiplexer 130 further includes a CPU 136, a RAM 137, a ROM 138, a memory 139, and an IF (Interface) 140. The CPU 136 can implement the functions of the multiplexer control unit 131 and the IQ signal multiplexer 132 by reading the program stored in the ROM 138, loading it into the RAM 137, and executing the loaded program. The CPU 136 corresponds to the multiplexer control unit 131 and the IQ signal multiplexer 132, for example. The memory 139 corresponds to, for example, an internal memory. Furthermore, the IF 140 corresponds to the frame generation unit 134, for example.

  The RE 150 further includes an IF 156, a CPU 157, a RAM 158, a ROM 159, and a DSP (Digital Signal Processor) 160. The CPU 157 reads the program stored in the ROM 159, loads it into the RAM 158, and executes the loaded program, thereby realizing the function of the RE control unit 152. The CPU 157 corresponds to the RE control unit 152, for example. The IF 156 corresponds to, for example, the CPRI frame 151. Furthermore, the DSP 160 corresponds to the LTE wireless processing unit 153 and the 3G wireless processing unit 154, for example.

  The CPUs 118, 128, 136, and 157 may be controllers such as an FPGA (Field-Programmable Gate Array) and an MPU (Micro Processing Unit).

  FIG. 21A is a diagram illustrating another configuration example of the transmission device 100. The transmission apparatus 100 includes a first BB unit (baseband unit) 121, a first delay adjustment unit 122, and a multiplexer 130.

  The multiplexer 130 multiplexes the first signal corresponding to the first wireless communication method and the second signal corresponding to the second wireless communication method, and the multiplexed first and second signals are shared. Send using the interface. The transmission timing of the signal transmitted from the multiplexer 130 corresponds to the transmission timing of the first signal transmitted from the multiplexer 130.

  The first BB unit 121 outputs a second signal.

  The first delay adjustment unit 122 performs the following processing on a second signal that is different from the transmission timing of the signal transmitted from the multiplexer 130 by a first predetermined time T2_3G. That is, the first delay adjustment unit 122 delays the first delay adjustment time Tx_3G based on the first predetermined time T2_3G with respect to the timing T1_3G when the second signal is received from the first baseband unit 121. And output to the multiplexer 130.

  In this case, as shown in FIGS. 21B and 21C, the second signal is delayed by the first delay adjustment time Tx_3G based on the first predetermined time T2_3G, and the second delay adjustment is performed. Output from the unit 122. Accordingly, as shown in FIG. 21D, the second signal is transmitted from the first delay adjustment unit 122 to the multiplexer 130 at an earlier timing than before. As a result, the first signal, the frame number, the timing, and the frame number of the second signal match (or the frame timing matches), and the signal can be transmitted from the multiplexer 130. Therefore, when an error occurs in the delay adjustment for the signal of the other wireless communication system due to the influence of the delay adjustment for the signal of the one wireless communication system, the error can be reduced.

  The above is summarized as an appendix.

(Appendix 1)
A first signal corresponding to the first wireless communication method and a second signal corresponding to the second wireless communication method are multiplexed, and the multiplexed first and second signals are shared using a common interface. A multiplexer to transmit
A first baseband unit for outputting the second signal;
The transmission timing of the signal transmitted from the multiplexer corresponds to the transmission timing of the first signal transmitted from the multiplexer, and is different from the transmission timing of the signal transmitted from the multiplexer by a first predetermined time. A first delay adjustment unit that delays a first delay adjustment time based on the first predetermined time with respect to the timing when the second signal is received from the first baseband unit, and outputs the delayed signal to the multiplexer A transmission device comprising:

(Appendix 2)
When the multiplexer transmits the second signal at the transmission timing of the first signal, the multiplexer receives the timing when the second signal is received from the first baseband unit and the second signal. Measure the time difference with the transmission timing to transmit, and output the time difference as the first predetermined time to the first delay adjustment unit,
The transmitting apparatus according to claim 1, wherein the first delay adjustment unit calculates the first delay adjustment time based on the second predetermined time received from the multiplexer.

(Appendix 3)
The first predetermined time is a time difference between the time when the second signal is input to the multiplexer and the time when the second signal is transmitted from the multiplexer at the transmission timing of the first signal. The transmitting apparatus according to appendix 1, characterized by:

(Appendix 4)
Further, the first and second signals output from the multiplexer are received using the common interface, and the multiplexed first and second signals are separated into the first and second signals. And a transmission unit for transmitting the first and second radio signals corresponding to the first and second signals, respectively.
The first delay adjustment unit includes a delay in the REC device until the second signal is input to the first delay adjustment unit after the second signal is output from the first baseband unit, and from the multiplexer. The first predetermined time received, a transmission path delay representing the time taken for the second signal to be transmitted from the multiplexer and received by the transmitter, and the second signal received by the transmitter Then, after the second signal is output from the first baseband unit after the RE in-device delay indicating the time taken to transmit the second radio signal, the second signal is output from the transmitter unit. The transmission apparatus according to appendix 2, wherein the first delay adjustment time is calculated based on a predetermined delay value representing a predetermined time required until a wireless signal is transmitted.

(Appendix 5)
The transmitter measures the transmission line delay based on the first or second signal;
The first delay adjustment unit includes a memory,
The memory stores the delay in the REC device, the delay in the RE device, the prescribed delay value, and Equation (18),
The first delay adjustment unit reads the REC device delay, the RE device delay, the delay specified value, and the equation (18) from the memory, and the equation (18) The first delay adjustment time is calculated by substituting and calculating the delay within the RE device, the specified delay value, the transmission path delay received from the transmitter, and the first predetermined time received from the multiplexer. The transmitting apparatus according to appendix 3, wherein the transmitting apparatus calculates.
First delay adjustment time = round (delay specified value− (delay in REC apparatus + first predetermined time + transmission path delay + delay in RE apparatus)) (18) (where round () is a rounding function. Represent)

(Appendix 6)
Furthermore, a REC (Radio Equipment Control) control unit is provided,
The REC control unit responds to the first radio signal after the transmission device wirelessly transmits a first radio signal corresponding to the second signal to the reception device based on the first predetermined time. The transmitting apparatus according to appendix 1, wherein time required for the transmitting apparatus to receive the second radio signal from the receiving apparatus is calculated.

(Appendix 7)
Furthermore,
A second baseband unit that outputs a third signal corresponding to the second wireless communication method;
A second delay adjustment unit,
The multiplexer adds a time difference between transmission of the second signal using the common interface and transmission of the third signal using the common interface and the first predetermined time. To calculate a redundant delay that represents
The second delay adjustment unit is configured to detect the third signal that is different from the transmission timing of the signal transmitted from the multiplexer by a second predetermined time from the timing when the third signal is received from the second baseband unit. The transmission according to claim 1, wherein the second delay adjustment time based on the second predetermined time and the redundant delay calculated by the multiplexer are added to each other and output to the multiplexer. apparatus.

(Appendix 8)
The multiplexer includes a T0 detector, a T1 detector, and a redundant delay detector,
The T0 detection unit detects a time difference between transmission of the second signal using the common interface and transmission of the third signal using the common interface, and calculates the detected time difference. Output to the redundant delay detector,
The T1 detection unit detects a time from when the second signal is input from the first baseband unit to when the second signal is transmitted using the common interface as the first predetermined time. And outputting the detected first predetermined time to the redundant delay detection unit,
The transmission apparatus according to appendix 7, wherein the redundant delay detection unit calculates the redundant delay by adding the time difference and the first predetermined time.

(Appendix 9)
A first signal corresponding to the first wireless communication method and a second signal corresponding to the second wireless communication method are multiplexed, and the multiplexed first and second signals are shared using a common interface. A first multiplexer and a first baseband unit,
A delay adjustment method in a transmission device including a first delay adjustment unit,
The first baseband unit outputs the second signal,
The transmission timing of the signal transmitted from the multiplexer corresponds to the transmission timing of the first signal transmitted from the multiplexer by the first delay adjustment unit, and the transmission timing of the signal transmitted from the multiplexer The multiplexer delays the second signal different from the first predetermined time by a first delay adjustment time based on the first predetermined time with respect to the timing when the second signal is received from the first baseband unit. Delay adjustment method, characterized by:

10: Radio communication system 100: Transmission device (radio base station device)
110: REC (LTE) 111: BB unit 112: Delay adjustment unit 114: REC control unit 118: CPU 120: REC (3G)
121: BB unit 122: delay adjustment unit 124: REC control unit 130: multiplexer 131: multiplexer control unit (redundancy delay detection unit)
132: IQ signal multiplexer 134: Frame generation unit 135: T1 detection unit 136: CPU
150: RE 171, 172: Antenna 200: Receiving device (terminal device)
1121, 1221: FIFO control unit 1122, 1222: FIFO unit 1122-1, 1222-1: FIFO for transmission
1122-2, 1222-2: Reception FIFO
1321, 1322, 1324: FIFO
1323: Multiplexer and demultiplexer 1326: T0 detector

Claims (5)

A first signal corresponding to the first wireless communication method and a second signal corresponding to the second wireless communication method are multiplexed, and the multiplexed first and second signals are shared using a common interface. A multiplexer to transmit
A first baseband unit for outputting the second signal;
The transmission timing of the signal transmitted from the multiplexer corresponds to the transmission timing of the first signal transmitted from the multiplexer, and is different from the transmission timing of the signal transmitted from the multiplexer by a first predetermined time. A first delay adjustment unit that delays a first delay adjustment time based on the first predetermined time with respect to the timing when the second signal is received from the first baseband unit, and outputs the delayed signal to the multiplexer A transmission device comprising: When the multiplexer transmits the second signal at the transmission timing of the first signal, the multiplexer receives the timing when the second signal is received from the first baseband unit and the second signal. Measure the time difference with the transmission timing to transmit, and output the time difference as the first predetermined time to the first delay adjustment unit,
The transmitting apparatus according to claim 1, wherein the first delay adjustment unit calculates the first delay adjustment time based on the second predetermined time received from the multiplexer. Furthermore, a REC (Radio Equipment Control) control unit is provided,
The REC control unit responds to the first radio signal after the transmission device wirelessly transmits a first radio signal corresponding to the second signal to the reception device based on the first predetermined time. The transmission device according to claim 1, wherein a time required for the transmission device to receive the second radio signal from the reception device is calculated. Furthermore,
A second baseband unit that outputs a third signal corresponding to the second wireless communication method;
A second delay adjustment unit,
The multiplexer adds a time difference between transmission of the second signal using the common interface and transmission of the third signal using the common interface and the first predetermined time. To calculate a redundant delay that represents
The second delay adjustment unit is configured to detect the third signal that is different from the transmission timing of the signal transmitted from the multiplexer by a second predetermined time from the timing when the third signal is received from the second baseband unit. The output of the second delay adjustment time based on the second predetermined time and the redundant delay calculated by the multiplexer is delayed to a time delay. Transmitter device. A first signal corresponding to the first wireless communication method and a second signal corresponding to the second wireless communication method are multiplexed, and the multiplexed first and second signals are shared using a common interface. A first multiplexer and a first baseband unit,
A delay adjustment method in a transmission device including a first delay adjustment unit,
The first baseband unit outputs the second signal,
The transmission timing of the signal transmitted from the multiplexer corresponds to the transmission timing of the first signal transmitted from the multiplexer by the first delay adjustment unit, and the transmission timing of the signal transmitted from the multiplexer The multiplexer delays the second signal different from the first predetermined time by a first delay adjustment time based on the first predetermined time with respect to the timing when the second signal is received from the first baseband unit. Delay adjustment method, characterized by:

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