JP2014096633A - Synchronous window automatic setting method, radio communication system, radio controller, and synchronous window automatic setting program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synchronous window automatic setting method that makes manual setting adjustment work of the synchronous window of a radio controller unnecessary.SOLUTION: A radio communication system transmits and receives signals between a radio controller 101 and a radio device 102 by use of a hyper frame in accordance with a CPRI standard. The radio controller 101 comprises a various function unit 105, automatically starts setting operation of a synchronous window to receive a signal from the radio device 102 when detecting that synchronization of a signal with the radio device 102 is established, and cancels the setting operation of the synchronous window when detecting that the synchronization is out. When the radio controller 101 detected at a predetermined period that a code is set indicating a synchronous word in a control word situated at the head of the first chip of a plurality of chips making up of a hyper frame received from the radio device 102, it determines that synchronization with the radio device 102 is established.

Description

  The present invention relates to a synchronous window automatic setting method, a wireless communication system, a wireless control device, and a synchronous window automatic setting program, and in particular, between a wireless control device (REC: Radio Equipment Control) and a wireless device (RE: Radio Equipment). The present invention relates to a synchronization window automatic setting method for automatically setting a synchronization window of a CPRI (Common Public Radio Interface) interface, a radio communication system, a radio controller, and a synchronization window automatic setting program.

  A communication interface between a radio control device (REC: Radio Equipment Control, hereinafter abbreviated as “REC”) and a radio device (RE: Radio Equipment, abbreviated as “RE” hereinafter) is CPRI. (Common Public Radio Interface) standard. In the CPRI standard, the radio uplink signal from the RE to the REC is transmitted from the hyper frame (CPRI frame) of the hyper frame number “0x0” to the time that causes signal delay in the RE (from the antenna through the RE). A signal pulse indicating the start of the radio frame comes in with a delay by a delay amount until it reaches the REC. On the REC side, the position of the leading signal pulse is monitored and detected.

  Japanese Patent Application Laid-Open No. 2011-130179 “Relay Device” in Japanese Patent Application Laid-Open No. 2011-130179 and Japanese Patent Application Laid-Open No. 2011-130182 “Radio Base Station System and Relay Device” in Japanese Patent Application Laid-Open No. 2011-130179 include an interface between REC-REs based on the CPRI standard A technology related to (I / F: Interface) is disclosed, and signals of both the third generation wireless communication system (3G) and LTE (Long Term Evolution) are relayed together even in the same REC. Technology has been proposed.

JP2011-130179A (page 4-8) JP2011-130182A (Page 5-8)

  As described above, between the head of the CPRI reception frame having the hyper frame number “0x0” (HFN = 0x0) and the radio frame synchronization pulse (MF pulse) transmitted from the outside in a 10 ms cycle for synchronization of the radio frame. Since there is a fixed delay amount according to the circuit configuration on the RE side, the REC side has a CPRI frame composed of 256 chips / hyper frame × 150 hyper frames (= 10 ms). From the inside, it is necessary to find the head of the hyper frame whose hyper frame number is '0x0' (HFN = 0x0).

  For this reason, in the conventional techniques as described in Patent Document 1 and Patent Document 2, first, in a circuit after conversion by a serial-parallel mutual conversion circuit (SerDes: Serializer / Deserializer) on the REC side. , Monitor the CPRI signal after deserialization by the logic analyzer, and manually search for the hyper frame with the hyper frame number '0x0' (HFN = 0x0) and synchronize with the head of the found hyper frame. Search for '0xBC50' (that is, K28.5 (0xBC) /D16.2 (0x50) code) positioned as a word (Sync Word), and from the radio frame synchronization pulse (MF pulse), the synchronization word '0xBC50' (K28. 5 / D16.2 code) is measured.

  Thereafter, the measured fixed delay time is replaced with the number of samples @ MF pulse width (the count value of the number of samples per MF pulse width) and input to the processing unit CPU (Central Processing Unit), thereby setting the synchronization window setting position. To determine whether the synchronization word '0xBC50' (K28.5 / D16.2 code) with a hyper frame number of '0x0' (HFN = 0x0) is entered in the synchronization window. In the end, it was necessary to match the synchronization word '0xBC50' (K28.5 / D16.2 code) to the center position of the fixed width of the synchronization window.

  In addition, when a subtle change occurs in the transmission timing to the REC in accordance with the version change of the circuit on the RE side, the synchronization window manually operated by the above-described manual operation on the REC side every time. The setting position had to be adjusted.

(Object of the present invention)
The present invention has been made in view of such a problem, and automates the setting operation of the REC synchronization window and eliminates the need for manual adjustment operation of the synchronization window, wireless communication system, and wireless control. The object is to provide a device and a synchronization window automatic setting program.

  In order to solve the above-described problems, the synchronous window automatic setting method, the wireless communication system, the wireless control device, and the synchronous window automatic setting program according to the present invention mainly adopt the following characteristic configuration.

  (1) An automatic synchronization window setting method according to the present invention is a wireless communication system in which a signal is transmitted and received between a wireless control device and a wireless device using a hyper frame conforming to a CPRI (Common Public Radio Interface) standard. A synchronization window automatic setting method for automatically setting a synchronization window of the radio control device for receiving a signal from a radio device, wherein the radio control device establishes signal synchronization with the radio device The synchronization window setting operation is automatically started when it is detected, and the synchronization window setting operation is canceled when it is detected that the signal with the wireless device is out of synchronization. It is characterized by that.

  (2) A wireless communication system according to the present invention is a wireless communication system that transmits and receives signals between a wireless control device and a wireless device using a hyper frame that conforms to a CPRI (Common Public Radio Interface) standard. When the control device detects that the synchronization of the signal with the wireless device is established, the control device automatically starts a setting operation of a synchronization window for receiving a signal from the wireless device, and the wireless device The synchronization window setting operation is canceled when it is detected that the signal between the two is out of synchronization.

  (3) A radio network controller according to the present invention is a radio network controller that transmits and receives signals to and from a radio device using a hyper frame that conforms to the Common Public Radio Interface (CPRI) standard. When it is detected that the signal synchronization between the wireless device and the wireless device is established, the synchronization window setting operation for receiving the signal from the wireless device is automatically started. It is characterized in that the setting operation of the synchronization window is canceled when it is detected that it has come off.

  (4) A synchronous window automatic setting program according to the present invention is characterized in that at least the synchronous window automatic setting method described in (1) is implemented as a program executable by a computer.

  According to the synchronous window automatic setting method, wireless communication system, wireless control device, and synchronous window automatic setting program of the present invention, the following effects can be obtained.

  As long as the signal synchronization (CPRI synchronization) between the radio control device (REC) and the radio device (RE) is established, the operation is automatically performed up to the setting of the synchronization window on the REC side. Even if the circuit on the RE side is changed, it is not necessary to manually perform time-related measurement and adjustment of the setting position of the synchronization window.

  That is, '0xBC50 in the hyper frame (HFN = 0x0) located at the head of the hyper frame (CPRI frame) whose hyper frame number is' 0x0' (HFN = 0x0) from the radio frame synchronization pulse (MF pulse). Time measurement until '(control word with K28.5 / D16.2 code)) must be performed manually while being monitored by a logic analyzer at the receiving circuit in the REC by automatically performing Disappears.

  Also, by setting the number of samples @ MF pulse width (count value of the number of samples per MF pulse width) from the time measurement result and automatically setting the position of the synchronization window, the position of the synchronization window is set manually. There is no need.

  Furthermore, it has a synchronization word ('0xBC50' (K28.5 / D16.2 code in the hyper frame of HFN = 0x0)) located at the head of the hyper frame whose hyper frame number is '0x0' (HFN = 0x0). When the control word) is ready to be input to the synchronization window, it is automatically set so that the synchronization word is input at the center position of the fixed width of the synchronization window. Thus, it is not necessary to obtain the upper limit value and the lower limit value of the set position of the synchronization window and manually find the center position from the obtained upper limit value and lower limit value.

It is a system configuration diagram for explaining an example of a system configuration of a wireless communication system in the present invention. FIG. 2 is a frame configuration diagram showing a frame format of a CPRI frame transmitted / received on a CPRI interface between REC and RE of the wireless communication system of FIG. 1. 3 is a table showing a format of a frame control word obtained by extracting control words included in 256 chips constituting each hyper frame of the CPRI frame of FIG. 2. FIG. 2 is a block configuration diagram illustrating an example of an internal configuration of various functional units provided in the REC of the wireless communication system in FIG. 1. 5 is a flowchart for explaining an example of operation in the wireless communication system shown in FIGS. 1 to 4; The time from the radio frame synchronization pulse (MF pulse) to the control word positioned as the synchronization word (Sync Word) at the head of the hyper frame (CPRI frame) with the hyper frame number '0x0' (HFN = 0x0) is measured. It is a time chart for demonstrating an example of the measuring method. Synchronization is performed so that a control word positioned as a synchronization word (Sync Word) at the head of a hyper frame (CPRI frame) having a hyper frame number of “0x0” (HFN = 0x0) is input to the center position of the synchronization window. It is a time chart for demonstrating an example of the method of setting the position of a synchronous window in a window center setting part.

  Preferred embodiments of a synchronization window automatic setting method, a wireless communication system, a wireless control device, and a synchronization window automatic setting program according to the present invention will be described below with reference to the accompanying drawings. In the following description, the automatic synchronization window setting method, radio communication system, and radio control apparatus according to the present invention will be described. However, the automatic synchronization window setting method is implemented as a synchronization window automatic setting program that can be executed by a computer. Needless to say, the synchronization window automatic setting program may be recorded on a computer-readable recording medium.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. The present invention relates to a signal between a radio control device (REC: Radio Equipment Control, hereinafter abbreviated as “REC”) and a radio device (RE: Radio Equipment, abbreviated as “RE” hereinafter). The main feature is that it has a function of automatically executing the synchronization window setting on the REC side when synchronization, that is, CPRI (Common Public Radio Interface) synchronization is established. Even if it changes, it is not necessary to perform manual adjustment each time, and a series of adjustment operations up to the setting of the synchronization window can be performed automatically.

  In other words, a radio frame synchronization pulse (MF pulse (Multi-Frame pulse) or less, which is abbreviated as MF pulse), which is obtained by receiving a REC synchronization pulse transmitted from the outside at a cycle of 10 ms and synchronized with a CPRI frame. And the REC can receive each hyper frame of the CPRI frame to which the hyper frame number (HFN) is assigned in the correct order from the RE. In some cases, when the CPRI synchronization between the REC and the RE changes from the asynchronous state to the synchronous state, it is attached to each hyper frame of the MF pulse and the CPRI frame obtained by reproducing the radio frame synchronization pulse received from the outside. Automatically set the synchronization window based on the hyperframe number (HFN) The main feature is that it is equipped with a function.

  Also, from the radio frame synchronization pulse (MF pulse) transmitted at a period of 10 ms to the position of the synchronization word '0xBC50' (K28.5 / D16.2 code) with the hyper frame number '0x0' (HFN = 0x0) The fixed delay time can be automatically measured by hardware, so that the reception circuit on the REC side does not have to be monitored by a logic analyzer as in the prior art. The fixed delay time can be measured.

  Further, from the measurement result of the fixed delay time, the number of samples @ MF pulse width (the count value of the number of samples per MF pulse width) is calculated, and the synchronization window is automatically set by hardware, so that the CPU ( Even if the input device connected to the Central Processing Unit is manually operated and the setting position of the synchronization window is not manually adjusted, the hyper frame number is “0x0” (HFN = 0x0) in the synchronization window. It is possible to automatically adjust the position of the synchronization window so that the synchronization word '0xBC50' (K28.5 / D16.2 code) can be input.

  Furthermore, when the synchronization window '0xBC50' (K28.5 / D16.2 code) with the hyper frame number '0x0' (HFN = 0x0) can be input in the synchronization window, It is also possible to automatically set the synchronization window so that the synchronization word is positioned at the center position of the fixed width. Thus, the input device connected to the CPU is manually operated, and the parameter is bothered. There is no need to find the upper limit value and lower limit value of the setting position of the synchronization window and find the center position from the obtained upper limit value and lower limit value.

(Embodiment of the present invention)
In the present invention, as described above, the automatic setting operation of the synchronization window becomes effective when the following (1) to (3) are performed.
(1) When CPRI frame synchronization between REC and RE is switched from an asynchronous state to a synchronous state.
(2) The hyper frame number (HFN) is set in the correct order in the CPRI frame from the RE.
(3) The REC can correctly receive a radio frame synchronization pulse (MF pulse) transmitted from the outside as a radio frame synchronization pulse at a cycle of 10 ms.

(Configuration example of embodiment)
Next, a configuration example of the embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a system configuration diagram for explaining an example of a system configuration of a radio communication system according to the present invention.

  As shown in FIG. 1, a radio communication system according to the present invention is abbreviated as a radio control device (REC: Radio Equipment Control, hereinafter abbreviated as “REC”) 101 and a radio device (RE: Radio Equipment, abbreviated as “RE” hereinafter). ) 102, and the REC 101 and the RE 102 are connected using a CPRI interface 103 compliant with the CPRI (Common Public Radio Interface) standard. Here, the physical interface (I / F) of the connection between the REC 101 and the RE 102 may be an optical I / F or an electrical I / F.

  The REC 101 is a serial / parallel conversion unit (SerDes: Serializer / Deserializer, hereinafter referred to as' SerDes unit) that deserializes a CPRI frame transmitted from the RE 102 through the CPRI interface 103 in a high-speed serial signal format into a parallel signal format. 104) (abbreviated as'). Further, various function units 105 described below are connected to the inside of the SerDes unit 104.

  FIG. 2 is a frame configuration diagram showing a frame format of a CPRI frame transmitted / received on the CPRI interface 103 between the REC 101 and the RE 102 of the wireless communication system of FIG. As shown in FIG. 2, each chip 203 of the CPRI frame 201 is composed of a signal of 32 octets (1 / 122.88 MHz per octet) and is transmitted and received at a cycle of 1 / 3.84 MHz. A control word 202 is set in the first two octets. Further, the CPRI frame 201 is composed of a plurality of continuous (150) hyper frames 204, and the hyper frame 204 is composed of 256 chips 203, which is 66.6667 μs (= 256). X (1 / 3.84 MHz)).

  FIG. 3 is a table showing the format of the frame control word extracted from the control word 202 included in each of the 256 chips 203 constituting each hyper frame 204 of the CPRI frame 201 of FIG. Each row of .about.255 shows a control word 202 of 2 octets for each of the 0th chip 203 to the 255th chip 203. Each column of Y = 0 and Y = 1 has a first control word. , Shows a second control word. As shown in FIG. 3, the frame control word 301 made up of the control words 202 of 256 chips 203 indicates that the 0th chip 203 is a sync word 303 K28.5 / The D16.2 code (0xBC50) is set, and the hyper frame number (HFN) 302 is set in the 64th chip 203.

  FIG. 4 is a block diagram showing an example of the internal configuration of the various functional units 105 provided in the REC 101 of the wireless communication system of FIG. 1, and is connected to the inside of the SerDes unit 104 that deserializes the signal from the CPRI interface 103. Various functional units are shown. As shown in FIG. 4, the various function units 105 include a CPRI frame synchronization detection unit 401, an HFN scan unit 402, an HFN abnormality detection unit 403, an HFN = 0x0 detection unit 404, an MF playback unit 405, a synchronization window unit 406, and a synchronization window. It includes at least a setting function unit 407, a time measurement and adjustment unit 408 between MF and 0xBC50 (HFN = 0x0), a 0xBC50 (HFN = 0x0) detection unit 409 within the synchronization window, and a synchronization window center setting unit 410. .

  In the various functional units 105 of FIG. 4, a CPRI frame synchronization detection unit 401 is a functional unit that detects synchronization / asynchronization of the CPRI frame on the receiving circuit side. The HFN scanning unit 402 transmits the hyper frame to the control word 202 of the 64th chip 203 from the frame control word 301 that is an aggregate of the control words 202 of the 256 chips 203 constituting the hyper frame 204. This is a functional unit that scans whether the number 302 exists.

  The HFN abnormality detection unit 403 is a functional unit that detects whether or not the hyper frame number 302 detected by the HFN scanning unit 402 is abnormal. The HFN = 0x0 detection unit 404 is a functional unit that detects a hyper frame whose hyper frame number is “0x0” (HFN = 0x0).

  Also, the MF playback unit 405 plays back a radio frame synchronization pulse transmitted from the outside in a 10 ms cycle as an “H” pulse in a 10 ms cycle synchronized with the CPRI frame, and the reproduced “H” pulse in a radio frame. This is a functional unit that supplies the other functional units inside the REC 101 as a synchronization pulse (MF pulse). The synchronization window unit 406 can determine the start of the radio frame by inputting “0xBC50” (K28.5 / D16.2 code) which is a synchronization word (Sync Word), and performs retiming. It is a functional part that makes it possible. The synchronization window setting function unit 407 is a function for setting the position of the synchronization window so that '0xBC50' (K28.5 / D16.2 code), which is a synchronization word, is input into the synchronization window. Part.

  In addition, the time measurement & adjustment unit 408 between MF and 0xBC50 (K28.5 / D16.2 code) (HFN = 0x0) generates a hyper frame from a radio frame synchronization pulse (MF pulse) supplied from the MF reproduction unit 405. The time until the synchronization word ('0xBC50' (K28.5 / D16.2 code)) of the control word 202 located at the head of the CPRI frame with the number '0x0' (HFN = 0x0) is measured, and the hypertext appears in the synchronization window. -The synchronization window of the control word 202 ('0xBC50' (K28.5 / D16.2 code)) located at the head of the CPRI frame whose frame number is '0x0' (HFN = 0x0) is input. It is a functional unit that adjusts the position.

  In addition, the 0xBC50 (K28.5 / D16.2 code) (HFN = 0x0) detection unit 409 within the synchronization window is positioned at the head of the hyperframe whose hyperframe number is '0x0' (HFN = 0x0) within the synchronization window. This is a functional unit that determines whether or not the synchronization word ('0xBC50' (K28.5 / D16.2 code)) of the control word 202 that is located can be detected. The synchronization window center setting unit 410 has a control word 202 positioned at the beginning of a CPRI frame having a hyper frame number of '0x0' (HFN = 0x0) at the center position of the fixed width of the synchronization window set to a predetermined value. This is a functional unit that adjusts the setting position of the synchronization window so that the synchronization word ('0xBC50' (K28.5 / D16.2 code)) is input.

  By providing various function units 105 having the above functions in the REC 101, the REC 101 receives a radio frame synchronization pulse having a 10 ms period from the outside and synchronizes with a CPRI frame. REC 101 and REC 101 can receive CPRI frames with hyper frame numbers (HFNs) assigned in the correct order from RE 102. When it is detected that the CPRI synchronization with the RE 102 is changed from the asynchronous state to the synchronous state, the synchronization window is determined based on the received MF pulse and the hyper frame number (HFN) attached to the CPRI frame. It becomes possible to carry out the setting automatically.

(Description of operation of embodiment)
Next, an example of the operation of the wireless communication system shown as an example of the embodiment of the present invention in FIGS. 1 to 4 will be described in detail with reference to the flowchart of FIG. FIG. 5 is a flowchart for explaining an example of the operation in the wireless communication system shown in FIGS. 1 to 4, and particularly shows the operation of the various functional units 105 of the REC 101 shown in FIG. . In addition, as shown in the first step S501 of the flowchart of FIG. 5, when synchronization is established with the RE 102, the REC 101 automatically starts a synchronization window setting operation, and synchronization with the RE 102 is established. When it is out of sync and becomes asynchronous, the synchronization window setting operation is canceled and the synchronization window setting operation is waited until synchronization is established.

  First, when a deserialized signal is input from the SerDes unit (104), the CPRI frame synchronization detection unit 401 detects CPRI frame synchronization (step S501). '0xBC50' (K28.5 / D16.2 code) indicating a sync word 303 is added to the control word 202 of the 0th chip 203 of each hyper frame 204 that is repeatedly input at a period of 66.6667 μs. Is set as a synchronous state, and when any other code is set, it is detected as an asynchronous state. When the asynchronous state is reached (in the case of “asynchronous” in step S501), the process returns to step S501, and the synchronization detection operation is repeated without shifting to the synchronization window setting operation until the synchronization state is detected. .

  When the synchronization state is detected (in the case of “synchronization” in step S501), the HFN scanning unit 402 transfers the control word 202 of the 64th chip 203 from the hyper frame 204 in the synchronization state. It is scanned whether or not the hyper frame number (HFN) 302 exists (step S502).

  If the hyper frame number (HFN) 302 does not exist in the control word 202 of the 64th chip 203 (in the case of “absent” in step S502), the process returns to step S501 to change the synchronization state. Repeat the detection operation. On the other hand, if the hyper frame number (HFN) 302 exists (in the case of “exist” in step S502), then the hyper frame number (HFN) existing in the received hyper frame 204 is displayed. ) Are sequentially scanned from 0x0 to 0x95, and the HFN abnormality detection unit 403 checks whether or not there is an abnormality in the hyper frame number (HFN) (step S503).

  The hyper frame number (HFN) is jumped from 0x2 to 0x6 at once, for example, 0x95, 0x0, 0x1, 0x2, 0x6, 0x7, ..., or 0x95 , 0x0, 0x1, 0x2, 0x4, 0x5,..., 0x3 is lost from 0x2 to 0x4 (in the case of “jumping or missing” in step S503), the hyper frame number ( Assuming that an abnormality is detected in HFN), the synchronization window setting process is terminated. On the other hand, if there is no jump or missing in the hyper frame number (HFN) (in the case of “no jump & missing” in step S503), the HFN = 0x0 detecting unit 404 then receives the received hyper frame. A hyper frame whose hyper frame number is '0x0' (HFN = 0x0) is detected from 204 (step S504).

  The 64th chip counted from '0xBC50' (K28.5 / D16.2 code) set as the synchronization word (Sync Word) in the control word 202 of the 0th chip 203 at the head of the hyper frame As described above, the hyper frame number (HFN) is set in the control word 202 of 203. Note that '0xBC50' (K28.5 / D16.2 code) set as the synchronization word (Sync Word) in the control word 202 of the 0th chip 203 at the head of the hyper frame is hyper frame synchronization detection. For the purpose of insertion, each hyper frame is inserted (with a period of 66.6667 μs). In addition, in order not to be confused with the synchronization word “0xBC50” (K28.5 / D16.2 code) of other hyper frame numbers (HFN), the hyper frame number is “0x0” (HFN = 0x0). For the hyper frame, when the synchronization code “0xBC50” (K28.5 / D16.2 code) of the hyper frame (hyper frame number HFN = 0x0) is detected, the HFN = 0x0 detection unit 404 performs one pulse. (10 ms cycle) is generated as a synchronization word detection pulse.

  The HFN = 0x0 detection unit 404 detects the synchronization word “0xBC50” (K28.5 / D16.2 code) of the hyper frame whose hyper frame number is “0x0” (HFN = 0x0), and detects the synchronization word. When a pulse (10 ms cycle) is generated, the MF playback unit 405 then transmits 10 ms (= 150 / hyper) pulses synchronized with the CPRI frame, which are transmitted from outside for 10 ms cycle. Reproduction as an “H” pulse with a period of (frame × 66.667 μs), and outputting the reproduced “H” pulse as a radio frame synchronization pulse (MF pulse) (step S505).

  When a radio frame synchronization pulse (MF pulse) having a period of 10 ms synchronized with the CPRI frame is reproduced, next, a predetermined value is set between the head of the CPRI reception frame and the reproduced radio frame synchronization pulse (MF pulse). Therefore, it is necessary to perform retiming in order to determine the head of the radio frame, and the synchronization window is opened in the synchronization window unit 406 (step S506). That is, the synchronization window unit 406 determines the start of the radio frame by inputting “0xBC50” (K28.5 / D16.2 code) indicating a synchronization word (Sync Word) into the synchronization window. And set to a state where retiming can be performed.

  Further, the synchronization window setting function unit 407 sets the synchronization window position so that '0xBC50' (K28.5 / D16.2 code) indicating the synchronization word (Sync Word) is input into the synchronization window. (Step S507). Note that the width of the synchronization window is a fixed width determined in advance according to the communication mode. When the communication mode of the wireless communication system is 2.4 Gb / s mode, the width of the synchronization window is + 6 / −6 [Samples]. In the case of the 4.9 Gb / s mode, it has a width of + 12 / −12 [Samples].

  For this reason, in the case of the 2.4 Gb / s mode, the synchronization window setting function unit 407 can maintain synchronization between the 2.4 Gb / s mode and the 4.9 Gb / s mode. It is assumed that one set value used for setting the window is one sample, and in the case of the 4.9 Gb / s mode, one set value used for setting the synchronization window is interpreted as two samples. The synchronization window setting function unit 407 sets the time when the number of samples @ MF pulse width (count value of the number of samples per MF pulse width) has elapsed from the radio frame synchronization pulse (MF pulse) as the position of the synchronization window. be able to.

  Thereafter, in the time measurement & adjustment unit 408 between MF and 0xBC50 (K28.5 / D16.2 code) (HFN = 0x0), the hyper frame number is changed from the radio frame synchronization pulse (MF pulse) to “0x0” (HFN = 0x0) Hyperword (CPRI frame) time to control word 202 (ie, control word having '0xBC50' (K28.5 / D16.2 code) indicating Sync Word) Is measured (step S508). Here, the position of the first control word 202 of the hyper frame (CPRI frame) whose hyper frame number is “0x0” (HFN = 0x0) is automatically generated by the HFN = 0x0 detection unit 404 in step S504. Since it can be easily discriminated by the synchronized word detection pulse (10 ms cycle), the time can be automatically and easily measured in step S508.

  Further, in the time measurement & adjustment unit 408 between MF and 0xBC50 (K28.5 / D16.2 code) (HFN = 0x0), the hyper frame number is determined from the measured time (radio frame synchronization pulse (MF pulse)). 0x0 ′ (HFN = 0x0) hyperframe (time until control word 202 located at the beginning of the CPRI frame) is set to the number of samples @ MF pulse width (count value of the number of samples in units of MP pulse width) Conversion is performed to calculate a setting value for setting the synchronization window according to the communication mode, and the setting position of the synchronization window is adjusted.

  In addition, as a specific measurement method of the time in the time measurement & adjustment unit 408 between MF and 0xBC50 (K28.5 / D16.2 code) (HFN = 0x0), for example, as shown in the time chart of FIG. A control word located at the head of a hyper frame (CPRI frame) whose hyper frame number is '0x0' (HFN = 0x0) is activated by the rising edge of the MF pulse 601 and the counter 603 having an MF pulse width of 10 ms period One pulse (10 ms period) generated by the HFN = 0x0 detector 404 at the position of 202 (that is, a control word having “0xBC50” (K28.5 / D16.2 code) indicating a sync word) That is, a synchronization word having a hyper frame number of “0x0” (HFN = 0x0) is detected. It is possible to measure by counting the number of samples X up to the sync word detection pulse 602 indicating.

  FIG. 6 shows a control word 202 (sync word) positioned at the head of a hyper frame (CPRI frame) whose hyper frame number is “0x0” (HFN = 0x0) from the radio frame synchronization pulse (MF pulse). That is, it is a time chart for explaining an example of a measurement method for measuring the time until “0xBC50” (control word having K28.5 / D16.2 code) indicating a sync word.

  Thereafter, the position of the time between MF and '0xBC50' (K28.5 / D16.2 code) (HFN = 0x0) measured by counting the number of samples X by the counter 603 is set at the leading edge of the synchronization window. Adjust to match the position. For example, as shown in FIG. 6, when the wireless communication system is in the 2.4 Gb / s mode, it is used as it is as a setting value 604 (setting value: X) for setting the position of the synchronization window and fixing the synchronization window. The width of the number of samples +6/6 [Samples] is used as the width, and the synchronization window position 605 is set to the position of the control word 202 of the synchronization word '0xBC50' (K28.5 / D16.2 code) (HFN = 0x0). In addition, the setting of the position of the synchronization window is adjusted so that the position on the '+6' side (the most advanced portion) of the synchronization window matches.

  Next, returning to the flowchart of FIG. 5, within the synchronization window whose position is adjusted in step S508 by the 0xBC50 (K28.5 / D16.2 code) (HFN = 0x0) detection unit 409 within the synchronization window, the hyper frame A control word 202 located at the head of a hyper frame (CPRI frame) having a number of “0x0” (HFN = 0x0) (that is, “0xBC50” indicating a sync word (K28.5 / D16.2 code)) ) Is detected (step S509). Within the synchronization window, the synchronization word '0xBC50' (K28.5 / D16.2 code) of the control word 202 located at the head of the hyper frame (CPRI frame) whose hyper frame number is '0x0' (HFN = 0x0) Is not detected (in the case of “not detected” in step S509), the process returns to step S508 as an error, and is positioned at the head of the hyper frame (CPRI frame) with the hyper frame number “0x0” (HFN = 0x0). Until the synchronization word '0xBC50' (K28.5 / D16.2 code) of the control word 202 to be detected is detected, the time measurement & adjustment unit between MF and 0xBC50 (K28.5 / D16.2 code) (HFN = 0x0) The synchronization window setting adjustment operation in 408 is repeated.

  Within the synchronization window, the synchronization word '0xBC50' (K28.5 / D16.2 code) of the control word 202 located at the head of the hyper frame (CPRI frame) whose hyper frame number is '0x0' (HFN = 0x0) Is detected (in the case of “detection” in step S509), the synchronization word “of the control word 202 positioned at the head of the hyper frame (CPRI frame) whose hyper frame number is“ 0x0 ”(HFN = 0x0)”. The synchronization window center setting unit 410 sets the position of the synchronization window so that 0xBC50 ′ (K28.5 / D16.2 code) is input to the synchronization window center position (step S510).

  That is, when the wireless communication system is in 2.4 Gb / s mode, the hyper frame number is “0x0” (HFN = 0x0) at the beginning of the CPRI frame at the center position of the fixed width of + 6 / −6 [Samples]. + 12 / −12 when the synchronization word “0xBC50” (K28.5 / D16.2 code) of the control word 202 located is input, and when the wireless communication system is in the 4.9 Gb / s mode. The synchronization word “0xBC50” (K28.5 / D16.2 code) of the control word 202 located at the beginning of the CPRI frame whose hyper frame number is “0x0” (HFN = 0x0) at the center position of the fixed width of [Samples] Adjust the setting position of the synchronization window so that is input.

  As a specific setting method of the center position of the synchronization window in the synchronization window center setting unit 410, for example, it may be set as shown in the time chart of FIG. FIG. 7 shows that a control word 202 positioned as a synchronization word (Sync Word) at the head of a hyper frame (CPRI frame) having a hyper frame number of “0x0” (HFN = 0x0) is input to the center position of the synchronization window. 6 is a time chart for explaining an example of a method for setting the position of the synchronization window in the synchronization window center setting unit 410, and the center position of the synchronization window when the wireless communication system is in the 2.4 Gb / s mode. An example of the setting method is shown.

  The synchronization window center setting unit 410 is at the center of the fixed width of the synchronization window, that is, at the center of the fixed width of + 6 / −6 [Samples] in the 2.4 Gb / s mode, and in the 4.9 Gb / s mode. , + 12 / −12 [Samples] at the center of the fixed width, the synchronization word “0xBC50” (K28.5 / D16.2) of the control word 202 located at the head of the hyper frame number “0x0” (HFN = 0x0). The center position of the sync window is adjusted so that the code is input. Therefore, as shown in the time chart of FIG. 7, all samples corresponding to the communication mode in the wireless communication system are scanned, and the setting value of the upper limit synchronization window and the setting value of the lower limit synchronization window that deviate from the synchronization window are first calculated. Thus, the center position of the synchronization window to which the synchronization word “0xBC50” (K28.5 / D16.2 code) of the control word 202 is to be input is obtained.

  Also in the time chart of FIG. 7, as described in the time chart of FIG. 6, first, the counter 603 having an MF pulse width of 10 ms cycle is activated by the rising edge of the MF pulse 601, and the hyper frame number is “0x0”. (HFN = 0x0) control word 202 located at the beginning of the hyper frame (CPRI frame) (ie, control word having '0xBC50' (K28.5 / D16.2 code) indicating a sync word) The number of samples X up to 1 pulse (10 ms period), that is, the synchronous word detection pulse 602 generated at the position of is counted.

  Next, when the wireless communication system is in 2.4 Gb / s mode, the counted number of samples X is used as it is as a lower limit set value 701 (set value: X) that is a set value of the lower limit position of the synchronization window, As the fixed width of the synchronization window, using the width of the number of samples +6/6 (Samples), the position of the control word 202 of the synchronization word '0xBC50' (K28.5 / D16.2 code) (HFN = 0x0) The lower limit synchronization window position 702 is set so that the position of the synchronization window on the '+6' side (the most advanced portion) matches. Further, a value (X + 12) obtained by adding the fixed width '12' of the synchronization window in the 2.4 Gb / s mode to the number of samples X (X + 12) is an upper limit set value 703 (set value) that becomes a set value of the upper limit position of the synchronization window. : X + 12) and the position of the control word 202 of the synchronization word '0xBC50' (K28.5 / D16.2 code) (HFN = 0x0) is aligned with the position of the −6 side (end) of the synchronization window. Then, the '+6' side (the most advanced part) of the synchronization window is located at a position '+12' away from the position of the control word 202 of '0xBC50' (K28.5 / D16.2 code) (HFN = 0x0). Thus, the upper limit synchronization window position 704 is set.

  Thereafter, as shown in the time chart of FIG. 7, the arithmetic average {X + (X + 12)} / 2 of the previously obtained lower limit set value 701 and upper limit set value 703 is obtained and set as the center set value 705. The control word 202 of the synchronization word '0xBC50' (K28.5 / D16.2 code) (HFN = 0x0) is adjusted to be input at the center position of the fixed width of the synchronization window. As a result, the position of the arithmetic average {X + (X + 12)} / 2 obtained as the center setting value 705 at the position of the control word 202 of the synchronization word '0xBC50' (K28.5 / D16.2 code) (HFN = 0x0) That is, the position of '0' (center) of the synchronization window matches and the position of the arithmetic average {X + (X + 12)} / 2 obtained as the center setting value 705, in other words, synchronization word '0xBC50' (K28.5 / D16.2). Code) (+6) and (−6) side (front end) and “−6” side (end) at positions of “+6” and “−6” apart from the position of the control word 202 of (code HFN = 0x0) Are set so that each is located.

  By performing the operation as described above, the synchronization window on the REC 101 side is automatically adjusted and set to the most desirable position when it is detected that the signal synchronization between the REC 101 and the RE 102 has been established. Is possible.

  In the above description of the embodiment, the case where the CPRI technique is used has been described. However, the present invention is not limited to such a case. That is, it goes without saying that the present invention can be applied to any wireless communication system composed of any technology as long as it is a system that requires frame synchronization.

(Explanation of effect of embodiment)
As described in detail above, the following effects are obtained in the present embodiment.

  If the CPRI synchronization between the REC 101 and the RE 102 is established, the synchronization window on the REC 101 side is automatically set, so even if the circuit on the RE 102 side is changed, the synchronization is performed manually. There is no need to perform time-related measurements on window settings or to adjust the position of the synchronization window.

  That is, the control word 202 (HFN = 0x0) is positioned as a synchronization word at the head of a hyper frame (CPRI frame) having a hyper frame number of '0x0' (HFN = 0x0) from the radio frame synchronization pulse (MF pulse). Since the time measurement up to '0xBC50' (control word having K28.5 / D16.2 code) in the frame can be automatically performed in hardware, the logic on the receiving side circuit in the REC 101 There is no need to measure manually while monitoring with an analyzer.

  In addition, the number of samples @ MF pulse width (count value of the number of samples per MF pulse width) can be calculated from the time measurement result, and the position of the synchronization window can be automatically set by hardware. There is no need to manually set and adjust the position of the synchronization window by operating an input device connected to the Processing Unit.

  Furthermore, the control word 202 ('0xBC50' (K28.5) in the hyper frame with HFN = 0x0) is positioned as the synchronization word at the head of the hyper frame (CPRI frame) with the hyper frame number '0x0' (HFN = 0x0). /D16.2 code) is automatically set by hardware so that the sync word is input to the center position of the fixed width of the sync window. Therefore, the input device connected to the CPU is manually operated, the parameters are shaken, the upper limit value and the lower limit value of the setting position of the synchronization window are obtained, and the center position is determined from the obtained upper limit value and lower limit value. There is no need to find it manually.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such embodiments are merely examples of the present invention and do not limit the present invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention.

101 Radio control unit (REC)
102 Radio equipment (RE)
103 CPRI Interface 104 Serial / Parallel Mutual Conversion Unit (SerDes Unit)
105 Various Functions 201 CPRI Frame 202 Control Word
203 chips
204 Hyper Frame
301 Frame control word 302 Hyper frame number (HFN)
303 Sync Word
401 CPRI frame synchronization detection unit 402 HFN scanning unit 403 HFN abnormality detection unit 404 HFN = 0x0 detection unit 405 MF reproduction unit 406 synchronization window unit 407 synchronization window setting function unit 408 MF to 0xBC50 (HFN = 0x0) time measurement & adjustment unit 409 Sync window 0xBC50 (HFN = 0x0) detection unit 410 Sync window center setting unit 601 MF pulse 602 Sync word detection pulse 603 Counter 604 Setting value 605 Synchronization window position 701 Lower limit setting value 702 Lower limit synchronization window position 703 Upper limit setting value 704 Upper limit Synchronization window position 705 Center setting value 706 Center synchronization window position

Claims (10)

  The radio control for receiving a signal from the radio device in a radio communication system that transmits and receives signals between the radio controller and the radio device using a hyper frame compliant with the CPRI (Common Public Radio Interface) standard A synchronization window automatic setting method for automatically setting a synchronization window of a device, wherein the wireless control device sets the synchronization window when detecting that synchronization of a signal with the wireless device is established. A method for automatically setting a synchronization window, wherein the operation is automatically started, and the setting operation of the synchronization window is canceled when it is detected that the signal with the wireless device is out of synchronization.   In the wireless control device, a code indicating a synchronization word is set in a control word located at the head of the first chip among a plurality of chips constituting the hyper frame received from the wireless device. 2. The synchronization window automatic setting method according to claim 1, wherein when the detection is performed at a predetermined cycle, the synchronization window setting operation is started on the assumption that synchronization with the wireless device has been established. .   The wireless control device that has started the setting operation of the synchronization window is predetermined in a plurality of chips constituting each of the hyper frames from among the plurality of hyper frames continuously received from the wireless device. When the hyper frame number set in the position is searched and the hyper frame number of each of the plurality of hyper frames received successively is skipped or missing, the hyper frame number is abnormal. In the case where the synchronization window setting operation is finished and the hyper frame number is in a normal state with no skips or omissions, the hyper frame number of “0x0” is set. The synchronous window automatic setting method according to claim 2, wherein an operation of detecting a frame is performed.   The wireless control device that has detected the hyper frame with the hyper frame number “0x0” is set in the control word of the first chip in the hyper frame with the hyper frame number “0x0”. Measure the time between the position of the synchronization word and the radio frame synchronization pulse reproduced at a predetermined period for the frame synchronization of the hyper frame with the radio device, and the measured time, 4. The synchronization window automatic setting method according to claim 3, wherein the synchronization window setting position is adjusted based on the converted number of samples by converting the number of samples counted between the radio frame synchronization pulses. 5. .   To adjust the setting position of the synchronization window when the communication mode of the wireless communication system is 2.4 Gb / s mode when adjusting the setting position of the synchronization window based on the converted number of samples. If the communication mode of the wireless communication system is 4.9 Gb / s mode, 2 samples per unit of setting value for adjusting the setting position of the synchronization window, 5. The synchronization window automatic setting method according to claim 4, wherein a setting position of the synchronization window is adjusted.   The wireless control device that has adjusted the setting position of the synchronization window uses the control word of the first chip in the hyper frame having the hyper frame number “0x0” in the synchronization window in which the setting position has been adjusted. When the set sync word can be detected, the sync word set in the control word of the first chip in the hyper frame whose hyper frame number is '0x0' is the sync window. 6. The synchronization window automatic setting method according to claim 5, wherein the setting position of the synchronization window is set so as to be located at the center position of the synchronization window.   The wireless control device that has adjusted the setting position of the synchronization window uses the control word of the first chip in the hyper frame having the hyper frame number “0x0” in the synchronization window in which the setting position has been adjusted. If the set sync word cannot be detected, the control word of the first chip in the hyper frame with the hyper frame number '0x0' is set in the sync window. 6. The method according to claim 5, wherein the measurement of the time and the adjustment operation of the setting position of the synchronization window based on the conversion result of the measured time to the number of samples are repeated until a synchronization word is detected. Synchronization window automatic setting method.   In a wireless communication system in which a signal is transmitted and received between a wireless control device and a wireless device using a hyper frame conforming to a CPRI (Common Public Radio Interface) standard, the wireless control device is connected to the wireless device. When it is detected that signal synchronization has been established, a synchronization window setting operation for receiving a signal from the wireless device is automatically started, and the signal synchronization with the wireless device is lost. The wireless communication system is characterized in that the setting operation of the synchronization window is canceled when an error is detected.   A radio control apparatus that transmits and receives signals to and from a radio apparatus using a hyper frame that conforms to the CPRI (Common Public Radio Interface) standard, and that signal synchronization with the radio apparatus has been established. When detected, the synchronization window setting operation for receiving a signal from the wireless device is automatically started, and the synchronization is detected when it is detected that the signal with the wireless device is out of synchronization. A wireless control device that cancels a window setting operation.   8. A synchronization window automatic setting program, wherein the synchronization window automatic setting method according to claim 1 is implemented as a program executable by a computer.

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