JP2008228254A - Radio base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a connection rate by performing self-recovery through processing of a call control unit if a fault occurs in a call control system, regarding a radio base station in which the call control unit that performs multi-channel processing, a path detection unit and a despreading unit are packaged on a baseband processing card. <P>SOLUTION: Each of a path detection unit and a despreading unit comprises an auxiliary channel section in addition to a path detection processing section and a despreading processing section corresponding to an active predetermined channel. A call control unit comprises a call control processing section and a fault monitoring section, a resource management control section is provided which is started in response to fault detection by the fault monitoring section and performs processing to expel processing of a fault detected channel to the auxiliary channel section if the auxiliary channel section is in an idle state and when the fault monitoring section receives an acknowledgement from the auxiliary channel section that is a destination to expulsion processing, in response to the expulsion processing, the auxiliary channel number is converted to an original channel number of fault occurrence and answered to a host device. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a radio base station, and more particularly to a radio base station that performs self-restoration control of a call control unit.

  In recent years, it has become essential to provide high-quality services in data communication and voice communication in mobile communication systems. As the number of users increases year by year, improvement of the connection rate and early recovery in the event of a failure have become issues.

  In a radio base station equipped with a multiband radio base station (BTS: Base Transceiver Station) function, the capacity of the accommodated channels (number of users (UE: User Equipment)) is increasing, and accordingly, the call control unit is installed. The number of channels accommodated per baseband card is also increased, such as 16 channels, 64 channels, and 192 channels for each step of increasing the capacity of the baseband card. Along with this, the cost of necessary devices (cards) per channel is also decreasing, and it is expected that products can be manufactured at low cost. However, as the capacity increases, the number of channels processed per card increases, so if a call control system trouble occurs on one channel, many other channels continue to operate normally. Since it is alarmed as a card, it has a large effect on other channels, such as expelling the normal channel to another card, and the call may be disconnected depending on the situation. It will go down. Accordingly, there is a demand for early recovery when a failure occurs, that is, reduction of failure, that is, improvement of reliability as a device.

  FIG. 12 shows a configuration of a conventional example. FIG. 12 shows a block of a baseband demodulator for a multiband radio base station apparatus (represented by MB-BTS) of a WCDMA (Wideband Code Division Multiple Access) system. The configuration is shown. In the figure, 60 is an MPU (Micro Processor Unit) for processing baseband signals of N (N is a number of channels such as 16, 64) × 3 (unit), and 61 is a call for N × 3 (unit) channels. A call control unit 610 that performs control is a call control processing unit that performs processing for N channels provided in the call control unit 61, and three are provided in the call control unit 61. 62 is a path detection unit provided for three units, 620 is a path detection processing unit that performs N channel processing, 63 is a despreading unit provided for three units, and 630 is an N channel despreading processing unit.

  The MPU 60 performs processing such as receiving a call control setting signal from a circuit (not shown) for receiving and processing a radio signal corresponding to the WCDMA system provided at the higher level of the demodulation unit and notifying the call control unit 61. The call control unit 61 transfers and receives channel parameter setting information necessary for the call processing operation of the corresponding channel to the corresponding units of the path detection unit 62 and the despreading unit 63 according to the call control setting signal from the MPU 60. Controls and manages call processing requests such as on and off, and feedback information from each, for example, activation notification (interrupt notification) from the path detection unit and despreading unit when receiving on request, and various measurement reports performed after activation A process of collecting notifications and the like and notifying the MPU 60 is performed.

  In accordance with the call control setting from the MPU 60, the call control unit 61 transfers and receives on / off channel parameter setting information necessary for the call processing operation of the corresponding channel to the corresponding units of the path detection unit 62 and the despreading unit 63 at the subsequent stage. The call processing request such as the above is controlled and managed, feedback information from each block (path detection unit 62, despreading unit 63) is collected, and processing for notifying the MPU 60 is performed. The path detection unit 62 is composed of N channels (64 channels) per unit, and 3 units per card, and receives power from a preceding circuit (not shown) that receives and processes a radio signal corresponding to the WCDMA system. The maximum power position information is detected from the signal converted into information and input. The despreading unit 63 is composed of N channels (64 channels) per unit, and 3 units per card, and performs channel estimation processing and synchronous detection processing based on path information from the path detection unit 62, and is positioned in the subsequent stage. To the decoding unit (not shown).

  FIG. 13 is an example of a flowchart of a conventional call control processing unit. This example shows an example in which a reception on request is performed for an arbitrary M channel. FIG. 14 shows an outline of an operation sequence corresponding to the passage of time when there is an M channel reception request similar to FIG.

  As shown in FIG. 13 and FIG. 14, when a reception ON command (represented by RXON) is notified from an MPU to any M channel (S1 in FIG. 13, a in FIG. 14), the call control unit 61 The M-channel reception ON request and necessary parameters are transferred to the path detection unit 62 and the despreading unit 63 (S2 in FIG. 13, b and c in FIG. 14), and feedback information from each (successfully received transfer) (S3 in FIG. 13, b ′, c ′ in FIG. 14), and when the notification is detected, it is reported to the MPU 60 (busy processing, S4 in FIG. 13, d in FIG. 14).

  After that, when each block actually starts to be activated, its state is also notified (M channel processing circuit activation notification) (S5 in FIG. 13, e, f in FIG. 14), and is reported to the MPU (activation) Interrupt notification, S6 in FIG. 13, g in FIG. The MPU that has notified the call control request sets a monitoring time for a certain period after the request, monitors a report / interrupt notification from the call control unit, and terminates a series of processes upon receiving the notification.

  In the flow shown in FIGS. 13 and 14 of the above-described conventional configuration, there are the following problems, for example.

  (1) The request transfer of the M channel reception on (RXON) from the call control unit 61 to the path detection unit 62 or the despreading unit 63 is not performed successfully.

  (2) The transfer of (1) above has been carried out, but the transfer cannot be correctly received by the path detection unit 62 or the despreading unit 63.

  (3) A case where both (1) and (2) have been performed normally, but that the reception operation has been completed normally (the portion indicated by transfer OK in FIG. 14) cannot be correctly fed back to the call control unit.

  (4) When any of the above (1) to (3) is performed normally, but the call control unit cannot receive correctly.

  As described in (1) to (4) above, if the signal flow is interrupted due to an interface timing failure between blocks or a failure caused by a program bug, the operation of the call control unit It stops in the waiting state of feedback information, and no reporting or notification processing to the MPU is performed.

According to the conventional technology for a CDMA base station apparatus (see Patent Document 1), when a failure is detected in a baseband processing unit in the CDMA base station apparatus, the other baseband processing unit (another baseband card) is transferred. We have proposed a method to copy processing contents, move processing, and continue processing at the destination.
Japanese Patent Application Laid-Open No. 2004-112055

  According to the configuration shown in FIGS. 12 to 14, when a reception ON request is generated for one channel, the MPU enters an alarm state if a response is not returned after the monitoring time determined by starting a timer or the like has elapsed. Even though the status of other channels (63 channels out of 64 channels) in the same card is normal, a device alarm is generated, which directly affects the device quality and becomes an important problem. It was.

  Further, according to the technique of Patent Document 1, when a failure is detected in the baseband processing unit, the alarmed card is handled as a failure, so that the alarmed baseband processing unit cannot be self-recovered. I can't.

  INDUSTRIAL APPLICABILITY According to the present invention, when a failure occurs in a call control system in a demodulation unit of a baseband processing card constituting a multiband radio base station apparatus, a restoration process can be performed by a control process in the call control unit to improve a connection rate. An object is to provide a radio base station.

  FIG. 1 is a diagram showing a first basic configuration of the present invention. In the figure, 1 is a call control unit, 10 is a call control processing unit, 11 is a resource management control unit that performs recovery control when each resource of the path detection unit 2 and despreading unit 3 fails, and 12 is a path generated in call control. A failure monitoring unit that monitors the occurrence of a failure in the detection unit and the despreading unit, 2 is a path detection unit, 20 is a working channel (1 unit N channel) path detection processing unit, 21 is a backup channel unit for path detection, and 3 is reverse Spreading unit, 30 is a working channel (N channel) despreading processing unit, 31 is a backup channel unit for despreading processing, and 4 is an MPU that receives a signal from a radio signal system and processes it to interface with the call control unit 1 It is.

  A feature of the first principle configuration of the present invention is that spare channel sections 21 and 31 are prepared in addition to the current N channel (per unit) in both the path detection section 2 and the despreading section 3. If the spare channel units 21 and 31 are hardware, the number of spare channels may be increased if the gate size is sufficient and the program size is sufficient if firmware is available.

  Also, the call control unit is provided with a failure monitoring unit 12 for monitoring a call control system failure, and when a call control failure is detected, the corresponding channel is switched to a spare channel for processing, and self-recovery after eviction A resource management control unit having a processing function is provided.

  When the MPU 4 makes a request for reception on an arbitrary channel (M channel) and the call control unit 1 receives the request, the failure monitoring unit 12 sends a call setting request and a setting parameter to the path detection unit 2 and the despreading unit 3 in the subsequent stage. Transfers and starts the monitoring timer, monitors whether feedback (response) is returned from each, and performs normal operation when it returns within the monitoring time. If no response is returned from either or both, an error is detected. To the resource management control unit 11. The resource management control unit 11 confirms whether the spare channel unit 21 or 31 in the unit with the corresponding channel of the path detection unit 2 or the despreading unit 3 that has become abnormal is in an empty state. The backup channel unit 21 or 31 is instructed to transfer the call setting information of the failure channel (M channel) (evicting process). If the spare channel unit 21 or 31 is in use, the spare channel unit 21 or 31 of another unit is checked, and the same processing is performed on the unused spare channel unit.

  After the call setting information is transferred to an empty spare channel unit 21 or 31, feedback information from the spare channel unit 21 or 31 (N + 1 channel) of those channel units 21 or 31 (notification confirming that the call has been transferred) Is returned, the resource management control unit 11 reversely converts the (N + 1) channel into the M channel, and instructs the call control unit 1 to report the feedback information to the MPU 4. Also, the failure monitoring unit 12 monitors the presence or absence (detection of feedback within the monitoring time) of the spare channel unit 21 or 31, and if an abnormality is detected, there is a spare channel available in another unit. Check if there is any, and if there is, push it out. When all the spare channel units are full, an alarm is notified from the failure monitoring unit 12 to the MPU 4 that a call control failure has occurred.

  After performing the eviction process to the spare channel unit 21 or 31, the resource management control unit 11 performs a check by a test operation on the failed channel (M channel) and finds that the spare channel unit 21 or 31 has recovered itself. Is instructed to drive back to the original channel (M channel), and the original M channel is continuously operated. If it does not recover itself, it will continue to operate in the backup channel.

  By this first principle configuration, it is possible to continue the operation as much as possible by the backup channel unit without generating a card (device) alarm immediately when an abnormality occurs, and to recover the abnormality, thereby improving the call connection rate as a device. It is possible to improve the device reliability by reducing the alarm occurrence rate.

  Needless to say, the technique of the present invention can be applied not only to the demodulation unit of the baseband processing unit of the multiband radio base station, but also to a system that performs call control processing of many other channels.

  FIG. 2 is a diagram showing a second basic configuration of the present invention. In the figure, 1-4 are the same as each part of the same code | symbol of the said FIG. 1, and abbreviate | omit description. In the call control unit 1, 13 is a call control processing unit, 14 is a resource management control unit that performs the same control as 11 in FIG. 1, but 15 is the same fault monitoring unit and path detection unit as 12 in FIG. 20 in 2 is a path detection processing unit provided for working channels (N channels), and 30 in the despreading unit 3 is a despreading processing unit for working channels (N channels).

  A feature of the second principle configuration of the present invention is that neither a path detector 2 nor a despreader 3 is provided with a spare channel for the current N channel (per unit), and in the event of a failure, the path detector 2 The N channel path detection processing unit 20 and the despreading processing unit 30 in the despreading unit 3 are detected to detect a free channel and perform a switching process.

  When the MPU 4 requests reception on any channel (M channel) and the call control unit 1 receives the request, the failure monitoring unit 15 sends a call setting request and a setting parameter to the path detection unit 2 and the despreading unit 3 in the subsequent stage. The operation of transferring and starting a monitoring timer, monitoring whether a feedback (response) is returned from each of them, and detecting a failure are the same as those in FIG. 1. When an abnormality is detected, the resource management control unit 14 is notified. To do. The resource management control unit 14 is an abnormal path detection unit 2 or despreading unit 3 is an N channel path detection processing unit 20 of the same unit of the path detection unit 2 having the corresponding channel or the same unit of the despreading unit 3 A channel resource (path detection processing unit 20 or despreading processing unit 30) that is in an empty state is detected from the N-channel despreading processing unit 30, and a failure occurrence channel (M channel) is detected for the detected resource. The call management information is transferred and the eviction process is performed, and when feedback information from the eviction destination is returned, the resource management control unit 14 converts the channel from the eviction destination channel back to the M channel and reports it to the MPU. The call control processing unit 13 is instructed to do so.

  As a result, the MPU recognizes that the M channel is operating normally. Also in this case, the failure monitoring unit 15 monitors the eviction destination channel, and when an abnormality is detected in the eviction destination channel, further checks for free resources, and if there is a vacancy, the eviction processing is performed again on that channel. When there is no available space in all resources, the MPU is notified of an alarm that a call control failure has occurred.

  In addition, after executing the eviction process on the free channel resource, if the M channel in which the failure has occurred is checked and it is confirmed that it has been restored normally, it is returned to the recovered M channel resource and continued operation. Let

  As described above, according to the first basic configuration and the second basic configuration, when a call control system abnormality occurs, the operation can be continued as much as possible without immediately generating a call control failure alarm. When the self-recovery is detected, the device is restored to the original state, thereby improving the call connection rate as a device and improving the device reliability by reducing the alarm occurrence rate.

  In addition, according to the first basic configuration, it is possible to perform switching quickly only by providing a spare channel unit of a path detection unit and a despreading unit if the spare channel unit is free when a failure is detected.

  Further, according to the second basic configuration, it is possible to detect a free channel and perform switching by eviction even when a failure is detected, without providing a spare channel unit for the path detection unit and the despreading unit.

  Further, the present invention describes only an example applied to the demodulator of the baseband processing unit for a multiband radio base station apparatus, but the present invention is also applicable to a system that performs call control for many terminals other than the radio base station apparatus. Similar effects can be obtained by applying the same principle to failures of various mechanisms related to control.

  3 to 6 are flowcharts (No. 1) to (No. 4) in the call control unit according to the first embodiment. The first embodiment corresponds to the first basic configuration of the present invention shown in FIG. 1, and is executed by mutual processing of the call control processing unit 10, the resource management control unit 11 and the failure monitoring unit 12 in the call control unit 1. Is done. Further, in both the path detection unit 2 and the despreading unit 3, in addition to the current N channels (per unit), spare channel units 21 and 31 are prepared (N + 1 configuration). Further, in this embodiment, it is assumed that the MPU 4, the call control unit 1, the path detection unit 2, and the despreading unit 3 are mounted on the baseband card for 3 units (each unit is N channels).

  Note that the functions of the call control processing unit 10, the resource management control unit 11, and the failure monitoring unit 12 of the call control unit 1 are the same as those of the CPU, the memory, and the blocks (10 to 12 and adjacent path detection units 2 and 2). Each unit having a configuration such as an interface (not shown) with the spreading unit 3 and the MPU 4) is realized by a program shown in each flowchart of the first embodiment described below.

  When a call setting request (reception on request: indicated by RXON) is sent from the MPU 4 to the M channel (represented by ch) from the MPU 4 (S1 in FIG. 3), the call setting parameter of the Mch is transferred (call From the control unit to the path detection unit and the despreading unit) (S2). As a result, the failure monitoring unit 12 starts a monitoring timer (S3 in FIG. 3). Thereafter, the failure monitoring unit 12 determines whether a transfer receipt notice has been received from the path detection unit 2 or the despreading unit 3 (S4 in FIG. 3), and if it does not come, determines whether the monitoring time has been exceeded (S5). If exceeded, an abnormality detection notification is sent to the resource management control unit 11 (S6), and then the process proceeds to the flow of FIG. When it is identified in S4 in FIG. 3 that the transfer receipt notification has been received, the failure monitoring unit 12 resets the monitoring timer (S7 in FIG. 3). Next, the call control processing unit 10 notifies the MPU 4 that the request has been recognized (request setting busy clear process) (S8 in FIG. 3). Subsequently, the failure monitoring unit 12 starts a timer (S9 in FIG. 3), determines whether an Mch activation notification (interrupt) has been received from the path detection unit 2 or the despreading unit 3 (S10). If it has been exceeded (S11), if it has been exceeded, the resource management control unit 11 is notified of abnormality detection (S12), and then the flow proceeds to the flow of FIG. When the failure monitoring unit 12 identifies that the Mch activation notification has been received in step S10, the failure monitoring unit 12 resets the monitoring timer (S13 in FIG. 3), and the resource management control unit 11 notifies the MPU 4 that the Mch has been activated (interrupt notification). (S14).

  When an abnormality detection notification is sent to the resource management control unit 11 in steps S6 and S12 of FIG. 3, the processing of FIG. 4 is executed, and the resource management control unit 11 checks the spare channel availability, and the same unit (failure occurs) It is determined whether the spare channel of the same unit as the M channel is free (S1 in FIG. 4), and if there is no free, the process proceeds to the processing of FIG. The call control unit 1 is instructed to transfer the parameter to the backup channel in the same unit (S2). As a result, the call control processing unit 10 copies the Mch call setting parameters and transfers them to the backup channels of the path detection unit and the despreading unit in the same unit (S3 in FIG. 4). Thereby, the eviction process is executed.

  Thereafter, the transfer monitoring notification from the backup channel of the path detection unit and the despreading unit is monitored by the monitoring timer activation (S4 in FIG. 4) by the failure monitoring unit 12 (S5), and the monitoring time is exceeded (S6). 5), when the transfer receipt notification comes within the monitoring time, the monitoring timer is reset (S7). Subsequently, the monitoring timer is activated (S8 in FIG. 4), and activation notifications from the standby channels of the path detection unit and the despreading unit are monitored (S9, S10), and the activation notification is not received within the monitoring time. The process proceeds to the process of FIG. When the start notification comes within the monitoring time, the monitoring timer is reset (S11).

  When the activation notification comes within the monitoring time, the failure monitoring unit 12 instructs to convert the standby channel in which the activation notification is generated into an M channel (failure occurrence source channel) as a channel (number) to be notified (activation notification) to the MPU. (S12 in FIG. 4), the MPU is notified of M channel request recognition notification and M channel activation (S13). As a result, when viewed from the MPU, the M channel appears to be operating normally. Subsequently, the recovery processing execution is instructed to the M channel (path detection unit or despreading unit) that is the failure occurrence source (S14 in FIG. 4). Details of the recovery process executed at this time are shown in FIG.

  That is, reception off / reception on is designated from the resource management control unit for the M channel that is a failure occurrence channel (S1 in FIG. 6). On the other hand, the failure monitoring unit 12 determines whether an off / on notification is returned from the path detection unit / despreading unit (S2 in FIG. 6). 11 (S3). If the off / on notification is not returned, the M channel is initialized (internal variables of the corresponding channel area, register information, etc.), and then reception on / off is executed for the M channel from the resource management control unit 11 On the other hand, the failure monitoring unit 12 determines whether or not the on / off notification is returned from the path detection unit / despreading unit (S5). (S3), if not returned, the resource management control unit 11 is notified that the M channel is not self-recovering and cannot be used (S6).

  After instructing the execution of the recovery process in step S14 in FIG. 4, the resource management control unit continues normal operation on the backup channel, and converts to the backup channel upon receiving a call control request from the MPU to the M channel. And the measurement report from the spare channel of the despreading unit is converted to M channel. Then, the failure monitoring unit determines whether the M channel has recovered itself (whether the recovery notification generated in S3 in FIG. 6 has occurred) (S16 in FIG. 4). Then, it instructs the M channel again (S17), transfers the call setting parameters to the original M channel, and continues normal operation (S18). If it is found in step S16 that self-recovery is not performed, the operation is continued on the spare channel and continued until the spare channel (resource) becomes empty.

  If the spare channel of the same unit is not free in step S1 of FIG. 4, the process proceeds to the flowchart of FIG. 5, and the resource management control unit 11 first determines whether there is a spare channel in another unit (see FIG. 5). S1) If the spare channel of another unit is not free, the MPU is notified of the occurrence of a call control failure as an alarm (S2). If there is a vacancy in the spare channel of the other unit, an instruction is given to copy the M channel call setup parameter and transfer it to the spare channel in another unit (S3 in FIG. 5). Transfer to the backup channel (from the call controller to the path detector and despreader) (S4). Thereafter, processing such as monitoring of transfer acceptance and monitoring of activation notification of the path detection unit / despreading unit using the spare channels of the path detection unit / despreading unit of other units is performed in steps S5 to S19 in FIG. Although executed, each processing content is the same as the processing content in S4 to S18 in FIG.

  In the first embodiment, the effect of the demodulator of the baseband processing unit for the multiband radio base station apparatus has been described as an example. However, the first embodiment may be applied to a similar system having a call control process. And similar effects can be expected.

  7 to 12 are flowcharts (No. 1) to (No. 6) of the second embodiment. The second embodiment corresponds to the second basic configuration of the present invention shown in FIG. 2, and is executed by the mutual processing of the call control processing unit 13, the resource management control unit 14 and the failure monitoring unit 15 in the call control unit 1. Is done. Further, in the second embodiment, it is assumed that the MPU 4, the call control unit 1, the path detection unit 2, and the despreading unit 3 are mounted on the baseband card for three units (each unit has N channels).

  The functions of the call control processing unit 13, resource management control unit 14, and fault monitoring unit 15 of the call control unit 1 are the same as those of the CPU, memoria, and each block (13 to 15, adjacent path detection units 2, reverse). Each unit having a configuration such as an interface (not shown) with the spreading unit 3 and the MPU 4) is realized by a program shown in each flowchart of the second embodiment described below.

  First, in FIG. 7, when the call control processing unit 13 sends a call setting request (reception on request: RXON) from the MPU 4 to an arbitrary designated channel (M channel) (S1 in FIG. 7), the above diagram. 3 is performed, the Mch call setting parameters are transferred to the subsequent path detection unit and despreading unit (S2), the monitoring timer is started, and each block (path detection unit and despreading unit) is started. Start monitoring whether or not the feedback receipt notification feedback is returned. If it does not return within the monitoring time, the failure monitoring unit 15 generates an abnormality detection notification to the resource management control unit 14 (S6 in FIG. 7), and proceeds to the processing in FIG. Even if the feedback of the transfer receipt notification is returned, if an M channel activation notification (interrupt) has been monitored, if the monitoring time has not been exceeded, an abnormality detection notification is generated (S12 in FIG. 7), and FIG. Transition to processing. When an activation notification is received within the monitoring time, the operation for notifying the MPU that the M channel has been activated is the same as that of the first embodiment shown in FIG.

  When an abnormality detection notification is output to the resource management control unit in steps S6 and S12 of FIG. 7, the processing of FIG. 8 is executed, and the resource management control unit 14 determines whether there is a free channel in the same unit as the M channel where the failure has occurred. (S1 in FIG. 8), if there is no space, the process proceeds to the processing in FIG. 9. If there is a space, the call control is performed so that the call setting parameters of the M channel where the failure has occurred are transferred to the free channel in the same unit. The processing unit 13 is instructed to hold the allocated channel (S2). As a result, the call control processing unit 10 copies the Mch call setting parameters and transfers them to the empty channels of the path detection unit and the despreading unit in the same unit (S3 in FIG. 8), and the eviction process to the empty channel is executed. .

  Thereafter, the transfer monitoring notification from the empty channel of the same unit of the path detection unit and the despreading unit is monitored by the monitoring timer activation (S4 of FIG. 8) by the failure monitoring unit 15 (S5 of FIG. 8). The processing up to step S15 including S5 is the same as the flowchart from S5 to S15 in FIG. In step S14 in FIG. 8, a restoration process execution instruction is issued for the M channel. Here, as in step S14 in FIG. 4, the self-recovery process shown in FIG. 6 is executed.

  In step S15 of FIG. 8, after continuing normal operation on the eviction destination channel (empty channel in the same unit), it is determined whether there is a call setting request from the MPU to the eviction destination (empty channel in the same unit). (S16 in FIG. 8). This determination is performed in this step because there is a possibility that a call setting request may be specified for a channel to be purged that appears empty when viewed from the MPU 4. If there is no call setup request for this channel, it is determined whether or not self-recovery is performed (S17 in FIG. 8), and if it is not self-recovered, the process returns to step S15 to continue normal operation. When the self-recovery is found, the process that has been expelled to the free channel is instructed to expell (return) to the original M channel from the resource management control unit 14 and transfer the call setting parameters to the original M channel. Normal operation is continued (S19 in FIG. 8). If it is determined in step S16 that there is a call setting request from the MPU to the channel to be evicted, the process proceeds to the process shown in FIG.

  Next, in step S1 in FIG. 8, if it is found that there is no empty channel in the same unit, and if the monitoring time is exceeded in steps S6 and S10 in FIG. Process 9 is executed. In this case, it is determined whether there is an empty channel of another unit (S1 in FIG. 9). If there is no empty channel, the MPU is notified of the occurrence of a call control failure as an alarm (S2). An instruction to transfer the call setting parameters of the M channel to an empty channel of another unit is issued, and the allocated channel is held (S3). Subsequently, the call setting parameters of the M channel are copied and transferred to an empty channel in another unit (from the call control unit to the path detection unit and the despreading unit) (S4 in FIG. 9). Thereafter, the processing in steps S5 to S20 in FIG. 9 is executed for the empty channels in the other units, but the processing contents of these steps are the same as those in steps S4 to S19 (including self-recovery processing) in FIG. The process is performed and the description is omitted. If it is determined in steps S7 and S9 in FIG. 9 that the monitoring time has passed before feedback is received, the process returns to step S1 in FIG. If it is determined in step S17 in FIG. 9 that there is a call setting request from the MPU to the channel to be purged (empty channel of another unit), the process proceeds to the process in FIG.

  FIG. 10 shows the case where it is determined in step S18 of FIG. 8 or step S17 of FIG. 9 that there is a call setting request from the MPU to the channel to be evicted (the empty channel of the same unit or the empty channel of another unit). In this case, the resource management control unit 14 determines whether there is an empty channel in the same unit (S1 in FIG. 10). If there is not, the process proceeds to the processing in FIG. Transfer is instructed to an empty channel in the same unit, and the allocated channel is held (S2 in FIG. 10). In this case, the call that has already been evicted to the evicting destination is evicted to an empty channel in the same unit. Therefore, the call setting parameters of the M channel are copied and transferred to an empty channel in the same unit (S3 in FIG. 10). Thereafter, in steps S4 to S11, monitoring of reception of transfer receipt from the path detection unit / despreading unit and monitoring of reception of activation notification from each unit are performed in the same manner as in steps S4 to S11 of FIG. When it is determined that the notification is normally received in each monitoring operation, the MP channel request recognition notification and the M channel activation notification are masked to the MPU (S12 in FIG. 10). This mask is already reported in the M channel. Thereafter, the process proceeds to step S17 shown in FIG.

  FIG. 11 is executed when it is determined in step S1 of FIG. 10 that there is no other empty channel in the same unit. First, it is determined whether there is an empty channel in another unit (S1 in FIG. 11). If there is no free channel, an MP channel call control failure occurrence is notified to the MPU as an alarm (S2), and a call processing request is sent to the MPU. It is notified that the activated channel could not be activated due to a lack of free resources (S3). If it is determined that there is an empty channel in another unit, the call setting parameter of the eviction destination channel is instructed to be transferred again to the empty channel in the other unit, the allocated channel is held (S4 in FIG. 11), and the M channel call setting is performed. The parameter is copied and transferred to an empty channel of another unit (S5). Thereafter, in the processing from step S6 to S13, monitoring of reception receipt notification to the path detection unit and despreading unit of the empty channel of other units similar to steps S4 to S11 of FIG. 10 and activation from each unit Notification reception is monitored. When it is determined that the notification has been normally received in each monitoring operation, the M channel request recognition notification and the M channel activation notification are masked to the MPU (S14 in FIG. 11). This mask is already reported in the M channel. Thereafter, the process proceeds to the determination in step S18 of FIG.

  In this way, when a failure occurs in the path detection unit or despreading unit of the M channel (arbitrary channel) designated by the MPU, if there is a vacancy, the eviction process is performed again there (re-ejection).

  When all resources (same unit / other units) are full, the MPU is notified of an alarm when a call control failure occurs for the first time.

  After evicting the corresponding channel, the resource management control unit performs reception off / reception on for the M channel, which was the original failure channel, in the same manner as in the first embodiment, and confirms whether the notification is returned correctly (returned) (Recover when you come) If the above does not recover, initialize the internal variables and register information of the corresponding channel area, check whether the notification is returned correctly (recover when it returns), and check whether self-recovery is possible.

  When self-recovery occurs, the evacuation destination channel is instructed to evacuate (return) to the M channel again, and the operation continues on the original M channel. If self-recovery does not occur, continue operation on the channel to be purged, and continue to operate until there is no more resource available.

  Further, since the MPU does not know whether or not the eviction destination channel is operating, there is a possibility that the MPU issues a call setting request to the eviction destination channel. If call setup is requested for the eviction destination channel, the information of the original M channel used as the current eviction destination channel is expelled to another empty channel (re-eviction), and the operation is continued there. . In this case as well, if all resources are full, an alarm is notified to the MPU that a call control failure has occurred.

  From the above, it is clear that the second embodiment can be implemented not only in the demodulator of the baseband processing unit but also in a similar system with call control processing, as in the first embodiment. Can be played. In addition, it becomes a structure which has the same effect, without increasing a circuit scale by the point which does not need to provide a reserve channel part like Example 1. FIG.

  (Supplementary note 1) In a radio base station in which a baseband processing card is equipped with a call control unit that performs multi-channel processing, a path detection unit, and a despreading unit, the path detection unit and the despreading unit respectively correspond to a predetermined current channel. In addition to the path detection processing unit and the despreading processing unit, each has a spare channel unit, and when a call setup request is input from the host device to the call control unit, a channel is designated for the path detection unit and the despreading unit. A call control processing unit for sending a call setting request, a failure monitoring unit for detecting a failure by monitoring the presence of a confirmation response to the call setting request, and a failure detection by the failure monitoring unit And a resource management control unit that performs processing of the channel in which the failure has been detected when the spare channel unit is idle when the spare channel unit is idle, to the spare channel unit. When the failure monitoring unit receives a confirmation response from the spare channel unit to be evicted, the number of the spare channel unit is converted to the original channel number in which the failure has occurred and responds to the host device. A wireless base station.

  (Supplementary note 2) In Supplementary note 1, in the process of expelling the processing of the failed channel to the backup channel unit, the call setup request and the setting parameter of the failed channel are transferred to the backup channel unit. And a response from the spare channel section to be driven out is monitored by the failure monitoring section.

  (Supplementary note 3) In Supplementary note 1, a plurality of units of the path detection unit and the despreading unit are mounted on a baseband processing card, the spare channel unit is provided in each unit, and the path monitoring unit or When a failure of the despreading unit is detected, the resource management control unit performs a eviction process on the backup channel unit of the same unit as the unit in which the failure is detected, and the backup channel unit that has performed the eviction process When a failure is detected by monitoring by a failure monitoring unit, the resource management control unit performs a process of evicting the processing of the channel in which the failure is detected in a spare channel unit of another unit on the same card. Radio base station.

  (Supplementary Note 4) In a radio base station in which a baseband processing card is equipped with a call control unit that performs multi-channel processing, a path detection unit, and a despreading unit, the path detection unit and the despreading unit respectively correspond to predetermined working channels. Call control including a path detection processing unit and a despreading processing unit, and when a call setup request from a higher-level device is input to the call control unit, a channel is designated to the path detection unit and the despreading unit and a call setup request is transmitted A processing unit, a fault monitoring unit that detects a fault by monitoring the presence of an acknowledgment from each of the call setup requests, and a path that is activated by detecting a fault by the fault monitoring unit and that detects the fault A resource management control unit that detects a free channel of the detection unit or the despreading unit and performs processing of the failed channel to the detected free channel; When the failure monitoring unit receives a confirmation response from the empty channel to be evicted by processing, the number of the empty channel is converted to the original channel number in which the failure has occurred and responds to the host device. A wireless base station.

  (Supplementary Note 5) In Supplementary Note 4, the eviction process of the failed channel to the empty channel is performed by transferring a call setup request and a setting parameter of the failed channel to the empty channel, and A radio base station, wherein a failure monitoring unit monitors a response from a vacant channel to be driven out.

  (Supplementary Note 6) In Supplementary Note 4, when a call setup request is issued from a higher-level device to the channel that has been purged by the eviction process, the resource management control unit detects another empty channel and detects the eviction destination. A wireless base station, wherein the call setting information of the first channel is transferred to the other vacant channel to perform eviction processing, and the call setting information of the first eviction source channel is copied and transferred.

  (Supplementary note 7) In Supplementary note 4, when a plurality of units of the path detection unit and the despreading unit are mounted on a baseband processing card and the failure monitoring unit detects a failure of the path detection unit or the despreading unit, The resource management control unit performs eviction processing on an empty channel in the same unit as the unit in which the failure has occurred, and if there is no empty channel in the same unit, the resource management control unit sets an empty channel in another unit on the same card. A radio base station that performs an eviction process for a channel in which the failure is detected.

  (Supplementary Note 8) In Supplementary Notes 1 to 7, the resource management control unit performs self-recovery processing for the channel in which the failure of the eviction source has occurred while continuing the operation at the eviction destination by the eviction processing, and performs self-recovery. A radio base station characterized by performing control to return the eviction destination process to the original channel when the signal is detected.

It is a figure which shows the 1st basic composition of this invention. It is a figure which shows the 2nd basic composition of this invention. FIG. 10 is a diagram illustrating a flowchart (part 1) in the call control unit according to the first embodiment. FIG. 10 is a diagram illustrating a flowchart (part 2) in the call control unit according to the first embodiment. FIG. 10 is a diagram illustrating a flowchart (part 3) in the call control unit according to the first embodiment. FIG. 9 is a diagram illustrating a flowchart (part 4) in the call control unit according to the first embodiment. FIG. 10 is a diagram illustrating a flowchart (part 1) in the call control unit according to the second embodiment. FIG. 10 is a diagram illustrating a flowchart (part 2) in the call control unit according to the second embodiment. FIG. 10 is a diagram illustrating a flowchart (part 3) in the call control unit according to the second embodiment. FIG. 10 is a diagram illustrating a flowchart (part 4) in the call control unit according to the second embodiment. FIG. 10 is a diagram illustrating a flowchart (No. 5) in the call control unit according to the second embodiment. It is a figure which shows the structure of a prior art example. It is a figure which shows the example of the flowchart of the call control process part of a prior art example. It is a figure which shows the outline | summary of the operation | movement sequence corresponding to progress of time when there exists a reception request of M channel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Call control part 10 Call control process part 11 Resource management control part 12 Failure monitoring part 2 Path detection part 20 Path detection process part 21 Spare channel part 3 Despreading part 30 Despreading process part 31 Spare channel part 4 MPU

Claims (5)

In a radio base station equipped with a call control unit that performs multi-channel processing, a path detection unit, and a despreading unit on a baseband processing card,
Each of the path detection unit and the despreading unit includes a spare channel unit in addition to the path detection processing unit and the despreading processing unit corresponding to each of the currently used predetermined channels,
When a call setup request from a host device is input to the call control unit, a call control processing unit that sends a call setup request by designating a channel to the path detection unit and the despreading unit, and sending the call setup request A fault monitoring unit that detects a failure by monitoring whether there is a confirmation response from each of the channels, and a channel that has been detected as having failed when the spare channel unit is activated by detecting a failure by the failure monitoring unit. A resource management control unit that performs a process of expelling the processing to the backup channel unit;
When the failure monitoring unit receives a confirmation response from the spare channel unit to be purged by the eviction process, the spare channel number is converted to the original channel number where the failure has occurred and responds to the host device. A wireless base station characterized by that. In claim 1,
A plurality of units are mounted on the baseband processing card with the path detection unit and the despreading unit, and the spare channel unit is provided in each unit,
When a failure of the path detection unit or the despreading unit is detected by the failure monitoring unit, the resource management control unit performs eviction processing on a backup channel unit of the same unit as the unit in which the failure is detected,
When a failure is detected by monitoring the spare channel unit that has performed the eviction process, the resource management control unit detects the failure in the spare channel unit of another unit on the same card. A radio base station characterized by performing channel eviction processing. In a radio base station equipped with a call control unit that performs multi-channel processing, a path detection unit, and a despreading unit on a baseband processing card,
The path detection unit and the despreading unit each include a path detection processing unit and a despreading processing unit corresponding to a predetermined channel in use,
When a call setup request from a host device is input to the call control unit, a call control processing unit that sends a call setup request by designating a channel to the path detection unit and the despreading unit, and for sending the call setup request A fault monitoring unit that monitors the presence of a confirmation response from each of them and detects a fault, and detects a free channel of a path detection unit or a despreading unit that is activated by the fault detection by the fault monitoring unit and detects a fault. A resource management control unit that performs eviction processing to the detected free channel for processing of the failed channel;
When the failure monitoring unit receives an acknowledgment from the empty channel that is the eviction destination by the eviction process, it converts the number of the vacant channel into the original channel number where the failure has occurred and responds to the host device. A radio base station characterized by. In claim 2,
The resource management control unit, when a call setup request is generated from a higher-level device for a channel that has been a eviction destination by the eviction process, detects another empty channel and obtains call setting information of the eviction destination channel. A radio base station that transfers to another empty channel, performs eviction processing, and copies and transfers call setting information of the first eviction source channel. In claims 1 to 4,
The resource management control unit executes self-recovery processing for the channel in which the failure of the eviction source has occurred while continuing the operation at the eviction destination by the eviction processing. When self-recovery is detected, the resource management control unit A radio base station that performs control to return to the original channel.

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