JP5012295B2 - Base station apparatus and area relief method when base station apparatus fails - Google Patents

Description

  The present invention relates to a mobile communication base station apparatus and a base station apparatus (hereinafter referred to as a radio base station apparatus) area recovery method in the event of a failure, and more specifically, a baseband process of the radio base station apparatus and the radio base station apparatus The present invention relates to an area relief method for a shared wireless channel when a card (BBP card: Base-Band Processor Card) fails.

  In recent years, several high-speed wireless communication systems have been proposed for third-generation mobile communication technology. Among them, IMT-2000 is standardized by ITU (International Telecommunication Union), and 3GPP (3rd Generation Partnership Project) is one of the groups of specific detailed specifications of the standard for realizing the requirements. In addition, a standard such as Super 3G Release 99 has been proposed as a specification that further expands this 3GPP.

  FIG. 13 shows an outline of a network configuration to which such a mobile communication standard is applied. The mobile device 80 communicates with the radio base station device 81 through a radio section, and the radio base station device 81 is connected to a core network 82 by wire.

  FIG. 14 shows the configuration of the radio base station apparatus. 14 includes a baseband processing card (BBP card) 82-1 to 82-n, a control unit 83, a transmission path 84-1 for transmitting a control signal (C-Plane), and user data (U -Plane), and a transmission line termination unit 85.

  The surrounding area covered by this radio base station apparatus 81 is divided into a plurality of sectors 1 to n, and communication with mobile devices located in the areas of each sector 1 to n is provided corresponding to each sector. Processed by the received baseband processing cards (BBP cards) 82-1 to 82-n, control signals are transmitted to and received from the control unit 83, and user data is transmitted to the core network (82 in FIG. 13) via the transmission line termination unit 85. Are sent and received.

  As functions of the baseband processing card, there are a function of degenerating the accommodated shared radio channel and a function of moving the shared radio channel. Further, the transmission side (downlink) functions include an error detection code addition function, a function of transmitting signals from a plurality of antennas, a function of performing transmission power control, and the like. On the receiving side (uplink), there are a function of receiving a random access channel and estimating a round trip propagation delay in a radio section, a function of performing diversity reception, a function of performing channel estimation using a reference channel, and the like.

  In the conventional technology, in the 3GPP standard specifications, as a channel shared by a plurality of mobile stations, DSCH (Downlink Shared Channel), CPCH (Uplink Shared Channel: Common Packet Channel), PCH, Various shared channels such as (uplink shared channel used for transmission of paging signal: Paging Channel) and HS-DSCH (High-Speed-Downlink Shared Channel) are used in Super 3G. In a certain LTE (Long Term Evolution) specification, a radio channel of a type called “SCH (Synchronization Channel)” shared by many users is fixedly assigned to each baseband processing card and processed.

  In the configuration of FIG. 14, when a failure occurs in the baseband processing card assigned to the sector where the mobile station is located, the assigned shared radio channel becomes unusable, and the entire area covered by the corresponding channel Use of the shared radio channel by the mobile station becomes impossible.

  As a conventional technique for relieving this, there is a method of transferring the shared radio channel processed by the baseband processing card in which the failure has occurred to another baseband processing card that is operating normally. There are cases where the shared wireless channel cannot be transferred due to the performance of the baseband processing card and the number of facilities.

  In addition, if the baseband processing card has a redundant configuration, redundant baseband processing cards are required and redundant functions must be implemented, which may increase development costs and equipment costs. Is expensive.

  Even if the baseband processing card has a redundant configuration, such a case occurs when there are multiple failures up to the redundant baseband processing card.

In wireless communication technology, the traffic volume in the cell specified by the base station is monitored, and when the traffic volume is large, the voice compression is increased and transmitted at a low bit rate, and the traffic volume is small. In such a case, a technique is known in which the amount of information bits is made variable so that the audio compression rate is reduced and transmitted at a high bit rate, and the effective transmission speed is secured while the transmission / reception cycle is fixed (see Patent Document 1). However, this technology does not deal with the failure of a baseband processing card having a processing function including control of a shared channel for each sector of a base station, that is, an area mobile station.
Japanese Patent Laid-Open No. 7-38465

  As described above, when a failure occurs in the baseband processing card that includes the shared radio channel control function, it is better for the user to maintain the area area to be covered than the bandwidth and number of users that the shared radio channel can accommodate. It is clear that it is important as a service. This is because the effect when an unconnected area occurs is more important than the effect of a person who is not connected.

  The present invention maintains communication in a communication area covered by a sector without redundancy when a failure occurs in each baseband processing card that performs communication processing using a shared radio channel assigned to the sector. An object of the present invention is to provide a base station apparatus that can be used and an area relief method in the event of a base station apparatus failure.

  FIG. 1 is a diagram showing a principle configuration of the present invention. In the figure, 1 is a radio base station apparatus, 2 is a plurality of baseband processing cards (BBP cards) provided in the radio base station apparatus 1, 2-1 to 2-n represent individual cards, The card communicates with a mobile station located within the area of each sector using a unique shared radio channel. In this description, the baseband processing card 2-2 performs processing on the mobile device in the sector 2 area, but a failure occurs in this card, and the baseband processing card 2-1 is the baseband processing card of the rescue destination. Shall. Although each baseband processing card has the same configuration, the card 2-1 is shown as having means 2a to 2c as means for functioning as a rescue destination, 2a being a shared radio channel / user state confirmation means, 2b Is a shared radio channel degeneration means, and 2c is a shared radio channel transfer means.

  3 is a control unit constituted by each of the means 3a to 3e, 3a is a faulty card detection means for detecting a baseband processing card in which a fault has occurred, and 3b is a process using the shared radio channel used by the faulty card. Relief destination card selection means for selecting another card to be relieved, 3c is a reconfiguration instruction means for the mobile device subordinate to the relief destination card, 3d is a degeneration / relocation instruction means for the shared radio channel, and 3e is an area under each BBP card A baseband processing card management table 10 storing information such as name, number of shared radio channels, number of accommodated users, etc., is connected to each baseband processing card 2-1 to 2-n via a user data path, One end connected to the control signal path is a transmission line termination section connected to an external core network (not shown).

  4 is a mobile device under the control of the radio base station apparatus 1, 4-1 is a mobile device that is located in the sector 1 area and performs communication processing by the baseband processing card 2-1, and 4-2 is sector 2. Mobile station in which communication processing is performed by the baseband processing card 2-2.

  When a failure occurs in the baseband processing card 2-2, the failed card detection unit 3a of the control unit 3 detects the failed baseband processing card 2-2, and the rescue destination card selection unit 3b detects the failure card 2-2. The processing function using the shared wireless channel is relieved, that is, a card that can relocate the shared wireless channel of the failed card is selected by referring to the baseband processing card management table 3e from the active baseband processing card To do. Note that this relocation includes degeneration of the shared wireless channel of the rescue card. In this description, it is assumed that the baseband processing card 2-1 is selected as the rescue destination card. Next, the reconfiguration instruction means 3c performs a reconfiguration including degeneration of the shared radio channel to each mobile device including the mobile device 4-1 under its control via the baseband processing card 2-1 that is the selected rescue destination card. Instruct the configuration. The card 2-1 does not need to degenerate the shared radio channel band currently used to accept the shared radio channel of the faulty card 2-2. For example, if there is an empty band, the card 2-1 does not degenerate. . Subsequently, the degeneration / relocation instruction means 3d degenerates the baseband processing card 2-1 to be relieved if it is necessary to degenerate the shared radio channel, and transfers the shared radio channel of the failed card 2-2. Instruct. The reason why the shared radio channel of the baseband processing card 2-1 to be rescued is degenerated is to relocate the entire shared radio channel of the baseband processing card 2-2 that has become an obstacle or a degenerated version thereof. is there.

  In the rescue destination baseband processing card 2-1 that has received this instruction, the shared radio channel / user status confirmation means 2a uses the shared radio channel, for example, the number of channels to be used, its bandwidth, etc. and the user status, for example, the users in the area. Check the number and usage status. If it is necessary to degenerate the confirmed current shared radio channel, the shared radio channel degeneration means 2b performs degeneration processing, and then the shared radio channel transfer means 2c shares the baseband processing card 2-2 that has failed. A process of moving the wireless channel to the card 2-1 is executed. Along with the execution of this relocation, broadcast information including shared radio channel information newly provided to sector 1 by baseband processing card 2-1 for the area of sector 2 covered by baseband processing card 2-2. And broadcast information is notified to each mobile station in sector 2.

  In the above description, an example is described in which the shared radio channel used in the rescue destination card 2-1 is degenerated and the shared radio channel of the card 2-2 that has been damaged due to the provision of an empty band is transferred. As described above, when the free bandwidth obtained by the reduction at the rescue destination card 2-1 is small, the shared radio channel of the faulty card 2-2 is degenerated and then the rescue destination card 2-1. It can be configured to relocate.

  According to the present invention, the shared radio channel and the area covered by the shared radio channel can be maintained by moving the shared radio channel used in the failed baseband processing card to another baseband processing card that is operating normally. Become.

  Also, if the shared radio channel used by the failed baseband processing card cannot be relocated as it is due to performance limitations of the baseband processing card, etc., it is possible to maintain the shared wireless channel bandwidth and the number of users accommodated by degeneration. In order to prioritize the maintenance of the communication area to be covered, it is possible to maintain the communication area by reducing the bandwidth and the number of accommodated users, that is, performing degeneration.

  As the bandwidth is changed and the number of accommodated users is reduced, reconfiguration of the shared radio channel is performed on the mobile devices connected with the shared radio channel, or new connections are made with the shared radio channel. By changing the broadcast information to the mobile device, an existing call can be connected.

  FIG. 2 is a mutual operation sequence between the units in the radio base station apparatus of the embodiment and with the mobile device. The wireless base station apparatus of FIG. 2 is provided with only two baseband processing cards (hereinafter referred to as BBP cards) shown in FIG. 1, BBP card 2-1 and BBP card 2-2. Similarly, a failure occurs in the BBP card 2-2, and the BBP card 2-1 is a card that rescues the BBP card 2.

  3 shows an example of the configuration of the baseband processing card, and shows an example of the internal block configuration of the baseband processing cards 2-1 to 2-n (including the BBP cards 1 and 2 in FIG. 2) shown in FIG. In the figure, 2 is a BBP card, 20 is an interface (I / F) with the wireless side (wireless mechanism with the mobile device side), 21 is a downlink (DL: downlink side) processing unit, and 21a inside thereof Is an RLC (Radio Link Control) / MAC (Madia Access Control) layer processing unit, 21b is an encoding processing unit, and 21c is a modulation unit. 22 is an uplink (UL: uplink side) processing unit, 22a is a demodulation unit, 22b is an encoding processing unit, and 22c is an RLC / MAC layer processing unit. Reference numeral 23 denotes an IP packet termination processing unit, and 24 denotes a CPU / monitoring control unit.

  The CPU of the CPU / monitoring control unit 24 communicates with the control unit (3 in FIG. 1) of the radio base station device, and the HC operation (health check: control unit (in FIG. 1) in the device between the BBP card and the control unit. 3) by responding to inquiries that occur at a fixed period from the above 3), information set in the baseband processing card management table 3e (shared wireless channel) Information, the number of users, etc.) is notified to the control unit, and the CPU / monitoring control unit 24 monitors the status of each functional unit in the BBP card periodically, so that the occurrence of a failure is immediately detected. It has a function to detect.

  The downlink processing unit 21 performs downlink user data processing and control signal processing, and the processing flow is defined by 3GPP in the RLC / MAC layer processing unit 21a for data from the core network side. RLC / MAC processing is performed, and processing such as turbo encoding is performed by the encoding processing unit 21b. The processed data is modulated into a format that can be transmitted to the wireless side by the modulator 21c, and the data is transmitted from the BBP card to the user. The error detection code addition function is executed by the encoding processing unit 21b, and a function for transmitting signals from a plurality of antennas and transmission power control are provided in the I / F unit 20.

  The uplink processing unit 22 processes uplink user data and control signals. As a processing flow, the demodulating unit 22a demodulates data transmitted from the wireless side (user side). The encoding processor 22b encodes the digital signal, the RLC / MAC layer processor 22c performs RLC / MAC processing defined by 3GPP, and the data is transmitted from the BBP card to the upper network. The function of receiving a random access channel and estimating the round-trip propagation delay in the radio section and the function of performing diversity reception are executed by the I / F unit 20 and the function of performing channel estimation using the reference channel is the CPU / This is executed in the monitoring control unit 24.

  The control unit 3 in the radio base station apparatus shown in FIG. 2 can be configured by a program control processing device (CPU and memory), and the functions of the units 3a to 3d of the control unit 3 shown in FIG. This can be realized using information in the baseband processing card management table 3e.

  When a failure first occurs in the BBP card 2 (2-2) (a in FIG. 2), the operation stops. This failure is detected by the control unit 3 (same as b). As will be described later, one of a plurality of methods can be selected as a method for detecting that a failure has occurred in the BBP card. The control unit 3 selects a rescue destination BBP card in order to rescue the shared radio channel stored in the BBP card 2 (c in FIG. 2). At this time, if there are two or more BBP cards that are candidates for the rescue destination, refer to the baseband processing card management table (3e in FIG. 1), and the BBP cards of other sectors excluding the BBP card that has failed. Select one of the following. In that case, a BBP card of a sector having a sufficient processing capacity is selected by comparing the bandwidth, the total number of outgoing calls, the total number of incoming calls, etc. in each sector (area).

  In the example of FIG. 2, since only two BBP cards are provided, if the BBP card 2 becomes a failure, the BBP card 1 is selected as a rescue destination card. The controller 3 performs “Physical Channel Reconfiguration” (Physical Channel Reconfiguration) on the 3GPP network layer (Layer 3) RRC (Radio Resource Control) protocol for the mobile devices under the BBP card 1, and the shared radio channel is A message including degeneration is notified (d in FIG. 2). This message is received by the BBP card 1, and is further notified from the BBP card 1 to the mobile device 4-1 in the subordinate area of the BBP card 1 card (e in FIG. 2). When received by the mobile device 4-1 in the area under the BBP card 1, the mobile device 4-1 transmits “Physical Channel Reconfiguration Complete” (physical channel reconfiguration complete) indicating reception confirmation to the BBP card 1 (see FIG. 2 f), the data is further transmitted from the BBP card 1 to the control unit 3 (g). Receiving this, the control unit 3 transmits a bandwidth reduction / relocation start instruction of the shared radio channel to the rescue destination BBP card 1 (h in FIG. 2). This instruction includes information on the shared radio channel of the BBP card 2 to be transferred.

  Upon receiving this instruction, the BBP card 1 confirms the BBP card 1 shared radio channel state, confirms the BBP card 1 accommodating user (i in FIG. 2), and starts degeneration of the shared radio channel (same j). Subsequently, transfer of the shared radio channel (transfer of the shared radio channel of the BBP card 2 to the BBP card 1) is started (k in FIG. 2), and when the transfer is completed, the shared radio channel / bandwidth reduction / A transfer completion notification is sent to the control unit 3 (l in FIG. 2). Receiving this, the control unit 3 notifies the BBP card 1 that the broadcast information (shared radio channel or the like) on the paging channel has changed (m in FIG. 2). Specifically, the content is “Page / BCH / BCCH Modify Information” (information for changing the paging / shared radio channel BCH / BCCH). The BBP card 1 further notifies this notification to the mobile device 4-1 in the subordinate area of the BBP card 1 and the mobile device 4-2 in the subordinate area of the BBP card 2 (area of the failure sector) via the paging channel (n, o). Thereby, the communication of the mobile device in the area under the BBP card 2 is resumed (p in FIG. 2), and the area relief is completed (q).

Fault detection method for BBP card
(1) Detection method 1 by health check (equivalent to RAS function) in the radio base station device
The radio base station apparatus includes a BBP card and a control unit. The control unit manages in-device state monitoring, accommodation area information, accommodation users, and the like. In the in-device state monitoring, the control unit and each subordinate BBP card are managed. And health check. When a failure occurs in the BBP card installed in the device, the control unit monitors the health check status, and the health check signal from the failed BBP card can no longer be detected. Is detected.

  FIG. 4 is an explanatory diagram of a BBP card failure detection method 1. In the figure, 1 is a radio base station apparatus, 2-1 to 2-3 are BBP cards 1 to BBP cards 3 and 3 are control units, and are provided with three BBP cards. A. of FIG. Represents a state in which the control unit 3 performs a health check on each of the BBP cards 1 to 3. If a failure occurs in the BBP card 1 in this state, B. As shown in FIG. 4, the control unit 3 detects a health check failure with the BBP card 1 and detects that a failure has occurred in the BBP card 1.

(2) Detection method 2 by comparing the number of incoming / outgoing calls by sector that each BBP card contains
The total number of outgoing / incoming calls per sector is monitored and compared. The number of outgoing / incoming calls per sector is monitored by the control unit 3, and the number of incoming / outgoing calls in a specific sector is significantly reduced (for example, reduced to 1/10). Thus, the failure of the BBP card is detected. By adopting this method, if the BBP card passes the health check signal but cannot be processed by the BBP card, the BBP card is operating normally without using the BBP card. The service can be saved and the service can be stopped. Further, the occurrence of a failure can be detected even when the BBP card is repeatedly operated to stop and recover.

  FIG. 5 is an explanatory diagram of the BBP card failure detection method 2, and FIG. 6 is a diagram showing the configuration of the BBP card management table (corresponding to 3e in FIG. 1). A. of FIG. ~ D. In FIG. 4, the reference numerals of the respective parts are the same as those in FIG. 4, and the BBP card is provided with three BBP cards 1 to 3. A. , The control unit 3 monitors the number of incoming / outgoing calls in the sectors covered by the BBP card 1 to the BBP card 3. Then B. When a check signal is transmitted from the BBP card 1 to the health check from the control unit 3 and no abnormality is detected by the health check as shown in FIG. When it is detected that the number of outgoing / incoming calls in the sector covered by the BBP card 1 is 0 or the total number of outgoing / incoming calls in 30 seconds as the number of protection steps is 1/10 or less of the previous outgoing / incoming call number, FIG. D.5. As shown in FIG. 5, the control unit 3 determines that a failure has occurred in the BBP card 1, and shifts to an area relief sequence to transfer a shared radio channel under the BBP card 1.

  The determination of the decrease in the number of outgoing / incoming calls uses the BBP card management table shown in FIG. In the example of this table, information such as accommodation area name, shared radio channel, bandwidth, number of accommodated users, total number of outgoing calls, and total number of incoming calls is set. This information is held for each BBP card. This table is updated periodically (for example, every second), and the control unit monitors this table, and if it detects that the condition that the number of incoming / outgoing calls decreases at the rate described above, judge.

  Next, a method for selecting a rescue destination BBP card when a failure occurs in the BBP card in the radio base station apparatus will be described. The control unit 3 monitors the state of each BBP card from the BBP card management table as shown in FIG. 6, and shares wireless channel information, band information, accommodated user information, and area accommodated in the failed BBP card. The control unit 3 recognizes the information, and gives an instruction to transfer each shared radio channel, area information, etc. accommodated in the information to another normally operating BBP card.

  FIG. 7 shows a specific example of detection of the rescue destination BBP card by the control unit. A. of FIG. ~ D. 1, 2-1 to 2-3, the same reference numerals as those in FIGS. Also in this example, there are three BBP cards mounted on the radio base station apparatus.

  A. of FIG. When the controller 3 detects a failure of the BBP card 1 as shown in FIG. As shown in FIG. 2, the control unit 3 confirms the state of the BBP card 2 and the BBP card 3 that are operating normally. In this case as well, the control unit 3 manages the BBP card management table as shown in FIG. 6, confirms the state of the BBP card operating normally from this table, and accommodates it in the BBP card 1 that has failed. Determine whether the shared wireless channel can be relocated. If the shared radio channel accommodated in the BBP card 1 can be accommodated in the BBP card 2 and the BBP card 3, it is relocated and relocated, and the area of the BBP card 1 is relieved. At this time, the BBP card 2 and the BBP card 3 are not degenerated (when relocation is possible without degeneration). C. of FIG. If the shared radio channel cannot be relocated unless the BBP card 2 and the BBP card 3 are degenerated as shown in FIG. 6, the BBP card having the smallest number of accommodated users is selected from the BBP card management table of FIG. A degeneration instruction such as a shared radio channel bandwidth is issued. C. of FIG. In this example, the BBP card 2 is selected as the rescue destination, a degeneration instruction is issued to the BBP card 2, and D.D. When the degeneration is completed, the shared radio channel accommodated in the BBP card 1 is moved to the BBP card 2 and the entire area is covered by the BBP card 2 and the BBP card 3 as shown in FIG.

Specific example of degeneration of shared radio channel and transfer of shared radio channel by BBP card In the radio base station apparatus in which BBP card 1 to BBP card 3 are mounted, it was selected as a rescue destination when a failure occurred in the BBP card In the BBP card 2, a determination is made as to whether or not degeneration is necessary in the BBP card 2 in order to accommodate the shared radio channel accommodated in the BBP card 1.

  The determination determines whether the shared wireless channel accommodated in the BBP card in which the failure has occurred in the remaining BBP card when the failure occurs satisfies the condition that it cannot be accommodated without degeneration. If this condition is satisfied, the resources of each BBP card that is operating normally is 100% used, so that the BBP card that is operating normally is degenerated to relieve the area covered by the failed BBP card. An instruction is notified from the control unit.

  If the above conditions are not met, if all or a plurality of BBP cards that are operating normally can be used to relieve the shared radio channel accommodated in the failed BBP card without degeneration, the BBP card No degeneration is performed.

  FIG. 8 shows an example of relieving with one BBP card without performing degeneration. Also in this example, three BBP cards are provided in the radio base station apparatus. As shown in FIG. 4, the BBP card 1 is operating with radio channels (CH) # 1, # 2, BBP card 2 is receiving radio channels # 3, # 4, and the BBP card 3 is receiving radio channels # 5, # 6. At this time, it is assumed that the BBP card 1 has failed. At this time, the BBP card 2 and the BBP card 3 have a sufficient bandwidth for the shared radio channel, and the radio channels # 1 and # 2 of the BBP card 1 can be accommodated in both the BBP cards 2 and 3 without degeneration. . B. of FIG. In this case, the radio channels # 1 and # 2 of the BBP card 1 are transferred to the BBP card 2.

  FIG. 9 shows an example of relieving with a plurality of BBP cards without performing degeneration. Also in this example, three BBP cards are provided in the radio base station apparatus. In the state shown in FIG. 2, each of the BBP cards 1 to 3 is assumed to accommodate two shared radio channels, and each BBP card has a margin to accommodate one channel of the band of each radio channel. If a failure occurs in the BBP card 1 in this state, As shown in FIG. 2, the wireless channels # 1 and # 2 of the BBP card 1 are divided into two, the shared wireless channel # 1 is transferred to the BBP card 2, and the shared wireless channel # 2 is transferred to the BBP card 3. Relief is performed without performing degeneration on the cards 2 and 3.

  FIG. 10 is a flowchart of area relief accommodated in the faulty BBP card, which is executed in the control unit (configured by a processing device including a CPU and a memory) of the radio base station device.

  When a failure occurs in the BBP card (S1 in FIG. 10), the failure of the BBP card is detected by the control unit (displayed by the CONT unit) (S2), and the rescue destination BBP card is selected by the control unit (S3). Physical channel reconfiguration is performed on the user (displayed by UE) accommodated in the rescue destination BBP card (S4). Next, the shared wireless channel state confirmation and the bandwidth state confirmation of the rescue destination BBP card are performed (S5 in FIG. 10), and it is determined whether or not the BBP card can be relocated without degeneration (S6). In this case, it is determined whether the total bandwidth of the shared radio channels accommodated in the failed BBP card can be transferred to the rescue destination BBP card as it is. It is determined that there is a need for However, it is assumed that one BBP card is selected as the rescue destination in step S3.

  If it is determined in step S6 that it cannot be transferred to the BBP card without degeneration, degeneration of the shared radio channel and bandwidth of the rescue destination BBP card is started (S7), and it is determined whether the degeneration is complete ( When the process is completed, transfer of the shared wireless channel (of the failed BBP card) to the BBP card of the rescue destination is started (S9). If it can be transferred to the BBP card of the rescue destination without degeneration in step S6, the process proceeds to step S9. If it is determined in step S10 that the relocation is completed, the user equipment under the degenerated / relocated shared radio channel is notified that the broadcast information (BCH and BCCH Modyfy information of the shared radio channel) has changed (see FIG. 10 S11), the area relief is completed.

  FIG. 11 is a specific example of degeneration and relocation including the occupied band. A. of FIG. ~ E. Is an example in which three BBP cards are used. The BBP card 1 accommodates channel 1 (CH1) and channel 2 (CH2) as shared radio channels, each having an occupied bandwidth of 20 MHz, and the BBP card 2 is channel 3 (CH3) and channel as shared radio channels. 4 (CH4) is accommodated and each has an occupied bandwidth of 20 MHz. The BBP card 3 accommodates channels 5 (CH5) and 6 (CH6) as shared radio channels, each having an occupied bandwidth of 20 MHz. . Further, 11a to 11e are respectively A.E. ~ E. The state of the wireless channel used in the area (sector) covered by the shared wireless channel in the state of.

  A. If a failure occurs in the BBP card 1 in the initial state shown in FIG. Thus, the BBP card 1 becomes unusable, and the state of the area (sector) at that time becomes unusable for the radio channel 1 (CH1) and the radio channel 2 (CH2) as shown in 11b. In this case, if the BBP card 2 is selected as the relief BBP card, C.D. When the BBP card 2 is selected as the relief BBP card, the occupied bandwidth 20 MHz of the channel 4 (CH4) used therein is degenerated to 5 MHz, and the channel 1 (CH1) of the BBP card 1 is selected. And channel 2 (CH2) are degenerated from 20 MHz to 5 MHz and transferred to the BBP card 2, so that the radio channel 3 remains unchanged in the BBP card 2, and the radio channel 4 is degenerated and reduced to 5 MHz. When completed, the radio channels 1 and 2 are also degenerated and transferred to the BBP card 2 at 5 MHz respectively.

  In FIG. If a failure occurs in the BBP card 3 in the state of It will be in the state shown in. In this case, E.I. As shown in FIG. 2, the radio channel 3 of the BBP card 2 is degenerated and a margin is provided for the band, and the radio channels 5 and 6 accommodated in the BBP card 3 are degenerated and transferred to the BBP card 2. As a result, the band of the shared radio channel in each sector becomes narrow, but E. As shown in Fig. 4, communication in all areas is possible.

  E. of FIG. When the failure of the BBP card 3 is recovered (card replacement, etc.) As described above, the bandwidth of the wireless channel 3 of the BBP card 2 is expanded to the original 20 MHz, and the wireless channels 5 and 6 are transferred (recovered) to the BBP card 3. If the BBP card 1 is restored after that, B. of FIG. To A. The state changes.

  FIG. 12 shows a call connection sequence for users under a degenerated / relocated radio channel. In the figure, 1 is a radio base station (including a BBP card, a control unit, etc.), 4 is a mobile device, and 5 is a core network (indicated by CN).

  When the failure of the BBP card first occurs (a in FIG. 12), the rescue destination BBP card is selected and the radio channel (CH) to be degenerated in the rescue destination BBP card is selected (same b). In this way, packet data # 1 (Packet Data # 1) is transmitted from the core network 5 destined for the mobile device 4 in the area covered by the faulty BBP card to the radio base station apparatus 1 (c in FIG. 12). From this point, it is supposed to be further transmitted to the mobile device 4 (c '). However, since a failure has occurred in the BBP card that processes communication with the mobile device 4, the packet data # 1 is discarded. (D). Thereafter, when the packet data # 2 is sent during the period of the degeneration or relocation process in the BBP card as the rescue destination, the data is stored in the storage means (not shown).

  After that, degeneration is performed in the selected BBP card as the rescue destination. When degeneration is performed, a “physical channel reconfiguration” message (including factors such as “node failure” and “area / resource shortage”) to the mobile device 4 under the BBP card of the rescue destination Is transmitted (f in FIG. 12), and a response of “physical channel reconfiguration complete” is returned from the mobile device 4 (same g). The processing period of the reception of the “physical channel reconfiguration instruction” and the response of “physical channel reconfiguration complete” is called the driving time (Activation Time) of the mobile device 4 as shown in FIG.

  The mobile device 4 (within the relief destination area) executes radio parameter change (occupied bandwidth, etc.) (h in FIG. 12), and the radio base station device performs degeneration of the radio channel of the rescue destination BBP card (same as i). ), The wireless channel is moved to the rescue destination card (same as j). As a result, data transmission is resumed (k in FIG. 12), and the stored packet data # 2 destined for the mobile device under the BBP card that has failed is transmitted (l), and then the core network 5 Is transmitted to the mobile device (same m, m ′). Subsequently, when the broadcast information for the area of the degenerated / relocated radio channel is changed (same as n), the broadcast information is notified to the mobile station to which the shared radio channel is relocated (the mobile station in the area covered by the faulty BBP card). (Paging / BCH, BCCH, etc.) is notified (same as above), and area relief is completed.

  With the operation sequence of FIG. 12, the call connection with the mobile station that has been disconnected once with area relief can be resumed.

  (Supplementary note 1) In a base station apparatus provided with a plurality of baseband processing cards for each area corresponding to modulation / demodulation of a radio signal for a mobile device and processing of a signal for a core network, means for detecting a failure of the baseband processing card; , Relief destination card selection means for selecting a baseband processing card that covers another area for relief of the area covered by the shared wireless channel of the card in which the failure is detected, and subordinates of the selected relief destination card A control unit comprising means for instructing reconfiguration of a shared radio channel for the mobile station, means for instructing degeneration / relocation to the rescue destination card, the shared radio channel instructed by the control unit, and the Degeneration means for performing degeneration of the self-shared radio channel according to the user status, and shared radio of the card in which the failure is detected Baseband processing having a relief card provided with a transfer means for transferring a channel to the own card, and providing signal processing by the shared radio channel in the area of the baseband processing card that has failed for other areas A base station apparatus which is relieved by a card.

  (Supplementary Note 2) In Supplementary Note 1, the baseband processing card failure detection means sequentially performs periodic health checks on each baseband processing card, and detects a baseband processing card that cannot detect a health check as a failure. A base station apparatus for detecting or monitoring a total number of outgoing / incoming calls by sector in each of the plurality of baseband processing cards, and detecting a baseband processing card of a sector in which the number of outgoing / incoming calls is significantly reduced as a failure .

  (Supplementary note 3) In an area relieving method in the event of a base station apparatus failure comprising a plurality of baseband processing cards for each area corresponding to modulation / demodulation of a radio signal for a mobile station and signal processing for a core network, the control of the base station apparatus The unit detects a failure in the baseband processing card, selects a rescue destination baseband processing card that covers another area for relieving the area covered by the shared radio channel of the card in which the failure is detected, and is selected. The reconfiguration of the shared radio channel is instructed to the mobile device under the rescue destination card, the degeneration / relocation is instructed to the rescue destination card, and the rescue destination card is connected to the shared radio channel instructed by the control unit. The self-shared radio channel is degenerated according to the user status, and the shared radio channel of the card in which the failure is detected is transferred to the own card. In this case, the signal processing by the shared radio channel in the area of the baseband processing card that has failed is relieved by the baseband processing card provided for the other area. Method.

  (Additional remark 4) In additional remark 1, the said control part has a card management table which stored information, such as the area which each baseband processing card accommodates, the number of shared radio channels and bandwidth to be used, the number of accommodated users, and the number of incoming / outgoing calls. The base station apparatus is characterized in that the rescue destination card selection means selects a rescue destination card with reference to the card management table.

  (Supplementary Note 5) In Supplementary Note 4, the rescue destination card selection means can transfer all of the shared wireless channels of the baseband processing card that has failed to another one baseband processing card, or other A base station apparatus characterized by determining whether or not a plurality of baseband processing cards can be divided and transferred without being degenerated, and selecting one or more as a rescue destination card.

  (Supplementary note 6) In Supplementary note 4, the rescue destination card selecting means may fail even if the shared radio channel used by another baseband processing card is degenerated, if the shared radio channel of the failed baseband processing card is used. A base station apparatus characterized in that when the bandwidth for relocating a shared radio channel of a new card is insufficient, the shared radio channel of the failed card is degenerated and relocated to the rescue destination card.

It is a figure which shows the principle structure of this invention. It is a figure which shows the mutual operation | movement sequence between each part in the radio base station apparatus of an Example, and a mobile station. It is a figure which shows the structural example of a baseband process card | curd. It is explanatory drawing of the detection method 1 of a BBP card | curd failure. It is explanatory drawing of the BBP card failure detection method 2. It is a figure which shows the structure of a BBP card | curd management table. It is a figure which shows the specific example of the rescue destination BBP card | curd detection by a control part. It is a figure which shows the example relieved by one BBP card | curd, without implementing degeneration. It is a figure which shows the example rescued with a several BBP card | curd, without implementing degeneration. It is a figure which shows the flowchart of the area relief accommodated in the failure BBP card | curd. It is a figure which shows the specific example of degeneration and transfer including an occupied band. It is a figure which shows the sequence of the call connection with respect to the user under the radio | wireless channel degenerated and moved. It is a figure which shows the outline | summary of the network structure of mobile communication. It is a figure which shows the structure of a wireless base station apparatus.

Explanation of symbols

1 Wireless base station device 2 Baseband processing card (BBP card)
2-1 to 2-n BBP card 1 to BBP card n
2a Shared radio channel / user status confirmation means 2b Shared radio channel degeneration means 2c Shared radio channel transfer means 3 Control unit 3a Fault card detection means 3b Relief destination card selection means 3c Reconfiguration instruction means 3d Degeneration / relocation instruction means 3e Baseband processing Card management table 10 Transmission line termination unit 4 Mobile device 4-1 Sector 1 mobile device 4-2 Sector 2 mobile device

Claims (3)

In a base station apparatus provided with a plurality of baseband processing cards for each area corresponding to modulation / demodulation of radio signals for mobile devices and signal processing for core networks,
Means for detecting a failure of the baseband processing card, and a rescue destination card selection for selecting a baseband processing card that covers another area for relieving the area covered by the shared radio channel of the card in which the failure is detected A control unit comprising: means; instructions for instructing reconfiguration of a shared radio channel for a mobile device under the selected rescue destination card; and means for instructing the rescue destination card to degenerate / relocate;
Degeneration means for performing degeneration of the self-shared radio channel according to the shared radio channel and the user status instructed from the control unit, and relocation means for moving the shared radio channel of the card in which the failure is detected to the self-card And a rescue card with
A base station apparatus which relieves signal processing by a shared radio channel in an area of a baseband processing card that has become an obstacle by a baseband processing card provided for another area. In claim 1,
The failure detection means of the baseband processing card is:
Before SL monitors the total outgoing number of incoming sectors different in each of the plurality of baseband processing card, a base station apparatus and detects a baseband processing card sectors number outgoing call is severely degraded as a failure. In an area remedy method in case of failure of a base station apparatus having a plurality of baseband processing cards for each area corresponding to modulation / demodulation of radio signals for mobile devices and signal processing for core networks,
The control unit of the base station apparatus detects a failure of the baseband processing card,
Select a rescue destination baseband processing card that covers another area to rescue the area covered by the shared wireless channel of the card where the failure is detected,
Instruct the reconfiguration of the shared radio channel for the mobile device under the selected rescue card,
Instruct the rescue card to degenerate / relocate,
The rescue destination card performs degeneration of the own shared radio channel according to the shared radio channel instructed by the control unit and the user status, and transfers the shared radio channel of the card in which the failure is detected to the own card. By
An area relief method at the time of failure of a base station apparatus, characterized in that signal processing by a shared radio channel in an area of a baseband processing card that has failed is relieved by a baseband processing card provided for another area.

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