JP5040998B2 - Radio base station apparatus and link disconnection relief method in radio base station apparatus - Google Patents

Description

  The present invention relates to a radio base station apparatus, a radio apparatus, and a link disconnection repair method in the radio base station apparatus, and more particularly, to an apparatus and method using CPRI (Common Public Radio Interface).

  FIG. 14 is a diagram illustrating a configuration of a conventional radio base station apparatus. As shown in FIG. 14, the radio base station apparatus 1 includes a radio control unit 2 that performs monitoring control of radio communication, and a plurality of radio apparatus units 3, 4, which have IQ digital signal transmission / reception functions and analog radio functions. 5 Each of the wireless device units 3, 4, 5 is connected to the wireless control unit 2 by CPRI links 6, 7, 8 using optical fibers. In many cases, the wireless device units 3, 4, and 5 are accommodated together in one rack. Each wireless device unit 3, 4, 5 communicates with mobile terminals 12, 13, 14 in corresponding sectors 9, 10, 11 by radio.

  A CPRI (Common Public Radio Interface) is used as an interface between the wireless control unit 2 and the wireless device units 3, 4, and 5. The specification of CPRI is disclosed in Non-Patent Document 1 below. Here, the radio control unit and the radio device unit are called a control unit (REC: Radio Equipment Control) and a radio unit (RE: Radio Equipment) in the CPRI specification, respectively.

  FIG. 15 shows an outline of a protocol defined by CPRI. In the user information transfer plane (User Plane) 21, IQ data is used. This IQ data is user information of a digital baseband signal and is stored in the IQ data block 22. Transmission / reception of the maintenance monitoring signal is performed using a control & management information plane (Control & Management Plane) 23. At that time, a LAPB (Link Access Procedure Balanced) protocol 25 of HDLC (High-level Data Link Control procedure) 24 is used.

  FIG. 16 shows an example of the signal format of the control and management information plane 23. In FIG. 16, the number on the left indicates the number of bytes, and the number on the top indicates the bit position. 17 to 22 show examples of parameters of the control and management information plane 23. FIG. FIG. 17 and FIG. 18 show a request signal 26 and a response signal 27 when collecting the state of the wireless device unit, respectively. FIG. 19 and FIG. 20 show a request signal 28 and a response signal 29 for controlling the wireless device unit, respectively. FIG. 21 and FIG. 22 show a request signal 30 and a response signal 31 when the wireless device unit is system-reset, respectively.

  23 to 26 show examples of bitmaps on the IQ data block 22 when the IQ data per antenna carrier is 15 bits. FIG. 23 shows an example in which IQ data for one antenna carrier is accommodated. In FIG. 23, I0 and Q0 are the least significant bits (LSB), and I14 and Q14 are the most significant bits (MSB). Within one antenna carrier, IQ data is arranged alternately from LSB to MSB and in chronological order. In addition, no reserve bit is inserted in the middle. FIG. 24 shows an example in which the 14th unassigned bit is a reserved bit (r).

  FIG. 25 shows an example in which IQ data for three antenna carriers is accommodated. In FIG. 26, IQ data for 8 antenna carriers is accommodated in a diversity configuration of 4 carriers (C1 and C2, C3 and C4, C5 and C6, C7 and C8) and 2 branches of each carrier (Br0 and Br1). An example of when to do is shown. In the CPRI link, the amount of data to be used is determined by the number of antenna carriers to be used. Therefore, as shown in FIG. 26, when data transfer of the maximum number of antenna carriers is performed, there is no space in the IQ data block 22, but in the other case, as shown in FIG. there's a vacancy.

  By the way, a transmission line remedy system is known in which a spare transmission line is not provided separately and a transmission line in which a failure has occurred is relieved in a normally used transmission line. This transmission path relief method is a transmission system in which stations composed of a digital exchange and a carrier device are connected to each other via a transmission path. When a failure occurs in the transmission path, both the stations are connected to the digital exchange. A high-efficiency code conversion device interposed between the carrier and the carrier device detects the presence or absence of the trunk signal of the digital exchange and compresses the bandwidth of the detected trunk signal and frees the compressed trunk signal. By adding a call voice insertion function assigned to a channel of a transmission path, the number of communication paths is increased, and the faulty transmission path is relieved via another station (for example, Patent Document 1) reference.).

JP-A 61-224765 “Common Public Radio Interface”, [online], industrial cooperation group CPRI, [October 5, 2006 search], Internet <URL: http: // www. cpri. info / jp / press. html>

  However, in the conventional configuration described above, the CPRI link is independent for each wireless device unit, and there is no means for direct communication between the wireless device units. Therefore, when a CPRI link connected to the same radio control unit is disconnected, even if there is sufficient free line capacity in another CPRI link, the data of the broken CPRI link is transferred using the free line. Can not do it. Therefore, there is a problem that a sector under the broken CPRI link falls into a communication disabled state.

  In addition, the transmission line remedy method disclosed in Patent Document 1 is such that when a failure occurs in a transmission line between stations equipped with a digital exchange and a carrier device, the transmission line in the failure section is routed through another station. It is secured by a detour route. Therefore, it is not possible to relieve the CPRI link disconnection between the radio control unit and the radio device unit in the radio base station device by applying this rescue method or based on this rescue method.

  The present invention has been made in view of the above, and provides a radio base station apparatus, a radio apparatus, and a link break relief method that can relieve a CPRI link break in a radio base station apparatus using CPRI. With the goal.

  In order to solve the above-described problems and achieve the object, the present invention has the following features. The radio base station apparatus includes a radio control unit, a radio device unit, and a transfer unit between radio device units. The radio control unit synthesizes IQ data for different antenna carriers and transmits it to one CPRI link. Further, the radio control unit generates mapping information of the synthesized IQ data and transmits it to all the radio device units. The wireless device unit receives IQ composite data and mapping information thereof from the wireless control unit. Then, the radio apparatus unit decomposes the combined data into IQ data of each antenna carrier, and transmits each IQ data to itself or another radio apparatus unit based on the mapping information. The wireless device unit transfer means receives IQ data addressed to another wireless device unit from the wireless device unit, and transfers the IQ data to the corresponding other wireless device unit.

  According to the present invention, when one of the CPRI links is disconnected in a radio base station apparatus in which a plurality of radio apparatus units are connected to the radio control unit by CPRI links independent of each other, transmission is performed via the broken CPRI link. The IQ data that was supposed to be transmitted is combined with the IQ data transmitted through the other CPRI link that is not disconnected, and transmitted through the other CPRI link that is not disconnected. The transmitted IQ composite data is disassembled in the wireless device unit to which the CPRI link used for the transmission is connected. Then, the IQ data that should have been transmitted via the broken CPRI link is transferred to the wireless device unit to which the broken CPRI link is connected based on the mapping information of the combined data.

  The radio base station apparatus, the radio apparatus, and the link disconnection repair method in the radio base station apparatus according to the present invention have an effect that CPRI link disconnection in the radio base station apparatus using CPRI can be recovered.

FIG. 1 is a diagram showing a configuration of an embodiment of a radio base station apparatus according to the present invention. FIG. 2 is a diagram illustrating an example of the CPRI link state management table. FIG. 3 is a diagram illustrating an example of the IQ path management table. FIG. 4 is a diagram illustrating an example of the C & M path management table. FIG. 5 is a diagram illustrating an example of the cell priority table. FIG. 6 is a diagram showing an example of a bitmap on the IQ data block when IQ data of two sectors is accommodated. FIG. 7 is a diagram showing the IP address storage area of the vendor specific area. FIG. 8 is a diagram showing a flow of processing by the CPRI link disconnection relief method according to the present invention. FIG. 9 is a diagram showing a flow of processing by the CPRI link disconnection relief method according to the present invention. FIG. 10 is a diagram illustrating a data transmission state before disconnection of the CPRI link when there is free space in the CPRI link. FIG. 11 is a diagram illustrating a data transmission state after the CPRI link is disconnected in a state where the CPRI link has free space. FIG. 12 is a diagram illustrating a data transmission state before disconnection of the CPRI link when there is no free space in the CPRI link. FIG. 13 is a diagram showing a data transmission state after the CPRI link is disconnected when there is no free space in the CPRI link. FIG. 14 is a diagram illustrating a configuration of a conventional radio base station apparatus. FIG. 15 is a diagram showing an outline of a protocol defined by CPRI. FIG. 16 is a diagram illustrating an example of a signal format of the control and management information plane. FIG. 17 is a diagram illustrating an example of parameters of the control and management information plane. FIG. 18 is a diagram illustrating an example of parameters of the control and management information plane. FIG. 19 is a diagram illustrating an example of parameters of the control and management information plane. FIG. 20 is a diagram illustrating an example of parameters of the control and management information plane. FIG. 21 is a diagram illustrating an example of parameters of the control and management information plane. FIG. 22 is a diagram illustrating an example of parameters of the control and management information plane. FIG. 23 is a diagram illustrating an example of a bitmap on an IQ data block. FIG. 24 is a diagram illustrating an example of a bitmap on the IQ data block. FIG. 25 is a diagram illustrating an example of a bitmap on the IQ data block. FIG. 26 is a diagram illustrating an example of a bitmap on an IQ data block.

Explanation of symbols

Reference Signs List 41 Wireless base station device 42 Wireless control unit 43, 44, 45 Wireless device unit 46, 47, 48 CPRI link 49 Wireless device unit IQ switch 50 Wireless device unit C & M route 53 C & M route management table 54 Cell priority table 61, 63, 65 IQ switch 62, 64, 66 Radio section

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In the following description, when each wireless device unit is described separately, the wireless device unit # 1, the wireless device unit # 2, and the wireless device unit #n are used. The same applies to the CPRI link.

  FIG. 1 is a diagram showing a configuration of an embodiment of a radio base station apparatus according to the present invention. As shown in FIG. 1, the radio base station apparatus 41 is a radio having a function as a radio control unit 42, a plurality of radio apparatus units 43, 44, 45, CPRI links 46, 47, 48, and radio unit inter-unit transfer means. An inter-apparatus IQ switch 49 and an inter-radio apparatus section C & M path 50 having a function as an inter-radio apparatus section path are provided.

  The wireless control unit 42 controls the wireless communication monitoring by the wireless device units 43, 44, and 45. In addition, the radio control unit 42 has a function of combining IQ data for different antenna carriers and transmitting the synthesized IQ data to the same CPRI link. Further, the radio control unit 42 generates mapping information of the combined IQ data and transmits the mapping information to the radio device units 43, 44, and 45 via any CPRI link and the C & M path 50 between the radio devices. The mapping information is stored in the vendor specific (Vender Specific) area 32 (see FIG. 15) and transmitted. The radio control unit 42 includes a CPRI link status management table 51, an IQ path management table 52, a C & M path management table 53, and a cell priority table 54 in order to manage the communication status with the radio device units 43, 44, 45. ing.

  FIG. 2 is a diagram illustrating an example of the CPRI link state management table. In the CPRI link state management table 51, the numbers # 1, # 2, and #n are assigned to the CPRI links 46, 47, and 48 connected to the wireless device unit # 1_43, the wireless device unit # 2_44, and the wireless device unit # n_45, respectively. ing. The CPRI link state management table 51 includes a connection state between the wireless device unit # 1_43 and the CPRI link # 1_46, a connection state between the wireless device unit # 2_44 and the CPRI link # 2_47, and a connection state between the wireless device unit # n_45 and the CPRI link # n_48. Is a table for managing By referring to the CPRI link state management table 51, the radio control unit 42 can instantly know which CPRI link has been disconnected and which CPRI link has been disconnected.

  FIG. 3 is a diagram illustrating an example of the IQ path management table. The IQ path management table 52 is a table for managing which sector and which carrier information is stored in the IQ data storage area of each CPRI link 46, 47, 48. The wireless control unit 42 refers to the IQ path management table 52 to determine which CPRI link is used to exchange IQ data with each wireless device unit 43, 44, 45, and each CPRI link 46. , 47, and 48, whether or not there is a free IQ data storage area.

  FIG. 4 is a diagram illustrating an example of the C & M path management table. The C & M route management table 53 indicates which CPRI link a route (hereinafter referred to as a C & M route) for transmitting information of the control and management information plane 23 (see FIG. 15) passes through; It is a table which manages the IP address for transmitting the information of the control and management information plane 23 (refer FIG. 15) to each radio | wireless apparatus part 43,44,45. This IP address is stored in the vendor specific area 32 (see FIG. 15) and transmitted.

  The wireless control unit 42 allocates an IP address stored in the C & M path management table 53 to each wireless device unit 43, 44, 45. Therefore, the C & M path management table 53 has a function as an address supply unit. Further, the wireless control unit 42 refers to the C & M path management table 53, and which CPRI link should be used to send the information of the control and management information plane 23 (see FIG. 15) to the C & M path. That is, it is possible to know the destination IP address when sending the information. The wireless control unit 42 transfers the information of the control and management information plane 23 to the wireless device units 43, 44, and 45, so that the wireless control unit 42 can control IQ data of each sector on a cell basis. It becomes possible.

  FIG. 5 is a diagram illustrating an example of the cell priority table. The cell priority table 54 is a table for controlling the priority, the presence / absence of transmission diversity, and the presence / absence of reception diversity for each carrier of each sector. The radio control unit 42 can dynamically control the presence or absence of transmission diversity and the presence or absence of reception diversity for each carrier of each sector by changing the information stored in the cell priority table 54. Therefore, the cell priority table 54 functions as diversity control means.

  When the radio control unit 42 dynamically controls diversity, when a broken CPRI link is detoured, a data area in another CPRI link serving as a detour can be dynamically generated. . Further, the wireless control unit 42 can know the priority, the presence / absence of transmission diversity, and the presence / absence of reception diversity for each carrier of each sector by referring to the cell priority table 54.

  The wireless device units 43, 44, and 45 have an IQ digital signal transmission / reception function and an analog wireless function. As shown in FIG. 1, the wireless device units 43, 44, 45 are connected to the wireless control unit 42 via CPRI links 46, 47, 48 that are independent of each other. . The wireless device units 43, 44, 45 are connected to each other via a wireless device C & M path 50. Therefore, although not particularly illustrated, the wireless device units 43, 44, and 45 include an interface for connection to the C & M path 50 between the wireless device units.

  The wireless device units 43, 44, and 45 include wireless units 62, 64, and 66 that transmit and receive IQ data, and IQ switches 61, 63, and 65 that function as transfer destination switching units that switch IQ data routes. I have. The wireless device units 43, 44, and 45 receive IQ composite data, mapping information, and IP addresses from the wireless control unit 42 via the CPRI links 46, 47, and 48. Alternatively, when the CPRI link connected to the wireless device unit 43, 44, 45 is disconnected, the wireless device unit 43, 44, 45 receives the IQ data via the wireless device unit IQ switch 49 and passes the C & M path 50 between the wireless device units. Via the mapping information and IP address.

  Although not particularly illustrated, the wireless device units 43, 44, and 45 have an address setting unit, and set the received IP address as its own IP address. Based on this IP address, the wireless device units 43, 44, and 45 perform mapping information transmission / reception with other wireless device units. Further, the wireless device units 43, 44, and 45 decompose the combined data into IQ data of each antenna carrier based on the mapping information. And the radio | wireless apparatus part 43,44,45 switches the route of IQ switch 61,63,65 based on mapping information, transmits IQ data addressed to itself to its radio | wireless part 62,64,66, IQ data addressed to other wireless device units is transmitted to the wireless device unit IQ switch 49. When transmitting IQ data addressed to other wireless device units to the wireless device unit IQ switch 49, the wireless device units 43, 44, 45 set the route of the wireless device unit IQ switch 49.

  The wireless device unit IQ switch 49 is a switch for switching the route of IQ data, like the IQ switches 61, 63, 65. When the wireless device unit IQ switch 49 receives IQ data addressed to other wireless device units from the wireless device units 43, 44, 45, it transfers the IQ data to the corresponding wireless device unit. Here, general IQ switches can be used as the wireless device unit IQ switch 49 and the IQ switches 61, 63, 65.

  FIG. 6 is a diagram showing a bitmap on an IQ data block when IQ data of two sectors (indicated as S1 and S2 in the figure) is accommodated in an IQ data area of the same CPRI link as an example. In FIG. 6, “S1” and “S2” are attached to the four cells C1 to C4 and the four cells C5 to C8, respectively. It is stored in the vendor specific area 32 as information.

  FIG. 7 is a diagram showing an area in which the IP address of the vendor specific area is stored. As shown in FIG. 7, the ID number, IP address, MAC address, and the like of the wireless device unit are stored for each wireless device unit. Each wireless device unit acquires an IP address from information stored in the vendor specific area 32 based on its own ID number, and sets the IP address. By doing so, the C & M path 50 between radio | wireless apparatus parts is produced | generated between each radio | wireless apparatus part.

  Next, the CPRI link breakage relief method according to the present invention will be described. 8 and 9 are diagrams showing a flow of processing by the CPRI link disconnection relief method according to the present invention. Here, the radio base station apparatus includes a radio control unit, a radio device unit # 1, a radio device unit # *, a radio device unit #n, and an IQ switch between radio devices, and is connected to the radio device unit **. A case where the CPRI link is broken will be described.

  In a state where the CPRI link is established between the wireless control unit and the wireless device unit # 1, the wireless device unit ##, and the wireless device unit #n, the wireless control unit, as in the prior art, includes each wireless device unit # 1. Then, IQ data addressed to the respective device units is sent to the wireless device unit # * and the wireless device unit #n via the CPRI links connected thereto. Each wireless device unit # 1, wireless device unit **, and wireless device unit #n transmits IQ data from its own wireless unit to the mobile terminal in the corresponding sector. Each wireless device unit # 1, wireless device unit **, and wireless device unit #n receives IQ data from the mobile terminal of the corresponding sector by its own wireless unit, and connects the IQ data to each of them. The data is sent to the radio control unit via the CPRI link.

  In this state, when the CPRI link connected to the wireless device unit ** is disconnected, the wireless control unit detects the link disconnection of the wireless device unit ** from the CPRI link state management table (step S1). Next, the radio control unit refers to the IQ path management table and confirms the number of accommodated cells of the radio device unit ** (step S2). Further, the wireless control unit refers to the C & M route management table and confirms the route for transferring the information of the control and management information plane to the wireless device unit ## (step S3). Then, the wireless control unit determines whether or not the wireless device unit ## has a connection to another wireless device unit (step S4).

  If there is no connection to another wireless device unit (step S4: No), the detour processing is terminated. In this case, the CPRI link break is not remedied. On the other hand, when there is a connection to another wireless device unit (step S4: Yes), the wireless control unit transfers the information on the control and management information plane along the connection path to the other wireless device unit. The C & M route management table is changed so as to make the detour route (step S5). Along with this table update, the wireless device unit # 1 and the wireless device unit #n each set a detour for the C & M path (steps S21 and S22).

  Then, the wireless device unit # 1 passes the C & M path detour information to the wireless device unit **. The wireless device unit ** receives the detour information and sets the detour for the C & M route (step S23). Thereafter, the wireless device unit ** transmits / receives information of the control and management information plane via another wireless device unit, here, the wireless device unit # 1.

  On the other hand, after changing the C & M path management table in step S5, the radio control unit refers to the IQ path management table and confirms the number of empty IQ paths (step S6). Then, the radio control unit determines whether or not the number of empty IQ paths is larger than the number of cells accommodated in the radio device unit ## (step S7). If the number of empty IQ paths is larger (step S7: Yes), the wireless control unit sets the accommodation cell of the wireless device unit ** in the empty IQ storage location of each CPRI link (step S8).

  On the other hand, when the number of accommodated cells of the radio apparatus unit ** is larger (step S7: No), the radio control unit refers to the cell priority table and confirms the priority of the accommodated cell of the radio base station apparatus. Based on the presence or absence of diversity and priority, the number of cells to be repaired is determined, or empty spaces for the number of cells to be repaired are generated (step S9). Next, the radio control unit changes the IQ path management table to reflect the allocated cell allocation contents of the radio device unit ** (step S10). Next, the radio control unit adds IQ path management information (route information) to the vendor specific area, and sends the information to the radio device unit # 1 and the radio device unit #n (step S11).

  The wireless device unit # 1 and the wireless device unit #n receive IQ path management information (route information), and set their own IQ switches (steps S24 and S25). Then, the wireless device unit # 1 transfers IQ path management information (route information) to the wireless device unit **. The wireless device unit ** receives the IQ path management information (route information) and sets its own IQ switch (step S26). In addition, the wireless device unit # 1 transfers IQ path management information (route information) to the wireless device unit IQ switch. The wireless device unit IQ switch receives the IQ path management information (route information) and sets the IQ switch (step S27). In this way, the link disconnection relief process of the wireless device unit # * is completed.

  Next, with reference to FIG. 10 to FIG. 13, a specific description will be given of a case where when a CPRI link is disconnected, the accommodation cell of the disconnected CPRI link is relieved with another CPRI link. First, an example in which the accommodated cell of the broken CPRI link can be covered with the number of empty IQ paths will be described. FIG. 10 is a diagram illustrating a data transmission state before disconnection of the CPRI link when there is free space in the CPRI link.

  In the example illustrated in FIG. 10, the CPRI link to the wireless device unit # 1_43 has a configuration with diversity of two carriers. Therefore, IQ data 71 for four cells is stored in the IQ data block to the wireless device unit # 1_43, and there is a free capacity for four cells. The IQ switch (not shown) of the wireless device unit # 1_43 transfers the IQ data 71 for four cells to the wireless unit (not shown) in the wireless device unit # 1_43. The radio equipment unit # 1_43 transmits IQ data 74 for four cells from its radio unit (not shown) to the mobile terminal 12 in the sector 1_9.

  Further, the CPRI link to the wireless device unit # 2_44 has a configuration with no 4-carrier diversity. Therefore, IQ data 72 for four cells is stored in the IQ data block to the wireless device unit # 2_44, and there is a free capacity for four cells. The IQ switch (not shown) of the wireless device unit # 2_44 transfers IQ data 72 for four cells to the wireless unit (not shown) in the wireless device unit # 2_44. The radio equipment unit # 2_44 transmits IQ data 75 for four cells from its radio unit (not shown) to the mobile terminal 13 in the sector 2_10.

  Further, the CPRI link to the wireless device unit # n_45 has a configuration with diversity of 4 carriers. Therefore, IQ data 73 for 8 cells is stored in the IQ data block for the wireless device unit # n_45, and there is no free capacity. The IQ switch (not shown) of the wireless device unit # n_45 transfers the IQ data 73 for eight cells to the wireless unit (not shown) in the wireless device unit # n_45. The radio equipment unit # n_45 transmits IQ data 76 for 8 cells from its radio unit (not shown) to the mobile terminal 14 in the sector n_11.

  In this state, it is assumed that the CPRI link to the wireless device unit # 1_43 is disconnected. FIG. 11 is a diagram showing a data transmission state after the CPRI link is disconnected in this case. In the example illustrated in FIG. 11, the radio control unit 42 allocates the IQ data 71 for four cells to the radio device unit # 1_43 to the free capacity for four cells of the CPRI link to the radio device unit # 2_44. The wireless control unit 42 combines the IQ data 72 for four cells to the wireless device unit # 2_44 and the IQ data 77 for four cells to the wireless device unit # 1_43, and sends the synthesized data to the wireless device unit # 2_44.

  The IQ switch (not shown) of the wireless device section # 2_44 transfers the IQ data 72 for four cells addressed to itself to the wireless section (not shown) in the wireless device section # 2_44, and 4 switches to the wireless device section # 1_43. The IQ data 77 for the cell is transferred to the wireless device IQ switch (not shown). The radio equipment unit # 2_44 transmits IQ data 75 for four cells from its radio unit (not shown) to the mobile terminal 13 in the sector 2_10. The IQ switch between wireless devices transfers IQ data 78 for four cells addressed to the wireless device # 1_43 to the wireless device # 1_43.

  The IQ switch (not shown) of the wireless device unit # 1_43 transfers IQ data 78 for four cells to the wireless unit (not shown) in the wireless device unit # 1_43. The radio apparatus unit # 1_43 transmits IQ data 79 for four cells from its radio unit (not shown) to the mobile terminal 12 in the sector 1_9. The IQ data transmitted from the mobile terminal 12 in the sector 1_9 is sent to the radio control unit 42 along the reverse path. The wireless device unit # n_45 is the same as the state before the CPRI link to the wireless device unit # 1_43 is disconnected.

  Next, an example of a case where the accommodated cell of the broken CPRI link cannot be covered by the number of empty IQ paths will be described. FIG. 12 is a diagram illustrating a data transmission state before disconnection of the CPRI link when there is no free space in the CPRI link. In the example illustrated in FIG. 12, each CPRI link to the wireless device unit # 1_43, the wireless device unit # 2_44, and the wireless device unit # n_45 has a configuration with diversity of 4 carriers. Therefore, IQ data 81, 82, and 83 for 8 cells are stored in each IQ data block to the wireless device unit # 1_43, the wireless device unit # 2_44, and the wireless device unit # n_45, respectively. Absent.

  In this case, the wireless device unit # 1_43 transmits IQ data 84 for 8 cells from its own wireless unit (not shown) to the mobile terminal 12 in the sector 1_9. The radio equipment unit # 2_44 transmits IQ data 85 for 8 cells from its radio unit (not shown) to the mobile terminal 13 in the sector 2_10. The radio equipment unit # n_45 transmits IQ data 86 for 8 cells from its radio unit (not shown) to the mobile terminal 14 in the sector n_11.

  In this state, it is assumed that the CPRI link to the wireless device unit # 1_43 is disconnected. In this case, since there is no vacancy in all CPRI links, it is necessary to create a vacant line in the CPRI link by making unused cells having a low priority according to a preset cell priority. Then, the high-priority information for the wireless device unit # 1_43 is relieved using the generated empty line. Here, as an example of the priority order, the first and second carriers are given the highest priority for each sector, and the branch 1 side of the diversity configuration is given the lower priority.

  FIG. 13 is a diagram showing a data transmission state after the CPRI link is disconnected in this case. In the example shown in FIGS. 12 and 13, C 1 and C 2 are carrier 1, C 3 and C 4 are carrier 2, C 5 and C 6 are carrier 3, and C 7 and C 8 are carrier 4. C1, C3, C5, and C7 are branch 0 of each carrier, and C2, C4, C6, and C8 are branch 1 of each carrier. Accordingly, the priority relationship is [C1, C3, C5, C7]> [C2, C4]> [C6, C8].

  In the example illustrated in FIG. 13, the radio control unit 42 generates each idle radio channel in order to generate an empty line based on the configuration information and the priority order of the radio device unit # 1_43, the radio device unit # 2_44, and the radio device unit # n_45. The line configuration of the units 43, 44, and 45 is changed. In the case of the above-mentioned priority order, an empty line for four cells C1, C3, C5, and C7 to the wireless device unit # 1_43 is required. Therefore, the radio control unit 42 configures the radio device unit # 2_44 and the radio device unit # n_45 from the configuration with 4-carrier diversity, with diversity for the 1 and 2 carriers, and without diversity for the 3 and 4 carriers. Change to the configuration. Thereby, each CPRI link to the wireless device unit # 2_44 and the wireless device unit # n_45 has a free capacity for two cells.

  The radio control unit 42 allocates the IQ data for two cells to be relieved to the radio device unit # 1_43 to the free capacity for two cells of the CPRI link to the radio device unit # 2_44, and sends the IQ data to the radio device unit # 2_44. The IQ data 91 for 6 cells of C1 to C5 and C7 and the IQ data 92 for 2 cells of C1 and C3 to the wireless device unit # 1_43 are combined and sent to the wireless device unit # 2_44. Further, the radio control unit 42 allocates IQ data for another two cells to be relieved to the radio device unit # 1_43 to the free capacity for two cells of the CPRI link to the radio device unit # n_45, and the radio device unit The IQ data 93 for 6 cells of C1 to C5 and C7 to # n_45 and the IQ data 94 for 2 cells of C5 and C7 to the wireless device unit # 1_43 are combined and sent to the wireless device unit # n_45.

  The IQ switch (not shown) of the wireless device unit # n_45 transfers the IQ data 93 for 6 cells addressed to itself to the wireless unit (not shown) in the wireless device unit # n_45, and the 2 switches addressed to the wireless device unit # 1_43. The IQ data 94 for the cell is transferred to the wireless device unit IQ switch (not shown). The radio equipment unit # n_45 transmits IQ data 96 for six cells from its radio unit (not shown) to the mobile terminal 14 in the sector n_11. The IQ switch between wireless device units transfers IQ data 97 for two cells addressed to the wireless device unit # 1_43 to the wireless device unit # 1_43.

  The IQ switch (not shown) of the wireless device unit # 2_44 transfers the IQ data 91 for six cells addressed to itself to the wireless unit (not shown) in the wireless device unit # 2_44, and 2 is sent to the wireless device unit # 1_43. The IQ data 92 for the cell is transferred to the wireless device IQ switch (not shown). The radio equipment unit # 2_44 transmits IQ data 95 for 6 cells from its radio unit (not shown) to the mobile terminal 13 in the sector 2_10. The wireless device unit IQ switch includes two cells for the wireless device unit # 1_43 transferred from the wireless device unit # n_45 and two cells for the wireless device unit # 1_43 transferred from the wireless device unit # 2_44. The four cells of IQ data 98 are transferred to the wireless device unit # 1_43.

  The IQ switch (not shown) of the wireless device unit # 1_43 transfers IQ data 98 for four cells to the wireless unit (not shown) in the wireless device unit # 1_43. The radio equipment unit # 1_43 transmits IQ data 99 for four cells from its radio unit (not shown) to the mobile terminal 12 in the sector 1_9. The IQ data transmitted from the mobile terminal 12 in the sector 1_9 is sent to the radio control unit 42 along the reverse path.

  As described above, according to the embodiment, the IQ data that should have been transmitted through the broken CPRI link is transmitted by being combined with the IQ data of another CPRI link that has not been broken. It is possible to relieve the CPRI link break in the radio base station apparatus using the.

  As described above, the present invention is useful for a radio communication system, and is particularly suitable for a configuration using a CPRI link for connection in a radio base station apparatus.

Claims (4)

A radio base station apparatus having a plurality of radio apparatus units having an IQ digital signal transmission / reception function and an analog radio function, and a radio control unit for supervising and controlling radio communication by these radio apparatus units, each of which is independent of each other. In the radio base station apparatus connected to the radio control unit by the link in
A wireless control unit that combines IQ data for different antenna carriers and transmits the combined data to a link in the one wireless base station device, and generates mapping information of the combined IQ data and transmits the mapping information to the wireless device unit;
Receives IQ combined data and mapping information from the radio control unit, decomposes the combined data into IQ data of each antenna carrier, and transmits each IQ data to itself or another radio unit based on the mapping information A wireless device unit to
A wireless device unit path provided between a plurality of the wireless device units and transferring IQ data between the plurality of wireless device units;
The wireless control unit, characterized in that during cutting of the link, and transfers the IQ data of another wireless device portion destined from the radio device unit switches to the radio device section between paths to other wireless devices portion of the person A wireless base station device.   The radio base station apparatus according to claim 1, wherein the radio control unit further comprises diversity control means for dynamically controlling the presence / absence of transmission diversity and the presence / absence of reception diversity for each antenna carrier. The wireless control unit further includes address supply means for supplying address information for transmitting and receiving mapping information between the wireless device units to each wireless device unit,
The wireless device unit sets address information given from the wireless control unit, and transmits and receives mapping information between the wireless control unit and another wireless device unit according to the address information. The radio base station apparatus according to claim 1. A plurality of wireless device units having an IQ digital signal transmission / reception function and an analog wireless function; a path between wireless device units provided between the plurality of wireless device units for transferring IQ data between the plurality of wireless device units; One of the links in the radio base station apparatus that has a radio control section that controls radio communication monitoring control by the radio apparatus section, and in which each radio apparatus section is connected to the radio control section by a link in the radio base station apparatus independent of each other A link disconnection relief method in a radio base station apparatus when
  Combining IQ data for different antenna carriers and transmitting it to a link in one radio base station apparatus, generating mapping information of the combined IQ data and transmitting it to the radio apparatus unit;
  Receiving IQ combined data and mapping information, decomposing the combined data into IQ data of each antenna carrier, and transmitting each IQ data to itself or another radio device unit based on the mapping information;
  When the link is disconnected, the wireless control unit switches IQ data addressed to another wireless device unit from the wireless device unit to the corresponding other wireless device unit and transfers it to the path between the wireless device units. A link breakage relief method in a radio base station apparatus.

Images