JP2010278754A - Communication device and data mapping error detecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a communication device which detects a mapping error and carries out appropriate mapping for continuing normal communication. <P>SOLUTION: This communication device is provided with: a mapping part 5 for laying out a burst which is a rectangular area in a frequency direction and a time direction inside a zone which is a rectangular area in the frequency direction and the time direction obtained by dividing a frame of a length in a predetermined frequency direction and a length in a predetermined time direction on a two-dimensional area in the frequency direction and the time direction, so as to allocate downstream data or upstream data to the burst; and a mapping error detecting part 6 for detecting the mapping error, based on zone layout information indicating the layout of the zone and burst position information indicating the layout of the burst. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a communication apparatus and a data mapping error detection method in a communication system (for example, OFDMA (Orthogonal Frequency Division Multiple Access) system) that maps and transmits communication data in a frame composed of a two-dimensional region in a frequency direction and a time direction. .

  As a communication system using the OFDMA system, there is a WiMAX system that adopts a WiMAX (Worldwide Interoperability for Microwave Access) system shown as the IEEE 802.16 standard. In the following non-patent document reference, a mapping method for arranging communication data in a frame in the WiMAX system is defined.

IEEE “IEEE Std 802.16-2004”, 2004

  However, in the conventional WiMAX system, a communication data mapping method (data mapping) is shown, but a method for detecting a communication data mapping error is not shown. For this reason, there is a problem that there is a possibility that normal communication cannot be performed when there is an error in data mapping in the frame. In a real environment, it is assumed that a device compatible with WiMAX connects to a communication device that has not been certified by a certification organization such as WiMAX Forum, or when a malfunction of software or hardware occurs. In such a case, the data mapping into the frame may not be performed correctly.

  The present invention has been made in view of the above, and even when an error occurs in data mapping, an error is detected and an appropriate response for detecting the error and continuing normal communication is performed. An object of the present invention is to provide a communication device and a data mapping error detection method that can perform the above-described processing.

  In order to solve the above-described problems and achieve the object, the present invention provides a frame that is a region having a predetermined frequency direction length and a predetermined time direction length on a two-dimensional region in the frequency direction and the time direction. Is divided into zones that are rectangular regions in the frequency direction and the time direction, bursts that are rectangular regions in the frequency direction and the time direction are arranged in the zone, and data transmitted by the own device or received by the own device is received in the burst. Mapping means for assigning data; zone arrangement information indicating the arrangement of the zone in the frame; and burst position information indicating the arrangement of the burst in the frame; mapping error detection means for detecting a mapping error It is characterized by providing.

  According to the present invention, the mapping error detecting means determines whether or not the position of the allocated burst is within the zone to which the allocation is allocated to the burst based on the allocation information of the zone and the allocation information of the burst included in the allocation information. Since no error is detected and a mapping error is detected when a burst is not located in the zone, it is appropriate to detect an error and continue normal communication even if an error occurs in data mapping. The effect that it is possible to perform a proper response.

FIG. 1 is a diagram illustrating a functional configuration example of the communication apparatus according to the first embodiment. FIG. 2 is a diagram illustrating an example of an operation sequence between the Downlink scheduling unit or the Uplink scheduling unit, the mapping unit, and the mapping error detection unit. FIG. 3 is a diagram illustrating an example of a bandwidth allocation mapping method. FIG. 4 is a diagram illustrating an example of a data mapping method in a burst. FIG. 5 is a diagram illustrating an example of a burst arrangement including a mapping error. FIG. 6 is a diagram illustrating an example of a burst arrangement including a mapping error assumed in the second embodiment. FIG. 7 is a flowchart illustrating an example of a burst deletion procedure according to the second embodiment. FIG. 8 is a diagram illustrating an example of a burst arrangement including a mapping error assumed in the third embodiment. FIG. 9 is a diagram illustrating an example of a burst arrangement including a mapping error assumed in the fourth embodiment. FIG. 10 is a flowchart illustrating an example of a subburst deletion processing procedure according to the fourth embodiment. FIG. 11 is a diagram illustrating an example of a burst arrangement including a mapping error assumed in the fifth embodiment. FIG. 12 is a diagram illustrating an example of a burst arrangement including a mapping error assumed in the sixth embodiment.

  Embodiments of a communication apparatus and a data mapping error detection method 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.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a functional configuration example of a communication device according to a first embodiment of the present invention. The communication device 1 according to the present embodiment includes a network interface unit 2, a downlink scheduling unit 3, an uplink scheduling unit 4, a mapping unit 5, a mapping error detection unit 6, a reception unit 7, a transmission unit 8, And an antenna 9. The communication device 1 performs bidirectional communication with a plurality of terminals by a communication method (for example, OFDMA method) in which data is arranged and transmitted in a two-dimensional region in the frequency direction and the time direction.

  In the communication apparatus 1, the reception unit 7 performs a predetermined reception process on the data received by the antenna 9 and outputs the data to the Uplink scheduling unit 4. The Uplink scheduling unit 4 performs Uplink scheduling processing based on the data, and outputs the data to the network interface unit 2. The network interface unit 2 further performs predetermined interface processing on the data. Later, output to the network.

  Further, the network interface unit 2 performs predetermined interface processing on the data received from the network, and then outputs the data to the downlink scheduling unit 3. The Downlink scheduling unit 3 performs Downlink scheduling processing based on the data, outputs the data to the mapping unit 5, the mapping unit 5 maps the data, and maps the mapped data to a mapping error detection unit 6 is output. Then, the mapping error detection unit 6 performs error detection processing on the mapped data, and then outputs the data to the transmission unit 8. The transmission unit 8 performs predetermined transmission processing on the input data, and then transmits the data to the terminal via the antenna 9.

  FIG. 2 is a diagram illustrating an example of an operation sequence among the Downlink scheduling unit 3 or the Uplink scheduling unit 4, the mapping unit 5, and the mapping error detection unit 6. The operation of this embodiment will be described with reference to FIGS.

  The Downlink scheduling unit 3 determines the priority, modulation degree, and coding rate of downlink bandwidth allocation of each terminal as a scheduling process (step S11), and notifies the determination result to the mapping unit 5 (step S12). Note that the direction from the communication device 1 to the terminal is the downlink direction, and the direction from the terminal to the communication device 1 is the uplink direction. In addition, the uplink scheduling unit 4 determines the priority, the modulation degree, and the coding rate of uplink bandwidth allocation as the scheduling process (step S11), and notifies the determination result to the mapping unit 5 (step S12).

  The mapping unit 5 allocates downlink and uplink bands to each terminal based on the priority, modulation degree, and coding rate of each terminal notified from the Downlink scheduling unit 3 and the Uplink scheduling unit 4 (Step S13: Mapping). processing).

  FIG. 3 is a diagram illustrating an example of a bandwidth allocation (mapping) method performed by the mapping unit 5. The communication apparatus 1 according to the present embodiment performs transmission and reception with a rectangular area 10 in a predetermined range in the time direction and a predetermined range in the frequency direction as one unit. This rectangular area 10 is called a frame. One or more rectangular areas called zones are arranged in the frame. The size of the zone is arbitrary. The example of FIG. 3 shows an example in which three zones 11, 12, 13 (zones # 0, # 1, # 2) are arranged. In addition, bursts that are rectangular areas of any size are arranged in these zones 11, 12, and 13. In the example of FIG. 3, the burst 14 is arranged in the zone 12 (zone # 1), and the bursts 15 and 16 are arranged in the zone 13 (zone # 2). Note that the arrangement position and the number of bursts are not limited to this and may be any number.

  FIG. 4 is a diagram illustrating an example of a data mapping method in a burst. Divide the burst into one or more sub-bursts. In the example of FIG. 4, an example in which the sub-bursts 20, 21, and 22 are divided into three sub-bursts is shown, but the present invention is not limited to this, and any number of sub-bursts may be divided. A subburst is composed of one or more slots 30, 31, and 32 (minimum unit for bandwidth allocation), and the size of the subburst is determined by the number of slots constituting the subburst. The mapping unit 5 maps data in units of slots 30, 31, 32. The direction of data mapping is the direction indicated by the arrow in the figure, but it may be either the time direction or the frequency direction (the horizontal axis in the figure may be the frequency direction or the time direction).

  When the mapping unit 5 finishes the mapping process, the communication device 1 notifies each terminal of the mapping result as band allocation information of the downlink or uplink frame, and performs bidirectional communication. Here, a data sequence in which downlink frame bandwidth allocation information notified to each terminal is encoded is referred to as DL-MAP, and a data sequence in which uplink frame bandwidth allocation information is encoded is referred to as UL-MAP. DL-MAP and UL-MAP are notification information for notifying the terminal of band allocation information. The mapping unit 5 creates DL-MAP and UL-MAP based on the downlink bandwidth allocation information and the uplink bandwidth allocation information, respectively (step S14). Then, the mapping unit 5 notifies the mapping error detection unit 6 of the uplink band allocation information and DL-MAP, or the downlink band allocation information and UL-MAP (step S15).

  The mapping error detector 6 performs mapping based on a predetermined bandwidth allocation method (for example, the bandwidth allocation method shown in FIGS. 3 and 4) and the notified uplink bandwidth allocation information or downlink bandwidth allocation information. An error detection process is performed (step S16). As the mapping error detection process, first, a mapping error is detected based on a mapping error detection method described later. When an error is detected, an error log indicating the error location is stored, and band allocation information and Modify with DL-MAP or UL-MAP. Further, in the case of the downlink band allocation information, the mapping error detection unit 6 notifies the reception unit 7 of the corrected downlink band allocation information and DL-MAP, and the downlink scheduling unit 3 notifies the modification content of the downlink band allocation information. (Step S17). In addition, in the case of uplink band allocation, the corrected uplink band allocation information is notified to the transmission unit 8, the corrected UL-MAP is notified to the reception unit 7, and the correction contents of the uplink band allocation information are further notified. Notify the Uplink scheduling unit 4.

  The mapping error detection method of the mapping error detection unit 6 will be described below. FIG. 5 is a diagram illustrating an example of a burst arrangement including a mapping error when the bandwidth allocation method of FIG. 3 is used. In FIG. 5, the burst is arranged outside the area of zone # 1 where the confidence is arranged. In order to detect such an out-of-area arrangement, the mapping error detection unit 6 determines that the burst is outside the zone area based on the band allocation information (downlink allocation information or uplink band allocation information) notified from the mapping unit 5. It is determined whether it is placed in

  Specifically, the determination is as follows. The bandwidth allocation information includes a time direction offset (a value indicating a position in the time direction), a frequency direction offset (a value indicating a position in the frequency direction), a time direction length and a frequency direction length for each zone and each burst. The zone where the burst is arranged is included. Based on these pieces of information, the position of each vertex in the burst area is calculated, and it is confirmed that the position of each vertex is located in the zone area. It is assumed that the mapping error detection unit 6 holds information on the zone area of each zone based on a predetermined bandwidth allocation method. The mapping error detection unit 6 determines that a mapping error occurs when the apex of one of the burst areas is not located in the zone area where the burst is arranged (the burst area is outside the zone area). Leave a log. As the error log, for example, a memory dump of erroneous band allocation information is used. The method for determining whether or not each burst is located in the zone area may be implemented by other methods besides the vertex comparison.

  Further, when an error is detected after performing the error detection by the above-described mapping error detection method, the band allocation information is corrected as described above. As this correction method, for example, a burst in which an error is detected is deleted from the band allocation information, and the result of the deletion is used as corrected band allocation information. Notifies the transmission unit 8. Further, based on the corrected band allocation information, DL-MAP is corrected for downlink band allocation, and UL-MAP is corrected for uplink band allocation, and the reception unit 7 is notified. Then, the receiving unit 7 transmits the corrected UL-MAP to the terminal. In addition, the downlink scheduling unit 3 or the uplink scheduling unit that has notified the burst deletion is notified to the downlink scheduling unit 3 in the case of downlink bandwidth allocation, and to the uplink scheduling unit 4 in the case of uplink bandwidth allocation. 4 performs reallocation for the burst at the next and subsequent bandwidth allocation.

  In the present embodiment, the mapping error detection unit 6 performs both the function of detecting the mapping error and the function of correcting the location where the error has occurred. However, the present invention is not limited to this, and a mapping error is detected. Only the function to be performed may be realized. Then, using this detection result, normal communication can be continued by taking some measures to prevent communication abnormality due to incorrect assignment.

  As described above, in the present embodiment, the mapping error detection unit 6 determines whether or not the position of the allocated burst is within the zone based on the band allocation information and a predetermined band allocation method. If a mapping error is detected when no burst is located in the zone, the burst is deleted from the bandwidth allocation information, and the burst is reassigned at the next and subsequent bandwidth allocation. Therefore, even when an error occurs in the data mapping, the error can be detected and communication can be performed normally.

Embodiment 2. FIG.
Next, a mapping error detection method according to the second embodiment of the present invention will be described. The configuration of the communication apparatus according to the present embodiment is the same as that of the communication apparatus 1 according to the first embodiment. In the present embodiment, the bandwidth allocation method described with reference to FIGS. 3 and 4 is adopted. FIG. 6 is a diagram illustrating an example of a burst arrangement including a mapping error assumed in the present embodiment. As shown in FIG. 6, the areas of burst # 0 and burst # 1 overlap. In this embodiment, it is thus detected whether or not a plurality of burst areas overlap.

  Specifically, the mapping error detection unit 6 determines whether or not the burst regions overlap based on the band allocation information of each burst of the downlink and uplink frames notified from the mapping unit 5. The bandwidth allocation information of each burst is a time direction offset, a frequency direction offset, a time direction length, and a frequency direction length of each burst. Based on these pieces of information, the position of each vertex of each burst area is calculated, and duplication judgment of each burst area is performed. If any one of the burst areas overlaps, it is determined that a bandwidth allocation error has occurred and an error log is stored. The method for determining whether or not the burst areas overlap is not limited to this, and other methods may be used.

  Further, the mapping error detection unit 6 deletes some of the overlapping bursts from the band allocation information so that the burst areas do not overlap. For example, in the example of FIG. 6, one of burst # 0 and burst # 1 is deleted, and the band allocation information after deletion is used as the band allocation information after correction. Then, the mapping error detection unit 6 notifies the band allocation information to the reception unit 7 in the case of downlink band allocation after deletion, and notifies the transmission unit 8 of the band allocation information in the case of uplink band allocation.

  FIG. 7 is a flowchart illustrating an example of a burst deletion procedure according to the present embodiment. The mapping error detection unit 6 deletes some of the overlapping bursts so that the burst areas do not overlap. FIG. 7 shows an example of the deletion procedure at that time. First, the burst B1 having the largest number of overlapping other bursts is obtained based on the result of the burst region overlap determination of each burst (step S21). For example, it is assumed that burst # 1 has a region overlapping with burst # 2 and burst # 3, burst # 2 has a region overlapping with burst # 1, and burst # 3 has a region overlapping with burst # 1. In this case, the number of other overlapping bursts is two for burst # 1, one for burst # 2, and one for burst # 3. Therefore, the number of other overlapping bursts is the largest for burst #. 1

  Next, it is determined whether or not there are a plurality of B1 (step S22). If it is determined that a plurality of B1s are not present (No at Step S22), B1 is deleted from the bandwidth allocation information (Step S23). On the other hand, when it is determined that there are a plurality of B1 (Yes in step S22), the burst B2 having the largest burst area is obtained from B1 (step S24).

  Further, it is determined whether or not there are a plurality of B2 (step S25). If it is determined that a plurality of B2 does not exist (No in step S25), B2 is deleted from the bandwidth allocation information (step S26). On the other hand, when it is determined that there are a plurality of B2 (Yes in step S25), any one of B2 is selected, and the selected burst is deleted from the band allocation information (step S27).

  After the burst deletion in step S23, step S26 or step S27, it is determined whether or not there is an overlap in the burst area based on the band allocation information after deletion (step S28). If it is determined that there is no overlap in the burst area (No in step S28), the burst deletion process is terminated. If it is determined that there is an overlap in the burst area (Yes in step S28), the process returns to step S21 and subsequent processes. repeat.

  After the above burst deletion processing, based on the corrected band allocation information (band allocation information after burst deletion), UL-MAP is corrected for uplink band allocation and notified to the receiving unit 7. Further, the deleted burst is notified to the Downlink scheduling unit 3 in the case of downlink bandwidth allocation, and to the Uplink scheduling unit 4 in the case of uplink bandwidth allocation, and the received downlink scheduling unit 3 or the Uplink scheduling unit 4 receives the notification, At the time of bandwidth allocation after the next time, reallocation is performed for the deleted burst. The operations of the present embodiment other than those described above are the same as those of the first embodiment.

  In this embodiment, the mapping error is detected based on whether or not there is an overlap of burst areas. However, the same mapping error detection as in the first embodiment and the mapping error detection in this embodiment are detected. Both processes may be performed.

  As described above, in this embodiment, the mapping error detection unit 6 detects a mapping error by determining whether or not there is a duplication of burst areas based on the band allocation information. When a mapping error is detected, some of the overlapping bursts are deleted from the bandwidth allocation information so that the burst areas do not overlap. Therefore, even when a data mapping error such that the burst areas overlap is detected, the error can be detected and normal communication can be performed.

Embodiment 3 FIG.
Next, a mapping error detection method according to the third embodiment of the present invention will be described. The configuration of the communication apparatus according to the present embodiment is the same as that of the communication apparatus 1 according to the first embodiment. In the present embodiment, the bandwidth allocation method described with reference to FIGS. 3 and 4 is adopted. FIG. 8 is a diagram illustrating an example of a burst arrangement including a mapping error assumed in the present embodiment. In the example shown in FIG. 8, the amount of data stored in the sub-burst obtained based on the allocation result is larger than the data capacity that can be stored in the sub-burst (the number of slots set in the sub-burst, More slots are needed to store data).

In the present embodiment, the following processing is performed to deal with such a mapping error. The mapping error detection unit 6 determines whether the amount of data stored in the subburst is equal to or less than the amount of data that can be stored in the subburst based on the subburst setting information notified from the mapping unit 5. The subburst setting information is information including the number of subburst slots, the degree of modulation, the coding rate, the number of data symbols per slot, and the like. The amount of data that can be stored in the sub-burst is calculated according to the following equation (1), for example.
Amount of data that can be stored in sub-burst =
Number of sub-burst slots x modulation factor x coding rate x number of data symbols per slot
... (1)

  The mapping error detector 6 obtains the amount of data that can be stored in the subburst for each subburst, and obtains the amount of data that needs to be stored in the subburst for each subburst based on the band allocation information. Then, for each sub-burst, compare the amount of data that can be stored with the amount of data that needs to be stored, and for any sub-burst, if the amount of data that needs to be stored exceeds the amount of data that can be stored, Save the error log as mapping error.

  Further, the mapping error detection unit 6 deletes the sub-burst from the band allocation information to obtain corrected band allocation information. In the case of downlink band allocation, the mapping error detection unit 6 notifies the receiver 7 of the corrected band allocation information, In the case of allocation, the corrected band allocation information is notified to the transmission unit 8. Also, the mapping error detection unit 6 corrects the DL-MAP or UL-MAP based on the corrected band allocation information, and notifies the reception unit 7, which receives the DL-MAP or UL- notified to the terminal. Send MAP. Then, the mapping error detection unit 6 notifies the Downlink scheduling unit 3 that the sub-burst has been deleted in the case of downlink band allocation, and the received Downlink scheduling unit 3 or Uplink scheduling unit 4 At the time of allocation, reallocation is performed on the deleted subburst. The operations of the present embodiment other than those described above are the same as those of the first embodiment.

  In this embodiment, a mapping error is detected by determining whether or not the amount of data that needs to be stored for each sub-burst exceeds the amount of data that can be stored. You may make it perform both the mapping error detection of 1 or Embodiment 2, and the mapping error detection of this Embodiment. Furthermore, all of the mapping error detection of the first embodiment and the second embodiment and the mapping error detection of the present embodiment may be performed.

  As described above, in the present embodiment, the mapping error detection unit 6 determines whether or not the data amount that needs to be stored for each sub-burst exceeds the storable data amount, and the data that needs to be stored. When there is a sub-burst that exceeds the amount of data that can be stored, it is detected as a mapping error. Then, the sub-burst is deleted from the bandwidth allocation information. Therefore, even when a data mapping error occurs such that the amount of data that needs to be stored in the sub-burst exceeds the amount of data that can be stored in the sub-burst, the error can be detected and normal communication can be performed.

Embodiment 4 FIG.
Next, a mapping error detection method according to the fourth embodiment of the present invention will be described. The configuration of the communication apparatus according to the present embodiment is the same as that of the communication apparatus 1 according to the first embodiment. In the present embodiment, the bandwidth allocation method described with reference to FIGS. 3 and 4 is adopted. FIG. 9 is a diagram illustrating an example of a burst arrangement including a mapping error assumed in the present embodiment. In the example shown in FIG. 9, the total number of slots of each sub-burst in the burst is larger than the number of slots that can be stored in the burst.

  In the present embodiment, the following processing is performed to deal with such a mapping error. The mapping error detection unit 6 obtains the number of slots that can be stored in the burst based on the burst setting information and the number of sub-burst slots notified from the mapping unit 5, and the number of slots of each sub-burst set in the burst It is determined whether the total exceeds the number of slots that can be stored in the burst.

The burst setting information includes, for each burst, the burst time direction length and frequency direction length, and the slot time direction length and frequency direction length. Based on these pieces of information, the number of slots that can be stored in the burst is calculated according to the following equation (2), for example.
Number of slots that can be stored in a burst =
(Burst time direction length / Slot time direction length) × (Burst frequency direction length / Slot frequency direction length) (2)

  The number of sub-burst slots is the number of slots for each sub-burst used by mapping section 5 for mapping (bandwidth allocation). For each burst, the mapping error detection unit 6 obtains the total number of slots of each sub-burst constituting the burst (hereinafter referred to as the total number of sub-burst slots). Then, for each burst, the mapping error detection unit 6 compares the number of slots that can be stored in the burst with the total number of sub-bursts of the burst, and the total number of sub-burst slots determines the number of slots that can be stored in the burst. If there are more bursts, it is detected as a mapping error and an error log is saved.

  Further, some of the sub-bursts in the burst are deleted from the band allocation information so that the total number of sub-burst slots is equal to or less than the number of slots that can be stored in the burst, and the band allocation information after deletion is corrected. This is bandwidth allocation information. Then, the mapping error detection unit 6 notifies the corrected band allocation information to the receiving unit 7 in the case of downlink band allocation, and the corrected band allocation information to the transmission unit 8 in the case of uplink band allocation.

  The process of deleting the sub-burst from the bandwidth allocation information is performed by the following procedure, for example. FIG. 10 is a flowchart illustrating an example of a subburst deletion processing procedure according to the present embodiment. First, the mapping error detection unit 6 obtains the data amount to be stored in each sub-burst based on the band allocation information, and obtains the sub-burst SB1 having the smallest stored data amount in the burst (Step S31). Next, it is determined whether or not there are a plurality of sub-bursts SB1 having the smallest stored data amount (step S32). If there is only one SB1 (No in step S32), the sub-burst is deleted from the band allocation information (step S33).

  If there are a plurality of SB1s, sub-burst SB2 having the largest number of slots (the set number of slots) among SB1 is obtained (step S34), and it is further determined whether there are a plurality of SB2 (step S35). . If there is only one SB2 (No in step S35), the burst is deleted from the band allocation information (step S36). If there are a plurality of SB2s (step S35 Yes), any one of SB2 is selected and the selected sub-burst is deleted from the band allocation information (step S37). The selection method of the subburst in step S37 may be any selection method such as, for example, the first subburst found.

  Then, after the subburst is deleted in step S33, step S36, or step S37, it is determined whether the total number of subburst slots exceeds the number of slots that can be stored in the burst based on the band allocation information after deletion (step S31). S38) If the total number of sub-burst slots exceeds the number of slots that can be stored in the burst (step S38 Yes), the process returns to step S31 and the subsequent processing is repeated. If the total number of slots of each sub-burst is equal to or less than the number of slots that can be stored in the burst (No in step S38), the sub-burst deletion process ends.

  Further, the mapping error detection unit 6 corrects the DL-MAP or UL-MAP based on the corrected band allocation information and notifies the reception unit 7, and the reception unit 7 notifies the DL-MAP or UL- notified to the terminal. Send MAP. Further, the mapping error detection unit 6 notifies the downlink scheduling unit 3 in the case of downlink bandwidth allocation and the uplink scheduling unit 4 in the case of uplink bandwidth allocation, and notifies the downlink link that has received the notification. The scheduling unit 3 or the Uplink scheduling unit 4 performs reassignment on the deleted sub-burst at the next and subsequent bandwidth assignments. The operations of the present embodiment other than those described above are the same as those of the first embodiment.

  In this embodiment, the mapping error is detected by determining whether the total number of slots of each sub-burst in the burst does not exceed the number of slots that can be stored in the burst. The mapping error detection of this embodiment may be performed in addition to any one or more mapping error detections of 1 to Embodiment 3.

  As described above, in this embodiment, the mapping error detection unit 6 determines whether the total number of slots of each sub-burst in the burst exceeds the number of slots that can be stored in the burst, and each sub-burst in the burst is determined. A mapping error is detected when there is a burst whose total number of slots exceeds the number of slots that can be stored in the burst. Then, some of the sub-bursts in the burst are deleted from the band allocation information so that the total number of slots of each sub-burst in the burst is equal to or less than the number of slots that can be stored in the burst. Therefore, even if a data mapping error occurs such that the total number of slots of each sub-burst in the burst exceeds the number of slots that can be stored in the burst, the error can be detected and normal communication can be performed.

Embodiment 5 FIG.
Next, a mapping error detection method according to the fifth embodiment of the present invention will be described. The configuration of the communication apparatus according to the present embodiment is the same as that of the communication apparatus 1 according to the first embodiment. In the present embodiment, the bandwidth allocation method described with reference to FIGS. 3 and 4 is adopted. FIG. 11 is a diagram illustrating an example of a burst arrangement including a mapping error assumed in the present embodiment. In the example shown in FIG. 11, unused slots in which no data is stored are generated in the subburst.

In the present embodiment, the following processing is performed to deal with such a mapping error. The mapping error detection unit 6 compares the number of slots of the subburst with the number of slots necessary for the amount of data stored in the subburst based on the subburst information notified from the mapping unit 5 and determines whether the unused slot Determine if it has occurred. The subburst information includes, for example, the number of subburst slots (the number of slots set at the time of allocation), the amount of data stored in the subburst, the modulation factor, the coding rate, and the number of data symbols per slot. To do. The number of slots required for the amount of data stored in the sub-burst (hereinafter referred to as the required number of slots) is calculated according to the following formula (3), for example. However, [x] represents the maximum integer not exceeding x.
Required number of slots =
[Amount of data stored in sub-burst /
(Modulation degree × coding rate × number of data symbols per slot)] (3)

  Then, the mapping error detection unit 6 compares the required slot number with the set slot number for each sub-burst, and an unused slot is generated in any sub-burst (the required slot number is set). If it is less than the number of slots), it is detected as a mapping error and the error log is saved. Furthermore, the number of slots of the corresponding subburst in the bandwidth allocation information is replaced with the required number of slots of the subburst, the replaced bandwidth allocation information is used as the modified bandwidth allocation information, and in the case of downlink bandwidth allocation, the bandwidth allocation information is received. In the case of uplink bandwidth allocation, the bandwidth allocation information is notified to the transmitter 7 respectively. Also, the DL-MAP or UL-MAP is corrected based on the corrected band allocation information and notified to the receiving unit 7, and the receiving unit 7 transmits the DL-MAP or UL-MAP notified to the terminal. The operations of the present embodiment other than those described above are the same as those of the first embodiment.

  In this embodiment, a mapping error is detected by determining whether or not an unused slot in which data is not stored is generated in the sub-burst. In addition to detecting any one or more of the four mapping errors, the mapping error detection of this embodiment may be performed.

  As described above, in this embodiment, the mapping error detection unit 6 determines whether or not an unused slot in which no data is stored is generated in the sub-burst, and the unused state in which no data is stored in the sub-burst. When a slot is generated, it is detected as a mapping error. Then, the number of sub-burst slots in which unused slots in which no data is stored in the sub-burst of the bandwidth allocation information is changed to the required number of slots. Therefore, even when an error in data mapping occurs in which an unused slot in which no data is stored is generated in the sub-burst, it is possible to perform communication normally by detecting the error.

Embodiment 6 FIG.
Next, a mapping error detection method according to the sixth embodiment of the present invention will be described. The configuration of the communication apparatus according to the present embodiment is the same as that of the communication apparatus 1 according to the first embodiment. In the present embodiment, the bandwidth allocation method described with reference to FIGS. 3 and 4 is adopted. FIG. 12 is a diagram illustrating an example of a burst arrangement including a mapping error assumed in the present embodiment. In the example shown in FIG. 12, the total number of slots of each sub-burst set in the burst is smaller than the number of slots that can be stored in the burst, and the number of slots on one side of the burst data mapping direction (vertical direction in FIG. 12). The above unused slots are generated.

  In the present embodiment, the following processing is performed to deal with such a mapping error. Based on the downlink and uplink frame burst setting information and the number of sub-burst slots (number of slots set for each sub-burst) notified from the mapping unit 5, the mapping error detection unit 6 And the total number of slots of each sub-burst set in the burst (hereinafter referred to as the total number of slots in the burst), and subtract the total number of slots in the burst from the number of slots that can be stored in the burst. Based on this, free space is obtained. Then, when the free area is equal to or greater than a predetermined threshold number, it is detected as a mapping error. The burst setting information includes, for each burst, the burst time direction length and frequency direction length, the slot time direction length and the frequency direction length.

Specifically, for example, a mapping error is detected as follows. First, based on the burst setting information, for example, the number of slots that can be stored in the burst is calculated according to the following equation (4).
Number of slots that can be stored in a burst =
(Burst time direction length × Burst frequency direction length) / (Slot time direction length × Slot frequency direction length) (4)

Further, the number of slots on one side in the data mapping direction of the burst is calculated according to the following equation (5), for example.
When the mapping direction is the frequency direction:
Number of slots on one side of burst data mapping direction = length of burst frequency direction / length of slot frequency direction When mapping direction is time direction:
Number of slots in one side of burst data mapping direction = length of burst in time direction / length of slot in time direction (5)

Also, the total number of slots in the burst is calculated based on the number of slots in the sub-burst. For each burst, find the number of slots that can be stored in the burst and the total number of slots in the burst, and for any burst, subtract the total number of slots in the burst from the number of slots that can be stored in the burst. Asking. Then, based on the number of unused slots, for example, the number of empty burst areas is calculated according to the following equation (6).
Number of empty burst areas = [number of unused slots / number of slots on one side of burst mapping direction] (6)

  When the number of empty burst areas is greater than or equal to a preset threshold value (for example, 1), an error log is stored as a mapping error. Furthermore, the length of the band allocation information in the direction orthogonal to the data mapping direction (for example, the length in the time direction when the mapping direction is the frequency direction) is the length of the slot in that direction. Correct the minute (number of empty burst areas x slot length in that direction). Then, the mapping error detection unit 6 notifies the corrected band allocation information to the receiving unit 7 in the case of downlink band allocation, and notifies the transmitting unit 8 of the corrected band allocation information in the case of uplink band allocation. Also, the DL-MAP or UL-MAP is corrected based on the corrected band allocation information and notified to the receiving unit 7, and the receiving unit 7 transmits the DL-MAP or UL-MAP notified to the terminal. The operations of the present embodiment other than those described above are the same as those of the first embodiment.

  In this embodiment, the mapping error is detected using the number of empty burst areas that is an integer value. However, the present invention is not limited to this, and a threshold value for the number of unused slots is set. A mapping error may be detected when the number of slots used exceeds a predetermined threshold.

  In the present embodiment, a mapping error is detected by determining whether or not the number of free burst areas is equal to or greater than a predetermined threshold. However, in the first to fifth embodiments, the mapping error is detected. In addition to detecting any one or more mapping errors, the mapping error detection according to the present embodiment may be performed.

As described above, in the present embodiment, the mapping error detection unit 6 determines whether or not the number of empty burst areas (the number of unused slots with one side in the burst data mapping direction as a unit) is equal to or greater than a predetermined threshold value. Whether or not it is equal to or greater than a predetermined threshold is detected as a mapping error. Then, the length in the direction orthogonal to the data mapping direction of the band allocation information is corrected to be shorter by the number of empty burst areas. Therefore, even when an error in data mapping occurs that causes an unused slot having one or more sides in the data mapping direction of the burst, it is possible to detect the error and perform communication normally.

Embodiment 7 FIG.
Next, a mapping error detection method according to the seventh embodiment of the present invention will be described. The configuration of the communication apparatus according to the present embodiment is the same as that of the communication apparatus 1 according to the first embodiment. In the present embodiment, the mapping error detection unit 6 confirms the consistency between the downlink band allocation information and the DL-MAP based on the downlink band allocation information and the DL-MAP notified from the mapping unit 5. First, the DL-MAP data sequence is decoded, and each of the DL-MAP zone setting information, burst setting information, sub-burst setting information, and zone setting information, burst setting information, and sub-burst setting information of downlink bandwidth allocation information Consistency is confirmed by comparing corresponding items.

  The zone setting information is, for example, a time direction offset, a frequency direction offset, a time direction length, and a frequency direction length of each zone. The burst setting information is, for example, a time direction offset, a frequency direction offset, a time direction length, and a frequency direction length of each burst. The subburst setting information is, for example, the number of slots of each subburst, the modulation degree, the coding rate, the amount of stored data, and the like. As a result of the consistency check, if the consistency is not obtained (downlink allocation information and DL-MAP information do not match), the mapping error detection unit 6 sets a mapping error and stores an error log. Further, the DL-MAP is corrected based on the downlink band allocation information, and the corrected DL-MAP is notified to the receiving unit 7 and transmitted. In addition, it notifies the receiving unit 7 of downlink band allocation information. The operations of the present embodiment other than those described above are the same as those of the first embodiment.

  In the present embodiment, the mapping error is detected by confirming the consistency between the downlink bandwidth allocation information and the DL-MAP. However, any one or more of the first to sixth embodiments may be used. In addition to the mapping error detection, the mapping error detection according to this embodiment may be performed.

  As described above, in the present embodiment, the consistency between the downlink band allocation information and the DL-MAP is confirmed, and when it does not match, it is detected as a mapping error. And DL-MAP was corrected based on downlink band allocation information. Therefore, even when a data mapping error occurs such that the downlink bandwidth allocation information does not match the DL-MAP information, the error can be detected and normal communication can be performed.

Embodiment 8 FIG.
Next, a mapping error detection method according to the eighth embodiment of the present invention will be described. The configuration of the communication apparatus according to the present embodiment is the same as that of the communication apparatus 1 according to the first embodiment. In the present embodiment, the mapping error detection unit 6 uses the mapping error detection unit 6 based on the uplink band allocation information and the UL-MAP notified from the mapping unit 5 to match the uplink band allocation information with the UL-MAP. Confirm. First, the UL-MAP data sequence is decoded, and each of the UL-MAP zone setting information, burst setting information, sub-burst setting information, and zone setting information, burst setting information, and sub-burst setting information of downlink bandwidth allocation information Consistency is confirmed by comparing corresponding items.

  As a result of the consistency check, the mapping error detection unit 6 sets a mapping error and stores an error log when the consistency is not achieved (uplink bandwidth allocation information and UL-MAP information do not match). Further, the UL-MAP is corrected based on the uplink bandwidth allocation information, and the corrected UL-MAP is notified to the receiving unit 7 and transmitted. In addition, the uplink band allocation information is notified to the transmission unit 8. The operations of the present embodiment other than those described above are the same as those of the first embodiment.

  In the present embodiment, the mapping error is detected by confirming the consistency between the uplink bandwidth allocation information and the UL-MAP. However, any one or more of the first to seventh embodiments may be used. In addition to the mapping error detection, the mapping error detection according to this embodiment may be performed.

  As described above, in the present embodiment, the consistency between the uplink bandwidth allocation information and the UL-MAP is confirmed, and when it does not match, it is detected as a mapping error. Then, the UL-MAP is corrected based on the uplink bandwidth allocation information. Therefore, even when a data mapping error occurs such that the uplink bandwidth allocation information does not match the UL-MAP information, the error can be detected and normal communication can be performed.

Embodiment 9 FIG.
Next, a mapping error detection method according to the ninth embodiment of the present invention will be described. The configuration of the communication apparatus according to the present embodiment is the same as that of the communication apparatus 1 according to the first embodiment. In the present embodiment, the mapping unit 5 numbers the downlink and uplink frames, and notifies the mapping error detection unit 6 of the frame number together with the downlink and uplink band allocation information. The mapping error detection unit 6 holds the previously notified downlink and uplink frame numbers, and confirms that the newly notified frame number is continuous with the previously held frame number. If it is not continuous, the mapping assignment error is assumed and the error log is saved. The operations of the present embodiment other than those described above are the same as those of the first embodiment.

  In the present embodiment, the mapping error detection unit 6 detects the mapping error by confirming the continuity of the downlink and uplink frame numbers, but any one of the first to eighth embodiments. In addition to the above mapping error detection, the mapping error detection according to the present embodiment may be performed.

  In the present embodiment, the mapping unit 5 assigns numbers to the downlink and uplink frames, and the mapping error detection unit 6 confirms the continuity of the downlink and uplink frame numbers. Detected as an error. For this reason, even when an error occurs in data mapping such that the frame numbers do not continue, it is possible to perform communication normally by detecting the error.

  As described above, the communication device and the data mapping error detection method according to the present invention are useful for a communication system that employs a communication method in which communication data is mapped and transmitted in a frame composed of a two-dimensional region in the frequency direction and the time direction. In particular, it is suitable for a communication system that requires stable communication.

DESCRIPTION OF SYMBOLS 1 Communication apparatus 2 Network interface part 3 Downlink scheduling part 4 Uplink scheduling part 5 Mapping part 6 Mapping error detection part 7 Receiving part 8 Transmitting part 9 Antenna 10 Rectangular area 11, 12, 13 Zone 14, 15, 16 Burst 20, 21, 22 sub-burst 30, 31, 32 slots

Claims (19)

A frame that is a region having a predetermined frequency direction length and a predetermined time direction length on a two-dimensional region in the frequency direction and the time direction is divided into zones that are rectangular regions in the frequency direction and the time direction; Mapping means for arranging a burst that is a rectangular region in the frequency direction and the time direction in the inside, and assigning data transmitted by the own device or data received by the own device to the burst;
Mapping error detection means for detecting a mapping error based on zone arrangement information indicating an arrangement of the zone in the frame and burst position information indicating an arrangement of the burst in the frame;
A communication apparatus comprising: The mapping error detection means determines that a mapping error has been detected in the burst when the area of the burst includes an area outside the zone where the burst is arranged.
The communication apparatus according to claim 1. The assignment result assigned by the mapping means is assigned information,
When the mapping error detection unit detects a mapping error, the mapping unit deletes the allocation result related to the burst in which the error is detected from the allocation information, and the mapping unit reallocates the burst at the next data allocation. I do,
The communication device according to claim 2. The mapping error detection means determines that a mapping error has been detected when a plurality of burst areas overlap between the bursts;
The communication apparatus according to claim 1 or 2, wherein The result assigned by the mapping means is assigned information,
When the mapping error detection unit detects a mapping error, the mapping error detection unit selects one or more bursts among the bursts having overlapping regions as deletion targets so that the regions of each burst do not overlap, and an allocation result regarding the selected bursts From the allocation information, and the mapping means reallocates the selected burst at the time of next data allocation.
The communication apparatus according to claim 4. A slot having a predetermined area on a two-dimensional area in the frequency direction and the time direction is defined as a minimum unit of data allocation, and a frame having a predetermined frequency direction length and a predetermined time direction length is defined as a frequency direction. Dividing into zones that are rectangular regions in the time direction, placing bursts that are rectangular regions in the frequency direction and the time direction in the zone, dividing the bursts into sub-bursts each composed of one or more slots, Mapping means for assigning data to the sub-burst;
Data amount that is necessary for obtaining the number of slots required to store the data amount based on the data amount from the mapping means, and is allocated to each sub-burst for each sub-burst Based on the data information, the required number of slots, which is the number of slots required to store the data amount, is obtained, and based on the number of slots constituting the subburst and the required number of slots corresponding to the subburst. Mapping error detection means for detecting a mapping error;
A communication apparatus comprising: The mapping error detecting means compares the number of required slots with the number of slots constituting the subburst for each subburst, and if the required number of slots does not match the number of slots constituting the subburst, Determine that a mapping error has been detected,
The communication apparatus according to claim 6. The mapping error detection means determines that a mapping error has been detected in the sub-burst when there is a sub-burst in which the required number of slots exceeds the number of slots constituting the sub-burst;
The communication apparatus according to claim 7. The mapping error detection means determines that a mapping error has been detected in the sub-burst when there is a sub-burst in which the required number of slots is less than the number of slots constituting the sub-burst;
The communication apparatus according to claim 7. The mapping error detection means, when there is a subburst in which the required number of slots is less than the number of slots constituting the subburst more than the number of slots in one of the frequency direction and time direction constituting the burst, Determine that a mapping error has been detected in the burst,
The communication apparatus according to claim 9. The result assigned by the mapping means is assigned information,
When the mapping error detecting unit detects a mapping error, the mapping error detecting unit deletes the allocation result related to the sub-burst in which the mapping error is detected from the allocation information, and the mapping unit performs the sub-burst at the next data allocation. Reassign to
The communication device according to any one of claims 6 to 10, wherein The mapping means generates notification information that is information for notifying the communication partner apparatus of the allocation result based on the result of data allocation,
The mapping error detection means compares the value of the same item included in the allocation result and the notification information, and determines that a mapping error has been detected when there is an item whose comparison result does not match,
The communication apparatus according to any one of claims 1 to 11, wherein: A frame that is a region having a predetermined frequency direction length and a predetermined time direction length on a two-dimensional region in the frequency direction and the time direction is divided into zones that are rectangular regions in the frequency direction and the time direction; A burst which is a rectangular region in the frequency direction and the time direction is arranged in the data, and the data transmitted by the own device or the data received by the own device is assigned to the burst, and based on the assignment, Mapping means for generating notification information which is information for notifying the allocation result;
A mapping error detection means for comparing the value of the same item included in the allocation result and the notification information, and determining that a mapping error has been detected when there is an item whose comparison result does not match;
A communication apparatus comprising: The mapping means attaches consecutive numbers to a frame to which data transmitted by the own device is assigned and a frame to which data received by the own device is assigned, respectively.
The mapping error detection means detects a mapping error when the number is not consecutive for a frame to which data transmitted by the own device is allocated or when the number is not consecutive for a frame to which data received by the own device is allocated. Judge that
The communication apparatus according to claim 1, wherein A frame that is a region having a predetermined frequency direction length and a predetermined time direction length on a two-dimensional region in the frequency direction and the time direction is divided into zones that are rectangular regions in the frequency direction and the time direction; A burst that is a rectangular area in the frequency direction and the time direction is placed in the frame, and the data transmitted by the own device or the data received by the own device is assigned to the burst, and the frame to which the data transmitted by the own device is assigned, and Mapping means for assigning consecutive numbers to the frames to which the data received by the device is assigned;
Mapping error detection for determining that a mapping error has been detected when the number is not consecutive for a frame to which data transmitted by the own device is assigned or when the number is not consecutive for a frame to which data to be received by the own device is assigned Means,
A communication apparatus comprising: A frame that is a region having a predetermined frequency direction length and a predetermined time direction length on a two-dimensional region in the frequency direction and the time direction is divided into zones that are rectangular regions in the frequency direction and the time direction; A mapping step in which a burst that is a rectangular region in a frequency direction and a time direction is placed in, and data transmitted by the own device or data received by the own device is allocated to the burst;
A mapping error detection step for detecting a mapping error based on zone arrangement information indicating an arrangement of the zone in the frame and burst position information indicating an arrangement of the burst in the frame;
A data mapping error detection method comprising: A slot having a predetermined area on a two-dimensional area in the frequency direction and the time direction is defined as a minimum unit of data allocation, and a frame having a predetermined frequency direction length and a predetermined time direction length is defined as a frequency direction. Dividing into zones that are rectangular regions in the time direction, placing bursts that are rectangular regions in the frequency direction and the time direction in the zone, dividing the bursts into sub-bursts each composed of one or more slots, Mapping step of assigning data to the sub-burst;
Data amount that is necessary for obtaining the number of slots required to store the data amount based on the data amount from the mapping means, and is allocated to each sub-burst for each sub-burst Based on the data information, the required number of slots, which is the number of slots required to store the amount of data, is obtained, and based on the number of slots constituting the subburst and the required number of slots corresponding to the subburst. A mapping error detection step for detecting a mapping error;
A data mapping error detection method comprising: A frame that is a region having a predetermined frequency direction length and a predetermined time direction length on a two-dimensional region in the frequency direction and the time direction is divided into zones that are rectangular regions in the frequency direction and the time direction; A burst which is a rectangular region in the frequency direction and the time direction is arranged in the data, and the data transmitted by the own device or the data received by the own device is assigned to the burst, and based on the assignment, A mapping step for generating notification information which is information for notifying the allocation result;
A mapping error detection step of comparing the value of the same item included in the allocation result and the notification information, and determining that a mapping error is detected when there is an item whose comparison result does not match,
A data mapping error detection method comprising: A frame that is a region having a predetermined frequency direction length and a predetermined time direction length on a two-dimensional region in the frequency direction and the time direction is divided into zones that are rectangular regions in the frequency direction and the time direction; A burst that is a rectangular area in the frequency direction and the time direction is placed in the frame, and the data transmitted by the own device or the data received by the own device is assigned to the burst, and the frame to which the data transmitted by the own device is assigned, and A mapping step for assigning consecutive numbers to frames to which data received by the device is allocated;
Mapping error detection for determining that a mapping error has been detected when the number is not consecutive for a frame to which data transmitted by the own device is assigned or when the number is not consecutive for a frame to which data to be received by the own device is assigned Steps,
A data mapping error detection method comprising:

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