JP2016039432A - User device and capability information reporting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for a user device to report carrier aggregation-enabled combinations of frequency bands to a base station.SOLUTION: An aspect of the present invention relates to a user device with a carrier aggregation function. The user device includes: a communication control unit for controlling radio communication with a base station; a capability information management unit for managing carrier aggregation-enabled combinations of frequency bands supported by the user device; and a capability information report unit for reporting each carrier aggregation-enabled combination of frequency bands to the base station according to the report order related to the number of uplink component carriers or the number of downlink component carriers.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a wireless communication system.

  Currently, LTE-Advanced is being developed as a next-generation communication standard for the LTE system, and specifications for higher functionality are being developed. In the LTE-Advanced system, carrier aggregation (CA) technology is introduced in order to achieve a throughput higher than that of the LTE system while ensuring backward compatibility with the LTE system. In carrier aggregation, a component carrier (CC) having a maximum bandwidth of 20 MHz supported by the LTE system is used as a basic component, and by using these multiple component carriers at the same time, wider bandwidth communication is realized. It is planned to do.

  In carrier aggregation, a user apparatus (User Equipment: UE) can communicate with a base station (evolved NodeB: eNB) using a plurality of component carriers simultaneously. In carrier aggregation, a highly reliable primary cell (Primary Cell: PCell) that ensures connectivity with user equipment and a secondary cell (Secondary Cell: SCell) additionally set in the user equipment connected to the primary cell Is set. The primary cell is a cell similar to the serving cell of the LTE system, and is a cell for ensuring connectivity between the user apparatus and the network. On the other hand, the secondary cell is a cell that is added to the primary cell and set in the user apparatus.

  In the specification of LTE Release 10 (Rel-10), the user apparatus can report a maximum of 128 combinations of frequency bands that can be carrier-aggregated to the base station as UE capability information (UE Capability). To date, more than 70 combinations of frequency bands capable of carrier aggregation have been specified, and are expected to continue to increase in the future. This may cause the user device to exceed the 128 maximum number that can be reported.

  As described above, assuming that the user apparatus supports a combination of 128 or more frequency bands that can be carrier-aggregated, the base station designates a specific frequency band and can perform carrier aggregation in the designated frequency band. A mechanism for reporting a combination of the above to the user apparatus is defined from the specification of Rel-12. The specification stipulates that the user apparatus reports a combination of frequency bands that can be carrier-aggregated to the base station in the following priority order.

  That is, first, the user apparatus first reports a frequency band to be supported to the base station in a state where carrier aggregation is not applied (priority 1).

  Second, the user apparatus uses a combination (2DL + 1UL) of two downlinks (2DL) and one uplink (1UL) configured only by a frequency band that can be carrier-aggregated designated by the base station as a base station. Report (priority level 2).

  Third, the user apparatus reports to the base station a combination of other 2DL + 1UL frequency bands that can be carrier-aggregated (priority level 3).

  Fourth, the user apparatus reports other combinations of frequency bands capable of carrier aggregation to the base station (priority 4).

3GPP R2-142894 3GPP R2-142896

  When the user apparatus reports a combination of frequency bands that can be carrier-aggregated according to the above-described priority, the user apparatus uses a combination of frequency bands other than 2DL + 1UL that can be carrier-aggregated at priority 4 (for example, 2DL + 2UL, 3DL + 1UL, 3DL + 2UL, etc.) To the base station.

  However, as shown in FIG. 1, it is specified that the 2DL + 1UL frequency band combination capable of carrier aggregation is reported to the base station by the above-described priorities 2 and 3, whereas it is reported by the priority 4 It is currently not defined in which order each combination of frequency bands other than 2DL + 1UL and capable of carrier aggregation is reported to the base station.

  In addition, when the user apparatus reports all combinations of frequency bands that can be carrier-aggregated to the base station, the signaling size of the UE capability information increases. In this case, since a base station and MME (Mobility Management Entity) hold UE capability information of each user apparatus connected to the network, it is necessary to secure a large memory capacity for the base station and the MME.

  In view of the problems described above, an object of the present invention is to provide a technique for reporting, to a base station, each combination of frequency bands in which a user apparatus can perform carrier aggregation.

  In order to solve the above-described problem, an embodiment of the present invention is a user apparatus having a carrier aggregation function, which includes a communication control unit that controls wireless communication with a base station, and carrier aggregation supported by the user apparatus. Reports each combination of frequency bands that can be carrier-aggregated to the base station in accordance with a capability information management unit that manages combinations of frequency bands and a report order (such as ascending order) regarding the number of uplink component carriers or the number of downlink component carriers. The present invention relates to a user device having a capability information reporting unit.

  Another aspect of the present invention is a capability information reporting method in a user apparatus having a carrier aggregation function, which is a capability inquiry for causing a base station to report a combination of frequency bands that can be carrier-aggregated supported by the user apparatus. A capability of receiving a message and reporting each combination of frequency bands capable of carrier aggregation to the base station according to a reporting order (such as ascending order) regarding the number of uplink component carriers or the number of downlink component carriers. Information reporting method.

  ADVANTAGE OF THE INVENTION According to this invention, the technique for reporting each combination of the frequency band in which a user apparatus can carry out a carrier aggregation to a base station can be provided.

FIG. 1 is a diagram illustrating combinations of frequency bands that can be carrier-aggregated according to the prior art and their reporting order. FIG. 2 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention. FIG. 3 is a block diagram illustrating a configuration of a user apparatus according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a downlink priority report order of combinations of frequency bands capable of carrier aggregation according to an embodiment of the present invention. FIG. 5 is a diagram illustrating an uplink priority report order of combinations of frequency bands capable of carrier aggregation according to an embodiment of the present invention. FIG. 6 is a diagram illustrating an example of signaling designating a report order according to an embodiment of the present invention. FIG. 7 is a diagram illustrating a specific example for identifying combinations of frequency bands capable of carrier aggregation according to an embodiment of the present invention. FIG. 8 is a diagram illustrating an example of signaling designating a report target according to an embodiment of the present invention. FIG. 9 is a diagram illustrating a signaling example for designating a report target according to an embodiment of the present invention. FIG. 10 is a flowchart showing a capability information report process according to an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the following embodiments, a user apparatus having a carrier aggregation function is disclosed. In summary, when the base station transmits a capability inquiry message for reporting a combination of carrier-aggregable frequency bands supported by the user equipment, the user equipment can determine the number of uplink component carriers or downlink components. Each combination of frequency bands that can be carrier-aggregated is reported to the base station according to a report order such as ascending order regarding the number of carriers. In addition, when the base station specifies the combination of the number of uplink component carriers to be reported and the number of downlink component carriers, the user equipment identifies the combination of frequency bands that can be reported by the carrier aggregation. Then, each identified combination is reported to the base station according to the reporting order described above.

  As a result, the reporting order of each combination of frequency bands capable of carrier aggregation other than the combination (2DL + 1UL) of two downlink component carriers (2DL) and one uplink component carrier (1UL) not defined in the LTE standard is set. It becomes possible to specify.

  A radio communication system according to an embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention.

  As illustrated in FIG. 2, the wireless communication system 10 includes a user apparatus 100 and base stations 200A and 200B (hereinafter, may be collectively referred to as the base station 200). The radio communication system 10 supports carrier aggregation in which the user apparatus 100 performs simultaneous communication using component carriers CC # 1, CC # 2, and CC # 3 provided by the base stations 200A and 200B.

  The user apparatus 100 has a carrier aggregation function and can perform simultaneous communication using a plurality of cells provided by one or more base stations 200. As illustrated, the user apparatus 100 simultaneously receives CC # 1 and CC # 2 provided by two different base stations 200A and 200B of a master base station (MeNB) 200A and a secondary base station (SeNB) 200B, respectively. Communication is possible with the dual connectivity used. Moreover, the user apparatus 100 can also communicate by the carrier aggregation (intra eNB CA) which utilized CC # 1 and CC # 3 provided by one base station 200A simultaneously. In the illustrated embodiment, only two base stations 200 </ b> A and 200 </ b> B are shown, but in general, a large number of base stations 200 are arranged to cover the service area of the wireless communication system 10.

  Typically, the user apparatus 100 may be any appropriate information processing apparatus having a wireless communication function such as a smartphone, a mobile phone, a tablet, a mobile router, and a wearable terminal as illustrated. The user apparatus 100 includes a CPU (Central Processing Unit) such as a processor, a memory apparatus such as a RAM (Random Access Memory) and a flash memory, a wireless communication apparatus for transmitting and receiving radio signals to and from the base stations 200A and 200B, and the like. Composed. For example, each function and process of the user device 100 described later may be realized by the CPU processing or executing data or a program stored in the memory device. However, the user apparatus 100 is not limited to the hardware configuration described above, and may be configured by a circuit that realizes one or more of the processes described below.

  The base station 200 wirelessly communicates with the user apparatus 100 by carrier aggregation, thereby receiving a downlink (DL) packet received from a network apparatus such as an upper station or a server that is communicatively connected to a core network (not shown). While transmitting to the apparatus 100, the uplink (UL) packet received from the user apparatus 100 is transmitted to the network apparatus. In the dual connectivity CA, the base station 200A functions as a master base station (MeNB) or a primary base station, and the base station 200B functions as a secondary base station (SeNB). In this case, the master base station 200A controls simultaneous communication between the user apparatus 100 and the base stations 200A and 200B by dual connectivity, and also controls communication with a higher-level core network (not shown). On the other hand, in intra eNB CA, the user apparatus 100 performs simultaneous communication using a plurality of component carriers provided by the base station 200A.

  Next, the configuration of the user apparatus according to an embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram illustrating a configuration of a user apparatus according to an embodiment of the present invention.

  As illustrated in FIG. 3, the user device 100 includes a communication control unit 110, a capability information management unit 120, and a capability information report unit 130.

  The communication control unit 110 controls wireless communication with the base station 200. Specifically, the communication control unit 110 performs various wireless channels such as an uplink / downlink control channel and an uplink / downlink data channel with the base station 200 in order to realize wireless communication with the base station 200. Controls sending and receiving.

The capability information management unit 120 manages combinations of frequency bands that are supported by the user apparatus 100 and are capable of carrier aggregation. Specifically, the capability information management unit 120 supports the user apparatus 100 for each combination (# DL + # UL) of the number of uplink component carriers (#DL) and the number of downlink component carriers (#UL). To manage combinations of frequency bands that can be carrier-aggregated. For example, capability information management unit 120, the combination of the two downlink (2DL) and one uplink (1UL) (2DL + 1UL) , the combination of carrier aggregation possible frequencies band _{^{(DL 11 2DL + 1UL, DL}} 21 2DL + 1UL, UL ₁₁ ^{2DL + 1UL} ), (DL ₁₂ ^{2DL + 1UL} , DL ₂₂ ^{2DL + 1UL} , UL ₁₂ ^{2DL + 1UL} ),... And carrier aggregation for a combination of two downlinks (2DL) and two uplinks (2UL) (2DL + 2UL) the combination of possible frequency bands _{^{(DL 11 2DL + 2UL, DL}} 21 2DL + 2UL, UL 11 2DL + 2UL, UL 21 2DL + 2UL), (DL 12 2DL + 2UL, DL 22 2D _{^{+ 2UL, UL 12 2DL + 2UL}} , UL 22 2DL + 2UL), it holds ..., similarly, may hold the combination of carrier aggregation possible frequency bands up 5DL + 5UL. Note that the capability information management unit 120 may further hold a frequency band to be supported in a state where carrier aggregation is not applied as a combination of 1DL + 1UL (Non-CA).

  In the specific example described above, each combination from 2DL + 1UL to 5DL + 5UL has been described as a combination of frequency bands capable of carrier aggregation. However, the present invention is not limited to this, and the number of other uplink component carriers and the number of downlink component carriers can be reduced. A combination with the number of link component carriers may be included.

  The capability information reporting unit 130 reports each combination of frequency bands that can be carrier-aggregated to the base station 200 according to the reporting order regarding the number of uplink component carriers or the number of downlink component carriers. In one embodiment, the capability information reporting unit 130 may report each combination of frequency bands that can be carrier-aggregated to the base station 200 in ascending order of the number of uplink component carriers or the number of downlink component carriers.

  For example, when reporting each combination of frequency bands that can be carrier-aggregated to the base station 200 in ascending order of the number of downlink component carriers, the capability information report unit 130 first supports the carrier aggregation in the priority 1 state without applying the carrier aggregation. To the base station 200, and then reports to the base station 200 a combination of frequency bands (2DL + 1UL) capable of carrier aggregation of 2DL + 1UL with priorities 2 and 3. Next, at priority 4, the user apparatus 100 follows the ascending order of the number of downlink component carriers, that is, the number of uplink component carriers and the number of downlink component carriers up to 5DL + 5UL as illustrated in FIG. 3DL + 1UL, 4DL + 1UL, 5DL + 1UL, 2DL + 2UL, 3DL + 2UL, 4DL + 2UL, 5DL + 2UL, 3DL + 3UL, 4DL + 3UL, 5DL + 3UL, 4DL + 4UL, and 5DL + 4UL, 5DL + 5UL.

  On the other hand, when reporting each combination of frequency bands capable of carrier aggregation to the base station 200 in ascending order of the number of uplink component carriers, the capability information reporting unit 130 first supports the carrier aggregation in the priority 1 state without applying the carrier aggregation. To the base station 200, and then reports to the base station 200 a combination of frequency bands (2DL + 1UL) capable of carrier aggregation of 2DL + 1UL with priorities 2 and 3. Next, at priority 4, the user equipment 100 follows the ascending order of the number of uplink component carriers, that is, the number of uplink component carriers and the number of downlink component carriers up to 5DL + 5 UL as illustrated in FIG. 2DL + 2UL, 3DL + 1UL, 3DL + 2UL, 3DL + 3UL, 4DL + 1UL, 4DL + 2UL, 4DL + 3UL, 4DL + 4UL, 5DL + 1UL, 5DL + 2UL, 5DL + 3UL, and 5DL + 4UL, 5DL + 5UL.

  Further, in one embodiment, the capability information report unit 130 sets each combination composed of frequency bands designated by the base station 200 in ascending order of the number of uplink component carriers or the number of downlink component carriers. Then, each combination including a frequency band not designated by the base station 200 may be reported to the base station 200. Regarding the 2DL + 1UL combination, according to the specification, the user apparatus 100 first reports to the base station 200 a 2DL + 1UL combination configured only by a frequency band that can be carrier-aggregated designated by the base station 200 according to priority 2, and then According to the priority 3, other 2DL + 1UL combinations are reported to the base station 200. In the present embodiment, similarly for each combination of the number of other uplink component carriers and the number of downlink component carriers, the user apparatus 100 first selects each combination configured from the frequency band designated by the base station 200. Report to the base station 200 and then report each combination including a frequency band not designated by the base station 200 to the base station 200.

  For example, when reporting each combination of frequency bands that can be carrier-aggregated to the base station 200 in ascending order of the number of downlink component carriers, the capability information report unit 130 first supports the carrier aggregation in the priority 1 state without applying the carrier aggregation. To the base station 200, and then reports to the base station 200 a combination of frequency bands (2DL + 1UL) capable of carrier aggregation of 2DL + 1UL with priorities 2 and 3. Next, as illustrated in FIG. 4, the user apparatus 100 reports each combination configured with the frequency band designated by the base station 200 to the base station 200 in ascending order of downlink component carriers, as illustrated in FIG. 4. . That is, the user apparatus 100 has 3DL + 1UL (3), 4DL + 1UL (4), 5DL + 1UL (5), 2DL + 2UL (6), 3DL + 2UL (7), 4DL + 2UL (8), 5DL + 2UL (9), 3DL + 3UL (10), 4DL + 3UL (11). ) 5DL + 3UL (12), 4DL + 4UL (13), 5DL + 4UL (14), and 5DL + 5UL (15) in the order of reporting, each combination of frequency bands that can be carrier-aggregated configured from the frequency bands specified by the base station 200 Report to station 200. Next, the user apparatus 100 has 3DL + 1UL (16), 4DL + 1UL (17), 5DL + 1UL (18), 2DL + 2UL (19), 3DL + 2UL (20), 4DL + 2UL (21), 5DL + 2UL (22), 3DL + 3UL (23), 4DL + 3UL ( 24) 5DL + 3UL (25), 4DL + 4UL (26), 5DL + 4UL (27), and 5DL + 5UL (28) are reported in the order of reporting, and each combination of frequency bands capable of carrier aggregation including frequency bands not specified by the base station 200 is assigned to the base station 200. To report to.

  On the other hand, when reporting each combination of frequency bands capable of carrier aggregation to the base station 200 in ascending order of the number of uplink component carriers, the capability information reporting unit 130 first supports the carrier aggregation in the priority 1 state without applying the carrier aggregation. To the base station 200, and then reports to the base station 200 a combination of frequency bands (2DL + 1UL) capable of carrier aggregation of 2DL + 1UL with priorities 2 and 3. Next, as illustrated in FIG. 5, the user apparatus 100 reports each combination including the frequency band designated by the base station 200 to the base station 200 in the ascending order of uplink component carriers, as shown in FIG. 5. . That is, the user apparatus 100 has 2DL + 2UL (3), 3DL + 1UL (4), 3DL + 2UL (5), 3DL + 3UL (6), 4DL + 1UL (7), 4DL + 2UL (8), 4DL + 3UL (9), 4DL + 4UL (10), 5DL + 1UL (11). ) 5DL + 2UL (12), 5DL + 3UL (13), 5DL + 4UL (14), and 5DL + 5UL (15) in the order of reporting, each combination of frequency bands that can be carrier-aggregated configured from the frequency bands specified by the base station 200 Report to station 200. Next, the user apparatus 100 receives 2DL + 2UL (16), 3DL + 1UL (17), 3DL + 2UL (18), 3DL + 3UL (19), 4DL + 1UL (20), 4DL + 2UL (21), 4DL + 3UL (22), 4DL + 4UL (23), 5DL + 1UL ( 24) 5DL + 2UL (25), 5DL + 3UL (26), 5DL + 4UL (27), and 5DL + 5UL (28) are reported in the order of reporting, and each combination of frequency bands capable of carrier aggregation including frequency bands not specified by the base station 200 is assigned to the base station 200. To report to.

  In one embodiment, the reporting order of the ascending order of the number of uplink component carriers or the ascending order of the number of downlink component carriers is preset in the capability information reporting unit 130, and the capability information reporting unit 130 Each combination of frequency bands capable of carrier aggregation may be reported to the base station 200 according to the set report order. That is, the reporting order to be applied is statically set in the capability information reporting unit 130, and the capability information reporting unit 130 determines the number of uplink component carriers and the number of downlink component carriers according to the statically set reporting order. A combination of frequency bands that can be carrier-aggregated in each combination may be reported to the base station 200.

  For example, in the ascending order of the number of downlink component carriers, the user apparatus 100 first reports each combination composed of frequency bands designated by the base station 200 to the base station 200, and then frequency bands not designated by the base station 200. It is assumed that each combination including is reported in advance to the base station 200. In this case, after executing the priorities 1 to 3, the user apparatus 100 performs 3DL + 1UL (3), 4DL + 1UL (4), 5DL + 1UL (5), 2DL + 2UL (6), 3DL + 2UL (7), 4DL + 2UL (8), 5DL + 2UL ( 9) 3DL + 3UL (10), 4DL + 3UL (11), 5DL + 3UL (12), 4DL + 4UL (13), 5DL + 4UL (14), and 5DL + 5UL (15), composed of frequency bands specified by the base station 200 Each combination of frequency bands capable of carrier aggregation is reported to the base station 200, and then 3DL + 1UL (16), 4DL + 1UL (17), 5DL + 1UL (18), 2DL + 2UL (19), 3DL + 2UL (20), 4DL + 2UL (21), 5DL + 2UL (2 ) 3DL + 3UL (23), 4DL + 3UL (24), 5DL + 3UL (25), 4DL + 4UL (26), 5DL + 4UL (27), 5DL + 5UL (28), and carrier aggregation including frequency bands not specified by the base station 200 is possible. Each combination of frequency bands is reported to the base station 200.

  On the other hand, in ascending order of the number of uplink component carriers, the user apparatus 100 first reports each combination composed of the frequency bands designated by the base station 200 to the base station 200, and then the frequency bands not designated by the base station 200. It is assumed that each combination including is reported in advance to the base station 200. In this case, after executing the priorities 1 to 3, the user apparatus 100 performs 2DL + 2UL (3), 3DL + 1UL (4), 3DL + 2UL (5), 3DL + 3UL (6), 4DL + 1UL (7), 4DL + 2UL (8), 4DL + 3UL ( 9) 4DL + 4UL (10), 5DL + 1UL (11), 5DL + 2UL (12), 5DL + 3UL (13), 5DL + 4UL (14), and 5DL + 5UL (15), composed of frequency bands specified by the base station 200 Each combination of frequency bands capable of carrier aggregation is reported to the base station 200, and then 2DL + 2UL (16), 3DL + 1UL (17), 3DL + 2UL (18), 3DL + 3UL (19), 4DL + 1UL (20), 4DL + 2UL (21), 4DL + 3UL (2 ) 4DL + 4UL (23), 5DL + 1UL (24), 5DL + 2UL (25), 5DL + 3UL (26), 5DL + 4UL (27), 5DL + 5UL (28), and carrier aggregation including frequency bands not specified by the base station 200 is possible. Each combination of frequency bands is reported to the base station 200.

  Alternatively, in another embodiment, the communication control unit 110 receives from the base station 200 a message indicating which report order, that is, the ascending order of the number of uplink component carriers or the ascending order of the number of downlink component carriers should be applied. Then, the capability information reporting unit 130 may report each combination of frequency bands capable of carrier aggregation to the base station 200 according to the reporting order specified in the received message. For example, the base station 200 sets the “prioritized CA configurations” field to “dl” or “ul” in the capability inquiry message (UECapabilityEnquiry message) shown in FIG. The report order of the combinations may be specified in ascending order of the number of downlink component carriers (dl) or ascending order of the number of uplink component carriers (ul), respectively.

  In a further embodiment, the communication control unit 110 receives from the base station 200 a message indicating which carrier aggregation between the carrier aggregation between different frequency bands and the carrier aggregation within the same frequency band, and the capability information The reporting unit 130 may report each combination of frequency bands capable of carrier aggregation corresponding to the carrier aggregation specified in the received message to the base station 200. For example, the base station 200 sets the “prioritized CA band combinations” field in the capability inquiry message illustrated in FIG. 6 to “inter” or “intra”, thereby performing carrier aggregation between different frequency bands and carriers in the same frequency band. Aggregation may be specified.

  In the above-described embodiment, the capability information reporting unit 130 sequentially reports each combination of frequency bands that can be carrier-aggregated to the base station 200 according to the set reporting order after the execution of the priorities 1 to 3. On the other hand, there are cases where all 14 patterns from 2DL + 1UL to 5DL + 5UL do not necessarily have to be reported to the base station 200. In this case, the base station 200 only uses a combination of frequency bands that can be carrier-aggregated (# DL + # UL) for the combination of the designated number of uplink component carriers (#UL) and the number of downlink component carriers (#DL). May be reported to the user device 100. For example, the communication control unit 110 receives a message indicating a combination of the number of uplink component carriers and the number of downlink component carriers to be reported from the base station 200, and the capability information report unit 130 receives the received uplink. Each combination of frequency bands capable of carrier aggregation corresponding to the combination of the number of component carriers and the number of downlink component carriers may be reported to the base station 200. Therefore, each combination (# DL + # UL) of the received number of uplink component carriers and the number of downlink component carriers (# DL + # UL) is numbered, and the base station 200 is allowed to perform carrier aggregation frequency band reporting to the user apparatus 100. You may specify a combination.

  For example, in the identification example of each combination illustrated in FIG. 7, the frequency band (1DL + 1UL or Non-CA) supported by the user apparatus 100 in a state where carrier aggregation is not applied is identified as the first combination (1st), and then 2DL + 1UL may be identified as the second combination, and other combinations may be identified as shown in FIG. In this way, when identifiers are assigned to the 15 combinations, the base station 200 can specify a combination of frequency bands capable of carrier aggregation to be reported to the user apparatus 100 using the identifiers. For example, the base station 200 sets, in the capability inquiry message shown in FIG. 8, a bit corresponding to a combination of frequency bands that can be reported by the user apparatus 100, including the “requested CA configurations” field of a 15-bit long bit string. By doing so, one or more combinations of frequency bands capable of carrier aggregation may be specified. Upon receiving the capability inquiry message, the capability information report unit 130 identifies the combination of the number of uplink component carriers and the number of downlink component carriers corresponding to the set bits, and can perform carrier aggregation to the combination. The combination of frequency bands is reported to the base station 200.

  Here, when a plurality of combinations are designated, the capability information reporting unit 130 reports each combination of frequency bands that can be carrier-aggregated to the base station 200 in accordance with the set report order. For example, when the 1st to 5th bits are set in the “requested CA configurations” field, and the report order is the ascending order of the number of downlink component carriers, the capability information report unit 130 includes 1DL + 1UL (Non-CA), 2DL + 1UL, 3DL + 1UL, Each combination of frequency bands that can be carrier-aggregated is reported to the base station 200 according to the reporting order of 4DL + 1UL and 5DL + 1UL.

  Meanwhile, the communication control unit 110 receives a message indicating the combination of the number of uplink component carriers and the number of downlink component carriers that need not be reported from the base station 200, and the capability information report unit 130 receives the message. Each combination of frequency bands capable of carrier aggregation that does not correspond to the number of uplink component carriers and the number of downlink component carriers may be reported to the base station 200. In this case, the base station 200 specifies a combination of frequency bands capable of carrier aggregation that need not be reported to the user apparatus 100 by the identifier, and the capability information report unit 130 determines the number of uplink component carriers that are not specified. A combination with the number of downlink component carriers is specified, and a combination of frequency bands that can be carrier-aggregated in the combination is reported to the base station 200.

  In another embodiment, the communication control unit 110 receives a message indicating the maximum number of uplink component carriers and the maximum number of downlink component carriers to be reported from the base station 200, and the capability information reporting unit 130. May report to base station 200 each combination of frequency bands capable of carrier aggregation corresponding to combinations of uplink component carriers and downlink component carriers equal to or less than the maximum number specified in the received message. For example, the base station 200 sets the maximum number of downlink component carriers and the maximum number of uplink component carriers in the capability requested message shown in FIG. 9 by setting the maximum number of downlink component carriers and the maximum number of uplink component carriers in the “requested CA configuration DL” field and the “requested CA configuration UL” field, respectively. One or more combinations of frequency bands that can be aggregated may be designated. Upon receiving the capability inquiry message, the capability information report unit 130 identifies combinations of uplink component carriers and downlink component carriers that are equal to or less than the set maximum number, and frequency aggregation bands corresponding to the combination are available. The combination is reported to the base station 200. For example, when the maximum number of downlink component carriers is specified as 3 and the maximum number of uplink component carriers is specified as 2, the capability information report unit 130 reports the first to third combinations and the sixth to seventh combinations as reporting targets. Each combination of frequency bands that can be identified and can be carrier-aggregated corresponding to these combinations is reported to the base station 200. In this case, if the report order is the ascending order of the number of downlink component carriers, the capability information report unit 130 may perform carrier aggregation according to the report order of 1DL + 1UL (Non-CA), 2DL + 1UL, 3DL + 1UL, 2DL + 2UL, 3DL + 2UL. Are reported to the base station 200.

  In yet another embodiment, the communication control unit 110 receives a message indicating the maximum common value of the number of uplink component carriers and the number of downlink component carriers to be reported from the base station 200, and the capability information The reporting unit 130 may report each combination of frequency bands capable of carrier aggregation corresponding to a combination of uplink component carriers and downlink component carriers equal to or less than the maximum value specified in the received message to the base station 200. . For example, the base station 200 may specify one or more combinations of frequency bands that can be carrier-aggregated by setting the maximum number in the capability inquiry message. When the capability inquiry message is received, the capability information report unit 130 identifies the combination of the uplink component carrier and the downlink component carrier that are equal to or less than the set maximum value, and the frequency band of the carrier band that can be carrier-aggregated corresponding to the combination. The combination is reported to the base station 200. For example, when the maximum value is designated as 3, the capability information reporting unit 130 identifies the first to third combinations and the sixth combination as the report target, and each combination of frequency bands that can be carrier-aggregated corresponding to these combinations. To the base station 200. At this time, if the reporting order is the ascending order of the number of downlink component carriers, the capability information reporting unit 130 can perform carrier aggregation according to the reporting order of 1DL + 1UL (Non-CA), 2DL + 1UL, 3DL + 1UL, 2DL + 2UL, 3DL + 2UL, 3DL + 3UL. Each combination of frequency bands is reported to the base station 200.

  In the above-described embodiment, the reporting order is set in ascending order of the number of uplink component carriers or downlink component carriers. However, the present invention is not limited to this, and any other appropriate uplink component carrier. And / or a reporting order based on a combination of the number of downlink component carriers may be applied.

  For example, the user apparatus 100 may report each combination of frequency bands capable of carrier aggregation to the base station 200 in descending order of the number of uplink component carriers or downlink component carriers. Thereby, for example, in the case where radio resources equal to or higher than a predetermined threshold are unused in the base station 200 or when radio resources equal to or higher than the predetermined threshold are required for communication with the user apparatus 100, the base station 200 Since as many radio resources as possible are allocated to the user apparatus 100, it is possible to preferentially report combinations of frequency bands capable of carrier aggregation of 5DL + 5UL.

  Next, the capability information reporting process in the user apparatus according to an embodiment of the present invention will be described with reference to FIG. FIG. 10 is a flowchart showing a capability information report process according to an embodiment of the present invention.

  As illustrated in FIG. 10, in step S101, the communication control unit 110 sends a capability inquiry message (UECapabilityEnquiry message) for reporting a combination of frequency bands capable of carrier aggregation supported by the user apparatus 100 from the base station 200. Receive. When receiving the capability inquiry message, the capability information reporting unit 130 determines a combination of frequency bands that can be subjected to carrier aggregation and a report order based on the received capability inquiry message.

  For example, in order to specify a combination of report targets, the base station 200 may specify an identifier that identifies one or more combinations of report targets. Alternatively, the base station 200 notifies the maximum number of downlink component carriers and the maximum number of uplink component carriers, and reports the combination of the number of downlink component carriers and the number of uplink component carriers that are less than the maximum number. You may specify as a target. Further, the report order may be statically set in the user apparatus 100 or may be specified in a capability inquiry message transmitted from the base station 200.

  In step S102, the capability information reporting unit 130 reports each combination of frequency bands that can be carrier-aggregated to the base station 200 according to the determined reporting order regarding the number of uplink component carriers or the number of downlink component carriers. For example, when the report order is set in ascending order of the number of downlink component carriers, the capability information report unit 130 determines each combination of frequency bands that can be reported by carrier aggregation according to the ascending order of the number of downlink component carriers. Report to base station 200. Also, when the reporting order is set in ascending order of the number of downlink component carriers and the frequency band is designated from the base station, the capability information reporting unit 130 starts from the base station 200 according to the ascending order of the number of downlink component carriers. Each combination including the designated frequency band is first reported to the base station 200, and thereafter each combination including a frequency band not designated by the base station 200 is reported to the base station 200.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the specific embodiment mentioned above, In the range of the summary of this invention described in the claim, various deformation | transformation・ Change is possible.

10 wireless communication system 100 user equipment 110 communication control unit 120 capability information management unit 130 capability information reporting unit 200 base station

Claims (10)

A user device having a carrier aggregation function,
A communication control unit for controlling wireless communication with the base station;
A capability information management unit that manages combinations of frequency bands capable of carrier aggregation supported by the user apparatus;
A capability information reporting unit that reports each combination of frequency bands that can be carrier-aggregated to the base station according to a reporting order regarding the number of uplink component carriers or the number of downlink component carriers;
A user device.   The capability information report unit reports each combination composed of frequency bands designated by the base station to the base station in ascending order of the number of uplink component carriers or the number of downlink component carriers, and then The user apparatus of Claim 1 which reports each combination including the frequency band which is not designated from the said base station to the said base station. Which reporting order of the ascending order of the number of uplink component carriers and the ascending order of the number of downlink component carriers should be used in advance in the capability information report unit,
The said capability information report part is a user apparatus of Claim 2 which reports each combination of the said frequency band which can be carrier-aggregated to the said base station according to the said report order set. The communication control unit receives from the base station a message indicating which report order should be applied, the ascending order of the number of uplink component carriers and the ascending order of the number of downlink component carriers,
The said capability information report part is a user apparatus of Claim 2 which reports each combination of the frequency band in which the said carrier aggregation can be performed to the said base station according to the report order designated by the said received message. The communication control unit receives from the base station a message indicating which carrier aggregation between carrier aggregation between different frequency bands and carrier aggregation within the same frequency band,
5. The user according to claim 1, wherein the capability information report unit reports each combination of the frequency bands capable of carrier aggregation corresponding to carrier aggregation specified in the received message to the base station. 6. apparatus. The communication control unit receives a message indicating the combination of the number of uplink component carriers and the number of downlink component carriers to be reported from the base station,
The capability information report unit reports to the base station each combination of frequency bands capable of carrier aggregation corresponding to a combination of the number of uplink component carriers and the number of downlink component carriers specified in the received message. The user apparatus according to any one of claims 1 to 5. The communication control unit receives a message indicating a combination of the number of uplink component carriers and the number of downlink component carriers that need not be reported from the base station,
The capability information reporting unit reports to the base station each combination of the frequency bands capable of carrier aggregation not corresponding to the number of uplink component carriers and the number of downlink component carriers specified in the received message; The user apparatus as described in any one of Claims 1 thru | or 5. The communication control unit receives a message indicating the maximum number of uplink component carriers and the maximum number of downlink component carriers to be reported from the base station;
The capability information reporting unit reports to the base station each combination of frequency bands capable of carrier aggregation corresponding to combinations of uplink component carriers and downlink component carriers equal to or less than the maximum number specified in the received message. The user apparatus according to any one of claims 1 to 5. The communication control unit receives a message indicating the maximum common value between the number of uplink component carriers and the number of downlink component carriers to be reported from the base station;
The capability information report unit reports to the base station each combination of frequency bands capable of carrier aggregation corresponding to combinations of uplink component carriers and downlink component carriers that are equal to or less than the maximum value specified in the received message. The user apparatus according to any one of claims 1 to 5. A capability information reporting method in a user apparatus having a carrier aggregation function,
Receiving a capability inquiry message from a base station for reporting a combination of carrier-aggregable frequency bands supported by the user equipment;
Reporting each combination of frequency bands capable of carrier aggregation to the base station according to a reporting order for the number of uplink component carriers or the number of downlink component carriers;
A capability information reporting method.

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