JP6612204B2 - Wireless communication system, base station and mobile station - Google Patents

Description

  The present invention relates to a radio communication system capable of performing communication between a base station and a mobile station, and a base station and a mobile station used for the communication.

  Conventionally, wireless communication (hereinafter also referred to as “multiband communication”) using a plurality of frequency bands simultaneously between a base station and a mobile station (also referred to as “mobile device” or “user apparatus (UE)”). It is known (see, for example, Patent Document 1).

  In the multiband communication, for example, in the downlink, the base station distributes packets of transmission target data to a plurality of frequency bands and transmits the packets to the mobile station. This packet distribution may be performed based on fairness between mobile stations and radio channel conditions considered in the conventional single frequency scheduler, or based on load distribution between frequency bands. . However, it has been found that the communication quality required by the user may not be provided even if packets are distributed in consideration of fairness among mobile stations, radio channel conditions, and load distribution. For example, frequent handovers occur in voice communications that require uninterrupted communication, sufficient throughput is not obtained in large-capacity data communications, or the communication quality of the session between the mobile station and the communication network is degraded. It was found that the communication quality requested by the user may not be provided by being disconnected.

  The present invention has been made in view of the above problems, and an object of the present invention is to suppress deterioration in communication quality when communication is performed using a plurality of frequency bands simultaneously between a base station and a mobile station. It is to provide a wireless communication system, a base station and a mobile station.

A radio communication system according to an aspect of the present invention is a radio communication system capable of communicating by simultaneously using a plurality of frequency bands between a base station and a mobile station, and user context information relating to a user usage status of the mobile station And means for acquiring at least one information of session information of packet communication by the mobile station, and transmission / reception between the base station and the mobile station based on at least one information of the user context information and the session information Means for distributing the packets to be transmitted to the plurality of frequency bands.
In the wireless communication system, the mobile station includes user context information acquisition means for acquiring the user context information, and information transmission means for transmitting the user context information to the base station. Information receiving means for receiving user context information from the mobile station, and downlink packets transmitted from the base station to the mobile station based on the user context information received from the mobile station in the plurality of frequency bands You may provide the packet distribution means to distribute, and the packet transmission means to transmit the packet distributed to the said some frequency band.
Further, in the wireless communication system, the base station is configured to acquire session information of a downlink packet transmitted from the base station to the mobile station, and based on the session information, the downlink information Packet distribution means for distributing packets to the plurality of frequency bands, and packet transmission means for transmitting packets distributed to the plurality of frequency bands may be provided.
In the wireless communication system, the mobile station includes user context information acquisition means for acquiring the user context information, and information transmission means for transmitting the user context information to the base station. Information receiving means for receiving the user context information from the mobile station, and uplink packets transmitted from the mobile station to the base station based on the user context information received from the mobile station. Packet distribution means for distributing to a band, and schedule instruction information transmission means for transmitting schedule instruction information including distribution information of the uplink packet to the mobile station, wherein the mobile station transmits the schedule instruction information to the mobile station. Schedule instruction information receiving means for receiving from the base station; Based on Yuru instruction information, and packet transmitting means for transmitting a packet distributed to the plurality of frequency bands may be provided.
In the wireless communication system, the mobile station acquires session information acquisition means for acquiring session information of an uplink packet transmitted from the mobile station to the base station, and information for transmitting the session information to the base station Transmitting means, wherein the base station receives the session information from the mobile station, and based on the session information received from the mobile station, the base station transmits the uplink packet to the plurality of frequencies. Packet distribution means for distributing to a band, and schedule instruction information transmission means for transmitting schedule instruction information including distribution information of the uplink packet to the mobile station, wherein the mobile station transmits the schedule instruction information to the mobile station. Schedule instruction information receiving means for receiving from the base station, and the schedule instruction information Based on a packet transmitting means for transmitting a packet distributed to the plurality of frequency bands may be provided.
Further, in the wireless communication system, the mobile station acquires user context information acquisition means for acquiring the user context information, and an uplink packet transmitted from the mobile station to the base station based on the user context information. Packet distribution means for distributing to the plurality of frequency bands and packet transmission means for transmitting the packets distributed to the plurality of frequency bands may be provided.
Further, in the wireless communication system, the mobile station acquires session information of an uplink packet transmitted from the mobile station to the base station, and based on the session information, the uplink information Packet distribution means for distributing packets to the plurality of frequency bands, and packet transmission means for transmitting packets distributed to the plurality of frequency bands may be provided.

  A base station according to another aspect of the present invention is a base station that can communicate with a mobile station using a plurality of frequency bands simultaneously, and includes user context information related to user usage status of the mobile station and the mobile station Information acquisition means for acquiring at least one piece of session information of packet communication by means of, and, based on at least one piece of information of the user context information and the session information, downlink packets to be transmitted to the mobile station Packet distribution means for distributing to frequency bands, and packet transmission means for transmitting packets distributed to the plurality of frequency bands.

A mobile station according to still another aspect of the present invention is a mobile station that can communicate with a base station using a plurality of frequency bands at the same time, and user context information related to a user usage status of the mobile station, and Information acquisition means for acquiring at least one information of session information of packet communication by the mobile station, information transmission means for transmitting at least one information of the user context information and the session information to the base station, and the user context Schedule instruction information receiving means for receiving, from the base station, schedule instruction information including uplink packet distribution information distributed by the base station based on at least one of information and session information; and the schedule instruction information Packets distributed to the plurality of frequency bands based on Comprising a packet transmitting unit that signal, the.
A mobile station according to still another aspect of the present invention is a mobile station that can communicate with a base station using a plurality of frequency bands at the same time, and user context information related to a user usage status of the mobile station, and Information acquisition means for acquiring at least one piece of session information of packet communication by the mobile station, and an uplink packet transmitted to the base station based on at least one of the user context information and the session information Packet distribution means for distributing the packets to the plurality of frequency bands, and packet transmission means for transmitting the packets distributed to the plurality of frequency bands.

In the wireless communication system, the base station, and the mobile station, the user context information includes presence information of a user using the mobile station, position information of the mobile station, movement speed information of the mobile station, and the movement Application information related to the activation status of an application that uses packet communication by a station, usage environment information of the mobile station, information on behavior before or after use of the mobile station, date and time information on use of the mobile station Or at least one of time zone information, health information of a user using the mobile station, information on a user's psychological state using the mobile station, and weather information when using the mobile station May be included.
Further, in the wireless communication system, the base station, and the mobile station, based on the user context information, in the case of a communication packet with a large communication volume, the communication speed is high or the communication capacity is large in the plurality of frequency bands. The packet is distributed to a frequency band, and in the case of a communication packet with a small communication volume, the packet is distributed so that the packet is distributed to a frequency band having a low communication speed or a small communication capacity among the plurality of frequency bands. May be.
Further, in the wireless communication system, the base station, and the mobile station, packets may be collected and allocated to frequency bands for each session based on the session information.
Further, in the wireless communication system, the base station, and the mobile station, at least one information of the user context information and the session information, fairness between frequency bands in the plurality of frequency bands, and connection to the base station Based on fairness between mobile stations in the plurality of mobile stations, load distribution between the frequency bands in the plurality of frequency bands and at least one information of the radio channel status of each frequency band Packets transmitted / received to / from a station may be distributed to the plurality of frequency bands.

In the wireless communication system, the base station, and the mobile station, the packet distribution means includes a scheduler of a media access control layer (MAC layer) of the base station, or a packet convergence protocol layer of the base station or the mobile station. It may be provided in the bearer splitter of (PDCP layer).
Further, in the radio communication system and the base station, the base station transmits a plurality of sets of antennas and radio signal amplifying units provided corresponding to the plurality of frequency bands, and the plurality of radio signal amplifying units, respectively. You may provide the concentration base station connected with the cable.
In the radio communication system and the base station, the base station may form a macro cell and a small cell (a micro cell or a nano cell) corresponding to each of the plurality of frequency bands.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of communication quality at the time of communicating using a some frequency band simultaneously between a base station and a mobile station can be suppressed.

Explanatory drawing which shows an example of the frequency band used for a mobile communication system. Explanatory drawing which shows the example of arrangement | positioning of the several base station in a mobile communication system. 1 is a functional block diagram of a base station and a mobile station when performing downlink multiband communication by carrier aggregation in a mobile communication system according to an embodiment of the present invention. Explanatory drawing of the session information of a packet. Explanatory drawing for demonstrating an example of packet distribution which distributes the packet of the data transmitted with respect to the mobile station of a some user from a base station to a some frequency band. The functional block diagram of a base station and a mobile station when performing downlink multiband communication by dual connectivity in a mobile communication system according to another embodiment. Furthermore, the functional block diagram of a base station and a mobile station when performing downlink multiband communication by carrier aggregation in the communication system which concerns on other embodiment. The functional block diagram of a base station and a mobile station when performing downlink multiband communication by dual connectivity in a wireless communication system according to still another embodiment. The functional block diagram of a base station and a mobile station when performing downlink multiband communication by dual connectivity in a wireless communication system according to still another embodiment. The functional block diagram of a base station and a mobile station when performing uplink multiband communication by carrier aggregation in a wireless communication system according to still another embodiment. Furthermore, the functional block diagram of a base station and a mobile station when performing uplink multiband communication by dual connectivity in the radio | wireless communications system which concerns on other embodiment. The functional block diagram of a base station and a mobile station when performing uplink multiband communication by carrier aggregation in a wireless communication system according to still another embodiment. Furthermore, the functional block diagram of a base station and a mobile station when performing uplink multiband communication by dual connectivity in the radio | wireless communications system which concerns on other embodiment. Furthermore, the functional block diagram of a base station and a mobile station when performing uplink multiband communication by dual connectivity in the radio | wireless communications system which concerns on other embodiment. Explanatory drawing which shows an example of a mode which is performing downlink and uplink multiband communication using mobile stations, such as a smart phone which has started the application of voice communication and data download simultaneously with the same wireless communication system as FIG. . Explanatory drawing which shows an example of a mode that downlink multiband communication is performed using mobile stations, such as a smart phone which is starting simultaneously the application of the automatic driving | running | working of a motor vehicle, and in-vehicle entertainment with the same radio | wireless communications system as FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram illustrating an example of a plurality of frequency bands used in a mobile communication system. As shown in FIG. 1, for example, in a wide area cell (macro cell) 101, frequency bands f1 to f5 (for example, 700 MHz band, 900 MHz band, 1.5 GHz band, 1.7 GHz band, 2.1 GHz, 2.1 GHz) Band) is used. Further, in the mid-range cell (microcell) 102, frequency bands f6 and f7 (for example, 2.5 GHz band and 3.5 GHz band) of 2 to 4 GHz are used. Further, in the narrow cell 103 (nanocell) 103, frequency bands f8 and f9 (for example, 4 GHz band and 28 GHz band) of 4 GHz or more are used. In the frequency bands f1 to f5, a communication system of FDD-LTE (Frequency Division Duplex-Long Term Evolution) is mainly used, and in the frequency bands f6 and f7, TD-LTE (Time Division-Long Term) is mainly used. Evolution) is used. Further, in the frequency bands f8 and f9 on the higher frequency side, the use of a fifth-generation radio communication system that is regarded as a future mobile communication system is also being studied. In an example of multiband communication, when a mobile station (UE) can transmit and receive signals to and from a base station (eNB: eNodeB) of multiple frequency bands, the downlink and uplink between the base station and the mobile station Communication is performed using two or more frequency bands of the plurality of frequency bands at the same time for each of the two-way communications using. Further, in an example of multiband communication, communication can be performed using only two or more frequency bands among the plurality of frequency bands only for downlink communication between the base station and the mobile station. Further, in an example of multiband communication, communication can be performed using only two or more frequency bands among the plurality of frequency bands only for uplink communication between the base station and the mobile station.

  FIG. 2 is an explanatory diagram showing an example of arrangement of base stations in the mobile communication system according to the present embodiment. In the example shown in FIG. 2, the macro cell base station 20 that performs radio communication using the FDD-LTE communication system, the micro cell base station 30 that performs radio communication using the TD-LTE communication system, and the fifth generation radio communication system of the mobile communication system. A compliant nanocell base station (hereinafter referred to as “5G base station”) 40 is disposed. The macrocell base stations 20 are arranged so that the macrocells 20A, which are wireless communication areas of the plurality of macrocell base stations 20, partially overlap each other. In addition, the microcell base station 30 is arranged so that at least a part of the microcell 30 </ b> A that is a wireless communicable area overlaps with the macrocell 20 </ b> A of the macrocell base station 20. Further, the 5G base station 40 is arranged so that at least a part of the nanocell 40A, which is the wireless communicable area, overlaps with the macrocell 20A. In addition, a cell installed inside a macro cell, such as a micro cell or a nano cell, may be collectively referred to as a small cell.

  The base station 60 in the figure is a base station in which the macro cell base station 20 and the micro cell base station 30 are arranged at the same position, and both the macro cell base station 20 and the micro cell base station 30 are used. The macrocell 20A and the microcell 30A are formed concentrically around the center. Therefore, the mobile station 10A located in both the macro cell 20A and the micro cell 30A can simultaneously use a frequency band (eg, f1) used by the macro cell 20A and a frequency band (eg, f6) used by the micro cell 30A. Communication can be performed. A base station 65 in the figure is a base station in which the macro cell base station 20 and the 5G base station 40 are arranged at the same position, and the macro cell base station 20 and the 5G base station 40 are used together. Thus, the macrocell 20B and the nanocell 40B are formed concentrically. Accordingly, the mobile station 10B located in both the macro cell 20B and the nano cell 40B performs multiband communication using the frequency band (eg, f1) used by the macro cell 20B and the frequency band (eg, f8) used by the nano cell 40B at the same time. It can be carried out.

  Further, focusing on the macro cell 20C and the micro cell 30C in the figure, the mobile station 10C located in both the macro cell 20C and the micro cell 30C uses the frequency band (eg, f1) used by the macro cell 20C and the micro cell 30C. Multiband communication using the same frequency band (for example, f6) can be performed. As described above, even when the macro cell base station 20 forming the macro cell 20C and the micro cell base station 30 forming the micro cell 30C are geographically separated from each other, multiband communication can be performed. Similarly, paying attention to the macro cell 20D and the nano cell 40D in the figure, the mobile station 10D located in both the macro cell 20D and the nano cell 40D has a frequency band (for example, f1) used by the macro cell 20D and a frequency used by the nano cell 40D. Multiband communication using a band (for example, f8) at the same time can be performed. As described above, even when the macro cell base station 20 forming the macro cell 20D and the 5G base station forming the nano cell 40D are geographically separated from each other, multiband communication can be performed.

  In the example of FIG. 2, the multiband communication between the macrocell base station and the microcell base station and the multiband communication between the macrocell base station and the 5G base station have been described. Is possible. For example, multi-band communication between macro cell base stations such as multi-band communication between a macro cell base station using the frequency band f1 and a macro cell base station using the frequency band f2, a micro cell base station using the frequency band f6, Multiband communication between microcell base stations, such as multiband communication between microcell base stations using frequency band f7, or between 5G base stations using frequency band f8 and 5G base stations using frequency band f9 Multiband communication between 5G base stations such as multiband communication is also possible. This patent is applicable not only to the cell configuration shown in FIG. 2 but also to all cell configurations that can communicate simultaneously with base stations of a plurality of frequency bands.

  As shown in FIG. 2, in an environment where macrocells, microcells, and nanocells in which a part of cells overlaps are formed and different frequency bands are used for wireless communication in each cell, in this embodiment, each cell overlaps. A base station located in the area can perform multiband communication on the downlink and / or uplink between the base station and the mobile station. In this multiband communication, for example, in the downlink, the base station distributes packets of data to be transmitted to a plurality of frequency bands and transmits them to the mobile station. This packet distribution is performed based on fairness between mobile stations and radio channel conditions (radio transmission line quality and radio wave intensity) as considered by a conventional single frequency scheduler, or load distribution between frequency bands. It is possible to go based on.

However, as a result of intensive studies by the present inventor, it has been found that there is a possibility that the communication quality may be lowered even if packets are distributed in consideration of such fairness, load distribution, and radio channel conditions.
For example, when distributing packets based on fairness between mobile stations, radio channel conditions, and load distribution between frequency bands, the characteristics of each frequency band cannot be utilized. Specifically, low frequency bands such as f1 to f5 can cover a wide area, so that handover during movement is reduced and effective for communication of moving terminals, but the usable frequency width is in a high frequency band. Since it is relatively narrow, the throughput is low. On the other hand, in a high frequency band such as f8 or f9, the usable frequency width is wide and the throughput is high, but the wide area cannot be covered, and handovers occur frequently and communication quality deteriorates. Therefore, mobile stations that use low-throughput applications (mail, telephone, etc.) during high-speed movement are suitable for low-frequency bands, but are stationary and use high-throughput applications (high-definition video viewing, content download, etc.). High frequency bands are suitable for mobile stations. Therefore, when distributing packets based on load distribution between frequency bands, fairness between mobile stations, and radio channel conditions of each frequency band, mobile stations that are moving at high speed can be assigned to high frequency bands, and high-throughput applications By allocating to the low frequency band, the communication quality may deteriorate.
Also, for example, when packets are distributed based on load distribution between frequency bands, fairness between mobile stations, and radio channel conditions of each frequency band and single frequency band, TCP throughput may deteriorate. Specifically, in an application that performs communication using TCP, if packets that belong to the same TCP session are assigned to multiple bands and communication is performed, packets assigned to the low frequency band have a low throughput, and therefore high frequency. There is a possibility that the amount of delay will be larger than the packet assigned to the band, the packet assigned to the low frequency band arrives later than the packet assigned to the high frequency band, and the arrival order of the packets is reversed. TCP throughput may deteriorate.

  Therefore, in the present embodiment, it is possible to suppress deterioration in communication quality when packet distribution is performed based only on load distribution between frequency bands, fairness between mobile stations, and radio channel conditions of each frequency band and single frequency band. Therefore, at least one information of user context information or session information of packet communication is acquired, and transmitted and received between the base station and the mobile station based on at least one information of the user context information and the session information. The downlink and uplink packets are distributed to a plurality of different frequency bands.

  The user context information includes presence information of a user who uses the mobile station 10, position information of the mobile station 10, movement speed information of the mobile station 10, and an application related to an activation state of an application using packet communication by the mobile station 10. Information, usage environment information of the mobile station 10, behavior information before or after the mobile station 10 is used, date information or time zone information using the mobile station 10, and the mobile station 10 is used. It includes at least one piece of information on the user's health information, information on the psychological state of the user who is using the mobile station 10, and weather information when using the mobile station 10.

  The presence information is information indicating the current state of the user who uses the mobile station 10, and can identify, for example, whether it is during a meeting, during a break, during normal business, out of office, or at home. It is. The location information of the mobile station 10 includes, for example, information on longitude and latitude where the mobile station 10 is located (GPS information), and area information that can identify in which area the mobile station 10 is located in the countryside, suburb, city, etc. Etc. The moving speed information of the mobile station 10 is information that can identify the type of moving speed such as high speed movement, low speed movement, and stationary. Further, the application information is information that can identify an application accompanied by communication of various communication amounts activated in the mobile station. For example, as an application to be identified, an application that acquires information from various sensors or automobiles by mail, telephone (VoLTE: Voice over Long Term Evolution), IoT (Internet of Things), which has a relatively small amount of communication, or relatively communication Applications include WEB / SNS usage, surveillance cameras, high-definition video (4K / 8K) viewing, content download, and factory automation. The usage environment information of the mobile station 10 is information for identifying the type of the mobile station 10, the type of the communication line, and the like. The time zone information using the mobile station 10 is information that can identify, for example, midnight, morning, afternoon, and the like.

  In the present embodiment, based on the various user context information, in the case of a communication packet with a large amount of traffic, a frequency band having a relatively high communication speed or a large communication capacity (for example, a high frequency band) among a plurality of frequency bands. ), And in the case of a communication packet with a small communication volume, the packet is distributed to a frequency band (for example, a low frequency band) having a low communication speed or a small communication capacity among a plurality of frequency bands. By this packet distribution, it is possible to select a frequency band that is optimal for the user's usage mode and usage application, so that the communication quality experienced by the user can be improved.

  In addition, the session information identifies TCP / IP communication performed by accessing the communication network from the mobile station 10 via the base stations 20, 30, 40, 60, 65 and connecting to a server or node to establish a session. The session can be identified by the destination address, source address, destination port number, source port number, etc. included in the IP header and TCP header. In this embodiment, based on the session information, packets are grouped for each session and distributed to frequency bands. This packet distribution prevents packets included in the same session from being transmitted and received in multiple different frequency bands, so even if a packet communication error or packet communication delay occurs, the effect is minimized. Therefore, it is possible to suppress deterioration in communication quality in multiband communication.

  In addition, in at least one of the user context information and session information and fairness between frequency bands in a plurality of frequency bands, in a plurality of mobile stations 10 connected to the base stations 20, 30, 40, 60, 65 Packets transmitted / received between the base station and the mobile station 10 based on fairness among mobile stations, load distribution between frequency bands in a plurality of frequency bands, and at least one information of radio channel conditions in each frequency band May be distributed to a plurality of frequency bands.

  FIG. 3 is a functional block diagram of a base station and a mobile station focusing on a communication layer structure when downlink multiband communication is performed by carrier aggregation in a mobile communication system according to an embodiment of the present invention. In the example of FIG. 3, since the macro cell base station 20 and the micro cell base station 30 are arranged at the same place like the base station 60 in FIG. 2, the macro cell signal and the micro cell signal are transmitted and received from the same place. This is an example in which multiband communication is performed by carrier aggregation in a configuration in which the macro cell 20A and the micro cell 30A are formed concentrically. Here, with carrier aggregation, a physical layer (PHY layer) is individually provided for each of a plurality of different frequency bands, and packets are distributed in a scheduler of a media access control layer (MAC layer). This is a wireless communication system in which radio waves in the frequency band are simultaneously operated and data is distributed and transmitted as one communication line.

  In the example of FIG. 3, a case where the number of different frequency bands used for multiband communication between the base station 60 and the mobile station 10 is two will be described. However, the number of frequency bands used for multiband communication is described. May be 3 or more. The same applies to the embodiments shown in FIGS.

  In FIG. 3, the mobile station 10 and the base station 60 respectively include data convergence protocol layers (PDCP layers) 111 and 121, radio link control layers (RLC layers) 112 and 122, media access control layers (MAC layers) 113 and 123, And a multi-layer communication layer structure including physical layers (PHY layers) 114 and 124.

  The PDCP layers 111 and 121 perform processing such as data compression, encryption arrangement expansion, and decryption. The RLC layers 112 and 122 perform processing such as data division, combination, order control, and retransmission (ARQ: Automatic Repeat-Request). The MAC layers 113 and 123 perform processing such as data transmission scheduling, multiplexing, and retransmission (HARQ: Hybrid Automatic Repeat Request). The PHY layers 114 and 124 perform processing such as modulation, demodulation, and encoding of high-frequency transmission / reception signals transmitted / received between the mobile station 10 and the macrocell base station 20 and the microcell base station 30. The PHY layers 114 and 124 function as a wireless communication unit that wirelessly communicates between the mobile station 10 and the macrocell base station 20 and the microcell base station 30.

  The PHY layer 114 of the mobile station 10 includes a PHY layer (band 1) 114a as a first physical layer using the first frequency band (band 1) and a second physical layer using the second frequency band (band 2). As a PHY layer (band 2) 114b. The PHY layer 124 of the base station 60 includes a PHY layer (band 1) 124a as a physical layer of the microcell base station 30 using the first frequency band (band 1), and a second frequency band (band 2). And a PHY layer (band 2) 124b as a physical layer of the macrocell base station 20 using the. Then, wireless communication is performed between the PHY layer (band 1) 114a of the mobile station 10 and the PHY layer (band 1) 124a of the base station 60, and the PHY layer (band 2) 114b of the mobile station 10 and the PHY of the base station 60 Wireless communication is performed with the layer (band 2) 124b. As a result, the base station 60 performs multi-band communication using the band 1 and the band 2 with the mobile station 10 located within the range of both the macro cell 20A and the micro cell 30A formed by the base station 60. Can do.

  In addition, the base station 60 includes a packet analysis unit 125 as a session information acquisition unit and a scheduler 126 as a communication schedule management unit. The packet analysis unit 125 analyzes the packet P to be transmitted on the downlink and acquires session information of the packet P. In the example of FIG. 3, the packet analysis unit 125 is provided in the PDCP layer 121. In addition, the scheduler 126 manages the downlink communication schedule of the base station 60 that functions as the macro cell base station 20 and the micro cell base station 30. In the example of FIG. 3, the scheduler 126 is provided in the MAC layer 123, controls the PHY layer (band 1) 124a and the PHY layer (band 2) 124b, and distributes and transmits packets to band 1 and band 2. .

  The hardware of the mobile station 10 and the base station 60 (the macro cell base station 20 and the micro cell base station 30) used in the mobile communication system having the above configuration includes, for example, an antenna, a transmission amplifier, a reception amplifier, a radio signal processing unit, a base A band signal processing unit, a computer device, and the like are included. Of these hardware configurations, an antenna, a transmission amplifier, and a reception amplifier correspond to the above-described wireless communication unit. The computer device is composed of, for example, a microcomputer, functions as the above-described control unit, and controls each unit based on a predetermined control program incorporated in advance. In particular, the computer device controls a wireless signal processing unit and a baseband signal processing unit based on a predetermined control program, thereby, for example, a plurality of communication layer structures such as the PDCP layer, the RLC layer, the MAC layer, and the PHY layer described above. It processes data and signals sent and received via

  In the wireless communication system according to the present embodiment, the mobile station 10 includes a sensor 115 as a user context information acquisition unit and an application information acquisition unit 116 in order to acquire the above-described user context information. As the sensor 115, for example, a clock unit, a GPS reception unit, an attitude detection unit (acceleration sensor), a camera unit, and an audio reception unit can be used. Further, as the application information acquisition unit 116, for example, an application execution management unit that constructs an application execution environment and manages the execution of the application can be used.

  The scheduler 126 provided in the MAC layer of the base station 60 receives the user context information from the mobile station 10 and also receives the session information of the packet from the packet analysis unit 125, and the PHY layer (band 1) 114a of the mobile station 10 And downlink PHY channel information from PHY layer (band 2) 114b. Based on these pieces of information, the scheduler 126 distributes the packet P to be transmitted on the downlink to the optimum band (band 1 or band 2). Here, the user context information may be transmitted from the mobile station 10 to the scheduler 126 using, for example, uplink IP packet communication or RRC (Radio resource control protocol) communication.

  Radio signals of downlink packets transmitted from the PHY layer 124a (band 1) functioning as the microcell base station 30 of the base station 60 and the PHY layer 124b (band 2) functioning as the macrocell base station 20 are respectively mobile stations. After being received by 10 PHY layers (bands 1 and 2) 114 a and b, the packet P is restored by the MAC layer 113, the RLC layer 112, and the PDCP layer 111.

Tables 1 and 2 each show an example of selecting an optimum band based on the above-described user context information. The data table indicating the correspondence relationship between Table 1 and Table 2 is stored in, for example, a storage unit in the scheduler 126 that performs packet distribution.

  Table 1 is a table for explaining an example of an optimum band according to the user's state. As shown in Table 1, when the user is moving at high speed or located in the countryside, the optimum band is easy to form a wide-area cell, has a relatively small number of handovers, and has high resistance to high speed 900 MHz The following low frequency band. When the user is moving at a low speed or in a city, the optimum band is 2.5 to 6 GHz with a high communication speed (throughput) or a large communication capacity. When the user is stationary, the optimum band is a high frequency band of 4 to 28 GHz where the communication speed (throughput) is higher or the communication capacity is larger.

Table 2 is a table for explaining an example of the optimum band corresponding to the application used by the user. As shown in Table 2, when the application used by the user is a calling application such as VoLTE, or an application that communicates with a sensor or car using IoT, the communication speed (throughput) is about several kilobit seconds and is relatively low. However, since wide coverage and resistance to high-speed movement are required, the optimum band is a low frequency band of 900 MHz or less. In addition, in the case of an application using Web / SNS or an application of a monitoring camera, a throughput of several megabits per second is necessary, and thus an optimum band is 2.5 to 6 GHz. In addition, for 4K / 8K video viewing and factory automation applications, a throughput of several tens of megabits per second and an ultra-low delay of about several tens of microseconds are required, so the fifth generation wireless communication technology is necessary and optimal. The band is a high frequency band of 4 to 28 GHz.

  FIG. 4 is an explanatory diagram for describing session information of packets transmitted and received in the wireless communication system of the present embodiment. As described above, a plurality of packets P1 to P6 sent from the core network of the mobile communication network to the base station 60 (the macro cell base station 20 and the micro cell base station 30) are received by the packet analysis unit 125 in the packet header information P1h to Session information is analyzed based on P6h. In the example shown in FIG. 4, the packets P1 to P6 are divided into a TCP (session 1) 101 group and a TCP (session 2) 102 group based on the packet analysis result. Packets P1, P2, and P6 of TCP (session 1) 101 are transmitted from the PHY layer (band 1) 124a of the microcell base station 30, and packets P3, P4, and P5 of the group of TCP (session 2) 102 are macro cell base stations. Sent from 20 PHY layers (band 2) 124b. Thus, when an error or delay occurs in one of the bands 1 and 2, it is possible to prevent the communication quality of a session communicating using the other band from being affected.

  FIG. 5 shows packet distribution for distributing downlink packets to mobile stations of a plurality of users 1, 2, 3 in a radio communication system according to the present embodiment to radio resources of a plurality of frequency bands (bands 1, 2). It is explanatory drawing for demonstrating an example. In the example of FIG. 5, the scheduler 126 of the base station 60 causes the packet PU11-1 to PU11-3 of the data 11 to the first user 1, the packet PU12-1 of the data 12 to the second user 2, and the third Each of the packets PU13-1 to PU13-4 of the data 13 to the user 3 in the user context information, session information, fairness information between users and between bands, radio channel (bands 1 and 2) information, and load distribution information Is assigned to band 1 and band 2. For example, of the three packets of data 11 to the first user, two packets of the packets PU11-1 and PU11-3 are distributed to the band 1 radio resource, and the other one packet PU11-2 is allocated to the band 2 It is distributed to radio resources.

  As described above, according to the embodiment of FIGS. 3 to 5, the base station 60 that is also used as the macrocell base station 20 and the microcell base station 30, and the overlapping area of the macrocell 20 </ b> A and the microcell 30 </ b> A formed by the base station 60. It is possible to suppress a decrease in communication quality when downlink multiband communication is performed using a plurality of frequency bands simultaneously by carrier aggregation with a mobile station 10A located in the area.

  FIG. 6 is a functional block diagram of a base station and a mobile station focusing on a communication layer structure when downlink multiband communication is performed by dual connectivity in a wireless communication system according to another embodiment. In the example of FIG. 6, the macro cell base station 20 and the micro cell base station 30 are arranged at the same place like the base station 60 in FIG. 2, and the macro cell signal and the micro cell signal are transmitted and received from the same place. This is an example in which multi-band communication is performed by dual connectivity in a configuration in which the macro cell 20A and the micro cell 30A are formed concentrically. Here, dual connectivity means that a radio link control layer (RLC layer), a media access control layer (MAC layer), and a physical layer (PHY layer) are individually provided for each of a plurality of different frequency bands, and a data convergence protocol is provided. This is a wireless communication system that distributes and transmits data as one communication line by simultaneously operating radio waves in a plurality of frequency bands by distributing packets in a bearer splitter of the layer (PDCP layer). In FIG. 6, the same reference numerals are given to portions common to those in FIG. 3 described above, and description thereof is omitted.

  In FIG. 6, the base station 60 includes a PDCP layer 121, two sets of RLC layers 122a, b, MAC layers 123a, b and PHY layers (bands 1, 2) 124a, b provided for the bands 1 and 2, respectively. A multi-layered communication layer structure. The PDCP layer 121 is provided with a bearer splitter 127 that distributes packets in addition to the packet analysis unit 125. Further, schedulers 126a and 126b are provided in the MAC layers 123a and b. The first set of RLC layer 122a, MAC layer 123a and PHY layer (band 1) 124a in the figure correspond to the microcell base station 30, and the second set of RLC layer 122b, MAC layer 123b and PHY layer (band 2). 124 b corresponds to the macrocell base station 20.

  In addition, the mobile station 10 includes a PDCP layer 111, two sets of RLC layers 112a and 112b provided for each of the bands 1 and 2, MAC layers 113a and 113b, and PHY layers (bands 1 and 2) 114a and b, and sensors. 115 and an application information acquisition unit 116.

  The bearer splitter 127 acquires user context information from the sensor 115 and the application information acquisition unit 116 of the mobile station 10 and acquires session information of the packet P from the packet analysis unit 125. Based on this information, the bearer splitter 127 refers to the data table of Table 1 or Table 2 stored in the storage unit in the bearer splitter 127, for example, and transmits the packet to the RLC layer 122a of Band 1 or Band 2 To the RLC layer 122b. The schedulers 126a and 126b in the MAC layers 123a and 123b acquire the radio channel information from the PHY layers (bands 1 and 2) 114a and 114b of the mobile station 10, respectively. The distributed packets are transmitted from the PHY layers (bands 1 and 2) 124a and b, respectively.

  The radio signals of the downlink packets transmitted from the micro cell base station 30 (PHY layer (band 1) 124a) and the macro cell base station 20 (PHY layer (band 2) 124b) of the base station 60 are After being received by the PHY layers (bands 1 and 2) 114a and b, the packets are restored to the packet P by the MAC layers 113a and 113b, the RLC layers 112a and 112b, and the PDCP layer 111.

  As described above, according to the embodiment of FIG. 6, the base station 60 that is also used as the macrocell base station 20 and the microcell base station 30 and the overlapping area of the macrocell 20A and the microcell 30A formed by the base station 60 are located. It is possible to suppress deterioration of communication quality when performing downlink multiband communication using a plurality of frequency bands simultaneously by dual connectivity with the mobile station 10A.

  FIG. 7 is a functional block diagram of a base station and a mobile station paying attention to a communication layer structure when downlink multiband communication is performed by carrier aggregation in a wireless communication system according to still another embodiment. The example of FIG. 7 is for the case where multiband communication is performed by carrier aggregation in a configuration in which a macro cell signal and a micro cell signal are transmitted and received from geographically different locations, such as the macro cell 20C and the micro cell 30C in FIG. It is an example. In the example of FIG. 7, unlike the carrier aggregation radio communication system described with reference to FIG. 3 described above, multiband communication is performed using a C-RAN configuration using the centralized base station 50. In the C-RAN configuration, the baseband unit of the macrocell base station 20 and the microcell base station 30 is installed in the centralized base station 50. Then, signals are transmitted to and received from the macro cell 20C by a high frequency unit (RF unit) 129b connected from the centralized base station 50 via a transmission cable (for example, an optical fiber cable) 128b. In addition, signals are transmitted to and received from the microcell 30C by a high frequency unit (RF unit) 129a connected from the centralized base station 50 via a transmission cable (for example, an optical fiber cable) 128a. In FIG. 7, the same reference numerals are given to portions common to those in FIG. 3 described above, and description thereof is omitted.

  In FIG. 7, the centralized base station 50 includes a PDCP layer 121, an RLC layer 122, a MAC layer 123, PHY layers (bands 1 and 2) 124 a and b, a packet analysis unit 125, and a scheduler 126. An RF unit (band 1) 129a of the microcell base station 30 is connected to the PHY layer (band 1) 124a of the centralized base station 50 via a transmission cable (optical fiber cable) 128a. Further, the RF section (band 2) 129b of the macrocell base station 20 is connected to the PHY layer (band 2) 124b of the centralized base station 50 via a transmission cable (optical fiber cable) 128b.

  The scheduler 126 provided in the MAC layer 123 of the centralized base station 50 transmits the packet P to the PHY layer (band 1) based on the session information received from the packet analysis unit 125, the user context information acquired from the mobile station 10, and the radio channel information. 2) Assign to 124a and b. The packet distributed to the PHY layer (band 1) 124a is transmitted from the RF unit (band 1) 129a toward the PHY layer (band 1) 114a of the mobile station 10. Further, the packet distributed to the PHY layer (band 2) 124b is transmitted from the RF unit (band 2) 129b to the PHY layer (band 2) 114b of the mobile station 10.

  As described above, according to the embodiment of FIG. 7, the central base station 50 that performs baseband processing between the macrocell base station 20 and the microcell base station 30 and the central base station 50 is formed via the RF units 129a and b. To suppress deterioration in communication quality when downlink multiband communication is performed simultaneously with a mobile station 10C located in an overlapping area of the macrocell 20C and the microcell 30C using a plurality of frequency bands by carrier aggregation. Can do.

  FIG. 8 is a functional block diagram of a base station and a mobile station paying attention to a communication layer structure when performing downlink multiband communication by dual connectivity in a wireless communication system according to still another embodiment. The example of FIG. 8 is a case in which multi-band communication is performed by dual connectivity in a configuration in which a macro cell signal and a micro cell signal are transmitted and received from geographically different locations like the macro cell 20C and the micro cell 30C in FIG. It is an example. In the example of FIG. 8, unlike the dual connectivity wireless communication system described with reference to FIG. 6 described above, multiband communication is performed using a C-RAN configuration using the centralized base station 50. In the C-RAN configuration, the baseband unit of the macrocell base station 20 and the microcell base station 30 is installed in the centralized base station 50. Then, signals are transmitted to and received from the macro cell 20C by a high frequency unit (RF unit) 129b connected from the centralized base station 50 via a transmission cable (for example, an optical fiber cable) 128b. In addition, signals are transmitted to and received from the microcell 30C by a high frequency unit (RF unit) 129a connected from the centralized base station 50 via a transmission cable (for example, an optical fiber cable) 128a. In FIG. 8, portions common to those in FIG. 6 described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 8, the centralized base station 50 is provided with a PDCP layer 121, RLC layers 122a and b, MAC layers 123a and b, and PHY layers (bands 1 and 2) 124a and b. The PDCP layer 121 is provided with a bearer splitter 127 that distributes the packets P in addition to the packet analysis unit 125. Furthermore, schedulers 126a and 126b are provided in the MAC layers 123a and b, respectively. An RF unit (band 1) 129a of the microcell base station 30 is connected to the PHY layer (band 1) 124a of the centralized base station 50 via a transmission cable (optical fiber cable) 128a. Further, the RF section (band 2) 129b of the macrocell base station 20 is connected to the PHY layer (band 2) 124b of the centralized base station 50 via a transmission cable (optical fiber cable) 128b.

  The bearer splitter 127 provided in the PDCP layer 121 of the centralized base station 50 distributes the packet P to the RLC layers 122a and 122b based on the session information received from the packet analysis unit 125 and the user context information acquired from the mobile station 10. . The packet distributed to the RLC layer 122a is transmitted from the RF unit (band 1) 129a to the PHY layer (band 1) 114a of the mobile station 10 via the MAC layer 123a and the PHY layer (band 1) 124a. Is done. Further, the packet distributed to the RLC layer 122b is transmitted from the RF unit (band 2) 129b to the PHY layer (band 2) 114b of the mobile station 10 via the MAC layer 123b and the PHY layer (band 2) 124b. .

  As described above, according to the embodiment of FIG. 8, the concentrated base station 50 that is also used as the macrocell base station 20 and the microcell base station 30, and the macrocell 20C formed from the concentrated base station 50 via the RF units 129a and b. In addition, it is possible to suppress deterioration in communication quality when performing downlink multiband communication using a plurality of frequency bands simultaneously by dual connectivity between the mobile station 10 located in the overlapping area of the microcell 30C. .

  FIG. 9 is a functional block diagram of a base station and a mobile station focusing on a communication layer structure when downlink multiband communication is performed by dual connectivity in a wireless communication system according to still another embodiment. The example of FIG. 9 is a case in which multi-band communication is performed by dual connectivity in a configuration in which a macro cell signal and a micro cell signal are transmitted and received from geographically different locations, such as the macro cell 20C and the micro cell 30C in FIG. It is an example. In the example of FIG. 9, unlike the dual connectivity wireless communication system described with reference to FIG. 8, the RLC layer, the MAC layer, and the PHY layer corresponding to the PDCP layer and the band 2 are arranged in the macro cell base station 20, An RLC layer, a MAC layer, and a PHY layer corresponding to band 1 are arranged in the microcell base station 30. In FIG. 9, parts common to those in FIG. 8 are given the same reference numerals, and descriptions thereof are omitted.

  As shown in FIG. 9, the macrocell base station 20 is provided with a PDCP layer 121 common to the bands 1 and 2 and an RLC layer 122b, a MAC layer 123b, and a PHY layer (band 2) 124b corresponding to the band 2. ing. The PDCP layer 121 is provided with a bearer splitter 127 that distributes the packets P in addition to the packet analysis unit 125. Furthermore, the scheduler 126b is provided in the MAC layer 123b. On the other hand, the microcell base station 30 is provided with an RLC layer 122a, a MAC layer 123a and a PHY layer (band 1) 124a corresponding to band 1, and a scheduler 126a is provided in the MAC layer 123a. The RLC layer 122 a is provided with a transmission cable (optical fiber cable) 130 capable of high-speed transmission connected to the PDCP layer 121 of the macrocell base station 20. The connection between the RLC layer 122a and the PDCP layer 121 of the macrocell base station 20 is not limited to the wired transmission cable (optical fiber cable) 130, and wireless communication may be used.

  The bearer splitter 127 of the macrocell base station 20 transmits the packet P based on the session information received from the packet analysis unit 125 and the user context information acquired from the mobile station 10 to the RLC layer 122a of the microcell base station 30 and the RLC of its own station. Sort to layer 122b. A packet distributed to the RLC layer 122a of the microcell base station 30 via the transmission cable (for example, an optical fiber cable) 130 is transferred from the PHY layer (band 1) 124a to the PHY layer of the mobile station 10 via the MAC layer 123a. (Band 1) Transmitted toward 114a. Further, the packet distributed to the RLC layer 122b of the macrocell base station 20 is transmitted from the PHY layer (band 2) 124b to the PHY layer (band 2) 114b of the mobile station 10 via the MAC layer 123b.

  As described above, according to the embodiment of FIG. 9, the macro cell base station 20 and the micro cell base station 30, and the mobile station 10 located in the overlapping area of the macro cell 20C and the micro cell 30C formed by 20 and 30 in each base station. With the dual connectivity, it is possible to suppress deterioration in communication quality when performing downlink multiband communication using a plurality of frequency bands simultaneously.

  FIG. 10 is a functional block diagram of a base station and a mobile station focusing on a communication layer structure when uplink multiband communication is performed by carrier aggregation in a wireless communication system according to still another embodiment. In the example of FIG. 10, like the example of FIG. 3, the macro cell base station 20 and the micro cell base station 30 are arranged at the same place as the base station 60 in FIG. 2, and the macro cell signal and the micro cell signal are arranged. Are transmitted and received from the same location, and in the configuration in which the macro cell 20A and the micro cell 30A are formed concentrically, this is an example of performing multiband communication by carrier aggregation. The wireless communication system according to the present embodiment is an example of uplink communication, unlike the wireless communication system described with reference to FIG. 3, and a packet analysis unit is provided on the mobile station 10 side. In FIG. 10, the same reference numerals are given to portions common to those in FIG. 3 described above, and description thereof is omitted.

  As shown in FIG. 10, the mobile station 10 is provided with a packet analysis unit 117, which analyzes session information of a packet P transmitted on the uplink. In addition, a scheduler 126 is provided in the MAC layer 123 of the macro cell base station 20 and the micro cell base station 30, and session information is transmitted from the mobile station 10 in addition to user context information and radio channel information. Based on the user context information, radio channel information, and session information received from the mobile station 10, the scheduler 126 creates schedule instruction information for distributing packets P in the mobile station 10, and transmits the schedule instruction information to the mobile station 10. The mobile station 10 distributes the packet P to the PHY layers (bands 1 and 2) 114a and 114b in the MAC layer 113 based on the schedule instruction information received from the scheduler 126. Then, the packets distributed to the PHY layer (band 1) 114a are transmitted to the PHY layer (band 1) 124a of the microcell base station 30 via the uplink. Further, the packet distributed to the PHY layer (band 2) 114b is transmitted to the PHY layer (band 2) 124b of the macrocell base station 20 through the uplink. Thereby, uplink multiband communication by the optimal distribution of the packet P can be performed between the mobile station 10 and the macrocell base station 20 and the microcell base station 30.

  As described above, according to the embodiment of FIG. 10, the base station 60 that is also used as the macrocell base station 20 and the microcell base station 30, and the overlapping area of the macrocell 20 </ b> A and the microcell 30 </ b> A formed by the base station 60 are located. Decrease in communication quality when performing uplink multiband communication with a mobile station 10A using a plurality of frequency bands simultaneously by carrier aggregation can be suppressed.

  FIG. 11 is a functional block diagram of a base station and a mobile station focusing on a communication layer structure when uplink multiband communication is performed by dual connectivity in a wireless communication system according to still another embodiment. In the example of FIG. 11, like the base station 60 in FIG. 6, the macro cell base station 20 and the micro cell base station 30 are arranged at the same place as in the base station 60 in FIG. Is an example in which multi-band communication is performed by dual connectivity in a configuration in which the macro cell 20A and the micro cell 30A are formed concentrically. The wireless communication system according to this embodiment is an example of uplink communication, unlike the wireless communication system described with reference to FIG. 6, and a packet analysis unit and a bearer splitter are provided on the mobile station 10 side. . In FIG. 11, the same reference numerals are given to portions common to those in FIGS. 6 and 3 described above, and description thereof is omitted.

  As shown in FIG. 11, the mobile station 10 is provided with a packet analysis unit 117 and a bearer splitter 118 in the PDCP layer 111. The bearer splitter 118 of the mobile station 10 acquires user context information from the sensor 115 and the application information acquisition unit 116 and acquires session information of the packet P from the packet analysis unit 117. The bearer splitter 118 distributes the packet P to the RLC layers 112a and 112b based on these pieces of information. Then, the packet distributed to the RLC layer 112a is transmitted via the MAC layer 113a from the PHY layer (band 1) 114a to the PHY layer (band 1) 124a of the microcell base station 30 in the uplink. Further, the packet distributed to the RLC layer 112b is transmitted from the PHY layer (band 2) 114b via the MAC layer 113b to the PHY layer (band 2) 124b of the macro cell base station 20 in the uplink.

  As described above, according to the embodiment of FIG. 11, the base station 60 that is also used as the macrocell base station 20 and the microcell base station 30, and the overlapping area of the macrocell 20 </ b> A and the microcell 30 </ b> A formed by the base station 60 are located. It is possible to suppress deterioration in communication quality when performing uplink multi-band communication with a mobile station 10A using a plurality of frequency bands simultaneously by dual connectivity.

  FIG. 12 is a functional block diagram of a base station and a mobile station paying attention to a communication layer structure when uplink multiband communication is performed by carrier aggregation in a wireless communication system according to another embodiment. In the example of FIG. 12, similarly to the example of FIG. 7, in the configuration in which the macro cell signal and the micro cell signal are transmitted and received from geographically different locations, such as the macro cell 20C and the micro cell 30C in FIG. This is an example of performing multiband communication. The radio communication system according to the present embodiment is an example of uplink communication, unlike the radio communication system described with reference to FIG. 7, and a packet analysis unit is provided on the mobile station 10 side. In FIG. 12, the same reference numerals are given to portions common to the above-described FIGS. 7 and 3, and description thereof is omitted.

  As shown in FIG. 12, the mobile station 10 is provided with a packet analysis unit 117, which analyzes session information of the packet P transmitted on the uplink. In addition, a scheduler 126 is provided in the MAC layer 123 of the centralized base station 50, and session information is transmitted from the mobile station 10 in addition to user context information and radio channel information. Based on the user context information, radio channel information, and session information received from the mobile station 10, the scheduler 126 creates schedule instruction information for distributing packets P in the mobile station 10, and transmits the schedule instruction information to the mobile station 10. Based on the schedule instruction information received from the scheduler 126, the mobile station 10 distributes the packets to the PHY layers (bands 1 and 2) 114 a and 114 b in the MAC layer 113. Then, the packet distributed to the PHY layer (band 1) 114a is transmitted to the RF unit (band 1) 129a of the microcell base station 30 via the uplink. Further, the packet distributed to the PHY layer (band 2) 114b is transmitted to the RF unit (band 2) 129b of the macrocell base station 20 through the uplink. Thereby, uplink multiband communication by the optimal distribution of the packet P can be performed between the mobile station 10 and the macrocell base station 20 and the microcell base station 30.

  As described above, according to the embodiment of FIG. 12, the concentrated base station 50 that is also used as the macrocell base station 20 and the microcell base station 30, and the macrocell 20C formed from the concentrated base station 50 via the RF units 129a and b. In addition, it is possible to suppress deterioration in communication quality when performing uplink multiband communication with a mobile station 10C located in an overlapping area of the microcell 30C by simultaneously using a plurality of frequency bands by carrier aggregation. .

  FIG. 13 is a functional block diagram of a base station and a mobile device focusing on a communication layer structure when performing uplink multiband communication by dual connectivity in a wireless communication system according to still another embodiment. As in the example of FIG. 8, the example of FIG. 13 is a dual connectivity in a configuration in which a macro cell signal and a micro cell signal are transmitted and received from geographically different locations, such as the macro cell 20C and the micro cell 30C in FIG. This is an example of performing multiband communication. The wireless communication system according to the present embodiment is an example of uplink communication, unlike the wireless communication system described with reference to FIG. 8, and a packet analysis unit and a bearer splitter are provided on the mobile station 10 side. In FIG. 13, the same reference numerals are given to portions common to those in FIGS. 8 and 3 described above, and description thereof is omitted.

  As shown in FIG. 13, the mobile station 10 is provided with a packet analysis unit 117 and a bearer splitter 118 in the PDCP layer 111. The bearer splitter 118 of the mobile station 10 acquires user context information from the sensor 115 and the application information acquisition unit 116 and acquires session information of the packet P from the packet analysis unit 117. The bearer splitter 118 distributes the packet to the RLC layers 112a and 112b based on such information. Then, the packet distributed to the RLC layer 112a is transmitted via the MAC layer 113a from the PHY layer (band 1) 114a to the RF unit (band 1) 129a of the microcell base station 30 in the uplink. Further, the packet distributed to the RLC layer 112b is transmitted from the PHY layer (band 2) 114b via the MAC layer 113b to the RF unit (band 2) 129b of the macro cell base station 20 in the uplink.

  As described above, according to the embodiment of FIG. 13, the concentrated base station 50 that is also used as the macrocell base station 20 and the microcell base station 30 and the macrocell 20C formed from the concentrated base station 50 via the RF units 129a and 129b. In addition, it is possible to suppress deterioration in communication quality when performing uplink multiband communication using a plurality of frequency bands simultaneously by dual connectivity with the mobile station 10C located in the overlapping area of the microcell 30C. .

  FIG. 14 is a functional block diagram of a base station and a mobile station focusing on a communication layer structure when uplink multiband communication is performed by dual connectivity in a wireless communication system according to still another embodiment. As in the case of FIG. 9, the example of FIG. 14 is similar to the case of the macro cell 20C and the micro cell 30C in FIG. 2, and in the configuration in which the macro cell signal and the micro cell signal are transmitted and received from geographically different locations, It is an example in the case of performing band communication. The wireless communication system according to the present embodiment is an example of uplink communication, unlike the wireless communication system described with reference to FIG. 9, and a packet analysis unit and a bearer splitter are provided on the mobile station 10 side. In FIG. 14, the same reference numerals are given to portions common to those in FIGS. 9 and 3 described above, and the description thereof is omitted.

  As shown in FIG. 14, the mobile station 10 is provided with a packet analysis unit 117 and a bearer splitter 118 in the PDCP layer 111. The bearer splitter 118 of the mobile station 10 acquires user context information from the sensor 115 and the application information acquisition unit 116 and acquires session information of the packet P from the packet analysis unit 117. The bearer splitter 118 distributes the packet P to the RLC layers 112a and 112b based on these pieces of information. Then, the packet distributed to the RLC layer 112a is transmitted via the MAC layer 113a from the PHY layer (band 1) 114a to the PHY layer (band 1) 124a of the microcell base station 30 in the uplink. Further, the packet distributed to the RLC layer 112b is transmitted from the PHY layer (band 2) 114b via the MAC layer 113b to the PHY layer (band 2) 124b of the macro cell base station 20 in the uplink.

  As described above, according to the embodiment of FIG. 14, the macro cell base station 20 and the micro cell base station 30, and the mobile station 10 located in the overlapping area of the macro cell 20C and the micro cell 30C formed by the base stations 20 and 30 In the meantime, it is possible to suppress deterioration in communication quality when performing uplink multiband communication by using a plurality of frequency bands simultaneously by dual connectivity.

  Note that, in the wireless communication system according to the above-described embodiment, the transmission of the packet is divided into the downlink and the uplink. However, multiband communication may be simultaneously performed in both directions of the downlink and the uplink.

  FIG. 15 performs downlink and uplink multiband communication using a mobile station 10 such as a smartphone that simultaneously activates voice communication and data download applications in the same wireless communication system as FIG. 6 described above. It is explanatory drawing which shows an example of a mode. In the example of FIG. 15, the macro cell base station 20 and the 5G base station 20 are arranged in the same place and the macro cell 20B and the nano cell 40B are formed concentrically. A base station 65 having a dual connectivity function shared with 40 is also provided. In FIG. 15, parts common to those in FIG. 6 described above are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 15, the bearer splitter 127 determines that voice communication and data download are performed based on the user context information and the session information, and the voice communication has a 900 MHz frequency band (band 1) with a low communication speed and a small communication capacity. ) And multi-band communication for distributing packets of each application so as to use a 5 GHz frequency band with a high communication speed and a large communication capacity for data download.

  FIG. 16 shows a state in which downlink multiband communication is performed using an in-vehicle mobile station 10 that simultaneously activates an application for automatic driving of a car and in-car entertainment in a wireless communication system similar to that of FIG. It is explanatory drawing which shows an example. In the example of FIG. 16, as in the example of FIG. 15, the macro cell base station 20 and the 5G base station 40 are arranged in the same place, and the macro cell 20 </ b> B and the nano cell 40 </ b> B are formed concentrically. A base station 65 having a dual connectivity function shared by the macrocell base station 20 and the 5G base station 40 is provided. In FIG. 16, the same reference numerals are given to portions common to FIG. 6 described above, and description thereof is omitted.

  In FIG. 16, the bearer splitter 127 determines that automatic driving communication and in-car entertainment communication such as movie and music distribution are performed from the user context information and session information, and the communication area is wide for automatic driving communication. Multi-band communication is used to distribute packets of each application so that the 900 MHz frequency band (band 1) with few handovers is used, and the 5 GHz frequency band with high communication speed and high communication capacity is used for in-car entertainment communication.

  Note that the components of the wireless communication system, base station, and mobile station described in this specification can be implemented by various means. For example, these steps and components may be implemented in hardware, firmware, software, or a combination thereof.

  For hardware implementation, one or more means such as processing units used to realize the above steps and components in an entity (eg, base station, mobile station, hard disk drive device, or optical disk drive device) Application Specific IC (ASIC), Digital Signal Processor (DSP), Digital Signal Processor (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), Processor, Controller, Micro It may be implemented in a controller, microprocessor, electronic device, other electronic unit designed to perform the functions described herein, a computer, or a combination thereof.

  Also, for firmware and / or software implementation, means such as processing units used to implement the above components may be programs (eg, procedures, functions, modules, instructions) that perform the functions described herein. , Etc.). In general, any computer / processor readable medium that specifically embodies firmware and / or software code is means such as a processing unit used to implement the steps and components described herein. May be used to implement For example, the firmware and / or software code may be stored in a memory, for example, in a control device, and executed by a computer or processor. The memory may be implemented inside the computer or processor, or may be implemented outside the processor. The firmware and / or software code may be, for example, random access memory (RAM), read only memory (ROM), nonvolatile random access memory (NVRAM), programmable read only memory (PROM), electrically erasable PROM (EEPROM) ), FLASH memory, floppy disk, compact disk (CD), digital versatile disk (DVD), magnetic or optical data storage, etc. Good. The code may be executed by one or more computers or processors, and may cause the computers or processors to perform the functional aspects described herein.

  Also, descriptions of embodiments disclosed herein are provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. The present disclosure is therefore not limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

DESCRIPTION OF SYMBOLS 10 Mobile station 20 Macrocell base station 30 Microcell base station 40 5th generation base station 60 Base station (macrocell base station + microcell base station)
65 base station (macrocell base station + 5th generation base station)
111, 121 PDCP layer 112, 122 RLC layer 113, 123 MAC layer 114, 124 PHY layer 115 Sensor 116 Application information acquisition unit 117, 125 Packet analysis unit 118, 127 Bearer splitter 126 Scheduler

International Publication No. 2015/108068

Claims (19)

A wireless communication system for performing packet communication consisting of a plurality of packets using a plurality of frequency bands simultaneously between a base station and a mobile station,
Means for obtaining user context information relating to user usage status of the mobile station and session information of packet communication of the plurality of frequency bands by the mobile station;
Based on the user context information and the session information, the plurality of packets transmitted / received between the base station and the mobile station are transmitted / received in the same frequency band. A wireless communication system comprising: means for collectively allocating each session to a plurality of frequency bands.   The wireless communication system of claim 1.
  Based on the user context information and the session information, the same application that transmits and receives the plurality of packets transmitted and received between the base station and a plurality of applications that are simultaneously activated by the mobile station in the same session A wireless communication system, wherein the plurality of packets are collectively distributed to each of the sessions so as to be transmitted and received in the same frequency band corresponding to the application. The wireless communication system according to claim 1 or 2 ,
The user context information includes presence information of a user using the mobile station, position information of the mobile station, movement speed information of the mobile station, and application information related to an activation state of an application using packet communication by the mobile station. , Usage environment information of the mobile station, behavior information before use of the mobile station or scheduled behavior information after use, date and time information or time zone information using the mobile station, user using the mobile station A wireless communication system comprising: at least one piece of health information, information on a psychological state of a user using the mobile station, and weather information when using the mobile station. The wireless communication system according to any one of claims 1 to 3 ,
Based on the user context information, in the case of a communication packet with a large communication volume, the packet is allocated to a frequency band with a high communication speed or a large communication capacity among the plurality of frequency bands, and In this case, the packet is distributed so as to distribute the packet to a frequency band having a low communication speed or a small communication capacity among the plurality of frequency bands. The wireless communication system according to any one of claims 1 to 4 ,
The user context information and the session information, and fairness between frequency bands in the plurality of frequency bands, fairness between mobile stations in the plurality of mobile stations connected to the base station, frequencies in the plurality of frequency bands Allocating packets transmitted and received between the base station and the mobile station to the plurality of frequency bands on the basis of load distribution between bands and at least one information of a radio channel condition of each frequency band, Wireless communication system. In the radio | wireless communications system in any one of Claims 1 thru | or 5 ,
The mobile station
User context information acquisition means for acquiring the user context information;
Information transmitting means for transmitting the user context information to the base station,
The base station
Information receiving means for receiving the user context information from the mobile station;
Based on the user context information received from the mobile station, packet distribution means for distributing the plurality of downlink packets transmitted from the base station to the mobile station to the plurality of frequency bands for each packet;
A wireless communication system comprising: packet transmission means for transmitting the plurality of packets distributed to the plurality of frequency bands. The wireless communication system according to any one of claims 1 to 6 ,
The base station
Session information acquisition means for acquiring session information of a plurality of downlink packets transmitted from the base station to the mobile station;
Packet distribution means for distributing the plurality of downlink packets to the plurality of frequency bands for each packet based on the session information;
A wireless communication system comprising: packet transmission means for transmitting the plurality of packets distributed to the plurality of frequency bands. The wireless communication system according to any one of claims 1 to 7 ,
The mobile station
User context information acquisition means for acquiring the user context information;
Information transmitting means for transmitting the user context information to the base station,
The base station
Information receiving means for receiving the user context information from the mobile station;
Based on the user context information received from the mobile station, packet distribution means for distributing a plurality of uplink packets transmitted from the mobile station to the base station for each of the packets to the plurality of frequency bands;
Schedule instruction information transmitting means for transmitting schedule instruction information including distribution information of the uplink packet to the mobile station, and
The mobile station
Schedule instruction information receiving means for receiving the schedule instruction information from the base station;
A wireless communication system comprising: packet transmission means for transmitting the plurality of packets distributed to the plurality of frequency bands based on the schedule instruction information. The wireless communication system according to any one of claims 1 to 8 ,
The mobile station
Session information acquisition means for acquiring session information of a plurality of uplink packets transmitted from the mobile station to the base station;
Information transmitting means for transmitting the session information to the base station,
The base station
Information receiving means for receiving the session information from the mobile station;
Based on the session information received from the mobile station, packet distribution means for distributing the plurality of uplink packets to the plurality of frequency bands for each packet;
Schedule instruction information transmitting means for transmitting schedule instruction information including distribution information of the uplink packet to the mobile station, and
The mobile station
Schedule instruction information receiving means for receiving the schedule instruction information from the base station;
A wireless communication system comprising: packet transmission means for transmitting the plurality of packets distributed to the plurality of frequency bands based on the schedule instruction information. The wireless communication system according to any one of claims 1 to 7 ,
The mobile station
User context information acquisition means for acquiring the user context information;
Packet distribution means for distributing a plurality of uplink packets transmitted from the mobile station to the base station to the plurality of frequency bands for each packet based on the user context information;
A wireless communication system comprising: packet transmission means for transmitting the plurality of packets distributed to the plurality of frequency bands. In the radio | wireless communications system in any one of Claim 1 thru | or 7 and Claim 10 ,
The mobile station
Session information acquisition means for acquiring session information of a plurality of uplink packets transmitted from the mobile station to the base station;
Packet distribution means for distributing the plurality of uplink packets to the plurality of frequency bands for each packet based on the session information;
A wireless communication system comprising: packet transmission means for transmitting the plurality of packets distributed to the plurality of frequency bands. The wireless communication system according to any one of claims 6 to 11 ,
The packet distribution means is provided in the scheduler of the media access control layer (MAC layer) of the base station or the bearer splitter of the packet convergence protocol layer (PDCP layer) of the base station or the mobile station. A wireless communication system. The wireless communication system according to any one of claims 1 to 12 ,
The base station includes a plurality of sets of antennas and radio signal amplifiers provided corresponding to the plurality of frequency bands, and a centralized base station connected to each of the plurality of radio signal amplifiers by transmission cables. A wireless communication system. The wireless communication system according to any one of claims 1 to 13 ,
The wireless communication system, wherein the base station forms a macro cell and a small cell using different frequency bands. A base station that performs packet communication consisting of a plurality of packets using a plurality of frequency bands simultaneously with a mobile station,
Information acquisition means for acquiring user context information relating to user usage status of the mobile station and session information of packet communication of the plurality of frequency bands by the mobile station;
Based on the user context information and the session information, a plurality of downlink packets transmitted to the mobile station are transmitted for each session such that a plurality of packets transmitted and received in the same session are transmitted and received in the same frequency band. Packet distribution means for allocating to the plurality of frequency bands together ,
Packet transmission means for transmitting the plurality of packets distributed to the plurality of frequency bands to the mobile station.   The base station of claim 15,
  Based on the user context information and the session information, the same application that transmits and receives the plurality of packets transmitted and received between the base station and a plurality of applications that are simultaneously activated by the mobile station in the same session A base station characterized in that a plurality of packets are grouped for each session so as to be transmitted and received in the same frequency band corresponding to the application. A mobile station that performs packet communication consisting of a plurality of packets using a plurality of frequency bands simultaneously with a base station,
Information acquisition means for acquiring user context information relating to user usage status of the mobile station and session information of packet communication of the plurality of frequency bands by the mobile station;
Information transmitting means for transmitting the user context information and the session information to the base station;
Based on the user context information and the session information, the plurality of packets received by the base station from the mobile station are grouped for each session such that a plurality of packets in the same session are transmitted and received in the same frequency band. Schedule instruction information receiving means for receiving schedule instruction information including distribution information of a plurality of uplink packets distributed to a plurality of frequency bands from the base station;
A mobile station comprising: packet transmission means for transmitting the plurality of packets distributed to the plurality of frequency bands to the mobile station based on the schedule instruction information. A mobile station that performs packet communication consisting of a plurality of packets using a plurality of frequency bands simultaneously with a base station,
Information acquisition means for acquiring user context information relating to user usage status of the mobile station and session information of packet communication of the plurality of frequency bands by the mobile station;
Based on the user context information and the session information, a plurality of uplink packets transmitted to the base station, and a plurality of packets transmitted and received in the same session are transmitted and received in the same frequency band. Packet allocating means for allocating to each of the plurality of frequency bands together ,
Packet transmitting means for transmitting the plurality of packets distributed to the plurality of frequency bands to the mobile station.   The mobile station according to claim 17 or 18,
  Based on the user context information and the session information, the same application that transmits and receives the plurality of packets transmitted and received between the base station and a plurality of applications that are simultaneously activated by the mobile station in the same session A mobile station characterized in that each of the sessions is collectively distributed to a plurality of frequency bands so that the plurality of packets are transmitted and received in the same frequency band corresponding to the application.