JP6956123B2 - Base station system and wireless communication equipment - Google Patents

Description

The present invention relates to a base station system and a wireless communication device to which network slicing is applied.

In the 5th generation (5G) mobile communication system, the service types are large capacity (eMBB: enhanced Mobile BroadBand), ultra-reliable and low latency (URLLC: Ultra-Reliable and Low Latency Communications), and multi-connection (mMTC: massive Machine Type Communications). It is roughly divided into three types, and each service request is different. Network slicing is being considered in order to provide services with different requirements economically and flexibly.

Further, an LTE (Long Term Evolution) base station is usually composed of an RRH (Remote Radio Head) and a BBU (Baseband Unit), and the base station functions are separately arranged in the RRH and the BBU, respectively. .. Specifically, among the functions of the base station (RF, PHY, MAC, RLC, PDCP in order from the lower layer), RF is arranged in RRH, and functions other than RF are arranged in BBU. In recent years, 3GPP has been discussing the redefinition of base station functions arranged in RRH and BBU (redefinition of functional decomposition). In general, it is known that the performance of inter-base station cooperation (inter-cell cooperation), the amount of delay given to an application, the network utilization efficiency, etc. differ depending on the function division option and the location of the BBU. There is. In 5G, the first edition of which is defined as 3GPP Release 15, a node in which lower layer functions are arranged is called a DU (Distributed Unit), and a node in which other upper layer functions are arranged is called a CU (Central Unit).

Non-Patent Documents 1 and 2 propose a RAN slicing architecture in which an appropriate functional decomposition option and a virtual network (slice) in which a BBU is arranged can be selected according to a service. According to this RAN slicing architecture, for each service, a CU (BBU) to which an appropriate function division option is applied is launched as a virtual machine on a server placed in an appropriate location, and each CU is supported by a corresponding DU (BBU). It can be connected to RRH). Further, in Patent Document 1, a radio resource hypervisor is provided in a base station provided with a plurality of schedulers corresponding to a plurality of slices in order to realize isolation between slices in a RAN to which network slicing is applied. The configuration is disclosed.

U.S. Pat. No. 9,680,958

KDDI R & D Laboratories, Inc., "Development of slicing technology for" 5G "x virtualized base stations", [online], May 21, 2018, [Search on February 12, 2019], Internet <URL : https://www.kddi-research.jp/newsrelease/2018/052101.html ＞ Tsukamoto, Namba, Nishimura, "RAN Slicing Architecture with Base Station Functional Decomposition and Arrangement for Various 5G Services", Shingaku Giho, Vol. 118, No. 208, CS2018-53, pp.69-74 , September 2018.

In a base station system in which network slicing is applied and the base station function is divided into a plurality of units as in the above-mentioned prior art, a plurality of schedulers corresponding to a plurality of slices are arranged in different locations. sell. For example, the scheduler for slice 1 may be located at the antenna site, while the scheduler for slice 2 may be located at a local accommodation station (local office) away from the antenna site. In such a case, it is necessary to appropriately control the timing of allocating radio resources in consideration of the delay in the arrival time of the scheduling information transmitted from each scheduler.

The present invention has been made in view of the above-mentioned problems. An object of the present invention is to provide a technique for controlling the timing of allocating radio resources to each slice based on scheduling information from a plurality of schedulers arranged at different locations in a base station system to which network slicing is applied. It is said.

The base station system according to one aspect of the present invention has at least a scheduling function for allocating radio resources to wireless terminals among the functions of the base station, and each corresponds to one or more slices. The plurality of first units, which are arranged at the antenna site or are arranged between the antenna site and the core network, and each of the plurality of first units. A plurality of second units arranged between the different first unit and the core network, and having a function of a higher layer than the function of the one first unit among the functions of the base station. And, it has at least a radio wave transmission / reception function, and corresponds to one wireless unit arranged at the antenna site and a plurality of schedulers included in different first units according to the distribution rate notified from the RAN controller. A resource control unit arranged at the antenna site, which allocates a resource block of radio resources used in the slice to be used, is provided, and the resource control unit receives scheduling information indicating the scheduling from each scheduler, and then the resource control unit. The scheduling information is transferred to the wireless unit at a transfer timing that arrives at predetermined time intervals.

The wireless communication device according to one aspect of the present invention has at least a scheduling function for allocating wireless resources to wireless terminals among the functions of the base station, and each corresponds to one or more slices. A plurality of first units and each of the plurality of first units are arranged between a different first unit among the plurality of first units and the core network, and among the functions of the base station, the one first unit is used. A wireless communication device arranged at an antenna site in a base station system including a plurality of second units having a function of a layer higher than the function having the function and at least one wireless unit having a function of transmitting and receiving radio waves. Corresponds to one or more first units of the plurality of first units, the wireless unit, and a plurality of schedulers included in different first units according to the allocation rate notified from the RAN controller. A resource control unit that allocates a resource block of radio resources used in slicing is provided, and the resource control unit receives scheduling information indicating the scheduling from each scheduler, and then receives the scheduling information at predetermined time intervals. It is characterized in that it transfers to the wireless unit at the transfer timing that arrives at.

According to the present invention, in a base station system to which network slicing is applied, it is possible to control the timing of allocating radio resources to each slice based on scheduling information from a plurality of schedulers arranged at different locations. ..

The figure which shows the example of the function division option of a base station. The figure which shows the functional configuration example of CU, DU and RU in a base station system. The figure which shows the basic configuration example of a base station system. The figure which shows the configuration example of a base station system. The figure which shows the example of the allocation of radio resources to each slice. Sequence diagram of uplink communication. Sequence diagram of downlink communication. The figure which shows the example of the allocation of radio resources to each slice. The figure which shows the example of the allocation of radio resources to each slice. The figure which shows the hardware configuration example of a wireless communication device.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In each of the following figures, components that are not necessary for the description of the embodiment will be omitted from the drawings.

<Function division of base station>
A base station (base station system) generally has a plurality of functions from a function of a lower layer to a function of an upper layer, and these functions are divided into DU and CU and arranged. As mentioned above, DU corresponds to RRH in LTE and CU corresponds to BBU in LTE. FIG. 1 is a diagram showing options for dividing the base station function specified in 3GPP, and the functions (RF, ..., PDCP) of each layer of the base station are divided into DU and CU and arranged. The dividing points are shown as options 1-8. By dividing the functions of the base station into DU and CU and arranging them, some functions of the upper layer of the base station are arranged in CU, and the remaining functions are arranged in DU.

FIG. 2 is a diagram showing an example of a configuration in which a plurality of functions of different layers of the base station shown in FIG. 1 are divided into CU, DU, and RU. As shown in FIG. 2, in the present embodiment, in addition to the CU and DU, a radio unit (RU: Radio Unit) having functions such as RF and PHY is newly provided. The base station (base station system) of FIG. 2 is composed of CU10, DU20, and RU30, the CU10 is connected to a core network (5GC, EPC, etc.), and the DU20 is connected between the CU10 and the RU30. ..

The DU 20 is an example of a first unit having at least a scheduling function for allocating radio resources to wireless terminals among the functions of a base station. The CU 10 is an example of a second unit having a function of a higher layer than the function of the connected DU20 (first unit) among the functions of the base station. Further, the RU 30 is an example of a wireless unit having at least a radio frequency transmission / reception function (RF) among the functions of a base station.

In the configuration example of FIG. 2, the DU 20 has not only the High MAC function corresponding to the scheduling function but also the RLC and Low MAC functions, and the CU 10 is a function of a higher layer than the function of the DU 20. It has the functions of SDAP / RRC and PDCP. Further, the RU 30 has not only an RF function corresponding to a radio wave transmission / reception function but also a PHY function. In addition, only a part of the functions of the PHY may be mounted on the RU 30, and the remaining functions of the PHY may be mounted on the DU 20.

Hereinafter, the configuration and operation of the base station system according to the present embodiment will be specifically described using the functional configuration shown in FIG. 2 as an example.

<Base station system configuration>
FIG. 3 is a diagram showing a basic configuration example of a base station system in which slices 1 to 3 corresponding to mMTC, URLLC, and eMBB are generated as service types. The CU 10 and DU 20 are controlled and managed by the NFV / SDN-based RAN controller 40, and each slice is generated by the RAN controller 40.

The base station system is composed of a plurality of CU10s (10a, 10b, 10c), a plurality of DU20s (20a, 20b, 20c), and one RU30. CU10a and DU20a correspond to slice 1, CU10b and DU20b correspond to slice 2, and CU10c and DU20c correspond to slice 3. As described above, the plurality of CUs 10 correspond to different slices, and the same applies to the plurality of DUs 20 corresponding to the plurality of CUs 10. The plurality of CUs 10 may each correspond to one or more slices, and some of the corresponding slices may be common among the different CUs 10. Further, each of the plurality of DU 20s may correspond to one or more slices, and some of the corresponding slices may be common among different DU 20s.

The DU 20 has at least a radio resource scheduling function (for example, a High MAC function) among the functions of the base station. Each DU 20 is located at the antenna site or between the antenna site and the core network (local containment station).

Each of the CUs 10 is arranged between a different DU of the DU 20 and the core network, and among the functions of the base station, a function of a higher layer than the function of the connected DU (for example,). It has the functions of SDAP / RRC and PDCP). In the example of FIG. 3, the CU 10a, 10b, 10c are connected to one different DU 20a, 20b, 20c, respectively.

The single RU30 has at least a radio wave transmission / reception function (for example, an RF function) among the functions of the base station. The RU 30 is located at the antenna site and is connected to a plurality of DU 20s. Thereby, a plurality of slices 1 to 3 provided via the plurality of DUs 20 are provided in the same cell formed by the RU.

As described above, the base station system of the present embodiment is composed of the CU 10 and DU 20 corresponding to each of the slices 1 to 3 and a single RU 30 connected to the plurality of DU 20s and arranged at the antenna site. ing. That is, the base station system has a configuration in which a plurality of DUs and CUs are connected to a single RU (that is, the RUs are shared by the plurality of DUs and CUs) without providing a RU for each slice. Have. As a result, a single RU can accommodate a plurality of services (slices).

In the present embodiment, the RAN controller 40 that controls the function of the RAN is provided in the core network or the RAN (radio access network). The RAN controller 40 sets (generates) slices 1 to 3 corresponding to the service requirements for the plurality of CUs 10 (10a, 10b, 10c) and the plurality of DUs 20 (20a, 20b, 20c) on the RAN.

In this embodiment, a 5G network configuration is assumed as an example. In FIG. 3, the 5GC CPF (5G Core Control Plane Function) 60 is a control processing function group of the 5G core network. The 5GC UPF (5G Core User Plane Function) 50 (50a, 50b, 50c) is a data processing function group of the 5G core network, and is provided for each slice. 5GC UPF50a corresponds to slice 1, 5GC UPF50b corresponds to slice 2, and 5GC UPF50c corresponds to slice 3.

In the configuration example of FIG. 3, the arrangement of the corresponding CU 10 and DU 20 is different depending on the slice (service). Depending on the arrangement of the CU 10 and the DU 20, the performance of inter-base station cooperation (inter-cell cooperation), the amount of delay given to the application, the network utilization efficiency, and the like differ. Therefore, in the configuration of FIG. 3, CU10 and DU20 are arranged appropriately for each slice (service).

For slice 1 (mMTTC slice), the CU10a is located in the data center between the local containment station and the core network, and the DU20a is located at the antenna site. This is because the statistical multiplex effect makes the computing resources of the data center available efficiently.

For slice 2 (URLLC slice), the CU 10b is located at the local accommodation station and the DU 20b is located at the antenna site. This makes it possible to introduce MEC (Multi-Access Edge Computing) and realizes low latency. In the present embodiment, the CU 10b is connected to an Edge App (Edge Application Server) 70, which is an edge server having an application for providing a low-latency service, which is arranged at an edge site. The edge site where the Edge App70 is located may be the local accommodation station where the CU10b is located.

For slice 3 (eMBB slice), both CU10c and DU20b are located at the local detention bureau. This makes it possible to connect the DU 20b to a plurality of RU 30s arranged at different antenna sites. In the present embodiment, the DU 20b is connected to a plurality of RUs 30 forming different cells, and a process for inter-cell coordination (for example, CoMP (Coordinated Multi-Point Transmission / reception)) between the connected RUs. I do. By enabling cell-cell coordination in this way, it is possible to improve the wireless communication quality.

FIG. 4 is a diagram showing a more specific configuration example of the base station system according to the present embodiment. The DUs 20a, 20b, and 20c include schedulers 21a, 21b, and 21c, respectively, that perform scheduling for allocating radio resources to wireless terminals. As shown in FIG. 4, the schedulers 21a and 21b corresponding to the slices 1 and 2 are arranged at the antenna site, and the scheduler 21c corresponding to the slice 3 is accommodated in the local accommodation station. As described above, the arrangement locations of the schedulers 21a and 21b and the scheduler 21c are different.

Here, in the scheduling of radio resources when network slicing is applied, not only the isolation that prevents the slices from affecting each other, but also the schedulers are placed in different places as described above. Scheduling needs to be realized. In the present embodiment, in a base station system to which network slicing is applied as shown in FIGS. 3 and 4, radio resource allocation to each slice based on scheduling information from a plurality of schedulers arranged at different locations is used. An example of controlling the timing will be described.

In the present embodiment, the antenna site is provided with a wireless communication device 100 including a RU 30 and one or more DUs among a plurality of DU 20s. The wireless communication device 100 can be realized, for example, by the configuration shown in FIG. 10 described later. The wireless communication device 100 includes a single communication port that is communicably connected to the CU 10 and DU 20 outside the device. In the line (front hole link) between the communication port and the external CU10 and DU20, the intermediate data of the CU10 and DU20 is transmitted by being encapsulated in an Ethernet (registered trademark) frame.

In addition to the DUs 20a, 20b and RU30, the wireless communication device 100 includes a wireless resource hypervisor (WRH) 120 arranged between the lower layer RU30 and the upper layer DU20. The WRH120 (resource control unit) refers to the radio resources used in the corresponding slices according to the distribution ratio notified from the RAN controller 40 to the plurality of schedulers 21 (21a, 21b, 21c) corresponding to the slices 1 to 3. Has a function of allocating a resource block (RB) of. Further, as will be described later, the WRH 120 also has a function of transmitting the scheduling information received from each scheduler 21 to the lower layer function (RU30) at an appropriate timing.

<Allocation of radio resources to each slice>
Next, an example of allocating radio resources to each slice (each scheduler 21) by the WRH 120 will be described with reference to FIG. The allocation rate of the radio resource to each slice is set for each slice by the RAN controller 40, and the RAN controller 40 notifies the WRH 120. In the example of FIG. 5, 10%, 20%, and 70% are set as the distribution ratios for slices 1 to 3, respectively.

The WRH 120 randomly allocates RBs within the period corresponding to the update interval i to each slice according to the notified allocation rate for each update interval i (S1). The WRH120 may allocate RB to each slice according to some specific algorithm. The update interval i can be predetermined according to the number of slices set for the plurality of CUs 10 and the plurality of DUs 20.

Next, each scheduler 21 schedules the wireless terminal accessing the corresponding slice using the RB assigned from the WRH 120 (S2). That is, each scheduler 21 allocates the RB assigned from the WRH 120 to the wireless terminal that accesses the corresponding slice.

The WRH 120 then randomly allocates RBs within the period corresponding to the next update interval i to each slice according to the notified allocation rate (S3). Further, each scheduler 21 schedules the wireless terminal accessing the corresponding slice using the RB assigned from the WRH 120 (S4). By repeating such processing, isolation in scheduling of radio resources in the base station system to which network slicing is applied is realized.

In this way, by using WRH120, isolation in scheduling of radio resources can be realized. On the other hand, due to the different arrangement locations of the scheduler 21 corresponding to each slice, there may be a time lag in the arrival of the scheduling information indicating scheduling from each scheduler 21 to the RU 30. In the present embodiment, in order to deal with such a difference in arrival time of scheduling information, WRH120 receives scheduling information from each scheduler 21 and then sends the scheduling information to RU30 at a transfer timing in which the scheduling information arrives at predetermined time intervals. Transfer to.

<Communication sequence>
6 and 7 are sequence diagrams showing an example of a sequence of uplink communication and downlink communication in the base station system according to the present embodiment. The WRH120 executes the same transfer control as the transfer control of scheduling information in the uplink communication and the downlink communication.

First, the RAN controller 40 sets the RB allocation rate for each slice based on the slice design policy, and notifies the WRH120 of the set allocation rate (S601, S701). The WRH 120 allocates RBs within the period corresponding to the update interval i to each scheduler 21 according to the notified allocation rate, and notifies each scheduler 21 of information indicating the allocation result (S602, S702).

After that, it is assumed that an uplink or downlink scheduling request is simultaneously transmitted to each scheduler 21 from the wireless terminal 200 or the core network in the cell formed by the RU 30. In this case, each scheduler 21 performs scheduling using the RB assigned from the WRH 120 based on a predetermined scheduling algorithm (Round Robin, Proportional Fairness, Max C / I, etc.). Each scheduler 21 notifies the WRH 120 of scheduling information indicating the result of scheduling (S603, S703).

At this time, the arrival time of the scheduling information from the scheduler 21c arranged in the local accommodation station is delayed with respect to the arrival time of the scheduling information from the schedulers 21a and 21b in the wireless communication device 100. In this example, the scheduling information from the scheduler 21c does not arrive in time for the UL grant or DL grant transmission timing at a certain transmission time interval (TTI) after the scheduling information arrives from the schedulers 21a and 21b. Therefore, the WRH 120 collectively transfers the scheduling information from the scheduler 21c to the RU30 together with the scheduling information subsequently received from the schedulers 21a and 21b in the next TTI. That is, if the scheduling information of the slice 3 from the scheduler 21c is not in time for the same TTI as the transmission of the UL grant or DL grant for the other slice, the WRH120 will perform the UL grant or the UL grant for the slice 3 in the next TTI. Control the transfer of scheduling information so that the DL grant is transmitted. As a result, in the next TTI, the RU 30 transmits the UL grant or DL grant of the slices 1 to 3 to the wireless terminal 200 according to the scheduling information from the schedulers 21a, 21b, 21c.

In this way, after receiving the scheduling information from each scheduler 21, the WRH 120 transfers the scheduling information to the RU 30 at the transfer timing that arrives at predetermined time intervals (TTI). That is, after receiving the scheduling information from each scheduler 21, the WRH 120 buffers the scheduling information until the next transfer timing that arrives at a predetermined time interval (TTI).

Further, for example, when cell-cell coordination such as CoMP is performed in slice 3, the scheduler 21c may transmit reservation information for reserving the RB used in the corresponding slice 3 to WRH120 together with the scheduling information. There are (S604, S704). In this case, when the WRH 120 receives the reservation information from any of the plurality of schedulers 21, the WRH 120 allocates the RB to the plurality of schedulers according to the reservation information. Specifically, the WRH 120 allocates the RB indicated by the reservation information to the scheduler 21c of the transmission source of the reservation information among the RBs to be allocated, and a plurality of the remaining RBs according to the allocation rate notified from the RAN controller 40. Assigned to the schedulers 21a, 21b, 21c of. The WRH 120 notifies each scheduler 21 of information indicating the allocation result (S605, S705).

In this way, the WRH 120 allocates RBs to the plurality of schedulers 21 at the timing of each update interval i determined according to the number of slices, and also at the timing when the RB reservation occurs, the plurality of schedulers 21. RB is assigned to. It should be noted that the above-mentioned RB reservation is not only for the reservation of the RB used for CoMP, but also for the reservation of the RB assigned to the wireless terminal (for example, IoT device) using the limited RB, for example. May also be done. This makes it possible to simplify the receiver of the IoT device and contribute to the power saving of the IoT device.

<Allocation of wireless resources based on reservation information>
Next, with reference to FIGS. 8 and 9, an example of allocation of radio resources to each slice (each scheduler 21) based on reservation information by WRH120 will be described. In the examples of FIGS. 8 and 9, 10%, 20%, and 70% are set as the allocation ratios for the slices 1 to 3 of the cell 1, respectively, and the allocation ratios for the slices 1 to 3 of the cell 2 are 15%. , 25% and 60%, respectively.

As in the example of FIG. 5, each WRH120 of cell 1 and cell 2 randomly determines the RB within the period corresponding to the update interval i for each update interval i for each slice according to the notified allocation rate. Allocate (S11). After that, in each cell, each scheduler 21 schedules the wireless terminal accessing the corresponding slice using the RB assigned from the WRH 120 (S12).

After that, the WRH120 of each cell randomly allocates RBs within the period corresponding to the next update interval i to each slice according to the notified allocation rate (S13). However, in this example, in each of the cells 1 and 2, some RBs are reserved for the slice 3 from the scheduler 21c to the WRH120. Therefore, the WRH120 of each cell allocates the RB indicated by the reservation information among the RBs to be allocated to the scheduler 21c of the transmission source of the reservation information, and allocates the remaining RBs according to the allocation rate notified from the RAN controller 40. It is assigned to a plurality of schedulers 21a, 21b, 21c.

Next, in each cell, each scheduler 21 schedules the wireless terminal accessing the corresponding slice using the RB assigned from the WRH 120, as in S12 (S14). By repeating such processing, isolation in scheduling of radio resources in the base station system to which network slicing is applied is realized, and radio resources are allocated to each slice based on the reservation information. .. This makes it possible to reserve the RB used for CoMP, as described above. Alternatively, it is possible to reserve an RB to be assigned to a wireless terminal (for example, an IoT device) that uses a limited RB.

<Configuration of CU, DU, RU and wireless communication device>
The CU 10 and DU 20 have, for example, a hardware configuration as shown in FIG. Specifically, the CU 10 (DU 20) has an external storage device 104 such as a CPU 101, a ROM 102, a RAM 103, and an HDD, and a communication device 105.

In the CU 10 (DU 20), for example, a program stored in any of the ROM 102, the RAM 103, and the external storage device 104 that realizes each of the above-mentioned functions of the CU 10 (DU 20) is executed by the CPU 101. The CPU 101 may be replaced by one or more processors such as an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), and a DSP (digital signal processor).

The communication device 105 is a communication interface for communicating with an external device such as a node (5GC CPF60 and 5GC UPF50), a RAN controller 40, and a connected DU20 (CU10) in the core network under the control of the CPU 101. Is. The CU 10 (DU 20) may have a plurality of communication devices 105 having different connection destinations.

The CU 10 (DU 20) may be provided with dedicated hardware for executing each of the above-mentioned functions, or a part of the CU 10 (DU 20) may be executed by the hardware and the other parts may be executed by the computer running the program. .. Also, all functions may be performed by a computer and a program.

The RU 30 may also have a hardware configuration as shown in FIG. As the communication device 105, the RU 30 includes a wireless communication interface for wireless communication with a wireless terminal in addition to a communication interface for communication with each DU 20.

Further, as shown in FIG. 4, when the DU 20a, 20b, WRH120 and RU30 are configured as the wireless communication device 100, the wireless communication device 100 can be realized by the hardware configuration shown in FIG.

As described above, the base station system of the present embodiment is composed of a plurality of CUs 10, a plurality of DUs 20, a single RU30, and a WRH120 (resource control unit). Among the functions of the base station, the plurality of DUs 20 have at least a scheduling function for allocating radio resources to wireless terminals, and each of the plurality of DUs 20 corresponds to one or more slices. The plurality of DU 20s are arranged at the antenna site or between the antenna site and the core network. Each of the plurality of CUs 10 is arranged between a different DU of the plurality of DUs 20 and the core network, and has a function of a higher layer than the function of the one DU among the functions of the base station. .. The RU 30 has at least a radio wave transmission / reception function among the functions of the base station, and is arranged at the antenna site. The WRH 120 is arranged at the antenna site and allocates RBs of radio resources used in the corresponding slices to a plurality of schedulers 21 included in different DUs 20 according to the allocation rate notified from the RAN controller 40. After receiving the scheduling information from each scheduler 21, the WRH 120 transfers the scheduling information to the RU 30 at the transfer timing that arrives at predetermined time intervals.

According to this embodiment, in a base station system to which network slicing is applied, isolation between slices in scheduling radio resources can be realized. Further, even if the arrangement location of the scheduler 21 is different for each slice, it is possible to allocate the wireless resource to the wireless terminal at an appropriate timing.

In addition, it is possible to reserve a common wireless resource (RB) between cells for each slice, and by allocating RBs to a plurality of schedulers 21 according to the reservation information, wireless communication quality can be improved by inter-cell cooperation such as CoMP. It will be possible to improve. Alternatively, by using the RB reservation to use the limited RB for a wireless terminal such as an IoT device, it is possible to simplify the receiver of the IoT device and save the power of the IoT device. Will be possible.

[Other Embodiments]
The wireless communication device according to the above-described embodiment can be realized by a computer program for making the computer function as a wireless communication device. The computer program is stored in a computer-readable storage medium and can be distributed, or can be distributed via a network.

10: CU, 20: DU, 30: RU, 40: RAN controller, 50: 5GC UPF, 60: 5GC CPF, 70: Edge application, 100: Wireless communication device, 101: CPU, 102: ROM, 103: RAM, 104: External storage device, 105: Communication device, 120: WRH, 21: Scheduler

Claims (14)

It ’s a base station system,
Among the functions of the base station, there are a plurality of first units each having at least a scheduling function for allocating wireless resources to wireless terminals and each corresponding to one or more slices, and are used at the antenna site. With the plurality of first units arranged or arranged between the antenna site and the core network.
Each is arranged between a different first unit of the plurality of first units and the core network, and among the functions of the base station, a layer higher than the function of the one first unit. With multiple second units having the function of
One wireless unit that has at least a radio wave transmission / reception function and is located at the antenna site,
A resource control unit located at the antenna site that allocates resource blocks of radio resources used in the corresponding slices to a plurality of schedulers included in different first units according to the allocation rate notified from the RAN controller. And with
The resource control unit receives scheduling information indicating the scheduling from each scheduler, and then transfers the scheduling information to the wireless unit at a transfer timing that arrives at predetermined time intervals. system. Each of the plurality of schedulers performs the scheduling using the resource block assigned by the resource control unit in response to the uplink or downlink scheduling request, and transmits the scheduling information to the resource control unit. The base station system according to claim 1. The first or second aspect of the present invention, wherein the resource control unit buffers the scheduling information after receiving the scheduling information from each scheduler until the next transfer timing that arrives at the predetermined time interval. Base station system. The predetermined time interval is equal to the update interval of the resource block allocation to the plurality of schedulers by the resource control unit.
The update interval according to any one of claims 1 to 3, wherein the update interval is predetermined according to the number of slices set for the plurality of first units and the plurality of second units. Base station system. The base station system according to claim 4, wherein the resource control unit allocates a resource block to the plurality of schedulers within a period corresponding to the update interval for each update interval. The base station system according to any one of claims 1 to 5, wherein the allocation rate is set for each slice by the RAN controller and notified from the RAN controller to the resource control unit. .. Each of the plurality of schedulers can transmit reservation information for reserving a resource block to be used in the corresponding slice to the resource control unit.
Any of claims 1 to 6, wherein when the resource control unit receives the reservation information from any of the plurality of schedulers, the resource control unit allocates a resource block to the plurality of schedulers according to the reservation information. The base station system according to item 1. Among the resource blocks to be allocated, the resource control unit allocates the resource block indicated by the reservation information to the scheduler that is the source of the reservation information, and allocates the remaining resource blocks to the plurality of schedulers according to the allocation rate. The base station system according to claim 7. The base station system according to claim 7, wherein each of the plurality of schedulers reserves a resource block used for cell-to-cell cooperation with the resource control unit. The invention according to any one of claims 7 to 9, wherein each of the plurality of schedulers reserves a resource block to be allocated to a wireless terminal that uses the limited resource block to the resource control unit. Base station system. The base station system according to any one of claims 1 to 10, wherein the resource control unit is arranged at the antenna site as a functional unit of a layer lower than the plurality of schedulers. The radio unit is connected to the plurality of first units, and a plurality of slices provided through the plurality of first units are provided in the same cell formed by the radio units. The base station system according to any one of claims 1 to 11. Each of the plurality of first units is a DU (Distributed unit).
Each of the plurality of second units is a CU (Central unit), and is
The base station system according to any one of claims 1 to 12, characterized in that. Among the functions of the base station, a plurality of first units each having at least a scheduling function for allocating radio resources to the wireless terminal and each corresponding to one or more slices, and each of the plurality of first units. A plurality of functions of the base station, which are arranged between a different first unit of the first unit and a core network, and have a function of a higher layer than the function of the one first unit. A wireless communication device arranged at an antenna site in a base station system including a second unit and at least one wireless unit having a radio wave transmission / reception function.
With one or more first units of the plurality of first units
With the wireless unit
A resource control unit that allocates a resource block of radio resources used in the corresponding slices according to the allocation rate notified from the RAN controller to a plurality of schedulers included in different first units is provided.
The resource control unit receives scheduling information indicating the scheduling from each scheduler, and then transfers the scheduling information to the wireless unit at a transfer timing that arrives at predetermined time intervals. Device.

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