KR101394805B1 - Method and apparatus for virtualizing wireless access network - Google Patents

Abstract

A resource allocation apparatus for allocating resources of a wireless network providing a plurality of wireless access schemes to a terminal is disclosed. The resource allocation apparatus provides an optimal wireless access scheme to a terminal from among a plurality of wireless access schemes. The resource allocation apparatus can change the radio access scheme provided to the mobile station after considering the resource allocation state of another radio access scheme after resource allocation.

Description

[0001] METHOD AND APPARATUS FOR VIRTUALIZING WIRELESS ACCESS NETWORK [

The following embodiments are directed to an apparatus and method for virtualizing a wireless access network, and specifically to an apparatus and method for mapping nodes and links in accordance with a virtualization request and optimizing a mapped link.

With the evolution of next generation mobile Internet, 2G, 3G, 4G, and B4G mobile communication wireless access networks will coexist, and existing communication service providers will be merged into integrated service providers and many virtual service providers will be generated. In the future Internet to provide such complex future convergence services, wireless network virtualization, in which wireless access networks are converged and shared by various service providers, is essential.

The challenges of wireless network virtualization can be summarized as interference management, resource management, and heterogeneous network topology management. First, as wireless networks become heterogeneous and resource sharing among them becomes active, existing interference management algorithms will not provide the intended performance. Conventional interference management algorithms have performed strict interference management through a single network operator in a formal cell structure, but such strict management is inherently impossible in a wireless virtual network. In addition, there is a problem of resource management with high complexity that occurs when wireless resources are shared among a plurality of service providers.

According to an exemplary embodiment of the present invention, there is provided a resource allocation apparatus of a wireless network for providing a plurality of wireless access schemes, the apparatus comprising: means for, when the terminal initially accesses the wireless network, And a radio resource allocation unit for determining a service radio resource to be allocated to the mobile station among the radio resources allocated to the determined radio access scheme.

Wherein the service connection scheme is provided using a digital unit and a radio unit located remotely from the digital unit and the digital unit performs baseband processing associated with the service connection scheme, Techniques can be performed.

The service connection scheme may be provided using a plurality of radio units, and among the plurality of radio units, a service radio unit to provide the service connection scheme to the mobile station may be selected.

The radio unit determination unit may re-determine the service radio unit among the plurality of radio units according to the traffic of the service radio unit.

Here, the radio unit determination unit may receive channel state information for the plurality of radio units from the terminal, and may determine, based on the channel state information, a radio unit that is not determined as the service radio unit among the plurality of radio units Service radio unit.

The terminal is connectable to the wireless network using a plurality of candidate connection schemes among the plurality of wireless connection schemes, and the connection scheme determination unit may determine the service connection scheme among the plurality of candidate connection schemes .

In addition, the access method determination unit may receive channel state information for a candidate access scheme that is not determined by the service access scheme among the plurality of candidate access schemes from the terminal, and determine the access method based on the channel state information The candidate access scheme can be re-determined as the service access scheme.

Here, the channel state information may include a signal to interference and noise ratio (SINR).

The radio resource allocation unit may determine the service radio resource according to Equation (1).

[Equation 1]

는 이고,

는 사용자 집합이고,

는 t 시점에서 k번째 사용자의 순간 전송률이고,

는 t 시점에서 k번째 사용자의 평균 수율을 의미한다.

는 하기 수학식 2와 같이 결정된다.
here,

Lt; / RTI &

Is a set of users,

Is the instantaneous transmission rate of the k-th user at time t,

Is the average yield of the kth user at time t.

Is determined according to the following equation (2).

&Quot; (2) "

는 사용자 평균 수율의 업데이트 윈도우 크기를 나타낸다.here,

Represents the update window size of the user average yield.

According to another exemplary embodiment, there is provided a method of allocating resources of a wireless network for providing a plurality of wireless access schemes, the method comprising: providing, when the terminal first accesses the wireless network, And determining a service radio resource to be allocated to the mobile station among the radio resources allocated to the determined radio access scheme.

Wherein the service connection scheme is provided using a digital unit and a radio unit located remotely from the digital unit and the digital unit performs baseband processing associated with the service connection scheme, Techniques can be performed.

The service connection scheme may be provided using a plurality of radio units, and may further include selecting a service radio unit to provide the service connection scheme to the mobile station among the plurality of radio units.

The method may further include redetermining the service radio unit among the plurality of radio units according to the traffic of the service radio unit.

Here, the step of re-determining the service radio unit may include receiving channel state information for the plurality of radio units from the terminal, determining, from among the plurality of radio units, The radio unit can be redetermined as the service radio unit.

The terminal is connectable to the wireless network by using a plurality of candidate connection schemes among the plurality of wireless connection schemes, and the determining of the service connection scheme may include selecting the service connection scheme among the plurality of candidate connection schemes Can be determined.

The method may further include receiving channel state information for a candidate access scheme not determined by the service access scheme among the plurality of candidate access schemes from the terminal, May be re-determined by the service connection technique.

Here, the channel state information may include a signal to interference and noise ratio (SINR).

And determining the radio resource by the following Equation (3): < EMI ID = 3.0 >

&Quot; (3) "

는 이고,

는 사용자 집합이고,

는 t 시점에서 k번째 사용자의 순간 전송률이고,

는 t 시점에서 k번째 사용자의 평균 수율을 의미한다.

는 하기 수학식 4와 같이 결정된다.
here,

Lt; / RTI &

Is a set of users,

Is the instantaneous transmission rate of the k-th user at time t,

Is the average yield of the kth user at time t.

Is determined according to the following equation (4).

&Quot; (4) "

는 사용자 평균 수율의 업데이트 윈도우 크기를 나타낸다.here,

Represents the update window size of the user average yield.

According to the embodiments described below, the heterogeneous network and the multiple access technology can be integrated to efficiently operate the network.

According to the embodiments described below, the wireless resources of the wireless access network can be effectively used in a virtual manner.

1 is a diagram illustrating an example of a network virtualization structure.
2 is a diagram illustrating a system model of a cellular network according to an exemplary embodiment.
3 is a block diagram illustrating a structure of a resource allocation apparatus of a wireless network according to an exemplary embodiment.
4 is a diagram illustrating a concept of changing a service access scheme in accordance with an exemplary embodiment.
5 is a diagram illustrating a concept of connection path migration according to an exemplary embodiment.
FIG. 6 is a flowchart illustrating a method of allocating a wireless network resource according to an exemplary embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an example of a network virtualization structure.

Network virtualization refers to a technology that can dynamically construct a virtual network of service units on a shareable physical network and link it to physical and virtual networking resources, thereby integrating the diversity of physical networks and services.

Network virtualization is one of the ways to solve the rigidity of the network structure. Network virtualization can virtualize all the resources in the network, including network links and nodes, so that virtual networks can coexist for different applications / users with different requirements on one infrastructure.

1, network virtualization includes a substrate layer 140 that includes physical network links, nodes 141, 142, 143, 144, 145, 146, 147, 151, 152, 153 and 154, A virtual network layer 120 including network links, nodes 121, 122, 123, 124, 131, 132 and 133, and a service layer 110 including service networks 111, 112 and 113 .

Substrate layer 140 includes physical network links, nodes 141, 142, 143, 144, 145, 146, 147, 151, 152, 153 and 154, The physical network links included in the substrate layer 140 and the nodes 141, 142, 143, 144, 145, 146, 147, 151, 152, 153 and 154 are referred to as substrate links and substrate nodes. .

The virtual network layer 120 includes virtual networks. The virtual networks are composed of virtual links or virtual nodes 121, 122, 123, 124, 131, 132 and 133 and virtual links or virtual nodes 121, 122, 123, 124, 131, 132, May be mapped to substrate links of substrate 140, substrate nodes 141, 142, 143, 144, 145, 146, 147, 151, 152, 153, 1, the virtual node 121 is mapped to the substrate node 142, and the other virtual nodes 122, 123, 124, 131, 132, and 133 are also mapped to the respective substrate nodes 142, 143, , 146, 147, 151, 152, 153, 154). In this case, the characteristic substrate node 145 can be mapped to a plurality of virtual nodes 122 and 131, and vice versa.

The service layer 110 includes a plurality of service networks 111, 112, and 113. The service networks 111, 112 and 113 are operated using at least one or more virtual nodes 121, 122, 123, 124, 131, 132 and 133. In this case, the specific virtual node 124 can be mapped to a plurality of service networks 111 and 112, and vice versa.

Users recognize only the service networks 111, 112, and 113 included in the service layer 110 and use necessary services. Thus, users do not need substrate links, substrate nodes mapped to the service network 111, 112, 113. The users consider only the services and the performance that the service networks 111, 112 and 113 can provide and the service networks 111, 112 and 113 use the substrate links, The virtual nodes 121, 122, 123, 124, 131, 132, and 133 mapped to the node can be selected to provide the service.

Using the network virtualization architecture shown in FIG. 1, a particular physical network link, node 141, 142, 143, 144, 145, 146, 147, 151, 152, 153, 154, , It need not be mapped to the service network 111, 112, 113. It should also be noted that a particular physical network link, node 141, 142, 143, 144, 145, 146, 147, 151, 152, 153, 154 may be associated with a particular virtual network layer 120, May be mapped to another virtual network layer 120, service network 111, 112, 113 even after being mapped to the service network 111. [ Therefore, the physical network, the link, and the nodes 141, 142, 143, 144, 145, 146, 147, 151, 152, 153, and 154 can be used as efficiently as possible considering traffic, resource usage,

2 is a diagram illustrating a system model of a cellular network according to an exemplary embodiment.

2 (a) shows a structure in which antennas are concentrated in base stations 221, 222, and 223 of each cell in a cellular network composed of a plurality of cells. Each of the base stations 221, 222, and 223 provides a plurality of radio access schemes, and each radio access scheme can use a different frequency band. In this case, the coverage of each wireless access scheme may be different, and in FIG. 2 (a), the coverage 211, 213, 215 of the first wireless access scheme is the coverage 212, 214, ).

The terminals 231 and 232 may select either the first wireless access scheme or the second wireless access scheme to connect to the cellular network.

Each wireless access scheme is assigned a plurality of FAs (Frequency Allocation), and each FA is allocated for the user's service. Assuming that the wireless access scheme is OFDMA, each FA can be seen as a kind of resource block (RB).

When a resource is allocated to each of the terminals 231 and 232, a radio resource is allocated to an optimal user according to channel conditions for each FA for each radio access technique. According to one side, it is considered as a single user multi-input single-output (SU-MISO) environment that uses all the antennas in the base station to serve one user and uses the best known maximum transmission ratio (MRC) technique in MISO . Therefore, if the number of radio access schemes is r and the number of FAs is m, the system shown in FIG. 2 (a) can simultaneously serve a total of (rxm) users.

Figure 2 (b) shows the DU-RU separation structure. DU (Digital Unit) is a digital unit that performs baseband processing related to wireless access techniques. An RU (Radio Unit) is a radio unit that performs radio band processing associated with a radio access technique. According to one aspect, the RU may include an antenna unit, a received signal amplifier, and a frequency band converter. Here, the frequency band converter included in the RU is an apparatus for converting a received signal into an intermediate frequency band (IF) using an antenna unit. DU may include a frequency band converter, a modem. Here, the frequency band converter included in the DU is a device for converting a received signal of an intermediate frequency band into a baseband, and a modem is a device for processing a received signal converted into baseband.

According to one aspect, each cell 241, 242, 243 may include one DU and a plurality of RUs. One DU can be associated with multiple RUs. Here, each RU may support a plurality of radio access schemes using different frequency bands. Each cell 241, 242 and 243 is thus divided into the coverage areas 251, 252, 253, 254, 255 and 256 of the first radio access scheme and the coverage areas 261 and 262 , 263, 264, 265, 266).

Users who want to access the network are allocated resources by RU, wireless access scheme, FA, and receive services. At this time, if a number of RUs included in each cell is a, the number of radio access techniques available for each cell is r, and the number of FAs is m, a maximum of (a x r x m) users can simultaneously receive services.

A terminal connected to a specific RU in the DU-RU structure can receive an interference signal from another RU. In the DU-RU structure, the other RUs transmitting the interference signal are located at a relatively close position, and the number of other RUs transmitting the interference signal is large. However, the intensity of the interference signal can be considered to be small.

3 is a block diagram illustrating a structure of a resource allocation apparatus of a wireless network according to an exemplary embodiment.

The resource allocation apparatus 300 of FIG. 3 includes a connection scheme determination unit 310, a radio unit determination unit 320, and a radio resource allocation unit 330.

The resource allocation apparatus 300 of the wireless network shown in FIG. 3 provides a plurality of wireless access schemes. For example, the resource allocation apparatus 300 of the wireless network may provide Wibro and Long Term Evolution (LTE) as a wireless access scheme.

Of the wireless access schemes provided by the wireless network, the terminal 340 may support a plurality of wireless access schemes. The wireless access schemes that the terminal 340 can support are referred to as candidate access schemes. The wireless network may select one of the candidate access schemes supported by the terminal 340 and provide the service using the selected service wireless access scheme.

In this case, when the terminal 340 first accesses the wireless network, the access scheme determination unit 310 determines a service access scheme to be provided to the terminal 340 among a plurality of wireless access schemes.

According to one aspect, the access scheme determination unit 310 may select a service access scheme among a plurality of wireless access schemes according to a preference of the terminal 340. [ According to another aspect, the access scheme determination unit 310 determines a connection scheme corresponding to the pilot signal having the strongest received signal strength among the pilot signals corresponding to each wireless access scheme received by the terminal 340 as a service connection Technique.

According to one aspect, the wireless network shown in FIG. 3 may be provided using the DU-RU structure shown in FIG. 2 (b). In this case, DU and RU may be located physically apart from each other. In addition, each cell may include one DU and a plurality of RUs.

In this case, the radio unit determination unit 320 can select, among the plurality of RUs, a service radio unit for providing the service accessing technique to the terminal 340. According to one aspect, the radio unit determination unit 320 can select, as a service radio unit, an RU having the largest average intensity of a received signal among a plurality of pilot signals corresponding to each RU received by the terminal 340. [ According to this, if there is no shadow effect due to a special obstacle, the terminal 340 receives service from the nearest RU.

According to another aspect, the radio unit determination unit 320 can select the service radio unit according to the traffic of each RU.

The radio resource allocator 330 determines a service radio resource to be allocated to the terminal 340 among the determined radio access techniques and radio resources allocated to the determined RU. According to one aspect, the radio resource assignment unit 330 may allocate radio resources in a method of determining an optimal radio resource to be allocated to a specific terminal 340, or may allocate a radio resource to an optimal terminal It is also possible to allocate radio resources in a selection manner.

According to one aspect, the radio resource allocation unit 330 may allocate radio resources using a method of selecting an optimal terminal to which a specific radio resource is allocated. In this case, if the terminals are distributed at different positions, the state of the radio channel changes according to the distance from the RU, resulting in a fairness problem for each of the terminals. Therefore, the radio resource assignment unit 330 can use a proportional fair (PF) scheduling scheme to satisfy the fairness of each mobile station. According to the PF scheduling scheme, the radio resource allocation unit 330 can determine a service radio resource to be allocated to the terminal 340 according to Equation (1).

[Equation 1]

는 스케쥴링 기반 시스템에서 일반적으로 잘 알려져 있고, 사용자 공정성을 만족시켜 주기 위해서 널리 채택되어 있는 Proportional Fair(PF) 스케쥴러에 따른 사용자이고,

는 사용자 집합이고,

는 t 시점에서 k번째 사용자의 순간 전송률이고,

는 t 시점에서 k번째 사용자의 평균 수율을 의미한다.

는 하기 수학식 2와 같이 결정된다.
here,

(PF) scheduler, which is generally well known in scheduling-based systems and is widely adopted to satisfy user fairness,

Is a set of users,

Is the instantaneous transmission rate of the k-th user at time t,

Is the average yield of the kth user at time t.

Is determined according to the following equation (2).

&Quot; (2) "

는 사용자 평균 수율의 업데이트 윈도우 크기를 나타낸다.
here,

Represents the update window size of the user average yield.

According to one aspect, the resource allocation apparatus 300 of the wireless network can redetermine / change the service access scheme for the terminal 340 for the optimization of the radio resources even after the allocation of the radio resources. This is called Radio Access Technology Virtualization.

The concept of changing the service connection technique for the terminal 340 will be described with reference to FIG.

4 is a diagram illustrating a concept of changing a service access scheme in accordance with an exemplary embodiment.

FIG. 4 (a) shows a state before changing the service connection technique. 4 (a), five terminals 411, 412, 413, 414, and 415 are located in the coverage 410 of the RU 420. The RU can provide two different radio access schemes. The first radio access scheme is provided using a first frequency band 430 and the first frequency band 430 is divided into four sub frequency bands 431, 432, 433, and 434. The four terminals 411, 412, 413 and 414 connected to the wireless network use four sub frequency bands 431, 432, 433 and 434 of the first frequency band 430, respectively. Terminal 415, which is later connected to the wireless network, may use only the first wireless access scheme, but there is no available sub-frequency band in the first frequency band 430 allocated to the first wireless access scheme.

In this case, the resource allocation apparatus of the wireless network allocates the service to the at least one terminal that additionally supports the second wireless connection scheme among the four terminals 411, 412, 413, You can change the connection technique. That is, the resource allocation apparatus of the wireless network can change the service connection scheme of the dual mode terminal supporting other wireless access schemes. In this case, the terminal 415 may access the wireless network using the first wireless access scheme.

FIG. 4 (b) shows the service connection technique after the change.

The terminals 451, 452 and 454 can access the wireless network using the same sub-frequency bands 461, 462 and 464 as before. The terminal 455 newly connected to the wireless network can access the wireless network using the sub frequency band 463. [ Here, the terminals 451, 452, 454, and 455 all access the wireless network using the first wireless access scheme. In this case, the terminal 453 that previously used the sub-frequency band 463 and the first wireless access scheme can access the wireless network using the second wireless access scheme. The second radio access scheme is provided using a second frequency band 470 and the second frequency band 470 is divided into four sub frequency bands 471, 472, 473, and 474. [ The terminal 455 may access the wireless network using the sub frequency band 471 among the second frequency band 470 assigned to the second wireless access technique.

4, only one terminal 413 among the terminals 411, 412, 413, and 414 connected to the wireless network has been explained as a dual mode terminal. However, according to another embodiment, Lt; / RTI >

In this case, among the plurality of candidate access methods that each terminal can support, the access scheme determination unit 310 can receive channel state information on the candidate access scheme that is not determined by the service access scheme from each terminal. Here, the channel state information may include signal to interference and noise ratio (SINR) between the terminal 340 and the RU. The access scheme determining unit 310 may select a terminal to change the access scheme according to the channel state information and redetermine a candidate access scheme that is not determined as a service access scheme for the terminal to change the access scheme to a service access scheme.

Even if the virtualization of the wireless access scheme described in FIGS. 3 to 4 is performed, the radio resource allocation is inefficient when traffic load is unbalanced for each RU. In this case, the connection route of each terminal can be changed in consideration of the traffic for each RU. This is referred to as a connection path migration. Hereinafter, connection path migration will be described with reference to FIG.

5 is a diagram illustrating a concept of connection path migration according to an exemplary embodiment.

5A, the first RU 511 provides a first wireless access scheme and a second wireless access scheme to the terminals 512, 513, 516, 517 in the coverage 510. The first RU 511 may provide a first wireless access scheme using the first frequency band 530. [ The first frequency band 530 includes a plurality of sub frequency bands 531 and 432. The terminal 512 uses the sub frequency band 531 and the terminal 513 uses the sub frequency band 532 ) Is used. In addition, the first RU 511 may provide a second wireless access scheme using the second frequency band 533. Here, the second frequency band 533 is composed of a plurality of sub frequency bands 534 and 535, the terminal 517 uses the sub frequency band 534, the terminal 516 uses the sub frequency band 535, Lt; / RTI >

5A, the second RU 521 provides a first wireless access scheme and a second wireless access scheme to the terminals 522, 523 in the coverage 520. The second RU 521 may provide a first wireless access scheme using the first frequency band 540. [ The first frequency band 540 includes a plurality of sub frequency bands 541 and 542 and the terminal 522 uses a sub frequency band 541. The second RU 521 may also provide a second wireless access scheme using the second frequency band 543. Here, the second frequency band 543 is composed of a plurality of sub frequency bands 544 and 545, and the terminal 523 uses a sub frequency band 545.

In FIG. 5A, the first frequency band 530 and the second frequency band 533 allocated to the first RU 511 are all in use. Therefore, the first RU 511 has no frequency to allocate to the new terminals 514 and 515 that have entered the coverage 510 due to handover or the like.

In the DU-RU separation structure as shown in FIG. 5A, each of the RUs 511 and 521 and the DU are connected by a cable such as an optical cable. Therefore, the DU-RU frequency band allocation information and the user scheduling information are processed integrally in the DU. 5A, when the traffic between the RUs 511 and 521 is unbalanced, the DU selects the RUs selected in the network entry process for the new terminals 514 and 515 from the first RU 511 ), The connection path can be changed to the second RU 521.

In this case, although the intensity of the desired signal is smaller than that of the main access path, the terminals 514 and 515 serviced by migrating the access path are still transmitted at the signal-to-interference and noise ratio according to the state of the independently changing interference channel There is a user who can guarantee the efficiency, and the performance can be improved from the viewpoint of the network.

In addition, in order to reduce the complexity of the connection path migration, it is necessary to maintain the auxiliary access path information for each user, and not to carry out the operation for transferring all of the possible connection paths, It is also possible to perform an operation as a migration candidate.

5 (b) is a diagram showing frequency allocation after the connection path is migrated.

The new terminals 564 and 565 are located within the coverage 560 of the first RU 561 but connect to the second RU 581. Of the first frequency band 544 allocated to the second RU 581, the sub-frequency band 546 is not used but may be assigned and used by the terminal 546. [ Of the second frequency band 547 allocated to the second RU 581, the sub-frequency band 548 is not used but can be assigned to and used by the terminal 545.

The access path migration is performed for a specific RU after the virtual connection of the radio access scheme is performed and for the sub-frequency band when the sub-frequency bandwidth is not allocated in the specific radio access scheme.

In the case of access path migration, the remaining sub-frequency bands are not allocated for each RU and wireless access scheme. The RU of the sub-frequency band and the RU of the wireless access scheme are different, and the service connection scheme is the same, and there is data to be transmitted and the UEs which are not scheduled in the previous process are selected. The selected terminals receive the pilot signal from the RU of the corresponding sub-frequency band rather than the service RU thereof, and measure the SINR with respect to the received pilot signal.

Each DU receives the measured SINR information from the selected terminal and re-schedules the optimal terminal for that sub-frequency band based on the received SINR through the PF scheduling scheme. As a result, the main access path of the optimum user remapped to the sub-frequency band is the first RU, but the RU of the corresponding sub-frequency band changes its access path to receive the signal. Connection path migration is a virtualization that changes the connection route from the service RU to another RU. Since the resource is mapped again, it can be said to be a more active virtualization method than the virtual connection of the wireless access technique.

FIG. 6 is a flowchart illustrating a method of allocating a wireless network resource according to an exemplary embodiment.

In step 610, the wireless network resource allocation device determines whether the terminal first enters the wireless network. According to one aspect, a wireless network may provide a plurality of wireless access schemes to a terminal.

If the terminal enters the wireless network for the first time, the wireless network resource allocation apparatus can determine a service access scheme to be provided to the terminal. According to one aspect, the terminal may support a plurality of wireless access schemes. In this case, the wireless access schemes that the terminal can support are called candidate access schemes. The wireless network resource allocation apparatus can determine a service access scheme to be provided to the terminal from among a plurality of candidate access schemes.

According to one aspect, the wireless network may be a DU-RU disjoint structure. In this case, the DU (digital unit) performs baseband processing associated with the wireless access scheme provided by the wireless network, and the RU (radio unit) can perform radio band processing associated with the wireless access scheme provided by the wireless network have. DU and RU may be physically separated from each other and connected to each other by optical cable or the like, and a structure in which a plurality of RUs are connected to one DU is also possible.

The service connection scheme determined in step 620 may be provided using a structure in which a plurality of RUs are connected to one DU. In this case, in step 630, the wireless network resource allocation device may select a service radio unit from among a plurality of RUs to provide the service access technique to the terminal.

If it is determined in step 620 that the terminal does not enter the network for the first time, the wireless network resource allocation apparatus determines in step 640 whether or not the wireless resource is allocated to the terminal.

If the radio resource is not allocated, in step 650, the radio network resource allocation apparatus may allocate radio resources using a method of selecting an optimal terminal to allocate a specific radio resource. According to one aspect, the wireless network resource allocation apparatus can use a proportional fair (PF) scheduling scheme to satisfy the fairness of each terminal. According to the PF scheduling scheme, the wireless network resource allocation apparatus can determine a service wireless resource to be allocated to a corresponding terminal according to Equation (1).

In step 660, the wireless network resource allocation device determines whether or not there is an unassigned sub-frequency band. If there is an unassigned sub-frequency band, the wireless network resource allocation device may re-determine the service access scheme or service radio unit for the terminal.

In the embodiment shown in FIG. 6, an embodiment for redetermining a service access technique for a terminal and then redetermining a service radio unit is illustrated.

In step 670, the wireless network resource allocation device may redo the service access scheme for the terminal. The wireless network resource allocation apparatus can receive channel state information for a candidate access scheme not determined by the service access scheme among a plurality of candidate access schemes supported by the terminal from the terminal. In addition, the wireless network resource allocation apparatus can re-determine the candidate access scheme that can not be determined as the service access scheme according to the received channel state information as a service access scheme. Here, the channel state information may be the signal-to-interference and noise ratio of the wireless channel from the RU to the terminal supporting the candidate access scheme.

In step 680, the wireless network resource allocation device determines in step 670 whether there is a sub-frequency band that is still unassigned even though the wireless access scheme has changed.

If there are sub-frequency bands still not allocated, the wireless network resource allocation device may re-determine the service radio unit for the terminal in step 690. The wireless network resource allocation apparatus may reassign the service antenna unit among the plurality of RUs connected to the DU according to the traffic of the service radio unit.

According to one aspect, the wireless network resource allocation apparatus receives channel state information for a plurality of RUs from a terminal, and transmits an RU that is not determined as a service radio unit among a plurality of RUs to the service radio unit . ≪ / RTI >

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

300: Resource allocation device of a wireless network
310: connection method determination unit
320: radio unit determination unit
330: Radio resource allocation unit

Claims (19)

1. A resource allocation apparatus of a wireless network for providing a plurality of wireless access schemes,
A connection method determining unit determining a service access method to be provided to the terminal among the plurality of wireless access methods when the terminal first accesses the wireless network; And
Determining a service radio resource to be allocated to the MS among the radio resources allocated to the determined radio access scheme;
Lt; / RTI >
Wherein the service connection scheme is provided using a digital unit and a radio unit located remotely from the digital unit and the digital unit performs baseband processing associated with the service connection scheme, And performs the associated radio band processing. delete The method according to claim 1,
Wherein the service connection scheme is provided using a plurality of radio units,
A radio unit determination unit for selecting, from among the plurality of radio units, a service radio unit to provide the service connection technique to the terminal,
Further comprising: a resource allocation unit for allocating resources of the wireless network. The method of claim 3,
Wherein the radio unit determination unit redetermines the service radio unit among the plurality of radio units according to the traffic of the service radio unit. 5. The method of claim 4,
Wherein the radio unit determination unit receives channel state information for the plurality of radio units from the terminal, and determines, based on the channel state information, a radio unit that is not determined as the service radio unit among the plurality of radio units, And allocating resources to the wireless network. The method according to claim 1,
Wherein the terminal is connectable to the wireless network using a plurality of candidate access schemes among the plurality of wireless access schemes,
Wherein the access scheme determination unit determines the service access scheme among the plurality of candidate access schemes. The method according to claim 6,
Wherein the access method determination unit receives channel state information for a candidate access scheme that is not determined as the service access scheme among the plurality of candidate access schemes from the terminal and determines, based on the channel state information, And re-determines the candidate connection scheme as the service connection scheme. 8. The method of claim 7,
Wherein the channel state information includes a signal to interference and noise ratio (SINR). delete A method of allocating resources in a wireless network for providing a plurality of wireless access schemes,
Determining, when the terminal first accesses the wireless network, a service connection scheme to be provided to the terminal among the plurality of wireless connection schemes; And
Determining a service radio resource to be allocated to the terminal among the radio resources allocated to the determined radio access technique
Lt; / RTI >
Wherein the service connection scheme is provided using a digital unit and a radio unit located remotely from the digital unit and the digital unit performs baseband processing associated with the service connection scheme, A method of allocating resources in a wireless network that performs associated radio band processing. delete 11. The method of claim 10,
Wherein the service connection scheme is provided using a plurality of radio units,
Selecting, among the plurality of radio units, a service radio unit to provide the service connection technique to the terminal
Further comprising the steps of: 13. The method of claim 12,
Re-determining the service radio unit among the plurality of radio units according to the traffic of the service radio unit
Further comprising the steps of: 14. The method of claim 13,
Wherein the step of re-determining the service radio unit comprises the steps of: receiving channel state information for the plurality of radio units from the terminal; determining, from among the plurality of radio units, To the service radio unit. 11. The method of claim 10,
Wherein the terminal is connectable to the wireless network using a plurality of candidate access schemes among the plurality of wireless access schemes,
Wherein the determining of the service connection scheme determines the service connection scheme among the plurality of candidate connection schemes. 16. The method of claim 15,
Receiving, from the terminal, channel state information for a candidate access scheme not determined by the service access scheme among the plurality of candidate access schemes, and transmitting a candidate access scheme, which is not determined as the service access scheme, Recall by service connection technique
Further comprising the steps of: 17. The method of claim 16,
Wherein the channel state information includes a signal-to-interference and noise ratio (SINR). delete A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 10 and 12 to 17.

Images