JP5586053B2 - Radio resource management method in cognitive communication network system - Google Patents

Description

  The present invention relates to a cognitive communication network system in which communication terminals communicate with each other while dynamically reconfiguring communication methods and the like with a plurality of radio access networks, and more particularly to a radio resource management method in the communication network system. .

In recent years, research on cognitive radio technology has been actively promoted. Cognitive radio is a technology that aims to improve frequency utilization efficiency by grasping the current frequency utilization state using a technique such as sensing (Cognition) and dynamically changing the frequency allocation based on the result.
Cognitive radio can be roughly classified into two types. One is a heterogeneous approach. Heterogeneous type means that in an environment where multiple wireless systems coexist, the cognitive radio senses the wireless system that exists at that location, and selects the optimal wireless system that can be used on the spot, Can also be used in combination.

In addition to the information obtained by the terminal through sensing, the wireless usage status and average throughput information (which reflects not only the theoretical value but also the network congestion status), etc., are added to the wireless selection. Thus, the user can make a selection for obtaining a desired communication quality.
At the time of this selection, the user can select a low-congestion network that can be expected to have a throughput, so when viewed macroscopically, the user moves to a wireless system that is not being used, The degree of utilization between systems can be smoothed, and as a result, improvement in frequency utilization efficiency can be expected.

  The other is a frequency sharing approach. The frequency sharing type is a method in which a cognitive radio performs sensing, identifies a frequency band that is not used at that location, and uses that frequency band in combination with the radio system / MAC protocol that you want to use. is there. The introduction of this method also has social and technical difficulties, such as the fact that frequency band allocation has already been precisely determined for each application and whether it is possible to eliminate the influence of weak radio waves such as radio waves from satellites. Many.

As a common problem in the above two types of cognitive radio technologies, it is important to detect an existing radio system quickly and reliably. In this regard, the present inventors have proposed a cognitive radio cloud as an architecture using cognitive radio technology. (See Non-Patent Documents 1 and 2)
Many portions of this architecture are standardized in the standardization organization IEEE P1900.4. (See Non-Patent Document 3)

Regarding the cognitive radio communication method, Patent Documents 1 and 2 by the present applicant are cited. Further, Patent Documents 3 and 4 are cited as link aggregation methods in a cognitive radio communication system.
Patent Document 3 proposes a method for advertising to a communication terminal network identification information unique to the communication network or access point when link aggregation is performed between the communication terminal and a plurality of communication networks or access points. For this purpose, a network identification information advertising unit is provided in the network communication management means, and the communication terminal side determines the mode of link aggregation according to the network identification information and the rules provided by itself.
In Patent Literature 4, a base station and a communication terminal detect a wireless link capable of communication at the current location and notify the connection method reconfiguration management unit on the network side. A method for determining an aggregation mode and the like has been proposed. According to the determination, the network side and the communication terminal side reconstruct the connection method.

Japanese Patent Publication No. 2009-206933 Japanese Patent Publication No. 2009-206934 Japanese Patent Publication No. 2009-246875 Japanese Patent Publication No. 2010-135947

H. Harada et al, “A Software Defined CognitiveRadio System: Cognitive Wireless Cloud” IEEE Globecom 2007, November 2007 Miyamoto et al., “[Technology Exhibit] Development of Cognitive Wireless Cloud System-Collecting Wireless Information by Autonomous Decentralization-,” IEICE Technical Report, vol.109, no.155, SR2009-24, pp.13-18, July 2009 Moon IEEE P1900.4, “Architectural Building Blocks Enabling Network-Device Distributed Decision Making for Optimized RadioResource Usage inHeterogeneous Wireless Access Networks,” Internet URL http://grouper.ieee.org/groups/scc41/4/index.htm (August 2010 24 days search) 3GPP Technical Specification Group Services and System Aspects, “IP Multimedia Subsystem (IMS); Stage 2 (Release 9),” 3GPP TS23.228, V9.2.0, December 2009 Kentaro Ishizu, Takashi Murakami, Tsuyoshi Miyamoto, Philin Stanislove, Jang Ha Nguyen, Satoshi Son, Alemousg de Messiohanes, Hiroshi Harada, “Cognitive Wireless Router with Link Aggregation to Realize Heterogeneous Cognitive Radio,” Software Radio Research of IEICE Society, Vol.109, No.442, pp.167-174, March 2010 Kentaro Ishizu, Takashi Murakami, Tsuyoshi Miyamoto, Filin Stanislab, Hiroshi Harada, “Design of a frequency-sharing cognitive radio system with an out-of-band pilot channel system,” IEICE Software Radio Society, Vol.109, No.442 pp.37-44, March 2010

According to many prior art documents, a cognitive communication network system architecture and a method for realizing link aggregation have been proposed.
However, the previously proposed architecture required a new mechanism for exchanging the presence information of each entity, so it was not possible to combine an existing system with a cognitive communication network.

  In addition, when performing link aggregation, both nodes that perform communication need to support link aggregation, which makes it difficult to introduce the system into an existing system. Therefore, an aggregation proxy server that divides and integrates a link between an existing server and a cognitive terminal into a plurality of pieces has been proposed. Conventionally, the information related to the proxy has to be fixed on the network so that it does not need to be exchanged or can be exchanged via some kind of network.

  Therefore, the present invention proposes a method for exchanging information of each radio resource in a cognitive communication network system, and in particular, an object of the present invention is to provide a technique capable of mounting a cognitive communication network architecture on an existing system.

The present invention has been created in view of conventional problems, and communication terminals communicate with each other while dynamically reconfiguring the presence or absence of communication with at least a plurality of radio access networks or a communication method (hereinafter referred to as a communication method). The present invention provides a radio resource management method in a cognitive communication network system.
The cognitive communication network system includes a plurality of radio access networks and an upper communication network that provides at least a common platform for the radio access network, and the communication terminal and the radio access network are provided on the upper communication network. Presence information management means for managing information on the base station as presence information.

  Then, the presence information management means updates at least presence information related to the presence / absence of the communication terminal from the communication terminal by a communication protocol based on the presence information exchange method, and selects a radio access network used for communication, Alternatively, both means of network reconfiguration management means for reconfiguring at least one of the communication systems in the radio access network and radio access network reconfiguration management means for reconfiguring the communication system of the radio access network on each radio access network To update at least presence information related to the presence / absence of the base station.

  In the presence information related to the communication terminal, a user information group list classified for each user who uses the cognitive communication network is recorded, and the network reconfiguration unit subscribes to the user information group list, and the cognitive communication network system The information of all the communication terminals may be acquired.

  In the presence information related to the base station, the radio access network reconfiguration management unit generates and updates information on base stations belonging to its own radio access network as an operator information group list, and the network reconfiguration management unit Subscribe to the operator information group list, generate and update as an area information group list for each base station installation area, collate the location where the communication terminal is located with the installation area, and include it in the area information group list The presence information related to the base station to be acquired may be acquired.

  In the cognitive communication network system of the present invention, the communication terminal is configured to perform link aggregation in which a plurality of wireless links are simultaneously established to perform communication, and the network reconfiguration management means is configured to communicate with the communication protocol based on the presence information exchange method from the communication terminal. Requesting the start of link aggregation to the network reconfiguration management means, identifying the aggregation proxy server from the current link aggregation assignment status, and notifying the aggregation proxy server and the communication terminal of the start of link aggregation, The structure which has the step which comprises a link aggregation between a communication terminal and this aggregation proxy server may be sufficient.

  The present invention can also be provided as a cognitive communication network system including the radio resource management method described above.

By providing the above configuration, the present invention has the following effects.
In other words, by exchanging presence information using a communication protocol based on a presence information exchange method introduced in an existing system, it is possible to easily manage radio resources in a cognitive communication network, which has been a conventional problem. it can.
In particular, since presence information is stored on a higher-level communication network that provides a common platform for radio access networks, network reconfiguration management means, radio access network reconfiguration management means, and communication terminal entities in a cognitive radio cloud You can freely create, update, and subscribe to information.

  Recording a user information group list for presence information related to a communication terminal, and allowing the network reconfiguration means to subscribe to the user information group list so that the network reconfiguration means detects a communication terminal connected to the network. It is also possible to provide access according to access restrictions for various requests from the communication terminal and user situations.

  Presence information related to the base station is provided with an operator information group list and an area information group list, so that presence information related to the base station included in the area information group list can be acquired from the location where the communication terminal is located. The communication terminal can acquire information on neighboring base stations.

  By providing a notification path from the communication terminal to the aggregation proxy server via the network reconfiguration management means by the communication protocol based on the presence information exchange method, it becomes possible to appropriately arrange the aggregation proxy server as necessary. Implement link aggregation on existing systems. And the information of an aggregation proxy server can be simply transmitted now to a communication terminal.

1 is a configuration diagram of a cognitive communication network system according to the present invention. FIG. It is an architecture of a cognitive communication network system. Shows resource management and information provision using the presence management function. It is a figure explaining the communication regarding terminal information (41). It is a figure explaining the communication regarding AP information (42). It is a figure which shows communication and relevance regarding the update / subscription of each presence information. It is explanatory drawing which introduces a proxy into a cognitive communication network system. It is explanatory drawing which shows control of the link aggregation using SIP. It is a figure which shows matching with each entity of this cognitive communication network, and IMS.

Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings. The embodiment is not limited to the following.
FIG. 1 is a block diagram showing a specific example of a cognitive communication network system (1) according to the present invention. In the cognitive communication network, communication is performed from an upper communication network (10) that is a packet-based network and a plurality of radio access networks (20), (21), and (22) that provide a common platform for the upper communication network (10). A network is configured. Then, a cognitive communication terminal (hereinafter referred to as a communication terminal) (30) connected to the radio access network connects to the upper communication network (10). The host communication network is assumed to be an IP network such as the Internet, for example.

  In the cognitive communication network, as illustrated in the figure, in addition to the wireless LAN (20), WiMAX (21), mobile phone network (22), PHS, Bluetooth (registered trademark), etc., frequency, communication system, fee system, business The communication terminal (30) communicates with one or more different wireless access networks such as main parties while switching connection destinations and communication methods. At that time, it is a technology that recognizes the state of wireless use and aims to improve the frequency utilization efficiency.

  In order to realize this, the technology to search for available frequency / radio system and switch to the optimal system (heterogeneous type), unused frequency band / time slot, etc. are detected and no interference is caused to the existing system. The technology (frequency sharing type) that uses it in the range is used. Although the present invention mainly targets the cognitive communication network system based on the latter technique, the present invention may be applied to the former system or a system in which both are combined.

  Each wireless access network includes a plurality of base stations (BS) as known in the art, and performs wireless communication with the communication terminal (30). For example, a wireless LAN (not shown) may be connected to a lower layer of the upper wireless LAN (20) and the wireless access network may be hierarchized. Even in this case, by using an IP network capable of communication using the IP protocol, communication terminals connected to any radio access network can communicate end-to-end.

  In the cognitive communication network system of the present invention, the communication terminal (30) changes the connection-destination radio access networks (20) to (22) based on information on the communication state of the terminal, user preferences, and user context. Determine frequency switching and reconfiguration. Also, these pieces of information are reported to the communication management device (11) of the higher-level communication network (10) to enable operation in cooperation with the communication network side. In the communication management device (11), the information received from the communication terminal (30) and the status of the higher level network (10) and the radio access networks (20) to (22) are combined with the communication terminal (30). The communication method or the like can be determined and reconfigured.

  In the specific example in FIG. 1, it is assumed that the base station (20a) of the wireless LAN (20) is initially connected (31). When the communication terminal (30) moves out of the communication area of the base station (20a), the communication terminal (30) determines the next connection destination according to the communication state of the terminal, the user's preference, and the like. For example, if the base station (22a) of the cellular phone network (22) has the next priority, a reconfiguration process for switching to the connection (32) is performed. This result is transmitted to the communication management device (11), and the packet communication at the communication terminal (30) is continued by performing the reconfiguration process on the communication network side.

  On the other hand, the communication management apparatus (11) can also reconfigure the communication system with the communication terminal (30). For example, when the traffic on the mobile phone network (22) becomes excessive due to the monitoring of the state of the radio access network, the connection destination of the communication terminal (30) is switched to communication through the WiMAX (21). This reconfiguration result is notified to the communication terminal (30), and the communication terminal (30) also performs reconfiguration processing.

  In the case of a frequency sharing type cognitive communication network system, since an unused frequency band that is not used at the time of communication is used, when an original user of the frequency band performs communication, the communication is moved to a different frequency band. There is a need. In the communication terminal (30) and the communication management device (11), the frequency band to be used, the modulation scheme, and the like are reconfigured by acquiring the usage status of each frequency band.

  In the cognitive communication network system, various communication networks and frequency resources can be effectively utilized while the communication network side and the communication terminal cooperate with each other in consideration of user preferences as in this specific example.

Next, an IEEE 1900.4 network system, which is a technology that forms the basis of the present invention, will be described. FIG. 2 is a block diagram of a system architecture that has already been published.
The communication network side includes an upper network (10) and a plurality of radio access networks (RAN) that provide a common platform for the upper network (10). Here, four RANs of RAN1 to RAN4 (23) to (26) are illustrated. In the conventional system, a network reconfiguration manager (NRM: Network Reconfiguration Manager) (100) provided in the host network (10) and a terminal reconfiguration manager (TRM: Terminal Reconfiguration Manager) (300) provided in the communication terminal (30). 2), the decision making regarding the optimum use of wireless communication is managed.

That is, the network reconfiguration management unit (100) acquires information obtained from a RAN communication state acquisition unit (RMC: RAN Measurement Collector) (201) that acquires a communication state on the RAN and the terminal reconfiguration management unit (300). The communication method and the like are determined according to the above. The determined result is set by a RAN reconfiguration manager (RRM: RAN Reconfiguration Manager) (200) and notified to the terminal reconfiguration manager (300).
The terminal reconfiguration management unit (300) is also based on information from a terminal state acquisition unit (TMC: Terminal Measurement Collector) (303) that acquires the communication state and the like in the communication terminal and the network reconfiguration management unit (100). To determine the communication method. The determined result is set by a terminal reconfiguration controller (TRC: Terminal Reconfiguration Controller) (302) and notified to the network reconfiguration manager (100).

  In addition to this, the host network (10) is provided with an operator monitoring / operating unit (OSM: Operator Spectrum Manager) (101), and the network administrator monitors the network status and sets conditions relating to the determination of reconstruction. And so on. As shown in FIG. 1, it is desirable that the network reconfiguration management unit (100) and the operator monitoring / operation unit (101) are arranged as a communication management device (11). The communication management device (11) can be realized as a known server device.

  Here, the RAN reconfiguration management unit (200) is a processing unit that simply changes the setting so as to achieve the instructed reconfiguration, and is a communication node that is provided on the RAN and transmits an instruction to each base station of the RAN. However, it may be implemented in each base station. In the case of implementation, the RAN reconfiguration management unit (200) is a conceptual processing means, and each base station changes its setting according to an instruction from the network reconfiguration management unit (100) as an actual process. do it.

  The RAN communication state acquisition unit (201) is provided on the base station or the RAN and acquires the communication state in the base station. Here, the communication status includes communication volume, communication speed, usable frequency of the RAN, modulation method, information on jitter / error rate, base station position, use status of other frequency bands at the base station position, communication Any parameter that affects communication, such as the number of terminals, can be used.

  The RAN reconfiguration management unit (200) and the RAN communication state acquisition unit (201) may be provided in common for the plurality of RANs (23) and (24), or may be provided for each RAN (25) and (26). May be provided respectively. In addition, the RAN reconfiguration management unit (200) is not limited to the illustration, and the RAN communication state acquisition unit (201) may be provided for each RAN.

In the architecture of the cognitive communication network as described above, information acquired between each entity, that is, the network reconfiguration management unit (100), the RAN reconfiguration management unit (200), and the terminal reconfiguration management unit (300). It is necessary to carry out communications such as exchanges.
Technically, information can be exchanged by establishing some kind of communication between each entity, but it must be equipped with equipment added to the existing communication system, which is an obstacle to the introduction of a cognitive communication network system. It was.

In the present invention, an information exchange protocol necessary for realizing cognitive radio is designated as SIP (Session
It is proposed to design using an Initiation Protocol-based protocol. SIP is an IETF (The Internet Engineering Task Force, Internet URL http://www.ietf.org/) standard communication protocol for establishing a session between two or more entities, in IP phones and instant messengers. Used to control session start and end.

The implementation of the present invention is not limited to SIP, and any communication protocol based on a known presence information exchange method can be used. This communication protocol corresponds to a session layer protocol in the OSI reference model.
By using a known session layer protocol in this way, presence information can be exchanged using an existing communication system. Details of information exchange by SIP will be described below.

FIG. 3 shows resource management and information provision utilizing the presence management function. In this architecture, “terminal information” (41) and “AP (base station) information” (42) are stored as “presence information” (40) on the upper network.
The simplest example of presence information is information regarding presence / absence, terminal information (41) is presence information regarding presence / absence of communication terminal (30), and AP information (42) is presence / absence of base station. It includes at least presence information related to absence.

FIG. 4 shows communication related to the terminal information (41). The terminal information (41) is presence information corresponding to the communication terminal (30). The presence information is updated by the communication terminal (30). That is, each communication terminal (30) updates the state to “open” when communication is possible on the network (60), and updates the state to “closed” when communication is stopped (60).
The terminal information (41) that each communication terminal (30) updates through SIP is recorded as a user information group list (53). The user information group list (53) records the status of each terminal for each user.

When the network reconfiguration management unit (100) subscribes (61) to the user information group list (53), each terminal information is notified (62), and the state of each terminal is changed by the network reconfiguration management unit (100). It becomes possible to grasp.
These pieces of information are stored in SOAP (Simple Object), which is an application layer protocol of the OSI reference model.
Access Protocol).

  FIG. 5 shows communication related to the AP information (42). AP information (42) is presence information corresponding to a base station in each radio access network (RAN). The update of the presence information (63) (64) is performed by the RAN reconfiguration management unit (200) and the network reconfiguration management unit (100). The RAN reconfiguration management unit (200) updates the information collected on the network side, and the network reconfiguration management unit (100) updates the result of periodically collecting report information from the user.

Presence information subscriptions (65) and (66) are performed by the network reconfiguration management unit (100) through the operator information group list (51) and by the communication terminal (30) through the area information group list (52).
This presence information corresponds to an account that is valid only in the server that manages the presence information.
The account used for the AP information (42) is generated by the RAN reconfiguration management unit (200) when the operation of the base station of the radio access network is detected, and is deleted when the non-operation is detected.

The presence information in the AP information includes various information as shown in Table 1 in addition to the “open” and “closed” states as in the communication terminal.

The above-described presence information group list will be described in detail. FIG. 6 is a diagram illustrating communication and relevance regarding update / subscription of each presence information.
First, the operator information group list (51) is a presence list defined in units of operators, and is used for managing AP information (42) in units of operators. The AP information (42) is added to the presence list by the RAN reconfiguration management unit (200) as the list owner, and the subscription is performed by the network reconfiguration management unit (100).

  The network reconfiguration management unit (100) can collect the presence information of all base stations in the system by subscribing to the operator information group list (51) of each radio access network. Based on the collected AP information (42), the access point area is determined, and if there is no corresponding “area information” presence list, the AP information (42) is converted into the area information group list (52). Add to

The area information group list (52) is a presence list defined for each area, and is used for managing the AP information (42) for each area.
The AP information (42) is added to the presence list by the network reconfiguration manager (100) as the list owner, and the subscription is performed by the terminal reconfiguration manager (300) of the communication terminal (30).

The communication terminal (30) makes an area information inquiry to the network reconfiguration management unit (100) based on the scanning results of the neighboring access points of the terminal, thereby obtaining the area information group list (52) to be subscribed to. Identify.
By subscribing to the specified area information group list (52), AP information (42) corresponding to the area where the communication terminal (30) currently exists can be acquired.

  The network reconfiguration management unit (100) collects all terminal information (41) in the system by subscribing to the user information group list (53). Based on the collected terminal information (41), it becomes possible to provide services according to access restrictions and various situations of users from various requests from the communication terminal (30).

  The user information group list (53) is a presence list defined for each system, and is used for managing terminal information (41) in the system. The terminal information (41) is added to the presence list manually when a user is added.

The present invention provides a method for easily realizing communication between entities essential for constructing a cognitive communication network by adopting the presence information exchange method as described above.
The exchanged presence information is used for selecting a radio access network and a base station and switching communication methods as is well known. Non-Patent Documents 5 and 6 have been proposed by the present inventors regarding the architecture of a cognitive communication network system to be applied.

Among these, the present invention particularly discloses a configuration using SIP for link aggregation control.
In this cognitive communication network system, as shown in FIG. 7, an aggregation proxy server (hereinafter referred to as a proxy) (70) is arranged on a higher-level communication network (10). For example, a communication terminal (30) and an HTTP server (72) Link aggregation via a plurality of radio access networks (73) (74) (75) on the existing communication system.

  When the function of the present invention is introduced in the existing Internet, a proxy (70) capable of IP access by a global IP address and a proxy program (71) for realizing an aggregation proxy on the terminal (30) are installed. Can be realized.

  The proxy (70), which is a communication relay device, operates as a pseudo NAT (Network Address Translation) router, and uniquely manages a plurality of logical links in the direction of the communication terminal (30) for each terminal. As a result, the communication terminal (30) and the plurality of logical links on the communication terminal are recognized as a single IP node by service providers (such as the HTTP server (72)) on the Internet. Further, the proxy (70) distributes and aggregates traffic of the target application with a designated algorithm based on the number and quality of logical links established.

As shown in FIG. 8, in a configuration using the proxy (70) and the proxy program (71), aggregation is controlled using a SIP message. The communication terminal (30) notifies the network reconfiguration management unit (100) of a start request message (80) when the aggregation use starts.
The network reconfiguration management unit (100) specifies the proxy (70) to be allocated based on the current allocation status, notifies the proxy (70), and sends a start response message (81) to the communication terminal (30). To be notified.
Table 2 shows the contents of the start response message.

The communication terminal (30) forms an aggregation based on the connection information notified by the start response message (81), and notifies the network reconfiguration management unit (100) of an end notification message (82) after the aggregation is completed. To do. The network reconfiguration management unit (100) updates the allocation status based on the information notified by the end notification.

  According to the above configuration, link aggregation can be realized using the proxy (70) while using an existing system. In addition, the result of selecting the proxy (70) by the network reconfiguration management unit (100) can be easily notified to the communication terminal (30).

Finally, a configuration to be developed in IMS (see IP Multimedia subsystem Non-Patent Document 4) is proposed as the upper communication network (10) in the present invention.
FIG. 9 is a diagram illustrating the association between each entity of the cognitive communication network and the IMS.
The network reconfiguration management unit (100) on the network side can be implemented as an IMS application server (AS) and can trigger transmission and reception of information by itself, and can also be implemented as a user equipment (UE). To implement a unique additional service for the communication terminal (30).

  Further, the RAN reconfiguration management unit (200) is implemented as an application server as a node arranged in the radio access network. This is a node having the function of the RAN communication state acquisition unit (201) from the viewpoint of ease of implementation, and has a function of absorbing differences in vendor-dependent protocols such as statistical information and commands related to parameter adjustment.

When performing communication using a plurality of wireless access networks, it is necessary to authenticate at the time of connection or the like to authenticate that the user is a legitimate user and confirm whether roaming access is possible. Functions of an inter-RAN authentication server and an intra-RAN authentication server are required as nodes that assist the authentication on the network side. Since these functions have many parts that overlap with the functions of the CSCF node in IMS, I-CSCF is used as the inter-RAN authentication server, and P-CSCF is used as the intra-RAN authentication server, and the function differences peculiar to this authentication are obtained. The form to add is desirable.
In addition, an IMS client (UE) is mounted on the communication terminal (30) to serve as a gateway for efficiently acquiring information from each of the entities, and the terminal reconfiguration management unit (300 in the terminal) ), To the terminal reconfiguration setting unit (302) and the terminal state acquisition unit (303).

By introducing the entities as described above, the following three functions can be realized.
(1) Account authentication and access control The IMS side manages the accounts of users with cognitive radio terminals. This enables account authentication using the IMS authentication framework, and access control and roaming access control for each service on an account basis.
(2) Inter-entity communication When entities newly arranged on the IMS communicate with each other, the IMS presence service is introduced to reduce the communication load and to efficiently transmit information.
(3) Aggregation control When performing link aggregation using a combination of multiple links, if both parties that support communication support aggregation, this can be achieved by establishing multiple sessions and communicating. If one of the partners does not support aggregation, such as an existing Web server, for example, it is necessary to use a node called an aggregation proxy server to divide and merge sessions into 1: n and relay them. The SIP message is used for dynamic allocation of the aggregation proxy server. When a user uses an optimal aggregation proxy server each time, it is possible to optimize a communication path, and it is not necessary to allocate a fixed node for each user like Home Agent (HA) in Mobile IP, for example.

20a base station 30 communication terminal 40 presence information 41 terminal information 42 AP information 50 presence list 51 operator information group list 52 area information group list 53 user information group list 100 network reconfiguration manager 200 RAN reconfiguration manager 201 RAN communication status acquisition Part

Claims (4)

A method for managing radio resources in a cognitive communication network system in which a communication terminal communicates while dynamically reconfiguring presence / absence of connection with at least a plurality of radio access networks or a communication scheme (hereinafter referred to as a communication scheme or the like),
The cognitive communication network system has a plurality of radio access networks and at least an upper communication network that provides a common platform for the radio access networks;
On the higher-level communication network, there is provided presence information management means for managing the communication terminal and base station information of the radio access network as presence information,
For the presence information management means,
Updating at least presence information relating to the presence / absence of the communication terminal by a communication protocol based on a presence information exchange method from the communication terminal;
Selection of a radio access network used for communication or network reconfiguration management means for reconfiguring at least one of the communication methods in the radio access network, and radio for reconfiguring the communication method of the radio access network on each radio access network In the configuration for updating the presence information related to the presence / absence of the base station from both means of the access network reconfiguration management means ,
The communication terminal is configured to perform link aggregation in which a plurality of wireless links are simultaneously established to perform communication,
Requesting the network reconfiguration management means to start link aggregation from the communication terminal by a communication protocol based on the presence information exchange method;
The network reconfiguration management means identifying an aggregation proxy server from the current link aggregation assignment status and notifying the aggregation proxy server and the communication terminal of the start of link aggregation;
Configuring link aggregation between the communication terminal and the aggregation proxy server
Method of managing radio resources in a cognitive communication network system characterized by having a. In presence information relating to the communication terminal,
Record a user information group list for each user who uses the cognitive communication network,
The method for managing radio resources in a cognitive communication network system according to claim 1, wherein the network reconfiguration unit subscribes to the user information group list and acquires information of all communication terminals on the cognitive communication network system. In presence information related to the base station,
The radio access network reconfiguration management means generates and updates information of base stations belonging to its own radio access network as an operator information group list,
The network reconfiguration management means subscribes to the operator information group list, generates and updates as an area information group list for each installation area of each base station,
The radio resource in the cognitive communication network system according to claim 1 or 2, wherein the presence information on the base station included in the area information group list is acquired by collating the location where the communication terminal is located and the installation area. Management method. A cognitive communication network system comprising the radio resource management method according to any one of claims 1 to 3.

Images