JP4645338B2 - Wireless communication system, wireless control station, and service changing method used for them - Google Patents

Description

  The present invention relates to a radio communication system, a radio control station, and a service change method used therefor, and more particularly, to a service change method during communication started by a radio control station in a radio communication system.

  Conventionally, in a service using radio of a user terminal typified by a mobile phone, a service that can be used by a user existing in a certain cell is mainly the capability of the network that controls the cell in which the user exists, Depends on the radio capacity of the cell. Therefore, when adding a new service or changing characteristics of an existing service, it is necessary to consider the network capability and the radio capacity of the cell.

  When a service is added or changed using the procedure defined in the current 3GPP (3rd Generation Partnership Project), if the resources required for the requested service cannot be completely secured, the service is added or changed. The request will fail and the service will not be executed.

  Conventionally, when changing the service as described above, a service change procedure request message cannot be transmitted from the radio control station, and the communication between the core node (switching station) and the user is not performed via the radio control station. Only when the user wants to change the service, the radio control station follows the service change request start message transmitted from the core node.

  Since the trigger for this service change is irrelevant to the cell load situation and the position of the wireless terminal, for example, in a state where the cell load is high, even if there is a service change request for many resources such as a TV (video) phone, As a result, the probability of success is low. Also, for example, when a wireless terminal is located at a cell boundary far from the base station, even if there is a service change request that requires a lot of power, such as a TV phone, the probability of successful service setting is low as described above. It is the result.

  The service change procedure as described above is requested by the switching center when the user adds a service or changes the quality of service by the reconfiguration control unit provided in the radio base station control station and the base station. When the quality of service cannot be satisfied, there is a method of performing a service requested by a user with a resource that can be secured (see, for example, Patent Document 1).

  Also, in this procedure, before the user adds a service or changes the quality of service, the transmission rate that can be supported by the base station and the resources that the base station can secure are ensured between the base station and the radio base station control station. Information is notified from the base station to the radio base station control station. Thus, in the above procedure, the range in which the minimum quality of service can be guaranteed even when the requested resource cannot be completely secured in the procedure of changing the characteristics of the radio base station control station and the radio link. You can run the rebuild procedure.

JP 2003-199153 A

  In the service change without using the above-described conventional radio control station, there is a problem in that the cell load status is not grasped, resulting in a low service setting success probability. In addition, there is a problem that a service change without a conventional radio control station does not grasp the terminal position, resulting in a low service setting success probability.

  In the technique described in Patent Document 1 above, when the quality of the service requested by the switching center cannot be satisfied, the service requested by the user is only performed with the resources that can be secured, in other words, transmitted from the core node. Since the radio control station only follows the service change request start message, it cannot make a request to the core node to change the service, and the above problem cannot be solved.

  Therefore, an object of the present invention is to provide a radio communication system, a radio control station, and a service change method used for them that can solve the above-described problems and realize a service change procedure with a high success rate.

A radio communication system according to the present invention is a radio communication system including a radio control station that manages a cell in which a radio terminal exists, and a core node that provides the radio control station with a service change procedure for the radio terminal. And
The radio control station includes control means for controlling to transmit the service change request to the core node based on information related to the radio terminal.

The radio control station according to the present invention is a radio control station that manages a cell in which a radio terminal is present, and a service change procedure to the radio terminal is provided from a core node,
Control means for controlling to transmit the service change request to the core node based on information related to the wireless terminal.

The service change method according to the present invention is used in a radio communication system including a radio control station that manages a cell in which a radio terminal is present, and a core node that provides the radio control station with a service change procedure for the radio terminal. A service change method,
The radio control station executes control processing for controlling to transmit the service change request to the core node based on information related to the radio terminal.

  That is, the wireless communication system of the present invention is characterized in that, in a wireless communication system that provides a plurality of services, the wireless control station can start a service change during communication.

  More specifically, in the radio communication system of the present invention, the radio control station grasps the cell load of the cell in which the radio terminal exists in the cell load control unit in the radio control station. When the load on the cell in which the wireless terminal exists increases, the wireless control station transmits a service change request message for changing to a service that requires less resources to the core node.

  In addition, when the load on the cell where the wireless terminal exists becomes low, the wireless control station transmits a service change request message that allows a service that requires many resources to the core node. The core node that has received the service change request message from the radio control station changes the service of the radio terminal according to the existing service change procedure.

  As described above, in the radio communication system of the present invention, since the radio control station grasps the cell load situation, even when the cell load is high and the communication quality cannot be guaranteed, the voice communication is highly reliable. It is possible to provide a highly reliable service to many users by dynamically changing a service from a low-reliability service without disconnecting the communication.

  On the other hand, in the wireless communication system of the present invention, when a cell load is low and high communication quality can be ensured, an advanced service such as a TV (TV) phone is not lowered without communication being cut once. It is possible to change the service dynamically from the service and provide it to a user who needs an advanced service.

  In the existing system, the radio control station grasps the cell load situation in which radio terminals exist for various uses, while the core node provides a service change procedure to the radio control station. In this system, the radio control station sends a service change request message to the core node based on the cell load information of the radio terminal, so that the service change led by the radio control station can be performed, and the user can dynamically change the service during communication. Is possible.

  In the wireless communication system of the present invention, the wireless control station sends the service change request and executes the service change procedure, so that the service change can be performed with higher probability than when the core node takes the service change procedure. It will be possible to succeed.

  According to the present invention, a service change procedure with a high success rate can be realized by adopting the configuration and operation described below.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a wireless communication system according to an embodiment of the present invention. 1, the radio communication system according to the embodiment of the present invention includes a radio control station 1, a core node (switching station) 2, radio base stations 3-1 to 3-3, and radio base stations 3-1 to 3-3. 3 is composed of wireless terminals 4-1 to 4-7 in the cells A to C managed by -3.

  The radio control station 1 grasps the cell load of the cells A to C where the radio terminals 4-1 to 4-7 exist in the cell load control unit 11 in the radio control station 1. When the load on the cells A to C in which the wireless terminals 4-1 to 4-7 exist becomes high, the radio control station 1 requests the core node 2 to change to a service that does not require much resources. Send a change request message. In addition, when the load on the cells A to C in which the radio terminals 4-1 to 4-7 exist is reduced, the radio control station 1 allows the core node 2 to accept a service that requires a lot of resources. Send a change request message.

  When the core node 2 receives the service change request message from the radio control station 1, the core node 2 changes the services of the radio terminals 4-1 to 4-7 by the existing service change procedure.

  As described above, in the present embodiment, since the radio control station 1 knows the cell load situation, when the cell load is high and communication quality cannot be guaranteed, a reliable service such as a voice call is provided. A service can be dynamically changed from a low-reliability service without disconnecting the communication, and a high-reliability service can be provided to many users.

  On the other hand, when the cell load is low and high communication quality can be ensured, advanced services such as TV (telephone) telephones are dynamically serviced from low-level services without being disconnected once. It can be modified and provided to users who require advanced services.

  FIG. 2 is a block diagram showing a configuration of a wireless communication system according to an embodiment of the present invention. In FIG. 2, a radio communication system according to an embodiment of the present invention includes a radio control station 1, a core node (switching station) 2, radio base stations 3-1 to 3-3, and radio base stations 3-1 to 3- 3 is composed of wireless terminals 4-1 to 4-7 in the cells A to C managed by 3.

  FIG. 3 is a block diagram showing the configuration of the radio control station 1 of FIG. In FIG. 3, the radio control station 1 includes a cell load control unit 11 that monitors cell loads of the cells A to C, a core node connection unit 12 for connecting between the core nodes 2, and radio base stations 3-1 to 3-1. 3-3, a base station connection unit 13 for connecting to the 3-3.

  FIG. 4 is a sequence chart showing a service change procedure according to an embodiment of the present invention, FIG. 5 is a sequence chart showing exchange of wireless quality measurement results according to an embodiment of the present invention, and FIG. FIG. 7 is a sequence chart showing exchange of common cell quality measurement results according to an embodiment, FIG. 7 is a sequence chart showing exchange of individual terminal quality measurement results according to an embodiment of the present invention, and FIG. 8 is an embodiment of the present invention. FIG. 9 is a sequence chart showing transmission / reception of a wireless terminal location information report received from a GPS (Global Positioning System) system according to FIG. 9, and FIG. 9 is a sequence chart showing transmission / reception of a service setting request according to an embodiment of the present invention.

  FIG. 10 is a diagram illustrating an example of a service change request message transmission trigger according to an embodiment of the present invention. FIG. 11 is a diagram illustrating another example of a service change request message transmission trigger according to an embodiment of the present invention. With reference to FIGS. 2 to 11, description will be given of a change in service setting in the wireless communication system according to the embodiment of the present invention.

  The radio control station 1 uses the cell load control unit 11 in the radio control station 1 to grasp the cell load of each of the cells A to C used to implement radio resource allocation control for the radio terminals 4-1 to 4-7. ing. Further, as shown in FIG. 4, the core node 2 can start a service change procedure for executing a service change for the radio control station 1. In this case, when the radio control station 1 makes a service change request to the core node 2 based on the cell load information grasped by the cell load control unit 11, the service change procedure shown in FIG. 4 is started.

  That is, when the radio control station 1 makes a service change request to the core node 2 based on the cell load information known by the cell load control unit 11, the core node 2 transmits a service change procedure start message to the radio control station 1. (Refer to a1 in FIG. 4). When the radio control station 1 receives the service change procedure start message, the radio control station 1 executes the service change procedure with the radio terminals 4-1 to 4-7 (see a2 in FIG. 4). A service change procedure completion message is transmitted (see a3 in FIG. 4).

  In the present embodiment, the service change request is made based on the cell load information grasped by the cell load control unit 11 in the radio control station 1, but the radio shown in FIG. Radio quality measurement results transmitted from terminals 4-1 to 4-7, common cell quality measurement results transmitted from radio base stations 3-1 to 3-3 shown in FIG. 6, and individual terminal quality measurements shown in FIG. As a result, the position information reports of the wireless terminals 4-1 to 4-7 received from the GPS system shown in FIG.

  In the case of the radio quality measurement result, the radio control station 1 transmits a radio quality measurement request message to the radio terminals 4-1 to 4-7 (see b1 in FIG. 5), and the radio quality is transmitted from the radio terminals 4-1 to 4-7. When the measurement response message is sent (see b2 in FIG. 5), the wireless quality measurement result is acquired from the wireless quality measurement response message.

  In the case of the common cell quality measurement result, similarly to the above, the radio control station 1 transmits a common cell quality measurement request message to the radio terminals 4-1 to 4-7 (see c1 in FIG. 6). When a common cell quality measurement response message is sent from 4-1 to 4-7 (see c2 in FIG. 6), a common cell quality measurement result is acquired from the common cell quality measurement response message.

  Further, in the case of the individual terminal quality measurement result, similarly to the above, the radio control station 1 transmits the individual terminal quality measurement request message to the radio terminals 4-1 to 4-7 (see d1 in FIG. 7). When the individual terminal quality measurement response message is transmitted from 4-1 to 4-7 (see d2 in FIG. 7), the individual terminal quality measurement result is acquired from the individual terminal quality measurement response message.

  On the other hand, in the case of the position information report of the wireless terminals 4-1 to 4-7 received from the GPS system or the like, the wireless terminals 4-1 to 4-7 acquire the wireless terminal position information from the GPS system (see e1 in FIG. 8). ) Since the wireless terminal location information report message is transmitted to the wireless control station 1 (see d2 in FIG. 7), the wireless control station 1 acquires the wireless terminal location information report from the wireless terminal location information report message.

  In the above four cases, the radio control station 1 uses the acquired radio quality measurement results, common cell quality measurement results, individual terminal quality measurement results, location information reports of the radio terminals 4-1 to 4-7, and the like. Then, a service change request is made to the core node 2.

  The cell load control by the cell load control unit 11 in the radio control station 1 described above, the service change procedure during communication started by the core node 2 shown in FIG. 4, the radio of the radio terminals 4-1 to 4-7 shown in FIG. Those skilled in the art will know the quality measurement, the common cell quality measurement of the radio base station 1 shown in FIG. 6, the individual terminal quality measurement shown in FIG. 7, and the location information acquisition methods of the radio terminals 4-1 to 4-7 shown in FIG. Since it is well known to the present invention and is not directly related to the present invention, its detailed description is omitted.

  In FIG. 9, the core node 1 notifies a plurality of services that request communication in advance by a service setting request message when communication with the wireless terminals 4-1 to 4-7 is started (see f1 in FIG. 9). The radio control station 1 performs resource allocation control during the service setting procedure (see f2 in FIG. 9), selects one service from the plurality of services based on the calculation of the cell load status (see f3 in FIG. 9), and performs service. A setting procedure is executed (see f4 in FIG. 9), and a service setting procedure completion message is started in the core node 2 (see f5 in FIG. 9).

  First, it is assumed that the load on the cell A is high and a low-level service such as voice communication is provided to the user. After that, as shown in FIG. 10, when the cell load of the cell A in which the corresponding wireless terminals 4-1 to 4-4 exist is below a certain threshold (Th1) for a certain time (Ti1), the wireless control station 1 Therefore, a service change request message for switching to the advanced service is transmitted to the core node 2 by comparing with a plurality of service types notified from the core node 2 in advance.

  The core node 2 starts a service request procedure according to the service change request message from the radio control station 1, and provides a high-level service such as a TV phone to the user as shown in FIG.

  On the other hand, it provides users with a low cell load and high-level but low-reliability service such as a video phone (assuming a low-reliability service because the quality of the product is greatly degraded when the cell load increases) Assume that After that, as shown in FIG. 11, when the cell load of the cell A in which the corresponding wireless terminals 4-1 to 4-4 exist exceeds a certain threshold (Th2) for a certain time (Ti2), the wireless control station 1 Compared with a plurality of service types notified from the core node 2, a service change request message for switching to a highly reliable service is sent to the core node 2 in order to provide the user with a highly reliable service such as voice communication. To do.

  The core node 2 starts a service request procedure in accordance with the service change request message from the radio control station 1, and provides a highly reliable service to the user as shown in FIG. In addition, this procedure can reduce the load of the whole cell A as a result, and can improve the communication quality of all the radio | wireless terminals 4-1 to 4-4 in the cell A.

  In this way, in this embodiment, since the radio control station 1 has initiated the service change procedure, a service change procedure with a high success rate can be realized. In this embodiment, since services are provided to the wireless terminals 4-1 to 4-7 according to the loads on the cells A to C, it is allowed to use advanced services only when possible. Therefore, the cost for each of the wireless terminals 4-1 to 4-7 is reduced, and the load on the system can be reduced.

  FIG. 12 is a sequence chart showing a service change procedure following an inter-system handover according to another embodiment of the present invention. The configuration of the radio communication system and the configuration of the radio control station according to another embodiment of the present invention are the same as the configuration of the radio communication system according to the embodiment of the present invention shown in FIG. 2 and the configuration of the radio control station 1 shown in FIG. Therefore, the description thereof is omitted. Moreover, in the radio | wireless communications system by the other Example of this invention, the operation | movement of one Example of this invention mentioned above is further devised about the service change request transmission opportunity.

  In FIG. 12, instead of the cell load control by the cell load control unit 11 in the radio control station 1 according to another embodiment of the present invention, radio terminal quality reports from the radio terminals 4-1 to 4-7 (see FIG. 5) Is used.

  As an example of the wireless terminal quality to be used, improvement of wireless quality [Ec / No, Received Signal Code Power (RSCP), etc.] of neighboring cells of a network that provides only voice service is taken as an example.

  Originally, the improvement in radio quality of neighboring cells of a network that provides only voice service provides intersystem handover to that network, but the handover destination network does not provide advanced services such as videophones. . For this reason, in this embodiment, as shown in FIG. 12, inter-system handover is provided together with the service change procedure.

  That is, when the radio control station 1 receives the radio terminal quality measurement result report message from the radio terminals 4-1 to 4-7 (see g1 in FIG. 12), the radio control station 1 sends a radio terminal quality measurement result report from the radio terminal quality measurement result report message. Based on the acquired wireless terminal quality measurement result report, a service change request message is transmitted to the core node 2 (see g2 in FIG. 12).

  When receiving a service change request from the radio control station 1, the core node 2 transmits a service change procedure start message to the radio control station 1 (see g3 in FIG. 12). When the radio control station 1 receives the service change procedure start message, the radio control station 1 performs the service change procedure with the radio terminals 4-1 to 4-7 (see g4 in FIG. 12). A service change procedure completion message is transmitted (see g5 in FIG. 12). Thereafter, inter-system handover is performed among the radio control station 1, the core node 2, and the radio terminals 4-1 to 4-7 (see g6 in FIG. 12).

  As described above, in this embodiment, since inter-system handover can also be performed, inter-system handover to a network that does not support a TV phone or the like can be performed in a single procedure.

  FIG. 13 is a diagram illustrating a service provision dependent on a wireless terminal location according to another embodiment of the present invention. The configuration of the radio communication system and the configuration of the radio control station according to another embodiment of the present invention are the configuration of the radio communication system according to the embodiment of the present invention shown in FIG. 2 and the configuration of the radio control station 1 shown in FIG. Since it is the same as that, its description is omitted. Moreover, in the radio | wireless communications system by another Example of this invention, the operation | movement of one Example of this invention mentioned above is further devised about the service change request transmission opportunity.

  In FIG. 13, in this embodiment, a wireless terminal location information report (see FIG. 8) received from a GPS system or the like is used. There is a large difference in the power allocated to the radio terminal 4 between the location where the location of the radio terminal 4 is close to the radio base station 3-1 and the location of the cell boundary far from the radio base station 3-1.

  For this reason, an advanced service such as a TV phone that requires a large amount of power is provided in a place close to the radio base station 3-1 (TV phone zone), and a place at a cell boundary far away from the radio base station 3-1 (voice communication) In the zone), it is possible to provide a service depending on the location information of the wireless terminal 4 in the cell A shown in FIG. 13 such as providing a highly reliable service such as voice communication with low power consumption.

  In providing the service depending on the location information of the wireless terminal 4, instead of the terminal wireless terminal location information report received from the GPS system or the like shown in FIG. 8, the RTT (Round) of the wireless quality measurement result shown in FIG. Trip Time) may be used.

It is a block diagram which shows the structure of the radio | wireless communications system by embodiment of this invention. It is a block diagram which shows the structure of the radio | wireless communications system by one Example of this invention. FIG. 3 is a block diagram showing a configuration of a radio control station in FIG. 2. It is a sequence chart which shows the service change procedure by one Example of this invention. It is a sequence chart which shows transmission / reception of the radio | wireless quality measurement result by one Example of this invention. It is a sequence chart which shows transfer of the common cell quality measurement result by one Example of this invention. It is a sequence chart which shows transmission / reception of the separate terminal quality measurement result by one Example of this invention. It is a sequence chart which shows transmission / reception of the radio | wireless terminal location information report received from the GPS system by one Example of this invention. It is a sequence chart which shows delivery of the service setting request | requirement by one Example of this invention. It is a figure which shows an example of the service change request message transmission opportunity by one Example of this invention. It is a figure which shows the other example of the service change request message transmission opportunity by one Example of this invention. It is a sequence chart which shows the service change procedure following the hand-over between systems by the other Example of this invention. FIG. 6 is a diagram illustrating service provision depending on a wireless terminal location according to another embodiment of the present invention;

Explanation of symbols

1 radio control station
2 Core node 3-1 to 3-3 Wireless base station 4,4-1 to 4-7 Wireless terminal
11 Cell load controller
12 Core node connection
13 Base station connection
AC cell

Claims (21)

A radio communication system comprising a radio control station that manages a cell in which a radio terminal exists, and a core node that provides a service change procedure for the radio terminal to the radio control station,
A radio communication system, wherein the radio control station has control means for controlling to transmit the service change request to the core node based on information related to the radio terminal.   2. The radio according to claim 1, wherein the control unit monitors a load state of a cell in which the radio terminal exists and controls to transmit the service change request to the core node according to a monitoring result. Communications system.   The information related to the radio terminal is at least one of a radio quality measurement result, a common cell quality measurement result, an individual terminal quality measurement result, and a location information report in the radio terminal. The wireless communication system according to 1.   The control means transmits a change request to a service that requires less resources to the core node when the load of the cell in which the wireless terminal exists becomes high, and the load of the cell in which the wireless terminal exists The wireless communication system according to any one of claims 1 to 3, wherein a control request for changing to a service that requires a large amount of resources is transmitted to the core node when it becomes low.   The radio communication system according to any one of claims 1 to 4, wherein the radio control station performs a handover after performing the service change procedure.   The radio communication system according to claim 1, wherein the control means controls to transmit a change request to a service depending on position information of the radio terminal in the cell to the core node.   The control means transmits a request to change to a service that requires a lot of power when the location is close to the radio base station to the core node, and the power consumption to be allocated when the location is a cell boundary far from the radio base station. The wireless communication system according to claim 6, wherein control is performed so that a change request for a small number of services is transmitted to the core node. A radio control station that manages a cell in which a radio terminal exists, and a procedure for changing a service to the radio terminal is provided from a core node,
A radio control station, comprising: a control unit configured to control the service change request to be transmitted to the core node based on information related to the radio terminal.   9. The radio according to claim 8, wherein the control unit monitors a load state of a cell in which the radio terminal exists and controls to transmit the service change request to the core node according to the monitoring result. Control station.   The information related to the radio terminal is at least one of a radio quality measurement result, a common cell quality measurement result, an individual terminal quality measurement result, and a location information report in the radio terminal. 8. The radio control station according to 8.   The control means transmits a change request to a service that requires less resources to the core node when the load of the cell in which the wireless terminal exists becomes high, and the load of the cell in which the wireless terminal exists The radio control station according to any one of claims 8 to 10, wherein when it becomes low, control is performed so as to transmit a change request to a service that requires many resources to the core node.   The radio control station according to any one of claims 8 to 11, wherein a handover is performed after performing the service change procedure.   9. The radio control station according to claim 8, wherein the control means controls to transmit a change request to a service depending on position information of the radio terminal in the cell to the core node.   The control means transmits a request to change to a service that requires a lot of power when the location is close to the radio base station to the core node, and the power consumption to be allocated when the location is a cell boundary far from the radio base station. The radio control station according to claim 13, wherein control is performed so that a change request for a small number of services is transmitted to the core node. A service change method used in a radio communication system comprising a radio control station that manages a cell in which a radio terminal exists and a core node that provides a procedure for changing a service to the radio terminal for the radio control station,
The service change method, wherein the radio control station executes a control process for controlling to transmit the service change request to the core node based on information related to the radio terminal.   16. The service according to claim 15, wherein the control process monitors a load state of a cell in which the wireless terminal is present, and controls to transmit the service change request to the core node according to the monitoring result. Modification method.   The information related to the radio terminal is at least one of a radio quality measurement result, a common cell quality measurement result, an individual terminal quality measurement result, and a location information report in the radio terminal. 15. The service changing method according to 15.   The control process transmits a request to change to a service that requires less resources to the core node when the load of the cell in which the wireless terminal exists increases, and the load of the cell in which the wireless terminal exists The service change method according to any one of claims 15 to 17, wherein a control request for changing to a service that requires a lot of resources is transmitted to the core node when the value is low.   19. The service change method according to claim 15, wherein the radio control station performs a handover after performing the service change procedure.   16. The service change method according to claim 15, wherein the control process performs control so as to transmit a change request to a service depending on position information of the wireless terminal in the cell to the core node.   The control process transmits a change request to a service that requires a large amount of power when the location is close to the radio base station to the core node, and the power consumption to be allocated when the location is a cell boundary far from the radio base station. 21. The service change method according to claim 20, wherein control is performed so that a change request to a small number of services is transmitted to the core node.

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