KR101487486B1 - System and method for control of radio resources selection - Google Patents

Abstract

When the control system of the first base station interlocked with the mobile station controls the radio resources of the mobile station, the control system receives a service request message from the mobile station, Verify that the methods are the same. If it is different from the transmission scheme provided by the first base station, instructs handover to a second base station having a service type of a transmission scheme for overlapping with a service area of the first base station, And transmits a service request message so that the terminal can receive the service through the second base station.

Description

TECHNICAL FIELD [0001] The present invention relates to a radio resource selection control system and method,

The present invention relates to a radio resource selection control system and method of a terminal.

Generally, it manages how a TDD (Frequency Division Duplex) -FDD (TDD) selector of a base station operates a TDD / FDD integrated network or determines a handover of a terminal. However, such a TDD-FDD selector does not describe a specific method for determining a network transition after examining a plurality of variables related to a radio access bearer request.

Accordingly, the present invention provides a radio resource selection control system and method of a terminal that selectively controls radio resources to be connected to a terminal according to a service.

According to another aspect of the present invention, there is provided a method of controlling a radio resource of a terminal,

The control system of the first base station operating in cooperation with the terminal receives the service request message from the terminal; Confirming whether a transmission scheme for providing a service requested by the terminal and a transmission scheme provided by the first base station are identical based on the service type information included in the service request message; Directing a handover to a second base station having a service type of a transmission scheme for providing the service overlapping with a service area of the first base station, when the first base station is different from the transmission scheme provided by the first base station; And delivering the received service request message to the second base station.

The service request message may be transmitted through a Physical Uplink Control Channel (PUCCH).

The service type information may be included in the scheduling request parameter of the PUCCH.

If the service type information of the first base station is the same as the transmission scheme for providing the requested service, the step of providing the service requested by the first base station .

According to another aspect of the present invention, there is provided a method for controlling a radio resource of a terminal in a control system,

The method comprising: receiving terminal measurement information from a terminal in a superposed area of a cell by a first base station and a second base station; Measuring an amount of traffic for downlink of the terminal; And instructing the terminal to perform a handover to a base station having a preset transmission scheme if the measured amount of traffic is greater than a predetermined threshold value.

The measurement information may include identification information of a target cell to be served in the cell where the terminal is located, and signal strength transmitted from the target cell.

According to another aspect of the present invention, there is provided a system for controlling radio resources of a terminal located in an area of a first base station and a second base station,

The first base station provides a service in a first transmission scheme, the second base station provides a service in a second transmission scheme, and a service of a service to be used by the terminal based on a service request message transmitted through the PUCCH from the terminal A service type checking unit for checking whether a transmission method for providing a service by the first base station to which the terminal is connected is identical to a transmission method for providing a service requested by the terminal; If it is confirmed that the transmission type of the first base station is different from the transmission type for providing the service requested by the terminal in the service type identification part, the second base station, which is the same as the transmission method for providing the requested service, A handover request unit for requesting a handover of the mobile terminal; And checking whether the transmission type of the first base station is different from the transmission method of providing the service requested by the terminal in the service type confirmation unit or checking whether the service requested by the terminal after the terminal hand- And a service providing unit for providing the service.

And a service request message receiver for receiving a service request message having a scheduling request parameter including service type information transmitted from the terminal.

The amount of traffic for the downlink of the terminal and the amount of traffic for determining whether the terminal is handed over to the base station preset on the basis of the transmission information for the base station to which the terminal is connected and the measured amount of traffic And a measurement unit.

Wherein the handover requesting unit transmits a handover request message to a base station having a predetermined transmission scheme when a traffic amount for a downlink is greater than a predetermined threshold based on an amount of traffic for a downlink of the terminal, Handover may be requested.

According to the present invention, since the base station determines the network transition of the terminal in consideration of the service type information according to the uplink / downlink load of the network, it can prevent the server from being overloaded and improve the transmission speed of the network. It is possible to prevent concentration.

In addition, by requesting the terminal, FDD / TDD system information for network transition is transmitted only to a specific terminal, thereby improving network resource efficiency compared to a method of broadcasting system information to all terminals.

1 is an exemplary diagram illustrating a communication system environment according to an embodiment of the present invention.
2 is a structural diagram of a control system according to an embodiment of the present invention.
3 is a flowchart illustrating a method of selecting a radio resource according to the first embodiment of the present invention.
4 is a flowchart illustrating a method of selecting a radio resource according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

In this specification, a terminal includes a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS) An access terminal (AT), and the like, and may include all or some of functions of a mobile terminal, a subscriber station, a mobile subscriber station, a user equipment, and the like.

In this specification, a base station (BS) is an access point (AP), a radio access station (RAS), a node B, a base transceiver station (BTS) Mobile Multihop Relay) -BS, and may include all or some of the functions of an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.

Hereinafter, a system and a method for selectively controlling radio resources of a UE according to an embodiment of the present invention will be described with reference to the drawings.

1 is an exemplary diagram illustrating a communication system environment according to an embodiment of the present invention.

1, in an embodiment of the present invention, a terminal 100 includes a region for providing a service in an FDD transmission scheme (hereinafter also referred to as an FDD network) and a region for providing a service in a TDD transmission scheme (Hereinafter also referred to as a network) coexist with each other and are provided with services through interworking with the base stations 300-1 and 300-2. At this time, the terminal 100 can receive the service through both the FDD transmission method and the TDD transmission method to the dual mode terminal.

The base stations 300-1 and 300-2 operate in conjunction with the virtualization server 200 and the virtualization server 200 can monitor services provided to the terminal 100 through the FDD network or the TDD network. The base stations 300-1 and 300-2 can transmit and receive information to and from the FDD network or the FDD network 300 based on the type of service to be provided to the user and the system information at the request of the terminal 100 transmitted through the Physical Uplink Control Channel (PUCCH) And a control system 400 for selectively controlling connection to any one of the TDD networks. Here, it is assumed that the base station forming the FDD network is the first base station 300-1 and the base station forming the TDD network is the second base station 300-2.

A structure of a control system 400 that controls selective access to a network according to a type of service that the terminal 100 desires to provide to the user in the FDD / TDD coexistence network will be described with reference to FIG. In the embodiment of the present invention, the control system 400 is included in the base stations 300-1 and 300-2, but the present invention is not limited thereto.

2 is a structural diagram of a control system according to an embodiment of the present invention.

2, the control system 400 includes a service request message receiving unit 410, a service type checking unit 420, a handover request unit 430, a service providing unit 440, and a traffic amount measuring unit 450 ).

The service request message receiving unit 410 receives a service request message including information that the terminal 100 desires to receive the service using the scheduling request information through the PUCCH. For this, in the embodiment of the present invention, the format of the PUCCH is set as shown in Table 1 below.

PUCCH format content Modulation Scheme Number of bits per subframe One Scheduling Request (SR) QPSK 2

Here, the scheduling request parameter defines and adds a bit indicating a service type requested by a user in a 1-bit (1-bit) mode of 0 or 1 set according to whether a conventional uplink resource allocation is requested or not. For this, in the embodiment of the present invention, the service type is divided into a symmetric service and an asymmetric service.

The symmetric service can allocate uplink / downlink resources equally, and it can be exemplified by mVoIP, video phone, e-mail, game, and the like, which are mobile Internet telephones. The asymmetric service can allocate more resources to the downlink, for example, a video on demand (VOD) service, a broadcast service, or an internet service.

The bit information according to the service type is included in the scheduling request parameter so that the control system 400 of the base stations 300-1 and 300-2 can recognize the service requested by the terminal 100. [ Other parts of the PUCCH format in Table 1 are already known, and detailed description will be omitted in the embodiment of the present invention.

The service type checking unit 420 checks a scheduling request parameter among the PUCCHs received by the service request message receiving unit 410 and confirms the service type requested by the terminal 100. [ Based on the service type confirmed by the service type checking unit 420, the terminal 100 determines whether to provide a service through the currently connected base station or to request handover to another base station.

For example, if the terminal 100 is connected to the first base station 300-1 and requests to provide an asymmetric service, the control system 400 included in the first base station 300-1, The service type checking unit 420 can confirm that the corresponding terminal 100 needs handover to the second base station 300-2. However, if the terminal 100 is requested to provide a symmetric service in a state of being connected to the first base station 300-1, the service type checking unit of the control system 400 included in the first base station 300-1, (420) confirms that the base station can provide the service, and confirms that the handover is not necessary to the terminal (100).

In the exemplary embodiment of the present invention, the terminal 100 selects a base station to be connected according to a service type. However, the terminal 100 may select a base station to which the terminal 100 accesses according to the type of application used by the terminal 100 have. For example, if a user drives a preset application (e.g., VoIP, game, TV, etc.) using the terminal 100, a forced handover .

When the handover request unit 430 confirms that the handover of the terminal 100 is required by the service type checking unit 420, the handover request unit 430 instructs the terminal 100 to perform handover. The service request message received from the terminal 100 is transmitted to the base station to which the terminal 100 handover, and the terminal 100 reports the service requested by the terminal 100. In addition, the handover requesting unit 430 requests the terminal 100 to perform a handover based on a handover direction request of the traffic amount measuring unit 450 to be described later.

The service providing unit 440 provides the service requested by the user to the terminal 100. At this time, in case the terminal 100 handover from another base station, it receives service request information transmitted from another base station, and provides the terminal 100 with a service included in the received service request information.

The traffic amount measurement unit 450 transmits measurement information indicating that the terminal 100 is located in a region where the cells are now overlapped and transmits the traffic amount of the terminal 100 through the downlink wireless occupancy rate of the terminal 100 in the network . Here, it is already known that the traffic amount measuring unit 450 measures the traffic amount through the downlink wireless occupancy rate of the terminal, and detailed description thereof will be omitted in the embodiment of the present invention. The measurement information includes identification information of a target cell that is served by a cell in which the terminal 100 is located, and signal strength of a signal transmitted from the target cell.

The traffic amount measurement unit 450 determines whether to perform handover according to the amount of traffic of the downlink of the terminal 100, the transmission method of the base station, which is identified through the stored cell identifier, and the service type used by the terminal 100 . Here, in the virtualization structure in which the virtualization server 200 is provided, the information on the transmission mode of each base station can be confirmed with the cell identifier of the cell generated by the base stations 300-1 and 300-2. Therefore, if the amount of traffic measurement unit 450 determines only the amount of downlink traffic of the terminal 100, the information on the transmission method of the base station to which the terminal 100 is connected can be grasped without transmitting or receiving another information.

The traffic amount measuring unit 450 may determine that the amount of downlink traffic measured by the terminal 100 exceeds a preset threshold value and that the base station to which the terminal 100 providing the symmetric service is currently connected uses the FDD transmission method The traffic amount measurement unit 450 determines whether a symmetric service can be provided by the base station using the TDD transmission scheme according to a preset reference. In accordance with the determination, the transmission rate of the first base station 300-1 is lowered to provide a symmetric service continuously or a handover to the second base station 300-2 is determined.

In the embodiment of the present invention, the handover of the terminal 100 using the asymmetric service to another base station of the adjacent TDD transmission method will be described as an example.

A method of selecting radio resources of the UE 100 through the control system 400 will be described with reference to FIGS. 3 and 4. FIG. In the embodiment of the present invention, for convenience of explanation, it is assumed that the terminal 100 first accesses the first base station 300-1 serving as an FDD and provides a VOD service at the request of the user But it is not necessarily limited thereto.

3 is a flowchart illustrating a method of selecting a radio resource according to the first embodiment of the present invention.

3, after the terminal 100 establishes a network connection with the first base station 300-1 through a network connection procedure (S101), the terminal 100 provides a VOD service, that is, an asymmetric service through the PUCCH And transmits the service request message to the first base station 300-1 (S102).

When the service request message receiving unit 410 receives the service request message transmitted through step S101, the service type checking unit 420 checks the service type of the service requested by the terminal 100 included in the scheduling request parameter of the PUCCH (S103). The service type checking unit 420 determines whether the transmission scheme used by the first base station 300-1 to access the service through the step S101 is identical to the transmission scheme used by the terminal 100 Whether or not the terminal 100 needs to be handed over (S104).

If the service type checking unit 420 determines that a handover is required to the terminal 100, the handover request unit 430 transmits the handover request to the first base station 300-1 as the terminal 100 linked to the first base station 300-1 300-1 to the second base station 300-2 (S106). At the same time, the handover request unit 430 of the first base station 300-1 provides the service request information received in step S102 to the service providing unit 440 of the second base station 300-2 (S107). However, if the service type determination unit 420 determines that handover is not required to the terminal 100, the terminal 100 provides the requested service (S105).

When the terminal 100 performs handover from the first base station 300-1 to the second base station 300-2 through step S106, the second base station 300-2 transmits a hand The terminal 100 is connected to the second base station 300-2 through an over procedure (S108). Here, the handover procedure is already known, and a detailed description thereof will be omitted in the embodiment of the present invention.

The second base station 300-2 provides the system information to the connected terminal 100 in step S109 and the second base station 300-2 on the basis of the service request information transmitted from the first base station 300-1 in step S107, The service providing unit 440 provides a service to the terminal 100 (S110). The terminal 100 handing over to the second base station 300-2 provides the service provided by the service providing unit 440 to the user (S111). Here, the system information includes information indicating that the UE 100 can provide a service through the first transmission scheme and the second transmission scheme, uplink / downlink cell bandwidth information, uplink / downlink setting information , Random access parameters, uplink power control, and service type information including transmission scheme information for providing services and the like.

Hereinafter, a method for selecting a radio resource according to another embodiment of the present invention will be described with reference to FIG. In FIG. 4, the description is given without limiting how the base station 300 provides the service.

4 is a flowchart illustrating a method of selecting a radio resource according to a second embodiment of the present invention.

As shown in FIG. 4, the terminal 100 transmits measurement information to the traffic amount measurement unit 450 of the setting system 400 to inform that the cell is presently overlapped with the current cell (S200). Herein, the measurement information includes identification information of a target cell to be served by a cell in which the terminal 100 is located, and signal strength of a signal transmitted from the target cell.

The traffic amount measuring unit 450 measures the amount of downlink traffic of the terminal 100 in a region where the cells are overlapped (S201). Here, since the traffic amount measuring unit 450 can know the downlink wireless occupancy rate of the terminal 100, the amount of traffic can be measured based on the amount of traffic, and a detailed description of the traffic amount measuring method is omitted in the embodiment of the present invention . At the same time, the traffic amount measuring unit 450 also obtains information on the transmission method of the base station 300 through the cell identifier generated by the base station 300 stored in advance.

The traffic amount measuring unit 450 in the setting system 400 of the base station 300 determines whether the measured traffic amount of the downlink of the terminal 100 is greater than a preset threshold value (S202). If the downlink traffic amount is smaller than the threshold value, the base station 300 continuously delivers the service to the terminal 100 (S203). However, if the amount of traffic on the downlink is greater than the threshold, it means that traffic is concentrated on the downlink between the terminal 100 and the base station 300.

When the traffic amount measurement unit 450 receives the measurement information indicating that the mobile terminal 100 is in the cell overlap region, the base station to which the terminal 100 is currently connected determines whether the downlink traffic of the terminal 100 is greater than the threshold value . If the downlink traffic is greater than a preset threshold value, the traffic amount measurement unit 450 determines whether it is efficient to provide the service from another neighboring base station according to a preset reference (S203).

If it is determined in step S203 that the base station 300 connected to the current subscriber station 100 continuously provides the service without handover, the subscriber station 100 continuously provides the corresponding service by lowering the transmission rate of the traffic transmitted to the subscriber station (S204). However, if it is determined that handover is required to the neighboring base station, handover is requested to the terminal 100 (S205). The method of determining a handover or requesting a handover is already known, and a detailed description thereof will be omitted in the embodiment of the present invention.

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, It belongs to the scope of right.

Claims (12)

A method of controlling a radio resource of a terminal in a control system,
The control system of the first base station in cooperation with a terminal located at a position where the service area of the first base station and the service area of the second base station are superimposed on each other may transmit a Physical Uplink Control Channel (PUCCH) including a scheduling request parameter The method comprising: receiving a service request message transmitted over the network;
Determining whether the transmission scheme for providing the service requested by the terminal and the transmission scheme provided by the first base station are identical based on the service type information requested from the terminal based on the scheduling request parameter of the service request message; ;
Directing a handover to the second base station having a service type of a transmission scheme for providing the service, overlapping the service area of the first base station, when the first base station is different from the transmission scheme provided by the first base station; And
And transmitting the received service request message to the second base station
The radio resource control method comprising:
delete delete The method according to claim 1,
Wherein the service type information is information on a service type of either a symmetric service or an asymmetric service. The method according to claim 1,
In the step of verifying that the transmission schemes are identical,
If the service type information of the first base station is the same as the transmission scheme for providing the requested service, the first base station provides a service requested from the terminal
The radio resource control method comprising: delete delete A system for controlling radio resources of a terminal located in a region of a first base station and a second base station,
Wherein the first base station provides a service in a first transmission scheme and the second base station provides a service in a second transmission scheme,
A service type of a service to be used by the terminal based on a scheduling request parameter included in a service request message transmitted through the PUCCH from the terminal, and a transmission mode in which the first base station to which the terminal is connected provides a service, A service type checking unit for checking whether a transmission scheme for providing a service requested by the terminal is the same;
If it is confirmed that the transmission type of the first base station is different from the transmission type for providing the service requested by the terminal in the service type identification part, the second base station, which is the same as the transmission method for providing the requested service, A handover request unit for requesting a handover of the mobile terminal; And
The service type identification unit confirms that the transmission method of the first base station is different from the transmission method of providing the service requested by the terminal, or after the terminal hand-over to the second base station, Service Offering Service
≪ / RTI >
delete 9. The method of claim 8,
The amount of traffic for the downlink of the terminal and the amount of traffic for determining whether the terminal is handed over to the base station preset on the basis of the transmission information for the base station to which the terminal is connected and the measured amount of traffic Measuring part
≪ / RTI > 11. The method of claim 10,
Wherein the handover requesting unit transmits a handover request message to a base station having a predetermined transmission scheme when a traffic amount for a downlink is greater than a predetermined threshold based on an amount of traffic for a downlink of the terminal, A control system for requesting handover. 9. The method of claim 8,
Wherein the first transmission scheme or the second transmission scheme is one of a Frequency Division Duplex (FDD) transmission method and a TDD (Time Division Duplex) transmission method, and the terminal is a dual mode terminal.

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