KR100968635B1 - Apparatus and method for checking the terminal connection in wireless telecommunication system - Google Patents

Abstract

The present invention relates to an apparatus and method for checking a connection state of a terminal in a wireless communication system.

According to the present invention, the base station transmits the terminal identification information and the terminal access information to the terminal corresponding to a predetermined condition, and whether the terminal corresponding to the terminal identification information performs the operation corresponding to the terminal access information; By determining this, the base station can have an effect of actively knowing the connection state of the terminal.

Description

Apparatus and method for checking the terminal connection in wireless telecommunication system}

The present invention relates to an apparatus and method for checking a connection state of a terminal in a wireless communication system, and more particularly, a base station uses a MAC (Media Access Control) management message in a wireless communication system conforming to the IEEE 802.16d / e standard. The present invention relates to an apparatus and a method for checking a connection state of a terminal.

When the terminal enters the network for the first time, the terminal goes through a process of downlink channel scanning, base station synchronization, parameter acquisition, initial ranging, basic capability negotiation, terminal authentication, and key exchange. You will register at. The terminal performs periodic ranging to determine whether the terminal is connected to the base station even after the initial network entry is completed.

1 is a flowchart illustrating such a process. Hereinafter, a method for checking a connection state of a terminal according to the prior art will be described with reference to FIGS. 1 to 3.

Referring to FIG. 1, after completion of initial network entry, the UE transmits a randomly selected periodic ranging code to a periodic ranging region provided by the base station every frame (step S110).

Then, the base station receives the ranging slot information (OFDMA symbol number, subchannel number, etc.) where the ranging code transmitted by the terminal is located and the RNG-RSP (Ranging Response) message including the ranging code to the terminal. Transmit (step S120). However, in this case, since the base station cannot know which terminal has transmitted the periodic ranging code (ranging code is a resource shared by all terminals), as shown in FIG. 2, the RNG-RSP message is broadcast to all terminals. Cast.

Then, each UE analyzes ranging code attributes included in the RNG-RSP message (see FIG. 3) to check the ranging slot information and the ranging code to determine whether the RNG-RSP message corresponds to itself. Check whether or not. If the RNG-RSP message corresponds to the UE, the UE checks the ranging status included in the RNG-RSP message to determine whether the ranging is successful or not (step S). S130).

However, the method for checking a connection state of a terminal according to the related art is a method of checking whether a terminal is currently connected to a base station as described above, and the base station determines whether a management target terminal registered to the base station is currently normally connected. There is a problem that can not be confirmed.

Accordingly, there is a problem that the base station cannot efficiently manage radio resources such as call admission control, load control, and power control.

The present invention was devised to solve the above problems, and an object of the present invention is to provide an apparatus and method for enabling a base station to actively check the connection state of terminals managed by the base station.

Another object of the present invention is to provide an apparatus and method for easily knowing the access state of a terminal while maintaining compatibility with an existing system by including new information for checking the access state of the terminal in an existing MAC management message.

It is still another object of the present invention to provide an apparatus and method for identifying a connection state of a terminal accurately and quickly by selecting terminals corresponding to a predetermined condition and inducing an invited ranging only to the corresponding terminal.

For the above purpose, a terminal connection state checking apparatus in a wireless communication system of one embodiment of the present invention includes a terminal connection checking unit for searching for a terminal corresponding to a preset terminal connection checking condition; A message generator for generating a message including terminal identification information and terminal access confirmation information on the searched terminal; A transmitter for transmitting the generated message; And a receiving unit which receives information corresponding to the transmitted message from the terminal, wherein the terminal connection confirmation unit performs an operation corresponding to the terminal access confirmation information by a terminal corresponding to the terminal identification information from the received information. It is characterized by checking whether the terminal is connected by determining whether or not.

On the other hand, the terminal connection status checking method in a wireless communication system of one embodiment of the present invention includes the steps of: searching for a terminal corresponding to a preset terminal connection checking condition; Transmitting a UL-MAP (UL-MAP) message including terminal identification information and an Invited Ranging Region information for the searched terminal; Receiving a ranging code through the encoded ranging region; Transmitting a ranging response message (RNG-RSP) message including the ranging code and the terminal access confirmation information; And checking whether the searched terminal is connected by receiving information corresponding to the terminal access confirmation information.

In addition, a terminal access state checking method in a wireless communication system according to another aspect of the present invention includes: transmitting a message including terminal identification information and terminal access confirmation information for a terminal for confirming access; And determining whether the terminal is connected by receiving information in response to the message from the terminal corresponding to the terminal identification information, and determining whether to perform an operation corresponding to the terminal access confirmation information. It is done.

Accordingly, the present invention has an effect that the base station can efficiently manage the connection state of the terminals registered to it.

In addition, the present invention is effective to know the access state of the terminal by selecting the terminals corresponding to the preset terminal access confirmation condition to induce the ranging, and determine whether the base station performs the operation required by the base station; Has

In addition, the present invention has the effect that the base station can actively check the connection state of the terminal while effectively maintaining the compatibility with the existing system to utilize the radio resources efficiently.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. For reference, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted in the following description.

First, Figure 4 is a schematic diagram illustrating a terminal connection status check method according to the present invention.

Referring to Figure 4 briefly described the gist of the present invention, unlike the prior art (see Figure 2) in which the terminal checks its own connection, the present invention is selected by the base station to the terminal that needs to confirm the connection to the terminal Actively checks whether the UE is normally connected by requesting the operation and checking the result.

Hereinafter, an apparatus and method for checking a terminal connection state according to the present invention will be described in detail with reference to FIGS. 4 to 9.

5 is a block diagram of an apparatus for checking a terminal connection state according to an embodiment of the present invention, and FIG. 6 is a flowchart illustrating a method for checking a terminal connection state according to an embodiment of the present invention. For reference, the terminal access state check apparatus according to the present invention may be implemented by the base station itself or may be implemented as part of the base station.

As shown in FIG. 5, the terminal connection status checking apparatus 500 according to the present invention includes a terminal connection checking unit 510, a message generating unit 520, an information reading unit 530, a transmitting unit 540, and a receiving unit ( 550) and the like.

The terminal access checker 510 checks the access status of the terminals registered in the corresponding base station. In detail, the terminal access checker 510 may perform CQI (Channel Quality) for a predetermined time from a predetermined terminal when there is no bandwidth request for a predetermined time from the predetermined terminal or when there is no traffic associated with the predetermined terminal. Indicator) If a predetermined condition (terminal confirmation condition) is met, such as when transmission power information (Tx Power codeword) is not transmitted, the terminal determines whether the terminal is normally connected to the base station. To this end, the terminal access confirming unit 510 transmits identification information (eg, Basic CID) of the corresponding terminal and terminal access confirming information for confirming the access state of the corresponding terminal to the message generator 520.

The message generator 520 generates a message to be transmitted to the terminal based on the information transmitted from the terminal access checker 510. Media Access Control (MAC) management messages that can be preferably used in connection with the present invention include UL-MAP (Uplink MAP) messages, RNG-RSP (Ranging Response) messages, and the like, which will be described in detail below.

The transmitter 540 transmits the message generated by the message generator to the terminal. Then, the terminal receives the message transmitted in this way and performs the corresponding operation. For example, the terminal transmits a ranging code in response to an Invited Ranging request transmitted from the base station, or appropriately performs an operation required by the base station to confirm the access of the terminal.

Meanwhile, the receiver 550 receives information such as a ranging code and a MAC header transmitted from the terminal and transmits the information to the information reader 530.

Then, the information reading unit 530 reads the information (ranging code, MAC header, etc.) transmitted from the receiving unit 550 and transmits it to the terminal connection confirming unit 510, and the terminal connection confirming unit 510 transmits the information from the terminal. Check the transmitted information to determine whether the terminal is normally connected to the base station.

In the above, the terminal connection status checking apparatus according to the present invention has been briefly described with reference to FIG. 5, and details such as a specific operation, a message structure, and a message flow related to the terminal connection status checking apparatus of the present invention are described below. Reference may be made to the contents of the method for checking the terminal connection status according to the present invention.

6 is a flowchart illustrating a method of checking a terminal connection state according to an embodiment of the present invention.

After the terminal registers with the base station through an initial network entry process, it checks whether the terminal is normally connected to the base station through periodic ranging. To this end, the base station allocates a periodic ranging region to an uplink frame, and transmits a UL-MAP message with an uplink interval usage code (UIUC) = 12 including information on the uplink frame (step S610). In this case, the base station broadcasts by setting a connection ID (CID) as a broadcast CID so that all terminals can use the periodic ranging area.

For reference, Table 1 below illustrates the format of the UL-MAP message used in the present invention. Referring to Table 1, it can be seen that the UL-MAP message includes at least one UL-MAP IE indicating each region of the uplink frame.

[Table 1] UL-MAP message format

And, Table 2 below illustrates the format of the UL-MAP IE used in the present invention. Referring to Table 2, in case of UL-MAP IE for the periodic ranging region included in the UL-MAP message transmitted in step S610 of the present embodiment, 'CID = Broadcast CID (eg, 0xFFFF) and UIUC = 12' is set. Can be.

[Table 2] UL-MAP IE format

Then, the terminal receiving the UL-MAP message with 'CID = Broadcast CID, UIUC = 12' transmits a randomly selected periodic ranging code to a periodic ranging region corresponding to the UL-MAP IE, and the base station receives the random ranging code. Periodic ranging is performed by transmitting ranging slot information (OFDMA symbol number, subchannel number, etc.) in which the ranging code transmitted by the terminal is located and a RNG-RSP (Ranging Response) message including the ranging code to the terminal. Is performed.

On the other hand, the base station searches whether there are terminals that need to check the connection state among the terminals (management target terminals) registered to them. This may be determined whether the management target terminal corresponds to a preset access check condition. The preset condition is that if there is no bandwidth request for a predetermined time from the terminal, there is no traffic associated with the terminal. For example, the CQI transmission power information (Tx Power codeword) is not transmitted from the terminal for a predetermined time. If there is a terminal meeting the above condition, the terminal access check is started to check whether the corresponding terminal is normally connected to the base station (step S620).

First, the base station generates an MAC management message including the identification information (eg, Basic CID) of the corresponding terminal and transmits the MAC management message to the terminal, thereby inducing the inviting ranging to the corresponding terminal (step S630). For example, the base station transmits a UL-MAP message to the terminal by setting the CID as the basic CID of the terminal in the UL-MAP IE having UIUC = 12 for the periodic ranging region.

Then, when receiving the UL-MAP message, the UE performs the periodic ranging by transmitting the ranging code to the encoded periodic ranging region when the CID of the UL-MAP IE having UIUC = 12 matches its basic CID ( Step S640).

Meanwhile, when the ranging code is transmitted to the encoded periodic ranging region, the base station includes ranging slot information (OFDMA symbol number, subchannel number, etc.) in which the ranging code transmitted by the terminal is located and the ranging code is included. A RNG-RSP (Ranging Response) message is transmitted to the terminal (step S650). At this time, the base station adds the terminal access confirmation information to the RNG-RSP message and transmits to the terminal in order to confirm whether the terminal transmitting the periodic ranging code is the terminal to confirm the access. In addition, the base station transmits a UL-MAP message including the CDMA Allocation IE with UIUC = 14 to the terminal so that the terminal can perform an operation corresponding to the terminal access confirmation information (step S650). In this case, it is preferable that the RNG-RSP message and the UL_MAP message are transmitted together through the same frame, and can also be transmitted through different frames.

Hereinafter, the above-described step S650 will be described in detail with reference to FIGS. 7 and Tables 3 to 5.

Table 3 below illustrates the format of the RNG-RSP message used in the present invention. In this regard, FIG. 7 illustrates the structure of the RNG-RSP message according to the present invention.

[Table 3] RNG-RSP message format

Referring to Table 3 and FIG. 7, the RNG-RSP message according to the present invention includes a MAC Management Message Type and a TLV Encoded information area. UE access confirmation information is included in the TLV encoded information area in a TLV format. For reference, in FIG. 7, the terminal access confirmation information is indicated as 'Keep Alive', and Table 4 below illustrates a format of a Keep Alive TLV.

 [Table 4] Keep Alive TLV format

As such, the base station may designate a specific operation to be performed by the terminal through the Keep Alive TLV included in the RNG-RSP message. In addition, the base station transmits the UL-MAP including the CDMA Allocation IE having UIUC = 14 to the UE so as to perform the corresponding operation included in the RNG-RSP message. Table 5 below illustrates the CDMA Allocation IE format.

[Table 5] CDMA Allocation IE format

Referring back to FIG. 6, the terminal receives the RNG-RSP message and the UL-MAP message transmitted from the base station, analyzes the ranging code attributes of the RNG-RSP message, and compares the ranging slot information with the ranging slot information. Check the ranging code to see if the RNG-RSP message corresponds to it. If the RNG-RSP message corresponds to the UE, the UE checks a value included in the UE access confirmation information (Keep Alive) of the RNG-RSP message and performs a specific operation corresponding thereto.

For example, referring to Table 4, when the value of the Keep Alive TLV is '1', the terminal transmits a bandwidth request header filled with a bandwidth request field to 0 to the base station, and when the value is '2', the bandwidth request field. Transmits the bandwidth request filled with 0 and the uplink transmission power report header (BR and UL Tx power header) to the base station (step S660). In case of '0', no special operation is performed.

For reference, FIGS. 8 and 9 illustrate the format of the bandwidth request header and the format of the bandwidth request and uplink transmission power report header (BR and UL Tx power header), respectively. In the figure, 0 (Bandwidth Request) is filled with a transmission power value with UL Tx, and a 16-bit CID (CID MSB + CID LSB) is filled with a basic CID of the corresponding terminal.

Meanwhile, the base station receives the bandwidth request header or the bandwidth request and the uplink transmission power report header from the terminal, reads the corresponding CID, and determines whether the terminal indicated by the base station has performed the requested operation to check the access state of the terminal. (Step S670).

By this series of steps, the process of the base station confirms the access state to a specific terminal is terminated, the base station again provides a ranging opportunity to all terminals by transmitting a broadcast (broadcast) CID UL-MAP ( Step S680).

Although the present invention has been described in detail with reference to preferred embodiments, it will be apparent to those skilled in the art that the present invention may be embodied in other specific various forms without changing the technical spirit or essential features of the present invention. One embodiment is to be understood in all respects as illustrative and not restrictive.

In addition, the scope of the present invention is specified by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts are included in the scope of the present invention. Should be interpreted as

1 is a flowchart of a method for checking a connection state of a terminal according to the prior art.

2 is a schematic diagram illustrating a connection state checking method of a terminal according to the prior art.

3 is a structural diagram of a RNG-RSP message according to the prior art.

4 is a schematic diagram illustrating a connection state checking method of a terminal according to the present invention.

5 is a configuration diagram of an apparatus for checking a connection state of a terminal according to the present invention.

6 is a flowchart illustrating a method of checking a connection state of a terminal according to the present invention.

7 is a structural diagram of an RNG-RSP message according to the present invention.

8 illustrates a format of a bandwidth request header according to the present invention.

9 illustrates the format of a bandwidth request and uplink transmit power report header in accordance with the present invention.

Claims (23)

A terminal connection confirmation unit searching for a terminal corresponding to a preset terminal connection confirmation condition; A message generator for generating a message including terminal identification information and terminal access confirmation information on the searched terminal; A transmitter for transmitting the generated message; And A receiving unit for receiving information corresponding to the transmitted message from the terminal, The terminal connection confirming unit checks whether the terminal is connected by determining whether the terminal corresponding to the terminal identification information performs an operation corresponding to the terminal access identification information from the received information. Device for checking the terminal connection status in the. The method of claim 1, And the terminal access confirmation information is operation information that should be performed by a terminal corresponding to the terminal identification information. The method of claim 1, And the terminal access confirming unit determines that the terminal is connected when the terminal corresponding to the terminal identification information performs an operation corresponding to the terminal access confirming information. The method of claim 1, The operation corresponding to the terminal access confirmation information may be any one of i) transmitting a bandwidth request header to a base station, and ii) transmitting a bandwidth request and an uplink transmission power report header to a base station. Device for checking the terminal connection state in a wireless communication system. The method according to any one of claims 1 to 4, And the message including the terminal identification information and the terminal access confirmation information is a RNG-RSP (Ranging Response) message in response to a ranging request. The method of claim 5, And the terminal access confirmation information is added to a TLV (Type Length Value) encoded region of the RNG-RSP message in a TLV format. The method according to any one of claims 1 to 4, The message generator generates an UL-MAP (Uplink MAP) message for allocating a predetermined area of an uplink frame so that the terminal can perform an operation corresponding to the terminal access confirmation information, and the transmitter generates the generated UL-MAP. Device for checking the terminal connection status in a wireless communication system, characterized in that for transmitting a message. The method of claim 7, wherein And a message including the terminal access confirmation information and the UL-MAP (Uplink MAP) message are transmitted through the same frame. The method according to any one of claims 1 to 4, The preset terminal access confirmation condition is i) when there is no bandwidth request for a predetermined time, ii) when there is no traffic for a certain time, iii) when there is no CQI (Channel Quality Indicator) transmission power information for a certain time. Device for checking the terminal connection state in a wireless communication system, characterized in that it comprises at least one of. The method according to any one of claims 1 to 4, And the terminal identification information is a basic CID (Basic Connection Identifier) of the terminal. Searching for a terminal corresponding to a preset terminal access check condition; Transmitting a UL-MAP (UL-MAP) message including terminal identification information and an Invited Ranging Region information for the searched terminal; Receiving a ranging code through the encoded ranging region; Transmitting a ranging response message (RNG-RSP) message including the ranging code and the terminal access confirmation information; And And receiving information corresponding to the terminal access confirmation information to confirm whether the searched terminal is connected. The method of claim 11, And the terminal access confirmation information is operation information that should be performed by a terminal corresponding to the terminal identification information. The method of claim 11, The checking of whether the searched terminal is connected may include determining that the terminal is connected when the terminal corresponding to the terminal identification information performs an operation corresponding to the terminal access identification information. How to check the terminal connection status. 14. The method according to any one of claims 11 to 13, The preset terminal access confirmation condition is i) when there is no bandwidth request for a predetermined time, ii) when there is no traffic for a certain time, iii) when there is no CQI (Channel Quality Indicator) transmission power information for a certain time. Method of checking the terminal connection state in a wireless communication system comprising at least one of. 14. The method according to any one of claims 11 to 13, The transmitting of the RNG-RSP message includes transmitting a UL-MAP (Uplink MAP) message for allocating a predetermined region of an uplink frame so that the terminal can perform an operation corresponding to the terminal access confirmation information. Method for checking the terminal connection status in a wireless communication system, characterized in that. 14. The method according to any one of claims 11 to 13, And the RNG-RSP message and the UL-MAP (Uplink MAP) message are transmitted through the same frame. 14. The method according to any one of claims 11 to 13, The UE access confirmation information is added to the TLV (Type Length Value) encoded region of the RNG-RSP message in a TLV format. 14. The method according to any one of claims 11 to 13, And information corresponding to the terminal access confirmation information is a bandwidth request header or a bandwidth request and uplink transmission power report header. 14. The method according to any one of claims 11 to 13, And the terminal identification information is a basic connection identifier (CID) of the terminal. Transmitting a message including terminal identification information and terminal access confirmation information for the terminal for confirming access; And And receiving information in response to the message from the terminal corresponding to the terminal identification information, and determining whether to access the terminal by determining whether to perform an operation corresponding to the terminal access confirmation information. How to check the terminal connection status in. The method of claim 20, And the information responsive to the message is a bandwidth request header or a bandwidth request and uplink transmission power report header. The method of claim 20 or 21, And the terminal identification information is a basic connection identifier (CID) of the terminal. The method of claim 20 or 21, The message including the terminal identification information and the terminal access confirmation information is a RNG-RSP (Ranging Response) message in response to the ranging request, The UE access confirmation information is added to the TLV (Type Length Value) encoded region of the RNG-RSP message in a TLV format.

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