KR101401966B1 - Apparatus and method for updating the idle channel and idle channel lists - Google Patents

Abstract

A method of updating an idle channel and an idle channel list according to the present invention includes receiving a first idle channel list and a second idle channel list including idle channel information, Assigning a priority between the first idle channel list and the second idle channel list according to a reference value; and assigning a priority between the first idle channel list and the second idle channel list in accordance with the given priority, And adjusting a second idle channel of the list.

IEEE 802.22, FSL

Description

[0001] Apparatus and method for updating idle channel and idle channel lists [

FIG. 1 is a schematic diagram showing a communication channel between a base station and a terminal, and a region where communication areas are overlapped with other base stations.

2 is a block diagram of an apparatus for updating an idle channel and an idle channel list according to an embodiment of the present invention.

3 is a diagram illustrating a process of a base station collecting an idle channel and an idle channel list according to an embodiment of the present invention.

4 is a flowchart illustrating a method of updating an idle channel list including idle channel information according to an embodiment of the present invention.

FIG. 5 is a detailed flowchart of step S450 of adjusting an idle channel between the prioritized idle channel lists of FIG.

FIG. 6 is a diagram illustrating a list of idle channels shared by the first idle channel list including the idle channel information of FIG. 4 and the second idle channel list including the idle channel information (S410).

FIG. 7 is a graph showing the channel priority according to the network initialization time in the reference value setting step (S430) for giving priority to the idle channel list in FIG.

FIG. 8 is a diagram illustrating a method of adjusting an idle channel in step S450 of adjusting an idle channel between the idle channel lists of FIG. 4; FIG.

DESCRIPTION OF THE EMBODIMENTS

200: first base station

210: Reference value setting module

220: Transmitting / receiving module

230: control module

240:

250: second base station

260:

The present invention relates to an apparatus and method for updating an idle channel and an idle channel list, and more particularly, to an apparatus and method for updating an idle channel and an idle channel list by sharing idle channel information between neighboring base stations, And to an apparatus and method for updating a list of idle channels and idle channels.

The IEEE 802.22 specification defines a message exchange scheme for acquiring neighbor idle channel information, but there is no definition of a method for sharing idle channel information between base stations to prevent the use of overlapping communication channels.

FIG. 1 is a schematic diagram showing a communication channel between a base station and a terminal, and a region where communication areas are overlapped with other base stations. Referring to FIG. 1, in a CR (Cognitive Radio) system, a UE recognizes an idle channel list and transmits the idle channel list to a base station, and the base station transmits and receives the list of recognized idle channels to other base stations. Therefore, the base station can know the idle channel list shared among the base stations. However, as shown in FIG. 1, the idle channel of the idle channel list may be the same in the neighboring communication area. When the communication channel should be changed by avoiding the user first, the base station moves to the overlapped communication channel, There is a problem using the channel.

Therefore, when the base station changes the communication channel by avoiding the user first, it shares the idle channel information between the base stations and updates the idle channel list to change the channel to the same channel to prevent collision of the used communication channel. A method is needed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method and apparatus for sharing idle channel lists among base stations, And an apparatus and method for preventing collision of channels.

Another aspect of the present invention is to provide a system and method for updating an idle channel list of a base station having a lower priority according to a predetermined priority according to a predetermined reference value by sharing an idle channel list between base stations.

According to another aspect of the present invention, there is provided a method of updating an idle channel and an idle channel list, the method comprising: receiving a first idle channel list including idle channel information and a second idle channel list; Assigning a priority between the first idle channel list and the second idle channel list and assigning a priority to the first idle channel list and the second idle channel list in accordance with the given priority, And adjusting the channel.

According to another aspect of the present invention, there is provided an apparatus for updating an idle channel and an idle channel list, the apparatus comprising: a transmission / reception module for receiving a first idle channel list including idle channel information and a second idle channel list; And a reference value setting module for assigning a priority between the idle channel list and the second idle channel list and adjusting the first idle channel and the second idle channel according to the priority.

The details of other embodiments are included in the detailed description and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an apparatus for updating an idle channel and an idle channel list according to an embodiment of the present invention (components not related to the present invention with respect to a cognitive system are not shown).

Referring to FIG. 2, the first base station 200 includes a reference value setting module 210, a transmission / reception module 220, and a control module 230.

The transmission / reception module 220 receives the first idle channel list including the idle channel information collected from the first terminal 240 and transmits the first idle channel list to the storage unit in the control module 230. The second idle channel list including the idle channel information collected from the second terminal 260 is transmitted to the second base station 250. The transmission / reception module 220 receives the second idle channel list from the second base station 250 and transmits the second idle channel list to the storage unit in the control module 230. In response to a request from the control module 230, the first idle channel list having the non-overlapped communication channels and the second idle channel list having the priority assigned thereto are transmitted to the first terminal 240 or the second base station 250 do. The process of collecting idle channel information and transmitting it to the first base station 200 will be described later with reference to FIG. Although the above description has been given only to the first base station 200, the first terminal 240, the second base station 250 and the second terminal 260, the terminal and the base station are not limited thereto, have.

The control module 230 including the storage unit plays the following role (the storage unit is not shown in the figure).

First, the first terminal 240 requests a search for a first idle channel list including idle channel information. Second, the second base station 250 requests sharing of the second idle channel list including the idle channel information. Third, a priority is set according to a reference value between the first idle channel list and the second idle channel list, and the reference value setting module 210 is controlled so that there is no overlapped communication channel between the idle channels. (220) to transmit a first idle channel list having an idle channel with no nested communication channel and a second idle channel list to the first terminal (240) or the second base station (250).

The reference value setting module 210 recognizes the first idle channel list and the second idle channel list from the storage unit in the control module 230 according to an instruction from the control module 230. [ Assigns a priority to the first idle channel list and the second idle channel list according to a predetermined reference value and prevents overlapping of the first idle channel of the first idle channel list and the second idle channel of the second idle channel list Adjust the list of idle channels. The first idle channel list and the second idle channel list having no overlapped communication channel are transmitted to the first terminal 240 and the second base station 250 through the transmitter module 220. [ The predetermined reference value includes the network initialization time, the power of the base station, the number of terminals belonging to the base station, the type of work done by the base station, and the like.

The first terminal 240 and the second terminal 260 include wireless devices such as cordless phones and MP3 players.

3 is a diagram illustrating a process of a base station collecting an idle channel and an idle channel list according to an embodiment of the present invention.

Referring to FIG. 3, the first BS 200 transmits a BLK (Bulk Measurement) -REQ (Request) indicating a channel to be searched and a UE to the first MS 240 (S310). The first terminal 240 having received the BLM-REQ transmits a BLM-RSP (Response) to the first base station 200 to confirm that it has received the BLM-REQ (S320). The first terminal 240 transmitting the BLM-RSP transmits a BLM-REP (Report) including the first idle channel list including the idle channel information as a search result to the base station at step S330. Then, the first base station 200 receiving the BLM-REP transmits a BLM-ACK (acknowledgment) to the first terminal 200 to confirm that the BLM-REP has been received (S340). As described above, the second base station 250 can receive the second idle channel list from the second terminal 260.

As described above, the first base station 200 can receive the second idle channel list including the idle channel information from the second base station 250.

Accordingly, the first base station 200 and the second base station 250 may share the second idle channel list with the first idle channel list.

4 is a flowchart illustrating a method of updating an idle channel list including idle channel information according to an embodiment of the present invention.

Referring to FIG. 4, synchronization between the first base station 200 and the second base station 250 is performed (S410). The first base station 200 transmits an FSL (Frame Slide) -REQ (Request) to the second base station 250 in order to synchronize the base stations. The second base station 250 having received the FSL-REQ transmits the FSL-RSP (Response) to the first base station 200 and synchronizes them. The above-described base station has been described only for the first base station 200 and the second base station 250 for convenience of explanation, but may include other base stations.

The idle channel list including idle channel information is shared (S420). 3, the first base station 200 requests idle channel information from the first terminal 240, and the first terminal 240 transmits the first idle channel information corresponding to the request to the first base station 240, (200). The first base station 200 creates a first idle channel list using the received idle channel information. As the first base station 200 generates the idle channel list, the second base station 250 receives the second idle channel information from the second terminal 260 and creates a second idle channel list. Since the first base station 200 receives the second idle channel list from the second base station 250, it can share the second idle channel list.

A reference value for giving priority to the idle channel list is set and the reference value is shared (S430).

The reference value setting module 210 may set a reference value and may transmit the reference value between the base stations through the transmission / reception module 220. Accordingly, the base station can share the reference value, and priority can be given to the idle channel list according to the reference value. The reference value may be the network initialization time, the power of the base station, the number of terminals belonging to the base station, the type of work performed by the base station, and the like.

Accordingly, the first base station 200 and the second base station 250 share the idle channel list and the reference value for giving priority.

Priority is given to the idle channel list according to the reference value (S440). The reference value setting module 210 that sets the reference value determines the priority between the first idle channel list of the first base station 200 and the second idle channel of the second base station 250 according to the reference value. When the first idle channel list is prioritized, the reference value setting module 210 compares the second idle channel included in the second idle channel list with the first idle channel included in the first idle channel list.

After the reference value is set, the idle channel between the prioritized idle channel lists is adjusted (S450). As described above, the reference value setting module 210 compares the first idle channel with the second idle channel. Since there is a priority in the first idle channel list, if there is a second idle channel that is the same as the first idle channel, the second idle channel is deleted, the second idle channel list is updated with the new channel, Compare with the channel. A specific method will be described later with reference to Fig.

The first base station 200 and the second base station 250 are updated with the idle channel list adjusted for the idle channel (S460). As described above, the first base station 200 and the second base station 250 share the idle channel list and the reference value to which the priority is given, so that the first base station 200 transmits the idle channel list and the second base station 250) and updates its idle channel list according to the priority. Like the first base station 200 described above, the second base station 250 compares its idle channel list with the idle channel list of the first base station 200 and updates its idle channel list according to the priority order . Through the above process, the first base station 200 and the second base station 250 have an idle channel list having different idle channel information. Accordingly, the first idle channel list and the second idle channel list between the first base station 200 and the second base station 250 have idle channel information that is not overlapped. Therefore, when the user first uses the communication channel used by the first base station 200, the first base station 200 uses a communication channel that is not overlapped with the second base station 250 to cause a communication failure or a communication delay Do not.

FIG. 5 is a detailed flowchart of step S450 of adjusting an idle channel between the prioritized idle channel lists of FIG.

5, when the reference value setting module 210 sets a priority in the first idle channel list according to the reference value, the reference value setting module 210 sets the first idle channel in the first idle channel list and the second idle channel in the second idle channel list, It is determined whether the second idle channel of the channel list is the same (S510). If the idle channel is the same, the reference value setting module 210 in the first base station deletes the second idle channel of the second idle channel list (S520). After deleting the second idle channel, the second base station 250 updates the second idle channel list including the new idle channel as described above (S530). The second base station 250 transmits the updated second idle channel list to the first base station 200. And compares the transmitted updated second idle channel with the first idle channel.

If the idle channel is not the same, the first base station 200 moves to step S460 of storing the first idle channel list and transmitting the second idle channel list to the second base station 250. [

FIG. 6 is a diagram illustrating a list of idle channels shared by the first idle channel list including the idle channel information of FIG. 4 and the second idle channel list including the idle channel information (S410).

Referring to FIG. 6, when a user uses a communication channel used by the first base station 200, the first base station 200 changes the communication channel in order of priority. Accordingly, the priority order indicates the order in which the first base station 200 changes the communication channel. The idle channel of the first base station 200 means a communication channel not used. Although only the first base station 200 has been described, the idle channel of the second base station is also the same.

FIG. 7 is a table showing the channel priority according to the network initialization time in the reference value setting step (S430) of giving priority to the idle channel list in FIG.

Referring to FIG. 7, the type of the base station means a base station such as the first base station 200, the network initialization time means an initialization time point of the base station, and indicates a channel priority according to the initialization time.

FIG. 8 is a diagram illustrating a method of adjusting an idle channel in step S450 of adjusting an idle channel between the idle channel lists of FIG. 4; FIG.

Referring to FIG. 8, as described above with reference to FIG. 6, an idle channel list 810 is given priority according to a reference value. The reference value setting module 210 determines the priority of the first idle channel list and the second idle channel list according to the reference value and then confirms whether the first idle channel and the second idle channel are the same communication channel. 820 compares the idle channel between the first idle channel and the second idle channel to determine whether they are the same. In the case of Priority 1, the first idle channel and the second idle channel are the same, and the reference value setting module 210 deletes the second idle channel. And updates the new idle channel transmitted from the second base station 250. [ 830 compares the updated second idle channel with the first idle channel. Repeat the above steps until there is no idle channel. Although the description has been given only to the first idle channel of the first base station 200 and the second idle channel of the second base station 250, it may further include another base station.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

According to the apparatus and method for updating the idle channel and the idle channel list of the present invention as described above, there is an advantage of preventing collision of communication channels between base stations when a base station changes a communication channel by avoiding a user first.

In addition, according to the present invention, there is an advantage that after the base station changes the communication channel by avoiding the user first, the base station can update the effective channel information and transmit it to another base station.

Claims (5)

Receiving a first idle channel list and a second idle channel list including idle channel information; Setting a reference value for assigning a priority among the idle channel lists; Assigning a priority between the first idle channel list and the second idle channel list according to the set reference value; And And adjusting a first idle channel of the first idle channel list and a second idle channel of the second idle channel list according to the given priority, The method according to claim 1, Wherein the adjusting comprises: Confirming whether the first idle channel and the second idle channel are the same channel; Deleting the second idle channel if the channels are the same; And And assigning a new idle channel to the second idle channel. 3. The method of claim 2, Further comprising confirming whether the first idle channel and the second idle channel to which the new idle channel is allocated are the same channel. A transmission / reception module for receiving a first idle channel list and a second idle channel list including idle channel information; And Sets a reference value for giving priority to an idle channel list, assigns a priority between the first idle channel list and the second idle channel list according to the set reference value, And a reference value setting module for adjusting a second idle channel. 5. The method of claim 4, Further comprising a control module for synchronizing a first base station providing the first idle channel list with a second base station providing the second idle channel list.

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