KR20160137054A - Managing method of frequency of base station - Google Patents

Managing method of frequency of base station Download PDF

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Publication number
KR20160137054A
KR20160137054A KR1020150071579A KR20150071579A KR20160137054A KR 20160137054 A KR20160137054 A KR 20160137054A KR 1020150071579 A KR1020150071579 A KR 1020150071579A KR 20150071579 A KR20150071579 A KR 20150071579A KR 20160137054 A KR20160137054 A KR 20160137054A
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KR
South Korea
Prior art keywords
base station
frequency
random access
message
terminal
Prior art date
Application number
KR1020150071579A
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Korean (ko)
Inventor
임순용
Original Assignee
한국전자통신연구원
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Priority to KR1020150071579A priority Critical patent/KR20160137054A/en
Publication of KR20160137054A publication Critical patent/KR20160137054A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method for managing a frequency of a base station according to an exemplary embodiment of the present invention includes receiving a frequency change request message from a server, receiving a frequency change request message from a server, performing a random access operation on at least one terminal located within the cell coverage, Receiving a random access preamble from a portion of the at least one terminal, changing a frequency of use, forwarding a cell recovery message to the at least one terminal, And forwarding the message.

Description

TECHNICAL FIELD [0001] The present invention relates to a frequency management method for a base station,

The present invention relates to a frequency management method of a base station.

In the LTE (Long Term Evolution) based mobile communication system, the frequency of use of the cell is allocated from the OAM (Operation Administration Maintenance) center of the mobile communication provider. Frequency interference due to overlapping coverage with neighboring cells can solve a lot of problems in the cell placement phase, and the interference that the terminal experiences in the overlapping area can be solved by intercell interference management.

In the 5G communication network, which is a new generation communication network, a mobile cell arrangement is expected. In other words, the cell experiences a situation that moves unlike the existing one. In such a case, overlapping of coverage between mobile cells may occur extensively in some cases. Some cells in mobile cells where coverage is overlapped should change the frequency of use if they do not control the movement of the mobile cell.

However, changing the used frequency causes a cell re-selection procedure for the terminals in the cell. Therefore, if a plurality of terminals perform cell reselection operation at a time, there is a problem that the data flow of the UE is disconnected due to resource congestion and QoS of traffic drops.

It is an object of the present invention to provide a frequency management method of a base station capable of efficiently changing a frequency.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

A method for managing a frequency of a base station according to an exemplary embodiment of the present invention includes receiving a frequency change request message from a server, receiving a frequency change request message from a server, performing a random access operation on at least one terminal located within the cell coverage, Receiving a random access preamble from a portion of the at least one terminal, changing a frequency of use, forwarding a cell recovery message to the at least one terminal, And forwarding the message.

In one embodiment, the cell suspend message may include suspend start time information, random access probability information, random access preamble generation information, and recovery start time information.

In one embodiment, the at least one terminal may operate in a suspend mode at a time corresponding to the suspend start time information.

In one embodiment, the at least one terminal may perform the random access operation based on the random access probability information.

In one embodiment, the random access preamble generation information may be a dedicated preamble index.

In one embodiment, the terminal may resume communication with the base station using the changed use frequency at a time corresponding to the recovery start time information.

In one embodiment, the cell suspended message may be transmitted via at least one of a paging message, a system information message, an RRC signal, and a PDCCH.

In one embodiment, the method may further comprise generating timing advance information of the at least one terminal based on the received random access preamble.

In one embodiment, the cell recovery message may include the timing advance information.

In one embodiment, the cell recovery message may be transmitted via at least one of a paging message, a system information message, an RRC signal, and a PDCCH.

According to the base station frequency management method according to an embodiment of the present invention, the frequency change process of the base station can be simplified and speeded up.

According to the frequency management method of the base station according to the embodiment of the present invention, the traffic disconnection of the terminal in the cell coverage can be kept short and the traffic QoS can be maintained.

1 shows a frequency management system of a base station according to an embodiment of the present invention.
2 illustrates the operation of a frequency management system of a base station according to an embodiment of the present invention.
3 is a flowchart illustrating a frequency management method of a base station according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

1 shows a frequency management system of a base station according to an embodiment of the present invention.

Referring to FIG. 1, a frequency management system of a base station according to an embodiment of the present invention includes a first base station 100, a second base station 200, at least one terminal 300-1, 300-2, , And a server 400. [

The first base station 100 and the second base station 200 may be small cells. Each of the first base station 100 and the second base station 200 may have cell coverage. For example, the first base station 100 and the second base station 200 may have the same frequency of use.

The first base station 100 may communicate with at least one terminal 300-1, 300-2, 300-3 located within the cell coverage. At least one of the terminals 300-1, 300-2, and 300-3 can randomly access the first base station 100. Since the first base station 100 is a small cell, at least one terminal 300-1, 300-2, 300-3 may have substantially the same timing advance.

The first base station 100 and the second base station 200 may be moving cells. Therefore, as the first base station 100 and / or the second base station 200 move, the cell coverage may overlap and the use frequency may need to be changed.

The server 400 may manage the first base station 100 and the second base station 200. For example, the server 400 can manage the location and frequency of use of the first base station 100 and the second base station 200. For example, the server 400 may be a management server of the OAM center.

The server 400 may request the first base station 100 or the second base station 200 to change the used frequency when the first base station 100 and the second base station 200 are adjacent to each other. Hereinafter, it is assumed that the server 400 requests the first base station 100 to change the used frequency, and will be described in more detail with reference to FIG.

2 illustrates the operation of a frequency management system of a base station according to an embodiment of the present invention.

2 illustrates a case where the server 400 performs frequency management operations of the first base station 100 and the second base station 200. However, the present invention is not limited to this, It can also be applied to management.

2, when the first base station 100 and the second base station 200 are adjacent to each other, the server 400 may transmit a frequency change request message to the first base station 100 (S10).

The first base station 100 may transmit a cell suspend message to at least one of the terminals 300-1, 300-2 and 300-3 in response to the frequency change request message from the server 400 ). For example, the cell suspend message may include suspend start time information Ts, random access probability information, random access preamble generation information, and recovery start time information Tr.

The first base station 100 transmits a cell suspended message through at least one of a paging message, a system information block message, an RRC signal, and a PDCCH to at least one terminal 300-1,300 -2, 300-3).

At least one of the terminals 300-1, 300-2, and 300-3 may operate in the suspend mode at a time corresponding to the suspend start time information Ts. Since the suspend mode is well known in the art, a detailed description thereof will be omitted.

At least one of the terminals 300-1, 300-2, and 300-3 may perform a random access operation based on the random access probability information transmitted from the first base station 100. [ The random access probability information may be set by the first base station 100. [ The random access probability information may include a probability value ex.p%. Therefore, only a part of at least one of the terminals 300-1, 300-2 and 300-3 can perform a random access operation, and only a proper number of terminals can perform a random access operation, thereby efficiently using PRACH resources .

For example, if the random access probability information includes a probability value (e.g., p = 0%), then at least one of the terminals 300-1, 300-2, and 300-3 may not perform the random access operation . That is, the first base station 100 may set the probability value p of random access probability information to 0 when it is determined that adjustment of timing advance is not necessary. In this case, at least one terminal 300-1 , 300-2, and 300-3 can maintain the existing timing advance.

At least one terminal (for example, 300-1 and 300-2) that performs a random access operation according to the random access probability information may transmit a random access preamble to the first base station 100 S30). The random access preamble may be generated based on the random access preamble generation information included in the cell suspended message. For example, the random access preamble generation information may include a dedicated preamble index.

The first base station 100 may transmit a cell recovery message to at least one of the terminals 300-1, 300-2, and 300-3 (S40). The cell recovery message may include timing advance information of at least one of the terminals 300-1, 300-2, and 300-3. The first base station 100 transmits a cell suspended message through at least one of a paging message, a system information block message, an RRC signal, and a PDCCH to at least one terminal 300-1,300 -2, 300-3).

At least one of the terminals 300-1, 300-2 and 300-3 can resume communication with the first base station 100 at a time corresponding to the recovery start time information Tr using the changed used frequency .

When the frequency change process is completed, the first base station 100 may transmit a frequency change complete message to the server 400 (S50).

3 is a flowchart illustrating a frequency management method of a base station according to an embodiment of the present invention.

Referring to FIG. 3, a frequency management operation around the first base station 100 will be described. That is, a method of managing a frequency of a base station according to an exemplary embodiment of the present invention includes receiving a frequency change request message from a server (S110), performing at least one (S130) of receiving a random access preamble from a part of at least one terminal (S130), changing a used frequency (S140), transmitting a cell recovery message to at least one terminal (S150), and transmitting a frequency change completion message to the server (S160).

Hereinafter, steps S110 to S160 described above will be described in more detail.

The first base station 100 may receive a frequency change request message from the server 400 (S110). For example, if the first base station 100 moves and approaches the second base station 200, the first base station 100 may receive the frequency change request message from the server 400. [

The first base station 100 may transmit a cell suspend message to at least one of the terminals 300-1, 300-2 and 300-3 in response to the frequency change request message from the server 400 ). For example, the cell suspend message may include suspend start time information Ts, random access probability information, random access preamble generation information, and recovery start time information Tr. The first base station 100 transmits a cell suspended message through at least one of a paging message, a system information block message, an RRC signal, and a PDCCH to at least one terminal 300-1,300 -2, 300-3). The first base station 100 can control only a part of at least one of the terminals 300-1, 300-2, and 300-3 to perform the random access operation using the random access probability information.

At least one of the terminals 300-1, 300-2, and 300-3 may operate in the suspend mode at a time corresponding to the suspend start time information Ts. That is, the synchronization of the suspend time points of the first base station 100 and the at least one of the terminals 300-1 300-2 and 300-3 can be synchronized through the suspend start time information Ts. Since the suspend mode of the terminal is well known in the art to which the present invention belongs, a detailed description thereof will be omitted.

At least one of the terminals 300-1, 300-2, and 300-3 may perform a random access operation based on the random access probability information transmitted from the first base station 100. [ The random access probability information may be set by the first base station 100. [ The random access probability information may include a probability value ex.p%. Therefore, only a part of at least one of the terminals 300-1, 300-2 and 300-3 can perform a random access operation, and only a proper number of terminals can perform a random access operation, thereby efficiently using PRACH resources .

For example, the first base station 100 may set the probability value p of the random access probability information to zero when it is determined that adjustment of timing advance is not necessary. In this case, at least one terminal 300 -1, 300-2, and 300-3 can maintain the existing timing advance.

The first base station 100 may receive a random access preamble from at least one terminal (e.g., 300-1, 300-2) performing a random access operation according to the random access probability information (S130). The random access preamble may be generated based on the random access preamble generation information included in the cell suspended message. For example, the random access preamble generation information may include a dedicated preamble index.

The first base station 100 may change the frequency of use (S140). For example, the first base station 100 may change the frequency of use to a frequency different from the frequency of use of the second base station 200. Also, the first base station 100 may transmit at least one terminal 300-1, 300-2, 300-3, and 300-3 based on the random access preamble received from at least one terminal (e.g., 300-1, 300-2) 3 can be generated.

The first base station 100 may transmit a cell recovery message to at least one of the terminals 300-1, 300-2, and 300-3 (S150). The cell recovery message may include timing advance information of at least one of the terminals 300-1, 300-2, and 300-3. The first base station 100 transmits a cell suspended message through at least one of a paging message, a system information block message, an RRC signal, and a PDCCH to at least one terminal 300-1,300 -2, 300-3).

At least one of the terminals 300-1, 300-2 and 300-3 can resume communication with the first base station 100 at a time corresponding to the recovery start time information Tr using the changed used frequency . That is, the synchronization of the resume point of the first base station 100 and the at least one of the terminals 300-1 300-2 and 300-3 can be synchronized through the recovery start time information Tr.

When the frequency change process is completed, the first base station 100 may transmit a frequency change complete message to the server 400 (S160).

As described above, according to the base station frequency management method according to the embodiment of the present invention, only some terminals in the cell coverage perform random access operation, thereby simplifying and speeding up the random access procedure according to the use frequency change. In addition, the frequency management method of a base station according to an embodiment of the present invention is a method of managing resources that can be generated by performing random access operation for cell re-selection at a time by all terminals in a cell coverage Congestion of traffic, and reduction of traffic QoS can be prevented.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: first base station
200: Second base station
300-1, 300-2, 300-3: terminal
400: Server

Claims (1)

Receiving a frequency change request message from a server;
Forwarding a cell suspended message to the at least one terminal such that at least one of the at least one terminal located within the cell coverage performs a random access operation;
Receiving a random access preamble from a portion of the at least one terminal;
Changing a use frequency;
Forwarding a cell recovery message to the at least one terminal; And
And transmitting a frequency change complete message to the server.
KR1020150071579A 2015-05-22 2015-05-22 Managing method of frequency of base station KR20160137054A (en)

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KR1020150071579A KR20160137054A (en) 2015-05-22 2015-05-22 Managing method of frequency of base station

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Application Number Priority Date Filing Date Title
KR1020150071579A KR20160137054A (en) 2015-05-22 2015-05-22 Managing method of frequency of base station

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