KR100930054B1 - Dynamic Distribution Method of Accepting Subscribers by FA of Base Station in Mobile Communication System - Google Patents

Abstract

In the mobile communication system according to the present invention, a method for dynamically distributing subscribers per FA of a base station is disclosed. The present invention relates to a method for distributing subscribers accommodated in a base station of a mobile communication system, the method comprising: a) periodically, a base station of a mobile communication system, the number of terminals in a terminal accommodated for each FA and the number of terminals in idle state; Grasping; b) the base station searching for a congestion FA having a relatively large number of busy terminals in preparation for the number of busy terminals accommodated in each FA; And c) a base station handoffs at least one or more terminals in an idle state accommodated in the congestion FA to another FA in a mobile communication system. to be. According to the present invention, the terminal in the call handoff only the Idle state of the terminals accommodated in many congested FA to a relatively more relaxed FA, leading to an even distribution of the total number of terminals accommodated in each FA of the base station .

Call volume, call volume distribution, channel allocation, channel allocation, FA.

Description

Method for dynamic balancing subscriber accepted by Frequency Allocation in mobile telecommunication system in base station in mobile communication system

The present invention is a channel distribution method for improving the operation efficiency of a base station in a mobile communication system, and more specifically, the subscribers are dynamically distributed evenly in consideration of the number of subscribers and the number of callers accommodated in the FA of the channel of the mobile communication base station. The present invention relates to a method for improving the operation efficiency of a base station in a mobile communication network.

The spread of low cost terminals, improved call quality, and various contents due to the development of mobile communication have exploded the users of mobile communication. As a result, mobile communication has become an indispensable life necessity in modern society.

As the number of mobile communication subscribers increases, the development of more stable and efficient mobile communication system is actively progressing. In particular, the method of more efficiently managing limited communication resources enables the operation of the mobile communication system to be maximized. For example, in the case of crowded offices in high-density urban areas, the number of mobile communication users explodes during the day, resulting in saturation of the call channel, but relatively low population density at night, resulting in fewer mobile users. . In this case, the increase in unconditional base stations to secure stable communication resources is not correct in terms of cell operation or facility investment. Rather, more efficient allocation and use of limited communication resources would be more effective in terms of system and equipment investment.

Development of a method for more efficiently managing limited communication resources in a mobile communication system is actively progressing, and the related art 1 (Application No.:10-1996-54115) relates to a method for controlling channel allocation in a mobile communication system. will be.

Prior art 1 classifies a subscriber into a plurality of classes of a higher level group that gives a higher priority to channel allocation and a lower level group having a lower priority than those, and correspondingly classifies a communication channel into a higher level group. Dividing into channels and channels of a lower level group, determining a subscriber's level if there is a call attempt, and assigning in the classification step if the subscriber is a higher level subscriber as a result of the determination of the level determination step. Searching for an empty channel in order from channels of the higher level group to lower levels of the channel, and performing a call connection; In the mobile communication controlling the step of performing a call connection by searching for an empty channel only for the channels of the lower level group A channel allocation control method.

However, in case of the prior art 1, a subscriber and a communication channel are classified into a plurality of levels in advance and assigned to a corresponding channel according to the subscriber's level, which may cause problems in the operation of the communication channel when the subscribers of the same level are crowded at the same time. .

1 shows a schematic configuration of a call distribution method using base station sector pooling of a mobile communication system of the prior art 2 (Application No.:10-2005-0044765).

In the related art 2, when the maximum capacity is reached at the base station 1 26, the base station 1 transmits a BTS_id / Sector / Fa (Frequency Alignment) message to the control station 22, the CCP which is the call processing processor of the control station (BSC) 22. To send. Then, the CCP of the control station 22 searches the database for the status of the traffic channels of all the base stations 1,2 (26, 26-1) and the radio resource usage.

The control station 22 searches the call processing database managed by the controller 22 and classifies subscribers located in the sector of the base station 26. The first classification is mobile communication terminal 1 having pilot strength information of only base station A of base station 1. (30) and the mobile terminal 2 (30-1) having the reference A and the neighbor B, and the second classification is the mobile station having the strongest pilot strength of the reference B of the base station 2 (26-1). Are mobile communication terminals 3 (30-2) having a neighbor A connected to the second pilot strength.

When the list of the above two classifications is generated, the mobile communication terminals included in the list are distributed to neighboring base stations or sectors for resource pooling of the base station sectors having reached the maximum capacity.

In step 2 of the present invention, step 1 of transmitting a distributed request message from the base station 1 to the control station when the number of mobile communication terminals connected in the corresponding sector of the base station 1 of the mobile communication system reaches the maximum capacity and the control. When the station receives the distributed request message from the base station 1, the station checks the state of the sectors of all the base stations connected to the control station and the mobile communication terminal connected to the base station 1 from the database to identify the mobile handset capable of handoff. Step 2 and step 3, the control station handoffs the handoffable mobile communication terminal connected to the base station 1 to the neighboring base station so that the base station 1 can secure a traffic channel and process a newly requested call. And handoff process from the control station to the base station 1 at the time of handoff. The call distribution method using the base station sector pooling of the mobile communication system comprising the step of controlling the call drop of the mobile communication terminal to prevent the call drop occurs.

However, in the case of the prior art 2, since the distributed processing is carried out after the capacity reaches the maximum, there may be a problem in handling the amount of the subscriber's call when there is a sudden increase in the call volume, and also the busy terminal When the handoff process is performed, the communication channel should be allocated at both base stations because it should be monitored to prevent call drop of the mobile station during the handoff process.

2 is a flowchart illustrating a method for changing an FA for a mobile communication terminal in a call of the related art 3 (Application No. 10-2005-0099038).

Conventional Invention 3 is a method for changing an FA for a mobile communication terminal in a call in a multi-FA mobile communication system, wherein a specific mobile communication terminal is busy using a pre-allocated FA, and a plurality of base stations are assigned to a corresponding sector. Analyzing a load of the FA and selecting a FA having the least load among the plurality of FAs (S12); A second step (S13) of determining whether the FA pre-allocated to the mobile communication terminal on the call matches the FA of the selected lowest load; As a result of the determination, the FA change method for the mobile communication terminal in the call including the third step (S14) of allocating the FA of the selected lowest load to the mobile communication terminal if it does not match.

In the conventional invention 3 as described above, the handoff process of the terminal being called may result in a situation in which the call is disconnected, which may cause a problem in the call quality. Will be increased.

The present invention solves a problem in which a problem such as a drop may occur when handing off a terminal in a call, and to prevent a drop, a channel is provided to a terminal in which two FAs are handed off during a handoff. Since it is necessary to allocate the radio resources of the base station is used twice and solve the problem that the load of the base station is increased.

In order to solve the above problems, the present invention provides a method for distributing subscribers accommodated in a base station of a mobile communication system. Determining the number of terminals in idle state; b) the base station searching for a congestion FA having a relatively large number of busy terminals in preparation for the number of busy terminals accommodated in each FA; And c) handing off, by the base station, at least one or more terminals in an idle state accommodated in the congestion FA to a spare FA in which the number of terminals accommodated is smaller than the number of terminals accommodated in the congestion FA. In this mobile communication system, a method for dynamically distributing subscribers per FA of a base station.

Preferably, in step c), the base station handoffs at least one or more terminals in an idle state accommodated in the congestion FA to a spare FA having a smaller number of terminals accommodated compared to the number of terminals accommodated in the congestion FA. Alternatively, the base station may handoff at least one or more terminals that are in an idle state accommodated in the congestion FA to a spare FA having a smaller number of busy terminals accommodated than the number of busy terminals accommodated in the congestion FA. have.

Furthermore, the step b) may include b-1) setting a reference value for the acceptance of the mobile terminal on the basis of the capacity of the FA of the base station; b-2) comparing the reference number and the number of busy terminals accommodated in each FA; And b-3) determining that the FA is a congested FA when the number of busy terminals accommodated in a specific FA exceeds a reference value.

In this case, the reference value in step b-1) may be an average of the number of busy terminals accommodated in each FA.

Preferably, the step c) may include: c-1) searching for an FA in which the number of terminals accommodated is smaller than the number of terminals accommodated in the congestion FA; c-2) searching for a terminal capable of handoff among terminals in an idle state in the congestion FA; And c-3) the base station handoffs at least a portion of the terminal capable of handoff to a spare FA in which the number of terminals accommodated is smaller than the number of terminals accommodated in the congestion FA.

In step c-3), the base station hands off at least a part of the terminal capable of handoff to an FA having a smaller number of terminals accommodated than the congestion FA, or the terminal can perform the handoff. At least a portion of may be handed off to a spare FA in which the number of busy terminals accommodated is smaller than the number of busy terminals accommodated in the congestion FA.

In step c-3, the base station may handoff the number of terminals set by the mobile communication system operator among the terminals capable of handoff to an FA having a smaller number of the accommodated terminals.

The number set by the operator of the mobile communication system may be half of the number of terminals capable of handoff.

Preferably, the step c-3) includes: c-3-1) handing a free FA to a predetermined number of terminals among the terminals capable of handoff by the base station through an overhead channel with a smaller number of the accommodated terminals. Giving a control command to turn off; And c-3-2) the terminal receiving the control command performing a handoff between the congestion FA and the spare FA.

According to the present invention, a terminal in a call hands off only a terminal in idle state among terminals accommodated in many congested FAs to a more relaxed FA, thereby inducing a uniform distribution of the total number of terminals accommodated in each FA of the base station.

In addition, since the terminal in the call hands off only the terminals in the idle state among the terminals accommodated in many congested FAs, the call quality is maintained without the occurrence of a drop, and the load on the base station is increased compared to the case in which the terminal is busy. small.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

First, referring to the mobile communication system, the configuration of the mobile communication system may be schematically illustrated as shown in FIG. 3.

As shown in FIG. 3, the mobile communication system includes terminals 110a to 110n, which are terminal devices that allow a mobile subscriber to communicate through a mobile communication network, and a base station (BTS) that performs communication in a wireless section with the terminal. : Base Transceiver Subsystem (120a ~ 120n), a control station (BSC: Base Station Controller) that controls a radio link and a wired link, and performs a handoff function for maintaining the continuity of a call while the subscriber is on the move ( 130a to 130n), a mobile switching center (MSC) 100 that configures a subscriber's call path and performs a connection with another communication network, and subscriber information is stored, and a home location register (HLR) that receives and exchanges signals with the exchange station. Home Location Register (140) and the like, and the base station (120a ~ 120n), the control station (130a ~ 130n) and the exchange through the terminal 100 to realize the call.

In general, the base station (BTS) 120 constituting the mobile communication system is located between the mobile communication terminal (110a ~ 110n) and the control station (BSC) (130a ~ 130n), to control the call to the subscriber's mobile communication terminal And provide the necessary data for the mobile communication terminal to recognize the base station, allocate a traffic channel for the call request and open the path according to the control of the control station (BSC). The controlling function and the data processing speed of the mobile communication terminal.

The base station (BTS) 120 that controls the wireless section connected to the network is controlled by the control station (BSC), and consists of three sectors (Sector) and multi (Frequency Alignment) (FA).

FIG. 4 illustrates an embodiment for explaining a basic concept of a method for dynamically distributing a subscriber to each FA of a base station in a mobile communication system according to the present invention.

As shown in FIG. 4, the base station (BTS) 120 includes a plurality of FAs 121, 122, 123..., And accommodates a plurality of terminals for each FA. For more convenient description, the terminal A shown in the open state in FIG. 4 refers to a busy terminal, and the terminal B shown in the closed state refers to a terminal in an idle state.

In the FA-1, two terminals in a call and two terminals in an idle state are accommodated, and in the FA-2, four terminals in a call and four terminals in an idle state are accommodated. The base station periodically grasps the number of terminals in communication with each other and the number of terminals in idle state, and when the terminals are busy in a specific FA in order to efficiently operate communication resources, The terminal accommodated in the congestion FA is handed off to a more relaxed FA to induce the number of callers to be distributed evenly for each FA.

In this case, a problem such as a drop may occur when handing off a busy terminal, and in order to prevent this, a radio resource of a base station is doubled because a channel is allocated to a terminal to which two FAs are handed off during handoff. And the load on the base station also increases.

However, in the present invention, the terminal in the call does not hand off, but hands off only the terminal in Idle state, so there is no problem such as a drop or call quality. It takes less.

In the embodiment of FIG. 4, the most congested FA is FA-2, which contains four terminals in a call and terminal 4 in idle state. In contrast to FA-2, which is a congested FA, FA-3 is a relatively relaxed FA. The FA-3 includes two terminals in a call and one terminal in an idle state.

In such a case, in order to equalize the number of terminals accommodated in the overall FA by handing off the UEs accommodated in the congested FA to more relaxed FAs, some of the terminals in the idle state accommodated in the congested FA FA-2 (122a) When the base station transmits a control command to the terminal in the corresponding idle state through the overhead channel to handoff to FA-3, which is a more relaxed FA, the UE performs handoff to FA-3, which is more relaxed FA ( 120-2) to induce an even distribution of the number of terminals accommodated in each FA, thereby enabling efficient operation of communication resources of the base station.

5 is a schematic overall flowchart of a dynamic distribution method for receiving subscribers by FA of a base station in a mobile communication system according to the present invention.

In the mobile communication system, the method for dynamically distributing subscribers of FA subscribers in each base station is described in detail in each step. The number of terminals in which the base station (BTS) 120 is in talks with respect to terminals accommodated in each FA periodically And determining the number of terminals in idle state (S100), and comparing the number of terminals in communication with each FA (S200) to accommodate the received terminals for each FA of the corresponding base station (BST) 120. The distribution of the number of is determined.

In addition, the congestion FA having a relatively large number of busy terminals is searched compared to other FAs (S300). When the congestion FA is found, some of the idle UEs accommodated in the congestion FA are handed off to a more relaxed FA than the congestion FA (S400), and the number of terminals accommodated in the congestion FA is distributed to each FA of the base station. Evenly distributed capacity.

Furthermore, more preferably, as shown in the flowchart shown in FIG. 6, the congestion FA may be determined by comparing the reference value and the number of the terminals in the FA, and the base station compares the number of the terminals in the FA. In the process of searching for a congested FA having a relatively large number of terminals in a call, the reference value for acceptance of the terminal in a call is set based on the capacity of each FA (S210), and the set reference value is stored in each FA. In contrast to the number of terminals in a call (S220), when the number of terminals in a call received in a specific FA is greater than the reference value, the specific FA is determined as a congestion FA (S310). Here, the reference value may be an average of the number of busy terminals accommodated in each FA or may be set in advance based on the terminal capacity of each FA by an operator of the mobile communication system.

In addition, referring to the flowcharts of FIGS. 7 and 8, a process of handing off a terminal accommodated in a congestion FA to a spare FA is described first. Referring to FIG. 7, when a specific FA is determined to be a congestion FA for each FA of a base station, the congestion FA In step S410a, a free FA having a relatively small number of terminals accommodated in the terminal is searched for, and a terminal capable of handoff is searched for among terminals in idle state accommodated in the congestion FA (S420). A predetermined number of terminals are handed off to the spare FA (S430), where the number of terminals to be handed off is handed off by the number of terminals previously set by the mobile communication system operator or the congestion FA. One half of the number of UEs in the idle state accommodated in the UE may be handed off.

Alternatively, as shown in FIG. 8, when a specific FA is determined to be a congestion FA for each FA of the base station, a search for a spare FA having a relatively small number of in-call terminals accommodated compared to the number of in-call terminals accommodated in the congestion FA (S410b) In addition, a handoff-enabled terminal is searched among the terminals in the idle state accommodated in the congestion FA (S420), and a predetermined number of terminals among the handoff-capable terminals are handoffed to the spare FA (S430), where the handoff is performed. The number of terminals to be handed off may be handed off as many terminals as previously set by the mobile communication system operator, or half of the number of terminals in idle state accommodated in the congestion FA.

That is, the spare FA may be an FA in which the number of terminals accommodated relative to the congestion FA is relatively small or an FA in which the number of busy terminals accommodated relative to the congestion FA is relatively small.

Further, in determining the spare FA, the spare FA may be determined by imposing a constant weight on each of the number of the received terminals and the number of the terminals on the call.

Referring to the process of handoff, first, if the base station issues a control command to handoff a certain number of terminals capable of handoff to the spare FA through an overhead channel, the terminal receiving the control command Handoff is performed from the congestion FA to the spare FA.

According to the present invention, a method for dynamically distributing subscribers per FA of a base station in a mobile communication system can be modified and applied in various forms within the scope of the technical idea of the present invention, and is not limited to the above embodiments. In addition, the embodiments and drawings are merely for the purpose of describing the contents of the invention in detail, and are not intended to limit the scope of the technical idea of the invention, the present invention described above is common knowledge in the technical field to which the present invention belongs As those skilled in the art can have various substitutions, modifications, and changes without departing from the spirit and scope of the present invention, it is not limited to the embodiments and the accompanying drawings. And should be judged to include equality.

1 shows a schematic configuration of a call distribution method using base station sector pooling of a mobile communication system according to the prior art 2 (Application No.:10-2005-0044765).

2 is a flowchart illustrating a FA change method for a mobile communication terminal in the prior art 3 (Application No. 10-2005-0099038).

3 shows a schematic configuration of a mobile communication system.

FIG. 4 illustrates an embodiment for explaining a basic concept of a dynamic distribution method for receiving subscribers by FA of a base station in a mobile communication system according to the present invention.

5 is a schematic overall flowchart of a dynamic distribution method for receiving subscribers by FA of a base station in a mobile communication system according to the present invention.

6 is a flowchart illustrating a process of determining a congestion FA in comparison to the number of busy terminals accommodated in each FA according to the present invention.

7 and 8 are flowcharts illustrating a process of handing off a terminal accommodated in a congestion FA to a spare FA according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: switching center (MSC), 110a ~ 110n: mobile communication terminal, 120a ~ 120n: base station (BTS),

130a ~ 130n: Control station (BSC), 100: Switching station (MSC), 140: Home location register (HLR),

S100-S430: Code for each step in the flowchart of the present invention.

Claims (11)

A method for distributing subscribers accommodated in a base station of a mobile communication system, a) periodically, by the base station of the mobile communication system, identifying the number of terminals in call and the number of terminals in idle state in the terminals accommodated for each FA; b) the base station searching for a congestion FA having a relatively large number of busy terminals in preparation for the number of busy terminals accommodated in each FA; And c) the base station handoffs at least one or more terminals in an idle state accommodated in the congestion FA to a spare FA having a smaller number of terminals accommodated in comparison to the number of terminals accommodated in the congestion FA. Dynamic distribution method of receiving subscribers for each FA of a base station in a mobile communication system. delete delete The method of claim 1, B), b-1) setting a reference value for the acceptance of the terminal in a call based on the capacity of the FA of the base station; b-2) comparing the reference number and the number of busy terminals accommodated in each FA; And b-3) if the number of busy terminals accommodated in a specific FA exceeds the reference value, determining the corresponding FA as a congested FA; . The method of claim 4, wherein In step b-1), the reference value is a dynamic distribution method of the subscribers per FA of the base station in the mobile communication system, characterized in that the average of the number of the busy terminal accommodated in each FA. The method of claim 1, C), c-1) searching for an FA having a smaller number of terminals accommodated than the number of terminals accommodated in the congestion FA; c-2) searching for a terminal capable of handoff among terminals in an idle state in the congestion FA; And c-3) the base station handing off at least a part of the terminal capable of the handoff to a FA with a smaller number of terminals accommodated compared to the congestion FA; Dynamic distribution of subscribers. delete delete The method of claim 6, In the step c-3), the base station hands off the number of terminals set by the mobile communication system operator among the terminals capable of handoff to the FA having a smaller number of the accommodated terminals. Dynamic Distribution Method of Accepting Subscribers by FA. The method of claim 9, The number set by the operator of the mobile communication system is half of the number of terminals that can be handed off. The method of claim 6, Step c-3), c-3-1) the base station giving a control command to handoff a predetermined number of terminals among the terminals capable of handoff through an overhead channel to a spare FA having a small number of the accommodated terminals; And c-3-2) a method of dynamically distributing subscribers by FAs of a base station in a mobile communication system, wherein the terminal receiving the control command performs a handoff between the congestion FA and the spare FA.

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