KR100666397B1 - Apparatus and method of hand-off call admission control in wireless system based on packet - Google Patents

Abstract

The present invention relates to a rock lock control apparatus and method for handoff in a packet-based wireless communication system.

The present invention provides a congestion check module for determining a current channel state, a lock lock control module for performing a handoff call or a lock call control of a new call according to a channel state determination result of the congestion check module and a service quality of a requested call; In order to accept the request of the handoff call requesting the high quality in the congested state, a downlink service class queue storing the non-real-time service call information with the minimum bandwidth, and when the channel state is changed from the congested state to the non-congested state, A hand requesting a high quality by additionally configuring a billing matching module by controlling a rock lock at the time of handoff, including a MAC scheduler module for extracting a service having a lower service level from the downlink service level queue to satisfy a corresponding service quality. Allows to charge for off-call congestion.

According to the present invention, the lock control is performed according to the state of the channel, the type of the connection request call, and whether or not the high quality service is required, so that the limited radio resources can be used more efficiently and the charging can be made evenly.

Handoff, High Quality Service, Downgrade Service Level, QoS, Channel Status

Description

Apparatus and method of hand-off call admission control in wireless system based on packet}

1 is a block diagram showing the structure of a packet-based wireless communication system.

2 is a block diagram illustrating a structure of a rock lock control device during handoff in a packet-based wireless communication system according to an exemplary embodiment of the present invention.

3 is a state transition diagram for detecting a congestion state of a rock lock control device during handoff in a packet-based wireless communication system according to an exemplary embodiment of the present invention.

FIG. 4 is a flowchart illustrating a method for controlling rock lock during handoff in a packet-based wireless communication system according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating a downlink service recovery operation according to an embodiment of the present invention.

The present invention relates to an apparatus and a method for controlling a lock lock during handoff in a wireless communication system. In particular, the present invention relates to a lock lock during handoff in a packet-based wireless communication system for controlling lock lock according to a packet-based service class. A control apparatus and method are provided.

In the next generation mobile communication network, a large capacity multimedia service as well as a conventional voice call service is required based on packets, and each user requires a higher quality wireless service.

In addition, in order to efficiently use the limited frequency resources, the service provider provides a service by reducing the size of the cell, which causes the mobile terminal to perform a frequent handoff procedure.

In this situation, the emergence of a mobile communication system with high-speed data processing and high bandwidth is inevitable.However, a method of efficiently using limited radio resources in accordance with the user's service needs is required in an advanced stage. It is essential to improve the overall performance of the system.

In a mobile communication system, handoff between cells occurs due to mobility of mobile terminals, and when a mobile terminal enters a new cell, congestion of radio resources for the corresponding terminal is impossible due to congestion.

In this case, if you block the service of the terminal, the user will have a low satisfaction with the quality of service.

Conventional techniques for a call admission control method when a handoff occurs due to movement of a mobile station include a guard channel allocation scheme, a priority queuing scheme, and a channel borrowing scheme.

The conventional techniques described above are mostly techniques for reducing the blocking probability of a handoff call by blocking a new call in a cell where a handoff has occurred or a neighboring cell, thereby increasing the performance of the overall system but increasing call establishment requests. As a result, handoff calls and new call blocking probabilities are increased.

In particular, due to the congestion caused by the call establishment request at a certain time when the call establishment request is congested, the quality of service (QoS) and the quality of service (QoS) of the subscriber cannot be guaranteed.

For example, in case of using the guard channel allocation technique, when the occurrence of handoff calls and new calls is congested, the number of guard channels increases and the blocking probability of new calls is increased to reduce the probability of blocking the handoff call under a given limit. .

In case of using priority queuing technique, if call establishment request is congested, each call establishment request can be queued and service cannot be provided until existing call establishment is released. There are no drawbacks.

In order to solve the above problems, the present invention provides an apparatus and method for rock lock during handoff in a packet-based wireless communication system that enables call admission control in consideration of limited radio resources and characteristics of each service. There is this.

An apparatus for controlling rock lock at handoff in a packet-based wireless communication system according to one aspect of the present invention,

In the hand-locking device during handoff at the base station of the wireless communication system performing packet data communication with the terminal, the capacity of the radio resource allocated by the base station and the incoming handoff call control demand and a new call are started. A congestion state inspection module for determining a current channel state based on a new call control request amount for performing a call; A rock lock control module performing rock lock control of a handoff call or a new call according to a channel state determination result of the congestion check module and a service quality of a requested call; A downlink service class queue for storing non-real-time service call information with minimized bandwidth in order to accept a request of a handoff call requesting high quality in a congested state as a result of the channel state determination of the congestion state inspection module; And a MAC (Media Access Control) scheduler module for extracting a service having a lower service level from the downlink service level queue to satisfy a corresponding service quality when the channel state is changed from a congested state to a non-congested state.

In the packet-based wireless communication system according to an aspect of the present invention, the rock lock control method in the handoff,

A handover control method for handoff at a base station of a wireless communication system performing packet data communication with a terminal, the method comprising: (a) checking a current channel state according to a request for a handover request from the terminal; (b) if the current channel state is congested, determining whether the requested call from the terminal is a handoff call or a new call: (c) as a result of the determination, the call requested from the terminal In the case of the off call, determining whether there is sufficient radio resource for the requested handoff call, and if the radio resource is not sufficient, determining whether the corresponding handoff request call requires high quality; And (d) when the handoff request call requires a high quality, minimizing the bandwidth of the connection for the non-real-time service if there is a connection for the non-real-time service to secure resources for accepting the requested handoff call. And the lake, and storing the non-real-time service information.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the accompanying drawings, parts irrelevant to the description of the present invention are omitted in order to clearly describe the present invention, and the same or similar parts are denoted by the same reference numerals.

1 is a block diagram showing the structure of a packet-based wireless communication system.

Referring to FIG. 1, a packet-based wireless communication system performing packet data transmission and reception with a terminal 100 includes a base station 200, an IP network 300, and a charging server 400.

The terminal 100 requests and receives a service with mobility, and the base station 200 has a cell, which is a unique communication area, and performs radio resource allocation and radio transmission in each cell.

In addition, the Internet service can be provided through the IP network 300, and the charging server 400 performs the charging according to the service usage of the terminal 100.

The base station 200 has a rock lock control function that performs rock lock or reject according to the call connection request from the terminal 100.

2 is a block diagram illustrating a structure of a rock lock control apparatus during handoff in a packet-based wireless communication system according to an exemplary embodiment of the present invention.

Referring to Figure 2, it shows a rock lock control device of the base station in the wireless communication system congestion state inspection module 210, rock lock control module 220, billing matching module 230, MAC (Media Access Control) scheduler 240 and the downward grade of service queue 250.

) 및 새로운 호를 시작하기 위한 신규호 제어 요구량(

)을 기반으로 현재의 채널 혼잡 상태를 판단하는 기능을 수행한다.The congestion inspection module 310 is the capacity of the radio resources currently allocated by the base station and the amount of handoff call control required (

) And new call control requirements to initiate a new call (

) To determine the current channel congestion state.

At this time, the incoming demand is required as a time slot based on time.

And the lake lock control module 220 controls the lake lock request message according to the congestion state inspection result of the congestion state inspection module 210.

The charging matching module 230 is a function for imposing additional congestion charges, not general charges, when a user who requests a high quality service is provided with a service when a radio resource allocation state is congestion (CS). Do this.

The MAC scheduler module 240 performs a function of scheduling a radio resource in conjunction with the call admission control module 220. When the MAC scheduler transitions from a congested state to a non-congested state, the service grade is lowered from the downlink service class queue 250. The radio resources are allocated to satisfy the QoS by extracting the service.

The downlink service class queue 250 is a non-real-time service for which the QoS control is lowered to accommodate the high quality handoff call control request requested by the user when the radio resource allocation state is congested. Stores information about the connection.

In this case, the information stored in the downlink service class queue 250 includes an identifier of the mobile station, a connection identifier, currently allocated QoS information, and initially set QoS information.

와

의 합으로 현재 해당 기지국으로 전송되는 호 요청 정도를 인지하고, 이를 기반으로 전체 자원할당 가능량(

)에 대한 유입되는 호 요청 정도의 비율로써 현재의 혼잡상태인자(

)를 계산할 수 있으며, 수학식 1과 같이 계산된다.Congestion state inspection module 210 in the rock lock control device at the time of handoff according to an embodiment of the present invention having the above structure is

Wow

As a sum, it recognizes the degree of call request currently being transmitted to the corresponding base station and based on the total resource allocation possible (

Is the ratio of incoming call requests to the current congestion factor (

) Can be calculated and calculated as in Equation 1.

)보다 클 경우 해당 기지국에서 무선자원할당에 대한 혼잡상태로 인식한다.Using the congestion state factor calculated in Equation 1, the congestion state inspection module 210 determines the current radio resource allocation state, and the congestion state factor is the congestion state threshold (

If greater than), the base station recognizes a congestion state for radio resource allocation.

In addition, the congestion state inspection module 210 determines the congestion state and the non-congestion state as shown in Equation 2 using the congestion state threshold.

Equation 2 shows a method of determining a current channel state using a congestion factor and a congestion threshold.

If the congestion factor factor is equal to or greater than the congestion threshold, it is recognized as a congestion state, otherwise it is recognized as a non-congestion state (NCS).

The following describes the state change in the rock lock control module 220 of the base station using the congestion state factor and the congestion state threshold.

3 is a state transition diagram for detecting a congestion state of a rock lock control device during handoff in a packet-based wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, in the two states of the congestion state (CS) 320 and the non-congestion state (NCS) 310, the rock lock control module 220 of the base station performs a state transition.

The congestion state 320 represents a case where the congestion state factor is greater than the congestion state threshold, and the non-congestion state 310 represents a case where the congestion state is less than the congestion state threshold.

In addition, state transition is possible according to each radio resource allocation state. If the current radio resource allocation state is a congestion state 320, the incoming new call control request is rejected, and the call accept procedure is performed only for the handoff call control request.

In this case, the call control request is allowed when the assignable radio resource is the same or more than the required call control request, and the call control request is available when the assignable radio resource is the same or more than the required call control request. In case the allowable radio resource is smaller than the required call control requirement, MN minimizes the bandwidth for the currently allocated NRT service and uses it to perform the call acceptance procedure corresponding to the requested handoff call control request. .

When transitioning to the non-congestion state 310, the non-real-time services with the minimized bandwidth are returned to the original service class within the range allowed by the allocable radio resource.

)은 사용자의 초기 연결설정시의 요청으로 부과되며, 혼잡상태에서 사용자의 요구 서비스를 수용할 수 있을 경우에만 수학식 3과 같이 일반과금(

) 및 혼잡상태 임계를 이용하여 부과한다.And charging matching module 230 is additional congestion charging (

) Is charged as a request when the user establishes the initial connection, and the general billing (

) And congestion thresholds.

In addition, the billing matching module 230 performs a function of reporting the identifier and use time of the specific mobile terminal in the current base station in conjunction with the billing server of the communication service provider, based on this information, the billing server performs the charging procedure of the mobile terminal do.

The method for rock lock control based on the operation of the rock lock control device at the time of handoff in the packet-based wireless communication system according to the above-described features is as follows.

FIG. 4 is a flowchart illustrating a method for controlling rock lock during handoff in a packet-based wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, when a rock lock request comes from the outside (S401), the congestion check module 210 determines whether the congestion state or the congestion state is checked by checking the current channel state (S402).

If the current channel is in a non-congested state, the lake lock control module 220 checks whether there are enough radio resources for the lake lock (S403), and if there are enough resources, allows the lake lock (S408).

However, if there is not enough radio resources, check whether the requested call is a handoff call or a new call (S404), if the request for a new call is rejected (S405), and if it is a handoff call, the hand is in a congested state. Perform rock lock control in the same way as the off call.

That is, as a result of the determination in step S402, if the state of the channel is congested, the type of the requested call is determined (S406), and in the case of a new call, the lock is rejected (S417).

In addition, if the requested call is a handoff call, it is determined whether there is enough radio resource for handoff (S407), and if there is a radio resource for handoff, the call is allowed (S408). Check whether the call requires a high quality (S409).

If the call is not a call requesting high quality, it is rejected (S417), and if the call is requesting high quality, it is determined whether a connection for non-real time service exists in another call using the current channel (S410).

If there is no connection for the non-real time service, the call is rejected (S417). If there is a connection for the non-real time service, if the connection for the non-real time service is minimized, the call requesting the high quality is accepted. Check whether it can (S411).

And if it cannot accept a call requesting high quality, it is also rejected (S417), and if it can accept a call requiring high quality, minimize the resources of the call for the connection of the non-real-time service (S412). At this time, the information on the connection minimizing the resource is stored in the downlink service level queue 250 (S413).

By minimizing the resources of the call for the connection of the non-real-time service, the radio resource allocation for the request of the handoff call is performed using the remaining bandwidth (S414), and the lock is performed. The resource allocation information is updated (S416).

In addition, after the service call requesting the high quality is terminated, the connection of the non-real-time service minimized in step S412 should be restored to its original state. The operation is as follows.

5 is a flowchart illustrating a downlink service recovery operation according to an embodiment of the present invention.

Referring to FIG. 5, in order to recover a bandwidth of a non-real-time service whose usage bandwidth is minimized by a handoff call requiring high quality, a timer for searching for a downlink service class queue 250 is operated (S510). As a result, the resource allocation for the non-real-time service exists, and it is checked whether or not the congestion state (S520).

When the call requesting the high quality is terminated or another general call is terminated and resources remain, the connection setting is performed through the initially set service class (S530), and the information of the downlink service class queue 250 is updated (S540). .

The radio resource allocation information is updated (S550).

In this case, re-establishing the connection by applying the existing quality of service allows the MAC scheduler module 240 to establish a connection by performing scheduling using the remaining resources according to each non-real-time service level.

Although a preferred embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various other changes and modifications are possible.

As described above, the apparatus and method for rock lock at the time of handoff in the packet-based wireless communication system according to the present invention performs lock lock according to the state of the channel, the type of the connection request call, and whether the high quality service is required. It is effective to use limited radio resources more efficiently and to apply fair charging policy by granting additional charges according to the priorities for high quality service.

Claims (17)

A handover control apparatus for handoff at a base station of a wireless communication system performing packet data communication with a terminal, A congestion check module for determining a current channel state based on a capacity of a radio resource allocated by the base station, an incoming handoff call control request, and a new call control request for starting a new call; A rock lock control module performing rock lock control of a handoff call or a new call according to a channel state determination result of the congestion check module and a service quality of a requested call; A downlink service class queue for storing non-real-time service call information with minimized bandwidth in order to accept a request of a handoff call requesting high quality in a congested state as a result of the channel state determination of the congestion state inspection module; And When the channel state is changed from the congested state to the non-congested state, a MAC (Media Access Control) scheduler module for extracting a service whose service grade is lowered from the downlink service class queue and satisfying the corresponding quality of service. Apparatus for rock lock during handoff in a packet-based wireless communication system comprising a. The method of claim 1, And a lock matching module configured to perform additional congestion charging for a high quality service call allowing the rock lock control module to allow rock lock. The method of claim 1, The congestion inspection module, A congestion state factor is calculated by using a handoff call control requirement, a new call control requirement for starting a new call, and a resource allocation capacity of the base station as a whole, and the congestion state or non-congestion is compared by comparing the calculated congestion factor and the congestion state threshold. Apparatus for rock lock during handoff in a packet-based wireless communication system characterized in that the state is determined. The method of claim 3, wherein The congestion factor (

) Is a rock lock control device during handoff in a packet-based wireless communication system, characterized in that calculated by the following equation.

Is the handoff call control requirement;

Is the new call control requirement;

Is the total resource allocation available amount of the base station The method of claim 3, wherein The congestion factor is the congestion threshold (

Greater than or equal to), judges congestion, And the congestion state factor is smaller than the congestion state threshold. The method of claim 2, The additional congestion charge (

) Is a rock lock control device in the handoff in a packet-based wireless communication system, characterized in that calculated by the following equation.

Silver general billing

Is the congestion threshold In the handover control method in the handoff at the base station of the wireless communication system for performing packet data communication with the terminal, (a) determining whether a congestion state or a non-congestion state that checks a current channel state is in response to a request from the terminal; (b) if it is determined in step (a) that the current channel state is congested, determining whether the requested call from the terminal is a handoff call or a new call: (c) If it is determined in step (b) that the call requested from the terminal is a handoff call, it is determined whether there is enough radio resource for the requested handoff call, and if there is not enough radio resource, the corresponding handoff Determining whether the request calls for high quality; And (d) if it is determined in step (c) that the handoff request call requires high quality, if there is a connection for the non-real time service, the requested handoff call is minimized by minimizing the bandwidth of the connection for the non-real time service; Secure the resources for acceptance and enjoy the lake, and storing the non-real-time service information A method for controlling rock lock at the time of handoff in a packet-based wireless communication system comprising a. The method of claim 7, wherein In the step (a), Calculating a congestion state factor based on a handoff call control requirement flowing into the base station, a new call control requirement for starting a new call, and a total resource allocation capacity of the base station; And Recognizing a congestion state if the congestion factor factor is greater than a congestion state threshold; A method for controlling rock lock at the time of handoff in a packet-based wireless communication system comprising a. The method of claim 8, And recognizing a non-congestion state if the congestion factor is less than or equal to the congestion threshold. The method of claim 7, wherein If it is determined in step (a) that the channel state of the base station is the non-congested state, determining whether there is sufficient radio resource for a lake lock; If it is determined that the radio resource is sufficient, if the call for the lock lock is a lock lock request for a new call, the lock lock control method when handoff in a packet-based wireless communication system comprising the step of accepting the call request . The method of claim 7, wherein In step (a), it is determined that the channel state of the base station is not congested, and when there is a call request for a handoff call, the packet-based radio, characterized in that steps (c) and (d) are performed. How to control the rock lock during handoff in the communication system. The method of claim 7, wherein In the step (b), it is determined that the state of the current channel is congested, and if there is a request for a new call, the call is rejected when handoff in a packet-based wireless communication system including the call. Admission control method. The method of claim 7, wherein And rejecting the call if it is determined in step (c) that the corresponding handoff request call does not require high quality. The method of claim 7, wherein If it is determined in step (d) that there is no connection for the non-real-time service, rejecting the request for the handoff call, rock lock control method in a handoff in a packet-based wireless communication system. The method of claim 7, wherein In step (d), If there is a connection for a non-real-time service, packet-based wireless communication comprising the step of rejecting the call, if there is not enough radio resources to accept the high-quality handoff call by minimizing the connection of the non-real-time service How to control the rock lock on handoff in the system. The method of claim 7, wherein After accepting the high quality handoff call, if the resource search is performed at regular intervals so that the high quality handoff call is terminated or radio resources are generated due to the termination of another service call, And performing resource allocation for service quality recovery for the NRT service call with the minimum bandwidth. The method of claim 7, wherein In step (d), After accepting the high quality handoff call, Calculating and imposing additional congestion charges for the high-quality handoff call based on the general charge and congestion state thresholds.

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