KR101513564B1 - Apparatus and method for resource reservation for moving network in a multi-hop relay wireless communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for reserving resources for a moving network in a wireless communication system using a multi-hop relay scheme. A method for resource reservation for a mobile relay station that performs handover according to the present invention includes the steps of the mobile relay station moving to a predictable predetermined route and the mobile relay station calculating a distance between the mobile relay station and the target base station, Determining, if the calculated distance is less than or equal to a predetermined reference value, one of neighboring base stations on the movement route using the predetermined movement route as a target base station; And transmitting the resource reservation request message to the target BS in response to the resource reservation request message including the handover timing information and the resource amount information to be requested to the target BS, And a step of acquiring a handover point, Determining a set of mobile relay stations to be handed over to another base station by the handover time; determining an occupied resource amount of mobile relay stations belonging to the set; comparing the requested resource amount and the occupied resource amount; Converting a requested resource amount of the occupied resources into a mark state and reserving resources when the requested resource amount is smaller than or equal to the occupied resource amount; and when the requested resource amount is larger than the occupied resource amount, Converting all of the resources into marks and reserving the resources, and converting a shortage of current available resources into a reserved state to reserve resources.

Multi-hop relay, broadband wireless access, handover, resource reservation

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a resource reservation apparatus and method for a moving network in a multi-hop relay wireless communication system,

The present invention relates to a handover apparatus and method for a moving network in a multi-hop relay wireless communication system, and more particularly to an apparatus and method for reserving resources to a target base station before an moving network (or mobile relay station) .

The fourth generation mobile communication system, which is a next generation communication system, has a very small radius in order to accommodate high-speed communication and a larger amount of money. In this case, a centralized design using the current wireless network design method is expected to be impossible. Therefore, the fourth generation communication system must be distributedly controlled and constructed, while being able to actively cope with environmental changes such as addition of a new base station. For the above reasons, a self-configuring wireless network is required in the 4th generation communication system.

In order to realistically implement the self-configuring wireless network required in the fourth generation communication system, a technology applied in the ad-hoc network must be introduced into the wireless communication system. Such a representative example is a multi-hop relay cellular network, which adopts an ad-hoc multi-hop relay scheme in a cellular network composed of fixed base stations.

FIG. 1 shows a configuration of a cellular network using a conventional multi-hop relay scheme.

The terminal 110 included in the area 101 of the base station 100 is connected to the base station 100 through a direct link and is located outside the area 101 of the base station 100, A terminal 120 having a poor channel state is connected to the base station 100 through a relay station 130. In this case, since the relay station 130 relays signals between the base station 101 and the terminal 120, a base station-terminal link, a base station-relay station link, and a relay station-terminal link can be configured. That is, when a terminal is located at a cell boundary of the base station 100 or is located in a shaded area where a shielding phenomenon due to a building or the like is severe, the terminal performs communication with the base station 100 through the relay station 130 . In this way, a multi-hop relay scheme can be applied in a cell boundary region where the channel state is poor, thereby providing a high-speed data channel and expanding the cell service region.

In the OFDM-based broadband wireless communication system using the multi-hop relay shown in FIG. 1, the relay station 130 may be an infrastructure relay station installed by a service provider and thus known and managed by the base station 100, Depending on the situation, a subscriber terminal (SS or MS) or a client relay operating as a relay station. The relay station 130 may be a fixed relay station having no mobility, a nomadic relay station having a nomadic characteristic (e.g., a notebook), or a mobile relay station having the same mobility as the MS. In particular, the mobile relay station may be installed in a transportation means such as a train, a bus, a ship, and the like, and the case where the relay station moves a plurality of terminals is referred to as a 'moving network'.

As described above, a relay station that relays communication between a terminal and a base station can have mobility. Therefore, in case of a mobile relay station, the service area of the base station or the upper relay station can be deviated. When the mobile relay station moves to the service area of a new upper relay station or a neighboring base station, the mobile relay station must be handed over to the terminal belonging to the service area of the mobile relay station or the lower relay station to guarantee continuous service.

In a typical single hop system, a resource is reserved to a target base station before a terminal performs a handover, thereby providing a seamless service to the terminal. At this time, the priority of the resource reservation can be differentiated according to the type and speed of the service received by the terminal. For example, in case of real-time service, it is necessary to secure more resources than non-real-time service to satisfy service quality.

On the other hand, when an moving network composed of a plurality of terminals such as a bus and a train moves, the amount of resources to be reserved by the target base station (BS) is very large and the moving speed is very fast. Therefore, This is unrealistic because of the large load. In case of moving network, it is necessary to plan the resource reservation more effectively by using the movement route and the time when the handover occurs. In addition, when the moving network reserves resources to the target base station, the reserved resources may cause the new service to be rejected, and there is a need to reduce the possibility of such new service rejection.

It is therefore an object of the present invention to provide an apparatus and method for reserving resources to a target BS in a multi-hop relay system before a mobile relay station performs a handover.

It is another object of the present invention to provide an apparatus and method for reserving resources in a multi-hop relay system using a handover point of a mobile relay station.

It is still another object of the present invention to provide an apparatus and method for providing seamless service to a mobile relay station that performs handover in a multi-hop relay system.

It is still another object of the present invention to provide an apparatus and method for reducing the possibility of rejecting a new service in a target BS due to resource reservation of a mobile relay station in a multi-hop relay system.

According to one aspect of the present invention, there is provided a method for performing handover with a target BS in a mobile relay station of a wireless communication system using a multi-hop relay scheme, Calculating a distance between the mobile relay station and the target base station, generating a resource reservation request message to be transmitted to the determined target base station if the calculated distance is less than or equal to a predetermined reference value, Transmitting a resource reservation request message to the target BS through the serving BS, the target BS including handover time information and resource amount information to be requested by the target BS, The process of receiving a response message to the resource reservation request message Wherein the response message includes at least one of an occupied resource amount of mobile relay stations that handover to a different base station from a time point at which a resource reservation request message is transmitted to a handover point among mobile relay stations belonging to the serving base station, And a message indicating that the resource is reserved based on the comparison result.

According to another aspect of the present invention, there is provided a method for processing a handover of a mobile relay station in a base station of a wireless communication system using a multi-hop relay method, the method comprising: receiving a resource reservation request message from a neighbor base station; Obtaining a requested resource amount and a handover point of a mobile relay station belonging to the neighbor base station from a request message and determining a set of mobile relay stations to be handed over to another base station from a current time point to a handover point, The method includes the steps of: determining an occupied resource amount of mobile relay stations belonging to the mobile relay stations; comparing the requested resource amount with the occupied resource amount; and if the requested resource amount is less than or equal to the occupied resource amount, ) State, and reserving resources; and A step of converting all of the occupied resources into a mark state and reserving resources when the requested resource amount is larger than the occupied resource amount, and reserving resources by converting the amount of current available resources to a reserved state .

According to another aspect of the present invention, there is provided a resource reservation method for a mobile relay station that performs handover in a multi-hop relay wireless communication system, the mobile relay station moves to a predictable predetermined route, Calculating a distance between the mobile relay station and the target base station; and if the calculated distance is less than or equal to a predetermined reference value, determining one of neighbor base stations on the mobile route And transmitting the resource reservation request message to the determined target base station. The resource reservation request message includes handover time information and resource amount information to be requested to the target base station, If the target BS receives the resource reservation request message, Determining a set of mobile relay stations to be handed over to another base station from a current point of time to a point of time of the handover; determining a resource amount of the mobile relay stations belonging to the set; Comparing the requested resource amount with the occupied resource amount; and, when the requested resource amount is less than or equal to the occupied resource amount, converting the requested resource amount into a mark state and reserving resources And converting the occupied resources into a mark state to reserve resources and converting a current amount of available resources into a reserved state to reserve resources, when the requested resource amount is larger than the occupied resource amount, The method comprising the steps of:

According to another aspect of the present invention, there is provided a mobile relay station apparatus in a multi-hop relay wireless communication system, the mobile relay station apparatus comprising: a target base station to be handed over and a handover time point; a distance between the mobile relay station and the target base station A message generator for generating a resource reservation request message including a handover point to be transmitted to the target BS when the calculated distance is less than or equal to a predetermined reference value; And a communication unit for transmitting the resource reservation request message to the serving base station and receiving a response message for the resource reservation request message from the target base station, Among the mobile relay stations belonging to the serving base station The mobile station is a message indicating that a resource is reserved based on a result of comparison between the amount of occupied resources of mobile relay stations that hand over to another base station from the time of transmitting the resource reservation request message to the handover point and the requested resource amount of the mobile relay station .

According to another aspect of the present invention, there is provided a base station in a multi-hop relay wireless communication system, comprising: a receiver for receiving a resource reservation request message from an adjacent base station; A message processor for acquiring a requested resource amount and a handover point of a mobile relay station belonging to the mobile relay station and a mobile relay station for handing over to another base station from a current point of time to the handover point and determining an occupied resource amount of mobile relay stations belonging to the set And when the requested resource amount is smaller than or equal to the occupied resource amount, converting the amount of the requested resource out of the occupied resources into a mark state to reserve the resource, and if the requested resource amount is larger than the occupied resource amount, mark) state to reserve resources It said current is converted by the insufficient amount of available resources as reserved (reserved) state is characterized by a controller to reserve resources.

As described above, in the multi-hop relay system, resource reservation is performed using the mobile relay station and the handover point in the multi-hop relay system, thereby providing a seamless service to the mobile relay station. There is an advantage in that the probability that a resource reservation is rejected and the rejection of a new service is reduced can be reduced by preferentially reserving an occupied resource of a relay station that handover from the target base station to another base station for a relay station of a neighboring cell.

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scheme for reserving a resource to a target BS before a mobile relay station (MRS) handover in a BWA (Broadband Wireless Access) communication system using a multi-hop relay scheme .

Herein, the BWA communication system using the multi-hop relay scheme may be applied to an OFDM (Orthogonal Frequency Division Multiplexing) scheme or an OFDMA (Orthogonal Frequency Division Multiplexing (OFDMA) Orthogonal Frequency Division Multiple Access (OFDMA) scheme.

However, the present invention can be similarly applied to a cellular-based communication system using a multi-hop relay scheme.

In addition, the present invention assumes a mobile relay station installed in a transportation means such as a bus or a train, and therefore, it is assumed that a mobile relay station can predict a movement route and a handover time.

FIG. 2 illustrates a message exchange procedure for resource reservation of a mobile relay station in a BWA system using a multi-hop relay scheme according to an embodiment of the present invention.

Referring to FIG. 2, in step 201, the mobile relay station 10 calculates a distance to a target base station to be handed over and checks whether the calculated distance is less than a predetermined reference value TH _D. At this time, if the distance to the target base station is less than the predetermined reference value, the mobile relay station 10 transmits a resource reservation request message to the serving base station 20 in step 203. Here, the resource reservation request message may include a requested resource amount of the mobile relay station 10, a handover time point, and an identifier of a target base station.

The handover time can be predicted as follows.

First, it is a method of predicting using the current speed and the distance from the target base station. (X1, y1) of the mobile relay station where the distance between the mobile relay station and the target base station is less than or equal to the reference value and the position (x2, y2) The handover time can be predicted as shown in Equation (1).

Here, T _current represents a time when the distance from the target base station is less than or equal to a reference value, and v represents a moving speed of the mobile relay station.

Second, it is a method to utilize the past movement route information of the mobile relay station. Since the mobile relay station always moves to the predetermined route, it is possible to obtain an average of the time required for moving the specific section in the past. Even if the same route is traveled, the speed can be changed according to traffic volume. By calculating the average time in each time zone, it is possible to predict the handover occurrence time relatively accurately.

Third, since the train always passes the same point at the same time, the handover point can be previously stored in a database for each base station on the movement route using the same database.

In step 205, the serving base station 20 converts the resource reservation request message from the mobile relay station 10 into a backbone message and transmits the message to the target base station 30 through the backbone network. At this time, the resource reservation request backbone message may include a requested resource amount of the mobile relay station 10, a handover time, an identifier of the mobile relay station 10, and the like.

Upon receipt of the resource reservation request backbone message, the target BS 30 transmits a set of moving networks (mobile relay stations) to which the target BS 30 handover to another BS from the _current time T _current to the handover point T _predict , (S).

Then, in step 209, the target BS 30 converts the resources occupied by the moving networks belonging to the set S to the mark state by the requested resource amount of the mobile relay station 10, and performs resource reservation . At this time, if the resource amount occupied by the set S is smaller than the requested resource amount of the mobile relay station 10, the target base station 30 converts the amount of free resources currently reserved to a reserved state And makes a resource reservation.

When the resource reservation for the mobile relay station 10 is completed, the target BS 30 generates a resource reservation response backbone message in response to the resource reservation request backbone message in step 211 and transmits the resource reservation response backbone message to the serving BS 20, Lt; / RTI > Then, in step 213, the serving BS 20 converts the resource reservation response backbone message into a message of a wireless interval (resource reservation response message) and transmits the message to the mobile relay station 10.

FIG. 3 illustrates an operation procedure of a mobile relay station in a wireless communication system using a multi-hop relay scheme according to an embodiment of the present invention.

Referring to FIG. 3, in step 301, the mobile relay station 10 predicts a target base station to be handed over. Here, the mobile relay station 10 can predict the target base station to be handed over next, using the past movement route. If the target base station to be handed over is determined, the mobile relay station 10 calculates the distance d to the target base station in step 303. If it is assumed that the location of the target base station is known in advance, the current location of the mobile relay station 10 is estimated, and the distance d is calculated using the estimated current location and the location of the target base station. Can be calculated.

In step 305, the mobile relay station 10 determines whether the calculated distance d is less than or equal to a predetermined reference value TH _D. That is, it is checked whether or not the resource reservation time to the target base station has been reached. If the distance d to the target base station is greater than the reference value, the mobile relay station 10 returns to step 303 to calculate the distance again.

If the distance d to the target base station is less than or equal to the reference value, the mobile relay station 10 proceeds to step 307 to generate a resource reservation request message. Here, the resource reservation request message may include a requested resource amount of the mobile relay station 10, a handover time, and an identifier of the target base station. The handover time can be predicted by various methods as described above.

In step 309, the mobile relay station 10 transmits the resource reservation request message to the serving base station 20. Then, the serving BS 20 converts the resource reservation request message into a backbone message and transmits the backbone message to the target BS.

After transmitting the resource reservation request message, the mobile relay station 10 determines in step 311 whether a resource reservation response message is received. Upon receipt of the resource reservation response message, the mobile relay station 10 terminates the algorithm after successful resource reservation in step 313. If the resource reservation response message is not received within the set time, the mobile relay station 10 ends the resource reservation failure process in step 315 and terminates.

FIG. 4 illustrates an operation procedure of a target base station in a wireless communication system using a multi-hop relay scheme according to an embodiment of the present invention. Basically, a base station receives a resource reservation request message from a mobile relay station moving to another base station, converts the resource reservation request message into a backbone message, and transmits the message to a target base station, thereby managing a handover point of mobile relay stations belonging to its own region .

Referring to FIG. 4, in step 401, the target BS 30 determines whether a resource reservation request backbone message is received from the neighbor BS. Here, the resource reservation request backbone message may include a requested resource amount of a mobile relay station belonging to the neighbor base station, a handover time, an identifier of the mobile relay station, and the like. Upon receiving the resource reservation request backbone message, the target BS 30 analyzes the message in step 403 and confirms a request resource amount (R _request ) and a handover point of the mobile relay station.

In step 405, the target base station 30 determines a set S of moving networks (mobile relay stations) to which the target base station 30 handover to another base station from the _current time T _current to the handover time T _predict . In step 407, the target base station 30 confirms the occupied resource amount ( _occupied ) occupied by the moving networks belonging to the set (S).

In step 409, the target BS 30 determines whether the requested resource amount (R _request ) of the mobile relay station is smaller than the occupied resource amount (R _occupied ). If the requested resource amount R _request is less than or equal to the occupied resource amount R _occupied , the target base station 30 marks the requested resource amount among the resources occupied by the moving networks in step 415, State and reserves resources, and then proceeds to step 417. In step 417,

If the requested resource amount (R _request ) is greater than the occupied resource amount (R _occupied ), the target BS 30 proceeds to step 411 and converts all resources occupied by the moving networks into a mark state Reserve resources. On the other hand, the target BS 30 proceeds to step 413 in which the target BS 30 performs resource reservation by converting a shortage amount of free resources into a reserved state.

In step 417, the target BS 30 generates a resource reservation response backbone message in response to the resource reservation request backbone message. In step 419, the target BS 30 transmits the resource reservation message Response backbone message to the serving base station of the mobile relay station. Then, the serving BS converts the resource reservation response backbone message into a message of a wireless interval (resource reservation response message) and transmits the message to the mobile relay station.

Figure 5 illustrates a specific example for better understanding of the present invention.

Assume that the total resource amount of the target base station is WT, the free resource amount is WF, and the request amount of the mobile relay station is WM. In addition, the total amount of resources occupied by the moving networks belonging to the set S is referred to as WS, and the amount of resources other than the mark status is assumed to be WU.

Let us first consider the case of WM <WU.

(a), the existing scheme reserves the amount of resources requested by the mobile relay station among the available resources. However, the proposed method according to the present invention converts a requested resource amount among the resources (non-mark state resources) occupied by moving networks into a mark state to reserve resources. On the other hand, when the moving network using the resource of the mark state handover to another base station, the resource of the mark state is not allocated to another mobile relay station or the terminal since it is already reserved for handover. As described above, the present invention can reduce the possibility of rejection (blocking) of a new service because the amount of available resources of the target base station remains unchanged even though resources are reserved for the mobile relay station.

Next, consider the case of WM> WU.

the WM-WU, which is the deficient WM-WU, is reserved in the WF, as shown in FIG. 5B, by converting all the resources (non-mark resources) occupied by the moving networks into the mark state. Thus, the available state resources at the target base station are WF- (WM-WU). On the other hand, since the available resources are WF-WM, the present invention can reduce the possibility of rejecting new services than existing ones.

As described above, the present invention divides a state of a resource into occupied, marked, reserved, and free states. Here, the resource in the occupied state represents a resource occupied by mobile relay stations that handover to another base station (a resource that is not a mark state). The resource in the mark state is currently used but represents a resource reserved for the relay station of the neighboring cell. The resource in the reserved state is not currently used, but indicates a resource reserved for the relay station of the adjacent cell. And the resources in the available state represent available resources that can be allocated for the new service.

FIG. 6 shows a block configuration of a base station (or mobile relay station) according to an embodiment of the present invention. Here, since the base station having the same interface module (communication module) and the mobile relay station have the same block configuration, the operation of the base station and the mobile relay station will be described below with reference to FIG. Hereinafter, a description will be given assuming a TDD-OFDMA system. However, the present invention can be easily applied to an FDD-OFDMA system, a hybrid system using TDD and FDD together, and a cellular-based system using another resource partitioning scheme.

As shown, the base station (or mobile relay station) according to the present invention includes an RF processor 601, an ADC 603, an OFDM demodulator 605, a decoder 607, a message processor 609, a controller 611, A message generator 613, an encoder 615, an OFDM modulator 617, a DAC 619, an RF processor 621, and a duplexer 623.

6, the duplexer 623 first transmits a transmission signal from the RF transmitter 621 through an antenna according to a duplexing scheme, and provides a reception signal from the antenna to the RF receiver 601. FIG. For example, in the case of a TDD (Time Division Duplex) scheme, the duplexer 623 transmits a signal from the RF transmitter 621 through the antenna when it is in a transmission interval, Signal to the RF receiver (601).

The RF receiver 601 converts an RF (Radio Frequency) signal received through an antenna into a baseband analog signal. The ADC 603 converts the analog signal from the RF receiver 601 into sample data and outputs it. The OFDM demodulator 605 performs Fast Fourier Transform (FFT) on the sample data output from the ADC 603 to convert the data into frequency domain data, and selects and outputs data of subcarriers to be actually received in the frequency domain data .

The decoder 607 demodulates and decodes the data from the OFDM demodulator 605 according to a predetermined modulation level (MCS level) and outputs the demodulated and decoded data.

The message processor 609 decomposes the control message input from the decoder 607 and provides the result to the controller 611. The control unit 611 performs processing for the information from the message processing unit 609, generates information to be transmitted, and provides the generated information to the message generating unit 613. Here, it is assumed that the controller 611 performs resource scheduling. The message generator 613 generates a message with various types of information provided from the controller 611 and outputs the message to the physical layer encoder 615.

The encoder 615 codes and modulates the data from the message generator 613 according to a predetermined modulation level (MCS level). The OFDM modulator 617 IFFTs (Inverse Fast Fourier Transforms) the data from the encoder 615 and outputs sample data (OFDM symbol). The DAC 619 converts the sample data into an analog signal and outputs the analog signal. The RF transmitter 621 converts an analog signal from the DAC 619 into an RF (Radio Frequency) signal and transmits the RF signal through an antenna.

In the above-described configuration, the control unit 611 controls the message processing unit 609 and the message generating unit 613 as a protocol control unit. That is, the controller 611 may perform the functions of the message processor 609 and the message generator 613. In the present invention, these are separately configured to distinguish the respective functions. Accordingly, in the case of actual implementation, all of them can be processed by the control unit 611, and only a part of them can be processed by the control unit 611.

In addition, the controller 611 receives information necessary for performing a protocol process to a corresponding component of the physical layer or generates a control signal to the corresponding component of the physical layer.

The operations of the base station and the mobile relay station according to the present invention will now be described with reference to FIG.

First, the operation of the mobile relay station will be described as follows.

The control unit 611 predicts the target base station to be handed over next using the past movement route and calculates the distance to the target base station. When the distance from the target base station is less than a predetermined reference value, the controller 611 predicts a handover time. The controller 611 provides the message generator 609 with information necessary for generating a resource reservation request message.

The message generator 613 generates the resource reservation request message using the information from the controller 611. Here, the resource reservation request message may include a requested resource amount, a handover time point, and an identifier of a target BS. Meanwhile, the message generated by the message generator 613 is processed in a form that can be transmitted in the physical layer, and then transmitted to the serving BS.

Meanwhile, the mobile relay station receives a resource reservation response message in response to the resource reservation request message. That is, the message processing unit 609 analyzes the resource reservation response message transmitted from the physical layer, and provides the result to the controller 611.

Next, the operation of the base station will be described.

Basically, a base station receives a resource reservation request message from a mobile relay station moving to another base station, converts the resource reservation request message into a backbone message, and transmits the message to a target base station, thereby managing a handover point of mobile relay stations belonging to its own region . Hereinafter, the operation of the target base station will be described.

If a resource reservation request backbone message is received from the neighbor base station, the control unit 611 checks the handover timing (T _predict ) and the requested resource amount (R _request ) of the neighboring mobile relay station included in the backbone message. The controller 611 determines a set S of moving networks (mobile relay stations) that handover to another base station from the current time T _current to the handover time T _predict . Thereafter, the controller 611 reserves the requested resource amount of the mobile relay station. At this time, the occupied resources (non-mark resources) of the moving networks belonging to the set S are preferentially reserved, and the insufficient resources are reserved from the currently available resources.

When the resource reservation for the mobile relay station is completed, the controller 611 instructs to generate a resource reservation response backbone message in response to the resource reservation request backbone message. Then, the message generator 613 generates the resource reservation response backbone message. The generated resource reservation response backbone message is processed through a backbone interface unit (not shown) and then transmitted to the serving base station of the mobile relay station.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1 illustrates a configuration of a cellular network using a conventional multi-hop relay scheme;

2 is a diagram illustrating a message exchange procedure for resource reservation of a mobile relay station in a multi-hop relay BWA system according to an embodiment of the present invention;

3 is a diagram illustrating an operation procedure of a mobile relay station in a wireless communication system using a multi-hop relay scheme according to an embodiment of the present invention.

4 is a flowchart illustrating an operation procedure of a target BS in a wireless communication system using a multi-hop relay scheme according to an embodiment of the present invention.

Figure 5 illustrates a specific example for better understanding of the present invention.

6 is a block diagram of a base station (or mobile relay station) according to an embodiment of the present invention;

Claims (25)

A method for performing handover with a target base station in a mobile relay station of a wireless communication system using a multi-hop relay scheme, Determining a target base station to be handed over; Calculating a distance between the mobile relay station and the target base station; Generating a resource reservation request message to be transmitted to the determined target base station if the calculated distance is less than or equal to a predetermined reference value; and the resource reservation request message includes handover time information and resource amount information to be requested to the target base station In addition, Transmitting the resource reservation request message to the target BS through a serving BS; And receiving a response message for the resource reservation request message from the target base station, The response message includes a comparison result between the amount of occupied resources of the mobile relay stations that hand over to another base station from the time point of transmission of the resource reservation request message to the handover point and the requested resource amount of the mobile relay station among the mobile relay stations belonging to the serving base station, Wherein the message is a message indicating that a resource is reserved based on the resource. The method of claim 1, wherein the handover target base station determining step comprises: Wherein the mobile relay station moves to a predictable predetermined path and determines one of the neighboring base stations on the mobile path as a target base station using the predetermined mobile path. The method according to claim 1, Wherein the handover time information is estimated using a distance between the target BS and the mobile relay station. delete The method according to claim 1, Wherein the resource reservation request message further comprises identifier information of the mobile relay station. A method for handling a handover of a mobile relay station in a base station of a wireless communication system using a multi-hop relay scheme, Receiving a resource reservation request message from an adjacent base station; Obtaining a requested resource amount and a handover point of a mobile relay station belonging to the neighbor base station from the resource reservation request message; Determining a set of mobile relay stations to be handed over to another base station from a current time point to the handover time point; Determining an occupation resource amount of mobile relay stations belonging to the set; Comparing the requested resource amount with the occupied resource amount; If the requested resource amount is smaller than or equal to the occupied resource amount, converting the requested resource amount into mark status and reserving resources, A process of converting all of the occupied resources into a mark state to reserve resources when the requested resource amount is larger than the occupied resource amount and converting a current amount of available resources into a reserved state to reserve resources, &Lt; / RTI &gt; delete The method according to claim 6, Wherein the resource reservation request message includes at least one of a requested resource amount of the mobile relay station, a handover point, and an identifier of a mobile relay station. delete The method according to claim 6, Wherein the occupancy resource is a resource other than a mark state. The method according to claim 6, A process of managing the entire resources by dividing them into occupied, marked, reserved, and free states, And performing call admission control based on the resources in the available state with respect to the new service. The method according to claim 6, Further comprising the step of constructing a resource reservation response message and transmitting the resource reservation response message to the mobile relay station after completion of resource reservation for the mobile relay station. A resource reservation method for a mobile relay station performing handover in a wireless communication system using a multi-hop relay method, The mobile relay station moves to a predictable predetermined path and the mobile relay station determines one of the neighboring base stations on the mobile path as a target base station using the predetermined mobile path; Transmitting a resource reservation request message to the determined target BS if the calculated distance is less than or equal to a predetermined reference value; Wherein the resource reservation request message includes handover time information and resource amount information to be requested to the target base station, Obtaining a resource amount and a handover point of the mobile relay station from the resource reservation request message; Determining a set of mobile relay stations to be handed over to another base station from a current time point to the handover time point; Determining an occupation resource amount of mobile relay stations belonging to the set; Comparing the requested resource amount with the occupied resource amount; If the requested resource amount is smaller than or equal to the occupied resource amount, converting the requested resource amount into mark status and reserving resources, A process of converting all of the occupied resources into a mark state to reserve resources when the requested resource amount is larger than the occupied resource amount and converting a current amount of available resources into a reserved state to reserve resources, &Lt; / RTI &gt; delete 15. The method of claim 14, Further comprising the step of, after completion of resource reservation for the mobile relay station, the target base station configuring a resource reservation response message and transmitting the resource reservation response message to the mobile relay station. A mobile relay station apparatus in a wireless communication system using a multi-hop relay scheme, A control unit for determining a handover point and a target base station to be handed over and calculating a distance between the mobile relay station and the target base station, A message generator for generating a resource reservation request message including a handover time to be transmitted to the target BS when the calculated distance is less than or equal to a predetermined reference value; Resource amount information to be requested, And a communication unit for transmitting the resource reservation request message to the serving base station and receiving a response message for the resource reservation request message from the target base station, The response message includes a comparison result between the amount of occupied resources of the mobile relay stations that hand over to another base station from the time point of transmission of the resource reservation request message to the handover point and the requested resource amount of the mobile relay station among the mobile relay stations belonging to the serving base station, Wherein the message is a message indicating that the resource is reserved based on the resource. 17. The method of claim 16, Wherein the mobile relay station moves to a predictable predetermined path and the control unit determines one of neighboring base stations on the mobile path as a target base station by using the predetermined mobile path. 17. The method of claim 16, Wherein the handover time information is estimated using the distance between the target BS and the mobile relay station. delete A base station apparatus in a wireless communication system using a multi-hop relay scheme, A receiver for receiving a resource reservation request message from an adjacent base station; A message processor for analyzing the resource reservation request message to obtain a requested resource amount and a handover point of a mobile relay station belonging to the neighbor base station; Determining a set of mobile relay stations to be handed over to another base station from a current point of time to the handover point, determining an occupied resource amount of mobile relay stations belonging to the set, and, when the requested resource amount is less than or equal to the occupied resource amount, And converting the occupied resources into mark states and reserving the resources when the requested resource amount is larger than the occupied resource amount, To a reserved state, and reserves a resource. delete 21. The method of claim 20, Wherein the resource reservation request message includes at least one of a requested resource amount of the mobile relay station, a handover time, and an identifier of a mobile relay station. delete 21. The method of claim 20, Wherein the occupancy resource is a resource that is not a mark state. 21. The apparatus of claim 20, Managing the entire resource in an occupied, marked, reserved, and free state, and performing call admission control based on the resource in the available state for the new service Lt; / RTI &gt;

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