KR20070018665A - Methdo and apparatus for allocating communication resources using virtual circuit switching in a wireless communication system and method for transmitting/receiving data in a mobile station - Google Patents

Abstract

The present invention proposes a virtual circuit switching scheme as a new resource allocation and operation scheme combining the advantages of the conventional circuit switching scheme and the packet switching scheme. In the virtual circuit switched method according to the present invention, when a base station allocates resources of a dedicated channel to a user in a conventional circuit switched method and then transmits data to the user, the base station transmits data through the dedicated channel and does not transmit data to the user. If not, the data of another user is transmitted by allocating a resource of a pre-allocated dedicated channel as a resource of a shared channel. Therefore, according to the present invention, it is possible to increase system capacity by minimizing waste of communication resources in a wireless communication system that is sensitive to latency and frequently transmits a small amount of traffic.

Virtual Circuit Switching, Dedicated channel, Shared channel, Communication resource, Dedicated channel, Shared channel

Description

METHODO AND APPARATUS FOR ALLOCATING COMMUNICATION RESOURCES USING VIRTUAL CIRCUIT SWITCHING IN A WIRELESS COMMUNICATION SYSTEM AND METHOD FOR TRANSMITTING / RECEIVING DATA IN A MOBILE STATION }

1 is a flowchart illustrating a data transmission process using a conventional circuit switched (CS) method.

2 is a flowchart illustrating a data transmission process using a conventional packet switched (PS) method.

3 illustrates a process of transmitting voice traffic in a general VoIP service.

4 is a flowchart illustrating a communication resource allocation method using a virtual circuit switched (VCS) scheme according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating an example in which a base station allocates resources of a dedicated channel to two users in FIG. 4.

6 is a diagram illustrating a process of allocating a resource of a dedicated channel as a resource of a shared channel according to an embodiment of the present invention.

7 is a flowchart illustrating a communication resource allocation method using a virtual circuit switched (VCS) scheme according to another embodiment of the present invention.

8 is a flowchart illustrating a receiving method of a terminal using a virtual circuit switched (VCS) scheme according to an embodiment of the present invention.

9 is a block diagram showing the configuration of a base station transmitter according to an embodiment of the present invention.

10 is a block diagram showing the configuration of a terminal receiver according to an embodiment of the present invention.

The present invention relates to a method and apparatus for allocating communication resources in a wireless communication system, and more particularly, to a method and apparatus for allocating and operating communication resources in a wireless communication system using a circuit switched scheme and a packet switched scheme. It relates to a data transmission and reception method of the terminal.

In general, a communication resource allocation method used in a wireless communication system is largely classified into two methods, a circuit switching (CS) method and a packet switching (PS) method. First, the CS scheme refers to a communication method in which a fixed amount of radio resources, that is, a dedicated channel is allocated to a specific user and data is transmitted and received using the dedicated channel.

1 is a flowchart illustrating a data transmission process using a conventional circuit switched (CS) scheme. In FIG. 1, a conventional CS scheme will be briefly described as an example of a base station transmitter performing dedicated channel allocation.

In step 101 of FIG. 1, the base station transmitter allocates a dedicated channel by performing scheduling for allocating communication resources to a specific user connected through a wireless network. As a representative example of step 101, a specific Walsh code for channel division may be allocated to a specific user in a wireless communication system using a code division multiple access (CDMA) scheme. In another example, in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, a specific sub-carrier resource is allocated to a specific user.

Typically, a process of allocating a specific Walsh code or subcarrier resource to a specific user for allocating a dedicated channel occurs during call setup or hand-off. In FIG. 1, operations 103 through 107 illustrate a process in which data is transmitted through an allocated dedicated channel while a call of a specific user is connected. That is, in step 103, the base station transmitter determines whether there is data to be transmitted to a user (hereinafter, referred to as a CS user) connected in a CS scheme to which a dedicated channel is allocated in step 101 in the corresponding transmission period. Herein, the transmission interval means a transmission time interval (TTI) or a frame in units of time in which one packet data is transmitted.

In step 105, if there is data to be transmitted to the corresponding CS user in the transmission section, the base station transmitter transmits data through a dedicated channel allocated to the CS user in step 105. Whether there is no data to be transmitted to the CS user in this transmission section in step 103 or if the base station transmitter that has transmitted data through the transmission channel according to step 105 moves to the next transmission section and whether there is data to be transmitted to the corresponding CS user. Determine again and repeat the process until the call ends. It should be noted that in the process of allocating communication resources according to the CS scheme of FIG. 1, a dedicated channel allocated to a specific CS user may not be reassigned to another user in the same transmission interval when there is no data to transmit to the CS user in the corresponding transmission interval. Is the point.

FIG. 2 is a flowchart illustrating a data transmission process using a conventional packet switched (PS) scheme. In FIG. 2, a conventional PS scheme is briefly described as an example of a base station transmitter performing shared channel allocation.

Unlike the CS method, the PS method is characterized by sharing system resources (for example, Walsh codes in a CDMA system and subcarriers in an OFDMA system) instead of allocating a dedicated channel to a specific user. That is, the wireless communication system using the PS scheme schedules and uses which user to allocate system resources to every transmission time point. Accordingly, in step 201 of FIG. 2, the base station transmitter allocates a shared channel to the corresponding user by performing scheduling to determine which user to transmit data in this transmission period through an internal scheduler (not shown). As a result of the scheduling, a user to which a shared channel is allocated may have a plurality of users simultaneously scheduled.

In addition, in the scheduling of step 201, the amount of data transmission for each user and the amount of communication resources required for data transmission are determined. In step 202, the base station transmitter transmits data using the shared channel allocated to the user according to the scheduling result, as well as the shared channel for receiving the shared channel using the shared control channel (hereinafter, referred to as SCCH). Send control information. The shared channel information generally includes a user ID, resource information, data rate, modulation information, coding information, and the like.

The user ID is assigned to a user during a call setup process or a handoff process, and the terminal detects the user ID from the shared control channel, and when a plurality of users simultaneously receive the shared channel, data is transmitted to the user in the corresponding transmission interval. Can be confirmed. The resource information represents information of a communication resource used for data transmission, and the data rate information represents data rate information of data transmitted in each transmission interval. The modulation information indicates a modulation scheme used for data transmission, such as QPSK, 8PSK, and 16QAM. In addition, the coding information indicates a coding method and code rate information used in the transmission process.

Meanwhile, in step 203, the base station transmitter that has transmitted data and control information through the shared control channel and the shared channel repeats the operations after step 201 until the call ends using the next transmission interval in step 205.

Each of the above-described CS or PS methods has the following advantages and disadvantages.

First, the CS method allocates a dedicated channel and transmits data through it, which can greatly reduce the control information on the transmitted data.However, if there is no data to be transmitted to the user assigned to the dedicated channel, the resources of the dedicated channel are recycled to other users. Because it cannot be done, the efficiency of communication resource utilization is inferior. The PS method can select a user with a good wireless channel environment and schedule the allocation of the wireless channel to maximize channel-dependent scheduling gain, thereby improving throughput of the wireless communication system in which available communication resources are limited, but using a shared channel. This has the disadvantage that a significant amount of control information must be transmitted with the data each time. In addition, in the case of the CS scheme, it is difficult to expect a channel dependent scheduling gain guaranteed in the PS scheme.

On the other hand, an example of a communication service to which the CS method or the PS method may be applied may be a Voice over Internet Protocol (VoIP) service proposed to provide a voice service through an IP network. The VoIP service is capable of providing high quality voice calls by overcoming the development of IP networks such as the Internet and 56kbps voice bandwidth of line networks, and providing various application solutions and additional services in addition to the low cost of using international calls only with Internet fees. By its advantage, its users are growing rapidly.

3 illustrates a process of transmitting voice traffic in a general VoIP service.

In FIG. 3, reference numeral 301 denotes an output of a vocoder for encoding an analog voice signal into a digital voice signal. As shown in FIG. 3, one of the characteristics of voice traffic is that the output of the vocoder is output in a voiced section in which the user speaks. It is divided into On period and Off period depending on whether it is output in silent period. In addition, since the normal voice traffic is continuously generated with a small period of data (for example, 20 ms), when the VoIP traffic reaches the base station through the IP network, the received signal is a VoIP packet as indicated by reference numeral 302. Have different IP network delay time and thus have irregular characteristics.

For the transmission of the VoIP packet having the above characteristics, the present invention uses the CS method or the PS method as described above, but the system for transmitting the VoIP packet in the CS method communicates during an off period as shown in 301 of FIG. As waste of resources increases, efficient management of communication resources is difficult. On the other hand, the system for transmitting the VoIP packet in the PS method transmits the VoIP packet having a small amount of data in a short period, and thus has irregular characteristics as shown in 302 of FIG. 3, so that control information for packet reception must be transmitted every time. have.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for allocating a communication resource using a virtual circuit method that can efficiently perform communication resource allocation and operation in a wireless communication system using a circuit switched method and a packet switched method.

Another object of the present invention is to provide a method and apparatus for allocating a communication resource using a virtual circuit method that can minimize the waste of communication resources in a wireless communication system that frequently transmits traffic having a small capacity with a delay time.

Still another object of the present invention is to provide a data transmission / reception method of a terminal using a virtual line method that can efficiently perform communication resource allocation and operation in a wireless communication system using a circuit switched method and a packet switched method.

In the wireless communication system of the present invention for achieving the above object, a communication resource allocation method for transmitting data to a plurality of user terminals includes a process of allocating a dedicated channel to a specific user terminal and data to be transmitted to the specific user terminal. Checking whether the data is to be transmitted to the specific user terminal, allocating a resource of the dedicated channel as a resource of a shared channel, and transmitting data to another user terminal using the shared channel. Characterized by including the process.

In addition, the base station apparatus for transmitting data to a plurality of user terminals in the wireless communication system of the present invention for achieving the above object is a data buffer for temporarily storing user-specific data to be transmitted to the plurality of user terminals, and the plurality of users A resource allocator for allocating a dedicated channel to the terminal and allocating a dedicated channel resource of the specific user terminal as a shared channel resource of another user terminal when there is no data to be transmitted to the specific user terminal, and the scheduling result The transmitter comprises a transmitter for transmitting user-specific data output from the data buffer to an assigned wireless channel of each user according to a predetermined transmission interval.

In addition, the data receiving method of the user terminal in the wireless communication system of the present invention for achieving the above object is a process of receiving a dedicated channel for receiving the data from the base station, and monitors the shared control channel to control information for receiving the data And receiving data transmitted through the dedicated channel and receiving data from the shared channel when it is determined that the own data is transmitted through the shared channel as a result of receiving the control information. It is characterized by.

In addition, the terminal apparatus for receiving data from the base station in the wireless communication system of the present invention for achieving the above object is a control channel demodulator for demodulating the downlink signal to receive control information associated with the shared channel, demodulating the received signal from the wireless channel A data channel demodulator for outputting packet data and controlling reception of a dedicated channel as well as receiving a signal of a shared channel among the wireless channels when it is determined that its data is transmitted through the shared channel as a result of receiving the control information. And a data demodulation controller for controlling the data channel demodulator to demodulate the signal.

In addition, the data transmission method of the user terminal in the wireless communication system of the present invention for achieving the above object, the process of receiving a dedicated channel for the data transmission from the base station, and monitors a shared control channel to control information for the data transmission A process of receiving, determining whether a resource of the dedicated channel is allocated to another user terminal through the control information; and checking whether the resource allocation to the other user terminal is a fixed resource allocation to the fixed channel allocation. And performing the data transmission through the remaining resources except for the fixed resource allocation in the resources of.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the present invention will be described, it should be noted that the description of other parts will be omitted so as not to distract from the gist of the present invention.

First, prior to the description of the present invention, the terms defined in the present invention and the basic concepts of the present invention will be briefly described.

Referring to the basic method of allocating communication resources in the present invention, in using the CS method for allocating a dedicated channel and the PS method for allocating a shared channel, after allocating a dedicated channel to a specific user in a normal CS method, If there is data to be transmitted to the user, the user's data is transmitted using the assigned channel. If there is no data to be transmitted to the user in the transmission section, the communication resource allocated to the corresponding channel is converted into a shared channel resource of the PS method and used for data transmission by another user. Using the above-described communication resource allocation scheme, the efficiency of use of communication resources can be improved by reassigning communication resources of a dedicated channel to shared channel resources in a transmission section in which there is no data transmission.

Hereinafter, in the present specification, the above-described communication resource allocation method of the present invention is defined as a virtual circuit switching (VCS) method, and the traffic of a small capacity is frequently transmitted by defining a transmission point of an initial transport packet in the VCS method. In this case, various embodiments of reducing a transmission amount of control information or transmitting and receiving a dedicated channel and / or a shared channel according to the VCS scheme will be described.

4 is a flowchart illustrating a communication resource allocation method using a virtual circuit switched (VCS) scheme according to an embodiment of the present invention, and FIG. 4 is an example of allocating and operating communication resources in a VCS scheme at a base station transmitter.

In step 401 of FIG. 4, the base station transmitter allocates a dedicated channel by performing scheduling for allocating communication resources to a specific user connected through a wireless network. Examples of the dedicated channel allocation include allocating a specific Walsh code to a specific user in a CDMA system and allocating a specific subcarrier resource to a specific user in an OFDMA system. Typically, a process of allocating a specific Walsh code or subcarrier resource to a specific user for allocating a dedicated channel occurs during call setup or hand-off.

FIG. 5 illustrates an example in which the base station allocates resources of a dedicated channel to two users in step 401 of FIG. 4. In FIG. 5, the horizontal axis represents time and the vertical axis represents communication resources. In a CDMA system, the communication resource represents a Walsh code, and in an OFDMA system, the communication resource represents a subcarrier. The shaded portion of the top of FIG. 5 represents communication resources allocated exclusively to user A, and the shaded portion of the bottom of FIG. 5 represents communication resources allocated exclusively to user B. In FIG. In addition, the area between each shaded area represents a communication resource to which a shared channel is allocated, not a dedicated channel.

In step 403 of FIG. 4, the base station transmitter determines whether there is data to be transmitted to a CS user assigned a dedicated channel in this transmission interval. Herein, the transmission interval may mean a TTI or a frame as a time unit in which one packet data is transmitted or may be another identifier for distinguishing a time unit in which data is transmitted in a communication system. If there is no data to be transmitted to the CS user in this transmission period in step 403, the base station transmitter converts the resource of the dedicated channel allocated to the CS user into the resource of the shared channel during the transmission period, and uses the shared channel for another. Send the PS user's data. In this case, control information for data demodulation of the shared channel may be transmitted through the shared control channel together with data transmission through the shared channel. However, if the receiver already knows the control information, the control information may not need to be transmitted.

In step 403, if there is data to be transmitted to the corresponding CS user in this transmission section, the base station transmitter determines whether the data packet to be transmitted is the initial transmission packet in step 407, and if it is not the initial transmission packet, in the conventional CS scheme. Data is transmitted using the allocated dedicated channel as shown in FIG. On the other hand, when the data packet to be transmitted is identified as the initial transport packet in step 407, the base station transmitter transmits data using the dedicated channel allocated at the start of the frame boundary. Subsequently, the base station transmitter that has transmitted data through the dedicated channel according to step 409 or 411 moves to the next transmission section to re-determine whether there is data to transmit to the corresponding CS user, and repeats the following process until the call ends. do.

Hereinafter, the operations of steps 407 and 411 will be described in more detail with reference to FIG. 5. First, when allocating resources of a dedicated channel in the present invention, as shown in reference numerals 501 and 502 of FIG. 5, a unique frame boundary is set for each user. The reason for defining the user's own frame boundary is to restrict the initial transmission packet to be transmitted only at the start of the frame boundary in a system that supports hybrid automatic repeat request (HARQ). In a system supporting HARQ, one encoder packet is transmitted several times such as initial transmission, first retransmission, second retransmission, ..., and so on. Here, each transmission is referred to as a sub-packet transmission. In the base station transmitter, an identifier for each retransmission, that is, a sub packet identifier is used to inform the receiver of the terminal of the number of transmissions of each sub packet. To send.

Therefore, in the present invention, the reason for defining a unique frame boundary for each user as described above is to minimize the amount of control information by allowing initial transmission to be performed at the starting point of the frame boundary of the user when transmitting a subpacket for each user. . For reference, the limitation of defining the user's own frame boundary for the general packet and initial transmission only at the frame boundary start point may increase the delay time of the packet, which may adversely affect the small capacity such as VoIP traffic. In the case of transmitting a packet in a short cycle, the effect of the present invention can be expected to reduce the amount of control information.

In addition, in the embodiment of FIG. 4, resources of a dedicated channel may be allocated at equal intervals in consideration of a physical layer ACK / NACK response time from a UE in the HARQ operation process as shown by reference numeral 503 of FIG. 5. 4 is basically characterized in that when there is no data to be transmitted to the CS user, the resources of the dedicated channel allocated to the corresponding transmission interval are converted to the resources of the shared channel and used for data transmission of another PS user. . Initiating initial transmission at the frame boundary as in steps 407 and 411 is to reduce the amount of transmission of control information, especially when the communication system supports HARQ, and the operations in steps 407 and 411 may be selectively performed. something to do.

6 is a diagram illustrating a process of allocating a resource of a dedicated channel as a resource of a shared channel according to an embodiment of the present invention.

In FIG. 6, the horizontal axis represents time and the vertical axis represents communication resources. In a CDMA system, the communication resource represents a Walsh code, and in an OFDMA system, the communication resource represents a subcarrier. The shaded portion of FIG. 6 shows the portion of the resource of the dedicated channel allocated to user A, in which data is actually transmitted to user A, and the shaded portion of the lower portion of FIG. 6 represents the dedicated portion assigned to user B. It shows the portion of the channel's resources where data is actually sent to user B. In addition, the area between each shaded area represents a communication resource to which a shared channel is allocated, not a dedicated channel.

In FIG. 6, reference numeral 601 denotes a unique frame boundary for User A, similarly to the portion indicated by Reference numeral 501 in FIG. 5, and reference numeral 602 indicates that User A's dedicated channel resource is assigned to User A in the corresponding transmission interval. FIG. 4 shows the state allocated as a resource of a shared channel for use by another user because there is no data to transmit. This corresponds to operation 405 of FIG. 4.

In FIG. 6, reference numeral 603 denotes a frame boundary unique to User B as in the portion indicated by reference numeral 502 in FIG. 5, and reference numeral 605 denotes data to be transmitted by User B's dedicated channel resource to User B in a corresponding transmission interval. Shows a different state allocated as a resource of a shared channel for use by another user due to the nonexistence, which means that the initial transmission is started at the starting point of the frame boundary of user B, and the packet that was being transmitted to user B is terminal in the second transmission. This is the case when the ACK response is received from the network and no longer needs to be retransmitted.

7 is a flowchart illustrating a communication resource allocation method using a virtual circuit switched (VCS) method according to another embodiment of the present invention, which further illustrates an embodiment of additionally using a shared channel resource according to the amount of data of a user to be transmitted.

In step 701 of FIG. 7, the base station transmitter allocates a dedicated channel by performing scheduling for allocating communication resources to a specific user connected through a wireless network. Since the specific allocation example of the dedicated channel is the same as that of the embodiment of FIG. 4, a detailed description thereof will be omitted.

Subsequently, in step 703, the base station transmitter determines whether the amount of data to be transmitted to the user who allocated the dedicated channel in the previous transmission interval is equal to or smaller than the capacity of the allocated dedicated channel. Data using the dedicated dedicated channel. On the other hand, if the amount of data to be transmitted to the user assigned to the dedicated channel in step 703 is greater than the capacity of the allocated dedicated channel, the base station transmitter allocates additional shared channel resources to the corresponding user in step 707, and then pre-allocates it in step 709. The user's data is transmitted using both the dedicated channel and the shared channel allocated in step 707. In this process, although not shown in FIG. 7, since the shared channel is used, control information is also transmitted through the shared control channel as in the conventional PS scheme.

Meanwhile, as in the embodiment of FIG. 7, it should be noted that not all users can use a dedicated channel and a shared channel together. That is, a user terminal capable of using both a dedicated channel and a shared channel must continuously monitor the shared control channel during the call connection to check whether or not its data is transmitted through the shared channel. In step 701, a dedicated channel is assigned. In step 705 or 709, the base station transmitter that has transmitted data through the dedicated channel and / or the shared channel determines whether there is data to transmit to the corresponding user by moving to the next transmission interval, and repeats the subsequent process until the call ends. Do it.

Hereinafter, a reception method of a user terminal using the VCS scheme of the present invention will be described with reference to FIG. 8.

8 is a flowchart illustrating a receiving method of a terminal using a virtual circuit switched (VCS) scheme according to an embodiment of the present invention.

In step 801 of FIG. 8, the user terminal is allocated a dedicated channel from the base station. At this time, the base station transmits a message indicating whether to support the shared channel to the user terminal in the channel allocation process. Meanwhile, if a shared channel is supported between the terminal and the base station, and if the shared channel is supported to the user terminal in advance, the base station transmits a message indicating whether the shared channel is supported in step 801. May be omitted. In step 803, the user terminal receives data using an allocated dedicated channel as in the conventional CS method, and continuously monitors the shared control channel according to step 805 to check whether its data is transmitted through the shared channel. do. In FIG. 8, for convenience of description, step 805 for monitoring the shared control channel after step 803 of receiving the dedicated channel is illustrated, but it should be noted that the reception operation of the dedicated channel and the reception operation of the shared channel are performed independently.

Accordingly, the user terminal continuously monitors the shared control channel in step 805 to demodulate the control information. If the user information is included in the control information in step 807, the user terminal determines that the own data is transmitted through the shared channel. On the other hand, when the control information does not include its own user ID, it is determined that there is no own data transmitted through the shared channel. If it is determined in step 807 that the own data is transmitted through the shared channel, the user terminal demodulates the shared channel in the corresponding transmission section in step 809 to receive the own data, and does not exist. When the reception of the shared channel is completed, the user terminal moves to the next transmission section in step 811 and repeats the operations after step 803 until the call ends.

Hereinafter, an apparatus configuration of a base station and a terminal to which the above-described communication resource allocation method and reception method are applied will be described with reference to FIGS. 9 and 10.

FIG. 9 is a block diagram illustrating a configuration of a base station transmitter according to an embodiment of the present invention. The configuration of FIG. 9 illustrates an example of a configuration of a base station transmitter applied to a communication system using an OFDM transmission scheme.

In FIG. 9, the data buffer 901 is temporarily stored in the data received from the upper layer of the communication network to be transmitted to the uplink to each user. According to the amount of data stored in the data buffer 901, the resource allocator 903 schedules data to be transmitted to each user and communication resources of each user to be used for data transmission. The scheduling operation of the resource allocator 903 is performed using the method of FIGS. 4 to 7 described above. The OFDM symbol generator 905 receives the data to be transmitted from the data buffer 901 and generates OFDM symbols to be transmitted under the control of the resource allocator 903. The OFDM symbol generator 905 may include an encoder, an interleaver, a symbol mapper, and the like used in an OFDM system.

The OFDM symbol generated from the OFDM symbol generator 905 is transmitted to the wireless network by inserting a guard interval through the OFDM symbol transmitter 907. The OFDM symbol transmitter 907 transmits user-specific data to a corresponding wireless channel according to a predetermined transmission interval according to the scheduling result of the resource allocator 903. The OFDM symbol transmitter 907 includes a guard interval inserter, an RF stage, an antenna, and the like.

On the other hand, the base station apparatus of FIG. 9 is an example of an OFDM system, but applying the resource allocator 903 to which the method of FIGS. 4 to 7 is applied to a base station apparatus of a general 3G network or a transmitting apparatus of another communication network capable of packet communication It will be apparent to those skilled in the art.

10 is a block diagram illustrating a configuration of a terminal receiver according to an exemplary embodiment of the present invention.

In FIG. 10, the control channel demodulator 1001 demodulates a control channel from a downlink signal through a predetermined process and outputs control information. Here, the control information includes shared channel control information including a user ID, resource information, data rate, modulation information, coding information, and the like when the terminal uses a shared channel. The output of the control channel demodulator 1001 is input to the data demodulation controller 1002. The data demodulation controller 1002 is a dedicated channel and / or shared by the data channel demodulator 1003 as in the reception method of Figs. Control to receive the channel.

The data demodulation controller 1002 controls the data channel demodulator 1003 to demodulate the received signal of the shared channel in a corresponding transmission period when it is determined that the data is transmitted through the shared channel as a result of receiving the control information. . The data channel demodulator 1003 demodulates and outputs a data channel allocated to a dedicated channel or a shared channel under the control of the data demodulation controller 1002. Meanwhile, in FIG. 10, the control channel demodulator 1001 and the data channel demodulator 1003 will be understood to include a decoder.

11 is a flowchart illustrating a transmission method of a terminal using a virtual circuit switched (VCS) method according to an embodiment of the present invention. 11 illustrates the operation of a terminal when the present invention is used for reverse data transmission, it should be noted that the same method can be used for forward data transmission.

Referring to FIG. 11, in step 1101, a terminal is allocated a fixed resource, that is, a dedicated channel, from a base station. In step 1103, the terminal allocated the fixed resource receives and demodulates the shared control channel (data control channel). In step 1105, the terminal checks the shared control information from the demodulated shared control channel and determines whether the fixed resource allocated to the terminal is allocated to another user according to the virtual circuit switched (VCS) of the present invention. If the fixed resource allocated to the user is not allocated to another user in step 1105, the fixed resource allocated to the user is determined to be unchanged and data is transmitted through the fixed resource.

On the contrary, if it is determined in step 1105 that the fixed resource allocated to the user is allocated to another user, the terminal checks the shared control information received through the shared control channel in step 1109 and allocates the fixed resource to another user. Determine if it is. If it is determined in step 1109 that the resource allocation to another user is not a fixed resource allocation, the terminal proceeds to step 1111 and the fixed resources allocated to the terminal are unchanged, but the resources that can be used for data transmission at that time are not changed. After subtracting the resources temporarily allocated to other users from their fixed resources, it identifies the remaining resources and transmits the data through the remaining resources.

In the operation described in step 1107, that is, the terminal temporarily removes a resource from another fixed user from its fixed resource, and then temporarily deprives the user of the resource to another user. It may be a time interval applied or defined through the shared control channel or a predetermined amount of time between the base station and the terminal in advance. In addition, the time interval may be a frame boundary section unique to the terminal indicated by reference numeral 603 of FIG. 6 to the start point of the next boundary.

Meanwhile, if it is determined in step 1109 that the resource allocation to another user is fixed resource allocation, the terminal recognizes that the fixed resource allocated to the user is changed. That is, after subtracting a resource allocated as a fixed resource to another user among the fixed resources currently allocated to the user, the remaining resource is determined as a new fixed resource allocated to the user. The data is transmitted through the new fixed resource. In this case, it should be noted that the new fixed resource is continuously applied after the change of the resource. The terminal repeats the operation after step 1103 from the next time interval (or slot).

The configuration of the terminal transmitter to which the transmission method of FIG. 11 is applied may be simply implemented using the terminal receiver configuration described with reference to FIG. 10. For example, the control channel demodulator 1001 is maintained as it is, and provided with a data modulation controller and a data channel modulator to correspond to the data demodulation controller 1003 and the data channel demodulator 1005, respectively, of the terminal transmitter according to the present invention. Configuration may be possible.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the appended claims, but also by the equivalents of the claims.

As described above, according to the present invention, it is possible to provide a communication resource allocation method using a virtual circuit method that can efficiently perform communication resource allocation and operation by performing parallel resource allocation in a circuit switched method and a packet switched method. have.

In addition, according to the present invention, it is possible to increase system capacity by minimizing waste of communication resources in a wireless communication system that is sensitive to delay time and frequently transmits a small amount of traffic.

Claims (19)

A communication resource allocation method for transmitting data to a plurality of user terminals in a wireless communication system, Allocating a dedicated channel to a specific user terminal; Checking whether there is data to be transmitted to the specific user terminal; Allocating resources of the dedicated channel as resources of a shared channel when there is no data to be transmitted to the specific user terminal; And transmitting data to another user terminal using the shared channel. The method of claim 1, And transmitting data using the dedicated channel when there is data to be transmitted to the specific user terminal. The method of claim 1, When there is data to be transmitted to the specific user terminal, checking whether the data is an initial transport packet; And transmitting data using the dedicated channel at a frame boundary start point of the specific user when the data to be transmitted is identified as the initial transport packet. The method of claim 3, wherein The wireless communication system supports a hybrid automatic repeat request (HARQ) characterized in that the communication resource allocation method. The method of claim 1, The resource of the dedicated channel is allocated to a communication resource, characterized in that assigned to a certain period. The method of claim 1, And the data is a Voice over Internet Protocol (VoIP) packet. A communication resource allocation method for transmitting data to a plurality of user terminals in a wireless communication system, Allocating a dedicated channel to a specific user terminal; And allocating a shared channel to the specific user terminal when the amount of data to be transmitted to the specific user terminal is larger than the capacity of the allocated dedicated channel. The method of claim 7, wherein The shared channel is allocated to the communication resource using a communication resource of another user that does not have data to be transmitted in the transmission interval. The method of claim 7, wherein The allocating of the dedicated channel may further include transmitting a message indicating whether the shared channel is supported to the specific user terminal. The method of claim 7, wherein And transmitting data using only the dedicated channel when the amount of data to be transmitted to the specific user terminal is less than or equal to the capacity of the allocated dedicated channel. A base station apparatus for transmitting data to a plurality of user terminals in a wireless communication system, A data buffer for temporarily storing user-specific data to be transmitted to the plurality of user terminals; A resource allocator configured to allocate dedicated channels to the plurality of user terminals and to allocate dedicated channel resources of the specific user terminal as shared channel resources of another user terminal when there is no data to be transmitted to the specific user terminal; , And a transmitter for transmitting user-specific data output from the data buffer according to the scheduling result to an allocated wireless channel of each user according to a predetermined transmission interval. The method of claim 11, And the resource allocator is configured to further allocate a shared channel to the specific user terminal when the amount of data to be transmitted to the specific user terminal is greater than the capacity of the allocated dedicated channel. The method according to claim 11 or 12, And the resource allocator is further configured to transmit a message indicating whether the shared channel is supported to the specific user terminal through the transmitter. The method of claim 11, The resource allocator is further configured to schedule transmission of data using a dedicated channel at the starting point of the frame boundary of the specific user when there is data to be transmitted to the specific user terminal and the corresponding data is identified as an initial transport packet. Device. The method of claim 12, The wireless communication system supports a HARQ (Hybrid Automatic repeat request). In the method of receiving data of a user terminal in a wireless communication system, Receiving a dedicated channel for receiving the data from a base station; Receiving control information for receiving the data by monitoring a shared control channel; Receiving data transmitted through the dedicated channel and receiving data from the shared channel when it is determined that the own data is transmitted through the shared channel as a result of receiving the control information. Method of receiving data of the terminal. The method of claim 16, And receiving a message indicating whether the shared channel is supported from the base station. A terminal device for receiving data from a base station in a wireless communication system, A control channel demodulator for demodulating a downlink signal to receive control information related to a shared channel; A data channel demodulator for demodulating a received signal from a wireless channel and outputting packet data; Data for controlling the data channel demodulator to demodulate the received signal of the shared channel among the wireless channels when it is determined that the data is transmitted through the shared channel as well as the reception of the dedicated channel. Terminal device comprising a demodulation controller. In the data transmission method of the user terminal in a wireless communication system, Receiving a dedicated channel for transmitting the data from a base station; Receiving a control information for transmitting the data by monitoring a shared control channel; Checking whether the resource of the dedicated channel is allocated to another user terminal through the control information; Determining whether the resource allocation to the other user terminal is a fixed resource allocation, and when the fixed resource allocation is performed, performing the data transmission through the remaining resources except for the fixed resource allocation from the resources of the dedicated channel. Data transmission method of the user terminal.

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