Method for scheduling radio resources in mobile communication system

Method for scheduling radio resources in mobile communication system

The present invention is directed to a mobile communication system, and particularly to a method for scheduling radio resources in a mobile communication system.

Figure 1 is a structural diagram illustrating a "Long Term Evolution (LTE)" system belonging to a mobile communication system. The LTE system is an evolved version of the traditional UMTS system and has been standardized by the 3GPP (3rd Generation Partnership Project).

The LTE can be roughly classified into an "Evolved UMTS Terrestrial Radio Access Network (E-UTRAN)" and a "Core Network (CN)". The E-UTRAN contains at least one eNode-B as a base station, and an "access gateway (AG)" connected to an external network at the end of the network.

The AG can be divided into a part handling user traffic and a part handling control traffic. A first AG handling user traffic can communicate with a second AG handling control traffic through a new interface. A single eNode-B may contain at least one cell.

A first interface for transmitting user traffic or a second interface for transmitting control traffic can be located between multiple eNode-Bs. The CN contains the AG and a plurality of nodes for registering users of "User Equipment (UE)". If necessary, another interface for distinguishing the E-UTRAN and the CN can also be applied to the LTE network.

Figure 2 is a conceptual diagram, which illustrates a control plane based on the 3GPP radio access network standard and located in the radio interface protocol structure between the UE and the UTRAN ("UMTS Terrestrial Radio Access Network"). The radio interface protocol includes a physical layer, a data layer and a network layer in the horizontal direction. The radio interface protocol contains a "user plane" for transmitting data and a "control plane" for transmitting a control signal in the vertical direction.

The protocol layers shown in Figure 2 can be divided into the first layer (L1) and the second layer ( L2) and the third layer (L3).

As the first layer (L1), the physical layer can provide "information transmission service" on a physical channel. A radio resource control (RRC) layer located at the third layer (L3) controls the radio resources between the UE and the network.

The RRC layer can exchange RRC messages between the UE and the network for this project. The RRC layer can be spread to multiple network nodes such as eNode-B and AG, and can also be located at the eNode-B or the AG.

The following will refer to Figure 2 to describe a radio protocol control plane. The radio protocol control plane includes a physical layer, a "media access control (MAC)" layer, a "radio link control (RLC)" layer, and a "radio resource control (RRC)" layer.

When the physical layer is used as the first layer (L1), an "information delivery service" can be transmitted to an upper layer through a physical channel. The physical layer is connected to a "Media Access Control (MAC)" layer located on it through a transmission channel.

The MAC layer communicates with the physical layer through the transmission channel, thereby enabling data transmission between the MAC layer and the physical layer. Data is transmitted between separate different physical layers, such as between a first physical layer on a transmitting side and a second physical layer on a receiving side.

The MAC layer of the second layer (L2) provides services to the RLC ("Radio Service Control") layer located on it through a logical channel. The RLC layer of the second layer (L2) supports reliable data transmission. It should be noted that the RLC layer is described by a dotted line, because if the function of the RLC layer is implemented and executed by the MAC layer, the RLC layer itself may not need to exist.

The RRC ("Radio Resource Control") layer located at the lowest part of the third layer (L3) is only defined in the control plane. The RRC layer handles control matters related to the logical channels, transmission channels, and physical channels of "Radio Bearer (RB)" configuration, reconfiguration, and release operations. An RB refers to a service provided by the second layer (L2) for data transmission between the terminal and the UTRAN.

Figure 3 is a conceptual diagram, which illustrates a user plane based on the 3GPP radio access network standard in the radio interface protocol structure between the UE and the UTRAN. The radio protocol user plane includes the physical layer, the MAC layer, the RLC layer, and the PDCP layer.

The physical layer of the first layer (L1), and the MAC and RLC layers of the second layer (L2) are the same as those described in Figure 2. The PDCP layer of the second layer (L2) performs header compression to reduce the size of a very large IP packet header containing unnecessary control information, thereby effectively reducing the size of a radio communication period with a narrow bandwidth Send IP packets like IPv4 or IPv6.

In the following, it will be described in detail as the uplink link and the downlink link for data transmission between the network and the UE. The downlink channel is used to transmit data from the network to the UE. The uplink channel transmits data from the UE to the network.

Examples of downlink channels are the "Broadcast Channel (BCH)" used to transmit system information, and the downlink "Shared Channel (SCH)" and "Shared Control Channel ( SCCH)". The downlink shared channel (SCH) can be used to transmit user traffic or control messages of the downlink multicast service or broadcast service, or it can be transmitted via an additional multicast channel (MCH).

Examples of uplink channels are the "Random Access Channel (RACH)", and the uplink shared channel (SCH) and shared control channel (SCCH) used to transmit user traffic or control messages.

The following will explain in detail the orthogonal frequency division multiplexing (OFDM) law used in the physical layer belonging to the first layer. The OFDM law can divide a high-speed data stream into multiple low-speed data streams, and transmit the low-speed data streams simultaneously through multiple carriers. Here, each of the plurality of carriers is a sub-carrier.

The OFDM law has orthogonality between multiple sub-carriers. Therefore, even if the frequency components of the sub-carriers overlap each other, the frequency components of the sub-carriers can still be detected at the receiving side.

A serial/parallel converter, which is also called a "serial-to-parallel converter", can convert the high-speed data stream into multiple low-speed data streams. Each of the subcarriers is multiplied by the parallel data stream generated by the serial/parallel converter, and the obtained data streams are added up, and the sum of the data streams is transmitted to the receiving side.

According to an "Inverse Discrete Fourier Transform (IDFT)" law, the parallel data stream generated by the serial/parallel converter can be transmitted to a destination through a plurality of subcarriers. The IDFT can be effectively implemented by an "Inverse Fast Fourier Transform (IFFT)" law.

The time signal scatter generated by the multipath delay spreading, such as the relative signal scatter in time, will decrease as the symbol period length of the low spreading subcarrier increases. A guard interval longer than the channel delay dispersion interval is inserted between many OFDM symbols, so that inter-symbol interference can be reduced. If the OFDM symbols can be extended cyclically, the duplicate entries of some parts of the OFDM symbols can be arranged at the guard interval to protect the symbols.

A traditional "Orthogonal Frequency Division Multiple Access (OFDMA)" rule will be explained in detail below. The OFDMA law transmits some sub-carrier parts that can be used by a system based on the OFDM modulation operation to individual users, and can implement a multiple access function for these users.

The OFDMA law transmits frequency resources called subcarriers to these users. These frequency resources are transmitted to the users in a mutually independent manner so that they do not overlap with each other. Therefore, the frequency resources are allocated to these users in an exclusive manner, without overlapping.

Figure 4 is a block diagram, which illustrates a transmitter based on the "Discrete Fourier Transform Single-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM)" rule, which is called a "DFT-S-OFDM transmission" below. Device". The following will refer to Figure 4 to illustrate a traditional DFT-S-OFDM law.

For ease of explanation, a plurality of variables will be defined. The variable "N" represents the number of subcarriers on which the OFDM signal is transmitted. The variable "Nb" represents the number of subcarriers for a specific user. The variable "F" represents a "discrete Fourier transform (DFT)" matrix. The variable "s" represents a data-symbol vector. The variable "x" represents a vector generated by interspersing data in a frequency domain. The variable "y" represents an OFDM-symbol vector.

A "Single Carrier-Frequency Division Multiple Access (SC-FDMA)" system uses the serial/parallel converter 410 to convert data symbol(s) into a parallel signal, which is then transmitted by the DFT interspersed module 420 ( Before multiple) data symbols, first use a DFT matrix to perform (multiple) data symbol scatter operations. The interspersing operation of data symbols can be expressed as Equation 1: [Equation 1]<i>x</i>＝<i>F</i>_{<i>Nb×Nb</i>}<i>s</i>

Referring to Equation 1, the F_<i>Nb</i>_x_<i>Nb</i>Represents a DFT matrix with a size of Nb used for data symbol scatter operations. The subcarrier mapping unit 430 can use a specific subcarrier configuration technique to perform the subcarrier mapping process of the interspersed vector (x).

The IFDT module 440 receives the mapped signal from the sub-carrier mapping unit 430, and converts the received signal into a time domain signal through the parallel/sequence converter 450, thereby generating a signal received at the receiving side Target signal. The target signal transmitted to the receiving side can be expressed as Equation 2:<maths><img file="TW200746754A_D0001.tif" /></maths>

Referring to Equation 2, the<img file="TW200746754A_D0002.tif" />Represents an IDFT matrix that has a size of N and is necessary for converting a frequency domain into a time domain signal. The cyclic prefix insertion unit 460 inserts a cyclic prefix into the OFDM-symbol vector (y), so that the obtained "y" signal containing the cyclic prefix can be transmitted to a destination.

A method for generating a transmission signal and transmitting the signal to the receiving side according to the above-mentioned law is called the SC-FDMA method. The size of the DFT matrix can be controlled in various ways to achieve a specific purpose.

Figure 5 is a conceptual diagram illustrating a hybrid ARQ (HARQ) rule. Now, referring to Fig. 5, a method for implementing HARQ in the underlying link physical layer of a radio packet communication system will be explained.

Referring now to Figure 5, the eNode-B determines a UE to receive a packet, and packet type information to be transmitted to the UE, such as coding rate, modulation rule, and data volume. The eNode-B notifies the UE through an HS-SCCH ("High Speed Downlink Shared Control Channel") to explain the determined information, and through the HS-SCCH, transmits a phase at the time related to the information transmission operation Corresponding data packet (HS-DSCH).

The UE receives the information of the packet on the HS-SCCH. Then, the UE recognizes the type and transmission point of the packet, and receives the corresponding packet.

If the UE cannot decode a specific packet, such as data1, the UE transmits a negative acknowledgement (NACK) signal to the eNode-B. The eNode-B recognizes that the packet transmission operation failed, and uses the same packet format or a new packet format to retransmit the same packet like data1 at an appropriate point in time. The UE merges the retransmitted packet like the data1 with a previously received packet that failed to decode the packet, and re-attempts to decode the packet.

If the packet is received and successfully decoded, the UE sends an acknowledgment (ACK) signal to the eNode-B. The eNode-B recognizes the successful packet transmission operation, and executes the next packet transmission operation like data2.

Some radio resources are configured according to higher-level scheduling processing, so that multiple eNode-Bs can use a mobile communication system to communicate with multiple UEs through limited radio resources. This scheduling process is usually performed by the eNode-B(s), and the configured radio resources can be used to communicate with multiple UEs.

The eNode-B can allocate radio resources to the UE when receiving a request from the UE. In the absence of a request from the UE, if radio resources need to be allocated to the UE, the eNode-B can also allocate radio resources to the UE. If it is necessary to pre-configure radio resources to the UE, the radio resources can also be configured to the UE.

The UEs use the preset radio resources configured by the eNode-B to transmit data or control signals. These radio resources configured by the eNode-B in an uplink transmission operation are preset for a specific UE.

Therefore, if the specific UEs do not use the radio resources configured by the eNode-B, the radio resources may be wasted unnecessarily.

Therefore, the present invention is directed to a method for scheduling radio resources of a mobile communication system, which roughly alleviates one or more problems caused by the limitations and shortcomings of related technologies. An object of the present invention is to provide a radio resource scheduling method for improving the efficiency of radio resources available to a mobile communication system, thereby helping to communicate more efficiently between the UE and an eNode-B . Another object of the present invention is to provide a radio resource scheduling method for reducing the waste of radio resources. Yet another object of the present invention is to provide a radio resource scheduling method which can be used to utilize a message received by the UE from a UE during an uplink transmission operation, thereby efficiently configuring the radio resource.

In one aspect of the present invention, a method for scheduling radio resources in a mobile communication system is provided. The method includes receiving a representation of a configured radio resource; using the configured radio resource to transmit information; transmitting a radio resource no longer needed, or receiving a representation of the radio resource no longer being configured and no longer using the radio Resources to convey information.

It is considered that the method further includes receiving an indication that the resources are no longer allocated after transmitting the indication that the radio resources are no longer needed. It is further considered that the indication that the resources are no longer allocated includes a message between a second protocol layer and a first protocol layer.

Considering that the transmission of the indication that the radio resources are no longer needed includes transmitting an uplink control signal or a preamble through a random access channel (RACH). It is further considered that the indication that the radio resources are no longer needed includes an indication that there is no remaining data for the transmission operation via an uplink path.

In another aspect of the present invention, a method for scheduling radio resources in a mobile communication system is provided. The method includes allocating radio resources to a first mobile communication terminal, deciding that the allocated radio resources are no longer needed, and reconfiguring the radio resources to a second mobile communication terminal.

Considering that deciding that the configured radio resources are no longer needed includes receiving an indication that the resources are no longer needed. It is further considered that the indication that the radio resources are no longer needed for reception includes receiving an uplink control signal or a preamble through a random access channel (RACH).

Considering that the indication that the radio resources are no longer needed includes an indication that there is no remaining data for transmission operations via an uplink path. Further consideration is to determine that the allocated radio resources are no longer needed, including determining that the first mobile terminal has no additional information to be transmitted.

It is considered that the method further includes transmitting an indication that the resource is no longer allocated to the first mobile communication terminal. It is further considered that the indication that the resources are no longer allocated includes a message between a second protocol layer and a first protocol layer.

In another aspect of the present invention, a method for scheduling radio resources in a mobile communication system is provided. The method includes a network allocating radio resources to a first mobile communication terminal, the first mobile communication terminal uses the configured radio resources to transmit information, and determines that the configured radio resources are no longer needed, and the network will The radio resources are re-allocated to a second mobile communication terminal, and the first mobile communication terminal no longer uses the radio resources to transmit information.

Considering that deciding that the allocated radio resources are no longer needed includes the first mobile communication terminal transmitting an indication that the resources are no longer needed. It is further considered that the first mobile communication terminal transmits an indication that the radio resources are no longer needed in an uplink control signal or a preamble through a random access channel (RACH).

It is considered that the method further includes that the network transmits an indication that resources are no longer allocated to the first mobile communication terminal. It is further considered that the indication that the resources are no longer allocated includes a message between a second protocol layer and a first protocol layer.

Considering that it is determined that the allocated radio resources are no longer needed, the network determines that the first mobile terminal has no additional information to be transmitted. It is further considered that the method further includes that the network transmits an indication that resources are no longer allocated to the first mobile communication terminal. Preferably, the indication that the resources are no longer allocated includes a message between a second protocol layer and a first protocol layer.

Other aspects and advantages of the present invention will be partly in the following description and partly obvious from the description, or can be stated in a manner known to implement the present invention. It should be understood that both the general description of the previous disclosure and the detailed description of the latter are only exemplary and explanatory, and are intended to provide further explanation of the present invention.

For those who are familiar with this technique, the specific embodiments will be described in detail and refer to the accompanying drawings. These and other specific embodiments will also be obvious, but the present invention is not limited to any disclosed Specific embodiments.

Now, reference will be made in detail to various preferred embodiments of the present invention, and these examples are described in the accompanying drawings. The same reference numbers will be used as much as possible in the drawings throughout the text to refer to the same or similar parts. Hereinafter, referring to the accompanying drawings, a method for scheduling radio resources of a mobile communication system according to the present invention will be described.

For the convenience of description and a better understanding of the present invention, "terminal" refers to a transmitter of an uplink signal, and "base station" is used as a receiver of the uplink signal. However, it should be noted that the scope of the "terminal" and the "base station" is not limited to the above vocabulary, and the "terminal" and the "base station" can also be used to refer to a UE and Node-B or eNode-B respectively .

The following preferred embodiments of the present invention are implemented when the present invention is applied to an OFDM-type LTE system. When the eNode-B performs the scheduling process of the uplink or downlink radio resources from the eNode-B to the UE, the OFDM system is configured with a single resource block (RB), which is determined by a specific sub It is composed of both the frame and the specific sub-carrier. This is different from a "Code Division Multiple Access (CDMA)" system. The UE or the eNode-B can use the configured RB to perform data transmission/reception operations.

Fig. 6 is a flowchart illustrating a method for scheduling radio resources of a mobile communication system according to a specific embodiment of the present invention. Depending on the needs, entities other than the eNode-B can also schedule data transmission or reception operations. For ease of description and a better understanding of the present invention, it is assumed that only the eNode-B performs the scheduling process.

The eNode-B allocates radio resources for data transmission to individual UEs connected to the eNode-B. And that is, as mentioned above, the radio resources are the representations of the RBs.

The radio resources can be allocated to the UEs when a request from the UEs is received. In the absence of requests from the UEs, the eNode-B may also pre-configure the radio resources to the UEs as needed.

The UE radio resource request processing procedure is executed according to a second layer of RACH, CQI, ACK/NACK and data type. Each UE receives the uplink radio resource configured by the eNode-B (step S60).

Each UE utilizes an uplink transmission path, where the UE is a transmitter, and its configured radio resources complete the uplink data transmission operation (step S61). After the UE uses the radio resources to complete the data transmission operation, uplink radio resources may remain.

For example, suppose that the eNode-B configures 100 RBs as uplink radio resources for a specific UE. If the radio resources used by the UE for uplink data transmission only have 80 RBs, there may be 20 RBs left in the UE.

If there are remaining radio resources after the specific UE completes the uplink data transmission, the specific UE will send a message containing a specific information to the eNode-B, thereby notifying the eNode-B of the remaining radio resources Resources (step S62). Preferably, the specific information is contained in a "Request for de-allocation of the allocated uplink radio resource" message, which is referred to below as "Request for de-allocation of the allocated uplink radio resource" radio resource allocation release request message" to request the eNode-B to release the configured radio resources.

The radio resource allocation release request message can be sent to a destination according to the second-layer data type as described in Figure 3, or sent to the destination through a specific physical channel. The following will describe in detail a representative example of a method for transmitting a message, which contains information about the configured radio resources according to the second-level data type.

For example, the above-mentioned radio resource configuration release request message can be included in a "protocol data unit (PDU)" of a MAC layer (hereinafter referred to as a "MAC PDU") and sent to the eNode-B. If the radio resource configuration release request message is included in the MAC PDU, the radio resource configuration release request message can use a 1-bit indicator to enable the MAC PDU containing the radio resource configuration release request message Send to a destination.

The 1-bit indicator can be set to "1" to indicate that the data transmitted for an uplink link is maintained in a buffer of the specific UE. The 1-bit indicator can be set to "0" to indicate that there is no more data for the transmission operation in the buffer of the specific UE.

If a 1-bit indicator set to "0" is received, the eNode-B recognizes that the uplink data transmission operation of the specific UE has been completed. Otherwise, if a 1-bit indicator set to "1" is received, the eNode-B recognizes that the specific UE still needs to transmit data for the uplink.

In another example, the RACH is a representative transmission channel and can be used to transmit the radio resource configuration release request message. The RACH represents a channel used to transmit an initial control message from the UE to the network.

Generally speaking, the RACH is adapted to synchronize between the UE and the network. In addition, if there is no remaining data for transmission in a UE that intends to transmit data in an uplink direction, the UE can use the RACH to obtain necessary radio resources.

The specific UE sends a radio resource configuration release request message to the eNode-B through RACH. A specific indicator can be included in one of the preamble of the RACH.

In another example, an uplink control signal can be used to transmit the radio resource configuration release request message. If necessary, it can also be combined with other uplink control signals to transmit the uplink control signal to a destination. There are various uplink control signals, such as CQI and ACK/NACK.

The information of the release request can be included in the CQI and ACK/NACK signals, so that if the UE transmits the CQI and ACK/NACK signals, the UE can notify the eNode-B to indicate that the data transmission operation is completed. The UE can also use the 1-bit indicator to transmit the release request information to the eNode-B.

In another example, a dedicated physical channel can be used to transmit the radio resource configuration release request message. When the eNode-B receives the radio resource configuration release request message, the person recognizes that there are unused radio resources. Then, the eNode-B reconfigures the unused radio resources, such as radio resources released by a specific UE, to other UEs (step S63).

The eNode-B can reconfigure the unused radio resources to the specific UE. If the eNode-B receives radio resource request messages from other UEs, the eNode-B can allocate the released radio resources to the UEs.

If necessary, in the absence of requests from other UEs, the eNode-B can also configure the released radio resources to other UEs. The radio resource request of other UEs can be executed according to the random access channel (RACH), CQI, ACK/NACK and data type of the second layer.

FIG. 7 is a flowchart illustrating a method for scheduling radio resources of a mobile communication system according to another embodiment of the present invention. That is, as shown in Fig. 7, at steps S70 and S71, to control the eNode-B to allocate certain radio resources to the specific UE processing procedures, and to control the specific UE to transmit/receive data through The processing procedure is equivalent to steps S60 and S61 described in Figure 6. In addition, if there are radio resources remaining in the UE after the uplink data transmission is completed, the method for transmitting the radio resource configuration release request message at step S72 in Fig. 7 is the same as that in Fig. 6 Said step S62.

The radio resource configuration release request message can be transmitted according to the data type of the second layer, can be transmitted through the RACH, or transmitted at the transmission time of control signals such as CQI and ACK/NACK. The 1-bit indicator is used as the radio resource configuration release request message.

Setting the 1-bit indicator to "1" indicates that the buffer of the UE still has data to be transmitted. Setting the 1-bit indicator to "0" means that there is no data for the transmission operation in the buffer of the specific UE. In this way, the UE can notify the eNode-B to indicate that there is information about the state of the buffer.

When receiving a radio resource configuration release request message from a specific UE, the eNode-B will send a radio resource configuration release complete message to the specific UE (step S73). If the eNode-B reconfigures the radio resources to other UEs after transmitting the radio resource release completion message, the eNode-B can prevent the specific UE from reusing the radio resources, thereby preventing occurrence The conflict between the specific UE and other UEs.

The radio resource release completion message can be transmitted through the control signal of the first or second layer. The radio resource release completion message can also be transmitted on a downlink shared channel (DL-SCH).

When the eNode-B receives the radio resource release request message from the specific UE after transmitting the radio resource configuration release complete message, the eNode-B reconfigures the released radio resources to other UEs. The radio resource configuration request message can be received from other UEs, and the released radio resources can be allocated to other UEs. In the absence of radio resource configuration request messages from other UEs, the eNode-B can also configure the released radio resources to other UEs.

This method for scheduling radio resources of a mobile communication system according to the present invention can use a message received from a specific UE to re-allocate the radio resources to other UEs, so that when the person completes the uplink data When the configured radio resources are still maintained in the specific UE after the transmission operation, the wasted resources can be minimized. In this way, the efficiency of data communication operations in a mobile communication system can be enhanced.

Those who are familiar with this technique will understand that various modifications and changes can be made in the present invention without departing from the spirit or scope of the present invention. Therefore, what is desired is that the present invention covers various modifications and changes of the present invention, if the attribution is within the scope of the patent application set out later and its equivalent items.

Since the present invention can be implemented in various forms without departing from its spirit or basic characteristics, it should also be understood that the above-mentioned specific embodiments are not limited to any details described in the preceding disclosure, unless otherwise specified. It should be interpreted broadly within the spirit and scope defined in the scope of the patent application set out below. Therefore, all changes and modifications within the domains and limits that belong to the scope of the patent application, or equivalent items of these domains and limits, shall be covered by the scope of the subsequent patent application.

The specific embodiments and advantages disclosed above are only exemplary, and should not be construed as limiting the present invention. This teaching can then be applied to other types of equipment.

The description of the present invention is of an explanatory nature, and is not intended to limit the scope of the patent application. For those who are familiar with this art, numerous alternatives, modifications and changes are indeed obvious. In the scope of the patent application, the device + function statement is to cover the structure quoted here to perform the function, and at the same time not only each structural equivalent item, but also each equivalent structure is included.

<b><u style="single">Industry applicability</u></b>

The present invention can be applied to a mobile communication system.

<p>410. . . Serial/parallel converter</p><p>420. . . DFT interspersed module</p><p>430. . . Subcarrier mapping unit</p><p>440. . . IFDT module</p><p>450. . . Parallel/Sequence Converter</p><p>460. . . Cyclic prefix insertion unit</p>

The accompanying drawings have been incorporated for further understanding of the present invention, and have been incorporated to form part of this application. These drawings illustrate the specific embodiment(s) of the present invention and are explained in conjunction with the detailed description. Principles of the invention. In different drawings, the properties, elements, and features of the present invention referenced by the same number represent the same, equivalent or similar properties, elements, and features according to one or more specific embodiments.

Figure 1 is a structural diagram illustrating a traditional "Long Term Evolution (LTE)" system belonging to a mobile communication system.

Figure 2 is a conceptual diagram, which illustrates a "user plane" of the traditional radio interface protocol structure between a UE and a UTRAN according to the 3GPP radio access network standard.

Figure 3 is a conceptual diagram, which illustrates a "user plane" of the traditional radio interface protocol structure between a UE and a UTRAN according to the 3GPP radio access network standard.

Figure 4 is a block diagram illustrating a conventional transmitter based on a DFT-S-OFDM rule.

Figure 5 is a conceptual diagram illustrating a traditional hybrid ARQ (HARQ) rule.

Fig. 6 is a flowchart illustrating a method for scheduling radio resources of a mobile communication system according to a specific embodiment of the present invention.

FIG. 7 is a flowchart illustrating a method for scheduling radio resources of a mobile communication system according to another embodiment of the present invention.