KR101198501B1 - A method for dynamic resource allocation and data transmission in mobile communication systems using relays - Google Patents

Abstract

A method of transmitting data by dynamically allocating resources in a mobile communication system using a repeater is proposed. According to an embodiment of the present invention, a method for transmitting data in a base station of a mobile communication system for dynamically allocating a resource includes dynamically allocating radio resources of each of the base station and the repeater; Transmitting a data signal to the repeater or the mobile terminal through a physical downlink shared channel; And transmitting a control signal including demodulation information of the data signal to the repeater or the mobile terminal through a physical downlink control channel.

Mobile communication system, repeater, relay, dynamic resource allocation

Description

A METHOD FOR DYNAMIC RESOURCE ALLOCATION AND DATA TRANSMISSION IN MOBILE COMMUNICATION SYSTEMS USING RELAYS}

An embodiment of the present invention relates to a method for transmitting data by dynamically allocating resources in a mobile communication system using a repeater, and in particular, a radio resource allocation for communication between a base station, a repeater, and a mobile terminal in a packet-based mobile communication system. The present invention relates to a method for dynamically allocating radio resources and transmitting data using a control channel.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research and Development. [Task management number: 2006-S-003-03, Task name: Development of next generation mobile communication service platform] .

The 3rd Generation Partnership Project (3GPP), an asynchronous mobile communication standardization organization, is conducting Long Term Evolution (LTE) standardization activities to develop next-generation mobile communication system standards. In addition, to meet the IMT-Advanced requirements, the LTE Advanced standard is being developed to complement the LTE standard.

Next-generation packet-based mobile communication system uses Orthogonal Frequency Division Multiple Access (OFDM) for downlink, and OFDM or Single Carrier Frequency Division Multiple Access (SC-FDMA) for uplink ) Method.

In general, a mobile communication system includes a base station constituting a cell and a mobile terminal used by a user, and a plurality of mobile terminals transmit and receive packet data with the base station through a wireless channel. In addition, in order to increase the communication radius of the base station and increase the communication capacity, a method of connecting a base station and a relay wirelessly and a repeater relaying communication between the terminal and the base station are introduced.

An evolved Node B (eNB) and a mobile terminal transmit and receive data and control information through a wireless channel. The mobile terminal can communicate when it is located within the communication radius of the base station, and uses a relay to extend the communication radius.

The repeater is a node connected to the base station through a wireless channel, and is a node responsible for transmitting data received through the wireless channel to the terminal and receiving and transmitting a wireless signal of the terminal to the base station. Accordingly, the terminal located within the communication radius of the repeater performs wireless communication with the repeater, which repeats the wireless relay to the base station.

A mobile communication system using a repeater uses a fixed allocation method that divides a radio resource into a time axis or a frequency axis and uses only the divided resources to prevent a collision when using a radio resource. Since this communication method uses a fixed whole radio resource, the use efficiency of the radio resource is reduced, and the time delay is greatly increased.

An embodiment of the present invention provides a method for transmitting data by dynamically allocating resources in a mobile communication system using a repeater.

According to an embodiment of the present invention, a base station of a mobile communication system dynamically allocates radio resources of a base station and a repeater, and transmits control signals including resource allocation information, path information for transmitting data, and demodulation information through a control channel. To provide.

Embodiments of the present invention provide a method of transmitting data by receiving a control signal including resource allocation information dynamically allocated by a base station through a control channel and communication path information and demodulation information in a repeater of a mobile communication system.

According to an embodiment of the present invention, a method for transmitting data in a base station of a mobile communication system for dynamically allocating a resource includes dynamically allocating radio resources of each of the base station and the repeater; Transmitting a data signal to the repeater or the mobile terminal through a physical downlink shared channel; And transmitting a control signal including demodulation information of the data signal to the repeater or the mobile terminal through a physical downlink control channel.

According to an embodiment of the present invention, a method of transmitting data in a repeater of a mobile resource allocation system includes: receiving a data signal from a base station through a physical downlink shared channel; Receiving a control signal including demodulation information of the data signal from the base station through a physical downlink control channel; Confirming radio resources dynamically allocated by checking radio resource information included in the control signal; Transmitting the data signal to a mobile terminal through the physical downlink shared channel; And transmitting the control signal including demodulation information of the data signal to the mobile terminal through the physical downlink control channel.

In a mobile communication system, a base station and a repeater, and a mobile station using a repeater for transmitting a control signal including a radio resource allocation and resource allocation information necessary for communication of the mobile terminal, path information for transmitting data and demodulation information through a control channel The present invention relates to a method for transmitting data by dynamically allocating resources in a communication system, and by using a base station and a repeater dynamically allocating radio resources, the use efficiency of radio resources can be improved. In addition, by supporting the retransmission operation between the base station and the repeater, and the repeater and the terminal to support the stable transmission of data.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements. If it is determined that the gist of the present invention may be unnecessarily obscured, the detailed description thereof will be omitted.

An embodiment of the present invention relates to a method for dynamically allocating radio resources and transmitting data using a control channel in a radio resource allocation method for communication between a base station, a repeater, and a mobile terminal in a packet-based mobile communication system.

1 is a diagram illustrating a configuration of a mobile communication system using a repeater for dynamically allocating radio resources according to an embodiment of the present invention. Referring to FIG. 1, a mobile communication system according to an exemplary embodiment of the present invention includes a base station 110, a repeater 120 and 130, and terminals 141, 142, 143, 144, and 145.

The repeaters 120 and 130 under the control of the base station 110 operate in synchronization with the corresponding base station 110 in time. Therefore, the radio resources used by the base station 110 and the repeaters 120 and 130 for signal transmission use the same time, and are physical downlink control channel (PDCCH) and physical downlink shared channel (PDSCH). Physical channel transmission times, such as Physical Downlink Shared Channel), are also maintained.

The operation of selecting a radio resource for transmitting data input to the base station 110 to the terminal is performed by the base station 110. In addition, the base station 110 also performs radio resources for transmission from the base station 110 to the repeaters 120 and 130 and radio resources for transmitting from the repeaters 120 and 130 to the terminals 144 and 145. The base station 110 may transmit data directly to the terminals 144 and 145 or via the repeaters 120 and 130, and the path is determined by the base station 110. In addition, the repeaters 120 and 130 may be configured to receive data directly transmitted from the base station 110 to the terminals 144 and 145 and to relay the data to the terminals 144 and 145.

In order to support the above operation, the present invention uses the PDCCH to dynamically allocate radio resources.

2 is a diagram illustrating a downlink radio channel transmission structure of a packet-based mobile communication system using repeaters 120 and 130 according to an embodiment of the present invention.

Referring to FIG. 2, the base station 110 transmits a radio resource determined by scheduling when transmitting data using a PDCCH and a PDSCH channel. The base station 110 can freely select a radio resource divided into a time axis and a frequency axis according to radio channel state information and a radio resource allocation policy, and demodulation information of data transmitted through a PDSCH is transmitted through a PDCCH.

The control signal transmitted through the PDCCH includes information such as Modulation and Coding Scheme (MCS) information, antenna information, retransmission information, radio channel location, and the like, transmitted through the PDSCH. Use cyclic redundancy check (CRC). The transmitted route information is transmitted using a Radio Network Temporary Identifier (RNTI) masked on the CRC information.

In case of direct transmission from the base station 110 to the terminal, a terminal identifier (C-RNTI) is used, and in case of transmission to the relays (120, 130), a relay identifier (Relay-RNTI) assigned to the repeaters (120, 130). To display. The relay identifier (Relay-RNTI) for distinguishing the repeaters 120 and 130 may be allocated from the base station 110 when the repeaters 120 and 130 are initially set.

In order for the repeaters 120 and 130 and the terminal to demodulate the data signals transmitted through one PDSCH at the same time, the base station 110 transmits the signal indicated by the terminal identifier (C-RNTI). The terminal identifier (C-RNTI) of the terminal located within the communication radius of the repeaters 120 and 130 may be received and managed from the base station 110 in advance. The repeaters 120 and 130 demodulate data signals continuously received through the PDCCH using the information of the terminal identifier received from the base station 110. The data signal received through the PDCCH identified by the C-RNTI of the terminal located within the communication radius of the repeaters 120 and 130 may be demodulated, including the relay-RNTI assigned to the repeaters 120 and 130 itself.

The repeaters 120 and 130 demodulate the control signals received through the PDCCH, and then demodulate the data signals received through the corresponding PDSCH using the demodulation information.

The repeaters 120 and 130 use radio resource allocation information notified by the base station 110 when transmitting data 120 to the terminal, and transmit the data using the PDCCH and PDSCH channels. The demodulation information of the PDSCH relayed by the relays 120 and 130 is represented by a PDCCH, and the identification of the PDSCH uses a terminal identifier (C-RNTI) for reception compatibility of the terminal.

The method for the base station 110 to notify the radio resource allocation information of the PDSCH to be transmitted by the repeaters 120 and 130 to the terminal may be transmitted through the PDCCH or the PDSCH. When transmitting on the PDCCH, the transmitter-terminal link demodulation information may be included in the PDCCH for the base station-relay link. When transmitting on the PDSCH, the transmitter-terminal demodulation information may be included in the data to be transmitted.

A retransmission scheme used for stable transmission of a transmitting PDSCH may use a hybrid automatic request (HARQ), and the HARQ operates by dividing a base station-relay link and a repeater-terminal link. In addition, the base station and the terminal may directly perform HARQ. Information such as the HARQ process number and the number of retransmissions is transmitted through the PDCCH.

3 is a diagram illustrating a flow of data and a retransmission result signal in a packet-based mobile communication system using a repeater according to an embodiment of the present invention.

In the retransmission operation of the link between the base station 310 and the repeater 320, the base station 310 transmits a control signal and a data signal from the base station 310 to the repeater 320 through the PDCCH and the PDSCH after the base station 310 sets up the retransmission environment. 320 notifies the base station 310 of the retransmission reception result in uplink after demodulating the data. If the result is notified of a reception error, the base station 310 retransmits the data.

The retransmission operation of the repeater 320 and the terminal 340 transmits a control signal and a data signal from the repeater 320 to the terminal 340 through the PDCCH and PDSCH, and the terminal 340 retransmits the data in uplink after demodulation. Notify the reception result. When the result is notified of the reception error, the repeater 320 retransmits the data. At this time, if the repeater 320 normally stores the data to be retransmitted, the data is retransmitted. If not, the repeater 320 waits until normal data is received from the base station 310 and then retransmits the data. The retransmission time can be variably selected according to the radio channel environment and the scheduling environment.

The uplink dynamic radio resource allocation scheme of the terminal 340-repeater 320 link and the repeater 320-base station 310 link uses the same procedure and structure as the foregoing description of the present invention, and thus a detailed description thereof will be omitted. . Information transmitted through a physical uplink shared channel (PUSCH) that is uplink is indicated through a physical uplink control channel (PUCCH), and uplink data transmission of a terminal and a repeater is performed by a PUSCH. Is done using Downlink radio channel state information and other measurement information measured by the terminal are transmitted to the repeater 320 and the base station 310 through the PDCCH. When the terminal 340 transmits a scheduling request signal and information necessary for scheduling to the repeater 320, the repeater 320 wirelessly relays the corresponding information to the base station 310.

Hereinafter, a method of dynamically allocating resources and transmitting data in a mobile communication system using a repeater according to the present invention configured as described above will be described with reference to the accompanying drawings.

4 is a flowchart illustrating a process of transmitting data by dynamically allocating a radio resource in a base station of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 4, in step 410, the base station dynamically allocates radio resources used by the base station and the repeater to transmit data.

Thereafter, the base station transmits a control signal including demodulation information of data to be transmitted through the PDCCH to the repeater or the terminal in step 412, and transmits the data signal to the repeater or the terminal through the PDSCH in step 414. Here, the control signal includes demodulation information of the data signal transmitted through the PDSCH, antenna information, retransmission information indicating whether it is retransmission, radio channel position information which is radio resource allocation information allocated to a relay, and path information indicating a transmission path of data. Include.

Thereafter, when the base station receives the retransmission result of the data signal transmitted from the terminal or the repeater in step 416, the base station determines whether the retransmission result means a transmission error in step 418.

In step 418, if there is an error, the base station proceeds to step 420 and retransmits the control signal and the data signal through the PDCCH and PDSCH.

However, if there is no error as a result of checking in step 418, the base station terminates the present algorithm.

5 is a flowchart illustrating a process of relaying data received according to a dynamically allocated radio resource in a repeater of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 5, the repeater receives a control signal including demodulation information of data through a PDCCH from a base station in step 510, and receives a data signal through a PDSCH in step 512.

Here, the control signal includes demodulation information of the data signal transmitted through the PDSCH, antenna information, retransmission information indicating whether it is retransmission, radio channel position information which is radio resource allocation information allocated to a relay, and path information indicating a transmission path of data. It includes.

In step 512, the repeater demodulates the received data signal using demodulation information included in the control signal and checks whether an error exists in the data signal.

If an error exists in the received data signal as a result of step 512, the repeater proceeds to step 516 to transmit a retransmission result signal indicating that an error exists to the base station, and performs steps 510 to 514 again for retransmission.

If no error exists in the received data signal as a result of step 512, the repeater proceeds to step 518 and transmits a retransmission result signal indicating that no error exists to the base station. In step 520, the control signal including the demodulation information of the data to be transmitted through the PDCCH is transmitted to the terminal, and in step 522, the data signal is transmitted to the terminal through the PDSCH.

Thereafter, if the repeater receives the retransmission result for the data signal transmitted from the terminal in step 524, the process proceeds to step 526 and checks whether the retransmission result means a transmission error. If no error exists in step 526, the repeater terminates the algorithm.

However, if an error exists in step 526, the repeater proceeds to step 528 to check whether control signals and data signals to be retransmitted to the repeater are stored.

If the control signal and data signal to be retransmitted exist in step 528, the repeater proceeds to step 530 to retransmit the control signal and data signal through the PDCCH and PDSCH.

However, if the control signal and data signal to be retransmitted in step 528 does not exist, the repeater proceeds to step 532 and transmits a retransmission result signal indicating that an error exists to the base station. Do it again.

Further, embodiments of the present invention include a computer readable medium having program instructions for performing various computer implemented operations. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The media may be program instructions that are specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

1 is a diagram illustrating a configuration of a mobile communication system using a repeater for dynamically allocating radio resources according to an embodiment of the present invention;

2 illustrates a downlink radio channel transmission structure of a packet based mobile communication system using a repeater according to an embodiment of the present invention;

3 is a diagram illustrating a flow of data and a retransmission result signal in a packet-based mobile communication system using a repeater according to an embodiment of the present invention;

4 is a flowchart illustrating a process of transmitting data by dynamically allocating a radio resource in a base station of a mobile communication system according to an embodiment of the present invention;

5 is a flowchart illustrating a process of relaying data received according to a dynamically allocated radio resource in a repeater of a mobile communication system according to an embodiment of the present invention.

Claims (9)

Dynamically allocating radio resources of each of the base station and the repeater; Transmitting a data signal to the repeater or the mobile terminal through a physical downlink shared channel; And Transmitting a control signal including demodulation information of the data signal to the repeater or the mobile terminal through a physical downlink control channel; A method for transmitting data at a base station of a mobile communication system for allocating dynamic resources. The method of claim 1, And retransmitting the control signal and the data signal when receiving a retransmission result signal indicating that an error exists in the data signal from a repeater or a terminal. A method for transmitting data at a base station of a mobile communication system for allocating dynamic resources. The method of claim 1, The control signal is, At least one of the demodulation information, antenna information, retransmission information, radio resource allocation information, and path information indicating a transmission path of data; A method for transmitting data at a base station of a mobile communication system for allocating dynamic resources. The method of claim 3, The route information, Masking is displayed on the cyclic redundancy check information included in the control signal A method for transmitting data at a base station of a mobile communication system for allocating dynamic resources. Receiving a data signal through a physical downlink shared channel from a base station; Receiving a control signal including demodulation information of the data signal from the base station through a physical downlink control channel; Confirming radio resources dynamically allocated by checking radio resource information included in the control signal; Transmitting the data signal to a mobile terminal through the physical downlink shared channel; And Transmitting the control signal including demodulation information of the data signal to the mobile terminal through the physical downlink control channel; A method for transmitting data in a repeater of a mobile communication system for allocating dynamic resources. The method of claim 5, Demodulating the data signal using demodulation information included in the control signal when receiving the data signal and the control signal from the base station; Checking whether an error exists in the data signal; And Transmitting a retransmission result signal including information indicating whether an error exists in the data signal to the base station; A method for transmitting data in a repeater of a mobile communication system for allocating dynamic resources. The method of claim 5, And retransmitting the control signal and the data signal when receiving a retransmission result signal indicating that an error exists in the data signal from the mobile terminal. A method for transmitting data in a repeater of a mobile communication system for allocating dynamic resources. The method of claim 5, The control signal is, And at least one of the demodulation information, antenna information, retransmission information, the radio resource allocation information, and path information indicating a transmission path of data. A method for transmitting data in a repeater of a mobile communication system for allocating dynamic resources. 9. The method of claim 8, The route information, Masking is displayed on the cyclic redundancy check information included in the control signal A method for transmitting data in a repeater of a mobile communication system for allocating dynamic resources.

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