KR20120129610A - Method for transceiving downlink signal in wireless communication system and apparatus therefor - Google Patents

Abstract

PURPOSE: A downlink signal transmission and reception method and apparatus therefor are provided to reduce power consumption by enabling a terminal to effectively receive a downlink signal in a wireless communication system. CONSTITUTION: A processor(1010) transmits a request message for receiving a downlink signal to a base station in a power saving mode. The processor receives scheduling information which defines a waiting mode, an activation mode, and resource allocation information from the base station. The resource allocation information includes bandwidth information for a downlink signal. The downlink signal is received in the activation mode. The reception of the downlink is waited in the waiting mode. The processor receives the downlink signal by repeating the activation mode and the waiting mode. [Reference numerals] (1010) Processor; (1020) Memory; (1030) RF module; (1040) Display module; (1050) User interface module

Description

Method for transmitting and receiving downlink signal in a wireless communication system and apparatus therefor {METHOD FOR TRANSCEIVING DOWNLINK SIGNAL IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR}

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and apparatus for transmitting and receiving downlink signals in a wireless communication system.

As an example of a mobile communication system to which the present invention may be applied, a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)) communication system will be described in brief.

1 is a diagram schematically illustrating an E-UMTS network structure as an example of a mobile communication system. The Evolved Universal Mobile Telecommunications System (E-UMTS) system evolved from the existing Universal Mobile Telecommunications System (UMTS), and is currently undergoing basic standardization work in 3GPP. In general, E-UMTS may be referred to as an LTE (Long Term Evolution) system. For details of the technical specifications of UMTS and E-UMTS, refer to Release 7 and Release 8 of "3rd Generation Partnership Project (Technical Specification Group Radio Access Network)" respectively.

1, an E-UMTS is located at the end of a user equipment (UE) 120, an eNode B (eNode B) 110a and 110b, and a network (E-UTRAN) And an access gateway (AG). The base station may transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.

One or more cells exist in one base station. The cell is set to one of the bandwidths of 1.25, 2.5, 5, 10, 15, 20Mhz and the like to provide downlink or uplink transmission service to a plurality of UEs. Different cells may be configured to provide different bandwidths. The base station controls data transmission and reception for a plurality of terminals. For downlink (DL) data, the base station transmits downlink scheduling information, which is related to time / frequency domain, encoding, data size, and hybrid automatic repeat and reQuest (HARQ) request for data to be transmitted to the corresponding UE. Give information and more. In addition, the base station transmits uplink scheduling information to the terminal for uplink (UL) data and informs the user equipment of time / frequency domain, encoding, data size, and hybrid automatic retransmission request information. An interface for transmitting user traffic or control traffic may be used between base stations. The Core Network (CN) can be composed of an AG and a network node for user registration of the UE. The AG manages the mobility of the UE in units of a tracking area (TA) composed of a plurality of cells.

Wireless communication technologies have been developed to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing. In addition, as other radio access technologies continue to be developed, new technological evolution is required to be competitive in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interface, and adequate power consumption of the terminal are required.

An object of the present invention is to provide a method and apparatus for transmitting and receiving downlink signals in a wireless communication system.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

In a wireless communication system according to an aspect of the present invention, a method for receiving a downlink signal by a terminal includes: transmitting a request message for receiving a downlink signal to a base station in a power saving mode; Receiving resource allocation information including bandwidth information for a downlink signal from the base station; Receiving scheduling information defining an active mode capable of receiving the downlink signal and a standby mode waiting for reception of the downlink signal; And repeating the active mode and the standby mode to receive the downlink signal, wherein the bandwidth is allocated in units of n terminals that have transmitted the request message to the base station, and the active mode duration is 1 / n second, and the standby mode duration is (n-1) / n seconds. Here, the scheduling information includes timing synchronization information for the terminal to transition to the active mode.

Preferably, the method further includes receiving scheduling information including active mode duration information changed in the active mode, and more preferably, generating the request message when the remaining power of the terminal is less than or equal to a threshold. It characterized in that it further comprises.

In another aspect of the present invention, a method of transmitting a downlink signal by a base station in a wireless communication system includes: receiving a request message for receiving a downlink signal in a power saving mode from one or more terminals; Transmitting resource allocation information including bandwidth information for a downlink signal to each of the one or more terminals; Transmitting scheduling information for each of the one or more terminals, defining an active mode capable of transmitting the downlink signal and a standby mode waiting for transmission of the downlink signal; And transmitting the downlink signal by repeating the active mode and the standby mode for each of the one or more terminals, wherein the bandwidth is allocated in units of n terminals that have transmitted the request message to the base station. And the active mode duration is 1 / n second, and the standby mode duration is (n-1) / n second. Here, the scheduling information includes timing synchronization information for each of the one or more terminals to transition to the active mode.

On the other hand, the terminal device in a wireless communication system that is an aspect of the present invention, a display module; A user input module for receiving a command from a user; A wireless communication module for transmitting and receiving a signal with a base station; And a processor for controlling the wireless communication module and processing the signal, wherein the processor transmits a request message for receiving a downlink signal in a power saving mode to the base station, and transmits a downlink signal from the base station. Receives resource allocation information including bandwidth information and scheduling information defining an active mode capable of receiving the downlink signal and a standby mode waiting for reception of the downlink signal, wherein the active mode and the standby mode Repeats to receive the downlink signal, the bandwidth is allocated in units of n terminals that have transmitted the request message to the base station, the active mode duration is 1 / n seconds, and the standby mode duration is ( n-1) / n seconds. Here, the scheduling information may include timing synchronization information for the terminal to transition to the active mode.

Preferably, the processor receives scheduling information including active mode duration information changed in the active mode, and more preferably, when the remaining power of the terminal is less than or equal to a threshold, generates the request message. It is done.

In another aspect, a base station apparatus in a wireless communication system includes a wireless communication module for transmitting and receiving a signal with a terminal; And a processor for controlling the wireless communication module and processing the signal, the processor receiving a request message for receiving a downlink signal in a power saving mode from one or more terminals, and receiving the one or more terminals. Resource allocation information including bandwidth information for a downlink signal, and an active mode capable of transmitting the downlink signal for each of the one or more terminals, and a standby mode waiting for transmission of the downlink signal. Transmits the scheduling information, and transmits the downlink signal by repeating the active mode and the standby mode for each of the one or more terminals, and the bandwidth is allocated in units of n terminals that have transmitted the request message to the base station. The active mode duration is 1 / n seconds, Standby mode duration is the (n-1) / n wherein the second. Here, the scheduling information includes timing synchronization information for each of the one or more terminals to transition to the active mode.

According to embodiments of the present invention, the terminal may efficiently receive the downlink signal in the wireless communication system. In particular, the terminal can receive the downlink signal at the same speed using less power than the conventional scheme.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 is a diagram schematically illustrating an E-UMTS network structure as an example of a mobile communication system;
FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on a 3GPP radio access network standard; FIG.
FIG. 3 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same; FIG.
4 is a diagram illustrating a structure of a radio frame used in an LTE system;
5 and 6 are conceptual diagrams for explaining a technique for determining a downlink bandwidth in a conventional LTE system,
7 is a conceptual diagram illustrating a technique for determining a downlink bandwidth of an LTE system according to an embodiment of the present invention;
8 is a flowchart illustrating a process of receiving downlink data by a terminal according to an embodiment of the present invention;
9 is a flowchart illustrating a process of transmitting downlink data by a base station according to an embodiment of the present invention;
10 illustrates a block diagram of a communication transceiver according to an embodiment of the present invention.

Hereinafter, the structure, operation and other features of the present invention will be readily understood by the embodiments of the present invention described with reference to the accompanying drawings. The embodiments described below are examples in which technical features of the present invention are applied to a 3GPP system.

2 is a diagram showing a control plane and a user plane structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard. The control plane refers to a path through which control messages used by a UE and a network are transferred. The user plane means a path through which data generated in the application layer, for example, voice data or Internet packet data, is transmitted.

The physical layer as the first layer provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to a medium access control layer (upper layer) through a transport channel. Data moves between the MAC layer and the physical layer over the transport channel. Data is transferred between the transmitting side and the receiving side physical layer through the physical channel. The physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is modulated in an OFDMA (Orthogonal Frequency Division Multiple Access) scheme in a downlink, and is modulated in an SC-FDMA (Single Carrier Frequency Division Multiple Access) scheme in an uplink.

The Medium Access Control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is an upper layer, through a logical channel. The RLC layer of the second layer supports reliable data transmission. The function of the RLC layer may be implemented as a functional block inside the MAC. The PDCP (Packet Data Convergence Protocol) layer of the second layer provides unnecessary control for efficiently transmitting IP packets such as IPv4 or IPv6 over a narrow bandwidth air interface. It performs header compression function that reduces information.

The Radio Resource Control (RRC) layer located at the bottom of the third layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transport channels, and physical channels in connection with configuration, reconfiguration, and release of radio bearers. The radio bearer refers to a service provided by the second layer for data transmission between the terminal and the network. To this end, the terminal and the RRC layer of the network exchange RRC messages with each other. If there is an RRC connection (RRC Connected) between the UE and the RRC layer of the network, the UE is in the RRC Connected Mode, otherwise it is in the RRC Idle Mode. The Non-Access Stratum (NAS) layer at the top of the RRC layer performs functions such as session management and mobility management.

One cell constituting the base station eNB is set to one of the bandwidths of 1.25, 2.5, 5, 10, 15, 20Mhz and the like to provide a downlink or uplink transmission service to a plurality of terminals. Different cells may be configured to provide different bandwidths.

A downlink transmission channel for transmitting data from a network to a terminal includes a BCH (Broadcast Channel) for transmitting system information, a PCH (Paging Channel) for transmitting a paging message, a downlink SCH (Shared Channel) for transmitting user traffic or control messages, have. In case of a traffic or control message of a downlink multicast or broadcast service, it may be transmitted through a downlink SCH, or may be transmitted via a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the UE to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink SCH (shared channel) for transmitting user traffic or control messages. It is located above the transport channel, and the logical channel mapped to the transport channel is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and an MTCH (multicast). Traffic Channel).

FIG. 3 is a diagram for describing physical channels used in a 3GPP system and a general signal transmission method using the same.

When the terminal is turned on or newly enters a cell, the terminal performs an initial cell search operation such as synchronizing with the base station (S301). To this end, the terminal receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from a base station and synchronizes with the base station and acquires information such as a cell ID have. Then, the terminal can receive the physical broadcast channel from the base station and acquire the in-cell broadcast information. Meanwhile, the UE can receive the downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.

After completing the initial cell search, the UE acquires more specific system information by receiving a physical downlink control channel (PDSCH) according to a physical downlink control channel (PDCCH) and information on the PDCCH. It may be (S302).

On the other hand, if the base station is initially connected or there is no radio resource for signal transmission, the mobile station can perform a random access procedure (RACH) on the base station (steps S303 to S306). To do this, the UE transmits a specific sequence through a Physical Random Access Channel (PRACH) (S303 and S305), and receives a response message for the preamble on the PDCCH and the corresponding PDSCH S304 and S306). In case of the contention-based RACH, a contention resolution procedure can be additionally performed.

After performing the procedure as described above, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control channel (Physical Uplink) as a general uplink / downlink signal transmission procedure. Control Channel (PUCCH) transmission (S308) may be performed. The control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), and the like. It includes. In the case of the 3GPP LTE system, the UE can transmit control information such as CQI / PMI / RI as described above through PUSCH and / or PUCCH.

4 is a diagram illustrating a structure of a radio frame used in an LTE system.

Referring to FIG. 4, a radio frame has a length of 10 ms (327200? T _s ) and consists of 10 equally sized subframes. Each subframe has a length of 1 ms and is composed of two slots. Each slot has a length of 0.5 ms (15360? T _s ). Here, T _s represents a sampling time and is represented by Ts = 1 / (15 kHz x 2048) = 3.2552 x 10 ^-8 (about 33 ns). The slot includes a plurality of OFDM symbols or SC-FDMA symbols in the time domain and a plurality of resource blocks in the frequency domain. In an LTE system, one resource block includes 12 subcarriers x 7 (6) OFDM symbols or SC-FDMA symbols. A TTI (Transmission Time Interval), which is a unit time at which data is transmitted, may be defined in units of one or more subframes. The structure of the above-described radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe, the number of OFDM symbols or SC-FDMA symbols included in the slot may be variously changed. have.

5 and 6 are conceptual diagrams for explaining a technique for determining a downlink bandwidth in a conventional LTE system.

In the conventional LTE system, the downlink bandwidth may support a data rate of 50 Mbps with a bandwidth of 10 MHz when one user, that is, one terminal receives a downlink signal as shown in FIG. 5. However, as shown in FIG. 6, when two terminals receive a downlink signal, each terminal supports a data rate of 25 Mbps with a bandwidth of 5 MHz. That is, in the conventional LTE system, the downlink bandwidth may be summarized as a method of determining the data rate by adjusting the bandwidth according to the number of users controlled by the base station.

On the other hand, the power consumption of the terminal consists of the power required for demodulation of the downlink signal and the power required for amplifying the uplink signal, wherein the power for uplink signal transmission occupies most of the power consumption. Here, in the conventional LTE system, the technique of determining the downlink bandwidth is a method of determining the data rate by adjusting the bandwidth according to the number of users, and there is no difference in power consumption according to the data rate. That is, there is no difference in power consumption between modulating a signal transmitted at a data rate of 50 Mbps and modulating a signal transmitted at a data rate of 25 Mbps. Therefore, according to the conventional scheme, as the number of users increases, the resource allocated to the downlink signal decreases and thus the data rate decreases. Accordingly, the time for receiving the downlink signal increases, thereby increasing current consumption and heat generation. There is a problem of increase.

7 is a conceptual diagram illustrating a technique for determining a downlink bandwidth of an LTE system according to an embodiment of the present invention.

Since there is no power consumption of the UE according to the downlink data rate, the technique for determining the downlink bandwidth of the LTE system according to the embodiment of the present invention distributes time according to the number of users, rather than adjusting the bandwidth according to the number of users. By drastically reducing the power consumption of the terminal. In summary, in the present invention, instead of focusing transmission resources on each terminal, the transmission time is distributed to each terminal to reduce power consumption.

That is, assuming that the current maximum allocation bandwidth is f MHz and the number of terminals currently controlled by the base station is n, according to the prior art, the bandwidth is allocated to each terminal through the PDCCH, but according to the present invention, Although the total bandwidth f Mhz is allocated through the PDCCH, time resources are allocated to each user equipment by 1 / n second through downlink scheduling. Therefore, n users alternately receive downlink signals through the PDSCH. For example, if two users receive 1 Gbit of data at a data rate of 25 Mbps, each user will consume 40 seconds of current continuously. However, when the same data is allocated to each user by alternating a data rate of 50 Mbps in units of 1 second, each user may complete data reception after 39 seconds and 40 seconds.

More specifically, the terminal according to the present invention operates in the active mode for 1 / n seconds allocated to receive the downlink signal, and enters the standby mode for power reduction for the remaining (n-1) / n seconds. While operating in the active mode, the terminal should define a standby mode and set to automatically transition from the standby mode to the active mode after (n-1) / n seconds have elapsed when entering the standby mode. If, when entering the standby mode, periodically wakes up according to the slot cycle like the RRC idle state and requests the base station to change the scheduling, the power consumption is not reduced. Therefore, when entering the active mode, the scheduling is changed according to the number of users sharing the current time and the network state, and it is preferable to enter the standby mode and re-enter the active mode according to the changed scheduling. More preferably, the time to transition from the standby mode to the active mode may be based on the scheduling set in the active mode immediately before entering the standby mode. Therefore, although the UE normally operates in the RRC idle state, when the existence of data to be received through the control channel is confirmed, the UE enters the active mode and receives data for 1 / n seconds. Thereafter, the active mode and the standby mode are repeated, but after the data reception is completed, the RRC idle state is entered again.

Meanwhile, when a user requests new data to the network through an uplink channel while receiving a downlink signal including specific data, the base station, i.e., the network, depends on the number of users who are sharing the current time at the time of the user's request. Based on the above, the active mode and the standby mode are reset, and new data is transmitted accordingly. After completion of the new data reception, the terminal receives the existing specific data again.

Although the number of users sharing time resources is N, we can consider the case where 1 is added. If n users are currently sharing time resources, each terminal operates in the active mode for 1 / n seconds and in the standby mode for (n-1) / n seconds. In this case, if one user is added as a user sharing the time resource, each terminal is operated in the active mode for 1 / (n + 1) seconds by applying new scheduling when entering the active mode, and n / (n + 1). It operates in standby mode for a second.

In addition, the terminal may provide a user interface for selecting an existing data rate determination method and the data rate determination method of the present invention. The data rate determination method of the present invention may be referred to as a power saving mode for convenience of description, and the base station may allocate the maximum possible bandwidth based on the number of users who have selected the power saving mode. From the user's point of view, only the power consumption is reduced and there is no difference in the downlink signal reception time itself compared to the conventional scheme. On the other hand, the user interface may be set to be a pop-up when the remaining power of the terminal falls below the threshold. Alternatively, when the remaining power of the terminal is lower than the threshold, it is also possible to implement that the signal to request to transmit data in the power saving mode is automatically transmitted to the base station.

8 is a flowchart illustrating a process of receiving downlink data by a terminal according to an embodiment of the present invention.

Referring to FIG. 8, the terminal receives a downlink signal in a power saving mode through a user interface when the remaining power of the terminal falls below a threshold, for example, by an event generated by a preset condition in step 801. You can choose to do it. Accordingly, the terminal may request the base station to transmit the downlink signal in the power saving mode.

Upon receiving the resource allocation information from the base station, the terminal allocates the maximum bandwidth signaled by the base station in step 802 and performs setting for receiving a downlink signal at the maximum data rate. In step 803, the terminal receives the resource allocation information. Perform the setting of active mode and standby mode. More specifically, when n users request the power saving mode from the base station, the terminal operates in the active mode for 1 / n seconds and sets to enter the standby mode for power reduction for the remaining (n-1) / n seconds. . In particular, the resource allocation information includes timing synchronization for operating in the active mode, and the terminal sets a time to transition to the active mode based on the timing synchronization information.

Finally, the terminal receives the downlink signal in the power saving mode in step 804. That is, the terminal enters the active mode and receives data for 1 / n seconds, and then repeats the active mode and the standby mode, but enters the RRC idle state again after the data reception is completed.

9 is a flowchart illustrating a process of transmitting downlink data by a base station according to an embodiment of the present invention.

Referring to FIG. 9, the base station checks the number n of terminals requesting to receive a downlink signal in a power saving mode in step 901. Subsequently, the base station defines an active mode and a standby mode of each terminal in step 902 based on the number n of the terminals. Specifically, the terminal operates in the active mode for 1 / n seconds, enters the standby mode for power reduction for the remaining (n-1) / n seconds, and defines timing synchronization information for operating in the active mode.

Thereafter, the base station signals the active mode and the standby mode information through the PDCCH in step 903. That is, it is preferable that the elapsed time of the active mode and the elapsed time of the standby mode are signaled to each terminal, but the timing synchronization and the maximum bandwidth for operating in the active mode are also included in the PDCCH.

Finally, the base station transmits a downlink signal in a power saving mode in step 904. That is, data is transmitted to the respective terminals at the maximum bandwidth, but only the corresponding data is transmitted to each terminal only in a section in which the terminal operates in the active mode.

According to the present invention, there is no difference from the conventional method in terms of data reception completion time, but there is an advantage of reducing the power consumption to 50% compared to the conventional method.

10 illustrates a block diagram of a communication transceiver according to an embodiment of the present invention. The transceiver may be part of a base station or a terminal.

Referring to FIG. 10, the transceiver 1000 includes a processor 1010, a memory 1020, an RF module 1030, a display module 1040, and a user interface module 1050.

The transceiver 1000 is shown for convenience of description and some modules may be omitted. In addition, the transceiver 1000 may further include necessary modules. In addition, some modules in the transceiver 1000 may be classified into more granular modules. The processor 1020 is configured to perform an operation according to the embodiment of the present invention illustrated with reference to the drawings.

In detail, when the transceiver 1000 is part of a base station, the processor 1020 may generate a control signal and perform mapping to a control channel set in a plurality of frequency blocks. In addition, when the transceiver 1000 is part of a terminal, the processor 1020 may check a control channel directed to the user from signals received from the plurality of frequency blocks and extract a control signal therefrom.

Thereafter, the processor 1020 may perform a required operation based on the control signal. Detailed operations of the processor 1020 may refer to the contents described with reference to FIGS. 1 to 9.

The memory 1020 is connected to the processor 1010 and stores an operating system, an application, program code, data, and the like. The RF module 1030 is connected to the processor 1010 and performs a function of converting a baseband signal into a radio signal or converting a radio signal into a baseband signal. To this end, the RF module 1030 performs analog conversion, amplification, filtering and frequency up-conversion, or a reverse process thereof. The display module 1040 is connected to the processor 1010 and displays various information. The display module 1040 may use well-known elements such as, but not limited to, a liquid crystal display (LCD), a light emitting diode (LED), and an organic light emitting diode (OLED). The user interface module 1050 is connected to the processor 1010 and may be configured with a combination of well-known user interfaces such as a keypad, a touch screen, and the like.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

In this document, the embodiments of the present invention have been mainly described with reference to the data transmission / reception relationship between the terminal and the base station. The specific operation described herein as being performed by the base station may be performed by its upper node, in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The present invention can be applied to a wireless communication system. More specifically, the present invention can be applied to a method and apparatus for transmitting and receiving downlink signals in a wireless communication system.

Claims (12)

A method for receiving a downlink signal by a terminal in a wireless communication system,
Transmitting a request message to receive a downlink signal in a power saving mode to the base station;
Receiving resource allocation information including bandwidth information for a downlink signal from the base station;
Receiving scheduling information defining an active mode capable of receiving the downlink signal and a standby mode waiting for reception of the downlink signal; And
Repeating the active mode and the standby mode to receive the downlink signal;
The bandwidth is allocated in units of n terminals that transmitted the request message to the base station,
The active mode duration is 1 / n seconds, the standby mode duration is characterized in that (n-1) / n seconds,
And receiving the downlink signal. The method of claim 1,
The scheduling information,
Characterized in that the terminal includes the timing synchronization information for transition to the active mode,
And receiving the downlink signal. The method of claim 1,
And receiving scheduling information including active mode duration information changed in the active mode.
And receiving the downlink signal. The method of claim 1,
If the remaining power of the terminal is less than the threshold, characterized in that it further comprises the step of generating the request message,
And receiving the downlink signal. A method for transmitting a downlink signal by a base station in a wireless communication system,
Receiving a request message for receiving a downlink signal in a power saving mode from at least one terminal;
Transmitting resource allocation information including bandwidth information for a downlink signal to each of the one or more terminals;
Transmitting scheduling information for each of the one or more terminals, defining an active mode capable of transmitting the downlink signal and a standby mode waiting for transmission of the downlink signal; And
Transmitting the downlink signal by repeating the active mode and the standby mode for each of the one or more terminals;
The bandwidth is allocated in units of n terminals that transmitted the request message to the base station,
The active mode duration is 1 / n seconds, the standby mode duration is characterized in that (n-1) / n seconds,
Downlink signal transmission method. The method of claim 5, wherein
The scheduling information,
Characterized in that each of the one or more terminals includes timing synchronization information for transitioning to an active mode.
Downlink signal transmission method. A terminal apparatus in a wireless communication system,
Display module;
A user input module for receiving a command from a user;
A wireless communication module for transmitting and receiving a signal with a base station; And
A processor for controlling the wireless communication module and processing the signal;
The processor comprising:
An active mode capable of transmitting a request message for receiving a downlink signal in a power saving mode to the base station, and receiving resource allocation information including bandwidth information for the downlink signal from the base station and the downlink signal; Receiving scheduling information defining a standby mode waiting for reception of a downlink signal, receiving the downlink signal by repeating the active mode and the standby mode,
The bandwidth is allocated in units of n terminals that transmitted the request message to the base station,
The active mode duration is 1 / n seconds, the standby mode duration is characterized in that (n-1) / n seconds,
Terminal device. The method of claim 7, wherein
The scheduling information,
Characterized in that the terminal includes the timing synchronization information for transition to the active mode,
Terminal device. The method of claim 7, wherein
The processor comprising:
Receiving scheduling information including active mode duration information changed in the active mode,
Terminal device. The method of claim 7, wherein
The processor comprising:
When the remaining power of the terminal is less than the threshold, characterized in that for generating the request message,
Terminal device. A base station apparatus in a wireless communication system,
A wireless communication module for transmitting and receiving a signal with a terminal; And
A processor for controlling the wireless communication module and processing the signal;
The processor comprising:
Receives a request message for receiving a downlink signal in a power saving mode from one or more terminals, and for each of the one or more terminals and resource allocation information including bandwidth information for the downlink signal to each of the one or more terminals Transmitting scheduling information defining an active mode capable of transmitting the downlink signal and a standby mode waiting for transmission of the downlink signal, and repeating the active mode and the standby mode for each of the one or more terminals. Transmitting the downlink signal,
The bandwidth is allocated in units of n terminals that transmitted the request message to the base station,
The active mode duration is 1 / n seconds, the standby mode duration is characterized in that (n-1) / n seconds,
Base station device. The method of claim 11,
The scheduling information,
Characterized in that each of the one or more terminals includes timing synchronization information for transitioning to an active mode.
Base station device.

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