KR20160107014A - A method transmitting and receiving data for ultra low delay, and an apparatus therefor - Google Patents

Abstract

Disclosed are a method and an apparatus for transmitting and receiving data for an ultra-low delay in a wireless communication system. The data transmitting method for an ultra-low delay comprises the steps of: receiving a packet to be transmitted from an upper layer; determining whether the received packet corresponds to a packet for ultra-low delay communication; determining whether to apply a data encrypting method, a modulating and coding method, and a multi-antenna transmitting technique, and to apply a data re-transmitting technique, and determining at least one transmitting method of resource allocating methods, based on a determination result of the ultra-low delay communication on the received packet; and transmitting the packet according to the determined transmitting method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for transmitting and receiving data,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data (or packet) transmission in a wireless communication system, and more particularly, to a data transmission and reception technique for achieving a very low delay (ultra-low delay) in wireless communication.

Currently, LTE technology is widely used in wireless communication systems (or mobile communication systems), providing much higher data rates and lower end-to-end delays than conventional CDMA or WCDMA. In the current LTE and LTE-Advanced systems, the time from the idle state to the active state for data transmission is about 100 [ms] and 50 [ms], respectively. The time for transmitting a small packet is 10 [ms] or less.

Recently, 5G mobile communication system has been actively studied. In 5G mobile communication, the concept of Tactile Internet which enables ultra low delay communication of about 1 [ms] have. It is known that it is necessary to have an end-to-end delay of several milliseconds in order to delay the human tactile sensation naturally. When communication with such a very short delay time is enabled, a variety of new types of services can be provided based on this, and a new market will be created.

5G mobile communication aims at achieving a data transmission rate and cell throughput of about 1000 times that of current mobile communication technology. That is, both the highest data rate, throughput, and delay are expected to develop a mobile communication system that has a much higher performance than current commercial mobile communication technologies.

Therefore, in the 5G mobile communication system, a technique for increasing the data rate and a technique for achieving the ultra-low delay will be simultaneously considered. These two aspects are highly correlated, and the two goals have characteristics that are incompatible with each other.

Of the 5G mobile communication services, services requiring ultra low-delay communication need to transmit small amounts of data in a short time, rather than transmitting a large amount of data in most cases. However, when an ultra-low delay is not required, a data rate is high and a communication characteristic with little error is required.

In the current mobile communication system, the transmission process is handled without any special distinction between an application requiring ultra-low delay and an application not requiring ultra-low delay. However, in order to achieve ultra-low latency, it is necessary to separately process a transmission process when an ultra-low delay is required by dividing a packet by application. Also, in order to operate the ultra low delay transmission process and the general packet transmission in one system, the transmission scheme in the existing mobile communication system should be complemented.

It is an object of the present invention to solve the above problems and to provide a wireless communication system capable of simultaneously providing a low transmission rate and a low error rate communication and an ultra low delay communication in a wireless communication system in order to achieve a very low delay And an apparatus and method for transmitting and receiving data for ultra low delay.

According to another aspect of the present invention, there is provided a method of transmitting data for ultra low delay in a wireless communication system, the method comprising: receiving a packet to be transmitted from an upper layer; Determining whether the received packet corresponds to a packet for ultra-low delay communication; A modulation and coding scheme, a multi-antenna transmission scheme, a data retransmission scheme, and a resource allocation scheme for the received packet, based on a determination result of the ultra low delay communication for the received packet Determining one or more transmission schemes; And transmitting the packet according to the determined transmission scheme.

The step of determining whether the received packet corresponds to a packet for ultra-low delay communication comprises the steps of: determining header information of the received packet to determine whether the received packet corresponds to a packet for ultra-low delay communication .

The determining of the transmission mode may include using an encryption algorithm having a delay less than that of a general packet or using an encryption algorithm that is less delay than a general packet when the packet corresponds to a packet for ultra- The data encryption method can be determined.

In the case where the packet corresponds to a packet for ultra-low latency communication, the determining of the transmission scheme may include a modulation scheme having a relatively low modulation class or a low channel code rate May determine the modulation and coding scheme for the packet so as to achieve ultra-low delay.

The determining of the transmission scheme may include transmitting a transmission scheme that does not apply the multi-antenna transmission scheme or has less complexity and delay than a general packet when the packet corresponds to a packet for ultra-low-latency communication You can decide.

The determining of the transmission scheme may include determining that the retransmission scheme is not applicable when the packet corresponds to a packet for ultra-low delay communication, or determining a scheme having a low complexity and a low delay time among the retransmission schemes .

In the case where the packet corresponds to a packet for ultra-low-delay communication, the step of determining the transmission scheme may include allocating resources for the packet in advance to reduce a resource scheduling time and an overhead .

Here, the method of transmitting a packet for ultra-low delay may further include transmitting control information including a determination result of the ultra low delay communication and information on the determined transmission scheme.

According to another aspect of the present invention, there is provided a method of receiving data for ultra-low delay in a wireless communication system, comprising: receiving control information on data to be received from a counterpart station; Determining, based on the received control information, whether the data to be received corresponds to a packet for ultra-low delay communication; And receiving the data according to an ultra low delay reception method when the data to be received corresponds to a packet for ultra-low delay communication, in case of a packet for the ultra low delay communication.

Here, the control information may include at least one of the resource allocation information, the transmission mode information, the transmission format information, and the determination information about the ultra low delay communication for the data.

According to another aspect of the present invention, there is provided a data transmission apparatus for ultra low latency in a wireless communication system, comprising: an interface for receiving a packet to be transmitted from an upper layer; Determining whether or not the received packet corresponds to a packet for ultra-low delay communication, and determining whether a data encryption method, a modulation and coding scheme, a multi-antenna transmission scheme, a retransmission A memory for storing program codes for determining at least one of a transmission method and a resource allocation method; And using the program code stored in the memory to determine whether the received packet corresponds to a packet for ultra-low delay communication, and based on the determination result of the ultra low delay communication, the data encryption method, the modulation and coding And a resource allocation method, and the interface unit may transmit the packet according to the determined transmission scheme. The method of claim 1, wherein the at least one transmission scheme is one of a transmission scheme, a retransmission scheme, and a resource allocation scheme.

Here, the processor may determine header information of the received packet to determine whether the received packet corresponds to the packet for the ultra low-latency communication.

Here, when the packet corresponds to a packet for ultra-low delay communication, the processor may determine a data encryption method for the packet so as to use an encryption algorithm having a relatively smaller delay than a general packet or to not apply an encryption algorithm have.

Here, when the packet corresponds to a packet for ultra-low-delay communication, the processor is configured to transmit the ultra low-delay communication through a modulation scheme having a relatively low modulation class or a low channel code rate, The modulation and coding scheme for the packet can be determined.

Here, when the packet corresponds to a packet for ultra-low delay communication, the processor can determine a transmission scheme in which the multi-antenna transmission scheme is not applied or the complexity and delay are relatively small compared to a general packet.

Here, the processor may determine that the retransmission technique is not applied when the packet corresponds to a packet for ultra-low delay communication, or may determine a scheme having a low complexity and a low delay time among the retransmission techniques.

Here, the processor may determine to allocate resources for the packet in advance in order to reduce a resource scheduling time and an overhead when the packet corresponds to a packet for ultra-low delay communication.

Here, the processor may control to transmit control information including the determination result of the ultra low-latency communication and information on the determined transmission scheme.

According to another aspect of the present invention, there is provided an apparatus for receiving ultra low-latency packets in an ultra-low latency wireless communication system, comprising: an interface unit for receiving control information on data to be received from a correspondent station; Determining whether the data to be received corresponds to a packet for ultra-low delay communication based on the received control information, and receiving the data according to an ultra low delay receiving method when the packet is for the ultra low delay communication A memory for storing the program code; And using the program code stored in the memory to determine, based on the received control information, whether the data to be received corresponds to a packet for ultra-low delay communication, and when the packet is the ultra low delay communication, And controlling the reception of the data according to the reception method.

Here, the control information may include at least one of the resource allocation information, the transmission mode information, the transmission format information, and the determination information on the ultra low delay communication for the data.

According to the present invention, it is possible to simultaneously support a service requiring a very low delay characteristic and a general type of high-speed data transmission in a wireless communication system.

In the next generation wireless communication system, various new services based on ultra low delay transmission can be provided. That is, according to the present invention, there is a high possibility that it will be commercialized considering 5G, which is a next generation wireless communication system. Accordingly, the intelligent transportation system (for example, rapid control of all involved vehicles in the event of an unexpected event on the road, minimizing accident damage), intelligent air navigation systems, real-time hands-on games, real- (For example, quick initial response in the event of a disaster, and real-time control to prevent large-scale accidents), and an intelligent production system, a smart grid, Real-time interactive training, sports, health & care, and so on.

1 is a block diagram illustrating one embodiment of a station performing methods in accordance with the present invention.
2 is a reference diagram illustrating a network environment of a wireless communication system according to the present invention.
FIG. 3 is a flowchart illustrating a data transmission method for an ultra low delay (ULD) according to an embodiment of the present invention.
4 is a reference diagram illustrating a frame structure of a packet received from an upper layer.
5 is a flowchart illustrating an exemplary method of receiving data for Ultra Low Latency (ULD) according to an embodiment of the present invention.
6 is a block diagram of an embodiment of a data transmission apparatus for ultra low delay (ULD) according to the present invention.
7 is a block diagram of an embodiment of a data receiving apparatus for ultra low delay (ULD) according to the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

Throughout the specification, the network can be, for example, a wireless Internet such as WiFi (wireless fidelity), a wireless broadband internet (WiBro) or a portable internet such as world interoperability for microwave access (WiMax) A 3G mobile communication network such as Wideband Code Division Multiple Access (WCDMA) or CDMA2000, a high speed downlink packet access (HSDPA), or a high speed uplink packet access (HSUPA) A 3.5G mobile communication network, a 4G mobile communication network such as an LTE (Long Term Evolution) network or an LTE-Advanced network, and a 5G mobile communication network.

Throughout the specification, a terminal is referred to as a mobile station, a mobile terminal, a subscriber station, a portable subscriber station, a user equipment, an access terminal, And may include all or some of the functions of a terminal, a mobile station, a mobile terminal, a subscriber station, a mobile subscriber station, a user equipment, an access terminal, and the like.

Here, a desktop computer, a laptop computer, a tablet PC, a wireless phone, a mobile phone, a smart phone, a smart watch, e-book reader, portable multimedia player (PMP), portable game machine, navigation system, smart phone, smart watch, smart glass, automobile embedded computer, unmanned airplane communication device, A digital camera, a digital camera, a digital multimedia broadcasting (DMB) player, a digital audio recorder, a digital audio player, a digital picture recorder, a digital picture recorder, player, a digital video recorder, a digital video player, or the like.

Throughout the specification, a base station is referred to as an access point, a radio access station, a node B, an evolved node B, a base transceiver station, an MMR mobile multihop relay) -BS, and may include all or some of the functions of a base station, an access point, a radio access station, a Node B, an eNodeB, a base transceiver station, and a MMR-BS.

1 is a block diagram illustrating one embodiment of a station performing methods in accordance with the present invention.

Referring to FIG. 1, a station 100 may include at least one processor 110, a memory 120, and a network interface device 130 for communicating with a network. In addition, the station 100 may further include an input interface device 140, an output interface device 150, a storage device 160, and the like. Each component included in the station 100 may be connected by a bus 170 and communicate with each other.

The processor 110 may execute a program command stored in the memory 120 and / or the storage device 160. The processor 110 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the methods of the present invention are performed. The memory 120 and the storage device 160 may be composed of a volatile storage medium and / or a non-volatile storage medium. For example, memory 120 may be comprised of read only memory (ROM) and / or random access memory (RAM).

2 is a reference diagram illustrating a network environment of a wireless communication system according to the present invention. 2, the base station 210 is connected to the core network 200, and the mobile station 220 (for example, a mobile communication terminal) exists within the coverage of the base station 210. The packet transmission apparatus and the receiving apparatus for ultra low delay according to the present invention may be a base station 210 or a mobile station 220. [

FIG. 3 is a flowchart illustrating a data transmission method for an ultra low delay (ULD) according to an embodiment of the present invention.

A packet to be transmitted is received from an upper layer (S300). Here, the upper layer may be the core network 200 on the side of the base station 210, or may be the base station 210 on the mobile station 220 side.

After step S300, it is determined whether the received packet corresponds to a packet for ultra-low delay communication (S302). For ultra low latency communication, application level, that is, packets requiring ultra low delay communication provided in upper layer, should be distinguished from general packet. For this, the header information of the received packet can be checked to determine whether the packet corresponds to a packet for ultra-low delay communication.

4 is a reference diagram illustrating a frame structure of a packet received from an upper layer. The frame structure of the packet 400 includes a header 410 and transmission data 420. The header 410 includes an ultra low delay identifier 414 along with header information 412. The header information 412 has information such as an address of a receiving station or a transmitting station of the packet 400, a line quality, and the like. In particular, the header 410 includes an ultra low delay identifier 414 for indicating that the packet is for ultra-low delay. By checking the ultra-low delay identifier 414, it is possible to determine whether the packet is a packet for ultra-low delay.

After step S302, based on the determination result of the ultra low delay communication for the received packet, at least one of a data encryption scheme, a modulation and coding scheme, a multi-antenna transmission scheme, and a data retransmission scheme are applied One or more transmission modes are determined (S304).

It is necessary to separate and transmit the packets in order to perform effective transmission according to characteristics of packets or general packets for ultra-low delay. That is, when ultra-low delay communication is required, relatively small packets must be transmitted quickly. In the case of a general packet that does not require ultra low delay communication, a high transmission rate and a low error rate should be transmitted.

When the received packet corresponds to a packet for ultra-low delay communication, for example, a packet used for an intelligent traffic system, a packet for a real-time game, a packet for real-time remote control, Packets for grid, packets for public goods, packets for real-time interactive training, packets for sports or healthcare, and so on. These packets are characterized in that their packet sizes are relatively small as compared with general packets.

In step S302, when the received packet corresponds to a packet for ultra-low delay communication, a data encryption method using an encryption algorithm having a delay relatively less than that of a general packet is determined. Data encryption or integrity protection uses an algorithm that has less latency than regular packets. In some cases, if encryption is not necessary, the encryption and integrity checking process is skipped.

If the received packet corresponds to a packet for ultra-low latency communication, a modulation order or a channel code rate is relatively lower than a modulation and coding scheme in transmission of a general packet, To determine the modulation and coding scheme for the packet to achieve ultra-low delay. When performing link adaptation that adjusts the modulation and channel code rate according to the current channel condition, it uses lower modulation or lower channel code rate than the currently available mode to reliably send data at a time. That is, according to the delay value required for the CQI (Channel Quality Indicator) value reflecting the channel state, the same offset can be applied differently so that even if the data transmission rate is low, the data can be stably transmitted without any error so that a delay due to retransmission does not occur .

If it is determined in step S302 that the received packet corresponds to a packet for ultra low-latency communication, it may be determined that the multi-antenna transmission scheme is not applied. That is, a multi-antenna technique such as spatial multiplexing or beamforming requiring precoding is selectively determined. If multi-antenna technology can be applied to satisfy the delay requirement, it can be applied to improve the transmission quality. If the delay requirement is too high to require a very short delay and the signal processing time for multi-antenna transmission needs to be reduced, To be able to do so. In addition, when the delay requirement is high, the delay time is short due to the use of multiple antennas by applying a diversity technique using multiple antennas rather than applying spatial multiplexing or beamforming, which may increase the delay time due to high complexity, And techniques for improving performance can be applied.

If the received packet corresponds to a packet for ultra-low latency communication, it is determined whether the retransmission technique is not applied or a low complexity scheme (for example, CC (Chase Combining) Method, etc.) may be applied. For example, in the case of H-ARQ using soft combining, the performance is relatively inferior to the IR (Incremental Redundancy) method, which has good performance and high complexity, but CC (Chase Combining) with low complexity can be determined. Retransmission such as Hybrid ARQ (H-ARQ) can be selectively applied, so that transmission is performed without applying HARQ when ultra-low delay is required. Alternatively, the algorithm for performing HARQ is simple, and the CC (Chase Combining) algorithm with low delay is complex and the IR (Incremental Redundancy) with high error rate has high performance. As shown in FIG.

If it is determined in step S302 that the received packet corresponds to a packet for the ultra low-latency communication, it is determined to allocate resources for the packet in advance. Also, in the scheduling process of allocating the radio resources, the resource for the low delay packet is allocated in advance so as to achieve the ultra-low delay, thereby reducing the time required for resource allocation. In this case, the resource is distributed to the entire frequency band so as to obtain a frequency diversity effect, or the frequency is shifted using a predetermined frequency hopping pattern.

On the other hand, in step S302, the general transmission mode is determined based on the determination result of the ultra low delay communication for the received packet (S306). If it is determined in step S302 that the received packet does not correspond to a packet for ultra-low delay communication, the packet is regarded as a general packet and the packet is determined to be transmitted according to the general transmission scheme.

In the case of a general packet, not a packet for ultra-low delay, it decides to perform data encryption or integrity protection even if there is a delay. Also, the modulation order and the code rate are determined according to the modulation and coding scheme at the time of general packet transmission. In general packet transmission, it is determined that multi-antenna techniques such as spatial multiplexing and beamforming, which require precoding according to channel conditions, can be applied. Also, when a general packet is transmitted, the retransmission technique is determined to be applied. For example, among the retransmission schemes, retransmission schemes such as IR (Incremental Redundancy), which have high complexity and delay but high performance against error rate, can be determined among algorithms that perform HARQ.

After step S304 or step S306, control information including the determination result of the ultra low delay communication and information on the determined transmission scheme is transmitted to the destination node (S308). Here, the control information includes resource allocation information, transmission mode information, transmission format information, determination information on ultra low delay communication, and the like for a packet to be transmitted. For example, in the case of LTE communication, control information corresponding to the ultra-low delay can be transmitted to the PDCCH. In addition, in the case of LTE-Advanced, it can be transmitted including the corresponding control information in the E-PDCCH. Accordingly, the destination node, that is, the receiver receiving the control information, operates in the ultra low delay receiving mode.

After step S308, the packet is transmitted to the destination node according to the determined transmission scheme (S308). And transmits the packet to the destination node according to the determination result of the data encryption scheme, the modulation and coding scheme, the application of the multi-antenna transmission scheme, and the application of the data retransmission scheme to the received packet.

5 is a flowchart illustrating an exemplary method of receiving data for an ultra low delay (ULD) according to an embodiment of the present invention.

Control information on data to be received is received from the counterpart station (S500). Here, the correspondent station may correspond to the core network 200, the base station 210, or the like. The received control information may include resource allocation information on the data to be received, transmission mode information, transmission format information, determination information on ultra low-delay communication, and the like.

After step S500, it is determined based on the received control information whether the data to be received corresponds to a packet for ultra-low delay communication (S502). It is determined whether the data to be received corresponds to a packet for ultra-low delay communication based on the determination information on the ultra low delay communication included in the control information.

If the data to be received corresponds to a packet for ultra-low delay communication, the data is received according to the ultra low delay reception method (S504). And receives the data according to a control scheme, that is, a reception scheme corresponding to transmission for ultra-low delay such as encryption, modulation and coding scheme of data to be received, application of multi-antenna transmission scheme, and application of data retransmission scheme. For example, if the data to be received corresponds to a packet for ultra-low latency communication, the process of data encryption or integrity protection at the time of data transmission is omitted or simplified, and a low modulation order or low channel code Rate and then transmitted. In the case of a packet for ultra-low delay communication, a multi-antenna technique such as spatial multiplexing or beamforming is not applied, and a retransmission technique is not applied or a method of low complexity (for example, CC (Chaser Combining)) Retransmission is done. Therefore, it is possible to perform decoding on the data encrypted and transmitted according to the encryption scheme of the packet for the ultra-low delay communication, and to transmit the modulated and coded data by the low modulation order and the low channel code rate of the packet for ultra low- Lt; / RTI >

If it is determined in step S502 that the received packet does not correspond to a packet for the ultra low delay communication, the general packet reception procedure for the packet is performed (S508). If the received packet does not correspond to a packet for ultra-low delay communication, it is regarded as a general packet. In the case of a general packet, not a packet for ultra-low delay, a data encryption or integrity protection process is performed at the time of transmission, and modulation and coding are performed by a modulation order and a code rate corresponding to a general packet Lt; / RTI > Also, in general packet transmission, multiple antenna technology such as Spatial multiplexing or Beamforming, which requires precoding, is applied, or a scheme in which HARQ is performed in a retransmission scheme, a method of improving the error rate (e.g., Incremental Redundancy )).

Therefore, the packet is decrypted according to the encryption method of the general packet, and demodulates and decodes the data modulated and coded by the modulation order and the code rate corresponding to the general packet. In addition, a multi-antenna technique is applied to receive the transmitted general packet and receive the packet transmitted by the retransmission technique.

6 is a block diagram of an embodiment for explaining a data transmission apparatus 600 for Ultra Low Latency (ULD) according to the present invention, which includes an interface unit 610, a memory 620, and a processor 630.

The interface unit 610 receives a packet to be transmitted from an upper layer. To this end, the interface unit 610 is connected to the upper layer via a wired or wireless network. The wireless network may use at least one of LTE, LTE-Advanced, CDMA, WCDMA, UMTS, WiBro, or GSM as the cellular communication protocol. It may also be a new wireless access technology for 5G mobile communication.

The memory 620 determines whether the received packet corresponds to a packet for ultra-low delay communication, and based on the determination result of the ultra low delay communication, the memory 620 transmits a data encryption method, a modulation and coding scheme, A retransmission scheme, a resource allocation scheme, a retransmission scheme, and a resource allocation scheme.

The processor 630 uses the program code stored in the memory 620 to determine whether the received packet corresponds to a packet for ultra-low delay communication. 4, the frame structure of the packet 400 includes a header 410 and transmission data 420. [ The header 410 may include an ultra low delay identifier 414 along with header information 412. The header information 412 has information such as an address of a receiving station or a transmitting station of the packet 400, a line quality, and the like. In particular, the header 410 includes an ultra low delay identifier 414 for indicating that the packet is for ultra-low delay. Accordingly, the processor 630 can determine whether the packet is a packet for ultra-low delay by checking the ultra low delay identifier 414 of the header 410. [

The processor 630 analyzes the program code stored in the memory 620 based on the determination result of the ultra low delay communication or not, and determines whether the data encryption method, modulation and coding scheme, application of the multi-antenna transmission scheme, Determine the transmission mode.

The processor 630 determines a data encryption method using an encryption algorithm with a relatively low delay than a general packet when a packet to be transmitted corresponds to a packet for ultra-low delay communication. That is, the processor 630 decides to use an algorithm with less delay than the normal packet in data encryption or integrity protection. In addition, the processor 630 decides to omit the encryption and integrity checking process when it is not necessary to encrypt.

In addition, when the packet to be transmitted corresponds to a packet for ultra-low delay communication, the processor 630 transmits a relatively low modulation order and a low channel code rate, The modulation and coding scheme for the packet is determined. The processor 630 applies a modulation and coding scheme for a packet differently according to a delay value required for a CQI (Channel Quality Indicator) value reflecting the channel state so as to have a relatively low modulation order and a code rate, The speed is determined to be transmitted stably at a time without error even when the speed is low.

In addition, when the packet to be transmitted corresponds to a packet for ultra-low delay communication, the processor 630 may determine that the multi-antenna transmission scheme is not applied or use a multi-antenna transmission scheme such as diversity with low complexity and low delay It can decide to transmit the packet. The processor 630 selectively determines a multiple antenna technique, such as spatial multiplexing or beamforming, in which precoding is required. If multi-antenna technology can be applied to satisfy the delay requirement, it can be applied to improve the transmission quality. If the delay requirement is too high, a very short delay is required and the signal processing time for multi-antenna transmission need to be reduced Decide to communicate.

In addition, when the packet to be transmitted corresponds to a packet for ultra-low delay communication, the processor 630 determines that the retransmission technique is not applied or determines that a CC (Chase Combining) scheme having a low complexity is applied to the retransmission technique do. For example, the processor 630 determines to transmit without applying HARQ if an ultra-low delay is required. Alternatively, the processor 630 may be configured to select one of a variety of algorithms, such as CC (Chase Combining) with a simple algorithm and low delay, an IR (Incremental Redundancy) algorithm with complexity and high delay, So that it can operate.

In addition, when the packet to be transmitted corresponds to a packet for ultra-low delay communication, the processor 630 determines to allocate resources for the packet in advance. The processor 630 may allocate a resource for the low delay packet in advance to reduce the time required for resource allocation so that ultra low delay can be achieved even in a scheduling process of allocating radio resources. In this case, in order to obtain a frequency diversity effect, the processor 630 distributes the resources to the entire frequency band or transmits the frequency by moving the frequency using a predetermined frequency hopping pattern.

In addition, the processor 630 controls to transmit control information including the determination result of the ultra-low delay communication and the determined transmission mode to the destination node. Here, the control information includes resource allocation information, transmission mode information, transmission format information, determination information on ultra low delay communication, and the like for a packet to be transmitted. Accordingly, the interface unit 610 transmits the control information including the determination result of the ultra low-latency communication and the determined transmission mode to the destination node.

Thereafter, the interface unit 610 transmits the packet to the destination node based on the determined transmission scheme, under the control of the processor 630. [ The interface unit 610 transmits the packet to the destination node in accordance with the determination result of the data encryption scheme, the modulation and coding scheme, the application of the multi-antenna transmission scheme, and the application of the data retransmission scheme to the packet.

7 is a block diagram of an embodiment for explaining a data receiving apparatus 700 for Ultra Low Latency (ULD) according to the present invention, and includes an interface unit 710, a memory 720, and a processor 730.

The interface unit 710 receives control information on data to be received from the counterpart station. To this end, the interface unit 710 is connected to the packet transmission device 600 for ultra low delay (ULD) by a wired or wireless network. The received control information includes resource allocation information for the packet to be transmitted, transmission mode information, transmission format information, and determination information on whether to perform ultra low delay communication or the like.

The memory 720 determines, based on the received control information, whether the data to be received corresponds to a packet for ultra-low delay communication, and when the packet is for the ultra low-delay communication, And stores the program code for reception.

The processor 730 uses the program code stored in the memory 720 to determine, based on the received control information, whether the data to be received corresponds to a packet for ultra-low delay communication, And receives the data according to the ultra low delay reception method. The processor 730 receives the control information, that is, the data to be received, the modulation and coding scheme, whether or not the multi-antenna transmission scheme is applied, and whether the data retransmission scheme is applied, . For example, if the data to be received corresponds to a packet for ultra-low latency communication, the process of data encryption or integrity protection at the time of data transmission is omitted or simplified, and a low modulation order or low channel code Rate and then transmitted. In the case of a packet for ultra-low latency communication, a multi-antenna technique such as spatial multiplexing or beamforming is not applied, a retransmission technique is not applied, or a method (e.g., CC (Chase Combining) . Accordingly, the processor 730 performs decoding on the data encrypted and encrypted according to the encryption scheme of the packet for the ultra low-latency communication, and decodes the data by the low modulation order and the low channel code rate of the packet for ultra low- Demodulate and decode the modulated and coded data.

The methods according to the present invention can be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention or may be available to those skilled in the computer software.

Examples of computer readable media include hardware devices that are specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

610 and 710:
620, 720: memory
630, 730: Processor

Claims (20)

A method for transmitting data for ultra-low latency in a wireless communication system,
Receiving a packet to be transmitted from an upper layer;
Determining whether the received packet corresponds to a packet for ultra-low delay communication;
A modulation and coding scheme, a multi-antenna transmission scheme, a data retransmission scheme, and a resource allocation scheme for the received packet, based on a determination result of the ultra low delay communication for the received packet Determining one or more transmission schemes; And
And transmitting the packet according to the determined transmission scheme. The method of claim 1, wherein determining whether the received packet corresponds to a packet for ultra-low latency communication comprises:
And determining whether the received packet corresponds to a packet for ultra-low delay communication by checking header information of the received packet. The method of claim 1, wherein determining the transmission scheme comprises:
When the packet corresponds to a packet for ultra-low delay communication, a data encryption method for the packet is determined so as to use an encryption algorithm having a delay less than that of a general packet or to not apply an encryption algorithm. A method of transmitting data for ultra low delay. The method of claim 1, wherein determining the transmission scheme comprises:
When the packet corresponds to a packet for ultra-low delay communication, the transmission rate of the packet is lower than the modulation and coding scheme at the time of transmission of the general packet, Wherein a modulation and coding scheme for the packet is determined. The method of claim 1, wherein determining the transmission scheme comprises:
When the packet corresponds to a packet for ultra-low delay communication, determines a transmission scheme in which the multi-antenna transmission scheme is not applied or a complexity and a delay are less than those of a general packet. Transmission method. The method of claim 1, wherein determining the transmission scheme comprises:
Determining whether the retransmission technique is not applied when the packet corresponds to a packet for ultra-low delay communication, or determining a low complexity scheme among the retransmission techniques. The method of claim 1, wherein determining the transmission scheme comprises:
Wherein when the packet corresponds to a packet for ultra-low delay communication, it is determined to allocate resources for the packet in advance in order to reduce a resource scheduling time and an overhead. Data transmission method. 2. The method of claim 1,
Further comprising transmitting control information including a determination result of the ultra low delay communication and information on the determined transmission scheme. A method of receiving data for ultra-low latency in a wireless communication system,
Receiving control information on data to be received from a counterpart station;
Determining, based on the received control information, whether the data to be received corresponds to a packet for ultra-low delay communication; And
And receiving the data according to an ultra low delay receiving method when the data to be received is a packet for the ultra low delay communication according to whether the data to be received corresponds to a packet for ultra low delay communication . The method of claim 9,
And determining information on resource allocation information, transmission mode information, transmission format information, and ultra low delay communication for the data. A data transmission apparatus for ultra low delay in a wireless communication system,
An interface unit for receiving a packet to be transmitted from an upper layer;
Determining whether or not the received packet corresponds to a packet for ultra-low delay communication, and determining whether a data encryption method, a modulation and coding scheme, a multi-antenna transmission scheme, a retransmission A memory for storing program codes for determining at least one of a transmission method and a resource allocation method; And
Determining whether the received packet corresponds to a packet for ultra-low delay communication using the program code stored in the memory, and determining whether the received packet corresponds to a packet for ultra-low delay communication, And determining a transmission scheme of at least one of whether to apply the multi-antenna transmission scheme, whether to apply the retransmission scheme, and the resource allocation scheme,
And the interface transmits the packet according to the determined transmission scheme. 12. The system of claim 11,
And determines whether the received packet corresponds to the packet for the ultra low delay communication by checking the header information of the received packet. 12. The system of claim 11,
Wherein when the packet corresponds to a packet for ultra-low delay communication, a data encryption method for the packet is determined so as to use an encryption algorithm having a delay less than that of a general packet or to not apply an encryption algorithm. Lt; / RTI > 12. The system of claim 11,
When the packet corresponds to a packet for ultra-low delay communication, the transmission rate of the packet is lower than the modulation and coding scheme at the time of transmission of the general packet, And determines a modulation and coding scheme for the packet. 12. The system of claim 11,
Wherein when the packet corresponds to a packet for ultra-low latency communication, a transmission scheme in which the multi-antenna transmission scheme is not applied or the complexity and delay are relatively small compared to a general packet is determined. Device. 12. The system of claim 11,
Wherein when the packet corresponds to a packet for ultra-low delay communication, the retransmission scheme is not applied or a scheme having a low complexity is determined from the retransmission scheme. 12. The system of claim 11,
Wherein when the packet corresponds to a packet for ultra-low delay communication, it is determined to allocate resources for the packet in advance in order to reduce a resource scheduling time and an overhead. Data transfer device. 12. The system of claim 11,
Wherein the controller is configured to transmit control information including a determination result of the ultra low delay communication and information on the determined transmission scheme. A data receiving apparatus for ultra low delay in a wireless communication system,
An interface unit for receiving control information on data to be received from a counterpart station;
Determining whether the data to be received corresponds to a packet for ultra-low delay communication based on the received control information, and receiving the data according to an ultra low delay receiving method when the packet is for the ultra low delay communication A memory for storing the program code; And
Determining whether the data to be received corresponds to a packet for ultra-low delay communication based on the received control information using the program code stored in the memory, And a processor for controlling the reception of the data according to a method. 21. The method of claim 19,
And determining information on resource allocation information, transmission mode information, transmission format information, and ultra low delay communication for the data.

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