KR101693324B1 - Methods and Apparatuses for transmitting/receiving Data with low latency - Google Patents

Methods and Apparatuses for transmitting/receiving Data with low latency Download PDF

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Publication number
KR101693324B1
KR101693324B1 KR1020150182722A KR20150182722A KR101693324B1 KR 101693324 B1 KR101693324 B1 KR 101693324B1 KR 1020150182722 A KR1020150182722 A KR 1020150182722A KR 20150182722 A KR20150182722 A KR 20150182722A KR 101693324 B1 KR101693324 B1 KR 101693324B1
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South Korea
Prior art keywords
resource
resource region
data
transmission
remote node
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KR1020150182722A
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Korean (ko)
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KR20160083800A (en
Inventor
문희찬
유인길
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한양대학교 산학협력단
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/14Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel using a grant or specific channel
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2612Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/0406Wireless resource allocation involving control information exchange between nodes
    • H04W72/042Wireless resource allocation involving control information exchange between nodes in downlink direction of a wireless link, i.e. towards terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/1278Transmission of control information for scheduling
    • H04W72/1289Transmission of control information for scheduling in the downlink, i.e. towards the terminal
    • H04W72/1294Transmission of control information for scheduling in the downlink, i.e. towards the terminal using a grant or specific channel

Abstract

The present invention relates to a method and apparatus for transmitting / receiving data in a low-latency manner in a wireless communication system, and more particularly, to a host node controlling a wireless resource including a first resource region and a second resource region according to an embodiment of the present invention, Includes a step in which a remote node receives resource information of a first resource region from a host node, and a step in which a remote node transmits a signature and data using resource information to a host node in a first resource region.

Description

METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA TO LOW DELAYS IN A WIRELESS COMMUNICATION SYSTEM

The present invention relates to a method and an apparatus for transmitting / receiving data with a low transmission delay, which eliminates delays such as channel setting in transmitting / receiving data in a wireless communication system.

In a mobile communication system such as W-CDMA, LTE, LTE-Advanced or 3GPP2 cdma2000 of 3GPP, a remote node such as a terminal allocates resources to data to be transmitted by a terminal in order to perform communication with a host node such as a base station, send. To do this, it is necessary to establish a dedicated connection between the host node and the remote node, which requires a certain amount of time to establish a dedicated connection. On the other hand, in the case of terminals that mainly transmit and receive data of a small size, data to be transmitted and received in a process of establishing a dedicated connection may be larger than the size of data to be transmitted actually. This has a problem in that not only the efficiency of data transmission and reception of the remote node is lowered but also the radio resources controlled by the host node are wasted.

A method for a remote node to transmit data to a host node that controls a wireless resource including a first resource region and a second resource region according to an embodiment of the present invention is a method in which a remote node transmits resource information of a first resource region to a host node And transmitting the signature and data using the resource information from the remote node to the host node in the first resource area.

A method for receiving data from a remote node, which controls a wireless resource including a first resource area and a second resource area, according to another embodiment of the present invention is a method in which a host node transmits resource information of a first resource area to a remote node And the host node receives the signature and data from the remote node in the first resource region, and the signature and data are generated using the resource information.

According to another aspect of the present invention, there is provided a remote node comprising: a receiving unit for receiving resource information of a first resource region from a host node; a control unit for generating a signature and data using resource information; The control unit controls the transmitting unit to transmit data in the first resource area or the second resource area. The first resource area is a resource area allocated for one-shot transmission, And the second resource region is a resource region allocated for PUSCH (Physical Uplink Shared CHannel) transmission.

According to another embodiment of the present invention, a host node includes a controller for generating resource information of a first resource region, a transmitter for transmitting generated resource information to a remote node, and a receiver for receiving a signature and data in the first resource region The control unit controls the receiving unit to receive data in the first resource area or the second resource area, the first resource area is a resource area allocated for one-shot transmission, and the second resource area Is a resource area allocated for PUSCH (Physical Uplink Shared CHannel) transmission.

1 is a diagram illustrating a transmission process through a contention based access (CBA) method.
2 is a diagram illustrating an uplink resource grid structure of an LTE system to which the present invention can be applied.
FIG. 3 is a diagram illustrating a structure of resources allocated to a subframe according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a configuration of a radio resource in which the RACH and the first resource region are alternately arranged according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating a configuration of a radio resource in which a first resource region and a RACH are arranged at a ratio of 2: 1 according to another embodiment of the present invention.
6 is a diagram illustrating a frame structure for time-division transmission for one shot transmission according to an embodiment of the present invention.
7 is a diagram illustrating a frame structure for transmission of a code division scheme for one shot transmission according to another embodiment of the present invention.
8 is a diagram illustrating a configuration of a subframe in which two types of transmission are performed in a first resource region according to an embodiment of the present invention.
9 is a flowchart illustrating an operation of a host node according to an embodiment of the present invention.
10 is a flowchart illustrating an operation of a remote node in a one-shot transmission according to an embodiment of the present invention.
11 is a diagram illustrating a process in which signature demodulation fails according to an embodiment of the present invention.
FIG. 12 is a diagram illustrating a process when data demodulation fails according to another embodiment of the present invention.
13 is a diagram illustrating a process in which a host node and a remote node share information of a first resource region according to an embodiment of the present invention.
FIG. 14 is a diagram illustrating a configuration of a host node according to another embodiment.
15 is a diagram illustrating a configuration of a remote node according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In this specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) a device itself providing a megacell, a macrocell, a microcell, a picocell, a femtocell, or a small cell in relation to a wireless region, or ii) the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a megacell, a macrocell, a microcell, a picocell, a femtocell, a small cell, an RRH, an antenna, an RU, a low power node (LPN), a point, an eNB, Quot;

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In a system such as LTE and LTE-A, the uplink and downlink are configured based on one carrier or carrier pair to form a standard. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmission / reception points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multiplex transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiplex transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to the portion described with PDCCH, and EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

Hereinafter, the host node and the remote node will be mainly described. Examples of the host node include a base station, an eNB, and the like. One embodiment of the remote node corresponds to a user terminal, an MTC terminal, or the like.

a host node such as an eNB performs downlink transmission to the UEs, and also performs physical downlink shared channel (PDSCH), which is a main physical channel for unicast transmission, and PDSCH A physical downlink control channel for transmitting scheduling grant information for transmission in downlink control information such as scheduling and uplink data channel (for example, physical uplink shared channel (PUSCH)), Downlink Control Channel (PDCCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

Wireless communication technologies are being developed variously according to their application fields. One of the most important goals to achieve in the field of mobile communication systems is low-delay communication. The technology for low-delay communication has a characteristic that the physical layer and the upper layer must be considered at the same time.

Currently, many wireless communication systems are based on packet data for efficient use of the network. In the packet data based wireless communication, the communication method between the host node and the remote node is roughly classified into a transmission using a dedicated channel and a transmission using a random access channel. Both methods are used for different purposes depending on each feature. Generally, setting up a dedicated channel requires a complex process (eg protocol settings). Therefore, it is effective to use a dedicated channel when transmitting a large amount of data, and to use a random access channel when transmitting a large amount of data occurring in a low cycle.

In the 3GPP LTE system, the host node transmits only the preamble as an access probe to the random access channel. The remote node allocates a dedicated channel from the host node and transmits data through it. In this case, there is no big problem in terms of transmission delay when dedicated connection is already established. However, if a dedicated connection is not established, there is a relatively large delay because a dedicated connection must be established each time data is transmitted. In particular, when transmitting a large amount of data occurring in a low cycle, a large inefficiency occurs in terms of transmission delay.

With the development of wireless communication technology, many application services requiring low latency have been realized, and it has been difficult to cope with the delay performance required by the existing methods. Therefore, various studies for low delay communication have been proposed.

FIG. 1 is a diagram illustrating a transmission process through a contention based access (CBA) method.

1 (a) shows a process in which a remote node allocates resources from a host node and transmits data and identification information. First, the remote node 101 receives a scheduling grant, that is, a scheduling grant (SG) signal from the host node 102 (S110). The SG signal received by the remote node 101 includes resource information allocated for the CBA. The remote node 101 randomly selects a resource from among the allocated resources and transmits the data Data and the cell identification code (C-RNTI) (S120). 1A, the remote node 101 receives the resource information allocated for the CBA transmitted from the host node 102 (S110), and the step (S110) of the resource allocated to the remote node 101 And transmitting the data and the cell identification code (C-RNTI) multiplexed signal to the host node 102 (S120).

FIG. 1 (b) shows a configuration of a signal transmitted in the above step S120. In step S120, data and C-RNTI are transmitted. In one embodiment, the UL-SCH encoded data 150 and the uplink MCS (modulation and coding scheme) and the C-RNTI encoding sequence 160 are combined. The resulting signal is the same structure as 170 where data and control are multiplexed.

Although the time delay can be partially reduced when data is transmitted by applying the method illustrated in FIG. 1, there is a disadvantage that overhead due to the resource information transmitted in the step of receiving the allocated resource information (S110) is large. And since the cell identification code is also transmitted with the data every transmission, it greatly increases the overhead.

The present invention relates to a random access transmission method for low delay. In the existing mobile communication system, only the preamble is transmitted in the initial random access transmission, and the additional time delay occurs because the message is not transmitted. However, in the present invention, present. The proposed method allocates a kind of sequence for random access, and this sequence functions as a conventional preamble to notify the presence of random access and a part of ID or ID. In addition, the sequence can reduce the overhead of a system by performing a channel estimation pilot function for receiving a message transmitted through a random access.

A large transmission delay caused by setting a dedicated channel when transmitting a large amount of data in a wireless communication system is solved and the efficiency of channel transmission is lowered as one remote node transmits data through a dedicated channel Solve the problem. It also overcomes the degradation of reception performance caused by incomplete power control.

In order to solve the above problem, a transmission method of a wireless communication system is proposed. This includes the structure of transmission frames, transmission and retransmission processes and methods, and methods for ensuring reception performance.

The embodiment of the present invention reduces the transmission delay by transmitting a large amount of data at one time (one shot, hereinafter referred to as "one shot"), and each remote node simultaneously transmits data to the same resource in a code division manner The efficiency of the channel transmission can be improved. At this time, by setting the performance margin in consideration of the power control, the reception performance can be secured to a certain level or more. This embodiment is also readily applicable to random access channels of a wireless communication system.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

Embodiments of the present invention can be applied to 3GPP LTE systems. The uplink of the LTE system is based on SC-FDMA. Even if OFDM is used for the uplink, the proposal of the present invention can be applied without any problem.

2 is a diagram illustrating an uplink resource grid structure of an LTE system to which the present invention can be applied. (RACH) and a Physical Uplink Shared CHannel (PUSCH), the RACH is determined according to the (P) RACH Configuration Index determined at the host node. Frame. In the case of the PUSCH 210, two pilot channels 201 are transmitted in one subframe. The remote node transmits the preamble through the RACH, and the host node that has captured the preamble assigns a dedicated channel to the corresponding remote node. The remote node transmits data through this dedicated channel. In this method, a dedicated channel is set up every time data is transmitted, and thus a large time delay occurs.

In order to solve the above-mentioned problems, the present invention proposes a method of transmitting data on one-shot without setting a dedicated channel. Through the proposed method, the transmission delay of the data can be greatly reduced. In order to reduce a data transmission delay, a method of transmitting data between a host node and a remote node without setting a dedicated channel is referred to as one-shot transmission in the present specification, but the present invention is not limited thereto.

A one-shot transmission process and a method according to an embodiment of the present invention will be described below.

FIG. 3 is a diagram illustrating a structure of resources allocated to a subframe according to an embodiment of the present invention. In the embodiment of FIG. 3, the first resource region is allocated to the radio resource region allocated to the RACH in the 3GPP LTE. The first resource area means a resource area for the one-shot transmission. The bandwidth of one shot transfer allocation resource can be set in the host node according to the value of data to be transmitted in one shot, the amount of uplink data, the number of remote nodes, and the like.

In FIG. 3, a first resource area is allocated to a subframe # 1 among 10 subframes constituting one frame. Embodiments for distributing the RACH and the first resource region on a frame-by-frame basis may vary. For example, the RACH and the first resource region can be allocated to alternate frames. In another embodiment, the frame may be set as a region for RACH in two frames, and as a first resource region for one-shot transmission in another frame. 4 and 5 in more detail. In contrast to the first resource area, dedicated channel transmission other than one shot is performed in the second resource area. Therefore, the radio resource region includes the first resource region and the second resource region, and the remote node can transmit the one-shot transmission in the first resource region or the dedicated channel in the second resource region and transmit the PUSCH.

FIG. 4 is a diagram illustrating a configuration of a radio resource in which the RACH and the first resource region are alternately arranged according to an embodiment of the present invention. An area for the RACH is allocated in the subframe # 1 of the frame 2m-1, such as frame 1, frame 3, 1, a first resource area for one-shot transmission is allocated (m is a natural number of 1 or more).

FIG. 5 is a diagram illustrating a configuration of a radio resource in which a first resource region and a RACH are arranged at a ratio of 2: 1 according to another embodiment of the present invention. An area for RACH is allocated in subframe # 1 of frame (3m-2) or frame (3m-1) such as frame 1, frame 2, frame 4, frame 5, The first resource area for one-shot transmission is allocated in the sub-frame # 1 of the frame 3m (m is a natural number of 1 or more).

4 and 5, the distribution of the RACH and the first resource region can be set in the host node according to the value of the amount of data to be transmitted in one shot, the amount of uplink data, the number of remote nodes, The number of nodes, or the amount of uplink data. 4 or 5, the host node provides information on the RACH and the first resource zone to the remote node in advance, and then, until the first resource zone is newly changed, information on the first resource zone Data can be transmitted and received in the first resource area using the second resource area.

The remote node receives the resource information (first resource region) allocated to the one-shot transmission transmitted from the host node. At this time, a certain resource is allocated to the one-shot transmission in advance, and only the changed information of the host node can be transmitted only when it is changed. In this way, one-shot transmission delay and overhead can be reduced at the same time as compared with the conventional CBA.

6 is a diagram illustrating a frame structure for time-division transmission for one shot transmission according to an embodiment of the present invention. The subframe may include two slots 611 and 612, and each slot may have 7 OFDM symbols. Of course, the number of OFDM symbols can be variously set according to the setting of the network. When a remote node performs a one-shot transmission using Time Division Multiplexing (TDM), a symbol 620 to which a signature is allocated and a symbol 630 to which data is allocated are divided into a plurality of symbols in order to distinguish between signatures and data, .

7 is a diagram illustrating a frame structure for transmission of a code division scheme for one shot transmission according to another embodiment of the present invention. In FIG. 7, the symbols constituting the slots 711 and 712 are not divided into signatures and data, and data / signatures are allocated to symbols by applying Code Division Multiplexing (CDM). For example, as in 720, the signatures to which the code 1 is applied and the data to which the code 2 is applied are combined and allocated to the symbols constituting the slots 711 and 712. Code, which is orthogonal to other signatures and data to which other code is applied and can be identified at the host node. In FIG. 7, the signature and data are divided into different codes and transmitted through the same resource.

The signatures illustrated in FIGS. 6 and 7 simultaneously perform the role of a pilot signal required for channel estimation and the role of a cell identification code. The signature uses the sequence that the host node assigns to each remote node, and the signature assigned to each remote node can be designed to have orthogonality like the preamble. Through the signatures of these characteristics, the host node can use the sequence as a cell identification code in the one-shot transmission. In this way, overhead due to overlapping of the pilot signal and the preamble can be reduced, and the overhead required for C-RNTI transmission can also be reduced by using the signature as the cell identification code.

The data is diffused and transmitted in a code division manner using the sequence inherent to each remote node allocated from the host node. At this time, a modulation and coding scheme (MCS) can be used to reduce reception performance degradation due to interference. In this way, two or more remote nodes can use the same location resources redundantly, which can improve the channel transmission efficiency compared to the conventional method.

Compared with the conventional CBA, in the conventional CBA, when two or more remote nodes simultaneously transmit to the same resource allocated at the same time, data collision failure basically occurs. Instead, the C-RNTI using the low MCS is likely to be demodulated, thereby reducing the retransmission time. On the other hand, according to the present invention, each remote node transmits data through code division so that it can be demodulated even if two or more remote nodes transmit simultaneously through the same resource. This can be one of the fundamental solutions to the collision problem.

8 is a diagram illustrating a configuration of a subframe in which two types of transmission are performed in a first resource region according to an embodiment of the present invention. FIG. 8 shows an example in which overlapping of conventional PUSCH transmission (dedicated channel connection) and one-shot transmission is permitted. In the case of CBA, as in the case of the conventional random access channel, the resource allocated to the one-shot transmission is not allowed to be transmitted to the resource allocated to the PUSCH. However, since one shot transmission occurs stochastically, there is a probability that the one shot transmission will waste resources if one shot transmission does not occur. In particular, when the amount of data transmitted in the uplink is large, it is desirable to use resources as efficiently as possible.

As shown in FIG. 8, according to an embodiment of the present invention, a method of efficiently using resources by allowing a PUSCH to be transmitted in a dedicated channel to a first resource region 810, which is a resource already allocated to a one- I suggest. 8 shows a first resource region 810 of one subframe (for example, subframe # 1). As shown in FIG. 8, each remote node is transmitted through the same resource through a code division scheme. In addition, since only one remote node is allocated to one resource in the conventional 3GPP LTE, it is assumed that the number of remote nodes to transmit on the PUSCH in the first resource region 810 to be overlapped is 1. In FIG. 8, terminals 2 and 3 perform one shot transmission. Signatures / data between the terminal 2 and the terminal 3 can be distinguished from each other and read out when the terminal 2 and the terminal 3 transmit the code with the orthogonality by the code division method. In addition, the PUSCH transmission of the terminal 1 is also transmitted by the dedicated channel transmission method and the data can be encoded to have orthogonality with the one-shot transmission of the terminal 2/3. As a result, one-shot transmission and PUSCH transmission are performed in the first resource region 810, which is a subframe set for one-shot transmission, so that efficient use of resources can be increased. In a one-shot transmission at a remote node, unlike a dedicated channel, a pilot may not be periodically transmitted, so that power control affects reception performance. In particular, when the remote node is relatively high, the reception performance is deteriorated due to a large error in the power control. Therefore, a certain level of performance margin can be set, and the transmission power can be set to be somewhat higher, thereby ensuring the reception performance.

Hereinafter, a specific operation of the host node and the remote node in the case of one-shot transmission in the first resource region will be described. The host node and the remote node implement the one-shot transmission method. In more detail, the remote node receives the resource information allocated to the one-shot transmission transmitted from the host node in the remote node. The remote node arbitrarily selects the resource allocated from the remote node, Demodulating a signature among the frames received at the host node; demodulating or retransmitting data according to signature demodulation success; and retransmitting according to whether data demodulation is successful.

In addition, the step of receiving the resource information allocated to the one shot transmission, that is, the information of the first resource area in the one shot transmission process, may be performed only when the host node allocates a specific resource for one shot transmission, Resource information can be transmitted.

9 is a flowchart illustrating an operation of a host node according to an embodiment of the present invention. This flowchart starts from the point when one-shot transmission occurs at the remote node.

When the one-shot transmission occurs in the first resource area, the host node attempts to demodulate the signature preferentially in the one-shot transmission signal received in the first resource area (S910). The first resource region to be demodulated is a specific radio resource region of a subframe allocated for one-shot transmission in a frame, and in one embodiment means a specific resource region in FIG. 3 to FIG. May exist for each frame according to a predetermined ratio with the area where the RACH is transmitted. When the time division scheme of FIG. 6 is applied, the host node may attempt to demodulate a signature among symbols of a specific subframe set as one-shot transmission. Thereafter, the host node confirms whether the signature is successfully demodulated (S920). If the demodulation of the signature is successful, the process proceeds to step S930. If the demodulation fails, the process proceeds to step S960.

If the signature demodulation is successful (S920), the host node attempts to demodulate the data (S930). In step S930, if the signature demodulation is successful and the data demodulation is attempted in step S920, a frame in which the first resource area is allocated for one-shot transmission (hereinafter referred to as "one-shot frame" Lt; / RTI > On the other hand, when data demodulation is attempted in S980 (to transmit data on a dedicated channel), which will be described later, data of a frame allocated for dedicated channel transmission is attempted to be demodulated. In this step, the data can be demodulated using the channel-estimated value through the demodulated signature in the previous step.

In step S930, the host node that has performed the data demodulation checks whether the demodulation of the data is successful or not (S940). If it is determined that the demodulation is successful, the process proceeds to step S950. If the demodulation fails, the process proceeds to step S970.

In step S950, the host node transmits an ACK to the remote node since data demodulation is successful. When the ACK transmission is completed, the data transmission through the one-shot transmission of the remote node is completed.

In step S960, it is determined that the demodulation of the signature in the one-shot frame fails in step S920. If the demodulation of the signature fails, the host node can not know the remote node that transmitted the one-shot frame, so the host node proceeds to the retransmission reception standby state. On the other hand, if the remote node does not receive an ACK after one shot transmission, the remote node can perform one-shot transmission for retransmission or transmission through dedicated channel setting. When the remote node performs one-shot transmission, it can be limited to the preset number of one-shot retransmission. Therefore, the host node proceeds through steps S960 to S963 and maintains a preamble reception standby state for standby for one-shot retransmission and / or dedicated channel setting.

If one-shot frames retransmitted in steps S960 and S961 are received, the process proceeds to step S910 and a series of processes for demodulating from the signature proceeds. On the other hand, if no one-shot retransmission is performed in S961, a preamble for dedicated channel setting is received (S963), and the flow advances to step S970. When the remote node transmits a preamble in the RACH region, the host node can receive the preamble. Therefore, when the preamble is received in step S963, the procedure goes to steps S970 and S980 for data reception on the dedicated channel. The step S970 may be performed in S940 or S963. First, a case of proceeding in S940 will be described. If the host node succeeds in demodulating the signature of the one-shot frame (S920) and fails to demodulate the data (940), the remote node that transmitted the one-shot frame through the demodulated signature in S910 can be confirmed at the host node.

On the other hand, when the preamble is received in step S963, the host node can know which remote node has transmitted through the received preamble. Accordingly, the host node transmits an SG (Scheduling Grant, hereinafter referred to as "SG") signal for setting a dedicated channel to the corresponding remote node using the signature of S910 or the preamble of S962 (S970). In step S980, the remote node receives the frame transmitted through the dedicated channel set in step S970 from the remote node receiving the SG. Since the connection is the dedicated channel, the process proceeds to step S930 in which the data of the received frame is demodulated.

10 is a flowchart illustrating an operation of a remote node in a one-shot transmission according to an embodiment of the present invention. This flowchart starts from the point when one-shot transmission occurs at the remote node.

After one-shot transmission, the remote node initializes the one-shot transmission number N to zero (S1010). Thereafter, an ACK for a one-shot transmission is received from the host node (S1020), and it is confirmed whether an ACK is received (S1030). When ACK reception is successful, data transmission is completed. However, if the ACK is not received in S1030, the maximum reception standby time the listening process of SG or ACK to (T 0) and proceeds to (S1020 ->S1020> S1030 - > S1040 -> S1050 - -> S1070). Let's look at each step in more detail.

As shown in FIG. 9, if the host node succeeds in signature demodulation (S920) and fails to demodulate data (S940), the host node proceeds to S970 where the SG signal is transmitted. In response to this, the remote node proceeds to step S1030 and attempts to receive the SG (S1040). On the other hand, even if the remote node transmits a preamble for the dedicated channel setting in step S1081, the remote node tries reception of the SG (step S1040).

The reception result of the SG (S1040) It is confirmed whether or not the SG is received (S1050). If the SG is received, the process proceeds to step S1060. Otherwise, the process proceeds to step S1070.

When the SG is received, the remote node retransmits the data through the resources allocated through the SG (S1060). Thereafter, the process proceeds to step S1020, and a series of processes are performed.

If SG is not received, the remote node compares the maximum reception waiting time (T 0 ) with the current time (S 1070). If the reception waiting time up to the present time is shorter than T 0 , that is, if the maximum reception time is not exceeded (S 1080), the process proceeds to step S 1020 and proceeds to the reception waiting process of the SG or ACK. On the other hand, if the reception waiting time up to the present is longer than T 0 , that is, if the maximum reception time is exceeded (S 1080), it is determined that the signature demodulation of the transmitted one-shot frame is unsuccessful and the process proceeds to step S 1080.

The remote node judges whether to retransmit the data according to the maximum number of one-shot transmission through the one-shot transmission method or to retransmit the data to the dedicated channel. If the number of times of one-shot transfer N is less than the one-shot transfer the maximum number of times (N 0) of the data, will be described again, N is that if it is not to exceed the maximum one-shot number of retransmissions (N 0) (S1080), increasing the N 1 The process proceeds to step S1082 and step S1083 in which one-shot retransmission is performed, and retransmission is performed through the one-shot transmission method. N is the maximum number of one-shot transmission (N 0 ) If N is greater than the maximum one-shot retransmission count N 0 (S 1080), the flow advances to step S 1080 to set a dedicated channel and perform a retransmission (step S 1018). Here, the N 0 value can be set according to the degree of delay in retransmission and the degree of delay due to the dedicated channel setting. For example, if the time required for setting the dedicated channel is longer than the time for retransmission after one-shot transmission's signature demodulation failure, it can be set to retransmit up to once by one-shot transmission.

The remote node transmits a preamble for setting a dedicated channel for retransmission (S1081). This process is the same as the random access procedure of 3GPP LTE. After the transmission of the preamble, a series of processes proceeds through step S1040.

The present invention proposes a one-shot transmission, which is a transmission without allocation of a dedicated channel in the first resource area. A resource to which data is transmitted and received through a dedicated channel allocation process is referred to as a second resource region and is distinguished from a first resource region.

As described above, the first resource region is a resource region allocated for one-shot transmission, and the second resource region is a resource region allocated for PUSCH (Physical Uplink Shared CHannel) transmission. In addition, the PUSCH can be transmitted in the first resource region according to an embodiment, as described above with reference to FIG. Also, in the one-shot transmission, the signatures and the data are transmitted in the first resource area in a time division scheme or a code division scheme in advance, as described above with reference to FIG. 6 and FIG. The first resource region and the RACH region may be set differently in the same resource region according to the frame. 4 and 5, respectively.

When the one-shot transmission between the remote node and the host node proceeds without fail, steps S910, S920, S930, S940, and S950 in FIG. 9 are performed on the host node side, and steps S1010 and S1020 in FIG. Lt; / RTI > However, due to a collision in a signal transmitted from a plurality of remote nodes in a one-shot transmission, a one-shot transmission transmitted by a remote node may not be recognized by the host node or may not be able to confirm data. In this case, the operation process between the host node and the remote node is examined.

11 and 12 illustrate transmission and reception processes between a remote node and a host node according to an embodiment of the present invention.

11 is a diagram illustrating a process in which signature demodulation fails according to an embodiment of the present invention. The host node 102 controls radio resources including a first resource region and a second resource region. The host node 102 transmits the resource information of the first resource region to the remote node 101 (S1110). The remote node 101 transmits the signature and data generated using the received resource information to the host node 102 in the first resource region (S1115). The host node 102 tries to demodulate the signature in the signal received in the first resource region and fails (S1120). If the signature demodulation fails, the remote node can not be confirmed, so it waits for retransmission. On the other hand, the remote node 101 confirms that the ACK is not received within a predetermined time (S1130, S1150, S1170), and transmits the signature and data in the first resource area until the maximum number of retransmissions (S1135, S1155). However, the host node 102 may still fail to demodulate the signature (S1140, S1160). Thereafter, if it is confirmed that the number of retransmissions is exceeded (S1175), the remote node 101 proceeds to transmit through the dedicated channel of the second resource area without further proceeding with one-shot transmission. Accordingly, the remote node 101 transmits the preamble (S1180). When the host node 102 receiving the transmission transmits the scheduling grant (S1185), the remote node 101 transmits the data in the second resource region ( S1190).

FIG. 12 is a diagram illustrating a process when data demodulation fails according to another embodiment of the present invention. S1110 to S1120 take the place of the description of Fig.

If the host node 102 succeeds in signature demodulation (S1120) and fails to demodulate the data (S1210), the remote node 101 can be confirmed, so that the scheduling grant is transmitted (S1215). The remote node 101 transmits data in the second resource area allocated in the scheduling grant (S1220).

A one-shot transmission process according to an exemplary embodiment of the present invention includes receiving resource information allocated to a one-shot transmission transmitted from a host node in a remote node, and transmitting a frame composed of a signature and data, Demodulating a signature of a frame received at a host node; Demodulating or retransmitting data according to signature demodulation success or not, and retransmitting according to whether data demodulation is successful. 9-12.

In the one-shot transmission process according to the embodiment, the step of receiving the resource information allocated to the one-shot transmission may transmit the resource information only when there is a change after allocating a specific resource for one shot transmission in advance in the host node .

13 is a diagram illustrating a process in which a host node and a remote node share information of a first resource region according to an embodiment of the present invention. The host node 102 transmits the resource information of the first resource region (S1310). The resource information may be information indicating in which frame the first resource area is set. For example, in FIG. 4, an even-numbered frame is set as a first resource region, not a RACH region. Also, in FIG. 5, it has been described that the 3, 6, ... frame is set as the first resource region instead of the RACH region. Accordingly, the host node can transmit resource information on which frame the first resource area is allocated. When the resource information of the first resource region is shared between the remote node 101 and the host node 102, the remote node 101 can continuously perform one-shot transmission in the first resource region (S1321 to S1329 ). On the other hand, the host node 102 can change the first resource region according to the increase or decrease of the efficiency of radio resources or the number of remote nodes. Thus, the resource information for the changed first resource area is transmitted to the remote node 101 (S1340). The remote node 101 can continuously perform one-shot transmission in the new first resource region by applying the resource information for the changed first resource region (S1351 to S1359).

Also, the demodulation and retransmission process according to the embodiment retransmits by one-shot transmission to the retransmission or dedicated connection depending on whether the signature and data are successfully demodulated. At this time, the maximum number of retransmissions through one-shot transmission can be variably set. When the maximum number of retransmissions through one-shot transmission is exceeded, it can be retransmitted through a dedicated connection. The re-transmission procedure through the dedicated connection includes a step in which the remote node transmits a preamble to a random access channel for setting a dedicated channel, a step in which the host node establishes a dedicated channel to the remote node, and a step in which the remote node transmits data to the dedicated channel .

FIG. 14 is a diagram illustrating a configuration of a host node according to another embodiment.

14, a host node 1400 according to another embodiment includes a control unit 1410, a transmission unit 1420, and a reception unit 1430. One embodiment of the host node is a base station.

The control unit 1410 controls the overall operation of the base station according to the method for directly transmitting data with a low delay in the case of the UE maintaining the time synchronization, which is necessary for performing the above-described present invention.

The transmitting unit 1420 and the receiving unit 1430 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

In more detail, the controller 1410 generates resource information of the first resource area. The receiver 1430 receives the signature and data in the first resource area. The control unit 1410 may control the receiving unit 1430 to receive data in the first resource area or the second resource area. Here, the first resource region is a resource region allocated for one-shot transmission and the second resource region is a resource region allocated for PUSCH (Physical Uplink Shared CHannel) transmission. If the control unit 1410 fails to demodulate the data, that is, if the demodulation of the signature transmitted from the first resource region is successful but the demodulation of the data fails, the transmitting unit 1420 transmits the scheduling grant to the remote node . Then, the receiver 1430 receives data from the remote node through the dedicated channel of the second resource area allocated in the grant.

On the other hand, when the control unit 1410 fails to perform the signature demodulation, the remote node transmits the preamble, and the receiving unit 1430 receives the preamble. The transmitting unit 1420 transmits the scheduling grant to the remote node identified as a preamble,

Also, the controller 1410 can change the first resource region, and the transmitter 1420 transmits the resource information of the changed first resource region to the remote node. Then, the receiver 1430 receives data from the remote node through the dedicated channel of the second resource area allocated in the scheduling grant.

15 is a diagram illustrating a configuration of a remote node according to another embodiment of the present invention.

15, a user terminal 1500 according to another embodiment includes a receiving unit 1530, a control unit 1510, and a transmitting unit 1520. One embodiment of a remote node is a user terminal.

The receiver 1530 receives downlink control information, data, and messages from the base station through the corresponding channel.

In addition, the controller 1510 controls the overall operation of the terminal according to performing a method of directly transmitting data with a low delay in the case of a terminal in which some time synchronization is required to perform the present invention.

The transmitter 1520 transmits uplink control information, data, and a message to the base station through the corresponding channel.

In more detail, the receiving unit 1530 receives the resource information of the first resource region from the host node. The control unit 1510 generates signatures and data using resource information. The transmitting unit 1520 transmits the signature and data to the host node in the first resource region. The control unit 1510 controls the transmitting unit 1520 to transmit data in the first resource region or the second resource region. Here, the first resource region is a resource region allocated for one-shot transmission and the second resource region is a resource region allocated for PUSCH (Physical Uplink Shared CHannel) transmission.

The receiver 1530 can receive the changed resource information for the first resource area. Also, when the receiving unit 1530 fails to receive the response information for the transmission within the preset time, the transmitting unit 1520 retransmits the signature and the data. Also, when the receiving unit 1530 receives the scheduling grant instead of the ACK, the transmitting unit 1520 transmits data to the host node through the dedicated channel of the second resource area allocated in the scheduling grant. If the number of retransmissions exceeds the preset maximum number of retransmissions, the transmitter 1520 transmits a preamble, the receiver 1530 receives the scheduling grant, and then the transmitter 1520 transmits a second resource zone Lt; RTI ID = 0.0 > a < / RTI > dedicated channel.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (15)

  1. A method for a remote node to transmit data to a host node controlling a radio resource including a first resource region and a second resource region,
    The remote node receiving resource information of the first resource region from a host node; And
    And transmitting the signature and data using the resource information from the remote node to the host node in the first resource area,
    The first resource region is a dedicated resource region allocated for one-shot transmission, and the second resource region is a PUSCH (Physical Uplink Shared CHannel) transmission resource region allocated in the scheduling grant through a random access procedure. Lt; / RTI >
  2. delete
  3. delete
  4. The method according to claim 1,
    Wherein the transmitting is a step in which the remote node transmits the signature and the data in the first resource area in a time division manner or a code division manner.
  5. The method according to claim 1,
    Wherein the remote node further comprises receiving modified resource information for the first resource region from a host node.
  6. The method according to claim 1,
    Further comprising retransmitting the signature and the data if the remote node fails to receive response information for the transmission within a predetermined time.
  7. The method according to claim 1,
    Wherein the remote node further comprises receiving the scheduling grant.
  8. 8. The method of claim 7,
    Wherein the remote node further comprises transmitting data to the host node over a dedicated channel of the second resource area allocated in the scheduling grant.
  9. The method according to claim 6,
    When the number of retransmissions exceeds the preset maximum retransmission number,
    Transmitting a preamble;
    Receiving the scheduling grant; And
    And transmitting data to the host node through a dedicated channel of the second resource area allocated in the scheduling grant.
  10. A method for receiving data from a remote node, the host node controlling a radio resource including a first resource region and a second resource region,
    The host node transmitting resource information of the first resource region to the remote node; And
    The host node receiving signature and data from the remote node in the first resource region,
    Wherein the signature and data are generated using the resource information,
    The first resource region is a dedicated resource region allocated for one-shot transmission, and the second resource region is a PUSCH (Physical Uplink Shared CHannel) transmission resource region allocated in the scheduling grant through a random access procedure. ≪ / RTI >
  11. delete
  12. delete
  13. 11. The method of claim 10,
    The host node changing the transmitted first resource region; And
    And transmitting resource information for the changed first resource region to a remote node.
  14. 11. The method of claim 10,
    If the demodulation of the signature transmitted in the first resource area is successful but the demodulation of the data fails,
    Wherein the host node further comprises transmitting the scheduling grant to the remote node.
  15. A receiving unit for receiving resource information of a first resource region from a host node;
    A control unit for generating a signature and data using the resource information; And
    And a transmitter for transmitting the signature and data to the host node in the first resource region,
    Wherein the controller controls the transmitter to transmit data in the first resource region or the second resource region, the first resource region is a dedicated resource region allocated for one-shot transmission, And the second resource region is a resource region allocated for transmission of Physical Uplink Shared CHannel (PUSCH) in a scheduling grant through a random access procedure.
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KR100930898B1 (en) * 2006-02-07 2009-12-10 엘지전자 주식회사 Response information transmission method in a mobile communication system
JP2013005148A (en) 2011-06-15 2013-01-07 Ntt Docomo Inc Radio communication system, base station, mobile station and radio communication method
KR101224538B1 (en) * 2008-09-17 2013-01-22 삼성전자주식회사 Apparatus and method for processing interrupt of upper message is happened by adaptive retransmission command during random access procedure in mobile communication system

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Publication number Priority date Publication date Assignee Title
KR20120071229A (en) * 2010-12-22 2012-07-02 한국전자통신연구원 Method for transmitting data for mobile communication systems

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Publication number Priority date Publication date Assignee Title
KR100930898B1 (en) * 2006-02-07 2009-12-10 엘지전자 주식회사 Response information transmission method in a mobile communication system
KR101224538B1 (en) * 2008-09-17 2013-01-22 삼성전자주식회사 Apparatus and method for processing interrupt of upper message is happened by adaptive retransmission command during random access procedure in mobile communication system
JP2013005148A (en) 2011-06-15 2013-01-07 Ntt Docomo Inc Radio communication system, base station, mobile station and radio communication method

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