KR20190021997A - Apparatus and method for tranasmitting packets in wireless communication system - Google Patents

Abstract

The present disclosure relates to a 5^th generation (5G) or pre-5G communication system to support a higher data transmission rate than that of 4^th generation (4G) communication system such as a long term evolution (LTE). The present disclosure is to transmit packets in a wireless communication system. An operation method of a terminal comprises the steps of: receiving information on a first resource and information on a second resource shared with at least one other terminal; transmitting a packet through the first resource; and transmitting the packet through the second resource based on a control parameter determined based on the information on the first resource.

Description

[0001] APPARATUS AND METHOD FOR TRANSMITTING PACKETS IN WIRELESS COMMUNICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION [0002] This disclosure relates generally to wireless communication systems, and more specifically to an apparatus and method for transmitting packets in a wireless communication system.

Efforts are underway to develop improved 5G (5 ^th generation) communication systems or pre-5G communication systems to meet the increasing demand for wireless data traffic after commercialization of 4G (4 ^th generation) communication systems. For this reason, a 5G communication system or a pre-5G communication system is referred to as a 4G network (Beyond 4G Network) communication system or a LTE (Long Term Evolution) system (Post LTE) system.

In order to achieve a high data transmission rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (such as 60 gigahertz (60GHz) bands). In the 5G communication system, beamforming, massive MIMO, full-dimensional MIMO, and FD-MIMO are used in order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave. ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, in order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed.

In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), and the Advanced Connection Technology (FBMC) ), Non-Orthogonal Multiple Access (NOMA), and Sparse Code Multiple Access (SCMA).

The 5G system currently being discussed in 3GPP (Third Generation Partnership Project) is also called NR (new radio) system. Various technologies for supporting enhanced mobile broadband (eMBB), ultra reliable and low latency communication (URLLC) and enhanced machine type communication (eMTC) are being discussed in 3GPP. Furthermore, various techniques for improving the reliability of communication are being discussed.

Based on the above discussion, the disclosure provides an apparatus and method for increasing the reliability of communications in a wireless communication system.

The present disclosure also provides an apparatus and method for increasing reliability through a packet duplication technique in a wireless communication system.

The present disclosure also provides an apparatus and method for increasing the resource efficiency of a packet replication technique in a wireless communication system.

The present disclosure also provides an apparatus and method for performing a packet replication technique using a shared resource in a wireless communication system.

The present disclosure also provides an apparatus and method for selecting a terminal to which a packet replication scheme is applied in a wireless communication system.

According to various embodiments of the present disclosure, a method of operating a terminal in a wireless communication system includes receiving information about a first resource and information about a second resource shared with at least one other terminal, Transmitting the packet through the second resource based on the control parameter determined based on the information related to the first resource.

According to various embodiments of the present disclosure, a method of operating a base station in a wireless communication system includes: transmitting information about a resource shared with a second terminal to a first terminal; The method comprising the steps of: transmitting information about resources to be transmitted to the first terminal, and receiving the first terminal or the second terminal rotor packet through the resource, The first control parameter determined based on the information related to the resource, and the second control parameter determined based on the information related to the second dedicated resource allocated to the second terminal.

According to various embodiments of the present disclosure, in a wireless communication system, a terminal apparatus includes a transceiver unit and at least one processor connected to the transceiver unit, and the transceiver unit transmits information about the first resource and at least one other terminal And transmitting the packet via the second resource based on the control parameter determined based on the information related to the first resource, and transmitting the packet via the second resource do.

According to various embodiments of the present disclosure, in a wireless communication system, a base station apparatus includes a transceiver and at least one processor connected to the transceiver, and the transceiver transmits the resource shared with the second terminal to the first terminal Transmits information about resources shared with the first terminal to the second terminal and receives the first terminal or the second terminal rotor packet through the resource, and the transmitter of the packet transmits , A first control parameter determined based on information related to a first dedicated resource allocated to the first terminal, and a second control parameter determined based on information related to a second dedicated resource allocated to the second terminal.

The apparatus and method according to various embodiments of the present disclosure may improve resource efficiency in performing packet replication by performing a packet duplication operation using a shared resource.

The effects obtainable from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below will be.

1 illustrates a wireless communication system in accordance with various embodiments of the present disclosure.
2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
4 illustrates a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure.
5A illustrates an application of a packet duplication technique in a wireless communication system according to various embodiments of the present disclosure.
Figure 5B illustrates a protocol stack of dual connectivity (DC) in a wireless communication system according to various embodiments of the present disclosure.
6 illustrates signaling for data delivery based on packet replication in a wireless communication system in accordance with various embodiments of the present disclosure.
Figures 7A and 7B illustrate examples of resource usage in performing packet replication in a wireless communication system in accordance with various embodiments of the present disclosure.
8 shows a flowchart of a base station allocating dedicated resources in a wireless communication system in accordance with various embodiments of the present disclosure.
9 shows a flowchart of a base station allocating shared resources in a wireless communication system according to various embodiments of the present disclosure.
10 shows a flow diagram of a terminal performing packet replication in a wireless communication system in accordance with various embodiments of the present disclosure.
11 illustrates an example of resource usage in performing packet replication using shared resources in a wireless communication system in accordance with various embodiments of the present disclosure.
12 illustrates signal exchange for packet replication using shared resources in a wireless communication system in accordance with various embodiments of the present disclosure.
13 illustrates an example of a change in channel gain in a wireless communication system in accordance with various embodiments of the present disclosure.
14 shows a flowchart of a base station for managing parameters related to occupancy of shared resources in a wireless communication system in accordance with various embodiments of the present disclosure;
15 shows a flow diagram of a terminal for determining parameters related to occupancy of a shared resource in a wireless communication system according to various embodiments of the present disclosure;
16 illustrates signaling in the case where a control parameter for occupancy of a shared resource in a wireless communication system according to various embodiments of the present disclosure is determined by a terminal.
Figure 17 illustrates signaling in the case where control parameters for the occupation of shared resources in a wireless communication system in accordance with various embodiments of the present disclosure are determined by a base station.
18 shows a flowchart of a base station selectively performing packet replication operations in a wireless communication system according to various embodiments of the present disclosure.

The terms used in this disclosure are used only to describe certain embodiments and may not be intended to limit the scope of other embodiments. The singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art. The general predefined terms used in this disclosure may be interpreted as having the same or similar meaning as the contextual meanings of the related art and, unless explicitly defined in the present disclosure, include ideally or in an excessively formal sense . In some cases, the terms defined in this disclosure can not be construed to exclude embodiments of the present disclosure.

In the various embodiments of the present disclosure described below, a hardware approach is illustrated by way of example. However, the various embodiments of the present disclosure do not exclude a software-based approach, since various embodiments of the present disclosure include techniques that use both hardware and software.

The present disclosure relates to an apparatus and method for transmitting packets in a wireless communication system. Specifically, this disclosure describes a technique for transmitting packets using a packet duplication technique in a wireless communication system.

A term referring to a control layer, a term referring to a protocol layer, a term (e.g., packet) referring to a unit of data (e.g., a packet), a network entity, The terms referring to components of the apparatus, and the like are illustrated for convenience of explanation. Accordingly, the present disclosure is not limited to the following terms, and other terms having equivalent technical meanings can be used.

Further, the present disclosure describes various embodiments using terms used in some communication standards (e.g., 3rd Generation Partnership Project (3GPP)), but this is merely illustrative. The various embodiments of the present disclosure can be easily modified and applied in other communication systems as well.

1 illustrates a wireless communication system in accordance with various embodiments of the present disclosure. 1 illustrates a base station 110, a terminal 120, and a terminal 130 as a part of nodes using a wireless channel in a wireless communication system. Although FIG. 1 shows only one base station, it may further include another base station which is the same as or similar to the base station 110.

The base station 110 is a network infrastructure that provides wireless access to the terminals 120, The base station 110 has a coverage defined by a certain geographic area based on the distance over which the signal can be transmitted. The base station 110 includes an 'access point (AP)', 'eNodeB (eNodeB)', '5G node', 'wireless point', ' A transmission / reception point (TRP) ', or other terms having equivalent technical meanings.

Each of the terminal 120 and the terminal 130 is a device used by a user and communicates with the base station 110 through a wireless channel. In some cases, at least one of terminal 120 and terminal 130 may be operated without user involvement. That is, at least one of the terminal 120 and the terminal 130 is an apparatus for performing machine type communication (MTC), and may not be carried by a user. Each of the terminal 120 and the terminal 130 may include a terminal, a user equipment (UE), a mobile station, a subscriber station, a remote terminal, Wireless terminal, '' user device, 'or any other terminology having equivalent technical meanings.

The base station 110, the terminal 120, and the terminal 130 can transmit and receive wireless signals in the millimeter wave band (e.g., 28 GHz, 30 GHz, 38 GHz, and 60 GHz). At this time, in order to improve the channel gain, the base station 110, the terminal 120, and the terminal 130 may perform beamforming. Here, beamforming may include transmit beamforming and receive beamforming. That is, the base station 110, the terminal 120, and the terminal 130 may assign a directivity to a transmission signal or a reception signal. To this end, the base station 110 and the terminals 120, 130 may select the serving beams 112, 113, 121, 131 through a beam search or beam management procedure. After the serving beams 112, 113, 121, and 131 are selected, communication may then be performed through resources that are in quasi co-located (QCL) relationship with the resources that transmitted the serving beams 112, 113, 121,

2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 2 can be understood as a configuration of the base station 110. FIG. Used below '... Wealth, '... Quot; and the like denote a unit for processing at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

Referring to FIG. 2, the base station includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230, and a control unit 240.

The wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs conversion between a baseband signal and a bit string according to a physical layer specification of the system. For example, at the time of data transmission, the wireless communication unit 210 generates complex symbols by encoding and modulating a transmission bit stream. Also, upon receiving the data, the wireless communication unit 210 demodulates and decodes the baseband signal to recover the received bit stream. Also, the wireless communication unit 210 up-converts the baseband signal to an RF (radio frequency) band signal, transmits the signal through the antenna, and downconverts the RF band signal received through the antenna to a baseband signal.

To this end, the wireless communication unit 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), and an analog to digital converter (ADC). In addition, the wireless communication unit 210 may include a plurality of transmission / reception paths. Further, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit may include a plurality of subunits according to operating power, an operating frequency, .

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or a part of the wireless communication unit 210 may be referred to as a 'transmitting unit', a 'receiving unit', or a 'transceiver'. In the following description, the transmission and reception performed through the wireless channel are used to mean that the processing as described above is performed by the wireless communication unit 210. [

The backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts a bit string transmitted from the base station to another node, for example, another access node, another base station, an upper node, a core network, etc., into a physical signal, .

The storage unit 230 stores data such as a basic program, an application program, and setting information for operation of the base station. The storage unit 230 may be composed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 230 provides the stored data at the request of the control unit 240.

The control unit 240 controls the overall operations of the base station. For example, the control unit 240 transmits and receives signals through the wireless communication unit 210 or through the backhaul communication unit 220. [ In addition, the control unit 240 records and reads data in the storage unit 230. [ The control unit 240 can perform functions of a protocol stack required by the communication standard. To this end, the control unit 240 may include at least one processor. According to various embodiments, the control unit 240 includes a resource allocation unit 242 for allocating resources to terminals (e.g., terminal 120, terminal 130) and an LBT (listen before talk) unit for performing control related to occupation of a competitive channel in a shared resource 244 < / RTI > Here, the resource allocating unit 242 and the LBT constructing unit 244 may be a storage or an instruction set or code stored in the storage unit 230, at least temporarily storing a command / code or instruction / code residing in the control unit 240, And may be part of the circuitry constituting the control unit 240. [

According to various embodiments, the control unit 240 may transmit information about resources shared by a plurality of terminals to each terminal, and control to receive any one of a plurality of terminals through a shared resource. Here, the sender of the packet may depend on the control parameters determined based on information related to the dedicated resources of each of the plurality of terminals. For example, the control unit 240 may control the base station to perform operations according to various embodiments described below.

3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 3 can be understood as a configuration of the terminal 120. FIG. Used below '... Wealth, '... Quot; and the like denote a unit for processing at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

Referring to FIG. 3, the terminal includes a communication unit 310, a storage unit 320, and a control unit 330.

The communication unit 310 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 310 performs conversion between a baseband signal and a bit string according to a physical layer specification of the system. For example, at the time of data transmission, the communication unit 310 generates complex symbols by encoding and modulating a transmission bit stream. Also, upon receiving the data, the communication unit 310 demodulates and decodes the baseband signal to recover the received bit stream. In addition, the communication unit 310 up-converts the baseband signal to an RF band signal, transmits the RF band signal through the antenna, and down converts the RF band signal received through the antenna to a baseband signal. For example, the communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

In addition, the communication unit 310 may include a plurality of transmission / reception paths. Further, the communication unit 310 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the communication unit 310 may be composed of digital circuitry and analog circuitry (e.g., RFIC (radio frequency integrated circuit)). Here, the digital circuit and the analog circuit can be implemented in one package. In addition, the communication unit 310 may include a plurality of RF chains. Further, the communication unit 310 can perform beamforming.

The communication unit 310 transmits and receives signals as described above. Accordingly, all or a part of the communication unit 310 may be referred to as a 'transmission unit', a 'reception unit', or a 'transmission / reception unit'. In the following description, the transmission and reception performed through the wireless channel are used to mean that the processing as described above is performed by the communication unit 310. [

The storage unit 320 stores data such as a basic program, an application program, and setting information for operation of the terminal. The storage unit 320 may be composed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 320 provides the stored data at the request of the control unit 330.

The controller 330 controls overall operations of the terminal. For example, the control unit 330 transmits and receives signals through the communication unit 310. In addition, the controller 330 writes data to the storage unit 320 and reads the data. The control unit 330 can perform the functions of the protocol stack required by the communication standard. To this end, the control unit 330 may include at least one processor or a microprocessor, or may be part of a processor. Also, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP). According to various embodiments, the controller 330 may include an LBT constructor 332 that performs control related to competitive channel occupancy in the shared resource. Here, the LBT constituent unit 332 is a set or code of instructions stored in the storage unit 330, which is a storage space storing at least a command / code or instruction / code residing in the control unit 330 at a minimum, May be part of the circuitry.

According to various embodiments, the controller 330 receives information about a first resource and information about a second resource that is shared with at least one other terminal, transmits a packet through the first resource, Based on the control parameter determined based on the control parameter. For example, the control unit 330 may control the terminal to perform operations according to various embodiments described below.

4 illustrates a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure. FIG. 4 shows an example of a detailed configuration of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. Specifically, FIG. 4 illustrates components for performing beamforming as part of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG.

4, the wireless communication unit 210 or the communication unit 310 includes a coding and modulation unit 402, a digital beamforming unit 404, a plurality of transmission paths 406-1 through 406-N, and an analog beamforming unit 408. [

The encoding and modulation unit 402 performs channel encoding. For channel encoding, at least one of a low density parity check (LDPC) code, a convolution code, and a polar code may be used. The encoding and modulation unit 402 generates modulation symbols by performing contellation mapping.

Digital beamforming section 404 performs beamforming on digital signals (e.g., modulation symbols). To this end, digital beamforming section 404 multiplies the modulation symbols with the beamforming weights. Here, the beamforming weights are used to change the size and phase of the signal, and may be referred to as a 'precoding matrix', a 'precoder', or the like. Digital beamforming section 404 outputs the digital beamformed modulation symbols to multiple transmission paths 406-1 through 406-N. At this time, according to a multiple input multiple output (MIMO) transmission scheme, the modulation symbols may be multiplexed or the same modulation symbols may be provided to a plurality of transmission paths 406-1 through 406-N.

The plurality of transmission paths 406-1 through 406-N convert the digital beamformed digital signals into analog signals. To this end, each of the plurality of transmission paths 406-1 through 406-N may include an inverse fast fourier transform (IFFT) operation unit, a cyclic prefix (CP) insertion unit, a DAC, and an up conversion unit. The CP inserter is for an orthogonal frequency division multiplexing (OFDM) scheme, and can be excluded when another physical layer scheme (e.g., FBMC (filter bank multi-carrier)) is applied. That is, the plurality of transmission paths 406-1 through 406-N provide an independent signal processing process for a plurality of streams generated through digital beamforming. However, depending on the implementation, some of the components of the multiple transmission paths 406-1 through 406-N may be used in common.

The analog beamforming unit 408 performs beamforming on the analog signal. To this end, the digital beamforming section 404 multiplies the analog signals with the beamforming weights. Here, the beamforming weights are used to change the magnitude and phase of the signal.

As one of various techniques for enhancing the reliability of communication in the wireless communication system as described above, packet duplication techniques are being discussed. Packet replication is a technique for transmitting / receiving one identical packet through a plurality of different radio resources, and can be applied to both uplink and downlink. In addition, packet replication may be applied to both user plane data and control plane data. An example in which the packet replication technique is applied to the uplink is shown in FIG.

5A illustrates an application of a packet duplicate technique in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 5A, the terminal 120 has a connection with the base station 110-1 and the base station 110-2, respectively. For example, when a DC (dual connectivity) is formed, the base station 110-1 may be a master base station or a master g node B (MgNG), the base station 110-2 may be a secondary base station or a secondary gnb B). At the time of packet transmission, the UE transmits the same packet to each of the base station 110-1 and the base station 110-2 using the resource # 1 allocated from the base station 110-1 and the resource # 2 allocated from the base station 110-2. To this end, the transmitting terminal 120 replicates one packet generated in the packet data convergence protocol (PDCP) layer into two packets, that is, a packet to be transmitted to the base station 110-1 and a packet to be transmitted to the base station 110-2 . Accordingly, the base station 110-1 receives the packet from the terminal 120 through the resource # 1, and the base station 110-2 receives the packet from the terminal 120 through the resource # 2. Then, the base station 110-2 transmits the received packet to the base station 110-1, and the PDCP layer of the base station 110-1 removes the duplicated packet.

Removal of duplicated packets means the following operations. When only the base station 110-1 successfully receives the packet, the packet received by the base station 110-1 is transmitted to the upper layer irrespective of whether or not the packet reception by the base station 110-2 is successful. When only the base station 110-2 has successfully received the packet, the packet received at the base station 110-2 is transmitted to the upper layer irrespective of whether the base station 110-1 succeeds in receiving the packet. When both the base station 110-1 and the base station 110-2 successfully receive the packet, since the packet received at the base station 110-1 and the packet received at the base station 110-2 are the same packet, only one of the two packets is transmitted to the upper layer do.

The above-described packet replication function of the transmitting end and the duplicated packet removing function of the receiving end can improve the probability of successfully transmitting the packet, instead of doubling the resources of the base station and the terminal.

An example of the packet replication operation described with reference to FIG. 5A assumes a DC situation in which the terminal 120 is connected to both the base station 110-1 and the base station 110-2. 5B illustrates a protocol stack of DCs in a wireless communication system in accordance with various embodiments of the present disclosure. Referring to FIG. 5B, in the case of a DC having a PDCP split structure, the PDCP of the base station 110-1 is connected to the radio link control (RLC) of the base station 110-2. The packet replication operation will be described with reference to the protocol stack shown in FIG. 5B.

A packet generated in the PDCP layer 502 of the terminal 120 is duplicated as two packets, and one packet is processed through PHY (physical access) / MAC (media access control) / RLC 504-1 connected to the base station 110-1, One packet is processed through the PHY / MAC / RLC 504-2 connected to the base station 110-2. After that, the terminal 120 transmits the resource # 1 allocated by the base station 110-1 and the resource # 2 < / RTI > The base station 110-1 and the base station 110-2 that have received the packet process each packet, and the base station 110-2 transmits the packet processed by the base station 110-2 to the PDCP layer 512 of the base station 110-1. The PDCP layer 512 of the base station 110-1, which has received the packet from the base station 110-2, performs a duplicated packet removal operation, and if the at least one packet is successfully received, transfers the packet to the upper layer.

5A and 5B, a situation in which packet replication is applied to the uplink transmission / reception has been described. That is, the PDCP layer of the terminal 120 replicates a packet to be transmitted with two packets, and then transmits one packet to the base station 110-1 and the other packet to the base station 110-2. Accordingly, the base station 110-2 can forward the received packet to the PDCP layer of the base station 110-1, and the base station 110-1 can perform the duplicated packet removal. Similarly, packet replication can be applied to downlink communication as well. The difference is that the roles of the base station and the terminal are mutually changed. An example in which packet replication is performed in both the uplink and the downlink will be described with reference to FIG.

6 illustrates signaling for data delivery based on packet replication in a wireless communication system in accordance with various embodiments of the present disclosure.

Referring to FIG. 6, in downlink communication, in step 601, the base station 110-1 replicates a packet in the PDCP layer, and in step 603, a packet is transmitted to the base station 110-2. In step 605, the base station 110-1 transmits a packet to the terminal 120. [ In step 607, the base station 110-2 transmits the packet received from the base station 110-1 to the terminal 120. [ Thereafter, in step 609, the terminal 120 performs the duplicated packet removal in the PDCP layer.

In uplink communication, in step 611, the terminal 120 replicates a packet in the PDCP layer. In step 613, the terminal transmits the packet to the base station 110-1, and in step 615, the terminal transmits the packet to the base station 110-2. In step 617, the base station 110-2 transmits the received packet to the base station 110-1. Thereafter, the base station 110-1 performs the duplicated packet removal at the PDCP layer.

The packet replication operation described above assumes a DC structure having a PDCP separation mode. Similarly, the packet replication operation can be applied to a CA (carrier aggregation) structure composed of a primary cell (Pcell) and a secondary cell (Scell). Both the DC structure and the packet replication in the CA structure are performed in the PDCP layer. However, in the DC structure, packet replication is performed by transferring the duplicated packets to the RLC layer of different base stations (e.g., MgNB and SgNB) Are processed by different logical channels belonging to the < / RTI > Here, each logical channel is transmitted over a different carrier (e.g., PCell and SCell). Also, when cross schduling is applied, it may be different from DC structure that control signaling (e.g., transmission of resource allocation information) is performed by one cell (e.g., primary cell). The various embodiments described below assume a DC structure, but can be applied to the CA structure on the same principle.

The packet replication technique described above is similar to repeatedly transmitting the same packet, thus increasing the probability of successful transmission and reception of a packet. However, packet replication technology can increase resource usage. The resource usage due to the packet replication operation is shown in FIGS. 7A and 7B.

Figures 7A and 7B illustrate examples of resource usage in performing packet replication in a wireless communication system in accordance with various embodiments of the present disclosure. FIG. 7A illustrates a case where one terminal (e.g., terminal 120) performs packet replication, and FIG. 7B illustrates a case where two terminals (e.g., terminal 120 and terminal 130) perform packet replication.

7A illustrates resource allocation for packet replication when the terminal 120 is present. Referring to FIG. 7A, the base station 110-1 and the base station 110-2 allocate resources # 1 710 and resource # 2 720 to the terminal 120, respectively. FIG. 7B illustrates resource allocation for packet replication when the terminal 120 and the terminal 130 are present. Referring to FIG. 7B, the base station 110-1 and the base station 110-2 allocate resources # 1 710 and # 2 720 to the terminal 120, respectively, in order to replicate packets of the terminal 120. For packet replication of the terminal 130, the base station 110-1 and the base station 110-2 allocate the resource # 3 730 and the resource # 4 740 to the terminal 130, respectively.

As described with reference to Figures 7A and 7B, the packet replication operation may require as many resources as the number of packets to be replicated per UE (e.g., 2). Accordingly, there are various discussions for improving the resource efficiency of packet replication technology. For example, in order to improve resource efficiency, the following operations can be considered.

For example, the base station can promptly instruct the terminal whether to perform packet replication. In this case, it is possible to prevent a situation where a channel gain between one base station and the terminal is sufficiently good for successfully transmitting and receiving a packet, but a situation where an unnecessarily replicated packet is transmitted.

As another example, two packets replicated by the packet replication function may be transmitted simultaneously or sequentially according to the scheduling of the base station. If one base station successfully receives a packet and the terminal has not yet transmitted a packet to another base station, the base station may instruct the terminal not to transmit the packet. In this case, a situation in which the terminal unnecessarily transmits a duplicated packet to a plurality of base stations can be prevented.

In addition, the present disclosure suggests various embodiments for increasing resource efficiency in applying packet replication technology. The various embodiments described below can improve the efficiency of resource use while maintaining the advantages of packet replication, without relying solely on base station and inter-terminal signaling.

According to various embodiments, a base station allocates one dedicated resource and one shared resource instead of allocating two dedicated resources to a terminal performing packet replication. Here, a dedicated resource is a resource that is specifically allocated to one terminal, and a shared resource is a resource that is commonly allocated to a plurality of terminals. At this time, the shared resource may be a resource belonging to the licensed band or a resource belonging to the unlicensed band. In the embodiments described below, representations of dedicated resources and shared resources are used, but dedicated resources and shared resources may be referred to as other terms expressing equivalent technical meanings.

 When a terminal that performs packet replication transmits a replicated packet through a shared resource, the replicated packet is transmitted competitively with another terminal. That is, for a shared resource, the terminal checks whether another terminal has a channel, and then transmits a packet. To this end, the LBT technique may be used for shared resources. Various embodiments are described below by way of example of the LBT technique, but this will be understood as an example. Therefore, the present invention is not limited to the LBT technique, and other techniques for competitive occupation of the channel can be applied.

Using LBT, a clear channel is first observed for a given number of clear channel assessment (CCA) slots among a plurality of UEs to which a shared resource is allocated (hereinafter, referred to as " The terminal transmits a packet, and the remaining terminals do not transmit a packet. Therefore, it is desirable that the terminal that needs the packet replication most is controlled to be the first to succeed in the CCA. Thus, according to various embodiments, an LBT-related parameter may be set such that a terminal that needs the most packet replication may first succeed in the CCA.

8 shows a flowchart of a base station allocating dedicated resources in a wireless communication system in accordance with various embodiments of the present disclosure. 8 illustrates a method of operation of the base station 110-1.

Referring to FIG. 8, in step 801, the base station transmits information about the first resource and the second resource. Here, the first resource is a dedicated resource that is specifically allocated to a first terminal (e.g., the terminal 120), and the second resource includes a dedicated resource that is specifically allocated to a second terminal (e.g., the terminal 130). Here, both the first terminal and the second terminal attempt to perform uplink communication based on packet replication. For example, the first resource may be allocated so as to use channel information on the first terminal acquired in the past as statistical information on the channel. For example, the first resource may be allocated in a band or carrier corresponding to the first terminal.

In step 803, the base station receives data of the first terminal through the first resource. Since the first resource is a resource allocated only to the UE, a signal received through the first resource can be regarded as including data from the first UE. However, data reception by the first terminal may fail (e.g., decoding error, etc.) depending on a channel condition or the like.

In step 805, the base station receives data of the second terminal through the second resource. Since the second resource is a resource allocated only to the UE, a signal received through the second resource can be regarded as including data from the second UE. However, data reception by the second terminal may fail (e.g., decoding error, etc.) depending on the channel condition or the like.

In step 807, the base station receives data of either the first terminal or the second terminal from another base station. Here, the data received from another base station may include a packet (e.g., a PDCP packet or an RLC packet) identical to the data received in step 803 or step 805. That is, other base stations allocate a common resource that is competitively occupied by the first terminal and the second terminal, and the sender of the data received through the resource may vary according to the result of the competition.

Although not shown in FIG. 8, if data including the same packet as the data received in step 803 or 805 is received in step 807, the base station can remove the packet. That is, in step 807, the BS may perform a packet removal operation on the data of the first terminal or the data on the second terminal according to the sender of the data received.

Although not shown in FIG. 8, according to another embodiment, a base station may transmit information on a rule for determining control parameters for channel occupation in shared resources allocated by terminals to other base stations. For example, information about a rule may define a mapping relationship between information about a dedicated resource (e.g., channel quality) and a control parameter.

9 shows a flowchart of a base station allocating shared resources in a wireless communication system according to various embodiments of the present disclosure. 9 illustrates a method of operation of the base station 110-2.

Referring to FIG. 9, in step 901, the base station transmits information about resources for packet replication. The information about the resource is transmitted to the first terminal (e.g., the terminal 120) and the second terminal (e.g., the terminal 130), and the resources indicated to the first terminal and the resources indicated to the second terminal are at least partially overlapped. That is, the resources for packet replication include common resources that are commonly allocated by the first terminal and the second terminal. Accordingly, the resources allocated to the first terminal and the second terminal are used competitively. At this time, the resources for packet replication may belong to the same band or carrier as the dedicated resource allocated by another base station, or may belong to another band or carrier (e.g., license-exempt band or carrier).

In step 903, the base station receives data of either the first terminal or the second terminal through the resources. Since the shared resource is used competitively by the first terminal and the second terminal, the sender of the data, that is, the source may be changed depending on the result of the competition.

In step 905, the base station transmits the received data to another base station. Here, the data may include a PDCP packet or an RLC packet. The received data may be transmitted to another base station and then removed depending on the success of receiving a packet through a dedicated resource of another base station.

Although not shown in FIG. 9, according to another embodiment, a base station may transmit information on a rule for determining control parameters for channel occupation in a shared resource to terminals. For example, information about a rule may define a mapping relationship between information about a dedicated resource (e.g., channel quality) and a control parameter. Alternatively, according to another embodiment, the base station may transmit information indicating control parameters determined by the rules. That is, the base station may transmit at least one of information on a rule for determining a control parameter or information indicating a control parameter determined by the rule.

10 shows a flow diagram of a terminal performing packet replication in a wireless communication system in accordance with various embodiments of the present disclosure. 10 illustrates an operation method of the terminal 120. FIG.

Referring to FIG. 10, in step 1001, the terminal receives information on a first resource and a second resource. Here, the first resource may include dedicated resources allocated specifically to the UE, and the second resource may include shared resources commonly allocated to other UEs (e.g., the UE 130). According to one embodiment, information about the first resource and information about the second resource may be received from different base stations (e.g., base station 110-1 and base station 110-2).

In step 1003, the terminal transmits data through the first resource. Since the first resource is allocated only to the UE, the UE can transmit data without competition.

In step 1005, the terminal transmits data through the second resource based on the control parameter determined based on the information on the first resource. According to one embodiment, the terminal may receive information about the rules for determining the control parameters from the base station and determine the control parameters based on the rules. According to another embodiment, the terminal may receive information indicating control parameters from the base station. Here, the control parameter indicates at least one of a time length (e.g., a time length or a CCA slot number in which a clear channel should be observed) or a maximum value and a minimum value of a time length in which a channel before a packet transmission should be observed in a second resource Information. However, since the second resource is used in competition with another terminal, the terminal may fail to transmit data through the second resource.

In the embodiments described with reference to Figures 8, 9 and 10, data received via the shared resource is moved between two different base stations. That is, the above embodiments assume a DC structure or a CA structure provided by different base stations. However, according to another embodiment, in case of a CA structure in which one base station provides a plurality of carriers, the base station in Fig. 8 and the base station in Fig. 9 are the same, and in Fig. 10, Can be received from one base station. In this case, steps 807 and 905 may be replaced with signal processing in the base station.

By using the shared resources according to the embodiments described with reference to Figs. 8, 9, and 10, resource efficiency in performing packet replication can be improved. The resource usage by using the shared resource will be described below with reference to FIG.

11 illustrates an example of resource usage in performing packet replication using shared resources in a wireless communication system in accordance with various embodiments of the present disclosure. Referring to FIG. 5, the terminal 120 and the terminal 130 attempt packet replication. The base station 110-1 allocates resource # 1 1110 and resource # 2 1120 as dedicated resources. Base station 110-2 allocates resource # 3 1130 as a shared resource. Compared with the case described with reference to FIG. 8B, the embodiment of FIG. 8B allocates two dedicated resources per terminal, while the embodiment of FIG. 11 allocates one shared resource in addition to one dedicated resource per terminal . That is, the embodiment of FIG. 8B requires four resources, and the embodiment of FIG. 11 requires three resources. Therefore, it is confirmed that the packet replication operation using the shared resource uses less resources than the packet replication operation using only the dedicated resource. The present disclosure below describes specific operations of the packet replication operation.

12 illustrates signal exchange for packet replication using shared resources in a wireless communication system in accordance with various embodiments of the present disclosure. 12 illustrates a case where two UEs use a shared resource in a DC state by two base stations.

Referring to FIG. 12, the BS 110-1 transmits an uplink grant to the MS 120 in step 1201, and transmits an uplink grant to the MS 130 in step 1203. FIG. That is, the base station 110-1 allocates the dedicated resource # 1 to the terminal 120 and allocates the dedicated resource # 2 to the terminal 130 for packet replication. For this, the uplink grant transmitted in step 1201 includes allocation information for resource # 1, and the uplink grant transmitted in step 1203 includes information on resource # 2.

The base station 110-2 transmits the uplink grant to the terminal 120 in step 1205 and transmits the uplink grant to the terminal 130 in step 1207. [ That is, the base station 110-2 allocates the resource # 3 as one shared resource to the terminal 120 and the terminal 130 for packet replication. For this, the uplink grants transmitted in steps 1205 and 1207 include information on the resource # 3. According to one embodiment, the information on the resource # 3 may have the same format as the information on the resource # 1 or the resource # 2 transmitted in the step 1201 or 1203. According to another embodiment, the information on the resource # 3 may have a different format from the information on the resource # 1 or the resource # 2. For example, information on the band, candidate resource, etc. of the shared resource is transmitted in advance through separate signaling, and information on the resource # 3 transmitted in steps 1205 and 1207 includes only the additional information necessary for using the resource # 3 .

Thereafter, in step 1209, the terminal 120 replicates the packet. In step 1211, the terminal 130 replicates the packet. That is, the PDCP layer of the terminal 120 replicates one PDCP packet with a packet to be transmitted to the base station 110-1 and a packet to be transmitted to the base station 110-2. The PDCP layer of the terminal 130 replicates one PDCP packet with a packet to be transmitted to the base station 110-1 and a packet to be transmitted to the base station 110-2.

In step 1213, the terminal 120 transmits the packet to the base station 110-1. That is, the terminal 120 transmits the copied packet to the base station 110-1 through the resource # 1. In step 1215, the terminal 130 transmits the packet to the base station 110-1. That is, the terminal 130 transmits the duplicated packet to the base station 110-1 through the resource # 2.

In steps 1217 and 1219, the terminal 120 and the terminal 130 perform the LBT. In other words, the terminal 120 and the terminal 130 perform an LBT for transmitting the copied packet to the base station 110-2 through the resource # 3 which is a shared resource. Specifically, each of the terminal 120 and the terminal 130 generates a random number within a range determined by the LBT control parameter, and monitors the channel occupancy of another apparatus for a duration corresponding to the random number. As a result of the monitoring, if it is confirmed that the channel is empty during the corresponding time length of the random number, the terminal (e.g., the terminal 120 or the terminal 130) confirming the channel can transmit the packet. In this case, the unit of time length may be a CCA slot, and an empty channel may mean that no other signal larger than a predetermined threshold value is detected. Here, the threshold value may be referred to as the CCA threshold value.

That is, the terminal 120 and the terminal 130 perform channel sensing during a selected number of CCA slots before performing transmission of a packet through the resource # 3, and observe a clear channel, that is, Lt; RTI ID = 0.0 > CCA < / RTI > threshold. FIG. 12 illustrates a case where the terminal 120 performs a CCA during four CCA slots and the terminal 130 is configured to perform a CCA during eight CCA slots. The terminal 120 and the terminal 130 start the CCA at a time determined by the base station or a time determined by the implementation of the terminal 120. [ If the terminal 120 observes the clear channel by performing channel sensing during the four CCA slots, the terminal 120 transmits the duplicated packet to the base station 110-2 through the resource # 3, which is a shared resource. In this case, the terminal 130 observes a busy channel, that is, a state where the magnitude of the measured interference is larger than the CCA threshold due to the transmission of the terminal 120. Therefore, the terminal 130 can not watch the clear channel during the eight CCA slots and can not transmit the replicated packet to the base station 110-2 through the resource # 3. In this example, in step 1221, the terminal 120 transmits a packet.

In step 1223, the base station 110-2 transmits the data to the base station 110-1. That is, the base station 110-2 transmits the packet received through the resource # 3 to the base station 110-1 after PHY / MAC / RLC processing. In step 1225, the base station 110-1 removes the duplicated packet. Specifically, the base station 110-1 performs a duplicated packet removal operation on the packets received through the resources # 1 and # 2 and the packet received from the base station 110-2, and then transmits the successfully received packet To the upper layer.

In the LBT operation described with reference to FIG. 12, the terminals perform channel sensing by the number of CCA slots. According to the concrete implementation of the LBT, the channel sensing of the terminal can be further performed. For example, the UE may further operate the defer period. In particular, if the channel unuse is confirmed during a delay period having a predetermined length of time, the terminal 120 and the terminal 130 can observe the availability of the channel during the CCA slots based on the random number.

In the embodiment described with reference to FIG. 12, the terminal 120 observes the clear channel during four CCA slots before transmitting the duplicated packet through the resource # 3 which is the shared resource, and the terminal 130 replies through the resource # 3 We had to observe the clear channel during the eight CCA slots before sending the packet. Here, the smaller the number of CCA slots of the clear channel to be observed before transmitting the duplicated packet, the greater the probability of performing transmission through the shared resource. Thus, according to various embodiments, the number of CCA slots that must be observed before transmitting a packet on a shared resource may be determined according to at least one of the following principles.

First, the higher the likelihood of packet transmission / reception failure in a dedicated resource, the more likely it is to use the shared resource by setting the clear channel to be observed during a small number of CCA slots.

Second, the higher the importance of the packet to be transmitted, the more clear the channel is observed during a small number of CCA slots, thereby increasing the availability of the shared resource.

Third, the higher the user class of the UE, the more the CCA slots are observed for clear channel observation, thereby increasing the availability of shared resources.

In order to control the number of CCA slots according to the probability of packet transmission / reception failure in the first principle, dedicated resource, it is required to estimate the possibility of packet reception failure in a dedicated resource. In one example, a transmission failure of a packet can be estimated based on channel information for a dedicated resource. At this time, according to various embodiments, channel information can be utilized variously. Hereinafter, the use of channel information will be described with reference to FIG.

13 illustrates an example of a change in channel gain in a wireless communication system in accordance with various embodiments of the present disclosure. In Fig. 13, the horizontal axis represents time, and the vertical axis represents channel gain, and a change in channel gain with time is shown. 13 illustrates various indicators 1310, 1320, 1330, 1340 that may be used to determine the number of CCA slots.

According to one embodiment, the lower the channel gain 1310 in the dedicated resource at the scheduling time, the fewer the number of CCA slots can be allocated. This is because the lower the channel gain between the terminal and the base station is, the higher the possibility of packet transmission failure in the dedicated resource is high.

According to another embodiment, the lower the channel gain 1320 in the dedicated resource at the most recently fed back channel gain, the less number of CCA slots may be allocated. This is because the lower the channel gain between the terminal and the base station is, the higher the possibility of packet transmission failure in the dedicated resource is high.

According to another embodiment, the larger the time interval 1330 between the scheduling point and the most recent channel gain feedback point, the fewer CCA slots can be allocated. This is because the longer the time elapses after the terminal feedbacks the channel gain to the base station, the more likely it is that the channel gain is no longer valid for the base station. The channel gain at the scheduling time point may be improved or worse than the feedback time point. If the channel gain is improved, it is not a problem. However, if the channel gain is worse, the probability of packet transmission / reception failure in the dedicated resource may increase. Therefore, the larger the time interval 1330 between the scheduling time and the most recent channel gain feedback, the fewer number of CCA slots can be allocated.

According to another embodiment, the smaller the amount 1340 of the channel gain at the scheduling time or the most recently fed back channel gain versus the channel gain most recently measured by the UE, the less number of CCA slots can be allocated. The channel gain at the scheduling time point may be improved or worse than the feedback time point. If the channel gain is improved, it is not a problem. However, if the channel gain is worse, the probability of packet transmission / reception failure in the dedicated resource may increase. Accordingly, as the channel gain at the scheduling time or the amount 1340 of the channel gain most recently fed back compared to the channel gain most recently measured by the UE is greater, a smaller number of CCA slots can be allocated.

The importance of the packet must be determined to control the number of CCA slots according to the second principle, the importance of the packet to be transmitted. The importance of a packet can be determined based on various factors such as the operator's policy and technical basis. As an example, the importance of a packet can be determined according to the type of service. Here, the type of the service can be classified according to at least one of the real time, the required delay time, the length of the slot to be used, and the presence or absence of urgency. As another example, the importance of a packet can be determined depending on whether it is a retransmission packet or not.

In order to control the number of slots according to the user class of the terminal, which is the third principle, the base station must obtain the user class information of the terminal. The base station can receive information on the user class of each terminal from another node that manages subscriber information. Alternatively, the base station can check the user class based on the context information of the terminal acquired at the initial connection of the terminal.

According to various embodiments, at least one of the rules for determining the number of CCA slots described above may be applied to the shared resource. To this end, the rules between the base station and the terminals must be shared, or the results determined by one party must be shared with the other party. When the rule itself is shared, specifically, the following information may be provided from the base station to the terminal.

According to an exemplary embodiment, when a channel gain of a dedicated resource is lower at a scheduling time and a smaller number of CCA slots are allocated, a base station can provide information as shown in Table 1 below.

Channel gain
(Reference signal intensity) Number of CCA slots
(Or the range of the number of CCA slots)
(Or channel priority class) RSRP1 < X &lt; RSRP2 Y = Ka
(K1 < Y &lt; K2)
(p = 1) RSRP2 < X &lt; RSRP3 Y = Kb
(K2 < Y &lt; K3)
(p = 2) RSRP3 < X &lt; RSRP4 Y = Kc
(K3 < Y &lt; K4)
(p = 3) ... ...

In Table 1, X denotes the channel gain of the dedicated resource at the scheduling time, Y denotes the number of CCA slots or the number of CCA slots, and p denotes a channel access priority class. The unit of reference signal received power (RSRP) 1, RSRP2, RSRP3, and RSRP4 may be dBm. Here, the RSRP may be replaced with one or a combination of a reference signal received quality (RSRQ), a signal to interference and noise ratio (SINR), and a received signal strength indicator (RSSI).

According to another embodiment, when a terminal is feedbacking a channel gain most recently, when a channel gain of a dedicated resource is lower and a smaller number of CCA slots are allocated, the base station can provide information as shown in Table 2 have.

Channel gain
(Reference signal intensity) Number of CCA slots
(Or the range of the number of CCA slots)
(Or channel priority class) RSRP1 < X &lt; RSRP2 Y = Ka
(K1 < Y &lt; K2)
(p = 1) RSRP2 < X &lt; RSRP3 Y = Kb
(K2 < Y &lt; K3)
(p = 2) RSRP3 < X &lt; RSRP4 Y = Kc
(K3 < Y &lt; K4)
(p = 3) ... ...

In Table 2, X denotes the channel gain of the dedicated resource at the time of latest feedback of the channel gain, Y denotes the number of CCA slots or the number of CCA slots, p denotes a channel access priority class, . The unit of RSRP1, RSRP2, RSRP3, RSRP4 may be dBm. Here, RSRP may be replaced by one or a combination of RSRQ, SINR, and RSSI.

According to another embodiment, when a smaller number of CCA slots are allocated as the time interval between the scheduling point and the terminal's latest feedback of the channel gain is larger, the base station can provide information as shown in Table 3 have.

Channel feedback elapsed time Number of CCA slots
(Or the range of the number of CCA slots)
(Or channel priority class) N1 < X &lt; N2 Y = Ka
(K1 < Y &lt; K2)
(p = 1) N2 < X &lt; N3 Y = Kb
(K2 < Y &lt; K3)
(p = 2) N3 < X &lt; N4 Y = Kc
(K3 < Y &lt; K4)
(p = 3) ... ...

In Table 3, X is the time interval between the scheduling point and the UE's most recent channel gain feedback, Y is the number of CCA slots or the number of CCA slots, p is a channel access priority class priority class). The unit of N1, N2, N3, N4 may be a subframe or ms.

According to another embodiment, when a smaller number of CCA slots are allocated as a channel gain at a scheduling time point or a channel gain most recently measured by the UE is compared with a decrease amount of a channel gain most recently fed back, Table 4].

Channel gain reduction Number of CCA slots
(Or the range of the number of CCA slots)
(Or channel priority class) D1 < X &lt; D2 Y = Ka
(K1 < Y &lt; K2)
(p = 1) D2 < X &lt; D3 Y = Kb
(K2 < Y &lt; K3)
(p = 2) D3 < X &lt; D4 Y = Kc
(K3 < Y &lt; K4)
(p = 3) ... ...

In Table 4, X is the amount of decrease in the channel gain at the scheduling time or the most recently fed back channel gain compared to the channel gain most recently measured by the UE, Y is the number of CCA slots or the number of CCA slots, p denotes a channel access priority class. The units of D1, D2, D3, and D4 may be dB.

Information such as the master information block (SIB), the system information block (SIB), the RRC signaling, the MAC CE a control element, or the like. Alternatively, information such as Table 1, Table 2, Table 3, and Table 4 can be shared by being defined in the specification without signaling.

14 shows a flowchart of a base station for managing parameters related to occupancy of shared resources in a wireless communication system in accordance with various embodiments of the present disclosure; 14 illustrates an operation method of the base station 110-1 or the base station 110-2, in which the base station provides information on rules for determining LBT parameters (e.g., the number of CCAs slots or the range of numbers).

Referring to FIG. 14, in step 1401, the base station provides an LBT parameter setting rule. In other words, the base station transmits information about a rule for setting an LBT parameter to be applied to uplink transmission through a shared resource during packet replication to the terminal (e.g., the terminal 120 and the terminal 130). Information on the rules for setting the LBT parameters can be variously configured according to the allocation principle of the CCA slots described above. The rules for setting the LBT parameters indicate the number or the number of CCA slots corresponding to the indicator associated with the dedicated resource (e.g., channel gain, reduced size, etc.). Here, the number or the range of the number of CCA slots can be expressed by a channel access priority class. For example, information on rules for setting LBT parameters can be configured as at least one of Table 1, Table 2, Table 3, and Table 4.

In step 1403, the base station receives information on the channel gain from the terminal. Here, the channel gain is channel information for a dedicated resource. Information on the channel gain may be received periodically or aperiodically.

In step 1405, the BS performs scheduling for packet replication of the MS. Here, the scheduling includes selection, i.e., pairing, of terminals to compete in one shared resource. That is, after a plurality of (e.g., two) terminals are paired with each other, the base station allocates dedicated resources to each terminal and allocates one shared resource commonly used to a plurality of terminals.

In step 1407, the base station processes the duplicated packets. That is, when the UE performs uplink transmission through packet replication, the base station performs a duplicated packet removal operation on packets received through a plurality of dedicated resources and packets received through one shared resource. Then, the base station transmits the successfully received packet to the upper layer.

In the embodiment described with reference to FIG. 14, the base station pairs terminals that will use the shared resource. Various embodiments for pairing are as follows.

According to an embodiment, the BS may pair the MSs based on the channel gain information received from the MS. Specifically, the base station can pair a terminal whose channel gain is equal to or greater than a threshold value and a terminal whose threshold value is less than a threshold value.

According to another embodiment, the base station may pair the terminals based on the channel gain information received from the terminal. Specifically, the base station can pair the two terminals with a difference in channel gains greater than or equal to a threshold value.

According to yet another embodiment, the base station may pair the terminals based on the feedback time of the channel information from the terminal. Specifically, the BS may pair a UE having an elapsed time between a scheduling time point and a channel feedback time point with a threshold value or more and a UE having a threshold value or less.

According to yet another embodiment, the base station may pair the terminals based on the feedback time of the channel information from the terminal. Specifically, the BS may pair the two UEs whose difference between the scheduling time and the channel feedback time is greater than or equal to the threshold value.

According to another embodiment, the base station may pair any two terminals.

15 shows a flow diagram of a terminal for determining parameters related to occupancy of a shared resource in a wireless communication system according to various embodiments of the present disclosure; 15 illustrates an operation method of the terminal 120 or the terminal 130, in which the base station provides information on a rule for determining LBT parameters (e.g., the number of CCAs slots or the range of numbers).

Referring to FIG. 15, in step 1501, the terminal receives an LBT parameter setting rule from a base station (e.g., the base station 110). In other words, the UE receives information on the configuration rule of the LBT parameter to be applied to uplink transmission through the shared resource during packet replication.

In step 1503, the terminal transmits channel information. That is, the terminal feeds back information on the channel gain to the base station. Here, the channel gain is channel information for a dedicated resource. Information on the channel gain may be received periodically or aperiodically.

In step 1505, the UE receives the scheduling information. The scheduling information includes allocation information for dedicated resources and allocation information for shared resources. Dedicated and shared resources may belong to the same band or carrier, or may belong to different bands or carriers.

In step 1507, the terminal determines an LBT parameter. The UE may determine an LBT parameter (e.g., CCA slot number) to be applied to transmission in the shared resource based on the rule received in step 1501. [ Specifically, the UE determines whether the LBT parameter to be applied to the uplink transmission through the shared resource based on at least one of the LBT parameter setting rule provided from the base station, the channel information fed back to the base station, the scheduling time, That is, the number of CCA slots. If the LBT parameter setting rules provided by the base station define a range of the number of CCA slots, the terminal may select a random number within the range and determine the number of CCA slots based on the random number.

In step 1509, the UE performs uplink transmission. That is, it transmits the duplicated packet through the dedicated resource allocated from the base station. If the clear channel is successfully observed during the given CCA slots according to the LBT result, the UE can transmit the duplicated packet through the shared resource. On the other hand, if the clear channel is not successfully observed during the given CCA slots according to the LBT result, the UE fails to transmit the duplicated packet through the shared resource.

16 illustrates signaling in the case where a control parameter for occupancy of a shared resource in a wireless communication system according to various embodiments of the present disclosure is determined by a terminal. 16 illustrates a case where two UEs use shared resources in a DC situation by two base stations.

Referring to FIG. 16, the base station 110-1 or the base station 110-2 performs signaling on the mapping rule. In other words, at least one of the base station 110-1 and the base station 110-2 transmits information on a rule for determining a control parameter regarding the occupation of the shared resource. The mapping rule may indicate the clear channel observation time (e.g., the number or range of CCA slots) of the shared resource corresponding to the indicator associated with the dedicated resource (e.g., channel gain, reduced size, etc.).

In step 1603, the base station 110-1 transmits the uplink grant to the terminal 120, and transmits the uplink grant to the terminal 130 in step 1605. [ That is, the base station 110-1 allocates the dedicated resource # 1 to the terminal 120 for packet replication and allocates the dedicated resource # 2 to the terminal 130. [ For this, the uplink grant transmitted in step 1603 includes allocation information for resource # 1, and the uplink grant transmitted in step 1605 includes information on resource # 2.

The base station 110-2 transmits the uplink grant to the terminal 120 in step 1607 and transmits the uplink grant to the terminal 130 in step 1609. [ That is, the base station 110-2 allocates the resource # 3 as one shared resource to the terminal 120 and the terminal 130 for packet replication. For this, the uplink grants transmitted in steps 1607 and 1609 include information on the resource # 3.

Thereafter, in step 1611, the terminal 120 replicates the packet. In step 1613, the terminal 130 replicates the packet. That is, the PDCP layer of the terminal 120 replicates one PDCP packet with a packet to be transmitted to the base station 110-1 and a packet to be transmitted to the base station 110-2. The PDCP layer of the terminal 130 replicates one PDCP packet with a packet to be transmitted to the base station 110-1 and a packet to be transmitted to the base station 110-2.

In step 1615, the terminal 120 transmits the packet to the base station 110-1. That is, the terminal 120 transmits the copied packet to the base station 110-1 through the resource # 1. In step 1617, the terminal 130 transmits the packet to the base station 110-1. That is, the terminal 130 transmits the duplicated packet to the base station 110-1 through the resource # 2.

In step 1619, the terminal 120 determines an LBT parameter. In step 1621, the terminal 130 determines an LBT parameter. That is, each of the terminal 120 and the terminal 130 determines a control parameter to be applied to transmission in the resource # 3, which is a shared resource, based on the mapping rule received in step 1601. [

In steps 1623 and 1625, the terminal 120 and the terminal 130 perform LBT. In other words, the terminal 120 and the terminal 130 perform an LBT for transmitting the copied packet to the base station 110-2 through the resource # 3 which is a shared resource. That is, before transmitting the packet through the resource # 3, the terminal 120 and the terminal 130 perform channel sensing based on the LBT parameter determined in steps 1619 and 1621, and the terminal 120 observing the clear channel transmits the packet do. In this case, in step 1627, the terminal 120 transmits a packet.

In step 1629, the base station 110-2 transmits data to the base station 110-1. That is, the base station 110-2 transmits the packet received through the resource # 3 to the base station 110-1 after PHY / MAC / RLC processing. In step 1631, the base station 110-1 removes the duplicated packet. Specifically, the base station 110-1 performs a duplicated packet removal operation on the packets received through the resources # 1 and # 2 and the packet received from the base station 110-2, and then transmits the successfully received packet To the upper layer.

In the embodiment described with reference to FIG. 16, the base station informs the terminal of a rule for setting an LBT parameter to be applied to uplink transmission through a shared resource during packet replication. That is, if the channel gain, the channel feedback time, and the like satisfy the predefined condition, the UE observes the clear channel during a certain number of CCA slots or a selected number of CCA slots within a given range, Uplink transmission through the shared resource can be performed.

According to one embodiment, the base station may advertise the channel access priority class. That is, if the channel gain or the channel feedback time is satisfied by notifying the terminal of the LBT parameter setting rule, the base station can control the terminal to determine the number of CCA slots according to the corresponding channel access priority class . An example of the channel access priority class is shown in Table 5.

Channel access priority class Competition window One [1, 7] 2 [1, 15] 3 [1, 31] 4 [1, 63]

The UE selects a random number within a contention window (CW) corresponding to its channel access priority class and observes a clear channel during a number of CCA slots corresponding to the random number. Then, according to the observation result, the terminal can transmit a packet from the shared resource. As a more specific example, an example of a channel access priority class defined in 3GPP TS (technical specificaitons) 36.213 is shown in Table 6.

Channel access priority class (p) CW _{min, p} CW _{max, p} Allowable CW _p Size One One 7 {3, 7} 2 2 15 {7, 15} 3 3 63 {15, 31, 63} 4 7 1023 {15, 31, 63, 127, 255, 511, 1023}

In Table 6, CW _{min, p} is the minimum value of the contention window when the channel access priority class is p, CW _{max, p} is the maximum value of the contention window when the channel access priority class is p, CW _p is random Means the size of the selected contending window. The size of the contention window corresponds to the number of CCA slots.

According to various embodiments, the size of the contention window may vary depending on the success of the competition. For example, a terminal that fails to observe a clear channel due to transmission of another terminal and fails to transmit through a shared resource can double the size of a contention window. As a specific example, when p = 3, the terminal initially selects the number of CCA slots between [1, 15]. At this time, if the UE fails to transmit through the shared resource, the UE selects the number of CCA slots between [1, 31]. Also, if the transmission through the shared resource fails, the terminal selects the number of CCA slots between [1, 63]. If the UE performs transmission via the shared resource, it can select the number of CCA slots between the smallest CW _max , i.e., [1, 15].

In the case of the embodiment described with reference to FIG. 16, the base station provides mapping information to the mobile station, i.e., a mapping between channel gain or scheduling and the number of CCA slots and the number of CCA slots, and the mobile station determines the number of CCA slots. According to another embodiment, the BS may indicate the number (or range or channel access priority class) of the CCA slots to be used by the UEs in performing the LBT through the uplink grant after scheduling the shared resource. That is, a control parameter regarding the occupation of the shared resource can be determined by the base station. An embodiment in which a control parameter relating to the occupation of the shared resource is included in the uplink grant will be described with reference to Fig.

Figure 17 illustrates signaling in the case where control parameters for the occupation of shared resources in a wireless communication system in accordance with various embodiments of the present disclosure are determined by a base station. 12 illustrates a case where two UEs use a shared resource in a DC state by two base stations.

Referring to FIG. 12, in step 1701, the base station 110-2 determines an LBT parameter. The base station 110- may determine control parameters regarding the occupation of the shared resource based on information related to the channel for the dedicated resources of the terminal 120 and the terminal 130, according to a predefined mapping rule. At this time, the base station 110-2 can determine control parameters by retreiving the control parameters according to the mapping rule, or by receiving the control parameters retrieved by the base station 110-1.

In step 1703, the base station 110-1 transmits the uplink grant to the terminal 120, and in step 1705, the base station 110-1 transmits the uplink grant to the terminal 130. [ That is, the base station 110-1 allocates the dedicated resource # 1 to the terminal 120 and allocates the dedicated resource # 2 to the terminal 130 for packet replication. For this, the uplink grant transmitted in step 1703 includes allocation information for resource # 1, and the uplink grant transmitted in step 1705 includes information on resource # 2.

The base station 110-2 transmits the uplink grant to the terminal 120 in step 1707 and transmits the uplink grant to the terminal 130 in step 1709. [ That is, the base station 110-2 allocates the resource # 3 as one shared resource to the terminal 120 and the terminal 130 for packet replication. To this end, the uplink grants transmitted in steps 1707 and 1709 include information on the resource # 3. In this case, the uplink grants transmitted in steps 1707 and 1709 include control parameters to be applied to the shared resource, i.e., LBT parameters. For example, the control parameters may include at least one of an observation time length of a clear channel, a number of CCA slots, a range of CCA slot numbers, and a priority class.

Thereafter, in step 1711, the terminal 120 replicates the packet. In step 1713, the terminal 130 replicates the packet. That is, the PDCP layer of the terminal 120 replicates one PDCP packet with a packet to be transmitted to the base station 110-1 and a packet to be transmitted to the base station 110-2. The PDCP layer of the terminal 130 replicates one PDCP packet with a packet to be transmitted to the base station 110-1 and a packet to be transmitted to the base station 110-2.

In step 1715, the terminal 120 transmits the packet to the base station 110-1. That is, the terminal 120 transmits the copied packet to the base station 110-1 through the resource # 1. In step 1717, the terminal 130 transmits the packet to the base station 110-1. That is, the terminal 130 transmits the duplicated packet to the base station 110-1 through the resource # 2.

In steps 1719 and 1721, the terminal 120 and the terminal 130 perform the LBT. In other words, the terminal 120 and the terminal 130 perform an LBT for transmitting the copied packet to the base station 110-2 through the resource # 3 which is a shared resource. That is, before transmitting the packet through the resource # 3, the terminal 120 and the terminal 130 perform channel sensing based on the LBT parameter determined in steps 1619 and 1621, and the terminal 120 observing the clear channel transmits data do. In this example, in step 1723, the terminal 120 transmits a packet.

In step 1725, the base station 110-2 transmits the data to the base station 110-1. That is, the base station 110-2 transmits the packet received through the resource # 3 to the base station 110-1 after PHY / MAC / RLC processing. In step 1727, the base station 110-1 removes the duplicated packet. Specifically, the base station 110-1 performs a duplicated packet removal operation on the packets received through the resources # 1 and # 2 and the packet received from the base station 110-2, and then transmits the successfully received packet To the upper layer.

According to various embodiments described above, a terminal performing a packet replication operation can transmit packets using dedicated resources and shared resources. According to various embodiments, packet replication using shared resources may optionally be performed. In other words, a packet replication operation using only dedicated resources and a packet replication operation using dedicated resources and shared resources can be selectively performed depending on the situation. Further, the packet replication operation can be selectively performed. Hereinafter, a procedure for selectively controlling whether or not to perform the packet replication operation and whether to use the shared resource will be described with reference to FIG.

18 shows a flowchart of a base station selectively performing packet replication operations in a wireless communication system according to various embodiments of the present disclosure. 18 illustrates an operation method of the base station 110-1 or the base station 110-2. FIG. 18 is a procedure for determining whether to replicate a packet to a terminal and whether to use the shared resource. If there are a plurality of terminals, the procedure of FIG. 18 may be repeated.

Referring to FIG. 18, in step 1801, the BS determines service characteristics of a terminal (e.g., terminal 120, terminal 130). The service characteristic may include at least one of a real time availability, a requested delay time, a required transmission rate, required reliability, a length of a used slot, and urgency.

In step 1803, the BS determines whether to perform a packet replication operation for the MS. According to an exemplary embodiment, the BS may determine whether to perform a packet replication operation based on a service used by the MS. For example, the base station can determine whether to perform the packet replication operation based on the degree of reliability requested by the service, the requested delay time, and the like.

If the packet copying operation is not required, the base station controls the mobile station to operate without packet replication in step 1805. In other words, the base station configures the terminal to disable the packet replication function. For example, if the service used by the UE is a BE (best effort) service that does not require reliability or low delay, the BS may not apply packet replication to the UE. That is, the BS may apply a scheme of assigning a dedicated resource to the MS.

On the other hand, if the packet replication operation is not required, the base station determines whether the shared resource is used. According to an exemplary embodiment, a BS may determine whether to use a shared resource based on a service used by the MS, a user class of the MS, and the like. For example, the base station can determine whether to use the shared resource based on the degree of reliability requested by the service, the requested delay time, and the like.

If the shared resource is used, the base station controls the terminal to perform packet replication using the shared resource in step 1809. In other words, the base station configures the terminal to enable the packet replication function using the shared resource. For example, if the service used by the terminal requires normal reliability or a normal delay, the base station may notify the terminal of packet replication according to the embodiment of the present disclosure, that is, The method of allocating resources can be applied.

On the other hand, if the shared resource is not used, in step 1811, the base station controls the terminal to perform packet replication using only dedicated resources. In other words, the base station configures the terminal to enable the packet replication function without a shared resource. For example, when a service used by a terminal requires very high reliability or very low latency, the base station transmits a general packet replica, i.e., a plurality of dedicated resources (e.g., one dedicated resource per cell) Can be applied.

According to the embodiment described with reference to FIG. 18, the base station can classify the terminals. In other words, the base station can classify the plurality of stages into three pools by repeating the procedure of FIG. 18, and then perform the scheduling. At this time, the base station can perform pairing with respect to the terminals performing packet replication using the shared resource.

Methods according to the claims of the present disclosure or the embodiments described in the specification may be implemented in hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored on a computer-readable storage medium are configured for execution by one or more processors in an electronic device. The one or more programs include instructions that cause the electronic device to perform the methods in accordance with the embodiments of the present disclosure or the claims of the present disclosure.

Such programs (software modules, software) may be stored in a computer readable medium such as a random access memory, a non-volatile memory including flash memory, a read only memory (ROM), an electrically erasable programmable ROM but are not limited to, electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs An optical storage device, or a magnetic cassette. Or a combination of some or all of these. In addition, a plurality of constituent memories may be included.

The program may also be stored on a communication network, such as the Internet, an Intranet, a local area network (LAN), a wide area network (WAN), a communication network such as a storage area network (SAN) And can be stored in an attachable storage device that can be accessed. Such a storage device may be connected to an apparatus performing an embodiment of the present disclosure via an external port. Further, a separate storage device on the communication network may be connected to an apparatus performing the embodiments of the present disclosure.

In the specific embodiments of the present disclosure described above, the elements included in the disclosure have been expressed singular or plural, in accordance with the specific embodiments shown. It should be understood, however, that the singular or plural representations are selected appropriately according to the situations presented for the convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, And may be composed of a plurality of elements even if they are expressed.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present disclosure should not be limited to the embodiments described, but should be determined by the scope of the appended claims, as well as the appended claims.

Claims (20)

A method of operating a terminal in a wireless communication system,
Receiving information on a first resource and information on a second resource shared with at least one other terminal;
Transmitting a packet through the first resource;
And transmitting the packet over the second resource based on the control parameter determined based on the information related to the first resource.
The method according to claim 1,
And receiving information about a rule for determining the control parameter.
The method according to claim 1,
Wherein the information about the second resource includes the control parameter.
The method according to claim 1,
The control parameter may include information indicating at least one of a time length in which the channel before the packet transmission is to be observed in the second resource or a maximum value and a minimum value of the time length.
The method according to claim 1,
Wherein the control parameter is determined based on at least one of a success rate of packet transmission on the first channel, channel information on the first channel, importance of the packet, and a rating of the terminal.
A method of operating a base station in a wireless communication system,
Transmitting information about a resource shared with a second terminal to a first terminal;
Transmitting information about a resource shared with the first terminal to the second terminal;
And receiving the first terminal or the second terminal rotor packet through the resource,
Wherein the sender of the packet includes a first control parameter determined based on information related to a first dedicated resource allocated to the first terminal and a second control parameter determined based on information related to a second dedicated resource allocated to the second terminal A method that depends on parameters.
The method of claim 6,
And transmitting information about a rule for determining the first control parameter and the second control parameter.
The method of claim 6,
Wherein the information about the resource includes the first control parameter or the second control parameter.
The method of claim 6,
The first terminal and the second terminal share the resource based on the first channel information of the first terminal for the first dedicated resource and the second channel information of the second terminal for the second dedicated resource &Lt; / RTI &gt; further comprising the step of deciding what to do.
The method according to claim 1,
Further comprising the step of enabling a packet replication operation for the first terminal based on at least one of a characteristic of a service provided to the first terminal and a user class.
A terminal apparatus in a wireless communication system,
A transmission / reception unit,
And at least one processor coupled to the transceiver,
Wherein the transceiver is configured to receive information on a first resource and a second resource shared with at least one other terminal, transmit the packet through the first resource, and transmit the packet based on information related to the first resource And transmit the packet over the second resource based on the determined control parameter.
The method of claim 11,
Wherein the transmitting and receiving unit receives information on a rule for determining the control parameter.
The method of claim 11,
Wherein the information about the second resource comprises the control parameter.
The method of claim 11,
The control parameter may include information indicating at least one of a time length in which the channel before the packet transmission is to be observed in the second resource or a maximum value and a minimum value of the time length.
The method of claim 11,
Wherein the control parameter is determined based on at least one of a success rate of packet transmission on the first channel, channel information on the first channel, importance of the packet, and a rating of the terminal.
A base station apparatus in a wireless communication system,
A transmission / reception unit,
And at least one processor coupled to the transceiver,
The transmitting and receiving unit transmits information about a resource shared with the second terminal to the first terminal, transmits information about resources shared with the first terminal to the second terminal, Or the second terminal rotor packet,
Wherein the sender of the packet includes a first control parameter determined based on information related to a first dedicated resource allocated to the first terminal and a second control parameter determined based on information related to a second dedicated resource allocated to the second terminal Device dependent on parameters.
18. The method of claim 16,
Wherein the transmission / reception unit transmits information on a rule for determining the first control parameter and the second control parameter.
18. The method of claim 16,
Wherein the information about the resource includes the first control parameter or the second control parameter.
18. The method of claim 16,
Wherein the at least one processor is configured to determine the first channel and the second channel based on the first channel information of the first terminal for the first dedicated resource and the second channel information of the second terminal for the second dedicated resource, 2 &lt; / RTI &gt; terminal to share the resource.
The method of claim 11,
Wherein the at least one processor activates a packet replication operation for the first terminal based on at least one of a property of a service provided to the first terminal and a user class.

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