user method and equipment for receiving downlink signals

专利摘要:
A user equipment (UE) initiates a downlink (DL) discontinuous reception (DRX) retransmission timer for a DL hybrid automatic request and repeat process from the UE. The UE monitors a physical downlink control channel (PDCCH) while the DRX DL relay timer for the HARQ DL process is running. The UE interrupts the DRX DL retransmission timer for the HARQ DL process when the UE receives a PDCCH indicating an uplink (UL) transmission.
公开号:BR112019019679B1
申请号:R112019019679-0
申请日:2018-03-13
公开日:2020-12-08
发明作者:Jeonggu LEE；Sunyoung Lee；SeungJune Yi
申请人:Lg Electronics Inc；
IPC主号:

专利说明:

TECHNICAL FIELD
[001] The present invention relates to a wireless communication system and, more particularly, to a method and apparatus for receiving downlink signals. BACKGROUND OF THE TECHNIQUE
[002] As an example of a mobile communication system to which the present invention is applicable, a 3rd Generation Partnership Project Long Term Evolution communication system (hereinafter referred to as LTE) is briefly described.
[003] Figure 1 is a view that schematically illustrates a network structure of an E-UMTS as an exemplary radio communication system. An Evolved Universal Mobile Telecommunications System (E-UMTS) is an advanced version of a conventional Universal Mobile Telecommunications System (UMTS) and the basic standardization of the same is underway at 3GPP. E-UMTS can generally be termed as a Long Term Evolution (LTE) system. For details on the technical applications of UMTS and E-UMTS, reference can be made to Version 7 and Version 8 of “3rd Generation Partnership Project; Technical Access Group radio access network ”.
[004] With reference to Figure 1, E-UMTS includes a User Equipment (UE), eNode Bs (eNBs) and an Access Communication Port (AG) that is located at one end of the network (E-UTRAN) and connected to an external network. ENBs can simultaneously transmit data streams to a broadcast service, a selective service and / or a point-to-point broadcast service.
[005] One or more cells can exist by eNB. The cell is defined to operate in one of the bandwidths, such as 1.25, 2.5, 5, 10, 15 and 20 MHz and provides a downlink (DL) or uplink (uplink) transmission service ( UL) for a plurality of UEs in the bandwidth. Different cells can be defined to provide different bandwidth. The eNB controls the transmission or reception of data to and from a plurality of UEs. The eNB transmits DL programming information from DL data to a corresponding UE in order to inform the UE about a time / frequency domain in which the data is supposed to be transmitted, encoding, a data size and information related to the request and repetition hybrid automatic (HARQ). In addition, the eNB transmits UL programming information from UL data to a corresponding UE in order to inform the UE of a time / frequency domain that can be used via the UE, encoding, a data size and HARQ-related information . An Interface to transmit user traffic and control traffic can be used between eNBs. A main network (CN) can include the AG and a network node or similar for user registration of UEs. The AG manages the mobility of a UE on a tracking area (TA) basis. A TA includes a plurality of cells.
[006] Although wireless communication technology was developed for LTE based on multiple access by broadband code division (WCDMA), the demands and expectations and users and service providers are on the rise. In addition, considering other radio access technologies under development, new technological developments are necessary to maintain high competitiveness in the future. Cost per bit reduction, increased service availability, flexible use of frequency bands, a simplified structure, an open interface, adequate power consumption from UEs, and the like are required.
[007] As more and more communication devices require greater communication capacity, there is a need for improved mobile broadband communication compared to the existing RAT. In addition, mass machine-type communication (MTCs), which provides various services by connecting many devices and objects, is one of the biggest problems to consider in next generation communication. In addition, a communication system design that considers a service / UE sensitive to reliability and latency is being discussed. The introduction of next generation RAT, which takes into account advanced mobile broadband communication, massive MTC (mMTC) and ultra-reliable, low-latency communication (URLLC), is being discussed. REVELATION TECHNICAL PROBLEM
[008] Due to the introduction of new radio communication technology, the number of user equipment (UEs) to which a BS must provide a service in a prescribed resource region increases and the amount of data and control information that BS must transmitting to UEs increases. Since the amount of resources available to BS for communication with the UE (s) is limited, a new method in which BS efficiently receives / transmits uplink / downlink data and / or link control information up / down link using limited radio resources is required.
[009] With the development of technologies, overcoming delay or latency has become an important challenge. Applications whose performance critically depends on whether delay / latency are increasing. Consequently, a method is required to reduce delay / latency compared to the legacy system.
[010] In addition, with the development of smart devices, a new scheme is required to transmit / receive a small amount of data or to efficiently transmit / receive data that occurs at a low frequency.
[011] The objectives of the technique that can be achieved through the present invention are not limited to what has been particularly described above in this document and other objectives of the technique not described in this document will be more clearly understood by persons skilled in the art from the following Detailed Description. TECHNICAL SOLUTION
[012] In one aspect of the present invention, a method of receiving downlink signals via user equipment (UE) is provided herein. The method comprises: starting a downlink (DL) discontinuous reception (DRX) retransmission timer for a UE hybrid DL request and automatic repetition process; monitor a physical downlink control channel (PDCCH) while the DRX DL retransmission timer for the HARQ DL process is running; and interrupting the DRX DL retransmission timer for the HARQ DL process when the UE receives a PDCCH indicating an uplink (UL) transmission.
[013] In another aspect of the present invention, user equipment for receiving downlink signals is provided in the present document. The UE comprises: a radio frequency (RF) unit, and a processor configured to control the RF unit. The processor is configured to: initiate a downlink (DL) discontinuous reception (DRX) retransmission timer for a DL hybrid automatic request and repeat process from the UE; monitor a physical downlink control channel (PDCCH) while the DRX DL retransmission timer for the HARQ DL process is running; and interrupting the DRX DL retransmission timer for the HARQ DL process when the UE receives a PDCCH indicating an uplink (UL) transmission.
[014] In each aspect of the present invention, if there are multiple DRX DL relay timers running for multiple HARQ DL processes, all DRX DL relay timers for multiple HARQ DL processes can be stopped when the UE receives the PDCCH indicating the UL transmission.
[015] In each aspect of the present invention, the DRX DL retransmission timer for the HARQ DL process can be interrupted when there is a UL lease configured for a HARQ UL process.
[016] In each aspect of the present invention, the UE may be a UE that operates in half-duplex.
[017] In each aspect of the present invention, the UE can be a narrowband internet of things (NB-IoT) UE.
[018] In each aspect of the present invention, the DRX DL retransmission to the HARQ DL process can be interrupted even when the UE does not receive a PDCCH that indicates a DL transmission to the HARQ DL process.
[019] In each aspect of the present invention, the UE can receive DRX configuration information that includes a value for the DRX DL retransmission timer.
[020] In each aspect of the present invention, the UE can transmit the UL transmission.
[021] The solutions of the above technique are merely some parts of the modalities of the present invention and various modalities in which the features of the technique of the present invention are incorporated can be derived and understood by persons skilled in the art from the following detailed description of the present invention. . ADVANTAGE EFFECTS
[022] According to the present invention, radio communication signals can be efficiently transmitted / received. Therefore, the total throughput of a radio communication system can be improved.
[023] In accordance with an embodiment of the present invention, a low cost / complex UE can communicate with a base station (BS) at low cost while maintaining compatibility with an inherited system.
[024] According to an embodiment of the present invention, the UE can be implemented at low cost / complexity.
[025] In accordance with an embodiment of the present invention, the UE and the BS can carry out communication with each other in a narrow band.
[026] In accordance with an embodiment of the present invention, the delay / latency that occurs during communication between user equipment and a BS can be reduced.
[027] In addition, it is possible to efficiently transmit / receive a small amount of data to smart devices, or to efficiently transmit / receive data that occurs at a low frequency.
[028] According to an embodiment of the present invention, a small amount of data can be transmitted / received efficiently.
[029] It will be appreciated by those skilled in the art that the effects that can be achieved through the present invention are not limited to what was particularly described earlier in the present document and other advantages of the present invention will be more clearly understood from the following detailed description. DESCRIPTION OF THE DRAWINGS
[030] The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and, together with the description, serve to explain the principle of the invention.
[031] Figure 1 is a view that schematically illustrates a network structure of an E-UMTS as an exemplary radio communication system.
[032] Figure 2 is a block diagram that illustrates the network structure of an evolved universal mobile telecommunication system (E-UMTS).
[033] Figure 3 is a block diagram showing the architecture of a typical E-UTRAN and a typical EPC.
[034] Figure 4 is a diagram showing a control plan and a user plan for a radio interface protocol between a UE and an E-UTRAN based on a 3GPP radio access network standard.
[035] Figure 5 is a view showing an example of a physical channel structure used in an E-UMTS system.
[036] Figure 6 schematically illustrates three duplex schemes used in two-way radio communication.
[037] Figure 7 is a diagram for an overview medium access control (MAC) structure on one EU side.
[038] Figure 8 is a diagram showing a concept of discontinuous reception (XRD).
[039] Figure 9 is a diagram showing a method for a DRX operation in the current LTE / LTE-A system.
[040] Figure 10 illustrates DRX timer operations on an UE that supports an HARQ process.
[041] Figure 11 illustrates DRX timer operations on a UE that supports two HARQ processes.
[042] Figure 12 illustrates DRX timer operations in an UE that supports an HARQ process, according to the present invention.
[043] Figure 13 illustrates DRX timer operations in a UE that supports two HARQ processes, in accordance with the present invention.
[044] Figure 14 is a block diagram illustrating elements of a transmission device 100, and a receiving device 200 for implementing the present invention. MODE FOR THE INVENTION
[045] Now, reference will be made in detail to some exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The detailed description, which will be provided below with reference to the accompanying drawings, is intended to explain exemplary modalities of the present invention, rather than showing the only modalities that can be implemented, according to the invention. The following detailed description includes specific details in order to provide a complete understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without these specific details.
[046] In some cases, known structures and devices are omitted or shown in the form of a block diagram, focusing on the important features of the structures and devices, in order not to obscure the concept of the present invention. The same reference numbers will be used throughout this specification to refer to the same or similar parts.
[047] The following techniques, devices and systems can be applied to a variety of wireless multiple access systems. Examples of multiple access systems include a code division multiple access system (CDMA), a frequency division multiple access system (FDMA), a time division multiple access system (TDMA), a orthogonal frequency division multiple access (OFDMA), a single carrier frequency division multiple access system (SC-FDMA), and a multi-port frequency division multiple access system (MC-FDMA). CDMA can be incorporated through radio technology, such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA can be incorporated through radio technology, such as global system for mobile communications (GSM), general packet radio service (GPRS) or advanced data rates for GSM evolution (EDGE). OFDMA can be incorporated through radio technology, such as institute of electrical and electronic engineers (IEEE) 802.11 (WiFi), IEEE 802.16 (WiMAX), IEEE 802.20 or evolved UTRA (E-UTRA). UTRA is part of a universal mobile telecommunications system (UMTS). The long-term evolution (LTE) of a 3rd generation partnership project (3GPP) is part of an evolved UMTS (E-UMTS) using E-UTRA. LTE 3GPP employs OFDMA in DL and SC- FDMA in advanced UL.LTE (LTE-A) is an evolved version of LTE 3GPP. For convenience of description, it is assumed that the present invention is applied to LTE / LTE-A 3GPP. However, the capabilities of the technique of the present invention are not limited to this. For example, although the following detailed description is provided based on a mobile communication system that corresponds to an LTE / LTE-A 3GPP system, aspects of the present invention that are not specific to LTE / LTE-A 3GPP are applicable to others mobile communication systems.
[048] For example, the present invention is applicable to contention-based communication, such as Wi-Fi, as well as non-contention-based communication as in the LTE / LTE-A 3GPP system in which an eNB allocates a time / frequency resource DL / UL in a UE and the UE receives a DL signal and transmits a UL signal, according to the resource allocation of the eNB. In a communication scheme based on non-containment, an access point (AP) or a control node to control the AP allocates a resource for communication between the UE and the AP, while, in a communication scheme based on contention, a communication resource is occupied by the contention between UEs that wish to access the AP. The contention-based communication scheme will now be briefly described. One type of contention-based communication scheme is multiple access with carrier detection (CSMA). CSMA refers to a probabilistic media access control protocol (MAC) to confirm, before a node or a communication device transmits traffic on a shared transmission medium (also called a shared channel), such as a bandwidth. frequency, that there is no other traffic on the same shared transmission medium. In CSMA, a transmitting device determines whether another transmission is taking place before attempting to transmit traffic to a receiving device. In other words, the transmission device attempts to detect the presence of a carrier from another transmission device before attempting to carry out the transmission. Upon detection of the carrier, the transmission device waits for the other transmission device that is carrying out the transmission to finish the transmission, before carrying out the transmission. Consequently, the CSMA can be a communication scheme based on the "detect before transmitting" or "listen before speaking" principle. A scheme to avoid collision between transmission devices in the contention-based communication system using CSMA includes multiple access with collision detection carrier (CSMA / CD) and / or multiple access with carrier impedance detection collision (CSMA / CA). CSMA / CD is a collision detection scheme in a wired local area network (LAN) environment. In CSMA / CD, a personal computer (PC) or a server that wants to communicate in an Ethernet environment first confirms whether the communication takes place on a network and, if another data port device on the network, the PC or server waits, , transmits data. That is, when two or more users (for example PCs, UEs, etc.) transmit data simultaneously, the collision occurs between the simultaneous transmission and CSMA / CD is a scheme to transmit data flexibly by monitoring the collision. A transmission device that uses CSMA / CD adjusts the data transmission of the same by detecting the data transmission performed by another device that uses a specific rule. CSMA / CA is a MAC protocol specified in IEEE 802.11 standards. A wireless LAN (WLAN) system that conforms to 802.11 standards does not use CSMA / CD that was used in IEEE 802.3 standards and uses CA, this is a collision avoidance scheme. The transmission devices always detect the carrier of a network and, if the network is empty, the transmission devices wait for the determined time according to their locations registered in a list and then transmit data. Various methods are used to determine the priority of the transmission devices in the list and to reset the priority. In a system according to some versions of IEEE 802.11 standards, a collision may occur, in which case a collision detection procedure is performed. A transmission device that uses CSMA / CA prevents the collision between data transmission from the same and the transmission of data from another transmission device that uses a specific rule.
[049] In the present invention, the term "suppose" may mean that an entity to transmit a channel transmits the channel according to the corresponding "assumption." This may also mean that an entity to receive the channel receives or decodes the channel from a form that adapts to the "assumption", assuming the channel has been transmitted according to the "assumption".
[050] In the present invention, a user equipment (UE) can be a fixed or mobile device. Examples of the UE include various devices that transmit and receive user data and / or various types of control information to and from a base station (BS). The UE can be called a terminal equipment (TE), a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, an assistant personal digital device (PDA), a wireless modem, a handheld device, etc. In addition, in the present invention, a BS generally refers to a fixed station that communicates with a UE and / or another BS, and exchanges various types of data and control information with the UE and another BS. The BS can be called an advanced base station (ABS), a B-node (NB), an evolved B-node (eNB), a transceiver-base system (BTS), an access point (AP), an processing server (PS), etc. In the description of the present invention, a BS will be called an eNB.
[051] In the present invention, a node refers to a fixed point capable of transmitting / receiving a radio signal to / from a UE through communication with a UE. Various types of eNBs can be used as nodes regardless of their terms. For example, a BS, a B node (NB), an e-node B (eNB), a picocell eNB (PeNB), an initial eNB (HeNB), a relay, a repeater, etc. they can be a knot. In addition, the node may not be an eNB. For example, the node may be a remote radio head (RRH) or a remote radio unit (RRU). The RRH or RRU generally has a lower power level than a power level of an eNB. Since RRH or RRU (hereinafter RRH / RRU) is usually connected to eNB via a dedicated line, such as an optical cable, cooperative communication between RRH / RRU and eNB can be smoothly performed compared to communication cooperative between eNBs connected by a radio line. At least one antenna is installed per node. The antenna can mean a physical antenna or mean an antenna port or a virtual antenna.
[052] In the present invention, a cell refers to a prescribed geographical area in which one or more nodes provide a communication service. Consequently, in the present invention, communication with a specific cell can mean communication with an eNB or a node that provides a communication service for the specific cell. In addition, a DL / UL signal from a specific cell refers to a DL / UL signal from / to an eNB or a node that provides a communication service for the specific cell. A node that provides UL / DL communication services to a UE is called a server node and a cell in which UL / DL communication services are provided by the server node is especially called a server cell.
[053] However, an LTE / LTE-A 3GPP system uses a cell concept to manage radio resources and a cell associated with radio resources is distinguished from a cell in a geographic region.
[054] A "cell" of a geographical region can be understood as the coverage within which a node can provide service using a carrier and a "cell" of a radio resource is associated with bandwidth (BW) which is a frequency range configured by the carrier. Since the DL coverage, which is a range within which the node is able to transmit a valid signal, and UL coverage, which is a range within which the node is capable of receiving a valid signal from the UE, depends on a carrier carrying the signal, the node coverage can be associated with the "cell" coverage of a radio resource used by the node. Consequently, the term "cell" can be used to indicate service coverage of the nodes, sometimes a radio resource, other times, or a band that a signal using a radio resource can reach with valid intensity, other times.
[055] However, the LTE-A 3GPP standard uses the concept of a cell to manage radio resources. The "cell" associated with radio resources is defined by the combination of downlink resources and uplink resources, that is, combination of component carrier DL (CC) and CC UL. The cell can be configured only by downlink resources, or it can be configured by downlink resources and uplink resources. If carrier aggregation is supported, the link between a downlink resource carrier frequency (or CC DL) and an uplink resource carrier frequency (or UL CC) can be indicated by the system information. For example, the combination of DL resources and UL resources can be indicated by linking the type 2 system information block (SIB2). In this case, the carrier frequency means a central frequency for each cell or DC. A cell that operates on a primary frequency can be called a primary cell (Pcell) or PCC, and a cell that operates on a secondary frequency can be called a secondary cell (Scell) or SCC. The carrier that corresponds to Pcell on the downlink will be called a primary downlink DC (PCC DL), and the carrier that corresponds to Pcell on the uplink link will be called a primary uplink DC (PCC UL). A Scell means a cell that can be configured after completing the establishment of a radio resource control (RRC) connection and used to provide additional radio resources. Scell can form a set of server cells for the UE together with Pcell, according to the capabilities of the UE. The carrier that corresponds to Scell on the downlink will be called a secondary downlink DC (SCC DL), and the carrier that corresponds to Scell on the downlink will be called a secondary uplink CC (SCC UL). Although the UE is in the RRC-CONNECTED state, if it is not configured by carrier aggregation or does not support carrier aggregation, there is only a single server cell configured by Pcell.
[056] For terms and technologies that are not specifically described among the terms and technologies used in this specification, the LTE / LTE-A 3GPP standard documents, for example, TS 3GPP 36.211, TS 3GPP 36.212, TS 3GPP 36.213, TS 3GPP 36.321, TS 3GPP 36.322, TS 3GPP 36.300, TS 3GPP 36.323 and TS 3GPP 36.331 can be cited.
[057] Figure 2 is a block diagram that illustrates the network structure of an evolved universal mobile telecommunication system (E-UMTS). E-UMTS can also be called an LTE system. The communication network is widely installed to provide a variety of communication services, such as voice (VoIP) over IMS and packet data.
[058] As shown in Figure 2, the E-UMTS network includes an evolved UMTS terrestrial radio access network (E-UTRAN), an Evolved Packet Core (EPC) and one or more user devices. The E-UTRAN can include one or more evolved NodeBs (eNodeB) 20, and a plurality of user equipment (UE) 10 can be located in a cell. One or more E-UTRAN mobility management entity (MME) / system architecture evolution (SAE) 30 communication ports can be positioned at the end of the network and connected to an external network.
[059] As used in this document, "downlink" refers to communication from eNB 20 to UE 10, and "uplink" refers to communication from UE to an eNB.
[060] Figure 3 is a block diagram showing the architecture of a typical E-UTRAN and a typical EPC.
[061] As shown in Figure 3, an eNB 20 provides endpoints for a user plane and a control plane for UE 10. The MME / SAE 30 gateway provides a function endpoint. session management and mobility for UE 10. The eNB and the MME / SAE communication port can be connected via an S1 interface.
[062] The eNB 20 is generally a fixed station that communicates with a UE 10, and can also be called a base station (BS) or an access point. One eNB 20 can be installed per cell. An Interface to transmit user traffic and control traffic can be used between eNBs 20.
[063] MME provides several functions including NAS signaling for eNBs 20, NAS signaling security, AS security control, inter CN node signaling for mobility between 3GPP access networks, UE accessibility in idle mode (including control and execution relay paging), tracking area list management (for UE in idle and active mode), P-GW and S-GW selection, MME selection for MME change handovers, GPRS server support node selection (SGSN) for handovers for 3GPP 2G or 3G access networks, roaming, authentication, bearer management functions that include dedicated bearer establishment, support for PWS message transmission (which includes ETWS and CMAS). The SAE communication port provides assorted functions including user-based packet filtering (for example, by deep packet inspection), legal interception, UE Internet Protocol (IP) address allocation, packet level marking. downlink transport, UL and DL service level loading, gating and fee enforcement, DL fee enforcement based on APN-AMBR. For the sake of clarity, the MME / SAE 30 communication port will be referred to in this document simply as a “communication port”, however, it is understood that this entity includes both an MME and an SAE communication port.
[064] A plurality of nodes can be connected between eNB 20 and communication port 30 via interface S1. The eNBs 20 can be connected to each other via an X2 interface and neighboring eNBs can have an interlaced network structure that has the X2 interface.
[065] As illustrated, the eNB 20 can perform selection functions for communication port 30, routing towards communication port 30 during a radio resource control (RRC) activation, programming and transmission of paging messages, programming and transmission of broadcast channel information (BCH), dynamic resource allocation in UEs 10 on both uplink and downlink, configuration and provisioning of eNB measurements, radio bearer control, radio admission control (RAC) and control of connection mobility in LTE_ACTIVE state. In EPC, and as noted above, communication port 30 can perform paging source functions, LTE_IDLE state management, user plan encryption, system architecture evolution bearer control (SAE) and encryption and integrity protection non-access layer (NAS) signaling.
[066] The EPC includes a mobility management entity (MME), a server communication port (S-GW) and a packet data network communication port (PDN-GW). MME has information about UE connections and capabilities, primarily for use in managing and mobility of UEs. S-GW is a communication port that has E-UTRAN as an end point, and PDN-GW is a communication port that has a packet data network (PDN) as an end point.
[067] Figure 4 is a diagram showing a control plan and a user plan for a radio interface protocol between a UE and an E-UTRAN based on a 3GPP radio access network standard. The control plan refers to a trajectory used to transmit control messages used to manage a call between the UE and the E-UTRAN. The user plan refers to a trajectory used to transmit data generated at an application layer, for example, voice data or Internet packet data.
[068] A physical layer (PHY) of a first layer (ie layer L1) provides a service for transferring information to a higher layer using a physical channel. The PHY layer is connected to a medium access control (MAC) layer located on the top layer through the transport channel. The data is transported between the MAC layer and the PHY layer through the transport channel. The data is transported between a physical layer on the transmission side and a physical layer on the receiving side through the physical channels. Physical channels use time and frequency as radio resources. In detail, the physical channel is modulated using an orthogonal frequency division multiple access scheme (OFDMA) on a downlink and is modulated using a single carrier frequency division multiple access scheme (SC- FDMA) in an ascending link.
[069] The MAC layer of a second layer (ie L2 layer) provides a service for a radio link control layer (RLC) of an upper layer through a logical channel. The second layer RLC layer supports reliable data transmission. An RLC layer function can be implemented by a MAC layer functional block. A second layer packet data convergence protocol (PDCP) layer performs a header compression function to reduce unnecessary control information for efficient transmission of an Internet protocol (IP) packet, such as an IP version 4 packet. (IPv4) or an IP version 6 (IPv6) packet on a radio interface that has a relatively small bandwidth.
[070] A radio resource control layer (RRC) located at the bottom of a third layer is defined only in the control plane. The RRC layer controls logical channels, transport channels and physical channels in relation to the configuration, reconfiguration and release of radio bearers (RBs). A RB refers to a service that the second layer provides for data transmission between the UE and the E-UTRAN. To this end, the RRC layer of the UE and the RRC layer of the E-UTRAN exchange RRC messages with each other.
[071] Radio bearers are roughly classified into data radio (user) carriers (DRBs) and signaling radio carriers (SRBs). SRBs are defined as radio bearers (RBs) that are used only for the transmission of RRC and NAS messages.
[072] An eNB cell is defined to operate in one of the bandwidths, such as 1.25, 2.5, 5, 10, 15 and 20 MHz and provides a downlink or uplink transmission service for one plurality of UEs in the bandwidth. Different cells can be defined to provide different bandwidth.
[073] Downlink transport channels for transmitting data from the E-UTRAN to the UE include a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting data messages. paging and a downlink shared channel (SCH) for transmitting traffic messages or user control. Traffic or control messages from a downlink multicast or point-to-point broadcast service can be transmitted via the downlink SCH and can also be transmitted via a separate link multicast channel (MCH).
[074] The uplink transport channels for transmitting data from the UE to the E-UTRAN include a random access channel (RACH) for transmitting initial control messages and an uplink SCH for transmitting data messages. traffic or user control. Logical channels that are transport channels defined above and mapped to transport channels include a diffusion control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a control channel multicast (MCCH) and a multicast traffic channel (MTCH).
[075] Figure 5 is a view showing an example of a physical channel structure used in an E-UMTS system. A physical channel includes several subframes on a geometric time axis and several subcarriers on a geometric frequency axis. Here, a subframe includes a plurality of symbols on the geometric time axis. A subframe includes a plurality of resource blocks and a resource block includes a plurality of symbols and a plurality of subcarriers. In addition, each subframe can use certain subcarriers of certain symbols (for example, a first symbol) from a subframe to a physical downlink control channel (PDCCH), that is, an L1 / L2 control channel. The PDCCH carries programming assignments and other control information. In Figure 5, an L1 / L2 control information transmission area (PDCCH) and a data area (PDSCH) are shown. In one embodiment, a 10 ms radio frame is used and a radio frame includes 10 subframes. In addition, a subframe includes two consecutive partitions. The length of a partition can be 0.5 ms. In addition, a subframe includes a plurality of OFDM symbols and a portion (e.g., a first symbol) of the plurality of OFDM symbols can be used to transmit the L1 / L2 control information.
[076] Figure 6 schematically illustrates three duplex schemes used in two-way radio communication.
[077] A radio frame may have different configurations according to duplex modes. Duplex refers to the bidirectional communication between two devices, distinguished from the simplex that indicates unidirectional communication. In bidirectional communication, transmission over bidirectional links can occur at the same time (full-duplex) or at separate times (half-duplex). In FDD mode, for example, since the DL transmission and the UL transmission are broken down according to frequency, a radio frame for a specific frequency band that operates on a carrier frequency includes DL sub-frames or UL sub-frames. Referring to Figure 6 (a), a full-duplex transceiver is used to separate two communication links from opposite directions in the frequency domain. That is, different carrier frequencies are adopted in the respective link directions. Duplex that uses different carrier frequencies in the respective link directions is called frequency division duplex (FDD). In TDD mode, since DL transmission and UL transmission are broken down according to time, a radio frame for a specific frequency band that operates on a carrier frequency includes both DL and UL subframes. With reference to Figure 6 (c), a duplex that uses the same carrier frequency in the respective link directions is called a time division duplex (TDD). Referring to Figure 6 (b), the half-duplex transceiver can use different carrier frequencies in the respective link directions and this is called a half-duplex FDD (HD-FDD). In HD-FDD, the communication of opposite directions for a specific device occurs not only at different carrier frequencies, but also at different timings. Therefore, HD-FDD is considered as a hybrid of FDD and TDD.
[078] A time interval in which a subframe is transmitted is defined as a transmission time interval (TTI). Time resources can be distinguished by a radio frame number (or radio frame index), subframe number (or subframe index), a partition number (or partition index) and the like. TTI refers to an interval during which data can be programmed. For example, in the current LTE / LTE-A system, an opportunity to transmit a UL concession or a DL concession is present every 1 ms, and the UL / DL concession opportunity does not exist several times in less than 1 ms. Therefore, the TTI in the current LTE / LTE-A system is 1 ms.
[079] A base station and UE transmit / receive data mainly via a PDSCH, which is a physical channel, using a DL-SCH which is a transmission channel, except for a certain control signal or certain data of service. The information that indicates to which UE (one or a plurality of UEs) the PDSCH data is transmitted and how the UE receives and decodes PDSCH data is transmitted in a state that is included in the PDCCH.
[080] For example, in a modality, a given PDCCH is masked with CRC with a temporary radio network identity (RNTI) "A" and information about data is transmitted using a radio resource "B" (for example) example, a frequency location) and "C" transmission format information (for example, a transmission block size, modulation, encoding information or the like) across a given subframe. Then, one or more UEs located in a cell monitor the PDCCH using their RNTI information. And, a specific UE with RNTI "A" reads the PDCCH and then receives the PDSCH indicated by B and C in the PDCCH information.
[081] Figure 7 is a diagram for an overview medium access control (MAC) structure on one EU side.
[082] The MAC layer supports the following functions: mapping between logical channels and transport channels; multiplexing of MAC SDUs from one or different logical channels over transport blocks (TB) to be delivered to the physical layer in transport channels; demultiplexing of MAC SDUs from one or different logical channels from transport blocks (TB) delivered from the physical layer in transport channels; schedule information report (for example, schedule request, temporary storage status report); error correction through HARQ; priority manipulation between UEs through dynamic programming; priority handling between logical channels of a MAC entity; Prioritization of Logical Channel (LCP); selection of transport format; and radio resource selection for side link (SL).
[083] There is one HARQ entity in the MAC entity for each server cell that maintains a number of parallel HARQ processes. Each HARQ process is associated with an HARQ process identifier. The HARQ entity directs HARQ information and associated transport blocks (TBs) received at the DL-SCH to the corresponding HARQ processes. In the legacy LTE / LTE-A system, there are a maximum of 8 HARQ DL processes per FDD server cell. In asynchronous HARQ operation, an HARQ process is associated with the TTI based on the UL grant received. Each asynchronous HARQ process is associated with an HARQ process identifier. HARQ feedback is not applicable for asynchronous UL HARQ. In the legacy LTE / LTE-A system, there are a maximum of 8 or 16 HARQ DL processes per FDD server cell.
[084] Figure 8 is a diagram showing a concept of discontinuous reception (XRD).
[085] In the LTE / LTE-A system, XRD is performed by an UE to reduce its energy consumption due to continuous monitoring of PDCCH, where monitoring implies trying to decode each of the PDCCHs into a set of PDCCH candidates . Without DRX, the UE must be activated at all times in order to decode downlink data, as the data on the downlink can arrive at any time. This has a serious impact on the EU's energy consumption. The MAC entity can be configured by RRC with a DRX functionality that controls the UE's PDCCH monitoring activity. When in RRC_CONNECTED, if DRX is configured, the MAC entity is allowed to monitor the PDCCH discontinuously with the use of the DRX operation; otherwise, the MAC entity monitors the PDCCH continuously. With reference to Figure 8, if DRX is configured for a UR in the RRC_CONNECTED state, the UE tries to receive a downlink channel, PDCCH, that is, it performs PDCCH monitoring only during a predetermined period of time, while the UE does not perform monitoring PDCCH during the remaining time periods. A period of time during which the UE must monitor a PDCCH is called "On Duration". An On Duration is defined per DRX cycle. That is, a DRX cycle specifies the periodic repetition of On Durations followed by a possible period of inactivity as shown in Figure 8.
[086] The UE always monitors a PDCCH during On Duration in a DRX cycle and a DRX cycle determines a period in which an On Duration is defined. DRX cycles are classified into a long DRX cycle and a short DRX cycle according to the periods of the DRX cycles. The long DRX cycle can minimize a UE's battery consumption, while a short DRX cycle can minimize a data transmission delay.
[087] When the UE receives a PDCCH during On Duration in a DRX cycle, an additional transmission or retransmission may occur for a period of time other than On Duration. Therefore, the UE must monitor a PDCCH for a period of time other than On Duration. That is, the UE must perform PDCCH monitoring for a period of time through which an inactivity management timer, drx-InactivityTimer or a retransmission management timer, drx-RetransmissionTimer as well as an On Duration management timer, onDurationTimer are running.
[088] RRC controls the DRX operation by setting the timers onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimer (one per HARQ DL process except for the diffusion process), drx-ULRetransmissionTimer (one per HARQ UL asynchronous process), longDRX- Cycle, the value of drxStartOffset and optionally drxShortCycleTimer and shortDRX-Cycle. An eNB endows a UE with DRX configuration information that includes these parameters via an RRC signal. The UE receives DRX configuration information. An RTT HARQ DL timer per HARQ DL process (except for the broadcast process) and the RTT HARQ timer UL per asynchronous UL HARQ process is also defined.onDurationTimer specifies the number of consecutive PDCCH-subframe (s) at the beginning of a DRX Cycle. drx-InactivityTimer specifies the number of consecutive PDCCH- subframe (s) after the subframe in which a PDCCH indicates an initial UL, DL or SL user data transmission for that MAC entity. drx- RetransmissionTimer specifies the maximum number of consecutive PDCCH-subframe (s) until a DL retransmission is received. drx- ULRetransmissionTimer specifies the maximum number of consecutive PDCCH-subframe (s) until a lease for UL relay is received. drxStartOffset specifies the subframe where the DRX Cycle starts. drxShortCycleTimer specifies the number of consecutive subframes that the MAC entity must follow the short DRX cycle. An RTT HARQ DL timer specifies the minimum amount of subframe (s) before a HARQ DL retransmission is expected by the MAC entity. The RTT HARQ UL timer specifies the minimum amount of subframe (s) before a HARQ UL relay lease is expected by the MAC entity.
[089] The value of each timer is defined as the number of subframes. The number of subframes is counted until the value of a timer is reached. If the timer value is satisfied, the timer expires. A timer is running once it is started, until it is interrupted or until it expires; otherwise, it is not running. A timer can be started if it is not running or restarted if it is running. A timer is always started or restarted from its initial value.
[090] Additionally, the UE must perform PDCCH monitoring during random access or when the UE transmits a schedule request and attempts to receive a UL grant.
[091] A period of time during which a UE must perform PDCCH monitoring is called an Active Time. Active Time includes On Duration during which a PDCCH is periodically monitored and an interval of time during which a PDCCH is monitored by generating an event.
[092] Recently, machine-type communication (MTC) has surfaced as a significant standard communication problem. TCM refers to the exchange of information between a machine and an eNB without involving people or with minimal human intervention. For example, MTC can be used for data communication for measurement / detection / reporting, such as meter reading, water level measurements, use of a security camera, inventory report from a vending machine, etc. and can also be used for automatic application or firmware update processes for a plurality of UEs. In the MTC, the amount of transmission data is small and the transmission or reception of UL / DL data (hereinafter, transmission / reception) occurs occasionally. In consideration of such MTC properties, it may be better in terms of efficiency to reduce the production cost and battery consumption of the UEs to MTC (hereinafter, MTC UEs) according to the data transmission rate. A low complexity low bandwidth (BL) UE or an advanced coverage UE may correspond to a UE MTC.
[093] Many of the devices are expected to be connected to the internet of things (IoT). IoT is the interconnection of physical devices, vehicles (also called "connected devices" and "smart devices"), buildings, and other items embedded in electronics, software, sensors, actuators and network connectivity that allows these objects to be collected and exchange data. In other words, IoT refers to a network of physical objects, machines, people and other devices that allow connectivity and communication to exchange data for smart applications and services. The IoT allows objects to be detected and controlled remotely through existing network infrastructures, providing opportunities for integration between the physical and digital worlds, resulting in improved efficiency, accuracy and economic benefits. In particular, in the present invention, the IoT that uses 3GPP technology is called cellular IoT (CIoT). The CIoT that transmits / receives the IoT signal using a narrow band (for example, a frequency band of about 200 kHz) is called an NB-IoT. CIoT can be used to monitor traffic transmitted over relatively long periods, for example, from a few decades to a year (for example, smoke alarm detection, smart meter power failure notification, tamper notification, reports measurement of intelligent utility (gas / water / electricity), patches / software updates, etc.) and ultra-low complexity, 'IoT' devices with limited power and low data rate. CIoT is a technology to solve the problem that a conventional attachment procedure or a service request procedure causes a UE to waste energy due to a large number of message exchanges. CIoT minimizes the energy consumption of the UE through the plan C solution in which the MME processes the data or through a plan U solution in which the UE and eNB maintain the context even if the UE is in a similar state to the RRC idle state and uses the context for the next connection. As the name implies, the narrowband internet of things (NB-IoT) is a wireless technology that provides IoT service using a narrowband frequency of around 200 kHz. The NB-IoT uses a very small frequency compared to conventional LTE technology with the use of a frequency band of at least 1.25 MHz. Therefore, the NB-IoT minimizes processing energy and minimizes energy consumption in the EU side. The CIoT network or technology primarily provides the communication service optimized for the UE IoT in terms of the core network, and the NB-IoT network or technology optimizes the radio interface of the existing LTE technology for IoT. Therefore, NB-IoT radio technology and CIoT technology can be applied separately. That is, even if the NB-IoT radio technology is not used, it is possible to apply CIoT technology through the conventional LTE radio network. This means that CIoT technology can be applied to UEs that cannot use NB-IoT radio technology, for example, UEs already released with LTE radio technology only. In addition, this means that cells based on LTE radio technology can support conventional LTE UEs, such as smart phones while simultaneously supporting IoT UEs.
[094] The downlink transmission scheme for NB-IoT is similar to that of the general UE LTE / LTE-A / NR, with the differences that in the frequency domain, there is only one resource block for an NB-IoT carrier , OFDM subcarrier spacing △ f = 15 kHz always, and only half-duplex operation from the point of view of UE NB-IoT is supported. An NB-IoT UE can be configured with more than one NB-IoT carrier.
[095] The PDCCH which port DCI for NB-IoT is called "NPDCCH", PDSCH which port downlink data for NB-IoT is called "NPDSCH", and PUSCH which port uplink data for NB-IoT is called "NPUSCH".
[096] A fully mobile and connected society is expected in the near future, which will be characterized by an enormous amount of growth in connectivity, traffic volume and a much wider range of usage scenarios. Typical trends include explosive growth in data traffic, large increases in connected devices, and the continued emergence of new services. In addition to market requirements, the mobile communications society itself also requires sustainable ecosystem development, which produces the needs to further improve system efficiencies, such as spectrum efficiency, energy efficiency, operational efficiency and cost efficiency. In order to meet the increasingly growing requirements of the market and the mobile communication society, next generation access technologies are expected to emerge in the near future.
[097] Work started on ITU and 3GPP to develop requirements and specifications for new radio systems, as in Recommendation ITU-R M.2083 "Framework and overall objectives of the future development of IMT for 2020 and beyond", as well as the study item 3GPP SA1 New Services and Markets Technology Enablers (SMARTER) and study item SA2 Architecture for the new RAT (NR) System (also called new RAT 5G). It is necessary to identify and develop the technology components necessary to successfully standardize the NR system that meets both the urgent market needs and the longer term requirements established by the ITU-R IMT-2020 process in a timely manner. In order to achieve this, the evolution of the radio interface as well as the radio network architecture needs to be considered in the “New Radio Access Technology”.
[098] In legacy LTE / LTE-A, the transmission time interval (TTI) is used in the MAC layer as a basic time unit that the MAC delivers a MAC PDU for PHY, which is fixed at 1 ms. In other words, the HARQ entity delivers a MAC PDU to PHY once per TTI. Multiple numerologies, that is, multiple subcarrier spacing, such as 30 kHz, 60 kHz, etc., are being studied for new radio access technology, multiple time units such as partition and minipartition are being discussed in multiple spacing of subcarrier, where minipartition is the smallest possible programming unit and smaller than a partition or subframe. Although the partition concept already occurs in the legacy LTE / LTE-A, it is fixed at 0.5 ms which corresponds to 7 OFDM symbols and is transparent for MAC layer operation. In NR, however, the partition or minipartition may have different lengths of time depending on the subcarrier spacing. For example, a partition duration can be 0.5 ms for 30 kHz subcarrier spacing, while a partition duration can be 0.25 ms for 50 kHz subcarrier spacing. In addition, the MAC layer is required to operate based on the partition and / or minipartition, that is, the HARQ entity delivers a MAC PDU to PHY once per partition or minipartition. Considering that it depends on the network decision whether to program in the subframe, partition or minipartition unit, or that the subcarrier spacing must be used, the time unit used for MAC layer operation can change dynamically. Although the present invention is described with reference to TTI of 1 ms and a TTI length shorter than 1 ms, the present invention can also be applied to a TTI duration longer than 1 ms in the same or similar manner to the following description. A short TTI with 7 OFDM symbols and 2 OFDM symbols is introduced as a partition and a mini-partition, respectively, and a short TTI with 1 OFDM symbol is e, discussion for a mini-partition. Consequently, in the NR system, MAC needs to operate based on multiple TTIs. The time unit mentioned as a subframe in the above or later description of the present invention can be a partition, minipartition, symbol (s), millisecond (s) or second (s).
[099] Figure 9 is a diagram showing a method for a DRX operation in the current LTE / LTE-A system.
[0100] When a DRX cycle is configured, the Active Time includes the time while:
[0101] onDurationTimer or drx-InactivityTimer or drx-RetransmissionTimer or drx-ULRetransmissionTimer or mac-ContentionResolutionTimer is running; or
[0102] a Programming Request is sent at PUCCH and is pending; or
[0103] an uplink lease for a pending HARQ retransmission may occur and there is data in the corresponding HARQ buffer for the synchronous HARQ process; or
[0104] a PDCCH indicating a new transmission addressed to the MAC entity's C-RNTI was not received after the successful reception of a Random Access Response for the preamble not selected by the MAC entity.
[0105] When DRX is configured, for each subframe, the MAC entity must:
[0106] if an RTT HARQ DL timer expires in this subframe:
[0107] if the data of the corresponding HARQ process has not been successfully decoded:
[0108] start drx-RetransmissionTimer for the corresponding HARQ process.
[0109] if NB-IoT, start or restart the drx-InactivityTimer.
[0110] if an RTT HARQ UL timer expires in this subframe:
[0111] start the drx-ULRetransmissionTimer for the corresponding HARQ process.
[0112] if NB-IoT, start or restart the drx-InactivityTime.
[0113] if a DRX Command MAC control element or a Long DRX Command MAC control element is received:
[0114] interrupt onDurationTimer;
[0115] interrupt drx-InactivityTimer.
[0116] if drx-InactivityTimer expires or a DRX Command MAC control element is received in this subframe:
[0117] if the Short DRX cycle is configured:
[0118] start or restart drxShortCycleTimer;
[0119] use the Short DRX Cycle.
[0120] otherwise:
[0121] use the Long DRX cycle.
[0122] if drxShortCycleTimer expires in this subframe:
[0123] use the Long DRX cycle.
[0124] if a Long DRX Command MAC control element is received:
[0125] interrupt drxShortCycleTimer;
[0126] use the Long DRX cycle.
[0127] If the Short DRX Cycle is used and the module {(SFN * 10) + subframe number} (shortDRX-Cycle) = module (drxStartOffset) (shortDRX-Cycle); or
[0128] if the Long DRX Cycle is used and the module {(SFN * 10) + subframe number} (longDRX-Cycle) = drxStartOffset:
[0129] if NB-IoT:
[0130] If there is at least one HARQ process for which neither the RTT HARQ Timer nor the RTT HARQ UL Timer is running, start onDurationTimer.
[0131] otherwise:
[0132] start onDurationTimer.
[0133] during Active Time, for a PDCC subframe, if the subframe is not required for uplink transmission for UE FDD half-duplex operation, and if the subframe is not a half-duplex guard subframe (see TS 36.211 3GPP ) and if the subframe is not part of a configured measurement interval and if the subframe is not part of a Side Link Discovery Interval configured for Reception, and for NB-IoT if the subframe is not required for uplink transmission or downlink reception other than PDCCH; or
[0134] during Active Time, for a subframe other than a PDCCH subframe and for a UE capable of receiving and transmitting simultaneously in the aggregated cells, if the subframe is a downlink subframe indicated by an eIMTA L1 signaling valid for at least one cell server not configured with schedulingCellId (see 3GPP TS 36.331) and if the subframe is not part of a configured measurement interval and if the subframe is not part of a Side Link Discovery Interval configured for Reception; or
[0135] during Active Time, for a subframe other than a PDCCH subframe and for a UE not capable of simultaneous reception and transmission in the aggregated cells, if the subframe is a downlink subframe indicated by a valid eIMTA L1 signal for SpCell and if the subframe is not part of a configured measurement interval and if the subframe is not part of a Side Link Discovery Interval configured for Reception:
[0136] monitor the PDCCH;
[0137] if the PDCCH indicates a DL transmission or if a DL assignment has been configured for that subframe:
[0138] if the UE is an NB-IoT UE, a BL UE or an UE in enhanced coverage:
[0139] start the RTT HARQ Timer for the corresponding HARQ process in the subframe that contains the last repetition of the corresponding PDSCH reception;
[0140] otherwise:
[0141] start the RTT HARQ Timer for the corresponding HARQ process;
[0142] interrupt the drx-RetransmissionTimer for the corresponding HARQ process.
[0143] if NB-IoT, interrupt drx-ULRetransmissionTimer for all HARQ UL processes.
[0144] if the PDCCH indicates an UL transmission for an asynchronous HARQ process or if an UL lease has been configured for an asynchronous HARQ process for that subframe:
[0145] start the RTT HARQ UL Timer for the corresponding HARQ process in the subframe that contains the last repetition of the corresponding PDSCH transmission;
[0146] interrupt the drx-ULRetransmissionTimer for the corresponding HARQ process.
[0147] if the PDCCH indicates a new transmission (DL, UL or SL):
[0148] except for a UE NB-IoT configured with a single HARQ DL and UL process, start or restart drx-InactivityTimer.
[0149] if the PDCCH indicates a transmission (DL, UL) for an UE NB-IoT:
[0150] if UE NB-IoT is configured with a single HARQ DL and UL process:
[0151] stop drx-InactivityTimer
[0152] interrupt onDurationTimer.
[0153] The interrupt or start condition for drx-ULRetransmissionTimer is different from that for drx-RetransmssionTimer. For a UL transmission, a UE does not know until the UE receives a feedback from an eNB, and the feedback for UL transmission can be lost even if the eNB transmits the feedback. If the UE performs UL transmission, there is a possibility that the eNB feeds ACK / NACK (Negative Recognition / Recognition) for UL transmission to the UE. Consequently, a UE that performed the UL transmission starts or restarts drx-ULRetransmissionTimer when the Timer RTT HARQ UL expires. For a DL transmission, a UE knows whether the DL transmission is successful since the UE tried to decode the DL transmission, and transmits ACK or NACK based on the decoding result of the DL transmission. In the LTE / LTE-A system, if a UE transmits NACK for a DL transmission, the UE starts or restarts drx-RetransmissionTimer when the RTT HARQ Timer for the corresponding HARQ process expires. If the UE transmits ACK for a DL transmission, the UE does not initiate drx-RetransmissionTimer. In other words, for a DL transmission, an UE initiates drx-RetransmissionTimer only if the UE transmits NACK for DL transmission. Therefore, one would think that a UE that has transmitted NACK may receive a retransmission grant from an eNB in response to NACK. However, eNB may have a programming policy where a new UL transmission has a higher priority than a DL retransmission. Under the programming policy, the eNB can transmit a new transmission concession before or instead of a DL retransmission concession and, if necessary, transmit the DL retransmission concession after the transmission of the new transmission concession. In other words, a UE can receive a UL transmission grant while drx-RetransmissionTimer for DL retransmission is running.
[0154] In the description above, the PDCCH subframe refers to a PDCCH subframe. For a MAC entity not configured with any TDD server cell (s), this represents any subframe; for a MAC entity configured with at least one TDD server cell, if a MAC entity is capable of repetition and simultaneous transmission in the aggregated cells, this represents the union across all the downlink and subframes server cells that include the configuration's DwPTS TDD UL / DL indicated by the parameter tdd-Config (see 3GPP TS 36.331) provided via an RRC signal, except server cells that are configured with the schedulingCellId parameter provided via an RRC signal; otherwise, this represents the subframes in which SpCell is configured with a downlink subframe or a subframe that includes DwPTS of the TDD UL / DL configuration indicated by tdd-Config.
[0155] For NB-IoT, DL and UL transmissions will not be programmed in parallel, that is, if a DL transmission has been programmed, an UL transmission should not be programmed until the HARQ DL process RTT HARQ Timer has expired (and vice versa).
[0156] Figure 10 illustrates DRX timer operations on an UE that supports an HARQ process.
[0157] In LTE 3GPP Version 13 (hereinafter, LTE 3GPP Ver-13), an UE NB-IoT can support only one HARQ process. In LTE 3GPP Ver-13, the drx- ULRetransmissionTimer is interrupted whenever a DL or UL transmission is indicated on the PDCCH. In other words, if the UE receives the PDCCH indicated by a transmission (DL, UL), the UE interrupts drx- InactivityTimer, drx-ULRetransmissionTimer and onDurationTimer. However, in LTE 3GPP Version 13, drx-RetransmissionTimer is interrupted only when a DL transmission is indicated on the PDCCH. If the UE receives an UL grant (for example, PDCCH that indicates the new PUSCH transmission in Figure 10) after sending NACK of DL data, then drx-InactivityTimer is stopped, but the drx-RetransmissionTimer is still running. For NB-IoT, this could have the energy of the UE consumed unnecessarily (during the time period marked with in Figure 10), due to the fact that the UE as NB-IoT supports only half-duplex operation.
[0158] Recently, it is under discussion to allow an UE NB-IoT that supports 2 HARQ processes. In this case, the drx-ULRetransmissionTimer interruption condition can be modified as follows. If the UE receives the PDCCH indicated by a UL transmission, the drx-ULRetransmissionTimer is interrupted for the corresponding HARQ process. If the UE receives the PDCCH indicated by a DL transmission, the drx-ULRetransmissionTimer is interrupted for all HARQ UL processes.
[0159] However, as in UE LTE 3GPP Ver-13, the drx-RetransmissionTimer is interrupted only when a DL transmission is indicated on the PDCCH.
[0160] Figure 11 illustrates DRX timer operations in an UE that supports two HARQ processes.
[0161] In Figure 11, it is assumed that the DL transmission for two HARQ processes (HARQ # 1 and HARQ # 2) fails and that the UE receives a UL grant for HARQ No. 1 and receives a UL grant for HARQ # 2 after the corresponding RTT HARQ Timer expires. It is also assumed that the UE receives a UL grant for the first HARQ process (HARQ # 1) after the RTT HARQ Timer for the second HARQ process (HARQ # 2) expires. In this case, the drx-RetransmissionTimers are still running as the value configured by the top layer (for example, RRC layer). For NB-IoT, this could have the energy of the UE consumed unnecessarily (during the time period marked with in Figure 11), due to the fact that the UE as NB-IoT supports only half-duplex operation.
[0162] To avoid unnecessarily consuming energy from a UE, the present invention proposes that if a UE receives a PDCCH that indicates a PUSCH transmission using a HARQ UL process or if a UL concession has been configured for a process HARQ UL, UE interrupts drx- RetransmissionTimer for all HARQ DL processes, if they are running. If a PDCCH indicating a PUSCH transmission is received at a point in time (for example, subframe, partition, minipartition, symbol, millisecond or second) or if a UL lease has been configured for that point in time, the UE stops drx- RetransmissionTimer for all HARQ DL processes at that point in time. The PUSCH transmission can be a new transmission or retransmission. The HARQ process can be an asynchronous HARQ process.
[0163] In the present invention, for example, a UE can operate as follows. The UE is configured with a DRX configuration that includes drx- RetransmissionTimer. The UE monitors PDCCH while the drx-RetransmissionTimer is running. The UE receives a PDCCH that indicates a new PDSCH transmission in a HARQ DL process. The UE receives the new PDSCH transmission using the HARQ DL process indicated by the PDCCH. After receiving the new PDSCH transmission, the UE starts the RTT HARQ Timer for the HARQ DL process which is used to receive a new PDSCH transmission. The UE starts the drx-RetransmissionTimer when the RTT HARQ Timer expires. The UE monitors PDCCH ( s) while the drx-RetransimssionTimer is running. The UE stops the drx-RetransmissionTimer when the UE receives a PDCCH that indicates a PUSCH transmission. The UE does not monitor PDCCH (s) until the UE becomes Active Time due to other DRX-related timers. The drx- RetransmissionTimer specifies the maximum number of consecutive PDCCH-subframe (s) until a DL retransmission is received. The RTT HARQ Timer specifies the minimum amount of subframe (s) before a DL assignment for HARQ retransmission is expected by the MAC entity.
[0164] In the examples of the present invention, PDCCH refers to PDCCH, EPDCCH, R-PDCCH, MPDCCH or NPDCCH, PDSCH refers to PDSCH or NPDSCH and PUSCH refers to PUSCH or NPUSCH.
[0165] Although the present invention is described for UEs that support only one or two HARQ processes, the present invention can also be applied to UEs that support more than two HARQ processes if the UEs support only half-duplex mode.
[0166] Figure 12 illustrates DRX timer operations in a UE that supports an HARQ process according to the present invention. The UE that supports an HARQ process can be an NB-IoT UE.
[0167] With reference to Figure 12, drx-RetransmissionTimer in an UE that supports only one HARQ process can be stopped via a procedure as follows.
[0168] S1201. A DRX configured UE receives a PDCCH that indicates a new PDSCH transmission.
[0169] S1202. After receiving the PDCCH that indicates the new PDSCH transmission, the UE receives the new PDSCH transmission using a HARQ DL process and a programming delay indicated by the PDCCH.
[0170] S1203. After receiving the new PDSCH transmission, the UE starts an RTT HARQ Timer for the HARQ DL process in the subframe that contains the last repetition of the new PDSCH transmission.
[0171] S1204. If the new PDSCH transmission was not successfully decoded, then the UE sends NACK on a PUSCH according to the HARQ-ACK feature indicated on the PDCCH.
[0172] S1205. If the RTT HARQ Timer expires, the UE starts drx-RetransmissionTimer for the HARQ DL process, and starts drx-InactivityTimer.
[0173] S1206. If the UE receives a PDCCH that indicates a new PUSCH transmission, the UE interrupts drx-RetransmissionTimer for the HARQ DL process, and interrupts drx-InactivityTimer.
[0174] S1207. The UE sends a new PUSCH transmission according to the PDCCH which indicates the new PUSCH transmission.
[0175] An NB-IoT UE does not monitor PDCCH (s) during subframe (s) between the PDCCH and PUSCH due to the fact that the UE NB-IoT can only support half-duplex mode. Unlike conventional drx-RetransmissionTimer operations, the present invention can save more energy for half-duplex UEs in the time duration marked with I I in Figure 12.
[0176] Figure 13 illustrates DRX timer operations in a UE that supports two HARQ processes according to the present invention. The UE that supports two HARQ processes can be an UE NB-IoT.
[0177] S1301. A DRX-configured UE receives a PDCCH that indicates a new PDSCH transmission for a HARQ DL No. 1 process (HARQ No. 1). The UE initiates a drx-InactivityTimer.
[0178] S1302. The UE receives a PDCCH that indicates a new PDSCH transmission for a HARQ DL process No. 2 (HARQ No. 2) when the drx- InactivityTimer is running. The UE restarts the drx-InactivityTimer.
[0179] S1303. The UE enters the DRX when the drx-InactivityTimer expires.
[0180] S1304. After receiving the PDCCH that indicates the new PDSCH transmission for HARQ DL No. 1, the UE receives the new PDSCH transmission using HARQ DL No. 1 according to a PDCCH programming delay for HARQ DL n ° 1.
[0181] S1305. After receiving the new PDSCH transmission for HARQ DL No. 1, oUE starts an RTT HARQ Timer for HARQ DL No. 1 in the subframe that contains the last repetition of the new PDSCH transmission for HARQ DL No. 1.
[0182] S1306. After receiving the PDCCH indicating the new PDSCH transmission for HARQ DL No. 2, the UE receives the new PDSCH transmission using HARQ DL No. 2 according to a PDCCH programming delay for HARQ DL n ° 2.
[0183] S1307. After receiving the new PDSCH transmission for HARQ DL No. 2, the UE starts an RTT HARQ Timer for HARQ DL No. 2 in the subframe that contains the last repetition of the new PDSCH transmission for HARQ DL No. 2.
[0184] S1308. If the new transmission from PDSCH to HARQ DL # 1 has not been successfully decoded, then the UE sends NACK on a PUSCH to HARQ DL # 1 according to the HARQ-ACK feature on the PDCCH for HARQ DL No. 1.
[0185] S1309. If the new transmission from PDSCH to HARQ DL No. 2 was not successfully decoded, then the UE sends NACK on a PUSCH to HARQ DL No. 2 according to the HARQ-ACK feature on the PDCCH for HARQ DL No. 2.
[0186] S1310. If the RTT Timer HARQ for HARQ DL # 1 expires, the UE starts a drx-RetransmissionTimer for HARQ DL # 1, and starts a drx- InactivityTimer.
[0187] S1311. If the RTT Timer HARQ for HARQ DL No. 2 expires, the UE initiates a drx-RetransmissionTimer for HARQ DL No. 2, and restarts a drx- InactivityTimer.
[0188] S1312. If the UE receives the PDCCH that indicates a new PUSCH transmission for any HARQ UL process, the UE stops the drx- RetransmissionTimers for all HARQ DL processes, and restarts the drx- InactivityTimer.
[0189] S1313. The UE enters the DRX when the drx-InactivityTimer expires.
[0190] S1314. The UE sends the new PUSCH transmission to HARQ UL No. 1 according to the PDCCH which indicates the new PUSCH transmission to HARQ UL No. 1.
[0191] S1315. The UE sends the new PUSCH transmission to HARQ UL No. 2 according to the PDCCH which indicates the new PUSCH transmission to HARQ UL No. 2.
[0192] Unlike conventional drx-RetransmissionTimer operations, the present invention can save more energy for half-duplex UEs in the time period marked with I I in Figure 13.
[0193] Figure 14 is a block diagram illustrating elements of a transmission device 100 and a receiving device 200 to implement the present invention.
[0194] The transmitting device 100 and the receiving device 200 respectively include Radio Frequency (RF) units 13 and 23 capable of transmitting and receiving radio signals carrying information, data, signals, and / or messages, memories 12 and 22 to store information related to communication in a wireless communication system, and processors 11 and 21 operationally connected to elements, such as RF units 13 and 23 and memories 12 and 22 to control the elements and configured to control memories 12 and 22 and / or RF units 13 and 23 so that a corresponding device can carry out at least one of the modalities described above of the present invention.
[0195] Memories 12 and 22 can store programs to process and control processors 11 and 21 and can temporarily store input / output information. Memories 12 and 22 can be used as temporary stores.
[0196] Processors 11 and 21 generally control the total operation of various modules in the transmitting device and the receiving device. Specifically, processors 11 and 21 can perform various control functions to implement the present invention. Processors 11 and 21 can be called controllers, microcontrollers, microprocessors or microcomputers. Processors 11 and 21 can be implemented by hardware, firmware, software or a combination of them. In a hardware configuration, application-specific integrated circuits (ASICS), digital signal processors (DSPS), digital signal processing devices (DSPDS), programmable logic devices (PLDS) or programmable door arrangements field (FPGAs) can be included in processors 11 and 21. However, if the present invention is implemented using firmware or software, the firmware or software can be configured to include modules, procedures, functions, etc. that perform the functions or operations of the present invention. Firmware or software configured to carry out the present invention can be included in processors 11 and 21 or stored in memories 12 and 22 in order to be triggered by processors 11 and 21.
[0197] Processor 11 of transmission device 100 performs predetermined modulation and encoding for a signal and / or data programmed to be transmitted out by processor 11 or a programmer connected to processor 11 and then transfers the encoded and modulated data to the RF unit 13. For example, processor 11 converts a data stream to be transmitted in K layers through demultiplexing, channel coding, scrambling and modulation. The encoded data stream is also called a code word and is equivalent to a transport block which is a data block provided by a MAC layer. A transport block (TB) is encoded in a code word and each code word is transmitted to the receiving device in the form of one or more layers. For upward frequency conversion, the RF unit 13 may include an oscillator. The RF unit 13 may include Nt (where Nt is a positive integer) transmission antennas.
[0198] A signal processing process of the receiving device 200 is the reverse of the signal processing process of the transmitting device 100. Under control of processor 21, unit 23 of the receiving device 200 receives radio signals transmitted by the transmitting device 100. RF unit 23 may include Nr (where Nr is a positive integer) receiving antennas and downwardly converting the frequency of each signal received through the receiving antennas into a baseband signal. Processor 21 decodes and demodulates radio signals via the receiving antennas and restores the data that the transmitting device 100 intends to transmit.
[0199] RF units 13 and 23 include one or more antennas. An antenna performs a function to transmit signals processed by RF units 13 and 23 to the outside or receive radio signals from the outside to transfer the radio signals to RF units 13 and 23. The antenna can also be called a port antenna. Each antenna can correspond to a physical antenna or can be configured by combining more than one physical antenna element. The signal transmitted from each antenna cannot be further deconstructed by the receiving device 200. An RS transmitted through a corresponding antenna defines an antenna from the point of view of the receiving device 200 and allows the receiving device 200 to derive channel estimation for the antenna, regardless of whether the channel represents a single radio channel from a physical antenna or a composite channel from a plurality of physical antenna elements including the antenna. That is, an antenna is defined so that a channel that carries an antenna symbol can be obtained from a channel that carries another symbol of the same antenna. An RF unit that supports a MIMO function to transmit and receive data using a plurality of antennas can be connected to two or more antennas.
[0200] In the embodiments of the present invention, a terminal or UE operates as the transmission device 100 in UL, and as the receiving device 200 in DL. In the embodiments of the present invention, an eNB operates as the receiving device 200 in UL and as the transmitting device 100 in DL. Hereinafter, a processor, an RF unit and a memory included in the UE will be called an UE processor, an EU RF unit and an EU memory, respectively, and a processor, an RF unit and a memory included in the eNB will be called a processor eNB, an RF eNB unit and an eNB memory, respectively.
[0201] The UE processor initiates a downlink (DL) discontinuous reception (DRX) retransmission timer for a UE hybrid DL request and automatic retry process. The UE processor monitors a physical downlink control (PDCCH) channel while the DRX DL retransmission timer for the HARQ DL process is running. The UE processor stops the DRX DL retransmission timer for the HARQ DL process when the UE RF unit receives a PDCCH that indicates an uplink (UL) transmission. If multiple DRX DL relay timers are running for multiple HARQ DL processes, the UE processor stops all DRX DL relay timers for multiple HARQ DL processes when the RF RF unit receives the PDCCH indicating UL transmission. The UE processor interrupts the DRX DL retransmission timer for the HARQ DL process when an UL lease is configured for a HARQ UL process. The UE may be a UE that operates in halfduplex. The UE may be a narrowband internet of things (NB-IoT) UE. The UE processor stops the DRX DL retransmission for the HARQ DL process even when the UE does not receive a PDCCH that indicates a DL transmission for the HARQ DL process. The UE processor controls the UE RF unit to receive DRX configuration information that includes a value for the DRX DL retransmission timer. The UE processor controls the EU RF unit to transmit the UL transmission.
[0202] As described above, a detailed description of the preferred embodiments of the present invention has been provided to allow those skilled in the art to implement and practice the invention. Although the invention has been described with reference to exemplary embodiments, those skilled in the art will note that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention described in the appended claims. Consequently, the invention should not be limited to the specific modalities described in this document, but must be in accordance with the broader scope consistent with the innovative principles and resources disclosed in this document. INDUSTRIAL APPLICABILITY
[0203] The modalities of the present invention are applicable to a network node (for example, BS), a UE or other devices in a wireless communication system.

权利要求:
Claims (14)
[0001]
1. Method for receiving, via user equipment (UE), downlink signals in a wireless communication system, the method CHARACTERIZED by the fact that it comprises: starting, through the UE, a retransmission timer of discontinuous downlink (DL) reception (DL) for a UE hybrid DL automatic request and repeat process; monitor, through the UE, a physical downlink control channel (PDCCH) while the DRX DL retransmission timer for the HARQ DL process is running; and interrupt, via the UE, the DRX DL retransmission timer for the HARQ DL process when the UE receives a PDCCH indicating an uplink (UL) transmission, in which, if there are multiple DRX DL relay timers running for multiple HARQ DL processes, all of the multiple DRX DL retransmission timers running for the multiple HARQ DL processes are interrupted when the UE receives the PDCCH indicating UL transmission.
[0002]
2. Method according to claim 1, CHARACTERIZED by the fact that the DRX DL retransmission timer for the HARQ DL process is interrupted in one time unit when there is a UL lease configured in a time unit for a HARQ UL process .
[0003]
3. Method, according to claim 1, CHARACTERIZED by the fact that the UE is a UE that operates in half-duplex.
[0004]
4. Method, according to claim 1, CHARACTERIZED by the fact that the UE is a narrowband internet of things (NB-IoT) UE.
[0005]
5. Method according to claim 1, CHARACTERIZED by the fact that the DRX DL retransmission timer for the HARQ DL process is interrupted when the UE receives the PDCCH that indicates the UL transmission, even when the UE does not receive a PDCCH that indicates a DL transmission for the HARQ DL process.
[0006]
6. Method according to claim 1, CHARACTERIZED by the fact that it additionally comprises: receiving, through the UE, DRX configuration information that includes a value for the DRX DL retransmission timer.
[0007]
7. Method, according to claim 1, CHARACTERIZED by the fact that it additionally comprises: performing, through the UE, the UL transmission.
[0008]
8.User equipment (UE) to receive downlink signals in a wireless communication system, CHARACTERIZED by the fact that it comprises: a transceiver; and a processor configured to: initiate a downlink (DL) discontinuous reception (DRX) retransmission timer for a DL hybrid automatic request and repeat process from the UE; monitor a physical downlink control channel (PDCCH) while the DRX DL retransmission timer for the HARQ DL process is running; and interrupt the DRX DL retransmission timer for the HARQ DL process when the UE receives a PDCCH indicating an uplink (UL) transmission, where, if there are multiple DRX DL relay timers running for multiple HARQ DL processes, the processor is configured to interrupt all of the multiple DRX DL retransmission timers running for the multiple HARQ DL processes when the UE receives the PDCCH indicating UL transmission.
[0009]
9.User equipment (UE), according to claim 8, CHARACTERIZED by the fact that the processor is configured to interrupt the DRX DL retransmission timer for the HARQ DL process in a unit of time when there is a UL concession configured in the unit of time for a HARQ UL process.
[0010]
10.User equipment (UE), according to claim 8, CHARACTERIZED by the fact that the UE is a UE that operates in half-duplex.
[0011]
11.User equipment (UE), according to claim 8, CHARACTERIZED by the fact that the UE is a narrowband internet of things (NB-IoT) UE.
[0012]
12.User equipment (UE) according to claim 8, CHARACTERIZED by the fact that the processor is configured to interrupt the DRX DL retransmission timer for the HARQ DL process when the UE receives a PDCCH indicating an UL transmission, even when the UE does not receive a PDCCH that indicates a DL transmission for the HARQ DL process.
[0013]
13.User equipment (UE) according to claim 8, CHARACTERIZED by the fact that the processor is configured to control the transceiver to receive DRX configuration information that includes a value for the DRX DL retransmission timer.
[0014]
14.User equipment (UE), according to claim 8, CHARACTERIZED by the fact that the processor is configured to control the transceiver to transmit the UL transmission.

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法律状态:
2020-09-15| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2020-12-08| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 13/03/2018, OBSERVADAS AS CONDICOES LEGAIS. |

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