WO2015076639A1 - 단말이 기지국에게 보고하는 방법 및 이를 위한 장치 - Google Patents
단말이 기지국에게 보고하는 방법 및 이를 위한 장치 Download PDFInfo
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- WO2015076639A1 WO2015076639A1 PCT/KR2014/011361 KR2014011361W WO2015076639A1 WO 2015076639 A1 WO2015076639 A1 WO 2015076639A1 KR 2014011361 W KR2014011361 W KR 2014011361W WO 2015076639 A1 WO2015076639 A1 WO 2015076639A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0096—Indication of changes in allocation
- H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1874—Buffer management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/18—Management of setup rejection or failure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1896—ARQ related signaling
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method for a terminal to report to a base station and an apparatus therefor.
- Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
- a wireless communication system is a multiple iple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
- multiple access systems include code division mult iple access (CDMA) systems, frequency division mult iple access (FDMA) systems, time division mult iple access (TDMA) systems, orthogonal frequency division mult iple access (0FDMA) systems, SC Single carrier frequency division mult iple access (FDMA) systems.
- CDMA code division mult iple access
- FDMA frequency division mult iple access
- TDMA time division mult iple access
- OFDMA orthogonal frequency division mult iple access
- An object of the present invention is to provide a method for a terminal to report to a base station more efficiently in a wireless communication system and an apparatus therefor.
- the present invention provides a method and apparatus for efficiently transmitting / receiving control information in a DCXDual Connect ivi ty) where a terminal is simultaneously connected to two base stations.
- a method for a terminal reporting a radio link failure in a wireless communication system comprising: establishing a Radio Resource Control (RRC) connection with a first base station and transmitting and receiving data from a second base station; Monitoring a radio link for a particular SCel l (Secondary Cel l), the particular SCel l being the second base; Belonging to a station; And if a radio link failure is detected for a particular SCell, reporting the radio link failure of the SCell to the first base station.
- RRC Radio Resource Control
- a terminal for reporting a radio link failure in a wireless communication system comprising: a radio frequency (RF) module; And a processor for controlling the radio communication modules, wherein the processor forms a radio resource control (RRC) connection with a first base station, transmits and receives data from a second base station, and provides a specific SCell (Secondary Cell). And monitoring the radio link, and wherein the specific SCell belongs to the second base station, and if a radio link failure is detected for the specific SCell, the terminal reports the radio link failure of the SCell to the first base station.
- RRC radio resource control
- the specific SCell is characterized in that always active.
- the specific SCell is characterized in that the physical uplink control channel (PUCCH) transmission is configured.
- PUCCH physical uplink control channel
- the specific SCell is characterized in that the cell is a competition random access procedure is performed.
- the method may further include receiving, from either the first base station or the second base station, an indicator indicating which SCell is the specific SCell among a plurality of SCells included in the second base station.
- the method further includes applying a deactivation state to all SCells in the cell group including the specific SCell.
- E-UMTS Evolved Universal Mobile Te 1 eCommunication System
- Figure 2 illustrates the structure of an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and a gateway.
- Figures 3A-3B illustrate a user / control plane protocol.
- Figure 4 illustrates the structure of a radio frame.
- Figure 5 illustrates a Carrier Aggrega ion (CA) communication system.
- FIG. 6 illustrates scheduling when a plurality of carriers are merged.
- Figure 7 illustrates a random access (Random Access) process.
- RLF 8 shows a flowchart of a method of detecting a radio link failure (RLF).
- Figure 9 illustrates Dual Connect ivity.
- FIG. 11 is a flowchart illustrating a method for detecting an RLF in a DC situation according to an embodiment of the present invention.
- FIG. 12 illustrates a base station and a terminal that can be applied to the present invention.
- CDMA code division mult iple access
- FDMA frequency division mult iple access
- TDMA time division mult iple access
- SC _ FDMA single single
- CDMA may be implemented by a radio technology such as UTRAOJniversal Terrestrial Radio Access) or CDMA2000.
- TDMA can be implemented with wireless technologies such as Global System for Mobility Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolut ion (EDGE).
- GSM Global System for Mobility Communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolut ion
- 0FDMA may be implemented by a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX) ⁇ IEEE 802-20, Evolved UTRA (E-UTRA), or the like.
- UTRA is part of the UMTSCUniversal Mobile Teleco unicat ions System.
- 3rd Generat ion Partnership Project (3GPP) long term evolut ion (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA and employs 0FDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced
- 3GPP LTE Advanced
- FIG. 1 shows the network structure of E—UMTS.
- E-UMTS is also called LTE system.
- Communication networks are widely deployed to provide various communication services such as voice and packet data.
- an E-UMTS network includes an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), an Evolved Packet Core (EPC), and one or more UEs.
- the E-UTRAN may include one or more base stations (eNBs) 20, and the plurality of terminals 10 may be located in one and a cell.
- eNBs base stations
- One or more E-UTRAN Mobility Management Entities / System Architectures (e.g., E / SAE) Gateways 30 may be located at the network end and connected to an external network. Downlink refers to communication from the base station 20 to the terminal 10, and uplink refers to communication from the terminal to the base station.
- E / SAE E-UTRAN Mobility Management Entities / System Architectures
- the terminal 10 is a communication device carried by a user and may also be referred to as a mobile station (MS), a user terminal (UT), a subscriber station (SS), or a wireless device.
- Base station 20 is generally a fixed station that communicates with terminal 10 and may also be referred to as an access point (AP).
- the base station 20 provides the terminal 10 with end points of the user plane and the control plane.
- One base station 20 may be arranged per cell.
- An interface for transmitting user traffic or control traffic may be used between the base stations 20.
- ⁇ E / SAE gateway 30 provides end points of session and mobility management functions to terminal 10
- Base station 20 and MME / SAE gateway 30 may be connected via an S1 interface.
- the MME provides a variety of functions including distribution of paging messages to base stations 20, security control, idle mobility control, SAE bearer control, and encryption and integrity protection of non-access layer (NAS) signaling. do.
- the SAE gateway host provides a variety of functions including termination of plane packets and user plane switching for terminal (10) mobility support. ⁇ E / SAE gateway 30 is simply a gateway herein. Refer to this. However, MME / SAE gateway 30 includes both MME and SAE gateways.
- a plurality of nodes may be connected between the base station 20 and the gateway 30 through the S1 interface.
- Base stations 20 may be interconnected via an X2 interface and neighboring base stations may have a mesh network structure having an X2 interface.
- FIG. 2 shows the structure of a generic E-UTRAN and a generic gateway (30).
- the base station 20 selects the gateway 30, routes to the gateway during Radio Resource Control (RRC) activation, scheduling and transmission of paging messages, and broadcast channel (BCCH) information.
- RRC Radio Resource Control
- BCCH broadcast channel
- Functions such as scheduling and transmission of a mobile station, dynamic resource allocation for terminals 10 on both uplink and downlink, configuration and preparation of base station accounting, radio bearer control, radio admission control (RAC), and connection mobility control in LTE_ACTIVE state. Can be done.
- Gateway 30 may perform functions such as paging transmission, LTE_IDLE state management, user plane encryption, system architecture evolution (SAE) bearer control, and encryption and integrity protection of non-access layer (NAS) signaling.
- SAE system architecture evolution
- Figures 3A-3B illustrate a user-plane protocol and control-plane protocol stack for E-UMTS.
- the protocol layers are based on the first three layers (L1), the second layer (L2) and the first layer based on the lower three layers of the open system interconnect (0SI) standard model known in the art of communication systems. It can be divided into three layers (L3).
- a physical layer which is a first layer (L1), provides an information transmission service to a higher layer by using a physical channel.
- the physical layer is connected via a transport channel to a medium access control (MAC) layer located at a higher level, and data is transmitted between the MAC layer and the physical layer through the transport channel. Data is transmitted through a physical channel between the physical layer of the transmitting end and the physical layer of the receiving end.
- MAC medium access control
- the MAC layer of the second layer (L2) provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
- RLC radio link control
- the RLC layer of the second layer 2 (L2) supports reliable data transmission.
- the RLC layer is included as a functional block of the MAC layer.
- PDCP Packet Data
- L2 Convergence Protocol Layer 2 (L2) Convergence Protocol) layer performs header compression. Header compression allows efficient transmission of Internet Protocol (IP) packets, such as IPv4 or IPv6, over air interfaces with relatively small bandwidths.
- IP Internet Protocol
- the radio resource control (RRC) worm located in the lowest portion of the third worm L3 is defined only in the control plane.
- the RRC layer controls logical channels, transport channels, and physical channels in connection with the setup, reconfiguration, and release of radio bearers (RBs).
- RB means a service provided by the second layer (L2) for data transmission between the terminal 10 and the E-UTRAN.
- the RLC and MAC layers may terminate at the base station 20 and perform functions such as scheduling, automatic retransmission request (ARQ), and hybrid automatic retransmission request (HARQ).
- the PDCP layer terminates at base station 20 and may perform functions such as header compression, integrity protection, and encryption.
- the RLC and MAC layers are terminated at the base station 20 and perform the same functions as in the control plane.
- the R C layer may terminate at the base station 20 and perform functions such as broadcasting paging, RRC connection management, radio bearer (RB) control, mobility function, and terminal measurement reporting and control.
- the NAS control protocol terminates at ⁇ E of gateway 30 and performs functions such as SAE handler management, authentication, LTE_IDLE mobility handling, paging transmission in LTEJDLE state, and security control for signaling between gateway and terminal 10. Can be.
- the NAS control protocol can use three states.
- the LTE-DETACHED state is used when there is no RC entity.
- the LTEJDLE state is used when there is no RRC connection while storing the minimum terminal 10 information.
- the LTELACTIVE state is used when the RRC state is set.
- RRC state is subdivided into RRC— IDLE and RRC_C0NNECTED states.
- the terminal 10 performs a discontinuous reception (DRX) set by the NAS using a uniquely assigned ID in the tracking area. That is, the terminal 10 may receive a broadcast of system information and paging information by monitoring a paging signal at a specific paging opportunity for each UE-specific paging DRX cycle.
- DRX discontinuous reception
- the terminal 10 may transmit and / or receive data to / from the base station using the E—UTRAN RRC connection and the context in the E-UTRAN.
- the terminal 10 may report channel quality information and feedback information to the base station.
- the E-UTRAN knows the cell to which the terminal 10 belongs. Accordingly, the network may transmit and / or receive data to / from the terminal 10, control mobility such as handover of the terminal, and perform cell measurement on neighboring cells.
- FIG. 4 illustrates the structure of a radio frame.
- the E-UMTS system uses a radio frame of 10 ms and one radio frame includes 10 subframes.
- one subframe consists of two consecutive slots.
- One slot is 0.5ms long.
- one subframe includes a plurality of symbols (eg, an OFDM symbol SC-FDMA symbol).
- One subframe consists of a plurality of resource blocks, and one resource block consists of a plurality of symbols and a plurality of subcarriers.
- some symbols (eg, first symbols) of the plurality of symbols constituting the subframe may be used to transmit L1 / L2 control information.
- up to three (4) 0FDM symbols located at the front of the first slot of the subframe are allocated to a control region to which a downlink control channel is allocated for transmission of L1 / L2 control information.
- the remaining 0FDM symbol corresponds to a data region to which a Physical Downl Ink Shared Channel (PDSCH) is allocated.
- Examples of the downlink control channel include a Physical Control Format Indicator Channel (PCFICH), a Physical Downl Ink Control Channel (PDCCH), a Physical Hybrid ARQ Indicator Channel (PHICH), and the like.
- the PCFICH is transmitted in the first 0FOM symbol of a subframe and carries information on the number of 0FDM symbols used for transmission of a control channel within the subframe.
- PHICH carries a HARQ ACK / NACK (Hybrid Automatic Repeat Request acknow 1 edgment / negat i ve-acknow 1 edgment) signal in response to uplink transmission.
- DCI Down Ink Control Informat ion
- the DCI format has formats 0, 3, 3A, 4, and formats 1, 1A, IB, 1C, ID, 2, 2A, 2B, and 2C defined for uplink.
- DCI format can be used for hopping flags, resource block (RB) allocation, and modular ion (MCS). Coding Scheme (RV), Redundancy Version (RV), New Data Indicator (NDI), TPCCTransmit Power Control (TPCC), DeModulation Reference Signal (DMRS), Cyclic Shift, Request Channel Quality Information (CQI), HARQ Process Number, Transmit TPMI ted precoding matrix indicator) and PMK precoding matrix indicator).
- RV Coding Scheme
- RV Redundancy Version
- NDI New Data Indicator
- DMRS DeModulation Reference Signal
- Cyclic Shift Request Channel Quality Information
- CQI Request Channel Quality Information
- CQI HARQ Process Number
- the PDCCH includes transport format and resource allocation information of a downlink shared channel (DL—SCH), transport format and resource allocation information of an uplink shared channel (UL-SCH), a paging channel ( Px information on paging channel (PCH), system information on DL-SCH, resource allocation information of higher-layer control message such as random access response transmitted on PDSCH, Tx power control command set for individual terminals in terminal group ⁇ power It carries control instruction and activation instruction information of VoIPCVoice over IP.
- a plurality of PDCCHs may be transmitted in the control region.
- the UE may monitor the plurality of PDCCHs.
- the PDCCH is transmitted on an aggregation of one or more consecutive Control Channel Elements (CCEs).
- CCEs Control Channel Elements
- CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel conditions.
- CCE refers to a plurality of Resource Element Groups (REGs).
- the format of the PDCCH and the number of PDCCH bits are determined according to the number of CCEs.
- the base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
- the CRC is masked with an identifier (eg, Radio Network Temporary Identifier (RTI)) according to the owner or purpose of use of the PDCCH.
- RTI Radio Network Temporary Identifier
- an identifier eg, CeU-RNTI (C-R TI)
- C-R TI CeU-RNTI
- P-RNTI Paging-R TI
- SIB System Information Block
- SI-RNTI System Information RNTI
- RA-RNTI random access-RNTI
- FIG. 5 illustrates a Carrier Aggregation (CA) communication system.
- the LTE-A system uses multiple UL / DL frequency blocks to use a wider frequency band. Collect locks Use carrier aggregation or bandwidth aggregation techniques that use larger UL / DL bandwidth.
- Each frequency block is transmitted using a component carrier (CC).
- the component carrier may be understood as the carrier frequency (or center carrier, center frequency) for the corresponding frequency block.
- a plurality of UL / DL component carriers may be collected to support a wider UL / DL bandwidth.
- CCs may be adjacent to or adjacent to each other in a frequency domain.
- the bandwidth of each CC can be determined independently. It is also possible to merge asymmetric carriers in which the number of UL CCs and the number of DL CCs are different. For example, in case of two UL CCs and one UL CC, the configuration may be configured to be 2: 1.
- the DL CC / UL CC link may be fixed in the system or configured semi-statically.
- the frequency band that can be monitored / received by a specific UE may be limited to L ( ⁇ N) (X.
- Various parameters for carrier aggregation may be defined as cell specific (cell).
- the control information may be configured to be transmitted or received only through a specific CC, and may be configured to be transmitted or received only through a specific CC. May be referred to as the head CCCPrimary CC, PCC) (or anchor CC), and the remainder (X may be referred to as the secondary CCCSecondary CC, SCO.
- LTE-A uses the concept of a cell to manage radio resources.
- a sal is defined as a combination of downlink resources and uplink resources, and uplink resources are not required. Therefore, the cell may be configured with only downlink resources, or with downlink resources and uplink resources.
- a linkage between the carrier frequency (or DL CC) of the downlink resource and the carrier frequency (or UL CC) of the uplink resource may be indicated by system information.
- a cell operating on the primary frequency (or PCC) may be referred to as a primary cell (PCell), and a cell operating on the secondary frequency (or SCC) may be referred to as a secondary cell (SCell).
- PCell primary cell
- SCell secondary cell
- the PCell is used by the terminal to perform an initial connection establishment or initial connection establishment process.
- PCell may refer to a cell indicated in the handover process.
- the SCell is configurable after the RRC connection is established and can be used to provide additional radio resources. Can be.
- PCel l and SCel l may be collectively referred to as serving cells. Therefore, in the case of the UE which is in the RRC_CONNECTED state but carrier aggregation is not configured or does not support carrier aggregation, there is only one serving cell configured with PCel l.
- the network supports one or more SCel ls to support carrier merging in addition to the PCel l initially configured during connection establishment after the initial security activation (ini tial securi ty act ivat ion) process is initiated. It can be configured for the terminal.
- the PDCCH for downlink allocation may be transmitted to DL CC # 0, and the Daesung PDSCH may be transmitted to DL CC # 2.
- the introduction of a Carrier Indicator Field may be considered.
- the presence or absence of the CIF in the PDCCH may be set in a semi-static and terminal-specific (or terminal group-specific) manner by higher layer signaling (eg, RRC signaling).
- RRC signaling eg, RRC signaling
- a PDCCH on a DL CC can allocate PDSCH or PUSCH resources on a specific DL / UL CC among a plurality of merged DL / UL CCs using the CIF.
- the base station may allocate a PDCCH monitoring DL CC set to reduce the BD complexity of the terminal.
- the PDCCH monitoring DL CC set includes one or more DL CCs as part of the merged total DL CCs, and the UE performs detection / decoding of the PDCCH only on the corresponding DL CCs. That is, when the base station schedules PDSCH / PUSCH to the UE, the PDCCH is transmitted only through the PDCCH monitoring DL CC set.
- the PDCCH monitoring DL CC set may be configured in a UE-specific (UE-speci f ic), UE-group-specific or cel l-speci f ic scheme.
- the term “PDCCH monitoring DL CC” may be replaced with equivalent terms such as monitoring carriers, monitoring cells, and the like.
- the CC merged for the terminal may be replaced with equivalent terms such as serving CC, serving carrier serving cell and the like.
- FIG. 6 illustrates scheduling when a plurality of carriers are merged.
- FIG. 6 illustrates a case in which three DL CCs are merged and DL CC A is set to a PDCCH monitoring DL CC.
- each DL CC AC may be referred to as a serving CC, a serving carrier, a serving cell, and the like.
- each DL CC can transmit only the PDCCH scheduling its PDSCH without the CIF according to the LTE PDCCH rule.
- the DL CC A monitoring DL CC may transmit not only the PDCCH scheduling the PDSCH of the DL CC A using the CIF but also the PDCCH scheduling the PDSCH of another CC. In this case, PDCCH is not transmitted in DL CC B / C that is not configured as PDCCH monitoring DL CC.
- Figure 7 illustrates a random access (Random Access) process.
- the terminal receives information on random access from the base station through system information. After that, if a random access is required, the UE transmits a random access preamble (Message 1) to the base station (S710). If the base station receives the random access preamble from the terminal, the base station transmits a random access response message (Random Access Response, RAR; Message 2) to the terminal (S720). Specifically, the downlink scheduling information on the random access voice response message may be transmitted on the L1 / L2 control channel (PDCCH) by CRC masking with a random access RNTI (RA-TI). PDCCH (hereinafter, RAR-PDCCH) masked with RA-RNTI is transmitted in a common search space.
- RA-TI random access RNTI
- the UE that receives the downlink scheduling signal masked by the RA-RNTI may receive and decode the random access answer message from the scheduled PDSCH. Thereafter, the terminal checks whether the random access queuing message indicates the random access queuing information indicated to the terminal. Whether or not the random access voice response information indicated to the presence of the RAHX (Random Access preamble ID) for the preamble transmitted by the UE can be confirmed whether there exists.
- the random access voice answer information includes a timing advance indicating timing offset information for synchronization, a radio resource allocation information used for uplink, and a temporary identifier for terminal identification (eg, Temporary C-RNTI, TC-RNTI). ), And the like.
- the UE When the UE receives the random access voice response information, the UE transmits an uplink message to the uplink SCH according to the radio resource allocation information included in the response information. Message 3) (S730). After receiving the uplink message from the terminal, the base station transmits a contention resolut ion (message 4) message to the terminal (S740).
- RLF 8 shows a flowchart of a method of detecting a radio link failure (RLF).
- a terminal in a carrier aggregation system including a plurality of serving cells performs radio link monitoring (RLM) for a serving cell.
- RLM radio link monitoring
- the UE may monitor downlink radio link quality of a serving cell (eg, Primary Cel l, PCel l) based on the CRS. Specifically, the UE estimates the radio link quality in a single subframe based on the CRS, and estimates an estimated value (eg, Signal to Noise Rat io (SNR) or Signal to Interference and Noise Rat io (SINR)) as a threshold value (You can monitor / evaluate the radio link status (eg, out-of-sync or in-sync) compared to Qout, Qin). If the radio link status is in-sync, the terminal can communicate / maintain with the base station normally.
- SNR Signal to Noise Rat io
- SINR Signal to Interference and Noise Rat io
- the terminal If the radio link status is ou t- 0 f-sync, the terminal considers that the radio link has failed and reestablishes the RRC connection. An operation such as over, cell reselection, and cell measurement may be performed.
- Qout is defined as a level at which the downlink radio link cannot be reliably received, and corresponds to a 10% block error rate (BLER) of the theoretical (hypothetical) PDCCH transmission when considering the PCFICH error with the parameters of Table 1. do.
- the threshold Qin is defined as the level at which the downlink radio link can be received reliably and corresponds to 2% of the PDCCH BLER of the theoretical PDCCH transmission when considering the PCFICH error with the parameters of Table 2.
- Subframe (s) in which RLM is performed may be restricted through higher layer (eg, RRC) signaling.
- Table 1 shows PDCCH / PCFICH transmission parameters for out-of-sy c and Table 2 shows PDCCH / PCFICH transmission parameters for in-sync.
- DCI format 1A is defined in clause 5.33.1 ⁇ 3 i TS 36.212 ⁇ %
- the physical layer of the UE monitors the downlink radio link quality of the serving cell (eg, PCel l) and informs the upper layer (eg, RRC) of the out—of-sync / in-sync state. Specifically, when the radio link quality is better than Qin, the physical layer of the terminal instructs the upper layer in—sync in a radio frame in which the radio link quality is evaluated. In the non-DRX mode, the physical layer of the terminal evaluates the radio link quality every radio frame. In the DRX mode, the physical layer of the UE evaluates the radio link quality at least once every DRX cycle.
- the physical layer of the terminal instructs the upper layer out-oi-sync in the radio frame in which the radio link quality is evaluated.
- the terminal may normally perform / maintain communication with the base station.
- the terminal considers that a radio link Fare (RLF) has occurred for the radio link. If a radio link failure (RFL) occurs for PCel l, the UE procedure proceeds as shown in FIG. 8. As shown in FIG. 8, the operation related to the radio link failure has two steps.
- the first step begins with the detection of a radio link problem. This leads to radio link failure detection.
- the first step there is no UE-based mobility and it is based on the timer ⁇ .
- the second stage begins when a radio link failure is detected or handover fails. This leads to the RRCLIDLE state. In the second step, there is terminal-based mobility, and it is based on timer T2.
- the terminal resumes the RRC connection (state) and avoids switching to the RRC_IDLE state when the terminal returns to the same cell where the radio link failure is found, the cell where the radio link failure is found in the same base station is detected.
- the following procedure may be applied.
- the terminal maintains the RRC.CONNECTED state for the time T2.
- the terminal accesses the cell through a random access procedure.
- the base station identifies the identification information or identification of the terminal used in the collision resolution random access procedure (for example, the C-RNTI of the terminal in the cell where the RLF occurred, the identity of the physical layer of the cell, Short MAC-I based on the security key) to confirm that the terminal, and whether the stored context (context) of the terminal or not.
- the identification information of the terminal used in the random access procedure This may be information used for transmission of the random access preamble during the random access procedure.
- the base station when the base station finds that the stored context matches the identity of the terminal, the base station informs the terminal that the RRC connection of the terminal can be restarted. On the other hand, if the base station does not find the context, the RRC connection between the terminal and the reporter station is released, the terminal may start a procedure for establishing a new RRC connection. In this case, the terminal is switched to the RRC_IDLE state.
- Figure 9 illustrates Dual Connect ivity.
- LTE-A supports merging of multiple cells (that is, CA), and considers that all cells merged into one UE are all managed by one base station (Intra-site CA). Since intra-site CA manages all cells by one base station, signaling related to various RRC settings / reports and MAC commands / messages may be performed through any cell among all merged cells. For example, adding or releasing a particular SCel l to a set of CA cells, changing the transmission mode (TM) of a particular cell, or performing a Radio Resource Management (RRM) measurement report associated with a particular cell. The signaling involved in the execution process can be performed through any cell in the CA cell set.
- TM transmission mode
- RRM Radio Resource Management
- signaling associated with a process of activating / deactivating a specific SCel and a Buffer Status Report (BSR) for UL buffer management may be performed through any cell in the CA cell set.
- BSR Buffer Status Report
- a cell-specific PHR (Power Headroom Report) for UL power control, a TAGCTiming Advance Group (TACC) for UL synchronization control, and the like may be signaled through any cell in the CA cell set. .
- a plurality of cells with small coverage may be arranged in cells with a large coverage (eg, macro cells) for traffic optimization.
- a macro cell and a micro cell may be merged for one terminal, a macro cell is mainly used for mobility management (eg PCel l), and a micro cell is mainly used for throughput boosting (eg SCel l).
- PCel l mobility management
- SCel l throughput boosting
- cells merged into one terminal may have different coverages, and each cell may have a different base station (or corresponding node (eg, (Inter-site CA).
- the inter-site CA has a structure in which two base stations are connected to one terminal. This is called Dual Connect ivi ty (DC).
- DC Dual Connect ivi ty
- a DC has a structure in which a master base station (MeNB) and a secondary base station (SeNB) are simultaneously connected to one terminal.
- MCG Master Cel l Group
- SCG Secondary Cel l Group
- Serving cell Consisting of one or more SCel l.
- the base station and the secondary base station may be a base station that provides additional resources for the terminal.
- the terminal may maintain a scheduling radio bearer (SRB) in the MCG, while providing a high throughput, the data radio bearer (DRB) may be offloaded to the SCG.
- SRB scheduling radio bearer
- DRB data radio bearer
- the MCG is operated by the master base station on the frequency f l
- the SCG is operated by the secondary base station on the frequency f 2.
- the frequencies il and f2 may be the same.
- the backhaul interface between the master base station and the secondary base station may use a non-ideal interface (eg, an X2 interface). However, since the non-ideal interface uses a backhaul interface, there may be a significant delay, and intensive scheduling in one base station may not be possible.
- MCG bearer 1001 spl it bearer 1003, and SCG bearer 1005. Since a signaling radio bearer (SRB) is always in the MCG, the terminal is always provided with radio resources by the master base station.
- the MCG bearer 1101 allocates resources of the master base station in a DC situation. It is always located at the master base station for use.
- SCG bearer 1105 is also always located in the secondary base station in order to use the resources of the secondary base station in the DC situation.
- the spl i t bearer 1103 is a radio protocol in which both a master base station and a secondary base station are located. Thus, both the support of the master base station and the secondary base station can be used.
- the spl it bearer 1103 has one Packet Data Convergence Protocol (PDCP) entity, two Radio Link Control (RLC) entities, and two Medium Access Control (MAC) entities in one direction.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- the DC operation will have at least one radio bearer set up to use radio resources provided by the secondary base station.
- an inter-site CA situation in which PCel l (eg, CC1) and SCel K (eg, CC2) merged into one UE may be managed by BS-1 and BS-2, respectively.
- the base station ie, base station-1 that manages PCel l manages / manages the RRC function associated with the corresponding terminal.
- the RRM (Radio Resource Management) report eg RSRP (Reference Signal Received Power), RSRQCReference Signal Received Quality
- SCel l Radio Resource Management
- base station-2 may have to send an RRM measurement report to base station-1 via BH.
- the terminal sends the RRC reset command.
- Confidence response (conf irmat ion response) can be transmitted through SCel l (eg via PUSCH) rather than PCel l.
- the base station-2 may need to forward the confirmation answer to the base station-1 through the BH.
- significant latency may be involved in the inter-cell (ie, inter-base station) signaling process.
- mismatch between a base station and a terminal for CA cell set analysis may occur, and stable / efficient cell resource management and control may not be easy.
- a path in which specific signaling (eg, RRC, MAC, DCI, UCI) associated with a particular cell can be performed.
- Cell or group of cells in which a transmission / reception operation may be performed) Suggest to set up.
- a path eg, sal or group
- signal / channel transmission and / or reception operations accompanying specific signaling associated with a specific cell may be performed may be established.
- the UE may operate in a state in which a signal / channel accompanying a specific signaling associated with a specific cell is considered to be transmit and / or receive only through a set path.
- a specific cell includes a cell or a group of cells.
- the merged plurality of sals may be divided into one or more sal groups.
- each cell group consists of one or more cells.
- a cell group to which PCel l belongs is referred to as a cell group consisting of PCel l group and SCel l only.
- PCel l group There is one PCel l group, and there may be no or one or more SCel l groups.
- PDCCH may include both L-PDCCH and E-PDCCH.
- the signaling method / path proposed in the present invention can be applied only to an inter-site CA or a similar CA situation. That is, in the intra-CA situation, the signaling method / path proposed in the present invention is not applied, and the existing signaling method / path may be applied. Therefore, the base station may inform the terminal of the configuration information on the signaling method / path through the RRC message. On the other hand, the base station may consider whether the CA mode (that is, inter-site CA or intra-site CA) in order to set the signaling method / path, but the terminal is enough to know the signaling method / path applied. Accordingly, the base station can inform only the indication information about the signaling method / path applied to the terminal without informing the terminal of the CA mode. In addition, if the UE knows the CA mode in the CA configuration process, since the UE knows the signaling method / path applied to itself from the CA mode, the base station does not separately inform the UE about the signaling method / path. Can be.
- signaling for which a path is set may include the following.
- RAR Random Access Response
- PDCCH for scheduling PDSCH carrying RAR hereinafter, RAR-PDCCH
- an RRC resetting process of additionally allocating / releasing a specific cell to a set of CA cells, and a path for signaling associated with a ZAP (eg RSRP, RSRQ) report associated with a specific cell may be performed. It can be set to PCei group.
- the signaling accompanying the RRC reconfiguration / measurement report associated with a particular cell may only be transmitted and received through the PCel group (PDSCH / PUSCH on any cell belonging to it).
- a path through which cell-specific PHR for UL power control of a specific cell group (all cells belonging thereto) can be signaled may be set to the specific cell group itself. That is, the PHR for a specific sal group may be transmitted only through the specific sal group itself (PUSCH on any cell to which it belongs).
- a path for performing signaling associated with a specific cell may be limited to CC1 (group) or CC2 (group) according to the type of signaling.
- a path setting method according to signaling type includes the following.
- ⁇ signaling type MAC activation / deactivation message for SCel l (ie SCel l Act / De), PHR, BSR, TAC, DCI (eg DL / UL grant), aperiodic CSI (a-CSI) Request / Report
- the path may be set to a cell group to which the specific cell belongs (or the specific sal group itself).
- each signaling may be restricted as follows.
- a PHR may consist of only cell-specific PHRs belonging to a specific cell group.
- an independent PHR transmission period may be set for each cell group.
- the BSR can only report the UL buffer status for that particular cell group (all cells belonging to it).
- a TAC can only consist of TAG-specific TACs belonging to that particular sal group. Also, cells belonging to different sal groups may not belong to the same TAG.
- ⁇ DCI may be scheduling / control information (eg, DL / UL grant) targeting only cell (s) belonging to the specific cell group.
- cross-CC scheduling may not be allowed between cells belonging to different cell groups (that is, DCI (eg, DL / UL grant) for a cell belonging to a specific cell group is transmitted from a cell belonging to another cell group).
- DCI eg, DL / UL grant
- the a-CSI request / report may be an a-CSI request / report targeting only cell (s) belonging to the specific cell group.
- a-CSI reportable cell set designated through RRC signaling may be configured independently for each cell group (that is, a—CSI reportable cell applied to a-CSI request / reporting from a specific cell group).
- a set can only consist of sal (s) belonging to that particular sal group).
- the number of bits constituting the a-CSI request field in the DCI is independently according to the number of cells belonging to the cell group (scheduled from the corresponding DCI) (for example, 1 when the number of corresponding cells is 1). Bit, 2 More than two bits).
- the a—CSI request field in the DCI is fixed to 1 bit, and each cell through each cell is fixed. It may also operate to perform only a-CSI reporting for.
- [103]-signaling type ACK / NACK (A / N), scheduling request (SR), and periodic CSI (p-CSI) report for DL data
- [104]-Signaling for a cell belonging to a PCell group When signaling information is transmitted through a PUCCH, a path may be set to a PCell. When signaling information is transmitted through the PUSCH (ie, PUSCH piggyback-multiplexed with UL data), the path may be set to a PCell group (ie, a PUSCH transmitting cell in the PCell group).
- the path may be set to the specific SCell or a specific SCell designated in the SCell group (here, the specified specific Scell
- the specific SCell For example, one of the cell (s) configured to perform PDCCH (e.g., DL / UL grant) transmission or (DL / UL data) scheduling within the Scell group (eg, through signaling), or Among the (s) (where, among the sal (s) for which UL resource / carrier is defined) it may be automatically determined as a specific (e.g., the smallest) sal index or a cell with a specific (e.g., the largest) system bandwidth.
- a path may be set to a corresponding SCell group to which a specific SCell belongs.
- each signaling may be restricted as follows.
- the A / N transmitted through the PUCCH on the SCell belonging to the SCell group may consist of only individual A / N answer for DL data reception in the corresponding SCell.
- a predetermined SCell may be inactive when A / N transmission is required. Therefore, it may be preferable to transmit the A / N for the SCell in which DL data is received (in the case of the SCell group) only through the corresponding SCell.
- the A / N for receiving DL data from a specific SCell is the DL grant PDCCH scheduling the DL data. Can be defined / set to transmit through the transmitted cell.
- the A / N piggybacked on the PUSCH on a specific SCell belonging to the SCell group may be configured as an A / N answer for DL data reception in all cells in the SCell group.
- the SR transmitted through the PUCCH on a specific SCell belonging to the SCell group may be a UL scheduling request for only the corresponding SCell group (all cells belonging thereto).
- the p-CSI transmitted through the PUCCH on the specific SCell belonging to the SCell group may be limited to only the p-CSI for the specific SCell.
- the p-CSI piggybacked on the PUSCH on a specific SCell belonging to the SCell group may be configured only with p-CSI (s) for one or more cells in the SCell group.
- [112]-Signaling for PRACH transmission in a cell belonging to the PCell group The path of the RAR may be set to the PCell, and the path of the RAR-PDCCH may be set to the common search space on the PCell.
- the path of the RAR may be set to the specific SCell itself or a specific SCell designated in the SCell group.
- the path of the RAR-PDCCH may be set to a common search space on a specific SCell or a specific SCell designated in the SCell group (here, for a specific SCell designated, for example, a PDCCH (eg, DL / UL grant) within the SCell group).
- Transmission black is set to one of the cell (s) configured to perform scheduling (via signaling), or of the cell (s) (where the UL resource / carrier is defined) Can be automatically determined by a specific (eg smallest) cell index or a cell with a specific (eg largest) system bandwidth.
- which channel structure to carry the DCI is applied to may be set independently for each cell group.
- PDCCH can be used and DCI for SCell group can be set to transmit using EPDCCH.
- the EPDCCH can be used and the DCI for the SCell group can be configured to transmit using the PDCCH.
- the PCel! Through the group, signaling for indicating / receiving an individual Act / De for each SCell assigned to the UE can be transmitted and received, and for this, a target related to activation / deactivation in Act / De co ⁇ and transmitted through the PCell group
- the cell list may include all SCells belonging to the entire cell group (including SCells belonging to the PCell group).
- Act / De indication / response signaling of each SCell group unit may be transmitted and received through the PCell group, and for this purpose, the target cell list related to activation / deactivation in the Act / De command transmitted through the PCell group may be transmitted.
- the SCell group list may be further included in addition to the SCell list belonging to the PCell group. For example, suppose that PCell group includes PCell, SCell 1, and SCell2, and SCell group 1 includes SCell 3, SCell 4, and SCell 5 in SCell group 2, respectively.
- Act / De target cell list in / De command may be composed of SCelll: SCell2, SCell group 1, SCell group 2.
- an Act / De is indicated for a specific cell (eg, PSCell) designated to perform PUCCH transmission and / or CSS-based scheduling (eg, RAR) for each SCell group.
- PSCell a specific cell designated to perform PUCCH transmission and / or CSS-based scheduling (eg, RAR) for each SCell group.
- signaling may be transmitted and received through the PCell group, and for this, the PSCell list may be included in addition to the SCell list belonging to the PCell group in the target cell list in the Act / De command transmitted through the PCell group.
- the PSCell list may be included in addition to the SCell list belonging to the PCell group in the target cell list in the Act / De command transmitted through the PCell group.
- deactivation may be applied collectively to the entire SCell group to which the PSCell belongs, that is, to all SCells belonging to the SCell group.
- the inactivation means stopping PDCCH detection for the corresponding cell and transmitting / receiving DL / UL data through the corresponding cell. Stop, delete HARQ buffer associated with the cell, stop CSI reporting for the cell, and stop SRS transmission through the cell.
- a cell having the largest system bandwidth (especially UL BW) among cells configured to transmit PDCCH through cross CC scheduling configuration among cells belonging to one SCel l group may be designated.
- the cell may be designated as the cell having the lowest cell index (eg, ServCel l Index or SCel l lndex).
- overlap may occur between CSS and USS configured on the PSCel l.
- the overlapped region may be removed (for example, whether CIF is set or not).
- the PDCCH candidate (DCI) detected through the proposed method can always be considered / interpreted as a PDCCH candidate (DCI) established in the USS. This is because the RRC setting / resetting process is performed only through PCel l or PCel l group and uses the PDCCH candidate (DCI) set in the CSS of PCel l to determine the inconsistency / ambiguity between the terminal and the base station.
- the overlap between the CSS and the USS means that i) the payload sizes of the DCI formats between the PDCCH candidates (DCI) set in the CSS and the USS are the same, ⁇ ) the start CCE indexes of the search space are the same, and iii).
- the type / length of the DCI information field may mean a different configuration / setting.
- Case # 1 may be applied to SCel l Act / De.
- all of the paths for performing MAC signaling related to activation / deactivation for a specific SCel l may be set to the PCel l group.
- the application target of the signaling path establishment method of the present invention is not limited to the aforementioned signaling types.
- the signaling path establishment method of the present invention may be applied to other signaling related to RRC / MAC / DCI / UCI.
- case # 1 applies to signaling associated with the RRC layer
- case # 2 applies to signaling attached only to the MAC layer
- case # 3 applies to DCI / UCI related signaling.
- a method of automatically applying the signaling path setting (cases # 1, # 2 # 3 # 4) of the present invention is possible when the cell group is midnight.
- the sal group may be specified / configured differently according to signaling or a signaling set. That is, independent cell group designation / configuration may be performed for each signaling or signaling set. More specifically, in the case of a cell having a different frame structure type (TDD or FDD), or in a cell having a different CP length (standard CP or extended CP), it is basically specified / set to belong to a different cell group.
- the proposed signaling path establishment method may be applied.
- the exchange of information (data related to the terminal) between cells (site / base station that manages / controls it) merged into one terminal including the inter-site CA (or inter-base station CA) situation;
- Backhaul links disposed for transmission or the like may be configured as non-ideal backhauls with significant latency.
- significant loads / latencies may occur on the backhaul link if the sals (sites / base stations that manage / control it) directly perform all information / data exchange / transfer over the backhaul link only. have.
- information exchange / delivery between cells may be performed by replacing a backhaul link between cells (site / base station) with a radio link between cells and a terminal.
- information exchange / transmission between cells merged to the terminal may be performed through the terminal-cell radio link as follows. For convenience, it is assumed that cell 1 related information is transmitted to cell 2 through the terminal in a situation where cell 1 (or .cell group 1) and cell 2 (or cell group 2) are merged with the terminal.
- Cell group 1 is a cell group composed of one or more cells including cell 1, and is controlled by base station 1, and cell group 2 is controlled by base station 2 as a sal group including one or more cells.
- the terminal communicates with base station 1 through cell 1 (or cell group 1) and with base station 2 through cell 2 (or cell group 2). Therefore, for convenience, the following description is related to cell 1 such as information related to cell 1 or cell 1, but cell 1 may be replaced with cell group 1, which is related to cell group 1 or cell group. Report to 1 In addition, since the cell 1 may communicate with the base station 1 through the cell 1, it may be replaced with the information related to the base station 1 or report to the base station 1.
- Cell 1 may command / instruct (via a specific DL channel / signal transmitted on cell 1) to transmit / report cell 1-related specific information to cell 2.
- the terminal may transmit / report cell 1-related specific information to cell 2 (via a specific UL channel / signal transmitted on cell 2) according to the command / command of cell 1.
- the terminal may directly transmit / report the cell 1-related specific information (via a specific UL channel / signal transmitted on the seal 2) to a cell 2 at a specific time point or at a specific period.
- the specific time point may be a time point when the cell 1-related specific information is reset / changed (or an appropriate time point later).
- a specific period may be set through L1 / L2 / RRC signaling from cell 1 or cell 2.
- Cell 2 may request / instruct the UE to transmit / report cell 1-related specific information to itself (ie, cell 2) (via a specific DL channel / signal transmitted on cell 2).
- the UE may transmit / report SAL 1-related specific information (via a specific UL channel / signal transmitted on SAL 2) to SAL 2 according to a request / instruction of cell 2.
- Each cell-related specific information which is a target of the proposed inter-cell information signaling method, is applied to at least a TM, a CSI feedback mode, an SRS-related parameter, an activation / deactivation state of a corresponding cell, and a corresponding cell configured at least in the corresponding cell.
- TA may be included.
- cell 1 may command / instruct the terminal to transmit / report SRS related parameter information set in cell 1 (that is, set in cell 1 for the corresponding terminal) to cell 2.
- the terminal may transmit / report SRS related parameter information configured in cell 1 to cell 2.
- the UE may apply TA information applied to Cell 1 at a time when TA information applied to SAL 1 (that is, TA information applied to corresponding UE in SAL 1) is reset / changed (or a suitable time point thereafter). You can deliver / report directly to sal 2.
- cell 2 is activated / deactivated phase of Sal 1 to the terminal State information (that is, activation / deactivation state information applied to the corresponding cell 1 for the UE) may be requested / instructed to be transmitted / reported to SAL2.
- the terminal is a cell
- the activation / deactivation status information of 1 may be transmitted / reported to cell 2.
- Alt 2 i.e. UE report
- RLM-related information for example, RLF (Radio Link Failure). That is, when the RLF is declared as a result of performing the RLM operation on the cell 1, the terminal may transmit / report the RLF state of the cell 1 to the cell 2.
- cell 1, which is a target of performing RLM operation such as RLF determination may be a PCell or a PSCell designated to perform PUCCH transmission or CSS-based scheduling (eg, RAR) in an SCell group.
- cell 1 is set to PSCell and cell 2 is set to PCell.
- the UE When the UE detects the RLF of the PSCell, it may report the RLF detection of the PSCell to any cell belonging to the PCell or the PCell group (Alt 2 (i.e. UE report) method). On the other hand, if cell 1 is a PCell, RRC connection recovery may be performed through a process such as RACH according to a conventional process (eg, FIG. 8) when detecting the RLF of the PCell.
- a process such as RACH according to a conventional process (eg, FIG. 8) when detecting the RLF of the PCell.
- FIG. 11 is a flowchart illustrating a method for detecting an RLF in a DC situation according to an embodiment of the present invention.
- the UE is a carrier aggregation situation in which a UE is simultaneously connected to a cell group 2 including one or more sals including a sal 1 and a sal 2 including a sal 1.
- Sal group 1 and sal group 2 belong to the same base station, it can be regarded as intra-site CA, and sal group 1 and sal group
- inter-site CAs If two belong to different base stations, they can be regarded as inter-site CAs.
- the cell included in cell group 1 is controlled by base station 1, and the cell included in cell group 2 is described as an inter-site CA (or dual connectivity) situation under base station 2.
- cell 1 is a cell representing cell group 1, and cell 1 may be replaced with cell group 1, or may be replaced with base station 1.
- cell 2 is a cell representing cell group 2, and cell 2 may be replaced with cell group 2, or may be replaced with base station 2.
- Rel Radio Link Monitoring
- a problem may occur because RLM in SCel l needs to be performed in addition to PCel l. That is, in case of MeNB that manages PCel l that has RRC connection for data offload, RLF report of SCel l not controlled by MeNB from UE is required because MeNB needs to know the radio link status of SCel l not controlled by MeNB. Need to receive.
- the UE describes an RLF reporting method through RLM performance of SCel l not controlled by MeNB.
- the UE performs Radio Link Monitoring (RLM) for Cell 1 and Cell 2 (S1101).
- RLM Radio Link Monitoring
- the UE considers the RLF (Radio Link Failure) for the corresponding cell.
- the UE may be different from the method performed after the RLF detection according to the type of the cell in which the RLF is detected. For example, assume that cell 1 is PSCel l among cells managed by base station 1, which is a secondary base station that transmits and receives data to and from the terminal, and cell 2 is controlled by base station 2, which is a master base station (MeNB) that performs RRC connection with the terminal. Let PCel l be the cell.
- PSCel l may be always in an active state
- PUCCH Physical Upl Ink Control Channel
- the terminal When the RLF is detected in SAL 1 (S1103), since the RRC_C0NNECTED state of the UE is not released, the UE does not need to perform the RACH to avoid switching to the RR JDLE state unlike the occurrence of the RLF in PCel l. .
- the terminal reports the RLF detection of the SAL1 to the base station 2 (S1105).
- the terminal may also report the RLF state for the cell 1 to the base station 1.
- the UE may report various ways of reporting the RLF of the cell 1, and particularly preferably, may be a non-random access process (non-RACH) process.
- the random access procedure may be a report of a cell ID or sal index in which an RLF has occurred, or may be a report of an RLF cause or an RLF itself, but this is only an example and is not limited thereto.
- the terminal is to the base station 2 to avoid switching to the RRCJDLE state RACH may be performed (S1109).
- the identification information or identification of the terminal used in step S1109 C-RNTI of the terminal in the cell where the RLF has occurred, the identity of the physical layer of the cell, the short MAC-I round based on the security key of the cell
- the RLF is not reported to the base station 1 or the base station 2 even if the RLF occurs.
- the UE may further add an additional step of receiving an indicator indicating which SCel l is PSCel l among the plurality of SCel ls included in the base station 2 from any one of the base station 1 or the base station 2.
- the deactivation state may be automatically applied to the entire cell group belonging to the specific PSCel l or PCel l.
- the CSI measurement operation or the RRM measurement (e.g. RSRP / RSRQ calculation) operation may be further stopped.
- each cell group may be set to at most one cell within one cell group, more specifically, The cell in which the corresponding SPS-based scheduling can be set may be PCel l or PSCel l.
- FIG. 12 illustrates a base station and a terminal that can be applied to an embodiment of the present invention.
- the base station or the terminal may be replaced with a relay.
- a wireless communication system includes a base station (BS) 110 and a terminal (UE) 120.
- Base station 110 includes a processor 112, a memory 114, and a radio frequency (RF) unit 116.
- the processor 112 may be configured to implement the procedures and / or methods proposed in the present invention.
- Memory 114 Processors 112 And various information related to the operation of the processor 112.
- the RF unit 116 is connected with the processor 112 and transmits and / or receives a radio signal.
- Terminal 120 includes a processor 122, a memory 124, and an RF unit 126.
- the processor 122 may be configured to implement the procedures and / or methods proposed in the present invention.
- the memory 124 is connected with the processor 122 and stores various information related to the operation of the processor 122
- the RF unit 126 is connected with the processor 122 and transmits and / or receives a radio signal.
- the base station 110 and / or the terminal 120 may have a single antenna or multiple antennas.
- embodiments of the present invention have been mainly described based on data transmission / reception relations between a terminal and a base station.
- Certain operations described in this document as being performed by a base station may, in some cases, be performed by an upper node thereof. That is, it is obvious that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
- a base station may be replaced by terms such as fixed station, Node B, eNode B (eNB), access point, and the like.
- the terminal may be replaced with terms such as UEOJser Equipment (MSOJser Equipment), Mole le Stat ion (MS), Mole le Subscriber Stat ion (MSS).
- MSOJser Equipment UEOJser Equipment
- MS Mole le Stat ion
- MSS Mole le Subscriber Stat ion
- An embodiment according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- Hardware In the case of implementations by language, one embodiment of the invention
- Applic icat ion speci f ic integrated circui ts ASICs
- DSPs digital signal processors
- DSPs digital signal processing devices
- PLDs programmable logic devices
- FPLDs programmable programmable gate arrays
- processors controllers
- controllers Can be implemented by a microcontroller, a microprocessor, or the like.
- an embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- the present invention can be used in a wireless communication device such as a terminal, a relay, a base station, and the like.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
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KR1020167010688A KR102305629B1 (ko) | 2013-11-25 | 2014-11-25 | 단말이 기지국에게 보고하는 방법 및 이를 위한 장치 |
DE112014005033.4T DE112014005033B4 (de) | 2013-11-25 | 2014-11-25 | Verfahren zum Senden eines Berichts an eine Basisstation durch ein Endgerät und Vorrichtung dafür |
US15/039,375 US10075279B2 (en) | 2013-11-25 | 2014-11-25 | Method for deactivating secondary cells by a base station and device therefor |
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US201361908723P | 2013-11-25 | 2013-11-25 | |
US61/908,723 | 2013-11-25 | ||
US201461979493P | 2014-04-14 | 2014-04-14 | |
US61/979,493 | 2014-04-14 |
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KR (1) | KR102305629B1 (ko) |
DE (1) | DE112014005033B4 (ko) |
WO (1) | WO2015076639A1 (ko) |
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KR20160089354A (ko) | 2016-07-27 |
US20170170941A1 (en) | 2017-06-15 |
US10075279B2 (en) | 2018-09-11 |
DE112014005033T5 (de) | 2016-08-11 |
DE112014005033B4 (de) | 2023-03-30 |
KR102305629B1 (ko) | 2021-09-28 |
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