WO2013002576A2 - 상향링크 신호 전송방법 및 수신방법과, 사용자기기 및 기지국 - Google Patents
상향링크 신호 전송방법 및 수신방법과, 사용자기기 및 기지국 Download PDFInfo
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- WO2013002576A2 WO2013002576A2 PCT/KR2012/005131 KR2012005131W WO2013002576A2 WO 2013002576 A2 WO2013002576 A2 WO 2013002576A2 KR 2012005131 W KR2012005131 W KR 2012005131W WO 2013002576 A2 WO2013002576 A2 WO 2013002576A2
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Definitions
- the present invention relates to a wireless communication system.
- the present invention provides a more effective uplink / downlink signal transmission / reception method and a transmission / reception apparatus under a carrier aggregation situation in which a plurality of cells is configured.
- a typical wireless communication system performs data transmission / reception through one downlink (DL) band and one uplink (UL) band corresponding thereto (frequency division duplex (FDD) mode). Or a predetermined radio frame divided into an uplink time unit and a downlink time unit in a time domain, and perform data transmission / reception through uplink / downlink time units. time division duplex (TDD) mode).
- a base station (BS) and a user equipment (UE) transmit and receive data and / or control information scheduled in units of a predetermined time unit, for example, a subframe (SF). Data is transmitted and received through the data area set in the uplink / downlink subframe, and control information is transmitted and received through the control area set in the uplink / downlink subframe.
- various physical channels carrying radio signals are configured in uplink / downlink subframes.
- 1 shows an example of performing communication under a multi-carrier situation.
- a multi-carrier system or carrier aggregation (CA) technology refers to a technology that aggregates and uses a plurality of carriers having a band smaller than a target bandwidth for wideband support.
- Carrier aggregation performs downlink or uplink communication using a plurality of carrier frequencies, and thus performs downlink or uplink communication by carrying a base frequency band divided into a plurality of orthogonal subcarriers on one carrier frequency. It is distinguished from an orthogonal frequency division multiplexing (OFDM) technique.
- OFDM orthogonal frequency division multiplexing
- the band of the aggregated carrier may be limited to the bandwidth used in the existing system for backward compatibility with the existing system.
- the existing LTE system supports bandwidths of 1.4, 3, 5, 10, 15, and 20 MHz
- LTE-A LTE-Advanced
- LTE-A LTE-Advanced
- a new bandwidth can be defined to support carrier aggregation regardless of the bandwidth used by an existing system.
- Multi-carrier is a name that can be used interchangeably with carrier aggregation and bandwidth aggregation.
- Carrier aggregation also refers to both contiguous and non-contiguous carrier aggregation. For reference, when only one component carrier (CC) is used for communication in TDD or when only one UL CC and one DL CC are used for communication in FDD, such communication is performed in a single carrier situation (non-CA). Corresponds to communication under
- a communication method using a single carrier may not be directly applied to communication using a multi-carrier.
- a new communication method suitable for communication using a plurality of carriers should be defined while minimizing the influence on the existing system.
- a PCell group including at least a primary cell (PCell) of the plurality of cells and the plurality of cells
- Uplink control information for the SCell group is transmitted to the base station on a physical uplink channel (PUCCH) or a physical uplink shared channel (PUSCH), and the PUCCH uses an SCell configured as an anchor SCell among the one or more SCells of the SCell group.
- PUCCH physical uplink channel
- PUSCH physical uplink shared channel
- a user equipment configured with a plurality of cells (Cell) in transmitting an uplink signal to a base station, comprising: a radio frequency (RF) unit; And a processor configured to control the RF unit, wherein the processor includes a PCell group including at least a primary cell (PCell) of the plurality of cells and at least one secondary cell (SCell) of the plurality of cells.
- RF radio frequency
- an SCell group including the SCell group Configure an SCell group including the SCell group, and control the RF unit to transmit uplink control information for the SCell group to the base station on a physical uplink channel (PUCCH) or a physical uplink shared channel (PUSCH), and
- the PUCCH is transmitted to the base station using a SCell set as an anchor SCell among the one or more SCells in the SCell group, and the PUSCH is transmitted to the base station using one SCell among the one or more SCells in the SCell group.
- a PCell group including at least a primary cell (PCell) of the plurality of cells and the Setting up a SCell group including at least one secondary cell (SCell) of the plurality of cells;
- Receive uplink control information for the SCell group from the user equipment on a physical uplink channel (PUCCH) or a physical uplink shared channel (PUSCH), and the PUCCH receives a SCell configured as an anchor SCell among the one or more SCells of the SCell group.
- PUSCH physical uplink shared channel
- a radio frequency (RF) unit configured to control the RF unit, wherein the processor includes a PCell group including at least a primary cell (PCell) of the plurality of cells and at least one secondary cell (SCell) of the plurality of cells.
- PCell primary cell
- SCell secondary cell
- an SCell group including a Configure an SCell group including a), and control the RF unit to receive uplink control information for the SCell group from the user equipment on a physical uplink channel (PUCCH) or a physical uplink shared channel (PUSCH),
- the PUCCH is received from the user equipment using a SCell set as an anchor SCell among the one or more SCells of the SCell group, and the PUSCH is received from the user equipment using one SCell of the one or more SCells of the SCell group.
- a base station is provided.
- the uplink to the SCell group Control information may be transmitted from the user equipment to the base station on the PUSCH.
- the PUCCH is the anchor among PUCCH resources reserved for the anchor SCell It may be transmitted from the user equipment to the base station using a PUCCH resource associated with a control channel element (CCE) of a physical data channel (PDCCH) received using an SCell.
- CCE control channel element
- transmit power control (TPC) information in the PDCCH when the PDCCH for the SCell group is received from the base station, and the PDCCH carries a downlink grant for the anchor SCell, transmit power control (TPC) information in the PDCCH.
- TPC transmit power control
- the anchor SCell may be used for transmission / reception of a PDCCH carrying an uplink grant or a downlink grant for at least one SCell in the SCell group.
- uplink carriers at which UEs and BSs operate at different frequencies and / or uplink carriers operating at frequencies using antennas at different locations may be aggregated.
- a plurality of time synchronizations can be efficiently managed for one UE.
- different time synchronization may be applied to uplink CCs having different frequency characteristics.
- DL / UL control information can be efficiently transmitted / received in a carrier aggregation situation and a cross-carrier scheduling situation.
- 1 shows an example of performing communication under a multi-carrier situation.
- FIG. 2 illustrates an example of a radio frame structure used in a wireless communication system.
- FIG. 3 illustrates an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.
- FIG 4 illustrates a downlink subframe structure used in a 3GPP LTE (-A) system.
- FIG 5 shows an example of an uplink subframe structure used in a 3GPP LTE (-A) system.
- FIG. 6 is a diagram for describing the meaning of a cell of 3GPP LTE (-A).
- FIG. 9 is a block diagram showing the components of the transmitter 10 and the receiver 20 for carrying out the present invention.
- each component or feature may be considered to be optional unless otherwise stated.
- Each component or feature may be embodied in a form that is not combined with other components or features.
- some components and / or features may be combined to form an embodiment of the present invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced
- WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system).
- WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system).
- WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system).
- the following description focuses on the 3GPP LTE (-A) standard, but the technical spirit
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and 3GPP LTE-Advanced (LTE-A) system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
- BS base station
- UE user equipment
- the 'base station (BS)' has a meaning as a terminal node of a network that directly communicates with the UE.
- the BS communicates with the UE and / or exchanges various data and control information.
- Certain operations described herein as being performed by a BS may in some cases be performed by an upper node of the BS. That is, it is apparent that various operations performed for communication with the UE in a network composed of a plurality of network nodes including a BS may be performed by the BS or other network nodes other than the BS.
- 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point (AP), and the like.
- the UE may be fixed or mobile, and various devices that communicate with the BS to transmit and receive user data and / or various control information belong to the UE.
- 'UE' may be replaced with terms such as a terminal, a mobile station (MS), a mobile subscriber station (MSS), and a subscriber station (SS).
- PDCCH Physical Downlink Control CHannel
- PDSCH Physical Downlink Shared CHannel
- DCI downlink control information
- PUCCH Physical Uplink Control CHannel
- PUSCH Physical Uplink Shared CHannel
- PRACH Physical Random Access CHannel
- UCI uplink control information
- the expression that the user equipment transmits the PUCCH / PUSCH / PRACH is used in the same sense as transmitting the uplink control information / uplink data / any access signal on the PUSCH / PUCCH / PRACH, respectively.
- the expression that the BS transmits the PDCCH / PDSCH is used in the same sense as transmitting downlink data / control information on the PDCCH / PDSCH, respectively.
- Figure 2 illustrates an example of a radio frame structure used in a wireless communication system.
- Figure 2 (a) illustrates a radio frame structure that can be used for FDD in 3GPP LTE (-A)
- Figure 2 (b) illustrates a radio frame structure that can be used for TDD in 3GPP LTE (-A) It is illustrated.
- a radio frame used in 3GPP LTE has a length of 10 ms (307200 T s ) and consists of 10 equally sized subframes. Numbers may be assigned to 10 subframes in one radio frame.
- Each subframe has a length of 1 ms and consists of two slots. 20 slots in one radio frame may be sequentially numbered from 0 to 19. Each slot is 0.5ms long.
- the time for transmitting one subframe is defined as a transmission time interval (TTI).
- the time resource may be classified by a radio frame number (also called a radio frame index), a subframe number (also called a subframe number), a slot number (or slot index), and the like.
- the radio frame may be configured differently according to the duplex mode.
- a radio frame in the FDD mode, since downlink (DL) transmission and uplink (UL) transmission are divided by frequency, a radio frame is either a DL subframe or a UL subframe for a predetermined frequency band operating at a predetermined carrier frequency. Include only one. Since the DL transmission and the UL transmission in the TDD mode are separated by time, a radio frame includes both a downlink subframe and an UL subframe for a predetermined frequency band operating at a predetermined carrier frequency.
- Table 1 illustrates a DL-UL configuration of subframes in a radio frame in the TDD mode.
- D denotes a downlink subframe
- U denotes an UL subframe
- S denotes a special subframe.
- the singular subframe includes three fields of Downlink Pilot TimeSlot (DwPTS), Guard Period (GP), and Uplink Pilot TimeSlot (UpPTS).
- DwPTS is a time interval reserved for DL transmission
- UpPTS is a time interval reserved for UL transmission.
- Table 2 illustrates the setting of the singular frame.
- Figure 3 illustrates an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.
- Figure 3 shows the structure of the resource grid (resource grid) of the 3GPP LTE (-A) system. There is one resource grid per antenna port.
- a slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
- An OFDM symbol may mean a symbol period.
- a signal transmitted in each slot may be represented by a resource grid including N DL / UL RB * N RB sc subcarriers and N DL / UL symb OFDM symbols.
- N DL RB represents the number of resource blocks (RBs) in the downlink slot
- N UL RB represents the number of RBs in the UL slot.
- N DL RB and N UL RB depend on DL transmission bandwidth and UL transmission bandwidth, respectively.
- N DL symb represents the number of OFDM symbols in the downlink slot
- N UL symb represents the number of OFDM symbols in the UL slot.
- N RB sc represents the number of subcarriers constituting one RB.
- the OFDM symbol may be called an OFDM symbol, an SC-FDM symbol, or the like according to a multiple access scheme.
- the number of OFDM symbols included in one slot may vary depending on the channel bandwidth and the length of the CP. For example, one slot includes seven OFDM symbols in the case of a normal CP, but one slot includes six OFDM symbols in the case of an extended CP.
- FIG. 3 for convenience of description, a subframe in which one slot includes 7 OFDM symbols is illustrated. However, embodiments of the present invention can be applied to subframes having different numbers of OFDM symbols in the same manner. Referring to FIG. 3, each OFDM symbol includes N DL / UL RB * N RB sc subcarriers in the frequency domain.
- the types of subcarriers may be divided into data subcarriers for data transmission, reference signal subcarriers for transmission of reference signals, null subcarriers for guard bands, and DC components.
- the null subcarrier for the DC component is a subcarrier left unused and is mapped to a carrier frequency (carrier freqeuncy, f 0 ) in the OFDM signal generation process or the frequency upconversion process.
- the carrier frequency is also called the center frequency.
- One RB is defined as N DL / UL symb (e.g., seven) consecutive OFDM symbols in the time domain and is defined by N RB sc (e.g., twelve) consecutive subcarriers in the frequency domain. Is defined.
- N DL / UL symb e.g., seven
- N RB sc e.g., twelve
- a resource composed of one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, one RB is composed of N DL / UL symb * N RB sc resource elements.
- Each resource element in the resource grid may be uniquely defined by an index pair (k, 1) in one slot.
- k is an index given from 0 to N DL / UL RB * N RB sc ⁇ 1 in the frequency domain
- l is an index given from 0 to N DL / UL symb ⁇ 1 in the time domain.
- PRB physical resource block
- Two RBs constituting a PRB pair have the same PRB number (or also referred to as a PRB index).
- FIG 4 illustrates a downlink subframe structure used in a 3GPP LTE (-A) system.
- the DL subframe is divided into a control region and a data region in the time domain.
- up to three (or four) OFDM symbols located at the front of the first slot of a subframe correspond to a control region to which a control channel is allocated.
- a resource region available for PDCCH transmission in a DL subframe is called a PDCCH region.
- the remaining OFDM symbols other than the OFDM symbol (s) used as the control region correspond to a data region to which a Physical Downlink Shared CHance (PDSCH) is allocated.
- PDSCH region a resource region available for PDSCH transmission in a DL subframe.
- Examples of DL control channels used in 3GPP LTE include a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), and the like.
- the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols used for transmission of a control channel within the subframe.
- the PHICH carries a Hybrid Automatic Repeat Request (HARQ) ACK / NACK (acknowledgment / negative-acknowledgment) signal in response to the UL transmission.
- HARQ Hybrid Automatic Repeat Request
- DCI downlink control information
- the DCI includes resource allocation information and other control information for the UE or UE group.
- the DCI includes a transmission format and resource allocation information (DL grant) of a DL shared channel (DL-SCH), a transmission format and resource allocation of an UL shared channel (UL-SCH).
- Resource allocation information of higher-layer control messages such as information (hereinafter, UL grant), paging information on paging channel (PCH), system information on DL-SCH, random access response transmitted on PDSCH, and individual within UE group Tx power control command set for UEs, Tx power control command, activation indication information of Voice over IP (VoIP), downlink assignment index (DAI) and the like.
- the PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs).
- CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel conditions.
- the CCE corresponds to a plurality of resource element groups (REGs). For example, one CCE corresponds to nine REGs and one REG corresponds to four REs.
- REGs resource element groups
- the BS may transmit data for the UE or the UE group through the data area.
- Data transmitted through the data area is also called user data.
- a physical downlink shared channel (PDSCH) may be allocated to the data area.
- Paging channel (PCH) and downlink-shared channel (DL-SCH) are transmitted through PDSCH.
- the UE may read data transmitted through the PDSCH by decoding control information transmitted through the PDCCH.
- the DCI carried by one PDCCH has a different size and use depending on the DCI format, and its size may vary depending on a coding rate.
- a specific PDCCH is CRC masked with a Radio Network Temporary Identity (RNTI) of "A”, a radio resource (eg, frequency location) of "B” and a transmission type information of "C" (eg, It is assumed that information on data transmitted using a transport block size, modulation scheme, coding information, etc.) is transmitted through a specific DL subframe.
- RNTI Radio Network Temporary Identity
- C transmission type information
- a plurality of PDCCHs may be transmitted in the control region.
- the UE may detect its own PDCCH by monitoring the plurality of PDCCHs. Basically, since UE does not know where its PDCCH is transmitted, blind detection (also called blind decoding) is performed every subframe until all PDCCHs of the corresponding DCI format have received the PDCCH having their identifier. do.
- FIG 5 shows an example of an uplink subframe structure used in a 3GPP LTE (-A) system.
- a UL subframe may be divided into a control region and a data region in the frequency domain.
- One or several physical uplink control channels may be allocated to the control region to carry uplink control information (UCI).
- One or several physical uplink shared channels may be allocated to a data region of a UL subframe to carry user data.
- the control region and data region in the UL subframe may also be called a PUCCH region and a PUSCH region, respectively.
- a sounding reference signal (SRS) may be allocated to the data area.
- the SRS is transmitted in the OFDM symbol located at the end of the UL subframe in the time domain and in the data transmission band of the UL subframe, that is, in the data domain, in the frequency domain.
- SRSs of several UEs transmitted / received in the last OFDM symbol of the same subframe may be distinguished according to frequency location / sequence.
- subcarriers having a long distance based on a direct current (DC) subcarrier are used as a control region.
- subcarriers located at both ends of the UL transmission bandwidth include ACK / NACK for downlink data, channel state information for downlink (for example, channel quality indicator (CQI), precoding matrix). It is allocated to the transmission of uplink control information such as an indicator (Precoding Matrix Index (PMI), rank indicator (Rank Indicator, RI, etc.), scheduling request (SR).
- the DC subcarrier is a component that is not used for signal transmission and is mapped to a carrier frequency f 0 during frequency upconversion.
- the PUCCH for one UE is allocated to an RB pair belonging to resources operating at one carrier frequency in one subframe, and the RBs belonging to the RB pair occupy different subcarriers in two slots.
- the PUCCH allocated in this way is expressed as that the RB pair allocated to the PUCCH is frequency hopped at the slot boundary. However, if frequency hopping is not applied, RB pairs occupy the same subcarrier.
- the UCI carried by one PUCCH is different in size and use according to the PUCCH format, and may vary in size according to a coding rate.
- the UE is allocated a PUCCH resource for transmission of the UCI from the BS in an explicit manner or an implicit manner by a higher layer signal or a dynamic control signal.
- the physical resources used for the PUCCH depend on two parameters given by higher layers, N (2) RB and N (1) cs .
- the variable N (2) RB ⁇ 0 represents the bandwidth available for PUCCH format 2 / 2a / 2b transmission in each slot and is expressed as N RB sc integer multiples.
- N (1) cs represents the number of cyclic shifts used for the PUCCH format 1 / 1a / 1b in the resource block used for mixing the formats 1 / 1a / 1b and 2 / 2a / 2b.
- the resources used for transmission of PUCCH formats 1 / 1a / 1b, 2 / 2a / 2b, and 3 by antenna port p are non-negative integer indexes n (1, p) PUCCH , n (2, p) PUCCH ⁇ N (2) RB N RB sc + ceil (N (1) cs / 8). (N RB sc -N (1) cs -2) and n (2, p) PUCCH , respectively.
- an orthogonal sequence and / or cyclic shift to be applied to a corresponding UCI is determined from a PUCCH resource index, and resource indexes of two resource blocks in a subframe to which a PUCCH is mapped are given.
- the index of the PUCCH resource for the PUCCH format 1a / 1b is determined by being linked to a specific CCE index (eg, the lowest CCE index, n CCE ) among the indexes of CCEs used for PDCCH transmission.
- a specific CCE index eg, the lowest CCE index, n CCE
- the index of the PUCCH format 1a / 1b resource for transmission by two antenna ports p 0 and p 1 is determined as follows.
- N (1) PUCCH represents a signaling value received from a higher layer.
- n CCE corresponds to the smallest value among the CCE indexes used for PDCCH transmission.
- carrier aggregation carrier aggregation or bandwidth aggregation
- carrier aggregation carrier aggregation or bandwidth aggregation
- five 20 MHz component carriers (CCs) may be gathered in an uplink and a downlink, respectively, to support a bandwidth of 100 MHz.
- Each of the CCs may be adjacent or non-adjacent to each other in the frequency domain.
- E-UTRA Evolved Universal Terrestrial Radio Access
- the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetrical, the bandwidth of each CC may be determined independently.
- asymmetrical carrier aggregation in which the number of UL CCs and the number of DL CCs are different is possible.
- the UL CC and the DL CC are also called UL resources and DL resources, respectively.
- the BS manages X DL CCs
- the frequency band that a specific UE can receive may be limited to Y ( ⁇ X) DL CCs. In this case, the UE may monitor the DL signals / data transmitted through the Y CCs.
- the frequency band that a specific UE can transmit may be limited to M ( ⁇ L) UL CCs.
- a DL / UL CC limited to a specific UE may be referred to as a configured serving UL / DL CC in a specific UE.
- the BS may allocate a predetermined number of CCs to the UE by activating some or all of the CCs managed by the BS or deactivating some CCs.
- the BS may change the number of CCs that are activated / deactivated and may change the number of CCs that are activated / deactivated.
- Various parameters for carrier aggregation may be configured to be cell-specific, UE group-specific, or UE-specific.
- the BS assigns a cell-specific or UE-specifically available CC to the UE, at least one of the CCs once assigned unless the CC assignment for the UE is globally reset or the UE is handed over.
- One is not deactivated.
- CCs that are not deactivated are referred to as PCCs (Primary CCs)
- SCCs Secondary CCs
- Single carrier communication uses one PCC for communication between the UE and BS, and no SCC is used for communication.
- FIG. 6 is a diagram for describing the meaning of a cell of 3GPP LTE (-A).
- a cell is defined as a combination of DL resources and UL resources, that is, a combination of a DL CC and a UL CC.
- the cell may be configured with only DL resources or a combination of DL resources and UL resources.
- the linkage between the carrier frequency of the DL resource (or DL CC) and the carrier frequency of the UL resource (or UL CC) is indicated by system information.
- system information can be.
- a combination of a DL resource and a UL resource may be indicated by a system information block type 2 (SIB2) linkage.
- SIB2 system information block type 2
- the SIB2 linkage is a DL CC to which the UE is connected.
- a frequency different from that of is indicated as the frequency of the UL CC.
- the DL CC constituting one cell and the UL CC linked with the DL CC operate at different frequencies.
- the SIB2 linkage is the same frequency as the frequency of the DL CC to which the UE is connected. Denotes the frequency of the corresponding UL CC.
- the DL CC constituting one cell and the UL CC linked with the DL CC operate at the same frequency.
- the carrier frequency means a center frequency of each cell or CC.
- a cell operating on a primary frequency is referred to as a primary cell (PCell) or PCC
- a cell operating on a secondary frequency is referred to as a secondary cell (SCell) or SCC.
- PCell refers to a cell used by a UE to perform an initial connection establishment process or to initiate a connection re-establishment process.
- PCell may refer to a cell indicated in the handover process.
- the PCell may refer to a DL CC which is initially synchronized with a UE by receiving a DL synchronization signal (SS) and an UL CC linked to the DL CC.
- SS DL synchronization signal
- the carrier corresponding to the PCell is called a downlink primary CC (DL PCC), and the carrier corresponding to the PCell in the uplink is called a UL main CC (DL PCC).
- SCell means a cell that can be configured after RRC (Radio Resource Control) connection configuration is made and can be used to provide additional radio resources.
- RRC Radio Resource Control
- the SCell may, together with the PCell, form a set of serving cells for the UE.
- the serving cell may be called a serving CC.
- the carrier corresponding to the SCell in downlink is called DL Supplementary CC (DL SCC)
- UL SCC UL Supplementary CC
- the network may configure a UE in which carrier aggregation is supported by adding one or more SCells to an initially configured PCell during a connection establishment process. However, even if the UE supports carrier aggregation, the network may configure only the PCell for the UE without adding the SCell.
- a cell or an initial DL indicated in a cell or handover process used by a UE to perform an initial connection establishment process with a BS network or to initiate a connection re-establishment process The synchronized cell is called PCC, and the other cells are called SCC.
- the PCC may be called an anchor CC, a PCell, or a primary carrier, and the SCC may be called an SCell or a secondary CC.
- 3GPP LTE (-A) specific control information may be transmitted / received only through a specific CC.
- 3GPP LTE (-A) to date is associated with common control information (CCI) transmitted / received through the PCC system information (SI) and common search space (common search space) It is specified to be dedicated to DL control signaling and UL control signaling associated with uplink control information (UCI) such as ACK / NACK, CQI, etc. for DL data.
- CCI common control information
- SI PCC system information
- common search space common search space
- UCI uplink control information
- system information is always transmitted / received using the PCC, and the UE applies system information acquisition only for the PCC.
- NAS non-access stratum
- 3GPP LTE (-A) currently defines that UCI carried by PUCCH is always transmitted / received using PCC. Therefore, if the PCC is configured in the UE, the UE can transmit the PUCCH only on the PCC.
- the PDCCH carrying the UL / DL grant and the corresponding PUSCH / PDSCH are transmitted in the same cell.
- the PDCCH for the DL grant for the PDSCH to be transmitted in a specific DL CC is transmitted in the specific CC
- the PDCCH for the UL grant for the PUSCH to be transmitted in the specific UL CC is specified in the specific CC. It is transmitted on the DL CC linked with the UL CC.
- the UL / DL grant can be allowed to be transmitted in the serving cell having a good channel condition.
- 3GPP LTE may support the aggregation of a plurality of CCs and cross-carrier scheduling operations based on the same for improving data rate and stable control signaling.
- a carrier indicator field may be introduced.
- the presence or absence of the CIF in the PDCCH may be set in a semi-static and UE-specific (or UE group-specific) manner by higher layer signaling (eg, RRC signaling).
- One or more scheduling CCs may be configured for one UE.
- the scheduling CC set may be set in a UE-specific, UE group-specific or cell-specific manner. In the case of the scheduling CC, it may be configured to at least schedule itself. That is, the scheduling CC may be its own scheduled CC. Only one scheduling CC may be set for each scheduling CC. In other words, a plurality of scheduling CCs may not be set in one scheduled CC.
- a CC carrying a PDCCH is referred to as a scheduling CC, a monitoring CC, or an MCC
- a CC carrying a PDSCH / PUSCH scheduled by the PDCCH is referred to as a scheduled CC.
- the scheduling CC is part of the aggregated total DL CCs and includes a DL CC, and the UE performs detection / decoding of the PDCCH only on the corresponding DL CC. That is, in cross-carrier scheduling, both the DL / UL grant PDCCH scheduling the PDSCH / PUSCH of the scheduling CC and the scheduled CC may be transmitted / received only through the scheduling CC.
- a downlink ACK / NACK channel carrying a ACK / NACK for a PUSCH transmitted through a scheduling CC or a scheduling CC (PHICH) in the case of 3GPP LTE (-A) may be transmitted / received only through the scheduling CC.
- the ACK / NACK for the PDSCH transmitted through the scheduling CC or the scheduled CC may be an uplink control channel (PUCCH for 3GPP LTE (-A)) or an uplink data channel (PUSCH for 3GPP LTE (-A)).
- PUCCH may be transmitted / received on PCC.
- PDSCH / PUSCH of a scheduling CC or a scheduled CC refers to a PDSCH / PUSCH configured / assigned to be transmitted on a corresponding CC
- ACK / NACK of a scheduling CC or a scheduled CC refers to data transmitted on a corresponding CC. It means ACK / NACK for.
- the different frequency bands may refer to different frequency bands having a relatively large frequency interval compared to the bandwidth of one CC, and within one frequency band may be relatively smaller than the interval between the different frequency bands.
- the UE is likely to operate an independent power amplifier for each frequency band.
- UL transmission may be efficiently performed even if a single carrier property required for UL transmission is satisfied only for each frequency band.
- carrier aggregation using CCs belonging to different frequency bands is called inter-frequency carrier aggregation
- carrier aggregation using only CCs belonging to the same frequency band is called intra-frequency carrier aggregation.
- the time at which the signal transmitted by the UE reaches the BS is determined by the radius of the cell, the location of the UE in the cell, It may vary depending on the speed of movement. That is, if the BS does not manage the transmission timing for each UE, there is a possibility that a transmission signal of a specific UE may cause an interference effect on a transmission signal transmitted by another UE, thereby increasing the error rate of the received signal on the BS side. On the BS side, in order to prevent interference effects, the BS should ensure that data or signals transmitted by all UEs in a cell can be received within every valid time boundary.
- OFDM Orthogonal Frequency Division Multiplex
- Timing Advance Maintenance This adjustment is called Timing Advance Maintenance or Time Alignment Maintenance.
- One method of managing uplink time alignment is a random access procedure. That is, through the random access procedure, the BS receives a random access preamble transmitted by the UE, and using the reception information of the random access preamble, a timing advance for speeding up or slowing down the transmission timing of the UE. Calculate the timing advance (TA) value. The BS informs the UE of the calculated TA value through a random access response, and the UE uses the value to update the transmission timing. In the existing system, the random access procedure was performed only on the PCC.
- the inter-frequency carrier aggregation since the frequency characteristics are different for each frequency band, it may have a different timing advance (TA) for each frequency band in terms of UL synchronization. Therefore, in the case of the inter-frequency carrier aggregation, unlike the conventional system that performed the random access process only through the PCC, a separate random access process is performed on the SCC existing in a different frequency band from the PCC to adjust the UL transmission timing for each frequency band. Cases may arise.
- TA timing advance
- the distance between the antennas that transmit / receive the frequency and the UE varies depending on the antenna, and thus antennas of different positions One TA may not be applied to a UL CC operating at a frequency using a Tx.
- the ACK / NACK timing may be set to the UL subframe for the PCC, but may be set to the DL subframe for the SCC.
- cross-carrier scheduling may be supported even when CCs having different TDD DL-UL configurations are aggregated.
- the UL grant and PHICH timing (that is, DL subframe timing through which the UL grant and PHICH are transmitted) set in each of the scheduling CC and the scheduled CC may be different from each other.
- a specific subframe may be set to a DL subframe that is a UL grant or PHICH timing for a scheduling CC and a UL subframe for a scheduled CC, and vice versa.
- a method for resolving such UL / DL feedback timing mismatch a method of redefining to perform feedback transmission for SCC / pic scheduling to the feedback timing set in the PCC / scheduling CC may be considered.
- adjusting the feedback timing of the SCC / picched CC by the feedback timing set in the PCC / scheduling CC is not only complicated in setting the relationship but can also cause asymmetrical operation. In addition, this method is likely to involve additional feedback delay.
- CC groups the CCs according to frequency characteristics or uplink timing characteristics (hereinafter, referred to as CC groups), and manages TAs for each CC group.
- the present invention aggregates all aggregated CCs into a plurality of CC groups based on frequency band, TDD DL-UL configuration, and / or antenna positions, and sets one UL anchor CC for each CC group.
- one UE in which carrier aggregation is configured may have at least a PCC group, and when there is an SCC (s) having a TA different from the TA of the PCC, the UE may have one or more SCC groups together with the PCC group.
- the PCC group includes at least PCC and may or may not include SCC.
- Each SCC group may include one or more SCCs.
- the PCC becomes the UL anchor CC.
- one of one or more SCCs belonging to the SCC group may be set as a UL anchor CC.
- the BS may transmit information indicating whether the SCC is an UL anchor CC to the UE.
- information indicating the anchor CC among the SCCs configured in the UE may be transmitted to the UE.
- the BS may instruct the UE whether the general SCC other than the anchor SCC belongs to the PCC group or the SCC group. If the general SCC belongs to the SCC group, the BS may indicate to which UE the SCC group belongs. .
- a random access preamble (hereinafter referred to as a RACH preamble) may be independently assigned to each UL anchor CC, and thus, the UE may assign each CC.
- a random access procedure (hereinafter, referred to as a RACH procedure) may be performed for each group. Therefore, according to an embodiment of the present invention, the UE performs a random access procedure on the SCC as well as the PCC.
- the RACH process may be performed through a CC configured as a UL anchor CC (for TDD) or a DL CC linked to a UL anchor CC (for FDD).
- UL transmission using UL anchor CC eg, RACH preamble, PUSCH based on random access response, etc.
- DL transmission using PCC eg, PDCCH order, random access response, etc.
- the present invention proposes an embodiment in which a PUCCH for CC (s) belonging to each CC group is transmitted / received on an UL anchor CC set in the corresponding CC group.
- the PCC is used for transmission (s) of the PUCCH only for the PCC group
- the SCC set to the UL anchor CC is used for the PUCCH transmission for the SCC group to which the SCC belongs.
- the UE transmits the UCI associated with the serving CC (s) belonging to the PCC group to the BS through the PUCCH of the PCC, and the serving CC (s) of the SCC group to which the SCC belongs through the PUCCH of the SCC set to the UL anchor CC. ) Is transmitted to the BS.
- the UE can transmit the PUCCH not only on the PCC but also on the CC set to the UL anchor CC, and the BS can receive the PUCCH on the SCC as well as the PCC from the UE.
- the characteristics related to ACK / NACK transmission on the PUCCH of the UL anchor CC will be described in more detail as follows.
- the UL anchor CC has an implicit PUCCH (format 1a / 1b) resource and additional explicit link to the CCE resource of the CC (in case of TDD) or DL CC (in case of FDD) linked thereto for ACK / NACK transmission.
- PUCCH (format 1a / 1b / 3) resources may be defined.
- explicit and / or implicit PUCCH resources may be reserved in the UL anchor CC.
- the UE operating with TDD receives only a PDCCH / PDSCH carrying a specific DL grant for a CC set to a UL anchor CC (hereinafter, DL grant PDCCH / PDSCH), the UE grants the DL grant.
- ACK / NACK information for the PDCCH / PDSCH may be linked to an index of a resource unit (eg, CCE) in the DL grant PDCCH and transmitted to the BS using an implicit PUCCH resource that is implicitly determined.
- the specific DL grant may be a DCI in which downlink assignment index (DAI) is set to 1 while scheduling DL transmission using a UL anchor CC.
- DAI downlink assignment index
- V DL DAI DL transmission DAI
- the DAI indicates DL semi-persistent scheduling (SPS) release among predetermined subframe (s) up to the specific subframe n. This indicates the number of subframes having PDCCH and PDSCH transmission.
- the UE when the UE receives only the PDCCH carrying the DAI set to 1, the UE receives ACK / NACK information for the DL grant PDCCH / PDSCH corresponding to the DAI set to 1 by using the PUCCH resource linked to the corresponding PDCCH. May transmit to the BS.
- the UE when a UE operating in FDD receives only a DL grant PDCCH / PDSCH for a DL CC linked to an UL anchor CC, the UE receives ACK / NACK information for the DL grant PDSCH / PDSCH. May be linked to the DL grant PDCCH and transmitted to the BS using an implicit PUCCH resource that is implicitly determined.
- a TPC (Transmit Power Control) field in the DL grant PDCCH may be used for PUCCH power control information and ACK / NACK resource selection information.
- One embodiment of the present invention operates the TPC field independently for each CC group.
- the TPC field included in a specific PDCCH scheduling an UL anchor CC is used for power control for PUCCH transmission in the UL anchor CC, and all other remaining scheduling scheduling of the CC group to which the UL anchor CC belongs.
- the TPC field included in the PDCCH may be used for indicating an explicit PUCCH resource to be used for ACK / NACK transmission for the CC group among the PUCCH resources reserved for the UL anchor CC.
- the specific PDCCH may be a PDCCH carrying a DAI set to 1.
- the TPC field included in the PDCCH scheduling the DL CC linked to the UL anchor CC is used for power control for PUCCH transmission in the UL anchor CC, and the CC group to which the UL anchor CC belongs.
- the TPC field included in all remaining PDCCHs for scheduling may be used for indicating an explicit PUCCH resource to be used for ACK / NACK transmission for the CC group among PUCCH resources reserved for the UL anchor CC.
- the UL anchor CC of the SCC group is an SCC, it is distinguished from the SCC before the present invention in that the PUCCH transmission power is controlled by the TPC.
- the UL anchor CC is responsible for PUCCH transmission of ACK / NACK and / or CSI for the CC group to which the CC belongs. Therefore, in one embodiment of the present invention, the UL anchor CC or the DL linked with the UL anchor CC is activated fastest and most recently deactivated among all CCs in the CC group to which the UL anchor CC belongs. .
- the BS may set the relationship between the scheduling CC (MCC) and the scheduling CC only within the CC group. In other words, the BS may perform scheduling so that the scheduling CC and the scheduled CC scheduled by the scheduling CC belong to the same CC group. In cross-carrier scheduling, the BS may always set the UL anchor CC as the scheduling CC in the case of TDD and the DL linked to the UL anchor CC as the scheduling CC in the case of FDD.
- the UCI piggybacks on the PUSCH. Is transmitted / received.
- the UE transmits the UCI for each CC group to the BS only through the PUSCH assigned to one of the UL CC (s) in the CC group.
- the UE drops the PUCCH transmission and UCI for the CC group on the PUSCH. Transmits to BS. Even in the case of aperiodic CSI over PUSCH, the UE may be configured to transmit the CSI for the target CC of the aperiodic CSI report to the BS only on the PUSCH assigned to one of the UL CC (s) of the CC group to which the target CC belongs. Can be.
- UCI associated with CC (s) belonging to the PCC group is transmitted / received on PUCCH of PCC, or transmitted / received on PUSCH of PCC or PUSCH of SCC, and UCI associated with CC (s) belonging to SCC group is UL anchor. It is transmitted / received on the PUCCH of the SCC set to the CC or transmitted / received on the PUSCH scheduled to any SCC.
- FIG. 7 and 8 illustrate embodiments of the present invention.
- FIG. 7 illustrates a method for transmitting / receiving a DL grant and ACK / NACK thereto according to an embodiment of the present invention
- FIG. 8 illustrates an UL grant and ACK / It illustrates how the NACK is transmitted / received, respectively.
- FIGS. 7 and 8 illustrate assuming that there is no delay between reception of a DL / UL grant, reception / transmission of DL / UL data, and transmission of a DL / UL feedback signal.
- CC group 1 two DL subframes correspond to one UL subframe, and in case of CC group 2, three DL subframes correspond to one UL subframe.
- the UE transmits ACK / NACK information on DL data received in two DL subframes to the BS in an UL subframe corresponding to the two DL subframes, and in case of CC group 2
- the UE transmits ACK / NACK information for DL data received in three DL subframes to the BS in an UL subframe corresponding to the three DL subframes.
- the UL anchor CC is set for each CC group.
- the UL anchor CC may be configured as an MCC carrying DL / UL scheduling information for all CCs or some CCs in a CC group to which the UL anchor CC belongs.
- MCC carrying DL / UL scheduling information for all CCs or some CCs in a CC group to which the UL anchor CC belongs. The case of setting as MCC is illustrated.
- a BS transmits a DL grant (ie, PDSCH scheduling) and a PDSCH according to the DL grant to a UE in a DL subframe, and transmits the DL grant to a PDCCH carrying the DL grant and / or a PDSCH scheduled by the PDCCH.
- ACK / NACK information may be received from the UE in an UL subframe (eg, a UL subframe corresponding to a predetermined number of subframes starting from the DL subframe) associated with the DL subframe.
- the UE according to the present invention transmits ACK / NACK information for the PDSCH scheduled by PDCCH or PDCCH to the BS for each CC group. Referring to FIG.
- the UE may transmit ACK / NACK information for the PDCCH and / or PDSCH received on CCs CC1 and CC2 that are CCs of CC group 1 to the BS through PUCCH on CC1 configured as an UL anchor CC among CC1 and CC2. have. If there is a CC assigned with a PUSCH that collides with PUCCH transmission timing among CCs in CC group 1, the UE piggybacks ACK / NACK information for the CC group 1 in a PUSCH assigned to one CC of the CC group 1. To the BS.
- the UE may transmit ACK / NACK information for the PDCCH and / or PDSCH received on CC3 and CC4 which are CCs of CC group 2 to the BS through PUCCH on CC3 configured as UL anchor CC among CC3 and CC4. If there is a CC assigned with a PUSCH that collides with PUCCH transmission timing among CCs of CC group 2, the UE piggybacks ACK / NACK information for the CC group 2 on the PUSCH allocated to one CC of the CC group 2 To the BS.
- the BS transmits a UL grant (ie, PUSCH scheduling) to a UE in a DL subframe, and transmits a PUSCH according to the UL grant to a UL subframe associated with the DL subframe (eg, the DL subframe).
- a UL subframe associated with the DL subframe eg, the DL subframe.
- the BS performs ACK / NACK for the PUSCH in a DL subframe (for example, DL subframes starting from the UL subframe and after a predetermined number of subframes) associated with the UL subframe in which the PUSCH is received.
- the carrying PHICH may be transmitted to the UE.
- the BS transmits the ACK / NACK information for the PUSCH to the UE for each CC group, and the UE receives the ACK / NACK information for the PUSCH from the BS for each CC group.
- the BS may transmit ACK / NACK information on PUSCH (s) received on CCs CC1 and CC2 which are CCs of CC group 1 to the UE through PHICH on CC1 configured as an UL anchor CC among CC1 and CC2.
- the UE may receive a PHICH carrying ACK / NACK information for PUSCH (s) transmitted using CC (s) of CC group 1 to the BS using CC1 set as the anchor CC of CC group 1. .
- the BS may transmit ACK / NACK information for the PUSCH (s) received on CCs CC3 and CC4, which are CCs of CC group 2, to the BS via PHICH on CC3 set to UL anchor CC among CC3 and CC4, and the UE transmits the CC
- a PHICH carrying ACK / NACK information on PUSCH (s) transmitted using CC (s) of group 2 may be received by the BS using CC2 set as anchor CC of CC group 2.
- the ACK / NACK transmission timing for DL / UL transmission is merely an example, and the ACK / NACK transmission timing is FDD and / or TDD UL-DL configuration according to FIGS. 7 and 8. It may be set differently from.
- FIG. 9 is a block diagram showing the components of the transmitter 10 and the receiver 20 for carrying out the present invention.
- the transmitter 10 and the receiver 20 are radio frequency (RF) units 13 and 23 capable of transmitting or receiving radio signals carrying information and / or data, signals, messages, and the like, and in a wireless communication system.
- the device is operatively connected to components such as the memory 12 and 22 storing the communication related information, the RF units 13 and 23 and the memory 12 and 22, and controls the components.
- a processor 11, 21 configured to control the memory 12, 22 and / or the RF units 13, 23, respectively, to perform at least one of the embodiments of the invention described above.
- the memories 12 and 22 may store a program for processing and controlling the processors 11 and 21, and may temporarily store input / output information.
- the memories 12 and 22 may be utilized as buffers.
- the processors 11 and 21 typically control the overall operation of the various modules in the transmitter or receiver. In particular, the processors 11 and 21 may perform various control functions for carrying out the present invention.
- the processors 11 and 21 may also be called controllers, microcontrollers, microprocessors, microcomputers, or the like.
- the processors 11 and 21 may be implemented by hardware or firmware, software, or a combination thereof.
- application specific integrated circuits ASICs
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- the firmware or software when implementing the present invention using firmware or software, may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and configured to perform the present invention.
- the firmware or software may be provided in the processors 11 and 21 or stored in the memory 12 and 22 to be driven by the processors 11 and 21.
- the processor 11 of the transmission apparatus 10 is predetermined from the processor 11 or a scheduler connected to the processor 11 and has a predetermined encoding and modulation on a signal and / or data to be transmitted to the outside. After performing the transmission to the RF unit 13. For example, the processor 11 converts the data sequence to be transmitted into K layers through demultiplexing, channel encoding, scrambling, and modulation.
- the coded data string is also called a codeword and is equivalent to a transport block, which is a data block provided by the MAC layer.
- One transport block (TB) is encoded into one codeword, and each codeword is transmitted to a receiving device in the form of one or more layers.
- the RF unit 13 may include an oscillator for frequency upconversion.
- the RF unit 13 may include N t transmit antennas, where N t is a positive integer greater than or equal to one.
- the signal processing of the receiver 20 is the reverse of the signal processing of the transmitter 10.
- the RF unit 23 of the receiving device 20 receives a radio signal transmitted by the transmitting device 10.
- the RF unit 23 may include N r receive antennas, and the RF unit 23 frequency down-converts each of the signals received through the receive antennas to restore the baseband signal. .
- the RF unit 23 may include an oscillator for frequency downconversion.
- the processor 21 may decode and demodulate a radio signal received through a reception antenna to restore data originally transmitted by the transmission apparatus 10.
- the RF units 13, 23 have one or more antennas.
- the antenna transmits a signal processed by the RF units 13 and 23 to the outside or receives a radio signal from the outside according to an embodiment of the present invention under the control of the processors 11 and 21. , 23).
- Antennas are also called antenna ports.
- Each antenna may correspond to one physical antenna or may be configured by a combination of more than one physical antenna elements.
- the signal transmitted from each antenna can no longer be decomposed by the receiver 20.
- a reference signal (RS) transmitted corresponding to the corresponding antenna defines an antenna viewed from the perspective of the receiving apparatus 20, and includes a channel or whether the channel is a single radio channel from one physical antenna.
- RS reference signal
- the receiver 20 enables channel estimation for the antenna. That is, the antenna is defined such that a channel carrying a symbol on the antenna can be derived from the channel through which another symbol on the same antenna is delivered.
- the antenna In the case of an RF unit supporting a multi-input multi-output (MIMO) function for transmitting and receiving data using a plurality of antennas, two or more antennas may be connected.
- MIMO multi-input multi-output
- the UE operates as the transmitter 10 in the uplink and the receiver 20 in the downlink.
- the BS operates as the receiving device 20 in the uplink and the transmitting device 10 in the downlink.
- the processor, the RF unit and the memory provided in the UE will be referred to as a UE processor, the UE RF unit and the UE memory, respectively, and the processor, the RF unit and the memory provided in the BS will be referred to as a BS processor, a BS RF unit and a BS memory, respectively.
- the BS processor controls the BS RF unit to transmit the PDCCH, PDSCH, and PHICH
- the UE processor controls the UE RF unit to receive the PDCCH, PDSCH, and PHICH.
- the UE processor controls the BS RF unit to transmit the PUCCH and the PUSCH
- the BS processor controls the BS RF unit to receive the PUCCH and the PUSCH.
- the BS processor classifies CCs configured in the UE into a plurality of CC groups based on frequency band, TDD DL-UL configuration, and / or antenna positions, and sets one UL anchor CC for each CC group.
- CCs configured in the UE that is, serving CCs of the UE may be divided into at least one PCC group and zero or more SCC groups.
- the BS processor and the UE processor may set the PCC to the UL anchor CC of the PCC group.
- the BS processor may set one SCC as a UL anchor CC for each SCC group, and control the BS RF to transmit information about the UL anchor CC for each SCC to the UE.
- the UE processor may configure the UL anchor CC for each SCC group based on the information about the UL anchor CC.
- the BS processor may control the BS RF unit to transmit information indicating whether the SCC is an UL anchor CC to the UE.
- the BS processor may control the BS RF unit to transmit information indicating the anchor CC among the SCCs configured in the UE to the UE.
- the BS processor may control the BS RF unit to transmit information indicating to the UE whether the general SCC other than the anchor SCC belongs to the PCC group or the SCC group, and if the general SCC belongs to the SCC group, The BS RF unit may be controlled to indicate to the UE which SCC group belongs to.
- the BS processor may be independently allocated by a random access preamble (hereinafter, referred to as a RACH preamble) for each UL anchor CC.
- the UE processor may perform a random access procedure (hereinafter referred to as RACH process) for each CC group. Therefore, according to an embodiment of the present invention, the UE processor performs the random access procedure in the SCC as well as the PCC.
- the UE processor may control the UE RF unit to perform an RACH process through a CC configured as a UL anchor CC (for TDD) or a DL CC linked to a UL anchor CC (for FDD).
- the UE processor controls the UE RF unit to perform UL transmission (eg, RACH preamble, PUSCH based on random access response, etc.) to the BS using the UL anchor CC, and uses the PCC to DL from the BS.
- UL transmission eg, RACH preamble, PUSCH based on random access response, etc.
- PCC PCC to DL from the BS.
- the UE RF unit controls the UE RF unit to perform UL transmission (eg, RACH preamble, PUSCH based on random access response, etc.) to the BS using the UL anchor CC, and uses the PCC to DL from the BS.
- the UE RF unit controls the UE RF unit to perform UL transmission (eg, RACH preamble, PUSCH based on random access response, etc.) to the BS using the UL anchor CC, and uses the PCC to DL from the BS.
- the UE RF unit controls the UE
- the UE processor controls the UE RF UE to transmit the PUCCH for the CC (s) belonging to each CC group on the UL anchor CC set in the CC group, the BS processor is CC (s) belonging to each CC group
- the PUCCH for controls the BS RF UE to receive on the UL anchor CC set in the corresponding CC group.
- the UE processor controls the UE RF unit to transmit the UCI associated with the serving CC (s) belonging to the PCC group to the BS through the PUCCH of the PCC, and the PUCCH of the SCC group to which the SCC belongs through the PUCCH of the SCC set to the UL anchor CC.
- the BS processor controls the BS RF unit to receive, from the UE, a UCI associated with the serving CC (s) belonging to the PCC group through the PUCCH of the PCC, and the PUCCH of the SCC group to which the SCC belongs through the PUCCH of the SCC set to the UL anchor CC.
- Control the BS RF unit to receive from the UE a UCI associated with serving CC (s).
- the UE processor may Control the UE RF unit to transmit ACK / NACK information for the DL grant PDCCH / PDSCH to the BS using an implicit PUCCH resource that is implicitly determined linked to an index of a resource unit (eg, CCE) in the DL grant PDCCH. can do.
- the specific DL grant may be a DCI in which downlink assignment index (DAI) is set to 1 while scheduling DL transmission using a UL anchor CC.
- DAI downlink assignment index
- the UE RF unit operating in FDD when the UE RF unit operating in FDD receives only the DL grant PDCCH / PDSCH for the DL CC linked to the UL anchor CC, the UE processor sends an ACK / ACK for the DL grant PDSCH / PDSCH.
- the UE RF unit may be controlled to transmit NACK information to the BS using an implicit PUCCH resource linked to the DL grant PDCCH and determined implicitly.
- the BS processor and UE processor operates the TPC field independently for each CC group.
- the BS processor uses a TPC field included in a specific PDCCH scheduling an UL anchor CC for power control for PUCCH transmission in the UL anchor CC, and uses a CC group to which the UL anchor CC belongs.
- the TPC field included in all remaining PDCCHs for scheduling may be used for indicating an explicit PUCCH resource to be used for ACK / NACK transmission for the CC group among PUCCH resources reserved for the UL anchor CC.
- the specific PDCCH may be a PDCCH carrying a DAI set to 1.
- the BS processor uses the TPC field included in the PDCCH scheduling the DL CC linked to the UL anchor CC for power control for PUCCH transmission in the UL anchor CC, and the UL anchor CC is
- the TPC field included in all remaining PDCCHs for scheduling the CC group to which the CC belongs may be used for indicating an explicit PUCCH resource to be used for ACK / NACK transmission for the CC group among PUCCH resources reserved for the UL anchor CC.
- the UE RF unit receives the DCI including the TPC field and delivers it to the UE processor.
- the UE processor transmits the value of the corresponding TPC field to the UL anchor CC. If the DCI having the TPC field is scheduling information for another SCC other than the UL anchor CC, the value of the corresponding TPC field is used for determining the PUCCH transmission power and the UL anchor among the PUCCH resources reserved for the UL anchor CC. It can be used to determine the PUCCH resource to be used for transmission of ACK / NACK information for the CC group to which the CC belongs.
- the BS processor is the UL anchor CC or DL linked with the UL anchor CC is the earliest activation and the latest deactivation of all CCs in the CC group to which the UL anchor CC belongs. can do.
- the BS processor may perform scheduling so that the scheduling CC and the scheduled CC scheduled by the scheduling CC belong to the same CC group.
- the BS processor may always set the UL anchor CC as the scheduling CC in the case of TDD and set the DL linked to the UL anchor CC as the scheduling CC in the case of FDD.
- the UE processor may determine that the UCI is the PUSCH.
- the UE processor may control the UE RF unit to be piggybacked and transmit, and the BS processor may control the BS RF unit to receive the PUSCH and decode the UCI from the PUSCH.
- the UE processor controls the UE RF unit to transmit the UCI for each CC group to the BS only through the PUSCH assigned to one of the UL CC (s) in the CC group, BS
- the processor may determine that the UCI received on the PUSCH of one CC is the UCI for the CC group to which the CC belongs.
- the UE processor sends the CSI for the target CC of the aperiodic CSI report to the BS only on the PUSCH assigned to one of the UL CC (s) of the CC group to which the target CC belongs.
- the BS processor may determine that the CSI report received on the PUSCH of one CC is the CSI for the CC group to which the CC belongs. That is, UCI associated with CC (s) belonging to the PCC group is transmitted / received on PUCCH of PCC, or transmitted / received on PUSCH of PCC or PUSCH of SCC, and UCI associated with CC (s) belonging to SCC group is UL anchor. It is transmitted / received on the PUCCH of the SCC set to the CC or transmitted / received on the PUSCH scheduled to any SCC.
- uplink carriers at which UEs and BSs operate at different frequencies and / or uplink carriers operating at frequencies using antennas of different positions may be aggregated, and a plurality of UEs may be aggregated for one UE.
- the time synchronizations of can be managed efficiently.
- different time synchronization may be applied to uplink CCs having different frequency characteristics.
- DL / UL control information can be efficiently transmitted / received in a carrier aggregation situation and a cross-carrier scheduling situation.
- Embodiments of the present invention may be used in a base station or user equipment or other equipment in a wireless communication system.
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Abstract
Description
DL-UL configuration | Downlink-to-Uplink Switch-point periodicity | Subframe number | |||||||||
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ||
0 | 5ms | D | S | U | U | U | D | S | U | U | U |
1 | 5ms | D | S | U | U | D | D | S | U | U | D |
2 | 5ms | D | S | U | D | D | D | S | U | D | D |
3 | 10ms | D | S | U | U | U | D | D | D | D | D |
4 | 10ms | D | S | U | U | D | D | D | D | D | D |
5 | 10ms | D | S | U | D | D | D | D | D | D | D |
6 | 5ms | D | S | U | U | U | D | S | U | U | D |
Special subframe configuration | Normal cyclic prefix in downlink | Extended cyclic prefix in downlink | ||||
DwPTS | UpPTS | DwPTS | UpPTS | |||
Normal cyclic prefix in uplink | Extended cyclic prefix in uplink | Normal cyclic prefix in uplink | Extended cyclic prefix in uplink | |||
0 | 6592·Ts | 2192·Ts | 2560·Ts | 7680·Ts | 2192·Ts | 2560·Ts |
1 | 19760·Ts | 20480·Ts | ||||
2 | 21952·Ts | 23040·Ts | ||||
3 | 24144·Ts | 25600·Ts | ||||
4 | 26336·Ts | 7680·Ts | 4384·Ts | 5120·Ts | ||
5 | 6592·Ts | 4384·Ts | 5120·Ts | 20480·Ts | ||
6 | 19760·Ts | 23040·Ts | ||||
7 | 21952·Ts | - | - | - | ||
8 | 24144·Ts | - | - | - |
Claims (12)
- 복수의 셀(Cell)들이 구성된 사용자기기가 기지국으로 상향링크 신호를 전송함에 있어서,상기 복수의 셀들 중 적어도 주 셀(primary cell, PCell)을 포함하는 PCell 그룹과 상기 복수의 셀들 중 하나 이상의 보조 셀(secondary Cell, SCell)을 포함하는 SCell 그룹을 설정하고;상기 SCell 그룹에 대한 상향링크 제어정보를 PUCCH(physical uplink channel) 또는 PUSCH(physical uplink shared channel) 상에서 상기 기지국으로 전송하며,상기 PUCCH는 상기 SCell 그룹의 상기 하나 이상의 SCell 중 앵커 SCell로 설정된 SCell을 이용하여 상기 기지국으로 전송되고, 상기 PUSCH는 상기 SCell 그룹의 상기 하나 이상의 SCell 중 일 SCell을 이용하여 상기 기지국으로 전송되는,상향링크 제어정보 전송방법.
- 제1항에 있어서,상기 SCell 그룹 내 상기 앵커 SCell을 이용한 상기 PUCCH의 전송 타이밍과 상기 SCell 그룹 내 상기 일 SCell을 이용한 상기 PUSCH의 전송 타이밍이 충돌하는 경우, 상기 SCell 그룹에 대한 상기 상향링크 제어정보를 상기 PUSCH 상에서 상기 기지국으로 전송하는,상향링크 제어정보 전송방법.
- 제1항에 있어서,상기 SCell 그룹에 대한 상기 상향링크 제어정보가 상기 SCell 그룹 내 상기 앵커 SCell에 대한 ACK/NACK 정보인 경우, 상기 PUCCH는 상기 앵커 SCell에 예약된 PUCCH 자원들 중에서 상기 앵커 SCell을 이용하여 수신된 PDCCH(physical data channel)의 CCE(control channel element)에 연관된 PUCCH 자원을 이용하여 상기 기지국으로 전송되는,상향링크 제어정보 전송방법.
- 제1항에 있어서,상기 기지국으로부터 상기 SCell 그룹에 대한 PDCCH를 수신하고,상기 PDCCH가 상기 앵커 SCell에 대한 하향링크 그랜트를 나르는 경우에는 상기 PDCCH 내 전송전력제어(transmit power control, TPC) 정보를 기반으로 상기 PUCCH의 전송 전력을 결정하고, 상기 PDCCH가 상기 SCell 그룹의 상기 하나 이상의 SCell 중 상기 앵커 SCell이 아닌 SCell에 대한 하향링크 그랜트를 나르는 경우에는 상기 TPC 정보를 기반으로 상기 SCell 그룹에 대한 ACK/NACK 정보의 전송을 위한 PUCCH 자원을 결정하는,상향링크 제어정보 전송방법.
- 제1항에 있어서,상기 앵커 SCell은 상기 SCell 그룹 내 적어도 하나의 SCell에 대한 상향링크 그랜트 혹은 하향링크 그랜트를 나르는 PDCCH의 수신에 이용되는,상향링크 제어정보 전송방법.
- 복수의 셀(Cell)들이 구성된 사용자기기가 기지국으로 상향링크 신호를 전송함에 있어서,무선 주파수(radio frequency, RF) 유닛; 및상기 RF 유닛을 제어하도록 구성된 프로세서를 포함하되,상기 프로세서는 상기 복수의 셀들 중 적어도 주 셀(primary cell, PCell)을 포함하는 PCell 그룹과 상기 복수의 셀들 중 하나 이상의 보조 셀(secondary Cell, SCell)을 포함하는 SCell 그룹을 설정하도록 구성되고, 상기 SCell 그룹에 대한 상향링크 제어정보를 PUCCH(physical uplink channel) 또는 PUSCH(physical uplink shared channel) 상에서 상기 기지국으로 전송하도록 상기 RF 유닛을 제어하며,상기 PUCCH는 상기 SCell 그룹의 상기 하나 이상의 SCell 중 앵커 SCell로 설정된 SCell을 이용하여 상기 기지국으로 전송되고, 상기 PUSCH는 상기 SCell 그룹의 상기 하나 이상의 SCell 중 일 SCell을 이용하여 상기 기지국으로 전송되는,사용자기기.
- 제6항에 있어서,상기 SCell 그룹 내 상기 앵커 SCell을 이용한 상기 PUCCH의 전송 타이밍과 상기 SCell 그룹 내 상기 일 SCell을 이용한 상기 PUSCH의 전송 타이밍이 충돌하는 경우, 상기 프로세서는 상기 SCell 그룹에 대한 상기 상향링크 제어정보를 상기 PUSCH 상에서 상기 기지국으로 전송하도록 상기 RF 유닛을 제어하는,사용자기기.
- 제6항에 있어서,상기 SCell 그룹에 대한 상기 상향링크 제어정보가 상기 SCell 그룹 내 상기 앵커 SCell에 대한 ACK/NACK 정보인 경우, 상기 프로세서는 상기 앵커 SCell에 예약된 PUCCH 자원들 중에서 상기 앵커 SCell을 이용하여 수신된 PDCCH(physical data channel)의 CCE(control channel element)에 연관된 PUCCH 자원을 이용하여 상기 PUCCH를 상기 기지국으로 전송하도록 상기 RF 유닛을 제어하는,사용자기기.
- 제6항에 있어서,상기 프로세서는 상기 기지국으로부터 상기 SCell 그룹에 대한 PDCCH를 수신하도록 상기 RF 유닛을 제어하되,상기 프로세서는 상기 PDCCH가 상기 앵커 SCell에 대한 하향링크 그랜트를 나르는 경우에는 상기 PDCCH 내 전송전력제어(transmit power control, TPC) 정보를 기반으로 상기 PUCCH의 전송 전력을 결정하고, 상기 PDCCH가 상기 SCell 그룹의 상기 하나 이상의 SCell 중 상기 앵커 SCell이 아닌 SCell에 대한 하향링크 그랜트를 나르는 경우에는 상기 TPC 정보를 기반으로 상기 SCell 그룹에 대한 ACK/NACK 정보의 전송을 위한 PUCCH 자원을 결정하도록 구성된,사용자기기.
- 제6항에 있어서,상기 앵커 SCell은 상기 SCell 그룹 내 적어도 하나의 SCell에 대한 상향링크 그랜트 혹은 하향링크 그랜트를 나르는 PDCCH의 수신에 이용되는,사용자기기.
- 복수의 셀(Cell)들이 구성된 사용자기기가 기지국으로 상향링크 신호를 전송함에 있어서,상기 복수의 셀들 중 적어도 주 셀(primary cell, PCell)을 포함하는 PCell 그룹과 상기 복수의 셀들 중 하나 이상의 보조 셀(secondary Cell, SCell)을 포함하는 SCell 그룹을 설정하고;상기 SCell 그룹에 대한 상향링크 제어정보를 PUCCH(physical uplink channel) 또는 PUSCH(physical uplink shared channel) 상에서 상기 사용자기기로부터 수신하며,상기 PUCCH는 상기 SCell 그룹의 상기 하나 이상의 SCell 중 앵커 SCell로 설정된 SCell을 이용하여 상기 사용자기기로부터 수신되고, 상기 PUSCH는 상기 SCell 그룹의 상기 하나 이상의 SCell 중 일 SCell을 이용하여 상기 사용자기기로부터 수신되는,상향링크 제어정보 수신방법.
- 복수의 셀(Cell)들이 구성된 사용자기기가 기지국으로 상향링크 신호를 전송함에 있어서,무선 주파수(radio frequency, RF) 유닛; 및상기 RF 유닛을 제어하도록 구성된 프로세서를 포함하되,상기 프로세서는 상기 복수의 셀들 중 적어도 주 셀(primary cell, PCell)을 포함하는 PCell 그룹과 상기 복수의 셀들 중 하나 이상의 보조 셀(secondary Cell, SCell)을 포함하는 SCell 그룹을 설정하도록 구성되고, 상기 SCell 그룹에 대한 상향링크 제어정보를 PUCCH(physical uplink channel) 또는 PUSCH(physical uplink shared channel) 상에서 상기 사용자기기로부터 수신하도록 상기 RF 유닛을 제어하며,상기 PUCCH는 상기 SCell 그룹의 상기 하나 이상의 SCell 중 앵커 SCell로 설정된 SCell을 이용하여 상기 사용자기기로부터 수신되고, 상기 PUSCH는 상기 SCell 그룹의 상기 하나 이상의 SCell 중 일 SCell을 이용하여 상기 사용자기기로부터 수신되는,기지국.
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KR1020137032599A KR101586318B1 (ko) | 2011-06-28 | 2012-06-28 | 상향링크 신호 전송방법 및 수신방법과, 사용자기기 및 기지국 |
CN201280032167.5A CN103636150B (zh) | 2011-06-28 | 2012-06-28 | 发送和接收上行信号的方法、用户设备和基站 |
KR1020167000704A KR101600496B1 (ko) | 2011-06-28 | 2012-06-28 | 상향링크 신호 전송방법 및 수신방법과, 사용자기기 및 기지국 |
US14/125,478 US9491740B2 (en) | 2011-06-28 | 2012-06-28 | Method for transmitting and receiving uplink signal, user equipment, and base station |
US15/333,943 US9648637B2 (en) | 2011-06-28 | 2016-10-25 | Method for transmitting and receiving uplink signal, user equipment, and base station |
US15/479,482 US9883502B2 (en) | 2011-06-28 | 2017-04-05 | Method for transmitting and receiving uplink signal, user equipment, and base station |
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US15/333,943 Continuation US9648637B2 (en) | 2011-06-28 | 2016-10-25 | Method for transmitting and receiving uplink signal, user equipment, and base station |
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KR101600496B1 (ko) | 2016-03-08 |
CN103636150A (zh) | 2014-03-12 |
KR20160011231A (ko) | 2016-01-29 |
US20140119313A1 (en) | 2014-05-01 |
CN103636150B (zh) | 2016-11-09 |
KR20140022426A (ko) | 2014-02-24 |
WO2013002576A3 (ko) | 2013-02-28 |
US20170215174A1 (en) | 2017-07-27 |
KR101586318B1 (ko) | 2016-01-18 |
US9491740B2 (en) | 2016-11-08 |
CN107017971A (zh) | 2017-08-04 |
US20170041946A1 (en) | 2017-02-09 |
CN107017971B (zh) | 2020-06-16 |
US9883502B2 (en) | 2018-01-30 |
US9648637B2 (en) | 2017-05-09 |
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