WO2014084625A1 - 무선 통신 시스템에서 하향링크 제어 신호를 수신 또는 전송하기 위한 방법 및 이를 위한 장치 - Google Patents
무선 통신 시스템에서 하향링크 제어 신호를 수신 또는 전송하기 위한 방법 및 이를 위한 장치 Download PDFInfo
- Publication number
- WO2014084625A1 WO2014084625A1 PCT/KR2013/010900 KR2013010900W WO2014084625A1 WO 2014084625 A1 WO2014084625 A1 WO 2014084625A1 KR 2013010900 W KR2013010900 W KR 2013010900W WO 2014084625 A1 WO2014084625 A1 WO 2014084625A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- candidates
- component carrier
- epdcch
- downlink control
- downlink
- Prior art date
Links
Classifications
-
- 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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- 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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
-
- 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
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method and an apparatus therefor for receiving or transmitting a downlink control signal in a wireless communication system.
- a node is a fixed point capable of transmitting / receiving a radio signal with a user device having one or more antennas.
- a communication system having a high density of nodes can provide a higher performance communication service to the user equipment by cooperation between nodes.
- This multi-node cooperative communication method in which a plurality of nodes communicate with a user equipment using the same time-frequency resource is performed. Each node operates as an independent base station and communicates with the user equipment without mutual cooperation. It has much better performance in data throughput than its communication method.
- a multi-node system includes a plurality of nodes, each node operating as a base station or access point, an antenna, an antenna group, a radio remote header (RRH), and a radio remote unit (RRU). To perform cooperative communication. Unlike conventional centralized antenna systems in which antennas are centrally located at a base station, in a multi-node system, the plurality of nodes are typically spaced apart over a certain distance. Prize The plurality of nodes may be managed by one or more base stations or base station controllers that control the operation of each node or schedule data to be transmitted / received through each node. Each node is connected to the base station or base station controller that manages the node through a cable or dedicated line.
- This multi-node system can be viewed as a kind of MIM0 (multiple input multiple output) system in that distributed nodes can simultaneously transmit and receive different streams to communicate with a single or multiple user equipment.
- MIM0 multiple input multiple output
- the multi-node system transmits signals using nodes distributed in various locations, the transmission area that each antenna should cover is reduced, compared to the antennas provided in the existing centralized antenna system. Therefore, compared to the existing system that implemented the MIM0 technology in the centralized antenna system, the transmission power required for each antenna to transmit a signal can be reduced in the multi-node system.
- the transmission distance between the antenna and the user equipment is shortened, path loss is reduced, and high-speed data transmission is possible.
- transmission capacity and power efficiency of the cellular system can be increased, and communication performance of relatively uniform quality can be satisfied regardless of the position of the user equipment in the cell.
- the base station (s) or base station controller (s) connected to the plurality of nodes cooperate with data transmission / reception, signal loss occurring in the transmission process is reduced.
- nodes located at a distance or more perform cooperative communication with the user equipment, correlation and interference between antennas are reduced. Therefore, according to the multi-node cooperative communication scheme, a high signal to interference-plus-noise ratio (SINR) can be obtained.
- SINR signal to interference-plus-noise ratio
- Multi-node systems are emerging as a new foundation for cellular communication in parallel or in place of existing centralized antenna systems.
- the present invention proposes a method for receiving or transmitting downlink control information in a wireless communication system.
- a method for a user equipment to receive a downlink control signal in a wireless communication system comprising: receiving an enhanced physical downlink control channel (EPDCCH) from a downlink serving base station; And monitoring a plurality of EPDCCH candidates in an EPDCCH set in the received EPDCCH, wherein the EPDCCH candidates are composed of candidates for a first component carrier and a second component carrier, and candidates for the first component carrier. And candidates for the second component carrier are alternately positioned according to a specific ratio at each aggregation level L in the EPDCCH set, and the specific ratio is the number of candidates for the first component carrier and the second component carrier for the second component carrier. It is a ratio of the number of candidates, and the number of candidates for the first component carrier may be greater than or equal to the number of candidates for the second component carrier.
- EPDCCH enhanced physical downlink control channel
- the EPDCCH set includes one or more candidate pairs consisting of candidates for n first component carriers and candidates for one second component carrier subsequent to candidates for the first component carriers.
- n may be the specific ratio.
- the EPDCCH set includes one or more candidates consisting of candidates for the first element carrier having indexes k to k + n—1 and candidates for the second component carrier having index k + n. Pair, wherein n is the specific ratio, k may be a multiple of 0 and (n + 1).
- the EPDCCH set may be for localized transmission.
- the EPDCCH candidates are 0 M L] -1 at the aggregation level L in the EPDCCH set p.
- ⁇ P has an inmax
- the candidates for the second component carrier has an index according to the following equation, [14] m + fl °° ⁇ m * ⁇ ( ly W ) + ceiling (x (L> / y ) ) where m is 0 to
- ⁇ is the number of candidates for the first component carrier in the aggregation level L,) are laminated
- the number of candidates for the second component carrier at M (L) level L, and 1 VJ p may be the number of EPDCCH candidates at aggregation level L in the EPDCCH set p.
- candidates for the first component carrier may have an index except for indexes of candidates for the second component carrier from 0 to > .
- the method may further include receiving information on the number of EPDCCH candidates for the aggregation level L from the downlink serving base station.
- the aggregation level L may be determined according to the bandwidth of the first component carrier or the second component carrier.
- a terminal configured to receive a downlink control signal in a wireless communication system according to another embodiment of the present invention, comprising: a radio frequency (RF) unit; And a processor configured to control the F unit, wherein the processor receives an Enhanced Physical Downlink Control Channel (EPDCCH) from a downlink serving base station and monitors a plurality of EPDCCH candidates in an EPDCCH set in the received EPDCCH.
- EPDCCH candidates are composed of candidates for a first component carrier and a second component carrier, and candidates for the first component carrier and candidates for the second component carrier are each aggregation level in the EPDCCH set.
- the specific ratio is a ratio of the number of candidates for the first component carrier and the number of candidates for the second component carrier, and the number of candidates for the first component carrier is It may be greater than or equal to the number of candidates for the second component carrier.
- a base station configured to receive a downlink control signal in a wireless communication system according to another embodiment of the present invention, the base station comprising: a radio frequency (RF) unit; And a processor configured to control the F unit, the processor transmitting an Enhanced Physical Downlink Control Charm (EPDCCH) to a serving terminal, wherein the EPDCCH includes at least one EPDCCH set including a plurality of EPDCCH candidates.
- EPDCCH candidates consist of candidates for a first component carrier and a second component carrier.
- the candidates for the first component carrier and the candidates for the second component carrier are alternately positioned with each other according to a specific ratio at each aggregation level in the EPDCCH set, and the specific ratio is the number of candidates for the first component carrier.
- a ratio of the number of candidates for the second component carrier, and the number of candidates for the first component carrier may be greater than or equal to the number of candidates for the second component carrier.
- the present invention can efficiently transmit and receive downlink control information in a wireless communication system.
- FIG. 1 shows an example of a radio frame structure used in a wireless communication system.
- FIG. 2 shows an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.
- FIG 3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.
- FIG. 4 shows an example of an uplink (UL) subframe structure used in a 3GPP LTE / LTE-A system.
- EPDCH Enhanced Physical Downlink Control Channel
- 6 shows an EPDCCHCEnhanced Physical Downlink Control Channel
- CA 7 is a conceptual diagram illustrating a carrier aggregation (CA) scheme.
- FIG 8 shows an example in which a cross carrier scheduling technique is applied.
- FIG. 10 shows an example of determining the number of PRB pairs included in an EPDCCH set according to an embodiment of the present invention.
- FIG. 11 illustrates an example of indicating a PRB pair included in an EPDCCH set according to an embodiment of the present invention.
- FIG. 12 shows an example of allocating a PDCCH / EPDCCH candidate for each CC according to an embodiment of the present invention.
- FIG. 13 shows an example of allocating a PDCCH / EPDCCH candidate for each CC according to an embodiment of the present invention.
- FIG. 14 shows an example of allocating a PDCCH / EPDCCH candidate for each CC according to an embodiment of the present invention.
- Figure 15 shows a block diagram of an apparatus for implementing embodiment (s) of the present invention.
- a user equipment may be fixed or mobile, and various devices for transmitting and receiving user data and / or various control information by communicating with a base station (BS) UE belongs to the terminal (Terminal Equipment), MS (Mobile Station), MT (Mobi le Terminal), UT (User Terminal), SS (Subscribe Station), wireless device, PDA (Personal Digital Assistant), wireless modem, handheld device) and the like.
- a BS generally refers to a fixed station communicating with the UE and / or another BS, and communicates with the UE and another BS to exchange various data and control information.
- the BS may be referred to in other terms such as ABS dvanced base station (NB), Node-B (NB), evolved-NodeB (eNB), BTSCBase Transceiver System (BS), access point (Access Point), and processing server (PS).
- NB ABS dvanced base station
- NB Node-B
- eNB evolved-NodeB
- BS BTSCBase Transceiver System
- Access Point access Point
- PS processing server
- a node refers to a fixed point capable of transmitting / receiving a radio signal by communicating with a user equipment.
- Various forms of eNBs may be used as nodes regardless of their names.
- the node may be a BS, an NB, an eNB, a pico-cell eNB (PeNB), a home eNB (HeNB), a relay, a repeater, and the like.
- the node may not be an eNB.
- it may be a radio remote head ( ⁇ ), a radio remote unit (RRU). ⁇ , RRU generally has a power level lower than the power level of the eNB.
- RH black is less than RRU
- RRH / RRU is generally connected to eNB by dedicated line such as optical cable, so it is generally compared to cooperative communication by eNBs connected by wireless line. And cooperative communication by the eNB can be performed smoothly.
- At least one antenna is installed at one node.
- the antenna may mean a physical antenna or may mean an antenna port, a virtual antenna, or an antenna group.
- Nodes are also called points. Unlike conventional centralized antenna systems (CASs) (i.e. single node systems) where antennas are centrally located at base stations and controlled by a single eNB controller, In a node system, a plurality of nodes are usually located at a distance or more apart.
- CASs centralized antenna systems
- the plurality of nodes may be managed by one or more eNBs or eNB controllers that control the operation of each node or schedule data to be transmitted / received through each node.
- Each node may be connected to the eNB or eNB controller that manages the node through a cable or dedicated line.
- the same cell identifier (ID) may be used or different cell IDs may be used for signal transmission / reception to / from a plurality of nodes.
- ID cell identifier
- each of the plurality of nodes has one cell It works like a group of antennas.
- the nodes are having a different cell ID from dajeung 'node system, such a multi-node system (e.g., macro cell / eu pico cell-cell / femto) multi-cell can be seen as a system.
- a multi-node system e.g., macro cell / eu pico cell-cell / femto
- the network formed by the multiple cells is particularly called a multi-tier network.
- the cell ID of the eNB and the cell ID of the RRH / RRU may be the same or may be different. If the RRH / RRU uses different cell IDs for the eNBs, the / RRU and the eNB both operate as independent base stations. '
- one or more eNBs or eNB controllers connected to a plurality of nodes are configured to simultaneously transmit or receive signals to a UE through some or all of the plurality of nodes. You can control multiple nodes. Differences exist between multi-node systems depending on the identity of each node, the type of implementation of each node, etc., but in that multiple nodes participate together in providing communication services to a UE on a given time-frequency resource. Node systems are different from single node systems (eg CAS, conventional MIM0 systems, conventional relay systems, conventional repeater systems, etc.).
- embodiments of the present invention regarding a method for performing data cooperative transmission using some or all of a plurality of nodes may be applied to various types of multi-node systems.
- a node generally refers to an antenna group spaced apart from another node by a predetermined distance or more
- embodiments of the present invention described later may be applied even when a node means any antenna group regardless of the interval.
- the eNB may control the node configured as the H-pol antenna and the node configured as the V-pol antenna, and thus embodiments of the present invention may be applied.
- [44] Transmit / receive a signal through a plurality of transmit (Tx) / receive (Rx) nodes, transmit / receive a signal through at least one node selected from the plurality of transmit / receive nodes, or downlink signal
- a communication scheme for differentiating a node transmitting an uplink signal from a node receiving an uplink signal is called multi-eNBMIMO or CoMP (Coordinated Multi-Point TX / RX).
- the cooperative transmission scheme of cooperative communication between nodes can be classified into JP (joint processing) and scheduling coordinat ion.
- JT joint transmission
- JR joint reception
- DPS dynamic point selection
- CS coordinated scheduling
- CB coordinated beamforming
- DCS dynamic cell selection
- JT in JP refers to a communication scheme in which a plurality of nodes transmit the same stream to the UE
- JR refers to a communication scheme in which a plurality of nodes receive the same stream from the UE.
- the UE / eNB synthesizes the signals received from the plurality of nodes and restores the stream.
- DPS refers to a communication technique in which a signal is transmitted / received through a node selected according to a plurality of nodes.
- a node having a good channel state between the UE and the node will be generally selected as the communication node, the reliability of signal transmission can be improved.
- a cell refers to a certain geographic area in which one or more nodes provide a communication service. Therefore, in the present invention, communication with a specific cell may mean communication with an eNB or a node that provides a communication service to the specific cell.
- the downlink / uplink signal of a specific cell means a downlink / uplink signal to / from an eNB or a node providing a communication service to the specific cell.
- a cell that provides uplink / downlink communication service to a UE is particularly called a serving cell.
- the channel state / quality of a particular cell refers to the channel state / quality of a channel or communication link formed between an eNB or a node and a UE providing a communication service to the specific cell.
- a UE transmits a downlink channel state from a specific node on a channel CSI-RS Channel State Information Reference Signal (RCS) resource to which the antenna port (s) of the specific node is assigned to the specific node. Measurement can be made using CSI-RS (s).
- RCS Channel State Information Reference Signal
- adjacent nodes transmit corresponding CSI-RS resources on CSI-RS resources orthogonal to each other.
- Orthogonality of CSI-RS resources means that CSI-RS is determined by CSI-RS resource configuration, subframe offset, and transmission period that specify symbols and subcarriers carrying CSI-RS. This means that at least one of a subframe configuration and a CSI-RS sequence specifying the allocated subframes is different from each other.
- Physical Downlink Control CHannel (PDCCH) / Physical Control Format Indicator CHanne 1) / PH I CH ((Physical Hybrid automatic retransmit) request Indicator CHanne 1) / PDSCH (Physica 1 Downlink Shared CHannel) are Downlink Control Informat ion (DCI) / Control Format Indicator (CFI) / Downlink ACK / NAC C ACKnow 1 egement / Negat i ve ACK A set of time-frequency resources or a set of resource elements that carry data.
- DCI Downlink Control Informat ion
- CFI Control Format Indicator
- PUCCH Physical Uplink Control CHannel
- PUSCH Physical Uplink Shared CHannel
- PRACH Physical Random Access CHannel
- UCI uplink ink control format
- PRACH Physical Random Access CHannel
- PDCCH / PCF I CH / PH I CH / PDSCH / PUCCH / PUSCH / PRACH resource It is called PDCCH / PCF I CH / PH I CH / PDSCH / PUCCH / PUSCH / PRACH resource.
- the expression that the user equipment transmits PUCCH / PUSCH / PRACH is used in the same sense as transmitting uplink control information / uplink data / random access signal on or through the PUSCH / PUCCH / PRACH, respectively.
- the expression that the eNB transmits the PDCCH / PCFICH / PHICH / PDSCH is used in the same sense as transmitting downlink data / control information on or through the PDCCH / PCFiCH / PHICH / PDSCH, respectively.
- Figure 1 illustrates an example of a radio frame structure used in a wireless communication system.
- Figure i ( a ) shows a frame structure for frequency division duplex (FDD) used in the 3GPP LTE / LTE-A system
- Figure 1 (b) is used in the 3GPP LTE / LTE-A system Shows a frame structure for time division duplex (TDD).
- FDD frequency division duplex
- TDD time division duplex
- a radio frame used in a 3GPP LTE / LTE-A system has a length of 10 ms (30720 () s), and is composed of 10 equally sized subframes (subframes, SFs). . 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 ( ⁇ ).
- the time resource is a radio frame number (or It may be distinguished by a radio frame index), a subframe number (or a subframe number), a slot number (black is a slot index), and the like.
- the radio frame may be configured differently according to the duplex mode. For example, in the FOD mode, since downlink transmission and uplink transmission are divided by frequency, a radio frame includes only one of a downlink subframe or an uplink subframe for a specific frequency band. In the TDD mode, since downlink transmission and uplink transmission are classified by time, a radio frame includes both a downlink subframe and an uplink subframe for a specific frequency band.
- Table 1 illustrates a DL-UL configuration of subframes in a radio frame in the TDD mode.
- D represents a downlink subframe
- U represents an uplink subframe
- S represents a special subframe.
- the singular subframe includes three fields of Down Ink Ink TimeSlot (DwPTS), Guard Period (GP), and UpPTSCUpHnk Pi lot TimeSlot (GPW).
- DwPTS is a time interval reserved for downlink transmission
- UpPTS is a time interval reserved for uplink transmission.
- Table 2 illustrates the configuration of a specific subframe.
- FIG. 2 shows an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.
- FIG. 2 shows a structure of a resource grid of a 3GPP LTE / LTE-A system. There is one resource grid per antenna port.
- the pilot includes a plurality of 0rthogonal frequency division multiplexing (0FDM) symbols in the time domain, and includes a plurality of resource blocks (RBs) in the frequency domain.
- An OFDM symbol may mean a symbol period.
- subcarrier It can be represented by a resource grid composed of symbols. here, It represents the number of resource blocks (RBs) in the downlink slot, and V «s represents the number of RBs in the UL slot. And RB is
- the OFDM symbol may be called an OFDM symbol, an SOFDM symbol, or the like according to a multiple access scheme.
- the number of OFDM symbols included in one slot may vary according to the channel bandwidth and the length of the CP. For example, in case of a normal CP, one slot may have seven slots. OFDM symbol, but in the case of an extended CP, one slot includes six OFDM symbols.
- FIG. 2 illustrates a subframe in which one slot includes 7 OFDM symbols for convenience of description, embodiments of the present invention can be applied to subframes having other numbers of OFDM symbols in the same manner. 2, the angle
- the OFDM symbol includes * i / 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 left unused and is mapped to a carrier frequency (carrier freqeuncy, fO) during the OFDM signal generation process or frequency upconversion.
- the carrier frequency is also called the center frequency.
- One RB includes b consecutive OFDM seams in the time domain (eg, seven).
- Each resource element in the resource grid may be uniquely defined by an index pair (k, 1) in one slot. k is from 0 in the frequency domain
- N DLIUL N RB N D l ⁇ i RB * i sc -1 The index is assigned to 1, and 1 is the index assigned from 0 to symb -1 in the time domain.
- Two RBs occupying A consecutive same subcarriers in one subframe and one located in each of two slots of the subframe are referred to as physical resource block (PRB) pairs.
- PRB physical resource block
- Two RBs constituting a PRB pair have the same PRB number (or also referred to as a PRB index).
- VRB is a kind of logical resource allocation unit introduced for resource allocation.
- the VRB has the same size as the PRB.
- FIG 3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.
- a 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 are defined in 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 CHannel (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 PCFICH (Physical Control Format Indicator Channel), PDCCH (Physical Downlink Control Channel), PHICH (Physical Hybrid ARQ indicator Channel).
- the PCFICH is transmitted in the first 0FDM symbol of a subframe and carries information on the number of 0FDM symbols used for transmission of the control channel within the subframe.
- PHICH announces HARQ Hybrid Automatic Repeat Request (ACK / NACK) acknowledgment / negat i-acknow 1 edgment (ACK) signal in response to UL transmission. ;
- DCI downlink control information
- 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 of a downlink shared channel (DL-SCH), a transmission format and resource allocation information of a UL shared channel (uplink shared channel, UL-SCH), and a paging channel.
- channel, PCH paging information
- system information on the DL-SCH resource allocation information of an upper layer control message such as random access response transmitted on the PDSCH, and individual UEs in the UE group.
- a transmit power control command activation indication information of voice over IP (VoIP), a downlink assignment index (DAI), and the like.
- the transmission format and resource allocation information of a downlink shared channel (DL-SCH) may also be called DL scheduling information or a DL grant, and an uplink shared channel (UL-SCH).
- the transmission format and the resource allocation information of the is also called UL scheduling information or UL grant (UL grant).
- 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.
- formats 0 and 4 for uplink and formats 1, 1A, IB, 1C, 1D, 2, 2A, 2B, 2C, 3, and 3A are defined for uplink.
- Control ' information ' such as reference signal, UL index, CQ I (channel quality information) request, DL assignment index, HA Q process number, transmitted precoding matrix indicator (TPMI), precoding matrix indicator (PMI) information
- TPMI transmitted precoding matrix indicator
- PMI precoding matrix indicator
- the DCI format that can be transmitted to the UE varies according to a transmission mode (TM) configured in the IE.
- TM transmission mode
- DCI formats not all DCI formats can be used for a UE configured for a particular transmission mode, but only certain DCI format (s) can be used for the specific transmission mode.
- 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 refers to a plurality of resource element groups (REGs). For example, one CCE can be matched to nine REGs and one REG to four REs.
- REGs resource element groups
- a CCE set in which a PDCCH can be located is defined for each UE.
- the CCE set in which the UE can discover its PDCCH is referred to as a PDCCH search space, simply a search space (SS).
- SS search space
- An individual resource to which a PDCCH can be transmitted in a search space is called a PDCCH candidate.
- the collection of PDCCH candidates to be monitored by the UE is defined as a search space.
- Each DCI format in 3GPP LTE / LTE-A system The search spaces for different sizes may have different sizes, and a dedicated search space and a common search space are defined.
- the dedicated search space is a UE-specific search space and is configured for each individual UE.
- the common search space is configured for a plurality of UEs. The following illustrates aggregation levels that define search spaces.
- One PDCCH candidate performs 1, 2, 4, or 8 CCEs according to the CCE aggregation level
- the eNB transmits the actual PDCCH (DCi) on any PDCCH candidate in the search space, and the UE Monitor the search space to find the PDCCH (DCI).
- monitoring means attempting decoding of each PDCCH in a corresponding search space according to all monitored DCI formats.
- the UE may detect its own PDCCH by monitoring the plurality of PDCCHs. Basically, since the UE does not know where its PDCCH is transmitted, every subframe attempts to decode the PDCCH until all PDCCHs of the corresponding DCI format have detected a PDCCH having their own identifier. It is called blind detection (blind decoding).
- the eNB may transmit data for the UE or the UE group through the data region. Data transmitted through the data area is also called user data.
- PDSCH Physical Downlink Shared CHannel
- Paging channel (PCH) and downlink ink-shared channel (DL-SCH) are transmitted through PDSCH.
- the UE decodes the control information transmitted through the PDCCH and transmits it through the PDSCH. You can read the transmitted data.
- the PDCCH includes information indicating which UE data of the PDSCH is transmitted to the UE group or how the UE or the UE group should receive and decode the PDSCH data.
- a specific PDCCH is masked with a cyclic redundancy check (CRC) with a Radio Network Temporary Identity (RNTI) of "A", and a radio resource (eg, frequency location) of "B” and a transmission type information of Assume that information about data transmitted using (eg, a transport block size, modulation scheme, coding information, etc.) is transmitted through a specific DL subframe.
- CRC cyclic redundancy check
- RNTI Radio Network Temporary Identity
- a reference signal reference signal (RS) to be compared with the data signal.
- the reference signal refers to a signal of a predetermined special waveform that the eNB and the UE know each other, which the eNB transmits to the UE or the UE, and is also called a pilot (pi lot).
- Reference signals are divided into cell-specific RSs shared by all UEs in a cell and demodulation RSs (DMRSs) dedicated to a specific UE.
- DMRSs demodulation RSs
- the DMRS transmitted by the eNB for demodulation of downlink data for a specific UE may also be specifically referred to as UE-specific RS.
- the DM RS and the CRS may be transmitted together, but only one of the two may be transmitted. However, if only the DM RS is transmitted without a CRS in the downlink, the DM RS transmitted by applying the same precoder as the data can be used only for demodulation purposes, so that a RS for channel measurement must be provided separately.
- an additional measurement RS CSI-RS
- the CSI-RS is transmitted every predetermined transmission period consisting of a plurality of subframes, unlike the CRS transmitted every subframe, based on the fact that the channel state is not relatively large over time.
- FIG. 4 shows an example of an uplink (UL) subframe structure used in a 3GPP LTE / LTE-A system.
- a UL subframe may be divided into a control region and a data region in the frequency domain.
- One or several PUCCHs (physical uplink control channel) to the control area to carry uplink control information (UCI) Can be assigned.
- One or several PUSCHs (physical up 1 ink shared channel) may be allocated to the data region of the UL subframe to carry user data.
- 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 are allocated for transmission of uplink control information.
- the DC subcarriers are left unused for signal transmission and are mapped to the carrier frequency fO during the frequency upconversion process.
- 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 B 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, the RB pair occupies the same subcarrier.
- the PUCCH may be used to transmit the following control information.
- HARQ-ACK A correct answer to a PDCCH and / or a correct answer to a downlink data packet (eg, a codeword) on a PDSCH.
- PDCCH black indicates whether the PDSCH has been successfully received.
- HARQ-ACK 1 bit is transmitted in response to a single downlink codeword, and HARQ-ACK 2 bits are transmitted in response to two downlink codewords.
- HARQ-ACK male answer includes a positive ACK (simply ACK), a negative ACK (hereinafter NACK), Discrete Inuous Transmission (DTX) or NACK / DTX.
- NACK negative ACK
- DTX Discrete Inuous Transmission
- NACK Discrete Inuous Transmission
- CSK Channel State Information Feedback information for the downlink channel.
- MUL0 Multiple Input Multiple Output
- PMK Precoding Matrix Indicator includes RKRank Indicator and PMK Precoding Matrix Indicator.
- the amount of uplink control information (UCI) that a UE can transmit in a subframe depends on the number of SC-FDMA available for transmission of control information.
- SC-FDMA available for UCI means the remaining SC-FDMA symbol with the exception of the SC-FDMA symbol for reference signal transmission in the subframe.
- SRS Sounding Reference Signal
- the reference signal is used for coherent detection of PUCCH. Used.
- PUCCH supports various formats according to the transmitted information. In the following LTE / LTE-A system, a mapping relationship between a PUCCH format and a UCI is shown.
- the PUCCH format 1 series is mainly used to transmit ACK / NACK information
- the PUCCH format 2 series is mainly used to carry channel state information (CSI) such as CQI / PMI / RI
- PUCCH format 3 series is mainly used to transmit ACK / NACK information.
- a signal When a packet is transmitted in a wireless communication system, a signal may be distorted during transmission because the transmitted packet is transmitted through a wireless channel. In order to receive the distorted signal right at the receiver, the distortion must be corrected in the received signal using channel information. In order to find out the channel information, a signal known to both the transmitting side and the receiving side is transmitted, and a method of finding the channel information with the degree of distortion when the signal is received through the channel is mainly used. The signal is referred to as a pilot signal or a reference signal. In case of transmitting / receiving data using multiple antennas, it is necessary to know the channel condition between each transmitting antenna and the receiving antenna to receive the correct signal. Therefore, in more detail for each transmitting antenna, a separate reference signal should exist for each antenna port (antenna port).
- the reference signal may be divided into an uplink reference signal and a downlink reference signal.
- an uplink reference signal as an uplink reference signal,
- DM-RS DeModulat ion-Reference Signal
- SRS sounding reference signal
- UE-specific Reference Signal UE-specific Reference Signal
- DM-RS coherent demodulation
- CSI-RS Channel State Information-Reference Signal
- Reference signals can be classified into two types according to their purpose. There is a reference signal for the purpose of obtaining channel information and a reference signal used for data demodulation. In the former, since the UE can acquire downlink channel information, the UE needs to transmit the broadband information and must receive the RS even if the UE does not receive downlink data in a specific subframe. It is also used in situations such as handover. The latter is a reference signal sent together with the corresponding resource when the base station transmits a downlink. By demodulating the data by receiving the reference signal, the channel measurement can be performed. This reference signal should be transmitted in the area where data is transmitted.
- the newly introduced control channel is EPDCCH (Enhanced-PDCCH), and it is decided that the control channel is allocated to a data region (hereinafter, referred to as a PDSCH region) instead of an existing control region (hereinafter, referred to as a PDSCH region).
- EPDCCH Enhanced-PDCCH
- the EPDCCH can transmit control information for the node for each UE, thereby solving the problem of insufficient existing PDCCH region.
- the EPDCCH is not provided to the legacy legacy terminal, and can be received only by the LTE-A terminal.
- FIG. 5 is a diagram illustrating an EPDCCH and a PDSCH scheduled by an EPDCCH.
- an EPDCCH may generally define and use a portion of a PDSCH region for transmitting data, and a UE performs a blind decoding process for detecting the presence or absence of its own EPDCCH. Should be.
- the EPDCCH performs the same scheduling operation as the conventional PDCCH (ie PDSCH and PUSCH control), but when the number of UEs connected to the same node as the RRH increases, a larger number of EPDCCHs are allocated in the PDSCH region to perform the UE. There is a disadvantage that the complexity can be increased by increasing the number of blind decoding to do.
- FIG. 6 is a diagram illustrating a method of multiplexing multiple EPDCCHs for a UE.
- FIG. 6 shows an example in which a common PRB set is configured in units of PRB pairs and cross interleaving is performed based on this.
- FIG. 6B illustrates an example in which a common PRB set is configured only in PRB units and cross interleaving is performed based on this. do.
- This approach has the advantage of achieving diversity gain in terms of frequency / time domain over multiple RBs.
- CA carrier aggregation
- a CA is a frequency block or (logical sense) of which a terminal is composed of uplink resources (or component carriers) and / or downlink resources (or component carriers). This means that a plurality of sals are used as one large logical frequency band.
- component carrier will be unified.
- the entire system bandwidth (System Bandwidth; System BW) has a bandwidth of up to 100 MHz as a logical band.
- the entire system band includes five component carriers (CCs), and each component carrier has a maximum bandwidth of 20 MHz.
- a component carrier includes one or more contiguous subcarriers that are physically contiguous.
- each component carrier has the same bandwidth, this is only an example and each component carrier may have a different bandwidth.
- each component carrier is shown as being adjacent to each other in the frequency domain, the figure is shown in a logical concept, and each component carrier may be physically adjacent to or separated from each other.
- the center frequency may be used differently for each component carrier or may use one common common carrier for component carriers that are physically adjacent to each other. For example, assuming that all component carriers are physically adjacent to each other in FIG. 8, an enhanced carrier A may be used. In addition, assuming that the component carriers are not physically adjacent to each other, the center carrier A, the center carrier B, and the like may be used separately for each component carrier.
- a component carrier may correspond to a system band of a legacy system.
- the component carrier may be easy to provide backward support and system design in a wireless communication environment in which an advanced terminal and a legacy terminal coexist. For example, if the LTE ⁇ A system supports CA
- Each component carrier may correspond to a system band of the LTE system.
- the component carrier may have any one of 1.25, 2.5, 5, 10 or 20 ⁇ 1 ⁇ bandwidth.
- the frequency band used for communication with each terminal is defined in component carrier units.
- UE A can use 100 MHz, which is the entire system band, and performs communication using all five component carriers.
- Terminals B1 to B5 can use only 20 MHz bandwidth and communicate using one component carrier.
- Terminals C1 and C2 may use a 40 z bandwidth and communicate with each other using two component carriers.
- the two component carriers may or may not be logically / physically adjacent to each other.
- UE C1 represents a case of using two component carriers that are not adjacent to each other, and UE C2 represents a case of using two adjacent component carriers.
- a method of scheduling a data channel by the control channel may be classified into a conventional linked carrier scheduling method and a cross carrier scheduling (CCS) method.
- CCS cross carrier scheduling
- a control channel transmitted through a specific component carrier schedules only a data channel through the specific component carrier.
- a control channel transmitted through a primary component carrier (Crimary CC) using a carrier indicator field (CIF) is transmitted through the primary component carrier or through another component carrier.
- CMF carrier indicator field
- FIG. 8 is a diagram illustrating an example in which a cross carrier scheduling technique is applied.
- the number of cells (or component carriers) allocated to the UE is three, and as described above, the cross carrier scheduling scheme is performed using the CIF.
- downlink cell (or component carrier) # 0 and uplink cell (or component carrier) # 0 are each primary downlink component carrier (i.e., primary cell; PCell) and primary uplink component; It is assumed to be a carrier, and the remaining component carriers are assumed to be secondary component carriers (ie, secondary cell (SCell)).
- the present invention relates to an EPDCCH configuration, and more particularly, to a method for selecting the number of PRBs allocated to an EPDCCH and a signaling method thereof.
- the EPDCCH is designed for the purpose of improving the capacity of a control channel, and can be transmitted on a DMRS basis in an existing PDSCH region in order to obtain a beamforming gain.
- the eNB (or network) may signal an area where the EPDCCH may be transmitted to each UE. More specifically, the eNB may inform the UE of K EPDCCH sets, each EPDCCH set is composed of N PRB pairs, and different EPDCCH sets may have different N values.
- each EPDCCH set may be classified into a localized EPDCCH transmission use or a distributed EPDCCH transmission use, and each EPDCCH set may be partially or entirely overlapped with another EPDCCH set.
- N the number of PRB pairs constituting each EPDCCH set, corresponds to a bandwidth (BW) of a scheduling cell (hereinafter, referred to as PCell) of EPDCCH and a BW value of a scheduled cell (hereinafter, referred to as SCell) scheduled by EDPCCH. May be affected.
- BW bandwidth
- SCell BW value of a scheduled cell
- Nell should be set to a relatively small value. Therefore, the number of RBs that can be set for EPDCCH is limited according to the BW of the PCell.
- the SCell's BW is related to the lower limit of N allocated to EPDCCH transmission. This is because the minimum number of RBs required for transmission increases. Therefore, considering the BW of PCell and SCell in combination, N should be set to a value larger than the minimum number of RBs required for EPDCCH transmission according to the BW of SCell, and the upper limit is RB which can be allocated to EPDCCH transmission in PCell as much as possible. Is the value of the number of.
- the N value may be appropriately selected based on the BW of the PCell through which the EPDCCH is transmitted.
- This band, N1 and N2 can be a set of configurable N values, it is also possible to set the threshold in more than one step. For example, we can determine N as
- N2 (eg ⁇ 4,8 ⁇ )
- N may have a value of 2 or 4 in a BW smaller than or equal to that of T1 RBs, and may have an N of 4 or 8 in a BW over T1 RBs.
- the N value may be appropriately selected based on the BW of the SCell scheduled by the EPDCCH.
- N3 and N4 may be a set of configurable N values, and the threshold may be set in two or more steps. For example, we can determine N as
- N4 (eg ⁇ 4, 8 ⁇ )
- N has a value of 2 or 4 in a BW smaller than or equal to T2 RBs, and may have an N of 4 or 8 in a BW over T2 RBs.
- the thresholds for the PCell and the SCell may be simultaneously applied.
- the configurable N values of the PCell and the SCell may be different from each other. Therefore, in this case, the setting value of the cell having the smaller N value among the N values of the PCell and the SCell is used.
- the range of N values that can be set is determined according to the BW of the SCell, where N is limited to the range of the maximum number of RBs that can be allocated in the PCell.
- the setting range of N possible is as shown in FIG. 9.
- the SCell supports ⁇ 4, 8 ⁇
- the value of the PCell follows.
- the value of the SCell is followed.
- the UE may determine whether the threshold has been exceeded and select which of the possible N values to use.
- the threshold may be set for the available RE number / PRB pair and the like. For example ,
- [133] may be defined as follows. 10 illustrates this.
- each EPDCCH set may be configured with N PRB pairs, and the UE may acquire configuration for N PRB pairs constituting the EPCCH set through RRC signaling or the like.
- information on which P B is used as the EPDCCH among the entire PRB sets may be delivered to the UE in the following manner.
- bit map For example, if the entire downlink system bandwidth consisting of N tot of RB, using N tot bits can enjoy it indicates whether each RB is assigned EPDCCH. When the n th bit is enabled (ie, "1"), it can be seen that the n th RB has been allocated to the EPDCCH. Bits indicating RB are not necessarily mapped sequentially and may be mapped to RB to bits according to a predetermined rule. EDPCCH may be allocated to RB groups and indicated as bitmaps by forming one group of two or more RBs. have.
- FIG. 11 illustrates a case in which the entire band consists of 15 RBs for convenience of description, and ( a ) 01000 (310 (X) 010 (0, (b) lllOOOlllOOOlll (c) 000001011010110). 00 You can configure a bitmap. As shown in (b), when three Bs form a group, (b) 101 may configure a bitmap as shown in (b) 101.
- the PRB information allocated to the EPDCCH may be delivered by signaling an index of the corresponding pattern.
- a floor (system bandwidth / N) pattern may be considered in which each RB is distributed at equal intervals over the entire system band.
- the eNB may indicate the allocation using the ceil ing (log2 (number of patterns)) bit.
- a combination of an arbitrary starting PRB index and an interval not defined by the system bandwidth / N may select PRBs spaced apart from the starting PRB index for the EPDCCH.
- a cyclic shifting calculation method for the corresponding PRB pair index (or position) may be applied.
- the cyclic shift calculation method may be expressed in the form of "the total number of PRB pairs constituting the PRB pair index (or location) mod system bandwidth".
- a pattern can be constructed using a combination of an arbitrary starting PRB index and an interval not defined by the system bandwidth / N, and an arbitrary pattern can be defined and used to index each pattern.
- N i.e., the number of PRB pairs allocated to the EPDCCH
- AL high aggregation level
- One blind decoding complexity ie, the total number of blind decoding attempts is a method for improving performance while keeping it constant.
- the AL described in the above embodiment is just one example and can be set to different values through predefined rules or signals.
- the number of attempts of each BD may be set to ⁇ 6, 6, 2, 2 ⁇ .
- exception handling in the case where the number of ECCEs in the configured EPDCCH set (#of ECCE within a configured EPDCCH set) becomes smaller than a specific AL may be performed according to a direct method and an indirect method.
- the eNB may select an appropriate method to redistribute the number of candidates and then reset the UE or deliver an index for the new combination to the UE.
- the UE when an exception occurs, the UE handles the exception according to a predetermined rule. For example, if an exception between eNB-UE occurs, if the 1 method is promised, the UE does not perform BEKBlind decoding for the unsupported AL and follows the first configured for the remaining AL.
- the number of ECCEs in the configured EPDCCH set (#of ECCE within a configured EPDCCH set) becomes smaller than a specific AL, as described above, the number of ECCEs per PRB pair is not only affected by the N value. of ECCE / PRBpair) or an AL that needs to be supported.
- an example in which the number of ECCEs in a set EPDCCH set (#of ECCE within a configured EPDCCH set) is changed is a PRB pair in a specific type of subframe such as a special subframe.
- the number of ECCEs per # (# of ECCE / PRB pair) may be reduced to 1 / k of other subframes.
- the AL is changed, and as signals such as CSI-RS are allocated to the corresponding subframe,
- the number of REs per PRB pair (# of RE / PRB pair) is reduced to 1 / m, in which case the AL to be supported is increased by m times.
- # of RE / PRB pair is reduced to 1 / m, in which case the AL to be supported is increased by m times.
- AL may be set to have a different value in some cases. For example, AL may be limited to 4 or less only for localized transmission. (This is to ensure that all candidates are formed in one PRB pair.) If the case of supporting only a smaller range of AL than the preset AL combination occurs, the number of attempts of BD for each AL is generated. Can be determined by deriving from the number of attempts of a BD for a predetermined AL combination using a method such as 1, 2, or 3.
- the UE may be configured with two or more EPDCCH sets.
- blind decoding (BD) candidates may be divided for each EPDCCH set, and the number of candidates allocated for possible ALs in each EPDCCH set may be arbitrarily set by a network or determined by an implicit rule. have.
- the total number of BD candidates should be maintained at a level similar to that of legacy.
- rules applicable to the number of arbitrary configurable EPDCCH sets, transmission modes, and possible combinations of AL should be designed.
- up to two EPDCCH sets may be set, and an AL may consider a case in which each EPDCCH set supports the same ⁇ 1, 2, 4, 8 ⁇ . In this case, the number of BD candidates may be determined as follows.
- the total number of BD candidates for each AL in the entire set may be kept constant. If all ALs are not supported in a particular set, and the ALs are supported in the remaining set, they may not be supported.
- the AL may be divided into “high” and “low”, and ALs belonging to “high” may be assigned to the primary set, and ALs corresponding to "low” may be assigned to the secondary set.
- the above-described method acts as an implicit rule and can be applied when an arbitrary EPDCCH set is allocated if an AL for each EPDCCH set and a candidate number of BDs corresponding to the AL are predefined.
- the network may signal the UE by allocating the number of BD candidates for each EPDCCH set. In this case, the network may allocate the BD candidates to the AL of each set using the same method.
- the number of candidates of the BD should be able to be calculated through an implicit rule, and processing for an exception situation in which a particular AL cannot be set at the same N at least due to a change in a subframe type may be performed by using an implicit rule. Can be determined.
- An exception processing when the number of ECCEs in the set EPDCCH set becomes smaller than AL has been described above.
- Prioritizing the allocation of BD candidates to high ALs can mean securing candidates for cases in which DCI is transmitted using high ALs. That is, if there is a restriction on the configuration of a relatively high AL by the number of ECCEs constituting the EPDCCH, it is possible to have a fairness with a relatively low AL by reallocating the candidate to an AL corresponding to the lane. For example, if a high AL is needed in a bad channel environment, it may be pointless to assign additional candidates for low ALs that already have sufficient candidates.
- the table below shows a case where a BD candidate is allocated to each situation according to this principle.
- N1 and N2 represent the number of PRB pairs of EPDCCH set 1 and set 2, respectively
- BW means system bandwidth
- MinAL means the minimum AL that can be transmitted in a given subframe.
- the MinAL may be changed when the number of available REs per PRB pair is relatively small. For example, the MinAL may be changed to 2 when the number of available REs per PRB pair is less than 104. Criteria L applied in the table below is assumed as follows.
- MinAL l and DCI format 2 series with BW greater than 25 * RB o
- MinAL 2 with DCI Format 2 Series when -BW is less than or equal to 25 * RB
- criterion L l
- the reference level L is not necessarily limited to the value used in the above example, nor is it to be fixed to the value used in the table. That is, in some cases, it may be set to a value other than 1,2,4, and another L value is set for the same conditions as in the above table by further considering the transmission mode (Localized or Distribute) of EPDCCH and other EPDCCH properties. It is also possible.
- a specific threshold in a case where a setting is made through comparison with a specific threshold, a specific threshold (“less than” or “above”) does not include a specific threshold ( It will be apparent to those skilled in the art that "less than” or “greater than” expressions may or may not be interchanged with expressions that do or do not include particular thresholds.
- the reference level L may be set differently for each EPDCCH set. For example, in a scenario such as DPS, each EPDCCH set may be transmitted from different TPs.
- the following two-step method may be used to split the BD candidate for each set.
- the number of candidates for each set may be allocated differently for each set.
- One such method is to allow the number of candidates per set to be defined as a function of N and L.
- the number of available REs can be reflected by using N / L as a criterion for BD splitting.
- the number of BDs per set may be different if N is different for the same L, and L for the same N.
- the number of BDs per set may be different.
- the same number of BDs is allocated if the N / L is the same.
- the number of BD candidates for each set may be proportional to the N / L value of each set. In this case, if N / L is the same in each set, the BD candidate is divided evenly for each set.
- BD candidates will be allocated as follows.
- each set has the same number of BD candidates, and for EPDCCH set 1, ⁇ 3,3,1, 1, 0 ⁇ BD EPDCCH set 2 through the adjustment of the BD candidate assignment was assigned to ⁇ 0,3,3, 1,1 ⁇ .
- the BD candidate may be allocated as follows. At this time, the ratio of N1 / L1 to N2 / L2 (1 to 2) The number of candidate BDs for each AL is divided. If the result is not an integer, the round function is used.
- the aggregate ion level (AL) of the EPDCCH and the BD candidate for each AL may be affected by the bandwidth of the scheduling cell and the bandwidth of the scheduled cell.
- the AL may have a configuration according to the system bandwidth. For example, if the system bandwidth is above a predetermined threshold, the minimum AL is defined as 2, while below the threshold the minimum AL may be set to 1. have. Therefore, when a scheduling cell and a scheduled cell have a bandwidth in which different minimum ALs are set based on a threshold value, when CCSCcross carrier scheduling is performed, there is a problem of how to set an AL of the EPDCCH and a BD candidate for each AL. Occurs.
- a method of determining the AL of the EPDCCH and the BD candidate for each AL may be as follows.
- the number of AL and BD candidates is determined as follows for DCI format 2 / 2C.
- the number of AL and BD candidates for each AL may be calculated as a simple sum.
- the AL may be determined in consideration of both the scheduling cell and the bandwidth of the scheduled cell.
- the bandwidth of the scheduling cell and the bandwidth of the scheduled cell may be determined by appropriately combining the number of AL candidates for each CC and the number of BD candidates for each AL for each CC.
- the AL configuration finally derived through the proposed scheme and the number of BD candidates for the corresponding AL are used as input parameters of a formula defining a predefined search space (SS).
- SS predefined search space
- the scheduling cell and the SS for the cell to be scheduled may exist in a plurality of EPDCCH sets defined on the scheduling cell through a formula defining the corresponding SS.
- the equation defining SS may be defined as follows.
- L is an AL defined for a specific EPDCCH set
- the number of BD candidates for the EPDCCH set p is ⁇ ⁇ '* is the total number of ECCEs that can be derived from a specific EPDCCH set p in subframe k, and ⁇ is the specific EPDCCH set in subframe k.
- P stands for pseudo-random variable defined for p, where ⁇ is randomized by C-RNTI or / and a cue index or / and a random seed value (i.e., A) or / and an EPDCCH set index. Can be.
- i ,-, L- ⁇
- the L value of the equation defining SS and the AL configuration finally calculated through the proposed scheme and the number of BD candidates for the corresponding AL may be applied as input factors.
- a final scheduling cell for the scheduling cell and the scheduled cell to be CCS may be implemented in a plurality or one specific EPDCCH set defined on the scheduling cell.
- the proposed scheme may be applied only to a specific element or to a specific form of a specific element that may affect the AL and BD candidates allocated to each AL, such as DCI format, transmission mode, and the number of available REs. Can be. For example, only in DCI format 10900 may be applied or applied to 2 / 2C of DCI format, but not to DCI format 0 / 1A.
- DCI format 10900 may be applied or applied to 2 / 2C of DCI format, but not to DCI format 0 / 1A.
- the configuration of the BD candidates allocated using the above scheme cannot all be supported in a specific EPDCCH configuration (for example, when there are available RE numbers that cannot support a high AL)
- the method of transferring the surplus BD candidate for the proposed specific AL to another AL / other EPDDCH set may be applied as it is.
- An SS in which candidates of each CC are sequentially located may be defined as follows.
- Number of cells to be CCS) and n c! is an index value of X.
- AL L
- BD is not performed because no valid candidate actually exists at the location.
- ⁇ ⁇ that is, the CC index value may use a CIF value, but the CIF value may not be used as it is, such as when a carrier merges CCs having CIF 3 and CIF 5. I put it in CC index. Therefore, n c ! Is determined by assigning indexes that increase from 0 to 1 after sorting them according to specific criteria only for CCs used in CCS.
- the BD candidate of each AL is not CIF value. It is also possible to sort newly from zero by sorting in ascending / descending order by number.
- the position may be determined to take turns one by one (exchanging by X. For example, if AL and L have CCl and yl candidates, respectively, if CC 0 and CC 1 have xl and yl candidates.
- M X y , 2 , y3 ⁇
- the position of the candidate for each CC is defined in the above equation for each SS so that the problem of determining the position of the candidate for each CC does not occur.
- the candidate positions are different to alleviate the problem of stratification. Different offsets can be imposed on the SS. For simplicity, the CC index value and the like may be used as the offset.
- the method of determining M ⁇ is not necessarily limited to using the minimum or maximum number of candidates for each candidate in the BD candidate of each CC, and may be set by mixing the minimum and maximum values according to the purpose and purpose and according to AL. It may be possible to leave it at any other value. In this case, different offsets may be imposed on different SSs.
- the UE may perform BD for two or more DCI formats or two or more CCs.
- different numbers of BD candidates for different ALs may be allocated to each DCI format or each CC, and thus, a combination of the above proposed schemes may be applied.
- the number of REs available for TM configuration and / or bandwidth and / or CP configuration and / or specific SF configuration and / or EPDCCH transmission defined for each CC is defined in advance (eg, 104 REs) may or may not be the same.
- the SS may configure the SS by merging BD candidates defined for each CC using the proposed scheme enhancement.
- the BD candidates defined for each CC in the CCS may be determined differently according to their properties. For example, when each CC has BD candidates of the same property, the merge method A may be applied to them, and when each CC has BD candidates of different properties, the merge method B may be applied.
- BD candidates may be classified according to the purpose of using each DCI format according to the DCI format.
- a DCI format class for downlink TM ie, Class 1
- a DCI format class for fallback ie, Class 2
- a DCI format class for uplink TM ie, Class 3
- the classification method may be defined based on other predefined rules.
- the DCI format class for uplink TM may be assigned to one of the DCI format class for fallback or DCI format class for downlink TM. Rules may be defined to be included.
- DCI formats are classified into three types of classes (ie, DCI format class for fallback, DCI format class for downlink TM, and uplink TM use) Is assumed to be the DCI format class of.
- the following shows an example of DCI formats corresponding to three kinds of predefined classes.
- Class 1 DCI format 2 series, DCI format 1
- Class 2 DCI format 0 / 1A
- a ' UE may perform BD for two or more CCs and two or more DCI format classes in each CC.
- an SS in a specific AL may be configured by first merging BD candidates belonging to the same DCI format class from each CC and then merging SSs configured for each DCI format class again.
- ⁇ denotes the number of candidates allocated to the EPDCCH set p
- AL L, CC n of the corresponding DCI format class. It means.
- Equation 1 the merging method for CCs between the same DCI format classes is expressed by Equation 1 using Method A.
- ⁇ ' , 1, .., (1 + ⁇ 1) applies ⁇ , where
- the merge between different DCI format classes is shown in Fig. 13 using Method B.
- SS at AL L is configured.
- the SS in a specific AL may be defined as a merge of BD candidates belonging to several DCI format classes in a specific CC, and then merged SSs configured for each CC.
- the method of merging may also use one of the methods proposed above.
- candidates for each CC may be cross-located, which is simply configured for each DCI format class. It may be performed in units of candidate sets, and a specific method may use one of the above-described cross assignment methods. In this case, the same rule may be applied to each set or different rules may be applied.
- candidates of different CCs may collide, but may be positioned so that candidates for each CC are distributed crosswise according to the value of *. .
- the CC-specific candidates may be cross-distributed by defining an offset for each CC.
- the EPDCCH SS configuration method may include the merging method of SS between CCs proposed above. That is, when the CCS is set, the SS can be configured by merging the BD candidates of the CCs scheduled through the corresponding EDPCCH. In this case, the SS can be configured according to the transmission scheme of the EPDCCH. It defines the merge method used for localized transmission and distributed transmission separately.
- a scheme of allowing ECCEs corresponding to EPDCCH candidates of different CCs to be distributed cross over the entire SS among the above-described schemes may be applied only to local transmission and not to wide area transmission.
- the purpose of this scheme is to prevent EPDCCH candidates of a specific CC from being allocated to physically contiguous resource regions.
- not only one ECCE is formed across multiple PRBs, but also physical locations between adjacent ECCEs. This is because a combination of ECCEs indexed to be distributed or constituting the EPDCCH may be defined to be distributed.
- the merging scheme for cross-distributing ECCEs for EPDCCH candidates of different CCs has no special meaning.
- the candidates are introduced to determine the total number of candidates in a specific CC (maximum candidate).
- the method of setting to be a multiple of the number of candidates (number of CCs having a number) (the number of CCs scheduled by the corresponding EPDCCH) also applies only to local transmission and may not be applied to wide area transmission. At this time, M is defined differently for local transmission and wide area transmission.
- the value used in Equation 1 is the value of the number of CC candidates having the maximum number of EPDCCH candidates multiplied by the number of CCs, thus adding up the number of EPDCCH candidates of each CC. You may need as many null candidates as there are differences.
- the value used in Equation 1 is determined by the sum of the number of EPDCCH candidates of each CC, and ECCEs of the EPDCCH candidates of each CC are continuously located.
- Equation may be applied, or it may be possible to apply another merge method at all (merge method A, merge method B, or a sub-method).
- merge method A merge method A
- merge method B merge method B
- the proposed scheme uses the same value for local transmission as local transmission, but defines only m 'differently, or ⁇ ' ⁇ M; ii black is m ' -m + ' 'n ), and ⁇ and local transmission. The same may be used for the local transmission, and conversely, for local transmission, M ⁇ and 'value, black' defined in wide area transmission may apply to some of them.
- FIG. 15 is a block diagram illustrating components of a transmitter 10 and a receiver 20 according to embodiments of the present invention.
- the transmitter 10 and the receiver 20 are radio frequency (RF) units 13 and 23 capable of transmitting or receiving wired and / or wireless signals carrying information and / or data, signals, messages, and the like. And operatively connected with components such as a memory (12, 22), the RF unit (13, 23) and the memory (12, 22) for storing various information related to communication in a wireless communication system.
- a processor (11, 21) configured to control the memory (12, 22) and / or the F units (13, 23), respectively, to control the device to perform at least one of the embodiments of the invention described above.
- the memory 12 and 22 may store a program for processing and controlling the processor 11 and 21 and may temporarily store input / output information. Memory 12, 22 may be utilized as a buffer.
- the processors 11 and 21 typically control the overall operation of the various models in the transmitter or receiver. In particular, the processors 11 and 21 may perform various control functions for carrying out the present invention.
- Processors 11 and 21 are controllers, It can also be called a microcontroller, a microprocessor, a microcomputer, or the like.
- the processors 11 and 21 may be implemented by hardware or firmware (f innware), software, or a combination thereof.
- firmware or software may be configured to include modules, procedures, or functions for performing the functions or operations of the present invention, and are configured to perform the present invention.
- the firmware or software may be provided in the processors 11 and 21 or stored in the memories 12 and 22 to be driven by the processor 11 ⁇ 21.
- the processor (U) of the transmission device (10) is a predetermined encoding for the signal and / or data to be transmitted from the processor 11 or a scheduler connected to the processor 11 to be transmitted to the outside. And transmits to the RF unit 13 after performing modulation.
- 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 Nt transmit antennas, where Nt is a positive integer greater than or equal to one.
- the signal processing process of the receiving device 20 consists of the inverse of the signal processing process of the transmitting device 10.
- the RF unit 23 of the receiver 20 receives a radio signal transmitted by the transmitter 10.
- the RF unit 23 may include Nr ′ receive antennas, and the F unit 23 frequency down-converts each of the signals received through the receive antennas to restore the baseband signals. .
- RF unit 23 may include an oscillator for frequency downconversion.
- the processor 21 may decode and demodulate the radio signal received through the reception antenna to restore data originally intended for transmission by the transmission apparatus 10.
- the RF unit 13, 23 has one or more antennas.
- the antenna transmits a signal processed by the RF units 13 and 23 to the outside under the control of the processors 11 and 21, or receives a radio signal from the outside to receive the RF unit 13. , 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.
- the reference signal (RS) transmitted in correspondence with the corresponding antenna defines the antenna as viewed from the receiving device 20, and includes whether the channel is a single radio channel from one physical antenna or includes the antenna. Regardless of whether it is a composite channel from a plurality of physical antenna elements, the receiver 20 enables channel estimation for the antenna.
- 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.
- a channel carrying a symbol on the antenna can be derived from the channel through which another symbol on the same antenna is delivered.
- MIM0 multiple input / output
- the UE operates as the transmitter 10 in the uplink and operates as the receiver 20 in the downlink.
- the eNB operates as the receiving device 20 in the uplink, and operates as the transmitting device 10 in the downlink.
- the transmitter 10 and / or the receiver 20 may perform at least one or a combination of two or more embodiments of the present invention described above.
- the present invention can be used in a communication device such as a terminal, a relay, a base station, and the like.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020157010789A KR102201752B1 (ko) | 2012-11-28 | 2013-11-28 | 무선 통신 시스템에서 하향링크 제어 신호를 수신 또는 전송하기 위한 방법 및 이를 위한 장치 |
CN201380062244.6A CN104823395B (zh) | 2012-11-28 | 2013-11-28 | 一种用于接收或者发送下行链路控制信号的方法及其装置 |
EP13858161.6A EP2928095B1 (en) | 2012-11-28 | 2013-11-28 | Method for receiving or transmitting downlink control signal in wireless communication system, and apparatus therefor |
US14/438,577 US10530549B2 (en) | 2012-11-28 | 2013-11-28 | Method for receiving or transmitting downlink control signal in wireless communication system, and apparatus therefor |
US16/706,364 US11251922B2 (en) | 2012-11-28 | 2019-12-06 | Method for receiving or transmitting downlink control signal in wireless communication system, and apparatus therefor |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201261730954P | 2012-11-28 | 2012-11-28 | |
US61/730,954 | 2012-11-28 | ||
US201361750352P | 2013-01-08 | 2013-01-08 | |
US61/750,352 | 2013-01-08 | ||
US201361751271P | 2013-01-11 | 2013-01-11 | |
US61/751,271 | 2013-01-11 | ||
US201361753928P | 2013-01-17 | 2013-01-17 | |
US61/753,928 | 2013-01-17 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/438,577 A-371-Of-International US10530549B2 (en) | 2012-11-28 | 2013-11-28 | Method for receiving or transmitting downlink control signal in wireless communication system, and apparatus therefor |
US16/706,364 Continuation US11251922B2 (en) | 2012-11-28 | 2019-12-06 | Method for receiving or transmitting downlink control signal in wireless communication system, and apparatus therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014084625A1 true WO2014084625A1 (ko) | 2014-06-05 |
Family
ID=50828179
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2013/010900 WO2014084625A1 (ko) | 2012-11-28 | 2013-11-28 | 무선 통신 시스템에서 하향링크 제어 신호를 수신 또는 전송하기 위한 방법 및 이를 위한 장치 |
Country Status (5)
Country | Link |
---|---|
US (2) | US10530549B2 (ko) |
EP (1) | EP2928095B1 (ko) |
KR (1) | KR102201752B1 (ko) |
CN (1) | CN104823395B (ko) |
WO (1) | WO2014084625A1 (ko) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10530549B2 (en) | 2012-11-28 | 2020-01-07 | Lg Electronics Inc. | Method for receiving or transmitting downlink control signal in wireless communication system, and apparatus therefor |
CN103874096B (zh) * | 2012-12-18 | 2017-12-26 | 中兴通讯股份有限公司 | 一种下行控制信息的发送和检测方法、发送端和接收端 |
US9185716B2 (en) * | 2013-01-03 | 2015-11-10 | Samsung Electronics Co., Ltd. | Obtaining control channel elements of physical downlink control channels for cross-carrier scheduling |
JP6328843B2 (ja) | 2014-07-18 | 2018-05-23 | エルジー エレクトロニクス インコーポレイティド | 無線通信システムにおけるアップリンクデータの送信方法及びこのための装置 |
CN109586887B (zh) | 2015-01-26 | 2020-07-07 | 华为技术有限公司 | 用于传送正交频分复用(ofdm)帧格式的系统和方法 |
US10652768B2 (en) * | 2015-04-20 | 2020-05-12 | Qualcomm Incorporated | Control channel based broadcast messaging |
CN106714308B (zh) * | 2015-08-11 | 2019-12-27 | 上海诺基亚贝尔股份有限公司 | 一种无线通信方法和设备 |
WO2017063177A1 (zh) * | 2015-10-15 | 2017-04-20 | 华为技术有限公司 | 一种信号确定方法及装置 |
CN114466456A (zh) * | 2016-09-29 | 2022-05-10 | 华为技术有限公司 | 下行控制信道的传输方法、接收网元及发送网元 |
KR20180107686A (ko) * | 2017-03-22 | 2018-10-02 | 삼성전자주식회사 | 무선 셀룰라 통신 시스템에서 상향 제어 채널 전송 방법 및 장치 |
WO2018202893A1 (en) | 2017-05-05 | 2018-11-08 | Telefonaktiebolaget Lm Ericsson (Publ) | Search space and configuration for short transmission time interval |
US10587386B2 (en) * | 2018-01-12 | 2020-03-10 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiplexing of periodic channel state information on physical uplink shared channel together with hybrid automatic repeat request acknowledgement |
US10827516B2 (en) * | 2018-01-19 | 2020-11-03 | Qualcomm Incorporated | Resource splitting among different types of control information and uplink data for a transmission on an uplink shared channel |
CN110662228B (zh) * | 2018-06-29 | 2021-02-12 | 维沃移动通信有限公司 | 跨载波调度的pdcch候选分配方法、设备和存储介质 |
US11070951B2 (en) * | 2019-02-15 | 2021-07-20 | Huawei Technologies Co., Ltd. | Systems and methods for multicast resource allocation |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2283488A4 (en) * | 2008-05-08 | 2017-04-26 | L-3 Communications Security and Detection Systems, Inc. | Adaptive scanning in an imaging system |
CN102065543B (zh) * | 2009-11-16 | 2014-01-01 | 中兴通讯股份有限公司 | 控制信道单元的分配方法及装置 |
US20110267948A1 (en) * | 2010-05-03 | 2011-11-03 | Koc Ali T | Techniques for communicating and managing congestion in a wireless network |
US20120054258A1 (en) * | 2010-08-27 | 2012-03-01 | Futurewei Technologies, Inc. | System and Method for Transmitting a Control Channel |
US20120264468A1 (en) * | 2011-04-12 | 2012-10-18 | Renesas Mobile Corporation | Sensing configuration in carrier aggregation scenarios |
CN102164416B (zh) * | 2011-05-03 | 2014-04-16 | 电信科学技术研究院 | 一种数据传输的方法、系统和设备 |
CN102573094B (zh) | 2012-01-17 | 2015-04-08 | 电信科学技术研究院 | 一种传输dci的方法及装置 |
US9054843B2 (en) * | 2012-01-30 | 2015-06-09 | Nokia Solutions And Networks Oy | Search space arrangement for control channel |
KR102096927B1 (ko) * | 2012-09-04 | 2020-04-06 | 삼성전자주식회사 | 제어 채널 엘리먼트들에 대한 어그리게이션 레벨들 개수 조정 장치 및 방법 |
US10530549B2 (en) | 2012-11-28 | 2020-01-07 | Lg Electronics Inc. | Method for receiving or transmitting downlink control signal in wireless communication system, and apparatus therefor |
GB2511765B (en) * | 2013-03-12 | 2015-03-18 | Stirling Moulded Composites Ltd | A method of manufacturing a padded part primarily for an item of wear |
-
2013
- 2013-11-28 US US14/438,577 patent/US10530549B2/en active Active
- 2013-11-28 CN CN201380062244.6A patent/CN104823395B/zh active Active
- 2013-11-28 KR KR1020157010789A patent/KR102201752B1/ko active IP Right Grant
- 2013-11-28 EP EP13858161.6A patent/EP2928095B1/en active Active
- 2013-11-28 WO PCT/KR2013/010900 patent/WO2014084625A1/ko active Application Filing
-
2019
- 2019-12-06 US US16/706,364 patent/US11251922B2/en active Active
Non-Patent Citations (6)
Title |
---|
ALCATEL -LUCENT ET AL.: "Remaining Details of Search Space and Aggregation Levels", 3GPP TSG RAN WG1 MEETING #70BIS, R1-124418, 8 October 2012 (2012-10-08), SAN DIEGO, XP050662310 * |
HTC: "Remaining Details of Search Space and Aggregation Levels of EPDCCH", 3GPP TSG RAN WG1 MEETING #71, R1-124959, 12 November 2012 (2012-11-12), NEW ORLEANS, USA, XP050662878 * |
NOKIA: "Remaining details on search spaces ofEPDCCH", 3GPP TSG RAN WG1 MEETING #70BIS, R1-124184, 8 October 2012 (2012-10-08), SAN DIEGO, XP055263454 * |
PANASONIC: "EPDCCH search space and aggregation levels", 3GPP TSG RAN WG1 MEETING #70BIS, R1-124241, 8 October 2012 (2012-10-08), SAN DIEGO, XP055263453 * |
PANASONIC: "EPDCCH search space and aggregation levels", 3GPP TSG RAN WG1 MEETING #70BIS, R1-124555, 8 October 2012 (2012-10-08), SAN DIEGO, XP055263456 * |
See also references of EP2928095A4 * |
Also Published As
Publication number | Publication date |
---|---|
US20200112412A1 (en) | 2020-04-09 |
US11251922B2 (en) | 2022-02-15 |
US20150295689A1 (en) | 2015-10-15 |
EP2928095A4 (en) | 2016-09-14 |
EP2928095A1 (en) | 2015-10-07 |
CN104823395B (zh) | 2018-11-02 |
KR20150090047A (ko) | 2015-08-05 |
US10530549B2 (en) | 2020-01-07 |
KR102201752B1 (ko) | 2021-01-12 |
CN104823395A (zh) | 2015-08-05 |
EP2928095B1 (en) | 2019-03-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9955474B2 (en) | Method and device for receiving or transmitting downlink control signal in wireless communication system | |
US11251922B2 (en) | Method for receiving or transmitting downlink control signal in wireless communication system, and apparatus therefor | |
US10009917B2 (en) | Method for multi-subframe scheduling and apparatus for the same | |
KR102196316B1 (ko) | 무선 통신 시스템에서 하향링크 제어 신호를 수신 또는 전송하기 위한 방법 및 이를 위한 장치 | |
KR102057864B1 (ko) | 무선 통신 시스템에서 데이터 송수신 방법 및 이를 위한 장치 | |
KR102221297B1 (ko) | 장치 대 장치 통신에서 신호 전송 방법 및 이를 위한 장치 | |
US10637629B2 (en) | Method and apparatus for transmitting uplink signal in wireless communication system | |
US10237890B2 (en) | Method for sensing unlicensed band and device therefor | |
WO2014107001A1 (ko) | 무선 통신 시스템에서 간섭을 측정하기 위한 방법 및 이를 위한 장치 | |
US20170359827A1 (en) | Method for interference control in radio resource and device therefor | |
US9313005B2 (en) | Method and user equipment for transmitting channel state information and method and base station for receiving channel state information | |
WO2013157772A1 (ko) | 상향링크 자원 결정 방법 및 이를 이용한 상향링크 제어 신호 전송 방법, 그리고 이들을 위한 장치 | |
WO2014119865A1 (ko) | 무선 통신 시스템에서 하향링크 제어 신호를 수신 또는 전송하기 위한 방법 및 이를 위한 장치 | |
US9331831B2 (en) | Method for receiving or transmitting downlink signals and apparatus therefor | |
KR102063080B1 (ko) | 무선 통신 시스템에서 간섭 제어 방법 및 이를 위한 장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13858161 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20157010789 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14438577 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: IDP00201502767 Country of ref document: ID |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2013858161 Country of ref document: EP |