WO2014193068A1 - 하향링크 데이터를 디코딩하는 방법 및 장치 - Google Patents
하향링크 데이터를 디코딩하는 방법 및 장치 Download PDFInfo
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- WO2014193068A1 WO2014193068A1 PCT/KR2014/001418 KR2014001418W WO2014193068A1 WO 2014193068 A1 WO2014193068 A1 WO 2014193068A1 KR 2014001418 W KR2014001418 W KR 2014001418W WO 2014193068 A1 WO2014193068 A1 WO 2014193068A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and apparatus for decoding downlink data.
- LTE Long term evolution
- 3GPP 3rd Generation Partnership Project
- TS Technical Specification
- the physical channel in LTE is a downlink channel PDSCH (Physical Downlink) It may be divided into a shared channel (PDCCH), a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) which are uplink channels.
- PDSCH Physical Downlink
- PUSCH physical uplink shared channel
- PUCCH physical uplink control channel
- PUCCH is an uplink control channel used for transmission of uplink control information such as a hybrid automatic repeat request (HARQ) ACK / NACK signal, a channel quality indicator (CQI), and a scheduling request (SR).
- uplink control information such as a hybrid automatic repeat request (HARQ) ACK / NACK signal, a channel quality indicator (CQI), and a scheduling request (SR).
- HARQ hybrid automatic repeat request
- CQI channel quality indicator
- SR scheduling request
- 3GPP LTE-A (advanced) is an evolution of 3GPP LTE.
- the technologies introduced in 3GPP LTE-A include carrier aggregation and multiple input multiple output (MIMO) supporting four or more antenna ports.
- MIMO multiple input multiple output
- Carrier aggregation uses a plurality of component carriers.
- Component carriers are defined by center frequency and bandwidth.
- One downlink component carrier or a pair of an uplink component carrier and a downlink component carrier corresponds to one cell.
- a terminal receiving a service using a plurality of downlink component carriers may be said to receive a service from a plurality of serving cells.
- TDD time division duplex
- one or more downlink subframes are associated with an uplink subframe.
- 'Connection' means that transmission / reception in a downlink subframe is connected with transmission / reception in an uplink subframe. For example, when receiving a transport block in a plurality of downlink subframes, the terminal transmits HARQ ACK / NACK for the transport block in an uplink subframe connected to the plurality of downlink subframes.
- Another object of the present invention is to provide a terminal for decoding data on a downlink subframe.
- a method of decoding data on a downlink subframe the terminal receiving downlink data on a data subframe transmitted from a first serving cell.
- the terminal receives configuration information regarding a plurality of PRS subframes for transmitting the PRS, wherein the plurality of PRS subframes are transmitted from a second serving cell and the PDSCH on the data subframe according to the configuration information
- the method may include determining whether to decode data transmitted through a physical downlink shared channel (EPDCH) and an enhanced physical control channel (EPDCCH), wherein a first cyclic prefix (CP) length of the data subframe is equal to the data subframe.
- EPDCH physical downlink shared channel
- EPDCCH enhanced physical control channel
- the transmitted data may be decoded by the terminal, and the data subframe may overlap with at least one PRS subframe of the plurality of PRS subframes.
- the terminal In a terminal for decoding data on a downlink subframe according to an aspect of the present invention for achieving another object of the present invention, the terminal, the radio frequency (RF) for receiving data on the downlink subframe
- RF radio frequency
- a plurality of PRS subframes including a processor and a processor selectively connected to the RF unit, including the processor, receiving downlink data on a data subframe transmitted on a first serving cell, and transmitting a PRS.
- Receive configuration information wherein the plurality of PRS subframes are transmitted on a second serving cell, and are transmitted through a physical downlink shared channel (PDSCH) and an enhanced physical downlink control channel (EPDCCH) on the data subframe according to the configuration information.
- PDSCH physical downlink shared channel
- EPDCCH enhanced physical downlink control channel
- the data subframe It may overlap with at least one PRS subframe among the plurality of PRS subframes.
- a positioning reference signal PRS
- intra-band continuous carrier aggregation is performed.
- a subframe to decode a physical downlink shared channel (PDSCH) may be determined among subframes transmitted from other cells. Accordingly, the UE may selectively perform decoding on a decodeable PDSCH.
- PRS positioning reference signal
- PDSCH physical downlink shared channel
- 1 shows a structure of a radio frame in LTE.
- FIG. 2 shows an example of a resource grid for a downlink slot.
- 3 shows a structure of a downlink subframe.
- FIG. 4 shows a structure of a downlink radio frame in TDD mode in 3GPP LTE.
- 5 shows a structure of an uplink subframe in 3GPP LTE.
- FIG. 6 is an exemplary diagram illustrating monitoring of a PDCCH.
- FIG. 7 shows a downlink subframe to which a reference signal and a control channel of 3GPP LTE are allocated.
- FIG. 9 is a conceptual diagram illustrating a structure of a multimedia broadcast single frequency network (MBSFN) subframe.
- MMSFN multimedia broadcast single frequency network
- 10 is a conceptual diagram illustrating a P-cell and an S-cell.
- FIG. 11 is a conceptual diagram illustrating a protocol for supporting a multimedia broadcast multicast service (MBMS).
- MBMS multimedia broadcast multicast service
- FIG. 12 is a conceptual diagram illustrating an operation between a terminal and a location information server.
- FIG. 13 is a conceptual diagram illustrating a positioning reference signal (PRS).
- PRS positioning reference signal
- FIG. 14 is a conceptual diagram illustrating a method of transmitting a PRS subframe according to an embodiment of the present invention.
- FIG. 15 is a conceptual diagram illustrating a method of decoding a subframe by a terminal according to a timing advanced group (TAG) configuration of a base station according to an embodiment of the present invention.
- TAG timing advanced group
- 16 is a conceptual diagram illustrating a method for transmitting a PRS subframe in a cell on which carrier aggregation is performed according to an embodiment of the present invention.
- 17 is a block diagram showing a wireless communication system according to an embodiment of the present invention.
- the user equipment may be fixed or mobile, and may include a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a personal digital assistant (PDA). It may be called other terms such as digital assistant, wireless modem, handheld device.
- MS mobile station
- MT mobile terminal
- UT user terminal
- SS subscriber station
- PDA personal digital assistant
- a base station generally refers to a fixed station communicating with a terminal, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.
- eNB evolved-NodeB
- BTS base transceiver system
- access point an access point
- 1 shows a structure of a radio frame in LTE.
- the structure of the radio frame 100 in 3GPP LTE is 3GPP TS 36.211 V8.2.0 (2008-03) "Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 8)" Is disclosed in Section 5.
- the radio frame 100 includes ten subframes 120.
- One subframe 120 is composed of two slots 140.
- the radio frame 100 may be indexed based on the slot 140 from the slot # 0 to the slot # 19 or may be indexed based on the subframe from the subframe # 0 to the subframe # 9 according to the subframe 120.
- subframe # 0 may include slot # 0 and slot # 1.
- the time taken for one subframe 120 to be transmitted is called a transmission time interval (TTI).
- TTI may be a scheduling unit for data transmission.
- one radio frame 100 may have a length of 10 ms
- one subframe 120 may have a length of 1 ms
- one slot 140 may have a length of 0.5 ms.
- One slot 140 includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of subcarriers in the frequency domain.
- OFDM orthogonal frequency division multiplexing
- a base station uses OFDMA as an access method in a downlink channel.
- the OFDM symbol is for representing one symbol period and may be called a different name according to a multiple access scheme.
- SC-FDMA single carrier-frequency division multiple access
- the symbol period for transmitting data through the uplink channel may be referred to as an SC-FDMA symbol.
- the structure of the radio frame 100 disclosed in FIG. 1 is one embodiment of a frame structure. Therefore, the new radio is changed by varying the number of subframes 120 included in the radio frame 100, the number of slots 140 included in the subframe 120, or the number of OFDM symbols included in the slot 140. Can be defined in a frame format.
- the number of symbols including one slot may vary depending on which cyclic prefix (CP) is used. For example, if a radio frame uses a normal CP, one slot may include seven OFDM symbols. When a radio frame uses an extended CP, one slot may include six OFDM symbols.
- CP cyclic prefix
- the wireless communication system may use a frequency division duplex (FDD) method and a time division duplex (TDD) method as a duplexing method.
- FDD frequency division duplex
- TDD time division duplex
- uplink transmission and downlink transmission may be performed based on different frequency bands.
- uplink transmission and downlink transmission may be performed using a time-based partitioning scheme based on the same frequency band.
- the channel response of the TDD scheme may have a reciprocal nature by using the same frequency band. That is, in the TDD scheme, the downlink channel response and the uplink channel response may be substantially the same in a given frequency domain. Accordingly, the TDD-based wireless communication system may obtain channel state information of the downlink channel from channel state information of the uplink channel.
- the TDD method since the entire frequency band is time-divided into uplink transmission and downlink transmission, downlink transmission by the base station and uplink transmission by the terminal cannot be performed at the same time.
- FIG. 2 shows an example of a resource grid for a downlink slot.
- the downlink slot includes a plurality of OFDM symbols in the time domain and NRB resource blocks in the frequency domain.
- the NRB which is the number of resource blocks included in the downlink slot, may be determined according to the downlink transmission bandwidth set in the cell. For example, in the LTE system, the NRB may be any one of 6 to 110 depending on the transmission bandwidth used.
- One resource block 200 may include a plurality of subcarriers in a frequency domain.
- the structure of the uplink slot may also be the same as the structure of the downlink slot.
- Each element on the resource grid is called a resource element 220.
- the resource element 220 on the resource grid may be identified by (k, l), which is an index pair.
- one resource block 200 may include 7 ⁇ 12 resource elements 220 including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain.
- the size may vary in the number of OFDM symbols and the number of subcarriers constituting one resource block 200.
- a resource block pair indicates a resource unit including two resource blocks.
- the number of OFDM symbols included in one slot may have a different value according to CP as described above.
- the number of resource blocks included in one slot may vary according to the size of the entire frequency bandwidth.
- 3 shows a structure of a downlink subframe.
- the downlink subframe 300 may be divided into two slots 310 and 320 based on time.
- Each slot 310, 320 includes seven OFDM symbols in a normal CP.
- the resource region corresponding to three OFDM symbols (up to 4 OFDM symbols for 1.4Mhz bandwidth) in time included in the first slot 310 of the subframe 300 is a control region to which control channels are allocated. region, 350).
- the remaining OFDM symbols may be used as the data region 360 to which a traffic channel such as a physical downlink shared channel (PDSCH) is allocated.
- PDSCH physical downlink shared channel
- the PDCCH is, for example, resource allocation and transmission format of the downlink-shared channel (DL-SCH), resource allocation information of the uplink shared channel (UL-SCH), paging information on the PCH, system information on the DL-SCH, on the PDSCH It is a control channel that transmits resource allocation for higher layer control messages such as random access responses transmitted, a set of transmit power control commands for individual UEs in any UE group, and activation information of voice over internet protocol (VoIP). Can be.
- a plurality of units for transmitting the PDCCH data may be defined in the control region 350.
- the UE may acquire control data by monitoring a plurality of units for transmitting PDCCH data.
- PDCCH data may be transmitted to the terminal based on aggregation of one or several consecutive control channel elements (CCEs).
- the CCE may be one unit for transmitting PDCCH data.
- the CCE may include a plurality of resource element groups.
- a resource element group is a resource unit that contains four available resource elements.
- the base station determines the PDCCH format according to downlink control information (DCI) to be sent to the terminal, and attaches a cyclic redundancy check (CRC) to the control information.
- DCI downlink control information
- CRC cyclic redundancy check
- RNTI unique radio network temporary identifier
- RNTI a unique radio network temporary identifier of the terminal, for example, a cell-RNTI (C-RNTI) may be masked to the CRC.
- C-RNTI cell-RNTI
- a paging indication identifier for example, p-RNTI (P-RNTI) may be masked to the CRC.
- SI-RNTI system information-RNTI
- RA-RNTI random access-RNTI
- FIG. 4 shows a structure of a downlink radio frame in TDD mode in 3GPP LTE.
- E-UTRA Evolved Universal Terrestrial Radio Access
- Physical Channels and Modulation RFD
- TDD time division duplex
- a subframe having indexes # 1 and # 6 is called a special subframe and includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
- DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
- GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- DL subframe In TDD, a downlink (DL) subframe and an uplink (UL) subframe coexist in one radio frame.
- Table 1 shows an example of configuration of a radio frame.
- 'D' represents a DL subframe
- 'U' represents a UL subframe
- 'S' represents a special subframe.
- the terminal may know which subframe is the DL subframe or the UL subframe according to the configuration of the radio frame.
- the PCFICH transmitted in the first OFDM symbol of a subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
- CFI control format indicator
- the terminal first receives the CFI on the PCFICH, and then monitors the PDCCH.
- 5 shows a structure of an uplink subframe in 3GPP LTE.
- the uplink subframe may be divided into a region in which a physical uplink control channel (PUCCH) carrying uplink control information is allocated in a frequency domain and a data region in which a physical uplink shared channel (PUSCH) carrying user data is allocated.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- Resource allocation for the PUCCH may be located at the edge of the bandwidth of the component carrier (CC).
- PUCCH may be allocated based on an RB pair in a subframe. RBs belonging to the RB pair may be allocated to different subcarriers in each of the first slot and the second slot.
- m is a position index indicating a logical frequency domain position of an RB pair allocated to a PUCCH in a subframe. It can be seen that RBs having the same m value are allocated to different subcarriers of the first slot and the second slot.
- PUCCH may have various formats. According to a modulation scheme used in the PUCCH format, PUCCHs of different formats having different numbers of bits in a subframe may be used.
- Table 2 shows an example of a modulation scheme and the number of bits per subframe according to the PUCCH format.
- PUCCH format 1 is used for transmission of SR (Scheduling Request)
- PUCCH format 1a / 1b is used for transmission of ACK / NACK signal for HARQ
- PUCCH format 2 is used for transmission of CQI
- PUCCH format 2a / 2b is used for CQI and Used for simultaneous transmission of ACK / NACK signals.
- PUCCH format 1a / 1b is used when transmitting only the ACK / NACK signal in the subframe
- PUCCH format 1 is used when the SR is transmitted alone.
- PUCCH format 1 is used, and an ACK / NACK signal is modulated and transmitted on a resource allocated to the SR.
- All PUCCH formats use a cyclic shift (CS) of a sequence in each OFDM symbol.
- the cyclically shifted sequence is generated by cyclically shifting the base sequence by a specific cyclic shift amount.
- the specific CS amount is indicated by the cyclic shift index (CS index).
- the length of the sequence is equal to the number of elements included in the sequence.
- a sequence index for indicating a sequence may be determined based on a cell identifier, a slot number in a radio frame, and the like. Assuming that the base sequence is mapped to one resource block in the frequency domain, the length N of the base sequence is 12 since one resource block includes 12 subcarriers.
- the cyclically shifted sequence can be generated by cyclically shifting the base sequence.
- the available cyclic shift index of the base sequence may be derived from the base sequence according to the CS interval. For example, if the length of the base sequence is 12 and the CS interval is 1, the total number of available cyclic shift indices of the base sequence is 12. Alternatively, if the length of the base sequence is 12 and the CS interval is 2, the total number of available cyclic shift indices of the base sequence is six. Now, transmission of HARQ ACK / NACK signal in PUCCH format 1b is described.
- FIG. 6 is an exemplary diagram illustrating monitoring of a PDCCH.
- the UE may perform blind decoding to detect the PDCCH.
- Blind decoding is a method of determining whether a corresponding PDCCH is its control channel by checking a CRC error after demasking a CRC of received PDCCH (this is called a PDCCH candidate) based on a specific identifier.
- the UE does not know where its PDCCH data is transmitted in the control region, what CCE aggregation level and DCI format are used.
- a plurality of PDCCHs may be transmitted in one subframe.
- the UE monitors the plurality of PDCCHs in every subframe.
- monitoring means that the UE attempts blind decoding on the PDCCH.
- a search space is used to reduce the burden caused by the UE performing blind decoding.
- the search region may be referred to as a monitoring set of CCE for searching a PDCCH.
- the UE may monitor the PDCCH based on the search area.
- the search area is divided into a common search space and a UE-specific search space.
- the common search area is a space for searching for a PDCCH having common control information.
- the common search area includes 16 CCEs up to CCE indexes 0 to 15, and supports a PDCCH having a CCE aggregation level of ⁇ 4, 8 ⁇ .
- PDCCH data (DCI formats 0 and 1A) carrying UE specific information may also be transmitted in the common search area.
- the UE specific discovery region supports a PDCCH having a CCE aggregation level of ⁇ 1, 2, 4, 8 ⁇ .
- Table 11 shows the number of PDCCH candidates monitored by the UE.
- the size of the search area is determined by Table 11, and the starting point of the search area is defined differently in the common search area and the terminal specific search area.
- the starting point of the common search area is fixed regardless of the subframe, but the starting point of the UE-specific search area is determined for each subframe according to the terminal identifier (eg, C-RNTI), the CCE aggregation level, and / or the slot number in the radio frame. Can vary.
- the terminal specific search area and the common search area may overlap.
- the set of PDCCH candidates monitored by the UE may be defined based on the search region.
- Navigation area at aggregation level 1, 2, 4, or 8 Is defined as a set of PDCCH candidates.
- Navigation area The CCE corresponding to the PDCCH candidate m is given by Equation 1 below.
- i 0,... L-1.
- m ' m.
- NCI carrier indicator field
- the variable Yk in the UE-specific search region of the aggregation level L is defined as in Equation 2 below.
- ns is a slot number within a radio frame.
- a DCI format and a search space to be monitored are determined according to a transmission mode of the PDSCH.
- Table 4 below shows an example of PDCCH monitoring configured with C-RNTI.
- the uses of the DCI format are classified as shown in the following table.
- the DCI format and the search region used may be differently determined according to the RNTI masked to the CRC used when generating the DCI.
- Table 6 shows a search region and a DCI format of a control channel used when SI-RNTI, P-RNTI, or RA-RNTI is masked in a CRC of DCI.
- Table 7 shows a search region and a DCI format of a control channel used when the SPS-C-RNT is masked in the CRC of the DCI.
- Table 8 shows a search region and a DCI format of a control channel used when a temporal C-RNTI is masked in a CRC of the DCI.
- FIG. 7 shows a downlink subframe to which a reference signal and a control channel of 3GPP LTE are allocated.
- the downlink subframe may be divided into a control region and a data region.
- the downlink subframe includes three OFDM symbols in the control region (or PDCCH region), and the data region in which the PDSCH is transmitted includes the remaining OFDM symbols.
- PCFICH, PHICH and / or PDCCH are transmitted in the control region.
- a physical HARQ ACK / NACK indicator channel may transmit hybrid automatic retransmission request (HARQ) information in response to uplink transmission.
- HARQ hybrid automatic retransmission request
- the physical control format indicator channel may transmit information on the number of OFDM symbols allocated to the PDCCH.
- a control format indicator (CFI) of the PCFICH may indicate three OFDM symbols.
- the region excluding the resource for transmitting the PCFICH and / or PHICH becomes the PDCCH region where the UE monitors the PDCCH.
- Various reference signals may also be transmitted in the subframe.
- the cell-specific reference signal is a reference signal that can be received by all terminals in a cell and can be transmitted over all downlink frequency bands.
- 'R0' is a RE in which a CRS is transmitted for a first antenna port
- 'R1' is a RE in which a CRS is transmitted in a second antenna port
- 'R2' is a RE in which a CRS is transmitted in a third antenna port.
- 'R3' indicates the RE to which the CRS for the fourth antenna port is transmitted.
- RS sequence rl, ns (m) for CRS is defined as follows.
- ns is a slot number in a radio frame
- l is an OFDM symbol index in a slot.
- the pseudo-random sequence c (i) is defined by a Gold sequence of length 31 as follows.
- Nc 1600
- the second m-sequence is at the beginning of each OFDM symbol Is initialized to Is the physical cell identifier (PCI) of the cell.
- a UE-specific reference signal may be transmitted in the subframe.
- the CRS is transmitted in the entire region of the subframe, but the URS is transmitted in the data region of the subframe and is a reference signal used for demodulation of the PDSCH.
- 'R5' indicates the RE to which the URS is transmitted.
- DM-RS is a reference signal used for demodulating EPDCCH data.
- the URS may be transmitted in an RB to which corresponding PDSCH data is resource mapped.
- R5 is displayed in addition to the region in which PDSCH data is transmitted. However, this is to indicate the location of the RE to which the URS is mapped.
- the URS may be a reference signal demodulated only by a specific terminal.
- RS sequence rl, ns (m) for the URS is the same as the equation (3).
- the pseudo random sequence generator is generated at the beginning of each subframe. Is initialized to nRNTI is an identifier of a wireless device.
- the above-described initialization method is a case where the URS is transmitted through a single antenna, and when the URS is transmitted through multiple antennas, the pseudo random sequence generator generates at the start of each subframe.
- Is initialized to nSCID is a parameter obtained from a DL grant (eg, DCI format 2B or 2C) associated with PDSCH transmission.
- the URS supports MIMO (Multiple Input Multiple Ouput) transmission.
- the RS sequence for the URS may be spread in the following spreading sequence.
- a layer may be defined as an information path input to a precoder.
- the rank is the number of non-zero eigenvalues of the MIMO channel matrix, which is equal to the number of layers or the number of spatial streams.
- the layer may correspond to an antenna port for distinguishing a URS and / or a spreading sequence applied to the URS.
- the PDCCH is monitored in a limited region called a control region in a subframe, and the CRS transmitted in all bands is used for demodulation of the PDCCH.
- the types of control data are diversified and the amount of control data is increased, scheduling flexibility is inferior only with the existing PDCCH.
- EPDCCH enhanced PDCCH
- the subframe may include zero or one PDCCH region 810 and zero or more EPDCCH regions 820 and 830.
- the EPDCCH regions 820 and 830 are regions where the UE monitors the EPDCCH.
- the PDCCH region 810 is located within the preceding three or at most four OFDM symbols of the subframe, but the EPDCCH regions 820 and 830 may be flexibly scheduled in the OFDM symbols after the PDCCH region 810.
- One or more EPDCCH regions 820 and 830 are designated to the terminal, and the terminal may monitor EPDCCH data in the designated EPDCCH regions 820 and 830.
- RRC radio resource control
- the PDCCH may be demodulated based on the CRS.
- DM-RSs not CRSs, may be defined for demodulation of the EPDCCH.
- the DM-RS may be transmitted in the corresponding EPDCCH regions 820 and 830.
- RS sequence for DM-RS is the same as Equation 3.
- Pseudo Random Sequence Generator is used at the beginning of each subframe Can be initialized to ns is the slot number in the radio frame, Is the cell index associated with the corresponding EPDCCH region, Is a parameter given from higher layer signaling.
- Each EPDCCH region 820, 830 may be used for scheduling for different cells.
- the EPDCCH in the EPDCCH region 820 may carry scheduling information for the primary cell
- the EPDCCH in the EPDCCH region 1530 may carry scheduling information for the secondary cell.
- the same precoding as that of the EPDCCH may be applied to the DM-RS in the EPDCCH regions 820 and 830.
- the transmission resource unit for the EPDCCH is referred to as an Enhanced Control Channel Element (ECCE).
- ECCE Enhanced Control Channel Element
- a search region may also be defined in the EPDCCH region. The UE may monitor the EPDCCH candidate based on the aggregation level.
- FIG. 9 is a conceptual diagram illustrating a structure of a multimedia broadcast single frequency network (MBSFN) subframe.
- MMSFN multimedia broadcast single frequency network
- ten subframes included in one frame 910 are MBSFNs that can be used for broadcast or multicast with a general subframe 950 used for transmission and reception of general data. It may include a subframe 970.
- the general subframe 950 and the MBSFN subframe 970 may have a difference in the number of OFDM symbols, the length of CP, and the structure and number of CRSs.
- the MBSFN subframe 970 has been used only for the purpose of transmitting broadcast or multicast data.
- the MBSFN subframe 970 can be used not only for the purpose of broadcasting or multicast but also for unicast purpose of data transmission for a specific terminal.
- the MBSFN subframe is a subframe for transmitting a physical multicast channel (PMCH) and indicates a subframe in which the CRS may not be transmitted in the remaining region other than the PDCCH region composed of the first two OFDM symbols. can do.
- the PDCCH region may also be defined by one OFDM symbol.
- MBSFN configuration information is information for configuring an MBSFN subframe transmitted by a base station.
- MBSFN configuration information may be transmitted through a higher layer signal.
- the base station may transmit MBSFN configuration information through system information block (SIB) -2 transmitted through PDSCH.
- SIB system information block
- the MBSFN configuration information may include information such as a bitmap indicating a MBSFN subframe, a radio frame allocation period, a radio frame allocation offset, a subframe allocation, and the like.
- the number of CRSs mapped in the resource block of the MBSFN subframe and the number of CRSs included in the resource block of the normal subframe may have different values.
- the number of first CRSs mapped to the MBSFN subframe may be smaller than the number of second CRSs mapped to the normal subframe.
- the first CRS is Generated based on a reference signal sequence determined by a pseudo random sequence initialized to Is the slot number of the MBSFN subframe, Is an identifier of the first serving cell, May be determined based on the CP length of the OFDM symbol of the slot of the MBSFN subframe.
- the second CRS is Generated based on a reference signal sequence determined by a pseudo random sequence initialized to Is the slot number of the normal subframe, Is an identifier of the first serving cell, May be determined based on the CP length of the OFDM symbol of the slot of the normal subframe.
- 10 is a conceptual diagram illustrating a P-cell and an S-cell.
- P-cells and S-cells may be implemented in a variety of ways.
- the P-cell and the S-cell may indicate a cell in which the center frequency is different from each other.
- a base station may perform carrier aggregation based on a primary component carrier (PCC) and at least one secondary component carrier (SCC). If two or more cells exist, the base station may determine one cell as the P-cell 1000 and the other cell as the S-cell 1020. The base station aggregates the determined CC (carrier component) of the P-cell 1000 and the S-cell 1020, and transmits data to the terminal using the aggregated frequency bandwidth. The terminal may also transmit data to the base station using the aggregated frequency bandwidth.
- the P-cell 1000 and the S-cell 1020 disclosed in FIG. 10 are PCCs of the P-cell 1000 as an exemplary form of a scenario in which the P-cell 1000 and the S-cell 1020 are disposed. This is a case where the transmission range of data transmitted based on is greater than the transmission range of data transmitted based on the SCC of the S-cell 1020.
- the terminal may perform radio resource control (RRC) connection through the PCC of the P-cell 1000.
- RRC radio resource control
- the terminal may attempt random access to the base station through a physical random access channel (PRACH) based on the signal signaled through the PCC. That is, the terminal may perform an initial connection establishment process or a connection re-establishment process to the base station through the PCC in the carrier aggregation environment.
- PRACH physical random access channel
- the SCC of the S-cell 1020 may be used to provide additional radio resources.
- the UE In order to perform carrier aggregation for adding the SCC to the PCC, the UE needs to perform neighbor cell measurement for obtaining information about the neighbor cell. Based on the neighbor cell measurement performed by the UE, the base station may determine whether to aggregate the SCC to the PCC.
- the base station may transmit the PDCCH data to the terminal through the PCC.
- the PDCCH data may include allocation information for PDSCH data transmitted through a downlink PCC band and an SCC band and information for approving data transmission through uplink.
- the P-cell 1000 and the S-cell 1020 may perform carrier aggregation through configuration and activation operations, and may transmit and receive data through the aggregated frequency band.
- FIG. 11 is a conceptual diagram illustrating a protocol for supporting a multimedia broadcast multicast service (MBMS).
- MBMS multimedia broadcast multicast service
- a protocol for supporting MBMS may be defined for an MBMS user plane and an MBMS control plane.
- a broadcast multicast service center (BM-SC) 1100 performs authority verification and service start for MBMS bearer services.
- the BM-SC 1100 is responsible for scheduling and transmission in consideration of quality of service for MBMS content.
- the BM-SC 1100 may deliver its own broadcast content to the LTE network or may relay broadcast content in cooperation with an external content server.
- the BM-SC 1100 may use the SGmb interface for exchanging control messages with the MBMS-GW (gateway) 1120 and the SGi-mb interface for transmitting user traffic (content).
- the MBMS-GW 1120 performs a control (service start / end) function for the MBMS session and delivers the content to the eNB 1130 using an IP multicast transmission scheme.
- the MBMS-GW 1120 may use an Sm interface and an M1 interface for delivering user traffic to the eNB 1130 for exchanging control messages for a session with a mobility management entity (MME).
- MME mobility management entity
- the MME 1160 is in charge of controlling the MBMS session and has an M3 interface with the MCE 1170 for connection between the multi-cell / multicast coordination entity (MCE) 1170 and the MBMS-GW 1120.
- the MCE 1170 may perform management and allocation of radio resources for the eNBs 1130 belonging to the MCE 1170 and admission control for MBMS service.
- the MCE 1170 determines the modularity and coding level (hereinafter referred to as MCS) for MBMS services and performs control on the MBMS session.
- MCS modularity and coding level
- the eNB 1130 performs allocation of actual radio resources for broadcast services scheduled in the MCE 1170 and performs synchronized transmission for MBMS services.
- the MCE 1170 has an M2 interface for transmitting control signals with the eNB 1130.
- the UE 1150 performs reception on the synchronized MBMS data.
- the MCE 1170 is a logical node having a radio access function such as the eNB 1130.
- the MCE 1170 is physically separated from the eNB 1130 to centrally manage radio resources or distributed to each eNB 1130.
- the eNB 1130 may become a master and the MCE 1170 of the remaining eNB 1130 may have a structure of becoming a slave.
- the MBMS packet generated by the BM-SC 1100 may be delivered to the MBSM-GW 1120 through tunneling of a packet including SYNC information for synchronized transmission of a wireless section. .
- the MBMS-GW 1120 delivers SYNC information to the eNB 1130 in an IP multicast transmission scheme.
- the eNB 1130 transmits the synchronized packet to the terminal 1150 based on the SYNC information.
- the eNB 1130 has information for synchronized transmission of a radio section.
- the SYNC protocol can be used to know if a loss has occurred for packets sent from the BM-SC 1100.
- the PDCP layer is located in the BM-SC 1100 unlike unicast because the UE 1150 needs to maintain the same state of the PDCP even if the cell is changed in the MBSFN region.
- the UE may support MBMS in the RRC_IDLE and RRC_CONNECTED states.
- the MBMS support operation in the RRC_IDLE and RRC_CONNECTED state of the terminal will be described.
- the UE may perform the following operations.
- UE in RRC_IDLE state may be configured by UE-specific discontinuous reception (DRX).
- the UE may perform UE controlled mobility in the RRC_IDLE state.
- the terminal monitors a paging channel for detecting an incoming call, system information change, ETWS notification for a terminal capable of earthquake and tsunami warning system, and commercial mobile alert service (CMAS) notification.
- CMAS commercial mobile alert service
- the UE performs neighbor cell measurement and cell (re) selection by acquiring the system information.
- the terminal may perform the following operation.
- the UE may perform an operation of transmitting unicast data and an operation of receiving unicast data.
- the terminal may be set to UE-specific DRX (UE-specific DRX) in the lower layer (lower layer).
- UE-specific DRX UE-specific DRX
- one or more S-cells aggregated with the P-cell may be used for increased bandwidth.
- NACC network assistance
- the terminal may detect system information change, ETWS notification for ETWS capable terminal (s), CMAS notification for CMAS capable terminal (s), and / or paging channel and / or system information block type 1 content (system block type 1). contents) can be monitored.
- the terminal also monitors the control channel associated with the shared data channel to determine if data is scheduled at the terminal.
- the terminal provides channel quality and feedback information and performs neighbor cell measurement and measurement reporting.
- the terminal may also obtain system information.
- a multicast control channel which is a logical channel for transmitting control information of the MBMS, may have the following characteristics.
- the MCCH consists of a single MBSFN area configuration RRC message.
- Single MBSFN Area Configuration The RRC message lists all MBMS services with an ongoing session and an optional MBMS counting request message.
- the MCCH is transmitted to the UE by all cells in the MBSFN area except the MBSFN area reserved cell.
- MCCH is transmitted by RRC every MCCH repetition period.
- the MCCH may be sent on the changed period.
- the notification mechanism may be used to refer to changes in the MCCH due to the presence of a session start or MBMS counting request message.
- the MCCH information change notification may be periodically transmitted through the MBSFN subframe in the change period existing before the change of the MCCH.
- DCI format 1C masked with M-RNTI may be used for MCCH information change notification, and DCI format 1C masked with M-RNTI may include an 8-bit bitmap for indicating one or more MBSFN regions where the MCCH changes. have.
- the UE may monitor a subframe including one or more pieces of MCCH information change notification information per change period. When the UE receives the MCCH information change notification, the UE may acquire the MCCH at a next modification period boundary.
- the method of transmitting the change of the MCCH information to the UE may be performed by the following method.
- Changes in MCCH information can only occur in certain radio frames.
- the same MCCH information may be transmitted many times with an MCCH repetition period within the MCCH change period.
- the indication of the MBMS-specific RNTI (M-RNTI) in the PDCCH may be used to inform the UE of the RRC_IDLE state and the UE of the RRC_CONNECTED state of the change of MCCH information.
- the MCCH information change notification in the PDCCH may be transmitted periodically and may be transmitted through the MBSFN subframe.
- the MBMS capable RRC_IDLE terminal or the RRC_CONNECTED terminal may acquire MCCH information.
- the system information received by the UE in relation to MBMS may be transmitted as SIB 13 of Table 10 or SIB 15 of Table 11 below.
- SIB 13 may include information necessary for obtaining MBMS control information related to one or more MBSFN areas.
- the Mbsfn-AreaInfoList may include information on the information on the MCSF change period, information on the MCCH offset, and the MCCH repetition period on the MBSFN area identifier.
- MBMS-NotificationConfig may include information on a radio frame for which MCCH information change notification is scheduled.
- SIB 15 may include MBMS service area identities (SAIs) of current and / or neighbor carrier frequencies.
- SAIs MBMS service area identities
- sai-Inter-FreqList includes a list of neighbor frequencies that provide MBMS services and corresponding MBMS SAIs.
- sai-InterFreq contains a list of MBMS SAIs for the current frequency.
- sai-List contains a list of MBMS SAIs for a particular frequency.
- Positioning service means a service that provides information on the geographical location of the terminal.
- the LTE system defines a protocol between the terminal and the location information server to support the location information service.
- FIG. 12 is a conceptual diagram illustrating an operation between a terminal and a location information server.
- the terminal 1200 requests a location service from the MME 1220 or a specific component (eg, gateway mobile location center (GMLC) 1250) in an enhanced packet core (EPC). ) May be initiated by requesting the location service of a specific terminal to the MME 1220 or by requesting the location service for an emergency call.
- a location service from the MME 1220 or a specific component (eg, gateway mobile location center (GMLC) 1250) in an enhanced packet core (EPC).
- EPC enhanced packet core
- the MME 1220 may transmit a positioning service request message to an evolved serving mobile location center (E-SMLC) 1230.
- E-SMLC evolved serving mobile location center
- the E-SMLC 1230 Upon receiving the location service request message, the E-SMLC 1230 performs a location service related procedure with a serving eNB 1210 of the terminal 1200 to obtain measurement or assistance data for the location service. To start. In addition to or instead of this procedure initiation, the E-SMLC 1230 may initiate a procedure for direct measurement acquisition with the terminal 1200.
- a location measurement unit (LMU) 1240 of the corresponding terminal 1200 may be initiated.
- the E-SMLC 1230 transmits a location service response message for the terminal 1200 to the MME 1220 based on the obtained location service related measurement. Thereafter, the MME 1220 provides location information to the corresponding terminal 1200, provides location information to a specific component 1250 in the EPC, or transfers the related emergency call to the GMLC.
- FIG. 13 is a conceptual diagram illustrating a positioning reference signal (PRS).
- PRS positioning reference signal
- the left side of FIG. 13 shows resource mapping of a PRS in a resource block pair (RRP) when a normal CP is used.
- the upper left side uses one or two PBCH antenna ports and the lower left side uses four PBCH antenna ports.
- the upper right side uses one or two PBCH antenna ports and the lower right case uses four PBCH antenna ports.
- the PRS may be transmitted to the UE through a PRS subframe, which is a specific subframe in which the PRS is transmitted among a plurality of subframes.
- a downlink subframe in which a PRS is transmitted is referred to as a term called a PRS subframe.
- the CP length of the OFDM symbol constituting the PRS subframe may be determined depending on whether the MBSFN subframe is set to the PRS subframe.
- the CP of an OFDM symbol configured to transmit PRS in the MBSFN subframe may have the same length as the CP length of the OFDM symbol of subframe # 0.
- Subframe # 0 indicates a subframe that takes precedence over time in one frame.
- the CP of the OFDM symbol configured to transmit the PRS in the MBSFN subframe may be an extended CP.
- the CP length of the OFDM symbol constituting the control channel on the PRS subframe and the CP length of the OFDM symbol constituting the traffic channel on the PRS subframe may be different.
- the CP length of the OFDM symbol constituting the control channel and the CP length of the OFDM symbol constituting the traffic channel may be the same.
- the PRS may be defined as antenna port 6 and transmitted.
- Reference signal sequence in PRS May be determined based on Equations 3 and 4 described above.
- Reference signal sequence I is a complex value that is a modulated symbol used as a reference signal at antenna port 6 in slot ns Can be mapped to.
- k and l may be set as follows and may be mapped as shown in the top and bottom of FIG. 14 according to CP.
- the PRS may be resource mapped based on k and l defined as in Equation 5 below.
- the PRS may be resource mapped based on k and l defined as in Equation 6 below.
- Frequency bandwidth over which PRSs are transmitted in Equations 5 and 6 Can be set in a higher layer, the cell-specific frequency shift It can be set to.
- the PRS subframe in a cell is a cell specific PRS transmission period And cell-specific subframe offsets It can be set based on.
- Cell-specific PRS transmission period And cell-specific subframe offsets Is the index of the PRS settings set in the higher layer It can be determined based on.
- Table 12 below shows the PRS settings index. Indicates a configuration of a PRS subframe according to
- the CP length of the OFDM symbol for transmitting the PRS in the PRS subframe may vary depending on the configuration of the PRS subframe. That is, the CP length of the OFDM symbol for transmitting the PRS may vary depending on whether the PRS subframe is configured in the normal subframe and the MBSFN subframe at the same time or only in the MBSFN subframe.
- the UE may not decode the PDSCH data transmitted on the PRS subframe. For example, when the transmission mode of the terminal is set to 9 or 10 and the base station transmits PMCH data through a subframe set to MBSFN in a higher layer, the terminal does not decode the PDSCH. In addition, when the CP lengths of the PRS subframe and the subframe # 0 are different, the UE does not decode PDSCH data corresponding to the control information transmitted through the PDCCH scrambled with the C-RNTI or the SPS C-RNTI.
- the PRS subframe may be transmitted in the P-cell and / or the S-cell regardless of carrier aggregation setting.
- the base station uses a single FFT / IFFT to perform P-cell and / or S-cell.
- Data may be transmitted through a subframe on or receive data through a subframe on the P-cell and / or S-cell.
- Intra-band continuous carrier aggregation means carrier aggregation for a plurality of contiguous bands that are not discontinuous.
- an embodiment of the present invention relates to a method of transmitting a PRS subframe of a base station and a method of receiving a PRS subframe of a terminal in an LTE system supporting a single FFT / IFFT based intra-band continuous carrier aggregation.
- an embodiment of the present invention will be described on the assumption that the first cell and the second cell perform intra-band continuous carrier aggregation.
- the first cell may be a P-cell and the second cell may be an S-cell.
- FIG. 14 is a conceptual diagram illustrating a method of transmitting a PRS subframe according to an embodiment of the present invention.
- FIG. 14 illustrates a PRS subframe 1440 on the first cell 1400.
- a frame on the first cell 1400 may include a normal subframe and an MBSFN subframe.
- the PRS subframe may be configured only in the MBSFN subframe transmitted on the first cell 1400.
- the MBSFN subframe may be configured in at least one subframe of subframes # 1, # 2, # 3, # 6, # 7, and # 8 in the frame.
- a PRS subframe is configured in subframe # 2 1420 and subframe # 3 1430 which are MBSFN subframes.
- subframe # 0 1405 which is a normal subframe, uses a normal CP.
- 'NOR' in FIG. 14 indicates normal CP, and 'EX' indicates extended CP.
- the CP length of the OFDM symbol for transmitting the PRS may be set to the same CP as the CP used in subframe # 0. .
- an extended CP may be used for an OFDM symbol in which a PRS is transmitted in the MBSFN region of the MBSFN subframe.
- the PRS subframe may be configured as an MBSFN subframe, and the remaining subframes other than the PRS subframe among the plurality of subframes included in the frame including the PRS subframe may be configured as normal subframes. Assuming the same resource block as described above, the number of first CRSs mapped to one resource block on the MBSFN subframe may be smaller than the number of second CRSs mapped to one resource block on the normal subframe.
- the OFDM symbol for transmitting the PRS in the MBSFN region on the MBSFN subframe may be an extended CP. That is, the CP of the OFDM symbol constituting the MBSFN region of the PRS subframe 1440 may be an extended CP.
- the bottom of FIG. 14 shows a frame on the second cell 1450.
- the OFDM symbol may be a symbol generated by performing a single IFFT at the base station.
- a combination capable of performing intra band continuous carrier aggregation may be 10 MHz + 10 MHz, 10 MHz + 15 MHz, 10 MHz + 20 MHz, 15 MHz + 15 MHz, 15 MHz + 20 MHz, 20 MHz + 20 MHz, and the like.
- the OFDM symbol of the subframe 1470 on the second cell 1450 corresponding to the PRS subframe 1440 on the first cell 1400 in time corresponds to an extended CP. It may include.
- CP lengths of OFDM symbols generated as a result of a single IFFT may be defined as the same length. That is, the CP length of the OFDM symbol of the PRS subframe 11440 on the first cell 1400 and the CP length of the OFDM symbol of the PRS subframe 1470 on the second cell 1450 may be defined as the same length.
- another subframe included in the frame on the second cell is a subframe having an OFDM symbol of normal CP, and the subframe 1470 of the second cell 1450 corresponding in time to the PRS subframe on the first cell. May be a subframe having an OFDM symbol of an extended CP.
- some subframes 1460 on the second cell 1450 may include OFDM symbols of an extended CP differently from other subframes included in the same frame. That is, the plurality of subframes included in the frame on the second cell 1450 may be a subframe including OFDM symbols of different CPs.
- the subframe on the specific cell is also due to a single IFFT. If the CP length of the OFDM symbol included in the subframe different from the CP length of the OFDM symbol included, the operation of the terminal or the base station is described.
- a subframe of the second cell may be generated along with the PRS subframe on the first cell based on a single IFFT. If the CP length of the OFDM symbol included in the subframe of the generated second cell is different from the CP length of the OFDM symbol included in subframe # 0 (ie, the first subframe of the frame), the subframe of the generated second cell May be expressed as another CP (diff-CP) subframe.
- the CP length of the OFDM symbol included in subframe # 0 of the first cell and the CP length of the OFDM symbol included in subframe # 0 of the second cell may be the same. Accordingly, subframe # 0 may be a subframe on the first cell or the second cell. That is, another CP subframe may be generated when the length of the CP of the OFDM symbol included in the PRS subframe is different from the length of the CP of the subframe # 0.
- subframes 1425 and 1435 which are subframes defined by CP lengths (extended CPs) of other OFDM symbols, may be referred to as another-CP subframe 1470.
- the other-CP subframe 1470 is a subframe having a CP length different from the CP length of the OFDM symbol expected to be included in the subframe on the specific cell (eg, the second cell 1450).
- a UE that receives subframe # 2 1425 and subframe # 3 1435 from the second cell 1450 may have downlink data such as PDSCH data and EPDDCH data in subframe # 0 1455.
- it can be expected to be transmitted through subframe # 2 and subframe # 3 configured as normal CPs.
- downlink channel data and a signal are transmitted through another CP subframe
- downlink through an OFDM symbol having a CP length different from the CP length of the UE estimated based on subframe # 0 (1455).
- Data can be sent.
- the UE cannot receive data and / or signals transmitted through a downlink channel such as PDSCH due to a change in CP length in case of another-CP subframe.
- the UE may not perform decoding on traffic data transmitted through the other-CP subframe 1470. For example, when the UE receives another-CP subframe 1470 from the second cell 1450, for data transmitted through a downlink channel such as PDSCH and EPDCCH on another-CP subframe 1470, May not decode.
- a downlink channel such as PDSCH and EPDCCH
- the UE performs CP length of the OFDM symbol included in the PRS subframe on the first cell and OFDM included in subframe # 0. Symbol lengths may vary. In this case, the UE may not decode the PDSCH transmitted through the PRS subframe.
- the CP length of the OFDM symbol included in the PRS subframe on the first cell and the CP length of the OFDM symbol included in subframe # 0 may be different.
- the UE may not decode downlink data transmitted through the PRS subframe.
- the CP length of the OFDM symbol included in the subframe corresponding to the PRS subframe in time is different from the CP length of subframe # 0 of the second cell (that is, another CP subframe)
- the UE is included in the frame on the second cell. It may not decode downlink data transmitted through another CP subframe.
- the frame on the second cell 1450 includes another-CP subframe.
- the frame on the second cell 1450 may include a PRS frame
- the frame on the first cell 1400 may include another-CP subframe.
- the UE may not decode PDSCH data and EPDCCH data transmitted through another-CP subframe on the first cell.
- the CP length of the OFDM symbol included in the PRS subframe on the second cell may be different from the CP length of the OFDM symbol included in subframe # 0. have.
- the UE may not decode downlink data transmitted through the PRS subframe.
- the UE may not decode downlink data transmitted through another CP subframe on the first cell.
- downlink data is transmitted through PDSCH and EPDCCH of a data subframe on a first cell, and a PRS subframe is transmitted on a second cell.
- the data subframe is used as a term meaning a subframe transmitted on the first cell.
- the UE may determine whether to decode downlink data transmitted through PDSCH and EPDCCH on the data subframe.
- the terminal receives downlink data transmitted through a data subframe transmitted on a first cell (or a first serving cell).
- the terminal may receive configuration information about a plurality of PRS subframes for transmitting the PRS.
- the UE may determine whether to decode downlink data transmitted through PDSCH and EPDCCH on the data subframe according to the received configuration information.
- the UE decodes the data transmitted through the PDSCH and the EPDCCH on the data subframe. You can give up.
- the data subframe transmitted from the first cell is a subframe generated based on the same IFFT as at least one PRS subframe among the plurality of PRS subframes and is received in a time overlapping manner with at least one PRS subframe. It may be a frame.
- the UE may determine whether to decode data transmitted through PDSCH and EPDCCH on the PRS subframe according to the configuration information.
- FIG. 15 is a conceptual diagram illustrating a method of decoding a subframe by a terminal according to a timing advanced group (TAG) configuration of a base station according to an embodiment of the present invention.
- TAG timing advanced group
- the base station may manage by grouping carriers having the same or similar uplink timing.
- a group of carriers having similar uplink timing may be referred to as a timing advanced group (hereinafter, referred to as a TAG).
- TAG timing advanced group
- the first cell and the second cell may be set to the same TAG group.
- the third cell and the fourth cell have a similar uplink timing
- the third cell and the fourth cell may be set to the same TAG group.
- the cells included in the same TAG group may be cells that perform a single IFFT / FFT.
- decoding of downlink data transmitted through another-CP subframe or PRS subframe on a specific cell may not be performed according to CP length.
- TAG timing advanced group
- the first cell 1500, the second cell 1510, and the third cell 1520 may be intraband carrier aggregated cells. It may be assumed that the first cell 1500 and the second cell 1520 are the same TAG group.
- PRS subframes 1503 and 1506 may be transmitted on the first cell 1500, and other CP subframes 1513 and 1516 may be transmitted on a second cell included in the same TAG as the P-cell 1500. That is, the first cell 1500 and the second cell 1510 may be cells that perform a single FFT / IFFT.
- the subframes 1523 and 1526 may be generated without simultaneously performing the PRS subframes 1513 and 1516 and the FFT / IFFT. Can be.
- the UE may not perform decoding on the other-CP subframes 1513 and 1516 transmitted on the cell belonging to the same TAG as the first cell 1500, such as the second cell 1510. For example, the UE may not perform decoding on data transmitted through a downlink channel such as PDSCH and EPDCCH on other-CP subframes 1513 and 1516 transmitted from the second cell 1510. That is, the terminal may not monitor the channel transmitted through the other-CP subframes 1513 and 1516.
- a downlink channel such as PDSCH and EPDCCH
- the third cell 1520 is not included in the same TAG as the first cell 1500 in which the PRS subframe is transmitted. Accordingly, the UE may decode downlink data transmitted through subframes 1523 and 1526 transmitted on the third cell 1520. That is, according to an embodiment of the present invention, decoding may be performed on a downlink channel and a signal transmitted through a subframe transmitted on a cell other than the same TAG as the cell in which the other-CP subframe occurs.
- another sub-CP subframe may not be generated by setting the same subframe in which the PRS is transmitted in the first cell and the second cell.
- 16 is a conceptual diagram illustrating a method for transmitting a PRS subframe in a cell on which carrier aggregation is performed according to an embodiment of the present invention.
- PRS subframes 1653, 1656, 1663, and 1666 on the P-cell 1650 and the S-cell 1660 may be transmitted at the same timing.
- the E-SMLC 1610 may be configured to have the same PRS subframe of the two cells.
- a signal 1605 may be transmitted. This signal may be referred to as a PRS subframe timing setting signal 1605.
- the PRS subframe timing configuration signal 1605 may be transmitted from the terminal 1600, the base station (eNB) 1620, or the MME to the E-SMLC 1610.
- the terminal 1600 transmits certain cells when transmitting a physical cell ID to the E-SMLC 1610.
- Information on whether a single FFT / IFFT is implemented may be sent to the E-SMLC 1610.
- Information on which cells are implemented in a single FFT / IFFT may have a bitmap format, for example.
- Table 13 shows information about a physical cell ID and a cell list on which intraband carrier aggregation is implemented by a single FFT / IFFT.
- a list of cells implemented with a single FFT / IFFT among cells enumerated with a physical cell identifier may be transmitted based on IntrabandCACellList. For example, if information on five cells is requested, the UE may request '10100...' When the first cell and the third cell are implemented as a single FFT / IFFT. ' May be sent to the E-SMLC 1610.
- the E-SMLC 1610 may transmit information related to the configuration of the PRS subframe to the base station 1620 such that the PRSs of the first cell and the third cell are always set in the same subframe.
- the E-SMLC can perform the configuration of the transmission timing of the PRS subframe of the base station.
- the physical cell identifier information which may be implemented as such a single FFT / IFFT, may be transmitted from the eNB 1620 or the MME to the E-SMLC 1610 instead of the UE 1600.
- the UE When the transmission timings of the PRS subframes transmitted in the plurality of cells are set to be the same, the UE does not decode the PDSCH in the subframe in which the PRS is transmitted and does not monitor the EPDCCH even if it is configured to monitor the EPDCCH.
- the UE may receive the PRS according to the configuration of the PRS subframes of the P-cell and the S-cell.
- 17 is a block diagram showing a wireless communication system according to an embodiment of the present invention.
- the base station 1700 includes a processor 1710, a memory 1720, and an RF unit 1730.
- the memory 1720 is connected to the processor 1710 and stores various information for driving the processor 1710.
- the RF unit 1720 is connected to the processor 1710 to transmit and / or receive a radio signal.
- the processor 1710 implements the proposed functions, processes, and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 1710.
- the processor 1710 may include a wireless device 1750, a processor 1760, a memory 1770, and an RF unit 1780.
- the memory 1770 is connected to the processor 1760 and stores various information for driving the processor 1760.
- the RF unit 1780 is connected to the processor 1760 and transmits and / or receives a radio signal.
- Processor 1760 implements the proposed functions, processes, and / or methods. In the above-described embodiment, the operation of the wireless device may be implemented by the processor 1760.
- the processor 1760 receives downlink data on a data subframe transmitted on a first serving cell and receives configuration information regarding a plurality of PRS subframes for transmitting PRSs, wherein the plurality of PRS subframes are generated. 2 may be implemented to determine whether to decode the data transmitted on the serving cell, and transmitted on the PDSCH and EPDCCH on the data subframe according to the configuration information. If the length of the first cyclic prefix (CP) of the data subframe is different from the CP length of the first subframe of the first frame including the data subframe, the data transmitted through the PDSCH and the EPDCCH is abandoned by the terminal to be decoded.
- the data subframe may be implemented to overlap at least one PRS subframe among the plurality of PRS subframes.
- the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
- the RF unit may include a baseband circuit for processing a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in memory and executed by a processor.
- the memory may be internal or external to the processor and may be coupled to the processor by various well known means.
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Abstract
Description
Claims (8)
- 하향링크 서브프레임 상의 데이터를 디코딩하는 방법에 있어서,
단말이 제1 서빙 셀 상에서 전송된 데이터 서브프레임 상의 하향링크 데이터를 수신하는 단계;
상기 단말이 PRS를 전송하는 복수의 PRS 서브프레임에 관한 설정 정보를 수신하되, 상기 복수의 PRS 서브프레임은 제2 서빙셀 상에서 전송되는, 단계; 및
상기 설정 정보에 따라 상기 단말이 상기 데이터 서브프레임 상의 PDSCH(physical downlink shared channel) 및 EPDCCH(enhanced physical downlink control channel)을 통해 전송된 데이터를 디코딩할지 여부를 결정하는 단계를 포함하되,
상기 데이터 서브프레임의 제1 CP(cyclic prefix) 길이가 상기 데이터 서브프레임을 포함하는 제1 프레임의 첫번째 서브프레임의 CP 길이와 다른 경우, 상기 PDSCH 및 상기 EPDCCH를 통해 전송된 데이터는 상기 단말에 의해 디코딩이 포기되고,
상기 데이터 서브프레임은 상기 복수의 PRS 서브프레임 중 적어도 하나의 PRS 서브프레임과 중첩되는 데이터 수신 방법. - 제1항에 있어서,
상기 설정 정보에 따라 상기 단말이 상기 PRS 서브프레임 상의 PDSCH 및 EPDCCH를 통해 전송된 데이터를 디코딩할지 여부를 결정하는 단계를 더 포함하되,
상기 PRS 서브프레임의 제2 CP 길이가 상기 PRS 서브프레임을 포함하는 제2 프레임의 첫번째 서브프레임의 CP 길이와 다른 경우, 상기 PDSCH 및 상기 EPDDCH를 통해 전송된 데이터는 상기 단말에 의해 디코딩이 포기되는 데이터 수신 방법. - 제2항에 있어서,
상기 PRS 서브프레임은 MBSFN(multimedia broadcast single frequency network) 서브프레임으로 설정되고,
상기 제2 프레임에서 상기 PRS 서브프레임을 제외한 서브프레임은 노말(normal) 서브프레임으로 설정되고,
상기 MBSFN 서브프레임에 맵핑되는 제1 CRS의 개수는 상기 노말 서브프레임에 맵핑되는 제2 CRS의 개수보다 적고,
상기 제1 CRS는 로 초기화되는 슈도 랜덤 시퀀스로 결정되는 참조 신호 시퀀스를 기반으로 생성되고,
상기 는 상기 MBSFN 서브프레임의 슬롯 번호이고, 상기 는 상기 제1 서빙 셀의 식별자이고, 상기 는 상기 MBSFN 서브프레임의 슬롯의 OFDM 심볼의 CP 길이를 기반으로 결정되고,
상기 제2 CRS는 로 초기화되는 슈도 랜덤 시퀀스로 결정되는 참조 신호 시퀀스를 기반으로 생성되고,
상기 는 상기 노말 서브프레임의 슬롯 번호이고, 상기 는 상기 제1 서빙 셀의 식별자이고, 상기 는 상기 노말 서브프레임의 슬롯의 OFDM 심볼의 CP 길이를 기반으로 결정되는 데이터 수신 방법. - 제1항에 있어서,
상기 제1 서빙 셀과 상기 제2 서빙 셀은 캐리어 어그리게이션이 수행된 셀이고, 상기 제1 서빙 셀과 상기 제2 서빙 셀은 연속한 주파수 영역인 데이터 수신 방법. - 하향링크 서브프레임 상의 데이터를 디코딩하는 단말에 있어서, 상기 단말은,
상기 하향링크 서브프레임 상의 데이터를 수신하는 RF(radio frequency) 부; 및
상기 RF 부와 선택적으로 연결되는 프로세서를 포함하되, 상기 프로세서는,
제1 서빙 셀 상에서 전송된 데이터 서브프레임 상의 하향링크 데이터를 수신하고,
PRS를 전송하는 복수의 PRS 서브프레임에 관한 설정 정보를 수신하되, 상기 복수의 PRS 서브프레임은 제2 서빙셀 상에서 전송되고,
상기 설정 정보에 따라 상기 데이터 서브프레임 상의 PDSCH(physical downlink shared channel) 및 EPDCCH(enhanced physical downlink control channel)을 통해 전송된 데이터를 디코딩할지 여부를 결정하도록 구현되되,
상기 데이터 서브프레임의 제1 CP(cyclic prefix) 길이가 상기 데이터 서브프레임을 포함하는 제1 프레임의 첫번째 서브프레임의 CP 길이와 다른 경우, 상기 PDSCH 및 상기 EPDCCH를 통해 전송된 데이터는 상기 단말에 의해 디코딩이 포기되고,
상기 데이터 서브프레임은 상기 복수의 PRS 서브프레임 중 적어도 하나의 PRS 서브프레임과 중첩되는 단말. - 제5항에 있어서, 상기 프로세서는,
상기 설정 정보에 따라 상기 단말이 상기 PRS 서브프레임 상의 PDSCH 및 EPDCCH를 통해 전송된 데이터를 디코딩할지 여부를 결정하도록 구현되되,
상기 PRS 서브프레임의 제2 CP 길이가 상기 PRS 서브프레임을 포함하는 제2 프레임의 첫번째 서브프레임의 CP 길이와 다른 경우, 상기 PDSCH 및 상기 EPDCCH를 통해 전송된 데이터는 상기 단말에 의해 디코딩이 포기되는 단말. - 제6항에 있어서,
상기 PRS 서브프레임은 MBSFN(multimedia broadcast single frequency network) 서브프레임으로 설정되고,
상기 제2 프레임에서 상기 PRS 서브프레임을 제외한 서브프레임은 노말(normal) 서브프레임으로 설정되고,
상기 MBSFN 서브프레임에 맵핑되는 제1 CRS의 개수는 상기 노말 서브프레임에 맵핑되는 제2 CRS의 개수보다 적고,
상기 제1 CRS는 로 초기화되는 슈도 랜덤 시퀀스로 결정되는 참조 신호 시퀀스를 기반으로 생성되고,
상기 는 상기 MBSFN 서브프레임의 슬롯 번호이고, 상기 는 상기 제1 서빙 셀의 식별자이고, 상기 는 상기 MBSFN 서브프레임의 슬롯의 OFDM 심볼의 CP 길이를 기반으로 결정되고,
상기 제2 CRS는 로 초기화되는 슈도 랜덤 시퀀스로 결정되는 참조 신호 시퀀스를 기반으로 생성되고,
상기 는 상기 노말 서브프레임의 슬롯 번호이고, 상기 는 상기 제1 서빙 셀의 식별자이고, 상기 는 상기 노말 서브프레임의 슬롯의 OFDM 심볼의 CP 길이를 기반으로 결정되는 단말. - 제5항에 있어서,
상기 제1 서빙 셀과 상기 제2 서빙 셀은 캐리어 어그리게이션이 수행된 셀이고, 상기 제1 서빙 셀과 상기 제2 서빙 셀은 연속한 주파수 영역인 단말.
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