WO2014148783A1 - 방송채널할당 방법 및 방송채널 신호 송수신방법과 이를 지원하는 장치 - Google Patents
방송채널할당 방법 및 방송채널 신호 송수신방법과 이를 지원하는 장치 Download PDFInfo
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- WO2014148783A1 WO2014148783A1 PCT/KR2014/002223 KR2014002223W WO2014148783A1 WO 2014148783 A1 WO2014148783 A1 WO 2014148783A1 KR 2014002223 W KR2014002223 W KR 2014002223W WO 2014148783 A1 WO2014148783 A1 WO 2014148783A1
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- broadcast signals
- broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2385—Channel allocation; Bandwidth allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/30—Resource management for broadcast services
Definitions
- the present invention is used in a wireless access system, and relates to a new method for allocating a broadcast channel, a new method for transmitting and receiving broadcast channel signals, and an apparatus supporting the same.
- Wireless access systems are widely deployed to provide various kinds of communication services such as voice and data.
- a wireless access system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
- multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (0FDMA) systems, and single carrier (SC-FDMA) systems. frequency division multiple access) systems.
- An object of the present invention is to provide a method for configuring a new broadcast channel.
- Another object of the present invention is to provide a method for configuring a new broadcast channel in a small cell environment using an ultra high frequency band.
- Another object of the present invention is to provide a method for reducing the amount of resource area used by newly defining a broadcast channel.
- Another object of the present invention is to provide a broadcast channel signal transmission method capable of obtaining diversity gain while reducing overhead when transmitting broadcast channel signals.
- Another object of the present invention is to provide an apparatus supporting these methods.
- the present invention discloses a new method for allocating a broadcast channel in a wireless access system, a new method for transmitting and receiving broadcast channel signals, and apparatuses for supporting the same.
- a method for receiving a broadcast signal in a wireless access system includes periodically receiving one or more broadcast signals during a preset transmission time interval and a transmission position for one or more broadcast signals in the transmission time interval. And acquiring system information included in broadcast signals based on at least one of a transmission position and a transmission pattern.
- a terminal for receiving a broadcast signal in a wireless access system may include a receiver and a processor supporting reception of a broadcast signal.
- the processor controls the receiver to periodically receive one or more broadcast signals during a preset transmission time interval, obtain a transmission position and a transmission pattern for the one or more broadcast signals in the transmission time interval, and transmit the transmission position and transmission. It may be configured to obtain system information included in the broadcast signals based on one or more of the patterns.
- the broadcast signals may be composed of four broadcast signals.
- the four broadcast signals may include information on the most significant bits of the system frame number field, and one or more transmission positions and transmission pattern increments may indicate information on the least significant bits of the system frame number field.
- four broadcast signals may be transmitted through a region where a synchronization signal is transmitted and an adjacent region on a time or frequency axis.
- one or more broadcast signals may be transmitted together with the synchronization signal.
- a method for transmitting a broadcast signal in a wireless access system includes allocating a broadcast channel region for one or more broadcast signals and periodically performing one or more broadcast signals during a predetermined transmission time interval. May include broadcasting.
- one or more broadcast signals may be broadcast in a predetermined transmission pattern.
- a base station for transmitting a broadcast signal in a wireless access system may include a transmitter and a processor for transmitting the broadcast signal.
- the processor may be configured to allocate a broadcast channel region for one or more broadcast signals and to control the transmitter to periodically broadcast one or more broadcast signals for a predetermined transmission time interval.
- one or more broadcast signals may be broadcast in a predetermined transmission pattern.
- the broadcast signals may be composed of four broadcast signals.
- four broadcast signals may include information on the most significant bits of the system frame number field, and at least one of a transmission position and a transmission pattern may indicate information about the least significant bits of the system frame number field.
- four broadcast signals may be transmitted through an area in which a synchronization signal is transmitted and an area adjacent to each other on a time or frequency axis.
- one or more broadcast signals may be transmitted together with the synchronization signal.
- the broadcast signals may be composed of four broadcast signals.
- the four broadcast signals may include information on the most significant bits of the system frame number field, and at least one of a transmission position and a transmission pattern may indicate information on the least significant bits of the system frame number field.
- four broadcast signals may be transmitted through an area in which a synchronization signal is transmitted and an area adjacent to a time or frequency axis.
- one or more broadcast signals may be transmitted together with the synchronization signal.
- a method of configuring a new broadcast channel and a new method of broadcasting a broadcast channel signal can be provided.
- FIG. 1 is a diagram for explaining physical channels that can be used in embodiments of the present invention and a signal transmission method using the same.
- FIG. 2 shows the structure of a radio frame used in embodiments of the present invention.
- FIG. 3 is a diagram illustrating a resource grid for a downlink slot that may be used in embodiments of the present invention.
- FIG. 4 shows a structure of an uplink subframe that can be used in embodiments of the present invention.
- FIG. 5 shows a structure of a downlink subframe that can be used in embodiments of the present invention.
- FIG. 6 shows a subframe structure of an LTE-A system according to cross-carrier scheduling used in embodiments of the present invention.
- FIG. 7 is a diagram illustrating an example of an initial access procedure used in an LTE / LTE-A system.
- FIG. 8 is a diagram illustrating one method of transmitting a broadcast channel signal.
- FIG. 9 illustrates one method of allocating a physical broadcast channel.
- FIG. 10 is a diagram illustrating another method of allocating a physical broadcast channel.
- FIG. 11 is a diagram illustrating one method of implicitly transmitting system information by using an allocation pattern of a physical broadcast channel.
- FIG. 13 illustrates an example of a PBCH signal transmission method and a MIB detection method.
- the apparatus described with reference to FIG. 14 is a means in which the methods described with reference to FIGS. 1 to 13 may be implemented.
- Embodiments of the Invention described in detail below provide a new method for allocating a broadcast channel, a new method for transmitting and receiving broadcast channel signals, and apparatuses supporting the same.
- each component or feature may be considered to be optional unless otherwise stated.
- Each component or feature may be embodied in a form that is not combined with other components or features.
- some components and / or features may be combined to form an embodiment of the present invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in another embodiment, or may be replaced with other configurations or features of another embodiment.
- various operations performed for communication with a mobile station in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
- the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an advanced base station (ABS), or an access point.
- a terminal may be a user equipment (UE), a mobile station (MS), a subscriber station (SS), or a mobile subscriber station (MSS: Mobile). It may be replaced with terms such as Subscriber Station, Mobile Terminal, or Advanced Mobile Station (AMS).
- UE user equipment
- MS mobile station
- SS subscriber station
- MSS mobile subscriber station
- AMS Advanced Mobile Station
- the transmitting end refers to a fixed and / or mobile node that provides a data service or a voice service
- the receiving end refers to a fixed and / or mobile node that receives a data service or a voice service. Therefore, in uplink, a mobile station may be a transmitting end and a base station may be a receiving end. Similarly, in downlink, a mobile station may be a receiving end and a base station may be a transmitting end.
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802.11. Embodiments of the invention are described in 3GPP TS 36.211. 3GPP TS 36.212, 3GPP TS 36.213 and 3GPP TS 36.321 documents. That is, among the embodiments of the present invention Obvious steps or portions not described may be described with reference to the above documents. In addition, all terms disclosed in the present document can be described by the above standard document. ⁇
- the term 'synchronization signal' used in the embodiments of the present invention may be used in the same meaning as a term such as a synchronization sequence, a training thimble or a synchronization preamble.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC_FDMA single carrier frequency division multiple access
- CDMA may be implemented by radio technology such as UTRA Jniversal Terrestrial Radio Access) or CDMA2000.
- TDMA may be implemented in a wireless technology such as Global System for Mobile Communications (GSM) / Gener a 1 Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile Communications
- GPRS Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- 0FDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
- UTRA is a part of UMTS Jni versa 1 Mobile Telecommunications System.
- 3GPP Long Term Evolution (LTE) is an E ⁇ UMTS (Evolved UMTS) using E-UT A.
- 0FDMA is adopted in downlink
- SC—FDMA is adopted in uplink.
- the LTE-A (Advanced) system is an improved system of the 3GPP LTE system.
- embodiments of the present invention will be described based on the 3GPP LTE / LTE-A system, but can also be applied to IEEE 802.16e / m system and the like.
- a terminal receives information from a base station through downlink (DL) and transmits information to the base station through uplink (UL).
- the information transmitted and received by the base station and the terminal includes general data information and various control information, and various physical channels exist according to the type / use of the information they transmit and receive.
- FIG. 1 is a diagram for explaining physical channels that can be used in embodiments of the present invention and a signal transmission method using the same.
- the terminal In the state in which the power is turned off, the terminal is powered on again or enters a new cell, and performs an initial cell search operation such as synchronizing with the base station in step S11. To this end, the terminal receives a primary synchronization channel (P-SCH) and a floating channel (S—SCH: Secondary Synchronization Channel) from the base station, synchronizes with the base station, and obtains information such as a cell ID.
- P-SCH primary synchronization channel
- S—SCH Secondary Synchronization Channel
- the terminal may receive a physical broadcast channel (PBCH) signal from the base station to acquire broadcast information in the cell.
- PBCH physical broadcast channel
- the UE may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell discovery step.
- DL RS downlink reference signal
- the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to physical downlink control channel information in step S12. To obtain more specific system information.
- PDCCH physical downlink control channel
- PDSCH physical downlink control channel
- the terminal may perform a random access procedure such as steps S13 to S16 to complete the access to the base station.
- the UE transmits a preamble through a physical random access channel (P ACH) (S13), and a response to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel.
- P ACH physical random access channel
- the message may be received (S14).
- the UE may perform contention resolution such as transmitting additional physical random access channel signals (S15) and receiving physical downlink control channel signals and corresponding physical downlink shared channel signals (S16). Procedure).
- the UE After performing the above-described procedure, the UE subsequently receives a physical downlink control channel signal and / or a physical downlink shared channel signal as a general uplink / downlink signal transmission procedure (S17) and a physical uplink shared channel ( A PUSCH (physical uplink shared channel) signal and / or a physical uplink control channel (PUCCH) signal may be transmitted (S18).
- a physical downlink control channel signal and / or a physical downlink shared channel signal as a general uplink / downlink signal transmission procedure (S17) and a physical uplink shared channel (A PUSCH (physical uplink shared channel) signal and / or a physical uplink control channel (PUCCH) signal may be transmitted (S18).
- S17 general uplink / downlink signal transmission procedure
- a PUSCH (physical uplink shared channel) signal and / or a physical uplink control channel (PUCCH) signal may be transmitted (S18).
- UCI uplink control information
- HARQ-ACK / NACK Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK
- SR Scheduling Request
- CQI Channel Quality Indication
- PMI Precoding Matrix Indication
- RI Rank indication
- UCI is generally transmitted periodically through PUCCH, but when control information and traffic data should be transmitted at the same time, it can be transmitted through PUSCH. have.
- the UCI can be aperiodically transmitted through the PUSCH by request / instruction of the network.
- FIG. 2 shows a structure of a radio frame used in embodiments of the present invention.
- FIG. 2 (a) shows a frame structure type 1.
- the type 1 frame structure can be applied to both full du lex Frequency Division Duplex (FDD) systems and half duplex FDD systems.
- FDD Frequency Division Duplex
- One subframe is defined as two consecutive slots, and the i-th subframe consists of slots corresponding to 2i and 2i + l, that is, a radio frame is 10 subframes.
- slot includes a plurality of resource blocks (resource block) in the frequency domain comprises a plurality of OFDM symbols or SC-FDMA symbols in the time domain.
- One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain. Since 3GPP LTE uses 0FOMA in downlink, the OFDM symbol is for representing one symbol period. The OFDM symbol may be referred to as one SC-FDMA symbol or symbol period.
- a resource block is a resource allocation unit and includes a plurality of consecutive subcarriers ( ⁇ 1 ⁇ 31 €; 1-) in one slot.
- FIG. 2 (b) shows a frame structure type 2.
- the type 2 frame includes a special subframe consisting of three fields: 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 in the terminal.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
- the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- Table 1 shows the structure of a special frame (length of DwP S / GP / UpPTS).
- FIG. 3 is a diagram illustrating a resource grid for a downlink slot that may be used in embodiments of the present invention.
- one downlink slot includes a plurality of 0FDM symbols in the time domain.
- one downlink slot includes seven 0FDM symbols and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.
- Each element is a resource element on the resource grid, and one resource block includes 12 ⁇ 7 resource elements.
- the number NDL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.
- the structure of the uplink slot may be the same as that of the downlink slot.
- FIG. 4 shows a structure of an uplink subframe that can be used in embodiments of the present invention.
- an uplink subframe may be divided into a control region and a data region in the frequency domain.
- the control region is allocated a PUCCH carrying uplink control information.
- the data area is allocated with a PUSCH carrying user data.
- one UE does not simultaneously transmit PUCCH and PUSCH.
- the PUCCH for one UE is allocated an RB pair in a subframe. RBs belonging to an RB pair have different portions in each of the two slots. Occupies a carrier. This RB pair allocated to the PUCCH is said to be frequency hopping at the slot boundary (slot boundary).
- 5 shows a structure of a downlink subframe that can be used in embodiments of the present invention.
- a downlink control channel used in 3GPP LTE includes a Physical Control Format Indicator Channel (PCFICH), a PDCCH, and a Physical Hybrid-ARQ Indicator Channel (PHICH).
- PCFICH Physical Control Format Indicator Channel
- PDCCH Physical Downlink Control Channel
- PHICH Physical Hybrid-ARQ Indicator Channel
- the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of a control region) used for transmission of control channels in the subframe.
- the PHICH is a response channel for the uplink, and carries an ACK (Acknow 1 edgemen t) / NACK (Negat i ve Accept 1 edgemen t) signal for a hybrid automatic repeat request (HARQ).
- Control information transmitted through the PDCCH is called downlink control information (DCI).
- the downlink control information includes uplink resource allocation information, downlink resource allocation information, or an uplink transmission (Tx) power control command for a certain terminal group.
- a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (Rel ⁇ 8 or Rel-9) system (hereinafter, LTE system) is a multi-carrier that uses a single component carrier (CC) by dividing it into multiple bands. Multi-carrier modulation (MCM) is used.
- MCM Multi-carrier modulation
- 3GPP LTE ⁇ Advancecl system eg, Re 1-10 or Rei-11;
- the LTE-A system may use a method such as carrier aggregation (CA), which combines one or more component carriers to support a wider system bandwidth than the LTE system.
- Carrier aggregation may be replaced by the words carrier aggregation, carrier matching, multi-component carrier environment (Multi-CC) or multicarrier environment.
- the multi-carrier means the aggregation of carriers (or carrier aggregation), wherein the aggregation of carriers means not only merging between contiguous carriers but also merging between non-contiguous carriers.
- the number of component carriers aggregated between downlink and uplink may be set differently.
- the case where the number of downlink component carriers (hereinafter referred to as 'DL CC') and the number of uplink component carriers (hereinafter referred to as 'UL CC') is the same is called symmetric merging. It is called asymmetric (35 ⁇ ⁇ (:)) merging.
- carrier aggregation may be used interchangeably with terms such as carrier aggregation, bandwidth aggregation, spectrum aggregation, and the like.
- carrier aggregation in which two or more component carriers are combined, aims to support up to 100 MHz bandwidth.
- the bandwidth of the combining carrier may be limited to the bandwidth used by the existing system in order to maintain backward compatibility with the existing IMT system.
- the existing 3GPP LTE system supports ⁇ 1.4, 3, 5, 10, 15, 20 ⁇ MHz bandwidth
- 3GPP LTE—advanced system ie LTE-A
- the carrier aggregation system used in the present invention may support carrier aggregation by defining a new bandwidth regardless of the bandwidth used in the existing system.
- the carrier aggregation may be classified into an intra-band CA and an inter-band CAmaschine—band CA.
- Intra-band carrier aggregation means that a plurality of DL CCs and / or UL CCs are located adjacent to or in proximity to frequency.
- the terminal may use a plurality of R radio frequency) terminals to perform communication in a carrier aggregation environment.
- the LTE-A system uses a concept of a cell to manage radio resources.
- the carrier aggregation environment described above may be referred to as a multiple cell environment.
- a cell is defined as a combination of a downlink resource (DL CC) and an uplink resource (UL CC), but the uplink resource is not an essential element. Accordingly, the cell may be configured with only downlink resources, or with downlink resources and uplink resources.
- a specific UE when a specific UE has only one configured serving cell, it may have one DL CC and one UL CC, but when a specific UE has two or more configured serving cells Has as many DL CCs as the number of cells, and the number of UL CCs may be equal to or less than that. Or, conversely, DL CC and UL CC may be configured. That is, when a specific UE has a plurality of configured serving cells, a carrier aggregation environment in which a UL CC is larger than the number of DL CCs may be supported.
- carrier merge may be understood as a merge of two or more cells, each having a different carrier frequency (center frequency of the cell).
- the term 'cell' should be distinguished from 'cell' as a geographic area covered by a commonly used base station.
- intra-band carrier merging is referred to as an intra-band multi-cell
- inter-band carrier merging is referred to as an inter-multiplex cell.
- Cells used in the LTE-A system include a Primary Cell (PCell) and a Secondary Cell (SCell). The P cell and the S cell may be used as a serving cell.
- PCell Primary Cell
- SCell Secondary Cell
- the serving cells may be configured through an RRC parameter.
- PhysCellld is the cell's physical layer identifier and has an integer value from 0 to 503.
- SCell Index is a short identifier used to identify an S cell and has an integer value from 1 to 7.
- ServCelllndex is a short identifier used to identify a serving cell (either Pcell or Scell) and has an integer value from 0 to 7. A value of zero is applied to Psal, and SCelllndex is given in advance to apply to Scell. That is, the cell having the smallest cell ID (or cell index) in ServCelllndex becomes Psal.
- P cell refers to a cell operating on a primary frequency (or a primary CO.
- the UE may be used to perform an initial connection establishment process or to perform a connection re-establishment process.
- a P cell refers to a cell which is the center of control-related communication among serving cells configured in a carrier aggregation environment, that is, a UE allocates and transmits a PUCCH only in its own P cell. Only P cells may be used to acquire system information or to change a monitoring procedure
- E-UTRAN Evolved Universal Terrestrial Radio Access
- mobilityControlInfo mobility control information
- the S cell may mean a cell operating on a secondary frequency (or secondary CO. Only one P cell may be allocated to a specific UE, and one or more S cells may be allocated. After being made, it can be used to provide configurable and additional radio resources PUCCH does not exist in the remaining cells except the Pcell, that is, the Scell, among serving cells configured in the carrier aggregation environment.
- the E-UTRAN may provide all system information related to the operation of the related cell in the RRC_C0NNECTED state through a dedicated signal.
- the change of the system information can be controlled by the release and addition of the related S cells, and at this time, the RRCConnectionReconfigutaion message of the upper level may be used.
- the E-UTRAN may perform dedicated signaling with different parameters for each terminal, rather than broadcasting in an associated S cell.
- the E-UTRAN may configure a network including one or more Scells in addition to the Pcells initially configured in the connection establishment process.
- the P cell and the S cell can operate as respective component carriers.
- the primary component carrier (PCC) may be used in the same sense as the P cell
- the secondary component carrier (SCC) may be used in the same meaning as the S cell.
- Cross carrier scheduling In a carrier aggregation system, there are two types of a self scheduling scheme and a cross carrier scheduling scheme in terms of scheduling of a carrier (or carrier) or a serving cell.
- Cross carrier scheduling may be referred to as Cross Component Carrier Scheduling or Cross Cell Scheduling.
- Self-scheduling is performed through a UL CC in which a PDCCH and a DLSCH are transmitted in the same DL CC or a PUSCH transmitted according to a PDCCHOJL Grant transmitted in a DL CC is linked to a DL CC in which a UL Grant is received. Means to be transmitted.
- a UL CC in which a PDCCH and a DLSCH are transmitted to different DL CCs or a PUSCH transmitted according to a PDCCHUiL Grant transmitted in a DL CC is linked to a DL CC having received an UL grant. This means that it is transmitted through other UL CC.
- Whether to perform cross carrier scheduling may be activated or deactivated UE-speciiic, and may be known for each UE semi-statically through higher layer signaling (eg, RRC signaling). .
- higher layer signaling eg, RRC signaling
- a carrier indicator field (CIF: Carrier Indicator Field) indicating a PDSCH / PUSCH indicated by the corresponding PDCCH is transmitted to the PDCCH.
- the PDCCH may allocate PDSCH resources or PUSCH resources to one of a plurality of component carriers using CIF. That is, CIF is set when a PDSCH or PUSCH resource is allocated to one DL / UL CC increment in which the PDCCH on the DL CC is highly aggregated.
- the DCI format of LTE Release-8 may be extended according to CIF.
- the configured CIF may be fixed as a 3 bit field or the position of the configured CIF may be fixed regardless of the DCI format size.
- the PDCCH structure (same coding and resource mapping based on the same CCE) of LTE Release-8 may be reused.
- the PDCCH on the DL CC allocates PDSCH resources on the same DL CC or PUSCH resources on a single bulk UL CC, CIF is not configured.
- the same PDCCH structure (same coding and resource mapping based on the same CCE) and DCi format as LTE Release-8 may be used.
- the UE When cross-carrier scheduling is possible, the UE provides PDCCHs for a plurality of DCIs in a control region of the monitoring CC according to a transmission mode and / or bandwidth for each CC. It is necessary to monitor. Therefore, the structure of the search space that can support this
- the terminal DL CC set represents a set of DL CCs scheduled for the terminal to receive a PDSCH
- the terminal UL CC set represents a set of UL CCs scheduled for the UE to transmit a PUSCH.
- the PDCCH monitoring set represents a set of at least one DL CC that performs PDCCH monitoring.
- the PDCCH monitoring set may be the same as the UE DL CC set or may be a subset of the UE DL CC set.
- the PDCCH monitoring set may include at least one of DL CCs in the terminal DL CC set. Alternatively, the PDCCH monitoring set may be defined separately regardless of the UE DL CC set.
- the DL CC included in the PDCCH monitoring set may be configured to always enable self-scheduling for the linked UL CC.
- the UE DL (X set, the UE UL CC set and the PDCCH monitoring set may be set to the UE).
- Specific JE—specific, UE group-specific or cell-specific may be set.
- the PDCCH monitoring set When cross carrier scheduling is deactivated, it means that the PDCCH monitoring set is always the same as the UE DL CC set. In this case, an indication such as separate signaling for the PDCCH monitoring set is not necessary.
- the PDCCH monitoring set when cross-carrier scheduling is activated, is preferably defined in the terminal DL CC set. That is, in order to schedule PDSCH or PUSCH for the UE, the base station transmits the PDCCH through only the PDCCH monitoring set.
- FIG. 6 shows a subframe structure of an LTE-A system according to cross carrier scheduling used in embodiments of the present invention.
- DL CC 'A' represents a case in which a PDCCH monitoring DL CC is configured. If CIF is not used, each DL CC is without CIF. PDCCH scheduling its PDSCH may be transmitted. On the other hand, when used through CIF virtual layer signaling, only one DL CC 'A' may transmit a PDCCH for scheduling its own PDSCH or PDSCH of another CC using CIF. At this time, DL CCs 'B' and 'C' that are not configured as PDCCH monitoring DL CCs do not transmit the PDCCH.
- the initial access process may include a cell search process, a system information acquisition process, and a random access procedure.
- FIG. 7 is a diagram illustrating an example of an initial access procedure used in an LTE / LTE-A system.
- the UE may acquire downlink synchronization information by receiving synchronization signals (for example, primary synchronization signal (PSS) and secondary synchronization signal (SSS)) transmitted from the base station.
- synchronization signals for example, primary synchronization signal (PSS) and secondary synchronization signal (SSS)
- PSS primary synchronization signal
- SSS secondary synchronization signal
- the synchronization signals are transmitted twice every frame (10 ms units). That is, the synchronization signals are transmitted every 5 ms (S710).
- the downlink synchronization information obtained in step S710 includes a physical cell identifier (PCID), a downlink time and frequency synchronization, and a cyclic prefix (CP) . Length information and the like.
- PCID physical cell identifier
- CP cyclic prefix
- the terminal receives a PBCH signal transmitted through a physical broadcast channel (PBCH).
- PBCH physical broadcast channel
- the PBCH signal is repeatedly transmitted four times with different scrambling times for 4 frames (that is, 40 ms) (S720).
- the PBCH signal includes a MIB (Master Infurmation Block) as one of system information.
- MIB Master Infurmation Block
- One MIB has a total size of 24 bits, and an increase of 14 bits indicates physical HARQ indication channel (PHICH) configuration information downlink cell bandwidth (cU-banclwiclth) information. Used to indicate a frame number (SFN). The remaining 10 bits consist of extra bits.
- PHICH physical HARQ indication channel
- cU-banclwiclth configuration information downlink cell bandwidth
- SFN frame number
- the terminal is different system information blocks transmitted from the base station: the rest of the system information may deukhal stroke "by receiving (SIB System Information Block).
- SIBs are transmitted on the DL-SCH, and the presence or absence of the SIB is confirmed as a PDCCH signal masked with SI—RNTI (System Information Radio Network Temporary Identities) (S730).
- SI—RNTI System Information Radio Network Temporary Identities
- SIB enhancement system information block type l includes parameters necessary for determining whether a corresponding cell is a cell suitable for cell selection and information on time axis scheduling for other SIBs.
- the system information block type 2 (SIB2) includes shared channel information and shared channel information.
- SIB3 to SIB8 include information on cell reselection, inter-frequency, intra-frequency, and the like.
- SIB9 is used to convey the name of the home base station (HeNB: Home eNodeB), and SIB10-SIB12 is the Earthquake and Tsunami Warning Service (ETWS) notification and disaster warning system (CMAS). Contains a warning message.
- SIB13 includes MBMS related control information.
- the terminal may perform a random access procedure when performing steps S710 to S730.
- the UE may acquire parameters for transmitting a PRACKPhysical Random Access Channel (SIGNAL) signal. Therefore, the terminal may perform a random access procedure with the base station by generating and transmitting a PRACH signal using the parameters included in the SIB2 (S740).
- SIGNAL PRACKPhysical Random Access Channel
- PBCH Physical Broadcast Channel
- the PBCH is used for MIB transmission.
- a method of configuring a PBCH will be described.
- bit blocks) (..., ⁇ ,-!))
- a cell-specific sequence before modulation to yield a scrambled bit block ((o), .. (M b , t 1)) .
- , means the number of bits transmitted on the PBCH, 1920 bits for the normal cyclic prefix, 1728 bits are used for the extended cyclic prefix.
- Equation 1 shows one method of scrambling a bit block.
- Equation 1 ⁇ ) represents a scrambling sequence.
- the block of scrambled bits (0),... ( M bit -l) are modulated and calculated as complex value modulation symbol blocks ( ⁇ ... ⁇ (M ⁇ b -l)).
- the modulation scheme applicable to the physical broadcast channel is quadrature phase shift keying (QPSK).
- the modulation symbol blocks (o), ..., ⁇ M symb -i)) are mapped to one or more layers.
- M s ( y 0 M symb .
- the modulation symbol blocks are then precoded and calculated as vector blocks ( ⁇ (/ ⁇ ) ⁇ .
- p represents the number of the antenna port for the cell specific reference signal.
- Resource elements for reference signals are excluded from every third.
- the mapping operation assumes that there are cell specific reference signals for antenna ports 0-3 regardless of the actual configuration.
- the UE assumes that reference signals are reserved but assumes that resource elements not used for transmission of the reference signal are not available for PDSCH transmission. The terminal makes no other assumptions about these resource elements.
- the MIB is system information transmitted through the PBCH.
- the MIB includes system information transmitted through the BCH.
- Signaling radio bearer is not applied to MIB
- RLC—SAP Radio Link Control-Service Access Point
- TKTransparent Mode logical channel is Broadcast Control Channel (BCCH), and is transmitted from E-UTRAN to UE.
- Table 2 below shows an example of the MIB format.
- the MIB includes a downlink bandwidth (cU -Bandwidth) parameter, a PHICH configuration parameter, a system frame number parameter, and an extra bit.
- cU -Bandwidth downlink bandwidth
- the downlink bandwidth parameter represents 16 different transmission bandwidth configurations (N RB ). For example, n6 corresponds to 6 resource blocks and nl5 corresponds to 15 resource blocks.
- PHICH configuration parameter on the PDCCH necessary to receive the DL-SCH Represents a PHICH setting necessary for receiving a control signal.
- the system frame number (SFN) parameter defines the most significant eight bits of the SFN. At this time, the least significant 2 bits of the SFN are obtained indirectly through decoding of the PBCH. For example, a 40 ms timing of PBCH ⁇ may indicate LSB 2 bits. This will be described in detail with reference to FIG. 8.
- FIG. 8 is a diagram illustrating one method of transmitting a broadcast channel signal.
- the MIB transmitted through the BCCH which is a logical channel
- the BCH which is a transport channel
- the MIB is mapped to the transport block
- the CRC is added to the MIB transport block
- the MIB is transmitted to the physical channel PBCH through channel coding and rate matching.
- the MIB is mapped to the resource element (RE) through a scrambling, modulation, layer mapping, and precoding process. That is, the same PBCH signal is scrambled with different scrambling sequences for 40 ms period (ie 4 frames) and then transmitted.
- the UE may detect one PBCH for 40 ms through blind decoding, and may estimate the remaining 2 bits of the SFN through this.
- the LSB of the SFN is set to '00', and if the PBCH signal is transmitted in the second radio frame, the LSB is set to '01'.
- LSB is set to '10' when transmitted in the third radio frame, and LSB may mean '11' when transmitted in the last wireless frame.
- the PBCH may be allocated to 72 subcarriers in the middle of the first four OFDM symbols of the second slot (slot # 1) of the first subframe (subframe # 0) of each frame.
- the subcarrier region to which the PBCH is allocated is always 72 subcarrier regions among the cell bandwidths regardless of cell bandwidth. This is to enable the UE to detect the PBCH even if the UE does not know the size of the downlink cell bandwidth.
- a Primary Synchronization Channel through which a primary synchronization signal (PSS) is transmitted has a TTI of 5 ms and subframe # 0 in each frame. And the last symbol of the first slot of slot # 5 (slot # 0).
- Unit synchronization signal portion is a synchronization channel (SSS) is transferred (SSC: Secondary Synchronization Channel) is assigned to have a same TTI of 5ms, the second symbol (that is, just before the PSS symbol) at the end of the slot.
- SSC Secondary Synchronization Channel
- the PSC and the SSC always occupy the middle 72 subcarriers regardless of the cell bandwidth, and are allocated to the 62 subcarriers.
- an environment with small cell coverage is established. Because, in the microwave communication system, the path loss is larger than that of the conventional celller band. Therefore, in the ultra high-frequency wireless communication environment, the cell coverage is smaller than that of the conventional cell system. Therefore, in a small cell environment using an ultra high frequency band, the SNR of a signal received by the UE may have a relatively large value. This may require relatively small robustness when the base station transmits the PBCH.
- the MIB may include one or more of downlink bandwidth (dl-Bandwidth) information, PFIICH configuration (phich-Config) information, and SFN (SystemFrameNumber) information.
- dl-Bandwidth downlink bandwidth
- PFIICH configuration phich-Config
- SFN SystemFrameNumber
- FIG. 9 is a diagram illustrating one method of allocating a physical broadcast channel.
- the PBCH may be divided into four regions and allocated.
- the existing network system has allocated a PBCH to four OFDM symbols separate from a synchronization channel (ie, PSS / SSS). Since the small leak in the environment is less i groups cell coverage, even if transmission by increasing the coding rate (coding rate) of the PBCH signal can be the UE receives the PBCH signal reliably. Therefore, in the embodiments of the present invention, unlike four conventional OFDM A small number of resource elements could be allocated to the PBCH without using all of the symbol regions.
- the network system may allocate the PBCH to the OFDM symbol assigned PSS / SSS.
- the PBCH may be allocated adjacent to a synchronization channel such as PSS / SSS and a frequency domain. That is, as shown in FIG. 9, four PBCHs B1 to B4 may be allocated around the PSS / SSS allocation area.
- B1 B2, B3, and B4 mean an allocated physical broadcast channel region, respectively.
- B1 to B4 may mean a broadcast signal transmitted through a broadcast channel, respectively.
- the base station uses the same transmission period as that of the PSS / SSS signal so as to obtain the maximum time diversity for the PBCH signal.
- PBCH signal can be transmitted.
- the base station may transmit four PBCH signals reversed in the time and / or frequency domain so as to maximize time / frequency diversity with respect to the PBCH signal.
- FIG. 9 (a) shows an embodiment of inverting and assigning a PBCH region in a time and frequency domain
- FIG. 9 (b) shows an embodiment of inverting and assigning a PBCH region in a frequency domain.
- B1 to B4 (first broadcast channel to fourth broadcast channel) allocated as a broadcast channel may be a channel region allocated by dividing one PBCH into one of self-decodable channels.
- B1-B4 may be configured to be self-decryptable, respectively. That is, in the former case, the terminal may acquire the MIB by performing decoding after receiving all signals B1 to B4. However, in the latter case, the terminal may acquire the MIB after receiving at least one of B1 to B4.
- 9 shows an example of the allocation pattern of the PBCH, and B1 to M may be mapped to four PBCH allocation regions in different shape allocation patterns. That is, the allocation order of B1 to M may be different from FIG. 9.
- PBCHs B1 to B4 may be allocated to 10 subcarriers that are not used for PSS / SSS transmission in 72 subcarriers occupied by PSS / SSS (see FIG. 8). That is, B1 to B4 may be allocated to one OFDM symbol region and five subcarrier regions, respectively. sure,.
- the positions to which B1 to B4 are allocated follow the scheme described with reference to FIG. 9, and the size of the resource region to which B1 to B4 is allocated may vary according to the amount of information of the MIB required by the system.
- FIG. 10 illustrates another method of allocating a physical broadcast channel.
- a method of configuring a PBCH in FIG. 10 is basically the same as that of FIG. 9. However, the method of configuring a transmission period for the PBCH is different from FIG. 9.
- the PBCH may be allocated in units of 10ms, which is a transmission period of the existing PBCH.
- PSS / SSS which is a synchronization channel
- PBCH is allocated to 10ms.
- the transmission period of the PBCH may be dynamically changed.
- PBCH may be allocated every Nms, and N value may be defined as a system parameter.
- a sync channel and a PBCH are allocated adjacent to each other on a frequency axis, and only a sync channel is transmitted in a subframe to which a PBCH is not allocated.
- sync channels are allocated to 62 subcarriers in the last two OFDM symbols of the first slot as in the past. If a PBCH is assigned The PBCH may be allocated to 10 subcarriers except for an area to which synchronization channels are allocated among 72 subcarriers.
- FIG. 11 is a diagram illustrating one method of implicitly transmitting system information by using an allocation pattern of a physical broadcast channel. '
- the UE performs blind decoding on a PBCH to transmit information on the last 2 bits of the SFN and PCFHICH / PDCCH / PBCH signals based on a detection position of the PBCH. It is possible to obtain the number of antennas used to.
- LSB 2 bits of the SFN and antenna information can be obtained through the same method as the conventional method.
- the UE uses the divided PBCH (B1 to B4) transmission pattern transmitted for 20 ms within 20 ms.
- Information on which PBCH has priority may be obtained indirectly.
- the PBCHs (ie, B1 to B4) transmitted every 5ms have a CRC added thereto, and the UE performs blind decoding on allocating patterns of the PBCHs changed every 5ms (for example, the order of the transmitted PBCHs). For example, SFN LSB 2bits), information about the number of transmit antennas. And / or other system information.
- the size of the MBS of the SFN included in the MIB may be further reduced.
- the size of the MBS may be further compensated by the allocation position pattern of B1 to B4.
- the UE acquires 2 bits of the SFN by detecting a subframe to which B1 to B4 are allocated, and transmits the bit through the allocation pattern of B1 to B4 transmitted in the TTI of the PBCH. Two bits of the next LSB may be additionally obtained.
- the SFN transmitted through B1 to B4 may define only 6 MSB bits.
- FIG. 12 is a diagram illustrating yet another method of allocating a physical broadcast channel.
- FIGS. 9 and 10 illustrate a case where the PBCH is allocated adjacent to the synchronization signal in the frequency domain.
- the method of allocating the PBCH adjacent to the frequency domain of the synchronization channel has an advantage that the UE can simultaneously acquire the synchronization channel and the PBCH.
- interference may occur between the PBCH and the synchronization signals.
- the network system may allocate the PBCH as shown in FIG. 12 with a delay in time.
- the base station can obtain transmission diversity in the time and frequency domain when B1 to B4 are transmitted in the specific time and frequency domain.
- the reason for assigning the PBCH as shown in FIG. 12 comes from the assumption that the reception SNR of the UE is high in the small cell environment. For example, by increasing the channel coding rate for the PBCH, the amount of radio resources allocated for the PBCH can be reduced, and the overhead for PBCH signal transmission can be reduced.
- Embodiments of the present invention may configure self-decoded divided BCHs in constructing the PBCI, or may enable self-decoding with a bundle of divided BCHs. Therefore, the divided BCHs can be transmitted to obtain diversity gain in time and frequency.
- FIG. 13 is a diagram illustrating an example of a PBCH signal transmission method and a MIB detection method.
- the base station may allocate a resource region for the PBCH.
- a resource allocation method for the ith j ⁇ and BPCH may use the methods described with reference to FIGS. 9 to 12 (S1310).
- the base station may broadcast PBOi signals B1 to B4 through a PBCH region allocated during TTI of the PBCH.
- the transmission pattern of B1 to B4 may use the method described with reference to FIG. 11.
- other types of transmission patterns may be used according to system requirements (S1320).
- the transmission position of B1 to B4 may be an adjacent resource region in the frequency domain with the PSS / SSS in the OFDM symbol through which a synchronization signal such as PSS / SSS is transmitted.
- the allocation pattern of B1 to B4 may be changed for each transmission period. For details, refer to the description of FIGS. 9 to 12.
- the UE may receive B1 to B4 in the TTI in which the PBCH signal is transmitted.
- ⁇ ⁇ may be set to 20ms, and if the PBCH signal is transmitted every 10ms, the TTI may be set to 40ms.
- the UE is the location of the subframe (ie, PBCH transmission location) is transmitted B1 to B4 and
- a transmission pattern of B1 to B4 can be obtained within the TTI (S1330).
- the terminal may receive one or more B1 to B4 and detect the MIB.
- the terminal may detect the MIB after receiving and decoding all of the B1 to B4. That is, the terminal is based on the information obtained through B1 ' through B4, and the transmission location and transmission pattern of the PBCH.
- the MIB may be obtained (S1340).
- the apparatus described in FIG. 14 is a means in which the methods described in FIGS. 1 to 13 may be implemented.
- the user equipment (JE) may operate as a transmitting end in uplink and a receiving end in downlink.
- an e-Node B (eNB) may operate as a receiving end in uplink and a transmitting end in downlink.
- the terminal and the base station include transmission modules (Tx module: 1440, 1450) and reception modules (Rx module: 1450, 1470) to control transmission and reception of information, data, and / or messages, respectively.
- antennas 1400 and 1410 for transmitting and receiving information, data, and / or messages.
- the terminal and the base station each of the processor (Processor 1420, 1430) for performing the above-described embodiments of the present invention and the memory (1480, 1490) that can temporarily or continuously store the processing of the processor Each may include.
- Embodiments of the present invention may be performed using the components and functions of the terminal and the base station apparatus.
- the processor of the base station may allocate the PBCH and transmit B1 to B4 in the transmission pattern and transmission location by combining the methods disclosed in the above sections 1-3.
- the terminal receives the PBCH signals during ⁇ in which the PBCH is transmitted. Thereafter, the terminal may acquire the MIB included in the received broadcast signals based on the transmission position and the transmission pattern of the received broadcast signals.
- Such operations may refer to the methods described with reference to FIGS. 9 to 13.
- the transmission module and the reception module included in the terminal and the base station are packet modulation / demodulation function, high-speed packet channel coding function, orthogonal frequency division multiple access (0FDMA) packet scheduling, time division, for data transmission. Time division duplex (TDD) packet scheduling and / or channel multiplexing may be performed.
- the UE and the base station of FIG. 14 may further include low-power radio frequency (RF) / intermediate frequency (IF) models.
- RF radio frequency
- IF intermediate frequency
- the transmission modules and the reception modules may be called transmitter transmitters, respectively, and when used together, may be called transceivers.
- the terminal is a personal digital assistant (PDA), a cell phone phone, a personal communication service (PCS) phone, a GSMCGlobal System for Mobile (WCDMA) phone, a WCDMA (Wideband CDMA) phone, Mobile Broadband System (MBS) phones, Hand-He Id PCs, notebook PCs, Smart phones, or multi-mode multi-band (M-Mode: Muiti Mode-Mult i Band) terminals can be used.
- PDA personal digital assistant
- PCS personal communication service
- WCDMA Wideband CDMA
- MBS Mobile Broadband System
- a smart phone is a terminal that integrates data communication functions such as schedule management, fax transmission and Internet access, etc. Can mean.
- a multimode multiband terminal is a multi-mode chip that can operate in both portable Internet systems and other mobile communication systems (for example, code division multiple access (CDMA) 2000 systems, WCDM wideband CDMA system) Say the terminal.
- CDMA code division multiple access
- Embodiments of the present invention may be implemented through various means.
- embodiments of the invention may be implemented by hardware, firmware, software, or a combination thereof.
- the method according to the embodiments of the present invention may include one or more application specific integrated circuits (ASICs), clinical signal processors (DSPs), digital signal processing devices (DSPDs), and PLDs ( programmable logic devices), FPGAs (ield programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs clinical signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs yield programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- the method according to the embodiments of the present invention may be implemented in the form of modules, procedures, or functions that perform the functions or operations described above.
- the software code may be stored in the memory units 1480 and 1490 and driven by the processors 1420 and 1430.
- the memory The unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- Embodiments of the present invention may be applied to various radio access systems: as an example of various radio access systems, 3rd Generation Partnership Project (3GPP), 3GPP2 and / or IEEE 802.xx (Institute of Electrical and Electronic Engineers 802). System).
- 3GPP 3rd Generation Partnership Project
- 3GPP2 3rd Generation Partnership Project2
- IEEE 802.xx Institute of Electrical and Electronic Engineers 802). System
- Embodiments of the present invention can be applied not only to the various wireless access systems, but also to all technical fields using the various wireless access systems.
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Abstract
Description
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JP2015562937A JP6392792B2 (ja) | 2013-03-17 | 2014-03-17 | 放送チャネル割り当て方法、放送チャネル信号送受信方法、及びこれらの方法を支援する装置 |
CN201480016498.9A CN105144731B (zh) | 2013-03-17 | 2014-03-17 | 分配广播信道的方法、发送和接收广播信道信号的方法、以及用于支持其的设备 |
US14/773,740 US9736659B2 (en) | 2013-03-17 | 2014-03-17 | Method for allocating broadcast channel, method for transmitting and receiving broadcast channel signal, and device for supporting same |
EP14769651.2A EP2978230B1 (en) | 2013-03-17 | 2014-03-17 | Method for allocating broadcast channel, method for transmitting and receiving broadcast channel signal, and device for supporting same |
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2014
- 2014-03-17 CN CN201480016498.9A patent/CN105144731B/zh not_active Expired - Fee Related
- 2014-03-17 EP EP14769651.2A patent/EP2978230B1/en not_active Not-in-force
- 2014-03-17 KR KR1020157024333A patent/KR102235175B1/ko active IP Right Grant
- 2014-03-17 WO PCT/KR2014/002223 patent/WO2014148783A1/ko active Application Filing
- 2014-03-17 JP JP2015562937A patent/JP6392792B2/ja active Active
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018506907A (ja) * | 2015-01-22 | 2018-03-08 | 日本テキサス・インスツルメンツ株式会社 | ポイント・ツー・マルチポイントnlosワイヤレスバックホールのための低オーバーヘッドシグナリング |
JP2021073801A (ja) * | 2015-01-22 | 2021-05-13 | 日本テキサス・インスツルメンツ合同会社 | ポイント・ツー・マルチポイントnlosワイヤレスバックホールのための低オーバーヘッドシグナリング |
JP7339972B2 (ja) | 2015-01-22 | 2023-09-06 | テキサス インスツルメンツ インコーポレイテッド | ポイント・ツー・マルチポイントnlosワイヤレスバックホールのための低オーバーヘッドシグナリング |
JP2018196145A (ja) * | 2015-05-22 | 2018-12-06 | エイスーステック コンピューター インコーポレーテッドASUSTeK COMPUTER INC. | 無線通信システムにおける基準信号送信を実行するための方法および装置 |
US10992439B2 (en) | 2015-05-22 | 2021-04-27 | Asustek Computer Inc. | Method and apparatus for implementing reference signal transmissions in a wireless communication system |
US11431456B2 (en) | 2015-05-22 | 2022-08-30 | Asustek Computer Inc. | Method and apparatus for implementing reference signal transmissions in a wireless communication system |
Also Published As
Publication number | Publication date |
---|---|
KR20160002698A (ko) | 2016-01-08 |
EP2978230B1 (en) | 2019-01-02 |
EP2978230A1 (en) | 2016-01-27 |
JP2016512405A (ja) | 2016-04-25 |
CN105144731A (zh) | 2015-12-09 |
EP2978230A4 (en) | 2016-10-19 |
US20160029179A1 (en) | 2016-01-28 |
JP6392792B2 (ja) | 2018-09-19 |
CN105144731B (zh) | 2018-11-09 |
US9736659B2 (en) | 2017-08-15 |
KR102235175B1 (ko) | 2021-04-02 |
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