WO2013009052A2 - 무선 통신 시스템에서 프리앰블의 전송 전력을 결정하는 방법 및 장치 - Google Patents
무선 통신 시스템에서 프리앰블의 전송 전력을 결정하는 방법 및 장치 Download PDFInfo
- Publication number
- WO2013009052A2 WO2013009052A2 PCT/KR2012/005406 KR2012005406W WO2013009052A2 WO 2013009052 A2 WO2013009052 A2 WO 2013009052A2 KR 2012005406 W KR2012005406 W KR 2012005406W WO 2013009052 A2 WO2013009052 A2 WO 2013009052A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- scell
- pcell
- path loss
- cell
- base station
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 103
- 230000005540 biological transmission Effects 0.000 title claims abstract description 66
- 238000004891 communication Methods 0.000 title claims abstract description 30
- 230000002776 aggregation Effects 0.000 claims abstract description 10
- 238000004220 aggregation Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 description 25
- 230000004044 response Effects 0.000 description 14
- 230000015654 memory Effects 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 9
- 230000011664 signaling Effects 0.000 description 6
- 238000013468 resource allocation Methods 0.000 description 5
- 230000004913 activation Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 235000015429 Mirabilis expansa Nutrition 0.000 description 1
- 244000294411 Mirabilis expansa Species 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 235000013536 miso Nutrition 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- 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
- H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
- H04W52/325—Power control of control or pilot channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and apparatus for determining a transmit power of a preamble in a wireless communication system.
- the next generation multimedia wireless communication system which is being actively researched recently, requires a system capable of processing and transmitting various information such as video, wireless data, etc., out of an initial voice-oriented service.
- the fourth generation of wireless communication which is currently being developed after the third generation of wireless communication systems, aims to support high-speed data services of downlink 1 gigabits per second (Gbps) and uplink 500 megabits per second (Mbps).
- Gbps gigabits per second
- Mbps megabits per second
- the purpose of a wireless communication system is to enable a large number of users to communicate reliably regardless of location and mobility.
- a wireless channel is a path loss, noise, fading due to multipath, inter-symbol interference (ISI) or mobility of UE.
- ISI inter-symbol interference
- There are non-ideal characteristics such as the Doppler effect.
- Various techniques have been developed to overcome the non-ideal characteristics of the wireless channel and to improve the reliability of the wireless communication.
- a carrier aggregation (CA) supporting a plurality of cells may be applied.
- the CA may be called another name such as bandwidth aggregation.
- CA means that when a wireless communication system attempts to support broadband, one or more carriers having a bandwidth smaller than the target broadband are collected to form a broadband.
- a target carrier may use the bandwidth used by the existing system as it is for backward compatibility with the existing system. For example, in 3GPP LTE, bandwidths of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz are supported, and in 3GPP LTE-A, a bandwidth of 20 MHz or more can be configured using only the bandwidth of the 3GPP LTE system.
- broadband can be configured by defining new bandwidth without using the bandwidth of the existing system.
- the random access procedure is a process performed by the terminal to access the base station.
- the UE may perform a random access procedure by transmitting a random access preamble to the base station. If the CA is supported, the terminal may perform a random access process for a plurality of cells.
- CA is supported, a method for efficiently determining the transmit power of the random access preamble in a random access process for a plurality of cells is required.
- An object of the present invention is to provide a method and apparatus for determining the transmit power of a preamble in a wireless communication system.
- the present invention provides a method for determining the transmission power of a physical random access channel (PRACH) preamble in a random access process when a random access procedure for a secondary cell (SCell; secondary cell) of a terminal is initiated by an indication of a base station. do.
- PRACH physical random access channel
- SCell secondary cell
- the present invention provides a method for determining the transmit power of a PRACH preamble based on the DL pathloss of the SCell.
- a method for determining transmit power of a preamble by a user equipment (UE) in a wireless communication system includes a SCell path loss for a downlink (DL) CC in a linkage relationship with an uplink (UL) component carrier (CC) in a secondary cell (SCell).
- DL downlink
- UL uplink
- SCell secondary cell
- the SCell and the primary cell constitutes a carrier aggregation system (CA)
- the PCell is the terminal performs radio resource control (RRC) connection with the base station
- RRC radio resource control
- the DL CC may be in a SystemInformationBlockType2 (SIB2) connection relationship with a UL CC in the SCell.
- SIB2 SystemInformationBlockType2
- P CAMX, c (i) is the transmit power of the configured terminal defined for the subframe i of the PCell
- PL C represents the estimated SCell path loss.
- the transmission power of the PRACH preamble may be determined based on a difference between the path loss of the PCell and the estimated SCell path loss.
- P CAMX, c (i) is the transmission power of the terminal configured for the subframe i of the PCell
- PL C is the path loss of the PCell
- PL diff is the path loss of the PCell and the estimated Scell path The difference value of the loss is shown.
- the difference between the path loss of the PCell and the estimated SCell path loss may be received from the base station.
- the difference between the path loss of the PCell and the estimated SCell path loss may be received from the base station through any one of a radio resource control (RRC) layer, a media access control (MAC) layer, or a physical layer (PHY) layer.
- RRC radio resource control
- MAC media access control
- PHY physical layer
- the difference between the path loss of the PCell and the estimated SCell path loss may be received from a base station through a physical downlink control channel (PDCCH) order.
- PDCH physical downlink control channel
- the difference between the path loss of the PCell and the estimated SCell path loss may be included in downlink control information (DCI) format 1A and received from the base station through a PDCCH indication.
- DCI downlink control information
- the UL CC in the SCell may be a UL extension carrier that cannot operate as a stand-alone carrier.
- the DL CC may be a DL CC having a virtual connection relationship with an UL extension carrier.
- the DL CC in a virtual connection relationship with the UL extension carrier may be indicated by a base station through a higher layer.
- the DL CC in a virtual connection relationship with the UL extension carrier may be predetermined.
- the PCell provides at least one of non-access stratum (NAS) mobility information and security input at RRC establishment, RRC re-establishmenet, or handover. It may be a cell.
- NAS non-access stratum
- a terminal for determining a transmit power of a preamble in a wireless communication system includes a radio frequency (RF) unit for transmitting or receiving a radio signal, and a processor connected to the RF unit, wherein the processor includes an uplink (UL) configuration in a secondary cell (SCell).
- RF radio frequency
- SCell secondary cell
- a CA carrier aggregation system
- the PCell is a cell in which the UE performs radio resource control (RRC) connection with the base station
- RRC radio resource control
- Remaining is characterized in that at least one cell, in the cell.
- 1 is a wireless communication system.
- FIG. 2 shows a structure of a radio frame in 3GPP LTE.
- FIG 3 shows an example of a resource grid for one downlink slot.
- 5 shows a structure of an uplink subframe.
- FIG. 6 shows an example of a subframe structure of a 3GPP LTE-A system that is cross-carrier scheduled through CIF.
- FIG. 7 shows an example in which two cells have different UL transmission timings in a CA environment.
- FIG 8 shows an example in which a random access procedure for the SCell of the UE is initialized according to the indication of the base station.
- FIG. 9 illustrates an embodiment of a general random access procedure.
- FIG. 10 shows an embodiment of a method for determining the transmit power of the proposed preamble.
- FIG. 11 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
- 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 a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
- GSM global system for mobile communications
- GPRS general packet radio service
- EDGE enhanced data rates for GSM evolution
- OFDMA may be implemented by wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.
- IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
- UTRA is part of a universal mobile telecommunications system (UMTS).
- 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), which employs OFDMA in downlink and SC in uplink -FDMA is adopted.
- LTE-A (advanced) is the evolution of 3GPP LTE.
- 1 is a wireless communication system.
- the wireless communication system 10 includes at least one base station (BS) 11.
- Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c.
- the cell can in turn be divided into a number of regions (called sectors).
- the UE 12 may be fixed or mobile and may have a mobile station (MS), a mobile terminal (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, or a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms.
- the base station 11 generally refers to a fixed station communicating with the terminal 12, and may be called in other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have.
- eNB evolved-NodeB
- BTS base transceiver system
- access point and the like. have.
- a terminal typically belongs to one cell, and a cell to which the terminal belongs is called a serving cell.
- a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
- a base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are relatively determined based on the terminal.
- downlink means communication from the base station 11 to the terminal 12
- uplink means communication from the terminal 12 to the base station 11.
- the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12.
- the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.
- the wireless communication system may be any one of a multiple-input multiple-output (MIMO) system, a multiple-input single-output (MIS) system, a single-input single-output (SISO) system, and a single-input multiple-output (SIMO) system.
- MIMO multiple-input multiple-output
- MIS multiple-input single-output
- SISO single-input single-output
- SIMO single-input multiple-output
- the MIMO system uses a plurality of transmit antennas and a plurality of receive antennas.
- the MISO system uses multiple transmit antennas and one receive antenna.
- the SISO system uses one transmit antenna and one receive antenna.
- the SIMO system uses one transmit antenna and multiple receive antennas.
- the transmit antenna means a physical or logical antenna used to transmit one signal or stream
- the receive antenna means a physical or logical antenna used to receive one signal or stream.
- FIG. 2 shows a structure of a radio frame in 3GPP LTE.
- a radio frame consists of 10 subframes, and one subframe consists of two slots. Slots in a radio frame are numbered with slots # 0 through # 19. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). TTI may be referred to as a scheduling unit for data transmission. For example, one radio frame may have a length of 10 ms, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
- One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of subcarriers in the frequency domain.
- the OFDM symbol is used to represent one symbol period since 3GPP LTE uses OFDMA in downlink, and may be called a different name according to a multiple access scheme.
- SC-FDMA when SC-FDMA is used as an uplink multiple access scheme, it may be referred to as an SC-FDMA symbol.
- a resource block (RB) includes a plurality of consecutive subcarriers in one slot in resource allocation units.
- the structure of the radio frame is merely an example. Accordingly, the number of subframes included in the radio frame, the number of slots included in the subframe, or the number of OFDM symbols included in the slot may be variously changed.
- 3GPP LTE defines that one slot includes 7 OFDM symbols in a normal cyclic prefix (CP), and one slot includes 6 OFDM symbols in an extended CP. .
- CP normal cyclic prefix
- Wireless communication systems can be largely divided into frequency division duplex (FDD) and time division duplex (TDD).
- FDD frequency division duplex
- TDD time division duplex
- uplink transmission and downlink transmission are performed while occupying different frequency bands.
- uplink transmission and downlink transmission are performed at different times while occupying the same frequency band.
- the channel response of the TDD scheme is substantially reciprocal. This means that the downlink channel response and the uplink channel response are almost the same in a given frequency domain. Therefore, in a TDD based wireless communication system, the downlink channel response can be obtained from the uplink channel response.
- the uplink transmission and the downlink transmission are time-divided in the entire frequency band, and thus the downlink transmission by the base station and the uplink transmission by the terminal cannot be simultaneously performed.
- uplink transmission and downlink transmission are performed in different subframes.
- FIG 3 shows an example of a resource grid for one downlink slot.
- the downlink slot includes a plurality of OFDM symbols in the time domain and N RB resource blocks in the frequency domain.
- the number N RB of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell. For example, in the LTE system, N RB may be any one of 6 to 110.
- One resource block includes a plurality of subcarriers in the frequency domain.
- the structure of the uplink slot may also be the same as that of the downlink slot.
- Each element on the resource grid is called a resource element.
- an exemplary resource block includes 7 ⁇ 12 resource elements including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of OFDM symbols and the number of subcarriers in the resource block is equal to this. It is not limited. The number of OFDM symbols and the number of subcarriers can be variously changed according to the length of the CP, frequency spacing, and the like. For example, the number of OFDM symbols is 7 for a normal CP and the number of OFDM symbols is 6 for an extended CP. The number of subcarriers in one OFDM symbol may be selected and used among 128, 256, 512, 1024, 1536 and 2048.
- the downlink subframe includes two slots in the time domain, and each slot includes seven OFDM symbols in the normal CP.
- the leading up to 3 OFDM symbols (up to 4 OFDM symbols for 1.4Mhz bandwidth) of the first slot in the subframe are the control regions to which control channels are allocated and the remaining OFDM symbols are the physical downlink shared channel (PDSCH). Becomes the data area to be allocated.
- PDSCH physical downlink shared channel
- the PDCCH includes resource allocation and transmission format of downlink-shared channel (DL-SCH), resource allocation information of uplink shared channel (UL-SCH), paging information on PCH, system information on DL-SCH, and random access transmitted on PDSCH. Resource allocation of higher layer control messages such as responses, sets of transmit power control commands for individual UEs in any UE group, activation of voice over internet protocol (VoIP), and the like.
- a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
- the PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs).
- CCEs control channel elements
- CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
- the CCE corresponds to a plurality of resource element groups.
- the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
- the base station determines the PDCCH format according to the DCI to be sent to the terminal, and attaches a cyclic redundancy check (CRC) to the control information.
- CRC cyclic redundancy check
- RNTI a unique radio network temporary identifier
- the PDCCH is for a specific terminal, a unique 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
- 5 shows a structure of an uplink subframe.
- the uplink subframe may be divided into a control region and a data region in the frequency domain.
- the control region is allocated a physical uplink control channel (PUCCH) for transmitting uplink control information.
- the data region is allocated a physical uplink shared channel (PUSCH) for transmitting data.
- the terminal may support simultaneous transmission of the PUSCH and the PUCCH.
- PUCCH for one UE is allocated to an RB pair in a subframe.
- Resource blocks belonging to a resource block pair occupy different subcarriers in each of the first slot and the second slot.
- the frequency occupied by the resource block belonging to the resource block pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
- the terminal may obtain a frequency diversity gain by transmitting uplink control information through different subcarriers over time.
- m is a location index indicating a logical frequency domain location of a resource block pair allocated to a PUCCH in a subframe.
- the uplink control information transmitted on the PUCCH includes a hybrid automatic repeat request (HARQ) acknowledgment (ACK) / non-acknowledgement (NACK), a channel quality indicator (CQI) indicating a downlink channel state, and an uplink radio resource allocation request. (scheduling request).
- HARQ hybrid automatic repeat request
- ACK acknowledgment
- NACK non-acknowledgement
- CQI channel quality indicator
- the PUSCH is mapped to the UL-SCH, which is a transport channel.
- the uplink data transmitted on the PUSCH may be a transport block which is a data block for the UL-SCH transmitted during the TTI.
- the transport block may be user information.
- the uplink data may be multiplexed data.
- the multiplexed data may be a multiplexed transport block and control information for the UL-SCH.
- control information multiplexed with data may include a CQI, a precoding matrix indicator (PMI), a HARQ, a rank indicator (RI), and the like.
- the uplink data may consist of control information only.
- a carrier aggregation (CA) supporting a plurality of cells may be applied.
- a plurality of base stations and terminals can communicate through up to five cells.
- Five cells may correspond to a bandwidth of up to 100 MHz. That is, the CA environment represents a case in which a specific UE has two or more configured serving cells (hereinafter, referred to as cells) having different carrier frequencies.
- the carrier frequency represents the center frequency of the cell.
- the cell represents a combination of DL resources and optionally UL resources. That is, the cell must include DL resources, and may optionally include UL resources combined with the DL resources.
- the DL resource may be a DL component carrier (CC).
- the UL resource may be a UL CC.
- the linkage between the carrier frequency of the DL CC and the carrier frequency of the UL CC may be indicated by system information transmitted on the DL CC.
- the system information may be system information block type2 (SIB2).
- a terminal supporting a CA may use a primary cell (PCell) and one or more secondary cells (SCell) for increased bandwidth. That is, when two or more cells exist, one cell becomes a PCell and the other cells become Scells. Both PCell and SCell can be serving cells.
- a terminal in an RRC_CONNECTED state that does not support CA or cannot support CA may have only one serving cell including a PCell.
- a terminal in an RRC_CONNECTED state supporting CA may have one or more serving cells including a PCell and all SCells. Meanwhile, the UL-DL configuration of all cells in the TDD system may be all the same.
- the PCell may be a cell operating at a primary frequency.
- the PCell may be a cell in which the terminal performs radio resource control (RRC) connection with the network.
- the PCell may be a cell having the smallest cell index.
- the PCell may be a cell that first attempts random access through a physical random access channel (PRACH) among a plurality of cells.
- the PCell may be a cell in which the terminal performs an initial connection establishment process or a connection reestablishment process in a CA environment. Alternatively, the PCell may be a cell indicated in the handover process.
- the terminal may acquire non-access stratum (NAS) mobility information (eg, a tracking area indicator (TAI)) during RRC connection / reconfiguration / handover through the PCell.
- NAS non-access stratum
- TAI tracking area indicator
- the terminal may obtain a security input during RRC reset / handover through the PCell.
- the UE may receive and transmit the PUCCH only in the PCell.
- the terminal may apply system information acquisition and system information change monitoring only to the PCell.
- the network may change the PCell of the UE supporting the CA in the handover process by using the RRCConnectionReconfiguration message including the MobilityControlInfo.
- the SCell may be a cell operating at a secondary frequency. SCell is used to provide additional radio resources.
- the PUCCH is not allocated to the SCell.
- the network When adding the SCell, the network provides all the system information related to the operation of the related cell in the RRC_CONNECTED state to the terminal through dedicated signaling.
- the change of system information with respect to the SCell may be performed by releasing and adding related cells, and the network may independently add, remove, or modify the SCell through an RRC connection reconfiguration process using an RRCConnectionReconfiguration message.
- the LTE-A terminal supporting CA may simultaneously transmit or receive one or a plurality of CCs according to capacity.
- the LTE rel-8 terminal may transmit or receive only one CC when each CC constituting the CA is compatible with the LTE rel-8 system. Therefore, if at least the number of CCs used in the uplink and the downlink is the same, all CCs need to be configured to be compatible with the LTE rel-8.
- the plurality of CCs may be managed by a media access control (MAC).
- MAC media access control
- the receiver in the terminal When the CA is configured in the DL, the receiver in the terminal should be able to receive a plurality of DL CCs, and when the CA is configured in UL, the transmitter in the terminal should be able to transmit a plurality of UL CCs.
- the backward compatible carrier is a carrier that can be connected to a terminal of all LTE releases including LTE rel-8, LTE-A, and the like.
- the backward compatibility carrier may operate as a single carrier or as a CC configuring a CA.
- the backward compatibility carrier may always be configured as a pair of DL and UL in an FDD system.
- the non-compatible carrier can not be connected to the terminal of the previous LTE release, and can only access more than the terminal of the LTE release defining the carrier.
- the non-compatible carrier may operate as a single carrier or as a CC constituting a CA like the backward compatible carrier.
- An extension carrier is a carrier that cannot operate as a single carrier.
- the extended carrier should be a CC constituting a CA including at least one carrier capable of operating as a single carrier.
- a non-compliant carrier is referred to as an extended carrier.
- a DL CC and a UL CC in a cell have an SIB2 linkage. For example, when a UL grant is transmitted through a PDCCH allocated to a DL CC, a PUSCH is allocated to a UL CC having a SIB2 connection relationship with the DL CC.
- control channel in the DL and UL may be performed based on the CC in the SIB2 connection relationship.
- the corresponding DL / UL extended carrier does not have a UL / DL CC having a SIB2 connection.
- cross carrier scheduling may be applied.
- a PDCCH on a specific DL CC may schedule a PDSCH on any one of a plurality of DL CCs or a PUSCH on any one of a plurality of UL CCs.
- a carrier indicator field may be defined for cross carrier scheduling.
- CIF may be included in the DCI format transmitted on the PDCCH. The presence or absence of the CIF in the DCI format may be indicated by the higher layer semi-statically or UE-specifically.
- the CIF may indicate a DL CC on which the PDSCH is scheduled or an UL CC on which the PUSCH is scheduled.
- the CIF may be fixed 3 bits and may exist in a fixed position regardless of the size of the DCI format. If there is no CIF in the DCI format, the PDCCH on a specific DL CC may schedule a PDSCH on the same DL CC or may schedule a PUSCH on a UL CC connected to the specific DL CC with the SIB2.
- the base station may allocate the PDCCH monitoring DL CC set to reduce the complexity of blind decoding of the terminal.
- the PDCCH monitoring DL CC set is part of the entire DL CC, and the UE performs blind decoding only on the PDCCH in the PDCCH monitoring DL CC set. That is, in order to schedule PDSCH and / or PUSCH for the UE, the base station may transmit the PDCCH through only the DL CCs in the PDCCH monitoring DL CC set.
- the PDCCH monitoring DL CC set may be configured to be UE specific, UE group specific, or cell specific.
- FIG. 6 shows an example of a subframe structure of a 3GPP LTE-A system that is cross-carrier scheduled through CIF.
- a first DL CC of three DL CCs is configured as a PDCCH monitoring DL CC. If cross carrier scheduling is not performed, each DL CC transmits a respective PDCCH to schedule a PDSCH. When cross carrier scheduling is performed, only the first DL CC set as the PDCCH monitoring DL CC transmits the PDCCH.
- the PDCCH transmitted on the first DL CC schedules the PDSCHs of the first DL CC as well as the PDSCHs of the second DL CC and the third DL CC using CIF.
- the second DL CC and the third DL CC not configured as the PDCCH monitoring DL CC do not transmit the PDCCH.
- cross carrier scheduling is not supported for the PCell. That is, the PCell is always scheduled by its PDCCH.
- the UL grant and DL assignment of a cell are always scheduled from the same cell. That is, if the DL is scheduled on the second carrier in the cell, the UL is also scheduled on the second carrier.
- the PDCCH order can be transmitted only on the PCell.
- frame timing, super frame number (SFN) timing, and the like in the aggregated cells may be aligned.
- the UE may transmit uplink control information such as channel state information (CSI), ACK / NACK signal, etc. received, detected, or measured from one or more DL CCs to a base station through a predetermined UL CC.
- CSI channel state information
- the terminal may receive a plurality of ACKs / ACKs for data received from each DL CC.
- NACK signals may be multiplexed or bundled and transmitted to the base station through the PUCCH of the UL CC of the PCell.
- intra-band CA and inter-band CA may be considered.
- intraband CA is considered first.
- the band means operating bandwidth and is defined as a frequency range in which the system operates.
- Table 1 shows an example of an operating bandwidth used in 3GPP LTE. This may refer to Table 5.5-1 of 3GPP TS 36.104 V10.0.0.
- a plurality of DL CCs or UL CCs configuring a CA environment are adjacent to each other in a frequency domain. That is, a plurality of DL CCs or UL CCs configuring the CA environment may be located within the same operating bandwidth. Therefore, in the intra band CA, each cell may be configured on the premise that they have similar propagation characteristics. At this time, the propagation characteristics may include propagation / path delay, propagation / path loss, fading channel impact, and the like, which may vary according to frequency or center frequency.
- the terminal may acquire UL transmission timing for the UL CC in the PCell, and the UL transmission timing of the UL CCs in the SCell may be set to be the same as the transmission timing of the acquired PCell. have. Accordingly, the UL subframe boundaries between cells are identically aligned in the terminal, and the terminal may communicate with the base station in a CA environment through one radio frequency (RF). However, the PRACH transmission timing may be different for each cell.
- RF radio frequency
- a plurality of DL CCs or UL CCs configuring a CA environment may not be adjacent to each other in the frequency domain. Due to allocation of remaining frequencies, reuse of frequencies previously used for other purposes, and the like, a plurality of CCs constituting the CA environment may not be adjacent to each other in the frequency domain.
- the carrier frequency of one cell may be 800 MHz in DL and UL, and the carrier frequency of the other cell may be 2.5 GHz in DL and UL.
- the carrier frequency of one cell may be 700 MHz in DL and UL
- the carrier frequency of the other cell may be 2.1 GHz in DDL and 1.7 GHz in UL.
- the terminal may communicate with the base station through a plurality of RF in an interband CA environment.
- FIG. 7 shows an example in which two cells have different UL transmission timings in a CA environment.
- FIG. 7- (a) shows the UL transmission timing of the first cell
- FIG. 7- (b) shows the UL transmission timing of the second cell.
- the base station transmits a DL signal at the same time through the first cell and the second cell.
- the terminal receives the DL signal through the first cell and the second cell.
- the DL propagation delay of the second cell is greater than the DL propagation delay of the first cell. That is, the terminal receives the DL signal through the second cell later than the DL signal through the first cell.
- Each cell may have a different timing advance (TA) value.
- the TA value of the first cell is TA 1
- the TA value of the second cell is TA 2 .
- Each cell may have a different UL transmission timing.
- the UL subframe of the first cell and the UL subframe of the second cell are not aligned with each other.
- Each cell must perform UL transmission based on a different TA value.
- Current 3GPP LTE-A does not support different UL transmission timing between cells.
- the UL propagation delay of the second cell is greater than the UL propagation delay of the first cell.
- FIG. 7 it is assumed for convenience that both DL / UL propagation delays of the second cell are larger than DL / UL propagation delays of the first cell. However, this is only an example, and the DL propagation delay and the UL propagation delay may not be proportional to each other. .
- a method for efficiently obtaining a plurality of UL transmission timings when CA is supported.
- the method of obtaining a plurality of UL transmission timings described below may be applied regardless of an UL access scheme.
- the UL access scheme is SC-FDMA, but may also be applied when the UL access scheme is OFDMA or the like.
- a random access procedure for the SCell of the UE may be initialized. That is, when a specific SCell is added, the terminal may acquire UL transmission timing of the corresponding SCell.
- the random access procedure for the SCell of the terminal may be initialized by the instruction of the base station.
- the base station may instruct the terminal to perform a random access procedure for the SCell after the SCell is added, or after the SCell is activated.
- the time point at which the base station instructs the terminal to perform a random access process is not limited thereto.
- the base station instructs the terminal to perform a random access process after the corresponding SCell is activated.
- the indication of the base station may be a PDCCH order.
- FIG 8 shows an example in which a random access procedure for the SCell of the UE is initialized according to the indication of the base station.
- step S50 the base station transmits an RRC reconfiguration message to the terminal.
- the SCell may be added by the RRC reconfiguration message.
- step S51 the terminal transmits an RRC reconfiguration complete message to the base station in response to the RRC reconfiguration message.
- step S52 the base station needs activation of the added SCell.
- step S53 the base station transmits an SCell activation message to the terminal.
- step S54 the UE transmits an HARQ ACK message for the SCell activation message.
- step S55 the base station initializes a random access procedure for the SCell.
- step S56 the base station transmits a PDCCH indication to the terminal.
- step S57 a random access process for the SCell between the terminal and the base station is performed.
- step S58 the terminal adjusts the UL transmission timing after completing the random access process, and transmits data to the base station.
- the SCell may be extended to an extended carrier. That is, in the above description, the SCell may be replaced with a UL extended carrier.
- a specific UL extension carrier is added, when the added specific UL extension carrier is activated, or according to an indication of the base station, a random access procedure for the UL extension carrier of the terminal may be initialized.
- the base station may inform the terminal to initialize the random access procedure in various ways. For example, the base station may inform the terminal to initialize the random access procedure through a specific field in the RRC message used when adding the UL extended carrier or through a separate RRC message.
- the base station may inform the terminal to initialize the random access process through a specific field in the MAC message used to activate the added UL extended carrier or through a separate MAC message.
- whether or not cross-carrier scheduling for the UL extended carrier may be indicated by a higher layer, or the system may be configured to always be performed without explicit indication.
- FIG. 9 illustrates an embodiment of a general random access procedure.
- the random access process may be divided into a contention-based random access process and a non-contention based random access process.
- the random access procedure for the above-described SCell may be performed through one or more predetermined methods among two random access procedures.
- step S61 the UE transmits a random access preamble to the base station.
- the random access preamble may be called a PRACH preamble.
- the random access preamble may be referred to as a first message in the random access procedure.
- step S62 the base station transmits a random access response to the terminal in response to the random access preamble.
- the random access preamble may be called a RACH response.
- the random access response may be called a second message in the random access procedure.
- step S63 the terminal performs the scheduled transmission to the base station.
- the scheduled transmission may be called a third message in the random access procedure.
- step S64 the base station performs a contention resolution message to the terminal.
- the conflict resolution message may be called a fourth message during the random access process.
- step S70 the base station allocates a random access preamble to the terminal.
- step S71 the terminal transmits a first message to the base station.
- step S72 the base station transmits a second message to the terminal in response to the first message.
- the transmit power of the PRACH preamble may be determined by estimating a pathloss of the PCell. Equation 1 shows an example of an equation for determining the transmission power of the PRACH preamble.
- P PRACH min ⁇ P CAMX, c (i), PREAMBLE_RECEIVED_TARGET_POWER + PLc ⁇ [dBm]
- Equation 1 P CAMX, c (i) represents the transmission power of the configured terminal defined for subframe i of the PCell, and PL C represents an estimated value of the DL path loss calculated at the terminal for the PCell.
- a random access procedure may be performed on the SCell to obtain a plurality of UL transmission timings.
- a new method for determining the transmit power of the PRACH preamble transmitted by the SCell is required.
- a method of determining the transmit power of the PRACH preamble proposed by the present invention will be described.
- the contention-based random access process will be described as an example, but the present invention is not limited thereto, and the present invention may be equally applied to the contention-free random access process.
- the transmission power of the PRACH preamble may be determined by estimating the path loss of the SCell through which the PRACH preamble is transmitted. That is, the path loss used to determine the transmit power of the PRACH preamble may be the path loss of the DL CC connected to the UL CC in the SCell to which the PRACH preamble is transmitted. Equation 2 shows an example of equations for determining the transmit power of the PRACH preamble according to the proposed PRACH preamble transmit power determination method.
- P PRACH min ⁇ P CAMX, c (i), PREAMBLE_RECEIVED_TARGET_POWER + PLc ⁇ [dBm]
- Equation 2 has the same form as in Equation 1, but in Equation 2, PL C represents an estimated value of the DL path loss calculated by the terminal with respect to the DL CC connected to the UL CC in the SCell.
- the transmission power of the PRACH preamble may be determined by the difference between the path loss of the PCell and the path loss of the SCell through which the PRACH preamble is transmitted.
- Equation 3 shows another example of the equation for determining the transmit power of the PRACH preamble according to the proposed PRACH preamble transmit power determination method.
- P PRACH min ⁇ P CAMX, c (i), PREAMBLE_RECEIVED_TARGET_POWER + PLc + PL diff ⁇ [dBm]
- Equation 3 P CAMX, c (i) is the transmission power of the configured terminal defined for the subframe i of the PCell, PL C is an estimate of the DL path loss calculated at the terminal for the PCell, PL diff is in the PCell and SCell It represents the difference between the DL path loss estimate calculated at the terminal for the UL CC and the SIB2 connected DL CC. PL diff is zero when the PRACH preamble is transmitted in the PCell.
- the base station signals the difference between the path loss of the PCell and the path loss of the SCell in which the PRACH preamble is transmitted to the terminal, and the terminal may determine the transmission power of the PRACH preamble using the terminal.
- the base station may transmit the difference between the path loss of the PCell and the path loss of the SCell to the terminal through any one of RRC signaling, MAC signaling, or PHY signaling.
- the difference between the path loss of the PCell and the path loss of the SCell may be broadcasted or unicasted. Since the base station already serves the terminals supporting the CA, it is possible to estimate the difference in the UL transmit power between the PCell and a specific SCell. Equation 4 shows another example of the equation for determining the transmit power of the PRACH preamble according to the proposed PRACH preamble transmit power determination method.
- P PRACH min ⁇ P CAMX, c (i), PREAMBLE_RECEIVED_TARGET_POWER + PLc + PL diff ⁇ [dBm]
- P CAMX, c (i) represents the transmission power of the configured terminal defined for subframe i of the PCell
- PL C represents an estimated value of the DL path loss calculated at the terminal for the PCell
- PL diff is a difference between the DL path loss estimate calculated at the terminal for the UL CC and the SIB2 connected DL CC in the PCell and the SCell, which is signaled from the base station.
- PL diff is zero when the PRACH preamble is transmitted in the PCell.
- the BS may inform the UE of the initialization of the random access procedure through the PDCCH indication. Therefore, the base station may signal the difference between the path loss of the PCell and the path loss of the SCell through the PDCCH indication.
- the PDCCH indication may be transmitted through a PCell or may be transmitted through an SCell performing a random access procedure.
- the present invention is not limited thereto.
- the base station may instruct the terminal of the difference between the path loss of the PCell and the path loss of the SCell by using a specific field in the DCI format transmitted through the PDCCH. Since the base station already serves the terminals supporting the CA, it is possible to estimate the difference in the UL transmit power between the PCell and a specific SCell.
- DCI format 1A may refer to section 5.3.3.1.3 of 3GPP TS 36.212 V10.2.0 (2011-06).
- a specific field indicates information for the PRACH, and the remaining bits are filled with zeros.
- DCI format 1A is a CIF, DCI format 0 / 1A differentiation flag, localized / distributed VRB.
- the CIF may be included in the DCI format 1A only when cross-carrier scheduling is indicated by an upper layer and the DCI format 1A is transmitted in a UE-specific search space (USS).
- UFS UE-specific search space
- CIF is not included in DCI format 1A.
- the base station may instruct the terminal of the difference between the path loss of the PCell and the path loss of the SCell through the DCI format 1A.
- DCI format 1A is used for the random access procedure initialized by the PDCCH indication, extra bits such as a HARQ process number and a DL allocation index are generated.
- the base station may inform the terminal of the difference between the path loss of the PCell and the path loss of the SCell through the remaining bits.
- Equation 5 shows another example of equations for determining the transmit power of the PRACH preamble according to the proposed PRACH preamble transmit power determination method.
- P PRACH min ⁇ P CAMX, c (i), PREAMBLE_RECEIVED_TARGET_POWER + PLc + PL diff ⁇ [dBm]
- P CAMX, c (i) represents the transmission power of the configured terminal defined for subframe i of the PCell
- PL C represents an estimated value of the DL path loss calculated at the terminal for the PCell
- PL diff is a difference between the DL path loss estimate calculated at the UE for the UL CC and the SIB2 connected DL CC in the PCell and the SCell, which is signaled by the PDCCH indication from the base station.
- PL diff is zero when the PRACH preamble is transmitted in the PCell.
- DCI format 1A may include PL diff .
- FIG. 10 shows an embodiment of a method for determining the transmit power of the proposed preamble.
- step S100 the UE estimates a DL path loss for a DL CC in the SCell.
- step S110 the UE determines the transmit power of the PRACH preamble based on the DL path loss.
- the transmit power of the PRACH preamble may be determined by Equations 2 to 5 described above.
- step S120 the terminal transmits the PRACH preamble to the base station based on the determined transmission power.
- the SCell includes only one cell, but this is for convenience and the present invention is not limited thereto. That is, in the above description, the SCell may be one cell group including one or more cells except the PCell. Similarly, the PCell may be one cell group including a cell different from the PCell.
- the transmission power determination method of the PRACH preamble described above is possible even when the UL extension carrier is defined. Since the UL extension carrier does not have a DL CC in the SIB2 connection relationship, in order to determine the transmission power of the PRACH preamble according to Equations 2 to 5, it is necessary to set the DL CC associated with the UL extension carrier in a different manner. In addition, since there is no DL CC having a SIB connection relationship with the UL extension carrier, cross carrier scheduling should always be performed.
- the UL extension carrier is defined, a method of setting a DL CC associated with the UL extension carrier will be described.
- a DL CC that is virtually linked with an UL extended carrier may be indicated by a base station from a higher layer.
- the base station may indicate a DL CC that is virtually connected to the UL extension carrier through RRC signaling or MAC signaling.
- a physical layer identifier including a DL CC virtually connected to an UL extension carrier may be indicated through a 'PhysCellID', which is an RRC parameter indicating a physical layer identity of a cell.
- a new RRC parameter indicating a DL CC virtually connected to the UL extension carrier may be defined.
- the DL CC virtually connected to the UL extension carrier may be indicated through a MAC message or an RRC message activating the corresponding UL extension carrier.
- the DL CC virtually connected to the UL extension carrier may be indicated through a MAC message or an RRC message for adding or modifying the corresponding UL extension carrier.
- Cell groups may be defined for supporting different UL transmission timings between cells and / or for supporting different TDD UL / DL configurations between cells.
- a cell group When a cell group is defined to support different UL transmission timings between cells, cells belonging to one cell group may have the same UL transmission timing.
- cells belonging to one cell group when a cell group is defined to support different TDD UL / DL configurations between cells, cells belonging to one cell group may have the same TDD UL / DL configuration.
- a virtual connection with the UL extension carrier may be defined.
- the DL CC virtually connected to the UL extension carrier may always be determined by a predetermined rule.
- the UL extended carrier may be set to always have a virtual connection with the DL CC in the PCell.
- the UL extended carrier may be configured to be virtually connected to the DL CC in the cell having the smallest cell index among the cells.
- the UL extension carrier may be configured to be virtually connected to the DL CC in the cell having the smallest cell index among the activated cells. Even when the cell group is defined, the DL CC in which the UL extension carrier and the virtual connection in the cell group are defined may be predetermined.
- FIG. 11 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
- the base station 800 includes a processor 810, a memory 820, and an RF unit 830.
- Processor 810 implements the proposed functions, processes, and / or methods. Layers of the air interface protocol may be implemented by the processor 810.
- the memory 820 is connected to the processor 810 and stores various information for driving the processor 810.
- the RF unit 830 is connected to the processor 810 to transmit and / or receive a radio signal.
- the terminal 900 includes a processor 910, a memory 920, and an RF unit 930.
- Processor 910 implements the proposed functions, processes, and / or methods. Layers of the air interface protocol may be implemented by the processor 910.
- the memory 920 is connected to the processor 910 and stores various information for driving the processor 910.
- the RF unit 930 is connected to the processor 910 to transmit and / or receive a radio signal.
- Processors 810 and 910 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory 820, 920 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device.
- the RF unit 830 and 930 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 the memory 820, 920 and executed by the processor 810, 910.
- the memories 820 and 920 may be inside or outside the processors 810 and 910, and may be connected to the processors 810 and 910 by various well-known means.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Databases & Information Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
EUTRA 동작 대역폭 |
UL 동작 대역폭 FUL_low - FUL_high |
DL 동작 대역폭 FDL_low - FDL_high |
듀플렉스 모드 |
1 | 1920 MHz - 1980 MHz | 2110 MHz - 2170 MHz | FDD |
2 | 1850 MHz - 1910 MHz | 1930 MHz - 1990 MHz | FDD |
3 | 1710 MHz - 1785 MHz | 1805 MHz - 1880 MHz | FDD |
4 | 1710 MHz - 1755 MHz | 2110 MHz - 2155 MHz | FDD |
5 | 824 MHz - 849 MHz | 869 MHz - 894MHz | FDD |
6 | 830 MHz - 840 MHz | 875 MHz - 885 MHz | FDD |
7 | 2500 MHz - 2570 MHz | 2620 MHz - 2690 MHz | FDD |
8 | 880 MHz - 915 MHz | 925 MHz - 960 MHz | FDD |
9 | 1749.9 MHz - 1784.9 MHz | 1844.9 MHz - 1879.9 MHz | FDD |
10 | 1710 MHz - 1770 MHz | 2110 MHz - 2170 MHz | FDD |
11 | 1427.9 MHz - 1447.9 MHz | 1475.9 MHz - 1495.9 MHz | FDD |
12 | 698 MHz - 716 MHz | 728 MHz - 746 MHz | FDD |
13 | 777 MHz - 787 MHz | 746 MHz - 756 MHz | FDD |
14 | 788 MHz - 798 MHz | 758 MHz - 768 MHz | FDD |
15 | Reserved | Reserved | FDD |
16 | Reserved | Reserved | FDD |
17 | 704 MHz - 716 MHz | 734 MHz - 746 MHz | FDD |
18 | 815 MHz - 830 MHz | 860 MHz - 875 MHz | FDD |
19 | 830 MHz - 845 MHz | 875 MHz - 890 MHz | FDD |
20 | 832 MHz - 862 MHz | 791 MHz - 821 MHz | |
21 | 1447.9 MHz - 1462.9 MHz | 1495.9 MHz - 1510.9 MHz | FDD |
... | |||
33 | 1900 MHz - 1920 MHz | 1900 MHz - 1920 MHz | TDD |
34 | 2010 MHz - 2025 MHz | 2010 MHz - 2025 MHz | TDD |
35 | 1850 MHz - 1910 MHz | 1850 MHz - 1910 MHz | TDD |
36 | 1930 MHz - 1990 MHz | 1930 MHz - 1990 MHz | TDD |
37 | 1910 MHz - 1930 MHz | 1910 MHz - 1930 MHz | TDD |
38 | 2570 MHz - 2620 MHz | 2570 MHz - 2620 MHz | TDD |
39 | 1880 MHz - 1920 MHz | 1880 MHz - 1920 MHz | TDD |
40 | 2300 MHz - 2400 MHz | 2300 MHz - 2400 MHz | TDD |
41 | 2496 MHz - 2690 MHz | 2496 MHz - 2690 MHz | TDD |
Claims (15)
- 무선 통신 시스템에서 단말(UE; user equipment)에 의한 프리앰블(preamble)의 전송 전력을 결정하는 방법에 있어서,
2차 셀(SCell; secondary cell) 내의 상향링크(UL; uplink) 구성 반송파(CC; component carrier)와 연결(linkage) 관계에 있는 하향링크(DL; downlink) CC에 대하여 SCell 경로 손실(pathloss)을 추정하고,
상기 추정된 Scell 경로 손실을 기반으로 PRACH(physical random access channel) 프리앰블의 전송 전력을 결정하고,
상기 결정된 전송 전력을 기반으로 상기 PRACH 프리앰블을 상기 SCell 내의 UL CC를 통해 기지국으로 전송하는 것을 포함하되,
상기 SCell과 1차 셀(PCell; primary cell)은 반송파 집합(CA; carrier aggregation system)을 구성하고,
상기 PCell은 상기 단말이 상기 기지국과 RRC(radio resource control) 연결을 수행하는 셀이며,
상기 Scell은 상기 반송파 집합에서 상기 PCell을 제외한 나머지 셀 중 적어도 하나의 셀인 것을 특징으로 하는 방법. - 제 1 항에 있어서,
상기 DL CC는 상기 SCell 내의 UL CC와 SIB2(SystemInformationBlockType2) 연결 관계에 있는 것을 특징으로 하는 방법. - 제 1 항에 있어서,
상기 PRACH 프리앰블의 전송 전력은 아래의 수학식에 의해 결정되는 것을 특징으로 하는 방법.
PPRACH=min {PCAMX,c(i), REAMBLE_RECEIVED_TARGET_POWER+PLc} [dBm]
단, PCAMX,c(i)는 상기 PCell의 서브프레임 i에 대하여 정의된 구성된 상기 단말의 전송 전력, PLC는 상기 추정된 SCell 경로 손실을 나타낸다. - 제 1 항에 있어서,
상기 PRACH 프리앰블의 전송 전력은 상기 PCell의 경로 손실과 상기 추정된 SCell 경로 손실의 차이값을 기반으로 결정되는 것을 특징으로 하는 방법. - 제 4 항에 있어서,
상기 PRACH 프리앰블의 전송 전력은 아래의 수학식에 의해 결정되는 것을 특징으로 하는 방법.
PPRACH=min {PCAMX,c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc+PLdiff} [dBm]
단, PCAMX,c(i)는 상기 PCell의 서브프레임 i에 대하여 정의된 구성된 상기 단말의 전송 전력, PLC는 상기 PCell의 경로 손실, PLdiff는 상기 PCell의 경로 손실과 상기 추정된 Scell 경로 손실의 차이값을 나타낸다. - 제 4 항에 있어서,
상기 PCell의 경로 손실과 상기 추정된 SCell 경로 손실의 차이값은 기지국으로부터 수신되는 것을 특징으로 하는 방법. - 제 6 항에 있어서,
상기 PCell의 경로 손실과 상기 추정된 SCell 경로 손실의 차이값은 기지국으로부터 RRC(radio resource control) 계층, MAC(media access control) 계층 또는 PHY(physical) 계층 중 어느 하나를 통해 수신되는 것을 특징으로 하는 방법. - 제 6 항에 있어서,
상기 PCell의 경로 손실과 상기 추정된 SCell 경로 손실의 차이값은 기지국으로부터 PDCCH(physical downlink control channel) 지시(order)를 통해 수신되는 것을 특징으로 하는 방법. - 제 8 항에 있어서,
상기 PCell의 경로 손실과 상기 추정된 SCell 경로 손실의 차이값은 DCI(downlink control information) 포맷 1A에 포함되어 기지국으로부터 PDCCH 지시를 통해 수신되는 것을 특징으로 하는 방법. - 제 1 항에 있어서,
상기 SCell 내의 UL CC는 단일(stand-alone) 반송파로 동작할 수 없는 UL 확장 반송파(extension carrier)인 것을 특징으로 하는 방법. - 제 10 항에 있어서,
상기 DL CC는 UL 확장 반송파와 가상(virtual) 연결 관계에 있는 DL CC인 것을 특징으로 하는 방법. - 제 11 항에 있어서,
상기 UL 확장 반송파와 가상 연결 관계에 있는 상기 DL CC는 상위 계층(higher layer)를 통해 기지국에 의해 지시되는 것을 특징으로 하는 방법. - 제 11 항에 있어서,
상기 UL 확장 반송파와 가상 연결 관계에 있는 상기 DL CC는 미리 결정되는 것을 특징으로 하는 방법. - 제 1 항에 있어서,
상기 PCell은 RRC 설정(establishment), RRC 재설정(re-establishmenet) 또는 핸드오버(handover) 시에 NAS(non-access stratum) 이동성 정보(mobility information) 및 보안 입력(security input) 중 적어도 하나를 제공하는 셀인 것을 특징으로 하는 방법. - 무선 통신 시스템에서 프리앰블(preamble)의 전송 전력을 결정하는 단말에 있어서,
무선 신호를 전송 또는 수신하는 RF(Radio frequency)부; 및
상기 RF부와 연결되는 프로세서를 포함하되,
상기 프로세서는,
2차 셀(SCell; secondary cell) 내의 상향링크(UL; uplink) 구성 반송파(CC; component carrier)와 연결(linkage) 관계에 있는 하향링크(DL; downlink) CC에 대하여 SCell 경로 손실(pathloss)을 추정하고,
상기 추정된 Scell 경로 손실을 기반으로 PRACH(physical random access channel) 프리앰블의 전송 전력을 결정하고,
상기 결정된 전송 전력을 기반으로 상기 PRACH 프리앰블을 상기 SCell 내의 UL CC를 통해 기지국으로 전송하도록 구성되며,
상기 SCell과 1차 셀(PCell; primary cell)은 반송파 집합(CA; carrier aggregation system)을 구성하고,
상기 PCell은 상기 단말이 상기 기지국과 RRC(radio resource control) 연결을 수행하는 셀이며,
상기 Scell은 상기 반송파 집합에서 상기 PCell을 제외한 나머지 셀 중 적어도 하나의 셀인 것을 특징으로 하는 단말.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/130,650 US9294940B2 (en) | 2011-07-11 | 2012-07-09 | Method and apparatus for determining transmission power of preamble in wireless communication system |
EP12811362.8A EP2733873B1 (en) | 2011-07-11 | 2012-07-09 | Method and apparatus for determining transmission power of preamble in wireless communication system |
KR1020147000503A KR102070012B1 (ko) | 2011-07-11 | 2012-07-09 | 무선 통신 시스템에서 프리앰블의 전송 전력을 결정하는 방법 및 장치 |
CN201280034353.2A CN103650394B (zh) | 2011-07-11 | 2012-07-09 | 确定无线通信系统中的前同步码的发送功率的方法和设备 |
KR1020207001719A KR20200010587A (ko) | 2011-07-11 | 2012-07-09 | 무선 통신 시스템에서 프리앰블의 전송 전력을 결정하는 방법 및 장치 |
KR1020217015616A KR102470963B1 (ko) | 2011-07-11 | 2012-07-09 | 무선 통신 시스템에서 프리앰블의 전송 전력을 결정하는 방법 및 장치 |
US15/016,621 US9674843B2 (en) | 2011-07-11 | 2016-02-05 | Method and apparatus for determining transmission power of preamble in wireless communication system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201161506623P | 2011-07-11 | 2011-07-11 | |
US61/506,623 | 2011-07-11 | ||
US201161522253P | 2011-08-11 | 2011-08-11 | |
US61/522,253 | 2011-08-11 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/130,650 A-371-Of-International US9294940B2 (en) | 2011-07-11 | 2012-07-09 | Method and apparatus for determining transmission power of preamble in wireless communication system |
US15/016,621 Continuation US9674843B2 (en) | 2011-07-11 | 2016-02-05 | Method and apparatus for determining transmission power of preamble in wireless communication system |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2013009052A2 true WO2013009052A2 (ko) | 2013-01-17 |
WO2013009052A3 WO2013009052A3 (ko) | 2013-03-14 |
Family
ID=47506678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2012/005406 WO2013009052A2 (ko) | 2011-07-11 | 2012-07-09 | 무선 통신 시스템에서 프리앰블의 전송 전력을 결정하는 방법 및 장치 |
Country Status (5)
Country | Link |
---|---|
US (2) | US9294940B2 (ko) |
EP (1) | EP2733873B1 (ko) |
KR (3) | KR102470963B1 (ko) |
CN (1) | CN103650394B (ko) |
WO (1) | WO2013009052A2 (ko) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2506749A (en) * | 2012-08-30 | 2014-04-09 | Zte Wistron Telecom Ab | Adjusting the power level of an initial preamble signal transmission using a calculated path loss difference in a heterogeneous network |
WO2016129970A1 (ko) * | 2015-02-15 | 2016-08-18 | 엘지전자 주식회사 | 무선 통신 시스템에서 다중 경로 채널에 의한 rach 프리앰블의 충돌을 검출하는 방법 및 장치 |
US9936373B2 (en) | 2013-09-25 | 2018-04-03 | Zte Wistron Telecom Ab | Discovery signals in heterogeneous wireless networks |
CN110089188A (zh) * | 2016-12-19 | 2019-08-02 | 高通股份有限公司 | 随机接入消息传输和重传期间的上行链路传输参数选择 |
US10499258B2 (en) | 2013-05-08 | 2019-12-03 | Zte Wistron Telecom Ab | Using a geometry indicator in HetNet deployments |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013009052A2 (ko) * | 2011-07-11 | 2013-01-17 | 엘지전자 주식회사 | 무선 통신 시스템에서 프리앰블의 전송 전력을 결정하는 방법 및 장치 |
JP5927801B2 (ja) * | 2011-08-02 | 2016-06-01 | シャープ株式会社 | 基地局、端末および通信方法 |
JP2013034111A (ja) | 2011-08-02 | 2013-02-14 | Sharp Corp | 基地局、端末、通信システムおよび通信方法 |
JP5927802B2 (ja) | 2011-08-02 | 2016-06-01 | シャープ株式会社 | 基地局、端末および通信方法 |
CN105873204B (zh) * | 2011-10-09 | 2019-12-17 | 华为技术有限公司 | 上行发送功率确定方法及用户设备 |
US8879518B2 (en) | 2012-02-08 | 2014-11-04 | Acer Incorporated | Method of timing reference management |
US9131516B2 (en) * | 2012-03-30 | 2015-09-08 | Acer Incorporated | Method of preventing random access response collision |
KR102036298B1 (ko) * | 2013-01-21 | 2019-10-24 | 삼성전자 주식회사 | Tdd을 지원하는 이동통신 시스템에서 tdd 설정 정보를 단말에게 효과적으로 제공하고 상향링크 전송 타이밍을 결정하기 위한 방법 및 장치 |
CN105704762A (zh) * | 2014-11-26 | 2016-06-22 | 电信科学技术研究院 | 一种移动通信方法、设备及系统 |
JPWO2016159230A1 (ja) * | 2015-04-02 | 2018-02-01 | 株式会社Nttドコモ | ユーザ端末、無線基地局及び無線通信方法 |
US9844012B2 (en) * | 2015-08-13 | 2017-12-12 | Intel IP Corporation | Automatic gain control gain adjustment |
US10111255B2 (en) * | 2016-05-16 | 2018-10-23 | Qualcomm Incorporated | Beam and symbol selection to transmit RACH |
US11647471B2 (en) * | 2017-06-15 | 2023-05-09 | Nec Corporation | Methods and devices for physical random access channel power control |
US10849076B2 (en) * | 2017-06-26 | 2020-11-24 | Mediatek Inc. | Physical random access channel preamble retransmission for NR |
KR102305906B1 (ko) | 2017-08-10 | 2021-09-28 | 삼성전자 주식회사 | 무선 통신 시스템에서 상향링크 전송 방법 및 장치 |
US10779331B2 (en) | 2017-08-21 | 2020-09-15 | Qualcomm Incorporated | Random access channel (RACH) transmission with cross-band downlink/uplink (DL/UL) pairing |
US11109236B2 (en) * | 2017-11-09 | 2021-08-31 | Qualcomm Incorporated | Techniques for carrier feedback in wireless systems |
US10880867B2 (en) * | 2017-11-17 | 2020-12-29 | Qualcomm Incorporated | Selecting a new radio uplink resource to transmit a random access procedure communication |
CN110808818B (zh) * | 2018-08-06 | 2021-06-22 | 维沃移动通信有限公司 | 用于用户设备之间通信的方法和用户设备 |
US11463963B2 (en) | 2019-01-10 | 2022-10-04 | Qualcomm Incorporated | Path loss estimation |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7302276B2 (en) | 2003-11-25 | 2007-11-27 | Telefonaktiebolaget L M Ericsson (Publ) | Method and system for determining uplink/downlink path-loss difference |
US8718694B2 (en) * | 2007-12-07 | 2014-05-06 | Interdigital Patent Holdings, Inc. | Method and apparatus of signaling and procedure to support uplink power level determination |
US8385966B2 (en) * | 2008-05-05 | 2013-02-26 | Nokia Siemens Networks Oy | Method, apparatus and computer program for power control related to random access procedures |
CN102160431A (zh) * | 2008-09-22 | 2011-08-17 | 株式会社Ntt都科摩 | 移动台和无线基站 |
CN101938773B (zh) * | 2009-06-30 | 2014-11-05 | 中兴通讯股份有限公司 | 初始发射功率获取方法、基站 |
EP3442154B1 (en) * | 2011-05-02 | 2020-04-01 | Telefonaktiebolaget LM Ericsson (publ) | Method and apparatus for prohibiting sounding reference signal transmission on newly activated secondary cells in a wireless communication system |
TW201731266A (zh) * | 2011-05-10 | 2017-09-01 | 內數位專利控股公司 | 獲德次胞元上鏈定時校準方法及裝置 |
JP5331161B2 (ja) * | 2011-05-19 | 2013-10-30 | シャープ株式会社 | 無線通信システム、基地局装置、移動局装置、無線通信方法および集積回路 |
WO2012173570A1 (en) * | 2011-06-17 | 2012-12-20 | Telefonaktiebolaget L M Ericsson (Publ) | A wireless device, a network node and methods therein |
US20130010711A1 (en) * | 2011-07-06 | 2013-01-10 | Daniel Larsson | Random Access with Primary and Secondary Component Carrier Communications |
WO2013009052A2 (ko) * | 2011-07-11 | 2013-01-17 | 엘지전자 주식회사 | 무선 통신 시스템에서 프리앰블의 전송 전력을 결정하는 방법 및 장치 |
-
2012
- 2012-07-09 WO PCT/KR2012/005406 patent/WO2013009052A2/ko active Application Filing
- 2012-07-09 EP EP12811362.8A patent/EP2733873B1/en active Active
- 2012-07-09 US US14/130,650 patent/US9294940B2/en active Active
- 2012-07-09 KR KR1020217015616A patent/KR102470963B1/ko active IP Right Grant
- 2012-07-09 CN CN201280034353.2A patent/CN103650394B/zh active Active
- 2012-07-09 KR KR1020147000503A patent/KR102070012B1/ko active IP Right Grant
- 2012-07-09 KR KR1020207001719A patent/KR20200010587A/ko active Application Filing
-
2016
- 2016-02-05 US US15/016,621 patent/US9674843B2/en active Active
Non-Patent Citations (3)
Title |
---|
"Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 8", 3GPP (3RD GENERATION PARTNERSHIP PROJECT) TS 36.211 V8.2.0, March 2008 (2008-03-01) |
3GPP TS 36.212 V10.2.0, June 2011 (2011-06-01) |
See also references of EP2733873A4 |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2506749A (en) * | 2012-08-30 | 2014-04-09 | Zte Wistron Telecom Ab | Adjusting the power level of an initial preamble signal transmission using a calculated path loss difference in a heterogeneous network |
GB2506749B (en) * | 2012-08-30 | 2014-12-17 | Zte Wistron Telecom Ab | Methods and apparatus for using a geometry indicator in hetnet deployments |
US9258786B2 (en) | 2012-08-30 | 2016-02-09 | Zte Wistron Telecom Ab | Methods and apparatus for using a geometry indicator in hetnet deployments |
US10499258B2 (en) | 2013-05-08 | 2019-12-03 | Zte Wistron Telecom Ab | Using a geometry indicator in HetNet deployments |
US9936373B2 (en) | 2013-09-25 | 2018-04-03 | Zte Wistron Telecom Ab | Discovery signals in heterogeneous wireless networks |
WO2016129970A1 (ko) * | 2015-02-15 | 2016-08-18 | 엘지전자 주식회사 | 무선 통신 시스템에서 다중 경로 채널에 의한 rach 프리앰블의 충돌을 검출하는 방법 및 장치 |
US10299292B2 (en) | 2015-02-15 | 2019-05-21 | Lg Electronics Inc. | Method and device for detecting RACH preamble collision caused by multi-path channel in wireless communication system |
CN110089188A (zh) * | 2016-12-19 | 2019-08-02 | 高通股份有限公司 | 随机接入消息传输和重传期间的上行链路传输参数选择 |
CN110089188B (zh) * | 2016-12-19 | 2023-06-13 | 高通股份有限公司 | 用于上行链路传输参数选择的方法和设备 |
Also Published As
Publication number | Publication date |
---|---|
KR20200010587A (ko) | 2020-01-30 |
US9294940B2 (en) | 2016-03-22 |
KR102070012B1 (ko) | 2020-03-02 |
CN103650394B (zh) | 2017-03-01 |
KR102470963B1 (ko) | 2022-11-25 |
EP2733873B1 (en) | 2016-09-14 |
EP2733873A2 (en) | 2014-05-21 |
US20140133337A1 (en) | 2014-05-15 |
US9674843B2 (en) | 2017-06-06 |
KR20210063470A (ko) | 2021-06-01 |
WO2013009052A3 (ko) | 2013-03-14 |
KR20140044360A (ko) | 2014-04-14 |
US20160157238A1 (en) | 2016-06-02 |
EP2733873A4 (en) | 2015-03-25 |
CN103650394A (zh) | 2014-03-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR102070012B1 (ko) | 무선 통신 시스템에서 프리앰블의 전송 전력을 결정하는 방법 및 장치 | |
US10327266B2 (en) | Method for performing random access procedure | |
WO2013009068A2 (ko) | 무선 통신 시스템에서 랜덤 액세스를 수행하는 방법 및 장치 | |
EP2763338B1 (en) | Method and apparatus for transmitting channel state information in wireless communication system | |
US10462771B2 (en) | Receiving method and user device in small-scale cell | |
US10862607B2 (en) | Method for transceiving shortened physical downlink shared channel in wireless access system supporting unlicensed band, and device supporting same | |
US9130723B2 (en) | Method and device for acquiring resource for uplink control channel in wireless communication system | |
US10020971B2 (en) | Method and user equipment for transreceiving TDD | |
US9014130B2 (en) | Method and apparatus for transmitting control information through uplink | |
EP3079431A1 (en) | Method and mtc device for performing random access procedure for coverage enhancement | |
WO2011108906A2 (ko) | 무선 통신 시스템에서 비주기적 사운딩 참조 신호 전송 방법 및 장치 | |
CN111096045A (zh) | 在无线通信系统中执行初始接入的方法及其设备 | |
US10004047B2 (en) | Method for performing power control for uplink transmission and user equipment | |
EP3190760B1 (en) | Method for receiving data from amorphous mimic cell and terminal thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12811362 Country of ref document: EP Kind code of ref document: A2 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14130650 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 20147000503 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REEP | Request for entry into the european phase |
Ref document number: 2012811362 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012811362 Country of ref document: EP |