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WO2013048170A2 - Procédé et appareil d'émission en liaison montante - Google Patents

Procédé et appareil d'émission en liaison montante Download PDF

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Publication number
WO2013048170A2
WO2013048170A2 PCT/KR2012/007887 KR2012007887W WO2013048170A2 WO 2013048170 A2 WO2013048170 A2 WO 2013048170A2 KR 2012007887 W KR2012007887 W KR 2012007887W WO 2013048170 A2 WO2013048170 A2 WO 2013048170A2
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WO
WIPO (PCT)
Prior art keywords
srs
serving cell
group
transmission
uplink
Prior art date
Application number
PCT/KR2012/007887
Other languages
English (en)
Korean (ko)
Other versions
WO2013048170A3 (fr
Inventor
안준기
양석철
이윤정
서동연
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020120108364A external-priority patent/KR101306377B1/ko
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to US14/112,209 priority Critical patent/US8948119B2/en
Publication of WO2013048170A2 publication Critical patent/WO2013048170A2/fr
Publication of WO2013048170A3 publication Critical patent/WO2013048170A3/fr
Priority to US14/539,810 priority patent/US9344242B2/en
Priority to US15/097,657 priority patent/US9742539B2/en
Priority to US15/656,405 priority patent/US9991999B2/en

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    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for uplink transmission in a wireless communication system.
  • 3GPP LTE long term evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink and single carrier-frequency division multiple access (SC-FDMA) in uplink.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • MIMO multiple input multiple output
  • LTE-A 3GPP LTE-Advanced
  • a physical channel is a downlink channel. It may be divided into a Physical Downlink Shared Channel (PDSCH), a Physical Downlink Control Channel (PDCCH), a Physical Uplink Shared Channel (PUSCH) and a Physical Uplink Control Channel (PUCCH) which are uplink channels.
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • the terminal may be located in any region within the cell, and the arrival time until the uplink signal transmitted by the terminal reaches the base station may vary depending on the position of each terminal.
  • the arrival time of the terminal located at the cell edge is longer than the arrival time of the terminal located at the cell center. In contrast, the arrival time of the terminal located at the cell center is shorter than the arrival time of the terminal located at the cell edge.
  • the base station In order to reduce interference between terminals, the base station needs to schedule the uplink signals transmitted by the terminals in the cell to be received within a boundary (hourly) every time.
  • the base station must adjust the transmission timing of each terminal according to the situation of each terminal, this adjustment is called uplink time alignment (uplink time alignment).
  • the random access process is one of processes for maintaining uplink time synchronization.
  • the UE acquires a time alignment value (or TA) through a random access procedure and maintains uplink time synchronization by applying a time synchronization value.
  • uplink transmission is designed considering only the same time synchronization value. Since serving cells having different propagation characteristics may be allocated, it is necessary to design uplink transmission in consideration of having different time synchronization values between cells.
  • the present invention provides a method for uplink transmission between a plurality of tim advance (TA) groups and a wireless device using the same.
  • TA tim advance
  • the uplink transmission method includes transmitting a random access preamble through a first radio resource in a first serving cell and transmitting an uplink channel through a second radio resource in a second serving cell,
  • the first serving cell belongs to a first TA group
  • the second serving cell belongs to a second TA group different from the first TA group
  • the first radio resource and the second radio resource are all or Some overlap.
  • the total transmission power may not exceed the set maximum transmission power.
  • the uplink channel may include at least one of a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a sounding reference signal (SRS).
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • SRS sounding reference signal
  • a wireless device for uplink transmission includes a radio frequency (RF) unit for transmitting and receiving a radio signal, and a processor connected to the RF unit, wherein the processor is configured to perform a first radio resource in a first serving cell. Instruct the RF unit to transmit a random access preamble through the RF unit, and transmit the uplink channel through a second radio resource in a second serving cell, wherein the first serving cell is a first TA. Advance) group, the second serving cell belongs to a second TA group different from the first TA group, the first radio resources and the second radio resources are all or part of the overlap.
  • RF radio frequency
  • TA timing advance
  • 1 shows a structure of a downlink radio frame in 3GPP LTE.
  • FIG. 2 is a flowchart illustrating a random access procedure in 3GPP LTE.
  • 5 shows a UL propagation difference between a plurality of cells.
  • FIG. 6 illustrates an example in which TAs are changed between a plurality of cells.
  • 11 shows PUSCH and SRS transmission when a plurality of TA groups are configured.
  • FIG. 13 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
  • the wireless device may be fixed or mobile and may be called by other terms such as a user equipment (UE), a mobile station (MS), a user terminal (UT), a subscriber station (SS), and a mobile terminal (MT).
  • a base station generally refers to a fixed station for communicating with a wireless device, and may be referred to in other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like.
  • LTE includes LTE and / or LTE-A.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • R-UTRA Physical Channels and Modulation
  • the radio frame includes 10 subframes indexed from 0 to 9.
  • One subframe includes two consecutive slots.
  • the time it takes for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
  • One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain.
  • OFDM symbol is only for representing one symbol period in the time domain, since 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink (DL), multiple access scheme or name There is no limit on.
  • OFDM symbol may be called another name such as a single carrier-frequency division multiple access (SC-FDMA) symbol, a symbol period, and the like.
  • SC-FDMA single carrier-frequency division multiple access
  • One slot includes 7 OFDM symbols as an example, but the number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP).
  • CP cyclic prefix
  • a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 ⁇ 12 resource elements (REs). It may include.
  • the DL (downlink) subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
  • a physical downlink control channel (PDCCH) and another control channel are allocated to the control region, and a PDSCH is allocated to the data region.
  • PDCH physical downlink control channel
  • a physical channel is a physical downlink shared channel (PDSCH), a physical downlink shared channel (PUSCH), a physical downlink control channel (PDCCH), and a physical channel (PCFICH). It may be divided into a Control Format Indicator Channel (PHICH), a Physical Hybrid-ARQ Indicator Channel (PHICH), and a Physical Uplink Control Channel (PUCCH).
  • PDSCH physical downlink shared channel
  • PUSCH physical downlink shared channel
  • PDCCH physical downlink control channel
  • PCFICH physical channel
  • the PCFICH transmitted in the first OFDM symbol of a subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
  • CFI control format indicator
  • the terminal first receives the CFI on the PCFICH, and then monitors the PDCCH.
  • the PCFICH does not use blind decoding and is transmitted on a fixed PCFICH resource of a subframe.
  • the PHICH carries a positive-acknowledgement (ACK) / negative-acknowledgement (NACK) signal for an uplink hybrid automatic repeat request (HARQ).
  • ACK positive-acknowledgement
  • NACK negative-acknowledgement
  • HARQ uplink hybrid automatic repeat request
  • the ACK / NACK signal for uplink (UL) data on the PUSCH transmitted by the UE is transmitted on the PHICH.
  • the Physical Broadcast Channel (PBCH) is transmitted in the preceding four OFDM symbols of the second slot of the first subframe of the radio frame.
  • the PBCH carries system information necessary for the terminal to communicate with the base station, and the system information transmitted through the PBCH is called a master information block (MIB).
  • MIB master information block
  • SIB system information block
  • DCI downlink control information
  • PDSCH also called DL grant
  • PUSCH resource allocation also called UL grant
  • VoIP Voice over Internet Protocol
  • blind decoding is used to detect the PDCCH.
  • Blind decoding is a method of demasking a desired identifier in a CRC of a received PDCCH (which is called a candidate PDCCH) and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
  • the base station determines the PDCCH format according to the DCI to be sent to the terminal, attaches a cyclic redundancy check (CRC) to the DCI, and unique identifier according to the owner or purpose of the PDCCH (this is called a Radio Network Temporary Identifier) Mask to the CRC.
  • CRC cyclic redundancy check
  • the control region in the subframe includes a plurality of control channel elements (CCEs).
  • the CCE is a logical allocation unit used to provide a coding rate according to the state of a radio channel to a PDCCH and corresponds to a plurality of resource element groups (REGs).
  • the REG includes a plurality of resource elements.
  • 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.
  • One REG includes four REs and one CCE includes nine REGs.
  • ⁇ 1, 2, 4, 8 ⁇ CCEs may be used to configure one PDCCH, and each element of ⁇ 1, 2, 4, 8 ⁇ is called a CCE aggregation level.
  • the number of CCEs used for transmission of the PDDCH is determined by the base station according to the channel state. For example, one CCE may be used for PDCCH transmission for a UE having a good downlink channel state. Eight CCEs may be used for PDCCH transmission for a UE having a poor downlink channel state.
  • a control channel composed of one or more CCEs performs interleaving in units of REGs and is mapped to physical resources after a cyclic shift based on a cell ID.
  • the uplink channel includes a PUSCH, a PUCCH, a Sounding Reference Signal (SRS), and a Physical Random Access Channl (PRACH).
  • PUSCH PUSCH
  • PUCCH Physical Random Access Channl
  • SRS Sounding Reference Signal
  • PRACH Physical Random Access Channl
  • PUCCH supports multiple formats.
  • a PUCCH having a different number of bits per subframe may be used according to a modulation scheme dependent on the PUCCH format.
  • PUCCH format 1 is used for transmission of SR (Scheduling Request)
  • PUCCH format 1a / 1b is used for transmission of ACK / NACK signal for HARQ
  • PUCCH format 2 is used for transmission of CQI
  • PUCCH format 2a / 2b is used for CQI and Used for simultaneous transmission of ACK / NACK signals.
  • PUCCH format 1a / 1b is used when transmitting only the ACK / NACK signal in the subframe
  • PUCCH format 1 is used when the SR is transmitted alone.
  • PUCCH format 1 is used, and an ACK / NACK signal is modulated and transmitted on a resource allocated to the SR.
  • SRS sounding reference signal
  • SRS transmission may be divided into periodic SRS transmission and aperiodic SRS transmission.
  • Periodic SRS transmissions are sent in subframes triggered by periodic SRS configuration.
  • the periodic SRS configuration includes an SRS period and an SRS subframe offset. Given a periodic SRS configuration, the UE can transmit the SRS periodically in a subframe that satisfies the periodic SRS configuration.
  • Aperiodic SRS transmission transmits the SRS when the SRS request of the base station is detected.
  • the SRS configuration is given in advance.
  • the SRS configuration also includes an SRS period T SRS and an SRS subframe offset T Offset .
  • the SRS request for triggering aperiodic SRS transmission may be included in the DL grant or the UL grant on the PDCCH. For example, if the SRS request is 1 bit, '0' may indicate a negative SRS request and '1' may indicate a positive SRS request. If the SRS request is 2 bits, '00' indicates a negative SRS request and the rest indicates a positive SRS request, but one of a plurality of SRS settings for SRS transmission may be selected.
  • the SRS may be transmitted in the serving cell of the PDCCH in which the SRS request is detected. If the DL grant or UL grant includes a CI, the SRS may be sent in the serving cell indicated by the CI.
  • the subframe index k SRS ⁇ 0,1, .., 9 ⁇ within frame n f in FDD, and k SRS in TDD is defined in a predetermined table.
  • the subframe in which the SRS is transmitted is called an SRS subframe or a triggered subframe.
  • the SRS may be transmitted in a UE-specifically determined SRS subframe.
  • the position of the OFDM symbol in which the SRS is transmitted may be fixed.
  • the SRS may be transmitted in the last OFDM symbol of the SRS subframe.
  • the OFDM symbol transmitted through the SRS is called a sounding reference symbol.
  • the terminal may be located in any area within the cell, and the arrival time until the UL signal transmitted by the terminal reaches the base station may vary depending on the location of each terminal.
  • the arrival time of the terminal located at the cell edge is longer than the arrival time of the terminal located at the cell center. In contrast, the arrival time of the terminal located at the cell center is shorter than the arrival time of the terminal located at the cell edge.
  • the base station In order to reduce the interference between the terminals, the base station needs to schedule the UL signals transmitted by the terminals in the cell to be received within the boundary (hourly) every time.
  • the base station must adjust the transmission timing of each terminal according to the situation of each terminal, and this adjustment is called time synchronization maintenance.
  • the terminal transmits a random access preamble to the base station.
  • the base station calculates a time alignment value for speeding up or slowing the transmission timing of the terminal based on the received random access preamble.
  • the base station transmits a random access response including the calculated time synchronization value to the terminal.
  • the terminal updates the transmission timing by using the time synchronization value.
  • the base station receives a sounding reference signal from the terminal periodically or arbitrarily, calculates a time synchronization value of the terminal through the sounding reference signal, and provides a MAC CE (control) to the terminal. element).
  • the time synchronization value may be referred to as information that the base station sends to the terminal to maintain uplink time synchronization, and a timing alignment command indicates this information.
  • the transmission timing of the terminal is changed according to the speed and position of the terminal. Therefore, it is preferable that the time synchronization value received by the terminal be valid for a specific time.
  • the purpose of this is the Time Alignment Timer.
  • the time synchronization timer When the terminal updates the time synchronization after receiving the time synchronization value from the base station, the time synchronization timer starts or restarts.
  • the UE can transmit uplink only when the time synchronization timer is in operation.
  • the value of the time synchronization timer may be notified by the base station to the terminal through an RRC message such as system information or a radio bearer reconfiguration message.
  • the UE When the time synchronization timer expires or the time synchronization timer does not operate, the UE assumes that the time synchronization is not synchronized with the base station, and does not transmit any uplink signal except the random access preamble.
  • the random access procedure is used for the terminal to obtain UL synchronization with the base station or to be allocated UL radio resources.
  • the terminal receives a root index and a physical random access channel (PRACH) configuration index from the base station.
  • Each cell has 64 candidate random access preambles defined by a Zadoff-Chu (ZC) sequence, and the root index is a logical index for the UE to generate 64 candidate random access preambles.
  • ZC Zadoff-Chu
  • the PRACH configuration index indicates a specific subframe and a preamble format capable of transmitting the random access preamble.
  • the terminal transmits the randomly selected random access preamble to the base station (S110).
  • the terminal selects one of 64 candidate random access preambles.
  • the corresponding subframe is selected by the PRACH configuration index.
  • the terminal transmits the selected random access preamble in the selected subframe.
  • the base station receiving the random access preamble sends a random access response (RAR) to the terminal (S120).
  • RAR random access response
  • the random access response is detected in two steps. First, the UE detects a PDCCH masked with a random access-RNTI (RA-RNTI). The terminal receives a random access response in a medium access control (MAC) protocol data unit (PDU) on the PDSCH indicated by the detected PDCCH.
  • MAC medium access control
  • the random access response may include a TAC, a UL grant, and a temporary C-RNTI.
  • the TAC is information indicating a time synchronization value sent by the base station to the terminal to maintain UL time alignment.
  • the terminal updates the UL transmission timing by using the time synchronization value.
  • the time alignment timer (Time Alignment Timer) is started or restarted.
  • the UL grant includes UL resource allocation and transmit power command (TPC) used for transmission of a scheduling message described later.
  • TPC is used to determine the transmit power for the scheduled PUSCH.
  • the terminal transmits the scheduled message to the base station according to the UL grant in the random access response (S130).
  • the random access preamble is also referred to as an M1 message, a random access response as an M2 message, and a scheduled message as an M3 message.
  • the transmission power P PUSCH (i) for PUSCH transmission in subframe i is defined as follows.
  • P CMAX is the set terminal transmission power
  • M PUSCH (i) is the bandwidth of the PUSCH resource allocation in RB unit.
  • ⁇ (j) is a parameter given to the upper layer.
  • PL is a downlink path loss estimate calculated by the terminal.
  • ⁇ TF (i) is a terminal specific parameter.
  • f (i) is a terminal specific value obtained from the TPC.
  • the transmission power P PUCCH (i) for PUCCH transmission in subframe i is defined as follows.
  • P CMAX and PL are the same as Equation 1
  • P O_PUCCH (j) is a parameter configured by the sum of the cell-specific element P O_NOMINAL_PUCCH (j) and the terminal-specific element P O_UE_PUCCH (j) given in the upper layer.
  • h (n CQI , n HARQ ) is a value dependent on the PUCCH format.
  • ⁇ F_PUCCH (F) is a parameter given by an upper layer.
  • g (i) is a terminal specific value obtained from the TPC.
  • the transmit power P SRS (i) for SRS transmission in subframe i is defined as follows.
  • P CMAX, P O_PUSCH (j ), ⁇ (j), PL and f (i) is the same as equation 1, and, P SRS_OFFSET is the UE-specific parameters, M SRS is given in the upper layer shows the bandwidth for SRS transmission .
  • the 3GPP LTE system supports a case in which downlink bandwidth and uplink bandwidth are set differently, but this assumes one component carrier (CC).
  • the 3GPP LTE system supports up to 20MHz and may have different uplink and downlink bandwidths, but only one CC is supported for each of the uplink and the downlink.
  • Spectrum aggregation supports a plurality of CCs. For example, if five CCs are allocated as granularity in a carrier unit having a 20 MHz bandwidth, a bandwidth of up to 100 MHz may be supported.
  • One DL CC or a pair of UL CC and DL CC may correspond to one cell. Accordingly, it can be said that a terminal communicating with a base station through a plurality of DL CCs receives a service from a plurality of serving cells.
  • the number of DL CCs and UL CCs is not limited.
  • PDCCH and PDSCH are independently transmitted in each DL CC, and PUCCH and PUSCH are independently transmitted in each UL CC. Since three DL CC-UL CC pairs are defined, the UE may be provided with services from three serving cells.
  • the UE may monitor the PDCCH in the plurality of DL CCs and receive DL transport blocks simultaneously through the plurality of DL CCs.
  • the terminal may transmit a plurality of UL transport blocks simultaneously through the plurality of UL CCs.
  • Each serving cell may be identified through a cell index (CI).
  • the CI may be unique within the cell or may be terminal-specific.
  • CI 0, 1, 2 is assigned to the first to third serving cells is shown.
  • the serving cell may be divided into a primary cell (pcell) and a secondary cell (scell).
  • the primary cell is a cell that operates at the primary frequency and performs an initial connection establishment process, which is a terminal, initiates a connection reestablishment process, or is designated as a primary cell in a handover process.
  • the primary cell is also called a reference cell.
  • the secondary cell operates at the secondary frequency, can be established after the RRC connection is established, and can be used to provide additional radio resources. At least one primary cell is always configured, and the secondary cell may be added / modified / released by higher layer signaling (eg, RRC message).
  • the CI of the primary cell can be fixed.
  • the lowest CI may be designated as the CI of the primary cell.
  • the CI of the primary cell is 0, and the CI of the secondary cell is sequentially assigned from 1.
  • the UE may monitor the PDCCH through a plurality of serving cells. However, even if there are N serving cells, the base station can be configured to monitor the PDCCH for M (M ⁇ N) serving cells. In addition, the base station may be configured to preferentially monitor the PDCCH for L (L ⁇ M ⁇ N) serving cells.
  • TA Timing Alignment
  • a plurality of serving cells may be spaced apart in the frequency domain so that propagation characteristics may vary.
  • a remote radio header (RRH) and devices may be present in the area of the base station to expand coverage or to remove a coverage hole.
  • 5 shows a UL propagation difference between a plurality of cells.
  • the terminal is provided with services by the primary cell and the secondary cell.
  • the primary cell is serviced by a base station
  • the secondary cell is serviced by an RRH connected to the base station.
  • the propagation delay characteristic of the primary cell and the propagation delay characteristic of the secondary cell may be different due to the distance between the base station and the RRH, the processing time of the RRH, and the like.
  • FIG. 6 illustrates an example in which TAs are changed between a plurality of cells.
  • the actual TA of the primary cell is 'TA 1'
  • the actual TA of the secondary cell is 'TA 2'. Therefore, it is necessary to apply an independent TA for each serving cell.
  • a TA group includes one or more cells to which the same TA applies.
  • TA is applied to each TA group, and the time synchronization timer also operates for each TA group.
  • the first serving cell belongs to the first TA group
  • the second serving cell belongs to the second TA group.
  • the number of serving cells and TA groups is only an example.
  • the first serving cell may be a primary cell or a secondary cell
  • the second serving cell may be a primary cell or a secondary cell.
  • the TA group may include at least one serving cell. Information on the configuration of the TA group may be informed by the base station to the terminal.
  • the UE may implement an independent power amplifier for UL transmission in each TA group.
  • UL channels of different formats or a same format between a plurality of TA groups may transmit a UL channel, such as a PUCCH having a relatively high transmit power, in the same UL subframe.
  • the UE may transmit a PRACH in the first serving cell and simultaneously transmit PUCCH / PUSCH / SRS in the second serving cell.
  • the UE may transmit SRS in the first serving cell and simultaneously transmit PUCCH / PUSCH in the second serving cell.
  • PRACH can not be transmitted simultaneously with PUCCH / PUSCH / SRS in the same subframe.
  • the UE may transmit PUCCH / PUSCH / SRS in a serving cell belonging to another TA group in the same subframe as the PRACH. That is, even if UL channels cannot be simultaneously transmitted in the same TA group, it is proposed that simultaneous transmission is allowed in different TA groups.
  • the base station may inform the terminal whether the simultaneous transmission between a plurality of TA groups is allowed through the RRC message.
  • the PRACH (or random access preamble) may be transmitted in one cell in each TA group.
  • the first serving cell belongs to the first TA group, and the second serving cell belongs to the second TA group.
  • the second serving cell may transmit at least one of a UL channel, that is, PUSCH, PUCCH, and SRS. If the radio resources for transmitting the PRACH and the radio resources for transmitting the UL channel overlap, the total transmit power does not exceed the maximum transmission power set in the overlapped portion.
  • a PRACH is transmitted in a first serving cell and a PUCCH is transmitted in a second serving cell, it is assumed that one of OFDM symbols in which a PRACH is transmitted and one of OFDM symbols in which a PUCCH is transmitted are overlapped. If the total transmit power of PRACH and PUCCH in the overlapping OFDM symbol does not exceed the maximum transmit power, the PRACH and PUCCH are transmitted in the overlapped OFDM symbol.
  • Other cells in the TA group to which the first serving cell belongs may not transmit UL channels.
  • each TA group may transmit a PUCCH in one cell (or primary cell of a specific TA group) in each TA group.
  • Other cells of the TA group may not transmit PRACH / SRS / PUSCH, but cells belonging to another TA group may transmit RPRACH / SRS / PUSCH.
  • each TA group cannot simultaneously transmit SRS and / or PUSCH through the same OFDM symbol in different cells in each TA group.
  • Cells belonging to different TA groups may transmit SRS and / or PUSCH in the same OFDM symbol.
  • each TA group cannot simultaneously transmit PUCCHs from different cells in each TA group, but cells belonging to different TA groups can simultaneously transmit PUCCHs. In one subframe, each TA group cannot simultaneously transmit the same PUCCH format in different cells in each TA group, but cells belonging to different TA groups can simultaneously transmit the same PUCCH format. In one subframe, each TA group cannot simultaneously transmit different PUCCH formats in different cells in each TA group, but cells belonging to different TA groups can simultaneously transmit different PUCCH formats.
  • the base station may inform the user equipment through RRC signaling whether simultaneous transmission of a specific UL channel or UL physical channel format group between the TA groups described above is possible.
  • a UL channel (eg, PUCCH) carrying uplink control information (UCI) such as CSI and ACK / NACK for each TA group may be transmitted only in a cell belonging to the TA group.
  • UCI uplink control information
  • the first serving cell belongs to the first TA group, and the second serving cell belongs to the second TA group.
  • the radio resources used for transmission of the SRS in the first serving cell and the radio resources used for transmission of the UL channel (that is, at least one of PUSCH, PUCCH, and PRACH) of the second serving cell overlap in part or all. It is a problem.
  • the SRS may include periodic SRS and aperiodic SRS.
  • the last OFDM symbol of subframe n of the first serving cell is due to different TAs.
  • Some or all of the OFDM symbol and the first OFDM symbol of the subframe m + 1 may overlap.
  • the SRS transmission may be dropped. If at least some of the OFDM symbols used for transmission of the SRS and the OFDM symbols used for transmission of the UL channel overlap, the transmission of the SRS is abandoned.
  • the transmission of the SRS may be dropped when the overlapped portion exists and the total transmission power of the SRS and the UL channel exceeds a set maximum transmission power. If the total transmit power of the SRS and the UL channel does not exceed the set maximum transmit power, the SRS and the UL channel may be transmitted.
  • the transmission of the SRS is not dropped, but the total transmit power does not exceed the maximum transmit power.
  • the transmission power of the SRS can be reduced.
  • the aperiodic SRS dynamically scheduled by the base station may be important compared to other UL channels since the base station is for acquiring the UL channel state at a specific point in time. Thus, when aperiodic SRS is triggered, it may need to be handled differently than periodic SRS.
  • the overlapped portion may transmit aperiodic SRS and drop transmission of another UL channel in the overlapped portion.
  • the transmission of the UL channel may be abandoned.
  • the UL channel may include a PUCCH carrying CSI.
  • the aperiodic SRS may be transmitted and the transmit power of another UL channel in the overlapped portion may be lowered so as not to exceed the maximum transmit power.
  • the transmission power may be equally lowered over all OFDM symbols on which the UL channel is transmitted.
  • the UL channel may include a PUCCH carrying CSI.
  • the SRS may not overlap with the UL channel transmitted from another cell.
  • SRS may be transmitted.
  • the PUSCH is not transmitted in the last OFDM symbol. This is to reduce the complexity of the UL transmission of the terminal and to reduce the change in amplitude according to the UL transmission.
  • a PUSCH is transmitted over all OFDM symbols in a subframe in which SRS is not transmitted.
  • the PUSCH is transmitted over the OFDM symbols except for the last OFDM symbol.
  • 11 shows PUSCH and SRS transmission when a plurality of TA groups are configured.
  • the SRS may be abandoned.
  • the UE since the UE does not transmit the SRS in subframe n of the second serving cell, as shown in FIG. 11, the UE transmits the PUSCH over all OFDM symbols.
  • the base station may not accurately know the transmission timing between the first TA group to which the first serving cell belongs and the second TA group to which the second serving cell belongs. In addition, the base station does not know whether the total transmission power of the terminal exceeds the set maximum transmission power. Therefore, the base station cannot know exactly whether there is a duplicate part and whether the drop of the SRS transmission. Therefore, depending on whether the UE actually transmits the SRS or not, if the UE determines whether to transmit the PUSCH symbol in the corresponding OFDM symbol, a problem may occur in the base station receiving the PUSCH.
  • the same problem may occur if the total transmission power exceeds the maximum transmission power to give up SRS transmission.
  • a PUSCH is not transmitted in a corresponding SRS symbol regardless of whether the UE actually transmits the SRS.
  • the PUSCH may not be transmitted in a corresponding SRS symbol regardless of whether the UE transmits the SRS for all SRS subframes configured for SRS transmission for each cell or TA group.
  • the PUSCH may not be transmitted in the corresponding SRS symbol.
  • a UE configured with a first TA group and a second TA group transmits a PRACH to a first serving cell (eg, a secondary cell) belonging to the first TA group, and transmits a UL channel to a second serving cell belonging to the second TA group.
  • a first serving cell eg, a secondary cell
  • a UL channel e.g., a second serving cell belonging to the second TA group.
  • power allocation may be prioritized in order of PUCCH of the primary cell, PUSCH having UCI, PRACH of the secondary cell, and other channels. From the channel with the lower priority, the transmit power can be reduced or the abandoned transmission can be adjusted so that the total transmit power does not exceed the maximum transmit power.
  • high priority may be given to the UL channel transmitted through the TA group to which the primary cell belongs.
  • a first serving cell belonging to the first TA group is a secondary cell
  • a second serving cell to which the second serving cell belongs is a primary cell.
  • the transmission power of the UL channel transmitted in the first serving cell may be preferentially reduced or abandoned.
  • higher priority may be given to other UL channels than the PRACH transmitted in the secondary cell.
  • the transmission power of the PRACH may be first reduced or abandoned.
  • higher priority may be given to PRACH. This is because uplink synchronization of the TA group may be delayed if transmission of the PRACH fails. If the transmission interval of the UL channel and the transmission interval of the PRACH overlap, the transmission power can be reduced only in the overlapped portion.
  • PRACH may be given a lower priority.
  • PRACH short-PRACH
  • UpPTS UpPTS
  • the entire transmission interval of the PRACH may overlap with all or some of the transmission interval of the UL channel.
  • the total transmit power exceeds the maximum transmit power, it may be inefficient to abandon the transmission of the UL channel or to reduce the transmit power of the UL channel.
  • transmission may be abandoned or transmission power may be reduced only in a transmission period overlapping with the sPRACH.
  • the UL channel may be a PUCCH or a PUSCH with CSI.
  • the transmission of the sPRACH may be abandoned or the transmission power may be reduced.
  • the UL channel overlapping with the sPRACH may be a PUCCH with ACK / NACK.
  • FIG. 13 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
  • the base station 50 includes a processor 51, a memory 52, and an RF unit 53.
  • the memory 52 is connected to the processor 51 and stores various information for driving the processor 51.
  • the RF unit 53 is connected to the processor 51 and transmits and / or receives a radio signal.
  • the processor 51 implements the proposed functions, processes and / or methods. In the above embodiment, the serving cell and / or TA group may be controlled / managed by the base station, and the operation of one or more cells may be implemented by the processor 51.
  • the wireless device 60 includes a processor 61, a memory 62, and an RF unit 63.
  • the memory 62 is connected to the processor 61 and stores various information for driving the processor 61.
  • the RF unit 63 is connected to the processor 61 and transmits and / or receives a radio signal.
  • the processor 61 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the terminal may be implemented by the processor 61.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif sans fil pour effectuer une émission en liaison montante. Le dispositif sans fil émet un préambule d'accès aléatoire depuis une première cellule de desserte par l'intermédiaire d'une première ressource sans fil, et émet un canal de liaison montante depuis une deuxième cellule de desserte par l'intermédiaire d'une deuxième ressource sans fil. La première cellule de desserte appartient à un premier groupe d'avance temporelle (timing advance / TA), et la deuxième cellule de desserte appartient à un deuxième groupe de TA qui est différent du premier. La première ressource sans fil et la deuxième ressource sans fil se recouvrent en intégralité ou en partie.
PCT/KR2012/007887 2011-09-29 2012-09-28 Procédé et appareil d'émission en liaison montante WO2013048170A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US14/112,209 US8948119B2 (en) 2011-09-29 2012-09-28 Method and apparatus for transmitting uplink
US14/539,810 US9344242B2 (en) 2011-09-29 2014-11-12 Method and apparatus for transmitting uplink
US15/097,657 US9742539B2 (en) 2011-09-29 2016-04-13 Method and apparatus for transmitting uplink
US15/656,405 US9991999B2 (en) 2011-09-29 2017-07-21 Method and apparatus for transmitting uplink

Applications Claiming Priority (22)

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US201161541044P 2011-09-29 2011-09-29
US61/541,044 2011-09-29
US201161554493P 2011-11-01 2011-11-01
US61/554,493 2011-11-01
US201261591279P 2012-01-27 2012-01-27
US61/591,279 2012-01-27
US201261611590P 2012-03-16 2012-03-16
US61/611,590 2012-03-16
US201261613467P 2012-03-20 2012-03-20
US61/613,467 2012-03-20
US201261644439P 2012-05-09 2012-05-09
US61/644,439 2012-05-09
US201261645566P 2012-05-10 2012-05-10
US61/645,566 2012-05-10
US201261667935P 2012-07-03 2012-07-03
US61/667,935 2012-07-03
US201261678120P 2012-08-01 2012-08-01
US61/678,120 2012-08-01
US201261681636P 2012-08-10 2012-08-10
US61/681,636 2012-08-10
KR10-2012-0108364 2012-09-27
KR1020120108364A KR101306377B1 (ko) 2011-09-29 2012-09-27 상향링크 전송 방법 및 장치

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US14/112,209 A-371-Of-International US8948119B2 (en) 2011-09-29 2012-09-28 Method and apparatus for transmitting uplink
US14/539,810 Continuation US9344242B2 (en) 2011-09-29 2014-11-12 Method and apparatus for transmitting uplink

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