WO2014017792A1 - Dispositif et procédé pour effectuer une synchronisation de liaison montante dans un système multiporteuses - Google Patents

Dispositif et procédé pour effectuer une synchronisation de liaison montante dans un système multiporteuses Download PDF

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Publication number
WO2014017792A1
WO2014017792A1 PCT/KR2013/006539 KR2013006539W WO2014017792A1 WO 2014017792 A1 WO2014017792 A1 WO 2014017792A1 KR 2013006539 W KR2013006539 W KR 2013006539W WO 2014017792 A1 WO2014017792 A1 WO 2014017792A1
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Prior art keywords
terminal
uplink
time alignment
tag
base station
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PCT/KR2013/006539
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English (en)
Korean (ko)
Inventor
권기범
안재현
허강석
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주식회사 팬택
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Priority claimed from KR1020120086261A external-priority patent/KR20140015100A/ko
Application filed by 주식회사 팬택 filed Critical 주식회사 팬택
Publication of WO2014017792A1 publication Critical patent/WO2014017792A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks

Definitions

  • the present invention relates to an apparatus and method for performing uplink synchronization in wireless communication, and more particularly, to an apparatus and method for determining the validity of a time alignment value in a carrier aggregation system supporting multiple component carriers. It is about.
  • the random access procedure may be divided into a contention based random access procedure and a non-contention based random access procedure.
  • the biggest difference between the contention-based random access procedure and the non- contention-based random access procedure is whether a random access preamble is designated as dedicated to one UE.
  • contention refers to two or more terminals attempting a random access procedure using the same random access preamble through the same resource.
  • contention-based random access procedure there is a possibility of contention because the terminal uses a random access preamble selected by the UE.
  • FIG. 4 is a diagram briefly illustrating a concept of a multi-carrier system to which the present invention is applied.
  • FIG 5 shows an example of a cell deployment scenario to which the present invention is applied.
  • FIG. 8 is a view for explaining the condition of the loss of validity according to another embodiment of the present invention.
  • 9 is a view for explaining the condition of the loss of validity according to another embodiment of the present invention.
  • FIG. 13 illustrates a MAC control element for problem reporting according to an embodiment of the present invention.
  • FIG. 14 illustrates a MAC control element for problem reporting according to another example of the present invention.
  • FIG. 18 is a flowchart illustrating a method for providing validity of a time alignment value by a base station according to an embodiment of the present invention.
  • the wireless communication system 10 is widely deployed to provide various communication services such as voice and packet data.
  • the wireless communication system 10 includes at least one base station (BS) 11 and a repeater (not shown in the figure).
  • Each base station 11 provides a communication service for specific cells 15a, 15b, and 15c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • the signal quality is always deteriorated compared to the state transmitted by the first base station.
  • the same disadvantage occurs in the case of uplink.
  • signals transmitted from a plurality of terminals in a service area of an analog repeater are received by the analog repeater, and the analog repeater simply amplifies the plurality of signals and transmits the signals to the base station via wired / wireless.
  • the base station cannot distinguish each terminal from the analog signal. Accordingly, the base station cannot distinguish which of the signals received in the uplink is a signal received through an analog repeater and which signal is a signal directly received from the terminal.
  • the base station transmits all the processed digital signals as they are to the digital repeater by wire (usually optical cable).
  • Digital repeaters are also called Remote Radio Heads (RRHs) to distinguish them from analog repeaters. Since the base station transmits data from the digital state to the digital repeater, the base station can remove the effects of interference and noise generated from the analog base station, and the base station can distinguish the signal from the digital repeater and the signal received from the base station directly.
  • the analog repeater is referred to as a repeater or repeater.
  • the following methods are used to determine the location information of the terminal.
  • a method of estimating the position of a terminal in a two-dimensional plane using triangulation the terminal receives a georeferenced signal transmitted in cells existing at three or more physically separated points, and estimates the distance between the terminal and each cell using the signal strength of the received signals.
  • the terminal obtains a point where three concentric circles having the estimated distance as a radius meet based on triangulation, and measures the point as the position of the terminal.
  • This method has the advantage of identifying the exact one position of the x-y coordinate, but the additional reference signal for position estimation must be defined in the downlink.
  • the terminal since the terminal can determine the location information, the terminal should transmit the location information to the base station to obtain the location information in the network.
  • a method of estimating the position of the terminal using higher layer signaling The network collects information for estimating the location of the terminal using information for establishing a connection between the terminal and the network, information provided by the terminal, or strength of a reference signal transmitted by the terminal. And using this, the network estimates the location. This method can obtain the position of the terminal in real time in the network without additional reference signal for downlink position estimation.
  • a user equipment (UE) 12 may be fixed or mobile, and may have a mobile station (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 may be called in other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, an femto base station, a home nodeB, a relay, and the like. .
  • eNB evolved-NodeB
  • BTS base transceiver system
  • the cell should be interpreted in a comprehensive sense of a part of the area covered by the base station 11 and encompasses various coverage areas such as megacells, macrocells, microcells, picocells and femtocells.
  • downlink means communication from the base station 11 to the terminal 12, and 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.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-FDMA
  • OFDM-FDMA OFDM-FDMA
  • OFDM-TDMA OFDM-TDMA
  • various multiple access schemes such as OFDM-CDMA may be used.
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • the size (ie, bandwidth) of component carriers may be different from each other. For example, assuming that 5 component carriers are used for the configuration of the 70 MHz band, a 5 MHz component carrier (carrier # 0) + 20 MHz component carrier (carrier # 1) + 20 MHz component carrier (carrier # 2) + 20 MHz component carrier (carrier # 3) + 5MHz component carrier (carrier # 4) may be configured.
  • a multiple component carrier system refers to a system supporting carrier aggregation.
  • Adjacent carrier aggregation and / or non-adjacent carrier aggregation may be used in a multi-component carrier system, and either symmetric aggregation or asymmetric aggregation may be used.
  • FIG. 2 shows an example of a protocol structure for supporting multiple carriers to which the present invention is applied.
  • a medium access control (MAC) entity 210 manages a physical layer 220 using a plurality of carriers.
  • the MAC management message transmitted on a specific carrier may be applied to other carriers. That is, the MAC management message is a message capable of controlling other carriers including the specific carrier.
  • the physical layer 220 may operate in a time division duplex (TDD) and / or a frequency division duplex (FDD).
  • TDD time division duplex
  • FDD frequency division duplex
  • the physical downlink control channel informs the UE of resource allocation of a paging channel (PCH) and downlink shared channel (DL-SCH) and hybrid automatic repeat request (HARQ) information related to the DL-SCH.
  • the PDCCH may carry an uplink grant informing the UE of resource allocation of uplink transmission.
  • the physical control format indicator channel informs the UE of the number of OFDM symbols used for PDCCHs and is transmitted every subframe.
  • PHICH physical Hybrid ARQ Indicator Channel
  • PHICH physical Hybrid ARQ Indicator Channel
  • Physical uplink control channel (PUCCH) carries uplink control information such as HARQ ACK / NAK, scheduling request, and CQI for downlink transmission.
  • the physical uplink shared channel (PUSCH) carries an uplink shared channel (UL-SCH).
  • a physical random access channel (PRACH) carries a random access preamble.
  • FIG 3 shows an example of a frame structure for multi-carrier operation to which the present invention is applied.
  • a radio frame consists of 10 subframes.
  • the subframe includes a plurality of OFDM symbols.
  • Each carrier may have its own control channel (eg, PDCCH).
  • the multicarriers may or may not be adjacent to each other.
  • the terminal may support one or more carriers according to its capability.
  • the component carrier may be divided into a primary component carrier (PCC) and a secondary component carrier (SCC) according to activation.
  • the major carriers are always active carriers, and the subcarrier carriers are carriers that are activated / deactivated according to specific conditions. Activation refers to the transmission or reception of traffic data being made or in a ready state. Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible.
  • the terminal may use only one major carrier, or may use one or more subcomponent carriers together with the major carrier.
  • the terminal may be assigned a major carrier and / or sub-carrier carrier from the base station.
  • downlink component carriers D1, D2, and D3 are aggregated as an example, and uplink component carriers U1, U2, and U3 are aggregated.
  • Di is an index of a downlink component carrier
  • connection configuration 1: n or n: 1.
  • the downlink component carrier corresponding to the primary serving cell is referred to as DL PCC, and the uplink component carrier corresponding to the primary serving cell is called UL PCC.
  • DL SCC downlink sub-component carrier
  • UL SCC uplink sub-component carrier
  • the primary serving cell refers to one serving cell that provides security input and NAS mobility information in an RRC connection or re-establishment state.
  • at least one cell may be configured to form a set of serving cells together with the main serving cell, wherein the at least one cell is called a secondary serving cell.
  • the set of serving cells configured for one terminal may consist of only one main serving cell or one main serving cell and at least one secondary serving cell.
  • communication between the terminal and the base station is performed through the DL CC or the UL CC, which is equivalent to the communication between the terminal and the base station through the serving cell.
  • transmitting a preamble by using a UL CC may be regarded as a concept equivalent to transmitting a preamble using a main serving cell or a secondary serving cell.
  • the UE receiving the downlink information by using the DL CC can be seen as a concept equivalent to receiving the downlink information by using the primary serving cell or secondary serving cell.
  • the main serving cell and the secondary serving cell have the following characteristics.
  • the main serving cell is always activated, while the secondary serving cell is a carrier that is activated / deactivated according to a specific condition.
  • the specific condition may be a case where the activation / deactivation MAC control element message of the base station is received or the deactivation timer in the terminal expires.
  • Radio link failure occurs when downlink performance is maintained below a threshold for more than a predetermined time, or when the RACH has failed a number of times above the threshold.
  • the main serving cell may be changed by a security key change or a handover procedure accompanying the RACH procedure.
  • the PDCCH indicating the CR should be transmitted through the main serving cell, and the CR information may be transmitted through the main serving cell or the secondary serving cell.
  • NAS non-access stratum
  • the main serving cell always consists of a pair of DL PCC and UL PCC.
  • a different CC may be set as a primary serving cell for each terminal.
  • RRC radio resource control
  • RRC signaling may be used to transmit system information of a dedicated secondary serving cell.
  • the main serving cell is a PDCCH (for example, downlink allocation information allocated to a UE-specific search space) configured to transmit control information only to a specific terminal in an area for transmitting control information. Or uplink grant information) and a PDCCH (for example, system information (for example, system information) allocated to a common search space configured for transmitting control information to all terminals in a cell or a plurality of terminals meeting specific conditions). SI), random access response (RAR), and transmit power control (TPC).
  • the secondary serving cell may be set only a terminal-specific search space. That is, since the terminal cannot identify the common search space through the secondary serving cell, the terminal cannot receive control information transmitted only through the common search space and data information indicated by the control information.
  • a secondary serving cell in which a common search space (CSS) can be defined may be defined.
  • Such a secondary serving cell is referred to as a special secondary serving cell (special SCell).
  • the special secondary serving cell is always configured as a scheduling cell during cross carrier scheduling.
  • the PUCCH configured in the main serving cell may be defined for the special secondary serving cell.
  • the PUCCH for the special secondary serving cell may be fixedly configured when the special secondary serving cell is configured, or the base station may be allocated (configured) or released by RRC signaling (RRC reconfiguration message) when the base station is reconfigured for the secondary secondary cell. have.
  • the base station may configure one special secondary serving cell of the plurality of secondary serving cells, or may not configure a special secondary serving cell.
  • the reason for not configuring the special secondary serving cell is because it is determined that CSS and PUCCH need not be set. For example, if it is determined that the contention-based random access procedure does not need to be performed in any secondary serving cell, or it is determined that the current capacity of the PUCCH of the primary serving cell is sufficient, it is not necessary to set the PUCCH for the additional secondary serving cell. Corresponding.
  • a propagation delay occurs while a radio wave propagates at a transmitter and is transmitted from a receiver. Therefore, even if both transmitters and receivers know exactly the time when radio waves propagate in the transmitter, the time that a signal arrives at the receiver is affected by the transmission / reception period distance, the surrounding radio wave environment, and changes with time when the receiver moves. If the receiver does not know exactly when the signal transmitted by the transmitter is received, even if the signal reception fails or is received, the receiver receives the distorted signal and communication is impossible.
  • synchronization between a base station and a terminal must be made in advance in order to receive an information signal regardless of downlink and uplink.
  • synchronization there are various types of synchronization, such as frame synchronization, information symbol synchronization, and sampling period synchronization.
  • Sampling period synchronization is the most basic synchronization to be obtained in order to distinguish physical signals.
  • Downlink synchronization acquisition is performed in the terminal based on the signal of the base station.
  • the base station transmits a specific signal mutually promised to facilitate downlink synchronization acquisition in the terminal.
  • the terminal should be able to accurately discern the time when the specific signal transmitted from the base station is transmitted.
  • the terminals can independently acquire synchronization.
  • the base station receives signals from a plurality of terminals.
  • the signals received by the base station have a different transmission delay time.
  • the base station receives information of each terminal at different times. In this case, the base station cannot obtain synchronization based on any one terminal. Therefore, uplink sync acquisition requires a different procedure from downlink.
  • time alignment timer If the time alignment timer expires or does not operate, the UE and the base station report that they are not synchronized with each other, and the UE does not perform uplink transmission other than the transmission of the random access preamble.
  • the time alignment timer specifically operates as follows.
  • the terminal When the terminal receives a timing advance command (TAC) from the base station through the MAC control element, the terminal applies a time alignment value indicated by the received time advance command to uplink synchronization. The terminal then starts or restarts the time alignment timer.
  • TAC timing advance command
  • the terminal receives the time alignment value indicated by the time advance command. Applies to uplink synchronization and starts or restarts the time alignment timer. Or, if the terminal receives the time advance command through the random access response message from the base station, if the random access response message is selected in the MAC layer of the terminal and the time alignment timer is not running (b), the terminal is time advance The time alignment value indicated by the command is applied to the uplink synchronization, the time alignment timer is started, and the time alignment timer is stopped if it fails later in the contention resolution, which is a random access step. Or, in cases other than (a) and (b), the terminal ignores the time advance command.
  • the terminal flushes data stored in all HARQ buffers.
  • the terminal informs release of PUCCH / SRS to the RRC layer.
  • the type 0 SRS (periodic SRS) is released and the type 1 SRS (aperiodic SRS) is not released.
  • the terminal clears all configured downlink and uplink resource allocation.
  • FIG 5 shows an example of a cell deployment scenario to which the present invention is applied.
  • the terminal 500 includes a main serving cell 510 having a frequency of F2 and a secondary serving cell 520 having a frequency of F1, and the terminal 500 passes from position a to position b through position b. Is moving to.
  • the vicinity of the location c is an area serviced by the repeater 530, and the terminal 500 performs communication through the repeater 530 at the location c.
  • both the main serving cell 510 and the secondary serving cell 520 configured in the terminal 500 are in an activated state.
  • the primary serving cell 510 and the secondary serving cell 520 may be provided by the same base station or may be provided by different base stations.
  • the primary serving cell 510 belongs to a first timing alignment group (TAG) having a time alignment value TA1 or TA3, and the secondary serving cell 520 is assigned to a second time alignment group having a time alignment value TA1. Belongs.
  • TAG timing alignment group
  • a time alignment group is a set of serving cells using the same timing reference and the same time alignment value (that is, the same amount of uplink time adjustment is required).
  • a time alignment group including the primary serving cell is called a pTAG (primary TAG), and a time alignment group not including the primary serving cell is called a sTAG (secondary TAG).
  • the time alignment group is a parameter that is UE-specifically formed by the RRC. That is, even the same serving cell may belong to the time alignment group 1 (TAG1) for the terminal 1 and to the time alignment group 2 (TAG2) for the terminal 2.
  • TAG1 time alignment group 1
  • TAG2 time alignment group 2
  • the time alignment group may change dynamically.
  • the time alignment group may be called a timing advance group.
  • the terminal 500 may periodically transmit a sounding reference signal (SRS) for the F1 frequency band.
  • SRS sounding reference signal
  • the base station may continuously monitor the change in the time alignment value TA1 by receiving the SRS.
  • the base station may change the time alignment value to be used by the terminal 500 in the F1 band by using an update procedure if necessary by checking the validity of the time alignment value.
  • the update procedure includes a random access procedure or a procedure of transmitting a MAC control element (CE) message.
  • CE MAC control element
  • the terminal 500 deactivates the secondary serving cell 520 at the position b. If all secondary serving cells of TAG2 are deactivated, the terminal 500 cannot perform sounding reference signals and other uplink transmissions through any serving cell in TAG2. Therefore, the base station cannot confirm the validity of TA1 with respect to TAG2. At this time, the time alignment timer for TAG2 continues.
  • the time alignment timer is introduced to determine the validity of the time alignment value, and the terminal 500 receives the expiration time of the time alignment timer from the base station.
  • the expiration time of the time alignment timer is determined by the base station based on the movement speed of the terminal 500 estimated by the base station.
  • the terminal 500 activates the secondary serving cell 520 at the location c. At this time, the secondary serving cell 520 communicates with the terminal 500 through the repeater 530.
  • the uplink synchronization for the repeater 530 is time alignment value TA2 is applied. However, since the time alignment timer for TAG2 is still in progress, uplink synchronization with respect to the terminal 500 is still in a TA1 state. Therefore, a sudden change in the time alignment value, such as a change in the installation environment of the repeater 530, can not be guaranteed validity by the time alignment timer.
  • the terminal 500 when the terminal 500 verifies the validity of the time alignment value using only the time alignment timer, the terminal 500 performs uplink transmission according to uplink synchronization according to the invalid TA1, thereby repeating the relay 530. ) Can interfere with the uplink signals of all terminals communicating directly with the base station using the F1 frequency band, as well as other terminals communicating with each other.
  • the terminal 500 should first check whether the previously set time alignment value is valid in consideration of the time alignment value due to the influence of the surrounding repeaters. When the validity of the time alignment value is verified, the terminal 500 may maintain uplink synchronization according to the existing time alignment value and transmit an uplink control signal or a data signal.
  • an embodiment discloses a method for the terminal to determine the validity of the time alignment value.
  • another embodiment discloses a procedure for acquiring a valid time alignment value when the existing time alignment value is found to be invalid.
  • Another embodiment discloses the structure and content of a message used in a procedure for obtaining a valid time alignment value.
  • the terminal determines the validity of the time alignment value based on a validity loss condition. If the loss of validity condition is satisfied, the previous time alignment value is no longer valid. That is, the terminal checks whether the validity loss condition is satisfied, and if the validity loss condition is satisfied, the terminal cannot transmit an uplink signal using a previous time alignment value. This is described with the main view that the time alignment value is invalid. On the contrary, even in the same phenomenon, a validity hold condition defined in view of whether the validity of the time alignment value is maintained may be used. If the validity condition is met, the previous time alignment is valid. That is, the terminal may check whether the validity maintaining condition is satisfied, and if the validity maintaining condition is satisfied, the terminal may proceed to transmit an uplink signal using a previous time alignment value.
  • the satisfaction and dissatisfaction of the validity loss condition may be reinterpreted as the dissatisfaction and satisfaction of the validity retention condition, and the present invention includes the scope of the right when all embodiments of the present specification are reinterpreted in terms of the validity retention condition. do.
  • the UE determines whether each of the validity loss conditions is satisfied for each TAG.
  • the terminal monitors whether the time alignment timer of each TAG expires. When the first time alignment timer expires, the terminal may determine that the time alignment value of the TAG according to the first time alignment timer is invalid. In contrast, if the second time alignment timer has not expired, the terminal may determine that the time alignment value of the TAG according to the second time alignment timer is still valid.
  • the UE proceeds when the time alignment timer expires.
  • the TAG related configuration information may be serving cell information and time alignment timer value included in the corresponding TAG, and may additionally include a currently valid TA value.
  • the terminal must update the released TAG related configuration information and the time alignment value for the corresponding TAG. In this case, the base station can also recognize the expiration of the time alignment timer.
  • the terminal may perform a random access procedure. If the main serving cell is included in the corresponding TAG, the UE may initiate a random access procedure by itself. The terminal may receive an updated time alignment value from the base station by the random access procedure.
  • the UE may initiate a random access procedure according to an indication of the base station (ex, PDCCH order), the time alignment value updated from the base station by the random access procedure Can be received.
  • the terminal may set a TA value, which is valid among the TAG-related configuration information when the time alignment timer expires, to an initial value set when the first TAG is generated.
  • the initial value of the TA value may be zero.
  • some of the HARQ buffer and SRS operation related parameters for uplink data transmission may be released without releasing TAG related configuration information, and uplink transmission may be stopped only in the TAG.
  • the terminal adjusts the uplink time based on the updated time alignment value and resumes uplink transmission based on the adjusted uplink time.
  • T1 is a downlink timing value measured within a period in which all of the serving cells in the TAG are determined to be deactivated or changed from the time when the deactivation indicator is received from the base station to the deactivated state.
  • T2 may be a downlink timing value measured at the earliest time since at least one serving cell of the TAG is activated.
  • the timing at which downlink timing can be measured is activated, and is an active time by DRX (Discontinous Reception) operation, or a timing of transmitting PUCCH / PUSCH / SRS through uplink ( Subframe) or a time point (subframe) for transmitting the PRACH.
  • DRX Discontinous Reception
  • the difference between T1 and T2 includes the absolute value
  • the downlink timing value measured when the UE receives a time advance command (TAC) indicating a time alignment value for the TAG from the base station with reference to FIG. 8 may be T1.
  • T2 may be a downlink timing value measured at the earliest time since at least one serving cell of the TAG is activated.
  • the difference between T1 and T2 includes the absolute value
  • the TAC is transmitted from a base station in a random access response (RAR) message or a TAC MAC control element (CE).
  • RAR random access response
  • CE TAC MAC control element
  • the terminal receives a time advance command (TAC) indicating a time alignment value for the TAG from the base station, and finally updates the time alignment value based on the time advance command.
  • TAC time advance command
  • the downlink timing value measured at one time point may be T1.
  • T2 may be a downlink timing value measured at the earliest time since at least one serving cell of the TAG is activated.
  • the difference between T1 and T2 includes the absolute value
  • the TAC is transmitted from a base station in a random access response (RAR) message or a TAC MAC control element (CE).
  • RAR random access response
  • CE TAC MAC control element
  • FIG. 9 illustrates determining that a time alignment value for a previously received TAG is not valid when deactivation of a TAG secondary serving cell continues. More specifically, when the time alignment timer for the TAG expires while the deactivation of the secondary serving cell of the TAG is maintained, a loss of validity condition is satisfied.
  • the terminal drives a time alignment timer for the TAG immediately after the TAG secondary serving cell is deactivated, and monitors whether the time alignment timer expires. When the time alignment timer expires, the terminal may determine that the time alignment value of the TAG according to the time alignment timer is invalid.
  • the UE proceeds when the time alignment timer expires. For example, the terminal releases TAG related configuration information. The terminal must update the released TAG related configuration information and the time alignment value for the corresponding TAG. In this case, the base station can also recognize the expiration of the time alignment timer. In order to update the TAG related configuration information and the time alignment value for the corresponding TAG, the terminal may perform a random access procedure. If the main serving cell is included in the corresponding TAG, the UE may initiate a random access procedure by itself. The terminal may receive an updated time alignment value from the base station by the random access procedure.
  • the UE may initiate a random access procedure according to an indication of the base station (ex, PDCCH order), the time alignment value updated from the base station by the random access procedure Can be received.
  • the UE may set the TA value among the TAG related parameters when the time alignment timer expires to an initial value set when the first TAG is generated. At this time, the initial value of the TA value may be zero.
  • some of the parameters related to the HARQ operation and the SRS operation may be released without releasing TAG-related configuration information, and uplink transmission may be stopped only in the TAG.
  • the terminal adjusts the uplink time based on the updated time alignment value and resumes uplink transmission based on the adjusted uplink time.
  • the UE measures the downlink timing value T1 for the activated secondary serving cell, continuously monitors the downlink timing value, and confirms that the downlink timing value is jumped to T2 for a predetermined time or more.
  • the T2 value is continuously confirmed, that is, when the period of time maintained after the rapid change from T1 to T2 lasts for a specific time or more, the condition for loss of effectiveness is considered to be satisfied.
  • the specific time may be a parameter determined by the terminal without an indication of the base station or may be set to a parameter indicated by the base station.
  • the timing reference cell caused the difference in the downlink timing value is included in a specific TAG, the terminal determines that the time alignment value for the TAG is not valid.
  • the TAG is a pTAG including the main serving cell
  • the UE may initiate a random access procedure by itself.
  • the terminal may receive an updated time alignment value from the base station by the random access procedure.
  • the TAG is an sTAG including only secondary serving cells
  • the terminal cannot initiate a random access procedure by itself. In this case, in order to acquire the uplink synchronization of the secondary serving cell, the UE must voluntarily initiate a random access procedure by using the primary serving cell, and a clear procedure for this should be defined.
  • the effective threshold value may be linked to the error correction range of the time alignment value.
  • the effective threshold value should be defined within a range in which the time alignment value can be effectively modified.
  • Tq is an automatic error correction range in terms of a time alignment value
  • the automatic error correction range is converted to a dimension of a downlink timing value so that an effective threshold value corresponds to the Tq.
  • a functional relationship such as the following equation, may be established between the effective threshold and the time alignment value.
  • FIG. 13 illustrates a MAC control element for problem reporting according to an embodiment of the present invention.
  • the step of confirming whether the triggering condition of the random access procedure is satisfied includes the step of the terminal confirming whether an uplink grant is indicated in the current TTI. That is, the terminal monitors reception of an uplink grant during the current TTI.
  • the terminal checks whether the time alignment timer (TAT) expires (S1720).
  • the base station checks the position of the repeater (S1800).
  • UEAssistInformationRequest-IEs SEQUENCE ⁇ OtherAssistInfoReq ENUMERATED true OPTIONAL,-Need ON nonCriticalExtension SEQUENCE OPTIONAL-Need OP ⁇
  • the terminal may store at least one information on the time, location, and cause of the problem (inconsistency of uplink time synchronization due to a change in downlink timing).
  • the base station may receive other assistance information composed of a syntax as shown in the following table from the terminal (S1810).
  • the base station receives an uplink signal, such as SRS or CSI report, from the terminal based on the uplink time synchronization adjusted based on the valid time alignment value (S1830).
  • an uplink signal such as SRS or CSI report
  • the UE When the triggering condition of the random access procedure is satisfied (that is, when the uplink grant is not indicated to the current TTI), the UE starts the random access procedure in the main serving cell.
  • the terminal transmits a random access preamble to the base station (S1910), and the base station transmits a random access response message including an uplink grant to the terminal (S1915).
  • the terminal transmits a problem report to the base station using the resource indicated by the uplink grant (S1920).
  • 20 is a block diagram illustrating a terminal and a base station according to an embodiment of the present invention.
  • the terminal receiver 2005 receives a random access response message (RAR for UL grant) for the uplink grant, a MAC CE for TAC (MAC CE) for a time forward command, a terminal assistance information request message, and the like from the base station 2050. .
  • RAR random access response message
  • MAC CE for TAC
  • terminal assistance information request message and the like from the base station 2050.
  • the invalidity condition is that the time alignment timer for the TAG configured immediately after the secondary serving cell of the TAG is expired. Therefore, the validity confirming unit 2011 drives the time alignment timer for the TAG immediately after the TAG secondary serving cell is deactivated as shown in FIG. 9, and monitors whether the time alignment timer expires. When the time alignment timer expires, the validity confirming unit 2011 may determine that the time alignment value of the TAG according to the time alignment timer is not valid.
  • the validity confirming unit 2011 performs the uplink transmission based on the uplink time according to the previous time alignment value. Control 2020.
  • the uplink transmission includes periodic SRS (type-0 SRS) transmission, aperiodic SRS, random access preamble, periodic CQI transmission (periodic CSI reporting), and the like.
  • the validity confirming unit 2011 transmits it to the random access processing unit 2012.
  • the random access processor 2012 checks whether the triggering condition of the random access procedure RA is satisfied.
  • the triggering condition of the random access procedure may be defined as one of (1) and (2) of (Part 2).
  • the triggering condition of the random access procedure is i) the loss of validity condition will be satisfied. That is, when it is confirmed that the condition for losing validity is satisfied, the random access processing unit 2012 may determine that the triggering condition of the random access procedure is satisfied.
  • the random access processing unit 2012 determines whether the uplink grant is indicated to the current TTI, whether the primary serving cell or the uplink synchronization is secured, the random access processing unit 2012 is allocated by the uplink grant.
  • the problem report is transmitted on the corresponding serving cell by using the uplink resource.
  • the random access processing unit 2012 initiates a random access procedure by itself.
  • the terminal transmitter 2020 may transmit the random access preamble on another secondary serving cell having uplink time synchronization.
  • the random access processing unit 2012 initiates a random access procedure by a PDCCH order by the base station 2050.
  • the terminal receiver 2005 When the terminal receiver 2005 receives the random access response message for the uplink grant, the terminal receiver 2005 sends the random access response message to the validity confirming unit 2011.
  • the validity confirming unit 2011 generates a problem report and sends the problem report to the terminal transmitting unit 2020.
  • the terminal transmitter 2020 transmits a problem report to the base station 2050.
  • the content and structure of the problem report is as described in (Part 3).
  • the base station 2050 includes a base station transmitter 2055, a base station receiver 2060, and a base station processor 2070.
  • the base station processor 2070 further includes an update determining unit 2071 and a random access processing unit 2082.
  • the base station transmitter 2055 transmits a random access response message (RAR for UL grant) for the uplink grant, a MAC CE for TAC (MAC CE) for a time forward command, a terminal assistance information request message, and the like to the terminal 2000. do.
  • RAR random access response message
  • MAC CE for TAC
  • terminal assistance information request message and the like to the terminal 2000. do.
  • the base station receiver 2060 receives a problem report, a random access preamble, and other auxiliary information from the terminal 2000 as well as an uplink signal such as an SRS and a CSI report.
  • the random access processing unit 2082 performs a random access procedure for transmitting a random access response message for the uplink grant to the terminal. More specifically, when the base station receiving unit 2060 receives a random access preamble from the terminal 2000 on the main serving cell, the random access processing unit 2082 generates a random access response message for the uplink grant to transmit the base station 2055. The base station transmitter 2055 transmits a random access response message for the uplink grant to the terminal 2000. On the other hand, when the base station receiver 2060 receives a problem report from the terminal 2000 through the resource indicated by the uplink grant, the update determination unit 2071 checks the TAG ID having a problem based on the problem report. After that, the time alignment value for the corresponding TAG is calculated.
  • the random access processing unit 2082 performs a random access procedure for transmitting a time advance command indicating the time alignment value to the terminal. More specifically, the random access processor 2072 controls the base station transmitter 2055 to transmit a PDCCH command for the secondary serving cell of the sTAG to the terminal 2000. When the base station receiving unit 2060 receives the random access preamble from the terminal 2000, the random access processing unit 2082 generates a random access response message (RAR including TAC) or a MAC CE for the TAC including a time advance command. Send to the base station transmitter 2055.
  • RAR random access response message
  • MAC CE MAC CE

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

Abstract

La présente invention concerne un dispositif et un procédé destinés à effectuer une synchronisation de liaison montante dans un système multiporteuses. La présente invention décrit un procédé comportant les étapes consistant à : vérifier si une condition de perte de validité d'une valeur d'alignement temporel utilisée pour le réglage d'un temps de liaison montante d'une cellule secondaire en service est satisfaite ; vérifier si une attribution de liaison montante à un terminal n'indique pas le TTI actuel ; envoyer un préambule d'accès aléatoire d'une cellule principale en service configurée dans le terminal à une station de base ; recevoir un message de réponse d'accès aléatoire comprenant l'attribution de liaison montante au terminal en provenance de la station de base ; et, en utilisant une ressource de liaison montante indiquée par l'attribution de liaison montante, envoyer à la station de base, un avis de dérangement qui indique un indice d'un groupe d'alignement temporel auquel appartient la cellule secondaire en service.
PCT/KR2013/006539 2012-07-26 2013-07-22 Dispositif et procédé pour effectuer une synchronisation de liaison montante dans un système multiporteuses WO2014017792A1 (fr)

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KR20120082001 2012-07-26
KR10-2012-0082001 2012-07-26
KR10-2012-0086261 2012-08-07
KR1020120086261A KR20140015100A (ko) 2012-07-26 2012-08-07 다중 요소 반송파 시스템에서 상향링크 동기의 수행장치 및 방법

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WO2018199691A1 (fr) * 2017-04-28 2018-11-01 엘지전자 주식회사 Procédé et appareil de partage de puissance dans un système de communication sans fil
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