WO2022078920A1 - Procédés et systèmes de compensation de retard de propagation - Google Patents

Procédés et systèmes de compensation de retard de propagation Download PDF

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Publication number
WO2022078920A1
WO2022078920A1 PCT/EP2021/077966 EP2021077966W WO2022078920A1 WO 2022078920 A1 WO2022078920 A1 WO 2022078920A1 EP 2021077966 W EP2021077966 W EP 2021077966W WO 2022078920 A1 WO2022078920 A1 WO 2022078920A1
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WIPO (PCT)
Prior art keywords
command
signal transmission
transmission timing
uplink signal
timing
Prior art date
Application number
PCT/EP2021/077966
Other languages
English (en)
Inventor
Zhenhua Zou
Yufei Blankenship
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2022078920A1 publication Critical patent/WO2022078920A1/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others

Definitions

  • the legacy multi-RTT positioning method makes use of the UE Rx-Tx time difference measurements and Downlink (DL) Positioning Reference Signal (PRS) Reference Signal Received Power (RSRP) of downlink signals received from multiple TRPs measured by the UE, and the measured gNB Rx-Tx time difference measurements and UL-SRS-RSRP at multiple TRPs of uplink signals transmitted from UE.
  • the measurements are used to determine the RTT at the positioning server which are used to estimate the location of the UE.
  • the RTT based delay compensation is leveraged on the legacy multi-RTT positioning method illustrated in FIG. 1. As shown in FIG.
  • the user equipment (UE) 102 (which can be any device capable of wirelessly communicating with a base station) transmits an uplink frame i and records the transmission time as ti.
  • the base station (gNB) 104 receives uplink frame i and records the time of arrival of the first detected path as t3.
  • the gNB transmits a downlink frame j to the UE, and records transmission time as t2.
  • the UE receives downlink frame j and records the time of arrival of the first detected path as U.
  • the reference cell for reference time delivery is the Primary Cell (PCell).
  • the reference time information sent on Radio Resource Control (RRC) contains a field that indicates the reference System Frame Number (SFN) corresponding to the reference time information. It is possible to have unaligned SFN across carriers in a cell group, and thus a reference cell is needed and defined in RRC that “If referenceTimelnfo field is received in DLInformationTransfer message, this field indicates the SFN of PCell.”
  • PSCell is not included as DLInformationTransfer is sent on SRB1/2 on MCG not on SCG Additionally, SIB9 is only broadcasted on PCell and this restriction aligns the RRC-dedicated and broadcast message for reference time delivery.
  • a method performed by a network node comprises transmitting toward a user equipment (UE) an order.
  • the method further comprises after transmitting the order, obtaining (s404) timing information indicating the UE’s uplink signal transmission timing.
  • the method further comprises after obtaining the timing information, transmitting toward the UE a message containing a timing advance (TA) command.
  • the TA command is configured to trigger the UE to adjust the UE’s uplink signal transmission timing.
  • a method performed by a user equipment comprises receiving from a network node an order and after receiving the order, transmitting toward the network node timing information indicating UE’s uplink signal transmission timing.
  • the method further comprises after transmitting the timing information, receiving from the network node a message containing a timing advance (TA) command, and adjusting the UE’s uplink signal transmission timing based on the TA command.
  • TA timing advance
  • an apparatus configured to transmit toward a user equipment (UE) an order, and after transmitting the order, obtain timing information indicating the UE’s uplink signal transmission timing.
  • the apparatus is further configured to after obtaining the timing information, transmit toward the UE a message containing a timing advance (TA) command.
  • the TA command is configured to trigger the UE to adjust the UE’s uplink signal transmission timing.
  • an apparatus configured to receive from a network node an order, and after receiving the order, transmit toward the network node timing information indicating UE’s uplink signal transmission timing.
  • the apparatus is further configured to after transmitting the timing information, receive from the network node a message containing a timing advance (TA) command, and adjust the UE’s uplink signal transmission timing based on the TA command.
  • TA timing advance
  • an apparatus comprising a memory and processing circuitry coupled to the memory.
  • the apparatus is configured to perform the methods described above.
  • FIG. 1 is a message flow diagram illustrating a process for determining RTT.
  • FIG. 2 is an example of a simplified message flow diagram according to some embodiments.
  • FIGS. 3 A-3D show examples of MAC CE.
  • FIG. 4 is a flowchart illustrating a process according to some embodiments.
  • FIG. 5 is a flowchart illustrating a process according to some embodiments.
  • FIG. 6 illustrates a gNB according to some embodiments.
  • FIG. 7 illustrates a UE according to some embodiments.
  • TA is used in the embodiments of this disclosure.
  • TA enables a user equipment (UE) to adjust its uplink (UL) signal transmission timing to better align the timing of receiving data from the UE at a base station (BS) with the timing of sending data from the BS to the UE.
  • data e.g., Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), etc.
  • the BS may send to the UE a TA command asking the UE to transmit data a little bit late.
  • the BS may send to the UE a TA command asking the UE to transmit data a little bit early.
  • a TA command may be categorized as a finer granularity TA command and a legacy TA command.
  • the finer granularity TA command and/or the legacy TA command may be used for TA.
  • TA command may be sent either as an incremental TA command or as an absolute TA command.
  • TA command may be sent using the following two signaling approaches: (1) Using the Random Access Response (e.g., Medium Access Control (MAC) Random Access Response (RAR) or fallbtack RAR)) for the transmission of an absolute TA command and (2) Using a separate MAC Control Element (CE) for either an incremental TA command or an absolute TA command.
  • Random Access Response e.g., Medium Access Control (MAC) Random Access Response (RAR) or fallbtack RAR
  • CE MAC Control Element
  • Absolute TA command (the TA command that does not depend on any previously used/ stored time adjustment) may only be transmitted during random access procedure.
  • FIG. 2 shows an example of a simplified message flow diagram 200 according to some embodiments.
  • the diagram 200 shows messages exchanged between UE 102 and BS 104.
  • BS 104 may transmit to UE 102 a Physical Downlink Control Channel (PDCCH) order 202.
  • PDCCH order 202 is a mechanism by which BS 104 forces UE 102 to initiate Physical Random Access Channel (PRACH).
  • PRACH Physical Random Access Channel
  • BS 104 may obtain an up-to-date UL timing information 204 from UE 102.
  • the Absolute Timing Advance Command MAC CE 206 (e.g., as defined in 6.1.3.4a of TS 38.321) may be used as a response to indicate the absolute TA command.
  • MAC CE applies for Primary Timing Advance Group (PT AG) but it may only be sent by BS 104 in response to a MsgA transmission from UE 102 including a Cell Radio Network Temporary Identifier (C-RNTI) MAC CE. Also, in Rel-16 UE expects and applies the absolute TA command MAC CE if the timeAlignmentTimer associated with the PT AG is not running.
  • timeAlignmentTimer is a configurable timer provided by BS 104 to UE 102. timeAlignmentTimer may be used to control how long UE 102 may consider or assume that UL timing is aligned.
  • BS 104 may send a PDCCH order 202 even if UE 102 and BS 104 are not out of sync (i.e., the associated timeAlignmentTimer is still running). In such case, UE 102 may apply the absolute TA command MAC CE regardless of the status of the associated timeAlignmentTimer for the PTAG.
  • the Rel-16 absolute TA command MAC CE may have the form shown in FIG. 3A (e.g., as shown in subclause 6.1.3.4a of TS 38.321 vl6.2.1).
  • the TA command field may indicate the index value TA that is used to control the amount of timing adjustment that the MAC entity has to apply.
  • the size of the TA command field is 12 bits.
  • the legacy TA command for a Timing Advance Group may indicate the amount of change of the UL timing relative to the current UL timing for the TAG in multiples of 16 ⁇ 64 ⁇
  • T A Time Advance Group
  • CE Medium Access Control
  • m extra bits may be used to signal a TA command with finer granularity
  • the granularity may be that of the existing
  • TA command (regardless of whether the TA command is absolute or incremental). Therefore, if the value of the finer granularity TA command in the message from the gNB is (TA)’, then the acutal TA for the UE is (TA)’.
  • the first four or part of these four reserved bits in the Rel-16 absolute TA command MAC CE may be used to indicate a finer granularity beyond the smallest granularity that may be expressed by the index value.
  • the finer TA command may indicate a granularity of one eighth of the TA granularity in Rel-15 and Rel-16, i.e.,
  • the legacy MAC CE is not reused by repurposing the “reserved bits” but a new MAC CE with a new (e)LCID is defined.
  • the granularity may be enhanced and the finer granularity TA commend (the one beyond the Rel- 15/16 TA command) may be indicated by the finer TA command field as shown in FIG. 3C.
  • the finer TA commands may be added in the Random- Access Response (e.g., the MAC RAR or the fallbackRAR).
  • the Random- Access Response e.g., the MAC RAR or the fallbackRAR.
  • Incremental TA command may be used when UE 102 is previously uplink synchronized to BS 104 (e.g., gNB) and only occasional adjustments might be needed.
  • a new finer TA command MAC CE with a new (e)LCID may be defined.
  • FIG. 3D shows an example of MAC CE only with a finer TA command.
  • the finer TA command MAC CE may not have TAG ID field and it may apply only for PTAG. Additionally, UE 102 may not be expected to receive this MAC CE from the Secondary Cell Group (SCG).
  • SCG Secondary Cell Group
  • the reason for this restriction is that the reference time refers to the System Frame Number (SFN) of the PCell and only the PTAG of the Master Cell Group (MCG) contains the PCell.
  • SFN System Frame Number
  • MCG Master Cell Group
  • UE 102 may use the TA command for propagation delay compensation. From the received TA command, UE 102 may determine the time difference between a DL frame and a UL frame. The half of the time difference is the propagation delay.
  • UE 102 when UE 102 receives an update of the reference time from the gNB on either SIB9 or the RRC-dedicated message (i.e., DLInformationTransfer), UE 102 may only utilize the TA commands (also finer TA commands if included) from the PTAG of the MCG when its associated timeAlignmentTimer has not expired. This is due to that the reference time refers to the SFN of the PCell and only the PTAG of the MCG contains the PCell.
  • UE 102 may not be required to apply the finer TA command for UL transmission timing but may be configured to only compensate the propagation delay for the reference time.
  • UE 102 may deliver a finer TA command along with the (Rel-15/16) TA command to the upper layer for delay compensation or UE 102 may apply the delay compensation in RRC and deliver the reference time to the upper layer.
  • UE may apply propagation delay compensation (i.e., delivers a finer TA command along with the (Rel-15/16) TA command to the upper layer for delay compensation or applies the delay compensation in RRC and delivers the reference time to the upper layer), if any MAC CE or RAR with a finer TA command is received.
  • propagation delay compensation i.e., delivers a finer TA command along with the (Rel-15/16) TA command to the upper layer for delay compensation or applies the delay compensation in RRC and delivers the reference time to the upper layer
  • UE 102 at the reception of a command with only finer TA command MAC CE (as shown in FIG. 3D), UE 102 does not (re) -start the time alignment timer for PTAG, while for other MAC CEs or RAR in which finer TA commands exist in addition to the legacy TA command, at the reception of the commands, UE 102 may (re)-start the time alignment timer for PTAG.
  • a set of RS may be defined specifically for the purpose of uplink transmission timing estimation.
  • the RS may be Sounding Reference Signals (SRS) and there may be a requirement on the minimum number of physical resource blocks (PRBs).
  • SRS Sounding Reference Signals
  • PRBs physical resource blocks
  • any one or more of tracking reference signals (TRS), enhanced TRS, positioning reference signals (PRS), or enhanced PRS may be used to improve UE 102’s detection of downlink signal timing.
  • TRS tracking reference signals
  • PRS positioning reference signals
  • enhanced PRS may be used to improve UE 102’s detection of downlink signal timing.
  • SRS for positioning or SRS for time synchronization may be used to improve NN 104’s detection of UL signal timing.
  • a pointer to the reference signalling resource may be added.
  • This reference signalling may be configured by the RRC parameter — SRS-Config — of the Primary Serving Cell (PCell).
  • the pointer may contain the srs-ResourceSetld and BWP ID, but not Cell ID.
  • the resource may be any one of aperiodic, semi-periodic, and periodic as configured in the IE SRS-Config.
  • multiple resources may be configured, where each one corresponds to one configured uplink BWP.
  • the resource may be used after the Bandwidth Part (BWP) switching and the concerned BWP is activated.
  • BWP Bandwidth Part
  • DCI Downlink Control Information
  • the RRC SRS configuration for propagation delay compensation may be different from normal SRS configuration or SRS configuration for positioning, e.g., transmitted using a different antenna port, a different power setting, a different BW, a different set of symbols, etc.
  • the granularity of achievable time synchronization accuracy may depend on various parameters and configurations.
  • the granularity achievable of the enhanced TA command may be a function of the downlink SCS of the active BWP, and/or uplink SCS of the active BWP.
  • the granularity achievable of the enhanced TA command may be a function of the configuration parameters of the DL reference signal (e.g., DL PRS and/or DL TRS).
  • the configuration parameters may include bandwidth of the DL RS, frequency domain density of DL RS, time domain density of DL RS, time domain duration of DL RS burst, periodicity of DL RS, etc.
  • the granularity achievable of the enhanced TA command may be a function of the configuration parameters of the UL reference signal (e.g., UL SRS).
  • the configuration parameters may include bandwidth of the UL RS, frequency domain density of UL RS, time domain density of UL RS, periodicity of UL RS, etc.
  • the granularity level may be negotiated between UE and gNB.
  • the gNB may signal the desired granularity level k’ to UE.
  • the UE can reply with the actually realized k’ to the gNB, which may or may not be equal to the desired k’ from gNB.
  • the UE may signal the desired granularity level k’ to gNB.
  • the gNB can reply with the actually realized k’ to the UE, which may or may not be equal to the desired k’ from UE.
  • This k’ value depends on the synchronization accuracy requirement at the application layer (e.g., part of the information in the time sensitive networking (TSN) configuration).
  • TSN time sensitive networking
  • UE may request more than one k values and gNB can reply to the UE that none of them can be supported.
  • the number of bits for finer granularity TA command is consequently (m-k’).
  • the actual TA for UE in this case, may e expressed as
  • T A K is the signaled value (integer) in the message that is contained in the TA command. It is different for different k since the number of bits is different.
  • gNB selects one k value based on UE capability, the SCS of the current activated BWPs, and the available remaining reference signal resources in the cell and etc. In other words, this is a configuration from the gNB.
  • the UE transmission timing error may be reduced.
  • Te the UE transmission timing error
  • the longer Te values are reduced (e.g., halved) while the shorter Te values are left unchanged, as shown in Table 1 (corresponding to Table 7.1.2-1 of Technical Specification 38.133) provided below. Reducing only the longer Te allows reducing the TA error where it is most problematic for achieving the tight time synchronization accuracy.
  • the conditions on Te may be revised to help UE to achieve the tighter requirement.
  • the reduced Te may be applicable only for certain uplink transmissions while existing Te applies for other uplink transmissions. More specifically, the reduced Te may be applicable only to the transmission of SRS and/or PRACH transmission, and not applicable to PUCCH or PUSCH transmission.
  • the reduced Te requirement is applicable only to the transmission of SRS and/or PRACH transmission on PCell, or for at most one UL reference signal configurations in the PCell, etc.
  • the UE when it is the first transmission in a DRX cycle, the UE is required to meet the Te requirement for an initial transmission only if better DL reference is provided.
  • the condition for Te is that at least one SSB is available at the UE during the last T ms, where T ⁇ 160 (ms).
  • the reduced Te may require more advanced UE implementation. Thus, a UE can report its capability in achieving the reduced Te.
  • a UE capability is introduced where the UE can indicate if it can, or cannot, achieve the reduced Te in the relevant condition.
  • a UE capability is introduced where the UE can indicate the level of Te it can achieve, if multiple levels of Te are possible.
  • FIG. 4 is a process 400 performed by a network node 104.
  • the process 400 may begin with step s402.
  • Step s402 comprises transmitting toward a user equipment (UE) an order.
  • Step s404 comprises after transmitting the order, obtaining timing information indicating UE’s uplink signal transmission timing.
  • Step s406 comprises after obtaining the timing information, transmitting toward the UE a message containing a timing advance (TA) command.
  • the TA command is configured to trigger the UE to adjust the UE’s uplink signal transmission timing.
  • TA timing advance
  • the order is a physical downlink control channel (PDCCH) order, and the PDCCH order is transmitted toward the UE regardless of whether the UE and the network node are out of synchronization.
  • PDCCH physical downlink control channel
  • the method further comprises transmitting toward the UE a timer parameter containing a value of a timer.
  • the value of a timer indicates to the UE how long uplink signal transmission timing is considered to be aligned with downlink signal transmission timing, and the PDCCH order is transmitted toward the UE regardless of whether the timer is running or not at the time of transmitting the PDCCH order.
  • the TA command includes a first group of bits and a second group of bits, the first group of bits indicates a first index value, and the second group of bits indicates a second index value, and the first and second index values determine the amount of adjusting the UE’s uplink signal transmission timing.
  • the second group of bits consists of m bits, m is a positive integer, the amount of adjusting the UE’s uplink signal transmission timing is proportional to the first and the second index values, and the amount of adjusting the UE’s uplink signal transmission timing is inversely proportional to m.
  • granularity of the TA command is a function of any one or a combination of the followings: downlink SCS of an active BWP, uplink SCS of the active BWP, bandwidth of DL RS, frequency domain density of DL RS, time domain density of DL RS, time domain duration of DL RS burst, periodicity of DL RS, bandwidth of UL RS, frequency domain density of UL RS, and time domain density of UL RS, periodicity of UL RS.
  • FIG. 5 is a process 500 performed by a user equipment (UE) according to some embodiments.
  • the process 500 may begin with step s502.
  • Step s502 comprises receiving from a network node an order.
  • Step s504 comprises after receiving the order, transmitting toward the network node timing information indicating UE’s uplink signal transmission timing.
  • Step s506 comprises after transmitting the timing information, receiving from the network node a message containing a timing advance (TA) command.
  • Step s508 comprises adjusting the UE’s uplink signal transmission timing based on the TA command.
  • TA timing advance
  • the order is a physical downlink control channel (PDCCH) order, and the PDCCH order is transmitted toward the UE regardless of whether the UE and the network node are out of synchronization.
  • PDCCH physical downlink control channel
  • the method further comprises receiving from the network node a timer parameter containing a value of a timer.
  • the value of a timer indicates to the UE how long uplink signal transmission timing is considered to be aligned with downlink signal transmission timing, and the PDCCH order is transmitted toward the UE regardless of whether the timer is running or not at the time of transmitting the PDCCH order.
  • the TA command includes a first group of bits and a second group of bits, the first group of bits indicates a first index value, and the second group of bits indicates a second index value, and the first and second index values determine the amount of adjusting the UE’s uplink signal transmission timing.
  • the second group of bits consists of m bits, m is a positive integer, the amount of adjusting the UE’s uplink signal transmission timing is proportional to the first and the second index values, and the amount of adjusting the UE’s uplink signal transmission timing is inversely proportional to m.
  • the second group of bits consists of m bits, m is a positive integer, the amount of adjusting the UE’s uplink signal transmission timing is proportional to the first index value, and the amount of adjusting the UE’s uplink signal transmission timing is not affected by m and the second index value.
  • the message containing the TA command is associated with a Primary Timing Advance Group
  • the method further comprises receiving a message containing another timing advance (TA) command
  • the message containing said another TA command is associated with a secondary TAG that is different from the pTAG
  • the method further comprises not adjusting the UE’s uplink signal transmission timing based on said another TA command.
  • TA timing advance
  • granularity of the TA command is a function of any one or a combination of the followings: downlink SCS of an active BWP, uplink SCS of the active BWP, bandwidth of DL RS, frequency domain density of DL RS, time domain density of DL RS, time domain duration of DL RS burst, periodicity of DL RS, bandwidth of UL RS, frequency domain density of UL RS, and time domain density of UL RS, periodicity of UL RS.
  • base station 104 may comprise: processing circuitry (PC) 602, which may include one or more processors (P) 655 (e.g., one or more general purpose microprocessors and/or one or more other processors, such as an application specific integrated circuit (ASIC), field-programmable gate arrays (FPGAs), and the like), which processors may be co-located in a single housing or in a single data center or may be geographically distributed (i.e., base station 104 may be a distributed computing apparatus); at least one network interface 668 comprising a transmitter (Tx) 665 and a receiver (Rx) 667 for enabling base station 104 to transmit data to and receive data from other nodes connected to a network 110 (e.g., an Internet Protocol (IP) network) to which network interface 668 is connected; communication circuitry 648, which is coupled to an antenna arrangement 649
  • PC processing circuitry
  • P processors
  • P processors
  • ASIC application specific integrated circuit
  • FPGAs field-programmable gate arrays
  • CPP 641 includes a computer readable medium (CRM) 642 storing a computer program (CP) 643 comprising computer readable instructions (CRI) 644.
  • CRM 642 may be a non-transitory computer readable medium, such as, magnetic media (e.g., a hard disk), optical media, memory devices (e.g., random access memory, flash memory), and the like.
  • the CRI 644 of computer program 643 is configured such that when executed by PC 602, the CRI causes base station 104 to perform steps described herein (e.g., steps described herein with reference to the flow charts).
  • base station 104 may be configured to perform steps described herein without the need for code. That is, for example, PC 602 may consist merely of one or more ASICs. Hence, the features of the embodiments described herein may be implemented in hardware and/or software.
  • FIG. 7 is a block diagram of UE 102, according to some embodiments.
  • UE 102 may comprise: processing circuitry (PC) 702, which may include one or more processors (P) 755 (e.g., one or more general purpose microprocessors and/or one or more other processors, such as an application specific integrated circuit (ASIC), field-programmable gate arrays (FPGAs), and the like); communication circuitry 748, which is coupled to an antenna arrangement 749 comprising one or more antennas and which comprises a transmitter (Tx) 745 and a receiver (Rx) 747 for enabling UE 102 to transmit data and receive data (e.g., wirelessly transmit/receive data); and a local storage unit (a.k.a., “data storage system”) 708, which may include one or more non-volatile storage devices and/or one or more volatile storage devices.
  • PC processing circuitry
  • P processors
  • ASIC application specific integrated circuit
  • FPGAs field-programmable gate arrays
  • CPP 741 includes a computer readable medium (CRM) 742 storing a computer program (CP) 743 comprising computer readable instructions (CRI) 744.
  • CRM 742 may be a non-transitory computer readable medium, such as, magnetic media (e.g., a hard disk), optical media, memory devices (e.g., random access memory, flash memory), and the like.
  • the CRI 744 of computer program 743 is configured such that when executed by PC 702, the CRI causes UE 102 to perform steps described herein (e.g., steps described herein with reference to the flow charts).
  • UE 102 may be configured to perform steps described herein without the need for code. That is, for example, PC 602 may consist merely of one or more ASICs. Hence, the features of the embodiments described herein may be implemented in hardware and/or software.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé mis en œuvre par un nœud de réseau. Le procédé comprend la transmission en destination un équipement utilisateur (EU) d'une commande. Le procédé comprend en outre après la transmission de la commande, l'obtention d'informations de synchronisation indiquant la synchronisation de transmission de signal sur liaison montante de l'EU. Le procédé comprend en outre, après l'obtention des informations de synchronisation, la transmission en destination de l'EU d'un message contenant une instruction d'avance de synchronisation (TA). La commande TA est configurée pour déclencher l'EU pour ajuster la synchronisation de transmission de signal sur liaison montante de l'EU.
PCT/EP2021/077966 2020-10-16 2021-10-08 Procédés et systèmes de compensation de retard de propagation WO2022078920A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130114576A1 (en) * 2011-11-03 2013-05-09 Pantech Co., Ltd. Apparatus and method for performing uplink synchronization in multiple component carrier system
EP2756719B1 (fr) * 2011-09-12 2020-01-15 Qualcomm Incorporated Prise en charge de multiples groupes d'avance temporelle pour un équipement d'utilisateur dans une agrégation de porteuses d'un réseau lte
US20200196262A1 (en) * 2011-05-27 2020-06-18 Apple Inc. Apparatus and Method for Performing Uplink Synchronization Wireless Communication System

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200196262A1 (en) * 2011-05-27 2020-06-18 Apple Inc. Apparatus and Method for Performing Uplink Synchronization Wireless Communication System
EP2756719B1 (fr) * 2011-09-12 2020-01-15 Qualcomm Incorporated Prise en charge de multiples groupes d'avance temporelle pour un équipement d'utilisateur dans une agrégation de porteuses d'un réseau lte
US20130114576A1 (en) * 2011-11-03 2013-05-09 Pantech Co., Ltd. Apparatus and method for performing uplink synchronization in multiple component carrier system

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