WO2018133645A1 - 定时提前维护方法、装置及系统 - Google Patents

定时提前维护方法、装置及系统 Download PDF

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Publication number
WO2018133645A1
WO2018133645A1 PCT/CN2017/119595 CN2017119595W WO2018133645A1 WO 2018133645 A1 WO2018133645 A1 WO 2018133645A1 CN 2017119595 W CN2017119595 W CN 2017119595W WO 2018133645 A1 WO2018133645 A1 WO 2018133645A1
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Prior art keywords
terminal
indication information
state
inactive state
network side
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PCT/CN2017/119595
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English (en)
French (fr)
Inventor
张冬英
吴昱民
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中兴通讯股份有限公司
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Publication of WO2018133645A1 publication Critical patent/WO2018133645A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present disclosure relates to the field of communications, for example, to a Timing Advance (TA) maintenance method, apparatus, and system.
  • TA Timing Advance
  • the Long Term Evaluation (LTE) network includes an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and a Core Network (CN).
  • the E-UTRAN includes an evolved Node B (eNB).
  • the CN includes a Mobile Management Entity (MME) and a Serving Gateway (S-GW).
  • MME Mobile Management Entity
  • S-GW Serving Gateway
  • the eNB and the CN are connected through the S1 port, and the eNBs can be connected through the X2 port.
  • One eNB can manage one or more cells (Cells).
  • An interface between a user equipment (also called a User Equipment (UE)) and a cell is called a Uu interface (or an air interface).
  • UE User Equipment
  • orthogonal UEs have orthogonal multiple access in time-frequency, that is, uplink transmissions from different UEs in the same cell do not interfere with each other.
  • the base station requires the UE signal from the same subframe but different frequency domain resources (different resource blocks (RBs)) to arrive at the base station. Basically aligned.
  • the base station can correctly decode the uplink data by receiving the uplink data sent by the UE within the range of the Cyclic Prefix (CP). Therefore, the uplink synchronization requires that the signals of different UEs from the same subframe arrive at the base station.
  • CP Cyclic Prefix
  • LTE proposes a mechanism of Uplink Timing Advance.
  • the Timing Advance value is a negative offset between the start time of receiving the downlink subframe and the time of transmitting the uplink subframe.
  • the base station can control the time when the uplink signals from different UEs arrive at the base station by appropriately controlling the offset of each UE.
  • Fig. 2(a) is a schematic diagram showing no timing advance
  • Fig. 2(b) is a schematic diagram showing timing advance. As shown in FIG. 2(b), for a UE that is far away from the base station (ie, terminal 2), since there is a large transmission delay, the UE (ie, terminal 1) that is closer to the base station needs to transmit uplink data in advance.
  • the timing advance may be unnecessary, that is, the TA value is 0 at this time.
  • the timing of the uplink subframe and the downlink subframe on the base station side is the same, and there is an offset between the uplink subframe of the UE side and the timing of the downlink subframe.
  • different UEs have different uplink timing advance values, that is, the uplink timing advance value is a configuration on the UE side.
  • the base station obtains an uplink timing advance value of each UE by measuring an uplink signal, and sends the obtained uplink timing advance value to the UE by using a Timing Advance Command (TAC).
  • TAC Timing Advance Command
  • Signals sent by the UE for example, Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), Channel Quality Indication (CQI), acknowledgment/non-acknowledgement (ACK/NACK)
  • SRS Sounding Reference Signal
  • DMRS Demodulation Reference Signal
  • CQI Channel Quality Indication
  • ACK/NACK acknowledgment/non-acknowledgement
  • the physical uplink shared channel (PUSCH) can be used to measure the uplink timing advance value.
  • the base station can send the TAC to the UE in the following two ways: In the random access process, the base station determines the timing advance value by measuring the received preamble and adopts a random access response (RAR). The Timing Advance Command field is sent to the UE; the other is in the Radio Resource Control (RRC) connection state, and the base station needs to maintain the timing advance information (this is because the timing of the uplink signal arriving at the base station may send changes) For example, the terminal moves at high speed, the transmission path disappears, the crystal oscillator shifts, etc.).
  • RRC Radio Resource Control
  • the base station uses the closed-loop mechanism to adjust the uplink timing advance value through the TAC.
  • the TAC is sent to the UE through the Timing Advance Command Media Access Control (MAC) Control Element (CE).
  • CE Timing Advance Command Media Access Control
  • the UE After receiving the TAC, the UE starts to adjust from the subframe n+6. Since the adjustment amount of the uplink timing advance value is relative to the received downlink subframe, the UE needs to receive the TAC when the UE does not receive the TAC. Track the changes in the downlink timing to automatically adjust the timing of the upstream transmission.
  • MAC Timing Advance Command Media Access Control
  • the base station configures a timer (in the MAC layer, called Time Alignment Timer (TAT)) to the UE through RRC signaling, and the UE uses the timer to determine whether the uplink is synchronized at the MAC layer.
  • the timer has a cell-specific level and a UE-specific level.
  • the base station configures a cell-specific timer through the timeAlignmentTimerCommon field of the SystemInformationBlockType2; and configures the UE-specific timer by the timeAlignmentTimerDedicated field of the MAC-MainConfig. If the UE configures a UE-specific level timer, the UE uses the timer value, otherwise the UE uses a cell-specific level timer value.
  • the UE when the UE receives the TAC (from the RAR or Timing Advance Command MAC CE), the UE will start or restart the timer. If the timer is out of time, the uplink is out of synchronization, and the UE clears the Hybrid Automatic Repeat ReQuest (HARQ) buffer to notify the RRC layer to release the Physical Uplink Control Channel (PUCCH) or SRS. And clear any configured downlink assignment (DL assignment) and uplink grant (UL grant).
  • HARQ Hybrid Automatic Repeat ReQuest
  • PUCCH Physical Uplink Control Channel
  • UL grant uplink grant
  • the UE can only initiate a random access procedure.
  • the UE needs to communicate with the base station, and first needs to access the base station, that is, initiate a random access procedure.
  • the contention-based random access procedure generally adopts the following four steps.
  • step 301 the UE learns the available preamble sequence for random access and the time-frequency location of the transmission preamble sequence through system information or RRC signaling, and then randomly selects the preamble sequence and the transmission preamble sequence within the available resources. Time-frequency position and send a preamble sequence to the base station.
  • the base station infers the Random Access-Radio Network Temporary Identity (RA-RNTI) that the UE may adopt by using the time-frequency location of the random access preamble sequence, and decodes the preamble by using the RA-RNTI.
  • the sequence after the base station successfully decodes the preamble sequence, returns a random access response to the UE, where the random access response carries information such as an uplink grant.
  • step 303 the UE sends uplink data on the uplink authorized resource, and carries information such as the identifier of the UE.
  • step 304 the base station parses the uplink data on the uplink authorized resource, confirms the UE, resolves the conflict, and sends the contention resolution identifier to the UE.
  • the UE may send data to the base station in an unauthorized manner (Grant free). As shown in Figure 4, the following two steps are included.
  • step 401 the UE selects a resource and sends uplink data in an unauthorised resource pool.
  • step 402 after the base station parses the uplink data, it responds with a response or data.
  • Release 14 (Release 14, R14) is in the process of standardizing Light Connected UEs and 5G inactive state research.
  • the "lighter" connection state or the inactive state can be maintained between the UE and the network device.
  • the UE is disconnected from the network device, and the S1 connection of the UE is always maintained.
  • the UE in the inactive state needs to transmit data, the UE and the network device need to be re-established. connection.
  • the UE can directly send uplink data.
  • the UE In order to ensure correct data analysis, the UE must have an accurate TA value.
  • the update of the TA value is only for the connected terminal. The problem related to the TA when the terminal is in the inactive state or the idle state has not been solved. For example, how does the terminal in the inactive state or the idle state keep the TAT running? How to maintain the uplink synchronization of the terminal in the inactive or idle state.
  • the embodiment provides a timing advance (TA) maintenance method, device, and system, which can maintain an uplink timing advance of a terminal in an inactive state or an idle state, thereby saving a large amount of signaling and overhead.
  • TA timing advance
  • a TA maintenance method includes:
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected, and the interface between the first network device and the second network device on the network side remains connected.
  • the TA indication information may be used to indicate at least one of: a time alignment timer (TAT) when the terminal is in an inactive state or an idle state, and the terminal is in an inactive state or an idle state.
  • TAT time alignment timer
  • the TAT indicated by the TA indication information may include one of the following: a TAT running when the terminal is in a connected state, an inactive state dedicated to the terminal, or a TAT in an idle state.
  • the terminal determines, according to the TA indication information, a TA value used in an inactive state or an idle state, including :
  • the terminal After entering the inactive state or the idle state, the terminal runs the TAT indicated by the TA indication information according to the TA indication information, and determines the TA value maintained during the TAT operation.
  • the TA maintenance method further includes: when the TAT indicated by the TA indication information is running, the TA maintenance method further includes:
  • the terminal periodically sends uplink information
  • TAC timing advance command
  • the TA value is adjusted according to the received TAC.
  • the TAC is sent by the network side by using a broadcast mode or a paging mode.
  • the TA indication information is carried in signaling indicating that the terminal enters an inactive state or an idle state, or is carried in separate signaling.
  • a TA maintenance method includes:
  • the network side sends the TA indication information to the terminal, so that the terminal determines the TA value used in the inactive state or the idle state according to the TA indication information;
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected, and the interface between the first network device and the second network device on the network side remains connected.
  • the TA indication information may be used to indicate at least one of: a TAT that is used when the terminal is in an inactive state or an idle state, and a TA value that is used when the terminal is in an inactive state or an idle state.
  • the sending, by the network side terminal, the TA indication information may include one of the following:
  • the network side carries the TA indication information in signaling that indicates that the terminal enters an inactive state or an idle state;
  • the network side separately sends the TA indication information.
  • the TA maintenance method may further include:
  • the network side After receiving the uplink information sent by the terminal in the inactive or idle state, the network side sends a TAC to the terminal to adjust the TA value used by the terminal.
  • the sending the TAC to the terminal may include:
  • the TAC is transmitted by broadcast or paging.
  • a TA maintenance device is applied to a terminal, including:
  • the first receiving module is configured to receive the TA indication information sent by the network side;
  • a first processing module configured to determine, according to the TA indication information, a TA value that is used when the terminal is in an inactive state or an idle state;
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected, and the interface between the first network device and the second network device on the network side remains connected.
  • the TA indication information may be used to indicate at least one of: a TAT that is used when the terminal is in an inactive state or an idle state, and a TA value that is used when the terminal is in an inactive state or an idle state.
  • the first processing module is configured to determine, according to the TA indication information, that the terminal is not in the following manner, when the TA indication information indicates that the terminal is in an inactive state or an idle state.
  • the TAT indicated by the TA indication information is run, and the TA value maintained during the TAT operation is determined.
  • the TA maintenance device further includes:
  • the first sending module is configured to periodically send uplink information after the terminal enters an inactive state or an idle state;
  • a second receiving module configured to receive a TAC sent by the network side, where the TAC is sent by the network side after receiving the uplink information
  • the second processing module is configured to adjust the TA value according to the received TAC.
  • a TA maintenance device is applied to the network side, including:
  • the second sending module is configured to send the TA indication information to the terminal, so that the terminal determines, according to the TA indication information, a TA value used in an inactive state or an idle state;
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected, and the interface between the first network device and the second network device on the network side remains connected.
  • the TA indication information may be used to indicate at least one of: a TAT that is used when the terminal is in an inactive state or an idle state, and a TA value that is used when the terminal is in an inactive state or an idle state.
  • the TA maintenance device may further include:
  • a third receiving module configured to receive uplink information sent by a terminal that is in an inactive state or an idle state
  • the third sending module is configured to send a TAC to the terminal after the third receiving module receives the uplink information sent by the terminal in the inactive or idle state, to adjust the TA value used by the terminal.
  • a TA maintenance system includes: a terminal and a first network device on the network side;
  • the first network device on the network side is configured to send TA indication information to the terminal;
  • the terminal is configured to determine, according to the TA indication information, a TA value used in an inactive state or an idle state;
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected, and the interface between the first network device and the second network device on the network side remains connected.
  • the terminal is further configured to send uplink information to the first network device in an inactive state or an idle state;
  • the first network device is further configured to send a TAC to the terminal according to the uplink information, to adjust a TA value adopted by the terminal.
  • a computer readable storage medium storing computer executable instructions that, when executed by a processor, implement a TA maintenance method applied to a terminal side.
  • a computer readable storage medium storing computer executable instructions that, when executed by a processor, implement a TA maintenance method applied to a network side.
  • a terminal device comprising one or more processors, a memory and one or more programs, the one or more programs being stored in a memory, and when executed by one or more processors, performing the TA Maintenance method.
  • a network device comprising one or more processors, a memory and one or more programs, the one or more programs being stored in a memory, when executed by one or more processors, performing the TA described above Maintenance method.
  • a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to execute Any of the above TA maintenance methods.
  • the TA indication information is sent to the terminal through the network side, and the TA in the inactive state or the idle state is maintained, so that the terminal in the inactive state or the idle state can obtain the determined TA value and the terminal can directly send the terminal.
  • Uplink data which saves a lot of signaling and overhead.
  • Figure 1 is a diagram of an LTE network architecture
  • timing advance is a schematic diagram of comparison between timing advance and timing advance
  • FIG. 3 is a schematic diagram of a contention based random access procedure in an LTE system
  • FIG. 4 is a schematic diagram of an unauthorized random access procedure in an LTE system
  • FIG. 5 is a flowchart of a timing advance maintenance method according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a pattern moment when a network side sends a TAC in the embodiment
  • FIG. 7 is a schematic diagram 1 of a timing advance maintenance device according to an embodiment of the present invention.
  • FIG. 8 is a second schematic diagram of a timing advance maintenance device according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of another timing advance maintenance apparatus according to an embodiment.
  • FIG. 10 is a schematic structural diagram of hardware of a terminal device according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of hardware of a network device according to an embodiment of the present disclosure.
  • This embodiment provides a timing advance maintenance method, as shown in FIG. 5, including the following steps.
  • step 501 the terminal receives the TA indication information sent by the network side.
  • step 502 the terminal determines the TA value to be used in the inactive state or the idle state according to the TA indication information.
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected and the interface between the first network device and the second network device on the network side remains connected.
  • the first network device may be a base station
  • the second network device may be a core network
  • the interface between the terminal and the first network device is a Uu interface, and between the first network device and the second network device.
  • the interface is the S1 port.
  • the TA indication information may be carried in the signaling indicating that the terminal enters the inactive state or the idle state, or is carried in a separate signaling.
  • the network side separately sends an RRC message carrying the TA indication information to the terminal.
  • the TA indication information may be used to indicate at least one of the following: a TAT that is used when the terminal is in an inactive state or an idle state, and a TA value that is used when the terminal is in an inactive state or an idle state.
  • the TAT indicated by the TA indication information may include one of the following: a TAT running when the terminal is in the connected state, an inactive state dedicated to the terminal, or a TAT in the idle state.
  • the TA value indicated by the TA indication information may be 0.
  • the cell itself is very small.
  • the step 502 may include the following.
  • the terminal After entering the inactive state or the idle state, the terminal runs the TAT indicated by the TA indication information according to the TA indication information, and determines the TA value maintained during the TAT operation.
  • the terminal may adopt the TA value of the connected state in the inactive state or the idle state, and continue to maintain the running state of the TAT; when the TA indicates When the TAT indicated by the information is specifically defined for the inactive or idle state, the terminal may start the TAT in the inactive state or the idle state.
  • the TA value used by the terminal may be pre-configured, or It is sent by the base station through broadcast or paging.
  • the terminal may determine the TA value maintained during the TAT operation, and directly send the uplink data according to the TA value.
  • the terminal can only maintain the operation of the TAT and does not update the TA value.
  • the advantage of this situation is that the terminal and the network side do not need to frequently exchange TA related information, and the signaling load is low; the disadvantage is that once the TAT times out, the terminal loses. A valid TA value.
  • the TA maintenance method of the present embodiment may further include the following.
  • a terminal that is in an inactive state or an idle state periodically transmits uplink information.
  • the TA value can be updated for the terminal in the inactive state or the idle state.
  • the TAC can be sent by the network side by means of broadcast or paging.
  • this embodiment further provides a TA maintenance method, including the following content.
  • the network side sends the TA indication information to the terminal, so that the terminal determines the TA value used in the inactive state or the idle state according to the TA indication information.
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected and the interface between the first network device and the second network device on the network side remains connected.
  • the first network device may be a base station
  • the second network device may be a core network
  • the interface between the terminal and the first network device is a Uu interface, and between the first network device and the second network device.
  • the interface is the S1 port.
  • the TA indication information may be used to indicate at least one of the following: a TAT running when the terminal is in an inactive state or an idle state, and a TA value used when the terminal is in an inactive state or an idle state (for example, the TA value is 0).
  • the TAT indicated by the TA indication information may include one of the following: a TAT running when the terminal is in the connected state, an inactive state dedicated to the terminal, or a TAT in the idle state.
  • the network side sends the TA indication information to the terminal, and may include one of the following.
  • the network side carries the TA indication information in the signaling indicating that the terminal enters the inactive state or the idle state. And, the network side separately sends the TA indication information, for example, sends an RRC message carrying the TA indication information separately.
  • the TA maintenance method of the present embodiment may further include the following.
  • the network side After receiving the uplink information sent by the terminal in the inactive or idle state, the network side sends the TAC to the terminal to adjust the TA value used by the terminal.
  • the terminal in the inactive state or the idle state may periodically trigger the transmission of uplink information (for example, data information, measurement information, control information, and the like), and the network side adjusts the TA value after receiving the uplink information. And sent to the terminal through the TAC, the terminal will adjust the TA value after receiving the TAC.
  • uplink information for example, data information, measurement information, control information, and the like
  • the network side can send the TAC by broadcast or paging.
  • the TA indication information sent by the network side is sent to the UE along with the RRC connection suspension command; when the UE is in the inactive state, the adopted TA value is the TA value of the connection state, and the TA value is not updated.
  • This embodiment includes the following steps.
  • step 11 when the UE is in the connected state, the network side sends an RRC connection suspend command to instruct the UE to enter an inactive state, and at the same time, adds an indication of the TAT operation to maintain the connected state in the command (ie, “keep Connected” TAT running indication”), used to indicate that the UE adopts the TA value of the connected state when in the inactive state and continues to maintain the TAT operation of the connected state.
  • an indication of the TAT operation to maintain the connected state in the command ie, “keep Connected” TAT running indication”
  • step 12 after receiving the above RRC connection suspension command, the UE enters an inactive state and continues to maintain the TAT operation of the connected state.
  • step 13 in the case that the UE has uplink data transmission and the TAT has not timed out, the UE directly sends uplink data to the network side in the configured resource.
  • the network side separately sends the TA indication information to the UE; when the UE is in the inactive state, the adopted TA value is the TA value of the connected state, and the TA value is not updated.
  • This embodiment includes the following steps.
  • step 21 when the UE is in the connected state, the network side sends an RRC connection suspend command to instruct the UE to enter the inactive state, and the network side separately sends an RRC message (ie, "keep Connected TAT running indication"). Instructing the UE to adopt the TA value of the connected state after entering the inactive state and continue to maintain the TAT operation of the connected state.
  • step 22 after receiving the RRC connection suspension command, the UE enters an inactive state, and after receiving the RRC message, continues to maintain the TAT operation of the connected state;
  • step 23 when the UE has uplink data transmission and the TAT has not timed out, the UE directly sends uplink data to the network side in the configured resource.
  • the TA indication information sent by the network side is sent to the UE along with the RRC connection suspension command; when the UE is in the inactive state, the TA value is 0, and the TA value is not updated.
  • This embodiment includes the following steps.
  • step 31 when the UE is in the connected state, the network side sends an RRC connection suspend command to instruct the UE to enter the inactive state, and at the same time, adds an indication that the terminal does not perform timing advance in the command ("no TA indication” or "small cell indication”), used to indicate that the TA value adopted by the UE in the inactive state is 0.
  • step 32 after receiving the RRC connection suspension command, the UE enters an inactive state and saves the TA value.
  • step 33 when the UE has uplink data transmission, the UE directly sends uplink data to the network side in the configured resource.
  • the TA indication information sent by the network side is sent to the UE together with the RRC connection suspension command; when the UE is in the inactive state, the adopted TA value is the TA value of the connection state, and the TA value is updated; the TA value is updated.
  • the TAC in the process is sent by paging.
  • This embodiment includes the following steps.
  • step 41 when the UE is in the connected state, the network side sends an RRC connection suspend command to instruct the UE to enter an inactive state, and at the same time, adds an indication of the TAT operation to maintain the connected state in the command ("keep Connected TAT"
  • the running indication is used to indicate that the UE adopts the TA value of the connected state when in the inactive state and continues to maintain the TAT operation of the connected state.
  • step 42 after receiving the above RRC connection suspension command, the UE enters an inactive state and continues to maintain the TAT operation of the connected state.
  • the UE needs to monitor the TAC before the TAT expires.
  • step 43 the UE sends the uplink information (which may be any uplink transmission information) in the period T1.
  • Step 44 After receiving the uplink information of the UE, the network side adjusts the TA value of the UE, and sends the TAC to the UE at the pre-configured “Paging” time.
  • the transmission time of the TAC may be pre-configured, and is sent before the TAT timeout (the network side also maintains a timer similar to the TAT on the UE side) at a fixed pattern timing, as shown in FIG. 6.
  • the value carried by the TAC may be an absolute value or a relative value (ie, an adjustment amount relative to the TA value maintained by the UE side).
  • step 45 the UE monitors the TAC at a plurality of predefined times. After receiving the TAC on the network side, the TA value is adjusted according to the received TAC.
  • the adjustment amount such as direct superposition or filtering mode
  • the TA indication information sent by the network side is sent to the UE along with the RRC connection release command; when the UE is in the idle state, the adopted TA value is the TA value of the connected state, and the TA value is not updated.
  • This embodiment includes the following steps.
  • step 51 when the UE is in the connected state, the network side sends an RRC connection release command to instruct the UE to enter the idle state, and at the same time, the instruction to increase the TAT operation of the connected state ("keep Connected TAT running indication") is added in the command. It is used to indicate the TAT operation when the UE adopts the TA value of the connected state in the idle state and continues to maintain the connected state.
  • step 52 after receiving the RRC connection release command, the UE enters an idle state and continues to maintain the TAT operation of the connected state.
  • step 53 in the case that the UE has uplink data transmission and the TAT has not timed out, the UE directly sends uplink data to the network side in the configured resource.
  • this embodiment provides a TA maintenance device, which is applied to a terminal, as shown in FIG. 7, and includes the following modules.
  • the first receiving module 701 is configured to receive the TA indication information sent by the network side.
  • the first processing module 702 is configured to determine, according to the TA indication information, a TA value that is used when the terminal is in an inactive state or an idle state.
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected and the interface between the first network device and the second network device on the network side remains connected.
  • the first network device may be a base station
  • the second network device may be a core network
  • the interface between the terminal and the first network device is a Uu interface, and between the first network device and the second network device.
  • the interface is the S1 port.
  • the TA indication information may be carried in the signaling indicating that the terminal enters the inactive state or the idle state, or is carried in a separate signaling.
  • the network side separately sends an RRC message carrying the TA indication information to the terminal.
  • the TA indication information may be used to indicate at least one of the following: a TAT running when the terminal is in an inactive state or an idle state, and a TA value used when the terminal is in an inactive state or an idle state (for example, the TA value is 0).
  • the TAT indicated by the TA indication information may include one of the following: a TAT running when the terminal is in the connected state, an inactive state dedicated to the terminal, or a TAT in the idle state.
  • the first processing module 702 is configured to determine, according to the TA indication information, the TA adopted by the terminal in the inactive state or the idle state when the TA indication information indicates that the terminal is in an inactive state or an idle state. Value: After the terminal enters the inactive state or the idle state, according to the TA indication information, the TAT indicated by the TA indication information is run, and the TA value maintained during the TAT operation is determined.
  • the TA maintenance apparatus may further include the following modules.
  • the first sending module 703 is configured to periodically send uplink information after the terminal enters an inactive state or an idle state.
  • the second receiving module 704 is configured to receive a TAC sent by the network side, where the TAC is sent by the network side after receiving the uplink information.
  • the second processing module 705 is configured to adjust the TA value according to the received TAC.
  • the TAC can be sent by the network side by means of broadcast or paging.
  • the embodiment further provides a TA maintenance device, which is applied to the network side.
  • the second sending module 901 is configured to send the TA indication information to the terminal, so that the terminal determines the inactive state according to the TA indication information. Or the TA value used in the idle state.
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected and the interface between the first network device and the second network device on the network side remains connected.
  • the first network device may be a base station
  • the second network device may be a core network
  • the interface between the terminal and the first network device is a Uu interface, and between the first network device and the second network device.
  • the interface is the S1 port.
  • the TA indication information may be used to indicate at least one of the following: a TAT running when the terminal is in an inactive state or an idle state, and a TA value used when the terminal is in an inactive state or an idle state (for example, the TA value is 0).
  • the TAT indicated by the TA indication information may include one of the following: a TAT running when the terminal is in the connected state, an inactive state dedicated to the terminal, or a TAT in the idle state.
  • the second sending module 901 may be configured to send the TA indication information to the terminal by using one of the following manners: carrying the TA indication information in the signaling indicating that the terminal enters the inactive state or the idle state; and separately transmitting the TA indication information.
  • the TA maintenance device of the present embodiment may further include the following modules.
  • the third receiving module 902 is configured to receive uplink information sent by the terminal in an inactive state or an idle state.
  • the third sending module 903 is configured to send the TAC to the terminal after the third receiving module 902 receives the uplink information sent by the terminal in the inactive or idle state, to adjust the TA value used by the terminal.
  • the embodiment further provides a TA maintenance apparatus, which is applied to a terminal, including a processor and a memory storing processor-executable instructions, and when the instruction is executed by the processor, performs the following operations.
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected and the interface between the first network device and the second network device on the network side remains connected.
  • the TA indication information may be used to indicate at least one of the following: a TAT that is used when the terminal is in an inactive state or an idle state, and a TA value that is used when the terminal is in an inactive state or an idle state.
  • the embodiment further provides a TA maintenance apparatus, which is applied to the network side, and includes a processor and a memory storing processor-executable instructions. When the instructions are executed by the processor, the following operations are performed.
  • the TA indication information is sent to the terminal, so that the terminal determines the TA value used in the inactive state or the idle state according to the TA indication information.
  • the inactive state refers to a state in which the interface between the terminal and the first network device on the network side is disconnected and the interface between the first network device and the second network device on the network side remains connected.
  • the TA indication information may be used to indicate at least one of the following: a TAT that is used when the terminal is in an inactive state or an idle state, and a TA value that is used when the terminal is in an inactive state or an idle state.
  • the embodiment further provides a TA maintenance system, including: a terminal and a first network device on the network side; wherein, the first network device is configured to send TA indication information to the terminal; and the terminal is configured to determine that the information is inactive according to the TA indication information.
  • the TA value used in the state or idle state.
  • the inactive state refers to a state in which the interface between the terminal and the first network device is disconnected and the interface between the first network device and the second network device on the network side remains connected.
  • the first network device may be a base station
  • the second network device may be a core network
  • the interface between the terminal and the first network device is a Uu interface, and between the first network device and the second network device.
  • the interface is the S1 port.
  • the terminal may be further configured to send the uplink information to the first network device in the inactive state or the idle state.
  • the first network device is further configured to send the TAC to the terminal according to the received uplink information, to adjust the TA value used by the terminal.
  • the terminal may refer to the description of the embodiment shown in FIG. 7 or FIG. 8.
  • the first network device may refer to the description of the embodiment shown in FIG. 9.
  • the embodiment further provides a computer readable storage medium storing computer executable instructions, which are implemented by the processor to implement a timing advance maintenance method applied to the terminal side.
  • the embodiment further provides a computer readable storage medium storing computer executable instructions, which are implemented by the processor to implement a timing advance maintenance method applied to the network side.
  • FIG. 10 is a schematic structural diagram of a hardware of a terminal device according to the embodiment.
  • the terminal device includes: one or more processors 101 and a memory 102.
  • One processor 101 is taken as an example in FIG.
  • the terminal device may further include: an input device 103 and an output device 104.
  • the processor 101, the memory 102, the input device 103, and the output device 104 in the terminal device may be connected by a bus or other means, and the bus connection is taken as an example in FIG.
  • the input device 103 can receive input numeric or character information
  • the output device 104 can include a display device such as a display screen.
  • FIG. 11 a hardware structure diagram of a network device according to this embodiment is shown in FIG. 11.
  • the network device includes: a processor 111 and a memory 112; and a communication interface 113 and a bus 114.
  • the processor 111, the memory 112, and the communication interface 113 can complete communication with each other through the bus 114.
  • the communication interface 113 can be used for information transmission.
  • the processor 111 can call logic instructions in the memory 112 to perform any of the methods of the above embodiments.
  • the memory 102 and the memory 112 may include a storage program area and a storage data area, and the storage program area may store an operating system and an application required for at least one function.
  • the storage data area can store data and the like created according to the use of the electronic device.
  • the memory may include, for example, a volatile memory of a random access memory, and may also include a non-volatile memory. For example, at least one disk storage device, flash memory device, or other non-transitory solid state storage device.
  • the logic instructions in memory 102 and memory 112 described above can be implemented in the form of software functional units and sold or used as separate products, the logic instructions can be stored in a computer readable storage medium.
  • the technical solution of the present disclosure may be embodied in the form of a computer software product, which may be stored in a storage medium, and includes a plurality of instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) All or part of the steps of the method described in this embodiment are performed.
  • the storage medium may be a non-transitory storage medium or a transitory storage medium.
  • the non-transitory storage medium may include: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. medium.
  • All or part of the process of implementing the foregoing embodiment may be performed by a computer program to indicate related hardware, and the program may be stored in a non-transitory computer readable storage medium, and when the program is executed, may include The flow of an embodiment of the above method.
  • All or part of the above steps may be performed by a program to instruct related hardware (eg, a processor), which may be stored in a computer readable storage medium such as a read only memory, a magnetic disk, or an optical disk.
  • a program to instruct related hardware eg, a processor
  • a computer readable storage medium such as a read only memory, a magnetic disk, or an optical disk.
  • all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits.
  • a plurality of modules or units in the foregoing embodiments may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, being executed by a processor and stored in a memory. Programs/instructions to implement their respective functions.
  • the timing advance TA maintenance method and apparatus sends TA indication information through the network side terminal, and maintains the TA when the terminal is in an inactive state or an idle state, so that the terminal in the inactive state or the idle state can obtain the determined TA.
  • the value and the terminal can directly send the uplink data, thereby saving a lot of signaling and overhead.

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Abstract

一种定时提前维护方法、装置及系统；上述定时提前维护方法包括：终端接收网络侧发送的TA指示信息；终端根据TA指示信息，确定在非激活态或者空闲态时采用的TA值；其中，非激活态指终端与网络侧的第一网络设备之间的接口断开且第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。

Description

定时提前维护方法、装置及系统 技术领域
本公开涉及通信领域，例如涉及一种定时提前(Timing Advance，TA)维护方法、装置及系统。
背景技术
长期演进(Long Term Evaluation，LTE)网络包括演进的通用陆地无线接入网(Evolved Universal Terrestrial Radio Access Network，E-UTRAN)以及核心网(Core Network，CN)。如图1所示，E-UTRAN包括演进基站(evolved Node B，eNB)。CN包括移动管理实体(Mobile Management Entity，MME)和服务网关(Serving Gateway，S-GW)等。eNB和CN之间通过S1口连接，eNB之间可通过X2口连接。一个eNB可以管理一个或多个小区(Cell)。用户设备(也叫终端(User Equipment，UE))与小区之间的接口称为Uu口(或称空口)。
LTE系统中，上行传输的一个重要特征是不同UE在时频上正交多址接入(orthogonal multiple access)，即来自同一小区的不同UE的上行传输之间互不干扰。为了保证上行传输的正交性，避免小区内(intra-cell)干扰，基站要求来自同一子帧、但频域资源不同(不同的资源块(Resource Block，RB))的UE信号到达基站的时间基本上是对齐的。基站只要在循环前缀(Cyclic Prefix，CP)范围内接收到UE所发送的上行数据，就能够正确地解码上行数据，因此，上行同步要求来自同一子帧的不同UE的信号到达基站的时间都落在CP之内。为了保证接收侧(基站侧)的时间同步，LTE提出了上行定时提前(Uplink Timing Advance)的机制。在UE侧看来，定时提前(Timing Advance)值是终端接收到下行子帧的起始时间与传输上行子帧的时间之间的一个负偏移(negative offset)。基站通过适当地控制每个UE的偏移，可以控制来自不同UE的上行信号到达基站的时间。图2(a)为没有进行定时提前的示意图，图2(b)为进 行定时提前的示意图。如图2(b)所示，对于离基站较远的UE(即终端2)，由于有较大的传输延迟，就需要比离基站较近的UE(即终端1)提前发送上行数据。
此外，若小区本身非常小，传输时延非常小，则定时提前有可能是不需要的，也就是说这时TA值为0。
从图2(b)中可以看出，基站侧的上行子帧和下行子帧的定时(timing)是相同的，而UE侧的上行子帧和下行子帧的timing之间有偏移。而且，不同UE有不同的上行定时提前值，也即上行定时提前值是UE侧的配置。
基站通过测量上行信号得到每个UE的上行定时提前值，并将得到的上行定时提前值通过定时提前命令(Timing Advance Command，TAC)发给UE。UE发送的信号(比如，探测参考信号(Sounding Reference Signal，SRS)、解调参考信号(Demodulation Reference Signal，DMRS)、信道质量指示(Channel Quality Indication，CQI)、确认/非确认(ACK/NACK)、物理上行共享信道(Physical Uplink Shared Channel，PUSCH)等)可用于测量上行定时提前值。
基站可以通过以下两种方式给UE发送TAC：一种是随机接入过程中，基站通过测量接收到的前导(preamble)来确定定时提前值，并通过随机接入响应(Random Access Response，RAR)中的Timing Advance Command字段发送给UE；另一种是在无线资源控制(Radio Resource Control，RRC)连接态，基站需要对定时提前信息进行维护(这是由于上行信号到达基站的timing可能会发送变化，比如终端高速移动、传输路径消失、晶振偏移等等)。
LTE系统中，基站采用闭环机制通过TAC进行上行定时提前值的调整，TAC是通过Timing Advance Command媒体访问控制(Media Access Control，MAC)控制单元(Control Element，CE)发送给UE的。UE收到TAC后，会从子帧n+6开始调整，由于上行定时提前值的调整量是相对于接收到的下行子帧的timing的，因此，在UE没有收到TAC的时候，UE需要跟踪下行timing的变化，以便自动调整上行传输的timing。
基站会通过RRC信令给UE配置一个定时器(timer)(在MAC层，称为时间对齐定时器(Time Alignment Timer，TAT))，UE使用该timer在MAC层确定上行是否同步。该timer有小区特定(Cell-specific)级别和UE特定(UE-specific)级别之分。基站通过SystemInformationBlockType2的timeAlignmentTimerCommon字段来配置小区特定级别的timer；通过MAC-MainConfig的timeAlignmentTimerDedicated字段来配置UE特定级别的timer。如果UE配置了UE特定级别的timer，则UE使用该timer值，否则UE使用小区特定级别的timer值。
一般情况下，当UE收到TAC(来自RAR或Timing Advance Command MAC CE)，UE会启动或重启该timer。如果该timer超时，则认为上行失步，UE会清空混合自动重传请求(Hybrid Automatic Repeat reQuest，HARQ)缓存(buffer)，通知RRC层释放物理上行控制信道(Physical Uplink Control Channel，PUCCH)或SRS，并清空任何配置的下行分配(DL assignment)和上行授权(UL grant)。当该timer在运行时，UE认为上行是同步的；而当该timer没有运行，即上行失步时，UE在上行只能发送preamble。
在上行失步时，UE只能发起随机接入过程。目前LTE系统中，按照协议规定，UE要与基站通信，首先要接入该基站，也就是发起随机接入过程。如图3所示，基于竞争的随机接入过程一般采用如下四个步骤。
在步骤301中，UE通过系统信息或者RRC信令获知用于随机接入的可用的前导序列以及发送前导序列的时频位置，然后，在可用的资源内，随机选择前导序列和发送前导序列的时频位置，并发送前导序列给基站。
在步骤302中，基站通过随机接入前导序列采用的时频位置，推断UE可能采用的随机接入无线网络临时标识(Random Access-Radio Network Temporary Identity，RA-RNTI)，并用RA-RNTI解码前导序列，当基站成功解码出前导序列后，给UE回复随机接入响应，其中，随机接入响应中携带上行授权等信息。
在步骤303中，UE在上行授权的资源上发送上行数据，并携带UE的标识 等信息。
在步骤304中，基站在上行授权的资源上解析上行数据，确认UE，解决冲突，并发送竞争决议标识给UE。
由此可知，UE接入网络需要花费较长的时间，因此，随着业务对低时延要求的需求浮现，随机接入过程的简化也受到人们的逐渐关注，尤其是非正交多址技术获得各个公司的认可，随机接入过程的简化在标准讨论中提上日程，目前讨论的方向是简化为两步随机接入过程。UE可在非授权的情况下(Grant free)，将数据发送给基站。如图4所示，包含以下两个步骤。
在步骤401中，UE在非授权的资源池内，选择资源，发送上行数据。
在步骤402中，基站解析出上行数据后，回复响应或者数据。
目前LTE系统关于信令开销降低有多个技术，比如，第14版(Release 14，R14)正在标准化过程中的轻连接技术(Lighted Connected UE)以及5G的非激活态(inactive state)研究等。当UE没有数据传输的情况下，UE和网络设备间可保持“较轻”的连接状态或者非激活态。比如，关于非激活态的技术研究中，UE与网络设备之间断开连接，而始终保持UE的S1连接，当处于非激活态的UE有数据需要发送时，需重新建立UE和网络设备间的连接。此外，在第三代合作伙伴计划(Third Generation Partnership Project，3GPP)标准化进程过程中，一种基于无线接入网络(Radio Access Network，RAN)的寻呼机制被广泛地进行了讨论并获得了广泛的同意，即基站侧直接发送寻呼消息给UE。如果前面提到的两步随机接入过程用于非激活态的UE也是比较合适的(非激活态终端可能只有很小的一个数据包发送，可以节约大量的信令消耗)。
在两步随机接入过程中，UE可以直接发送上行数据，为了保证数据解析正确，因此UE必须有准确的TA值。而目前LTE系统中，TA值的更新只是针对连接态的终端，对于终端处于非激活态或者空闲态时TA相关的问题尚未解决，比如，处于非激活态或者空闲态的终端如何保持TAT运行，如何保持处于非激活态或者空闲态的终端的上行同步等。
发明内容
本实施例提供一种定时提前(TA)维护方法、装置及系统，能够维护处于非激活态或者空闲态的终端的上行定时提前，从而节约大量的信令和开销。
一种TA维护方法，包括：
终端接收网络侧发送的TA指示信息；
所述终端根据所述TA指示信息，确定在非激活态或者空闲态时采用的TA值；
其中，所述非激活态指所述终端与网络侧的第一网络设备之间的接口断开且所述第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
其中，所述TA指示信息可以用于指示以下至少一项：所述终端处于非激活态或者空闲态时运行的时间对齐定时器(TAT)、所述终端处于非激活态或者空闲态时采用的TA值。
其中，所述TA指示信息所指示的TAT可以包括以下之一：所述终端在连接态时运行的TAT、专用于所述终端的非激活态或者空闲态的TAT。
其中，在所述TA指示信息指示所述终端处于非激活态或者空闲态时运行的TAT时，所述终端根据所述TA指示信息，确定在非激活态或者空闲态时采用的TA值，包括：
所述终端在进入非激活态或者空闲态之后，根据所述TA指示信息，运行所述TA指示信息所指示的TAT，并确定采用所述TAT运行期间维护的TA值。
其中，所述运行所述TA指示信息所指示的TAT时，所述TA维护方法还包括：
所述终端周期性发送上行信息；
接收所述网络侧发送的定时提前命令(TAC)；其中，所述TAC是所述网络侧在收到所述上行信息后发送的；
根据接收到的所述TAC，调整TA值。
其中，所述TAC由所述网络侧通过广播方式或者寻呼方式发送。
其中，所述TA指示信息携带在指示所述终端进入非激活态或者空闲态的信令中，或者，携带在单独信令中。
一种TA维护方法，包括：
网络侧向终端发送TA指示信息，以便所述终端根据所述TA指示信息，确定在非激活态或者空闲态时采用的TA值；
其中，所述非激活态指所述终端与网络侧的第一网络设备之间的接口断开且所述第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
其中，所述TA指示信息可以用于指示以下至少一项：所述终端处于非激活态或者空闲态时运行的TAT、所述终端处于非激活态或者空闲态时采用的TA值。
其中，所述网络侧向终端发送TA指示信息，可以包括以下之一：
所述网络侧在指示所述终端进入非激活态或者空闲态的信令中携带所述TA指示信息；
所述网络侧单独发送所述TA指示信息。
其中，所述TA维护方法还可以包括：
所述网络侧在接收到处于非激活态或者空闲态的终端发送的上行信息之后，发送TAC给所述终端，以调整所述终端采用的TA值。
其中，所述发送TAC给所述终端，可以包括：
通过广播方式或者寻呼方式发送所述TAC。
一种TA维护装置，应用于终端，包括：
第一接收模块，设置为接收网络侧发送的TA指示信息；
第一处理模块，设置为根据所述TA指示信息，确定所述终端在非激活态或者空闲态时采用的TA值；
其中，所述非激活态指所述终端与网络侧的第一网络设备之间的接口断开且所述第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
其中，所述TA指示信息可以用于指示以下至少一项：所述终端处于非激活态或者空闲态时运行的TAT、所述终端处于非激活态或者空闲态时采用的TA值。
其中，所述第一处理模块，设置为在所述TA指示信息指示所述终端处于非激活态或者空闲态时运行的TAT时，通过以下方式根据所述TA指示信息，确定所述终端在非激活态或者空闲态时采用的TA值：
在所述终端进入非激活态或者空闲态之后，根据所述TA指示信息，运行所述TA指示信息所指示的TAT，并确定采用所述TAT运行期间维护的TA值。
其中，所述TA维护装置还包括：
第一发送模块，设置为在所述终端进入非激活态或者空闲态之后，周期性发送上行信息；
第二接收模块，设置为接收所述网络侧发送的TAC；其中，所述TAC是所述网络侧在收到所述上行信息后发送的；
第二处理模块，设置为根据收到的所述TAC，调整TA值。
一种TA维护装置，应用于网络侧，包括：
第二发送模块，设置为向终端发送TA指示信息，以便所述终端根据所述TA指示信息，确定在非激活态或者空闲态时采用的TA值；
其中，所述非激活态指所述终端与网络侧的第一网络设备之间的接口断开且所述第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
其中，所述TA指示信息可以用于指示以下至少一项：所述终端处于非激活态或者空闲态时运行的TAT、所述终端处于非激活态或者空闲态时采用的TA值。
其中，所述TA维护装置还可以包括：
第三接收模块，设置为接收处于非激活态或者空闲态的终端发送的上行信息；
第三发送模块，设置为在所述第三接收模块收到处于非激活态或者空闲态 的终端发送的上行信息之后，发送TAC给所述终端，以调整所述终端采用的TA值。
一种TA维护系统，包括：终端以及网络侧的第一网络设备；
所述网络侧的第一网络设备设置为向所述终端发送TA指示信息；
所述终端设置为根据所述TA指示信息，确定在非激活态或者空闲态时采用的TA值；
其中，所述非激活态指所述终端与网络侧的第一网络设备之间的接口断开且所述第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
其中，所述终端还设置为在非激活态或者空闲态发送上行信息给所述第一网络设备；
所述第一网络设备还设置为根据所述上行信息，发送TAC给所述终端，以调整所述终端采用的TA值。
一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现应用于终端侧的TA维护方法。
一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现应用于网络侧的TA维护方法。
一种终端设备，该终端设备包括一个或多个处理器、存储器以及一个或多个程序，所述一个或多个程序存储在存储器中，当被一个或多个处理器执行时，执行上述TA维护方法。
一种网络设备，该网络设备包括一个或多个处理器、存储器以及一个或多个程序，所述一个或多个程序存储在存储器中，当被一个或多个处理器执行时，执行上述TA维护方法。
一种计算机程序产品，所述计算机程序产品包括存储在非暂态计算机可读存储介质上的计算机程序，所述计算机程序包括程序指令，当所述程序指令被计算机执行时，使所述计算机执行上述任意一种TA维护方法。
在本实施例中，通过网络侧向终端发送TA指示信息，维护终端处于非激活 态或者空闲态时的TA，使得处于非激活态或者空闲态的终端能够获得确定的TA值并且终端可以直接发送上行数据，从而节约大量的信令和开销。
附图说明
图1为LTE网络架构图；
图2为未进行定时提前和进行定时提前的对比示意图；
图3为LTE系统中基于竞争的随机接入过程的示意图；
图4为LTE系统中的非授权随机接入过程的示意图；
图5为本实施例提供的一种定时提前维护方法的流程图；
图6为本实施例中网络侧发送TAC的图样(pattern)时刻的示意图；
图7为本实施例提供的一种定时提前维护装置的示意图一；
图8为本实施例提供的一种定时提前维护装置的示意图二；
图9为本实施例提供的另一种定时提前维护装置的示意图；
图10为本实施例提供的一种终端设备的硬件结构示意图；
图11为本实施例提供的一种网络设备的硬件结构示意图。
具体实施方式
以下结合附图对本实施例进行说明。在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行。并且，虽然在流程图中示出了逻辑顺序，但是在一些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
本实施例提供一种定时提前维护方法，如图5所示，包括以下步骤。
在步骤501中，终端接收网络侧发送的TA指示信息。
在步骤502中，终端根据TA指示信息，确定在非激活态或者空闲态时采用的TA值。
其中，非激活态指终端与网络侧的第一网络设备之间的接口断开且第一网 络设备与网络侧的第二网络设备之间的接口保持连接的状态。比如，在LTE系统中，第一网络设备可以为基站，第二网络设备可以为核心网，终端与第一网络设备之间的接口为Uu口，第一网络设备与第二网络设备之间的接口为S1口，即终端处于非激活态时，终端的Uu口断开且S1口保持连接。
其中，TA指示信息可以携带在指示终端进入非激活态或者空闲态的信令中，或者，携带在单独信令中，比如，网络侧单独发送一条携带TA指示信息的RRC消息给终端。
其中，TA指示信息可以用于指示以下至少一项：终端处于非激活态或者空闲态时运行的TAT、终端处于非激活态或者空闲态时采用的TA值。
其中，TA指示信息所指示的TAT可以包括以下之一：终端在连接态时运行的TAT、专用于终端的非激活态或者空闲态的TAT。
其中，TA指示信息所指示的TA值可以为0，比如，小区本身非常小时。
其中，在TA指示信息指示终端处于非激活态或者空闲态时运行的TAT时，步骤502可以包括以下内容。
终端在进入非激活态或者空闲态之后，根据TA指示信息，运行TA指示信息所指示的TAT，并确定采用该TAT运行期间维护的TA值。
其中，当TA指示信息所指示的TAT为终端在连接态时运行的TAT时，终端可以在非激活态或者空闲态采用连接态的TA值，并继续保持连接态的TAT的运行；当TA指示信息所指示的TAT为专门针对非激活态或者空闲态定义的TAT时，终端可以在非激活态或者空闲态启动专门定义的TAT，此时，终端采用的TA值可以是预先配置的，或者，是由基站通过广播方式或者寻呼方式发送的。
其中，在TAT保持运行期间，终端可以确定TAT运行期间维护的TA值，并根据该TA值直接发送上行数据。终端可以仅保持TAT的运行，不进行TA值的更新，这种情况的优点是终端和网络侧之间不用频繁地交互TA相关信息，信令负荷低；缺点是一旦TAT超时，终端便失去了有效的TA值。
在示例性实施方式中，本实施例的TA维护方法还可以包括以下内容。
处于非激活态或者空闲态的终端周期性发送上行信息。
接收网络侧发送的TAC；其中，TAC是网络侧在收到上行信息后发送的。
根据收到的TAC，调整TA值。
在本实施方式中，可以对处于非激活态或者空闲态的终端进行TA值更新。
其中，TAC可以由网络侧通过广播方式或者寻呼方式发送。
此外，本实施例还提供一种TA维护方法，包括以下内容。
网络侧向终端发送TA指示信息，以便终端根据TA指示信息，确定在非激活态或者空闲态时采用的TA值。
其中，非激活态指终端与网络侧的第一网络设备之间的接口断开且第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。比如，在LTE系统中，第一网络设备可以为基站，第二网络设备可以为核心网，终端与第一网络设备之间的接口为Uu口，第一网络设备与第二网络设备之间的接口为S1口，即终端处于非激活态时，终端的Uu口断开且S1口保持连接。
其中，TA指示信息可以用于指示以下至少一项：终端处于非激活态或者空闲态时运行的TAT、终端处于非激活态或者空闲态时采用的TA值(比如，TA值为0)。
其中，TA指示信息所指示的TAT可以包括以下之一：终端在连接态时运行的TAT、专用于终端的非激活态或者空闲态的TAT。
其中，网络侧向终端发送TA指示信息，可以包括以下之一。
网络侧在指示终端进入非激活态或者空闲态的信令中携带TA指示信息。以及，网络侧单独发送TA指示信息，比如，单独发送一条携带TA指示信息的RRC消息。
在示例性实施方式中，本实施例的TA维护方法还可以包括以下内容。
网络侧在接收到处于非激活态或者空闲态的终端发送的上行信息之后，发送TAC给终端，以调整终端采用的TA值。
其中，处于非激活态或者空闲态的终端可以周期性触发传输上行信息(比如，数据信息、测量信息、控制信息等等任何上行信息)，网络侧收到上行信息后会对TA值进行调整，并通过TAC发送给终端，终端收到TAC后会对TA值进行调整。
其中，网络侧可以通过广播方式或者寻呼方式发送TAC。
下面通过多个实施方式对本公开进行举例说明。
本实施例中，网络侧发送的TA指示信息随RRC连接挂起命令一起发送给UE；UE处于非激活态时，采用的TA值为连接态的TA值，且TA值不进行更新。
本实施例包括以下步骤。
在步骤11中，UE处于连接态时，网络侧发送RRC连接挂起(suspend)命令指示UE进入非激活态，同时，在该命令中增加保持连接态的TAT运行的指示信息(即“keep Connected TAT running indication”)，用于指示UE在非激活态时采用连接态的TA值并继续保持连接态的TAT运行。
在步骤12中，UE收到上述RRC连接挂起命令后，进入非激活态，并继续保持连接态的TAT运行。
在步骤13中，在UE有上行数据发送且TAT还没有超时的情况下，UE在已配置的资源内直接发送上行数据给网络侧。
本实施例中，网络侧单独发送TA指示信息给UE；UE处于非激活态时，采用的TA值为连接态的TA值，且TA值不进行更新。
本实施例包括以下步骤。
在步骤21中，UE处于连接态时，网络侧发送RRC连接挂起(suspend)命令指示UE进入非激活态，而且，网络侧单独发送一条RRC消息(即“keep Connected TAT running indication”)，用于指示UE在进入非激活态之后采用连接态的TA值并继续保持连接态的TAT运行。
在步骤22中，UE收到上述RRC连接挂起命令后，进入非激活态，在收到 RRC消息后，继续保持连接态的TAT运行；
在步骤23中，在UE有上行数据发送且TAT还没有超时的情况下，UE在已配置的资源内直接发送上行数据给网络侧。
本实施例中，网络侧发送的TA指示信息随RRC连接挂起命令一起发送给UE；UE处于非激活态时，TA值为0，且TA值不进行更新。
本实施例包括以下步骤。
在步骤31中，UE处于连接态时，网络侧发送RRC连接挂起(suspend)命令指示UE进入非激活态，同时，在该命令中增加终端不进行定时提前的指示(“no TA indication”or“small cell indication”)，用于指示UE在非激活态时采用的TA值为0。
在步骤32中，UE收到上述RRC连接挂起命令后，进入非激活态，并保存该TA值。
在步骤33中，当UE有上行数据发送时，UE在已配置的资源内直接发送上行数据给网络侧。
本实施例中，网络侧发送的TA指示信息随RRC连接挂起命令一起发送给UE；UE处于非激活态时，采用的TA值为连接态的TA值，且TA值进行更新；TA值更新过程中的TAC采用寻呼方式发送。
本实施例包括以下步骤。
在步骤41中，UE处于连接态时，网络侧发送RRC连接挂起(suspend)命令指示UE进入非激活态，同时，在该命令中增加保持连接态的TAT运行的指示信息(“keep Connected TAT running indication”)，用于指示UE在非激活态时采用连接态的TA值并继续保持连接态的TAT运行。
在步骤42中，UE收到上述RRC连接挂起命令后，进入非激活态，并继续保持连接态的TAT运行。
其中，在TAT超时之前，UE需要对TAC进行监测。
在步骤43中，UE以周期T1发送上行信息(可以为任意上行传输信息)。
步骤44：网络侧收到UE的上行信息后，对UE的TA值进行调整，并在预先配置的“寻呼”时刻发送TAC给UE。
其中，TAC的发送时刻可以预先配置，以固定的图案(pattern)时刻在TAT超时(网络侧也会维护与UE侧的TAT类似的定时器)之前发送，如图6所示。
其中，TAC携带的值可以是绝对值或者相对值(即相对UE侧维护的TA值的一个调整量)。
在步骤45中，UE在预定义的多个时刻监测TAC，当收到网络侧的TAC后，根据收到的TAC对TA值进行调整。
其中，如果UE收到的是关于TA值的绝对值，则UE直接用新的TA值(即TAC携带的值)替换旧的TA值；如果UE收到的是关于TA值的相对值(即TA值的一个调整量)，则UE可以根据该调整量采用一定算法进行调整，比如直接叠加，或者进行滤波方式；举例而言，TA_new＝TA_old+(31-TA)×16，其中，TA为TAC中携带的值。
本实施例中，网络侧发送的TA指示信息随RRC连接释放命令一起发送给UE；UE处于空闲态时，采用的TA值为连接态的TA值，且TA值不进行更新。
本实施例包括以下步骤。
在步骤51中，UE处于连接态时，网络侧发送RRC连接释放命令指示UE进入空闲态，同时，在该命令中增加保持连接态的TAT运行的指示信息(“keep Connected TAT running indication”)，用于指示UE在空闲态时采用连接态的TA值并继续保持连接态时的TAT运行。
在步骤52中，UE收到上述RRC连接释放命令后，进入空闲态，并继续保持连接态的TAT运行。
在步骤53中，在UE有上行数据发送且TAT还没有超时的情况下，UE在已配置的资源内直接发送上行数据给网络侧。
UE处于空闲态时的其他处理方式与非激活态时的处理方式类似。
此外，本实施例提供一种TA维护装置，应用于终端，如图7所示，包括以 下模块。
第一接收模块701，设置为接收网络侧发送的TA指示信息。
第一处理模块702，设置为根据TA指示信息，确定终端在非激活态或者空闲态时采用的TA值。
其中，非激活态指终端与网络侧的第一网络设备之间的接口断开且第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。比如，在LTE系统中，第一网络设备可以为基站，第二网络设备可以为核心网，终端与第一网络设备之间的接口为Uu口，第一网络设备与第二网络设备之间的接口为S1口，即终端处于非激活态时，终端的Uu口断开且S1口保持连接。
其中，TA指示信息可以携带在指示终端进入非激活态或者空闲态的信令中，或者，携带在单独信令中，比如，网络侧单独发送一条携带TA指示信息的RRC消息给终端。
其中，TA指示信息可以用于指示以下至少一项：终端处于非激活态或者空闲态时运行的TAT、终端处于非激活态或者空闲态时采用的TA值(比如，TA值为0)。
其中，TA指示信息所指示的TAT可以包括以下之一：终端在连接态时运行的TAT、专用于终端的非激活态或者空闲态的TAT。
其中，第一处理模块702，设置为在TA指示信息指示终端处于非激活态或者空闲态时运行的TAT时，通过以下方式根据TA指示信息，确定终端在非激活态或者空闲态时采用的TA值：在终端进入非激活态或者空闲态之后，根据TA指示信息，运行TA指示信息所指示的TAT，并确定采用TAT运行期间维护的TA值。
在示例性实施方式中，如图8所示，本实施例提供的TA维护装置还可以包括以下模块。
第一发送模块703，设置为在终端进入非激活态或者空闲态之后，周期性发送上行信息。
第二接收模块704，设置为接收网络侧发送的TAC；其中，TAC是网络侧在收到上行信息后发送的。
第二处理模块705，设置为根据收到的TAC，调整TA值。
其中，TAC可以由网络侧通过广播方式或者寻呼方式发送。
另外，关于本实施例提供的TA维护装置的相关过程可以参照上述方法实施例的描述。
本实施例还提供一种TA维护装置，应用于网络侧，如图9所示，包括第二发送模块901，设置为向终端发送TA指示信息，以便终端根据TA指示信息，确定在非激活态或者空闲态时采用的TA值。
其中，非激活态指终端与网络侧的第一网络设备之间的接口断开且第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。比如，在LTE系统中，第一网络设备可以为基站，第二网络设备可以为核心网，终端与第一网络设备之间的接口为Uu口，第一网络设备与第二网络设备之间的接口为S1口，即终端处于非激活态时，终端的Uu口断开且S1口保持连接。
其中，TA指示信息可以用于指示以下至少一项：终端处于非激活态或者空闲态时运行的TAT、终端处于非激活态或者空闲态时采用的TA值(比如，TA值为0)。
其中，TA指示信息所指示的TAT可以包括以下之一：终端在连接态时运行的TAT、专用于终端的非激活态或者空闲态的TAT。
其中，第二发送模块901可以用于通过以下方式之一向终端发送TA指示信息：在指示终端进入非激活态或者空闲态的信令中携带TA指示信息；单独发送TA指示信息。
在示例性实施方式中，本实施例的TA维护装置还可以包括以下模块。
第三接收模块902，设置为接收处于非激活态或者空闲态的终端发送的上行信息。
第三发送模块903，设置为在第三接收模块902收到处于非激活态或者空闲 态的终端发送的上行信息之后，发送TAC给终端，以调整终端采用的TA值。
另外，关于本实施例提供的TA维护装置的相关过程可以参照上述方法实施例的描述。
本实施例还提供一种TA维护装置，应用于终端，包括处理器以及存储有处理器可执行指令的存储器，当指令被处理器执行时，执行如下操作。
接收网络侧发送的TA指示信息。
根据TA指示信息，确定终端在非激活态或者空闲态时采用的TA值；
其中，非激活态指终端与网络侧的第一网络设备之间的接口断开且第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
其中，TA指示信息可以用于指示以下至少一项：终端处于非激活态或者空闲态时运行的TAT、终端处于非激活态或者空闲态时采用的TA值。
另外，关于本实施例提供的TA维护装置的相关描述可以参照上述方法实施例。
本实施例还提供一种TA维护装置，应用于网络侧，包括处理器以及存储有处理器可执行指令的存储器，当指令被处理器执行时，执行如下操作。
向终端发送TA指示信息，以便终端根据TA指示信息，确定在非激活态或者空闲态时采用的TA值。
其中，非激活态指终端与网络侧的第一网络设备之间的接口断开且第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
其中，TA指示信息可以用于指示以下至少一项：终端处于非激活态或者空闲态时运行的TAT、终端处于非激活态或者空闲态时采用的TA值。
另外，关于本实施例提供的TA维护装置的相关描述可以参照上述方法实施例。
本实施例还提供一种TA维护系统，包括：终端以及网络侧的第一网络设备；其中，第一网络设备用于向终端发送TA指示信息；终端用于根据TA指示信息，确定在非激活态或者空闲态时采用的TA值。
其中，非激活态指终端与第一网络设备之间的接口断开且第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。比如，在LTE系统中，第一网络设备可以为基站，第二网络设备可以为核心网，终端与第一网络设备之间的接口为Uu口，第一网络设备与第二网络设备之间的接口为S1口，即终端处于非激活态时，终端的Uu口断开且S1口保持连接。
其中，终端还可以用于在非激活态或者空闲态发送上行信息给第一网络设备；第一网络设备还用于根据收到的上行信息，发送TAC给终端，以调整终端采用的TA值。
其中，终端可以参照如图7或图8所示实施例的描述，第一网络设备可以参照如图9所示实施例的描述。
此外，本实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现应用于终端侧的定时提前维护方法。
此外，本实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现应用于网络侧的定时提前维护方法。
图10为本实施例提供的一种终端设备的硬件结构示意图，如图10所示，该终端设备包括：一个或多个处理器101和存储器102。图10中以一个处理器101为例。
所述终端设备还可以包括：输入装置103和输出装置104。
所述终端设备中的处理器101、存储器102、输入装置103和输出装置104可以通过总线或者其他方式连接，图10中以通过总线连接为例。
输入装置103可以接收输入的数字或字符信息，输出装置104可以包括显示屏等显示设备。
如图11所示，为本实施例提供的一种网络设备的硬件结构示意图，如图11所示，该网络设备包括：处理器111和存储器112；还可以包括通信接口113和 总线114。
其中，处理器111、存储器112和通信接口113可以通过总线114完成相互间的通信。通信接口113可以用于信息传输。处理器111可以调用存储器112中的逻辑指令，以执行上述实施例的任意一种方法。
存储器102和存储器112可以包括存储程序区和存储数据区，存储程序区可以存储操作系统和至少一个功能所需的应用程序。存储数据区可以存储根据电子设备的使用所创建的数据等。此外，存储器可以包括，例如，随机存取存储器的易失性存储器，还可以包括非易失性存储器。例如至少一个磁盘存储器件、闪存器件或者其他非暂态固态存储器件。
此外，在上述存储器102和存储器112中的逻辑指令可以通过软件功能单元的形式实现并作为独立的产品销售或使用时，该逻辑指令可以存储在一个计算机可读取存储介质中。本公开的技术方案可以以计算机软件产品的形式体现出来，该计算机软件产品可以存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本实施例所述方法的全部或部分步骤。
存储介质可以是非暂态存储介质，也可以是暂态存储介质。非暂态存储介质可以包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等多种可以存储程序代码的介质。
实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指示相关的硬件完成的，该程序可存储于一个非暂态计算机可读存储介质中，该程序被执行时，可包括如上述方法的实施例的流程。
上述方法中的全部或部分步骤可通过程序来指令相关硬件(例如处理器)完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的多个模块或者单元可以采用硬件的形式实现， 例如通过集成电路来实现其相应功能，也可以采用软件功能模块的形式实现，例如通过处理器执行存储于存储器中的程序/指令来实现其相应功能。
工业实用性
本公开提供的定时提前TA维护方法和装置，通过网络侧向终端发送TA指示信息，维护终端处于非激活态或者空闲态时的TA，使得处于非激活态或者空闲态的终端能够获得确定的TA值并且终端可以直接发送上行数据，从而节约大量的信令和开销。

Claims (22)

  1. 一种定时提前TA维护方法，包括：
    终端接收网络侧发送的TA指示信息；
    所述终端根据所述TA指示信息，确定在非激活态或者空闲态时采用的TA值；
    其中，所述非激活态指所述终端与网络侧的第一网络设备之间的接口断开且所述第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
  2. 根据权利要求1所述的方法，其中，所述TA指示信息用于指示以下至少一项：所述终端处于非激活态或者空闲态时运行的时间对齐定时器TAT、所述终端处于非激活态或者空闲态时采用的TA值。
  3. 根据权利要求2所述的方法，其中，所述TA指示信息所指示的TAT包括以下之一：所述终端在连接态时运行的TAT、专用于所述终端的非激活态或者空闲态的TAT。
  4. 根据权利要求2所述的方法，其中，在所述TA指示信息指示所述终端处于非激活态或者空闲态时运行的TAT时，
    所述终端根据所述TA指示信息，确定在非激活态或者空闲态时采用的TA值，包括：
    所述终端在进入非激活态或者空闲态之后，根据所述TA指示信息，运行所述TA指示信息所指示的TAT，并确定采用所述TAT运行期间维护的TA值。
  5. 根据权利要求4所述的方法，其中，在运行所述TA指示信息所指示的TAT时，所述方法还包括：
    所述终端周期性发送上行信息；
    接收所述网络侧发送的定时提前命令TAC；其中，所述TAC是所述网络侧在收到所述上行信息后发送的；
    根据接收到的所述TAC，调整TA值。
  6. 根据权利要求5所述的方法，其中，所述TAC由所述网络侧通过广播方式或者寻呼方式发送。
  7. 根据权利要求1所述的方法，其中，所述TA指示信息携带在指示所述终端进入非激活态或者空闲态的信令中，或者，携带在单独信令中。
  8. 一种定时提前TA维护方法，包括：
    网络侧向终端发送TA指示信息，以便所述终端根据所述TA指示信息，确定在非激活态或者空闲态时采用的TA值；
    其中，所述非激活态指所述终端与网络侧的第一网络设备之间的接口断开且所述第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
  9. 根据权利要求8所述的方法，其中，所述TA指示信息用于指示以下至少一项：所述终端处于非激活态或者空闲态时运行的时间对齐定时器TAT、所述终端处于非激活态或者空闲态时采用的TA值。
  10. 根据权利要求8所述的方法，其中，所述网络侧向终端发送TA指示信息，包括以下之一：
    所述网络侧在指示所述终端进入非激活态或者空闲态的信令中携带所述TA指示信息；
    所述网络侧单独发送所述TA指示信息。
  11. 根据权利要求8所述的方法，还包括：
    所述网络侧在接收到处于非激活态或者空闲态的终端发送的上行信息之后，发送定时提前命令TAC给所述终端，以调整所述终端采用的TA值。
  12. 根据权利要求11所述的方法，其中，所述发送TAC给所述终端，包括：
    通过广播方式或者寻呼方式发送所述TAC。
  13. 一种定时提前TA维护装置，应用于终端，包括：
    第一接收模块，设置为接收网络侧发送的TA指示信息；
    第一处理模块，设置为根据所述TA指示信息，确定所述终端在非激活态或者空闲态时采用的TA值；
    其中，所述非激活态指所述终端与网络侧的第一网络设备之间的接口断开 且所述第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
  14. 根据权利要求13所述的装置，其中，所述TA指示信息用于指示以下至少一项：所述终端处于非激活态或者空闲态时运行的时间对齐定时器TAT、所述终端处于非激活态或者空闲态时采用的TA值。
  15. 根据权利要求13所述的装置，其中，所述第一处理模块，设置为在所述TA指示信息指示所述终端处于非激活态或者空闲态时运行的TAT时，通过以下方式根据所述TA指示信息，确定所述终端在非激活态或者空闲态时采用的TA值：
    在所述终端进入非激活态或者空闲态之后，根据所述TA指示信息，运行所述TA指示信息所指示的TAT，并确定采用所述TAT运行期间维护的TA值。
  16. 根据权利要求15所述的装置，还包括：
    第一发送模块，设置为在所述终端进入非激活态或者空闲态之后，周期性发送上行信息；
    第二接收模块，设置为接收所述网络侧发送的定时提前命令TAC；其中，所述TAC是所述网络侧在收到所述上行信息后发送的；
    第二处理模块，设置为根据收到的所述TAC，调整TA值。
  17. 一种定时提前TA维护装置，应用于网络侧，包括：
    第二发送模块，设置为向终端发送TA指示信息，以便所述终端根据所述TA指示信息，确定在非激活态或者空闲态时采用的TA值；
    其中，所述非激活态指所述终端与网络侧的第一网络设备之间的接口断开且所述第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
  18. 根据权利要求17所述的装置，其中，所述TA指示信息用于指示以下至少一项：所述终端处于非激活态或者空闲态时运行的时间对齐定时器TAT、所述终端处于非激活态或者空闲态时采用的TA值。
  19. 根据权利要求17所述的装置，还包括：
    第三接收模块，设置为接收处于非激活态或者空闲态的终端发送的上行信 息；
    第三发送模块，设置为在所述第三接收模块收到处于非激活态或者空闲态的终端发送的上行信息之后，发送定时提前命令TAC给所述终端，以调整所述终端采用的TA值。
  20. 一种定时提前TA维护系统，包括：终端以及网络侧的第一网络设备；
    所述网络侧的第一网络设备设置为向所述终端发送TA指示信息；
    所述终端设置为根据所述TA指示信息，确定在非激活态或者空闲态时采用的TA值；
    其中，所述非激活态指所述终端与网络侧的第一网络设备之间的接口断开且所述第一网络设备与网络侧的第二网络设备之间的接口保持连接的状态。
  21. 根据权利要求20所述的TA维护系统，其中，所述终端还设置为在非激活态或者空闲态发送上行信息给所述第一网络设备；
    所述第一网络设备还设置为根据所述上行信息，发送定时提前命令TAC给所述终端，以调整所述终端采用的TA值。
  22. 一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求1-12任一项的方法。
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