CN110896560B - Uplink signal sending method and terminal - Google Patents
Uplink signal sending method and terminal Download PDFInfo
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- CN110896560B CN110896560B CN201811068668.4A CN201811068668A CN110896560B CN 110896560 B CN110896560 B CN 110896560B CN 201811068668 A CN201811068668 A CN 201811068668A CN 110896560 B CN110896560 B CN 110896560B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The embodiment of the invention provides an uplink signal sending method and a terminal, wherein the method comprises the following steps: calculating TA according to the parameters of the downlink signals; and sending an uplink signal according to the TA. The embodiment of the invention can reduce the uplink signal interference.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an uplink signal sending method and a terminal.
Background
In order to avoid uplink interference in a communication system, a network side configures an uplink Timing Advance (TA) value for uplink transmission of a terminal, and after receiving the TA, if the terminal needs to transmit an uplink signal, the terminal performs uplink signal transmission by advancing time corresponding to the TA with reference to a downlink subframe position. At present, a TA value is mainly configured to a terminal by a network side, but in practical application, there may be a TA which is not configured by the terminal to the network side, and in this case, the terminal uses a fixed or default TA to transmit an uplink signal at present, and the value of the fixed or default TA is 0, so that it cannot be ensured that uplink signals of different terminals arrive at a fixed time, which may cause serious uplink signal interference.
Disclosure of Invention
The embodiment of the invention provides an uplink signal sending method and a terminal, which aim to solve the problem of serious uplink signal interference under the condition that the terminal does not acquire a TA configured by a network side.
In a first aspect, an embodiment of the present invention provides an uplink signal sending method, applied to a terminal, including:
calculating TA according to the parameters of the downlink signals;
and sending an uplink signal according to the TA.
In a second aspect, an embodiment of the present invention provides a terminal, including:
the calculation module is used for calculating TA according to the parameters of the downlink signals;
and the sending module is used for sending the uplink signal according to the TA.
In a third aspect, an embodiment of the present invention provides a terminal, including: the uplink signal transmission method comprises a memory, a processor and a program which is stored on the memory and can be run on the processor, wherein the program realizes the steps in the uplink signal transmission method provided by the embodiment of the invention when being executed by the processor.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the uplink signal transmitting method provided in the embodiment of the present invention are implemented.
In the embodiment of the invention, TA is calculated according to the parameters of the downlink signals; the uplink signal is sent according to the TA, and the TA is calculated according to the parameters of the downlink signal, so that different terminals send the uplink signal according to the TA under the condition that the terminal does not acquire the TA configured on the network side, the uplink signals of different terminals can be ensured to arrive at fixed time, and the uplink signal interference can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a block diagram of a network system to which an embodiment of the present invention is applicable;
fig. 2 is a flowchart of an uplink signal transmitting method according to an embodiment of the present invention;
fig. 3 is a flowchart of another uplink signal transmission method according to an embodiment of the present invention;
fig. 4 is a structural diagram of a terminal according to an embodiment of the present invention;
fig. 5 is a structural diagram of another terminal according to an embodiment of the present invention;
fig. 6 is a block diagram of another terminal provided in an embodiment of the present invention;
fig. 7 is a block diagram of another terminal according to an embodiment of the present invention;
fig. 8 is a structural diagram of another terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises," "comprising," or any other variation thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the use of "and/or" in the specification and claims means that at least one of the connected objects, such as a and/or B, means that three cases, a alone, B alone, and both a and B, exist.
In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
Embodiments of the present invention are described below with reference to the accompanying drawings. The uplink signal sending method and the terminal provided by the embodiment of the invention can be applied to a wireless communication system. The wireless communication system may be a 5G system, an Evolved Long Term Evolution (lte) system, or a subsequent lte communication system.
Referring to fig. 1, fig. 1 is a structural diagram of a network system to which an embodiment of the present invention is applicable, and as shown in fig. 1, the network system includes a terminal 11 and a base station 12, where the terminal 11 may be a User Equipment (UE) or other terminal-side devices, for example: it should be noted that, in the embodiment of the present invention, a specific type of the terminal 11 is not limited, and the terminal may be a terminal-side Device such as a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), or a Wearable Device (Wearable Device). The base station 12 may be a 4G base station, or a 5G base station, or a later-version base station, or a base station in other communication systems, or referred to as a node B, an evolved node B, or other words in the field, and the base station is not limited to a specific technical word as long as the same technical effect is achieved. The base station 12 may be a Master base station (MN) or a Secondary base Station (SN). It should be noted that, in the embodiment of the present invention, only the 5G base station is taken as an example, but the specific type of the base station is not limited.
Referring to fig. 2, fig. 2 is a flowchart of an uplink signal sending method according to an embodiment of the present invention, where the method is applied to a terminal, and as shown in fig. 2, the method includes the following steps:
The downlink signal may be a downlink signal sent by a network side received by a terminal, and the parameter of the downlink signal may include transmission delay, downlink timing, or downlink path loss. The transmission delay may refer to a time difference between a receiving time of the terminal receiving the downlink signal and a sending time of the network side sending the downlink signal. Of course, the transmission delay is not limited to the calculation of the receiving time of the downlink signal received by the terminal and the transmission time of the downlink signal transmitted by the network side, and may be a conversion relationship between the downlink path loss and the transmission delay.
The calculation of TA according to the parameter of the downlink signal may be performed according to a pre-obtained correspondence relationship between TA and the parameter of the downlink signal, for example: TA is equal to nxx the transmission delay of the downlink signal, where N is a positive real number, such as 1.9, 2, 2.1, or 2.5. Of course, the above-mentioned calculating TA according to the parameter of the downlink signal may also be a parameter obtained from a calculation formula in advance, and the calculation formula is used for calculation, for example: TA (TA)UL(new)＝(TAUL(old)+N×DeltaDLWherein, TAUL(new) is the above TA, TAUL(old) TA used or available before step 201 is performed for the terminal, and DeltaDLCorresponding to the downlink timing of the downlink signal, for example: delta described aboveDLThe amount of change between the current downlink timing and the downlink timing used or available by the terminal before performing step 201.
The correspondence relationship, the calculation formula, or the like may be defined in a protocol, configured to the terminal by the network side, preset by the terminal, or the like, and the correspondence relationship, the calculation formula, or the like is not limited thereto. The above-mentioned method for calculating TA according to the parameters of the downlink signal is not limited to the above-listed method, and for example: the TA may also be calculated using the calculation defined in the protocol.
And step 202, sending an uplink signal according to the TA.
In the above step, since the TA is calculated according to the parameter of the downlink signal, different terminals can calculate the TA according to the parameter of the received downlink signal, so that it can be ensured that uplink signals (for example, from the same subframe) of different terminals arrive at a fixed time, and thus, the uplink signal interference can be reduced.
In the embodiment of the invention, TA is calculated according to parameters of downlink signals; the uplink signal is sent according to the TA, and the TA is calculated according to the parameters of the downlink signal, so that different terminals send the uplink signal according to the TA under the condition that the terminal does not acquire the TA configured on the network side, the uplink signals of different terminals can be ensured to arrive at fixed time, and the uplink signal interference can be reduced.
Referring to fig. 3, fig. 3 is a flowchart of another uplink signal transmission method according to an embodiment of the present invention, where the method is applied to a terminal, and as shown in fig. 3, the method includes the following steps:
The trigger event may be a predefined event for indicating that the terminal needs to calculate its TA, for example: the network side specifies or agrees on the triggering event.
Since the TA is calculated only when the trigger event occurs in step 301, it can be avoided that the terminal randomly or repeatedly calculates the TA, so that the TA used when the terminal sends the uplink signal is unclear by the network side, thereby avoiding that the network side may not successfully receive the uplink signal sent by the terminal, so as to improve the communication performance of the communication system.
As an optional implementation, the trigger event includes:
triggering specific uplink signal transmission; or alternatively
Cell switching; or
Primary and Secondary cells (PSCell) are added or changed.
The specific uplink signal may be indicated by the network side or agreed by a protocol, for example: a Physical Uplink Shared Channel (PUSCH) Signal, a Physical Uplink Control Channel (PUCCH) Signal, a Sounding Reference Signal (SRS), or the like.
Therefore, when the specific uplink signal is triggered to be transmitted, the TA is calculated, so that the specific uplink signal can be transmitted according to the TA to reduce the interference of the specific uplink signal.
Further, the triggering the specific uplink signal transmission may include:
triggering the specific uplink signal to be sent in a non-connection state; or
Under the condition that TA indicated by the network side is not acquired, triggering the specific uplink signal to be sent; or
And triggering the specific uplink signal to be sent under the condition that a timer corresponding to the uplink timing is overtime.
The unconnected state may be an IDLE state (IDLE) or an INACTIVE state (INACTIVE), so that the TA may be calculated when the unconnected state (IDLE or INACTIVE state) triggers a specific uplink signal transmission, thereby reducing interference of uplink signal transmission in the unconnected state (IDLE or INACTIVE state).
The triggering of the specific uplink signal transmission when the TA instructed by the network side is not acquired may be to calculate the TA when the specific uplink signal transmission is triggered when the TA instructed by the network side is not acquired, so as to reduce uplink signal interference when the TA instructed by the network side is acquired.
The Timer corresponding to the uplink timing may be an uplink synchronization Timer (TAT), or the Timer corresponding to the uplink timing may be a Timer corresponding to the TA. Therefore, the TA can be calculated when the specific uplink signal is triggered to be sent under the condition that the timer is overtime, so that the downlink signal interference is reduced.
In addition, the triggering event may be cell switching, so that the TA may be calculated in the cell switching process, and thus, when a signal is transmitted in or after the cell switching process, the signal may be transmitted according to the TA, thereby reducing interference of an uplink signal in or after the cell switching process.
The trigger event may be addition or change of a PSCell, so that the TA may be calculated during the addition or change of the PSCell, and thus, when a signal is transmitted during or after the addition or change of the PSCell, the signal may be transmitted according to the TA, thereby reducing interference of an uplink signal during or after the addition or change of the PSCell.
As an optional implementation manner, if a trigger event for instructing the terminal to calculate the TA occurs, calculating the TA according to a parameter of a downlink signal includes:
and if a trigger event for indicating the terminal to calculate the TA occurs and the position information of the terminal is matched with the specific position information, calculating the TA according to the parameters of the downlink signal.
The specific location information may be configured by the network side or agreed by a protocol. The position information may be geographical position information, frequency domain position information, time domain position information, or spatial domain position information, and for example: the specific location information includes at least one of:
a specific frequency point identification (e.g., frequency), a specific frequency band identification (e.g., frequency band), a specific cell identification, a specific cell group identification, a specific area location identification, and a specific operator identification.
The specific Cell Identifier may be a Physical Cell Identifier (PCI) or a Cell Global Identifier (CGI).
The specific Cell Group identifier may be a Master Cell Group (MCG) identifier or a Secondary Cell Group (SCG) identifier.
The specific Area location identifier may be a Tracking Area Identity (TAI) identifier, an access network Notification Area (RAN Notification Area, RNA) identifier, or the like.
The specific operator identity may be a Public Land Mobile Network (PLMN) identity.
In this embodiment, since the TA is calculated under the condition that the location information of the terminal is matched with the specific location information, it is avoided that the terminal performs the TA at other locations, and sends the uplink signal according to the TA, so that the network side may not successfully receive the uplink signal sent by the terminal, thereby causing waste of transmission resources and power consumption of the terminal, and achieving the effect of saving the transmission resources and the power consumption of the terminal.
Optionally, before calculating TA according to the parameter of the downlink signal, the method further includes:
and receiving the specific position information issued by the network side.
The specific location information may be sent by the network side through system information or an RRC link release message.
In this embodiment, the specific location information indicated by the terminal on the network side can be used to calculate the TA, so that when the terminal transmits an uplink signal according to the calculated TA, the network side can accurately receive the uplink signal, thereby improving the transmission performance of the uplink signal.
It should be noted that, in this embodiment, step 301 does not limit calculating TA according to the trigger event, for example: the TA may also be calculated directly according to the parameter of the downlink signal when the terminal does not acquire the TA configured on the network side.
As an optional implementation manner, the calculating the uplink timing advance TA according to the parameter of the downlink signal includes:
and calculating the TA according to the transmission delay of the downlink signal.
The calculating the TA according to the transmission delay of the downlink signal may be performed according to a correspondence relationship between the transmission delay of the downlink signal and the TA, which is obtained in advance, for example: TA equals a multiple of the transmission delay of the downlink signal, e.g. TAUL＝N×TDLWherein, TAULIs TA, T, as described aboveDLFor the transmission delay of the downlink signal, N is a real number, for example: 1.9, 2, 2.1 or 2.5, etc. That is, the calculating the TA according to the transmission delay of the downlink signal may include:
and calculating the TA corresponding to the transmission delay of the downlink signal according to the corresponding relation between the TA acquired in advance and the downlink transmission delay.
The calculation is performed by the correspondence relationship, so that the calculation amount can be reduced, for example: by using TAUL＝N×TDLThe corresponding relationship of (a) is calculated.
Alternatively, the calculating the TA according to the transmission delay of the downlink signal may be performed according to a calculation formula of the TA and the transmission delay of the downlink signal acquired in advance, for example: by using TAUL＝N×TDL+ a, wherein, TAULIs TA, T, as described aboveDLFor the transmission delay of the downlink signal, N is a real number, for example: 2. 2.5 or 3, a is a constant or a is related to the current position (geographical position, frequency domain position, spatial domain position).
In this embodiment, the TA is calculated by the transmission delay of the downlink signal, so that the accuracy of the TA can be improved, and the uplink signal interference can be further reduced.
The transmission delay can be obtained by the following method:
and taking the difference between the receiving time of the downlink signal and the sending time of the downlink signal sent by the network side as the transmission delay, wherein the sending time is carried by the system information sent by the network side.
In this embodiment, the transmission delay is calculated directly from the difference between the reception time and the transmission time, which can save the amount of calculation.
As an optional implementation manner, the calculating the uplink timing advance TA according to the parameter of the downlink signal includes:
and calculating the TA according to the downlink path loss of the downlink signal.
The downlink path loss may be calculated by using a protocol convention or a calculation method configured at the network side, for example: pathlossDL＝RSRPreceived－RSRPtransmitted. Wherein PathlossDLFor the above-mentioned downlink path loss, RSRPreceivedFor the strength, RSRP, of the downlink signal received by the terminaltransmittedThe strength of the downlink signal sent by the network side. Of course, in the embodiment of the present invention, the method for calculating the downlink path loss is not limited, and for example: other formulas for calculating the downlink path loss can also be adopted for calculation.
And the calculating the TA according to the downlink path loss of the downlink signal may be calculating the TA corresponding to the transmission delay of the downlink signal according to a correspondence relationship between a TA and a downlink path loss, which is obtained in advance.
In this embodiment, the TA is calculated by the downlink path loss of the downlink signal, which can improve the accuracy of the TA and further reduce the uplink signal interference.
In a preferred embodiment, the calculating the TA according to the downlink path loss of the downlink signal includes:
calculating the downlink path loss of the downlink signal;
calculating the transmission delay of the downlink signal according to the downlink path loss;
and calculating the TA according to the transmission delay of the downlink signal.
It should be noted that, in the embodiment of the present invention, calculating the transmission delay of the downlink signal according to the downlink path loss may be calculated according to a conversion relationship between the downlink path loss and the downlink transmission delay, for example: the calculating the transmission delay of the downlink signal according to the downlink path loss includes:
and converting the downlink path loss of the downlink signal into the transmission delay of the downlink signal according to the conversion relation between the downlink path loss and the downlink transmission delay.
Thus, the conversion is directly carried out according to the conversion relation, so that the calculation complexity can be reduced. For example: the conversion relation may be a downlink path loss (Pathloss)DL1dB) corresponding to transmission delay (T) of downlink signalDL＝10us))。
Further, the above conversion relationship may be obtained by:
predefining the conversion relation; or
Receiving the conversion relation issued by the network side; or
Obtaining historical TA used historically and historical downlink path loss when the historical TA is used, determining historical downlink transmission delay when the historical TA is used according to the historical TA, and taking the relation between the historical downlink path loss and the historical downlink transmission delay as the conversion relation.
The predefined scaling relationship may be predefined by the terminal or predefined in the protocol.
The history TA used in the history may be a TA acquired by the terminal before, and the determining of the history downlink transmission delay using the history TA according to the history TA may be according to the introduction TAAnd calculating the transmission delay with the downlink signal. Thus, the conversion relation between the downlink path loss and the downlink transmission delay can be obtained through the historical downlink path loss and the historical downlink transmission delay. For example: TA (TA)UL(old) ═ 20us, where, TAUL(old) represents the history TA, where the downlink path loss of the terminal is 1 dB. The terminal considers the transmission delay (T) of the downlink signalDL(old)＝TAUL(old)/2 ═ 10us) for downlink path loss (Pathloss)DL(old)＝1dB)。
It should be noted that, in the embodiment of the present invention, the transmission delay of the downlink signal is not limited to be calculated by the downlink path loss of the downlink signal, for example: the downlink signal receiving time may be determined according to the receiving time of the downlink signal received by the terminal and the sending time of the downlink signal sent by the network side.
As an optional implementation manner, the calculating the uplink timing advance TA according to the parameter of the downlink signal includes:
and calculating the TA according to the downlink timing of the downlink signal.
The downlink timing may be calculated, configured on the network side, agreed by a protocol, or the like, which is not limited herein.
The calculating the TA according to the downlink timing of the downlink signal may be performed according to a correspondence between the downlink timing and the TA acquired in advance, or may be performed according to a calculation formula configured by a network side or agreed by a protocol for calculating the TA according to the downlink timing, and preferably, the calculating the TA according to the downlink timing of the downlink signal may include:
acquiring historical TA used by the terminal, and current downlink timing and historical downlink timing, wherein the historical downlink timing is the downlink timing when the terminal uses the historical TA;
calculating a downlink timing variation, wherein the downlink timing variation is a variation between a current downlink timing and a historical downlink timing;
and calculating the TA according to the historical TA and the downlink timing variation.
The historical TA may be a TA recently available to the terminal, and the historical downlink timing is a downlink quantity corresponding to the TA recently available to the terminal. The current downlink timing may be a currently used downlink timing or may be referred to as a new downlink timing, and the downlink timing corresponds to the TA calculated in step 301.
The variation may be a variation obtained by subtracting the historical downlink timing from the current downlink timing, for example: deltaDL＝TDL(new)-TDL(old), wherein, DeltaDLFor the above change amount, TDL(new) is the current downlink timing, TDL(old) is the above history downlink timing.
The calculating the TA according to the historical TA and the downlink timing variation may include:
and taking the sum of the historical TA and a target variable quantity as the TA, wherein the target variable quantity and the downlink timing variable quantity have a specific relation.
For example: TA (TA)UL(new)＝(TAUL(old)+N×DeltaDL) Wherein, TAUL(new) denotes TA calculated above, N being a real number, for example: 1.9, 2, 2.1 or 2.5, etc.
Of course, calculating the TA according to the historical TA and the downlink timing variation is not limited to calculating in the above manner, and for example: or by TAUL(new)＝(TAUL(old)+N×DeltaDL) + a, where a is a constant or a is related to the current position (geographical position, frequency domain position, spatial domain position).
In this embodiment, the TA is calculated from the history TA and the downlink timing variation amount, so that the accuracy of TA calculation can be improved.
And step 302, sending an uplink signal according to the TA.
In this embodiment, through the above steps, the beneficial effects of reducing uplink signal interference, saving transmission resources, improving the accuracy of TA calculation, and the like can be achieved.
In the following, the uplink signal transmission method provided by the embodiment of the present invention is exemplified by using a terminal as a UE:
step 1, a triggering event appointed by a network side or agreed by a protocol indicates that the UE needs to calculate uplink timing for sending uplink signals. Wherein the triggering event for triggering "UE calculates its uplink timing for transmission of uplink signal" includes any one of:
triggering the transmission of a specific uplink signal (such as PUSCH, or PUCCH, or SRS) in an IDLE state or an INACTIVE state;
triggering the transmission of a specific uplink signal (such as PUSCH, or PUCCH, or SRS) under the condition that the uplink timing indicated by the network side is not obtained;
transmitting a specific uplink signal (e.g., PUSCH, PUCCH, or SRS) when a timer (e.g., TAT) corresponding to the uplink timing is expired;
in the process of cell handover;
during the occurrence of PSCell addition or change.
Additionally, the network side may instruct the UE to "trigger" the UE to calculate the location information of its uplink timing for uplink signal transmission "(e.g., through system information or RRC link release message), and the location information may include any combination of one or more of the following:
frequency point identification (e.g., frequency);
band identification (e.g., frequency band);
cell identity (e.g., PCI or CGI, etc.);
cell group identification (e.g., MCG or SCG);
region location markers (e.g., TAI or RNA markers, etc.);
operator identification (e.g., PLMN).
Step 2: and the UE calculates the uplink timing advance for transmitting the uplink signal according to the triggering event in the step 1. The method for calculating the uplink timing advance comprises any one of the following steps:
the method comprises the following steps: the UE calculates the downlink path loss (e.g., Pathloss) of its received signalDL＝RSRPreceived–RSRPtransmitted. Wherein RSRPreceivedFor the intensity, RSRP, of the downlink signal received by the UEtransmittedStrength of downlink signal (RSRP) transmitted for networktransmittedMay be transmitted to the UE through system information). ) The downlink signal transmission delay (e.g., TDL) is derived from the downlink path loss scaling, wherein the scaling method is indicated by protocol conventions or network indications (e.g., downlink path loss (Pathloss)DL1dB) corresponding to downlink signal transmission delay (e.g., T)DL10 us)). Calculating the sending timing advance (such as TA) of the uplink signal according to the transmission delay UE of the downlink signalUL＝2×TDL)
The method 2 comprises the following steps: the UE calculates a conversion relationship between the downlink path loss and the transmission delay of the downlink signal (e.g., the uplink timing advance TA) according to the previously obtained uplink timing advance and the downlink path lossULWhen (old) ═ 20us, the downlink path loss of the UE is 1 dB. The UE considers the downlink signal transmission delay (tdl (old) ═ TA)UL(old)/2 ═ 10us) corresponding to downlink path loss (Pathloss)DL(old) ═ 1 dB)). When the UE initiates the sending of the uplink signal according to the trigger event, according to the conversion relation between the calculated downlink path loss and the transmission delay of the downlink signal, the UE sends the uplink signal according to the current downlink path loss (Pathloss)DL(new)) calculating to obtain downlink signal transmission delay (T)DL(new)), calculating the new sending Timing Advance (TA) of the uplink signal according to the transmission delay time of the downlink signal by the UEUL(new)＝2×TDL(new))。
The method 3 comprises the following steps: the UE records the "most recently available uplink timing advance" (e.g., TA)UL(old)), and a downlink timing (e.g., T) corresponding to the "most recently available uplink timing advanceDL(old)). The UE is calculating a "new uplink timing advance" (e.g., TA)UL(new)), the UE calculates the downlink timing (e.g., T) corresponding to the new uplink timing advanceDL(new)) a change amount (Delta) of downlink timing corresponding to "" the latest available uplink timing advance ""DL＝TDL(new)-TDL(old)), the UE's "new uplink timing advance" is based on "most recentThe available uplink timing advance and the "amount of change in downlink timing" (e.g., TA)UL(new)＝(TAUL(old)+2×DeltaDL))。
Corresponding to method 1 or 2 in step 2, the extra network side may indicate a conversion relationship between the downlink path loss and the transmission delay of the downlink signal (e.g., downlink path loss (Pathloss)DL1dB) corresponding to the transmission delay (T) of downlink signalDL＝10us))。
And step 3: and (3) according to the uplink timing advance calculated in the step (2), the UE sends the uplink signal after advancing the corresponding uplink timing advance when sending the uplink signal according to the downlink timing of the received signal.
This can be achieved: and a triggering event specified by the network side or agreed by the protocol indicates that the UE needs to calculate uplink timing for transmitting the uplink signal. The triggering event includes: transmitting a specific uplink signal (e.g., PUSCH, PUCCH, or SRS) in an IDLE or INACTIVE state; transmitting a specific uplink signal (such as PUSCH, or PUCCH, or SRS) under the condition that the uplink timing indicated by the network side is not obtained; the transmission of a specific uplink signal (e.g., PUSCH, PUCCH, or SRS) is performed when a timer (e.g., TAT) corresponding to the uplink timing is timed out.
And the UE calculates the timing advance of uplink transmission when triggering the transmission of the uplink signal according to the triggering event. Wherein the timing advance is a transmission path delay (T) through a downlink signalDL) Or transmission path loss (Pathloss)DL) And (6) calculating and obtaining.
In the technical scheme, the UE can calculate the sending timing advance of the uplink signal by a specific calculation method under the condition that the effective TA value of the network side is not obtained, and sends the uplink signal by using the sending timing advance, so that the interference caused by the condition that the TA sent by the network side is not obtained when the uplink signal is sent is reduced.
Referring to fig. 4, fig. 4 is a structural diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 4, the terminal 400 includes:
a calculating module 401, configured to calculate an uplink timing advance TA according to a parameter of a downlink signal;
a sending module 402, configured to send an uplink signal according to the TA.
Optionally, the calculating module 401 is configured to calculate the TA according to the parameter of the downlink signal if a trigger event for instructing the terminal to calculate the TA occurs.
Optionally, the triggering event includes:
triggering specific uplink signal transmission; or
Cell switching; or
Adding or changing the primary and secondary cell PSCell.
Optionally, the triggering specific uplink signal transmission includes:
triggering the specific uplink signal to be sent in a non-connection state; or
Under the condition that TA indicated by the network side is not acquired, triggering the specific uplink signal to be sent; or
And triggering the specific uplink signal to be sent under the condition that a timer corresponding to the uplink timing is overtime.
Optionally, the calculating module 401 is configured to calculate the TA according to the parameter of the downlink signal if a trigger event for instructing the terminal to calculate the TA occurs and the location information of the terminal is matched with the specific location information.
Optionally, the specific location information includes at least one of:
specific frequency point identification, specific frequency band identification, specific cell group identification, specific area position identification and specific operator identification.
Optionally, as shown in fig. 5, the terminal 400 further includes:
a first receiving module 403, configured to receive the specific location information sent by the network side.
Optionally, the calculating module 401 is configured to calculate the TA according to a downlink path loss of the downlink signal; or
The calculating module 401 is configured to calculate the TA according to the transmission delay of the downlink signal; or
The calculating module 401 is configured to calculate the TA according to the downlink timing of the downlink signal.
Optionally, the transmission delay is obtained by the following method:
and taking the difference between the receiving time of the downlink signal and the sending time of the downlink signal sent by the network side as the transmission delay, wherein the sending time is carried by the system information sent by the network side.
Optionally, as shown in fig. 6, the calculation module 401 includes:
a first calculating unit 4011, configured to calculate the downlink path loss of the downlink signal;
a second calculating unit 4012, configured to calculate a transmission delay of the downlink signal according to the downlink path loss;
a third calculating unit 4013, configured to calculate the TA according to the transmission delay of the downlink signal.
Optionally, the first calculating unit 4012 is configured to convert the downlink path loss of the downlink signal into the transmission delay of the downlink signal according to a conversion relationship between the downlink path loss and the downlink transmission delay.
Optionally, the conversion relationship is obtained by:
predefining the conversion relation; or
Receiving the conversion relation issued by the network side; or
Obtaining a historical TA used historically, and historical downlink path loss when the historical TA is used, determining historical downlink transmission delay when the historical TA is used according to the historical TA, and taking the relation between the historical downlink path loss and the historical downlink transmission delay as the conversion relation.
Optionally, as shown in fig. 7, the calculation module 401 includes:
an obtaining unit 4014, configured to obtain a history TA used historically, and a current downlink timing and a history downlink timing, where the history downlink timing is a downlink timing when the terminal uses the history TA;
a third calculation unit 4015 configured to calculate a downlink timing variation amount, which is a variation amount between the current downlink timing and the historical downlink timing;
a fourth calculating unit 4016, configured to calculate the TA according to the historical TA and the downlink timing variation.
Optionally, the fourth calculating unit 4016 is configured to use a sum of the history TA and a target variation as the TA, where the target variation has a specific relationship with the downlink timing variation.
The terminal provided by the embodiment of the present invention can implement each process implemented by the terminal in the method embodiment of fig. 2, and for avoiding repetition, details are not described here, and uplink signal interference can be reduced.
Figure 8 is a schematic diagram of the hardware architecture of a terminal implementing various embodiments of the present invention,
the terminal 800 includes but is not limited to: a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, a memory 809, a processor 810, and a power supply 811. Those skilled in the art will appreciate that the terminal configuration shown in fig. 8 is not intended to be limiting, and that the terminal may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.
A processor 810, configured to calculate an uplink timing advance TA according to a parameter of a downlink signal;
a radio frequency unit 801, configured to send an uplink signal according to the TA.
Optionally, the calculating TA according to the parameter of the downlink signal by the processor 810 includes:
and if a trigger event for indicating the terminal to calculate the TA occurs, calculating the TA according to the parameters of the downlink signal.
Optionally, the triggering event includes:
triggering specific uplink signal transmission; or
Cell switching; or
Adding or changing the primary and secondary cell PSCell.
Optionally, the triggering specific uplink signal transmission includes:
triggering the specific uplink signal to be sent in a non-connection state; or
Under the condition that TA indicated by the network side is not acquired, triggering the specific uplink signal to be sent; or
And triggering the specific uplink signal to be sent under the condition that a timer corresponding to the uplink timing is overtime.
Optionally, if the trigger event for instructing the terminal to calculate the TA occurs, the calculating the TA according to the parameter of the downlink signal by the processor 810 includes:
and if a trigger event for indicating the terminal to calculate the TA occurs and the position information of the terminal is matched with the specific position information, calculating the TA according to the parameters of the downlink signal.
Optionally, the specific location information includes at least one of:
specific frequency point identification, specific frequency band identification, specific cell group identification, specific area position identification and specific operator identification.
Optionally, before calculating TA according to the parameter of the downlink signal, the radio frequency unit 801 is further configured to:
and receiving the specific position information issued by the network side.
Optionally, the calculating, by the processor 810, the uplink timing advance TA according to the parameter of the downlink signal includes:
calculating the TA according to the downlink path loss of the downlink signal; or
Calculating the TA according to the transmission delay of the downlink signal; or
And calculating the TA according to the downlink timing of the downlink signal.
Optionally, the transmission delay is obtained by the following method:
and taking the difference between the receiving time of the downlink signal and the sending time of the downlink signal sent by the network side as the transmission delay, wherein the sending time is carried by the system information sent by the network side.
Optionally, the calculating, by the processor 810, the TA according to the downlink path loss of the downlink signal includes:
calculating the downlink path loss of the downlink signal;
calculating the transmission delay of the downlink signal according to the downlink path loss;
and calculating the TA according to the transmission delay of the downlink signal.
Optionally, before the downlink path loss of the downlink signal is converted into the transmission delay of the downlink signal according to the conversion relationship between the downlink path loss and the downlink transmission delay, the radio frequency unit 801 is further configured to:
and receiving the conversion relation issued by the network side.
Optionally, the conversion relationship is obtained by:
predefining the conversion relation; or
Receiving the conversion relation issued by the network side; or
Obtaining historical TA used historically and historical downlink path loss when the historical TA is used, determining historical downlink transmission delay when the historical TA is used according to the historical TA, and taking the relation between the historical downlink path loss and the historical downlink transmission delay as the conversion relation.
Optionally, the calculating, by the processor 810, the TA according to the transmission delay of the downlink signal includes:
and calculating the TA corresponding to the transmission delay of the downlink signal according to the corresponding relation between the TA acquired in advance and the downlink transmission delay.
Optionally, the calculating, by the processor 810, the TA according to the downlink timing of the downlink signal includes:
acquiring historical TA used by the terminal, and current downlink timing and historical downlink timing, wherein the historical downlink timing is the downlink timing when the terminal uses the historical TA;
calculating a downlink timing variation, wherein the downlink timing variation is a variation between a current downlink timing and a historical downlink timing;
and calculating the TA according to the historical TA and the downlink timing variation.
Optionally, the calculating, by the processor 810, the TA according to the historical TA and the downlink timing variation includes:
and taking the sum of the historical TA and a target variable quantity as the TA, wherein the target variable quantity and the downlink timing variable quantity have a specific relation.
The terminal can reduce uplink signal interference.
It should be understood that, in the embodiment of the present invention, the radio frequency unit 801 may be used for receiving and sending signals during a message sending and receiving process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 810; in addition, the uplink data is transmitted to the base station. In general, radio frequency unit 801 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. Further, the radio frequency unit 801 can also communicate with a network and other devices through a wireless communication system.
The terminal provides wireless broadband internet access to the user through the network module 802, such as helping the user send and receive e-mails, browse webpages, access streaming media, and the like.
The audio output unit 803 may convert audio data received by the radio frequency unit 801 or the network module 802 or stored in the memory 809 into an audio signal and output as sound. Also, the audio output unit 803 may also provide audio output related to a specific function performed by the terminal 800 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 803 includes a speaker, a buzzer, a receiver, and the like.
The input unit 804 is used for receiving an audio or video signal. The input Unit 804 may include a Graphics Processing Unit (GPU) 8041 and a microphone 8042, and the Graphics processor 8041 processes image data of a still picture or video obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 806. The image frames processed by the graphics processor 8041 may be stored in the memory 809 (or other storage medium) or transmitted via the radio frequency unit 801 or the network module 802. The microphone 8042 can receive sound, and can process such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 801 in case of a phone call mode.
The terminal 800 also includes at least one sensor 805, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 8061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 8061 and/or the backlight when the terminal 800 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; the sensors 805 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.
The display unit 806 is used to display information input by the user or information provided to the user. The Display unit 806 may include a Display panel 8061, and the Display panel 8061 may be configured by a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.
The user input unit 807 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal. Specifically, the user input unit 807 includes a touch panel 8071 and other input devices 8072. The touch panel 8071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 8071 (e.g., operations by a user on or near the touch panel 8071 using a finger, a stylus, or any other suitable object or accessory). The touch panel 8071 may include two portions of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 810, receives a command from the processor 810, and executes the command. In addition, the touch panel 8071 can be implemented by various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 8071, the user input unit 807 can include other input devices 8072. In particular, other input devices 8072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.
Further, the touch panel 8071 can be overlaid on the display panel 8061, and when the touch panel 8071 detects a touch operation on or near the touch panel 8071, the touch operation is transmitted to the processor 810 to determine the type of the touch event, and then the processor 810 provides a corresponding visual output on the display panel 8061 according to the type of the touch event. Although in fig. 8, the touch panel 8071 and the display panel 8061 are shown as two separate components to implement the input and output functions of the terminal, in some embodiments, the touch panel 8071 and the display panel 8061 may be integrated to implement the input and output functions of the terminal, which is not limited herein.
The interface unit 808 is an interface for connecting an external device to the terminal 800. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 808 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within the terminal 800 or may be used to transmit data between the terminal 800 and external devices.
The memory 809 may be used to store software programs as well as various data. The memory 809 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 809 can include high speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 810 is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 809 and calling data stored in the memory 809, thereby integrally monitoring the terminal. Processor 810 may include one or more processing units; preferably, the processor 810 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 810.
The terminal 800 may also include a power supply 811 (e.g., a battery) for powering the various components, and preferably, the power supply 811 may be logically coupled to the processor 810 via a power management system to provide management of charging, discharging, and power consumption via the power management system.
In addition, the terminal 800 includes some functional modules that are not shown, and are not described in detail herein.
Preferably, an embodiment of the present invention further provides a terminal, including a processor 810, a memory 809, and a computer program stored in the memory 809 and capable of running on the processor 810, where the computer program, when executed by the processor 810, implements each process of the above-mentioned uplink signal sending method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the embodiment of the uplink signal sending method provided in the embodiment of the present invention, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. An uplink signal transmission method applied to a terminal is characterized by comprising the following steps:
calculating an uplink timing advance TA according to parameters of a downlink signal;
sending an uplink signal according to the TA;
wherein, the calculating TA according to the parameter of the downlink signal includes:
if a trigger event for instructing the terminal to calculate the TA occurs and the location information of the terminal is matched with the specific location information, calculating the TA according to the parameters of the downlink signal, where the trigger event includes: triggering specific uplink signal transmission in a non-connection state;
before calculating the TA according to the parameter of the downlink signal, the method further includes:
and receiving the specific position information issued by the network side.
2. The method of claim 1, wherein the specific location information comprises at least one of:
specific frequency point identification, specific frequency band identification, specific cell group identification, specific area position identification and specific operator identification.
3. The method according to any one of claims 1 to 2, wherein said calculating an uplink timing advance TA according to a parameter of a downlink signal comprises:
calculating the TA according to the downlink path loss of the downlink signal; or
Calculating the TA according to the transmission delay of the downlink signal; or
And calculating the TA according to the downlink timing of the downlink signal.
4. The method of claim 3, wherein the transmission delay is obtained by:
and taking the difference between the receiving time of the downlink signal and the sending time of the downlink signal sent by the network side as the transmission delay, wherein the sending time is carried by the system information sent by the network side.
5. The method of claim 3, wherein said calculating the TA based on the downlink path loss of the downlink signal comprises:
calculating the downlink path loss of the downlink signal;
calculating the transmission delay of the downlink signal according to the downlink path loss;
and calculating the TA according to the transmission delay of the downlink signal.
6. The method of claim 5, wherein said calculating said transmission delay of said downlink signal based on said downlink path loss comprises:
and converting the downlink path loss of the downlink signal into the transmission delay of the downlink signal according to the conversion relation between the downlink path loss and the downlink transmission delay.
7. The method of claim 6, wherein the scaling relationship is obtained by one of:
predefining the conversion relation; or
Receiving the conversion relation issued by the network side; or
Obtaining historical TA used historically and historical downlink path loss when the historical TA is used, determining historical downlink transmission delay when the historical TA is used according to the historical TA, and taking the relation between the historical downlink path loss and the historical downlink transmission delay as the conversion relation.
8. The method of claim 6, wherein said calculating the TA based on the downlink timing of the downlink signal comprises:
acquiring historical TA used historically, current downlink timing and historical downlink timing, wherein the historical downlink timing is the downlink timing when the terminal uses the historical TA;
calculating a downlink timing variation, wherein the downlink timing variation is a variation between a current downlink timing and a historical downlink timing;
and calculating the TA according to the historical TA and the downlink timing variation.
9. The method of claim 8, wherein said calculating the TA according to the historical TA and the downlink timing variation comprises:
and taking the sum of the historical TA and a target variable quantity as the TA, wherein the target variable quantity and the downlink timing variable quantity have a specific relation.
10. A terminal, comprising:
the calculation module is used for calculating TA according to the parameters of the downlink signals;
a sending module, configured to send an uplink signal according to the TA;
wherein the calculation module is configured to calculate the TA according to the parameter of the downlink signal if a trigger event for instructing the terminal to calculate the TA occurs and the location information of the terminal matches with specific location information, where the trigger event includes: triggering specific uplink signal transmission in a non-connection state;
the terminal further comprises:
and the first receiving module is used for receiving the specific position information issued by the network side.
11. A terminal, comprising: a memory, a processor and a program stored on the memory and executable on the processor, the program implementing the steps in the method for transmitting uplink signals according to any one of claims 1 to 9 when executed by the processor.
12. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, implements the steps of the uplink signal transmitting method according to any one of claims 1 to 9.
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| WO2021248394A1 (en) * | 2020-06-11 | 2021-12-16 | Zte Corporation | System and method for timing information transmission |
| CN113825227A (en) * | 2020-06-19 | 2021-12-21 | 华为技术有限公司 | Method for determining Timing Advance (TA), network equipment and terminal |
| WO2022011682A1 (en) * | 2020-07-17 | 2022-01-20 | Oppo广东移动通信有限公司 | Wireless communication method, terminal device, and network device |
| KR20230104286A (en) * | 2020-11-17 | 2023-07-07 | 베이징 시아오미 모바일 소프트웨어 컴퍼니 리미티드 | Method, device, communication device and medium for determining uplink transmission resources (METHOD AND APPARATUS FOR DETERMINING UPLINK TRANSMISSION RESOURCE, AND COMMUNICATION DEVICE AND MEDIUM) |
| CN117751637A (en) * | 2021-11-04 | 2024-03-22 | Oppo广东移动通信有限公司 | Wireless communication method, terminal device and network device |
| CN114270962A (en) * | 2021-11-15 | 2022-04-01 | 北京小米移动软件有限公司 | Uplink synchronization method and device and readable storage medium |
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| CN106686669A (en) * | 2015-11-11 | 2017-05-17 | 中兴通讯股份有限公司 | Synchronization method and device |
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| CN1949693B (en) * | 2006-11-24 | 2011-06-08 | 北京中星微电子有限公司 | Method for improving up synchronous transmission accuracy in TD SCDMA |
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| CN101296487A (en) * | 2007-04-28 | 2008-10-29 | 中兴通讯股份有限公司 | Uplink Synchronization method for mobile communication system |
| CN102958075A (en) * | 2011-08-29 | 2013-03-06 | 华为技术有限公司 | Method and device for determining timing advance (TA) |
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