CN102083197A - Method, equipment and system for processing time advance - Google Patents

Method, equipment and system for processing time advance Download PDF

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Publication number
CN102083197A
CN102083197A CN2010106036564A CN201010603656A CN102083197A CN 102083197 A CN102083197 A CN 102083197A CN 2010106036564 A CN2010106036564 A CN 2010106036564A CN 201010603656 A CN201010603656 A CN 201010603656A CN 102083197 A CN102083197 A CN 102083197A
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base station
time
indication
advance
user equipment
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CN102083197B (en
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方志鹏
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

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Abstract

The invention discloses a method, equipment and system for processing time advance. The method comprises the following steps of: receiving an instruction of a base station that user equipment (UE) reports time advance (TA), and transmitting determined TA to a base station according to the instruction. A problem that an uplink timing synchronous relationship between an eNodeB and the UE cannot be realized because the UE actively regulates uplink signal transmission time can be solved.

Description

Method, device and system for processing time advance
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method, equipment and a system for processing a time advance.
Background
In a Long Term Evolution (LTE) system, a Timing Advance (TA) is used to represent a parameter of a timing offset when an evolved base station (eNodeB) receives data transmitted by a User Equipment (UE), and a physical meaning of the parameter refers to a round-trip delay between the UE and the eNodeB. In order to align the time when uplink signals sent by all UEs reach an eNodeB, in an initial random access phase, a base station calculates how long the uplink signals of the UEs need to be sent in advance by measuring the time when a Preamble (Preamble) sent by the UEs reaches the base station, that is, calculates a TA, and sends a random access response message carrying the TA to the UEs. Meanwhile, in the subsequent uplink timing adjustment phase, the eNodeB periodically sends the relative TA to the UE to keep uplink synchronization between the UE and the eNodeB.
In the prior art, the movement of the UE may change the uplink timing synchronization relationship between the UE and the eNodeB. In order to maintain uplink timing synchronization between the UE and the eNodeB, the UE may actively adjust the time for transmitting the uplink signal, and this method results in that the eNodeB cannot implement the uplink timing synchronization relationship with the UE.
Disclosure of Invention
One aspect of the present invention provides a method for processing a timing advance, including:
receiving an indication that a base station informs user equipment of reporting a time advance;
and sending the determined time advance to the base station according to the indication.
Another aspect of the present invention provides a user equipment, comprising:
a receiving unit, configured to receive an indication that a reporting timing advance is notified by a base station; and
and the sending unit is used for sending the determined time advance to the base station according to the indication.
Another aspect of the invention provides a system comprising: the base station is used for sending an indication for informing the user equipment of reporting the time advance to the user equipment; and receiving the time advance sent by the user equipment, and keeping synchronization with the user equipment according to the time advance.
The method, the device and the system for processing the time advance provided by the embodiment of the invention can solve the problem that the UE actively adjusts the time for sending the uplink signal so that the eNodeB cannot realize the uplink timing synchronization relation with the UE.
Drawings
FIG. 1 is a flow chart of a processing method provided by one embodiment of the present invention;
FIG. 2 is a flow chart of a processing method provided by another embodiment of the invention;
FIG. 3 is a flow chart of a processing method provided by yet another embodiment of the invention;
FIG. 4 is a schematic diagram of an apparatus provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of an apparatus provided by another embodiment of the present invention;
FIG. 6 is a schematic diagram of an apparatus according to another embodiment of the present invention;
fig. 7 is a system diagram according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, but 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.
Various embodiments of the present invention may be applicable to an LTE system, and a base station in the LTE system may be specifically an eNodeB.
Referring to fig. 1, an embodiment of the present invention provides a method for processing a timing advance, where the method of the embodiment includes the following steps:
step 101, the UE receives an indication that the base station notifies the UE to report the TA.
And 102, sending the determined TA to the base station according to the indication.
In this embodiment, due to the mobility of the UE, the uplink timing synchronization relationship between the UE and the base station may be changed, and the UE needs to adjust the uplink timing to maintain the uplink timing synchronization, that is, to determine the TA. For example, the UE determines the TA according to a message sent by the base station; as another example, the UE determines the TA according to the message sent by the base station and the UE-determined adjustment value (i.e., TA offset value). After the UE determines the TA, the UE may send the determined TA to the base station according to the indication, and the base station may keep synchronization with the UE according to the TA, and estimate the distance between the UE and the base station, thereby providing an important theoretical basis for network coverage analysis or network quality evaluation.
In this embodiment, the problem that the eNodeB cannot realize the uplink timing synchronization relationship with the UE due to the fact that the UE actively adjusts the time for transmitting the uplink signal can be solved.
Referring to fig. 2, another embodiment of the invention provides a method for timing advance processing. The present embodiment includes the following steps.
Step 201, the UE receives time information and first indication information, where the time information is a period for indicating the UE to report the TA, and the first indication information is used for indicating the UE to report the TA according to the period indicated by the time information.
For example, the UE receives a Radio Resource Control (RRC) Connection Reconfiguration (Connection Reconfiguration) message sent by the base station, where the RRC Connection Reconfiguration message includes an indication that the UE reports the TA, that is, the time information and the first indication information.
Optionally, the ReportConfigEUTRA cell in the RRC Connection Reconfiguration message includes time information and first indication information. For example, if the first indication information is True or 1, it indicates that the UE needs to report the TA according to the period indicated by the time information. Those skilled in the art can understand what type and occupied bit number of the first indication information do not affect the implementation of the embodiment of the present invention, and details are not described here.
Step 202, the UE sends the determined TA to the base station according to the first indication information and the time information.
In this step, the UE may determine the TA first, and then send the determined TA to the base station according to the period indicated by the time information. For example, the UE sends a Measurement Report (Measurement Report) message to the base station, where the Measurement Report message includes the determined TA, for example, a MeasResultEUTRA cell in the message is used to indicate the TA determined by the UE. As another example, the UE sends a Media Access Control (MAC) message to the base station, where the MAC message includes the determined TA. Optionally, the MAC message includes a MAC Control Elements cell, where the cell is used to indicate the TA determined by the UE.
Suppose TA determined by the UE in the Mth period is NTA，newThe TA determined and/or sent to the base station in the M-1 th period is NTA，oldThen UE in Mth cycle, first according to NTA，oldAnd NTA1Determining a tentative TA (i.e., N)tmp) Then according to NtmpAnd NTA2Determining NTA，newThen the UE sends N according to the period indicated by the time informationTA，newAnd sending the data to a base station. Where M is an integer greater than or equal to 2.
Optionally, NtmpIs NTA，old+(NTA1-31)×16，NTA，newIs Ntmp+NTA2. N is aboveTA1Is the first time advance offset value received by the UE. For example, the UE receives a TA command sent by the base station, the command indicating NTA1May be any value of 0 to 63. N is aboveTA2The second timing advance offset value determined for the UE is a parameter used by the UE to adjust the TA in addition to the TA in compliance with the indication of the base station, the parameter being determined by the UE. For example, the UE is according to TsDetermined second timing advance offset value NTA2. Let T besWhen the current downlink bandwidth is 1.4MHz in 1/(15000 × 2048) second, the UE determines NTA2Is 4 x TsWhen is coming into contact withWhen the previous downlink bandwidth is greater than or equal to 3MHz, the N determined by the UETA2Is 2 x Ts。
That is, the UE determining TA includes the UE transmitting a first timing advance offset value N from the base stationTA1And a UE determined second timing advance offset value NTA2The TA is determined. For example, the UE receives a TA command and follows the N indicated by the TA command during the uplink timing adjustment phaseTA1Is evaluated to determine Ntmp. Then, the UE determines and transmits the TA to the base station according to the period indicated by the time information. Assuming that the period indicated by the time information is 200ms, the UE will be according to N every 200msTA，oldAnd NTA2Determining N onceTA，newAnd transmitted to the base station.
It should be noted that the UE may determine the timing advance N of the M-1 th period by using different methodsTA，old. For example, if the UE is in the initial random access phase at the M-1 th cycle, NTA， oldIs NTA1X 16, the number NTA1Is the value of the TA command (the TA command may be 11 bits) carried by the random access response message sent by the base station to the UE, and is a parameter used when the base station indicates the UE to adjust the TA. Wherein, in the initial random access phase, the NTA1And may be any value from 0 to 1282. As another example, if the UE has completed random access in the M-1 th period, e.g., in the uplink timing adjustment phase after the initial random access phase, NTA，oldTiming advance determined for UE in M-2 period and (N)TA1-31) x 16 or, NTA，oldTiming advance determined for UE in M-2 period and (N)TA1-31) × 16, and NTA2And (4) summing.
In this embodiment, the UE receives the time information and the first indication information sent by the base station, and sends the determined TA to the base station according to the period indicated by the time information, so as to solve the problem that the eNodeB cannot implement the uplink timing synchronization relationship with the UE due to the UE actively adjusting the time for sending the uplink signal, and implement that the UE periodically and actively reports the TA.
Referring to fig. 3, another embodiment of the invention provides a method for processing a timing advance. The embodiment comprises the following steps:
step 301, the UE receives second indication information, where the second indication information is used to indicate the UE to report the TA after determining the TA.
For example, the UE receives an RRC Connection Reconfiguration message sent by the base station, where the message includes an indication that the UE reports the TA, that is, the second indication information. For example, the ReportConfigEUTRA cell in the message includes the second indication information. For example, if the second indication information is True or 1, it indicates that the UE needs to report the TA after determining the TA. Those skilled in the art can understand what type and occupied bit number of the second indication information do not affect the implementation of the embodiment of the present invention, and details are not described here.
Step 302, sending the adjusted TA to the base station according to the second indication information.
For example, the UE sends a Measurement Report (Measurement Report) message to the base station, where the Measurement Report message includes the adjusted TA.
As another example, the UE sends a Media Access Control (MAC) message to the base station, where the MAC message includes the adjusted TA. Optionally, the MAC message includes a MAC control elements cell, where the cell is used to indicate the TA adjusted by the UE.
Suppose TA determined this time by the UE is NTA，newThe last (i.e., most recent) TA determined and/or transmitted to the base station is NTA，oldThen, the implementation manner of the UE determining the TA this time is: first according to NTA，oldAnd NTA1Determining a tentative TA (i.e., N)tmp) Then according to NtmpAnd NTA2Determining NTA，newAnd then the UE reports the TA after determining the TA.
Optionally, NtmpIs NTA，old+(NTA1-31)×16，NTA，newIs Ntmp+NTA2. N is aboveTA1Is the first time advance offset value received by the UE. E.g. UEReceiving a TA command sent by a base station, wherein the command indicates NTA1May be any value of 0 to 63. N is aboveTA2The second timing advance offset value determined for the UE is a parameter used by the UE to adjust the TA in addition to the TA in compliance with the indication of the base station, the parameter being determined by the UE. For example, the UE is according to TsDetermined second timing advance offset value NTA2. Let T besWhen the current downlink bandwidth is 1.4MHz in 1/(15000 × 2048) second, the UE determines NTA2Is 4 x TsWhen the current downlink bandwidth is greater than or equal to 3MHz, the N determined by the UETA2Is 2 x Ts。
It should be noted that the UE may determine the timing advance N of the M-1 th period by using different methodsTA，oldFor example, refer to the examples provided in the above embodiments, and the description is omitted here.
In this embodiment, by receiving the second indication information sent by the base station, and after determining the TA, sending the determined TA to the base station, the problem that the uplink timing synchronization relationship between the eNodeB and the UE cannot be realized due to the UE actively adjusting the time for sending the uplink signal is solved, and the UE actively reports the adjusted TA after adjusting the TA is realized.
Referring to fig. 4, an embodiment of the present invention provides a user equipment, where the user equipment of the embodiment includes: a receiving unit 11 and a transmitting unit 12; the receiving unit 11 is configured to receive an indication that the base station notifies the reporting of the TA; the sending unit 12 is configured to send the determined TA to the base station according to the indication.
The user equipment of this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 1, and the implementation principle thereof is similar, and is not described here again.
In this embodiment, by receiving an indication that the base station notifies the UE to report the TA, and sending the determined TA to the base station according to the indication, the problem that the eNodeB cannot achieve the uplink timing synchronization relationship with the UE due to the UE actively adjusting the time for sending the uplink signal is solved, and the UE actively reports the TA is achieved.
Referring to fig. 5, another embodiment of the present invention provides a user equipment, which further includes a processing unit 13, configured to determine a second time advance offset value, based on the embodiment shown in fig. 4.
Further, the indication received by the receiving unit 11 may include time information and first indication information, where the time information is a period indicating reporting of the time advance, and the first indication information is used to indicate reporting of the TA according to the period indicated by the time information. The transmitting unit 12 is specifically configured to transmit the determined time advance N in the mth periodTA，newTo the base station, NTA，newIs NTA，old+(NTA1-31)×16+NTA2Wherein N isTA，oldA timing advance for the transmitting unit 12 to transmit to the base station in the M-1 th cycle; n is a radical ofTA1Is the first timing advance offset value received by the receiving unit 11; n is a radical ofTA2A second time advance offset value determined for the processing unit 13.
Alternatively, the indication received by the receiving unit 11 may include second indication information, where the second indication information is used to indicate that the adjusted TA is reported after the TA is adjusted. The transmitting unit 12 is specifically adapted to transmit the adjusted timing advance NTA，newTo the base station, NTA，newIs NTA，old+(NTA1-31)×16+NTA2Wherein N isTA，oldThe adjusted time advance sent to the base station for the last UE; n is a radical ofTA1Is the first timing advance offset value received by the receiving unit 11; n is a radical ofTA2A second time advance offset value determined for the processing unit 13.
Wherein M is greater than or equal to 2 and is an integer.
Optionally, the determined TA may be carried in a measurement report message or an MAC message sent by the sending unit 12 to the base station. Optionally, the indication notifying reporting of the TA is carried in the RRCConnection Reconfiguration message of the receiving unit 11.
The user equipment of this embodiment may be configured to execute the technical solutions of the method embodiments shown in fig. 2 or fig. 3, and the implementation principles thereof are similar and will not be described herein again. The UE of this embodiment solves the problem that the eNodeB cannot implement the uplink timing synchronization relationship with the UE due to the UE actively adjusting the time for transmitting the uplink signal, and implements periodic TA reporting or actively TA reporting after each adjustment.
Referring to fig. 6, another embodiment of the present invention provides an apparatus, which may be a base station. The apparatus comprises a transmitting unit 21 and a receiving unit 22. The sending unit 21 is configured to send an indication notifying the user equipment of reporting the timing advance to the user equipment; and the receiving unit 22 receives the timing advance sent by the user equipment and keeps synchronization with the user equipment according to the timing advance.
Optionally, the sending unit 21 is specifically configured to send time information and first indication information to the user equipment, where the time information is a period indicating that the user equipment reports the time advance, and the first indication information is used to indicate that the user equipment reports the time advance according to the period indicated by the time information; wherein, the time information and the first indication information can be carried in the radio resource control connection reconfiguration message; or, the sending unit 21 is specifically configured to send second indication information to the user equipment, where the second indication information is used to indicate that the user equipment reports the adjusted time advance after adjusting the time advance. Wherein the second indication information may be carried in the radio resource control connection reconfiguration message.
Optionally, the receiving unit 22 receives a measurement report message sent by the ue, where the measurement report message includes a timing advance; alternatively, the receiving unit 22 receives a medium access control message sent by the user equipment, where the medium access control message includes a timing advance.
Referring to fig. 7, a system according to an embodiment of the present invention includes a base station 31 and a UE 32, where the base station is configured to send an indication notifying the UE 32 to report a TA to the UE 32, receive the TA sent by the UE 32, and keep synchronization with the UE 32 according to the TA.
Optionally, the indication sent by the base station 31 may include time information and first indication information, where the time information indicates a period in which the UE 32 reports the TA, and the first indication information is used to indicate the UE 32 to report the TA according to the period indicated by the time information; or, the indication sent by the base station 31 includes second indication information, where the second indication information is used to indicate the UE 32 to report the adjusted TA after adjusting the TA.
Optionally, the time information and the first indication information or the second indication information sent by the base station 31 may be carried in an RRC Connection Reconfiguration message.
Optionally, the base station 31 receives a measurement report message sent by the UE 32, where the measurement report message includes a TA; alternatively, the base station 31 receives a MAC message sent by the UE 32, where the MAC message includes the TA.
Optionally, the UE 32 may execute the technical solution of the embodiment of the method shown in any one of fig. 1 to fig. 3, and the principle thereof is similar, and is not described here again.
The system of the embodiment solves the problem that the uplink timing synchronization relationship between the eNodeB and the UE cannot be realized due to the fact that the UE actively adjusts the time for transmitting the uplink signal, and realizes periodic TA reporting or active TA reporting after each adjustment.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (18)

1. A method for processing a timing advance is characterized by comprising the following steps:
receiving an indication that a base station informs user equipment of reporting a time advance;
and sending the determined time advance to the base station according to the indication.
2. The method of claim 1, wherein the indication comprises time information and first indication information, the time information is a period indicating that the ue reports the time advance, and the first indication information is used to indicate that the ue reports the time advance according to the period indicated by the time information.
3. The method for processing the timing advance according to claim 2, wherein the sending the determined timing advance to the base station according to the indication comprises:
sending the determined time advance to the base station according to the first indication information and the time information;
wherein the user equipment sends the determined time advance N to the base station in the Mth periodTA，newIs NTA，old+(NTA1-31)×16+NTA2Wherein N isTA，oldA time advance sent to the base station for the user equipment in the M-1 th period; n is a radical ofTA1A first timing advance offset value sent to user equipment by the base station; n is a radical ofTA2A second timing advance offset value, M, determined for the user equipment, is greater than or equal to 2 and is an integer.
4. The method of claim 1, wherein the indication comprises second indication information, and the second indication information is used to indicate that the ue reports the adjusted time advance after adjusting the time advance.
5. The method for processing the timing advance according to claim 4, wherein the sending the determined timing advance to the base station according to the indication comprises:
according to the second indication information, after the time lead is adjusted, the adjusted time lead is sent to the base station;
wherein the UE sends the adjusted time advance NTA，newIs NTA，old+(NTA1-31)×16+NTA2Wherein N isTA，oldThe adjusted time advance sent to the base station for the user equipment at the last time; n is a radical ofTA1A first timing advance offset value sent to user equipment by the base station; n is a radical ofTA2A second timing advance offset value determined for the user equipment.
6. The method for processing the timing advance according to claim 3 or 5, wherein the N isTA2According to T for the user equipmentsA determined second time advance offset value, wherein Ts1/(15000 × 2048) seconds.
7. The method for processing the timing advance according to any one of claims 1 to 6, wherein the sending the determined timing advance to the base station includes:
sending a measurement report message to the base station, wherein the measurement report message comprises the determined time advance; or,
and sending a medium access control message to the base station, wherein the medium access control message comprises the determined time advance.
8. The method as claimed in any one of claims 1 to 6, wherein the receiving the indication that the base station notifies the ue of reporting the timing advance comprises:
and receiving a radio resource control connection reconfiguration message sent by a base station, wherein the radio resource control connection reconfiguration message comprises an indication for notifying the user equipment to report the time advance.
9. A user device, comprising:
a receiving unit, configured to receive an indication that a reporting timing advance is notified by a base station; and
and the sending unit is used for sending the determined time advance to the base station according to the indication.
10. The user equipment of claim 9,
the indication comprises time information and first indication information, the time information is a period for indicating reporting of the time lead, and the first indication information is used for indicating reporting of the time lead according to the period indicated by the time information; or,
the indication comprises second indication information, and the second indication information is used for indicating that the adjusted time lead is reported after the time lead is adjusted.
11. The user equipment of claim 10, wherein the user equipment further comprises a processing unit configured to determine a second time advance offset value;
if the indication includes time information and first indication information, the sending unit is specifically configured to: transmitting the determined time advance N in the Mth periodTA，newTo the base station, the NTA，newIs NTA， old+(NTA1-31)×16+NTA2Wherein N isTA，oldA timing advance for the transmitting unit to transmit to the base station in the M-1 th cycle; n is a radical ofTA1A first timing advance offset value received by the receiving unit; n is a radical ofTA2A second timing advance offset value determined for the processing unit; or,
if the indication includes second indication information, the sending unit is specifically configured to: sending the adjusted timing advance NTA，newTo the base station, the NTA，newIs NTA，old+(NTA1-31)×16+NTA2Wherein N isTA，oldThe adjusted time advance sent to the base station for the user equipment at the last time; n is a radical ofTA1A first timing advance offset value received by the receiving unit; n is a radical ofTA2A second timing advance offset value, M, determined for the processing unit, is greater than or equal to 2 and is an integer.
12. The UE of any of claims 9 to 11, wherein the determined timing advance is carried in a measurement report message or a media access control message sent by a sending unit to the BS.
13. The UE of claim 10 or 11, wherein the indication for notifying reporting the TA is carried in a RRC connection reconfiguration message received by the receiving unit.
14. A system is characterized by comprising a base station, wherein the base station is used for sending an indication for informing a user equipment to report a time advance to the user equipment; and receiving the time advance sent by the user equipment, and keeping synchronization with the user equipment according to the time advance.
15. The system of claim 14,
the base station is specifically configured to send time information and first indication information to the ue, where the time information indicates a period for reporting a timing advance by the ue, and the first indication information is used to indicate the ue to report the timing advance according to the period indicated by the time information; or,
the base station is specifically configured to send second indication information to the user equipment, where the second indication information is used to indicate that the user equipment reports the adjusted time advance after adjusting the time advance.
16. The system of claim 15, wherein the time information and the first indication information are carried in a radio resource control connection reconfiguration message; or,
the second indication information is carried in the radio resource control connection reconfiguration message.
17. The system according to claim 14, wherein said base station receives a measurement report message sent by said ue, said measurement report message including said timing advance; or,
and the base station receives a media access control message sent by the user equipment, wherein the media access control message comprises the time advance.
18. The system according to any one of claims 14 to 17, further comprising a ue, wherein the ue is configured to receive an indication that the base station notifies the ue of reporting a timing advance; and sending the determined time advance to the base station according to the indication.
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