CN108377504B

CN108377504B - Method, device, base station and terminal for enhancing non-random access switching

Info

Publication number: CN108377504B
Application number: CN201611031333.6A
Authority: CN
Inventors: 董洪; 孙立新; 丁颖哲; 周明宇
Original assignee: Baicells Technologies Co Ltd
Current assignee: Baicells Technologies Co Ltd
Priority date: 2016-11-18
Filing date: 2016-11-18
Publication date: 2020-02-07
Anticipated expiration: 2036-11-18
Also published as: WO2018090952A1; CN108377504A

Abstract

The invention provides a method, a device, a base station and a terminal for enhancing non-random access switching, which solve the problem that in the non-random access switching process, due to the fact that errors exist in TA measured by UE, RRC connection reconfiguration completion messages and subsequent uplink data are difficult to reliably receive easily if the error adjustment is not carried out on the TA of the UE. The method of the invention comprises the following steps: in the non-random access switching process, if a Radio Resource Control (RRC) connection reconfiguration completion message sent by a terminal is successfully acquired, measuring a TA (timing advance) adjustment value according to an acquired transmission signal for transmitting the RRC connection reconfiguration completion message; and sending the measured TA adjusting value to the terminal, so that the terminal can adjust the TA measured by the terminal according to the TA adjusting value, the error of the TA of the UE is adjusted, the receiving reliability of the RRC connection reconfiguration completion message is improved, and the receiving reliability of the subsequent uplink transmission data of the UE is improved.

Description

Method, device, base station and terminal for enhancing non-random access switching

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a base station, and a terminal for enhancing non-random access handover.

Background

In a current Long Term Evolution (LTE) R14 system, in order to reduce delay caused by handover, non-random access (RACH-less) handover is introduced, and a User Equipment (UE) calculates a Timing Advance (TA) of a target cell and then performs uplink transmission in the target cell using the calculated TA.

In the TA of the target cell calculated by the UE, due to the delay measured by the UE, the measurement error, and the accumulation of the measurement error in the calculation, the TA calculated by the UE may have a large error, so that when the UE sends a Radio Resource Control (RRC) connection reconfiguration complete message in the target cell, an uplink signal arriving at an Evolved Node B (eNB) is caused to have a time offset, and if the time offset is not processed, the time offset may cause unreliable reception of the RRC connection reconfiguration complete message. Further, if the TA of the UE is not adjusted by an error, unreliable reception of subsequent uplink transmission may be caused.

Disclosure of Invention

The invention aims to provide a method, a device, a base station and a terminal for enhancing non-random access switching, which are used for solving the problem that an RRC connection reconfiguration completion message and subsequent uplink data are difficult to reliably receive due to the fact that the TA measured by UE has errors in the non-random access switching process and if the TA of the UE is not subjected to error adjustment.

In order to achieve the above object, the present invention provides an enhancing method for non-random access handover, which is applied to a base station and includes:

in the process of non-random access switching, if a Radio Resource Control (RRC) connection reconfiguration completion message sent by a terminal is successfully acquired, measuring a TA (timing advance) adjustment value according to an acquired transmission signal for transmitting the RRC connection reconfiguration completion message;

and sending the measured TA adjusting value to the terminal.

In order to achieve the above object, an embodiment of the present invention further provides an apparatus for enhancing non-random access handover, which is applied to a base station, and includes:

a measurement module, configured to, in a non-random access handover process, if a radio resource control, RRC, connection reconfiguration complete message sent by a terminal is successfully acquired, measure a timing advance TA adjustment value according to an acquired transmission signal used for transmitting the RRC connection reconfiguration complete message;

and the first sending module is used for sending the measured TA adjusting value to the terminal.

In order to achieve the above object, an embodiment of the present invention further provides a base station, including:

a first processor, configured to, in a non-random access handover process, if a radio resource control, RRC, connection reconfiguration complete message sent by a terminal is successfully acquired, measure a timing advance TA adjustment value according to an acquired transmission signal used for transmitting the RRC connection reconfiguration complete message;

a first transmitter, configured to transmit the measured TA adjustment value to the terminal.

In order to achieve the above object, an embodiment of the present invention further provides an enhanced method for non-random access handover, which is applied to a terminal, and includes:

in the process of non-random access switching, sending a Radio Resource Control (RRC) connection reconfiguration completion message to a base station;

and acquiring a TA adjusting value sent by the base station after the RRC connection reconfiguration completing message is successfully acquired, wherein the TA adjusting value is measured by the base station according to a transmission signal for transmitting the RRC connection reconfiguration completing message.

In order to achieve the above object, an embodiment of the present invention further provides an apparatus for enhancing non-random access handover, which is applied to a terminal, and includes:

a second sending module, configured to send a radio resource control, RRC, connection reconfiguration complete message to the base station in a non-random access handover process;

an obtaining module, configured to obtain a TA adjustment value sent by a base station after the RRC connection reconfiguration complete message is successfully obtained by the base station, where the TA adjustment value is obtained by the base station according to measurement of a transmission signal used for transmitting the RRC connection reconfiguration complete message.

In order to achieve the above object, an embodiment of the present invention further provides a terminal, including:

a second transmitter, configured to send a radio resource control, RRC, connection reconfiguration complete message to the base station in a non-random access handover process;

and the receiver is used for acquiring a TA adjusting value sent by the base station after the RRC connection reconfiguration complete message is successfully acquired, wherein the TA adjusting value is measured by the base station according to a transmission signal used for transmitting the RRC connection reconfiguration complete message.

The technical scheme of the invention has the following beneficial effects:

in the method for enhancing non-random access switching, if a Radio Resource Control (RRC) connection reconfiguration complete message sent by a terminal is successfully acquired in the non-random access switching process, a Timing Advance (TA) adjustment value is measured according to an acquired transmission signal for transmitting the RRC connection reconfiguration complete message; and sending the measured TA adjusting value to the terminal, so that the terminal can adjust the TA measured by the terminal according to the TA adjusting value, the error of the TA of the UE is adjusted, the receiving reliability of the RRC connection reconfiguration completion message is improved, and the receiving reliability of subsequent uplink transmission data of the UE is improved.

Drawings

Fig. 1 is a flowchart of a first embodiment of a method for enhancing non-random access handover according to the present invention applied to a base station;

fig. 2 is a first interaction flowchart of a base station and a terminal in the enhanced method for non-random access handover according to the present invention;

FIG. 3 is a flowchart illustrating an enhanced method for non-random access handover according to a second embodiment of the present invention applied to a base station;

fig. 4 is a second interaction flowchart of a base station and a terminal in the method for enhancing non-random access handover according to the present invention;

FIG. 5 is a schematic structural diagram of an enhanced apparatus for non-random access handover according to the present invention applied to a base station;

FIG. 6 is a schematic diagram of a base station according to the present invention;

fig. 7 is a flowchart of a sixth embodiment of the enhanced method for non-random access handover according to the present invention applied to a terminal;

fig. 8 is a flowchart of a seventh embodiment of the enhanced method for non-random access handover according to the present invention applied to a terminal;

fig. 9 is a third interaction flowchart of a base station and a terminal in the method for enhancing non-random access handover according to the present invention;

fig. 10 is a schematic structural diagram of an enhanced apparatus for non-random access handover according to the present invention applied to a terminal;

fig. 11 is a schematic structural diagram of the terminal of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings.

Embodiments of the present invention provide a method, an apparatus, a base station, and a terminal for enhancing non-random access handover, which solve the problem that in the non-random access handover process, since a TA measured by a UE has an error, if the TA of the UE is not adjusted by the error, it is easy to cause that an RRC connection reconfiguration complete message and subsequent uplink data are difficult to reliably receive.

First embodiment

As shown in fig. 1, an embodiment of the present invention provides an enhanced method for non-random access handover, which is applied to a base station, and the enhanced method includes:

step 101: in the process of non-random access switching, if a Radio Resource Control (RRC) connection reconfiguration complete message sent by a terminal is successfully acquired, a Timing Advance (TA) adjustment value is measured according to an acquired transmission signal for transmitting the RRC connection reconfiguration complete message.

In the non-access handover process, the UE obtains a transmission resource (transmission signal) of the RRC connection reconfiguration complete message through the target base station or the source base station, where the transmission signal for transmitting the RRC connection reconfiguration complete message may specifically be a physical uplink shared channel, PUSCH, transmission signal. Specifically, the step 101 may specifically include: and measuring the TA adjusting value according to the acquired Physical Uplink Shared Channel (PUSCH) transmission signal used for transmitting the RRC connection reconfiguration completion message.

In the embodiment of the invention, when the TA error calculated by the UE is not large, the RRC connection reconfiguration completion message can be correctly received by the target base station, and under the condition, the target base station can measure the TA adjusting value according to the physical uplink shared channel PUSCH and send the TA adjusting value to the UE so as to adjust the error of the TA calculated by the UE.

Step 102: and sending the measured TA adjusting value to a terminal.

And the terminal adjusts the TA calculated by the terminal according to the received TA adjusting value, so that the receiving reliability of the RRC connection reconfiguration completing message is improved, and the receiving reliability of subsequent uplink data is further improved.

The following describes an interaction procedure between a base station and a terminal in the embodiment of the present invention with reference to fig. 2.

As shown in fig. 2, the above interaction process includes:

step 201: and the terminal sends an RRC connection reconfiguration completion message to the target base station.

Step 202: the target base station successfully acquires the RRC connection reconfiguration complete message and measures a TA (timing advance) adjusting value according to a transmission signal for transmitting the RRC connection reconfiguration complete message.

Step 203: and the target base station sends a confirmation message that the RRC connection reconfiguration completion message is successfully acquired to the terminal.

Step 204: and the target base station sends TA signaling carrying the TA adjusting value to the terminal.

And the terminal adjusts the TA calculated by the terminal according to the obtained TA adjusting value, so that the receiving reliability of subsequent uplink data is improved.

In the method for enhancing non-random access switching, if a Radio Resource Control (RRC) connection reconfiguration complete message sent by a terminal is successfully acquired in the non-random access switching process, a Timing Advance (TA) adjustment value is measured according to a transmission signal for transmitting the RRC connection reconfiguration complete message; and sending the measured TA adjusting value to the terminal, so that the terminal can adjust the TA measured by the terminal according to the TA adjusting value, the error of the TA of the UE is adjusted, the receiving reliability of the RRC connection reconfiguration completion message is improved, and the receiving reliability of the subsequent uplink transmission data of the UE is improved.

Second embodiment

As shown in fig. 3, an embodiment of the present invention provides an enhanced method for non-random access handover, which is applied to a base station, and includes:

step 301: in the process of non-random access switching, if a Radio Resource Control (RRC) connection reconfiguration complete message sent by a terminal is successfully acquired, measuring the TA adjusting value according to an acquired Physical Uplink Shared Channel (PUSCH) transmission signal for transmitting the RRC connection reconfiguration complete message.

In an embodiment of the present invention, the TA adjustment value may be measured according to a cyclic prefix CP, a demodulation reference signal DMRS, or a sounding reference signal SRS in a PUSCH transmission signal, which will be described below.

(1) The TA adjustment value is measured according to a cyclic prefix CP in a PUSCH transmission signal.

At this time, the step 301 specifically includes: determining a Cyclic Prefix (CP) starting time of a data symbol in the PUSCH transmission signal; and obtaining the TA adjusting value according to the difference value between the determined CP starting time and the CP starting time of the data symbols in the pre-allocated PUSCH resources.

In the PUSCH transmission signal, the step of determining a cyclic prefix CP start time of a data symbol may specifically include: sampling the PUSCH transmission signal to obtain a data symbol; selecting a section of data with the length same as that of the CP from the sampled data symbols; and comparing the selected section of data with the sampled data at the tail part of the data symbol to obtain the starting time of the CP of the data symbol.

The base station samples in the time domain of the PUSCH transmission signal for transmitting the RRC connection reconfiguration complete message, specifically, intercepts a data symbol through a sliding window, selects a segment of data with the same length as the CP in the data symbol, compares the segment of data with the data at the tail of the data symbol, and determines the start position of the sliding window as the start time of the CP of the data symbol when the data at the tail of the data symbol is the same as the selected segment of data; and obtaining a TA adjusting value according to the difference value between the starting time of the CP and the starting time of the CP of the data symbols in the pre-allocated PUSCH resources. The data symbol is specifically an orthogonal frequency division multiplexing, OFDM, symbol.

(2) The TA adjustment value is measured according to a demodulation reference signal DMRS in a PUSCH transmission signal.

At this time, the step 301 specifically includes: determining the position of a demodulation reference signal (DMRS) in the PUSCH transmission signal, wherein the correlation degree of the DMRS sequence demodulated at the determined position and the DMRS sequence in the pre-allocated PUSCH resource is the highest; and comparing the determined position of the DMRS with the position of the DMRS in the pre-allocated PUSCH resource to obtain the TA adjusting value.

In the embodiment of the invention, a base station finds the time position of a DMRS in a PUSCH transmission signal for transmitting an RRC connection reconfiguration completion message, then slides left and right from the time position until a position is found, determines the position as the position of the DMRS when the correlation degree of the DMRS sequence demodulated at the position and the DMRS sequence in the PUSCH resource allocated in advance is highest, and compares the determined position of the DMRS with the position of the DMRS in the PUSCH resource allocated in advance to obtain the TA adjustment value.

(3) The TA adjustment value is measured from a sounding reference signal SRS in a PUSCH transmission signal.

At this time, the step 301 specifically includes: determining the position of a Sounding Reference Signal (SRS) in the PUSCH transmission signal, wherein the correlation degree between an SRS sequence demodulated at the determined position and an SRS sequence in a pre-allocated PUSCH resource is the highest; and comparing the determined position of the SRS with the position of the SRS in the pre-allocated PUSCH resource to obtain the TA adjusting value.

In the embodiment of the invention, the base station finds the time position of the SRS in the PUSCH transmission signal for transmitting the RRC connection reconfiguration completion message, then slides left and right from the time position until finding a position, determines the position as the position of the SRS if the correlation degree of the SRS sequence demodulated at the position and the SRS sequence in the PUSCH resource allocated in advance is highest, and compares the determined position of the SRS with the position of the SRS in the PUSCH resource allocated in advance to obtain the TA adjusting value.

Step 302: and sending the measured TA adjusting value to the terminal.

And the terminal adjusts the TA calculated by the terminal according to the obtained TA adjusting value, so that the receiving reliability of the RRC connection reconfiguration completing message is improved, and the receiving reliability of subsequent uplink data is further improved.

In the method for enhancing non-random access switching of the embodiment of the invention, in the process of non-random access switching, if a Radio Resource Control (RRC) connection reconfiguration completion message sent by a terminal is successfully acquired, the TA adjusting value is measured according to a Physical Uplink Shared Channel (PUSCH) transmission signal for transmitting the RRC connection reconfiguration completion message; and sending the measured TA adjusting value to the terminal, so that the terminal can adjust the TA measured by the terminal according to the TA adjusting value, the error of the UE TA is adjusted, the receiving reliability of the RRC connection reconfiguration completion message is improved, and the receiving reliability of subsequent uplink transmission data of the UE is improved.

Third embodiment

The embodiment of the invention also provides a method for enhancing the non-random access switching, which is applied to a base station and comprises the following steps:

in the non-random access switching process, if the radio resource control RRC connection reconfiguration complete message sent by the terminal is not successfully acquired and the transmission frequency of the RRC connection reconfiguration complete message does not reach the preset maximum retransmission frequency, the time window of the acquired resource for acquiring the RRC connection reconfiguration complete message is expanded, and the acquired resource after the time window expansion is used for acquiring the RRC connection reconfiguration complete message sent by the terminal again, or

And expanding the CP length of the acquired resource, and acquiring the RRC connection reconfiguration completion message sent by the terminal by adopting the expanded CP by using the acquired resource after the CP length expansion.

The acquired resource may specifically be a resource pre-configured by the base station.

In the embodiment of the present invention, the time window for acquiring the resource may be expanded according to a corresponding relationship between a preset expansion step value and the number of retransmissions of the RRC connection reconfiguration complete message, where the expansion step value increases with the increase of the number of retransmissions. For example, when the RRC connection reconfiguration complete message is not successfully acquired during the first transmission, the base station expands the time window by 2 OFDM symbols, and when the second transmission is still unsuccessful, expands the time window by 4 OFDM symbols.

In the embodiment of the present invention, the CP length of the acquired resource may be extended according to a correspondence between a pre-agreed CP extended length value and the number of retransmissions of the RRC connection reconfiguration complete message, where the CP extended length value increases with the increase of the number of retransmissions. The correspondence relationship may be pre-agreed by both the base station and the terminal, or may be pre-configured by the base station.

The following describes in detail an interaction procedure between a base station and a terminal when an RRC connection reconfiguration complete message is not successfully acquired and the transmission frequency of the RRC connection reconfiguration complete message does not reach a preset maximum retransmission frequency in the embodiment of the present invention.

As shown in fig. 4, an interaction procedure between a base station and a terminal in the embodiment of the present invention includes:

step 401: and the terminal sends an RRC connection reconfiguration completion message to the target base station.

Step 402: and the target base station fails to acquire the RRC connection reconfiguration complete message and sends a feedback message for indicating the failure of acquiring the RRC connection reconfiguration complete message to the terminal.

Step 403: the target base station adopts an enhanced method to improve the receiving success rate of the next RRC connection reconfiguration completion message.

The method of enhancement here may specifically include the following two.

1. The target base station expands the reception window.

The length of a radio frame is 10ms, which includes 10 subframes, each subframe includes two slots, each radio frame is equal to 140 symbols (conventional), and the target base station in the embodiment of the present invention expands the time window of receiving the PUSCH signal of the RRC connection reconfiguration complete message, specifically, the time length of one symbol may be expanded forward and backward simultaneously, or only the corresponding time length may be expanded forward or backward. Within this extended time window, the method flow shown in fig. 2 is employed to attempt to receive an RRC connection reconfiguration complete message and measure the TA adjustment value.

In order not to introduce interference in the extended time window, the base station needs to have the base station's cell not transmit signals for an extended time.

The base station may adopt a method of setting a certain step size to gradually enlarge the receiving window. For example, when the RRC connection reconfiguration complete message of the UE is transmitted for the first time, the base station expands the receive window by 2 symbols, and when the transmission for the second time is still unsuccessful, the base station expands the receive window by 4 symbols.

2. And the target base station receives the RRC connection reconfiguration complete message sent by the terminal by adopting the extended CP by using the extended CP.

And the UE adopts a CP which is longer than the normal CP when sending the RRC connection reconfiguration complete message. The base station tries to receive the RRC connection reconfiguration complete message and measures the TA adjustment value by using the corresponding CP length and using the method flow shown in fig. 2.

Step 404: and the transmission times of the RRC connection reconfiguration completing message do not reach the preset maximum retransmission times, and the terminal retransmits the RRC connection reconfiguration completing message.

Step 405: and the target base station successfully acquires the RRC connection reconfiguration finishing message and measures a TA (timing advance) adjusting value according to the sending resource for transmitting the RRC connection reconfiguration finishing message.

The transmission resource herein may specifically be a PUSCH transmission resource.

Step 406: and the target base station sends a confirmation message that the RRC connection reconfiguration completion message is successfully acquired to the terminal.

Step 407: and the target base station sends TA signaling carrying the TA adjusting value to the terminal.

When the TA error calculated by the UE is so large that the first transmission of the RRC connection reconfiguration complete message cannot be successfully acquired by the target base station. In this case, the target base station may use the enhanced method to improve the probability of successful acquisition of the next RRC connection reconfiguration complete message. And when the RRC connection reconfiguration completion message is successfully acquired, the target base station sends the measured TA adjusting value to the UE so as to adjust the error of the TA calculated by the UE.

The method for enhancing the non-random access switching enables the target cell to adjust the error of the UE TA under the condition that the UE TA has the error, improves the receiving reliability of the RRC connection reconfiguration completion message, and further improves the receiving reliability of the subsequent uplink transmission data of the UE.

Fourth embodiment

As shown in fig. 5, an embodiment of the present invention further provides an apparatus 500 for enhancing non-random access handover, which is applied to a base station, and includes:

a measuring module 501, configured to, in a non-random access handover process, if a radio resource control, RRC, connection reconfiguration complete message sent by a terminal is successfully acquired, measure a timing advance TA adjustment value according to an acquired transmission signal used for transmitting the RRC connection reconfiguration complete message;

a first sending module 502, configured to send the measured TA adjustment value to a terminal.

In the apparatus for enhancing non-random access handover according to the embodiment of the present invention, the measurement module 501 is configured to measure the TA adjustment value according to the obtained PUSCH transmission signal for transmitting the RRC connection reconfiguration complete message.

In the apparatus for enhancing non-random access handover according to the embodiment of the present invention, the measurement module 501 includes:

a first determining submodule 5011, configured to determine a cyclic prefix CP start time of a data symbol in the PUSCH transmission signal;

the second determining submodule 5012 is configured to obtain the TA adjustment value according to a difference between the determined CP starting time and a CP starting time of a data symbol in a pre-allocated PUSCH resource.

In the apparatus for enhancing non-random access handover according to the embodiment of the present invention, the first determining submodule 5011 includes:

a sampling unit 50111, configured to sample the PUSCH transmission signal to obtain a data symbol;

a selecting unit 50112, configured to select a piece of data with a length equal to the CP length from the sampled data symbols;

the determining unit 50113 is configured to compare the selected piece of data with the sampled data at the tail of the data symbol to obtain the start time of the CP of the data symbol.

a third determining submodule 5013, configured to determine, in the PUSCH transmission signal, a position of a demodulation reference signal DMRS, where a correlation between a DMRS sequence demodulated at the determined position and a DMRS sequence in a PUSCH resource allocated in advance is highest;

and a fourth determining submodule 5014, configured to compare the determined position of the DMRS with the position of the DMRS in the pre-allocated PUSCH resource, to obtain the TA adjustment value.

a fifth determining submodule 5015, configured to determine, in the PUSCH transmission signal, a position of a sounding reference signal SRS, where a correlation between an SRS sequence demodulated at the determined position and an SRS sequence in a PUSCH resource allocated in advance is highest;

a sixth determining submodule 5016, configured to compare the determined position of the SRS with the position of the SRS in the pre-allocated PUSCH resource, to obtain the TA adjustment value.

The enhancing device for non-random access switching of the embodiment of the invention also comprises:

a first expanding module 503, configured to, in a non-random access handover process, if a radio resource control, RRC, connection reconfiguration complete message sent by a terminal is not successfully acquired and the transmission frequency of the RRC connection reconfiguration complete message does not reach a preset maximum retransmission frequency, perform expanding processing on a time window of acquiring resources used for acquiring the RRC connection reconfiguration complete message, and acquire, using the acquired resources after the time window expanding processing, the RRC connection reconfiguration complete message that is retransmitted by the terminal.

In the apparatus for enhancing non-random access handover according to the embodiment of the present invention, the first extension module 503 is configured to perform extension processing on the time window for acquiring the resource according to a corresponding relationship between a preset extension step value and a retransmission number of the RRC connection reconfiguration complete message, where the extension step value increases with an increase in the retransmission number.

a second extension module 504, configured to, in a non-random access handover process, if a radio resource control, RRC, connection reconfiguration complete message sent by a terminal is not successfully acquired and the transmission frequency of the RRC connection reconfiguration complete message does not reach a preset maximum retransmission frequency, perform extension processing on a CP length of a cyclic prefix, which is used to acquire resources of the RRC connection reconfiguration complete message, and acquire, using the acquired resources after CP length extension processing, an RRC connection reconfiguration complete message sent by the terminal using an extended CP.

In the apparatus for enhancing non-random access handover according to the embodiment of the present invention, the second extension module 504 is configured to perform extension processing on the CP length of the acquired resource according to a correspondence between a pre-agreed CP extension length value and the retransmission times of the RRC connection reconfiguration complete message, where the CP extension length value increases with the increase of the retransmission times.

In the enhancing device for non-random access switching of the embodiment of the invention, in the process of non-random access switching, if a Radio Resource Control (RRC) connection reconfiguration completion message sent by a terminal is successfully acquired, a TA (timing advance) adjusting value is measured according to an acquired transmission signal for transmitting the RRC connection reconfiguration completion message; and sending the measured TA adjusting value to the terminal, so that the terminal can adjust the TA measured by the terminal according to the TA adjusting value, the error of the TA of the UE is adjusted, the receiving reliability of the RRC connection reconfiguration completion message is improved, and the receiving reliability of the subsequent uplink transmission data of the UE is improved.

It should be noted that the apparatus for enhancing a non-random access handover is an apparatus corresponding to the method for enhancing a non-random access handover, and all implementation manners in the method embodiments are applicable to the embodiment of the apparatus, so that the same technical effect can be achieved.

Fifth embodiment

As shown in fig. 6, an embodiment of the present invention further provides a base station, including:

a first processor 601, configured to, in a non-random access handover process, if a radio resource control, RRC, connection reconfiguration complete message sent by a terminal is successfully acquired, measure a timing advance TA adjustment value according to an acquired transmission signal used for transmitting the RRC connection reconfiguration complete message;

a first transmitter 602, configured to transmit the measured TA adjustment value to a terminal.

The first processor 601 may also be configured to implement the functions implemented by all the modules in the embodiment of the apparatus for enhancing non-random access handover, and may also achieve the same technical effects as those achieved by the embodiment of the apparatus for enhancing non-random access handover.

Sixth embodiment

As shown in fig. 7, an embodiment of the present invention further provides an enhanced method for non-random access handover, which is applied to a terminal, and includes:

step 701: and in the non-random access switching process, sending a Radio Resource Control (RRC) connection reconfiguration completion message to the base station.

Step 702: and acquiring a TA adjusting value sent by the base station after the RRC connection reconfiguration completing message is successfully acquired, wherein the TA adjusting value is measured by the base station according to a transmission signal for transmitting the RRC connection reconfiguration completing message.

The TA adjustment value is measured according to a PUSCH transmission signal for transmitting the RRC connection reconfiguration complete message after the base station successfully acquires the RRC connection reconfiguration complete message.

Further, in this embodiment of the present invention, after the step of obtaining the TA adjustment value sent by the base station after the RRC connection reconfiguration complete message is successfully obtained, the enhancing method further includes:

and adjusting the TA measured by the terminal according to the TA adjusting value, and sending data according to the adjusted TA.

In the enhancing method of the non-random access switching of the embodiment of the invention, in the process of the non-random access switching, a message for completing the reconfiguration of Radio Resource Control (RRC) connection is sent to a base station; and acquiring a TA adjusting value sent by the base station after the RRC connection reconfiguration finishing message is successfully acquired, adjusting the TA measured by the terminal according to the TA adjusting value, and sending data according to the adjusted TA, thereby ensuring the reliable receiving of subsequent uplink transmission data.

Seventh embodiment

As shown in fig. 8, the method for enhancing non-random access handover according to the embodiment of the present invention is applied to a terminal, and the method includes:

step 801: and in the non-random access switching process, sending a Radio Resource Control (RRC) connection reconfiguration completion message to the base station.

Step 802: and if a feedback message which is returned by the base station and used for indicating that the RRC connection reconfiguration completing message fails to be acquired is acquired, and the transmission times of the RRC connection reconfiguration completing message do not reach the preset maximum retransmission times, retransmitting the RRC connection reconfiguration completing message by adopting an extended Cyclic Prefix (CP).

Specifically, according to a correspondence between a pre-agreed CP extension length value and the number of retransmissions of the RRC connection reconfiguration complete message, the CP length of a transmission signal used for transmitting the RRC connection reconfiguration complete message is extended; and retransmitting the RRC connection reconfiguration completion message by adopting the transmission signal after the CP length expansion processing.

Further, in this embodiment of the present invention, after the step of sending a radio resource control RRC connection reconfiguration complete message to the base station in the non-random access handover process, the enhancing method further includes:

and if a feedback message which is returned by the base station and used for indicating that the RRC connection reconfiguration completing message fails to be obtained is obtained, and the transmission times of the RRC connection reconfiguration completing message reach the preset maximum retransmission times, sending a physical random access channel message header to the base station.

With reference to fig. 9, a detailed description is given of an interaction flow between the terminal and the base station when the RRC connection reconfiguration complete message fails to be acquired and the transmission frequency of the RRC connection reconfiguration complete message reaches the preset maximum retransmission frequency in the embodiment of the present invention.

As shown in fig. 9, the interaction flow includes:

step 901: and the terminal sends an RRC connection reconfiguration completion message to the target base station.

Step 902: and the target base station fails to acquire the RRC connection reconfiguration complete message and sends a feedback message for indicating the failure of acquiring the RRC connection reconfiguration complete message to the terminal.

Step 903: and the target base station adjusts the PUSCH acquisition window.

Step 904: and the transmission times of the RRC connection reconfiguration completing message do not reach the preset maximum retransmission times, and the terminal retransmits the RRC connection reconfiguration completing message.

Step 905: and the target base station does not successfully acquire the RRC connection reconfiguration completing message and sends a feedback message for indicating the failure of acquiring the RRC connection reconfiguration completing message to the terminal.

Step 906: and the transmission times of the RRC connection reconfiguration completion message reach the preset maximum retransmission times, and the PRACH preamble of the physical random access channel message header is sent to the base station.

When the TA calculated by the UE is so large or wrong that the RRC connection reconfiguration complete message transmitted multiple times cannot be correctly acquired by the target base station. Under the condition, the UE sends PRACH preamble for random access.

Eighth embodiment

As shown in fig. 10, an embodiment of the present invention provides an enhanced apparatus 1000 for non-random access handover, which is applied to a terminal, and includes:

a second sending module 1001, configured to send a radio resource control, RRC, connection reconfiguration complete message to the base station in a non-random access handover process;

an obtaining module 1002, configured to obtain a TA adjustment value sent by a base station after the RRC connection reconfiguration complete message is successfully obtained, where the TA adjustment value is obtained by the base station according to measurement of a transmission signal used for transmitting the RRC connection reconfiguration complete message.

an adjusting module 1003, configured to adjust the TA measured by the terminal according to the TA adjustment value, and send data according to the adjusted TA.

a resending module 1004, configured to resend the RRC connection reconfiguration complete message by using an extended cyclic prefix CP if a feedback message returned by the base station and used to indicate that the RRC connection reconfiguration complete message fails to be obtained is obtained and the transmission frequency of the RRC connection reconfiguration complete message does not reach a preset maximum retransmission frequency.

In the apparatus for enhancing non-random access handover according to the embodiment of the present invention, the resending module 1004 includes:

an extension sub-module 10041, configured to perform extension processing on the CP length of the transmission signal used for transmitting the RRC connection reconfiguration complete message according to a correspondence between a pre-agreed CP extension length value and the retransmission times of the RRC connection reconfiguration complete message;

the sending sub-module 10042 is configured to resend the RRC connection reconfiguration complete message by using the transmission signal after the CP length extension processing.

a third sending module 1005, configured to send a physical random access channel packet header to the base station if a feedback message returned by the base station and used to indicate that the RRC connection reconfiguration complete message acquisition fails is obtained and the transmission frequency of the RRC connection reconfiguration complete message reaches a preset maximum retransmission frequency.

In the enhancing device for non-random access switching of the embodiment of the invention, in the non-random access switching process, a Radio Resource Control (RRC) connection reconfiguration completion message is sent to a base station; and acquiring a TA adjusting value sent by the base station after the RRC connection reconfiguration finishing message is successfully acquired, adjusting the TA measured by the terminal according to the TA adjusting value, and sending data according to the adjusted TA, thereby ensuring the reliable receiving of subsequent uplink transmission data.

Ninth embodiment

As shown in fig. 11, an embodiment of the present invention further provides a terminal, including:

a second transmitter 1101, configured to send a radio resource control, RRC, connection reconfiguration complete message to the base station in a non-random access handover process;

a receiver 1102, configured to acquire a TA adjustment value sent by the base station after the RRC connection reconfiguration complete message is successfully acquired, where the TA adjustment value is measured by the base station according to a transmission signal used for transmitting the RRC connection reconfiguration complete message.

The terminal of the embodiment of the present invention may further include a processor, and the processor may be configured to implement the functions implemented by all the modules in the embodiment of the enhancing apparatus for non-random access handover, and may also achieve the same technical effects as those achieved by the embodiment of the enhancing apparatus for non-random access handover.

The terminal described in the embodiments of the present invention may be a mobile phone (or a mobile phone), or other devices capable of sending or receiving wireless signals, including a user equipment (terminal), a Personal Digital Assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a Wireless Local Loop (WLL) station, a CPE or Mifi capable of converting a mobile signal into a wifi signal, an intelligent appliance, or other devices capable of autonomously communicating with a mobile communication network without human operation, and the like.

Furthermore, it is to be noted that in the device and method of the invention, it is obvious that the individual components or steps can be decomposed and/or recombined. These decompositions and/or recombinations are to be regarded as equivalents of the present invention. Also, the steps of performing the series of processes described above may naturally be performed chronologically in the order described, but need not necessarily be performed chronologically, and some steps may be performed in parallel or independently of each other. It will be understood by those skilled in the art that all or any of the steps or elements of the method and apparatus of the present invention may be implemented in any computing device (including processors, storage media, etc.) or network of computing devices, in hardware, firmware, software, or any combination thereof, which can be implemented by those skilled in the art using their basic programming skills after reading the description of the present invention.

Thus, the objects of the invention may also be achieved by running a program or a set of programs on any computing device. The computing device may be a general purpose device as is well known. The object of the invention is thus also achieved solely by providing a program product comprising program code for implementing the method or the apparatus. That is, such a program product also constitutes the present invention, and a storage medium storing such a program product also constitutes the present invention. It is to be understood that the storage medium may be any known storage medium or any storage medium developed in the future. It is further noted that in the apparatus and method of the present invention, it is apparent that each component or step can be decomposed and/or recombined. These decompositions and/or recombinations are to be regarded as equivalents of the present invention. Also, the steps of executing the series of processes described above may naturally be executed chronologically in the order described, but need not necessarily be executed chronologically. Some steps may be performed in parallel or independently of each other.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

A1. A method for enhancing non-random access handover is applied to a base station, and is characterized by comprising the following steps:

and sending the measured TA adjusting value to the terminal.

A2. The method for enhancing non-random access handover according to a1, wherein the step of measuring a timing advance TA adjustment value according to the acquired transmission signal for transmitting the RRC connection reconfiguration complete message includes:

and measuring the TA adjusting value according to the acquired Physical Uplink Shared Channel (PUSCH) transmission signal used for transmitting the RRC connection reconfiguration completion message.

A3. The method for enhancing non-random access handover according to a2, wherein the step of measuring the TA adjustment value according to the acquired PUSCH transmission signal for transmitting the RRC connection reconfiguration complete message includes:

determining a Cyclic Prefix (CP) starting time of a data symbol in the PUSCH transmission signal;

and obtaining the TA adjusting value according to the difference value between the determined CP starting time and the CP starting time of the data symbols in the pre-allocated PUSCH resources.

A4. The method for enhancing non-random access handover as claimed in a3, wherein the step of determining the CP start time of a data symbol in the PUSCH transmission signal comprises:

sampling the PUSCH transmission signal to obtain a data symbol;

selecting a section of data with the length same as that of the CP from the sampled data symbols;

and comparing the selected section of data with the sampled data at the tail part of the data symbol to obtain the starting time of the CP of the data symbol.

A5. The method for enhancing non-random access handover according to a2, wherein the step of measuring the TA adjustment value according to the acquired PUSCH transmission signal for transmitting the RRC connection reconfiguration complete message includes:

determining the position of a demodulation reference signal (DMRS) in the PUSCH transmission signal, wherein the correlation degree of the DMRS sequence demodulated at the determined position and the DMRS sequence in the pre-allocated PUSCH resource is the highest;

and comparing the determined position of the DMRS with the position of the DMRS in the pre-allocated PUSCH resource to obtain the TA adjusting value.

A6. The method for enhancing non-random access handover according to a2, wherein the step of measuring the TA adjustment value according to the acquired PUSCH transmission signal for transmitting the RRC connection reconfiguration complete message includes:

determining the position of a Sounding Reference Signal (SRS) in the PUSCH transmission signal, wherein the correlation degree between an SRS sequence demodulated at the determined position and an SRS sequence in a pre-allocated PUSCH resource is the highest;

and comparing the determined position of the SRS with the position of the SRS in the pre-allocated PUSCH resource to obtain the TA adjusting value.

A7. The method for enhancing non-random access handover as defined in a1, wherein the method further comprises:

in the non-random access switching process, if a Radio Resource Control (RRC) connection reconfiguration complete message sent by a terminal is not successfully acquired and the transmission frequency of the RRC connection reconfiguration complete message does not reach a preset maximum retransmission frequency, performing expansion processing on a time window of acquiring resources for acquiring the RRC connection reconfiguration complete message, and acquiring the RRC connection reconfiguration complete message sent by the terminal again by using the acquired resources after the time window expansion processing.

A8. The method for enhancing non-random access handover as defined in a7, wherein the step of expanding the time window for acquiring the acquisition resource of the RRC connection reconfiguration complete message includes:

and performing expansion processing on the time window of the acquired resource according to the corresponding relation between a preset expansion step value and the retransmission times of the RRC connection reconfiguration completion message, wherein the expansion step value is increased along with the increase of the retransmission times.

A9. The method for enhancing non-random access handover as defined in a1, wherein the method further comprises:

in the non-random access switching process, if a Radio Resource Control (RRC) connection reconfiguration complete message sent by a terminal is not successfully acquired and the transmission frequency of the RRC connection reconfiguration complete message does not reach the preset maximum retransmission frequency, the CP length of the Cyclic Prefix (CP) of the acquired resource for acquiring the RRC connection reconfiguration complete message is subjected to expansion processing, and the acquired resource after CP length expansion processing is used for acquiring the RRC connection reconfiguration complete message sent by the terminal by adopting an expanded CP.

A10. The method for enhancing a non-random access handover as defined in a9, wherein the step of extending the CP length of the acquired resource comprises:

and according to the corresponding relation between the pre-agreed CP extension length value and the retransmission times of the RRC connection reconfiguration completion message, carrying out extension processing on the CP length of the acquired resource, wherein the CP extension length value is increased along with the increase of the retransmission times.

B11. An apparatus for enhancing non-random access handover, applied to a base station, comprising:

B12. The apparatus for enhancing non-random access handover according to B11, wherein the measuring module is configured to measure the TA adjustment value according to the obtained PUSCH transmission signal for transmitting the RRC connection reconfiguration complete message.

B13. The apparatus for enhancing non-random access handover of B12, wherein the measuring module comprises:

a first determining submodule, configured to determine a Cyclic Prefix (CP) start time of a data symbol in the PUSCH transmission signal;

and the second determining submodule is used for obtaining the TA adjusting value according to the difference value between the determined CP starting time and the CP starting time of the data symbols in the pre-allocated PUSCH resources.

B14. The apparatus for enhancing non-random access handover of B13, wherein the first determining sub-module comprises:

the sampling unit is used for sampling the PUSCH transmission signal to obtain a data symbol;

a selecting unit, configured to select a piece of data with a length equal to that of the CP from the sampled data symbols;

and the determining unit is used for comparing the selected section of data with the sampled data at the tail part of the data symbol to obtain the starting time of the CP of the data symbol.

B15. The apparatus for enhancing non-random access handover of B12, wherein the measuring module comprises:

a third determining submodule, configured to determine, in the PUSCH transmission signal, a position of a demodulation reference signal DMRS, where a correlation between a DMRS sequence demodulated at the determined position and a DMRS sequence in a pre-allocated PUSCH resource is highest;

and the fourth determining submodule is used for comparing the determined position of the DMRS with the position of the DMRS in the pre-allocated PUSCH resource to obtain the TA adjusting value.

B16. The apparatus for enhancing non-random access handover of B12, wherein the measuring module comprises:

a fifth determining submodule, configured to determine, in the PUSCH transmission signal, a position of a sounding reference signal SRS, where a correlation between an SRS sequence demodulated at the determined position and an SRS sequence in a PUSCH resource allocated in advance is highest;

and a sixth determining submodule, configured to compare the determined position of the SRS with a position of the SRS in the pre-allocated PUSCH resource, to obtain the TA adjustment value.

B17. The apparatus for enhancing non-random access handover according to B11, further comprising:

the first expansion module is configured to, in a non-random access handover process, if a radio resource control, RRC, connection reconfiguration complete message sent by a terminal is not successfully acquired and the transmission frequency of the RRC connection reconfiguration complete message does not reach a preset maximum retransmission frequency, perform expansion processing on a time window of an acquisition resource used for acquiring the RRC connection reconfiguration complete message, and acquire the RRC connection reconfiguration complete message retransmitted by the terminal using the acquisition resource after the time window expansion processing.

B18. The apparatus for enhancing a non-random access handover according to B17, wherein the first extension module is configured to perform extension processing on the time window for acquiring the resource according to a correspondence between a preset extension step value and a retransmission number of the RRC connection reconfiguration complete message, and the extension step value increases with an increase in the retransmission number.

B19. The apparatus for enhancing non-random access handover according to B11, further comprising:

and the second expansion module is used for expanding the CP length of the acquired resources for acquiring the RRC connection reconfiguration completion message and acquiring the RRC connection reconfiguration completion message sent by the terminal by using the acquired resources after CP length expansion if the RRC connection reconfiguration completion message sent by the terminal is not successfully acquired and the transmission frequency of the RRC connection reconfiguration completion message does not reach the preset maximum retransmission frequency in the non-random access switching process.

B20. The apparatus for enhancing a non-random access handover according to B19, wherein the second extension module is configured to perform an extension process on the CP length of the acquired resource according to a correspondence between a pre-agreed CP extension length value and the retransmission times of the RRC connection reconfiguration complete message, where the CP extension length value increases with an increase in the retransmission times.

C21. A base station, comprising:

D22. A method for enhancing non-random access switching is applied to a terminal, and is characterized by comprising the following steps:

D23. The method for enhancing non-random access handover according to D22, wherein after the step of obtaining the TA adjustment value sent by the base station after successfully obtaining the RRC connection reconfiguration complete message, the method further comprises:

D24. The method for enhancing non-random access handover as recited in D22, wherein after the step of sending a RRC connection reconfiguration complete message to the base station during the non-random access handover, the method further comprises:

and if a feedback message which is returned by the base station and used for indicating that the RRC connection reconfiguration completing message fails to be acquired is acquired, and the transmission times of the RRC connection reconfiguration completing message do not reach the preset maximum retransmission times, retransmitting the RRC connection reconfiguration completing message by adopting an extended Cyclic Prefix (CP).

D25. The method for enhancing non-random access handover as recited in D24, wherein the re-sending the RRC connection reconfiguration complete message with an extended cyclic prefix CP comprises:

according to the corresponding relation between the pre-agreed CP extension length value and the retransmission times of the RRC connection reconfiguration completion message, the CP length of a transmission signal for transmitting the RRC connection reconfiguration completion message is subjected to extension processing;

and retransmitting the RRC connection reconfiguration completion message by adopting the transmission signal after the CP length expansion processing.

D26. The method for enhancing non-random access handover as recited in D22, wherein after the step of sending a RRC connection reconfiguration complete message to the base station during the non-random access handover, the method further comprises:

E27. An apparatus for enhancing non-random access handover, applied to a terminal, comprising:

E28. The apparatus for enhancing non-random access handover according to E27, further comprising:

and the adjusting module is used for adjusting the TA measured by the terminal according to the TA adjusting value and sending data according to the adjusted TA.

E29. The apparatus for enhancing non-random access handover according to E27, further comprising:

and a resending module, configured to resend the RRC connection reconfiguration complete message by using an extended cyclic prefix CP if a feedback message, which is returned by the base station and used to indicate that the RRC connection reconfiguration complete message fails to be obtained and the transmission frequency of the RRC connection reconfiguration complete message does not reach a preset maximum retransmission frequency, is obtained.

E30. The apparatus for enhancing non-random access handover as recited in E29, wherein the retransmission module comprises:

the expanding submodule is used for expanding the CP length of a transmission signal for transmitting the RRC connection reconfiguration completion message according to the corresponding relation between the pre-agreed CP expanding length value and the retransmission times of the RRC connection reconfiguration completion message;

and the sending submodule is used for sending the RRC connection reconfiguration completion message again by adopting the transmission signal after the CP length expansion processing.

E31. The apparatus for enhancing non-random access handover according to E27, further comprising:

and a third sending module, configured to send a physical random access channel header to the base station if a feedback message returned by the base station and used to indicate that the RRC connection reconfiguration complete message fails to be obtained is obtained and the transmission frequency of the RRC connection reconfiguration complete message reaches a preset maximum retransmission frequency.

F32. A terminal, comprising:

and the receiver is used for acquiring a TA adjusting value sent by the base station after the base station successfully receives the RRC connection reconfiguration complete message, wherein the TA adjusting value is obtained by the base station according to measurement of a transmission signal for transmitting the RRC connection reconfiguration complete message.

Claims

1. A method for enhancing non-random access handover is applied to a base station, and is characterized by comprising the following steps:

sending the measured TA adjusting value to the terminal;

the TA adjustment value is used for adjusting the TA calculated by the terminal.

2. The method according to claim 1, wherein the step of measuring a TA adjustment value according to the acquired transmission signal for transmitting the RRC connection reconfiguration complete message comprises:

3. The method according to claim 2, wherein the step of measuring the TA adjustment value according to the acquired PUSCH transmission signal for transmitting the RRC connection reconfiguration complete message comprises:

4. The enhanced method of non-random access handover according to claim 3, wherein the step of determining a Cyclic Prefix (CP) start time of a data symbol in the PUSCH transmission signal comprises:

sampling the PUSCH transmission signal to obtain a data symbol;

5. The method according to claim 2, wherein the step of measuring the TA adjustment value according to the acquired PUSCH transmission signal for transmitting the RRC connection reconfiguration complete message comprises:

6. The method according to claim 2, wherein the step of measuring the TA adjustment value according to the acquired PUSCH transmission signal for transmitting the RRC connection reconfiguration complete message comprises:

7. The enhanced method for non-random access handover as recited in claim 1, wherein the enhanced method further comprises:

8. The method of claim 7, wherein the step of expanding the time window for acquiring the acquisition resources of the RRC connection reconfiguration complete message comprises:

9. The enhanced method for non-random access handover as recited in claim 1, wherein the enhanced method further comprises:

10. The method of claim 9, wherein the step of extending the CP length of the acquired resource comprises:

11. An apparatus for enhancing non-random access handover, applied to a base station, comprising:

a first sending module, configured to send the measured TA adjustment value to a terminal;

12. The apparatus according to claim 11, wherein the measuring module is configured to measure the TA adjustment value according to an acquired physical uplink shared channel, PUSCH, transmission signal used for transmitting the RRC connection reconfiguration complete message.

13. The apparatus of claim 12, wherein the measurement module comprises:

14. The apparatus of claim 13, wherein the first determining submodule comprises:

15. The apparatus of claim 12, wherein the measurement module comprises:

16. The apparatus of claim 12, wherein the measurement module comprises:

17. The apparatus of claim 11, further comprising:

the first expansion module is configured to, in a non-random access handover process, if a radio resource control, RRC, connection reconfiguration complete message sent by a terminal is not successfully acquired and the transmission frequency of the RRC connection reconfiguration complete message does not reach a preset maximum retransmission frequency, perform expansion processing on a time window of acquiring resources used for acquiring the RRC connection reconfiguration complete message, and acquire, using the acquired resources after the time window expansion processing, the RRC connection reconfiguration complete message that is retransmitted by the terminal.

18. The apparatus of claim 17, wherein the first extension module is configured to perform extension processing on the time window for acquiring resources according to a corresponding relationship between a preset extension step value and a retransmission number of the RRC connection reconfiguration complete message, wherein the extension step value increases with an increase of the retransmission number.

19. The apparatus of claim 11, further comprising:

20. The apparatus of claim 19, wherein the second extension module is configured to perform extension processing on the CP length of the acquired resource according to a correspondence between a pre-agreed CP extension length value and a retransmission number of the RRC connection reconfiguration complete message, wherein the CP extension length value increases with an increase in the retransmission number.

21. A base station, comprising:

a first transmitter for transmitting the measured TA adjustment value to the terminal;

22. A method for enhancing non-random access switching is applied to a terminal, and is characterized by comprising the following steps:

acquiring a TA (timing advance) adjustment value sent by a base station after the RRC connection reconfiguration completion message is successfully acquired, wherein the TA adjustment value is obtained by the base station according to measurement of a transmission signal for transmitting the RRC connection reconfiguration completion message;

23. The method of claim 22, wherein after the step of obtaining the TA adjustment value sent by the base station after successfully obtaining the RRC connection reconfiguration complete message, the method further comprises:

24. The method of claim 22, wherein after the step of sending a RRC connection reconfiguration complete message to the base station during the non-random access handover, the method further comprises:

25. The method of claim 24, wherein the retransmitting the RRC connection reconfiguration complete message with an extended Cyclic Prefix (CP) comprises:

26. The method of claim 22, wherein after the step of sending a RRC connection reconfiguration complete message to the base station during the non-random access handover, the method further comprises:

27. An apparatus for enhancing non-random access handover, applied to a terminal, comprising:

an obtaining module, configured to obtain a TA adjustment value sent by a base station after the RRC connection reconfiguration complete message is successfully obtained by the base station, where the TA adjustment value is obtained by the base station according to measurement of a transmission signal used for transmitting the RRC connection reconfiguration complete message;

28. The apparatus for enhancing non-random access handover as recited in claim 27, further comprising:

29. The apparatus for enhancing non-random access handover as recited in claim 27, further comprising:

30. The apparatus of claim 29, wherein the retransmission module comprises:

31. The apparatus for enhancing non-random access handover as recited in claim 27, further comprising:

32. A terminal, comprising:

a receiver, configured to obtain a TA adjustment value sent by a base station after the base station successfully obtains the RRC connection reconfiguration complete message, where the TA adjustment value is obtained by the base station according to measurement of a transmission signal used for transmitting the RRC connection reconfiguration complete message;