WO2010075758A1

WO2010075758A1 - Uplink detection method, uplink synchronization method for lte, apparatus and system thereof

Info

Publication number: WO2010075758A1
Application number: PCT/CN2009/076124
Authority: WO
Inventors: 李彬; 郭燕鹏; 朱磊; 郝珅
Original assignee: 华为技术有限公司
Priority date: 2008-12-31
Filing date: 2009-12-28
Publication date: 2010-07-08
Also published as: CN101854646B; CN101854646A

Abstract

An uplink detection method, an uplink synchronization method for LTE, an apparatus and a system thereof are provided. The uplink detection method for LTE includes the following steps: receiving an access preamble sequence from a user equipment UE, and correlating the access preamble sequence with a local sequence (81); calculating Round-Trip Delay RTD according to the correlation peak value obtained through the correlation, and calculating a Timing Alignment TA value (82); subtracting a predetermined value from the TA value to obtain a target TA value, and transmitting the target TA value to the user equipment with TA signaling for adjusting time offset (83). The above solution enables the data, which may arrive at eNodeB ahead of time originally, to be transmitted behind time by subtracting the predetermined value from the TA value, thereby reducing the probability of arriving ahead of time of the data sent by UE, and reducing the probability of bringing out Intersymbol Interference, thus reducing the Bit Error Rate.

Description

LTE uplink detection method, uplink synchronization method, device and system

This application is submitted to the Chinese Patent Office on December 31, 2008, application number 200810186598.2, and the invention name is "random access channel detection method, uplink synchronization method, device and system", and submitted to China on September 10, 2009. The Patent Office, Application No. 200910161968., entitled " LTE Uplink Detection Method, Uplink Synchronization Method, Apparatus, and System", the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD The present invention relates to the field of communications technologies, and in particular, to an LTE uplink detection method, an uplink synchronization method, apparatus, and system. BACKGROUND OF THE INVENTION Long Term Evolution (LTE) is a broadband wireless technology standard proposed by the 3rd Generation Partnership Project (3GPP), which is a high data rate, low latency, and full packet based. Mobile communication system standard.

In the LTE system, the random access technology is a very important technology, and the normal data interaction between the user equipment (UE) and the evolved base station (eNodeB) must be randomly accessed. The random access procedure generally occurs when the uplink timing synchronization of the UE is not aligned. Generally, this situation often occurs when the UE just enters the cell, or the UE misses the uplink synchronization tracking. Therefore, in the random access process, the network side mainly performs two tasks: establishing uplink time synchronization of the UE and the eNodeB, and completing initial access of the UE.

In an existing LTE system uplink, for example, the RACH detection method, the eNodeB receives an access preamble sequence (preamble sequence) sent by the UE, and the preamble sequence structure is as shown in FIG. 1, and includes a cyclic prefix (CP, Cycle Prefix) and a sequence. Part, the CP is obtained by taking the second half of the Sequence (shown in the shaded part of the figure). Then, the eNodeB calculates a corresponding timing calibration (TA, Timing Alignment), and sends the TA value to the UE in a signaling (TA signaling) manner.

After receiving the TA signaling, the UE may adjust the sending time of the service data according to the TA value, so that the UE and the eNodeB synchronize.

In carrying out the creation of the present invention, the inventors discovered that since the LTE system is usually based on positive A system of OFDM (Orthogonal Frequency Division Multiplex) has OFDM-related characteristics. When the time-shift variation is greater than 0 and less than a predetermined value, if the OFDM symbol leads the eNodeB, it will cause a fast Fourier transform ( FFT) The integration window contains both the partial samples of the current OFDM symbol and the partial samples of the next OFDM symbol CP, which causes inter-symbol interference (ISI, InterSymbol Interference), resulting in an increase in bit error rate. SUMMARY OF THE INVENTION Embodiments of the present invention provide a long term evolution system LTE uplink detection method, an uplink synchronization method, apparatus, and system.

A long-term evolution system uplink detection method includes:

Receiving an access preamble sequence from the user equipment, and associating the access preamble sequence with a local sequence, where the access preamble sequence is a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence;

Calculating a round-trip delay RTD according to the correlation peak obtained by correlation, and calculating a timing calibration TA value; subtracting the TA value by a predetermined value to obtain a target TA value, and transmitting the target TA value to the The user equipment is used to adjust the time offset.

A method for uplink synchronization of a long term evolution system, comprising:

Sending an access preamble sequence to the network side, where the access preamble sequence is a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence;

Receiving, by the network side, the TA signaling that includes the timing calibration TA value, where the TA value is calculated by the network side according to the access preamble sequence and its local sequence;

The TA value is subtracted from the predetermined value to obtain the target TA value, and the time offset is adjusted according to the target TA value to achieve synchronization with the network side.

An uplink detecting device includes:

a correlation unit, configured to associate an access preamble sequence from the user equipment with a local sequence, where the access preamble sequence is a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence;

The first calculating unit calculates a round-trip delay RTD according to the correlation peak obtained by the correlation, and calculates a timing calibration TA value; a second calculating unit, the TA value is subtracted from the predetermined value to obtain a target TA value; the sending unit is configured to send the target TA value to the user equipment, where the target TA value is adjusted by the user equipment Benchmark.

A base station comprising the above-described uplink detecting means.

An uplink synchronization device includes:

The access preamble sending unit is configured to send an access preamble sequence, where the access preamble sequence is a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence;

a timing calibration value receiving unit, configured to receive a timing calibration TA value sent by the network side, where the TA value is calculated by the network side according to the access preamble sequence and its local sequence;

a timing calibration value processing unit, configured to subtract the predetermined value from the TA value to obtain a target TA value, and a time offset adjustment unit configured to adjust a time offset according to the target TA value to implement synchronization with the network side, and a user terminal, The user terminal includes the above uplink synchronization device:

A communication system comprising:

a base station, configured to correlate an access preamble sequence from the user equipment with a local sequence, calculate a round trip delay RTD and a timing calibration TA value, subtract the predetermined value from the TA value to obtain a target TA value, and The target TA value is sent to the user equipment.

A communication system comprising:

a user equipment, configured to send an access preamble sequence, where the access preamble sequence includes a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence; and receiving a TA value sent by the base station, and subtracting the TA value The predetermined value obtains the target TA value, and the time offset is adjusted according to the target TA value to achieve uplink synchronization with the base station.

The embodiment of the present invention reduces the probability that the data sent by the UE advances to the eNodeB, and reduces the probability of causing crosstalk between symbols, thereby reducing the bit error rate by subtracting the predetermined value from the TA value, so that the data that may be advanced to the eNodeB is delayed. . BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, obviously, in the following description The drawings are only some embodiments of the invention, and will not be paid by one of ordinary skill in the art Other drawings can also be obtained from these drawings on the premise of inventive labor. 1 is a schematic structural view of a preamble sequence;

2 is a flowchart of an uplink detection method according to an embodiment of the present invention;

3 is a schematic diagram of the OFDM symbol leading, punctual, and lag arriving at the eNodeB;

4 is a schematic diagram of OFDM reaching an eNodeB when the lag time is the maximum time allowed in the embodiment of the present invention;

FIG. 5 is a flowchart of a method for implementing uplink synchronization according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an uplink detection apparatus according to an embodiment of the present invention; FIG. 7 is a schematic structural diagram of an uplink synchronization apparatus according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a basic process of a long-term evolution system uplink detection method according to an embodiment of the present invention;

FIG. 9 is a schematic flowchart of a method for uplink synchronization of a long term evolution system according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 11 is a schematic diagram of a basic structure of a terminal according to an embodiment of the present invention. The embodiments of the present invention provide a RACH detection method, an uplink synchronization method, an apparatus, and a system, so as to prevent data sent by a UE from reaching the eNodeB and causing crosstalk between symbols.

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

Referring to FIG. 2, a flow chart of a method for detecting a random access channel according to an embodiment of the present invention includes the following steps:

Step S21: Correlate the Preamble sequence from the UE with a local sequence.

Receiving a Preamble sequence sent by the UE, where the Preamble sequence may be randomly selected by the UE in a sequence family of cells according to requirements.

Step S22: Calculate an RTD (Round Trip Delay) according to the correlation peak obtained by the correlation. Return delay), and calculate the TA value according to the RTD.

Specifically, how to calculate the RTD and the TA value can be done by the methods provided by the prior art, and will not be described in detail herein.

Step S23: Subtracting the calculated TA value by a predetermined value to obtain a target TA value, and transmitting the target TA value to the UE.

The predetermined value is based on the test statistics and meets certain conditions, and can also be adjusted according to the actual operation of the network.

The target TA value is a reference for adjusting the time offset of the UE, and the UE adjusts the time offset by using the target TA value to implement uplink synchronization with the eNodeB, and then sends data to the eNodeB.

It should be noted that, in the above step S22, the TA value is obtained according to the TA algorithm, and the calculated TA value generally has a certain error X with the actual value, and the range of X is usually (-ΔΤΑ, ΔΤΑ), where ΔΤΑ is the TA letter. The minimum granularity of the order is generally determined based on the multipath tolerance, TA signaling, and time overhead of the eNodeB receiver.

If X is in the interval of (-ΔΤΑ, 0), the data sent by the UE lags to the eNodeB. As shown in Figure 3, the timing reference is in the CP range, so the OFDM window that performs fast Fourier transform integration contains the current symbol and its cyclic shift. The sample value does not cause ISI; if X is in the (0, ΔΤΑ) interval, the OFDM symbol leads to the eNodeB, and the timing reference exceeds the range of the CP, the FFT integration window contains both the partial samples of the current OFDM symbol. It also contains partial samples of the next OFDM symbol CP, which causes ISI, resulting in an increase in bit error rate.

Therefore, in this embodiment, after the TA value is obtained according to the algorithm, the calculated TA value is subtracted by a predetermined value, and the predetermined value is greater than or equal to ΔΤΑ, and the specific value may be as follows: The UE can be adjusted based on the target TA value. When the data symbol transmitted after the time offset arrives at the eNodeB, the left edge of the OFDM window in which the eNodeB acquires the symbol is within the CP range of the symbol. In other words, the data symbols transmitted by the UE can be made to arrive at the eNodeB on time or lag.

Assuming that the maximum time of the lag is T1, when the data symbol sent by the UE arrives at the eNodeB, the left edge of the OFDM window of the eNodeB acquiring the symbol is at the demarcation point between the CP of the current data symbol and the previous data symbol, as shown in FIG.

The following is an example with a predetermined value equal to Δ: The error X between the TA value obtained by the algorithm and the actual TA value is any value between (-ΔΤΑ, ΔΤΑ), and the range of the difference between the obtained target TA value and the actual TA value after subtracting ΔΤΑ It is (-2ΔΤΑ, 0), so that the data that may be ahead of the eNodeB in the (0, ΔΤΑ) interval can be guaranteed to arrive on time or lag, ensuring that the OFDM window with FFT integration contains only one OFDM symbol sample. Therefore, crosstalk between symbols is not caused, and the bit error rate is lowered.

The embodiment of the present invention further discloses a method for implementing uplink synchronization. In the method, after the eNodeB calculates the TA value, the eNodeB sends the value to the UE, and after the UE obtains the TA value, the TA value is subtracted from the predetermined value. To achieve uplink synchronization with the eNodeB. The specific process is as shown in FIG. 5, and includes the following steps: Step S51: Send a Preamble sequence to the eNodeB.

The UE randomly selects a Preamble sequence in the sequence family of the cell, and processes and adds the CP to the eNodeB. The eNodeB receives the Preamble sequence, removes the CP, processes it, and correlates with the local sequence, calculates an RTD value according to the correlation peak obtained by the correlation result, and calculates a corresponding TA value, and then sends the TA value to the UE through TA signaling. .

Step S53: Subtracting the received TA value by a predetermined value to obtain a target TA value.

The predetermined value is obtained according to the test statistics, and can be adjusted according to the actual operation of the network. The related description of the predetermined value can refer to the content of the random access channel detection method part.

Step S54: Adjust the time offset by using the target TA value to implement uplink synchronization with the eNodeB. After adjusting the time offset by using the target TA value, it can be considered that the UE and the eNodeB are synchronized, and subsequent data can be sent on this basis.

It should be noted that, in another optional embodiment, the eNodeB may also subtract the calculated TA value from the predetermined value after calculating the TA value, and then obtain the adjusted result, that is, the adjusted TA. The value is sent to the UE. That is to say, after obtaining the adjusted TA value, the UE can determine the TA value as the target TA value, and adjust the time offset according to the target TA value to achieve synchronization with the eNodeB.

It can be seen that the embodiment of the present invention subtracts a predetermined value on the basis of the original TA value (that is, the TA value directly calculated according to the RTD value), so that the time offset of the TA can be changed to 0 to the pre- When the time interval between the values is set, the data sent by the UE advances to the eNodeB, and the probability that the data sent by the UE advances to the eNodeB is reduced as a whole, thereby reducing the probability of causing crosstalk between symbols and reducing the bit error rate.

An embodiment of the present invention discloses an uplink detection apparatus. The structure of the apparatus is as shown in FIG. 6, and includes: a correlation unit 61, a first calculation unit 62, a second calculation unit 63, and a transmission unit 64.

among them:

The correlation unit 61 is configured to correlate the random access channel sequence from the UE with the local sequence, and the specific method for performing correlation belongs to the prior art, and the description is not provided herein.

The first calculating unit 62 is configured to calculate an RTD value according to the correlation peak obtained by the correlation, and calculate a TA value according to the correlation.

The second calculating unit 63 is configured to subtract the predetermined value from the calculated TA value to obtain a target TA value.

The TA sending unit 64 is configured to send the target TA value to the UE.

The target TA value is a reference for the UE to adjust the time offset. After the UE obtains the target TA value, the UE may adjust the time offset according to the target TA value, and subsequent data transmission to the eNodeB is performed on the basis of the adjustment.

The uplink detection apparatus disclosed in the embodiment of the present invention may be configured on the eNodeB, so that the eNodeB has the function of adjusting the TA value, so that the local timing is equal to or ahead of the UE timing (that is, the data sent by the UE arrives on the eNodeB on time or lag. Therefore, the data sent by the UE is prevented from reaching the eNodeB in advance, thereby ensuring that the OFDM window for performing FFT integration contains a sample of a symbol, so that crosstalk between symbols is not caused, and the bit error rate is reduced.

It should be noted that the eNodeB including the uplink detecting apparatus also belongs to the protection scope of the present invention.

The embodiment of the present invention further provides an uplink synchronization apparatus, and the structure thereof is as shown in FIG. 7, and includes: a random access channel sequence sending unit 71, a timing calibration value receiving unit 72, a timing calibration value processing unit 73, and an adjusting unit 74. among them: The random access channel sequence sending unit 71 is configured to send a Preamble sequence.

The timing calibration value receiving unit 72 is configured to receive a timing calibration TA value sent by the eNodeB. The calculation process is as follows: The eNodeB receives the Preamble sequence, removes the CP, processes it, and correlates with the local sequence, and calculates an RTD value according to the correlation peak obtained by the correlation result, and calculates the corresponding TA value. It is then sent to the UE through TA signaling.

The timing calibration value processing unit 73 is configured to subtract the predetermined value from the received TA value to obtain a target TA value.

Time offset adjustment unit 74. It is used to adjust the time offset according to the target TA value to achieve synchronization with the eNodeB.

The uplink synchronization apparatus in this embodiment may be configured on the UE, so that the UE can adjust the TA value to implement uplink synchronization with the eNodeB. It should be noted that the "synchronization" described herein refers to the relative synchronization. In fact, after the above adjustment, the UE and the eNodeB may still not be absolutely synchronized, but at least the probability that the data sent by the UE advances to the eNodeB may be reduced. , thereby reducing the probability of causing crosstalk between symbols and reducing the bit error rate.

It should be noted that the UE having the apparatus for implementing uplink synchronization also belongs to the protection scope of the present invention. In addition, the embodiment of the present invention further discloses a communication system, including an eNodeB and a UE, where: an eNodeB is configured to correlate a Preamble sequence from the UE with a local sequence, and calculate an RTD according to the correlation peak obtained by the correlation, and calculate the RTD according to the correlation. After the TA value is periodically calibrated, the TA value is subtracted by a predetermined value to obtain a target TA value, and the target TA value is transmitted.

The UE is configured to adjust the time offset according to the target TA value to implement uplink synchronization with the eNodeB. Specifically, the eNodeB may include an uplink detecting apparatus as shown in FIG. 6.

In addition, the embodiment of the present invention further discloses another communication system, including an eNodeB and a UE, where: the eNodeB is configured to: correlate a Preamble sequence from the UE with a local sequence, and calculate an RTD according to the correlation peak obtained by the correlation, and calculate according to the After timing calibration of the TA value, it is sent to the UE. The UE is configured to: after obtaining the TA value, subtract the predetermined value from the threshold value to obtain a target threshold, and adjust the time offset according to the target threshold to implement uplink synchronization with the eNodeB.

Specifically, the foregoing UE may include an uplink synchronization apparatus as shown in FIG. 7.

Referring to FIG. 8, a basic flow chart of a long-term evolution system uplink detection method according to an embodiment of the present invention is provided. The embodiment shown in FIG. 8 can be applied to other access preamble sequences, for example, a Physical Uplink Shared Channel (PUSCH) sequence, in addition to a Physical Random Access Channel (PRACH) sequence. Or the SRS (Sounding Reference Signal) sequence, the basic process includes:

Step S81: Receive an access preamble sequence from the UE, and associate the access preamble sequence with a local sequence, where the access preamble sequence is a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence.

Step S82, calculating a round trip delay RTD according to the correlation peak obtained by correlation, and calculating a timing calibration TA value.

Step S83, the TA value is subtracted from the predetermined value to obtain a target TA value, and the target TA value is sent to the UE by TA signaling to adjust the time offset.

In this embodiment, the predetermined value may be the minimum granularity ΔΤΑ of the TA signaling.

Considering various uncertainties of the wireless channel, the error X of the ΤΑ value obtained according to the ΤΑ algorithm in the above step S82 and the actual timing calibration TA' value may be several minimum granularities ΔΤΑ or several minimum granularities ΔΤΑ plus less than one minimum The granularity ΔΤΑ, ie, the error X of the ΤΑ value and the actual timing calibration ΤΑ' value is at (-ΔΤΑ, ΔΤΑ), for example, X may be 2χ Δ ΤΑ or 2.7χ Δ ΤΑ, then the access according to the reception is required The preamble sequence recalculates the threshold until the calculated error X is within the range (-ΔΤΑ, ΔΤΑ) of the actual timing calibration TA' value.

Therefore, in order to eliminate the large error caused by the uncertainty of the above wireless channel, in addition to ΔΤΑ, ΔΤΑ shown in FIG. 8, the ΤΑ value is subtracted from the predetermined value to obtain the target ΤΑ value, and The signaling sends the target threshold to the UE for adjusting the time offset:

Step 1), calculating the timing calibration threshold according to the received access preamble sequence;

Step 2), sending the timing calibration threshold to the user equipment to make the user equipment according to the The timing calibration value adjusts the transmission time of the service data and the transmission time of the access preamble sequence; Step 3), repeats the foregoing steps 1) and 2) until the difference between the calculated timing calibration TA value and the actual timing calibration ΤΑ' is ( Within a ΔΤΑ, ΔΤΑ);

In step 2), the user equipment adjusts the transmission time of the access preamble according to the threshold value, in addition to adjusting the transmission time of the service data according to the threshold value sent by the network side. Therefore, when step 1) is repeatedly performed, the network side actually recalculates the threshold according to the access preamble sequence sent by the user equipment at the adjusted time.

Step 4): Subtracting the calculated timing calibration ΤΑ value from the calculated value to obtain a target ΤΑ value, and transmitting the target threshold to the UE by using ΤΑ signaling to adjust the time offset.

Referring to FIG. 9, FIG. 9 is a schematic diagram of a basic process of a long-term evolution system uplink synchronization method according to an embodiment of the present invention. The embodiment shown in FIG. 9 can be applied to other access preamble sequences, for example, a Physical Uplink Shared Channel (PUSCH) sequence, or in addition to a sequence of a random access channel (PRACH). The sequence of the SRS (Sounding Reference Signal) sequence, the basic process includes:

Step S91: Send an access preamble sequence to the network side, where the access preamble sequence is a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence.

Step S92: Receive a TA value returned by the network side after processing the access preamble sequence. The network side receives the access preamble sequence, removes the CP, processes it and correlates with the local sequence, calculates an RTD value according to the correlation peak obtained by the correlation result, and calculates a corresponding TA value, and then passes the TA signaling. Send to the UE.

Step S93: Subtracting the calculated TA value by a predetermined value to obtain a target TA value.

The predetermined value is obtained according to the test statistics, and can be adjusted according to the actual operation of the network. The predetermined value related description can refer to the content of the foregoing random access channel detection method part.

Step S94: Adjust the time offset by using the target TA value to implement uplink synchronization with the eNodeB. After the adjustment, it can be considered to be synchronized with the eNodeB, and subsequent data can be sent on this basis.

10 is a schematic diagram of a basic structure of an uplink detection apparatus according to an embodiment of the present invention. The apparatus is applicable to processing a random access channel (PRACH, Physical Random Access). In addition to the sequence of the Channel, it is also applicable to processing other access preamble sequences, for example, a Physical Uplink Shared Channel (PUSCH) sequence or a SRS (Sounding Reference Signal) sequence, the embodiment shown in FIG. The base stations include:

The correlation unit 101 is configured to correlate an access preamble sequence from the UE with a local sequence, where the access preamble sequence is a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence, and the related specific method belongs to In the prior art, the description is not described here.

The first calculating unit 102 calculates a round trip delay RTD based on the correlation peak obtained by correlation, and calculates a timing calibration TA value.

The second calculating unit 103 subtracts the predetermined value from the TA value to obtain a target TA value.

The sending unit 104 is configured to send the target TA value to the UE, where the target TA value is a reference of the UE adjusting the time offset.

In this embodiment, the predetermined value may be a minimum granularity ΔΤΑ of the TA signaling, and the correlation unit 101 may be a random access channel sequence correlation unit, configured to perform a random access channel sequence from the UE and a local sequence. Related.

Considering various uncertainties of the wireless channel, the error X of the TA value obtained by the first calculating unit 102 according to the TA algorithm and the actual timing calibration TA' value may be several minimum granularities ΔΤΑ or several minimum granularities ΔΤΑ plus insufficient A minimum granularity ΔΤΑ, ie, the TA value and the actual timing calibration TA, the error X of the value may also fall outside (-ΔΤΑ, ΔΤΑ), for example, X may be 2χ Δ ΤΑ or 2.7χ Δ ΤΑ, then The threshold is further corrected until the error X of the recalculated threshold based on the received access preamble and the actual timing calibration TA' value is within (-ΔΤΑ, ΔΤΑ).

That is to say, in order to eliminate the large error caused by the uncertainty of the above wireless channel, in the embodiment shown in FIG. 10, if the first calibration unit 102 calculates the timing calibration threshold and the actual timing calibrationΤΑ The base station may further include: (a ΔΤΑ, ΔΤΑ), the base station may further include: The correcting unit 105 is configured to: when the first calculating unit 102 calculates the obtained timing calibration TA value and the actual timing calibration TA, when the difference between the values is outside (a ΔΤΑ, ΔΤΑ), trigger the UE to adjust the transmission of the service data multiple times. The time and the transmission timing of the access preamble sequence until the difference falls between (a ΔΤΑ, ΔΤΑ), and the target TA value is obtained according to the corresponding TA value when the difference satisfies the requirement. Specifically, the correcting unit 105 can be used to perform the following steps:

1) calculating the timing calibration TA value according to the received access preamble sequence;

2), sending the calculated timing calibration TA value to the user equipment, so that the user equipment adjusts the transmission time of the service data and the transmission time of the access preamble sequence according to the timing calibration value; wherein, in step 2) The user equipment adjusts the transmission time of the access preamble according to the TA value, in addition to adjusting the transmission time of the service data according to the TA value sent by the base station. Therefore, when step 1) is repeatedly performed, the base station actually recalculates the TA value according to the access preamble sequence transmitted by the user equipment at the adjusted time.

3), repeat the above 1) and 2) until the difference between the calculated timing calibration TA value and the actual timing calibration TA' is within (a ΔΤΑ, ΔΤΑ);

4), subtracting the calculated timing calibration TA value by a predetermined value to obtain a target TA value, and transmitting the target TA value to the UE by using TA signaling to adjust the time offset.

The access preamble detection apparatus disclosed in the embodiment of the present invention may be configured on the eNodeB, so that the eNodeB has the function of adjusting the TA value, so that the local timing is equal to or ahead of the UE timing (that is, the data sent by the UE arrives on time or lag. The eNodeB is configured to prevent the data sent by the UE from reaching the eNodeB in advance, thereby ensuring that the OFDM window for performing FFT integration includes a sample of a symbol, so that crosstalk between symbols is not caused, and the bit error rate is reduced.

A schematic diagram of a basic structure of an uplink synchronization apparatus according to an embodiment of the present invention is shown in FIG. 11, which includes:

The access preamble sending unit 111 is configured to send an access preamble sequence, where the access preamble sequence is a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence;

a timing calibration value receiving unit 112, configured to receive a timing calibration TA value sent by the network side, where The TA value is calculated by the network side according to the access preamble sequence and its local sequence; the timing calibration value processing unit 113 is configured to subtract the predetermined value from the TA value to obtain the target TA value;

The time offset adjustment unit 114 is configured to adjust the time offset according to the target TA value to achieve synchronization with the network side.

In this embodiment, the access preamble sequence sending unit 111 may be a random access channel sequence sending unit, configured to send a random access channel sequence; the timing calibration value receiving unit 112 may be a random access channel sequence. The timing calibration value receiving unit is configured to receive a timing calibration TA value sent by the network side, where the TA value is calculated by the network side according to the random access channel sequence and its local sequence.

The uplink synchronization apparatus in this embodiment may be configured on the UE, so that the UE can adjust the TA value to implement uplink synchronization with the network side. It should be noted that the term "synchronization" as used herein refers to relative synchronization. In fact, after the above adjustment, the UE and the network side may still not be absolutely synchronized, but at least the data sent by the UE may be reduced to reach the network side. The probability of causing crosstalk between symbols to reduce the bit error rate.

It should be noted that the UE having the apparatus for implementing uplink synchronization also belongs to the protection scope of the present invention.

Another embodiment of the present invention discloses a communication system, including:

a user equipment, configured to send an access preamble sequence, where the access preamble sequence is a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence;

a base station, configured to correlate an access preamble sequence from the UE with a local sequence, calculate a round trip delay RTD and a timing calibration TA value, subtract the predetermined value from the TA value to obtain a target TA value, and obtain the target The TA value is sent to the user equipment;

The user equipment adjusts the time offset according to the target TA value to implement uplink synchronization with the base station. The base station includes:

a correlation unit, configured to correlate an access preamble sequence from the UE with a local sequence; a first calculating unit, calculating a round trip delay RTD according to the correlation peak obtained by the correlation, and calculating a timing calibration TA value; a second calculating unit, subtracting the predetermined value from the TA value to obtain a target TA value;

And a sending unit, configured to send the target TA value to the UE, where the target TA value is a reference of the UE adjusting the time offset.

In this embodiment, the correlation unit may be a random access channel sequence correlation unit, configured to correlate a random access channel sequence from the UE with a local sequence; the user equipment may be a random access channel sequence sending device. , used to send a random access channel sequence.

Yet another communication system disclosed in the embodiment of the present invention includes:

a user equipment, configured to send an access preamble sequence, where the access preamble sequence includes a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence;

a base station, configured to correlate an access preamble sequence from the UE with a local sequence, and calculate a return delay RTD and a timing calibration TA value, and send the TA value to the user equipment;

After the user equipment acquires the TA value, the TA value is subtracted from the predetermined value to obtain a target TA value, and the time offset is adjusted according to the target TA value to implement uplink synchronization with the base station.

The user equipment includes:

An access preamble sending unit, configured to send an access preamble sequence;

a timing calibration value receiving unit, configured to receive a timing calibration TA value sent by the network side;

The timing calibration value processing unit is configured to subtract the predetermined value from the TA value to obtain a target TA value, and a time offset adjustment unit configured to adjust the time offset according to the target TA value to achieve synchronization with the network side. In this embodiment, the access preamble sequence sending unit may be a random access channel sequence sending unit, configured to send a random access channel sequence. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the method part. Those skilled in the art will appreciate that information, messages, and signals can be represented using any of a number of different processes and techniques. For example, the messages and information mentioned in the above description may be expressed as voltage, current, electromagnetic wave, magnetic field or magnetic particle, light field or any combination of the above.

A person skilled in the art will further appreciate the examples described in connection with the embodiments disclosed herein. The unit and algorithm steps can be implemented in electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition of each example has been generally described in terms of function in the above description. And steps. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. The program, when executed, may include the flow of an embodiment of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM). The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but the scope of the invention.

Claims

Rights request

A long-term evolution system uplink detection method, which is characterized by:

2. Method according to claim 1, characterized in that said predetermined value is the minimum granularity ΔΤΑ of the TA signalling.

The method according to claim 2, wherein if the calculated timing calibration threshold is compared to the actual timing calibration, the difference between the values is (a ΔΤΑ, ΔΤΑ), then the The threshold is subtracted from the predetermined value to obtain the target threshold, including:

Step 2), sending the timing calibration threshold to the user equipment, so that the user equipment adjusts the sending time of the service data and the sending time of the access preamble according to the timing calibration value;

Step 3), repeat the foregoing steps 1) and 2) until the difference between the calculated timing calibration threshold and the actual timing calibration ΤΑ' is within (a ΔΤΑ, ΔΤΑ);

Step 4), subtract the predetermined value from the calculated timing calibration threshold value in step 3) to obtain the target threshold value.

4. A method for uplink synchronization of a long term evolution system, characterized in that:

Receiving, by the network side, the ΤΑ signaling including the timing calibration threshold, where the ΤΑ value is calculated by the network side according to the access preamble sequence and its local sequence;

The target value is obtained by subtracting the predetermined value from the predetermined value, and the time offset is adjusted according to the target threshold to achieve synchronization with the network side.

An uplink detection apparatus, comprising: a correlation unit, configured to associate an access preamble sequence from the user equipment with a local sequence, where the access preamble sequence is a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence;

a first calculating unit, configured to calculate a round-trip delay RTD according to the correlation peak obtained by correlation, and calculate a timing calibration TA value;

a second calculating unit, configured to: subtract a predetermined value from the TA value to obtain a target TA value; a sending unit, configured to send the target TA value to the user equipment, where the target TA value is adjusted by the user equipment Time-biased benchmark.

6. The uplink detecting apparatus according to claim 5, wherein the predetermined value is a minimum granularity ΔΤΑ of TA signaling.

The uplink detecting apparatus according to claim 6, wherein the uplink detecting apparatus further comprises:

a correcting unit, configured to: when the difference between the calculated timing calibration threshold and the actual timing calibration is performed by the first calculating unit, when the difference between the values is outside (a ΔΤΑ, ΔΤΑ), triggering the UE to adjust the sending time of the service data multiple times and The transmission timing of the access preamble is accessed until the difference falls between (a ΔΤΑ, ΔΤΑ), and the target threshold is obtained according to the corresponding threshold value when the difference satisfies the requirement.

A base station, characterized in that the base station comprises the uplink detecting apparatus according to any one of claims 5 to 7.

9. An uplink synchronization device, comprising:

a timing calibration value receiving unit, configured to receive a timing calibration threshold sent by the network side, where the ΤΑ value is calculated by the network side according to the access preamble sequence and its local sequence;

The timing calibration value processing unit is configured to subtract the predetermined value from the threshold value to obtain a target threshold value, and the time offset adjustment unit is configured to adjust the time offset according to the target threshold value to achieve synchronization with the network side.

The uplink synchronization apparatus according to claim 10, wherein the access preamble sequence sending unit is a random access channel sequence sending unit, configured to send a random access channel sequence;

The timing calibration value receiving unit is a random access channel sequence timing calibration value receiving unit, configured to Receiving a timing calibration TA value sent by the network side, where the TA value is calculated by the network side according to the random access channel sequence and its local sequence.

A user terminal, characterized in that the user terminal comprises an uplink synchronization device as claimed in claim 9 or 10.

12. A communication system, comprising:

The communication system according to claim 12, wherein the base station comprises: a correlation unit, configured to correlate an access preamble sequence from the user equipment with a local sequence; Calculate the round-trip delay RTD from the correlation peak and calculate the timing calibration TA value;

a second calculating unit, subtracting the predetermined value from the TA value to obtain a target TA value;

And a sending unit, configured to send the target TA value to the user equipment, where the target TA value is a reference for adjusting the time offset of the user equipment.

The communication system according to claim 12, wherein the system further comprises: a user equipment, configured to send an access preamble sequence to the base station, where the access preamble sequence is a random access channel sequence, and a physical uplink And sharing the channel sequence or the monitoring reference signal sequence, and adjusting the time offset according to the target TA value received from the base station to implement uplink synchronization with the base station.

15. A communication system, comprising:

a user equipment, configured to send an access preamble sequence to the base station, where the access preamble sequence includes a random access channel sequence, a physical uplink shared channel sequence, or a listening reference signal sequence; and receiving a TA value sent by the base station, where the TA value is The target value is obtained by subtracting the predetermined value, and the time offset is adjusted according to the target TA value to achieve uplink synchronization with the base station.

The communication system according to claim 15, wherein the user equipment comprises: an access preamble sequence sending unit, configured to send an access preamble sequence;

a timing calibration value receiving unit, configured to receive a timing calibration TA value sent by the network side; The timing calibration value processing unit is configured to subtract the predetermined value from the TA value to obtain a target TA value. The time offset adjustment unit is configured to adjust the time offset according to the target TA value to implement synchronization with the network side.

The communication system according to claim 15, wherein the system further comprises: a base station, configured to receive an access preamble sequence sent by the user equipment, correlate the access preamble sequence with the local sequence, and calculate The round trip delay RTD and the timing calibration TA value are sent to the user equipment.