CN116723585B - Random access method, system, equipment and storage medium - Google Patents
Random access method, system, equipment and storage medium Download PDFInfo
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- 125000004122 cyclic group Chemical group 0.000 claims description 43
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side
Abstract
The invention provides a random access method, a system, equipment and a storage medium, wherein the method comprises the following steps: transmitting a random access preamble to a current base station; receiving a random access response sent by a current base station; when detecting that the detection lead code sequence is different from the second transmission lead code sequence, the detection lead code sequence is the same as the first transmission lead code sequence, and the detection lead code sequence and the second transmission lead code sequence belong to the same root sequence, judging that the random access lead code is successfully transmitted, and continuing the random access flow. The invention determines that the random access preamble is successfully transmitted through multiple judgments, thereby continuing the random access flow, and solving the problem that when judging that the detection preamble sequence is different from the transmission preamble sequence, the preamble transmission failure is directly judged to cause further retransmission or the random access failure, and the capability of the terminal for accessing the network is affected.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a random access method, system, device, and storage medium.
Background
Random access is the process by which a terminal establishes an initial radio connection with a cell, and is substantially similar for 4/5G. The terminal has obtained accurate downlink Timing when transmitting a random access preamble (preamble), but has not yet synchronized uplink, and the terminal needs to transmit the random access preamble with a default uplink Timing, which is called uplink Advance (Timing Advance) in the protocol.
The fixed advance is used when different terminals send the preamble, so that different delays exist when the base station receives the preamble of the terminal at different distances, and the delays are detected by the base station and inform the terminal as the accurate upstream Transmission Advance (TA) of the subsequent upstream transmission signals of the terminal. Thus, the base station detection procedure actually includes detection of a preamble sequence (RAPID) and detection of a TA. The base station successfully detects the preamble sequence (RAPID recv ) And after TA, will be in Random Access Response (RAR)The two information are sent to the terminal, which needs to detect the RAID from RAR recv And a transmission preamble sequence (RAPID) recorded by the terminal send ) And comparing, and judging whether the RAR is a response signal of the base station to the random access of the terminal. If RAPID recv ≠RAPID send The terminal considers that the preamble transmission fails. If RAPID recv ＝RAPID send The terminal considers that the preamble is successfully transmitted.
The processing mode of the conventional terminal for the random access response is as follows: when judging RAPID recv ≠RAPID send And when the preamble transmission is failed, further retransmission or random access failure is directly caused, and the network access capability of the terminal is affected.
Disclosure of Invention
The random access method, the system, the equipment and the storage medium can enhance the capability of the remote terminal for accessing the cell and reduce the time and the power consumption of random access.
The technical scheme provided by the invention is as follows:
in a first aspect, the invention discloses a random access method, comprising the steps of:
transmitting a random access preamble to a current base station;
receiving a random access response sent by the current base station, wherein the random access response carries a detection preamble sequence;
when the detection lead code sequence and the second transmission lead code sequence are detected to be different, the detection lead code sequence is the same as the first transmission lead code sequence, and the detection lead code sequence and the second transmission lead code sequence belong to the same root sequence, the random access lead code is judged to be successfully transmitted, the random access process is continued, the second transmission lead code sequence is the sequence of the random access lead code, and the first transmission lead code sequence is the previous transmission lead code sequence of the adjacent cyclic shift of the second transmission lead code sequence.
The present embodiment is achieved by when a detection preamble sequence and a second transmission preamble sequence are detectedThe preamble sequence is different and the same as the first transmission preamble sequence, and when the preamble sequence and the first transmission preamble sequence are detected to belong to the same root sequence, the random access preamble is judged to be successfully transmitted, so that the random access process can be continued, the random access process is continued, and the problem that when the RAPID is judged is solved recv ≠RAPID send And when the preamble transmission is failed, further retransmission or random access failure is caused directly, and the capability of the terminal for accessing the network is affected.
In some embodiments, the receiving the random access response sent by the current base station further includes:
determining whether the detection preamble sequence and the second transmission preamble sequence are identical;
when the detection lead code sequence and the second transmission lead code sequence are judged to be the same, the random access lead code is successfully transmitted, and the random access process is continued;
when the detection preamble sequence and the second transmission preamble sequence are judged to be different, judging whether the detection preamble sequence and the first transmission preamble sequence are identical or not;
when the detection preamble sequence and the first transmission preamble sequence are judged to be different, the random access preamble transmission fails;
When the detection preamble sequence and the first transmission preamble sequence are judged to be the same, judging whether the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence or not;
when the detection preamble sequence and the second transmission preamble sequence are judged not to belong to the same root sequence, the random access preamble transmission fails;
and when the detection lead code sequence and the second transmission lead code sequence are judged to belong to the same root sequence, the random access lead code is successfully transmitted, and the random access flow is continued.
In the present embodiment, the detection preamble sequence and the second transmission preamble sequence are determined to be identical to each other, thereby determining the detection preamble sequenceWhether the code sequence is the same as the first sending lead code sequence or not, and whether the detecting lead code sequence and the first sending lead code sequence belong to the same root sequence or not are judged, so that whether the random access lead code is successfully sent or not is determined through various judgment and progressive judgment, under the condition that the random access response is correctly received, the random access process can be continued, and the problem that when the RAPID is judged is solved recv ≠RAPID send And when the preamble transmission is failed, further retransmission or random access failure is caused directly, and the capability of the terminal for accessing the network is affected.
In some embodiments, after the random access preamble is successfully transmitted, the method further includes:
and generating a second uplink transmission advance by the first uplink transmission advance, the random access preamble time sequence length, the ZC sequence length for generating the random access preamble, the cyclic shift interval between adjacent sequences, the detection preamble sequence and the second transmission preamble sequence, wherein the second uplink transmission advance is used as the uplink transmission advance carried in the random access response sent by the current base station subsequently.
According to the embodiment, the second uplink transmission advance is generated through various parameters, the uplink transmission advance is reset and used as the uplink transmission advance carried in the random access response sent subsequently by the current base station, the accuracy of the uplink transmission advance is guaranteed, the probability of transmission failure is reduced, and meanwhile the capability of the remote terminal for accessing the cell is enhanced.
In some embodiments, the determining that the detection preamble sequence and the first transmission preamble sequence are identical comprises:
transmitting a new random access preamble to the current base station, the sequence of the new random access preamble comprising a new first transmit preamble sequence and a new second transmit preamble sequence;
Receiving a new random access response sent by a current base station, wherein the new random access response carries a new detection preamble sequence;
and when the new detection lead code sequence is judged to be the same as the new first transmission lead code sequence, judging that the current base station fails to detect the new random access lead code, but the new random access lead code is successfully transmitted, and continuing the random access flow.
According to the embodiment, the random access preamble is re-confirmed by sending the preamble once more, so that the random access response sent by the base station to other terminals by the terminal is prevented from being used as the random access response of the terminal, and the false detection probability is reduced.
According to a second aspect of the present invention, the present invention discloses a random access optimization system, comprising:
a sending module, configured to send a random access preamble to a current base station;
a receiving module, configured to receive a random access response sent by the current base station, where the random access response carries a detection preamble sequence;
and the detection judging module is used for judging that the random access preamble is successfully transmitted and continuing the random access process when detecting that the detection preamble sequence and the second transmission preamble sequence are different, wherein the detection preamble sequence and the first transmission preamble sequence are the same, and the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence, the second transmission preamble sequence is the sequence of the random access preamble, and the first transmission preamble sequence is the previous transmission preamble sequence of the adjacent cyclic shift of the second transmission preamble sequence.
In some embodiments, the random access optimization system further comprises:
a first judging module, configured to judge whether the detection preamble sequence and the second transmission preamble sequence are identical;
the first judging module is further configured to, when it is judged that the detected preamble sequence and the second transmitted preamble sequence are the same, successfully transmit the random access preamble, and continue the random access procedure;
a second judging module, configured to judge whether the detection preamble sequence and the first transmission preamble sequence are identical when judging that the detection preamble sequence and the second transmission preamble sequence are not identical;
the second judging module is further configured to, when it is judged that the detected preamble sequence and the first transmission preamble sequence are different, fail to transmit the random access preamble;
a third judging module, configured to judge whether the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence when judging that the detection preamble sequence and the first transmission preamble sequence are the same;
the third judging module is further configured to, when it is judged that the detected preamble sequence and the second transmitted preamble sequence do not belong to the same root sequence, fail to transmit the random access preamble;
And the third judging module is further configured to, when judging that the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence, successfully transmit the random access preamble and continue the random access procedure.
In some embodiments, the random access response further carries a first uplink transmission advance, and the random access optimization system further includes:
and the generation module is used for generating a second uplink transmission advance through the first uplink transmission advance, the random access preamble time sequence length, the ZC sequence length for generating the random access preamble, the cyclic shift interval between adjacent sequences, the detection preamble sequence and the second transmission preamble sequence, wherein the second uplink transmission advance is used as the uplink transmission advance carried in the random access response of the subsequent transmission of the current base station.
In some embodiments, the random access optimization system further comprises:
the sending module sends a new random access preamble to the current base station, wherein the sequence of the new random access preamble comprises a new first sending preamble sequence and a new second sending preamble sequence;
The receiving module receives a new random access response sent by the current base station, wherein the new random access response carries a new detection lead code sequence;
and the first judging module is further configured to, when judging that the new detection preamble sequence is the same as the new first transmission preamble sequence, judge that the current base station fails to detect the new random access preamble, but the new random access preamble is successfully transmitted, and continue the random access procedure.
According to a third aspect of the present invention, an electronic device is disclosed, including a memory and a processor, where the memory is configured to store an operating program, and the processor is configured to execute the operating program stored in the memory, so as to implement operations performed by the random access method.
According to a fourth aspect of the present invention, there is provided a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the random access method described above.
Compared with the prior art, the invention has at least the following beneficial effects:
1. through further judgment and combination with other conditions, whether the random access preamble is successfully transmitted is determined, and under the condition that the conditions are met, the random access response is considered to be correctly received, so that the random access flow can be continued, and the problem that when the RAPID is judged is solved recv ≠RAPID send When the preamble is transmitted, the preamble is directly judged to be failed, further retransmission is caused or random access is directly caused, and the capability of the terminal for accessing the network is affected;
2. only one preamble is sent, so that the time and the power consumption of random access are reduced;
3. the terminal sends the preamble once more, and the terminal reconfirm, so that the random access response sent by the base station to other terminals is prevented from being used as the random access response of the terminal, and the false detection probability is reduced;
4. generating a second uplink transmission advance, resetting the uplink transmission advance as an accurate uplink transmission advance of a subsequent uplink transmission signal of the terminal, ensuring the accuracy of the uplink transmission advance, reducing the probability of transmission failure, and enhancing the capability of the remote terminal for accessing the cell.
Drawings
The above features, technical features, advantages and implementation modes of the present invention will be further described in the following description of preferred embodiments with reference to the accompanying drawings in a clear and understandable manner.
Fig. 1 is a schematic flow chart of an embodiment of a random access method provided by the present invention;
fig. 2 is a schematic flow chart of another embodiment of a random access method provided in the present invention;
Fig. 3 is a schematic flow chart of another embodiment of a random access method provided in the present invention;
fig. 4 is a flow chart of another embodiment of a random access method according to the present invention;
fig. 5 is a schematic structural diagram of an embodiment of a random access system according to the present invention;
fig. 6 is a schematic structural diagram of a random access system according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of another embodiment of a random access system according to the present invention;
fig. 8 is a flow chart of another embodiment of a random access method according to the present invention.
Reference numerals illustrate:
the device comprises a sending module 10, a receiving module 20, a judging module 30, a generating module 40, a first judging module 50, a second judging module 60 and a third judging module 70.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
Random access is the process by which a terminal establishes an initial radio connection with a cell, and is substantially similar for 4/5G. Taking a 4G LTE network as an example, the method mainly comprises the following steps:
1. the terminal sends a random access preamble (preamble), MSG1, on the physical random access channel PRACH (Physical Random Access Channel) resource;
2. the terminal monitors the physical downlink control channel PDCCH (Physical Downlink Control Channel) in a random access response RAR (Random Access Respond) time window to receive the RAR, that is, MSG2;
3. the terminal sends MSG3 on the physical uplink shared channel PUSCH (Physical Uplink Shared Channel) and starts a contention resolution timer;
4. before the contention resolution timer expires, the terminal will always monitor the PDCCH to receive the contention resolution message, i.e. MSG4.
According to the description of 3GPP protocol TS36.211, chapter 5.7.2 (Preamble sequence generation), different preamble sequences may be generated from different cyclic shifts of the same root sequence, the generation formula being as follows:。
when detecting the preamble, the base station needs to detect the root sequence of the preamble, cyclic shift and transmission advance. Wherein the cyclic shift of the preamble (C V ) And a Transmission Advance (TA) are both calculated from the correlation peak positions. However, when the preamble transmitted by the remote terminal reaches the base station, the delay exceeds n×n CS ÷N ZC When (n=24576, is the preamble timing sequence length, N ZC =839 is the ZC sequence length of the generated preamble, N CS Is the cyclic shift interval between adjacent sequences. All are discussed here based on the preamble formats 0-3. For Format4, the same problem is solved, the above parameters are different, and the base station detection algorithm calculates the exceeding transmission delay part to the cyclic shift term, resulting in the base station feeding back the wrong preamble sequence (RAID) in RAR recv ) And an erroneous transmission advance TA.
The 3GPP protocol specifies: for an LTE FDD cell, a terminal sends a random access preamble by taking a default advance 0 as an initial TA; for an LTE TDD cell, the terminal sends a random access preamble with a default advance 624 as the initial TA.
Taking a configuration parameter in a certain actual network as an example, the preamble format=0, n CS =13 is the cyclic shift interval between adjacent sequences, n=24576 is the preamble timing sequence length, N ZC =839 is the ZC sequence length of the generated preamble, and the transmission advance calculation formula yields n×n CS ÷N ZC . That is, if the delay of the preamble reaching the base station exceeds 381 sampling units, a base station detection error occurs. The corresponding terminal is located at a distance l=381×10 from the base station -3 ×3×10 8 30720/2 (meters); that is, in this configuration, if the terminal and the access base station are more than 1860 meters apart, there is a problem in that there is a high probability that the base station detects the preamble of the adjacent cyclic shift and feeds back the preamble transmission error.
The random access method, the system, the equipment and the storage medium can enhance the capability of the remote terminal for accessing the cell and reduce the time and the power consumption of random access.
In one embodiment, referring to fig. 1 of the drawings, the random access method provided by the present application includes the steps of:
s110, sending a random access preamble to a current base station;
s120, receiving a random access response sent by a current base station, wherein the random access response carries a detection preamble sequence;
Specifically, different terminals use a fixed advance when transmitting Random Access Preambles (RAPID) on physical random access channel resources, so that different delays exist when the base station receives random access preambles transmitted by terminals at different distances, and the delays are detected by the base station and inform the terminal as accurate uplink Transmission Advance (TA) of subsequent uplink transmission signals of the terminal. Therefore, the base station detection process actually includes detection of the random access preamble sequence and detection of the uplink transmission advance. When the base station successfully detects the preamble sequence (RAPID recv ) And after the uplink transmission advance of the preamble, the two information are transmitted to the terminal in a Random Access Response (RAR), and the terminal receives the random access response transmitted by the current base station.
And S130, judging that the random access preamble is successfully transmitted and continuing the random access process when detecting that the detection preamble sequence and the second transmission preamble sequence are different, wherein the detection preamble sequence is identical to the first transmission preamble sequence, and the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence, the second transmission preamble sequence is the sequence of the random access preamble, and the first transmission preamble sequence is the previous transmission preamble sequence of the adjacent cyclic shift of the second transmission preamble sequence.
Specifically, in LTE, each cell has 64 preambles, where the set of preamble sequences is a root sequence and a cyclic shift sequence generated by the root sequence, and the calculation process includes the steps of: 1. generating a ZC root sequence as a reference sequence; 2. the reference root sequence is cyclically shifted, generating 63 different cyclic sequences. In general, it is only necessary to determine whether the detected preamble sequence and the transmitted preamble sequence are the same, but when the distance is too long, that is, the distance between the terminal and the access base station exceeds 1860 meters, there is a problem that the base station detects the preamble sequence of adjacent cyclic shift with a high probability, and feeds back the preamble transmission error. In this case, detection of the adjacent cyclic shift preamble sequence needs to be increased, and when the distance is too long, the fed back adjacent cyclic shift preamble sequence is the previous adjacent cyclic shift preamble sequence, and this can be done simplyThe 64 sequences are numbered and transmitted in ascending order, assuming a second transmit preamble sequence RAPID send The 50 th sequence is the 49 th sequence, and the first transmission preamble sequence is the previous transmission preamble sequence of adjacent cyclic shift of the second transmission preamble sequence, namely RAPID send -1 is also the 49 th sequence, that is, when the 50 th sequence is transmitted, the 49 th sequence is received, and at this time, it is determined whether the detection preamble sequence and the second transmission preamble sequence are cyclic sequences generated by cyclic shift of the same reference root sequence, and if so, the preamble sequence which is too far apart to cause feedback is one sequence later.
From the above, the terminal needs to detect the preamble sequence (RAPID) carried in the random access response recv ) And a second transmit preamble sequence (RAPID) recorded by the terminal send ) Compares with the first transmit preamble sequence (RAPID send -1) comparing when RAPID recv ≠RAPID send 、RAPID recv ＝RAPID send -1, RAPID recv And RAPID send And when the random access preamble codes belong to the same root sequence, judging that the random access preamble codes are successfully transmitted, judging that the Random Access Response (RAR) is a response signal of the base station to the random access of the terminal, and simultaneously continuing the random access flow.
In this embodiment, when it is detected that the detection preamble sequence and the second transmission preamble sequence are different and the detection preamble sequence and the first transmission preamble sequence are the same, and the detection preamble sequence and the first transmission preamble sequence belong to the same root sequence, the random access preamble transmission is determined to be successful, so that the random access procedure can be continued, and when the RAPID is determined to be successful recv ≠RAPID send And when the preamble transmission is failed, further retransmission or random access failure is caused directly, and the capability of the terminal for accessing the network is affected.
In one embodiment, referring to fig. 2 of the drawings, the method specifically comprises the following steps:
s210, sending a random access preamble to a current base station;
s220, receiving a random access response sent by the current base station, wherein the random access response carries a detection lead code sequence;
s230, judging whether the detection preamble sequence and the second transmission preamble sequence are the same;
s240, when the detection lead code sequence and the second transmission lead code sequence are judged to be the same, the random access lead code is successfully transmitted, and the random access flow is continued;
s250, when judging that the detection preamble sequence and the second transmission preamble sequence are different, judging whether the detection preamble sequence and the first transmission preamble sequence are identical;
s260, when it is determined that the detected preamble sequence and the first transmitted preamble sequence are different, the random access preamble transmission fails;
s270, when it is determined that the detection preamble sequence and the first transmission preamble sequence are identical, determining whether the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence;
S280, when the detection preamble sequence and the second transmission preamble sequence are judged not to belong to the same root sequence, the random access preamble transmission fails;
and S290, when the detection lead code sequence and the second transmission lead code sequence are judged to belong to the same root sequence, the random access lead code is successfully transmitted, and the random access flow is continued.
Specifically, the detection preamble sequence is RAPID recv The second transmit preamble sequence is RAPID send The first transmit preamble sequence is RAPID send -1. If RAPID recv =RAPID send And the terminal considers that the preamble is successfully transmitted and continues the random access flow. If RAPID recv ≠RAPID send Determine whether or not to RAPID recv ＝RAPID send -1, if RAPID recv ≠RAPID send -1, the terminal considers this timeFailure of preamble transmission, if RAPID recv ＝RAPID send -1, judging RAPID recv And RAPID send If the corresponding preamble sequence belongs to the same root sequence, if not, the terminal considers that the current preamble transmission fails, and if so, the terminal considers that the current preamble transmission is successful, and the random access flow is continued.
In this embodiment, by adding further judgment and combining with other conditions, it is judged whether the current terminal is too far from the base station, which results in the base station feeding back the wrong preamble sequence and the transmission advance, so as to judge that the preamble transmission fails, that is, by judging whether the detection preamble sequence is identical to the first transmission preamble sequence, judging whether the detection preamble sequence is identical to the second transmission preamble sequence, and judging whether the detection preamble sequence is identical to the first transmission preamble sequence, whether the random access preamble is successfully transmitted is determined, and under the condition of meeting the condition, the terminal considers that the current preamble is successfully transmitted, so that the random access procedure can be continued, thereby solving the problem that when judging the RAPID recv ≠RAPID send And when the preamble transmission is failed, further retransmission or random access failure is caused directly, and the capability of the terminal for accessing the network is affected. Meanwhile, the prior art can send the preamble once again after the detection fails, and the time and the power consumption of the random access can be increased.
In one embodiment, referring to fig. 3 of the drawings, on the basis of the above embodiment, the random access response further carries a first uplink transmission advance, and after S130, the method includes:
and S310, generating a second uplink transmission advance through the first uplink transmission advance, the random access preamble time sequence length, the ZC sequence length for generating the random access preamble, the cyclic shift interval between adjacent sequences, the detection preamble sequence and the second transmission preamble sequence, wherein the second uplink transmission advance is used as the uplink transmission advance carried in the random access response of the current base station for subsequent transmission.
Specifically, it can be seen from the above that when RAPID is determined recv ＝RAPID send -1, and RAPID recv And RAPID send When the corresponding preamble sequence belongs to the same root sequence, the distance between the terminal and the current base station exceeds 1860 meters, and at the moment, in order to prevent the error message from being received during re-detection, the second uplink transmission advance is generated by modifying the original transmission advance, namely the first uplink transmission advance, so as to reduce the probability of transmission failure. The generation method is that the advance TA is sent through the first uplink old Sequence length N of random access preamble sequence and sequence length N of random access preamble generation ZC Cyclic shift interval N between adjacent sequences CS Detecting preamble sequence RAPID recv And a second transmit preamble sequence RAPID send Generating a second upstream transmission advance TA new The calculation formula is as follows:。
according to the embodiment, the second uplink transmission advance is generated, the uplink transmission advance is reset and used as the accurate uplink transmission advance of the subsequent uplink transmission signals of the terminal, the accuracy of the uplink transmission advance is guaranteed, the probability of transmission failure is reduced, and meanwhile the capability of the remote terminal for accessing the cell is enhanced.
Further, after S240, the method includes:
and taking the first uplink mode advance as an uplink transmission advance of a subsequent uplink transmission signal of the terminal.
In one embodiment, referring to fig. 4 of the drawings, after S290, on the basis of the above embodiment, the method includes:
s410, transmitting a new random access preamble to the current base station, wherein the sequence of the new random access preamble comprises a new first transmission preamble sequence and a new second transmission preamble sequence;
s420, receiving a new random access response sent by the current base station, wherein the new random access response carries a new detection preamble sequence;
And S430, when the new detection lead code sequence is judged to be the same as the new first transmission lead code sequence, judging that the current base station fails to detect the new random access lead code, but the new random access lead code is successfully transmitted, and continuing the random access flow.
Specifically, in this embodiment, RAPID is judged in presence of RAPID recv ＝RAPID send -1, waiting for another preamble transmission, and re-proceeding with the process of S210 to S290, where the new detected preamble sequence is RAPID recv2 The new second transmit preamble sequence is RAPID send2 The new first transmit preamble sequence is RAPID send2 -1. If RAPID recv2 =RAPID send2 And the terminal considers that the preamble is successfully transmitted and continues the random access flow. If RAPID recv2 ≠RAPID send2 Determine whether or not to RAPID recv2 ＝RAPID send2 -1, if RAPID recv2 ≠RAPID send2 -1, the terminal considers that the preamble transmission fails, if RAPID recv2 ＝RAPID send2 -1, judging RAPID recv2 And RAPID send2 If the corresponding preamble sequence belongs to the same root sequence, if not, the terminal considers that the current preamble transmission fails, and if so, the terminal considers that the current preamble transmission is successful, and the random access flow is continued. If the situation occurs as RAPID recv ＝RAPID send -1 and RAPID recv2 ＝RAPID send2 And 1, judging that the detection of the random access preamble by the base station fails, and continuing the random access flow if the random access preamble is successfully transmitted.
The present embodiment re-performs random access preamble acknowledgement by receiving a new random access response when a new transmission preamble is transmitted, when RAPID occurs twice recv ＝RAPID send And (1) when judging that the base station fails to detect the random access preamble, the method avoids that the terminal uses the random access response sent by the base station to other terminals as the random access response of the terminal, and reduces the false detection probability.
In one embodiment, referring to fig. 8 of the drawings, the method comprises the steps of:
the terminal sends random access preamble, preamble sequence RAPID send ；
The terminal receives a random access response RAR, wherein the random access response RAR carries RAPID recv And transmit advance TA old ；
Judging whether RAPID recv ＝RAPID send ；
When judging RAPID recv ＝RAPID send In the time of preamble transmission, TA is used for transmitting the preamble successfully old Transmitting an advance as MG 3;
when judging RAPID recv ≠RAPID send When judging whether RAPID recv ＝RAPID send -1；
When judging RAPID recv ≠RAPID send -1, preamble transmission failure;
when judging RAPID recv ＝RAPID send -1, determine RAPID recv And RAPID send Whether belonging to the same ZC root sequence;
when judging RAPID recv And RAPID send When the preamble does not belong to the same ZC root sequence, the preamble transmission fails;
when judging RAPID recv And RAPID send When belonging to the same ZC root sequence, the preamble is successfully sent by TA new The advance is sent as MSG 3.
Specifically, random access is a procedure in which a terminal establishes an initial radio connection with a cell, and is substantially similar for 4/5G. Taking a 4G LTE network as an example, the method mainly comprises the following steps:
1. The terminal sends a random access preamble (preamble), MSG1, on the physical random access channel PRACH (Physical Random Access Channel) resource;
2. the terminal monitors the physical downlink control channel PDCCH (Physical Downlink Control Channel) in a random access response RAR (Random Access Respond) time window to receive the RAR, that is, MSG2;
3. the terminal sends MSG3 on the physical uplink shared channel PUSCH (Physical Uplink Shared Channel) and starts a contention resolution timer;
4. before the contention resolution timer expires, the terminal will always monitor the PDCCH to receive the contention resolution message, i.e. MSG4.
The terminal has obtained accurate downlink timing when transmitting a random access preamble (preamble), but has not yet synchronized uplink, and the terminal needs to transmit the random access preamble with a default uplink timing. This uplink Timing is referred to in the protocol as the uplink Advance (Timing Advance).
The 3GPP protocol specifies: for an LTE FDD cell, a terminal sends a random access preamble by taking a default advance 0 as an initial TA; for an LTE TDD cell, the terminal sends a random access preamble with a default advance 624 as the initial TA.
Different terminals use a fixed advance when transmitting random access preambles on physical random access channel resources, so that different delays exist in the preambles of the terminals at different distances received by the base station, and the delays are detected by the base station and notified to the terminal as accurate uplink Transmission Advance (TA) of subsequent uplink transmission signals of the terminal. Thus, the base station detection procedure actually includes detection of a preamble sequence (RAPID) and detection of an uplink Transmission Advance (TA). The base station successfully detects the preamble sequence (RAPID recv ) And an upstream Transmission Advance (TA) of the preamble, the two information are transmitted to the terminal in a Random Access Response (RAR).
In LTE, each cell has 64 preambles, where the set of preamble sequences is a root sequence and a cyclic shift sequence generated by the root sequence, and the calculation process steps are as follows: 1. generating a ZC root sequence as a reference sequence; 2. the reference root sequence is cyclically shifted, generating 63 different cyclic sequences. In general, it is only necessary to determine whether the detected preamble sequence and the transmitted preamble sequence are the same, but when the distance is too long, that is, the distance between the terminal and the access base station exceeds 1860 meters, there is a problem that the base station detects the preamble sequence of adjacent cyclic shift with a high probability, and feeds back the preamble transmission error. At this time, detection of adjacent cyclic shift preamble sequences needs to be increased, and feedback is needed when the distance is too longThe 64 sequences may simply be numbered and transmitted in ascending order, assuming that the second transmit preamble sequence RAPID is the immediately preceding one send The 50 th sequence is the 49 th sequence, and the first transmission preamble sequence is the previous transmission preamble sequence of adjacent cyclic shift of the second transmission preamble sequence, namely RAPID send -1 is also the 49 th sequence, that is, when the 50 th sequence is transmitted, the 49 th sequence is received, and at this time, it is determined whether the detection preamble sequence and the second transmission preamble sequence are cyclic sequences generated by cyclic shift of the same reference root sequence, and if so, the preamble sequence which is too far apart to cause feedback is one sequence later.
From the above, it can be seen that the terminal needs to respond to the RAPID detected from the random access response RAR recv And a transmission preamble sequence (RAPID) recorded by the terminal send ) Compares with the last transmitted preamble sequence (RAPID) send -1) comparing.
If RAPID recv ＝RAPID send Preamble transmission is successful with received transmission advance TA old As the uplink transmission advance of the subsequent MSG3 transmission, using; if RAPID recv ≠RAPID send Determine whether or not to RAPID recv ＝RAPID send -1; if RAPID recv ≠RAPID send -1, the terminal considers that the preamble transmission fails, if RAPID recv ＝RAPID send -1, judging RAPID recv And RAPID send If the corresponding preamble sequence belongs to the same ZC root sequence, if not, the terminal considers that the preamble transmission fails; if the preamble belongs to the field, the terminal considers that the preamble is successfully transmitted, and modifies the received transmission advance TA old Generation of TA new As the uplink transmission advance of the subsequent MSG3 transmission, the modification method is as follows:。
the present embodiment determines the transmitted preamble sequence RAPID send And the received preamble sequence RAPID recv Judging whether the received preamble sequence RAPID is the same recv And the last transmitted preamble sequence RAPID of the terminal send -1 whether or not they are identical and determining the received preamble sequence RAPID recv And the transmitted preamble sequence RAPID send Whether the random access preamble belongs to the same ZC root sequence or not is determined, so that whether the random access preamble is successfully transmitted is determined, and under the condition that the random access preamble is successfully transmitted, the terminal considers that the current preamble is successfully transmitted, so that the random access process can be continued, and the problem that when the RAPID is judged is solved recv ≠RAPID send And when the preamble transmission is failed, further retransmission or random access failure is caused directly, and the capability of the terminal for accessing the network is affected. And the new uplink transmission advance is generated, the uplink transmission advance is reset and used as the uplink transmission advance in the subsequent MSG3 of the terminal, so that the accuracy of the uplink transmission advance is ensured, the probability of transmission failure is reduced, and the capability of the remote terminal for accessing the cell is enhanced. Meanwhile, the prior art can send the preamble once again after the detection fails, and the time and the power consumption of the random access can be increased.
In one embodiment, referring to fig. 5 of the drawings, the random access system provided by the present application includes: a transmitting module 10, a receiving module 20 and a detecting and judging module 30.
A transmitting module 10, configured to transmit a random access preamble to a current base station;
a receiving module 20, configured to receive a random access response sent by a current base station, where the random access response carries a detection preamble sequence;
specifically, different terminals use a fixed advance when transmitting the random access preamble through the transmission module 10 on the physical random access channel resource, so that the preambles of the terminals at different distances received by the base station have different delays, and the delays are detected and notified by the base stationThe terminal is used as an accurate uplink Transmission Advance (TA) of a subsequent uplink transmission signal of the terminal. Thus, the base station detection procedure actually includes detection of a preamble sequence (RAPID) and detection of an uplink Transmission Advance (TA). The base station successfully detects the preamble sequence (RAPID recv ) And an uplink Transmission Advance (TA) of the preamble, the two information are transmitted to the terminal in a Random Access Response (RAR), and then the receiving module 20 receives the random access response transmitted by the current base station.
The detection judging module 30 is configured to judge that the random access preamble is successfully transmitted and continue the random access procedure when detecting that the detection preamble sequence and the second transmission preamble sequence are different, and that the detection preamble sequence and the first transmission preamble sequence are identical, and that the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence, where the second transmission preamble sequence is a sequence of the random access preamble, and the first transmission preamble sequence is a preceding transmission preamble sequence that is adjacent and cyclically shifted to the second transmission preamble sequence.
Specifically, in LTE, each cell has 64 preambles, where the set of preamble sequences is a root sequence and a cyclic shift sequence generated by the root sequence, and the calculation process includes the steps of: 1. generating a ZC root sequence as a reference sequence; 2. the reference root sequence is cyclically shifted, generating 63 different cyclic sequences. In general, it is only necessary to determine whether the detected preamble sequence and the transmitted preamble sequence are the same, but when the distance is too long, that is, the distance between the terminal and the access base station exceeds 1860 meters, there is a problem that the base station detects the preamble sequence of adjacent cyclic shift with a high probability, and feeds back the preamble transmission error. At this time, detection of adjacent cyclic shift preamble sequences needs to be increased, and when the distance is too far, the fed back adjacent cyclic shift preamble sequences are the previous adjacent, at this time, the 64 sequences can be simply marked and sent in ascending order, and the second sending preamble sequence RAPID is assumed send The 50 th sequence is the 49 th sequence, and the first transmission preamble sequence is the second transmission preamble sequenceThe immediately preceding transmit preamble sequence of the adjacent cyclic shift, i.e. RAPID send -1 is also the 49 th sequence, that is, when the 50 th sequence is transmitted, the 49 th sequence is received, and at this time, it is determined whether the detection preamble sequence and the second transmission preamble sequence are cyclic sequences generated by cyclic shift of the same reference root sequence, and if so, the preamble sequence which is too far apart to cause feedback is one sequence later.
From the above, the receiving module 20 needs to determine the RAPID detected from the RAR recv And a second transmit preamble sequence (RAPID) recorded by the terminal send ) Compares with a first transmit preamble sequence (RAPID) send -1) comparing when RAPID recv ≠RAPID send 、RAPID recv ＝RAPID send -1, RAPID recv And RAPID send -1 when the base station belongs to the same root sequence, the receiving module 20 judges that the random access preamble is successfully transmitted, judges that the Random Access Response (RAR) is a response signal of the base station to the random access of the terminal, and can continuously perform the random access process at the same time, thereby solving the problem that when the RAPID is judged recv ≠RAPID send And when the preamble transmission is failed, further retransmission or random access failure is caused directly, and the capability of the terminal for accessing the network is affected.
In one embodiment, referring to fig. 6 of the drawings, the random access system provided by the present application includes: the device comprises a sending module 10, a receiving module 20, a first judging module 50, a second judging module 60 and a third judging module 70.
A transmitting module 10, configured to transmit a random access preamble to a current base station;
a receiving module 20, configured to receive a random access response sent by a current base station, where the random access response carries a detection preamble sequence;
a first judging module 50, configured to judge whether the detection preamble sequence and the second transmission preamble sequence are identical;
the first judging module 50 is further configured to, when it is judged that the detected preamble sequence and the second transmitted preamble sequence are the same, successfully transmit the random access preamble, and continue the random access procedure;
a second judging module 60, configured to judge whether the detection preamble sequence and the first transmission preamble sequence are identical when judging that the detection preamble sequence and the second transmission preamble sequence are not identical;
the second judging module 60 is further configured to, when it is judged that the detected preamble sequence and the first transmitted preamble sequence are different, fail to transmit the random access preamble;
A third judging module 70, configured to judge whether the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence when judging that the detection preamble sequence and the first transmission preamble sequence are the same;
the third judging module 70 is further configured to, when it is judged that the detected preamble sequence and the second transmitted preamble sequence do not belong to the same root sequence, fail to transmit the random access preamble;
the third determining module 70 is further configured to, when it is determined that the detected preamble sequence and the second transmitted preamble sequence belong to the same root sequence, successfully transmit the random access preamble, and continue the random access procedure.
Specifically, the detection preamble sequence is RAPID recv The second transmit preamble sequence is RAPID send The first transmit preamble sequence is RAPID send -1. If the first judging module 50 judges RAPID recv =RAPID send The first judging module 50 judges that the preamble transmission is successful and continues the random access procedure. If the first judging module 50 judges RAPID recv ≠RAPID send The second judgment module 60 judges whether or not RAPID recv ＝RAPID send -1, if the second determination module 60 determines RAPID recv ≠RAPID send -1, the second judging module 60 judges that the preamble transmission fails, if the second judging module 60 judges RAPID recv ＝RAPID send -1, third determination module 70 determines RAPID recv And RAPID send Whether the corresponding preamble sequences belong to the same root sequence, if the third judgment module 70 judges that the corresponding preamble sequences do not belong to the same root sequence, the third judgmentThe module 70 determines that the current preamble transmission fails, and if the third determination module 70 determines that the current preamble transmission is successful, the third determination module 70 continues the random access procedure.
In this embodiment, a plurality of judging modules are mutually matched to judge whether the base station feeds back the wrong preamble sequence and the wrong transmission advance because the current terminal is far away from the base station, so as to judge that the preamble transmission fails, namely, whether the detection preamble sequence is identical to the first transmission preamble sequence, whether the detection preamble sequence is identical to the second transmission preamble sequence, and whether the detection preamble sequence and the first transmission preamble sequence belong to the same root sequence are judged, so as to determine whether the random access preamble is successfully transmitted, and under the condition of meeting the condition, the terminal considers that the preamble is successfully transmitted this time, so that the random access process can be continued, thereby solving the problem that when the RAPID is judged recv ≠RAPID send And when the preamble transmission is failed, further retransmission or random access failure is caused directly, and the capability of the terminal for accessing the network is affected. Meanwhile, the prior art can send the preamble once again after the detection fails, and the time and the power consumption of the random access can be increased.
In an embodiment, the random access response further carries a first uplink transmission advance, and referring to fig. 7 of the specification, on the basis of the above embodiment, the random access system provided by the present application further includes: a generation module 40.
The generating module 40 is configured to generate a second uplink transmission advance by using the first uplink transmission advance, the random access preamble timing sequence length, the ZC sequence length for generating the random access preamble, the cyclic shift interval between adjacent sequences, the detection preamble sequence and the second transmission preamble sequence, where the second uplink transmission advance is used as the uplink transmission advance carried in the random access response sent subsequently by the current base station.
Specifically, it can be seen from the above that when RAPID is determined recv ＝RAPID send -1And RAPID recv And RAPID send When the corresponding preamble sequence belongs to the same root sequence, the distance between the terminal and the current base station exceeds 1860 meters, and at the moment, in order to prevent the error message from being received during re-detection, the second uplink transmission advance is generated by modifying the original transmission advance, namely the first uplink transmission advance, so as to reduce the probability of transmission failure. The generating method is that the generating module 40 sends the advance TA through the first uplink old Sequence length N of random access preamble sequence and sequence length N of random access preamble generation ZC Cyclic shift interval N between adjacent sequences CS Detecting preamble sequence RAPID recv And a second transmit preamble sequence RAPID send Generating a second upstream transmission advance TA new The calculation formula is as follows:。
in this embodiment, the generating module 40 generates the second uplink transmission advance, resets the uplink transmission advance, and uses the second uplink transmission advance as the accurate uplink transmission advance of the subsequent uplink transmission signal of the terminal, thereby ensuring the accuracy of the uplink transmission advance, reducing the probability of transmission failure, and enhancing the capability of the remote terminal to access the cell.
In one embodiment, referring to fig. 6 of the drawings, the random access system provided by the present application further includes:
a transmission module 10 transmitting a new random access preamble to the current base station, the sequence of the new random access preamble including a new first transmission preamble sequence and a new second transmission preamble sequence;
a receiving module 20, configured to receive a new random access response sent by the current base station, where the new random access response carries a new detection preamble sequence;
the first determining module 50 is further configured to determine that the current base station fails to detect the new random access preamble, but the new random access preamble is successfully transmitted, and continue the random access procedure when determining that the new detected preamble sequence is identical to the new first transmitted preamble sequence.
Specifically, in this embodiment, RAPID is judged in presence of RAPID recv ＝RAPID send -1, waiting for the transmitting module 10 to transmit the preamble again, receiving module 20 receiving the new random access preamble, and re-performing the processes of the first judging module 50, the second judging module 60 and the third judging module 70, where the new detection preamble sequence is RAPID recv2 The new second transmit preamble sequence is RAPID send2 The new first transmit preamble sequence is RAPID send2 -1. If the first judging module 50 judges RAPID recv2 =RAPID send2 The first judging module 50 judges that the preamble transmission is successful and continues the random access procedure. If the first judging module 50 judges RAPID recv2 ≠RAPID send2 The second judgment module 60 judges whether or not RAPID recv2 ＝RAPID send2 -1, if the second determination module 60 determines RAPID recv2 ≠RAPID send2 -1, the second judging module 60 judges that the preamble transmission fails, if the second judging module 60 judges RAPID recv2 ＝RAPID send2 -1, third determination module 70 determines RAPID recv2 And RAPID send2 If the corresponding preamble sequence belongs to the same root sequence, if the third judging module 70 judges that the preamble sequence does not belong to the root sequence, the third judging module 70 judges that the transmission of the current preamble fails, and if the third judging module 70 judges that the preamble sequence belongs to the root sequence, the third judging module 70 judges that the transmission of the current preamble is successful and continues the random access flow. If the situation occurs as RAPID recv ＝RAPID send -1 and RAPID recv2 ＝RAPID send2 -1, the first determining module 50 determines that the detection of the random access preamble by the base station fails, but the random access preamble is successfully transmitted, and continues the random access procedure.
In this embodiment, the transmitting module 10 transmits a new transmission preamble, the receiving module 20 receives a new random access response, the first judging module 50 performs random access preamble confirmation again, and when RAPID occurs twice recv ＝RAPID send At-1, the first judging module 50 judges that the base station fails to detect the random access preamble, so as to avoid the terminalThe terminal uses the random access response sent by the base station to other terminals as the random access response of the terminal, and reduces the false detection probability.
In one embodiment, the application also discloses an electronic device, which comprises a memory and a processor, wherein the memory is used for storing an operation program, the processor is used for executing the operation program stored in the memory, and the operation performed by the random access method in the embodiment is realized, and the processor can be a CPU, a controller, a microcontroller, a microprocessor or other data processing chips.
In one embodiment, the present application provides a computer readable storage medium storing a control program for implementing the random access method as described above when executed by a processor. The aspects of the present application, or portions thereof, may be embodied in the form of a software product stored on a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of a method according to various method embodiments of the present application. The computer readable storage medium includes a usb disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), and other various media capable of carrying computer program code.
Since all the technical solutions of all the embodiments are adopted when the random access procedure is executed by the processor, at least all the beneficial effects brought by all the technical solutions of all the embodiments are provided, and will not be described in detail herein.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. A random access method, comprising the steps of:
transmitting a random access preamble to a current base station;
receiving a random access response sent by the current base station, wherein the random access response carries a detection preamble sequence;
when the detection lead code sequence and the second transmission lead code sequence are detected to be different, the detection lead code sequence is the same as the first transmission lead code sequence, and the detection lead code sequence and the second transmission lead code sequence belong to the same root sequence, judging that the random access lead code is successfully transmitted, continuing the random access process, wherein the second transmission lead code sequence is the sequence of the random access lead code, and the first transmission lead code sequence is the previous transmission lead code sequence of the adjacent cyclic shift of the second transmission lead code sequence;
The random access response also carries a first uplink transmission advance, and generates a second uplink transmission advance by the first uplink transmission advance, the random access preamble time sequence length, the ZC sequence length for generating the random access preamble, the cyclic shift interval between adjacent sequences, the detection preamble sequence and the second transmission preamble sequence, wherein the second uplink transmission advance is used as the uplink transmission advance carried in the random access response sent by the current base station.
2. The random access method according to claim 1, wherein the step of receiving the random access response sent by the current base station further comprises:
determining whether the detection preamble sequence and the second transmission preamble sequence are identical;
when the detection lead code sequence and the second transmission lead code sequence are judged to be the same, the random access lead code is successfully transmitted, and the random access process is continued;
when the detection preamble sequence and the second transmission preamble sequence are judged to be different, judging whether the detection preamble sequence and the first transmission preamble sequence are identical or not;
When the detection preamble sequence and the first transmission preamble sequence are judged to be different, the random access preamble transmission fails;
when the detection preamble sequence and the first transmission preamble sequence are judged to be the same, judging whether the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence or not;
when the detection preamble sequence and the second transmission preamble sequence are judged not to belong to the same root sequence, the random access preamble transmission fails;
and when the detection lead code sequence and the second transmission lead code sequence are judged to belong to the same root sequence, the random access lead code is successfully transmitted, and the random access flow is continued.
3. A random access system, comprising:
a sending module, configured to send a random access preamble to a current base station;
a receiving module, configured to receive a random access response sent by the current base station, where the random access response carries a detection preamble sequence;
a detection judging module, configured to judge that the random access preamble is successfully transmitted and continue a random access procedure when it is detected that the detection preamble sequence and the second transmission preamble sequence are different, where the detection preamble sequence and the first transmission preamble sequence are the same, and the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence, and the second transmission preamble sequence is a sequence of the random access preamble, and the first transmission preamble sequence is a previous transmission preamble sequence that is adjacent and cyclically shifted to the second transmission preamble sequence;
The random access response also carries a first uplink transmission advance;
and the generation module is used for generating a second uplink transmission advance through the first uplink transmission advance, the random access preamble time sequence length, the ZC sequence length for generating the random access preamble, the cyclic shift interval between adjacent sequences, the detection preamble sequence and the second transmission preamble sequence, wherein the second uplink transmission advance is used as the uplink transmission advance carried in the random access response of the subsequent transmission of the current base station.
4. A random access system according to claim 3, further comprising:
a first judging module, configured to judge whether the detection preamble sequence and the second transmission preamble sequence are identical;
the first judging module is further configured to, when it is judged that the detected preamble sequence and the second transmitted preamble sequence are the same, successfully transmit the random access preamble, and continue the random access procedure;
a second judging module, configured to judge whether the detection preamble sequence and the first transmission preamble sequence are identical when judging that the detection preamble sequence and the second transmission preamble sequence are not identical;
The second judging module is further configured to, when it is judged that the detected preamble sequence and the first transmission preamble sequence are different, fail to transmit the random access preamble;
a third judging module, configured to judge whether the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence when judging that the detection preamble sequence and the first transmission preamble sequence are the same;
the third judging module is further configured to, when it is judged that the detected preamble sequence and the second transmitted preamble sequence do not belong to the same root sequence, fail to transmit the random access preamble;
and the third judging module is further configured to, when judging that the detection preamble sequence and the second transmission preamble sequence belong to the same root sequence, successfully transmit the random access preamble and continue the random access procedure.
5. An electronic device comprising a memory and a processor, the memory having a control program stored thereon, the control program being loaded and executed by the processor to implement a random access method according to any of claims 1-2.
6. A computer readable storage medium, characterized in that the computer readable storage medium stores a control program for implementing a random access method according to any of claims 1-2 when executed by a processor.
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| CN114679794A (en) * | 2020-12-24 | 2022-06-28 | 中兴通讯股份有限公司 | Random access method, device, terminal, electronic equipment and readable storage medium |
| CN113727460A (en) * | 2021-11-04 | 2021-11-30 | 广东省新一代通信与网络创新研究院 | Random access process processing method and device |
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