CN116506968B - Link time offset determination method and device and electronic equipment - Google Patents
Link time offset determination method and device and electronic equipment Download PDFInfo
- Publication number
- CN116506968B CN116506968B CN202310738716.0A CN202310738716A CN116506968B CN 116506968 B CN116506968 B CN 116506968B CN 202310738716 A CN202310738716 A CN 202310738716A CN 116506968 B CN116506968 B CN 116506968B
- Authority
- CN
- China
- Prior art keywords
- timing advance
- preamble
- determining
- detection window
- preamble sequence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000001514 detection method Methods 0.000 claims description 201
- 125000004122 cyclic group Chemical group 0.000 claims description 42
- 238000004590 computer program Methods 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 12
- 238000005070 sampling Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 101100274486 Mus musculus Cited2 gene Proteins 0.000 description 1
- 101100533725 Mus musculus Smr3a gene Proteins 0.000 description 1
- 101150096622 Smr2 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
- H04W74/0891—Non-scheduled access, e.g. ALOHA using a dedicated channel for access for synchronized access
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention provides a method and a device for determining link time bias and electronic equipment, and relates to the technical field of wireless communication, wherein the method comprises the following steps: determining a first preamble identity and a first timing advance based on the received preamble sequence; judging the size of the first timing advance; and under the condition that the first timing advance is greater than 0 and greater than a threshold value, determining that the current link has negative timing offset, determining that the first preamble identification and the first timing advance are incorrect, and correcting the first preamble identification and the first timing advance. The invention judges the magnitude of the first timing advance, and determines that the first preamble mark and the first timing advance are incorrect and corrects the first preamble mark and the first timing advance under the condition that the first timing advance is larger than 0 and larger than a threshold value, thereby improving the accuracy of correctly detecting the preamble mark and the timing advance by the base station and further improving the probability of successful random access.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for determining a link time offset, and an electronic device.
Background
In the uplink of a wireless communication system, a base station processes data transmitted by a plurality of User Equipments (UEs) at the same time, and the base station needs to ensure that data from a plurality of UEs arrive at the base station at the same time as much as possible, so that the data of a plurality of UEs are received "synchronously" at the base station, i.e. the time errors of arrival of data of different UEs transmitted in the same uplink subframe at the base station are within the range of Cyclic Prefix (CP).
Because the distances between different UEs and the base station in the same cell are different, if the transmission Time of each UE is not adjusted, the base station will first receive the data sent by the UE closest to itself, and finally receive the data sent by the UE at the cell edge position, and cannot guarantee that the data in the same uplink subframe is received synchronously.
In the related art, the uplink establishes synchronization through a random access procedure, and in a 4-step random access channel (Random Access Channel, RACH) procedure, the base station detects a preamble identifier (preamble Identity, preamble ID) and estimates the TA of the uplink according to the Msg1 transmitted by the UE, i.e., the preamble (preamble) of the physical random access channel (Physical Random Access Channel, PRACH), and then transmits TA indication information to the UE through the Msg2, i.e., the random access response, so as to achieve the purpose of adjusting the transmission time of each UE.
However, the related art has the following drawbacks: the precondition that the preamble ID and link TA value can be obtained correctly is: the Power-delay Profile (PDP) peak of the preamble sequence falls within the correct PRACH detection window. When the link has negative time bias, the PRACH detection window of the base station can adjust the position of the detection window according to a forward offset to ensure that the PDP peak value can fall into a correct detection window; however, when the negative timing offset existing in the link is large, there is a case that the forward offset of the base station detection window and the actual TA of the link are not matched, so that the correct preamble ID and the link TA cannot be detected.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a method and a device for determining link time offset and electronic equipment.
In a first aspect, the present invention provides a method for determining a link time offset, including:
determining a first preamble identity and a first timing advance based on the received preamble sequence;
judging the size of the first timing advance;
and under the condition that the first timing advance is greater than 0 and greater than a threshold value, determining that the current link has negative timing offset, determining that the first preamble identifier and the first timing advance are incorrect, correcting the first preamble identifier to obtain a second preamble identifier, and correcting the first timing advance to obtain a second timing advance.
Optionally, according to the method for determining a link time offset provided by the present invention, the determining, based on the received preamble sequence, the first preamble identifier and the first timing advance includes:
determining a cyclic shift length of the preamble sequence, and determining a first detection window based on the cyclic shift length of the preamble sequence, wherein the first detection window comprises a plurality of first sub-detection windows, and each first sub-detection window respectively has a corresponding first identifier and a first starting position;
forward adjusting the first detection window to obtain a second detection window, wherein the second detection window comprises a plurality of second sub-detection windows, and each second sub-detection window is provided with a corresponding second mark and a second starting position respectively;
determining a time domain index of an effective path corresponding to a peak value of a power delay spectrum PDP of the preamble sequence, determining a target second sub-detection window of which the time domain index is positioned in the second detection window, and taking a target second identifier corresponding to the target second sub-detection window as the first preamble identifier;
determining a target first starting position corresponding to a target first sub-detection window in the first detection window, wherein a target first identifier corresponding to the target first sub-detection window is equal to the target second identifier;
And taking the difference value between the time domain index and the first starting position of the target as the first timing advance.
Optionally, according to the method for determining a link time offset provided by the present invention, the correcting the first timing advance to obtain a second timing advance includes:
determining the length of the preamble sequence, the number of points of fast Fourier transform FFT (fast Fourier transform) performed on the preamble sequence by a receiving end, and the resolution of each path corresponding to the PDP;
and correcting the first timing advance based on the first timing advance, the length of the preamble sequence, the cyclic shift length of the preamble sequence, the number of points of the FFT, and the resolution to obtain the second timing advance.
Optionally, according to the method for determining a link time offset provided by the present invention, the correcting the first timing advance to obtain the second timing advance based on the first timing advance, the length of the preamble sequence, the cyclic shift length of the preamble sequence, the number of points of the FFT, and the resolution includes:
correcting the first timing advance based on the following formula to obtain the second timing advance:
；
wherein ,representing said second timing advance,/v>Representing the first timing advance, +.>Representing the length of the preamble sequence, +.>Representing the cyclic shift length of said preamble sequence, < >>Points representing the FFT,>representing the resolution.
Optionally, according to the method for determining the link time offset provided by the present invention, the correcting the first preamble identifier to obtain a second preamble identifier includes:
and adding 1 to the first preamble identifier to obtain the second preamble identifier.
Optionally, according to the method for determining a link time offset provided by the present invention, before the determining the size of the first timing advance, the method further includes:
determining the length of the preamble sequence, the cyclic shift length of the preamble sequence and the number of points of fast Fourier transform FFT (fast Fourier transform) performed on the preamble sequence by a receiving end;
the threshold is determined based on a length of the preamble sequence, a cyclic shift length of the preamble sequence, and a number of points of the FFT.
Optionally, according to the method for determining link time offset provided by the present invention, the determining the threshold value based on the length of the preamble sequence, the cyclic shift length of the preamble sequence, and the number of points of the FFT includes:
The threshold value is determined based on the following formula:
；
wherein ,representing the threshold value,/->Representing the length of the preamble sequence, +.>Representing the cyclic shift length of said preamble sequence, < >>Points representing the FFT,>is a coefficient and->，/>To round down the symbol.
Optionally, according to the method for determining the link time offset provided by the present invention, the method further includes:
under the condition that the first timing advance is less than 0, determining that a current link has negative timing offset, and determining that the first preamble identifier and the first timing advance are correct;
and under the condition that the first timing advance is larger than 0 and smaller than the threshold value, determining that the current link has timing offset, and determining that the first preamble identification and the first timing advance are correct.
In a second aspect, the present invention further provides a device for determining a link time offset, including:
a first determining module, configured to determine a first preamble identifier and a first timing advance based on the received preamble sequence;
the judging module is used for judging the size of the first timing advance;
and the second determining module is used for determining that the current link has negative timing offset and determining that the first lead code identifier and the first timing advance are incorrect under the condition that the first timing advance is greater than 0 and greater than a threshold value, correcting the first lead code identifier to obtain a second lead code identifier and correcting the first timing advance to obtain a second timing advance.
In a third aspect, the present invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of determining link time bias according to the first aspect when executing the program.
According to the method, the device and the electronic equipment for determining the link time offset, the first preamble identification and the first timing advance are determined based on the received preamble sequence, the size of the first timing advance is further judged, the first preamble identification and the first timing advance are determined to be incorrect under the condition that the first timing advance is determined to be greater than 0 and greater than the threshold, the first preamble identification and the first timing advance are corrected, the second preamble identification and the second timing advance are obtained, and the accuracy of correctly detecting the preamble identification and the timing advance by the base station can be improved, so that the probability of success of random access is improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a base station detecting a PRACH signal provided in the related art;
fig. 2 is a schematic flow chart of detecting a preamble ID and estimating a link TA by a base station according to the related art;
fig. 3 is a schematic diagram of a PRACH detection window provided by the present invention;
FIG. 4 is a flow chart of a method for determining link time offset provided by the invention;
FIG. 5 is a schematic flow chart of determining a first timing advance according to the present invention;
FIG. 6 is a schematic diagram showing that the effective diameter corresponding to the peak value of PDP falls into the detection window under the condition that the first timing advance is less than 0;
FIG. 7 is a schematic diagram showing that the effective diameter corresponding to the peak value of PDP falls into the detection window under the condition that the first timing advance is greater than 0 but less than the threshold value;
FIG. 8 is a schematic diagram of an effective path corresponding to a peak value of a PDP falling into a detection window under the condition that a first timing advance is greater than a threshold value;
FIG. 9 is a schematic structural diagram of a link time offset determining device provided by the invention;
fig. 10 is a schematic diagram of the physical structure of the electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the description of the present invention, the terms "first," "second," and the like are used for distinguishing between similar objects and not for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present invention may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more.
In order to facilitate a clearer understanding of various embodiments of the present invention, some relevant background knowledge is first presented as follows.
Fig. 1 is a schematic flow chart of detecting a PRACH signal by a base station according to the related art, as shown in fig. 1, including:
step 100, blind detection of a base station is carried out to obtain preamble time domain data;
step 110, performing fast fourier transform (Fast Fourier Transform, FFT) after demapping the preamble time domain data to obtain preamble frequency domain data;
step 120, performing inverse fast fourier transform (Inverse Fast Fourier Transform, IFFT) to convert preamble frequency domain data and local root sequence conjugate multiplication to time domain data, thereby obtaining PDP power;
Step 130, combining the PDP power to obtain the position of the PDP peak value;
in step 140, preamble ID detection and TA estimation are performed based on the PDP peak position and the PRACH detection window start position.
As can be seen from fig. 1, in the related art, the base station performs time domain correlation calculation on the received preamble sequence to obtain PDP power distribution, and performs preamble ID detection and TA estimation according to the actually detected PDP peak value and the start position of the PRACH detection window by using good auto-correlation and cross-correlation of the ZC (Zadoff-Chu) sequence.
However, the precondition that the preamble ID and the link TA value can be correctly obtained in the related art is that: the PDP peaks of the preamble sequence fall within the correct PRACH detection window. Fig. 2 is a schematic flow chart of detecting a preamble ID and estimating a link TA by a base station according to the related art, and as shown in fig. 2, includes:
step 200, according to the cyclic shift length (N CS ) Calculating a starting position Window_Index of the PRACH detection Window;
step 210, performing forward adjustment on window_index to match the possible negative time offset of the link, and obtaining an adjusted PRACH detection Window;
step 220, detecting preamble ID based on the adjusted PRACH detection window, and determining the ID of the detection window where the PDP peak is located as the preamble ID;
Step 230, determining the difference between the initial position of the detection window where the PDP peak is located and the position of the PDP peak as the link TA.
The related art has the following defects: when the link has negative time bias, the PRACH detection window of the base station can adjust the position of the detection window according to a forward offset to ensure that the PDP peak value can fall into a correct detection window; however, when the negative timing offset existing in the link is large, there is a case where the forward offset of the base station detection window and the actual TA of the link do not match. Fig. 3 is a schematic diagram of a PRACH detection Window provided in the present invention, as shown in fig. 3, where a negative time offset of a link causes a PDP peak to fall into a Window ID-1 preceding a correct detection Window ID, a correct link TA is denoted as TA in the figure, and a TA that can be actually estimated is denoted as TA' in the figure, where a correct preamble ID and a link TA cannot be detected. The base station cannot ensure that the forward adjustment amount of the detection window is matched with the actual condition of the link, so that the condition cannot be avoided.
In order to overcome the above-mentioned drawbacks of the related art, the present invention provides a method, an apparatus, and an electronic device for determining a link time offset. The method, the device and the electronic equipment for determining the link time offset provided by the invention are exemplarily described below with reference to fig. 4 to 10.
Fig. 4 is a flow chart of a method for determining link time offset according to the present invention, as shown in fig. 4, where the method includes:
step 400, determining a first preamble identification and a first timing advance based on the received preamble sequence;
step 410, determining the first timing advance;
step 420, under the condition that the first timing advance is determined to be greater than 0 and greater than a threshold, determining that a current link has negative timing offset, determining that the first preamble identifier and the first timing advance are both incorrect, correcting the first preamble identifier to obtain a second preamble identifier, and correcting the first timing advance to obtain a second timing advance.
The method for determining the link time offset according to the embodiment of the present invention may be applied to a network side, for example, a base station. The technical scheme of the embodiment of the invention is described in detail below by taking a method for determining the link time offset provided by the invention as an example.
Specifically, in order to overcome the defect that in the related art, when the negative timing bias exists in a link, a correct preamble identifier and a timing advance cannot be detected, the method and the device for determining the preamble identifier and the timing advance determine the first preamble identifier and the first timing advance based on a received preamble sequence, judge the magnitude of the first timing advance, determine that the first preamble identifier and the first timing advance are incorrect under the condition that the first timing advance is determined to be greater than 0 and greater than a threshold value, correct the first preamble identifier and the first timing advance, obtain a second preamble identifier and the second timing advance, and improve the accuracy of correctly detecting the preamble identifier and the timing advance by a base station, thereby improving the probability of success of random access.
Optionally, the base station may blindly detect a preamble sequence sent by the UE in a time-frequency domain range of a random access signal configured by the cell, to obtain a first preamble identifier (first preamble ID) and a first timing advance (first TA).
Optionally, after the base station obtains the first preamble ID and the first TA, the size of the first TA may be determined, and if it is determined that the first TA is greater than 0 and greater than a predetermined threshold, it is determined that the current link has a negative time offset, and the determined existence of the negative time offset is greater, which may cause mismatching between the forward offset of the base station detection window and the actual condition of the link, and further it is determined that the obtained first preamble ID and the first TA are incorrect, and correction needs to be performed on the first preamble ID and the first TA, so as to obtain correct detection results (that is, the second preamble identifier (second preamble ID) and the second timing advance (second TA)).
It can be understood that, in the embodiment of the present invention, by determining the size of the first TA, and correcting the first preamble ID and the first TA when the first TA is determined to be greater than 0 and greater than the predetermined threshold, that is, when the first TA is determined to be a larger positive value, the condition that the forward offset of the base station detection window does not conform to the actual condition of the current link, which results in the occurrence of a preamble ID and TA detection error can be avoided.
According to the method for determining the time offset of the link, the first preamble mark and the first timing advance are determined based on the received preamble sequence, the size of the first timing advance is further judged, and under the condition that the first timing advance is determined to be greater than 0 and greater than the threshold value, the first preamble mark and the first timing advance are determined to be incorrect, and the first preamble mark and the first timing advance are corrected, so that the second preamble mark and the second timing advance are obtained, the accuracy that the base station correctly detects the preamble mark and the timing advance can be improved, and the probability of success of random access is improved.
Optionally, the determining the first preamble identity and the first timing advance based on the received preamble sequence includes:
determining a cyclic shift length of the preamble sequence, and determining a first detection window based on the cyclic shift length of the preamble sequence, wherein the first detection window comprises a plurality of first sub-detection windows, and each first sub-detection window respectively has a corresponding first identifier and a first starting position;
forward adjusting the first detection window to obtain a second detection window, wherein the second detection window comprises a plurality of second sub-detection windows, and each second sub-detection window is provided with a corresponding second mark and a second starting position respectively;
Determining a time domain index of an effective path corresponding to a peak value of a power delay spectrum PDP of the preamble sequence, determining a target second sub-detection window of which the time domain index is positioned in the second detection window, and taking a target second identifier corresponding to the target second sub-detection window as the first preamble identifier;
determining a target first starting position corresponding to a target first sub-detection window in the first detection window, wherein a target first identifier corresponding to the target first sub-detection window is equal to the target second identifier;
and taking the difference value between the time domain index and the first starting position of the target as the first timing advance.
Specifically, in the embodiment of the present invention, in order to determine the first preamble identifier and the first timing advance based on the received preamble sequence, the cyclic shift length of the received preamble sequence may be first determined, and based on the cyclic shift length of the preamble sequence, a first detection window is determined, where the first detection window includes a plurality of first sub-detection windows, and each first sub-detection window has a corresponding first identifier and a first starting position respectively; further, forward adjustment is carried out on the first detection window, a second detection window is obtained, the second detection window comprises a plurality of second sub-detection windows, and each second sub-detection window is provided with a corresponding second mark and a second starting position respectively; further determining a time domain index of an effective path corresponding to a peak value of a power delay spectrum PDP of the received preamble sequence, determining a target second sub-detection window of which the time domain index is positioned in a second detection window, and taking a target second identifier corresponding to the target second sub-detection window as a first preamble identifier; then determining a target first starting position corresponding to a target first sub-detection window in the first detection window, wherein a target first identifier corresponding to the target first sub-detection window is equal to a target second identifier; and further taking the difference value between the time domain index of the effective diameter corresponding to the peak value of the PDP and the first starting position of the target as a first timing advance.
It can be understood that in the embodiment of the present invention, the first detection windows are adjusted in the forward direction to obtain the second detection windows, that is, the starting positions of each first sub-detection window in the first detection windows are adjusted in the forward direction, and the intervals between the starting positions are unchanged, so that the second detection windows can be obtained, and the number of the second sub-detection windows in the second detection windows is equal to the number of the first sub-detection windows in the first detection windows, and the second sub-detection windows and the first sub-detection windows with the same identifier are in one-to-one correspondence.
It should be noted that, the cyclic shift length of the preamble sequence is a parameter configured by a higher layer, and may be obtained by looking up a table according to the protocol 38.211.
Optionally, in the embodiment of the present invention, the base station determines the first preamble ID and the first TA based on the received preamble sequence, including the following steps (1) - (5):
(1) The base station blindly detects the received preamble sequence and calculates the PDP of the preamble sequencePower, obtain index of PDP peak effective diameter in time domain；
(2) Based on cyclic shift length of preamble sequenceCalculating a first detection window->，/>Comprises 64 first sub-detection windows, and the first identification ID corresponding to the first sub-detection windows is marked as +. >，/>The first starting position corresponding to each first sub-detection window is marked as +.>The method comprises the steps of carrying out a first treatment on the surface of the And then (2) is in charge of>Second detection window obtained after forward adjustment>Similarly, ->Comprises 64 second sub-detection windows, the corresponding second identification ID is marked as +.>，The second start position corresponding to each second sub-detection window is marked as +.>；
(3) Using a second detection windowDetermining a first preamble ID;
specifically, the base station detectsTarget second identifier corresponding to target second sub-detection window in second detection window>Obtaining a first preamble ID, namely: />；
(4) In the first detection windowA first initial position of the target corresponding to the first sub-detection window of the target is determined；
Specifically, in the first detection windowIs determined to satisfy->And determining the first start position of the target corresponding to the first sub-detection window of the target>；
(5) Calculation ofAnd the target first starting position determined in step (4)>Is the difference of (2)：/>The difference is the first TA.
Optionally, the correcting the first timing advance to obtain a second timing advance includes:
determining the length of the preamble sequence, the number of points of fast Fourier transform FFT (fast Fourier transform) performed on the preamble sequence by a receiving end, and the resolution of each path corresponding to the PDP;
And correcting the first timing advance based on the first timing advance, the length of the preamble sequence, the cyclic shift length of the preamble sequence, the number of points of the FFT, and the resolution to obtain the second timing advance.
Specifically, in the embodiment of the present invention, in order to correct the first timing advance to obtain the second timing advance, the base station may first determine the length of the received preamble sequence, the number of points of the fast fourier transform FFT performed on the preamble sequence by the base station (receiving end), and the resolution of each path corresponding to the PDP, and then correct the first timing advance based on the first timing advance, the length of the preamble sequence, the cyclic shift length of the preamble sequence, the number of points of the FFT, and the resolution of each path corresponding to the PDP to obtain the second timing advance.
Optionally, the correcting the first timing advance based on the first timing advance, the length of the preamble sequence, the cyclic shift length of the preamble sequence, the number of points of the FFT, and the resolution, to obtain the second timing advance includes:
Correcting the first timing advance based on the following formula to obtain the second timing advance:
；
wherein ,representing said second timing advance,/v>Representing the first timing advance, +.>Representing the length of the preamble sequence, +.>Representing the cyclic shift length of said preamble sequence, < >>Points representing the FFT,>representing the resolution.
It can be understood that, in the embodiment of the present invention, the first timing advance is corrected based on the first timing advance, the length of the preamble sequence, the cyclic shift length of the preamble sequence, the number of FFT points, and the resolution of each path corresponding to the PDP, so that the occurrence of TA detection errors caused by that the forward offset of the base station detection window does not conform to the actual situation of the current link can be avoided.
Optionally, the correcting the first preamble identifier to obtain a second preamble identifier includes:
and adding 1 to the first preamble identifier to obtain the second preamble identifier.
Specifically, in the embodiment of the invention, under the condition that the first lead code identifier is determined to be incorrect, the first lead code identifier can be added with 1 to obtain the second lead code identifier, so that correction of the first lead code identifier is realized, and the condition that the preamble ID detection error is caused because the forward offset of the base station detection window does not accord with the actual condition of the current link can be avoided.
It should be noted that, because the negative time offset of the link may cause the PDP peak value to fall into the previous window of the correct detection window, so that the first preamble identifier obtained by the base station is incorrect, the embodiment of the present invention implements correction of the first preamble identifier by adding 1 to the first preamble identifier.
Optionally, before the determining the size of the first timing advance, the method further includes:
determining the length of the preamble sequence, the cyclic shift length of the preamble sequence and the number of points of fast Fourier transform FFT (fast Fourier transform) performed on the preamble sequence by a receiving end;
the threshold is determined based on a length of the preamble sequence, a cyclic shift length of the preamble sequence, and a number of points of the FFT.
Specifically, in the embodiment of the present invention, before determining the size of the first timing advance, the base station may first calculate the threshold value of the TA, and specifically may determine the threshold value of the TA based on the length of the preamble sequence, the cyclic shift length of the preamble sequence, and the number of points of the fast fourier transform FFT performed on the preamble sequence by the base station (receiving end).
Optionally, the determining the threshold value based on the length of the preamble sequence, the cyclic shift length of the preamble sequence, and the number of points of the FFT includes:
the threshold value is determined based on the following formula:
；
wherein ,representing the threshold value,/->Representing the length of the preamble sequence, +.>Representing the preambleCyclic shift length of code sequence,/>Points representing the FFT,>is a coefficient and->，/>To round down the symbol.
It should be noted that, in the embodiment of the present invention, based on the length of the preamble sequence, the cyclic shift length of the preamble sequence, and the number of points of the fast fourier transform FFT performed on the preamble sequence by the receiving end, a threshold value of TA is determined, and then the size of the first TA is determined based on the threshold value, where it is determined that the first TA is greater than 0 and greater than the threshold value, a larger negative time offset exists in the current link, and at this time, there is a situation that the forward offset of the base station detection window and the actual link of the link are not matched, so that it is determined that the obtained first preamble ID and the first TA are incorrect, and correction needs to be performed on the obtained first preamble ID and the first TA to obtain a correct second preamble ID and a second TA, thereby improving the accuracy of correctly detecting the preamble ID and the TA by the base station.
Optionally, the method for determining the link time offset provided by the embodiment of the invention further includes:
under the condition that the first timing advance is less than 0, determining that a current link has negative timing offset, and determining that the first preamble identifier and the first timing advance are correct;
and under the condition that the first timing advance is larger than 0 and smaller than the threshold value, determining that the current link has timing offset, and determining that the first preamble identification and the first timing advance are correct.
Specifically, in the embodiment of the present invention, after determining the size of the first timing advance, if it is determined that the first timing advance is less than 0, it is determined that a current link has a negative timing offset, but in this case, the negative timing offset of the current link is smaller, and a PDP peak value of the preamble sequence still falls into a correct PRACH detection window, so that it is determined that both the obtained first preamble identifier and the first timing advance are correct, and correction is not required; if the first timing advance is determined to be greater than 0 and smaller than the predetermined threshold, determining that the current link has timing offset, wherein the forward offset of the detection window does not affect the detection of the PRACH, and the PDP peak effective diameter of the preamble sequence can fall into a correct detection window, so that the first preamble identification and the first timing advance obtained by determination are both correct and correction is not needed.
Fig. 5 is a schematic flow chart of determining the first timing advance, as shown in fig. 5, in the embodiment of the present invention, first a TA threshold value and a link first TA are calculated, and then the calculated first TA is determined twice by a positive value and a negative value, and when it is determined that the first TA is smaller than 0 or the first TA is larger than 0 but the first TA is smaller than the TA threshold value, it is determined that both the first preamble ID and the first TA are correct, and correction is not required, so that the first preamble ID is directly assigned to the second preamble ID, the first TA is assigned to the second TA, and then the second preamble ID and the second TA are output; however, if it is determined that the first TA is greater than 0 and greater than the TA threshold, and the first preamble ID and the first TA are both incorrect, the second preamble ID and the second TA need to be calculated according to the first preamble ID and the first TA, respectively, and then the calculated second preamble ID and second TA are output.
It can be understood that the embodiment of the invention can solve the problem that the effective diameter of the PDP peak value caused by larger negative time bias in the link does not fall into a correct detection window, so that the error preamble ID and the link TA are detected; according to the result of the twice judgment of the first TA, the second preamble ID and the second TA are determined, and under the condition that the effective diameter of the PDP peak value falls into an error detection window, the correct preamble ID and TA can still be obtained, so that the accuracy of correctly detecting the preamble ID and TA by the base station can be improved, and the probability of success of random access is improved.
Specifically, in the embodiment of the present invention, determining the link time offset by determining the size of the first TA may include the following steps (1) - (3):
(1) Calculating a threshold value of the link TA;
(2) Judging the size of the first TA;
(2.1) for the case where the first TA is less than 0:
FIG. 6 is a diagram showing the effective diameter corresponding to the peak value of PDP falling into the detection window under the condition that the first timing advance is less than 0, as shown in FIG. 6, when there is a negative timing offset in the link, and a second detection windowThe forward offset N of (the detection window of the second row in the figure) is matched with the actual condition of the link, the effective diameter of the PDP peak value can fall into a correct detection window, so that the first preamble ID and the first TA detected by the base station are correct, and for the condition, the first preamble ID and the first TA are respectively assigned to a second preamble ID and a second TA, and the second preamble ID and the second TA are output;
(2.2) for the case where the first TA is greater than or equal to 0 and less than or equal to the threshold value of TA:
FIG. 7 is a diagram showing that the effective diameter corresponding to the peak value of PDP falls into the detection window under the condition that the first timing advance is greater than 0 but less than the threshold value, as shown in FIG. 7, when there is timing deviation in the link, the second detection window of the base station The forward offset N (of the detection window of the second row in the figure) does not affect the detection of the PRACH, and the effective diameter of the PDP peak still falls into the correct detection window, so that the first preamble ID and the first TA detected by the base station are both correct, and in this case, the first preamble ID and the first TA are assigned to the second preamble ID and the second TA, respectively, and the second preamble ID and the second TA are output;
(2.3) for the case where the first TA is greater than 0 and greater than the threshold value of TA:
FIG. 8 is a schematic diagram showing that the effective diameter corresponding to the peak value of the PDP falls into the detection window under the condition that the first timing advance is greater than the threshold value, as shown in FIG. 8, when a larger negative timing offset exists in the link, the base station detects the second detection windowThe forward offset N (of the detection window of the second row in the figure) does not match the link situation, in which case the second detection window is used +.>Detecting PDP peak effective diameter index +.>The PRACH detection result is affected by the negative time offset, and the detected first preamble ID and first TA are incorrect and the incorrect detection result needs to be corrected;
(2.3.1) correcting the first preamble ID if the threshold of TA is exceeded;
As can be seen from fig. 8, the detected first preamble ID is 1 less than the actual preamble ID, and 1 adding operation is required to the calculated first preamble ID, and the corrected preamble ID is denoted as the second preamble ID, that is, the second preamble id=the first preamble id+1;
(2.3.2) recalculating the first TA if the threshold of the TA is exceeded;
based on the formula，/>Recording the recalculated TA as a second TA;
(3) And outputting the second preamble ID and the second TA.
The method for determining the link time offset provided by the invention is described by a specific embodiment:
in the case that the first TA is less than 0, the method specifically includes the following steps 1 to 14:
step 1, a base station blindly detects PRACH signals sent by UE in a time-frequency domain range of random access signals configured by a cell to obtain preamble time domain data;
step 2, the base station demaps the detected preamble time domain data and then performs FFT (fast Fourier transform) to convert the data into preamble frequency domain data;
step 3, performing conjugate multiplication on preamble frequency domain data and a local root sequence, performing IFFT (inverse fast Fourier transform) to convert the preamble frequency domain data and the local root sequence into time domain data, and obtaining PDP power;
step 4, combining the PDP power to obtain the index of the effective diameter of the PDP peak in the time domain；
Step 5, according to the cyclic shift length of the preamble sequence Calculating a first detection window->；
Specifically, first according to the base station at that timeFor->Proportional conversion is carried out, i.e. the actual cyclic shift amount of the base station is +.>I.e. the window length of the sub-detection window; base station first detection window->Comprises 64 first sub-detection windows, each of which is arranged in sequence and has a unique ID, which is marked +.>，The starting position of each first sub-detection window is marked as +.>As shown in table 1:
TABLE 1 ID and starting position of the first detection Window
Step 6, for the first detection windowAnd the start positions of the 64 first sub-detection windows comprised therein +.>Forward direction adjustment is performed, the interval between the initial positions is unchanged, and a second detection window is obtained>And the start position of the sub-detection window (second sub-detection window), wherein +_in the second detection window>Also comprising 64 sub-detection windows;
since there is no link TA information, the setting value N is used as the forward offset of the first detection window at this time to match the possible negative time offset of the link, and the adjustment of the forward offset is N #, wherein />Representing a negative integer), a second detection window +.>The ID corresponding to each second sub-detection window in (1) is marked as +.>And the corresponding start position of each second sub-detection window is marked as +.>As shown in table 2:
TABLE 2 ID and starting position of the second detection Window
It should be noted that, the sub detection windows with the same ID in the first detection window and the second detection window are in one-to-one correspondence;
step 7, utilizing a second detection windowDetermining a first preamble ID;
specifically, the time domain index of the effective diameter of the PDP peak is noted asThe base station uses the second detection windowDetecting preamble ID, namely: the base station detects +.>Sub-detection window of the second detection window being located +.>Obtaining the preamble ID selected by the UE, and recording the preamble ID as a first preamble ID, namely: />；
Step 8, in the first detection windowFind the start position of the sub-detection window +.>；
Specifically, in the first detection windowIs determined to satisfy->And determines the corresponding start position +.>；
Step 9, calculatingAnd the detection window start position determined in step 8 +.>Difference of->：/>At this time->；
Step 10, determining the resolution of the first TA(unit: ts (sampling interval));
in particular, resolution of the first TANamely, the number of sampling points corresponding to each path of the PDP at the base station is equal to the ratio of the number of FFT (fast Fourier transform) at the receiving and transmitting ends, namely:
；
wherein ,is the number of sending end FFT, ++>Is the number of the receiving end FFT;
step 11, calculating a first TA (unit: ts): ；
Step 12, judging the size of the first TA to obtain that the first TA is smaller than 0, and determining that the detected preamble ID and the calculated link TA are correct at the moment;
step 13, assigning the first preamble ID and the first TA to the second preamble ID and the second TA respectively;
step 14, outputting the second preamble ID and the second TA.
And (II) if the first TA is greater than 0 and greater than the TA threshold, the method specifically comprises the following steps 1-17:
step 1, a base station blindly detects PRACH signals sent by UE in a time-frequency domain range of random access signals configured by a cell to obtain preamble time domain data;
step 2, the base station demaps the detected preamble time domain data and then performs FFT (fast Fourier transform) to convert the data into preamble frequency domain data;
step 3, performing conjugate multiplication on preamble frequency domain data and a local root sequence, performing IFFT (inverse fast Fourier transform) to convert the preamble frequency domain data and the local root sequence into time domain data, and obtaining PDP power;
step 4, combining the PDP power to obtain the index of the effective diameter of the PDP peak in the time domain；
Step 5, according to the cyclic shift length of the preamble sequenceCalculating a first detection window->；
Specifically, first according to the base station at that timeFor->Proportional conversion is carried out, i.e. the actual cyclic shift amount of the base station is +.>I.e. the window length of the sub-detection window; base station first detection window- >Comprises 64 first sub-detection windows, each of which is arranged in sequence and has a unique ID, which is marked +.>，The starting position of each first sub-detection window is marked as +.>As shown in table 1 above;
step 6, for the first detection windowAnd the start positions of the 64 first sub-detection windows comprised therein +.>Forward direction adjustment is performed, the interval between the initial positions is unchanged, and a second detection window is obtained>And the start position of the sub-detection window (second sub-detection window), wherein +_in the second detection window>Also comprising 64 sub-detection windows;
since there is no link TA information at this time, the set value N is taken as the forward offset of the first detection window at this time to match the negative time offset possibly existing in the link, and recordThe adjustment amount of forward offset is N #, wherein />Representing a negative integer), a second detection window +.>The ID corresponding to each second sub-detection window in (1) is marked as +.>And the corresponding start position of each second sub-detection window is marked as +.>As shown in table 2 above;
step 7, utilizing a second detection windowDetermining a first preamble ID;
specifically, the time domain index of the effective diameter of the PDP peak is noted asThe base station uses the second detection windowDetecting preamble ID, namely: the base station detects +.>Sub-detection window of the second detection window being located +. >Obtaining the preamble ID selected by the UE, and recording the preamble ID as a first preamble ID, namely: />；
Step 8, in the first detection windowFind the start position of the sub-detection window +.>；
Specifically, in the first detection windowIs determined to satisfy->And determines the corresponding start position +.>；
Step 9, calculatingAnd the detection window start position determined in step 8 +.>Difference of->：/>At this time->；
Step 10, determining the resolution of the first TA(unit: ts);
in particular, resolution of the first TANamely, the number of sampling points corresponding to each path of the PDP at the base station is equal to the ratio of the number of FFT (fast Fourier transform) at the receiving and transmitting ends, namely:
；
wherein ,is the number of sending end FFT, ++>Is the number of the receiving end FFT;
step 11, calculating a first TA (unit: ts):；
step 12, through the formulaCalculating a TA threshold value;
step 13, judging the size of the first TA to obtain that the first TA is larger than 0;
step 14, reusing TA thresholdPerforming secondary judgment on the first TA larger than 0, wherein the first TA exceeds a threshold value +.>Namely, the preamble ID and TA are considered not to be correctly detected, so that the error detection result needs to be corrected;
step 15, correcting the first preamble ID under the condition that the TA threshold value is exceeded;
Specifically, the detected first preamble ID is 1 less than the actual preamble ID, 1 adding operation is required to be performed on the calculated first preamble ID, and the corrected preamble ID is recorded as a second preamble ID, that is, the second preamble id=the first preamble id+1;
step 16, recalculating the first TA under the condition that the TA threshold value is exceeded;
based on the formula，/>Recording the recalculated TA as a second TA;
and step 17, outputting the second preamble ID and the second TA.
It can be understood that in the above embodiment (where the first TA is greater than 0 and greater than the threshold), the starting position of the PRACH detection window of the base station is first adjusted forward according to the related technology, but because the forward adjustment amount of the detection window is not matched with the actual condition of the link, the forward adjustment does not play a role, and the larger negative time offset existing in the link still causes the effective diameter of the PDP peak to fall into the previous detection window of the correct detection window, and at this time, the correct preamble ID and link TA cannot be obtained; however, in the embodiment of the present invention, the TA is secondarily determined based on the calculated TA threshold, and according to the determination result, when the base station determines that both the first preamble ID and the first TA at this time are incorrect, the first preamble ID that is incorrect is further corrected, and the first TA that is incorrect is recalculated, so that the correct second preamble ID and second TA are finally obtained.
According to the method for determining the time offset of the link, the first preamble mark and the first timing advance are determined based on the received preamble sequence, the size of the first timing advance is further judged, and under the condition that the first timing advance is determined to be greater than 0 and greater than the threshold value, the first preamble mark and the first timing advance are determined to be incorrect, and the first preamble mark and the first timing advance are corrected, so that the second preamble mark and the second timing advance are obtained, the accuracy that the base station correctly detects the preamble mark and the timing advance can be improved, and the probability of success of random access is improved.
The link time offset determining device provided by the invention is described below, and the link time offset determining device described below and the link time offset determining method described above can be referred to correspondingly.
Fig. 9 is a schematic structural diagram of a link time offset determining apparatus provided in the present invention, as shown in fig. 9, the apparatus includes: a first determination module 910, a judgment module 920, and a second determination module 930; wherein:
the first determining module 910 is configured to determine, based on the received preamble sequence, a first preamble identity and a first timing advance;
The judging module 920 is configured to judge the size of the first timing advance;
the second determining module 930 is configured to determine that, when it is determined that the first timing advance is greater than 0 and greater than a threshold, a negative timing offset exists in the current link, determine that both the first preamble identifier and the first timing advance are incorrect, correct the first preamble identifier to obtain a second preamble identifier, and correct the first timing advance to obtain a second timing advance.
The link time offset determining device provided by the invention determines the first preamble mark and the first timing advance based on the received preamble sequence, further judges the magnitude of the first timing advance, determines that the first preamble mark and the first timing advance are incorrect under the condition that the first timing advance is determined to be greater than 0 and greater than a threshold value, corrects the first preamble mark and the first timing advance to obtain the second preamble mark and the second timing advance, and can improve the accuracy that the base station correctly detects the preamble mark and the timing advance, thereby improving the probability of success of random access.
It should be noted that, the device for determining the link time offset provided by the embodiment of the present invention can implement all the method steps implemented by the embodiment of the method for determining the link time offset, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the embodiment of the method in the embodiment are omitted.
Fig. 10 is a schematic diagram of an entity structure of an electronic device according to the present invention, as shown in fig. 10, the electronic device may include: a processor 1010, a communication interface (Communications Interface) 1020, a memory 1030, and a communication bus 1040, wherein the processor 1010, the communication interface 1020, and the memory 1030 communicate with each other via the communication bus 1040. Processor 1010 may invoke logic instructions in memory 1030 to perform the method for determining link time offset provided by the methods described above, including:
determining a first preamble identity and a first timing advance based on the received preamble sequence;
judging the size of the first timing advance;
and under the condition that the first timing advance is greater than 0 and greater than a threshold value, determining that the current link has negative timing offset, determining that the first preamble identifier and the first timing advance are incorrect, correcting the first preamble identifier to obtain a second preamble identifier, and correcting the first timing advance to obtain a second timing advance.
Further, the logic instructions in the memory 1030 described above may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform a method of determining a link time offset provided by the above methods, the method comprising:
Determining a first preamble identity and a first timing advance based on the received preamble sequence;
judging the size of the first timing advance;
and under the condition that the first timing advance is greater than 0 and greater than a threshold value, determining that the current link has negative timing offset, determining that the first preamble identifier and the first timing advance are incorrect, correcting the first preamble identifier to obtain a second preamble identifier, and correcting the first timing advance to obtain a second timing advance.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the above-described method of determining link time bias, the method comprising:
determining a first preamble identity and a first timing advance based on the received preamble sequence;
judging the size of the first timing advance;
and under the condition that the first timing advance is greater than 0 and greater than a threshold value, determining that the current link has negative timing offset, determining that the first preamble identifier and the first timing advance are incorrect, correcting the first preamble identifier to obtain a second preamble identifier, and correcting the first timing advance to obtain a second timing advance.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for determining a link time offset, comprising:
determining a first preamble identity and a first timing advance based on the received preamble sequence;
judging the size of the first timing advance;
under the condition that the first timing advance is greater than 0 and greater than a threshold value, determining that a current link has negative timing offset, determining that the first preamble identifier and the first timing advance are incorrect, correcting the first preamble identifier to obtain a second preamble identifier, and correcting the first timing advance to obtain a second timing advance;
Before the determining the size of the first timing advance, the method further includes:
determining the length of the preamble sequence, the cyclic shift length of the preamble sequence and the number of points of fast Fourier transform FFT (fast Fourier transform) performed on the preamble sequence by a receiving end;
the threshold is determined based on a length of the preamble sequence, a cyclic shift length of the preamble sequence, and a number of points of the FFT.
2. The method of determining a link time offset according to claim 1, wherein the determining a first preamble identity and a first timing advance based on the received preamble sequence comprises:
determining a cyclic shift length of the preamble sequence, and determining a first detection window based on the cyclic shift length of the preamble sequence, wherein the first detection window comprises a plurality of first sub-detection windows, and each first sub-detection window respectively has a corresponding first identifier and a first starting position;
forward adjusting the first detection window to obtain a second detection window, wherein the second detection window comprises a plurality of second sub-detection windows, and each second sub-detection window is provided with a corresponding second mark and a second starting position respectively;
Determining a time domain index of an effective path corresponding to a peak value of a power delay spectrum PDP of the preamble sequence, determining a target second sub-detection window of which the time domain index is positioned in the second detection window, and taking a target second identifier corresponding to the target second sub-detection window as the first preamble identifier;
determining a target first starting position corresponding to a target first sub-detection window in the first detection window, wherein a target first identifier corresponding to the target first sub-detection window is equal to the target second identifier;
and taking the difference value between the time domain index and the first starting position of the target as the first timing advance.
3. The method for determining a link time offset according to claim 2, wherein correcting the first timing advance to obtain a second timing advance comprises:
determining the length of the preamble sequence, the number of points of fast Fourier transform FFT (fast Fourier transform) performed on the preamble sequence by a receiving end, and the resolution of each path corresponding to the PDP;
and correcting the first timing advance based on the first timing advance, the length of the preamble sequence, the cyclic shift length of the preamble sequence, the number of points of the FFT, and the resolution to obtain the second timing advance.
4. The method of determining a link time offset according to claim 3, wherein correcting the first timing advance based on the first timing advance, a length of the preamble sequence, a cyclic shift length of the preamble sequence, a number of points of the FFT, and the resolution to obtain the second timing advance comprises:
correcting the first timing advance based on the following formula to obtain the second timing advance:
；
wherein ,representing said second timing advance,/v>Representing the first timing advance, +.>Representing the length of the preamble sequence, +.>Representing the cyclic shift length of said preamble sequence, < >>Points representing the FFT,>representing the resolution.
5. The method for determining the link time offset according to claim 1, wherein correcting the first preamble identifier to obtain a second preamble identifier comprises:
and adding 1 to the first preamble identifier to obtain the second preamble identifier.
6. The method according to claim 1, wherein the determining the threshold value based on the length of the preamble sequence, the cyclic shift length of the preamble sequence, and the number of points of the FFT includes:
The threshold value is determined based on the following formula:
；
wherein ,representing the threshold value,/->Representing the length of the preamble sequence, +.>Representing the cyclic shift length of said preamble sequence, < >>Points representing the FFT,>is a coefficient, and，/>to round down the symbol.
7. The method for determining a link time offset according to any one of claims 1 to 6, further comprising:
under the condition that the first timing advance is less than 0, determining that a current link has negative timing offset, and determining that the first preamble identifier and the first timing advance are correct;
and under the condition that the first timing advance is larger than 0 and smaller than the threshold value, determining that the current link has timing offset, and determining that the first preamble identification and the first timing advance are correct.
8. A link time offset determining apparatus, comprising:
a first determining module, configured to determine a first preamble identifier and a first timing advance based on the received preamble sequence;
the judging module is used for judging the size of the first timing advance;
the second determining module is used for determining that the current link has negative timing offset and determining that the first preamble identifier and the first timing advance are incorrect under the condition that the first timing advance is greater than 0 and greater than a threshold value, correcting the first preamble identifier to obtain a second preamble identifier and correcting the first timing advance to obtain a second timing advance;
The judging module is configured to, before the judging module is configured to judge the size of the first timing advance, further:
determining the length of the preamble sequence, the cyclic shift length of the preamble sequence and the number of points of fast Fourier transform FFT (fast Fourier transform) performed on the preamble sequence by a receiving end;
the threshold is determined based on a length of the preamble sequence, a cyclic shift length of the preamble sequence, and a number of points of the FFT.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of determining the link time bias according to any of claims 1 to 7 when executing the program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310738716.0A CN116506968B (en) | 2023-06-21 | 2023-06-21 | Link time offset determination method and device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310738716.0A CN116506968B (en) | 2023-06-21 | 2023-06-21 | Link time offset determination method and device and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116506968A CN116506968A (en) | 2023-07-28 |
| CN116506968B true CN116506968B (en) | 2023-11-03 |
Family
ID=87320475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310738716.0A Active CN116506968B (en) | 2023-06-21 | 2023-06-21 | Link time offset determination method and device and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116506968B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101355383A (en) * | 2008-09-10 | 2009-01-28 | 中兴通讯股份有限公司 | Signal detection method for stochastic access channel |
| CN107801240A (en) * | 2016-09-07 | 2018-03-13 | 中兴通讯股份有限公司 | A kind of method and apparatus for sending, receiving Timing Advance |
| CN109429354A (en) * | 2017-08-31 | 2019-03-05 | 华为技术有限公司 | A kind of accidental access method and terminal |
| CN109788490A (en) * | 2019-03-07 | 2019-05-21 | 武汉虹信通信技术有限责任公司 | Base station range control method and device |
| CN112823550A (en) * | 2018-09-28 | 2021-05-18 | 华为技术有限公司 | Uplink signal transmission method and device |
| CN112929983A (en) * | 2019-12-06 | 2021-06-08 | 中兴通讯股份有限公司 | Access method, device, equipment and medium based on time adjustment quantity |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7613104B2 (en) * | 2006-05-31 | 2009-11-03 | Nokia Corporation | Method, apparatus and computer program product providing synchronization for OFDMA downlink signal |
-
2023
- 2023-06-21 CN CN202310738716.0A patent/CN116506968B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101355383A (en) * | 2008-09-10 | 2009-01-28 | 中兴通讯股份有限公司 | Signal detection method for stochastic access channel |
| CN107801240A (en) * | 2016-09-07 | 2018-03-13 | 中兴通讯股份有限公司 | A kind of method and apparatus for sending, receiving Timing Advance |
| CN109429354A (en) * | 2017-08-31 | 2019-03-05 | 华为技术有限公司 | A kind of accidental access method and terminal |
| CN112823550A (en) * | 2018-09-28 | 2021-05-18 | 华为技术有限公司 | Uplink signal transmission method and device |
| CN109788490A (en) * | 2019-03-07 | 2019-05-21 | 武汉虹信通信技术有限责任公司 | Base station range control method and device |
| CN112929983A (en) * | 2019-12-06 | 2021-06-08 | 中兴通讯股份有限公司 | Access method, device, equipment and medium based on time adjustment quantity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116506968A (en) | 2023-07-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10897744B2 (en) | Uplink synchronization timing deviation determination method and device | |
| EP2723129B1 (en) | Method for determining timing advance, user equipment and base station | |
| CN101295999B (en) | Detection method for accidental precursor access | |
| US8391131B2 (en) | Method for processing the random access transmission in the frequency domain | |
| CN108683482B (en) | Method and device for estimating timing position | |
| EP2207290A1 (en) | Base station device, mobile station, and communication control method | |
| EP1392015A1 (en) | Symbol timing correcting circuit, receiver, symbol timing correcting method, and demodulation processing method | |
| JP6457512B2 (en) | Method and apparatus for estimating signal-to-interference and noise ratio for a random access channel in a wireless network | |
| CN104811972A (en) | Random access channel false alarm control | |
| US20120287874A1 (en) | Frequency offset estimation method, communication apparatus, wireless communication system, and program | |
| WO2011044793A1 (en) | Method, apparatus and system for detecting channel quality | |
| CN112637099B (en) | Method and device for searching peak value in timing synchronization mode | |
| WO2010040264A1 (en) | Apparatus and methods for estimating and correcting frequency offset in lte | |
| CN104641610A (en) | Method and apparatus for estimating frequency errors | |
| CN110881215B (en) | Five-window combined timing advance estimation calibration method and system thereof | |
| CN115002894A (en) | Uplink timing synchronization method, device, equipment and storage medium | |
| CN116506968B (en) | Link time offset determination method and device and electronic equipment | |
| US9503996B2 (en) | Method and apparatus for cell search and synchronization in mobile communication | |
| EP3804248B1 (en) | Radio signal detection | |
| CN116528271B (en) | Method for adaptively adjusting physical random access channel detection window and related equipment thereof | |
| US20230217395A1 (en) | Method, time synchronization method, device, computer program product, and storage medium for an uplink transmission delay estimation | |
| CN111726180B (en) | Preamble signal detection method and device | |
| CN108989261B (en) | Timing synchronization method, device and related equipment of communication system | |
| JP2004158933A (en) | Synchronism tracking system and method therefor | |
| CN116528390A (en) | Equipment access method, terminal equipment, base station, system and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |