CN106301688B - Method for supporting inter-cell joint detection in PRACH anti-interference technology - Google Patents
Method for supporting inter-cell joint detection in PRACH anti-interference technology Download PDFInfo
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- CN106301688B CN106301688B CN201610770800.0A CN201610770800A CN106301688B CN 106301688 B CN106301688 B CN 106301688B CN 201610770800 A CN201610770800 A CN 201610770800A CN 106301688 B CN106301688 B CN 106301688B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/0048—Decoding adapted to other signal detection operation in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03331—Arrangements for the joint estimation of multiple sequences
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Abstract
A method for supporting inter-cell joint detection in a PRACH anti-interference technology, if a local cell A detects interference before an adjacent cell B and triggers a PRACH anti-interference flow, the local cell A needs to select an available PRACH position from frequency domain interference and a frequency domain position outside the PRACH frequency domain position of the adjacent cell B; if the cell A detects interference and triggers a PRACH anti-interference flow in the adjacent cell B, the cell A needs to select an available PRACH position from frequency domain interference and an updated frequency domain position except the PRACH frequency domain position of the adjacent cell B; if two cells detect interference and trigger an anti-interference flow at the same time, the frequency domain position of the current PRACH is respectively made invalid and notified to the opposite side, one of the two cells firstly adjusts, the new PRACH frequency domain position is notified to the opposite side after selection, the opposite side selects the new PRACH frequency domain position by combining the current interference position, the problem that the Prach resource of the adjacent cell is overlapped due to uncontrollable Prach position after the anti-interference function takes effect is effectively solved, and the method has the characteristics of high efficiency and high accuracy.
Description
Technical Field
The invention relates to the technical field of PRACH anti-interference, in particular to a method for supporting inter-cell joint detection in the PRACH anti-interference technology.
Background
The existing PRACH (PHYSICAL random access channel) anti-interference technology is implemented based on single-cell background noise measurement, when pulse interference occurs in a cell coverage area, which is continuous in a time domain or for an uplink subframe of an LTE system, an eNB (evolved node B, evolved base station) may obtain a noise average value of each prb (PHYSICAL RESOURCE BLOCK) in a frequency domain (where a timer may be set by itself) within a period of time through the background noise measurement, when the noise average value of a certain prb is higher than a certain threshold (which may be set by itself), the prb is regarded as an interfered prb, and at this time, anti-interference processing is performed on the prb, and if the prb falls in a RESOURCE location reserved by the PRACH, an anti-interference procedure of the PRACH is triggered.
When at least one prb in the resources reserved by the PRACH is interfered, starting an anti-interference flow of the PRACH, wherein the current anti-interference processing of the PRACH is configured based on the PRACH of a single cell, when the PRACH is interfered, the eNB can automatically change the frequency offset of the PRACH, move the PRACH to the high-frequency direction with a large prb number to the outside of an interference area, and if the high-frequency area outside the interference area is less than 6 prbs, reselect a proper position from the prb 0. After the PRACH frequency offset adjustment is completed, the RRC (radio resource control) layer will update the system information and send out SIB updated paging to request the UE in the cell to update the system information.
By adopting the existing anti-interference scheme, the anti-interference purpose of the PRACH can be effectively realized under the scene that a single cell covers or cells are few (the PRACH positions can be distinguished from the time domain through manual configuration), but when the number of covered cells is large and the PRACH resource positions cannot be thoroughly distinguished from the time domain through manual configuration due to the limited time domain positions, if the same interference exists in a large range in the covered region, the collision condition of the PRACH resource can be caused through the existing implementation scheme, and false detection or missed detection of the PRACH is caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for supporting inter-cell joint detection in a PRACH anti-interference technology, which can effectively solve the problem of PRACH resource overlapping of adjacent cells caused by uncontrollable PRACH positions after an anti-interference function takes effect so as to reduce the occurrence of false detection and missed detection events of the PRACH and has the characteristics of high efficiency and high accuracy.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for supporting inter-cell joint detection in PRACH anti-interference technology comprises the following steps:
if the adjacent cell B does not perform anti-interference of the PRACH frequency domain when the cell A detects interference and triggers the PRACH anti-interference process, the cell A acquires the PRACH frequency domain position of the adjacent cell B, the PRACH positions of the two cells are not overlapped, and the cell A needs to select an available PRACH position from the frequency domain interference and the frequency domain position outside the PRACH frequency domain position of the adjacent cell B;
if the neighboring cell B finishes the anti-interference of the PRACH frequency domain when the cell A detects the interference and triggers the PRACH anti-interference process, and the PRACH frequency domain position of the neighboring cell B is updated, the cell A needs to select an available PRACH position from the frequency domain interference and the frequency domain position outside the PRACH frequency domain position of the updated neighboring cell B;
if the cell A and the adjacent cell B simultaneously detect interference and trigger an anti-interference process, respectively setting the frequency domain position of the current PRACH as invalid and informing the opposite cell, selecting the larger PCI one of the two cells to preferentially select the frequency domain position, informing the new PRACH frequency domain position to the opposite cell after selection, and after the opposite cell obtains the latest PRACH frequency domain position of the preferentially selected cell, selecting the new PRACH frequency domain position by combining the interference position of the current cell.
The method comprises the following steps that the local cell A calculates the PRACH time frequency position of the adjacent cell B according to the acquired PRACH configuration index and frequency offset of the adjacent cell B, and the specific method comprises the following steps:
if the physical cell identification PCI of the cell B is smaller than the PCI of the cell A, calculating a new PRACH frequency domain offset of the cell B, wherein the PRACH time domain position of the cell B depends on a PRACH configuration index, and confirming a PRACH received time domain subframe of the cell B by checking a table of a 3GPP protocol; the cell B obtains the current uplink interference situation through the uplink IOT measured by the current cell B, and confirms whether the PRACH frequency domain position of the current cell B is available or not by judging the interference noise IOT and the PRACH frequency domain offset currently configured by the cell B; if the parameter is available, the PRACH frequency domain offset of the cell B is not required to be adjusted, and the parameter is notified to the cell A; if the interference and the PRACH frequency domain position are overlapped, namely the PRACH frequency domain offset of the currently configured B cell is unavailable, adjusting: and selecting continuous frequency domain positions with the length of 6 PRBs, the IOT of which is lower than the threshold, as new PRACH frequency domain positions of the cell B, informing the PRACH frequency domain deviation value at the moment to the cell A, selecting the used PRACH frequency domain position by the cell A, and obtaining the PRACH frequency domain deviation according to the PRACH frequency domain position.
The frequency domain position of the PRACH of the cell A is set to be invalid before the PRACH is adjusted by the cell A, and the invalid position is used for marking that the PRACH is to be adjusted by the cell A.
Compared with the prior art, the invention has the following beneficial effects:
the invention adds the joint detection between the adjacent cells when the PRACH is adjusted in an anti-interference way on the basis of the prior art, not only carries out the PRACH adjustment of the cell according to the interference condition, but also combines the current PRACH configuration of the adjacent cells, and effectively avoids the problems of PRACH virtual detection and missed detection caused by the collision of PRACH resources after different cells carry out the anti-interference adjustment of the PRACH when the same interference exists in the area.
Even if adjacent cells cannot avoid the PRACH position from the time domain and the coverage area has the same interference in a large range, the anti-interference of the PRACH can be effectively realized, and the condition of PRACH resource collision caused after automatic adjustment is avoided.
The access success rate of the terminals of each cell in an interference state is effectively improved, the network access success rate is ensured, the virtual detection probability of the PRACH among the cells is reduced, the interference of the frequency domain of the PRACH among the cells is reduced, and the stability of the network is ensured.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a method for supporting inter-cell joint detection in PRACH anti-interference technology includes the following specific steps:
because the starting time and the length of the background noise detection timer between cells may be different, when there is interference in the coverage area, the time for different cells to start PRACH interference resistance may also be different, which is described in the following cases:
when the interference position of the cell a is [ X, Y ], the PRACH frequency domain position of the cell a is [ M, N ], the interference position includes the PRACH frequency domain position, at this time, the cell a needs to adjust the frequency domain position of the PRACH, meanwhile, because the neighboring cell B has not detected interference, the neighboring cell B has not performed the interference resistance of the PRACH frequency domain, so the PRACH of the neighboring cell B has interference, so the cell a obtains the PRACH frequency domain position [ P, Q ] of the neighboring cell B, and the PRACH positions of the two cells are not overlapped, at this time, the cell a needs to find a new PRACH position available to the cell a at a position other than the frequency domain interference [ X, Y ] and the PRACH frequency domain position [ P, Q ] of the neighboring cell B.
When the interference position of the cell a is [ X, Y ], the PRACH frequency domain position of the cell a is [ M, N ], the interference position includes the PRACH frequency domain position, at this time, the cell a needs to adjust the frequency domain position of the PRACH, and at the same time, because the neighboring cell B has already done the PRACH frequency offset adjustment at this time, that is, the cell B has already finished the anti-interference of the PRACH frequency domain, it is updated to [ U, V ] from the PRACH frequency domain position [ P, Q ] of the original neighboring cell B, the PRACH of the neighboring cell B is already outside the interference region, at this time, the cell a has obtained the latest PRACH frequency domain position [ U, V ] of the neighboring cell B, and the cell a needs to find the new PRACH position available to the cell a at the frequency domain position outside the PRACH frequency domain positions [ U, V ] of the neighboring cell B and the interference [ X, Y ] at this time.
When the interference position of the cell a is [ X, Y ], the PRACH frequency domain position of the cell a is [ M, N ], the interference position includes the PRACH frequency domain position, at this time, the cell a needs to adjust the frequency domain position of the PRACH, and simultaneously, when the interference position [ S, T ] of the neighboring cell B, the PRACH frequency domain position [ P, Q ] of the neighboring cell B, the interference position includes the PRACH frequency domain position, at this time, the neighboring cell B needs to adjust the frequency domain position of the PRACH.
When two cells simultaneously perform PRACH anti-interference, the frequency domain position of the current PRACH is set to be invalid and is informed to the opposite cell, and the two cells respectively perform new PRACH frequency domain position selection from the frequency domain position of the PRACH with respective interference and the invalid PRACH of the opposite side removed. Since the obtained configuration of the other party is an invalid value, which indicates that the other party is to be adjusted, the party which is adjusted first does not need to consider the configuration of the other party at this time, and only needs to adjust according to the interference situation.
Since any one of the two cells can be adjusted first and the PCI of the adjacent cell is avoided as much as possible in network planning, the one with the larger PCI in the two cells is selected to be adjusted first, and the one with the smaller PCI is triggered again after the adjustment of the other one is completed. At this time, because the PCI of the cell B is smaller than the PCI of the cell a, a new PRACH frequency domain offset of the cell B is calculated first, the PRACH time domain position of the cell B depends on the PRACH configuration index, and the time domain subframe received by the PRACH of the cell B can be confirmed by looking up the table of the 3GPP protocol; the B cell can obtain the current uplink interference situation through the uplink IOT measured by the current B cell, and confirms the PRACH frequency domain position and interference overlap of the current B cell by judging the IOT and the PRACH frequency domain offset currently configured by the B cell, namely the PRACH frequency domain offset of the currently configured B cell is unavailable, and then the adjustment is carried out: selecting continuous frequency domain positions with 6 PRB lengths with the IOT lower than a threshold as new PRACH frequency domain positions of a cell B, informing the new PRACH frequency domain positions [ E, F ] of the cell A, and selecting the new PRACH frequency domain positions by combining the interference position of the current cell A after the cell A obtains the latest PRACH frequency domain position of the cell B.
The LTE frequency domain bandwidth is divided according to the subcarrier bandwidth, and then one PRB is positioned according to each continuous 12 subcarriers and 7 time domain symbols of the frequency domain, so that the 20MHz frequency domain bandwidth is defined as 100 effective PRBs, and the PRBs are numbered from low frequency and are 0-99.
The PRACH reception location is: starting from 0, 6 consecutive PRBs starting from the PRBs after the PRACH frequency domain offset. For example, if the frequency offset value is 15, the offset ranges from 0PRB to 14PRB (i.e. 15 starting from 1), and the PRB starting from 15PRB is the PRB starting from the frequency position of the PRACH.
In the scene, the PRACH configuration is set as an invalid value to avoid the situation that two cells simultaneously acquire the value before the adjustment of the other cell, so that the two cells adjust to the same position.
Claims (3)
1. A method for supporting inter-cell joint detection in PRACH anti-interference technology is characterized by comprising the following steps:
if the adjacent cell B does not perform anti-interference of a PRACH frequency domain when the cell A detects interference and triggers a PRACH anti-interference flow of a physical random access channel, the cell A acquires the PRACH frequency domain position of the adjacent cell B, the PRACH positions of the two cells are not overlapped, and the cell A needs to select an available PRACH position from the frequency domain interference and the frequency domain position except the PRACH frequency domain position of the adjacent cell B;
if the neighboring cell B finishes the anti-interference of the PRACH frequency domain when the cell A detects the interference and triggers the PRACH anti-interference process, and the PRACH frequency domain position of the neighboring cell B is updated, the cell A needs to select an available PRACH position from the frequency domain interference and the frequency domain position outside the PRACH frequency domain position of the updated neighboring cell B;
if the cell A and the adjacent cell B simultaneously detect interference and trigger an anti-interference process, respectively setting the frequency domain position of the current PRACH as invalid and informing the opposite cell, selecting the larger PCI one of the two cells to preferentially select the frequency domain position, informing the new PRACH frequency domain position to the opposite cell after selection, and after the opposite cell obtains the latest PRACH frequency domain position of the preferentially selected cell, selecting the new PRACH frequency domain position by combining the interference position of the current cell.
2. The method for supporting inter-cell joint detection in the PRACH anti-interference technology according to claim 1, wherein the cell a calculates the PRACH time-frequency position of the neighboring cell B according to the acquired PRACH configuration index and frequency offset of the neighboring cell B, and the specific method is as follows:
if the physical cell identification PCI of the cell B is smaller than the PCI of the cell A, calculating a new PRACH frequency domain offset of the cell B, wherein the PRACH time domain position of the cell B depends on a PRACH configuration index, the cell B obtains the current uplink interference condition through the uplink IOT measured by the current cell B, and whether the PRACH frequency domain position of the current cell B is available is determined by judging the interference noise IOT and the PRACH frequency domain offset currently configured by the cell B; if the time domain position is available, the PRACH frequency domain offset of the cell B is not required to be adjusted, and the time domain position is informed to the cell A; if the interference and the PRACH frequency domain position are overlapped, namely the PRACH frequency domain offset of the currently configured B cell is unavailable, adjusting: selecting the frequency domain position of 6 continuous physical resource blocks PRB length with IOT lower than threshold as the new PRACH frequency domain position of the cell B, informing the PRACH frequency domain deviation value of the time to the cell A, selecting the PRACH frequency domain position used by the cell A according to the PRACH frequency domain position, and obtaining the PRACH frequency domain deviation according to the PRACH frequency domain position.
3. The method of claim 1, wherein the frequency domain position of the PRACH of the cell a is set to be invalid before the PRACH adjustment is performed in the cell a, and the method is used to mark that the PRACH adjustment is to be performed in the cell a.
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| CN108307408B (en) * | 2017-01-11 | 2023-03-14 | 中兴通讯股份有限公司 | Detection method, device and base station for recognizing false detection caused by interference |
| CN109104766A (en) * | 2017-06-20 | 2018-12-28 | 大唐移动通信设备有限公司 | A kind of Physical Random Access Channel PRACH anti-interference method and device |
| CN110621079B (en) * | 2018-06-19 | 2021-04-13 | 维沃移动通信有限公司 | Random access resource selection method and terminal equipment |
| CN111436132B (en) | 2019-01-11 | 2024-04-30 | 成都华为技术有限公司 | Random access resource allocation method and device |
| WO2021098570A1 (en) * | 2019-11-20 | 2021-05-27 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for determining prach occasion and terminal device, network device |
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| US20120195298A1 (en) * | 2011-02-01 | 2012-08-02 | Innovative Sonic Corporation | Method and apparatus to avoid in-device coexistence interference in a wireless communication system |
| WO2016008101A1 (en) * | 2014-07-15 | 2016-01-21 | 华为技术有限公司 | Apparatus and method for sending a reference signal |
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