CN115802474A - Method and system for avoiding cell synchronous interference - Google Patents
Method and system for avoiding cell synchronous interference Download PDFInfo
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Abstract
The application provides a method and a system for avoiding cell synchronous interference, which relate to the technical field of wireless communication and comprise the following steps: when the base station meets the triggering condition, the base station monitors and detects the receiving energy level of the available frequency band; when the base station carries out monitoring detection, energy detection is carried out on all alternative synchronous information resource blocks of an available frequency band, and state marking is carried out on the alternative synchronous information resource blocks; the base station selects one alternative synchronization information resource block for sending a main synchronization signal and an auxiliary synchronization signal according to the state mark; the trigger conditions comprise a first sub-trigger condition, a second sub-trigger condition and a third sub-trigger condition; the base station at least meets one of the first sub-triggering condition, the second sub-triggering condition and the third sub-triggering condition. Therefore, by monitoring and detecting the available frequency band, the frequency domain andor the time domain position of the main synchronizing signal and the auxiliary synchronizing signal can be changed rapidly and dynamically, and the communication function of the cell can still operate even if strong interference exists.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and a system for avoiding cell synchronization interference.
Background
With the development of wireless communication technology, the 5G network is the 'infrastructure' of industrial internet, the construction of the 5G network also provides a solid foundation for the development of the vertical industry fusion application, and the fusion applications of 5G + intelligent factories, 5G + intelligent medical treatment, 5G + intelligent education and the like are endless. With the continuous deepening of 5G enabled vertical industry digital transformation, a 5G network is inevitably required to bear more vertical industry requirements, so that the 5G technology is an opportunity of both public networks and private networks. After the 5G technology is widely used in various industries, a plurality of problems are generated in the using process. For example: in a certain region, strong interference caused by overlapping coverage of two private networks or strong electromagnetic interference caused by procedures of some specific industries can cause that a user cannot search a cell of the private network to which the user belongs, cell synchronization cannot be performed, and further communication cannot be performed. For example, the ue cannot perform cell search to obtain cell radio frame synchronization and read system broadcast message, and cannot perform access.
In the prior art, a PLMN (Public Land Mobile Network) places frequency domain bits of a synchronization signal at an upper band or a lower band close to a whole frequency band, so that continuous subcarrier scheduling of a communicating user equipment can be provided, and scheduling efficiency and decoding speed of the user equipment are improved. Usually, the range of the sub-carriers of the synchronization signal is not changed. The frequency domain positions of the Primary Synchronization Signal (PSS), secondary Synchronization Signal (SSS) and Physical Broadcast Channel (PBCH) of the existing 5G cell are all statically configured to change, but once the frequency domain position is strongly interfered by external signals, the ue cannot resolve and identify the Synchronization signals at all.
Disclosure of Invention
In view of this, the present invention provides a method and a system for avoiding cell synchronization interference, so as to avoid cell synchronization interference and enable a communication function of a cell to still operate.
In a first aspect, the present application provides a method for avoiding cell synchronization interference, including:
when a base station meets a trigger condition, the base station monitors and detects the receiving energy level of an available frequency band;
when the base station carries out the monitoring detection, carrying out energy detection on all alternative synchronous information resource blocks of the available frequency band, and carrying out state marking on the alternative synchronous information resource blocks;
the base station selects one of the alternative synchronization information resource blocks according to the state mark, and the alternative synchronization information resource block is used for sending a main synchronization signal and an auxiliary synchronization signal;
the trigger conditions comprise a first sub-trigger condition, a second sub-trigger condition and a third sub-trigger condition;
the first sub-trigger condition is as follows: the base station is in the stage of carrying out periodic monitoring;
the second sub-trigger condition is as follows: the base station receives that the uplink signal error rate of the user equipment is higher than a first threshold value;
the third sub-trigger condition is as follows: the base station receives an interference monitoring command;
the base station meets the triggering condition, which specifically comprises the following steps: the base station at least meets one of the first sub-trigger condition, the second sub-trigger condition and the third sub-trigger condition.
Optionally, wherein:
the monitoring detection method comprises the following steps:
the media access layer obtains monitoring parameters from the wireless resource control layer, wherein the monitoring parameters comprise a monitoring period, sensing signal duration, sensing resource block number and a busy state level value R;
the media access layer informs a physical layer of carrying out interference energy level detection on the resource block;
the physical layer carries out energy detection on each alternative synchronous information resource block, and calculates the energy level value L of each alternative synchronous information resource block x ；
The physical layer combines the energy level value L x Reporting the energy level value to the media access layer, wherein the media access layer obtains the energy level value L according to the energy level value x For each alternative synchronization information resource block, performing a busy-idle status flagRecording;
when L is x >R, marking the alternative synchronization information resource block x as a busy state; when L is x And marking the alternative synchronization information resource block x to be in an idle state when the number is less than or equal to R.
Optionally, wherein:
the base station selects one of the alternative synchronization information resource blocks according to the state mark, and sends a main synchronization signal and an auxiliary synchronization signal, specifically:
if the alternative synchronization information resource block currently used by the base station is in a free state, the current alternative synchronization information resource block is continuously used, and if the alternative synchronization information resource block currently used by the base station is in a busy state, other alternative synchronization information resource blocks are selected;
after the alternative synchronous information resource block is selected, determining the content of each field in the main information block carried by the physical broadcast channel;
and the base station transmits the contents of the primary synchronization signal and the secondary synchronization signal by using the position of the alternative synchronization information resource block.
Optionally, wherein:
if the alternative synchronization information resource block currently used by the base station is in a busy state, selecting other alternative synchronization information resource blocks, specifically:
sequencing the alternative synchronous information resource blocks from low to high according to the energy level value;
selecting the alternative synchronization information resource block with the lowest energy level; or the like, or a combination thereof,
and randomly selecting the alternative synchronization information resource block.
In a second aspect, the present application provides a system for avoiding cell synchronization interference, including: the system comprises a condition determining module, a monitoring and detecting module and a position changing module;
the determining condition module is configured to detect whether the base station meets a trigger condition, where the trigger condition includes a first sub-trigger condition, a second sub-trigger condition, and a third sub-trigger condition; the first sub-trigger condition is as follows: the base station carries out periodic monitoring; the second sub-trigger condition is as follows: the base station receives that the uplink signal error rate of the user equipment is higher than a first threshold value; the third sub-trigger condition is as follows: the base station receives an interference monitoring command;
the monitoring detection module is used for monitoring detection, performing energy detection on all alternative synchronous information resource blocks of the available frequency band of the base station, and performing state marking on the alternative synchronous information resource blocks;
and the position changing module is used for selecting one of the alternative synchronization information resource blocks according to the state mark and sending a main synchronization signal and an auxiliary synchronization signal.
Optionally, wherein:
the monitoring detection module comprises: the device comprises an acquisition parameter module, an interference energy level detection module and a state marking module;
the parameter acquisition module is used for acquiring monitoring parameters, wherein the monitoring parameters comprise a monitoring period, sensing signal duration, sensing resource block number and busy state level value;
the interference energy level detection module is used for detecting the interference energy level of the resource block, detecting the receiving energy of each alternative synchronization information resource block, and calculating the energy level of each alternative synchronization information resource block;
and the state marking module is used for marking the busy and idle states of each alternative synchronous information resource block.
Optionally, wherein:
the relocation module includes: the system comprises a position selecting module, a field information determining module and an information sending module;
the selection position module is configured to determine a busy-idle state of the candidate synchronization information resource block currently used by the base station, and select one of the candidate synchronization information resource blocks in an idle state;
the field information determining module is used for determining the content of each field in the main information block carried by the physical broadcast channel;
and the information sending module is used for sending the contents of the main synchronization signal and the auxiliary synchronization signal by using the position of the alternative synchronization information resource block.
Compared with the prior art, the method and the system for avoiding cell synchronous interference provided by the invention at least realize the following beneficial effects:
the application provides a method and a system for avoiding cell synchronous interference, which comprises the following steps: when the base station meets the triggering condition, the base station monitors and detects the receiving energy level of the available frequency band; when the base station carries out monitoring detection, energy detection is carried out on all alternative synchronous information resource blocks of an available frequency band, and state marking is carried out on the alternative synchronous information resource blocks; the base station selects one alternative synchronization information resource block for sending a main synchronization signal and an auxiliary synchronization signal according to the state mark; the trigger conditions comprise a first sub-trigger condition, a second sub-trigger condition and a third sub-trigger condition; the first sub-trigger condition is: the base station is in the stage of periodic monitoring; the second sub-trigger condition is: the base station receives that the uplink signal error rate of the user equipment is higher than a first threshold value; the third sub-trigger condition is: the base station receives an interference monitoring command; the base station satisfies the triggering condition, which specifically comprises: the base station at least meets one of the first sub-triggering condition, the second sub-triggering condition and the third sub-triggering condition. So set up, through monitoring and detecting the received energy level to available frequency channel, can the frequency domain or the time domain position of dynamic change owner synchronizing signal and supplementary synchronizing signal fast, even strong interference exists, the communication function of district still can operate.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flow chart illustrating a method for avoiding cell synchronization interference;
FIG. 2 is a flow chart of the S10 snoop detection of FIG. 1;
FIG. 3 is a flowchart illustrating the detailed steps of S30 in FIG. 1;
FIG. 4 is a diagram of a system for avoiding cell-synchronized interference;
FIG. 5 is a diagram illustrating an embodiment of a system for avoiding cell-synchronized interference;
fig. 6 is a diagram illustrating another embodiment of a system for avoiding cell-synchronized interference.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the prior art, the PLMN places the frequency domain bits of the synchronization signal at the upper sideband or the lower sideband of the entire frequency band, which can provide continuous subcarrier scheduling for the communicating user equipment, thereby improving the scheduling efficiency and the decoding speed of the user equipment. Usually, the range of the sub-carriers of the synchronization signal is not changed. Although the frequency domain positions of the frame synchronization PSS, SSS and PBCH of the existing 5G cell are changeable, they are statically configured to change, and once the frequency domain positions are strongly interfered by external signals, the user equipment cannot resolve and identify the synchronization signals at all.
In view of this, the present invention provides a method and a system for avoiding cell synchronization interference, so as to avoid cell synchronization interference and enable a communication function of a cell to still operate.
Referring to fig. 1, a flowchart of a method for avoiding cell synchronization interference is shown, and the present application provides a method for avoiding cell synchronization interference, including:
s10, when the base station meets a trigger condition, the base station monitors and detects the receiving energy level of the available frequency band;
s20, when the base station carries out monitoring detection, energy detection is carried out on all alternative synchronous information resource blocks of an available frequency band, and state marking is carried out on the alternative synchronous information resource blocks;
s30, the base station selects one alternative synchronization information resource block according to the state mark, and the alternative synchronization information resource block is used for sending a main synchronization signal and an auxiliary synchronization signal;
the trigger conditions comprise a first sub-trigger condition, a second sub-trigger condition and a third sub-trigger condition; the first sub-trigger condition is: the base station is in the stage of carrying out periodic monitoring; the second sub-trigger condition is: the base station receives that the uplink signal error rate of the user equipment is higher than a first threshold value; the third sub-trigger condition is: the base station receives an interference monitoring command;
the base station meets the triggering condition, which specifically comprises the following steps: the base station at least meets one of the first sub-triggering condition, the second sub-triggering condition and the third sub-triggering condition.
The method comprises the following steps that when a base station meets triggering conditions of monitoring detection, the base station monitors and detects interference conditions of frequency bands which can be used by the base station, the purpose of monitoring and detecting is to determine which alternative synchronization information resource blocks can be used, and signal receiving and sending are not carried out on the alternative synchronization information resource blocks with serious interference; when the base station carries out monitoring detection, carrying out energy detection on all alternative synchronous information resource blocks of an available frequency band, and carrying out state marking on the alternative synchronous information resource blocks; and the base station selects a proper alternative synchronization information resource block according to the state marking information of the alternative synchronization information resource block and sends the main synchronization signal and the auxiliary synchronization signal. According to the arrangement, the base station monitors and detects the available frequency band, when finding that the energy of some alternative synchronous information resource blocks is higher, the base station avoids the alternative synchronous information resource blocks, selects the alternative synchronous information resource blocks with lower energy to receive and transmit signals, can rapidly and dynamically change the frequency domain or time domain position of the main synchronous signal and the auxiliary synchronous signal, and can still operate the communication function of the cell even if strong interference exists.
It should be noted that the trigger condition includes a first sub-trigger condition, a second sub-trigger condition, and a third sub-trigger condition; and when the base station at least meets one of the first sub-triggering condition, the second sub-triggering condition and the third sub-triggering condition, the base station monitors and detects the received energy level of the available frequency band.
Wherein, the first sub-triggering condition is as follows: the base station is in the stage of periodic monitoring; the period T of the periodic listening is configured by the user of the base station. The period T may range from milliseconds to seconds, or minutes, or even hours. The present application provides an alternative embodiment, for example: t is more than or equal to 1ms and less than or equal to 2000ms.
The second sub-trigger condition is: the base station receives that the uplink signal error rate of the user equipment is higher than a first threshold value; the first threshold is configured by a user of the base station.
The third sub-trigger condition is: the base station receives an interference monitoring command; the interference listening command may be from a core network device, an OAM (Operation Administration and Maintenance) program, and the like.
An optional implementation manner provided in the present application is that the base station receives an interference monitoring command from the core network device, that is, the base station meets the trigger condition, and the base station starts monitoring detection.
It should be noted that the user of the base station may be a person, a certain software program device, such as an OAM operation and maintenance management device. The time length of the monitoring detection needs to refer to the detection method of the ISM Band, which is defined by the radio communication bureau of the International telecommunication Union (International Scientific Medical) Band. The meaning of Chinese is Industrial (Industrial), scientific (Scientific) and Medical (Medical), so that the ISM band is a band which is moved by countries and is mainly opened to Industrial, scientific and Medical institutions.
It should be further noted that the Synchronization Signal Block (SSB) candidate includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
Fig. 2 is a flowchart of the snoop detection of S10 in fig. 1, please refer to fig. 2, optionally, the snoop detection method includes:
s101, a media access layer obtains monitoring parameters from a wireless resource control layer, wherein the monitoring parameters comprise a monitoring period, sensing signal duration, the number of sensing resource blocks and a busy state level value R;
s102, a media access layer informs a physical layer of carrying out interference energy level detection on a resource block;
s103, the physical layer carries out energy detection on each alternative synchronous information resource block, and calculates the energy level value L of each alternative synchronous information resource block x ；
S104, the physical layer converts the energy level value L x Reporting to the media access layer, the media access layer obtaining the energy level value L x The value range of (2) is used for marking busy and idle states of each alternative synchronous information resource block;
s105, when L is x >R, marking the alternative synchronous information resource block x as a busy state; when L is x And R is less than or equal to R, marking the alternative synchronization information resource block x as an idle state.
Specifically, the present application provides an optional implementation manner that, a base station performs monitoring detection, and first a media access layer obtains monitoring parameters from a radio resource control layer, where the monitoring parameters include a monitoring period T, a sensing signal duration T1, a sensing resource block number k, and a busy state level value R; after receiving the monitoring parameters, the media access layer informs a physical layer of carrying out interference energy level detection on resource blocks, k resource blocks form an alternative synchronous information resource block, namely k resource blocks are used as a detection unit, at the beginning of a monitoring period, the media access layer carries out receiving energy detection on each alternative synchronous information resource block, the duration of a sensing signal is t1, and the energy level value Lx of each alternative synchronous information resource block is obtained through calculation; the physical layer reports the energy level value Lx of each alternative synchronization information resource block to the media access layer, the media access layer obtains the value range of the energy level value Lx, compares the energy level value Lx of each alternative synchronization information resource block, and marks the busy and idle state of the alternative synchronization information resource blocks; if Lx > R, marking the alternative synchronous information resource block x as a busy state; if Lx < R, the alternative synchronization information resource block is marked as idle. By the arrangement, the base station can conveniently select a proper alternative synchronization information resource block to receive and send information, even if strong interference exists, the frequency domain and/or time domain positions of the main synchronization signal and the auxiliary synchronization signal can be rapidly and dynamically changed, and the communication function of the cell can still operate.
With respect to the interference energy level detection, an embodiment is provided in the present application, in the time period t1 of the sensing signal, the total received energy is 100mW, the receiving bandwidth is 10MHz, the signal energy density is calculated to be 10mW/MHz, and then the interference energy level is calculated by converting 10mW/MHz to dBm.
It should be noted that the sensing signal duration t1 is greater than or equal to 9 μ s, and if the sensing signal duration t1 is less than 9 μ s, the detection of the energy level value is affected. The value of the number k of the sensing resource blocks can be 3,6, 12, 20 and the like, and k can take different values according to different actual use conditions, which is not specifically limited in the application.
It should be further noted that, the LTE wireless access protocol system is divided into three layers: the first layer is a physical layer (PHY), the second layer is a medium access layer (MAC), a radio link control sublayer (RLC) and a packet data convergence protocol sublayer (PDCP), and the third layer is a radio resource control layer (RRC). The physical layer is the lowest layer of the wireless access system, and provides services to the upper layer by taking a transmission channel as an interface.
It can be understood that the unit of the frequency domain width monitored and detected by the base station is the frequency domain width of one candidate synchronization information resource block, and an embodiment provided by the present application is that the subcarrier width of one cell is 30KHz, and if one candidate synchronization information resource block includes 240 subcarriers, the frequency domain width of the candidate synchronization information resource block is 7.2MHz.
Fig. 3 is a detailed step flowchart of S30 in fig. 1, please refer to fig. 3, optionally, the base station selects one of the alternative synchronization information resource blocks according to the status flag, and sends the primary synchronization signal and the secondary synchronization signal, specifically:
s301, if the alternative synchronization information resource block currently used by the base station is in a free state, the current alternative synchronization information resource block is continuously used, and if the alternative synchronization information resource block currently used by the base station is in a busy state, other alternative synchronization information resource blocks are selected;
s302, after the alternative synchronous information resource block is selected, determining the content of each field in the main information block carried by the physical broadcast channel;
s303, the base station transmits the contents of the primary synchronization signal and the secondary synchronization signal by using the position of the alternative synchronization information resource block.
The method includes that a base station judges whether a currently used alternative synchronization information resource block is in a busy state or an idle state, if the currently used alternative synchronization information resource block is in the idle state, the currently used alternative synchronization information resource block is continuously used for transmitting and receiving information, and if the currently used alternative synchronization information resource block is in the busy state, other alternative synchronization information resource blocks are selected for transmitting and receiving information; after determining a new alternative synchronization information resource block, re-determining the content of each field in the master information block; and finally, transmitting the main synchronizing signal, the auxiliary synchronizing signal and the physical broadcast channel by using the position of the selected alternative synchronizing information resource block through a physical layer, wherein the time domain position is unchanged.
It should be noted that, the transmission of the candidate synchronization information resource blocks is performed with 20ms as the cycle, the first 5ms of each 20ms is called a half frame, and this half frame is used for transmitting the candidate synchronization information resource blocks, and the number of the candidate synchronization information resource blocks in this half frame is at least 4, so the transmission of the new candidate synchronization information resource block is preferably the next half frame in 20ms, and the candidate synchronization information resource blocks thus transmitted are all occupied changed interference-free resources.
It should be noted that, in each field that needs to be re-determined in the master information block, SSB-subarrieronoffset needs to be calculated according to the position of the new candidate synchronization information resource block, and the calculation methods of the remaining fields are consistent with those before the change.
Referring to fig. 3, optionally, if the alternative synchronization information resource block currently used by the base station is in a busy state, selecting another alternative synchronization information resource block specifically includes: sequencing the alternative synchronous information resource blocks from low to high according to the energy level value; selecting an alternative synchronization information resource block with the lowest energy level value; or, randomly selecting alternative synchronization information resource blocks. With this arrangement, the base station can select the candidate synchronization information resource block in the idle state to receive and transmit information.
The present application provides an optional implementation manner that, when the alternative synchronization information resource blocks currently used by the base station are in a busy state, the energy levels of the alternative synchronization information resource blocks that can be used by the base station are sorted from low to high, and the alternative synchronization information resource block with the lowest energy level value is selected for receiving and transmitting information.
Another optional implementation manner provided by the present application is that, the alternative synchronization information resource blocks currently used by the base station are in a busy state, the energy levels of the alternative synchronization information resource blocks that can be used by the base station are sorted from low to high, and the alternative synchronization information resource blocks in the idle state are randomly selected to perform information transceiving.
Fig. 4 is a schematic diagram of a system for avoiding cell synchronization interference, fig. 5 is a schematic diagram of an embodiment of a system for avoiding cell synchronization interference, fig. 6 is a schematic diagram of another embodiment of a system for avoiding cell synchronization interference, please refer to fig. 4, and based on the same inventive concept, the present application further provides a system 100 for avoiding cell synchronization interference, including: a determine conditions module 40, a listen detect module 50, and a change location module 60.
The determining condition module 40 is configured to detect whether the base station meets a trigger condition, where the trigger condition includes a first sub-trigger condition, a second sub-trigger condition, and a third sub-trigger condition; the first sub-trigger condition is: the base station carries out periodic monitoring; the second sub-trigger condition is: the base station receives that the uplink signal error rate of the user equipment is higher than a first threshold value; the third sub-trigger condition is: the base station receives an interference monitoring command; a monitoring detection module 50, configured to perform monitoring detection, perform energy detection on all alternative synchronization information resource blocks in an available frequency band of the base station, and perform status marking on the alternative synchronization information resource blocks; and a change position module 60, configured to select one of the candidate synchronization information resource blocks according to the status flag, and send the primary synchronization signal and the secondary synchronization signal.
Referring to fig. 5, an alternative embodiment of the present application is that the monitoring detection module 50 in the system 100 for avoiding cell synchronization interference includes: an acquisition parameter module 51, an interference energy level detection module 52 and a status flag module 53; an obtaining parameter module 51, configured to obtain monitoring parameters, where the monitoring parameters include a monitoring period, a sensing signal duration, a number of sensing resource blocks, and a busy state level value; an interference energy level detection module 52, configured to perform interference energy level detection on the resource blocks, perform received energy detection on each alternative synchronization information resource block, and calculate an energy level of each alternative synchronization information resource block; and a status marking module 53, configured to mark a busy-idle status for each candidate synchronization information resource block.
Referring to fig. 6, an alternative embodiment of the present application is a location change module 60 in a system 100 for avoiding cell synchronization interference, including: a position selecting module 61, a field information determining module 62 and an information sending module 63; a selection position module 61, configured to determine a busy-idle state of an alternative synchronization information resource block currently used by the base station, and select one of the alternative synchronization information resource blocks in an idle state; a field information determining module 62, configured to determine contents of each field in a master information block carried by a physical broadcast channel; and a sending information module 63, configured to send the contents of the primary synchronization signal and the secondary synchronization signal using the position of the selected candidate synchronization information resource block.
By the above embodiments, it can be seen that the method and system for avoiding cell synchronization interference provided by the present invention at least achieve the following beneficial effects:
the application provides a method and a system for avoiding cell synchronization interference, which comprises the following steps: when the base station meets the triggering condition, the base station monitors and detects the receiving energy level of the available frequency band;
when the base station carries out monitoring detection, energy detection is carried out on all alternative synchronous information resource blocks of an available frequency band, and state marking is carried out on the alternative synchronous information resource blocks; the base station selects one alternative synchronization information resource block for sending a main synchronization signal and an auxiliary synchronization signal according to the state mark; the trigger conditions comprise a first sub-trigger condition, a second sub-trigger condition and a third sub-trigger condition; the first sub-trigger condition is: the base station is in the stage of carrying out periodic monitoring; the second sub-trigger condition is: the base station receives that the uplink signal error rate of the user equipment is higher than a first threshold value; the third sub-trigger condition is: the base station receives an interference monitoring command; the base station meets the triggering condition, which specifically comprises the following steps: the base station at least meets one of the first sub-triggering condition, the second sub-triggering condition and the third sub-triggering condition. So set up, through monitoring and detecting the received energy level to available frequency channel, can the frequency domain and or the time domain position of dynamic change owner synchronizing signal and assistance synchronizing signal fast, even strong interference exists, the communication function of district still can operate.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (7)
1. A method for avoiding cell synchronization interference, comprising:
when a base station meets a trigger condition, the base station monitors and detects the receiving energy level of an available frequency band;
when the base station carries out the monitoring detection, carrying out energy detection on all alternative synchronous information resource blocks of the available frequency band, and carrying out state marking on the alternative synchronous information resource blocks;
the base station selects one of the alternative synchronization information resource blocks according to the state mark, and the alternative synchronization information resource block is used for sending a main synchronization signal and an auxiliary synchronization signal;
wherein the trigger condition comprises a first sub-trigger condition, a second sub-trigger condition and a third sub-trigger condition;
the first sub-trigger condition is as follows: the base station is in the stage of carrying out periodic monitoring;
the second sub-trigger condition is as follows: the base station receives that the uplink signal error rate of the user equipment is higher than a first threshold value;
the third sub-trigger condition is as follows: the base station receives an interference monitoring command;
the base station meets the triggering condition, which specifically comprises the following steps: the base station at least meets one of the first sub-trigger condition, the second sub-trigger condition and the third sub-trigger condition.
2. The method of claim 1, wherein the method for detecting interception comprises:
the media access layer obtains monitoring parameters from the wireless resource control layer, wherein the monitoring parameters comprise a monitoring period, sensing signal duration, sensing resource block number and a busy state level value R;
the media access layer informs a physical layer of carrying out interference energy level detection on the resource block;
the physical layer carries out energy detection on each alternative synchronous information resource block and calculates the energy water of each alternative synchronous information resource blockMean value L x ；
The physical layer combines the energy level value L x Reporting the energy level value to the media access layer, wherein the media access layer obtains the energy level value L according to the energy level value x The value range of (2) is used for marking busy and idle states for each alternative synchronization information resource block;
when L is x >R, marking the alternative synchronization information resource block x as a busy state; when L is x And marking the alternative synchronization information resource block x to be in an idle state when the number is less than or equal to R.
3. The method according to claim 1, wherein the base station selects one of the candidate synchronization information resource blocks according to the status flag, and sends a primary synchronization signal and a secondary synchronization signal, specifically:
if the alternative synchronization information resource block currently used by the base station is in a free state, the current alternative synchronization information resource block is continuously used, and if the alternative synchronization information resource block currently used by the base station is in a busy state, other alternative synchronization information resource blocks are selected;
after the alternative synchronous information resource block is selected, determining the content of each field in the main information block carried by the physical broadcast channel;
and the base station transmits the contents of the primary synchronization signal and the secondary synchronization signal by using the position of the alternative synchronization information resource block.
4. The method of claim 3, wherein if the candidate synchronization information resource block currently used by the base station is in a busy state, selecting another candidate synchronization information resource block specifically comprises:
sequencing the alternative synchronous information resource blocks from low to high according to the energy level value;
selecting the alternative synchronization information resource block with the lowest energy level; or the like, or, alternatively,
and randomly selecting the alternative synchronization information resource block.
5. A system for avoiding cell-synchronized interference, comprising: the system comprises a condition determining module, a monitoring and detecting module and a position changing module;
the determining condition module is configured to detect whether the base station meets a trigger condition, where the trigger condition includes a first sub-trigger condition, a second sub-trigger condition, and a third sub-trigger condition; the first sub-trigger condition is as follows: the base station carries out periodic monitoring; the second sub-trigger condition is as follows: the base station receives that the uplink signal error rate of the user equipment is higher than a first threshold value; the third sub-trigger condition is as follows: the base station receives an interference monitoring command;
the monitoring detection module is used for monitoring detection, performing energy detection on all alternative synchronous information resource blocks of the available frequency band of the base station, and performing state marking on the alternative synchronous information resource blocks;
and the position changing module is used for selecting one of the alternative synchronization information resource blocks according to the state mark and sending a main synchronization signal and an auxiliary synchronization signal.
6. The system for avoiding cell synchronization interference according to claim 5, wherein the listening detection module comprises: the device comprises an acquisition parameter module, an interference energy level detection module and a state marking module;
the parameter acquisition module is used for acquiring monitoring parameters, wherein the monitoring parameters comprise a monitoring period, sensing signal duration, sensing resource block number and busy state level value;
the interference energy level detection module is used for detecting the interference energy level of the resource block, detecting the receiving energy of each alternative synchronization information resource block, and calculating the energy level of each alternative synchronization information resource block;
and the state marking module is used for marking the busy and idle states of each alternative synchronous information resource block.
7. The system for avoiding cell-synchronized interference according to claim 5, wherein said relocation module comprises: the system comprises a position selecting module, a field information determining module and an information sending module;
the selection position module is configured to determine a busy-idle state of the candidate synchronization information resource block currently used by the base station, and select one of the candidate synchronization information resource blocks in an idle state;
the field information determining module is used for determining the content of each field in the main information block carried by the physical broadcast channel;
and the information sending module is used for sending the contents of the main synchronizing signal and the auxiliary synchronizing signal by using the position of the alternative synchronizing information resource block.
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| CN202211393717.8A CN115802474A (en) | 2022-11-08 | 2022-11-08 | Method and system for avoiding cell synchronous interference |
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| CN202211393717.8A CN115802474A (en) | 2022-11-08 | 2022-11-08 | Method and system for avoiding cell synchronous interference |
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