CN111132252B - Low-delay base station switching method and system - Google Patents
Low-delay base station switching method and system Download PDFInfo
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- CN111132252B CN111132252B CN201911413176.9A CN201911413176A CN111132252B CN 111132252 B CN111132252 B CN 111132252B CN 201911413176 A CN201911413176 A CN 201911413176A CN 111132252 B CN111132252 B CN 111132252B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a low-delay base station switching method and a system, which comprises the following steps: the terminal polls and traverses all the guide broadcast frequency points and the spread spectrum factor parameters to perform guide broadcast in the search range; judging whether the searched communication quality of the guide broadcast meets the communication condition, if so, trying to establish communication connection with the guide broadcast; if not, continuing searching for the guide broadcast; if the terminal receives the agreement response, the terminal periodically reports self state information and position information and adjusts the interval time of searching guide broadcast according to the moving speed of the terminal; if a disagreeable response is received, the attempt to connect is continued. The invention avoids the frequent switching of the base station and the overlarge power consumption of the terminal, and prolongs the standby time of the terminal; the terminal can prejudge the communication quality, and the base station with better communication quality is switched in advance, so that the interruption of positioning data can not occur, and further the 'jump point' generated by the positioning result can not be caused, and the stability of the system can be better ensured.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a low latency base station handover method and system.
Background
In a wireless communication network of a conventional internet of things, such as a low power consumption long distance wireless communication network (LPWAN), a terminal periodically reports data to a base station associated with the terminal, and the base station receives the reported data and replies a response. Due to the possibility of movement of the terminal or due to changes in the radio channel caused by other reasons, the connection between the terminal and the base station is interrupted, which requires the terminal to have a base station handover function. The base station handover algorithm in the traditional wireless internet of things generally adopts a hard handover mode, namely, after the communication between a terminal and a current communication base station fails, the terminal starts to try to search other surrounding base stations.
For example, in a LoRa-based low-power-consumption long-distance wireless local area network LoRaWAN, a plurality of channels exist between a terminal and a base station, communication parameters of each channel are different, and when the terminal wants to establish a communication connection with a surrounding base station, all possible channel parameters must be tried in sequence until the communication with the base station is successful. In the application scenario that the terminal is frequently switched and the requirement on the real-time performance of communication is high, frequent communication interruption is generated due to the switching of the base station, and in addition, the power consumption of the terminal is high due to the fact that all channel parameters are polled at one time, so that the standby time of the terminal is greatly shortened for the terminal which is usually powered by a battery.
In an internet of things network for positioning personnel and articles with high requirements on communication real-time performance, the requirements on the communication real-time performance are high, namely the periodic reporting frequency of a terminal reaches the second level. However, the terminal is usually in a state of continuously moving, the location is continuously changed, and the channel state is changed dramatically, so that the base station is frequently switched, and if the traditional "hard handover" method is adopted, the following problems exist:
1) only after communication fails, other base stations are searched, so that the base station switching time is long, positioning data interruption can occur, and a positioning result generates 'jumping points';
2) when the terminal is located at the junction of the signal coverage areas of the two base stations, the phenomenon of frequently switching the base stations occurs, so that communication is unstable, and the standby time of the terminal is shortened due to overhigh power consumption of frequent base station switching.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a low-latency base station handover method and system. In the system and the method,
in order to achieve the purpose, the technical scheme of the invention is as follows:
a low-delay base station switching method is used for a terminal, and comprises the following steps:
the terminal polls and traverses all the guide broadcast frequency points and the spread spectrum factor parameters to perform guide broadcast in the search range;
judging whether the searched communication quality of the guide broadcast meets the communication condition, if so, trying to establish communication connection with the guide broadcast; if not, continuing searching for the guide broadcast;
if the terminal receives the agreement response, the terminal reports the self state information and the position information periodically and adjusts the interval time of searching the guide broadcast according to the moving speed of the terminal; if a disagreeable response is received, the attempt to connect is continued.
Preferably, the interval time of the search directed broadcast is inversely proportional to the moving speed of the terminal.
Preferably, the low-delay base station switching method further includes the steps of:
the terminal periodically judges whether the communication quality of the current communication connection is lower than a preset communication quality threshold value, if so, other guide broadcasts are searched until a new guide broadcast meeting the requirement is searched;
judging whether the communication quality of the new guide broadcast is better than that of the current communication connection, if so, switching to a base station corresponding to the new guide broadcast for communication connection; if not, other guided broadcasts are continuously searched.
Preferably, the communication quality is determined by signal strength, signal-to-noise ratio and base station busy level in the pilot broadcast.
Preferably, the communication quality Q is calculated by the formula:
q ═ a × RSSI + b × SNR + c × BusyLevel (formula 1)
RSSI, SNR and BusyLevel are respectively the signal strength, signal-to-noise ratio and base station busy degree of the pilot broadcast;
a. b and c are weight coefficients of three parameters respectively, wherein the calculation formula of the busy degree BusyLevel of the base station is as follows:
BusyLevel＝10lg(C1s/Cmax) (formula 2)
C1SFor the actual traffic of the base station in 1s, CmaxThe maximum amount of traffic that the base station can theoretically support.
A low-delay base station switching method is used for a base station, the base station transmits a guide broadcast outwards, the guide broadcast comprises communication parameters including cell numbers, base station numbers, communication frequency points, a modulation mode and transmission power, and the low-delay base station switching method comprises the following steps:
the base station is initialized to be in a receiving mode and waits for the arrival of a guide broadcast time point;
when the pilot broadcasting time point arrives, the base station detects whether a pilot broadcasting channel is idle, if so, the base station broadcasts the pilot broadcasting outwards by superposing a random offset T2 at a fixed interval T1, and the range of the random offset T2 is a random quantity between-100 ms and 100 ms; and if the mobile terminal is not idle, performing channel detection again after a time period of random backoff T3, wherein T3 is a random quantity within 5-20 ms, the base station calculates the sending time point of the next pilot broadcast every time the base station sends the pilot broadcast, and the latest random number T2 is generated in each calculation.
Preferably, the base station detects whether the pilot broadcast channel is idle by using carrier sense.
Preferably, the base station adopts a plurality of modulation modes to realize the selection of different signal coverage directions.
A computer readable storage medium storing one or more programs which, when executed by a server comprising a plurality of application programs, cause the server to perform the steps of the low latency base station handover method of any of claims 1 to 5 or the steps of the low latency base station handover method of any of claims 6 to 8.
A low-delay base station switching system comprising terminals and at least two base stations that broadcast a pilot broadcast to each terminal and perform wireless communication with the terminals, wherein:
the base station includes:
the sending module is used for periodically broadcasting the guide broadcast;
the receiving module is used for receiving the periodic reported data of the terminal and giving a response; and
the terminal includes:
the searching module is used for searching the guide broadcast broadcasted by the surrounding base stations;
the storage module is used for storing a preset communication quality threshold value;
a communication quality obtaining module for obtaining the communication quality of the guide broadcast of the base station according to the response information;
the judging module is used for judging whether the searched communication quality of the guide broadcast meets the requirement; the device is used for judging whether the communication quality exceeds a preset communication quality threshold value or not according to the communication quality obtained by the communication quality obtaining device; judging whether the communication quality of the new guide broadcast is better than that of the current communication connection;
the motion state acquisition module is used for acquiring the moving speed of the terminal and sending the moving speed of the terminal to the control module;
the control module is used for controlling the trigger searching device according to the judgment result of the judgment module; the base station is used for controlling to establish connection with a base station of the guided broadcast meeting the requirement according to the judgment result of the judgment module and periodically reporting data; the base station is used for controlling the connection establishment with the base station of the new guide broadcast according to the judgment result of the judgment module, and is also used for adjusting the interval time of the search module for searching the guide broadcast according to the moving speed of the terminal.
Based on the technical scheme, the invention has the beneficial effects that:
1) in the invention, all base stations periodically broadcast the guide broadcast, and the terminal actively searches the guide broadcast signals which meet the requirements around, thereby avoiding frequent switching of the base stations, namely avoiding overlarge power consumption of the terminal and prolonging the standby time of the terminal;
2) the terminal can prejudge the communication quality, and switch the base station with better communication quality in advance, so that the interruption of positioning data can not occur, and further the 'jump point' generated by the positioning result can not be caused, and the stability of the system can be better ensured;
3) the invention gives consideration to the switching speed and the switching power consumption of the terminal base station, can greatly shorten the switching time of the terminal base station, reduces the extra power consumption caused by the switching of the base station, has strong anti-interference performance of the system and ensures that the system can stably run under the condition of interference.
Drawings
FIG. 1: the invention relates to a flow diagram of a terminal in a low-delay base station switching method;
FIG. 2: the invention relates to a circuit architecture diagram of a terminal in a low-delay base station switching method;
FIG. 3: the invention relates to a flow diagram of a base station in a low-delay base station switching method;
FIG. 4: the invention relates to a circuit architecture diagram of a base station in a low-delay base station switching method;
FIG. 5: the invention discloses a network architecture diagram of a low-delay base station switching method.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example one
As shown in fig. 1 and 2, a low-latency base station handover method is used for a terminal, and the low-latency base station handover method includes the following steps:
the terminal polls and traverses all the guide broadcast frequency points and the spread spectrum factor parameters to perform guide broadcast in the search range;
judging whether the searched communication quality of the guide broadcast meets the communication condition, if so, trying to establish communication connection with the guide broadcast; if not, continuing searching for the guide broadcast;
if the terminal receives the agreement response, the terminal reports the self state information and the position information periodically and adjusts the interval time of searching the guide broadcast according to the moving speed of the terminal; if a disagreeable response is received, the attempt to connect is continued.
The terminal periodically judges whether the communication quality of the current communication connection is lower than a preset communication quality threshold value, if so, other guide broadcasts are searched until a new guide broadcast meeting the requirement is searched;
judging whether the communication quality of the new guide broadcast is better than that of the current communication connection, if so, switching to a base station corresponding to the new guide broadcast for communication connection; if not, other guided broadcasts are continuously searched.
Further, the communication quality is determined by the signal strength, signal-to-noise ratio, and base station busy level in the pilot broadcast. The communication quality Q is calculated by the formula:
q ═ a × RSSI + b × SNR + c × BusyLevel (formula 1)
RSSI, SNR and BusyLevel are respectively the signal strength, signal-to-noise ratio and base station busy degree of the pilot broadcast; a. b and c are weight coefficients of three parameters respectively, wherein the calculation formula of the busy degree BusyLevel of the base station is as follows:
BusyLevel＝10lg(C1s/Cmax) (formula 2)
C1SFor the actual traffic of the base station in 1s, CmaxThe maximum amount of traffic that the base station can theoretically support.
Further, the specific implementation scheme for adjusting the interval time of the search-oriented broadcast according to the moving speed of the terminal is as follows: the terminal obtains the self motion state, namely motion or static, through the motion sensor, when the equipment moves, the position change is often faster, so that the equipment can more easily enter the signal coverage range of the base station, and the guide broadcast is required to be quickly searched; when the device is static, the position of the device is not changed, and excessive searching base station oriented broadcasting is not effective, so that power consumption is wasted. Therefore, when the terminal cannot search for the pilot broadcast, the pilot broadcast search interval can be enlarged in a stepwise increasing manner. Assume a guided broadcast search interval of Tsrch_intAnd when the search interval is calculated after the search is finished each time, if the terminal is in a motion state, the following steps are carried out:
if the terminal is in a static state, the following steps are carried out:
wherein, Tmax moveFor maximum guided broadcast search interval for terminal in motion, T for balancing search speed and power consumptionmax moveTypically set to 3 times the motion reporting interval. For example, if the periodic reporting interval of the terminal motion state is 5 seconds, T ismax move15 seconds.
In addition, when the terminal is in a static state, and T issrch_intHaving reached a large value, if the terminal changes from a stationary state to a moving state, e.g., suddenly moves, a pilot broadcast search should be immediately turned on while the pilot broadcast search interval T is setsrch_intAnd returns to the initial value, which can speed up the speed of the terminal for resuming communication.
As shown in fig. 3 and 4, a low-delay base station switching method is used for a base station, where the base station transmits a pilot broadcast to the outside, where the pilot broadcast includes communication parameters such as a cell number, a base station number, a communication frequency point, a modulation mode, and a transmission power, and the low-delay base station switching method includes the following steps:
the base station is initialized to be in a receiving mode and waits for the arrival of a guide broadcast time point;
when the pilot broadcast time point arrives, the base station detects whether a pilot broadcast channel is idle by adopting carrier sense, if the pilot broadcast channel is idle, the base station superposes a random offset T2 at a fixed interval T1 to broadcast the pilot broadcast outwards, and the range of the random offset T2 is a random quantity between-100 ms and 100 ms; and if the mobile terminal is not idle, performing channel detection again after a time period of random backoff T3, wherein T3 is a random quantity within 5-20 ms, the base station calculates the sending time point of the next pilot broadcast every time the base station sends the pilot broadcast, and the latest random number T2 is generated in each calculation.
For a low-power-consumption long-distance high-concurrency personnel and article positioning network based on a positioning beacon and a wireless communication technology, a base station can adopt different modulation modes to realize selection of different signal coverage ranges. Since the pilot broadcast is a signal for guiding the terminal to communicate with the base station, it is necessary to ensure that the coverage of the pilot broadcast signal is equal to or slightly less than that of the communication signal, otherwise, the terminal may search for the pilot broadcast signal of the base station but cannot establish a communication connection with the base station. The base station can determine the modulation mode for sending the pilot broadcast according to the modulation mode of the communication of the base station, and the terminal does not know which modulation mode is adopted by the base station before communicating with the base station, so that the terminal needs to poll a plurality of modulation modes when searching the pilot broadcast.
A computer-readable storage medium storing one or more programs which, when executed by a server including a plurality of application programs, cause the server to perform the steps of a low-latency base station handover method as described on a terminal side or the steps of a low-latency base station handover method as described on a base station side.
As shown in fig. 5, a low-delay base station switching system includes terminals and at least two base stations that broadcast a pilot broadcast to each terminal and perform wireless communication with the terminals, wherein:
the base station includes:
the sending module is used for periodically broadcasting the guide broadcast;
the receiving module is used for receiving the periodic reported data of the terminal and giving a response; and
the terminal includes:
the searching module is used for searching the guide broadcast broadcasted by the surrounding base stations;
the storage module is used for storing a preset communication quality threshold value;
a communication quality obtaining module for obtaining the communication quality of the guide broadcast of the base station according to the response information;
the judging module is used for judging whether the searched communication quality of the guide broadcast meets the requirement; the device is used for judging whether the communication quality exceeds a preset communication quality threshold value or not according to the communication quality obtained by the communication quality obtaining device; judging whether the communication quality of the new guide broadcast is better than that of the current communication connection;
the motion state acquisition module is used for acquiring the moving speed of the terminal and sending the moving speed of the terminal to the control module;
the control module is used for controlling the trigger searching device according to the judgment result of the judgment module; the base station is used for controlling to establish connection with a base station of the guided broadcast meeting the requirement according to the judgment result of the judgment module and periodically reporting data; the base station is used for controlling the connection establishment with the base station of the new guide broadcast according to the judgment result of the judgment module, and is also used for adjusting the interval time of the search module for searching the guide broadcast according to the moving speed of the terminal.
The above description is only a preferred embodiment of the low-latency base station handover method and system disclosed in the present invention, and is not intended to limit the scope of the embodiments of the present disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present disclosure should be included in the protection scope of the embodiments of the present disclosure.
The systems and modules illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include transitory computer readable media (transmyedia) such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Claims (9)
1. A low-delay base station switching method is characterized in that the method is used for a terminal and comprises the following steps:
the terminal polls and traverses all the guide broadcast frequency points and the spread spectrum factor parameters to perform guide broadcast in a search range;
judging whether the searched communication quality of the guide broadcast meets the communication condition, if so, trying to establish communication connection with the guide broadcast; if not, continuing searching for the guide broadcast;
if the terminal receives the agreement response, the terminal reports the self state information and the position information periodically and adjusts the interval time of searching the guide broadcast according to the moving speed of the terminal; if the non-agreement response is received, continuing to attempt connection,
the method is used for a base station, wherein the base station transmits a guide broadcast outwards, the guide broadcast comprises communication parameters including cell numbers, base station numbers, communication frequency points, modulation modes and sending power, and the method comprises the following steps:
the base station is initialized to be in a receiving mode and waits for the arrival of a guide broadcast time point;
when the pilot broadcasting time point arrives, the base station detects whether a pilot broadcasting channel is idle, if so, the base station broadcasts the pilot broadcasting outwards by superposing a random offset T2 at a fixed interval T1, and the range of the random offset T2 is a random quantity between-100 ms and 100 ms; and if the mobile terminal is not idle, performing channel detection again after a time period of random backoff T3, wherein T3 is a random quantity within 5-20 ms, the base station calculates the sending time point of the next pilot broadcast every time the base station sends the pilot broadcast, and the latest random number T2 is generated in each calculation.
2. A method as claimed in claim 1, wherein the time interval of the search-oriented broadcast is inversely proportional to the moving speed of the terminal.
3. A method as claimed in claim 1, wherein the method further comprises the following steps:
the terminal periodically judges whether the communication quality of the current communication connection is lower than a preset communication quality threshold value, if so, other guide broadcasts are searched until a new guide broadcast meeting the requirement is searched;
judging whether the communication quality of the new guide broadcast is better than that of the current communication connection, if so, switching to a base station corresponding to the new guide broadcast for communication connection; if not, other guided broadcasts are continuously searched.
4. A method as claimed in claim 1, wherein the communication quality is determined by the signal strength, signal-to-noise ratio and base station busy level of the pilot broadcast.
5. A method as claimed in claim 3, wherein the communication quality Q is calculated by the following formula:
q ═ a × RSSI + b × SNR + c × BusyLevel (formula 1)
RSSI, SNR and BusyLevel are respectively the signal strength, signal-to-noise ratio and base station busy degree of the pilot broadcast; a. b and c are weight coefficients of three parameters respectively, wherein the calculation formula of the busy degree BusyLevel of the base station is as follows:
BusyLevel＝10lg(C1s/Cmax) (formula 2)
C1SFor the actual traffic of the base station in 1s, CmaxThe maximum amount of traffic that the base station can theoretically support.
6. A method as claimed in claim 1, wherein the base station detects whether the pilot broadcast channel is idle by using carrier sense.
7. A method as claimed in claim 1, wherein the base station uses multiple modulation schemes to select different signal coverage directions.
8. A computer readable storage medium, characterized in that the computer readable storage medium stores one or more programs which, when executed by a server comprising a plurality of application programs, cause the server to carry out the steps of the low latency base station handover method according to any one of claims 1 to 7.
9. A low-delay base station switching system comprising terminals and at least two base stations which broadcast a pilot broadcast to each terminal and perform wireless communication with the terminals, wherein:
the base station includes:
the sending module is used for periodically broadcasting the guide broadcast;
the receiving module is used for receiving the periodic reported data of the terminal and giving a response; and
the terminal includes:
the searching module is used for searching the guide broadcast broadcasted by the surrounding base stations;
the storage module is used for storing a preset communication quality threshold value;
a communication quality obtaining module for obtaining the communication quality of the guide broadcast of the base station according to the response information;
the judging module is used for judging whether the searched communication quality of the guide broadcast meets the requirement; the device is used for judging whether the communication quality exceeds a preset communication quality threshold value or not according to the communication quality obtained by the communication quality obtaining device; judging whether the communication quality of the new guide broadcast is better than that of the current communication connection;
the motion state acquisition module is used for acquiring the moving speed of the terminal and sending the moving speed of the terminal to the control module;
the control module is used for controlling the trigger searching device according to the judgment result of the judgment module; the base station is used for controlling to establish connection with a base station of the guided broadcast meeting the requirement according to the judgment result of the judgment module and periodically reporting data; the base station is used for controlling the connection establishment with the base station of the new guide broadcast according to the judgment result of the judgment module, and is also used for adjusting the interval time of the search module for searching the guide broadcast according to the moving speed of the terminal.
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