CN114222239B - RSRP hysteresis margin dynamic optimization method for communication link switching judgment - Google Patents
RSRP hysteresis margin dynamic optimization method for communication link switching judgment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
- H04W4/027—Services making use of location information using location based information parameters using movement velocity, acceleration information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
Abstract
The invention discloses a dynamic optimization method of RSRP hysteresis margin for communication link switching judgment, which comprises the following steps: detecting weather conditions in real time, and acquiring corresponding weather influence factors according to the weather conditions，The method comprises the steps of carrying out a first treatment on the surface of the Real-time detection of terminal speedThe method comprises the steps of carrying out a first treatment on the surface of the According to weather-influencing factorsAnd terminal speedCalculating dynamic RSRP hysteresis marginThe method comprises the steps of carrying out a first treatment on the surface of the Adjusting RSRP hysteresis margin to. According to the invention, different weather conditions and corresponding weather influence factors are measured through the train-ground communication test in advance to form a table function, the weather influence factors can be quickly matched according to the weather conditions in the subsequent dynamic adjustment process, and then the RSRP hysteresis tolerance is dynamically adjusted in real time according to the weather influence factors and the terminal speed, so that the terminal can reliably switch communication links under different weather conditions and different speeds.
Description
Technical Field
The invention relates to the field of communication switching, in particular to an RSRP hysteresis margin dynamic optimization method for communication link switching judgment.
Background
With the development of high-speed intelligent railways, the vehicle-ground communication service requirements are continuously expanded, and the data volume and real-time requirements of vehicle-ground communication on transmission are continuously improved. Because of limited antenna coverage, a plurality of base stations are usually distributed along a track in the prior art, and communication links are switched between the base stations in the running process of the vehicle-mounted terminal so as to realize uninterrupted data transmission. And a signal overlapping area is arranged between the adjacent base stations, and the vehicle-mounted terminal switches communication links after driving to the signal overlapping area. When the link is switched, the current common decision algorithm generally sets a corresponding hysteresis tolerance based on Reference Signal Received Power (RSRP), and when the difference between the RSRP of the target base station and the RSRP of the current base station is higher than the hysteresis tolerance, the switch is triggered.
However, in the existing link switching decision algorithm, the RSRP hysteresis margin is usually set to a fixed value, but in the actual outdoor communication process, the communication quality is obviously affected by weather conditions, in severe weather conditions, the RSRP received by the foreseeable base station is obviously reduced, the RSRP difference between the target base station and the current base station in the link switching process can be obviously different from that in normal weather conditions, and in different weather conditions, it is unreasonable to use a uniform fixed RSRP hysteresis margin. In addition, the faster the train speed, the shorter the time of the train passing through the signal overlapping area, and for the condition of high-speed running of the train, the hysteresis margin which is possibly fixedly arranged is too high, so that the train still does not trigger switching after passing through the signal overlapping area, and the signal disconnection condition occurs.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a dynamic optimization method for RSRP hysteresis tolerance for judging communication link switching.
The aim of the invention is mainly realized by the following technical scheme:
a method for dynamic optimization of RSRP hysteresis margin for communication link handoff decisions, the method comprising the steps of:
detecting weather conditions in real time, and acquiring corresponding weather influence factors kappa according to the weather conditions, wherein kappa is more than or equal to 1;
detecting the terminal speed v in real time;
calculating a dynamic RSRP hysteresis margin delta P' according to the weather influence factor kappa and the terminal speed v;
the RSRP hysteresis margin is adjusted to Δp'.
Preferably, the calculation formula of the dynamic RSRP hysteresis margin Δp' is:
ΔP′＝κ[ΔP-(α+β)(n-1)τν]；
Δp is an RSRP hysteresis margin set corresponding to a normal weather condition, α is a rate of attenuation of the transmission power of the terminal signal with the change of the distance when the terminal signal is transmitted to the current base station in the normal weather condition, β is a rate of attenuation of the transmission power of the terminal signal with the change of the distance when the terminal signal is transmitted to the target base station in the normal weather condition, n is a redundant switching number set for ensuring that the terminal reliably performs communication link switching in a signal overlapping region, and τ is a time required for performing each communication link switching.
Preferably, the method for acquiring the weather effect factor kappa comprises the following steps:
the method comprises the steps of measuring the path loss PL of the transmitting power when a terminal signal is transmitted to a base station under normal weather conditions and the path loss PL' of the transmitting power when the terminal signal is transmitted to the base station under different severe weather conditions in advance;
obtaining weather influence factors kappa corresponding to different weather conditions according to PL' and PL comparison analysis, and forming a table function corresponding to the weather conditions and the weather influence factors kappa;
and searching and matching the corresponding weather influence factor kappa in the table function according to the weather conditions monitored in real time.
Preferably, the weather influencing factors kappa and PL', PL are related as follows
Preferably, the calculated dynamic RSRP hysteresis margin Δp' is compared with a preset RSRP hysteresis margin minimum Δp before adjusting the RSRP hysteresis margin to Δp min Comparing;
when DeltaP'. Gtoreq.DeltaP min When the RSRP hysteresis margin is adjusted to delta P'; when (when)When the RSRP hysteresis margin is adjusted to delta P min 。
In summary, the invention has the following beneficial effects: different weather conditions and corresponding weather influence factors are measured through a train-ground communication test in advance to form a table function, the weather influence factors can be quickly matched according to the weather conditions in the subsequent dynamic adjustment process, and then the RSRP hysteresis tolerance is dynamically adjusted in real time according to the weather influence factors and the terminal speed, so that the terminal can reliably switch communication links under different weather conditions and different speeds.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions and advantages of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method according to an embodiment of the present invention.
FIG. 2 is a graph of a table function corresponding to weather conditions and weather influencing factors in accordance with one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the detailed description and specific examples, while indicating the embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein. Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality.
It should be noted that the terms "comprises" and "comprising," along with any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, the present invention provides an RSRP hysteresis margin dynamic optimization method for communication link switching determination, which comprises the following steps:
step 1, detecting weather conditions in real time, and acquiring corresponding weather influence factors kappa which are more than or equal to 1 according to the weather conditions.
In some embodiments of the present invention, the method for obtaining the weather effect factor κ is:
step 11, the path loss PL of the transmitting power when the terminal signal is transmitted to the base station in normal weather and the path loss PL' of the transmitting power when the terminal signal is transmitted to the base station in different bad weather are measured in advance, and the path loss can be obtained by subtracting the power of the signal received by the base station from the transmitting power of the terminal signal.
It should be noted that, when path loss is measured in normal weather conditions and different severe weather conditions, only the weather condition variable should be ensured as much as possible, that is, in the above different path loss measurements, it should be ensured that factors that may affect path loss, such as a terminal position, a base station position, a terminal signal transmission power, etc., are consistent.
In some embodiments of the present invention, the weather condition level may be judged by various weather factors such as rain, snow, haze, sand, etc., each weather may be classified into a plurality of levels such as normal weather, low bad weather, medium bad weather, high bad weather, extreme bad weather, etc., the weather condition determination may be performed by using a weather early warning level determination method, and the weather conditions of blue, yellow, orange, red weather early warning levels correspond to low bad, medium bad, high bad, extreme bad, respectively, and the remaining weather conditions without early warning levels are normal weather.
Specifically, when a certain weather factor monitoring index is at a high/ultra-high value, for example, when there is a rainfall of 50/100 mm, the weather is determined as high severe weather/extremely severe weather. When the monitoring index of a certain weather factor is at a medium-high value, for example, the visibility of sand and dust is less than 1000 meters, the weather is judged as moderate and bad weather. Similarly, when the weather factor monitoring index is at a low-medium value, the weather is determined to be low bad weather.
And step 12, obtaining weather influence factors kappa corresponding to different weather conditions according to the PL' and PL comparison analysis, and forming a table function corresponding to the weather conditions and the weather influence factors kappa.
Path loss is a loss introduced between a transmitter and a receiver due to propagation space and can be considered to be mainly affected by propagation distance and propagation environment. Since the propagation distance and propagation environment other than weather conditions are consistent in step 11, it can be considered that the change in path loss for different severe weather conditions compared to normal weather conditions has a positive correlation with the severity level of the weather conditions, and thus, in some embodiments of the present invention, the weather effect factors k and PL', PL are correlated asIn some embodiments of the invention, the table functions corresponding to weather condition levels and weather influencing factors k in rainy and snowy weather are shown in fig. 2.
Preferably, when a plurality of weather factor monitoring indexes are all in medium and low weather conditions, the weather influence factors corresponding to the weather influence factors can be added to obtain a final weather influence factor kappa.
And step 13, searching and matching the corresponding weather influence factor kappa in the table function according to the weather conditions monitored in real time. The method for determining the monitored weather condition may refer to step 11, which will not be described herein.
As shown in fig. 1, the method of the present invention further includes step 2, detecting the terminal speed v in real time; and 3, calculating a dynamic RSRP hysteresis margin delta P' according to the weather influencing factor kappa and the terminal speed v.
Specifically, the calculation formula of the dynamic RSRP hysteresis margin Δp' is:
ΔP′＝κ[ΔP-(α+β)(n-1)τν]。
wherein, delta P is the RSRP hysteresis margin set under the condition of corresponding normal weather; alpha is the attenuation rate of the transmitting power of the terminal signal along with the change of the distance when the terminal signal is transmitted to the current base station under the normal weather condition, and the attenuation rate can be obtained by testing; beta is the attenuation rate of the transmitting power of the terminal signal along with the change of the distance when the terminal signal is transmitted to the target base station under the normal weather condition, and the attenuation rate can be obtained by testing; n is the number of redundant switching times set for ensuring the terminal to reliably switch the communication links in the signal overlapping area, and tau is the time required for switching the communication links each time, and can be obtained through testing.
The principle of calculation of Δp' is described below in terms of both weather conditions and terminal speed. Firstly, considering the influence of weather conditions, under normal weather conditions, a judging formula for carrying out communication link switching after a terminal enters a signal overlapping area is RSRP (x, j) -RSRP (x, i) > delta P, x represents the terminal, j represents a target base station, i represents a current base station, RSRP (x, j) represents the receiving power of the target base station when j receives a terminal x signal at a certain position, and RSRP (x, i) represents the receiving power of the current base station when i receives the terminal x signal at the same position.
The RSRP of a base station can be expressed as the terminal signal transmit power minus the terminal to base station path loss minus the shadowing at the base station, so the decision formula can be transformed into Pt (x) -RL (x, j) -S (x, j, σ) - [ Pt (x) -RL (x, i) -S (x, i, σ ') ] Δp, i.e., RL (x, i) -RL (x, j) +s (x, i, σ') -S (x, j, σ) > Δp. The difference of the geographic positions of two adjacent base stations is not large, the difference of the conditions of blocking signals by the barriers is also not large, and shadow fading can be considered to be equal, so that the formula can be further converted into RL (x, i) -RL (x, j) not less than deltaP.
Since the path loss and weather conditions can be considered to be in a positive correlation linear relationship, and shadow fading is mainly influenced by the condition that the terminal blocks signals to the base station, and is little influenced by weather, the difference in RSRP between the target base station and the current base station can be expressed as RSRP ' (x, j) -RSRP ' (x, i) =pt (x) - κrl (x, j) -S (x, j, σ) - [ Pt (x) - κrl (x, i) -S (x, i, σ ') ], i.e., RSRP ' (x, j) -RSRP ' (x, i) =κrl (x, i) - κrl (x, j), in severe weather conditions. The difference value formula RSRP '(x, j) -RSRP' (x, i) =kappa RL (x, i) -kappa RL (x, j) of two base stations is combined with the normal weather judgment formula RL (x, i) -RL (x, j) not less than delta P in severe weather, and the terminal communication link switching judgment condition in severe weather can be expressed as RSRP '(x, j) -RSRP' (x, i) not less than kappa delta P.
Secondly, considering the influence of the terminal speed, because the communication link switching needs a certain time and the number of redundant switching times is set in the existing train-ground communication to ensure reliable switching in the signal overlapping area, the RSRP hysteresis margin set during low-speed running can be too high for a train running at a high speed, so that the terminal running at the high speed still does not finish the communication link switching after the terminal running at the high speed leaves the signal overlapping area. Therefore, in the case of high-speed operation of the terminal, the RSRP hysteresis margin should be appropriately reduced so that the terminal can perform the communication link switching in advance, and ensure that the terminal can complete the communication link switching when the signal overlapping region is driven out.
Assuming that, under the condition of the terminal speed v, the number of redundant switching times is set to n in order to ensure that the terminal reliably completes the communication link switching, the length of the area meeting the redundant switching condition in the signal overlapping area can be expressed as l= (n-1) τν. In certain weather conditions, the terminal from entering the area to exiting, and the difference between the RSRP when exiting the area and entering the area for the current base station can be expressed as RSRP' 2 (x,i)-RSRP′ 1 (x, i) = - κα (n-1) τν, the difference between the above RSRP for the target base station can be expressed as RSRP' 2 (x,j)-RSRP′ 1 (x, j) =κβ (n-1) τν, and combining the two formulas gives RSRP' 2 (x,j)-RSRP′ 1 (x,j)-[RSRP′ 2 (x,i)-RSRP′ 1 (x,i)]=κ (α+β) (n-1) τν, further transformed into RSRP' 2 (x,j)-RSRP′ 2 (x,i)＝RSRP′ 1 (x,j)-RSRP′ 1 (x,i)+κ(α+β)(n-1)τν。
Since the region is defined as the region in the signal overlapping region satisfying the redundant switching condition, it can be considered that the terminal communication link switching condition is just satisfied when entering the region, that is, the difference between the two base stations RSRP when entering the region should satisfy RSRP' 1 (x,j)-RSRP′ 1 (x, i) is not less than κΔP, and when the area is correspondingly obtained, the difference formula of the RSRP of the two base stations meets the RSRP' 2 (x,j)-RSRP′ 2 (x, i) is equal to or greater than kΔP+κ (α+β) (n-1) τν. In order to ensure that the terminal can reliably perform communication link switching under the condition of high-speed movement, the invention reduces the meeting condition of the difference between the RSRP entering the area to RSRP' 1 (x,j)-RSRP′ 1 (x, i) is equal to or greater than κΔp- κ (α+β) (n-1) τν, which corresponds to adjusting RSRP hysteresis margin for determining that a terminal is capable of performing communication link switching to Δp' =κΔp- (α+β) (n-1) τν]。
As shown in fig. 1, the method finally comprises a step 4 of adjusting RSRP hysteresis margin to Δp'.
Since the RSRP hysteresis margin is set too low, which may cause a ping-pong handover of the terminal, in some embodiments of the present invention, a minimum value of the RSRP hysteresis margin is preset, and the calculated dynamic RSRP hysteresis margin Δp 'is compared with the preset minimum value of the RSRP hysteresis margin Δp before the RSRP hysteresis margin is adjusted to Δp' min Comparing; when DeltaP'. Gtoreq.DeltaP min When the RSRP hysteresis margin is adjusted to delta P'; when (when)When the RSRP hysteresis margin is adjusted to delta P min 。
According to the invention, different weather conditions and corresponding weather influence factors are measured through the train-ground communication test in advance to form a table function, the weather influence factors can be quickly matched according to the weather conditions in the subsequent dynamic adjustment process, and then the RSRP hysteresis tolerance is dynamically adjusted in real time according to the weather influence factors and the terminal speed, so that the terminal can reliably switch communication links under different weather conditions and different speeds.
It should be noted that: the sequence of the embodiments of the present invention is only for description, and does not represent the advantages and disadvantages of the embodiments. And the foregoing description has been directed to specific embodiments of this disclosure, other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (2)
1. A method for dynamic optimization of RSRP hysteresis margin for communication link handoff decisions, said method comprising the steps of:
detecting weather conditions in real time, and acquiring corresponding weather influence factors according to the weather conditions，/>；
Real-time detection of terminal speed；
According to weather-influencing factorsAnd terminal speed->Calculating dynamic RSRP hysteresis margin +.>；
Adjusting RSRP hysteresis margin to；
The weather influencing factorThe acquisition method of (1) comprises the following steps:
pre-measuring path loss of transmitting power when terminal signal is transmitted to base station under normal weather conditionAnd path loss of transmitting power when terminal signal is transmitted to base station under different bad weather conditions +.>；
According toAnd->The weather influence factors (corresponding to different weather conditions) are obtained through comparative analysis>，/>Form weather conditions and weather influencing factors +.>A corresponding table function;
searching and matching corresponding weather influence factors in the table function according to the weather conditions monitored in real time；
The dynamic RSRP hysteresis marginThe calculation formula of (2) is as follows:
；
for the RSRP hysteresis margin set in correspondence with normal weather conditions,>for the rate of decay of the transmission power of the terminal signal with distance when it is transmitted to the current base station in normal weather conditions, +.>For the decay rate of the transmission power of the terminal signal with the distance when the terminal signal is transmitted to the target base station under normal weather condition, +.>Redundancy switch number set for ensuring reliable communication link switch of terminal in signal overlap area, < > for the terminal>Time required for each communication link handoff.
2. The dynamic optimization method for RSRP hysteresis margin for communication link handoff decision as claimed in claim 1, wherein the RSRP hysteresis margin is adjusted to bePreviously, the calculated dynamic RSRP hysteresis margin +.>Minimum value of hysteresis margin with preset RSRP>Comparing;
when (when)When the RSRP hysteresis margin is adjusted to +.>The method comprises the steps of carrying out a first treatment on the surface of the When->When the RSRP hysteresis margin is adjusted to。
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