CN113905422B - 5G cell switching method and related device - Google Patents
5G cell switching method and related device Download PDFInfo
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- CN113905422B CN113905422B CN202111242001.3A CN202111242001A CN113905422B CN 113905422 B CN113905422 B CN 113905422B CN 202111242001 A CN202111242001 A CN 202111242001A CN 113905422 B CN113905422 B CN 113905422B
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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
- H04W36/00835—Determination of neighbour cell lists
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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
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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- 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
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application discloses a 5G cell switching method, which comprises the following steps: determining the movement hysteresis of the terminal according to the movement speed of the terminal; determining neighbor cell admission delay of a neighbor cell of a service cell where the terminal is currently located according to target parameters of the neighbor cell of the service cell; screening candidate cells from each adjacent cell according to the movement delay of the terminal and the adjacent cell admission delay of the adjacent cell; comparing the signal level value of each candidate cell, and selecting the candidate cell with the largest signal level value as a target cell; and switching the terminal to the target cell. The method can effectively improve the success rate of switching. The application also discloses a switching device, equipment and a computer readable storage medium of the 5G cell, which have the technical effects.
Description
Technical Field
The application relates to the technical field of networks, in particular to a 5G cell switching method; also relates to a 5G cell switching device, equipment and a computer readable storage medium.
Background
At present, the main frequency band of 5G is generally above 2.6GHz, the diffraction capacity of the system is weak, and the coverage capacity of a single station is not strong. When the terminal is in a moving state, especially in high-speed movement, doppler frequency offset can be generated, so that the signal quality is seriously reduced, switching difficulty is generated, and customer perception is influenced. The handover procedure of 5G is similar to LTE, and thus, the handover method of 5G can be generally referred to LTE system. However, the current switching scheme does not consider whether the neighbor cell meets the admission requirement, and the processing of the terminal speed is simpler. Some switching methods even do not analyze the terminal speed, so that the mobile speed of the terminal cannot be matched, and the switching success rate is affected.
In view of this, how to improve the handover success rate has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The purpose of the application is to provide a 5G cell switching method, which can effectively improve the switching success rate. Another object of the present application is to provide a handover apparatus, an apparatus, and a computer readable storage medium for a 5G cell, which have the above technical effects.
In order to solve the above technical problems, the present application provides a method for switching a 5G cell, including:
determining the movement hysteresis of the terminal according to the movement speed of the terminal;
determining neighbor cell admission delay of a neighbor cell of a service cell where the terminal is currently located according to target parameters of the neighbor cell of the service cell;
screening candidate cells from each adjacent cell according to the movement delay of the terminal and the adjacent cell admission delay of the adjacent cell;
comparing the signal level value of each candidate cell, and selecting the candidate cell with the largest signal level value as a target cell;
and switching the terminal to the target cell.
Optionally, the determining the movement hysteresis of the terminal according to the movement speed of the terminal includes:
if the moving speed of the terminal is smaller than the maximum moving speed supported by the system and is larger than or equal to a speed matching threshold, calculating to obtain an exceeding limit value of the moving speed of the terminal according to the moving speed of the terminal, the maximum moving speed supported by the system and the speed matching threshold, and calculating to obtain moving hysteresis of the terminal according to the exceeding limit value of the moving speed of the terminal, a speed sensitive factor and a switching hysteresis parameter;
and if the moving speed of the terminal is smaller than the speed matching threshold, the moving hysteresis of the terminal is equal to the switching hysteresis parameter.
Optionally, the target parameter includes a resource utilization and a capacity threshold.
Optionally, determining the neighbor cell admission delay of the neighbor cell according to the target parameter of the neighbor cell of the serving cell where the terminal is currently located includes:
calculating to obtain a load reference value of the adjacent cell according to the resource utilization rate of the adjacent cell;
calculating a load comparison value of the adjacent cell according to the resource utilization rate of the adjacent cell and the capacity threshold;
calculating to obtain an intermediate value according to the load comparison value of the adjacent cell;
calculating to obtain a high load hysteresis parameter of the adjacent cell according to the load reference value, the load comparison value and the intermediate value;
calculating to obtain low-load hysteresis parameters of the adjacent cells according to the load comparison value and the intermediate value;
and calculating the neighbor cell admission delay of the neighbor cell according to the high load delay parameter and the low load delay parameter of the neighbor cell.
Optionally, the selecting a candidate cell from the neighboring cells according to the movement hysteresis of the terminal and the neighbor cell admission hysteresis of the neighboring cells includes:
calculating to obtain event lag in an A3 event according to the movement lag of the terminal and the neighbor cell admission lag;
after substituting the event hysteresis into the A3 event, judging whether the A3 event is established or not;
and if the A3 event is met, the adjacent cell is taken as the candidate cell.
In order to solve the above technical problem, the present application further provides a switching device of a 5G cell, including:
the first determining module is used for determining the movement hysteresis of the terminal according to the movement speed of the terminal;
the second determining module is used for determining neighbor cell admission delay of the neighbor cell according to the target parameters of the neighbor cell of the service cell where the terminal is currently located;
the screening module is used for screening candidate cells from the adjacent cells according to the movement delay of the terminal and the adjacent cell admission delay of the adjacent cells;
the selection module is used for comparing the signal level value of each candidate cell and selecting the candidate cell with the largest signal level value as a target cell;
and the switching module is used for switching the terminal to the target cell.
Optionally, the first determining module includes:
the first determining unit is used for calculating to obtain a terminal moving speed overrun value according to the moving speed of the terminal, the maximum moving speed supported by the system and the speed matching threshold if the moving speed of the terminal is smaller than the maximum moving speed supported by the system and is larger than or equal to the speed matching threshold, and calculating to obtain the moving hysteresis of the terminal according to the terminal moving speed overrun value, the speed sensitivity factor and the switching hysteresis parameter;
and the second determining unit is used for determining that the movement hysteresis of the terminal is equal to the switching hysteresis parameter if the movement speed of the terminal is smaller than the speed matching threshold.
Optionally, the second determining module includes:
a load reference value calculation unit, configured to calculate a load reference value of the neighboring cell according to a resource utilization rate of the neighboring cell;
the load comparison value calculation unit is used for calculating the load comparison value of the adjacent cell according to the resource utilization rate and the capacity threshold of the adjacent cell;
an intermediate value calculation unit, configured to calculate an intermediate value according to the load comparison value of the neighboring cell;
the high load hysteresis parameter calculation unit is used for calculating the high load hysteresis parameters of the adjacent cells according to the load reference value, the load comparison value and the intermediate value;
the low load hysteresis parameter calculation unit is used for calculating the low load hysteresis parameters of the adjacent cells according to the load comparison value and the intermediate value;
and the neighbor cell admission delay calculation unit is used for calculating neighbor cell admission delay of the neighbor cell according to the high load delay parameter and the low load delay parameter of the neighbor cell.
In order to solve the above technical problem, the present application further provides a switching device for a 5G cell, including:
a memory for storing a computer program;
a processor for implementing the steps of the method for handover of a 5G cell according to any of the preceding claims when executing the computer program.
To solve the above technical problem, the present application further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the handover method of a 5G cell as set forth in any one of the above.
The 5G cell switching method provided by the application comprises the following steps: determining the movement hysteresis of the terminal according to the movement speed of the terminal; determining neighbor cell admission delay of a neighbor cell of a service cell where the terminal is currently located according to target parameters of the neighbor cell of the service cell; screening candidate cells from each adjacent cell according to the movement delay of the terminal and the adjacent cell admission delay of the adjacent cell; comparing the signal level value of each candidate cell, and selecting the candidate cell with the largest signal level value as a target cell; and switching the terminal to the target cell. Therefore, the 5G cell switching method provided by the application analyzes the moving speed of the terminal, can better match the moving speed of the terminal, and realizes automatic adjustment of switching hysteresis. And meanwhile, the admission control is carried out on the adjacent cells, the admission mechanism of the adjacent cells is fully utilized, the purpose of optimizing the switching target is achieved, and the switching success rate can be effectively improved.
The 5G cell switching device, the 5G cell switching equipment and the computer readable storage medium have the technical effects.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings needed in the prior art and embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for switching a 5G cell according to an embodiment of the present application;
fig. 2 is a graph comparing a relationship between movement hysteresis and a movement speed of a terminal according to an embodiment of the present application;
FIG. 3 is a graph showing hysteresis change in a low-speed state according to an embodiment of the present disclosure;
fig. 4 is a comparison chart of a handover target cell at 80km/h for each algorithm provided in the embodiments of the present application;
FIG. 5 is a graph comparing average values of levels of neighboring cells of handover candidates at 80km/h for each algorithm according to the embodiment of the present application;
FIG. 6 is a graph comparing load averages of handover candidate neighbor cells at 80km/h for each algorithm provided in the embodiments of the present application;
fig. 7 is a schematic diagram of a switching device of a 5G cell according to an embodiment of the present application;
fig. 8 is a schematic diagram of a handover apparatus for a 5G cell according to an embodiment of the present application.
Detailed Description
The core of the application is to provide a 5G cell switching method, which can effectively improve the switching success rate. Another core of the present application is to provide a switching apparatus, a device, and a computer readable storage medium for a 5G cell, which all have the above technical effects.
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. 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 disclosure.
Referring to fig. 1, fig. 1 is a schematic flow chart of a 5G cell handover method (Adaptive Velocity based G Handover Algorithm, abbreviated as AVHA) according to an embodiment of the present application, and referring to fig. 1, the method mainly includes:
s101: determining the movement hysteresis of the terminal according to the movement speed of the terminal;
specifically, the present application is mainly directed to handover of a 5G cell, and this step aims to adaptively determine a movement hysteresis of a terminal according to a movement speed of the terminal in a movement scenario.
In a specific embodiment, the determining the movement hysteresis of the terminal according to the movement speed of the terminal includes:
if the moving speed of the terminal is smaller than the maximum moving speed supported by the system and is larger than or equal to a speed matching threshold, calculating to obtain an exceeding limit value of the moving speed of the terminal according to the moving speed of the terminal, the maximum moving speed supported by the system and the speed matching threshold, and calculating to obtain moving hysteresis of the terminal according to the exceeding limit value of the moving speed of the terminal, a speed sensitive factor and a switching hysteresis parameter;
and if the moving speed of the terminal is smaller than the speed matching threshold, the moving hysteresis of the terminal is equal to the switching hysteresis parameter.
Specifically, in this embodiment, by analyzing the moving speed of the terminal and setting the speed sensitivity factor, the automatic adjustment of the moving hysteresis is realized by means of the differentiated interval function. Let the moving speed of the terminal be V cr The maximum moving speed supported by the system is V max The speed matching threshold is Thr mb The speed sensitive factor is F mb The switching hysteresis parameter is Hs. If V is satisfied max ＞V cr ≥Thr mb Indicating that the frequency offset generated by the movement of the terminal has resulted in a degradation of the signal quality, at this time, the method is based on the formula first
Calculating to obtain the terminal moving speed exceeding the limit value, and then according to the formula +.>
And calculating to obtain the movement hysteresis of the terminal.
Namely:
wherein Ov mb The terminal movement speed exceeds the limit value, and Hs1 represents the movement hysteresis of the terminal.
If V is satisfied cr ＜Thr mb Indicating that the terminal is in a medium-low speed moving state, the moving hysteresis of the mobile terminal is equal to the switching hysteresis parameter, namely hs1=hs.
Wherein, as a preferred embodiment, the speed sensitive factor is greater than zero.
S102: determining neighbor cell admission delay of a neighbor cell of a service cell where the terminal is currently located according to target parameters of the neighbor cell of the service cell;
in a specific embodiment, the target parameter includes a resource utilization and a capacity threshold.
Specifically, gNB T ＝{gNB s ,gNB 1 ,…,gNB n -denotes a set of cells, gNB s For the current serving cell of the terminal, { gNB 1 ,…,gNB n And is the set of neighbor cells of the serving cell where the terminal is currently located. The cells adjacent to the serving cell where the terminal is currently located as the switching targets, besides the signal quality needs to meet the switching requirement, the capacity of the cells needs to be free from overload caused by switching, and therefore, the embodiment determines the adjacent cell admission delay of each serving cell according to the resource utilization rate and the capacity threshold of the adjacent cells.
In a specific embodiment, determining the neighbor cell admission delay of the neighbor cell according to the target parameter of the neighbor cell of the serving cell where the terminal is currently located includes:
calculating to obtain a load reference value of the adjacent cell according to the resource utilization rate of the adjacent cell;
calculating a load comparison value of the adjacent cell according to the resource utilization rate of the adjacent cell and the capacity threshold;
calculating to obtain an intermediate value according to the load comparison value of the adjacent cell;
calculating to obtain a high load hysteresis parameter of the adjacent cell according to the load reference value, the load comparison value and the intermediate value;
calculating to obtain low-load hysteresis parameters of the adjacent cells according to the load comparison value and the intermediate value;
and calculating the neighbor cell admission delay of the neighbor cell according to the high load delay parameter and the low load delay parameter of the neighbor cell.
Specifically, neighboring cell gNB is set i The resource utilization rate of i epsilon 1..n is Ld i The capacity threshold is Ld th . According to formula BLd i ＝log(10*Ld i +1) calculating to obtain adjacent cell gNB i A load reference value of (2); BLd i Represents the load reference value, log (·) is a base 10 logarithmic function. According to formula RLd i ＝Ld i -Ld th Calculating to obtain adjacent cell gNB i Is a load comparison value of (a); RLd (RLd) i Representing the load comparison value. According to the formula Pm i ＝min(RLd i 0) calculating to obtain an intermediate value; pm (Pm) i Representing intermediate values.
Based on this, according to the formula
Calculating to obtain adjacent cell gNB i High load hysteresis parameters of (a), namely:
According to the formula
Calculating to obtain adjacent cell gNB i Low load hysteresis parameters of (a), namely:
Further, according to the formula hs2=hah+hel, the neighbor admission delay of the neighbor cell i is calculated, namely:
If Ld i ≥Ld th Then Pm is i =0, hal=0, hs2=hah. If Ld i ＜Ld th Then Pm is i ＝RLd i ，HaL＝log(11)，Hs2＝log(11)+HaH。
S103: screening candidate cells from each adjacent cell according to the movement delay of the terminal and the adjacent cell admission delay of the adjacent cell;
specifically, determining movement delay of a terminal and neighbor cell admission delay of each neighbor cell, further screening candidate cells from each neighbor cell according to the movement delay of the terminal and the neighbor cell admission delay of the neighbor cell, and adding the candidate cells into a switching candidate set.
In a specific embodiment, the selecting a candidate cell from the neighboring cells according to the movement hysteresis of the terminal and the neighboring cell admission hysteresis of the neighboring cells includes:
calculating to obtain event lag in an A3 event according to the movement lag of the terminal and the neighbor cell admission lag;
after substituting the event hysteresis into the A3 event, judging whether the A3 event is established or not;
and if the A3 event is met, the adjacent cell is taken as the candidate cell.
Specifically, the A3 event refers to M n +O fn +O cn -Hys＞M s +O fs +O cs +off; wherein M is n For the measurement results of neighboring cells (primaryCell performance index to include signal quality level, etc.), O fn For a frequency specific offset on the adjacent cell frequency, O cn For a specific offset of the neighboring cell (if this configuration is not present, it is set to zero), M s O is the measurement result of the service cell where the terminal is currently located fs For the frequency specific offset on the frequency of the serving cell where the terminal is currently located, O cs Hys is the event hysteresis of the A3 event and Off is the inexpensive parameter of the A3 event for the specific offset of the serving cell in which the terminal is currently located.
After the event hysteresis Hys is calculated and substituted into the A3 event, if the A3 event is established, the corresponding adjacent cell is a candidate cell. The method for calculating the event lag in the A3 event according to the movement lag of the terminal and the neighbor admission lag may be to sum the movement lag of the terminal and the neighbor admission lag, and take the obtained sum as the event lag, i.e. let hys=hs1+hs2.
S104: comparing the signal level value of each candidate cell, and selecting the candidate cell with the largest signal level value as a target cell;
s105: and switching the terminal to the target cell.
Specifically, after candidate cells are screened out from each adjacent cell, the signal level value of each candidate cell is further compared, the candidate cell with the largest signal level value is selected as a target cell, and the terminal is switched to the target cell from the current serving cell.
In summary, according to the 5G cell switching method provided by the present application, the moving speed of the terminal is analyzed, so that the moving speed of the terminal can be better matched, and automatic adjustment of switching hysteresis is realized. And meanwhile, the admission control is carried out on the adjacent cells, the admission mechanism of the adjacent cells is fully utilized, the purpose of optimizing the switching target is achieved, and the switching success rate can be effectively improved.
The following describes, by way of a specific example, a handover method for a 5G cell provided in the present application:
the mobile speed of the terminal is assumed to be 80km/h, assuming that 7 5G serving cells are included in total. The load and level values of each 5G serving cell are shown in tables 1 and 2, respectively:
TABLE 1
| Cell load | Load1 | Load2 | Load3 | Load4 | Load5 | Load6 | Load7 |
| gNB s | 0.65 | 0.55 | 0.45 | 0.63 | 0.78 | 0.83 | 0.44 |
| gNB 1 | 0.25 | 0.63 | 0.45 | 0.51 | 0.57 | 0.73 | 0.54 |
| gNB 2 | 0.35 | 0.54 | 0.56 | 0.42 | 0.75 | 0.25 | 0.67 |
| gNB 3 | 0.24 | 0.34 | 0.42 | 0.77 | 0.63 | 0.37 | 0.76 |
| gNB 4 | 0.86 | 0.81 | 0.38 | 0.69 | 0.83 | 0.68 | 0.85 |
| gNB 5 | 0.73 | 0.69 | 0.42 | 0.21 | 0.48 | 0.89 | 0.78 |
| gNB 6 | 0.24 | 0.41 | 0.76 | 0.48 | 0.88 | 0.79 | 0.66 |
TABLE 2
In tables 1 and 2, gNBs represents the 5G serving cell in which the terminal is currently located, gNB 1 ～gNB 6 Representing the neighboring cell of the 5G serving cell where the terminal is currently located.
Basic data such as the movement speed of the terminal are shown in table 3:
TABLE 3 Table 3
Thereby, in the scene that the moving speed of the terminal is 80km/h, V is satisfied max ＞V cr ≥Thr mb Therefore, the movement speed overrun value of the terminal is calculated
And further calculate the movement hysteresis of the terminal
And calculating neighbor cell admission delay of each neighbor cell in the following seven switching scenes according to the table 1.
Switching scenario 1: {0.50,039,0.51,0.98,0.92,0.51};
switching scenario 2: {0.86,0.24,0.40,0.96,0.90,0.33};
switching scenario 3: {0.3,0.22,0.33,0.36,0.33,0.93};
switching scenario 4: {0.26,0.33,0.94,0.9,0.55,0.28};
switching scenario 5: {0.22,0.93,0.86,0.97,0.28,0.99};
switching scenario 6: {0.92,0.5,0.37,0.89,1,0.95};
switching scenario 7: {0.24,0.89,0.93,0.98,0.94,0.88}.
The numbers in each switching scene respectively represent neighbor admission delay of different neighbor cells. For example, in handover scenario 1, 0.50,039,0.51,0.98,0.92, and 0.51 represent neighbor admission lags for neighbor cells gNB1 to gNB6, respectively.
Furthermore, hys under seven switching scenes are correspondingly obtained AVHA Is the value of:
{2.91,2.8,2.92,3.4,3,33,2.92}；
{3.28,2.65,2.81,3,37,3,31,2.75}；
{2.72,2.64,2.74,2.77,2.74,3.35}；
{2.67,2.74,3.35,3,31,2.96,2.69}；
{2.63,3.34,3.28,3.38,2.69,3.41}；
{3.33,2.91,2.78,3.31,3.41,3.36}；
{2.65,3.3,3.35,3.39,3.36,3.3}。
further, candidate neighbor cell sets capable of satisfying the A3 event under different handover scenarios are { gNB }, respectively 2 ,gNB 6 }，{gNB 1 ,gNB 2 ,gNB 3 ,gNB 6 }，{gNB 2 }，{gNB 3 }，{gNB 1 ,gNB 2 ,gNB 3 ,gNB 4 ,gNB 5 ,gNB 6 }，{gNB 2 ,gNB 3 ,gNB 4 ,gNB 5 { gNB } and { gNB } 1 ,gNB 4 ,gNB 5 }；
For each candidate neighbor cell set, the selected target cells are respectively gNB according to the level value 2 ，gNB 3 ，gNB 2 ，gNB 3 ，gNB 1 ，gNB 2 ，gNB 5 。
The following compares the AVHA algorithm provided in the present application with the conventional A3 algorithm and JIHA algorithm through MATLAB simulation experiments:
the data parameters may take the contents of tables 1 to 3, and the target samples 7 times. The relation between AVHA hysteresis and moving speed, hysteresis in low speed state, and target cell, candidate cell level average value and candidate cell load condition in 80km/h over threshold moving speed are shown in figures 2-6.
Fig. 2 shows the relationship between the movement hysteresis and the movement speed of the terminal. As can be seen from fig. 2, the movement hysteresis of the AVHA algorithm is the same as that of the conventional A3 algorithm and remains unchanged when the speed threshold is not exceeded. When the terminal speed exceeds the speed threshold, the movement hysteresis of the AVHA algorithm is adaptively reduced due to the frequency offset so as to prevent the drop of the signal level value from causing the call drop of the terminal.
Figure 3 shows the hysteresis change of three algorithms in the low speed state. As can be seen from fig. 3, the hysteresis of the AVHA algorithm and the conventional A3 algorithm remains unchanged, and the JIHA algorithm dynamically adjusts the handover hysteresis all the time because of focusing on the cell handover failure rate.
Figure 4 shows the target neighbor for three algorithms in the 80km/h case. As can be seen from fig. 4, in the last 4 samples, the JIHA algorithm is not adjacent to the handover failure rate, which indicates that the JIHA algorithm is not suitable for the middle-high speed situation, but the conventional A3 algorithm has similar problems in the 2 nd, 3 rd and 4 th samples, mainly because the handover delay is insensitive to the moving speed of the terminal.
Figure 5 shows the average neighbor level for three algorithms in the 80km/h case. In mid-high speed mobile handover, the level value is the first factor to be considered, since it decides whether or not the handover can be successfulThen consider the problem of neighbor cell loading. The main difference is that the 3 rd sampling is carried out, the switching of the traditional A3 algorithm fails, and the JIHA algorithm selects gNB 6 AVHA algorithm selects gNB 3 . As can be seen from tables 1 and 2, neighbor gNB 3 Level value-111 dBm higher than gNB 6 Is-116 dBm, and gNB 3 Load 0.42 to gNB 6 Is lower than 0.76 and therefore the AVHA algorithm is relatively better and more reasonable.
Figure 6 shows the neighbor load for three algorithms in the 80km/h case. The three algorithms are shown to have the largest difference at the 4 th sampling, and the JIHA algorithm selects gNB 2 AVHA algorithm selects gNB 4 Neighbor gNB 4 The level value of-94 dBm is higher than gNB 2 Is-95 dBm, but gNB 4 Is slightly higher than gNB in load 0.69 2 Is 0.42 of (1), JIHA algorithm selection gNB 2 As a result of which subsequent sampling successive handovers fail.
The application also provides a 5G cell switching device, which can be referred to in the following in correspondence with the above-described method. Referring to fig. 7, fig. 7 is a schematic diagram of a switching apparatus of a 5G cell according to an embodiment of the present application, and in combination with fig. 7, the apparatus includes:
a first determining module 10, configured to determine a movement hysteresis of a terminal according to a movement speed of the terminal;
a second determining module 20, configured to determine neighbor cell admission delay of a neighbor cell according to a target parameter of the neighbor cell of a serving cell where the terminal is currently located;
a screening module 30, configured to screen candidate cells from each neighboring cell according to the movement hysteresis of the terminal and the neighboring cell admission hysteresis of the neighboring cell;
a selection module 40, configured to compare signal level values of the candidate cells, and select the candidate cell with the largest signal level value as a target cell;
and the switching module 50 is used for switching the terminal to the target cell.
On the basis of the above embodiment, as a specific implementation manner, the first determining module 10 includes:
the first determining unit is used for calculating to obtain a terminal moving speed overrun value according to the moving speed of the terminal, the maximum moving speed supported by the system and the speed matching threshold if the moving speed of the terminal is smaller than the maximum moving speed supported by the system and is larger than or equal to the speed matching threshold, and calculating to obtain the moving hysteresis of the terminal according to the terminal moving speed overrun value, the speed sensitivity factor and the switching hysteresis parameter;
and the second determining unit is used for determining that the movement hysteresis of the terminal is equal to the switching hysteresis parameter if the movement speed of the terminal is smaller than the speed matching threshold.
Based on the foregoing embodiment, as a specific implementation manner, the target parameters include a resource utilization rate and a capacity threshold.
On the basis of the above embodiment, the second determining module 20 includes, as a specific implementation manner:
a load reference value calculation unit, configured to calculate a load reference value of the neighboring cell according to a resource utilization rate of the neighboring cell;
the load comparison value calculation unit is used for calculating the load comparison value of the adjacent cell according to the resource utilization rate and the capacity threshold of the adjacent cell;
an intermediate value calculation unit, configured to calculate an intermediate value according to the load comparison value of the neighboring cell;
the high load hysteresis parameter calculation unit is used for calculating the high load hysteresis parameters of the adjacent cells according to the load reference value, the load comparison value and the intermediate value;
the low load hysteresis parameter calculation unit is used for calculating the low load hysteresis parameters of the adjacent cells according to the load comparison value and the intermediate value;
and the neighbor cell admission delay calculation unit is used for calculating neighbor cell admission delay of the neighbor cell according to the high load delay parameter and the low load delay parameter of the neighbor cell.
Based on the above embodiment, as a specific implementation manner, the screening module 30 includes:
the calculation unit is used for calculating event lag in an A3 event according to the movement lag of the terminal and the neighbor cell admission lag;
the judging unit is used for judging whether the A3 event is established or not after substituting the event hysteresis into the A3 event;
and the determining unit is used for taking the adjacent cell as the candidate cell if the A3 event is satisfied.
According to the 5G cell switching device, the moving speed of the terminal is analyzed, the moving speed of the terminal can be better matched, and automatic adjustment of switching hysteresis is realized. And meanwhile, the admission control is carried out on the adjacent cells, the admission mechanism of the adjacent cells is fully utilized, the purpose of optimizing the switching target is achieved, and the switching success rate can be effectively improved.
The present application also provides a handover apparatus for a 5G cell, which includes a memory 1 and a processor 2, as shown with reference to fig. 8.
A memory 1 for storing a computer program;
a processor 2 for executing a computer program to perform the steps of:
determining the movement hysteresis of the terminal according to the movement speed of the terminal; determining neighbor cell admission delay of a neighbor cell of a service cell where the terminal is currently located according to target parameters of the neighbor cell of the service cell; screening candidate cells from each adjacent cell according to the movement delay of the terminal and the adjacent cell admission delay of the adjacent cell; comparing the signal level value of each candidate cell, and selecting the candidate cell with the largest signal level value as a target cell; and switching the terminal to the target cell.
For the description of the apparatus provided in the present application, reference is made to the above method embodiments, and the description is omitted herein.
The present application also provides a computer readable storage medium having a computer program stored thereon, which when executed by a processor, performs the steps of:
determining the movement hysteresis of the terminal according to the movement speed of the terminal; determining neighbor cell admission delay of a neighbor cell of a service cell where the terminal is currently located according to target parameters of the neighbor cell of the service cell; screening candidate cells from each adjacent cell according to the movement delay of the terminal and the adjacent cell admission delay of the adjacent cell; comparing the signal level value of each candidate cell, and selecting the candidate cell with the largest signal level value as a target cell; and switching the terminal to the target cell.
The computer readable storage medium may include: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
For the description of the computer-readable storage medium provided in the present application, reference is made to the above method embodiments, and the description is omitted herein.
In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the apparatus, device and computer readable storage medium of the embodiment disclosure, since it corresponds to the method of the embodiment disclosure, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The technical scheme provided by the application is described in detail. Specific examples are set forth herein to illustrate the principles and embodiments of the present application, and the description of the examples above is only intended to assist in understanding the methods of the present application and their core ideas. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
Claims (6)
1. A method for switching a 5G cell, comprising:
determining the movement hysteresis of the terminal according to the movement speed of the terminal;
determining neighbor cell admission delay of a neighbor cell of a service cell where the terminal is currently located according to target parameters of the neighbor cell of the service cell;
screening candidate cells from each adjacent cell according to the movement delay of the terminal and the adjacent cell admission delay of the adjacent cell;
comparing the signal level value of each candidate cell, and selecting the candidate cell with the largest signal level value as a target cell;
switching the terminal to the target cell;
the determining the movement hysteresis of the terminal according to the movement speed of the terminal comprises:
if the movement speed of the terminal is less than the maximum movement speed supported by the system and greater than or equal to a speed matching threshold,then according to
Calculating to obtain the movement hysteresis of the terminal; hs1 is the movement delay of the terminal, V cr V is the moving speed of the terminal max Thr is the maximum movement speed supported by the system mb For speed match threshold, F mb Hs is a switching hysteresis parameter as a speed sensitive factor;
if the moving speed of the terminal is smaller than the speed matching threshold, the moving hysteresis of the terminal is equal to the switching hysteresis parameter;
the determining the neighbor cell admission delay of the neighbor cell according to the target parameters of the neighbor cell of the serving cell where the terminal is currently located comprises:
according to
Calculating to obtain the receiving area admittance delay of the adjacent cell;
hs2 is neighbor admission delay, ld of neighbor cells i Ld is the resource utilization rate of the ith neighboring cell th Is a capacity threshold.
2. The method of handover of a 5G cell according to claim 1, wherein the target parameters include a resource utilization and a capacity threshold.
3. The method for switching 5G cells according to claim 1, wherein said screening candidate cells from each of said neighboring cells based on said movement hysteresis of said terminal and said neighbor admission hysteresis of said neighboring cells comprises:
calculating to obtain event lag in an A3 event according to the movement lag of the terminal and the neighbor cell admission lag;
after substituting the event hysteresis into the A3 event, judging whether the A3 event is established or not;
and if the A3 event is met, the adjacent cell is taken as the candidate cell.
4. A 5G cell handover apparatus, comprising:
the first determining module is used for determining the movement hysteresis of the terminal according to the movement speed of the terminal;
the second determining module is used for determining neighbor cell admission delay of the neighbor cell according to the target parameters of the neighbor cell of the service cell where the terminal is currently located;
the screening module is used for screening candidate cells from the adjacent cells according to the movement delay of the terminal and the adjacent cell admission delay of the adjacent cells;
the selection module is used for comparing the signal level value of each candidate cell and selecting the candidate cell with the largest signal level value as a target cell;
a switching module, configured to switch the terminal to the target cell;
the first determining module includes:
a first determining unit, configured to, if the moving speed of the terminal is less than a maximum moving speed supported by a system and greater than or equal to a speed matching threshold, according to
Calculating to obtain the movement hysteresis of the terminal; hs1 is the movement delay of the terminal, V cr V is the moving speed of the terminal max Thr is the maximum movement speed supported by the system mb For speed match threshold, F mb Hs is a switching hysteresis parameter as a speed sensitive factor;
a second determining unit, configured to, if the movement speed of the terminal is less than the speed matching threshold, determine that movement hysteresis of the terminal is equal to the switching hysteresis parameter;
the second determining module is specifically configured to:
according to
Calculating to obtain the receiving area admittance delay of the adjacent cell;
hs2 is neighbor admission delay, ld of neighbor cells i Ld is the resource utilization rate of the ith neighboring cell th Is a capacity threshold.
5. A handover apparatus for a 5G cell, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the 5G cell handover method according to any of claims 1 to 3 when executing said computer program.
6. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the 5G cell handover method according to any of claims 1 to 3.
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