CN113905422A - Switching method of 5G cell and related device - Google Patents

Switching method of 5G cell and related device Download PDF

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CN113905422A
CN113905422A CN202111242001.3A CN202111242001A CN113905422A CN 113905422 A CN113905422 A CN 113905422A CN 202111242001 A CN202111242001 A CN 202111242001A CN 113905422 A CN113905422 A CN 113905422A
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cell
terminal
delay
load
calculating
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CN113905422B (en
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肖清华
朱东照
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Huaxin Consulting Co Ltd
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Huaxin Consulting Co Ltd
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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
    • 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
    • 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
    • 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

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Abstract

The application discloses a switching method of a 5G cell, which comprises the following steps: determining the movement delay of the terminal according to the movement speed of the terminal; determining neighbor cell admission delay of a neighbor cell according to target parameters of the neighbor cell of a serving cell in which the terminal is currently located; screening candidate cells from each adjacent cell according to the mobility delay of the terminal and the adjacent cell admission delay of the adjacent cell; comparing the signal level values of the candidate cells, 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

Switching method of 5G cell and related device
Technical Field
The present application relates to the field of network technologies, and in particular, to a method for switching a 5G cell; it also relates to a handover apparatus, a device and a computer readable storage medium for a 5G cell.
Background
At present, 5G mainstream frequency ranges are generally over 2.6GHz, the diffraction capability of the system is weak, and the coverage capability of a single station is not strong. When the terminal is in a mobile state, particularly, when the terminal moves at a high speed, doppler frequency offset is generated, so that the signal quality is seriously reduced, the switching is difficult, and the perception of a client is influenced. The handover procedure of 5G is similar to LTE, and thus, the handover method of 5G can be generally referred to LTE systems. However, the current handover scheme does not consider whether the neighboring cell meets the admission requirement, and the processing of the terminal speed is also simpler. Some switching methods even do not analyze the terminal speed, so that the moving speed of the terminal cannot be matched, and the switching success rate is influenced.
In view of the above, how to improve the handover success rate has become an urgent technical problem to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a switching method of a 5G cell, which can effectively improve the success rate of switching. Another object of the present application is to provide a handover apparatus, a device and a computer readable storage medium for a 5G cell, all of which have the above technical effects.
In order to solve the above technical problem, the present application provides a handover method for a 5G cell, including:
determining the movement delay of the terminal according to the movement speed of the terminal;
determining neighbor cell admission delay of a neighbor cell according to target parameters of the neighbor cell of a serving cell in which the terminal is currently located;
screening candidate cells from each adjacent cell according to the mobility delay of the terminal and the adjacent cell admission delay of the adjacent cell;
comparing the signal level values of the candidate cells, 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 motion hysteresis of the terminal according to the moving speed of the terminal includes:
if the moving speed of the terminal is less than the maximum moving speed supported by a system and is greater than or equal to a speed matching threshold, calculating to obtain a terminal moving speed over-limit value 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 the moving delay of the terminal according to the terminal moving speed over-limit value, a speed sensitive factor and a switching delay parameter;
if the moving speed of the terminal is less than the speed matching threshold, the moving delay of the terminal is equal to the switching delay parameter.
Optionally, the target parameters include resource utilization and a capacity threshold.
Optionally, determining the admission delay of the neighboring cell according to the target parameter of the neighboring 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 to obtain 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 a middle 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 a low-load hysteresis parameter of the adjacent cell 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 screening candidate cells from each of the neighboring cells according to the mobility hysteresis of the terminal and the admission hysteresis of the neighboring cells includes:
calculating to obtain an event delay in the A3 event according to the movement delay of the terminal and the neighbor cell admission delay;
after substituting the event lag into the A3 event, judging whether the A3 event is established;
and if the A3 event is satisfied, taking the adjacent cell as the candidate cell.
In order to solve the above technical problem, the present application further provides a handover apparatus for a 5G cell, including:
the first determining module is used for determining the movement delay of the terminal according to the movement speed of the terminal;
a second determining module, configured to determine, according to a target parameter of a neighboring cell of a serving cell in which the terminal is currently located, a neighboring cell admission delay of the neighboring cell;
a screening module, configured to screen candidate cells from each neighboring cell according to the mobility delay of the terminal and the neighboring cell admission delay of the neighboring cell;
a selecting module, 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 is used for switching the terminal to the target cell.
Optionally, 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 is greater than or equal to a speed matching threshold, calculate a terminal moving speed exceeding limit according to the moving speed of the terminal, the maximum moving speed supported by the system, and the speed matching threshold, and calculate a moving delay of the terminal according to the terminal moving speed exceeding limit, a speed sensitivity factor, and a handover delay parameter;
a second determining unit, configured to determine that a movement hysteresis of the terminal is equal to the handover hysteresis parameter if the movement speed of the terminal is less 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 the resource utilization rate of the neighboring cell;
a load comparison value calculating unit, configured to calculate a load comparison value of the neighboring cell according to the resource utilization rate of the neighboring cell and a capacity threshold;
the intermediate value calculating unit is used for calculating an intermediate value according to the load comparison value of the adjacent cell;
a high-load hysteresis parameter calculating unit, configured to calculate a high-load hysteresis parameter of the neighboring cell according to the load reference value, the load comparison value, and the intermediate value;
a low-load hysteresis parameter calculating unit, configured to calculate a low-load hysteresis parameter of the neighboring cell according to the load comparison value and the intermediate value;
and the neighbor cell admission delay calculating unit is used for 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.
In order to solve the above technical problem, the present application further provides a handover device for a 5G cell, including:
a memory for storing a computer program;
a processor for implementing the steps of the handover method for a 5G cell as described in any one of the above when executing the computer program.
In order to solve the above technical problem, the present application further provides a computer-readable storage medium, having a computer program stored thereon, where the computer program is executed by a processor to implement the steps of the handover method for a 5G cell as described in any one of the above.
The handover method for the 5G cell provided by the application comprises the following steps: determining the movement delay of the terminal according to the movement speed of the terminal; determining neighbor cell admission delay of a neighbor cell according to target parameters of the neighbor cell of a serving cell in which the terminal is currently located; screening candidate cells from each adjacent cell according to the mobility delay of the terminal and the adjacent cell admission delay of the adjacent cell; comparing the signal level values of the candidate cells, 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 delay. Meanwhile, access control is carried out on the adjacent cells, the access mechanism of the adjacent cells is fully utilized, the aim of optimizing the switching target is achieved, and the switching success rate can be effectively improved.
The switching device, the equipment and the computer readable storage medium of the 5G cell have the technical effects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flowchart of a handover method for a 5G cell according to an embodiment of the present disclosure;
fig. 2 is a comparison graph of a relation between a movement delay and a terminal movement speed according to an embodiment of the present disclosure;
FIG. 3 is a graph comparing the hysteresis change in the low speed state according to the embodiment of the present application;
FIG. 4 is a comparison graph of handover target cells at 80km/h for various algorithms provided in the embodiments of the present application;
FIG. 5 is a comparison diagram of the average value of the levels of candidate handover neighboring cells under 80km/h for each algorithm provided in the embodiment of the present application;
FIG. 6 is a comparison graph of load means of candidate handover neighbors under 80km/h for various algorithms provided in the embodiments of the present application;
fig. 7 is a schematic diagram of a handover apparatus of a 5G cell according to an embodiment of the present application;
fig. 8 is a schematic diagram of a handover apparatus of a 5G cell according to an embodiment of the present application.
Detailed Description
The core of the application is to provide a switching method of a 5G cell, which can effectively improve the success rate of switching. Another core of the present application is to provide a handover apparatus, a device and a computer-readable storage medium for a 5G cell, all of which have the above technical effects.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in 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 obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic flow chart of a Handover method (Adaptive vector based 5G Handover Algorithm, AVHA for short) for a 5G cell according to an embodiment of the present application, and as shown in fig. 1, the method mainly includes:
s101: determining the movement delay 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 the step is to adaptively determine the movement delay of the terminal according to the movement speed of the terminal in a moving scene.
In a specific embodiment, the determining the motion hysteresis of the terminal according to the moving speed of the terminal includes:
if the moving speed of the terminal is less than the maximum moving speed supported by a system and is greater than or equal to a speed matching threshold, calculating to obtain a terminal moving speed over-limit value 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 the moving delay of the terminal according to the terminal moving speed over-limit value, a speed sensitive factor and a switching delay parameter;
if the moving speed of the terminal is less than the speed matching threshold, the moving delay of the terminal is equal to the switching delay parameter.
Specifically, in the embodiment, the automatic adjustment of the movement delay is realized by analyzing the movement speed of the terminal, setting the speed sensitive factor and using the differentiated interval function. Let the moving speed of the terminal be VcrMaximum move supported by the systemWith a dynamic velocity VmaxThe speed matching threshold is ThrmbThe velocity sensitivity factor is FmbThe handoff hysteresis parameter is Hs. If V is satisfiedmax＞Vcr≥ThrmbWhen the frequency deviation generated by the terminal movement causes the signal quality to be reduced, firstly, the formula is based on
Figure BDA0003319511660000061
Calculating to obtain the terminal moving speed over-limit value, and further according to a formula
Figure BDA0003319511660000062
And calculating to obtain the movement delay of the terminal.
Namely:
Figure BDA0003319511660000063
wherein, OvmbIndicating that the terminal moving speed exceeds the limit value, Hs1 indicating the movement delay of the terminal.
If V is satisfiedcr＜ThrmbWhen the mobile terminal is in the medium-low speed moving state, the moving delay of the mobile terminal is equal to the handoff delay parameter, that is, Hs1 is Hs.
Wherein, as a preferred embodiment, the speed sensitivity factor is greater than zero.
S102: determining neighbor cell admission delay of a neighbor cell according to target parameters of the neighbor cell of a serving cell in which the terminal is currently located;
in a specific embodiment, the target parameters include resource utilization and a capacity threshold.
Specifically, in gNBT＝{gNBs,gNB1,…,gNBnDenotes the set of cells, gNBsFor the serving cell in which the terminal is currently located, { gNB }1,…,gNBnAnd the cell is the set of the adjacent cells of the service cell where the terminal is currently located. For the cells adjacent to the serving cell where the terminal is currently located as the handover targets, in addition to the requirement that the signal quality satisfies the handover requirement, the capacity of the cell is not overloaded due to the handoverAnd determining the adjacent cell admission delay of each service cell according to the resource utilization rate and the capacity threshold of the adjacent cell.
In a specific embodiment, determining the admission delay of the neighboring cell according to the target parameter of the neighboring 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 to obtain 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 a middle 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 a low-load hysteresis parameter of the adjacent cell 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, let neighboring cell gNBiI belongs to 1.. n, and the resource utilization rate is LdiCapacity threshold is Ldth. According to the formula BLdi＝log(10*Ldi+1) calculating to obtain the adjacent cell gNBiA load reference value of (d); BLdiRepresenting the load reference value, log (-) is a base-10 logarithmic function. According to the formula RLdi＝Ldi-LdthCalculating to obtain the adjacent cell gNBiA load comparison value of (a); RLdiRepresenting the load comparison value. According to the formula Pmi＝min(RLdi0) calculating to obtain a middle value; pmiRepresenting an intermediate value.
On the basis of the formula
Figure BDA0003319511660000071
Calculating to obtain the adjacent cell gNBiHigh load hysteresis ofThe parameters, namely:
Figure BDA0003319511660000072
HaH denotes the high load hysteresis parameter.
According to the formula
Figure BDA0003319511660000073
Calculating to obtain the adjacent cell gNBiLow load hysteresis parameters of (a), namely:
Figure BDA0003319511660000074
HaL represents the low load hysteresis parameter.
Further, the neighbor cell admission delay of the neighbor cell i is calculated according to the formula Hs2 ═ HaH + HaL, that is:
Figure BDA0003319511660000075
hs2 denotes neighbor admission hysteresis.
If Ldi≥LdthThen PmiH 2 h, h 0, hl 0. If Ldi＜LdthThen Pmi＝RLdi，HaL＝log(11)，Hs2＝log(11)+HaH。
S103: screening candidate cells from each adjacent cell according to the mobility delay of the terminal and the adjacent cell admission delay of the adjacent cell;
specifically, the mobility delay of the terminal and the neighbor cell admission delay of each neighbor cell are determined, and further, according to the mobility delay of the terminal and the neighbor cell admission delay of the neighbor cells, candidate cells are screened from each neighbor cell, and the candidate cells are added into a handover candidate set.
In a specific implementation manner, the screening candidate cells from each of the neighboring cells according to the mobility hysteresis of the terminal and the neighboring cell admission hysteresis of the neighboring cells includes:
calculating to obtain an event delay in the A3 event according to the movement delay of the terminal and the admission delay of the adjacent cell;
after substituting the event lag into the A3 event, judging whether the A3 event is established;
and if the A3 event is satisfied, taking the adjacent cell as the candidate cell.
Specifically, the A3 event refers to Mn+Ofn+Ocn-Hys＞Ms+Ofs+Ocs+ Off; wherein M isnIs the measurement result of the adjacent cell (mainly including cell performance index such as signal quality level), OfnFor frequency-specific offsets, O, on frequencies of adjacent cellscnFor a particular offset of a neighboring cell (set to zero if not configured), MsAs a result of the measurement of the serving cell in which the terminal is currently located, OfsFor a frequency-specific offset, O, on the frequency of the serving cell in which the terminal is currently locatedcsFor a certain offset of the serving cell where the terminal is currently located, Hys is the event lag of the A3 event and Off is a cheap parameter of the A3 event.
And after the event delay Hys is obtained by calculation and substituted into the event A3, if the event A3 is true, the corresponding adjacent cell is a candidate cell. The manner of calculating the event hysteresis in the event a3 according to the mobility hysteresis of the terminal and the admission hysteresis of the neighboring cell may be to sum the mobility hysteresis of the terminal and the admission hysteresis of the neighboring cell, and use the sum as the event hysteresis, that is, to say, hy is Hs1+ Hs 2.
S104: comparing the signal level values of the candidate cells, 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 from each neighboring cell, signal level values of the candidate cells are further compared, the candidate cell with the largest signal level value is selected as a target cell, and the terminal is switched from the current serving cell to the target cell.
In summary, the 5G cell handover method provided by the present application analyzes the moving speed of the terminal, and can better match the moving speed of the terminal, thereby implementing automatic adjustment of handover delay. Meanwhile, access control is carried out on the adjacent cells, the access mechanism of the adjacent cells is fully utilized, the aim of optimizing the switching target is achieved, and the switching success rate can be effectively improved.
The following describes a handover method of a 5G cell provided by the present application by using a specific example:
the mobile speed of the terminal is assumed to be 80km/h, which includes 7 5G serving cells in total. The load and level value of each 5G serving cell are shown in table 1 and table 2, respectively:
TABLE 1
Cell load Load1 Load2 Load3 Load4 Load5 Load6 Load7
gNBs 0.65 0.55 0.45 0.63 0.78 0.83 0.44
gNB1 0.25 0.63 0.45 0.51 0.57 0.73 0.54
gNB2 0.35 0.54 0.56 0.42 0.75 0.25 0.67
gNB3 0.24 0.34 0.42 0.77 0.63 0.37 0.76
gNB4 0.86 0.81 0.38 0.69 0.83 0.68 0.85
gNB5 0.73 0.69 0.42 0.21 0.48 0.89 0.78
gNB6 0.24 0.41 0.76 0.48 0.88 0.79 0.66
TABLE 2
Figure BDA0003319511660000091
In tables 1 and 2, gNBs indicates the 5G serving cell in which the terminal is currently located, and gNB1～gNB6Indicating the neighboring cell of the 5G serving cell in which the terminal is currently located.
The basic data such as the moving speed of the terminal are shown in table 3:
TABLE 3
Figure BDA0003319511660000092
Figure BDA0003319511660000101
Therefore, V is satisfied under the scene that the moving speed of the terminal is 80km/hmax＞Vcr≥ThrmbThus calculating the moving speed overrun value of the terminal
Figure BDA0003319511660000102
And then calculating to obtain the movement delay of the terminal
Figure BDA0003319511660000103
The neighbor admission delay of each neighbor cell under the following seven handover scenarios is calculated according to table 1.
Switching scene 1: {0.50,039,0.51,0.98,0.92,0.51 };
switching scene 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 the above switching scenarios represent the neighboring cell admission delays of different neighboring cells, respectively. For example, in handover scenario 1, 0.50,039,0.51,0.98,0.92, and 0.51 represent neighbor admission delays for neighboring cells gNB 1-gNB 6, respectively.
Further, correspondingly, seven switching scenes are obtained, namely HysAVHAThe value taking condition of (1):
{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, the candidate neighbor sets capable of satisfying the a3 event under different handover scenarios are { gNB }2,gNB6}，{gNB1,gNB2,gNB3,gNB6}，{gNB2}，{gNB3}，{gNB1,gNB2,gNB3,gNB4,gNB5,gNB6}，{gNB2,gNB3,gNB4,gNB5And { gNB }1,gNB4,gNB5}；
For each candidate neighbor cell set, according to the level value, the selected target cells are gNB respectively2，gNB3，gNB2，gNB3，gNB1，gNB2，gNB5。
The AVHA algorithm provided herein is compared with the conventional a3 algorithm and the JIHA algorithm by MATLAB simulation experiments as follows:
the data parameters may take the contents of tables 1 to 3, target sampling 7 times. The obtained relationship between the AVHA hysteresis and the moving speed, the hysteresis in the low-speed state, the target cell, the average of the candidate cell levels, and the candidate cell load conditions under the ultra-threshold moving speed of 80km/h are shown in fig. 2 to fig. 6, respectively.
Fig. 2 shows the relationship between the movement delay and the movement speed of the terminal. As can be seen from fig. 2, when the speed threshold is not exceeded, the motion hysteresis of the AVHA algorithm is the same as that of the conventional a3 algorithm and remains unchanged. When the terminal speed exceeds the speed threshold, the motion delay of the AVHA algorithm is adaptively reduced due to frequency offset to prevent the terminal from dropping due to the drop of the signal level value.
Fig. 3 shows the hysteresis change of the three algorithms in the low speed state. As can be seen from fig. 3, the delay of the AVHA algorithm is unchanged from that of the conventional a3 algorithm, and the JIHA algorithm is always dynamically adjusting the handover delay due to the concern about the cell handover failure rate.
Figure 4 shows the target neighborhood of the three algorithms in the case of 80 km/h. As can be seen from fig. 4, at the last 4 samples, the JIHA algorithm causes no neighbor handover due to the evaluation of the handover failure rate, which indicates that the JIHA algorithm is not well suited for the medium-high speed situation, while the conventional a3 algorithm has similar problems at the 2 nd, 3 rd and 4 th samples, mainly because the handover delay is not sensitive to the terminal moving speed.
Figure 5 shows the mean values of the levels of the neighbours of the three algorithms for the 80km/h case. In medium and high speed mobile handover, the level value is the first factor to consider, as it determines whether the handover can be successful, and then considers the problem of the neighbor cell load. The main difference is that the 3 rd sampling fails to switch the traditional A3 algorithm, and the JIHA algorithm selects the gNB6AVHA Algorithm selection of gNB3. As can be seen from tables 1 and 2, the neighbor gNB3Level value of-111 dBm higher than gNB6Of-116 dBm, and gNB3Load of 0.42 to gNB6Is lower than 0.76, so the AVHA algorithm is relatively more reasonable.
Figure 6 shows the neighborhood load for the three algorithms in the case of 80 km/h. The three algorithms are represented by the maximum time difference in the 4 th sampling, and the JIHA algorithm selects the gNB2AVHA Algorithm selection of gNB4Neighbor gNB4Level value of-94 dBm higher than gNB2Of-95 dBm, but gNB4Load of 0.69 slightly higher than gNB20.42, the JIHA algorithm selects gNB2The result of (2) may be a failure to switch consecutive samples.
The present application also provides a handover apparatus for a 5G cell, which may be referred to in correspondence with the above-described method. Referring to fig. 7, fig. 7 is a schematic diagram of a handover apparatus of a 5G cell according to an embodiment of the present application, and referring to fig. 7, the apparatus includes:
a first determining module 10, configured to determine a movement delay of a terminal according to a movement speed of the terminal;
a second determining module 20, configured to determine, according to a target parameter of a neighboring cell of a serving cell where the terminal is currently located, an admission delay of the neighboring cell;
a screening module 30, configured to screen candidate cells from each neighboring cell according to the mobility delay of the terminal and the neighboring cell admission delay of the neighboring cell;
a selecting 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;
a switching module 50, configured to switch the terminal to the target cell.
On the basis of the foregoing embodiment, as a specific implementation manner, the first determining module 10 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 is greater than or equal to a speed matching threshold, calculate a terminal moving speed exceeding limit according to the moving speed of the terminal, the maximum moving speed supported by the system, and the speed matching threshold, and calculate a moving delay of the terminal according to the terminal moving speed exceeding limit, a speed sensitivity factor, and a handover delay parameter;
a second determining unit, configured to determine that a movement hysteresis of the terminal is equal to the handover hysteresis parameter if the movement speed of the terminal is less than the speed matching threshold.
On the basis of the foregoing embodiments, as a specific implementation manner, the target parameters include resource utilization and a capacity threshold.
On the basis of the foregoing embodiment, as a specific implementation manner, the second determining module 20 includes:
a load reference value calculation unit, configured to calculate a load reference value of the neighboring cell according to the resource utilization rate of the neighboring cell;
a load comparison value calculating unit, configured to calculate a load comparison value of the neighboring cell according to the resource utilization rate of the neighboring cell and a capacity threshold;
the intermediate value calculating unit is used for calculating an intermediate value according to the load comparison value of the adjacent cell;
a high-load hysteresis parameter calculating unit, configured to calculate a high-load hysteresis parameter of the neighboring cell according to the load reference value, the load comparison value, and the intermediate value;
a low-load hysteresis parameter calculating unit, configured to calculate a low-load hysteresis parameter of the neighboring cell according to the load comparison value and the intermediate value;
and the neighbor cell admission delay calculating unit is used for 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.
On the basis of the foregoing embodiment, as a specific implementation manner, the screening module 30 includes:
a calculation obtaining unit, configured to calculate an event delay in the a3 event according to the mobility delay of the terminal and the neighbor admission delay;
the judging unit is used for judging whether the A3 event is established or not after the event lag is substituted into the A3 event;
a determining unit, configured to take the neighboring cell as the candidate cell if the a3 event is true.
The switching device of 5G district that this application provided analyzes the travelling speed of terminal, and the travelling speed of matching terminal that can be better realizes switching delayed automatic adjustment. Meanwhile, access control is carried out on the adjacent cells, the access mechanism of the adjacent cells is fully utilized, the aim 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 in fig. 8.
A memory 1 for storing a computer program;
a processor 2 for executing a computer program to implement the steps of:
determining the movement delay of the terminal according to the movement speed of the terminal; determining neighbor cell admission delay of a neighbor cell according to target parameters of the neighbor cell of a serving cell in which the terminal is currently located; screening candidate cells from each adjacent cell according to the mobility delay of the terminal and the adjacent cell admission delay of the adjacent cell; comparing the signal level values of the candidate cells, 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 introduction of the device provided in the present application, please refer to the above method embodiment, which is not described herein again.
The present application further 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 delay of the terminal according to the movement speed of the terminal; determining neighbor cell admission delay of a neighbor cell according to target parameters of the neighbor cell of a serving cell in which the terminal is currently located; screening candidate cells from each adjacent cell according to the mobility delay of the terminal and the adjacent cell admission delay of the adjacent cell; comparing the signal level values of the candidate cells, 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: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
For the introduction of the computer-readable storage medium provided in the present application, please refer to the above method embodiments, which are not described herein again.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device, the apparatus and the computer-readable storage medium disclosed by the embodiments correspond to the method disclosed by the embodiments, so that the description is simple, and the relevant points can be referred to the description of the method.
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 components and steps have been described above generally in terms of their functionality in order to clearly illustrate this 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 implementation. 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. A software module may reside 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 solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims (10)

1. A method for handover of a 5G cell, comprising:
determining the movement delay of the terminal according to the movement speed of the terminal;
determining neighbor cell admission delay of a neighbor cell according to target parameters of the neighbor cell of a serving cell in which the terminal is currently located;
screening candidate cells from each adjacent cell according to the mobility delay of the terminal and the adjacent cell admission delay of the adjacent cell;
comparing the signal level values of the candidate cells, and selecting the candidate cell with the largest signal level value as a target cell;
and switching the terminal to the target cell.
2. The method of claim 1, wherein the determining the motion delay of the terminal according to the moving speed of the terminal comprises:
if the moving speed of the terminal is less than the maximum moving speed supported by a system and is greater than or equal to a speed matching threshold, calculating to obtain a terminal moving speed over-limit value 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 the moving delay of the terminal according to the terminal moving speed over-limit value, a speed sensitive factor and a switching delay parameter;
if the moving speed of the terminal is less than the speed matching threshold, the moving delay of the terminal is equal to the switching delay parameter.
3. The method of claim 1, wherein the target parameters include resource utilization and capacity threshold.
4. The method of switching the 5G cell according to claim 3, wherein the determining the admission delay of the neighboring cell according to the target parameter of the neighboring cell of the serving cell where the terminal is currently located comprises:
calculating to obtain a load reference value of the adjacent cell according to the resource utilization rate of the adjacent cell;
calculating to obtain 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 a middle 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 a low-load hysteresis parameter of the adjacent cell 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.
5. The method of claim 1, wherein the screening candidate cells from each of the neighboring cells according to the mobility hysteresis of the terminal and the neighboring cell admission hysteresis of the neighboring cells comprises:
calculating to obtain an event delay in the A3 event according to the movement delay of the terminal and the neighbor cell admission delay;
after substituting the event lag into the A3 event, judging whether the A3 event is established;
and if the A3 event is satisfied, taking the adjacent cell as the candidate cell.
6. A handover apparatus for a 5G cell, comprising:
the first determining module is used for determining the movement delay of the terminal according to the movement speed of the terminal;
a second determining module, configured to determine, according to a target parameter of a neighboring cell of a serving cell in which the terminal is currently located, a neighboring cell admission delay of the neighboring cell;
a screening module, configured to screen candidate cells from each neighboring cell according to the mobility delay of the terminal and the neighboring cell admission delay of the neighboring cell;
a selecting module, 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 is used for switching the terminal to the target cell.
7. The apparatus of claim 6, wherein the first determining module comprises:
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 is greater than or equal to a speed matching threshold, calculate a terminal moving speed exceeding limit according to the moving speed of the terminal, the maximum moving speed supported by the system, and the speed matching threshold, and calculate a moving delay of the terminal according to the terminal moving speed exceeding limit, a speed sensitivity factor, and a handover delay parameter;
a second determining unit, configured to determine that a movement hysteresis of the terminal is equal to the handover hysteresis parameter if the movement speed of the terminal is less than the speed matching threshold.
8. The apparatus of claim 6, wherein the second determining module comprises:
a load reference value calculation unit, configured to calculate a load reference value of the neighboring cell according to the resource utilization rate of the neighboring cell;
a load comparison value calculating unit, configured to calculate a load comparison value of the neighboring cell according to the resource utilization rate of the neighboring cell and a capacity threshold;
the intermediate value calculating unit is used for calculating an intermediate value according to the load comparison value of the adjacent cell;
a high-load hysteresis parameter calculating unit, configured to calculate a high-load hysteresis parameter of the neighboring cell according to the load reference value, the load comparison value, and the intermediate value;
a low-load hysteresis parameter calculating unit, configured to calculate a low-load hysteresis parameter of the neighboring cell according to the load comparison value and the intermediate value;
and the neighbor cell admission delay calculating unit is used for 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.
9. A handover apparatus for a 5G cell, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the handover method of a 5G cell according to any of claims 1 to 5 when executing the computer program.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the handover method of a 5G cell according to any one of claims 1 to 5.
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