CN114828114A - Satellite and mobile cellular network switching judgment method - Google Patents
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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
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
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- H—ELECTRICITY
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
- H04B17/327—Received signal code power [RSCP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
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- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
Abstract
The invention discloses a method for judging the switching between a satellite and a mobile cellular network, which comprises the following steps: step 1, measuring the receiving power of the downlink reference signal of the satellite network cell, namely the signal strength RSRP S And mobile cellular network cell downlink reference signal received power, signal strength, RSRP M And respectively calculating to obtain equivalent value RSRP S‑d And RSRP M‑d (ii) a Step 2, calculating the offset OF OF the terminal switched from the mobile cellular network to the satellite network M‑S And offset OF OF the terminal for handover from the satellite network to the mobile cellular network S‑M (ii) a Step 3, calculating the switching lag time T of the terminal from the satellite network cell to the mobile cellular network cell S‑M And a handover delay time T for the terminal to switch from the mobile cellular network cell to the satellite network cell M‑S (ii) a Step 4, the terminal judges the switching between the satellite and the mobile cellular network and executes the network switching operation; and 5, after waiting for the time T, re-executing the step 1.
Description
Technical Field
The invention relates to a network switching judgment method, in particular to a satellite and mobile cellular network switching judgment method.
Background
With the large-scale construction of 5G commercial networks, the industry has turned the emphasis of technical research to 6G. Currently, 6G-related standards have not yet been established, but the introduction of 6G global research has already been developed. The 3GPP is expected to start the study for 6G in 2023 and the substantial 6G international standardization is expected to start in 2025. The 6G network which is commercially available after 2030 is expected to realize truly global seamless coverage.
For the realization of global seamless coverage, a heaven-earth integrated network architecture is necessarily constructed based on a mobile cellular network and by combining a plurality of communication modes such as satellite communication and the like.
Under the heaven-earth integrated network architecture, due to the movement of the terminal, the terminal is necessarily switched between the terrestrial cellular network and the satellite system. For the switching scheme and switching technology across airspace, further research is needed at present. The current handover process between mobile cellular networks can be divided into three phases: wireless measurement, network decision and system execution.
(1) And a wireless measurement phase. The terminal (mobile station) continuously searches the information of the downlink signal intensity of the local cell and the surrounding base station cells, and the like, and simultaneously the base station continuously measures the uplink signal of the mobile station, and the measurement result is sent to the corresponding network unit, the terminal, the control center and the like under certain preset conditions.
(2) And (5) a network judgment stage. After the network compares the measurement result with the predefined threshold and confirms that the target cell can provide the user service currently being served, the network finally determines whether to start the switching.
(3) The system executes the phase. After the terminal receives the switching confirmation command sent by the network unit, the terminal starts to enter a switching execution stage, enters a specific switching state, starts to receive or send a signal corresponding to the new base station, and completes switching.
Most of the handover algorithms used in current mobile communication networks are designed around the parameter of the signal strength of the downlink. However, under the integrated network architecture, the satellite network has the characteristics of higher frequency band, small network capacity, large time delay and the like compared with the mobile cellular network.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a method for judging the switching between a satellite and a mobile cellular network, aiming at the defects of the prior art.
In order to solve the technical problem, the invention discloses a method for judging the switching between a satellite and a mobile cellular network, which comprises the following steps:
step 1, measuring the receiving power of the downlink reference signal of the satellite network cell, namely the signal strength RSRP S And mobile cellular network cell downlink reference signal received power, signal strength, RSRP M And respectively calculating to obtain equivalent value RSRP S-d And RSRP M-d ；
Step 2, calculating the offset OF OF the terminal switched from the mobile cellular network to the satellite network M-S And offset OF OF the terminal for handover from the satellite network to the mobile cellular network S-M ；
Step 3, calculating the switching lag time T of the terminal from the satellite network cell to the mobile cellular network cell S-M And a handover delay time T for the terminal to switch from the mobile cellular network cell to the satellite network cell M-S ；
Step 4, the terminal judges the switching between the satellite and the mobile cellular network and executes the network switching operation;
and 5, after waiting for the time T, re-executing the step 1.
In the present invention, step 1 comprises:
step 1-1, the satellite communication network and the mobile cellular network multimode terminal carry out N times of measurement in a certain time T, aiming at RSRP S And RSRP M Respectively are RSRP S-i And RSRP M-i Where i ∈ [1, N ]]；
Step 1-2, calculating the signal strength RSRP of the downlink of the satellite network cell in time T S Equivalent value of RSRP S-d ；
Step 1-3, calculating the downlink signal strength RSRP of the mobile cellular network cell in time T M Equivalent value of RSRP M-d 。
In the present invention, step 1-2 comprises:
satellite network cell downlink signal strength RSRP during time T S Has an arithmetic mean of RSRP S-av Namely:
within time T, RSRP S Has a variance of R S The calculation method comprises the following steps:
then the satellite network cell downlink signal strength RSRP is measured during time T S Has an equivalent value of RSRP S-d The calculation method comprises the following steps:
RSRP S-d ＝RSRP S-av -R S (3)
in the present invention, steps 1 to 3 include:
mobile cellular network cell downlink signal strength RSRP during time T M Has an arithmetic mean of RSRP M-av Namely:
within time T, RSRP M Variance R of M The calculation method comprises the following steps:
then the mobile cellular network cell downlink signal strength RSRP during time T M Has an equivalent value of RSRP M-d The calculation method comprises the following steps:
RSRP M-d ＝RSRP M-av +R M (6)
in the invention, the step 2 comprises the following steps:
step 2-1, measuring wireless resource utilization ratio UL of satellite network and mobile cellular network subdistrict S And UL M ；
Step 2-2, calculating the wireless resource utilization ratio UL of the satellite network cell S Equivalent value UL of S-d And mobile cellular network cell radio resource utilization UL M Equivalent value UL of M-d ；
Step 2-3, calculating to obtain satellite and mobile cellular network switching offset OF S-M And OF M-S 。
In the present invention, step 2-1 comprises:
in time T, N times of measurement are carried out, and the ith measurement result aiming at the wireless resource utilization rate of the satellite and the mobile cellular network cell is UL S-i And UL M-i Where i ∈ [1, N ]]。
In the invention, the step 2-2 comprises the following steps:
within time T, the utilization ratio UL of wireless resources of satellite network cells S Has an arithmetic mean of UL S-av The calculation method comprises the following steps:
within time T, UL S Variance of is U S The calculation method comprises the following steps:
then the utilization rate UL of the wireless resource of the satellite network cell is within the time T S Has an equivalent value of UL S-d The calculation method comprises the following steps:
UL S-d ＝UL S-av +U S (9)
within time T, the mobile cellular network cell radio resource utilization UL M Has an arithmetic mean of UL M-av The calculation method comprises the following steps:
within time T, UL M Variance U of M The calculation method comprises the following steps:
then within time T the mobile cellular network cell radio resource utilization UL M Has an equivalent value of UL M-d The calculation method comprises the following steps:
UL M-d ＝UL M-av -U M (12)
in the invention, the step 2-3 comprises the following steps:
equivalent value UL based on radio resource utilization of satellite and mobile cellular network cells S-d And UL M-d Calculating OF M-S And OF S-M The method comprises the following steps:
OF M-S ＝OF+UL S-d (13)
OF S-M ＝OF-UL M-d (14)
OF is a fixed offset for inter-network handover.
In the present invention, step 3 comprises:
cell downlink signal strength RSRP based on satellite and mobile cellular network S And RSRP M Has a variance of R S And R M Calculating the switching delay time T of the terminal from the satellite network cell to the mobile cellular network cell S-M And a handover delay time T of the terminal from the mobile cellular network cell to the satellite network cell M-S The method comprises the following steps:
wherein, T Q The latency is fixed for inter-network handover.
In the invention, the step 4 comprises the following steps:
step 4-1, if the terminal resides in the satellite communication network cell, namely the source cell is the satellite communication network cell and the target cell is the mobile cellular network cell, passing T S-M And time, which satisfies the following conditions:
RSRP M-d >RSRP S-d +OF S-M (17)
the terminal performs a handover procedure from the satellite communication network cell to the mobile cellular network cell and performs step 5;
if the condition is not satisfied, directly executing step 5;
step 4-2, if the terminal resides in the mobile cellular network cell, namely the source cell is the mobile cellular network cell and the target cell is the satellite communication network cell, passing T M-S And time, which satisfies the following conditions:
RSRP S-d >RSRP M-d +OF M-S (18)
the terminal performs a handover procedure from the mobile cellular network cell to the satellite communication network cell and performs step 5;
if the condition is not satisfied, step 5 is performed directly.
Has the advantages that:
1. the method provided by the invention considers the utilization rate of the wireless resources of the satellite network and the mobile cellular network. When the wireless utilization rate of the satellite network is far lower than that of the mobile cellular network, the terminal tends to stay in or switch to a satellite network cell; whereas the terminal tends to camp on or handover to the mobile cellular cell. This allows load balancing between the satellite network and the mobile cellular network to be achieved to a certain extent.
2. The method provided by the invention considers the characteristics of a satellite network (large coverage area, small capacity and large time delay) and a mobile cellular network (small coverage area, large capacity and small time delay), so that the method is applied to the judgment of the switching threshold after preprocessing the utilization rate of the wireless resources of the satellite network and the mobile cellular network. Therefore, the utilization rate of wireless resources can be balanced, the terminal is beneficial to being switched into a mobile cellular network, and the transmission rate and the time delay performance of services can be improved.
3. The method provided by the invention considers the parameter of the stability of the network downlink signal intensity on the basis of the fixed delay time when designing the switching delay time, thereby ensuring the determination of the switching decision threshold and reflecting the actual quality of the network better, and reducing the probability of ping-pong switching to the maximum extent.
Drawings
The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
Switching operation is carried out between the satellite and the mobile cellular network cell, and the downlink signal intensity and the preset offset of the target cell and the source cell are mainly considered when wireless measurement and network judgment are carried out. When the sum of the downlink signal strength of the destination cell and the preset offset is larger than the sum of the downlink signal strength of the source cell and the preset offset and lasts for a certain time (lag time), the terminal (mobile station) is switched from the source cell to the destination cell. Here, the preset offset of the target cell and the source cell is related to the wireless utilization rate of the cell, and when the wireless utilization rate of the cell is higher, a smaller preset offset is adopted; when the wireless utilization rate of the cell is low, a large preset offset is adopted, so that the terminal can be switched from the cell with the high wireless utilization rate to the cell with the low wireless utilization rate, and the wireless utilization rates of different cells are balanced. In addition, the switching delay time is set for reducing the probability of ping-pong handover between cells, but since the switching delay time is generally a fixed value and is not dynamically adjusted according to the network quality (signal stability), the switching delay time needs to be associated with the network quality (signal stability), and when the network quality is good, the switching delay time is set to be smaller so that the terminal can complete the handover quickly; when the network quality is relatively poor, a larger switching delay time is set so as to reduce the probability of ping-pong switching.
In a system in which a satellite and a mobile cellular network coexist under a heaven-earth-integrated communication network, the reference signal received power (herein, referred to as signal strength) of a cell downlink in the satellite communication network is assumed to be RSRP S The reference signal received power (herein abbreviated as signal strength) of the cell downlink in the mobile cellular network is RSRP M (ii) a Preset offset OF terminal (mobile station) handover from mobile cellular network to satellite network OF M-S The predetermined offset OF the handover OF the terminal (mobile station) from the satellite network to the mobile cellular network is OF S-M The delay time of the terminal (mobile station) from the satellite network cell to the mobile cellular network cell is T S-M The delay time of the handover of the terminal (mobile station) from the mobile cellular network cell to the satellite network cell is T M-S The terminal (mobile station) completes the handover from the source cell to the destination cell according to the following steps. As shown in fig. 1:
step 1: satellite network and mobile cellular network cell downlink Reference Signal Received Power (RSRP) S And RSRP M And (6) measuring.
The satellite communication network and the mobile cellular network multimode terminal carry out N times of measurement within a certain time TTo RSRP S And RSRP M The ith measurement result of (a) is: RSRP S-i And RSRP M-i Where i ∈ [1, N ]]。
Satellite network cell downlink signal strength RSRP during time T S Has an arithmetic mean of RSRP S-av Namely:
R S within time T, RSRP S The variance of (c) can be calculated by the following formula.
Then the satellite network cell downlink signal strength RSRP is measured during time T S Has an equivalent value of RSRP S-d I.e. by
RSRP S-d ＝RSRP S-av -R S (3)
Mobile cellular network cell downlink signal strength RSRP during time T M Has an arithmetic mean of RSRP M-av Namely:
R M within time T, RSRP M The variance of (c) can be calculated by the following formula.
Then the mobile cellular network cell downlink signal strength RSRP during time T M Has an equivalent value of RSRP M-d Namely:
RSRP M-d ＝RSRP M-av +R M (6)
step 2: satellite network and mobile cellular network cell switching offset OF S-M And OF M-S And (4) calculating.
Step 2.1: wireless resource utilization UL for satellite network and mobile cellular network cells S And UL M And (4) calculating.
N times of measurement are carried out within a certain time T, and the ith measurement result aiming at the wireless resource utilization rate of the satellite and the mobile cellular network cell is respectively UL S-i And UL M-i Where i ∈ [1, N ]]。
Within time T, the utilization ratio UL of wireless resources of satellite network cells S Has an arithmetic mean of UL S-av Namely:
U S is within time T, UL S The variance of (c) can be calculated by the following formula.
Then the utilization rate UL of the wireless resource of the satellite network cell is within the time T S Has an equivalent value of UL S-d I.e. by
UL S-d ＝UL S-av +U S (9)
Within time T, the mobile cellular network cell radio resource utilization UL M Has an arithmetic mean of UL M-av Namely:
U M is within time T, UL M The variance of (c) can be calculated by the following formula.
Then within time T the mobile cellular network cell radio resource utilization UL M Has an equivalent value of UL M-d I.e. by
UL M-d ＝UL M-av -U M (12)
Step 2.2: satellite and mobile cellular network handover offset OF S-M And OF M-S And (4) calculating.
Equivalent value UL based on radio resource utilization of satellite and mobile cellular network cells S-d And UL M-d OF is calculated according to the following formula M-S And OF S-M 。
OF M-S ＝OF+UL S-d (13)
OF S-M ＝OF-UL M-d (14)
The OF is a fixed offset for switching between networks, and its value is set by network operation enterprises.
And step 3: handoff hysteresis time T for satellite and mobile cellular network cell handoff S And T M And (4) setting.
Cell downlink signal strength RSRP based on satellite and mobile cellular network S And RSRP M Has a variance of R S And R M Calculating T according to the following formula S-M And T M-S 。
Wherein, T Q The delay time is fixed for switching between networks, and the value is set by network operation enterprises.
And 4, step 4: the terminal (mobile station) performs a handover operation.
Step 4.1: if the terminal (mobile station) resides in a satellite communication network cell, i.e. the source cell isSatellite communication network cell, the destination cell is mobile cellular network cell, if T passes S-M Time, equation (17) is satisfied, i.e.:
RSRP M-d >RSRP S-d +OF S-M (17)
the terminal (mobile station) performs a handover procedure from the satellite communication network cell to the mobile cellular network cell. Step 5 is then performed.
If equation (17) is not satisfied, step 5 is directly performed.
Step 4.2: if the terminal (mobile station) resides in a mobile cellular network cell, i.e. the source cell is the mobile cellular network cell and the destination cell is the satellite communication network cell, if T is passed M-S Time, satisfies equation (18), i.e.:
RSRP S-d >RSRP M-d +OF M-S (18)
the terminal (mobile station) performs a handover procedure from the mobile cellular network cell to the satellite communication network cell. Step 5 is then performed.
If equation (18) is not satisfied, step 5 is performed directly.
And 5: after waiting a period of time T, step 1 is performed.
Example (b):
(1) step 1
Suppose that the satellite communication network and the mobile cellular network multimode terminal perform N (10) measurements for RSRP within a certain time T (30s) S And RSRP M Respectively are RSRP S-i And RSRP M-i Where i ∈ [1,10 ]]And (3) measuring:
RSRP S-1 to RSRP S-10 Sequentially comprises the following steps: -98dBm, -102dBm, -101dBm, -98dBm, -105dBm, -100dBm, -96dBm, -108dBm, -100dBm, -102 dBm.
RSRP M-1 To RSRP M-10 Sequentially comprises the following steps: -103dBm, -87dBm, -100dBm, -103dBm, -95dBm,
-100dBm、-102dBm、-89dBm、-95dBm、-96dBm。
According to the measurement result, the downlink signal of the satellite network cell is transmitted in the time TSignal Strength RSRP S Arithmetic mean value RSRP of S-av Comprises the following steps:
within time T, RSRP S Variance R of S Comprises the following steps:
satellite network cell downlink signal strength RSRP during time T S Equivalent value of RSRP S-d Comprises the following steps:
RSRP S-d ＝RSRP S-av -R S ＝-101-3.35＝-104.35dBm
mobile cellular network cell downlink signal strength RSRP during time T M Arithmetic mean value RSRP of M-av Comprises the following steps:
within time T, RSRP M Variance R of M Comprises the following steps:
mobile cellular network cell downlink signal strength RSRP during time T M Equivalent value of RSRP M-d Comprises the following steps:
RSRP M-d ＝RSRP M-av +R M ＝-97+5.35＝-91.65dBm
(2) step 2
Measuring radio resource utilization UL in satellite network and mobile cellular network cells S And UL M . During the time T (30s), N (10) times of measurement are carried out, and the ith measurement result aiming at the wireless resource utilization rate of the satellite and the mobile cellular network cell is respectively UL S-i And UL M-i Where i ∈ [1,10 ]]. And (3) measuring:
UL S-1 to UL S-10 Sequentially comprises the following steps: 20%, 30%, 25%, 20%, 28%, 33%, 30%, 35%, 32%.
UL M-1 To UL M-10 Sequentially comprises the following steps: 55%, 35%, 39%, 40%, 50%, 62%, 65%, 48%, 35%, 51%.
Within time T (30s), the satellite network cell radio resource utilization UL S Has an arithmetic mean of UL S-av Comprises the following steps:
within time T, UL S Variance U of S Comprises the following steps:
within time T, the utilization ratio UL of wireless resources of satellite network cells S Has an equivalent value of UL S-d Comprises the following steps:
UL S-d ＝UL S-av +U S ＝29％+0.05＝34％
within time T, the mobile cellular network cell radio resource utilization UL M Is the arithmetic mean value UL of M-av Comprises the following steps:
within time T (30s), UL M Variance U of M Comprises the following steps:
within time T, the mobile cellular network cell radio resource utilization UL M Equivalent value UL of M-d Comprises the following steps:
UL M-d ＝UL M-av -U M ＝48％-0.1＝38％
equivalent value UL based on radio resource utilization of satellite and mobile cellular network cells S-d And UL M-d Calculating OF M-S And OF S-M . Assuming a network handover fixed offset OF 3dB, then:
OF M-s ＝OF+UL S-d ＝3+0.34＝3.34dB
OF S-M ＝OF-UL M-d ＝3-0.48＝2.52dB
(3) step 3
Cell downlink signal strength RSRP based on satellite and mobile cellular network S And RSRP M Has a variance of R S And R M Calculating the switching delay time T of the terminal from the satellite network cell to the mobile cellular network cell S-M And a handover delay time T of the terminal from the mobile cellular network cell to the satellite network cell M-S 。T Q The hysteresis time is set to 0.5s for inter-network handover.
(4) Step 4
1) If the terminal resides in the satellite communication network cell, namely the source cell is the satellite communication network cell and the target cell is the mobile cellular network cell, the terminal passes through T S-M (0.81s) time:
RSRP M-d ＝-91.65dBm
RSRP S-d +OF S-M ＝-104.35+2.52＝-101.83dBm
satisfying RSRP M-d >RSRP S-d +OF S-M The terminal thus performs a handover procedure from the satellite communication network cell to the mobile cellular network cell and then performs step 5;
2) if it is finishedThe terminal resides in a mobile cellular network cell, namely the source cell is the mobile cellular network cell, the target cell is the satellite communication network cell, and the terminal passes through T M-S (0.69s) time:
RSRP S-d ＝-104.35dBm
RSRP M-d +OF M-S ＝-91.65+3.34＝-88.31dBm
unsatisfied RSRP S-d >RSRP M-d +OF M-S This condition, and therefore the terminal still camped on the mobile cellular network cell, then directly performs step 5.
The present invention provides a method and a system for determining a handover between a satellite and a mobile cellular network, and a plurality of methods and ways for implementing the technical solution, where the foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and modifications may be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. All the components not specified in this embodiment can be implemented by the prior art.
Claims (10)
1. A method for judging the switching between a satellite and a mobile cellular network is characterized by comprising the following steps:
step 1, measuring the receiving power of the downlink reference signal of the satellite network cell, namely the signal strength RSRP S And mobile cellular network cell downlink reference signal received power, signal strength, RSRP M And respectively calculating to obtain equivalent value RSRP S-d And RSRP M-d ；
Step 2, calculating the offset OF OF the terminal switched from the mobile cellular network to the satellite network M-S And offset OF OF the terminal for handover from the satellite network to the mobile cellular network S-M ；
Step 3, calculating the switching lag time T of the terminal from the satellite network cell to the mobile cellular network cell S-M And a handover delay time T for the terminal to switch from the mobile cellular network cell to the satellite network cell M-S ；
Step 4, the terminal judges the switching between the satellite and the mobile cellular network and executes the network switching operation;
and 5, after waiting for the time T, re-executing the step 1.
2. The method for deciding on handoff between a satellite and a mobile cellular network as claimed in claim 1, wherein step 1 comprises:
step 1-1, the satellite communication network and the mobile cellular network multimode terminal carry out N times of measurement in a certain time T, aiming at RSRP S And RSRP M Respectively are RSRP S-i And RSRP M-i Where i ∈ [1, N ]]；
Step 1-2, calculating the satellite network cell downlink signal strength RSRP in time T S Equivalent value of RSRP S-d ；
Step 1-3, calculating the downlink signal strength RSRP of the mobile cellular network cell in time T M Equivalent value of RSRP M-d 。
3. The method for deciding on handoff between a satellite and a mobile cellular network as claimed in claim 2, wherein step 1-2 comprises:
satellite network cell downlink signal strength RSRP during time T S Has an arithmetic mean of RSRP S-av Namely:
within time T, RSRP S Has a variance of R S The calculation method comprises the following steps:
then the satellite network cell downlink signal strength RSRP is measured during time T S Has an equivalent value of RSRP S-d The calculation method comprises the following steps:
RSRP S-d ＝RSRP S-av -R S (3) 。
4. a method for deciding on handoff between a satellite and a mobile cellular network as claimed in claim 3, wherein the steps 1-3 comprise:
mobile cellular network cell downlink signal strength RSRP during time T M Has an arithmetic mean of RSRP M-av Namely:
within time T, RSRP M Variance R of M The calculation method comprises the following steps:
then the mobile cellular network cell downlink signal strength RSRP during time T M Has an equivalent value of RSRP M-d The calculation method comprises the following steps:
RSRP M-d ＝RSRP M-av+RM (6) 。
5. the method for determining handoff between a satellite and a mobile cellular network as claimed in claim 4, wherein step 2 comprises:
step 2-1, measuring wireless resource utilization ratio UL of satellite network and mobile cellular network subdistrict S And UL M ；
Step 2-2, calculating the wireless resource utilization ratio UL of the satellite network cell S Equivalent value UL of S-d And mobile cellular network cell radio resource utilization UL M Equivalent value UL of M-d ；
Step 2-3, calculating to obtain satellite and mobile cellular network switching offset OF S-M And OF M-S 。
6. The method for deciding on handoff between a satellite and a mobile cellular network as claimed in claim 5, wherein step 2-1 comprises:
in time T, N times of measurement are carried out, and the ith measurement result aiming at the wireless resource utilization rate of the satellite and the mobile cellular network cell is UL S-i And UL M-i Where i ∈ [1, N ]]。
7. The method for determining handoff between a satellite and a mobile cellular network according to claim 6, wherein step 2-2 comprises:
within time T, the utilization ratio UL of wireless resources of satellite network cells S Has an arithmetic mean of UL S-av The calculation method comprises the following steps:
within time T, UL S Variance of is U S The calculation method comprises the following steps:
then the utilization rate UL of the wireless resource of the satellite network cell is within the time T S Has an equivalent value of UL S-d The calculation method comprises the following steps:
UL S-d ＝UL S-av +U S (9)
within time T, the mobile cellular network cell radio resource utilization UL M Has an arithmetic mean of UL M-av The calculation method comprises the following steps:
within time T, UL M Variance U of M The calculation method comprises the following steps:
then within time T the mobile cellular network cell radio resource utilization UL M Has an equivalent value of UL M-d The calculation method comprises the following steps:
UL M-d ＝UL M-av -U M (12) 。
8. the method for determining handoff between a satellite and a mobile cellular network according to claim 7, wherein step 2-3 comprises:
equivalent value UL based on radio resource utilization of satellite and mobile cellular network cells S-d And UL M-d Calculating OF M-S And OF S-M The method comprises the following steps:
OF M-S ＝OF+UL S-d (13)
OF S-M ＝OF-UL M-d (14)
OF is a fixed offset for inter-network handover.
9. The method for determining handoff between a satellite and a mobile cellular network as claimed in claim 8, wherein step 3 comprises:
cell downlink signal strength RSRP based on satellite and mobile cellular network S And RSRP M Has a variance of R S And R M Calculating the switching delay time T of the terminal from the satellite network cell to the mobile cellular network cell S-M And a handover delay time T of the terminal from the mobile cellular network cell to the satellite network cell M-S The method comprises the following steps:
wherein, T Q The latency is fixed for inter-network handover.
10. The method for determining handoff between a satellite and a mobile cellular network as claimed in claim 9, wherein step 4 comprises:
step 4-1, if the terminal resides in the satellite communication network cell, namely the source cell is the satellite communication network cell and the target cell is the mobile cellular network cell, passing T S-M And time, which satisfies the following conditions:
RSRP M-d ＞RSRP S-d +OF S-M (17)
the terminal performs a handover procedure from the satellite communication network cell to the mobile cellular network cell and performs step 5;
if the condition is not satisfied, directly executing step 5;
step 4-2, if the terminal resides in the mobile cellular network cell, namely the source cell is the mobile cellular network cell and the target cell is the satellite communication network cell, passing T M-S And time, which satisfies the following conditions:
RSRP S-d ＞RSRP M-d +OF M-S (18)
the terminal performs a handover procedure from the mobile cellular network cell to the satellite communication network cell and performs step 5;
if the condition is not satisfied, step 5 is performed directly.
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