CN112367687A - Service type-based 4G and 5G multimode terminal network selection method - Google Patents

Abstract

The invention discloses a method for selecting a 4G and 5G multimode terminal network based on service types, which comprises the step of calculating the utilization rate U of wireless resources of a 4G and 5G current network_4GAnd U_5G(ii) a Calculating the network wireless resource utilization rate U after pre-allocating B wireless resources in the 4G and 5G networks_4G‑BAnd U_5G‑B(ii) a Calculating normalized equivalent value FA of influencing network selection factor m of 4G and 5G networks_4G‑mAnd FA_5G‑m(ii) a Calculating network selection preference factors S for 4G and 5G networks_4G‑iAnd S_5G‑i(ii) a Calculating network resource matching factor F of 4G and 5G networks_4GAnd F_5G(ii) a Calculating 4G/5G multimode terminal network bearing selection factor F, selecting according to the calculation resultA network. The invention can fully consider the resource utilization rate of the existing network when selecting the network bearing of the 4G and 5G multimode terminal, and simultaneously combines the performance of the network and the bearing capacity of different services to realize the network bearing selection based on the service characteristics.

Description

Service type-based 4G and 5G multimode terminal network selection method

Technical Field

The invention relates to the technical field of mobile communication, in particular to a method for selecting a 4G and 5G multimode terminal network based on service types.

Background

In the past forty years, mobile communication has undergone a leap-type development from voice service to mobile broadband data service, which not only deeply changes people's life style, but also greatly promotes the rapid development of society and economy.

From the development of the first generation of analog cellular mobile communication systems to date, mobile communications have undergone five generations of evolution. Operators are about to enter 2G and 3G network quit at present, and 4G and 5G coexist for a long time.

4G and 5G coexist for a long time, and the problem of multi-mode terminal network bearing selection necessarily exists. The current strategy is to select a 5G network first, and simultaneously, according to the signal level situation, in an area with poor signal level of the 5G network, a terminal is switched or reselected to a 4G network from the 5G network, so that dynamic network selection based on the signal level is realized.

For 4G and 5G multimode terminals, when network selection is carried out, the main strategy is to prefer a 5G network, when a 5G network signal is poor, the 4G network is selected, and when the 5G network signal becomes good, the multimode terminal can reselect the 5G network. It can be said that the main consideration of the multimode terminal in network selection is the network coverage factor, i.e. the radio signal factor. However, the actual network operation has different load conditions, and different wireless resources can be provided for services; in addition, because the carrying capacities of the networks for different services are different, and the supporting capacities for the services are also different, for example, the carrying capacity of the 5G network for the urrllc (ultra-Reliable and Low Latency Communication) service is much stronger than that of the 4G network, so that when network selection is performed, only the coverage condition of the network is considered, and it is difficult to realize the optimal carrying for the service, therefore, when a multi-mode terminal performs network selection, the load condition of the network itself needs to be considered, and the carrying capacities of the network for different services also need to be considered, so as to realize the network carrying selection based on the service type.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to solve the technical problem of providing a method for selecting a 4G and 5G multimode terminal network based on service types aiming at the defects of the prior art.

In order to solve the technical problem, the invention discloses a method for selecting a 4G and 5G multimode terminal network based on service types, which comprises the following steps:

step 1: calculating the utilization rate U of the wireless resources of the 4G and 5G existing networks_4GAnd U_5GThe upper limit of the wireless resource utilization rate is set to be H; if U is_4GNot less than H and U_5GIf not, executing the step 8, otherwise, executing the step 2;

step 2: calculating the network wireless resource utilization rate U after pre-allocating B wireless resources in the 4G and 5G networks_4G-BAnd U_5G-B(ii) a If U is_4G-BNot less than H and U_5G-BIf the H is more than or equal to H, executing the step 8; if U is_4G-B< H and U_5G-B< H, performing step 3; otherwise, executing step 7;

and step 3: calculating normalized equivalent value FA of influencing network selection factor m of 4G and 5G networks_4G-mAnd FA_5G-m；

And 4, step 4: calculating network selection preference factors S for 4G and 5G networks_4G-iAnd S_5G-i；

And 5: calculating network resource matching factor F of 4G and 5G networks_4GAnd F_5G；

Step 6: calculating a 4G/5G multimode terminal network bearing selection factor F, selecting a network according to a calculation result, and then executing the step 9;

and 7: if U is_4G-BNot less than H and U_5G-BIf the number is less than H, the multimode terminal selects a 5G network to bear the service, and step 9 is executed; if U is_5G-BNot less than H and U_4G-BIf the number is less than H, the multimode terminal selects a 4G network to bear the service, and step 9 is executed;

and 8: rejecting the service bearing wireless resource allocation request of the 4G/5G multimode terminal, and executing the step 9;

and step 9: and waiting for the 4G/5G multimode terminal to initiate a new network radio resource bearing request, and then executing the step 1.

In one implementation manner, in the step 1, the utilization ratio U of the wireless resources of the 4G current network is_4GThe calculation formula of (a) is as follows:

U_4G＝B_4G-U/B_4G

5G current network wireless resource utilization rate U_5GThe calculation formula of (a) is as follows:

U_5G＝B_5G-_U/B_5G

wherein, B_4G-UFor occupied radio resources in the existing network of 4G networks, B_4GTotal wireless resources for the 4G network; b is_5G-UFor occupied radio resources in the current network of the 5G network, B_5GIs the total wireless resource of the 5G network.

In one implementation manner, in the step 2, the 4G network pre-allocates B radio resources to obtain the network radio resource utilization U_4G-BThe calculation formula of (a) is as follows:

U_4G-B＝(B+B_4G-U)/B_4G

network wireless resource utilization rate U after pre-allocating B wireless resources for 5G network_5G-BThe calculation formula of (a) is as follows:

U_5G-B＝(B+B_5G-U)/B_5G

in an implementation manner, in the step 3, the normalization processing is performed on the factor affecting network selection within a period of time T, and a normalized equivalent value of the factor affecting network selection m is denoted as FA_m，m∈[1，N]N is the total number of factors affecting network selection; the factors influencing network selection are divided into two types, wherein the larger the numerical value is, the better the network performance is; the other is that the smaller the value, the better the network performance;

for a 4G network:

the larger the numerical value is, the better the network performance is, and the types of factors influencing network selection are subjected to normalized equivalent calculation by adopting the following formula:

FA_4G-m＝(FA_4G-m-a-σ_4G-m)/FA_the-m

the smaller the numerical value is, the better the network performance is, and the types of factors influencing network selection are used for carrying out normalized equivalent calculation:

FA_4G-m＝FA_the-m/(FA_4G-m-av+σ_4c-m)

wherein, FA_the-mFor optimal values in 4G and 5G systems affecting network selection factor m, for the same affecting network selection factor m, FA_the-mTaking the optimal values in the 4G system and the 5G system; FA_4G-m-avTo calculate the arithmetic mean of the values of the network selection influencing factors m over a period of time T, the following formula is used:

σ_4G-min order to influence the variance of the network selection factor m in T in the same period of time, the following formula is adopted for calculation:

for a 5G network:

the larger the numerical value is, the better the network performance is, and the types of factors influencing network selection are subjected to normalized equivalent calculation by adopting the following formula:

FA_5G-m＝(FA_5G-m-a-σ_5G-m)/FA_the-m

the smaller the numerical value is, the better the network performance is, and the types of factors influencing network selection are used for carrying out normalized equivalent calculation:

FA_5G-m＝FA_the-m/(FA_5G-m-av+σ_5G-m)

wherein, FA_5G-m-avTo calculate the arithmetic mean of the values of the network selection influencing factors m over a period of time T, the following formula is used:

σ_5G-min order to influence the variance of the network selection factor m in the same period of time T, the following formula is adopted for calculation:

in one implementation manner, in the step 4, the network selection preference factor of the service type i for the 4G network is recorded as S_4G-iThe network selection preference factor of the service type i for the 5G network is recorded as S_5G-i(ii) a For 4G and 5G networks, the influence of the factor m influencing network selection when the service type is i in the network bearing selection is defined as an influence factor, and CO is used_i-mIs represented by where m ∈ [1, N ]]；CO_i-mThe value of (A) is calculated by the following formula:

CO_i-m＝abs((FA_4G-m-FA_5G-m)/(FA_4G-m+FA_5G-m))

wherein: abs () is an absolute value dereferencing function;

network selection preference factor S for 4G networks_4G-iThe calculation formula of (a) is as follows:

network selection preference factor S for 5G networks_5G-iThe calculation formula of (a) is as follows:

wherein: FA_4G-mAnd FA_5G-mRespectively representing the shadow of 4G and 5G networksNormalized equivalent value of response network selection factor m, m being [1, N ]]；

In one implementation, in said step 5, F is defined_4GIs a 4G network resource matching factor, F_5GFor the 5G network resource matching factor, the calculation formula is as follows:

F_4G＝S_4G-i+(U_4G/U_4G-B)+Δ_4G-i

F_5G＝S_5G-i+(U_5G/U_5G-B)+Δ_5G-i

wherein: delta_4G-iAnd Δ_5G-iThe resource matching factor offset when the service type is i in the 4G and 5G networks, respectively, and the value of the offset is calculated according to the following formula.

Δ_4G-i＝TH_4G-i/T_4G-i

Δ_5G-i＝TH_5G-i/T_5G-i

Wherein: t is_4G-iThe method comprises the steps that a 4G network average time delay within a certain time T is the service with the service type i; TH_4G-iThe method comprises the steps that the average throughput of a 4G network within a certain time T is the service with the service type i; t is_5G-iThe method comprises the steps that a 5G network average time delay within a certain time T is used for a service with a service type i; TH_5G-iThe average throughput of the 5G network within a certain time T is the service with the service type i.

In one implementation manner, in the step 6, the network bearer selection factor F of the 4G/5G multimode terminal is calculated according to the following formula:

F＝max(F_4G，F_5G)

wherein: max () is a function of taking the maximum value when F ═ F_4GIf so, the multi-mode terminal selects the 4G network to carry the service; when F ═ F_5GAnd if so, the multimode terminal selects the 5G network to carry the service.

In one implementation, the factors influencing network selection in steps 3 and 4 include network throughput, network delay and network error rate.

Has the advantages that:

1. the method provided by the invention considers the load conditions of the 4G and 5G networks and preferentially selects the network with lower load. A network with a lower load generally provides more broadband resources and can provide better network performance.

2. The method provided by the invention considers the influence on the utilization rate of the network wireless resources after new wireless resources are distributed when the multi-mode terminal carries out network bearing selection, and the 5G network can provide more idle wireless resources for users under the same wireless utilization rate.

3. The method provided by the invention comprehensively considers the factors influencing network selection, such as the influence of network throughput, network delay and network error rate, of the 4G and 5G networks aiming at different service types, thereby selecting the optimal bearing network.

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 flow chart of an embodiment of the present invention

Detailed Description

Suppose a certain 4G/5G multimode terminal has three types of services, namely eMBB (enhanced Mobile BroadBand, S-used) service_eRepresentative), mtc (massive Machine Type Communication, using S)_mRepresentative) and urrllc service (ultra-Reliable and Low Latency Communication, with S_uRepresentative). At a certain moment, B radio Resources (RBs) need to be applied for carrying a certain type of service. The 4G/5G multimode terminal selects the service bearing network according to the steps shown in figure 1, namely selects the 4G or 5G network to bear the service.

Step 1: and calculating the utilization rate of the wireless resources of the 4G and 5G current networks.

Suppose the utilization rate of wireless resources of the 4G current network is U_4GThe utilization rate of wireless resources of the 5G current network is U_5GAnd then:

U_4G＝B_4G-U/B_4G (1)

U_5G＝B_5G-U/B_5G (2)

wherein, B_4G-UFor the occupied (used) radio resources of the existing network of the 4G network, B_4GTotal wireless resources for the 4G network; b is_5G-UFor occupied (used) radio resources of the existing network of the 5G network, B_5GIs the total wireless resource of the 5G network.

Considering that the stability of the network operation will be affected by the level of the network radio resource utilization, in order to ensure the stable operation of the network, an upper limit of the network radio resource utilization needs to be set, as shown in equations (3) and (4). Wherein H is the upper limit of the utilization rate of the wireless resources for ensuring the stable operation of the network.

U_4G≥H (3)

U_5G≥H (4)

If equations (3) and (4) are satisfied simultaneously, performing step 8; otherwise, executing step 2.

Step 2: and calculating the utilization rate of the network wireless resources after the 4G and 5G networks pre-allocate B wireless resources.

U_4G-B、U_5G-BRespectively showing the radio resource utilization rate of the 4G and 5G networks after B radio resources are pre-allocated. The calculation formulas are shown in (5) and (6).

U_4G-B＝(B+B_4G-U)/B_4G (5)

U_5G-B＝(B+B_5G-U)/B_5G (6)

In order to ensure the stable operation of the network, the U is required to be paired_4G-BAnd U_5G-BThe numerical value of (a) is defined.

U_4G-B≥H (7)

U_5G-B≥H (8)

If equations (7) and (8) are satisfied simultaneously, step 8 is performed.

If only one of equations (7) and (8) is satisfied, step 7 is performed.

If equations (7) and (8) are not satisfied at the same time, step 3 is performed.

And step 3: and calculating the normalized equivalent values of the 4G and 5G networks influencing the network selection factors.

Because the performance requirements of different types of services on the network, such as Throughput (TH), Time Delay (TD), bit error rate (BE), etc., are different, these factors all affect the selection of different types of services on the bearer network. Network performances such as network Throughput (TH), Time Delay (TD), bit error rate (BE), etc. are affected by factors such as network load, interference severity, etc., and are changed in real time. Therefore, the factors influencing the network selection are equivalent and normalized, and are expressed by FA. For computational convenience, it is necessary to discretize the continuous time T to represent the value of FA in a value in a unit time (which may be seconds, minutes, or other units).

FA_mSelecting a normalized equivalent value of a factor m for influencing the network, m being equal to [1, N]And N is the total number of factors affecting network selection.

There are various factors that affect network selection (network performance), and they can be generally classified into two categories: one is that the larger the value, the better the network performance, such as throughput performance; another category is that the smaller the number, the better the network performance, such as latency performance.

For a 4G network:

the normalization equivalent calculation can be performed by using the following formula to calculate the influence factors of the type that the larger the numerical value is, the better the network performance is.

FA_4G-m＝(FA_4G-m-av-σ_4G-m)/FA_the-m (9)

The normalization equivalent calculation can be performed by using the following formula to calculate the influence factors of the type that the smaller the numerical value is, the better the network performance is.

FA_4G-m＝FA_the-m/(FA_4G-m-av+σ_4G-m) (10)

Wherein, FA_the-mThe optimal values in the 4G and 5G systems (the same factor affecting network selection, the optimal values in the 4G and 5G systems) which affect the network selection factor m (network performance) are set by the operator. FA_4G-m-avThe arithmetic mean of the normalized equivalent of the network selection factor m over a period of time (T) can be calculated using the following formula.

σ_4G-mThe variance of the normalized equivalent of the network selection factor m over the same time period (T) can be calculated using the following formula.

For equations (9), (10), (11), (12), if m is the network delay, FA is_4G-mNormalized equivalent value, FA, representing the delay of a 4G network_4G-m-avThe arithmetic mean, σ, representing the network delay over a period of time (T)_4G-mRepresenting the variance of the 4G network delay over the same period of time (T).

For a 5G network:

the normalization equivalent calculation can be performed by using the following formula to calculate the influence factors of the type that the larger the numerical value is, the better the network performance is.

FA_5G-m＝(FA_5G-m-a-σ_5G-m)/FA_the-m (13)

The normalization equivalent calculation can be performed by using the following formula to calculate the influence factors of the type that the smaller the numerical value is, the better the network performance is.

FA_5G-m＝FA_the-m/(FA_5G-m-a+σ_5G-m) (14)

Wherein, FA_5G-m-avThe arithmetic mean of the normalized equivalent of the network selection factor m over a period of time (T) can be calculated using the following formula.

σ_5G-mThe variance of the normalized equivalent of the network selection factor m over the same time period (T) can be calculated using the following formula.

For equations (13), (14), (15), (16), if m is the network delay, FA_5G-mNormalized equivalent value, FA, representing 5G network delay_5G-m-avThe arithmetic mean, σ, representing the network delay over a period of time (T)_5G-mRepresenting the variance of the 5G network delay over the same period of time (T).

And 4, step 4: network selection preference factors for 4G and 5G networks are calculated.

Defining a network selection preference factor, namely:

S_4G-ithe preference factor (i represents the service type) of different types of services for the 4G network, and for eMBB, mMTC and uRLLC services, the preference factor is S_4G-e、S_4G-m、S_4G-u。

S_5G-iThe preference factor (i represents the service type) of different types of services for the 5G network, and for eMBB, mMTC and uRLLC services, the preference factor is S_5G-e、S_5G-m、S_5G-u。

Assuming that there are N network performance factors to be considered when selecting network bearers for different types of services, for 4G and 5G networks, each network selection influencing factor m has different influence (or function) in selecting network bearers, and is defined as an influencing factor, and CO is used_i-mMeaning the impact factor of m kinds of impact network selection factors when the service type is i, wherein m is the element of [1, N ]]). Namely CO_i-₁Selecting an influencing factor, CO, of factor 1 for the network with a service type i_i-2An influence factor, CO, influencing the network selection factor 2 for a service type i_i-NAnd selecting an influence factor N for the network when the service type is i.

With respect to CO_i-mThe value of (b) can be calculated by the following formula:

CO_i-m＝abs((FA_4G-m-FA_5G-m)/(FA_4G-m+FA_5G-m)) (17)

wherein: abs () is an absolute value valued function.

With respect to S_4G-iAnd S_5G-iThe numerical value of (c) can be calculated according to the formulas (18) and (19).

Wherein: FA_4G-mAnd FA_5G-mRespectively representing the normalized equivalent values of various factors influencing network selection, such as Throughput (TH), Time Delay (TD), bit error rate (BE) and the like of 4G and 5G networks, wherein m belongs to [1, N]. When m is 1, the normalized equivalent value of the first kind of influence network selection factor is expressed, and when m is N, the normalized equivalent value of the nth kind of influence network selection factor is expressed. In the actual operation of the network, the operator determines which factors influencing the network selection are specifically adopted. CO 2_i-mNetwork bearing selection influence factor representing service type i, m is in the range of [1, N]When m is 1, the influence factor of the first kind of influence factor on the network selection is indicated, and when m is N, the influence factor of the nth kind of influence factor on the network selection is indicated.

And 5: network resource matching factors for the 4G and 5G networks are calculated.

Definition F_4GIs a 4G network resource matching factor, F_5GThe calculation formula of the matching factor for the 5G network resources is as follows:

F_4G＝S_4G-i+(U_4G/U_4G-B)+Δ_4G-i (20)

F_5G＝S_5G-i+(U_5G/U_5G-B)+Δ_5G-i (21)

wherein: delta_4G-iAnd Δ_5G-iThe resource matching factor offset when the service type is i in the 4G and 5G networks, respectively, and the value of the offset is calculated according to the following formula.

Δ_4G-i＝TH_4G-i/T_4G-i (22)

Δ_5G-i＝TH_5G-i/T_5G-i (23)

Wherein: t is_4G-iThe method comprises the steps that (1) 4G network average time delay within a certain time (T) is carried out on a service with a service type i; TH_4G-iThe average throughput of the 4G network within a certain time (T) is the service with the service type i. T is_5G-iThe method comprises the steps that 5G network average time delay within a certain time (T) is carried out on a service with a service type i; TH_5G-iFor a service with a service type i, the 5G network average throughput is within a certain time (T).

Step 6: and calculating the network bearing selection factors of the 4G multimode terminal and the 5G multimode terminal.

And calculating a 4G/5G multimode terminal network bearing selection factor F according to the following formula.

F＝max(F_4G，F_5G) (24)

Wherein: max () is a function of taking the maximum value when F ═ F_4GIf so, the multi-mode terminal selects the 4G network to carry the service; when F ═ F_5GAnd if so, the multimode terminal selects the 5G network to carry the service. Step 9 is performed.

And 7: if equation (7) is satisfied, i.e. U_4G-BThe multimode terminal selects a 5G network to bear the service, and executes the step 9; if equation (8) is satisfied, i.e. U_5G-BAnd if the service is not less than H, the multimode terminal selects the 4G network to bear the service, and step 9 is executed.

And 8: and rejecting the service bearing wireless resource allocation request of the 4G/5G multimode terminal, and executing the step 9.

And step 9: and waiting for the 4G/5G multimode terminal to initiate a new network radio resource bearing request, and then executing the step 1.

The first embodiment is as follows:

there are three types of services carried by a 4G/5G multimode terminal, namely eMBB service (using S)_eRepresentative), mtc traffic (with S)_mDelegate) and uRLLC service (with S)_uRepresentative). At a certain moment, 10 radio Resources (RBs) need to be applied to carry the eMBB service (S)_eDelegate) services. 4G-The 5G multimode terminal selects the service bearing network according to the following steps, namely selecting the 4G or 5G network to bear the service.

Step 1: and calculating the utilization rate of the wireless resources of the 4G and 5G current networks.

Suppose that the occupied (used) radio Resources (RBs) of the 4G current network are 30, namely B_4G-UTo 30, under 20MHz networking, the total radio Resources (RBs) of 4G are 100, i.e., B_4G100; the occupied (used) radio Resources (RB) of the 5G current network are 50, namely B_5G-UUnder 100MHz networking, the total number of 5G radio Resources (RBs) is 273, i.e.: b is_5G＝273。

Therefore, the utilization rate of the wireless resources of the 4G current network is U_4GComprises the following steps:

U_4G＝B_4G-U/B_4G＝30/100＝30％

the utilization rate of wireless resources of the 5G current network is U_5GComprises the following steps:

U_5G＝B_5G-U/B_5G＝50/273＝18％

considering that the high and low utilization rate of the network wireless resources will affect the stability of the network operation, in order to ensure the stable operation of the network, the upper limit of the utilization rate of the network wireless resources needs to be set, according to the experience of the operator in network operation for many years, generally, the utilization rate of the network wireless resources exceeds 60%, the capacity expansion needs to be considered, and the utilization rate of the network wireless resources exceeds 80%, and the stability of the network operation will be reduced, so the upper limit of the utilization rate of the network wireless resources is set to 80%. Because:

U_4G＝30％＜80％

U_5G＝18％＜80％

step 2 is thus performed.

Step 2: and calculating the utilization rate of the network wireless resources after the 4G and 5G networks pre-allocate the wireless resources.

The radio resource utilization rates after pre-allocating 10 radio Resources (RBs) for 4G and 5G are respectively:

U_4G-B＝(B+B_4G-U)/B_4G＝(10+30)/100＝40％

U_5G-B＝(B+B_5G-U)/B_5G＝(10+50)/273＝22％

due to U_4G-BAnd U_5G-BAre all less than 80%, so step 3 is performed.

And step 3: and calculating the normalized equivalent values of the 4G and 5G networks influencing the network selection factors.

Because the performance requirements of different types of services on the network, such as Throughput (TH), Time Delay (TD), bit error rate (BE), etc., are different, these factors all affect the selection of different types of services on the bearer network. Two factors that affect network selection, network Throughput (TH) and Time Delay (TD), are considered.

Firstly, a certain time (set as 1 hour, namely, T is 1 hour) is selected, and two network performances of network Throughput (TH) and Time Delay (TD) are subjected to normalized equivalent processing.

For network Throughput (TH), it is assumed that 4G and 5G network real-time throughputs are counted in one unit duration of 10 minutes within 1 hour. The real-time throughput of the 4G network is respectively as follows: 50Mbps, 40Mbps, 60Mbps, 80Mbps, 50Mbps, 90 Mbps; the real-time throughput of the 5G network is respectively as follows: 300Mbps, 800Mbps, 900Mbps, 700Mbps, 400Mbps, 700 Mbps. The optimal value for network throughput for 4G and 5G networks is 1000 Mbps.

For the network Time Delay (TD), it is assumed that the 4G and 5G network real-time delays are counted in 1 hour with 10 minutes as a unit duration. The 4G network time delay is respectively as follows: 30ms, 20ms, 25ms, 30ms, 20ms, 30 ms; the 5G network time delay is respectively as follows: 15ms, 18ms, 20ms, 19ms, 16ms, 15 ms. The optimal value of network delay for 4G and 5G networks is 10 ms.

Thus:

4G network: the mean value of the network throughput is 62Mbps, and the variance is 18; the mean value of the network delay is 26ms and the variance is 4.

5G network: the mean value of the network throughput is 633Mbps, and the variance is 213; the mean value of the network delay is 17ms and the variance is 2.

On the basis of the above, the following can be calculated respectively:

the normalized equivalent throughput of the 4G network is 0.04, and the normalized equivalent delay is 0.33.

The normalized equivalent throughput of the 5G network is 0.42, and the normalized equivalent delay is 0.52.

And 4, step 4: network selection impact preference factors for 4G and 5G networks are calculated.

For 4G and 5G networks, each influence factor m has different influence (or effect) in network bearer selection, and is defined as an influence factor, and CO is used_i-mMeaning the impact factor of m kinds of impact network selection factors when the service type is i, wherein m is the element of [1, N ]])。

Here, CO_e-1Representing the network throughput impact factor, CO, of eMBB services_e-2The network delay impact factor of the eMBB service is expressed, and specific values can be calculated by adopting the following formulas:

CO_e-1＝abs((FA_4G-1-FA_5G-1)/(FA_4G-1+FA_5G-1))＝abs((0.04-0.42)/(0.04+0.42))＝0.81

CO_e-2＝abs((FA_4G-2-FA_5G-2)/(FA_4G-2+FA_5G-2))＝abs((0.33-0.52)/(0.33+0.52))＝0.23

then the 4G and 5G networks select the preference factor S_4G-iAnd S_5G-iThe numerical value of (c) can be calculated according to the following formula.

And 5: network resource matching factors for the 4G and 5G networks are calculated.

Suppose an average delay T of the 4G network for eMBB service over a certain time (1 hour)_4G-i17ms, 4G network average throughput TH of eMBB service in a certain time (1 hour)_4G-iIs 40 Mbps; 5G network average time delay T of eMBB service in a certain time (1 hour)_5G-iFor 30ms, eMBB service is in a certain time (1 small)Time) 5G network average throughput TH_5G-iAt 80 Mbps.

Then, the resource matching factor offset Δ when the 4G and 5G network traffic is eMBB_4G-iAnd Δ_5G-iThe calculation was performed according to the following formulas, respectively.

Δ_4G-i＝TH_4G-i/T_4G-i＝40/17＝2.35

Δ_5G-i＝TH_5G-i/T_5G-I＝80/30＝2.67

Definition F_4GIs a 4G resource matching factor, F_5GThe calculation formula of the matching factor for the 5G network resources is as follows:

F_4G＝S_4G-i+(U_4G/U_4G-B)+Δ_4G-i＝0.89+(30％/40％)+2.35＝3.99

F_5G＝S_5G-i+(U_5G/U_5G-B)+Δ_5G-i＝0.81+(18％/22％)+2.67＝4.30

step 6: network bearer selection factors for the 4G and 5G networks are calculated.

And calculating a 4G/5G multimode terminal network bearing selection factor F according to the following formula.

F＝max(F_4G，F_5G)＝max(3.99，4.30)＝4.30

Since F is F_5GTherefore, the 4G/5G multimode terminal selects the 5G network to carry the service.

Example two:

there are three types of services carried by a 4G/5G multimode terminal, namely eMBB service (using S)_eRepresentative), mtc traffic (with S)_mDelegate) and uRLLC service (with S)_uRepresentative). At a certain moment, 10 radio Resources (RBs) need to be applied to carry the eMBB service (S)_eDelegate) services. The 4G/5G multimode terminal selects the service bearing network according to the following steps, namely selecting the 4G or 5G network to bear the service.

Step 1: and calculating the utilization rate of the wireless resources of the 4G and 5G current networks.

Suppose that the occupied (used) radio Resources (RB) of the current network of the 4G network are 30, namely B_4G-UTo 30 under 20MHz networkingThe total radio Resource (RB) of the 4G network is 100, namely B_4G100; the number of occupied (used) radio Resources (RB) of the current network of the 5G network is 210, namely B_5G-U210, under 100MHz networking, the total number of 5G network radio Resources (RBs) is 273, that is: b is_5G＝273。

Therefore, the utilization rate U of the wireless resources of the 4G current network_4GComprises the following steps:

U_4G＝B_4G-U/B_4G＝30/100＝30％

5G current network wireless resource utilization rate U_5GComprises the following steps:

U_5G＝B_5G-U/B_5G＝210/273＝77％

considering that the high and low utilization rate of the network wireless resources will affect the stability of the network operation, in order to ensure the stable operation of the network, the upper limit of the utilization rate of the network wireless resources needs to be set, according to the experience of the operator in network operation for many years, generally, the wireless utilization rate of the network exceeds 60%, the capacity expansion needs to be considered, and the network utilization rate exceeds 80%, the stability of the network will be reduced, so the upper limit of the utilization rate of the network wireless resources is set as H, and the numerical value is set as 80%. Because:

U_4G＝30％＜80％

U_5G＝77％＜80％

step 2 is thus performed.

Step 2: and calculating the utilization rate of the wireless resources of the network after the wireless resources are pre-distributed by the 4G network and the 5G network.

Suppose that the radio resource utilization rates after the 4G and 5G networks pre-allocate 10 radio Resources (RBs) are respectively:

U_4G-B＝(B+B_4G-U)/B_4G＝(10+30)/100＝40％

U_5G-B＝(B+B_5G-U)/B_5G＝(10+210)/273＝81％

due to U_5G-BIs greater than 80%, and U_4G-BIs less than 80%, so step 7 is performed.

And 7: due to U_5G-B81% > 80%, so the multimode terminal chooses to carry this traffic by the 4G network.

The present invention provides a method and a concept for selecting a 4G and 5G multimode terminal network based on service types, and a method and a means for implementing the technical solution are numerous, and the above description 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 embellishments can be made without departing from the principle of the present invention, and these improvements and embellishments should also be regarded as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.

Claims (8)

1. A method for selecting a 4G and 5G multimode terminal network based on service types is characterized by comprising the following steps:

step 1: calculating the utilization rate U of the wireless resources of the 4G and 5G existing networks_4GAnd U_5GThe upper limit of the wireless resource utilization rate is set to be H; if U is_4GNot less than H and U_5GIf not, executing the step 8, otherwise, executing the step 2;

step 2: calculating the network wireless resource utilization rate U after pre-allocating B wireless resources in the 4G and 5G networks_4G-BAnd U_5G-B(ii) a If U is_4G-BNot less than H and U_5G-BIf the H is more than or equal to H, executing the step 8; if U is_4G-B< H and U_5G-B< H, performing step 3; otherwise, executing step 7;

and step 3: calculating normalized equivalent value FA of influencing network selection factor m of 4G and 5G networks_4G-mAnd FA_5G-m；

And 4, step 4: calculating network selection preference factors S for 4G and 5G networks_4G-iAnd S_5G-i；

And 5: calculating network resource matching factor F of 4G and 5G networks_4GAnd F_5G；

Step 6: calculating a 4G/5G multimode terminal network bearing selection factor F, selecting a network according to a calculation result, and then executing the step 9;

and 7: if U is_4G-BNot less than H and U_5G-BIf the number is less than H, the multimode terminal selects a 5G network to bear the service, and step 9 is executed; if U is_5G-BNot less than H and U_4G-B＜HThe multimode terminal selects the 4G network to carry the service, and executes the step 9;

and 8: rejecting the service bearing wireless resource allocation request of the 4G/5G multimode terminal, and executing the step 9;

and step 9: and waiting for the 4G/5G multimode terminal to initiate a new network radio resource bearing request, and then executing the step 1.

2. The method as claimed in claim 1, wherein in step 1, the utilization ratio U of wireless resources of 4G existing network is higher than that of wireless resources of 5G existing network_4GThe calculation formula of (a) is as follows:

U_4G＝B_4G-U/B_4G

5G current network wireless resource utilization rate U_5GThe calculation formula of (a) is as follows:

U_5G＝B_5G-U/B_5G

wherein, B_4G-UFor occupied radio resources in the existing network of 4G networks, B_4GTotal wireless resources for the 4G network; b is_5G-UFor occupied radio resources in the current network of the 5G network, B_5GIs the total wireless resource of the 5G network.

3. The method as claimed in claim 2, wherein in step 2, the 4G network pre-allocates B radio resources to obtain a network radio resource utilization rate U_4G-BThe calculation formula of (a) is as follows:

U_4G-B＝(B+B_4G-U)/B_4G

network wireless resource utilization rate U after pre-allocating B wireless resources for 5G network_5G-BThe calculation formula of (a) is as follows:

U_5G-B＝(B+B_5G-U)/B_5G。

4. the method as claimed in claim 3, wherein the step 3 is performed to the factor affecting network selectionThe normalization equivalent value of the factor m influencing the network selection is marked as FA in the normalization processing within a period of time T_m，m∈[1，N]N is the total number of factors affecting network selection; the factors influencing network selection are divided into two types, wherein the larger the numerical value is, the better the network performance is; the other is that the smaller the value, the better the network performance;

for a 4G network:

the larger the numerical value is, the better the network performance is, and the types of factors influencing network selection are subjected to normalized equivalent calculation by adopting the following formula:

FA_4G-m＝(FA_4G-m-a-σ_4G-m)/FA_the-m

the smaller the numerical value is, the better the network performance is, and the types of factors influencing network selection are used for carrying out normalized equivalent calculation:

FA_4G-m＝FA_the-m/(FA_4G-m-a+σ_4G-m)

wherein, FA_the-mFor optimal values in 4G and 5G systems affecting network selection factor m, for the same affecting network selection factor m, FA_the-mTaking the optimal values in the 4G system and the 5G system; FA_4G-m-avTo calculate the arithmetic mean of the normalized equivalence of the influencing network selection factor m over a period of time T, the following formula is used:

σ_4G-min order to influence the variance of the normalized equivalent value of the network selection factor m in the same period of time T, the following formula is adopted for calculation:

for a 5G network:

the larger the numerical value is, the better the network performance is, and the types of factors influencing network selection are subjected to normalized equivalent calculation by adopting the following formula:

FA_5G-m＝(FA_5G-m-a-σ_5G-m)/FA_the-m

the smaller the numerical value is, the better the network performance is, and the types of factors influencing network selection are used for carrying out normalized equivalent calculation:

FA_5G-m＝FA_the-m/(FA_5G-m-av+σ_5G-m)

wherein, FA_5G-m-avTo calculate the arithmetic mean of the normalized equivalence of the influencing network selection factor m over a period of time T, the following formula is used:

σ_5G-min order to influence the variance of the normalized equivalent value of the network selection factor m in the same period of time T, the following formula is adopted for calculation:

5. the method as claimed in claim 4, wherein in step 4, the network selection preference factor of service type i for 4G network is recorded as S_4G-iThe network selection preference factor of the service type i for the 5G network is recorded as S_5G-i(ii) a For 4G and 5G networks, the influence of the factor m influencing network selection when the service type is i in the network bearing selection is defined as an influence factor, and CO is used_i-mIs represented by where m ∈ [1, N ]]；CO_i-mThe value of (A) is calculated by the following formula:

CO_i-m＝abs((FA_4G-m-FA_5G-m)/(FA_4G-m+FA_5G-m))

wherein: abs () is an absolute value dereferencing function;

network selection preference factor S for 4G networks_4G-iMeter (2)The calculation formula is as follows:

network selection preference factor S for 5G networks_5G-iThe calculation formula of (a) is as follows:

wherein: FA_4G-mAnd FA_5G-mRespectively representing normalized equivalent values of network selection influencing factors m of 4G and 5G networks, wherein m belongs to [1, N]。

6. The method as claimed in claim 5, wherein in step 5, F is defined_4GIs a 4G network resource matching factor, F_5GFor the 5G network resource matching factor, the calculation formula is as follows:

F_4G＝S_4G-i+(U_4G/U_4G-B)+Δ_4G-i

F_5G＝S_5G-i+(U_5G/U_5G-B)+Δ_5G-i

wherein: delta_4G-iAnd Δ_5G-iThe resource matching factor offset when the service type is i in the 4G network and the 5G network respectively, and the value of the offset is calculated according to the following formula:

Δ_4G-i＝TH_4G-i/T_4G-i

Δ_5G-i＝TH_5G-i/T_5G-i

wherein: t is_4G-iThe method comprises the steps that a 4G network average time delay within a certain time T is the service with the service type i; TH_4G-iThe method comprises the steps that the average throughput of a 4G network within a certain time T is the service with the service type i; t is_5G-iThe method comprises the steps that a 5G network average time delay within a certain time T is used for a service with a service type i; TH_5G-iFor a service of the service type i,average throughput of the 5G network over a certain time T.

7. The method as claimed in claim 6, wherein in step 6, the 4G/5G multimode terminal network bearer selection factor F is calculated according to the following formula:

F＝max(F_4G，F_5G)

wherein: max () is a function of taking the maximum value when F ═ F_4GIf so, the multi-mode terminal selects the 4G network to carry the service; when F ═ F_5GAnd if so, the multimode terminal selects the 5G network to carry the service.

8. The method as claimed in claim 7, wherein the factors affecting network selection in steps 3 and 4 include network throughput, network delay and network error rate.

Images