CN105338474A - Cellular/WLAN heterogeneous network data fusion method and device - Google Patents

Abstract

The embodiment of the invention provides a cellular/WLAN heterogeneous network data fusion method and device. Firstly a target call access request transmitted by a user is received; target minimum equivalent bandwidth required by the target call access request is determined according to the target call type of the target call access request and the pre-established corresponding relationship between the call type and the minimum equivalent bandwidth; and then the target call access request is responded according to the target minimum equivalent bandwidth required by the target call access request transmitted by the user. With application of the cellular/WLAN heterogeneous network data fusion method and device, data fusion in a cellular/WLAN network can be realized.

Description

Data fusion method and device in cellular/WLAN heterogeneous network

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a data fusion method and apparatus in a cellular/WLAN heterogeneous network.

Background

Future wireless communication can provide an integrated access mode of a cellular network and a WLAN, and wireless Internet and multimedia services are provided for multi-mode access terminal users.

For a cellular/WLAN heterogeneous network formed by integrated access of a cellular network and a WLAN (wireless local area network), a cell may include one or more hot-spot coverage, i.e., one or more WLAN networks. In a network architecture, a WLAN network is completely located in a cell, and WLAN networks in the same cell are independent of each other, i.e., there is no intersection in the geographical location between WLAN networks.

Under the above network architecture, it is a problem to be solved urgently that how to respond to a call access request sent by a user so as to achieve data fusion in a cellular/WLAN network, where the data fusion is a reasonable utilization of network resources of the cellular network and the WLAN network.

Disclosure of Invention

The embodiment of the invention aims to provide a data fusion method and a data fusion device in a cellular/WLAN heterogeneous network, which respond to a target call access request sent by a user so as to realize data fusion in the cellular/WLAN network. The technical scheme is as follows:

the embodiment of the invention provides a data fusion method in a cellular/WLAN heterogeneous network, which comprises the following steps:

receiving a target call access request sent by a user, wherein the target call access request belongs to one call type in a plurality of call types supported by a heterogeneous network;

determining a target lowest equivalent bandwidth required by the target call access request according to the target call type to which the target call access request belongs and a pre-established corresponding relation between the call type and the lowest equivalent bandwidth, wherein network resources of a cellular network and a WLAN network are expressed in an equivalent bandwidth mode in advance;

and judging whether the available equivalent bandwidth of the WLAN is greater than the target lowest equivalent bandwidth or not, if so, admitting the target call access request through the WLAN, and if not, accessing the cellular network according to a preset access control probability.

Optionally, the call type of the target call access request is: a voice call type, a data call type, or a video call type.

Optionally, the method further includes:

and after the target call access request is admitted through the WLAN, if the user moves out of the signal range of the WLAN, switching the target call access request from the WLAN to the cellular network.

The embodiment of the invention provides a data fusion device in a cellular/WLAN heterogeneous network, which comprises:

the device comprises a receiving module, a sending module and a receiving module, wherein the receiving module is used for receiving a target call access request sent by a user, and the target call access request belongs to one call type in a plurality of call types supported by a heterogeneous network;

a determining module, configured to determine a target minimum equivalent bandwidth required by the target call access request according to a target call type to which the target call access request belongs and a correspondence between a call type and a minimum equivalent bandwidth that are pre-constructed, where network resources of a cellular network and a WLAN network are expressed in advance in an equivalent bandwidth manner;

the judging module is used for judging whether the available equivalent bandwidth of the WLAN network is greater than the target lowest equivalent bandwidth or not, and if so, the WLAN access module is triggered; otherwise, triggering the cellular network access module;

the WLAN access module is used for accepting the target call access request through the WLAN network;

and the cellular network access module is used for accessing the cellular network according to a preset access control probability.

Optionally, the call type of the target call access request is: a voice call type, a data call type, or a video call type.

Optionally, the apparatus further comprises:

a switching module, configured to switch the target call access request from the WLAN network to a cellular network if the user moves out of a signal range of the WLAN network after the target call access request is admitted through the WLAN network.

It can be seen that, in the embodiments of the present invention, a method and an apparatus for data fusion in a cellular/WLAN heterogeneous network are provided, where a target call access request sent by a user is responded according to a target minimum equivalent bandwidth required by the target call access request, so as to implement data fusion in the cellular/WLAN network.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic flowchart of a data fusion method in a cellular/WLAN heterogeneous network according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a data fusion apparatus in a cellular/WLAN heterogeneous network according to an embodiment of the present invention.

Detailed Description

In order to solve the problem of the prior art, embodiments of the present invention provide a data fusion method and apparatus in a cellular/WLAN heterogeneous network, which respond to a target call access request sent by a user, thereby implementing data fusion in the cellular/WLAN network.

The embodiment of the invention provides a data fusion method in a cellular/WLAN heterogeneous network, which comprises the following steps:

receiving a target call access request sent by a user, wherein the target call access request belongs to one call type in a plurality of call types supported by a heterogeneous network;

determining a target lowest equivalent bandwidth required by the target call access request according to the target call type to which the target call access request belongs and a pre-established corresponding relation between the call type and the lowest equivalent bandwidth, wherein network resources of a cellular network and a WLAN network are expressed in an equivalent bandwidth mode in advance;

and judging whether the available equivalent bandwidth of the WLAN is greater than the target lowest equivalent bandwidth or not, if so, admitting the target call request through the WLAN, and if not, accessing the cellular network according to a preset access control probability.

Therefore, in the embodiment of the invention, the target call access request is responded according to the target lowest equivalent bandwidth required by the target call access request sent by the user, so that the data fusion in the cellular/WLAN network is realized.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.

The present invention will be described in detail below with reference to specific examples.

Fig. 1 is a flowchart illustrating a data fusion method in a cellular/WLAN heterogeneous network according to an embodiment of the present invention, which may include the following steps:

s101: receiving a target call access request sent by a user, wherein the target call access request belongs to one call type in a plurality of call types supported by a heterogeneous network.

Specifically, the call type of the target call access request is: a voice call type, a data call type, or a video call type.

In the embodiment of the present invention, in order to implement data fusion in the cellular/WLAN heterogeneous network, the type of the target call access request issued by the user may belong to one call type of multiple call types supported by the heterogeneous network, for example: a voice call type, a data call type, or a video call type.

S102: and determining the target lowest equivalent bandwidth required by the target call access request according to the target call type to which the target call access request belongs and the pre-established corresponding relation between the call type and the lowest equivalent bandwidth, wherein the network resources of the cellular network and the WLAN network are expressed in an equivalent bandwidth manner in advance.

For call types accessed to the heterogeneous network, the lowest equivalent bandwidth requirement thereof corresponds to each call type, wherein the equivalent bandwidth occupied by each call type is represented by a basic bandwidth unit, for example: assuming that the lowest equivalent bandwidth corresponding to the voice call type accessed to the heterogeneous network is 1 basic bandwidth unit, the lowest equivalent bandwidth corresponding to the data call type accessed to the heterogeneous network is 2 basic bandwidth units, and the lowest equivalent bandwidth corresponding to the video call type accessed to the heterogeneous network is 4 basic bandwidth units, it is determined that the target lowest equivalent bandwidth required by the voice call type is 1 basic bandwidth unit, the target lowest equivalent bandwidth required by the data call type is 2 basic bandwidth units, and the target lowest equivalent bandwidth required by the video call type is 4 basic bandwidth units.

For clarity of the scheme and layout, how to express the network resources of the cellular network and the WLAN network by means of equivalent bandwidth will be described in the following by way of example.

S103: judging whether the available equivalent bandwidth of the WLAN network is larger than the target lowest equivalent bandwidth or not;

s104: admitting the target call access request through the WLAN network;

s105: access the cellular network with a predetermined access control probability.

In the overlapped area of the cellular network and the WLAN network, because the service provided by the WLAN network is cheap and provides larger bandwidth, the target call access request can be preferentially accessed into the WLAN network regardless of the voice call type, the data call type or the video call type, therefore, for the target call access request sent by the user moving to the overlapped area, if the WLAN network can provide enough available equivalent bandwidth to meet the target minimum equivalent bandwidth requirement, the WLAN network admits the target call access request, and if the WLAN network cannot provide enough available equivalent bandwidth to meet the target minimum equivalent bandwidth requirement, the target call access request accesses the cellular network with a preset access control probability.

Wherein, the access control probability is actually the probability that the user occupies the resource, and is determined according to the following formula:

$p_j^w=\left(\begin{array}{cc}1& N_j^{\left(q\right)}{\&part;}_j<W_j\\ \frac{W_j}{N_j^{\left(q\right)}{\&part;}_j}& N_j^{\left(q\right)}{\&part;}_j\&GreaterEqual;W_j\end{array}\right.---\left(1\right)$

wherein,is phi_jThe equivalent bandwidth of the class traffic,is phi_jThe number of target call access requests required to be accessed in the class service,is phi_jEquivalent bandwidth, W, required for class traffic_jFor phi in cellular networks and WLAN networks_jEquivalent bandwidth available for class traffic.

Therefore, if phi_jThe equivalent bandwidth required by the class service does not exceed phi_jEquivalent bandwidth available for class traffic, then all phi_jThe call access requests in the class service can be accessed to the WLAN network, otherwise, the call access requests are accessed to the cellular network with probability, and the probability is set to enable phi in the cellular network and the WLAN network_jEquivalent bandwidth W available for class traffic_jQuiltThe target call access request is divided equally, and phi in the cellular network and the WLAN network is fully utilized_jEquivalent bandwidth W available for class traffic_j。

Further, the method provided by the embodiment of the present invention may further include:

and after the target call access request is admitted through the WLAN, if the user moves out of the signal range of the WLAN, switching the target call access request from the WLAN to the cellular network.

Because of the mobility of the user, there must be a handover of the target call access request from the WLAN network to the cellular network if the user moves out of the signal range of the WLAN network.

Therefore, in the embodiment of the invention, the target call access request is responded according to the target lowest equivalent bandwidth required by the target call access request sent by the user, so that the data fusion in the cellular/WLAN network is realized.

The following describes how the network resources of the cellular network and the WLAN network are expressed in terms of equivalent bandwidth.

In a cellular network, users of each traffic type have their own fixed power limit, for example: one service type is phi_iUsers of (i ═ 1,2, …, k) are assignedThe power limit of (c). In the cellular network, there are N users of all service types, and one service type is determined to be phi according to the following formula_iThe rate that can be achieved by the user on subcarrier j:

$c_{ij}={\mathrm{Wlog}}_2(1+a\&CenterDot;\frac{G_{ij}{p}_{ij}}{{\mathrm{\&sigma;}}^2})---\left(2\right)$

wherein, W is the bandwidth of a single subcarrier, a is approximately equal to-1.5/log (5BER), and BER is phi_iBit error rate, G, required for a service_ijFor the traffic type phi_iThe channel gain of the user on subcarrier j.

The different types of users are distributed in the cellular network independently of each other, and the mutual influence and phase among the usersMutual interference can be ignored, and the service type phi in the cellular network is obtained through the formula (2)_i(i ═ 1,2, …, k) of user information rate:

$R_i=C_i{\mathrm{Wlog}}_2(1+a_i\&CenterDot;\frac{\stackrel{\&OverBar;}{G_i}\&CenterDot;\stackrel{\&OverBar;}{p_i}}{{\mathrm{\&sigma;}}^2\&CenterDot;C_i}),(i=1,2,\mathrm{...},k)---\left(3\right)$

wherein, C_iFor allocation to a traffic type of phi_iThe number of subcarriers of the user, a_iFor the traffic type phi_iThe bit error rate required for the service of (a),is that the service type is phi_iThe average power limit of the user of (c),for a service type of phi_iThe average channel gain of the user is calculated according to the following formula

$\stackrel{\&OverBar;}{G_i}=\frac{1}{C}\underset{j=1}{\overset{c}{\&Sigma;}}|G_{ij}{|}^2,(i=1,2,\mathrm{...},k)---\left(4\right)$

Wherein C is the total number of subcarriers of the cellular network, G_ijFor the traffic type phi_iThe channel gain of the user on subcarrier j.

Expressing the formula (3) according to the Lagrange seriesThe following formula is obtained by performing the expansion:

${\log }_2(1+a_i\&CenterDot;\frac{\stackrel{\&OverBar;}{G_i}\&CenterDot;\stackrel{\&OverBar;}{p_i}}{{\mathrm{\&sigma;}}^2\&CenterDot;C_i})=\frac{a_i\stackrel{\&OverBar;}{G_i}\stackrel{\&OverBar;}{p_i}}{{\mathrm{\&sigma;}}^2{C}_i}-\frac{1}{2}\frac{a_i^2{\stackrel{\&OverBar;}{G_i}}^2{\stackrel{\&OverBar;}{p_i}}^2}{{\mathrm{\&sigma;}}^4{C_i}^2}+\frac{1}{3}\frac{a_i^3{\stackrel{\&OverBar;}{G_i}}^3{\stackrel{\&OverBar;}{p_i}}^3}{{\mathrm{\&sigma;}}^6{C_i}^3}+\mathrm{...}---\left(5\right)$

reconstructing equation (3) yields the following equation:

$R_i\&ap;C_{i}W(\frac{a_i\stackrel{\&OverBar;}{G_i}\stackrel{\&OverBar;}{p_i}}{{\mathrm{\&sigma;}}^2{C}_i}-\frac{1}{2}\frac{a_i^2{\stackrel{\&OverBar;}{G_i}}^2{\stackrel{\&OverBar;}{p_i}}^2}{{\mathrm{\&sigma;}}^4{Q}^2}),(i=1,2,\mathrm{...},k)---\left(6\right)$

transforming equation (6) into the following equation:

$\frac{R_i}{W}\&ap;\frac{a_i\stackrel{\&OverBar;}{G_i}\stackrel{\&OverBar;}{p_i}}{{\mathrm{\&sigma;}}^2}-\frac{1}{2}\frac{a_i^2{\stackrel{\&OverBar;}{G_i}}^2{\stackrel{\&OverBar;}{p_i}}^2}{{\mathrm{\&sigma;}}^4{C}_i}---\left(7\right)$

transforming equation (7) yields the following equation:

$\frac{a_i^2{\stackrel{\&OverBar;}{G_i}}^2{\stackrel{\&OverBar;}{p_i}}^2}{{\mathrm{\&sigma;}}^4{C}_i}\&ap;\frac{2a_i\stackrel{\&OverBar;}{G_i}\stackrel{\&OverBar;}{p_i}}{{\mathrm{\&sigma;}}^2}-\frac{2R_i}{W}---\left(8\right)$

from equation (8), the following equation is obtained:

$\frac{a_i^2{\stackrel{\&OverBar;}{G_i}}^2{\stackrel{\&OverBar;}{p_i}}^2}{{\mathrm{\&sigma;}}^4{C}_i}=\frac{2{\mathrm{Wa}}_i\stackrel{\&OverBar;}{G_i}\stackrel{\&OverBar;}{p_i}-2R_i{\mathrm{\&sigma;}}^2}{{\mathrm{\&sigma;}}^{2}W}---\left(9\right)$

the following formula is obtained from formula (9):

$C_i\&ap;\frac{{\mathrm{\&sigma;}}^2{\mathrm{Wa}}_i^2{\stackrel{\&OverBar;}{G_i}}^2{\stackrel{\&OverBar;}{p_i}}^2}{{\mathrm{\&sigma;}}^2(2{\mathrm{Wa}}_i\stackrel{\&OverBar;}{G_i}\stackrel{\&OverBar;}{p_i}-2R_i{\mathrm{\&sigma;}}^2)}=\frac{{\mathrm{Wa}}_i^2{\stackrel{\&OverBar;}{G_i}}^2{\stackrel{\&OverBar;}{p_i}}^2}{2{\mathrm{\&sigma;}}^2{\mathrm{Wa}}_i\stackrel{\&OverBar;}{G_i{p}_i}-2R_i{\mathrm{\&sigma;}}^4}---\left(10\right)$

by usingSubstitution of one in equation (10)Gets assigned to a service type of phi_iNumber of subcarriers C of user_iThe formula of (a):

$C_i=\frac{{\mathrm{Wa}}_i^2\left(\underset{j=1}{\overset{c}{\&Sigma;}}\right|G_{ij}{|}^2){\stackrel{\&OverBar;}{p_i}}^2}{2{\mathrm{\&sigma;}}^2{\mathrm{Wa}}_{i}C\left(\underset{j=1}{\overset{c}{\&Sigma;}}\right|G_{ij}{|}^2)\stackrel{\&OverBar;}{p_i}-2R_i{\mathrm{\&sigma;}}^4{C}^2}---\left(11\right)$

since the sum of the bandwidths occupied by all activated users in a time slot in the whole cellular network cannot exceed the total bandwidth of the cellular network, the relationship between the bandwidth occupied by all activated users in a time slot in the whole cellular network and the total bandwidth of the cellular network is determined according to the following formula:

$\underset{i=1}{\overset{k}{\&Sigma;}}{N}_i{C}_i\&le;C---\left(12\right)$

wherein N is_i(i-1, 2, …, k) is activated in a certain time slot in a cellular networkThe service type is phi_i(i ═ 1,2, …, k) and C is the total number of subcarriers in the cellular network, and the relationship between this and the total bandwidth of the cellular network is determined according to the following equation:

C·W＝W₀(13)

wherein, W₀Is the total bandwidth of the entire cellular network.

Multiplying both the left and right ends in equation (12) by W at the same time, the following equation is obtained:

$\underset{i=1}{\overset{k}{\&Sigma;}}{N}_i{C}_{i}W\&le;CW---\left(14\right)$

c in the formula (14)_iW and CW are respectively replaced byAnd W₀Then equation (14) can be simplified as follows:

$\underset{i=1}{\overset{k}{\&Sigma;}}{N}_i{\&part;}_i\&le;W_0---\left(15\right)$

wherein,for a service type of phi_iThe equivalent bandwidth occupied by a user of (i ═ 1,2, …, k) is determined according to the following equation:

${\&part;}_i=C_{i}W---\left(16\right)$

substitution of C in formula (16) with formula (11)_iThe following formula is obtained:

${\&part;}_i=C_{i}W\&ap;\frac{W^2{a}_i^2{\left(\underset{j=1}{\overset{c}{\&Sigma;}}\right|G_{ij}{|}^2)}^2{\stackrel{\&OverBar;}{p_i}}^2}{2{\mathrm{\&sigma;}}^2{\mathrm{Wa}}_{i}C\left(\underset{j=1}{\overset{c}{\&Sigma;}}\right|G_{ij}{|}^2)\stackrel{\&OverBar;}{p_i}-2R_i{\mathrm{\&sigma;}}^4{C}^2}---\left(17\right)$

therefore, different service quality requirements of the users, including bit error rate requirements and rate requirements of the users, are equivalent to different bandwidth resource requirements required by the users.

In a WLAN network, one traffic type is φ_mA user (m ═ 1,2, …, k) generates a data packet which is sent through channel busy detection, transmission wait and possibly multiple collisions until successful transmission.

In a WLAN network, all the businessesThe traffic types all have the same maximum retransmission limit, and phi is calculated according to the following formula_mThe contention window size of the data packet generated by the user of the class service during the k retransmission is as follows:

CW_m(k)＝min(CW_m,max,2^k-1CW_m,min),k＝1,…m_r+1(18)

wherein CW_m,minIs phi_mMinimum contention window, m, for users of class services_rFor maximum retransmission limit, CW_m,maxIs phi_mDetermining CW according to the following formula for maximum contention window of users of the class service_m,max：

${\mathrm{CW}}_{m,max}=2^{m_r}{\mathrm{CW}}_{m,min}---\left(19\right)$

The average waiting time of the user is determined according to the following formula:

$\stackrel{\&OverBar;}{W_m}=\underset{k=1}{\overset{m+1}{\&Sigma;}}{p}_m^{k-1}(1-p_m)\underset{n=1}{\overset{k}{\&Sigma;}}\frac{{\mathrm{CW}}_m\left(n\right)-1}{2}---\left(20\right)$

wherein p is_mIs phi_mDetermining the packet collision probability of packets generated by a user of a class service according to the following formula_m：

$p_m=1-{(1-q_m)}^{N_m-1}\underset{n=1,n\&NotEqual;m}{\overset{S}{\&Pi;}}{(1-q_n)}^{N_n}---\left(21\right)$

Wherein q is_mIs phi_mProbability of a user of a class service transmitting a data packet within a time slot.

If more than one user transmits a packet in the same time slot, then collisions between packets occur and under conditions where the sequence is not null, φis determined according to the following equation_mConditional transmission probability of users of class service:

wherein the queue non-null probability is lambda_mT_m，T_mFor equivalent occupied channel time, E [ A ]_m]Is phi_mUser of class service is at T_mThe average number of transmissions over time is determined according to the following equation:

$E\&lsqb;A_m\&rsqb;=\underset{k=1}{\overset{m_r+1}{\&Sigma;}}{\mathrm{kp}}_m^{k-1}(1-p_m)=\frac{1-p_m^{m_r}}{1-p_m}\&ap;\frac{1}{1-p_m}---\left(23\right)$

determining the transmission probability q according to the following formula_m：

$q_m=\frac{E\&lsqb;A_m\&rsqb;}{T_m}{\mathrm{\&lambda;}}_m{T}_m=E\&lsqb;A_m\&rsqb;{\mathrm{\&lambda;}}_m=\frac{{\mathrm{\&lambda;}}_m}{1-p_m}---\left(24\right)$

Substituting equation (23) into equation (21) yields the following equation:

$p_m=1-{(1-\frac{{\mathrm{\&lambda;}}_m}{1-p_m})}^{N_m-1}\underset{n=1,n\&NotEqual;m}{\overset{{}_S}{\&Pi;}}{(1-\frac{{\mathrm{\&lambda;}}_n}{1-p_n})}^{N_n},m=1,\mathrm{...}S---\left(25\right)$

the division φ in the entire WLAN network is determined according to the following formula_mTotal time spent by all other users than the user of the class service:

$(N_m-1){\mathrm{\&lambda;}}_m{T}_m{T}_s+T_m{T}_s{\mathrm{\&Sigma;}}_{n=1,n\&NotEqual;m}^S{N}_n{\mathrm{\&lambda;}}_n---\left(26\right)$

wherein λ is_mT_mT_sFor each phi_mThe time consumed by the user of the class service.

Before a packet is successfully transmitted, it may fail due to collisions, for a phi_mThe average failure times of each successful transmission of the users of the class service are calculated according to the following formula:

$\underset{k=1}{\overset{m_r+1}{\&Sigma;}}(k-1)p_m^{k-1}(1-p_m)---\left(27\right)$

thus, during the equivalent occupied channel time, a phi is calculated according to the following formula_mAverage collision time of class service users:

$\stackrel{\&OverBar;}{T_{cm}}=T_s\underset{k=1}{\overset{m_r+1}{\&Sigma;}}(k-1)p_m^{k-1}(1-p_m)---\left(28\right)$

and in the equivalent channel occupying time, calculating the sum of the time occupied by all users of the WLAN due to collision according to the following formula:

$\frac{1}{2}\&lsqb;(1+(N_m-1\left){\mathrm{\&lambda;}}_m{T}_m\right)\stackrel{\&OverBar;}{T_{c_m}}+T_m{\mathrm{\&Sigma;}}_{n=1,n\&NotEqual;m}^S{N}_n{\mathrm{\&lambda;}}_n\stackrel{\&OverBar;}{T_{c_n}}\&rsqb;---\left(29\right)$

the coefficients in equation (29) take into account that most of the collisions occur when two users transmit simultaneouslyThe effect of (a) is to remove duplicate counts of collision times.

Calculating the equivalent occupied channel time for successfully sending a data packet according to the following formula:

$T_m=(N_m-1){\mathrm{\&lambda;}}_m{T}_m{T}_s+T_m{T}_s{\mathrm{\&Sigma;}}_{n=1,n\&NotEqual;m}^s{N}_n{\mathrm{\&lambda;}}_n+\frac{1}{2}\&lsqb;(1+(N_m-1\left){\mathrm{\&lambda;}}_m{T}_m\right)\stackrel{\&OverBar;}{T_{c_m}}+T_m{\mathrm{\&Sigma;}}_{n=1,n\&NotEqual;m}^s{N}_n{\mathrm{\&lambda;}}_n\stackrel{\&OverBar;}{T_{c_n}}+T_s+\stackrel{\&OverBar;}{W_m}\&rsqb;---\left(29\right)$

for WLAN network stability, the relationship between packet generation rate and packet transmission equivalent rate is determined according to the following formula:

$\frac{{\mathrm{\&lambda;}}_m}{1/T_m}<1---\left(30\right)$

wherein, 1/T_mFor the equivalent rate of packet transmission, λ_mIs one phi_mPacket generation rate of class users.

Will T_mSubstituting equation (30) into equation (30) yields the following equation:

${\mathrm{\&lambda;}}_m{T}_m=\frac{{\mathrm{\&lambda;}}_m(2T_s+2\stackrel{\&OverBar;}{W_m}+\stackrel{\&OverBar;}{T_{c_m}})}{2+{\mathrm{\&lambda;}}_m(2T_s+\stackrel{\&OverBar;}{T_{c_m}})-{\mathrm{\&Sigma;}}_{n=1}^s{N}_n{\mathrm{\&lambda;}}_n(2T_s+\stackrel{\&OverBar;}{T_{c_n}})}<1---\left(31\right)$

because:

${\mathrm{\&Sigma;}}_{n=1}^s{N}_n{\mathrm{\&lambda;}}_n(2T_s+\stackrel{\&OverBar;}{T_{c_n}})<2-2{\mathrm{\&lambda;}}_m\stackrel{\&OverBar;}{W_m}---\left(32\right)$

and isMuch less than 1, equation (32) can be approximated as:

${\mathrm{\&Sigma;}}_{n=1}^s{N}_n{\mathrm{\&lambda;}}_n(2T_s+\stackrel{\&OverBar;}{T_{c_n}})<2---\left(33\right)$

will be provided withSubstituting equation (33) yields the following equation:

${\mathrm{\&Sigma;}}_{n=1}^s{N}_n{\mathrm{\&lambda;}}_n\left(\frac{2-p_n}{2-2p_n}\right)<\frac{1}{T_s}---\left(34\right)$

definition ofIs phi_mThe equivalent bandwidth of the class traffic, equation (34) becomes:

${\mathrm{\&Sigma;}}_{n=1}^s{N}_n{\&part;}_n<\frac{1}{T_s}---\left(35\right)$

wherein,the equivalent bandwidth occupied by all users in a WLAN network,for the size of the WLAN network spectrum, it is determined according to the following formula

$\frac{1}{T_s}=\mathrm{\&omega;}\frac{T}{P_s}---\left(36\right)$

Where ω is the total bandwidth of the WLAN network.

Therefore, under the condition of multi-service, the capacity of the WLAN network is equivalent to broadband expression.

By the method, the network resources of the cellular network and the WLAN network are expressed in an equivalent bandwidth mode.

Corresponding to the method embodiment, the embodiment of the invention also provides a data fusion device in the cellular/WLAN heterogeneous network. Fig. 2 is a schematic structural diagram of a data fusion apparatus in a cellular/WLAN heterogeneous network according to an embodiment of the present invention, where the apparatus includes a receiving module 201, a determining module 202, a determining module 203, a WLAN access module 204, and a cellular network access module 205.

The receiving module 201 is configured to receive a target call access request sent by a user, where the target call access request belongs to one of multiple call types supported by a heterogeneous network.

The determining module 202 is configured to determine a target minimum equivalent bandwidth required by the target call access request according to a target call type to which the target call access request belongs and a correspondence between a call type and a minimum equivalent bandwidth, where network resources of a cellular network and a WLAN network are expressed in an equivalent bandwidth manner in advance.

The determining module 203 is configured to determine whether an available equivalent bandwidth of the WLAN network is greater than the target minimum equivalent bandwidth, and if so, trigger the WLAN access module 204; otherwise, triggering the cellular network access module 205;

the WLAN access module 204 is configured to accommodate the target call access request through the WLAN network;

the cellular network access module 205 is configured to access a cellular network with a predetermined access control probability.

Therefore, in the embodiment of the invention, the target call access request is responded according to the target lowest equivalent bandwidth required by the target call access request sent by the user, so that the data fusion in the cellular/WLAN network is realized.

The call type of the target call access request is as follows: a voice call type, a data call type, or a video call type.

Furthermore, the apparatus provided in the embodiment of the present invention may further include:

a switching module, configured to switch the target call access request from the WLAN network to a cellular network if the user moves out of a signal range of the WLAN network after the target call access request is admitted through the WLAN network.

Therefore, in the embodiment of the present invention, a data fusion apparatus in a cellular/WLAN heterogeneous network is provided, which responds to a target call access request sent by a user according to a target minimum equivalent bandwidth required by the target call access request, so as to implement data fusion in the cellular/WLAN network.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the network embodiment, since it is substantially similar to the method embodiment, the description is simple, and for relevant points, reference may be made to partial description of the method embodiment.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (6)

1. A method for data fusion in a cellular/WLAN heterogeneous network, the method comprising the steps of:

receiving a target call access request sent by a user, wherein the target call access request belongs to one call type in a plurality of call types supported by a heterogeneous network;

determining a target lowest equivalent bandwidth required by the target call access request according to the target call type to which the target call access request belongs and a pre-established corresponding relation between the call type and the lowest equivalent bandwidth, wherein network resources of a cellular network and a WLAN network are expressed in an equivalent bandwidth mode in advance;

and judging whether the available equivalent bandwidth of the WLAN is greater than the target lowest equivalent bandwidth or not, if so, admitting the target call access request through the WLAN, and if not, accessing the cellular network according to a preset access control probability.

2. The method of claim 1, wherein the call type of the target call access request is: a voice call type, a data call type, or a video call type.

3. The method of claim 1, further comprising:

and after the target call access request is admitted through the WLAN, if the user moves out of the signal range of the WLAN, switching the target call access request from the WLAN to the cellular network.

4. An apparatus for data fusion in a cellular/WLAN heterogeneous network, the apparatus comprising:

the device comprises a receiving module, a sending module and a receiving module, wherein the receiving module is used for receiving a target call access request sent by a user, and the target call access request belongs to one call type in a plurality of call types supported by a heterogeneous network;

a determining module, configured to determine a target minimum equivalent bandwidth required by the target call access request according to a target call type to which the target call access request belongs and a correspondence between a call type and a minimum equivalent bandwidth that are pre-constructed, where network resources of a cellular network and a WLAN network are expressed in advance in an equivalent bandwidth manner;

the judging module is used for judging whether the available equivalent bandwidth of the WLAN network is greater than the target lowest equivalent bandwidth or not, and if so, the WLAN access module is triggered; otherwise, triggering the cellular network access module;

the WLAN access module is used for accepting the target call access request through the WLAN network;

and the cellular network access module is used for accessing the cellular network according to a preset access control probability.

5. The apparatus of claim 4, wherein the call type of the target call access request is: a voice call type, a data call type, or a video call type.

6. The apparatus of claim 4, further comprising:

a switching module, configured to switch the target call access request from the WLAN network to a cellular network if the user moves out of a signal range of the WLAN network after the target call access request is admitted through the WLAN network.