CN101778114A - Method for multi-channel parallel transmission of streaming media services on basis of load balance - Google Patents

Method for multi-channel parallel transmission of streaming media services on basis of load balance Download PDF

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CN101778114A
CN101778114A CN201010104112A CN201010104112A CN101778114A CN 101778114 A CN101778114 A CN 101778114A CN 201010104112 A CN201010104112 A CN 201010104112A CN 201010104112 A CN201010104112 A CN 201010104112A CN 101778114 A CN101778114 A CN 101778114A
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network
load
candidate
intensity
module
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CN101778114B (en
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杨勇
许国法
蔡国炎
夏大强
王孟孺
陈宏�
陈晓东
周建海
陈师亮
潘析非
朱军
宋旸
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Radio and Television Group of Zhejiang
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Abstract

The invention relates to a method for the multi-channel parallel transmission of streaming media services on the basis of load balance, so as to solve the problem that the multi-channel parallel transmission thereof is limited by bandwidth or transmission rate in the prior art. The method of the invention comprises the following steps: selecting candidate sets; selecting active sets; distributing the traffic of streaming media services; and processing when the network is overloaded, wherein the candidate sets are subject to an SNR (signal noise ratio) constraint and a load constraint; and according to the type and number of the networks that a multi-mode terminal can access to, the networks having lower load intensity and the corresponding type and number are located in a candidate network list by a JMRRM (joint multi-radio resource management) module, so as to constitute the active sets, i.e., to select the active sets. By taking the quality and congestion level of the wireless network into overall consideration for the selection of the access network, the method of the invention guarantees that the streaming media services can access to the receiving terminal effectively and rapidly; and by introducing the candidate sets and the active sets, the load balance can be rapidly achieved by the two sets when the network is overloaded, thereby avoiding the congestion.

Description

A kind of streaming media service multidiameter delay transmission method based on load balancing
Technical field
The invention belongs to the streaming media service transmission field, relate to the efficiently fast transmission method of a kind of streaming media service to server, specifically be according to the signal to noise ratio of the link of network and load state is selected a plurality of dissimilar wireless networks and reasonable distribution flow in each network, mode transmission stream media service with parallel can carry out the switching of network and redistributing of flow according to the Congestion Level SPCC of network in transmission course.
Background technology
Fast development along with mobile communication and broadband wireless access, the development trend of future mobile communications no longer has been that certain technology occupies absolute advantage, but multiple wireless access technology coexistence, additional mutually provides diversified access service, realizes seamless switching.Under this many wireless access environment, need carry out joint resource management to a plurality of different wireless networks, thereby can rationally adjust the distribution of data flow, adapt to the dynamic change of multiple business demand and quality of wireless network.(JointMulti-Radio Resource Management, JMRRM) system just can realize the resource management of uniting maximally utilising all utilizable Radio Resources by uniting many RRMs.
The JMRRM system is the functional entity of a control aspect, and main effect is that wireless access announcement, wireless access are found, wireless access is selected, carry out load balancing, in reasonable distribution of carrying out flow between a plurality of networks and the switching between the Access Network.End side and network side all possess many RRMs of associating module, and the JMRRM module of the JMRRM module of end side and network side can intercom mutually.
Be based on radio link quality mostly in the existing wireless access selection algorithm and select incoming stream, its objective is in order to obtain to have the wireless path of optimal wireless link condition, thereby can obtain high-quality communication.But this selection algorithm is not considered the Congestion Level SPCC of wireless access, may cause the overload of network.Therefore, the selection of wireless access should be considered radio link quality and Congestion Level SPCC simultaneously, so just can obtain effect preferably.
Simultaneously, the appearance of multi-module radio terminal impels single terminal equipment to connect with multiple network or a plurality of operator simultaneously, transmits data concomitantly.Adopt multimode terminal to solve the bandwidth constraints problem to a certain extent to the high-quality streaming media service of server parallel transmission, but also caused new problem simultaneously, for example under the finite bandwidth that each operator distributes, how to regulate the data transmission rate on each bar link, make data arrive server with the fastest speed.
Summary of the invention
The purpose of this invention is to provide a kind of streaming media service multidiameter delay transmission method based on load balancing.This method can be selected a plurality of available networks according to link-quality and load state, and reasonably distributes the streaming media service flow in a plurality of networks of selecting, makes streaming media service can efficiently be sent to the destination apace.
Processing when the inventive method comprises the distribution of the choosing of the choosing of Candidate Set, Active Set, streaming media service flow and network over loading.
The concrete steps of the inventive method are:
Step (1) is chosen Candidate Set.Described Candidate Set is meant all available wireless network set of terminal; Unite many wireless resource managements by the wireless access announcement function, detect all wireless networks at place, terminal place, select candidate network according to the signal to noise ratio and the Congestion Level SPCC of Radio Link in all wireless networks, concrete method is:
The JMRRM module of a, network side is obtained all detected N TotalThe signal to noise ratio (snr) of individual wireless network is if SNR is greater than i (1≤i≤N Total) the signal-noise ratio threshold SNR of individual network settings I, th, then this wireless network can enter Candidate Set.According to the Shannon theorem, the signal-noise ratio threshold of i network need satisfy R i=W iLog 2(1+SNR I, th), so
Figure GSA00000019067200021
W wherein iBe meant the bandwidth of i network, R i=R Min/ N Mod, R MinThe required minimum-rate of expression streaming media service transmission, N ModThe quantity of the wireless network module that the expression multimode terminal has is promptly passed through N simultaneously ModIndividual network carries out the transmission of streaming media service.
B, except the quality that guarantees Radio Link, also need to decide Candidate Set according to the Congestion Level SPCC of network, Congestion Level SPCC is described by load restraint, and load restraint is that load restraint is expressed as follows for the access that guarantees new arrival business can not have influence on the business that has existed in this network:
ζ current+ζ inc≤ζ th
Wherein, ζ CurrentRepresent intensity of load current in certain candidate network, intensity of load is represented all service traffics take in the network the bandwidth and the ratio of network total bandwidth, ζ IncExpression speed is C Inc=C New/ N ModBusiness Stream insert the intensity of load that this candidate network increases, C NewThe Mean Speed of expression new business; ζ ThThe intensity of load thresholding of representing this candidate network, the i.e. patient loading level of this candidate network.
In different wireless networks, the intensity of load ζ of increase IncBe respectively:
1. in the W-CDMA network,
Figure GSA00000019067200022
Wherein, g represents the interference factor of other sub-districts, is meant presence of intercell interference and total ratio that disturbs; D represents the spreading rate of W-CDMA system; b IncRepresent the bit signal to noise ratio that this business is required.
2. at WiMax TMIn the network, ζ Inc=C Inc/ (4 * M * S * K/T).What wherein, M represented is the quantity of subchannel; S represents the OFDMA symbolic number that each frame comprises; K represents the sub-carrier number of each subchannel; T represents the duration of a frame.
3. at Wi-Fi TMIn the network, in a period of time of Monitoring Data length T oIn, recording the shared duration of transfer of data is T s, then the intensity of load of this candidate network is ζ Current=T s/ T o, the intensity of load of increase is ζ Inc=t/T o, t represents that new business inserts the recruitment of transfer of data duration after this candidate network.
In different wireless networks, intensity of load thresholding ζ ThBe respectively:
4. in the W-CDMA network, adopt dynamic mode to distribute bandwidth, under the lighter situation of intensity of load, can guarantee the bandwidth demand that the user is higher, under the heavier situation of intensity of load, can only guarantee the bandwidth demand that the user is basic, so the intensity of load thresholding gets 0.75～0.85;
5. at WiMax TMIn the network, adopt mode as required to distribute bandwidth, the user asks required bandwidth, allows if this bandwidth demand can be satisfied to insert; If can not being satisfied, this bandwidth demand refuses to insert, so the intensity of load thresholding gets 0.85～0.95;
6. at Wi-Fi TMIn the network, adopt the mode of competition to distribute bandwidth, obtain bandwidth by vying each other between the user, the intensity of load thresholding gets 0.65～0.75.
The network that satisfies constraint of step a signal to noise ratio and step b load restraint constitutes Candidate Set;
Step (2) is chosen Active Set.Described Active Set is meant that current time is used for the network of streaming media service transmission.JMRRM chooses network according to the intensity of load of wireless network in the Candidate Set and constitutes Active Set, is used for the transmission of streaming media service.Concrete method is:
The JMRRM module of network side is that terminal is kept a candidate network table, comprises the type and the current intensity of load ζ of candidate network of candidate network in the candidate network table CunrrentThe type and the quantity of the network that the JMRRM module of network side can insert according to multimode terminal, it in the candidate network table network with less intensity of load of the NetFind respective numbers of the type, constitute Active Set, and Active Set is sent to the JMRRM module of end side, and terminal initiates to insert request according to Active Set.
Step (3) is distributed the streaming media service flow.Be each network reasonable distribution service traffics of Active Set, make streaming media service carry out high efficiency of transmission in parallel mode.The JMRRM module of network side is to this N ActiveIndividual network carries out assignment of traffic, and concrete grammar is:
C, setting assignment of traffic scheme comprise
I. the flow sum that activates network satisfies
Figure GSA00000019067200041
N ActiveNetwork number in the expression Active Set, x i(1≤i≤N Active) flow of expression streaming media service in i network.
II. be W-CDMA as if i network,
Figure GSA00000019067200042
If i network is WiMax TM, ζ i(x i)=ζ I, current+ x i/ (4 * M * S * K/T);
If i network is Wi-Fi TM, ζ i(x i)=(T s+ t)/T o
ζ i(x i) (1≤i≤N Active) total intensity of load after i network of expression adding new business, it is x iFunction.ζ I, currentRepresent i the intensity of load that network is current:
III. exist
Figure GSA00000019067200043
And ζ i(x i)≤ζ I, th(1≤i≤N Active) constraints under, calculate to satisfy
Figure GSA00000019067200044
X iζ wherein I, thThe thresholding of representing the intensity of load of i network; w iBe the weight of diverse network, the reflection user is to the preference of network.P is the power of intensity of load, embodies the fairness of load balancing.
The JMRRM module of d, network side obtains step c to step e assignment of traffic scheme is sent to the JMRRM module of end side, and terminal is carried out the multidiameter delay transmission according to this scheme each network allocation service traffics to Active Set.
The JMRRM module of e, network side is upgraded the load state information of Active Set network.
Step (4) is then transmitted until transmission according to the assignment of traffic scheme in the step (3) and is finished if network does not transship; If network over loading then carries out following processing:
The network of overload takes place in the JMRRM module Active Set of the JMRRM module notice end side of f, network side.
G, renewal Candidate Set according to the choosing method of the Candidate Set in the step (1), are the candidate network table under current network conditions of terminal maintenance again, and the candidate network of searching the network same type that transships with generation in this table.If search less than such network, then notify the JMRRM module of end side, and close such mixed-media network modules mixed-media; If search the number that the number of this type of candidate network is less than the network that overload takes place, then the information with the all-network that searches is sent to end side JMRRM module; If it is identical with the number of the network that overload takes place to search the number of this type of candidate network, then these several network informations are sent to end side JMRRM module; If search the number of the number of this type of candidate network more than the network that overload takes place, then wherein the information of the network with less intensity of load of respective numbers is sent to end side JMRRM module.
H, end side JMRRM module are carried out the switching of network according to the information that network side JMRRM module sends over: remove and being connected of overloaded network, and the network of reselecting in the access step g; Network side JMRRM module is upgraded Active Set simultaneously.
The JMRRM module of i, network side is carried out assignment of traffic to the network in the Active Set again according to the method in the step (3), and scheme is sent to the JMRRM module of end side.
The advantage that the inventive method had:
(1) the present invention has taken all factors into consideration the quality and the Congestion Level SPCC of wireless network to the selection of access network, to guarantee that streaming media service efficiently arrives receiving terminal apace.
(2) introduced Candidate Set and Active Set among the present invention, under the situation of network over loading, can utilize two set to carry out load balancing apace, avoided congested.
(3) the present invention is directed to the limited situation of the network bandwidth, streaming media service is taked the method for multidiameter delay transmission, and the load condition that becomes during according to each network carries out dynamic assignment of traffic.
Description of drawings
Fig. 1 is the schematic diagram of Candidate Set and Active Set;
Fig. 2 is the streaming media service transmission course basic flow sheet based on load balancing.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
The present invention is applicable to efficiently transmitting scene fast of streaming media service.For example user terminal has a large amount of streaming media service need transfer to destination server fast, according to the proposed method, many RRMs of associating module of network side is that user terminal is chosen the Candidate Set network, and be that user terminal is chosen suitable Active Set network according to network type and the quantity that user terminal can insert, user terminal is the reasonable distribution service traffics in each Active Set network, realize the multidiameter delay transmission of Streaming Media.
Described network type is meant the network based on different radio access technologies, as W-CDMA, and WiMAX TMAnd Wi-Fi TM, the network that user terminal can insert can be that the network of same kind also can be a networks of different type.
Fig. 1 is the schematic diagram of Candidate Set and Active Set.End side has W-CDMA, WiMAX TMAnd Wi-Fi TM3 radio access modules, an a certain moment of radio access module can only be inserted a wireless network.JMRRM is by the wireless access announcement function, and all wireless networks that detect place, terminal place have 8, and 4 Wi-Fi are wherein arranged TMWireless access network, 3 WiMAX TMWireless access network and 1 W-CDMA wireless access network.
Fig. 2 is the streaming media service transmission course basic flow sheet based on load balancing.
Specify method of the present invention below in conjunction with Fig. 1 and Fig. 2.
Step 1 is chosen Candidate Set: quality and Congestion Level SPCC according to wireless network are chosen Candidate Set.
1) the JMRRM module of network side detects the signal to noise ratio (snr) of 8 wireless networks among Fig. 1, if SNR is greater than the signal-noise ratio threshold SNR of the individual network settings of i (1≤i≤8) I, th, then i network can enter Candidate Set.According to the Shannon theorem, the signal-noise ratio threshold of i network need satisfy R i=W iLog 2(1+SNR I, th), so
Figure GSA00000019067200061
W wherein iBe meant the bandwidth of i network, R i=R Min/ 3, R MinThe required minimum-rate of expression streaming media service transmission.
2) the JMRRM module of network side detects the Congestion Level SPCC of 8 wireless networks among Fig. 1.Congestion Level SPCC can be described by load restraint, and load restraint is can not have influence on the business that has existed in this network in order to guarantee newly to reach professional access, and load restraint is expressed as follows:
ζ current+ζ inc≤ζ th
ζ wherein CurrentRepresent intensity of load current in certain candidate network, described intensity of load is represented all service traffics take in the network the bandwidth and the ratio of network total bandwidth.ζ IncExpression speed is C Inc=C New/ N ModThe intensity of load that increased of this candidate network of service access, C NewThe Mean Speed of expression new business; ζ ThThe intensity of load thresholding of representing this candidate network, the i.e. patient loading level of this candidate network.
In different wireless networks, the intensity of load ζ of increase IncHave nothing in common with each other:
In the W-CDMA network,
Figure GSA00000019067200062
Wherein g represents the interference factor of other sub-districts, is meant presence of intercell interference and total ratio that disturbs; W represents the spreading rate of W-CDMA system; b IncRepresent the bit signal to noise ratio that this business is required.
At WiMax TMIn the network, ζ Inc=C Inc/ (4 * M * S * K/T); What wherein M represented is the quantity of subchannel; S represents the OFDMA symbolic number that each frame comprises; K represents the sub-carrier number of each subchannel; T represents the duration of a frame.
At Wi-Fi TMIn the network, use T oA period of time length of expression Monitoring Data is at T oIn the duration, the shared duration of transfer of data is T s, think that then the intensity of load of this candidate network is ζ Ourrent=T s/ T o, the intensity of load of increase is ζ Inc=t/T o, t represents that new business inserts the recruitment of transfer of data duration after this candidate network.
In different wireless networks, the thresholding ζ of intensity of load ThAlso have nothing in common with each other:
In the W-CDMA network, adopt dynamic mode to distribute bandwidth, under the lighter situation of intensity of load, can guarantee the bandwidth demand that the user is higher, under the heavier situation of intensity of load, can only guarantee the bandwidth demand that the user is basic, so can choose moderate intensity of load thresholding, in the present embodiment, the intensity of load thresholding of W-CDMA network is made as 0.8;
At WiMax TMIn the network, adopt mode as required to distribute bandwidth, the user asks certain bandwidth, allow to insert if this bandwidth demand can be satisfied, refuse if this bandwidth demand can not be satisfied to insert, so can choose bigger intensity of load thresholding, in the present embodiment, WiMax TMThe intensity of load thresholding of network is made as 0.9;
At Wi-Fi TMIn the network, adopt the mode of competition to distribute bandwidth, obtain bandwidth between the user by vying each other, thus less intensity of load thresholding can be chosen, in the present embodiment, Wi-Fi TMThe intensity of load thresholding of network is made as 0.7.
According to the requirement of choosing of above Candidate Set, in 8 all wireless access networks, have 6 wireless networks and enter Candidate Set, as shown in Figure 2, the 1st WiMax wherein TMWith the 4th Wi-Fi TMDo not meet the requirement of choosing of above-mentioned Candidate Set, therefore do not enter Candidate Set.
Step 2 is chosen Active Set: the JMRRM module of network side is that terminal is kept an above-mentioned candidate network table, comprises the type and the current intensity of load ζ of candidate network of candidate network in the table CurrentMultimode terminal can insert 1 Wi-Fi in Fig. 2 TMNetwork, 1 WiMax TMNetwork and 1 W-CDMA network, so the JMRRM module of network side will be searched the Wi-Fi with minimum load intensity respectively in the candidate network table TM, WiMAX TMWith the W-CDMA Access Network, constitute Active Set, as the 3rd WiMAX among Fig. 2 TM, the 1st W-CDMA and the 1st Wi-Fi TMPromptly constitute Active Set.The JMRRM module of network side sends to the JMRRM module of end side with Active Set, and terminal is the Wi-Fi in Active Set respectively TM, WiMAX TMInitiate to insert request with the W-CDMA network.
Step 3 assignment of traffic: be each network reasonable distribution service traffics of Active Set, make streaming media service carry out high efficiency of transmission in parallel mode.The JMRRM module of network side is carried out assignment of traffic according to Active Set information to 3 above-mentioned networks, and specific algorithm is:
1) uses x 1, x 2And x 3Represent W-CDMA in the Active Set, WiMAX respectively TMAnd Wi-Fi TMThe flow that network allocation arrives, then the flow sum of all activated network satisfies x 1+ x 2+ x 3〉=C New
2) use ζ 1(x 1), ζ 2(x 2), ζ 3(x 3) represent that respectively each network adds total intensity of load after new business, it is x 1, x 2And x 3Function, ζ I, currentRepresent i the intensity of load that network is current, ζ I, thThe thresholding of representing the intensity of load of i network:
The 1st network is W-CDMA,
Figure GSA00000019067200081
ζ 1, th=0.8;
The 2nd network is WiMax TM, ζ 2(x 2)=ζ 2, current+ x 2/ (4 * M * S * K/T), ζ 2, th=0.9;
The 3rd network is Wi-Fi TM, ζ 3(x 3)=(T s+ t (x 3))/T o, t (x wherein 3) expression speed is x 3This candidate network of service access after the recruitment of transfer of data duration, ζ 3, th=0.7.
3) at x 1+ x 2+ x 3〉=C NewAnd ζ i(x i)≤ζ I, thUnder the constraints of (i=1,2,3), calculate and satisfy
Figure GSA00000019067200082
The flow x of each network allocation 1, x 2And x 3W wherein i(1≤i≤3) are the weight of 3 kinds of networks, reflect the preference of user to these 3 kinds of networks, when the user does not have preference to 3 kinds of networks, and optional w 1=w 2=w 3=1/3; As descending W-CDMA, the WiMAX of being followed successively by of user's preference degree TMAnd Wi-Fi TMThe time, optional w 1＜w 2＜w 3, and satisfy w 1+ w 2+ w 3=1.P is the power of intensity of load, embodies the fairness of load balancing, can be made as 2.
The professional transmission of step 4: the assignment of traffic scheme that the JMRRM module of network side obtains above-mentioned algorithm is sent to the JMRRM module of end side, and terminal is carried out the multidiameter delay transmission according to 3 network allocation service traffics of this scheme to Active Set.
In transmission course, cause network over loading as if access owing to other users, for example, the Wi-Fi in the above-mentioned Active Set TMThe service traffics that insert are too much, and intensity of load has surpassed 0.7.In order to guarantee the high efficiency of streaming media service transmission, need in time with this Wi-Fi TMWork flow in the network moves to the lower candidate network of intensity of load.Processing method during network over loading is:
1) Wi-Fi in the JMRRM module Active Set of the JMRRM module of network side notice end side TMNetwork transships.
2) upgrade Candidate Set,, be the candidate network table under current network conditions of terminal maintenance again, and in this table, search other candidate's Wi-Fi according to the method for step 1 TMNetwork.If search Wi-Fi less than the candidate TMNetwork is then notified the JMRRM module of end side, closes Wi-Fi TMThe module of network; If candidate's Wi-Fi TMNetwork has and only has 1, and then the information with this network is sent to end side JMRRM module; If candidate's Wi-Fi TMNetwork is more than 1, then set by step 2 method wherein the information of the network of intensity of load minimum be sent to end side JMRRM module.
3) end side JMRRM module is carried out the switching of network according to the information that network side JMRRM module sends over: remove and overload Wi-Fi TMThe connection of network, and insert 2) Wi-Fi that reselects in TMNetwork; Network side JMRRM module is upgraded Active Set simultaneously.
4) the JMRRM module of network side is carried out assignment of traffic to the network in the Active Set again according to the method for step 3, and scheme is sent to the JMRRM module of end side.
5) continue transmission stream media service according to new assignment of traffic scheme.In transmission course,, then continue transmission stream media service and finish until transmission if no network over loading phenomenon takes place.

Claims (1)

1. streaming media service multidiameter delay transmission method based on load balancing is characterized in that the concrete steps of this method are:
Step (1) is chosen Candidate Set, and described Candidate Set is meant all available wireless network set of terminal; Unite many wireless resource managements by the wireless access announcement function, detect all wireless networks at place, terminal place, select candidate network according to the signal to noise ratio and the Congestion Level SPCC of Radio Link in all wireless networks, concrete method is:
Many RRMs of associating module of a, network side is obtained all detected N TotalThe signal to noise ratio snr of individual wireless network is if SNR is greater than the signal-noise ratio threshold SNR of i network settings I, th, then this wireless network enters Candidate Set, 1≤i≤N Total,
Figure FSA00000019067100011
W wherein iBe meant the bandwidth of i network, R i=R Min/ N Mod, R MinThe required minimum-rate of expression streaming media service transmission, N ModThe quantity of the wireless network module that the expression multimode terminal has promptly can be passed through N simultaneously ModIndividual network carries out the transmission of streaming media service;
B, guarantee newly to arrive professional access and can not have influence on the business that has existed in this network by load restraint, load restraint is expressed as ζ Current+ ζ Inc≤ ζ ThWherein, ζ CurrentRepresent intensity of load current in certain candidate network, intensity of load is represented all service traffics take in the network the bandwidth and the ratio of network total bandwidth, ζ IncExpression speed is C Inc=C New/ N ModBusiness Stream insert the intensity of load that this candidate network increases, C NewThe Mean Speed of expression new business; ζ ThThe intensity of load thresholding of representing this candidate network, the i.e. patient loading level of this candidate network;
The intensity of load ζ that increases in the different wireless networks IncBe respectively:
1. in the W-CDMA network,
Figure FSA00000019067100012
Wherein, g represents the interference factor of other sub-districts, is meant presence of intercell interference and total ratio that disturbs; D represents the spreading rate of W-CDMA system; b IncRepresent the bit signal to noise ratio that this business is required;
2. at WiMax TMIn the network, ζ Inc=C Inc/ (4 * M * S * K/T); What wherein, M represented is the quantity of subchannel; S represents the OFDMA symbolic number that each frame comprises; K represents the sub-carrier number of each subchannel; T represents the duration of a frame;
3. at Wi-Fi TMIn the network, in a period of time of Monitoring Data length T oIn, recording the shared duration of transfer of data is T s, then the intensity of load of this candidate network is ζ Current=T s/ T o, the intensity of load of increase is ζ Inc=t/T o, t represents that new business inserts the recruitment of transfer of data duration after this candidate network;
Intensity of load thresholding ζ in the different wireless networks ThBe respectively:
4. in the W-CDMA network, the intensity of load thresholding ζ that chooses ThBe 0.75～0.85;
5. at WiMax TMIn the network, the intensity of load thresholding ζ that chooses ThBe 0.85～0.95;
6. at Wi-Fi TMIn the network, the intensity of load thresholding ζ that chooses ThBe 0.65～0.75; The network that satisfies constraint of step a signal to noise ratio and step b load restraint constitutes Candidate Set;
Step (2) is chosen Active Set, and described Active Set is meant that current time is used for the network of streaming media service transmission, chooses network according to the intensity of load of wireless network in the Candidate Set and constitutes Active Set, is used for the transmission of streaming media service, and concrete method is:
Many RRMs of associating module of network side is that terminal is kept a candidate network table, comprises the type and the current intensity of load ζ of candidate network of candidate network in the candidate network table CurrentThe type and the quantity of the network that many RRMs of associating module of network side can insert according to multimode terminal, it in the candidate network table network with less intensity of load of the NetFind respective numbers of the type, constitute Active Set, and Active Set is sent to many RRMs of associating module of end side, and terminal initiates to insert request according to Active Set;
Step (3) is distributed the streaming media service flow, and concrete grammar is:
C, setting assignment of traffic scheme comprise:
I. the flow sum that activates network satisfies
Figure FSA00000019067100021
N ActiveNetwork number in the expression Active Set, x iThe flow of expression streaming media service in i network, 1≤i≤N Active
II. if i network is the W-CDMA network, then
Figure FSA00000019067100022
If i network is WiMax TMNetwork, then ζ i(x i)=ζ I, current+ x i/ (4 * M * S * K/T);
If i network is Wi-Fi TMNetwork, then ζ i(x i)=(T s+ t)/T o
ζ i(x i) total intensity of load after i network of expression adding new business, it is x iFunction, 1≤i≤N Active
ζ I, currentRepresent i the intensity of load that network is current;
III. exist
Figure FSA00000019067100031
And ζ i(x i)≤ζ I, th, 1≤i≤N ActiveConstraints under, calculate to satisfy X iζ wherein I, thThe thresholding of representing the intensity of load of i network, w iBe the weight of diverse network, p is the power of intensity of load;
Many RRMs of associating module of d, network side is sent to many RRMs of associating module of end side with the assignment of traffic scheme, and terminal is carried out the multidiameter delay transmission according to this scheme each network allocation service traffics to Active Set;
Many RRMs of associating module of e, network side is upgraded the load state information of Active Set network;
Step (4) is then transmitted until transmission according to the assignment of traffic scheme in the step (3) and is finished if network does not transship; If network over loading then carries out following processing:
The network of overload takes place in many RRMs of associating module Active Set of many RRMs of associating module notice end side of f, network side;
G, renewal Candidate Set: according to step (1) method, be the candidate network table under current network conditions of terminal maintenance again, and the candidate network of in this table, searching the network same type that transships with generation; If search less than such network, then notify many RRMs of associating module of end side, and close such mixed-media network modules mixed-media; If search the number that the number of this type of candidate network is less than the network that overload takes place, then the information of the all-network that searches is sent to end side and unites many RRMs module; If it is identical with the number of the network that overload takes place to search the number of this type of candidate network, then these several network informations is sent to end side and unites many RRMs module; If the number that searches this type of candidate network is more than the number of the network that overload takes place, then wherein the information of the network with less intensity of load of respective numbers is sent to end side and unites many RRMs module;
H, end side are united many RRMs module and are united the information that many RRMs module sends according to network side and carry out the switching of network: remove and being connected of overloaded network, and the network of reselecting in the access step g, network side is united many RRMs module renewal Active Set simultaneously;
Many RRMs of associating module of i, network side is carried out assignment of traffic to the network in the Active Set again according to the method in the step (3), and scheme is sent to many RRMs of associating module of end side.
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