CN101345999A - Access control method of wireless hybrid network - Google Patents

Access control method of wireless hybrid network Download PDF

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CN101345999A
CN101345999A CNA2008100424906A CN200810042490A CN101345999A CN 101345999 A CN101345999 A CN 101345999A CN A2008100424906 A CNA2008100424906 A CN A2008100424906A CN 200810042490 A CN200810042490 A CN 200810042490A CN 101345999 A CN101345999 A CN 101345999A
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wlan
probability
business
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CN101345999B (en
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王新兵
欧阳文卓
朱力
徐友云
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Shanghai Jiaotong University
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Abstract

The invention relates to an access control method in wireless hybrid network belonging to communication technology field. The method comprises: STEP1, in new voice and new data service, access network is selected by user; in double covered area, user can select to access wireless local network or to access cellular network; in single covered area, user can select to access cellular network directly, or select make a relay communication through the nodes in the double covered area to access the wireless local network utilizing the relay nodes; STEP2, when the user has accessed the network, the network judges whether to allow the new service access according to its own capacity, while the capacity upper limit is not reached, allows the new service access, otherwise, rejects it; STEP 3, the networks switches in the curse of the user moves, and it is considered to converge the cellular network and the wireless local network to share the traffic flow in the mixing network together. The invention enlarges the coverage area of the wireless local network and improves the performance of the mixing network.

Description

Connection control method in the wireless hybrid network
Technical field
The present invention relates to a kind of method of communication technical field, specifically is connection control method in a kind of wireless hybrid network.
Background technology
Because wireless network has its unique attraction, the number of users of wireless network is also in continuous growth.Therefore, the demand for the capacity of wireless network is also increasing rapidly thereupon.Meanwhile, wireless network user to the service demand also in further rising.Can infer that in the near future, the capacity of 3G network also will reach capacity.Simultaneously, the user will be higher for the demand for services of network.The user may need higher-quality service later on, for example high-resolution mobile film, and HDTV (High-Definition Television) is live or the like.So, how to develop the focus that the more powerful 4G cordless communication network of function just becomes current research.A key character of 4G network can merge multiple network exactly, realizes the reasonable resources distribution.These different networks often are operated in different frequency ranges, do not disturb mutually.Therefore, can consider that flow with a certain congested network is diverted in the other network, make the resource of hybrid network be able to dynamic optimization, the resource of heterogeneous networks forms complementation.
Find by prior art documents, W.SONG Y C, ZHUANG W. is at " Proc.IEEE ICC ' 06, vol.12, June 2006, pp.5480-5485. " (institute of electrical and electronic engineers international communication conference in 06 year collection of thesis, publish in June, 2006, the 12nd volume, the 5480-5485 page or leaf) publishes an article in " Calladmission control for integrated voice/data services in cellular/WLANinterworking " (access control of voice and data, services in honeycomb or WLAN (wireless local area network)), proposed " WLAN at first " scheme, in this scheme, any business that enters two overlay areas all at first asks to use WLAN, if request is rejected, then rest in the original cellular network.But this scheme relates to the second order Markov Chain and calculates, and amount of calculation and complexity are huge.In addition, this scheme according to the different different access control schemes of COS definition, is not put on an equal footing different business, is unfavorable for rational Resources allocation.
Yet,, reasonably do not set up mobile subscriber's motion model for above-mentioned research.More than research is that the hypothesis user is in the time of staying of different network areas obeys index distribution or hyperexponential distribution.But in fact this hypothesis might not be realistic.In above-mentioned research work, all be based on such hypothesis: for the business within two overlay areas, can select to insert WLAN or cellular network, but for the business within single overlay area, can only select is to insert cellular network.Yet all research all fails to consider the possibility of utilizing relaying.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, connection control method in a kind of wireless hybrid network has been proposed, node in the two overlay areas of utilization is as via node, make and also can insert WLAN by relay services in single overlay area, like this, for the business within single overlay area, also can select to insert direct cellular network or insert WLAN by relaying.
The present invention is achieved through the following technical solutions, the present invention includes following steps:
Step 1, new speech or new data service freely select to enter network by the user, and in two overlay areas, the user selects to insert WLAN or selects to insert cellular network; In single overlay area, the user selects directly to insert cellular network, or select by with two overlay areas within node carry out trunking traffic, utilize via node to insert WLAN;
Step 2, after step 1 is selected to enter certain network, network based self capacity judges whether to allow to insert this new business, in network, do not reach the upper limit of capacity, allow new business to insert, otherwise should insert by refusal, promptly blocked by conversation, and enter network selection according to user in the step 1 and obtain blocking rate or cutting off rate respectively, blocking rate is meant the situation that can't insert when a service request access hybrid network network, cutting off rate is meant the probability of ongoing dropped calls;
Step 3, when the user when zone moves to the another one zone, the switching between the heterogeneous networks can take place, comprise following three kinds of situations for the access control of the business of switching:
1. when a business when single overlay area is shifted in two overlay areas, if it inserts at the beginning is cellular network, when it enters two overlay areas, it will still rest among the original cellular network, take original frequency band; If what it inserted at the beginning is WLAN, when it enters two overlay areas,, take original bandwidth with utilizing relaying to rest in the original WLAN;
2. when a business is shifted to two overlay area from single overlay area when, if should business be that the via node that utilizes is linked in the WLAN at the beginning, then after it entered WLAN, it was constant still to insert WLAN, takies original bandwidth; If it is to insert in the cellular network at first, after it enters two overlay areas, will at first ask to insert in the WLAN, if request is rejected, it will rest in original cellular network;
3. when a business when cellular unit moves to the another one cellular unit, no matter it is which kind of network that inserts at the beginning, after entering new cellular unit, it is all at first asked by the WLAN in the two overlay areas of via node access; If its request is rejected, this business then continues request and inserts cellular network.
Described pair of overlay area, there are three class channels in user wherein: insert cellular network channel, insert WLAN channel, with single area of coverage in the trunk channel of service communication, suppose that this three classes interchannel is separate irrelevant disturbing.
Described single overlay area, user wherein has two class channels: insert cellular network channel and with the channel of trunking traffic, suppose that these two channels can independently communicate the interference that does not exist each other, and communication of this two covers channel can be carried out simultaneously.
Described user enters network selection and obtains blocking rate or cutting off rate respectively, and is specific as follows:
The probability that the new speech business gets clogged in two overlay areas is: B v dc = v v w B v w + v v c B v c , The probability that new data service gets clogged is: B d dc = θ d w B d w + θ d c B d c , Wherein, θ v wThe expression speech business selects to get involved the probability of WLAN, θ d wThe expression data service selects to insert the probability of WLAN, θ v cThe expression speech business selects to insert the probability of cellular network, θ d cThe expression data service selects to insert the probability of cellular network, θ v c = 1 - θ v w , θ d c = 1 - θ d w ;
The probability that the new speech business gets clogged in single overlay area is: B v co = v v w B v w + v v c B v c , The probability that new data service gets clogged is: B d co = v d w B d w + v d c B d c , Wherein, v v wThe expression speech business selects to insert the probability of WLAN, v d wThe expression data service selects to insert the probability of WLAN, v v cThe expression speech business selects to insert the probability of cellular network, v d cThe expression data service selects to insert the probability of cellular network, v v c = 1 - v v w , v d c = 1 - v d w ;
In above-mentioned two kinds of situations, B d wThe probability that the expression new data service gets clogged in wireless office and network, B v wThe probability that expression new speech business gets clogged in WLAN, B d cThe probability that the expression new data service gets clogged in cellular network, B v cThe probability that gets clogged in the professional cellular network of expression new speech.
Described when a business when cellular unit moves to the another one cellular unit, business in the whole cellular network all only is linked among the WLAN through a relay request, just each is professional only by the two overlay areas of cooperation access of jumping, have and a jumping is only arranged, be called " one jumps cooperation ".
Compared with prior art, the present invention has following beneficial effect:
In traditional access control scheme, owing to do not consider the cooperation between the user, user in single overlay network can only insert wireless cellular network, the present invention considers the access control scheme based on relaying, voice-and-data business in single overlay area can be by the intercommunication mutually between the node, search out node in two overlay areas as via node, thereby access WLAN, so in fact, increased the coverage of WLAN, for the performance that improves hybrid network provides possibility.
Description of drawings
The structural representation of Fig. 1 embodiments of the invention wireless local area network/cellular network.
Speech business curve synoptic diagram in the WLAN in Fig. 2 embodiment of the invention one;
Wherein: (a) being the blocking rate of speech business in the WLAN in the embodiment of the invention one, (b) is the cutting off rate of speech business in the WLAN in the embodiment of the invention one.
Fig. 3 is the blocking rate of speech business in the cellular network in the embodiment of the invention one.
Fig. 4 is the cutting off rate of speech business in single overlay area in the embodiment of the invention one.
Data service curve synoptic diagram in the WLAN in Fig. 5 embodiment of the invention two;
Wherein: (a) being the blocking rate of data service in the WLAN in the embodiment of the invention two, (b) is the blocking rate of data service in the cellular network in the embodiment of the invention two.
Data service curve synoptic diagram in single overlay area in Fig. 6 embodiment of the invention two;
Wherein: (a) being the blocking rate of data service in single overlay area in the embodiment of the invention two, (b) is the blocking rate of data service in two overlay areas in the embodiment of the invention two.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, be the residing wireless local area network/cellular network area of present embodiment, wherein, the subregion is single overlay area of cellular network, part is two overlay areas of cellular network and WLAN, thereby handover network is moved in professional meeting between network, comprise following three kinds: 1. business is shifted to single overlay area from two overlay areas; 2. the professional pair overlay areas of shifting to from single overlay area; 3. business moves to the another one cellular unit from a cellular unit.
The simulated environment parameter of present embodiment is provided with as shown in table 1:
The used parameter of table 1 emulation
Figure A20081004249000081
When emulation, suppose that all channels are ideal communication channel, so there is not the mistake bag.Because this emulation purpose is to investigate the situation with respect to not utilizing relaying, utilizes the performance of the access control protocol of relaying, therefore when emulation,, do not relate to the distribution of network capacity in order to simplify observation.In order not lose representativeness, choose: N v w = 15 、 N d w = 10 、 G v w = 4 、 G d w = 4 、 N v c = 15 、 N d c = 5 , Wherein: N v wBe illustrated in the capacity of speech business in the WLAN, N d wBe illustrated in the capacity of data service in the WLAN, G v wThe bandwidth reserved of expression speech business in WLAN, G d wThe bandwidth reserved of expression data service in WLAN, N v cBe illustrated in the capacity of speech business in the cellular network, N d cBe illustrated in the capacity of data service in the cellular network.
In addition, observe according to emulation, for the service of the service of speech business and data service, the very big difference of existence service time on.For speech business, duration on average continues several minutes, and for data service, if data service inserts in the WLAN, its duration is several seconds only on average, and this is because no LAN can provide very high outstanding data throughput.And if data service inserts cellular network, its average duration also is very little for speech business.So locate hypothesis for data service, its service all is to finish in the zone of inserting at it, do not block so do not exist to switch only to exist.In addition, process for simplifying the analysis, for the time of staying of user in two overlay areas and single overlay area, do not adopt complicated position phase distribution form herein, and only take the form of hyperexponential distribution and exponential distribution, for data service, only consider that also the situation of hyperexponential distribution is so that investigate service quality easily.In addition, for user's mobility model, process is ignored twice above switching here for simplifying the analysis, and the network of promptly ignoring after once switching switches.
Embodiment 1
Present embodiment is about the control method of speech business access network, comprises the steps:
When step 1, new speech arrival, freely select to enter network by the user, in two overlay areas, the user selects to insert WLAN or selects and inserts cellular network, and the probability of the access wireless local area network of speech business is followed successively by: v v w = 0.2 , v v w = 0.5 , v v w = 0.8 ;
Step 2, after step 1 is selected to enter certain network, network based self capacity judges whether to allow to insert this new business, in network, do not reach the upper limit of capacity, permission new business inserts, otherwise should insert by refusal, and enter network selection according to user in the step 1 and obtain blocking rate or cutting off rate respectively;
For the speech business in the LAN, when a new speech business attempts to ask to insert wherein, the probability B of obstruction v w, B v w = Σ i = N v w - G v w G v w π v w ( i ) , And attempt to switch call drop probability D into wherein speech business v w, D v w = π v w ( N v w ) , π Vw(i) probability of stability of voice services volume in the expression WLAN (wireless local area network);
As shown in Figure 2, Fig. 2 (a) is the blocking rate of speech business in the WLAN, and Fig. 2 (b) is the cutting off rate of speech business in the WLAN; As seen from the figure, because the use of junction traffic, make more speech business insert in the WLAN by junction traffic, so cutting off rate in the WLAN and blocking rate increase, can also observe by Fig. 2, when two overlay areas insert or single overlay area in be linked into the probability of WLAN by relaying speech business when increasing, block or cutting off rate all can increase, this is because more traffic carrying capacity means more congested network environment.
Step 3, when the user when zone moves to the another one zone, the switching between the heterogeneous networks may take place, the access control problem for the business of switching comprises following two kinds of situations:
1. the switching from two overlay areas to single overlay area, if it inserts at the beginning is cellular network, when it enters single overlay area, it will still rest among the original cellular network, take original frequency band; If what it inserted at the beginning is WLAN, when it enters single overlay area,, take original bandwidth with utilizing relaying to rest in the original WLAN;
As shown in Figure 3, because the shunting action of WLAN, cellular network congested has reduction.This is because the speech business in single overlay area can insert WLAN by relaying, has therefore alleviated the obstruction of cellular network.
2. when a business is shifted to two overlay area from single overlay area when, if should business be that the via node that utilizes is linked in the WLAN at the beginning, then after it entered two overlay areas, it was constant still to insert WLAN, takies original bandwidth; If it is to insert in the cellular network at first, after it enters two overlay areas, will at first ask to insert in the WLAN, if request is rejected, it will rest in original cellular network;
As shown in Figure 4, cutting off rate for speech business in single overlay area, for the speech business in single overlay area, when the likelihood ratio of its use relaying was less, its cutting off rate was lower, this be since at this moment most of business will insert cellular network, the WLAN Congestion Level SPCC is low comparatively speaking, and along with the increase of the probability that uses relaying, WLAN is congested gradually, though and the congested of cellular network alleviated to some extent at this moment, though still fail to remedy the congested increase of WLAN.The probability that uses relaying to insert WLAN in business approaches in 1, though at this moment WLAN exist congested, cellular network no longer congested, therefore, cutting off rate reduces, so show a convex curve among Fig. 4.
Embodiment 2
Present embodiment is about the control method of data service access network, comprises the steps:
Step 1, new data service freely select to enter network by the user, and in two overlay areas, the user selects to insert WLAN or selects and inserts cellular network, and the probability of the access wireless local area network of new data service is followed successively by: v d w = 0.2 , v d w = 0.5 , v d w = 0.8 ;
Step 2, after step 1 is selected to enter certain network, network based self capacity judges whether to allow to insert this new business, in network, do not reach the upper limit of capacity, permission new business inserts, otherwise should insert by refusal, promptly blocked, and enter network selection according to user in the step 1 and obtain blocking rate or cutting off rate respectively by conversation;
When a new data service attempted to ask to insert wherein, the blocking rate of data service was in the WLAN (wireless local area network) B d w = Σ i = N d w - G d w N d w π d w ( i ) , Cutting off rate is D d w = π d w ( N d w ) , π d w(i) probability of stability of data business volume in the expression WLAN (wireless local area network).
As shown in Figure 5, the blocking rate of expression data service, Fig. 5 (a) expression inserts the increase of the probability in the WLAN along with data service in two overlay areas, the blocking rate of WLAN also can rise accordingly, simultaneously, along with the increase of the junction traffic that inserts from single overlay area, the congestion ratio of WLAN also can promote, so blocking rate also rises thereupon; Fig. 5 (b) represents the blocking rate of data service in the cellular network, has the blocking rate of lower data service than the agreement of not using relaying when the access control protocol that uses relaying.As seen from the figure, along with the more and more data business in two overlay networks is divided in the WLAN, the blocking rate of data service descends thereupon in the cellular network.Simultaneously, along with the business in increasing single overlay network is linked in the WLAN by relaying, blocking rate also descends thereupon.
Step 3, the switching of user from single overlay area to two overlay areas, if should business be that the via node that utilizes is linked in the WLAN at the beginning, then after it entered WLAN, it was constant still to insert WLAN, takies original bandwidth; If it is to insert in the cellular network at first, after it enters two overlay areas, will at first ask to insert in the WLAN, if request is rejected, it will rest in original cellular network;
Shown in Fig. 6 (a), be the cutting off rate of data service in single overlay area, can see from figure that along with data service utilizes relaying to insert WLAN with vast scale more, the cutting off rate of data service also constantly reduces thereupon.This is because WLAN can provide good performance for data service, although more and more data service access WLAN is not enough to rapid reaching capacity as speech business.Shown in Fig. 6 (b), for the cutting off rate of data service in two overlay areas, along with data service inserts WLAN with vast scale utilization more, the cutting off rate of data service also constantly reduces thereupon.This is because WLAN can provide good performance for data service, although θ equally v w, be not enough to as yet make WLAN reach capacity near with 1.

Claims (5)

1, connection control method in a kind of wireless hybrid network is characterized in that, comprises the steps:
Step 1, new speech or new data service freely select to enter network by the user, and in two overlay areas, the user selects to insert WLAN or selects to insert cellular network; In single overlay area, the user selects directly to insert cellular network, or select by with two overlay areas within node carry out trunking traffic, utilize via node to insert WLAN;
Step 2, after step 1 is selected to enter certain network, network based self capacity judges whether to allow to insert this new business, in network, do not reach the upper limit of capacity, allow new business to insert, otherwise should insert by refusal, promptly blocked by conversation, and enter network selection according to user in the step 1 and obtain blocking rate or cutting off rate, blocking rate is meant the situation that can't insert when a service request access hybrid network network, cutting off rate is meant the probability of ongoing dropped calls;
Step 3, when the user when zone moves to the another one zone, the switching between the network can take place, comprise following three kinds of situations for the access control of the business of switching:
1. when a business when single overlay area is shifted in two overlay areas, if it inserts at the beginning is cellular network, when it enters two overlay areas, it will still rest among the original cellular network, take original frequency band; If what it inserted at the beginning is WLAN, when it enters two overlay areas,, take original bandwidth with utilizing relaying to rest in the original WLAN;
2. when a business is shifted to two overlay area from single overlay area when, if should business be that the via node that utilizes is linked in the WLAN at the beginning, then after it entered two overlay areas, it was constant still to insert WLAN, takies original bandwidth; If it is to insert in the cellular network at first, after it enters two overlay areas, will at first ask to insert in the WLAN, if request is rejected, it will rest in original cellular network;
3. when a business when cellular unit moves to the another one cellular unit, no matter it is which kind of network that inserts at the beginning, after entering new cellular unit, it is all at first asked by the WLAN in the two overlay areas of via node access; If its request is rejected, this business then continues request and inserts cellular network.
2, connection control method in the wireless hybrid network according to claim 1, it is characterized in that, described pair of overlay area, there are three class channels in user wherein: insert cellular network channel, insert WLAN channel, with single area of coverage in the trunk channel of service communication, this three classes interchannel is separate irrelevant disturbing.
3, connection control method in the wireless hybrid network according to claim 1, it is characterized in that, described single overlay area, user wherein has two class channels: insert cellular network channel and with the channel of trunking traffic, these two channels independently communicate the interference that does not exist each other, and the communication of this two covers channel is carried out simultaneously.
4, connection control method in the wireless hybrid network according to claim 1 is characterized in that, describedly enters network selection according to the user and obtains blocking rate or cutting off rate respectively, and is specific as follows:
The probability that the new speech business gets clogged in two overlay areas is: B v dc = v v w B v w + v v c B v c , The probability that new data service gets clogged is: B d dc = θ d w B d w + θ d c B d c , Wherein, θ v wThe expression speech business selects to get involved the probability of WLAN, θ d wThe expression data service selects to insert the probability of WLAN, θ v cThe expression speech business selects to insert the probability of cellular network, θ d cThe expression data service selects to insert the probability of cellular network, θ v c = 1 - θ v w , θ d c = 1 - θ d w ;
The probability that the new speech business gets clogged in single overlay area is: B v co = v v w B v w + v v c B v c , The probability that new data service gets clogged is: B d co = v d w B d w + v d c B d c , Wherein, v v wThe expression speech business selects to insert the probability of WLAN, v d wThe expression data service selects to insert the probability of WLAN, v v cThe expression speech business selects to insert the probability of cellular network, v d cThe expression data service selects to insert the probability of cellular network, v v c = 1 - v v w , v d c = 1 - v d w ;
In above-mentioned two kinds of situations, B d wThe probability that the expression new data service gets clogged in wireless office and network, B v wThe probability that expression new speech business gets clogged in WLAN, B d cThe probability that the expression new data service gets clogged in cellular network, B v cThe probability that gets clogged in the professional cellular network of expression new speech.
5, connection control method in the wireless hybrid network according to claim 1, it is characterized in that, described when a business when cellular unit moves to the another one cellular unit, business in the whole cellular network all only is linked among the WLAN through a relay request, be that each is professional only by the two overlay areas of cooperation access of jumping, have and only have a jumping.
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