CN101321385A - Cooperation resource management method and system in heterogeneous wireless network - Google Patents

Abstract

The invention relates to the resource managing field of a radio network, especially a method and a system for cooperating with the resource management in an isomerism radio network. When the mobile terminal is updating-accessed to the network, the trigger comprises the resource request message with the network list; when the candidate resources are all in the managing range of the local radio resource managing unit, the local radio resource managing unit decides the target network; when the candidate resources are not in the managing range of the local radio resource managing unit, the local radio resource managing unit adds the local network state information to the resource request message, finally the terminal radio resource managing unit is accessed to the target network according to the deciding result. The invention has the combined accessing control and resource scheduling in the access network with different properties in the isomerism radio network achieving the maximization for the using rate for the isomerism radio network based on the service request.

Description

Cooperation resource management method in the heterogeneous wireless network and system thereof

Technical field

The present invention relates to the resource management field of wireless network, cooperation resource management method and system thereof in particularly a kind of heterogeneous wireless network.

Background technology

Generally believe that following 4G communication network is the environment of multiple heterogeneous wireless network convergence in essence in present wireless network research, the notion of many wireless access (Multi-radio Access) is considered to the most possible existence form of following wireless network.J.Sachs, H.Wiemann, J.Lundsjo, what P.Magnusson delivered is entitled as " Integration ofmulti-radio access in a beyond 3G network " (referring to Proceedings ofPIMRC, Sept.2004, Vol.2, pp.757-762) article, P.Beming, M.Cramby, N.Johansson, J.Lundsjo, G.Malmgren, what J.Sachs delivered is entitled as " Beyond3G radio access network reference architecture " (referring to Proceedings ofVTC 2004 Spring, pp.2047-2051) article, L.Jorguseski, what R.Prasad delivered is entitled as " Overview of Radio Resource Management (RRM) Issues inMulti-radio Access Systems " (referring to 7th European Conference on WirelessTechnology, 2004, pp.97-100) article, and P.Magnusson, F.Berggren, I.Karla, R.Litjens, F.Meago, Haitao Tang, what R.Veronesi delivered is entitled as " Multi-Radio Resource Management for Communication Networksbeyond 3G " (referring to Proceedings of VTC 2005 Fall, Sept.2005, Vol.3 describes this in article pp.1653-1657).For satisfying the development need that following heterogeneous network merges, for providing best, the user connects in any environment, guarantee seamless high-efficiency reliable service, improve the overall performance and the efficient of UNE, the collaborative RRM problem in the heterogeneous wireless network is particularly important.

The conventional wireless resource management all is that the resource at single network inside manages, and does not consider the available resources of other networks, and its target is under band-limited condition, for the wireless user terminal in this network provides the quality of service guarantee.But this isolated resource management mode can not effectively be utilized the network capabilities of following many wireless access, the shortcoming below existing:

When the user produces new business and needs access of radio network, because the user does not know the current network situation, some network free time may occur does not have the user to insert, and causes new user to block and other offered loads are overweight, can't ensure the service quality of different characteristic business.

On the other hand, the user that heterogeneous wireless network is faced moves, when the user moves to the edge of certain network, need switch to other available networks, because the user does not know which network can satisfy business demand, and selection network at random may cause service disconnection, can not guarantee level and smooth vertical switching, can't guarantee user's seamless mobility and professional continuity.

In sum, the conventional wireless resource management is the function of single network inside, can not satisfy the demand that following heterogeneous network merges, can't coordinate the resource between each wireless network, can't distribute the optimum network resource in real time according to user's traffic performance, service quality can't guarantee that the resource utilization of network is low.

Summary of the invention

The present invention has overcome above-mentioned shortcoming, and cooperation resource management method and system thereof in a kind of heterogeneous wireless network are provided.

The present invention solves the technical scheme that its technical problem takes: the cooperation resource management method in a kind of heterogeneous wireless network comprises the steps:

When the mobile terminal to update access network, the terminal wireless resource administrative unit triggers the resource request message that includes the candidate network tabulation;

Described terminal wireless resource administrative unit sends to the local wireless sources administrative unit with described resource request message, checks candidate's resource in the tabulation of described candidate network by described local wireless sources administrative unit;

When described candidate's resource all is in the range of management of described local wireless sources administrative unit, described local wireless sources administrative unit decision objective network, and the result of decision sent to described terminal wireless resource administrative unit;

When described candidate's resource is not in the range of management of described local wireless sources administrative unit, described local wireless sources administrative unit is added the local network state information in the described resource request message to, send to collaborative radio resource managing unit, described collaborative radio resource managing unit decision objective network, and the result of decision sent to described terminal wireless resource administrative unit;

Described terminal wireless resource administrative unit inserts in the objective network according to the described result of decision.

Described local wireless sources administrative unit is added the local network state information in the described resource request message to, send to after the collaborative radio resource managing unit, also can comprise local wireless sources administrative unit send state information request to each candidate network, the local wireless sources administrative unit of each candidate network sends to described collaborative radio resource managing unit with the local network state information.

Described state information request can send to the local wireless sources administrative unit in the management domain of described collaborative radio resource managing unit, or sends in the local wireless sources administrative unit in described other collaborative radio resource managing unit management domains by other collaborative radio resource managing unit.

Can comprise in the tabulation of described candidate network that network parameter that available network sign, portable terminal measure, traffic performance are or/and user preference information.

Described mobile terminal to update access network is in the time of can occurring in portable terminal and produce new business or portable terminal when entering how network overlapped covering regional.

Described resource allocation decisions can adopt based on the simple strategy of differentiating.

Described resource allocation decisions can adopt decision function, described decision function be described network parameter normalized and, and on each normalized network parameter, set weights according to described user preference information.

Described local network state information of adding in the resource request message can comprise that capacity, cell load, overlay area, bandwidth are or/and price.

Described terminal wireless resource administrative unit can insert in the step of objective network according to the result of decision, is to adjust state variable in the transmission control protocol adaptively according to the network resource information that link layer provides.

Cooperation resource management system in a kind of heterogeneous wireless network comprises

The terminal wireless resource administrative unit, be used for when the mobile terminal to update access network, triggering comprises the resource request message of candidate's subnet tabulation, and the result of decision according to local wireless sources administrative unit or collaborative radio resource managing unit are sent inserts objective network;

The local wireless sources administrative unit, be used for checking candidate's resource of described candidate network tabulation, when described candidate's resource all is in the range of management of described local wireless sources administrative unit, described local wireless sources administrative unit decision objective network sends to described terminal wireless resource administrative unit with the result of decision; When described candidate's resource is not in the range of management of described local wireless sources administrative unit, collect the local network state information and add in the described resource request message, send to collaborative radio resource managing unit;

Described collaborative radio resource managing unit is used for the Radio Resource according to each heterogeneous network of collecting, the decision objective network, and the result of decision sent to described terminal wireless resource administrative unit.

The present invention considers the angle of heterogeneous network Radio Resource from integral body, access control and scheduling of resource to the access network that has different qualities in the heterogeneous network is united are satisfying the maximization that realizes the heterogeneous network resource utilization on the basis of business demand.In addition, launch to dispose and the running of business strategy and overall network is associated for operator and Network Provider provide scheme flexibly based on the cooperation resource management of strategy, resource is carried out unified management, reach the target that the global resource optimum used and maximized system benefit.

Description of drawings

Fig. 1 is the control flow chart of the embodiment of the invention one;

Fig. 2 is the theory diagram of the embodiment of the invention two;

The centralized deployment scheme schematic diagram of Fig. 3 for adopting the present invention to realize;

The distributed deployment scheme schematic diagram of Fig. 4 for adopting the present invention to realize;

Fig. 5 is the packet format schematic diagram of resource request message among the present invention;

The comparison schematic diagram of Fig. 6 for resource allocation algorithm and random resource allocation algorithm based on strategy being carried out according to throughput of system;

Fig. 7 is the congestion window schematic diagram of standard TCP and HA-TCP;

Fig. 8 is the datagram sequence number schematic diagram that standard TCP and HA-TCP send.

Embodiment

Embodiment one: be the preferred embodiment of the cooperation resource management method in a kind of heterogeneous wireless network, be illustrated in figure 1 as the control flow chart of present embodiment, comprise the steps:

Step 11, when portable terminal produces new business, or when entering how network overlapped covering regional, each network signal intensity of promptly receiving continues for some time greater than this network signal threshold value and (can use this network to communicate greater than threshold value, can't be connected to this network less than threshold value), the parameter that terminal wireless resource administrative unit (hereinafter to be referred as T-RRM) just begins to measure and collect each wireless network, traffic performance and user preference, trigger resource request (hereinafter to be referred as R-REQ) message afterwards, this request message comprises a candidate network tabulation, this tabulation mainly comprises the available network sign, and the above-mentioned network parameter that terminal records (for example: signal strength signal intensity, the error rates etc.) and basic user profile, described user profile comprises the type of service of the request of initiation, user's network selecting preference and user ID etc.

Step 12, T-RRM sends to the best or current local wireless sources administrative unit (hereinafter to be referred as S-RRM) that connection is arranged of signal quality to this R-REQ message;

Step 13, described S-RRM checks in the candidate network tabulation all candidate's subnets whether in the scope that S-RRM managed, if in its management domain then carry out step 14, otherwise carry out step 15;

Step 14, described S-RRM is based on resource allocation algorithm judgement objective network and carry out step 17;

Step 15 encapsulates R-REQ message after the interpolation local network state information (for example: capacity, cell load, overlay area, bandwidth, price etc.) again, sends to collaborative radio resource managing unit (hereinafter to be referred as Co-RRM) by the report information function.After Co-RRM receives described R-REQ message, the S-RRM of each candidate network sends information request in its management domain, the S-RRM of each candidate network reports the local network state information by the report information function to Co-RRM, if some candidate network is not in its management domain, Co-RRM sends information request to other Co-RRM, and corresponding C o-RRM can report in its management domain the more network state information of the S-RRM of candidate network.

Step 16, described Co-RRM is based on resource allocation policy judgement objective network and carry out step 17;

Step 17, the network allocation result of decision is transferred to T-RRM by 3 layer protocols, and T-RRM carries out the request of access or vertical the switching.

In the present invention, Co-RRM makes the trade-off decision of many wireless access based on resource allocation algorithm for the corresponding mobile terminal, announces target S-RRM afterwards and carries out access control, after portable terminal is connected to new S-RRM, notifies old S-RRM to disconnect old link.

The present invention has proposed a kind of wireless resource allocation methods based on strategy for Co-RRM, for operator and Network Provider provide scheme flexibly, the running of overall network and business strategy is associated.Strategy can be defined as a kind of high-rise statement indication, and it lays down a regulation, and comes the directs network behavior according to some Virtual network operator preferences.Strategy is by using a group policy rule to implement, and wherein each policing rule comprises a set condition and one group of behavior.

We define R and are corresponding wireless access technology (RAT) candidate subset, and in heterogeneous wireless network, R can be { GPRS, UMTS, WiMAX, WLAN}.Definition RAT allocation strategy p can express with function f, and it provides a suitable R AT for each business of user terminal.

From mathematics, tactful p can be expressed as: p=f (η, δ, Λ, μ) ∈ R

Wherein, variable η, δ, μ are the input informations of resource allocation policy, for example, and class of service, available bandwidth, cell load, received signal intensity, price etc.

As example, defined some the simple basis strategies in UMTS and the WLAN UNE scene below:

Based on the simple strategy of class of service, by differentiating whether class of service is real time business, when class of service is to insert cellular communication system when implementing business, for non-real-time service inserts Radio Access Network):

$P=f\left(\mathrm{SC}\right)=\left\{\begin{array}{ccc}\mathrm{UMTS},& \mathrm{if}& \mathrm{SC}=\mathrm{real\; time}\\ \mathrm{WLAN},& \mathrm{if}& \mathrm{SC}=\mathrm{non\; real\; time}\end{array}\right.$

Based on ambulant simple strategy, the terminal of high mobility inserts the network that has than large coverage, and the terminal of Hypomobility inserts the network with less coverage:

$P=f\left(\mathrm{MS}\right)=\left\{\begin{array}{ccc}\mathrm{UMTS},& \mathrm{if}& \mathrm{MS}=\mathrm{high}\\ \mathrm{WLAN},& \mathrm{if}& \mathrm{MS}=\mathrm{low}\end{array}\right.$

Based on the simple strategy of bandwidth, the network that the broadband services access rate is high, the network that the narrow band service access rate is low:

$P=f\left(\mathrm{Bw}\right)=\left\{\begin{array}{ccc}\mathrm{WLAN},& \mathrm{if}& \mathrm{Bw}=\mathrm{wide}\\ \mathrm{UMTS},& \mathrm{if}& \mathrm{Bw}=\mathrm{narrow}\end{array}\right.$

According to these simple basis strategies, further specify when considering a plurality of parameter than sophisticated strategies, we define a decision function:

f＝w _η·N(η)+w _δ·N(δ)+Λ+w _μ·N(μ) (Σw _i＝1)

Decision function be each parameter normalization (N (x)) and, normalization makes that the value of commensurate is not meaningful, multiply by weights (w on each normalized parameter _x) reflect user preferences or the strategy of operator.Specify weights (w according to user preference or operator according to the importance of each parameter _x), each weights sum is 1.We know, the bandwidth that provides when a network A is the twice of another network B, but when the price of network A also was the price twice of network B, network A and network B should be equal to, be that the decision function value equates, consider that logarithmic function can reflect this logic $(\log a-\log b=\log \frac{a}{b}),$ We adopt logarithmic function that parameter is carried out normalization.

When Co-RRM in two candidate network during the decision objective network, if consider three parameters: available bandwidth (B), price (C), received signal intensity (S) can provide the decision function of two candidate network:

f ₁＝w _b·In(B ₁)+w _c·In(1/C ₁)+w _s·In(S ₁)

f ₂＝w _b·In(B ₂)+w _c·In(1/C ₂)+w _s·In(S ₂)

The decision function value of which network is big, just gives corresponding business this network allocation, and we can pass through f ₁-f ₂Value make a strategic decision f ₁-f ₂＞0 explanation network 1 is better than network 2, f ₁-f ₂＜0 explanation network 2 is better than network 1, and the network of decision function value maximum is exactly an optimum network.

Effect with a simple scene explanation decision function.Suppose that a portable terminal is in two wireless networks overlapping covered: network 1 provides 11Mbps bandwidth, 1 yuan of price/time; Network 2 provides 22Mbps bandwidth, 2 yuan of prices/time; When if decision function is only considered bandwidth and two parameters of price:

f ₁＝w _b·In(11Mbps)+w _c·In(1/1) f ₂＝w _b·In(22Mbps)+w _c·In(1/2)

f ₁-f ₂＝w _b·In(11/22)+w _c·In(2/1)＝In2·(w _c-w _b)

Therefore, if " price is more important than bandwidth " and specify w thought by user or operator _c＞w _b, decision function f then ₁＞f ₂, network 1 optimum concerning the user; If " the bandwidth ratio price is important " and specify w thought by user or operator _c＜w _b, f then ₁＜f ₂, network 2 optimum concerning the user.

If the user thinks that price is most important forever, just can be by specifying w _c=1, other weights are 0, and the price that makes decision function only compare each candidate network is adjudicated optimum network.

If the user thinks that bandwidth is most important forever, just can be by specifying w _b=1, other weights are 0, and the bandwidth that makes decision function only compare each candidate network is adjudicated optimum network, and this strategy makes the user always insert idle relatively network, the load balancing that reaches each network that can be indirect.

Embodiment two, are the preferred embodiment of the cooperation resource management method in a kind of heterogeneous wireless network.Be illustrated in figure 2 as the theory diagram of present embodiment, mainly comprise terminal wireless resource administrative unit (hereinafter to be referred as T-RRM), be arranged on mobile terminal side, the parameter that is used to measure each wireless network (for example: signal strength signal intensity, available bandwidth etc.) and type of service (for example: real time business, non-real-time service etc.) and user preference (for example: the preference price, preference safety etc.), produce or measure a plurality of overlapping networks as new business, when vertical (between heterogeneous networks) switching may take place, trigger resource request message (hereinafter to be referred as R-REQ), this request message comprises candidate's subnet tabulation, this tabulation mainly comprises available subnet sign, the signal strength signal intensity that terminal receives, and basic user profile (for example: the type of service of initiating request, user's network selecting preference and user ID etc.), T-RRM also is used for assisting the vertical handover management of terminal, provide measurement parameter in the switch decision stage for decision entity, effectively utilize new Internet resources by adjusting the resource occupation mode adaptively in handover execution stage.Local wireless sources administrative unit (hereinafter to be referred as S-RRM) functional entity, (for example: the BSC of GSM network be arranged on the resource management entity of each network internal, the RNC of WCDMA network, the BS of WiMAX network, the AC of wlan network etc.), be used for (for example access control of traditional RRM, congested control, level (in the consolidated network) is switched, packet scheduling and power control), when the candidate's subnet in the resource request message (R-REQ) that receives is not entirely in its management area, (for example: capacity add the local network state information, cell load, coverage, bandwidth, price etc.) encapsulate this R-REQ after again and send to collaborative radio resource managing unit (hereinafter to be referred as Co-RRM); Co-RRM is arranged on network side, be used to coordinate the Radio Resource between the heterogeneous network, can carry out unified management and coordination to each S-RRM, (for example: priority allocation gives signal strength signal intensity big according to the parameter of wireless network, the network that available bandwidth is big) and type of service (for example: the GSM network is distributed in speech business, video traffic is distributed to wlan network) and user preference is (for example: the low wlan network of distributing to of preference price, the safe GSM of the distributing to network of preference) provides the optimum network resource for the terminal use, guarantee that level and smooth vertical (between heterogeneous networks) switches, and realizes load balancing and utilization of resources between heterogeneous network.

Between the difference in functionality entity mainly comprise alternately the report information function and the decision-making transmitting function.The report information function, T-RRM sends to S-RRM to resource request (R-REQ) message by the report information function, S-RRM sends to its Co-RRM of management to the resource request that encapsulated again (R-REQ) message by the report information function, when Co-RRM needed the network parameter of certain S-RRM, S-RRM reported its network state parameter by the report information function to Co-RRM.Can pass through report information function interactive information between the different Co-RRM entities, make Co-RRM can obtain the not network parameter of the S-RRM in its management domain.The decision-making transmitting function, S-RRM sends to T-RRM to the objective network information of horizontal handover decisions by the decision-making transmitting function, and Co-RRM sends to T-RRM to the objective network information of vertical handover decisions by the decision-making transmitting function, makes T-RRM carry out decision-making.

As shown in Figure 3, the centralized deployment scheme schematic diagram for adopting the collaborative RRM of the present invention to realize.

Co-RRM separates from the local wireless sources administrative unit of each wireless access technology (RAT), deployment is on the independently network entity of network center, each S-RRM in its range of management is carried out unified management and coordination, interconnected between Co-RRM and the S-RRM by open interface, also can make Co-RRM can obtain the not network parameter of the S-RRM in its management domain between the different Co-RRM entities by open interactive interfacing information.Centralized deployment scheme is easy to realize the unified coordination and administration to wireless network resource, can be compatible between Co-RRM entity and the S-RRM entity by the feasible equipment of the interface of an opening of definition from different vendor, workload when the mode that this function is separated also can reduce the upgrading of policy in resource management and algorithm, but the shortcoming time overhead that to be mutual needs between Co-RRM and the S-RRM bigger and take more Internet resources.

As shown in Figure 4, be the distributed deployment scheme schematic diagram that adopts the collaborative RRM of the present invention to realize.

The local wireless sources administrative unit of Co-RRM functional entity and each wireless access technology (RAT) is deployed on the consolidated network entity, equity connects between these network entities, mutual between Co-RRM and the S-RRM by internal interface, can make Co-RRM can obtain the network parameter of S-RRM in other network entities by open interactive interfacing information between the different Co-RRM entities.Distributed deployment scheme extensibility is very good, add new network entity and can not change network configuration before, by the internal interface interactive information of manufacturer's definition, the Co-RRM entity connects the network parameter that obtains S-RRM in other network entities by equity (peer to peer) between Co-RRM entity and the local S-RRM entity.But being the equity of point-to-point between each network entity, shortcoming could realize when only connecting between each wireless access technology (RAT) utmost point close coupling, the resource management entity that needs each network internal (for example: the base station controller of GSM network (BSC), the radio resource controller of WCDMA network (RNC), the radio resource controller of WiMAX network (RRC), the access controller of wlan network (AC) etc.) can be between by open interactive interfacing information, current techniques is difficult in and realizes this utmost point close coupling scheme between 3GPP system and the non-3 GPP system; Along with the increase of network entity number, the linking number between each entity will increase with exponential form in addition, and network size problem that causes and measurability problem.

In the middle of the practical application, suitable scheme can be selected by self-demand by operator, realizes the wireless cooperation RRM.

Fig. 5 is the packet format schematic diagram of resource request message described in the present invention, mainly is divided into four parts:

1. message header (HEADER): comprise message identifier, message numbering also has some routing iinformations, comprises the IP address of target RRM entity, next hop address etc.

Below being the field format of Payload (Payload), is altogether 17 bytes.

2. candidate's list of subnets CNL (Candidate sub-Network List): size is set at 16 bytes, each subnet information unit NIU (sub-Network InformationUnit) comprises 4 bytes, can hold 4 candidate's subnet information unit altogether.During filling according to the order of terminal Measurement Network tabulation, just according to the arrangement of successively decreasing successively of received signal intensity (RSS) size.

Being constructed as follows of each subnet information unit NIU (totally 32 bits):

(1) candidate's subnetwork type NT (sub-Network Type) adopts 2 bits to come marked network type (for example: UMTS 0, and WLAN 1, and WiMAX 2);

(2) candidate's subnet sign, promptly subnet ID NID (sub-Network ID) adopts the sub-district number in 6 bit Unified coding current networks, can identify 128 sub-districts altogether;

(3) network parameter of terminal measurement, be defined as received signal intensity RSS (Received signal strength) at present, because the signal strength signal intensity absolute value of every kind of network does not have comparativity, we carry out adopting 4 bits of encoded after the normalized, are divided into 16 signal strength scales;

(4) sub-network load situation, because the load absolute value of every kind of network does not have comparativity, the percentage that we adopt the load of each network to account for total capacity is LP (Load Percentage) expression load information, adopts 7 bits of encoded.When S-RRM adds this when Co-RRM sends R-REQ because terminal can't the Measurement Network capacity, so the R-REQ that T-RRM sends this be complete zero;

(5) other 13 bits are idle at present, fill other network informations after leaving for, as parameters such as network price, bandwidth.

3. user profile sequence UIS (User Information Sequence): size is 1 byte, comprises

(1) current business traffic identifier, perhaps initiate new service request type FID (serviceFlow ID): we suppose eight kinds of business, adopt 3 bits of encoded;

(2) user's network selecting preference UB (User Bias): four grades, adopt 2 bits to represent;

(3) other 3 bits are standby

4. redundancy check portion C RC: issuable error code in the transmission course is carried out cyclic redundancy check (CRC), guarantee that the message transmission is correct.

When described terminal wireless resource administrative unit inserts objective network according to the result of decision, adopt a kind of adaptive resource matched algorithm, be used for T-RRM and adjust the resource occupation mode adaptively according to the network resource information that link layer provides in the vertical back of switching, make network work at optimum state, improve the heterogeneous network transmission performance effectively.

Vertical (between the different radio access technologies (RAT)) of high-performance (promptly low time delay and low information dropout rate) switches is one of critical function of the collaborative RRM in the heterogeneous wireless network.Under the control of Co-RRM, vertical switching may cause by multiple purpose, and the connection that may cause during for example for fear of current RAT signal variation disconnects; The access that may cause when current RAT transships is blocked; Also may be in order to improve professional service quality.

For maximum is utilized finite wireless resources, execution in the step 17 of the present invention inserts request or vertical switch step, adopt self adaptation vertically to switch (AVHO) mode, be used for T-RRM and adjust the resource occupation mode adaptively according to the network resource information that link layer provides in the vertical back of switching, this method combines two layers of triggering (L2 trigger) mechanism that IEEE802.21 proposes, this mechanism is before network layer is carried out vertical the switching, set up new link by two layers trigger in advance, in two layers of triggering (L2 trigger) mechanism, when link layer detects the signal of new network, just transmit information to network layer, initiate two layers of handoff request, by the link layer detectable signal stage in this mechanism, increase the available bandwidth function of surveying new link, add the bandwidth information of network before and after switching when network layer is transmitted information, the parameter that transport layer is adjusted transport layer adaptively according to the bandwidth information of network effectively utilizes new transmission resource of network.

Because transmission control protocol (TCP) is that it can not be worked in wireless network well for bandwidth fixed or the design of stable cable network, especially in the isomery multi-access environment, bandwidth resources are asymmetric, and when the user moves rapid variation can take place.Slowly start and Congestion Avoidance is two kinds of congestion avoidance algorithms of standard TCP, start threshold value (ssthresh) slowly and congestion window (cwnd) is the state variable of these two kinds of algorithms.The switching perception TCP (HA-TCP) that this method proposes when the TCP transmitting terminal receives two layers of trigger message announcement, will reset the value of ssthresh and cwnd according to following formula in vertical handover procedure.

BW wherein _CurrentBe to switch the bandwidth of network afterwards, BW _BeforeBe to switch the bandwidth of network before,

Trigger calculating and pass to the TCP layer by two layers.Therefore the TCP transmission rate will be carried out adaptive adjustment based on two layers of trigger message announcement, and realize the better utilization of resources.

Fig. 6～Fig. 8 is respectively that the present invention is by emulation throughput of system datagram that obtains and the congestion window that switches perception TCP and the datagram that transmits Sequence Number.

The present invention carries out the emulation proof by NS (Network Simulator, network analog) software and has obtained good effect.Specifically describe as follows:

On existing HMIPv6 emulation platform, realized the Co-RRM function.On this platform, the dual-mode terminal with T-RRM function can be based on mobile IP seamless roam between UTRAN and WLAN.This Co-RRM entity is in the MAP that is responsible for mobile management between the dissimilar access technologies (move and be anchored point).Local S-RRM is arranged in the RNC of UTRAN and the AC of WLAN.

Fig. 6 shows the comparison of resource allocation algorithm and random resource allocation algorithm based on strategy being carried out according to throughput of system, and wherein Shang Fang curve is based on the resource allocation algorithm of strategy, and the curve of below is based on the random resource allocation algorithm.3 UTRAN sub-districts and 3 wlan networks under the same MAP management have been supposed in the scene.It is the tcp traffic of 20kbps and the UDP communication stream that bit rate is 2Mb/s that 10 portable terminals produce bit rate.Employing is based on the simple strategy of class of service: give UTRAN with the TCP traffic assignments, the UDP traffic assignments is given WLAN, because the speed that UTRAN supports is 384kbps, and the bandwidth that WLAN provides is 11Mbps.In emulation, 10 TCP business are opened when emulation begins, and 10 UDP business were opened one by one by the time.Simulation result is with reference to figure 6.

Fig. 7 and Fig. 8 illustrate the congestion window that switches perception TCP (HA-TCP) and the datagram that transmits Sequence Number, the network of having supposed 3 different bandwidths in the scene coexists in same wireless traffic zone, two nonoverlapping WLAN are positioned at a UTRAN coverage, the bandwidth that has 2Mbps and 1Mbps respectively, UTRAN has the bandwidth of 384kbps.Portable terminal moves in the coverage of WLAN2 from the coverage of WLAN1.

Fig. 7 illustrates the congestion window size of standard TCP and HA-TCP.Initial congestion window (cwnd) is 1, and starting threshold value (ssthresh) slowly is 20.Can see that when in the coverage of portable terminal at WLAN1, the TCP transmitting terminal continues to increase congestion window, when portable terminal when WLAN1 vertically switches to UTRAN, the network bandwidth sharply reduces, buffering area begins to be filled.When having taken place that datagram is lost or during unnecessary retransmission, standard TCP transmitting terminal is thought network congestion has been taken place, use is set to half of current congestion window by multiplication demultiplication rule ssthresh, and cwnd is reduced to 1, and such situation has taken place repeatedly.HA-TCP reduces transmission rate immediately, has avoided losing and unnecessary retransmission of mass data newspaper.When portable terminal moves when switching to WLAN2, the network bandwidth sharply increases, and standard TCP is not because ssthresh changes, and congestion window is still very little.HA-TCP then increases transmission rate immediately, has effectively utilized newly-increased available bandwidth.

Fig. 8 illustrates the datagram sequence number of standard TCP and HA-TCP transmission.This figure points out, because this programme has reduced overflowing of buffering area and losing of datagram, so transmission course is more level and smooth than standard TCP.

More than cooperation resource management method in the heterogeneous wireless network provided by the present invention and system thereof are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (10)

1. the cooperation resource management method in the heterogeneous wireless network is characterized in that, comprises the steps:

When the mobile terminal to update access network, the terminal wireless resource administrative unit triggers the resource request message that includes the candidate network tabulation;

Described terminal wireless resource administrative unit sends to the local wireless sources administrative unit with described resource request message, checks candidate's resource in the tabulation of described candidate network by described local wireless sources administrative unit;

When described candidate's resource all is in the range of management of described local wireless sources administrative unit, described local wireless sources administrative unit decision objective network, and the result of decision sent to described terminal wireless resource administrative unit;

When described candidate's resource is not in the range of management of described local wireless sources administrative unit, described local wireless sources administrative unit is added the local network state information in the described resource request message to, send to collaborative radio resource managing unit, described collaborative radio resource managing unit decision objective network, and the result of decision sent to described terminal wireless resource administrative unit;

Described terminal wireless resource administrative unit inserts in the objective network according to the described result of decision.

2. the cooperation resource management method in the heterogeneous wireless network according to claim 1, it is characterized in that: described local wireless sources administrative unit is added the local network state information in the described resource request message to, send to after the collaborative radio resource managing unit, also comprise local wireless sources administrative unit send state information request to each candidate network, the local wireless sources administrative unit of each candidate network sends to described collaborative radio resource managing unit with the local network state information.

3. the cooperation resource management method in the heterogeneous wireless network according to claim 2, it is characterized in that: described state information request sends to the local wireless sources administrative unit in the management domain of described collaborative radio resource managing unit, or sends in the local wireless sources administrative unit in described other collaborative radio resource managing unit management domains by other collaborative radio resource managing unit.

4. the cooperation resource management method in the heterogeneous wireless network according to claim 1 is characterized in that: described mobile terminal to update access network, and when occurring in portable terminal and producing new business or portable terminal when entering how network overlapped covering regional.

5. the cooperation resource management method in the heterogeneous wireless network according to claim 1 is characterized in that: comprise in the tabulation of described candidate network that network parameter that available network sign, portable terminal measure, traffic performance are or/and user preference information.

6. the cooperation resource management method in the heterogeneous wireless network according to claim 5 is characterized in that: described resource allocation decisions adopts based on the simple strategy of differentiating.

7. the cooperation resource management method in the heterogeneous wireless network according to claim 5, it is characterized in that: described resource allocation decisions adopts decision function, described decision function be described network parameter normalized and, and on each normalized network parameter, set weights according to described user preference information.

8. according to the cooperation resource management method in each described heterogeneous wireless network in the claim 1～7, it is characterized in that: described local network state information of adding in the resource request message comprises that capacity, cell load, overlay area, bandwidth are or/and price.

9. according to the cooperation resource management method in each described heterogeneous wireless network in the claim 1～7, it is characterized in that: described terminal wireless resource administrative unit inserts in the step of objective network according to the result of decision, is to adjust state variable in the transmission control protocol adaptively according to the network resource information that link layer provides.

10. the cooperation resource management system in the heterogeneous wireless network is characterized in that, comprising:

The terminal wireless resource administrative unit, be used for when the mobile terminal to update access network, triggering comprises the resource request message of candidate's subnet tabulation, and the result of decision according to local wireless sources administrative unit or collaborative radio resource managing unit are sent inserts objective network;

The local wireless sources administrative unit, be used for checking candidate's resource of described candidate network tabulation, when described candidate's resource all is in the range of management of described local wireless sources administrative unit, described local wireless sources administrative unit decision objective network sends to described terminal wireless resource administrative unit with the result of decision; When described candidate's resource is not in the range of management of described local wireless sources administrative unit, collect the local network state information and add in the described resource request message, send to collaborative radio resource managing unit;

Described collaborative radio resource managing unit is used for the Radio Resource according to each heterogeneous network of collecting, the decision objective network, and the result of decision sent to described terminal wireless resource administrative unit.

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