CN101179321A - Method for implementing wireless resource management of satellite communication system - Google Patents
Method for implementing wireless resource management of satellite communication system Download PDFInfo
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- CN101179321A CN101179321A CNA2007101985655A CN200710198565A CN101179321A CN 101179321 A CN101179321 A CN 101179321A CN A2007101985655 A CNA2007101985655 A CN A2007101985655A CN 200710198565 A CN200710198565 A CN 200710198565A CN 101179321 A CN101179321 A CN 101179321A
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Abstract
The invention discloses a method of wireless source management, which is based on a satellite communication system to judge whether the requests of the master station received from different small stations come from the same small station group. If the requests are not from the same small station, responses are made firstly to the requests from the small station that pays more. When the cumulative flow of the small station exceeds the corresponding guaranteed bandwidth of the small station, the unoccupied sources in the system are used by means of weighted sharing, but the total use does not exceed the corresponding peak bandwidth of the small station. If the requests come from the same payment group, comparisons are made in turn to see whether the service class and the cumulative flow of the requests are identical or not. If the service class is not the same kind, the requests are treated differently by judging the service priority and calculating the current occupation situation of the bandwidth in the system. When the service class and the cumulative flow are both identical, a response is made randomly to any one of the requests; when the service class is identical but the cumulative flow is not, the requests of the small station with a lower cumulative volume acquire channel resource with priority. The invention improves the service quality and the capacity of system of the return links connected to the small stations.
Description
Technical field
The present invention relates to the method that a kind of satellite communication system realizes RRM, particularly at the management method of the return link resource allocation of DVB-RCS system.
Background technology
Satellite communication is not subjected to the constraint of geographical environment and distance, and it is put multiple spot, puts face ground covering advantage and flexible movement, makes satellite communication that remarkable advantages be arranged in the communications field.Along with developing rapidly of satellite wideband multimedia communication, satellite communication system is to supporting high transmission rate more, bigger capacity, the more broadband network system evolution of flexible service, more complicated multimedia service, different QoS requires professional fusion, and the DVB-RCS system that return path is arranged is had higher requirement.In the DVB-RCS system, radio resource management method mainly refers to the Resource Allocation in Networks problem of return path, Internet resources under the M F-TDMA system comprise frequency spectrum resource and bandwidth resources, improve the capacity of system, will so that being provided, user as much as possible insert and guarantee to insert user's link-quality to newly carrying out reasonable distribution to resource.
RRM is to realize return link finite frequency and bandwidth resources key for high-efficient use in the DVB-RCS system, is all bringing into play important effect aspect quality that guarantees network and the capacity.The target of RRM is exactly under the condition of finite element network resource in the satellite communication system, guarantees for the small station in the system provides quality of service.Its basic point of departure is under situations such as network traffic skewness, and flexible allocation and the dynamic available resources of adjusting network improve the wireless frequency spectrum utilance to greatest extent, prevents network congestion and keeps as far as possible little signaling traffic load.
High performance resource allocation policy can make network under the prerequisite that ensures the basic service demand, is in the state of frequency bandwidth resource-sharing efficiently, thereby makes system that bigger user capacity be arranged.The channel resource allocation method that generally adopts both at home and abroad mainly contains two classes at present: a kind of distribution method that is based on traffic packets, rationally dividing professional group and priority, the corresponding occupied bandwidth grade of cooperation lifting strategy is the key that realizes, otherwise can cause the obstruction of high-priority service, cause the deterioration of systematic function; A kind of distribution method that is based on channel reservation, reasonably the channel reservation band-width tactics is the key that realizes, otherwise can cause the waste of bandwidth resources, causes the reduction of power system capacity.
In the existing return link allocation strategy, single employing can not provide the guarantee of primary bandwidth for different paying customers based on the distribution method of traffic packets, and single employing can not embody business that different real-times the require drawback to the bandwidth demand difference based on the distribution method of channel reservation.
Summary of the invention
Technology of the present invention is dealt with problems: at the deficiencies in the prior art, provide a kind of satellite communication system to realize the method for RRM, improve the unjustness that different QoS requires the channel allocation that professional fusion causes, embody the difference of different paying customers on the busy channel resource prioritization, improve the return link service quality in access small station and the capacity of system.
The concrete steps of the inventive method are as follows:
Whether (1) whether the request of judging the different small stations that main website receives from same small station group, promptly from the group of identical paying situation; If different, the request in the more small station of then paying is at first responded, and enters step (2); If identical, then enter step (3);
(2) if the different then request in the more small station of paying is at first responded, when the integrated flux in this small station surpasses the guarantee bandwidth of this small station correspondence, come unappropriated resource in the using system by the weighting sharing mode, but use total amount to be no more than the peak bandwidth of this small station correspondence;
(3) if ask from same paying group, then whether the comparison of request class of service is identical successively, whether integrated flux is identical, and class of service then enters step (4) not simultaneously; Class of service is identical and integrated flux is identical, then random response any one request wherein, identical but the integrated flux of class of service not simultaneously, the small station request that cumulative capacity is lower will preferentially obtain channel resource, to embody the fair principle of identical paying class user;
(4) class of service enters small station different business handling process not simultaneously, and when promptly bandwidth resources were rich, all kinds of business arrived no matter priority just all can be got bandwidth as required; When bandwidth resources satisfy the access demand bandwidth inadequately, then from low to high the business that has inserted is taken the minimizing of resource, to satisfy the bandwidth demand of higher priority business according to the priority orders that pre-defines; If can't satisfy the bandwidth request of higher priority business, then block this business; Described class of service is voice service, video traffic and data service, and wherein the voice service priority level is the highest, secondly is video traffic, is data service at last;
After finishing above-mentioned steps, system receives a new requests for capacity, then enters a new capacity time slot allocation cycle, and the transmission cycle of capacity time slot allocation cycle and superframe is consistent.
From low to high the business that has inserted is taken the minimizing of resource in the described step (4) according to the priority orders that pre-defines, to satisfy the bandwidth demand of higher priority business; If can't satisfy the bandwidth request of higher priority business, then block this professional flow process and be:
(a) at first determine service priority according to type of service, whether remaining bandwidth satisfies this service request bandwidth in the computing system then, if satisfy then accept this service request, if do not satisfy then detect the service access whether time preferential rank and worst priority level are arranged in the current system, and if not current this service request get clogged idling-resource arranged in system.
(b) if there is the business of worst priority level to take system resource, then reduce this worst preferential occupied bandwidth, the allocated bandwidth that frees out is to the not high requested service of current priority, do not have only time preferential level traffic occupying system resources if there is the business of worst priority level in the system, then reduce the preferential level traffic occupied bandwidth of this time, the allocated bandwidth that frees out is given the business of the priority level of current request.
Described class of service is voice service, video traffic and data service, and wherein the voice service priority level is the highest, secondly is video traffic, is data service at last.When the class of service request was voice service, its handling process was:
(a) when being voice service, whether remaining bandwidth satisfies this voice service bandwidth on demand in the computing system, if satisfy then accept this request, if do not satisfy then detect whether the data service of access and video traffic are arranged in the current system, and if not the current voice request get clogged idling-resource arranged in system;
(b) if there is data service to take system resource, then reduce the data service occupied bandwidth, the allocated bandwidth that frees out is given the voice service of current request, do not have only the video traffic occupying system resources if there is data service in the system, then reduce the video traffic occupied bandwidth, the allocated bandwidth that frees out is given the voice service of current request.
When the class of service request was video traffic, its handling process was:
(a) when being video traffic, whether remaining bandwidth satisfies this video traffic bandwidth on demand in the computing system, if satisfy then accept this request, if do not satisfy then detect whether the access data service is arranged in the current system, if not the current video request get clogged idling-resource arranged in system;
(b) if there is data service to take system resource, then reduce the data service occupied bandwidth, the allocated bandwidth that frees out is given the video traffic of current request.
When the service request classification was data service, its handling process was: whether remaining bandwidth satisfies this data service bandwidth on demand in the computing system, if satisfy then accept this request, if do not satisfy then the current data request gets clogged idling-resource is arranged in system.
The present invention's beneficial effect compared with prior art is:
(1) by paying situation grouping small station strategy: the small station that the paying situation is identical divides a small station group into, and for each small station group is divided a capacitance grade, corresponding one guarantees bandwidth and a peak bandwidth, and peak bandwidth is the upper limit of this small station group request resource.This strategy has effectively ensured different paying customers' rights and interests.The small station group higher to capacitance grade when its accumulative total capacity surpasses the assurance bandwidth, can be shared the capacity that utilizes other group by weighting based on the measurement to return link;
(2) fairness allocated bandwidth strategy: utilize the cumulative capacity parameter of adding up to weigh the requests for capacity resource allocation conditions of equal priority business between different small stations, pay the utmost attention to the requests for capacity in the less small station of cumulative capacity;
(3) multipriority multiple QoS class policy: on the allocation strategy, when bandwidth resources were rich, all types of user arrived no matter priority just all can be got bandwidth as required; When bandwidth resources satisfy the access demand bandwidth inadequately, main website is according to the grade of service of dividing in advance, the service degradation of low priority, satisfy the higher priority service request up to the remaining bandwidth resource, but not this low priority service of disposable release, thereby make the request of high priority can apply for required transmission capacity; If in the time of can't satisfying the bandwidth request of higher-priority subscriber, then block this user.
Description of drawings
Fig. 1 is of the present invention from different small station request processing flow figure;
Fig. 2 is small station different business request processing flow figure of the present invention.
Embodiment
A kind of fairness bandwidth allocation methods based on paying situation, multipriority multiple QoS grade that the present invention proposes can be used for the resource allocation of DVB-RCS system return link.The concrete implementation step of the method for the satellite communication system realization RRM that the present invention proposes is described below in conjunction with accompanying drawing:
(1) main website end, each is from the requests for capacity in small station, 6 parameters of one group of correspondence of all resolved one-tenth comprise group number Group_ID, peak bandwidth Peak_BW, ensure bandwidth B ase_BW, integrated flux Cumulative_BW, service priority Priority and bandwidth on demand W;
(2) as shown in Figure 1 from different small stations request processing flow.Judge at first whether the request from different small stations belongs to same small station group, whether the Group_ID that promptly judges request is identical, if difference, then the request preferential answering in the small station of the corresponding more paying group of Group_ID, and do not go the priority of comparison of request business, enter step (3); If identical, then enter step (4);
(3) giving this request according to the Base_BW of Group_ID is provided with one and ensures bandwidth, when Cumulative_BW surpasses Base_BW, based on measurement, come unappropriated resource in the using system by the weighting sharing mode, but its bandwidth resources that take must not surpass Peak_BW to return link; Give the less user of Culmulative_BW big weight, the less weight of the user that Culmulative_BW is bigger is come remaining bandwidth resource in the shared in common system;
(4) relatively whether identical from the type of service of different small stations request, if different, then handle according to the service priority handling process, enter step (5); If it is identical, then relatively whether Cumulative_BW is identical, and the small station request that cumulative capacity is lower will preferentially obtain channel resource, to embody the fair principle of identical paying class user, when the cumulative capacity same case occurring, then random response any one request wherein;
(5) Fig. 2 has provided different business processed flow process and has come handling process, the three class business that have are respectively voice service Vioce, video traffic Video and data service Data, wherein voice service Vioce rank is the highest, next is video Video, be data Data at last, voice service Vioce is the constant rate of speed business, and video traffic Video and data service Data are the variable Rate business; Video traffic speed is divided into 5 ranks; Data service Data utilizes system's remaining available resource to transmit, and has been assigned with an initial transmission rate.The bandwidth that requires is respectively W in real time
Voice, W
VideoAnd W
DataThe number of users of three kinds of business of connecting system is respectively N
Voice, N
VideoAnd N
DataThe number of users that VBR business (video traffic and data service) is accepted bandwidth minimizing service is respectively D
VideoAnd D
DataThe number of users that wherein still can accept bandwidth minimizing service is respectively DD
Video, and DD
DataThe number of users that three kinds of business get clogged is respectively B
Voice, B
VideoAnd B
Data
With the voice service is example, at first determine service priority according to type of service, whether remaining bandwidth satisfies the service request bandwidth in the computing system then, if satisfy then accept this request, do not satisfy and detect then whether the data service of access or video traffic are arranged in the current system, and if not the current voice request get clogged idling-resource arranged in system.
If data service or video traffic have taken system resource, i.e. N
Video＞0 or N
Data＞0, then can accept the data service number of users DD that bandwidth reduces service in the detection system
DataWhether be zero, if non-vanishing then reduce the data service occupied bandwidth, the allocated bandwidth that frees out, if be zero then can accept the video traffic number of users DD that bandwidth reduces service in the detection system if giving the voice service of current request
VideoWhether be zero, if non-vanishing then reduce the video traffic occupied bandwidth, the allocated bandwidth that frees out is given the voice service of current request, if also be zero the current voice request get clogged idling-resource arranged in system.
The disposition when video traffic request arrives and the speech of foregoing description are similar, when system's remaining bandwidth can not satisfy the bandwidth on demand demand, have only data service can discharge bandwidth and redistribute video traffic to current request, i.e. DD
DataReduce the data service occupied bandwidth when non-vanishing and accept the video traffic request; When data service arrives, have only when there is idling-resource in system just can be accepted, otherwise directly get clogged.
When (6) bandwidth resources were rich, all kinds of business arrived no matter priority just all can be got bandwidth as required; When bandwidth resources satisfy the access demand bandwidth inadequately, then from low to high the business that has inserted is taken the minimizing of resource, to satisfy the bandwidth demand of higher priority business according to the priority orders that pre-defines; If can't satisfy the bandwidth request of higher priority business, then block this business;
After the step of above-mentioned when finishing (1)-(6), system receives a new request, then enters a new capacity allocation cycle.The transmission cycle of capacity time slot allocation cycle and superframe is consistent.
In a word, the present invention can support a plurality of small stations (thousands of) connecting system, main website is that resource is allocated in the small station in advance at the different business group, satisfied the requirement that the DVB-RCS system distributes limited return link bandwidth-efficient, improve the utilance of return link capacity, and guaranteed the service quality of service with different priority levels to greatest extent.
Claims (6)
1. a satellite communication system realizes the method for RRM, it is characterized in that step is as follows:
Whether (1) whether the request of judging the different small stations that main website receives from same small station group, promptly from the group of identical paying situation; If different, the request in the more small station of then paying is at first responded, and enters step (2); If identical, then enter step (3);
(2) if the different then request in the more small station of paying is at first responded, when the integrated flux in this small station surpasses the guarantee bandwidth of this small station correspondence, come unappropriated resource in the using system by the weighting sharing mode, but use total amount to be no more than the peak bandwidth of this small station correspondence;
(3) if ask from same paying group, then whether the comparison of request class of service is identical successively, whether integrated flux is identical, and class of service then enters step (4) not simultaneously; Class of service is identical and integrated flux is identical, then random response any one request wherein, identical but the integrated flux of class of service not simultaneously, the small station request that cumulative capacity is lower will preferentially obtain channel resource, to embody the fair principle of identical paying class user;
(4) class of service enters small station different business handling process not simultaneously, and when promptly bandwidth resources were rich, all kinds of business arrived no matter priority just all can be got bandwidth as required; When bandwidth resources satisfy the access demand bandwidth inadequately, then from low to high the business that has inserted is taken the minimizing of resource, to satisfy the bandwidth demand of higher priority business according to the priority orders that pre-defines; If can't satisfy the bandwidth request of higher priority business, then block this business;
After finishing above-mentioned steps, system receives a new requests for capacity, then enters a new capacity time slot allocation cycle, and the transmission cycle of capacity time slot allocation cycle and superframe is consistent.
2. satellite communication system according to claim 1 realizes the method for RRM, it is characterized in that: from low to high the business that has inserted is taken the minimizing of resource in the described step (4) according to the priority orders that pre-defines, to satisfy the bandwidth demand of higher priority business; If can't satisfy the bandwidth request of higher priority business, then block this professional flow process and be:
(1) at first determines service priority according to type of service, whether remaining bandwidth satisfies this service request bandwidth in the computing system then, if satisfy then accept this service request, if do not satisfy then detect the service access whether time preferential rank and worst priority level are arranged in the current system, and if not current this service request get clogged idling-resource arranged in system.
(2) if there is the business of worst priority level to take system resource, then reduce this worst preferential occupied bandwidth, the allocated bandwidth that frees out is to the not high requested service of current priority, do not have only time preferential level traffic occupying system resources if there is the business of worst priority level in the system, then reduce the preferential level traffic occupied bandwidth of this time, the allocated bandwidth that frees out is given the business of the priority level of current request.
3. satellite communication system according to claim 1 and 2 realizes the method for RRM, it is characterized in that: described class of service is voice service, video traffic and data service, wherein the voice service priority level is the highest, secondly is video traffic, is data service at last.
4. satellite communication system according to claim 3 realizes the method for RRM, and it is characterized in that: when the class of service request was voice service, its handling process was:
(1) when being voice service, whether remaining bandwidth satisfies this voice service bandwidth on demand in the computing system, if satisfy then accept this request, if do not satisfy then detect whether the data service of access and video traffic are arranged in the current system, and if not the current voice request get clogged idling-resource arranged in system;
(2) if there is data service to take system resource, then reduce the data service occupied bandwidth, the allocated bandwidth that frees out is given the voice service of current request, do not have only the video traffic occupying system resources if there is data service in the system, then reduce the video traffic occupied bandwidth, the allocated bandwidth that frees out is given the voice service of current request.
5. satellite communication system according to claim 3 realizes the method for RRM, and it is characterized in that: when the class of service request was video traffic, its handling process was:
(1) when being video traffic, whether remaining bandwidth satisfies this video traffic bandwidth on demand in the computing system, if satisfy then accept this request, if do not satisfy then detect whether the access data service is arranged in the current system, if not the current video request get clogged idling-resource arranged in system;
(2) if there is data service to take system resource, then reduce the data service occupied bandwidth, the allocated bandwidth that frees out is given the video traffic of current request.
6. satellite communication system according to claim 1 realizes the method for RRM, it is characterized in that: when the service request classification is data service, its handling process is: whether remaining bandwidth satisfies this data service bandwidth on demand in the computing system, if satisfy then accept this request, if do not satisfy then the current data request gets clogged idling-resource is arranged in system.
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