CN102711118A - Mobile communication system and method - Google Patents
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Abstract
The invention discloses a mobile communication system and method. The system is a heterogeneous integrated network system structure, wherein a cellular network is used as a main body of the structure; a CogMesh node is allocated in a hot cell of the cellular network; a CogAd-hoc node is allocated in a blind area of the cellular network; and the transmission of the cellular network is probably assisted by a newly allocated node with a recognition function. According to the mobile communication system and method, the problems of wireless spectrum resource shortage, network load distribution non-uniformity and the like in the cellular network are solved.
Description
Technical field
The present invention relates to the mobile communication technology field, specially refer to cognitive radio technology wherein, access network technology, Ad-hoc technology and Mesh network technology.
Background technology
In recent years; Technology such as ubiquitous network, Internet of Things is flourish; Follow the proposition of the notion in the wisdom earth, wisdom city, and the intelligent city's construction that is advancing in the world wide, shifted ultimate attainment to the demand of information network construction entire society's life especially; The every profession and trade of social life is longed for information and mechanics of communication industry, and numerous and confused hope can realize such as various communications that outmatch full internet such as traffic, tourism, government's offices by information network.Broadband wireless communication technique is constantly weeded out the old and bring forth the new, but for the cordless communication network technology, bottleneck is frequency spectrum resource forever.The communications industry was perplexed by the contradiction between limited frequency spectrum resources and the growing demand for services in the last few years always; Because the contradiction between the heterogeneous network of network insertion, fusion demand and current isolated island formula that the wireless network design philosophy is caused must be solved by the innovation to network design thought.Have only the current fixed frequency spectrum distribution policy of thorough change, part even all adopt the dynamic frequency spectrum deployment strategy makes multiple technologies can realize frequency spectrum share, could thoroughly change the problem of frequency spectrum resource " scarcity ".
On the other hand, the multi-network coexisted problem of multiple domain will highlight in the future gradually, and this brings very big difficulty can for undoubtedly the development and the construction of wireless network.Covering area overlapping, communication protocol are inconsistent, the service management and control network situation of lack of uniform, not only do not make network ubiquitous, isomery highlight its advantage, make the network environment that face is complicated more on the contrary.We think; The prospect of future communications network is a network schemer ubiquitous, that isomery merges, and multi-access mode is also deposited, multi-node collaborative work; Support seamless mobility in various degree; It is again an intelligentized wireless communication system simultaneously, perception external environment at any time, and according to the change of current network condition self-configuring with response and dynamic self-adapting environment and operation.
Heterogeneous wireless Mesh network is just being made great efforts fusion progressively perfect and multiple Radio Transmission Technology as the important channel that multiple network merges at present, and being intended to provides facility and network service reliably more for the user.Yet various Mesh subnets have different media access control layers and physical layer, and its physical layer of different transmission technologys shows unique characteristic, therefore how to know that these different informations will influence the effect of the network integration greatly.
Cognitive radio technology is as the important means of obtaining the wireless transmission physical layer information; Can detect radio environment automatically; Reconfigure Internet resources, adjustment mode of operation and transmission parameter; Realize the frequency spectrum share of cognitive user and authorized user, not only make the transformation of spectrum utilization mode and the lifting of frequency spectrum service efficiency, and whole architectures of communication networks has been brought potential dramatic change.Cognitive radio networks has intelligent characteristic, seamless fusion heterogeneous network, becomes the focus of each big standardization body, research institution and a large amount of scholar's concerns both at home and abroad through joint resource management rapidly with advantages such as maximization network overall performances with it.Adopt the cognitive ability of cognitive radio, can make limited frequency spectrum resources support the wireless access service that grows with each passing day in theory becomes possibility.
Cognitive radio networks is not only the current spectrum allocation may of a kind of processing, and science and frequency spectrum do not use unbalanced substantive solution; And help to promote the fusion or the interoperability of different networks, with the self-organizing network that possesses the perception self-adaption characteristic basic guarantee is provided for constructing following wireless cognition network.
Cognitive techniques is applied to wireless Mesh netword and the CogMesh node with cognitive features that forms can better be brought into play the advantage of two kinds of technology, to solve frequency spectrum anxiety and the unequal problem of load that occurs in the current wireless communication process.In addition, through being aided with the problem that the CogAd-hoc node with cognitive function solves network blind area of coverage, and then realize providing the seamless communication network of high quality communication service.
Summary of the invention
The technical problem that (one) will solve
The technical problem that the present invention will solve provides a kind of CogMesh/CogAd-hoc chance and assists formula wide area mobile communications network framework, and provides the flow process that this wide area isomery switches.
(2) technical scheme
A kind of mobile communication network is disposed the CogMesh node at the Hot Spot of cellular network, disposes the CogAd-hoc node in the blind area of cellular network, assists the cellular network transmission by CogMesh node with cognitive function and CogAd-hoc node opportunistic.
Wherein, said CogMesh node type of being base station equipment is linked in the IP backbone through mobile switching centre.
Wherein, can set up the data link of multi-hop between the said CogMesh node; When IP backbone produces congested or mobile switching centre when breaking down, the CogMesh node is initiated as required route and is attempted setting up a transmission link through the Mesh multihop path user data is transmitted.
Wherein, said CogAd-hoc node be deployed in whole Access Network as the protection node of the network coverage blind area and border district to realize the seamless covering of network.
Wherein, said CogAd-hoc node will start the Ad-hoc function in the blind area of Access Network and the user of border district, attempt connecting into base station network through the node of other unlatching Ad-hoc function or the multihop path of the preparatory CogAd-hoc node of disposing.
Wherein, Said CogMesh node and CogAd-hoc node have cognitive function; Generate the frequency spectrum resource tabulation according to the frequency spectrum cavity-pocket of the periphery that perceives, and record is through the user's of its access network QoS demand, and frequency spectrum resource and QoS demand information is internodal alternately and then instruct the distribution of idle frequency spectrum through different CogMesh; Choose the frequency range that interferes with each other minimum and service is provided, for the user high quality services as far as possible is provided through utilizing idle frequency spectrum for the user.
A kind of method of mobile communication, said method step is following:
S1, when network is initial, the wireless environment around each CogMesh node detection, and with near cellular basestation and the neighbours CogMesh node switching loading condition separately and the peripheral spectrum utilization situation of perception; According to mutual information, each CogMesh node confirms to use the cost of different frequency bands, chooses suitable frequency band and uses;
S2, after the UE start, the preferential access cellular network of attempting can not meet the demands as if the service quality that can't insert or cellular network provides, and then opens cognition module;
S3; UE is after opening cognition module; The signal strength signal intensity of the CogMesh network of search periphery; When the signal strength signal intensity of CogMesh network reaches the qos requirement of UE, UE will be linked into corresponding C ogMesh node, the CogMesh node can according to this moment network and channel communication conditions select to set up different data feedback channel links; If when the communication link of process CogMesh node can not satisfy the qos requirement of UE, the CogMesh node then notified UE to open the Ad-hoc function;
S4, after UE opened the Ad-hoc function, the CogAd-hoc node of opening the UE of this function simultaneously or disposing in advance around it will be searched was attempted the multi-hop link access network through them;
S5, in the time of still can't finding suitable communications conduit as if UE, UE reduces service Qos requirement, jumps to S2 and carries out network insertion request flow process again;
S6; For the UE of access network; Occur under the congested situation at network; Network side can be notified UE change QoS grade, and UE will attempt keeping the current QoS grade according to other the feasible link paths of process selecting after the S2, and UE just changes the QoS grade repetition S2 flow process afterwards of oneself in the time can't searching out the suitable path access network; S7; UE through CogMesh node or CogAd-hoc node access network needs the periodic situation of surveying peripheral diverse network, when peripheral network environment changes, in order to guarantee communication quality; UE will start handoff procedure, and switching standards is selected according to the flow process after the S2.
Wherein, said step S2 further comprises:
S2.1 will provide service for it by this cellular network if selected cellular basestation can satisfy the desired qos requirement of user;
S2.2 when the signal quality of selected cellular basestation good, but because the user is more causes congested and can't satisfy its desired QoS of user, this cellular network will notify UE to open cognition module, attempt passing through the cognitive nodes access network;
S2.3 crosses difference and can't reach the required qos requirement of UE when the signal strength signal intensity of cellular basestation, and UE will initiatively open cognition module, and attempt through the cognitive nodes access network the cognitive base station of perception periphery.
Wherein, said step S3 further comprises:
S3.1 is when IP backbone network bearing capacity is good, and the CogMesh node then selects up link through mobile switching centre with user access network;
When S3.2 occurs congested or breaks down when the IP backbone network; The CogMesh node starts route finding process as required; Trial is sought through the internodal interconnected link of CogMesh can arrive targeted customer's passage, and utilizes this multihop path to carry out the forwarding of user data;
S3.3 occurs congested or breaks down when the IP backbone network, and when not having the multi-hop link that reaches the targeted customer, the CogMesh node will notify UE unlatching CogAd-hoc function, make it can pass through CogAd-hoc node access network.
Wherein, said step S4 further comprises:
Under same Ad-hoc network, the communication of then directly setting up multi-hop connects S4.1, and need not to be linked in the IP backbone network again as if object UE;
S4.2 then can implement S2 communication process afterwards through the backbone network of Ad-hoc network insertion CogMes h and cellular basestation composition again if target does not exist.。
(3) beneficial effect
This invention can effectively solve tradition and connect the deficient and general not high problem of the availability of frequency spectrum of the frequency spectrum resource that runs in the cellular network.Utilize CogAd-hoc network and CogMesh network that the booster action of cellular network is realized the whole all standing that inserts the zone; And solve the problem of the communication quality difference of area of cell edge in the past and coverage hole; Simultaneously; The CogMesh network design can be taken all factors into consideration characteristics such as cognitive coverage effect and renewable energy source distribution, helps the green low-carbon transformation of cellular network.CogMesh node and CogAd-hoc node rely on its cognitive function to carry out frequency spectrum perception, utilize idle frequency band to communicate, and improve band efficiency; When the cellular network transmission pressure was excessive, CogMesh network and CogAd-hoc network played shunting action to cellular network simultaneously; And in some cellular network coverage hole or covering edge zone; The signal that Cogme sh network and Ad-hoc network more flexible will remedy this moment is not enough; Promote the communication quality of edge customer.
Description of drawings
Fig. 1 is that the CogMesh/CogAd-hoc chance is assisted formula wide area mobile communications network framework;
Fig. 2 is user's access process;
Fig. 3 is based on the process of setting up of the communication link of CogMesh node;
Fig. 4 is based on the handoff procedure between CogMesh, CogAd-hoc isomerization access network.
Embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
A kind of CogMesh/CogAd-hoc chance provided by the invention is assisted formula wide area mobile communications network framework; It is characterized in that unlimited access capability by means of cognitive radio; Assist the cellular network transmission through CogMesh node and CogAd-hoc node opportunistic, make up cognitive wide area mobile communications network framework.
It relies on the framework of cellular network, between the Hot Spot of cellular network, disposes the Mesh node with cognitive radio function, and the covering of cellular network is compensated and carries out corresponding load sharing.Wherein, these CogMesh nodes are kind base station equipments, and it is linked in the IP backbone through mobile switching centre with the normal cellular base station jointly; Simultaneously; The CogMesh node also has the ability of intelligent decision; The CogMesh node can generate the frequency spectrum resource tabulation according to the frequency spectrum cavity-pocket of the periphery that perceives; And the user of record through its access network QoS demand, and it is these information are internodal mutual and then instruct the distribution of idle frequency spectrum through different CogMesh, thus reach the user's of the multiplexing and best assurance of flexible and efficient frequency spectrum resource demand.
In addition, CogMe sh node has also kept the characteristic of Mesh network, between interconnected CogMesh node, can set up the data link of multi-hop.When IP backbone produces congested or mobile switching centre when breaking down, the CogMesh node is then initiated as required route and is attempted setting up a transmission link through the Mesh multihop path user data is transmitted.Thereby alleviated the transmission pressure of core network, and made full use of the ability of CogMesh node.
Because the CogMesh node is as a kind of base station of auxiliary deployment; Need not the emphasis of the network coverage as its deployment strategy; And can take into full account green can the energy (as wind energy, solar energy, water can etc.) distribution; Thereby make the use of CogMesh node not only help alleviating Hot Spot pressure, and help the green low-carbon transformation of network.
And blind area and border district that the CogAd-hoc node is deployed in whole Access Network as the protection node of the network coverage are to realize the seamless covering of network.Because it is relatively poor that network signal covers, and will start the Ad-hoc function in the blind area of Access Network and the user of border district, trial connects into base station network through the multihop path of the CogAd-hoc node that other node of opening the Ad-hoc function is perhaps disposed in advance.In addition, the CogAd-hoc node equally has cognitive function as the CogMesh node, can utilize idle frequency spectrum to improve high quality services as far as possible for the user; And the CogAd-hoc node also can carry out the mutual of perception information with other CogAd-hoc nodes and CogMesh node, and chooses based on interactive information and to interfere with each other minimum frequency range and for the user service is provided.
For the user service is provided because CogMesh node and CogAd-hoc node are the frequency spectrum cavity-pockets that utilizes of opportunistic, therefore the UE through CogMesh node or CogAd-hoc node access network needs the periodic situation of surveying peripheral diverse network.When peripheral network environment changes, in order to guarantee communication quality, UE will start handoff procedure.
Workflow of the present invention is following:
Under this wide area network architecture, when the terminal began to communicate, if cellular network signals is good, channel was smooth, and the terminal will be inserted in the cellular network and communicate; If can't detect cellular network signals or this moment cellular network congestion phenomenon appears; To detect whether can receive the CogMesh signal this moment; If signal is good and the CogMesh congestion condition is normal, then the CogMesh network is inserted at the terminal, is communicated by CogMe sh network assistance terminal; If this moment, the CogMesh network quality did not still reach requirement; Then starting terminal Ad-hoc function is sought proper A d-hoc network path and is arrived at the destination, and accomplishes communications.Idiographic flow is following:
1. when network is initial, the wireless environment around each CogMesh node detection, and with near cellular basestation and the neighbours CogMesh node switching loading condition separately and the peripheral spectrum utilization situation of perception.According to mutual information, each CogMesh node confirms to use the cost of different frequency bands, chooses suitable frequency band and uses to reduce the phase mutual interference.
2.UE after the start, will select suitable network to insert.UE will preferentially attempt inserting cellular network.
2.1, will for it service be provided by this cellular network if selected cellular basestation can satisfy the desired qos requirement of user;
2.2 when the signal quality of selected cellular basestation good, but because the user is more causes congested and can't satisfy its desired QoS of user, this cellular network will notify UE to open cognition module, attempt passing through the cognitive nodes access network;
2.3 cross difference and can't reach the required qos requirement of UE when the signal strength signal intensity of cellular basestation, UE will initiatively open cognition module, attempt through the cognitive nodes access network the cognitive base station of perception periphery;
3.UE after opening cognition module, the signal strength signal intensity of the CogMesh network of search periphery, when the signal strength signal intensity of CogMesh network satisfies the qos requirement of UE, UE will be linked into corresponding C ogMesh node.This GogMesh node can according to this moment network and channel communication conditions select to set up different data feedback channel links:
3.1 when IP backbone network bearing capacity was good, the CogMesh node then selected up link through mobile switching centre with user access network;
3.2 when the IP backbone network occurs congested or breaks down; The CogMesh node starts route finding process as required; Trial is sought through the internodal interconnected link of CogMesh can arrive targeted customer's passage, and utilizes this multihop path to carry out the forwarding of user data.
3.3 when the IP backbone network occurs congested or breaks down, and when not having the multi-hop link that reaches the targeted customer, the CogMesh node will notify UE unlatching CogAd-hoc function, make it can pass through CogAd-hoc node access network;
4.UE after opening the Ad-hoc function, the CogAd-hoc node of opening the UE of this function simultaneously or disposing in advance around it will be searched is attempted the multi-hop link access network through them.
4.1 connect if object UE under same Ad-hoc network, is then directly set up the communication of multi-hop, and need not to be linked into again in the IP backbone network;
4.2, then can implement the 2nd step communication process afterwards again through the backbone network of Ad-hoc network insertion CogMesh and cellular basestation composition if target does not exist.
5. in the time of still can't finding suitable communications conduit through above process UE, UE reduces service Qos requirement, carries out network insertion request flow process again according to the flow process after the step 2.
6. for the UE of access network; Occur under the congested situation at network; Network side can be notified UE change QoS grade; And UE will attempt keeping the current QoS grade according to other the feasible link paths of process selecting after the S2, and UE just changes the QoS grade repetition S2 flow process afterwards of oneself in the time can't searching out the suitable path access network.
7. because CogMesh node and CogAd-hoc node are that the service that dynamic perception periphery frequency spectrum cavity-pocket is provided is unsettled, therefore the UE through CogMesh node or CogAd-hoc node access network needs the periodic situation of surveying peripheral diverse network.When peripheral network environment changes, in order to guarantee communication quality, UE will start handoff procedure, and switching standards is selected according to the flow process after the step 2.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. mobile communication network; It is characterized in that; Hot Spot at cellular network is disposed the CogMesh node, disposes the CogAd-hoc node in the blind area of cellular network, assists the cellular network transmission by CogMesh node with cognitive function and CogAd-hoc node opportunistic.
2. the system of claim 1 is characterized in that, said CogMesh node type of being base station equipment is linked in the IP backbone through mobile switching centre.
3. the system of claim 1 is characterized in that, can set up the data link of multi-hop between the said CogMesh node; When IP backbone produces congested or mobile switching centre when breaking down, the CogMesh node is initiated as required route and is attempted setting up a transmission link through the Mesh multihop path user data is transmitted.
4. the system of claim 1 is characterized in that, blind area and border district that said CogAd-hoc node is deployed in whole Access Network as the protection node of the network coverage are to realize the seamless covering of network.
5. system as claimed in claim 5; It is characterized in that; Said CogAd-hoc node will start the Ad-hoc function in the blind area of Access Network and the user of border district, attempt connecting into base station network through the node of other unlatching Ad-hoc function or the multihop path of the preparatory CogAd-hoc node of disposing.
6. the system of claim 1; It is characterized in that; Said CogMesh node and CogAd-hoc node have cognitive function; Generate the frequency spectrum resource tabulation according to the frequency spectrum cavity-pocket of the periphery that perceives, and record is through the user's of its access network QoS demand, and frequency spectrum resource and QoS demand information is internodal alternately and then instruct the distribution of idle frequency spectrum through different CogMesh; Choose the frequency range that interferes with each other minimum and service is provided, for the user high quality services as far as possible is provided through utilizing idle frequency spectrum for the user.
7. a method of mobile communication is characterized in that, said method step is following:
S1, when network is initial, the wireless environment around each CogMesh node detection, and with near cellular basestation and the neighbours CogMesh node switching loading condition separately and the peripheral spectrum utilization situation of perception; According to mutual information, each CogMesh node confirms to use the cost of different frequency bands, chooses suitable frequency band and uses;
S2, after the UE start, the preferential access cellular network of attempting can not meet the demands as if the service quality that can't insert or cellular network provides, and then opens cognition module;
S3; UE is after opening cognition module; The signal strength signal intensity of the CogMesh network of search periphery; When the signal strength signal intensity of CogMesh network reaches the qos requirement of UE, UE will be linked into corresponding C ogMesh node, the CogMesh node can according to this moment network and channel communication conditions select to set up different data feedback channel links; If when the communication link of process CogMesh node can not satisfy the qos requirement of UE, the CogMesh node then notified UE to open the Ad-hoc function;
S4, after UE opened the Ad-hoc function, the CogAd-hoc node of opening the UE of this function simultaneously or disposing in advance around it will be searched was attempted the multi-hop link access network through them;
S5, in the time of still can't finding suitable communications conduit as if UE, UE reduces service Qos requirement, jumps to S2 and carries out network insertion request flow process again;
S6; For the UE of access network; Occur under the congested situation at network; Network side can be notified UE change QoS grade, and UE will attempt keeping the current QoS grade according to other the feasible link paths of process selecting after the S2, and UE just changes the QoS grade repetition S2 flow process afterwards of oneself in the time can't searching out the suitable path access network; S7; UE through CogMesh node or CogAd-hoc node access network needs the periodic situation of surveying peripheral diverse network, when peripheral network environment changes, in order to guarantee communication quality; UE will start handoff procedure, and switching standards is selected according to the flow process after the S2.
8. method as claimed in claim 7 is characterized in that, said step S2 further comprises:
S2.1 will provide service for it by this cellular network if selected cellular basestation can satisfy the desired qos requirement of user;
S2.2 when the signal quality of selected cellular basestation good, but because the user is more causes congested and can't satisfy its desired QoS of user, this cellular network will notify UE to open cognition module, attempt passing through the cognitive nodes access network;
S2.3 crosses difference and can't reach the required qos requirement of UE when the signal strength signal intensity of cellular basestation, and UE will initiatively open cognition module, and attempt through the cognitive nodes access network the cognitive base station of perception periphery.
9. method as claimed in claim 7 is characterized in that, said step S3 further comprises:
S3.1 is when IP backbone network bearing capacity is good, and the CogMesh node then selects up link through mobile switching centre with user access network;
When S3.2 occurs congested or breaks down when the IP backbone network; The CogMesh node starts route finding process as required; Trial is sought through the internodal interconnected link of CogMesh can arrive targeted customer's passage, and utilizes this multihop path to carry out the forwarding of user data;
S3.3 occurs congested or breaks down when the IP backbone network, and when not having the multi-hop link that reaches the targeted customer, the CogMesh node will notify UE unlatching CogAd-hoc function, make it can pass through CogAd-hoc node access network.
10. method as claimed in claim 7 is characterized in that, said step S4 further comprises:
Under same Ad-hoc network, the communication of then directly setting up multi-hop connects S4.1, and need not to be linked in the IP backbone network again as if object UE;
S4.2 then can implement S2 communication process afterwards through the backbone network of Ad-hoc network insertion CogMesh and cellular basestation composition again if target does not exist.
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