CN102711118B - 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 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, the technology such as ubiquitous network, Internet of Things is flourish, follow the proposition of the concept in the wisdom earth, wisdom city, and the intelligent city's construction advancing in world wide, especially entire society's life is shifted onto ultimate attainment to the demand of Construction of Information Network, the every profession and trade of social life is longed for information and mechanics of communication industry, and numerous and confused hope can realize the various communications that outmatch full internet such as traffic, tourism, government's office by information network.Broadband wireless communication technique is constantly weeded out the old and bring forth the new, but for cordless communication network technology, bottleneck is frequency spectrum resource forever.The communications industry was perplexed by the contradiction between limited frequency spectrum resource and growing demand for services in the last few years always, contradiction between the heterogeneous network of network insertion, fusion demand and the current isolated island formula causing due to wireless network thought, must be by the innovation of network design thought is solved.Only have the current fixed frequency spectrum distribution policy of thorough change, part even all adopts 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 to undoubtedly the development and construction of wireless network.Covering area overlapping, communication protocol be inconsistent, lack unified service management and control network situation, not only do not make network ubiquitous, isomery highlight its advantage, makes on the contrary user face more complicated network environment.We think, the prospect of future communications network is a network schemer ubiquitous, isomery merges, multi-access mode is also deposited, multi-node collaborative work, support Seamless Mobile characteristic in various degree, it is again an intelligentized wireless communication system simultaneously, sensing external environment at any time, and the change with response and dynamic self-adapting environment and operation according to current network condition self-configuring.
Heterogeneous wireless Mesh network, as the important channel of multiple network fusion, is just being made great efforts the fusion of gradual perfection and multiple Radio Transmission Technology at present, and being intended to provides more convenient and reliable network service for user.But 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 affect the effect of the network integration greatly.
Cognitive radio technology is as the important means of obtaining wireless transmission physical layer information, can automatically detect radio environment, reconfigure Internet resources, adjust mode of operation and transformation 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 to potential dramatic change.Cognitive radio networks has intelligent characteristic, seamless fusion heterogeneous network, becomes rapidly the focus of domestic and international Ge great standardization body, research institution and a large amount of focus of attentions by joint resource management with advantages such as maximization network overall performances with it.The cognitive ability that adopts cognitive radio, can make in theory limited frequency spectrum resource support the wireless access service growing with each passing day becomes possibility.
Cognitive radio networks is not only a kind of not science and unbalanced substantive solution of frequency spectrum use of current spectrum allocation may of processing, and contribute to promote fusion or the interoperability of different networks, for the self-organizing network of constructing following wireless cognition network and possessing perception self-adaption characteristic provides basic guarantee.
The CogMesh node with cognitive features that cognitive techniques is applied to wireless Mesh netword and form can better be brought into play the advantage of two kinds of technology, to solve the frequency spectrum anxiety and the unequal problem of load that occur in current wireless communication process.In addition, the CogAd-hoc node by being aided with cognitive function solves the problem of network blind area of coverage, and then realizes the seamless communication network that high quality communication service is provided.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is to provide 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, disposes CogMesh node at the Hot Spot of cellular network, disposes CogAd-hoc node in the blind area of cellular network, assists cellular network transmission by CogMesh node and the CogAd-hoc node chance formula with cognitive function.
Wherein, described CogMesh node is class base station equipment, is linked in IP backbone by mobile switching centre.
Wherein, between described CogMesh node, can set up the data link of multi-hop; In the time that IP backbone produces congested or mobile switching centre and breaks down, CogMesh node is initiated as required route and is attempted setting up a transmission link by Mesh multihop path user data is forwarded.
Wherein, described CogAd-hoc node is deployed in the blind area of whole Access Network and border district to realize the seamless coverage of network as the protection node of the network coverage.
Wherein, described CogAd-hoc node in the blind area of Access Network and the user of border district will start Ad-hoc function, attempt opening the node of Ad-hoc function or the multihop path of the pre-CogAd-hoc node of disposing connects into base station network by other.
Wherein, described CogMesh node and CogAd-hoc node have cognitive function, generate frequency spectrum resource list according to the frequency spectrum cavity-pocket of the periphery perceiving, and record is by the user's of its access network QoS demand, and frequency spectrum resource and QoS demand information is internodal mutual and then instruct the distribution of idle frequency spectrum by different CogMesh, choose and interfere with each other minimum frequency range and provide service for user, by utilizing idle frequency spectrum to provide high-quality as far as possible service for user.
A kind of method of mobile communication, described method step is as follows:
S1, when network is initial, each CogMesh node detects wireless environment around, and with near cellular basestation and neighbours CogMesh node switching loading condition separately and the periphery spectrum utilization situation of perception; According to mutual information, each CogMesh node determination uses the cost of different frequency bands, chooses suitable frequency band and uses;
S2, after UE start, preferentially attempts access cellular network, if cannot access or service quality that cellular network provides can not meet the demands, opens cognition module;
S3, UE is opening after cognition module, the signal strength signal intensity of the CogMesh network of search periphery, in the time that the signal strength signal intensity of CogMesh network reaches the qos requirement of UE, UE will be linked into corresponding CogMesh node, and CogMesh node can be set up different data feedback channel links according to the now communication conditions selection of network and channel; If can not meet the qos requirement of UE through the communication link of CogMesh node time, CogMesh node notifies UE to open Ad-hoc function;
S4, UE opens after Ad-hoc function, and it will search the CogAd-hoc node of opening the UE of this function around simultaneously or disposing in advance, attempts by their multi-hop link access network;
S5, if when UE still cannot find suitable communications conduit, UE reduces service Qos requirement, jumps to S2 and re-starts network insertion request flow process;
S6, for the UE of access network, occur congested in the situation that at network, network side can be notified UE change QoS grade, and UE keeps current QoS grade according to other the feasible link paths of process selecting after S2 by attempting, the QoS grade repetition S2 that UE just change oneself in the time cannot searching out suitable path access network flow process afterwards; S7, need periodically to survey the situation of periphery diverse network by the UE of CogMesh node or CogAd-hoc node access network, in the time that periphery network environment changes, in order to ensure communication quality, UE will start handoff procedure, and switching standards is selected according to the flow process after S2.
Wherein, described step S2 further comprises:
If the selected cellular basestation of S2.1 can meet the desired qos requirement of user, will provide service for it by this cellular network;
S2.2 when the signal quality of selected cellular basestation good, but cause congested because user is more and cannot meet its desired QoS of user, this cellular network will notify UE to open cognition module, attempt passing through cognitive nodes access network;
S2.3 crosses poor and cannot 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 by cognitive nodes access network the cognitive base station of perception periphery.
Wherein, described step S3 further comprises:
S3.1 is in the time that IP backbone network bearing capacity is good, and CogMesh node selects up link by mobile switching centre by user access network;
S3.2 is in the time that the appearance of IP backbone network is congested or break down, CogMesh node starts route finding process as required, attempt finding and can arriving targeted customer's passage by the internodal interconnected link of CogMesh, and utilize this multihop path to carry out the forwarding of user data;
S3.3 occurs congestedly or break down when IP backbone network, and while there is not the multi-hop link that reaches targeted customer, CogMesh node will notify UE unlatching CogAd-hoc function, can pass through CogAd-hoc node access network.
Wherein, described step S4 further comprises:
If S4.1 object UE under same Ad-hoc network, the communication connection of directly setting up multi-hop, and without being linked into again in IP backbone network;
If S4.2 target does not exist, the backbone network that can form by Ad-hoc network insertion CogMes h and cellular basestation, then implement the communication process after S2.。
(3) beneficial effect
This invention can effectively solve tradition and connect the frequency spectrum resource scarcity and the general not high problem of the availability of frequency spectrum that in cellular network, run into.Utilize CogAd-hoc network and CogMesh network the booster action of cellular network to be realized to all standing in whole access region, and solve the poor problem of communication quality of the area of cell edge in the past and coverage hole, simultaneously, CogMesh network design can consider the characteristic such as cognitive coverage effect and renewable energy source distribution, contributes to 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; In the time that cellular network transmission pressure is excessive, CogMesh network and CogAd-hoc network play shunting action to cellular network simultaneously; And in some cellular network coverage hole or covering edge zone; The flexibility of Cogme sh network and Ad-hoc network is by the signal deficiency making up now; Promote the communication quality of edge customer.
Brief description of the drawings
Fig. 1 is that CogMesh/CogAd-hoc chance is assisted formula wide area mobile communications network framework;
Fig. 2 is user's access process;
Fig. 3 is the process of establishing of the communication link based on CogMesh node;
The handoff procedure of Fig. 4 based between CogMesh, CogAd-hoc isomerization access network.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the 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 the unlimited access capability by means of cognitive radio, assist cellular network transmission by CogMesh node and CogAd-hoc node chance formula, build cognitive wide area mobile communications network framework.
It relies on the framework of cellular network, between the Hot Spot of cellular network, disposes and has the Mesh node of 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 and normal cellular base station are linked in IP backbone by mobile switching centre jointly; Simultaneously, CogMesh node also has the ability of intelligent decision, CogMesh node can generate frequency spectrum resource list according to the frequency spectrum cavity-pocket of the periphery perceiving, and record is by the user's of its access network QoS demand, and it is internodal mutual and then instruct the distribution of idle frequency spectrum that these information exchanges are crossed to different CogMesh, thereby reach the user's of the multiplexing and best guarantee of flexible and efficient frequency spectrum resource demand.
In addition, CogMe sh node has also retained the characteristic of Mesh network, can set up the data link of multi-hop between interconnected CogMesh node.In the time that IP backbone produces congested or mobile switching centre and breaks down, CogMesh node is initiated as required route and is attempted setting up a transmission link by Mesh multihop path user data is forwarded.Thereby alleviate the transmission pressure of core network, and taken full advantage of the ability of CogMesh node.
Because CogMesh node is as a kind of base station of auxiliary deployment, without the emphasis using 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 the use that makes CogMesh node is not only conducive to alleviate Hot Spot pressure, and be conducive to the green low-carbon transformation of network.
And CogAd-hoc node is deployed in the blind area of whole Access Network and border district to realize the seamless coverage of network as the protection node of the network coverage.Due to network signal cover poor, in the blind area of Access Network and the user of border district will start Ad-hoc function, the multihop path of attempting opening by other node of Ad-hoc function or the CogAd-hoc node of pre-deployment connects into base station network.In addition, CogAd-hoc node has cognitive function as CogMesh node, can utilize idle frequency spectrum for the high-quality as far as possible service of user's raising; And CogAd-hoc node also can carry out the mutual of perception information with other CogAd-hoc nodes and CogMesh node, and choose and interfere with each other minimum frequency range and provide service for user based on interactive information.
Due to CogMesh node and CogAd-hoc node be chance formula utilize frequency spectrum cavity-pocket for user provides service, therefore need periodically to survey the situation of periphery diverse network by the UE of CogMesh node or CogAd-hoc node access network.In the time that periphery network environment changes, in order to ensure communication quality, UE will start handoff procedure.
Workflow of the present invention is as follows:
Under this wide area network architecture, when terminal starts to communicate, if cellular network signals is good, channel smoothness, terminal will communicate in access cellular network; If cannot detect cellular network signals or now cellular network there is congestion phenomenon, now whether detection can be received to CogMesh signal, if signal is good and CogMesh congestion condition is normal, terminal access CogMesh network, is communicated by CogMe sh network assistance terminal; If now CogMesh network quality does not still reach requirement; Terminal starts Ad-hoc function, finds suitable Ad-hoc network path and arrives at the destination, and completes communications.Idiographic flow is as follows:
1., when network is initial, each CogMesh node detects wireless environment around, and with near cellular basestation and neighbours CogMesh node switching loading condition separately and the periphery spectrum utilization situation of perception.According to mutual information, each CogMesh node determination uses the cost of different frequency bands, chooses suitable frequency band and uses to reduce phase mutual interference.
After 2.UE start, suitable network insertion will be selected.UE will preferentially attempt accessing cellular network.
If 2.1 selected cellular basestations can meet the desired qos requirement of user, will provide service for it by this cellular network;
2.2 when the signal quality of selected cellular basestation good, but cause congested because user is more and cannot meet its desired QoS of user, this cellular network will notify UE to open cognition module, attempt passing through cognitive nodes access network;
2.3 cross poor and cannot 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 by cognitive nodes access network the cognitive base station of perception periphery;
3.UE is opening after cognition module, the signal strength signal intensity of the CogMesh network of search periphery, and in the time that the signal strength signal intensity of CogMesh network meets the qos requirement of UE, UE will be linked into corresponding CogMesh node.This GogMesh node can be set up different data feedback channel links according to the now communication conditions selection of network and channel:
3.1 in the time that IP backbone network bearing capacity is good, and CogMesh node selects up link by mobile switching centre by user access network;
3.2 in the time that the appearance of IP backbone network is congested or break down, CogMesh node starts route finding process as required, attempt finding and can arriving targeted customer's passage by the internodal interconnected link of CogMesh, and utilize this multihop path to carry out the forwarding of user data.
3.3 occur congestedly or break down when IP backbone network, and while there is not the multi-hop link that reaches targeted customer, CogMesh node will notify UE unlatching CogAd-hoc function, can pass through CogAd-hoc node access network;
4.UE opens after Ad-hoc function, and it,, by search the CogAd-hoc node of opening the UE of this function around or disposing in advance simultaneously, is attempted by their multi-hop link access network.
If 4.1 object UE under same Ad-hoc network, the communication connection of directly setting up multi-hop, and without being linked into again in IP backbone network;
If 4.2 targets do not exist, the backbone network that can form by Ad-hoc network insertion CogMesh and cellular basestation, then implement the communication process after the 2nd step.
5., still cannot find suitable communications conduit through above process UE time, UE reduces service Qos requirement, re-starts network insertion request flow process according to the flow process after step 2.
6. for the UE of access network, occur congested in the situation that at network, network side can be notified UE change QoS grade, and UE keeps current QoS grade according to other the feasible link paths of process selecting after S2 by attempting, the QoS grade repetition S2 that UE just change oneself in the time cannot searching out suitable path access network flow process afterwards.
7. because CogMesh node and CogAd-hoc node are that the service that dynamic sensing periphery frequency spectrum cavity-pocket provides is unsettled, therefore need periodically to survey the situation of periphery diverse network by the UE of CogMesh node or CogAd-hoc node access network.In the time that periphery network environment changes, in order to ensure communication quality, UE will start handoff procedure, and switching standards is selected according to the flow process after step 2.
Above execution mode is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes 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 (4)
1. a method of mobile communication, it is characterized in that, Hot Spot at cellular network is disposed CogMesh node, CogAd-hoc node is disposed in blind area at cellular network, assist cellular network transmission by CogMesh node and the CogAd-hoc node chance formula with cognitive function, described method step is as follows:
S1, when network is initial, each CogMesh node detects wireless environment around, and with near cellular basestation and neighbours CogMesh node switching loading condition separately and the periphery spectrum utilization situation of perception; According to mutual information, each CogMesh node determination uses the cost of different frequency bands, chooses suitable frequency band and uses;
S2, after UE start, preferentially attempts access cellular network, if cannot access or service quality that cellular network provides can not meet the demands, opens cognition module;
S3, UE is opening after cognition module, the signal strength signal intensity of the CogMesh network of search periphery, in the time that the signal strength signal intensity of CogMesh network reaches the qos requirement of UE, UE will be linked into corresponding CogMesh node, and CogMesh node can be set up different data feedback channel links according to the now communication conditions selection of network and channel; If can not meet the qos requirement of UE through the communication link of CogMesh node time, CogMesh node notifies UE to open Ad-hoc function;
S4, UE opens after Ad-hoc function, and it will search the CogAd-hoc node of opening the UE of this function around simultaneously or disposing in advance, attempts by their multi-hop link access network;
S5, if when UE still cannot find suitable communications conduit, UE reduces service Qos requirement, jumps to S2 and re-starts network insertion request flow process;
S6, for the UE of access network, occur congested in the situation that at network, network side can be notified UE change QoS grade, and UE keeps current QoS grade according to other the feasible link paths of process selecting after S2 by attempting, the QoS grade repetition S2 that UE just change oneself in the time cannot searching out suitable path access network flow process afterwards; S7, need periodically to survey the situation of periphery diverse network by the UE of CogMesh node or CogAd-hoc node access network, in the time that periphery network environment changes, in order to ensure communication quality, UE will start handoff procedure, and switching standards is selected according to the flow process after S2.
2. the method for claim 1, is characterized in that, described step S2 further comprises:
If the selected cellular basestation of S2.1 can meet the desired qos requirement of user, will provide service for it by this cellular network;
S2.2 when the signal quality of selected cellular basestation good, but cause congested because user is more and cannot meet its desired QoS of user, this cellular network will notify UE to open cognition module, attempt passing through cognitive nodes access network;
S2.3 crosses poor and cannot 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 by cognitive nodes access network the cognitive base station of perception periphery.
3. the method for claim 1, is characterized in that, described step S3 further comprises:
S3.1 is in the time that IP backbone network bearing capacity is good, and CogMesh node selects up link by mobile switching centre by user access network;
S3.2 is in the time that the appearance of IP backbone network is congested or break down, CogMesh node starts route finding process as required, attempt finding and can arriving targeted customer's passage by the internodal interconnected link of CogMesh, and utilize this multihop path to carry out the forwarding of user data;
S3.3 occurs congestedly or break down when IP backbone network, and while there is not the multi-hop link that reaches targeted customer, CogMesh node will notify UE unlatching CogAd-hoc function, can pass through CogAd-hoc node access network.
4. the method for claim 1, is characterized in that, described step S4 further comprises:
If S4.1 object UE under same Ad-hoc network, the communication connection of directly setting up multi-hop, and without being linked into again in IP backbone network;
If S4.2 target does not exist, the backbone network that can form by Ad-hoc network insertion CogMesh and cellular basestation, then implement the communication process after S2.
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| CN104954176B (en) * | 2015-05-27 | 2019-03-22 | 北京工业大学 | For information centre's method for managing resource of environment sensing in multi-hop cellular network framework |
| CN109246677A (en) * | 2017-05-31 | 2019-01-18 | 深圳市中兴微电子技术有限公司 | Wireless communication system and wireless communications method |
| JP2022509784A (en) * | 2018-11-28 | 2022-01-24 | 広州極飛科技股▲ふん▼有限公司 | Unmanned aerial vehicle communication system and method |
| CN112996070B (en) * | 2021-03-04 | 2023-03-24 | 网络通信与安全紫金山实验室 | Data transmission method and system based on distributed non-cellular network |
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