CN105933940B - Seamless handover method based on collaboration base station sub-clustering in super-intensive network - Google Patents
Seamless handover method based on collaboration base station sub-clustering in super-intensive network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
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Abstract
The present invention relates to the seamless handover methods based on collaboration base station sub-clustering in a kind of super-intensive network.Collaboration sub-clustering is carried out to the small base station of super-intensive deployment first；Overlapping sub-clustering is carried out, to obtain overlapping cluster node；When user moves in cluster, using serving BS group dynamic self refresh method, switching demand in user's cluster is completed；When user carries out across cluster movement, using switching early warning mechanism, pretreatment is switched in advance, to reduce switching time, handoff procedure is then executed, is finally completed seamless switching.The present invention is to cooperate with base station sub-clustering and switching early warning as point of penetration, according to the situation of movement of mobile subscriber: moving in cluster, moved between cluster, using different switchover policy, carry out efficient cell switching, reduce switching delay, reduce handover failure rate, promotes the experience of user's seamless switching.
Description
Technical field
The present invention relates to the seamless handover methods based on collaboration base station sub-clustering in a kind of super-intensive network.
Background technique
Coming 10 years communication data rate is expected to realize 1000 times of growth.Increase to cope with this lasting rapid data
It is long, meet the user experience demand of people, 4G network is pushed to be begun with by extensively covering Deep mulch of marching toward, major mobile operator
The planning ground small base station of large scale deployment.Super-intensive cell deployment has been acknowledged as an important component of 5G mobile communication,
The basic thought of super-intensive cell deployment is the physical distance for shortening transmitting terminal and receiving end, to promote the property of terminal user
Energy.
It is important to note, however, that being covered in the cell mobile communication systems of super-intensive deployment by multiple cellular cells
The overlay area of single macro base station in the area Yuan great system, the covering radius of each cellular cell greatly reduces, but the mobility of user
So that single subdistrict can not provide required continuous service for mobile subscriber.Simultaneously as user carries out height between different community
Speed is mobile, can generate frequent switching, and cutting off rate, the delay etc. generated in handoff procedure will affect the communication for service matter of user
Amount, particularly with multimedia application.Therefore, using efficient handover mechanism, reduce mobile subscriber's switching off between the base stations
Words rate and delay are the key that improve future wireless system service experience.
The patent of Chinese patent CN201410797186.8 proposes in a kind of ultra dense set network and reduces handover failure
Method can be realized adaptive adjustment by calculating handover failure number and number of success in given time length of window and cut
Parameter is changed, effectively reduces handover failure rate when UE passes through the region of Pico Cell dense deployment, and is able to achieve reduction switching
Failure rate and the balance for reducing table tennis rate.The patent of Chinese patent CN201010268238.4 proposes a kind of based on collaboration diversity
The seamless handover method of technology extends the call duration time of mobile terminal and source base station, reduces and cut using collaboration diversity mechanism
Out of service time during changing can effectively improve system performance.The patent of Chinese patent CN201510334856.7 proposes
Based on the prediction adjustable switching method of thresholding hysteresis margin in a kind of super-intensive network, in the invention, according to the speed of equipment
Degree adjusts corresponding handoff threshold hysteresis margin, completes equipment in the switching flow of minizone.
Periodical Global Communications Conference (GLOBECOM), the Local that 2013IEEE is published
Mobility Anchoring for Seamless Handover in Coordinated Small Cells mono- the article pointed out
User will undergo frequent switching in moving process, this not only causes the signalling loads of core network, also to influence user's
Performance of handoffs proposes and provides a user switching service using the method for cluster sliding, while having studied anchor point in static honeycomb cluster
Position moves down technology, to reduce handover delay, improves customer service experience.
By analyzing the above-mentioned prior art it is found that reducing handover delay, domestic and foreign scholars master to solve to improve switching efficiency
It to be improved in terms of two: first is that trying the time overhead of reduction detection process；Second is that pre-decision switching time, guarantees
Handover success rate.But current mobile handoff improved method has very high dependence to moving projection algorithm, and algorithm is excessively
Complexity will lead to switching time decision inaccuracy, it is difficult to realize seamless switching, more be mainly, switching method is not seldom at present
The seamless switching demand for experience of the mobile communication subscriber come under ultra dense deployed environment is comprehensively considered.
Summary of the invention
The technical problem to be solved in the present invention is to provide in a kind of super-intensive network based on collaboration base station sub-clustering without seaming and cutting
Method is changed, to cooperate with base station sub-clustering and switching early warning as point of penetration, according to the situation of movement of mobile subscriber: moving in cluster, between cluster
It is mobile, using different switchover policy, efficient cell switching is carried out, reduces switching delay, reduce handover failure rate, promoted and used
The experience of family seamless switching.
It is of the existing technology in order to solve the problems, such as, the technical solution adopted by the present invention is that:
A kind of seamless handover method based on collaboration base station sub-clustering in super-intensive network, comprising:
Step a carries out collaboration sub-clustering to the small base station of super-intensive deployment first；
Step b carries out overlapping sub-clustering, to obtain overlapping cluster node；
Step c, using serving BS group dynamic self refresh method, completes user's cluster inscribe when user moves in cluster
Change demand；When user carries out across cluster movement, using switching early warning mechanism, pretreatment is switched in advance, it is quasi- to reduce switching
The standby time, handoff procedure is then executed, seamless switching is finally completed.
Compared with prior art, the seamless handover method based on collaboration base station sub-clustering in super-intensive network of the invention,
Beneficial effect is shown:
Since the quality of switchover policy will directly affect the performance of whole system, how to establish an efficient, spirit
Seamless handover mechanism that is living, being easy to analyze, is super-intensive networking one of the critical issue to be solved.The present invention is to cooperate with base station
Being overlapped sub-clustering and switching early warning processing is point of penetration, on the basis of cooperateing with the modeling of base station cluster, according to the mobile feelings of mobile subscriber
Condition, using different switchover policy: when moving in cluster, servicing group selection method using dynamic mechanism, utilize money with better
Source is mobile subscriber's service；When being moved between cluster, on the basis of based on switching early warning mechanism, using efficiently across cluster switching plan
Slightly, it is finally completed seamless switching process.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawing:
Fig. 1 is the Technology Roadmap of the seamless handover method based on collaboration base station sub-clustering in super-intensive network.
Fig. 2 is user uiThe schematic diagram of moving direction.
Fig. 3 is collaboration base station sub-clustering result schematic diagram.
Fig. 4 is that process schematic is realized in overlapping sub-clustering.
Fig. 5 is SS dynamic self refresh process schematic when moving in cluster.
Specific embodiment
The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to be used to explain the present invention, and cannot understand
For limitation of the present invention.
The present invention proposes the seamless handover method based on collaboration base station sub-clustering, and core concept and technology path are as schemed
Shown in 1, during realizing seamless switching, to reduce switching times, the small base station of super-intensive deployment is cooperateed with first
Sub-clustering, and overlapping sub-clustering is carried out, to obtain overlapping cluster node.When user moves in cluster, certainly using serving BS group dynamic
Update method completes user and switches demand；When user carries out across cluster movement, using switching early warning mechanism, switch in advance
Then pretreatment executes handoff procedure, is finally completed seamless switching to reduce switching time.Particular technique route is as follows:
(1) base station sub-clustering is cooperateed with
1) base station clustering process is cooperateed with
In practical communication, two user u of base station i and base station j corresponding with serviceiAnd ujIf base station i comes from user uj's
Interference components are bigger, and base station i more thinks and j cooperative cooperating.Assuming that DoC (i, j) indicates the collaborative e-commerce of base station i to base station j, then it can be with
It is measured with cooperative cooperating mutual between base station to dry make an uproar than gain of both sides' bring signal, it may be assumed that
WhereinIt indicates to receive signal-to-noise ratio when base station i cooperates with j.
Receive signal-to-noise ratio when cooperation non-for base station i and j.
DoC (i, j) is bigger, and the desired value that base station i cooperates with j is bigger.Similarly, base station j and i can be indicated with DoC (j, i)
The desired value of cooperation.
Main thought based on the sub-clustering of collaborative e-commerce base station is: biggish base it is expected in cooperation in high density home base station network
Station is divided into same cluster.If Ω is the set of N number of small base station composition of random placement in network, ψiIt is jumped for the one of base station i adjacent
The set that base station forms in area's list, | ψi| one for base station i jumps the degree of neighboring cell list, PiIndicate the signal power that base station i receives
Intensity summation.
Cooperate with base station clustering process as follows:
A) a jump neighboring cell list is established for each base station i | ψi|, and calculate the degree of the neighboring cell list at the station | ψi|。
B) it is selected from Ω and meets condition i*=argmax | ψi| base station i*As the leader cluster node of base station cluster C1, simultaneously
As the control centre of the cluster, if there is multiple base stations for meeting condition, then therefrom selection meets condition i*'=arg maxBase station i*'As leader cluster node.
If c) ψiIt is not sky, then from ψiIn select the cluster member for meeting the base station j of formula (1) as C1.Otherwise, it is directly entered
Step d).
D) base station in cluster C1 is gone to from Ω in set, i.e. Ω '=Ω-C1 updates in set of computations Ω ' | ψi'| and
E) step a)-d is repeated), until Ω is sky.
2) it is overlapped sub-clustering
Mobile subscriber uiWhen mobile to target BS cluster C2 from base station cluster C1, it is overlapped cluster node c2iTo sense use at first
Family uiExisting base station, this also means that mobile subscriber uiC2 will be switched to from C1.Therefore, using effective overlapping sub-clustering
Method carries out overlapping sub-clustering, obtains overlapping cluster node, is the premise for switching over early warning.
The case where for isolated sub-clustering, the present invention utilizes the boundary node of sub-clustering to the hop neighbor other than its affiliated sub-clustering
Node sends inquiry request, if the boundary node of adjacent sub-clustering receives inquiry request, there are two or more sides
Two adjacent base station sub-clusterings are carried out boundary fusion according to neighbor node by boundary's node neighbor node each other, while will be adjacent each other
The boundary node in residence is as overlapping cluster node.
(2) seamless switching process
1) switchover policy in cluster
When user moves in cluster, the information such as load of the signal power and serving BS that are received according to user, selection
Initial service group of base stations of the base station as user for meeting condition, with the movement of user, it is current that dynamic selection meets user
The base station of demand for services is added in dynamic Service group of base stations, and deletes the base station for being unsatisfactory for demand for services, preferably to utilize
Resource is user service, and user is made to feel to have been at the center of a virtual big base station, and user does not need to carry out control plane
Switching.Serving BS group (SS) Dynamic selection processes are specific as follows:
A) user u is calculatediThe signal power of each base station in the cluster C1 of base station is received, and is ranked up according to size；
B) leader cluster node C1LSelection signal performance number is biggish and is less than K base station of load threshold as user ui's
Initial service group of base stations
C) with user uiMovement, willIn base station c1iBase station c1 adjacent theretojIt compares, if signal power
Intensity is less than c1j, then c1jIt is added toIn, and delete c1i；
2) switchover policy between cluster
1. the condition of triggering switching early warning
User u in the cluster C1 of base stationiWhen mobile, as the overlapping cluster node c2 in C2 and C1iSense ui, i.e. uiIt is in c2i
Signal cover in (use ui∈C2iIndicate), if it is possible to determine uiIt is to c2iThe target base clusters C2 at place covers model
Movement is enclosed, starting switching early warning switches between cluster and prepares.Therefore, it is overlapped cluster node c2iSense ui, and determine uiIt is moved to C2
It is dynamic, it is the condition of triggering switching early warning.
It is given below and determines uiThe condition mobile to C2:
As shown in Fig. 2, working as mobile subscriber uiWhen the direction of motion is in a-quadrant, it is believed that the user moves to target BS cluster C2
It is dynamic, it usesTo indicate.
From the foregoing, it will be observed that the condition of triggering switching early warning may be expressed as:
2. switch step between cluster
A) user uiIn across cluster moving process, user u is detectediSituation of movement, if meeting formula (2), starting switching is pre-
It is alert, start pre-switch, execute step b)-c), otherwise it is assumed that user uiIt is moved in cluster, continues to execute switchover policy in cluster；
B) user uiMessage is sent to source base station cluster C1, the mark of the C2 of cluster containing target BS, informs that it may be moved in message
Move C2；
C) after C1 receives message, by the leader cluster node C1 in C1LTo the leader cluster node C2 of C2LSend pre-switch request
(PRQ)；Leader cluster node C2 in C2LIt is user u after receiving PRQiReserved switchable resource；
When d) meeting switching execution condition, by the leader cluster node C1 in C1LTo the leader cluster node C2 of C2LSend switching request
(RQ)；
E) leader cluster node C2LAfter receiving RQ, according to reserved switchable resource situation, to C1LIt sends and replys confirmation request Ack；
F) leader cluster node C1LAfter receiving Ack, execution is switched over.
Seamless handover method based on collaboration base station cluster in the present invention is applied to the communication network of super-intensive deployment below
In, please with reference to the switching route map of Fig. 1, to introduce the realization process of seamless switching.
1) embodiment condition
In emulation dense deployment scene, 20 small base station random placement is in 50 × 50m, and M user is uniformly distributed, ψiFor
The one of base station i jumps the set of base station composition in neighboring cell list, | ψi| one for base station i jumps the degree of neighboring cell list, PiIndicate base station i
The signal power strength summation of receiving.
2) base station sub-clustering is cooperateed with
Using the collaboration base station clustering method in technical solution, the sub-clustering result of generation as shown in Figure 3, can be seen by Fig. 3
Out, cluster C1 and cluster C2, C3 have lap, can be using the node of lap as overlapping cluster node；And cluster C2 and cluster C3 without
Lap, it is therefore desirable to overlapping sub-clustering is carried out, to obtain overlapping cluster node.
3) it is overlapped sub-clustering
Step 1: non-overlapping cluster node between cluster C2 and C3 finds respective distance most using boundary search algorithm respectively
Boundary node that is remote and possessing neighbor node in adjacent sub-clustering.
Step 2: imputation method obtains C21,C22For cluster C2 boundary node, inquiry request is sent to cluster C3 respectively, if C31, C32
It is accordingly responded, then (C21,C31) and (C22,C32) neighbours' boundary node each other.
Step 3: boundary being carried out to cluster C2 and C3 using neighbours' boundary node and is merged, and by { C21,C22, C31, C32Conduct
It is overlapped cluster node.
Above-mentioned overlapping clustering process, as shown in Figure 4:
4) seamless switching realizes process
Step 1: group of base stations dynamic self refresh method is serviced in cluster
As mobile subscriber uiWhen moving in cluster C1, selection meets ui3 base stations of demand, as uiInitial service base
It stands group, with uiMovement, using serving BS group dynamic self refresh method, to service uiGroup of base stations carry out real-time update, more
New process is as shown in Figure 5.
Step 2: switching between cluster and realize
User u in the cluster C1 of base stationiWhen mobile to base station cluster C2, as the overlapping cluster node c2 in C2 and C1iSense ui,
Mean uiAcross cluster movement will be carried out, switchover policy between following cluster is executed:
A) user uiIn across cluster moving process, user u is detectediSituation of movement, if meeting formula (2), starting switching is pre-
It is alert, execute step b)-d), otherwise it is assumed that user uiIt is moved in cluster, executes service group self refresh strategy in base station in cluster；
B) user uiMessage is sent to source base station cluster C1, the mark of the C2 of cluster containing target BS, informs that it may be moved in message
Move C2.
C) after C1 receives information, by the leader cluster node C1 in C1LTo the leader cluster node C2 of C2LSend pre-switch request
(PRQ)；
D) the leader cluster node C2 in C2LAfter receiving PRQ, public cluster node C2 is first looked at1And C22Node accommodate situation,
Such as without departing from maximum load threshold value, as the destination node of pre-switch；
When e) meeting switching execution condition, by the leader cluster node C1 in C1LTo the leader cluster node C2 of C2LSend switching request
(RQ)；
E) leader cluster node C2LAfter receiving RQ, according to reserved switchable resource situation, to C1LIt sends and replys confirmation request Ack；
F) leader cluster node C1LAfter receiving Ack, upper level control centre is informed, by uiTransfer C2 toLIt is controlled, is cut
Execution is changed, after completing switching, C1LNullify u in itself control listiRelevant information.
The present invention carries out overlapping sub-clustering to collaboration base station cluster, is adjudicated by the overlapping cluster node combination moving direction of acquisition,
Realize mobile handoff early warning, and provide triggering switching early warning condition: overlapping cluster node sense mobile subscriber and the user to
Target cluster is mobile.To cooperate with base station sub-clustering and switching early warning as point of penetration, according to the situation of movement needle of mobile subscriber, difference is taken
Switchover policy: when being moved in cluster, using base station service group dynamic self refresh method realize user switch demand；It is moved between cluster
When, on the basis of switching early warning, the method handled using pre-switch realizes seamless switching between cluster.
Claims (1)
1. the seamless handover method based on collaboration base station sub-clustering in a kind of super-intensive network, comprising:
Step a carries out collaboration sub-clustering to the small base station of super-intensive deployment first；
Cooperateing with sub-clustering, detailed process is as follows:
In practical communication, two user u of base station i and base station j corresponding with serviceiAnd ujIf base station i comes from user ujInterference
Component is bigger, and base station i more thinks and j cooperative cooperating；Assuming that DoC (i, j) indicates the collaborative e-commerce of base station i to base station j, then base can be used
Mutual cooperative cooperating is measured to dry make an uproar than gain of both sides' bring signal between standing, it may be assumed that
WhereinIt indicates to receive signal-to-noise ratio when base station i cooperates with j；
Receive signal-to-noise ratio when cooperation non-for base station i and j；
DoC (i, j) is bigger, and the desired value that base station i cooperates with j is bigger；Similarly, it can indicate that base station j cooperates with i with DoC (j, i)
Desired value；
Cooperation in high density home base station network it is expected that biggish base station is divided into same cluster；If Ω is random portion in network
The set of N number of small base station composition of administration, ψiThe set for jumping base station composition in neighboring cell list for the one of base station i, | ψi| for base station i's
One jumps the degree of neighboring cell list, PiIndicate the signal power strength summation that base station i receives；
Cooperate with base station clustering process as follows:
A) a jump neighboring cell list ψ is established for each base station ii, and calculate the degree of the neighboring cell list at the station | ψi|；
B) it is selected from Ω and meets condition i*=argmax | ψi| base station i*As the leader cluster node of base station cluster C1, while conduct
The control centre of the cluster, if there is multiple base stations for meeting condition, then therefrom selection meets conditionBase station i*'As leader cluster node；
If c) ψiIt is not sky, then from ψiIn select the cluster member for meeting the base station j of formula (1) as C1；Otherwise, it is directly entered step
d)；
D) base station in cluster C1 is gone to from Ω in set, i.e. Ω '=Ω-C1 updates in set of computations Ω ' | ψi'| and
E) step a)-d is repeated), until Ω is sky；
Step b carries out overlapping sub-clustering, to obtain overlapping cluster node；
Being overlapped sub-clustering, detailed process is as follows:
Mobile subscriber uiWhen mobile to target BS cluster C2 from base station cluster C1, it is overlapped cluster node c2iTo sense user u at firsti
Existing base station, this also means that mobile subscriber uiIt will be switched to C2 from C1, and using overlapping cluster-dividing method, carry out overlapping point
Cluster obtains overlapping cluster node；
The case where for isolated sub-clustering, is looked into using the boundary node of sub-clustering to the hop neighbor node transmission other than its affiliated sub-clustering
Request is ask, if the boundary node of adjacent sub-clustering receives inquiry request, there are two or more boundary nodes each other
Two adjacent base station sub-clusterings are carried out boundary fusion according to neighbor node, while the boundary of neighbours each other being saved by neighbor node
Point is as overlapping cluster node；
Step c, when user moves in cluster, using serving BS group dynamic self refresh method, completing switching in user's cluster is needed
It asks；When user carries out across cluster movement, using switching early warning mechanism, pretreatment is switched in advance, when preparing to reduce switching
Between, handoff procedure is then executed, seamless switching is finally completed；
Detailed process is as follows for switchover policy in cluster:
When user moves in cluster, the information such as load of the signal power and serving BS that are received according to user, selection meets
Initial service group of base stations of the base station of condition as user, with the movement of user, dynamic selection meets user's current service
The base station of demand is added in dynamic Service group of base stations, and deletes the base station for being unsatisfactory for demand for services, preferably to utilize resource
For user service, user is made to feel to have been at the center of a virtual big base station, and user does not need to carry out control plane switching；
Serving BS group (SS) Dynamic selection processes are specific as follows:
A) user u is calculatediThe signal power of each base station in the cluster C1 of base station is received, and is ranked up according to size；
B) leader cluster node C1LSelection signal performance number is biggish and is less than K base station of load threshold as user uiIt is initial
Serving BS group
C) with user uiMovement, willIn base station c1iBase station c1 adjacent theretojIt compares, if signal power strength
Less than c1j, then c1jIt is added toIn, and delete c1i；
Detailed process is as follows for switchover policy between cluster:
1. the condition of triggering switching early warning
User u in the cluster C1 of base stationiWhen mobile, as the overlapping cluster node c2 in C2 and C1iSense ui, i.e. uiIt is in c2iLetter
(u is used in number coverage areai∈C2iIndicate), if it is possible to determine uiIt is to c2iThe target base clusters C2 coverage area at place is moved
Dynamic, starting switching early warning switches between cluster and prepares；Therefore, it is overlapped cluster node c2iSense ui, and determine uiIt is mobile to C2,
It is the condition of triggering switching early warning；
The condition of triggering switching early warning may be expressed as:
2. switch step between cluster
A) user uiIn across cluster moving process, user u is detectediSituation of movement, if meeting formula (2), starting switching early warning, open
Dynamic pre-switch, executes step b)-c), otherwise it is assumed that user uiIt is moved in cluster, continues to execute switchover policy in cluster；
B) user uiMessage is sent to source base station cluster C1, the mark of the C2 of cluster containing target BS, informs that it can move into message
C2；
C) after C1 receives message, by the leader cluster node C1 in C1LTo the leader cluster node C2 of C2LSend pre-switch request (PRQ)；C2
In leader cluster node C2LIt is user u after receiving PRQiReserved switchable resource；
When d) meeting switching execution condition, by the leader cluster node C1 in C1LTo the leader cluster node C2 of C2LIt sends switching request (RQ)；
E) leader cluster node C2LAfter receiving RQ, according to reserved switchable resource situation, to C1LIt sends and replys confirmation request Ack；
F) leader cluster node C1LAfter receiving Ack, execution is switched over.
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| CN104581845B (en) * | 2015-02-15 | 2018-03-27 | 南京邮电大学 | A kind of super-intensive small network mobility management method in 5G systems based on cluster |
| CN105208615B (en) * | 2015-06-16 | 2019-04-16 | 南京邮电大学 | Based on the prediction adjustable switching method of thresholding hysteresis margin in a kind of super-intensive network |
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