CN102932836B - A kind of switching handling method and system - Google Patents

A kind of switching handling method and system Download PDF

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Publication number
CN102932836B
CN102932836B CN201110231517.8A CN201110231517A CN102932836B CN 102932836 B CN102932836 B CN 102932836B CN 201110231517 A CN201110231517 A CN 201110231517A CN 102932836 B CN102932836 B CN 102932836B
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information
target
switching
base station
handover
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CN102932836A (en
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施小娟
黄亚达
刘扬
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Jiangsu de Rubo new energy automobile manufacturing Co., Ltd.
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Pizhou Hi Tech Zone Biological Medicine Research Institute Co Ltd
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Priority to PCT/CN2012/072027 priority patent/WO2012155609A1/en
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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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of switching handling method and system, target BS sends handover information to source base station, and handover information includes the time division multiplexing distribution information of mark base station configuration, and source base station, and/or target BS are scheduled according to the handover information.Using the present invention, performance of handoffs when UE switches between macrocell and LPN cells can be strengthened, reduce handoff failure probability and call drop probability, improve Consumer's Experience and network performance.

Description

A kind of switching handling method and system
Technical field
The present invention relates to mobile communication technology field, more particularly to a kind of switching handling method and system.
Background technology
With the development of mobile communication and information technology, user's main flow growing to the demand of data service, current Mobile communications network, either using GSM, (Global System For Mobile Communication, the whole world are mobile logical Letter system)/GPRS (General Packet Radio Service, GPRS) generation of 2nd generation/the 2.5th moves Dynamic communication network, or using UMTS, (Universal Mobile Telecommunications System, General Mobile lead to Letter system) third generation mobile communications network, be all the homogeneous network (Homogeneous by operator's unified planning to deploy Network), homogeneous network is once dispose, and the capacity of network is fixed in certain area.In order to meet the data service of increasingly blowout Demand is, it is necessary to the more homogeneous network websites of operator deployment, on the one hand, isomorphism macro network website expense of disposing and uphold one's heritage It is high, on the other hand, a large amount of new sites are disposed on the basis of legacy network, each website once disposing, consolidate by its network capacity It is fixed, it is impossible to adapt to the demand and QoS (Quality of Service, service quality) that some areas business load changes in network The demand of change.
In order to adapt to the growing data traffic requirement of user, the 4th third-generation mobile communication is on the basis of original homogeneous network Upper some low power nodes (Lower Power Node, referred to as LPN) of deployment, including low-power micro-base station (pico eNB), Home eNodeB (HeNB/CSG/femto), via node (relay) etc., these low power nodes are compared due to its transmission power It is low, therefore relative to the macrocell (macro cell) that is covered of base station (eNB, NB etc.) of Incumbent unified plan, this The cell that a little low power nodes are covered can be collectively referred to as Microcell (micro cell) either cell (small cell) or Low power nodes cell (LPN cell).
Low power nodes deployment is flexible, for example can be deployed in hot spot region, increases the covering of hot spot region, such as Fig. 1 institutes Show it is a kind of schematic diagram of low power nodes focus covering.Low power nodes can flexibly be deployed in focus according to number of users Region, increase the network capacity of hot spot region, mitigate the load of hot spot region macrocell.Low power nodes can also be deployed in small Area edge, strengthen the covering of cell edge, Fig. 2 is a kind of schematic diagram of low power nodes cell edge covering, can effectively be increased The covering of strong cell edge, improve the Qos of Cell Edge User.In addition, low power nodes can also dispose indoors, enhanced room Interior covering, Fig. 3 show a kind of schematic diagram of low power nodes in-door covering, can effectively strengthen in-door covering, improve indoor The Qos of user, meets the high traffic demand of indoor user, while mitigates the load of macrocell.
The deployment of low power nodes, MPS process can be strengthened on the basis of traditional macrocell, increase network capacity, share Macrocell load, strengthen the quality of service of specific user.However, low power nodes are because its transmission power is low, its MPS process The relatively conventional macrocell of scope is much smaller, particularly with frequency deployment low power nodes, i.e., the working frequency of macrocell and its When the working frequency for the low power nodes disposed in coverage is identical, if switching is not in time, user equipment (User Equipment, referred to as UE) will be by the macrocell or described in the macrocell and the low power nodes cell edge The strong jamming of low power nodes cell, it is final to influence Consumer's Experience and systematic function so as to cause handoff failure or UE call drops.
Therefore, in the network that macrocell and low power nodes cell coexist, how correctly efficiently to realize UE grand small Reliable seamless switching between area and low power nodes cell, directly influences Consumer's Experience, is related to the portion of low power nodes Can administration really be embodied as traditional macrocell enhancing covering, strengthen network capacity, share macrocell load, so as to finally influence system System performance.And the switching handling method between existing macrocell and macrocell, still it cannot be guaranteed that UE is in macrocell and low-power section Reliable seamless switching between point cell.
The content of the invention
Present invention solves the technical problem that being to provide a kind of switching handling method and system, realize UE in different type cell Reliable seamless switching between (such as macrocell and low power nodes cell).
In order to solve the above technical problems, the invention provides a kind of switching handling method,
Target BS sends handover information to source base station；
The source base station, and/or the target BS are scheduled according to the handover information.
Further, methods described also includes：
The source base station sends to the target BS and switched before handover initiation or in set-up procedure is switched Enhancing solicited message or interference avoid solicited message.
Further, the handover information includes switching enhancement information or interference avoids information, the switching enhancing letter Breath or interference avoid information from including：The time division multiplexing distribution information of the target BS configuration.
Further, the source base station before handover initiation to the target BS send switching enhancing solicited message or Person's interference avoids solicited message, specifically includes：
After the source base station receives the information close to the Target cell under target BS control that user equipment (UE) reports, The source base station sends switching enhancing solicited message to the target BS or interference avoids solicited message.
Further, the source base station sends switching enhancing solicited message in set-up procedure is switched to the target BS Or interference avoids solicited message, specifically includes：
When initiating switching flow for be switched UE, the source base station needs the source base station in handover request or switching Ask to send switching enhancing solicited message to the target BS in message or disturb and avoid solicited message.
Further, the switching enhancing solicited message or interference avoid the solicited message from being：The UE was once resident Historical cell information (UE History Information).
Further, the target BS receive it is described switching enhancing solicited message or interference avoid solicited message Afterwards, the handover information is sent to the source base station.
Further, the time division multiplexing distribution information is the subframe assignment bit map information of fixed cycle.
Further, the source base station is scheduled according to the handover information, is specifically included：
The time division multiplexing that the source base station configures according to the target BS distributes information, under target BS reduction The to be switched UE under the source base station is dispatched on the time of row transmission power or stopping downlink transfer, or in the target BS Stop dispatching the to be switched UE under the source base station on the time of uplink and downlink transmission.
Further, the target BS is scheduled according to the handover information, is specifically included：
The target BS distributes information according to the time division multiplexing of configuration, right within the time for distributing to the target BS UE under the target BS is scheduled, and is stopped within the non-time for distributing to the target BS under the target BS UE be scheduled.
Further, the handover information includes switching enhancing effective time timer；
The source base station and/or the target BS are only in the run time of the switching enhancing effective time timer It is interior, it is scheduled according to the handover information.
Further, methods described also includes：
The target BS sends handover information to the source base station and cancels message；
The target BS is not limited after sending the handover information and cancelling message in scheduling by the handover information System；And/or the source base station is after receiving the handover information and cancelling message, in scheduling not by the handover information Limitation.
Further, the UE successful switch to after target BS, dispatching by the source base station and/or the target BS When do not limited by the handover information.
Present invention also offers a kind of switching processing system, the system is included in base station：
Handover information sending module, for sending handover information to source base station；
Handover information receiving module, for receiving the handover information of target BS transmission；
Schedule process module, for being scheduled according to the handover information.
Further, the system also includes：
Handover request module, for before handover initiation or in set-up procedure is switched, sending and cutting to target BS Change enhancing solicited message or interference avoids solicited message, specifically include：
After the information close to the Target cell under target BS control that UE is reported is received, sent out to the target BS Switching enhancing solicited message or interference is sent to avoid solicited message；
When initiating switching flow for be switched UE, sent out in handover request or handoff requirement message to target BS Switching enhancing solicited message or interference is sent to avoid solicited message.
Further, the switching enhancing solicited message or interference that the handover request module is sent avoid solicited message, Including：The information for the historical cell that the UE was once resident.
Further, the handover information sending module is used for, and is receiving described in the handover request module transmission After switching enhancing solicited message or interference avoid solicited message, the handover information is sent to the source base station.
Further, the handover information that the handover information sending module is sent includes switching enhancement information or dry Disturb and avoid information, the switching enhancement information or interference avoid information from including：The time division multiplexing distribution letter of target BS configuration Breath.
Further, the schedule process module is used for：
The time division multiplexing configured according to the target BS distributes information, and down transmitting power is reduced in the target BS Or stop dispatching to be switched UE under the source base station on time of downlink transfer, or the target BS stop it is up and The to be switched UE under the source base station is dispatched on the time of downlink transfer；
Or information is distributed according to the time division multiplexing of configuration, to the mesh within the time for distributing to the target BS UE under mark base station is scheduled, and stops entering the UE under the target BS within the non-time for distributing to the target BS Row scheduling.
Further, the handover information that the handover information sending module is sent includes：Switching enhancing effective time Timer；
The schedule process module only in the run time of the switching enhancing effective time timer, is cut according to described Information is changed to be scheduled.
Further, the handover information sending module is additionally operable to, and sending handover information to source base station cancels message；
The schedule process module is used for, the handover information sending module send the handover information cancel message, And/or after handover information receiving module receives the handover information cancellation message, in scheduling not by the handover information Limitation.
Further, the schedule process module is used for, after the UE successful switch to target BS, in scheduling not Limited by the handover information.
Using the above-mentioned hand-off process scheme of the present invention, can strengthen when UE switches between macrocell and LPN cells Performance of handoffs, handoff failure probability and call drop probability are reduced, improve Consumer's Experience and network performance.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of schematic diagram of low power nodes focus covering；
Fig. 2 is a kind of schematic diagram of low power nodes cell edge covering；
Fig. 3 is a kind of schematic diagram of low power nodes in-door covering；
Fig. 4 is the switching flow that source base station has direct interface (X2 interface) with target BS；
Fig. 5 is macrocell and low power nodes MPS process relation and corresponding covering position macrocell and low power nodes The signal quality variation schematic diagram of cell；
Fig. 6 is the schematic flow sheet of embodiment of the present invention；
Fig. 7 is the flow chart of the embodiment of the present invention one；
Fig. 8 is that a kind of time division multiplexing of switching enhancement information distributes the schematic diagram of information；
Fig. 9 is the flow chart of the embodiment of the present invention two；
Figure 10 is the flow chart of the embodiment of the present invention three；
Figure 11 is that the embodiment of the present invention four cancels the flow chart that interference avoids information/switching enhancement information.
Embodiment
Being illustrated in figure 4 source base station in correlation technique (being referred to as S-eNB) and target BS (being referred to as T-eNB) has direct interface The switching flow of (X2 interface), idiographic flow are as follows：
Step 401. measures；
UE measures serving cell and the signal quality of adjacent area.
Step 402.UE reporting measurement reports are to S-eNB；
UE is according to 401 measurement, reporting measurement reports, and the signal quality of Target cell is reported in measurement report.
After step 403.S-eNB receives measurement report, the handover decisions for being switched to Target cell are made.
Step 404.S-eNB and T-eNB switch over preparation, specifically include：
Step 404a.S-eNB sends handover request (HANDOVER REQUEST) to T-eNB, and T- is transmitted in handover request ENB prepares to receive the necessary information required for UE, such as UE in S-eNB X2 interface and S1 interface messages, Target cell it is small Area identifies (Cell Global Identity, CGI), and UE is in S-eNB contextual information etc.；
Step 404b.T-eNB sends switching request response (HANDOVER REQUEST ACKNOWLEDGE) to S-eNB, T-eNB is carried in switching request response target is accessed for the UE that the UE is configured according to contexts of the UE that S-eNB is sent in S-eNB The resource information of cell.
Step 405.S-eNB sends switching command to UE；
T-eNB is sent in switching command to be accessed for the UE that the UE is configured in S-eNB context according to the UE that S-eNB is sent The resource information of Target cell.
Step 406.UE is switched to Target cell.
Fig. 5 is a kind of macrocell and low power nodes MPS process relation (5a) and corresponding covering position macrocell and low Signal quality variation (5b) schematic diagram of power node cell.As shown in Figure 5 a, 501 be macro base station (eNB), and 502 be macro base station Macrocell (macro cell) under 501 controls, 503 be LPN, is deployed under 502macro cell coverages.504 be 503 Low power nodes cell (LPN cell) under control, because 503 transmission power is smaller, such as 30dB, therefore LPN Cell 504 coverage is much smaller than the coverage of macrocell 502.Certain user equipment (UE) is in Radio Resource at 502 times (Radio Resource Control) connection status is controlled, courses of the UE under the network coverage shown in Fig. 5 a is such as Shown in 505.506 is Zone switched between macrocell 502 and LPN cells 504, when UE advance to 506 it is Zone switched after, such as Fruit UE can 506 it is Zone switched in successfully complete switching from macrocell 502 to LPN cells 504 (such as using such as Fig. 4 institutes The switching flow shown), then one side UE business is maintained, it can be ensured that the business experience of user, the another aspect UE quilts To under 503LPN nodes, the load of macro base station 501 can be shared successful switch, add power system capacity.
But as shown in Figure 5 b, 510 be the signal quality variation schematic diagram of macrocell, and 511 be the signal quality of LPN cells Change schematic diagram, corresponding diagram 5a, 507~509 is Zone switched between macrocell 502 and LPN cells 504.Since 507, The signal quality of macrocell 502 reduces slow and the signal quality of LPN cells 504 quickly strengthens, therefore in Zone switched interior, UE In Signal Interference and Noise Ratio (the Signal to Interference plus Noise of serving cell (macrocell 502) Ratio, referred to as SINR) will quickly it reduce, it is possible to causing S-eNB in Fig. 4 to dispatch the measurement report of UE forwarding steps 402 Downlink resource assign signaling and/or S-eNB to be sent to UE step 405 switching command to be disturbed by target LPN cells (504) And reception failure, UE handoff failures even call drop is ultimately resulted in, influences UE business experience, and if in macrocell 502 and LPN Zone switched most of UE all handoff failures even call drop between cell 504, then most reduce network performance at last.Especially S-eNB is sent to UE switching command, because after UE reporting measurement reports, S-eNB needs to determine by switching as shown in Figure 4 Could be sent after plan and switching set-up procedure to UE, from receive UE measurement report to S-eNB and can order UE switchings, it is necessary to by The time delay of a few tens of milliseconds (ms), now SINRs of the UE in cell-of-origin is very poor, therefore most likely results in switching command It is interfered and reception failure.
Shown in Fig. 5 is that UE is likely to occur handoff failure when being moved to LPN cells from macrocell according to 505 course Or the situation of call drop, when UE moves from LPN cells to macrocell, can similarly there is the SINR because of UE in serving cell Quick reduce and cause UE from LPN cells to macrocell handoff failure the even situation of call drop.
To solve the above problems, present embodiment proposes a kind of switching handling method, it is small in different type for strengthening UE Performance of handoffs when switching between area's (such as macrocell and LPN cells), improve Consumer's Experience and network performance.As shown in fig. 6, The switching handling method of present embodiment uses following scheme：
Step 601 (optional) source base stations are cut to target BS transmission before handover initiation or in switching set-up procedure Change enhancing solicited message (or interference avoids solicited message)；
Wherein, the step is optional step, i.e., source base station also can not to target BS send switching enhancing solicited message (or Interference avoids solicited message).
Step 602. target BS feeds back handover information to source base station；
Described handover information specifically includes switching enhancement information or interference avoids information；
Step 603. source base station and/or target BS consider handover information (as switching enhancement information or interference are kept away when dispatching Exempt from information) limitation.
Wherein, to target BS transmission switching enhancing solicited message, (interference avoids asking source base station before handover initiation Information), refer to：During the information of the Target cell under what source base station received that UE reports control close to target BS, source base station is to mesh Base station transmission switching enhancing request message (interference avoids request message) is marked, or carries switching enhancing solicited message item and (does Disturb and avoid solicited message item) X2 interface message.
The target BS receives the switching enhancing request message (interference avoids request message) or carried and cuts After changing the X2 interface message of enhancing solicited message item (interference avoids solicited message item), switching enhancing letter is sent to the source base station Breath message (interference avoids informational message) or the X2 interface message for carrying switching enhancement information item (interference avoids item of information).
Source base station and target BS consider the limitation of switching enhancement information (interference avoids information) when dispatching.
Preferably, the UE successful switch is to after the target BS, or the target BS is sent out to the source base station Switching enhancement information (interference avoids information) is sent after a period of time, the target BS sends switching enhancing letter to the source base station Cease (interference avoids information) and cancel message, not by switching enhancement information (interference when the target BS and the source base station are dispatched Avoid information) limitation.
Wherein, source base station sends switching enhancing request (interference avoids asking) in set-up procedure is switched to target BS, Refer to：Source base station sends switching enhancing solicited message item in handover request, handoff requirement message, and (interference avoids solicited message ), or source base station sends the information for the historical cell that UE was once resident in handover request message, the target BS receipts The historical cell being once resident to the switching enhancing solicited message item (interference avoids solicited message item) or the UE After information, switching enhancement information item is sent to source base station in switching request response (interference avoids item of information).Source base station and mesh The limitation of switching enhancement information (interference avoids information) is considered when marking base station scheduling.
Preferably, UE successful switch is to after target BS, not by switching enhancement information when target BS and source base station are dispatched The limitation of (interference avoids information).
Wherein, described switching enhancement information (interference avoids information) is that the time division multiplexing of T-eNB configurations distributes information.
Specifically, the time division multiplexing information is：The subframe assignment bit map information of fixed cycle.
Preferably, the switching enhancement information (interference avoids information) can also determine including switching enhancement information effective time When device, the source base station and the target BS only consider switching in switching enhancement information effective time timer run time The limitation of enhancement information (interference avoids information).
Further, source base station considers the limitation of switching enhancement information (interference avoids information) in scheduling, specifically includes：
The time division multiplexing that source base station configures according to the target BS distributes information, and downlink work(is reduced in target BS The to be switched UE under source base station is dispatched on the time of rate or stopping downlink transfer, or stops uplink and downlink in target BS and passes The to be switched UE under source base station is dispatched on the defeated time.
Target BS considers the limitation of switching enhancement information (interference avoids information) in scheduling, specifically includes：
Target BS distributes information according to the time division multiplexing of configuration, to target BS within the time for distribute to target BS Under UE be scheduled, within the non-time for distributing to target BS stop to target BS under UE be scheduled.
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application Feature can mutually be combined.
Embodiment one
UE is moved to Zone switched between macrocell and LPN cells from macrocell, or UE is moved to from LPN cells It is Zone switched between LPN cells and macrocell.Source base station (S-eNB) where macrocell and LPN nodes (T- where LPN cells ENB there is direct physical connection X2 interface between).
As shown in fig. 7, performance of handoffs when switching for enhancing UE between macrocell and LPN cells, the present embodiment are specific Realization is described as follows：
Step 701. measures；
UE measures serving cell and the signal quality of adjacent area.
Step 702.UE reporting measurement reports are to S-eNB；
UE is according to the measurement of step 701, reporting measurement reports, and the signal quality of Target cell is reported in measurement report.
After step 703.S-eNB receives measurement report, the handover decisions for being switched to Target cell are made.At the same time, S- ENB is according to its adjacent area list information or according to OAM (Operation Administration and Maintenance, net Pipe) configuration, judge to be one by Target cell that (for example the present embodiment Target cell is one with the different types of cell of serving cell LPN cells under individual LPN controls), further optimize, S-eNB is also judged between the cell site between Target cell and cell-of-origin Away from smaller.That is S-eNB judges Zone switched relative between normal macrocell and macrocell between Target cell and cell-of-origin Station spacing it is much smaller, it is necessary to switch over enhancing, then S-eNB makes simultaneously needs the decision-making for switching over enhancing.
Step 704.S-eNB and T-eNB switch over preparation, specifically include：
Step 704a.S-eNB sends handover request to T-eNB, is transmitted in handover request except sending in Fig. 4-404a Information outside, S-eNB also to T-eNB send switching enhancing request or switching enhancing instruction；
Step 704b.T-eNB sends switching request response to S-eNB, except carrying Fig. 4-404b in switching request response In information outside, T-eNB also to S-eNB send switching enhancement information.
The switching enhancement information can be the time division multiplexing distribution information of T-eNB configurations, such as FDD (Frequency Division Duplexing, FDD) system, the time division multiplexing distribution information can be that a cycle is 40ms subframe assignment bit map, a subframe is represented than in subframe assignment bit map as shown in Figure 8, each is corresponded to, " 0 " represents T-eNB reduces down transmitting power or stops downlink transfer in corresponding subframe, either stops uplink and downlink transmission or claims Corresponding subframe distributes to T-eNB；" 1 " represents that the T-eNB in corresponding subframe does not stop uplink and downlink transmission and (scheme is hereinafter described When, it is all based on such a method for expressing and illustrates), or correspond to subframe and be not assigned to T-eNB.Opposite table can certainly be used Show, for example " 0 " represents that T-eNB does not stop uplink and downlink transmission in corresponding subframe, " 1 " represents that T-eNB is reduced in corresponding subframe Down transmitting power stops downlink transfer, or stops uplink and downlink transmission.Such as time division duplex (Time Division Duplexing, TDD) system, for TDD with setting to 0 down, the time division multiplexing distribution information can be a week in LTE Phase is 70ms subframe assignment bit map.I.e. described time division multiplexing multiplexing distribution information can be fixed cycle (or regular length) Subframe assignment bit map.
For step 705. in handoff procedure, S-eNB and T-eNB consider the limitation of switching enhancement information when dispatching.
Specifically, for S-eNB, when S-eNB dispatches switching command (705.a) to UE transmissions, switching enhancing letter is considered The limitation of breath, such as, based on the time division multiplexing distribution information " sub-frame configuration bitmap " shown in Fig. 8, the S-eNB scheduling switching life When making, switching command described in the subframe scheduling of " 0 " is expressed as in sub-frame configuration bitmap shown in Fig. 8, i.e., is dropped in S-eNB in T-eNB Low down transmitting power/either stop downlink transfer/or stop switching command described in the subframe scheduling of uplink and downlink transmission.
Specifically, for T-eNB, T-eNB considers the limitation of switching enhancement information when dispatching the UE under T-eNB, such as, can Based on the time division multiplexing distribution information " sub-frame configuration bitmap " shown in Fig. 8, when T-eNB dispatches the UE under T-eNB, shown in Fig. 8 Sub-frame configuration bitmap in be expressed as these UE of the subframe scheduling of " 1 ", and stop scheduling T- shown in FIG as the subframe of " 0 " Each UE under eNB, or each UE in the subframe of " 0 " under scheduling T-eNB is expressed as even in these, T-eNB is in these subframes Upper reduction transmission power.
Step 706.UE is switched to Target cell.
Above switching handling method can strengthen performance of handoffs when UE switches between macrocell and LPN cells, reduce Handoff failure probability and call drop probability, improve Consumer's Experience and network performance.
Further, while performance of handoffs is strengthened, in order to reduce the scheduling limitation to LPN cells, this implementation as far as possible Example step 704b switching enhancement information can also include switching enhancement information effective time timer, so as to step 705S- ENB and T-eNB needs during scheduling to consider switching enhancing only in the switching enhancement information effective time timer run time The limitation of information.
Or while performance of handoffs is strengthened, the scheduling limitation to LPN cells is reduced as far as possible, the scheme can be with It is that after UE successful switch to Target cell, T-eNB deletes the switching enhancement information, and hereafter T-eNB dispatches the UE under T-eNB When need not consider switching enhancement information limitation.And UE successful switch is to after Target cell, T-eNB can be in correlation technique S-eNB sends UE contexts release message (UE CONTEXT RELEASE), will after S-eNB receives UE context release messages Discharge all resources that S-eNB configures the UE.
Embodiment two
In the present embodiment, UE is moved to Zone switched between macrocell and LPN cells from macrocell, or UE is from LPN Cell is moved to Zone switched between LPN cells and macrocell.Source base station (S-eNB) where macrocell and LPN cells place There is no direct physical connection X2 interface between LPN nodes (T-eNB), thus UE from S-eNB be switched to T-eNB when, all S-eNB Hand off signaling between T-eNB must forward via core network element, such as via mobility management entity (Mobility Management Entity, MME) forwarding.
As shown in figure 9, performance of handoffs when switching for enhancing UE between macrocell and LPN cells, the present embodiment are specific Realize as follows：
Step 901. measures；
UE measures serving cell and the signal quality of adjacent area.
Step 902.UE reporting measurement reports are to S-eNB；
UE is according to the measurement of step 901, reporting measurement reports, and the signal quality of Target cell is reported in measurement report.
After step 903.S-eNB receives measurement report, the handover decisions for being switched to Target cell are made.
Step 904.S-eNB and T-eNB switch over preparation, specifically include：
Step 904a.S-eNB sends switching demand (HANDOVER REQUIRED) to MME, removes and is carried only in switching demand One mark UE also carries context letters of the UE in source base station that source base station is sent to target BS outside S-eNB and MME information Breath.According to correlation technique.UE includes RAB information (Radios of the UE in source base station in the contextual information of source base station Access Bear, just referred to as RAB), UE (is specifically encapsulated in RRC Container in the RRC configurations relevant information of source base station In item of information), in addition to the information (UE History Information) of historical cell that UE was once resident, the UE was once The information of historical cell through being resident comprises at least the CGI of cell-of-origin, the cell type of cell-of-origin, UE and is in cell-of-origin The information such as the time of RRC connection status, the cell type of cell-of-origin, i.e. cell-of-origin cell size information, such as minimum cell, The types such as cell, medium cell, big cell.
Step 904b.MME sends handover request to T-eNB.
After MME receives the switching demand that S-eNB is sent, extraction but do not parse source base station and be sent to the UE of target BS and exist The contextual information of source base station, UE is transmitted to by handover request by T-eNB in the contextual information of source base station.
Step 904c.T-eNB is received after MME obtains handover request, makes the decision for receiving UE, meanwhile, T-eNB is according to S- The information of historical cell that the UE that eNB is sent once was resident, it is from source macrocell (such as the type of cell-of-origin to judge the UE Big cell) switch, i.e., described UE is to be switched to LPN cells from macrocell, therefore makes the decision-making of switching enhancing.
Step 904d.T-eNB sends switching request response to MME.
According to correlation technique, carrying T-eNB is the RAB information of UE configurations in switching request response and T-eNB is UE configurations Other RRC configuration informations (being specifically encapsulated in RRC Container items of information).In addition, also carried in switching request response The switching enhancement information of T-eNB configurations, the switching enhancement information can be specifically encapsulated in above-mentioned RRC Container, The item of information independently of RRC Container can also be packaged into.Similar 704b, the switching enhancement information can specifically wrap Time division multiplexing distribution information is included, switching enhancement information effective time timer can also be included.
Step 904e.MME sends switching command (HANDOVER COMMAND) to S-eNB
After MME receives the handover request ack message that T-eNB is sent, T-eNB is allocated to by switching command UE RAB Information, RRC configuration information, switching enhancement information etc. is sent to S-eNB.
For step 905. in handoff procedure, S-eNB and T-eNB consider the limitation of switching enhancement information when dispatching.
Specifically, for S-eNB, when S-eNB dispatches switching command (the step 905a) to UE transmissions, switching enhancing is considered The limitation of information；Specifically, for T-eNB, T-eNB considers the limitation of switching enhancement information when dispatching the UE under T-eNB, such as The UE being only expressed as in enhancement information is switched under the subframe scheduling T-eNB of " 1 ", and stop scheduling in the subframe for being expressed as " 0 " Each UE under T-eNB, or the UE in the subframe of " 0 " under scheduling T-eNB is expressed as even in these, T-eNB is in these subframes Upper reduction transmission power.
Step 906.UE is switched to Target cell.
When above switching handling method can not have an X2 interface between S-eNB and T-eNB (such as source macro base station and family Between base station), strengthen performance of handoffs when switching between macrocell and LPN cells, reduce handoff failure probability and call drop probability, Improve Consumer's Experience and network performance.
It should be noted that in the present embodiment, switching enhancing decision-making can be made by T-eNB, can also be made by S-eNB Switching enhancing decision-making.Similar, switching enhancing decision-making is made by S-eNB, can also be gone through by T-eNB according to what UE was once resident The information of history cell makes switching enhancing decision-making.
Embodiment three
UE is moved to Zone switched between macrocell and LPN cells from macrocell, or UE is moved to from LPN cells It is Zone switched between LPN cells and macrocell.Source base station (S-eNB) where macrocell and LPN nodes (T- where LPN cells ENB there is direct physical connection X2 interface between).
As shown in Figure 10, performance of handoffs when switching for enhancing UE between macrocell and LPN cells, the present embodiment are specific Realization is described as follows：
Step 1001.UE sends the instruction close to LPN cells to S-eNB；
UE is sent out by location information or according to mechanism such as the UE positional informations of LPN cells once accessed preserved A LPN cell is now approached, UE sends close to LPN cells to S-eNB and indicated.
Step 1002.S-eNB sends interference to T-eNB and avoids asking, or claims switching enhancing request.
The interference avoids request/switching enhancing request, can also be realized by extending the message on existing X2 interface, i.e., Increase item of information in existing X2 interface message to realize, for example request (MOBILITY is sexually revised in the movement of existing X2 interface CHANGE REQUEST) message, increase interference in the resource updates request message such as (RESOURCE STATUS REQUEST) message Request/switching enhancing solicited message item is avoided to realize.
Step 1003.T-eNB sends interference to S-eNB and avoids information, or claims switching enhancement information.
The interference avoids information/switching enhancement information, similar embodiment one, when can be specifically T-eNB configurations Divide multiplexing distribution information.
The interference avoids information/switching enhancement information, can also be realized by extending the message on X2 interface, i.e., Having increases item of information in X2 interface message realizes, for example sexually revises response (MOBILITY CHANGE in the movement of existing X2 interface ACKNOWLEDGE) increase interference is kept away in the message such as message, resource updates response (RESOURCE STATUS RESPONSE) message Exempt from item of information/switching enhancement information item to realize.
Step 1004.S-eNB and T-eNB considers that interference avoids information/switching enhancement information in follow-up scheduling process Limitation.Specifically, S-eNB is before the UE is switched to target LPN cells, the scheduling to the UE, it may be considered that interference Avoid the limitation of information/switching enhancement information；T-eNB is before the UE successful switch to target LPN cells, under T-eNB UE scheduling, it may be considered that interference avoids the limitation of information/switching enhancement information.
Specifically, in the follow-up UE of the present embodiment handoff procedure, scheduling of the S-eNB to the UE, it may be considered that interference The limitation of information/switching enhancement information is avoided, including：
Step 1004a.UE measures LPN cells, when the signal quality of LPN cells meets the report condition of S-eNB configurations, Reporting measurement reports.
UE reporting measurement reports are, it is necessary to which S-eNB scheduling sends the ascending resource of the measurement report, in order to avoid S-eNB The dispatch that scheduling sends the ascending resource of the measurement report is disturbed, and when S-eNB sends the dispatch, is considered dry Disturb the limitation for avoiding information/switching enhancement information.For example if the interference of the present embodiment avoids information/switching enhancement information such as Fig. 8 Time division multiplexing distribution information shown in, then S-eNB send the dispatch when, sub-frame configuration bitmap shown in Fig. 8 represent For switching command described in the subframe scheduling of " 0 ", i.e. S-eNB T-eNB reduce down transmitting power/or stop downlink transfer/ Or stop switching command described in the subframe scheduling of uplink and downlink transmission.
Step 1004d.S-eNB sends switching command to UE.S-eNB dispatch switching command when, consider interference avoid information/ Switch the limitation of enhancement information, embodiment is the same as abovementioned steps 705.
Step 1005 and 1006. is the same as previous embodiment one.
Above switching handling method can strengthen performance of handoffs when UE switches between macrocell and LPN cells, reduce Handoff failure probability and call drop probability, improve Consumer's Experience and network performance.
Example IV
While performance of handoffs is strengthened, in order to reduce the scheduling limitation to S-eNB and LPN cells, the present embodiment as far as possible It also proposed interference and avoid information/switching enhancement information canceling method.
As shown in figure 11, in the present embodiment, after UE is switched to T-eNB, or, T-eNB sends interference in step 1003 and kept away Exempt from after information/switching enhancement information after a period of time, T-eNB is sent to S-eNB to be cancelled interference and avoid information/switching enhancing letter Notice (the step 1101) of breath, hereafter T-eNB and S-eNB scheduling need not all consider further that the interference avoids information/switching The limitation of enhancement information.Or T-eNB avoids information/switching enhancement information from may be used also to the S-eNB interference sent in step 1003 To avoid information/switching enhancement information effective time timer, the S-eNB and T-eNB after the timer expiry including interference Scheduling no longer needs to consider the limitation that interference avoids information/switching enhancement information.
Embodiment five
LPN nodes are deployed with macrocell coverage area, have direct physics between source base station and LPN nodes where macrocell Connect (X2 interface).
When LPN nodes establish X2 interface with source macro base station, or LPN nodes have been established after X2 interface with source macro base station, LPN nodes send interference to source macro base station and avoid information/switching enhancement information.The interference avoids information/switching enhancement information The specially time division multiplexing distribution information of LPN nodes configuration.
LPN nodes and source macro base station consider that interference avoids the limit of information/switching enhancement information in follow-up scheduling process System.
Specifically, source macro base station is after receiving certain UE and reporting the instruction close to LPN cells of source macro base station, it is follow-up to adjust The limitation disturbed and avoid information/switching enhancement information is considered when spending the UE.Optimization, source macro base station is on the UE is received After a period of time of the instruction close to LPN cells of report, if the UE is not switched to LPN cells；Or the UE is switched to After LPN cells, source macro base station cancels the limitation disturbed and avoid information/switching enhancement information when dispatching the UE.
Specifically, after LPN nodes avoid information/switching enhancement information to the source macro base station transmission interference, LPN is dispatched Under UE when, consider that described disturb avoids the limitation of information/switching enhancement information.
In addition, additionally provide a kind of switching processing system in the embodiment of the present invention, the system mainly include in base station as Lower functional module：
Handover information sending module, for sending handover information to source base station；
Handover information receiving module, for receiving the handover information of target BS transmission；
Schedule process module, for being scheduled according to the handover information.
Further, the system also includes：
Handover request module, for before handover initiation or in set-up procedure is switched, sending and cutting to target BS Change enhancing solicited message or interference avoids solicited message, specifically include：
After the information close to the Target cell under target BS control that UE is reported is received, sent out to the target BS Switching enhancing solicited message or interference is sent to avoid solicited message；
When initiating switching flow for be switched UE, sent out in handover request or handoff requirement message to target BS Switching enhancing solicited message or interference is sent to avoid solicited message.
Further, the switching enhancing solicited message or interference that the handover request module is sent avoid solicited message, Including：The information for the historical cell that the UE was once resident.
Further, the handover information sending module is used for, and is receiving described in the handover request module transmission After switching enhancing solicited message or interference avoid solicited message, the handover information is sent to the source base station.
Further, the handover information that the handover information sending module is sent includes switching enhancement information or dry Disturb and avoid information, the switching enhancement information or interference avoid information from including：The time division multiplexing distribution letter of target BS configuration Breath.
Further, the schedule process module is used for：
The time division multiplexing configured according to the target BS distributes information, and down transmitting power is reduced in the target BS Or stop dispatching to be switched UE under the source base station on time of downlink transfer, or the target BS stop it is up and The to be switched UE under the source base station is dispatched on the time of downlink transfer；
Or information is distributed according to the time division multiplexing of configuration, to the mesh within the time for distributing to the target BS UE under mark base station is scheduled, and stops entering the UE under the target BS within the non-time for distributing to the target BS Row scheduling.
Further, the handover information that the handover information sending module is sent includes：Switching enhancing effective time Timer；
The schedule process module only in the run time of the switching enhancing effective time timer, is cut according to described Information is changed to be scheduled.
Further, the handover information sending module is additionally operable to, and sending handover information to source base station cancels message；
The schedule process module is used for, the handover information sending module send the handover information cancel message, And/or after handover information receiving module receives the handover information cancellation message, in scheduling not by the handover information Limitation.
Further, the schedule process module is used for, after the UE successful switch to target BS, in scheduling not Limited by the handover information.
It these are only that the present invention's is preferable to carry out case, be not intended to limit the invention, the present invention can also have other Various embodiments, in the case of without departing substantially from spirit of the invention and its essence, those skilled in the art can be according to this hair It is bright to make various corresponding changes and deformation, but these corresponding changes and deformation should all belong to appended claims of the invention Protection domain.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.

Claims (16)

  1. A kind of 1. switching handling method, it is characterised in that
    Source base station sends switching enhancing solicited message before handover initiation or in set-up procedure is switched, to target BS Or interference avoids solicited message；
    Target BS sends handover information to source base station, and the handover information includes switching enhancement information or interference avoids letter Breath；The switching enhancement information or interference avoid information from including：The time division multiplexing distribution information of the target BS configuration；
    The source base station and/or the target BS are scheduled in handoff procedure according to the handover information；
    The source base station is scheduled according to the handover information, is specifically included：
    The time division multiplexing that the source base station configures according to the target BS distributes information, and descending hair is reduced in the target BS The to be switched UE dispatched under the source base station is penetrated on the time of power or stopping downlink transfer, or is stopped in the target BS The to be switched UE under the source base station is dispatched on the time of uplink and downlink transmission；
    The target BS is scheduled according to the handover information, is specifically included：
    The target BS distributes information according to the time division multiplexing of configuration, to described within the time for distributing to the target BS UE under target BS is scheduled, and is stopped within the non-time for distributing to the target BS to the UE under the target BS It is scheduled.
  2. 2. the method as described in claim 1, it is characterised in that
    The source base station sends switching enhancing solicited message to the target BS before handover initiation or interference avoids asking Information is sought, is specifically included：
    After the source base station receives the information close to the Target cell under target BS control of reported by user equipment UE, the source Base station sends switching enhancing solicited message to the target BS or interference avoids solicited message.
  3. 3. the method as described in claim 1, it is characterised in that
    The source base station sends switching enhancing solicited message to the target BS in set-up procedure is switched or interference avoids Solicited message, specifically include：
    When initiating switching flow for be switched UE, the source base station disappears the source base station in handover request or switching demand Switching enhancing solicited message is sent to the target BS or interference avoids solicited message in breath.
  4. 4. method as claimed in claim 3, it is characterised in that
    The switching enhancing solicited message or interference avoid the solicited message from being：The letter for the historical cell that the UE was once resident Cease UE History Information.
  5. 5. the method as described in claim any one of 1-4, it is characterised in that
    The target BS receive it is described switching enhancing solicited message or interference avoid solicited message after, to the source base Stand and send the handover information.
  6. 6. the method as described in claim 1, it is characterised in that
    The time division multiplexing distribution information is the subframe assignment bit map information of fixed cycle.
  7. 7. the method as described in claim 1, it is characterised in that
    The handover information includes switching enhancing effective time timer；
    The source base station and/or the target BS are only in the run time of the switching enhancing effective time timer, root It is scheduled according to the handover information.
  8. 8. the method as described in claim 1, it is characterised in that methods described also includes：
    The target BS sends handover information to the source base station and cancels message；
    The target BS is not limited after sending the handover information and cancelling message in scheduling by the handover information； And/or the source base station is not limited after receiving the handover information and cancelling message in scheduling by the handover information System.
  9. 9. the method as described in claim 1, it is characterised in that
    UE successful switch to after target BS, in scheduling by the switching do not believed by the source base station and/or the target BS The limitation of breath.
  10. 10. a kind of switching processing system, it is characterised in that the system is included in base station：
    Handover request module, for before handover initiation or in set-up procedure is switched, sending switching to target BS and increasing Strong solicited message or interference avoid solicited message；
    Handover information sending module, for source base station send handover information, the handover information include switching enhancement information or Person's interference avoids information；The switching enhancement information or interference avoid information from including：The time-division of the target BS configuration answers With distribution information；
    Handover information receiving module, for receiving the handover information of target BS transmission；
    Schedule process module, in handoff procedure, being scheduled according to the handover information；
    The schedule process module is used for：
    The time division multiplexing configured according to the target BS distributes information, reduces down transmitting power in the target BS or stops The to be switched UE under the source base station is only dispatched on the time of downlink transfer, or stops uplink and downlink in the target BS The to be switched UE under the source base station is dispatched on the time of transmission；
    Or information is distributed according to the time division multiplexing of configuration, to the target base within the time for distributing to the target BS UE under standing is scheduled, and stops adjusting the UE under the target BS within the non-time for distributing to the target BS Degree.
  11. 11. system as claimed in claim 10, it is characterised in that the system also includes：
    Handover request module, for before handover initiation or in set-up procedure is switched, sending switching to target BS and increasing Strong solicited message or interference avoid solicited message, specifically include：
    After the information close to the Target cell under target BS control that UE is reported is received, send and cut to the target BS Change enhancing solicited message or interference avoids solicited message；
    When initiating switching flow for be switched UE, send and cut to target BS in handover request or handoff requirement message Change enhancing solicited message or interference avoids solicited message.
  12. 12. system as claimed in claim 11, it is characterised in that
    The switching enhancing solicited message or interference that the handover request module is sent avoid solicited message, including：The UE was once The information of historical cell through being resident.
  13. 13. system as claimed in claim 11, it is characterised in that
    The handover information sending module is used for, and is receiving the switching enhancing request letter of the handover request module transmission After breath or interference avoid solicited message, the handover information is sent to the source base station.
  14. 14. system as claimed in claim 10, it is characterised in that
    The handover information that the handover information sending module is sent includes：Switching enhancing effective time timer；
    The schedule process module only in the run time of the switching enhancing effective time timer, is believed according to the switching Breath is scheduled.
  15. 15. system as claimed in claim 10, it is characterised in that
    The handover information sending module is additionally operable to, and sending handover information to source base station cancels message；
    The schedule process module is used for, the handover information sending module send the handover information cancel message, and/or After handover information receiving module receives the handover information cancellation message, do not limited in scheduling by the handover information System.
  16. 16. system as claimed in claim 10, it is characterised in that
    The schedule process module is used for, after UE successful switch to target BS, in scheduling not by the handover information Limitation.
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