CN101873651A - Method and system for switching link between evolved node Bs and evolved node Bs - Google Patents
Method and system for switching link between evolved node Bs and evolved node Bs Download PDFInfo
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Abstract
The invention discloses a method for switching a link between evolved node Bs (eNBs), which comprises the following steps that: a source eNB sends a first load switching request to an adjacent eNB when the load state of the source eNB per se meets the switching condition, wherein the first load switching request contains a data link identifier of at least one RRU in the source eNB; and the source eNB switches an RRU data link corresponding to the RRU data link identifier to a target eNB when receiving a switching allowance response message returned by the target eNB. Through the method, the load needing to be processed is transferred to the adjacent eNB when the eNB is overloaded, so that resource sharing between the eNBs which are adjacent to each other is realized, and the problem that one eNB is overloaded due to burst telephone traffic is effectively solved. The invention also discloses a system for switching the link between the eNBs and the eNBs.
Description
Technical field
The present invention relates to the communications field, relate in particular to method, system and the evolution base station of link switchover between a kind of evolution base station.
Background technology
The characteristics of the existing 3GPP mobile communication system of continuity, the LTE system architecture comprises two parts, a part is core net (the Evolved Packet Core after the evolution, EPC), comprise mobile management entity gateway equipment such as (MME/S-GW), another part is Access Network (the Evolved Universal Terrestrial Radio Access Network after the evolution, E-UTRAN), comprise that (Evolved Node B eNB) waits equipment to evolution base station, and its structure as shown in Figure 1.MME/S-GW and eNB are by the S1 interface communication, and in the Access Network part, in order to reduce user's propagation delay time, architecture design is tending towards flattening more compared to the 3G system, has only comprised a plurality of eNB.
Connect by X2 interface between each eNB, the major function of X2 interface is to realize the transmission of user data between the eNB.At present, explicitly call for X2 interface to support the mobile management function of following function: UE (at the LTE intra-system handover), load management function, X2 interface management function (comprise and resetting and wrong indication) and Inter-Cell Interference Coordination function etc. in the existing LTE standard criterion.Load management function in the X2 interface is at present main support the mutual operating position of interface-free resources separately between the adjacent eNB, concrete mutual information to comprise in real time and the Resource Block of non-real-time service (Resource Block RB) occupies ratio.
In the process of current LTE system standardization, though X2 interface can be used for the UE switching between the base station and support interface-free resources to utilize the mutual of situation, but X2 interface or other data transmission interface agreements are not all considered the load-balancing mechanism between the base station at present, that is to say, each eNB only provides service for the UE of this sub-district, when the load of eNB is excessive (disposal ability of eNB can't satisfy the service needed of this sub-district UE), cause the serious problems such as service disconnection of UE in the sub-district possibly; And when the load of eNB is too small (disposal ability of eNB is much larger than the service needed of this sub-district UE), may cause the wasting of resources again, make that the whole Business Processing efficient of a plurality of eNB is lower in the Access Network.
Summary of the invention
The embodiment of the invention provides method, system and the evolution base station of link switchover between a kind of evolution base station, to solve the excessive overload problem that causes of load as eNB.
The method of link switchover between a kind of evolution base station eNB, described method comprises:
When source eNB satisfies switching condition at the state of self load, send the first load handoff request, comprise at least one the remote radio unit (RRU) RRU data link sign among the eNB of source in the described first load handoff request to adjacent target eNB;
Source eNB switches to target eNB with the corresponding RRU data link of described RRU data link sign when receiving the permission switching response message that target eNB returns.
The system of link switchover between a kind of eNB, described system comprise an eNB and two eNB adjacent with an eNB, wherein:
The one eNB, be used for when the state of self load satisfies switching condition, send the first load handoff request to the 2nd eNB, comprise at least one the RRU data link sign among the eNB in the described first load handoff request, and, when receiving the permission switching response message that the 2nd eNB returns, the corresponding RRU data link of described RRU data link sign is switched to the 2nd eNB;
The 2nd eNB is used for returning the permission switching response message to an eNB when receiving the first load handoff request.
A kind of evolution base station, described evolution base station comprises:
The switching condition detection module, whether the state that is used to detect self load satisfies switching condition;
First request sending module, being used in testing result is the state of load when satisfying switching condition, sends the first load handoff request to other evolution base stations, comprises at least one the RRU data link sign of self in the described first load handoff request;
Handover module is used for when receiving the permission switching response message, and the corresponding RRU data link of described RRU data link sign is switched to other adjacent evolution base stations;
The request receiver module, be used to receive the load handoff request that other adjacent evolution base stations send, at least one the RRU data link sign that comprises other evolution base stations in the described load handoff request, and the RRU data link of RRU data link sign correspondence is adjacent with self.
Consider in the prior art, eNB only provides service according to the load disposal ability of self for the UE in the sub-district, cause when the load disposal ability deficiency of eNB thinks that UE provides service, occurring the problem of overload probably, therefore, the present invention proposes when overload appears in eNB, the load migration that self need handle to adjacent eNB, is realized resource-sharing between the adjacent eNB, effectively avoid the problem of a certain eNB overload that causes because of the bursts of traffic amount.
Description of drawings
Fig. 1 is a LTE system architecture schematic diagram in the prior art;
The step schematic diagram of Fig. 2 for carrying out link switchover between eNB in the embodiment of the invention one;
Fig. 3 is a RRU data link switching flow schematic diagram in the embodiment of the invention one;
Fig. 4 realizes fine granularity link switchover step schematic diagram between eNB in the embodiment of the invention two;
Fig. 5 is a link switchover step schematic diagram between the eNB of thick in the embodiment of the invention three, fine granularity combination;
Fig. 6 is the system schematic of link switchover between eNB in the embodiment of the invention four;
Fig. 7 is an evolution base station schematic diagram in the embodiment of the invention five.
Embodiment
In the embodiment of the invention, in order to realize the load balancing of eNB, the Signalling exchange that design is relevant between adjacent eNB, triggering flow process and coordination mechanism, make when the load of an eNB is excessive, eNB that other that load migration is extremely adjacent are relatively idle, the equalizing network efficiency of resource is effectively avoided the problem that causes part eNB to transship because of the traffic carrying capacity that increases suddenly.
When 3G network was disposed, industry had proposed the distributed base station scheme, was provided with two relatively independent parts in the distributed base station scheme: Base Band Unit (Base band Unit, BBU) and remote radio unit (RRU) (Remote Radio Unit, RRU).Wherein, the function that mainly realizes of BBU is: master control, clock, Base-Band Processing and Iub interface processing etc.; The function that RRU mainly realizes is: digital intermediate frequency, transceiver, power amplifier and LNA etc.
Because a RRU need be responsible for the radio frequency processing of a plurality of contained fans, and a contained fan can be served tens users in the 3G system, in the LTE system even can serve up to a hundred users, so the present invention proposes the RRU of the eNB that load is excessive and migrates to other adjacent eNB, can reduce the load of current eNB, make the load relative equilibrium between current eNB and adjacent other eNB.
Below in conjunction with Figure of description the embodiment of the invention is described in detail.
As shown in Figure 2, for carrying out the step schematic diagram of link switchover in the embodiment of the invention one between eNB, in present embodiment one, switch to the load balancing that target eNB realizes each eNB by RRU data link with source eNB, in each embodiment, source eNB is relative with target eNB, promptly when an eNB need switch, this eNB just becomes source eNB, and the eNB adjacent with source eNB just may become the target eNB of this source eNB.
The method of present embodiment one comprises the steps:
Step 101: source eNB detects the load of self, judges whether to satisfy switching condition, if satisfy switching condition, then jumps to step 102; Otherwise, continue the load of self is detected.
The resource of eNB generally includes interface-free resources, hardware handles resource and backhaul bandwidth resources, and this three classes resource has all reflected the load state of eNB, and therefore, the load of eNB can be by measuring the operating position of above three kinds of resources.For example: source eNB can detect the Backhaul bandwidth resources that whether interface-free resources used surpasses first set point, whether the hardware handles resource used surpasses second set point and used and whether surpass the 3rd set point, when testing result has surpassed corresponding set point at least one resource of having used, just can think that the load of eNB is excessive, switching condition is satisfied in the load of current source eNB.First set point here, second set point and the 3rd set point can be provided with as required, the set point among the different eNB can be identical also can be inequality.
Step 102: source eNB selects one as target eNB from adjacent eNB, and sends the load handoff request to described target eNB.
Comprise at least one the RRU data link sign among the eNB of source in the load handoff request in this step, the RRU data link that notification target eNB is to be switched, just notification target eNB wishes the load capacity switched, the sign that simultaneously can also carry source eNB in the load handoff request is used for the source eNB relevant information that notification target eNB initiates the load handoff request.
Can be between adjacent eNB by the mutual load information separately of X2 interface, the load information here can comprise the operating position of interface-free resources, hardware handles resource and backhaul bandwidth resources.Source eNB is according to the load information of adjacent eNB, determine the less adjacent eNB of load (determining that according to load information the eNB that does not satisfy switching condition can be regarded as the less eNB of load), if it is a plurality of that the less adjacent eNB of load has, then can therefrom select one as target eNB.
Step 103: target eNB need to determine the load capacity of switching according to the sign of the RRU data link in the load handoff request.
Step 104: target eNB judges whether the load of self and the load sum of to be switched RRU data link satisfy switching condition, and as not satisfying, then execution in step 105; Otherwise target eNB is returned the rejection response message to source eNB, stops handoff procedure.
In step 102, though the load of the target eNB that source eNB determines is less, but after considering that RRU switches, the load of target eNB increases, switching condition may be satisfied in load after the increase, therefore, target eNB also will roughly be estimated the load of to be switched RRU data link before agree switching, and can support the load of self and the load sum of to be switched RRU data link to guarantee target eNB.
If in step 102, source eNB estimates that to the load sum of the load of target eNB and to be switched RRU data link determine the load after target eNB can be supported to switch, then step 103 and step 104 can be not necessary in advance.
If whether different eNB satisfies the judgment mode difference of switching condition to load, as different eNB varying in size to the 3rd set point setting of second set point of first set point of interface-free resources correspondence, hardware handles resource correspondence and Backhaul bandwidth resources correspondence, then in step 103 and the step 104, target eNB can be estimated the load after switching further.
Step 105: target eNB is returned the permission switching response message to source eNB.
Step 106: source eNB switches to target eNB with the corresponding RRU data link of RRU data link sign.
By the scheme of step 101 to step 106, fractional load among the eNB of source is migrated to target eNB, reduced the load capacity among the eNB of source, the resource of syndicated feeds eNB and target eNB provides voice and packet data concurrent service for a large amount of UE, avoid the resource free time of resource overload and target eNB among the eNB of source, improved overall performance of network.
After the RRU data link is switched, can jump to step 101, again whether the state of load is satisfied switching condition by source eNB and judge, if still satisfy switching condition, the load capacity deficiency of this switching is described, source eNB still is on the alert, and need proceed RRU and switch; If do not satisfy switching condition, this handover success is described make source eNB return to safe condition by the state of alert.
Again each step of the embodiment of the invention one is described below.
In the embodiment of the invention one, can be mutually between adjacent eNB mutual load information separately, if the mode difference of load information interaction, the then mutual time point that takes place is also different, and the embodiment of the invention one includes but not limited to the interactive mode of following two kinds of load informations:
1, periodically mutual.Periodically be meant the regularly mutual load information separately of adjacent eNB alternately, when switching condition is satisfied in the load of a certain eNB detection self, this eNB becomes source eNB, determines that according to mutual load information of the last time the less adjacent eNB of load capacity is as target eNB.
Utilize periodically interactive mode, can make source eNB use the shortest time to determine target eNB, reduced the response time of switching.
2, the poll formula is mutual.The poll formula is meant alternately that when switching condition is satisfied in the load of source eNB detection self initiatively send the load query request to adjacent eNB, the resource operating position of poll adjacent eNB is selected suitable load migration target eNB.
The poll formula can reduce interactive signaling expense between eNB alternately.
In order to make source eNB can under the situation of the shortest time and signaling consumption, determine target eNB and to be switched RRU data link, can in eNB, safeguard and the relevant information table of adjacent eNB, be referred to as load association status table, as shown in table 1.
| The adjacent eNB sign | Adjacent R RU sign |
Table 1
Load association status table among eNB can comprise two category informations, is respectively that adjacent other eNB signs with this eNB and adjacent R RU identify.An adjacent eNB supposing current eNB is designated A, then the expression of adjacent R RU sign: link to each other and simultaneously adjacent with the eNB that is designated A RRU with current eNB.In the present embodiment, the RRU adjacent with eNB can indicate and this eNB between distance be not more than the RRU of setting threshold.For example: current eNB has 5 RRU, wherein there is the distance of two RRU to be not more than setting threshold with the eNB distance that is designated A, can think that then these two RRU are RRUs adjacent with the eNB that is designated A, further, can also with the nearest RRU of the eNB that is designated A as adjacent RRU.
After each switching is finished, the source eNB and the target eNB that participate in switching will be upgraded the load association status table of self preserving.
When a certain eNB becomes source eNB, can be after determining target eNB, inquiry can identify to the RRU that target eNB is switched from table 1, sends the load handoff request that comprises at least one the RRU data link sign that inquires to target eNB then.
Further, source eNB can be placed on the part or all of RRU sign that inquires in the table 1 in the load handoff request, and the practical operation method includes but not limited to following dual mode:
1, source eNB determines the quantity of the RRU data link that target eNB can receive according to the load information of target eNB, and then the number that is carried at the RRU data link sign in the load handoff request is not more than the quantity of the RRU data link that target eNB can receive.
The manner can guarantee that target eNB has the ability of the RRU data link after handle switching, and avoids because target eNB can't receive the problem that the RRU data link after the switching causes handoff procedure to be made mistakes.
2, after source eNB pre-estimates and switches what RRU data link, can make the load of source eNB return to safe condition by the state of alert.For example: the interface-free resources of source eNB takies quantity and surpasses first set point, hardware handles resource and backhaul bandwidth resources do not surpass corresponding set point, further determine that interface-free resources surpasses the stock number of first set point part, and estimate to switch that two RRU data link can make interface-free resources takies quantity less than first set point; Then, after source eNB determines target eNB, inquire 3 corresponding RRU signs from table 1, at this moment, source eNB can be placed on two RRU signs wherein in the load handoff request and send to target eNB.
The manner can reduce the handoff request number of times, by less handoff request number of times the load of source eNB is reduced.
3, source eNB can be after determining target eNB, from table 1, inquire 3 corresponding RRU signs, but the each less RRU sign (as placing a RRU sign) of only in the load handoff request, placing of eNB, behind handover success, if the load of eNB is still bigger, then continue to switch two RRU that do not switch of residue.
The manner can reduce source eNB to be calculated the estimation of targeted loads, the easy operation of source eNB.
In the step 106 of embodiment one, the switching flow that the RRU data link that source eNB is corresponding with RRU data link sign switches to target eNB may further comprise the steps as shown in Figure 3:
Steps A: source eNB sends the RRU handoff request to target eNB, comprises in the described RRU handoff request: source eNB sign, RRU data link sign and the data relevant with UE connect contextual information.
It is source eNB that source eNB sign is used for the initiating terminal that notification target eNB switches, to be switched RRU data link is the RRU of source eNB, the data relevant with UE connect contextual information and comprise SAE Bearer and QoS, Deng the UE relevant information that is used to indicate the to be switched RRU service of target eNB, do not interrupt so that switch back UE business.
Can further include the data link information relevant with core net (EPC) in the RRU handoff request, this information can help target eNB directly upstream data to be sent to EPC in the future.
Step B: after target eNB receives the RRU handoff request, reply acknowledge message to source eNB.
The sign and the cell ID that can comprise target eNB in the described acknowledge message, target eNB is agreed the SAE Bearer list of reception.If target eNB is disagreed with reception, then also comprise SAE Bearer list that disagrees with reception and the reason of disagreeing with reception in the acknowledge message.
Step C: in the RRU data link carrying that source eNB is corresponding with RRU data link sign/downlink data sends to target eNB.
With in the carrying of the RRU data link of buffer memory/purpose that downlink data sends to target eNB is: after switching, target eNB can according in the carrying of RRU data link/downlink data continuity RRU data link loaded service.
Step D: target eNB is by path handoff request message, and request EPC upgrades the data link information relevant with described RRU data link.
Comprise in the handoff request message of path: target eNB according to source eNB sign, RRU data link sign, the data connection contextual information relevant and RRU data link with UE carry on/downlink data.
Step e: EPC upgrades the data link information relevant with described RRU data link, with the RRU data link as the RRU data link in the target eNB.
After EPC finishes renewal, the reverse-path switching request acknowledgement message.
Step F: target eNB notification source eNB discharges the corresponding RRU data link of RRU data link sign.
Simultaneously, target eNB also triggers source eNB release RRU Radio Resource and the control plane resource relevant with UE.
By the scheme of steps A to step F, the RRU data link switches to target eNB by source eNB, and after step F, the data of RRU just can be carried out the up-downgoing transmission by target BS.
The scheme of the embodiment of the invention one is to switch at the RRU in the distributed base station to realize load migration, because each RRU need be responsible for the radio frequency processing of a plurality of contained fans, therefore, RRU of every switching, load change amount to source eNB is bigger, the scheme of embodiment one can be regarded as a kind of load migration of coarseness.Under some scene, though source eNB has satisfied switching condition, actual load is also few above the load that source eNB can support, therefore, the embodiment of the invention two has proposed a kind of fine-grained load migration, and soon among the eNB of source and UE that be positioned at source eNB and target eNB edge switches to target eNB.Fine-grained load migration is unit with UE, owing to be positioned at the UE limited amount at source eNB and target eNB edge, therefore, fine granularity load migration of every execution can only be finished the transfer of small loading, has guaranteed the precision of load migration quantity.
As shown in Figure 4, for realizing the step schematic diagram of fine granularity link switchover between eNB in the embodiment of the invention two, this method may further comprise the steps:
Step 201: source eNB detects the load of self, judges whether to satisfy switching condition, if satisfy switching condition, then jumps to step 202; Otherwise, continue the load of self is detected.
This step is identical with the step 101 of embodiment one.
Step 202: source eNB selects one as target eNB from adjacent eNB, and sends the load handoff request to described target eNB.
Comprise at least one terminal iidentification in the load handoff request in this step, the UE of described terminal iidentification correspondence is the UE of access source eNB, and is positioned at the scope that target eNB covers.
In present embodiment two, the UE that switches is the UE that is positioned at eNB edge, source, because in cellular communication system, some is overlapping for the coverage of adjacent eNB, therefore, the UE at edge refers to an access source eNB, but is positioned at the overlapping region of target eNB and source eNB coverage.
Step 203: target eNB need to determine the load capacity of switching according to the quantity of the terminal iidentification in the load handoff request.
Step 204: target eNB judges whether the load of self and the load sum of to be switched terminal satisfy switching condition, and as not satisfying, then execution in step 205; Otherwise target eNB is returned the rejection response message to source eNB, stops handoff procedure.
Step 205: target eNB is returned the permission switching response message to source eNB.
Step 206: source eNB switches to target eNB with the terminal of terminal iidentification correspondence.
In step 206, source eNB implements to realize the terminal switching to the Handover of target eNb flow process to UE.
After step 206, can jump to step 201, continue load condition is detected.If load is still excessive, the handoff procedure that can initiate terminal again.
In present embodiment two, can under the situation of the shortest time and signaling consumption, determine target eNB and to be switched terminal in order to make source eNB, can in eNB, safeguard the load association status table with adjacent eNB, as shown in table 2.
| The adjacent eNB sign | The adjacent end sign |
Table 2
Different is with table 1, and the load association status table in the present embodiment two can comprise two category informations, is respectively that adjacent other eNB signs with eNB and adjacent end identify.An adjacent eNB supposing current eNB is designated A, then adjacent end sign expression: insert current eNB, but be positioned at the UE of current eNB and the overlapping scope of the eNB overlay area that is designated A.Because UE is in mobile status mostly and the switching by RRU also can cause some UE to be switched to adjacent eNB, therefore, adjacent end sign in the table 2 wants Dynamic Maintenance to upgrade, after each switching is finished, the source eNB and the target eNB that participate in switching also will be upgraded the load association status table of self preserving.
The method of the embodiment of the invention two both had been applicable to the situation of distributed base station, also was applicable to the situation of existing other base stations.
Both needing that more load is migrated to purpose eNB by source eNB, again need be in the load migration process under the situation of precision of proof load migration quantity, the embodiment of the invention three has proposed link switch-over method between a kind of eNB that the load migration and the fine-grained load migration of coarseness are combined, its step may further comprise the steps as shown in Figure 5:
Step 301: source eNB detects the load of self, judges whether to satisfy switching condition, if satisfy switching condition, then jumps to step 302; Otherwise, continue the load of self is detected.
This step is identical with the step 101 of embodiment one.
Step 302: source eNB selects one as target eNB from adjacent eNB, and sends the first load handoff request to described target eNB.
Comprise at least one the RRU data link sign among the eNB of source in the first load handoff request in this step, the RRU data link that notification target eNB is to be switched.The corresponding RRU data link of RRU data link sign in the first load handoff request is the data link adjacent with target eNB.
Step 303: source eNB selects one as target eNB from adjacent eNB, and sends the second load handoff request to described target eNB.
Comprise at least one terminal iidentification in the second load handoff request in this step, the UE of described terminal iidentification correspondence is the UE of access source eNB, and is positioned at the scope that target eNB covers.
In present embodiment three, the target eNB that relates in step 302 and the step 303 can be identical eNB, can be different eNB also, that is to say that RRU data link and UE can switch to same target eNB, also can switch to different target eNB.
For example: in eNB, can safeguard the load association status table with adjacent eNB, as shown in table 3.
| The adjacent eNB sign | Adjacent R RU sign | The adjacent end sign |
Table 3
Load association status table in the present embodiment three can comprise three category informations, is respectively adjacent other eNB signs with eNB, adjacent R RU sign and adjacent end sign.An adjacent eNB supposing current eNB is designated A, then adjacent end sign expression: insert current eNB, but be positioned at the UE of current eNB and the overlapping scope of the eNB overlay area that is designated A; Adjacent R RU identifies expression: link to each other with current eNB and simultaneously adjacent with the eNB that is designated A RRU.
If source eNB is excessive in load, two RRU data link and two UE need be switched to target eNB, and source eNB can be according to the load information of each adjacent eNB and the information in the table 3, can find such target eNB, corresponding at least 2 the adjacent R RU sign of this target eNB correspondence and 3 adjacent end signs, then eNB definite target eNB in step 302 and step 303 in source is same eNB; Can not carry out the target eNB that RRU switches and UE switches simultaneously if source eNB finds, then source eNB can utilize two target eNB to carry out RRU switching and UE switching respectively.
Suppose in the present embodiment three that source eNB can find and can carry out the target eNB that RRU switches and UE switches simultaneously, the first load handoff request and the second load handoff request can be same request messages, also can be different request messages.
Step 304: target eNB need to determine the load capacity of switching according to the terminal iidentification in the sign of the RRU data link in the first load handoff request and the second load handoff request.
Step 305: target eNB judges whether load of self and to be switched load sum satisfy switching condition, and as not satisfying, then execution in step 306; Otherwise target eNB is returned the rejection response message to source eNB, stops handoff procedure.
Because the source eNB of hypothesis present embodiment three switches RRU switching and UE to target eNB in the step 303, so target eNB needs confirm the load of RRU and the load of UE simultaneously.If source eNB switches RRU and UE respectively by two target eNB, then each target eNB needs respectively the load of to be switched link to be confirmed.
Step 306: target eNB is returned the permission switching response message to source eNB.
Step 307: the RRU data link that source eNB is corresponding with RRU data link sign and the terminal of terminal iidentification correspondence switch to target eNB.
After step 307, can jump to step 301, judge once more whether the load of source eNB is excessive, if load still is excessive, can re-executes RRU and/or terminal and switch.
Link switch-over method between three kinds of eNB that provide by the embodiment of the invention one, two and three, can select coarseness or fine-grained link switchover according to actual needs, or link switchover thick, the fine granularity combination, solve eNB effectively and caused the problem of transshipping because of increasing of burst service amount, the resource of a plurality of eNB is condensed together, for UE as much as possible provides service, cause the serious problems such as service disconnection of UE in the sub-district when both having avoided the load of eNB excessive; And the wasting of resources that causes when the load of eNB is too small has improved the whole Business Processing efficient of a plurality of eNB in the Access Network.
The embodiment of the invention four also provides the system of link switchover between a kind of eNB, as shown in Figure 6, described system comprises an eNB 11 and two eNB 12 adjacent with an eNB at least, wherein: an eNB 11 is used for when the state of self load satisfies switching condition, send the first load handoff request to the 2nd eNB 12, comprise at least one the RRU data link sign among the eNB11 in the described first load handoff request, and, when receiving the permission switching response message that the 2nd eNB12 returns, the corresponding RRU data link of described RRU data link sign is switched to the 2nd eNB12; The 2nd eNB12 is used for returning the permission switching response message to an eNB11 when receiving the first load handoff request.
A described eNB11 also is used for initiating the second load handoff request to the 2nd eNB12, comprise at least one terminal iidentification in the described second load handoff request, the UE of described terminal iidentification correspondence is the UE that inserts an eNB, and be positioned at the scope that the 2nd eNB covers, and when receiving the permission switching response message that the 2nd eNB returns, the UE of described terminal iidentification correspondence is switched to the 2nd eNB12.
The a plurality of adjacent eNB that also comprise an eNB11 in the described system, then an eNB11 is used for periodically receiving the load information of a plurality of adjacent eNB, when determining at least one adjacent eNB that does not satisfy switching condition according to the load information that receives, with one in the adjacent eNB of determining as the 2nd eNB12; Perhaps, an eNB11 is used for sending the load query request to a plurality of adjacent eNB, when the load information that returns according to each adjacent eNB is determined at least one adjacent eNB that does not satisfy switching condition, with one in the adjacent eNB of determining as the 2nd eNB12.
Described the 2nd eNB12 is used for determining the load and the load sum of to be switched RRU data link when not satisfying switching condition of self, returns the permission switching response message to an eNB11.
The quantity of the 2nd eNB in the present embodiment four is at least one, and wherein: the 2nd eNB that receives the first load handoff request is identical eNB with the 2nd eNB that receives the second load handoff request, or different eNB.
ENB in the present embodiment is source eNB when needs switch, and is target eNB when other adjacent eNB need switch.
The embodiment of the invention five also provides a kind of evolution base station, as shown in Figure 7, described evolution base station comprises: switching condition detection module 21, first request sending module 22, handover module 23 and request receiver module 24, and wherein: whether the state that switching condition detection module 21 is used to detect self load satisfies switching condition; It is the state of load when satisfying switching condition that first request sending module 22 is used in testing result, sends the first load handoff request to other evolution base stations, comprises at least one the RRU data link sign of self in the described first load handoff request; Handover module 23 is used for when receiving the permission switching response message, and the corresponding RRU data link of described RRU data link sign is switched to other evolution base stations; Request receiver module 24 is used to receive the load handoff request that other evolution base stations send, and comprise at least one RRU data link sign of other evolution base stations in the described load handoff request, and the RRU data link of RRU data link sign correspondence is adjacent with self.
Evolution base station also comprises second request sending module 25, in testing result is that the state of load is when satisfying switching condition, send the second load handoff request to other evolution base stations, comprise at least one terminal iidentification in the described second load handoff request, the UE of described terminal iidentification correspondence is the UE that inserts evolution base station, and is positioned at the scope that other evolution base stations cover; Described handover module 23 also is used for the UE of described terminal iidentification correspondence is switched to other evolution base stations.
Described switching condition detection module 21 comprises that resource determines submodule 31 and detection sub-module 32, and wherein: resource determines that submodule 31 is used for determining interface-free resources, hardware handles resource of self having used of having used and the Backhaul bandwidth resources of having used; Detection sub-module 32 is used for when following condition at least a satisfied, the state of determining self load satisfies switching condition: the hardware handles resource that the interface-free resources of having used surpasses first set point, used surpasses second set point and the Backhaul bandwidth resources used surpass when at least one condition satisfies in the 3rd set point, and whether the state of load satisfies switching condition.
Whether the corresponding RRU data link load sum of RRU data link sign that described switching condition detection module 21 is used for determining the load of self and asks receiver module to receive satisfies switching condition; Then described evolution base station also comprises response message sending module 26, be used for when the load of self is satisfied switching condition with the corresponding RRU data link load sum of RRU data link sign of asking receiver module to receive, returning the permission switching response message to described other evolution base stations.
Evolution base station in the present embodiment five may be that source eNB may be a target eNB also, and also be the adjacent eNB of certain other eNB in Access Network when switching.
The method, system and the evolution base station that provide by the embodiment of the invention, realize interface-free resources between the adjacent eNB, handled sharing of resource and return bandwidth resource, utilize fine granularity load balancing (UE switching) and two kinds of schemes of coarseness load balancing (RRU switching), can reasonable disposition BTS hardware resource, effectively avoid the part overloaded base stations that causes because of the bursts of traffic amount; By cooperating with each other between eNB, avoid the idle or overload of resource, realize the load dynamic migration effectively, improve the whole efficiency of Internet resources.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (17)
1. the method for link switchover between an evolution base station eNB is characterized in that described method comprises:
When source eNB satisfies switching condition at the state of self load, send the first load handoff request, comprise at least one the remote radio unit (RRU) RRU data link sign among the eNB of source in the described first load handoff request to adjacent target eNB;
Source eNB switches to target eNB with the corresponding RRU data link of described RRU data link sign when receiving the permission switching response message that target eNB returns.
2. the method for claim 1 is characterized in that,
The RRU and the target eNB of described RRU data link sign correspondence are adjacent.
3. the method for claim 1 is characterized in that, source eNB is after the state of load satisfies switching condition, and described method also comprises:
Source eNB initiates the second load handoff request to target eNB, comprises at least one terminal iidentification in the described second load handoff request, and the UE of described terminal iidentification correspondence is the UE of access source eNB, and is positioned at the scope that target eNB covers;
Source eNB switches to target eNB with the UE of described terminal iidentification correspondence when receiving the permission switching response message that target eNB returns.
4. as claim 1 or 3 described methods, it is characterized in that when at least a in the following condition satisfied, source eNB determined that the state of self load satisfies switching condition:
Source eNB determines that the interface-free resources self used surpasses first set point, the hardware handles resource used surpasses second set point and the Backhaul bandwidth resources used surpass the 3rd set point.
5. as claim 1 or 3 described methods, it is characterized in that source eNB is before target eNB is initiated the first load handoff request, described method also comprises:
Source eNB periodically receives the load information of a plurality of adjacent eNB, when determining at least one adjacent eNB that does not satisfy switching condition according to the load information that receives, with one in the adjacent eNB of determining as target eNB; Perhaps,
Source eNB sends the load query request to a plurality of adjacent eNB, when the load information that returns according to each adjacent eNB is determined at least one adjacent eNB that does not satisfy switching condition, with one in the adjacent eNB of determining as target eNB.
6. as claim 1 or 3 described methods, it is characterized in that,
After target eNB receives the first load handoff request, determine the load and the load sum of to be switched RRU data link when not satisfying switching condition of self, return the permission switching response message to source eNB.
7. the method for claim 1 is characterized in that, source eNB switches to target eNB with the corresponding RRU data link of described RRU data link sign, comprising:
Source eNB sends the RRU handoff request to target eNB, comprises in the described RRU handoff request: source eNB sign, RRU data link sign and the data relevant with UE connect contextual information;
After source eNB receives the affirmation message that target eNB returns, in the RRU data link carrying that RRU data link sign is corresponding/downlink data sends to target eNB;
Target eNB according to source eNB sign, RRU data link sign, the data relevant with UE connect contextual information and the carrying of RRU data link on/downlink data, ask the EPC renewal data link information relevant with described RRU data link;
Target eNB is after the relevant data link information renewal of described RRU data link is finished, and notification source eNB discharges the corresponding RRU data link of RRU data link sign.
8. as claim 1 or 3 described methods, it is characterized in that,
The quantity of described target eNB is at least one, and wherein: the target eNB that receives the first load handoff request is identical eNB with the target eNB that receives the second load handoff request, or different eNB.
9. the system of link switchover between an eNB is characterized in that described system comprises an eNB and two eNB adjacent with an eNB, wherein:
The one eNB, be used for when the state of self load satisfies switching condition, send the first load handoff request to the 2nd eNB, comprise at least one the RRU data link sign among the eNB in the described first load handoff request, and, when receiving the permission switching response message that the 2nd eNB returns, the corresponding RRU data link of described RRU data link sign is switched to the 2nd eNB;
The 2nd eNB is used for returning the permission switching response message to an eNB when receiving the first load handoff request.
10. system as claimed in claim 9 is characterized in that,
A described eNB, also be used for initiating the second load handoff request to the 2nd eNB, comprise at least one terminal iidentification in the described second load handoff request, the UE of described terminal iidentification correspondence is the UE that inserts an eNB, and be positioned at the scope that the 2nd eNB covers, and when receiving the permission switching response message that the 2nd eNB returns, the UE of described terminal iidentification correspondence is switched to the 2nd eNB.
11. as claim 9 or 10 described systems, it is characterized in that, also comprise a plurality of adjacent eNB of an eNB in the described system, then
The one eNB is used for periodically receiving the load information of a plurality of adjacent eNB, when determining at least one adjacent eNB that does not satisfy switching condition according to the load information that receives, with one in the adjacent eNB of determining as the 2nd eNB; Perhaps,
The one eNB is used for sending the load query request to a plurality of adjacent eNB, when the load information that returns according to each adjacent eNB is determined at least one adjacent eNB that does not satisfy switching condition, with one in the adjacent eNB of determining as the 2nd eNB.
12. system as claimed in claim 10 is characterized in that,
Described the 2nd eNB is used for determining self the load and the load sum of to be switched RRU data link when not satisfying switching condition, returns the permission switching response message to an eNB.
13. system as claimed in claim 10 is characterized in that,
The quantity of described the 2nd eNB is at least one, and wherein: the 2nd eNB that receives the first load handoff request is identical eNB with the 2nd eNB that receives the second load handoff request, or different eNB.
14. an evolution base station is characterized in that, described evolution base station comprises:
The switching condition detection module, whether the state that is used to detect self load satisfies switching condition;
First request sending module, being used in testing result is the state of load when satisfying switching condition, sends the first load handoff request to other evolution base stations, comprises at least one the RRU data link sign of self in the described first load handoff request;
Handover module is used for when receiving the permission switching response message, and the corresponding RRU data link of described RRU data link sign is switched to other adjacent evolution base stations;
The request receiver module, be used to receive the load handoff request that other adjacent evolution base stations send, at least one the RRU data link sign that comprises other evolution base stations in the described load handoff request, and the RRU data link of RRU data link sign correspondence is adjacent with self.
15. evolution base station as claimed in claim 14 is characterized in that, described evolution base station also comprises:
Second request sending module, in testing result is that the state of load is when satisfying switching condition, send the second load handoff request to other evolution base stations, comprise at least one terminal iidentification in the described second load handoff request, the UE of described terminal iidentification correspondence is the UE that inserts evolution base station, and is positioned at the scope that other evolution base stations cover;
Described handover module also is used for the UE of described terminal iidentification correspondence is switched to other evolution base stations.
16. evolution base station as claimed in claim 14 is characterized in that, described switching condition detection module comprises:
Resource is determined submodule, is used for determining interface-free resources, hardware handles resource of self having used of having used and the Backhaul bandwidth resources of having used;
Detection sub-module is used for when following condition at least a satisfied, and determines that the state of self load satisfies switching condition:
The hardware handles resource that the interface-free resources of having used surpasses first set point, used surpasses second set point and the Backhaul bandwidth resources used surpass when at least one condition satisfies in the 3rd set point, and whether the state of load satisfies switching condition.
17. evolution base station as claimed in claim 14 is characterized in that,
Described switching condition detection module, whether the corresponding RRU data link load sum of RRU data link sign that is used for determining the load of self and asks receiver module to receive satisfies switching condition;
Described evolution base station also comprises:
The response message sending module is used for returning the permission switching response message to described other evolution base stations when the load of self is satisfied switching condition with the corresponding RRU data link load sum of RRU data link sign of asking receiver module to receive.
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