CN101072391A - Wireless evolution network base station and method for interacting load information between base stations - Google Patents
Wireless evolution network base station and method for interacting load information between base stations Download PDFInfo
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- CN101072391A CN101072391A CNA2006100796685A CN200610079668A CN101072391A CN 101072391 A CN101072391 A CN 101072391A CN A2006100796685 A CNA2006100796685 A CN A2006100796685A CN 200610079668 A CN200610079668 A CN 200610079668A CN 101072391 A CN101072391 A CN 101072391A
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Abstract
When link data are lost, the invention can raise validity of information of load in base station (BS). When first BS sends the report of load to the adjacent second BS, besides containing information of current load, the report of load also contains the information of acceptance when first BS receives report of load from second BS lately. When receiving report of load from first BS, if information of acceptance is accorded with condition defined in advance, then second BS sends current report of load to first BS. After receiving report of load from adjacent second BS, if not receiving new report of load from second BS within prearranged length of time, then first BS requests current report of load of second BS forwardly.
Description
Technical field
The present invention relates to moving communicating field, particularly wireless evolution network.
Background technology
Universal mobile telecommunications system (Universal Mobile Telecommunications System, be called for short " UMTS ") be (the European Standards Institute of ETSI European Telecommunications Standards Institute, be called for short " ETSI ") propose, be intended to be smoothly transitted on global system for mobile communications (Global System for mobile Communication is called for short " the GSM ") network foundation solution of 3G (Third Generation) Moblie.
Because UMTS adopts Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division MultipleAccess is called for short " WCDMA ") air interface technologies, therefore, also the UMTS system is called the WCDMA communication system usually.As shown in Figure 1, the UMTS system has adopted and the similar structure of second generation mobile communication system, by such as cell phone, portable computer, the subscriber equipment of vehicular phone and so on (User Equipment, be called for short " UE "), be responsible for to handle universal mobile telecommunications system grounding wireless access network (the UMTS Terrestrial Radio Access Network of all and wireless function associated, be called for short " UTRAN "), and be responsible for to handle that all voice calls are connected with data in the UMTS system, and the core net of the exchange of realization and external network and routing function (Core Net is called for short " CN ") constitutes.
Wherein CN is from being divided into circuit switching (Circuit Switching is called for short " CS ") territory and packet switching (Packet Switching is called for short " PS ") territory in logic.CN is mainly by Serving GPRS Support Node (Service GPRS Support Node, be called for short " SGSN "), (the Mobile Switching Center/Visitor Location Register of mobile switching centre/visitor's location register, be called for short " MSC/VLR "), attaching position register (Home Location Register, be called for short " HLR "), Gateway GPRS Support Node (Gateway GPRS Support Node, be called for short " GGSN "), mobile switching centre's gateway (Gateway Mobile Switching Center is called for short " GMSC ") constitutes.Wherein, MSC/VLR, GMSC belong to circuit commutative field CS, and SGSN, GGSN belong to packet-switched domain PS, and HLR belongs to circuit commutative field CS and the total functional node of packet-switched domain PS.The external network that links to each other with CN comprises internet (Internet) and public switched telephone network (Public SwitchedTelephone Network, be called for short " PSTN ") and integrated services digital network (IntegratedServicesDigital Network is called for short " ISDN ") etc.
And UTRAN comprises one or several RNS (Radio Network Subsystem is called for short " RNS ").As shown in Figure 2, each RNS is made up of a radio network controller (Radio NetworkController is called for short " RNC ") and one or more base-station node (Node Base Station is called for short " NodeB ").Wherein, be connected by the Iu interface between RNC and the CN; NodeB is connected by Iub interface with RNC; Connect by the Iur interface between the RNC, the Iur interface can connect by the connection of the direct physical between the RNC or by transmission network to be realized.
In said structure, RNC is responsible for distributing and is attached thereto with control or the Radio Resource of relevant NodeB, in other words, promptly be responsible for the Radio Resource of control UTRAN, mainly finish functions such as connection foundation and disconnection, switching, the merging of grand diversity, RRM control.
NodeB then is responsible for finishing the conversion of the data flow between Iub interface and the Uu interface, also participates in a part of RRM simultaneously.Specifically, it comprises radio receiving-transmitting unit and Base-Band Processing parts, as mentioned above, by the Iub interface and the RNC interconnection of standard, mainly finishes the processing of Uu interface physical layer protocol.Its major function is spread spectrum, modulation, chnnel coding and despreading, demodulation, channel-decoding, also comprises the functions such as mutual conversion of baseband signal and radiofrequency signal.
The above network architecture is based on third generation partner program (3rd Generation PartnershipProject, abbreviation " 3GPP ") framework of version before the R6, consider the competitiveness of future network, 3GPP is studying a kind of brand-new evolution network framework to satisfy the application demand of mobile network in 10 years futures even longer time, comprises the Long Term Evolution of System Architecture Evolution and Access Network.The Access Network of evolution is called E-UTRAN in Long Term Evolution (Long Term Evolution is called for short " LTE ") system.The target of network evolution is to be desirable to provide a kind of low time delay, high data rate, high power system capacity and covering, low cost, complete IP-based network.Owing to be a kind of brand-new network architecture, substantial variation all will take place in all nodes, function and the flow process of therefore existing framework.
In evolvement network,, need report loading condition separately mutually between each adjacent base station in order to realize realizing better mobile management.Such as, when carrying out the minizone handover decisions, need consider the loading condition of adjacent sub-district, to improve quality of handoff.Therefore, the load report mechanism of minizone is a critical function of RRM.
The load report mechanism of minizone has following several method:
1. periodically
2. Event triggered
3. in other signalings, carry transmission
4. active request
5. initiatively send
No matter which kind of load report mechanism is the common recognition of having reached at present be, its signaling traffic load that brings is all very light, is not the problem that needs are considered therefore, and based on above-mentioned common recognition, the simplest load report mechanism is the periodic report mode.Periodic load report mechanism only needs to dispose parameter, i.e. a reporting period.
In periodic load report mechanism, the base station is reporting period of its each adjacent base station configuration, and periodically sends the load information report to corresponding adjacent sub-district with this Configuration Values, and its process as shown in Figure 3.
The base-station node 1 of evolution sends load report to its adjacent evolution base station node 2 constantly at T1, and behind one-period T, at T1+T constantly just, sends load report to its adjacent evolution base station node 2 once more.Similarly, the base-station node 2 of evolution sends load report to its adjacent evolution base station node 1 constantly at T2, and behind one-period T ', at T2+T ' constantly just, sends load report to its adjacent evolution base station node 1 once more.
In actual applications, there is following problem in such scheme: when load report is lost on data link, can cause the validity of load information to reduce.
Cause the main cause of this situation to be, base-station node can't know whether this base station loses to the load report that adjacent base station sends in data link.Such as, as shown in Figure 3, the base-station node 1 of evolution at T1 constantly after its adjacent evolution base station node 2 sends load report, even this load report is lost in data link, after base-station node 1 will be waited for one-period T, constantly just, send load report to its adjacent evolution base station node 2 once more at T1+T.Yet load information needs certain real-time, and is promptly effective in a period of time, if the load information of current adjacent base station is to obtain before the long period, this information does not have too many value.Therefore, for base-station node 2, between the T3 ' moment, the load information of the base-station node 1 that base-station node 2 is kept has lower validity at T1 '.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method for interacting load information between base station in a kind of wireless evolution network and base station, makes the validity that can improve the base station load information when link data is lost.
For achieving the above object, the invention provides in a kind of wireless evolution network the method for interacting load information between the base station, comprise following steps:
First base station sends load report to the second adjacent base station, wherein comprises the first base station present load information and first base station receive load report recently from second base station reception condition information;
When second base station is received from the load report of first base station, if the predefined condition of described reception condition information conforms then sends load report to first base station.
Wherein, described reception condition information is the time of reception of the load report that receives from second base station recently of first base station;
To be described time of reception the most proximad send the transmitting time of load report in first base station early than second base station to described predefined condition.
In this external described method, described reception condition information is the most proximad transmitting time of first base station transmission load report of second base station, and this transmitting time is carried at second base station in the load report that first base station sends;
Described predefined condition is that transmitting time in the described reception condition information and second base station the most proximad send the difference of transmitting time of load report greater than predetermined thresholding in first base station.
In this external described method, described reception condition information is the most proximad identification number of the load report of first base station transmission of second base station, and this identification number is carried at second base station in the load report that first base station sends;
Described predefined condition is that the most proximad the identification number of the load report that sends of first base station is different for identification number and second base station in the described reception condition information.
In this external described method, in the load report that first base station sends, comprise the second base station present load information and second base station receive load report recently from first base station reception condition information in second base station;
When first base station is received from the load report of second base station, if the predefined condition of described reception condition information conforms then sends load report to second base station.
In this external described method, described first base station and described second base station periodically send load report mutually.
In this external described method, described cycle time is less than the longest effective time of load information.
In this external described method, also comprise following steps:
When first base station received load report from second base station, the time of reception of record load report if the new load report from second base station is not received in first base station in default duration, then sent the message of request load report to second base station;
When second base station receives the message of request load report, send the current load report in second base station to first base station.
In this external described method, described default duration is second base station sends cycle time from load report to first base station.
In this external described method, when switch for subscriber equipment as source base station decision described base station, the difference of selecting the last time of obtaining the load information report and current time is preferentially selected handover-target base station less than the adjacent base station that presets thresholding in these adjacent base stations.
In this external described method, if the time that described source base station can't obtain load information report in the last time and the difference of current time find target BS in less than the adjacent base station that presets thresholding, then other adjacent base station to this source base station sends the message of asking load report;
Described other adjacent base station is responded load report to described source base station;
The load report that described source base station is responded according to described other adjacent base station selects corresponding target BS to switch.
The present invention also provides the base station in a kind of wireless evolution network, comprises:
Sending module is used for sending load report to adjacent base station, wherein comprises this base station present load information and this base station receive load report recently from this adjacent base station reception condition information;
Receiver module is used to receive the load report from adjacent base station;
Judge module, whether the reception condition information of the load report that is used for judging that described receiver module is received meets predefined condition, if then indicate described sending module to send load report to described adjacent base station.
Wherein, also comprise:
Timer, be used for when the load report of receiving from adjacent base station, starting,, then restart if before overtime, receive new load report from this adjacent base station, if overtime incident takes place, then indicate described sending module to send load report to this adjacent base station.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, in first base station when its second adjacent base station sends load report, this load report is interior except comprising the present load information of this first base station, also comprise this first base station receives load report recently from this second base station reception condition information, when load report from this first base station is received in this second base station, if the predefined condition of reception condition information conforms then sends current load report to this first base station.Because second base station can learn that first base station receives the situation of the load report of this base station transmission, when having guaranteed that load report is lost in transmission course, first base station can receive the present load report of second base station as soon as possible, thereby resisted the loss situation of link data preferably, improved the validity of base station load information.
Can represent reception condition information in a different manner, and corresponding predefine condition is set, as: when reception condition information be first base station recently when second base station receives the time of reception of load report, can be time of reception the most proximad send the transmitting time of load report in first base station early than second base station to predefined condition; When reception condition information is when the most proximad first base station sends the transmitting time of load report in second base station, predefined condition can be that transmitting time and second base station in the reception condition information the most proximad sends the difference of transmitting time of load report greater than the thresholding of being scheduled in first base station; When reception condition information is second base station the most proximad during the identification number of the load report that sends of first base station, predefined condition can be that the most proximad the identification number of the load report of first base station transmission is different for identification number and second base station in the reception condition information.These concrete schemes make second base station can set the tolerance of degree that load report is lost flexibly.
Similarly, in second base station in the load report that first base station sends, comprise the second base station present load information and second base station receive load report recently from first base station reception condition information equally, when first base station is received from the load report of second base station, do similarly and handle, make the base station of winning to learn that also second base station receives the situation of the load report of this base station transmission, resist the loss situation of link data between adjacent two base stations further, improved the validity of base station load information.
First base station and second base station periodically send load report mutually, make the present invention program only between existing base station the cycle send in the mechanism of load report, increased this base station receives load report recently from this adjacent base station reception condition information, thereby make that the present invention program's requirement is simple, be easy to realize.
And, since the cycle time that load report sends less than the longest effective time of load information, therefore, the load information that first base station periodically obtains under the normal condition satisfies the validity requirement of load information.Even under the situation that the periodic load report is lost, also can losing of load report be detected and be retransmitted by in load report, adding the method for reception condition information, reduce the periodic load report as much as possible and lose the influence that brings.
After first base station receives load report from the second adjacent base station, if in default duration, do not receive new load report from this second base station, the then present load of this second base station of active request report, make when the two-way link data all go out active between two base stations, still can effectively detect losing of load report, avoid the reduction of load information validity.
When switch for UE as source base station decision first or second base station, preferentially in the effective adjacent base station of load information, select handover-target base station, if can't in these adjacent base stations, find target BS, then initiate the mutual of load report in real time to other adjacent base station of this source base station, and carry out handover decisions, thereby effectively improved success rate for switching according to the load report of receiving.
Description of drawings
Fig. 1 is a UMTS system construction drawing in the prior art;
Fig. 2 is a UTRAN network structure in the prior art;
Fig. 3 is a periodic load information report flow chart between adjacent base station in the prior art;
Fig. 4 is according to sending the load report schematic diagram in the wireless evolution network of first embodiment of the invention between the base station alternately;
Fig. 5 is according to the method flow diagram of interacting load information between the base station in the wireless evolution network of first embodiment of the invention;
Fig. 6 avoids the two-way link loss of data to cause reducing the method flow diagram of load information validity according to first base station in the 4th execution mode of the present invention;
Fig. 7 is according to the base station in the wireless evolution network of sixth embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Core of the present invention is that first base station is periodically comprising the first base station present load information and first base station receive load report recently from this second base station reception condition information in the load report that the second adjacent base station sends.When second base station is received from the load report of first base station, if the predefined condition of reception condition information conforms then sends current load report to first base station.Similarly, in second base station periodically in the load report that first base station sends, comprise the second base station present load information and second base station receive load report recently from first base station reception condition information equally, when first base station is received from the load report of second base station, do similarly and handle, thereby effectively resisted the loss situation of link data between adjacent two base stations, improved the validity of base station load information.
More than principle of the present invention has been carried out simple introduction, below according to this principle in the first execution mode wireless evolution network of the present invention between the base station method of interacting load information be described in detail.
In the present embodiment, the first adjacent base station and second base station periodically send load report mutually, as shown in Figure 4.Wherein, the transmission load report of first base station cycle time T ' with the transmission load report of second base station cycle time T all less than the longest effective time of load information, satisfy the validity requirement of load information to guarantee first and second base station periodically obtains under the normal condition load information.Comprise the current load information in this base station in the load report that is sent, and this base station receives the reception condition information of load report recently from this adjacent base station.Reception condition information is this base station receives load report recently from this adjacent base station time of reception.
Specifically, second base station is adjacent periodic quantity T who sends load report of first base station maintenance, so that periodically send load report to first base station, and, write down the most proximad transmitting time of first base station transmission load report by a variable, wherein, periodic quantity can be passed through network management configuration.
Similarly, first base station also is adjacent periodic quantity T ' who sends load report of second base station maintenance, so that periodically send load report to second base station, this periodic quantity can be passed through network management configuration.Wherein, the load report that is sent is interior except the present load information that comprises this base station, also comprise this base station receives load report recently from this second base station reception condition information, just this base station receives the time of reception of load report recently from this second base station.
After second base station received load report from first base station, the processing of being carried out as shown in Figure 5.
In step 510, the load information in this load report is read in second base station, and does relevant treatment according to this load information.
Then, enter step 520, judge whether the reception condition information in this load report satisfies predefined condition.As mentioned above, first base station in the load report that second base station is sent except the present load information that comprises this first base station, also comprise this first base station receives load report recently from this second base station reception condition information, just this first base station receives the time of reception of load report recently from this second base station, and the transmitting time of first base station transmission load report has write down because second base station has been incited somebody to action the most.Therefore, second base station can be according to the comparative result of the time of reception in this load report and the transmitting time that is write down, judge this base station the most proximad the load report that sends of first base station whether have and lose.That is to say that being time of reception with predefined condition setting the most proximad sends the transmitting time of load report in first base station early than second base station.If satisfy predefined condition, then illustrate this base station the most proximad the load report that sends of first base station lost, directly enter step 540, send current load report to first base station; If do not satisfy predefined condition, that is to say that time of reception is later than or when equaling second base station the most proximad first base station sending the transmitting time of load report, then illustrate this base station the most proximad the load report that sends of first base station do not lose, enter step 530.Because second base station can learn that first base station receives the situation of the load report of this base station transmission, when having guaranteed that load report is lost in transmission course, first base station can receive the present load report of second base station as soon as possible, thereby resisted the loss situation of link data preferably, improved the validity of base station load information.
In step 530, second base station judges whether to reach the cycle time that sends load report to first base station.Specifically, second base station the most proximad first base station starts the timer that duration is T after sending load report, T is second base station sends cycle time from load report to first base station, if this timer expiry then illustrate reaches the cycle time that sends load report to first base station, enter step 540, otherwise continue to wait for.
In step 540, second base station sends current load report to first base station, and resets and periodically send the timer of load report, makes this timer trigger the transmission of load report once more after current time+T.
Correspondingly, in second base station in the load report that first base station sends, comprise the second base station present load information and second base station receive load report recently from first base station reception condition information equally, when first base station is received from the load report of second base station, still be similar to the processing of step 510 to step 540, make the base station of winning to learn that also second base station receives the situation of the load report of this base station transmission, further effectively resist the loss situation of link data between adjacent two base stations, improved the validity of base station load information.
Be not difficult to find, present embodiment cycle between existing base station sends in the mechanism of load report, increased this base station receives load report recently from this adjacent base station reception condition information, and " reissue " load report of having lost according to this reception condition situation, thereby make that the present invention program's requirement is simple, be easy to realize.
In the second execution mode wireless evolution network of the present invention between the base station method and first execution mode of interacting load information roughly the same, its difference only is, in the first embodiment, for second base station, reception condition information in the load report is first base station receives load report recently from second base station time of reception, and to be time of reception the most proximad send the transmitting time of load report in first base station early than second base station to predefined condition.And in the present embodiment, for second base station, reception condition information in the load report is that second base station the most proximad sends the transmitting time (this transmitting time is carried at second base station in the load report that first base station sends) of load report in first base station, and predefined condition is that transmitting time and second base station in the reception condition information the most proximad sends the difference of transmitting time of load report greater than the thresholding of being scheduled in first base station.Make second base station to select whether to allow a small amount of loss situation of load report by the condition that sends current load report is set flexibly.Specifically,, then do not allow to lose any one load report, have only and find to have just losing of load report " to reissue " immediately if predetermined thresholding is 0; If predetermined thresholding is T, then allow to lose a load report, only under the situation that has continuous two load report to lose the report of ability starting load " reissuing ".
In the 3rd execution mode wireless evolution network of the present invention between the base station method and first execution mode of interacting load information roughly the same, its difference only is, it in the 3rd execution mode is the most proximad identification number (this identification number is carried in the load report that sends to first base station by second base station) of the load report that sends of first base station of second base station with the reception condition information setting in the load report, with predefined condition setting is that the most proximad the identification number of the load report that sends of first base station is different for identification number and second base station in the reception condition information, be appreciated that so also and can reach purpose of the present invention.
In the 4th execution mode wireless evolution network of the present invention between the base station method of interacting load information on the basis of first execution mode, increased flow process as shown in Figure 6.
In step 610, the time of reception of this load report is write down in first base station when the load report that receives from second base station.Specifically, first base station is provided with a variable, and record is from the time of reception of the load report of second base station, when the new load report that receives from second base station, upgrades this variable.
Then, enter step 620, the new load report of whether receiving from second base station is judged in first base station in default duration.Specifically, first base station judge the current time with write down recently from the difference of the time of reception of the load report of second base station whether greater than default duration; Perhaps, a timer is set, when first base station receives new load report from second base station, this timer of resetting, and this length of timer is set to default duration, if timer expiry then illustrates the new load report of not receiving from second base station in default duration.Be set to second base station and send cycle time of load report by presetting duration, can judge second base station in this step and whether have loss situation to the load report that this base station sends to first base station.If learn through judgement, the new load report from second base station is not received in this base station in default duration, illustrate that then there is loss situation in second base station to the load report that this base station sends, enter step 630, send the message of request load report to second base station; Otherwise, illustrate that second base station do not lose process ends to the load report that this base station sends.
When second base station receives the message of request load report, send the current load report in second base station to first base station.
Correspondingly, when second base station receives load report from first base station, the time of reception of same record load report if the new load report from first base station is not received in second base station in default duration, then sends the message of request load report to first base station.
When first base station receives the message of request load report, send the current load report in first base station to second base station.Make when the two-way link data all go out active between two base stations, still can effectively detect losing of load report, avoided the reduction of load information validity.
The message of request load report also can replace with load report in the present embodiment, because if before do not receive the load report that adjacent base station periodically sends, then according to the scheme in first execution mode, the load report that send this base station itself also can trigger adjacent base station and send load report.
The method of interacting load information is on the basis of the 4th execution mode between the base station in the 5th execution mode wireless evolution network of the present invention, and having increased by first base station or second base station is the disposition of UE when switching as source base station.
Specifically, when switch for some UE as the source base station decision first base station or second base station, the difference of at first selecting the last time of obtaining the load information report and current time is preferentially selected handover-target base station less than the adjacent base station that presets thresholding in these adjacent base stations.That is to say, preferential select target sub-district in the effective adjacent sub-district of load information, and carry out follow-up normal switching flow.If source base station can't find Target cell in the effective adjacent sub-district of these load informations, then send the message of request load report to other adjacent base station of this source base station.Wherein, the message of request load report can be special request message, also can be the load report of this base station, is judged that load information is expired and is triggered the transmission of load report by the other side.
Other adjacent base station of this source base station is responded load report to this source base station after the message of receiving the request load report.
The load report that this source base station is responded according to other adjacent base station is chosen switching target small area, and carries out follow-up normal switching flow.Source base station by initiating the mutual of load report in real time with other adjacent base station, thereby has effectively improved success rate for switching when switching for UE.
In order to guarantee handover delay, if source base station is not received the response of other adjacent base station in the regular hour, perhaps only receive the response of other adjacent base station of part, then no longer wait for, directly choose switching target small area and switch, perhaps carry out blind switching according to the load report of the response of receiving.
Certainly, aforesaid way also can not be only applicable to need obtain the signaling process of load report information for UE switches applicable to other.
Base station in the 6th execution mode wireless evolution network of the present invention as shown in Figure 7, comprise the sending module that is used for sending to adjacent base station load report in the base station, this load report comprises this base station present load information and this base station receive load report recently from this adjacent base station reception condition information; Be used to receive receiver module from the load report of adjacent base station; And judge module and timer.
Receiver module is when the load report that receives from adjacent base station, start timer, and judge by judge module whether the reception condition information in this load report meets predefined condition, if then indicate sending module to send load report to this adjacent base station.If this timer is received the new load report from this adjacent base station before overtime, then restart, if overtime incident takes place, then indicate sending module to send load report to this adjacent base station.
It is to be noted, introduce for convenience first base station, second base station alleged among the present invention, be not to refer in particular to first base station and second base station, and be meant two arbitrarily selected adjacent base stations, with one of them be labeled as first base station, another is labeled as second base station.As long as can find two adjacent base stations at least in technical scheme, the behavior of one of them meets the description of the present invention to first base station, and another behavior meets the description of the present invention to second base station, and then this technical scheme just belongs to protection scope of the present invention.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (13)
1. the method for interacting load information between the base station in the wireless evolution network is characterized in that, comprises following steps:
First base station sends load report to the second adjacent base station, wherein comprises the first base station present load information and first base station receive load report recently from second base station reception condition information;
When second base station is received from the load report of first base station, if the predefined condition of described reception condition information conforms then sends load report to first base station.
2. the method for interacting load information between the base station is characterized in that in the wireless evolution network according to claim 1, and described reception condition information is the time of reception of the load report that receives from second base station recently of first base station;
To be described time of reception the most proximad send the transmitting time of load report in first base station early than second base station to described predefined condition.
3. the method for interacting load information between the base station in the wireless evolution network according to claim 1, it is characterized in that, described reception condition information is the most proximad transmitting time of first base station transmission load report of second base station, and this transmitting time is carried at second base station in the load report that first base station sends;
Described predefined condition is that transmitting time in the described reception condition information and second base station the most proximad send the difference of transmitting time of load report greater than predetermined thresholding in first base station.
4. the method for interacting load information between the base station in the wireless evolution network according to claim 1, it is characterized in that, described reception condition information is the most proximad identification number of the load report of first base station transmission of second base station, and this identification number is carried at second base station in the load report that first base station sends;
Described predefined condition is that the most proximad the identification number of the load report that sends of first base station is different for identification number and second base station in the described reception condition information.
5. the method for interacting load information between the base station in the wireless evolution network according to claim 1, it is characterized in that, in the load report that first base station sends, comprise the second base station present load information and second base station receive load report recently from first base station reception condition information in second base station;
When first base station is received from the load report of second base station, if the predefined condition of described reception condition information conforms then sends load report to second base station.
6. according to the method for interacting load information between the base station in each described wireless evolution network in the claim 1 to 5, it is characterized in that described first base station and described second base station periodically send load report mutually.
7. the method for interacting load information between the base station is characterized in that described cycle time is less than the longest effective time of load information in the wireless evolution network according to claim 6.
8. the method for interacting load information between the base station is characterized in that in the wireless evolution network according to claim 6, also comprises following steps:
When first base station received load report from second base station, the time of reception of record load report if the new load report from second base station is not received in first base station in default duration, then sent the message of request load report to second base station;
When second base station receives the message of request load report, send the current load report in second base station to first base station.
9. the method for interacting load information between the base station is characterized in that in the wireless evolution network according to claim 8, and described default duration is second base station sends cycle time from load report to first base station.
10. the method for interacting load information between the base station in the wireless evolution network according to claim 6, it is characterized in that, when switch for subscriber equipment as source base station decision described base station, the difference of selecting the last time of obtaining the load information report and current time is preferentially selected handover-target base station less than the adjacent base station that presets thresholding in these adjacent base stations.
11. the method for interacting load information between the base station in the wireless evolution network according to claim 10, it is characterized in that, if the time that described source base station can't obtain load information report in the last time and the difference of current time find target BS in less than the adjacent base station that presets thresholding, then other adjacent base station to this source base station sends the message of asking load report;
Described other adjacent base station is responded load report to described source base station;
The load report that described source base station is responded according to described other adjacent base station selects corresponding target BS to switch.
12. the base station in the wireless evolution network is characterized in that, comprises:
Sending module is used for sending load report to adjacent base station, wherein comprises this base station present load information and this base station receive load report recently from this adjacent base station reception condition information;
Receiver module is used to receive the load report from adjacent base station;
Judge module, whether the reception condition information of the load report that is used for judging that described receiver module is received meets predefined condition, if then indicate described sending module to send load report to described adjacent base station.
13. the base station in the wireless evolution network according to claim 12 is characterized in that, also comprises:
Timer, be used for when the load report of receiving from adjacent base station, starting,, then restart if before overtime, receive new load report from this adjacent base station, if overtime incident takes place, then indicate described sending module to send load report to this adjacent base station.
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