CN100484303C - Terminal batch switching method and device in radio evolution network - Google Patents
Terminal batch switching method and device in radio evolution network Download PDFInfo
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Abstract
The present invention discloses radio evolution network terminal batch switching method and device. Said method includes radio support server obtaining radio resource management information among cell making radio resource management batch switching decision, when need making batch switching transmitting switching requirement signaling to source base station; source base station receiving switching requirement signaling and selecting to be switched terminal and finally determining whether making batch switching; when need making batch switching, source base station transmitting batch switching requesting signaling to target base station; target base station analyzing said signaling and making processing to terminal, transmitting batch switching confirming requesting signaling to source base station; source base station receiving batch switching confirming requesting signaling and transmitting batch switching command to relevant terminal; relative to each terminal making follow-up normal switching process. The present invention realizes load equalization among cell through leading-in radio support server triggering batch switching process.
Description
Technical field
The present invention relates to the wireless mobile communications field, relate in particular to method and device thereof that a kind of radio evolution network terminal batch is switched.
Background technology
Universal mobile telecommunications system (Universal Mobile Telecommunications System, UMTS) be to adopt Wideband Code Division Multiple Access (WCDMA) to insert (Wideband Code Division Multiple Access, WCDMA) 3-G (Generation Three mobile communication system) of air interface technologies (3G) also calls the WCDMA communication system to UMTS usually.
Figure 1 shows that the system construction drawing of UMTS.UMTS has adopted and the similar structure of second generation mobile communication system (2G), it comprises Radio Access Network (Radio Access Network, RAN) 20 (is UMTS Terrestrial radio access network (UMTS Territorial Radio Access Network, and core net (Core Network, CN) 30 UTRAN)).Wherein Radio Access Network 20 is used to handle all and wireless function associated, and core net 30 handles that all voice calls are connected with data in the UMTS, and the exchange and the routing function of realization and external network 40.Core net 30 is from being divided into 3G circuit switching (Circuit Switched, CS) 32 and 3G packet switching (Packet Switched, PS) 34 in logic.Radio Access Network 20, core net 30, (User Equipment, UE) 10 have constituted whole UMTS together with subscriber equipment.
Figure 2 shows that the network structure of UTRAN.UTRAN comprises one or more RNSs (Radio Network Subsystem, RNS) 22.RNS 22 by a radio network controller (Radio Network Controller, RNC) 24 and one or more NodeB (base station) 26 form.Interface between RNC 24 and the core net 30 is the Iu interface, and NodeB 26 and RNC 24 are connected by Iub interface.In UTRAN inside, interconnected by the Iur interface between the RNC 24, the Iur interface can connect by connection of the direct physical between the RNC 24 or transmission network.RNC 24 is used for distributing and is attached thereto with control or the Radio Resource (Radio Resource) of relevant NodeB 26.26 of NodeB finish the conversion of the data flow between Iub interface and the Uu interface, also participate in a part of RRM simultaneously.NodeB 26 is base stations of WCDMA system, comprises radio receiving-transmitting unit and Base-Band Processing parts.By the Iub interface and RNC 24 interconnection of standard, mainly finish 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.RNC 24 is used to control the Radio Resource of UTRAN, mainly finishes functions such as connection foundation and disconnection, switching, the merging of grand diversity, RRM control.
The above network architecture is based on the 3GPP Re16 framework of version in the past, present 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) studying a kind of brand-new evolution network framework, to satisfy the application demand of mobile network in 10 years futures even longer time.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.Have a variety of evolution schemes to launch discussion at 3GPP at present, the purpose 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.
3GPP provides a kind of wireless evolution network, and (Long Term Evolution is that the special use of the long-term evolution items of network of 3GPP is write a Chinese character in simplified form LTE) to Long Term Evolution.In this evolvement network, the framework of access network part is evolved to the single node framework that has only a node eNodeB (evolved NodeB) by the NodeB of 3G network and two node structures of RNC.In the research of evolvement network, the design of the radio resource management function of Radio Access Network is an important problem, especially (Radio Resource Management, RRM) function is as interference management, load balancing etc. to consider RRM between the eNodeB.At present the RRM function structure of the LTE that reaches at this problem as shown in Figure 3.
Figure 3 shows that the function structure distribution map of the RRM of prior art.In this framework, E1 is the air interface of UE 10 and network side; E2 is a logic interfacing, and reality is made up of E1 and E3; E3 is the interface between eNodeB 50 and the Centroid eCRNC (evolved Controlling RNC, evolution control RNC) 60, and this eCRNC 60 has the RRM function between the eNodeB 50; E4 is the interface in the user plane of eNodeB and core net node; The similar existing Iu interface of E5 is the interface between access network and the core net; E6 is chain of command and the interface in the user plane between MME/ASGW (Mobility Management Entity/AccessGateway, mobile management entity/IAD) 80 and the mobile anchor point (not shown); E7 provides eNodeB and gateway module 70 (O﹠amp; M Node, Operations ﹠amp; Maintenance Node, operation and maintenance node) interface between.
Under this framework, the RRM function is mainly finished at eNodeB 50, and other RRM functions as 50 of eNodeB are then mainly finished by Centroid eCRNC 60.
When carrying out the RRM function of 50 of eNodeB, need obtain the RRM information of adjacent eNodeB 50, obtaining of RRM information in this framework is to finish by the E3 interface, promptly provide local RRM information to Centroid eCRNC by each eNodeB50, eCRNC is responsible for collecting these RRM information, and finishes the RRM function of 50 of corresponding eNodeB based on these information.
Most of wireless communication systems all are based on so-called multiple access techniques, transmit therein such as the information of voice-and-data.This is a kind of many users who activates simultaneously share the same system resource in organized mode a technology.
In using the 3G network of CDMA technology, because the pseudo orthogonal code that adopts, so exist the phase mutual interference between a plurality of users in sub-district.On the traditional sense, this interference is considered to destroy the part of the inevitable noise of transmission.
In the evolvement network that uses the OFDMA technology, between the different user of same sub-district because the mutually orthogonal of subcarrier, do not have inter-user interference in theory, and when minizone employing similar frequency bands, the interference of minizone then becomes the key factor that influences systematic function.Therefore people need realize the interference management and the load balancing of minizone in wireless evolution network, promptly need be in wireless evolution network managing radio resources.
Yet a problem is, only defined the framework of RRM system in correlation technique, do not provide the concrete scheme that how to realize interference management and load balancing under this framework.
Describe the soft multiplexing solution of Radio Resource of the prior art with reference to Fig. 4 below, this scheme has solved the interference problem of cell edge, also can provide the availability of frequency spectrum preferably simultaneously.
The resource of minizone adopts the soft multiplexing method of Radio Resource, be that each sub-district is divided into two parts in center and marginal zone, the marginal zone is the zone that has signal to intersect with other sub-districts, the marginal zone of each sub-district by static or semi-static distribution the part Radio Resource, the Radio Resource that the marginal zone of neighbor cell is assigned to is disjoint.The base station is in the process of carrying out professional transmitting and scheduling, and at first scheduling is in the UE of marginal zone, and the Radio Resource of its scheduling can only be in its Radio Resource of assigning to; After the UE of marginal zone scheduling was finished, scheduling was in the UE of center again, and its schedulable Radio Resource is all Radio Resources that are left.The part resource allocation of cell edge can change with the long cycle, guaranteed the optimization of resource in long-time.Such scheme has solved the interference problem of cell edge, and the availability of frequency spectrum preferably (it is soft multiplexing that the allocation of radio resources scheme that the sub-district is divided into edge and center calls Radio Resource) also can be provided simultaneously.The resource allocation of this scheme as shown in Figure 4.
Yet this scheme only limits to solve the interference problem of cell edge, its at be the solution of physical layer, and, still do not provide concrete solution for the RRM of how realizing under the LTE framework shown in Figure 3 based on load balancing.
Therefore, people need a solution, can solve the problem in the above-mentioned correlation technique, are used at the wireless evolution network managing radio resources.
Summary of the invention
In view of this, technical problem to be solved by this invention is method and the device thereof that is to provide a kind of radio evolution network terminal batch switching, to realize the intra-cell load balancing in the evolvement network.
For solving the problems of the technologies described above, the present invention is by adopting following technical scheme to realize:
The method that a kind of radio evolution network terminal batch of the present invention is switched, described wireless evolution network comprises radio support server, source base station, target BS and terminal, it may further comprise the steps:
The current RRM relevant information in this sub-district is monitored and collected to step a1, source base station and target BS respectively;
Step a2, source base station and the target BS mode by Event triggered or periodic triggers is RRM relevant information between the radio support server reporting subdistrict respectively;
Wherein, described Event triggered is specially: when the load of the fringe region of source base station sub-district surpass or the Radio Resource the dispatched channel condition variation that is lower than the situation of a predetermined threshold or ought distributes to described source base station cell edge originally to the situation that is lower than another predetermined threshold value;
Step a3, radio support server obtain the up-to-date RRM relevant information of source base station sub-district and target BS sub-district;
Step b, radio support server carry out batch change action decision-making of RRM according to the RRM relevant information of current up-to-date minizone of collecting; Judge whether to criticize switching, when needs are criticized handoff procedure, then carry out step c, in the time need not criticizing handoff procedure, then return step a1;
Step c, radio support server, source base station and target BS and terminal cooperate the execution terminal to criticize switching.
In the method, step c specifically may further comprise the steps:
Step c1, radio support server send to switch to source base station and require signaling;
Step c2, source base station receive switch require signaling after, select to be in the part terminal on Target cell border indicated in this signaling, and whether final decision criticizes switching, when needs are criticized switching, then proceed to step c3, in the time need not criticizing switching, then return step a1;
Step c3, source base station send batch handoff request signaling to target BS;
Step c4, target BS are analyzed this demand signalling, and terminal is carried out access control, context and resource reservation, send batch switching to source base station then and confirm demand signalling;
Step c5, source base station receive batch switching and confirm demand signalling, send batch switching command to relevant terminal;
After step c6, corresponding terminal are received described switching command, carry out follow-up normal switching flow at each independent terminal.
In addition, the present invention also provides a kind of radio evolution network terminal batch device for switching, and it comprises radio support server, source base station, target BS and terminal,
Described radio support server is used to obtain the up-to-date RRM relevant information of source base station sub-district and target BS sub-district, and carries out batch change action decision-making of RRM;
Described source base station and target BS are used for the mode RRM relevant information between described radio support server reporting subdistrict respectively by Event triggered or periodic triggers; And cooperate described radio support server execution terminal to criticize switching; Described Event triggered is specially: when the load of the fringe region of source base station sub-district surpasses or be lower than the situation of a predetermined threshold, or the Radio Resource the dispatched channel condition variation that ought distribute to described source base station cell edge originally is to the situation that is lower than another predetermined threshold value.
Compared with prior art, the present invention has following beneficial effect: the present invention triggers batch switching flow by introducing radio support server, has solved the problem of minizone RRM in the wireless evolution network, has realized intra-cell load balancing.
Description of drawings
Fig. 1 is the system construction drawing of UMTS.
Fig. 2 is the network structure of UTRAN.
Fig. 3 is the function structure distribution map of the RRM of prior art.
Fig. 4 is a Radio Resource soft-frequency reuse schematic diagram.
Fig. 5 is a kind of radio gradual network structure with radio support server of two-layer node.
The signaling process figure that Fig. 6 switches for radio evolution network terminal batch of the present invention.
Embodiment
For making technical problem to be solved by this invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Figure 5 shows that a kind of radio gradual network structure of two-layer node with radio support server.
The method that a kind of radio evolution network terminal batch of the present invention is switched, its invention basic ideas are: introduce radio support server in evolvement network, radio support server is collected the wireless resource management information of each base station by the mode of periodicity or Event triggered.Comprise the load information of each sub-district etc. in this information.Radio support server is differentiated according to the information that these report, heavier when the load of a certain sub-district, and the load of neighbor cell can trigger batch switching flow when light, some terminals in the sub-district are switched to neighbor cell, to realize the purpose of load balancing.
The method that radio evolution network terminal batch of the present invention is switched is described in detail below.As shown in Figure 6, this wireless evolution network comprises radio support server, source base station, target BS and terminal, and this method comprises the steps:
Step S1, source base station and target BS are monitored the current loading condition in this sub-district respectively, when the load of base station fringe region surpassed a certain threshold value or is lower than a certain threshold value, source base station and target BS reported the RRM relevant information to radio support server respectively.
Wherein the RRM relevant information comprises the total load of sub-district, the load in cell edge district, the distribution situation of cell edge load or the distribution of wireless channel conditions on frequency domain of cell edge.But therefore the edge distributing radio resource collection of sub-district is not needed to report by the radio support server configuration.
Step S1 belongs to the process that radio support server obtains the RRM relevant information of source base station and target BS minizone.Wherein shown in Figure 6 crowd of switching flow figure and process described above thereof are the passive processes of obtaining the RRM relevant information of source base station sub-district and target BS sub-district of radio support server.Be noted that the above only is one of them specific embodiment of the present invention, only, the present invention is not limited only to this.Step S1 of the present invention can also initiatively obtain the process of the RRM relevant information of source base station sub-district and target BS sub-district for radio support server.
Below initiatively obtain the process of the RRM relevant information of source base station sub-district and target BS sub-district for radio support server, it specifically comprises:
Step S1 ', source base station and target BS are monitored the current loading condition in this sub-district respectively, when the load of fringe region surpasses a certain threshold value or is lower than a certain threshold value, report described information to radio support server; After radio support server was received the described information that reports, radio support server sent minizone RRM request to all adjacent target BS of source base station, requires target BS that necessary minizone RRM relevant information is provided; After target BS is received minizone RRM request,, report the corresponding radio resource management related information to radio support server according to the requirement in the signaling.
The above is that source base station and target BS are monitored the current loading condition in this sub-district respectively, and when the load of cell edge region surpasses a certain threshold value or is lower than a certain threshold value, the synchronizing process of wireless resource management information between triggering cell.The present invention is equally applicable to the situation of Radio Resource channel, be that source base station and target BS are monitored the current Radio Resource channel situation in this sub-district, collect the RRM relevant information, when the Radio Resource the dispatched channel condition variation of distributing to the source base station cell edge originally when being lower than the situation of another predetermined threshold value, but the also synchronizing process of wireless resource management information between triggering cell.Both of these case all belongs to the mode of Event triggered, and the present invention not only is confined to this, and similarly, the present invention also can periodically go the synchronizing process of wireless resource management information between triggering cell.
Step S2, radio support server are according to the current RRM relevant information of collecting, carry out batch change action decision-making of RRM, judge whether to criticize switching, when needs are criticized handoff procedure, then proceed to step S3, in the time handoff procedure need not being criticized, then return step S1.
In this step, concrete deterministic process is carried out according to internal algorithm by radio support server, for example, when the load of source base station sub-district overweight, and the load of target BS sub-district then can trigger batch switching flow when light, and some terminals in the target BS sub-district are switched to the source base station sub-district; Overweight when the load of source base station sub-district, and the load of target BS sub-district is not then criticized handoff procedure when heavier yet.
Step S3, radio support server send to switch to source base station and require signaling, comprise the information of switching target small area in this signaling, also comprise the traffic carrying capacity size that switches to Target cell that radio support server is advised simultaneously.
Step S4, source base station receive switch require signaling after, selection is in the part terminal on the border of target BS sub-district indicated in this signaling, this selection course need be considered the traffic carrying capacity size that switches to the target BS sub-district that radio support server is advised, but final decision is made by source base station, i.e. the concrete parameter of this switching can not be subjected to the control of radio support server.
In this step, when selecting to be switched terminal, need to consider the traffic information of terminal on the one hand, the signal that also needs on the other hand to select its target BS according to its measurement report is terminal preferably, it is relevant with the activation threshold value of normal switching flow that this selection also needs, and switchback is next again after cutting over to avoid terminal by certain mechanism.
Step S5, source base station send batch handoff request signaling to the target cell base station sub-district, comprise the tabulation of the terminal in to be switched past in this signaling.
This demand signalling is analyzed in step S6, target BS sub-district, and terminal is carried out access control, context and resource reservation, sends batch Handover Request Acknowledge signaling to source base station then.
After step S7, source base station receive batch Handover Request Acknowledge signaling, to relevant terminal multicast switching command.
After step S8, corresponding terminal are received described switching command, carry out carrying out follow-up normal switching flow at each independent terminal.
Step S3 belongs to radio support server, source base station and target BS thereof to step S8 and cooperates the follow-up terminal of execution to criticize the concrete implementation of switching.
In addition, the present invention also provides a kind of radio evolution network terminal batch device for switching, it comprises radio support server, source base station, target BS and terminal, trigger batch switching flow by radio support server, do final batch change action decision-making by source base station, and finish whole batch of handoff procedure jointly by source base station, target BS and terminal.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1, a kind of method of radio evolution network terminal batch switching, wireless evolution network comprises radio support server, source base station, target BS and terminal, it is characterized in that, this method may further comprise the steps:
The current RRM relevant information in this sub-district is monitored and collected to step a1, source base station and target BS respectively;
Step a2, source base station and the target BS mode by Event triggered or periodic triggers is RRM relevant information between the radio support server reporting subdistrict respectively;
Wherein, described Event triggered is specially: when the load of the fringe region of source base station sub-district surpass or the Radio Resource the dispatched channel condition variation that is lower than the situation of a predetermined threshold or ought distributes to described source base station cell edge originally to the situation that is lower than another predetermined threshold value;
Step a3, radio support server obtain the up-to-date RRM relevant information of source base station sub-district and target BS sub-district;
Step b, radio support server carry out batch change action decision-making of RRM according to the up-to-date RRM relevant information of current minizone of collecting; Judge whether to criticize switching, when needs are criticized handoff procedure, then carry out step c, in the time need not criticizing handoff procedure, then return step a1;
Step c, radio support server, source base station and target BS and terminal cooperate the execution terminal to criticize switching.
2, the method for claim 1, it is characterized in that described RRM relevant information comprises the total load of sub-district, the load in cell edge district, the distribution situation of cell edge load or the distribution of wireless channel conditions on frequency domain of cell edge.
3, the method for claim 1 is characterized in that, step c specifically may further comprise the steps:
Step c1, radio support server send to switch to source base station and require signaling;
Step c2, source base station receive switch require signaling after, select to be in the part terminal on Target cell border indicated in this signaling, and whether final decision criticizes switching, when needs are criticized switching, then proceed to step c3, in the time need not criticizing switching, then return step a1;
Step c3, source base station send batch handoff request signaling to target BS;
Step c4, target BS are analyzed this demand signalling, and terminal is carried out access control, context and resource reservation, send batch switching to source base station then and confirm demand signalling;
Step c5, source base station receive batch switching and confirm demand signalling, send batch switching command to relevant terminal;
After step c6, corresponding terminal are received described switching command, carry out follow-up normal switching flow at each independent terminal.
4, method as claimed in claim 3 is characterized in that, requires to comprise in the signaling information of switching target small area and the traffic carrying capacity size that switches to Target cell that radio support server is advised in switching described in the step c1.
5, method as claimed in claim 3 is characterized in that, when selecting the part terminal in step c2, needs to consider the traffic information of terminal, the activation threshold value of the signal of target BS and normal switching flow.
6, method as claimed in claim 3 is characterized in that, comprises the tabulation of the terminal in to be switched past in described in the step c3 batch of handoff request signaling.
7, a kind of radio evolution network terminal batch device for switching, it comprises radio support server, source base station, target BS and terminal, it is characterized in that:
Described radio support server is used to obtain the up-to-date RRM relevant information of source base station sub-district and target BS sub-district, and carries out batch change action decision-making of RRM;
Described source base station and target BS are used for the mode RRM relevant information between described radio support server reporting subdistrict respectively by Event triggered or periodic triggers; And cooperate described radio support server execution terminal to criticize switching;
Described Event triggered is specially: when the load of the fringe region of source base station sub-district surpasses or be lower than the situation of a predetermined threshold, or the Radio Resource the dispatched channel condition variation that ought distribute to described source base station cell edge originally is to the situation that is lower than another predetermined threshold value.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2008098508A1 (en) * | 2007-02-06 | 2008-08-21 | Huawei Technologies Co., Ltd. | Method and system for activating multimedia broadcast and multicast service |
| CN101188861B (en) * | 2007-07-06 | 2010-06-02 | 中兴通讯股份有限公司 | Switching method inside the system |
| WO2009089658A1 (en) * | 2008-01-17 | 2009-07-23 | Lucent Technologies Inc. | Method for handover of terminal, network element, base station, and communication system |
| CN101553017B (en) * | 2008-04-03 | 2011-12-21 | 华为技术有限公司 | Method for controlling resource release, network element device and network system |
| CN101594652B (en) * | 2008-05-28 | 2012-09-05 | 电信科学技术研究院 | Method for starting update load bearing configuration in switching process and system and device thereof |
| JP5599396B2 (en) * | 2008-07-25 | 2014-10-01 | アルカテル−ルーセント | Method and apparatus for restructuring a network topology in a wireless relay communication network |
| CN101801029B (en) * | 2009-02-06 | 2013-09-11 | 华为技术有限公司 | Method, device and system for managing cell |
| CN103458463B (en) * | 2009-02-06 | 2017-06-20 | 华为技术有限公司 | cell management method, device and system |
| CN101711044B (en) * | 2009-11-17 | 2012-10-03 | 中兴通讯股份有限公司 | Method and device for realizing load balance among neighboring cells |
| CN103457967B (en) * | 2012-05-30 | 2015-05-20 | 腾讯科技（深圳）有限公司 | Service node switching method and system |
| WO2015085562A1 (en) * | 2013-12-13 | 2015-06-18 | 华为技术有限公司 | System, device and method for coordinating load balance |
| CN105847384B (en) * | 2016-04-20 | 2018-11-23 | 广东工业大学 | A kind of switching method of the network-control based on big data |
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