CN1984434A - Wireless telecommunication system and method for managing wireless resource and switching in residence - Google Patents
Wireless telecommunication system and method for managing wireless resource and switching in residence Download PDFInfo
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Abstract
The system comprises: evolved core network; at least one control plane server (CPS), and multi E-NodeBs under each CPS. E-NodeB directly builds connection with evolved core network in order to implement the processing of radio interface physical layer, the management of its own radio resources, the multimedia broadcast/multicast, network sharing function and system broadcast, and the switch control between UE and different E-NodeBs. CPS is used for providing resources information of each cell and the cell radio resource management strategy for E-NodeB under its own control.
Description
Technical field
The present invention relates to the mobile communication technology field, be specifically related to a kind of wireless communication system and radio resource management method thereof and cell switching method.
Background technology
Along with the development of 3G (Third Generation) Moblie technology, the network planning and optimization work are more and more important.Because the quick growth of number of mobile users and the continuous appearance of new business, the requirement system is supporting multiple business and is satisfying under certain QoS (service quality) condition, obtain the good network capacity, satisfy certain wireless coverage requirement, provide best service by the balanced relation between adjustment capacity, covering, the quality simultaneously.
The purpose of the network optimization is to improve quality of services for users, improves utilization rate of network resource.Therefore, need to seek the available resources that the efficient radio resource management scheme is come management system, to satisfy the continuous increase of user capacity.RRM generally comprises switching controls, power control, admits control, load control etc.The factor that design exerts a decisive influence to wireless resource management algorithm comprises business model, channel model and system model.Because the service parameter model is identical with channel model to all 3G (Third Generation) Moblie technology, determines that the different factor of each RRM of system mainly is a physical-layer techniques.
With WCDMA (Wideband Code Division Multiple Access (WCDMA)) system is example, the network architecture of 3-G (Generation Three mobile communication system) as shown in Figure 1: this system is made up of CN (core net), UTRAN (wireless access network) and UE (user terminal) three parts.The interface of CN and UTRAN is the Iu interface, and the interface of UTRAN and UE is the Uu interface.
As shown in Figure 2, UTRAN comprises many RNS (Radio Network System) that are connected to CN by the Iu interface.A RNS comprises a RNC (radio network controller) and one or more Node B (base station).Node B is connected on the RNC by Iub interface, and it supports FDD (Frequency Division Duplexing (FDD)) pattern, TDD (time division duplex) pattern or bimodulus.Node B comprises one or more sub-districts.
In UTRAN inside, the RNC among each RNS is by Iur interactive interfacing information, and Iu interface and Iur interface are logic interfacing.The Iur interface can be the directly continuous of physics between the RNC or pass through suitable transmission network and realize.
Wherein, RNC concentrates and is responsible for whole RRMs in the wireless access network, promptly when allocation of radio resources, the scheduling of each terminal in access procedure, and quality-monitoring in the communication process and maintenance, the resource operating position of each Node B in the wireless access network, the switching of terminal between the sub-district etc.And a common RNC need control more or less a hundred Node B and a large amount of UE that are operated under the Node B.Mainly there is following shortcoming in this way to manage:
1.RNC middle RRM (RRM) processor load is too heavy: a large amount of Node B are arranged in a RAN (wireless access network), and in each Node B, have a plurality of UE to work simultaneously.A RNC need handle the RRM problem of tens thousand of terminals simultaneously.Along with the theory of RRM and further developing of algorithm, the shared RNC of RRM that handles a terminal handles resource and will get more and more, the disposal ability that has exceeded RNC has been sacrificed the performance of RRM so all adopt simple algorithm in the present product.
2. be difficult to realize quick control: because of present RRM all carries out in RNC, all information, comprise terminal and Node B measurement and come all information of self terminal, network management system and core net, all must focus in the RMM processor of RNC by high-level signaling and handle, result sends to terminal by high-level signaling again and Node B carries out.This process has long time delay, and making needs the method for fast processing, waits and can not realize as high efficiency automatic repeat requests (ARQ), thereby cause the systematic function reduction.
3. user's face time delay is bigger: because user's face has this intermediate node of RNC, the required processing time of time that caching mechanism and processing procedure are required and agreement layer transition finally causes professional in the bigger time delay of user's face existence, has limited the further lifting of user experience.
Summary of the invention
The purpose of this invention is to provide a kind of wireless communication system, to overcome the existing wireless communications system because user's face has this intermediate node of RNC, make user's face have the shortcoming of bigger delay, the optimization system framework satisfies user plane time delay demand in the 3G wireless communication system evolution process.
Another object of the present invention provides a kind of radio resource management method, wireless communication system based on two-tier system user face, to overcome in the prior art RRM (RRM) overload among the RNC, be difficult to realize the shortcoming of quick control, improve the processing speed and the efficient of RRM, and then improve systematic function.
Another object of the present invention provides a kind of cell switching method, based on the wireless communication system of two-tier system user face, shortening HO-break duration effectively, and guarantees higher handover success rate.
For this reason, the invention provides following technical scheme:
A kind of wireless communication system comprises: a plurality of evolution base station E-Node B that evolution core net Evolved CN, at least one chain of command server CPS and each CPS have under its command;
Described Evolved CN is responsible for and being connected of other networks and communicating by letter and management to user equipment (UE); Described E-Node B directly connects by IP network and Evolved CN, is used to finish the processing of wave point physical layer protocol, the management and the switching controls of user equipment (UE) between different E-Node B of self Radio Resource; Described CPS connects by the E-Node B that the Icn interface has under its command with it, is used to its E-Node B that has under its command that many cell managements strategy is provided, and the target E-Node B that selects suitable Target cell and follow for it when E-Node B need switch.
Described CPS comprises:
Many cell managements policy library is used to store many cell managements strategy;
The cell radio resource information bank is used to store the wireless resource information of each sub-district of E-Node B that CPS has under its command.
Described E-Node B comprises:
The base station wireless resource information bank, the wireless resource information that is used to store E-Node B;
The base station wireless resource administration module is used for independently finishing according to the information of base station wireless resource information bank the management of himself Radio Resource; The management that described base station wireless resource administration module carries out self Radio Resource comprises: to the control of switching between different districts under the distribution and the integration of resource, the control of admitting data re-transmission between management, congestion management, communication link monitoring, data packet dispatching, power control and the user equipment (UE), the E-Node B;
Many cell managements strategy, Target cell that provides according to CPS and the target E-Node B that follows are provided the switching controls module, carry out switch decision and the control of UE.
Base station wireless resource administration module among each E-Node B that described CPS has under its command with it is by Signalling exchange, the wireless resource information of each E-Node B of real-time update synchronized cells wireless resource information library storage.
Alternatively, described CPS is positioned at independently on the functional node, perhaps is positioned on its any one E-Node B that has under its command.
Alternatively, finish the control of system broadcasts function by Evolved CN or E-Node B.
A kind of radio resource management method based on above-mentioned wireless communication system, described system comprises: a plurality of evolution base station E-Node B that evolution core net Evolved CN, at least one chain of command server CPS and each CPS have under its command said method comprising the steps of:
A, E-Node B manage and report to CPS in real time the result of Radio Resource to its Radio Resource;
B, CPS by and its E-Node B that has under its command between interface receive the result of each E-Node B Radio Resource in real time;
C, be that unit sets up the Radio Resource upstate that has each sub-district under its command and handles load with the sub-district according to the result that receives;
D, when needs carry out switching between E-Node B, the many cell managements policy control that is provided according to CPS by source E-Node B is finished the handoff procedure between E-Node B.
E-Node B comprises the process that its Radio Resource manages in the described steps A:
E-Node B distributes with reprovision, resource its Radio Resource and keeps and resource release.
Between described step C and step D, also comprise step:
User equipment (UE) sends measurement report to source E-Node B, and described measurement report comprises candidate cell pilot quality information at least.
Described step D comprises:
D1, source E-Node B provide the Radio Resource upstate of candidate cell in the described measurement report and handle laod measurement to the CPS request;
D2, CPS are according to the Radio Resource upstate of the candidate cell of source E-Node B request and handle laod measurement, the target E-Node B that selects suitable Target cell to reach and follow, and provide many cell managements strategy for source E-Node B;
D3, source E-Node B control described UE and switch to described Target cell according to many cell managements strategy that CPS provides, and UE is set up and being connected of target E-Node B.
Described step D3 comprises:
D31, before UE carries out handoff procedure, source E-Node B notification target E-Node B is that UE to be accepted distributes and keep corresponding resource;
D32, target E-Node B are that notification source E-Node B can make UE enter handoff procedure after UE to be accepted distributed and keeps corresponding resource and finish,
D33, source E-Node B indication UE carries out handoff procedure;
After D34, UE switching was finished, target E-Node B indication source E-Node removed original user's face link.
Described step D32 further comprises:
When target E-Node B notification source E-Node B can make UE enter handoff procedure, request Evolved CN user carried out the data link conversion in the face of UE;
Evolved CN user carries out after data link converts in the face of UE, and the data that Evolved CN user face issues are carried out buffer memory by target E-Node B.
Described step D33 further comprises:
After source E-Node B indication UE carries out handoff procedure, before target E-Node B, change and support the harmless required user grouping of switching.
Described support is harmless switches required user grouping and comprise: source E-Node B sends to UE but does not receive the user grouping that does not send to UE as yet in user grouping that UE confirms, the source E-Node B buffer memory.
A kind of changing method based on above-mentioned wireless communication system, described system comprises: a plurality of evolution base station E-Node B that evolution core net Evolved CN, at least one chain of command server CPS and each CPS have under its command said method comprising the steps of:
(1) CPS is according to the Radio Resource upstate of the candidate cell of source E-Node B request and handle laod measurement, the target E-Node B that selects suitable Target cell to reach and follow, and provide many cell managements strategy for source E-Node B;
(2) E-Node B in source sends the handover preparation request message to target E-Node B;
(3) after target E-Node B receives described handover preparation request message, for UE to be accepted distributes and keep corresponding resource;
(4) target E-Node B after UE to be accepted becomes the distribution of work and keeps corresponding resource, sends the handover preparation acknowledge message to source E-Node B, sends data link transfer-request message to Evolved CN user face simultaneously;
(5) after E-Node B in source receives the handover preparation acknowledge message of target E-Node B response, send switching command to UE, indication UE carries out handoff procedure;
(6) after Evolved CN receives the data link transfer-request message that target E-Node B sends, carry out the data path conversion;
(7) after UE receives described switching command, reach handoff procedure synchronously to described Target cell;
(8) UE and Target cell synchronously after, send switching authentic information to target E-Node B, finish handoff procedure.
Described method further comprises step:
(9) after target E-Node B receives the switching authentic information of UE transmission, send handoff completion message to source E-Node, indication source E-Node removes original user's face link;
(10) after source E-Node receives described handoff completion message, remove original user's face link.
Described step (5) further comprises:
Source E-Node B is after UE sends switching command, change to support the harmless required user grouping of switching before target E-Node B, described user grouping comprises: source E-Node B sends to UE but does not receive the user grouping that does not send to UE as yet in user grouping that UE confirms, the source E-Node B buffer memory.
Between described step (6) and step (7), also comprise step:
Evolved CN user carries out after data link converts in the face of UE, and the data that Evolved CN user face issues are carried out buffer memory by target E-Node B.
Described handover preparation request message comprises: the UE contextual information.
Described step (3) is specially:
Target E-Node B is that UE to be accepted distributes and keep corresponding resource according to the resource distribution relevant parameter in the described UE contextual information.
When UE does not possess autonomous presynchronization function, source E-Node B carries Target cell in the switching command that UE sends wireless parameter information.
By above technical scheme provided by the invention as can be seen, wireless communication system of the present invention adopts evolution core net Evolved CN and the direct-connected two-tier system mode of evolution base station E-Node B at user's face, functional node and relevant interface number have been reduced effectively, and then reduced since multistage transfer introduce than long time delay, satisfied the strict demand of user plane time delay in the 3G wireless communication system evolution process better.Adopt the two-tier system pattern of Evolved CN-E-Node B at chain of command, and assist with CPS.Independently bear the correlation function of himself RRM by E-NodeB, and the auxiliary switching control function of comprehensively finishing UE by CPS, simultaneously the information relevant with RRM rationally is distributed among E-Node B and the CPS, thereby has greatly improved the processing speed and the efficient of RRM.Because the load of CPS is lighter with respect to the RNC in the existing wireless communications system, therefore help implementing more complicated, more effective wireless resource management algorithm, improve the overall performance of system equipment.
The present invention is by source E-Node B master control, and CPS assists the handoff procedure of finishing between E-Node B, has shortened HO-break duration effectively, and has guaranteed higher handover success rate, helps supporting harmless enforcement of switching, and promotes user's experience.
Description of drawings
Fig. 1 is the network architecture schematic diagram of 3-G (Generation Three mobile communication system);
Fig. 2 is the UTRAN structural representation;
Fig. 3 is the network architecture schematic diagram of wireless communication system of the present invention;
Fig. 4 is the theory diagram of CPS and E-Node B in the system of the present invention;
Fig. 5 is the realization flow figure of radio resource management method of the present invention;
Fig. 6 is the realization flow figure of cell switching method of the present invention.
Embodiment
Core of the present invention is to adopt evolution core net Evolved CN and the direct-connected two-tier system mode of evolution base station E-Node B at user's face, and E-Node B directly connects by IP network and Evolved CN.Simultaneously, introduce chain of command server CPS, a CPS has a plurality of E-Node B under its command, that is to say that chain of command also adopts the two-tier system mode.Take into account the characteristic of delay requirement and many cell managements at chain of command, realize under single sub-district and E-Node B resource and the closely-related radio resource management function of characteristic, finish professional functions such as foundation, maintenance and release by E-Node B; Finish and many sub-districts and the closely-related radio resource management function of whole network by the auxiliary E-Node B of CPS, such as, the management of the handoff procedure between E-Node B.
Connect by the Icn interface between CPS and the E-Node B, by this interface, CPS dynamically receives the relevant process of the idle wireless resource result of (comprising processes such as resource allocation/reprovision, resource reservation and resource release).CPS is that unit sets up the Radio Resource upstate that has each sub-district under its command and handles load with the sub-district; On measurement report and CPS the local resource situation of safeguarding and the basis of handling information on load of E-Node according to UE, select the appropriate wireless resources management strategy to carry out switch decision and the control of UE.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
With reference to Fig. 3, Fig. 3 is the network architecture schematic diagram of wireless communication system of the present invention:
Three kinds of functional entitys are arranged: (1) evolution core net Evolved CN in the wireless communication system architecture of the present invention; (2) chain of command server CPS; (3) evolution base station E-Node B.Wherein, an Evolved CN can have one or more CPS and a plurality of E-Node B under its command, and a CPS can have a plurality of E-Node B under its command.
The present technique field personnel know, the evolution of 3G wireless communication system needs the systems attempt flattening, so that reduce functional node and relevant interface number, and then reduces the time delay that multistage transfer is introduced.So the present invention is in selected Evolved CN of user's face and the direct-connected two-tier system mode of E-Node B, in order to satisfy the strict demand of user plane time delay; Take into account the characteristic of delay requirement and many cell managements simultaneously at chain of command, realize under single sub-district and E-Node B resource and the closely-related radio resource management function of characteristic by E-Node B, and finish the radio resource management function relevant with whole network (for example: the management of the handoff procedure between E-Node B) with many sub-districts by the auxiliary E-Node B of CPS.This distribution process with focus on the RRM mode that combines and can promote the overall performance of RAN (wireless access network) system effectively.
Three entities function separately is as follows:
Evolved CN: it is finished and has the similar function of 3G core net CN now, promptly is responsible for and being connected of other networks and communicating by letter and management to UE (subscriber equipment).
CPS:, when E-Node B need switch, select suitable Target cell and the target E-NodeB that follows for it for its E-Node B that has under its command provides each cell radio resource management information and many cell managements strategy.
E-Node B: Node B basic function (for example in finishing the 3G system, the processing of wave point physical layer protocol) outside, also independently bear the correlation function of E-Node B self RRM, for example: the functions of switching between different districts under resource allocation and integration, admittance management, congestion management, communication link monitoring, data packet dispatching power, control and switching controls, the E-Node B such as control.That is to say that E-Node B not only will independently finish and own resource and the closely-related radio resource management function of characteristic, also will finish and many cell managements and the closely-related radio resource management function of network by the auxiliary of CPS.Secondly, in order to promote the adaptive capacity of RAN (Radio Access Network) system, select by the adaptivity of HARQ (mix automatically and retransmit) technology for encoding and modulation technique between E-Node B and the UE for the wireless channel time-varying characteristics.In order to eliminate the transmission error in data that HARQ leaves over, contain outer retransmission mechanism in the upper-layer protocol of E-Node B.In order to carry out high efficiency RRM, E-Node B also finishes the control that UE is measured.In addition, E-Node B can participate in also that MBMS, network share, functions such as system broadcasts control and KPI parameter extraction.The system broadcasts controlled function also can be finished by Evolved CN.
E-Node B directly connects by IP network and Evolved CN, that is to say, the user's face in the system has only Evolved CN and two nodes of E-Node B.In chain of command, the signaling moiety of self radio resource management function that E-Node B independently bears directly is connected with Evolved CN, finishes professional foundation, maintenance and release function and handover decisions and execution.Simultaneously, the relevant MBMS of E-Node B, network are shared, function relevant informations such as system broadcasts control and KPI parameter extraction are also through interface and EvolvedCN carry out alternately thus.
Connect by the Icn interface between CPS and the E-Node B, E-Node B reports its other resources situation and handles load condition to CPS in real time.E-Node B carries out switch decision and the control of UE according to RRM (RRM) strategy on UE measurement report and CPS local resource situation of safeguarding and the basis of handling information on load.
Icc interface between the CPS is used for auxiliary CPS and finishes the UE switching controls of striding CPS.
Inn interface between the E-Node B is used to and supports the required forward data of harmless switching that data channel is provided, and also setting up for the business in switching simultaneously provides UE Context the transmission channel of (UE context).
In order to realize above-mentioned functions, CPS comprises different functional modules respectively with each E-Node B.Theory diagram with reference to CPS shown in Figure 4 and E-Node B:
In this embodiment, CPS has two E-Node B under its command, and CPS is connected by the Icn interface with E-Node B, connects by the Inn interface between each E-Node B.
CPS comprises many cell managements policy library 401 and cell radio resource information bank 402.
Wherein, many cell managements policy library 401 is used for storage and provides many cell managements strategy to E-Node B; Cell radio resource information bank 402 is used to store the wireless resource information of each sub-district of E-Node B that CPS has under its command.
When needs carry out switching between E-Node B, the measurement message that CPS reports by E-Node B according to UE, it is to be switched UE selected objective target sub-district that the handoff candidate that provides from UE under handoff scenario is concentrated according to the local resource topological data of self grasping.Then by and E-Node B between the Icn interface indicate to source E-Node B by message, use when initiating data link transfer-request for it.
The principle of each E-Node B is identical, comprising: base station wireless resource administration module 411, base station wireless resource information bank 412 and switching controls module 413.Wherein, base station wireless resource administration module 411 is independently finished the management of himself Radio Resource according to the information in the base station wireless resource information bank 412, comprising: to the control of switching between different districts under the distribution and the integration of resource, the control of admitting data re-transmission between management, congestion management, communication link monitoring, data packet dispatching, power control and the user equipment (UE), the E-Node B etc.Information in the base station wireless resource information bank can be configured when system initialization, and the information of different E-Node B configurations can be identical, also can be different.Switching controls module 413 is carried out switch decision and the control of UE according to the wireless resource information of E-Node B of storage, and control UE switches in the Target cell that CPS selects, and UE is set up and being connected of target E-Node B.
Canned data is consistent in the base station wireless resource information bank of each the E-Node B that has under its command with it for canned data in the system wireless resource information bank that makes CPS, base station wireless resource administration module among each E-Node B that CPS has under its command with it need pass through Signalling exchange, the resource information of each the E-Node B that stores in the real-time update synchronized cells wireless resource information storehouse.
When calling out initiation, E-Node B at first carries out UE and admits management process.After admitting successfully,,, and the result of resource allocation/change is reported to CPS for this UE distributes corresponding resource according to the business of its request.In the professional service process, based on QoS (service quality) parameter or the communication link testing result dynamic implementation data packet dispatching and the power control process of business, to guarantee professional service quality.In order to improve reliability of data transmission between E-Node B and the UE, adopt two-layer re-transmission (mixing the automatic repeat requests Outer-ARQ of automatic repeat requests HARQ and outer shroud) mechanism between the two.The resource that has under its command as E-Node B takes place when congested, and E-Node B is responsible for the enforcement that congested measure is conciliate in congested detection.The change result that E-Node B has resource under its command answers real-time report CPS, is convenient to the coordinated scheduling of resource between the adjacent E-Node B administration sub-district.
In this system architecture, CPS by with each E-Node B between interface dynamically receive the relevant process of the Radio Resource result of (comprising processes such as resource allocation/reprovision, resource reservation, resource release), upgrade the resource information of each the E-Node B that stores in the cell radio resource information bank according to this result, and be that unit sets up the Radio Resource upstate that has each sub-district under its command and handles load with the sub-district according to these information.
Under the E-Node B handoff scenario that CPS has under its command, CPS utilizes the related cell Radio Resource availability of being grasped and handles degree of loading, provide effective RRM strategy by many cell managements policy library, utilize the related cell Radio Resource availability of being grasped and handle degree of loading, a preferred Target cell and the E-Node B that follows from the handover candidate cells that UE provides use as target E-Node B and Target cell for switching UE.
At hot zones, this structure is very beneficial for obtaining internal system load balancing and switches high success rate.
When switched the sub-district that UE need stride CPS, auxiliary each CPS provided necessary cell information to E-Node B by the Icc interface between the CPS, finishes switching controls by E-Node B then.
When system realizes, can be according to actual needs, CPS is placed independently on the functional node, also can be placed on any one the E-Node B that has under its command, realize with the basic radio resource management function layering of E-Node B.
As seen, system of the present invention adopts E-Node B and the direct-connected two layers model of Evolved CN at user's face, chain of command adopts the two-tier system pattern of Evolved CN and E-Node B (being aided with CPS), the specific implementation of CPS has certain flexibility simultaneously, and promptly CPS can form independently functional node by framework on E-Node B; The basic radio resource management function layering that also can be combined within the E-Node B with E-Node B realizes.Whole RAN system is based on IP's.Under this framework, realize the radio resource management function relevant with characteristic under single sub-district by E-Node B with E-Node B resource, finish the radio resource management function relevant with whole network and be aided with CPS with many sub-districts by E-Node B, this distribution process with focus on the RRM mode that combines and can effectively promote the overall performance of RAN system.
Describe RRM process below in detail based on system architecture of the present invention.
With reference to Fig. 5, Fig. 5 shows the flow process of radio resource management method of the present invention, may further comprise the steps:
Step 501:E-Node B manages and reports to CPS in real time the result of Radio Resource to its Radio Resource, E-Node B comprises the process that its Radio Resource manages: distribute and processes such as reprovision, resource reservation and resource release.
When UE inserted, E-Node B need distribute required Radio Resource to it, and changed or link-quality should its related resource of reprovision when worsening when business.After UE leaves, be released to its assigned radio resource.In these processes, the self radio resource situation information that E-Node B need upgrade in time and oneself preserve, and the result after will upgrading reports CPS by signaling, so that CPS in time understands the resource situation of each E-NodeB, and is consistent with E-Node B canned data.
Step 502:CPS by and its E-Node B that has under its command between interface receive the result of each E-Node B Radio Resource in real time.
Step 503:CPS is that unit sets up the Radio Resource upstate that has each sub-district under its command and handles load with the sub-district according to the result that receives.
Step 504:UE sends measurement report to source E-Node B, and this measurement report comprises candidate cell pilot quality information at least;
Many cell managements strategy that measurement report that step 505:E-Node B basis is received and CPS provide, the handoff procedure between E-Node B is finished in control.
After source E-Node B receives the measurement report of UE, information to CPS request correlation candidate sub-district, CPS is according to the Radio Resource upstate and the processing information on load of each sub-district of many cell managements strategy and foundation, selected target sub-district and the purpose E-Node B that follows, and respond and give source E-Node B, provide simultaneously and switch required many cell managements strategy, switch to Target cell by source E-Node B control UE then, and it is set up and being connected of target E-Node B to source E-Node B.
For this reason, before UE carried out handoff procedure, source E-Node B notification target E-Node B was that UE to be accepted distributes and keep corresponding resource; Target E-Node B is that source E-Node B indicated UE to carry out handoff procedure again after UE to be accepted distributed and keeps corresponding resource and finish; After the UE switching was finished, target E-NodeB indication source E-Node removed original user's face link.
In order to reduce the break period of switching, target E-Node B successfully for after UE distribution to be accepted and keeping corresponding resource, can ask Evolved CN user to carry out the data link conversion in the face of UE.Evolved CN user carries out after data link converts in the face of UE, and the data that Evolved CN user face issues are carried out buffer memory by target E-Node B.
Simultaneously, in order to support harmless the switching, and avoid packet loss to cause the decline of IP application layer throughput, and know target E-Node B successfully for after UE distribution to be accepted and keeping corresponding resource as source E-Node B, the harmless required user grouping of switching is supported in commentaries on classics before target E-Node B.These user grouping comprise: source E-Node B sends to UE but does not receive the user grouping that does not send to UE as yet in user grouping that UE confirms, the source E-Node B buffer memory.
As seen, utilize the ability of the relevant Radio Resource of management self that E-Node B has in the wireless communication system of the present invention, can realize most radio resource management function in the 3-G (Generation Three mobile communication system), improved the response speed of RAN (wireless access network) system effectively, helped the overall performance of elevator system for the radio link quality fluctuation.
In order to make those skilled in the art person understand the present invention program better, Fig. 6 shows the flow process of the sub-district switching of wireless communication system of the present invention:
1.UE behind the connecting system, regularly carry out cell measurement process and autonomous presynchronization process, and give source E-Node B with measurement report, so-called autonomous presynchronization process is meant that UE does not implement synchronously by the synchronous activationary time of network appointment, but initiatively measure and the synchronization parameter of each adjacent sub-district of demodulation and being stored, use for switching synchronizing process, can accelerate to obtain synchronously.
2. after E-Node B in source receives the measurement result that UE reports, send many cell informations request message, the load of the adjacent sub-district that request is relevant and handle load message to CPS; CPS responds many cell informations response message according to the request of E-Node B, in this message, comprise Radio Resource upstate and the processing laod measurement of CPS according to the candidate cell of source E-Node B request, the suitable Target cell of selecting and and the target E-Node B that follows, and the many cell managements policy information that provides for source E-Node B.
3. E-Node B in source switches according to many cell managements policy information of receiving.
4. E-Node B in source sends handover preparation request (Handover preparation request) message by the Inn interface between the E-Node B to target E-Node B, carry the UE contextual information, in the UE contextual information, comprise and be used for the pre-configured required relevant parameter of computational resource, such as QoS (service quality) parameter.
5. after target E-Node B receives handover preparation request (Handoverpreparation request) message of source E-Node B transmission, distribute and keep corresponding resource for the UE that will admit based on the requests for capacity information in this message.Its objective is UE in case and Target cell obtain synchronously, target E-NodeB can send downlink data to UE immediately, can effectively shorten the break period of data transmissions like this.
6. target E-Node B after UE to be accepted becomes the distribution of work and keeps corresponding resource, sends handover preparation to source E-NodeB and confirms (Handover preparation Confirm) message, and it has finished the assigning process of resource report source E-Node B; Simultaneously,, like this, can make L1 (physical layer) synchronizing process and data path switching process executed in parallel, thereby effectively reduce the break period of switching to Evolved CN transmit path transfer-request (PathSwitch Request) message.
After Evolved CN receives path transfer-request message, implementation path transfer process immediately.After converting, the data that Evolved CN issues are by target E-Node B buffer memory.
7. after E-Node B in source receives that the handover preparation of target E-Node B response is confirmed (Handoverpreparation Confirm) message, send switching command (Handover commit) to UE, indication UE carries out handoff procedure;
Be directed to the scene of not using the autonomous presynchronization technology of UE, need carry the relevant wireless parameter of Target cell in this order, these parameters are known from the receiveing the response of target BS by the pre-configured process of resource, for using in the UE synchronizing process.
8. simultaneously, in order to guarantee to switch the consistency of front and back quality of service, UE Context (UE context) need be sent to target E-Node B by source E-Node B.In order to support harmless the switching, and avoid packet loss to cause the decline (for example TCP (transmission control protocol) is for Slow start (the starting slowly) strategy of alleviating network congestion process startup) of IP application layer throughput, in handoff procedure, source E-Node B need change necessary user grouping before target E-Node B, comprising:
(a) E-Node B in source sends to UE but does not receive the user grouping of the ACK affirmation of UE;
(b) user grouping that does not send as yet in the source E-Node B buffer memory to UE.
9.UE after receiving switching command (Handover commit), implement synchronously and switching: carry out physical layer and switch the shared channel of receiving target sub-district to Target cell.
10.UE after obtaining synchronously with Target cell, respond switching authentic (Handover confirm) message, report that its switching to Target cell finishes to target E-Node B.
11. after target E-Node B receives switching authentic (Handover confirm) message of UE response, send switching to source E-Node B and finish (Handover complete) message, indication source E-Node B removes original user's face link.
So far, the cell switch process under the whole source E-Node B control is finished.
Switch for the sub-district of striding CPS, be CPS according to the boundary information of the topological structure that has the sub-district under its command and in abutting connection with CPS information, the candidate cell that reports with UE by institute in the resource information request message of analyzing source E-Node B identifies just knows candidate cell and E-Node B under the candidate cell and the CPS (target E-Node B and target CPS) that whether has other CPS territories to have under its command.If the candidate cell under other CPS territories is arranged, then source CPS can by and this sub-district under Icc interface between the CPS know the resource information of this sub-district, and then optimize Target cell, and by the resource information request notification source E-Node B of receiveing the response.Under this scene,, then need to implement to stride CPS territory handoff procedure if the selected objective target sub-district belongs to another CPS.
In striding CPS territory switching implementation process, source CPS and target CPS consult to switch required resource and notification source E-Node B, start the switching of UE execution by source E-Node B to Target cell, and by the switching (relevant information that in request message contain target E-Node B) of source E-Node B to CN request corresponding data link.And other such as resource pre-configured with physical layer synchronously and the forward pass process of the metadata cache of E-Node B mechanism necessary data with handoff procedure is identical substantially, do not repeat them here.
By said process as seen, the influence for service feature mainly is a HO-break duration.In the present invention, the parallel processing strategy by to the handoff procedure of data path conversion and Radio Resource can shorten HO-break duration effectively.Simultaneously, the resource reservation mechanism that handoff procedure is introduced in target E-Node B helps shortening HO-break duration equally.And the UE that introduces in the UE side initiatively presynchronization mechanism can effectively shorten time of L1 synchronizing process, it is consuming time further to reduce handoff.
In addition, CPS has the multidate information that the Radio Resource availability of cell-level and relevant E-Node B handle degree of loading, and when carrying out between E-Node B handoff procedure, source E-Node B can optionally use these information and executing Target cell preferred process.Therefore, can in handoff procedure, reduce because complexity and the extra time delay expense that resource information is consulted introducing between service E-Node and candidate's the target E-Node B.Carry out handoff procedure and candidate target E-Node B separately when common factor is arranged when a plurality of UE are concurrent, CPS can demarcate (taking) mechanism by introduce resource in the pre-configured process of resource, the mutual exclusion mechanism in the computer system just, eliminate Target cell selection result and the unmatched situation of resource availability that collision causes safely, further improved the success rate of handoff procedure.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (21)
1, a kind of wireless communication system is characterized in that, comprising: a plurality of evolution base station E-Node B that evolution core net Evolved CN, at least one chain of command server CPS and each CPS have under its command;
Described Evolved CN is responsible for and being connected of other networks and communicating by letter and management to user equipment (UE); Described E-Node B directly connects by IP network and Evolved CN, is used to finish the processing of wave point physical layer protocol, the management and the switching controls of user equipment (UE) between different E-Node B of self Radio Resource; Described CPS connects by the E-Node B that the Icn interface has under its command with it, is used to its E-Node B that has under its command that many cell managements strategy is provided, and the target E-Node B that selects suitable Target cell and follow for it when E-Node B need switch.
2, system according to claim 1 is characterized in that, described CPS comprises:
Many cell managements policy library is used to store many cell managements strategy;
The cell radio resource information bank is used to store the wireless resource information of each sub-district of E-Node B that CPS has under its command.
3, system according to claim 1 is characterized in that, described E-Node B comprises:
The base station wireless resource information bank, the wireless resource information that is used to store E-Node B;
The base station wireless resource administration module is used for independently finishing according to the information of base station wireless resource information bank the management of himself Radio Resource; The management that described base station wireless resource administration module carries out self Radio Resource comprises: to the control of switching between different districts under the distribution and the integration of resource, the control of admitting data re-transmission between management, congestion management, communication link monitoring, data packet dispatching, power control and the user equipment (UE), the E-Node B;
Many cell managements strategy, Target cell that provides according to CPS and the target E-Node B that follows are provided the switching controls module, carry out switch decision and the control of UE.
4, system according to claim 3, it is characterized in that, base station wireless resource administration module among each E-Node B that described CPS has under its command with it is by Signalling exchange, the wireless resource information of each E-Node B of real-time update synchronized cells wireless resource information library storage.
5, system according to claim 1 is characterized in that, described CPS is positioned at independently on the functional node, perhaps is positioned on its any one E-Node B that has under its command.
6, system according to claim 1 is characterized in that, is finished the control of system broadcasts function by Evolved CN or E-NodeB.
7, a kind of radio resource management method based on the described wireless communication system of claim 1, described system comprises: a plurality of evolution base station E-Node B that evolution core net Evolved CN, at least one chain of command server CPS and each CPS have under its command, it is characterized in that, said method comprising the steps of:
A, E-Node B manage and report to CPS in real time the result of Radio Resource to its Radio Resource;
B, CPS by and its E-Node B that has under its command between interface receive the result of each E-Node B Radio Resource in real time;
C, be that unit sets up the Radio Resource upstate that has each sub-district under its command and handles load with the sub-district according to the result that receives;
D, when needs carry out switching between E-Node B, the many cell managements policy control that is provided according to CPS by source E-Node B is finished the handoff procedure between E-Node B.
8, method according to claim 7 is characterized in that, E-Node B comprises the process that its Radio Resource manages in the described steps A:
E-Node B distributes with reprovision, resource its Radio Resource and keeps and resource release.
9, method according to claim 8 is characterized in that, also comprises step between described step C and step D:
User equipment (UE) sends measurement report to source E-Node B, and described measurement report comprises candidate cell pilot quality information at least.
10, method according to claim 9 is characterized in that, described step D comprises:
D1, source E-Node B provide the Radio Resource upstate of candidate cell in the described measurement report and handle laod measurement to the CPS request;
D2, CPS are according to the Radio Resource upstate of the candidate cell of source E-Node B request and handle laod measurement, the target E-Node B that selects suitable Target cell to reach and follow, and provide many cell managements strategy for source E-Node B;
D3, source E-Node B control described UE and switch to described Target cell according to many cell managements strategy that CPS provides, and UE is set up and being connected of target E-Node B.
11, method according to claim 10 is characterized in that, described step D3 comprises:
D31, before UE carries out handoff procedure, source E-Node B notification target E-Node B is that UE to be accepted distributes and keep corresponding resource;
D32, target E-Node B are that notification source E-Node B can make UE enter handoff procedure after UE to be accepted distributed and keeps corresponding resource and finish,
D33, source E-Node B indication UE carries out handoff procedure;
After D34, UE switching was finished, target E-Node B indication source E-Node removed original user's face link.
12, method according to claim 11 is characterized in that, described step D32 further comprises:
When target E-Node B notification source E-Node B can make UE enter handoff procedure, request Evolved CN user carried out the data link conversion in the face of UE;
Evolved CN user carries out after data link converts in the face of UE, and the data that Evolved CN user face issues are carried out buffer memory by target E-Node B.
13, method according to claim 11 is characterized in that, described step D33 further comprises:
After source E-Node B indication UE carries out handoff procedure, before target E-Node B, change and support the harmless required user grouping of switching.
14, method according to claim 13, it is characterized in that described support is harmless switches required user grouping and comprise: source E-Node B sends to UE but does not receive the user grouping that does not send to UE as yet in user grouping that UE confirms, the source E-Node B buffer memory.
15, a kind of changing method based on the described wireless communication system of claim 1, described system comprises: a plurality of evolution base station E-Node B that evolution core net Evolved CN, at least one chain of command server CPS and each CPS have under its command, it is characterized in that, said method comprising the steps of:
(1) CPS is according to the Radio Resource upstate of the candidate cell of source E-Node B request and handle laod measurement, the target E-Node B that selects suitable Target cell to reach and follow, and provide many cell managements strategy for source E-Node B;
(2) E-Node B in source sends the handover preparation request message to target E-Node B;
(3) after target E-Node B receives described handover preparation request message, for UE to be accepted distributes and keep corresponding resource;
(4) target E-Node B after UE to be accepted becomes the distribution of work and keeps corresponding resource, sends the handover preparation acknowledge message to source E-Node B, sends data link transfer-request message to Evolved CN user face simultaneously;
(5) after E-Node B in source receives the handover preparation acknowledge message of target E-Node B response, send switching command to UE, indication UE carries out handoff procedure;
(6) after Evolved CN receives the data link transfer-request message that target E-Node B sends, carry out the data path conversion;
(7) after UE receives described switching command, reach handoff procedure synchronously to described Target cell;
(8) UE and Target cell synchronously after, send switching authentic information to target E-Node B, finish handoff procedure.
16, method according to claim 15 is characterized in that, described method further comprises step:
(9) after target E-Node B receives the switching authentic information of UE transmission, send handoff completion message to source E-Node, indication source E-Node removes original user's face link;
(10) after source E-Node receives described handoff completion message, remove original user's face link.
17, method according to claim 15 is characterized in that, described step (5) further comprises:
Source E-Node B is after UE sends switching command, change to support the harmless required user grouping of switching before target E-Node B, described user grouping comprises: source E-Node B sends to UE but does not receive the user grouping that does not send to UE as yet in user grouping that UE confirms, the source E-Node B buffer memory.
18, method according to claim 15 is characterized in that, also comprises step between described step (6) and step (7):
Evolved CN user carries out after data link converts in the face of UE, and the data that Evolved CN user face issues are carried out buffer memory by target E-Node B.
19, method according to claim 15 is characterized in that, described handover preparation request message comprises: the UE contextual information.
20, method according to claim 19 is characterized in that, described step (3) is specially:
Target E-Node B is that UE to be accepted distributes and keep corresponding resource according to the resource distribution relevant parameter in the described UE contextual information.
21, method according to claim 15 is characterized in that, when UE does not possess autonomous presynchronization function, and source E-Node B carries Target cell in the switching command that UE sends wireless parameter information.
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