CN1997217A - Resource management method and switching method of the wireless mobile communication system - Google Patents
Resource management method and switching method of the wireless mobile communication system Download PDFInfo
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Abstract
This invention relates to one wireless mobile communication system management method, which comprises the following steps: a, E-Node sets wireless materials for local area near user and reporting the set results in real time; b, CPS aligns wireless materials for down each areas according to re-stored each area relationship and each area materials boundary relationship and reported wireless materials set; c, in user switching, aim E-Node fulfills switch user materials set according to step b set.
Description
Technical field
The present invention relates to the communications field, relate in particular to the method for managing resource and the changing method of mobile radio system, particularly relevant for the method for managing resource and the changing method of evolution mobile communication system.
Background technology
In recent years, mobile communication technology develops very soon.In this process, second generation mobile communication standard has played crucial effects, but present wireless mobile communications is merely able to provide for the user data, services of telephone service and low rate.Along with Internet popularizes at the unprecedented of the whole world, the fusion of the Internet multimedia technology and the communication technology has become the development trend of future mobile.In order to satisfy the ever-increasing business demand of mobile subscriber, mobile telecom industry begins active research and disposes 3-G (Generation Three mobile communication system), can provide new services such as multimedia, packet switching and broadband mobile access, so-called third generation global system for mobile communications that Here it is future for the user.Along with the development of 3G (Third Generation) Moblie technology, the network planning and optimization work are more and more important.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.
In the RRM strategy of existing third generation mobile radio system, be limited in a certain threshold range in order to make cutting off rate, on the base station of each sub-district, reserve certain resource usually for the pre-switching user who admits.The usage criteria of this resource is that----has only the user of switching to have the right to use this part resource, and the new user who inserts can not use.Though the resource management mode of this reserved resource can promote the handover success rate of switching the user, reduced the service efficiency of resource, also strengthened the possibility that new access user is refused simultaneously.
In addition, when the switching controls of existing third generation mobile radio system, when the user switched to Target cell, Target cell needed to carry out whole scheduling according to the situation of the remaining available resource of the pre-user's who admits QoS (service quality), this sub-district and sub-district current service user's QoS etc. and distributes the pre-resource of switching the user of admitting.In handoff procedure, need to finish above-mentioned Resources allocation, increased the shared time of handoff procedure, also increased the probability that the user goes offline simultaneously.
With the TD-SCDMA system is example, its network architecture 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 NodeB (base station).NodeB is connected on the RNC by Iub interface.
In each RNC of TD-SCDMA system, carry out the management of resource by RRM (radio resource manager) usually.Described resource management comprises distribution, reprovision, resource release of resource etc.The switching user that RRM admits for each sub-district is pre-reserves a part of resource, and this part resource has only the switching user of pre-admittance just to have the right to use, and the new user who inserts does not have use.When the user initiates to insert request, be to be that basic resources is given this user resource allocation with the subband, described resource comprises its frequency resource and time interval resource.Because each RNC has a plurality of NodeB under its command, there are a plurality of users in each NodeB, so the burden of RRM is heavier.And each sub-district need be given and switch user's reserved resource, the possibility that the utilance of this a part of resource is low and the new access of increasing user is refused.
In user and NodeB communication process, because user's the mobile service range that waits other because users may leave this sub-district, just need switch to other sub-district with user's connection by handoff procedure this moment, causes communication service not interrupted.Handoff procedure is summarized as follows: at first, RNC regularly receives the measurement result that UE reports, and can whether implement the judgement of switching criterion according to this measurement result, if satisfy switching condition, then determines Target cell; Then, RNC UE positional information and other relevant information that Serving cell can be reported is sent to Target cell; Subsequently, Target cell needs the situation of remaining available resource of QoS (service quality), this sub-district according to the pre-user who admits and sub-district current service user's QoS etc. to carry out whole scheduling and distributes the pre-resource of switching the user of admitting; At last, after user and Target cell are synchronous, carry out and switch.Above-mentioned handoff procedure need switch user resource allocation for pre-the admittance, and this process increases handover delay.
Summary of the invention
The object of the present invention is to provide a kind of method for managing resource of mobile radio system, to solve in the prior art serves as that the pre-switching user who admits reserves certain resource on the base station of each sub-district, and then reduced the service efficiency of resource, also strengthened the technical problem of the possibility that new access user refused simultaneously.
Another object of the present invention is to provide a kind of changing method of mobile radio system, to need in handoff procedure in the solution prior art serves as that pre-the admittance switched user resource allocation, this process increases handover delay, the technical problem of the possibility that the increase user goes offline.
For addressing the above problem, the invention discloses a kind of method for managing resource of mobile radio system, described system comprises: a plurality of evolution base station E-NodeB that evolution core net Evolved CN, one or more chain of command server CPS and each CPS have under its command said method comprising the steps of:
(1) E-NodeB is the user's allocation radio resource of close E-NodeB in this sub-district, and reports the configuration result of E-NodeB Radio Resource in real time to CPS;
(2) the radio-resource-configuration result that reports according to syntople, each local resource restricting relation and E-NodeB between each sub-district of preserving in advance of CPS is near the Cell Edge User allocation radio resource in each sub-district that has under its command;
(3) when the user switches, target E-NodeB finishes described switching user's resource distribution according to the Radio Resource of step (2) configuration.
Step (1) also comprises before: E-NodeB sets the fringe region of sub-district, and the user of sub-district decline edge region is the user near cell edge, otherwise the user is in the sub-district near the E-NodeB zone.
Step (1) also comprises before: when the user initiated to insert request, E-NodeB judged that earlier the user is in the position of sub-district, if be positioned at the fringe region of sub-district, then carry out step (2), otherwise carries out step (1).
The user is in communication process, and E-NodeB detects the fringe region that described user enters the sub-district, carries out step (2).
Step (2) is specially: (21) CPS need to determine the user's of allocation radio resource cell-of-origin; (22) CPS finds the close information of adjacent cells of described user according to the syntople of cell-of-origin; (23) CPS gives described user's distributing radio resource based on the principle of quadrature between the Radio Resource of neighbor cell edge customer.
Step (3) is specially: (31) Target cell is when inserting user's resource allocation in advance, if the source resource allocation that step (2) disposes to the user drops in the preset threshold value scope at the communication quality of Target cell, then to adopt the source resource allocation; (32), then calculate and reconfigure the switching user resources according to described quality of services for users QoS if the user source resource allocation drops on outside the predetermined threshold value scope at the communication quality of Target cell.
The present invention also comprises: after (4) handoff procedure finishes, the source resource allocation that switches the user is fused in the Target cell resource pool, so that carry out the shared unified scheduling of resource.
Step (1) also comprises before: E-NodeB is divided into edge bandwidth resources and midbandwidth resource for this sub-district usable bandwidth resources; To adopt full range/time domain space be user's configured bandwidth resource of close E-NodeB in the heart bandwidth resources therefrom to E-NodeB in the step (1); CPS utilizes the frequency spectrum resource restricting relation of each sub-district to be close Cell Edge User configured bandwidth Radio Resource in each sub-district that has under its command from the edge bandwidth resources in the step (2).
The invention discloses a kind of changing method of mobile radio system, described system comprises: a plurality of evolution base station E-NodeB that one or more chain of command server CPS that evolution core net Evolved CN, Evolved CN have under its command and each CPS have under its command, said method comprising the steps of: the user's that (1) CPS provides according to source E-NodeB measurement report, select target sub-district and the target E-NodeB that follows; (2) CPS/ source E-NodeB sends the handover preparation request message to target E-NodeB, and described handover preparation request message carries user source allocation radio resource information at least; (3) after target E-NodeB receives the handover preparation request message,, and return handover preparation to CPS/ source E-NodeB and confirm according to user source allocation radio resource information configuration switchable resource; (4) CPS/ source E-NodeB is to the switching of Evolved CN request msg link, and to the initiation that the user indicates handoff procedure, carries switchable resource information in the described Indication message; (5) user initiates synchronously to target E-NodeB according to the switchable resource information of indication; (6) finish synchronously after, the user receives data and the Radio Resource of source of release E-NodeB from target E-NodeB.
Step (1) also comprises before: the user initiates to insert request or user's communication process, if detect the fringe region that the user is in the sub-district, the Radio Resource result that syntople, each local resource restricting relation and the E-NodeB between each sub-district that CPS preserves in advance based on the principle basis of quadrature between the Radio Resource of neighbor cell edge customer reports is described user's dynamic-configuration Radio Resource.
The fringe region that the user is in the sub-district is to detect by following steps to obtain: obtain user's pilot frequency information from the measurement report of reporting of user, when user's pilot frequency intensity during less than the fringe region threshold value, described user is in the fringe region of sub-district.
Step (3) is specially: (31) target E-NodeB when inserting user's resource allocation in advance, if the user source resource allocation drops in the preset threshold value scope at the communication quality of Target cell, then adopts the user source allocation radio resource; (32) if the user carries resource and drops on outside the predetermined threshold value scope at the communication quality of Target cell, then calculate and the configure user resource according to described quality of services for users QoS; (33) target E-NodeB returns the handover preparation acknowledge message to CPS/ source E-NodeB.
Also comprise between step (4) and the step (5): source E-NodeB changes before target E-NodeB and supports the harmless required user grouping of switching, and described user grouping comprises: source E-NodeB sends to UE but does not receive the grouped data that does not send to UE as yet in user grouping that UE confirms, the source E-NodeB buffer memory.
Step (4) further comprises: 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.
The present invention also comprises: after handoff procedure finishes, the source resource allocation that switches the user is fused in the Target cell resource pool, so that carry out the shared unified scheduling of resource.
Compared with prior art, the present invention has the following advantages: the present invention finishes user's resource allocation jointly by E-NodeB and CPS: as user during near the E-NodeB of this sub-district, by the direct allocation radio resource of E-NodeB, when the user when this cell edge region, dynamically be its Resources allocation by CPS.This dynamic interference coordination implementation of strategies result based on the cell edge UE on the OFDM technical foundation is exactly a quadrature between each user's radio resource of neighbor cell edge, the user who switches can carry resource and switch, do not need the sub-district in the radio-resource-configuration process, to reserve switchable resource or less reserve switchable resource for switching the user in advance, improved the service efficiency of cell radio resource.And, carry resource owing to switch UE, so implementing the pre-configured process of resource, target BS can be optimized, promptly needn't be to use the original resource relevant configured parameter of UE according to the on-the-spot required resource of UE of calculating of the QoS that switches UE.Like this, can accelerate the resource preparation process of target E-NodeB, improve the speed of whole handoff procedure.
Description of drawings
Fig. 1 is the network architecture schematic diagram of TD-SCDMA system;
Fig. 2 is the UTRAN structural representation;
Fig. 3 A is a kind of network architecture schematic diagram of evolution wireless communication system;
Fig. 3 B is the network architecture schematic diagram of another kind of evolution wireless communication system;
Fig. 4 is the flow chart of the method for managing resource of evolution mobile communication system of the present invention;
Fig. 5 is that one of UE (user) wireless resource multiplexing scene is implemented schematic diagram;
Fig. 6 is the instance graph of cell edge region definition;
Fig. 7 is the flow chart of the changing method of wireless communication system of the present invention;
Fig. 8 is the flow chart that switch the sub-district of the CPS master control of wireless communication system of the present invention;
Fig. 9 is the flow chart that switch the sub-district of the E-NodeB master control CPS assistance of wireless communication system of the present invention.
Embodiment
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 A, Fig. 3 A is the network architecture schematic diagram of a kind of wireless communication system of the present invention:
Three kinds of functional entitys are arranged: (1) evolution core net EvolvedCN in the wireless communication system architecture of the present invention; (2) chain of command server CPS; (3) evolution base station E-NodeB.Wherein, an Evolved CN can have at least one CPS and a plurality of E-NodeB under its command, and a CPS can have a plurality of E-NodeB 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-NodeB, 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-NodeB resource and the closely-related radio resource management function of characteristic by E-NodeB, and with CPS finishes and many sub-districts and whole network are closely related radio resource management function (for example: the management of the handoff procedure between E-NodeB).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 it realizes many cell managements function, also can realize the control of MBMS (multimedia broadcast/multi broadcast business), the control of network sharing functionality, the control of system broadcasts function and the abstraction function of KPI (critical performance parameters).
E-NodeB: the NodeB 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-NodeB self RRM, for example: resource allocation and integration, admit management, congestion management, the communication link monitoring, data packet dispatching and power control, functions such as the control of switching between different districts under the E-NodeB, be main finishing by CPS promptly, and E-NodeB independently finish and own resource and the closely-related radio resource management function of characteristic with many cell managements and the closely-related radio resource management function of network.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-NodeB 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-NodeB.In order to carry out high efficiency RRM, E-NodeB also finishes the control that UE is measured.
E-NodeB 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-NodeB.In chain of command, the signaling moiety of self radio resource management function that E-NodeB independently bears directly is connected with Evolved CN, finishes professional foundation, maintenance and release function.
Connect by Iu ' interface between CPS and the Evolved CN, data link transfer-request that CPS initiates and MBMS, network share and KPI parameter extraction etc. and Evolved CN between all send alternately through interface thus.
Connect by the Icn interface between CPS and the E-NodeB, E-NodeB to CPS provide UE measure in the corresponding measurement report of many cell managements, and report its other resources situation and handle load condition to CPS in real time.CPS carries out switch decision and the control of UE according to RRM (RRM) strategy on the basis of UE measurement report and E-NodeB resource situation and processing information on load.Simultaneously, MBMS among the CPS, network are shared control information such as KPI parameter and are also assigned to E-NodeB through interface thus.The required UE Context (UE context) of handoff procedure is also through reaching target E-NodeB under the interface thus.Algorithm and relevant parameter that E-NodeB carries out using in the RRM process are also set and are changed by CPS.
Icc interface between the CPS is used for auxiliary CPS and finishes the UE switching controls of striding CPS.
Inn interface between the E-NodeB is used to and supports the required forward data of harmless switching that data channel is provided.
According to the practical application needs, the control of system broadcasts function can be finished on Evolved CN or CPS entity, also can directly be controlled by E-NodeB.
The Evolved CN CPS that also can get along well connects, and directly is connected with E-NodeB.Please refer to Fig. 3 B, it is the network architecture schematic diagram of another kind of evolution wireless communication system.E-NodeB 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-NodeB.In chain of command, the signaling moiety of self radio resource management function that E-NodeB 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-NodeB, network are shared, function relevant informations such as system broadcasts control and KPI parameter extraction are also through interface and Evolved CN carry out alternately thus.
CPS is mainly its E-NodeB that has under its command each cell radio resource management information and many cell managements strategy is provided, and selects suitable Target cell and the target E-NodeB that follows for it when E-NodeB need switch.
OFDM (OFDM) technology is a kind of multi-carrier digital communications technology, and it is by multi-carrier modulation (MCM) technical development, and each subcarrier that its distinguishing feature is its utilization is mutually orthogonal.The basic principle of this technology is high-speed serial data to be transformed to the parallel data of the relative low speed of multichannel and different carrier waves is modulated.Above-mentioned disclosed evolution mobile communication system uses the OFDM technology to carry out transfer of data, and in order to obtain higher frequency spectrum service efficiency, the little frequency reuse of trying one's best is used in expectation.Though ideal frequency reuse is 1,, and disturb the lifting of the throughput and the user performance that must limit the sub-district if the multiplexing coefficient 1 of fixed frequency is then introduced bigger interference inevitably between neighbor cell.For this reason, the invention provides a kind of method for managing resource.See also Fig. 4, it is the flow chart of the method for managing resource of evolution mobile communication system of the present invention.It comprises:
S110:E-NodeB is the user's allocation radio resource of close E-NodeB in this sub-district, and reports the configuration result of E-NodeB Radio Resource in real time to CPS.
The radio-resource-configuration result that S120:CPS reports according to syntople, each local resource restricting relation and E-NodeB between each sub-district of preserving in advance is near the Cell Edge User allocation radio resource in each sub-district that has under its command.
The present invention takes into full account the interference characteristic based on the OFDM cellular cell, be the user's distributing radio resource in full range/time domain space (frequency reuse 1) of close E-NodeB in the sub-district, and user's frequency of utilization dynamic multiplexing technology of close cell edge is based on the principle distributing radio resource of quadrature between the neighboring edge user's radio resource.
At first, E-NodeB sets the fringe region of sub-district, and the user who is arranged in cell edge region is the user of step S120 near cell edge.E-NodeB can set the fringe region threshold value, and the value of user's correspondence and fringe region threshold value compare, thereby the fringe region that definite user is positioned at the sub-district still is positioned near the E-NodeB zone.Such as, E-NodeB can set the fringe region pilot threshold based on signal pilot intensity, obtain user's signal pilot intensity from the measurement report of reporting of user, when user's signal pilot intensity greater than default fringe region pilot threshold, then the user is positioned near the E-NodeB zone, otherwise the user is positioned at the fringe region of sub-district;
Then, when the user initiated to insert request, E-NodeB judged that the user is in the position of sub-district, when being near the E-NodeB zone, and then by the E-NodeB distributing radio resource, and to the configuration result of CPS real-time report E-NodeB Radio Resource.When the fringe region that is in the sub-district, then by the CPS allocation radio resource.
When the user is in the communication process, E-NodeB detects the residing position of user in real time, if the user enters the fringe region of sub-district, dynamically is this user's distributing radio resource by CPS then.
The CPS allocation radio resource is specially: (21) CPS need to determine the user's of allocation radio resource cell-of-origin; (22) CPS finds the close information of adjacent cells of described user according to the syntople of cell-of-origin; (23) CPS gives described user's distributing radio resource based on the principle of quadrature between the Radio Resource of neighbor cell edge customer.
That is to say that the user's radio resource distribution that is positioned at cell edge region is to need to consider the neighbor cell influence and the restriction of resource allocation---so the distribution of its frequency spectrum is that condition is limited.That is, frequency reuse is greater than 1, and changes with resource dynamic with neighbor cell.
See also Fig. 5, it is that one of UE (user) wireless resource multiplexing scene is implemented schematic diagram.With reference to Fig. 5, specify resource distribution.
Being in three UE in the sub-district 1 (identifies with round dot, squares and triangles respectively, and called after UE successively in the drawings
a, UE
bAnd UE
c) because residing interference environment difference should adopt different dynamic multiplexing parameters:
1. for UE
a, because it is in the sub-district 1 comparatively the zone near E-NodeB, thus its adjacent area interference that is subjected to a little less than, can the traffic affecting normal operation, can in full range/time domain space, be its distributing radio resource;
2. for giving UE
b, it is in the junction of sub-district 1 and sub-district 3---and promptly be in the edge of sub-district 1, this moment, the configuration guidelines that not only will follow in the sub-district 1 should be taken into account the possibility that sub-district 3 applies interference simultaneously during distributing radio resource, must give UE
bEvade the resource that has disposed in the sub-district 3 during allocation radio resource;
3. for UE
c, because its residing position is more special, during allocation radio resource, the configuration guidelines that should follow in the sub-district 1 is evaded the resource that has disposed in sub-district 3 and the sub-district 2 again.
Please refer to Fig. 6, it is the instance graph of cell edge region definition.Suppose that bandwidth available in certain sub-district is Ω, is divided into two parts bandwidth resources: bandwidth resources A and bandwidth resources B with it.Fall into user's utilized bandwidth resource B of fringe region in the sub-district, and be positioned at this sub-district and be positioned at the outer user's utilized bandwidth resource A of fringe region.Wherein, the user of utilized bandwidth resource A, based on the characteristics of OFDM technology the multiplexing coefficient of its bandwidth resources can be set is 1, can directly be disposed by E-NodeB in the resource distribution process, needn't consider the interference of adjacent sub-district, the multiplexing static multiplex mechanism that is referred to as of above-mentioned bandwidth resources.And the user of utilized bandwidth resource B, owing to be in the fringe region, must consider the interference problem of adjacent sub-district, implement dynamic-configuration, the multiplexing dynamic multiplexing mechanism that is referred to as of above-mentioned bandwidth resources based on the local resource information that CPS grasped by E-NodeB and CPS cooperation in the user resources layoutprocedure.In general, resource distribution process of the present invention has organically combined the dynamic and static multiplex mechanism of resource.
In concrete application, can determine concrete decision threshold according to the measurement result that UE reports.Fringe region should be approximate belt zone in the sub-district.It is 1 that its status indication EDGERING is set when UE falls into fringe region; And UE is provided with its status indication EDGERING when not falling into fringe region is 0.CPS and E-NodeB obtain the position of UE sub-district of living in according to status indication EDGERING, so that finish the resource distribution of follow-up UE.
S130: when the user switched, target E-NodeB finished described switching user's resource distribution according to the Radio Resource of step S120 configuration.
By above-mentioned resource distribution process, obtained this technical result of quadrature between each user's radio resource of neighbor cell edge.When the user switches, the resource that target E-NodeB can directly adopt source E-NodeB to be dispensed to this user is given this user as Target cell resource distribution, this user carries the process that resource is switched, can when the radio configuration of sub-district, economize and slightly switch the user and reserve switchable resource, improve the service efficiency of whole cell radio resource.
Above-mentioned steps S130 is when switching user's resource allocation at Target cell, target E-NodeB can directly adopt user's the resource that carries, also can be preferentially with reference to this user's the resource that carries, such as carrying resource as the user when the good communication quality of Target cell, directly adopt user's the resource that carries to be this user configured resource as this Target cell, if the user carries resource when the communication quality of Target cell is not good, can adopt alternate manner configure user resource, calculate and the configure user resource such as QoS according to UE.Its specific implementation process is as follows:
(31) Target cell is when inserting user's resource allocation in advance, if the source resource allocation that step S120 disposes to the user drops in the preset threshold value scope at the communication quality of Target cell, then to adopt the source resource allocation;
(32), then calculate and reconfigure the switching user resources according to described quality of services for users QoS if the user source resource allocation drops on outside the predetermined threshold value scope at the communication quality of Target cell.
And, after handoff procedure finishes, the source resource allocation that switches the user is fused in the Target cell resource pool, so that carry out the shared unified scheduling of resource.
By above-mentioned layoutprocedure, UE carries resource switch and combines with original resource preparation process, can effectively prevent the special screne that target resource is unusual, promotes success rate for switching; Also reduced simultaneously the possibility of in handoff procedure, introducing preemption mechanism.
Resource-based dynamic and static multiplex mechanism, the present invention provides a kind of changing method of evolution wireless communication system on this basis.See also Fig. 7, it is the flow chart of this changing method.It may further comprise the steps:
The user's that S210:CPS provides according to source E-NodeB measurement report, select target sub-district and the target E-NodeB that follows.
Before step S210, entire wireless communication system need be carried out user's resource allocation in advance: the user initiates to insert request or user's communication process, if detect the fringe region that the user is in the sub-district, the Radio Resource result that syntople, each local resource restricting relation and the E-NodeB between each sub-district that CPS preserves in advance based on the principle basis of quadrature between the Radio Resource of neighbor cell edge customer reports is described user's dynamic-configuration Radio Resource.The fringe region that the user is in the sub-district is to detect by following steps to obtain: obtain user's pilot frequency information from the measurement report of reporting of user, when user's pilot frequency intensity during less than the fringe region threshold value, described user is in the fringe region of sub-district.
UE sends measurement report to source E-NodeB, and described measurement report comprises candidate cell pilot quality information at least; Source E-NodeB reports CPS with the measurement report received by the interface between itself and the CPS; The measurement report of the UE that CPS provides according to source E-NodeB and write down the Radio Resource upstate of each sub-district and the target E-NodeB that handles load select target sub-district and follow.
S220:CPS/ source E-NodeB sends the handover preparation request message to target E-NodeB, and described handover preparation request message carries user source allocation radio resource information at least.
The implementation procedure of switching comprises the handoff procedure of CPS master control and two kinds of implementations of handoff procedure of E-NodeB master control/CPS association control, and this two kinds of implementations are specifically introduced in back extended meeting.These two kinds switch the initiation node that implementation process is implemented in handover decisions, resource is prepared the message such as transfer-request of request and data link and have difference-----CPS or relevant E-NodeB.
CPS/ source E-NodeB sends the handover preparation request message to target E-NodeB, requires target E-NodeB to carry out the preparation of switchable resource.In the handover preparation request message, need to carry user source allocation radio resource information and the relevant QoS of UE.
After S230: target E-NodeB receives the handover preparation request message,, and return handover preparation to CPS/ source E-NodeB and confirm according to user source allocation radio resource information configuration switchable resource.
The resource distribution that target E-NodeB can directly adopt user source allocation radio resource information as Target cell the user to be carried out.It is when inserting user's resource allocation in advance that target E-NodeB also can adopt following configuration mode configuration to switch user's resource: target E-NodeB, if the user source resource allocation drops in the preset threshold value scope at the communication quality of Target cell, then adopt the user source allocation radio resource; If the user carries resource and drops on outside the predetermined threshold value scope at the communication quality of Target cell, then calculate and the configure user resource according to described quality of services for users QoS.
After resource distribution, target E-NodeB returns the handover preparation acknowledge message to CPS/ source E-NodeB, and described message can also determine whether to carry for switching user configured resource except carrying switching time as required.Such as, when target E-NodeB directly adopts the resource distribution that user source allocation radio resource information carries out the user as Target cell, target E-NodeB can carry the resource (user source allocation radio resource) of configuration in the handover preparation acknowledge message, also can adopt default method, promptly not carry the resource or the employing of configuration and indicated someway; The resource distribution of not adopting user source allocation radio resource information the user to be carried out as target E-NodeB as Target cell, but calculate and during the configure user resource, target E-NodeB should carry in the handover preparation acknowledge message to switching the resource information that the user reconfigures according to described quality of services for users QoS.
S240:CPS/ source E-NodeB is to the switching of Evolved CN request msg link, and to the initiation that the user indicates handoff procedure, carries switchable resource information in the described Indication message.Described switchable resource information is included as described switching user's resource allocation and switching time.
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-NodeB.
S250: the user initiates synchronously to target E-NodeB according to the switchable resource information of indication.
S260: after finishing synchronously, the user receives data from target E-NodeB, and the Radio Resource of source of release E-NodeB.
In order to support harmless the switching, between step S240 and step S250, source E-NodeB changes before target E-NodeB and supports the harmless required user grouping of switching, and described user grouping comprises: source E-NodeB sends to UE but does not receive the grouped data that does not send to UE as yet in user grouping that UE confirms, the source E-NodeB buffer memory.
After handoff procedure finishes, the source resource allocation that switches the user is fused in the Target cell resource pool, so that carry out the shared unified scheduling of resource.
Among the concrete process of implementing to switch, because the handoff time delay that can bear of class business is less relatively in real time, and its required resource also is metastable, implements to switch so be very suitable for using the resource that UE carries.
The present invention is based on the advantage of OFDM technology and the technical characterstic of Cell Edge User dynamic interference coordination, proposed under mobile subscriber's handoff scenario, the new method of Target cell switchable resource configuration.This method has been quickened the synchronizing process of mobile subscriber to Target cell when improving the Radio Resource service efficiency, help to shorten the break period that handoff procedure causes.
In order to make those skilled in the art person understand the present invention program better, Fig. 8 shows the flow process that switch the sub-district of the CPS master control of wireless communication system of the present invention:
1.UE behind the connecting system, regularly carry out the cell measurement process, and measurement result reported CPS by source E-NodeB.
2.CPS each candidate cell pilot quality and each local resource availability and processing laod measurement according to UE reports according to predefined RRM strategy and handover decisions, optimize reasonable target sub-district and the target E-NodeB that follows.
3.CPS send handover preparation request (Handover preparation request) message to target E-Node B, in this message, carry the UE contextual information, in the UE contextual information, comprise UE source allocation radio resource information and be used for the pre-configured required relevant parameter of computational resource, such as QoS (service quality) parameter.
4. target E-NodeB is after UE to be accepted successfully disposes respective resources, sends handover preparation to CPS and confirms (Handover preparation Confirm) message, and it has finished the assigning process of resource report CPS.
The resource distribution that target E-NodeB can directly adopt user source allocation radio resource information as Target cell the user to be carried out.It is when inserting user's resource allocation in advance that target E-NodeB also can adopt following configuration mode configuration to switch user's resource: target E-NodeB, if the user source resource allocation drops in the preset threshold value scope at the communication quality of Target cell, then adopt the user source allocation radio resource; If the user carries resource and drops on outside the predetermined threshold value scope at the communication quality of Target cell, then calculate and the configure user resource according to described quality of services for users QoS.
5.CPS after receiving that the handover preparation of target E-NodeB response is confirmed (Handover preparationConfirm) message, send switching command (Handover commit) by source E-NodeB to UE, indication UE carries out handoff procedure.
6. simultaneously, initiate data path transfer-request (Path Switch Request) message to Evolved CN, this message and switching command are initiated synchronously, so that L1 (physical layer) synchronizing process and data path switching process executed in parallel reduce the break period of switching effectively.
7.Evolved CN carries out corresponding data link switching process after receiving data path transfer-request (Path Switch Request) message; After data link converted, the data that Evolved CN issues were by the target NodeB buffer memory.
8. after source E-NodeB receives the Handover commit order that CPS issues, before target E-NodeB, change necessary user grouping.Necessary user grouping comprises:
(a) source E-NodeB 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-NodeB buffer memory to UE.
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-NodeB need change necessary user grouping before target E-NodeB.
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 to CPS, report that its switching to Target cell finishes by target E-NodeB.
11.CPS after receiving switching authentic (Handover confirm) message of UE response, send user's face to service E-NodeB and discharge request (UP release Request) message, indication source E-NodeB removes original user's face link; Source E-NodeB implements to tear chain process open and make corresponding response, sends user's face to CPS and discharges response (UP release Response) message.
So far, the cell switch process under the whole C PS control is finished.
Fig. 9 shows the flow process that switch sub-district that the E-NodeB master control CPS of wireless communication system of the present invention assists:
21.UE behind the connecting system, regularly carry out the cell measurement process, and measurement result reported to source E-NodeB.
22, source E-NodeB sends many cell informations request message to CPS, and the many cell informations that return by CPS are receiveed the response and determined Target cell and the target E-NodeB that follows.
Many cell informations request message is used for source E-NodeB and confirms Target cell that this time switches and the target E-NodeB that follows to the CPS request.Each candidate cell pilot quality and each local resource availability and processing laod measurement that CPS reports according to UE, according to predefined RRM strategy and handover decisions, optimize reasonable target sub-district and the target E-NodeB that follows, and the target E-NodeB of receiveing the response and returning Target cell and follow by many cell informations.
23. source E-NodeB sends handover preparation request (Handover preparationrequest) message to target E-NodeB, in this message, carry the UE contextual information, in the UE contextual information, comprise UE source allocation radio resource information and be used for the pre-configured required relevant parameter of computational resource, such as QoS (service quality) parameter.
24. target E-NodeB is UE to be accepted successfully dispose respective resources after, send handover preparation to source E-NodeB and confirm (Handover preparation Confirm) message, it has finished the assigning process of resource report source E-NodeB.
The resource distribution that target E-NodeB can directly adopt user source allocation radio resource information as Target cell the user to be carried out.It is when inserting user's resource allocation in advance that target E-NodeB also can adopt following configuration mode configuration to switch user's resource: target E-NodeB, if the user source resource allocation drops in the preset threshold value scope at the communication quality of Target cell, then adopt the user source allocation radio resource; If the user carries resource and drops on outside the predetermined threshold value scope at the communication quality of Target cell, then calculate and the configure user resource according to described quality of services for users QoS.
25. source E-NodeB sends switching command (Handover commit) to UE after receiving that the handover preparation of target E-NodeB response is confirmed (Handoverpreparation Confirm) message, indication UE carries out handoff procedure.
26. simultaneously, initiate data path transfer-request (Path Switch Request) message to Evolved CN, this message and switching command are initiated synchronously, so that L1 (physical layer) synchronizing process and data path switching process executed in parallel reduce the break period of switching effectively.
27.Evolved CN carries out corresponding data link switching process after receiving data path transfer-request (Path Switch Request) message; After data link converted, the data that Evolved CN issues were by the target NodeB buffer memory.
28. source E-NodeB changes necessary user grouping and UE contextual information before target E-NodeB.Necessary user grouping comprises:
(a) source E-NodeB 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-NodeB buffer memory to UE.
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-NodeB need change necessary user grouping before target E-NodeB.
29.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.
30.UE after obtaining synchronously with Target cell, respond switching authentic (Handover confirm) message to target E-NodeB, report that its switching to Target cell finishes by source E-NodeB.
31. remove original user's face link, discharge original user's face.
So far, whole cell switch process is finished.
Switch for the sub-district of striding CPS, divide timing, can consult finish user's resource allocation, to guarantee that be quadrature between the user's radio resource at the neighbor cell edge of different CPS by two CPS in the user resources of carrying out in advance.
When switching in the sub-district, CPS just knows candidate cell and E-NodeB 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 according to the boundary information of the topological structure that has the sub-district under its command and in abutting connection with CPS information by analyzing the candidate cell sign of UE in the measurement message that E-NodeB reports.If the candidate cell under other CPS territories is arranged, then source CPS can by with this sub-district under CPS know the resource information of this sub-district by Icc interface between the two, and then make the judgement of selected objective target sub-district.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 the implementation process, target E-NodeB is when switching user's resource allocation, equally can be preferentially with reference to this user's the resource that carries, and optimization aim E-NodeB implements the pre-configured process of resource, improves whole 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 (15)
1, a kind of method for managing resource of mobile radio system, described system comprises: a plurality of evolution base station E-NodeB that evolution core net Evolved CN, one or more chain of command server CPS and each CPS have under its command, it is characterized in that, said method comprising the steps of:
(1) E-NodeB is the user's allocation radio resource of close E-NodeB in this sub-district, and reports the configuration result of E-NodeB Radio Resource in real time to CPS;
(2) the radio-resource-configuration result that reports according to syntople, each local resource restricting relation and E-NodeB between each sub-district of preserving in advance of CPS is near the Cell Edge User allocation radio resource in each sub-district that has under its command;
(3) when the user switches, target E-NodeB finishes described switching user's resource distribution according to the Radio Resource of step (2) configuration.
2, the method for claim 1 is characterized in that, step (1) also comprises before:
E-NodeB sets the fringe region of sub-district, and the user of sub-district decline edge region is the user near cell edge, otherwise the user is in the sub-district near the E-NodeB zone.
3, method as claimed in claim 2 is characterized in that, step (1) also comprises before:
When the user initiated to insert request, E-NodeB judged that earlier the user is in the position of sub-district, if be positioned at the fringe region of sub-district, then carry out step (2), otherwise carries out step (1).
4, method as claimed in claim 2 is characterized in that, also comprises:
The user is in communication process, and E-NodeB detects the fringe region that described user enters the sub-district, carries out step (2).
5, method as claimed in claim 1 or 2 is characterized in that, step (2) is specially:
(21) CPS need to determine the user's of allocation radio resource cell-of-origin;
(22) CPS finds the close information of adjacent cells of described user according to the syntople of cell-of-origin;
(23) CPS gives described user's distributing radio resource based on the principle of quadrature between the Radio Resource of neighbor cell edge customer.
6, method as claimed in claim 1 or 2 is characterized in that, step (3) is specially:
(31) Target cell is when inserting user's resource allocation in advance, if step (2) configuration drops in the preset threshold value scope for user's source resource allocation at the communication quality of Target cell, then to adopt the source resource allocation;
(32), then calculate and reconfigure the switching user resources according to described quality of services for users QoS if the user source resource allocation drops on outside the predetermined threshold value scope at the communication quality of Target cell.
7, as claim 5 or 6 described methods, it is characterized in that, also comprise:
(4) after handoff procedure finishes, the source resource allocation that switches the user is fused in the Target cell resource pool, so that carry out the shared unified scheduling of resource.
8, method as claimed in claim 2 is characterized in that,
Step (1) also comprises before: E-NodeB is divided into edge bandwidth resources and midbandwidth resource for this sub-district usable bandwidth resources;
To adopt full range/time domain space be user's configured bandwidth resource of close E-NodeB in the heart bandwidth resources therefrom to E-NodeB in the step (1);
CPS utilizes the frequency spectrum resource restricting relation of each sub-district to be close Cell Edge User configured bandwidth Radio Resource in each sub-district that has under its command from the edge bandwidth resources in the step (2).
9, a kind of changing method of mobile radio system, described system comprises: a plurality of evolution base station E-NodeB that one or more chain of command server CPS that evolution core net Evolved CN, Evolved CN have under its command and each CPS have under its command, it is characterized in that, said method comprising the steps of:
(1) user's that provides according to source E-NodeB of CPS measurement report, select target sub-district and the target E-NodeB that follows;
(2) CPS/ source E-NodeB sends the handover preparation request message to target E-NodeB, and described handover preparation request message carries user source allocation radio resource information at least;
(3) after target E-NodeB receives the handover preparation request message,, and return handover preparation to CPS/ source E-NodeB and confirm according to user source allocation radio resource information configuration switchable resource;
(4) CPS/ source E-NodeB is to the switching of Evolved CN request msg link, and to the initiation that the user indicates handoff procedure, carries switchable resource information in the described Indication message;
(5) user initiates synchronously to target E-NodeB according to the switchable resource information of indication;
(6) finish synchronously after, the user receives data and the Radio Resource of source of release E-NodeB from target E-NodeB.
10, method as claimed in claim 9 is characterized in that, step (1) also comprises before:
The user initiates to insert request or user's communication process, if detect the fringe region that the user is in the sub-district, the Radio Resource result that syntople, each local resource restricting relation and the E-NodeB between each sub-district that CPS preserves in advance based on the principle basis of quadrature between the Radio Resource of neighbor cell edge customer reports is described user's dynamic-configuration Radio Resource.
11, method as claimed in claim 10 is characterized in that, the fringe region that the user is in the sub-district is to detect by following steps to obtain:
Obtain user's pilot frequency information from the measurement report of reporting of user, when user's pilot frequency intensity during less than the fringe region threshold value, described user is in the fringe region of sub-district.
As claim 9 or 10 described methods, it is characterized in that 12, step (3) is specially:
(31) target E-NodeB when inserting user's resource allocation in advance, if the user source resource allocation drops in the preset threshold value scope at the communication quality of Target cell, then adopts the user source allocation radio resource;
(32) if the user carries resource and drops on outside the predetermined threshold value scope at the communication quality of Target cell, then calculate and the configure user resource according to described quality of services for users QoS;
(33) target E-NodeB returns the handover preparation acknowledge message to CPS/ source E-NodeB.
13, as claim 9 or 10 described methods, it is characterized in that, also comprise between step (4) and the step (5):
Source E-NodeB changes before target E-NodeB and supports the harmless required user grouping of switching, and described user grouping comprises: source E-NodeB sends to UE but does not receive the grouped data that does not send to UE as yet in user grouping that UE confirms, the source E-NodeB buffer memory.
As claim 9 or 10 described methods, it is characterized in that 14, step (4) further comprises:
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.
15, as claim 9 or 10 described methods, it is characterized in that, also comprise:
After handoff procedure finishes, the source resource allocation that switches the user is fused in the Target cell resource pool, so that carry out the shared unified scheduling of resource.
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