CN1992962A - Inter-cell interference coordination method based on evolution network architecture of 3G system - Google Patents
Inter-cell interference coordination method based on evolution network architecture of 3G system Download PDFInfo
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Abstract
The invention relates to an inter-region interference cooperate method based on 3G system advanced network, wherein it comprises that: presetting region edge interference area at each region; when UE is not at the region edge interference area, the advanced base station E-Node B of advanced network will distribute wireless resource for UE to be used directly, and send resource distribute result to control server CPS; when UE is in the interference area, E-Node B and relative CPS will cooperate to distribute wireless resource to UE, and receive the response message of CPS to directly use wireless resource. The invention uses E-Node B to real-time detect the UE position and the interference cooperation of CPS, to avoid near-region interference. The invention can improve wireless utilization and improve region throughout.
Description
Technical field
The present invention relates to the mobile communication technology field, be specifically related to a kind of inter-cell interference coordination method based on the 3G system evolved network architecture.
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.For this reason, the applicant has proposed a kind of wireless communication system of the 3G system evolved network architecture in Chinese patent application 200510130159.6 and Chinese patent application 200510130160.9, as shown in Figure 1, two kinds of functional entitys are arranged in the E-UTRAN of this evolution network framework (evolution wireless access network): E-Node B (evolution base station) and CPS (chain of command server).One of them CPS can have a plurality of E-Node B under its command, in each E-Node B, comprise a radio resource managing unit, independently finish by E-Node B thereby make with E-Node B resource and the closely-related RRM of characteristic (RRM) part, and with many sub-districts and the closely-related RRM part of whole network be to lead to finish by CPS.Two entities function separately is as follows:
CPS realizes many cell managements function, grasps the resource allocation information of sub-district under the CPS territory, and the relation of the topological structure between each sub-district, comprises corresponding radio resource information bank and RRM policy library among the CPS.
E-Node B is in finishing the 3G system outside the Node B basic function, 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 and power control, the E-Node B such as control.Secondly, in order to promote the adaptive capacity of RAN (wireless 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, should contain outer retransmission mechanism (Outer-ARQ) in the upper-layer protocol of E-Node B.In order to carry out high efficiency RRM, measuring control also is the basic function of E-Node B.
Connect by the Icn interface between E-Node B and the CPS, E-Node B 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 and E-Node B are on the basis of UE measurement report and local resource situation and processing information on load, according to collaborative resource distribution and the switching controls of implementing UE of RRM strategy.Inn interface between the E-Node B is used to supports the required forward data of harmless switching that data channel is provided.The realization of interference coordination management function between UE switching controls that the Icc interface between the CPS is used for assisting CPS to finish strides CPS and CPS territory edge cell.CPS by with E-Node B between interface dynamically receive the relevant process of idle wireless resource, being the result of processes such as resource allocation/reprovision, resource reservation and resource release, is that unit sets up the Radio Resource upstate that has each sub-district under its command and handles the load topology information with the sub-district.
Future broadband wireless communication systems expectation can provide the high-speed data communication ability, and the shortage of this and frequency spectrum resource contradicts.Therefore, how under limited frequency spectrum resources, improve spectrum efficiency and data pass rate, become one of key issue of future broadband wireless communication systems.OFDM becomes one of mainstream technology of present solution high speed data transfer because it has higher spectrum efficiency and anti-multipath interference capability.OFDM belongs to multi-carrier modulation technology, and its main thought is: the channel of assignment is divided into many orthogonal sub-channels, carries out narrowband modulation and transmission on each subchannel, signal bandwidth is less than the correlation bandwidth of channel.
The introducing of OFDM technology has proposed new requirement to the resource allocation of network, promptly if obtain the good level of resources utilization, just must distribute new user radio resource to consider mutual interference problem between the neighbor cell of introducing thereupon when (frequency/time).
In the prior art, in order to reduce the mutual interference of minizone, promote the performance of Cell Edge User, cellular system has been extensive use of fixing/static frequency multiplex technique (as gsm system, its multiplexing coefficient is generally K=3,4,7,12 etc.), power control techniques (as cdma system) and DCA (dynamic channel allocation) technology that combines with the link detecting technology.Wherein, channeling is to instigate same frequency to cover different zones (zone that a part covered of a base station or this base station), these use the zone of same frequency to need at intervals (being called with the frequency multiplex distance) each other, to satisfy co-channel interference are suppressed in the index of permission.But also there is following shortcoming in these technology:
For fixing/static frequency multiplex technique, it can solve interference problem between the adjacent sub-district after at interval preferably in conjunction with frequency protection.But this kind static scheme is to implement static multiplex according to fixing multiplexing coefficient when network design/planning, and spectrum utilization efficiency is low, thereby has limited cell throughout and can support the further lifting of number of users.Is that loss with the sub-district overall throughput is a cost based on the interference mitigation technology of power control for the lifting of community marginal user performance, is unfavorable for comprehensive lifting of marginal user performance and cell throughout.The result who is based on link detecting based on the DCA technology of link detecting is by the DCA technology, and the user's of allotment link degradation air resource reaches the purpose of evading interference.This technology is posterior, is unfavorable for taking precautions against on one's own initiative when the Radio Resource original allocation or evading interference.
Summary of the invention
The purpose of this invention is to provide a kind of inter-cell interference coordination method based on the 3G system evolved network architecture, to overcome the shortcoming that the prior art spectrum utilization efficiency is low, be unfavorable for comprehensive lifting of marginal user performance and cell throughout, coordinate the mutual interference of minizone effectively, obtain wireless resource utility efficiency efficiently, further promote the throughput of sub-district and the service performance of Cell Edge User.
For this reason, the invention provides following technical scheme:
A kind of inter-cell interference coordination method based on the 3G system evolved network architecture, the described 3G system evolved network architecture comprises: a plurality of evolution base station E-Node B that chain of command server CPS and each CPS have under its command, store the wireless resource information that it has each sub-district under its command in CPS, described method comprises:
A, set the cell edge interference region of each sub-district;
B, as UE during not at described cell edge interference region, for the autonomous allocation radio resource of this UE and directly enable, demarcate the resource distribution result to affiliated CPS by E-Node B simultaneously;
C, when UE is positioned at described cell edge interference region, by E-Node B with affiliated CPS is collaborative is this UE allocation radio resource, and after the demarcation of receiving CPS is receiveed the response, enable the Radio Resource of configuration.
Described method further comprises:
The position of each UE in Serving cell in D, the real-time detected cells of E-Node B;
E, after detecting UE and entering described cell edge interference region, demarcate the resource parameters that this UE is using to affiliated CPS, and at the demarcation of the receiving CPS Radio Resource that the back determines that this UE should use of receiveing the response.
Described method further comprises:
E-Node B determines according to the measurement report of UE whether UE is positioned at the cell edge interference region of Serving cell.
Described step C comprises:
C1, E-Node B are the autonomous allocation radio resource of this UE and demarcate the resource distribution result to affiliated CPS;
C2, CPS carry out the interference coordination process according to its wireless resource information that has each sub-district under its command of storage, can not cause the Radio Resource that disturbs between neighbor cell for this UE is definite;
C3, receiveing the response by described demarcation sends the interference coordination result to E-Node B;
C4, E-Node B are this UE allocation radio resource according to the wireless resource information among the described interference coordination result and enable.
Described step e comprises:
E1, Node B demarcate the resource parameters that this UE is using to affiliated CPS;
E2, CPS carry out the interference coordination process according to its wireless resource information that has each sub-district under its command of storage, can not cause the Radio Resource that disturbs between neighbor cell for this UE is definite;
E3, receiveing the response by described demarcation sends the interference coordination result to E-Node B;
E4, E-Node B are this UE allocation radio resource according to the wireless resource information among the described interference coordination result and enable.
Described CPS carries out the interference coordination process according to its wireless resource information that has each sub-district under its command of storage and comprises:
The resource parameters of demarcating according to E-Node B judges whether to cause interference among adjacent cells;
If can not cause interference among adjacent cells, the Radio Resource that the resource parameters that then definite E-Node B demarcates should use for this UE;
If can cause interference among adjacent cells, then determine the Radio Resource that it should use for this UE again.
Receiveing the response by demarcation when sending the interference coordination result to E-Node B, if CPS determines the Radio Resource that resource parameters that E-Node B demarcates should use for this UE, allocated resource parameter not in described demarcation is receiveed the response then; Otherwise, in described demarcation is receiveed the response, specify new resource parameters.
When E-Node B specified new resource parameters, resource parameters were overlapped in assignment two to CPS in described demarcation is receiveed the response.
Described step C4 comprises:
Not during the allocated resource parameter, E-Node B is enabled as the Radio Resource of the autonomous configuration of this UE in described demarcation is receiveed the response;
When having specified resource parameters in described demarcation is receiveed the response, the resource parameters of E-Node B employing CPS appointment is this UE allocation radio resource and enables.
Described step e 4 comprises:
In described demarcation is receiveed the response not during the allocated resource parameter, the Radio Resource that keeps this UE using;
When having specified resource parameters in described demarcation is receiveed the response, the resource parameters of employing CPS appointment reconfigures Radio Resource for this UE and enables.
To different districts user distributing radio resource the time, make the outer user of cell edge interference region who is positioned at each sub-district use identical frequency resource.
By above technical scheme provided by the invention as can be seen, the present invention is based on the advantage of OFDM technology and the characteristics of the 3G system evolved network architecture, make the collaborative radio-resource-configuration of carrying out of E-Node B and CPS.When carrying out the sub band resources configuration, all available bandwidth resources are divided into two parts, part bandwidth resources adopt static multiplex mechanism, another part bandwidth resources adopt dynamic multiplexing mechanism, and make the interior user of center of housing estate scope use the bandwidth resources of static multiplex mechanism, directly dispose by E-Node B; And the user who falls into the cell edge interference region uses the bandwidth resources of dynamic multiplexing mechanism, be configured according to the local resource information synergism E-Node B that is grasped by CPS, and it is pre-configured and demarcate the mechanism that combines to adopt E-Node B to initiate resource, thereby has shortened resource settling time in the implementation process of interference coordination effectively.
In addition, the present invention also has the following advantages:
In the radio-resource-configuration process, introduce the semaphore interlocking mechanism, be used for the pre-demarcation of the resource of applying for, thereby avoided contingent collision in the resource bid process;
E-Node B carries the indication parameter that is clearly demodulated the sub-district of pilot tone by this UE during the UE Resources allocation in the cell edge interference region in the message that CPS application resource is demarcated, make CPS after carrying out resource distribution, carry out to extract rational resource distribution constrain set when the system interference increment is estimated, and then carry out interference coordination effectively, further promote the service efficiency of Radio Resource, improve the total throughout of sub-district;
Consult cell edge user's radio resource configuration parameter in the CPS border cell by the Icc interface between the CPS territory, implement the interference coordination strategy, not only avoided the mutual interference of possible minizone, and user's current resource is merged mutually with adjacent sub-district resource allocation, when UE moves to the Serving cell edge and triggers switching, can be reduced at the calculating process of Target cell resource allocation, help promoting switching efficiency, reduce the break period that handoff procedure causes, improve service performance the user.
The present invention also can be in conjunction with existing intelligent antenna technology, utilizes the sky branch characteristic of system to optimize cooperative scheduling algorithm between E-Node B and the CPS, further improves the frequency spectrum service efficiency; In conjunction with the pseudo-scrambler technology of base station, further optimize to disturb and suppress handling property.
Description of drawings
Fig. 1 is the E-UTRAN configuration diagram of 3G system evolved network;
Fig. 2 is a UE wireless resource multiplexing scene schematic diagram;
Fig. 3 is that the cell edge interference region is set schematic diagram;
Fig. 4 is the realization flow figure of the inventive method first embodiment;
To be that E-Node B and affiliated CPS are collaborative be the flow chart of UE allocation radio resource to Fig. 5;
Fig. 6 is the realization flow figure of the inventive method second embodiment;
Fig. 7 is a CPS territory border cell bunch schematic diagram.
Embodiment
Core of the present invention is the characteristics based on the advantage of OFDM technology and the 3G system evolved network architecture, makes the collaborative radio-resource-configuration of carrying out of E-Node B and CPS.When carrying out the sub band resources configuration, all available bandwidth resources are divided into two parts, part bandwidth resources adopt static multiplex mechanism, another part bandwidth resources adopt dynamic multiplexing mechanism, and make the interior user of center of housing estate scope use the bandwidth resources of static multiplex mechanism, directly dispose by E-Node B; And the user who falls into the cell edge interference region uses the bandwidth resources of dynamic multiplexing mechanism, is configured according to the local resource information synergism E-Node B that is grasped by CPS.In the radio-resource-configuration process, E-Node B determines the attributed region of UE in Serving cell according to the UE measurement report, and as UE during not at the cell edge interference region, E-Node B is independently for its resource allocation and directly enable; As UE during at the cell edge interference region, independently implement the resource distribution computing and demarcate the resource distribution result by E-Node B earlier to CPS for it, and then carry out interference coordination for it by CPS, for causing the UE that disturbs, meeting reconfigures rational frequency spectrum resource, thereby both made full use of limited frequency spectrum resources, avoided the mutual interference between Cell Edge User again.
The present technique field personnel know, in the cellular cell system based on OFDM physical layer modulation/demodulation technology, 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.Therefore, the frequency result of use of should frequency of utilization dynamic multiplexing technology approaching multiplexing coefficient 1, initiatively evade the formation of presence of intercell interference by the coordinated allocation of frequency spectrum between neighbor cell simultaneously, so that obtain higher cell throughout and good Cell Edge User service performance.
In the 3G system evolved network architecture, finish the layoutprocedure of Radio Resource by E-Node B and CPS cooperation.Because the CPS functional entity is grasped the radio-resource-configuration topological relation that has the sub-district under its command, thereby syntople and the frequency spectrum resource restricting relation of CPS between can clear and definite each sub-district, help in the CPS territory, realizing the dynamic dispatching of on-air radio resource in frequency/time 2-D territory.
For this reason, the present invention is based on the 3G system evolved network architecture, take into full account the interference characteristic of OFDM technology cellular cell, for in the sub-district near the UE of base station distributing radio resource (frequency reuse is 1) in full range/time domain space, and the user's radio resource near cell edge is distributed, then consider the neighbor cell influence and the restriction of resource allocation, make the condition that is assigned as of its frequency spectrum limited (be frequency reuse greater than 1, and change with resource dynamic with neighbor cell).
Concrete reference UE wireless resource multiplexing scene shown in Figure 2 further specifies:
Be in three UE in the sub-district 1 (identify with round dot, squares and triangles respectively in the drawings, and called after UEa, UEb and UEc) successively and, should adopt different dynamic multiplexing coefficients because residing interference environment is different:
For UEa because it is in the sub-district 1 comparatively the zone near the base station, so its adjacent area interference that is subjected to a little less than, can the traffic affecting normal operation, so can in full range/time domain space, be its distributing radio resource;
For UEb, it is in the junction of sub-district 1 and 3, promptly is in the edge of sub-district 1, this moment is during distributing radio resource, not only to follow the configuration guidelines in the sub-district 1, should take into account the possibility that sub-district 3 applies interference simultaneously, must when allocation radio resource, evade the resource that has disposed in the sub-district 3;
For UEc, because its residing position is more special, during allocation radio resource, should follow the configuration guidelines in the sub-district 1, evade the resource that has disposed in sub-district 3 and 2 again.
During concrete engineering is used,, can define edge ring territory (EdgeRing) at the edge of sub-district based on the planning of sub-district in order to quicken resource allocation process, in order to describe the zone that needs to consider minizone mutual interference effect, as shown in Figure 3:
EdgeRing among the figure is the distribution under the ideal scenario, can determine concrete decision threshold according to the measurement result that UE reports in concrete application.Therefore, final EdgeRing zone is approximate belt zone.When UE falls into the EdgeRing zone its status indication EDGERING being set is 1; The time its status indication EDGERING to be set be 0 and UE does not fall into the EdgeRing zone.
Suppose system can with total bandwidth be Ω, it is divided into two parts: A and B.Fall into user's utilized bandwidth resource B in EdgeRing zone in certain sub-district, and the extra-regional user's utilized bandwidth of EdgeRing resource A.The user of utilized bandwidth resource A wherein is 1 based on the multiplexing coefficient of its bandwidth resources of characteristics of OFDM technology, can directly be disposed by E-Node B in the resource distribution process, needn't consider the interference (for static multiplex mechanism) of adjacent sub-district; And the user of utilized bandwidth resource B, owing to be in the EdgeRing zone, must consider the interference problem of adjacent sub-district, implement dynamic-configuration (for dynamic multiplexing mechanism) based on the local resource information that CPS grasped by E-Node B and CPS cooperation in the user resources layoutprocedure.That is to say that resource distribution process of the present invention has organically combined the dynamic and static multiplex mechanism of resource.
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. 4, Fig. 4 is the realization flow of the inventive method first embodiment, may further comprise the steps:
Step 401: the cell edge interference region of setting each sub-district.
The front is described in detail, can determine the decision threshold of cell edge interference region in concrete application according to the measurement result that UE reports.In the measurement result that UE reports, comprise information such as the indication information of adjacent cell of Serving cell pilot frequency intensity, clear and definite demodulation and corresponding pilot frequency intensity.
Step 402:, determine the position of this UE in Serving cell by E-Node B when needs during for UE original allocation Radio Resource.
E-Node B can determine the attributed region of UE in Serving cell according to the measurement result that UE reports.
Step 403: judge that whether UE is at the cell edge interference region.
If UE then enters step 404 not at the cell edge interference region: also directly enable for the autonomous allocation radio resource of this UE by E-Node B, demarcate the resource distribution result to affiliated CPS simultaneously.
Otherwise enter step 405: being worked in coordination with by E-Node B and affiliated CPS is this UE allocation radio resource, and enables the Radio Resource of configuration after the demarcation of receiving CPS is receiveed the response.
The front is by the agency of, in the 3G of evolution system, comprises functional entity CPS, realizes many cell managements function, grasps the resource allocation information and the relation of the topological structure between each sub-district of sub-district under the CPS territory.CPS by with E-Node B between interface dynamically receive the relevant process of idle wireless resource, comprising the result of processes such as resource allocation/reprovision, resource reservation and resource release, is that unit sets up the Radio Resource upstate that has each sub-district under its command and handles the load topology information with the sub-district.
Carry out in the message of resource demarcation to CPS at E-Node B, not only contain the autonomous distributing radio resource result of E-Node B, UE in Serving cell residing position mark (such as, desired location flag parameters EDGERING, EDGERING represented that UE was in the cell edge interference region at 1 o'clock, EDGERING is that to represent that UE was in the cell edge interference region at 0 o'clock outer), but also the relevant indication information of this adjacent cells of cells that UE clearly can be demodulated pilot tone sends CPS to by this message, make CPS set up the constrain set that reasonable frequency is distributed, also help alleviating the processing load of CPS simultaneously according to these information.
CPS can set up the local resource topology diagram according to the resource allocation information of each sub-district of oneself grasping, and according to the frequency subband application in the E-Node B Radio Resource demarcation message, mark in addition in this topology diagram can be judged if whether the frequency subband that UE uses E-Node B to demarcate can cause disturbing between neighbor cell fast according to this topology diagram.
Above-mentioned E-Node B and affiliated CPS collaborative for the detailed process of UE allocation radio resource as shown in Figure 5, may further comprise the steps:
Step 501:E-Node B is the autonomous allocation radio resource of UE and demarcates the resource distribution result to affiliated CPS.
Step 502:CPS carries out the interference coordination process according to its wireless resource information that has each sub-district under its command of storage, can not cause the Radio Resource that disturbs between neighbor cell for this UE is definite.
CPS knows promptly according to the UE position mark parameter that E-Node B resource is demarcated in the message whether UE is positioned at the cell edge interference region, if UE is not in the cell edge interference region, then CPS does not intervene the resource allocation of UE, that is to say, allow E-Node B independently to carry out resource distribution for UE; And when in the cell edge interference region, then implement to intervene, analyze E-Node B resource and demarcate the frequency subband application in the message and demarcate relevant adjacent sub-district indication in the message and the information in the local resource topology diagram, judge the independent radio resource of E-Node B distributes whether can cause interference among adjacent cells in conjunction with E-Node B resource.If confirm can not introduce interference, then confirm to demarcate and replied to E-Node B; And if think initiation disturbed, then CPS is according to cell topology and the respective resources occupied information self grasped, by distributing the allocation result that the algorithm acquisition can be evaded interference rationally, and the revision initial alignment is corresponding C PS allocation result, subsequently the radio resource configuration parameters after the specified modification in the demarcation of E-Node B is replied.
Step 503: receiveing the response by demarcation sends the interference coordination result to E-Node B.
Receiveing the response by demarcation when sending the interference coordination result to E-Node B, can adopt following manner to show the coordination result of CPS:
If CPS determines the Radio Resource that resource parameters that E-Node B demarcates should use for this UE, allocated resource parameter not in described demarcation is receiveed the response then; Otherwise, in described demarcation is receiveed the response, specify new resource parameters.
Certainly, in actual applications, also can adopt different message formats, such as, if CPS determines the Radio Resource that the resource parameters of E-Node B demarcation should use for this UE, can directly send ACK (affirmation) message to E-NodeB; Otherwise send NACK (not confirming) message to E-Node B, in NACK message, comprise the resource parameters of CPS appointment.
Step 504:E-Node B is this UE allocation radio resource according to the wireless resource information among the interference coordination result and enables.
Not during the allocated resource parameter, E-Node B is enabled as the Radio Resource of the autonomous configuration of this UE in demarcation is receiveed the response; When having specified resource parameters in demarcation is receiveed the response, the resource parameters of E-Node B employing CPS appointment is this UE allocation radio resource and enables.
Step 505:E-Node B responds resource to CPS and loads success message after the resource distribution success, and indication CPS finishes this calibration process.
Utilize the present invention, can be when carrying out the resource initial configuration for UE, associated treatment by CPS, make E-Node B finish resource distribution process to UE, and avoided the interference of adjacent minizone, can make simultaneously the user who is positioned at outside the cell edge interference region use identical subband, save frequency resource.Node B carries out the rapidity demand that pre-configured mechanism helps satisfying service surface foundation among the present invention.
The present technique field personnel know, the mobility of UE makes UE residing position in the sub-district to change, producing the adjacent area when UE moves in the cell edge interference region of Serving cell disturbs, E-Node B can detect in real time to the UE of distributing radio resource, detect the position of each UE in Serving cell, after detecting UE and entering the cell edge interference region, demarcate the resource parameters that this UE is using to affiliated CPS, by demarcation information and the local resource topology diagram of CPS, judge whether the subband that this UE uses can produce the adjacent area interference according to E-Node B.If confirm can not produce interference, then confirm to demarcate and replied to E-Node B; And if think initiation disturbed, then CPS is according to cell topology and the respective resources occupied information self grasped, by distributing the allocation result that the algorithm acquisition can be evaded interference rationally, and respond and give E-Node B, E-Node B determines the Radio Resource that this UE should use after receiveing the response according to the demarcation of CPS.
With reference to Fig. 6, Fig. 6 shows the realization flow of the inventive method second embodiment, may further comprise the steps:
Step 601:UE measurement result reports, and comprises parameter in this measurement report: the indication information of the adjacent sub-district of Serving cell pilot frequency intensity and clear and definite demodulation and corresponding pilot frequency intensity;
Step 602:E-Node B judges whether needs resource initial configuration of UE according to the measurement report of UE;
If desired, then enter step 603:E-Node B and determine the attributed region of UE in Serving cell, that is to say, judge that UE is whether in predefined cell edge interference region EdgeRing territory according to the UE measurement report; Otherwise enter step 606;
If not in the EdgeRing territory, then enter step 604:E-Node B and independently also directly enable for this UE resource allocation; Otherwise, enter step 607;
Step 605:E-Node B demarcates the resource of autonomous configuration to CPS, and carries indication parameter: EDGERING=0 in this demarcation message; Then, finish this resource distribution process.
Step 606: judge whether UE moves in the EdgeRing territory;
If UE does not move in the EdgeRing territory, then directly finish; Otherwise, enter step 608;
Step 607:E-Node B independently implements resource distribution, for UE allocates Radio Resource in advance;
Step 608:E-Node B demarcates the resource distribution result to CPS, if the UE of Resources allocation, then demarcate the Radio Resource that this UE is using to CPS, in this demarcation message, carry the indication information of the adjacent sub-district of parameter: EDGERING=1 and the clear and definite demodulation of this user, be used for CPS and form resource distribution constrain set;
Step 609:CPS carries out judgement based on interference coordination according to the demarcation information received, is judged as Radio Resource that pre-configured Radio Resource of UE or UE using and whether can causes the adjacent area and disturb;
If can cause interference, then enter step 610:CPS and implement the interference coordination process, be this UE configuration reasonable resource parameter; Otherwise, enter step 613;
Step 611:CPS does to demarcate to E-Node B and responds, and carries the resource parameters of CPS appointment in this demarcation is receiveed the response;
Step 612:E-Node B adopts the configuration of CPS designated parameters and enables, and enables success message to the CPS response; Then, finish this resource distribution process.
Step 613:CPS does to E-Node B and demarcate to respond, CPS allocated resource parameter not in this demarcation is receiveed the response;
Step 614:E-Node B is that UE enables Radio Resource according to the parameter of autonomous configuration, if this UE is not the resource initial configuration, then keeps the resource parameters of UE constant, and enables success message to the CPS response; Then, finish this resource distribution process.
CPS can assignment two overlap resource parameters when E-Node B allocated resource configuration parameter in above-mentioned steps 611, and wherein a cover is as standby parameter, and corresponding resource calibration process also should be optimized thereupon accordingly.
In the network planning, with a CPS have under its command be in the cell topology edge and with the set of the sub-district of other CPS territory adjacency as CPS territory border cell bunch, its typical form is (topological graph of CPS has various variations in the actual scene, and the CPS border cell bunch not necessarily forms closed loop) as shown in Figure 7.These sub-districts are determined when network design and planning, and are known by CPS.
Identical for intra-cell resource layoutprocedure in the inner non-border cell in CPS territory bunch with basic mode described above.And, then should consider the mutual interference problem between the different CPS border cells for the processing that intra-cell resource in the inner boundary cell cluster of CPS territory disposes.Concrete processing is as follows:
CPS analyze E-Node B resource demarcate UE report in the message by the indication information of the sub-district of clear and definite demodulation, if do not comprise sub-district outside this CPS territory in this indication information, then the layoutprocedure of its respective resources is identical with above-mentioned basic mode; And if indicated sub-district outside this CPS territory in the demarcation information, service CPS must consult rational resource distribution parameter by the interface Icc between the CPS with the associated CPS that cooperates in the outer sub-district of self zone, evades the mutual interference of minizone so that implement the interference coordination strategy.The collision scene of possible resource bid in the negotiations process, to adopt equally resource in advance the mechanism of demarcating come the implementation process protection.
The present invention can also in the resource distribution process, further utilize the sky branch characteristic of system in conjunction with existing intelligent antenna technology when practical application, optimize the cooperative scheduling between E-Node B and the CPS, obtains the frequency spectrum service efficiency of further optimizing; But also can on the performance of disturbing inhibition to handle, obtain more optimization effect in conjunction with the pseudo-scrambler technology of base station.In addition, can also pass through the handoff threshold of reasonable related EdgeRing territory thresholding and minizone, can be directly available in Target cell so that switch user's resource distribution parameter, thus quicken and optimization switching controls process.
The present invention makes the resource distribution strategy of dynamic multiplexing and effective resource consolidation strategy combine in the resource distribution process, can improve the service efficiency of resource greatly.
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 (11)
1, a kind of inter-cell interference coordination method based on the 3G system evolved network architecture, the described 3G system evolved network architecture comprises: a plurality of evolution base station E-Node B that chain of command server CPS and each CPS have under its command, in CPS, store the wireless resource information that it has each sub-district under its command, it is characterized in that described method comprises:
A, set the cell edge interference region of each sub-district;
B, as UE during not at described cell edge interference region, for the autonomous allocation radio resource of this UE and directly enable, demarcate the resource distribution result to affiliated CPS by E-Node B simultaneously;
C, when UE is positioned at described cell edge interference region, by E-Node B with affiliated CPS is collaborative is this UE allocation radio resource, and after the demarcation of receiving CPS is receiveed the response, enable the Radio Resource of configuration.
2, method according to claim 1 is characterized in that, described method further comprises:
The position of each UE in Serving cell in D, the real-time detected cells of E-Node B;
E, after detecting UE and entering described cell edge interference region, demarcate the resource parameters that this UE is using to affiliated CPS, and at the demarcation of the receiving CPS Radio Resource that the back determines that this UE should use of receiveing the response.
3, method according to claim 1 and 2 is characterized in that, described method further comprises:
E-Node B determines according to the measurement report of UE whether UE is positioned at the cell edge interference region of Serving cell.
4, method according to claim 1 is characterized in that, described step C comprises:
C1, E-Node B are the autonomous allocation radio resource of this UE and demarcate the resource distribution result to affiliated CPS;
C2, CPS carry out the interference coordination process according to its wireless resource information that has each sub-district under its command of storage, can not cause the Radio Resource that disturbs between neighbor cell for this UE is definite;
C3, receiveing the response by described demarcation sends the interference coordination result to E-Node B;
C4, E-Node B are this UE allocation radio resource according to the wireless resource information among the described interference coordination result and enable.
5, method according to claim 2 is characterized in that, described step e comprises:
E1, NodeB demarcate the resource parameters that this UE is using to affiliated CPS;
E2, CPS carry out the interference coordination process according to its wireless resource information that has each sub-district under its command of storage, can not cause the Radio Resource that disturbs between neighbor cell for this UE is definite;
E3, receiveing the response by described demarcation sends the interference coordination result to E-Node B;
E4, E-Node B are this UE allocation radio resource according to the wireless resource information among the described interference coordination result and enable.
According to claim 4 or 5 described methods, it is characterized in that 6, described CPS carries out the interference coordination process according to its wireless resource information that has each sub-district under its command of storage and comprises:
The resource parameters of demarcating according to E-Node B judges whether to cause interference among adjacent cells;
If can not cause interference among adjacent cells, the Radio Resource that the resource parameters that then definite E-Node B demarcates should use for this UE;
If can cause interference among adjacent cells, then determine the Radio Resource that it should use for this UE again.
7, method according to claim 6 is characterized in that,
Receiveing the response by demarcation when sending the interference coordination result to E-Node B, if CPS determines the Radio Resource that resource parameters that E-Node B demarcates should use for this UE, allocated resource parameter not in described demarcation is receiveed the response then; Otherwise, in described demarcation is receiveed the response, specify new resource parameters.
8, method according to claim 7 is characterized in that, when E-Node B specified new resource parameters, resource parameters were overlapped in assignment two to CPS in described demarcation is receiveed the response.
9, method according to claim 4 is characterized in that, described step C4 comprises:
Not during the allocated resource parameter, E-Node B is enabled as the Radio Resource of the autonomous configuration of this UE in described demarcation is receiveed the response;
When having specified resource parameters in described demarcation is receiveed the response, the resource parameters of E-Node B employing CPS appointment is this UE allocation radio resource and enables.
10, method according to claim 5 is characterized in that, described step e 4 comprises:
In described demarcation is receiveed the response not during the allocated resource parameter, the Radio Resource that keeps this UE using;
When having specified resource parameters in described demarcation is receiveed the response, the resource parameters of employing CPS appointment reconfigures Radio Resource for this UE and enables.
11, method according to claim 1 is characterized in that, to different districts user distributing radio resource the time, makes the outer user of cell edge interference region who is positioned at each sub-district use identical frequency resource.
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