CN102131200A - Network system for coordinating interference of household base station and interference coordination method thereof - Google Patents
Network system for coordinating interference of household base station and interference coordination method thereof Download PDFInfo
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Abstract
The invention discloses a network system for coordinating the interference of a household base station and an interference coordination method thereof. The improvement of the system is characterized in that an air interface additionally arranged between the household base station and a macro base station of a home network is used for supporting the bidirectional signaling interaction of the household base station, so that wireless resources used by each household base station within the coverage range of the macro base station can be conveniently distributed and managed by the macro base station; interference coordination is favorable to carry out for cross-layer interference between the macro base station and the household base station as well as same-layer interference between adjacent household base stations belonging to the same macro base station, so that the interference level of a network is lowered, the communication quality and the service satisfaction rate of the user can be improved, the space utilization rate of cell resources can be improved, and cell service capacity is improved; and the authentication, the service level and the wireless resource of the household base station are managed by the macro base station.
Description
Technical field
The present invention relates to a kind of network system and disturbance coordination method thereof that family base station interference is coordinated that be used for, belong to the technical field of wireless network networking.
Background technology
Along with the development of mobile Internet business, increasing customer service betides indoor environment, comprises the interior place of dwelling house, office building and other common chamber etc.In order to solve the network coverage under the indoor environment and the problem of power system capacity, family base station is becoming and is having a great attraction and the networking plan of application potential.At present, abroad, comprise that the Sprint of the U.S. and the operation commercial city of Vodafone in Europe have begun to provide family BTS service to the user.What can estimate is that in the mobile communications network in future, bigger effect will be brought into play in family base station.
Family base station is a kind of low-power of the frequency spectrum resource identical with macro base station, small base station cheaply of using, being mainly used in provides indoor enhancement mode to cover, and by existing cable broadband access-in resource (such as the core net of connection mobile operator asynchronous digital subscriber line ADSL).Since family base station normally by the user buy voluntarily, installation and maintenance, therefore, can save the network operation maintenance cost of operator; Simultaneously, family base station can be shunted the service traffics of macro base station, thereby has further reduced the investment of operator aspect the network capacity extension.From user perspective, mobile network's indoor covering can be improved in family base station, improves the service quality of high-speed data service, and reduces the power consumption of user terminal and the stand-by time that prolongs handheld terminal.Therefore, family base station is the selection of doulbe-sides' victory for Virtual network operator and user, can predict, and it will become a kind of networking technology that has very much application prospect.
For family base station, interference coordination between itself and the macro base station and the interference coordination between the different home formula base station are unusual important problem, will directly influence the effect and the overall performance of network of family base station.The frequency spectrum that uses because of family base station is identical with macro base station, and the same layer of striding between layer interference and the adjacent family base station that forms between family base station and the macro base station is disturbed.Particularly when closed user group CSG (closed subscriber group) access module is adopted in family base station, only just allow to insert this family base station, and other nonregistered users that are in family base station range can only be linked into macro base station the user of family base station login.At this moment, bigger interference all can be caused to the descending of macro base station user and macro base station user to the up of family base station in family base station, has a strong impact on the user's communications quality.
Existing interference coordination schemes at family base station mainly comprises following two kinds of methods:
(1) is the Radio Resource of macro base station and family base station configuration quadrature, and the configuration of resource is semi-static, can't adapt to the variation of quantity, position and the operating state thereof (On/Off) of family base station, can't adapt to the variation of the customer service under the family base station, cause the wireless resource utility efficiency of network lower, the configuration management complexity of Radio Resource, and can't be soon at the change of family base station and customer service thereof and adjust in real time.
(2) macro base station and family base station are monitored its residing wireless environment in real time, when finding to have larger interference on some Radio Resource, initiatively take to disturb workaround respectively.Because quantity, position and operating state thereof, wireless channel, user mobility and the customer service of family base station all are in dynamic change, this method is difficult to obtain at short notice the Resource Allocation Formula of restraining, cause the instability of customer service quality and uncertain, and algorithm itself is comparatively complicated, especially can't guarantee convergence between the algorithm of different vendor.
In macrocell, various Radio Resources are distributed unitedly and are managed by macro base station, can guarantee for different users distributes mutually orthogonal Radio Resource, avoid being linked into producing between the different user of same macro base station and disturb.Yet, owing in the existing network configuration, do not have interface between family base station and the macro base station, so macro base station can't be known the Radio Resource behaviour in service of family base station accurately and timely, cause both may use identical Radio Resource, thereby bring the serious layer of striding to disturb.Same, for want of unified interference management mechanism can only dynamically be adjusted its Radio Resource and be evaded air interference by independent measurement separately between the different family base stations, also can cause the unsteadiness and the uncertainty of user channel quality.Therefore, provide a kind of network system architecture and interface efficient, that reliably the interference of family base station is managed and coordinates, become the new problem that scientific and technical personnel in the industry are badly in need of solving.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of network system and disturbance coordination method thereof that family base station interference is coordinated that be used for, be different from traditional-family's formula base station networking scheme, system of the present invention sets up air interface and realizes Signalling exchange between family base station and macro base station, family base station can report the user demand of Radio Resource the base station that it belongs to, and determines this spendable Radio Resource in family base station by macro base station according to customer service demand and disturbance regime again.And coordinate scheme efficient, that elimination is reliably disturbed is provided on this basis, guarantee that the service quality of customer service is stable, and improve the utilance of network radio resources.The present invention need not user terminal is carried out any modification.
In order to reach the foregoing invention purpose, the invention provides a kind of network system that family base station interference is coordinated that is used for, it is characterized in that: between family base station and macro base station, set up air interface, be used to support its two-way Signalling exchange:
On the up direction of this air interface, family base station reports the various information that comprise business load demand, QoS demand and disturbance state of this family base station institute coverage cell to macro base station, for macro base station according to its reporting message, and, be its required Radio Resource of family base station assigns in conjunction with the authentication and the CAMEL-Subscription-Information of the behaviour in service of macro base station own resource, business load, each family base station;
On the down direction of this air interface, macro base station makes family base station can use this assigned radio resource to provide service for its active user its family base station of wireless resource allocation result notification; Simultaneously, during this period, macro base station does not re-use same asset, avoids producing between the two and strides layer interference, improves user communication quality;
When the customer service of family base station finish and by up air interface notice macro base station after, macro base station is just with the former Radio Resource recovery of distributing to family base station, is used for other the family base stations in self or the institute overlay area.
In order to reach the foregoing invention purpose, the method that the present invention also provides a kind of elimination that is used for the network system of family base station interference coordination to disturb, it is characterized in that: family base station receives service request from user, and when existing Radio Resource can't satisfy this professional QoS requirement, initiate the request of Radio Resource register update to the macro base station of its ownership; Whether macro base station allows the Radio Resource register update according to the authentication information of family base station, signatory grade and network condition decision; If the permission register update, then the Radio Resource that this family base station can be used will be determined and inform to macro base station; Before customer service finished, macro base station did not re-use any by the Radio Resource of family base station login, avoided producing mutual interference mutually with family base station; And the term of execution of customer service, macro base station can be adjusted the Radio Resource that use family base station; After customer service finished, the request of Radio Resource register update was initiated once more to macro base station in family base station, and macro base station reclaims the Radio Resource of the original registration in family base station, again the Radio Resource that reclaims was offered other family base station or himself reused.
Technological innovation characteristics of the present invention and beneficial effect are:
(1) by between family base station and macro base station, increasing air interface, make family base station the user demand of its Radio Resource can be reported macro base station, macro base station can carry out unified management and coordination to the Radio Resource that use each the family base station in the overlay area, can avoid between macro base station and the family base station efficiently, reliably and the interference between the adjacent family base station, improve user communication quality.
(2) the present invention aloft interface increased macro base station for the authentication functions of family base station and the signatory grade attribute of family base station, the former can avoid the business of the family base station interference macro base station of illegal family base station or other operators; It is the different resource of different home formula base station assigns that the latter is used for according to the signatory grade of user, helps the differentiation market operation.
(3) the present invention is transparent to existing terminal, need not terminal is made any change and changes, as long as upgraded in family base station and macro base station, is easy to be accepted by the user and expands the scope of application.
(4) the invention enables the RRM of family base station to become the organic composition of the whole RRM of network, can carry out unified management and control, be convenient to form Radio Resource holistic management scheme, promote whole network quality coordinated development by macro base station.Because of macro base station is the overall Radio Resource that the family base station of unified management can be used, the allocation of radio resources of each family inside of base station different user is still to be managed respectively by each family base station, forms two-layer resource management architectures, simple and clear.
(5) the inventive method had both been avoided in the traditional coordinating semi-static interference algorithm, and family base station will take Radio Resource at the non-active period of business, has improved utilization ratio of wireless resources, has promoted the network system capacity; Also avoid the non-convergency of the network parameter that the various dynamic factors in the traditional distributed interference coordination algorithm cause, improved the customer service quality of stability.
Description of drawings
Fig. 1 is the interference schematic diagram of family base station network system.
Fig. 2 (A), (B) are respectively the schematic diagrames of the network architecture composition that existing family base station network system configuration is formed and the family base station interference of the present invention is coordinated.
Fig. 3 is the network system disturbance coordination method operational flowchart that the family base station interference of the present invention is coordinated.
Fig. 4 selects schematic diagram for two kinds of mode of operations of network system disturbance coordination method of the present invention.
Fig. 5 (A), (B), (C), (D) are respectively the allocation of radio resources schematic diagrames in the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and Examples.
Referring to Fig. 1, introduce the disturbed condition of the family base station network of the present invention system.User 1,2,3 among the figure inserts family base station 1,2,3 respectively, and user 4 inserts macro base station.Because macro base station uses identical frequency range with family base station, following two kinds of interference will occur:
The layer of striding between macro base station and the family base station disturbs: for example as shown in arrow 1, the downstream signal of family base station 1 will disturb the user's 4 of contiguous access macro base station downstream signal.Equally, as shown in arrow 2, user 4 upward signal will disturb family base station 1 to receive its user's who serves 1 upward signal.
Same layer between the contiguous family base station disturbs: for example as shown in arrow 3, the downstream signal of family base station 2 receives interference user 3 downstream signal of family base station 3.Equally, as shown in arrow 4, user 3 upward signal will disturb family base station 2 to receive the user's 2 who is served upward signal.
Disturb and disturb with layer for fear of the above-mentioned layer of striding, present main solution is: the Radio Resource that 1) disposes quadrature for macro base station and family base station semi-staticly; 2) macro base station and family base station are monitored its residing wireless environment in real time, when finding to have larger interference on some Radio Resource, initiatively take to disturb workaround.Yet as previously mentioned, all there is limitation and not enough in these two kinds of schemes, so will improve it.
Referring to Fig. 2, the working condition of existing family base station network system in elder generation key diagram (A): the interface between user terminal and macro base station or the family base station is the air interface of standard code, and macro base station directly connects mobile core network by the Iu interface of stipulating in the standard.Family base station then is connected to the security gateway that safe access function is provided in the family BTS service platform based on Internet.Family base-station gateway is responsible for signaling between family base station and the core net and data are converged and transmit between security gateway and mobile core network.Can see, in the existing system, there is not direct communication interface between family base station and the macro base station, thereby can't between wireless resource allocation be used and coordinate, family base station works in " uncontrolled " state, is easy to produce between family base station and macro base station disturb.
Introduce the network system of the improved family base station of the present invention among the figure (B) again: between family base station and macro base station, set up air interface, be used to support its two-way Signalling exchange.Wherein:
On the up direction of this air interface, family base station comprises the business load demand to what macro base station reported this family base station institute coverage cell, the various information of QoS demand and disturbance state, for macro base station according to its reporting message, grasp the family service in base station load of institute overlay area in real time, Radio Resource, situations such as interference level, and in conjunction with the behaviour in service of macro base station own resource, business load, the authentication of each family base station and CAMEL-Subscription-Information, for its required Radio Resource of family base station assigns and dynamically adjust, the unified management of realization to disturbing, the interference level of reduction network;
On the down direction of this air interface, macro base station makes family base station can use this assigned radio resource to provide service for its active user its family base station of wireless resource allocation result notification; Simultaneously, during this period, macro base station does not re-use same asset, avoids producing between the two and strides layer interference, improves user communication quality;
When the customer service of family base station finish and by up air interface notice macro base station after, macro base station is just with the former Radio Resource recovery of distributing to family base station, is used for other the family base stations in self or the institute overlay area.Like this, family base station works in " controlled " state.The change that it should be noted that network system of the present invention is transparent for user terminal, thereby need not upgrade to user terminal.
The method that the present invention is used for the interference coordination of the network system that family base station interference coordinates is: family base station receives service request from user, and when existing Radio Resource can't satisfy this professional QoS requirement, initiate the request of Radio Resource register update to the macro base station of its ownership; Whether macro base station allows the Radio Resource register update according to the authentication information of family base station, signatory grade and network condition decision; If the permission register update, then the Radio Resource that this family base station can be used will be determined and inform to macro base station; Before customer service finished, macro base station did not re-use any by the Radio Resource of family base station login, avoided producing mutual interference mutually with family base station; And the term of execution of customer service, macro base station can be adjusted the Radio Resource that use family base station; After customer service finished, the request of Radio Resource register update was initiated once more to macro base station in family base station, and macro base station reclaims the Radio Resource of the original registration in family base station, again the Radio Resource that reclaims was offered other family base station or himself reused.
Referring to Fig. 3, introduce each operating procedure of the inventive method:
(1) user who inserts family base station initiates new service request to family base station.
(2) family base station judges according to this service attribute and parameter whether the Radio Resource that has obtained to register can satisfy this professional QoS requirement; If can, then need not to upgrade its Radio Resource, finish this flow process; Otherwise, initiate the request of Radio Resource register update to the macro base station of its ownership by air interface.
Be the access delay of the real time business that reduces family base station, macro base station of the present invention is each family base station reserved part Radio Resource, and the starting stage that offers its real time business and non-real-time service uses; Like this, when family base station user initiates real time business, need not to the extra Radio Resource of macro base station application because of it has distributed acquisition part resource, thereby reduce professional access delay.
(3) macro base station carries out authentication to family base station, if by authentication, then carry out subsequent step (4); Otherwise, return the refuse information of Radio Resource register update, indicate Reason For Denial, make family base station can't obtain usable radio resources, can't provide professional for inserting the user.
(4) macro base station judges whether the Radio Resource that family base station has obtained to register has surpassed signatory grade.If do not surpass, then carry out subsequent step (5); Otherwise, return the refuse information of Radio Resource register update, indicate Reason For Denial, make family base station can only use original Radio Resource to provide professional as the user.
(5) macro base station judges whether this sub-district remains Radio Resource in addition and can provide family base station login to use, if remain Radio Resource in addition, then carries out subsequent step (6); Otherwise, return the refuse information of Radio Resource register update, indicate Reason For Denial, make family base station can only use original Radio Resource to provide professional as the user.
Need to prove especially: the time sequential routine of above-mentioned three steps (3), (4) and (5) does not have strict the qualification, can according to circumstances adjust accordingly.
(6) macro base station is the new available radio resources of family base station assigns, and notifies family base station by air interface;
(7) family base station adds newly assigned Radio Resource on original registered Radio Resource basis, its all Radio Resources is redistributed, and used the Radio Resource of redistributing to provide professional as the user;
(8) after customer service finished, the request of Radio Resource register update was initiated to macro base station in family base station: require the professional pairing Radio Resource cancel register to having finished;
(9) macro base station Radio Resource that family base station was registered just now reclaims, and reuses for other family base station or macro base station self.
Referring to Fig. 4, in order to enlarge the mobile service coverage or to mend purposes such as blind, when family base station is used in the zone that some macro base station can't cover, after family base station powers up startup, should at first scan the frequency range that is disposed, if find to be in the macro base station coverage, just enter Radio Resource " controlled " pattern by the macro base station unified management, promptly order is held above-mentioned steps (1)～(9); Be not in the macro base station coverage if find, then change special " uncontrolled " pattern over to: thus the time do not exist the layer of striding between family base station and the macro base station to disturb, as long as the same layer of evading between the adjacent family base station that may exist disturbs, promptly the allocation of radio resources of this family base station will be monitored in real time dynamically and adjust accordingly based on self.
The present invention has carried out repeatedly implementing test, specifies each operating procedure of the inventive method referring to embodiment shown in Figure 5.Suppose that user 2 and user 4 insert family base station 2 and macro base station respectively, and get the Radio Resource (shown in Fig. 5 (A)) of quadrature.At this moment, user 3 prepares to initiate professional.
(1) user 3 initiates service request to family base station 3;
(2) family base station 3 judges according to user 3 service attribute and parameter whether the Radio Resource that has obtained to register can satisfy the QoS requirement of user 3 business.Do not come to provide professional because of family base station 3 obtains enough Radio Resources as yet, thereby need to initiate the request of Radio Resource register update to user 3;
(3) request of Radio Resource register update is initiated to macro base station in family base station 3;
(4) macro base station judges earlier whether family base station 3 is legal.Family base station 3 in the present embodiment is legal, so continue to carry out following steps;
(5) macro base station judges whether the Radio Resource that family base station 3 has obtained to register has surpassed signatory grade.Supposition does not surpass its signatory grade in the present embodiment, so continue following steps;
(6) macro base station judges whether this sub-district remains Radio Resource in addition and can use for 3 registrations of family base station.Supposition also has surplus resources in the present embodiment, so continue following steps;
(7) macro base station is that new usable radio resources is distributed in family base station 3.Because family base station 3 and family base station 2 close together, for avoiding the interference between the two, macro base station is the Radio Resource of 3 distribution of family base station and family base station 2 quadratures.The method that how to obtain the interference relationships between the family base station and carry out resource allocation because of macro base station belongs to prior art, repeats no more herein.Then, macro base station is with the family base station 3 of the result notification of resource allocation (shown in Fig. 5 (B));
(8) family base station 3 uses the Radio Resource that obtains to provide professional as user 3;
(9) user 1 initiates service request to family base station 1, and its content of operation is similar to step (2)～(7), is family base station 1 distributing radio resource by macro base station.Because family base station 1 is far away with family base station 3 distances, can reuse identical Radio Resource, to improve resource utilization ratio.Macro base station is with the family base station 1 of the result notification of resource allocation (shown in Fig. 5 (C));
(10) three users' 1,2,3 service ending, each family base station are initiated the request of Radio Resource register update to macro base station respectively, to the professional pairing Radio Resource cancel register that has finished;
(11) macro base station reclaims the Radio Resource of the original registration in family base station, and the Radio Resource of recovery can reuse (shown in Fig. 5 (D)) for other family base station or this macro base station.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (6)
1. one kind is used for the network system that family base station interference is coordinated, and it is characterized in that: set up air interface between family base station and macro base station, be used to support its two-way Signalling exchange:
On the up direction of this air interface, family base station reports the various information that comprise business load demand, QoS demand and disturbance state of this family base station institute coverage cell to macro base station, for macro base station according to its reporting message, and, be its required Radio Resource of family base station assigns in conjunction with the authentication and the CAMEL-Subscription-Information of the behaviour in service of macro base station own resource, business load, each family base station;
On the down direction of this air interface, macro base station makes family base station can use this assigned radio resource to provide service for its active user its family base station of wireless resource allocation result notification; Simultaneously, during this period, macro base station does not re-use same asset, avoids producing between the two and strides layer interference, improves user communication quality;
When the customer service of family base station finish and by up air interface notice macro base station after, macro base station is just with the former Radio Resource recovery of distributing to family base station, is used for other the family base stations in self or the institute overlay area.
2. method that is used for the interference coordination of the network system that family base station interference coordinates, it is characterized in that: family base station receives service request from user, and when existing Radio Resource can't satisfy this professional QoS requirement, initiate the request of Radio Resource register update to the macro base station of its ownership; Whether macro base station allows the Radio Resource register update according to the authentication information of family base station, signatory grade and network condition decision; If the permission register update, then the Radio Resource that this family base station can be used will be determined and inform to macro base station; Before customer service finished, macro base station did not re-use any by the Radio Resource of family base station login, avoided producing mutual interference mutually with family base station; And the term of execution of customer service, macro base station can be adjusted the Radio Resource that use family base station; After customer service finished, the request of Radio Resource register update was initiated once more to macro base station in family base station, and macro base station reclaims the Radio Resource of the original registration in family base station, again the Radio Resource that reclaims was offered other family base station or himself reused.
3. method according to claim 2 is characterized in that: described method comprises following operating procedure:
(1) user who inserts family base station initiates new service request to family base station;
(2) family base station judges according to this service attribute and parameter whether the Radio Resource that has obtained to register can satisfy this professional QoS requirement; If can, then need not to upgrade its Radio Resource, finish this flow process; Otherwise, initiate the request of Radio Resource register update to the macro base station of its ownership by air interface;
(3) macro base station carries out authentication to family base station, if by authentication, then carry out subsequent step (4); Otherwise, return the refuse information of Radio Resource register update, indicate Reason For Denial, make family base station can't obtain usable radio resources, can't provide professional for inserting the user;
(4) macro base station judges whether the Radio Resource that family base station has obtained to register has surpassed signatory grade.If do not surpass, then carry out subsequent step (5); Otherwise, return the refuse information of Radio Resource register update, indicate Reason For Denial, make family base station can only use original Radio Resource to provide professional as the user;
(5) macro base station judges whether this sub-district remains Radio Resource in addition and can provide family base station login to use, if remain Radio Resource in addition, then carries out subsequent step (6); Otherwise, return the refuse information of Radio Resource register update, indicate Reason For Denial, make family base station can only use original Radio Resource to provide professional as the user;
(6) macro base station is the new available radio resources of family base station assigns, and notifies family base station by air interface;
(7) family base station adds newly assigned Radio Resource on original registered Radio Resource basis, its all Radio Resources is redistributed, and used the Radio Resource of redistributing to provide professional as the user;
(8) after customer service finished, the request of Radio Resource register update was initiated to macro base station in family base station: require the professional pairing Radio Resource cancel register to having finished;
(9) macro base station Radio Resource that family base station was registered just now reclaims, and reuses for other family base station or macro base station self.
4. method according to claim 2, it is characterized in that: described method is the access delay that reduces the real time business of family base station, macro base station is each family base station reserved part Radio Resource, is used to provide the starting stage of real time business and non-real-time service to use; Like this, when family base station user initiates real time business, need not to the extra Radio Resource of macro base station application because of it has distributed acquisition part resource, thereby reduce professional access delay.
5. method according to claim 2 is characterized in that: the time sequential routine of the step in the described method (3), (4) and (5) does not have strict the qualification, can according to circumstances adjust accordingly.
6. according to claim 2 or 3 described methods, it is characterized in that: described method further comprises following content of operation: after family base station powers up startup, scan the frequency range that it disposed earlier; If find to be in the macro base station coverage, then enter Radio Resource " controlled " pattern, i.e. order execution in step (1)～(9) by the macro base station unified management; Be not in the macro base station coverage if find, then change special " uncontrolled " pattern over to: thus the time do not exist the layer of striding between family base station and the macro base station to disturb, as long as the same layer of evading between the adjacent family base station that may exist disturbs, promptly the allocation of radio resources of this family base station will be monitored in real time dynamically and adjust accordingly based on self.
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| CN103634919A (en) * | 2013-12-03 | 2014-03-12 | 北京邮电大学 | Household base station and method for distributing resources for same on basis of interference coordination |
| CN103702421A (en) * | 2012-09-28 | 2014-04-02 | 电信科学技术研究院 | Local common resource management method and equipment |
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| CN107889127A (en) * | 2016-09-30 | 2018-04-06 | 英国电讯有限公司 | Method for managing resource, device and the communication system of cell cluster |
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