CN101534560B - Method for harmonizing intercell interference of wireless communication system - Google Patents
Method for harmonizing intercell interference of wireless communication system Download PDFInfo
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Abstract
The invention provides a method and a base station equipment suitable for harmonizing intercell interference of a wireless communication system; wherein the method comprises the following steps: the base station A counts the resource blocks (sensitive resource blocks) used by the interference-sensitive users in the dominative cell and takes the statistics as the sensitive resource information to inform an adjacent base station; the non-sensitive resource blocks are allocated preferably by the adjacent base station according to the received sensitive resource information of the service base station when allocating the resource to the user to be allocated with the resource in the dominative cell. The method and the base station equipment overcome the problems that the existing harmonization technology of the cells has low frequency spectrum utilization ratio, high complexity and the like, and improves the performances of the cell and the user at the edge of the district.
Description
Technical field
The present invention relates to a kind of inter-cell interference coordination method that is suitable for wireless communication system, relate in particular to a kind of inter-cell interference coordination method that is suitable for the next generation wireless communication system.
Background technology
In order to tackle the challenge of broadband access technology; Simultaneously in order to satisfy novel business demand; The tissue of formulation wireless communication standards such as the 3GPP of International Standards Organization is included OFDM (OFDM) technology in the next generation wireless communication system; For example, LTE system and the WiMAX system studied at present.The employing orthogonal frequency division multiplexi can make the user's service signal each other that belongs to same sub-district keep quadrature, thereby avoids user's phase mutual interference of same sub-district, guarantees the accuracy of service signal transmitting-receiving.But the OFDM technology but can't be eliminated the interference between the neighbor cell user.And the two-forty of system in future requirement, need user's Signal to Interference plus Noise Ratio to be greatly improved, and improve Signal to Interference plus Noise Ratio nothing more than improving signal power and reducing by two kinds of methods of interference.Though system has adopted adaptive coding and modulating (AMC), multiple-input, multiple-output many new technologies such as (MIMO) to improve signal power, has brought the lifting of Signal to Interference plus Noise Ratio, from requiring to also have big gap.Therefore, the interference that reduces the minizone has as much as possible just become a research key point of next generation wireless communication system.
Through repeatedly discussing; In 3GPP TR25.814; Name is called " the UTRA physical layer part of evolution: Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA) " and has proposed three types of presence of intercell interference minimizing methods, i.e. interference randomization, interference cancellation and interference coordination.Interference randomization is meant one type of technology disturbing compacting through the randomize interference signal; Disturbing the cancellation technology is through utilize processing gain to disturb one type of technology of compacting at user side; Interference coordination technique then is through the reasonable distribution resource in the minizone, makes used resource quadrature between neighbor cell as far as possible, thereby the interference of minizone is reduced.Because this technology is used flexibly, realize simply, satisfactory for result, become the mainstream technology of presence of intercell interference minimizing very soon.
In the prior art; In order effectively to support interference coordination technique, 3GPP has increased some signaling consumptions between the base station in the discussion in later stage; Be used for resource coordination between the base station; Such as the motion of submitting in March, 2007, motion R1-071806, the motion name is called " common recognition between uplink cells in the power control: Agreement on UL Inter-cell Power Control " and has proposed newly-increased overload indicator signaling (overload indicator) on X2 interface; Be mainly used in the power control of minizone, but the structure of overload indicator and how operating all remains further research; Submit to the motion of 3GPP in November, 2007; Motion R1-075050; The motion name is called " direction of interference coordination/overload indicator between the LTE uplink cells: Way forward on UL ICIC/Overload Indicator for LTE "; Propose in X2 interface newly-increased X designator again, it is mainly used in the Resource Block that ratio that mutual this Cell Edge User in minizone takies is easier to be interfered, and concrete details also remains further research.
Current; Aspect the coordination technique of minizone, there are a lot of schemes successively to be proposed, for example: 05 year early stage motion; Motion R1-050764; The motion name is called " E-UTRA presence of intercell interference processing method: Inter-cell Interference Handling for E-UTRA ", and motion R1-050507, and the motion name is called the presence of intercell interference of coordinating of " the soft-frequency reuse method among the UTRAN LTE: Soft frequency reuse schemefor UTRAN LTE " middle part/soft-frequency reuse that proposes; The method that this static frequency is multiplexing; Though can effectively reduce the interference of minizone, the availability of frequency spectrum is low, edge throughput and cell throughout poor-performing.A large amount of schemes in later stage; For example: motion R1-074984, the motion name is called " method for coordinating semi-static interference: Semi-Static Interference CoordinationMethod ", dynamically is trading off with multiplexing having got of static frequency; And Chinese patent numbers 200510097452.7; Patent name is " based on the Inter-Cell Interference Coordination way of the 3G system evolved network architecture ", and the user in the center of housing estate scope of proposition uses static multiplex mechanism, and the user of cell edge interference region uses dynamic multiplexing mechanism; Though this type of scheme has been done some improvement on the multiplexing basis of static frequency; Performance promotes to some extent, but essential idea still is based upon on the channeling basis, and the lifting of performance receives significant limitation.
And for Chinese patent 200510077609.X, patent name is " a kind of method of eliminating presence of intercell interference ", and the frequency duplex factor as one of this invention is 1, and user terminal sends to adjacent base station through serving BS with the running time-frequency resource information of self using; Adjacent base station need send to said user terminal to the interference user modulation coding mode that uses identical running time-frequency resource if will give the user who self administers with identical time-frequency resource allocating; User terminal is isolated the interference user signal according to the modulation coding mode of interference user from the signal that receives.Though this method availability of frequency spectrum is higher, systematic function depends on the performance of user terminal Multiuser Detection, and along with the increasing of interference source, the complexity of Multiuser Detection also will increase.
The present invention also introduces the coordination system just and reduces the interference of minizone between the base station, solve existing problem in the prior art.
Summary of the invention
The technical problem that the present invention will solve provides a kind of inter-cell interference coordination method that is suitable for wireless communication system; The availability of frequency spectrum that overcomes the coordination technique existence of existing minizone is low; Problems such as complexity height, and effectively promote the performance of sub-district and Cell Edge User.
In order to address the above problem, the invention provides a kind of inter-cell interference coordination method that is suitable for wireless communication system, may further comprise the steps:
Disturbing the employed Resource Block of sensitive users in its administration sub-district of base station A statistics is the sensitive resource piece, notifies adjacent base station as sensitive resource information;
Adjacent base station is according to the sensitive resource information of the serving BS received, when administering the resource user Resources allocation to be allocated of sub-district for it, and the non-sensitive Resource Block of priority allocation.
Further, base station A still notifies adjacent base station as sensitive resource information with the jamming margin of the sensitive resource piece that counts;
When non-sensitive resource block assignments is failed; Adjacent base station calculates the potential interference parameter of resource user to be allocated; Be lower than the jamming margin of sensitive resource piece to be allocated like this potential interference parameter, then adjacent base station is distributed to resource user to be allocated in its administration sub-district with this sensitive resource; Otherwise, this sensitive resource piece of adjacent base station dispensed.
Further; Said this sensitive resource of adjacent base station dispensed is for refusal is this maybe reallocation resource and allowance use after the power of this resource user reduction designated magnitude to be allocated makes its potential interference parameter be lower than jamming margin of this sensitive resource of resource user distribution to be allocated.
Further, adjacent base station obtains said potential interference parameter through signal strength signal intensity or the signal to noise ratio of measuring its resource user to be allocated, equals said signal strength signal intensity or signal to noise ratio direct ratio multi-user factor of influence on its numerical value.
Further, said multi-user's factor of influence, value zero to one between, set according to the network planning situation of reality by system.
Further, adopt wireless or wired mode mutual between said base station, carry of the combination realization of the mode of sensitive resource piece: X designator or overload indicator through following one or more signalings.
Further, when said base station A adds up the sensitive resource piece in its administration sub-district, choose through the qualification of following one or more conditions combinations:
A, the shared resource of the user of geographical position outside setting range in its administration sub-district; B, channel condition is reduced to the resource of the CU of certain thresholding in its administration sub-district.
Further; When base station A detect the adjacent base station user to the interference of base station A surpass one set thresholding the time; Trigger base station A and produce sensitive resource information and notify adjacent base station, adjacent base station carries out the respective resources allocation process according to the said sensitive resource information of receiving.
In order to address the above problem, the present invention also provides a kind of base station equipment, comprising: resource distribution module, message processing module and signal transmitting and receiving module; Wherein,
Said message processing module is used to add up that the employed Resource Block of interference sensitive users is sensitive resource piece and the jamming margin corresponding with the sensitive resource piece in its base station administration sub-district, place, notifies said signal transmitting and receiving module as sensitive resource information;
Said signal transmitting and receiving module is used for said sensitive resource information is sent to adjacent base station, or the sensitive resource information sent of receiving neighbor bs, and sends to said resource distribution module;
Said resource distribution module is received the sensitive resource information of adjacent base station from said signal transmitting and receiving module, for resource user to be allocated of its administration sub-district, base station, place distributes non-sensitive Resource Block.
Further, said message processing module also is used to calculate its base station, place and administers the potential interference parameter of the resource user to be allocated of sub-district, and sends to said resource distribution module;
Said resource distribution module; Also be used to receive the potential interference parameter of sending the resource user to be allocated of its administration sub-district, base station, place by said message processing module; In conjunction with the sensitive resource information of the adjacent base station of receiving by said signal transmitting and receiving module, be the resource user distribution sensitive resource piece to be allocated of its administration sub-district, base station, place.
Further, said message processing module obtains said potential interference parameter through measuring its signal strength signal intensity or signal to noise ratio that belongs to the resource user to be allocated of base station, equals said signal strength signal intensity or signal to noise ratio direct ratio multi-user factor of influence on its numerical value.
Further, said message processing module, when adding up the sensitive resource piece in its administration sub-district, base station, place, choose through the qualification of following one or more condition combinations:
A, the shared resource of the user of geographical position outside setting range in its administration sub-district, base station, place; B, channel condition is reduced to the resource of the CU of certain thresholding in its administration sub-district, base station, place.
Further; Said signal transmitting and receiving module; Also be used to detect the interference of adjacent base station user to this base station, module place; When surpass one set thresholding the time, trigger said message processing module and produce sensitive resource information, and receive the sensitive resource information that said message processing module transmits and make corresponding subsequent treatment.
Compared with prior art; The availability of frequency spectrum that the present invention overcomes the coordination technique existence of existing minizone is low; Problems such as complexity height can effectively suppress the interference of minizone through between the base station, introducing the coordination system, thereby promote the performance of sub-district and Cell Edge User.
Description of drawings
Fig. 1 is the multiplexing scene sketch map of terminal wireless resource in the embodiment of the invention;
Fig. 2 is the method flow diagram of Inter-Cell Interference Coordination in the embodiment of the invention;
Fig. 3 is a base station equipment structural representation in the embodiment of the invention.
Embodiment
The present invention is in order to solve the drawback that conventional solution exists; Further set forth a kind of inter-cell interference coordination method that is suitable for wireless communication system of the present invention through following specific embodiment; Below embodiment is described in detail, but not as to qualification of the present invention.
The method of this presence of intercell interference of the present invention; Through between the base station, transmitting the sensitive resource set of blocks; Make the base station obtain other sub-districts, thereby before giving the compass of competency user resource allocation, avoid the use of the resource of indicating in the sensitive resource set of blocks as much as possible than the Resource Block that is easier to be interfered.
Core thinking: the sensitive resource piece (disturbing the employed Resource Block of sensitive users is the sensitive resource piece) in its administration sub-district of serving BS statistics; And the corresponding jamming margin of each sensitive resource piece; And with the two as sensitive resource information notice adjacent base station, adjacent base station is administered non-sensitive resource of resource user priority allocation to be allocated of sub-district for it;
When the customer volume of base station is big; Non-sensitive resource allocation failure; Need take the resource of sensitive resource piece indication; Through measuring compass of competency user's potential interference parameter, whether decision distributes the resource identical with neighbor cell: if the potential interference parameter of the resource user to be allocated of adjacent base station administration sub-district is lower than the jamming margin of sensitive resource piece, then adjacent base station is distributed to said resource user to be allocated with this sensitive resource piece and is permitted using; Otherwise, this sensitive resource piece of adjacent base station dispensed.
In Fig. 1, the serving BS at terminal 1 is NB1, and takies resource k, supposes that here k is the sensitive resource piece;
The serving BS at terminal 2 and terminal 3 is NB2, and NB2 is the adjacent base station of NB1, and when NB2 distributes sensitive resource k need for the user terminal 2 of being administered or terminal 3, interference will be caused to NB1 in terminal 2 or terminal 3, dot among the figure.
At this moment whether distribute this resource, depend on whether the potential interference of terminal 2 or the 3 couples of NB1 in terminal surpasses the jamming margin of sensitive resource k.Here suppose that terminal 2 application transmitting powers are P1, the transmitting power of terminal 3 applications is P2.
When serving BS can the user who detects adjacent base station to its interference surpass one set thresholding the time; Trigger sensitive resource piece and corresponding jamming margin in its administration sub-district of serving BS statistics; And pass through inter-base station interface and notify adjacent base station with statistics as sensitive resource information, carry out the respective resources allocation process; It is carefully stated as follows:
Based on connection shown in Figure 1, inter-cell interference coordination method flow process of the present invention is as shown in Figure 2, comprises following steps:
Step 201: its administration sub-district sensitive resource set of blocks of serving BS NB1 statistics, and the corresponding jamming margin of each sensitive resource piece, note is made (k, I
Allowed), wherein k is the Resource Block numbering, I
AllowedJamming margin for respective resources;
When the sensitive resource piece in its administration sub-district is added up in the base station; Qualification through following one or more conditions combination is chosen: the geographical position is the shared resource of the user outside the setting range (user who is in outside the setting range generally is the position that is in cell edge) in its administration sub-district, or it administers the resource that channel condition in sub-district is reduced to the CU of certain thresholding;
For the calculating of jamming margin, adopt the scheme processing of prior art to get final product, its essence representes that a Resource Block can hold the adjacent base station interference capability, and is as the thresholding of a measurement, relevant with signal to noise ratio, the processing gain of this Resource Block; Also can rule of thumb directly set here, perhaps use like other parameters such as carrier/interface ratios by the staff;
Step 202: base station NB1 informs adjacent base station NB2 as sensitive resource information through inter-base station interface with the jamming margin of this sensitive resource set of blocks and each sensitive resource piece;
Inter-base station interface adopts wireless or wired mode mutual, carries the combination realization of the mode of sensitive resource piece through following one or more signalings: X designator or overload indicator;
Step 203: adjacent base station NB2 distributes non-sensitive resource according to the sensitive resource piece in the sensitive resource information that receives for the user who self administers; And judge whether noiseless distribution is successful; If success finishes this interference coordination process, otherwise execution in step 204;
Said noiseless distribution is meant that successfully user terminal 2 that adjacent base station NB2 is administered or terminal 3 needn't use the resource k identical with terminal 1, just can satisfy the resource user demand of self institute's administrative area intra domain user.Because adjacent base station NB2 avoids the use of the running time-frequency resource identical with terminal 1, so can not cause the interference to terminal 1.
If the customer volume of adjacent base station NB2 is bigger, above-mentioned noiseless distribution failure, adjacent base station must be with using for the administrative area intra domain user with terminal 1 identical resource allocation.In the present embodiment, the running time-frequency resource identical with terminal 1 all might be used in terminal 2 and terminal 3, and so promptly above-mentioned noiseless distribution failure is execution in step 204.
Step 204: adjacent base station NB2 assesses the potential interference parameter of the user of sensitive resource to be allocated to base station NB1.
The resource of terminal 2 or terminal 3 uses maybe be identical with terminal 1 in this example, and base station NB2 will assess the interference parameter of terminal 2 and the 3 couples of base station NB1 in terminal.
Step 205: if the potential interference of this user surpasses the jamming margin I of base station NB1 sensitive resource piece
Allowed, this resource is used in the restriction of neighbor cell base station NB2 considered, otherwise, can give this user with this resource allocation.
In this example, because the transmitting power P＞α I at terminal 2
AllowedPL
UE2-＞NB1, when base station NB2 gives terminal 2 Resources allocation k, should use resource k by limiting terminal 2, however the transmitting power P at terminal 3≤α I
AllowedPL
UE3-＞NB1, when base station NB2 gives terminal 3 Resources allocation k, will permit terminal 3 and use;
PL wherein
UE2-＞NB1The path loss at expression terminal 2 to base station NB1, PL
UE3-＞NB1The path loss at expression terminal 3 to base station NB1, what α represented is multi-user's factor of influence, α ∈ (0,1) is confirmed by real network planning;
And resource is used in restriction, can be that power that refusal distributes these resources or terminal 2 to reduce designated magnitude for terminal 2 is lower than this interference parameter to distribute behind the jamming margin again and permits use.
As shown in Figure 3, be base station equipment structural representation in the embodiment of the invention, comprising: resource distribution module 30, message processing module 31 and signal transmitting and receiving module 32; Wherein,
Said message processing module 31; Be used to add up that the employed Resource Block of interference sensitive users is sensitive resource piece and the jamming margin corresponding with the sensitive resource piece in its base station administration sub-district, place; Notify said signal transmitting and receiving module 32 as sensitive resource information; Also be used to calculate its base station, place and administer the potential interference parameter of the resource user to be allocated of sub-district, and send to said resource distribution module 30;
Said signal transmitting and receiving module 32 is used for said sensitive resource information is sent to adjacent base station, or the sensitive resource information sent of receiving neighbor bs, and sends to said resource distribution module 30; Also be used to detect the interference of adjacent base station user to this base station, module place; When surpassing the thresholding of a setting; Trigger said message processing module 31 and produce the sensitive resource information, and receive the sensitive resource information that said message processing module 31 transmits and make corresponding subsequent treatment.
Said resource distribution module 30; The sensitive resource information of the adjacent base station that reception is sent from said signal transmitting and receiving module 32; In conjunction with the potential interference parameter of resource user to be allocated in its administration sub-district, base station, place of being sent by said message processing module 31, the resource user to be allocated of administering the sub-district for its base station, place distributes corresponding sensitivity and non-sensitive resource.
Attention: in a continuum, use in a plurality of base stations in same asset space in the network, each base station all can be used as said serving BS, and promptly same base station promptly can be used as serving BS, also can be used as the target BS of adjacent base station.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. an inter-cell interference coordination method that is suitable for wireless communication system is characterized in that, may further comprise the steps:
Disturbing the employed Resource Block of sensitive users in its administration sub-district of base station A statistics is the jamming margin of sensitive resource piece and sensitive resource piece, notifies adjacent base station as sensitive resource information;
Adjacent base station is according to the sensitive resource information of the serving BS received, when administering the resource user Resources allocation to be allocated of sub-district for it, and the non-sensitive Resource Block of priority allocation;
When non-sensitive resource block assignments is failed; Adjacent base station calculates the potential interference parameter of resource user to be allocated; Equal the signal strength signal intensity or the signal to noise ratio of resource user to be allocated on the said potential interference parameter numerical value; Be lower than the jamming margin of sensitive resource piece to be allocated like this potential interference parameter, then adjacent base station is distributed to resource user to be allocated in its administration sub-district with this sensitive resource; Otherwise, this sensitive resource piece of adjacent base station dispensed.
2. the method for claim 1; It is characterized in that; Said this sensitive resource of adjacent base station dispensed is for refusal is this maybe reallocation resource and allowance use after the power of this resource user reduction designated magnitude to be allocated makes its potential interference parameter be lower than jamming margin of this sensitive resource of resource user distribution to be allocated.
3. according to claim 1 or claim 2 method is characterized in that adjacent base station obtains said potential interference parameter through signal strength signal intensity or the signal to noise ratio of measuring its resource user to be allocated.
4. the method for claim 1 is characterized in that, adopts wireless or wired mode mutual between said base station, carries the combination realization of the mode of sensitive resource piece through following one or more signalings: X designator or overload indicator.
5. the method for claim 1 is characterized in that, when said base station A adds up the sensitive resource piece in its administration sub-district, chooses through the qualification of following one or more conditions combinations:
A, the shared resource of the user of geographical position outside setting range in its administration sub-district; B, channel condition is reduced to the resource of the CU of certain thresholding in its administration sub-district.
6. the method for claim 1; It is characterized in that; When base station A detect the adjacent base station user to the interference of base station A surpass one set thresholding the time; Trigger base station A and produce sensitive resource information and notify adjacent base station, adjacent base station carries out the respective resources allocation process according to the said sensitive resource information of receiving.
7. a base station equipment is characterized in that, comprising: resource distribution module, message processing module and signal transmitting and receiving module; Wherein,
Said message processing module is used to add up that the employed Resource Block of interference sensitive users is sensitive resource piece and the jamming margin corresponding with the sensitive resource piece in its base station administration sub-district, place, notifies said signal transmitting and receiving module as sensitive resource information; Also be used to calculate its base station, place and administer the potential interference parameter of the resource user to be allocated of sub-district, and send to said resource distribution module, equal the signal strength signal intensity or the signal to noise ratio of resource user to be allocated on the said potential interference parameter numerical value;
Said signal transmitting and receiving module is used for said sensitive resource information is sent to adjacent base station, or the sensitive resource information sent of receiving neighbor bs, and sends to said resource distribution module;
Said resource distribution module is received the sensitive resource information of adjacent base station from said signal transmitting and receiving module, for resource user to be allocated of its administration sub-district, base station, place distributes non-sensitive Resource Block; Also be used to receive the potential interference parameter of sending the resource user to be allocated of its administration sub-district, base station, place by said message processing module; When non-sensitive resource block assignments is failed; Be lower than the jamming margin of sensitive resource piece to be allocated like this potential interference parameter, then adjacent base station is distributed to resource user to be allocated in its administration sub-district with this sensitive resource; Otherwise, this sensitive resource piece of adjacent base station dispensed.
8. base station equipment as claimed in claim 7 is characterized in that, said message processing module obtains said potential interference parameter through measuring its signal strength signal intensity or signal to noise ratio that belongs to the resource user to be allocated of base station.
9. base station equipment as claimed in claim 7 is characterized in that, said message processing module when adding up the sensitive resource piece in its administration sub-district, base station, place, is chosen through the qualification of following one or more condition combinations:
A, the shared resource of the user of geographical position outside setting range in its administration sub-district, base station, place; B, channel condition is reduced to the resource of the CU of certain thresholding in its administration sub-district, base station, place.
10. base station equipment as claimed in claim 7; It is characterized in that; Said signal transmitting and receiving module also is used to detect the interference of adjacent base station user to this base station, module place, when surpassing the thresholding of a setting; Trigger said message processing module and produce sensitive resource information, and receive the sensitive resource information that said message processing module transmits and make corresponding subsequent treatment.
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| CN103906118A (en) * | 2012-12-25 | 2014-07-02 | 中国移动通信集团湖北有限公司 | WLAN network terminal uplink interference evaluation method and device |
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| CN102065549A (en) * | 2009-11-16 | 2011-05-18 | 中国移动通信集团公司 | Interference management method and system in wireless layering network and base station |
| CA2784035C (en) * | 2010-03-29 | 2020-07-21 | Lg Electronics Inc. | Method and apparatus for measurement for inter-cell interference coordination in radio communication system |
| CN102271337B (en) * | 2010-06-03 | 2015-09-16 | 中兴通讯股份有限公司 | The processing method of Inter-Cell Interference Coordination information and device |
| WO2012016387A1 (en) * | 2010-08-06 | 2012-02-09 | 富士通株式会社 | Inter-cell interference coordination method and device for control channel and data channel |
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| CN102186155A (en) * | 2011-05-03 | 2011-09-14 | 中兴通讯股份有限公司 | Interactive method and system for intercell information |
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| CN103139780B (en) * | 2011-11-24 | 2018-01-19 | 江苏通软科技有限公司 | inter-cell interference coordination method and device |
| US10182450B2 (en) | 2012-02-28 | 2019-01-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Inter-cell interference mitigation |
| EP2820903B1 (en) * | 2012-02-28 | 2017-08-02 | Telefonaktiebolaget LM Ericsson (publ) | Inter-cell interference mitigation |
| JP6291065B2 (en) | 2013-09-25 | 2018-03-14 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ | Wireless communication method, eNode B, and user equipment |
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