CN101998645A - Carrier selection method and device - Google Patents
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- CN101998645A CN101998645A CN2009101675145A CN200910167514A CN101998645A CN 101998645 A CN101998645 A CN 101998645A CN 2009101675145 A CN2009101675145 A CN 2009101675145A CN 200910167514 A CN200910167514 A CN 200910167514A CN 101998645 A CN101998645 A CN 101998645A
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Abstract
The invention discloses carrier selection method and device. The method comprises the steps of: determining carrier aggregation information by a base station, wherein, the carrier aggregation information comprises the size of a carrier which can participate in a carrier pre-aggregation, the bandwidth capacity of a user terminal and the new set number of the carrier pre-aggregation; selecting carrier members from the new set number of the carrier pre- aggregation to form a carrier set so as to complete the pre- aggregation by the base station according to cell interference condition and a determined size; and selecting the carriers from the carrier set participating in the pre- aggregation according to the bandwidth capacity of the user terminal and the determined size to complete the aggregation. The invention ensures the communication quality in wireless communication networks.
Description
Technical field
The present invention relates to the communications field, particularly, relate in particular to a kind of carrier selecting method and device.
Background technology
At present, in follow-on broadband wireless communication network, how to solve in the cordless communication network and to support bigger bandwidth to become a key factor that improves inter-cell user terminal throughput and user terminal average throughput under the bandwidth in current wireless communication system and be faced with formidable challenges.
At third generation partner program (3rd Generation Partnership Project, abbreviate 3GPP as) long-term technology evolution (Long Term Evolution, abbreviate LTE as) in all propose to adopt the mode of carrier aggregation to come in current wireless communication system, to support effectively bigger bandwidth, to satisfy in the new generation of wireless standard demand to indexs such as throughput, peak rates.Carrier aggregation is to support the key technology of bigger bandwidth in the future broadband wireless communication systems, by different carrier waves is carried out polymerization, form the carrier wave of bigger bandwidth, the UT that support has stronger ability on the bandwidth after the polymerization, for example, the bandwidth that surpasses 100MHz in the advanced long-term evolution system (Long-Term Evolution Advance abbreviates LTE-Advanced as).
But at present the carrier aggregation of discussing among the LTE-Advanced is not considered the influence of the presence of intercell interference that inter-cell user terminal (UT) throughput and user terminal (UT) average throughput are played an important role, if the carrier wave of polymerization partly is subjected to serious presence of intercell interference, even then obtained bigger bandwidth, also can make because serious presence of intercell interference uses the throughput and the rate capability of the user terminal (UT) of this partially polymerized carrier wave seriously to descend, thereby offset the benefit that carrier aggregation is brought.
At in the carrier aggregation in the correlation technique owing to considering that not presence of intercell interference causes the throughput of user terminal and the serious problem that descends of rate capability of polymerization carrier wave, does not propose effective solution at present as yet.
Summary of the invention
At in the carrier aggregation owing to considering that not presence of intercell interference causes the throughput of user terminal of polymerization carrier wave and the serious problem that descends of rate capability to propose the present invention, for this reason, main purpose of the present invention is to provide a kind of carrier wave selection scheme, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of carrier selecting method.
Carrier selecting method according to the present invention comprises: carrier aggregation information is determined in the base station, and wherein, carrier aggregation information comprises: the prepolymerized new set number of size, the bandwidth ability of user terminal, carrier wave that can participate in the prepolymerized carrier wave of carrier wave; Carrier wave formation carrier set is selected to form according to area interference situation and definite size in the base station from the prepolymerized new set number of carrier wave, finish prepolymerization; The base station selects carrier wave to finish polymerization from participate in prepolymerized carrier set according to bandwidth ability and definite size of user terminal.
Preferably, the base station determines that the size that can participate in the prepolymerized carrier wave of carrier wave comprises: the base station is according to the bandwidth types of all supports and the definite size that can participate in the prepolymerized carrier wave of carrier wave of bandwidth ability of user terminal.
Preferably, the base station determines that the prepolymerized new set number of carrier wave comprises: the prepolymerized new set number of carrier wave is determined according to the bandwidth ability of user terminal in the base station.
Preferably, select from participate in prepolymerized carrier set according to the bandwidth ability of user terminal and definite size after carrier wave finishes polymerization in the base station, said method also comprises: the base station judges whether the carrier wave of selecting satisfies the bandwidth ability of user terminal; In judged result is under the situation that is, aggregation processing is carried out with the carrier wave of selecting in the base station.
Preferably, after the base station judged whether the carrier wave of selecting satisfies the bandwidth ability of user terminal, said method also comprised: in judged result is that new carrier wave is selected in the base station under the situation not from have neither part nor lot in prepolymerized other carrier waves; If the new carrier wave of selecting and participate in the bandwidth ability that prepolymerized part carrier wave carries out satisfying after the polymerization user terminal, the new carrier wave that then will select and partly carry out aggregation processing; Otherwise the base station discharges has selected to carry out prepolymerized composition carrier wave, and is having neither part nor lot in the new resource of selection on prepolymerized other carrier waves.
To achieve these goals, according to another aspect of the present invention, provide a kind of carrier wave choice device.
Carrier wave choice device according to the present invention comprises: determination module is used for determining carrier aggregation information that wherein, carrier aggregation information comprises: the prepolymerized new set number of size, the bandwidth ability of user terminal, carrier wave that can participate in the prepolymerized carrier wave of carrier wave; First selects module, is used for selecting to form carrier wave formation carrier set according to area interference situation and the definite size of determination module from the prepolymerized new set number of carrier wave, finishes prepolymerization; The polymerization module, the size that is used for determining according to the bandwidth ability and the determination module of user terminal selects carrier wave to finish polymerization from the prepolymerized carrier set of first participation of selecting module to select.
Preferably, determination module comprises: first determines submodule, is used for according to the bandwidth types of all supports and the definite size that participates in the prepolymerized carrier wave of carrier wave of bandwidth ability of user terminal.
Preferably, determination module comprises: second determines submodule, is used for determining the prepolymerized new set number of carrier wave according to the bandwidth ability of user terminal.
Preferably, said apparatus also comprises: judge module is used to judge whether the carrier wave of polymerization module selection satisfies the bandwidth ability of user terminal; Processing module, the judged result that is used at judge module is under the situation that is, the carrier wave that the polymerization module is selected carries out aggregation processing.
Preferably, said apparatus also comprises: second selects module, and the judged result that is used at judge module is under the situation not, selects new carrier wave from have neither part nor lot in prepolymerized other carrier waves; Processing module also is used for selecting the new carrier wave that module selects and participating in satisfying after prepolymerized part carrier wave carries out polymerization under the situation of bandwidth ability of user terminal second, and second new carrier wave and the part of selecting module to select carried out aggregation processing; Release module is used for selecting the new carrier wave that module selects and participating in not satisfying after prepolymerized part carrier wave carries out polymerization under the situation of bandwidth ability of user terminal second, discharges and has selected to carry out prepolymerized composition carrier wave; The 3rd selects module, is used for selecting the new carrier wave that module selects and participating in not satisfying after prepolymerized part carrier wave carries out polymerization under the situation of bandwidth ability of user terminal second, is having neither part nor lot in the new resource of selection on prepolymerized other carrier waves.
By the present invention, the base station selects composition carrier wave formation carrier set to finish prepolymerization from the prepolymerized new set number of carrier wave according to area interference situation and definite size; The base station selects carrier wave to finish polymerization from participate in prepolymerized carrier set according to bandwidth ability and definite size of user terminal, solved in the carrier aggregation owing to considering that not presence of intercell interference causes the throughput and the serious problem that descends of rate capability of the user terminal of polymerization carrier wave, and then guaranteed the communication quality in the cordless communication network.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the carrier selecting method of the embodiment of the invention;
Fig. 2 is the detail flowchart according to the carrier selecting method of the embodiment of the invention;
Fig. 3 is the structured flowchart according to the carrier wave choice device of the embodiment of the invention;
Fig. 4 is the preferred structure block diagram according to the carrier wave choice device of the embodiment of the invention.
Embodiment
Functional overview
Consider in the carrier aggregation owing to considering that not presence of intercell interference causes the throughput and the serious problem that descends of rate capability of the user terminal of polymerization carrier wave, the embodiment of the invention provides a kind of carrier wave selection scheme, the carrier aggregation that relates in this scheme is to support the key technology of bigger bandwidth in the future broadband wireless communication systems, by base station (Base Station, abbreviate BS as) determine (the User Terminal of user terminal in the cordless communication network, abbreviate UT as) bandwidth ability, the base station is with the grouping of different bandwidth ability and carry out the carrier wave prepolymerization, forms new when having bigger bandwidth ability and in the existing wireless communications network system the new main carrier of the bandwidth ability backward compatibility of part UT gather.More flexible for prepolymerized new main carrier set is used, prepolymerized carrier wave can be positioned at different carrier frequency, and, can do corresponding adjustment to the position and the size of prepolymerization carrier wave according to the needs of carrier aggregation.Gather the requirement that to satisfy cordless communication network in order to ensure the new main carrier that prepolymerization forms, the new main carrier set that forms after the prepolymerization must the backward compatibility cordless communication network in all bandwidth ability, simultaneously, can be according to the variation of wireless communication network environments, new main carrier was gathered after formation can be supported the new prepolymerization of more bandwidth ability, and can expand the carrier number that the prepolymerization carrier wave uses, the various demands that adapt to new cordless communication network guarantee the communication quality in the cordless communication network.
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Method embodiment
According to embodiments of the invention, provide a kind of carrier selecting method.Fig. 1 is the flow chart according to the carrier selecting method of the embodiment of the invention, and as shown in Figure 1, this method comprises that following step S102 is to step S106:
Step S102, carrier aggregation information is determined in the base station, wherein, carrier aggregation information comprises: the prepolymerized new set number of size, the bandwidth ability of user terminal, carrier wave that can participate in the prepolymerized carrier wave of carrier wave.
Wherein, the base station is according to the bandwidth types of all supports and the definite size that can participate in the prepolymerized carrier wave of carrier wave of bandwidth ability of user terminal; The prepolymerized new set number of carrier wave is determined according to the bandwidth ability of user terminal in the base station, that is to say that the bandwidth ability of user terminal is determined in the base station, will influence the number and the size of the carrier wave of polymerization.
Particularly, the base station is determined to participate in the size of carrier wave part of carrier wave prepolymerization polymerization, because new system must have the rigid demand of backward compatibility to legacy system, therefore, in new system, may have the user terminal in the legacy system, and the bandwidth demand of the user terminal that carries in user terminal that can carry in the new system and the legacy system has very big-difference, for example, in the LTE system, has 10MHz, the bandwidth of types such as 20MHz, and there is the bandwidth that reaches 100MHz in meeting in LTE-Advanced, therefore, the base station must be put in order the bandwidth types of all supports, makes carrier aggregation can support the bandwidth of these all types.
Above-mentioned base station determines that the prepolymerized new set number of carrier wave is meant in the bandwidth ability of all user terminals, select which compound mode to form new prepolymerized carrier set, for example, when if the bandwidth ability of user terminal is 3MHz, 5MHz, 10MHz, 15MHz, 20MHz, 100MHz, can select the carrier wave of the polymerization methods covering 15MHz of 3MHz and 5MHz, the polymerization methods of 2 10MHz and 4 20MHz covers the carrier wave of 100MHz.Like this, the carrier wave that wireless communication system is medium and small is merged into bigger carrier wave, improves spectrum utilization efficiency; And the bandwidth ability of compatible multiple user terminal simultaneously on the new carrier wave that forms after the prepolymerization has reduced the overhead of base station when scheduling of resource.
Step S104, carrier wave formation carrier set is selected to form according to area interference situation and definite size in the base station from the prepolymerized new set number of carrier wave, finish prepolymerization.
Particularly, the base station is according to disturbed condition, select to form carrier wave and finish prepolymerization, be meant the disturbance regime that when selecting prepolymerized composition carrier wave, will consider current wireless communication system and user terminal, base station selected those disturb less carrier wave to carry out prepolymerization, help improving the new spectrum of carrier efficient that forms after the prepolymerization.
In addition, can be in the carrier wave prepolymerization according to the situation of system, as the variation of load state, ability of user terminal and the situation of presence of intercell interference, can redistribute and can increase or reduce the resource of prepolymerization part to prepolymerized resource, help improving the utilance of resource.
Step S106, the base station selects carrier wave to finish polymerization from participate in prepolymerized carrier set according to bandwidth ability and definite size of user terminal.
After this, the base station judges whether the carrier wave of selecting satisfies the bandwidth ability of user terminal; In judged result is under the situation that is, aggregation processing is carried out with the carrier wave of selecting in the base station; In judged result is under the situation not, new carrier wave is selected in the base station from have neither part nor lot in prepolymerized other carrier waves, if the new carrier wave of selecting and participate in the bandwidth ability that prepolymerized part carrier wave carries out satisfying after the polymerization user terminal, the new carrier wave that then will select and part are carried out aggregation processing, otherwise, the base station discharges has selected to carry out prepolymerized composition carrier wave, and is having neither part nor lot in the new resource of selection on prepolymerized other carrier waves.Like this, new carrier set that forms after the prepolymerization and the associated working pattern that has neither part nor lot in prepolymerized carrier wave have been finished, to support backward compatibility to user terminals all in the wireless communication system.And the base station is carried out aggregation processing with the carrier resource of selecting and is formed carrier wave after the new polymerization to satisfy the bandwidth ability of user terminal, finally obtains the carrier resource that the base station is a scheduling of user terminals.
Need to prove, in the carrier aggregation based on resource reservation in the embodiment of the invention, variation along with the residing condition of user terminal, such as, the change of the moving of user terminal, ability of user terminal etc., if user terminal uses the new carrier wave that forms after the polymerization to produce the strategy that does not satisfy presence of intercell interference in the current system again, then still can reuse the method based on resource reservation provided by the invention and reselect new resource.
By this embodiment, if user terminal can not satisfy the strategy of the presence of intercell interference in the current system when the enterprising line data transmission/reception of newly assigned carrier resource, then the new carrier resource that satisfies presence of intercell interference will be sought again to user terminal in the base station according to the strategy of presence of intercell interference, guaranteeing that user terminal has under the situation of less presence of intercell interference, make full use of the prepolymerized carrier resource of carrier wave like this.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Fig. 2 is the detail flowchart according to the carrier selecting method of the embodiment of the invention, as shown in Figure 2, based on the flow chart of the prepolymerized composition carrier selecting method of carrier wave, comprises that following step S201 is to step S208:
Step S201: the definite size that can participate in the carrier wave part of carrier wave prepolymerization polymerization in base station.
Step S202: the bandwidth ability of user terminal is determined in the base station.
Step S203: the prepolymerized new set number of carrier wave is determined in the base station.
Step S204: the base station is selected to form carrier wave and is finished prepolymerization according to disturbed condition.
Step S205: the base station selects carrier wave to finish polymerization from prepolymerized carrier set according to the user terminal bandwidth ability, judge whether the prepolymerization carrier wave of selecting satisfies the user terminal bandwidth ability, if judged result is for being, then proceed to step S208, if judge that structure for not, proceeds to step S206.
Step S206: new carrier wave is selected in the base station from have neither part nor lot in prepolymerized other carrier waves of carrier wave, judge whether selection in the new carrier wave of selecting and the prepolymerization carrier wave can satisfy the demand of user terminal after partially polymerized, if judged result is for being, then proceed to step S208, if judged result proceeds to step S207 for not.
Step S207: the base station discharges the prepolymerization carrier resource of having selected, and is having neither part nor lot in the new resource of selection on prepolymerized other carrier waves of carrier wave.
Step S208: the base station is carried out aggregation processing with the carrier resource of selecting and is formed carrier wave after the new polymerization to satisfy the bandwidth ability of user terminal.
By this embodiment, thisly be merged into bigger carrier wave based on the prepolymerized composition carrier selecting method of the carrier wave carrier wave that wireless communication system is medium and small, improve spectrum utilization efficiency; The bandwidth ability of compatible multiple user terminal simultaneously on the new carrier wave that forms after the prepolymerization has reduced the overhead of base station when scheduling of resource.
Need to prove, in prepolymerized composition carrier wave is selected based on carrier wave, variation along with the residing condition of user terminal, such as, the change of the moving of user terminal, ability of user terminal etc., if user terminal uses the new carrier wave that forms after the polymerization to produce the strategy that does not satisfy presence of intercell interference in the current system again, then still can reuse and provided by the inventionly reselect new resource based on the prepolymerized method of carrier wave.
Device embodiment
According to embodiments of the invention, provide a kind of carrier wave choice device.Fig. 3 is the structured flowchart according to the carrier wave choice device of the embodiment of the invention, and as shown in Figure 3, this device comprises: determination module 31, first is selected module 32, polymerization module 33, below said structure is described.
Fig. 4 is the preferred structure block diagram according to the carrier wave choice device of the embodiment of the invention, as shown in Figure 4:
This device also comprises: judge module 43, processing module 44, second select module 45, release module the 46, the 3rd to select module 47, below said structure are described.
Second selects module 45, be connected to judge module 43 and processing module 44, the judged result that is used at judge module 43 is under the situation not, from have neither part nor lot in prepolymerized other carrier waves, select new carrier wave, so that processing module 44 is selected the new carrier wave that module 45 selects and participated in satisfying after prepolymerized part carrier wave carries out polymerization under the situation of bandwidth ability of user terminal second, second new carrier wave and the part of selecting module 45 to select carried out aggregation processing.
In sum, pass through the above embodiment of the present invention, provide a kind of based on the prepolymerized composition carrier wave of carrier wave selection scheme, considered the processing of presence of intercell interference, the bandwidth ability of user terminal in the cordless communication network is determined in the base station, the base station is with the grouping of different bandwidth ability and carry out the carrier wave prepolymerization, forms new when having bigger bandwidth ability and in the existing wireless communications network system the new main carrier of the bandwidth ability backward compatibility of part user terminal gather.More flexible for prepolymerized new main carrier set is used, prepolymerized carrier wave can be positioned at different carrier frequency, and, can do corresponding adjustment to the position and the size of prepolymerization carrier wave according to the needs of carrier aggregation.Gather the requirement that to satisfy cordless communication network in order to ensure the new main carrier that prepolymerization forms, the new main carrier set that forms after the prepolymerization must the backward compatibility cordless communication network in all bandwidth ability, simultaneously, can be according to the variation of wireless communication network environments, new main carrier was gathered after formation can be supported the new prepolymerization of more bandwidth ability, and can expand the carrier number that the prepolymerization carrier wave uses, the various demands that adapt to new cordless communication network guarantee that the communication quality in the cordless communication network is a kind of blanket, easy, easy-to-use scheme.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a carrier selecting method is characterized in that, comprising:
Carrier aggregation information is determined in the base station, and wherein, described carrier aggregation information comprises: the prepolymerized new set number of size, the bandwidth ability of user terminal, carrier wave that can participate in the prepolymerized carrier wave of carrier wave;
Carrier wave formation carrier set is selected to form according to area interference situation and definite described size in described base station from the prepolymerized new set number of described carrier wave, finish prepolymerization;
Described base station selects carrier wave to finish polymerization from participate in described prepolymerized described carrier set according to bandwidth ability and definite described size of described user terminal.
2. method according to claim 1 is characterized in that, described base station determines that the described size that can participate in the prepolymerized carrier wave of carrier wave comprises:
The described size that can participate in the prepolymerized carrier wave of carrier wave is determined according to the bandwidth types of all supports and the bandwidth ability of described user terminal in described base station.
3. method according to claim 1 is characterized in that, described base station determines that the prepolymerized new set number of described carrier wave comprises:
The prepolymerized new set number of described carrier wave is determined according to the bandwidth ability of described user terminal in described base station.
4. according to each described method in the claim 1 to 3, it is characterized in that, select from participate in described prepolymerized described carrier set according to the bandwidth ability of described user terminal and definite described size after carrier wave finishes polymerization in described base station, described method also comprises:
Described base station judges whether the described carrier wave of selecting satisfies the bandwidth ability of described user terminal;
In judged result is under the situation that is, the described carrier wave that described base station will be selected carries out aggregation processing.
5. method according to claim 4 is characterized in that, after described base station judged whether the described carrier wave of selecting satisfies the bandwidth ability of described user terminal, described method also comprised:
In judged result is that new carrier wave is selected in described base station under the situation not from have neither part nor lot in described prepolymerized other carrier waves;
If the described new carrier wave of selecting and participate in the bandwidth ability that described prepolymerized part carrier wave carries out satisfying after the polymerization described user terminal, described new carrier wave and the described part that then will select are carried out aggregation processing;
Otherwise described base station discharges has selected to carry out prepolymerized described composition carrier wave, and is having neither part nor lot in the new resource of selection on described prepolymerized other carrier waves.
6. a carrier wave choice device is characterized in that, comprising:
Determination module is used for determining carrier aggregation information that wherein, described carrier aggregation information comprises: the prepolymerized new set number of size, the bandwidth ability of user terminal, carrier wave that can participate in the prepolymerized carrier wave of carrier wave;
First selects module, is used for selecting to form carrier wave formation carrier set according to area interference situation and the definite described size of described determination module from the prepolymerized new set number of described carrier wave, finishes prepolymerization;
The polymerization module, the described size that is used for determining according to the bandwidth ability and the described determination module of described user terminal selects carrier wave to finish polymerization from the described prepolymerized described carrier set of described first participation of selecting module to select.
7. device according to claim 6 is characterized in that, described determination module comprises:
First determines submodule, is used for determining according to the bandwidth ability of the bandwidth types of all supports and described user terminal the size of the prepolymerized carrier wave of described participation carrier wave.
8. device according to claim 6 is characterized in that, described determination module comprises:
Second determines submodule, is used for determining the prepolymerized new set number of described carrier wave according to the bandwidth ability of described user terminal.
9. according to each described device in the claim 6 to 8, it is characterized in that, also comprise:
Judge module is used to judge whether the described carrier wave of described polymerization module selection satisfies the bandwidth ability of described user terminal;
Processing module, the judged result that is used at described judge module is under the situation that is, the described carrier wave that described polymerization module is selected carries out aggregation processing.
10. device according to claim 9 is characterized in that, also comprises:
Second selects module, and the judged result that is used at described judge module is under the situation not, selects new carrier wave from have neither part nor lot in described prepolymerized other carrier waves;
Described processing module also is used for selecting the described new carrier wave that module selects and participating in satisfying after described prepolymerized part carrier wave carries out polymerization under the situation of bandwidth ability of described user terminal described second, and described second described new carrier wave and the described part of selecting module to select carried out aggregation processing;
Release module, be used for selecting the described new carrier wave that module selects and participating in not satisfying after described prepolymerized part carrier wave carries out polymerization under the situation of bandwidth ability of described user terminal, discharge and selected to carry out prepolymerized described composition carrier wave described second;
The 3rd selects module, be used for selecting the described new carrier wave that module selects and participating in not satisfying after described prepolymerized part carrier wave carries out polymerization under the situation of bandwidth ability of described user terminal, having neither part nor lot in the new resource of selection on described prepolymerized other carrier waves described second.
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| CN2009101675145A CN101998645A (en) | 2009-08-19 | 2009-08-19 | Carrier selection method and device |
| PCT/CN2010/072693 WO2011020345A1 (en) | 2009-08-19 | 2010-05-12 | Method and device for selecting carriers |
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| CN2009101675145A CN101998645A (en) | 2009-08-19 | 2009-08-19 | Carrier selection method and device |
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| CN109792638B (en) * | 2016-09-29 | 2024-04-30 | 株式会社Ntt都科摩 | Terminal, base station, system and communication method |
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| WO2011020345A1 (en) | 2011-02-24 |
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