CN109479200A

CN109479200A - A kind of data transmission method and base station

Info

Publication number: CN109479200A
Application number: CN201680087853.0A
Authority: CN
Inventors: 甘久斌; 李汉涛; 李振宇; 任占阳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-08-19
Filing date: 2016-08-19
Publication date: 2019-03-15
Also published as: WO2018032504A1

Abstract

The embodiment of the invention discloses a kind of data transmission method and base stations, wherein this method comprises: main website sends signal in first community using narrowband coverage enhancement technology；Main website access terminal in the first community；First data to be transmitted is sent to the first extension station by the main website, so that first data to be transmitted is transferred to the terminal by first extension station.The embodiment of the present invention enables to main website and extension station effectively to cooperate with, and achievees the purpose that promote operator's in-door covering and capacity, meanwhile, promote the service rate of terminal.

Description

A kind of data transmission method and base station

Technical field

The present invention relates to field of communication technology more particularly to a kind of data transmission method and base stations.

Background technique

With the sharp increase of message volume, third generation partner program (3rd Generation Partnership Project, 3GPP) authorization frequency spectrum seems less and less adequate to provide higher network capacity.Since unlicensed spectrum resource is greater than authorization frequency spectrum resource, in order to efficiently use unlicensed spectrum resource, two schemes are provided in the prior art, the first scheme: carrier wave is polymerize (Carrier Aggregation, CA) technical application assists in access (Licensed Assisted Access, LAA) in authorization；Second scheme: dual link (Dual Connectivity, DC) technology is used.Authorization frequency spectrum resource and unlicensed spectrum resource can be comprehensively utilized using above-mentioned CA technology or DC technology.

According to statistics, the main business of mobile broadband network occurs indoors, and for indoor business accounting close to 70%, the effect for promoting in-door covering is the key that operator keeps user here.There are the following two kinds scenes for discovery in practice, the first is: operator A has main website in outdoor deployment, operator A is also deployed with extension station indoors, second is: operator A has main website in outdoor deployment, operator B or enterprise are deployed with extension station indoors, and operator A and operator B can share indoor extension station.Wherein, main website uses unlicensed spectrum resource using authorization frequency spectrum resource, extension station.

For above two scene, since the penetration capacity of outdoor main website indoors is very weak, outdoor main website can not cover signal to interior, indoor terminal can not just receive the signal of outdoor main website and indoor extension station simultaneously, be not available CA technology at present or DC technology cooperates with outdoor main website and indoor extension station effectively.

Summary of the invention

The embodiment of the invention discloses a kind of data transmission method and base stations, and main website and extension station is enabled to effectively to cooperate with, and achieve the purpose that promote operator's covering and capacity, meanwhile, promote the service rate of terminal.

The embodiment of the invention discloses a kind of data transmission methods, applied in the communication system including main website and at least one extension station, comprising:

Main website sends signal in first community using narrowband coverage enhancement technology；Main website access terminal in the first community；First data to be transmitted is sent to the first extension station by the main website, so that first data to be transmitted is transferred to the terminal by first extension station, wherein first extension station and the first community have common overlay area.

Wherein, narrowband coverage enhancement technology is one of coverage enhancement technology, optionally, main website can also be covered signal to interior using other coverage enhancement technologies, such as: use more low-frequency carrier wave, or preferable wireless communications method is covered using other, such as global system for mobile communications (Global System for Mobile Communication, GSM), Universal Mobile Communication System (Universal Mobile Telecommunications System, UMTS) etc..Wherein, main website is properly termed as macro station (Macro cell), and the first extension station is properly termed as small station (Small Cell).Main website is generally operational in licensed spectrum, and the first extension station, which is generally operational in, exempts from licensed spectrum.First community is the cell in main website coverage area.

It can be seen that, main website can send signal in first community using narrowband coverage enhancement technology, in this way, main website can assist extension station, terminal is allowed to be linked into the first community of main website, further, the first data to be transmitted is sent to the first extension station by main website, and the first data to be transmitted can be transferred to terminal by the first extension station, so that main website and extension station effectively cooperate with, achieve the purpose that promote operator's covering and capacity, meanwhile, promote the service rate of indoor terminal.

In a possible embodiment, the narrowband coverage enhancement technology includes the machine type communication eMTC or narrowband Internet of Things NB-IoT of enhancing.

In a possible embodiment, the main website polymerize CA technology using carrier wave with first extension station, and the first data to be transmitted is sent to the first extension station and includes: by the main website

First data to be transmitted is sent to the first extension station on media access control MAC layer by the main website.

In the optional embodiment, communication system polymerize (Carrier Aggregation using carrier wave, CA) technology, the licensed spectrum of main website and the licensed spectrum of exempting from of the first extension station can be condensed together, alternatively, the license frequency point of main website and the license frequency point of the first extension station can be condensed together.It is ideal passback (the phenomenon that there is no packet loss or time delays when carrying out data transmission between main website and the first extension station) in this mode, between main website and the first extension station, the data distribution anchor point of main website and the first extension station is in media access control (Media Access Control, MAC) layer, realizes data distribution by the dynamic dispatching of the MAC layer of CA.

In a possible embodiment, the main website and first extension station use dual link DC technology, and the first data to be transmitted is sent to the first extension station and includes: by the main website

First data to be transmitted is sent to the first extension station on PDCP layers of Packet Data Convergence Protocol by the main website.

In the optional embodiment, communication system uses dual link (Dual Connectivity, DC) technology, terminal is connected to the connected base station of non-ideal passback (the phenomenon that there are packet loss or time delays when carrying out data transmission between base station) simultaneously and carries out data communication, for example terminal is connected to main website and the first extension station simultaneously.In this case, for the data distribution anchor point of main website and the first extension station in Packet Data Convergence Protocol (Packet Data Convergence Protocol, PDCP) layer of main website, main website carries out data distribution on PDCP layers.

In a possible embodiment, the main website is used for the terminal authentication, and transmits the control signaling of the terminal.Wherein, indoor extension station is only responsible for the transmission of data, in addition, outdoor main website can also carry out the transmission of data.

In a possible embodiment, the main website is in the first community after access terminal, the method also includes:

The main website sends frequency point measurement request to the terminal；The main website receives the first frequency point measurement result that the terminal reports；The main website selects first extension station according to the first frequency point measurement result from least one described extension station.

In the optional embodiment, main website can the preferable extension station of selection signal quality be as the first extension station from multiple extension stations, to improve the service rate of terminal.

In a possible embodiment, the method also includes:

The main website selects the second extension station from least one described extension station according to the second frequency point measurement result that the terminal is sent；

Second data to be transmitted is sent to second extension station by the main website, is transferred to the terminal to trigger second extension station for second data to be transmitted.

Specifically, in the optional embodiment, in the case where terminal is moved to the region without the covering of the first extension station, or, in the case where the terminal is moved to the region of the second extension station covering, main website can select the second extension station according to the second frequency point measurement result that terminal is sent from least one extension station, and the second data to be transmitted is then sent to the second extension station again, and the second data to be transmitted is transferred to terminal to trigger the second extension station.Wherein, in the case where the terminal is moved to the region of the second extension station covering, if main website can determine that terminal is higher than the signal strength received in the region that the first extension station covers in the signal strength that the region that the second extension station covers receives according to the second frequency point measurement result that terminal is sent, main website can select the second extension station from least one extension station.

Wherein, for extension station, each of at least one extension station, main website can indicate signal transmission power and clear channel assessment (CCA) CCA threshold value used by each extension station (such as the first extension station, the second extension station), to carry out interference coordination control.

As it can be seen that main website can carry out the switching of extension station in the case where terminal is mobile, it can be ensured that terminal receives that signal is stronger, promotes the service rate of terminal.

In a possible embodiment, the method also includes:

The main website carries out interference coordination control at least one described extension station.

In a possible embodiment, the main website includes: to the progress interference coordination control of at least one described extension station

The main website indicates signal transmission power and clear channel assessment (CCA) CCA threshold value used by each described extension station to extension station, each of at least one extension station, wherein, to any two extension station at least one described extension station, third extension station and the 4th extension station, if the signal strength that the terminal in third extension station coverage area receives is higher than the signal strength that the terminal in the 4th extension station coverage area receives, the signal transmission power that the third extension station uses is less than the signal transmission power that the 4th extension station uses, the CCA threshold value that the third extension station uses is greater than the CCA threshold value that the 4th extension station uses.

Wherein, for each extension station, the signal that the terminal in the extension station coverage area receives is stronger, then the main website indicates signal transmission power that the extension station uses with regard to smaller, and CCA threshold value is bigger；The signal that terminal in the extension station coverage area receives is weaker, then the signal transmission power that the main website indicates that the extension station uses is bigger, and CCA threshold value is smaller.

Second aspect of the embodiment of the present invention discloses a kind of base station, and the base station is main website, comprising:

First transmission unit, for sending signal in first community using narrowband coverage enhancement technology；

Access unit, for the access terminal in the first community；

Second transmission unit, for the first data to be transmitted to be sent to the first extension station, so that first data to be transmitted is transferred to the terminal by first extension station, wherein first extension station and the first community have common overlay area.

In a possible embodiment, the main website polymerize CA technology using carrier wave with first extension station, and the first data to be transmitted is sent to the mode of the first extension station by second transmission unit specifically:

The first data to be transmitted is sent to the first extension station on media access control MAC layer.

In a possible embodiment, the main website and first extension station use dual link DC technology, and the first data to be transmitted is sent to the mode of the first extension station by second transmission unit specifically:

The first data to be transmitted is sent to the first extension station at PDCP layers of Packet Data Convergence Protocol.

In a possible embodiment, the main website is used for the terminal authentication, and transmits the control signaling of the terminal.

In a possible embodiment, first transmission unit is also used to the access unit in the first community after access terminal, and Xiang Suoshu terminal sends frequency point measurement request；

The base station further include:

Receiving unit, the first frequency point measurement result reported for receiving the terminal；

Selecting unit, for selecting first extension station from least one described extension station according to the first frequency point measurement result.

In a possible embodiment, the selecting unit is also used to select the second extension station from least one described extension station according to the second frequency point measurement result that the terminal is sent；

Second transmission unit is also used to for the second data to be transmitted to be sent to second extension station, is transferred to the terminal to trigger second extension station for second data to be transmitted.

In a possible embodiment, the base station further include:

Control unit, for carrying out interference coordination control at least one described extension station.

In a possible embodiment, described control unit carries out the mode of interference coordination control at least one described extension station specifically:

As it can be seen that the base station enables to main website and extension station effectively to cooperate with when executing some or all of first aspect either method step, achieve the purpose that promote operator's covering and capacity, meanwhile, promote the service rate of terminal.

The third aspect of the embodiment of the present invention discloses a kind of base station, the base station includes: processor, receiver, transmitter and memory, the memory is configured for store instruction, the processor is configured for operation described instruction, and the processor operation described instruction is to execute some or all of first aspect either method of embodiment of the present invention step.Wherein, it enables to main website and extension station effectively to cooperate with when which executes some or all of first aspect either method step, achievees the purpose that promote operator's covering and capacity, meanwhile, promote the service rate of terminal.

Fourth aspect of the embodiment of the present invention discloses a kind of computer storage medium, and the computer storage medium is stored with program, and described program specifically includes the instruction for executing some or all of first aspect either method of embodiment of the present invention step.

It should be noted that, method described in the present invention is suitable for the scene of outdoor main website and indoor extension station, optionally, the method of description of the present invention is equally applicable to outdoor scene proximally and distally, wherein, outdoor proximal end can regard indoor extension station in the present invention as, and outdoor distal end can regard main website outdoor in the present invention as.

It should be noted that the above method is suitable for downlink data transmission flow, optionally, the above method is equally applicable to upstream data transmission flow, and details are not described herein.

Detailed description of the invention

To describe the technical solutions in the embodiments of the present invention more clearly, the drawings to be used in the embodiments are briefly described below, apparently, drawings in the following description are only some embodiments of the invention, for those of ordinary skill in the art, without any creative labor, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is a kind of network architecture schematic diagram of communication system disclosed by the embodiments of the present invention；

Fig. 1 .1 is a kind of base station deployment schematic diagram of a scenario disclosed by the embodiments of the present invention；

Fig. 1 .2 is another base station deployment schematic diagram of a scenario disclosed by the embodiments of the present invention；

Fig. 2 is a kind of flow diagram of data transmission method disclosed by the embodiments of the present invention；

Fig. 3 is the flow diagram of another data transmission method disclosed by the embodiments of the present invention；

Fig. 4 is the flow diagram of another data transmission method disclosed by the embodiments of the present invention；

Fig. 5 is a kind of structural schematic diagram of base station disclosed by the embodiments of the present invention；

Fig. 6 is the structural schematic diagram of another base station disclosed by the embodiments of the present invention；

Fig. 7 is the structural schematic diagram of another base station disclosed by the embodiments of the present invention；

Fig. 8 is a kind of structural schematic diagram of communication system disclosed by the embodiments of the present invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical scheme in the embodiment of the invention is clearly and completely described, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, shall fall within the protection scope of the present invention.

Term " first " in description and claims of this specification and above-mentioned attached drawing and " second ", etc. be to be not use to describe a particular order for distinguishing different objects.In addition, term " includes " and " having " and their any deformations, it is intended that cover and non-exclusive include.Such as contain the process, method, system, product or equipment of a series of steps or units and be not limited to listed step or unit, but optionally further comprising the step of not listing or unit, or optionally further comprising for these process, methods, The other step or units of product or equipment inherently.

The embodiment of the invention discloses a kind of data transmission method and base stations, and outdoor main website and indoor extension station is enabled to effectively to cooperate with, and achieve the purpose that promote operator's in-door covering and capacity, meanwhile, promote the service rate of indoor terminal.It is described in detail separately below.

In order to be best understood from a kind of data transmission method disclosed by the embodiments of the present invention, the network architecture being first applicable in below the embodiment of the present invention is described.

Referring to Figure 1, Fig. 1 is a kind of network architecture schematic diagram of communication system disclosed by the embodiments of the present invention, wherein the network architecture shown in FIG. 1 is outdoor using main website and the indoor group-network construction for using extension station.The network architecture shown in FIG. 1 can be adapted for long term evolution (Long-term Evolution, LTE) system or Long Term Evolution upgrade (Long-term Evolution Advanced, LTE-A) in system, it is particularly suitable for the LTE system of licensed spectrum auxiliary access, that is auxiliary authorization access long term evolution (License Assisted Access Long-term Evolution, LAA-LTE) system.

Wherein, LAA-LTE system refers to licensed spectrum and exempts from the LTE system that licensed spectrum used together by the mode that carrier wave polymerize (Carrier Aggregation, CA) or non-CA.Wherein, the mode of non-CA for dual link (Dual connectivity, DC) or can exempt from licensed spectrum and independently use (Unlicensed Standalone).

Specifically, can have following 2 kinds of networking scenes.The first networking scene is by licensed spectrum and to be exempted from licensed spectrum using CA technology and condensed together, the carrier wave for including using licensed spectrum or licensed spectrum or the cell to work in licensed spectrum are as main serving cell, it will exempt from licensed spectrum or exempt from carrier wave that licensed spectrum includes or work is exempting from the cell in licensed spectrum as auxiliary serving cell, wherein, main serving cell and auxiliary serving cell can be disposed with co-sited (main website or indoor extension station i.e. outside coenecium), it is also possible to non-co-sited deployment, there is ideal or nonideal return path between two serving cells, wherein, ideal return path refers to the phenomenon that packet loss or time delay is not present when transmitting data between two serving cells, nonideal return path refers to the phenomenon that there are packet loss or time delays when transmitting data between two serving cells.

Second of networking scene is the scene exempted from licensed spectrum and independently use (Unlicensed Standalone), it will exempt from the scene that licensed spectrum works as Independent Carrier Wave, independent access function can be provided exempting from the serving cell in licensed spectrum, the auxiliary by work cell in licensed spectrum is not needed, so that it may access The corresponding cell of unlicensed frequency spectrum.Wherein, licensed spectrum namely authorization frequency spectrum, unlicensed frequency spectrum namely unlicensed spectrum.

It should be noted that, the system that the present invention is applicable in is not limited to LTE/LTE-A system, it can be applicable in Wireless Fidelity WiFi, worldwide interoperability for microwave accesses (Worldwide Interoperability for Microwave Access, WiMax), Wideband-CDMA (Wide band Code Division Multiple Acess, WCDMA), CDMA (Time Division-Synchronous Code Division Multiple Access, TDSCDMA), the global system for mobile communications (Global of time division synchronous System for Mobile Communication, GSM), purple honeybee Zigbee, the wireless communication systems such as bluetooth.

As shown in Figure 1, the system architecture includes: main website, at least one extension station and at least one terminal, wired connection can be passed through between main website and extension station, or pass through wireless connection, it can be ideal passback (ideal backhaul) or non-ideal passback (Non-ideal backhaul) between main website and extension station, wherein, main website is properly termed as macro station (Macro cell), and extension station is properly termed as small station (Small Cell).

Main website is located at roof and steel tower equal-height position, beam coverage is big, can generally achieve several kilometers, but because being influenced by building, trees, the coverage effect of main website is uneven, and there are a large amount of blind areas generally by operator deployment in outdoor.Frequency range Yue Gao main website is weaker to indoor penetration capacity.Main website is generally operational in licensed spectrum.

Extension station can also be disposed indoors by operator deployment indoors by enterprise.In general, extension station is the base station equipment of a kind of low transmitting power, small range covering, work in unauthorized frequency spectrum, transmission power covers the range of 10~200m, extension station, which is generally operational in, exempts from licensed spectrum between 100mW to 5W.

In the present invention, mainly for two kinds of deployment scenarios.

Please also refer to Fig. 1 .1, Fig. 1 .1 is a kind of base station deployment schematic diagram of a scenario disclosed by the embodiments of the present invention.As shown in Fig. 1 .1, operator A has main website in outdoor deployment, and operator A is also deployed with extension station indoors.The main website of operator A sends signal in first community using narrowband coverage enhancement technology, assist indoor extension station, the terminal of operator A is allowed to access in first community, further, data from core net A through operator A main website when, the main website of operator A shunts data, and a part of data flow to the terminal of operator A from the main website for the operator A for supporting licensed spectrum, and the extension station for the operator A that another part data exempt from licensed spectrum from support flows to the terminal of operator A.

Wherein, it can be ideal passback between the main website of operator A and the extension station of operator A, be also possible to non-ideal passback, the extension station of operator A, which can be, exempts from the extension station that licensed spectrum independently uses, and is also possible to the extension station of LAA.Wherein, ideal passback refer to when transmitting data between main website and extension station there is no packet loss perhaps time delay the phenomenon that non-ideal passback refer to data are transmitted between main website and extension station when there are packet loss or time delays the phenomenon that.

It can be seen that, under this base station deployment scene described in Fig. 1 .1, the main website and extension station of same operator can be cooperateed with effectively, main website narrows the bandwidth of signal by using narrowband coverage enhancement technology, the transmission power of signal is improved to realize terminal in Master station access, while main website shunts the data distribution for needing to be transferred to indoor terminal to the indoor extension station for having unauthorized frequency range ability, to achieve the purpose that promotion operator's in-door covering and capacity, meanwhile promoting indoor terminal service rate.

Please also refer to Fig. 1 .2, Fig. 1 .2 is another base station deployment schematic diagram of a scenario disclosed by the embodiments of the present invention.As are shown in figure 1.2, operator A has main website in outdoor deployment, and operator A is deployed with neutral node (i.e. extension station) indoors, and operator B only has main website in outdoor deployment, indoors without deployment extension station.Wherein, the coordination approach of the main website for operator A and the extension station of operator A is identical as described in Fig. 1 .1, and details are not described herein, specifically the description of .1 referring to Figure 1.

Wherein, the main website of operator B sends signal in first community using narrowband coverage enhancement technology, assist indoor extension station, the terminal of operator B is allowed to access in first community, further, data from core net B through operator B main website when, the main website of operator B can be shunted by sharing the extension station of operator A, a part of data flow to the terminal of operator B from the main website for the operator B for supporting licensed spectrum, and the extension station for the operator A that another part data exempt from licensed spectrum from support flows to the terminal of operator B.

Wherein, it can be ideal passback between the main website of operator A and the extension station of operator A, be also possible to non-ideal passback, the extension station of operator A, which can be, exempts from the extension station that licensed spectrum independently uses, and is also possible to the extension station of LAA；It can be ideal passback between the main website of operator B and the extension station of operator B, be also possible to non-ideal passback, the extension station of operator B, which can be, exempts from the extension station that licensed spectrum independently uses, and is also possible to the extension station of LAA

As it can be seen that under this base station deployment scene described in Fig. 1 .2, can share between multiple operators to exempting from licensed spectrum, no in-door covering can operator can be sent using coverage enhancement technology in first community After signal, there is the extension station of in-door covering operator to be shunted by renting, so that indoor main website and indoor extension station effectively cooperate with, achievees the purpose that promote operator's in-door covering and capacity, meanwhile, promote indoor terminal service rate.

Wherein, for the scene of Fig. 1 .1 and Fig. 1 .2, the main website of operator can carry out data distribution by two ways, the first: communication system polymerize CA technology using carrier wave, and data to be transmitted is sent to extension station on media access control MAC layer by main website；Second: communication system uses dual link DC technology, and data to be transmitted is sent to extension station on PDCP layers of Packet Data Convergence Protocol by main website.

In addition, it is optional, data distribution can also be carried out by core net, specifically, core net and main website establish the first carrying, core net and extension station and establish the second carrying, and core net carries to terminal by first and sends the first data, and core net carries to terminal by second and sends the second data.

Wherein, main website is mainly used for the management of control plane, such as access, certification and authentication, and extension station is mainly used for the data transmission of data surface, in addition, main website can be used for data transmission.In general, using unlicensed spectrum in extension station using frequency spectrum is authorized in main website.Wherein, narrowband coverage enhancement technology may include machine type communication (the enhanced Machine Type Communications of enhancing, eMTC :) or narrowband Internet of Things (Narrow Band-Internet of Things, NB-IoT) etc..

It should be noted that method described in the embodiment of the present invention is equally applicable to outdoor scene proximally and distally, outdoor proximal end can regard indoor extension station in the present invention as, and outdoor distal end can regard main website outdoor in the present invention as.

Fig. 2 is referred to, Fig. 2 is a kind of flow diagram of data transmission method disclosed by the embodiments of the present invention.Wherein, which write from more sides such as main website, extension station and terminal, and this method is suitable for scene described in Fig. 1 .1 and Fig. 1 .2, method includes the following steps:

201, main website sends signal in first community using narrowband coverage enhancement technology.

In the embodiment of the present invention, which can be operator deployment in outdoor base station.In general, it is weaker that the network of main website is difficult to squeeze into the network coverage of indoor or main website indoors, in order to solve this problem, in the embodiment of the present invention, main website can send signal in first community using narrowband coverage enhancement technology, wherein, which may include machine type communication (the enhanced Machine Type of enhancing Communications, eMTC) or narrowband Internet of Things (Narrow Band-Internet of Things, NB-IoT) etc., which is the cell in main website coverage area.

Specifically, main website can send the common signal carried on common signal channel in first community using narrowband coverage enhancement technology.The common signal can include but is not limited to primary synchronization signal (Primary Synchronization Signal, PSS), secondary synchronization signal (Secondary Synchronization Signal, SSS), physical broadcast signal (Physical Broadcast Channel, PBCH), broadcast singal (Master Information Block, MIB).

It should be noted that, in the embodiment of the present invention, optionally, main website can also use other coverage enhancement technologies that signal is squeezed into interior, such as: use the carrier wave of more low frequency (such as 900MHz), or preferable wireless communications method (such as global system for mobile communications (Global System for Mobile Communication is covered using other, GSM), Universal Mobile Communication System (Universal Mobile Telecommunications System, UMTS) etc..

202, terminal is linked into first community.

In the embodiment of the present invention, indoor extension station does not have access function, and outdoor main website is narrowed the bandwidth of signal using narrowband coverage enhancement technology, improves the transmission power of signal to realize terminal in Master station access.

Wherein, main website also needs to authenticate to positioned at indoor terminal, and should be located at indoor terminal be the terminal for needing to access in the corresponding cell of main website.After the authentication is passed, i.e., after the identity of indoor terminal is legal, main website can carry out charging to the terminal.

203, main website sends frequency point measurement request to terminal.

In the embodiment of the present invention, terminal indoors is linked into after the corresponding cell of main website, main website can send frequency point measurement request to terminal, wherein, frequency point measurement request measures on the frequency point for requesting terminal, and frequency point measurement request may include at least one frequency point where indoor extension station, it can be unauthorized frequency point, it is also possible to authorize frequency point, wherein unauthorized frequency point such as 2.4GHz, 5.8GHz etc..

204, terminal sends the first frequency point measurement result to main website.

In the embodiment of the present invention, terminal receives after the frequency point measurement request of main website transmission, terminal can extract the frequency point in frequency point measurement request, and it is measured on the frequency point, obtain the first frequency point measurement result, in general, the first frequency point measurement result may include the mark (cell ID) of cell, reference signal receives function Rate (Reference Signal Receiving Power, RSRP), Reference Signal Received Quality (Reference Signal Receiving Quality, RSRQ), wherein, the mark of each cell can correspond to an extension station, and the value range of RSRP is -44~-140dBm, the value range of RSRQ: the value of -3~-19.5, RSRP and RSRQ shows that more greatly the signal received is stronger.

205, main website selects the first extension station according to the first frequency point measurement result from least one extension station.

In the embodiment of the present invention, main website receives after the first frequency point measurement result of terminal transmission, main website can determine multiple extension stations by the mark of at least one cell in the first frequency point measurement result, it is possible to further which the strongest extension station of signal is determined as the first extension station from least one extension station according to signal strength or weakness.Wherein, the first extension station and first community have common overlay area.

206, the first data to be transmitted is sent to the first extension station by main website.

In the embodiment of the present invention, main website is according to the first frequency point measurement result after selecting the first extension station in multiple extension stations, further, main website can also determine distributing strategy according to service quality (Quality of Service, QoS) demand of own load levels and business.Such as: own load levels are higher than heavier or business QoS demand, then can be by more data distribution to the first extension station.Wherein, which is the data that current master station needs to be transmitted to indoor terminal, predominantly business datum.

As an alternative embodiment, main website polymerize CA technology using carrier wave with the first extension station, the first data to be transmitted is sent to the mode of the first extension station by main website specifically:

First data to be transmitted is sent to the first extension station in media access control MAC by main website.

The phenomenon that being ideal passback (Back Haul, BH) in the optional embodiment, between main website and the first extension station, i.e., packet loss or time delay are not present when carrying out data transmission between main website and the first extension station.The data distribution anchor point of main website and the first extension station realizes data distribution by the dynamic dispatching of the MAC layer of CA in media access control (Media Access Control, MAC) layer.

Wherein, main website polymerize (Carrier Aggregation using carrier wave with first extension station, CA) technology, the licensed spectrum of main website and the licensed spectrum of exempting from of the first extension station can be condensed together, alternatively, the license frequency point of main website and the license frequency point of the first extension station can be condensed together.In LTE system, LTE equipment can be by way of CA, using licensed spectrum as main member carrier (Primary Component Carrier, PCC) or main plot (Primary Cell, PCell), licensed spectrum will be exempted to carry as auxiliary member Wave (Secondary Component Carrier,) or secondary cell (Secondary Cell SCC, SCell), LTE equipment can both inherit traditional advantage of the LTE equipment for wireless communication by licensed spectrum in this way, such as in mobility, safety, service quality and simultaneously handle advantage in terms of multi-subscriber dispatching, and can use the frequency spectrum resource for exempting from licensed spectrum.

As another optional embodiment, main website and the first extension station use dual link DC technology, and the first data to be transmitted is sent to the mode of the first extension station by main website specifically:

First data to be transmitted is sent to the first extension station in Packet Data Convergence Protocol PDCP by main website.

It is non-ideal passback (BackHaul, BH) in the optional embodiment, between main website and the first extension station, i.e., the phenomenon that there are packet loss or time delays when carrying out data transmission between main website and the first extension station.The data distribution anchor point of main website and the first extension station realizes data distribution by the PDCP layer of DC in Packet Data Convergence Protocol (Packet Data Convergence Protocol, PDCP) layer of main website.

Wherein, dual link (Dual Connectivity, it DC is) UE in wireless heterogeneous networks connection (Radio Resource Control CONNECTED, RRC_CONNECTED) the one mode under state, it is configured with a main plot group (Master Cell Group,) and a secondary cell group (Secondary Cell Group, SCG) MCG.If accessing net (Evolved Universal Terrestrial Radio Access Network, E-UTRAN DC) is supported, the UE of RRC_CONNECTED state is configurable to the radio resource provided using two different base station eNB, two eNB are connected by X2 interface, one is used as main website MeNB, and one is used as extension station SeNB.In DC, UE is connected with MeNB and SeNB respectively.

207, the first data to be transmitted is transferred to terminal by the first extension station.

As another optional embodiment, main website also can indicate that the first extension station using the first signal transmission power and the first clear channel assessment (CCA) CCA threshold value, first extension station receives after first signal transmission power and the first clear channel assessment (CCA) CCA threshold value, first data to be transmitted can be sent to according to the first signal transmission power according to the first clear channel assessment (CCA) CCA threshold value when channel idle and be transferred to terminal by the first extension station.Interference coordination control is carried out at least one indoor extension station in this way, being conducive to main website.

In the method flow described in Fig. 2, main website can send signal in first community using narrowband coverage enhancement technology allows terminal to be linked into the corresponding first community of main website in this way, main website can assist extension station, Further, the first data to be transmitted is sent to the first extension station by main website, and the first data to be transmitted can be transferred to terminal by the first extension station, so that main website and extension station effectively cooperate with, achieve the purpose that promote operator's covering and capacity, meanwhile, promote the service rate of terminal.

Fig. 3 is referred to, Fig. 3 is the flow diagram of another data transmission method disclosed by the embodiments of the present invention.Wherein, which write from more sides such as main website, extension station and terminal, and this method is suitable for scene described in Fig. 1 .1 and Fig. 1 .2.Method includes the following steps:

301, the first data to be transmitted is sent to the first extension station by main website, and indicates that the first extension station uses the first signal transmission power and the first clear channel assessment (CCA) CCA threshold value.

In the embodiment of the present invention, the power that indoor each terminal receives extension station signal is can be monitored in real time in main website, meanwhile, indoor terminal can also receive the power of extension station signal with real-time report itself.Main website can concentrate ad hoc network (Self-Organizing Network) ability, signal transmission power and clear channel assessment (CCA) (Clear Channel Assessment used by being located at least one indoor extension station are indicated according to the power of extension station signal is received positioned at indoor each terminal, CCA) threshold value, in this way, main website can interference coordination control between the indoor multiple extension stations of progress of macroscopic view.

In the embodiment of the present invention, for main website and indoor different extension station, main website must can be with stand-alone service terminal, therefore main website has all LTE channel functions, and extension station can only have partial function, correspond to different protocol versions.It is as shown in the table:

Wherein, R13/ R14/ R14+ is the protocol version that extension station supports, primary synchronization signal (Primary Synchronization Signal, PSS), secondary synchronization signal (Secondary Synchronization Signal, SSS), paging message Paging, system message System Info, random accessing message RA, radio resource control signaling (Radio Resource Control, RRC), Physical Downlink Control Channel (Physical Downlink Control Channel, PDCCH), Physical Downlink Shared Channel (Physical D Ownlink Shared Channel, PDSCH), physical uplink control channel (Physical Uplink Control Channel, PUCCH), Physical Uplink Shared Channel (Physical Uplink Shared Channel, PUSCH), Physical Control Format Indicator Channel (Physical Control Format Indicator Channel, PCFICH), Physical HARQ Indicator Channel (Physical Hybrid-ARQ Indicator Channel, PHICH).

Wherein, have all channels, signal, message and signaling in main website, support the extension station of diversity of protocol versions that the relevant technologies mentioned in the present invention can be used.Wherein, it supports the extension station of R13 agreement to have 2 channels, i.e. PDCCH and a PDSCH, the extension station of R14 agreement is supported to have 3 channels, i.e. PDCCH, PDSCH and PUSCH, support that the extension station of R14+ agreement has 5 channels, i.e. PDCCH, PDSCH, PUCCH, PUSCH, PCFICH/PHICH, unauthorized independence have all channels using the extension station of cell.

302, the first data to be transmitted is transferred to terminal using the first signal transmission power and the first clear channel assessment (CCA) CCA threshold value by the first extension station.

In the embodiment of the present invention, the first extension station first can determine whether current channel is idle according to the first clear channel assessment (CCA) CCA threshold value, if idle, the first data to be transmitted can be transferred to terminal with the first signal transmission power by the first extension station.In this way, being conducive to the interference coordination control between each extension station.

303, in the case where terminal is moved to the region without the covering of the first extension station, main website moves towards the data distribution of terminal to be switched to main website from the first extension station.

In the embodiment of the present invention, the power that terminal in terminal moving process receives the signal of extension station is can be monitored in real time in main website, meanwhile, for terminal in moving process, terminal can also receive the power of the signal of extension station to main website reporting terminal in real time.In the case where terminal is moved to the region without the covering of the first extension station namely terminal be currently received the first extension station signal it is very weak, at this point, main website needs to change the data distribution trend of terminal, the data distribution of terminal can be moved towards from the first extension station be switched to main website.

304, terminal sends the second frequency point measurement result to main website.

In the embodiment of the present invention, terminal is accessed after the corresponding cell of main website, and main website can send frequency point measurement request to terminal in real time, frequency point measurement is carried out with requesting terminal, and reports frequency point measurement result, or, optionally, terminal can be measured with real-time perfoming frequency point, and active reporting frequency point measurement result.

Wherein, in embodiments of the present invention, the second frequency point measurement result is different from the first frequency point measurement result above, the second frequency point measurement result is in the case where terminal is moved to the region of no extension station covering, the frequency point measurement result that main website receives, the second frequency point measurement result may include the mark of cell, the power of signal on each frequency point.Wherein, the mark of each cell can correspond to an extension station.

305, main website selects the second extension station according to the second frequency point measurement result that terminal is sent from least one extension station.

In the embodiment of the present invention, main website can determine multiple extension stations by the mark of multiple cells in the second frequency point measurement result according to main website, it is possible to further which the strongest extension station of signal is determined as the second extension station from least one extension station according to signal strength or weakness.

306, the second data to be transmitted is sent to the second extension station by main website, and indicates that the second extension station uses second signal transmission power and the second clear channel assessment (CCA) CCA threshold value.

Wherein, which is currently to need to be transferred to the data of terminal, which is different from the first data to be transmitted.

Wherein, for each extension station, the signal that the terminal in extension station coverage area receives is stronger, then for the signal transmission power that main website instruction extension station uses with regard to smaller, CCA threshold value is bigger；The signal that terminal in extension station coverage area receives is weaker, then the signal transmission power that main website instruction extension station uses is bigger, and CCA threshold value is smaller.

For example, for the first extension station and the second extension station, if the signal strength that the terminal in first extension station coverage area receives is higher than the signal strength that the terminal in second extension station coverage area receives, the first signal transmission power that first extension station uses is less than the second signal transmission power that second extension station uses, and the first CCA threshold value that first extension station uses is greater than the 2nd CCA threshold value that second extension station uses.

307, the second data to be transmitted is transferred to terminal using second signal transmission power and the second clear channel assessment (CCA) CCA threshold value by the second extension station.

In the embodiment of the present invention, the signal transmission power of main website instruction and the transmission of CCA threshold value progress data is respectively adopted in first extension station and the second extension station, main website may be implemented in this way to control the interference coordination multiple extension stations, simultaneously, in the case where terminal is moved to the region of no extension station covering, the switching of progress extension station, main website, it can be ensured that indoor terminal receives that signal is stronger, promotes the service rate of indoor terminal.

Fig. 4 is referred to, Fig. 4 is the flow diagram of another data transmission method disclosed by the embodiments of the present invention.Wherein, which write from more sides such as main website, extension station and terminal, and this method is suitable for scene described in Fig. 1 .1 and Fig. 1 .2.Method includes the following steps:

401, the first data to be transmitted is sent to the first extension station by main website, and indicates that the first extension station uses the first signal transmission power and the first clear channel assessment (CCA) CCA threshold value.

402, the first data to be transmitted is transferred to terminal using the first signal transmission power and the first clear channel assessment (CCA) CCA threshold value by the first extension station.

403, in the case where terminal is moved to the region of third extension station covering, terminal sends the third frequency point measurement result for being directed to third extension station to main website.

In the embodiment of the present invention, in the process of moving, if it find that the signal of adjacent area is preferable than the signal for the cell that terminal is currently located, then terminal actively can send frequency point measurement result to main website to terminal.

Such as: terminal is in the process of moving, it is eager to excel if it find that the signal received in the corresponding cell of third extension station is currently located the signal that the corresponding cell of the first extension station receives than terminal, at this moment, terminal can actively send the third frequency point measurement result for being directed to third extension station to main website.

404, main website determines the switching for needing to carry out extension station according to third frequency point measurement result.

In the embodiment of the present invention, main website receives after the third frequency point measurement result for third extension station of terminal transmission, main website can be according to third frequency point measurement result, terminal is currently located the signal that the first extension station receives to be compared with the signal that third extension station receives, it is eager to excel if the signal that third extension station receives is currently located the signal that the first extension station receives than terminal, main website can determine the switching for needing to carry out extension station.

405, main website moves towards the data distribution of terminal to be switched to third extension station from the first extension station.

406, third data to be transmitted is sent to third extension station by main website, and indicates third extension station using third signal transmission power and third clear channel assessment (CCA) CCA threshold value.

For example, for the first extension station and third extension station, if the signal strength that the terminal in first extension station coverage area receives is higher than the signal strength that the terminal in third extension station coverage area receives, the first signal transmission power that first extension station uses is less than the third signal transmission power that the third extension station uses, and the first CCA threshold value that first extension station uses is greater than the 2nd CCA threshold value that the third extension station uses.

407, third data to be transmitted is transferred to terminal using third signal transmission power and third clear channel assessment (CCA) CCA threshold value by third extension station.

In the embodiment of the present invention, terminal can be with the signal strength or weakness of real-time detection adjacent area, when the signal of discovery adjacent area When stronger, terminal can initiatively send the third frequency point measurement result for being directed to third extension station to main website, and triggering main website carries out the switching of extension station, in this way it is advantageously ensured that the signal that receives of terminal is stronger, promote the service rate of indoor terminal；Meanwhile terminal carries out the transmission of data using the signal transmission power and CCA threshold value of main website instruction, and main website may be implemented in this way and control the interference coordination multiple extension stations.

Fig. 5 is referred to, Fig. 5 is a kind of structural schematic diagram of base station disclosed by the embodiments of the present invention.Wherein, which is main website, which specifically refers to the description in Fig. 2~Fig. 4, details are not described herein for executing some or all of data transmission method described in Fig. 2~Fig. 4 step.The base station 500 may include:

First transmission unit 501, for sending signal in first community using narrowband coverage enhancement technology；

Access unit 502, for the access terminal in the first community；

Second transmission unit 503, for the first data to be transmitted to be sent to the first extension station, so that first data to be transmitted is transferred to the terminal by first extension station, wherein first extension station and the first community have common overlay area.

Wherein, the narrowband coverage enhancement technology includes the machine type communication eMTC or narrowband Internet of Things NB-IoT of enhancing.

Optionally, the main website polymerize CA technology using carrier wave with first extension station, and the first data to be transmitted is sent to the mode of the first extension station by second transmission unit 503 specifically:

Optionally, the main website and first extension station use dual link DC technology, and the first data to be transmitted is sent to the mode of the first extension station by second transmission unit 503 specifically:

Wherein, the main website is used for the terminal authentication, and transmits the control signaling of the terminal.

Fig. 6 is referred to, Fig. 6 is the structural schematic diagram of another base station disclosed by the embodiments of the present invention.Wherein, which is main website, which specifically refers to the description in Fig. 2~Fig. 3, details are not described herein for executing some or all of data transmission method described in Fig. 2~Fig. 3 step.Base station described in Fig. 6 is to scheme Advanced optimized on the basis of 5 base stations, base station described in Fig. 6 in addition to include Fig. 5 described in base station all units other than,

First transmission unit 501 is also used to the access unit 502 in the first community after access terminal, and Xiang Suoshu terminal sends frequency point measurement request；

Base station 500 described in Fig. 6 further include:

Receiving unit 504, the first frequency point measurement result reported for receiving the terminal；

Selecting unit 505, for selecting first extension station from least one described extension station according to the first frequency point measurement result.

Optionally, the selecting unit 505, there are also for selecting the second extension station from least one described extension station according to the second frequency point measurement result that the terminal is sent；

Second transmission unit 503 is also used to for the second data to be transmitted to be sent to second extension station, is transferred to the terminal to trigger second extension station for second data to be transmitted.

Optionally, base station 500 described in Fig. 6 can also include:

Control unit 506, for carrying out interference coordination control at least one described extension station.

Described control unit 506 carries out the mode of interference coordination control at least one described extension station specifically:

Signal transmission power and clear channel assessment (CCA) CCA threshold value used by each described extension station are indicated to extension station, each of at least one extension station, wherein, to any two extension station at least one described extension station, third extension station and the 4th extension station, if the signal strength that the terminal in third extension station coverage area receives is higher than the signal strength that the terminal in the 4th extension station coverage area receives, the signal transmission power that the third extension station uses is less than the signal transmission power that the 4th extension station uses, the CCA threshold value that the third extension station uses is greater than the CCA threshold value that the 4th extension station uses.

In the base station 500 described in Fig. 5~Fig. 6, signal can be sent in first community using narrowband coverage enhancement technology, in this way, main website can assist extension station, terminal is allowed to be linked into the corresponding first community of main website, further, the first data to be transmitted is sent to the first extension station by main website, and the first data to be transmitted can be transferred to terminal by the first extension station, so that main website and extension station effectively cooperate with, achieve the purpose that promote operator's covering and capacity, meanwhile, promote the service rate of terminal.

Referring to Fig. 7, Fig. 7 is the structural schematic diagram of another base station disclosed by the embodiments of the present invention.Wherein, base station shown in Fig. 7 can be used for executing some or all of data transmission method step described in Fig. 2~Fig. 3, specifically refer to the description in Fig. 2~Fig. 3, details are not described herein.As shown in Figure 7, the base station 700 may include: at least one processor 701, such as CPU (Central Processing Unit, central processing unit), at least one receiver 702, at least one transmitter 703 and memory 704, wherein, the processor 701, receiver 702, transmitter 703 and memory 704 are separately connected communication bus.Memory 704 can be high speed RAM memory, be also possible to non-volatile memory (non-volatile memory).It will be appreciated by those skilled in the art that, the structure of base station 700 shown in Fig. 7 does not constitute a limitation of the invention simultaneously, it is either busbar network, it is also possible to hub-and-spoke configuration, it can also include than more or fewer components shown in Fig. 7, perhaps certain components or different component layouts are combined.

Wherein, processor 701 is the control centre of base station 700, it can be central processing unit (Central Processing Unit, CPU), processor 701 utilizes the various pieces of various interfaces and the entire base station 700 of connection, by running or execute the software program and/or module that are stored in memory 704, and the program code for being stored in and storing in memory 704 is called, for performing the following operations:

Signal is sent in first community using narrowband coverage enhancement technology；

The access terminal in the first community；

First data to be transmitted is sent to the first extension station by the transmitter 703, is transferred to the terminal to trigger first extension station for first data to be transmitted, wherein first extension station and the first community have common overlay area.

Optionally, the main website polymerize CA technology using carrier wave with first extension station, and the processor is in such a way that the first data to be transmitted is sent to the first extension station by the transmitter 703 specifically:

Optionally, the main website and first extension station use dual link DC technology, and the processor is in such a way that the first data to be transmitted is sent to the first extension station by the transmitter 703 specifically:

Optionally, described in the first community after access terminal, the processor is also used to call the program code stored in the memory, for executing following steps:

Frequency point measurement request is sent to the terminal by the transmitter 703；

The first frequency point measurement result that the terminal reports is received by the receiver 702；

The first extension station is selected from least one described extension station according to the first frequency point measurement result.

Optionally, the processor 701 is also used to call the program code stored in the memory 704, for executing following steps:

Interference coordination control is carried out at least one described extension station.

Optionally, the processor 701 includes: to the progress interference coordination control of at least one described extension station

In the base station 700 described in Fig. 7, signal can be sent in first community using narrowband coverage enhancement technology, in this way, main website can assist extension station, terminal is allowed to be linked into the corresponding first community of main website, further, the first data to be transmitted is sent to the first extension station by main website, and the first data to be transmitted can be transferred to terminal by the first extension station, so that main website and extension station effectively cooperate with, achieve the purpose that promote operator's covering and capacity, meanwhile, promote the service rate of terminal.

Referring to Fig. 8, Fig. 8 is a kind of structural schematic diagram of communication system disclosed by the embodiments of the present invention.As shown in figure 8,800 main website 801 of communication system, extension station 802, core net 803 and the terminal 804.Wherein, which specifically refers to described in Fig. 2~Fig. 4, details are not described herein for executing data transmission method described in above method embodiment.Wherein, main website 801 can be base station 500 described in any one of Fig. 5~Fig. 6, or can be base station 700 described in Fig. 7, extension station 802 can be the first extension station, the second extension station or third extension station described in above-described embodiment, can also be other extension stations.

Wherein, the core net 803 establishes the first carrying, the core net 803 and the extension station 802 with the main website 801 and establishes the second carrying, the core net 803 carries to the terminal 804 by described first and sends the first data, and the core net 803 carries to the terminal 804 by described second and sends the second data.

It should be noted that, for each embodiment of the method above-mentioned, for simple description, therefore, it is stated as a series of action combinations, but those skilled in the art should understand that, the present invention is not limited by the sequence of acts described, because certain some step can be performed in other orders or simultaneously according to the application.Secondly, those skilled in the art should also know that, the embodiments described in the specification are all preferred embodiments, necessary to related actions and modules not necessarily the application.

In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, the part being not described in some embodiment, reference can be made to the related descriptions of other embodiments.

In several embodiments provided herein, it should be understood that disclosed device can be realized in other ways.Such as, the apparatus embodiments described above are merely exemplary, such as the division of the unit, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed mutual coupling, direct-coupling or communication connection can be through some interfaces, the indirect coupling or communication connection of device or unit, can be electrical or other forms.

The unit as illustrated by the separation member may or may not be physically separated, and component shown as a unit may or may not be physical unit, it can and it is in one place, or It may be distributed over multiple network units.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.

In addition, the functional units in various embodiments of the present invention may be integrated into one processing unit, it is also possible to each unit and physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated unit both can take the form of hardware realization, can also realize in the form of software functional units.

The steps in the embodiment of the present invention can be sequentially adjusted, merged and deleted according to actual needs.

Unit in the device of that embodiment of the invention can be combined, divided and deleted according to actual needs.

Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is relevant hardware can be instructed to complete by program, the program can be stored in a computer readable storage medium, storage medium may include: flash disk, read-only memory (Read-Only Memory, ROM), random access device (Random Access Memory, RAM), disk or CD etc..

It is provided for the embodiments of the invention a kind of data transmission method above and base station is described in detail, used herein a specific example illustrates the principle and implementation of the invention, and the above description of the embodiment is only used to help understand the method for the present invention and its core ideas；At the same time, for those skilled in the art, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion the contents of this specification are not to be construed as limiting the invention.

Claims

A kind of data transmission method, applied in the communication system including main website and at least one extension station characterized by comprising

The main website sends signal in first community using narrowband coverage enhancement technology；

Main website access terminal in the first community；

First data to be transmitted is sent to the first extension station by the main website, so that first data to be transmitted is transferred to the terminal by first extension station, wherein first extension station and the first community have common overlay area.
The method according to claim 1, wherein the narrowband coverage enhancement technology includes the machine type communication eMTC or narrowband Internet of Things NB-IoT of enhancing.
Method according to claim 1 or 2, which is characterized in that the main website polymerize CA technology using carrier wave with first extension station, and the first data to be transmitted is sent to the first extension station and includes: by the main website

First data to be transmitted is sent to first extension station on media access control MAC layer by the main website.
Method according to claim 1 or 2, which is characterized in that the main website and first extension station use dual link DC technology, and the first data to be transmitted is sent to the first extension station and includes: by the main website

First data to be transmitted is sent to first extension station on PDCP layers of Packet Data Convergence Protocol by the main website.
Method according to any one of claims 1 to 4, which is characterized in that the main website is used for the terminal authentication, and transmits the control signaling of the terminal.
Described in any item methods according to claim 1~5, which is characterized in that the main website in the first community after access terminal, the method also includes:

The main website sends frequency point measurement request to the terminal；

The main website receives the first frequency point measurement result that the terminal reports；

The main website selects first extension station according to the first frequency point measurement result from least one described extension station.
According to the method described in claim 6, it is characterized in that, after the method further include:

The main website selects the second extension station from least one described extension station according to the second frequency point measurement result that the terminal is sent；

Second data to be transmitted is sent to second extension station by the main website, is transferred to the terminal to trigger second extension station for second data to be transmitted.
Described in any item methods according to claim 1~7, which is characterized in that the method also includes:

The main website carries out interference coordination control at least one described extension station.
According to the method described in claim 8, it is characterized in that, the main website includes: to the progress interference coordination control of at least one described extension station

The main website indicates signal transmission power and clear channel assessment (CCA) CCA threshold value used by each described extension station to extension station, each of at least one extension station, wherein, to any two extension station at least one described extension station, third extension station and the 4th extension station, if the signal strength that the terminal in third extension station coverage area receives is higher than the signal strength that the terminal in the 4th extension station coverage area receives, the signal transmission power that the third extension station uses is less than the signal transmission power that the 4th extension station uses, the CCA threshold value that the third extension station uses is greater than the CCA threshold value that the 4th extension station uses.
A kind of base station, applied in the communication system including main website and at least one extension station, it is characterized in that, the base station is main website, comprising: processor, receiver, transmitter and memory, wherein, the processor, receiver, transmitter and memory are separately connected communication bus, batch processing code is stored in the memory, and the processor is used to call the program code stored in the memory, for executing following steps:

Signal is sent in first community using narrowband coverage enhancement technology；

The access terminal in the first community；

The first data to be transmitted is sent to the first extension station by the transmitter, is transferred to the terminal to trigger first extension station for first data to be transmitted, wherein first extension station and the first community have common overlay area.
Base station according to claim 10, which is characterized in that the narrowband coverage enhancement technology includes the machine type communication eMTC or narrowband Internet of Things NB-IoT of enhancing.
Base station described in 0 or 11 according to claim 1, which is characterized in that the main website and described first Extension station polymerize CA technology using carrier wave, and the processor is in such a way that the first data to be transmitted is sent to the first extension station by the transmitter specifically:

The first data to be transmitted is sent to first extension station on media access control MAC layer.
Base station described in 0 or 11 according to claim 1, which is characterized in that the main website and first extension station use dual link DC technology, and the processor is in such a way that the first data to be transmitted is sent to the first extension station by the transmitter specifically:

The first data to be transmitted is sent to the first extension station at PDCP layers of Packet Data Convergence Protocol.
0~13 described in any item base stations according to claim 1, which is characterized in that the main website is used for the terminal authentication, and transmits the control signaling of the terminal.
0~14 described in any item base stations according to claim 1, which is characterized in that described in the first community after access terminal, the processor is also used to call the program code stored in the memory, for executing following steps:

Frequency point measurement request is sent to the terminal by the transmitter；

The first frequency point measurement result that the terminal reports is received by the receiver；

First extension station is selected from least one described extension station according to the first frequency point measurement result.
Base station according to claim 15, which is characterized in that the processor is also used to call the program code stored in the memory, for executing following steps:

The main website selects the second extension station from least one described extension station according to the second frequency point measurement result that the terminal is sent；

Second data to be transmitted is sent to second extension station by the main website, is transferred to the terminal to trigger second extension station for second data to be transmitted.
0~16 described in any item base stations according to claim 1, which is characterized in that the processor is also used to call the program code stored in the memory, for executing following steps:

Interference coordination control is carried out at least one described extension station.
Base station according to claim 17, which is characterized in that the processor carries out interference coordination control at least one described extension station and includes:

Signal used by each described extension station is indicated to extension station, each of at least one extension station Transmission power and clear channel assessment (CCA) CCA threshold value, wherein, to any two extension station at least one described extension station, third extension station and the 4th extension station, if the signal strength that the terminal in third extension station coverage area receives is higher than the signal strength that the terminal in the 4th extension station coverage area receives, the signal transmission power that the third extension station uses is less than the signal transmission power that the 4th extension station uses, and the CCA threshold value that the third extension station uses is greater than the CCA threshold value that the 4th extension station uses.
A kind of communication system, which is characterized in that including such as described in any item main websites of claim 10-18, at least one extension station, core net and at least one terminal.
Communication system according to claim 19, it is characterized in that, the core net and the main website establish the first carrying, the core net and the extension station and establish the second carrying, the core net carries to the terminal by described first and sends the first data, and the core net carries to the terminal by described second and sends the second data.