CN103781125A - Method for adjusting uplink and downlink subframe configuration in heterogeneous network - Google Patents
Method for adjusting uplink and downlink subframe configuration in heterogeneous network Download PDFInfo
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- CN103781125A CN103781125A CN201210408641.1A CN201210408641A CN103781125A CN 103781125 A CN103781125 A CN 103781125A CN 201210408641 A CN201210408641 A CN 201210408641A CN 103781125 A CN103781125 A CN 103781125A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a method for adjusting uplink and downlink subframe configuration in a heterogeneous network. The method comprises the steps: a micro base station reports a subframe configuration parameter to a macro base station through an X2 interface according to the uplink and downlink service load status and power saving needs, the macro base station carries out adjustment according to the subframe configuration parameter and sends the determined uplink and downlink subframe configuration to the micro base station through the X2 interface, and the micro base station transmits service data according to the determined uplink and downlink subframe configuration. By applying the embodiment of the invention, the needs of micro cell service can be satisfied, and the mutual interference in the network can be controlled.
Description
Technical field
The application relates to communication technical field, more specifically, relates to a kind of adjust ascending-descending subframes configuration in heterogeneous network method.
Background technology
In LTE-Advanced network, in order to provide focus to cover and to expand cell coverage area, introduce the network configuration of heterogeneous network.Heterogeneous network refers in macro base station (Macro eNB) overlay area, disposes lower powered node, thereby forms the heterogeneous network system that comprises different node types.Low power nodes comprises micro-base station (Pico eNB), wherein one or more of Home eNodeB (Home eNB) and relay base station (Relay eNB), as shown in Figure 1.Wherein, Pico eNB, Home eNB and Relay eNB and Macro eNB are by X2 interface interaction data.
In TD-LTE system, for adapting to different districts up-downgoing traffic carrying capacity, different districts can take different ascending-descending subframes to be configured to improve throughput of system.Under the TD-LTE system macro base station shown in accompanying drawing 1 and micro-base stations united deployment scenario, in a macrocell, multiple Microcells are disposed.Wherein macrocell is fixing uses a kind of ascending-descending subframes to configure, and Microcell can be according to the different ascending-descending subframes configurations of load Dynamic Selection.In the time that ascending-descending subframes configuration is selected voluntarily according to self up-downgoing load in multiple Microcells, can be on original interference (being the interference while fixedly taking identical sub-frame configuration of macrocell and Microcell) basis, introducing transmission direction collision, specifically comprises following three kinds of situations:
Sight 1: macro base station descending sub frame and the collision of micro-base station sub-frame of uplink, macro base station causes interference to the uplink receiving of micro-base station.Above-mentioned interference is especially serious, and this is because within Microcell is positioned at the coverage of macrocell, therefore the downstream signal of macrocell is a kind of strong jamming for the uplink receiving of Microcell.
Sight 2: macro base station sub-frame of uplink and the collision of micro-base station down subframe, interference is caused to the uplink receiving of macro base station in micro-base station.
Uplink and downlink subframe collision between 3: two micro-base stations of sight.
In prior art, ascending-descending subframes configuration in micro-base station comprises following two schemes:
Scheme one: limit the optional ascending-descending subframes configuration in micro-base station.
Descending sub frame and micro-base station sub-frame of uplink for fear of macro base station bump, and according to the ascending-descending subframes configuration of macro base station, limit micro-base station and can arrangement must meet macro base station descending sub frame and do not occur with micro-base station sub-frame of uplink simultaneously.As shown in table 1, as macro base station uses ascending-descending subframes configuration 1, the optional ascending-descending subframes in micro-base station is configured to 1,2,4,5, has so just avoided macro base station descending sub frame and micro-base station sub-frame of uplink to bump.D represents descending sub frame, and S represents special subframe, and U represents sub-frame of uplink.
Table 1
Scheme two: base station basis around interference environment is dynamically adjusted ascending-descending subframes configuration.
Different base station, by measurement and feedback to interference environment and type of service, is realized the method that uses different TDD ascending-descending subframes proportional arrangement in different districts., low-power website is dynamically adjusted the ascending-descending subframes configuration of self according to interference environment.
Scheme one has avoided the descending sub frame of macrocell to disturb the situation of Microcell sub-frame of uplink, adjusts but reduced Microcell the flexibility that ascending-descending subframes configures, and can not adapt to well Microcell load.Because, if the total downlink traffic of macrocell is larger, select the larger sub-frame configuration of descending sub frame proportion, as the sub-frame configuration 2 in table 1, the optional sub-frame configuration in Microcell just only has 5 one kinds of configurations so.Limit so on the one hand the flexibility that Microcell selects ascending-descending subframes to configure; On the other hand, if Microcell upstream traffic is more, sub-frame configuration 5 obviously can not meet picocell traffic demand so.
Scheme two is to adjust voluntarily himself ascending-descending subframes by each base station to configure.In the time that a macrocell has been disposed multiple micro-base station, may occur that the environment around each micro-base station basis is decided ascending-descending subframes configuration in its sole discretion.But because each base station is not considered the situation such as interference and load of whole network now may cause the interference of whole network uncontrollable.
Summary of the invention
The embodiment of the present invention proposes to adjust in a kind of heterogeneous network the method for ascending-descending subframes configuration, not only can meet the demand of picocell traffic, can also control the phase mutual interference in network.
The technical scheme of the embodiment of the present invention is as follows:
A method of adjusting ascending-descending subframes configuration in heterogeneous network, described method comprises:
Micro-base station, according to up-downgoing business load situation and/or economize on electricity demand, reports sub-frame configuration parameter by X2 interface to macro base station;
The sub-frame configuration parameter that macro base station reports according to micro-base station is adjusted, and the ascending-descending subframes configuration after determining is sent to micro-base station by X2 interface;
Micro-base station is according to the ascending-descending subframes configuration service data transmission after determining.
Described economize on electricity demand comprises: if there is no service data transmission demand in subframe, be sub-frame of uplink by described sub-frame configuration.
Described micro-base station comprises according to up-downgoing business load situation and/or economize on electricity demand: set T duration, micro-base station in T duration according to up-downgoing business load situation and/or economize on electricity demand.
Described sub-frame configuration parameter comprises: the ascending-descending subframes configuration using is wished in micro-base station.
Described sub-frame configuration parameter comprises: the ascending-descending subframes configuration and the sub-frame of uplink number for economizing on electricity that use are wished in micro-base station.
Described sub-frame configuration parameter comprises: for sub-frame of uplink number and the descending sub frame number of service data transmission.
The sub-frame configuration parameter that described macro base station reports according to micro-base station is adjusted and is comprised: macro base station according to the distance of micro-base station that reports sub-frame configuration parameter, adjust self ABS sub-frame configuration.
The ABS sub-frame configuration of described adjustment self comprises: described distance is less than threshold value 1, and macro base station is ABS sub-frame configuration low-power; Described distance is more than or equal to threshold value 1, and macro base station is ABS sub-frame configuration high power.
The sub-frame configuration parameter that described macro base station reports according to micro-base station is adjusted and is comprised: for the micro-base station that is less than threshold value 2 apart from macro base station, the sub-frame configuration parameter that macro base station reports according to described micro-base station, the subframe of adjusting the micro-base station corresponding with the sub-frame of uplink position of macro base station is sub-frame of uplink.
Distance between first micro-base station and second micro-base station is less than threshold values 3, and the sub-frame configuration parameter that described macro base station reports according to micro-base station is adjusted and comprised: macro base station is that first micro-base station and second micro-base station configure identical ascending-descending subframes configuration;
Directly obtain described distance according to network design.
Obtain described distance according to the measurement between base station.
From technique scheme, can find out, micro-base station, according to up-downgoing business load situation and/or economize on electricity demand, reports sub-frame configuration parameter by X2 interface to macro base station in embodiments of the present invention; The sub-frame configuration parameter that macro base station reports according to micro-base station is adjusted, and the ascending-descending subframes configuration after determining is sent to micro-base station by X2 interface; Micro-base station is according to the ascending-descending subframes configuration service data transmission after determining.Micro-base station and macro base station are communicated with each other, and not only can meet the demand of picocell traffic, can also control the interference in network.
Accompanying drawing explanation
Fig. 1 is macro base station and micro-base stations united deployment schematic diagram in prior art;
Fig. 2 is the method flow schematic diagram of adjusting ascending-descending subframes configuration in heterogeneous network;
Fig. 3 is macrocell configures low power ABS schematic diagram.
Embodiment
For making the object, technical solutions and advantages of the present invention express clearlyer, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
In embodiments of the present invention, micro-base station can be according to self up-downgoing business load situation and/or economize on electricity Location of requirement sub-frame configuration parameter, and informs macro base station by X2 interface.The sub-frame configuration parameter that macro base station reports according to multiple micro-base stations is adjusted, to determine the ABS sub-frame configuration of self and the ascending-descending subframes configuration of micro-base station.The process that this micro-base station and macro base station are mutual, not only can meet the demand of picocell traffic, can also control micro-base station and macro base station in network, and phase mutual interference between micro-base station.
Describe technical scheme of the present invention in detail below in conjunction with accompanying drawing 2.
Step 301, micro-base station, according to up-downgoing business load situation and/or economize on electricity demand, report sub-frame configuration parameter by X2 interface to macro base station.
Up-downgoing business load situation comprises: the ascending-descending subframes configuration of this ratio is selected to approach most in micro-base station according to the ratio of uplink service load and downlink business load.
The demand of economize on electricity comprises: for base station, if there is no the demand of service data transmission in a subframe, if be so now sub-frame of uplink by this sub-frame configuration, can make base station more economize on electricity.This is that base station need to send some necessary signals, as the signal such as public reference signal, Physical Control Format Indicator Channel because if be descending sub frame by this sub-frame configuration.Therefore,, the in the situation that of undercapacity, the ascending-descending subframes configuration that comprises more sub-frame of uplink can be selected in order to meet node demand in micro-base station as far as possible.
In addition,, for avoiding frequently reporting triggering due to what short time up-downgoing traffic fluctuations caused, a time interval T is set.If all meet up-downgoing business load situation and/or economize on electricity demand in T duration, micro-base station reports sub-frame configuration parameter to macro base station.
Micro-base station reports to macro base station by X2 interface, and sub-frame configuration parameter can be following one:
1, the ascending-descending subframes configuration using is wished in micro-base station.
The ascending-descending subframes configuration of own desired use is directly selected in micro-base station according to up-downgoing business load situation and/or economize on electricity demand, and notice is to macro base station.For example, fully loaded in the situation that, the up-downgoing business load ratio of Microcell approaches at 1: 1 o'clock, and micro-base station selected ascending-descending subframes configuration 1(is in table 1) configure and reported macro base station as the ascending-descending subframes of own desired use.In addition, the in the situation that of undercapacity, UE can consider business load situation and economize on electricity demand, in the situation that can meeting business load demand, can select sub-frame of uplink ascending-descending subframes how configuration as far as possible.For example, micro-base station need to be used 2 descending sub frames and 2 sub-frame of uplink service data transmissions, now can select ascending-descending subframes configuration 0(to comprise 2 descending sub frames and 6 sub-frame of uplink), and reported macro base station.
2, the ascending-descending subframes configuration and the sub-frame of uplink number for economizing on electricity that use are wished in micro-base station.
In all sub-frame of uplink, some subframe is for service data transmission, and some subframe is for economizing on electricity.For the sub-frame of uplink for economizing on electricity, now Microcell does not have business data transmission in this subframe, and therefore macro base station can be considered the interference problem in this subframe, thereby can the macrocell descending sub frame corresponding with this sub-frame of uplink be configured to ABS.
For example, the in the situation that of undercapacity, when the up-downgoing business proportion of Microcell approaches 1:2, micro-base station selected sub-frame configuration 1(is in table 1) configure and reported macro base station as the ascending-descending subframes of own desired use, the parameter simultaneously reporting also comprises: in this ascending-descending subframes configuration, have 2 sub-frame of uplink for economizing on electricity.Like this, macro base station is being received after this information, for those two sub-frame of uplink for economizing on electricity, can corresponding macrocell descending sub frame be configured to ABS.
3, micro-base station is for sub-frame of uplink number and the descending sub frame number of service data transmission.
For example, micro-base station notice macro base station needs 4 descending sub frames and 1 sub-frame of uplink to be used for transmitting data, macro base station can configure 1(in table 1 for micro-base station configuration ascending-descending subframes so), in 4 sub-frame of uplink wherein comprising, 3 subframes are for economizing on electricity, for the macrocell descending sub frame corresponding with these subframes, can not be configured as ABS.
The sub-frame configuration parameter that step 302, macro base station report according to micro-base station is adjusted, and the ascending-descending subframes configuration after determining is sent to micro-base station by X2 interface.
The sub-frame configuration parameter that macro base station reports according to micro-base station is adjusted, and to determine the ABS sub-frame configuration of self and the ascending-descending subframes configuration of micro-base station, and the ascending-descending subframes configuration after determining is sent to micro-base station by X2 interface.
Macro base station according to the distance of micro-base station that reports sub-frame configuration parameter, adjust self ABS sub-frame configuration.For the descending sub frame of macro base station and the afoul scene of the sub-frame of uplink for service data transmission of micro-base station, macro base station descending sub frame is set to ABS subframe, to reduce the interference up to micro-base station.
Macro base station need to obtain the positional information of each micro-base station, so that adjust ABS sub-frame configuration (ABS position, number and transmitting power).
Macro base station can by following two kinds arbitrarily method obtain the positional information of micro-base station.One is to dispose and obtain micro-base station position information according to carrier network, and operation and maintenance system (OAM) can be notified micro-base station position information to macro base station.Another kind is between base station, to measure (being similar to the measurement behavior of UE), the for example downstream signal of micro-base station measurement macro base station, send measurement result to macro base station by X2 interface afterwards, then macro base station can be known path loss according to self transmitting power, and macro base station just can be estimated the distance of micro-base station apart from oneself like this.
In the present invention, relate to the distance between macro base station and micro-base station, and distance between micro-base station can adopt aforesaid way to obtain.
Disturb micro-base station sub-frame of uplink for sight 1(macro base station descending sub frame)
Macrocell is configured to the ABS of low power transmissions by producing the descending sub frame disturbing, thereby reduces the macro base station interference up to micro-base station.In order to take into account efficiency, can adopt the ABS subframe of different transmission power in addition.ABS subframe transmitting power size is according to the set positions of disturbed micro-base station.Between micro-base station and macro base station, distance is less than default threshold value 1, and macro base station is even zero energy of ABS configures low power; Between micro-base station and macro base station, distance is more than or equal to default threshold value 1, and macro base station is ABS configuration high power.
Referring to Fig. 3, macro base station is that different ABS configures different transmitting powers according to the distance of micro-base station, the micro-base station that is wherein positioned at macrocell central area can be used the sub-frame of uplink of lower-powered ABS1 as oneself, and the micro-base station that is positioned at macrocell fringe region can be used ABS1 and the larger ABS2 of the power sub-frame of uplink as oneself.
Disturb macro base station sub-frame of uplink for the micro-base station down subframe of sight 2()
The micro-base station that is positioned at macrocell central area is more much bigger to the interference of macro base station generation than the micro-base station that is positioned at cell edge to the interference of macro base station generation, thereby macro base station is in the time determining the sub-frame configuration of the micro-base station in central area, should avoid the descending sub frame of micro-base station and the sub-frame of uplink of macro base station to produce collision as far as possible.For the micro-base station that is less than default threshold value 2 apart from macro base station, the subframe of adjusting the micro-base station corresponding with the sub-frame of uplink position of macro base station is sub-frame of uplink.
Disturb for uplink and downlink subframe between two micro-base stations of situation 3()
If micro-base station is decided its ascending-descending subframes configuration in its sole discretion, between different micro-base stations, may there is the situation that sub-frame of uplink and descending sub frame collide, if now different micro-base station distance are nearer, can cause each other more serious interference.For this scene, macro base station can be determined according to the positional information of micro-base station the sub-frame configuration of micro-base station, as the distance between first micro-base station and second micro-base station is less than default threshold value 3, macro base station is that first micro-base station and second micro-base station configure identical sub-frame configuration.
Step 303, micro-base station are according to the ascending-descending subframes configuration service data transmission after determining.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. a method of adjusting ascending-descending subframes configuration in heterogeneous network, is characterized in that, described method comprises:
Micro-base station, according to up-downgoing business load situation and/or economize on electricity demand, reports sub-frame configuration parameter by X2 interface to macro base station;
The sub-frame configuration parameter that macro base station reports according to micro-base station is adjusted, and the ascending-descending subframes configuration after determining is sent to micro-base station by X2 interface;
Micro-base station is according to the ascending-descending subframes configuration service data transmission after determining.
2. in heterogeneous network, adjust the method that ascending-descending subframes configures according to claim 1, it is characterized in that, described economize on electricity demand comprises: if there is no service data transmission demand in subframe, be sub-frame of uplink by described sub-frame configuration.
3. in heterogeneous network, adjust the method that ascending-descending subframes configures according to claim 1, it is characterized in that, described micro-base station comprises according to up-downgoing business load situation and/or economize on electricity demand: set T duration, micro-base station in T duration according to up-downgoing business load situation and/or economize on electricity demand.
4. in heterogeneous network, adjust the method that ascending-descending subframes configures according to claim 1, it is characterized in that, described sub-frame configuration parameter comprises: the ascending-descending subframes configuration using is wished in micro-base station.
5. in heterogeneous network, adjust the method that ascending-descending subframes configures according to claim 1, it is characterized in that, described sub-frame configuration parameter comprises: the ascending-descending subframes configuration and the sub-frame of uplink number for economizing on electricity that use are wished in micro-base station.
6. in heterogeneous network, adjust the method that ascending-descending subframes configures according to claim 1, it is characterized in that, described sub-frame configuration parameter comprises: for sub-frame of uplink number and the descending sub frame number of service data transmission.
7. in heterogeneous network, adjust the method that ascending-descending subframes configures according to claim 1, it is characterized in that, the sub-frame configuration parameter that described macro base station reports according to micro-base station is adjusted and is comprised: macro base station according to the distance of micro-base station that reports sub-frame configuration parameter, adjust self ABS sub-frame configuration.
8. in heterogeneous network, adjust the method that ascending-descending subframes configures according to claim 7, it is characterized in that, the ABS sub-frame configuration of described adjustment self comprises: described distance is less than threshold value 1, and macro base station is ABS sub-frame configuration low-power; Described distance is more than or equal to threshold value 1, and macro base station is ABS sub-frame configuration high power.
9. in heterogeneous network, adjust the method that ascending-descending subframes configures according to claim 1, it is characterized in that, the sub-frame configuration parameter that described macro base station reports according to micro-base station is adjusted and is comprised: for the micro-base station that is less than threshold value 2 apart from macro base station, the sub-frame configuration parameter that macro base station reports according to described micro-base station, the subframe of adjusting the micro-base station corresponding with the sub-frame of uplink position of macro base station is sub-frame of uplink.
10. in heterogeneous network, adjust the method that ascending-descending subframes configures according to claim 1, it is characterized in that, distance between first micro-base station and second micro-base station is less than threshold values 3, and the sub-frame configuration parameter that described macro base station reports according to micro-base station is adjusted and comprised: macro base station is that first micro-base station and second micro-base station configure identical ascending-descending subframes configuration.
11. according to the method for adjusting ascending-descending subframes configuration in heterogeneous network described in claim 7,8,9 or 10, it is characterized in that, directly obtains described distance according to network design.
12. according to the method for adjusting ascending-descending subframes configuration in heterogeneous network described in claim 7,8,9 or 10, it is characterized in that, obtains described distance according to the measurement between base station.
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