CN103139913A - Method for configuring up-going detection reference signals and line termination equipment (LTE) heterogeneous network - Google Patents
Method for configuring up-going detection reference signals and line termination equipment (LTE) heterogeneous network Download PDFInfo
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Abstract
The invention provides a method for configuring up-going detection reference signals and a line termination equipment (LTE) heterogeneous network. A macro cell site of the LTE heterogeneous network and small power transmission nodes in the covering area of the LTE heterogeneous network form a heterogeneous small area cluster, a plurality of CoMP small areas in the heterogeneous small area cluster forms a CoMP cooperation collection for carrying out coordinated multipoint transmission for a same user terminal, area stage SRS resources of the CoMP area and user stage SRS resources of CoMP user experience design (UE) are uniformly configured by the macro cell site of a cluster, and thus the orthogonality of the CoMP UE and the CoMP, the CoMP UE and non-CoMP UE and the non-CoMP UE and the non-CoMP UE of the small area cooperation collection are achieved. According to the method for configuring the up-going detection reference signals and the LTE heterogeneous network, signal to interference plus noise ratio (SINR) of user SRS is improved, and interactive data quantity brought by coordinated SRS resource configuration of each small area is reduced.
Description
Technical field
The present invention relates to moving communicating field, be particularly related to a kind of uplink detection reference signal collocation method for LTE isomery networking CoMP and the LTE heterogeneous network of collocating uplink sounding reference signal, can solve the problem of the uplink detection reference signal phase mutual interference that the LTE heterogeneous network occurs when carrying out CoMP.
Background technology
The networking of LTE isomery typically refers to a kind of networking mode that adopts macrocellular (Macro eNB) and small-power transmission equipment (LPN:Low Power Node is as microcellulor, Pico, RRH etc.) to carry out mixed deployment in the LTE network.The LTE heterogeneous network forms overlapping covering by dispose several small-power transmission equipments in the macrocellular overlay area, is used for solving weak covering and capacity limitation problem in the macrocellular overlay area.See Fig. 1.
In the LTE system, uplink reference signals is mainly used in measurement, the power of correlation demodulation, up channel and controls, regularly and the estimation of wave beam forming arrival direction.In order to realize above-mentioned functions, the LTE physical layer has defined two kinds of uplink reference signals, comprises demodulated reference signal DMRS and detection reference signal SRS.Demodulated reference signal DMRS is mainly used in the correlation demodulation of data, and detection reference signal SRS refers to terminal in the reference signal of the subscriber channel state measurement of up transmission, the state of up channel is measured in the base station by receiving the SRS signal, relevant information is used for the adaptive scheduling to transmitting uplink data.In the situation that TDD due to the symmetry with frequency range up-downgoing channel, by obtaining the information of down channel state to the measurement of uplink detection reference signal, is used for auxiliary downlink transfer.
LTE isomery network construction characteristic has determined to reside in the signal transmission that terminal in LPN (the little station of low-power) residential quarter receives Macro eNB (macrocell base stations) and LPN simultaneously, because quadrature multi-access mode based on OFDM is adopted in the provisional capital up and down of LTE system, there is comparatively serious interference in the minizone, particularly under the isomery networking mode, Macro eNB and LPN overlay area are overlapped, if Macro eNB is from the same frequency of LPN and adopt different cell ID, no matter will cause terminal to reside in eNB residential quarter or LPN residential quarter, all can be subject to the severe jamming of the other side residential quarter.Therefore, in order to satisfy the requirement of LTE networking performance, 3GPP has proposed employing coordinated multipoint transmission CoMP and has solved isomery networking interference problem in the upgrade-system (LTE-Advanced) of its mobile cellular communication of future generation system-Long Term Evolution project.
Coordinated multipoint transmission CoMP technology refers to a plurality of transfer points that separate in the geographical position, the collaborative transfer of data that participates in same terminal, for convenience of statement, below will adopt the subscriber equipment of coordinated multipoint transmission technology to be called CoMP UE, and not adopt the subscriber equipment of coordinated multipoint transmission technology to be called non-CoMP UE; Adopt the residential quarter of coordinated multipoint transmission technology to be called the CoMP residential quarter, in the CoMP residential quarter, the resident residential quarter of CoMP UE is called persistent district, in the CoMP residential quarter, other are called cooperation cell for CoMP UE provides the residential quarter of cooperation transmission, and the set of COMP residential quarter is called the CoMP cooperation.
CoMP specification requirement system can effectively obtain the channel condition information of CoMP UE, and the ascending channel detecting reference signal that CoMP UE sends can help system estimate uplink channel information, particularly in the TDD system, can also utilize the reciprocity of up-downgoing channel to come the acquisition system to the descending channel information of CoMP UE.Therefore, the uplink detection reference signal quality good or not of CoMP UE has considerable influence for the CoMP effect.
The CoMP technology mainly comprises Combined Treatment and collaborative figuration.The Combined Treatment technology refers at downlink transmission direction, the packet that sends to this UE is all preserved in all CoMP residential quarter that is CoMP UE service, system is different from business demand according to scheduling result, selects wherein part residential quarter or all residential quarters to send data to this UE.Collaborative figuration technology refers to the CoMP minizone by coordinating the beam direction of transmitted signal, and the wave beam that interference ratio is larger is avoided, and reaches the purpose that reduces minizone phase mutual interference.
No matter be collaborative wave beam forming or the Combined Treatment in CoMP, the feedback of channel condition information is the key that CoMP uses.LTE-A has defined three kinds of feedback mechanisms that CoMP may adopt, and comprises dominant feedback, recessive feedback and based on the feedback of channel information of SRS.
Wherein the channel feedback mechanism based on SRS is subjected to the uplink detection reference signal quality influence maximum.Feedback of channel information based on SRS refers to that terminal sends uplink detection reference signal SRS, the SRS that a plurality of base stations (transfer point) of CoMP participating send according to terminal, estimate the uplink channel information of terminal to base station, and utilize uplink channel information that the down channel state is estimated, thereby a plurality of base station (transfer point) works in coordination with operations such as completing pre-coding matrix, MCS selection and frequency domain dispatching.
At present in the LTE system, mainly defined sequence that uplink detection reference signal SRS uses and in the mapping of time-frequency domain.
What uplink detection reference signal SRS used is the sequence with permanent envelope zero auto-correlation (Constant Amplitude Zero Auto-Correlation, CAZAC) characteristic.Length is
The mathematic(al) representation of sequence be:
Wherein
Be basic sequence, jointly determined by the numbering " u " of basic sequence group and the basic sequence group # " v " in group, α is the cyclic shift to basic sequence, and the different cyclic shifts of same base sequence form different reference signal sequences.For length more than or equal to 36 reference signal sequence, use length to generate basic sequence as the Zadoff-Chu sequence of prime number, less than 36 reference signal sequence, use the method for computer search to obtain auto-correlation optimum sequence relative to their cross correlation for length.
Uplink detection reference signal sends at last OFDM symbol of subframe.Take allocating cell class survey reference signal period of sub-frame T in each residential quarter
SFCAnd offset Δ
SFC, defined the subframe time location that can be used for sending uplink detection reference signal in the residential quarter.As, suppose configuration T
SFC=5, Δ
SFC={ 0,1}, the time location of residential quarter detection reference signal subframe is as shown in Figure 2.
On the basis of the cell-level SRS subframe position that defines the residential quarter, send the user class period of sub-frame T of SRS by configure user
SRSWith side-play amount T
Offset, further defined the subframe position that certain user in the residential quarter sends uplink SRS.As, on the basis of above-mentioned residential quarter SRS sub-frame configuration, configure certain user's T
SRS=0, T
Offset=1, can obtain this user uplink detection reference signal time location as shown in Figure 3.
In the LTE system, the distribution of uplink detection reference signal SRS resource take the residential quarter as unit.The SRS basic sequence of each residential quarter number obtains according to cell ID (Cell ID), and the basic sequence of the SRS of different districts number may be different.And the SRS of the neighbor cell transmission cycle is configured voluntarily by this residential quarter, and when transmitting in the SRS of neighbor cell is configured in identical subframe, because the SRS basic sequence of neighbor cell is different, the SRS in neighbor cell can the phase mutual interference.
Because the present uplink detection reference signal SRS of LTE is not optimized design for isomery networking CoMP, the resource distribution that is the uplink detection reference signal SRS of CoMP residential quarter in the isomery networking is still decided in its sole discretion by each residential quarter, therefore the SRS that distributes when different CoMP residential quarter is configured in identical subframe and identical frequency domain position when transmitting, will bring serious interference each other, affect the accuracy of uplink channel estimation, reduced the performance gain of CoMP.
Give an example, terminal a resides in the LPN residential quarter and transmits by eNB residential quarter and LPN cell cooperative.The uplink detection reference signal SRS that terminal a sends also needs to detect the channel of eNB residential quarter in the channel while of surveying the LPN residential quarter.If take the present uplink detection reference signal SRS allocation plan of LTE, the eNB residential quarter will be subject to the severe jamming of terminal b when the SRS of receiving terminal a.Being on the one hand because the SRS burst that terminal a and b send is non-orthogonal, is because the signal of the terminal b that the eNB residential quarter receives often is greater than the signal of terminal a on the other hand.Strongly disturbing existence will cause system that the performance of channel estimating is descended greatly, affect isomery networking CoMP implementation result.As shown in Figure 4.
Summary of the invention
In view of more than, the present invention proposes a kind of method and LTE heterogeneous network of collocating uplink sounding reference signal.
The method of a kind of collocating uplink sounding reference signal that the present invention proposes comprises the following steps:
Macrocell base stations in the LTE heterogeneous network and the small-power transmission node in the area of coverage are consisted of the isomery cell cluster, the cell-level uplink detection reference signal (SRS) of CoMP cooperation in the unified configuration of macrocell base stations bunch in bunch, in the cell-level SRS configuration of CoMP residential quarter is sent to bunch, each residential quarter of CoMP cooperation, comprise persistent district and cooperation cell;
The SRS of the unified configuration of macrocell base stations CoMP UE in bunch, in the SRS of described COMP UE and CoMP cooperation, other obtain the SRS quadrature of the UE of configuration, in the SRS resource of described CoMP UE is sent to bunch, each residential quarter of CoMP cooperation, comprise persistent district and cooperation cell;
Each residential quarter of CoMP cooperation is configured according to the cell-level SRS configuration that receives;
The persistent district of described CoMP UE sends to described CoMP UE with the CoMP UE SRS resource distribution that receives by high-level signaling, the persistent district of described CoMP UE configures the SRS resource of the non-CoMP UE in this residential quarter voluntarily, and all UE that obtain to configure of this residential quarter comprise that the SRS of described CoMP UE is mutually orthogonal;
The cooperation cell of described CoMP UE configures the SRS resource of the non-CoMP UE in this residential quarter voluntarily, and the SRS of the UE of all acquisition configurations of this residential quarter is mutually orthogonal, and mutually orthogonal with the SRS of described CoMP UE.
Small-power transmission node in the LTE heterogeneous network of a kind of collocating uplink sounding reference signal that the present invention proposes, the macrocell base stations in the LTE heterogeneous network and the area of coverage consists of the isomery cell cluster, and described LTE heterogeneous network comprises:
The cell-level uplink detection reference signal (SRS) of CoMP cooperation in base station, unified configuration bunch, the SRS configuration of unified configuration CoMP UE; In the SRS of the cell-level SRS of CoMP residential quarter and CoMP UE is sent to bunch, each residential quarter of CoMP cooperation, comprise persistent district and cooperation cell, and in the SRS of described COMP UE and CoMP cooperation, other obtain the SRS quadrature of the UE of configuration;
CoMP UE persistent district, be configured according to the cell-level SRS configuration that receives, the CoMP UE SRS resource distribution that receives is sent to described CoMP UE by high-level signaling, described CoMP UE persistent district configures the SRS resource of the non-CoMP UE in this residential quarter voluntarily, and all UE that obtain to configure of this residential quarter comprise that the SRS of described CoMP UE is mutually orthogonal;
CoMP UE cooperation cell is configured according to the cell-level SRS configuration that receives, and configures voluntarily the SRS resource of the non-CoMP UE in this residential quarter, and the SRS of the UE of all acquisition configurations of this residential quarter is mutually orthogonal, and mutually orthogonal with the SRS of described CoMP UE.
The present invention is by carrying out the unified configuration of uplink detection reference signal to the CoMP residential quarter in the LTE heterogeneous network, the uplink detection reference signal that reduces between LTE heterogeneous network small area disturbs, and improves the accuracy of channel estimating.Interaction data amount between the residential quarter that all right further saving of the present invention CoMP produces is guaranteed the performance gain that coordinated multipoint transmission CoMP brings.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of a part of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 illustrates prior art LTE isomery network construction form.
Fig. 2 is the SRS subframe time location that the prior art residential quarter is shown.
Fig. 3 is the SRS subframe time location that the prior art user is shown.
Fig. 4 is that the SRS that the networking of prior art LTE isomery is shown disturbs example.
Fig. 5 illustrates LTE isomery networking SRS configuration and transfer process schematic diagram in the embodiment of the present invention.
Fig. 6 is the SRS collocation method that LTE isomery of the present invention networking is shown.
Embodiment
Affect the problem of minizone channel estimating quality for each transfer point uplink detection reference signal SRS phase mutual interference that exists in LTE isomery networking COMP, the present invention proposes a kind of uplink detection reference signal collocation method for LTE isomery networking CoMP and the LTE heterogeneous network of collocating uplink sounding reference signal.
The present invention proposes a kind of LTE heterogeneous network of collocating uplink sounding reference signal, its networking structure as shown in Figure 1, the small-power transmission node in the macrocell base stations in the LTE heterogeneous network and the area of coverage consists of the isomery cell cluster, described LTE heterogeneous network comprises:
The cell-level uplink detection reference signal (SRS) of CoMP cooperation in base station, unified configuration bunch, the SRS configuration of unified configuration CoMP UE; In the SRS of the cell-level SRS of CoMP residential quarter and CoMP UE is sent to bunch, each residential quarter of CoMP cooperation, comprise persistent district and cooperation cell, and in the SRS of described COMP UE and CoMP cooperation, other obtain the SRS quadrature of the UE of configuration;
CoMP UE persistent district, be configured according to the cell-level SRS configuration that receives, the CoMP UE SRS resource distribution that receives is sent to described CoMP UE by high-level signaling, described CoMP UE persistent district configures the SRS resource of the non-CoMP UE in this residential quarter voluntarily, and all UE that obtain to configure of this residential quarter comprise that the SRS of described CoMP UE is mutually orthogonal;
CoMP UE cooperation cell is configured according to the cell-level SRS configuration that receives, and configures voluntarily the SRS resource of the non-CoMP UE in this residential quarter, and the SRS of the UE of all acquisition configurations of this residential quarter is mutually orthogonal, and mutually orthogonal with the SRS of described CoMP UE.
The present invention can adopt arbitrary orthogonal manner of prior art, realizes mutually orthogonal.The orthogonal manner of prior art is for example:
Frequency domain that is to say that the reference signal with different user is placed on different carrier waves;
Time domain namely is placed on the reference signal of different user different subframe (or on the different sign bit of same subframe).
For LTE heterogeneous network and method to collocating uplink sounding reference signal of the present invention clearly illustrate, be elaborated respectively below in conjunction with Fig. 5 and Fig. 6.
Fig. 6 illustrates a kind of uplink detection reference signal SRS collocation method for LTE isomery networking CoMP provided by the invention.The method comprises the following steps:
Macrocell base stations eNB residential quarter in step 601, LTE heterogeneous network and the small-power transmission node LPN residential quarter in its area of coverage form the isomery cell cluster.The cell-level SRS resource of the CoMP residential quarter in the isomery cell cluster is by the unified configuration of macrocell base stations eNB.
The cell-level SRS resource of described CoMP residential quarter comprises: CoMP residential quarter SRS basic sequence number, CoMP residential quarter special uplink detection reference signal SRS period of sub-frame T
SFCWith CoMP residential quarter special uplink detection reference signal SRS transmission bias Δ
SFC, the user uplink detection reference signal SRS period of sub-frame T of CoMP residential quarter
SRSWith user uplink detection reference signal SRS transmission biasing T
OffsetEspecially, the base station is with CoMP community user SRS period of sub-frame T
SRSBe divided into a plurality of user class SRS set U
i(i=1,2 ...), and press SRS transmission biasing T
OffsetUser class SRS set is subdivided into CoMP user SRS subset
With non-CoMP user SRS subset
The method that set is divided is a lot, and principle is divided into CoMP user SRS subset () and non-CoMP user SRS subset () exactly.
Each residential quarter of CoMP cooperation in the every secondary response CoMP request of step 602, eNB or in periodically the cell-level SRS configuration of CoMP residential quarter being sent to bunch comprises persistent district and cooperation cell.
The SRS resource of CoMP UE in step 603, isomery cell cluster is by the unified configuration of macrocell base stations eNB.In the SRS of described CoMP UE and CoMP cooperation, other obtain the SRS quadrature of the UE of configuration.
Described SRS resource comprises: the cyclic shift of SRS basic sequence, SRS bandwidth, SRS frequency domain original position, SRS frequency hopping bandwidth and SRS user SRS period of sub-frame T
SRSWith SRS transmission biasing T
OffsetWherein SRS configures period of sub-frame T
SRSWith SRS transmission biasing T
OffsetBelong to respectively CoMP user SRS set and CoMP user SRS subset
In the SRS resource of described CoMP UE being sent to during in every secondary response CoMP request in step 604, eNB bunch, each residential quarter of CoMP cooperation, comprise persistent district and cooperation cell.
Persistent district at step 606, described CoMP UE sends to described CoMP UE with the CoMP UESRS resource distribution that receives by high-level signaling.The persistent district of described CoMP UE configures the SRS resource of the non-CoMP UE in this residential quarter voluntarily, can adopt the collocation method of prior art.The user SRS period of sub-frame T of the non-CoMP UE in this residential quarter
SRSWith user SRS transmission biasing T
OffsetThe non-CoMP user SRS subset that in belonging to bunch, eNB issues
All UE that obtain to configure of this residential quarter comprise that the SRS of described CoMP UE is mutually orthogonal.
Configure voluntarily the SRS resource of the non-CoMPUE in this residential quarter in the cooperation cell of step 607, described CoMP UE, can adopt the collocation method of prior art, the user SRS period of sub-frame T of the non-CoMP UE in this residential quarter
SRSWith user SRS transmission biasing T
OffsetBelong to the non-CoMP user SRS subset that Macro eNB issues
The SRS of the UE of all acquisition configurations of this residential quarter is mutually orthogonal, and mutually orthogonal with the SRS of described CoMP UE.
The execution sequence of above-mentioned steps 606 and step 607 in no particular order.
Send uplink detection reference signal SRS in step 608, described CoMP UE according to the SRS configuration that obtains each CoMP residential quarter in the CoMP cooperation.
SRS in step 609, the described CoMP terminal of CoMP residential quarter reception.
The SRS resource of the non-CoMP residential quarter in step 610, isomery cell cluster is configured voluntarily by this residential quarter, can adopt the collocation method of prior art.
ENB in step 611, isomery cell cluster selects suitable user class SRS set according to the CoMP residential quarter SRS configuration of this bunch CoMP residential quarter and this bunch of UE scale Dynamic Maintenance according to CoMP number of cells and UE quantity.
Further, CoMP user SRS subset and non-CoMP user SRS subset in the isomery cell cluster can be taked static configuration, also can dynamically adjust the size of corresponding CoMP user SRS subset and non-CoMP user SRS subset according to CoMP number of cells and UE quantity by eNB.
The present invention is directed to the problem of the mutual serious interference of terminal SRS in the CoMP residential quarter that occurs in the networking of present LTE isomery, propose a kind ofly to form the isomery cell cluster by macrocell base stations (Macro eNB) and small-power node (LPN), the method of unified configuration CoMP cell uplink detection reference signal SRS in bunch, the method by by bunch in the unified configuration of eNB and the SRS resource of distributing the CoMP residential quarter, realize that in the CoMP residential quarter, user SRS is mutually orthogonal, reduce the phase mutual interference of CoMP user SRS.Special the present invention has realized CoMP user and the configuration of non-CoMP user SRS diversity, can reduce and coordinate the interaction data amount that CoMP user SRS resource is distributed between the CoMP residential quarter, alleviate the CoMP technology to the bottleneck that X2 interface big data quantity transmission bandwidth requires, guaranteed the CoMP performance gain.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.
the present invention program's core technology feature: the small-power transmission node in the macrocell base stations in the LTE heterogeneous network and the area of coverage consists of the isomery cell cluster, it is that same user terminal is carried out coordinated multipoint transmission that a plurality of CoMP residential quarter in the isomery cell cluster forms the CoMP cooperation, the cell-level SRS resource of CoMP residential quarter and the user class SRS resource of CoMP UE by bunch in the unified configuration of macrocell base stations, the diversity collocation strategy is adopted in the SRS configuration of CoMP UE and non-CoMP UE, the SRS that reduces between user terminal disturbs, be that the present invention realizes CoMP UE and the CoMP UE in the cooperation cell set, CoMP UE and non-CoMP UE, the quadrature of non-CoMP UE and non-CoMP UE, improve the SINR of user SRS, reduce each residential quarter and consult the interaction data amount that the distribution of SRS resource brings, obtain better cooperative transmission effect.
Fig. 5 illustrates LTE isomery networking SRS configuration and transfer process schematic diagram in the embodiment of the present invention, comprises the steps:
When (1) the LTE system carries out the isomery networking, the small-power transmission node LPN in the macrocell base stations eNB in network and the macrocell base stations area of coverage is formed the isomery cell cluster.By eNB safeguard the residential quarter of this cell cluster form information and the notice bunch in each residential quarter.
(2) the cell-level SRS resource of the CoMP residential quarter in the isomery cell cluster is by the unified configuration of macrocell base stations eNB.The cell-level SRS resource of described CoMP residential quarter comprises: CoMP residential quarter SRS basic sequence number, CoMP residential quarter special uplink detection reference signal SRS period of sub-frame T
SFCWith CoMP residential quarter special uplink detection reference signal SRS transmission bias Δ
SFC, the user uplink detection reference signal SRS period of sub-frame T of CoMP residential quarter
SRSWith user uplink detection reference signal SRS transmission biasing T
OffsetEspecially, system is with CoMP community user SRS period of sub-frame T
SRSBe divided into a plurality of user class SRS set U
i(i=1,2 ...), and press SRS transmission biasing T
OffsetUser class SRS set is subdivided into CoMP user SRS subset
With non-CoMP user SRS subset
According to step (2), the present embodiment provides uplink detection reference signal allocation plan in a kind of bunch.This scheme comprises:
(2.1) bunch in, the SRS basic sequence of CoMP residential quarter generates according to the Cell ID of the eNB of described bunch, is prior art.
(2.2) bunch in, the SRS of COMP residential quarter sends the time offset of cycle and permission, comprises configuration cycle T
SFCWith SRS transmission bias Δ
SFC, by the unified configuration of the eNB of described bunch.But cell-level SRS cycle and transmission bias configuration use-case reference table 1.
Table 1 isomery CoMP cell-level SRS cycle and transmission bias configuration scheme
(2.3) bunch in, the CoMP user's of CoMP residential quarter uplink detection reference signal sends the time offset of cycle and permission, comprises SRS configuration cycle T
SRSWith SRS transmission biasing T
Offset, by the unified configuration of the eNB of described bunch.System is with each community user SRS period of sub-frame T
SRSBe divided into a plurality of user class SRS set U
i(i=1,2 ...), and press SRS transmission biasing T
OffsetUser class SRS set is subdivided into CoMP user SRS subset
With non-CoMP user SRS subset
CoMP user SRS subset and non-CoMP user SRS subset in the isomery cell cluster can be taked static configuration, but a user class SRS set configuration use-case reference table 2.Also can dynamically adjust the size of corresponding CoMP user SRS subset and non-CoMP user SRS subset according to CoMP number of cells and UE quantity by eNB.
Table 2 isomery CoMP community user level SRS static configuration scheme
(3) after the persistent district of CoMP UE is determined the CoMP cooperation, to bunch in eNB send the CoMP request.
(4) eNB response CoMP asks, and configures the SRS resource of described CoMP UE, and in the SRS of described COMP UE and CoMP cooperation, other obtain the SRS quadrature of the UE of configuration.Described SRS resource comprises: the cyclic shift of SRS basic sequence, SRS bandwidth, SRS frequency domain original position, SRS frequency hopping bandwidth and SRS user SRS period of sub-frame T
SRSWith SRS transmission biasing T
OffsetWherein SRS configures period of sub-frame T
SRSWith SRS transmission biasing T
OffsetBelong to respectively CoMP user SRS set and CoMP user SRS subset
(5) in eNB sends to the SRS resource of the cell-level SRS configuration of CoMP residential quarter and described CoMP UE bunch, each residential quarter of CoMP cooperation, comprise persistent district and cooperation cell.
(6) bunch in each residential quarter of CoMP cooperation is according to the cell-level SRS configuration that receives, and SRS basic sequence number, the CoMP residential quarter proprietary SRS period of sub-frame T of this residential quarter is set
SFC, the proprietary SRS in CoMP residential quarter transmission bias Δ
SFC, CoMP user class SRS gathers U
i, make with bunch in other CoMP residential quarter consistent.
(7) persistent district of described CoMP UE sends to described CoMP UE with the CoMP UE SRS resource distribution that receives by high-level signaling.The persistent district of described CoMP UE configures the SRS resource of the non-CoMP UE in this residential quarter voluntarily.The user SRS period of sub-frame T of the non-CoMP UE in this residential quarter
SRSWith user SRS transmission biasing T
OffsetThe non-CoMP user SRS subset that in belonging to bunch, eNB issues
The SRS of the UE of all acquisition configurations of this residential quarter is mutually orthogonal.
(8) cooperation cell of described CoMP UE configures the SRS resource of the non-CoMP UE in this residential quarter voluntarily, the user SRS period of sub-frame T of the non-CoMP UE in this residential quarter
SRSWith user SRS transmission biasing T
OffsetBelong to the non-CoMP user SRS subset that Macro eNB issues
The SRS of the UE of all acquisition configurations of this residential quarter is mutually orthogonal, and mutually orthogonal with the SRS of described CoMP UE.
(9) described CoMP UE sends uplink detection reference signal SRS according to the SRS configuration that obtains each CoMP residential quarter in the CoMP cooperation, and the CoMP residential quarter receives the SRS of described CoMP terminal.
(10) eNB in the isomery cell cluster according to the CoMP residential quarter SRS configuration of this bunch CoMP residential quarter and this bunch of UE scale Dynamic Maintenance, selects suitable user class SRS set according to CoMP number of cells and UE quantity.
As the conclusion to describing in detail, should notice that those skilled in the art will be apparent to make many variations and modification to preferred embodiment, and not break away from fact principle of the present invention.Within this variation and modification are included in the described scope of the present invention of appended claims.
Claims (14)
1. the method for a collocating uplink sounding reference signal comprises the following steps:
Macrocell base stations in the LTE heterogeneous network and the small-power transmission node in the area of coverage are consisted of the isomery cell cluster, the cell-level uplink detection reference signal (SRS) of CoMP cooperation in the unified configuration of macrocell base stations bunch in bunch, in the cell-level SRS configuration of CoMP residential quarter is sent to bunch, each residential quarter of CoMP cooperation, comprise persistent district and cooperation cell;
The SRS of the unified configuration of macrocell base stations CoMP UE in bunch, in the SRS of described COMP UE and CoMP cooperation, other obtain the SRS quadrature of the UE of configuration, in the SRS resource of described CoMP UE is sent to bunch, each residential quarter of CoMP cooperation, comprise persistent district and cooperation cell;
Each residential quarter of CoMP cooperation is configured according to the cell-level SRS configuration that receives;
The persistent district of described CoMP UE sends to described CoMP UE with the CoMP UE SRS resource distribution that receives by high-level signaling, the persistent district of described CoMP UE configures the SRS resource of the non-CoMP UE in this residential quarter voluntarily, and all UE that obtain to configure of this residential quarter comprise that the SRS of described CoMP UE is mutually orthogonal;
The cooperation cell of described CoMP UE configures the SRS resource of the non-CoMP UE in this residential quarter voluntarily, and the SRS of the UE of all acquisition configurations of this residential quarter is mutually orthogonal, and mutually orthogonal with the SRS of described CoMP UE.
2. the method for collocating uplink sounding reference signal according to claim 1 also comprises the step that sends uplink detection reference signal:
Described CoMP UE sends SRS according to the SRS configuration that obtains each CoMP residential quarter in the CoMP cooperation;
The CoMP residential quarter receives the SRS of described CoMP terminal.
3. the method for described collocating uplink sounding reference signal according to claim 1 and 2, allocating cell level uplink detection reference signal, further comprising the steps of:
Macrocell base stations in the isomery cell cluster is selected suitable user class SRS set according to the CoMP residential quarter SRS configuration of this bunch CoMP residential quarter and this bunch of UE scale Dynamic Maintenance according to CoMP number of cells and UE quantity.
4. the method for according to claim 1 and 2 or 3 described collocating uplink sounding reference signals, allocating cell level uplink detection reference signal comprises the following steps:
CoMP community user SRS period of sub-frame is divided into a plurality of user class SRS set, and by SRS transmission biasing, user class SRS set is subdivided into CoMP user SRS subset and non-CoMP user SRS subset.
5. the method for collocating uplink sounding reference signal according to claim 4, further comprising the steps of:
The non-CoMP user SRS subset that in the user SRS period of sub-frame of the non-CoMP UE of persistent district and user SRS transmission biasing belongs to bunch, eNB issues;
The user SRS period of sub-frame of the non-CoMP UE of cooperation cell and user SRS transmission biasing belong to the non-CoMP user SRS subset that eNB issues.
6. the method for according to claim 4 or 5 described collocating uplink sounding reference signals, further comprising the steps of:
CoMP user SRS subset and non-CoMP user SRS subset in the isomery cell cluster are taked static configuration, perhaps dynamically adjust the size of corresponding CoMP user SRS subset and non-CoMP user SRS subset according to CoMP number of cells and UE quantity.
7. the method for arbitrary described collocating uplink sounding reference signal according to claim 1 to 6, further comprising the steps of:
The SRS resource of the non-CoMP residential quarter in the isomery cell cluster is configured voluntarily by this residential quarter.
8. the small-power transmission node in the LTE heterogeneous network of a collocating uplink sounding reference signal, the macrocell base stations in the LTE heterogeneous network and the area of coverage consists of the isomery cell cluster, and described LTE heterogeneous network comprises:
The cell-level uplink detection reference signal (SRS) of CoMP cooperation in base station, unified configuration bunch, the SRS configuration of unified configuration CoMP UE; In the SRS of the cell-level SRS of CoMP residential quarter and CoMP UE is sent to bunch, each residential quarter of CoMP cooperation, comprise persistent district and cooperation cell, and in the SRS of described COMP UE and CoMP cooperation, other obtain the SRS quadrature of the UE of configuration;
CoMP UE persistent district, be configured according to the cell-level SRS configuration that receives, the CoMP UE SRS resource distribution that receives is sent to described CoMPUE by high-level signaling, described CoMP UE persistent district configures the SRS resource of the non-CoMP UE in this residential quarter voluntarily, and all UE that obtain to configure of this residential quarter comprise that the SRS of described CoMP UE is mutually orthogonal;
CoMP UE cooperation cell is configured according to the cell-level SRS configuration that receives, and configures voluntarily the SRS resource of the non-CoMP UE in this residential quarter, and the SRS of the UE of all acquisition configurations of this residential quarter is mutually orthogonal, and mutually orthogonal with the SRS of described CoMP UE.
9. the LTE heterogeneous network of collocating uplink sounding reference signal according to claim 8, wherein:
Described CoMP UE persistent district and CoMP UE cooperation cell also receive the SRS that described CoMP terminal sends.
10. the LTE heterogeneous network of according to claim 8 or 9 described collocating uplink sounding reference signals, wherein:
Described base station is selected suitable user class SRS set according to the CoMP residential quarter SRS configuration of this bunch CoMP residential quarter and this bunch of UE scale Dynamic Maintenance according to CoMP number of cells and UE quantity.
11. the LTE heterogeneous network of according to claim 8 or 9 or 10 described collocating uplink sounding reference signals, wherein:
Described base station is divided into a plurality of user class SRS set with CoMP community user SRS period of sub-frame, and by SRS transmission biasing, user class SRS set is subdivided into CoMP user SRS subset and non-CoMP user SRS subset.
12. the LTE heterogeneous network of described collocating uplink sounding reference signal according to claim 11, wherein:
The non-CoMP user SRS subset that in the user SRS period of sub-frame of the non-CoMP UE of described CoMP UE persistent district and user SRS transmission biasing belongs to bunch, eNB issues;
The user SRS period of sub-frame of the non-CoMP UE of described CoMP UE cooperation cell and user SRS transmission biasing belong to the non-CoMP user SRS subset that eNB issues.
13. the LTE heterogeneous network of according to claim 11 or 12 described collocating uplink sounding reference signals, wherein:
CoMP user SRS subset and non-CoMP user SRS subset in the isomery cell cluster are taked static configuration, perhaps dynamically adjust the size of corresponding CoMP user SRS subset and non-CoMP user SRS subset according to CoMP number of cells and UE quantity.
14. the LTE heterogeneous network of arbitrary described collocating uplink sounding reference signal according to claim 8 to 13, wherein:
The SRS resource of the non-CoMP residential quarter in the isomery cell cluster is configured voluntarily by this residential quarter.
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