CN101938299A - Method and device for determining joint transmission cells - Google Patents

Abstract

The embodiment of the invention discloses a method and a device for determining joint transmission cells, belonging to the field of network communication. The method comprises the following steps of: acquiring the signal to interference plus noise ratio (SINR) of a signal received by user equipment (UE) according to the channel status information (CSI) of each cell in a report set sent by the UE, and selecting the cells with the SINR reaching a preset threshold into a cooperation set; and negotiating with each cell in the cooperation set, and determining the cells successfully negotiated as the joint transmission cells. The device comprises a selection module and a negotiation module. The technical scheme provided by the embodiment can be used for predicting transmission interference from surrounding cells so as to ensure that sufficient SINR is provided to the UE.

Description

The method and apparatus of a kind of definite joint transmission sub-district

Technical field

The present invention relates to network communication field, the method and apparatus of particularly a kind of definite joint transmission sub-district.

Background technology

LTE (Long Term Evolution, Long Term Evolution)/LTE-A is counted as the most competitive accurate 4G communication standard gradually, EMBMS (Enhanced Multimedia Broadcast/Multicast Service, the enhanced multimedia broadcast business) is the important service that 3GPP organizes the LTE/LTE-A of proposition must support by mobile communication system, such as mobile TV, purpose is for the LTE network provides more effective mode, so that multimedia messages is sent to each LTE terminal with multicast or broadcast mode.In order to improve the spectrum efficiency of edge customer, the LTE system has introduced by many base station cooperations and has been transmitted as CoMP (the Coordinated multi-point Transmission that single UE serves, the multipoint cooperative transmission) technology, this CoMP technology not only adds antenna on original website, and increases some new websites.

At present, CoMP designs in unicast sub in the LTE-A system, for example, utilize RSRP (reference signal received power, Reference Signal Received Power) measures signal strength signal intensity RSSI (the Received Signal Strength Indicator of a plurality of base stations arrival UE on every side, receive channel intensity), select the joint transmission sub-district according to RSSI, but because there is multiple MIMO (Multiple-Input Multiple-Out-put in the eNodeB clean culture, multiple-input and multiple-output) pattern, the unicast transmission of peripheral cell is disturbed and can't be predicted, under the situation that can't predict interference, can't determine whether the joint transmission sub-district of selecting is enough to provide enough SINR (Signal to Interference andNoise Ratio, Signal to Interference plus Noise Ratio) to UE.

Summary of the invention

Can give the LTE-A system for the joint transmission sub-district that guarantees to select enough SINR are provided, the embodiment of the invention provides the method and apparatus of a kind of definite joint transmission sub-district.Described technical scheme is as follows:

The embodiment of the invention provides the method for a kind of definite joint transmission sub-district, and described method comprises:

According to the channel condition information CSI that reports each sub-district in the set that user equipment (UE) sends, obtain the Signal to Interference plus Noise Ratio SINR of UE received signal, with make described SINR reach predetermined threshold value the sub-district select into cooperation set;

Hold consultation with each sub-district in the described cooperation set, a plurality of sub-districts of consulting successfully are defined as the joint transmission sub-district.

The embodiment of the invention provides the method for a kind of definite joint transmission sub-district, and described method comprises:

According to the channel condition information CSI that reports each sub-district in the set that user equipment (UE) sends, obtain the Signal to Interference plus Noise Ratio SINR of UE received signal, with make described SINR reach predetermined threshold value the sub-district select into cooperation set;

Described cooperation set is reported multipoint cooperative transmission CoMP scheduler, described CoMP scheduler is dispatched each sub-district in the described cooperation set, determine the joint transmission sub-district.

The embodiment of the invention provides the device of a kind of definite joint transmission sub-district, and described device comprises: select module and negotiation module;

Described selection module is used for the channel condition information CSI that reports each sub-district of set that sends according to user equipment (UE), obtains the Signal to Interference plus Noise Ratio SINR of UE received signal, with make described SINR reach predetermined threshold value the sub-district select into cooperation set;

Described negotiation module is used for holding consultation with each sub-district of described cooperation set, and a plurality of sub-districts of consulting successfully are defined as the joint transmission sub-district.

The embodiment of the invention provides the device of a kind of definite joint transmission sub-district, and described device comprises: processing module and multipoint cooperative transmission CoMP scheduler;

Described processing module is used for the channel condition information CSI that reports each sub-district of set that sends according to user equipment (UE), obtains the Signal to Interference plus Noise Ratio SINR of UE received signal, with make described SINR reach predetermined threshold value the sub-district select into cooperation set; And described cooperation set reported described CoMP scheduler;

Described CoMP scheduler is used for each sub-district of described cooperation set is dispatched, and is defined as the joint transmission sub-district.

The beneficial effect of the technical scheme that the embodiment of the invention provides is: according to the CSI that reports each sub-district in the set of UE transmission, obtain the SINR of UE received signal, with make SINR reach predetermined threshold value the sub-district select into cooperation set, after consulting with the sub-district in the cooperation set, determine the joint transmission sub-district, so that in default MBSFN subframe, dispose under the situation of PDSCH subframe, the CoMP joint transmission just can be carried out in Serving cell and this joint transmission sub-district in a plurality of MBSFN subframes, therefore can predict from the transmission of peripheral cell and disturb, ensure to UE enough SINR are provided.

Description of drawings

Fig. 1 is the method flow schematic diagram of definite joint transmission sub-district of providing of the embodiment of the invention 1;

Fig. 2 is the method flow schematic diagram of definite joint transmission sub-district of providing of the embodiment of the invention 2;

Fig. 3 is the apparatus structure schematic diagram of definite joint transmission sub-district of providing of the embodiment of the invention 3;

Fig. 4 is the apparatus structure schematic diagram of definite joint transmission sub-district of providing of the embodiment of the invention 4.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.

Embodiment 1

Referring to Fig. 1, the embodiment of the invention provides the method for a kind of definite joint transmission sub-district, and this method comprises:

101: according to the CSI that reports each sub-district in the set (the Channel State Information of UE transmission, channel condition information), obtain the Signal to Interference plus Noise Ratio SINR of UE received signal, with the SINR that makes the UE received signal reach predetermined threshold value the sub-district select into cooperation set;

Concrete, just begun to have only Serving cell to provide service to UE, and report the sub-district in the set to be used for disposing PMCH (Physical Multicast Channel, Physical Multicast Channel) carries out unicast transmission, at first the CSI that sends according to UE will report and disturb the strongest sub-district to select into cooperation set in the set, whether the SINR that calculates the signal that UE receives then reaches predetermined threshold value, if not, then will report the strongest sub-district of interference that does not have choosing to advance the cooperation set in the set to select into cooperation set according to CSI again, and then whether the SINR that calculates the signal that UE receives reaches predetermined threshold value, so circulation is till the SINR that calculates the signal that UE receives reaches predetermined threshold value.

For example, if UE can obtain CSI by the pilot signal of a plurality of sub-districts, choose the strongest sub-district of interference one by one, just choose the strongest sub-district of pilot signal, if the sub-district that pilot signal is the strongest is strong1, strong2, with strong1, strong2 selects into cooperation set, determine that the strongest sub-district of pilot signal can be by the channel H between UE and each base station, obtain covariance matrix R, for example, for the 2*2 aerial array:

$R=\left[\begin{array}{cc}{R}_{11}& R_{12}\\ R_{21}& R_{22}\end{array}\right]$

Wherein, diagonal entry has just been represented the RSSI of the pilot signal of antenna 1 and antenna 2 correspondences, and RSSI is big more, just illustrates that pilot signal is the strongest.

If i UE can predict high reject signal is become SINR value behind the cooperation sub-district, can calculate the SINR value by following formula:

${\mathrm{SINR}}_i=\frac{{\left|\right|H_i{w}_i\left|\right|}^2+{\left|\right|H_{\mathrm{strong}1}{w}_{\mathrm{strong}1}\left|\right|}^2+{\left|\right|H_{\mathrm{strong}2}{w}_{\mathrm{strong}2}\left|\right|}^2+...}{N_R\mathrm{\ρ}+{\mathrm{\Σ}}_{k\≠i}{\left|\right|H_k\left|\right|}^2-{\left|\right|H_{\mathrm{strong}1}\left|\right|}^2-{\left|\right|H_{\mathrm{strong}2}\left|\right|}^2-...}$

In the formula, ρ is a noise power, N _RIt is the reception antenna number.Hi represents the channel between i UE and serving BS, w _iExpression channel H _iCorresponding precoding vector, H _Strong1Expression disturbs the strongest sub-district strong1 to the channel between the UE i, w to UE i _Strong1Be H _Strong1Corresponding precoding vector, can with w _iThe same, also can be different, H _Strong2Expression disturbs the strongest sub-district strong2 to the channel between the UE i, w to UE i _Strong2Be its corresponding precoding vector, can with w _iThe same, also can be different.

In the present embodiment, the final cooperation set of determining can be the subclass of SFN (Single Frequency Network, single frequency network) sub-district or SFN sub-district.

102: hold consultation with each sub-district in the cooperation set, be defined as the joint transmission sub-district with consulting successful sub-district.

In the present embodiment, hold consultation in the loading condition of each sub-district in can gathering in conjunction with lock in time, the cooperation of each sub-district in Serving cell and the cooperation set and each sub-district in this cooperation set, such as, first sub-district and Serving cell time synchronized in the cooperation set, and when this first cell load was not very heavy, this first sub-district just can participate in joint transmission.

For example, there is the A sub-district sub-district that choosing is advanced in the cooperation set, B sub-district and C sub-district, and after holding consultation with these three sub-districts, the B sub-district can not participate in joint transmission because load is heavier, therefore, consults successful A sub-district and C sub-district and just can be used as the joint transmission sub-district; If in these three sub-districts, the asynchronism(-nization) of A sub-district and Serving cell goes on foot, and the load of B sub-district is very heavy, then consult successfully have only the C sub-district.

Wherein, before holding consultation in each sub-district in gathering with cooperation, this method can also comprise:

Each sub-district in the notice cooperation set is all known the selected sub-district of advancing the cooperation set and self is selected into the cooperation set, and data that will the UE of giving to be sent send to cooperation each sub-district in gathering.

Wherein, this method can also comprise:

Default MBSFN (the Multicast Broadcast Single Frequency Network in each sub-district in Serving cell and joint transmission sub-district, when Multicast Broadcast Single Frequency Network) configuration PDSCH carries out unicast transmission on the subframe, carry out the CoMP joint transmission in a plurality of MBSFN subframes in Serving cell and joint transmission sub-district of Serving cell and this joint transmission sub-district.

In LTE and LTE-A and the system that deposits, because the MBSFN subframe is supported the LTE-APDSCH transmission, this MBSFN subframe also just becomes the special-purpose subframe of LTE-A clean culture, therefore can dispose the LTE-A unicast sub separately, has saved resource, and has guaranteed compatibility.

And in unicast sub, carry out at present CoMP and be primarily aimed at the single subdistrict design, its frame structure adopts normal (Normal) CP, like this with regard to existing since the signal that send a plurality of sub-districts to arrive the time of identical UE inconsistent, even might exceed the length of normal CP, thereby introduce ICI (Inter carrierl Interference, inter-carrier interference) and ISI (Inter symbol interference, intersymbol interference).And in the MBSFN subframe, carry out CoMP, because the MBSFN subframe structure adopts expansion CP, make the energy window of UE received signal enlarge greatly, and it is very low to exceed the interference signal energy of expanding CP, thereby has improved the signal quality that edge customer receives.

Wherein, before the step 101, this method also comprises:

To UE notice RRM (Radio Resource Management, RRM) set, and receive the RSRP of each sub-district correspondence in the RRM set that UE measures;

The RSRP corresponding district that will be higher than predetermined threshold value is defined as the CoMP measuring assembly, and the CoMP measuring assembly of determining is notified to UE, makes UE select to report set in the CoMP measuring assembly.

In the present embodiment, the CoMP measuring assembly can be the subclass of SFN set or SFN set.

In the present embodiment, Serving cell can be the sub-district of base station services, also can be the sub-district of RRU (Remote RF Unit, remote radio unit (RRU)) service.

The beneficial effect of the embodiment of the invention is: according to the CSI that reports each sub-district in the set of UE transmission, obtain the SINR of UE received signal, with the SINR that makes the UE received signal reach predetermined threshold value the sub-district select into cooperation set, after consulting with the sub-district in the cooperation set, determine the joint transmission sub-district, so that in default MBSFN subframe, dispose under the situation of PDSCH subframe, the CoMP joint transmission just can be carried out in Serving cell and this joint transmission sub-district in a plurality of MBSFN subframes, therefore can predict from the transmission of peripheral cell and disturb, ensure to UE enough SINR are provided; And because the MBSFN subframe structure adopts expansion CP, make the energy window of UE received signal enlarge greatly, and it is very low to exceed the interference signal energy of expanding CP, thereby has improved the signal quality that edge customer receives.

Embodiment 2

Referring to Fig. 2, the embodiment of the invention provides the method for a kind of definite joint transmission sub-district, and this method comprises:

201: according to the CSI that reports each sub-district in the set that UE sends, obtain the Signal to Interference plus Noise Ratio SINR of UE received signal, with the SINR that makes the UE received signal reach predetermined threshold value the sub-district select into cooperation set;

Concrete, just begun to have only Serving cell to provide service to UE, carry out unicast transmission and report sub-district in the set to be used for disposing PMCH (Physical Multicast Channel, Physical Multicast Channel); At first the CSI that sends according to UE will report and disturb the strongest sub-district to select into cooperation set in the set, whether the SINR that calculates the signal that UE receives then reaches predetermined threshold value, if not, then will report the strongest sub-district of interference that does not have choosing to advance the cooperation set in the set to select into cooperation set according to CSI again, and then whether the SINR that calculates the signal that UE receives reaches predetermined threshold value, so circulation is till the SINR that calculates the signal that UE receives reaches predetermined threshold value.

For example, if UE can obtain CSI by the pilot signal of a plurality of sub-districts, choose the strongest sub-district of interference one by one, just choose the strongest sub-district of pilot signal, if the sub-district that pilot signal is the strongest is strong1, strong2, with strong1, strong2 selects into cooperation set, determine that the strongest sub-district of pilot signal can be by the channel H between UE and each base station, obtain covariance matrix R, for example, for the 2*2 aerial array:

$R=\left[\begin{array}{cc}{R}_{11}& R_{12}\\ R_{21}& R_{22}\end{array}\right]$

Wherein, diagonal entry has just been represented the RSSI of the pilot signal of antenna 1 and antenna 2 correspondences, and RSSI is big more, just illustrates that pilot signal is the strongest.

If i UE can predict high reject signal is become SINR value behind the cooperation sub-district, can calculate the SINR value by following formula:

${\mathrm{SINR}}_i=\frac{{\left|\right|H_i{w}_i\left|\right|}^2+{\left|\right|H_{\mathrm{strong}1}{w}_{\mathrm{strong}1}\left|\right|}^2+{\left|\right|H_{\mathrm{strong}2}{w}_{\mathrm{strong}2}\left|\right|}^2+...}{N_R\mathrm{\ρ}+{\mathrm{\Σ}}_{k\≠i}{\left|\right|H_k\left|\right|}^2-{\left|\right|H_{\mathrm{strong}1}\left|\right|}^2-{\left|\right|H_{\mathrm{strong}2}\left|\right|}^2-...}$

In the formula, ρ is a noise power, N _RIt is the reception antenna number.Hi represents the channel between i UE and serving BS, w _iExpression channel H _iCorresponding precoding vector, H _Strong1Expression disturbs the strongest sub-district strong1 to the channel between the UE i, w to UE i _Strong1Be H _Strong1Corresponding precoding vector, can with w _iThe same, also can be different, H _Strong2Expression disturbs the strongest sub-district strong2 to the channel between the UE i, w to UE i _Strong2Be its corresponding precoding vector, can with w _iThe same, also can be different.

In the present embodiment, the final cooperation set of determining can be the subclass of SFN sub-district or SFN sub-district.

202: this cooperation set is reported the CoMP scheduler, the CoMP scheduler is dispatched each sub-district in this cooperation set, the successful sub-district of scheduling is defined as the joint transmission sub-district.

In the present embodiment, dispatch the loading condition of each sub-district during the CoMP scheduler can be gathered in conjunction with lock in time, the cooperation of each sub-district in Serving cell and the cooperation set and each sub-district in this cooperation set, such as, first sub-district and Serving cell time synchronized in the cooperation set, and when this first cell load was not very heavy, this first sub-district just can participate in joint transmission.

For example, there is the A sub-district sub-district that is selected in the cooperation set, B sub-district and C sub-district, after the CoMP scheduler was dispatched these three sub-districts, the B sub-district can not participate in joint transmission because load is heavier, therefore, successful A sub-district and the C sub-district of scheduling just can be used as the joint transmission sub-district; If in these three sub-districts, the asynchronism(-nization) of A sub-district and Serving cell step, and the load of B sub-district is very heavy, the cell scheduling success during then the CoMP scheduler is gathered cooperation have only the C sub-district.

For the MBSFN subframe, the CoMP scheduler can be shared same equipment entity with the scheduler MCE (MBMS coordination entity, broadcasting and multicast coordination element) of SFN, also can be respectively different equipment entity.

Wherein, before this cooperation set was reported the CoMP scheduler, this method can also comprise:

Each sub-district in the notice cooperation set is all known the selected sub-district of advancing the cooperation set and self is selected into the cooperation set, and data that will the UE of giving to be sent send to cooperation each sub-district in gathering.

Wherein, this method can also comprise:

When disposing the PDSCH subframe on the MBSFN subframe that preset each sub-district in Serving cell and joint transmission sub-district, the CoMP joint transmission just can be carried out in a plurality of MBSFN subframes in Serving cell and joint transmission sub-district in Serving cell and this joint transmission sub-district.

In unicast sub, carry out at present CoMP and be primarily aimed at the single subdistrict design, its frame structure adopts normal CP, like this with regard to existing since the signal that send a plurality of sub-districts to arrive the time of identical UE inconsistent, even might exceed the length of normal CP, thereby introduce ICI and ISI.And in the MBSFN subframe, carry out CoMP, because the MBSFN subframe structure adopts expansion CP, make the energy window of UE received signal enlarge greatly, and it is very low to exceed the interference signal energy of expanding CP, thereby has improved the signal quality that edge customer receives.

Wherein, before the step 201, this method also comprises:

To UE notice RRM set, and receive the RSRP of each sub-district correspondence in the RRM set that UE measures;

The RSRP corresponding district that will be higher than predetermined threshold value is defined as the CoMP measuring assembly, and the CoMP measuring assembly of determining is notified to UE, makes UE select to report set in the CoMP measuring assembly.

In the present embodiment, the CoMP measuring assembly can be the subclass of SFN set or SFN set.

In the present embodiment, Serving cell can be the sub-district of base station services, also can be the sub-district of RRU service.

The beneficial effect of the embodiment of the invention is: according to the CSI that reports each sub-district in the set of UE transmission, obtain the SINR of UE received signal, with the SINR that makes the UE received signal reach predetermined threshold value the sub-district select into cooperation set, after sub-district in the cooperation set dispatched, determine the joint transmission sub-district, so that in default MBSFN subframe, dispose under the situation of PDSCH subframe, the CoMP joint transmission just can be carried out in Serving cell and this joint transmission sub-district in a plurality of MBSFN subframes, therefore can predict from the transmission of peripheral cell and disturb, ensure to UE enough SINR are provided; And because the MBSFN subframe structure adopts expansion CP, make the energy window of UE received signal enlarge greatly, and it is very low to exceed the interference signal energy of expanding CP, thereby has improved the signal quality that edge customer receives.

Embodiment 3

Referring to Fig. 3, the embodiment of the invention provides the device of a kind of definite joint transmission sub-district, and this device comprises: select module 301 and negotiation module 302;

Select module 301, be used for the CSI that reports each sub-district of set that sends according to UE, obtain the Signal to Interference plus Noise Ratio SINR of UE received signal, with the SINR that makes the UE received signal reach predetermined threshold value the sub-district select into cooperation set;

Concrete, the sub-district that has just begun to have only this device to serve provides service to UE, carries out unicast transmission and report sub-district in the set to be used for disposing PMCH; At first the CSI that sends according to UE will report and disturb the strongest sub-district to select into cooperation set in the set, whether the SINR that calculates the signal that UE receives then reaches predetermined threshold value, if not, then will report the strongest sub-district of interference that does not have choosing to advance the cooperation set in the set to select into cooperation set according to CSI again, and then whether the SINR that calculates the signal that UE receives reaches predetermined threshold value, so circulation is till the SINR that calculates the signal that UE receives reaches predetermined threshold value.

For example, if UE can obtain CSI by the pilot signal of a plurality of sub-districts, choose the strongest sub-district of interference one by one, just choose the strongest sub-district of pilot signal, if the sub-district that pilot signal is the strongest is strong1, strong2, with strong1, strong2 selects into cooperation set, determine that the strongest sub-district of pilot signal can be by the channel H between UE and each base station, obtain covariance matrix R, for example, for the 2*2 aerial array:

$R=\left[\begin{array}{cc}{R}_{11}& R_{12}\\ R_{21}& R_{22}\end{array}\right]$

Wherein, diagonal entry has just been represented the RSSI of the pilot signal of antenna 1 and antenna 2 correspondences, and RSSI is big more, just illustrates that pilot signal is the strongest.

If i UE can predict high reject signal is become SINR value behind the cooperation sub-district, can calculate the SINR value by following formula:

${\mathrm{SINR}}_i=\frac{{\left|\right|H_i{w}_i\left|\right|}^2+{\left|\right|H_{\mathrm{strong}1}{w}_{\mathrm{strong}1}\left|\right|}^2+{\left|\right|H_{\mathrm{strong}2}{w}_{\mathrm{strong}2}\left|\right|}^2+...}{N_R\mathrm{\ρ}+{\mathrm{\Σ}}_{k\≠i}{\left|\right|H_k\left|\right|}^2-{\left|\right|H_{\mathrm{strong}1}\left|\right|}^2-{\left|\right|H_{\mathrm{strong}2}\left|\right|}^2-...}$

In the formula, ρ is a noise power, N _RIt is the reception antenna number.H _iRepresent the channel between i UE and serving BS, w _iExpression channel H _iCorresponding precoding vector, H _Strong1Expression disturbs the strongest sub-district strong1 to the channel between the UE i, w to UE i _Strong1Be H _Strong1Corresponding precoding vector, can with w _iThe same, also can be different, H _Strong2Expression disturbs the strongest sub-district strong2 to the channel between the UE i, w to UE i _Strong2Be its corresponding precoding vector, can with w _iThe same, also can be different.

In the present embodiment, the final cooperation set of determining can be the subclass of SFN sub-district or SFN sub-district.

Negotiation module 302 is used for holding consultation with each sub-district of cooperation set, is defined as the joint transmission sub-district with consulting successful sub-district.

In the present embodiment, hold consultation in each sub-district during negotiation module 302 can be gathered in conjunction with the lock in time of each sub-district in the sub-district of this device service and the cooperation set, the loading condition of each sub-district in the cooperation set and this cooperation, such as, the sub-district time synchronized of first sub-district in the cooperation set and this device service, and when this first cell load was not very heavy, this first sub-district just can participate in joint transmission.

For example, there is the A sub-district sub-district of selecting module 301 to be selected in the cooperation set, and B sub-district and C sub-district are after negotiation module 302 is held consultation with these three sub-districts, the B sub-district is because load is heavier, can not participate in joint transmission, therefore, consult successful A sub-district and C sub-district and just can be used as the joint transmission sub-district, if in these three sub-districts, sub-district asynchronism(-nization) step of A sub-district and this device service, and the load of B sub-district is very heavy, then negotiation module 302 and the sub-district in the cooperation set consult successfully have only the C sub-district.

Wherein, this device can also comprise: sending module 303, be used for notifying each sub-district of cooperation set, the selected sub-district of advancing the cooperation set all known self be selected into the cooperation set, and data that will the UE of giving to be sent send to cooperation each sub-district in gathering;

Wherein, in the sub-district of this device service and joint transmission sub-district on the default MBSFN subframe in each sub-district during configuration PDSCH subframe, the sub-district that this device is served and this joint transmission sub-district just can a plurality of MBSFN subframes in carry out the CoMP joint transmission.

In LTE and LTE-A and the system that deposits, because the MBSFN subframe is supported LTE-A PDSCH transmission, this MBSFN subframe also just becomes the special-purpose subframe of LTE-A clean culture, therefore can dispose the LTE-A unicast sub separately, has saved resource, and has guaranteed compatibility.

And in unicast sub, carry out at present CoMP and be primarily aimed at the single subdistrict design, its frame structure adopts normal CP, like this with regard to existing since the signal that send a plurality of sub-districts to arrive the time of identical UE inconsistent, even might exceed the length of normal CP, thereby introduce ICI and ISI.And in the MBSFN subframe, carry out CoMP, because the MBSFN subframe structure adopts expansion CP, make the energy window of UE received signal enlarge greatly, and it is very low to exceed the interference signal energy of expanding CP, thereby has improved the signal quality that edge customer receives.

Wherein, this device can also comprise: receiver module 304 and determination module 305;

Receiver module 304 is used for the set to UE notice RRM, and receives the RSRP of each sub-district correspondence in the RRM set that UE measures;

Determination module 305, the RSRP corresponding district that is used for being higher than predetermined threshold value is defined as the CoMP measuring assembly, and the CoMP measuring assembly of determining is notified to UE, makes UE select to report set in the CoMP measuring assembly.

In the present embodiment, the CoMP measuring assembly can be the subclass of SFN set or SFN set.

In the present embodiment, this device can be the base station, also can be RRU.

The beneficial effect of the embodiment of the invention is: the CSI that reports each sub-district in the set that selects module 301 to send according to UE, obtain the SINR of UE received signal, with the SINR that makes the UE received signal reach predetermined threshold value the sub-district select into cooperation set, after negotiation module 302 is consulted with the sub-district in the cooperation set, determine the joint transmission sub-district, so that in default MBSFN subframe, dispose under the situation of PDSCH subframe, the CoMP joint transmission just can be carried out in sub-district and this joint transmission sub-district of this device service in a plurality of MBSFN subframes, therefore can predict from the transmission of peripheral cell and disturb, ensure to UE enough SINR are provided; And because the MBSFN subframe structure adopts expansion CP, make the energy window of UE received signal enlarge greatly, and it is very low to exceed the interference signal energy of expanding CP, thereby has improved the signal quality that edge customer receives.

Embodiment 4

Referring to Fig. 4, the embodiment of the invention provides the device of a kind of definite joint transmission sub-district, and this device comprises: processing module 401 and CoMP scheduler 402;

Processing module 401 is used for the CSI that reports each sub-district of set that sends according to UE, obtains the Signal to Interference plus Noise Ratio SINR of UE received signal, with the SINR that makes the UE received signal reach predetermined threshold value the sub-district select into cooperation set; And this cooperation set reported CoMP scheduler 402;

Concrete, just begun to have only the sub-district of processing module 401 services to provide service to UE, carry out unicast transmission and report sub-district in the set to be used for disposing PMCH; At first the CSI that sends according to UE will report and disturb the strongest sub-district to select into cooperation set in the set, whether the SINR that calculates the signal that UE receives then reaches predetermined threshold value, if not, then will report the strongest sub-district of interference that does not have choosing to advance the cooperation set in the set to select into cooperation set according to CSI again, and then whether the SINR that calculates the signal that UE receives reaches predetermined threshold value, so circulation is till the SINR that calculates the signal that UE receives reaches predetermined threshold value.

For example, if UE can obtain CSI by the pilot signal of a plurality of sub-districts, choose the strongest sub-district of interference one by one, just choose the strongest sub-district of pilot signal, if the sub-district that pilot signal is the strongest is strong1, strong2, with strong1, strong2 selects into cooperation set, determine that the strongest sub-district of pilot signal can be by the channel H between UE and each base station, obtain covariance matrix R, for example, for the 2*2 aerial array:

$R=\left[\begin{array}{cc}{R}_{11}& R_{12}\\ R_{21}& R_{22}\end{array}\right]$

Wherein, diagonal entry has just been represented the RSSI of the pilot signal of antenna 1 and antenna 2 correspondences, and RSSI is big more, just illustrates that pilot signal is the strongest.

If i UE can predict high reject signal is become SINR value behind the cooperation sub-district, can calculate the SINR value by following formula:

${\mathrm{SINR}}_i=\frac{{\left|\right|H_i{w}_i\left|\right|}^2+{\left|\right|H_{\mathrm{strong}1}{w}_{\mathrm{strong}1}\left|\right|}^2+{\left|\right|H_{\mathrm{strong}2}{w}_{\mathrm{strong}2}\left|\right|}^2+...}{N_R\mathrm{\ρ}+{\mathrm{\Σ}}_{k\≠i}{\left|\right|H_k\left|\right|}^2-{\left|\right|H_{\mathrm{strong}1}\left|\right|}^2-{\left|\right|H_{\mathrm{strong}2}\left|\right|}^2-...}$

In the formula, ρ is a noise power, N _RIt is the reception antenna number.H _iRepresent the channel between i UE and serving BS, w _iExpression channel H _iCorresponding precoding vector, H _Strong1Expression disturbs the strongest sub-district strong1 to the channel between the UE i, w to UE i _Strong1Be H _Strong1Corresponding precoding vector, can with w _iThe same, also can be different, H _Strong2Expression disturbs the strongest sub-district strong2 to the channel between the UE i, w to UE i _Strong2Be its corresponding precoding vector, can with w _iThe same, also can be different.

In the present embodiment, the final cooperation set of determining can be the subclass of SFN sub-district or SFN sub-district.

CoMP scheduler 402 is used for each sub-district of this cooperation set is dispatched, and the successful sub-district of scheduling is defined as the joint transmission sub-district; Also be used for notifying each sub-district of cooperation set, the selected sub-district of advancing the cooperation set known self be selected into the cooperation set, and data that will the UE of giving to be sent send to cooperation each sub-district in gathering.

In the present embodiment, the lock in time of each sub-district during CoMP scheduler 402 can be gathered with cooperation in conjunction with the sub-district of processing module 401 service, the loading condition of each sub-district in the cooperation set is dispatched each sub-district in the cooperation set, such as, the sub-district time synchronized of first sub-district in the cooperation set and processing module 401 services, and when this first cell load was not very heavy, this first sub-district just can participate in joint transmission.

For example, there is the A sub-district sub-district that processing module 401 is selected in the cooperation set, B sub-district and C sub-district, after processing module 401 is held consultation with these three sub-districts, the B sub-district is because load is heavier, can not participate in joint transmission, therefore, dispatch successful A sub-district and C sub-district and just can be used as the joint transmission sub-district, if in these three sub-districts, sub-district asynchronism(-nization) step of A sub-district and processing module 401 services, and the load of B sub-district is very heavy, then the CoMP scheduler has only the C sub-district to the cell scheduling success in the cooperation set.

For the MBSFN subframe, CoMP scheduler 402 can be shared same equipment entity with the scheduler MCE of SFN, also can be respectively different equipment entity.

In the present embodiment, in the sub-district of processing module 401 service and joint transmission sub-district on the default MBSFN subframe in each sub-district during configuration PDSCH subframe, the CoMP joint transmission just can be carried out in the joint transmission sub-district that the sub-district of processing module 401 services and CoMP scheduler 402 are determined in sub-district that processing module 401 is served and a plurality of MBSFN subframes in the joint transmission sub-district.

In LTE and LTE-A and the system that deposits, because the MBSFN subframe is supported LTE-A PDSCH transmission, this MBSFN subframe also just becomes the special-purpose subframe of LTE-A clean culture, therefore can dispose the LTE-A unicast sub separately, has saved resource, and has guaranteed compatibility.

In unicast sub, carry out at present CoMP and be primarily aimed at the single subdistrict design, its frame structure adopts normal CP, like this with regard to existing since the signal that send a plurality of sub-districts to arrive the time of identical UE inconsistent, even might exceed the length of normal CP, thereby introduce ICI and ISI.And in the MBSFN subframe, carry out CoMP, because the MBSFN subframe structure adopts expansion CP, make the energy window of UE received signal enlarge greatly, and it is very low to exceed the interference signal energy of expanding CP, thereby has improved the signal quality that edge customer receives.

Wherein, this device can also comprise: UE403,

Accordingly, processing module 401 also is used for the set to UE403 notice RRM;

UE403 after the notice that receives the RRM set that processing module 401 sends, the RSRP of each sub-district correspondence in the measure R RM set, and the RSRP of each the sub-district correspondence in the RRM measuring assembly of measuring sent to processing module 401;

Accordingly, processing module 401 also is used for behind the RSRP of each the sub-district correspondence of RRM set that receives the UE403 transmission, and the RSRP corresponding district that will be higher than predetermined threshold value is defined as the CoMP measuring assembly, and the CoMP measuring assembly of determining is notified to UE403;

UE403 is after receiving the CoMP measuring assembly notice that processing module 401 is determined, the CSI of each sub-district in the CoMP measuring assembly that measurement process module 401 is determined, CSI according to each sub-district in the CoMP measuring assembly selects to report set in the CoMP measuring assembly, and this is reported the CSI of each sub-district sends to processing module 401 in the set.

Concrete, UE403 selects each minizone channel relevancy to be lower than the sub-district of predetermined threshold value in the CoMP measuring assembly according to the CSI that reports each sub-district in the set, and each minizone channel relevancy is called less than the sub-district of predetermined threshold value and reports set in the CoMP measuring assembly.

In the present embodiment, the CoMP measuring assembly can be the subclass of SFN set or SFN set.

In the present embodiment, processing module 401 can be the base station, also can be RRU.

The beneficial effect of the embodiment of the invention is: according to the CSI that reports each sub-district in the set of UE transmission, obtain the SINR of UE received signal, with the SINR that makes the UE received signal reach predetermined threshold value the sub-district select into cooperation set, behind the cell scheduling in the cooperation set, determine the joint transmission sub-district, so that in default MBSFN subframe, dispose under the situation of PDSCH subframe, the CoMP joint transmission just can be carried out in sub-district and this joint transmission sub-district of processing module 401 services in a plurality of MBSFN subframes, therefore can predict from the transmission of peripheral cell and disturb, ensure to UE enough SINR are provided; And because the MBSFN subframe structure adopts expansion CP, make the energy window of UE received signal enlarge greatly, and it is very low to exceed the interference signal energy of expanding CP, thereby has improved the signal quality that edge customer receives.

The embodiment of the invention can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, for example, and in the hard disk of computer, buffer memory or the CD.

The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (17)

1. the method for definite joint transmission sub-district is characterized in that, described method comprises:

According to the channel condition information CSI that reports each sub-district in the set that user equipment (UE) sends, obtain the Signal to Interference plus Noise Ratio SINR of UE received signal, into cooperation set is selected in the sub-district that makes described SINR reach predetermined threshold value;

Hold consultation with each sub-district in the described cooperation set, be defined as the joint transmission sub-district consulting successful sub-district.

2. method according to claim 1 is characterized in that, described method also comprises:

When the Multicast Broadcast Single Frequency Network MBSFN of each sub-district sub-frame configuration Physical Shared Channel PDSCH subframe, multipoint cooperative CoMP joint transmission is carried out in Serving cell and described joint transmission sub-district in a plurality of described MBSFN subframes.

3. method according to claim 1 is characterized in that, the described SINR that will make the signal that UE receives reach predetermined threshold value the sub-district select before the into cooperation set, also comprise:

To UE notice RRM RRM set, and receive each sub-district corresponding reference signal received power RSRP in the RRM set that described UE measures;

The RSRP corresponding district that will be higher than predetermined threshold value is defined as the CoMP measuring assembly, and the CoMP measuring assembly of determining is notified to described UE, the sub-district that makes described UE in described CoMP measuring assembly each minizone channel relevancy is lower than predetermined threshold value is elected as and is reported set.

4. method according to claim 1 is characterized in that, with the SINR of signal that UE is received reach predetermined threshold value the sub-district select into cooperation set, comprising:

Disturb the strongest sub-district to select into cooperation set in the set described reporting, obtain the SINR of the signal of described UE reception, if SINR does not reach predetermined threshold value, then re-execute and disturb the strongest sub-district to be selected into the cooperation set in the set described reporting, obtain the SINR of the signal that described UE receives, the SINR of the signal that receives until described UE reaches predetermined threshold value.

5. method according to claim 1 is characterized in that, described cooperation set is the subclass of single frequency network SFN sub-district or SFN sub-district.

6. method according to claim 3 is characterized in that, described CoMP measuring assembly is the subclass of SFN set or SFN set.

7. the method for definite joint transmission sub-district is characterized in that, described method comprises:

According to the channel condition information CSI that reports each sub-district in the set that user equipment (UE) sends, obtain the Signal to Interference plus Noise Ratio SINR of UE received signal, with make described SINR reach predetermined threshold value the sub-district select into cooperation set;

Described cooperation set is reported multipoint cooperative transmission CoMP scheduler, described CoMP scheduler is dispatched each sub-district in the described cooperation set, the successful sub-district of scheduling is defined as the joint transmission sub-district.

8. method according to claim 7 is characterized in that, described method also comprises:

When the Multicast Broadcast Single Frequency Network MBSFN of each sub-district sub-frame configuration Physical Shared Channel PDSCH subframe, the CoMP joint transmission is carried out in the joint transmission sub-district that Serving cell and described CoMP scheduler schedules are determined in a plurality of MBSFN subframes.

9. method according to claim 7 is characterized in that, with the SINR of signal that UE is received reach predetermined threshold value the sub-district select before the into cooperation set, described method also comprises:

To UE notice RRM RRM set, and each sub-district corresponding reference signal received power RSRP in the RRM set of reception UE measurement;

The RSRP corresponding district that will be higher than predetermined threshold value is defined as the CoMP measuring assembly, and the CoMP measuring assembly of determining is notified to described UE, the sub-district that makes described UE in the CoMP measuring assembly each minizone channel relevancy is lower than predetermined threshold value is elected as and is reported set.

10. method according to claim 7 is characterized in that, described cooperation set is the subclass of SFN sub-district or SFN sub-district.

11. method according to claim 8 is characterized in that, described CoMP measuring assembly is the subclass of SFN set or SFN set.

12. the device of definite joint transmission sub-district is characterized in that, described device comprises: select module and negotiation module;

Described selection module is used for the channel condition information CSI that reports each sub-district of set that sends according to user equipment (UE), obtains the Signal to Interference plus Noise Ratio SINR of UE received signal, with make described SINR reach predetermined threshold value the sub-district select into cooperation set;

Described negotiation module is used for holding consultation with each sub-district of described cooperation set, is defined as the joint transmission sub-district with consulting successful sub-district.

13. device according to claim 12, it is characterized in that, when the Multicast Broadcast Single Frequency Network MBSFN of each sub-district sub-frame configuration Physical Shared Channel PDSCH subframe, multipoint cooperative CoMP joint transmission is carried out in the sub-district of described device service and described joint transmission sub-district in a plurality of MBSFN subframes.

14. device according to claim 12 is characterized in that, described device also comprises: receiver module and determination module;

Described receiver module is used for the set to described UE notice RRM RRM, and receives each sub-district corresponding reference signal received power RSRP in the described RRM set that described UE measures;

Described determination module, the RSRP corresponding district that is used for being higher than predetermined threshold value is defined as the CoMP measuring assembly, and the CoMP measuring assembly of determining is notified to described UE, the sub-district that makes described UE in described CoMP measuring assembly each minizone channel relevancy is lower than predetermined threshold value is elected as and is reported set.

15. the device of definite joint transmission sub-district is characterized in that, described device comprises: processing module and multipoint cooperative transmission CoMP scheduler;

Described processing module is used for the channel condition information CSI that reports each sub-district of set that sends according to user equipment (UE), obtains the Signal to Interference plus Noise Ratio SINR of UE received signal, with make described SINR reach predetermined threshold value the sub-district select into cooperation set; And described cooperation set reported described CoMP scheduler;

Described CoMP scheduler is used for each sub-district of described cooperation set is dispatched, and the successful sub-district of scheduling is defined as the joint transmission sub-district.

16. device according to claim 15, it is characterized in that, when the Multicast Broadcast Single Frequency Network MBSFN of each sub-district sub-frame configuration Physical Shared Channel PDSCH subframe, the CoMP joint transmission is carried out in the joint transmission sub-district that the sub-district of described processing module service and described CoMP scheduler schedules are determined in a plurality of MBSFN subframes.

17. device according to claim 15 is characterized in that, described device also comprises: UE;

Accordingly, described processing module also is used for the set to described UE notice RRM RRM;

Described UE measures each sub-district corresponding reference signal received power RSRP in the described RRM set, and sends to described processing module after the notice of the described RRM set that receives described processing module transmission;

Described processing module also is used for behind the RSRP of each the sub-district correspondence of RRM set that receives described UE transmission, and the RSRP corresponding district that will be higher than predetermined threshold value is defined as the CoMP measuring assembly, and the described CoMP measuring assembly that will determine is notified to described UE;

Described UE is after the notice of receiving the CoMP measuring assembly that described processing module is determined, measure the CSI of each sub-district in the described CoMP measuring assembly, select to report set according to the CSI of each sub-district in the described CoMP measuring assembly, and report with described that the CSI of each sub-district sends to described processing module in the set.

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