CN104813599B - Ue and ue filtering method - Google Patents

Abstract

The invention provides the filtering method in UE, including: estimate the channel for subframe and interference respectively according to from the cell special reference of cell receiver；Determining that described subframe is flexible sub-frame, described flexible sub-frame is arranged to the transmission of the different directions of Serving cell and neighbor cell；And use first filter function with at least one parameter different from the parameter of conventional subframe, and the estimation channel for flexible sub-frame is filtered, described conventional subframe is arranged to the transmission of the equidirectional of Serving cell and neighbor cell.Present invention also offers the UE made in aforementioned manners and include the computer readable recording medium storing program for performing of computer instruction for performing said method.

Description

UE and UE filtering method

Technical field

It relates to the interference mitigation in time division duplex (TDD) communication system, and it is specifically related to subscriber equipment (UE) filtering method and in UE.

Background technology

3GPP Long Term Evolution (LTE) is quickly becoming the 4G mobile broadband technology that the world is most dominant.In order to further The performance of ground extension LTE wireless access technology and ability, 3GPP is the most constantly devoted to the further evolution of LTE, to meet For higher data speed and the requirement of network capacity.

LTE can run in FDD (FDD) or TDD (time division duplex) pattern, and tdd mode need not one Dispose flexibly providing in the case of frequency spectrum resource.At present, LTE TDD by provide seven different be semi-statically configured upper The configuration of line link-downlink (UL-DL) allows the distribution of asymmetric uplink-downlink.Semi-static distribution can To mate or demand service situation can not be mated.At 3GPP (3GPP TR 36.828v11.0.0, Evolved Universal Terrestrial Radio Access(E-UTRA)；Further enhancements to LTE Time Division Duplex(TDD)for Downlink-Uplink(DL-UL)interference management and traffic Adaptation (Release 11), 2012-06) in have studied following mechanism, wherein can be (the most instant according to the actual requirements Service conditions) subframe is flexibly allocated to up-link (UL) or downlink (DL) transmission, hereinafter referred to as dynamically TDD. Chinese industrial and informationization portion (MIIT) also show great interest to this, and think that it is to improve focus and indoor scene In one of the key feature of performance.

In the case of dynamic TDD occurs, when the community as a neighbor cell is dispatched in flexible sub-frame for UE During UL transmission, (here, " flexible sub-frame " represents the subframe of the link transmission that may be used in neighbor cell, in described neighbor cell Link transmission direction different from the link transmission direction in Serving cell, and, owing to flexible sub-frame is based on be actually needed can To be flexibly allocated to UL or DL transmission, thus can exist and the conflict of the corresponding subframe for Serving cell, i.e. UL to DL does Disturb), if owing to UE is to the interference of UE (this has very big difference with the interference in the conventional DL subframe with anchor-frame configuration) Dispatch UE in same subframe, then the DL performance of the UE in the Serving cell close with the UE in neighbor cell will seriously drop Low.Accordingly, there exist such problem: have the level of interference of different UL to DL in the case of there is dynamic TDD, this can be tight Heavily reduce DL performance.

In UE side, physical channel and interference, wherein this cell-specific ginseng can be estimated according to cell special reference Examine signal and can use proprietary algorithm (interpolation as in frequency based on classical Minimum Mean Square Error (MMSE) criterion and time domain) Reflect the interference from neighbor cell；And for tradition UE in all DL subframes to estimated physical channel and interference It is filtered, to assist the demodulation of all common signal channels, such as PDCCH and PHICH, and there is transmission mode 1 to 6 PDSCH.Fig. 1 shows processing procedure, wherein for current (that is, instant) subframe, estimates thing according to cell special reference Reason channel and interference.For obtaining more accurate Interference Estimation in the case of there is stability, always can be at Span Continuous DL Introducing wave filter in the time domain of frame, so that estimated value smooths, it can be represented by following formula:

Wherein, H (n) andRepresent estimated instant physical channel and the n-th DL subframe of the n-th DL subframe respectively Filtered estimation channel；I (n) andRepresent estimated instant jamming power and n-th son of the n-th subframe respectively The filtered estimation jamming power of frame；N represents the sequence number of DL subframe；α_HAnd α_IIt is the something lost for physical channel and interference respectively Forgetting the factor, it is reported as precisely as possible to ensure filtered value that it is generally selected little numeral (such as 0.05).α_HAnd α_IValue can consider Systematic function and the change in depending on the channel of UE speed design.

For physical channel, the filtering estimating physical channel in subframe can preferably improve the precision of channel analyser To assist channel to estimate so that the filtering in subframe is always estimated for channel.It is expected for almost identical physical channel special Property removes noisy estimation by filtering.

But, it not compulsory for the filtering estimating interference in subframe, and be necessary the most in some cases. Such as, if disturbing the DL conventional subframe from neighbor cell, (described DL conventional subframe includes: 1) being configured in all communities For using the subframe of identical UL-DL sub-frame configuration in the case of high system load, and 2) at Serving cell and adjacent little District has the subframe of equidirectional (that is, DL)), then in subframe in the case of filtering, can be according to cell-specific with reference to letter Number, the interference statistics amount with same alike result is preferably estimated and is filtered according to formula (2).

But, utilizing dynamic TDD, the UL-DL sub-frame configuration in neighbor cell can be with the UL-DL subframe in Serving cell Differently configured.I.e. there is UL transmission that the subframe of duplicate numbers can be respectively configured in neighbor cell and DL transmits, its Therefore flexible sub-frame it is referred to as.When neighbor cell is for its resident UE schedule UL transmissions in flexible sub-frame, due to UE pair The interference of UE, in Serving cell, the DL performance of the UE of UE will seriously reduce in the neighbor cell, this with in conventional DL subframe In there is a great difference.For the UE in Serving cell, the characteristic that UE is disturbed by the UE of experience in flexible sub-frame and conventional DL The characteristic that DL (i.e. base station to UE) is disturbed by the DL in subframe is very different.Therefore, cannot use in formula (1) and (2) identical Filter function, according to cell special reference, the interference on conventional subframe and flexible sub-frame is filtered.From flexibly The strong jamming of subframe can interrupt the correctness of filter value, the such as interference value after all DL subframe extended offset, and this can be serious Ground reduces DL performance.I.e. when the wave filter in subframe is deployed in the UE that is injured, owing to filtering ring is broken by strong UE to UE interference Bad, the DL performance of all subframes can seriously reduce.

Fig. 2 shows UL-DL sub-frame configuration 2 and the sub-frame configuration being respectively directed to community 30-1 and community 30-2 as example 1, wherein config. number is with reference to 3GPP specification (3GPP TS 36.211v10.3.0, Evolved Universal Terrestrial Radio Access(E-UTRA)；Physical Channels and Modulation (Release 10), 2011-09).As Shown in Fig. 3, when UE32-1 and UE32-2 is close to the cell boarder between community 30-1 and community 30-2, community 30-2 service Subframe #3 of UE32-2 and #8 in UL transmission can severe jamming serviced by community 30-1, the UE32-1 that is in cell boarder Subframe #3 and the DL subframe of #8.In order to identify impact, establish and there are two picocells and be respectively arranged with one in arbitrary community The small-scale scene test of individual UE.Fig. 4 shows the test of the UE handling capacity of the UE32-1 in the most each DL subframe As a result, illustrated therein is and utilize subframe #3 in existing interference filter scheme, more than community 30-1 and #8 to be downgraded, Er Qiesuo Having conventional DL subframe to be also downgraded, this is consistent with theory analysis above.Therefore, it is necessary to improve being used in UE to estimate channel With the filtration module estimating interference (if necessary).

Summary of the invention

Therefore, the main purpose of the disclosure is to estimate to provide effective filters solutions for interference and channel, with dynamic in appearance The impact that DL is disturbed by the strong UL alleviating in flexible sub-frame by improving DL filtering in the case of state TDD.

One side according to the disclosure, it is provided that a kind of user equipment (UE).Described UE includes: estimation unit, is configured to use According to cell special reference, estimate the channel for subframe and interference respectively；Determine unit, be arranged to determine institute Stating subframe is flexible sub-frame, and described flexible sub-frame is arranged to for Serving cell and the biography of the different directions of neighbor cell Defeated；And filter unit, it is configured to the first filter function, the estimation channel of described flexible sub-frame is filtered, Described first filter function has at least one channel parameter different from the channel parameter for conventional subframe, described conventional son Frame is arranged to the transmission of the equidirectional of Serving cell and neighbor cell.

Preferably, filter unit is additionally configured to use the second filter function, and the estimation to described flexible sub-frame is disturbed Being filtered, described second filter function has at least one interference parameter different from the interference parameter for conventional subframe.

Preferably, at least one channel parameter includes forgetting factor α_H, and the first filter function meets following formula:

$\stackrel{\‾}{H}\left(n\right)=(1-{\mathrm{\α}}_H)\·\stackrel{\‾}{H}(n-1)+{\mathrm{\α}}_H\·H\left(n\right)$

Wherein, H (n) andRepresent the n-th DL subframe respectively estimates that channel and the n-th the filtered of DL subframe are estimated Meter channel, n represents the sequence number of subframe, and α_HIt is different for conventional subframe and flexible sub-frame.

Preferably, at least one interference parameter described includes forgetting factor α_I, and filter function meets following formula:

$\stackrel{\‾}{I}\left(n\right)=(1-{\mathrm{\α}}_I)\·\stackrel{\‾}{I}(n-1)+{\mathrm{\α}}_I\·I\left(n\right)$

Wherein, I (n) andRepresent that the filtered estimation estimating interference and the n-th subframe of the n-th subframe is done respectively Disturbing, n represents the sequence number of subframe, and α_IIt is different for conventional subframe and flexible sub-frame.

Preferably, described first filter function by having the single filter of different parameters for flexible sub-frame and conventional subframe Ripple device realizes, or comes real by each having two wave filter for flexible sub-frame and the different parameters of conventional subframe Existing.

Preferably, described second filter function by having the single filter of different parameters for flexible sub-frame and conventional subframe Ripple device realizes, or comes real by each having two wave filter for flexible sub-frame and the different parameters of conventional subframe Existing.

Preferably, if based on the TDD configuration signal received from both Serving cell and neighbor cell, UE detects that frame is joined Any difference in putting, then be defined as flexible sub-frame by described subframe.

Preferably, if the estimation for described subframe is disturbed and the difference of the filtered estimation interference for previous subframe Higher than predetermined threshold, then described subframe is defined as flexible sub-frame.

In another aspect of the disclosure, it is provided that the filtering method in a kind of user equipment (UE).The method includes: root According to cell special reference, estimate the channel for subframe and interference respectively；Determine that described subframe is flexible sub-frame, described spirit Subframe of living is arranged to the transmission of the different directions of Serving cell and neighbor cell；And use the first filter function, to institute The estimation channel stating flexible sub-frame is filtered, and described first filter function has at least one and the channel for conventional subframe The channel parameter that parameter is different, described conventional subframe is arranged to the transmission of the equidirectional of Serving cell and neighbor cell.

Preferably, the method also includes: use the second filter function, and the estimation interference to described flexible sub-frame is filtered Ripple, described second filter function has at least one interference parameter different from the interference parameter for conventional subframe.

Preferably, at least one channel parameter described includes forgetting factor α_H, and the first filter function meets following formula:

$\stackrel{\‾}{H}\left(n\right)=(1-{\mathrm{\α}}_H)\·\stackrel{\‾}{H}(n-1)+{\mathrm{\α}}_H\·H\left(n\right)$

Wherein, H (n) andRepresent the n-th DL subframe respectively estimates that channel and the n-th the filtered of DL subframe are estimated Meter channel, n represents the sequence number of subframe, and α_HIt is different for conventional subframe and flexible sub-frame.

Preferably, at least one interference parameter described includes forgetting factor α_I, and filter function meets following formula:

$\stackrel{\‾}{I}\left(n\right)=(1-{\mathrm{\α}}_I)\·\stackrel{\‾}{I}(n-1)+{\mathrm{\α}}_I\·I\left(n\right)$

Wherein, I (n) andRepresent that the filtered estimation estimating interference and the n-th subframe of the n-th subframe is done respectively Disturbing, n represents the sequence number of subframe, and α_IIt is different for conventional subframe and flexible sub-frame.

Preferably, described first filter function by having the single filter of different parameters for flexible sub-frame and conventional subframe Ripple device realizes, or comes real by each having two wave filter for flexible sub-frame and the different parameters of conventional subframe Existing.

Preferably, the second filter function by having the single filter of different parameters for flexible sub-frame and conventional subframe Realize, or realize by each having two wave filter for flexible sub-frame and the different parameters of conventional subframe.

Preferably, if based on the TDD configuration signal received from both Serving cell and neighbor cell, UE detects that frame is joined Any difference in putting, then be defined as flexible sub-frame by described subframe.

Preferably, if the estimation interference for subframe is high with the difference of the interference of the filtered estimation for previous subframe In predetermined threshold, then described subframe is defined as flexible sub-frame.

In another aspect of the disclosure, it is provided that a kind of storage thereon has the computer of computer executable instructions Computer-readable recording medium, this instruction is for the process being filtered interference in user equipment (UE).Described process includes: special according to community By reference signal, estimate the channel for subframe and interference respectively；Determine that described subframe is flexible sub-frame, described flexible sub-frame quilt It is configured to the transmission of the different directions of Serving cell and neighbor cell；And use the first filter function, to described flexible son The estimation channel of frame is filtered, and it is different from the channel parameter for conventional subframe that described first filter function has at least one Channel parameter, described conventional subframe is arranged to the transmission of the equidirectional of Serving cell and neighbor cell.

Preferably, this process also includes: use the second filter function, and the estimation interference to described flexible sub-frame is filtered Ripple, described second filter function has at least one interference parameter different from the interference parameter for conventional subframe.

Preferably, at least one channel parameter includes forgetting factor α_H, and the first filter function meets following formula:

$\stackrel{\‾}{H}\left(n\right)=(1-{\mathrm{\α}}_H)\·\stackrel{\‾}{H}(n-1)+{\mathrm{\α}}_H\·H\left(n\right)$

Wherein, H (n) andRepresent the n-th DL subframe respectively estimates that channel and the n-th the filtered of DL subframe are estimated Meter channel, n represents the sequence number of subframe, and α_HIt is different for conventional subframe and flexible sub-frame.

Preferably, at least one interference parameter described includes forgetting factor α_I, and filter function meets following formula:

$\stackrel{\‾}{I}\left(n\right)=(1-{\mathrm{\α}}_I)\·\stackrel{\‾}{I}(n-1)+{\mathrm{\α}}_I\·I\left(n\right)$

Wherein, I (n) andRepresent that the filtered estimation estimating interference and the n-th subframe of the n-th subframe is done respectively Disturbing, n represents the sequence number of subframe, and α_IIt is different for conventional subframe and flexible sub-frame.

Preferably, described first filter function by having the single filter of different parameters for flexible sub-frame and conventional subframe Ripple device realizes, or comes real by each having two wave filter for flexible sub-frame and the different parameters of conventional subframe Existing.

Preferably, described second filter function by having the single filter of different parameters for flexible sub-frame and conventional subframe Ripple device realizes, or comes real by each having two wave filter for flexible sub-frame and the different parameters of conventional subframe Existing.

Preferably, if based on the TDD configuration signal received from both Serving cell and neighbor cell, UE detects that frame is joined Any difference in putting, then be defined as flexible sub-frame by described subframe.

Preferably, if the estimation for described subframe is disturbed and the difference of the filtered estimation interference for previous subframe Higher than predetermined threshold, then described subframe is defined as flexible sub-frame.

The disclosure can well improve the dynamic TDD system using different UL/DL sub-frame configuration in neighbor cell in ground DL performance.Specifically, the disclosure introduces multiple wave filter for channel or the interference of different types of DL subframe, and is used for Enabling the condition trigger of multiple wave filter, the plurality of wave filter is according to the interference of experience or about the subframe carrying out automatic network The extra signaling of configuration is distinguished and is grouped.

Accompanying drawing explanation

According to the description of preferred embodiment, in conjunction with accompanying drawing, the purpose of the disclosure, beneficial effect and feature will be brighter Aobvious, wherein:

Fig. 1 is illustratively shown the schematic block diagram of the channel in UE side and Interference Estimation；

Fig. 2 shows the example of the different TDD UL-DL sub-frame configuration used by two neighbor cells；

Fig. 3 is illustratively shown the system that two of which neighbor cell has the different TDD UL-DL sub-frame configuration of Fig. 2 Schematic diagram；

Fig. 4 shows the DL handling capacity result of the test of each subframe of the dynamic TDD sub-frame configuration with Fig. 2；

Fig. 5 is illustratively shown the block diagram of the UE according to disclosure exemplary embodiment；And

Fig. 6 is illustratively shown the filtering method flow chart in UE side of the exemplary embodiment according to the disclosure.

It should be noted that, the various piece of accompanying drawing is not necessarily drawn to scale, and solely for the purpose of illustration, therefore It is not construed as any restriction to disclosure scope and constraint.

Detailed description of the invention

In order to make the purpose of the disclosure, technical scheme and beneficial effect become apparent from, with reference to the accompanying drawings with exemplary enforcement The disclosure is further described in detail by example.In the de-scription, have been omitted for clarity the most unnecessary Details and function.Although the disclosure illustrates with LTE TDD system for example, when what its radio communication in office is (such as TD- When transmitting while there is different (DL or UL) direction in neighbor cell SCDMA), this basic thought can be used for other TDD system.

Hereinafter, with reference to Fig. 5, the UE structure of the exemplary embodiment according to the disclosure will be described in detail.Fig. 5 It is illustratively shown the block diagram of UE500.

As it is shown in figure 5, UE500 can include estimation unit 501, it is arranged to according to from the community of cell receiver DRS (Dedicated Reference Signal) (3GPP TS 36.211v10.3.0, Evolved Universal Terrestrial Radio Access (E-UTRA)；Physical Channels and Modulation (Release 10), 2011-09), estimate respectively for son The physical channel of frame and interference；Determine unit 503, be arranged to determine that subframe is flexible sub-frame or conventional subframe；And Filter unit 505, the estimation interference being arranged to the estimation channel to present sub-frame and (alternatively) present sub-frame is filtered Ripple.

Because the flexible configuration of TDD network, it is understood that there may be the DL subframe of two kinds of UE500, i.e. conventional subframe and flexible sub-frame, They can have different level of interference and interference source, i.e. DL to DL and UL to DL.As previously mentioned, conventional subframe instruction May be used for the subframe of transmission in the Serving cell of its own, the transmission direction in this Serving cell with in neighbor cell Transmission direction identical, and community instruction flexibly may be used for the subframe of transmission in the Serving cell of its own, at this Transmission direction in Serving cell is different from the transmission direction in neighbor cell.

Determine that unit 503 can be arranged to determine that this subframe is flexible sub-frame or conventional subframe.Determine unit 503 Determination result may be used for the follow-up filtering by filter unit 505.Such as, determine that unit 503 can be with origin automatic network Signaling or blind Detecting trigger.

In the case of detection signaling, TDD UL/DL sub-frame configuration can be via system information broadcast (SIB) signalling (3GPP TS 36.331v9.3.0, Evolved Universal Terrestrial Radio Access (E-UTRA)； Radio Resource Control(RRC)；Protocol specification (Release 9), 2010-06) broadcast. Determine that unit 503 can detect the SIB information of the Serving cell for its own, and can also detect for neighbor cell SIB information.Different configurations once detected, determine that unit 503 may determine that present sub-frame is flexible sub-frame；Otherwise, it determines Unit 503 may determine that present sub-frame is conventional subframe.Determine then, it is determined that unit 503 can send this to filter unit 505 Result.

In the case of blind Detecting, if subframe exists the strong jamming of the UL transmission from the UE in neighbor cell, spirit The interference of subframe of living can be more much higher than the interference of conventional subframe, it is possible to for determining that unit 503 predefines threshold value I_thrd, with Based on interference difference grade and predefined threshold value between relatively determine that present sub-frame is flexible sub-frame or conventional subframe.Interference Difference table of grading is shown as the difference of the interference of the present sub-frame estimated by estimation unit 501 and previous subframe.Especially, if for working as The interference difference grade of the estimation of front subframe is higher than predefining threshold value (regardless of whether have what any UL from neighbor cell transmitted High interference), it is determined that unit 503 may determine that present sub-frame is flexible sub-frame and the severe jamming by adjacent UL subframe. Otherwise, it determines unit 503 may determine that present sub-frame is conventional subframe.In a preferred embodiment, described determine can based on Lower criterion:

IfThen

Determine that present sub-frame is flexible sub-frame；

Otherwise

Determine that present sub-frame is conventional subframe；

Terminate.

Wherein, I (n) represent for the n-th subframe currently estimate interference,Represent for (n-1) individual subframe Filtering interference, n represents the sequence number of DL subframe, and I_thrdRepresent predefined threshold value.

Then, it is determined that unit 503 can send this to filter unit 505 determines result.

Described above, it is understood that there may be for two kinds of subframe-flexible sub-frame and the conventional subframe of UE, they can have Different level of interference.Therefore, only there is the same filter function estimated for channel as shown in formula (1) and/or only have The filter unit 505 of the same filter function for Interference Estimation illustrated just like formula (2) is infeasible.

Therefore, according to the exemplary embodiment of the disclosure, filter unit 505 can be configured to have at least one The filter function of the parameter that individual and for conventional subframe parameter is differentThe estimation channel of flexible sub-frame is filtered. Preferably, at least one parameter described includes forgetting factor α_H, and this filter function can meet following formula:

$\stackrel{\‾}{H}\left(n\right)=(1-{\mathrm{\α}}_H)\·\stackrel{\‾}{H}(n-1)+{\mathrm{\α}}_H\·H\left(n\right)---\left(3\right)$

Wherein, H (n) andRepresenting the estimation channel of the n-th DL subframe and filtered estimation channel respectively, n represents The sequence number of subframe, and α_HIt is different for conventional subframe and flexible sub-frame.

The fact that of owing to being conventional subframe or flexible sub-frame independent of this subframe, channel can have identical geometry Figure, can be used for single filter realizing for flexible sub-frame and the filter function of conventional subframeBut, due to H N the estimated value of () more " noisy ", therefore should correspondingly adjust wave filter in flexible sub-frame.Such as, by by higher Weight (is expressed as α_H-NS) give the channel in the most noisy subframe (i.e. conventional subframe), and relatively low weight (is represented For α_H-FS) give the channel in noisy subframe (i.e. flexible sub-frame), it is arranged differently than forgetting factor α_HSo that in certain journey The impact estimated from noisy subframe can be reduced on degree.

It is alternatively possible to use two wave filter, one for realizing the filter function for flexible sub-frame (referred to as), another is for realizing the filter function for conventional subframe (referred to as)。

In the present embodiment, if by determining that unit 503 determines that the n-th subframe is conventional subframe, then filter unit 505 can With according to following formula, use filter functionThe estimation channel of conventional subframe n is filtered:

${\stackrel{\‾}{H}}_{NS}\left(n\right)=(1-{\mathrm{\α}}_{H-NS})\·{\stackrel{\‾}{H}}_{NS}(n-1)+{\mathrm{\α}}_{H-NS}\·H_{NS}\left(n\right),---(3-1)$

If by determining that unit 503 determines that the n-th subframe is flexible sub-frame, then filter unit 505 can make according to following formula Use filter functionThe estimation channel of flexible sub-frame k is filtered:

${\stackrel{\‾}{H}}_{FS}\left(k\right)=(1-{\mathrm{\α}}_{H-FS})\·{\stackrel{\‾}{H}}_{FS}(k-1)+{\mathrm{\α}}_{H-FS}\·H_{FS}\left(k\right),---(3-2)$

According to other exemplary embodiment, Serving cell with neighbor cell are configured with high system load with identical In the case of UL/DL sub-frame configuration, for being injured, UE produces interference from adjacent DL subframe, and described interference shows identical Characteristic.Therefore, the filtering estimating interference for subframe is necessary, to obtain more accurate estimation of disturbance power.

In the present embodiment, filter unit 505 can be configured to filter functionFlexible sub-frame is estimated Meter channel is filtered, described filter functionThere is at least one parameter different from the parameter for conventional subframe, and And described filter unit is additionally configured to use filter functionEstimation interference to flexible sub-frame is filtered, described filter Wave functionThere is at least one parameter different from the parameter for conventional subframe.

Preferably, filter functionAt least one parameter include forgetting factor α_H, and filter functionPermissible Meet following formula:

$\stackrel{\‾}{H}\left(n\right)=(1-{\mathrm{\α}}_H)\·\stackrel{\‾}{H}(n-1)+{\mathrm{\α}}_H\·H\left(n\right)---\left(3\right)$

Wherein, H (n) andRepresent the n-th DL subframe respectively estimates that channel and the n-th the filtered of DL subframe are estimated Meter channel；N represents the sequence number of subframe, and α_HIt is different for conventional subframe and flexible sub-frame.

Further, filter functionAt least one parameter include forgetting factor α_I, and filter functionCan meet Following formula:

$\stackrel{\‾}{I}\left(n\right)=(1-{\mathrm{\α}}_I)\·\stackrel{\‾}{I}(n-1)+{\mathrm{\α}}_I\·I\left(n\right)---\left(4\right)$

Wherein, I (n) andRepresent that the filtered estimation estimating interference and the n-th subframe of the n-th subframe is done respectively Disturbing, n represents the sequence number of subframe, and α_IIt is different for conventional subframe and flexible sub-frame.

With described above similarly, single filter may be used for realizing for the filtering letter of flexible sub-frame and conventional subframe NumberAnd single filter may be used for realizing for flexible sub-frame and the filter function of conventional subframeCan lead to Cross and higher weight (is expressed as α_H-NS) give the channel in the most noisy subframe (i.e. conventional subframe), and by relatively low Weight (is expressed as α_H-FS) give the channel in noisy subframe (i.e. flexible sub-frame), it is arranged differently than forgetting factor α_H.And can With by higher weight (is expressed as α_I-NS) give the channel in conventional subframe, and low weight (is expressed as α_I-FS) Give the channel in flexible sub-frame, be arranged differently than forgetting factor α_ISo that can reduce from conventional subframe or sub flexibly The impact of the Interference Estimation of frame.

It is alternatively possible to use two wave filter to estimate for channel, one for realizing the filtering for flexible sub-frame Function is (referred to as), another is for realizing the filter function for conventional subframe (referred to as).And can make With two wave filter for Interference Estimation, one for realizing the filter function for flexible sub-frame (referred to as), another For realizing the filter function for conventional subframe (referred to as)。

In the present embodiment, if by determining that unit 503 determines that the n-th subframe is conventional subframe, then filter unit 505 points Do not use filter function according to following formulaIt is used for the estimation channel of conventional subframe n is filtered, and uses filtering letter NumberFor the estimation of conventional subframe n interference is filtered:

${\stackrel{\‾}{H}}_{NS}\left(n\right)=(1-{\mathrm{\α}}_{H-NS})\·{\stackrel{\‾}{H}}_{NS}(n-1)+{\mathrm{\α}}_{H-NS}\·H_{NS}\left(n\right),---(3-1)$

${\stackrel{\‾}{I}}_{NS}\left(n\right)=(1-{\mathrm{\α}}_{I-NS})\·{\stackrel{\‾}{I}}_{NS}(n-1)+{\mathrm{\α}}_{I-NS}\·I_{NS}\left(n\right),---(4-1)$

If by determining that unit 503 determines that kth subframe is flexible sub-frame, then filter unit 505 can respectively according under Formula uses filter functionFor the estimation channel of flexible sub-frame k is filtered, and use filter functionWith It is filtered in the estimation of flexible sub-frame k is disturbed:

${\stackrel{\‾}{H}}_{FS}\left(k\right)=(1-{\mathrm{\α}}_{H-FS})\·{\stackrel{\‾}{H}}_{FS}(k-1)+{\mathrm{\α}}_{H-FS}\·H_{FS}\left(k\right),---(3-2)$

${\stackrel{\‾}{I}}_{FS}\left(k\right)=(1-{\mathrm{\α}}_{I-FS})\·{\stackrel{\‾}{I}}_{FS}(k-1)+{\mathrm{\α}}_{I-FS}\·I_{FS}\left(k\right),---(4-2)$

Then, UE500 can use filter function to distinguish the DL in aid demodulation flexible DL subframe and conventional DL subframe Data.According to the disclosure, different filter functions can apply to the follow-up data demodulation of dissimilar DL subframe.

Hereinafter, with reference to Fig. 6, the filtering method in UE500 is described.Fig. 6 is illustratively shown according to the disclosure The flow chart of the filtering method 600 being positioned at UE500 side of exemplary embodiment.

In step S610, the estimation unit 501 of UE500 can according to cell special reference, estimate respectively for The physical channel of subframe and interference.Described cell special reference can be from reflecting the service from neighbor cell interference Receive at community.

In step S620, UE500 cell 503 really may determine that present sub-frame is flexible sub-frame or conventional son Frame.Determine that the determination result of unit 503 can be filtered by filter unit 505 follow-up.Such as, filter unit 503 is permissible As described above triggered by signaling or blind Detecting.

It is merely to illustrate, there is no any restriction, hereinafter will describe in view of for estimating channel and the filtering of interference Situation.To those skilled in the art, based on discussed below, it is easy to envision for estimating the filtering of interference not It it is the embodiment under necessary information.

If in step S620, by determining that unit 503 determines that currently (such as n-th) subframe is conventional subframe, then flow Journey proceeds to step S630, and filter unit 505 can use filter function according to following formulaFor flexible sub-frame n is estimated Meter channel is filtered, and uses filter functionFor the estimation of conventional subframe n interference is filtered:

${\stackrel{\‾}{H}}_{NS}\left(n\right)=(1-{\mathrm{\α}}_{H-NS})\·{\stackrel{\‾}{H}}_{NS}(n-1)+{\mathrm{\α}}_{H-NS}\·H_{NS}\left(n\right),---(3-1)$

${\stackrel{\‾}{I}}_{NS}\left(n\right)=(1-{\mathrm{\α}}_{I-NS})\·{\stackrel{\‾}{I}}_{NS}(n-1)+{\mathrm{\α}}_{I-NS}\·I_{NS}\left(n\right),---(4-1)$

If in step S620, by determining that unit 503 determines that currently (such as kth) subframe is flexible sub-frame, then flow Journey proceeds to step S640, and wherein filter unit 505 can use filter function according to following formulaFor to flexible sub-frame k Estimation channel be filtered, and use filter functionFor the estimation of flexible sub-frame k interference is filtered:

${\stackrel{\‾}{H}}_{FS}\left(k\right)=(1-{\mathrm{\α}}_{H-FS})\·{\stackrel{\‾}{H}}_{FS}(k-1)+{\mathrm{\α}}_{H-FS}\·H_{FS}\left(k\right),---(3-2)$

${\stackrel{\‾}{I}}_{FS}\left(k\right)=(1-{\mathrm{\α}}_{I-FS})\·{\stackrel{\‾}{I}}_{FS}(k-1)+{\mathrm{\α}}_{I-FS}\·I_{FS}\left(k\right),---(4-2)$

Wherein α_H-NSAnd α_H-FSIt is the forgetting factor estimated for the channel on conventional subframe and flexible sub-frame respectively；And α_I-NSAnd α_I-FSIt is the forgetting factor for the Interference Estimation on conventional subframe and flexible sub-frame respectively.

Then, the DL number during UE500 can use filter function aid demodulation flexible DL subframe respectively and conventional DL subframe According to.According to the disclosure, different filter functions can apply to the follow-up data demodulation of different types of DL subframe.

It will be appreciated that embodiment of the disclosure according to the description of claim and description, can with hardware, software or The form of combination of hardware realizes.

Any such software can be stored in a computer-readable storage medium.Computer-readable recording medium storage one Individual or multiple programs (software module), the one or more program includes instruction, and described instruction is by electronic equipment One or more processors cause electronic equipment to perform disclosed method when performing.

Any such software can store with the form of volatile memory or nonvolatile memory, and such as ROM etc. deposit Storage device, in spite of being erasable or rewritable, or with such as RAM, storage chip, device or integrated circuit etc. The form storage of memorizer, or be stored on the light such as such as CD, DVD, disk or tape or magnetic computer-readable recording medium.It should be appreciated that Storage device or storage medium are adapted for the detailed description of the invention of the machine readable nonvolatile storage of storage program or multiple program, Described program or multiple program include the instruction implementing disclosure embodiment when executed.

Therefore, embodiment provides and comprises for realizing the device and the side that state such as any claim of this specification Method, and store the machine readable memory of such program.Additionally, such program (such as can exist via any medium In wired or wireless connection the signal of communication of carrying and compatibly include its embodiment) fax passs.

The disclosure can well improve the dynamic TDD system in neighbor cell with different UL/DL sub-frame configuration DL performance.Specifically, present disclosure proposes the multiple interference filters for different types of DL subframe, described different types of DL subframe is distinguished according to the feature of the interference of experience and is grouped, and is used for enabling multiple channel model and interference filter Condition trigger.

It is preferred embodiment of the present disclosure above, and above-described embodiment does not limit the disclosure.Therefore, then without departing substantially from On the premise of the spirit and scope of the disclosure, pin any amendment of this disclosure, to replace and improve be all possible.

Claims (16)

1. a user equipment (UE) (500), including:

Estimation unit (501), is arranged to according to cell special reference, estimates the channel for subframe respectively and does Disturb；

Determine unit (503), be arranged to determine that described subframe is flexible sub-frame, described flexible sub-frame be arranged to for The transmission of the different directions of Serving cell and neighbor cell；And

Filter unit (505), is configured to the first filter function, filters the estimation channel of described flexible sub-frame Ripple, described first filter function has at least one channel parameter different from the channel parameter for conventional subframe, described often Rule subframe is arranged to the transmission of the equidirectional of Serving cell and neighbor cell.

UE the most according to claim 1 (500), wherein, filter unit (505) is additionally configured to use the second filtering letter Number, the estimation interference to described flexible sub-frame is filtered, and it is sub with for routine that described second filter function has at least one The interference parameter that the interference parameter of frame is different.

UE the most according to claim 1 (500), wherein, at least one channel parameter includes forgetting factor α_H, and described First filter function meets following formula:

$\stackrel{\‾}{H}\left(n\right)=(1-{\mathrm{\α}}_H)\·\stackrel{\‾}{H}(n-1)+{\mathrm{\α}}_H\·H\left(n\right)$

Wherein, H (n) andRepresent the filtered estimation letter estimating channel and the n-th DL subframe of the n-th DL subframe respectively Road, n represents the sequence number of subframe, and α_HIt is different for conventional subframe and flexible sub-frame.

UE the most according to claim 2 (500), wherein, at least one interference parameter includes forgetting factor α_I, and described Second filter function meets following formula:

$\stackrel{\‾}{I}\left(n\right)=(1-{\mathrm{\α}}_I)\·\stackrel{\‾}{I}(n-1)+{\mathrm{\α}}_I\·I\left(n\right)$

Wherein, I (n) andRepresent the filtered estimation interference estimating interference and the n-th subframe of the n-th subframe, n respectively Represent the sequence number of subframe, and α_IIt is different for conventional subframe and flexible sub-frame.

5. according to the UE (500) described in claim 1 or 3, wherein, described first filter function passes through for flexible sub-frame with often Rule subframe has the single filter of different parameters and realizes, or by each having for flexible sub-frame and conventional subframe Two wave filter of different parameters realize.

UE the most according to claim 2 (500), wherein, described second filter function is by for flexible sub-frame and routine Subframe has the single filter of different parameters and realizes, or by each having for flexible sub-frame and conventional subframe not Two wave filter of same parameter realize.

UE the most according to claim 1 and 2 (500), wherein, if UE connects based on from both Serving cell and neighbor cell The TDD configuration signal received detects any difference in frame configuration, then described subframe is defined as flexible sub-frame.

UE the most according to claim 2 (500), wherein, if the estimation for described subframe is disturbed and for previous son Described subframe higher than predetermined threshold, is then defined as flexible sub-frame by the difference of the filtered estimation interference of frame.

9. the filtering method (600) in a user equipment (UE), including:

According to cell special reference, estimate that (S610) is for the channel of subframe and interference respectively；

Determining that (S620) described subframe is flexible sub-frame, described flexible sub-frame is arranged to Serving cell and neighbor cell not Equidirectional transmission；And

Use the first filter function, the estimation channel of described flexible sub-frame is filtered (S630), described first filter function Having at least one channel parameter different from the channel parameter for conventional subframe, described conventional subframe is arranged to service The transmission of the equidirectional of community and neighbor cell.

Method the most according to claim 9 (600), also includes:

Using the second filter function, the estimation interference to described flexible sub-frame is filtered (S630), described second filter function There is at least one interference parameter different from the interference parameter for conventional subframe.

11. methods according to claim 9 (600), wherein, at least one channel parameter includes forgetting factor α_H, and the One filter function meets following formula:

$\stackrel{\‾}{H}\left(n\right)=(1-{\mathrm{\α}}_H)\·\stackrel{\‾}{H}(n-1)+{\mathrm{\α}}_H\·H\left(n\right)$

Wherein, H (n) andRepresent the filtered estimation letter estimating channel and the n-th DL subframe of the n-th DL subframe respectively Road, n represents the sequence number of subframe, and α_HIt is different for conventional subframe and flexible sub-frame.

12. methods according to claim 10 (600), wherein, at least one interference parameter includes forgetting factor α_I, and Described second filter function meets following formula:

$\stackrel{\‾}{I}\left(n\right)=(1-{\mathrm{\α}}_I)\·\stackrel{\‾}{I}(n-1)+{\mathrm{\α}}_I\·I\left(n\right)$

Wherein, I (n) andRepresent the filtered estimation interference estimating interference and the n-th subframe of the n-th subframe, n respectively Represent the sequence number of subframe, and α_IIt is different for conventional subframe and flexible sub-frame.

13. according to the method (600) described in claim 9 or 11, and wherein, described first filter function is by for flexible sub-frame The single filter with conventional subframe with different parameters realizes, or by each having for flexible sub-frame and routine Two wave filter of the different parameters of frame realize.

14. methods according to claim 10 (600), wherein, described second filter function by for flexible sub-frame and Conventional subframe has the single filter of different parameters and realizes, or by each having for flexible sub-frame and conventional subframe Two wave filter of different parameters realize.

15. according to the method (600) described in claim 9 or 10, wherein, if UE is based on from Serving cell and neighbor cell two The TDD configuration signal that person receives detects any difference in frame configuration, then described subframe is defined as flexible sub-frame.

16. methods according to claim 10 (600), wherein, if the estimation for subframe is disturbed and for previous son Described subframe higher than predetermined threshold, is then defined as flexible sub-frame by the difference of the filtered estimation interference of frame.