CN103905146A - Channel state information reporting method and user equipment - Google Patents
Channel state information reporting method and user equipment Download PDFInfo
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- CN103905146A CN103905146A CN201210583466.XA CN201210583466A CN103905146A CN 103905146 A CN103905146 A CN 103905146A CN 201210583466 A CN201210583466 A CN 201210583466A CN 103905146 A CN103905146 A CN 103905146A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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Abstract
The embodiment of the invention provides a channel state information reporting method and user equipment. The method comprises the steps that the UE receives first signaling issued by a base station, wherein the first signaling comprises the moment T for the UE to report CSI; the UE acquires a moment t(n) for reporting the CSI according to the moment T; at the moment t(n), a third channel estimation value at a moment t(n+delta t) is acquired according to a first channel estimation value and a second channel estimation value, and the CSI is acquired according to the third channel estimation value; the CSI is reported to the base station; and the base station configures AMC of the UE according to the CSI. The first channel estimation value is a channel estimation value which is acquired at the moment t(n). The second channel estimation value is a channel estimation value before the UE acquires the first channel estimation value. n is the reporting time. Delta t is a delay time period which is composed of the delay of the UE side and the delay of the base station side when the UE reports the CSI. The method is used for solving the problem that the optimal performance of delay cannot be acquired when the UE reports the CSI.
Description
Technical field
The embodiment of the present invention relates to the communication technology, relates in particular to a kind of method and subscriber equipment of reporting source of channel state information.
Background technology
In present mobile communication, for better to anti-fading to obtain higher spectrum efficiency, often all adopted adaptive modulation and coding scheme.
Adaptive modulation and coding (Adaptive Modulation and Coding, be called for short AMC), compared with power adaptive under constant rate of speed, can better improve throughput of system.Therefore in the international standard of many wireless system for transmitting data, all adopted adaptive modulation and coding technology, for example, as Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, be called for short WCDMA) strengthen high speed downlink packet access (the High Speed Downlink Packet Access of technology, be called for short HSDPA) system, WLAN (wireless local area network) (Wireless Local Area Networks, be called for short WLAN) standard 802.11a, BWA IEEE802.16, and third generation partner program (The3rd Generation Partnership Project, be called for short 3GPP) Long Term Evolution (Long Term Evolution, be called for short LTE) etc. all adopt Adaptive Modulation and Coding technology to improve throughput and the spectrum efficiency of system.
For example, in LTE system, periodically reporting status information of channel (Channel State Information of subscriber equipment (User Equipment is called for short U E), be called for short CSI), all amounts of reporting of UE are all the channel estimation value H based on the current a certain moment.CQI, PMI, RI that the CSI at this place can be obtained by UE form.
Wherein, UE is by calculating Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Ratio, be called for short SINR) obtain channel quality indication (Channel Quality Indicator, be called for short CQI), obtain pre-coding matrix indication (Precoding Matrix Indicator by the precoding vector of calculated gains maximum, be called for short PMI), obtain order indication (Rank Indicator is called for short RI) by calculating the order information of channel.
Conventionally, the report cycle of base station side configuration UE,, from moment t, every period p, UE reports CSI one time.But, in prior art, do not consider calculation delay when UE reports CSI.
For instance, as shown in Figure 1, the CSI that UE reports at moment t, is actually UE at t-Δ t
1the measured value in moment.In LTE Frequency Division Duplexing (FDD) (Frequency Division Duplexing is called for short FDD) system, Δ t
1maximum be 4～5ms, the measured value of 4～5ms is all thought effectively before moment t.The CSI reporting at t moment UE is through propagation delay Δ t
2arrive base station; Through processing and the reporting time delay Δ t of base band
3arrive the scheduler of base station; Through certain dispatch deal time delay Δ t
4the CSI institute's modulation after treatment and the encoding scheme that obtain reporting based on UE, and issue data; Through propagation delay Δ t
5arrive U E.
By upper, based on t
0the measured CSI obtaining of channel information H in moment, is experiencing Δ
tafterwards just by the real UE that used.Consider the time domain of channel, the fluctuation of frequency domain, may there is variation in the channel in these two moment, thereby cause based on t
0the correlation measure of the channel H in moment and t
0the channel in+Δ t moment does not mate, and reflecting in UE side is exactly to handle up fluctuation acutely, cannot reach system optimal value, has reduced the actual gain of AMC.
Thus, UE reports the benchmark moment of CSI and base station actual schedule moment to pass through a time delay, when in the time of channel, change (fluctuation of time domain) is more serious, the actual channel deviation in these two moment is larger, and the CSI reporting based on UE carries out the performance that AMC cannot guarantee that it is optimum.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of method and subscriber equipment of reporting source of channel state information, and the time delay when solving in prior art that UE reports CSI cannot guarantee the problem of the AMC that obtains optimal performance.
First aspect, provides a kind of method of reporting source of channel state information, comprising:
User equipment (UE) receives the first signaling that base station issues, and described the first signaling comprises: the moment T of described UE reporting status information of channel CSI;
Described UE obtains reporting the moment t (n) of described CSI according to described moment T, when moment t (n), (n+ Δ is the 3rd channel estimation value in moment t), and obtains CSI according to described the 3rd channel estimation value to obtain t according to the first channel estimation value and at least one second channel estimated value;
Report the CSI obtaining to described base station; So that described base station configures the adaptive modulation and coding AMC of described UE according to described CSI;
Wherein, the channel estimation value obtaining when described the first channel estimation value is moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n);
Described second channel estimated value is the channel estimation value before described the first channel estimation value of obtaining of described UE;
N is for reporting time point, and Δ t is the time delay time period of the described UE time delay of UE side and time delay composition of base station side while reporting CSI.
In conjunction with first aspect, in the possible implementation of the first, described according to the first channel estimation value and at least one second channel estimated value obtain t (n+ Δ is the 3rd channel estimation value in moment t), comprising:
(t) the 3rd channel estimation value H in moment is (n+ Δ t), for n+ Δ to obtain t according to the first channel estimation value H (n) and second channel estimated value H (n-1)
Wherein, the channel estimation value that the first channel estimation value H (n) obtains while being moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n), and the channel estimation value that described second channel estimated value H (n-1) obtains while being moment t (n-1) or moment t (n-1) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n-1).
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of the second, it is the moment of described UE periodic report CSI that described UE reports the moment T of CSI, or it is the moment that the interim described UE of triggering reports CSI that described UE reports the moment T of CSI.
In conjunction with first aspect and above-mentioned possible implementation, in the third possible implementation, the described CSI obtaining according to described the 3rd channel estimation value that reports to described base station, comprises one or more in following information:
Report the channel quality indicator (CQI) obtaining according to described the 3rd channel estimation value to described base station;
Report the pre-coding matrix indication PMI obtaining according to described the 3rd channel estimation value to described base station;
Report the order indication RI obtaining according to described the 3rd channel estimation value to described base station.
In conjunction with first aspect and above-mentioned possible implementation, in the 4th kind of possible implementation, described the first signaling also comprises: time delay time period Δ t;
Or described time delay time period Δ t is pre-configured in described UE.
Second aspect, provides a kind of subscriber equipment, comprising:
Receiving element, the first signaling issuing for receiving base station, described the first signaling comprises: the moment T of reported by user equipment UE channel condition information CSI;
Acquiring unit, for after described receiving element receives described the first signaling, obtain reporting the moment t (n) of described CSI according to described moment T, when moment t (n), (n+ Δ is the 3rd channel estimation value in moment t), and obtains CSI according to described the 3rd channel estimation value to obtain t according to the first channel estimation value and at least one second channel estimated value;
Transmitting element, for after described acquiring unit obtains described CSI, reports the CSI obtaining to described base station; So that described base station configures the adaptive modulation and coding AMC of described UE according to described CSI;
Wherein, the channel estimation value obtaining when described the first channel estimation value is moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n);
Described second channel estimated value is the channel estimation value before described the first channel estimation value of obtaining of described UE;
N is for reporting time point, and Δ t is the time delay time period of the described UE time delay of UE side and time delay composition of base station side while reporting CSI.
In conjunction with second aspect, in the possible implementation of the first, described acquiring unit, specifically for
Obtain reporting the moment t (n) of described CSI according to described moment T, when moment t (n), according to the first channel estimation value H (n) and second channel estimated value H (n-1) obtain t (n+ Δ t) the 3rd channel estimation value H in moment (n+ Δ t), and according to described the 3rd channel estimation value H (n+ Δ t) obtains CSI;
Wherein, the channel estimation value that the first channel estimation value H (n) obtains while being moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n), and the channel estimation value that described second channel estimated value H (n-1) obtains while being moment t (n-1) or moment t (n-1) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n-1).
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of the second, it is the moment of described UE periodic report CSI that described UE reports the moment T of CSI, or it is the moment that the interim described UE of triggering reports CSI that described UE reports the moment T of CSI.
In conjunction with second aspect and above-mentioned possible implementation, in the third possible implementation, described CSI comprises one or more in following information:
The channel quality indicator (CQI) that described UE obtains according to described the 3rd channel estimation value;
The pre-coding matrix indication PMI that described UE obtains according to described the 3rd channel estimation value;
The order indication RI that described UE obtains according to described the 3rd channel estimation value.
In conjunction with second aspect and above-mentioned possible implementation, in the 4th kind of possible implementation, described receiving element, specifically for,
Receive the first signaling that base station issues, described the first signaling comprises: the moment T of reported by user equipment UE channel condition information CSI, and time delay time period Δ t.
As shown from the above technical solution, the method of the reporting source of channel state information of the embodiment of the present invention and subscriber equipment, receive by U E the first signaling that base station sends, while obtaining reporting the moment t (n) of CSI according to the first signaling, when moment t (n), (n+ Δ is the 3rd channel estimation value in moment t) to obtain t according to the first channel estimation value and at least one second channel estimated value, and then can report to base station the CSI obtaining according to the 3rd channel estimation value, (n+ Δ is the AMC of CSI configuration UE corresponding to moment t) according to t to make base station, can solve the problem that time delay when UE reports CSI in prior art cannot guarantee the AMC that obtains optimal performance.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, to the accompanying drawing of required use in embodiment be briefly described below, apparently: accompanying drawing is the accompanying drawing of some embodiments of the present invention below, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain other accompanying drawing that can realize equally technical solution of the present invention according to these accompanying drawings.
Fig. 1 is that current C SI reports and the graph of a relation of dispatching cycle;
Fig. 2 is that in the present invention, CSI reports and the graph of a relation of dispatching cycle;
The schematic flow sheet of the method for the reporting source of channel state information that Fig. 3 provides for one embodiment of the invention;
The schematic flow sheet of the method for the reporting source of channel state information that Fig. 4 provides for one embodiment of the invention;
The structural representation of the subscriber equipment that Fig. 5 provides for one embodiment of the invention;
The structural representation of the subscriber equipment that Fig. 6 provides for one embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme of the present invention is clearly and completely described.Obviously, each following embodiment is the embodiment of a part of the present invention.Based on each following embodiment of the present invention, those of ordinary skills are even without making creative work, also can pass through the even whole technical characterictic of equivalent transformation part, can solve the technology of the present invention problem and obtain, realize other embodiment of the technology of the present invention effect, and these conversion and come each embodiment obviously do not depart from scope disclosed in this invention.
At present, AMC is a kind of according to the technology of the modulation of channel situation adaptively changing and coded system.The method that channel situation can be fed back by receiver is estimated.In a system of utilizing AMC, the user in center of housing estate is assigned with more modulation or the code rate (as 64 quadrature amplitude modulation (Quadrature Amplitude Modulation is called for short QAM), 1/2 code check Trubo code) of high-order conventionally; And be assigned with the modulation of lower-order or code rate (as QPSK(quarternary phase-shift keying (QPSK) signal), 1/2 Rate Turbo Codes in the user of cell edge).
System is used AMC to have following advantage: the first, and the UE good in channel situation can distribute higher modulation system and speed, can improve like this average data throughput of whole community; The second, the link level AMC changing based on modulation coding mode can reduce the variation of disturbing with respect to the method for transmission power control; The 3rd, AMC is combined with time domain, frequency domain dispatching, utilize the rapid fading feature of UE can make UE in low decline state.
Due in LTE FDD system, UE reports the benchmark moment of CSI and base station actual schedule moment to pass through a time delay, when in the time of channel, change (fluctuation of time domain) is more serious, the actual channel deviation in these two moment is larger, and the CSI reporting based on UE carries out the performance that AMC cannot guarantee that it is optimum.
A kind of method that the embodiment of the present invention provides CSI to report, according to the channel information of at least one historical juncture t (n-1) and current time t (n), obtain t (n+ Δ channel information t), and (n+ Δ channel information t) carries out relevant CSI and measures based on t, report base station side, thereby the existing delay problem of existing scheme solving, to maximize the actual effect that guarantees AMC.
Should understand, the technical scheme of the embodiment of the present invention can be applied to various communication systems, for example: global system for mobile telecommunications (Global System of Mobile communication, be called for short GSM) system, code division multiple access (Code Division Multiple Access, be called for short CDMA) system, Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, be called for short WCDMA) system, GPRS (General Packet Radio Service, be called for short GPRS), Long Term Evolution (Long Term Evolution, be called for short LTE) system, LTE Frequency Division Duplexing (FDD) (Frequency Division Duplex, be called for short FDD) system, LTE time division duplex (Time Division Duplex, be called for short TDD), universal mobile telecommunications system (Universal Mobile Telecommunication System, be called for short UMTS), the interconnected inserting of microwave in the whole world (Worldwide Interoperability for Microwave Access, be called for short WiMAX) communication system etc.
Will also be understood that, in embodiments of the present invention, subscriber equipment (User Equipment, be called for short UE) can be referred to as terminal (Terminal), travelling carriage (Mobile Station, be called for short MS), mobile terminal (Mobile Terminal) etc., this subscriber equipment can be through wireless access network (Radio Access Network, be called for short RAN) communicate with one or more core net, for example, subscriber equipment can be mobile phone (or being called " honeycomb " phone), there is the computer of mobile terminal etc., for example, subscriber equipment can also be portable, pocket, hand-hold type, built-in computer or vehicle-mounted mobile device, they and wireless access network switched voice and/or data.
In embodiments of the present invention, base station can be base station (the Base Transceiver Station in GSM or CDMA, be called for short BTS), also can be the base station (NodeB in WCDMA, be called for short NB), it can also be the evolved base station (Evolutional Node B is called for short ENB or e-NodeB) in LTE.Should also be understood that in embodiments of the present invention, base station can also be the miscellaneous equipment with scheduling feature, for example, have the UE of scheduling feature etc., and the embodiment of the present invention is not as limit.
For convenience, following embodiment will be take base station, UE describes as example, but the present invention is not limited to this.
Shown in Fig. 2 and Fig. 3, Fig. 2 shows CSI in the present invention and reports and the relation of dispatching cycle, and Fig. 3 shows the flow process of the method for the reporting source of channel state information that one embodiment of the invention provides; The method of the reporting source of channel state information in the present embodiment is as described below:
301, UE receives the first signaling that base station issues, and described the first signaling comprises: described UE reports the moment T of CSI.
For instance, described UE reports the moment T of CSI to can be moment of described UE periodic report CSI, or described UE reports the moment T of CSI to can be the described UE of interim triggering to report the moment of CSI.
302, UE obtains reporting the moment t (n) of described CSI according to described moment T, when moment t (n), (n+ Δ is the 3rd channel estimation value in moment t), and obtains CSI according to described the 3rd channel estimation value to obtain t according to the first channel estimation value and at least one second channel estimated value;
303, UE reports the CSI obtaining to described base station; So that described base station configures the adaptive modulation and coding AMC of described UE according to described CSI;
Wherein, the channel estimation value obtaining when described the first channel estimation value is moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n);
Described second channel estimated value is the channel estimation value before described the first channel estimation value of obtaining of described UE;
N is for reporting time point, and Δ t is the time delay time period of the described UE time delay of UE side and time delay composition of base station side while reporting CSI.
In the present embodiment, if described UE reports the moment T of CSI to can be the moment of described UE periodic report CSI, the cycle is p, and as shown in Figure 2, now, n is for reporting time point, and n gets natural number.
Report moment of CSI if described UE reports the moment T of CSI to can be the described UE of interim triggering, obtain reporting the moment t (n) of described CSI according to described moment T, now, the desirable any positive integer of n.
In a kind of application scenarios that can realize, above-mentioned time delay time period Δ t can be in UE pre-configured, i.e. empirical value of UE, as 3-5ms etc.That is to say, Δ t is an empirical value, in different wireless network standards, may have different results, and UE can be used as a parameter configuration in CSI Measurement Algorithm.
In the application scenarios that can realize at another kind, above-mentioned time delay time period Δ t also can be base station and is handed down to UE's, portability time delay time period Δ t in the first signaling issuing to UE as base station, now, this time delay time period Δ t is a time delay time period of base station prediction, as 3ms, 4ms, 5ms etc.
Above-described embodiment is only illustrated the time delay time period, does not limit particular content and the concrete length of time delay time period.
In other embodiments, base station can also issue time delay time period Δ t to UE as the second independent signaling by other signalings, this second signaling can be that base station issues by semi-static mode, or base station issues by dynamical fashion, and the present embodiment does not limit it.
In addition, in conjunction with Fig. 2, above-mentioned time delay time period Δ t can comprise: the time delay Δ t of the UE side shown in Fig. 2
1, Δ t
2; The time delay Δ t of base station side
3, Δ t
4with Δ t
5;
Wherein, the first above-mentioned channel estimation value can be moment t (n-Δ t
1) time the current channel estimation value that obtains, Δ t
2the propagation delay Δ t of the CSI process reporting to base station for UE
2;
Δ t
3for the process processing of base band and the reporting time delay Δ t of reporting base station scheduler in base station
3;
Δ t
4for the processing delay Δ t of base station dispatcher in base station
4;
Δ t
5the AMC obtaining for base station is issued to the propagation delay Δ t of UE
5.
Above-mentioned Δ t
1, Δ t
2, Δ t
3, Δ t
4with Δ t
5be empirical value.
Certainly, in actual applications, if UE carries out in real time to the prediction of channel, the current channel estimation value obtaining when the first above-mentioned channel estimation value also can be moment t (n).
The first above-mentioned channel estimation value can be the current channel estimation value that moment t (n) obtains, or moment t (n) obtain before and acquisition time for channel estimation value corresponding to moment nearest apart from moment t (n) is (as the t of Fig. 1 illustrated (n-Δ t
1) channel estimation value corresponding to moment).In Fig. 2, the first channel estimation value can be t (n-Δ t
1) channel estimation value corresponding to moment.
From above-described embodiment, the method of the reporting source of channel state information of the present embodiment, receive by UE the first signaling that base station sends, while obtaining reporting the moment t (n) of CSI according to the first signaling, when moment t (n), (n+ Δ is the 3rd channel estimation value in moment t) to obtain t according to the first channel estimation value and at least one second channel estimated value, and then can report to base station the CSI obtaining according to the 3rd channel estimation value, (n+ Δ is the AMC of CSI configuration UE corresponding to moment t) according to t to make base station, can solve the problem that time delay when UE reports CSI in prior art cannot guarantee the AMC that obtains optimal performance.
In the preferred implementation of one, above-mentioned step 302 can be specially following step 302 ', as shown in Figure 4:
302 ', UE obtains reporting the moment t (n) of described CSI according to described moment T, when moment t (n), according to the first channel estimation value H (n) and second channel estimated value H (n-1) obtain t (n+ Δ t) the 3rd channel estimation value H in moment (n+ Δ t), and according to described the 3rd channel estimation value H (n+ Δ t) obtains CSI;
Wherein, the channel estimation value that the first channel estimation value H (n) obtains while being moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n), and the channel estimation value that described second channel estimated value H (n-1) obtains while being moment t (n-1) or moment t (n-1) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n-1).
As shown in Figure 2, the first above-mentioned channel estimation value H (n) can be UE at t (the n-Δ t nearest apart from moment t (n)
1) channel estimation value that obtains of moment, the channel estimation value that second channel estimated value H (n-1) obtains during for moment t (n-1).
In a kind of mode that can realize, in UE side, UE can according to H (n+ Δ t)=f (H (n), H (n-1)) (n+ Δ is t) to obtain the 3rd channel estimation value H, wherein, the computational process of f (H (n), H (n-1)) function can be with reference to the computational process of current known Winner FIR algorithm in the industry and Kalman filtering algorithm, and the present embodiment no longer describes in detail.
That is to say, the pre-stored computational process that has similar Winner FIR algorithm or Kalman filtering algorithm in UE, and then obtain the first channel estimation value H (n) and second channel estimated value H (n-1) afterwards at UE, (n+ Δ is t) to obtain the 3rd channel estimation value H according to the computational process of the similar Winner FIR algorithm prestoring or Kalman filtering algorithm.
In the present embodiment, (n+ Δ t) can adopt the first channel estimation value H (n) and second channel estimated value H (n-1) preferably to calculate the 3rd channel estimation value H.Because H (n-1) obtains through above-mentioned recursive calculation.
In other embodiments, (n+ Δ t) also can adopt the first channel estimation value H (n), second channel estimated value H (n-1) and another channel estimation value to calculate as H (n-2) etc. to calculate the 3rd channel estimation value H.The present embodiment, only for illustrating, does not limit occupation mode.
Alternatively, in step 302, above-mentioned UE reports the CSI obtaining according to described the 3rd channel estimation value to described base station, can comprise one or more in following information:
Report the CQI obtaining according to described the 3rd channel estimation value to described base station;
Report the PMI obtaining according to described the 3rd channel estimation value to described base station;
Report the RI obtaining according to described the 3rd channel estimation value to described base station.
Thus, the CSI that base station can report according to UE carries out relevant AMC and controls, the content such as channel coding rate and modulation system of U E is for example set, fluctuates more seriously to realize in the time domain of channel, the CSI reporting based on UE carries out AMC can guarantee to obtain optimum performance.
For instance, in LTE system, base station sends high-level signaling (as radio resource control (Radio Resource Control to UE, be called for short RRC) signaling or by Physical Downlink Control Channel (Physical Downlink Control Channel, be called for short PDCCH) carrying Downlink Control Information (Downlink Control Information, be called for short DCI) etc.), this high-level signaling is for informing the report cycle of UE and reporting the moment etc., for example, can comprise that periodic report moment or interim triggering report the moment etc.
In concrete application, this high-level signaling can be that base station issues by semi-static mode, can be also to issue by dynamical fashion, and the present embodiment does not limit it.
And then, UE is after receiving above-mentioned high-level signaling, can obtain reporting according to high-level signaling the moment t (n) of CSI, in the time reporting moment t (n), UE adopts the second channel estimated value H (n-1) that in up-to-date the first channel estimation value H (n) obtaining and UE, buffer memory obtained in the past, carry out the channel estimating of the 3rd channel estimation value, obtain t (n+ Δ t) the 3rd channel estimation value H in moment (n+ Δ t);
(n+ Δ t) afterwards obtaining the 3rd channel estimation value H for UE, based on t (n+ Δ t) the 3rd channel estimation value H in moment (n+ Δ t) carries out relevant CSI and calculates, as UE obtains CQI by calculating SINR, precoding vector by calculated gains maximum obtains PMI, obtains RI etc. by the order information of calculating channel.
For instance, UE according to the 3rd channel estimation value obtain CQI, PMI and RI be current be known account form in the industry, the present embodiment no longer describes in detail.In LTE system, UE obtains CSI, can use reference signal, as channel state information reference signals (Channel StateI nformation Reference Signal, be called for short CSI-RS), community public reference signal (Cell-common Reference Signal, be called for short CRS), the special employing signal of demodulation (Dedicated Reference Signal, be called for short DRS) etc.
The CSI obtaining is reported base station by UE, make the CSI that base station can report according to UE carry out relevant AMC control, channel coding rate and the modulation system of UE are set, and then make UE after receiving AMC, guarantee that the AMC after the process time delay time period can mate with current actual channel, thereby guaranteed the performance of AMC optimum.
Should be understood that the channel estimation value that above-mentioned UE obtains at every turn, as the first channel estimation value, second channel estimated value, the 3rd channel estimation value etc. can be stored in UE, so that the M channel estimation value of the calculating in later stage uses.M is natural number.
Above-mentioned UE can obtain the channel estimation value in corresponding moment always.
Said method can effectively be alleviated the reporting status information of channel causing due to time delay and not mate with actual schedule moment channel condition information, make UE in the time receiving AMC, mate as much as possible current channel, thereby increase AMC effect, improve the spectrum efficiency of whole community.
According to the embodiment of the present invention on the other hand, the embodiment of the present invention also provides a kind of subscriber equipment, and as shown in Figure 5, the subscriber equipment in the present embodiment comprises: receiving element 51, acquiring unit 52 and transmitting element 53;
Wherein, the first signaling that receiving element 51 issues for receiving base station, described the first signaling comprises: the moment T of reported by user equipment UE channel condition information CSI;
Acquiring unit 52 is for after described receiving element 51 receives described the first signaling, obtain reporting the moment t (n) of described CSI according to described moment T, when moment t (n), (n+ Δ is the 3rd channel estimation value in moment t), and obtains CSI according to described the 3rd channel estimation value to obtain t according to the first channel estimation value and at least one second channel estimated value;
Transmitting element 53, for after described acquiring unit 52 obtains described CSI, reports the CSI obtaining to described base station; So that described base station configures the adaptive modulation and coding AMC of described UE according to described CSI;
Wherein, the channel estimation value obtaining when described the first channel estimation value is moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n);
Described second channel estimated value is the channel estimation value before described the first channel estimation value of obtaining of described UE;
N is for reporting time point, and Δ t is the time delay time period of the described UE time delay of UE side and time delay composition of base station side while reporting CSI.
Optionally realize in scene in one, described acquiring unit 52 specifically for, after described receiving element 51 receives described the first signaling, obtain reporting the moment t (n) of described CSI according to described moment T, when moment t (n), according to the first channel estimation value H (n) and second channel estimated value H (n-1) obtain t (n+ Δ t) the 3rd channel estimation value H in moment (n+ Δ t), and according to described the 3rd channel estimation value H (n+ Δ t) obtains CSI;
Wherein, the channel estimation value that the first channel estimation value H (n) obtains while being moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n), and the channel estimation value that described second channel estimated value H (n-1) obtains while being moment t (n-1) or moment t (n-1) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n-1).
Alternatively, it is the moment of described UE periodic report CSI that described UE reports the moment T of CSI, or it is the moment that the interim described UE of triggering reports CSI that described UE reports the moment T of CSI.
In addition, it should be understood that described CSI that above-mentioned acquiring unit obtains can comprise one or more in following information: the channel quality indicator (CQI) that described UE obtains according to described the 3rd channel estimation value;
The pre-coding matrix indication PMI that described UE obtains according to described the 3rd channel estimation value;
The order indication RI that described UE obtains according to described the 3rd channel estimation value etc.
In addition, in actual applications, described receiving element 51 specifically for,
Receive the first signaling that base station issues, described the first signaling comprises: the moment T of reported by user equipment UE channel condition information CSI, and time delay time period Δ t.
The CSI that subscriber equipment in the present embodiment sends to base station, can make the AMC that base station obtains according to CSI can effectively alleviate the reporting status information of channel and the unmatched problem of actual schedule moment channel condition information that cause due to time delay, and then make UE in the time receiving AMC, mate as much as possible current channel, thereby increase AMC effect, improve the spectrum efficiency of whole community.
It should be noted that, in the embodiment of above subscriber equipment, the division of each functional unit only illustrates, can be as required in practical application, the facility of the configuration requirement of for example corresponding hardware or the realization of software is considered, completed by different functional units and above-mentioned functions is distributed, be divided into different functional units by the internal structure of described subscriber equipment, to complete all or part of function described above.And, in practical application, corresponding functional unit in the present embodiment can be to be realized by corresponding hardware, also can be completed by the corresponding software of corresponding hardware implement, for example, aforesaid transmitting element, can be to have the hardware of carrying out aforementioned transmitting element function, for example reflector, thus can be also general processor or other hardware devices that can carry out corresponding computer program and complete aforementioned function; For another example, aforesaid receiving element, can be to have the hardware of aforementioned receiving element function of execution, for example receiver, thus can be also general processor or other hardware devices that can carry out corresponding computer program and complete aforementioned function; (each embodiment that this specification provides can apply foregoing description principle).
According to the one side again of the embodiment of the present invention, the embodiment of the present invention also provides a kind of subscriber equipment, and as shown in Figure 6, the subscriber equipment in the present embodiment comprises: memory 61 and processor 62;
Wherein, memory 61 and processor 62 are coupled, and memory 61 is for storing the information that comprises the performed program routine of described processor 62;
Described processor 62 is coupled with memory 61, for controlling the execution of described program routine, specifically comprises:
Receive the first signaling that base station issues, described the first signaling comprises: the moment T of described UE reporting status information of channel CSI;
Obtain reporting the moment t (n) of described CSI according to described moment T, when moment t (n), (n+ Δ is the 3rd channel estimation value in moment t), and obtains CSI according to described the 3rd channel estimation value to obtain t according to the first channel estimation value and at least one second channel estimated value;
Report the CSI obtaining to described base station; So that described base station configures the adaptive modulation and coding AMC of described UE according to described CSI;
Wherein, the channel estimation value obtaining when described the first channel estimation value is moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n);
Described second channel estimated value is the channel estimation value before described the first channel estimation value of obtaining of described UE;
N is for reporting time point, and Δ t is the time delay time period of the described UE time delay of UE side and time delay composition of base station side while reporting CSI.
For instance, time delay time period Δ t can be in described UE pre-configured, or, time delay time period Δ t can be described base station pre-configured and by transmitting signaling downwards to UE's.
Alternatively, processor 62 specifically for, (t) the 3rd channel estimation value H in moment is (n+ Δ t), for n+ Δ to obtain t according to the first channel estimation value H (n) and second channel estimated value H (n-1)
Wherein, the channel estimation value that the first channel estimation value H (n) obtains while being moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n), and the channel estimation value that described second channel estimated value H (n-1) obtains while being moment t (n-1) or moment t (n-1) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n-1).
In the present embodiment, processor 62 reports the CSI obtaining according to described the 3rd channel estimation value to described base station, comprises one or more in following information:
Report the CQI obtaining according to described the 3rd channel estimation value to described base station;
Report the PMI obtaining according to described the 3rd channel estimation value to described base station;
Report the RI obtaining according to described the 3rd channel estimation value to described base station.
Memory in the present embodiment and processor all can be realized by logical integrated circuit.
Subscriber equipment in the present embodiment can solve in prior art time delay when UE reports CSI and cannot guarantee the problem of the AMC that obtains optimal performance.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can complete by the relevant hardware of program command.Aforesaid program can be stored in a computer read/write memory medium.This program, in the time carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a method for reporting source of channel state information, is characterized in that, comprising:
User equipment (UE) receives the first signaling that base station issues, and described the first signaling comprises: the moment T of described UE reporting status information of channel CSI;
Obtain reporting the moment t (n) of described CSI according to described moment T, when moment t (n), (n+ Δ is the 3rd channel estimation value in moment t), and obtains CSI according to described the 3rd channel estimation value to obtain t according to the first channel estimation value and at least one second channel estimated value;
Report the CSI obtaining to described base station; So that described base station configures the adaptive modulation and coding AMC of described UE according to described CSI;
Wherein, the channel estimation value obtaining when described the first channel estimation value is moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n);
Described second channel estimated value is the channel estimation value before described the first channel estimation value of obtaining of described UE;
N is for reporting time point, and Δ t is the time delay time period of the described UE time delay of UE side and time delay composition of base station side while reporting CSI.
2. method according to claim 1, is characterized in that, described according to the first channel estimation value and at least one second channel estimated value obtain t (n+ Δ is the 3rd channel estimation value in moment t), comprising:
(t) the 3rd channel estimation value H in moment is (n+ Δ t), for n+ Δ to obtain t according to the first channel estimation value H (n) and second channel estimated value H (n-1)
Wherein, the channel estimation value that the first channel estimation value H (n) obtains while being moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n), and the channel estimation value that described second channel estimated value H (n-1) obtains while being moment t (n-1) or moment t (n-1) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n-1).
3. method according to claim 1 and 2, is characterized in that, it is the moment of described UE periodic report CSI that described UE reports the moment T of CSI, or it is the moment that the interim described UE of triggering reports CSI that described UE reports the moment T of CSI.
4. according to the arbitrary described method of claims 1 to 3, it is characterized in that the described CSI obtaining according to described the 3rd channel estimation value that reports to described base station comprises one or more in following information:
Report the channel quality indicator (CQI) obtaining according to described the 3rd channel estimation value to described base station;
Report the pre-coding matrix indication PMI obtaining according to described the 3rd channel estimation value to described base station;
Report the order indication RI obtaining according to described the 3rd channel estimation value to described base station.
5. according to the arbitrary described method of right 1 to 4, it is characterized in that, described the first signaling also comprises: time delay time period Δ t;
Or described time delay time period Δ t is pre-configured in described UE.
6. a subscriber equipment, is characterized in that, comprising:
Receiving element, the first signaling issuing for receiving base station, described the first signaling comprises: the moment T of reported by user equipment UE channel condition information CSI;
Acquiring unit, for after described receiving element receives described the first signaling, obtain reporting the moment t (n) of described CSI according to described moment T, when moment t (n), (n+ Δ is the 3rd channel estimation value in moment t), and obtains CSI according to described the 3rd channel estimation value to obtain t according to the first channel estimation value and at least one second channel estimated value;
Transmitting element, for after described acquiring unit obtains described CSI, reports the CSI obtaining to described base station; So that described base station configures the adaptive modulation and coding AMC of described UE according to described CSI;
Wherein, the channel estimation value obtaining when described the first channel estimation value is moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n);
Described second channel estimated value is the channel estimation value before described the first channel estimation value of obtaining of described UE;
N is for reporting time point, and Δ t is the time delay time period of the described UE time delay of UE side and time delay composition of base station side while reporting CSI.
7. subscriber equipment according to claim 6, is characterized in that, described acquiring unit, specifically for
After described receiving element receives described the first signaling, obtain reporting the moment t (n) of described CSI according to described moment T, when moment t (n), according to the first channel estimation value H (n) and second channel estimated value H (n-1) obtain t (n+ Δ t) the 3rd channel estimation value H in moment (n+ Δ t), and according to described the 3rd channel estimation value H (n+ Δ t) obtains CSI;
Wherein, the channel estimation value that the first channel estimation value H (n) obtains while being moment t (n) or moment t (n) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n), and the channel estimation value that described second channel estimated value H (n-1) obtains while being moment t (n-1) or moment t (n-1) obtain before and acquisition time is apart from the nearest channel estimation value of moment t (n-1).
8. according to the subscriber equipment described in claim 6 or 7, it is characterized in that, it is the moment of described UE periodic report CSI that described UE reports the moment T of CSI, or it is the moment that the interim described UE of triggering reports CSI that described UE reports the moment T of CSI.
9. according to the arbitrary described subscriber equipment of claim 6 to 8, it is characterized in that, described CSI comprises one or more in following information:
The channel quality indicator (CQI) that described UE obtains according to described the 3rd channel estimation value;
The pre-coding matrix indication PMI that described UE obtains according to described the 3rd channel estimation value;
The order indication RI that described UE obtains according to described the 3rd channel estimation value.
10. according to the arbitrary described subscriber equipment of claim 6 to 9, it is characterized in that, described receiving element, specifically for,
Receive the first signaling that base station issues, described the first signaling comprises: the moment T of reported by user equipment UE channel condition information CSI, and time delay time period Δ t.
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