CN101588592B - Method for estimating uplink channel quality in time division duplex system - Google Patents
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Abstract
The invention relates to the wireless communication field, and discloses a method for estimating uplink channel quality in a time division duplex system, which can not only greatly decrease the cost for estimating the uplink quality, but also guarantee a higher estimating precision. The base station receives channel estimation CDL and interference estimation IDL of a downlink from the terminal. If the ratio between the power of CDL and the power of IDL is larger than a predetermined first threshold, uplink channel estimation CUL is equal to CDL, otherwise the base station dispatches the terminal to send out exploration signals, and CUL is estimated through the measurement of the exploration signals.
Description
Technical field
The present invention relates to wireless communication field, particularly uplink signal-channel quality estimation technique in time division duplex (Time Division Duplex is called for short " the TDD ") system.
Background technology
Time division duplex is called for short TDD, is a kind of communication mode of GSM, this mode receiving and sending messages between base station and travelling carriage; It is form with the burst sequence; On same carrier frequency, replace and transmit, promptly receiving-transmitting sides is sent out in turn and is received, or title " ping-pong ".So just can on a carrier frequency, realize a duplex channel, thereby improve the availability of frequency spectrum.
In the bidirectional mobile communication system; In order to make full use of channel capacity; Transmitting terminal need determine the coded modulation form that current transmission needs adopt according to channel status, is called adaptive modulation and coding (Adaptive Modulation and Coding is called for short " AMC ").Under multi-user's situation, the base station can be dispatched a plurality of users' transmission or reception according to channel status, promotes thereby obtain considerable power system capacity, claims multi-user diversity gain (multi-user diversity gain) again.The use of all these enhancement techniques all depends on the channel condition information (Channel State Informationat Transmitter is called for short " CSIT ") that transmitting terminal is recognized.
Usually, channel condition information can obtain at receiving terminal through pilot tone etc. easily; In order to let transmitting terminal utilize channel condition information, need receiving terminal channel information to be transmitted back to transmitting terminal timely and effectively through reverse link.
In present bidirectional mobile communication system, the part reverse chain-circuit capacity is used to the channel condition information of loopback forward link.Specifically, in cell mobile communication systems, channel quality estimation is carried out to down link in the terminal, obtains the channel quality indicator (CQI) of down link
DL, the terminal is with CQI
DLReturn to the base station through up link, by the base station according to CQI
DLDetermine Modulation and Coding Scheme and user's scheduling of descending transmission data.In order in the bandwidth of broad, the dispatching uplink user to send data, detectable signal is sent in notice terminal, base station in the frequency band of broad, and the base station receives the channel quality indicator (CQI) of detectable signal and estimating uplink
UL, again according to CQI
ULThe Modulation and Coding Scheme of decision uplink data sending and user's scheduling.
The problem of technique scheme is that the ascending channel detecting cost is too big.Because detectable signal will be sent in the terminal in the frequency band of broad, so power consumption of terminal is bigger, and resource overhead is bigger.Detectable signal can take valuable Radio Resource, also needs corresponding other resource (like processor resource etc.) to be used for the processing to detectable signal.Because in the base station many terminals are arranged usually; If distribute mutual independent radio resources for the detectable signal of different terminal; Then can take too much Radio Resource; So the time regular meeting detectable signal is sent at a plurality of terminals on identical running time-frequency resource situation appears, this moment, these terminals can phase mutual interference, caused the base station to CQI
DLEstimated accuracy reduce.
Summary of the invention
The object of the present invention is to provide uplink signal-channel quality method of estimation and base station in a kind of tdd systems, both can reduce the cost that uplink signal-channel quality is estimated greatly, can guarantee high estimation accuracy again.
The invention discloses uplink signal-channel quality method of estimation in a kind of tdd systems, may further comprise the steps:
The channel estimating C of base station receiving downlink from the terminal
DLWith Interference Estimation I
DL, or be equivalent to C
DLAnd I
DLInformation;
The Interference Estimation I of the up link at terminal is estimated in the base station
UL
If satisfy predetermined condition, the channel estimating C of up link then
UL=C
DL, otherwise detectable signal is sent at the base station scheduling terminal, estimates C through measuring this detectable signal
UL, wherein predetermined condition is C
DLPower and I
DLThe ratio of power greater than the first predetermined thresholding.
The invention also discloses a kind of base station, comprising based on time division duplex:
The TDD sender is used for sending signal through down link to the terminal;
The TDD receiver is used for receiving from up link the signal of self terminal, comprising the channel estimating C of receiving downlink
DLWith Interference Estimation I
DL, or be equivalent to C
DLAnd I
DLInformation;
The UL compensation unit, the signal that is used for receiving according to the TDD receiver is estimated the Interference Estimation I of the up link at terminal
UL
The UL channel estimating unit is used for the channel estimating C according to the signal estimating uplink of TDD receiver reception
UL
The SRS sending controling unit is used for sending the signaling scheduling terminal through the TDD sender and sends detectable signal;
Control unit is used to judge whether current channel estimating and Interference Estimation satisfy predetermined condition, if satisfy then with C
ULBe taken as and C
DLIdentical value, otherwise indication SRS sending controling unit dispatch terminal sends detectable signal, and the detectable signal of by the UL channel estimating unit TDD receiver being received again estimates to obtain C
UL, wherein, predetermined condition is C
DLPower and I
DLThe ratio of power greater than the first predetermined thresholding.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
If C
DLPower and I
DLThe ratio of power greater than the first predetermined thresholding, explain that then the signal of down link has sufficient intensity with respect to interference, this moment C
DLValue be believable, can utilize the up-downgoing symmetry of TDD system to get C
UL=C
DLEstimate C with respect to base station in the prior art through the detectable signal that detects self terminal
ULScheme, technical scheme of the present invention greatly reduces the cost that uplink signal-channel quality is estimated.
If C
DLPower and I
DLThe ratio of power less than the first predetermined thresholding, explain that then interference is strong excessively for the signal of down link, C
DLValue insincere, dispatch terminal sent detectable signal and estimated C again this moment
ULEven descending like this interference is very serious, the base station still can obtain uplink signal-channel quality exactly and estimate.
Further, increased C
DLPower and I
ULThe ratio of power less than the condition of predetermined second threshold, work as C
DLPower and I
ULThe ratio of power during less than second thresholding, uplink interference is with respect to obtaining C
ULBigger, do not have result accurately even sent detectable signal this moment, not as directly utilizing the up-downgoing symmetry of TDD system to get C yet
UL=C
DLThereby reduced the chance that detectable signal is sent at the terminal further, further reduced the cost that uplink signal-channel quality is estimated.Modern many communication systems are from disturbing; Like system, when uplink interference is strong based on code division multiple access (Code Division Multiple Access, abbreviation " CDMA "); Communicate by letter just the busy period probably; The transmission that reduce detectable signal this moment can reduce the interference to numerous other terminals of communicating by letter, and improves communication quality on the whole, and is bigger to the meaning of system.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method execution mode;
Fig. 2 is the structured flowchart of base station of the present invention and terminal execution mode.
Embodiment
In following narration, many ins and outs have been proposed in order to make the reader understand the application better.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that execution mode of the present invention is done to describe in detail further below.
The execution mode of uplink signal-channel quality method of estimation is as shown in Figure 1 in the TDD system.
In step 101, the terminal is detected according to received signal and is estimated, obtains the channel estimating C of down link
DLWith Interference Estimation I
DL
After this get into step 102, C is sent at the terminal
DLAnd I
DL, the base station receives C from up link
DLAnd I
DLExcept sending C
DLAnd I
DL, the terminal also can be sent and C
DLAnd I
DLOut of Memory of equal value, the for example channel quality indicator (CQI) of down link
DLAnd I
DLCQI is received in the base station
DLAnd I
DLAfter, can pass through formula C
DL=CQI
DL* I
DLCalculate C
DL
After this get into step 103, the Interference Estimation I of the up link at terminal is estimated at the terminal
ULIn an example, the base station obtains I through the energy on the ascending resource piece of measuring this sub-district and not dispatching
ULValue.The benefit of this method is can not increase any burden of air interface Radio Resource.Certainly the base station also can obtain I according to other mode
UL, for example can decode and obtain Y (decode procedure can comprise error correction step) the signal X that receives, Y is carried out verification, if verification is passed through, then again Y being encoded by the mode at terminal obtains X ', just can estimate I from the difference of X ' and X
UL
After this get into step 104, whether base station judges satisfies predetermined condition, if satisfied predetermined condition then get into step 108, otherwise gets into step 105.
In an example, predetermined condition is: C
DLPower and I
DLThe ratio of power greater than the first predetermined thresholding.If C
DLPower and I
DLThe ratio of power greater than the first predetermined thresholding, explain that then the signal of down link has sufficient intensity with respect to interference, this moment C
DLValue be believable, can utilize the up-downgoing symmetry of TDD system to get C
UL=C
DLEstimate C with respect to base station in the prior art through the detectable signal that detects self terminal
ULScheme, greatly reduce the cost that uplink signal-channel quality is estimated.If C
DLPower and I
DLThe ratio of power less than the first predetermined thresholding, explain that then interference is strong excessively for the signal of down link, C
DLValue insincere, dispatch terminal sent detectable signal and estimated C again this moment
ULEven descending like this interference is very serious, the base station still can obtain uplink signal-channel quality exactly and estimate.
In another example, predetermined condition is: C
DLPower and I
DLThe ratio of power greater than first thresholding, perhaps C
DLPower and I
ULThe ratio of power less than predetermined second threshold.Previous relatively example has increased C
DLPower and I
ULThe ratio of power less than the condition of predetermined second threshold, work as C
DLPower and I
ULThe ratio of power during less than second thresholding, uplink interference is bigger, does not also have result accurately even sent detectable signal this moment, not as directly utilizing the up-downgoing symmetry of TDD system to get C
UL=C
DLThereby reduced the chance that detectable signal is sent at the terminal further, further reduced the cost that uplink signal-channel quality is estimated.Modern many communication systems are from disturbing; When uplink interference is strong, communicate by letter just the busy period probably, the transmission that reduce detectable signal this moment can reduce the interference to numerous other terminals of communicating by letter; Improve communication quality on the whole, bigger to the meaning of system.
Wherein, first thresholding, second thresholding are predefined values, can obtain first thresholding and second thresholding through emulation or to the statistics of historical data.
In step 105, detectable signal is sent at the base station scheduling terminal.Concrete way is that a specific signaling (or title " message ") is sent out to the terminal in the base station, and detectable signal is sent according to this signaling in the terminal.
After this get into step 106, the base station receives detectable signal.
After this get into step 107, the base station according to the detectable signal that is received to C
DLEstimate.After this get into step 109.
In step 108, utilize the symmetry of TDD system up-downgoing channel, the base station is directly with C
DLValue as C
ULValue, C In some examples of the invention
ULCarry out certain correction possibly earlier.After this get into step 109.
In step 109, the base station is according to C
DLAnd I
DLCalculate CQI
DL, according to C
ULAnd I
ULCalculate CQI
ULWherein, CQI is channel quality indication (Channel Quality Indicator).
After this get into step 110, the base station is according to CQI
ULDetermine the uplink modulation encoding scheme and carry out uplink scheduling for the terminal, the base station is according to CQI
DLDecision down link Modulation and Coding Scheme and for carrying out descending scheduling in the terminal.
Method execution mode of the present invention can be realized with software, hardware, firmware or the like mode.No matter the present invention be with software, hardware, or the firmware mode realize; Instruction code can be stored in the memory of computer-accessible of any kind (for example permanent or revisable; Volatibility or non-volatile; Solid-state or non-solid-state, medium fixing or that change or the like).Equally; Memory can for example be programmable logic array (Programmable Array Logic; Abbreviation " PAL "), random access memory (Random Access Memory; Abbreviation " RAM "), programmable read only memory (Programmable Read Only Memory is called for short " PROM "), read-only memory (Read-Only Memory is called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM; Abbreviation " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") or the like.
Below in the explanation TDD system based on the execution mode at base station and the terminal of TDD, wherein the structured flowchart at the terminal of base station is as quarrelling shown in 2.
Base station based on TDD comprises:
TDD sender 201 is used for sending signal through down link to the terminal.
UL channel estimating unit 204 is used for the channel estimating C according to the signal estimating uplink of TDD receiver 202 receptions
UL
SRS sending controling unit 205 is used for sending the signaling scheduling terminal through TDD sender 201 and sends detectable signal (Sounding Reference Signal is called for short " SRS ").
In an example, predetermined condition is: C
DLPower and I
DLThe ratio of power greater than the first predetermined thresholding.At another example, predetermined condition is: C
DLPower and I
DLThe ratio of power greater than first thresholding, perhaps C
DLPower and I
ULThe ratio of power less than predetermined second threshold.
Obtain C
ULAfterwards, the base station can be further according to C
ULAnd I
ULCalculate CQI
UL, determine the uplink modulation encoding scheme and be that uplink scheduling is carried out at the terminal with this.The base station can also be according to C
DLAnd I
DLCalculate CQI
DL, determine the down link Modulation and Coding Scheme and be that descending scheduling is carried out at the terminal with this.
Terminal based on TDD comprises:
DL channel estimating unit 213, the signal that is used for receiving according to TDD receiver 211 is estimated C
DL
Need to prove; Each unit mentioned in the execution mode at base station and terminal among the present invention and sending and receiving letter machine all are logical blocks, and physically, a logical block can be a physical location; It also can be the part of a physical location; Can also realize that the physics realization mode of these logical blocks itself is not most important with the combination of a plurality of physical locations, the combination of the function that these logical blocks realized is the key that just solves technical problem proposed by the invention.For example, the TDD receiver in the execution mode of base station 202 receives CQI
DLAnd I
DLIn addition, can also receive other signal; And for example, DL channel estimating unit 213 can realize in same physical location with DL compensation unit 214 in the execution mode of terminal; Or the like.
In addition, for outstanding innovation part of the present invention, above-mentioned base station of the present invention and terminal execution mode will not introduced with solving the not too close unit of technical problem relation proposed by the invention, and this does not show that there is not other unit in above-mentioned execution mode.For example, can also there be baseband processing unit, antenna or the like in the base station in the execution mode of base station; Can also there be display screen, microphone, earphone, keyboard or the like in terminal in the execution mode of terminal.
The related equipment of this execution mode can be used for the flow process that the Method Of Accomplishment execution mode is mentioned.Therefore all ins and outs of in the method execution mode, mentioning are still effective in this execution mode, in order to reduce repetition, repeat no more here.
Though through with reference to some preferred embodiment of the present invention, the present invention is illustrated and describes, those of ordinary skill in the art should be understood that and can do various changes to it in form with on the details, and without departing from the spirit and scope of the present invention.
Claims (6)
1. uplink signal-channel quality method of estimation in the tdd systems is characterized in that, may further comprise the steps:
The channel estimating C of base station receiving downlink from the terminal
DLWith Interference Estimation I
DLThe Interference Estimation I of the up link at said terminal is estimated in said base station
UL
If satisfy predetermined condition, the channel estimating C of up link then
UL=C
DL, otherwise detectable signal is sent at said base station scheduling terminal, estimates C through measuring this detectable signal
ULSaid predetermined condition is:
C
DLPower and I
DLThe ratio of power greater than first thresholding, perhaps C
DLPower and I
ULThe ratio of power less than predetermined second threshold.
2. uplink signal-channel quality method of estimation in the tdd systems according to claim 1 is characterized in that the Interference Estimation I of the up link at said terminal is estimated in said base station
ULStep in,
Said base station obtains I through the energy on the ascending resource piece of measuring this sub-district and not dispatching
ULValue.
3. uplink signal-channel quality method of estimation in the tdd systems is characterized in that, may further comprise the steps:
The channel quality indicator (CQI) of base station receiving downlink from the terminal
DLWith Interference Estimation I
DL, said base station is through formula C
DL=CQI
DL* I
DLCalculate the channel estimating C of receiving downlink
DLThe Interference Estimation I of the up link at said terminal is estimated in said base station
UL
If satisfy predetermined condition, the channel estimating C of up link then
UL=C
DL, otherwise detectable signal is sent at said base station scheduling terminal, estimates C through measuring this detectable signal
UL, wherein said predetermined condition is C
DLPower and I
DLThe ratio of power greater than the first predetermined thresholding, perhaps C
DLPower and I
ULThe ratio of power less than predetermined second threshold.
4. the base station based on time division duplex is characterized in that, comprising:
The TDD sender is used for sending signal through down link to the terminal;
The TDD receiver is used for receiving the signal from said terminal from up link, comprising the channel estimating C of receiving downlink
DLWith Interference Estimation I
DL
The UL channel estimating unit is used for the channel estimating C according to the signal estimating uplink of said TDD receiver reception
UL
Send detectable signal SRS sending controling unit, be used for sending the said terminal of signaling scheduling and send detectable signal through said TDD sender;
Control unit is used to judge whether current channel estimating and Interference Estimation satisfy predetermined condition, if satisfy then with C
ULBe taken as and C
DLIdentical value is sent detectable signal otherwise indicate said SRS sending controling unit to dispatch said terminal, and the detectable signal of by said UL channel estimating unit said TDD receiver being received again estimates to obtain C
UL
The UL compensation unit is used for estimating according to the signal that said TDD receiver receives the Interference Estimation I of the up link at said terminal
UL
Said predetermined condition is:
C
DLPower and I
DLThe ratio of power greater than first thresholding, perhaps C
DLPower and I
ULThe ratio of power less than predetermined second threshold.
5. the base station based on time division duplex according to claim 4 is characterized in that, said UL compensation unit obtains I through the energy on the ascending resource piece of measuring this sub-district and not dispatching
ULValue.
6. the base station based on time division duplex is characterized in that, comprising:
The TDD sender is used for sending signal through down link to the terminal;
The TDD receiver is used for receiving the signal from said terminal from up link, comprising the channel quality indicator (CQI) of receiving downlink
DLWith Interference Estimation I
DL, and through formula C
DL=CQI
DL* I
DLCalculate the channel estimating C of receiving downlink
DL
The UL channel estimating unit is used for the channel estimating C according to the signal estimating uplink of said TDD receiver reception
UL
Send detectable signal SRS sending controling unit, be used for sending the said terminal of signaling scheduling and send detectable signal through said TDD sender;
Control unit is used to judge whether current channel estimating and Interference Estimation satisfy predetermined condition, if satisfy then with C
ULBe taken as and C
DLIdentical value is sent detectable signal otherwise indicate said SRS sending controling unit to dispatch said terminal, and the detectable signal of by said UL channel estimating unit said TDD receiver being received again estimates to obtain C
UL, wherein, said predetermined condition is C
DLPower and I
DLThe ratio of power greater than the first predetermined thresholding;
The UL compensation unit is used for estimating according to the signal that said TDD receiver receives the Interference Estimation I of the up link at said terminal
UL
Said predetermined condition is:
C
DLPower and I
DLThe ratio of power greater than first thresholding, perhaps C
DLPower and I
ULThe ratio of power less than predetermined second threshold.
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| WO2014161148A1 (en) * | 2013-04-02 | 2014-10-09 | Qualcomm Incorporated | Use of time auto-correlation for channel estimation |
| CN108282250B (en) * | 2017-01-06 | 2021-03-26 | 维沃移动通信有限公司 | Method for measuring downlink channel state information, base station and terminal |
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| CN101052148A (en) * | 2007-05-21 | 2007-10-10 | 中兴通讯股份有限公司 | High speed downward grouping cut-in method for base station and correcting method for channel quality instruction |
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| CN101154975A (en) * | 2006-09-30 | 2008-04-02 | 大唐移动通信设备有限公司 | Method and switching control device for obtaining channel condition information in TDD system |
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Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xin Xin finance leasing (Beijing) Co.,Ltd. Contract record no.: 2018990000163 Date of cancellation: 20210301 |
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Application publication date: 20091125 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xinxin Finance Leasing (Xiamen) Co.,Ltd. Contract record no.: X2021110000010 Denomination of invention: Uplink channel quality estimation method and base station in TDD system Granted publication date: 20120425 License type: Exclusive License Record date: 20210317 |
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