CN101588592A - Method for estimating uplink channel quality in time division duplex system - Google Patents
Method for estimating uplink channel quality in time division duplex system Download PDFInfo
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- CN101588592A CN101588592A CNA2008100433981A CN200810043398A CN101588592A CN 101588592 A CN101588592 A CN 101588592A CN A2008100433981 A CNA2008100433981 A CN A2008100433981A CN 200810043398 A CN200810043398 A CN 200810043398A CN 101588592 A CN101588592 A CN 101588592A
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Abstract
The invention relates to the wireless communication field, discloses a method for estimating uplink quality in a time division duplex system, can greatly decrease the cost for estimating the uplink quality and can 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 first threshold, uplink channel estimation CUL is equal to CDL, and 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 mobile communication system, this mode receiving and sending messages between base station and travelling carriage, it is form with the burst sequence, replace on same carrier frequency 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 easily by pilot tone etc.; In order to allow transmitting terminal utilize channel condition information, need receiving terminal channel information to be transmitted back to transmitting terminal timely and effectively by 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, terminal is carried out channel quality estimation to down link, obtains the channel quality indicator (CQI) of down link
DL, terminal is with CQI
DLReturn to the base station by up link, by the base station according to CQI
DLDetermine Modulation and Coding Scheme and user's scheduling of descending transmission data.In order the dispatching uplink user to send data in the bandwidth of broad, base station notice terminal sends detectable signal 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 terminal will send detectable signal 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 (as processor resource etc.) to be used for the processing to detectable signal.Because in the base station many terminals are arranged usually; if for the detectable signal of different terminals distributes mutual independent radio resources; then can take too much Radio Resource; so the time regular meeting a plurality of terminals send detectable signal on identical running time-frequency resource situation appears; this moment, these terminals meeting 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 base station is from the channel estimating C of terminal receiving downlink
DLWith Interference Estimation I
DL, or be equivalent to C
DLAnd I
DLInformation;
The Interference Estimation I of the up link of terminal is estimated in the base station
UL
If satisfy predetermined condition, the channel estimating C of up link then
UL=C
DL, otherwise the base station scheduling terminal sends detectable signal, estimates C by 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 by down link to 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 of 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 by 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 the TDD receiver being received by the UL channel estimating unit estimates to obtain C again
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, illustrate 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 by 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, illustrate 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 of terminal transmission detectable signal further, further reduced the cost that uplink signal-channel quality is estimated.Modern many communication systems are self-interferences, as based on code division multiple access (Code Division Multiple Access, abbreviation " CDMA ") system, 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, 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 the following description, in order to make the reader understand the application better many ins and outs have been proposed.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 purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
The execution mode of uplink signal-channel quality method of estimation as shown in Figure 1 in the TDD system.
In step 101, terminal detects according to received signal and estimates, obtains the channel estimating C of down link
DLWith Interference Estimation I
DL
After this enter step 102, terminal sends C
DLAnd I
DL, the base station receives C from up link
DLAnd I
DLExcept sending C
DLAnd I
DL, terminal also can send and C
DLAnd I
DLOut of Memory of equal value, 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 enter step 103, terminal is estimated the Interference Estimation I of the up link of terminal
ULIn an example, the base station obtains I by 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 of terminal obtains X ', just can estimate I from the difference of X ' and X
UL
After this enter step 104, the base station judges whether to satisfy predetermined condition, if satisfied predetermined condition then enter step 108, otherwise enters 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, illustrate 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 by 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, illustrate 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 of terminal transmission detectable signal further, further reduced the cost that uplink signal-channel quality is estimated.Modern many communication systems are self-interferences, when uplink interference is strong, communicate by letter just the busy period probably, the transmission that reduces 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 by emulation or to the statistics of historical data.
In step 105, the base station scheduling terminal sends detectable signal.Concrete way is that a specific signaling (or title " message ") is sent out to terminal in the base station, and terminal sends detectable signal according to this signaling.
After this enter step 106, the base station receives detectable signal.
After this enter step 107, the base station according to the detectable signal that is received to C
DLEstimate.After this enter 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 enter 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 enter step 110, the base station is according to CQI
ULDetermine the uplink modulation encoding scheme and carry out uplink scheduling for terminal, the base station is according to CQI
DLDecision down link Modulation and Coding Scheme also carries out descending scheduling for terminal.
Method execution mode of the present invention can be realized in 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, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") or the like.
The following describes in the TDD system based on the base station of TDD and the execution mode of terminal, wherein the structured flowchart of 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 by down link to 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 by 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 terminal is carried out uplink scheduling 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 terminal is carried out descending scheduling 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 of base station and terminal among the present invention and sending and receiving letter machine all are logical blocks, 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 and DL compensation unit 214 can realize in same physical location in the terminal execution mode; 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 not too close unit with solving 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; Terminal in the terminal execution mode can also have display screen, microphone, earphone, keyboard or the like.
The related equipment of present embodiment can be used for the flow process that the Method Of Accomplishment execution mode is mentioned.Therefore all ins and outs of mentioning in the method execution mode are still effective in the present embodiment, in order to reduce repetition, repeat no more here.
Though by 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 the form and details, and without departing from the spirit and scope of the present invention.
Claims (7)
1. uplink signal-channel quality method of estimation in the tdd systems is characterized in that, may further comprise the steps:
The base station is from the channel estimating C of terminal receiving downlink
DLWith Interference Estimation I
DL, or be equivalent to C
DLAnd I
DLInformation;
If satisfy predetermined condition, the channel estimating C of up link then
UL=C
DL, otherwise described base station scheduling terminal sends detectable signal, estimates C by measuring this detectable signal
UL, wherein said predetermined condition is C
DLPower and I
DLThe ratio of power greater than the first predetermined thresholding.
2. uplink signal-channel quality method of estimation in the tdd systems according to claim 1 is characterized in that, and is before judging whether to satisfy described predetermined condition, further comprising the steps of:
The Interference Estimation I of the up link of described terminal is estimated in described base station
UL
Described 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.
3. uplink signal-channel quality method of estimation in the tdd systems according to claim 2 is characterized in that the Interference Estimation I of the up link of described terminal is estimated in described base station
ULStep in,
Described base station obtains I by the energy on the ascending resource piece of measuring this sub-district and not dispatching
ULValue.
4. uplink signal-channel quality method of estimation in the tdd systems according to claim 3 is characterized in that, the described C that is equivalent to
DLAnd I
DLInformation be the channel quality indicator (CQI) of down link
DLAnd I
DL, described base station is by formula C
DL=CQI
DL* I
DLCalculate C
DL
5. the base station based on time division duplex is characterized in that, comprising:
The TDD sender is used for sending signal by down link to terminal;
The TDD receiver is used for from the signal of up link reception from described terminal, comprising the channel estimating C of receiving downlink
DLWith Interference Estimation I
DL, or be equivalent to C
DLAnd I
DLInformation;
The UL channel estimating unit is used for the channel estimating C according to the signal estimating uplink of described TDD receiver reception
UL
The SRS sending controling unit is used for sending the described terminal of signaling scheduling by described 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 sends detectable signal otherwise indicate described SRS sending controling unit to dispatch described terminal, and the detectable signal of described TDD receiver being received by described UL channel estimating unit estimates to obtain C again
UL, wherein, described predetermined condition is C
DLPower and I
DLThe ratio of power greater than the first predetermined thresholding.
6. the base station based on time division duplex according to claim 5 is characterized in that,
Also comprise the UL compensation unit, be used for estimating the Interference Estimation I of the up link of described terminal according to the signal that described TDD receiver receives
UL
Described 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.
7. the base station based on time division duplex according to claim 6 is characterized in that, described UL compensation unit obtains I by the energy on the ascending resource piece of measuring this sub-district and not dispatching
ULValue.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100433981A CN101588592B (en) | 2008-05-22 | 2008-05-22 | Uplink Channel Quality Estimation Method and Base Station in Time Division Duplex System |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100433981A CN101588592B (en) | 2008-05-22 | 2008-05-22 | Uplink Channel Quality Estimation Method and Base Station in Time Division Duplex System |
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| CN101588592A true CN101588592A (en) | 2009-11-25 |
| CN101588592B CN101588592B (en) | 2012-04-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014161148A1 (en) * | 2013-04-02 | 2014-10-09 | Qualcomm Incorporated | Use of time auto-correlation for channel estimation |
| CN108282250A (en) * | 2017-01-06 | 2018-07-13 | 维沃移动通信有限公司 | A kind of measurement method of downlink channel condition information, base station and terminal |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101154975B (en) * | 2006-09-30 | 2012-10-10 | 电信科学技术研究院 | Method for obtaining channel state information in TDD system |
| CN100512553C (en) * | 2007-05-21 | 2009-07-08 | 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 |
-
2008
- 2008-05-22 CN CN2008100433981A patent/CN101588592B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014161148A1 (en) * | 2013-04-02 | 2014-10-09 | Qualcomm Incorporated | Use of time auto-correlation for channel estimation |
| CN108282250A (en) * | 2017-01-06 | 2018-07-13 | 维沃移动通信有限公司 | A kind of measurement method of downlink channel condition information, base station and terminal |
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| Publication number | Publication date |
|---|---|
| CN101588592B (en) | 2012-04-25 |
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