CN1798443B - Method for solving error rate of physical channel - Google Patents
Method for solving error rate of physical channel Download PDFInfo
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- CN1798443B CN1798443B CN 200410104107 CN200410104107A CN1798443B CN 1798443 B CN1798443 B CN 1798443B CN 200410104107 CN200410104107 CN 200410104107 CN 200410104107 A CN200410104107 A CN 200410104107A CN 1798443 B CN1798443 B CN 1798443B
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Abstract
The method includes following steps: gets the physical channel error rate by using transmission format combination indicator (TFCI); the base station makes hard decision for the data of TFCI, and meanwhile decodes the data of TFCI, and then makes anti code for the decoded data; in term of the hard decision result and the anti code result, gets the physical channel error rate. The invention also discloses another method for getting the physical channel error rate. It includes: gets the physical channel error rate by using data of pilot frequency domain; the base station makes hard decision forthe data of pilot frequency domain; in term of the data of pilot frequency domain corresponding to the time slot format sent down by radio network controller and the hard decision result, gets the physical channel error rate.
Description
Technical field
The present invention relates to the Channel Technology of radio communication, be specifically related to a kind of acquiring method of error rate of physical channel.
Background technology
Along with development of wireless communication devices, the Channel Transmission performance obtains people's attention day by day, and the error code that occurs in the Channel Transmission process can influence communication quality, will cause communication normally to carry out when error code is serious.Therefore, as the important indicator of weighing the Channel Transmission performance, the error rate (BER) also just has been subjected to attention.
In all wireless channel BER, the BER of physical channel is even more important.Because radio network controller (RNC) will carry out the power control of radio communication according to the physical channel BER that obtains from base station node B, adjust up signal to noise ratio; In addition, when handling soft handover, RNC need select several relatively low Radio Links of BER in multi wireless links, and the data of several Radio Links of selection are merged its follow-up operating in soft handover of Xingqi of going forward side by side.
When subscriber equipment (UE) by physical channel when Node B sends the primary signal of UE self, primary signal can be subjected to the influence of physical channel state in transmission course, as: the noise signal in the physical channel can be mixed in the primary signal, or the signal attenuation during Channel Transmission causes some bit drop-out in the primary signal etc.; Certainly, the UE transmitting power is crossed to hang down and also can be caused signal attenuation, and then causes some bit drop-out in the primary signal.
The signal receiver of Node B side carries out demodulation to this signal after receiving the signal that transmits via physical channel.At this moment, at the signal of finishing demodulation and UE in each same number of frames structure of the primary signal that Node B sends, different with regard to the Bit data that has some because of error code, divided by total bit number that signal comprised that Node B receives, just obtained physical channel BER with these bit numbers inequality from UE.
Yet, in practical operation, because Node B can't predict UE all primary signals to its transmission fully, so, usually adopt some specific formula to come Computational Physics channel BER at present, the channel property parameter such as signal to noise ratio, bandwidth, message transmission rate that generally comprises physical channel in the formula, and the receiver performance parameters such as reception precision of Node B side signal receiver also might comprise the demodulating equipment performance parameters such as demodulating error of Node B side demodulating equipment.
But, actual physical Channel Transmission performance can change along with the difference of communication environment, so, use the physical channel BER that above-mentioned specific formulation is calculated, will there be a certain distance with actual physics channel BER, causes accuracy and the reliability of the physical channel BER that asks for to decrease; In addition, the reduction of physical channel BER accuracy and reliability, also will make RNC and other Radio Network System produce mistake according to corresponding judgement and the operation that physical channel BER carries out, thereby reduced the reliability of RNC and other network system, had a strong impact on the operate as normal of RNC and other network system.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of acquiring method of error rate of physical channel, the accuracy and the reliability of the error rate of physical channel of trying to achieve with raising.
Achieve the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of acquiring method of error rate of physical channel, this method may further comprise the steps:
A. the base station is indicated the transformat combination in the Dedicated Physical Control Channel data of receiving and is carried out hard decision; And the base station is indicated the transformat combination in the Dedicated Physical Control Channel data of receiving and is deciphered, again to the decode results Gray code;
B. the base station obtains error rate of physical channel according to hard decision result among the step a and Gray code result.
Among the step b, the method that described base station obtains error rate of physical channel is:
Hard decision result and described Gray code result described in the same number of frames structure of Dedicated Physical Control Channel obtain the errored bit number in the more specific transmission time of base station; And with the total bit number of this errored bit number divided by the transformat combination in the same number of frames structure of Dedicated Physical Control Channel in specific transmission time indication, will remove ratio value as error rate of physical channel.
Among the step b, the method that described base station obtains error rate of physical channel is:
Hard decision result and described Gray code result described in the same number of frames structure of Dedicated Physical Control Channel obtain the errored bit number in the more specific transmission time of base station; And with the total bit number of this errored bit number divided by the transformat combination in the same number of frames structure of Dedicated Physical Control Channel in specific transmission time indication, will remove again ratio value be quantified as error rate grade, with this error rate grade as error rate of physical channel.
The described specific transmission time is a Transmission Time Interval.
Compared with prior art, the present invention can use different modes, asks for error rate of physical channel flexibly, easily.
When error rate of physical channel was asked in the indication of application transport format combination, hard decision was carried out to the transmission format combination indicating data of receiving in the base station; Simultaneously, the transmission format combination indicating data of receiving is deciphered, again to the decode results Gray code; By more above-mentioned hard decision result and Gray code result, obtain error rate of physical channel, make the accuracy of the error rate of physical channel of trying to achieve and reliability obtain to a certain degree raising.
Description of drawings
Fig. 1 asks for flow chart for the error rate of physical channel of a preferred embodiment of the present invention;
Fig. 2 asks for flow chart for the error rate of physical channel of another preferred embodiment of the present invention.
Embodiment
At present, chnnel coding successfully is applied in the various communication systems, and also obtains increasingly extensive application in computer, magnetic recording and various memory, and chnnel coding claims error control coding again.The basic implementation method of error control coding is when transmitting terminal carries out framing, and the information code element that is transmitted is enclosed some redundant supervise code elements, between these supervise code elements and the information code element with certain determine regular interrelated.Receiving terminal according to set rule by the relation between decoded operation check information code element and the supervise code element, in case mistake takes place in transmission, then the relation of information code element and supervise code element just is damaged, thereby receiving terminal can be found mistake and even correct a mistake according to the described incidence relation between information code element and the supervise code element.
The present invention uses above-mentioned channel volume, decoding technique just, to ask for error rate of physical channel.In general, can utilize transformat combination indication (TFCI) territory or pilot tone (Pilot) territory of DPCCH to carry out asking for of physical channel BER.
When error rate of physical channel was asked in the indication of application transport format combination, hard decision was carried out to the transmission format combination indicating data of receiving in the base station; Simultaneously, the transmission format combination indicating data of receiving is deciphered, again to the decode results Gray code; By more above-mentioned hard decision result and Gray code result, obtain error rate of physical channel.
When the using pilot numeric field data is asked for error rate of physical channel, the pilot field data hard decision of base station to receiving; And, obtain error rate of physical channel by comparing pairing pilot field data of time slot format and the hard decision result that radio network controller issues.
Below, reach specific embodiment in conjunction with the accompanying drawings the inventive method is described in detail.
At first, earlier fors an embodiment, the method that physical channel BER asks for is carried out in application TFCI territory be described.
Embodiment one:
Referring to Fig. 1, Fig. 1 asks for flow chart for the error rate of physical channel of a preferred embodiment of the present invention, and this flow process may further comprise the steps:
Before the step 101:UE emission DPCCH data, at first to finish the framing of emission data.At this moment, UE encodes to the TFCI data, makes its bit number become 32 bits.Certainly, if TFCI bit number less than 10 bits, will earlier the TFCI bit number be supplied 10 bits after, encode again.
TFCI is the parameter that is used for defining Dedicated Physical Data Channel (DPDCH) Frame data transmission format, general string representation with one 10 bit, when the Node B as receiving terminal receives behind the Frame of UE, Node B will therefrom obtain TFCI, to know the transformat of data in the corresponding DPDCH Frame.
Step 102: 32 Bit datas that TFCI comprised that will finish coding are mapped to respectively in each frame structure of DPCCH.Particularly, the TFCI that will finish coding exactly is mapped to respectively in the TFCI territory of all time slots that each Frame of DPCCH comprises, and makes in the TFCI territory of each time slot that each frame structure comprises all to comprise the TFCI data that have certain bit number and finish coding.Above-mentioned map operation is a prior art, so do not give unnecessary details at this.
Certainly, after finishing mapping, TFCI bit number in the TFCI territory of presumable time slot is less than the TFCI bit number in other time slot TFCI territory, at this moment the TFCI bit number in the less relatively TFCI territory can be supplied, and makes the TFCI bit number in the TFCI territory of each time slot of DPCCH all identical.Afterwards, 0 in the Bit data of DPCCH is transformed to-1,1 be transformed to+1.
Through behind the aforesaid operations, just finished the framing that UE is transmitted.
Step 103:UE will finish the DPCCH data of framing through the laggard row emission of ovennodulation.
Step 104:Node B receives from the DPCCH of UE data, and with this data demodulates.
Step 105:Node B carries out hard decision to the TFCI numeric field data in the DPCCH data of finishing demodulation, that is: be 0 with TFCI territory intermediate value more than or equal to 0 data decision, is 1 with value less than 0 data decision.
Simultaneously, Node B deciphers the TFCI numeric field data in the DPCCH data of finishing demodulation.
Because decoded operation has certain error correcting capability, thus can think the TFCI numeric field data of finishing decoding, identical with the TFCI numeric field data of UE in the step 103 in the DPCCH data that Node B sends.Like this, just can be with the TFCI numeric field data of finishing decoding as the initial data of asking for the DPCCH error rate, and hard decision gained data in this initial data and the step 105 are compared, to obtain the DPCCH error rate.
But, owing to the TFCI numeric field data of finishing decoding in the Frame is 10 bits, be not inconsistent with the data format of deciphering 32 preceding bits, so also to use with step 101 in identical coding method the TFCI numeric field data of finishing decoding is encoded once more, that is: Gray code is so that the TFCI numeric field data form in the Frame before the TFCI numeric field data form in the Frame behind the Gray code and the decoding conforms to.
Step 106: will finish the TFCI numeric field data of Gray code in each Frame, respectively with its data frame in finish hard decision in the same number of frames structure the TFCI numeric field data compare, if it is identical with the TFCI numeric field data of finishing hard decision to finish the TFCI numeric field data of Gray code in the same number of frames structure, represent that then wireless transmission is errorless; Otherwise, just error has appearred in the expression transmission, the TFCI errored bit number that occurs transmission error in all Frames in the Transmission Time Interval (TTI) is added up, also the TFCI numeric field data in all Frames in this TTI is added up simultaneously, again with the above-mentioned TFCI errored bit number that adds up finished divided by the above-mentioned total bit number of TFCI numeric field data that adds up of finishing.After finishing above-mentioned division arithmetic, will obtain a ratio value.
Step 107: the ratio value that obtains is quantized, that is: different ratio value scopes are set to different DPCCH error rate grades, and which error rate grade ratio value that obtains in the determining step 106 belongs to.
Through aforesaid operations, just obtained the error rate of DPCCH; Certainly, also can be directly with the aforementioned proportion value that obtains the error rate as DPCCH.
Because the error rate of DPCCH has embodied the transmission quality of physical channel, so can be with the error rate of above-mentioned DPCCH as physical channel BER.
As seen, present embodiment be with TFCI among the DPCCH as measurement data, to ask for physical channel BER, the physical channel BER that is asked for as measurement data with TFCI has higher accuracy.
Below, again for an embodiment, carry out the method that physical channel BER asks for and be described using the Pilot territory.
Embodiment two:
Among the embodiment one, though when asking for physical channel BER with TFCI as measurement data, the TFCI numeric field data is encoded in the UE side, decipher in Node B side again, error correcting capability by this volume, decoded operation makes the physical channel BER that asks for have higher accuracy.But it is identical that above-mentioned error correcting capability can not make Node B side finish the TFCI numeric field data that the TFCI numeric field data of decoding and UE side send, and also there are certain error correction error in present after all volume, decoding technique.So, think the TFCI numeric field data of finishing decoding, identical with UE to the TFCI numeric field data that Node B sends, and then the initial data of the DPCCH error rate is asked in the TFCI numeric field data conduct that will finish decoding, and hard decision gained data in the step 105 of this initial data and present embodiment are compared the physical channel BER that is obtained, though certain accuracy is arranged, accuracy still is not very high.
Compare with the TFCI among the embodiment one, the Pilot numeric field data among the DPCCH has stability preferably.Because after UE and Node B set up Radio Link, the Pilot numeric field data among the DPCCH had just immobilized.Simultaneously, RNC can issue the time slot format of identical current wireless link to UE and Node B.
After above-mentioned time slot format was determined, with the unique corresponding Pilot sequence of this time slot format, that is: the Pilot numeric field data had also just been determined.So, the pairing Pilot numeric field data of the time slot format that Node B receives is identical with Pilot numeric field data among the DPCCH of UE emission.Therefore, the above-mentioned Pilot numeric field data that Node B can be known is as the initial data of asking for physical channel BER.
Use method that the Pilot numeric field data asks for physical channel BER as shown in Figure 2, Fig. 2 asks for flow chart for the error rate of physical channel of another preferred embodiment of the present invention, and this flow process may further comprise the steps:
Step 201:Node B receives from the DPCCH of UE data, and with this data demodulates.
Step 202:Node B carries out hard decision to the Pilot numeric field data in the DPCCH data of finishing demodulation, that is: be 0 with Pilot territory intermediate value more than or equal to 0 data decision, is 1 with value less than 0 data decision.
Step 203:Node B will finish the Pilot numeric field data of hard decision in each Frame, the pairing Pilot numeric field data of time slot format that issues with RNC compares respectively, if identical, represents that then wireless transmission is errorless; Otherwise, just error has appearred in the expression transmission, and the Pilot errored bit number that occurs transmission error in all Frames in the TTI added up, also the Pilot numeric field data in all Frames in this TTI is added up simultaneously, again with the above-mentioned Pilot errored bit number that adds up finished divided by the above-mentioned total bit number of Pilot numeric field data that adds up of finishing.After finishing above-mentioned division arithmetic, will obtain a ratio value.
Step 204: the ratio value that obtains is quantized, that is: different ratio value scopes are set to different DPCCH error rate grades, and which error rate grade ratio value that obtains in the determining step 203 belongs to.
Through aforesaid operations, just obtained the error rate of DPCCH; Certainly, also can be directly with the aforementioned proportion value that obtains the error rate as DPCCH.
Because the error rate of DPCCH has embodied the transmission quality of physical channel, so can be with the error rate of above-mentioned DPCCH as physical channel BER.
As seen, use the physical channel BER that the Pilot numeric field data among the DPCCH is tried to achieve, the physical channel BER that tries to achieve than application TFCI numeric field data is more accurate, more reliable.Simultaneously, Pilot numeric field data in the same number of frames structure bit number than TFCI numeric field data and other numeric field data usually is many, so can think and use the physical channel BER that the Pilot territory multi-bit certificate among the DPCCH is tried to achieve, the physical channel BER that tries to achieve with application TFCI numeric field data and other numeric field data compares, and has higher relatively accuracy, reliability.
By the above as can be seen, the different acquiring methods of error rate of physical channel provided by the present invention make the accuracy of the error rate of physical channel of trying to achieve and reliability obtain in various degree raising.The above only is process of the present invention and method embodiment, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the acquiring method of an error rate of physical channel is characterized in that, this method may further comprise the steps:
A. hard decision is carried out to the combination of the transmission in the Dedicated Physical Control Channel data of receiving indication in the base station; And decipher the combination of the transmission in the Dedicated Physical Control Channel data of receiving indication the base station, again to the decode results Gray code;
B. the base station obtains error rate of physical channel according to hard decision result among the step a and Gray code result.
2. the method for claim 1 is characterized in that, among the step b, the method that described base station obtains error rate of physical channel is:
Hard decision result and described Gray code result described in the same number of frames structure of Dedicated Physical Control Channel obtain the errored bit number in the more specific transmission time of base station; And with the total bit number of this errored bit number divided by the transformat combination in the same number of frames structure of Dedicated Physical Control Channel in specific transmission time indication, will remove ratio value as error rate of physical channel.
3. the method for claim 1 is characterized in that, among the step b, the method that described base station obtains error rate of physical channel is:
Hard decision result and described Gray code result described in the same number of frames structure of Dedicated Physical Control Channel obtain the errored bit number in the more specific transmission time of base station; And with the total bit number of this errored bit number divided by the transformat combination in the same number of frames structure of Dedicated Physical Control Channel in specific transmission time indication, will remove again ratio value be quantified as error rate grade, with this error rate grade as error rate of physical channel.
4. as claim 2 or 3 described methods, it is characterized in that the described specific transmission time is a Transmission Time Interval.
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| CN 200410104107 CN1798443B (en) | 2004-12-29 | 2004-12-29 | Method for solving error rate of physical channel |
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| CN 200410104107 CN1798443B (en) | 2004-12-29 | 2004-12-29 | Method for solving error rate of physical channel |
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| CN1798443A CN1798443A (en) | 2006-07-05 |
| CN1798443B true CN1798443B (en) | 2010-04-28 |
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| CN 200410104107 Expired - Fee Related CN1798443B (en) | 2004-12-29 | 2004-12-29 | Method for solving error rate of physical channel |
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| CN102404037B (en) * | 2010-09-15 | 2014-06-18 | 上海贝尔股份有限公司 | Method and device for reducing return expense of soft combination in uplink multi-base station Multiple Input Multiple Output (MIMO) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6070086A (en) * | 1996-09-20 | 2000-05-30 | Nec Corporation | Closed loop power transmitter power control unit for a CDMA cellular system |
| CN1324521A (en) * | 1998-10-20 | 2001-11-28 | 交互数字技术公司 | Cancellation of pilot and unwanted traffic signals in a CDMA system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6070086A (en) * | 1996-09-20 | 2000-05-30 | Nec Corporation | Closed loop power transmitter power control unit for a CDMA cellular system |
| CN1324521A (en) * | 1998-10-20 | 2001-11-28 | 交互数字技术公司 | Cancellation of pilot and unwanted traffic signals in a CDMA system |
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