CN1921333B - Power control method for physical channel transmitting binary reduplicate information bit - Google Patents
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Abstract
The invention relates to a power control of physical signal channel for transmitting binary repeated information bit in mobile communication system. Wherein, it can convert the error probability of said physical signal channel into respected error bit rate, to realize closed-loop control on the signal channel. The invention uses external loop to control respected error rate, to reduce the disturbance on other signal channel and make the receiver receive binary information accurately.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of Poewr control method that transmits the physical channel of binary interactive channel bit, particularly relevant for the Poewr control method of the HS-SICH channel (ascending control channel) of HSDPA system.
Background technology
In existing communication system,, generally can adopt power control techniques that every in system physical channel is carried out power control in order to guarantee the quality of institute's transmission communication signal in the channel.Power control needs to guarantee that receiving terminal can carry out correct demodulation with received signal on the one hand, also need reduce the interference to other physical channel on the other hand as far as possible, makes system obtain sufficiently high capacity.
Power control mainly comprises closed power control and exterior ring power control.At receiving terminal the useful signal that is received is carried out snr measurement, the expectation target signal to noise ratio of system configuration and the signal to noise ratio of measurement compare, produce the command word of rise or following adjusting power and be sent to transmitting terminal by backward channel, the power of the signal that transmitting terminal correspondingly will send according to this step-length adjustment after receiving power control command word next time, this power control techniques are referred to as closed power control.Under many circumstances, the purpose of power control is not in order to keep target signal to noise ratio in certain scope, but maintains in certain scope for the quality that makes received signal.It is this by the measurement of the quality of reception is referred to as exterior ring power control to the power control techniques that target signal to noise ratio is revised.Exterior ring power control and closed power control are widely used in the code division multiple address communication system.
When receiving terminal utilized physical channel transmission non-" 0 " promptly the binary information bit of " 1 " is to transmitting terminal, this physical channel was generally launched with the transmitting power of fixing.And, in wireless communications environment,, adopt the mode that the binary information that sends is repeated to send usually in order to improve this reliability of information transmission of directly on physical channel, transmitting with binary value implication.When the fixing transmitting power of physical channel employing of transmission binary reduplicate information bit, launch with the maximum transmission power that this channel allows such as transmitting terminal, then give the bigger interference of other physical channel.
Tenability to the high-speed mobile Packet data service is one of 3G system most important character.The data rate that WCDMA R99 version can provide peak rate to reach 2Mbps, this speed is enough substantially for the existing Packet Service of major part.Yet, to flow and data service such as video, Streaming Media and the download etc. of delaying having relatively high expectations, need system that higher transmission rate and shorter time delay are provided for many.
For this reason, the HSDPA technology is that 3GPP is organized in a kind of technology of introducing in the R5 version.HSDPA not only supports the asymmetric data, services of high speed, and operator's input cost is minimized.It is UMTS (Universal Mobile Telecommunications System: Universal MobileTelecommunications System) more high data rate and more high power capacity an evolution approach stably is provided.The HSDPA technology of R5 version abundant design philosophy and experience with reference to CDMA20001X EV-DO, increase a high speed shared data channel (HS-DSCH) newly, HS-DSCH makes through-put power, channel resource etc. can unify to utilize, and according to user's actual conditions dynamic assignment, thereby improved resource utilization.And the HSDPA communication system has also been introduced HS-SCCH channel (down control channel) and HS-SICH channel (ascending control channel).Network side adopts the HS-DSCH channel before user terminal sends grouped data, and mainly a HS-SCCH channel by wherein sends corresponding control information to user terminal.The HS-SICH channel is positioned at up link, is used to transmit necessary control information, mainly is the feedback information with downlink quality of replying to transmission grouping, the HS-SICH Channel Transmission all be information with binary value implication.
At present, in order to guarantee the quality of the signal of communication of HS-DSCH Channel Transmission in the HSDPA system, generally adopt and increase the CRC check sign indicating number at transmitting terminal, at receiving terminal by transmission correctness to CRC check result's judgement specified data piece, but, adopt CRC check to judge whether the transmission block mistake comes to determine that the measurement of HS-SICH quality of channel is inapplicable because the HS-SICH channel is a kind of physical channel that transmits binary interactive channel bit.The HS-SICH channel can adopt open Loop Power control, and its transmitting power is with reference to the up DPCH channel power of following.But, because up DPCH channel is different in coded system with the HS-SICH channel, so it is inaccurate weighing the HS-SICH channel power with the power of up DPCH channel.The HS-SICH channel also can adopt fixing transmitting power, launches with the maximum transmission power that this channel allows such as transmitting terminal, then gives the bigger interference of other physical channel.
That is, control lacks effective control device and reduces interference to other physical channel to the power of HS-SICH channel in the prior art.
Summary of the invention
The object of the present invention is to provide a kind of Poewr control method of physical channel that is applicable to the transmission binary reduplicate information bit, this physical channel is lacked effective power control device the problem disturbed in the reduction system to solve in the prior art.
For addressing the above problem, the invention discloses a kind of Poewr control method that transmits the physical channel of binary reduplicate information bit, it is characterized in that, comprise: the bit error rate that obtains expectation according to the probability of miscarriage of justice of the described physical channel of system requirements, if the bit error rate BER of actual measurement is greater than the bit error rate of expectation, then raise the transmitted power of transmitting terminal, otherwise, then reduce the transmitted power of transmitting terminal.
The bit error rate that obtains expectation according to the probability of miscarriage of justice of the described physical channel of system requirements comprises: utilize inequality
The minimum value that calculates p is the bit error rate of expectation, wherein, and p
eBe the probability of miscarriage of justice of the described physical channel of system requirements, described N is the number of times of each bit repeated encoding, and M can be that system preestablishes maximum error bit number.
The bit error rate that obtains expectation according to the probability of miscarriage of justice of the described physical channel of system requirements comprises:
A1: receiving terminal receives binary reduplicate information bit, adds up in the repeated encoding of mutually same bit 0 and 1 number, therefrom selects the number that wherein number is few to count J as error bit;
A2: calculate bit error probability p
m, p
m=J/N, wherein J is for measuring the error bit number of repeated encoding, and N is the number of times of this bit repeated encoding;
A3: according to
Calculate the block error rate BLER of current t bit, wherein, p
mBe the bit error probability that step a2 calculates, N is the repeated encoding number of times of current t bit, and M can be that system preestablishes maximum error bit number;
A4: calculate the block error rate BLER of several bits, obtain the average Block Error Rate of those bits;
A5: if average BLER is greater than the p of system requirements
e, then reduce expectation bit error rate value, otherwise improve expectation bit error rate value.
Each step-length that reduces or improve expectation bit error rate value is 1/N among the step a5, and N is the repeated encoding number of times of a bit.
The bit error rate BER of actual measurement obtains in the following manner:
B1: receiving terminal receives binary reduplicate information bit, adds up in the repeated encoding of mutually same bit 0 and 1 number, therefrom selects the number that wherein number is few to count J as error bit;
B2: calculate bit error probability p
m, p
m=J/N, wherein J is for measuring the error bit number of repeated encoding, and N is the number of times of this bit repeated encoding;
B3: according to bit error probability p
mCalculate the BER measured value.
Step b3 is by smooth manner BER (x)=λ p
m(x-1)+(1-λ) p
m(x) obtain BER, wherein, λ is a smoothing factor, p
m(x) error probability of measuring for this bit, p
m(x-1) be the error probability that last bit is measured.The bit error probability p that the BER measured value obtains for step b2 among the step b3
m
Described physical message is the ascending control channel in the HSDPA system, and the backward channel that is used to transmit control is a down control channel.
Compared with prior art, the present invention has the following advantages: the present invention proposes a kind of power control that can be widely used in the mobile communication system the physical channel of transmission binary reduplicate information bit, the probability of miscarriage of justice of the described physical channel of system requirements is converted to the bit error rate of expectation, and then, finish closed-loop control to physical channel with this with the bit error rate of measured bit error rate and expectation.The present invention also adopts the bit error rate of outer shroud control expectation, can not only reduce the interference to other channel, and can make receiving terminal accurately receive those binary bits information.
Description of drawings
Fig. 1 is the flow chart that described physical channel is carried out the method for closed power control;
Fig. 2 is that the present invention utilizes the exterior ring power control technology to come physical channel is carried out the method for power control.
Embodiment
Below in conjunction with accompanying drawing, specify the present invention.
The present invention obtains the bit error rate of expectation according to the probability of miscarriage of justice of the described physical channel of system requirements, if the bit error rate BER of actual measurement greater than the bit error rate of expectation, then raises the transmitted power of transmitting terminal, otherwise, then reduce the transmitted power of transmitting terminal.And the present invention makes the physical channel of transmission binary reduplicate information bit have preferable power control also by the bit error rate of exterior ring power control expectation.
Below with regard to two implementations power of the present invention control is described: utilize the closed power control technology to come physical channel is carried out power control, and utilize closed power control technology and exterior ring power control technology to come physical channel is carried out power control.
See also Fig. 1, it is the flow chart that described physical channel is carried out the method for closed power control.It comprises:
S110: calculation expectation bit error rate
If physical channel need send L binary bits information, in order to improve binary bits transmission of Information accuracy, transmitting terminal can repeat this L binary bits information to send (is N such as number of repetition) usually, and then receiving terminal receives those binary bits information.For same bit, add up the number that single code element is judged as " 0 " and " 1 " in the N that the receives repeated encoding earlier, get the many binary codings (1 or 0) of number and be the court verdict of this bit information.Receiving terminal need carry out L time to the binary repetition bits information that receives to be differentiated, and could obtain the information of this L binary bits successively.The coded system that transmitting terminal and receiving terminal can be made an appointment and be adopted obtains the number of each bit repeated encoding in advance.Also can be that transmitting terminal is also notified described receiving terminal by certain signaling method with coded system and each bit repeated encoding number at every turn when transmitting the binary duplicate message.Such as, the 3rd bit is " 0 " in L the binary bits information that transmitting terminal sends, the number of each bit repeated encoding is 20 times in this transmission.Receiving terminal receives those bits and their repeated encoding, receiving terminal is added up the number of " 0 " bit and " 1 " bit in all repeated encodings of this bit, wherein the bit that number is many is promptly thought the bit value of the 3rd bit, in the code element information that repeats to send for 20 times, as long as the code element number that is mistaken for " 1 " is less than 10, receiving terminal can be " 0 " with this bit decision correctly just, if and the code element number that is mistaken for " 1 " surpasses 10, receiving terminal will cause mistake in judgment for " 1 " with this bit decision.
A1: suppose that each bit number of repetition is N, the probability of each bit transfer mistake is p, and the probability calculation formula of then wrong k bit is:
A2: the probability that total error bit number surpasses M is:
Wherein, M can be that system preestablishes maximum error bit number;
A3: total error bit number surpasses the probability E of M
MThe probability of miscarriage of justice that can not exceed the physical channel of system requirements, promptly
E
M≤ p
eFormula 3
Promptly according to formula 1 to formula 3, obtain inequality
The minimum value that calculates p is the expectation bit error rate of requirement, and described N is the number of times of each bit repeated encoding.
If bit number repeats to send behind N coding, if error coded surpasses [N/2], then mistake in judgment will appear in receiving terminal, cause binary information to receive thus and make mistakes, thereby the accuracy that causes receiving data be very low, and wherein symbol [] is represented rounding operation.That is to say, preestablish total error bit and count M that certainly M also can set according to concrete system requirements at least more than or equal to [N/2], such as M greater than [N/3].
When M gets [N/2], at the probability of miscarriage of justice p of the transmission binary reduplicate information bit of different system requirements
e, can obtain corresponding expectation bit error rate p
t
When following table 1 has provided N=36 and N=16, different probability of miscarriage of justice p
eUnder expectation bit error rate p
tValue.
| N | ?p e | ?p t |
| 36 | ?1e-3 | ?0.249 |
| ?1e-4 | ?0.208 | |
| ?1e-5 | ?0.177 | |
| ?1e-6 | ?0.151 | |
| ?1e-9 | ?0.097 |
| N | ?p e | ?p t |
| 16 | ?1e-3 | ?0.149 |
| ?1e-4 | ?0.107 | |
| ?1e-5 | ?0.078 | |
| ?1e-6 | ?0.057 | |
| ?1e-9 | ?0.023 |
Here the system that it is pointed out that provides the probability of miscarriage of justice p of native system requirement in advance
e, also can be the technical staff probability of miscarriage of justice p of predetermined system requirement as the case may be
e
Step S120: actual measurement bit error rate BER
B1: receiving terminal receives binary reduplicate information bit, adds up the number of " 0 " and " 1 " in the repeated encoding of mutually same bit, therefrom selects the number that wherein number is few to count J as error bit.
J=min (N
0, N
1) formula 4
Wherein, N
0Be the number of " 0 " bit in this bit repeated encoding, N
1Number for " 1 " bit in this bit repeated encoding.
B2: calculate bit error probability p
m, p
m=J/N, wherein J is for measuring the error bit number of repeated encoding, and N is the number of times of this bit repeated encoding;
B3: according to bit error probability p
mCalculate the BER measured value
The BER measured value can equal bit error probability p
m, still
Because the randomness of bit mistake can adopt forgetting factor to p
mCarry out smoothly obtaining the BER measured value:
BER (x)=λ p
m(x-1)+(1-λ) p
m(x) ,-p
m(x) the bit error probability of the x time measurement of expression, p
m(x-1) result of the x-1 time (once preceding) measurement of expression.The span of forgetting factor is (0,1), representative value 1/2.
Step S130 is if the BER measured value is greater than expectation bit error rate p
t, then produce the command word of last adjusting power and be sent to transmitting terminal, otherwise produce the command word of following adjusting power and be sent to transmitting terminal by backward channel by backward channel.The power of the signal that transmitting terminal correspondingly will send according to this step-length adjustment after receiving power control command word next time.
Such as:
ifBER＞p
t
TPC＝1
else
TPC＝0
Wherein, TPC is a power control command word, and 0 expression is adjusting power down, and adjusting power is gone up in 1 expression.
The probability of miscarriage of justice of said method by the binary repeated encoding of system requires to be converted into the requirement to bit error rate, provide the foundation of closed power control with this, this mode needing in the mobile communication system can be widely used in the physical channel to the transmission binary reduplicate information bit to carry out the occasion that closed power is controlled.
Because factors such as channel fading and TPC time delay, may influence the bit Fault Distribution, the present invention also increases exterior ring power and controls the bit error rate of adjusting expectation for this reason, sees also Fig. 2, and it comes physical channel is carried out the method for power control for the present invention utilizes the exterior ring power control technology.
Step S210: receiving terminal receives binary reduplicate information bit, adds up the number of " 0 " and " 1 " in the repeated encoding of mutually same bit, therefrom selects the number that wherein number is few to count J as error bit.
J=min (N
0, N
1) formula 4
Wherein, N
0Be the number of " 0 " bit in this bit repeated encoding, N
1Number for " 1 " bit in this bit repeated encoding.
Step S220: calculate bit error probability p
m, p
m=J/N, wherein J is for measuring the error bit number of repeated encoding, and N is the number of times of this bit repeated encoding;
Step S230: calculate the BER measured value
Because the randomness of bit mistake can adopt forgetting factor to p
mCarry out smoothly obtaining BER measured value: BER (n)=λ p
m(n-1)+(1-λ) p
m(n).
Step S240: according to
Calculate the block error rate BLER of current t bit, wherein, p
mBe the bit error probability that step a2 calculates, N is the repeated encoding number of times of current t bit, and M can be that system preestablishes maximum error bit number.
Step S250: can calculate the block error rate BLER of default several bits according to the method described above, obtain the average Block Error Rate of those bits.
Step S260: if average BLER is greater than the p of system requirements
e, then reduce expectation bit error rate value, otherwise improve expectation bit error rate value.
Expecting that each time the bit error rate value is to adjust on the basis of last time expectation bit error rate value, expect that the bit error rate value can be to preestablish for the first time, also can be the expectation bit error rate value that control obtains with reference to closed power.
Each step-length that reduces or improve expectation bit error rate value is 1/N, and N is the repeated encoding number of times of a bit, and expectation bit error rate value must be between 0-0.5.
Step S270: if the expectation bit error rate p that the BER measured value calculates greater than step S260
t, then produce the command word of last adjusting power and be sent to transmitting terminal, otherwise produce the command word of following adjusting power and be sent to transmitting terminal by backward channel by backward channel.The power of the signal that transmitting terminal correspondingly will send according to this step-length adjustment after receiving power control command word next time.
By said method the power of the physical channel of transmission binary bits repeated encoding is controlled, can not only reduce interference to other channel, and can make receiving terminal accurately receive those binary bits information, simultaneously, this method is applicable to that the physical channel that needs in the mobile communication system transmission binary interactive channel bit carries out the occasion that power is controlled.
Ascending control channel in the HSDPA system (HS-SICH channel) carries out user CQI and ACK/NACK reports, for accurately reflection link-quality and ACK/NACK information, and the accuracy that should have relatively high expectations to this channel.The information that the HS-SICH channel carries:
Recommended?Modulation?Format(RMF)(1bit)。Be used for modulation system, 0 corresponding QPSK, 1 corresponding 16QAM to Node B indication recommendation.
Recommended?Transport-block?size(RTBS)(6bits)。Be used for transmission block size to Node B indication recommendation.
Hybrid-ARQ?information?ACK/NACK(1bit)。Be used to indicate transmission block whether to be correctly decoded, 1 expression ACK, 0 is NACK.
And in order to improve the reliability of Channel Transmission, ACK/NACK adopts 36 repeated encodings, and RMF adopts 16 repeated encodings.From the above, the HS-SICH Channel Transmission is the physical channel of binary reduplicate information bit.And, carry the TPC time slot format with the HS-SCCH channel support of HS-SICH channel pairing, that is to say that in the power control process of HS-SICH channel, the HS-SCCH channel can be as the backward channel of the command word that sends rise or following adjusting power.
System can carry out closed power control to the HS-SICH channel according to above-mentioned Fig. 1 disclosed method after the minimum accuracy of determining ACK/NACK or RMF requires (being the probability of miscarriage of justice of system requirements).Can carry out closed loop and exterior ring power control to the HS-SICH channel according to Fig. 2 disclosed method, improve the accuracy of HS-SICH channel power control.
More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop in protection scope of the present invention.
Claims (7)
1. Poewr control method that transmits the physical channel of binary reduplicate information bit, it is characterized in that, comprise: the bit error rate that obtains expectation according to the probability of miscarriage of justice of the described physical channel of system requirements, if the bit error rate BER of actual measurement is greater than the bit error rate of expectation, then raise the transmitted power of transmitting terminal, otherwise, then reduce the transmitted power of transmitting terminal;
Wherein, the bit error rate BER of actual measurement obtains in the following manner:
B1: receiving terminal receives binary reduplicate information bit, adds up in the repeated encoding of mutually same bit 0 and 1 number, therefrom selects the number that wherein number is few to count J as error bit, and N is the number of times of this bit repeated encoding;
B2: calculate bit error probability p
m, p
m=J/N;
B3: according to bit error probability p
mCalculate bit error rate BER measured value.
2. the Poewr control method of the physical channel of transmission binary reduplicate information bit as claimed in claim 1 is characterized in that, the bit error rate that obtains expectation according to the probability of miscarriage of justice of the described physical channel of system requirements comprises:
Utilize inequality
The minimum value that calculates p is the bit error rate of expectation, wherein, and p
eBe the probability of miscarriage of justice of the described physical channel of system requirements, described N is the number of times of this bit repeated encoding, and M is that system preestablishes maximum error bit number.
3. the Poewr control method of the physical channel of transmission binary reduplicate information bit as claimed in claim 1 or 2 is characterized in that, the bit error rate that obtains expectation according to the probability of miscarriage of justice of the described physical channel of system requirements comprises:
A1: receiving terminal receives binary reduplicate information bit, adds up in the repeated encoding of mutually same bit 0 and 1 number, therefrom selects the number that wherein number is few to count J as error bit;
A2: calculate bit error probability p
m, p
m=J/N;
A3: according to
Calculate the block error rate BLER of current t bit, wherein, p
mBe the bit error probability that step a2 calculates, N is the repeated encoding number of times of current t bit, and M is that system preestablishes maximum error bit number;
A4: calculate the block error rate BLER of several bits, obtain the average Block Error Rate of those bits;
A5: if average block error rate BLER is greater than the p of system requirements
e, then reduce expectation bit error rate value, otherwise improve expectation bit error rate value.
4. the Poewr control method of the physical channel of transmission binary reduplicate information bit as claimed in claim 3 is characterized in that, each step-length that reduces or improve expectation bit error rate value is 1/N among the step a5, and N is the repeated encoding number of times of this bit.
5. the Poewr control method of the physical channel of transmission binary reduplicate information bit as claimed in claim 1 is characterized in that, step b3 is by smooth manner BER (x)=λ p
m(x-1)+(1-λ) p
m(x) obtain bit error rate BER, wherein, λ is a smoothing factor, p
m(x) error probability of measuring for this bit, p
m(x-1) be the error probability that last bit is measured.
6. the Poewr control method of the physical channel of transmission binary interactive channel bit as claimed in claim 1 is characterized in that, the bit error probability p that bit error rate BER measured value obtains for step b2 among the step b3
m
7. the Poewr control method of the physical channel of transmission binary reduplicate information bit as claimed in claim 2, it is characterized in that, described physical channel is the ascending control channel in the high-speed downlink packet access HSDPA system, and the backward channel that is used to transmit control is a down control channel.
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| CN106060918B (en) * | 2016-06-08 | 2020-06-26 | 上海华为技术有限公司 | Power control method and base station |
| CN108540416A (en) * | 2018-03-21 | 2018-09-14 | 中国人民解放军国防科技大学 | Cognitive radio-based C/Ku frequency band NC-OFDM satellite communication method |
| CN114666247B (en) * | 2022-03-15 | 2023-09-08 | 西安电子科技大学广州研究院 | Design performance evaluation method and system of MPSoCNoC communication architecture |
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| WO2002082666A2 (en) * | 2001-03-28 | 2002-10-17 | Nokia Corporation | Transmissions in a communication system |
| CN1437415A (en) * | 2002-02-08 | 2003-08-20 | 华为技术有限公司 | Power control method of upstream control channel in soft switching state in high speed access system |
| WO2005062490A1 (en) * | 2003-12-22 | 2005-07-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Power control for high-speed packet data transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002082666A2 (en) * | 2001-03-28 | 2002-10-17 | Nokia Corporation | Transmissions in a communication system |
| CN1437415A (en) * | 2002-02-08 | 2003-08-20 | 华为技术有限公司 | Power control method of upstream control channel in soft switching state in high speed access system |
| WO2005062490A1 (en) * | 2003-12-22 | 2005-07-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Power control for high-speed packet data transmission |
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